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 | ||
44a1255b | 130 | static struct attribute *lp55xx_led_attrs[] = { |
a96bfa13 MWK |
131 | &dev_attr_led_current.attr, |
132 | &dev_attr_max_current.attr, | |
0e202346 MWK |
133 | NULL, |
134 | }; | |
44a1255b | 135 | ATTRIBUTE_GROUPS(lp55xx_led); |
0e202346 | 136 | |
95b2af63 | 137 | static int lp55xx_set_brightness(struct led_classdev *cdev, |
0e202346 MWK |
138 | enum led_brightness brightness) |
139 | { | |
a6e4679a | 140 | struct lp55xx_led *led = cdev_to_lp55xx_led(cdev); |
95b2af63 | 141 | struct lp55xx_device_config *cfg = led->chip->cfg; |
a6e4679a MWK |
142 | |
143 | led->brightness = (u8)brightness; | |
95b2af63 | 144 | return cfg->brightness_fn(led); |
0e202346 MWK |
145 | } |
146 | ||
9e9b3db1 MWK |
147 | static int lp55xx_init_led(struct lp55xx_led *led, |
148 | struct lp55xx_chip *chip, int chan) | |
149 | { | |
0e202346 MWK |
150 | struct lp55xx_platform_data *pdata = chip->pdata; |
151 | struct lp55xx_device_config *cfg = chip->cfg; | |
152 | struct device *dev = &chip->cl->dev; | |
153 | char name[32]; | |
154 | int ret; | |
155 | int max_channel = cfg->max_channel; | |
156 | ||
157 | if (chan >= max_channel) { | |
158 | dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel); | |
159 | return -EINVAL; | |
160 | } | |
161 | ||
162 | if (pdata->led_config[chan].led_current == 0) | |
163 | return 0; | |
164 | ||
165 | led->led_current = pdata->led_config[chan].led_current; | |
166 | led->max_current = pdata->led_config[chan].max_current; | |
167 | led->chan_nr = pdata->led_config[chan].chan_nr; | |
f65f0a1a | 168 | led->cdev.default_trigger = pdata->led_config[chan].default_trigger; |
0e202346 MWK |
169 | |
170 | if (led->chan_nr >= max_channel) { | |
171 | dev_err(dev, "Use channel numbers between 0 and %d\n", | |
172 | max_channel - 1); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
95b2af63 | 176 | led->cdev.brightness_set_blocking = lp55xx_set_brightness; |
44a1255b | 177 | led->cdev.groups = lp55xx_led_groups; |
0e202346 MWK |
178 | |
179 | if (pdata->led_config[chan].name) { | |
180 | led->cdev.name = pdata->led_config[chan].name; | |
181 | } else { | |
182 | snprintf(name, sizeof(name), "%s:channel%d", | |
183 | pdata->label ? : chip->cl->name, chan); | |
184 | led->cdev.name = name; | |
185 | } | |
186 | ||
0e202346 MWK |
187 | ret = led_classdev_register(dev, &led->cdev); |
188 | if (ret) { | |
189 | dev_err(dev, "led register err: %d\n", ret); | |
190 | return ret; | |
191 | } | |
192 | ||
9e9b3db1 MWK |
193 | return 0; |
194 | } | |
195 | ||
10c06d17 MWK |
196 | static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) |
197 | { | |
198 | struct lp55xx_chip *chip = context; | |
199 | struct device *dev = &chip->cl->dev; | |
93ad8a1d | 200 | enum lp55xx_engine_index idx = chip->engine_idx; |
10c06d17 MWK |
201 | |
202 | if (!fw) { | |
203 | dev_err(dev, "firmware request failed\n"); | |
204 | goto out; | |
205 | } | |
206 | ||
207 | /* handling firmware data is chip dependent */ | |
208 | mutex_lock(&chip->lock); | |
209 | ||
93ad8a1d | 210 | chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD; |
10c06d17 MWK |
211 | chip->fw = fw; |
212 | if (chip->cfg->firmware_cb) | |
