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 
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 
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 
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 
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 	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 
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