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ktest: Test if target machine is up before install
[linux-2.6.git] / drivers / leds / leds-blinkm.c
blobf7c3d7f1ec527fcb3950a3dbd8da26efc48ca00a
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);
164 break;
165 case GREEN:
166 return scnprintf(buf, PAGE_SIZE, "%02X\n", data->green);
167 break;
168 case BLUE:
169 return scnprintf(buf, PAGE_SIZE, "%02X\n", data->blue);
170 break;
171 default:
172 return -EINVAL;
173 }
174 return -EINVAL;
175 }
176
177 static int store_color_common(struct device *dev, const char *buf, int color)
178 {
179 struct i2c_client *client;
180 struct blinkm_data *data;
181 int ret;
182 u8 value;
183
184 client = to_i2c_client(dev);
185 data = i2c_get_clientdata(client);
186
187 ret = kstrtou8(buf, 10, &value);
188 if (ret < 0) {
189 dev_err(dev, "BlinkM: value too large!\n");
190 return ret;
191 }
192
193 switch (color) {
194 case RED:
195 data->next_red = value;
196 break;
197 case GREEN:
198 data->next_green = value;
199 break;
200 case BLUE:
201 data->next_blue = value;
202 break;
203 default:
204 return -EINVAL;
205 }
206
207 dev_dbg(dev, "next_red = %d, next_green = %d, next_blue = %d\n",
208 data->next_red, data->next_green, data->next_blue);
209
210 /* if mode ... */
211 ret = blinkm_transfer_hw(client, BLM_GO_RGB);
212 if (ret < 0) {
213 dev_err(dev, "BlinkM: can't set RGB\n");
214 return ret;
215 }
216 return 0;
217 }
218
219 static ssize_t show_red(struct device *dev, struct device_attribute *attr,
220 char *buf)
221 {
222 return show_color_common(dev, buf, RED);
223 }
224
225 static ssize_t store_red(struct device *dev, struct device_attribute *attr,
226 const char *buf, size_t count)
227 {
228 int ret;
229
230 ret = store_color_common(dev, buf, RED);
231 if (ret < 0)
232 return ret;
233 return count;
234 }
235
236 static DEVICE_ATTR(red, S_IRUGO | S_IWUSR, show_red, store_red);
237
238 static ssize_t show_green(struct device *dev, struct device_attribute *attr,
239 char *buf)
240 {
241 return show_color_common(dev, buf, GREEN);
242 }
243
244 static ssize_t store_green(struct device *dev, struct device_attribute *attr,
245 const char *buf, size_t count)
246 {
247
248 int ret;
249
250 ret = store_color_common(dev, buf, GREEN);
251 if (ret < 0)
252 return ret;
253 return count;
254 }
255
256 static DEVICE_ATTR(green, S_IRUGO | S_IWUSR, show_green, store_green);
257
258 static ssize_t show_blue(struct device *dev, struct device_attribute *attr,
259 char *buf)
260 {
261 return show_color_common(dev, buf, BLUE);
262 }
263
264 static ssize_t store_blue(struct device *dev, struct device_attribute *attr,
265 const char *buf, size_t count)
266 {
267 int ret;
268
269 ret = store_color_common(dev, buf, BLUE);
270 if (ret < 0)
271 return ret;
272 return count;
273 }
274
275 static DEVICE_ATTR(blue, S_IRUGO | S_IWUSR, show_blue, store_blue);
276
277 static ssize_t show_test(struct device *dev, struct device_attribute *attr,
278 char *buf)
279 {
280 return scnprintf(buf, PAGE_SIZE,
281 "#Write into test to start test sequence!#\n");
282 }
283
284 static ssize_t store_test(struct device *dev, struct device_attribute *attr,
285 const char *buf, size_t count)
286 {
287
288 struct i2c_client *client;
289 int ret;
290 client = to_i2c_client(dev);
291
292 /*test */
293 ret = blinkm_test_run(client);
294 if (ret < 0)
295 return ret;
296
297 return count;
298 }
299
300 static DEVICE_ATTR(test, S_IRUGO | S_IWUSR, show_test, store_test);
301
302 /* TODO: HSB, fade, timeadj, script ... */
303
304 static struct attribute *blinkm_attrs[] = {
305 &dev_attr_red.attr,
306 &dev_attr_green.attr,
