1
2
3
4
5
6
7
8
9
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
22#include "leds-lp55xx-common.h"
23
24
25#define LP55XX_CLK_32K 32768
26
27static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
28{
29 return container_of(cdev, struct lp55xx_led, cdev);
30}
31
32static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
33{
34 return cdev_to_lp55xx_led(dev_get_drvdata(dev));
35}
36
37static struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev)
38{
39 return container_of(mc_cdev, struct lp55xx_led, mc_cdev);
40}
41
42static void lp55xx_reset_device(struct lp55xx_chip *chip)
43{
44 struct lp55xx_device_config *cfg = chip->cfg;
45 u8 addr = cfg->reset.addr;
46 u8 val = cfg->reset.val;
47
48
49 lp55xx_write(chip, addr, val);
50}
51
52static int lp55xx_detect_device(struct lp55xx_chip *chip)
53{
54 struct lp55xx_device_config *cfg = chip->cfg;
55 u8 addr = cfg->enable.addr;
56 u8 val = cfg->enable.val;
57 int ret;
58
59 ret = lp55xx_write(chip, addr, val);
60 if (ret)
61 return ret;
62
63 usleep_range(1000, 2000);
64
65 ret = lp55xx_read(chip, addr, &val);
66 if (ret)
67 return ret;
68
69 if (val != cfg->enable.val)
70 return -ENODEV;
71
72 return 0;
73}
74
75static int lp55xx_post_init_device(struct lp55xx_chip *chip)
76{
77 struct lp55xx_device_config *cfg = chip->cfg;
78
79 if (!cfg->post_init_device)
80 return 0;
81
82 return cfg->post_init_device(chip);
83}
84
85static ssize_t led_current_show(struct device *dev,
86 struct device_attribute *attr,
87 char *buf)
88{
89 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
90
91 return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current);
92}
93
94static ssize_t led_current_store(struct device *dev,
95 struct device_attribute *attr,
96 const char *buf, size_t len)
97{
98 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
99 struct lp55xx_chip *chip = led->chip;
100 unsigned long curr;
101
102 if (kstrtoul(buf, 0, &curr))
103 return -EINVAL;
104
105 if (curr > led->max_current)
106 return -EINVAL;
107
108 if (!chip->cfg->set_led_current)
109 return len;
110
111 mutex_lock(&chip->lock);
112 chip->cfg->set_led_current(led, (u8)curr);
113 mutex_unlock(&chip->lock);
114
115 return len;
116}
117
118static ssize_t max_current_show(struct device *dev,
119 struct device_attribute *attr,
120 char *buf)
121{
122 struct lp55xx_led *led = dev_to_lp55xx_led(dev);
123
124 return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current);
125}
126
127static DEVICE_ATTR_RW(led_current);
128static DEVICE_ATTR_RO(max_current);
129
130static struct attribute *lp55xx_led_attrs[] = {
131 &dev_attr_led_current.attr,
132 &dev_attr_max_current.attr,
133 NULL,
134};
135ATTRIBUTE_GROUPS(lp55xx_led);
136
137static int lp55xx_set_mc_brightness(struct led_classdev *cdev,
138 enum led_brightness brightness)
139{
140 struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev);
141 struct lp55xx_led *led = mcled_cdev_to_led(mc_dev);
142 struct lp55xx_device_config *cfg = led->chip->cfg;
143
144 led_mc_calc_color_components(&led->mc_cdev, brightness);
145 return cfg->multicolor_brightness_fn(led);
146
147}
148
149static int lp55xx_set_brightness(struct led_classdev *cdev,
150 enum led_brightness brightness)
151{
152 struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
153 struct lp55xx_device_config *cfg = led->chip->cfg;
154
155 led->brightness = (u8)brightness;
156 return cfg->brightness_fn(led);
157}
158
159static int lp55xx_init_led(struct lp55xx_led *led,
160 struct lp55xx_chip *chip, int chan)
161{
162 struct lp55xx_platform_data *pdata = chip->pdata;
163 struct lp55xx_device_config *cfg = chip->cfg;
164 struct device *dev = &chip->cl->dev;
165 int max_channel = cfg->max_channel;
166 struct mc_subled *mc_led_info;
167 struct led_classdev *led_cdev;
168 char name[32];
169 int i, j = 0;
170 int ret;
171
172 if (chan >= max_channel) {
173 dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
174 return -EINVAL;
175 }
176
177 if (pdata->led_config[chan].led_current == 0)
178 return 0;
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 if (pdata->led_config[chan].num_colors > 1) {
189 mc_led_info = devm_kcalloc(dev,
190 pdata->led_config[chan].num_colors,
191 sizeof(*mc_led_info), GFP_KERNEL);
192 if (!mc_led_info)
193 return -ENOMEM;
194
195 led_cdev = &led->mc_cdev.led_cdev;
196 led_cdev->name = led->cdev.name;
