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b54cf35a JSM |
1 | /* |
2 | * leds-blinkm.c | |
3 | * (c) Jan-Simon Möller (dl9pf@gmx.de) | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/jiffies.h> | |
24 | #include <linux/i2c.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/sysfs.h> | |
28 | #include <linux/printk.h> | |
29 | #include <linux/pm_runtime.h> | |
30 | #include <linux/leds.h> | |
31 | #include <linux/delay.h> | |
32 | ||
33 | /* Addresses to scan - BlinkM is on 0x09 by default*/ | |
34 | static const unsigned short normal_i2c[] = { 0x09, I2C_CLIENT_END }; | |
35 | ||
36 | static int blinkm_transfer_hw(struct i2c_client *client, int cmd); | |
37 | static int blinkm_test_run(struct i2c_client *client); | |
38 | ||
39 | struct blinkm_led { | |
40 | struct i2c_client *i2c_client; | |
41 | struct led_classdev led_cdev; | |
42 | int id; | |
43 | atomic_t active; | |
44 | }; | |
45 | ||
46 | struct blinkm_work { | |
47 | struct blinkm_led *blinkm_led; | |
48 | struct work_struct work; | |
49 | }; | |
50 | ||
51 | #define cdev_to_blmled(c) container_of(c, struct blinkm_led, led_cdev) | |
52 | #define work_to_blmwork(c) container_of(c, struct blinkm_work, work) | |
53 | ||
54 | struct blinkm_data { | |
55 | struct i2c_client *i2c_client; | |
56 | struct mutex update_lock; | |
57 | /* used for led class interface */ | |
58 | struct blinkm_led blinkm_leds[3]; | |
59 | /* used for "blinkm" sysfs interface */ | |
60 | u8 red; /* color red */ | |
61 | u8 green; /* color green */ | |
62 | u8 blue; /* color blue */ | |
63 | /* next values to use for transfer */ | |
64 | u8 next_red; /* color red */ | |
65 | u8 next_green; /* color green */ | |
66 | u8 next_blue; /* color blue */ | |
67 | /* internal use */ | |
68 | u8 args[7]; /* set of args for transmission */ | |
69 | u8 i2c_addr; /* i2c addr */ | |
70 | u8 fw_ver; /* firmware version */ | |
71 | /* used, but not from userspace */ | |
72 | u8 hue; /* HSB hue */ | |
73 | u8 saturation; /* HSB saturation */ | |
74 | u8 brightness; /* HSB brightness */ | |
75 | u8 next_hue; /* HSB hue */ | |
76 | u8 next_saturation; /* HSB saturation */ | |
77 | u8 next_brightness; /* HSB brightness */ | |
78 | /* currently unused / todo */ | |
79 | u8 fade_speed; /* fade speed 1 - 255 */ | |
80 | s8 time_adjust; /* time adjust -128 - 127 */ | |
81 | u8 fade:1; /* fade on = 1, off = 0 */ | |
82 | u8 rand:1; /* rand fade mode on = 1 */ | |
83 | u8 script_id; /* script ID */ | |
84 | u8 script_repeats; /* repeats of script */ | |
85 | u8 script_startline; /* line to start */ | |
86 | }; | |
87 | ||
88 | /* Colors */ | |
89 | #define RED 0 | |
90 | #define GREEN 1 | |
91 | #define BLUE 2 | |
92 | ||
93 | /* mapping command names to cmd chars - see datasheet */ | |
94 | #define BLM_GO_RGB 0 | |
95 | #define BLM_FADE_RGB 1 | |
96 | #define BLM_FADE_HSB 2 | |
97 | #define BLM_FADE_RAND_RGB 3 | |
98 | #define BLM_FADE_RAND_HSB 4 | |
99 | #define BLM_PLAY_SCRIPT 5 | |
100 | #define BLM_STOP_SCRIPT 6 | |
101 | #define BLM_SET_FADE_SPEED 7 | |
102 | #define BLM_SET_TIME_ADJ 8 | |
103 | #define BLM_GET_CUR_RGB 9 | |
104 | #define BLM_WRITE_SCRIPT_LINE 10 | |
105 | #define BLM_READ_SCRIPT_LINE 11 | |
106 | #define BLM_SET_SCRIPT_LR 12 /* Length & Repeats */ | |
107 | #define BLM_SET_ADDR 13 | |
108 | #define BLM_GET_ADDR 14 | |
109 | #define BLM_GET_FW_VER 15 | |
