1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * LP5521/LP5523/LP55231/LP5562 Common Driver
4 *
5 * Copyright 2012 Texas Instruments
6 *
7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
8 *
9 * Derived from leds-lp5521.c, leds-lp5523.c
10 */
11
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/firmware.h>
15 #include <linux/i2c.h>
16 #include <linux/leds.h>
17 #include <linux/module.h>
18 #include <linux/platform_data/leds-lp55xx.h>
19 #include <linux/slab.h>
20 #include <linux/gpio/consumer.h>
21 #include <dt-bindings/leds/leds-lp55xx.h>
22
23 #include "leds-lp55xx-common.h"
24
25 /* External clock rate */
26 #define LP55XX_CLK_32K 32768
27
cdev_to_lp55xx_led(struct led_classdev * cdev)28 static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
29 {
30 return container_of(cdev, struct lp55xx_led, cdev);
31 }
32
dev_to_lp55xx_led(struct device * dev)33 static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
34 {
35 return cdev_to_lp55xx_led(dev_get_drvdata(dev));
36 }
37
mcled_cdev_to_led(struct led_classdev_mc * mc_cdev)38 static struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev)
39 {
40 return container_of(mc_cdev, struct lp55xx_led, mc_cdev);
41 }
42
lp55xx_reset_device(struct lp55xx_chip * chip)43 static void lp55xx_reset_device(struct lp55xx_chip *chip)
44 {
45 struct lp55xx_device_config *cfg = chip->cfg;
46 u8 addr = cfg->reset.addr;
47 u8 val = cfg->reset.val;
48
49 /* no error checking here because no ACK from the device after reset */
50 lp55xx_write(chip, addr, val);
51 }
52
lp55xx_detect_device(struct lp55xx_chip * chip)53 static int lp55xx_detect_device(struct lp55xx_chip *chip)
54 {
55 struct lp55xx_device_config *cfg = chip->cfg;
56 u8 addr = cfg->enable.addr;
57 u8 val = cfg->enable.val;
58 int ret;
59
60 ret = lp55xx_write(chip, addr, val);
61 if (ret)
62 return ret;
63
64 usleep_range(1000, 2000);
65
66 ret = lp55xx_read(chip, addr, &val);
67 if (ret)
68 return ret;
69
70 if (val != cfg->enable.val)
71 return -ENODEV;
72
73 return 0;
74 }
75
lp55xx_post_init_device(struct lp55xx_chip * chip)76 static int lp55xx_post_init_device(struct lp55xx_chip *chip)
77 {
78 struct lp55xx_device_config *cfg = chip->cfg;
79
80 if (!cfg->post_init_device)
81 return 0;
82
83 return cfg->post_init_device(chip);
84 }
85
led_current_show(struct device * dev,struct device_attribute * attr,char * buf)86 static ssize_t led_current_show(struct device *dev,
87 struct device_attribute *attr,
88 char *buf)
89 {
90 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
91
92 return sysfs_emit(buf, "%d\n", led->led_current);
93 }
94
led_current_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)95 static ssize_t led_current_store(struct device *dev,
96 struct device_attribute *attr,
97 const char *buf, size_t len)
98 {
99 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
100 struct lp55xx_chip *chip = led->chip;
101 unsigned long curr;
102
103 if (kstrtoul(buf, 0, &curr))
104 return -EINVAL;
105
106 if (curr > led->max_current)
107 return -EINVAL;
108
109 if (!chip->cfg->set_led_current)
110 return len;
111
112 mutex_lock(&chip->lock);
113 chip->cfg->set_led_current(led, (u8)curr);
114 mutex_unlock(&chip->lock);
115
116 return len;
117 }
118
