Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a6d511e5 N |
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. | |
1f431afd N |
8 | * The modulation can be varied in a simple pattern to produce a |
9 | * blink or double-blink. | |
a6d511e5 | 10 | * |
1f431afd N |
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. | |
a6d511e5 | 14 | * |
1f431afd N |
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. | |
a6d511e5 | 19 | * |
1f431afd N |
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'. | |
a6d511e5 | 26 | * |
1f431afd N |
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: | |
a6d511e5 N |
29 | * 0, 64, 128, 192, 256, 384, 512, 768, |
30 | * 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320 | |
31 | * | |
1f431afd N |
32 | * Times that cannot be closely matched with these must be handled in |
33 | * software. This driver allows 12.5% error in matching. | |
a6d511e5 | 34 | * |
1f431afd N |
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. | |
a6d511e5 | 48 | * |
1f431afd N |
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. | |
a6d511e5 | 54 | * |
1f431afd N |
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. | |
a6d511e5 | 61 | * |
1f431afd N |
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. | |
a6d511e5 | 66 | * |
1f431afd N |
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. | |
a6d511e5 N |
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> | |
ca995226 | 79 | #include <linux/gpio/driver.h> |
96f52410 | 80 | #include <linux/property.h> |
a6d511e5 | 81 | #include <linux/workqueue.h> |
a6d511e5 N |
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 | ||
38b393fe MB |
93 | struct tca6507_platform_data { |
94 | struct led_platform_data leds; | |
95 | #ifdef CONFIG_GPIOLIB | |
96 | int gpio_base; | |
38b393fe MB |
97 | #endif |
98 | }; | |
99 | ||
100 | #define TCA6507_MAKE_GPIO 1 | |
101 | ||
a6d511e5 N |
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) */ | |
142 | static inline int TO_LEVEL(int brightness) | |
143 | { | |
144 | return brightness >> 4; | |
145 | } | |
146 | ||
147 | /* ...and convert back */ | |
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; | |
a6d511e5 N |
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 | ||
193 | static int choose_times(int msec, int *c1p, int *c2p) | |
194 | { | |
195 | /* | |
1f431afd N |
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). | |
a6d511e5 N |
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 | /* | |
1f431afd N |
260 | * Update the register file with the appropriate 3-bit state for the |
261 | * given led. | |
a6d511e5 N |
262 | */ |
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 | ||
1f431afd N |
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. | |
a6d511e5 N |
282 | */ |
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. */ | |
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 | ||
1f431afd | 314 | /* Record all relevant time codes for a given bank */ |
a6d511e5 N |
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); | |
4a91c45e DC |
321 | if (result < 0) |
322 | return; | |
a6d511e5 | 323 | dev_dbg(&tca->client->dev, |
1f431afd N |
324 | "Chose on times %d(%d) %d(%d) for %dms\n", |
325 | c1, time_codes[c1], | |
a6d511e5 N |
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, | |
1f431afd N |
333 | "Chose off times %d(%d) %d(%d) for %dms\n", |
334 | c1, time_codes[c1], | |
a6d511e5 N |
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 | ||
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 | ||
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 | ||
