blob: 77c26bc32eed561a26c4ccb45b3238e60184d017 [file] [log] [blame]
Milo(Woogyom) Kimc93d08f2013-02-05 18:01:23 +09001/*
Kim, Miloff45262a2013-02-18 21:10:14 -08002 * LP5521/LP5523/LP55231/LP5562 Common Driver
Milo(Woogyom) Kimc93d08f2013-02-05 18:01:23 +09003 *
4 * Copyright 2012 Texas Instruments
5 *
6 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Derived from leds-lp5521.c, leds-lp5523.c
13 */
14
Kim, Milo53b41922013-03-20 17:37:00 -070015#include <linux/clk.h>
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +090016#include <linux/delay.h>
Milo(Woogyom) Kim10c06d12013-02-05 19:17:20 +090017#include <linux/firmware.h>
Milo(Woogyom) Kimc93d08f2013-02-05 18:01:23 +090018#include <linux/i2c.h>
19#include <linux/leds.h>
20#include <linux/module.h>
21#include <linux/platform_data/leds-lp55xx.h>
Linus Walleij7542a04b2013-04-23 04:52:59 -070022#include <linux/slab.h>
Sebastian Reichel30dae2f2013-10-22 11:02:56 -070023#include <linux/gpio.h>
24#include <linux/of_gpio.h>
Milo(Woogyom) Kimc93d08f2013-02-05 18:01:23 +090025
26#include "leds-lp55xx-common.h"
27
Kim, Milo53b41922013-03-20 17:37:00 -070028/* External clock rate */
29#define LP55XX_CLK_32K 32768
30
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +090031static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
32{
33 return container_of(cdev, struct lp55xx_led, cdev);
34}
35
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +090036static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
37{
38 return cdev_to_lp55xx_led(dev_get_drvdata(dev));
39}
40
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +090041static void lp55xx_reset_device(struct lp55xx_chip *chip)
42{
43 struct lp55xx_device_config *cfg = chip->cfg;
44 u8 addr = cfg->reset.addr;
45 u8 val = cfg->reset.val;
46
47 /* no error checking here because no ACK from the device after reset */
48 lp55xx_write(chip, addr, val);
49}
50
Milo(Woogyom) Kime3a700d2013-02-05 18:09:56 +090051static int lp55xx_detect_device(struct lp55xx_chip *chip)
52{
53 struct lp55xx_device_config *cfg = chip->cfg;
54 u8 addr = cfg->enable.addr;
55 u8 val = cfg->enable.val;
56 int ret;
57
58 ret = lp55xx_write(chip, addr, val);
59 if (ret)
60 return ret;
61
62 usleep_range(1000, 2000);
63
64 ret = lp55xx_read(chip, addr, &val);
65 if (ret)
66 return ret;
67
68 if (val != cfg->enable.val)
69 return -ENODEV;
70
71 return 0;
72}
73
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +090074static int lp55xx_post_init_device(struct lp55xx_chip *chip)
75{
76 struct lp55xx_device_config *cfg = chip->cfg;
77
78 if (!cfg->post_init_device)
79 return 0;
80
81 return cfg->post_init_device(chip);
82}
83
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +090084static ssize_t lp55xx_show_current(struct device *dev,
85 struct device_attribute *attr,
86 char *buf)
87{
88 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
89
Kim, Milo24d32122013-03-14 17:19:36 -070090 return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current);
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +090091}
92
93static ssize_t lp55xx_store_current(struct device *dev,
94 struct device_attribute *attr,
95 const char *buf, size_t len)
96{
97 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
98 struct lp55xx_chip *chip = led->chip;
99 unsigned long curr;
100
101 if (kstrtoul(buf, 0, &curr))
102 return -EINVAL;
103
104 if (curr > led->max_current)
105 return -EINVAL;
106
107 if (!chip->cfg->set_led_current)
108 return len;
109
110 mutex_lock(&chip->lock);
111 chip->cfg->set_led_current(led, (u8)curr);
112 mutex_unlock(&chip->lock);
113
114 return len;
115}
116
117static ssize_t lp55xx_show_max_current(struct device *dev,
118 struct device_attribute *attr,
119 char *buf)
120{
121 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
122
Kim, Milo24d32122013-03-14 17:19:36 -0700123 return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current);
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900124}
125
126static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, lp55xx_show_current,
127 lp55xx_store_current);
128static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
129
Johan Hovold44a12552014-06-25 10:08:56 -0700130static struct attribute *lp55xx_led_attrs[] = {
Milo(Woogyom) Kima96bfa12013-02-05 19:09:32 +0900131 &dev_attr_led_current.attr,
132 &dev_attr_max_current.attr,
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900133 NULL,
134};
Johan Hovold44a12552014-06-25 10:08:56 -0700135ATTRIBUTE_GROUPS(lp55xx_led);
