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-rw-r--r--drivers/leds/leds-lp5523.c1065
1 files changed, 1065 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
new file mode 100644
index 000000000000..1e11fcc08b28
--- /dev/null
+++ b/drivers/leds/leds-lp5523.c
@@ -0,0 +1,1065 @@
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 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
117struct 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
127struct 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
139static 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
145static 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
151static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
152static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
153static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
154
155static void lp5523_led_brightness_work(struct work_struct *work);
156
157static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
158{
159 return i2c_smbus_write_byte_data(client, reg, value);
160}
161
162static 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
173static 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
190static 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
266static 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);
285fail:
286 return ret;
287}
288
289static 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
306static 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
323static 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);
335fail:
336 return ret;
337}
338
339static 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
363static 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
376static 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) \
390static 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}
396show_leds(1)
397show_leds(2)
398show_leds(3)
399
400static 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) \
418static 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}
424store_leds(1)
425store_leds(2)
426store_leds(3)
427
428static 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;
497fail:
498 pos = sprintf(buf, "FAIL\n");
499
500release_lock:
501 mutex_unlock(&chip->lock);
502
503 return pos;
504}
505
506static 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
516static 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
532static 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;
569fail:
570 dev_err(&client->dev, "wrong pattern format\n");
571 return -EINVAL;
572}
573
574static 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) \
584static 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}
590store_load(1)
591store_load(2)
592store_load(3)
593
594static 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) \
613static 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}
619show_mode(1)
620show_mode(2)
621show_mode(3)
622
623static 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) \
644static 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}
650store_mode(1)
651store_mode(2)
652store_mode(3)
653
654static 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
664static 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
674static 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 */
705static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
706static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
707
708static struct attribute *lp5523_led_attributes[] = {
709 &dev_attr_led_current.attr,
710 &dev_attr_max_current.attr,
711 NULL,
712};
713
714static struct attribute_group lp5523_led_attribute_group = {
715 .attrs = lp5523_led_attributes
716};
717
718/* device attributes */
719static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
720 show_engine1_mode, store_engine1_mode);
721static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
722 show_engine2_mode, store_engine2_mode);
723static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
724 show_engine3_mode, store_engine3_mode);
725static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUGO,
726 show_engine1_leds, store_engine1_leds);
727static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUGO,
728 show_engine2_leds, store_engine2_leds);
729static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUGO,
730 show_engine3_leds, store_engine3_leds);
731static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
732static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
733static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
734static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
735
736static 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
744static struct attribute *lp5523_engine1_attributes[] = {
745 &dev_attr_engine1_load.attr,
746 &dev_attr_engine1_leds.attr,
747 NULL
748};
749
750static struct attribute *lp5523_engine2_attributes[] = {
751 &dev_attr_engine2_load.attr,
752 &dev_attr_engine2_leds.attr,
753 NULL
754};
755
756static struct attribute *lp5523_engine3_attributes[] = {
757 &dev_attr_engine3_load.attr,
758 &dev_attr_engine3_leds.attr,
759 NULL
760};
761
762static const struct attribute_group lp5523_group = {
763 .attrs = lp5523_attributes,
764};
765
766static const struct attribute_group lp5523_engine_group[] = {
767 {.attrs = lp5523_engine1_attributes },
768 {.attrs = lp5523_engine2_attributes },
769 {.attrs = lp5523_engine3_attributes },
770};
771
772static 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
784static 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/*--------------------------------------------------------------*/
804static 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/*--------------------------------------------------------------*/
841static 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
854static 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
897static struct i2c_driver lp5523_driver;
898
899static 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;
992fail3:
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 }
997fail2:
998 if (pdata->enable)
999 pdata->enable(0);
1000 if (pdata->release_resources)
1001 pdata->release_resources();
1002fail1:
1003 kfree(chip);
1004 return ret;
1005}
1006
1007static 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
1027static const struct i2c_device_id lp5523_id[] = {
1028 { "lp5523", 0 },
1029 { }
1030};
1031
1032MODULE_DEVICE_TABLE(i2c, lp5523_id);
1033
1034static 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
1043static 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
1055static void __exit lp5523_exit(void)
1056{
1057 i2c_del_driver(&lp5523_driver);
1058}
1059
1060module_init(lp5523_init);
1061module_exit(lp5523_exit);
1062
1063MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
1064MODULE_DESCRIPTION("LP5523 LED engine");
1065MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-05 10:46:27 -0500