1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * leds-tca6507
4 *
5 * The TCA6507 is a programmable LED controller that can drive 7
6 * separate lines either by holding them low, or by pulsing them
7 * with modulated width.
8 * The modulation can be varied in a simple pattern to produce a
9 * blink or double-blink.
10 *
11 * This driver can configure each line either as a 'GPIO' which is
12 * out-only (pull-up resistor required) or as an LED with variable
13 * brightness and hardware-assisted blinking.
14 *
15 * Apart from OFF and ON there are three programmable brightness
16 * levels which can be programmed from 0 to 15 and indicate how many
17 * 500usec intervals in each 8msec that the led is 'on'. The levels
18 * are named MASTER, BANK0 and BANK1.
19 *
20 * There are two different blink rates that can be programmed, each
21 * with separate time for rise, on, fall, off and second-off. Thus if
22 * 3 or more different non-trivial rates are required, software must
23 * be used for the extra rates. The two different blink rates must
24 * align with the two levels BANK0 and BANK1. This driver does not
25 * support double-blink so 'second-off' always matches 'off'.
26 *
27 * Only 16 different times can be programmed in a roughly logarithmic
28 * scale from 64ms to 16320ms. To be precise the possible times are:
29 * 0, 64, 128, 192, 256, 384, 512, 768,
30 * 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
31 *
32 * Times that cannot be closely matched with these must be handled in
33 * software. This driver allows 12.5% error in matching.
34 *
35 * This driver does not allow rise/fall rates to be set explicitly.
36 * When trying to match a given 'on' or 'off' period, an appropriate
37 * pair of 'change' and 'hold' times are chosen to get a close match.
38 * If the target delay is even, the 'change' number will be the
39 * smaller; if odd, the 'hold' number will be the smaller.
40
41 * Choosing pairs of delays with 12.5% errors allows us to match
42 * delays in the ranges: 56-72, 112-144, 168-216, 224-27504,
43 * 28560-36720.
44 * 26% of the achievable sums can be matched by multiple pairings.
45 * For example 1536 == 1536+0, 1024+512, or 768+768.
46 * This driver will always choose the pairing with the least
47 * maximum - 768+768 in this case. Other pairings are not available.
48 *
49 * Access to the 3 levels and 2 blinks are on a first-come,
50 * first-served basis. Access can be shared by multiple leds if they
51 * have the same level and either same blink rates, or some don't
52 * blink. When a led changes, it relinquishes access and tries again,
53 * so it might lose access to hardware blink.
54 *
55 * If a blink engine cannot be allocated, software blink is used. If
56 * the desired brightness cannot be allocated, the closest available
57 * non-zero brightness is used. As 'full' is always available, the
58 * worst case would be to have two different blink rates at '1', with
59 * Max at '2', then other leds will have to choose between '2' and
60 * '16'. Hopefully this is not likely.
61 *
62 * Each bank (BANK0 and BANK1) has two usage counts - LEDs using the
63 * brightness and LEDs using the blink. It can only be reprogrammed
64 * when the appropriate counter is zero. The MASTER level has a
65 * single usage count.
66 *
67 * Each LED has programmable 'on' and 'off' time as milliseconds.
68 * With each there is a flag saying if it was explicitly requested or
69 * defaulted. Similarly the banks know if each time was explicit or a
70 * default. Defaults are permitted to be changed freely - they are
71 * not recognised when matching.