307 &dev_attr_blue.attr,
308 &dev_attr_test.attr,
309 NULL,
310 };
311
312 static struct attribute_group blinkm_group = {
313 .name = "blinkm",
314 .attrs = blinkm_attrs,
315 };
316
317 static int blinkm_write(struct i2c_client *client, int cmd, u8 *arg)
318 {
319 int result;
320 int i;
321 int arglen = blinkm_cmds[cmd].nr_args;
322 /* write out cmd to blinkm - always / default step */
323 result = i2c_smbus_write_byte(client, blinkm_cmds[cmd].cmdbyte);
324 if (result < 0)
325 return result;
326 /* no args to write out */
327 if (arglen == 0)
328 return 0;
329
330 for (i = 0; i < arglen; i++) {
331 /* repeat for arglen */
332 result = i2c_smbus_write_byte(client, arg[i]);
333 if (result < 0)
334 return result;
335 }
336 return 0;
337 }
338
339 static int blinkm_read(struct i2c_client *client, int cmd, u8 *arg)
340 {
341 int result;
342 int i;
343 int retlen = blinkm_cmds[cmd].nr_ret;
344 for (i = 0; i < retlen; i++) {
345 /* repeat for retlen */
346 result = i2c_smbus_read_byte(client);
347 if (result < 0)
348 return result;
349 arg[i] = result;
350 }
351
352 return 0;
353 }
354
355 static int blinkm_transfer_hw(struct i2c_client *client, int cmd)
356 {
357 /* the protocol is simple but non-standard:
358 * e.g. cmd 'g' (= 0x67) for "get device address"
359 * - which defaults to 0x09 - would be the sequence:
360 * a) write 0x67 to the device (byte write)
361 * b) read the value (0x09) back right after (byte read)
362 *
363 * Watch out for "unfinished" sequences (i.e. not enough reads
364 * or writes after a command. It will make the blinkM misbehave.
365 * Sequence is key here.
366 */
367
368 /* args / return are in private data struct */
369 struct blinkm_data *data = i2c_get_clientdata(client);
370
371 /* We start hardware transfers which are not to be
372 * mixed with other commands. Aquire a lock now. */
373 if (mutex_lock_interruptible(&data->update_lock) < 0)
374 return -EAGAIN;
375
376 /* switch cmd - usually write before reads */
377 switch (cmd) {
378 case BLM_FADE_RAND_RGB:
379 case BLM_GO_RGB:
380 case BLM_FADE_RGB:
381 data->args[0] = data->next_red;
382 data->args[1] = data->next_green;
383 data->args[2] = data->next_blue;
384 blinkm_write(client, cmd, data->args);
385 data->red = data->args[0];
386 data->green = data->args[1];
387 data->blue = data->args[2];
388 break;
389 case BLM_FADE_HSB:
390 case BLM_FADE_RAND_HSB:
391 data->args[0] = data->next_hue;
392 data->args[1] = data->next_saturation;
393 data->args[2] = data->next_brightness;
394 blinkm_write(client, cmd, data->args);
395 data->hue = data->next_hue;
396 data->saturation = data->next_saturation;
397 data->brightness = data->next_brightness;
398 break;
399 case BLM_PLAY_SCRIPT:
400 data->args[0] = data->script_id;
401 data->args[1] = data->script_repeats;
402 data->args[2] = data->script_startline;
403 blinkm_write(client, cmd, data->args);
404 break;
405 case BLM_STOP_SCRIPT:
406 blinkm_write(client, cmd, NULL);
407 break;
408 case BLM_GET_CUR_RGB:
409 data->args[0] = data->red;
410 data->args[1] = data->green;
411 data->args[2] = data->blue;
412 blinkm_write(client, cmd, NULL);
413 blinkm_read(client, cmd, data->args);
414 data->red = data->args[0];
415 data->green = data->args[1];
416 data->blue = data->args[2];
417 break;
418 case BLM_GET_ADDR:
419 data->args[0] = data->i2c_addr;
420 blinkm_write(client, cmd, NULL);
421 blinkm_read(client, cmd, data->args);
422 data->i2c_addr = data->args[0];
423 break;
424 case BLM_SET_TIME_ADJ:
425 case BLM_SET_FADE_SPEED:
426 case BLM_READ_SCRIPT_LINE:
427 case BLM_WRITE_SCRIPT_LINE:
428 case BLM_SET_SCRIPT_LR:
429 case BLM_SET_ADDR:
430 case BLM_GET_FW_VER:
