Commit | Line | Data |
---|---|---|
a6d511e5 N |
1 | /* |
2 | * leds-tca6507 | |
3 | * | |
4 | * The TCA6507 is a programmable LED controller that can drive 7 | |
5 | * separate lines either by holding them low, or by pulsing them | |
6 | * with modulated width. | |
7 | * The modulation can be varied in a simple pattern to produce a blink or | |
8 | * double-blink. | |
9 | * | |
10 | * This driver can configure each line either as a 'GPIO' which is out-only | |
11 | * (no pull-up) or as an LED with variable brightness and hardware-assisted | |
12 | * blinking. | |
13 | * | |
14 | * Apart from OFF and ON there are three programmable brightness levels which | |
15 | * can be programmed from 0 to 15 and indicate how many 500usec intervals in | |
16 | * each 8msec that the led is 'on'. The levels are named MASTER, BANK0 and | |
17 | * BANK1. | |
18 | * | |
19 | * There are two different blink rates that can be programmed, each with | |
20 | * separate time for rise, on, fall, off and second-off. Thus if 3 or more | |
21 | * different non-trivial rates are required, software must be used for the extra | |
22 | * rates. The two different blink rates must align with the two levels BANK0 and | |
23 | * BANK1. | |
24 | * This driver does not support double-blink so 'second-off' always matches | |
25 | * 'off'. | |
26 | * | |
27 | * Only 16 different times can be programmed in a roughly logarithmic scale from | |
28 | * 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 | |
33 | * handled in software. This driver allows 12.5% error in matching. | |
34 | * | |
35 | * This driver does not allow rise/fall rates to be set explicitly. When trying | |
36 | * to match a given 'on' or 'off' period, an appropriate pair of 'change' and | |
37 | * 'hold' times are chosen to get a close match. If the target delay is even, | |
38 | * the 'change' number will be the smaller; if odd, the 'hold' number will be | |
39 | * the smaller. | |
40 | ||
41 | * Choosing pairs of delays with 12.5% errors allows us to match delays in the | |
42 | * ranges: 56-72, 112-144, 168-216, 224-27504, 28560-36720. | |
43 | * 26% of the achievable sums can be matched by multiple pairings. For example | |
44 | * 1536 == 1536+0, 1024+512, or 768+768. This driver will always choose the | |
45 | * pairing with the least maximum - 768+768 in this case. Other pairings are | |
46 | * not available. | |
47 | * | |
48 | * Access to the 3 levels and 2 blinks are on a first-come, first-served basis. | |
49 | * Access can be shared by multiple leds if they have the same level and | |
50 | * either same blink rates, or some don't blink. | |
51 | * When a led changes, it relinquishes access and tries again, so it might | |
52 | * lose access to hardware blink. | |
53 | * If a blink engine cannot be allocated, software blink is used. | |
54 | * If the desired brightness cannot be allocated, the closest available non-zero | |
55 | * brightness is used. As 'full' is always available, the worst case would be | |
56 | * to have two different blink rates at '1', with Max at '2', then other leds | |
57 | * will have to choose between '2' and '16'. Hopefully this is not likely. | |
58 | * | |
59 | * Each bank (BANK0 and BANK1) has two usage counts - LEDs using the brightness | |
60 | * and LEDs using the blink. It can only be reprogrammed when the appropriate | |
61 | * counter is zero. The MASTER level has a single usage count. | |
62 | * | |
63 | * Each Led has programmable 'on' and 'off' time as milliseconds. With each | |
64 | * there is a flag saying if it was explicitly requested or defaulted. | |
65 | * Similarly the banks know if each time was explicit or a default. Defaults | |
66 | * are permitted to be changed freely - they are not recognised when matching. | |
67 | * | |
68 | * | |
69 | * An led-tca6507 device must be provided with platform data. This data | |
70 | * lists for each output: the name, default trigger, and whether the signal | |
71 | * is being used as a GPiO rather than an led. 'struct led_plaform_data' | |
72 | * is used for this. If 'name' is NULL, the output isn't used. If 'flags' | |
73 | * is TCA6507_MAKE_CPIO, the output is a GPO. | |
74 | * The "struct led_platform_data" can be embedded in a | |
75 | * "struct tca6507_platform_data" which adds a 'gpio_base' for the GPiOs, | |
76 | * and a 'setup' callback which is called once the GPiOs are available. | |
77 | * | |
