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1 | /* | |
2 | * ThingM blink(1) USB RGB LED driver | |
3 | * | |
4 | * Copyright 2013-2014 Savoir-faire Linux Inc. | |
5 | * Vivien Didelot <vivien.didelot@savoirfairelinux.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation, version 2. | |
10 | */ | |
11 | ||
12 | #include <linux/hid.h> | |
13 | #include <linux/hidraw.h> | |
14 | #include <linux/leds.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/mutex.h> | |
17 | #include <linux/workqueue.h> | |
18 | ||
19 | #include "hid-ids.h" | |
20 | ||
21 | #define REPORT_ID 1 | |
22 | #define REPORT_SIZE 9 | |
23 | ||
24 | /* Firmware major number of supported devices */ | |
25 | #define THINGM_MAJOR_MK1 '1' | |
26 | #define THINGM_MAJOR_MK2 '2' | |
27 | ||
28 | struct thingm_fwinfo { | |
29 | char major; | |
30 | unsigned numrgb; | |
31 | unsigned first; | |
32 | }; | |
33 | ||
34 | static const struct thingm_fwinfo thingm_fwinfo[] = { | |
35 | { | |
36 | .major = THINGM_MAJOR_MK1, | |
37 | .numrgb = 1, | |
38 | .first = 0, | |
39 | }, { | |
40 | .major = THINGM_MAJOR_MK2, | |
41 | .numrgb = 2, | |
42 | .first = 1, | |
43 | } | |
44 | }; | |
45 | ||
46 | /* A red, green or blue channel, part of an RGB chip */ | |
47 | struct thingm_led { | |
48 | struct thingm_rgb *rgb; | |
49 | struct led_classdev ldev; | |
50 | char name[32]; | |
51 | }; | |
52 | ||
53 | /* Basically a WS2812 5050 RGB LED chip */ | |
54 | struct thingm_rgb { | |
55 | struct thingm_device *tdev; | |
56 | struct thingm_led red; | |
57 | struct thingm_led green; | |
58 | struct thingm_led blue; | |
59 | struct work_struct work; | |
60 | u8 num; | |
61 | }; | |
62 | ||
63 | struct thingm_device { | |
64 | struct hid_device *hdev; | |
65 | struct { | |
66 | char major; | |
67 | char minor; | |
68 | } version; | |
69 | const struct thingm_fwinfo *fwinfo; | |
70 | struct mutex lock; | |
71 | struct thingm_rgb *rgb; | |
72 | }; | |
73 | ||
74 | static int thingm_send(struct thingm_device *tdev, u8 buf[REPORT_SIZE]) | |
75 | { | |
76 | int ret; | |
77 | ||
78 | hid_dbg(tdev->hdev, "-> %d %c %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\n", | |
79 | buf[0], buf[1], buf[2], buf[3], buf[4], | |
80 | buf[5], buf[6], buf[7], buf[8]); | |
81 | ||
82 | ret = hid_hw_raw_request(tdev->hdev, buf[0], buf, REPORT_SIZE, | |
83 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); | |
84 | ||
85 | return ret < 0 ? ret : 0; | |
86 | } | |
87 | ||
88 | static int thingm_recv(struct thingm_device *tdev, u8 buf[REPORT_SIZE]) | |
89 | { | |
90 | int ret; | |
91 | ||
92 | ret = hid_hw_raw_request(tdev->hdev, buf[0], buf, REPORT_SIZE, | |
93 | HID_FEATURE_REPORT, HID_REQ_GET_REPORT); | |
94 | if (ret < 0) | |
95 | return ret; | |
96 | ||
97 | hid_dbg(tdev->hdev, "<- %d %c %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\n", | |
98 | buf[0], buf[1], buf[2], buf[3], buf[4], | |
99 | buf[5], buf[6], buf[7], buf[8]); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int thingm_version(struct thingm_device *tdev) | |
105 | { | |
106 | u8 buf[REPORT_SIZE] = { REPORT_ID, 'v', 0, 0, 0, 0, 0, 0, 0 }; | |
107 | int err; | |
108 | ||
109 | err = thingm_send(tdev, buf); | |
110 | if (err) | |