431 case BLM_SET_STARTUP_PARAM:
432 dev_err(&client->dev,
433 "BlinkM: cmd %d not implemented yet.\n", cmd);
434 break;
435 default:
436 dev_err(&client->dev, "BlinkM: unknown command %d\n", cmd);
437 mutex_unlock(&data->update_lock);
438 return -EINVAL;
439 } /* end switch(cmd) */
440
441 /* transfers done, unlock */
442 mutex_unlock(&data->update_lock);
443 return 0;
444 }
445
446 static void led_work(struct work_struct *work)
447 {
448 int ret;
449 struct blinkm_led *led;
450 struct blinkm_data *data ;
451 struct blinkm_work *blm_work = work_to_blmwork(work);
452
453 led = blm_work->blinkm_led;
454 data = i2c_get_clientdata(led->i2c_client);
455 ret = blinkm_transfer_hw(led->i2c_client, BLM_GO_RGB);
456 atomic_dec(&led->active);
457 dev_dbg(&led->i2c_client->dev,
458 "# DONE # next_red = %d, next_green = %d,"
459 " next_blue = %d, active = %d\n",
460 data->next_red, data->next_green,
461 data->next_blue, atomic_read(&led->active));
462 kfree(blm_work);
463 }
464
465 static int blinkm_led_common_set(struct led_classdev *led_cdev,
466 enum led_brightness value, int color)
467 {
468 /* led_brightness is 0, 127 or 255 - we just use it here as-is */
469 struct blinkm_led *led = cdev_to_blmled(led_cdev);
470 struct blinkm_data *data = i2c_get_clientdata(led->i2c_client);
471 struct blinkm_work *bl_work;
472
473 switch (color) {
474 case RED:
475 /* bail out if there's no change */
476 if (data->next_red == (u8) value)
477 return 0;
478 /* we assume a quite fast sequence here ([off]->on->off)
479 * think of network led trigger - we cannot blink that fast, so
480 * in case we already have a off->on->off transition queued up,
481 * we refuse to queue up more.
482 * Revisit: fast-changing brightness. */
483 if (atomic_read(&led->active) > 1)
484 return 0;
485 data->next_red = (u8) value;
486 break;
487 case GREEN:
488 /* bail out if there's no change */
489 if (data->next_green == (u8) value)
490 return 0;
491 /* we assume a quite fast sequence here ([off]->on->off)
492 * Revisit: fast-changing brightness. */
493 if (atomic_read(&led->active) > 1)
494 return 0;
495 data->next_green = (u8) value;
496 break;
497 case BLUE:
498 /* bail out if there's no change */
499 if (data->next_blue == (u8) value)
500 return 0;
501 /* we assume a quite fast sequence here ([off]->on->off)
502 * Revisit: fast-changing brightness. */
503 if (atomic_read(&led->active) > 1)
504 return 0;
505 data->next_blue = (u8) value;
506 break;
507
508 default:
509 dev_err(&led->i2c_client->dev, "BlinkM: unknown color.\n");
510 return -EINVAL;
511 }
512
513 bl_work = kzalloc(sizeof(*bl_work), GFP_ATOMIC);
514 if (!bl_work)
515 return -ENOMEM;
516
517 atomic_inc(&led->active);
518 dev_dbg(&led->i2c_client->dev,
519 "#TO_SCHED# next_red = %d, next_green = %d,"
520 " next_blue = %d, active = %d\n",
521 data->next_red, data->next_green,
522 data->next_blue, atomic_read(&led->active));
523
524 /* a fresh work _item_ for each change */
525 bl_work->blinkm_led = led;
526 INIT_WORK(&bl_work->work, led_work);
527 /* queue work in own queue for easy sync on exit*/
528 schedule_work(&bl_work->work);
529
530 return 0;
531 }
532
533 static void blinkm_led_red_set(struct led_classdev *led_cdev,
534 enum led_brightness value)
535 {
536 blinkm_led_common_set(led_cdev, value, RED);
537 }
538
539 static void blinkm_led_green_set(struct led_classdev *led_cdev,
540 enum led_brightness value)
541 {
542 blinkm_led_common_set(led_cdev, value, GREEN);
543 }
544
545 static void blinkm_led_blue_set(struct led_classdev *led_cdev,
546 enum led_brightness value)
547 {
548 blinkm_led_common_set(led_cdev, value, BLUE);