213 | chip->cfg->firmware_cb(chip); | |
214 | ||
215 | mutex_unlock(&chip->lock); | |
216 | ||
217 | out: | |
218 | /* firmware should be released for other channel use */ | |
219 | release_firmware(chip->fw); | |
220 | } | |
221 | ||
222 | static int lp55xx_request_firmware(struct lp55xx_chip *chip) | |
223 | { | |
224 | const char *name = chip->cl->name; | |
225 | struct device *dev = &chip->cl->dev; | |
226 | ||
b6789320 | 227 | return request_firmware_nowait(THIS_MODULE, false, name, dev, |
10c06d17 MWK |
228 | GFP_KERNEL, chip, lp55xx_firmware_loaded); |
229 | } | |
230 | ||
231 | static ssize_t lp55xx_show_engine_select(struct device *dev, | |
232 | struct device_attribute *attr, | |
233 | char *buf) | |
234 | { | |
235 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); | |
236 | struct lp55xx_chip *chip = led->chip; | |
237 | ||
238 | return sprintf(buf, "%d\n", chip->engine_idx); | |
239 | } | |
240 | ||
241 | static ssize_t lp55xx_store_engine_select(struct device *dev, | |
242 | struct device_attribute *attr, | |
243 | const char *buf, size_t len) | |
244 | { | |
245 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); | |
246 | struct lp55xx_chip *chip = led->chip; | |
247 | unsigned long val; | |
248 | int ret; | |
249 | ||
250 | if (kstrtoul(buf, 0, &val)) | |
251 | return -EINVAL; | |
252 | ||
253 | /* select the engine to be run */ | |
254 | ||
255 | switch (val) { | |
256 | case LP55XX_ENGINE_1: | |
257 | case LP55XX_ENGINE_2: | |
258 | case LP55XX_ENGINE_3: | |
259 | mutex_lock(&chip->lock); | |
260 | chip->engine_idx = val; | |
261 | ret = lp55xx_request_firmware(chip); | |
262 | mutex_unlock(&chip->lock); | |
263 | break; | |
264 | default: | |
265 | dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val); | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | if (ret) { | |
270 | dev_err(dev, "request firmware err: %d\n", ret); | |
271 | return ret; | |
272 | } | |
273 | ||
274 | return len; | |
275 | } | |
276 | ||
277 | static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start) | |
278 | { | |
279 | if (chip->cfg->run_engine) | |
280 | chip->cfg->run_engine(chip, start); | |
281 | } | |
282 | ||
283 | static ssize_t lp55xx_store_engine_run(struct device *dev, | |
284 | struct device_attribute *attr, | |
285 | const char *buf, size_t len) | |
286 | { | |
287 | struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); | |
288 | struct lp55xx_chip *chip = led->chip; | |
289 | unsigned long val; | |
290 | ||
291 | if (kstrtoul(buf, 0, &val)) | |
292 | return -EINVAL; | |
293 | ||
294 | /* run or stop the selected engine */ | |
295 | ||
296 | if (val <= 0) { | |
297 | lp55xx_run_engine(chip, false); | |
298 | return len; | |
299 | } | |
300 | ||
301 | mutex_lock(&chip->lock); | |
302 | lp55xx_run_engine(chip, true); | |
303 | mutex_unlock(&chip->lock); | |
304 | ||
305 | return len; | |
306 | } | |
307 | ||
308 | static DEVICE_ATTR(select_engine, S_IRUGO | S_IWUSR, | |
309 | lp55xx_show_engine_select, lp55xx_store_engine_select); | |
310 | static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run); | |
311 | ||
b3b6f811 | 312 | static struct attribute *lp55xx_engine_attributes[] = { |
