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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LP5521 LED chip driver.
4 *
5 * Copyright (C) 2010 Nokia Corporation
6 * Copyright (C) 2012 Texas Instruments
7 *
8 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
9 * Milo(Woogyom) Kim <milo.kim@ti.com>
10 */
11
12#include <linux/delay.h>
13#include <linux/firmware.h>
14#include <linux/i2c.h>
15#include <linux/leds.h>
16#include <linux/module.h>
17#include <linux/mutex.h>
18#include <linux/platform_data/leds-lp55xx.h>
19#include <linux/slab.h>
20#include <linux/of.h>
21
22#include "leds-lp55xx-common.h"
23
24#define LP5521_PROGRAM_LENGTH 32
25#define LP5521_MAX_LEDS 3
26#define LP5521_CMD_DIRECT 0x3F
27
28/* Registers */
29#define LP5521_REG_ENABLE 0x00
30#define LP5521_REG_OP_MODE 0x01
31#define LP5521_REG_R_PWM 0x02
32#define LP5521_REG_G_PWM 0x03
33#define LP5521_REG_B_PWM 0x04
34#define LP5521_REG_R_CURRENT 0x05
35#define LP5521_REG_G_CURRENT 0x06
36#define LP5521_REG_B_CURRENT 0x07
37#define LP5521_REG_CONFIG 0x08
38#define LP5521_REG_STATUS 0x0C
39#define LP5521_REG_RESET 0x0D
40#define LP5521_REG_R_PROG_MEM 0x10
41#define LP5521_REG_G_PROG_MEM 0x30
42#define LP5521_REG_B_PROG_MEM 0x50
43
44/* Base register to set LED current */
45#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
46/* Base register to set the brightness */
47#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
48
49/* Bits in ENABLE register */
50#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
51#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
52#define LP5521_EXEC_RUN 0x2A
53#define LP5521_ENABLE_DEFAULT \
54 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
55#define LP5521_ENABLE_RUN_PROGRAM \
56 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
57
58/* CONFIG register */
59#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
60#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
61#define LP5521_CP_MODE_MASK 0x18 /* Charge pump mode */
62#define LP5521_CP_MODE_SHIFT 3
63#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */
64#define LP5521_CLK_INT 0x01 /* Internal clock */
65#define LP5521_DEFAULT_CFG (LP5521_PWM_HF | LP5521_PWRSAVE_EN)
66
67/* Status */
68#define LP5521_EXT_CLK_USED 0x08
69
70/* default R channel current register value */
71#define LP5521_REG_R_CURR_DEFAULT 0xAF
72
73/* Reset register value */
74#define LP5521_RESET 0xFF
75
76/* Program Memory Operations */
77#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */
78#define LP5521_MODE_G_M 0x0C
79#define LP5521_MODE_B_M 0x03
80#define LP5521_LOAD_R 0x10
81#define LP5521_LOAD_G 0x04
82#define LP5521_LOAD_B 0x01
83
84#define LP5521_R_IS_LOADING(mode) \
85 ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
86#define LP5521_G_IS_LOADING(mode) \
87 ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
88#define LP5521_B_IS_LOADING(mode) \
89 ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
90
91#define LP5521_EXEC_R_M 0x30 /* Enable Register */
92#define LP5521_EXEC_G_M 0x0C
93#define LP5521_EXEC_B_M 0x03
94#define LP5521_EXEC_M 0x3F
95#define LP5521_RUN_R 0x20
96#define LP5521_RUN_G 0x08
97#define LP5521_RUN_B 0x02
98
99static inline void lp5521_wait_opmode_done(void)
100{
101 /* operation mode change needs to be longer than 153 us */
102 usleep_range(200, 300);
103}
104
105static inline void lp5521_wait_enable_done(void)
106{
107 /* it takes more 488 us to update ENABLE register */
108 usleep_range(500, 600);
109}
110
111static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
112{
113 led->led_current = led_current;
114 lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
115 led_current);
116}
117
118static void lp5521_load_engine(struct lp55xx_chip *chip)
119{
120 enum lp55xx_engine_index idx = chip->engine_idx;
121 static const u8 mask[] = {
122 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
123 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
124 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
125 };
126
127 static const u8 val[] = {
128 [LP55XX_ENGINE_1] = LP5521_LOAD_R,
129 [LP55XX_ENGINE_2] = LP5521_LOAD_G,
130 [LP55XX_ENGINE_3] = LP5521_LOAD_B,
131 };
132
133 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
134
135 lp5521_wait_opmode_done();
136}
137
138static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
139{
140 lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
141 lp5521_wait_opmode_done();
142}
143
144static void lp5521_stop_engine(struct lp55xx_chip *chip)
145{
146 enum lp55xx_engine_index idx = chip->engine_idx;
147 static const u8 mask[] = {
148 [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
149 [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
150 [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
151 };
152
153 lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
154
155 lp5521_wait_opmode_done();
156}
157
158static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
159{
160 int ret;
161 u8 mode;
162 u8 exec;
163
164 /* stop engine */
165 if (!start) {
166 lp5521_stop_engine(chip);
167 lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
168 lp5521_wait_opmode_done();
169 return;
170 }
171
172 /*
173 * To run the engine,