110 | #define BLM_SET_STARTUP_PARAM 16 | |
111 | ||
112 | /* BlinkM Commands | |
113 | * as extracted out of the datasheet: | |
114 | * | |
115 | * cmdchar = command (ascii) | |
116 | * cmdbyte = command in hex | |
117 | * nr_args = number of arguments (to send) | |
118 | * nr_ret = number of return values (to read) | |
119 | * dir = direction (0 = read, 1 = write, 2 = both) | |
120 | * | |
121 | */ | |
122 | static const struct { | |
123 | char cmdchar; | |
124 | u8 cmdbyte; | |
125 | u8 nr_args; | |
126 | u8 nr_ret; | |
127 | u8 dir:2; | |
128 | } blinkm_cmds[17] = { | |
129 | /* cmdchar, cmdbyte, nr_args, nr_ret, dir */ | |
130 | { 'n', 0x6e, 3, 0, 1}, | |
131 | { 'c', 0x63, 3, 0, 1}, | |
132 | { 'h', 0x68, 3, 0, 1}, | |
133 | { 'C', 0x43, 3, 0, 1}, | |
134 | { 'H', 0x48, 3, 0, 1}, | |
135 | { 'p', 0x70, 3, 0, 1}, | |
136 | { 'o', 0x6f, 0, 0, 1}, | |
137 | { 'f', 0x66, 1, 0, 1}, | |
138 | { 't', 0x74, 1, 0, 1}, | |
139 | { 'g', 0x67, 0, 3, 0}, | |
140 | { 'W', 0x57, 7, 0, 1}, | |
141 | { 'R', 0x52, 2, 5, 2}, | |
142 | { 'L', 0x4c, 3, 0, 1}, | |
143 | { 'A', 0x41, 4, 0, 1}, | |
144 | { 'a', 0x61, 0, 1, 0}, | |
145 | { 'Z', 0x5a, 0, 1, 0}, | |
146 | { 'B', 0x42, 5, 0, 1}, | |
147 | }; | |
148 | ||
149 | static ssize_t show_color_common(struct device *dev, char *buf, int color) | |
150 | { | |
151 | struct i2c_client *client; | |
152 | struct blinkm_data *data; | |
153 | int ret; | |
154 | ||
155 | client = to_i2c_client(dev); | |
156 | data = i2c_get_clientdata(client); | |
157 | ||
158 | ret = blinkm_transfer_hw(client, BLM_GET_CUR_RGB); | |
159 | if (ret < 0) | |
160 | return ret; | |
161 | switch (color) { | |
162 | case RED: | |
163 | return scnprintf(buf, PAGE_SIZE, "%02X\n", data->red); | |
b54cf35a JSM |
164 | case GREEN: |
165 | return scnprintf(buf, PAGE_SIZE, "%02X\n", data->green); | |
b54cf35a JSM |
166 | case BLUE: |
167 | return scnprintf(buf, PAGE_SIZE, "%02X\n", data->blue); | |
b54cf35a JSM |
168 | default: |
169 | return -EINVAL; | |
170 | } | |
171 | return -EINVAL; | |
172 | } | |
173 | ||
174 | static int store_color_common(struct device *dev, const char *buf, int color) | |
175 | { | |
176 | struct i2c_client *client; | |
177 | struct blinkm_data *data; | |
178 | int ret; | |
179 | u8 value; | |
180 | ||
181 | client = to_i2c_client(dev); | |
182 | data = i2c_get_clientdata(client); | |
183 | ||
184 | ret = kstrtou8(buf, 10, &value); | |
185 | if (ret < 0) { | |
186 | dev_err(dev, "BlinkM: value too large!\n"); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | switch (color) { | |
191 | case RED: | |
192 | data->next_red = value; | |
193 | break; | |
194 | case GREEN: | |
195 | data->next_green = value; | |
196 | break; | |
197 | case BLUE: | |
198 | data->next_blue = value; | |
199 | break; | |
200 | default: | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | dev_dbg(dev, "next_red = %d, next_green = %d, next_blue = %d\n", | |
205 | data->next_red, data->next_green, data->next_blue); | |
206 | ||
207 | /* if mode ... */ | |
208 | ret = blinkm_transfer_hw(client, BLM_GO_RGB); | |
209 | if (ret < 0) { | |
210 | dev_err(dev, "BlinkM: can't set RGB\n"); | |
211 | return ret; | |
212 | } | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static ssize_t show_red(struct device *dev, struct device_attribute *attr, | |
217 | char *buf) | |
218 | { | |