197 led_cdev->brightness_set_blocking = lp55xx_set_mc_brightness;
198 led->mc_cdev.num_colors = pdata->led_config[chan].num_colors;
199 for (i = 0; i < led->mc_cdev.num_colors; i++) {
200 mc_led_info[i].color_index =
201 pdata->led_config[chan].color_id[i];
202 mc_led_info[i].channel =
203 pdata->led_config[chan].output_num[i];
204 j++;
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
237static 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
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
259 release_firmware(chip->fw);
260 chip->fw = NULL;
261}
262
263static 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
272static 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
282static 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
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
318static 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
324static 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
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
349static DEVICE_ATTR_RW(select_engine);
350static DEVICE_ATTR_WO(run_engine);
351
352static struct attribute *lp55xx_engine_attributes[] = {
353 &dev_attr_select_engine.attr,
354 &dev_attr_run_engine.attr,
355 NULL,
356};
357
358static const struct attribute_group lp55xx_engine_attr_group = {
359 .attrs = lp55xx_engine_attributes,
360};
361
362int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
363{
364 return i2c_smbus_write_byte_data(chip->cl, reg, val);
365}
366EXPORT_SYMBOL_GPL(lp55xx_write);
367
368int 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}
379EXPORT_SYMBOL_GPL(lp55xx_read);
380
381int 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}
395EXPORT_SYMBOL_GPL(lp55xx_update_bits);
396
397bool 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
420use_internal_clk:
421 dev_info(&chip->cl->dev, "internal clock used\n");
422 return false;
423}
424EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
425
426int 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_set_consumer_name(pdata->enable_gpiod, "LP55xx enable");
443 gpiod_set_value(pdata->enable_gpiod, 0);
444 usleep_range(1000, 2000);
445 gpiod_set_value(pdata->enable_gpiod, 1);
446 usleep_range(1000, 2000);
447 }
448
449 lp55xx_reset_device(chip);
450
451
452
453
454
455 usleep_range(10000, 20000);
456
457 ret = lp55xx_detect_device(chip);
458 if (ret) {
459 dev_err(dev, "device detection err: %d\n", ret);
460 goto err;
461 }
462
463
464 ret = lp55xx_post_init_device(chip);
465 if (ret) {
466 dev_err(dev, "post init device err: %d\n", ret);
467 goto err_post_init;
468 }
469
470 return 0;
471
472err_post_init:
473 lp55xx_deinit_device(chip);
474err:
475 return ret;
476}
477EXPORT_SYMBOL_GPL(lp55xx_init_device);
478
479void lp55xx_deinit_device(struct lp55xx_chip *chip)
480{
481 struct lp55xx_platform_data *pdata = chip->pdata;
482
483 if (chip->clk)
484 clk_disable_unprepare(chip->clk);
485
486 if (pdata->enable_gpiod)
487 gpiod_set_value(pdata->enable_gpiod, 0);
488}
489EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
490
491int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
492{
493 struct lp55xx_platform_data *pdata = chip->pdata;
494 struct lp55xx_device_config *cfg = chip->cfg;
495 int num_channels = pdata->num_channels;
496 struct lp55xx_led *each;
497 u8 led_current;
498 int ret;
499 int i;
500
501 if (!cfg->brightness_fn) {
502 dev_err(&chip->cl->dev, "empty brightness configuration\n");
503 return -EINVAL;
504 }
505
506 for (i = 0; i < num_channels; i++) {
507
508
509 if (pdata->led_config[i].led_current == 0)
510 continue;
511
512 led_current = pdata->led_config[i].led_current;
513 each = led + i;
514 ret = lp55xx_init_led(each, chip, i);
515 if (ret)
516 goto err_init_led;
517
518 chip->num_leds++;
519 each->chip = chip;
520
521
522 if (cfg->set_led_current)
523 cfg->set_led_current(each, led_current);
524 }
525
526 return 0;
527
528err_init_led:
529 return ret;
530}
531EXPORT_SYMBOL_GPL(lp55xx_register_leds);
532
533int lp55xx_register_sysfs(struct lp55xx_chip *chip)
534{
535 struct device *dev = &chip->cl->dev;
536 struct lp55xx_device_config *cfg = chip->cfg;
537 int ret;
538
539 if (!cfg->run_engine || !cfg->firmware_cb)
540 goto dev_specific_attrs;
541
542 ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
543 if (ret)
544 return ret;
545
546dev_specific_attrs:
547 return cfg->dev_attr_group ?
