diff options
Diffstat (limited to 'drivers/platform/chrome')
| -rw-r--r-- | drivers/platform/chrome/Kconfig | 114 | ||||
| -rw-r--r-- | drivers/platform/chrome/Makefile | 15 | ||||
| -rw-r--r-- | drivers/platform/chrome/chromeos_laptop.c | 940 | ||||
| -rw-r--r-- | drivers/platform/chrome/chromeos_pstore.c | 142 | ||||
| -rw-r--r-- | drivers/platform/chrome/chromeos_tbmc.c | 119 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_debugfs.c | 492 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_i2c.c | 386 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_lightbar.c | 619 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_lpc.c | 484 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_lpc_mec.c | 140 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_lpc_reg.c | 133 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_proto.c | 658 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_spi.c | 743 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_sysfs.c | 359 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_ec_vbc.c | 135 | ||||
| -rw-r--r-- | drivers/platform/chrome/cros_kbd_led_backlight.c | 122 |
16 files changed, 5601 insertions, 0 deletions
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig new file mode 100644 index 000000000..16b161595 --- /dev/null +++ b/drivers/platform/chrome/Kconfig @@ -0,0 +1,114 @@ +# +# Platform support for Chrome OS hardware (Chromebooks and Chromeboxes) +# + +menuconfig CHROME_PLATFORMS + bool "Platform support for Chrome hardware" + depends on X86 || ARM || ARM64 || COMPILE_TEST + ---help--- + Say Y here to get to see options for platform support for + various Chromebooks and Chromeboxes. This option alone does + not add any kernel code. + + If you say N, all options in this submenu will be skipped and disabled. + +if CHROME_PLATFORMS + +config CHROMEOS_LAPTOP + tristate "Chrome OS Laptop" + depends on I2C && DMI && X86 + ---help--- + This driver instantiates i2c and smbus devices such as + light sensors and touchpads. + + If you have a supported Chromebook, choose Y or M here. + The module will be called chromeos_laptop. + +config CHROMEOS_PSTORE + tristate "Chrome OS pstore support" + depends on X86 + ---help--- + This module instantiates the persistent storage on x86 ChromeOS + devices. It can be used to store away console logs and crash + information across reboots. + + The range of memory used is 0xf00000-0x1000000, traditionally + the memory used to back VGA controller memory. + + If you have a supported Chromebook, choose Y or M here. + The module will be called chromeos_pstore. + +config CHROMEOS_TBMC + tristate "ChromeOS Tablet Switch Controller" + depends on ACPI + depends on INPUT + help + This option adds a driver for the tablet switch on + select Chrome OS systems. + + To compile this driver as a module, choose M here: the + module will be called chromeos_tbmc. + +config CROS_EC_CTL + tristate + +config CROS_EC_I2C + tristate "ChromeOS Embedded Controller (I2C)" + depends on MFD_CROS_EC && I2C + + help + If you say Y here, you get support for talking to the ChromeOS + EC through an I2C bus. This uses a simple byte-level protocol with + a checksum. Failing accesses will be retried three times to + improve reliability. + +config CROS_EC_SPI + tristate "ChromeOS Embedded Controller (SPI)" + depends on MFD_CROS_EC && SPI + + ---help--- + If you say Y here, you get support for talking to the ChromeOS EC + through a SPI bus, using a byte-level protocol. Since the EC's + response time cannot be guaranteed, we support ignoring + 'pre-amble' bytes before the response actually starts. + +config CROS_EC_LPC + tristate "ChromeOS Embedded Controller (LPC)" + depends on MFD_CROS_EC && ACPI && (X86 || COMPILE_TEST) + help + If you say Y here, you get support for talking to the ChromeOS EC + over an LPC bus. This uses a simple byte-level protocol with a + checksum. This is used for userspace access only. The kernel + typically has its own communication methods. + + To compile this driver as a module, choose M here: the + module will be called cros_ec_lpc. + +config CROS_EC_LPC_MEC + bool "ChromeOS Embedded Controller LPC Microchip EC (MEC) variant" + depends on CROS_EC_LPC + default n + help + If you say Y here, a variant LPC protocol for the Microchip EC + will be used. Note that this variant is not backward compatible + with non-Microchip ECs. + + If you have a ChromeOS Embedded Controller Microchip EC variant + choose Y here. + +config CROS_EC_PROTO + bool + help + ChromeOS EC communication protocol helpers. + +config CROS_KBD_LED_BACKLIGHT + tristate "Backlight LED support for Chrome OS keyboards" + depends on LEDS_CLASS && ACPI + help + This option enables support for the keyboard backlight LEDs on + select Chrome OS systems. + + To compile this driver as a module, choose M here: the + module will be called cros_kbd_led_backlight. + +endif # CHROMEOS_PLATFORMS diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile new file mode 100644 index 000000000..cd591bf87 --- /dev/null +++ b/drivers/platform/chrome/Makefile @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o +obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o +obj-$(CONFIG_CHROMEOS_TBMC) += chromeos_tbmc.o +cros_ec_ctl-objs := cros_ec_sysfs.o cros_ec_lightbar.o \ + cros_ec_vbc.o cros_ec_debugfs.o +obj-$(CONFIG_CROS_EC_CTL) += cros_ec_ctl.o +obj-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o +obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o +cros_ec_lpcs-objs := cros_ec_lpc.o cros_ec_lpc_reg.o +cros_ec_lpcs-$(CONFIG_CROS_EC_LPC_MEC) += cros_ec_lpc_mec.o +obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpcs.o +obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o +obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT) += cros_kbd_led_backlight.o diff --git a/drivers/platform/chrome/chromeos_laptop.c b/drivers/platform/chrome/chromeos_laptop.c new file mode 100644 index 000000000..24326eecd --- /dev/null +++ b/drivers/platform/chrome/chromeos_laptop.c @@ -0,0 +1,940 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Driver to instantiate Chromebook i2c/smbus devices. +// +// Copyright (C) 2012 Google, Inc. +// Author: Benson Leung <bleung@chromium.org> + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/acpi.h> +#include <linux/dmi.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/property.h> + +#define ATMEL_TP_I2C_ADDR 0x4b +#define ATMEL_TP_I2C_BL_ADDR 0x25 +#define ATMEL_TS_I2C_ADDR 0x4a +#define ATMEL_TS_I2C_BL_ADDR 0x26 +#define CYAPA_TP_I2C_ADDR 0x67 +#define ELAN_TP_I2C_ADDR 0x15 +#define ISL_ALS_I2C_ADDR 0x44 +#define TAOS_ALS_I2C_ADDR 0x29 + +static const char *i2c_adapter_names[] = { + "SMBus I801 adapter", + "i915 gmbus vga", + "i915 gmbus panel", + "Synopsys DesignWare I2C adapter", +}; + +/* Keep this enum consistent with i2c_adapter_names */ +enum i2c_adapter_type { + I2C_ADAPTER_SMBUS = 0, + I2C_ADAPTER_VGADDC, + I2C_ADAPTER_PANEL, + I2C_ADAPTER_DESIGNWARE, +}; + +struct i2c_peripheral { + struct i2c_board_info board_info; + unsigned short alt_addr; + + const char *dmi_name; + unsigned long irqflags; + struct resource irq_resource; + + enum i2c_adapter_type type; + u32 pci_devid; + + struct i2c_client *client; +}; + +struct acpi_peripheral { + char hid[ACPI_ID_LEN]; + const struct property_entry *properties; +}; + +struct chromeos_laptop { + /* + * Note that we can't mark this pointer as const because + * i2c_new_probed_device() changes passed in I2C board info, so. + */ + struct i2c_peripheral *i2c_peripherals; + unsigned int num_i2c_peripherals; + + const struct acpi_peripheral *acpi_peripherals; + unsigned int num_acpi_peripherals; +}; + +static const struct chromeos_laptop *cros_laptop; + +static struct i2c_client * +chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter, + struct i2c_board_info *info, + unsigned short alt_addr) +{ + const unsigned short addr_list[] = { info->addr, I2C_CLIENT_END }; + struct i2c_client *client; + + /* + * Add the i2c device. If we can't detect it at the primary + * address we scan secondary addresses. In any case the client + * structure gets assigned primary address. + */ + client = i2c_new_probed_device(adapter, info, addr_list, NULL); + if (!client && alt_addr) { + struct i2c_board_info dummy_info = { + I2C_BOARD_INFO("dummy", info->addr), + }; + const unsigned short alt_addr_list[] = { + alt_addr, I2C_CLIENT_END + }; + struct i2c_client *dummy; + + dummy = i2c_new_probed_device(adapter, &dummy_info, + alt_addr_list, NULL); + if (dummy) { + pr_debug("%d-%02x is probed at %02x\n", + adapter->nr, info->addr, dummy->addr); + i2c_unregister_device(dummy); + client = i2c_new_device(adapter, info); + } + } + + if (!client) + pr_debug("failed to register device %d-%02x\n", + adapter->nr, info->addr); + else + pr_debug("added i2c device %d-%02x\n", + adapter->nr, info->addr); + + return client; +} + +static bool chromeos_laptop_match_adapter_devid(struct device *dev, u32 devid) +{ + struct pci_dev *pdev; + + if (!dev_is_pci(dev)) + return false; + + pdev = to_pci_dev(dev); + return devid == PCI_DEVID(pdev->bus->number, pdev->devfn); +} + +static void chromeos_laptop_check_adapter(struct i2c_adapter *adapter) +{ + struct i2c_peripheral *i2c_dev; + int i; + + for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) { + i2c_dev = &cros_laptop->i2c_peripherals[i]; + + /* Skip devices already created */ + if (i2c_dev->client) + continue; + + if (strncmp(adapter->name, i2c_adapter_names[i2c_dev->type], + strlen(i2c_adapter_names[i2c_dev->type]))) + continue; + + if (i2c_dev->pci_devid && + !chromeos_laptop_match_adapter_devid(adapter->dev.parent, + i2c_dev->pci_devid)) { + continue; + } + + i2c_dev->client = + chromes_laptop_instantiate_i2c_device(adapter, + &i2c_dev->board_info, + i2c_dev->alt_addr); + } +} + +static bool chromeos_laptop_adjust_client(struct i2c_client *client) +{ + const struct acpi_peripheral *acpi_dev; + struct acpi_device_id acpi_ids[2] = { }; + int i; + int error; + + if (!has_acpi_companion(&client->dev)) + return false; + + for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) { + acpi_dev = &cros_laptop->acpi_peripherals[i]; + + memcpy(acpi_ids[0].id, acpi_dev->hid, ACPI_ID_LEN); + + if (acpi_match_device(acpi_ids, &client->dev)) { + error = device_add_properties(&client->dev, + acpi_dev->properties); + if (error) { + dev_err(&client->dev, + "failed to add properties: %d\n", + error); + break; + } + + return true; + } + } + + return false; +} + +static void chromeos_laptop_detach_i2c_client(struct i2c_client *client) +{ + struct i2c_peripheral *i2c_dev; + int i; + + for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) { + i2c_dev = &cros_laptop->i2c_peripherals[i]; + + if (i2c_dev->client == client) + i2c_dev->client = NULL; + } +} + +static int chromeos_laptop_i2c_notifier_call(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + + switch (action) { + case BUS_NOTIFY_ADD_DEVICE: + if (dev->type == &i2c_adapter_type) + chromeos_laptop_check_adapter(to_i2c_adapter(dev)); + else if (dev->type == &i2c_client_type) + chromeos_laptop_adjust_client(to_i2c_client(dev)); + break; + + case BUS_NOTIFY_REMOVED_DEVICE: + if (dev->type == &i2c_client_type) + chromeos_laptop_detach_i2c_client(to_i2c_client(dev)); + break; + } + + return 0; +} + +static struct notifier_block chromeos_laptop_i2c_notifier = { + .notifier_call = chromeos_laptop_i2c_notifier_call, +}; + +#define DECLARE_CROS_LAPTOP(_name) \ +static const struct chromeos_laptop _name __initconst = { \ + .i2c_peripherals = _name##_peripherals, \ + .num_i2c_peripherals = ARRAY_SIZE(_name##_peripherals), \ +} + +#define DECLARE_ACPI_CROS_LAPTOP(_name) \ +static const struct chromeos_laptop _name __initconst = { \ + .acpi_peripherals = _name##_peripherals, \ + .num_acpi_peripherals = ARRAY_SIZE(_name##_peripherals), \ +} + +static struct i2c_peripheral samsung_series_5_550_peripherals[] __initdata = { + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_SMBUS, + }, + /* Light Sensor. */ + { + .board_info = { + I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR), + }, + .dmi_name = "lightsensor", + .type = I2C_ADAPTER_SMBUS, + }, +}; +DECLARE_CROS_LAPTOP(samsung_series_5_550); + +static struct i2c_peripheral samsung_series_5_peripherals[] __initdata = { + /* Light Sensor. */ + { + .board_info = { + I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR), + }, + .type = I2C_ADAPTER_SMBUS, + }, +}; +DECLARE_CROS_LAPTOP(samsung_series_5); + +static const int chromebook_pixel_tp_keys[] __initconst = { + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + BTN_LEFT +}; + +static const struct property_entry +chromebook_pixel_trackpad_props[] __initconst = { + PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"), + PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", chromebook_pixel_tp_keys), + { } +}; + +static const struct property_entry +chromebook_atmel_touchscreen_props[] __initconst = { + PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"), + { } +}; + +static struct i2c_peripheral chromebook_pixel_peripherals[] __initdata = { + /* Touch Screen. */ + { + .board_info = { + I2C_BOARD_INFO("atmel_mxt_ts", + ATMEL_TS_I2C_ADDR), + .properties = + chromebook_atmel_touchscreen_props, + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "touchscreen", + .irqflags = IRQF_TRIGGER_FALLING, + .type = I2C_ADAPTER_PANEL, + .alt_addr = ATMEL_TS_I2C_BL_ADDR, + }, + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("atmel_mxt_tp", + ATMEL_TP_I2C_ADDR), + .properties = + chromebook_pixel_trackpad_props, + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .irqflags = IRQF_TRIGGER_FALLING, + .type = I2C_ADAPTER_VGADDC, + .alt_addr = ATMEL_TP_I2C_BL_ADDR, + }, + /* Light Sensor. */ + { + .board_info = { + I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR), + }, + .dmi_name = "lightsensor", + .type = I2C_ADAPTER_PANEL, + }, +}; +DECLARE_CROS_LAPTOP(chromebook_pixel); + +static struct i2c_peripheral hp_chromebook_14_peripherals[] __initdata = { + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_DESIGNWARE, + }, +}; +DECLARE_CROS_LAPTOP(hp_chromebook_14); + +static struct i2c_peripheral dell_chromebook_11_peripherals[] __initdata = { + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_DESIGNWARE, + }, + /* Elan Touchpad option. */ + { + .board_info = { + I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_DESIGNWARE, + }, +}; +DECLARE_CROS_LAPTOP(dell_chromebook_11); + +static struct i2c_peripheral toshiba_cb35_peripherals[] __initdata = { + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_DESIGNWARE, + }, +}; +DECLARE_CROS_LAPTOP(toshiba_cb35); + +static struct i2c_peripheral acer_c7_chromebook_peripherals[] __initdata = { + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_SMBUS, + }, +}; +DECLARE_CROS_LAPTOP(acer_c7_chromebook); + +static struct i2c_peripheral acer_ac700_peripherals[] __initdata = { + /* Light Sensor. */ + { + .board_info = { + I2C_BOARD_INFO("tsl2583", TAOS_ALS_I2C_ADDR), + }, + .type = I2C_ADAPTER_SMBUS, + }, +}; +DECLARE_CROS_LAPTOP(acer_ac700); + +static struct i2c_peripheral acer_c720_peripherals[] __initdata = { + /* Touchscreen. */ + { + .board_info = { + I2C_BOARD_INFO("atmel_mxt_ts", + ATMEL_TS_I2C_ADDR), + .properties = + chromebook_atmel_touchscreen_props, + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "touchscreen", + .irqflags = IRQF_TRIGGER_FALLING, + .type = I2C_ADAPTER_DESIGNWARE, + .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)), + .alt_addr = ATMEL_TS_I2C_BL_ADDR, + }, + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_DESIGNWARE, + .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)), + }, + /* Elan Touchpad option. */ + { + .board_info = { + I2C_BOARD_INFO("elan_i2c", ELAN_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_DESIGNWARE, + .