Commit | Line | Data |
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30ba2fbd VD |
1 | /* |
2 | * ThingM blink(1) USB RGB LED driver | |
3 | * | |
f70ed8a6 | 4 | * Copyright 2013-2014 Savoir-faire Linux Inc. |
30ba2fbd VD |
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> | |
f70ed8a6 | 13 | #include <linux/hidraw.h> |
30ba2fbd VD |
14 | #include <linux/leds.h> |
15 | #include <linux/module.h> | |
f70ed8a6 | 16 | #include <linux/mutex.h> |
30ba2fbd VD |
17 | |
18 | #include "hid-ids.h" | |
19 | ||
f70ed8a6 VD |
20 | #define REPORT_ID 1 |
21 | #define REPORT_SIZE 9 | |
30ba2fbd | 22 | |
f70ed8a6 VD |
23 | /* Firmware major number of supported devices */ |
24 | #define THINGM_MAJOR_MK1 '1' | |
3121b1c4 | 25 | #define THINGM_MAJOR_MK2 '2' |
30ba2fbd | 26 | |
f70ed8a6 VD |
27 | struct thingm_fwinfo { |
28 | char major; | |
29 | unsigned numrgb; | |
30 | unsigned first; | |
31 | }; | |
32 | ||
e4aecaf2 | 33 | static const struct thingm_fwinfo thingm_fwinfo[] = { |
f70ed8a6 VD |
34 | { |
35 | .major = THINGM_MAJOR_MK1, | |
36 | .numrgb = 1, | |
37 | .first = 0, | |
3121b1c4 VD |
38 | }, { |
39 | .major = THINGM_MAJOR_MK2, | |
40 | .numrgb = 2, | |
41 | .first = 1, | |
f70ed8a6 VD |
42 | } |
43 | }; | |
44 | ||
45 | /* A red, green or blue channel, part of an RGB chip */ | |
46 | struct thingm_led { | |
47 | struct thingm_rgb *rgb; | |
48 | struct led_classdev ldev; | |
49 | char name[32]; | |
50 | }; | |
51 | ||
52 | /* Basically a WS2812 5050 RGB LED chip */ | |
53 | struct thingm_rgb { | |
54 | struct thingm_device *tdev; | |
55 | struct thingm_led red; | |
56 | struct thingm_led green; | |
57 | struct thingm_led blue; | |
f70ed8a6 VD |
58 | u8 num; |
59 | }; | |
60 | ||
61 | struct thingm_device { | |
30ba2fbd | 62 | struct hid_device *hdev; |
f70ed8a6 VD |
63 | struct { |
64 | char major; | |
65 | char minor; | |
66 | } version; | |
67 | const struct thingm_fwinfo *fwinfo; | |
68 | struct mutex lock; | |
69 | struct thingm_rgb *rgb; | |
30ba2fbd VD |
70 | }; |
71 | ||
f70ed8a6 | 72 | static int thingm_send(struct thingm_device *tdev, u8 buf[REPORT_SIZE]) |
30ba2fbd VD |
73 | { |
74 | int ret; | |
75 | ||
f70ed8a6 | 76 | hid_dbg(tdev->hdev, "-> %d %c %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\n", |
30ba2fbd VD |
77 | buf[0], buf[1], buf[2], buf[3], buf[4], |
78 | buf[5], buf[6], buf[7], buf[8]); | |
79 | ||
f70ed8a6 VD |
80 | ret = hid_hw_raw_request(tdev->hdev, buf[0], buf, REPORT_SIZE, |
81 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); | |
30ba2fbd VD |
82 | |
83 | return ret < 0 ? ret : 0; | |
84 | } | |
85 | ||
f70ed8a6 | 86 | static int thingm_recv(struct thingm_device *tdev, u8 buf[REPORT_SIZE]) |
30ba2fbd | 87 | { |
f70ed8a6 | 88 | int ret; |
30ba2fbd | 89 | |
f70ed8a6 VD |
90 | ret = hid_hw_raw_request(tdev->hdev, buf[0], buf, REPORT_SIZE, |
91 | HID_FEATURE_REPORT, HID_REQ_GET_REPORT); | |
92 | if (ret < 0) | |
93 | return ret; | |
30ba2fbd | 94 | |
f70ed8a6 VD |
95 | hid_dbg(tdev->hdev, "<- %d %c %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\n", |
96 | buf[0], buf[1], buf[2], buf[3], buf[4], | |
97 | buf[5], buf[6], buf[7], buf[8]); | |
30ba2fbd | 98 | |
f70ed8a6 | 99 | return 0; |
30ba2fbd VD |
100 | } |
101 | ||
f70ed8a6 | 102 | static int thingm_version(struct thingm_device *tdev) |
30ba2fbd | 103 | { |
f70ed8a6 VD |
104 | u8 buf[REPORT_SIZE] = { REPORT_ID, 'v', 0, 0, 0, 0, 0, 0, 0 }; |
105 | int err; | |
106 | ||
107 | err = thingm_send(tdev, buf); | |
