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Merge branch 'stanton-cs1-driver' of git://git.alsa-project.org/alsa-kprivate into...
[karo-tx-linux.git] / drivers / leds / leds-lp5523.c
1 /*
2  * lp5523.c - LP5523 LED Driver
3  *
4  * Copyright (C) 2010 Nokia Corporation
5  *
6  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/i2c.h>
26 #include <linux/mutex.h>
27 #include <linux/gpio.h>
28 #include <linux/interrupt.h>
29 #include <linux/delay.h>
30 #include <linux/ctype.h>
31 #include <linux/spinlock.h>
32 #include <linux/wait.h>
33 #include <linux/leds.h>
34 #include <linux/leds-lp5523.h>
35 #include <linux/workqueue.h>
36 #include <linux/slab.h>
37
38 #define LP5523_REG_ENABLE               0x00
39 #define LP5523_REG_OP_MODE              0x01
40 #define LP5523_REG_RATIOMETRIC_MSB      0x02
41 #define LP5523_REG_RATIOMETRIC_LSB      0x03
42 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
43 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
44 #define LP5523_REG_LED_CNTRL_BASE       0x06
45 #define LP5523_REG_LED_PWM_BASE         0x16
46 #define LP5523_REG_LED_CURRENT_BASE     0x26
47 #define LP5523_REG_CONFIG               0x36
48 #define LP5523_REG_CHANNEL1_PC          0x37
49 #define LP5523_REG_CHANNEL2_PC          0x38
50 #define LP5523_REG_CHANNEL3_PC          0x39
51 #define LP5523_REG_STATUS               0x3a
52 #define LP5523_REG_GPO                  0x3b
53 #define LP5523_REG_VARIABLE             0x3c
54 #define LP5523_REG_RESET                0x3d
55 #define LP5523_REG_TEMP_CTRL            0x3e
56 #define LP5523_REG_TEMP_READ            0x3f
57 #define LP5523_REG_TEMP_WRITE           0x40
58 #define LP5523_REG_LED_TEST_CTRL        0x41
59 #define LP5523_REG_LED_TEST_ADC         0x42
60 #define LP5523_REG_ENG1_VARIABLE        0x45
61 #define LP5523_REG_ENG2_VARIABLE        0x46
62 #define LP5523_REG_ENG3_VARIABLE        0x47
63 #define LP5523_REG_MASTER_FADER1        0x48
64 #define LP5523_REG_MASTER_FADER2        0x49
65 #define LP5523_REG_MASTER_FADER3        0x4a
66 #define LP5523_REG_CH1_PROG_START       0x4c
67 #define LP5523_REG_CH2_PROG_START       0x4d
68 #define LP5523_REG_CH3_PROG_START       0x4e
69 #define LP5523_REG_PROG_PAGE_SEL        0x4f
70 #define LP5523_REG_PROG_MEM             0x50
71
72 #define LP5523_CMD_LOAD                 0x15 /* 00010101 */
73 #define LP5523_CMD_RUN                  0x2a /* 00101010 */
74 #define LP5523_CMD_DISABLED             0x00 /* 00000000 */
75
76 #define LP5523_ENABLE                   0x40
77 #define LP5523_AUTO_INC                 0x40
78 #define LP5523_PWR_SAVE                 0x20
79 #define LP5523_PWM_PWR_SAVE             0x04
80 #define LP5523_CP_1                     0x08
81 #define LP5523_CP_1_5                   0x10
82 #define LP5523_CP_AUTO                  0x18
83 #define LP5523_INT_CLK                  0x01
84 #define LP5523_AUTO_CLK                 0x02
85 #define LP5523_EN_LEDTEST               0x80
86 #define LP5523_LEDTEST_DONE             0x80
87
88 #define LP5523_DEFAULT_CURRENT          50 /* microAmps */
89 #define LP5523_PROGRAM_LENGTH           32 /* in bytes */
90 #define LP5523_PROGRAM_PAGES            6
91 #define LP5523_ADC_SHORTCIRC_LIM        80
92
93 #define LP5523_LEDS                     9
94 #define LP5523_ENGINES                  3
95
96 #define LP5523_ENG_MASK_BASE            0x30 /* 00110000 */
97
98 #define LP5523_ENG_STATUS_MASK          0x07 /* 00000111 */
99
100 #define LP5523_IRQ_FLAGS                IRQF_TRIGGER_FALLING
101
102 #define LP5523_EXT_CLK_USED             0x08
103
104 #define LED_ACTIVE(mux, led)            (!!(mux & (0x0001 << led)))
105 #define SHIFT_MASK(id)                  (((id) - 1) * 2)
106
107 enum lp5523_chip_id {
108         LP5523,
109         LP55231,
110 };
111
112 struct lp5523_engine {
113         int             id;
114         u8              mode;
115         u8              prog_page;
116         u8              mux_page;
117         u16             led_mux;
118         u8              engine_mask;
119 };
120
121 struct lp5523_led {
122         int                     id;
123         u8                      chan_nr;
124         u8                      led_current;
125         u8                      max_current;
126         struct led_classdev     cdev;
127         struct work_struct      brightness_work;
128         u8                      brightness;
129 };
130
131 struct lp5523_chip {
132         struct mutex            lock; /* Serialize control */
133         struct i2c_client       *client;
134         struct lp5523_engine    engines[LP5523_ENGINES];
135         struct lp5523_led       leds[LP5523_LEDS];
136         struct lp5523_platform_data *pdata;
137         u8                      num_channels;
138         u8                      num_leds;
139 };
140
141 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
142 {
143         return container_of(cdev, struct lp5523_led, cdev);
