diff options
Diffstat (limited to 'drivers/platform/x86/system76_acpi.c')
| -rw-r--r-- | drivers/platform/x86/system76_acpi.c | 781 |
1 files changed, 781 insertions, 0 deletions
diff --git a/drivers/platform/x86/system76_acpi.c b/drivers/platform/x86/system76_acpi.c new file mode 100644 index 000000000..958df41ad --- /dev/null +++ b/drivers/platform/x86/system76_acpi.c @@ -0,0 +1,781 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * System76 ACPI Driver + * + * Copyright (C) 2019 System76 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/init.h> +#include <linux/input.h> +#include <linux/kernel.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/pci_ids.h> +#include <linux/power_supply.h> +#include <linux/sysfs.h> +#include <linux/types.h> + +#include <acpi/battery.h> + +struct system76_data { + struct acpi_device *acpi_dev; + struct led_classdev ap_led; + struct led_classdev kb_led; + enum led_brightness kb_brightness; + enum led_brightness kb_toggle_brightness; + int kb_color; + struct device *therm; + union acpi_object *nfan; + union acpi_object *ntmp; + struct input_dev *input; + bool has_open_ec; +}; + +static const struct acpi_device_id device_ids[] = { + {"17761776", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, device_ids); + +// Array of keyboard LED brightness levels +static const enum led_brightness kb_levels[] = { + 48, + 72, + 96, + 144, + 192, + 255 +}; + +// Array of keyboard LED colors in 24-bit RGB format +static const int kb_colors[] = { + 0xFFFFFF, + 0x0000FF, + 0xFF0000, + 0xFF00FF, + 0x00FF00, + 0x00FFFF, + 0xFFFF00 +}; + +// Get a System76 ACPI device value by name +static int system76_get(struct system76_data *data, char *method) +{ + acpi_handle handle; + acpi_status status; + unsigned long long ret = 0; + + handle = acpi_device_handle(data->acpi_dev); + status = acpi_evaluate_integer(handle, method, NULL, &ret); + if (ACPI_SUCCESS(status)) + return ret; + return -ENODEV; +} + +// Get a System76 ACPI device value by name with index +static int system76_get_index(struct system76_data *data, char *method, int index) +{ + union acpi_object obj; + struct acpi_object_list obj_list; + acpi_handle handle; + acpi_status status; + unsigned long long ret = 0; + + obj.type = ACPI_TYPE_INTEGER; + obj.integer.value = index; + obj_list.count = 1; + obj_list.pointer = &obj; + + handle = acpi_device_handle(data->acpi_dev); + status = acpi_evaluate_integer(handle, method, &obj_list, &ret); + if (ACPI_SUCCESS(status)) + return ret; + return -ENODEV; +} + +// Get a System76 ACPI device object by name +static int system76_get_object(struct system76_data *data, char *method, union acpi_object **obj) +{ + acpi_handle handle; + acpi_status status; + struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; + + handle = acpi_device_handle(data->acpi_dev); + status = acpi_evaluate_object(handle, method, NULL, &buf); + if (ACPI_SUCCESS(status)) { + *obj = buf.pointer; + return 0; + } + + return -ENODEV; +} + +// Get a name from a System76 ACPI device object +static char *system76_name(union acpi_object *obj, int index) +{ + if (obj && obj->type == ACPI_TYPE_PACKAGE && index <= obj->package.count) { + if (obj->package.elements[index].type == ACPI_TYPE_STRING) + return obj->package.elements[index].string.pointer; + } + + return NULL; +} + +// Set a System76 ACPI device value by name +static int system76_set(struct system76_data *data, char *method, int value) +{ + union acpi_object obj; + struct acpi_object_list obj_list; + acpi_handle handle; + acpi_status status; + + obj.type = ACPI_TYPE_INTEGER; + obj.integer.value = value; + obj_list.count = 1; + obj_list.pointer = &obj; + handle = acpi_device_handle(data->acpi_dev); + status = acpi_evaluate_object(handle, method, &obj_list, NULL); + if (ACPI_SUCCESS(status)) + return 0; + else + return -1; +} + +#define BATTERY_THRESHOLD_INVALID 0xFF + +enum { + THRESHOLD_START, + THRESHOLD_END, +}; + +static ssize_t battery_get_threshold(int which, char *buf) +{ + struct acpi_object_list input; + union acpi_object param; + acpi_handle handle; + acpi_status status; + unsigned long long ret = BATTERY_THRESHOLD_INVALID; + + handle = ec_get_handle(); + if (!handle) + return -ENODEV; + + input.count = 1; + input.pointer = ¶m; + // Start/stop selection + param.type = ACPI_TYPE_INTEGER; + param.integer.value = which; + + status = acpi_evaluate_integer(handle, "GBCT", &input, &ret); + if (ACPI_FAILURE(status)) + return -EIO; + if (ret == BATTERY_THRESHOLD_INVALID) + return -EINVAL; + + return sysfs_emit(buf, "%d\n", (int)ret); +} + +static ssize_t battery_set_threshold(int which, const char *buf, size_t count) +{ + struct acpi_object_list input; + union acpi_object params[2]; + acpi_handle handle; + acpi_status status; + unsigned int value; + int ret; + + handle = ec_get_handle(); + if (!handle) + return -ENODEV; + + ret = kstrtouint(buf, 10, &value); + if (ret) + return ret; + + if (value > 100) + return -EINVAL; + + input.count = 2; + input.pointer = params; + // Start/stop selection + params[0].type = ACPI_TYPE_INTEGER; + params[0].integer.value = which; + // Threshold value + params[1].type = ACPI_TYPE_INTEGER; + params[1].integer.value = value; + + status = acpi_evaluate_object(handle, "SBCT", &input, NULL); + if (ACPI_FAILURE(status)) + return -EIO; + + return count; +} + +static ssize_t charge_control_start_threshold_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return battery_get_threshold(THRESHOLD_START, buf); +} + +static ssize_t charge_control_start_threshold_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + return battery_set_threshold(THRESHOLD_START, buf, count); +} + +static DEVICE_ATTR_RW(charge_control_start_threshold); + +static ssize_t charge_control_end_threshold_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return battery_get_threshold(THRESHOLD_END, buf); +} + +static ssize_t charge_control_end_threshold_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + return battery_set_threshold(THRESHOLD_END, buf, count); +} + +static DEVICE_ATTR_RW(charge_control_end_threshold); + +static struct attribute *system76_battery_attrs[] = { + &dev_attr_charge_control_start_threshold.attr, + &dev_attr_charge_control_end_threshold.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(system76_battery); + +static int system76_battery_add(struct power_supply *battery) +{ + // System76 EC only supports 1 battery + if (strcmp(battery->desc->name, "BAT0") != 0) + return -ENODEV; + + if (device_add_groups(&battery->dev, system76_battery_groups)) + return -ENODEV; + + return 0; +} + +static int system76_battery_remove(struct power_supply *battery) +{ + device_remove_groups(&battery->dev, system76_battery_groups); + return 0; +} + +static struct acpi_battery_hook system76_battery_hook = { + .add_battery = system76_battery_add, + .remove_battery = system76_battery_remove, + .name = "System76 Battery Extension", +}; + +static void system76_battery_init(void) +{ + battery_hook_register(&system76_battery_hook); +} + +static void system76_battery_exit(void) +{ + battery_hook_unregister(&system76_battery_hook); +} + +// Get the airplane mode LED brightness +static enum led_brightness ap_led_get(struct led_classdev *led) +{ + struct system76_data *data; + int value; + + data = container_of(led, struct system76_data, ap_led); + value = system76_get(data, "GAPL"); + if (value > 0) + return (enum led_brightness)value; + else + return LED_OFF; +} + +// Set the airplane mode LED brightness +static int ap_led_set(struct led_classdev *led, enum led_brightness value) +{ + struct system76_data *data; + + data = container_of(led, struct system76_data, ap_led); + return system76_set(data, "SAPL", value == LED_OFF ? 