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leds: driver for National Semiconductors LP5523 chip
[~shefty/rdma-dev.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         const struct attribute_group *attributes;
109         int             id;
110         u8              mode;
111         u8              prog_page;
112         u8              mux_page;
113         u16             led_mux;
114         u8              engine_mask;
115 };
116
117 struct lp5523_led {
118         int                     id;
119         u8                      chan_nr;
120         u8                      led_current;
121         u8                      max_current;
122         struct led_classdev     cdev;
123         struct work_struct      brightness_work;
124         u8                      brightness;
125 };
126
127 struct lp5523_chip {
128         struct mutex            lock; /* Serialize control */
129         struct i2c_client       *client;
130         struct lp5523_engine    engines[LP5523_ENGINES];
131         struct lp5523_led       leds[LP5523_LEDS];
132         struct lp5523_platform_data *pdata;
133         u8                      num_channels;
134         u8                      num_leds;
135 };
136
137 #define cdev_to_led(c)          container_of(c, struct lp5523_led, cdev)
138
139 static struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
140 {
141         return container_of(engine, struct lp5523_chip,
142                             engines[engine->id - 1]);
143 }
144
145 static struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
146 {
147         return container_of(led, struct lp5523_chip,
148                             leds[led->id]);
149 }
150
151 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
152 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
153 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
154
155 static void lp5523_led_brightness_work(struct work_struct *work);
156
157 static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
158 {
159         return i2c_smbus_write_byte_data(client, reg, value);
160 }
161
162 static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
163 {
164         s32 ret = i2c_smbus_read_byte_data(client, reg);
165
166         if (ret < 0)
167                 return -EIO;
168
169         *buf = ret;
170         return 0;
171 }
172
173 static int lp5523_detect(struct i2c_client *client)
174 {
175         int ret;
176         u8 buf;
177
178         ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40);
179         if (ret)
180                 return ret;
181         ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
182         if (ret)
183                 return ret;
184         if (buf == 0x40)
185                 return 0;
186         else
187                 return -ENODEV;
188 }
189
190 static int lp5523_configure(struct i2c_client *client)
191 {
192         struct lp5523_chip *chip = i2c_get_clientdata(client);
193         int ret = 0;
194         u8 status;
195
196         /* one pattern per engine setting led mux start and stop addresses */
197         u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
198                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
199                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
200                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
201         };
202
203         lp5523_write(client, LP5523_REG_RESET, 0xff);
204
205         usleep_range(10000, 100000);
206
207         ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
208         /* Chip startup time after reset is 500 us */
209         usleep_range(1000, 10000);
210
211         ret |= lp5523_write(client, LP5523_REG_CONFIG,
212                             LP5523_AUTO_INC | LP5523_PWR_SAVE |
213                             LP5523_CP_AUTO | LP5523_AUTO_CLK |
214                             LP5523_PWM_PWR_SAVE);
215
216         /* turn on all leds */
217         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
218         ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
219
220         /* hardcode 32 bytes of memory for each engine from program memory */
221         ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
222         ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
223         ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
224
225         /* write led mux address space for each channel */
226         ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
227         ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
228         ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
229
230         if (ret) {
231                 dev_err(&client->dev, "could not load mux programs\n");
232                 return -1;
233         }
234
235         /* set all engines exec state and mode to run 00101010 */
236         ret |= lp5523_write(client, LP5523_REG_ENABLE,
237                             (LP5523_CMD_RUN | LP5523_ENABLE));
238
239         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
240