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900136
137static void lp55xx_set_brightness(struct led_classdev *cdev,
138 enum led_brightness brightness)
139{
Milo(Woogyom) Kima6e46792013-02-05 19:08:40 +0900140 struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
141
142 led->brightness = (u8)brightness;
143 schedule_work(&led->brightness_work);
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900144}
145
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900146static int lp55xx_init_led(struct lp55xx_led *led,
147 struct lp55xx_chip *chip, int chan)
148{
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900149 struct lp55xx_platform_data *pdata = chip->pdata;
150 struct lp55xx_device_config *cfg = chip->cfg;
151 struct device *dev = &chip->cl->dev;
152 char name[32];
153 int ret;
154 int max_channel = cfg->max_channel;
155
156 if (chan >= max_channel) {
157 dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
158 return -EINVAL;
159 }
160
161 if (pdata->led_config[chan].led_current == 0)
162 return 0;
163
164 led->led_current = pdata->led_config[chan].led_current;
165 led->max_current = pdata->led_config[chan].max_current;
166 led->chan_nr = pdata->led_config[chan].chan_nr;
Linus Walleijf65f0a12013-09-15 03:50:17 -0700167 led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900168
169 if (led->chan_nr >= max_channel) {
170 dev_err(dev, "Use channel numbers between 0 and %d\n",
171 max_channel - 1);
172 return -EINVAL;
173 }
174
175 led->cdev.brightness_set = lp55xx_set_brightness;
Johan Hovold44a12552014-06-25 10:08:56 -0700176 led->cdev.groups = lp55xx_led_groups;
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900177
178 if (pdata->led_config[chan].name) {
179 led->cdev.name = pdata->led_config[chan].name;
180 } else {
181 snprintf(name, sizeof(name), "%s:channel%d",
182 pdata->label ? : chip->cl->name, chan);
183 led->cdev.name = name;
184 }
185
Milo(Woogyom) Kim0e202342013-02-05 19:07:34 +0900186 ret = led_classdev_register(dev, &led->cdev);
187 if (ret) {
188 dev_err(dev, "led register err: %d\n", ret);
189 return ret;
190 }
191
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900192 return 0;
193}
194
Milo(Woogyom) Kim10c06d12013-02-05 19:17:20 +0900195static void lp55xx_firmware_loaded(const struct firmware *fw, void *context)
196{
197 struct lp55xx_chip *chip = context;
198 struct device *dev = &chip->cl->dev;
Milo Kim93ad8a12013-11-20 22:14:34 -0800199 enum lp55xx_engine_index idx = chip->engine_idx;
Milo(Woogyom) Kim10c06d12013-02-05 19:17:20 +0900200
201 if (!fw) {
202 dev_err(dev, "firmware request failed\n");
203 goto out;
204 }
205
206 /* handling firmware data is chip dependent */
207 mutex_lock(&chip->lock);
208
Milo Kim93ad8a12013-11-20 22:14:34 -0800209 chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
Milo(Woogyom) Kim10c06d12013-02-05 19:17:20 +0900210 chip->fw = fw;
211 if (chip->cfg->firmware_cb)
212 chip->cfg->firmware_cb(chip);
213
214 mutex_unlock(&chip->lock);
215
216out:
217 /* firmware should be released for other channel use */
218 release_firmware(chip->fw);
219}
220
221static int lp55xx_request_firmware(struct lp55xx_chip *chip)
222{
223 const char *name = chip->cl->name;
224 struct device *dev = &chip->cl->dev;
225
226 return request_firmware_nowait(THIS_MODULE, true, name, dev,
227 GFP_KERNEL, chip, lp55xx_firmware_loaded);
228}
229
230static ssize_t lp55xx_show_engine_select(struct device *dev,
231 struct device_attribute *attr,
232 char *buf)
233{
234 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
235 struct lp55xx_chip *chip = led->chip;
236
237 return sprintf(buf, "%d\n", chip->engine_idx);
238}
239
240static ssize_t lp55xx_store_engine_select(struct device *dev,
241 struct device_attribute *attr,
242 const char *buf, size_t len)
243{
244 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
245 struct lp55xx_chip *chip = led->chip;
246 unsigned long val;
247 int ret;
248
249 if (kstrtoul(buf, 0, &val))
250 return -EINVAL;
251
252 /* select the engine to be run */
253
254 switch (val) {
255 case LP55XX_ENGINE_1:
256 case LP55XX_ENGINE_2:
257 case LP55XX_ENGINE_3:
258 mutex_lock(&chip->lock);
259 chip->engine_idx = val;
260 ret = lp55xx_request_firmware(chip);
261 mutex_unlock(&chip->lock);
262 break;
263 default:
264 dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
265 return -EINVAL;
266 }
267
268 if (ret) {
269 dev_err(dev, "request firmware err: %d\n", ret);
270 return ret;
271 }
272
273 return len;
274}
275
276static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
277{
