hwmon: (adt7411) add MODULE_DEVICE_TABLE
[linux-2.6.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 struct lp5523_engine {
108         int             id;
109         u8              mode;
110         u8              prog_page;
111         u8              mux_page;
112         u16             led_mux;
113         u8              engine_mask;
114 };
115
116 struct lp5523_led {
117         int                     id;
118         u8                      chan_nr;
119         u8                      led_current;
120         u8                      max_current;
121         struct led_classdev     cdev;
122         struct work_struct      brightness_work;
123         u8                      brightness;
124 };
125
126 struct lp5523_chip {
127         struct mutex            lock; /* Serialize control */
128         struct i2c_client       *client;
129         struct lp5523_engine    engines[LP5523_ENGINES];
130         struct lp5523_led       leds[LP5523_LEDS];
131         struct lp5523_platform_data *pdata;
132         u8                      num_channels;
133         u8                      num_leds;
134 };
135
136 static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
137 {
138         return container_of(cdev, struct lp5523_led, cdev);
139 }
140
141 static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
142 {
143         return container_of(engine, struct lp5523_chip,
144                             engines[engine->id - 1]);
145 }
146
147 static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
148 {
149         return container_of(led, struct lp5523_chip,
150                             leds[led->id]);
151 }
152
153 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
154 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
155 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
156
157 static void lp5523_led_brightness_work(struct work_struct *work);
158
159 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
160 {
161         return i2c_smbus_write_byte_data(client, reg, value);
162 }
163
164 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
165 {
166         s32 ret = i2c_smbus_read_byte_data(client, reg);
167
168         if (ret < 0)
169                 return -EIO;
170
171         *buf = ret;
172         return 0;
173 }
174
175 static int lp5523_detect(struct i2c_client *client)
176 {
177         int ret;
178         u8 buf;
179
180         ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40);
181         if (ret)
182                 return ret;
183         ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
184         if (ret)
185                 return ret;
186         if (buf == 0x40)
187                 return 0;
188         else
189                 return -ENODEV;
190 }
191
192 static int lp5523_configure(struct i2c_client *client)
193 {
194         struct lp5523_chip *chip = i2c_get_clientdata(client);
195         int ret = 0;
196         u8 status;
197
198         /* one pattern per engine setting led mux start and stop addresses */
199         u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
200                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
201                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
202                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
203         };
204
205         ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
206         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
207         usleep_range(1000, 2000);
208
209         ret |= lp5523_write(client, LP5523_REG_CONFIG,
210                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
211                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
212                             LP5523_PWM_PWR_SAVE);
213
214         /* turn on all leds */
215         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
216         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
217
218         /* hardcode 32 bytes of memory for each engine from program memory */
219         ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
220         ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
221         ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
222
223         /* write led mux address space for each channel */
224         ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
225         ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
226         ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
227
228         if (ret) {
229                 dev_err(&client->dev, "could not load mux programs\n");
230                 return -1;
231         }
232
233         /* set all engines exec state and mode to run 00101010 */
234         ret |= lp5523_write(client, LP5523_REG_ENABLE,
235                             (LP5523_CMD_RUN | LP5523_ENABLE));
236
237         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
238
239         if (ret) {
240                 dev_err(&client->dev, "could not start mux programs\n");
241                 return -1;
242         }
243