174 * operation mode and enable register should updated at the same time
175 */
176
177 ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
178 if (ret)
179 return;
180
181 ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
182 if (ret)
183 return;
184
185 /* change operation mode to RUN only when each engine is loading */
186 if (LP5521_R_IS_LOADING(mode)) {
187 mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
188 exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
189 }
190
191 if (LP5521_G_IS_LOADING(mode)) {
192 mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
193 exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
194 }
195
196 if (LP5521_B_IS_LOADING(mode)) {
197 mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
198 exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
199 }
200
201 lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
202 lp5521_wait_opmode_done();
203
204 lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
205 lp5521_wait_enable_done();
206}
207
208static int lp5521_update_program_memory(struct lp55xx_chip *chip,
209 const u8 *data, size_t size)
210{
211 enum lp55xx_engine_index idx = chip->engine_idx;
212 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
213 static const u8 addr[] = {
214 [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
215 [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
216 [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
217 };
218 unsigned cmd;
219 char c[3];
220 int nrchars;
221 int ret;
222 int offset = 0;
223 int i = 0;
224
225 while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
226 /* separate sscanfs because length is working only for %s */
227 ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
228 if (ret != 1)
229 goto err;
230
231 ret = sscanf(c, "%2x", &cmd);
232 if (ret != 1)
233 goto err;
234
235 pattern[i] = (u8)cmd;
236 offset += nrchars;
237 i++;
238 }
239
240 /* Each instruction is 16bit long. Check that length is even */
241 if (i % 2)
242 goto err;
243
244 for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
245 ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
246 if (ret)
247 return -EINVAL;
248 }
249
250 return size;
251
252err:
253 dev_err(&chip->cl->dev, "wrong pattern format\n");
254 return -EINVAL;
255}
256
257static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
258{
259 const struct firmware *fw = chip->fw;
260
261 if (fw->size > LP5521_PROGRAM_LENGTH) {
262 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
263 fw->size);
264 return;
265 }
266
267 /*
268 * Program memory sequence
269 * 1) set engine mode to "LOAD"
270 * 2) write firmware data into program memory
271 */
272
273 lp5521_load_engine(chip);
274 lp5521_update_program_memory(chip, fw->data, fw->size);
275}
276
277static int lp5521_post_init_device(struct lp55xx_chip *chip)
278{
279 int ret;
280 u8 val;
281
282 /*
283 * Make sure that the chip is reset by reading back the r channel
284 * current reg. This is dummy read is required on some platforms -
285 * otherwise further access to the R G B channels in the
286 * LP5521_REG_ENABLE register will not have any effect - strange!
287 */
288 ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
289 if (ret) {
290 dev_err(&chip->cl->dev, "error in resetting chip\n");
291 return ret;
292 }
293 if (val != LP5521_REG_R_CURR_DEFAULT) {
294 dev_err(&chip->cl->dev,
295 "unexpected data in register (expected 0x%x got 0x%x)\n",
296 LP5521_REG_R_CURR_DEFAULT, val);
297 ret = -EINVAL;
298 return ret;
299 }
300 usleep_range(10000, 20000);
301
302 /* Set all PWMs to direct control mode */
303 ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
304 if (ret)
305 return ret;
306
307 /* Update configuration for the clock setting */
308 val = LP5521_DEFAULT_CFG;
309 if (!lp55xx_is_extclk_used(chip))
310 val |= LP5521_CLK_INT;
311
312 val |= (chip->pdata->charge_pump_mode << LP5521_CP_MODE_SHIFT) & LP5521_CP_MODE_MASK;
313
314 ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
315 if (ret)
316 return ret;
317
318 /* Initialize all channels PWM to zero -> leds off */
319 lp55xx_write(chip, LP5521_REG_R_PWM, 0);
320 lp55xx_write(chip, LP5521_REG_G_PWM, 0);
321 lp55xx_write(chip, LP5521_REG_B_PWM, 0);
322
323 /* Set engines are set to run state when OP_MODE enables engines */
324 ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
325 if (ret)
326 return ret;
327
328 lp5521_wait_enable_done();
329
330 return 0;
331}
332
333static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
334{
335 struct lp55xx_platform_data *pdata = chip->pdata;
336 int ret;
337 u8 status;
338
339 ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
340 if (ret < 0)
341 return ret;
342
343 if (pdata->clock_mode != LP55XX_CLOCK_EXT)
344 return 0;
345
346 /* Check that ext clock is really in use if requested */
347 if ((status & LP5521_EXT_CLK_USED) == 0)
348 return -EIO;
349
350 return 0;
351}
352
353static int lp5521_multicolor_brightness(struct lp55xx_led *led)
354{
355 struct lp55xx_chip *chip = led->chip;
356 int ret;
357 int i;
358
359 mutex_lock(&chip->lock);
360 for (i = 0; i < led->mc_cdev.num_colors; i++) {
361 ret = lp55xx_write(chip,
362 LP5521_REG_LED_PWM_BASE +