72 */
73
74 #include <linux/module.h>
75 #include <linux/slab.h>
76 #include <linux/leds.h>
77 #include <linux/err.h>
78 #include <linux/i2c.h>
79 #include <linux/gpio/driver.h>
80 #include <linux/property.h>
81 #include <linux/workqueue.h>
82
83 /* LED select registers determine the source that drives LED outputs */
84 #define TCA6507_LS_LED_OFF 0x0 /* Output HI-Z (off) */
85 #define TCA6507_LS_LED_OFF1 0x1 /* Output HI-Z (off) - not used */
86 #define TCA6507_LS_LED_PWM0 0x2 /* Output LOW with Bank0 rate */
87 #define TCA6507_LS_LED_PWM1 0x3 /* Output LOW with Bank1 rate */
88 #define TCA6507_LS_LED_ON 0x4 /* Output LOW (on) */
89 #define TCA6507_LS_LED_MIR 0x5 /* Output LOW with Master Intensity */
90 #define TCA6507_LS_BLINK0 0x6 /* Blink at Bank0 rate */
91 #define TCA6507_LS_BLINK1 0x7 /* Blink at Bank1 rate */
92
93 struct tca6507_platform_data {
94 struct led_platform_data leds;
95 #ifdef CONFIG_GPIOLIB
96 int gpio_base;
97 #endif
98 };
99
100 #define TCA6507_MAKE_GPIO 1
101
102 enum {
103 BANK0,
104 BANK1,
105 MASTER,
106 };
107 static int bank_source[3] = {
108 TCA6507_LS_LED_PWM0,
109 TCA6507_LS_LED_PWM1,
110 TCA6507_LS_LED_MIR,
111 };
112 static int blink_source[2] = {
113 TCA6507_LS_BLINK0,
114 TCA6507_LS_BLINK1,
115 };
116
117 /* PWM registers */
118 #define TCA6507_REG_CNT 11
119
120 /*
121 * 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output
122 * owns one bit in each register
123 */
124 #define TCA6507_FADE_ON 0x03
125 #define TCA6507_FULL_ON 0x04
126 #define TCA6507_FADE_OFF 0x05
127 #define TCA6507_FIRST_OFF 0x06
128 #define TCA6507_SECOND_OFF 0x07
129 #define TCA6507_MAX_INTENSITY 0x08
130 #define TCA6507_MASTER_INTENSITY 0x09
131 #define TCA6507_INITIALIZE 0x0A
132
133 #define INIT_CODE 0x8
134
135 #define TIMECODES 16
136 static int time_codes[TIMECODES] = {
137 0, 64, 128, 192, 256, 384, 512, 768,
138 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
139 };
140
141 /* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */
TO_LEVEL(int brightness)142 static inline int TO_LEVEL(int brightness)
143 {
144 return brightness >> 4;
145 }
146
147 /* ...and convert back */
TO_BRIGHT(int level)148 static inline int TO_BRIGHT(int level)
149 {
150 if (level)
151 return (level << 4) | 0xf;
152 return 0;
153 }
154
155 #define NUM_LEDS 7
156 struct tca6507_chip {
157 int reg_set; /* One bit per register where
158 * a '1' means the register
159 * should be written */
160 u8 reg_file[TCA6507_REG_CNT];
161 /* Bank 2 is Master Intensity and doesn't use times */
162 struct bank {
163 int level;
164 int ontime, offtime;
165 int on_dflt, off_dflt;
166 int time_use, level_use;
167 } bank[3];
168 struct i2c_client *client;
169 struct work_struct work;
170 spinlock_t lock;
171
172 struct tca6507_led {
173 struct tca6507_chip *chip;
174 struct led_classdev led_cdev;
175 int num;
176 int ontime, offtime;
177 int on_dflt, off_dflt;
178 int bank; /* Bank used, or -1 */
179 int blink; /* Set if hardware-blinking */
180 } leds[NUM_LEDS];
181 #ifdef CONFIG_GPIOLIB
182 struct gpio_chip gpio;
183 int gpio_map[NUM_LEDS];
184 #endif
185 };
186
187 static const struct i2c_device_id tca6507_id[] = {
188 { "tca6507" },
189 { }
190 };
191 MODULE_DEVICE_TABLE(i2c, tca6507_id);
192
choose_times(int msec,int * c1p,int * c2p)193 static int choose_times(int msec, int *c1p, int *c2p)
194 {
195 /*
196 * Choose two timecodes which add to 'msec' as near as
197 * possible. The first returned is the 'on' or 'off' time.
198 * The second is to be used as a 'fade-on' or 'fade-off' time.
199 * If 'msec' is even, the first will not be smaller than the
200 * second. If 'msec' is odd, the first will not be larger
201 * than the second.
202 * If we cannot get a sum within 1/8 of 'msec' fail with
203 * -EINVAL, otherwise return the sum that was achieved, plus 1
204 * if the first is smaller.
205 * If two possibilities are equally good (e.g. 512+0,
206 * 256+256), choose the first pair so there is more
207 * change-time visible (i.e. it is softer).