278 if (chip->cfg->run_engine)
279 chip->cfg->run_engine(chip, start);
280}
281
282static ssize_t lp55xx_store_engine_run(struct device *dev,
283 struct device_attribute *attr,
284 const char *buf, size_t len)
285{
286 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
287 struct lp55xx_chip *chip = led->chip;
288 unsigned long val;
289
290 if (kstrtoul(buf, 0, &val))
291 return -EINVAL;
292
293 /* run or stop the selected engine */
294
295 if (val <= 0) {
296 lp55xx_run_engine(chip, false);
297 return len;
298 }
299
300 mutex_lock(&chip->lock);
301 lp55xx_run_engine(chip, true);
302 mutex_unlock(&chip->lock);
303
304 return len;
305}
306
307static DEVICE_ATTR(select_engine, S_IRUGO | S_IWUSR,
308 lp55xx_show_engine_select, lp55xx_store_engine_select);
309static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
310
Milo(Woogyom) Kimb3b6f812013-02-05 19:15:27 +0900311static struct attribute *lp55xx_engine_attributes[] = {
Milo(Woogyom) Kim10c06d12013-02-05 19:17:20 +0900312 &dev_attr_select_engine.attr,
313 &dev_attr_run_engine.attr,
Milo(Woogyom) Kimb3b6f812013-02-05 19:15:27 +0900314 NULL,
315};
316
317static const struct attribute_group lp55xx_engine_attr_group = {
318 .attrs = lp55xx_engine_attributes,
319};
320
Milo(Woogyom) Kimc93d08f2013-02-05 18:01:23 +0900321int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
322{
323 return i2c_smbus_write_byte_data(chip->cl, reg, val);
324}
325EXPORT_SYMBOL_GPL(lp55xx_write);
326
327int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
328{
329 s32 ret;
330
331 ret = i2c_smbus_read_byte_data(chip->cl, reg);
332 if (ret < 0)
333 return ret;
334
335 *val = ret;
336 return 0;
337}
338EXPORT_SYMBOL_GPL(lp55xx_read);
339
340int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
341{
342 int ret;
343 u8 tmp;
344
345 ret = lp55xx_read(chip, reg, &tmp);
346 if (ret)
347 return ret;
348
349 tmp &= ~mask;
350 tmp |= val & mask;
351
352 return lp55xx_write(chip, reg, tmp);
353}
354EXPORT_SYMBOL_GPL(lp55xx_update_bits);
355
Kim, Milo53b41922013-03-20 17:37:00 -0700356bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
357{
358 struct clk *clk;
359 int err;
360
361 clk = devm_clk_get(&chip->cl->dev, "32k_clk");
362 if (IS_ERR(clk))
363 goto use_internal_clk;
364
365 err = clk_prepare_enable(clk);
366 if (err)
367 goto use_internal_clk;
368
369 if (clk_get_rate(clk) != LP55XX_CLK_32K) {
370 clk_disable_unprepare(clk);
371 goto use_internal_clk;
372 }
373
374 dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K);
375
376 chip->clk = clk;
377 return true;
378
379use_internal_clk:
380 dev_info(&chip->cl->dev, "internal clock used\n");
381 return false;
382}
383EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
384
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900385int lp55xx_init_device(struct lp55xx_chip *chip)
386{
387 struct lp55xx_platform_data *pdata;
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900388 struct lp55xx_device_config *cfg;
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900389 struct device *dev = &chip->cl->dev;
390 int ret = 0;
391
392 WARN_ON(!chip);
393
394 pdata = chip->pdata;
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900395 cfg = chip->cfg;
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900396
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900397 if (!pdata || !cfg)
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900398 return -EINVAL;
399
Sebastian Reichel30dae2f2013-10-22 11:02:56 -0700400 if (gpio_is_valid(pdata->enable_gpio)) {
401 ret = devm_gpio_request_one(dev, pdata->enable_gpio,
402 GPIOF_DIR_OUT, "lp5523_enable");
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900403 if (ret < 0) {
Sebastian Reichel30dae2f2013-10-22 11:02:56 -0700404 dev_err(dev, "could not acquire enable gpio (err=%d)\n",
405 ret);
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900406 goto err;
407 }
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900408
Sebastian Reichel30dae2f2013-10-22 11:02:56 -0700409 gpio_set_value(pdata->enable_gpio, 0);
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900410 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
Sebastian Reichel30dae2f2013-10-22 11:02:56 -0700411 gpio_set_value(pdata->enable_gpio, 1);
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900412 usleep_range(1000, 2000); /* 500us abs min. */
413 }
414
Milo(Woogyom) Kim48068d52013-02-05 18:08:49 +0900415 lp55xx_reset_device(chip);
416
417 /*
418 * Exact value is not available. 10 - 20ms
419 * appears to be enough for reset.
