332 lines
8.4 KiB
C
332 lines
8.4 KiB
C
/*
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* acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/dmi.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/acpi.h>
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#include "battery.h"
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#define PREFIX "ACPI: "
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#define ACPI_AC_CLASS "ac_adapter"
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#define ACPI_AC_DEVICE_NAME "AC Adapter"
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#define ACPI_AC_FILE_STATE "state"
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#define ACPI_AC_NOTIFY_STATUS 0x80
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#define ACPI_AC_STATUS_OFFLINE 0x00
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#define ACPI_AC_STATUS_ONLINE 0x01
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#define ACPI_AC_STATUS_UNKNOWN 0xFF
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#define _COMPONENT ACPI_AC_COMPONENT
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ACPI_MODULE_NAME("ac");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI AC Adapter Driver");
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MODULE_LICENSE("GPL");
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static int ac_sleep_before_get_state_ms;
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struct acpi_ac {
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struct power_supply charger;
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struct platform_device *pdev;
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unsigned long long state;
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struct notifier_block battery_nb;
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};
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#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
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/* --------------------------------------------------------------------------
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AC Adapter Management
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-------------------------------------------------------------------------- */
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static int acpi_ac_get_state(struct acpi_ac *ac)
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{
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acpi_status status;
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acpi_handle handle = ACPI_HANDLE(&ac->pdev->dev);
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status = acpi_evaluate_integer(handle, "_PSR", NULL,
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&ac->state);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Error reading AC Adapter state"));
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ac->state = ACPI_AC_STATUS_UNKNOWN;
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return -ENODEV;
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}
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return 0;
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}
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/* --------------------------------------------------------------------------
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sysfs I/F
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-------------------------------------------------------------------------- */
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static int get_ac_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct acpi_ac *ac = to_acpi_ac(psy);
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if (!ac)
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return -ENODEV;
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if (acpi_ac_get_state(ac))
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return -ENODEV;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = ac->state;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static enum power_supply_property ac_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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/* --------------------------------------------------------------------------
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Driver Model
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-------------------------------------------------------------------------- */
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static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
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{
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struct acpi_ac *ac = data;
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struct acpi_device *adev;
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if (!ac)
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return;
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switch (event) {
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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case ACPI_AC_NOTIFY_STATUS:
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case ACPI_NOTIFY_BUS_CHECK:
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case ACPI_NOTIFY_DEVICE_CHECK:
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/*
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* A buggy BIOS may notify AC first and then sleep for
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* a specific time before doing actual operations in the
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* EC event handler (_Qxx). This will cause the AC state
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* reported by the ACPI event to be incorrect, so wait for a
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* specific time for the EC event handler to make progress.
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*/
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if (ac_sleep_before_get_state_ms > 0)
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msleep(ac_sleep_before_get_state_ms);
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acpi_ac_get_state(ac);
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adev = ACPI_COMPANION(&ac->pdev->dev);
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acpi_bus_generate_netlink_event(adev->pnp.device_class,
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dev_name(&ac->pdev->dev),
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event, (u32) ac->state);
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acpi_notifier_call_chain(adev, event, (u32) ac->state);
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kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
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}
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return;
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}
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static int acpi_ac_battery_notify(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
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struct acpi_bus_event *event = (struct acpi_bus_event *)data;
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/*
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* On HP Pavilion dv6-6179er AC status notifications aren't triggered
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* when adapter is plugged/unplugged. However, battery status
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* notifcations are triggered when battery starts charging or
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* discharging. Re-reading AC status triggers lost AC notifications,
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* if AC status has changed.
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*/
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if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
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event->type == ACPI_BATTERY_NOTIFY_STATUS)
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acpi_ac_get_state(ac);
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return NOTIFY_OK;
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}
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static int thinkpad_e530_quirk(const struct dmi_system_id *d)
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{
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ac_sleep_before_get_state_ms = 1000;
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return 0;
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}
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static struct dmi_system_id ac_dmi_table[] = {
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{
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.callback = thinkpad_e530_quirk,
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.ident = "thinkpad e530",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
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},
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},
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{},
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};
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static int acpi_ac_probe(struct platform_device *pdev)
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{
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int result = 0;
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struct acpi_ac *ac = NULL;
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struct acpi_device *adev;
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if (!pdev)
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return -EINVAL;
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adev = ACPI_COMPANION(&pdev->dev);
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if (!adev)
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return -ENODEV;
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ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
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if (!ac)
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return -ENOMEM;
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strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
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strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
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ac->pdev = pdev;
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platform_set_drvdata(pdev, ac);
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result = acpi_ac_get_state(ac);
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if (result)
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goto end;
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ac->charger.name = acpi_device_bid(adev);
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ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
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ac->charger.properties = ac_props;
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ac->charger.num_properties = ARRAY_SIZE(ac_props);
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ac->charger.get_property = get_ac_property;
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result = power_supply_register(&pdev->dev, &ac->charger);
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if (result)
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goto end;
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result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
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ACPI_ALL_NOTIFY, acpi_ac_notify_handler, ac);
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if (result) {
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power_supply_unregister(&ac->charger);
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goto end;
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}
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printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
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acpi_device_name(adev), acpi_device_bid(adev),
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ac->state ? "on-line" : "off-line");
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ac->battery_nb.notifier_call = acpi_ac_battery_notify;
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register_acpi_notifier(&ac->battery_nb);
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end:
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if (result)
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kfree(ac);
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dmi_check_system(ac_dmi_table);
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return result;
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}
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#ifdef CONFIG_PM_SLEEP
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static int acpi_ac_resume(struct device *dev)
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{
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struct acpi_ac *ac;
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unsigned old_state;
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if (!dev)
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return -EINVAL;
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ac = platform_get_drvdata(to_platform_device(dev));
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if (!ac)
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return -EINVAL;
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old_state = ac->state;
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if (acpi_ac_get_state(ac))
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return 0;
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if (old_state != ac->state)
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kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
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return 0;
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}
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#else
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#define acpi_ac_resume NULL
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#endif
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static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
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static int acpi_ac_remove(struct platform_device *pdev)
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{
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struct acpi_ac *ac;
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if (!pdev)
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return -EINVAL;
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acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
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ACPI_ALL_NOTIFY, acpi_ac_notify_handler);
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ac = platform_get_drvdata(pdev);
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if (ac->charger.dev)
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power_supply_unregister(&ac->charger);
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unregister_acpi_notifier(&ac->battery_nb);
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kfree(ac);
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return 0;
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}
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static const struct acpi_device_id acpi_ac_match[] = {
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{ "ACPI0003", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
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static struct platform_driver acpi_ac_driver = {
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.probe = acpi_ac_probe,
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.remove = acpi_ac_remove,
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.driver = {
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.name = "acpi-ac",
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.owner = THIS_MODULE,
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.pm = &acpi_ac_pm_ops,
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.acpi_match_table = ACPI_PTR(acpi_ac_match),
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},
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};
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static int __init acpi_ac_init(void)
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{
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int result;
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if (acpi_disabled)
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return -ENODEV;
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result = platform_driver_register(&acpi_ac_driver);
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if (result < 0)
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return -ENODEV;
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return 0;
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}
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static void __exit acpi_ac_exit(void)
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{
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platform_driver_unregister(&acpi_ac_driver);
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}
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module_init(acpi_ac_init);
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module_exit(acpi_ac_exit);
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