219 | return show_color_common(dev, buf, RED); | |
220 | } | |
221 | ||
222 | static ssize_t store_red(struct device *dev, struct device_attribute *attr, | |
223 | const char *buf, size_t count) | |
224 | { | |
225 | int ret; | |
226 | ||
227 | ret = store_color_common(dev, buf, RED); | |
228 | if (ret < 0) | |
229 | return ret; | |
230 | return count; | |
231 | } | |
232 | ||
233 | static DEVICE_ATTR(red, S_IRUGO | S_IWUSR, show_red, store_red); | |
234 | ||
235 | static ssize_t show_green(struct device *dev, struct device_attribute *attr, | |
236 | char *buf) | |
237 | { | |
238 | return show_color_common(dev, buf, GREEN); | |
239 | } | |
240 | ||
241 | static ssize_t store_green(struct device *dev, struct device_attribute *attr, | |
242 | const char *buf, size_t count) | |
243 | { | |
244 | ||
245 | int ret; | |
246 | ||
247 | ret = store_color_common(dev, buf, GREEN); | |
248 | if (ret < 0) | |
249 | return ret; | |
250 | return count; | |
251 | } | |
252 | ||
253 | static DEVICE_ATTR(green, S_IRUGO | S_IWUSR, show_green, store_green); | |
254 | ||
255 | static ssize_t show_blue(struct device *dev, struct device_attribute *attr, | |
256 | char *buf) | |
257 | { | |
258 | return show_color_common(dev, buf, BLUE); | |
259 | } | |
260 | ||
261 | static ssize_t store_blue(struct device *dev, struct device_attribute *attr, | |
262 | const char *buf, size_t count) | |
263 | { | |
264 | int ret; | |
265 | ||
266 | ret = store_color_common(dev, buf, BLUE); | |
267 | if (ret < 0) | |
268 | return ret; | |
269 | return count; | |
270 | } | |
271 | ||
272 | static DEVICE_ATTR(blue, S_IRUGO | S_IWUSR, show_blue, store_blue); | |
273 | ||
274 | static ssize_t show_test(struct device *dev, struct device_attribute *attr, | |
275 | char *buf) | |
276 | { | |
277 | return scnprintf(buf, PAGE_SIZE, | |
278 | "#Write into test to start test sequence!#\n"); | |
279 | } | |
280 | ||
281 | static ssize_t store_test(struct device *dev, struct device_attribute *attr, | |
282 | const char *buf, size_t count) | |
283 | { | |
284 | ||
285 | struct i2c_client *client; | |
286 | int ret; | |
287 | client = to_i2c_client(dev); | |
288 | ||
289 | /*test */ | |
290 | ret = blinkm_test_run(client); | |
291 | if (ret < 0) | |
292 | return ret; | |
293 | ||
294 | return count; | |
295 | } | |
296 | ||
297 | static DEVICE_ATTR(test, S_IRUGO | S_IWUSR, show_test, store_test); | |
298 | ||
299 | /* TODO: HSB, fade, timeadj, script ... */ | |
300 | ||
301 | static struct attribute *blinkm_attrs[] = { | |
302 | &dev_attr_red.attr, | |
303 | &dev_attr_green.attr, | |
304 | &dev_attr_blue.attr, | |
305 | &dev_attr_test.attr, | |
306 | NULL, | |
307 | }; | |
308 | ||
309 | static struct attribute_group blinkm_group = { | |
310 | .name = "blinkm", | |
311 | .attrs = blinkm_attrs, | |
312 | }; | |
313 | ||
314 | static int blinkm_write(struct i2c_client *client, int cmd, u8 *arg) | |
315 | { | |
316 | int result; | |
317 | int i; | |
318 | int arglen = blinkm_cmds[cmd].nr_args; | |
319 | /* write out cmd to blinkm - always / default step */ | |
320 | result = i2c_smbus_write_byte(client, blinkm_cmds[cmd].cmdbyte); | |
321 | if (result < 0) | |
322 | return result; | |
323 | /* no args to write out */ | |
324 | if (arglen == 0) | |
325 | return 0; | |
326 | ||
327 | for (i = 0; i < arglen; i++) { | |
328 | /* repeat for arglen */ | |
