Commit | Line | Data |
---|---|---|
c93d08fa | 1 | /* |
ff45262a | 2 | * LP5521/LP5523/LP55231/LP5562 Common Driver |
c93d08fa MWK |
3 | * |
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 | ||
53b41922 | 15 | #include <linux/clk.h> |
a85908dd | 16 | #include <linux/delay.h> |
10c06d17 | 17 | #include <linux/firmware.h> |
c93d08fa MWK |
18 | #include <linux/i2c.h> |
19 | #include <linux/leds.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/platform_data/leds-lp55xx.h> | |
7542a04b | 22 | #include <linux/slab.h> |
30dae2f9 SR |
23 | #include <linux/gpio.h> |
24 | #include <linux/of_gpio.h> | |
c93d08fa MWK |
25 | |
26 | #include "leds-lp55xx-common.h" | |
27 | ||
53b41922 KM |
28 | /* External clock rate */ |
29 | #define LP55XX_CLK_32K 32768 | |
30 | ||
a6e4679a MWK |
31 | static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev) |
32 | { | |
33 | return container_of(cdev, struct lp55xx_led, cdev); | |
34 | } | |
35 | ||
a96bfa13 MWK |
36 | static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev) |
37 | { | |
38 | return cdev_to_lp55xx_led(dev_get_drvdata(dev)); | |
39 | } | |
40 | ||
48068d5d MWK |
41 | static 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 | ||
e3a700d8 MWK |
51 | static 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 | ||
ffbdccdb MWK |
74 | static 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 | ||
a96bfa13 MWK |
84 | static 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 | ||
24d32128 | 90 | return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current); |
a96bfa13 MWK |
91 | } |
92 | ||
93 | static 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 | ||
117 | static 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 | ||
24d32128 | 123 | return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current); |
a96bfa13 MWK |
124 | } |
125 | ||
126 | static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, lp55xx_show_current, | |
127 | lp55xx_store_current); | |
128 | static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL); | |
129 | ||
0e202346 | 130 | static struct attribute *lp55xx_led_attributes[] = { |
a96bfa13 MWK |
131 | &dev_attr_led_current.attr, |
132 | &dev_attr_max_current.attr, | |
0e202346 MWK |
133 | NULL, |
134 | }; | |
135 | ||
136 | static struct attribute_group lp55xx_led_attr_group = { | |
137 | .attrs = lp55xx_led_attributes | |
138 | }; | |
139 | ||
140 | static void lp55xx_set_brightness(struct led_classdev *cdev, | |
141 | enum led_brightness brightness) | |
142 | { | |
a6e4679a MWK |
143 | struct lp55xx_led *led = cdev_to_lp55xx_led(cdev); |
144 | ||
145 | led->brightness = (u8)brightness; | |
146 | schedule_work(&led->brightness_work); | |
0e202346 MWK |
147 | } |
148 | ||
9e9b3db1 MWK |
149 | static int lp55xx_init_led(struct lp55xx_led *led, |
150 | struct lp55xx_chip *chip, int chan) | |
151 | { | |
0e202346 MWK |
152 | struct lp55xx_platform_data *pdata = chip->pdata; |
153 | struct lp55xx_device_config *cfg = chip->cfg; | |
154 | struct device *dev = &chip->cl->dev; | |
155 | char name[32]; | |
156 | int ret; | |
157 | int max_channel = cfg->max_channel; | |
158 | ||
159 | if (chan >= max_channel) { | |
160 | dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel); | |
161 | return -EINVAL; | |
162 | } | |
163 | ||
164 | if (pdata->led_config[chan].led_current == 0) | |
165 | return 0; | |
166 | ||
167 | led->led_current = pdata->led_config[chan].led_current; | |
168 | led->max_current = pdata->led_config[chan].max_current; | |
169 | led->chan_nr = pdata->led_config[chan].chan_nr; | |
f65f0a1a | 170 | led->cdev.default_trigger = pdata->led_config[chan].default_trigger; |
