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18#include <linux/device.h>
19#include <linux/hid.h>
20#include <linux/kernel.h>
21#include <linux/leds.h>
22#include <linux/module.h>
23
24#include "hid-ids.h"
25
26#define GT683R_BUFFER_SIZE 8
27
28
29
30
31
32
33
34enum gt683r_led_mode {
35 GT683R_LED_OFF = 0,
36 GT683R_LED_AUDIO = 2,
37 GT683R_LED_BREATHING = 3,
38 GT683R_LED_NORMAL = 5
39};
40
41enum gt683r_panels {
42 GT683R_LED_BACK = 0,
43 GT683R_LED_SIDE = 1,
44 GT683R_LED_FRONT = 2,
45 GT683R_LED_COUNT,
46};
47
48static const char * const gt683r_panel_names[] = {
49 "back",
50 "side",
51 "front",
52};
53
54struct gt683r_led {
55 struct hid_device *hdev;
56 struct led_classdev led_devs[GT683R_LED_COUNT];
57 struct mutex lock;
58 struct work_struct work;
59 enum led_brightness brightnesses[GT683R_LED_COUNT];
60 enum gt683r_led_mode mode;
61};
62
63static const struct hid_device_id gt683r_led_id[] = {
64 { HID_USB_DEVICE(USB_VENDOR_ID_MSI, USB_DEVICE_ID_MSI_GT683R_LED_PANEL) },
65 { }
66};
67
68static void gt683r_brightness_set(struct led_classdev *led_cdev,
69 enum led_brightness brightness)
70{
71 int i;
72 struct device *dev = led_cdev->dev->parent;
73 struct hid_device *hdev = container_of(dev, struct hid_device, dev);
74 struct gt683r_led *led = hid_get_drvdata(hdev);
75
76 for (i = 0; i < GT683R_LED_COUNT; i++) {
77 if (led_cdev == &led->led_devs[i])
78 break;
79 }
80
81 if (i < GT683R_LED_COUNT) {
82 led->brightnesses[i] = brightness;
83 schedule_work(&led->work);
84 }
85}
86
87static ssize_t mode_show(struct device *dev,
88 struct device_attribute *attr,
89 char *buf)
90{
91 u8 sysfs_mode;
92 struct hid_device *hdev = container_of(dev->parent,
93 struct hid_device, dev);
94 struct gt683r_led *led = hid_get_drvdata(hdev);
95
96 if (led->mode == GT683R_LED_NORMAL)
97 sysfs_mode = 0;
98 else if (led->mode == GT683R_LED_AUDIO)
99 sysfs_mode = 1;
100 else
101 sysfs_mode = 2;
102
103 return scnprintf(buf, PAGE_SIZE, "%u\n", sysfs_mode);
104}
105
106static ssize_t mode_store(struct device *dev,
107 struct device_attribute *attr,
108 const char *buf, size_t count)
109{
110 u8 sysfs_mode;
111 struct hid_device *hdev = container_of(dev->parent,
112 struct hid_device, dev);
113 struct gt683r_led *led = hid_get_drvdata(hdev);
114
115
116 if (kstrtou8(buf, 10, &sysfs_mode) || sysfs_mode > 2)
117 return -EINVAL;
118
119 mutex_lock(&led->lock);
120
121 if (sysfs_mode == 0)
122 led->mode = GT683R_LED_NORMAL;
123 else if (sysfs_mode == 1)
124 led->mode = GT683R_LED_AUDIO;
125 else
126 led->mode = GT683R_LED_BREATHING;
127
128 mutex_unlock(&led->lock);
129 schedule_work(&led->work);
130
131 return count;
132}
133
134static int gt683r_led_snd_msg(struct gt683r_led *led, u8 *msg)
135{
136 int ret;
137
138 ret = hid_hw_raw_request(led->hdev, msg[0], msg, GT683R_BUFFER_SIZE,
139 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
140 if (ret != GT683R_BUFFER_SIZE) {
141 hid_err(led->hdev,
142 "failed to send set report request: %i\n", ret);
143 if (ret < 0)
144 return ret;
145 return -EIO;
146 }
147
148 return 0;
149}
150
151static int gt683r_leds_set(struct gt683r_led *led, u8 leds)
152{
153 int ret;
154 u8 *buffer;
155
156 buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
157 if (!buffer)
158 return -ENOMEM;
159
160 buffer[0] = 0x01;
161 buffer[1] = 0x02;
162 buffer[2] = 0x30;
163 buffer[3] = leds;
164 ret = gt683r_led_snd_msg(led, buffer);
165
166 kfree(buffer);
167 return ret;
168}
169