329 | result = i2c_smbus_write_byte(client, arg[i]); | |
330 | if (result < 0) | |
331 | return result; | |
332 | } | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static int blinkm_read(struct i2c_client *client, int cmd, u8 *arg) | |
337 | { | |
338 | int result; | |
339 | int i; | |
340 | int retlen = blinkm_cmds[cmd].nr_ret; | |
341 | for (i = 0; i < retlen; i++) { | |
342 | /* repeat for retlen */ | |
343 | result = i2c_smbus_read_byte(client); | |
344 | if (result < 0) | |
345 | return result; | |
346 | arg[i] = result; | |
347 | } | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | static int blinkm_transfer_hw(struct i2c_client *client, int cmd) | |
353 | { | |
354 | /* the protocol is simple but non-standard: | |
355 | * e.g. cmd 'g' (= 0x67) for "get device address" | |
356 | * - which defaults to 0x09 - would be the sequence: | |
357 | * a) write 0x67 to the device (byte write) | |
358 | * b) read the value (0x09) back right after (byte read) | |
359 | * | |
360 | * Watch out for "unfinished" sequences (i.e. not enough reads | |
361 | * or writes after a command. It will make the blinkM misbehave. | |
362 | * Sequence is key here. | |
363 | */ | |
364 | ||
365 | /* args / return are in private data struct */ | |
366 | struct blinkm_data *data = i2c_get_clientdata(client); | |
367 | ||
368 | /* We start hardware transfers which are not to be | |
369 | * mixed with other commands. Aquire a lock now. */ | |
370 | if (mutex_lock_interruptible(&data->update_lock) < 0) | |
371 | return -EAGAIN; | |
372 | ||
373 | /* switch cmd - usually write before reads */ | |
374 | switch (cmd) { | |
375 | case BLM_FADE_RAND_RGB: | |
376 | case BLM_GO_RGB: | |
377 | case BLM_FADE_RGB: | |
378 | data->args[0] = data->next_red; | |
379 | data->args[1] = data->next_green; | |
380 | data->args[2] = data->next_blue; | |
381 | blinkm_write(client, cmd, data->args); | |
382 | data->red = data->args[0]; | |
383 | data->green = data->args[1]; | |
384 | data->blue = data->args[2]; | |
385 | break; | |
386 | case BLM_FADE_HSB: | |
387 | case BLM_FADE_RAND_HSB: | |
388 | data->args[0] = data->next_hue; | |
389 | data->args[1] = data->next_saturation; | |
390 | data->args[2] = data->next_brightness; | |
391 | blinkm_write(client, cmd, data->args); | |
392 | data->hue = data->next_hue; | |
393 | data->saturation = data->next_saturation; | |
394 | data->brightness = data->next_brightness; | |
395 | break; | |
396 | case BLM_PLAY_SCRIPT: | |
397 | data->args[0] = data->script_id; | |
398 | data->args[1] = data->script_repeats; | |
399 | data->args[2] = data->script_startline; | |
400 | blinkm_write(client, cmd, data->args); | |
401 | break; | |
402 | case BLM_STOP_SCRIPT: | |
403 | blinkm_write(client, cmd, NULL); | |
404 | break; | |
405 | case BLM_GET_CUR_RGB: | |
406 | data->args[0] = data->red; | |
407 | data->args[1] = data->green; | |
408 | data->args[2] = data->blue; | |
409 | blinkm_write(client, cmd, NULL); | |
410 | blinkm_read(client, cmd, data->args); | |
411 | data->red = data->args[0]; | |
412 | data->green = data->args[1]; | |
413 | data->blue = data->args[2]; | |
414 | break; | |
415 | case BLM_GET_ADDR: | |
416 | data->args[0] = data->i2c_addr; | |
417 | blinkm_write(client, cmd, NULL); | |
418 | blinkm_read(client, cmd, data->args); | |
419 | data->i2c_addr = data->args[0]; | |