10c06d17 MWK |
313 | &dev_attr_select_engine.attr, |
314 | &dev_attr_run_engine.attr, | |
b3b6f811 MWK |
315 | NULL, |
316 | }; | |
317 | ||
318 | static const struct attribute_group lp55xx_engine_attr_group = { | |
319 | .attrs = lp55xx_engine_attributes, | |
320 | }; | |
321 | ||
c93d08fa MWK |
322 | int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val) |
323 | { | |
324 | return i2c_smbus_write_byte_data(chip->cl, reg, val); | |
325 | } | |
326 | EXPORT_SYMBOL_GPL(lp55xx_write); | |
327 | ||
328 | int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val) | |
329 | { | |
330 | s32 ret; | |
331 | ||
332 | ret = i2c_smbus_read_byte_data(chip->cl, reg); | |
333 | if (ret < 0) | |
334 | return ret; | |
335 | ||
336 | *val = ret; | |
337 | return 0; | |
338 | } | |
339 | EXPORT_SYMBOL_GPL(lp55xx_read); | |
340 | ||
341 | int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val) | |
342 | { | |
343 | int ret; | |
344 | u8 tmp; | |
345 | ||
346 | ret = lp55xx_read(chip, reg, &tmp); | |
347 | if (ret) | |
348 | return ret; | |
349 | ||
350 | tmp &= ~mask; | |
351 | tmp |= val & mask; | |
352 | ||
353 | return lp55xx_write(chip, reg, tmp); | |
354 | } | |
355 | EXPORT_SYMBOL_GPL(lp55xx_update_bits); | |
356 | ||
53b41922 KM |
357 | bool lp55xx_is_extclk_used(struct lp55xx_chip *chip) |
358 | { | |
359 | struct clk *clk; | |
360 | int err; | |
361 | ||
362 | clk = devm_clk_get(&chip->cl->dev, "32k_clk"); | |
363 | if (IS_ERR(clk)) | |
364 | goto use_internal_clk; | |
365 | ||
366 | err = clk_prepare_enable(clk); | |
367 | if (err) | |
368 | goto use_internal_clk; | |
369 | ||
370 | if (clk_get_rate(clk) != LP55XX_CLK_32K) { | |
371 | clk_disable_unprepare(clk); | |
372 | goto use_internal_clk; | |
373 | } | |
374 | ||
375 | dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K); | |
376 | ||
377 | chip->clk = clk; | |
378 | return true; | |
379 | ||
380 | use_internal_clk: | |
381 | dev_info(&chip->cl->dev, "internal clock used\n"); | |
382 | return false; | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used); | |
385 | ||
a85908dd MWK |
386 | int lp55xx_init_device(struct lp55xx_chip *chip) |
387 | { | |
388 | struct lp55xx_platform_data *pdata; | |
48068d5d | 389 | struct lp55xx_device_config *cfg; |
a85908dd MWK |
390 | struct device *dev = &chip->cl->dev; |
391 | int ret = 0; | |
392 | ||
393 | WARN_ON(!chip); | |
394 | ||
395 | pdata = chip->pdata; | |
48068d5d | 396 | cfg = chip->cfg; |
a85908dd | 397 | |
48068d5d | 398 | if (!pdata || !cfg) |
a85908dd MWK |
399 | return -EINVAL; |
400 | ||
30dae2f9 SR |
401 | if (gpio_is_valid(pdata->enable_gpio)) { |
402 | ret = devm_gpio_request_one(dev, pdata->enable_gpio, | |
403 | GPIOF_DIR_OUT, "lp5523_enable"); | |
a85908dd | 404 | if (ret < 0) { |
30dae2f9 SR |
405 | dev_err(dev, "could not acquire enable gpio (err=%d)\n", |
406 | ret); | |
a85908dd MWK |
407 | goto err; |
408 | } | |
a85908dd | 409 | |
30dae2f9 | 410 | gpio_set_value(pdata->enable_gpio, 0); |
a85908dd | 411 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ |
30dae2f9 | 412 | gpio_set_value(pdata->enable_gpio, 1); |
a85908dd MWK |
413 | usleep_range(1000, 2000); /* 500us abs min. */ |
414 | } | |
415 | ||
48068d5d MWK |