363 led->mc_cdev.subled_info[i].channel,
364 led->mc_cdev.subled_info[i].brightness);
365 if (ret)
366 break;
367 }
368 mutex_unlock(&chip->lock);
369 return ret;
370}
371
372static int lp5521_led_brightness(struct lp55xx_led *led)
373{
374 struct lp55xx_chip *chip = led->chip;
375 int ret;
376
377 mutex_lock(&chip->lock);
378 ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
379 led->brightness);
380 mutex_unlock(&chip->lock);
381
382 return ret;
383}
384
385static ssize_t show_engine_mode(struct device *dev,
386 struct device_attribute *attr,
387 char *buf, int nr)
388{
389 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
390 struct lp55xx_chip *chip = led->chip;
391 enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
392
393 switch (mode) {
394 case LP55XX_ENGINE_RUN:
395 return sprintf(buf, "run\n");
396 case LP55XX_ENGINE_LOAD:
397 return sprintf(buf, "load\n");
398 case LP55XX_ENGINE_DISABLED:
399 default:
400 return sprintf(buf, "disabled\n");
401 }
402}
403show_mode(1)
404show_mode(2)
405show_mode(3)
406
407static ssize_t store_engine_mode(struct device *dev,
408 struct device_attribute *attr,
409 const char *buf, size_t len, int nr)
410{
411 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
412 struct lp55xx_chip *chip = led->chip;
413 struct lp55xx_engine *engine = &chip->engines[nr - 1];
414
415 mutex_lock(&chip->lock);
416
417 chip->engine_idx = nr;
418
419 if (!strncmp(buf, "run", 3)) {
420 lp5521_run_engine(chip, true);
421 engine->mode = LP55XX_ENGINE_RUN;
422 } else if (!strncmp(buf, "load", 4)) {
423 lp5521_stop_engine(chip);
424 lp5521_load_engine(chip);
425 engine->mode = LP55XX_ENGINE_LOAD;
426 } else if (!strncmp(buf, "disabled", 8)) {
427 lp5521_stop_engine(chip);
428 engine->mode = LP55XX_ENGINE_DISABLED;
429 }
430
431 mutex_unlock(&chip->lock);
432
433 return len;
434}
435store_mode(1)
436store_mode(2)
437store_mode(3)
438
439static ssize_t store_engine_load(struct device *dev,
440 struct device_attribute *attr,
441 const char *buf, size_t len, int nr)
442{
443 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
444 struct lp55xx_chip *chip = led->chip;
445 int ret;
446
447 mutex_lock(&chip->lock);
448
449 chip->engine_idx = nr;
450 lp5521_load_engine(chip);
451 ret = lp5521_update_program_memory(chip, buf, len);
452
453 mutex_unlock(&chip->lock);
454
455 return ret;
456}
457store_load(1)
458store_load(2)
459store_load(3)
460
461static ssize_t lp5521_selftest(struct device *dev,
462 struct device_attribute *attr,
463 char *buf)
464{
465 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
466 struct lp55xx_chip *chip = led->chip;
467 int ret;
468
469 mutex_lock(&chip->lock);
470 ret = lp5521_run_selftest(chip, buf);
471 mutex_unlock(&chip->lock);
472
473 return sysfs_emit(buf, "%s\n", ret ? "FAIL" : "OK");
474}
475
476/* device attributes */
477static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
478static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
479static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
480static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
481static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
482static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
483static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
484
485static struct attribute *lp5521_attributes[] = {
486 &dev_attr_engine1_mode.attr,
487 &dev_attr_engine2_mode.attr,
488 &dev_attr_engine3_mode.attr,
489 &dev_attr_engine1_load.attr,
490 &dev_attr_engine2_load.attr,
491 &dev_attr_engine3_load.attr,
492 &dev_attr_selftest.attr,
493 NULL
494};
495
496static const struct attribute_group lp5521_group = {
497 .attrs = lp5521_attributes,
498};
499
500/* Chip specific configurations */
501static struct lp55xx_device_config lp5521_cfg = {
502 .reset = {
503 .addr = LP5521_REG_RESET,
504 .val = LP5521_RESET,
505 },
506 .enable = {
507 .addr = LP5521_REG_ENABLE,
508 .val = LP5521_ENABLE_DEFAULT,
509 },
510 .max_channel = LP5521_MAX_LEDS,
511 .post_init_device = lp5521_post_init_device,
512 .brightness_fn = lp5521_led_brightness,
513 .multicolor_brightness_fn = lp5521_multicolor_brightness,
514 .set_led_current = lp5521_set_led_current,
515 .firmware_cb = lp5521_firmware_loaded,
516 .run_engine = lp5521_run_engine,
517 .dev_attr_group = &lp5521_group,
518};
519
520static int lp5521_probe(struct i2c_client *client)
521{
522 const struct i2c_device_id *id = i2c_client_get_device_id(client);
523 int ret;
524 struct lp55xx_chip *chip;
525 struct lp55xx_led *led;
526 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
527 struct device_node *np = dev_of_node(&client->dev);
528
529 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
530 if (!chip)
531 return -ENOMEM;
532
533 chip->cfg = &lp5521_cfg;
534
535 if (!pdata) {
536 if (np) {
537 pdata = lp55xx_of_populate_pdata(&client->dev, np,
538 chip);
539 if (IS_ERR(pdata))
540 return PTR_ERR(pdata);
541 } else {
542 dev_err(&client->dev, "no platform data\n");
543 return -EINVAL;
544 }
545 }
546
547 led = devm_kcalloc(&client->dev,
548 pdata->num_channels, sizeof(*led), GFP_KERNEL);
549 if (!led)
550 return -ENOMEM;
551
552 chip->cl = client;
553 chip->pdata = pdata;
554
555 mutex_init(&chip->lock);
556