244         /* Let the programs run for couple of ms and check the engine status */
245         usleep_range(3000, 6000);
246         lp5523_read(client, LP5523_REG_STATUS, &status);
247         status &= LP5523_ENG_STATUS_MASK;
248
249         if (status == LP5523_ENG_STATUS_MASK) {
250                 dev_dbg(&client->dev, "all engines configured\n");
251         } else {
252                 dev_info(&client->dev, "status == %x\n", status);
253                 dev_err(&client->dev, "cound not configure LED engine\n");
254                 return -1;
255         }
256
257         dev_info(&client->dev, "disabling engines\n");
258
259         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
260
261         return ret;
262 }
263
264 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
265 {
266         struct lp5523_chip *chip = engine_to_lp5523(engine);
267         struct i2c_client *client = chip->client;
268         int ret;
269         u8 engine_state;
270
271         ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
272         if (ret)
273                 goto fail;
274
275         engine_state &= ~(engine->engine_mask);
276
277         /* set mode only for this engine */
278         mode &= engine->engine_mask;
279
280         engine_state |= mode;
281
282         ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
283 fail:
284         return ret;
285 }
286
287 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
288 {
289         struct lp5523_chip *chip = engine_to_lp5523(engine);
290         struct i2c_client *client = chip->client;
291         int ret = 0;
292
293         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
294
295         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
296         ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
297                             (u8)(mux >> 8));
298         ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
299         engine->led_mux = mux;
300
301         return ret;
302 }
303
304 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern)
305 {
306         struct lp5523_chip *chip = engine_to_lp5523(engine);
307         struct i2c_client *client = chip->client;
308
309         int ret = 0;
310
311         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
312
313         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
314                             engine->prog_page);
315         ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
316                                               LP5523_PROGRAM_LENGTH, pattern);
317
318         return ret;
319 }
320
321 static int lp5523_run_program(struct lp5523_engine *engine)
322 {
323         struct lp5523_chip *chip = engine_to_lp5523(engine);
324         struct i2c_client *client = chip->client;
325         int ret;
326
327         ret = lp5523_write(client, LP5523_REG_ENABLE,
328                                         LP5523_CMD_RUN | LP5523_ENABLE);
329         if (ret)
330                 goto fail;
331
332         ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
333 fail:
334         return ret;
335 }
336
337 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
338 {
339         int i;
340         u16 tmp_mux = 0;
341         len = len < LP5523_LEDS ? len : LP5523_LEDS;
342         for (i = 0; i < len; i++) {
343                 switch (buf[i]) {
344                 case '1':
345                         tmp_mux |= (1 << i);
346                         break;
347                 case '0':
348                         break;
349                 case '\n':
350                         i = len;
351                         break;
352                 default:
353                         return -1;
354                 }
355         }
356         *mux = tmp_mux;
357
358         return 0;
359 }
360
361 static void lp5523_mux_to_array(u16 led_mux, char *array)
362 {
363         int i, pos = 0;
364         for (i = 0; i < LP5523_LEDS; i++)
365                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
366
367         array[pos] = '\0';
368 }
369
370 /*--------------------------------------------------------------*/
371 /*                      Sysfs interface                         */
372 /*--------------------------------------------------------------*/
373
374 static ssize_t show_engine_leds(struct device *dev,
375                             struct device_attribute *attr,
376                             char *buf, int nr)
377 {
378         struct i2c_client *client = to_i2c_client(dev);
379         struct lp5523_chip *chip = i2c_get_clientdata(client);
380         char mux[LP5523_LEDS + 1];
381
382         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
383
384         return sprintf(buf, "%s\n", mux);
385 }
386
387 #define show_leds(nr)                                                   \
388 static ssize_t show_engine##nr##_leds(struct device *dev,               \
389                             struct device_attribute *attr,              \
390                             char *buf)                                  \
391 {                                                                       \