416 | lp55xx_reset_device(chip); |
417 | ||
418 | /* | |
419 | * Exact value is not available. 10 - 20ms | |
420 | * appears to be enough for reset. | |
421 | */ | |
422 | usleep_range(10000, 20000); | |
423 | ||
e3a700d8 MWK |
424 | ret = lp55xx_detect_device(chip); |
425 | if (ret) { | |
426 | dev_err(dev, "device detection err: %d\n", ret); | |
427 | goto err; | |
428 | } | |
429 | ||
ffbdccdb MWK |
430 | /* chip specific initialization */ |
431 | ret = lp55xx_post_init_device(chip); | |
22ebeb48 MWK |
432 | if (ret) { |
433 | dev_err(dev, "post init device err: %d\n", ret); | |
434 | goto err_post_init; | |
435 | } | |
ffbdccdb MWK |
436 | |
437 | return 0; | |
438 | ||
22ebeb48 | 439 | err_post_init: |
6ce61762 MWK |
440 | lp55xx_deinit_device(chip); |
441 | err: | |
442 | return ret; | |
443 | } | |
444 | EXPORT_SYMBOL_GPL(lp55xx_init_device); | |
445 | ||
446 | void lp55xx_deinit_device(struct lp55xx_chip *chip) | |
447 | { | |
448 | struct lp55xx_platform_data *pdata = chip->pdata; | |
449 | ||
53b41922 KM |
450 | if (chip->clk) |
451 | clk_disable_unprepare(chip->clk); | |
452 | ||
30dae2f9 SR |
453 | if (gpio_is_valid(pdata->enable_gpio)) |
454 | gpio_set_value(pdata->enable_gpio, 0); | |
a85908dd | 455 | } |
6ce61762 | 456 | EXPORT_SYMBOL_GPL(lp55xx_deinit_device); |
a85908dd | 457 | |
9e9b3db1 MWK |
458 | int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip) |
459 | { | |
460 | struct lp55xx_platform_data *pdata = chip->pdata; | |
461 | struct lp55xx_device_config *cfg = chip->cfg; | |
462 | int num_channels = pdata->num_channels; | |
463 | struct lp55xx_led *each; | |
464 | u8 led_current; | |
465 | int ret; | |
466 | int i; | |
467 | ||
95b2af63 | 468 | if (!cfg->brightness_fn) { |
9e9b3db1 MWK |
469 | dev_err(&chip->cl->dev, "empty brightness configuration\n"); |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | for (i = 0; i < num_channels; i++) { | |
474 | ||
475 | /* do not initialize channels that are not connected */ | |
476 | if (pdata->led_config[i].led_current == 0) | |
477 | continue; | |
478 | ||
479 | led_current = pdata->led_config[i].led_current; | |
480 | each = led + i; | |
481 | ret = lp55xx_init_led(each, chip, i); | |
482 | if (ret) | |
483 | goto err_init_led; | |
484 | ||
9e9b3db1 MWK |
485 | chip->num_leds++; |
486 | each->chip = chip; | |
487 | ||
488 | /* setting led current at each channel */ | |
489 | if (cfg->set_led_current) | |
490 | cfg->set_led_current(each, led_current); | |
491 | } | |
492 | ||
493 | return 0; | |
494 | ||
495 | err_init_led: | |
d9067d28 | 496 | lp55xx_unregister_leds(led, chip); |
9e9b3db1 MWK |
497 | return ret; |
498 | } | |
499 | EXPORT_SYMBOL_GPL(lp55xx_register_leds); | |
500 | ||
c3a68ebf MWK |
501 | void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip) |
502 | { | |
503 | int i; | |
504 | struct lp55xx_led *each; | |
c3a68ebf MWK |
505 | |
506 | for (i = 0; i < chip->num_leds; i++) { | |
507 | each = led + i; | |
c3a68ebf | 508 | led_classdev_unregister(&each->cdev); |
c3a68ebf MWK |
509 | } |
510 | } | |
511 | EXPORT_SYMBOL_GPL(lp55xx_unregister_leds); | |
512 | ||
b3b6f811 MWK |
513 | int lp55xx_register_sysfs(struct lp55xx_chip *chip) |
514 | { | |