420 | break; | |
421 | case BLM_SET_TIME_ADJ: | |
422 | case BLM_SET_FADE_SPEED: | |
423 | case BLM_READ_SCRIPT_LINE: | |
424 | case BLM_WRITE_SCRIPT_LINE: | |
425 | case BLM_SET_SCRIPT_LR: | |
426 | case BLM_SET_ADDR: | |
427 | case BLM_GET_FW_VER: | |
428 | case BLM_SET_STARTUP_PARAM: | |
429 | dev_err(&client->dev, | |
430 | "BlinkM: cmd %d not implemented yet.\n", cmd); | |
431 | break; | |
432 | default: | |
433 | dev_err(&client->dev, "BlinkM: unknown command %d\n", cmd); | |
434 | mutex_unlock(&data->update_lock); | |
435 | return -EINVAL; | |
436 | } /* end switch(cmd) */ | |
437 | ||
438 | /* transfers done, unlock */ | |
439 | mutex_unlock(&data->update_lock); | |
440 | return 0; | |
441 | } | |
442 | ||
443 | static void led_work(struct work_struct *work) | |
444 | { | |
445 | int ret; | |
446 | struct blinkm_led *led; | |
447 | struct blinkm_data *data ; | |
448 | struct blinkm_work *blm_work = work_to_blmwork(work); | |
449 | ||
450 | led = blm_work->blinkm_led; | |
451 | data = i2c_get_clientdata(led->i2c_client); | |
452 | ret = blinkm_transfer_hw(led->i2c_client, BLM_GO_RGB); | |
453 | atomic_dec(&led->active); | |
454 | dev_dbg(&led->i2c_client->dev, | |
455 | "# DONE # next_red = %d, next_green = %d," | |
456 | " next_blue = %d, active = %d\n", | |
457 | data->next_red, data->next_green, | |
458 | data->next_blue, atomic_read(&led->active)); | |
459 | kfree(blm_work); | |
460 | } | |
461 | ||
462 | static int blinkm_led_common_set(struct led_classdev *led_cdev, | |
463 | enum led_brightness value, int color) | |
464 | { | |
465 | /* led_brightness is 0, 127 or 255 - we just use it here as-is */ | |
466 | struct blinkm_led *led = cdev_to_blmled(led_cdev); | |
467 | struct blinkm_data *data = i2c_get_clientdata(led->i2c_client); | |
4d8729a1 | 468 | struct blinkm_work *bl_work; |
b54cf35a JSM |
469 | |
470 | switch (color) { | |
471 | case RED: | |
472 | /* bail out if there's no change */ | |
473 | if (data->next_red == (u8) value) | |
474 | return 0; | |
475 | /* we assume a quite fast sequence here ([off]->on->off) | |
476 | * think of network led trigger - we cannot blink that fast, so | |
477 | * in case we already have a off->on->off transition queued up, | |
478 | * we refuse to queue up more. | |
479 | * Revisit: fast-changing brightness. */ | |
480 | if (atomic_read(&led->active) > 1) | |
481 | return 0; | |
482 | data->next_red = (u8) value; | |
483 | break; | |
484 | case GREEN: | |
485 | /* bail out if there's no change */ | |
486 | if (data->next_green == (u8) value) | |
487 | return 0; | |
488 | /* we assume a quite fast sequence here ([off]->on->off) | |
489 | * Revisit: fast-changing brightness. */ | |
490 | if (atomic_read(&led->active) > 1) | |
491 | return 0; | |
492 | data->next_green = (u8) value; | |
493 | break; | |
494 | case BLUE: | |
495 | /* bail out if there's no change */ | |
496 | if (data->next_blue == (u8) value) | |
497 | return 0; | |
498 | /* we assume a quite fast sequence here ([off]->on->off) | |
499 | * Revisit: fast-changing brightness. */ | |
500 | if (atomic_read(&led->active) > 1) | |
501 | return 0; | |
502 | data->next_blue = (u8) value; | |
503 | break; | |
504 | ||
505 | default: | |
506 | dev_err(&led->i2c_client->dev, "BlinkM: unknown color.\n"); | |
507 | return -EINVAL; | |
508 | } | |
509 | ||
4d8729a1 DC |