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x1)), + }, + /* Light Sensor. */ + { + .board_info = { + I2C_BOARD_INFO("isl29018", ISL_ALS_I2C_ADDR), + }, + .dmi_name = "lightsensor", + .type = I2C_ADAPTER_DESIGNWARE, + .pci_devid = PCI_DEVID(0, PCI_DEVFN(0x15, 0x2)), + }, +}; +DECLARE_CROS_LAPTOP(acer_c720); + +static struct i2c_peripheral +hp_pavilion_14_chromebook_peripherals[] __initdata = { + /* Touchpad. */ + { + .board_info = { + I2C_BOARD_INFO("cyapa", CYAPA_TP_I2C_ADDR), + .flags = I2C_CLIENT_WAKE, + }, + .dmi_name = "trackpad", + .type = I2C_ADAPTER_SMBUS, + }, +}; +DECLARE_CROS_LAPTOP(hp_pavilion_14_chromebook); + +static struct i2c_peripheral cr48_peripherals[] __initdata = { + /* Light Sensor. */ + { + .board_info = { + I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR), + }, + .type = I2C_ADAPTER_SMBUS, + }, +}; +DECLARE_CROS_LAPTOP(cr48); + +static const u32 samus_touchpad_buttons[] __initconst = { + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + BTN_LEFT +}; + +static const struct property_entry samus_trackpad_props[] __initconst = { + PROPERTY_ENTRY_STRING("compatible", "atmel,maxtouch"), + PROPERTY_ENTRY_U32_ARRAY("linux,gpio-keymap", samus_touchpad_buttons), + { } +}; + +static struct acpi_peripheral samus_peripherals[] __initdata = { + /* Touchpad */ + { + .hid = "ATML0000", + .properties = samus_trackpad_props, + }, + /* Touchsceen */ + { + .hid = "ATML0001", + .properties = chromebook_atmel_touchscreen_props, + }, +}; +DECLARE_ACPI_CROS_LAPTOP(samus); + +static struct acpi_peripheral generic_atmel_peripherals[] __initdata = { + /* Touchpad */ + { + .hid = "ATML0000", + .properties = chromebook_pixel_trackpad_props, + }, + /* Touchsceen */ + { + .hid = "ATML0001", + .properties = chromebook_atmel_touchscreen_props, + }, +}; +DECLARE_ACPI_CROS_LAPTOP(generic_atmel); + +static const struct dmi_system_id chromeos_laptop_dmi_table[] __initconst = { + { + .ident = "Samsung Series 5 550", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"), + DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"), + }, + .driver_data = (void *)&samsung_series_5_550, + }, + { + .ident = "Samsung Series 5", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "Alex"), + }, + .driver_data = (void *)&samsung_series_5, + }, + { + .ident = "Chromebook Pixel", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Link"), + }, + .driver_data = (void *)&chromebook_pixel, + }, + { + .ident = "Wolf", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_PRODUCT_NAME, "Wolf"), + }, + .driver_data = (void *)&dell_chromebook_11, + }, + { + .ident = "HP Chromebook 14", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_PRODUCT_NAME, "Falco"), + }, + .driver_data = (void *)&hp_chromebook_14, + }, + { + .ident = "Toshiba CB35", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_PRODUCT_NAME, "Leon"), + }, + .driver_data = (void *)&toshiba_cb35, + }, + { + .ident = "Acer C7 Chromebook", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "Parrot"), + }, + .driver_data = (void *)&acer_c7_chromebook, + }, + { + .ident = "Acer AC700", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), + }, + .driver_data = (void *)&acer_ac700, + }, + { + .ident = "Acer C720", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"), + }, + .driver_data = (void *)&acer_c720, + }, + { + .ident = "HP Pavilion 14 Chromebook", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "Butterfly"), + }, + .driver_data = (void *)&hp_pavilion_14_chromebook, + }, + { + .ident = "Cr-48", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "Mario"), + }, + .driver_data = (void *)&cr48, + }, + /* Devices with peripherals incompletely described in ACPI */ + { + .ident = "Chromebook Pro", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Google"), + DMI_MATCH(DMI_PRODUCT_NAME, "Caroline"), + }, + .driver_data = (void *)&samus, + }, + { + .ident = "Google Pixel 2 (2015)", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Samus"), + }, + .driver_data = (void *)&samus, + }, + { + .ident = "Samsung Chromebook 3", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Celes"), + }, + .driver_data = (void *)&samus, + }, + { + /* + * Other Chromebooks with Atmel touch controllers: + * - Winky (touchpad) + * - Clapper, Expresso, Rambi, Glimmer (touchscreen) + */ + .ident = "Other Chromebook", + .matches = { + /* + * This will match all Google devices, not only devices + * with Atmel, but we will validate that the device + * actually has matching peripherals. + */ + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + }, + .driver_data = (void *)&generic_atmel, + }, + { } +}; +MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table); + +static int __init chromeos_laptop_scan_peripherals(struct device *dev, void *data) +{ + int error; + + if (dev->type == &i2c_adapter_type) { + chromeos_laptop_check_adapter(to_i2c_adapter(dev)); + } else if (dev->type == &i2c_client_type) { + if (chromeos_laptop_adjust_client(to_i2c_client(dev))) { + /* + * Now that we have needed properties re-trigger + * driver probe in case driver was initialized + * earlier and probe failed. + */ + error = device_attach(dev); + if (error < 0) + dev_warn(dev, + "%s: device_attach() failed: %d\n", + __func__, error); + } + } + + return 0; +} + +static int __init chromeos_laptop_get_irq_from_dmi(const char *dmi_name) +{ + const struct dmi_device *dmi_dev; + const struct dmi_dev_onboard *dev_data; + + dmi_dev = dmi_find_device(DMI_DEV_TYPE_DEV_ONBOARD, dmi_name, NULL); + if (!dmi_dev) { + pr_err("failed to find DMI device '%s'\n", dmi_name); + return -ENOENT; + } + + dev_data = dmi_dev->device_data; + if (!dev_data) { + pr_err("failed to get data from DMI for '%s'\n", dmi_name); + return -EINVAL; + } + + return dev_data->instance; +} + +static int __init chromeos_laptop_setup_irq(struct i2c_peripheral *i2c_dev) +{ + int irq; + + if (i2c_dev->dmi_name) { + irq = chromeos_laptop_get_irq_from_dmi(i2c_dev->dmi_name); + if (irq < 0) + return irq; + + i2c_dev->irq_resource = (struct resource) + DEFINE_RES_NAMED(irq, 1, NULL, + IORESOURCE_IRQ | i2c_dev->irqflags); + i2c_dev->board_info.resources = &i2c_dev->irq_resource; + i2c_dev->board_info.num_resources = 1; + } + + return 0; +} + +static int __init +chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop, + const struct chromeos_laptop *src) +{ + struct i2c_peripheral *i2c_dev; + struct i2c_board_info *info; + int i; + int error; + + if (!src->num_i2c_peripherals) + return 0; + + cros_laptop->i2c_peripherals = kmemdup(src->i2c_peripherals, + src->num_i2c_peripherals * + sizeof(*src->i2c_peripherals), + GFP_KERNEL); + if (!cros_laptop->i2c_peripherals) + return -ENOMEM; + + cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals; + + for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) { + i2c_dev = &cros_laptop->i2c_peripherals[i]; + info = &i2c_dev->board_info; + + error = chromeos_laptop_setup_irq(i2c_dev); + if (error) + goto err_out; + + /* We need to deep-copy properties */ + if (info->properties) { + info->properties = + property_entries_dup(info->properties); + if (IS_ERR(info->properties)) { + error = PTR_ERR(info->properties); + goto err_out; + } + } + } + + return 0; + +err_out: + while (--i >= 0) { + i2c_dev = &cros_laptop->i2c_peripherals[i]; + info = &i2c_dev->board_info; + if (info->properties) + property_entries_free(info->properties); + } + kfree(cros_laptop->i2c_peripherals); + return error; +} + +static int __init +chromeos_laptop_prepare_acpi_peripherals(struct chromeos_laptop *cros_laptop, + const struct chromeos_laptop *src) +{ + struct acpi_peripheral *acpi_peripherals; + struct acpi_peripheral *acpi_dev; + const struct acpi_peripheral *src_dev; + int n_peripherals = 0; + int i; + int error; + + for (i = 0; i < src->num_acpi_peripherals; i++) { + if (acpi_dev_present(src->acpi_peripherals[i].hid, NULL, -1)) + n_peripherals++; + } + + if (!n_peripherals) + return 0; + + acpi_peripherals = kcalloc(n_peripherals, + sizeof(*src->acpi_peripherals), + GFP_KERNEL); + if (!acpi_peripherals) + return -ENOMEM; + + acpi_dev = acpi_peripherals; + for (i = 0; i < src->num_acpi_peripherals; i++) { + src_dev = &src->acpi_peripherals[i]; + if (!acpi_dev_present(src_dev->hid, NULL, -1)) + continue; + + *acpi_dev = *src_dev; + + /* We need to deep-copy properties */ + if (src_dev->properties) { + acpi_dev->properties = + property_entries_dup(src_dev->properties); + if (IS_ERR(acpi_dev->properties)) { + error = PTR_ERR(acpi_dev->properties); + goto err_out; + } + } + + acpi_dev++; + } + + cros_laptop->acpi_peripherals = acpi_peripherals; + cros_laptop->num_acpi_peripherals = n_peripherals; + + return 0; + +err_out: + while (--i >= 0) { + acpi_dev = &acpi_peripherals[i]; + if (acpi_dev->properties) + property_entries_free(acpi_dev->properties); + } + + kfree(acpi_peripherals); + return error; +} + +static void chromeos_laptop_destroy(const struct chromeos_laptop *cros_laptop) +{ + const struct acpi_peripheral *acpi_dev; + struct i2c_peripheral *i2c_dev; + struct i2c_board_info *info; + int i; + + for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) { + i2c_dev = &cros_laptop->i2c_peripherals[i]; + info = &i2c_dev->board_info; + + if (i2c_dev->client) + i2c_unregister_device(i2c_dev->client); + + if (info->properties) + property_entries_free(info->properties); + } + + for (i = 0; i < cros_laptop->num_acpi_peripherals; i++) { + acpi_dev = &cros_laptop->acpi_peripherals[i]; + + if (acpi_dev->properties) + property_entries_free(acpi_dev->properties); + } + + kfree(cros_laptop->i2c_peripherals); + kfree(cros_laptop->acpi_peripherals); + kfree(cros_laptop); +} + +static struct chromeos_laptop * __init +chromeos_laptop_prepare(const struct chromeos_laptop *src) +{ + struct chromeos_laptop *cros_laptop; + int error; + + cros_laptop = kzalloc(sizeof(*cros_laptop), GFP_KERNEL); + if (!cros_laptop) + return ERR_PTR(-ENOMEM); + + error = chromeos_laptop_prepare_i2c_peripherals(cros_laptop, src); + if (!error) + error = chromeos_laptop_prepare_acpi_peripherals(cros_laptop, + src); + + if (error) { + chromeos_laptop_destroy(cros_laptop); + return ERR_PTR(error); + } + + return cros_laptop; +} + +static int __init chromeos_laptop_init(void) +{ + const struct dmi_system_id *dmi_id; + int error; + + dmi_id = dmi_first_match(chromeos_laptop_dmi_table); + if (!dmi_id) { + pr_debug("unsupported system\n"); + return -ENODEV; + } + + pr_debug("DMI Matched %s\n", dmi_id->ident); + + cros_laptop = chromeos_laptop_prepare((void *)dmi_id->driver_data); + if (IS_ERR(cros_laptop)) + return PTR_ERR(cros_laptop); + + if (!cros_laptop->num_i2c_peripherals && + !cros_laptop->num_acpi_peripherals) { + pr_debug("no relevant devices detected\n"); + error = -ENODEV; + goto err_destroy_cros_laptop; + } + + error = bus_register_notifier(&i2c_bus_type, + &chromeos_laptop_i2c_notifier); + if (error) { + pr_err("failed to register i2c bus notifier: %d\n", + error); + goto err_destroy_cros_laptop; + } + + /* + * Scan adapters that have been registered and clients that have + * been created before we installed the notifier to make sure + * we do not miss any devices. + */ + i2c_for_each_dev(NULL, chromeos_laptop_scan_peripherals); + + return 0; + +err_destroy_cros_laptop: + chromeos_laptop_destroy(cros_laptop); + return error; +} + +static void __exit chromeos_laptop_exit(void) +{ + bus_unregister_notifier(&i2c_bus_type, &chromeos_laptop_i2c_notifier); + chromeos_laptop_destroy(cros_laptop); +} + +module_init(chromeos_laptop_init); +module_exit(chromeos_laptop_exit); + +MODULE_DESCRIPTION("Chrome OS Laptop driver"); +MODULE_AUTHOR("Benson Leung <bleung@chromium.org>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/platform/chrome/chromeos_pstore.c b/drivers/platform/chrome/chromeos_pstore.c new file mode 100644 index 000000000..b0693fdec --- /dev/null +++ b/drivers/platform/chrome/chromeos_pstore.c @@ -0,0 +1,142 @@ +/* + * chromeos_pstore.c - Driver to instantiate Chromebook ramoops device + * + * Copyright (C) 2013 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, version 2 of the License. + */ + +#include <linux/acpi.h> +#include <linux/dmi.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pstore_ram.h> + +static const struct dmi_system_id chromeos_pstore_dmi_table[] __initconst = { + { + /* + * Today all Chromebooks/boxes ship with Google_* as version and + * coreboot as bios vendor. No other systems with this + * combination are known to date. + */ + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_BIOS_VERSION, "Google_"), + }, + }, + { + /* x86-alex, the first Samsung Chromebook. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "Alex"), + }, + }, + { + /* x86-mario, the Cr-48 pilot device from Google. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "IEC"), + DMI_MATCH(DMI_PRODUCT_NAME, "Mario"), + }, + }, + { + /* x86-zgb, the first Acer Chromebook. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ACER"), + DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"), + }, + }, + { } +}; +MODULE_DEVICE_TABLE(dmi, chromeos_pstore_dmi_table); + +/* + * On x86 chromebooks/boxes, the firmware will keep the legacy VGA memory + * range untouched across reboots, so we use that to store our pstore + * contents for panic logs, etc. + */ +static struct ramoops_platform_data chromeos_ramoops_data = { + .mem_size = 0x100000, + .mem_address = 0xf00000, + .record_size = 0x40000, + .console_size = 0x20000, + .ftrace_size = 0x20000, + .dump_oops = 1, +}; + +static struct platform_device chromeos_ramoops = { + .name = "ramoops", + .dev = { + .platform_data = &chromeos_ramoops_data, + }, +}; + +#ifdef CONFIG_ACPI +static const struct acpi_device_id cros_ramoops_acpi_match[] = { + { "GOOG9999", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, cros_ramoops_acpi_match); + +static struct platform_driver chromeos_ramoops_acpi = { + .driver = { + .name = "chromeos_pstore", + .acpi_match_table = ACPI_PTR(cros_ramoops_acpi_match), + }, +}; + +static int __init chromeos_probe_acpi(struct platform_device *pdev) +{ + struct resource *res; + resource_size_t len; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENOMEM; + + len = resource_size(res); + if (!res->start || !len) + return -ENOMEM; + + pr_info("chromeos ramoops using acpi device.\n"); + + chromeos_ramoops_data.mem_size = len; + chromeos_ramoops_data.mem_address = res->start; + + return 0; +} + +static bool __init chromeos_check_acpi(void) +{ + if (!platform_driver_probe(&chromeos_ramoops_acpi, chromeos_probe_acpi)) + return true; + return false; +} +#else +static inline bool chromeos_check_acpi(void) { return false; } +#endif + +static int __init chromeos_pstore_init(void) +{ + bool acpi_dev_found; + + /* First check ACPI for non-hardcoded values from firmware. */ + acpi_dev_found = chromeos_check_acpi(); + + if (acpi_dev_found || dmi_check_system(chromeos_pstore_dmi_table)) + return platform_device_register(&chromeos_ramoops); + + return -ENODEV; +} + +static void __exit chromeos_pstore_exit(void) +{ + platform_device_unregister(&chromeos_ramoops); +} + +module_init(chromeos_pstore_init); +module_exit(chromeos_pstore_exit); + +MODULE_DESCRIPTION("Chrome OS pstore module"); +MODULE_LICENSE("GPL"); diff --git a/drivers/platform/chrome/chromeos_tbmc.c b/drivers/platform/chrome/chromeos_tbmc.c new file mode 100644 index 000000000..1e81f8144 --- /dev/null +++ b/drivers/platform/chrome/chromeos_tbmc.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0 +// Driver to detect Tablet Mode for ChromeOS convertible. +// +// Copyright (C) 2017 Google, Inc. +// Author: Gwendal Grignou <gwendal@chromium.org> +// +// On Chromebook using ACPI, this device listens for notification +// from GOOG0006 and issue method TBMC to retrieve the status. +// +// GOOG0006 issues the notification when it receives EC_HOST_EVENT_MODE_CHANGE +// from the EC. +// Method TBMC reads EC_ACPI_MEM_DEVICE_ORIENTATION byte from the shared +// memory region. + +#include <linux/acpi.h> +#include <linux/input.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/printk.h> + +#define DRV_NAME "chromeos_tbmc" +#define ACPI_DRV_NAME "GOOG0006" + +static int chromeos_tbmc_query_switch(struct acpi_device *adev, + struct input_dev *idev) +{ + unsigned long long state; + acpi_status status; + + status = acpi_evaluate_integer(adev->handle, "TBMC", NULL, &state); + if (ACPI_FAILURE(status)) + return -ENODEV; + + /* input layer checks if event is redundant */ + input_report_switch(idev, SW_TABLET_MODE, state); + input_sync(idev); + + return 0; +} + +static __maybe_unused int chromeos_tbmc_resume(struct device *dev) +{ + struct acpi_device *adev = to_acpi_device(dev); + + return chromeos_tbmc_query_switch(adev, adev->driver_data); +} + +static void chromeos_tbmc_notify(struct acpi_device *adev, u32 event) +{ + switch (event) { + case 0x80: + chromeos_tbmc_query_switch(adev, adev->driver_data); + break; + default: + dev_err(&adev->dev, "Unexpected event: 0x%08X\n", event); + } +} + +static int chromeos_tbmc_open(struct input_dev *idev) +{ + struct acpi_device *adev = input_get_drvdata(idev); + + return chromeos_tbmc_query_switch(adev, idev); +} + +static int chromeos_tbmc_add(struct acpi_device *adev) +{ + struct input_dev *idev; + struct device *dev = &adev->dev; + int ret; + + idev = devm_input_allocate_device(dev); + if (!idev) + return -ENOMEM; + + idev->name = "Tablet Mode Switch"; + idev->phys = acpi_device_hid(adev); + + idev->id.bustype = BUS_HOST; + idev->id.version = 1; + idev->id.product = 0; + idev->open = chromeos_tbmc_open; + + input_set_drvdata(idev, adev); + adev->driver_data = idev; + + input_set_capability(idev, EV_SW, SW_TABLET_MODE); + ret = input_register_device(idev); + if (ret) { + dev_err(dev, "cannot register input device\n"); + return ret; + } + return 0; +} + +static const struct acpi_device_id chromeos_tbmc_acpi_device_ids[] = { + { ACPI_DRV_NAME, 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, chromeos_tbmc_acpi_device_ids); + +static const SIMPLE_DEV_PM_OPS(chromeos_tbmc_pm_ops, NULL, + chromeos_tbmc_resume); + +static struct acpi_driver chromeos_tbmc_driver = { + .name = DRV_NAME, + .class = DRV_NAME, + .ids = chromeos_tbmc_acpi_device_ids, + .ops = { + .add = chromeos_tbmc_add, + .notify = chromeos_tbmc_notify, + }, + .drv.pm = &chromeos_tbmc_pm_ops, +}; + +module_acpi_driver(chromeos_tbmc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("ChromeOS ACPI tablet switch driver"); diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c new file mode 100644 index 000000000..c62ee8e61 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_debugfs.c @@ -0,0 +1,492 @@ +/* + * cros_ec_debugfs - debug logs for Chrome OS EC + * + * Copyright 2015 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/circ_buf.h> +#include <linux/debugfs.h> +#include <linux/delay.h> +#include <linux/fs.