549 }
550
551 static void blinkm_init_hw(struct i2c_client *client)
552 {
553 int ret;
554 ret = blinkm_transfer_hw(client, BLM_STOP_SCRIPT);
555 ret = blinkm_transfer_hw(client, BLM_GO_RGB);
556 }
557
558 static int blinkm_test_run(struct i2c_client *client)
559 {
560 int ret;
561 struct blinkm_data *data = i2c_get_clientdata(client);
562
563 data->next_red = 0x01;
564 data->next_green = 0x05;
565 data->next_blue = 0x10;
566 ret = blinkm_transfer_hw(client, BLM_GO_RGB);
567 if (ret < 0)
568 return ret;
569 msleep(2000);
570
571 data->next_red = 0x25;
572 data->next_green = 0x10;
573 data->next_blue = 0x31;
574 ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
575 if (ret < 0)
576 return ret;
577 msleep(2000);
578
579 data->next_hue = 0x50;
580 data->next_saturation = 0x10;
581 data->next_brightness = 0x20;
582 ret = blinkm_transfer_hw(client, BLM_FADE_HSB);
583 if (ret < 0)
584 return ret;
585 msleep(2000);
586
587 return 0;
588 }
589
590 /* Return 0 if detection is successful, -ENODEV otherwise */
591 static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info)
592 {
593 struct i2c_adapter *adapter = client->adapter;
594 int ret;
595 int count = 99;
596 u8 tmpargs[7];
597
598 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
599 | I2C_FUNC_SMBUS_WORD_DATA
600 | I2C_FUNC_SMBUS_WRITE_BYTE))
601 return -ENODEV;
602
603 /* Now, we do the remaining detection. Simple for now. */
604 /* We might need more guards to protect other i2c slaves */
605
606 /* make sure the blinkM is balanced (read/writes) */
607 while (count > 0) {
608 ret = blinkm_write(client, BLM_GET_ADDR, NULL);
609 usleep_range(5000, 10000);
610 ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
611 usleep_range(5000, 10000);
612 if (tmpargs[0] == 0x09)
613 count = 0;
614 count--;
615 }
616
617 /* Step 1: Read BlinkM address back - cmd_char 'a' */
618 ret = blinkm_write(client, BLM_GET_ADDR, NULL);
619 if (ret < 0)
620 return ret;
621 usleep_range(20000, 30000); /* allow a small delay */
622 ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
623 if (ret < 0)
624 return ret;
625
626 if (tmpargs[0] != 0x09) {
627 dev_err(&client->dev, "enodev DEV ADDR = 0x%02X\n", tmpargs[0]);
628 return -ENODEV;
629 }
630
631 strlcpy(info->type, "blinkm", I2C_NAME_SIZE);
632 return 0;
633 }
634
635 static int __devinit blinkm_probe(struct i2c_client *client,
636 const struct i2c_device_id *id)
637 {
638 struct blinkm_data *data;
639 struct blinkm_led *led[3];
640 int err, i;
641 char blinkm_led_name[28];
642
643 data = devm_kzalloc(&client->dev,
644 sizeof(struct blinkm_data), GFP_KERNEL);
645 if (!data) {
646 err = -ENOMEM;
647 goto exit;
648 }
649
650 data->i2c_addr = 0x09;
651 data->i2c_addr = 0x08;
652 /* i2c addr - use fake addr of 0x08 initially (real is 0x09) */
653 data->fw_ver = 0xfe;
654 /* firmware version - use fake until we read real value
655 * (currently broken - BlinkM confused!) */
656 data->script_id = 0x01;
657 data->i2c_client = client;
658
659 i2c_set_clientdata(client, data);
660 mutex_init(&data->update_lock);
661
662 /* Register sysfs hooks */
663 err = sysfs_create_group(&client->dev.kobj, &blinkm_group);
664 if (err < 0) {
665 dev_err(&client->dev, "couldn't register sysfs group\n");
666 goto exit;
667 }
668
669 for (i = 0; i < 3; i++) {
670 /* RED = 0, GREEN = 1, BLUE = 2 */
671 led[i] = &data->blinkm_leds[i];
672 led[i]->i2c_client = client;
673 led[i]->id = i;
674 led[i]->led_cdev.max_brightness = 255;
675 led[i]->led_cdev.flags = LED_CORE_SUSPENDRESUME;
676 atomic_set(&led[i]->active, 0);
677 switch (i) {
678 case RED:
679 snprintf(blinkm_led_name, sizeof(blinkm_led_name),