144 }
145
146 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
147 {
148         return container_of(engine, struct lp5523_chip,
149                             engines[engine->id - 1]);
150 }
151
152 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
153 {
154         return container_of(led, struct lp5523_chip,
155                             leds[led->id]);
156 }
157
158 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
159 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
160 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
161
162 static void lp5523_led_brightness_work(struct work_struct *work);
163
164 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
165 {
166         return i2c_smbus_write_byte_data(client, reg, value);
167 }
168
169 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
170 {
171         s32 ret = i2c_smbus_read_byte_data(client, reg);
172
173         if (ret < 0)
174                 return -EIO;
175
176         *buf = ret;
177         return 0;
178 }
179
180 static int lp5523_detect(struct i2c_client *client)
181 {
182         int ret;
183         u8 buf;
184
185         ret = lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
186         if (ret)
187                 return ret;
188         ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
189         if (ret)
190                 return ret;
191         if (buf == 0x40)
192                 return 0;
193         else
194                 return -ENODEV;
195 }
196
197 static int lp5523_configure(struct i2c_client *client)
198 {
199         struct lp5523_chip *chip = i2c_get_clientdata(client);
200         int ret = 0;
201         u8 status;
202
203         /* one pattern per engine setting led mux start and stop addresses */
204         static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
205                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
206                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
207                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
208         };
209
210         ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
211         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
212         usleep_range(1000, 2000);
213
214         ret |= lp5523_write(client, LP5523_REG_CONFIG,
215                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
216                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
217                             LP5523_PWM_PWR_SAVE);
218
219         /* turn on all leds */
220         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
221         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
222
223         /* hardcode 32 bytes of memory for each engine from program memory */
224         ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
225         ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
226         ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
227
228         /* write led mux address space for each channel */
229         ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
230         ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
231         ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
232
233         if (ret) {
234                 dev_err(&client->dev, "could not load mux programs\n");
235                 return -1;
236         }
237
238         /* set all engines exec state and mode to run 00101010 */
239         ret |= lp5523_write(client, LP5523_REG_ENABLE,
240                             (LP5523_CMD_RUN | LP5523_ENABLE));
241
242         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
243
244         if (ret) {
245                 dev_err(&client->dev, "could not start mux programs\n");
246                 return -1;
247         }
248
249         /* Let the programs run for couple of ms and check the engine status */
250         usleep_range(3000, 6000);
251         lp5523_read(client, LP5523_REG_STATUS, &status);
252         status &= LP5523_ENG_STATUS_MASK;
253
254         if (status == LP5523_ENG_STATUS_MASK) {
255                 dev_dbg(&client->dev, "all engines configured\n");
256         } else {
257                 dev_info(&client->dev, "status == %x\n", status);
258                 dev_err(&client->dev, "cound not configure LED engine\n");
259                 return -1;
260         }
261
262         dev_info(&client->dev, "disabling engines\n");
263
264         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
265
266         return ret;
267 }
268
269 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
270 {
271         struct lp5523_chip *chip = engine_to_lp5523(engine);
272         struct i2c_client *client = chip->client;
273         int ret;
274         u8 engine_state;
275
276         ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
277         if (ret)
278                 goto fail;
279