420 */
421 usleep_range(10000, 20000);
422
Milo(Woogyom) Kime3a700d2013-02-05 18:09:56 +0900423 ret = lp55xx_detect_device(chip);
424 if (ret) {
425 dev_err(dev, "device detection err: %d\n", ret);
426 goto err;
427 }
428
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900429 /* chip specific initialization */
430 ret = lp55xx_post_init_device(chip);
Milo(Woogyom) Kim22ebeb42013-02-05 18:58:35 +0900431 if (ret) {
432 dev_err(dev, "post init device err: %d\n", ret);
433 goto err_post_init;
434 }
Milo(Woogyom) Kimffbdccd2013-02-05 18:57:36 +0900435
436 return 0;
437
Milo(Woogyom) Kim22ebeb42013-02-05 18:58:35 +0900438err_post_init:
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900439 lp55xx_deinit_device(chip);
Milo(Woogyom) Kima85908d2013-02-05 18:07:20 +0900440err:
441 return ret;
442}
443EXPORT_SYMBOL_GPL(lp55xx_init_device);
444
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900445void lp55xx_deinit_device(struct lp55xx_chip *chip)
446{
447 struct lp55xx_platform_data *pdata = chip->pdata;
448
Kim, Milo53b41922013-03-20 17:37:00 -0700449 if (chip->clk)
450 clk_disable_unprepare(chip->clk);
451
Sebastian Reichel30dae2f2013-10-22 11:02:56 -0700452 if (gpio_is_valid(pdata->enable_gpio))
453 gpio_set_value(pdata->enable_gpio, 0);
Milo(Woogyom) Kim6ce61762013-02-05 19:03:02 +0900454}
455EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
456
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900457int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
458{
459 struct lp55xx_platform_data *pdata = chip->pdata;
460 struct lp55xx_device_config *cfg = chip->cfg;
461 int num_channels = pdata->num_channels;
462 struct lp55xx_led *each;
463 u8 led_current;
464 int ret;
465 int i;
466
467 if (!cfg->brightness_work_fn) {
468 dev_err(&chip->cl->dev, "empty brightness configuration\n");
469 return -EINVAL;
470 }
471
472 for (i = 0; i < num_channels; i++) {
473
474 /* do not initialize channels that are not connected */
475 if (pdata->led_config[i].led_current == 0)
476 continue;
477
478 led_current = pdata->led_config[i].led_current;
479 each = led + i;
480 ret = lp55xx_init_led(each, chip, i);
481 if (ret)
482 goto err_init_led;
483
484 INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
485
486 chip->num_leds++;
487 each->chip = chip;
488
489 /* setting led current at each channel */
490 if (cfg->set_led_current)
491 cfg->set_led_current(each, led_current);
492 }
493
494 return 0;
495
496err_init_led:
Milo(Woogyom) Kimd9067d22013-02-05 19:12:47 +0900497 lp55xx_unregister_leds(led, chip);
Milo(Woogyom) Kim9e9b3db2013-02-05 19:06:27 +0900498 return ret;
499}
500EXPORT_SYMBOL_GPL(lp55xx_register_leds);
501
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900502void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
503{
504 int i;
505 struct lp55xx_led *each;
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900506
507 for (i = 0; i < chip->num_leds; i++) {
508 each = led + i;
Milo(Woogyom) Kimc3a68eb2013-02-05 19:11:18 +0900509 led_classdev_unregister(&each->cdev);
510 flush_work(&each->brightness_work);
511 }
512}
513EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
514
Milo(Woogyom) Kimb3b6f812013-02-05 19:15:27 +0900515int lp55xx_register_sysfs(struct lp55xx_chip *chip)
516{
517 struct device *dev = &chip->cl->dev;
Milo(Woogyom) Kim240085e2013-02-05 19:20:01 +0900518 struct lp55xx_device_config *cfg = chip->cfg;
519 int ret;
Milo(Woogyom) Kimb3b6f812013-02-05 19:15:27 +0900520
Milo(Woogyom) Kim240085e2013-02-05 19:20:01 +0900521 if (!cfg->run_engine || !cfg->firmware_cb)
522 goto dev_specific_attrs;
523
524 ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
525 if (ret)
526 return ret;
527
528dev_specific_attrs:
529 return cfg->dev_attr_group ?