max_current_show(struct device * dev,struct device_attribute * attr,char * buf)119 static ssize_t max_current_show(struct device *dev,
120 struct device_attribute *attr,
121 char *buf)
122 {
123 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
124
125 return sysfs_emit(buf, "%d\n", led->max_current);
126 }
127
128 static DEVICE_ATTR_RW(led_current);
129 static DEVICE_ATTR_RO(max_current);
130
131 static struct attribute *lp55xx_led_attrs[] = {
132 &dev_attr_led_current.attr,
133 &dev_attr_max_current.attr,
134 NULL,
135 };
136 ATTRIBUTE_GROUPS(lp55xx_led);
137
lp55xx_set_mc_brightness(struct led_classdev * cdev,enum led_brightness brightness)138 static int lp55xx_set_mc_brightness(struct led_classdev *cdev,
139 enum led_brightness brightness)
140 {
141 struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev);
142 struct lp55xx_led *led = mcled_cdev_to_led(mc_dev);
143 struct lp55xx_device_config *cfg = led->chip->cfg;
144
145 led_mc_calc_color_components(&led->mc_cdev, brightness);
146 return cfg->multicolor_brightness_fn(led);
147
148 }
149
lp55xx_set_brightness(struct led_classdev * cdev,enum led_brightness brightness)150 static int lp55xx_set_brightness(struct led_classdev *cdev,
151 enum led_brightness brightness)
152 {
153 struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
154 struct lp55xx_device_config *cfg = led->chip->cfg;
155
156 led->brightness = (u8)brightness;
157 return cfg->brightness_fn(led);
158 }
159
lp55xx_init_led(struct lp55xx_led * led,struct lp55xx_chip * chip,int chan)160 static int lp55xx_init_led(struct lp55xx_led *led,
161 struct lp55xx_chip *chip, int chan)
162 {
163 struct lp55xx_platform_data *pdata = chip->pdata;
164 struct lp55xx_device_config *cfg = chip->cfg;
165 struct device *dev = &chip->cl->dev;
166 int max_channel = cfg->max_channel;
167 struct mc_subled *mc_led_info;
168 struct led_classdev *led_cdev;
169 char name[32];
170 int i;
171 int ret;
172
173 if (chan >= max_channel) {
174 dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
175 return -EINVAL;
176 }
177
178 if (pdata->led_config[chan].led_current == 0)
179 return 0;
180
181 if (pdata->led_config[chan].name) {
182 led->cdev.name = pdata->led_config[chan].name;
183 } else {
184 snprintf(name, sizeof(name), "%s:channel%d",
185 pdata->label ? : chip->cl->name, chan);
186 led->cdev.name = name;
187 }
188
189 if (pdata->led_config[chan].num_colors > 1) {
190 mc_led_info = devm_kcalloc(dev,
191 pdata->led_config[chan].num_colors,
192 sizeof(*mc_led_info), GFP_KERNEL);
193 if (!mc_led_info)
194 return -ENOMEM;
195
196 led_cdev = &led->mc_cdev.led_cdev;
197 led_cdev->name = led->cdev.name;
198 led_cdev->brightness_set_blocking = lp55xx_set_mc_brightness;
199 led->mc_cdev.num_colors = pdata->led_config[chan].num_colors;
200 for (i = 0; i < led->mc_cdev.num_colors; i++) {
201 mc_led_info[i].color_index =
202 pdata->led_config[chan].color_id[i];
203 mc_led_info[i].channel =
204 pdata->led_config[chan].output_num[i];
205 }
206
207 led->mc_cdev.subled_info = mc_led_info;
208 } else {
209 led->cdev.brightness_set_blocking = lp55xx_set_brightness;
210 }
211
212 led->cdev.groups = lp55xx_led_groups;
213 led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