108 | if (err) | |
109 | return err; | |
110 | ||
111 | err = thingm_recv(tdev, buf); | |
112 | if (err) | |
113 | return err; | |
30ba2fbd | 114 | |
f70ed8a6 VD |
115 | tdev->version.major = buf[3]; |
116 | tdev->version.minor = buf[4]; | |
117 | ||
118 | return 0; | |
30ba2fbd VD |
119 | } |
120 | ||
f70ed8a6 | 121 | static int thingm_write_color(struct thingm_rgb *rgb) |
30ba2fbd | 122 | { |
3121b1c4 | 123 | u8 buf[REPORT_SIZE] = { REPORT_ID, 'c', 0, 0, 0, 0, 0, rgb->num, 0 }; |
f70ed8a6 VD |
124 | |
125 | buf[2] = rgb->red.ldev.brightness; | |
126 | buf[3] = rgb->green.ldev.brightness; | |
127 | buf[4] = rgb->blue.ldev.brightness; | |
30ba2fbd | 128 | |
f70ed8a6 | 129 | return thingm_send(rgb->tdev, buf); |
30ba2fbd VD |
130 | } |
131 | ||
3de68ce9 HK |
132 | static int thingm_led_set(struct led_classdev *ldev, |
133 | enum led_brightness brightness) | |
30ba2fbd | 134 | { |
3de68ce9 HK |
135 | struct thingm_led *led = container_of(ldev, struct thingm_led, ldev); |
136 | int ret; | |
30ba2fbd | 137 | |
3de68ce9 | 138 | mutex_lock(&led->rgb->tdev->lock); |
f70ed8a6 | 139 | |
3de68ce9 HK |
140 | ret = thingm_write_color(led->rgb); |
141 | if (ret) | |
142 | hid_err(led->rgb->tdev->hdev, "failed to write color\n"); | |
f70ed8a6 | 143 | |
3de68ce9 | 144 | mutex_unlock(&led->rgb->tdev->lock); |
30ba2fbd | 145 | |
3de68ce9 | 146 | return ret; |
f70ed8a6 | 147 | } |
30ba2fbd | 148 | |
f70ed8a6 VD |
149 | static int thingm_init_rgb(struct thingm_rgb *rgb) |
150 | { | |
151 | const int minor = ((struct hidraw *) rgb->tdev->hdev->hidraw)->minor; | |
152 | int err; | |
153 | ||
154 | /* Register the red diode */ | |
155 | snprintf(rgb->red.name, sizeof(rgb->red.name), | |
156 | "thingm%d:red:led%d", minor, rgb->num); | |
157 | rgb->red.ldev.name = rgb->red.name; | |
158 | rgb->red.ldev.max_brightness = 255; | |
3de68ce9 | 159 | rgb->red.ldev.brightness_set_blocking = thingm_led_set; |
f70ed8a6 VD |
160 | rgb->red.rgb = rgb; |
161 | ||
162 | err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->red.ldev); | |
163 | if (err) | |
164 | return err; | |
165 | ||
166 | /* Register the green diode */ | |
167 | snprintf(rgb->green.name, sizeof(rgb->green.name), | |
168 | "thingm%d:green:led%d", minor, rgb->num); | |
169 | rgb->green.ldev.name = rgb->green.name; | |
170 | rgb->green.ldev.max_brightness = 255; | |
3de68ce9 | 171 | rgb->green.ldev.brightness_set_blocking = thingm_led_set; |
f70ed8a6 VD |
172 | rgb->green.rgb = rgb; |
173 | ||
174 | err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->green.ldev); | |
175 | if (err) | |
176 | goto unregister_red; | |
177 | ||
178 | /* Register the blue diode */ | |
179 | snprintf(rgb->blue.name, sizeof(rgb->blue.name), | |
180 | "thingm%d:blue:led%d", minor, rgb->num); | |
181 | rgb->blue.ldev.name = rgb->blue.name; | |
182 | rgb->blue.ldev.max_brightness = 255; | |
3de68ce9 | 183 | rgb->blue.ldev.brightness_set_blocking = thingm_led_set; |
f70ed8a6 VD |
184 | rgb->blue.rgb = rgb; |
185 | ||
186 | err = led_classdev_register(&rgb->tdev->hdev->dev, &rgb->blue.ldev); | |
187 | if (err) | |
188 | goto unregister_green; | |
189 | ||
f70ed8a6 | 190 | return 0; |
30ba2fbd | 191 | |
f70ed8a6 VD |
192 | unregister_green: |
193 | led_classdev_unregister(&rgb->green.ldev); | |
30ba2fbd | 194 | |
f70ed8a6 VD |
195 | unregister_red: |
196 | led_classdev_unregister(&rgb->red.ldev); | |
30ba2fbd | 197 | |
f70ed8a6 VD |
198 | return err; |
199 | } | |
200 | ||