392         return show_engine_leds(dev, attr, buf, nr);                    \
393 }
394 show_leds(1)
395 show_leds(2)
396 show_leds(3)
397
398 static ssize_t store_engine_leds(struct device *dev,
399                              struct device_attribute *attr,
400                              const char *buf, size_t len, int nr)
401 {
402         struct i2c_client *client = to_i2c_client(dev);
403         struct lp5523_chip *chip = i2c_get_clientdata(client);
404         u16 mux = 0;
405         ssize_t ret;
406
407         if (lp5523_mux_parse(buf, &mux, len))
408                 return -EINVAL;
409
410         mutex_lock(&chip->lock);
411         ret = -EINVAL;
412         if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
413                 goto leave;
414
415         if (lp5523_load_mux(&chip->engines[nr - 1], mux))
416                 goto leave;
417
418         ret = len;
419 leave:
420         mutex_unlock(&chip->lock);
421         return ret;
422 }
423
424 #define store_leds(nr)                                          \
425 static ssize_t store_engine##nr##_leds(struct device *dev,      \
426                              struct device_attribute *attr,     \
427                              const char *buf, size_t len)       \
428 {                                                               \
429         return store_engine_leds(dev, attr, buf, len, nr);      \
430 }
431 store_leds(1)
432 store_leds(2)
433 store_leds(3)
434
435 static ssize_t lp5523_selftest(struct device *dev,
436                                struct device_attribute *attr,
437                                char *buf)
438 {
439         struct i2c_client *client = to_i2c_client(dev);
440         struct lp5523_chip *chip = i2c_get_clientdata(client);
441         int i, ret, pos = 0;
442         int led = 0;
443         u8 status, adc, vdd;
444
445         mutex_lock(&chip->lock);
446
447         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
448         if (ret < 0)
449                 goto fail;
450
451         /* Check that ext clock is really in use if requested */
452         if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
453                 if  ((status & LP5523_EXT_CLK_USED) == 0)
454                         goto fail;
455
456         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
457         lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
458                                     LP5523_EN_LEDTEST | 16);
459         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
460         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
461         if (!(status & LP5523_LEDTEST_DONE))
462                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
463
464         ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
465         vdd--;  /* There may be some fluctuation in measurement */
466
467         for (i = 0; i < LP5523_LEDS; i++) {
468                 /* Skip non-existing channels */
469                 if (chip->pdata->led_config[i].led_current == 0)
470                         continue;
471
472                 /* Set default current */
473                 lp5523_write(chip->client,
474                         LP5523_REG_LED_CURRENT_BASE + i,
475                         chip->pdata->led_config[i].led_current);
476
477                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
478                 /* let current stabilize 2 - 4ms before measurements start */
479                 usleep_range(2000, 4000);
480                 lp5523_write(chip->client,
481                              LP5523_REG_LED_TEST_CTRL,
482                              LP5523_EN_LEDTEST | i);
483                 /* ADC conversion time is 2.7 ms typically */
484                 usleep_range(3000, 6000);
485                 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
486                 if (!(status & LP5523_LEDTEST_DONE))
487                         usleep_range(3000, 6000);/* Was not ready. Wait. */
488                 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
489
490                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
491                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
492
493                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
494
495                 /* Restore current */
496                 lp5523_write(chip->client,
497                         LP5523_REG_LED_CURRENT_BASE + i,
498                         chip->leds[led].led_current);
499                 led++;
500         }
501         if (pos == 0)
502                 pos = sprintf(buf, "OK\n");
503         goto release_lock;
504 fail:
505         pos = sprintf(buf, "FAIL\n");
506
507 release_lock:
508         mutex_unlock(&chip->lock);
509
510         return pos;
511 }
512
513 static void lp5523_set_brightness(struct led_classdev *cdev,
514                              enum led_brightness brightness)
515 {
516         struct lp5523_led *led = cdev_to_led(cdev);
517
518         led->brightness = (u8)brightness;
519