510 | bl_work = kzalloc(sizeof(*bl_work), GFP_ATOMIC); |
511 | if (!bl_work) | |
512 | return -ENOMEM; | |
513 | ||
b54cf35a JSM |
514 | atomic_inc(&led->active); |
515 | dev_dbg(&led->i2c_client->dev, | |
516 | "#TO_SCHED# next_red = %d, next_green = %d," | |
517 | " next_blue = %d, active = %d\n", | |
518 | data->next_red, data->next_green, | |
519 | data->next_blue, atomic_read(&led->active)); | |
520 | ||
521 | /* a fresh work _item_ for each change */ | |
522 | bl_work->blinkm_led = led; | |
523 | INIT_WORK(&bl_work->work, led_work); | |
524 | /* queue work in own queue for easy sync on exit*/ | |
525 | schedule_work(&bl_work->work); | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static void blinkm_led_red_set(struct led_classdev *led_cdev, | |
531 | enum led_brightness value) | |
532 | { | |
533 | blinkm_led_common_set(led_cdev, value, RED); | |
534 | } | |
535 | ||
536 | static void blinkm_led_green_set(struct led_classdev *led_cdev, | |
537 | enum led_brightness value) | |
538 | { | |
539 | blinkm_led_common_set(led_cdev, value, GREEN); | |
540 | } | |
541 | ||
542 | static void blinkm_led_blue_set(struct led_classdev *led_cdev, | |
543 | enum led_brightness value) | |
544 | { | |
545 | blinkm_led_common_set(led_cdev, value, BLUE); | |
546 | } | |
547 | ||
548 | static void blinkm_init_hw(struct i2c_client *client) | |
549 | { | |
550 | int ret; | |
551 | ret = blinkm_transfer_hw(client, BLM_STOP_SCRIPT); | |
552 | ret = blinkm_transfer_hw(client, BLM_GO_RGB); | |
553 | } | |
554 | ||
555 | static int blinkm_test_run(struct i2c_client *client) | |
556 | { | |
557 | int ret; | |
558 | struct blinkm_data *data = i2c_get_clientdata(client); | |
559 | ||
560 | data->next_red = 0x01; | |
561 | data->next_green = 0x05; | |
562 | data->next_blue = 0x10; | |
563 | ret = blinkm_transfer_hw(client, BLM_GO_RGB); | |
564 | if (ret < 0) | |
565 | return ret; | |
566 | msleep(2000); | |
567 | ||
568 | data->next_red = 0x25; | |
569 | data->next_green = 0x10; | |
570 | data->next_blue = 0x31; | |
571 | ret = blinkm_transfer_hw(client, BLM_FADE_RGB); | |
572 | if (ret < 0) | |
573 | return ret; | |
574 | msleep(2000); | |
575 | ||
576 | data->next_hue = 0x50; | |
577 | data->next_saturation = 0x10; | |
578 | data->next_brightness = 0x20; | |
579 | ret = blinkm_transfer_hw(client, BLM_FADE_HSB); | |
580 | if (ret < 0) | |
581 | return ret; | |
582 | msleep(2000); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
588 | static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info) | |
589 | { | |
590 | struct i2c_adapter *adapter = client->adapter; | |
591 | int ret; | |
592 | int count = 99; | |
593 | u8 tmpargs[7]; | |
594 | ||
595 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
596 | | I2C_FUNC_SMBUS_WORD_DATA | |
597 | | I2C_FUNC_SMBUS_WRITE_BYTE)) | |
598 | return -ENODEV; | |
599 | ||
600 | /* Now, we do the remaining detection. Simple for now. */ | |
601 | /* We might need more guards to protect other i2c slaves */ | |
602 | ||
603 | /* make sure the blinkM is balanced (read/writes) */ | |
604 | while (count > 0) { | |
605 | ret = blinkm_write(client, BLM_GET_ADDR, NULL); | |
606 | usleep_range(5000, 10000); | |
607 | ret = blinkm_read(client, BLM_GET_ADDR, tmpargs); | |
608 | usleep_range(5000, 10000); | |
609 | if (tmpargs[0] == 0x09) | |
610 | count = 0; | |
611 | count--; | |