0e202346 MWK |
171 | |
172 | if (led->chan_nr >= max_channel) { | |
173 | dev_err(dev, "Use channel numbers between 0 and %d\n", | |
174 | max_channel - 1); | |
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | led->cdev.brightness_set = lp55xx_set_brightness; | |
179 | ||
180 | if (pdata->led_config[chan].name) { | |
181 | led->cdev.name = pdata->led_config[chan].name; | |
182 | } else { | |
183 | snprintf(name, sizeof(name), "%s:channel%d", | |
184 | pdata->label ? : chip->cl->name, chan); | |
185 | led->cdev.name = name; | |
186 | } | |
187 | ||
188 | /* | |
189 | * register led class device for each channel and | |
190 | * add device attributes | |
191 | */ | |
192 | ||
193 | ret = led_classdev_register(dev, &led->cdev); | |
194 | if (ret) { | |
195 | dev_err(dev, "led register err: %d\n", ret); | |
196 | return ret; | |
197 | } | |
198 | ||
199 | ret = sysfs_create_group(&led->cdev.dev->kobj, &lp55xx_led_attr_group); | |
200 | if (ret) { | |
201 | dev_err(dev, "led sysfs err: %d\n", ret); | |
202 | led_classdev_unregister(&led->cdev); | |
203 | return ret; | |
204 | } | |
205 | ||
9e9b3db1 MWK |
206 | return 0; |
207 | } | |
208 | ||
10c06d17 MWK |
209 | static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) |
210 | { | |
211 | struct lp55xx_chip *chip = context; | |
212 | struct device *dev = &chip->cl->dev; | |
93ad8a1d | 213 | enum lp55xx_engine_index idx = chip->engine_idx; |
10c06d17 MWK |
214 | |
215 | if (!fw) { | |
216 | dev_err(dev, "firmware request failed\n"); | |
217 | goto out; | |
218 | } | |
219 | ||
220 | /* handling firmware data is chip dependent */ | |
221 | mutex_lock(&chip->lock); | |
222 | ||
93ad8a1d | 223 | chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD; |
10c06d17 MWK |
224 | chip->fw = fw; |
225 | if (chip->cfg->firmware_cb) | |
226 | chip->cfg->firmware_cb(chip); | |
227 | ||
228 | mutex_unlock(&chip->lock); | |
229 | ||
230 | out: | |
231 | /* firmware should be released for other channel use */ | |
232 | release_firmware(chip->fw); | |
233 | } | |
234 | ||
235 | static int lp55xx_request_firmware(struct lp55xx_chip *chip) | |
236 | { | |
237 | const char *name = chip->cl->name; | |
238 | struct device *dev = &chip->cl->dev; | |
239 | ||
240 | return request_firmware_nowait(THIS_MODULE, true, name, dev, | |
241 | GFP_KERNEL, chip, lp55xx_firmware_loaded); | |
242 | } | |
243 | ||
244 | static ssize_t lp55xx_show_engine_select(struct device *dev, | |
245 | struct device_attribute *attr, | |
246 | char *buf) | |
247 | { | |
248 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); | |
249 | struct lp55xx_chip *chip = led->chip; | |
250 | ||
251 | return sprintf(buf, "%d\n", chip->engine_idx); | |
252 | } | |
253 | ||
254 | static ssize_t lp55xx_store_engine_select(struct device *dev, | |
255 | struct device_attribute *attr, | |
256 | const char *buf, size_t len) | |
257 | { | |
258 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); | |
259 | struct lp55xx_chip *chip = led->chip; | |
260 | unsigned long val; | |
261 | int ret; | |
262 | ||
263 | if (kstrtoul(buf, 0, &val)) | |
264 | return -EINVAL; | |
265 | ||
266 | /* select the engine to be run */ | |
267 | ||
268 | switch (val) { | |
269 | case LP55XX_ENGINE_1: | |
270 | case LP55XX_ENGINE_2: | |
271 | case LP55XX_ENGINE_3: | |
272 | mutex_lock(&chip->lock); | |
273 | chip->engine_idx = val; | |
274 | ret = lp55xx_request_firmware(chip); | |
275 | mutex_unlock(&chip->lock); | |
276 | break; | |
277 | default: | |
278 | dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
282 | if (ret) { | |
283 | dev_err(dev, "request firmware err: %d\n", ret); | |
284 | return ret; | |