520         schedule_work(&led->brightness_work);
521 }
522
523 static void lp5523_led_brightness_work(struct work_struct *work)
524 {
525         struct lp5523_led *led = container_of(work,
526                                               struct lp5523_led,
527                                               brightness_work);
528         struct lp5523_chip *chip = led_to_lp5523(led);
529         struct i2c_client *client = chip->client;
530
531         mutex_lock(&chip->lock);
532
533         lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
534                      led->brightness);
535
536         mutex_unlock(&chip->lock);
537 }
538
539 static int lp5523_do_store_load(struct lp5523_engine *engine,
540                                 const char *buf, size_t len)
541 {
542         struct lp5523_chip *chip = engine_to_lp5523(engine);
543         struct i2c_client *client = chip->client;
544         int  ret, nrchars, offset = 0, i = 0;
545         char c[3];
546         unsigned cmd;
547         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
548
549         while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
550                 /* separate sscanfs because length is working only for %s */
551                 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
552                 ret = sscanf(c, "%2x", &cmd);
553                 if (ret != 1)
554                         goto fail;
555                 pattern[i] = (u8)cmd;
556
557                 offset += nrchars;
558                 i++;
559         }
560
561         /* Each instruction is 16bit long. Check that length is even */
562         if (i % 2)
563                 goto fail;
564
565         mutex_lock(&chip->lock);
566
567         if (engine->mode == LP5523_CMD_LOAD)
568                 ret = lp5523_load_program(engine, pattern);
569         else
570                 ret = -EINVAL;
571
572         mutex_unlock(&chip->lock);
573
574         if (ret) {
575                 dev_err(&client->dev, "failed loading pattern\n");
576                 return ret;
577         }
578
579         return len;
580 fail:
581         dev_err(&client->dev, "wrong pattern format\n");
582         return -EINVAL;
583 }
584
585 static ssize_t store_engine_load(struct device *dev,
586                                      struct device_attribute *attr,
587                                      const char *buf, size_t len, int nr)
588 {
589         struct i2c_client *client = to_i2c_client(dev);
590         struct lp5523_chip *chip = i2c_get_clientdata(client);
591         return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
592 }
593
594 #define store_load(nr)                                                  \
595 static ssize_t store_engine##nr##_load(struct device *dev,              \
596                                      struct device_attribute *attr,     \
597                                      const char *buf, size_t len)       \
598 {                                                                       \
599         return store_engine_load(dev, attr, buf, len, nr);              \
600 }
601 store_load(1)
602 store_load(2)
603 store_load(3)
604
605 static ssize_t show_engine_mode(struct device *dev,
606                                 struct device_attribute *attr,
607                                 char *buf, int nr)
608 {
609         struct i2c_client *client = to_i2c_client(dev);
610         struct lp5523_chip *chip = i2c_get_clientdata(client);
611         switch (chip->engines[nr - 1].mode) {
612         case LP5523_CMD_RUN:
613                 return sprintf(buf, "run\n");
614         case LP5523_CMD_LOAD:
615                 return sprintf(buf, "load\n");
616         case LP5523_CMD_DISABLED:
617                 return sprintf(buf, "disabled\n");
618         default:
619                 return sprintf(buf, "disabled\n");
620         }
621 }
622
623 #define show_mode(nr)                                                   \
624 static ssize_t show_engine##nr##_mode(struct device *dev,               \
625                                     struct device_attribute *attr,      \
626                                     char *buf)                          \
627 {                                                                       \
628         return show_engine_mode(dev, attr, buf, nr);                    \
629 }
630 show_mode(1)
631 show_mode(2)
632 show_mode(3)
633
634 static ssize_t store_engine_mode(struct device *dev,
635                                  struct device_attribute *attr,
636                                  const char *buf, size_t len, int nr)
637 {
638         struct i2c_client *client = to_i2c_client(dev);
639         struct lp5523_chip *chip = i2c_get_clientdata(client);
640         struct lp5523_engine *engine = &chip->engines[nr - 1];
641         mutex_lock(&chip->lock);
642
643         if (!strncmp(buf, "run", 3))
644                 lp5523_set_mode(engine, LP5523_CMD_RUN);
645         else if (!strncmp(buf, "load", 4))
646                 lp5523_set_mode(engine, LP5523_CMD_LOAD);
