| 1 | |
| 2 | #include <linux/acpi.h>
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| 3 | #include <linux/module.h>
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| 4 | #include <linux/platform_device.h>
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| 5 | #include <linux/sched/signal.h>
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| 6 | #include <acpi/button.h>
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| 7 |
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| 8 | MODULE_AUTHOR("Josh Triplett");
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| 9 | MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
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| 10 | MODULE_LICENSE("GPL");
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| 11 |
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| 12 | static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
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| 13 | module_param(power_signal, int, 0644);
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| 14 | MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
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| 15 |
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| 16 | static const struct acpi_device_id tiny_power_button_device_ids[] = {
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| 17 | { ACPI_BUTTON_HID_POWER, 0 },
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| 18 | { ACPI_BUTTON_HID_POWERF, 0 },
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| 19 | { "", 0 },
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| 20 | };
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| 21 | MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
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| 22 |
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| 23 | static void acpi_tiny_power_button_notify(acpi_handle handle, u32 event, void *data)
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| 24 | {
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| 25 | kill_cad_pid(power_signal, 1);
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| 26 | }
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| 27 |
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| 28 | static void acpi_tiny_power_button_notify_run(void *not_used)
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| 29 | {
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| 30 | acpi_tiny_power_button_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, NULL);
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| 31 | }
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| 32 |
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| 33 | static u32 acpi_tiny_power_button_event(void *not_used)
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| 34 | {
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| 35 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_tiny_power_button_notify_run, NULL);
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| 36 | return ACPI_INTERRUPT_HANDLED;
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| 37 | }
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| 38 |
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| 39 | static int acpi_tiny_power_button_probe(struct platform_device *pdev)
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| 40 | {
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| 41 | struct acpi_device *device;
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| 42 | acpi_status status;
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| 43 |
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| 44 | device = ACPI_COMPANION(&pdev->dev);
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| 45 | if (!device)
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| 46 | return -ENODEV;
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| 47 |
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| 48 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
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| 49 | status = acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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| 50 | acpi_tiny_power_button_event,
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| 51 | NULL);
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| 52 | } else {
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| 53 | status = acpi_install_notify_handler(device->handle,
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| 54 | ACPI_DEVICE_NOTIFY,
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| 55 | acpi_tiny_power_button_notify,
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| 56 | NULL);
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| 57 | }
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| 58 | if (ACPI_FAILURE(status))
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| 59 | return -ENODEV;
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| 60 |
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| 61 | return 0;
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| 62 | }
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| 63 |
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| 64 | static void acpi_tiny_power_button_remove(struct platform_device *pdev)
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| 65 | {
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| 66 | struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
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| 67 |
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| 68 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) {
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| 69 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
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| 70 | acpi_tiny_power_button_event);
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| 71 | } else {
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| 72 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
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| 73 | acpi_tiny_power_button_notify);
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| 74 | }
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| 75 | acpi_os_wait_events_complete();
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| 76 | }
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| 77 |
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| 78 | static struct platform_driver acpi_tiny_power_button_driver = {
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| 79 | .probe = acpi_tiny_power_button_probe,
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| 80 | .remove = acpi_tiny_power_button_remove,
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| 81 | .driver = {
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| 82 | .name = "acpi-tiny-power-button",
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| 83 | .acpi_match_table = tiny_power_button_device_ids,
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| 84 | },
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| 85 | };
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| 86 |
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| 87 | module_platform_driver(acpi_tiny_power_button_driver);
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