Root/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
107struct 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
116struct 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
126struct 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
136static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
137{
138    return container_of(cdev, struct lp5523_led, cdev);
139}
140
141static 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
147static 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
153static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
154static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
155static int lp5523_load_program(struct lp5523_engine *engine, const u8 *pattern);
156
157static void lp5523_led_brightness_work(struct work_struct *work);
158
159static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
160{
161    return i2c_smbus_write_byte_data(client, reg, value);
162}
163
164static 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
175static 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
192static 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    static const 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
264static 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);
283fail:
284    return ret;
285}
286
287static 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
304static int lp5523_load_program(struct lp5523_engine *engine, const 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
321static 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);
333fail:
334    return ret;
335}
336
337static 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
361static 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
374static 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) \
388static 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}
394show_leds(1)
395show_leds(2)
396show_leds(3)
397
398static 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;
419leave:
420    mutex_unlock(&chip->lock);
421    return ret;
422}
423
424#define store_leds(nr) \
425static 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}
431store_leds(1)
432store_leds(2)
433store_leds(3)
434
435static 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;
504fail:
505    pos = sprintf(buf, "FAIL\n");
506
507release_lock:
508    mutex_unlock(&chip->lock);
509
510    return pos;
511}
512
513static 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
523static 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
539static 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;
580fail:
581    dev_err(&client->dev, "wrong pattern format\n");
582    return -EINVAL;
583}
584
585static 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) \
595static 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}
601store_load(1)
602store_load(2)
603store_load(3)
604
605static 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) \
624static 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}
630show_mode(1)
631show_mode(2)
632show_mode(3)
633
634static 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) \
655static 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}
661store_mode(1)
662store_mode(2)
663store_mode(3)
664
665static 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
675static 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
685static 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 */
716static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
717static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
718
719static struct attribute *lp5523_led_attributes[] = {
720    &dev_attr_led_current.attr,
721    &dev_attr_max_current.attr,
722    NULL,
723};
724
725static struct attribute_group lp5523_led_attribute_group = {
726    .attrs = lp5523_led_attributes
727};
728
729/* device attributes */
730static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
731           show_engine1_mode, store_engine1_mode);
732static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
733           show_engine2_mode, store_engine2_mode);
734static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
735           show_engine3_mode, store_engine3_mode);
736static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
737           show_engine1_leds, store_engine1_leds);
738static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
739           show_engine2_leds, store_engine2_leds);
740static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
741           show_engine3_leds, store_engine3_leds);
742static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
743static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
744static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
745static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
746
747static 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
760static const struct attribute_group lp5523_group = {
761    .attrs = lp5523_attributes,
762};
763
764static 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
776static 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/*--------------------------------------------------------------*/
792static 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/*--------------------------------------------------------------*/
817static 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
829static int __devinit 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
873static int __devinit lp5523_probe(struct i2c_client *client,
874            const struct i2c_device_id *id)
875{
876    struct lp5523_chip *chip;
877    struct lp5523_platform_data *pdata;
878    int ret, i, led;
879
880    chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
881    if (!chip)
882        return -ENOMEM;
883
884    i2c_set_clientdata(client, chip);
885    chip->client = client;
886
887    pdata = client->dev.platform_data;
888
889    if (!pdata) {
890        dev_err(&client->dev, "no platform data\n");
891        return -EINVAL;
892    }
893
894    mutex_init(&chip->lock);
895
896    chip->pdata = pdata;
897
898    if (pdata->setup_resources) {
899        ret = pdata->setup_resources();
900        if (ret < 0)
901            return ret;
902    }
903
904    if (pdata->enable) {
905        pdata->enable(0);
906        usleep_range(1000, 2000); /* Keep enable down at least 1ms */
907        pdata->enable(1);
908        usleep_range(1000, 2000); /* 500us abs min. */
909    }
910
911    lp5523_write(client, LP5523_REG_RESET, 0xff);
912    usleep_range(10000, 20000); /*
913                     * Exact value is not available. 10 - 20ms
914                     * appears to be enough for reset.
915                     */
916    ret = lp5523_detect(client);
917    if (ret)
918        goto fail1;
919
920    dev_info(&client->dev, "LP5523 Programmable led chip found\n");
921
922    /* Initialize engines */
923    for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
924        ret = lp5523_init_engine(&chip->engines[i], i + 1);
925        if (ret) {
926            dev_err(&client->dev, "error initializing engine\n");
927            goto fail1;
928        }
929    }
930    ret = lp5523_configure(client);
931    if (ret < 0) {
932        dev_err(&client->dev, "error configuring chip\n");
933        goto fail1;
934    }
935
936    /* Initialize leds */
937    chip->num_channels = pdata->num_channels;
938    chip->num_leds = 0;
939    led = 0;
940    for (i = 0; i < pdata->num_channels; i++) {
941        /* Do not initialize channels that are not connected */
942        if (pdata->led_config[i].led_current == 0)
943            continue;
944
945        INIT_WORK(&chip->leds[led].brightness_work,
946            lp5523_led_brightness_work);
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 fail2;
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        led++;
962    }
963
964    ret = lp5523_register_sysfs(client);
965    if (ret) {
966        dev_err(&client->dev, "registering sysfs failed\n");
967        goto fail2;
968    }
969    return ret;
970fail2:
971    for (i = 0; i < chip->num_leds; i++) {
972        led_classdev_unregister(&chip->leds[i].cdev);
973        cancel_work_sync(&chip->leds[i].brightness_work);
974    }
975fail1:
976    if (pdata->enable)
977        pdata->enable(0);
978    if (pdata->release_resources)
979        pdata->release_resources();
980    return ret;
981}
982
983static int lp5523_remove(struct i2c_client *client)
984{
985    struct lp5523_chip *chip = i2c_get_clientdata(client);
986    int i;
987
988    lp5523_unregister_sysfs(client);
989
990    for (i = 0; i < chip->num_leds; i++) {
991        led_classdev_unregister(&chip->leds[i].cdev);
992        cancel_work_sync(&chip->leds[i].brightness_work);
993    }
994
995    if (chip->pdata->enable)
996        chip->pdata->enable(0);
997    if (chip->pdata->release_resources)
998        chip->pdata->release_resources();
999    return 0;
1000}
1001
1002static const struct i2c_device_id lp5523_id[] = {
1003    { "lp5523", 0 },
1004    { }
1005};
1006
1007MODULE_DEVICE_TABLE(i2c, lp5523_id);
1008
1009static struct i2c_driver lp5523_driver = {
1010    .driver = {
1011        .name = "lp5523",
1012    },
1013    .probe = lp5523_probe,
1014    .remove = lp5523_remove,
1015    .id_table = lp5523_id,
1016};
1017
1018module_i2c_driver(lp5523_driver);
1019
1020MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1021MODULE_DESCRIPTION("LP5523 LED engine");
1022MODULE_LICENSE("GPL");
1023

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