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_report_key(data->idev, KEY_RFKILL, 0);
122 	input_sync(data->idev);
123 }
124 
125 static int asus_wireless_add(struct acpi_device *adev)
126 {
127 	struct asus_wireless_data *data;
128 	const struct acpi_device_id *id;
129 	int err;
130 
131 	data = devm_kzalloc(&adev->dev, sizeof(*data), GFP_KERNEL);
132 	if (!data)
133 		return -ENOMEM;
134 	adev->driver_data = data;
135 	data->adev = adev;
136 
137 	data->idev = devm_input_allocate_device(&adev->dev);
138 	if (!data->idev)
139 		return -ENOMEM;
140 	data->idev->name = "Asus Wireless Radio Control";
141 	data->idev->phys = "asus-wireless/input0";
142 	data->idev->id.bustype = BUS_HOST;
143 	data->idev->id.vendor = PCI_VENDOR_ID_ASUSTEK;
144 	set_bit(EV_KEY, data->idev->evbit);
145 	set_bit(KEY_RFKILL, data->idev->keybit);
146 	err = input_register_device(data->idev);
147 	if (err)
148 		return err;
149 
150 	for (id = device_ids; id->id[0]; id++) {
151 		if (!strcmp((char *) id->id, acpi_device_hid(adev))) {
152 			data->hswc_params =
153 				(const struct hswc_params *)id->driver_data;
154 			break;
155 		}
156 	}
157 	if (!data->hswc_params)
158 		return 0;
159 
160 	data->wq = create_singlethread_workqueue("asus_wireless_workqueue");
161 	if (!data->wq)
162 		return -ENOMEM;
163 	INIT_WORK(&data->led_work, led_state_update);
164 	data->led.name = "asus-wireless::airplane";
165 	data->led.brightness_set = led_state_set;
166 	data->led.brightness_get = led_state_get;
167 	data->led.flags = LED_CORE_SUSPENDRESUME;
168 	data->led.max_brightness = 1;
169 	err = devm_led_classdev_register(&adev->dev, &data->led);
170 	if (err)
171 		destroy_workqueue(data->wq);
172 
173 	return err;
174 }
175 
176 static int asus_wireless_remove(struct acpi_device *adev)
177 {
178 	struct asus_wireless_data *data = acpi_driver_data(adev);
179 
180 	if (data->wq)
181 		destroy_workqueue(data->wq);
182 	return 0;
183 }
184 
185 static struct acpi_driver asus_wireless_driver = {
186 	.name = "Asus Wireless Radio Control Driver",
187 	.class = "hotkey",
188 	.ids = device_ids,
189 	.ops = {
190 		.add = asus_wireless_add,
191 		.remove = asus_wireless_remove,
192 		.notify = asus_wireless_notify,
193 	},
194 };
195 module_acpi_driver(asus_wireless_driver);
196 
197 MODULE_DESCRIPTION("Asus Wireless Radio Control Driver");
198 MODULE_AUTHOR("João Paulo Rechi Vita <jprvita@gmail.com>");
199 MODULE_LICENSE("GPL");
200