380 | static int led_prepare(struct tca6507_led *led) | |
381 | { | |
1f431afd N |
382 | /* Assign this led to a bank, configuring that bank if |
383 | * necessary. */ | |
a6d511e5 N |
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 | /* | |
1f431afd N |
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. | |
a6d511e5 N |
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 | /* | |
1f431afd N |
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. | |
a6d511e5 N |
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 | ||
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 | /* | |
1f431afd N |
533 | * Can only fail on timer setup. In that case we need |
534 | * to re-establish as steady level. | |
a6d511e5 N |
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 | ||
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 | ||
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 | |
596 | static void tca6507_gpio_set_value(struct gpio_chip *gc, | |
597 | unsigned offset, int val) | |
598 | { | |
2a664343 | 599 | struct tca6507_chip *tca = gpiochip_get_data(gc); |
a6d511e5 N |
600 | unsigned long flags; |
601 | ||
602 | spin_lock_irqsave(&tca->lock, flags); | |
603 | /* | |
1f431afd N |
604 | * 'OFF' is floating high, and 'ON' is pulled down, so it has |
605 | * the inverse sense of 'val'. | |
a6d511e5 N |
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 | ||
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 | ||
c1ff1a1d | 621 | static int tca6507_probe_gpios(struct device *dev, |
a6d511e5 N |
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 */ | |
a6d511e5 N |
632 | tca->gpio_map[gpios] = i; |
633 | gpios++; | |
634 | } | |
635 | ||
636 | if (!gpios) | |
637 | return 0; | |
638 | ||
639 | tca->gpio.label = "gpio-tca6507"; | |
a6d511e5 N |
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; | |
c1ff1a1d | 645 | tca->gpio.parent = dev; |
10ead6e5 | 646 | #ifdef CONFIG_OF_GPIO |
c1ff1a1d | 647 | tca->gpio.of_node = of_node_get(dev_of_node(dev)); |
10ead6e5 | 648 | #endif |
2a664343 | 649 | err = gpiochip_add_data(&tca->gpio, tca); |
a6d511e5 N |
650 | if (err) { |
651 | tca->gpio.ngpio = 0; | |
652 | return err; | |
653 | } | |
a6d511e5 N |
654 | return 0; |
655 | } | |
656 | ||
657 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
658 | { | |
88d5e520 | 659 | if (tca->gpio.ngpio) |
660 | gpiochip_remove(&tca->gpio); | |
a6d511e5 N |
661 | } |
662 | #else /* CONFIG_GPIOLIB */ | |
c1ff1a1d | 663 | static int tca6507_probe_gpios(struct device *dev, |
a6d511e5 N |
664 | struct tca6507_chip *tca, |
665 | struct tca6507_platform_data *pdata) | |
666 | { | |
667 | return 0; | |
668 | } | |
669 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
670 | { | |
671 | } | |
672 | #endif /* CONFIG_GPIOLIB */ | |
673 | ||
0c596a7e | 674 | static struct tca6507_platform_data * |
c1ff1a1d | 675 | tca6507_led_dt_init(struct device *dev) |
0c596a7e | 676 | { |
0c596a7e | 677 | struct tca6507_platform_data *pdata; |
96f52410 | 678 | struct fwnode_handle *child; |
0c596a7e | 679 | struct led_info *tca_leds; |
ef754e88 | 680 | int count; |
0c596a7e | 681 | |
c1ff1a1d | 682 | count = device_get_child_node_count(dev); |
ef754e88 | 683 | if (!count || count > NUM_LEDS) |
0c596a7e MB |
684 | return ERR_PTR(-ENODEV); |
685 | ||
c1ff1a1d | 686 | tca_leds = devm_kcalloc(dev, NUM_LEDS, sizeof(struct led_info), |
96f52410 | 687 | GFP_KERNEL); |
0c596a7e MB |
688 | if (!tca_leds) |
689 | return ERR_PTR(-ENOMEM); | |
690 | ||
c1ff1a1d | 691 | device_for_each_child_node(dev, child) { |
0c596a7e MB |
692 | struct led_info led; |
693 | u32 reg; | |