111 | return err; | |
112 | ||
113 | err = thingm_recv(tdev, buf); | |
114 | if (err) | |
115 | return err; | |
116 | ||
117 | tdev->version.major = buf[3]; | |
118 | tdev->version.minor = buf[4]; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int thingm_write_color(struct thingm_rgb *rgb) | |
124 | { | |
125 | u8 buf[REPORT_SIZE] = { REPORT_ID, 'c', 0, 0, 0, 0, 0, rgb->num, 0 }; | |
126 | ||
127 | buf[2] = rgb->red.ldev.brightness; | |
128 | buf[3] = rgb->green.ldev.brightness; | |
129 | buf[4] = rgb->blue.ldev.brightness; | |
130 | ||
131 | return thingm_send(rgb->tdev, buf); | |
132 | } | |
133 | ||
134 | static void thingm_work(struct work_struct *work) | |
135 | { | |
136 | struct thingm_rgb *rgb = container_of(work, struct thingm_rgb, work); | |
137 | ||
138 | mutex_lock(&rgb->tdev->lock); | |
139 | ||
140 | if (thingm_write_color(rgb)) | |
141 | hid_err(rgb->tdev->hdev, "failed to write color\n"); | |
142 | ||
143 | mutex_unlock(&rgb->tdev->lock); | |
144 | } | |
145 | ||
146 | static void thingm_led_set(struct led_classdev *ldev, | |
147 | enum led_brightness brightness) | |
148 | { | |
149 | struct thingm_led *led = container_of(ldev, struct thingm_led, ldev); | |
150 | ||
151 | /* the ledclass has already stored the brightness value */ | |
152 | schedule_work(&led->rgb->work); | |
153 | } | |
154 | ||
155 | static int thingm_init_rgb(struct thingm_rgb *rgb) | |
156 | { | |
157 | const int minor = ((struct hidraw *) rgb->tdev->hdev->hidraw)->minor; | |
158 | int err; | |
159 | ||
160 | /* Register the red diode */ | |
161 | snprintf(rgb->red.name, sizeof(rgb->red.name), | |
162 | "thingm%d:red:led%d", minor, rgb->num); | |
163 | rgb->red.ldev.name = rgb->red.name; | |
164 | rgb->red.ldev.max_brightness = 255; | |
165 | rgb->red.ldev.brightness_set = thingm_led_set; | |
166 | rgb->red.rgb = rgb; | |
167 | ||
168 | err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->red.ldev); | |
169 | if (err) | |
170 | return err; | |
171 | ||
172 | /* Register the green diode */ | |
173 | snprintf(rgb->green.name, sizeof(rgb->green.name), | |
174 | "thingm%d:green:led%d", minor, rgb->num); | |
175 | rgb->green.ldev.name = rgb->green.name; | |
176 | rgb->green.ldev.max_brightness = 255; | |
177 | rgb->green.ldev.brightness_set = thingm_led_set; | |
178 | rgb->green.rgb = rgb; | |
179 | ||
180 | err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->green.ldev); | |
181 | if (err) | |
182 | goto unregister_red; | |
183 | ||
184 | /* Register the blue diode */ | |
185 | snprintf(rgb->blue.name, sizeof(rgb->blue.name), | |
186 | "thingm%d:blue:led%d", minor, rgb->num); | |
187 | rgb->blue.ldev.name = rgb->blue.name; | |
188 | rgb->blue.ldev.max_brightness = 255; | |
189 | rgb->blue.ldev.brightness_set = thingm_led_set; | |
190 | rgb->blue.rgb = rgb; | |
191 | ||
192 | err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->blue.ldev); | |
193 | if (err) | |
194 | goto unregister_green; | |
195 | ||
196 | INIT_WORK(&rgb->work, thingm_work); | |
197 | ||
198 | return 0; | |
199 | ||
200 | unregister_green: | |
201 | led_classdev_unregister(&rgb->green.ldev); | |
202 | ||
203 | unregister_red: | |
204 | led_classdev_unregister(&rgb->red.ldev); | |
