diff options
Diffstat (limited to 'drivers/acpi/ac.c')
| -rw-r--r-- | drivers/acpi/ac.c | 389 |
1 files changed, 389 insertions, 0 deletions
diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c new file mode 100644 index 000000000..23ca1a1c6 --- /dev/null +++ b/drivers/acpi/ac.c @@ -0,0 +1,389 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $) + * + * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> + * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/dmi.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/acpi.h> +#include <acpi/battery.h> + +#define PREFIX "ACPI: " + +#define ACPI_AC_CLASS "ac_adapter" +#define ACPI_AC_DEVICE_NAME "AC Adapter" +#define ACPI_AC_FILE_STATE "state" +#define ACPI_AC_NOTIFY_STATUS 0x80 +#define ACPI_AC_STATUS_OFFLINE 0x00 +#define ACPI_AC_STATUS_ONLINE 0x01 +#define ACPI_AC_STATUS_UNKNOWN 0xFF + +#define _COMPONENT ACPI_AC_COMPONENT +ACPI_MODULE_NAME("ac"); + +MODULE_AUTHOR("Paul Diefenbaugh"); +MODULE_DESCRIPTION("ACPI AC Adapter Driver"); +MODULE_LICENSE("GPL"); + + +static int acpi_ac_add(struct acpi_device *device); +static int acpi_ac_remove(struct acpi_device *device); +static void acpi_ac_notify(struct acpi_device *device, u32 event); + +struct acpi_ac_bl { + const char *hid; + int hrv; +}; + +static const struct acpi_device_id ac_device_ids[] = { + {"ACPI0003", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, ac_device_ids); + +/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */ +static const struct acpi_ac_bl acpi_ac_blacklist[] = { + { "INT33F4", -1 }, /* X-Powers AXP288 PMIC */ + { "INT34D3", 3 }, /* Intel Cherrytrail Whiskey Cove PMIC */ +}; + +#ifdef CONFIG_PM_SLEEP +static int acpi_ac_resume(struct device *dev); +#endif +static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume); + +static int ac_sleep_before_get_state_ms; +static int ac_check_pmic = 1; +static int ac_only; + +static struct acpi_driver acpi_ac_driver = { + .name = "ac", + .class = ACPI_AC_CLASS, + .ids = ac_device_ids, + .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, + .ops = { + .add = acpi_ac_add, + .remove = acpi_ac_remove, + .notify = acpi_ac_notify, + }, + .drv.pm = &acpi_ac_pm, +}; + +struct acpi_ac { + struct power_supply *charger; + struct power_supply_desc charger_desc; + struct acpi_device * device; + unsigned long long state; + struct notifier_block battery_nb; +}; + +#define to_acpi_ac(x) power_supply_get_drvdata(x) + +/* -------------------------------------------------------------------------- + AC Adapter Management + -------------------------------------------------------------------------- */ + +static int acpi_ac_get_state(struct acpi_ac *ac) +{ + acpi_status status = AE_OK; + + if (!ac) + return -EINVAL; + + if (ac_only) { + ac->state = 1; + return 0; + } + + status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, + &ac->state); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, + "Error reading AC Adapter state")); + ac->state = ACPI_AC_STATUS_UNKNOWN; + return -ENODEV; + } + + return 0; +} + +/* -------------------------------------------------------------------------- + sysfs I/F + -------------------------------------------------------------------------- */ +static int get_ac_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct acpi_ac *ac = to_acpi_ac(psy); + + if (!ac) + return -ENODEV; + + if (acpi_ac_get_state(ac)) + return -ENODEV; + + switch (psp) { + case POWER_SUPPLY_PROP_ONLINE: + val->intval = ac->state; + break; + default: + return -EINVAL; + } + return 0; +} + +static enum power_supply_property ac_props[] = { + POWER_SUPPLY_PROP_ONLINE, +}; + +/* -------------------------------------------------------------------------- + Driver Model + -------------------------------------------------------------------------- */ + +static void acpi_ac_notify(struct acpi_device *device, u32 event) +{ + struct acpi_ac *ac = acpi_driver_data(device); + + if (!ac) + return; + + switch (event) { + default: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Unsupported event [0x%x]\n", event)); + fallthrough; + case ACPI_AC_NOTIFY_STATUS: + case ACPI_NOTIFY_BUS_CHECK: + case ACPI_NOTIFY_DEVICE_CHECK: + /* + * A buggy BIOS may notify AC first and then sleep for + * a specific time before doing actual operations in the + * EC event handler (_Qxx). This will cause the AC state + * reported by the ACPI event to be incorrect, so wait for a + * specific time for the EC event handler to make progress. + */ + if (ac_sleep_before_get_state_ms > 