214 led->led_current = pdata->led_config[chan].led_current;
215 led->max_current = pdata->led_config[chan].max_current;
216 led->chan_nr = pdata->led_config[chan].chan_nr;
217
218 if (led->chan_nr >= max_channel) {
219 dev_err(dev, "Use channel numbers between 0 and %d\n",
220 max_channel - 1);
221 return -EINVAL;
222 }
223
224 if (pdata->led_config[chan].num_colors > 1)
225 ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev);
226 else
227 ret = devm_led_classdev_register(dev, &led->cdev);
228
229 if (ret) {
230 dev_err(dev, "led register err: %d\n", ret);
231 return ret;
232 }
233
234 return 0;
235 }
236
lp55xx_firmware_loaded(const struct firmware * fw,void * context)237 static void lp55xx_firmware_loaded(const struct firmware *fw, void *context)
238 {
239 struct lp55xx_chip *chip = context;
240 struct device *dev = &chip->cl->dev;
241 enum lp55xx_engine_index idx = chip->engine_idx;
242
243 if (!fw) {
244 dev_err(dev, "firmware request failed\n");
245 return;
246 }
247
248 /* handling firmware data is chip dependent */
249 mutex_lock(&chip->lock);
250
251 chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
252 chip->fw = fw;
253 if (chip->cfg->firmware_cb)
254 chip->cfg->firmware_cb(chip);
255
256 mutex_unlock(&chip->lock);
257
258 /* firmware should be released for other channel use */
259 release_firmware(chip->fw);
260 chip->fw = NULL;
261 }
262
lp55xx_request_firmware(struct lp55xx_chip * chip)263 static int lp55xx_request_firmware(struct lp55xx_chip *chip)
264 {
265 const char *name = chip->cl->name;
266 struct device *dev = &chip->cl->dev;
267
268 return request_firmware_nowait(THIS_MODULE, false, name, dev,
269 GFP_KERNEL, chip, lp55xx_firmware_loaded);
270 }
271
select_engine_show(struct device * dev,struct device_attribute * attr,char * buf)272 static ssize_t select_engine_show(struct device *dev,
273 struct device_attribute *attr,
274 char *buf)
275 {
276 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
277 struct lp55xx_chip *chip = led->chip;
278
279 return sprintf(buf, "%d\n", chip->engine_idx);
280 }
281
select_engine_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)282 static ssize_t select_engine_store(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 int ret;
290
291 if (kstrtoul(buf, 0, &val))
292 return -EINVAL;
293
294 /* select the engine to be run */
295
296 switch (val) {
297 case LP55XX_ENGINE_1:
298 case LP55XX_ENGINE_2:
299 case LP55XX_ENGINE_3:
300 mutex_lock(&chip->lock);
301 chip->engine_idx = val;
302 ret = lp55xx_request_firmware(chip);
303 mutex_unlock(&chip->lock);
304 break;
305 default:
306 dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
307 return -EINVAL;
308 }
309
310 if (ret) {
311 dev_err(dev, "request firmware err: %d\n", ret);
312 return ret;
313 }
314
315 return len;
316 }
317
lp55xx_run_engine(struct lp55xx_chip * chip,bool start)318 static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
319 {
320 if (chip->cfg->run_engine)
321 chip->cfg->run_engine(chip, start);
322 }
323
run_engine_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)324 static ssize_t run_engine_store(struct device *dev,
325 struct device_attribute *attr,
326 const char *buf, size_t len)
327 {
328 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