205 | ||
206 | return err; | |
207 | } | |
208 | ||
209 | static void thingm_remove_rgb(struct thingm_rgb *rgb) | |
210 | { | |
211 | flush_work(&rgb->work); | |
212 | led_classdev_unregister(&rgb->red.ldev); | |
213 | led_classdev_unregister(&rgb->green.ldev); | |
214 | led_classdev_unregister(&rgb->blue.ldev); | |
215 | } | |
216 | ||
217 | static int thingm_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
218 | { | |
219 | struct thingm_device *tdev; | |
220 | int i, err; | |
221 | ||
222 | tdev = devm_kzalloc(&hdev->dev, sizeof(struct thingm_device), | |
223 | GFP_KERNEL); | |
224 | if (!tdev) | |
225 | return -ENOMEM; | |
226 | ||
227 | tdev->hdev = hdev; | |
228 | hid_set_drvdata(hdev, tdev); | |
229 | ||
230 | err = hid_parse(hdev); | |
231 | if (err) | |
232 | goto error; | |
233 | ||
234 | err = hid_hw_start(hdev, HID_CONNECT_HIDRAW); | |
235 | if (err) | |
236 | goto error; | |
237 | ||
238 | mutex_init(&tdev->lock); | |
239 | ||
240 | err = thingm_version(tdev); | |
241 | if (err) | |
242 | goto stop; | |
243 | ||
244 | hid_dbg(hdev, "firmware version: %c.%c\n", | |
245 | tdev->version.major, tdev->version.minor); | |
246 | ||
247 | for (i = 0; i < ARRAY_SIZE(thingm_fwinfo) && !tdev->fwinfo; ++i) | |
248 | if (thingm_fwinfo[i].major == tdev->version.major) | |
249 | tdev->fwinfo = &thingm_fwinfo[i]; | |
250 | ||
251 | if (!tdev->fwinfo) { | |
252 | hid_err(hdev, "unsupported firmware %c\n", tdev->version.major); | |
253 | goto stop; | |
254 | } | |
255 | ||
256 | tdev->rgb = devm_kzalloc(&hdev->dev, | |
257 | sizeof(struct thingm_rgb) * tdev->fwinfo->numrgb, | |
258 | GFP_KERNEL); | |
259 | if (!tdev->rgb) { | |
260 | err = -ENOMEM; | |
261 | goto stop; | |
262 | } | |
263 | ||
264 | for (i = 0; i < tdev->fwinfo->numrgb; ++i) { | |
265 | struct thingm_rgb *rgb = tdev->rgb + i; | |
266 | ||
267 | rgb->tdev = tdev; | |
268 | rgb->num = tdev->fwinfo->first + i; | |
269 | err = thingm_init_rgb(rgb); | |
270 | if (err) { | |
271 | while (--i >= 0) | |
272 | thingm_remove_rgb(tdev->rgb + i); | |
273 | goto stop; | |
274 | } | |
275 | } | |
276 | ||
277 | return 0; | |
278 | stop: | |
279 | hid_hw_stop(hdev); | |
280 | error: | |
281 | return err; | |
282 | } | |
283 | ||
284 | static void thingm_remove(struct hid_device *hdev) | |
285 | { | |
286 | struct thingm_device *tdev = hid_get_drvdata(hdev); | |
287 | int i; | |
288 | ||
289 | for (i = 0; i < tdev->fwinfo->numrgb; ++i) | |
290 | thingm_remove_rgb(tdev->rgb + i); | |
291 | ||
292 | hid_hw_stop(hdev); | |
293 | } | |
294 | ||
295 | static const struct hid_device_id thingm_table[] = { | |
296 | { HID_USB_DEVICE(USB_VENDOR_ID_THINGM, USB_DEVICE_ID_BLINK1) }, | |
297 | { } | |
298 | }; | |
299 | MODULE_DEVICE_TABLE(hid, thingm_table); | |
300 | ||
301 | static struct hid_driver thingm_driver = { | |
302 | .name = "thingm", | |
303 | .probe = thingm_probe, | |
304 | .remove = thingm_remove, | |
305 | .id_table = thingm_table, | |
306 | }; | |
307 | ||
308 | module_hid_driver(thingm_driver); | |
309 | ||
310 | MODULE_LICENSE("GPL"); | |
311 | MODULE_AUTHOR("Vivien Didelot <vivien.didelot@savoirfairelinux.com>"); | |
312 | MODULE_DESCRIPTION("ThingM blink(1) USB RGB LED driver"); |