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e4865a56d0
Since every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence. Accordingly, add requisite ACPI_COMPANION() or ACPI_HANDLE() checks against NULL to 13 platform drivers handling core ACPI devices. Also change the value returned by the ACPI thermal zone driver when the device's ACPI companion is not present to -ENODEV for consistency with the other drivers. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/4516068.ejJDZkT8p0@rafael.j.wysocki Cc: 7.0+ <stable@vger.kernel.org> # 7.0+
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/sched/signal.h>
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#include <acpi/button.h>
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MODULE_AUTHOR("Josh Triplett");
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MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
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MODULE_LICENSE("GPL");
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static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
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module_param(power_signal, int, 0644);
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MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
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static const struct acpi_device_id tiny_power_button_device_ids[] = {
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{ ACPI_BUTTON_HID_POWER, 0 },
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{ ACPI_BUTTON_HID_POWERF, 0 },
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{ "", 0 },
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};
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MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
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static void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data)
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{
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kill_cad_pid(power_signal, 1);
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}
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static void acpi_tiny_power_button_notify_run(void *not_used)
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{
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acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL);
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}
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static u32 acpi_tiny_power_button_event(void *not_used)
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{
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acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_tiny_power_button_notify_run, NULL);
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return ACPI_INTERRUPT_HANDLED;
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}
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static int acpi_tiny_power_button_probe(struct platform_device *pdev)
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{
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struct acpi_device *device;
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acpi_status status;
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device = ACPI_COMPANION(&pdev->dev);
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if (!device)
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return -ENODEV;
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if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
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status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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acpi_tiny_power_button_event,
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NULL);
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} else {
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status = acpi_install_notify_handler(device->handle,
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ACPI_DEVICE_NOTIFY,
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acpi_tiny_power_button_notify,
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NULL);
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}
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return 0;
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}
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static void acpi_tiny_power_button_remove(struct platform_device *pdev)
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{
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struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
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acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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acpi_tiny_power_button_event);
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} else {
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acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
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acpi_tiny_power_button_notify);
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}
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acpi_os_wait_events_complete();
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}
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static struct platform_driver acpi_tiny_power_button_driver = {
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.probe = acpi_tiny_power_button_probe,
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.remove = acpi_tiny_power_button_remove,
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.driver = {
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.name = "acpi-tiny-power-button",
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.acpi_match_table = tiny_power_button_device_ids,
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},
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};
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module_platform_driver(acpi_tiny_power_button_driver);
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