557 i2c_set_clientdata(client, led);
558
559 ret = lp55xx_init_device(chip);
560 if (ret)
561 goto err_init;
562
563 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
564
565 ret = lp55xx_register_leds(led, chip);
566 if (ret)
567 goto err_out;
568
569 ret = lp55xx_register_sysfs(chip);
570 if (ret) {
571 dev_err(&client->dev, "registering sysfs failed\n");
572 goto err_out;
573 }
574
575 return 0;
576
577err_out:
578 lp55xx_deinit_device(chip);
579err_init:
580 return ret;
581}
582
583static void lp5521_remove(struct i2c_client *client)
584{
585 struct lp55xx_led *led = i2c_get_clientdata(client);
586 struct lp55xx_chip *chip = led->chip;
587
588 lp5521_stop_all_engines(chip);
589 lp55xx_unregister_sysfs(chip);
590 lp55xx_deinit_device(chip);
591}
592
593static const struct i2c_device_id lp5521_id[] = {
594 { "lp5521", 0 }, /* Three channel chip */
595 { }
596};
597MODULE_DEVICE_TABLE(i2c, lp5521_id);
598
599static const struct of_device_id of_lp5521_leds_match[] = {
600 { .compatible = "national,lp5521", },
601 {},
602};
603
604MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
605
606static struct i2c_driver lp5521_driver = {
607 .driver = {
608 .name = "lp5521",
609 .of_match_table = of_lp5521_leds_match,
610 },
611 .probe = lp5521_probe,
612 .remove = lp5521_remove,
613 .id_table = lp5521_id,
614};
615
616module_i2c_driver(lp5521_driver);
617
618MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
619MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
620MODULE_DESCRIPTION("LP5521 LED engine");
621MODULE_LICENSE("GPL v2");
1/*
2 * LP5521 LED chip 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-lp5521.h>
35#include <linux/workqueue.h>
36#include <linux/slab.h>
37
38#define LP5521_PROGRAM_LENGTH 32 /* in bytes */
39
40#define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
41#define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
42
43#define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
44#define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
45
46#define LP5521_CMD_LOAD 0x15 /* 00010101 */
47#define LP5521_CMD_RUN 0x2a /* 00101010 */
48#define LP5521_CMD_DIRECT 0x3f /* 00111111 */
49#define LP5521_CMD_DISABLED 0x00 /* 00000000 */
50
51/* Registers */
52#define LP5521_REG_ENABLE 0x00
53#define LP5521_REG_OP_MODE 0x01
54#define LP5521_REG_R_PWM 0x02
55#define LP5521_REG_G_PWM 0x03
56#define LP5521_REG_B_PWM 0x04
57#define LP5521_REG_R_CURRENT 0x05
58#define LP5521_REG_G_CURRENT 0x06
59#define LP5521_REG_B_CURRENT 0x07
60#define LP5521_REG_CONFIG 0x08
61#define LP5521_REG_R_CHANNEL_PC 0x09
62#define LP5521_REG_G_CHANNEL_PC 0x0A
63#define LP5521_REG_B_CHANNEL_PC 0x0B
64#define LP5521_REG_STATUS 0x0C
65#define LP5521_REG_RESET 0x0D
66#define LP5521_REG_GPO 0x0E
67#define LP5521_REG_R_PROG_MEM 0x10
68#define LP5521_REG_G_PROG_MEM 0x30
69#define LP5521_REG_B_PROG_MEM 0x50
70
71#define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
72#define LP5521_PROG_MEM_SIZE 0x20
73
74/* Base register to set LED current */
75#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
76
77/* Base register to set the brightness */
78#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
79
80/* Bits in ENABLE register */
81#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
82#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
83#define LP5521_EXEC_RUN 0x2A
84#define LP5521_ENABLE_DEFAULT \
85 (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
86#define LP5521_ENABLE_RUN_PROGRAM \
87 (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
88
89/* Status */
90#define LP5521_EXT_CLK_USED 0x08
91
92/* default R channel current register value */
93#define LP5521_REG_R_CURR_DEFAULT 0xAF
94
95/* Pattern Mode */
96#define PATTERN_OFF 0
97
98struct lp5521_engine {
99 int id;
100 u8 mode;
101 u8 prog_page;
102 u8 engine_mask;
103};
104
105struct lp5521_led {
106 int id;
107 u8 chan_nr;
108 u8 led_current;
109 u8 max_current;
110 struct led_classdev cdev;
111 struct work_struct brightness_work;
112 u8 brightness;
113};
114
115struct lp5521_chip {
116 struct lp5521_platform_data *pdata;
117 struct mutex lock; /* Serialize control */
118 struct i2c_client *client;
119 struct lp5521_engine engines[LP5521_MAX_ENGINES];
120 struct lp5521_led leds[LP5521_MAX_LEDS];
121 u8 num_channels;
122 u8 num_leds;
123};
124
125static inline struct lp5521_led *cdev_to_led(struct led_classdev *cdev)
126{
127 return container_of(cdev, struct lp5521_led, cdev);
128}
129
130static inline struct lp5521_chip *engine_to_lp5521(struct lp5521_engine *engine)
131{
132 return container_of(engine, struct lp5521_chip,
133 engines[engine->id - 1]);
134}
135
136static inline struct lp5521_chip *led_to_lp5521(struct lp5521_led *led)
137{
138 return container_of(led, struct lp5521_chip,
139 leds[led->id]);
140}
141
142static void lp5521_led_brightness_work(struct work_struct *work);
143
144static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
145{
146 return i2c_smbus_write_byte_data(client, reg, value);
147}
148
149static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
150{
151 s32 ret;
152
153 ret = i2c_smbus_read_byte_data(client, reg);
154 if (ret < 0)
155 return -EIO;
156
157 *buf = ret;
158 return 0;
159}
160
