1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Asus Wireless Radio Control Driver
4 *
5 * Copyright (C) 2015-2016 Endless Mobile, Inc.
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/acpi.h>
13 #include <linux/input.h>
14 #include <linux/pci_ids.h>
15 #include <linux/leds.h>
16
17 struct hswc_params {
18 u8 on;
19 u8 off;
20 u8 status;
21 };
22
23 struct asus_wireless_data {
24 struct input_dev *idev;
25 struct acpi_device *adev;
26 const struct hswc_params *hswc_params;
27 struct workqueue_struct *wq;
28 struct work_struct led_work;
29 struct led_classdev led;
30 int led_state;
31 };
32
33 static const struct hswc_params atk4001_id_params = {
34 .on = 0x0,
35 .off = 0x1,
36 .status = 0x2,
37 };
38
39 static const struct hswc_params atk4002_id_params = {
40 .on = 0x5,
41 .off = 0x4,
42 .status = 0x2,
43 };
44
45 static const struct acpi_device_id device_ids[] = {
46 {"ATK4001", (kernel_ulong_t)&atk4001_id_params},
47 {"ATK4002", (kernel_ulong_t)&atk4002_id_params},
48 {"", 0},
49 };
50 MODULE_DEVICE_TABLE(acpi, device_ids);
51
asus_wireless_method(acpi_handle handle,const char * method,int param,u64 * ret)52 static acpi_status asus_wireless_method(acpi_handle handle, const char *method,
53 int param, u64 *ret)
54 {
55 struct acpi_object_list p;
56 union acpi_object obj;
57 acpi_status s;
58
59 acpi_handle_debug(handle, "Evaluating method %s, parameter %#x\n",
60 method, param);
61 obj.type = ACPI_TYPE_INTEGER;
62 obj.integer.value = param;
63 p.count = 1;
64 p.pointer = &obj;
65
66 s = acpi_evaluate_integer(handle, (acpi_string) method, &p, ret);
67 if (ACPI_FAILURE(s))
68 acpi_handle_err(handle,
69 "Failed to eval method %s, param %#x (%d)\n",
70 method, param, s);
71 else
72 acpi_handle_debug(handle, "%s returned %#llx\n", method, *ret);
73
74 return s;
75 }
76
led_state_get(struct led_classdev * led)77 static enum led_brightness led_state_get(struct led_classdev *led)
78 {
79 struct asus_wireless_data *data;
80 acpi_status s;
81 u64 ret;
82
83 data = container_of(led, struct asus_wireless_data, led);
84 s = asus_wireless_method(acpi_device_handle(data->adev), "HSWC",
85 data->hswc_params->status, &ret);
86 if (ACPI_SUCCESS(s) && ret == data->hswc_params->on)
87 return LED_FULL;
88 return LED_OFF;
89 }
90
led_state_update(struct work_struct * work)91 static void led_state_update(struct work_struct *work)
92 {
93 struct asus_wireless_data *data;
94 u64 ret;
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, &ret);
99 }
100
led_state_set(struct led_classdev * led,enum led_brightness value)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
asus_wireless_notify(struct acpi_device * adev,u32 event)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
asus_wireless_add(struct acpi_device * adev)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 data->led.default_trigger = "rfkill-none";
171 err = devm_led_classdev_register(&adev->dev, &data->led);
172 if (err)
173 destroy_workqueue(data->wq);
174
175 return err;
176 }
177
asus_wireless_remove(struct acpi_device * adev)178 static void asus_wireless_remove(struct acpi_device *adev)
179 {
180 struct asus_wireless_data *data = acpi_driver_data(adev);
181
182 if (data->wq) {
183 devm_led_classdev_unregister(&adev->dev, &data->led);
184 destroy_workqueue(data->wq);
185 }
186 }
187
188 static struct acpi_driver asus_wireless_driver = {
189 .name = "Asus Wireless Radio Control Driver",
190 .class = "hotkey",
191 .ids = device_ids,
192 .ops = {
193 .add = asus_wireless_add,
194 .remove = asus_wireless_remove,
195 .notify = asus_wireless_notify,
196 },
197 };
198 module_acpi_driver(asus_wireless_driver);
199
200 MODULE_DESCRIPTION("Asus Wireless Radio Control Driver");
201 MODULE_AUTHOR("João Paulo Rechi Vita <jprvita@gmail.com>");
202 MODULE_LICENSE("GPL");
203