280         engine_state &= ~(engine->engine_mask);
281
282         /* set mode only for this engine */
283         mode &= engine->engine_mask;
284
285         engine_state |= mode;
286
287         ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
288 fail:
289         return ret;
290 }
291
292 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
293 {
294         struct lp5523_chip *chip = engine_to_lp5523(engine);
295         struct i2c_client *client = chip->client;
296         int ret = 0;
297
298         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
299
300         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
301         ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
302                             (u8)(mux >> 8));
303         ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
304         engine->led_mux = mux;
305
306         return ret;
307 }
308
309 static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern)
310 {
311         struct lp5523_chip *chip = engine_to_lp5523(engine);
312         struct i2c_client *client = chip->client;
313
314         int ret = 0;
315
316         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
317
318         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
319                             engine->prog_page);
320         ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
321                                               LP5523_PROGRAM_LENGTH, pattern);
322
323         return ret;
324 }
325
326 static int lp5523_run_program(struct lp5523_engine *engine)
327 {
328         struct lp5523_chip *chip = engine_to_lp5523(engine);
329         struct i2c_client *client = chip->client;
330         int ret;
331
332         ret = lp5523_write(client, LP5523_REG_ENABLE,
333                                         LP5523_CMD_RUN | LP5523_ENABLE);
334         if (ret)
335                 goto fail;
336
337         ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
338 fail:
339         return ret;
340 }
341
342 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
343 {
344         int i;
345         u16 tmp_mux = 0;
346
347         len = min_t(int, len, LP5523_LEDS);
348         for (i = 0; i < len; i++) {
349                 switch (buf[i]) {
350                 case '1':
351                         tmp_mux |= (1 << i);
352                         break;
353                 case '0':
354                         break;
355                 case '\n':
356                         i = len;
357                         break;
358                 default:
359                         return -1;
360                 }
361         }
362         *mux = tmp_mux;
363
364         return 0;
365 }
366
367 static void lp5523_mux_to_array(u16 led_mux, char *array)
368 {
369         int i, pos = 0;
370         for (i = 0; i < LP5523_LEDS; i++)
371                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
372
373         array[pos] = '\0';
374 }
375
376 /*--------------------------------------------------------------*/
377 /*                      Sysfs interface                         */
378 /*--------------------------------------------------------------*/
379
380 static ssize_t show_engine_leds(struct device *dev,
381                             struct device_attribute *attr,
382                             char *buf, int nr)
383 {
384         struct i2c_client *client = to_i2c_client(dev);
385         struct lp5523_chip *chip = i2c_get_clientdata(client);
386         char mux[LP5523_LEDS + 1];
387
388         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
389
390         return sprintf(buf, "%s\n", mux);
391 }
392
393 #define show_leds(nr)                                                   \
394 static ssize_t show_engine##nr##_leds(struct device *dev,               \
395                             struct device_attribute *attr,              \
396                             char *buf)                                  \
397 {                                                                       \
398         return show_engine_leds(dev, attr, buf, nr);                    \
399 }
400 show_leds(1)
401 show_leds(2)
402 show_leds(3)
403
404 static ssize_t store_engine_leds(struct device *dev,
405                              struct device_attribute *attr,
406                              const char *buf, size_t len, int nr)
407 {
408         struct i2c_client *client = to_i2c_client(dev);
409         struct lp5523_chip *chip = i2c_get_clientdata(client);
410         u16 mux = 0;
411         ssize_t ret;
412
413         if (lp5523_mux_parse(buf, &mux, len))
414                 return -EINVAL;
415
416         mutex_lock(&chip->lock);
417         ret = -EINVAL;
418         if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
419                 goto leave;
420
421         if (lp5523_load_mux(&chip->engines[nr - 1], mux))
422                 goto leave;
423