548 sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
549}
550EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
551
552void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
553{
554 struct device *dev = &chip->cl->dev;
555 struct lp55xx_device_config *cfg = chip->cfg;
556
557 if (cfg->dev_attr_group)
558 sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
559
560 sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
561}
562EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
563
564static int lp55xx_parse_common_child(struct device_node *np,
565 struct lp55xx_led_config *cfg,
566 int led_number, int *chan_nr)
567{
568 int ret;
569
570 of_property_read_string(np, "chan-name",
571 &cfg[led_number].name);
572 of_property_read_u8(np, "led-cur",
573 &cfg[led_number].led_current);
574 of_property_read_u8(np, "max-cur",
575 &cfg[led_number].max_current);
576
577 ret = of_property_read_u32(np, "reg", chan_nr);
578 if (ret)
579 return ret;
580
581 if (*chan_nr < 0 || *chan_nr > cfg->max_channel)
582 return -EINVAL;
583
584 return 0;
585}
586
587static int lp55xx_parse_multi_led_child(struct device_node *child,
588 struct lp55xx_led_config *cfg,
589 int child_number, int color_number)
590{
591 int chan_nr, color_id, ret;
592
593 ret = lp55xx_parse_common_child(child, cfg, child_number, &chan_nr);
594 if (ret)
595 return ret;
596
597 ret = of_property_read_u32(child, "color", &color_id);
598 if (ret)
599 return ret;
600
601 cfg[child_number].color_id[color_number] = color_id;
602 cfg[child_number].output_num[color_number] = chan_nr;
603
604 return 0;
605}
606
607static int lp55xx_parse_multi_led(struct device_node *np,
608 struct lp55xx_led_config *cfg,
609 int child_number)
610{
611 struct device_node *child;
612 int num_colors = 0, ret;
613
614 for_each_available_child_of_node(np, child) {
615 ret = lp55xx_parse_multi_led_child(child, cfg, child_number,
616 num_colors);
617 if (ret) {
618 of_node_put(child);
619 return ret;
620 }
621 num_colors++;
622 }
623
624 cfg[child_number].num_colors = num_colors;
625
626 return 0;
627}
628
629static int lp55xx_parse_logical_led(struct device_node *np,
630 struct lp55xx_led_config *cfg,
631 int child_number)
632{
633 int led_color, ret;
634 int chan_nr = 0;
635
636 cfg[child_number].default_trigger =
637 of_get_property(np, "linux,default-trigger", NULL);
638
639 ret = of_property_read_u32(np, "color", &led_color);
640 if (ret)
641 return ret;
642
643 if (led_color == LED_COLOR_ID_RGB)
644 return lp55xx_parse_multi_led(np, cfg, child_number);
645
646 ret = lp55xx_parse_common_child(np, cfg, child_number, &chan_nr);
647 if (ret < 0)
648 return ret;
649
650 cfg[child_number].chan_nr = chan_nr;
651
652 return ret;
653}
654
655struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev,
656 struct device_node *np,
657 struct lp55xx_chip *chip)
658{
659 struct device_node *child;
660 struct lp55xx_platform_data *pdata;
661 struct lp55xx_led_config *cfg;
662 int num_channels;
663 int i = 0;
664 int ret;
665
666 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
667 if (!pdata)
668 return ERR_PTR(-ENOMEM);
669
670 num_channels = of_get_available_child_count(np);
671 if (num_channels == 0) {
672 dev_err(dev, "no LED channels\n");
673 return ERR_PTR(-EINVAL);
674 }
675
676 cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL);
677 if (!cfg)
678 return ERR_PTR(-ENOMEM);
679
680 pdata->led_config = &cfg[0];
681 pdata->num_channels = num_channels;
682 cfg->max_channel = chip->cfg->max_channel;
683
684 for_each_available_child_of_node(np, child) {
685 ret = lp55xx_parse_logical_led(child, cfg, i);
686 if (ret) {
687 of_node_put(child);
688 return ERR_PTR(-EINVAL);
689 }
690 i++;
691 }
692
693 of_property_read_string(np, "label", &pdata->label);
694 of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
695
696 pdata->enable_gpiod = devm_gpiod_get_optional(dev, "enable",
697 GPIOD_OUT_LOW);
698 if (IS_ERR(pdata->enable_gpiod))
699 return ERR_CAST(pdata->enable_gpiod);
700
701
702 of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);
703
704 return pdata;
705}
706EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);
707
708MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
709MODULE_DESCRIPTION("LP55xx Common Driver");
710MODULE_LICENSE("GPL");
711