161static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
162{
163 struct lp5521_chip *chip = engine_to_lp5521(engine);
164 struct i2c_client *client = chip->client;
165 int ret;
166 u8 engine_state;
167
168 /* Only transition between RUN and DIRECT mode are handled here */
169 if (mode == LP5521_CMD_LOAD)
170 return 0;
171
172 if (mode == LP5521_CMD_DISABLED)
173 mode = LP5521_CMD_DIRECT;
174
175 ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
176 if (ret < 0)
177 return ret;
178
179 /* set mode only for this engine */
180 engine_state &= ~(engine->engine_mask);
181 mode &= engine->engine_mask;
182 engine_state |= mode;
183 return lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
184}
185
186static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
187{
188 struct lp5521_chip *chip = engine_to_lp5521(eng);
189 struct i2c_client *client = chip->client;
190 int ret;
191 int addr;
192 u8 mode;
193
194 /* move current engine to direct mode and remember the state */
195 ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
196 if (ret)
197 return ret;
198
199 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
200 usleep_range(1000, 2000);
201 ret = lp5521_read(client, LP5521_REG_OP_MODE, &mode);
202 if (ret)
203 return ret;
204
205 /* For loading, all the engines to load mode */
206 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
207 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
208 usleep_range(1000, 2000);
209 lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
210 /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
211 usleep_range(1000, 2000);
212
213 addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
214 i2c_smbus_write_i2c_block_data(client,
215 addr,
216 LP5521_PROG_MEM_SIZE,
217 pattern);
218
219 return lp5521_write(client, LP5521_REG_OP_MODE, mode);
220}
221
222static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
223{
224 return lp5521_write(chip->client,
225 LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
226 curr);
227}
228
229static void lp5521_init_engine(struct lp5521_chip *chip)
230{
231 int i;
232 for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
233 chip->engines[i].id = i + 1;
234 chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
235 chip->engines[i].prog_page = i;
236 }
237}
238
239static int lp5521_configure(struct i2c_client *client)
240{
241 struct lp5521_chip *chip = i2c_get_clientdata(client);
242 int ret;
243 u8 cfg;
244
245 lp5521_init_engine(chip);
246
247 /* Set all PWMs to direct control mode */
248 ret = lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
249
250 cfg = chip->pdata->update_config ?
251 : (LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
252 ret |= lp5521_write(client, LP5521_REG_CONFIG, cfg);
253
254 /* Initialize all channels PWM to zero -> leds off */
255 ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
256 ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
257 ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
258
259 /* Set engines are set to run state when OP_MODE enables engines */
260 ret |= lp5521_write(client, LP5521_REG_ENABLE,
261 LP5521_ENABLE_RUN_PROGRAM);
262 /* enable takes 500us. 1 - 2 ms leaves some margin */
263 usleep_range(1000, 2000);
264
265 return ret;
266}
267
268static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
269{
270 int ret;
271 u8 status;
272
273 ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
274 if (ret < 0)
275 return ret;
276
277 /* Check that ext clock is really in use if requested */
278 if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
279 if ((status & LP5521_EXT_CLK_USED) == 0)
280 return -EIO;
281 return 0;
282}
283
284static void lp5521_set_brightness(struct led_classdev *cdev,
285 enum led_brightness brightness)
286{
287 struct lp5521_led *led = cdev_to_led(cdev);
288 led->brightness = (u8)brightness;
289 schedule_work(&led->brightness_work);
290}
291
292static void lp5521_led_brightness_work(struct work_struct *work)
293{
294 struct lp5521_led *led = container_of(work,
295 struct lp5521_led,
296 brightness_work);
297 struct lp5521_chip *chip = led_to_lp5521(led);
298 struct i2c_client *client = chip->client;
299
300 mutex_lock(&chip->lock);
301 lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
302 led->brightness);
303 mutex_unlock(&chip->lock);
304}
305
306/* Detect the chip by setting its ENABLE register and reading it back. */
307static int lp5521_detect(struct i2c_client *client)
308{
309 int ret;
310 u8 buf;
311
312 ret = lp5521_write(client, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT);
313 if (ret)
314 return ret;
315 /* enable takes 500us. 1 - 2 ms leaves some margin */
316 usleep_range(1000, 2000);
317 ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
318 if (ret)
319 return ret;
320 if (buf != LP5521_ENABLE_DEFAULT)
321 return -ENODEV;
322
323 return 0;
324}
325
326/* Set engine mode and create appropriate sysfs attributes, if required. */
327static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
328{
329 int ret = 0;
330
331 /* if in that mode already do nothing, except for run */
332 if (mode == engine->mode && mode != LP5521_CMD_RUN)
333 return 0;
334
335 if (mode == LP5521_CMD_RUN) {