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/mutex.h> +#include <linux/poll.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/wait.h> + +#define LOG_SHIFT 14 +#define LOG_SIZE (1 << LOG_SHIFT) +#define LOG_POLL_SEC 10 + +#define CIRC_ADD(idx, size, value) (((idx) + (value)) & ((size) - 1)) + +/* struct cros_ec_debugfs - ChromeOS EC debugging information + * + * @ec: EC device this debugfs information belongs to + * @dir: dentry for debugfs files + * @log_buffer: circular buffer for console log information + * @read_msg: preallocated EC command and buffer to read console log + * @log_mutex: mutex to protect circular buffer + * @log_wq: waitqueue for log readers + * @log_poll_work: recurring task to poll EC for new console log data + * @panicinfo_blob: panicinfo debugfs blob + */ +struct cros_ec_debugfs { + struct cros_ec_dev *ec; + struct dentry *dir; + /* EC log */ + struct circ_buf log_buffer; + struct cros_ec_command *read_msg; + struct mutex log_mutex; + wait_queue_head_t log_wq; + struct delayed_work log_poll_work; + /* EC panicinfo */ + struct debugfs_blob_wrapper panicinfo_blob; +}; + +/* + * We need to make sure that the EC log buffer on the UART is large enough, + * so that it is unlikely enough to overlow within LOG_POLL_SEC. + */ +static void cros_ec_console_log_work(struct work_struct *__work) +{ + struct cros_ec_debugfs *debug_info = + container_of(to_delayed_work(__work), + struct cros_ec_debugfs, + log_poll_work); + struct cros_ec_dev *ec = debug_info->ec; + struct circ_buf *cb = &debug_info->log_buffer; + struct cros_ec_command snapshot_msg = { + .command = EC_CMD_CONSOLE_SNAPSHOT + ec->cmd_offset, + }; + + struct ec_params_console_read_v1 *read_params = + (struct ec_params_console_read_v1 *)debug_info->read_msg->data; + uint8_t *ec_buffer = (uint8_t *)debug_info->read_msg->data; + int idx; + int buf_space; + int ret; + + ret = cros_ec_cmd_xfer(ec->ec_dev, &snapshot_msg); + if (ret < 0) { + dev_err(ec->dev, "EC communication failed\n"); + goto resched; + } + if (snapshot_msg.result != EC_RES_SUCCESS) { + dev_err(ec->dev, "EC failed to snapshot the console log\n"); + goto resched; + } + + /* Loop until we have read everything, or there's an error. */ + mutex_lock(&debug_info->log_mutex); + buf_space = CIRC_SPACE(cb->head, cb->tail, LOG_SIZE); + + while (1) { + if (!buf_space) { + dev_info_once(ec->dev, + "Some logs may have been dropped...\n"); + break; + } + + memset(read_params, '\0', sizeof(*read_params)); + read_params->subcmd = CONSOLE_READ_RECENT; + ret = cros_ec_cmd_xfer(ec->ec_dev, debug_info->read_msg); + if (ret < 0) { + dev_err(ec->dev, "EC communication failed\n"); + break; + } + if (debug_info->read_msg->result != EC_RES_SUCCESS) { + dev_err(ec->dev, + "EC failed to read the console log\n"); + break; + } + + /* If the buffer is empty, we're done here. */ + if (ret == 0 || ec_buffer[0] == '\0') + break; + + idx = 0; + while (idx < ret && ec_buffer[idx] != '\0' && buf_space > 0) { + cb->buf[cb->head] = ec_buffer[idx]; + cb->head = CIRC_ADD(cb->head, LOG_SIZE, 1); + idx++; + buf_space--; + } + + wake_up(&debug_info->log_wq); + } + + mutex_unlock(&debug_info->log_mutex); + +resched: + schedule_delayed_work(&debug_info->log_poll_work, + msecs_to_jiffies(LOG_POLL_SEC * 1000)); +} + +static int cros_ec_console_log_open(struct inode *inode, struct file *file) +{ + file->private_data = inode->i_private; + + return nonseekable_open(inode, file); +} + +static ssize_t cros_ec_console_log_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct cros_ec_debugfs *debug_info = file->private_data; + struct circ_buf *cb = &debug_info->log_buffer; + ssize_t ret; + + mutex_lock(&debug_info->log_mutex); + + while (!CIRC_CNT(cb->head, cb->tail, LOG_SIZE)) { + if (file->f_flags & O_NONBLOCK) { + ret = -EAGAIN; + goto error; + } + + mutex_unlock(&debug_info->log_mutex); + + ret = wait_event_interruptible(debug_info->log_wq, + CIRC_CNT(cb->head, cb->tail, LOG_SIZE)); + if (ret < 0) + return ret; + + mutex_lock(&debug_info->log_mutex); + } + + /* Only copy until the end of the circular buffer, and let userspace + * retry to get the rest of the data. + */ + ret = min_t(size_t, CIRC_CNT_TO_END(cb->head, cb->tail, LOG_SIZE), + count); + + if (copy_to_user(buf, cb->buf + cb->tail, ret)) { + ret = -EFAULT; + goto error; + } + + cb->tail = CIRC_ADD(cb->tail, LOG_SIZE, ret); + +error: + mutex_unlock(&debug_info->log_mutex); + return ret; +} + +static __poll_t cros_ec_console_log_poll(struct file *file, + poll_table *wait) +{ + struct cros_ec_debugfs *debug_info = file->private_data; + __poll_t mask = 0; + + poll_wait(file, &debug_info->log_wq, wait); + + mutex_lock(&debug_info->log_mutex); + if (CIRC_CNT(debug_info->log_buffer.head, + debug_info->log_buffer.tail, + LOG_SIZE)) + mask |= EPOLLIN | EPOLLRDNORM; + mutex_unlock(&debug_info->log_mutex); + + return mask; +} + +static int cros_ec_console_log_release(struct inode *inode, struct file *file) +{ + return 0; +} + +static ssize_t cros_ec_pdinfo_read(struct file *file, + char __user *user_buf, + size_t count, + loff_t *ppos) +{ + char read_buf[EC_USB_PD_MAX_PORTS * 40], *p = read_buf; + struct cros_ec_debugfs *debug_info = file->private_data; + struct cros_ec_device *ec_dev = debug_info->ec->ec_dev; + struct { + struct cros_ec_command msg; + union { + struct ec_response_usb_pd_control_v1 resp; + struct ec_params_usb_pd_control params; + }; + } __packed ec_buf; + struct cros_ec_command *msg; + struct ec_response_usb_pd_control_v1 *resp; + struct ec_params_usb_pd_control *params; + int i; + + msg = &ec_buf.msg; + params = (struct ec_params_usb_pd_control *)msg->data; + resp = (struct ec_response_usb_pd_control_v1 *)msg->data; + + msg->command = EC_CMD_USB_PD_CONTROL; + msg->version = 1; + msg->insize = sizeof(*resp); + msg->outsize = sizeof(*params); + + /* + * Read status from all PD ports until failure, typically caused + * by attempting to read status on a port that doesn't exist. + */ + for (i = 0; i < EC_USB_PD_MAX_PORTS; ++i) { + params->port = i; + params->role = 0; + params->mux = 0; + params->swap = 0; + + if (cros_ec_cmd_xfer_status(ec_dev, msg) < 0) + break; + + p += scnprintf(p, sizeof(read_buf) + read_buf - p, + "p%d: %s en:%.2x role:%.2x pol:%.2x\n", i, + resp->state, resp->enabled, resp->role, + resp->polarity); + } + + return simple_read_from_buffer(user_buf, count, ppos, + read_buf, p - read_buf); +} + +const struct file_operations cros_ec_console_log_fops = { + .owner = THIS_MODULE, + .open = cros_ec_console_log_open, + .read = cros_ec_console_log_read, + .llseek = no_llseek, + .poll = cros_ec_console_log_poll, + .release = cros_ec_console_log_release, +}; + +const struct file_operations cros_ec_pdinfo_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = cros_ec_pdinfo_read, + .llseek = default_llseek, +}; + +static int ec_read_version_supported(struct cros_ec_dev *ec) +{ + struct ec_params_get_cmd_versions_v1 *params; + struct ec_response_get_cmd_versions *response; + int ret; + + struct cros_ec_command *msg; + + msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*response)), + GFP_KERNEL); + if (!msg) + return 0; + + msg->command = EC_CMD_GET_CMD_VERSIONS + ec->cmd_offset; + msg->outsize = sizeof(*params); + msg->insize = sizeof(*response); + + params = (struct ec_params_get_cmd_versions_v1 *)msg->data; + params->cmd = EC_CMD_CONSOLE_READ; + response = (struct ec_response_get_cmd_versions *)msg->data; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg) >= 0 && + msg->result == EC_RES_SUCCESS && + (response->version_mask & EC_VER_MASK(1)); + + kfree(msg); + + return ret; +} + +static int cros_ec_create_console_log(struct cros_ec_debugfs *debug_info) +{ + struct cros_ec_dev *ec = debug_info->ec; + char *buf; + int read_params_size; + int read_response_size; + + if (!ec_read_version_supported(ec)) { + dev_warn(ec->dev, + "device does not support reading the console log\n"); + return 0; + } + + buf = devm_kzalloc(ec->dev, LOG_SIZE, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + read_params_size = sizeof(struct ec_params_console_read_v1); + read_response_size = ec->ec_dev->max_response; + debug_info->read_msg = devm_kzalloc(ec->dev, + sizeof(*debug_info->read_msg) + + max(read_params_size, read_response_size), GFP_KERNEL); + if (!debug_info->read_msg) + return -ENOMEM; + + debug_info->read_msg->version = 1; + debug_info->read_msg->command = EC_CMD_CONSOLE_READ + ec->cmd_offset; + debug_info->read_msg->outsize = read_params_size; + debug_info->read_msg->insize = read_response_size; + + debug_info->log_buffer.buf = buf; + debug_info->log_buffer.head = 0; + debug_info->log_buffer.tail = 0; + + mutex_init(&debug_info->log_mutex); + init_waitqueue_head(&debug_info->log_wq); + + if (!debugfs_create_file("console_log", + S_IFREG | 0444, + debug_info->dir, + debug_info, + &cros_ec_console_log_fops)) + return -ENOMEM; + + INIT_DELAYED_WORK(&debug_info->log_poll_work, + cros_ec_console_log_work); + schedule_delayed_work(&debug_info->log_poll_work, 0); + + return 0; +} + +static void cros_ec_cleanup_console_log(struct cros_ec_debugfs *debug_info) +{ + if (debug_info->log_buffer.buf) { + cancel_delayed_work_sync(&debug_info->log_poll_work); + mutex_destroy(&debug_info->log_mutex); + } +} + +static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info) +{ + struct cros_ec_device *ec_dev = debug_info->ec->ec_dev; + int ret; + struct cros_ec_command *msg; + int insize; + + insize = ec_dev->max_response; + + msg = devm_kzalloc(debug_info->ec->dev, + sizeof(*msg) + insize, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + msg->command = EC_CMD_GET_PANIC_INFO; + msg->insize = insize; + + ret = cros_ec_cmd_xfer(ec_dev, msg); + if (ret < 0) { + dev_warn(debug_info->ec->dev, "Cannot read panicinfo.\n"); + ret = 0; + goto free; + } + + /* No panic data */ + if (ret == 0) + goto free; + + debug_info->panicinfo_blob.data = msg->data; + debug_info->panicinfo_blob.size = ret; + + if (!debugfs_create_blob("panicinfo", + S_IFREG | 0444, + debug_info->dir, + &debug_info->panicinfo_blob)) { + ret = -ENOMEM; + goto free; + } + + return 0; + +free: + devm_kfree(debug_info->ec->dev, msg); + return ret; +} + +static int cros_ec_create_pdinfo(struct cros_ec_debugfs *debug_info) +{ + if (!debugfs_create_file("pdinfo", 0444, debug_info->dir, debug_info, + &cros_ec_pdinfo_fops)) + return -ENOMEM; + + return 0; +} + +int cros_ec_debugfs_init(struct cros_ec_dev *ec) +{ + struct cros_ec_platform *ec_platform = dev_get_platdata(ec->dev); + const char *name = ec_platform->ec_name; + struct cros_ec_debugfs *debug_info; + int ret; + + debug_info = devm_kzalloc(ec->dev, sizeof(*debug_info), GFP_KERNEL); + if (!debug_info) + return -ENOMEM; + + debug_info->ec = ec; + debug_info->dir = debugfs_create_dir(name, NULL); + if (!debug_info->dir) + return -ENOMEM; + + ret = cros_ec_create_panicinfo(debug_info); + if (ret) + goto remove_debugfs; + + ret = cros_ec_create_console_log(debug_info); + if (ret) + goto remove_debugfs; + + ret = cros_ec_create_pdinfo(debug_info); + if (ret) + goto remove_debugfs; + + ec->debug_info = debug_info; + + return 0; + +remove_debugfs: + debugfs_remove_recursive(debug_info->dir); + return ret; +} +EXPORT_SYMBOL(cros_ec_debugfs_init); + +void cros_ec_debugfs_remove(struct cros_ec_dev *ec) +{ + if (!ec->debug_info) + return; + + debugfs_remove_recursive(ec->debug_info->dir); + cros_ec_cleanup_console_log(ec->debug_info); +} +EXPORT_SYMBOL(cros_ec_debugfs_remove); + +void cros_ec_debugfs_suspend(struct cros_ec_dev *ec) +{ + /* + * cros_ec_debugfs_init() failures are non-fatal; it's also possible + * that we initted things but decided that console log wasn't supported. + * We'll use the same set of checks that cros_ec_debugfs_remove() + + * cros_ec_cleanup_console_log() end up using to handle those cases. + */ + if (ec->debug_info && ec->debug_info->log_buffer.buf) + cancel_delayed_work_sync(&ec->debug_info->log_poll_work); +} +EXPORT_SYMBOL(cros_ec_debugfs_suspend); + +void cros_ec_debugfs_resume(struct cros_ec_dev *ec) +{ + if (ec->debug_info && ec->debug_info->log_buffer.buf) + schedule_delayed_work(&ec->debug_info->log_poll_work, 0); +} +EXPORT_SYMBOL(cros_ec_debugfs_resume); diff --git a/drivers/platform/chrome/cros_ec_i2c.c b/drivers/platform/chrome/cros_ec_i2c.c new file mode 100644 index 000000000..ef9b47633 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_i2c.c @@ -0,0 +1,386 @@ +/* + * ChromeOS EC multi-function device (I2C) + * + * Copyright (C) 2012 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +/** + * Request format for protocol v3 + * byte 0 0xda (EC_COMMAND_PROTOCOL_3) + * byte 1-8 struct ec_host_request + * byte 10- response data + */ +struct ec_host_request_i2c { + /* Always 0xda to backward compatible with v2 struct */ + uint8_t command_protocol; + struct ec_host_request ec_request; +} __packed; + + +/* + * Response format for protocol v3 + * byte 0 result code + * byte 1 packet_length + * byte 2-9 struct ec_host_response + * byte 10- response data + */ +struct ec_host_response_i2c { + uint8_t result; + uint8_t packet_length; + struct ec_host_response ec_response; +} __packed; + +static inline struct cros_ec_device *to_ec_dev(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + + return i2c_get_clientdata(client); +} + +static int cros_ec_pkt_xfer_i2c(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + struct i2c_client *client = ec_dev->priv; + int ret = -ENOMEM; + int i; + int packet_len; + u8 *out_buf = NULL; + u8 *in_buf = NULL; + u8 sum; + struct i2c_msg i2c_msg[2]; + struct ec_host_response *ec_response; + struct ec_host_request_i2c *ec_request_i2c; + struct ec_host_response_i2c *ec_response_i2c; + int request_header_size = sizeof(struct ec_host_request_i2c); + int response_header_size = sizeof(struct ec_host_response_i2c); + + i2c_msg[0].addr = client->addr; + i2c_msg[0].flags = 0; + i2c_msg[1].addr = client->addr; + i2c_msg[1].flags = I2C_M_RD; + + packet_len = msg->insize + response_header_size; + BUG_ON(packet_len > ec_dev->din_size); + in_buf = ec_dev->din; + i2c_msg[1].len = packet_len; + i2c_msg[1].buf = (char *) in_buf; + + packet_len = msg->outsize + request_header_size; + BUG_ON(packet_len > ec_dev->dout_size); + out_buf = ec_dev->dout; + i2c_msg[0].len = packet_len; + i2c_msg[0].buf = (char *) out_buf; + + /* create request data */ + ec_request_i2c = (struct ec_host_request_i2c *) out_buf; + ec_request_i2c->command_protocol = EC_COMMAND_PROTOCOL_3; + + ec_dev->dout++; + ret = cros_ec_prepare_tx(ec_dev, msg); + ec_dev->dout--; + + /* send command to EC and read answer */ + ret = i2c_transfer(client->adapter, i2c_msg, 2); + if (ret < 0) { + dev_dbg(ec_dev->dev, "i2c transfer failed: %d\n", ret); + goto done; + } else if (ret != 2) { + dev_err(ec_dev->dev, "failed to get response: %d\n", ret); + ret = -EIO; + goto done; + } + + ec_response_i2c = (struct ec_host_response_i2c *) in_buf; + msg->result = ec_response_i2c->result; + ec_response = &ec_response_i2c->ec_response; + + switch (msg->result) { + case EC_RES_SUCCESS: + break; + case EC_RES_IN_PROGRESS: + ret = -EAGAIN; + dev_dbg(ec_dev->dev, "command 0x%02x in progress\n", + msg->command); + goto done; + + default: + dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n", + msg->command, msg->result); + /* + * When we send v3 request to v2 ec, ec won't recognize the + * 0xda (EC_COMMAND_PROTOCOL_3) and will return with status + * EC_RES_INVALID_COMMAND with zero data length. + * + * In case of invalid command for v3 protocol the data length + * will be at least sizeof(struct ec_host_response) + */ + if (ec_response_i2c->result == EC_RES_INVALID_COMMAND && + ec_response_i2c->packet_length == 0) { + ret = -EPROTONOSUPPORT; + goto done; + } + } + + if (ec_response_i2c->packet_length < sizeof(struct ec_host_response)) { + dev_err(ec_dev->dev, + "response of %u bytes too short; not a full header\n", + ec_response_i2c->packet_length); + ret = -EBADMSG; + goto done; + } + + if (msg->insize < ec_response->data_len) { + dev_err(ec_dev->dev, + "response data size is too large: expected %u, got %u\n", + msg->insize, + ec_response->data_len); + ret = -EMSGSIZE; + goto done; + } + + /* copy response packet payload and compute checksum */ + sum = 0; + for (i = 0; i < sizeof(struct ec_host_response); i++) + sum += ((u8 *)ec_response)[i]; + + memcpy(msg->data, + in_buf + response_header_size, + ec_response->data_len); + for (i = 0; i < ec_response->data_len; i++) + sum += msg->data[i]; + + /* All bytes should sum to zero */ + if (sum) { + dev_err(ec_dev->dev, "bad packet checksum\n"); + ret = -EBADMSG; + goto done; + } + + ret = ec_response->data_len; + +done: + if (msg->command == EC_CMD_REBOOT_EC) + msleep(EC_REBOOT_DELAY_MS); + + return ret; +} + +static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + struct i2c_client *client = ec_dev->priv; + int ret = -ENOMEM; + int i; + int len; + int packet_len; + u8 *out_buf = NULL; + u8 *in_buf = NULL; + u8 sum; + struct i2c_msg i2c_msg[2]; + + i2c_msg[0].addr = client->addr; + i2c_msg[0].flags = 0; + i2c_msg[1].addr = client->addr; + i2c_msg[1].flags = I2C_M_RD; + + /* + * allocate larger packet (one byte for checksum, one byte for + * length, and one for result code) + */ + packet_len = msg->insize + 3; + in_buf = kzalloc(packet_len, GFP_KERNEL); + if (!in_buf) + goto done; + i2c_msg[1].len = packet_len; + i2c_msg[1].buf = (char *)in_buf; + + /* + * allocate larger packet (one byte for checksum, one for + * command code, one for length, and one for command version) + */ + packet_len = msg->outsize + 4; + out_buf = kzalloc(packet_len, GFP_KERNEL); + if (!out_buf) + goto done; + i2c_msg[0].len = packet_len; + i2c_msg[0].buf = (char *)out_buf; + + out_buf[0] = EC_CMD_VERSION0 + msg->version; + out_buf[1] = msg->command; + out_buf[2] = msg->outsize; + + /* copy message payload and compute checksum */ + sum = out_buf[0] + out_buf[1] + out_buf[2]; + for (i = 0; i < msg->outsize; i++) { + out_buf[3 + i] = msg->data[i]; + sum += out_buf[3 + i]; + } + out_buf[3 + msg->outsize] = sum; + + /* send command to EC and read answer */ + ret = i2c_transfer(client->adapter, i2c_msg, 2); + if (ret < 0) { + dev_err(ec_dev->dev, "i2c transfer failed: %d\n", ret); + goto done; + } else if (ret != 2) { + dev_err(ec_dev->dev, "failed to get response: %d\n", ret); + ret = -EIO; + goto done; + } + + /* check response error code */ + msg->result = i2c_msg[1].buf[0]; + ret = cros_ec_check_result(ec_dev, msg); + if (ret) + goto done; + + len = in_buf[1]; + if (len > msg->insize) { + dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", + len, msg->insize); + ret = -ENOSPC; + goto done; + } + + /* copy response packet payload and compute checksum */ + sum = in_buf[0] + in_buf[1]; + for (i = 0; i < len; i++) { + msg->data[i] = in_buf[2 + i]; + sum += in_buf[2 + i]; + } + dev_dbg(ec_dev->dev, "packet: %*ph, sum = %02x\n", + i2c_msg[1].len, in_buf, sum); + if (sum != in_buf[2 + len]) { + dev_err(ec_dev->dev, "bad packet checksum\n"); + ret = -EBADMSG; + goto done; + } + + ret = len; +done: + kfree(in_buf); + kfree(out_buf); + if (msg->command == EC_CMD_REBOOT_EC) + msleep(EC_REBOOT_DELAY_MS); + + return ret; +} + +static int cros_ec_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *dev_id) +{ + struct device *dev = &client->dev; + struct cros_ec_device *ec_dev = NULL; + int err; + + ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); + if (!ec_dev) + return -ENOMEM; + + i2c_set_clientdata(client, ec_dev); + ec_dev->dev = dev; + ec_dev->priv = client; + ec_dev->irq = client->irq; + ec_dev->cmd_xfer = cros_ec_cmd_xfer_i2c; + ec_dev->pkt_xfer = cros_ec_pkt_xfer_i2c; + ec_dev->phys_name = client->adapter->name; + ec_dev->din_size = sizeof(struct ec_host_response_i2c) + + sizeof(struct ec_response_get_protocol_info); + ec_dev->dout_size = sizeof(struct ec_host_request_i2c); + + err = cros_ec_register(ec_dev); + if (err) { + dev_err(dev, "cannot register EC\n"); + return err; + } + + return 0; +} + +static int cros_ec_i2c_remove(struct i2c_client *client) +{ + struct cros_ec_device *ec_dev = i2c_get_clientdata(client); + + cros_ec_remove(ec_dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int cros_ec_i2c_suspend(struct device *dev) +{ + struct cros_ec_device *ec_dev = to_ec_dev(dev); + + return cros_ec_suspend(ec_dev); +} + +static int cros_ec_i2c_resume(struct device *dev) +{ + struct cros_ec_device *ec_dev = to_ec_dev(dev); + + return cros_ec_resume(ec_dev); +} +#endif + +static const struct dev_pm_ops cros_ec_i2c_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_i2c_suspend, cros_ec_i2c_resume) +}; + +#ifdef CONFIG_OF +static const struct of_device_id cros_ec_i2c_of_match[] = { + { .compatible = "google,cros-ec-i2c", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, cros_ec_i2c_of_match); +#endif + +static const struct i2c_device_id cros_ec_i2c_id[] = { + { "cros-ec-i2c", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, cros_ec_i2c_id); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id cros_ec_i2c_acpi_id[] = { + { "GOOG0008", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(acpi, cros_ec_i2c_acpi_id); +#endif + +static struct i2c_driver cros_ec_driver = { + .driver = { + .name = "cros-ec-i2c", + .acpi_match_table = ACPI_PTR(cros_ec_i2c_acpi_id), + .of_match_table = of_match_ptr(cros_ec_i2c_of_match), + .pm = &cros_ec_i2c_pm_ops, + }, + .probe = cros_ec_i2c_probe, + .remove = cros_ec_i2c_remove, + .id_table = cros_ec_i2c_id, +}; + +module_i2c_driver(cros_ec_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ChromeOS EC multi function device"); diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c new file mode 100644 index 000000000..68193bb53 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_lightbar.c @@ -0,0 +1,619 @@ +/* + * cros_ec_lightbar - expose the Chromebook Pixel lightbar to userspace + * + * Copyright (C) 2014 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#define pr_fmt(fmt) "cros_ec_lightbar: " fmt + +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/kobject.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/sched.h> +#include <linux/types.h> +#include <linux/uaccess.h> +#include <linux/slab.h> + +/* Rate-limit the lightbar interface to prevent DoS. */ +static unsigned long lb_interval_jiffies = 50 * HZ / 1000; + +/* + * Whether or not we have given userspace control of the lightbar. + * If this is true, we won't do anything during suspend/resume. + */ +static bool userspace_control; +static struct cros_ec_dev *ec_with_lightbar; + +static ssize_t interval_msec_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long msec = lb_interval_jiffies * 1000 / HZ; + + return scnprintf(buf, PAGE_SIZE, "%lu\n", msec); +} + +static ssize_t interval_msec_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long msec; + + if (kstrtoul(buf, 0, &msec)) + return -EINVAL; + + lb_interval_jiffies = msec * HZ / 1000; + + return count; +} + +static DEFINE_MUTEX(lb_mutex); +/* Return 0 if able to throttle correctly, error otherwise */ +static int lb_throttle(void) +{ + static unsigned long last_access; + unsigned long now, next_timeslot; + long delay; + int ret = 0; + + mutex_lock(&lb_mutex); + + now = jiffies; + next_timeslot = last_access + lb_interval_jiffies; + + if (time_before(now, next_timeslot)) { + delay = (long)(next_timeslot) - (long)now; + set_current_state(TASK_INTERRUPTIBLE); + if (schedule_timeout(delay) > 0) { + /* interrupted - just abort */ + ret = -EINTR; + goto out; + } + now = jiffies; + } + + last_access = now; +out: + mutex_unlock(&lb_mutex); + + return ret; +} + +static struct cros_ec_command *alloc_lightbar_cmd_msg(struct cros_ec_dev *ec) +{ + struct cros_ec_command *msg; + int len; + + len = max(sizeof(struct ec_params_lightbar), + sizeof(struct ec_response_lightbar)); + + msg = kmalloc(sizeof(*msg) + len, GFP_KERNEL); + if (!msg) + return NULL; + + msg->version = 0; + msg->command = EC_CMD_LIGHTBAR_CMD + ec->cmd_offset; + msg->outsize = sizeof(struct ec_params_lightbar); + msg->insize = sizeof(struct ec_response_lightbar); + + return msg; +} + +static int get_lightbar_version(struct cros_ec_dev *ec, + uint32_t *ver_ptr, uint32_t *flg_ptr) +{ + struct ec_params_lightbar *param; + struct ec_response_lightbar *resp; + struct cros_ec_command *msg; + int ret; + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return 0; + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_VERSION; + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) { + ret = 0; + goto exit; + } + + switch (msg->result) { + case EC_RES_INVALID_PARAM: + /* Pixel had no version command. */ + if (ver_ptr) + *ver_ptr = 0; + if (flg_ptr) + *flg_ptr = 0; + ret = 1; + goto exit; + + case EC_RES_SUCCESS: + resp = (struct ec_response_lightbar *)msg->data; + + /* Future devices w/lightbars should implement this command */ + if (ver_ptr) + *ver_ptr = resp->version.num; + if (flg_ptr) + *flg_ptr = resp->version.flags; + ret = 1; + goto exit; + } + + /* Anything else (ie, EC_RES_INVALID_COMMAND) - no lightbar */ + ret = 0; +exit: + kfree(msg); + return ret; +} + +static ssize_t version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + uint32_t version = 0, flags = 0; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + int ret; + + ret = lb_throttle(); + if (ret) + return ret; + + /* This should always succeed, because we check during init. */ + if (!get_lightbar_version(ec, &version, &flags)) + return -EIO; + + return scnprintf(buf, PAGE_SIZE, "%d %d\n", version, flags); +} + +static ssize_t brightness_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ec_params_lightbar *param; + struct cros_ec_command *msg; + int ret; + unsigned int val; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + if (kstrtouint(buf, 0, &val)) + return -EINVAL; + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_SET_BRIGHTNESS; + param->set_brightness.num = val; + ret = lb_throttle(); + if (ret) + goto exit; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto exit; + + if (msg->result != EC_RES_SUCCESS) { + ret = -EINVAL; + goto exit; + } + + ret = count; +exit: + kfree(msg); + return ret; +} + + +/* + * We expect numbers, and we'll keep reading until we find them, skipping over + * any whitespace (sysfs guarantees that the input is null-terminated). Every + * four numbers are sent to the lightbar as <LED,R,G,B>. We fail at the first + * parsing error, if we don't parse any numbers, or if we have numbers left + * over. + */ +static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ec_params_lightbar *param; + struct cros_ec_command *msg; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + unsigned int val[4]; + int ret, i = 0, j = 0, ok = 0; + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + do { + /* Skip any whitespace */ + while (*buf && isspace(*buf)) + buf++; + + if (!*buf) + break; + + ret = sscanf(buf, "%i", &val[i++]); + if (ret == 0) + goto exit; + + if (i == 4) { + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_SET_RGB; + param->set_rgb.led = val[0]; + param->set_rgb.red = val[1]; + param->set_rgb.green = val[2]; + param->set_rgb.blue = val[3]; + /* + * Throttle only the first of every four transactions, + * so that the user can update all four LEDs at once. + */ + if ((j++ % 4) == 0) { + ret = lb_throttle(); + if (ret) + goto exit; + } + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto exit; + + if (msg->result != EC_RES_SUCCESS) + goto exit; + + i = 0; + ok = 1; + } + + /* Skip over the number we just read */ + while (*buf && !isspace(*buf)) + buf++; + + } while (*buf); + +exit: + kfree(msg); + return (ok && i == 0) ? count : -EINVAL; +} + +static char const *seqname[] = { + "ERROR", "S5", "S3", "S0", "S5S3", "S3S0", + "S0S3", "S3S5", "STOP", "RUN", "KONAMI", + "TAP", "PROGRAM", +}; + +static ssize_t sequence_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ec_params_lightbar *param; + struct ec_response_lightbar *resp; + struct cros_ec_command *msg; + int ret; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_GET_SEQ; + ret = lb_throttle(); + if (ret) + goto exit; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto exit; + + if (msg->result != EC_RES_SUCCESS) { + ret = scnprintf(buf, PAGE_SIZE, + "ERROR: EC returned %d\n", msg->result); + goto exit; + } + + resp = (struct ec_response_lightbar *)msg->data; + if (resp->get_seq.num >= ARRAY_SIZE(seqname)) + ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->get_seq.num); + else + ret = scnprintf(buf, PAGE_SIZE, "%s\n", + seqname[resp->get_seq.num]); + +exit: + kfree(msg); + return ret; +} + +static int lb_send_empty_cmd(struct cros_ec_dev *ec, uint8_t cmd) +{ + struct ec_params_lightbar *param; + struct cros_ec_command *msg; + int ret; + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = cmd; + + ret = lb_throttle(); + if (ret) + goto error; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto error; + if (msg->result != EC_RES_SUCCESS) { + ret = -EINVAL; + goto error; + } + ret = 0; +error: + kfree(msg); + + return ret; +} + +int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable) +{ + struct ec_params_lightbar *param; + struct cros_ec_command *msg; + int ret; + + if (ec != ec_with_lightbar) + return 0; + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_lightbar *)msg->data; + + param->cmd = LIGHTBAR_CMD_MANUAL_SUSPEND_CTRL; + param->manual_suspend_ctrl.enable = enable; + + ret = lb_throttle(); + if (ret) + goto error; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto error; + if (msg->result != EC_RES_SUCCESS) { + ret = -EINVAL; + goto error; + } + ret = 0; +error: + kfree(msg); + + return ret; +} +EXPORT_SYMBOL(lb_manual_suspend_ctrl); + +int lb_suspend(struct cros_ec_dev *ec) +{ + if (userspace_control || ec != ec_with_lightbar) + return 0; + + return lb_send_empty_cmd(ec, LIGHTBAR_CMD_SUSPEND); +} +EXPORT_SYMBOL(lb_suspend); + +int lb_resume(struct cros_ec_dev *ec) +{ + if (userspace_control || ec != ec_with_lightbar) + return 0; + + return lb_send_empty_cmd(ec, LIGHTBAR_CMD_RESUME); +} +EXPORT_SYMBOL(lb_resume); + +static ssize_t sequence_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ec_params_lightbar *param; + struct cros_ec_command *msg; + unsigned int num; + int ret, len; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + for (len = 0; len < count; len++) + if (!isalnum(buf[len])) + break; + + for (num = 0; num < ARRAY_SIZE(seqname); num++) + if (!strncasecmp(seqname[num], buf, len)) + break; + + if (num >= ARRAY_SIZE(seqname)) { + ret = kstrtouint(buf, 0, &num); + if (ret) + return ret; + } + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_SEQ; + param->seq.num = num; + ret = lb_throttle(); + if (ret) + goto exit; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto exit; + + if (msg->result != EC_RES_SUCCESS) { + ret = -EINVAL; + goto exit; + } + + ret = count; +exit: + kfree(msg); + return ret; +} + +static ssize_t program_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + int extra_bytes, max_size, ret; + struct ec_params_lightbar *param; + struct cros_ec_command *msg; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + /* + * We might need to reject the program for size reasons. The EC + * enforces a maximum program size, but we also don't want to try + * and send a program that is too big for the protocol. In order + * to ensure the latter, we also need to ensure we have extra bytes + * to represent the rest of the packet. + */ + extra_bytes = sizeof(*param) - sizeof(param->set_program.data); + max_size = min(EC_LB_PROG_LEN, ec->ec_dev->max_request - extra_bytes); + if (count > max_size) { + dev_err(dev, "Program is %u bytes, too long to send (max: %u)", + (unsigned int)count, max_size); + + return -EINVAL; + } + + msg = alloc_lightbar_cmd_msg(ec); + if (!msg) + return -ENOMEM; + + ret = lb_throttle(); + if (ret) + goto exit; + + dev_info(dev, "Copying %zu byte program to EC", count); + + param = (struct ec_params_lightbar *)msg->data; + param->cmd = LIGHTBAR_CMD_SET_PROGRAM; + + param->set_program.size = count; + memcpy(param->set_program.data, buf, count); + + /* + * We need to set the message size manually or else it will use + * EC_LB_PROG_LEN. This might be too long, and the program + * is unlikely to use all of the space. + */ + msg->outsize = count + extra_bytes; + + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + goto exit; + if (msg->result != EC_RES_SUCCESS) { + ret = -EINVAL; + goto exit; + } + + ret = count; +exit: + kfree(msg); + + return ret; +} + +static ssize_t userspace_control_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", userspace_control); +} + +static ssize_t userspace_control_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t count) +{ + bool enable; + int ret; + + ret = strtobool(buf, &enable); + if (ret < 0) + return ret; + + userspace_control = enable; + + return count; +} + +/* Module initialization */ + +static DEVICE_ATTR_RW(interval_msec); +static DEVICE_ATTR_RO(version); +static DEVICE_ATTR_WO(brightness); +static DEVICE_ATTR_WO(led_rgb); +static DEVICE_ATTR_RW(sequence); +static DEVICE_ATTR_WO(program); +static DEVICE_ATTR_RW(userspace_control); + +static struct attribute *__lb_cmds_attrs[] = { + &dev_attr_interval_msec.attr, + &dev_attr_version.attr, + &dev_attr_brightness.attr, + &dev_attr_led_rgb.attr, + &dev_attr_sequence.attr, + &dev_attr_program.attr, + &dev_attr_userspace_control.attr, + NULL, +}; + +bool ec_has_lightbar(struct cros_ec_dev *ec) +{ + return !!get_lightbar_version(ec, NULL, NULL); +} + +static umode_t cros_ec_lightbar_attrs_are_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + struct platform_device *pdev = to_platform_device(ec->dev); + struct cros_ec_platform *pdata = pdev->dev.platform_data; + int is_cros_ec; + + is_cros_ec = strcmp(pdata->ec_name, CROS_EC_DEV_NAME); + + if (is_cros_ec != 0) + return 0; + + /* Only instantiate this stuff if the EC has a lightbar */ + if (ec_has_lightbar(ec)) { + ec_with_lightbar = ec; + return a->mode; + } + return 0; +} + +struct attribute_group cros_ec_lightbar_attr_group = { + .name = "lightbar", + .attrs = __lb_cmds_attrs, + .is_visible = cros_ec_lightbar_attrs_are_visible, +}; +EXPORT_SYMBOL(cros_ec_lightbar_attr_group); diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c new file mode 100644 index 000000000..31c8b8c49 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_lpc.c @@ -0,0 +1,484 @@ +/* + * cros_ec_lpc - LPC access to the Chrome OS Embedded Controller + * + * Copyright (C) 2012-2015 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This driver uses the Chrome OS EC byte-level message-based protocol for + * communicating the keyboard state (which keys are pressed) from a keyboard EC + * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing, + * but everything else (including deghosting) is done here. The main + * motivation for this is to keep the EC firmware as simple as possible, since + * it cannot be easily upgraded and EC flash/IRAM space is relatively + * expensive. + */ + +#include <linux/acpi.h> +#include <linux/dmi.