515 | struct device *dev = &chip->cl->dev; | |
240085e2 MWK |
516 | struct lp55xx_device_config *cfg = chip->cfg; |
517 | int ret; | |
518 | ||
519 | if (!cfg->run_engine || !cfg->firmware_cb) | |
520 | goto dev_specific_attrs; | |
521 | ||
522 | ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group); | |
523 | if (ret) | |
524 | return ret; | |
b3b6f811 | 525 | |
240085e2 MWK |
526 | dev_specific_attrs: |
527 | return cfg->dev_attr_group ? | |
528 | sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0; | |
b3b6f811 MWK |
529 | } |
530 | EXPORT_SYMBOL_GPL(lp55xx_register_sysfs); | |
531 | ||
ba6fa846 MWK |
532 | void lp55xx_unregister_sysfs(struct lp55xx_chip *chip) |
533 | { | |
534 | struct device *dev = &chip->cl->dev; | |
535 | struct lp55xx_device_config *cfg = chip->cfg; | |
536 | ||
537 | if (cfg->dev_attr_group) | |
538 | sysfs_remove_group(&dev->kobj, cfg->dev_attr_group); | |
539 | ||
540 | sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group); | |
541 | } | |
542 | EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs); | |
543 | ||
ed133352 MK |
544 | struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev, |
545 | struct device_node *np) | |
7542a04b | 546 | { |
2dac9128 | 547 | struct device_node *child; |
7542a04b | 548 | struct lp55xx_platform_data *pdata; |
2dac9128 KM |
549 | struct lp55xx_led_config *cfg; |
550 | int num_channels; | |
551 | int i = 0; | |
7542a04b LW |
552 | |
553 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
554 | if (!pdata) | |
ed133352 | 555 | return ERR_PTR(-ENOMEM); |
7542a04b | 556 | |
2dac9128 KM |
557 | num_channels = of_get_child_count(np); |
558 | if (num_channels == 0) { | |
559 | dev_err(dev, "no LED channels\n"); | |
ed133352 | 560 | return ERR_PTR(-EINVAL); |
2dac9128 | 561 | } |
7542a04b | 562 | |
2dac9128 KM |
563 | cfg = devm_kzalloc(dev, sizeof(*cfg) * num_channels, GFP_KERNEL); |
564 | if (!cfg) | |
ed133352 | 565 | return ERR_PTR(-ENOMEM); |
7542a04b | 566 | |
2dac9128 KM |
567 | pdata->led_config = &cfg[0]; |
568 | pdata->num_channels = num_channels; | |
569 | ||
570 | for_each_child_of_node(np, child) { | |
571 | cfg[i].chan_nr = i; | |
572 | ||
573 | of_property_read_string(child, "chan-name", &cfg[i].name); | |
574 | of_property_read_u8(child, "led-cur", &cfg[i].led_current); | |
575 | of_property_read_u8(child, "max-cur", &cfg[i].max_current); | |
f65f0a1a LW |
576 | cfg[i].default_trigger = |
577 | of_get_property(child, "linux,default-trigger", NULL); | |
2dac9128 KM |
578 | |
579 | i++; | |
7542a04b | 580 | } |
2dac9128 KM |
581 | |
582 | of_property_read_string(np, "label", &pdata->label); | |
583 | of_property_read_u8(np, "clock-mode", &pdata->clock_mode); | |
584 | ||
30dae2f9 SR |
585 | pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0); |
586 | ||
33b3a561 KM |
587 | /* LP8501 specific */ |
588 | of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel); | |
589 | ||
ed133352 | 590 | return pdata; |
7542a04b LW |
591 | } |
592 | EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata); | |
593 | ||
c93d08fa MWK |
594 | MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); |
595 | MODULE_DESCRIPTION("LP55xx Common Driver"); | |
596 | MODULE_LICENSE("GPL"); |