424         ret = len;
425 leave:
426         mutex_unlock(&chip->lock);
427         return ret;
428 }
429
430 #define store_leds(nr)                                          \
431 static ssize_t store_engine##nr##_leds(struct device *dev,      \
432                              struct device_attribute *attr,     \
433                              const char *buf, size_t len)       \
434 {                                                               \
435         return store_engine_leds(dev, attr, buf, len, nr);      \
436 }
437 store_leds(1)
438 store_leds(2)
439 store_leds(3)
440
441 static ssize_t lp5523_selftest(struct device *dev,
442                                struct device_attribute *attr,
443                                char *buf)
444 {
445         struct i2c_client *client = to_i2c_client(dev);
446         struct lp5523_chip *chip = i2c_get_clientdata(client);
447         int i, ret, pos = 0;
448         int led = 0;
449         u8 status, adc, vdd;
450
451         mutex_lock(&chip->lock);
452
453         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
454         if (ret < 0)
455                 goto fail;
456
457         /* Check that ext clock is really in use if requested */
458         if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
459                 if  ((status & LP5523_EXT_CLK_USED) == 0)
460                         goto fail;
461
462         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
463         lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
464                                     LP5523_EN_LEDTEST | 16);
465         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
466         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
467         if (!(status & LP5523_LEDTEST_DONE))
468                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
469
470         ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
471         vdd--;  /* There may be some fluctuation in measurement */
472
473         for (i = 0; i < LP5523_LEDS; i++) {
474                 /* Skip non-existing channels */
475                 if (chip->pdata->led_config[i].led_current == 0)
476                         continue;
477
478                 /* Set default current */
479                 lp5523_write(chip->client,
480                         LP5523_REG_LED_CURRENT_BASE + i,
481                         chip->pdata->led_config[i].led_current);
482
483                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
484                 /* let current stabilize 2 - 4ms before measurements start */
485                 usleep_range(2000, 4000);
486                 lp5523_write(chip->client,
487                              LP5523_REG_LED_TEST_CTRL,
488                              LP5523_EN_LEDTEST | i);
489                 /* ADC conversion time is 2.7 ms typically */
490                 usleep_range(3000, 6000);
491                 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
492                 if (!(status & LP5523_LEDTEST_DONE))
493                         usleep_range(3000, 6000);/* Was not ready. Wait. */
494                 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
495
496                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
497                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
498
499                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
500
501                 /* Restore current */
502                 lp5523_write(chip->client,
503                         LP5523_REG_LED_CURRENT_BASE + i,
504                         chip->leds[led].led_current);
505                 led++;
506         }
507         if (pos == 0)
508                 pos = sprintf(buf, "OK\n");
509         goto release_lock;
510 fail:
511         pos = sprintf(buf, "FAIL\n");
512
513 release_lock:
514         mutex_unlock(&chip->lock);
515
516         return pos;
517 }
518
519 static void lp5523_set_brightness(struct led_classdev *cdev,
520                              enum led_brightness brightness)
521 {
522         struct lp5523_led *led = cdev_to_led(cdev);
523
524         led->brightness = (u8)brightness;
525
526         schedule_work(&led->brightness_work);
527 }
528
529 static void lp5523_led_brightness_work(struct work_struct *work)
530 {
531         struct lp5523_led *led = container_of(work,
532                                               struct lp5523_led,
533                                               brightness_work);
534         struct lp5523_chip *chip = led_to_lp5523(led);
535         struct i2c_client *client = chip->client;
536
537         mutex_lock(&chip->lock);
538
539         lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
540                      led->brightness);
541
542         mutex_unlock(&chip->lock);
543 }
544
545 static int lp5523_do_store_load(struct lp5523_engine *engine,