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/mfd/cros_ec_lpc_reg.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/printk.h> +#include <linux/suspend.h> + +#define DRV_NAME "cros_ec_lpcs" +#define ACPI_DRV_NAME "GOOG0004" + +/* True if ACPI device is present */ +static bool cros_ec_lpc_acpi_device_found; + +static int ec_response_timed_out(void) +{ + unsigned long one_second = jiffies + HZ; + u8 data; + + usleep_range(200, 300); + do { + if (!(cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_CMD, 1, &data) & + EC_LPC_STATUS_BUSY_MASK)) + return 0; + usleep_range(100, 200); + } while (time_before(jiffies, one_second)); + + return 1; +} + +static int cros_ec_pkt_xfer_lpc(struct cros_ec_device *ec, + struct cros_ec_command *msg) +{ + struct ec_host_response response; + u8 sum; + int ret = 0; + u8 *dout; + + ret = cros_ec_prepare_tx(ec, msg); + + /* Write buffer */ + cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_PACKET, ret, ec->dout); + + /* Here we go */ + sum = EC_COMMAND_PROTOCOL_3; + cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_CMD, 1, &sum); + + if (ec_response_timed_out()) { + dev_warn(ec->dev, "EC responsed timed out\n"); + ret = -EIO; + goto done; + } + + /* Check result */ + msg->result = cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_DATA, 1, &sum); + ret = cros_ec_check_result(ec, msg); + if (ret) + goto done; + + /* Read back response */ + dout = (u8 *)&response; + sum = cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_PACKET, sizeof(response), + dout); + + msg->result = response.result; + + if (response.data_len > msg->insize) { + dev_err(ec->dev, + "packet too long (%d bytes, expected %d)", + response.data_len, msg->insize); + ret = -EMSGSIZE; + goto done; + } + + /* Read response and process checksum */ + sum += cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_PACKET + + sizeof(response), response.data_len, + msg->data); + + if (sum) { + dev_err(ec->dev, + "bad packet checksum %02x\n", + response.checksum); + ret = -EBADMSG; + goto done; + } + + /* Return actual amount of data received */ + ret = response.data_len; +done: + return ret; +} + +static int cros_ec_cmd_xfer_lpc(struct cros_ec_device *ec, + struct cros_ec_command *msg) +{ + struct ec_lpc_host_args args; + u8 sum; + int ret = 0; + + if (msg->outsize > EC_PROTO2_MAX_PARAM_SIZE || + msg->insize > EC_PROTO2_MAX_PARAM_SIZE) { + dev_err(ec->dev, + "invalid buffer sizes (out %d, in %d)\n", + msg->outsize, msg->insize); + return -EINVAL; + } + + /* Now actually send the command to the EC and get the result */ + args.flags = EC_HOST_ARGS_FLAG_FROM_HOST; + args.command_version = msg->version; + args.data_size = msg->outsize; + + /* Initialize checksum */ + sum = msg->command + args.flags + args.command_version + args.data_size; + + /* Copy data and update checksum */ + sum += cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_PARAM, msg->outsize, + msg->data); + + /* Finalize checksum and write args */ + args.checksum = sum; + cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_ARGS, sizeof(args), + (u8 *)&args); + + /* Here we go */ + sum = msg->command; + cros_ec_lpc_write_bytes(EC_LPC_ADDR_HOST_CMD, 1, &sum); + + if (ec_response_timed_out()) { + dev_warn(ec->dev, "EC responsed timed out\n"); + ret = -EIO; + goto done; + } + + /* Check result */ + msg->result = cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_DATA, 1, &sum); + ret = cros_ec_check_result(ec, msg); + if (ret) + goto done; + + /* Read back args */ + cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_ARGS, sizeof(args), + (u8 *)&args); + + if (args.data_size > msg->insize) { + dev_err(ec->dev, + "packet too long (%d bytes, expected %d)", + args.data_size, msg->insize); + ret = -ENOSPC; + goto done; + } + + /* Start calculating response checksum */ + sum = msg->command + args.flags + args.command_version + args.data_size; + + /* Read response and update checksum */ + sum += cros_ec_lpc_read_bytes(EC_LPC_ADDR_HOST_PARAM, args.data_size, + msg->data); + + /* Verify checksum */ + if (args.checksum != sum) { + dev_err(ec->dev, + "bad packet checksum, expected %02x, got %02x\n", + args.checksum, sum); + ret = -EBADMSG; + goto done; + } + + /* Return actual amount of data received */ + ret = args.data_size; +done: + return ret; +} + +/* Returns num bytes read, or negative on error. Doesn't need locking. */ +static int cros_ec_lpc_readmem(struct cros_ec_device *ec, unsigned int offset, + unsigned int bytes, void *dest) +{ + int i = offset; + char *s = dest; + int cnt = 0; + + if (offset >= EC_MEMMAP_SIZE - bytes) + return -EINVAL; + + /* fixed length */ + if (bytes) { + cros_ec_lpc_read_bytes(EC_LPC_ADDR_MEMMAP + offset, bytes, s); + return bytes; + } + + /* string */ + for (; i < EC_MEMMAP_SIZE; i++, s++) { + cros_ec_lpc_read_bytes(EC_LPC_ADDR_MEMMAP + i, 1, s); + cnt++; + if (!*s) + break; + } + + return cnt; +} + +static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data) +{ + struct cros_ec_device *ec_dev = data; + + if (ec_dev->mkbp_event_supported && + cros_ec_get_next_event(ec_dev, NULL) > 0) + blocking_notifier_call_chain(&ec_dev->event_notifier, 0, + ec_dev); + + if (value == ACPI_NOTIFY_DEVICE_WAKE) + pm_system_wakeup(); +} + +static int cros_ec_lpc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct acpi_device *adev; + acpi_status status; + struct cros_ec_device *ec_dev; + u8 buf[2]; + int ret; + + if (!devm_request_region(dev, EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE, + dev_name(dev))) { + dev_err(dev, "couldn't reserve memmap region\n"); + return -EBUSY; + } + + cros_ec_lpc_read_bytes(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID, 2, buf); + if (buf[0] != 'E' || buf[1] != 'C') { + dev_err(dev, "EC ID not detected\n"); + return -ENODEV; + } + + if (!devm_request_region(dev, EC_HOST_CMD_REGION0, + EC_HOST_CMD_REGION_SIZE, dev_name(dev))) { + dev_err(dev, "couldn't reserve region0\n"); + return -EBUSY; + } + if (!devm_request_region(dev, EC_HOST_CMD_REGION1, + EC_HOST_CMD_REGION_SIZE, dev_name(dev))) { + dev_err(dev, "couldn't reserve region1\n"); + return -EBUSY; + } + + ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); + if (!ec_dev) + return -ENOMEM; + + platform_set_drvdata(pdev, ec_dev); + ec_dev->dev = dev; + ec_dev->phys_name = dev_name(dev); + ec_dev->cmd_xfer = cros_ec_cmd_xfer_lpc; + ec_dev->pkt_xfer = cros_ec_pkt_xfer_lpc; + ec_dev->cmd_readmem = cros_ec_lpc_readmem; + ec_dev->din_size = sizeof(struct ec_host_response) + + sizeof(struct ec_response_get_protocol_info); + ec_dev->dout_size = sizeof(struct ec_host_request); + + ret = cros_ec_register(ec_dev); + if (ret) { + dev_err(dev, "couldn't register ec_dev (%d)\n", ret); + return ret; + } + + /* + * Connect a notify handler to process MKBP messages if we have a + * companion ACPI device. + */ + adev = ACPI_COMPANION(dev); + if (adev) { + status = acpi_install_notify_handler(adev->handle, + ACPI_ALL_NOTIFY, + cros_ec_lpc_acpi_notify, + ec_dev); + if (ACPI_FAILURE(status)) + dev_warn(dev, "Failed to register notifier %08x\n", + status); + } + + return 0; +} + +static int cros_ec_lpc_remove(struct platform_device *pdev) +{ + struct cros_ec_device *ec_dev; + struct acpi_device *adev; + + adev = ACPI_COMPANION(&pdev->dev); + if (adev) + acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY, + cros_ec_lpc_acpi_notify); + + ec_dev = platform_get_drvdata(pdev); + cros_ec_remove(ec_dev); + + return 0; +} + +static const struct acpi_device_id cros_ec_lpc_acpi_device_ids[] = { + { ACPI_DRV_NAME, 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, cros_ec_lpc_acpi_device_ids); + +static const struct dmi_system_id cros_ec_lpc_dmi_table[] __initconst = { + { + /* + * Today all Chromebooks/boxes ship with Google_* as version and + * coreboot as bios vendor. No other systems with this + * combination are known to date. + */ + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_BIOS_VERSION, "Google_"), + }, + }, + { + /* + * If the box is running custom coreboot firmware then the + * DMI BIOS version string will not be matched by "Google_", + * but the system vendor string will still be matched by + * "GOOGLE". + */ + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"), + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + }, + }, + { + /* x86-link, the Chromebook Pixel. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Link"), + }, + }, + { + /* x86-samus, the Chromebook Pixel 2. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Samus"), + }, + }, + { + /* x86-peppy, the Acer C720 Chromebook. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), + DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"), + }, + }, + { + /* x86-glimmer, the Lenovo Thinkpad Yoga 11e. */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Glimmer"), + }, + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table); + +#ifdef CONFIG_PM_SLEEP +static int cros_ec_lpc_suspend(struct device *dev) +{ + struct cros_ec_device *ec_dev = dev_get_drvdata(dev); + + return cros_ec_suspend(ec_dev); +} + +static int cros_ec_lpc_resume(struct device *dev) +{ + struct cros_ec_device *ec_dev = dev_get_drvdata(dev); + + return cros_ec_resume(ec_dev); +} +#endif + +const struct dev_pm_ops cros_ec_lpc_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(cros_ec_lpc_suspend, cros_ec_lpc_resume) +}; + +static struct platform_driver cros_ec_lpc_driver = { + .driver = { + .name = DRV_NAME, + .acpi_match_table = cros_ec_lpc_acpi_device_ids, + .pm = &cros_ec_lpc_pm_ops, + }, + .probe = cros_ec_lpc_probe, + .remove = cros_ec_lpc_remove, +}; + +static struct platform_device cros_ec_lpc_device = { + .name = DRV_NAME +}; + +static acpi_status cros_ec_lpc_parse_device(acpi_handle handle, u32 level, + void *context, void **retval) +{ + *(bool *)context = true; + return AE_CTRL_TERMINATE; +} + +static int __init cros_ec_lpc_init(void) +{ + int ret; + acpi_status status; + + status = acpi_get_devices(ACPI_DRV_NAME, cros_ec_lpc_parse_device, + &cros_ec_lpc_acpi_device_found, NULL); + if (ACPI_FAILURE(status)) + pr_warn(DRV_NAME ": Looking for %s failed\n", ACPI_DRV_NAME); + + if (!cros_ec_lpc_acpi_device_found && + !dmi_check_system(cros_ec_lpc_dmi_table)) { + pr_err(DRV_NAME ": unsupported system.\n"); + return -ENODEV; + } + + cros_ec_lpc_reg_init(); + + /* Register the driver */ + ret = platform_driver_register(&cros_ec_lpc_driver); + if (ret) { + pr_err(DRV_NAME ": can't register driver: %d\n", ret); + cros_ec_lpc_reg_destroy(); + return ret; + } + + if (!cros_ec_lpc_acpi_device_found) { + /* Register the device, and it'll get hooked up automatically */ + ret = platform_device_register(&cros_ec_lpc_device); + if (ret) { + pr_err(DRV_NAME ": can't register device: %d\n", ret); + platform_driver_unregister(&cros_ec_lpc_driver); + cros_ec_lpc_reg_destroy(); + } + } + + return ret; +} + +static void __exit cros_ec_lpc_exit(void) +{ + if (!cros_ec_lpc_acpi_device_found) + platform_device_unregister(&cros_ec_lpc_device); + platform_driver_unregister(&cros_ec_lpc_driver); + cros_ec_lpc_reg_destroy(); +} + +module_init(cros_ec_lpc_init); +module_exit(cros_ec_lpc_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ChromeOS EC LPC driver"); diff --git a/drivers/platform/chrome/cros_ec_lpc_mec.c b/drivers/platform/chrome/cros_ec_lpc_mec.c new file mode 100644 index 000000000..2eda2c2fc --- /dev/null +++ b/drivers/platform/chrome/cros_ec_lpc_mec.c @@ -0,0 +1,140 @@ +/* + * cros_ec_lpc_mec - LPC variant I/O for Microchip EC + * + * Copyright (C) 2016 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This driver uses the Chrome OS EC byte-level message-based protocol for + * communicating the keyboard state (which keys are pressed) from a keyboard EC + * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing, + * but everything else (including deghosting) is done here. The main + * motivation for this is to keep the EC firmware as simple as possible, since + * it cannot be easily upgraded and EC flash/IRAM space is relatively + * expensive. + */ + +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/mfd/cros_ec_lpc_mec.h> +#include <linux/mutex.h> +#include <linux/types.h> + +/* + * This mutex must be held while accessing the EMI unit. We can't rely on the + * EC mutex because memmap data may be accessed without it being held. + */ +static struct mutex io_mutex; + +/* + * cros_ec_lpc_mec_emi_write_address + * + * Initialize EMI read / write at a given address. + * + * @addr: Starting read / write address + * @access_type: Type of access, typically 32-bit auto-increment + */ +static void cros_ec_lpc_mec_emi_write_address(u16 addr, + enum cros_ec_lpc_mec_emi_access_mode access_type) +{ + /* Address relative to start of EMI range */ + addr -= MEC_EMI_RANGE_START; + outb((addr & 0xfc) | access_type, MEC_EMI_EC_ADDRESS_B0); + outb((addr >> 8) & 0x7f, MEC_EMI_EC_ADDRESS_B1); +} + +/* + * cros_ec_lpc_io_bytes_mec - Read / write bytes to MEC EMI port + * + * @io_type: MEC_IO_READ or MEC_IO_WRITE, depending on request + * @offset: Base read / write address + * @length: Number of bytes to read / write + * @buf: Destination / source buffer + * + * @return 8-bit checksum of all bytes read / written + */ +u8 cros_ec_lpc_io_bytes_mec(enum cros_ec_lpc_mec_io_type io_type, + unsigned int offset, unsigned int length, + u8 *buf) +{ + int i = 0; + int io_addr; + u8 sum = 0; + enum cros_ec_lpc_mec_emi_access_mode access, new_access; + + /* + * Long access cannot be used on misaligned data since reading B0 loads + * the data register and writing B3 flushes. + */ + if (offset & 0x3 || length < 4) + access = ACCESS_TYPE_BYTE; + else + access = ACCESS_TYPE_LONG_AUTO_INCREMENT; + + mutex_lock(&io_mutex); + + /* Initialize I/O at desired address */ + cros_ec_lpc_mec_emi_write_address(offset, access); + + /* Skip bytes in case of misaligned offset */ + io_addr = MEC_EMI_EC_DATA_B0 + (offset & 0x3); + while (i < length) { + while (io_addr <= MEC_EMI_EC_DATA_B3) { + if (io_type == MEC_IO_READ) + buf[i] = inb(io_addr++); + else + outb(buf[i], io_addr++); + + sum += buf[i++]; + offset++; + + /* Extra bounds check in case of misaligned length */ + if (i == length) + goto done; + } + + /* + * Use long auto-increment access except for misaligned write, + * since writing B3 triggers the flush. + */ + if (length - i < 4 && io_type == MEC_IO_WRITE) + new_access = ACCESS_TYPE_BYTE; + else + new_access = ACCESS_TYPE_LONG_AUTO_INCREMENT; + + if (new_access != access || + access != ACCESS_TYPE_LONG_AUTO_INCREMENT) { + access = new_access; + cros_ec_lpc_mec_emi_write_address(offset, access); + } + + /* Access [B0, B3] on each loop pass */ + io_addr = MEC_EMI_EC_DATA_B0; + } + +done: + mutex_unlock(&io_mutex); + + return sum; +} +EXPORT_SYMBOL(cros_ec_lpc_io_bytes_mec); + +void cros_ec_lpc_mec_init(void) +{ + mutex_init(&io_mutex); +} +EXPORT_SYMBOL(cros_ec_lpc_mec_init); + +void cros_ec_lpc_mec_destroy(void) +{ + mutex_destroy(&io_mutex); +} +EXPORT_SYMBOL(cros_ec_lpc_mec_destroy); diff --git a/drivers/platform/chrome/cros_ec_lpc_reg.c b/drivers/platform/chrome/cros_ec_lpc_reg.c new file mode 100644 index 000000000..dcc7a3e30 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_lpc_reg.c @@ -0,0 +1,133 @@ +/* + * cros_ec_lpc_reg - LPC access to the Chrome OS Embedded Controller + * + * Copyright (C) 2016 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This driver uses the Chrome OS EC byte-level message-based protocol for + * communicating the keyboard state (which keys are pressed) from a keyboard EC + * to the AP over some bus (such as i2c, lpc, spi). The EC does debouncing, + * but everything else (including deghosting) is done here. The main + * motivation for this is to keep the EC firmware as simple as possible, since + * it cannot be easily upgraded and EC flash/IRAM space is relatively + * expensive. + */ + +#include <linux/io.