612 | } | |
613 | ||
614 | /* Step 1: Read BlinkM address back - cmd_char 'a' */ | |
615 | ret = blinkm_write(client, BLM_GET_ADDR, NULL); | |
616 | if (ret < 0) | |
18d4a06f | 617 | return ret; |
b54cf35a JSM |
618 | usleep_range(20000, 30000); /* allow a small delay */ |
619 | ret = blinkm_read(client, BLM_GET_ADDR, tmpargs); | |
620 | if (ret < 0) | |
18d4a06f | 621 | return ret; |
b54cf35a JSM |
622 | |
623 | if (tmpargs[0] != 0x09) { | |
624 | dev_err(&client->dev, "enodev DEV ADDR = 0x%02X\n", tmpargs[0]); | |
625 | return -ENODEV; | |
626 | } | |
627 | ||
628 | strlcpy(info->type, "blinkm", I2C_NAME_SIZE); | |
629 | return 0; | |
630 | } | |
631 | ||
98ea1ea2 | 632 | static int blinkm_probe(struct i2c_client *client, |
b54cf35a JSM |
633 | const struct i2c_device_id *id) |
634 | { | |
635 | struct blinkm_data *data; | |
636 | struct blinkm_led *led[3]; | |
637 | int err, i; | |
638 | char blinkm_led_name[28]; | |
639 | ||
640 | data = devm_kzalloc(&client->dev, | |
641 | sizeof(struct blinkm_data), GFP_KERNEL); | |
642 | if (!data) { | |
643 | err = -ENOMEM; | |
644 | goto exit; | |
645 | } | |
646 | ||
647 | data->i2c_addr = 0x09; | |
648 | data->i2c_addr = 0x08; | |
649 | /* i2c addr - use fake addr of 0x08 initially (real is 0x09) */ | |
650 | data->fw_ver = 0xfe; | |
651 | /* firmware version - use fake until we read real value | |
652 | * (currently broken - BlinkM confused!) */ | |
653 | data->script_id = 0x01; | |
654 | data->i2c_client = client; | |
655 | ||
656 | i2c_set_clientdata(client, data); | |
657 | mutex_init(&data->update_lock); | |
658 | ||
659 | /* Register sysfs hooks */ | |
660 | err = sysfs_create_group(&client->dev.kobj, &blinkm_group); | |
661 | if (err < 0) { | |
662 | dev_err(&client->dev, "couldn't register sysfs group\n"); | |
663 | goto exit; | |
664 | } | |
665 | ||
666 | for (i = 0; i < 3; i++) { | |
667 | /* RED = 0, GREEN = 1, BLUE = 2 */ | |
668 | led[i] = &data->blinkm_leds[i]; | |
669 | led[i]->i2c_client = client; | |
670 | led[i]->id = i; | |
671 | led[i]->led_cdev.max_brightness = 255; | |
672 | led[i]->led_cdev.flags = LED_CORE_SUSPENDRESUME; | |
673 | atomic_set(&led[i]->active, 0); | |
674 | switch (i) { | |
675 | case RED: | |
676 | snprintf(blinkm_led_name, sizeof(blinkm_led_name), | |
677 | "blinkm-%d-%d-red", | |
678 | client->adapter->nr, | |
679 | client->addr); | |
680 | led[i]->led_cdev.name = blinkm_led_name; | |
681 | led[i]->led_cdev.brightness_set = blinkm_led_red_set; | |
682 | err = led_classdev_register(&client->dev, | |
683 | &led[i]->led_cdev); | |
684 | if (err < 0) { | |
685 | dev_err(&client->dev, | |
686 | "couldn't register LED %s\n", | |
687 | led[i]->led_cdev.name); | |
688 | goto failred; | |
689 | } | |
690 | break; | |
691 | case GREEN: | |
692 | snprintf(blinkm_led_name, sizeof(blinkm_led_name), | |
693 | "blinkm-%d-%d-green", | |
694 | client->adapter->nr, | |
695 | client->addr); | |
696 | led[i]->led_cdev.name = blinkm_led_name; | |
697 | led[i]->led_cdev.brightness_set = blinkm_led_green_set; | |
698 | err = led_classdev_register(&client->dev, | |
699 | &led[i]->led_cdev); | |
700 | if (err < 0) { | |
701 | dev_err(&client->dev, | |
702 | "couldn't register LED %s\n", | |
703 | led[i]->led_cdev.name); | |
704 | goto failgreen; | |
705 | } | |
706 | break; | |
707 | case BLUE: | |