546                                 const char *buf, size_t len)
547 {
548         struct lp5523_chip *chip = engine_to_lp5523(engine);
549         struct i2c_client *client = chip->client;
550         int  ret, nrchars, offset = 0, i = 0;
551         char c[3];
552         unsigned cmd;
553         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
554
555         if (engine->mode != LP5523_CMD_LOAD)
556                 return -EINVAL;
557
558         while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
559                 /* separate sscanfs because length is working only for %s */
560                 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
561                 ret = sscanf(c, "%2x", &cmd);
562                 if (ret != 1)
563                         goto fail;
564                 pattern[i] = (u8)cmd;
565
566                 offset += nrchars;
567                 i++;
568         }
569
570         /* Each instruction is 16bit long. Check that length is even */
571         if (i % 2)
572                 goto fail;
573
574         mutex_lock(&chip->lock);
575         ret = lp5523_load_program(engine, pattern);
576         mutex_unlock(&chip->lock);
577
578         if (ret) {
579                 dev_err(&client->dev, "failed loading pattern\n");
580                 return ret;
581         }
582
583         return len;
584 fail:
585         dev_err(&client->dev, "wrong pattern format\n");
586         return -EINVAL;
587 }
588
589 static ssize_t store_engine_load(struct device *dev,
590                                      struct device_attribute *attr,
591                                      const char *buf, size_t len, int nr)
592 {
593         struct i2c_client *client = to_i2c_client(dev);
594         struct lp5523_chip *chip = i2c_get_clientdata(client);
595         return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
596 }
597
598 #define store_load(nr)                                                  \
599 static ssize_t store_engine##nr##_load(struct device *dev,              \
600                                      struct device_attribute *attr,     \
601                                      const char *buf, size_t len)       \
602 {                                                                       \
603         return store_engine_load(dev, attr, buf, len, nr);              \
604 }
605 store_load(1)
606 store_load(2)
607 store_load(3)
608
609 static ssize_t show_engine_mode(struct device *dev,
610                                 struct device_attribute *attr,
611                                 char *buf, int nr)
612 {
613         struct i2c_client *client = to_i2c_client(dev);
614         struct lp5523_chip *chip = i2c_get_clientdata(client);
615         switch (chip->engines[nr - 1].mode) {
616         case LP5523_CMD_RUN:
617                 return sprintf(buf, "run\n");
618         case LP5523_CMD_LOAD:
619                 return sprintf(buf, "load\n");
620         case LP5523_CMD_DISABLED:
621                 return sprintf(buf, "disabled\n");
622         default:
623                 return sprintf(buf, "disabled\n");
624         }
625 }
626
627 #define show_mode(nr)                                                   \
628 static ssize_t show_engine##nr##_mode(struct device *dev,               \
629                                     struct device_attribute *attr,      \
630                                     char *buf)                          \
631 {                                                                       \
632         return show_engine_mode(dev, attr, buf, nr);                    \
633 }
634 show_mode(1)
635 show_mode(2)
636 show_mode(3)
637
638 static ssize_t store_engine_mode(struct device *dev,
639                                  struct device_attribute *attr,
640                                  const char *buf, size_t len, int nr)
641 {
642         struct i2c_client *client = to_i2c_client(dev);
643         struct lp5523_chip *chip = i2c_get_clientdata(client);
644         struct lp5523_engine *engine = &chip->engines[nr - 1];
645         mutex_lock(&chip->lock);
646
647         if (!strncmp(buf, "run", 3))
648                 lp5523_set_mode(engine, LP5523_CMD_RUN);
649         else if (!strncmp(buf, "load", 4))
650                 lp5523_set_mode(engine, LP5523_CMD_LOAD);
651         else if (!strncmp(buf, "disabled", 8))
652                 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
653
654         mutex_unlock(&chip->lock);
655         return len;
656 }
657
658 #define store_mode(nr)                                                  \
659 static ssize_t store_engine##nr##_mode(struct device *dev,              \
660                                      struct device_attribute *attr,     \
661                                      const char *buf, size_t len)       \
662 {                                                                       \