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/mfd/cros_ec_lpc_mec.h> + +static u8 lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest) +{ + int i; + int sum = 0; + + for (i = 0; i < length; ++i) { + dest[i] = inb(offset + i); + sum += dest[i]; + } + + /* Return checksum of all bytes read */ + return sum; +} + +static u8 lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg) +{ + int i; + int sum = 0; + + for (i = 0; i < length; ++i) { + outb(msg[i], offset + i); + sum += msg[i]; + } + + /* Return checksum of all bytes written */ + return sum; +} + +#ifdef CONFIG_CROS_EC_LPC_MEC + +u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest) +{ + if (length == 0) + return 0; + + /* Access desired range through EMI interface */ + if (offset >= MEC_EMI_RANGE_START && offset <= MEC_EMI_RANGE_END) { + /* Ensure we don't straddle EMI region */ + if (WARN_ON(offset + length - 1 > MEC_EMI_RANGE_END)) + return 0; + + return cros_ec_lpc_io_bytes_mec(MEC_IO_READ, offset, length, + dest); + } + + if (WARN_ON(offset + length > MEC_EMI_RANGE_START && + offset < MEC_EMI_RANGE_START)) + return 0; + + return lpc_read_bytes(offset, length, dest); +} + +u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg) +{ + if (length == 0) + return 0; + + /* Access desired range through EMI interface */ + if (offset >= MEC_EMI_RANGE_START && offset <= MEC_EMI_RANGE_END) { + /* Ensure we don't straddle EMI region */ + if (WARN_ON(offset + length - 1 > MEC_EMI_RANGE_END)) + return 0; + + return cros_ec_lpc_io_bytes_mec(MEC_IO_WRITE, offset, length, + msg); + } + + if (WARN_ON(offset + length > MEC_EMI_RANGE_START && + offset < MEC_EMI_RANGE_START)) + return 0; + + return lpc_write_bytes(offset, length, msg); +} + +void cros_ec_lpc_reg_init(void) +{ + cros_ec_lpc_mec_init(); +} + +void cros_ec_lpc_reg_destroy(void) +{ + cros_ec_lpc_mec_destroy(); +} + +#else /* CONFIG_CROS_EC_LPC_MEC */ + +u8 cros_ec_lpc_read_bytes(unsigned int offset, unsigned int length, u8 *dest) +{ + return lpc_read_bytes(offset, length, dest); +} + +u8 cros_ec_lpc_write_bytes(unsigned int offset, unsigned int length, u8 *msg) +{ + return lpc_write_bytes(offset, length, msg); +} + +void cros_ec_lpc_reg_init(void) +{ +} + +void cros_ec_lpc_reg_destroy(void) +{ +} + +#endif /* CONFIG_CROS_EC_LPC_MEC */ diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c new file mode 100644 index 000000000..2b807c8aa --- /dev/null +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -0,0 +1,658 @@ +/* + * ChromeOS EC communication protocol helper functions + * + * Copyright (C) 2015 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/mfd/cros_ec.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <asm/unaligned.h> + +#define EC_COMMAND_RETRIES 50 + +static int prepare_packet(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + struct ec_host_request *request; + u8 *out; + int i; + u8 csum = 0; + + BUG_ON(ec_dev->proto_version != EC_HOST_REQUEST_VERSION); + BUG_ON(msg->outsize + sizeof(*request) > ec_dev->dout_size); + + out = ec_dev->dout; + request = (struct ec_host_request *)out; + request->struct_version = EC_HOST_REQUEST_VERSION; + request->checksum = 0; + request->command = msg->command; + request->command_version = msg->version; + request->reserved = 0; + request->data_len = msg->outsize; + + for (i = 0; i < sizeof(*request); i++) + csum += out[i]; + + /* Copy data and update checksum */ + memcpy(out + sizeof(*request), msg->data, msg->outsize); + for (i = 0; i < msg->outsize; i++) + csum += msg->data[i]; + + request->checksum = -csum; + + return sizeof(*request) + msg->outsize; +} + +static int send_command(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int ret; + int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg); + + if (ec_dev->proto_version > 2) + xfer_fxn = ec_dev->pkt_xfer; + else + xfer_fxn = ec_dev->cmd_xfer; + + if (!xfer_fxn) { + /* + * This error can happen if a communication error happened and + * the EC is trying to use protocol v2, on an underlying + * communication mechanism that does not support v2. + */ + dev_err_once(ec_dev->dev, + "missing EC transfer API, cannot send command\n"); + return -EIO; + } + + ret = (*xfer_fxn)(ec_dev, msg); + if (msg->result == EC_RES_IN_PROGRESS) { + int i; + struct cros_ec_command *status_msg; + struct ec_response_get_comms_status *status; + + status_msg = kmalloc(sizeof(*status_msg) + sizeof(*status), + GFP_KERNEL); + if (!status_msg) + return -ENOMEM; + + status_msg->version = 0; + status_msg->command = EC_CMD_GET_COMMS_STATUS; + status_msg->insize = sizeof(*status); + status_msg->outsize = 0; + + /* + * Query the EC's status until it's no longer busy or + * we encounter an error. + */ + for (i = 0; i < EC_COMMAND_RETRIES; i++) { + usleep_range(10000, 11000); + + ret = (*xfer_fxn)(ec_dev, status_msg); + if (ret == -EAGAIN) + continue; + if (ret < 0) + break; + + msg->result = status_msg->result; + if (status_msg->result != EC_RES_SUCCESS) + break; + + status = (struct ec_response_get_comms_status *) + status_msg->data; + if (!(status->flags & EC_COMMS_STATUS_PROCESSING)) + break; + } + + kfree(status_msg); + } + + return ret; +} + +int cros_ec_prepare_tx(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + u8 *out; + u8 csum; + int i; + + if (ec_dev->proto_version > 2) + return prepare_packet(ec_dev, msg); + + BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE); + out = ec_dev->dout; + out[0] = EC_CMD_VERSION0 + msg->version; + out[1] = msg->command; + out[2] = msg->outsize; + csum = out[0] + out[1] + out[2]; + for (i = 0; i < msg->outsize; i++) + csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->data[i]; + out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = csum; + + return EC_MSG_TX_PROTO_BYTES + msg->outsize; +} +EXPORT_SYMBOL(cros_ec_prepare_tx); + +int cros_ec_check_result(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + switch (msg->result) { + case EC_RES_SUCCESS: + return 0; + case EC_RES_IN_PROGRESS: + dev_dbg(ec_dev->dev, "command 0x%02x in progress\n", + msg->command); + return -EAGAIN; + default: + dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n", + msg->command, msg->result); + return 0; + } +} +EXPORT_SYMBOL(cros_ec_check_result); + +/* + * cros_ec_get_host_event_wake_mask + * + * Get the mask of host events that cause wake from suspend. + * + * @ec_dev: EC device to call + * @msg: message structure to use + * @mask: result when function returns >=0. + * + * LOCKING: + * the caller has ec_dev->lock mutex, or the caller knows there is + * no other command in progress. + */ +static int cros_ec_get_host_event_wake_mask(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg, + uint32_t *mask) +{ + struct ec_response_host_event_mask *r; + int ret; + + msg->command = EC_CMD_HOST_EVENT_GET_WAKE_MASK; + msg->version = 0; + msg->outsize = 0; + msg->insize = sizeof(*r); + + ret = send_command(ec_dev, msg); + if (ret > 0) { + r = (struct ec_response_host_event_mask *)msg->data; + *mask = r->mask; + } + + return ret; +} + +static int cros_ec_host_command_proto_query(struct cros_ec_device *ec_dev, + int devidx, + struct cros_ec_command *msg) +{ + /* + * Try using v3+ to query for supported protocols. If this + * command fails, fall back to v2. Returns the highest protocol + * supported by the EC. + * Also sets the max request/response/passthru size. + */ + int ret; + + if (!ec_dev->pkt_xfer) + return -EPROTONOSUPPORT; + + memset(msg, 0, sizeof(*msg)); + msg->command = EC_CMD_PASSTHRU_OFFSET(devidx) | EC_CMD_GET_PROTOCOL_INFO; + msg->insize = sizeof(struct ec_response_get_protocol_info); + + ret = send_command(ec_dev, msg); + /* + * Send command once again when timeout occurred. + * Fingerprint MCU (FPMCU) is restarted during system boot which + * introduces small window in which FPMCU won't respond for any + * messages sent by kernel. There is no need to wait before next + * attempt because we waited at least EC_MSG_DEADLINE_MS. + */ + if (ret == -ETIMEDOUT) + ret = send_command(ec_dev, msg); + + if (ret < 0) { + dev_dbg(ec_dev->dev, + "failed to check for EC[%d] protocol version: %d\n", + devidx, ret); + return ret; + } + + if (devidx > 0 && msg->result == EC_RES_INVALID_COMMAND) + return -ENODEV; + else if (msg->result != EC_RES_SUCCESS) + return msg->result; + + return 0; +} + +static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev) +{ + struct cros_ec_command *msg; + struct ec_params_hello *hello_params; + struct ec_response_hello *hello_response; + int ret; + int len = max(sizeof(*hello_params), sizeof(*hello_response)); + + msg = kmalloc(sizeof(*msg) + len, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + msg->version = 0; + msg->command = EC_CMD_HELLO; + hello_params = (struct ec_params_hello *)msg->data; + msg->outsize = sizeof(*hello_params); + hello_response = (struct ec_response_hello *)msg->data; + msg->insize = sizeof(*hello_response); + + hello_params->in_data = 0xa0b0c0d0; + + ret = send_command(ec_dev, msg); + + if (ret < 0) { + dev_dbg(ec_dev->dev, + "EC failed to respond to v2 hello: %d\n", + ret); + goto exit; + } else if (msg->result != EC_RES_SUCCESS) { + dev_err(ec_dev->dev, + "EC responded to v2 hello with error: %d\n", + msg->result); + ret = msg->result; + goto exit; + } else if (hello_response->out_data != 0xa1b2c3d4) { + dev_err(ec_dev->dev, + "EC responded to v2 hello with bad result: %u\n", + hello_response->out_data); + ret = -EBADMSG; + goto exit; + } + + ret = 0; + + exit: + kfree(msg); + return ret; +} + +/* + * cros_ec_get_host_command_version_mask + * + * Get the version mask of a given command. + * + * @ec_dev: EC device to call + * @msg: message structure to use + * @cmd: command to get the version of. + * @mask: result when function returns 0. + * + * @return 0 on success, error code otherwise + * + * LOCKING: + * the caller has ec_dev->lock mutex or the caller knows there is + * no other command in progress. + */ +static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev, + u16 cmd, u32 *mask) +{ + struct ec_params_get_cmd_versions *pver; + struct ec_response_get_cmd_versions *rver; + struct cros_ec_command *msg; + int ret; + + msg = kmalloc(sizeof(*msg) + max(sizeof(*rver), sizeof(*pver)), + GFP_KERNEL); + if (!msg) + return -ENOMEM; + + msg->version = 0; + msg->command = EC_CMD_GET_CMD_VERSIONS; + msg->insize = sizeof(*rver); + msg->outsize = sizeof(*pver); + + pver = (struct ec_params_get_cmd_versions *)msg->data; + pver->cmd = cmd; + + ret = send_command(ec_dev, msg); + if (ret > 0) { + rver = (struct ec_response_get_cmd_versions *)msg->data; + *mask = rver->version_mask; + } + + kfree(msg); + + return ret; +} + +int cros_ec_query_all(struct cros_ec_device *ec_dev) +{ + struct device *dev = ec_dev->dev; + struct cros_ec_command *proto_msg; + struct ec_response_get_protocol_info *proto_info; + u32 ver_mask = 0; + int ret; + + proto_msg = kzalloc(sizeof(*proto_msg) + sizeof(*proto_info), + GFP_KERNEL); + if (!proto_msg) + return -ENOMEM; + + /* First try sending with proto v3. */ + ec_dev->proto_version = 3; + ret = cros_ec_host_command_proto_query(ec_dev, 0, proto_msg); + + if (ret == 0) { + proto_info = (struct ec_response_get_protocol_info *) + proto_msg->data; + ec_dev->max_request = proto_info->max_request_packet_size - + sizeof(struct ec_host_request); + ec_dev->max_response = proto_info->max_response_packet_size - + sizeof(struct ec_host_response); + ec_dev->proto_version = + min(EC_HOST_REQUEST_VERSION, + fls(proto_info->protocol_versions) - 1); + dev_dbg(ec_dev->dev, + "using proto v%u\n", + ec_dev->proto_version); + + ec_dev->din_size = ec_dev->max_response + + sizeof(struct ec_host_response) + + EC_MAX_RESPONSE_OVERHEAD; + ec_dev->dout_size = ec_dev->max_request + + sizeof(struct ec_host_request) + + EC_MAX_REQUEST_OVERHEAD; + + /* + * Check for PD + */ + ret = cros_ec_host_command_proto_query(ec_dev, 1, proto_msg); + + if (ret) { + dev_dbg(ec_dev->dev, "no PD chip found: %d\n", ret); + ec_dev->max_passthru = 0; + } else { + dev_dbg(ec_dev->dev, "found PD chip\n"); + ec_dev->max_passthru = + proto_info->max_request_packet_size - + sizeof(struct ec_host_request); + } + } else { + /* Try querying with a v2 hello message. */ + ec_dev->proto_version = 2; + ret = cros_ec_host_command_proto_query_v2(ec_dev); + + if (ret == 0) { + /* V2 hello succeeded. */ + dev_dbg(ec_dev->dev, "falling back to proto v2\n"); + + ec_dev->max_request = EC_PROTO2_MAX_PARAM_SIZE; + ec_dev->max_response = EC_PROTO2_MAX_PARAM_SIZE; + ec_dev->max_passthru = 0; + ec_dev->pkt_xfer = NULL; + ec_dev->din_size = EC_PROTO2_MSG_BYTES; + ec_dev->dout_size = EC_PROTO2_MSG_BYTES; + } else { + /* + * It's possible for a test to occur too early when + * the EC isn't listening. If this happens, we'll + * test later when the first command is run. + */ + ec_dev->proto_version = EC_PROTO_VERSION_UNKNOWN; + dev_dbg(ec_dev->dev, "EC query failed: %d\n", ret); + goto exit; + } + } + + devm_kfree(dev, ec_dev->din); + devm_kfree(dev, ec_dev->dout); + + ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL); + if (!ec_dev->din) { + ret = -ENOMEM; + goto exit; + } + + ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL); + if (!ec_dev->dout) { + devm_kfree(dev, ec_dev->din); + ret = -ENOMEM; + goto exit; + } + + /* Probe if MKBP event is supported */ + ret = cros_ec_get_host_command_version_mask(ec_dev, + EC_CMD_GET_NEXT_EVENT, + &ver_mask); + if (ret < 0 || ver_mask == 0) + ec_dev->mkbp_event_supported = 0; + else + ec_dev->mkbp_event_supported = 1; + + /* + * Get host event wake mask, assume all events are wake events + * if unavailable. + */ + ret = cros_ec_get_host_event_wake_mask(ec_dev, proto_msg, + &ec_dev->host_event_wake_mask); + if (ret < 0) + ec_dev->host_event_wake_mask = U32_MAX; + + ret = 0; + +exit: + kfree(proto_msg); + return ret; +} +EXPORT_SYMBOL(cros_ec_query_all); + +int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int ret; + + mutex_lock(&ec_dev->lock); + if (ec_dev->proto_version == EC_PROTO_VERSION_UNKNOWN) { + ret = cros_ec_query_all(ec_dev); + if (ret) { + dev_err(ec_dev->dev, + "EC version unknown and query failed; aborting command\n"); + mutex_unlock(&ec_dev->lock); + return ret; + } + } + + if (msg->insize > ec_dev->max_response) { + dev_dbg(ec_dev->dev, "clamping message receive buffer\n"); + msg->insize = ec_dev->max_response; + } + + if (msg->command < EC_CMD_PASSTHRU_OFFSET(1)) { + if (msg->outsize > ec_dev->max_request) { + dev_err(ec_dev->dev, + "request of size %u is too big (max: %u)\n", + msg->outsize, + ec_dev->max_request); + mutex_unlock(&ec_dev->lock); + return -EMSGSIZE; + } + } else { + if (msg->outsize > ec_dev->max_passthru) { + dev_err(ec_dev->dev, + "passthru rq of size %u is too big (max: %u)\n", + msg->outsize, + ec_dev->max_passthru); + mutex_unlock(&ec_dev->lock); + return -EMSGSIZE; + } + } + ret = send_command(ec_dev, msg); + mutex_unlock(&ec_dev->lock); + + return ret; +} +EXPORT_SYMBOL(cros_ec_cmd_xfer); + +int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int ret; + + ret = cros_ec_cmd_xfer(ec_dev, msg); + if (ret < 0) { + dev_err(ec_dev->dev, "Command xfer error (err:%d)\n", ret); + } else if (msg->result != EC_RES_SUCCESS) { + dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result); + return -EPROTO; + } + + return ret; +} +EXPORT_SYMBOL(cros_ec_cmd_xfer_status); + +static int get_next_event_xfer(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg, + int version, uint32_t size) +{ + int ret; + + msg->version = version; + msg->command = EC_CMD_GET_NEXT_EVENT; + msg->insize = size; + msg->outsize = 0; + + ret = cros_ec_cmd_xfer(ec_dev, msg); + if (ret > 0) { + ec_dev->event_size = ret - 1; + memcpy(&ec_dev->event_data, msg->data, ret); + } + + return ret; +} + +static int get_next_event(struct cros_ec_device *ec_dev) +{ + u8 buffer[sizeof(struct cros_ec_command) + sizeof(ec_dev->event_data)]; + struct cros_ec_command *msg = (struct cros_ec_command *)&buffer; + static int cmd_version = 1; + int ret; + + if (ec_dev->suspended) { + dev_dbg(ec_dev->dev, "Device suspended.\n"); + return -EHOSTDOWN; + } + + if (cmd_version == 1) { + ret = get_next_event_xfer(ec_dev, msg, cmd_version, + sizeof(struct ec_response_get_next_event_v1)); + if (ret < 0 || msg->result != EC_RES_INVALID_VERSION) + return ret; + + /* Fallback to version 0 for future send attempts */ + cmd_version = 0; + } + + ret = get_next_event_xfer(ec_dev, msg, cmd_version, + sizeof(struct ec_response_get_next_event)); + + return ret; +} + +static int get_keyboard_state_event(struct cros_ec_device *ec_dev) +{ + u8 buffer[sizeof(struct cros_ec_command) + + sizeof(ec_dev->event_data.data)]; + struct cros_ec_command *msg = (struct cros_ec_command *)&buffer; + + msg->version = 0; + msg->command = EC_CMD_MKBP_STATE; + msg->insize = sizeof(ec_dev->event_data.data); + msg->outsize = 0; + + ec_dev->event_size = cros_ec_cmd_xfer(ec_dev, msg); + ec_dev->event_data.event_type = EC_MKBP_EVENT_KEY_MATRIX; + memcpy(&ec_dev->event_data.data, msg->data, + sizeof(ec_dev->event_data.data)); + + return ec_dev->event_size; +} + +int cros_ec_get_next_event(struct cros_ec_device *ec_dev, bool *wake_event) +{ + u8 event_type; + u32 host_event; + int ret; + + if (!ec_dev->mkbp_event_supported) { + ret = get_keyboard_state_event(ec_dev); + if (ret < 0) + return ret; + + if (wake_event) + *wake_event = true; + + return ret; + } + + ret = get_next_event(ec_dev); + if (ret < 0) + return ret; + + if (wake_event) { + event_type = ec_dev->event_data.event_type; + host_event = cros_ec_get_host_event(ec_dev); + + /* + * Sensor events need to be parsed by the sensor sub-device. + * Defer them, and don't report the wakeup here. + */ + if (event_type == EC_MKBP_EVENT_SENSOR_FIFO) + *wake_event = false; + /* Masked host-events should not count as wake events. */ + else if (host_event && + !