336 ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
337 } else if (mode == LP5521_CMD_LOAD) {
338 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
339 lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
340 } else if (mode == LP5521_CMD_DISABLED) {
341 lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
342 }
343
344 engine->mode = mode;
345
346 return ret;
347}
348
349static int lp5521_do_store_load(struct lp5521_engine *engine,
350 const char *buf, size_t len)
351{
352 struct lp5521_chip *chip = engine_to_lp5521(engine);
353 struct i2c_client *client = chip->client;
354 int ret, nrchars, offset = 0, i = 0;
355 char c[3];
356 unsigned cmd;
357 u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
358
359 while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
360 /* separate sscanfs because length is working only for %s */
361 ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
362 if (ret != 2)
363 goto fail;
364 ret = sscanf(c, "%2x", &cmd);
365 if (ret != 1)
366 goto fail;
367 pattern[i] = (u8)cmd;
368
369 offset += nrchars;
370 i++;
371 }
372
373 /* Each instruction is 16bit long. Check that length is even */
374 if (i % 2)
375 goto fail;
376
377 mutex_lock(&chip->lock);
378 if (engine->mode == LP5521_CMD_LOAD)
379 ret = lp5521_load_program(engine, pattern);
380 else
381 ret = -EINVAL;
382 mutex_unlock(&chip->lock);
383
384 if (ret) {
385 dev_err(&client->dev, "failed loading pattern\n");
386 return ret;
387 }
388
389 return len;
390fail:
391 dev_err(&client->dev, "wrong pattern format\n");
392 return -EINVAL;
393}
394
395static ssize_t store_engine_load(struct device *dev,
396 struct device_attribute *attr,
397 const char *buf, size_t len, int nr)
398{
399 struct i2c_client *client = to_i2c_client(dev);
400 struct lp5521_chip *chip = i2c_get_clientdata(client);
401 return lp5521_do_store_load(&chip->engines[nr - 1], buf, len);
402}
403
404#define store_load(nr) \
405static ssize_t store_engine##nr##_load(struct device *dev, \
406 struct device_attribute *attr, \
407 const char *buf, size_t len) \
408{ \
409 return store_engine_load(dev, attr, buf, len, nr); \
410}
411store_load(1)
412store_load(2)
413store_load(3)
414
415static ssize_t show_engine_mode(struct device *dev,
416 struct device_attribute *attr,
417 char *buf, int nr)
418{
419 struct i2c_client *client = to_i2c_client(dev);
420 struct lp5521_chip *chip = i2c_get_clientdata(client);
421 switch (chip->engines[nr - 1].mode) {
422 case LP5521_CMD_RUN:
423 return sprintf(buf, "run\n");
424 case LP5521_CMD_LOAD:
425 return sprintf(buf, "load\n");
426 case LP5521_CMD_DISABLED:
427 return sprintf(buf, "disabled\n");
428 default:
429 return sprintf(buf, "disabled\n");
430 }
431}
432
433#define show_mode(nr) \
434static ssize_t show_engine##nr##_mode(struct device *dev, \
435 struct device_attribute *attr, \
436 char *buf) \
437{ \
438 return show_engine_mode(dev, attr, buf, nr); \
439}
440show_mode(1)
441show_mode(2)
442show_mode(3)
443
444static ssize_t store_engine_mode(struct device *dev,
445 struct device_attribute *attr,
446 const char *buf, size_t len, int nr)
447{
448 struct i2c_client *client = to_i2c_client(dev);
449 struct lp5521_chip *chip = i2c_get_clientdata(client);
450 struct lp5521_engine *engine = &chip->engines[nr - 1];
451 mutex_lock(&chip->lock);
452
453 if (!strncmp(buf, "run", 3))
454 lp5521_set_mode(engine, LP5521_CMD_RUN);
455 else if (!strncmp(buf, "load", 4))
456 lp5521_set_mode(engine, LP5521_CMD_LOAD);
457 else if (!strncmp(buf, "disabled", 8))
458 lp5521_set_mode(engine, LP5521_CMD_DISABLED);
459
460 mutex_unlock(&chip->lock);
461 return len;
462}
463
464#define store_mode(nr) \
465static ssize_t store_engine##nr##_mode(struct device *dev, \
466 struct device_attribute *attr, \
467 const char *buf, size_t len) \
468{ \
469 return store_engine_mode(dev, attr, buf, len, nr); \
470}
471store_mode(1)
472store_mode(2)
473store_mode(3)
474
475static ssize_t show_max_current(struct device *dev,
476 struct device_attribute *attr,
477 char *buf)
478{
479 struct led_classdev *led_cdev = dev_get_drvdata(dev);
480 struct lp5521_led *led = cdev_to_led(led_cdev);
481
482 return sprintf(buf, "%d\n", led->max_current);
483}
484
485static ssize_t show_current(struct device *dev,
486 struct device_attribute *attr,
487 char *buf)
488{
489 struct led_classdev *led_cdev = dev_get_drvdata(dev);
490 struct lp5521_led *led = cdev_to_led(led_cdev);
491
492 return sprintf(buf, "%d\n", led->led_current);
493}
494
495static ssize_t store_current(struct device *dev,
496 struct device_attribute *attr,
497 const char *buf, size_t len)
498{
499 struct led_classdev *led_cdev = dev_get_drvdata(dev);
500 struct lp5521_led *led = cdev_to_led(led_cdev);
501 struct lp5521_chip *chip = led_to_lp5521(led);
502 ssize_t ret;
503 unsigned long curr;
504
505 if (kstrtoul(buf, 0, &curr))
506 return -EINVAL;
507
508 if (curr > led->max_current)
509 return -EINVAL;
510
511 mutex_lock(&chip->lock);
512 ret = lp5521_set_led_current(chip, led->id, curr);
513 mutex_unlock(&chip->lock);
514
515 if (ret < 0)
516 return ret;
517
518 led->led_current = (u8)curr;
519
520 return len;
521}
522
523static ssize_t lp5521_selftest(struct device *dev,