694 | int ret; | |
695 | ||
96f52410 MB |
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 | ||
9334129e | 702 | led.flags = 0; |
96f52410 MB |
703 | if (fwnode_property_match_string(child, "compatible", |
704 | "gpio") >= 0) | |
10ead6e5 | 705 | led.flags |= TCA6507_MAKE_GPIO; |
96f52410 MB |
706 | |
707 | ret = fwnode_property_read_u32(child, "reg", ®); | |
708 | if (ret || reg >= NUM_LEDS) { | |
709 | fwnode_handle_put(child); | |
a2380982 | 710 | return ERR_PTR(ret ? : -EINVAL); |
96f52410 | 711 | } |
0c596a7e MB |
712 | |
713 | tca_leds[reg] = led; | |
714 | } | |
96f52410 | 715 | |
c1ff1a1d | 716 | pdata = devm_kzalloc(dev, sizeof(struct tca6507_platform_data), |
96f52410 | 717 | GFP_KERNEL); |
0c596a7e MB |
718 | if (!pdata) |
719 | return ERR_PTR(-ENOMEM); | |
720 | ||
721 | pdata->leds.leds = tca_leds; | |
9334129e | 722 | pdata->leds.num_leds = NUM_LEDS; |
33ca1532 | 723 | #ifdef CONFIG_GPIOLIB |
10ead6e5 | 724 | pdata->gpio_base = -1; |
33ca1532 | 725 | #endif |
96f52410 | 726 | |
0c596a7e MB |
727 | return pdata; |
728 | } | |
729 | ||
e8b7dabc | 730 | static const struct of_device_id __maybe_unused of_tca6507_leds_match[] = { |
0c596a7e MB |
731 | { .compatible = "ti,tca6507", }, |
732 | {}, | |
733 | }; | |
4d59ed85 | 734 | MODULE_DEVICE_TABLE(of, of_tca6507_leds_match); |
0c596a7e | 735 | |
98ea1ea2 | 736 | static int tca6507_probe(struct i2c_client *client, |
0c596a7e | 737 | const struct i2c_device_id *id) |
a6d511e5 | 738 | { |
c1ff1a1d | 739 | struct device *dev = &client->dev; |
a6d511e5 | 740 | struct i2c_adapter *adapter; |
c1ff1a1d | 741 | struct tca6507_chip *tca; |
a6d511e5 N |
742 | struct tca6507_platform_data *pdata; |
743 | int err; | |
744 | int i = 0; | |
745 | ||
09bfa5f6 | 746 | adapter = client->adapter; |
a6d511e5 N |
747 | |
748 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) | |
749 | return -EIO; | |
750 | ||
c1ff1a1d | 751 | pdata = tca6507_led_dt_init(dev); |
96f52410 | 752 | if (IS_ERR(pdata)) { |
c1ff1a1d | 753 | dev_err(dev, "Need %d entries in platform-data list\n", NUM_LEDS); |
96f52410 | 754 | return PTR_ERR(pdata); |
a6d511e5 | 755 | } |
c1ff1a1d | 756 | tca = devm_kzalloc(dev, sizeof(*tca), GFP_KERNEL); |
a6d511e5 | 757 | if (!tca) |
920c4f4c | 758 | return -ENOMEM; |
a6d511e5 N |
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; | |
c1ff1a1d | 777 | err = led_classdev_register(dev, &l->led_cdev); |
a6d511e5 N |
778 | if (err < 0) |
779 | goto exit; | |
780 | } | |
781 | } | |
c1ff1a1d | 782 | err = tca6507_probe_gpios(dev, tca, pdata); |
a6d511e5 N |
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: | |
920c4f4c | 791 | while (i--) { |
a6d511e5 N |
792 | if (tca->leds[i].led_cdev.name) |
793 | led_classdev_unregister(&tca->leds[i].led_cdev); | |
920c4f4c | 794 | } |
a6d511e5 N |
795 | return err; |
796 | } | |
797 | ||
678e8a6b | 798 | static int tca6507_remove(struct i2c_client *client) |
a6d511e5 N |
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); | |
a6d511e5 N |
810 | |
811 | return 0; | |
812 | } | |
813 | ||
814 | static struct i2c_driver tca6507_driver = { | |
815 | .driver = { | |
816 | .name = "leds-tca6507", | |
fbd9df28 | 817 | .of_match_table = of_match_ptr(of_tca6507_leds_match), |
a6d511e5 N |
818 | }, |
819 | .probe = tca6507_probe, | |
df07cf81 | 820 | .remove = tca6507_remove, |
a6d511e5 N |
821 | .id_table = tca6507_id, |
822 | }; | |
823 | ||
2e911767 | 824 | module_i2c_driver(tca6507_driver); |
a6d511e5 N |
825 | |
826 | MODULE_AUTHOR("NeilBrown <neilb@suse.de>"); | |
827 | MODULE_DESCRIPTION("TCA6507 LED/GPO driver"); | |
828 | MODULE_LICENSE("GPL v2"); |