241         if (ret) {
242                 dev_err(&client->dev, "could not start mux programs\n");
243                 return -1;
244         }
245
246         /* Wait 3ms and check the engine status */
247         usleep_range(3000, 20000);
248         lp5523_read(client, LP5523_REG_STATUS, &status);
249         status &= LP5523_ENG_STATUS_MASK;
250
251         if (status == LP5523_ENG_STATUS_MASK) {
252                 dev_dbg(&client->dev, "all engines configured\n");
253         } else {
254                 dev_info(&client->dev, "status == %x\n", status);
255                 dev_err(&client->dev, "cound not configure LED engine\n");
256                 return -1;
257         }
258
259         dev_info(&client->dev, "disabling engines\n");
260
261         ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
262
263         return ret;
264 }
265
266 static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
267 {
268         struct lp5523_chip *chip = engine_to_lp5523(engine);
269         struct i2c_client *client = chip->client;
270         int ret;
271         u8 engine_state;
272
273         ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
274         if (ret)
275                 goto fail;
276
277         engine_state &= ~(engine->engine_mask);
278
279         /* set mode only for this engine */
280         mode &= engine->engine_mask;
281
282         engine_state |= mode;
283
284         ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
285 fail:
286         return ret;
287 }
288
289 static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
290 {
291         struct lp5523_chip *chip = engine_to_lp5523(engine);
292         struct i2c_client *client = chip->client;
293         int ret = 0;
294
295         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
296
297         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
298         ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
299                             (u8)(mux >> 8));
300         ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
301         engine->led_mux = mux;
302
303         return ret;
304 }
305
306 static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern)
307 {
308         struct lp5523_chip *chip = engine_to_lp5523(engine);
309         struct i2c_client *client = chip->client;
310
311         int ret = 0;
312
313         ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
314
315         ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
316                             engine->prog_page);
317         ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
318                                               LP5523_PROGRAM_LENGTH, pattern);
319
320         return ret;
321 }
322
323 static int lp5523_run_program(struct lp5523_engine *engine)
324 {
325         struct lp5523_chip *chip = engine_to_lp5523(engine);
326         struct i2c_client *client = chip->client;
327         int ret;
328
329         ret = lp5523_write(client, LP5523_REG_ENABLE,
330                                         LP5523_CMD_RUN | LP5523_ENABLE);
331         if (ret)
332                 goto fail;
333
334         ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
335 fail:
336         return ret;
337 }
338
339 static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
340 {
341         int i;
342         u16 tmp_mux = 0;
343         len = len < LP5523_LEDS ? len : LP5523_LEDS;
344         for (i = 0; i < len; i++) {
345                 switch (buf[i]) {
346                 case '1':
347                         tmp_mux |= (1 << i);
348                         break;
349                 case '0':
350                         break;
351                 case '\n':
352                         i = len;
353                         break;
354                 default:
355                         return -1;
356                 }
357         }
358         *mux = tmp_mux;
359
360         return 0;
361 }
362
363 static void lp5523_mux_to_array(u16 led_mux, char *array)
364 {
365         int i, pos = 0;
366         for (i = 0; i < LP5523_LEDS; i++)
367                 pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
368
369         array[pos] = '\0';
370 }
371
372 /*--------------------------------------------------------------*/
373 /*                      Sysfs interface                         */
374 /*--------------------------------------------------------------*/
375
376 static ssize_t show_engine_leds(struct device *dev,
377                             struct device_attribute *attr,
378                             char *buf, int nr)
379 {
380         struct i2c_client *client = to_i2c_client(dev);
381         struct lp5523_chip *chip = i2c_get_clientdata(client);
382         char mux[LP5523_LEDS + 1];
383
384         lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
385
386         return sprintf(buf, "%s\n", mux);
387 }
388
389 #define show_leds(nr)                                                   \
390 static ssize_t show_engine##nr##_leds(struct device *dev,               \
