linux/drivers/acpi/ac.c
Alexander Mezin 50a2bc5429 ACPI / AC: change notification handler type to ACPI_ALL_NOTIFY
With kernel 3.13rc5 there are no AC adapter notifications on my laptop.

Commit cc8ef52707 "ACPI / AC: convert ACPI ac driver to platform bus"
changed the driver to listen to device notifications only. However, AML
code on my laptop notifies the driver with zero event.

This patch changes the driver to listen to all events again.

Fixes: cc8ef52707 (ACPI / AC: convert ACPI ac driver to platform bus)
References: https://bugzilla.kernel.org/show_bug.cgi?id=67821
Signed-off-by: Alexander Mezin <mezin.alexander@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-01-05 15:42:42 +01:00

306 lines
7.5 KiB
C

/*
* 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>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#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 <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.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 ac_sleep_before_get_state_ms;
struct acpi_ac {
struct power_supply charger;
struct platform_device *pdev;
unsigned long long state;
};
#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
/* --------------------------------------------------------------------------
AC Adapter Management
-------------------------------------------------------------------------- */
static int acpi_ac_get_state(struct acpi_ac *ac)
{
acpi_status status;
acpi_handle handle = ACPI_HANDLE(&ac->pdev->dev);
status = acpi_evaluate_integer(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_handler(acpi_handle handle, u32 event, void *data)
{
struct acpi_ac *ac = data;
struct acpi_device *adev;
if (!ac)
return;
switch (event) {
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
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);
adev = ACPI_COMPANION(&ac->pdev->dev);
acpi_bus_generate_netlink_event(adev->pnp.device_class,
dev_name(&ac->pdev->dev),
event, (u32) ac->state);
acpi_notifier_call_chain(adev, event, (u32) ac->state);
kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
}
return;
}
static int thinkpad_e530_quirk(const struct dmi_system_id *d)
{
ac_sleep_before_get_state_ms = 1000;
return 0;
}
static struct dmi_system_id ac_dmi_table[] = {
{
.callback = thinkpad_e530_quirk,
.ident = "thinkpad e530",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
},
},
{},
};
static int acpi_ac_probe(struct platform_device *pdev)
{
int result = 0;
struct acpi_ac *ac = NULL;
struct acpi_device *adev;
if (!pdev)
return -EINVAL;
adev = ACPI_COMPANION(&pdev->dev);
if (!adev)
return -ENODEV;
ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
if (!ac)
return -ENOMEM;
strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
ac->pdev = pdev;
platform_set_drvdata(pdev, ac);
result = acpi_ac_get_state(ac);
if (result)
goto end;
ac->charger.name = acpi_device_bid(adev);
ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
ac->charger.properties = ac_props;
ac->charger.num_properties = ARRAY_SIZE(ac_props);
ac->charger.get_property = get_ac_property;
result = power_supply_register(&pdev->dev, &ac->charger);
if (result)
goto end;
result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
ACPI_ALL_NOTIFY, acpi_ac_notify_handler, ac);
if (result) {
power_supply_unregister(&ac->charger);
goto end;
}
printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
acpi_device_name(adev), acpi_device_bid(adev),
ac->state ? "on-line" : "off-line");
end:
if (result)
kfree(ac);
dmi_check_system(ac_dmi_table);
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 = platform_get_drvdata(to_platform_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;
}
#endif
static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
static int acpi_ac_remove(struct platform_device *pdev)
{
struct acpi_ac *ac;
if (!pdev)
return -EINVAL;
acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
ACPI_ALL_NOTIFY, acpi_ac_notify_handler);
ac = platform_get_drvdata(pdev);
if (ac->charger.dev)
power_supply_unregister(&ac->charger);
kfree(ac);
return 0;
}
static const struct acpi_device_id acpi_ac_match[] = {
{ "ACPI0003", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
static struct platform_driver acpi_ac_driver = {
.probe = acpi_ac_probe,
.remove = acpi_ac_remove,
.driver = {
.name = "acpi-ac",
.owner = THIS_MODULE,
.pm = &acpi_ac_pm_ops,
.acpi_match_table = ACPI_PTR(acpi_ac_match),
},
};
static int __init acpi_ac_init(void)
{
int result;
if (acpi_disabled)
return -ENODEV;
result = platform_driver_register(&acpi_ac_driver);
if (result < 0)
return -ENODEV;
return 0;
}
static void __exit acpi_ac_exit(void)
{
platform_driver_unregister(&acpi_ac_driver);
}
module_init(acpi_ac_init);
module_exit(acpi_ac_exit);