329 struct lp55xx_chip *chip = led->chip;
330 unsigned long val;
331
332 if (kstrtoul(buf, 0, &val))
333 return -EINVAL;
334
335 /* run or stop the selected engine */
336
337 if (val <= 0) {
338 lp55xx_run_engine(chip, false);
339 return len;
340 }
341
342 mutex_lock(&chip->lock);
343 lp55xx_run_engine(chip, true);
344 mutex_unlock(&chip->lock);
345
346 return len;
347 }
348
349 static DEVICE_ATTR_RW(select_engine);
350 static DEVICE_ATTR_WO(run_engine);
351
352 static struct attribute *lp55xx_engine_attributes[] = {
353 &dev_attr_select_engine.attr,
354 &dev_attr_run_engine.attr,
355 NULL,
356 };
357
358 static const struct attribute_group lp55xx_engine_attr_group = {
359 .attrs = lp55xx_engine_attributes,
360 };
361
lp55xx_write(struct lp55xx_chip * chip,u8 reg,u8 val)362 int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
363 {
364 return i2c_smbus_write_byte_data(chip->cl, reg, val);
365 }
366 EXPORT_SYMBOL_GPL(lp55xx_write);
367
lp55xx_read(struct lp55xx_chip * chip,u8 reg,u8 * val)368 int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
369 {
370 s32 ret;
371
372 ret = i2c_smbus_read_byte_data(chip->cl, reg);
373 if (ret < 0)
374 return ret;
375
376 *val = ret;
377 return 0;
378 }
379 EXPORT_SYMBOL_GPL(lp55xx_read);
380
lp55xx_update_bits(struct lp55xx_chip * chip,u8 reg,u8 mask,u8 val)381 int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
382 {
383 int ret;
384 u8 tmp;
385
386 ret = lp55xx_read(chip, reg, &tmp);
387 if (ret)
388 return ret;
389
390 tmp &= ~mask;
391 tmp |= val & mask;
392
393 return lp55xx_write(chip, reg, tmp);
394 }
395 EXPORT_SYMBOL_GPL(lp55xx_update_bits);
396
lp55xx_is_extclk_used(struct lp55xx_chip * chip)397 bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
398 {
399 struct clk *clk;
400 int err;
401
402 clk = devm_clk_get(&chip->cl->dev, "32k_clk");
403 if (IS_ERR(clk))
404 goto use_internal_clk;
405
406 err = clk_prepare_enable(clk);
407 if (err)
408 goto use_internal_clk;
409
410 if (clk_get_rate(clk) != LP55XX_CLK_32K) {
411 clk_disable_unprepare(clk);
412 goto use_internal_clk;
413 }
414
415 dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K);
416
417 chip->clk = clk;
418 return true;
419
420 use_internal_clk:
421 dev_info(&chip->cl->dev, "internal clock used\n");
422 return false;
423 }
424 EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
425
lp55xx_init_device(struct lp55xx_chip * chip)426 int lp55xx_init_device(struct lp55xx_chip *chip)
427 {
428 struct lp55xx_platform_data *pdata;
429 struct lp55xx_device_config *cfg;
430 struct device *dev = &chip->cl->dev;
431 int ret = 0;
432
433 WARN_ON(!chip);
434
435 pdata = chip->pdata;
436 cfg = chip->cfg;
437
438 if (!pdata || !cfg)
439 return -EINVAL;
440
441 if (pdata->enable_gpiod) {
442 gpiod_direction_output(pdata->enable_gpiod, 0);
443
444 gpiod_set_consumer_name(pdata->enable_gpiod, "LP55xx enable");
445 gpiod_set_value(pdata->enable_gpiod, 0);
446 usleep_range(1000, 2000); /* Keep enable down at least 1ms */
447 gpiod_set_value(pdata->enable_gpiod, 1);
448 usleep_range(1000, 2000); /* 500us abs min. */
449 }
450
451 lp55xx_reset_device(chip);
452
453 /*
454 * Exact value is not available. 10 - 20ms
455 * appears to be enough for reset.