391                             struct device_attribute *attr,              \
392                             char *buf)                                  \
393 {                                                                       \
394         return show_engine_leds(dev, attr, buf, nr);                    \
395 }
396 show_leds(1)
397 show_leds(2)
398 show_leds(3)
399
400 static ssize_t store_engine_leds(struct device *dev,
401                              struct device_attribute *attr,
402                              const char *buf, size_t len, int nr)
403 {
404         struct i2c_client *client = to_i2c_client(dev);
405         struct lp5523_chip *chip = i2c_get_clientdata(client);
406         u16 mux = 0;
407
408         if (lp5523_mux_parse(buf, &mux, len))
409                 return -EINVAL;
410
411         if (lp5523_load_mux(&chip->engines[nr - 1], mux))
412                 return -EINVAL;
413
414         return len;
415 }
416
417 #define store_leds(nr)                                          \
418 static ssize_t store_engine##nr##_leds(struct device *dev,      \
419                              struct device_attribute *attr,     \
420                              const char *buf, size_t len)       \
421 {                                                               \
422         return store_engine_leds(dev, attr, buf, len, nr);      \
423 }
424 store_leds(1)
425 store_leds(2)
426 store_leds(3)
427
428 static ssize_t lp5523_selftest(struct device *dev,
429                                struct device_attribute *attr,
430                                char *buf)
431 {
432         struct i2c_client *client = to_i2c_client(dev);
433         struct lp5523_chip *chip = i2c_get_clientdata(client);
434         int i, ret, pos = 0;
435         int led = 0;
436         u8 status, adc, vdd;
437
438         mutex_lock(&chip->lock);
439
440         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
441         if (ret < 0)
442                 goto fail;
443
444         /* Check that ext clock is really in use if requested */
445         if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
446                 if  ((status & LP5523_EXT_CLK_USED) == 0)
447                         goto fail;
448
449         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
450         lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
451                                     LP5523_EN_LEDTEST | 16);
452         usleep_range(3000, 10000);
453         ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
454         if (!(status & LP5523_LEDTEST_DONE))
455                 usleep_range(3000, 10000);
456
457         ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
458         vdd--;  /* There may be some fluctuation in measurement */
459
460         for (i = 0; i < LP5523_LEDS; i++) {
461                 /* Skip non-existing channels */
462                 if (chip->pdata->led_config[i].led_current == 0)
463                         continue;
464
465                 /* Set default current */
466                 lp5523_write(chip->client,
467                         LP5523_REG_LED_CURRENT_BASE + i,
468                         chip->pdata->led_config[i].led_current);
469
470                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
471                 /* let current stabilize 2ms before measurements start */
472                 usleep_range(2000, 10000);
473                 lp5523_write(chip->client,
474                              LP5523_REG_LED_TEST_CTRL,
475                              LP5523_EN_LEDTEST | i);
476                 /* ledtest takes 2.7ms */
477                 usleep_range(3000, 10000);
478                 ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
479                 if (!(status & LP5523_LEDTEST_DONE))
480                         usleep_range(3000, 10000);
481                 ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
482
483                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
484                         pos += sprintf(buf + pos, "LED %d FAIL\n", i);
485
486                 lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
487
488                 /* Restore current */
489                 lp5523_write(chip->client,
490                         LP5523_REG_LED_CURRENT_BASE + i,
491                         chip->leds[led].led_current);
492                 led++;
493         }
494         if (pos == 0)
495                 pos = sprintf(buf, "OK\n");
496         goto release_lock;
497 fail:
498         pos = sprintf(buf, "FAIL\n");
499
500 release_lock:
501         mutex_unlock(&chip->lock);
502
503         return pos;
504 }
505
506 static void lp5523_set_brightness(struct led_classdev *cdev,
507                              enum led_brightness brightness)
508 {
509         struct lp5523_led *led = cdev_to_led(cdev);
510
511         led->brightness = (u8)brightness;
512
513         schedule_work(&led->brightness_work);
514 }
515
516 static void lp5523_led_brightness_work(struct work_struct *work)
517 {
518         struct lp5523_led *led = container_of(work,