170static int gt683r_mode_set(struct gt683r_led *led, u8 mode)
171{
172 int ret;
173 u8 *buffer;
174
175 buffer = kzalloc(GT683R_BUFFER_SIZE, GFP_KERNEL);
176 if (!buffer)
177 return -ENOMEM;
178
179 buffer[0] = 0x01;
180 buffer[1] = 0x02;
181 buffer[2] = 0x20;
182 buffer[3] = mode;
183 buffer[4] = 0x01;
184 ret = gt683r_led_snd_msg(led, buffer);
185
186 kfree(buffer);
187 return ret;
188}
189
190static void gt683r_led_work(struct work_struct *work)
191{
192 int i;
193 u8 leds = 0;
194 u8 mode;
195 struct gt683r_led *led = container_of(work, struct gt683r_led, work);
196
197 mutex_lock(&led->lock);
198
199 for (i = 0; i < GT683R_LED_COUNT; i++) {
200 if (led->brightnesses[i])
201 leds |= BIT(i);
202 }
203
204 if (gt683r_leds_set(led, leds))
205 goto fail;
206
207 if (leds)
208 mode = led->mode;
209 else
210 mode = GT683R_LED_OFF;
211
212 gt683r_mode_set(led, mode);
213fail:
214 mutex_unlock(&led->lock);
215}
216
217static DEVICE_ATTR_RW(mode);
218
219static struct attribute *gt683r_led_attrs[] = {
220 &dev_attr_mode.attr,
221 NULL
222};
223
224static const struct attribute_group gt683r_led_group = {
225 .name = "gt683r",
226 .attrs = gt683r_led_attrs,
227};
228
229static const struct attribute_group *gt683r_led_groups[] = {
230 >683r_led_group,
231 NULL
232};
233
234static int gt683r_led_probe(struct hid_device *hdev,
235 const struct hid_device_id *id)
236{
237 int i;
238 int ret;
239 int name_sz;
240 char *name;
241 struct gt683r_led *led;
242
243 led = devm_kzalloc(&hdev->dev, sizeof(*led), GFP_KERNEL);
244 if (!led)
245 return -ENOMEM;
246
247 mutex_init(&led->lock);
248 INIT_WORK(&led->work, gt683r_led_work);
249
250 led->mode = GT683R_LED_NORMAL;
251 led->hdev = hdev;
252 hid_set_drvdata(hdev, led);
253
254 ret = hid_parse(hdev);
255 if (ret) {
256 hid_err(hdev, "hid parsing failed\n");
257 return ret;
258 }
259
260 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
261 if (ret) {
262 hid_err(hdev, "hw start failed\n");
263 return ret;
264 }
265
266 for (i = 0; i < GT683R_LED_COUNT; i++) {
267 name_sz = strlen(dev_name(&hdev->dev)) +
268 strlen(gt683r_panel_names[i]) + 3;
269
270 name = devm_kzalloc(&hdev->dev, name_sz, GFP_KERNEL);
271 if (!name) {
272 ret = -ENOMEM;
273 goto fail;
274 }
275
276 snprintf(name, name_sz, "%s::%s",
277 dev_name(&hdev->dev), gt683r_panel_names[i]);
278 led->led_devs[i].name = name;
279 led->led_devs[i].max_brightness = 1;
280 led->led_devs[i].brightness_set = gt683r_brightness_set;
281 led->led_devs[i].groups = gt683r_led_groups;
282
283 ret = led_classdev_register(&hdev->dev, &led->led_devs[i]);
284 if (ret) {
285 hid_err(hdev, "could not register led device\n");
286 goto fail;
287 }
288 }
289
290 return 0;
291
292fail:
293 for (i = i - 1; i >= 0; i--)
294 led_classdev_unregister(&led->led_devs[i]);
295 hid_hw_stop(hdev);
296 return ret;
297}
298
299static void gt683r_led_remove(struct hid_device *hdev)
300{
301 int i;
302 struct gt683r_led *led = hid_get_drvdata(hdev);
303
304 for (i = 0; i < GT683R_LED_COUNT; i++)
305 led_classdev_unregister(&led->led_devs[i]);
306 flush_work(&led->work);
307 hid_hw_stop(hdev);
308}
309
310static struct hid_driver gt683r_led_driver = {
311 .probe = gt683r_led_probe,
312 .remove = gt683r_led_remove,
313 .name = "gt683r_led",
314 .id_table = gt683r_led_id,
315};
316
317module_hid_driver(gt683r_led_driver);
318
319MODULE_AUTHOR("Janne Kanniainen");
320MODULE_DESCRIPTION("MSI GT683R led driver");
321MODULE_LICENSE("GPL");
322
