Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 0d6f135e266c2f81e1f4e88f32e57379de0ac3e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/*
 * MSI GT683R led driver
 *
 * Copyright (c) 2014 Janne Kanniainen <janne.kanniainen@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>

#include "hid-ids.h"

#define GT683R_BUFFER_SIZE			8

/*
 * GT683R_LED_OFF: all LEDs are off
 * GT683R_LED_AUDIO: LEDs brightness depends on sound level
 * GT683R_LED_BREATHING: LEDs brightness varies at human breathing rate
 * GT683R_LED_NORMAL: LEDs are fully on when enabled
 */
enum gt683r_led_mode {
	GT683R_LED_OFF = 0,
	GT683R_LED_AUDIO = 2,
	GT683R_LED_BREATHING = 3,
	GT683R_LED_NORMAL = 5
};

enum gt683r_panels {
	GT683R_LED_BACK = 0,
	GT683R_LED_SIDE = 1,
	GT683R_LED_FRONT = 2,
	GT683R_LED_COUNT,
};

static const char * const gt683r_panel_names[] = {
	"back",
	"side",
	"front",
};

struct gt683r_led {
	struct hid_device *hdev;
	struct led_classdev led_devs[GT683R_LED_COUNT];
	struct mutex lock;
	struct work_struct work;
	enum led_brightness brightnesses[GT683R_LED_COUNT];
	enum gt683r_led_mode mode;
};

static const struct hid_device_id gt683r_led_id[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL) },
	{ }
};

static void gt683r_brightness_set(struct led_classdev *led_cdev,
				enum led_brightness brightness)
{
	int i;
	struct device *dev = led_cdev->dev->parent;
	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
	struct gt683r_led *led = hid_get_drvdata(hdev);

	for (i = 0; i < GT683R_LED_COUNT; i++) {
		if (led_cdev == &led->led_devs[i])
			break;
	}

	if (i < GT683R_LED_COUNT) {
		led->brightnesses[i] = brightness;
		schedule_work(&led->work);
	}
}

static ssize_t mode_show(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	u8 sysfs_mode;
	struct hid_device *hdev = container_of(dev->parent,
					struct hid_device, dev);
	struct gt683r_led *led = hid_get_drvdata(hdev);

	if (led->mode == GT683R_LED_NORMAL)
		sysfs_mode = 0;
	else if (led->mode == GT683R_LED_AUDIO)
		sysfs_mode = 1;
	else
		sysfs_mode = 2;

	return scnprintf(buf, PAGE_SIZE, "%u\n", sysfs_mode);
}

static ssize_t mode_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	u8 sysfs_mode;
	struct hid_device *hdev = container_of(dev->parent,
					struct hid_device, dev);
	struct gt683r_led *led = hid_get_drvdata(hdev);


	if (kstrtou8(buf, 10, &sysfs_mode) || sysfs_mode > 2)
		return -EINVAL;

	mutex_lock(&led->lock);

	if (sysfs_mode == 0)
		led->mode = GT683R_LED_NORMAL;
	else if (sysfs_mode == 1)
		led->mode = GT683R_LED_AUDIO;
	else
		led->mode = GT683R_LED_BREATHING;

	mutex_unlock(&led->lock);
	schedule_work(&led->work);

	return count;
}

static int gt683r_led_snd_msg(struct gt683r_led *led, u8 *msg)
{
	int ret;

	ret = hid_hw_raw_request(led->hdev, msg[0], msg, GT683R_BUFFER_SIZE,
				HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
	if (ret != GT683R_BUFFER_SIZE) {
		hid_err(led->hdev,
			"failed to send set report request: %i\n", ret);
		if (ret < 0)
			return ret;
		return -EIO;
	}

	return 0;
}

static int gt683r_leds_set(struct gt683r_led *led, u8 leds)
{
	int ret;
	u8 *buffer;

	buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	buffer[0] = 0x01;
	buffer[1] = 0x02;
	buffer[2] = 0x30;
	buffer[3] = leds;
	ret = gt683r_led_snd_msg(led, buffer);

	kfree(buffer);
	return ret;
}

static int gt683r_mode_set(struct gt683r_led *led, u8 mode)
{
	int ret;
	u8 *buffer;

	buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	buffer[0] = 0x01;
	buffer[1] = 0x02;
	buffer[2] = 0x20;
	buffer[3] = mode;
	buffer[4] = 0x01;
	ret = gt683r_led_snd_msg(led, buffer);

	kfree(buffer);
	return ret;
}

static void gt683r_led_work(struct work_struct *work)
{
	int i;
	u8 leds = 0;
	u8 mode;
	struct gt683r_led *led = container_of(work, struct gt683r_led, work);

	mutex_lock(&led->lock);

	for (i = 0; i < GT683R_LED_COUNT; i++) {
		if (led->brightnesses[i])
			leds |= BIT(i);
	}

	if (gt683r_leds_set(led, leds))
		goto fail;

	if (leds)
		mode = led->mode;
	else
		mode = GT683R_LED_OFF;

	gt683r_mode_set(led, mode);
fail:
	mutex_unlock(&led->lock);
}

static DEVICE_ATTR_RW(mode);

static struct attribute *gt683r_led_attrs[] = {
	&dev_attr_mode.attr,
	NULL
};

static const struct attribute_group gt683r_led_group = {
	.name = "gt683r",
	.attrs = gt683r_led_attrs,
};

static const struct attribute_group *gt683r_led_groups[] = {
	&gt683r_led_group,
	NULL
};

static int gt683r_led_probe(struct hid_device *hdev,
			const struct hid_device_id *id)
{
	int i;
	int ret;
	int name_sz;
	char *name;
	struct gt683r_led *led;

	led = devm_kzalloc(&hdev->dev, sizeof(*led), GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	mutex_init(&led->lock);
	INIT_WORK(&led->work, gt683r_led_work);

	led->mode = GT683R_LED_NORMAL;
	led->hdev = hdev;
	hid_set_drvdata(hdev, led);

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "hid parsing failed\n");
		return ret;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		return ret;
	}

	for (i = 0; i < GT683R_LED_COUNT; i++) {
		name_sz = strlen(dev_name(&hdev->dev)) +
				strlen(gt683r_panel_names[i]) + 3;

		name = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
		if (!name) {
			ret = -ENOMEM;
			goto fail;
		}

		snprintf(name, name_sz, "%s::%s",
				dev_name(&hdev->dev), gt683r_panel_names[i]);
		led->led_devs[i].name = name;
		led->led_devs[i].max_brightness = 1;
		led->led_devs[i].brightness_set = gt683r_brightness_set;
		led->led_devs[i].groups = gt683r_led_groups;

		ret = led_classdev_register(&hdev->dev, &led->led_devs[i]);
		if (ret) {
			hid_err(hdev, "could not register led device\n");
			goto fail;
		}
	}

	return 0;

fail:
	for (i = i - 1; i >= 0; i--)
		led_classdev_unregister(&led->led_devs[i]);
	hid_hw_stop(hdev);
	return ret;
}

static void gt683r_led_remove(struct hid_device *hdev)
{
	int i;
	struct gt683r_led *led = hid_get_drvdata(hdev);

	for (i = 0; i < GT683R_LED_COUNT; i++)
		led_classdev_unregister(&led->led_devs[i]);
	flush_work(&led->work);
	hid_hw_stop(hdev);
}

static struct hid_driver gt683r_led_driver = {
	.probe = gt683r_led_probe,
	.remove = gt683r_led_remove,
	.name = "gt683r_led",
	.id_table = gt683r_led_id,
};

module_hid_driver(gt683r_led_driver);

MODULE_AUTHOR("Janne Kanniainen");
MODULE_DESCRIPTION("MSI GT683R led driver");
MODULE_LICENSE("GPL");