647         else if (!strncmp(buf, "disabled", 8))
648                 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
649
650         mutex_unlock(&chip->lock);
651         return len;
652 }
653
654 #define store_mode(nr)                                                  \
655 static ssize_t store_engine##nr##_mode(struct device *dev,              \
656                                      struct device_attribute *attr,     \
657                                      const char *buf, size_t len)       \
658 {                                                                       \
659         return store_engine_mode(dev, attr, buf, len, nr);              \
660 }
661 store_mode(1)
662 store_mode(2)
663 store_mode(3)
664
665 static ssize_t show_max_current(struct device *dev,
666                             struct device_attribute *attr,
667                             char *buf)
668 {
669         struct led_classdev *led_cdev = dev_get_drvdata(dev);
670         struct lp5523_led *led = cdev_to_led(led_cdev);
671
672         return sprintf(buf, "%d\n", led->max_current);
673 }
674
675 static ssize_t show_current(struct device *dev,
676                             struct device_attribute *attr,
677                             char *buf)
678 {
679         struct led_classdev *led_cdev = dev_get_drvdata(dev);
680         struct lp5523_led *led = cdev_to_led(led_cdev);
681
682         return sprintf(buf, "%d\n", led->led_current);
683 }
684
685 static ssize_t store_current(struct device *dev,
686                              struct device_attribute *attr,
687                              const char *buf, size_t len)
688 {
689         struct led_classdev *led_cdev = dev_get_drvdata(dev);
690         struct lp5523_led *led = cdev_to_led(led_cdev);
691         struct lp5523_chip *chip = led_to_lp5523(led);
692         ssize_t ret;
693         unsigned long curr;
694
695         if (strict_strtoul(buf, 0, &curr))
696                 return -EINVAL;
697
698         if (curr > led->max_current)
699                 return -EINVAL;
700
701         mutex_lock(&chip->lock);
702         ret = lp5523_write(chip->client,
703                         LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
704                         (u8)curr);
705         mutex_unlock(&chip->lock);
706
707         if (ret < 0)
708                 return ret;
709
710         led->led_current = (u8)curr;
711
712         return len;
713 }
714
715 /* led class device attributes */
716 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
717 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
718
719 static struct attribute *lp5523_led_attributes[] = {
720         &dev_attr_led_current.attr,
721         &dev_attr_max_current.attr,
722         NULL,
723 };
724
725 static struct attribute_group lp5523_led_attribute_group = {
726         .attrs = lp5523_led_attributes
727 };
728
729 /* device attributes */
730 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
731                    show_engine1_mode, store_engine1_mode);
732 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
733                    show_engine2_mode, store_engine2_mode);
734 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
735                    show_engine3_mode, store_engine3_mode);
736 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO,
737                    show_engine1_leds, store_engine1_leds);
738 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO,
739                    show_engine2_leds, store_engine2_leds);
740 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO,
741                    show_engine3_leds, store_engine3_leds);
742 static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
743 static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
744 static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
745 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
746
747 static struct attribute *lp5523_attributes[] = {
748         &dev_attr_engine1_mode.attr,
749         &dev_attr_engine2_mode.attr,
750         &dev_attr_engine3_mode.attr,
751         &dev_attr_selftest.attr,
752         &dev_attr_engine1_load.attr,
753         &dev_attr_engine1_leds.attr,
754         &dev_attr_engine2_load.attr,
755         &dev_attr_engine2_leds.attr,
756         &dev_attr_engine3_load.attr,
757         &dev_attr_engine3_leds.attr,
758 };
759
760 static const struct attribute_group lp5523_group = {
761         .attrs = lp5523_attributes,
762 };
763
764 static int lp5523_register_sysfs(struct i2c_client *client)
765 {
766         struct device *dev = &client->dev;
767         int ret;
768
769         ret = sysfs_create_group(&dev->kobj, &lp5523_group);
770         if (ret < 0)
771                 return ret;
772
773         return 0;
774 }
775
776 static void lp5523_unregister_sysfs(struct i2c_client *client)
777 {
778         struct lp5523_chip *chip = i2c_get_clientdata(client);
779         struct device *dev = &client->dev;
780         int i;
781
782         sysfs_remove_group(&dev->kobj, &lp5523_group);
783
784         for (i = 0; i < chip->num_leds; i++)
