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