208 */
209 int c1, c2;
210 int tmax = msec * 9 / 8;
211 int tmin = msec * 7 / 8;
212 int diff = 65536;
213
214 /* We start at '1' to ensure we never even think of choosing a
215 * total time of '0'.
216 */
217 for (c1 = 1; c1 < TIMECODES; c1++) {
218 int t = time_codes[c1];
219 if (t*2 < tmin)
220 continue;
221 if (t > tmax)
222 break;
223 for (c2 = 0; c2 <= c1; c2++) {
224 int tt = t + time_codes[c2];
225 int d;
226 if (tt < tmin)
227 continue;
228 if (tt > tmax)
229 break;
230 /* This works! */
231 d = abs(msec - tt);
232 if (d >= diff)
233 continue;
234 /* Best yet */
235 *c1p = c1;
236 *c2p = c2;
237 diff = d;
238 if (d == 0)
239 return msec;
240 }
241 }
242 if (diff < 65536) {
243 int actual;
244 if (msec & 1) {
245 c1 = *c2p;
246 *c2p = *c1p;
247 *c1p = c1;
248 }
249 actual = time_codes[*c1p] + time_codes[*c2p];
250 if (*c1p < *c2p)
251 return actual + 1;
252 else
253 return actual;
254 }
255 /* No close match */
256 return -EINVAL;
257 }
258
259 /*
260 * Update the register file with the appropriate 3-bit state for the
261 * given led.
262 */
set_select(struct tca6507_chip * tca,int led,int val)263 static void set_select(struct tca6507_chip *tca, int led, int val)
264 {
265 int mask = (1 << led);
266 int bit;
267
268 for (bit = 0; bit < 3; bit++) {
269 int n = tca->reg_file[bit] & ~mask;
270 if (val & (1 << bit))
271 n |= mask;
272 if (tca->reg_file[bit] != n) {
273 tca->reg_file[bit] = n;
274 tca->reg_set |= (1 << bit);
275 }
276 }
277 }
278
279 /* Update the register file with the appropriate 4-bit code for one
280 * bank or other. This can be used for timers, for levels, or for
281 * initialization.
282 */
set_code(struct tca6507_chip * tca,int reg,int bank,int new)283 static void set_code(struct tca6507_chip *tca, int reg, int bank, int new)
284 {
285 int mask = 0xF;
286 int n;
287 if (bank) {
288 mask <<= 4;
289 new <<= 4;
290 }
291 n = tca->reg_file[reg] & ~mask;
292 n |= new;
293 if (tca->reg_file[reg] != n) {
294 tca->reg_file[reg] = n;
295 tca->reg_set |= 1 << reg;
296 }
297 }
298
299 /* Update brightness level. */
set_level(struct tca6507_chip * tca,int bank,int level)300 static void set_level(struct tca6507_chip *tca, int bank, int level)
301 {
302 switch (bank) {
303 case BANK0:
304 case BANK1:
305 set_code(tca, TCA6507_MAX_INTENSITY, bank, level);
306 break;
307 case MASTER:
308 set_code(tca, TCA6507_MASTER_INTENSITY, 0, level);
309 break;
310 }
311 tca->bank[bank].level = level;
312 }
313
314 /* Record all relevant time codes for a given bank */
set_times(struct tca6507_chip * tca,int bank)315 static void set_times(struct tca6507_chip *tca, int bank)
316 {
317 int c1, c2;
318 int result;
319
320 result = choose_times(tca->bank[bank].ontime, &c1, &c2);
321 if (result < 0)
322 return;
323 dev_dbg(&tca->client->dev,
324 "Chose on times %d(%d) %d(%d) for %dms\n",
325 c1, time_codes[c1],
326 c2, time_codes[c2], tca->bank[bank].ontime);
327 set_code(tca, TCA6507_FADE_ON, bank, c2);
328 set_code(tca, TCA6507_FULL_ON, bank, c1);
329 tca->bank[bank].ontime = result;
330
331 result = choose_times(tca->bank[bank].offtime, &c1, &c2);
332 dev_dbg(&tca->client->dev,
333 "Chose off times %d(%d) %d(%d) for %dms\n",
334 c1, time_codes[c1],
335 c2, time_codes[c2], tca->bank[bank].offtime);
336 set_code(tca, TCA6507_FADE_OFF, bank, c2);
337 set_code(tca, TCA6507_FIRST_OFF, bank, c1);
