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