524 struct device_attribute *attr,
525 char *buf)
526{
527 struct i2c_client *client = to_i2c_client(dev);
528 struct lp5521_chip *chip = i2c_get_clientdata(client);
529 int ret;
530
531 mutex_lock(&chip->lock);
532 ret = lp5521_run_selftest(chip, buf);
533 mutex_unlock(&chip->lock);
534 return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
535}
536
537static void lp5521_clear_program_memory(struct i2c_client *cl)
538{
539 int i;
540 u8 rgb_mem[] = {
541 LP5521_REG_R_PROG_MEM,
542 LP5521_REG_G_PROG_MEM,
543 LP5521_REG_B_PROG_MEM,
544 };
545
546 for (i = 0; i < ARRAY_SIZE(rgb_mem); i++) {
547 lp5521_write(cl, rgb_mem[i], 0);
548 lp5521_write(cl, rgb_mem[i] + 1, 0);
549 }
550}
551
552static void lp5521_write_program_memory(struct i2c_client *cl,
553 u8 base, u8 *rgb, int size)
554{
555 int i;
556
557 if (!rgb || size <= 0)
558 return;
559
560 for (i = 0; i < size; i++)
561 lp5521_write(cl, base + i, *(rgb + i));
562
563 lp5521_write(cl, base + i, 0);
564 lp5521_write(cl, base + i + 1, 0);
565}
566
567static inline struct lp5521_led_pattern *lp5521_get_pattern
568 (struct lp5521_chip *chip, u8 offset)
569{
570 struct lp5521_led_pattern *ptn;
571 ptn = chip->pdata->patterns + (offset - 1);
572 return ptn;
573}
574
575static void lp5521_run_led_pattern(int mode, struct lp5521_chip *chip)
576{
577 struct lp5521_led_pattern *ptn;
578 struct i2c_client *cl = chip->client;
579 int num_patterns = chip->pdata->num_patterns;
580
581 if (mode > num_patterns || !(chip->pdata->patterns))
582 return;
583
584 if (mode == PATTERN_OFF) {
585 lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_DEFAULT);
586 usleep_range(1000, 2000);
587 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
588 } else {
589 ptn = lp5521_get_pattern(chip, mode);
590 if (!ptn)
591 return;
592
593 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
594 usleep_range(1000, 2000);
595
596 lp5521_clear_program_memory(cl);
597
598 lp5521_write_program_memory(cl, LP5521_REG_R_PROG_MEM,
599 ptn->r, ptn->size_r);
600 lp5521_write_program_memory(cl, LP5521_REG_G_PROG_MEM,
601 ptn->g, ptn->size_g);
602 lp5521_write_program_memory(cl, LP5521_REG_B_PROG_MEM,
603 ptn->b, ptn->size_b);
604
605 lp5521_write(cl, LP5521_REG_OP_MODE, LP5521_CMD_RUN);
606 usleep_range(1000, 2000);
607 lp5521_write(cl, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
608 }
609}
610
611static ssize_t store_led_pattern(struct device *dev,
612 struct device_attribute *attr,
613 const char *buf, size_t len)
614{
615 struct lp5521_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
616 unsigned long val;
617 int ret;
618
619 ret = strict_strtoul(buf, 16, &val);
620 if (ret)
621 return ret;
622
623 lp5521_run_led_pattern(val, chip);
624
625 return len;
626}
627
628/* led class device attributes */
629static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
630static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
631
632static struct attribute *lp5521_led_attributes[] = {
633 &dev_attr_led_current.attr,
634 &dev_attr_max_current.attr,
635 NULL,
636};
637
638static struct attribute_group lp5521_led_attribute_group = {
639 .attrs = lp5521_led_attributes
640};
641
642/* device attributes */
643static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
644 show_engine1_mode, store_engine1_mode);
645static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
646 show_engine2_mode, store_engine2_mode);
647static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
648 show_engine3_mode, store_engine3_mode);
649static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
650static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
651static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
652static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
653static DEVICE_ATTR(led_pattern, S_IWUSR, NULL, store_led_pattern);
654
655static struct attribute *lp5521_attributes[] = {
656 &dev_attr_engine1_mode.attr,
657 &dev_attr_engine2_mode.attr,
658 &dev_attr_engine3_mode.attr,
659 &dev_attr_selftest.attr,
660 &dev_attr_engine1_load.attr,
661 &dev_attr_engine2_load.attr,
662 &dev_attr_engine3_load.attr,
663 &dev_attr_led_pattern.attr,
664 NULL
665};
666
667static const struct attribute_group lp5521_group = {
668 .attrs = lp5521_attributes,
669};
670
671static int lp5521_register_sysfs(struct i2c_client *client)
672{
673 struct device *dev = &client->dev;
674 return sysfs_create_group(&dev->kobj, &lp5521_group);
675}
676
677static void lp5521_unregister_sysfs(struct i2c_client *client)
678{
679 struct lp5521_chip *chip = i2c_get_clientdata(client);
680 struct device *dev = &client->dev;
681 int i;
682
683 sysfs_remove_group(&dev->kobj, &lp5521_group);
684
685 for (i = 0; i < chip->num_leds; i++)
686 sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
687 &lp5521_led_attribute_group);
688}
689
690static int __devinit lp5521_init_led(struct lp5521_led *led,
691 struct i2c_client *client,
692 int chan, struct lp5521_platform_data *pdata)
693{
694 struct device *dev = &client->dev;
695 char name[32];
696 int res;
697
698 if (chan >= LP5521_MAX_LEDS)
699 return -EINVAL;
700
701 if (pdata->led_config[chan].led_current == 0)
702 return 0;
703
704 led->led_current = pdata->led_config[chan].led_current;
