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![Dawei Li](/assets/img/avatar_default.png)
For bus-based driver, device removal is implemented as:
1 device_remove()->
2 bus->remove()->
3 driver->remove()
Driver core needs no inform from callee(bus driver) about the
result of remove callback. In that case, commit fc7a6209d5
("bus: Make remove callback return void") forces bus_type::remove
be void-returned.
Now we have the situation that both 1 & 2 of calling chain are
void-returned, so it does not make much sense for 3(driver->remove)
to return non-void to its caller.
So the basic idea behind this change is making remove() callback of
any bus-based driver to be void-returned.
This change, for itself, is for device drivers based on acpi-bus.
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Lee Jones <lee@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dawei Li <set_pte_at@outlook.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for drivers/platform/surface/*
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
330 lines
7.5 KiB
C
330 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#define pr_fmt(fmt) "ACPI: AC: " fmt
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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 <acpi/battery.h>
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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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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 acpi_ac_add(struct acpi_device *device);
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static void acpi_ac_remove(struct acpi_device *device);
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static void acpi_ac_notify(struct acpi_device *device, u32 event);
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static const struct acpi_device_id ac_device_ids[] = {
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{"ACPI0003", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, ac_device_ids);
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#ifdef CONFIG_PM_SLEEP
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static int acpi_ac_resume(struct device *dev);
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#endif
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static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
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static int ac_sleep_before_get_state_ms;
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static int ac_only;
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static struct acpi_driver acpi_ac_driver = {
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.name = "ac",
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.class = ACPI_AC_CLASS,
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.ids = ac_device_ids,
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.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
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.ops = {
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.add = acpi_ac_add,
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.remove = acpi_ac_remove,
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.notify = acpi_ac_notify,
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},
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.drv.pm = &acpi_ac_pm,
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};
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struct acpi_ac {
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struct power_supply *charger;
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struct power_supply_desc charger_desc;
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struct acpi_device *device;
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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) power_supply_get_drvdata(x)
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/* AC Adapter Management */
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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 = AE_OK;
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if (!ac)
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return -EINVAL;
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if (ac_only) {
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ac->state = 1;
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return 0;
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}
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status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL,
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&ac->state);
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if (ACPI_FAILURE(status)) {
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acpi_handle_info(ac->device->handle,
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"Error reading AC Adapter state: %s\n",
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acpi_format_exception(status));
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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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/* sysfs I/F */
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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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/* Driver Model */
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static void acpi_ac_notify(struct acpi_device *device, u32 event)
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{
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struct acpi_ac *ac = acpi_driver_data(device);
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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_handle_debug(device->handle, "Unsupported event [0x%x]\n",
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event);
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fallthrough;
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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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acpi_bus_generate_netlink_event(device->pnp.device_class,
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dev_name(&device->dev), event,
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(u32) ac->state);
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acpi_notifier_call_chain(device, event, (u32) ac->state);
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kobject_uevent(&ac->charger->dev.kobj, KOBJ_CHANGE);
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}
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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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* notifications 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 __init 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 int __init ac_only_quirk(const struct dmi_system_id *d)
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{
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ac_only = 1;
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return 0;
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}
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/* Please keep this list alphabetically sorted */
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static const struct dmi_system_id ac_dmi_table[] __initconst = {
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{
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/* Kodlix GK45 returning incorrect state */
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.callback = ac_only_quirk,
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.matches = {
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DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
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},
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},
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{
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/* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
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.callback = thinkpad_e530_quirk,
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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_add(struct acpi_device *device)
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{
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struct power_supply_config psy_cfg = {};
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int result = 0;
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struct acpi_ac *ac = NULL;
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if (!device)
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return -EINVAL;
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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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ac->device = device;
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strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_AC_CLASS);
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device->driver_data = 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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psy_cfg.drv_data = ac;
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ac->charger_desc.name = acpi_device_bid(device);
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ac->charger_desc.type = POWER_SUPPLY_TYPE_MAINS;
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ac->charger_desc.properties = ac_props;
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ac->charger_desc.num_properties = ARRAY_SIZE(ac_props);
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ac->charger_desc.get_property = get_ac_property;
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ac->charger = power_supply_register(&ac->device->dev,
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&ac->charger_desc, &psy_cfg);
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if (IS_ERR(ac->charger)) {
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result = PTR_ERR(ac->charger);
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goto end;
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}
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pr_info("%s [%s] (%s)\n", acpi_device_name(device),
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acpi_device_bid(device), 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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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 int old_state;
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if (!dev)
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return -EINVAL;
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ac = acpi_driver_data(to_acpi_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 void acpi_ac_remove(struct acpi_device *device)
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{
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struct acpi_ac *ac = NULL;
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if (!device || !acpi_driver_data(device))
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return;
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ac = acpi_driver_data(device);
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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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}
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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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if (acpi_quirk_skip_acpi_ac_and_battery())
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return -ENODEV;
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dmi_check_system(ac_dmi_table);
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result = acpi_bus_register_driver(&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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acpi_bus_unregister_driver(&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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