338 set_code(tca, TCA6507_SECOND_OFF, bank, c1);
339 tca->bank[bank].offtime = result;
340
341 set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE);
342 }
343
344 /* Write all needed register of tca6507 */
345
tca6507_work(struct work_struct * work)346 static void tca6507_work(struct work_struct *work)
347 {
348 struct tca6507_chip *tca = container_of(work, struct tca6507_chip,
349 work);
350 struct i2c_client *cl = tca->client;
351 int set;
352 u8 file[TCA6507_REG_CNT];
353 int r;
354
355 spin_lock_irq(&tca->lock);
356 set = tca->reg_set;
357 memcpy(file, tca->reg_file, TCA6507_REG_CNT);
358 tca->reg_set = 0;
359 spin_unlock_irq(&tca->lock);
360
361 for (r = 0; r < TCA6507_REG_CNT; r++)
362 if (set & (1<<r))
363 i2c_smbus_write_byte_data(cl, r, file[r]);
364 }
365
led_release(struct tca6507_led * led)366 static void led_release(struct tca6507_led *led)
367 {
368 /* If led owns any resource, release it. */
369 struct tca6507_chip *tca = led->chip;
370 if (led->bank >= 0) {
371 struct bank *b = tca->bank + led->bank;
372 if (led->blink)
373 b->time_use--;
374 b->level_use--;
375 }
376 led->blink = 0;
377 led->bank = -1;
378 }
379
led_prepare(struct tca6507_led * led)380 static int led_prepare(struct tca6507_led *led)
381 {
382 /* Assign this led to a bank, configuring that bank if
383 * necessary. */
384 int level = TO_LEVEL(led->led_cdev.brightness);
385 struct tca6507_chip *tca = led->chip;
386 int c1, c2;
387 int i;
388 struct bank *b;
389 int need_init = 0;
390
391 led->led_cdev.brightness = TO_BRIGHT(level);
392 if (level == 0) {
393 set_select(tca, led->num, TCA6507_LS_LED_OFF);
394 return 0;
395 }
396
397 if (led->ontime == 0 || led->offtime == 0) {
398 /*
399 * Just set the brightness, choosing first usable
400 * bank. If none perfect, choose best. Count
401 * backwards so we check MASTER bank first to avoid
402 * wasting a timer.
403 */
404 int best = -1;/* full-on */
405 int diff = 15-level;
406
407 if (level == 15) {
408 set_select(tca, led->num, TCA6507_LS_LED_ON);
409 return 0;
410 }
411
412 for (i = MASTER; i >= BANK0; i--) {
413 int d;
414 if (tca->bank[i].level == level ||
415 tca->bank[i].level_use == 0) {
416 best = i;
417 break;
418 }
419 d = abs(level - tca->bank[i].level);
420 if (d < diff) {
421 diff = d;
422 best = i;
423 }
424 }
425 if (best == -1) {
426 /* Best brightness is full-on */
427 set_select(tca, led->num, TCA6507_LS_LED_ON);
428 led->led_cdev.brightness = LED_FULL;
429 return 0;
430 }
431
432 if (!tca->bank[best].level_use)
433 set_level(tca, best, level);
434
435 tca->bank[best].level_use++;
436 led->bank = best;
437 set_select(tca, led->num, bank_source[best]);
438 led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level);
439 return 0;
440 }
441
442 /*
443 * We have on/off time so we need to try to allocate a timing
444 * bank. First check if times are compatible with hardware
445 * and give up if not.
446 */
447 if (choose_times(led->ontime, &c1, &c2) < 0)
448 return -EINVAL;
449 if (choose_times(led->offtime, &c1, &c2) < 0)
450 return -EINVAL;
451
452 for (i = BANK0; i <= BANK1; i++) {
453 if (tca->bank[i].level_use == 0)
454 /* not in use - it is ours! */
455 break;
456 if (tca->bank[i].level != level)
457 /* Incompatible level - skip */
458 /* FIX: if timer matches we maybe should consider
459 * this anyway...