519                                               struct lp5523_led,
520                                               brightness_work);
521         struct lp5523_chip *chip = led_to_lp5523(led);
522         struct i2c_client *client = chip->client;
523
524         mutex_lock(&chip->lock);
525
526         lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
527                      led->brightness);
528
529         mutex_unlock(&chip->lock);
530 }
531
532 static int lp5523_do_store_load(struct lp5523_engine *engine,
533                                 const char *buf, size_t len)
534 {
535         struct lp5523_chip *chip = engine_to_lp5523(engine);
536         struct i2c_client *client = chip->client;
537         int  ret, nrchars, offset = 0, i = 0;
538         char c[3];
539         unsigned cmd;
540         u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
541
542         while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
543                 /* separate sscanfs because length is working only for %s */
544                 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
545                 ret = sscanf(c, "%2x", &cmd);
546                 if (ret != 1)
547                         goto fail;
548                 pattern[i] = (u8)cmd;
549
550                 offset += nrchars;
551                 i++;
552         }
553
554         /* Each instruction is 16bit long. Check that length is even */
555         if (i % 2)
556                 goto fail;
557
558         mutex_lock(&chip->lock);
559
560         ret = lp5523_load_program(engine, pattern);
561         mutex_unlock(&chip->lock);
562
563         if (ret) {
564                 dev_err(&client->dev, "failed loading pattern\n");
565                 return ret;
566         }
567
568         return len;
569 fail:
570         dev_err(&client->dev, "wrong pattern format\n");
571         return -EINVAL;
572 }
573
574 static ssize_t store_engine_load(struct device *dev,
575                                      struct device_attribute *attr,
576                                      const char *buf, size_t len, int nr)
577 {
578         struct i2c_client *client = to_i2c_client(dev);
579         struct lp5523_chip *chip = i2c_get_clientdata(client);
580         return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
581 }
582
583 #define store_load(nr)                                                  \
584 static ssize_t store_engine##nr##_load(struct device *dev,              \
585                                      struct device_attribute *attr,     \
586                                      const char *buf, size_t len)       \
587 {                                                                       \
588         return store_engine_load(dev, attr, buf, len, nr);              \
589 }
590 store_load(1)
591 store_load(2)
592 store_load(3)
593
594 static ssize_t show_engine_mode(struct device *dev,
595                                 struct device_attribute *attr,
596                                 char *buf, int nr)
597 {
598         struct i2c_client *client = to_i2c_client(dev);
599         struct lp5523_chip *chip = i2c_get_clientdata(client);
600         switch (chip->engines[nr - 1].mode) {
601         case LP5523_CMD_RUN:
602                 return sprintf(buf, "run\n");
603         case LP5523_CMD_LOAD:
604                 return sprintf(buf, "load\n");
605         case LP5523_CMD_DISABLED:
606                 return sprintf(buf, "disabled\n");
607         default:
608                 return sprintf(buf, "disabled\n");
609         }
610 }
611
612 #define show_mode(nr)                                                   \
613 static ssize_t show_engine##nr##_mode(struct device *dev,               \
614                                     struct device_attribute *attr,      \
615                                     char *buf)                          \
616 {                                                                       \
617         return show_engine_mode(dev, attr, buf, nr);                    \
618 }
619 show_mode(1)
620 show_mode(2)
621 show_mode(3)
622
623 static ssize_t store_engine_mode(struct device *dev,
624                                  struct device_attribute *attr,
625                                  const char *buf, size_t len, int nr)
626 {
627         struct i2c_client *client = to_i2c_client(dev);
628         struct lp5523_chip *chip = i2c_get_clientdata(client);
629         struct lp5523_engine *engine = &chip->engines[nr - 1];
630         mutex_lock(&chip->lock);
631
632         if (!strncmp(buf, "run", 3))
633                 lp5523_set_mode(engine, LP5523_CMD_RUN);
634         else if (!strncmp(buf, "load", 4))
635                 lp5523_set_mode(engine, LP5523_CMD_LOAD);
636         else if (!strncmp(buf, "disabled", 8))
637                 lp5523_set_mode(engine, LP5523_CMD_DISABLED);
638
639         mutex_unlock(&chip->lock);
640         return len;
641 }
642
643 #define store_mode(nr)                                                  \