456 */
457 usleep_range(10000, 20000);
458
459 ret = lp55xx_detect_device(chip);
460 if (ret) {
461 dev_err(dev, "device detection err: %d\n", ret);
462 goto err;
463 }
464
465 /* chip specific initialization */
466 ret = lp55xx_post_init_device(chip);
467 if (ret) {
468 dev_err(dev, "post init device err: %d\n", ret);
469 goto err_post_init;
470 }
471
472 return 0;
473
474 err_post_init:
475 lp55xx_deinit_device(chip);
476 err:
477 return ret;
478 }
479 EXPORT_SYMBOL_GPL(lp55xx_init_device);
480
lp55xx_deinit_device(struct lp55xx_chip * chip)481 void lp55xx_deinit_device(struct lp55xx_chip *chip)
482 {
483 struct lp55xx_platform_data *pdata = chip->pdata;
484
485 if (chip->clk)
486 clk_disable_unprepare(chip->clk);
487
488 if (pdata->enable_gpiod)
489 gpiod_set_value(pdata->enable_gpiod, 0);
490 }
491 EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
492
lp55xx_register_leds(struct lp55xx_led * led,struct lp55xx_chip * chip)493 int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
494 {
495 struct lp55xx_platform_data *pdata = chip->pdata;
496 struct lp55xx_device_config *cfg = chip->cfg;
497 int num_channels = pdata->num_channels;
498 struct lp55xx_led *each;
499 u8 led_current;
500 int ret;
501 int i;
502
503 if (!cfg->brightness_fn) {
504 dev_err(&chip->cl->dev, "empty brightness configuration\n");
505 return -EINVAL;
506 }
507
508 for (i = 0; i < num_channels; i++) {
509
510 /* do not initialize channels that are not connected */
511 if (pdata->led_config[i].led_current == 0)
512 continue;
513
514 led_current = pdata->led_config[i].led_current;
515 each = led + i;
516 ret = lp55xx_init_led(each, chip, i);
517 if (ret)
518 goto err_init_led;
519
520 chip->num_leds++;
521 each->chip = chip;
522
523 /* setting led current at each channel */
524 if (cfg->set_led_current)
525 cfg->set_led_current(each, led_current);
526 }
527
528 return 0;
529
530 err_init_led:
531 return ret;
532 }
533 EXPORT_SYMBOL_GPL(lp55xx_register_leds);
534
lp55xx_register_sysfs(struct lp55xx_chip * chip)535 int lp55xx_register_sysfs(struct lp55xx_chip *chip)
536 {
537 struct device *dev = &chip->cl->dev;
538 struct lp55xx_device_config *cfg = chip->cfg;
539 int ret;
540
541 if (!cfg->run_engine || !cfg->firmware_cb)
542 goto dev_specific_attrs;
543
544 ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
545 if (ret)
546 return ret;
547
548 dev_specific_attrs:
549 return cfg->dev_attr_group ?
550 sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
551 }
552 EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
553
lp55xx_unregister_sysfs(struct lp55xx_chip * chip)554 void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
555 {
556 struct device *dev = &chip->cl->dev;
557 struct lp55xx_device_config *cfg = chip->cfg;
558
559 if (cfg->dev_attr_group)
560 sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
561
562 sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
563 }
564 EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
565
lp55xx_parse_common_child(struct device_node * np,struct lp55xx_led_config * cfg,int led_number,int * chan_nr)566 static int lp55xx_parse_common_child(struct device_node *np,
567 struct lp55xx_led_config *cfg,
568 int led_number, int *chan_nr)
569 {
570 int ret;
571
572 of_property_read_string(np, "chan-name",
573 &cfg[led_number].name);
574 of_property_read_u8(np, "led-cur",
575 &cfg[led_number].led_current);
576 of_property_read_u8(np, "max-cur",
577 &cfg[led_number].max_current);
578
579 ret = of_property_read_u32(np, "reg", chan_nr);
580 if (ret)
581 return ret;
582
583 return 0;
584 }
585
lp55xx_parse_multi_led_child(struct device_node * child,struct lp55xx_led_config * cfg,int child_number,int color_number)586 static int lp55xx_parse_multi_led_child(struct device_node *child,