460 */
461 continue;
462
463 if (tca->bank[i].time_use == 0)
464 /* Timer not in use, and level matches - use it */
465 break;
466
467 if (!(tca->bank[i].on_dflt ||
468 led->on_dflt ||
469 tca->bank[i].ontime == led->ontime))
470 /* on time is incompatible */
471 continue;
472
473 if (!(tca->bank[i].off_dflt ||
474 led->off_dflt ||
475 tca->bank[i].offtime == led->offtime))
476 /* off time is incompatible */
477 continue;
478
479 /* looks like a suitable match */
480 break;
481 }
482
483 if (i > BANK1)
484 /* Nothing matches - how sad */
485 return -EINVAL;
486
487 b = &tca->bank[i];
488 if (b->level_use == 0)
489 set_level(tca, i, level);
490 b->level_use++;
491 led->bank = i;
492
493 if (b->on_dflt ||
494 !led->on_dflt ||
495 b->time_use == 0) {
496 b->ontime = led->ontime;
497 b->on_dflt = led->on_dflt;
498 need_init = 1;
499 }
500
501 if (b->off_dflt ||
502 !led->off_dflt ||
503 b->time_use == 0) {
504 b->offtime = led->offtime;
505 b->off_dflt = led->off_dflt;
506 need_init = 1;
507 }
508
509 if (need_init)
510 set_times(tca, i);
511
512 led->ontime = b->ontime;
513 led->offtime = b->offtime;
514
515 b->time_use++;
516 led->blink = 1;
517 led->led_cdev.brightness = TO_BRIGHT(b->level);
518 set_select(tca, led->num, blink_source[i]);
519 return 0;
520 }
521
led_assign(struct tca6507_led * led)522 static int led_assign(struct tca6507_led *led)
523 {
524 struct tca6507_chip *tca = led->chip;
525 int err;
526 unsigned long flags;
527
528 spin_lock_irqsave(&tca->lock, flags);
529 led_release(led);
530 err = led_prepare(led);
531 if (err) {
532 /*
533 * Can only fail on timer setup. In that case we need
534 * to re-establish as steady level.
535 */
536 led->ontime = 0;
537 led->offtime = 0;
538 led_prepare(led);
539 }
540 spin_unlock_irqrestore(&tca->lock, flags);
541
542 if (tca->reg_set)
543 schedule_work(&tca->work);
544 return err;
545 }
546
tca6507_brightness_set(struct led_classdev * led_cdev,enum led_brightness brightness)547 static void tca6507_brightness_set(struct led_classdev *led_cdev,
548 enum led_brightness brightness)
549 {
550 struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
551 led_cdev);
552 led->led_cdev.brightness = brightness;
553 led->ontime = 0;
554 led->offtime = 0;
555 led_assign(led);
556 }
557
tca6507_blink_set(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)558 static int tca6507_blink_set(struct led_classdev *led_cdev,
559 unsigned long *delay_on,
560 unsigned long *delay_off)
561 {
562 struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
563 led_cdev);
564
565 if (*delay_on == 0)
566 led->on_dflt = 1;
567 else if (delay_on != &led_cdev->blink_delay_on)
568 led->on_dflt = 0;
569 led->ontime = *delay_on;
570
571 if (*delay_off == 0)
572 led->off_dflt = 1;
573 else if (delay_off != &led_cdev->blink_delay_off)
574 led->off_dflt = 0;
575 led->offtime = *delay_off;
576
577 if (led->ontime == 0)
578 led->ontime = 512;
579 if (led->offtime == 0)
580 led->offtime = 512;
581
582 if (led->led_cdev.brightness == LED_OFF)
583 led->led_cdev.brightness = LED_FULL;
584 if (led_assign(led) < 0) {
585 led->ontime = 0;
586 led->offtime = 0;
587 led->led_cdev.brightness = LED_OFF;
588 return -EINVAL;
589 }
590 *delay_on = led->ontime;
591 *delay_off = led->offtime;
592 return 0;
593 }
594
595 #ifdef CONFIG_GPIOLIB
tca6507_gpio_set_value(struct gpio_chip * gc,unsigned offset,int val)596 static void tca6507_gpio_set_value(struct gpio_chip *gc,
597 unsigned offset, int val)
598 {
599 struct tca6507_chip *tca = gpiochip_get_data(gc);
600 unsigned long flags;
601
602 spin_lock_irqsave(&tca->lock, flags);
603 /*
604 * 'OFF' is floating high, and 'ON' is pulled down, so it has
605 * the inverse sense of 'val'.