705 led->max_current = pdata->led_config[chan].max_current;
706 led->chan_nr = pdata->led_config[chan].chan_nr;
707
708 if (led->chan_nr >= LP5521_MAX_LEDS) {
709 dev_err(dev, "Use channel numbers between 0 and %d\n",
710 LP5521_MAX_LEDS - 1);
711 return -EINVAL;
712 }
713
714 led->cdev.brightness_set = lp5521_set_brightness;
715 if (pdata->led_config[chan].name) {
716 led->cdev.name = pdata->led_config[chan].name;
717 } else {
718 snprintf(name, sizeof(name), "%s:channel%d",
719 pdata->label ?: client->name, chan);
720 led->cdev.name = name;
721 }
722
723 res = led_classdev_register(dev, &led->cdev);
724 if (res < 0) {
725 dev_err(dev, "couldn't register led on channel %d\n", chan);
726 return res;
727 }
728
729 res = sysfs_create_group(&led->cdev.dev->kobj,
730 &lp5521_led_attribute_group);
731 if (res < 0) {
732 dev_err(dev, "couldn't register current attribute\n");
733 led_classdev_unregister(&led->cdev);
734 return res;
735 }
736 return 0;
737}
738
739static int __devinit lp5521_probe(struct i2c_client *client,
740 const struct i2c_device_id *id)
741{
742 struct lp5521_chip *chip;
743 struct lp5521_platform_data *pdata;
744 int ret, i, led;
745 u8 buf;
746
747 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
748 if (!chip)
749 return -ENOMEM;
750
751 i2c_set_clientdata(client, chip);
752 chip->client = client;
753
754 pdata = client->dev.platform_data;
755
756 if (!pdata) {
757 dev_err(&client->dev, "no platform data\n");
758 ret = -EINVAL;
759 goto fail1;
760 }
761
762 mutex_init(&chip->lock);
763
764 chip->pdata = pdata;
765
766 if (pdata->setup_resources) {
767 ret = pdata->setup_resources();
768 if (ret < 0)
769 goto fail1;
770 }
771
772 if (pdata->enable) {
773 pdata->enable(0);
774 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
775 pdata->enable(1);
776 usleep_range(1000, 2000); /* 500us abs min. */
777 }
778
779 lp5521_write(client, LP5521_REG_RESET, 0xff);
780 usleep_range(10000, 20000); /*
781 * Exact value is not available. 10 - 20ms
782 * appears to be enough for reset.
783 */
784
785 /*
786 * Make sure that the chip is reset by reading back the r channel
787 * current reg. This is dummy read is required on some platforms -
788 * otherwise further access to the R G B channels in the
789 * LP5521_REG_ENABLE register will not have any effect - strange!
790 */
791 ret = lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
792 if (ret || buf != LP5521_REG_R_CURR_DEFAULT) {
793 dev_err(&client->dev, "error in resetting chip\n");
794 goto fail2;
795 }
796 usleep_range(10000, 20000);
797
798 ret = lp5521_detect(client);
799
800 if (ret) {
801 dev_err(&client->dev, "Chip not found\n");
802 goto fail2;
803 }
804
805 dev_info(&client->dev, "%s programmable led chip found\n", id->name);
806
807 ret = lp5521_configure(client);
808 if (ret < 0) {
809 dev_err(&client->dev, "error configuring chip\n");
810 goto fail2;
811 }
812
813 /* Initialize leds */
814 chip->num_channels = pdata->num_channels;
815 chip->num_leds = 0;
816 led = 0;
817 for (i = 0; i < pdata->num_channels; i++) {
818 /* Do not initialize channels that are not connected */
819 if (pdata->led_config[i].led_current == 0)
820 continue;
821
822 ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
823 if (ret) {
824 dev_err(&client->dev, "error initializing leds\n");
825 goto fail3;
826 }
827 chip->num_leds++;
828
829 chip->leds[led].id = led;
830 /* Set initial LED current */
831 lp5521_set_led_current(chip, led,
832 chip->leds[led].led_current);
833
834 INIT_WORK(&(chip->leds[led].brightness_work),
835 lp5521_led_brightness_work);
836
837 led++;
838 }
839
840 ret = lp5521_register_sysfs(client);
841 if (ret) {
842 dev_err(&client->dev, "registering sysfs failed\n");
843 goto fail3;
844 }
845 return ret;
846fail3:
847 for (i = 0; i < chip->num_leds; i++) {
848 led_classdev_unregister(&chip->leds[i].cdev);
849 cancel_work_sync(&chip->leds[i].brightness_work);
850 }
851fail2:
852 if (pdata->enable)
853 pdata->enable(0);
854 if (pdata->release_resources)
855 pdata->release_resources();
856fail1:
857 kfree(chip);
858 return ret;
859}
860
861static int __devexit lp5521_remove(struct i2c_client *client)
862{
863 struct lp5521_chip *chip = i2c_get_clientdata(client);
864 int i;
865
866 lp5521_run_led_pattern(PATTERN_OFF, chip);
867 lp5521_unregister_sysfs(client);
868
869 for (i = 0; i < chip->num_leds; i++) {
870 led_classdev_unregister(&chip->leds[i].cdev);
871 cancel_work_sync(&chip->leds[i].brightness_work);
872 }
873
874 if (chip->pdata->enable)
875 chip->pdata->enable(0);
876 if (chip->pdata->release_resources)
877 chip->pdata->release_resources();
878 kfree(chip);
879 return 0;
880}
881
882static const struct i2c_device_id lp5521_id[] = {
883 { "lp5521", 0 }, /* Three channel chip */
884 { }
885};
886MODULE_DEVICE_TABLE(i2c, lp5521_id);
887
888static struct i2c_driver lp5521_driver = {
889 .driver = {
890 .name = "lp5521",
891 },
892 .probe = lp5521_probe,
893 .remove = __devexit_p(lp5521_remove),
894 .id_table = lp5521_id,
895};
896
897module_i2c_driver(lp5521_driver);
898
899MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
900MODULE_DESCRIPTION("LP5521 LED engine");
901MODULE_LICENSE("GPL v2");