785                 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
786                                 &lp5523_led_attribute_group);
787 }
788
789 /*--------------------------------------------------------------*/
790 /*                      Set chip operating mode                 */
791 /*--------------------------------------------------------------*/
792 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
793 {
794         int ret = 0;
795
796         /* if in that mode already do nothing, except for run */
797         if (mode == engine->mode && mode != LP5523_CMD_RUN)
798                 return 0;
799
800         if (mode == LP5523_CMD_RUN) {
801                 ret = lp5523_run_program(engine);
802         } else if (mode == LP5523_CMD_LOAD) {
803                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
804                 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
805         } else if (mode == LP5523_CMD_DISABLED) {
806                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
807         }
808
809         engine->mode = mode;
810
811         return ret;
812 }
813
814 /*--------------------------------------------------------------*/
815 /*                      Probe, Attach, Remove                   */
816 /*--------------------------------------------------------------*/
817 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
818 {
819         if (id < 1 || id > LP5523_ENGINES)
820                 return -1;
821         engine->id = id;
822         engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
823         engine->prog_page = id - 1;
824         engine->mux_page = id + 2;
825
826         return 0;
827 }
828
829 static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev,
830                            int chan, struct lp5523_platform_data *pdata)
831 {
832         char name[32];
833         int res;
834
835         if (chan >= LP5523_LEDS)
836                 return -EINVAL;
837
838         if (pdata->led_config[chan].led_current) {
839                 led->led_current = pdata->led_config[chan].led_current;
840                 led->max_current = pdata->led_config[chan].max_current;
841                 led->chan_nr = pdata->led_config[chan].chan_nr;
842
843                 if (led->chan_nr >= LP5523_LEDS) {
844                         dev_err(dev, "Use channel numbers between 0 and %d\n",
845                                 LP5523_LEDS - 1);
846                         return -EINVAL;
847                 }
848
849                 snprintf(name, sizeof(name), "%s:channel%d",
850                         pdata->label ?: "lp5523", chan);
851
852                 led->cdev.name = name;
853                 led->cdev.brightness_set = lp5523_set_brightness;
854                 res = led_classdev_register(dev, &led->cdev);
855                 if (res < 0) {
856                         dev_err(dev, "couldn't register led on channel %d\n",
857                                 chan);
858                         return res;
859                 }
860                 res = sysfs_create_group(&led->cdev.dev->kobj,
861                                 &lp5523_led_attribute_group);
862                 if (res < 0) {
863                         dev_err(dev, "couldn't register current attribute\n");
864                         led_classdev_unregister(&led->cdev);
865                         return res;
866                 }
867         } else {
868                 led->led_current = 0;
869         }
870         return 0;
871 }
872
873 static struct i2c_driver lp5523_driver;
874
875 static int lp5523_probe(struct i2c_client *client,
876                         const struct i2c_device_id *id)
877 {
878         struct lp5523_chip              *chip;
879         struct lp5523_platform_data     *pdata;
880         int ret, i, led;
881
882         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
883         if (!chip)
884                 return -ENOMEM;
885
886         i2c_set_clientdata(client, chip);
887         chip->client = client;
888
889         pdata = client->dev.platform_data;
890
891         if (!pdata) {
892                 dev_err(&client->dev, "no platform data\n");
893                 ret = -EINVAL;
894                 goto fail1;
895         }
896
897         mutex_init(&chip->lock);
898
899         chip->pdata   = pdata;
900
901         if (pdata->setup_resources) {
902                 ret = pdata->setup_resources();
903                 if (ret < 0)
904                         goto fail1;
905         }
906
907         if (pdata->enable) {
908                 pdata->enable(0);
909                 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
910                 pdata->enable(1);
911                 usleep_range(1000, 2000); /* 500us abs min. */
912         }
913
914         lp5523_write(client, LP5523_REG_RESET, 0xff);
915         usleep_range(10000, 20000); /*
916                                      * Exact value is not available. 10 - 20ms
917                                      * appears to be enough for reset.