285 | } | |
286 | ||
287 | return len; | |
288 | } | |
289 | ||
290 | static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start) | |
291 | { | |
292 | if (chip->cfg->run_engine) | |
293 | chip->cfg->run_engine(chip, start); | |
294 | } | |
295 | ||
296 | static ssize_t lp55xx_store_engine_run(struct device *dev, | |
297 | struct device_attribute *attr, | |
298 | const char *buf, size_t len) | |
299 | { | |
300 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); | |
301 | struct lp55xx_chip *chip = led->chip; | |
302 | unsigned long val; | |
303 | ||
304 | if (kstrtoul(buf, 0, &val)) | |
305 | return -EINVAL; | |
306 | ||
307 | /* run or stop the selected engine */ | |
308 | ||
309 | if (val <= 0) { | |
310 | lp55xx_run_engine(chip, false); | |
311 | return len; | |
312 | } | |
313 | ||
314 | mutex_lock(&chip->lock); | |
315 | lp55xx_run_engine(chip, true); | |
316 | mutex_unlock(&chip->lock); | |
317 | ||
318 | return len; | |
319 | } | |
320 | ||
321 | static DEVICE_ATTR(select_engine, S_IRUGO | S_IWUSR, | |
322 | lp55xx_show_engine_select, lp55xx_store_engine_select); | |
323 | static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run); | |
324 | ||
b3b6f811 | 325 | static struct attribute *lp55xx_engine_attributes[] = { |
10c06d17 MWK |
326 | &dev_attr_select_engine.attr, |
327 | &dev_attr_run_engine.attr, | |
b3b6f811 MWK |
328 | NULL, |
329 | }; | |
330 | ||
331 | static const struct attribute_group lp55xx_engine_attr_group = { | |
332 | .attrs = lp55xx_engine_attributes, | |
333 | }; | |
334 | ||
c93d08fa MWK |
335 | int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val) |
336 | { | |
337 | return i2c_smbus_write_byte_data(chip->cl, reg, val); | |
338 | } | |
339 | EXPORT_SYMBOL_GPL(lp55xx_write); | |
340 | ||
341 | int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val) | |
342 | { | |
343 | s32 ret; | |
344 | ||
345 | ret = i2c_smbus_read_byte_data(chip->cl, reg); | |
346 | if (ret < 0) | |
347 | return ret; | |
348 | ||
349 | *val = ret; | |
350 | return 0; | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(lp55xx_read); | |
353 | ||
354 | int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val) | |
355 | { | |
356 | int ret; | |
357 | u8 tmp; | |
358 | ||
359 | ret = lp55xx_read(chip, reg, &tmp); | |
360 | if (ret) | |
361 | return ret; | |
362 | ||
363 | tmp &= ~mask; | |
364 | tmp |= val & mask; | |
365 | ||
366 | return lp55xx_write(chip, reg, tmp); | |
367 | } | |
368 | EXPORT_SYMBOL_GPL(lp55xx_update_bits); | |
369 | ||
53b41922 KM |
370 | bool lp55xx_is_extclk_used(struct lp55xx_chip *chip) |
371 | { | |
372 | struct clk *clk; | |
373 | int err; | |
374 | ||
375 | clk = devm_clk_get(&chip->cl->dev, "32k_clk"); | |
376 | if (IS_ERR(clk)) | |
377 | goto use_internal_clk; | |
378 | ||
379 | err = clk_prepare_enable(clk); | |
380 | if (err) | |
381 | goto use_internal_clk; | |
382 | ||
383 | if (clk_get_rate(clk) != LP55XX_CLK_32K) { | |
384 | clk_disable_unprepare(clk); | |
385 | goto use_internal_clk; | |
386 | } | |
387 | ||
388 | dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K); | |
389 | ||
390 | chip->clk = clk; | |
391 | return true; | |
392 | ||
393 | use_internal_clk: | |
394 | dev_info(&chip->cl->dev, "internal clock used\n"); | |
395 | return false; | |
396 | } | |
397 | EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used); | |
398 | ||
a85908dd MWK |
399 | int lp55xx_init_device(struct lp55xx_chip *chip) |
400 | { | |
401 | struct lp55xx_platform_data *pdata; | |
48068d5d | 402 | struct lp55xx_device_config *cfg; |
a85908dd MWK |
403 | struct device *dev = &chip->cl->dev; |
404 | int ret = 0; | |
405 | ||