680 "blinkm-%d-%d-red",
681 client->adapter->nr,
682 client->addr);
683 led[i]->led_cdev.name = blinkm_led_name;
684 led[i]->led_cdev.brightness_set = blinkm_led_red_set;
685 err = led_classdev_register(&client->dev,
686 &led[i]->led_cdev);
687 if (err < 0) {
688 dev_err(&client->dev,
689 "couldn't register LED %s\n",
690 led[i]->led_cdev.name);
691 goto failred;
692 }
693 break;
694 case GREEN:
695 snprintf(blinkm_led_name, sizeof(blinkm_led_name),
696 "blinkm-%d-%d-green",
697 client->adapter->nr,
698 client->addr);
699 led[i]->led_cdev.name = blinkm_led_name;
700 led[i]->led_cdev.brightness_set = blinkm_led_green_set;
701 err = led_classdev_register(&client->dev,
702 &led[i]->led_cdev);
703 if (err < 0) {
704 dev_err(&client->dev,
705 "couldn't register LED %s\n",
706 led[i]->led_cdev.name);
707 goto failgreen;
708 }
709 break;
710 case BLUE:
711 snprintf(blinkm_led_name, sizeof(blinkm_led_name),
712 "blinkm-%d-%d-blue",
713 client->adapter->nr,
714 client->addr);
715 led[i]->led_cdev.name = blinkm_led_name;
716 led[i]->led_cdev.brightness_set = blinkm_led_blue_set;
717 err = led_classdev_register(&client->dev,
718 &led[i]->led_cdev);
719 if (err < 0) {
720 dev_err(&client->dev,
721 "couldn't register LED %s\n",
722 led[i]->led_cdev.name);
723 goto failblue;
724 }
725 break;
726 } /* end switch */
727 } /* end for */
728
729 /* Initialize the blinkm */
730 blinkm_init_hw(client);
731
732 return 0;
733
734 failblue:
735 led_classdev_unregister(&led[GREEN]->led_cdev);
736
737 failgreen:
738 led_classdev_unregister(&led[RED]->led_cdev);
739
740 failred:
741 sysfs_remove_group(&client->dev.kobj, &blinkm_group);
742 exit:
743 return err;
744 }
745
746 static int __devexit blinkm_remove(struct i2c_client *client)
747 {
748 struct blinkm_data *data = i2c_get_clientdata(client);
749 int ret = 0;
750 int i;
751
752 /* make sure no workqueue entries are pending */
753 for (i = 0; i < 3; i++) {
754 flush_scheduled_work();
755 led_classdev_unregister(&data->blinkm_leds[i].led_cdev);
756 }
757
758 /* reset rgb */
759 data->next_red = 0x00;
760 data->next_green = 0x00;
761 data->next_blue = 0x00;
762 ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
763 if (ret < 0)
764 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
765
766 /* reset hsb */
767 data->next_hue = 0x00;
768 data->next_saturation = 0x00;
769 data->next_brightness = 0x00;
770 ret = blinkm_transfer_hw(client, BLM_FADE_HSB);
771 if (ret < 0)
772 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
773
774 /* red fade to off */
775 data->next_red = 0xff;
776 ret = blinkm_transfer_hw(client, BLM_GO_RGB);
777 if (ret < 0)
778 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
779
780 /* off */
781 data->next_red = 0x00;
782 ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
783 if (ret < 0)
784 dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
785
786 sysfs_remove_group(&client->dev.kobj, &blinkm_group);
787 return 0;
788 }
789
790 static const struct i2c_device_id blinkm_id[] = {
791 {"blinkm", 0},
792 {}
793 };
794
795 MODULE_DEVICE_TABLE(i2c, blinkm_id);
796
797 /* This is the driver that will be inserted */
798 static struct i2c_driver blinkm_driver = {
799 .class = I2C_CLASS_HWMON,
800 .driver = {
801 .name = "blinkm",
802 },
803 .probe = blinkm_probe,
804 .remove = __devexit_p(blinkm_remove),
805 .id_table = blinkm_id,
806 .detect = blinkm_detect,
807 .address_list = normal_i2c,
808 };
809
810 module_i2c_driver(blinkm_driver);
811
812 MODULE_AUTHOR("Jan-Simon Moeller <dl9pf@gmx.de>");
813 MODULE_DESCRIPTION("BlinkM RGB LED driver");
814 MODULE_LICENSE("GPL");
815
Linus' kernel tree