drivers/platform/x86/asus-wireless.c

   1 /*
   2  * Asus Wireless Radio Control Driver
   3  *
   4  * Copyright (C) 2015-2016 Endless Mobile, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/types.h>
  15 #include <linux/acpi.h>
  16 #include <linux/input.h>
  17 #include <linux/pci_ids.h>
  18 #include <linux/leds.h>
  19
  20 struct hswc_params {
  21         u8 on;
  22         u8 off;
  23         u8 status;
  24 };
  25
  26 struct asus_wireless_data {
  27         struct input_dev *idev;
  28         struct acpi_device *adev;
  29         const struct hswc_params *hswc_params;
  30         struct workqueue_struct *wq;
  31         struct work_struct led_work;
  32         struct led_classdev led;
  33         int led_state;
  34 };
  35
  36 static const struct hswc_params atk4001_id_params = {
  37         .on = 0x0,
  38         .off = 0x1,
  39         .status = 0x2,
  40 };
  41
  42 static const struct hswc_params atk4002_id_params = {
  43         .on = 0x5,
  44         .off = 0x4,
  45         .status = 0x2,
  46 };
  47
  48 static const struct acpi_device_id device_ids[] = {
  49         {"ATK4001", (kernel_ulong_t)&atk4001_id_params},
  50         {"ATK4002", (kernel_ulong_t)&atk4002_id_params},
  51         {"", 0},
  52 };
  53 MODULE_DEVICE_TABLE(acpi, device_ids);
  54
  55 static u64 asus_wireless_method(acpi_handle handle, const char *method,
  56                                 int param)
  57 {
  58         struct acpi_object_list p;
  59         union acpi_object obj;
  60         acpi_status s;
  61         u64 ret;
  62
  63         acpi_handle_debug(handle, "Evaluating method %s, parameter %#x\n",
  64                           method, param);
  65         obj.type = ACPI_TYPE_INTEGER;
  66         obj.integer.value = param;
  67         p.count = 1;
  68         p.pointer = &obj;
  69
  70         s = acpi_evaluate_integer(handle, (acpi_string) method, &p, &ret);
  71         if (ACPI_FAILURE(s))
  72                 acpi_handle_err(handle,
  73                                 "Failed to eval method %s, param %#x (%d)\n",
  74                                 method, param, s);
  75         acpi_handle_debug(handle, "%s returned %#x\n", method, (uint) ret);
  76         return ret;
  77 }
  78
  79 static enum led_brightness led_state_get(struct led_classdev *led)
  80 {
  81         struct asus_wireless_data *data;
  82         int s;
  83
  84         data = container_of(led, struct asus_wireless_data, led);
  85         s = asus_wireless_method(acpi_device_handle(data->adev), "HSWC",
  86                                  data->hswc_params->status);
  87         if (s == data->hswc_params->on)
  88                 return LED_FULL;
  89         return LED_OFF;
  90 }
  91
  92 static void led_state_update(struct work_struct *work)
  93 {
  94         struct asus_wireless_data *data;
  95
  96         data = container_of(work, struct asus_wireless_data, led_work);
  97         asus_wireless_method(acpi_device_handle(data->adev), "HSWC",
  98                              data->led_state);
  99 }
 100
 101 static void led_state_set(struct led_classdev *led, enum led_brightness value)
 102 {
 103         struct asus_wireless_data *data;
 104
 105         data = container_of(led, struct asus_wireless_data, led);
 106         data->led_state = value == LED_OFF ? data->hswc_params->off :
 107                                              data->hswc_params->on;
 108         queue_work(data->wq, &data->led_work);
 109 }
 110
 111 static void asus_wireless_notify(struct acpi_device *adev, u32 event)
 112 {
 113         struct asus_wireless_data *data = acpi_driver_data(adev);
 114
 115         dev_dbg(&adev->dev, "event=%#x\n", event);
 116         if (event != 0x88) {
 117                 dev_notice(&adev->dev, "Unknown ASHS event: %#x\n", event);
 118                 return;
 119         }
 120         input_report_key(data->idev, KEY_RFKILL, 1);
 121         input_sync(data->idev);
 122         input_report_key(data->idev, KEY_RFKILL, 0);
 123         input_sync(data->idev);
 124 }
 125
 126 static int asus_wireless_add(struct acpi_device *adev)
 127 {
 128         struct asus_wireless_data *data;
 129         const struct acpi_device_id *id;
 130         int err;
 131
 132         data = devm_kzalloc(&adev->dev, sizeof(*data), GFP_KERNEL);
 133         if (!data)
 134                 return -ENOMEM;
 135         adev->driver_data = data;
 136         data->adev = adev;
 137
 138         data->idev = devm_input_allocate_device(&adev->dev);
 139         if (!data->idev)
 140                 return -ENOMEM;
 141         data->idev->name = "Asus Wireless Radio Control";
 142         data->idev->phys = "asus-wireless/input0";
 143         data->idev->id.bustype = BUS_HOST;
 144         data->idev->id.vendor = PCI_VENDOR_ID_ASUSTEK;
 145         set_bit(EV_KEY, data->idev->evbit);
 146         set_bit(KEY_RFKILL, data->idev->keybit);
 147         err = input_register_device(data->idev);
 148         if (err)
 149                 return err;
 150
 151         for (id = device_ids; id->id[0]; id++) {
 152                 if (!strcmp((char *) id->id, acpi_device_hid(adev))) {
 153                         data->hswc_params =
 154                                 (const struct hswc_params *)id->driver_data;
 155                         break;
 156                 }
 157         }
 158         if (!data->hswc_params)
 159                 return 0;
 160
 161         data->wq = create_singlethread_workqueue("asus_wireless_workqueue");
 162         if (!data->wq)
 163                 return -ENOMEM;
 164         INIT_WORK(&data->led_work, led_state_update);
 165         data->led.name = "asus-wireless::airplane";
 166         data->led.brightness_set = led_state_set;
 167         data->led.brightness_get = led_state_get;
 168         data->led.flags = LED_CORE_SUSPENDRESUME;
 169         data->led.max_brightness = 1;
 170         err = devm_led_classdev_register(&adev->dev, &data->led);
 171         if (err)
 172                 destroy_workqueue(data->wq);
 173
 174         return err;
 175 }
 176
 177 static int asus_wireless_remove(struct acpi_device *adev)
 178 {
 179         struct asus_wireless_data *data = acpi_driver_data(adev);
 180
 181         if (data->wq)
 182                 destroy_workqueue(data->wq);
 183         return 0;
 184 }
 185
 186 static struct acpi_driver asus_wireless_driver = {
 187         .name = "Asus Wireless Radio Control Driver",
 188         .class = "hotkey",
 189         .ids = device_ids,
 190         .ops = {
 191                 .add = asus_wireless_add,
 192                 .remove = asus_wireless_remove,
 193                 .notify = asus_wireless_notify,
 194         },
 195 };
 196 module_acpi_driver(asus_wireless_driver);
 197
 198 MODULE_DESCRIPTION("Asus Wireless Radio Control Driver");
 199 MODULE_AUTHOR("João Paulo Rechi Vita <jprvita@gmail.com>");
 200 MODULE_LICENSE("GPL");