708 | snprintf(blinkm_led_name, sizeof(blinkm_led_name), | |
709 | "blinkm-%d-%d-blue", | |
710 | client->adapter->nr, | |
711 | client->addr); | |
712 | led[i]->led_cdev.name = blinkm_led_name; | |
713 | led[i]->led_cdev.brightness_set = blinkm_led_blue_set; | |
714 | err = led_classdev_register(&client->dev, | |
715 | &led[i]->led_cdev); | |
716 | if (err < 0) { | |
717 | dev_err(&client->dev, | |
718 | "couldn't register LED %s\n", | |
719 | led[i]->led_cdev.name); | |
720 | goto failblue; | |
721 | } | |
722 | break; | |
723 | } /* end switch */ | |
724 | } /* end for */ | |
725 | ||
726 | /* Initialize the blinkm */ | |
727 | blinkm_init_hw(client); | |
728 | ||
729 | return 0; | |
730 | ||
731 | failblue: | |
732 | led_classdev_unregister(&led[GREEN]->led_cdev); | |
733 | ||
734 | failgreen: | |
735 | led_classdev_unregister(&led[RED]->led_cdev); | |
736 | ||
737 | failred: | |
738 | sysfs_remove_group(&client->dev.kobj, &blinkm_group); | |
739 | exit: | |
740 | return err; | |
741 | } | |
742 | ||
678e8a6b | 743 | static int blinkm_remove(struct i2c_client *client) |
b54cf35a JSM |
744 | { |
745 | struct blinkm_data *data = i2c_get_clientdata(client); | |
746 | int ret = 0; | |
747 | int i; | |
748 | ||
749 | /* make sure no workqueue entries are pending */ | |
750 | for (i = 0; i < 3; i++) { | |
751 | flush_scheduled_work(); | |
752 | led_classdev_unregister(&data->blinkm_leds[i].led_cdev); | |
753 | } | |
754 | ||
755 | /* reset rgb */ | |
756 | data->next_red = 0x00; | |
757 | data->next_green = 0x00; | |
758 | data->next_blue = 0x00; | |
759 | ret = blinkm_transfer_hw(client, BLM_FADE_RGB); | |
760 | if (ret < 0) | |
761 | dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); | |
762 | ||
763 | /* reset hsb */ | |
764 | data->next_hue = 0x00; | |
765 | data->next_saturation = 0x00; | |
766 | data->next_brightness = 0x00; | |
767 | ret = blinkm_transfer_hw(client, BLM_FADE_HSB); | |
768 | if (ret < 0) | |
769 | dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); | |
770 | ||
771 | /* red fade to off */ | |
772 | data->next_red = 0xff; | |
773 | ret = blinkm_transfer_hw(client, BLM_GO_RGB); | |
774 | if (ret < 0) | |
775 | dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); | |
776 | ||
777 | /* off */ | |
778 | data->next_red = 0x00; | |
779 | ret = blinkm_transfer_hw(client, BLM_FADE_RGB); | |
780 | if (ret < 0) | |
781 | dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n"); | |
782 | ||
783 | sysfs_remove_group(&client->dev.kobj, &blinkm_group); | |
784 | return 0; | |
785 | } | |
786 | ||
787 | static const struct i2c_device_id blinkm_id[] = { | |
788 | {"blinkm", 0}, | |
789 | {} | |
790 | }; | |
791 | ||
792 | MODULE_DEVICE_TABLE(i2c, blinkm_id); | |
793 | ||
794 | /* This is the driver that will be inserted */ | |
795 | static struct i2c_driver blinkm_driver = { | |
796 | .class = I2C_CLASS_HWMON, | |
797 | .driver = { | |
798 | .name = "blinkm", | |
799 | }, | |
800 | .probe = blinkm_probe, | |
df07cf81 | 801 | .remove = blinkm_remove, |
b54cf35a JSM |
802 | .id_table = blinkm_id, |
803 | .detect = blinkm_detect, | |
804 | .address_list = normal_i2c, | |
805 | }; | |
806 | ||
807 | module_i2c_driver(blinkm_driver); | |
808 | ||
809 | MODULE_AUTHOR("Jan-Simon Moeller <dl9pf@gmx.de>"); | |
810 | MODULE_DESCRIPTION("BlinkM RGB LED driver"); | |
811 | MODULE_LICENSE("GPL"); | |
812 |