644 static ssize_t store_engine##nr##_mode(struct device *dev,              \
645                                      struct device_attribute *attr,     \
646                                      const char *buf, size_t len)       \
647 {                                                                       \
648         return store_engine_mode(dev, attr, buf, len, nr);              \
649 }
650 store_mode(1)
651 store_mode(2)
652 store_mode(3)
653
654 static ssize_t show_max_current(struct device *dev,
655                             struct device_attribute *attr,
656                             char *buf)
657 {
658         struct led_classdev *led_cdev = dev_get_drvdata(dev);
659         struct lp5523_led *led = cdev_to_led(led_cdev);
660
661         return sprintf(buf, "%d\n", led->max_current);
662 }
663
664 static ssize_t show_current(struct device *dev,
665                             struct device_attribute *attr,
666                             char *buf)
667 {
668         struct led_classdev *led_cdev = dev_get_drvdata(dev);
669         struct lp5523_led *led = cdev_to_led(led_cdev);
670
671         return sprintf(buf, "%d\n", led->led_current);
672 }
673
674 static ssize_t store_current(struct device *dev,
675                              struct device_attribute *attr,
676                              const char *buf, size_t len)
677 {
678         struct led_classdev *led_cdev = dev_get_drvdata(dev);
679         struct lp5523_led *led = cdev_to_led(led_cdev);
680         struct lp5523_chip *chip = led_to_lp5523(led);
681         ssize_t ret;
682         unsigned long curr;
683
684         if (strict_strtoul(buf, 0, &curr))
685                 return -EINVAL;
686
687         if (curr > led->max_current)
688                 return -EINVAL;
689
690         mutex_lock(&chip->lock);
691         ret = lp5523_write(chip->client,
692                         LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
693                         (u8)curr);
694         mutex_unlock(&chip->lock);
695
696         if (ret < 0)
697                 return ret;
698
699         led->led_current = (u8)curr;
700
701         return len;
702 }
703
704 /* led class device attributes */
705 static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
706 static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
707
708 static struct attribute *lp5523_led_attributes[] = {
709         &dev_attr_led_current.attr,
710         &dev_attr_max_current.attr,
711         NULL,
712 };
713
714 static struct attribute_group lp5523_led_attribute_group = {
715         .attrs = lp5523_led_attributes
716 };
717
718 /* device attributes */
719 static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
720                    show_engine1_mode, store_engine1_mode);
721 static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
722                    show_engine2_mode, store_engine2_mode);
723 static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
724                    show_engine3_mode, store_engine3_mode);
725 static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO,
726                    show_engine1_leds, store_engine1_leds);
727 static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO,
728                    show_engine2_leds, store_engine2_leds);
729 static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO,
730                    show_engine3_leds, store_engine3_leds);
731 static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
732 static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
733 static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
734 static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
735
736 static struct attribute *lp5523_attributes[] = {
737         &dev_attr_engine1_mode.attr,
738         &dev_attr_engine2_mode.attr,
739         &dev_attr_engine3_mode.attr,
740         &dev_attr_selftest.attr,
741         NULL
742 };
743
744 static struct attribute *lp5523_engine1_attributes[] = {
745         &dev_attr_engine1_load.attr,
746         &dev_attr_engine1_leds.attr,
747         NULL
748 };
749
750 static struct attribute *lp5523_engine2_attributes[] = {
751         &dev_attr_engine2_load.attr,
752         &dev_attr_engine2_leds.attr,
753         NULL
754 };
755
756 static struct attribute *lp5523_engine3_attributes[] = {
757         &dev_attr_engine3_load.attr,
758         &dev_attr_engine3_leds.attr,
759         NULL
760 };
761
762 static const struct attribute_group lp5523_group = {
763         .attrs = lp5523_attributes,
764 };
765
766 static const struct attribute_group lp5523_engine_group[] = {
767         {.attrs = lp5523_engine1_attributes },
768         {.attrs = lp5523_engine2_attributes },
769         {.attrs = lp5523_engine3_attributes },
770 };
771
772 static int lp5523_register_sysfs(struct i2c_client *client)
773 {
774         struct device *dev = &client->dev;
775         int ret;
776
777         ret = sysfs_create_group(&dev->kobj, &lp5523_group);
778         if (ret < 0)
779                 return ret;
780
781         return 0;
782 }