530 sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
Milo(Woogyom) Kimb3b6f812013-02-05 19:15:27 +0900531}
532EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
533
Milo(Woogyom) Kimba6fa842013-02-05 19:23:04 +0900534void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
535{
536 struct device *dev = &chip->cl->dev;
537 struct lp55xx_device_config *cfg = chip->cfg;
538
539 if (cfg->dev_attr_group)
540 sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
541
542 sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
543}
544EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
545
Linus Walleij7542a04b2013-04-23 04:52:59 -0700546int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
547{
Kim, Milo2dac9122013-05-07 00:14:48 -0700548 struct device_node *child;
Linus Walleij7542a04b2013-04-23 04:52:59 -0700549 struct lp55xx_platform_data *pdata;
Kim, Milo2dac9122013-05-07 00:14:48 -0700550 struct lp55xx_led_config *cfg;
551 int num_channels;
552 int i = 0;
Linus Walleij7542a04b2013-04-23 04:52:59 -0700553
554 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
555 if (!pdata)
556 return -ENOMEM;
557
Kim, Milo2dac9122013-05-07 00:14:48 -0700558 num_channels = of_get_child_count(np);
559 if (num_channels == 0) {
560 dev_err(dev, "no LED channels\n");
561 return -EINVAL;
562 }
Linus Walleij7542a04b2013-04-23 04:52:59 -0700563
Kim, Milo2dac9122013-05-07 00:14:48 -0700564 cfg = devm_kzalloc(dev, sizeof(*cfg) * num_channels, GFP_KERNEL);
565 if (!cfg)
Linus Walleij7542a04b2013-04-23 04:52:59 -0700566 return -ENOMEM;
567
Kim, Milo2dac9122013-05-07 00:14:48 -0700568 pdata->led_config = &cfg[0];
569 pdata->num_channels = num_channels;
570
571 for_each_child_of_node(np, child) {
572 cfg[i].chan_nr = i;
573
574 of_property_read_string(child, "chan-name", &cfg[i].name);
575 of_property_read_u8(child, "led-cur", &cfg[i].led_current);
576 of_property_read_u8(child, "max-cur", &cfg[i].max_current);
Linus Walleijf65f0a12013-09-15 03:50:17 -0700577 cfg[i].default_trigger =
578 of_get_property(child, "linux,default-trigger", NULL);
Kim, Milo2dac9122013-05-07 00:14:48 -0700579
580 i++;
Linus Walleij7542a04b2013-04-23 04:52:59 -0700581 }
Kim, Milo2dac9122013-05-07 00:14:48 -0700582
583 of_property_read_string(np, "label", &pdata->label);
584 of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
585
Sebastian Reichel30dae2f2013-10-22 11:02:56 -0700586 pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
587
Kim, Milo33b3a562013-07-09 02:11:37 -0700588 /* LP8501 specific */
589 of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);
590
Linus Walleij7542a04b2013-04-23 04:52:59 -0700591 dev->platform_data = pdata;
592
593 return 0;
594}
595EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);
596
Milo(Woogyom) Kimc93d08f2013-02-05 18:01:23 +0900597MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
598MODULE_DESCRIPTION("LP55xx Common Driver");
599MODULE_LICENSE("GPL");