(host_event & ec_dev->host_event_wake_mask)) + *wake_event = false; + /* Consider all other events as wake events. */ + else + *wake_event = true; + } + + return ret; +} +EXPORT_SYMBOL(cros_ec_get_next_event); + +u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev) +{ + u32 host_event; + + BUG_ON(!ec_dev->mkbp_event_supported); + + if (ec_dev->event_data.event_type != EC_MKBP_EVENT_HOST_EVENT) + return 0; + + if (ec_dev->event_size != sizeof(host_event)) { + dev_warn(ec_dev->dev, "Invalid host event size\n"); + return 0; + } + + host_event = get_unaligned_le32(&ec_dev->event_data.data.host_event); + + return host_event; +} +EXPORT_SYMBOL(cros_ec_get_host_event); diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c new file mode 100644 index 000000000..2060d1483 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_spi.c @@ -0,0 +1,743 @@ +/* + * ChromeOS EC multi-function device (SPI) + * + * Copyright (C) 2012 Google, Inc + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/delay.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> + + +/* The header byte, which follows the preamble */ +#define EC_MSG_HEADER 0xec + +/* + * Number of EC preamble bytes we read at a time. Since it takes + * about 400-500us for the EC to respond there is not a lot of + * point in tuning this. If the EC could respond faster then + * we could increase this so that might expect the preamble and + * message to occur in a single transaction. However, the maximum + * SPI transfer size is 256 bytes, so at 5MHz we need a response + * time of perhaps <320us (200 bytes / 1600 bits). + */ +#define EC_MSG_PREAMBLE_COUNT 32 + +/* + * Allow for a long time for the EC to respond. We support i2c + * tunneling and support fairly long messages for the tunnel (249 + * bytes long at the moment). If we're talking to a 100 kHz device + * on the other end and need to transfer ~256 bytes, then we need: + * 10 us/bit * ~10 bits/byte * ~256 bytes = ~25ms + * + * We'll wait 8 times that to handle clock stretching and other + * paranoia. Note that some battery gas gauge ICs claim to have a + * clock stretch of 144ms in rare situations. That's incentive for + * not directly passing i2c through, but it's too late for that for + * existing hardware. + * + * It's pretty unlikely that we'll really see a 249 byte tunnel in + * anything other than testing. If this was more common we might + * consider having slow commands like this require a GET_STATUS + * wait loop. The 'flash write' command would be another candidate + * for this, clocking in at 2-3ms. + */ +#define EC_MSG_DEADLINE_MS 200 + +/* + * Time between raising the SPI chip select (for the end of a + * transaction) and dropping it again (for the next transaction). + * If we go too fast, the EC will miss the transaction. We know that we + * need at least 70 us with the 16 MHz STM32 EC, so go with 200 us to be + * safe. + */ +#define EC_SPI_RECOVERY_TIME_NS (200 * 1000) + +/** + * struct cros_ec_spi - information about a SPI-connected EC + * + * @spi: SPI device we are connected to + * @last_transfer_ns: time that we last finished a transfer. + * @start_of_msg_delay: used to set the delay_usecs on the spi_transfer that + * is sent when we want to turn on CS at the start of a transaction. + * @end_of_msg_delay: used to set the delay_usecs on the spi_transfer that + * is sent when we want to turn off CS at the end of a transaction. + */ +struct cros_ec_spi { + struct spi_device *spi; + s64 last_transfer_ns; + unsigned int start_of_msg_delay; + unsigned int end_of_msg_delay; +}; + +static void debug_packet(struct device *dev, const char *name, u8 *ptr, + int len) +{ +#ifdef DEBUG + int i; + + dev_dbg(dev, "%s: ", name); + for (i = 0; i < len; i++) + pr_cont(" %02x", ptr[i]); + + pr_cont("\n"); +#endif +} + +static int terminate_request(struct cros_ec_device *ec_dev) +{ + struct cros_ec_spi *ec_spi = ec_dev->priv; + struct spi_message msg; + struct spi_transfer trans; + int ret; + + /* + * Turn off CS, possibly adding a delay to ensure the rising edge + * doesn't come too soon after the end of the data. + */ + spi_message_init(&msg); + memset(&trans, 0, sizeof(trans)); + trans.delay_usecs = ec_spi->end_of_msg_delay; + spi_message_add_tail(&trans, &msg); + + ret = spi_sync_locked(ec_spi->spi, &msg); + + /* Reset end-of-response timer */ + ec_spi->last_transfer_ns = ktime_get_ns(); + if (ret < 0) { + dev_err(ec_dev->dev, + "cs-deassert spi transfer failed: %d\n", + ret); + } + + return ret; +} + +/** + * receive_n_bytes - receive n bytes from the EC. + * + * Assumes buf is a pointer into the ec_dev->din buffer + */ +static int receive_n_bytes(struct cros_ec_device *ec_dev, u8 *buf, int n) +{ + struct cros_ec_spi *ec_spi = ec_dev->priv; + struct spi_transfer trans; + struct spi_message msg; + int ret; + + BUG_ON(buf - ec_dev->din + n > ec_dev->din_size); + + memset(&trans, 0, sizeof(trans)); + trans.cs_change = 1; + trans.rx_buf = buf; + trans.len = n; + + spi_message_init(&msg); + spi_message_add_tail(&trans, &msg); + ret = spi_sync_locked(ec_spi->spi, &msg); + if (ret < 0) + dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret); + + return ret; +} + +/** + * cros_ec_spi_receive_packet - Receive a packet from the EC. + * + * This function has two phases: reading the preamble bytes (since if we read + * data from the EC before it is ready to send, we just get preamble) and + * reading the actual message. + * + * The received data is placed into ec_dev->din. + * + * @ec_dev: ChromeOS EC device + * @need_len: Number of message bytes we need to read + */ +static int cros_ec_spi_receive_packet(struct cros_ec_device *ec_dev, + int need_len) +{ + struct ec_host_response *response; + u8 *ptr, *end; + int ret; + unsigned long deadline; + int todo; + + BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT); + + /* Receive data until we see the header byte */ + deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS); + while (true) { + unsigned long start_jiffies = jiffies; + + ret = receive_n_bytes(ec_dev, + ec_dev->din, + EC_MSG_PREAMBLE_COUNT); + if (ret < 0) + return ret; + + ptr = ec_dev->din; + for (end = ptr + EC_MSG_PREAMBLE_COUNT; ptr != end; ptr++) { + if (*ptr == EC_SPI_FRAME_START) { + dev_dbg(ec_dev->dev, "msg found at %zd\n", + ptr - ec_dev->din); + break; + } + } + if (ptr != end) + break; + + /* + * Use the time at the start of the loop as a timeout. This + * gives us one last shot at getting the transfer and is useful + * in case we got context switched out for a while. + */ + if (time_after(start_jiffies, deadline)) { + dev_warn(ec_dev->dev, "EC failed to respond in time\n"); + return -ETIMEDOUT; + } + } + + /* + * ptr now points to the header byte. Copy any valid data to the + * start of our buffer + */ + todo = end - ++ptr; + BUG_ON(todo < 0 || todo > ec_dev->din_size); + todo = min(todo, need_len); + memmove(ec_dev->din, ptr, todo); + ptr = ec_dev->din + todo; + dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n", + need_len, todo); + need_len -= todo; + + /* If the entire response struct wasn't read, get the rest of it. */ + if (todo < sizeof(*response)) { + ret = receive_n_bytes(ec_dev, ptr, sizeof(*response) - todo); + if (ret < 0) + return -EBADMSG; + ptr += (sizeof(*response) - todo); + todo = sizeof(*response); + } + + response = (struct ec_host_response *)ec_dev->din; + + /* Abort if data_len is too large. */ + if (response->data_len > ec_dev->din_size) + return -EMSGSIZE; + + /* Receive data until we have it all */ + while (need_len > 0) { + /* + * We can't support transfers larger than the SPI FIFO size + * unless we have DMA. We don't have DMA on the ISP SPI ports + * for Exynos. We need a way of asking SPI driver for + * maximum-supported transfer size. + */ + todo = min(need_len, 256); + dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n", + todo, need_len, ptr - ec_dev->din); + + ret = receive_n_bytes(ec_dev, ptr, todo); + if (ret < 0) + return ret; + + ptr += todo; + need_len -= todo; + } + + dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din); + + return 0; +} + +/** + * cros_ec_spi_receive_response - Receive a response from the EC. + * + * This function has two phases: reading the preamble bytes (since if we read + * data from the EC before it is ready to send, we just get preamble) and + * reading the actual message. + * + * The received data is placed into ec_dev->din. + * + * @ec_dev: ChromeOS EC device + * @need_len: Number of message bytes we need to read + */ +static int cros_ec_spi_receive_response(struct cros_ec_device *ec_dev, + int need_len) +{ + u8 *ptr, *end; + int ret; + unsigned long deadline; + int todo; + + BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT); + + /* Receive data until we see the header byte */ + deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS); + while (true) { + unsigned long start_jiffies = jiffies; + + ret = receive_n_bytes(ec_dev, + ec_dev->din, + EC_MSG_PREAMBLE_COUNT); + if (ret < 0) + return ret; + + ptr = ec_dev->din; + for (end = ptr + EC_MSG_PREAMBLE_COUNT; ptr != end; ptr++) { + if (*ptr == EC_SPI_FRAME_START) { + dev_dbg(ec_dev->dev, "msg found at %zd\n", + ptr - ec_dev->din); + break; + } + } + if (ptr != end) + break; + + /* + * Use the time at the start of the loop as a timeout. This + * gives us one last shot at getting the transfer and is useful + * in case we got context switched out for a while. + */ + if (time_after(start_jiffies, deadline)) { + dev_warn(ec_dev->dev, "EC failed to respond in time\n"); + return -ETIMEDOUT; + } + } + + /* + * ptr now points to the header byte. Copy any valid data to the + * start of our buffer + */ + todo = end - ++ptr; + BUG_ON(todo < 0 || todo > ec_dev->din_size); + todo = min(todo, need_len); + memmove(ec_dev->din, ptr, todo); + ptr = ec_dev->din + todo; + dev_dbg(ec_dev->dev, "need %d, got %d bytes from preamble\n", + need_len, todo); + need_len -= todo; + + /* Receive data until we have it all */ + while (need_len > 0) { + /* + * We can't support transfers larger than the SPI FIFO size + * unless we have DMA. We don't have DMA on the ISP SPI ports + * for Exynos. We need a way of asking SPI driver for + * maximum-supported transfer size. + */ + todo = min(need_len, 256); + dev_dbg(ec_dev->dev, "loop, todo=%d, need_len=%d, ptr=%zd\n", + todo, need_len, ptr - ec_dev->din); + + ret = receive_n_bytes(ec_dev, ptr, todo); + if (ret < 0) + return ret; + + debug_packet(ec_dev->dev, "interim", ptr, todo); + ptr += todo; + need_len -= todo; + } + + dev_dbg(ec_dev->dev, "loop done, ptr=%zd\n", ptr - ec_dev->din); + + return 0; +} + +/** + * cros_ec_pkt_xfer_spi - Transfer a packet over SPI and receive the reply + * + * @ec_dev: ChromeOS EC device + * @ec_msg: Message to transfer + */ +static int cros_ec_pkt_xfer_spi(struct cros_ec_device *ec_dev, + struct cros_ec_command *ec_msg) +{ + struct ec_host_response *response; + struct cros_ec_spi *ec_spi = ec_dev->priv; + struct spi_transfer trans, trans_delay; + struct spi_message msg; + int i, len; + u8 *ptr; + u8 *rx_buf; + u8 sum; + u8 rx_byte; + int ret = 0, final_ret; + unsigned long delay; + + len = cros_ec_prepare_tx(ec_dev, ec_msg); + dev_dbg(ec_dev->dev, "prepared, len=%d\n", len); + + /* If it's too soon to do another transaction, wait */ + delay = ktime_get_ns() - ec_spi->last_transfer_ns; + if (delay < EC_SPI_RECOVERY_TIME_NS) + ndelay(EC_SPI_RECOVERY_TIME_NS - delay); + + rx_buf = kzalloc(len, GFP_KERNEL); + if (!rx_buf) + return -ENOMEM; + + spi_bus_lock(ec_spi->spi->master); + + /* + * Leave a gap between CS assertion and clocking of data to allow the + * EC time to wakeup. + */ + spi_message_init(&msg); + if (ec_spi->start_of_msg_delay) { + memset(&trans_delay, 0, sizeof(trans_delay)); + trans_delay.delay_usecs = ec_spi->start_of_msg_delay; + spi_message_add_tail(&trans_delay, &msg); + } + + /* Transmit phase - send our message */ + memset(&trans, 0, sizeof(trans)); + trans.tx_buf = ec_dev->dout; + trans.rx_buf = rx_buf; + trans.len = len; + trans.cs_change = 1; + spi_message_add_tail(&trans, &msg); + ret = spi_sync_locked(ec_spi->spi, &msg); + + /* Get the response */ + if (!ret) { + /* Verify that EC can process command */ + for (i = 0; i < len; i++) { + rx_byte = rx_buf[i]; + /* + * Seeing the PAST_END, RX_BAD_DATA, or NOT_READY + * markers are all signs that the EC didn't fully + * receive our command. e.g., if the EC is flashing + * itself, it can't respond to any commands and instead + * clocks out EC_SPI_PAST_END from its SPI hardware + * buffer. Similar occurrences can happen if the AP is + * too slow to clock out data after asserting CS -- the + * EC will abort and fill its buffer with + * EC_SPI_RX_BAD_DATA. + * + * In all cases, these errors should be safe to retry. + * Report -EAGAIN and let the caller decide what to do + * about that. + */ + if (rx_byte == EC_SPI_PAST_END || + rx_byte == EC_SPI_RX_BAD_DATA || + rx_byte == EC_SPI_NOT_READY) { + ret = -EAGAIN; + break; + } + } + } + + if (!ret) + ret = cros_ec_spi_receive_packet(ec_dev, + ec_msg->insize + sizeof(*response)); + else if (ret != -EAGAIN) + dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret); + + final_ret = terminate_request(ec_dev); + + spi_bus_unlock(ec_spi->spi->master); + + if (!ret) + ret = final_ret; + if (ret < 0) + goto exit; + + ptr = ec_dev->din; + + /* check response error code */ + response = (struct ec_host_response *)ptr; + ec_msg->result = response->result; + + ret = cros_ec_check_result(ec_dev, ec_msg); + if (ret) + goto exit; + + len = response->data_len; + sum = 0; + if (len > ec_msg->insize) { + dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", + len, ec_msg->insize); + ret = -EMSGSIZE; + goto exit; + } + + for (i = 0; i < sizeof(*response); i++) + sum += ptr[i]; + + /* copy response packet payload and compute checksum */ + memcpy(ec_msg->data, ptr + sizeof(*response), len); + for (i = 0; i < len; i++) + sum += ec_msg->data[i]; + + if (sum) { + dev_err(ec_dev->dev, + "bad packet checksum, calculated %x\n", + sum); + ret = -EBADMSG; + goto exit; + } + + ret = len; +exit: + kfree(rx_buf); + if (ec_msg->command == EC_CMD_REBOOT_EC) + msleep(EC_REBOOT_DELAY_MS); + + return ret; +} + +/** + * cros_ec_cmd_xfer_spi - Transfer a message over SPI and receive the reply + * + * @ec_dev: ChromeOS EC device + * @ec_msg: Message to transfer + */ +static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev, + struct cros_ec_command *ec_msg) +{ + struct cros_ec_spi *ec_spi = ec_dev->priv; + struct spi_transfer trans; + struct spi_message msg; + int i, len; + u8 *ptr; + u8 *rx_buf; + u8 rx_byte; + int sum; + int ret = 0, final_ret; + unsigned long delay; + + len = cros_ec_prepare_tx(ec_dev, ec_msg); + dev_dbg(ec_dev->dev, "prepared, len=%d\n", len); + + /* If it's too soon to do another transaction, wait */ + delay = ktime_get_ns() - ec_spi->last_transfer_ns; + if (delay < EC_SPI_RECOVERY_TIME_NS) + ndelay(EC_SPI_RECOVERY_TIME_NS - delay); + + rx_buf = kzalloc(len, GFP_KERNEL); + if (!rx_buf) + return -ENOMEM; + + spi_bus_lock(ec_spi->spi->master); + + /* Transmit phase - send our message */ + debug_packet(ec_dev->dev, "out", ec_dev->dout, len); + memset(&trans, 0, sizeof(trans)); + trans.tx_buf = ec_dev->dout; + trans.rx_buf = rx_buf; + trans.len = len; + trans.cs_change = 1; + spi_message_init(&msg); + spi_message_add_tail(&trans, &msg); + ret = spi_sync_locked(ec_spi->spi, &msg); + + /* Get the response */ + if (!ret) { + /* Verify that EC can process command */ + for (i = 0; i < len; i++) { + rx_byte = rx_buf[i]; + /* See comments in cros_ec_pkt_xfer_spi() */ + if (rx_byte == EC_SPI_PAST_END || + rx_byte == EC_SPI_RX_BAD_DATA || + rx_byte == EC_SPI_NOT_READY) { + ret = -EAGAIN; + break; + } + } + } + + if (!ret) + ret = cros_ec_spi_receive_response(ec_dev, + ec_msg->insize + EC_MSG_TX_PROTO_BYTES); + else if (ret != -EAGAIN) + dev_err(ec_dev->dev, "spi transfer failed: %d\n", ret); + + final_ret = terminate_request(ec_dev); + + spi_bus_unlock(ec_spi->spi->master); + + if (!ret) + ret = final_ret; + if (ret < 0) + goto exit; + + ptr = ec_dev->din; + + /* check response error code */ + ec_msg->result = ptr[0]; + ret = cros_ec_check_result(ec_dev, ec_msg); + if (ret) + goto exit; + + len = ptr[1]; + sum = ptr[0] + ptr[1]; + if (len > ec_msg->insize) { + dev_err(ec_dev->dev, "packet too long (%d bytes, expected %d)", + len, ec_msg->insize); + ret = -ENOSPC; + goto exit; + } + + /* copy response packet payload and compute checksum */ + for (i = 0; i < len; i++) { + sum += ptr[i + 2]; + if (ec_msg->insize) + ec_msg->data[i] = ptr[i + 2]; + } + sum &= 0xff; + + debug_packet(ec_dev->dev, "in", ptr, len + 3); + + if (sum != ptr[len + 2]) { + dev_err(ec_dev->dev, + "bad packet checksum, expected %02x, got %02x\n", + sum, ptr[len + 2]); + ret = -EBADMSG; + goto exit; + } + + ret = len; +exit: + kfree(rx_buf); + if (ec_msg->command == EC_CMD_REBOOT_EC) + msleep(EC_REBOOT_DELAY_MS); + + return ret; +} + +static void cros_ec_spi_dt_probe(struct cros_ec_spi *ec_spi, struct device *dev) +{ + struct device_node *np = dev->of_node; + u32 val; + int ret; + + ret = of_property_read_u32(np, "google,cros-ec-spi-pre-delay", &val); + if (!ret) + ec_spi->start_of_msg_delay = val; + + ret = of_property_read_u32(np, "google,cros-ec-spi-msg-delay", &val); + if (!ret) + ec_spi->end_of_msg_delay = val; +} + +static int cros_ec_spi_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct cros_ec_device *ec_dev; + struct cros_ec_spi *ec_spi; + int err; + + spi->bits_per_word = 8; + spi->mode = SPI_MODE_0; + err = spi_setup(spi); + if (err < 0) + return err; + + ec_spi = devm_kzalloc(dev, sizeof(*ec_spi), GFP_KERNEL); + if (ec_spi == NULL) + return -ENOMEM; + ec_spi->spi = spi; + ec_dev = devm_kzalloc(dev, sizeof(*ec_dev), GFP_KERNEL); + if (!ec_dev) + return -ENOMEM; + + /* Check for any DT properties */ + cros_ec_spi_dt_probe(ec_spi, dev); + + spi_set_drvdata(spi, ec_dev); + ec_dev->dev = dev; + ec_dev->priv = ec_spi; + ec_dev->irq = spi->irq; + ec_dev->cmd_xfer = cros_ec_cmd_xfer_spi; + ec_dev->pkt_xfer = cros_ec_pkt_xfer_spi; + ec_dev->phys_name = dev_name(&ec_spi->spi->dev); + ec_dev->din_size = EC_MSG_PREAMBLE_COUNT + + sizeof(struct ec_host_response) + + sizeof(struct ec_response_get_protocol_info); + ec_dev->dout_size = sizeof(struct ec_host_request); + + ec_spi->last_transfer_ns = ktime_get_ns(); + + err = cros_ec_register(ec_dev); + if (err) { + dev_err(dev, "cannot register EC\n"); + return err; + } + + device_init_wakeup(&spi->dev, true); + + return 0; +} + +static int cros_ec_spi_remove(struct spi_device *spi) +{ + struct cros_ec_device *ec_dev; + + ec_dev = spi_get_drvdata(spi); + cros_ec_remove(ec_dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int cros_ec_spi_suspend(struct device *dev) +{ + struct cros_ec_device *ec_dev = dev_get_drvdata(dev); + + return cros_ec_suspend(ec_dev); +} + +static int cros_ec_spi_resume(struct device *dev) +{ + struct cros_ec_device *ec_dev = dev_get_drvdata(dev); + + return cros_ec_resume(ec_dev); +} +#endif + +static SIMPLE_DEV_PM_OPS(cros_ec_spi_pm_ops, cros_ec_spi_suspend, + cros_ec_spi_resume); + +static const struct of_device_id cros_ec_spi_of_match[] = { + { .compatible = "google,cros-ec-spi", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, cros_ec_spi_of_match); + +static const struct spi_device_id cros_ec_spi_id[] = { + { "cros-ec-spi", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, cros_ec_spi_id); + +static struct spi_driver cros_ec_driver_spi = { + .driver = { + .name = "cros-ec-spi", + .of_match_table = of_match_ptr(cros_ec_spi_of_match), + .pm = &cros_ec_spi_pm_ops, + }, + .probe = cros_ec_spi_probe, + .remove = cros_ec_spi_remove, + .id_table = cros_ec_spi_id, +}; + +module_spi_driver(cros_ec_driver_spi); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("ChromeOS EC multi function device (SPI)"); diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c new file mode 100644 index 000000000..f34a50121 --- /dev/null +++ b/drivers/platform/chrome/cros_ec_sysfs.c @@ -0,0 +1,359 @@ +/* + * cros_ec_sysfs - expose the Chrome OS EC through sysfs + * + * Copyright (C) 2014 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#define pr_fmt(fmt) "cros_ec_sysfs: " fmt + +#include <linux/ctype.