783
784 static void lp5523_unregister_sysfs(struct i2c_client *client)
785 {
786         struct lp5523_chip *chip = i2c_get_clientdata(client);
787         struct device *dev = &client->dev;
788         int i;
789
790         sysfs_remove_group(&dev->kobj, &lp5523_group);
791
792         for (i = 0; i < ARRAY_SIZE(chip->engines); i++)
793                 if (chip->engines[i].mode == LP5523_CMD_LOAD)
794                         sysfs_remove_group(&dev->kobj, &lp5523_engine_group[i]);
795
796         for (i = 0; i < chip->num_leds; i++)
797                 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
798                                 &lp5523_led_attribute_group);
799 }
800
801 /*--------------------------------------------------------------*/
802 /*                      Set chip operating mode                 */
803 /*--------------------------------------------------------------*/
804 static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
805 {
806         /*  engine to chip */
807         struct lp5523_chip *chip = engine_to_lp5523(engine);
808         struct i2c_client *client = chip->client;
809         struct device *dev = &client->dev;
810         int ret = 0;
811
812         /* if in that mode already do nothing, except for run */
813         if (mode == engine->mode && mode != LP5523_CMD_RUN)
814                 return 0;
815
816         if (mode == LP5523_CMD_RUN) {
817                 ret = lp5523_run_program(engine);
818         } else if (mode == LP5523_CMD_LOAD) {
819                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
820                 lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
821
822                 ret = sysfs_create_group(&dev->kobj, engine->attributes);
823                 if (ret)
824                         return ret;
825         } else if (mode == LP5523_CMD_DISABLED) {
826                 lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
827         }
828
829         /* remove load attribute from sysfs if not in load mode */
830         if (engine->mode == LP5523_CMD_LOAD && mode != LP5523_CMD_LOAD)
831                 sysfs_remove_group(&dev->kobj, engine->attributes);
832
833         engine->mode = mode;
834
835         return ret;
836 }
837
838 /*--------------------------------------------------------------*/
839 /*                      Probe, Attach, Remove                   */
840 /*--------------------------------------------------------------*/
841 static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
842 {
843         if (id < 1 || id > LP5523_ENGINES)
844                 return -1;
845         engine->id = id;
846         engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
847         engine->prog_page = id - 1;
848         engine->mux_page = id + 2;
849         engine->attributes = &lp5523_engine_group[id - 1];
850
851         return 0;
852 }
853
854 static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev,
855                            int chan, struct lp5523_platform_data *pdata)
856 {
857         char name[32];
858         int res;
859
860         if (chan >= LP5523_LEDS)
861                 return -EINVAL;
862
863         if (pdata->led_config[chan].led_current) {
864                 led->led_current = pdata->led_config[chan].led_current;
865                 led->max_current = pdata->led_config[chan].max_current;
866                 led->chan_nr = pdata->led_config[chan].chan_nr;
867
868                 if (led->chan_nr >= LP5523_LEDS) {
869                         dev_err(dev, "Use channel numbers between 0 and %d\n",
870                                 LP5523_LEDS - 1);
871                         return -EINVAL;
872                 }
873
874                 snprintf(name, 32, "lp5523:channel%d", chan);
875
876                 led->cdev.name = name;
877                 led->cdev.brightness_set = lp5523_set_brightness;
878                 res = led_classdev_register(dev, &led->cdev);
879                 if (res < 0) {
880                         dev_err(dev, "couldn't register led on channel %d\n",
881                                 chan);
882                         return res;
883                 }
884                 res = sysfs_create_group(&led->cdev.dev->kobj,
885                                 &lp5523_led_attribute_group);
886                 if (res < 0) {
887                         dev_err(dev, "couldn't register current attribute\n");
888                         led_classdev_unregister(&led->cdev);
889                         return res;
890                 }
891         } else {
892                 led->led_current = 0;
893         }
894         return 0;
895 }
896
897 static struct i2c_driver lp5523_driver;
898
899 static int lp5523_probe(struct i2c_client *client,
900                         const struct i2c_device_id *id)
901 {
902         struct lp5523_chip              *chip;
903         struct lp5523_platform_data     *pdata;
904         int ret, i, led;
905
906         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
907         if (!chip)
