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0008 #include <linux/kernel.h>
0009 #include <linux/module.h>
0010 #include <linux/input.h>
0011 #include <linux/acpi.h>
0012 #include <linux/platform_device.h>
0013
0014 #define ACPI_BUTTON_HID_SWBTN "AHC0310"
0015
0016 #define ACPI_BUTTON_NOTIFY_SWBTN_RELEASE 0x86
0017 #define ACPI_BUTTON_NOTIFY_SWBTN_PRESSED 0x85
0018
0019 struct adv_swbutton {
0020 struct input_dev *input;
0021 char phys[32];
0022 };
0023
0024
0025
0026
0027
0028 static void adv_swbutton_notify(acpi_handle handle, u32 event, void *context)
0029 {
0030 struct platform_device *device = context;
0031 struct adv_swbutton *button = dev_get_drvdata(&device->dev);
0032
0033 switch (event) {
0034 case ACPI_BUTTON_NOTIFY_SWBTN_RELEASE:
0035 input_report_key(button->input, KEY_PROG1, 0);
0036 input_sync(button->input);
0037 break;
0038 case ACPI_BUTTON_NOTIFY_SWBTN_PRESSED:
0039 input_report_key(button->input, KEY_PROG1, 1);
0040 input_sync(button->input);
0041 break;
0042 default:
0043 dev_dbg(&device->dev, "Unsupported event [0x%x]\n", event);
0044 }
0045 }
0046
0047 static int adv_swbutton_probe(struct platform_device *device)
0048 {
0049 struct adv_swbutton *button;
0050 struct input_dev *input;
0051 acpi_handle handle = ACPI_HANDLE(&device->dev);
0052 acpi_status status;
0053 int error;
0054
0055 button = devm_kzalloc(&device->dev, sizeof(*button), GFP_KERNEL);
0056 if (!button)
0057 return -ENOMEM;
0058
0059 dev_set_drvdata(&device->dev, button);
0060
0061 input = devm_input_allocate_device(&device->dev);
0062 if (!input)
0063 return -ENOMEM;
0064
0065 button->input = input;
0066 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", ACPI_BUTTON_HID_SWBTN);
0067
0068 input->name = "Advantech Software Button";
0069 input->phys = button->phys;
0070 input->id.bustype = BUS_HOST;
0071 input->dev.parent = &device->dev;
0072 set_bit(EV_REP, input->evbit);
0073 input_set_capability(input, EV_KEY, KEY_PROG1);
0074
0075 error = input_register_device(input);
0076 if (error)
0077 return error;
0078
0079 device_init_wakeup(&device->dev, true);
0080
0081 status = acpi_install_notify_handler(handle,
0082 ACPI_DEVICE_NOTIFY,
0083 adv_swbutton_notify,
0084 device);
0085 if (ACPI_FAILURE(status)) {
0086 dev_err(&device->dev, "Error installing notify handler\n");
0087 return -EIO;
0088 }
0089
0090 return 0;
0091 }
0092
0093 static int adv_swbutton_remove(struct platform_device *device)
0094 {
0095 acpi_handle handle = ACPI_HANDLE(&device->dev);
0096
0097 acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY,
0098 adv_swbutton_notify);
0099
0100 return 0;
0101 }
0102
0103 static const struct acpi_device_id button_device_ids[] = {
0104 {ACPI_BUTTON_HID_SWBTN, 0},
0105 {"", 0},
0106 };
0107 MODULE_DEVICE_TABLE(acpi, button_device_ids);
0108
0109 static struct platform_driver adv_swbutton_driver = {
0110 .driver = {
0111 .name = "adv_swbutton",
0112 .acpi_match_table = button_device_ids,
0113 },
0114 .probe = adv_swbutton_probe,
0115 .remove = adv_swbutton_remove,
0116 };
0117 module_platform_driver(adv_swbutton_driver);
0118
0119 MODULE_AUTHOR("Andrea Ho");
0120 MODULE_DESCRIPTION("Advantech ACPI SW Button Driver");
0121 MODULE_LICENSE("GPL v2");