201 | static void thingm_remove_rgb(struct thingm_rgb *rgb) | |
202 | { | |
f70ed8a6 VD |
203 | led_classdev_unregister(&rgb->red.ldev); |
204 | led_classdev_unregister(&rgb->green.ldev); | |
205 | led_classdev_unregister(&rgb->blue.ldev); | |
206 | } | |
30ba2fbd VD |
207 | |
208 | static int thingm_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
209 | { | |
f70ed8a6 VD |
210 | struct thingm_device *tdev; |
211 | int i, err; | |
30ba2fbd | 212 | |
f70ed8a6 VD |
213 | tdev = devm_kzalloc(&hdev->dev, sizeof(struct thingm_device), |
214 | GFP_KERNEL); | |
215 | if (!tdev) | |
30ba2fbd VD |
216 | return -ENOMEM; |
217 | ||
f70ed8a6 VD |
218 | tdev->hdev = hdev; |
219 | hid_set_drvdata(hdev, tdev); | |
30ba2fbd | 220 | |
f70ed8a6 VD |
221 | err = hid_parse(hdev); |
222 | if (err) | |
30ba2fbd VD |
223 | goto error; |
224 | ||
f70ed8a6 VD |
225 | err = hid_hw_start(hdev, HID_CONNECT_HIDRAW); |
226 | if (err) | |
30ba2fbd VD |
227 | goto error; |
228 | ||
f70ed8a6 VD |
229 | mutex_init(&tdev->lock); |
230 | ||
231 | err = thingm_version(tdev); | |
232 | if (err) | |
30ba2fbd VD |
233 | goto stop; |
234 | ||
f70ed8a6 VD |
235 | hid_dbg(hdev, "firmware version: %c.%c\n", |
236 | tdev->version.major, tdev->version.minor); | |
30ba2fbd | 237 | |
f70ed8a6 VD |
238 | for (i = 0; i < ARRAY_SIZE(thingm_fwinfo) && !tdev->fwinfo; ++i) |
239 | if (thingm_fwinfo[i].major == tdev->version.major) | |
240 | tdev->fwinfo = &thingm_fwinfo[i]; | |
241 | ||
242 | if (!tdev->fwinfo) { | |
243 | hid_err(hdev, "unsupported firmware %c\n", tdev->version.major); | |
e4cf19ff | 244 | err = -ENODEV; |
f70ed8a6 VD |
245 | goto stop; |
246 | } | |
247 | ||
248 | tdev->rgb = devm_kzalloc(&hdev->dev, | |
249 | sizeof(struct thingm_rgb) * tdev->fwinfo->numrgb, | |
250 | GFP_KERNEL); | |
251 | if (!tdev->rgb) { | |
252 | err = -ENOMEM; | |
253 | goto stop; | |
254 | } | |
255 | ||
256 | for (i = 0; i < tdev->fwinfo->numrgb; ++i) { | |
257 | struct thingm_rgb *rgb = tdev->rgb + i; | |
258 | ||
259 | rgb->tdev = tdev; | |
260 | rgb->num = tdev->fwinfo->first + i; | |
261 | err = thingm_init_rgb(rgb); | |
262 | if (err) { | |
263 | while (--i >= 0) | |
264 | thingm_remove_rgb(tdev->rgb + i); | |
265 | goto stop; | |
266 | } | |
267 | } | |
30ba2fbd | 268 | |
f70ed8a6 | 269 | return 0; |
30ba2fbd VD |
270 | stop: |
271 | hid_hw_stop(hdev); | |
272 | error: | |
f70ed8a6 | 273 | return err; |
30ba2fbd VD |
274 | } |
275 | ||
276 | static void thingm_remove(struct hid_device *hdev) | |
277 | { | |
f70ed8a6 VD |
278 | struct thingm_device *tdev = hid_get_drvdata(hdev); |
279 | int i; | |
280 | ||
67a97845 JK |
281 | hid_hw_stop(hdev); |
282 | ||
f70ed8a6 VD |
283 | for (i = 0; i < tdev->fwinfo->numrgb; ++i) |
284 | thingm_remove_rgb(tdev->rgb + i); | |
30ba2fbd VD |
285 | } |
286 | ||
287 | static const struct hid_device_id thingm_table[] = { | |
288 | { HID_USB_DEVICE(USB_VENDOR_ID_THINGM, USB_DEVICE_ID_BLINK1) }, | |
289 | { } | |
290 | }; | |
291 | MODULE_DEVICE_TABLE(hid, thingm_table); | |
292 | ||
293 | static struct hid_driver thingm_driver = { | |
294 | .name = "thingm", | |
295 | .probe = thingm_probe, | |
296 | .remove = thingm_remove, | |
297 | .id_table = thingm_table, | |
298 | }; | |
299 | ||
300 | module_hid_driver(thingm_driver); | |
301 | ||
302 | MODULE_LICENSE("GPL"); | |
303 | MODULE_AUTHOR("Vivien Didelot <vivien.didelot@savoirfairelinux.com>"); | |
304 | MODULE_DESCRIPTION("ThingM blink(1) USB RGB LED driver"); |