918                                      */
919         ret = lp5523_detect(client);
920         if (ret)
921                 goto fail2;
922
923         dev_info(&client->dev, "LP5523 Programmable led chip found\n");
924
925         /* Initialize engines */
926         for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
927                 ret = lp5523_init_engine(&chip->engines[i], i + 1);
928                 if (ret) {
929                         dev_err(&client->dev, "error initializing engine\n");
930                         goto fail2;
931                 }
932         }
933         ret = lp5523_configure(client);
934         if (ret < 0) {
935                 dev_err(&client->dev, "error configuring chip\n");
936                 goto fail2;
937         }
938
939         /* Initialize leds */
940         chip->num_channels = pdata->num_channels;
941         chip->num_leds = 0;
942         led = 0;
943         for (i = 0; i < pdata->num_channels; i++) {
944                 /* Do not initialize channels that are not connected */
945                 if (pdata->led_config[i].led_current == 0)
946                         continue;
947
948                 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
949                 if (ret) {
950                         dev_err(&client->dev, "error initializing leds\n");
951                         goto fail3;
952                 }
953                 chip->num_leds++;
954
955                 chip->leds[led].id = led;
956                 /* Set LED current */
957                 lp5523_write(client,
958                           LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
959                           chip->leds[led].led_current);
960
961                 INIT_WORK(&(chip->leds[led].brightness_work),
962                         lp5523_led_brightness_work);
963
964                 led++;
965         }
966
967         ret = lp5523_register_sysfs(client);
968         if (ret) {
969                 dev_err(&client->dev, "registering sysfs failed\n");
970                 goto fail3;
971         }
972         return ret;
973 fail3:
974         for (i = 0; i < chip->num_leds; i++) {
975                 led_classdev_unregister(&chip->leds[i].cdev);
976                 cancel_work_sync(&chip->leds[i].brightness_work);
977         }
978 fail2:
979         if (pdata->enable)
980                 pdata->enable(0);
981         if (pdata->release_resources)
982                 pdata->release_resources();
983 fail1:
984         kfree(chip);
985         return ret;
986 }
987
988 static int lp5523_remove(struct i2c_client *client)
989 {
990         struct lp5523_chip *chip = i2c_get_clientdata(client);
991         int i;
992
993         lp5523_unregister_sysfs(client);
994
995         for (i = 0; i < chip->num_leds; i++) {
996                 led_classdev_unregister(&chip->leds[i].cdev);
997                 cancel_work_sync(&chip->leds[i].brightness_work);
998         }
999
1000         if (chip->pdata->enable)
1001                 chip->pdata->enable(0);
1002         if (chip->pdata->release_resources)
1003                 chip->pdata->release_resources();
1004         kfree(chip);
1005         return 0;
1006 }
1007
1008 static const struct i2c_device_id lp5523_id[] = {
1009         { "lp5523", 0 },
1010         { }
1011 };
1012
1013 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1014
1015 static struct i2c_driver lp5523_driver = {
1016         .driver = {
1017                 .name   = "lp5523",
1018         },
1019         .probe          = lp5523_probe,
1020         .remove         = lp5523_remove,
1021         .id_table       = lp5523_id,
1022 };
1023
1024 static int __init lp5523_init(void)
1025 {
1026         int ret;
1027
1028         ret = i2c_add_driver(&lp5523_driver);
1029
1030         if (ret < 0)
1031                 printk(KERN_ALERT "Adding lp5523 driver failed\n");
1032
1033         return ret;
1034 }
1035
1036 static void __exit lp5523_exit(void)
1037 {
1038         i2c_del_driver(&lp5523_driver);
1039 }
1040
1041 module_init(lp5523_init);
1042 module_exit(lp5523_exit);
1043
1044 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1045 MODULE_DESCRIPTION("LP5523 LED engine");
1046 MODULE_LICENSE("GPL");