406 | WARN_ON(!chip); | |
407 | ||
408 | pdata = chip->pdata; | |
48068d5d | 409 | cfg = chip->cfg; |
a85908dd | 410 | |
48068d5d | 411 | if (!pdata || !cfg) |
a85908dd MWK |
412 | return -EINVAL; |
413 | ||
30dae2f9 SR |
414 | if (gpio_is_valid(pdata->enable_gpio)) { |
415 | ret = devm_gpio_request_one(dev, pdata->enable_gpio, | |
416 | GPIOF_DIR_OUT, "lp5523_enable"); | |
a85908dd | 417 | if (ret < 0) { |
30dae2f9 SR |
418 | dev_err(dev, "could not acquire enable gpio (err=%d)\n", |
419 | ret); | |
a85908dd MWK |
420 | goto err; |
421 | } | |
a85908dd | 422 | |
30dae2f9 | 423 | gpio_set_value(pdata->enable_gpio, 0); |
a85908dd | 424 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
30dae2f9 | 425 | gpio_set_value(pdata->enable_gpio, 1); |
a85908dd MWK |
426 | usleep_range(1000, 2000); /* 500us abs min. */ |
427 | } | |
428 | ||
48068d5d MWK |
429 | lp55xx_reset_device(chip); |
430 | ||
431 | /* | |
432 | * Exact value is not available. 10 - 20ms | |
433 | * appears to be enough for reset. | |
434 | */ | |
435 | usleep_range(10000, 20000); | |
436 | ||
e3a700d8 MWK |
437 | ret = lp55xx_detect_device(chip); |
438 | if (ret) { | |
439 | dev_err(dev, "device detection err: %d\n", ret); | |
440 | goto err; | |
441 | } | |
442 | ||
ffbdccdb MWK |
443 | /* chip specific initialization */ |
444 | ret = lp55xx_post_init_device(chip); | |
22ebeb48 MWK |
445 | if (ret) { |
446 | dev_err(dev, "post init device err: %d\n", ret); | |
447 | goto err_post_init; | |
448 | } | |
ffbdccdb MWK |
449 | |
450 | return 0; | |
451 | ||
22ebeb48 | 452 | err_post_init: |
6ce61762 MWK |
453 | lp55xx_deinit_device(chip); |
454 | err: | |
455 | return ret; | |
456 | } | |
457 | EXPORT_SYMBOL_GPL(lp55xx_init_device); | |
458 | ||
459 | void lp55xx_deinit_device(struct lp55xx_chip *chip) | |
460 | { | |
461 | struct lp55xx_platform_data *pdata = chip->pdata; | |
462 | ||
53b41922 KM |
463 | if (chip->clk) |
464 | clk_disable_unprepare(chip->clk); | |
465 | ||
30dae2f9 SR |
466 | if (gpio_is_valid(pdata->enable_gpio)) |
467 | gpio_set_value(pdata->enable_gpio, 0); | |
a85908dd | 468 | } |
6ce61762 | 469 | EXPORT_SYMBOL_GPL(lp55xx_deinit_device); |
a85908dd | 470 | |
9e9b3db1 MWK |
471 | int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip) |
472 | { | |
473 | struct lp55xx_platform_data *pdata = chip->pdata; | |
474 | struct lp55xx_device_config *cfg = chip->cfg; | |
475 | int num_channels = pdata->num_channels; | |
476 | struct lp55xx_led *each; | |
477 | u8 led_current; | |
478 | int ret; | |
479 | int i; | |
480 | ||
481 | if (!cfg->brightness_work_fn) { | |
482 | dev_err(&chip->cl->dev, "empty brightness configuration\n"); | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
486 | for (i = 0; i < num_channels; i++) { | |
487 | ||
488 | /* do not initialize channels that are not connected */ | |
489 | if (pdata->led_config[i].led_current == 0) | |
490 | continue; | |
491 | ||
492 | led_current = pdata->led_config[i].led_current; | |
493 | each = led + i; | |
494 | ret = lp55xx_init_led(each, chip, i); | |
495 | if (ret) | |
496 | goto err_init_led; | |
497 | ||
498 | INIT_WORK(&each->brightness_work, cfg->brightness_work_fn); | |
499 | ||
500 | chip->num_leds++; | |
501 | each->chip = chip; | |
502 | ||
503 | /* setting led current at each channel */ | |
504 | if (cfg->set_led_current) | |
505 | cfg->set_led_current(each, led_current); | |
506 | } | |
507 | ||
508 | return 0; | |
509 | ||
510 | err_init_led: | |
d9067d28 | 511 | lp55xx_unregister_leds(led, chip); |
9e9b3db1 MWK |
512 | return ret; |
513 | } | |
514 | EXPORT_SYMBOL_GPL(lp55xx_register_leds); | |
515 | ||
c3a68ebf MWK |