606 */
607 set_select(tca, tca->gpio_map[offset],
608 val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON);
609 spin_unlock_irqrestore(&tca->lock, flags);
610 if (tca->reg_set)
611 schedule_work(&tca->work);
612 }
613
tca6507_gpio_direction_output(struct gpio_chip * gc,unsigned offset,int val)614 static int tca6507_gpio_direction_output(struct gpio_chip *gc,
615 unsigned offset, int val)
616 {
617 tca6507_gpio_set_value(gc, offset, val);
618 return 0;
619 }
620
tca6507_probe_gpios(struct device * dev,struct tca6507_chip * tca,struct tca6507_platform_data * pdata)621 static int tca6507_probe_gpios(struct device *dev,
622 struct tca6507_chip *tca,
623 struct tca6507_platform_data *pdata)
624 {
625 int err;
626 int i = 0;
627 int gpios = 0;
628
629 for (i = 0; i < NUM_LEDS; i++)
630 if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) {
631 /* Configure as a gpio */
632 tca->gpio_map[gpios] = i;
633 gpios++;
634 }
635
636 if (!gpios)
637 return 0;
638
639 tca->gpio.label = "gpio-tca6507";
640 tca->gpio.ngpio = gpios;
641 tca->gpio.base = pdata->gpio_base;
642 tca->gpio.owner = THIS_MODULE;
643 tca->gpio.direction_output = tca6507_gpio_direction_output;
644 tca->gpio.set = tca6507_gpio_set_value;
645 tca->gpio.parent = dev;
646 #ifdef CONFIG_OF_GPIO
647 tca->gpio.of_node = of_node_get(dev_of_node(dev));
648 #endif
649 err = gpiochip_add_data(&tca->gpio, tca);
650 if (err) {
651 tca->gpio.ngpio = 0;
652 return err;
653 }
654 return 0;
655 }
656
tca6507_remove_gpio(struct tca6507_chip * tca)657 static void tca6507_remove_gpio(struct tca6507_chip *tca)
658 {
659 if (tca->gpio.ngpio)
660 gpiochip_remove(&tca->gpio);
661 }
662 #else /* CONFIG_GPIOLIB */
tca6507_probe_gpios(struct device * dev,struct tca6507_chip * tca,struct tca6507_platform_data * pdata)663 static int tca6507_probe_gpios(struct device *dev,
664 struct tca6507_chip *tca,
665 struct tca6507_platform_data *pdata)
666 {
667 return 0;
668 }
tca6507_remove_gpio(struct tca6507_chip * tca)669 static void tca6507_remove_gpio(struct tca6507_chip *tca)
670 {
671 }
672 #endif /* CONFIG_GPIOLIB */
673
674 static struct tca6507_platform_data *
tca6507_led_dt_init(struct device * dev)675 tca6507_led_dt_init(struct device *dev)
676 {
677 struct tca6507_platform_data *pdata;
678 struct fwnode_handle *child;
679 struct led_info *tca_leds;
680 int count;
681
682 count = device_get_child_node_count(dev);
683 if (!count || count > NUM_LEDS)
684 return ERR_PTR(-ENODEV);
685
686 tca_leds = devm_kcalloc(dev, NUM_LEDS, sizeof(struct led_info),
687 GFP_KERNEL);
688 if (!tca_leds)
689 return ERR_PTR(-ENOMEM);
690
691 device_for_each_child_node(dev, child) {
692 struct led_info led;
693 u32 reg;
694 int ret;
695
696 if (fwnode_property_read_string(child, "label", &led.name))
697 led.name = fwnode_get_name(child);
698
699 fwnode_property_read_string(child, "linux,default-trigger",
700 &led.default_trigger);
701
702 led.flags = 0;
703 if (fwnode_property_match_string(child, "compatible",
704 "gpio") >= 0)
705 led.flags |= TCA6507_MAKE_GPIO;
706
707 ret = fwnode_property_read_u32(child, "reg", ®);
708 if (ret || reg >= NUM_LEDS) {
709 fwnode_handle_put(child);