663         return store_engine_mode(dev, attr, buf, len, nr);              \
664 }
665 store_mode(1)
666 store_mode(2)
667 store_mode(3)
668
669 static ssize_t show_max_current(struct device *dev,
670                             struct device_attribute *attr,
671                             char *buf)
672 {
673         struct led_classdev *led_cdev = dev_get_drvdata(dev);
674         struct lp5523_led *led = cdev_to_led(led_cdev);
675
676         return sprintf(buf, "%d\n", led->max_current);
677 }
678
679 static ssize_t show_current(struct device *dev,
680                             struct device_attribute *attr,
681                             char *buf)
682 {
683         struct led_classdev *led_cdev = dev_get_drvdata(dev);
684         struct lp5523_led *led = cdev_to_led(led_cdev);
685
686         return sprintf(buf, "%d\n", led->led_current);
687 }
688
689 static ssize_t store_current(struct device *dev,
690                              struct device_attribute *attr,
691                              const char *buf, size_t len)
692 {
693         struct led_classdev *led_cdev = dev_get_drvdata(dev);
694         struct lp5523_led *led = cdev_to_led(led_cdev);
695         struct lp5523_chip *chip = led_to_lp5523(led);
696         ssize_t ret;
697         unsigned long curr;
698
699         if (strict_strtoul(buf, 0, &curr))
700                 return -EINVAL;
701
702         if (curr > led->max_current)
703                 return -EINVAL;
704
705         mutex_lock(&chip->lock);
706         ret = lp5523_write(chip->client,
707                         LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
708                         (u8)curr);
709         mutex_unlock(&chip->lock);
710
711         if (ret < 0)
712                 return ret;
713
714         led->led_current = (u8)curr;
715
716         return len;
717 }
718
719 /* led class device attributes */
720 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
721 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
722
723 static struct attribute *lp5523_led_attributes[] = {
724         &dev_attr_led_current.attr,
725         &dev_attr_max_current.attr,
726         NULL,
727 };
728
729 static struct attribute_group lp5523_led_attribute_group = {
730         .attrs = lp5523_led_attributes
731 };
732
733 /* device attributes */
734 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
735                    show_engine1_mode, store_engine1_mode);
736 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
737                    show_engine2_mode, store_engine2_mode);
738 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
739                    show_engine3_mode, store_engine3_mode);
740 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
741                    show_engine1_leds, store_engine1_leds);
742 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
743                    show_engine2_leds, store_engine2_leds);
744 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
745                    show_engine3_leds, store_engine3_leds);
746 static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
747 static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
748 static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
749 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
750
751 static struct attribute *lp5523_attributes[] = {
752         &dev_attr_engine1_mode.attr,
753         &dev_attr_engine2_mode.attr,
754         &dev_attr_engine3_mode.attr,
755         &dev_attr_selftest.attr,
756         &dev_attr_engine1_load.attr,
757         &dev_attr_engine1_leds.attr,
758         &dev_attr_engine2_load.attr,
759         &dev_attr_engine2_leds.attr,
760         &dev_attr_engine3_load.attr,
761         &dev_attr_engine3_leds.attr,
762         NULL,
763 };
764
765 static const struct attribute_group lp5523_group = {
766         .attrs = lp5523_attributes,
767 };
768
769 static int lp5523_register_sysfs(struct i2c_client *client)
770 {
771         struct device *dev = &client->dev;
772         int ret;
773
774         ret = sysfs_create_group(&dev->kobj, &lp5523_group);
775         if (ret < 0)
776                 return ret;
777
778         return 0;
779 }
780
781 static void lp5523_unregister_sysfs(struct i2c_client *client)
782 {
783         struct lp5523_chip *chip = i2c_get_clientdata(client);
784         struct device *dev = &client->dev;
785         int i;
786
787         sysfs_remove_group(&dev->kobj, &lp5523_group);
788
789         for (i = 0; i < chip->num_leds; i++)
790                 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
791                                 &lp5523_led_attribute_group);
792 }
793
794 /*--------------------------------------------------------------*/
795 /*                      Set chip operating mode                 */
796 /*--------------------------------------------------------------*/
797 static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