516 | void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip) |
517 | { | |
518 | int i; | |
519 | struct lp55xx_led *each; | |
c3a68ebf MWK |
520 | |
521 | for (i = 0; i < chip->num_leds; i++) { | |
522 | each = led + i; | |
c3a68ebf MWK |
523 | led_classdev_unregister(&each->cdev); |
524 | flush_work(&each->brightness_work); | |
525 | } | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(lp55xx_unregister_leds); | |
528 | ||
b3b6f811 MWK |
529 | int lp55xx_register_sysfs(struct lp55xx_chip *chip) |
530 | { | |
531 | struct device *dev = &chip->cl->dev; | |
240085e2 MWK |
532 | struct lp55xx_device_config *cfg = chip->cfg; |
533 | int ret; | |
534 | ||
535 | if (!cfg->run_engine || !cfg->firmware_cb) | |
536 | goto dev_specific_attrs; | |
537 | ||
538 | ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group); | |
539 | if (ret) | |
540 | return ret; | |
b3b6f811 | 541 | |
240085e2 MWK |
542 | dev_specific_attrs: |
543 | return cfg->dev_attr_group ? | |
544 | sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0; | |
b3b6f811 MWK |
545 | } |
546 | EXPORT_SYMBOL_GPL(lp55xx_register_sysfs); | |
547 | ||
ba6fa846 MWK |
548 | void lp55xx_unregister_sysfs(struct lp55xx_chip *chip) |
549 | { | |
550 | struct device *dev = &chip->cl->dev; | |
551 | struct lp55xx_device_config *cfg = chip->cfg; | |
552 | ||
553 | if (cfg->dev_attr_group) | |
554 | sysfs_remove_group(&dev->kobj, cfg->dev_attr_group); | |
555 | ||
556 | sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group); | |
557 | } | |
558 | EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs); | |
559 | ||
7542a04b LW |
560 | int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np) |
561 | { | |
2dac9128 | 562 | struct device_node *child; |
7542a04b | 563 | struct lp55xx_platform_data *pdata; |
2dac9128 KM |
564 | struct lp55xx_led_config *cfg; |
565 | int num_channels; | |
566 | int i = 0; | |
7542a04b LW |
567 | |
568 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
569 | if (!pdata) | |
570 | return -ENOMEM; | |
571 | ||
2dac9128 KM |
572 | num_channels = of_get_child_count(np); |
573 | if (num_channels == 0) { | |
574 | dev_err(dev, "no LED channels\n"); | |
575 | return -EINVAL; | |
576 | } | |
7542a04b | 577 | |
2dac9128 KM |
578 | cfg = devm_kzalloc(dev, sizeof(*cfg) * num_channels, GFP_KERNEL); |
579 | if (!cfg) | |
7542a04b LW |
580 | return -ENOMEM; |
581 | ||
2dac9128 KM |
582 | pdata->led_config = &cfg[0]; |
583 | pdata->num_channels = num_channels; | |
584 | ||
585 | for_each_child_of_node(np, child) { | |
586 | cfg[i].chan_nr = i; | |
587 | ||
588 | of_property_read_string(child, "chan-name", &cfg[i].name); | |
589 | of_property_read_u8(child, "led-cur", &cfg[i].led_current); | |
590 | of_property_read_u8(child, "max-cur", &cfg[i].max_current); | |
f65f0a1a LW |
591 | cfg[i].default_trigger = |
592 | of_get_property(child, "linux,default-trigger", NULL); | |
2dac9128 KM |
593 | |
594 | i++; | |
7542a04b | 595 | } |
2dac9128 KM |
596 | |
597 | of_property_read_string(np, "label", &pdata->label); | |
598 | of_property_read_u8(np, "clock-mode", &pdata->clock_mode); | |
599 | ||
30dae2f9 SR |
600 | pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0); |
601 | ||
33b3a561 KM |
602 | /* LP8501 specific */ |
603 | of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel); | |
604 | ||
7542a04b LW |
605 | dev->platform_data = pdata; |
606 | ||
607 | return 0; | |
608 | } | |
609 | EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata); | |
610 | ||
c93d08fa MWK |
611 | MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); |
612 | MODULE_DESCRIPTION("LP55xx Common Driver"); | |
613 | MODULE_LICENSE("GPL"); |