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OpenCloudOS-Kernel/drivers/acpi/ac.c

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// 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>
*/
#define pr_fmt(fmt) "ACPI: AC: " fmt
#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 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
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 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;
status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
&ac->state);
if (ACPI_FAILURE(status)) {
acpi_handle_info(ac->device->handle,
"Error reading AC Adapter state: %s\n",
acpi_format_exception(status));
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_handle_debug(device->handle, "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;
}
/* 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"),
},
},
{
/* 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;
}
pr_info("%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("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);
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