0) + msleep(ac_sleep_before_get_state_ms); + + acpi_ac_get_state(ac); + acpi_bus_generate_netlink_event(device->pnp.device_class, + dev_name(&device->dev), event, + (u32) ac->state); + acpi_notifier_call_chain(device, event, (u32) ac->state); + kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); + } + + return; +} + +static int acpi_ac_battery_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb); + struct acpi_bus_event *event = (struct acpi_bus_event *)data; + + /* + * On HP Pavilion dv6-6179er AC status notifications aren't triggered + * when adapter is plugged/unplugged. However, battery status + * notifcations are triggered when battery starts charging or + * discharging. Re-reading AC status triggers lost AC notifications, + * if AC status has changed. + */ + if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 && + event->type == ACPI_BATTERY_NOTIFY_STATUS) + acpi_ac_get_state(ac); + + return NOTIFY_OK; +} + +static int __init thinkpad_e530_quirk(const struct dmi_system_id *d) +{ + ac_sleep_before_get_state_ms = 1000; + return 0; +} + +static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d) +{ + ac_check_pmic = 0; + return 0; +} + +static int __init ac_only_quirk(const struct dmi_system_id *d) +{ + ac_only = 1; + return 0; +} + +/* Please keep this list alphabetically sorted */ +static const struct dmi_system_id ac_dmi_table[] __initconst = { + { + /* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */ + .callback = ac_do_not_check_pmic_quirk, + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"), + }, + }, + { + /* Kodlix GK45 returning incorrect state */ + .callback = ac_only_quirk, + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "GK45"), + }, + }, + { + /* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */ + .callback = ac_do_not_check_pmic_quirk, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "80XF"), + DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"), + }, + }, + { + /* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */ + .callback = thinkpad_e530_quirk, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"), + }, + }, + {}, +}; + +static int acpi_ac_add(struct acpi_device *device) +{ + struct power_supply_config psy_cfg = {}; + int result = 0; + struct acpi_ac *ac = NULL; + + + if (!device) + return -EINVAL; + + ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); + if (!ac) + return -ENOMEM; + + ac->device = device; + strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_AC_CLASS); + device->driver_data = ac; + + result = acpi_ac_get_state(ac); + if (result) + goto end; + + psy_cfg.drv_data = ac; + + ac->charger_desc.name = acpi_device_bid(device); + ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS; + ac->charger_desc.properties = ac_props; + ac->charger_desc.num_properties = ARRAY_SIZE(ac_props); + ac->charger_desc.get_property = get_ac_property; + ac->charger = power_supply_register(&ac->device->dev, + &ac->charger_desc, &psy_cfg); + if (IS_ERR(ac->charger)) { + result = PTR_ERR(ac->charger); + goto end; + } + + printk(KERN_INFO PREFIX "%s [%s] (%s)\n", + acpi_device_name(device), acpi_device_bid(device), + ac->state ? "on-line" : "off-line"); + + ac->battery_nb.notifier_call = acpi_ac_battery_notify; + register_acpi_notifier(&ac->battery_nb); +end: + if (result) { + kfree(ac); + } + + return result; +} + +#ifdef CONFIG_PM_SLEEP +static int acpi_ac_resume(struct device *dev) +{ + struct acpi_ac *ac; + unsigned old_state; + + if (!dev) + return -EINVAL; + + ac = acpi_driver_data(to_acpi_device(dev)); + if (!ac) + return -EINVAL; + + old_state = ac->state; + if (acpi_ac_get_state(ac)) + return 0; + if (old_state != ac->state) + kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE); + return 0; +} +#else +#define acpi_ac_resume NULL +#endif + +static int acpi_ac_remove(struct acpi_device *device) +{ + struct acpi_ac *ac = NULL; + + + if (!device || !acpi_driver_data(device)) + return -EINVAL; + + ac = acpi_driver_data(device); + + power_supply_unregister(ac->charger); + unregister_acpi_notifier(&ac->battery_nb); + + kfree(ac); + + return 0; +} + +static int __init acpi_ac_init(void) +{ + unsigned int i; + int result; + + if (acpi_disabled) + return -ENODEV; + + dmi_check_system(ac_dmi_table); + + if (ac_check_pmic) { + for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++) + if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1", + acpi_ac_blacklist[i].hrv)) { + pr_info(PREFIX "AC: found native %s PMIC, not loading\n", + acpi_ac_blacklist[i].hid); + return -ENODEV; + } + } + + result = acpi_bus_register_driver(&acpi_ac_driver); + if (result < 0) { + return -ENODEV; + } + + return 0; +} + +static void __exit acpi_ac_exit(void) +{ + acpi_bus_unregister_driver(&acpi_ac_driver); +} +module_init(acpi_ac_init); +module_exit(acpi_ac_exit); |