587 struct lp55xx_led_config *cfg,
588 int child_number, int color_number)
589 {
590 int chan_nr, color_id, ret;
591
592 ret = lp55xx_parse_common_child(child, cfg, child_number, &chan_nr);
593 if (ret)
594 return ret;
595
596 ret = of_property_read_u32(child, "color", &color_id);
597 if (ret)
598 return ret;
599
600 cfg[child_number].color_id[color_number] = color_id;
601 cfg[child_number].output_num[color_number] = chan_nr;
602
603 return 0;
604 }
605
lp55xx_parse_multi_led(struct device_node * np,struct lp55xx_led_config * cfg,int child_number)606 static int lp55xx_parse_multi_led(struct device_node *np,
607 struct lp55xx_led_config *cfg,
608 int child_number)
609 {
610 struct device_node *child;
611 int num_colors = 0, ret;
612
613 for_each_available_child_of_node(np, child) {
614 ret = lp55xx_parse_multi_led_child(child, cfg, child_number,
615 num_colors);
616 if (ret) {
617 of_node_put(child);
618 return ret;
619 }
620 num_colors++;
621 }
622
623 cfg[child_number].num_colors = num_colors;
624
625 return 0;
626 }
627
lp55xx_parse_logical_led(struct device_node * np,struct lp55xx_led_config * cfg,int child_number)628 static int lp55xx_parse_logical_led(struct device_node *np,
629 struct lp55xx_led_config *cfg,
630 int child_number)
631 {
632 int led_color, ret;
633 int chan_nr = 0;
634
635 cfg[child_number].default_trigger =
636 of_get_property(np, "linux,default-trigger", NULL);
637
638 ret = of_property_read_u32(np, "color", &led_color);
639 if (ret)
640 return ret;
641
642 if (led_color == LED_COLOR_ID_RGB)
643 return lp55xx_parse_multi_led(np, cfg, child_number);
644
645 ret = lp55xx_parse_common_child(np, cfg, child_number, &chan_nr);
646 if (ret < 0)
647 return ret;
648
649 cfg[child_number].chan_nr = chan_nr;
650
651 return ret;
652 }
653
lp55xx_of_populate_pdata(struct device * dev,struct device_node * np,struct lp55xx_chip * chip)654 struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
655 struct device_node *np,
656 struct lp55xx_chip *chip)
657 {
658 struct device_node *child;
659 struct lp55xx_platform_data *pdata;
660 struct lp55xx_led_config *cfg;
661 int num_channels;
662 int i = 0;
663 int ret;
664
665 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
666 if (!pdata)
667 return ERR_PTR(-ENOMEM);
668
669 num_channels = of_get_available_child_count(np);
670 if (num_channels == 0) {
671 dev_err(dev, "no LED channels\n");
672 return ERR_PTR(-EINVAL);
673 }
674
675 cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL);
676 if (!cfg)
677 return ERR_PTR(-ENOMEM);
678
679 pdata->led_config = &cfg[0];
680 pdata->num_channels = num_channels;
681 cfg->max_channel = chip->cfg->max_channel;
682
683 for_each_available_child_of_node(np, child) {
684 ret = lp55xx_parse_logical_led(child, cfg, i);
685 if (ret) {
686 of_node_put(child);
687 return ERR_PTR(-EINVAL);
688 }
689 i++;
690 }
691
692 if (of_property_read_u32(np, "ti,charge-pump-mode", &pdata->charge_pump_mode))
693 pdata->charge_pump_mode = LP55XX_CP_AUTO;
694
695 if (pdata->charge_pump_mode > LP55XX_CP_AUTO) {
696 dev_err(dev, "invalid charge pump mode %d\n", pdata->charge_pump_mode);
697 return ERR_PTR(-EINVAL);
698 }
699
700 of_property_read_string(np, "label", &pdata->label);
701 of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
702
703 pdata->enable_gpiod = devm_gpiod_get_optional(dev, "enable",
704 GPIOD_ASIS);
705 if (IS_ERR(pdata->enable_gpiod))
706 return ERR_CAST(pdata->enable_gpiod);
707
708 /* LP8501 specific */
709 of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);
710
711 return pdata;
712 }
713 EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);
714
715 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
716 MODULE_DESCRIPTION("LP55xx Common Driver");
717 MODULE_LICENSE("GPL");
718