710 return ERR_PTR(ret ? : -EINVAL);
711 }
712
713 tca_leds[reg] = led;
714 }
715
716 pdata = devm_kzalloc(dev, sizeof(struct tca6507_platform_data),
717 GFP_KERNEL);
718 if (!pdata)
719 return ERR_PTR(-ENOMEM);
720
721 pdata->leds.leds = tca_leds;
722 pdata->leds.num_leds = NUM_LEDS;
723 #ifdef CONFIG_GPIOLIB
724 pdata->gpio_base = -1;
725 #endif
726
727 return pdata;
728 }
729
730 static const struct of_device_id __maybe_unused of_tca6507_leds_match[] = {
731 { .compatible = "ti,tca6507", },
732 {},
733 };
734 MODULE_DEVICE_TABLE(of, of_tca6507_leds_match);
735
tca6507_probe(struct i2c_client * client,const struct i2c_device_id * id)736 static int tca6507_probe(struct i2c_client *client,
737 const struct i2c_device_id *id)
738 {
739 struct device *dev = &client->dev;
740 struct i2c_adapter *adapter;
741 struct tca6507_chip *tca;
742 struct tca6507_platform_data *pdata;
743 int err;
744 int i = 0;
745
746 adapter = client->adapter;
747
748 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
749 return -EIO;
750
751 pdata = tca6507_led_dt_init(dev);
752 if (IS_ERR(pdata)) {
753 dev_err(dev, "Need %d entries in platform-data list\n", NUM_LEDS);
754 return PTR_ERR(pdata);
755 }
756 tca = devm_kzalloc(dev, sizeof(*tca), GFP_KERNEL);
757 if (!tca)
758 return -ENOMEM;
759
760 tca->client = client;
761 INIT_WORK(&tca->work, tca6507_work);
762 spin_lock_init(&tca->lock);
763 i2c_set_clientdata(client, tca);
764
765 for (i = 0; i < NUM_LEDS; i++) {
766 struct tca6507_led *l = tca->leds + i;
767
768 l->chip = tca;
769 l->num = i;
770 if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) {
771 l->led_cdev.name = pdata->leds.leds[i].name;
772 l->led_cdev.default_trigger
773 = pdata->leds.leds[i].default_trigger;
774 l->led_cdev.brightness_set = tca6507_brightness_set;
775 l->led_cdev.blink_set = tca6507_blink_set;
776 l->bank = -1;
777 err = led_classdev_register(dev, &l->led_cdev);
778 if (err < 0)
779 goto exit;
780 }
781 }
782 err = tca6507_probe_gpios(dev, tca, pdata);
783 if (err)
784 goto exit;
785 /* set all registers to known state - zero */
786 tca->reg_set = 0x7f;
787 schedule_work(&tca->work);
788
789 return 0;
790 exit:
791 while (i--) {
792 if (tca->leds[i].led_cdev.name)
793 led_classdev_unregister(&tca->leds[i].led_cdev);
794 }
795 return err;
796 }
797
tca6507_remove(struct i2c_client * client)798 static int tca6507_remove(struct i2c_client *client)
799 {
800 int i;
801 struct tca6507_chip *tca = i2c_get_clientdata(client);
802 struct tca6507_led *tca_leds = tca->leds;
803
804 for (i = 0; i < NUM_LEDS; i++) {
805 if (tca_leds[i].led_cdev.name)
806 led_classdev_unregister(&tca_leds[i].led_cdev);
807 }
808 tca6507_remove_gpio(tca);
809 cancel_work_sync(&tca->work);
810
811 return 0;
812 }
813
814 static struct i2c_driver tca6507_driver = {
815 .driver = {
816 .name = "leds-tca6507",
817 .of_match_table = of_match_ptr(of_tca6507_leds_match),
818 },
819 .probe = tca6507_probe,
820 .remove = tca6507_remove,
821 .id_table = tca6507_id,
822 };
823
824 module_i2c_driver(tca6507_driver);
825
826 MODULE_AUTHOR("NeilBrown <neilb@suse.de>");
827 MODULE_DESCRIPTION("TCA6507 LED/GPO driver");
828 MODULE_LICENSE("GPL v2");
829