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/kobject.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/printk.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/types.h> +#include <linux/uaccess.h> + +/* Accessor functions */ + +static ssize_t reboot_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int count = 0; + + count += scnprintf(buf + count, PAGE_SIZE - count, + "ro|rw|cancel|cold|disable-jump|hibernate"); + count += scnprintf(buf + count, PAGE_SIZE - count, + " [at-shutdown]\n"); + return count; +} + +static ssize_t reboot_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + static const struct { + const char * const str; + uint8_t cmd; + uint8_t flags; + } words[] = { + {"cancel", EC_REBOOT_CANCEL, 0}, + {"ro", EC_REBOOT_JUMP_RO, 0}, + {"rw", EC_REBOOT_JUMP_RW, 0}, + {"cold", EC_REBOOT_COLD, 0}, + {"disable-jump", EC_REBOOT_DISABLE_JUMP, 0}, + {"hibernate", EC_REBOOT_HIBERNATE, 0}, + {"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN}, + }; + struct cros_ec_command *msg; + struct ec_params_reboot_ec *param; + int got_cmd = 0, offset = 0; + int i; + int ret; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_reboot_ec *)msg->data; + + param->flags = 0; + while (1) { + /* Find word to start scanning */ + while (buf[offset] && isspace(buf[offset])) + offset++; + if (!buf[offset]) + break; + + for (i = 0; i < ARRAY_SIZE(words); i++) { + if (!strncasecmp(words[i].str, buf+offset, + strlen(words[i].str))) { + if (words[i].flags) { + param->flags |= words[i].flags; + } else { + param->cmd = words[i].cmd; + got_cmd = 1; + } + break; + } + } + + /* On to the next word, if any */ + while (buf[offset] && !isspace(buf[offset])) + offset++; + } + + if (!got_cmd) { + count = -EINVAL; + goto exit; + } + + msg->version = 0; + msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset; + msg->outsize = sizeof(*param); + msg->insize = 0; + ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); + if (ret < 0) + count = ret; +exit: + kfree(msg); + return count; +} + +static ssize_t version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + static const char * const image_names[] = {"unknown", "RO", "RW"}; + struct ec_response_get_version *r_ver; + struct ec_response_get_chip_info *r_chip; + struct ec_response_board_version *r_board; + struct cros_ec_command *msg; + int ret; + int count = 0; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + /* Get versions. RW may change. */ + msg->version = 0; + msg->command = EC_CMD_GET_VERSION + ec->cmd_offset; + msg->insize = sizeof(*r_ver); + msg->outsize = 0; + ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); + if (ret < 0) { + count = ret; + goto exit; + } + r_ver = (struct ec_response_get_version *)msg->data; + /* Strings should be null-terminated, but let's be sure. */ + r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0'; + r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0'; + count += scnprintf(buf + count, PAGE_SIZE - count, + "RO version: %s\n", r_ver->version_string_ro); + count += scnprintf(buf + count, PAGE_SIZE - count, + "RW version: %s\n", r_ver->version_string_rw); + count += scnprintf(buf + count, PAGE_SIZE - count, + "Firmware copy: %s\n", + (r_ver->current_image < ARRAY_SIZE(image_names) ? + image_names[r_ver->current_image] : "?")); + + /* Get build info. */ + msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset; + msg->insize = EC_HOST_PARAM_SIZE; + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Build info: XFER ERROR %d\n", ret); + else if (msg->result != EC_RES_SUCCESS) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Build info: EC error %d\n", msg->result); + else { + msg->data[EC_HOST_PARAM_SIZE - 1] = '\0'; + count += scnprintf(buf + count, PAGE_SIZE - count, + "Build info: %s\n", msg->data); + } + + /* Get chip info. */ + msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset; + msg->insize = sizeof(*r_chip); + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip info: XFER ERROR %d\n", ret); + else if (msg->result != EC_RES_SUCCESS) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip info: EC error %d\n", msg->result); + else { + r_chip = (struct ec_response_get_chip_info *)msg->data; + + r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0'; + r_chip->name[sizeof(r_chip->name) - 1] = '\0'; + r_chip->revision[sizeof(r_chip->revision) - 1] = '\0'; + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip vendor: %s\n", r_chip->vendor); + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip name: %s\n", r_chip->name); + count += scnprintf(buf + count, PAGE_SIZE - count, + "Chip revision: %s\n", r_chip->revision); + } + + /* Get board version */ + msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset; + msg->insize = sizeof(*r_board); + ret = cros_ec_cmd_xfer(ec->ec_dev, msg); + if (ret < 0) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Board version: XFER ERROR %d\n", ret); + else if (msg->result != EC_RES_SUCCESS) + count += scnprintf(buf + count, PAGE_SIZE - count, + "Board version: EC error %d\n", msg->result); + else { + r_board = (struct ec_response_board_version *)msg->data; + + count += scnprintf(buf + count, PAGE_SIZE - count, + "Board version: %d\n", + r_board->board_version); + } + +exit: + kfree(msg); + return count; +} + +static ssize_t flashinfo_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ec_response_flash_info *resp; + struct cros_ec_command *msg; + int ret; + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL); + if (!msg) + return -ENOMEM; + + /* The flash info shouldn't ever change, but ask each time anyway. */ + msg->version = 0; + msg->command = EC_CMD_FLASH_INFO + ec->cmd_offset; + msg->insize = sizeof(*resp); + msg->outsize = 0; + ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); + if (ret < 0) + goto exit; + + resp = (struct ec_response_flash_info *)msg->data; + + ret = scnprintf(buf, PAGE_SIZE, + "FlashSize %d\nWriteSize %d\n" + "EraseSize %d\nProtectSize %d\n", + resp->flash_size, resp->write_block_size, + resp->erase_block_size, resp->protect_block_size); +exit: + kfree(msg); + return ret; +} + +/* Keyboard wake angle control */ +static ssize_t kb_wake_angle_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + struct ec_response_motion_sense *resp; + struct ec_params_motion_sense *param; + struct cros_ec_command *msg; + int ret; + + msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_motion_sense *)msg->data; + msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; + msg->version = 2; + param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; + param->kb_wake_angle.data = EC_MOTION_SENSE_NO_VALUE; + msg->outsize = sizeof(*param); + msg->insize = sizeof(*resp); + + ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); + if (ret < 0) + goto exit; + + resp = (struct ec_response_motion_sense *)msg->data; + ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->kb_wake_angle.ret); +exit: + kfree(msg); + return ret; +} + +static ssize_t kb_wake_angle_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + struct ec_params_motion_sense *param; + struct cros_ec_command *msg; + u16 angle; + int ret; + + ret = kstrtou16(buf, 0, &angle); + if (ret) + return ret; + + msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + param = (struct ec_params_motion_sense *)msg->data; + msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; + msg->version = 2; + param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; + param->kb_wake_angle.data = angle; + msg->outsize = sizeof(*param); + msg->insize = sizeof(struct ec_response_motion_sense); + + ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); + kfree(msg); + if (ret < 0) + return ret; + return count; +} + +/* Module initialization */ + +static DEVICE_ATTR_RW(reboot); +static DEVICE_ATTR_RO(version); +static DEVICE_ATTR_RO(flashinfo); +static DEVICE_ATTR_RW(kb_wake_angle); + +static struct attribute *__ec_attrs[] = { + &dev_attr_kb_wake_angle.attr, + &dev_attr_reboot.attr, + &dev_attr_version.attr, + &dev_attr_flashinfo.attr, + NULL, +}; + +static umode_t cros_ec_ctrl_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + + if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle) + return 0; + + return a->mode; +} + +struct attribute_group cros_ec_attr_group = { + .attrs = __ec_attrs, + .is_visible = cros_ec_ctrl_visible, +}; +EXPORT_SYMBOL(cros_ec_attr_group); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ChromeOS EC control driver"); diff --git a/drivers/platform/chrome/cros_ec_vbc.c b/drivers/platform/chrome/cros_ec_vbc.c new file mode 100644 index 000000000..5356f26bc --- /dev/null +++ b/drivers/platform/chrome/cros_ec_vbc.c @@ -0,0 +1,135 @@ +/* + * cros_ec_vbc - Expose the vboot context nvram to userspace + * + * Copyright (C) 2015 Collabora Ltd. + * + * based on vendor driver, + * + * Copyright (C) 2012 The Chromium OS Authors + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/mfd/cros_ec.h> +#include <linux/mfd/cros_ec_commands.h> +#include <linux/slab.h> + +static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *att, char *buf, + loff_t pos, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + struct cros_ec_device *ecdev = ec->ec_dev; + struct ec_params_vbnvcontext *params; + struct cros_ec_command *msg; + int err; + const size_t para_sz = sizeof(params->op); + const size_t resp_sz = sizeof(struct ec_response_vbnvcontext); + const size_t payload = max(para_sz, resp_sz); + + msg = kmalloc(sizeof(*msg) + payload, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + /* NB: we only kmalloc()ated enough space for the op field */ + params = (struct ec_params_vbnvcontext *)msg->data; + params->op = EC_VBNV_CONTEXT_OP_READ; + + msg->version = EC_VER_VBNV_CONTEXT; + msg->command = EC_CMD_VBNV_CONTEXT; + msg->outsize = para_sz; + msg->insize = resp_sz; + + err = cros_ec_cmd_xfer(ecdev, msg); + if (err < 0) { + dev_err(dev, "Error sending read request: %d\n", err); + kfree(msg); + return err; + } + + memcpy(buf, msg->data, resp_sz); + + kfree(msg); + return resp_sz; +} + +static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj, + struct bin_attribute *attr, char *buf, + loff_t pos, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + struct cros_ec_device *ecdev = ec->ec_dev; + struct ec_params_vbnvcontext *params; + struct cros_ec_command *msg; + int err; + const size_t para_sz = sizeof(*params); + const size_t data_sz = sizeof(params->block); + + /* Only write full values */ + if (count != data_sz) + return -EINVAL; + + msg = kmalloc(sizeof(*msg) + para_sz, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + params = (struct ec_params_vbnvcontext *)msg->data; + params->op = EC_VBNV_CONTEXT_OP_WRITE; + memcpy(params->block, buf, data_sz); + + msg->version = EC_VER_VBNV_CONTEXT; + msg->command = EC_CMD_VBNV_CONTEXT; + msg->outsize = para_sz; + msg->insize = 0; + + err = cros_ec_cmd_xfer(ecdev, msg); + if (err < 0) { + dev_err(dev, "Error sending write request: %d\n", err); + kfree(msg); + return err; + } + + kfree(msg); + return data_sz; +} + +static umode_t cros_ec_vbc_is_visible(struct kobject *kobj, + struct bin_attribute *a, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_dev *ec = to_cros_ec_dev(dev); + struct device_node *np = ec->ec_dev->dev->of_node; + + if (IS_ENABLED(CONFIG_OF) && np) { + if (of_property_read_bool(np, "google,has-vbc-nvram")) + return a->attr.mode; + } + + return 0; +} + +static BIN_ATTR_RW(vboot_context, 16); + +static struct bin_attribute *cros_ec_vbc_bin_attrs[] = { + &bin_attr_vboot_context, + NULL +}; + +struct attribute_group cros_ec_vbc_attr_group = { + .name = "vbc", + .bin_attrs = cros_ec_vbc_bin_attrs, + .is_bin_visible = cros_ec_vbc_is_visible, +}; +EXPORT_SYMBOL(cros_ec_vbc_attr_group); diff --git a/drivers/platform/chrome/cros_kbd_led_backlight.c b/drivers/platform/chrome/cros_kbd_led_backlight.c new file mode 100644 index 000000000..ca3e4da85 --- /dev/null +++ b/drivers/platform/chrome/cros_kbd_led_backlight.c @@ -0,0 +1,122 @@ +/* + * Keyboard backlight LED driver for Chrome OS. + * + * Copyright (C) 2012 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/acpi.h> +#include <linux/leds.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +/* Keyboard LED ACPI Device must be defined in firmware */ +#define ACPI_KEYBOARD_BACKLIGHT_DEVICE "\\_SB.KBLT" +#define ACPI_KEYBOARD_BACKLIGHT_READ ACPI_KEYBOARD_BACKLIGHT_DEVICE ".KBQC" +#define ACPI_KEYBOARD_BACKLIGHT_WRITE ACPI_KEYBOARD_BACKLIGHT_DEVICE ".KBCM" + +#define ACPI_KEYBOARD_BACKLIGHT_MAX 100 + +static void keyboard_led_set_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + union acpi_object param; + struct acpi_object_list input; + acpi_status status; + + param.type = ACPI_TYPE_INTEGER; + param.integer.value = brightness; + input.count = 1; + input.pointer = ¶m; + + status = acpi_evaluate_object(NULL, ACPI_KEYBOARD_BACKLIGHT_WRITE, + &input, NULL); + if (ACPI_FAILURE(status)) + dev_err(cdev->dev, "Error setting keyboard LED value: %d\n", + status); +} + +static enum led_brightness +keyboard_led_get_brightness(struct led_classdev *cdev) +{ + unsigned long long brightness; + acpi_status status; + + status = acpi_evaluate_integer(NULL, ACPI_KEYBOARD_BACKLIGHT_READ, + NULL, &brightness); + if (ACPI_FAILURE(status)) { + dev_err(cdev->dev, "Error getting keyboard LED value: %d\n", + status); + return -EIO; + } + + return brightness; +} + +static int keyboard_led_probe(struct platform_device *pdev) +{ + struct led_classdev *cdev; + acpi_handle handle; + acpi_status status; + int error; + + /* Look for the keyboard LED ACPI Device */ + status = acpi_get_handle(ACPI_ROOT_OBJECT, + ACPI_KEYBOARD_BACKLIGHT_DEVICE, + &handle); + if (ACPI_FAILURE(status)) { + dev_err(&pdev->dev, "Unable to find ACPI device %s: %d\n", + ACPI_KEYBOARD_BACKLIGHT_DEVICE, status); + return -ENXIO; + } + + cdev = devm_kzalloc(&pdev->dev, sizeof(*cdev), GFP_KERNEL); + if (!cdev) + return -ENOMEM; + + cdev->name = "chromeos::kbd_backlight"; + cdev->max_brightness = ACPI_KEYBOARD_BACKLIGHT_MAX; + cdev->flags |= LED_CORE_SUSPENDRESUME; + cdev->brightness_set = keyboard_led_set_brightness; + cdev->brightness_get = keyboard_led_get_brightness; + + error = devm_led_classdev_register(&pdev->dev, cdev); + if (error) + return error; + + return 0; +} + +static const struct acpi_device_id keyboard_led_id[] = { + { "GOOG0002", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, keyboard_led_id); + +static struct platform_driver keyboard_led_driver = { + .driver = { + .name = "chromeos-keyboard-leds", + .acpi_match_table = ACPI_PTR(keyboard_led_id), + }, + .probe = keyboard_led_probe, +}; +module_platform_driver(keyboard_led_driver); + +MODULE_AUTHOR("Simon Que <sque@chromium.org>"); +MODULE_DESCRIPTION("ChromeOS Keyboard backlight LED Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:chromeos-keyboard-leds"); |