0 : 1); +} + +// Get the last set keyboard LED brightness +static enum led_brightness kb_led_get(struct led_classdev *led) +{ + struct system76_data *data; + + data = container_of(led, struct system76_data, kb_led); + return data->kb_brightness; +} + +// Set the keyboard LED brightness +static int kb_led_set(struct led_classdev *led, enum led_brightness value) +{ + struct system76_data *data; + + data = container_of(led, struct system76_data, kb_led); + data->kb_brightness = value; + return system76_set(data, "SKBL", (int)data->kb_brightness); +} + +// Get the last set keyboard LED color +static ssize_t kb_led_color_show( + struct device *dev, + struct device_attribute *dev_attr, + char *buf) +{ + struct led_classdev *led; + struct system76_data *data; + + led = dev_get_drvdata(dev); + data = container_of(led, struct system76_data, kb_led); + return sysfs_emit(buf, "%06X\n", data->kb_color); +} + +// Set the keyboard LED color +static ssize_t kb_led_color_store( + struct device *dev, + struct device_attribute *dev_attr, + const char *buf, + size_t size) +{ + struct led_classdev *led; + struct system76_data *data; + unsigned int val; + int ret; + + led = dev_get_drvdata(dev); + data = container_of(led, struct system76_data, kb_led); + ret = kstrtouint(buf, 16, &val); + if (ret) + return ret; + if (val > 0xFFFFFF) + return -EINVAL; + data->kb_color = (int)val; + system76_set(data, "SKBC", data->kb_color); + + return size; +} + +static struct device_attribute dev_attr_kb_led_color = { + .attr = { + .name = "color", + .mode = 0644, + }, + .show = kb_led_color_show, + .store = kb_led_color_store, +}; + +static struct attribute *system76_kb_led_color_attrs[] = { + &dev_attr_kb_led_color.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(system76_kb_led_color); + +// Notify that the keyboard LED was changed by hardware +static void kb_led_notify(struct system76_data *data) +{ + led_classdev_notify_brightness_hw_changed( + &data->kb_led, + data->kb_brightness + ); +} + +// Read keyboard LED brightness as set by hardware +static void kb_led_hotkey_hardware(struct system76_data *data) +{ + int value; + + value = system76_get(data, "GKBL"); + if (value < 0) + return; + data->kb_brightness = value; + kb_led_notify(data); +} + +// Toggle the keyboard LED +static void kb_led_hotkey_toggle(struct system76_data *data) +{ + if (data->kb_brightness > 0) { + data->kb_toggle_brightness = data->kb_brightness; + kb_led_set(&data->kb_led, 0); + } else { + kb_led_set(&data->kb_led, data->kb_toggle_brightness); + } + kb_led_notify(data); +} + +// Decrease the keyboard LED brightness +static void kb_led_hotkey_down(struct system76_data *data) +{ + int i; + + if (data->kb_brightness > 0) { + for (i = ARRAY_SIZE(kb_levels); i > 0; i--) { + if (kb_levels[i - 1] < data->kb_brightness) { + kb_led_set(&data->kb_led, kb_levels[i - 1]); + break; + } + } + } else { + kb_led_set(&data->kb_led, data->kb_toggle_brightness); + } + kb_led_notify(data); +} + +// Increase the keyboard LED brightness +static void kb_led_hotkey_up(struct system76_data *data) +{ + int i; + + if (data->kb_brightness > 0) { + for (i = 0; i < ARRAY_SIZE(kb_levels); i++) { + if (kb_levels[i] > data->kb_brightness) { + kb_led_set(&data->kb_led, kb_levels[i]); + break; + } + } + } else { + kb_led_set(&data->kb_led, data->kb_toggle_brightness); + } + kb_led_notify(data); +} + +// Cycle the keyboard LED color +static void kb_led_hotkey_color(struct system76_data *data) +{ + int i; + + if (data->kb_color < 0) + return; + if (data->kb_brightness > 0) { + for (i = 0; i < ARRAY_SIZE(kb_colors); i++) { + if (kb_colors[i] == data->kb_color) + break; + } + i += 1; + if (i >= ARRAY_SIZE(kb_colors)) + i = 0; + data->kb_color = kb_colors[i]; + system76_set(data, "SKBC", data->kb_color); + } else { + kb_led_set(&data->kb_led, data->kb_toggle_brightness); + } + kb_led_notify(data); +} + +static umode_t thermal_is_visible(const void *drvdata, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + const struct system76_data *data = drvdata; + + switch (type) { + case hwmon_fan: + case hwmon_pwm: + if (system76_name(data->nfan, channel)) + return 0444; + break; + + case hwmon_temp: + if (system76_name(data->ntmp, channel)) + return 0444; + break; + + default: + return 0; + } + + return 0; +} + +static int thermal_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, long *val) +{ + struct system76_data *data = dev_get_drvdata(dev); + int raw; + + switch (type) { + case hwmon_fan: + if (attr == hwmon_fan_input) { + raw = system76_get_index(data, "GFAN", channel); + if (raw < 0) + return raw; + *val = (raw >> 8) & 0xFFFF; + return 0; + } + break; + + case hwmon_pwm: + if (attr == hwmon_pwm_input) { + raw = system76_get_index(data, "GFAN", channel); + if (raw < 0) + return raw; + *val = raw & 0xFF; + return 0; + } + break; + + case hwmon_temp: + if (attr == hwmon_temp_input) { + raw = system76_get_index(data, "GTMP", channel); + if (raw < 0) + return raw; + *val = raw * 1000; + return 0; + } + break; + + default: + return -EOPNOTSUPP; + } + + return -EOPNOTSUPP; +} + +static int thermal_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, + int channel, const char **str) +{ + struct system76_data *data = dev_get_drvdata(dev); + + switch (type) { + case hwmon_fan: + if (attr == hwmon_fan_label) { + *str = system76_name(data->nfan, channel); + if (*str) + return 0; + } + break; + + case hwmon_temp: + if (attr == hwmon_temp_label) { + *str = system76_name(data->ntmp, channel); + if (*str) + return 0; + } + break; + + default: + return -EOPNOTSUPP; + } + + return -EOPNOTSUPP; +} + +static const struct hwmon_ops thermal_ops = { + .is_visible = thermal_is_visible, + .read = thermal_read, + .read_string = thermal_read_string, +}; + +// Allocate up to 8 fans and temperatures +static const struct hwmon_channel_info *thermal_channel_info[] = { + HWMON_CHANNEL_INFO(fan, + HWMON_F_INPUT | HWMON_F_LABEL, + HWMON_F_INPUT | HWMON_F_LABEL, + HWMON_F_INPUT | HWMON_F_LABEL, + HWMON_F_INPUT | HWMON_F_LABEL, + HWMON_F_INPUT | HWMON_F_LABEL, + HWMON_F_INPUT | HWMON_F_LABEL, + HWMON_F_INPUT | HWMON_F_LABEL, + HWMON_F_INPUT | HWMON_F_LABEL), + HWMON_CHANNEL_INFO(pwm, + HWMON_PWM_INPUT, + HWMON_PWM_INPUT, + HWMON_PWM_INPUT, + HWMON_PWM_INPUT, + HWMON_PWM_INPUT, + HWMON_PWM_INPUT, + HWMON_PWM_INPUT, + HWMON_PWM_INPUT), + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL, + HWMON_T_INPUT | HWMON_T_LABEL), + NULL +}; + +static const struct hwmon_chip_info thermal_chip_info = { + .ops = &thermal_ops, + .info = thermal_channel_info, +}; + +static void input_key(struct system76_data *data, unsigned int code) +{ + input_report_key(data->input, code, 1); + input_sync(data->input); + + input_report_key(data->input, code, 0); + input_sync(data->input); +} + +// Handle ACPI notification +static void system76_notify(struct acpi_device *acpi_dev, u32 event) +{ + struct system76_data *data; + + data = acpi_driver_data(acpi_dev); + switch (event) { + case 0x80: + kb_led_hotkey_hardware(data); + break; + case 0x81: + kb_led_hotkey_toggle(data); + break; + case 0x82: + kb_led_hotkey_down(data); + break; + case 0x83: + kb_led_hotkey_up(data); + break; + case 0x84: + kb_led_hotkey_color(data); + break; + case 0x85: + input_key(data, KEY_SCREENLOCK); + break; + } +} + +// Add a System76 ACPI device +static int system76_add(struct acpi_device *acpi_dev) +{ + struct system76_data *data; + int err; + + data = devm_kzalloc(&acpi_dev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + acpi_dev->driver_data = data; + data->acpi_dev = acpi_dev; + + // Some models do not run open EC firmware. Check for an ACPI method + // that only exists on open EC to guard functionality specific to it. + data->has_open_ec = acpi_has_method(acpi_device_handle(data->acpi_dev), "NFAN"); + + err = system76_get(data, "INIT"); + if (err) + return err; + data->ap_led.name = "system76_acpi::airplane"; + data->ap_led.flags = LED_CORE_SUSPENDRESUME; + data->ap_led.brightness_get = ap_led_get; + data->ap_led.brightness_set_blocking = ap_led_set; + data->ap_led.max_brightness = 1; + data->ap_led.default_trigger = "rfkill-none"; + err = devm_led_classdev_register(&acpi_dev->dev, &data->ap_led); + if (err) + return err; + + data->kb_led.name = "system76_acpi::kbd_backlight"; + data->kb_led.flags = LED_BRIGHT_HW_CHANGED | LED_CORE_SUSPENDRESUME; + data->kb_led.brightness_get = kb_led_get; + data->kb_led.brightness_set_blocking = kb_led_set; + if (acpi_has_method(acpi_device_handle(data->acpi_dev), "SKBC")) { + data->kb_led.max_brightness = 255; + data->kb_led.groups = system76_kb_led_color_groups; + data->kb_toggle_brightness = 72; + data->kb_color = 0xffffff; + system76_set(data, "SKBC", data->kb_color); + } else { + data->kb_led.max_brightness = 5; + data->kb_color = -1; + } + err = devm_led_classdev_register(&acpi_dev->dev, &data->kb_led); + if (err) + return err; + + data->input = devm_input_allocate_device(&acpi_dev->dev); + if (!data->input) + return -ENOMEM; + + data->input->name = "System76 ACPI Hotkeys"; + data->input->phys = "system76_acpi/input0"; + data->input->id.bustype = BUS_HOST; + data->input->dev.parent = &acpi_dev->dev; + input_set_capability(data->input, EV_KEY, KEY_SCREENLOCK); + + err = input_register_device(data->input); + if (err) + goto error; + + if (data->has_open_ec) { + err = system76_get_object(data, "NFAN", &data->nfan); + if (err) + goto error; + + err = system76_get_object(data, "NTMP", &data->ntmp); + if (err) + goto error; + + data->therm = devm_hwmon_device_register_with_info(&acpi_dev->dev, + "system76_acpi", data, &thermal_chip_info, NULL); + err = PTR_ERR_OR_ZERO(data->therm); + if (err) + goto error; + + system76_battery_init(); + } + + return 0; + +error: + if (data->has_open_ec) { + kfree(data->ntmp); + kfree(data->nfan); + } + return err; +} + +// Remove a System76 ACPI device +static int system76_remove(struct acpi_device *acpi_dev) +{ + struct system76_data *data; + + data = acpi_driver_data(acpi_dev); + + if (data->has_open_ec) { + system76_battery_exit(); + kfree(data->nfan); + kfree(data->ntmp); + } + + devm_led_classdev_unregister(&acpi_dev->dev, &data->ap_led); + devm_led_classdev_unregister(&acpi_dev->dev, &data->kb_led); + + system76_get(data, "FINI"); + + return 0; +} + +static struct acpi_driver system76_driver = { + .name = "System76 ACPI Driver", + .class = "hotkey", + .ids = device_ids, + .ops = { + .add = system76_add, + .remove = system76_remove, + .notify = system76_notify, + }, +}; +module_acpi_driver(system76_driver); + +MODULE_DESCRIPTION("System76 ACPI Driver"); +MODULE_AUTHOR("Jeremy Soller <jeremy@system76.com>"); +MODULE_LICENSE("GPL"); |