798 {
799         /* if in that mode already do nothing, except for run */
800         if (mode == engine->mode && mode != LP5523_CMD_RUN)
801                 return;
802
803         switch (mode) {
804         case LP5523_CMD_RUN:
805                 lp5523_run_program(engine);
806                 break;
807         case LP5523_CMD_LOAD:
808                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
809                 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
810                 break;
811         case LP5523_CMD_DISABLED:
812                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
813                 break;
814         default:
815                 return;
816         }
817
818         engine->mode = mode;
819 }
820
821 /*--------------------------------------------------------------*/
822 /*                      Probe, Attach, Remove                   */
823 /*--------------------------------------------------------------*/
824 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
825 {
826         if (id < 1 || id > LP5523_ENGINES)
827                 return -1;
828         engine->id = id;
829         engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
830         engine->prog_page = id - 1;
831         engine->mux_page = id + 2;
832
833         return 0;
834 }
835
836 static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev,
837                            int chan, struct lp5523_platform_data *pdata,
838                            const char *chip_name)
839 {
840         char name[32];
841         int res;
842
843         if (chan >= LP5523_LEDS)
844                 return -EINVAL;
845
846         if (pdata->led_config[chan].led_current) {
847                 led->led_current = pdata->led_config[chan].led_current;
848                 led->max_current = pdata->led_config[chan].max_current;
849                 led->chan_nr = pdata->led_config[chan].chan_nr;
850
851                 if (led->chan_nr >= LP5523_LEDS) {
852                         dev_err(dev, "Use channel numbers between 0 and %d\n",
853                                 LP5523_LEDS - 1);
854                         return -EINVAL;
855                 }
856
857                 if (pdata->led_config[chan].name) {
858                         led->cdev.name = pdata->led_config[chan].name;
859                 } else {
860                         snprintf(name, sizeof(name), "%s:channel%d",
861                                 pdata->label ? : chip_name, chan);
862                         led->cdev.name = name;
863                 }
864
865                 led->cdev.brightness_set = lp5523_set_brightness;
866                 res = led_classdev_register(dev, &led->cdev);
867                 if (res < 0) {
868                         dev_err(dev, "couldn't register led on channel %d\n",
869                                 chan);
870                         return res;
871                 }
872                 res = sysfs_create_group(&led->cdev.dev->kobj,
873                                 &lp5523_led_attribute_group);
874                 if (res < 0) {
875                         dev_err(dev, "couldn't register current attribute\n");
876                         led_classdev_unregister(&led->cdev);
877                         return res;
878                 }
879         } else {
880                 led->led_current = 0;
881         }
882         return 0;
883 }
884
885 static int __devinit lp5523_probe(struct i2c_client *client,
886                         const struct i2c_device_id *id)
887 {
888         struct lp5523_chip              *chip;
889         struct lp5523_platform_data     *pdata;
890         int ret, i, led;
891
892         chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
893         if (!chip)
894                 return -ENOMEM;
895
896         i2c_set_clientdata(client, chip);
897         chip->client = client;
898
899         pdata = client->dev.platform_data;
900
901         if (!pdata) {
902                 dev_err(&client->dev, "no platform data\n");
903                 return -EINVAL;
904         }
905
906         mutex_init(&chip->lock);
907
908         chip->pdata   = pdata;
909
910         if (pdata->setup_resources) {
911                 ret = pdata->setup_resources();
912                 if (ret < 0)
913                         return ret;
914         }
915
916         if (pdata->enable) {
917                 pdata->enable(0);
918                 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
919                 pdata->enable(1);
920                 usleep_range(1000, 2000); /* 500us abs min. */
921         }
922
923         lp5523_write(client, LP5523_REG_RESET, 0xff);
924         usleep_range(10000, 20000); /*
925                                      * Exact value is not available. 10 - 20ms
926                                      * appears to be enough for reset.