908                 return -ENOMEM;
909
910         i2c_set_clientdata(client, chip);
911         chip->client = client;
912
913         pdata = client->dev.platform_data;
914
915         if (!pdata) {
916                 dev_err(&client->dev, "no platform data\n");
917                 ret = -EINVAL;
918                 goto fail1;
919         }
920
921         mutex_init(&chip->lock);
922
923         chip->pdata   = pdata;
924
925         if (pdata->setup_resources) {
926                 ret = pdata->setup_resources();
927                 if (ret < 0)
928                         goto fail1;
929         }
930
931         if (pdata->enable) {
932                 pdata->enable(0);
933                 usleep_range(1000, 10000);
934                 pdata->enable(1);
935                 usleep_range(1000, 10000); /* Spec says min 500us */
936         }
937
938         ret = lp5523_detect(client);
939         if (ret)
940                 goto fail2;
941
942         dev_info(&client->dev, "LP5523 Programmable led chip found\n");
943
944         /* Initialize engines */
945         for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
946                 ret = lp5523_init_engine(&chip->engines[i], i + 1);
947                 if (ret) {
948                         dev_err(&client->dev, "error initializing engine\n");
949                         goto fail2;
950                 }
951         }
952         ret = lp5523_configure(client);
953         if (ret < 0) {
954                 dev_err(&client->dev, "error configuring chip\n");
955                 goto fail2;
956         }
957
958         /* Initialize leds */
959         chip->num_channels = pdata->num_channels;
960         chip->num_leds = 0;
961         led = 0;
962         for (i = 0; i < pdata->num_channels; i++) {
963                 /* Do not initialize channels that are not connected */
964                 if (pdata->led_config[i].led_current == 0)
965                         continue;
966
967                 ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
968                 if (ret) {
969                         dev_err(&client->dev, "error initializing leds\n");
970                         goto fail3;
971                 }
972                 chip->num_leds++;
973
974                 chip->leds[led].id = led;
975                 /* Set LED current */
976                 lp5523_write(client,
977                           LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
978                           chip->leds[led].led_current);
979
980                 INIT_WORK(&(chip->leds[led].brightness_work),
981                         lp5523_led_brightness_work);
982
983                 led++;
984         }
985
986         ret = lp5523_register_sysfs(client);
987         if (ret) {
988                 dev_err(&client->dev, "registering sysfs failed\n");
989                 goto fail3;
990         }
991         return ret;
992 fail3:
993         for (i = 0; i < chip->num_leds; i++) {
994                 led_classdev_unregister(&chip->leds[i].cdev);
995                 cancel_work_sync(&chip->leds[i].brightness_work);
996         }
997 fail2:
998         if (pdata->enable)
999                 pdata->enable(0);
1000         if (pdata->release_resources)
1001                 pdata->release_resources();
1002 fail1:
1003         kfree(chip);
1004         return ret;
1005 }
1006
1007 static int lp5523_remove(struct i2c_client *client)
1008 {
1009         struct lp5523_chip *chip = i2c_get_clientdata(client);
1010         int i;
1011
1012         lp5523_unregister_sysfs(client);
1013
1014         for (i = 0; i < chip->num_leds; i++) {
1015                 led_classdev_unregister(&chip->leds[i].cdev);
1016                 cancel_work_sync(&chip->leds[i].brightness_work);
1017         }
1018
1019         if (chip->pdata->enable)
1020                 chip->pdata->enable(0);
1021         if (chip->pdata->release_resources)
1022                 chip->pdata->release_resources();
1023         kfree(chip);
1024         return 0;
1025 }
1026
1027 static const struct i2c_device_id lp5523_id[] = {
1028         { "lp5523", 0 },
1029         { }
1030 };
1031
1032 MODULE_DEVICE_TABLE(i2c, lp5523_id);
1033
1034 static struct i2c_driver lp5523_driver = {
1035         .driver = {
1036                 .name   = "lp5523",
1037         },
1038         .probe          = lp5523_probe,
1039         .remove         = lp5523_remove,
1040         .id_table       = lp5523_id,
1041 };
1042
1043 static int __init lp5523_init(void)
1044 {
1045         int ret;
1046
1047         ret = i2c_add_driver(&lp5523_driver);
1048
1049         if (ret < 0)
1050                 printk(KERN_ALERT "Adding lp5523 driver failed\n");
1051
1052         return ret;
1053 }
1054
1055 static void __exit lp5523_exit(void)
1056 {
1057         i2c_del_driver(&lp5523_driver);
1058 }
1059
1060 module_init(lp5523_init);
1061 module_exit(lp5523_exit);
1062
1063 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1064 MODULE_DESCRIPTION("LP5523 LED engine");
1065 MODULE_LICENSE("GPL");