927                                      */
928         ret = lp5523_detect(client);
929         if (ret)
930                 goto fail1;
931
932         dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
933
934         /* Initialize engines */
935         for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
936                 ret = lp5523_init_engine(&chip->engines[i], i + 1);
937                 if (ret) {
938                         dev_err(&client->dev, "error initializing engine\n");
939                         goto fail1;
940                 }
941         }
942         ret = lp5523_configure(client);
943         if (ret < 0) {
944                 dev_err(&client->dev, "error configuring chip\n");
945                 goto fail1;
946         }
947
948         /* Initialize leds */
949         chip->num_channels = pdata->num_channels;
950         chip->num_leds = 0;
951         led = 0;
952         for (i = 0; i < pdata->num_channels; i++) {
953                 /* Do not initialize channels that are not connected */
954                 if (pdata->led_config[i].led_current == 0)
955                         continue;
956
957                 INIT_WORK(&chip->leds[led].brightness_work,
958                         lp5523_led_brightness_work);
959
960                 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata,
961                                 id->name);
962                 if (ret) {
963                         dev_err(&client->dev, "error initializing leds\n");
964                         goto fail2;
965                 }
966                 chip->num_leds++;
967
968                 chip->leds[led].id = led;
969                 /* Set LED current */
970                 lp5523_write(client,
971                           LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
972                           chip->leds[led].led_current);
973
974                 led++;
975         }
976
977         ret = lp5523_register_sysfs(client);
978         if (ret) {
979                 dev_err(&client->dev, "registering sysfs failed\n");
980                 goto fail2;
981         }
982         return ret;
983 fail2:
984         for (i = 0; i < chip->num_leds; i++) {
985                 led_classdev_unregister(&chip->leds[i].cdev);
986                 flush_work(&chip->leds[i].brightness_work);
987         }
988 fail1:
989         if (pdata->enable)
990                 pdata->enable(0);
991         if (pdata->release_resources)
992                 pdata->release_resources();
993         return ret;
994 }
995
996 static int lp5523_remove(struct i2c_client *client)
997 {
998         struct lp5523_chip *chip = i2c_get_clientdata(client);
999         int i;
1000
1001         /* Disable engine mode */
1002         lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
1003
1004         lp5523_unregister_sysfs(client);
1005
1006         for (i = 0; i < chip->num_leds; i++) {
1007                 led_classdev_unregister(&chip->leds[i].cdev);
1008                 flush_work(&chip->leds[i].brightness_work);
1009         }
1010
1011         if (chip->pdata->enable)
1012                 chip->pdata->enable(0);
1013         if (chip->pdata->release_resources)
1014                 chip->pdata->release_resources();
1015         return 0;
1016 }
1017
1018 static const struct i2c_device_id lp5523_id[] = {
1019         { "lp5523",  LP5523 },
1020         { "lp55231", LP55231 },
1021         { }
1022 };
1023
1024 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1025
1026 static struct i2c_driver lp5523_driver = {
1027         .driver = {
1028                 .name   = "lp5523x",
1029         },
1030         .probe          = lp5523_probe,
1031         .remove         = lp5523_remove,
1032         .id_table       = lp5523_id,
1033 };
1034
1035 module_i2c_driver(lp5523_driver);
1036
1037 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1038 MODULE_DESCRIPTION("LP5523 LED engine");
1039 MODULE_LICENSE("GPL");