78 | */ | |
79 | ||
80 | #include <linux/module.h> | |
81 | #include <linux/slab.h> | |
82 | #include <linux/leds.h> | |
83 | #include <linux/err.h> | |
84 | #include <linux/i2c.h> | |
85 | #include <linux/gpio.h> | |
86 | #include <linux/workqueue.h> | |
87 | #include <linux/leds-tca6507.h> | |
fbd9df28 | 88 | #include <linux/of.h> |
a6d511e5 N |
89 | |
90 | /* LED select registers determine the source that drives LED outputs */ | |
91 | #define TCA6507_LS_LED_OFF 0x0 /* Output HI-Z (off) */ | |
92 | #define TCA6507_LS_LED_OFF1 0x1 /* Output HI-Z (off) - not used */ | |
93 | #define TCA6507_LS_LED_PWM0 0x2 /* Output LOW with Bank0 rate */ | |
94 | #define TCA6507_LS_LED_PWM1 0x3 /* Output LOW with Bank1 rate */ | |
95 | #define TCA6507_LS_LED_ON 0x4 /* Output LOW (on) */ | |
96 | #define TCA6507_LS_LED_MIR 0x5 /* Output LOW with Master Intensity */ | |
97 | #define TCA6507_LS_BLINK0 0x6 /* Blink at Bank0 rate */ | |
98 | #define TCA6507_LS_BLINK1 0x7 /* Blink at Bank1 rate */ | |
99 | ||
100 | enum { | |
101 | BANK0, | |
102 | BANK1, | |
103 | MASTER, | |
104 | }; | |
105 | static int bank_source[3] = { | |
106 | TCA6507_LS_LED_PWM0, | |
107 | TCA6507_LS_LED_PWM1, | |
108 | TCA6507_LS_LED_MIR, | |
109 | }; | |
110 | static int blink_source[2] = { | |
111 | TCA6507_LS_BLINK0, | |
112 | TCA6507_LS_BLINK1, | |
113 | }; | |
114 | ||
115 | /* PWM registers */ | |
116 | #define TCA6507_REG_CNT 11 | |
117 | ||
118 | /* | |
119 | * 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output | |
120 | * owns one bit in each register | |
121 | */ | |
122 | #define TCA6507_FADE_ON 0x03 | |
123 | #define TCA6507_FULL_ON 0x04 | |
124 | #define TCA6507_FADE_OFF 0x05 | |
125 | #define TCA6507_FIRST_OFF 0x06 | |
126 | #define TCA6507_SECOND_OFF 0x07 | |
127 | #define TCA6507_MAX_INTENSITY 0x08 | |
128 | #define TCA6507_MASTER_INTENSITY 0x09 | |
129 | #define TCA6507_INITIALIZE 0x0A | |
130 | ||
131 | #define INIT_CODE 0x8 | |
132 | ||
133 | #define TIMECODES 16 | |
134 | static int time_codes[TIMECODES] = { | |
135 | 0, 64, 128, 192, 256, 384, 512, 768, | |
136 | 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320 | |
137 | }; | |
138 | ||
139 | /* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */ | |
140 | static inline int TO_LEVEL(int brightness) | |
141 | { | |
142 | return brightness >> 4; | |
143 | } | |
144 | ||
145 | /* ...and convert back */ | |
146 | static inline int TO_BRIGHT(int level) | |
147 | { | |
148 | if (level) | |
149 | return (level << 4) | 0xf; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | #define NUM_LEDS 7 | |
154 | struct tca6507_chip { | |
155 | int reg_set; /* One bit per register where | |
156 | * a '1' means the register | |
157 | * should be written */ | |
158 | u8 reg_file[TCA6507_REG_CNT]; | |
159 | /* Bank 2 is Master Intensity and doesn't use times */ | |
160 | struct bank { | |
161 | int level; | |
162 | int ontime, offtime; | |
163 | int on_dflt, off_dflt; | |
164 | int time_use, level_use; | |
165 | } bank[3]; | |
166 | struct i2c_client *client; | |
167 | struct work_struct work; | |
168 | spinlock_t lock; | |
169 | ||
170 | struct tca6507_led { | |
171 | struct tca6507_chip *chip; | |
172 | struct led_classdev led_cdev; | |
173 | int num; | |
174 | int ontime, offtime; | |
175 | int on_dflt, off_dflt; | |
176 | int bank; /* Bank used, or -1 */ | |
177 | int blink; /* Set if hardware-blinking */ | |
178 | } leds[NUM_LEDS]; | |
179 | #ifdef CONFIG_GPIOLIB | |
180 | struct gpio_chip gpio; | |
181 | const char *gpio_name[NUM_LEDS]; | |
182 | int gpio_map[NUM_LEDS]; | |
183 | #endif | |
184 | }; | |
185 | ||
186 | static const struct i2c_device_id tca6507_id[] = { | |
187 | { "tca6507" }, | |
188 | { } | |
189 | }; | |
190 | MODULE_DEVICE_TABLE(i2c, tca6507_id); | |
191 | ||
192 | static int choose_times(int msec, int *c1p, int *c2p) | |
193 | { | |
194 | /* | |
195 | * Choose two timecodes which add to 'msec' as near as possible. | |
196 | * The first returned is the 'on' or 'off' time. The second is to be | |
197 | * used as a 'fade-on' or 'fade-off' time. If 'msec' is even, | |
198 | * the first will not be smaller than the second. If 'msec' is odd, | |
199 | * the first will not be larger than the second. | |
200 | * If we cannot get a sum within 1/8 of 'msec' fail with -EINVAL, | |
201 | * otherwise return the sum that was achieved, plus 1 if the first is | |
202 | * smaller. | |
203 | * If two possibilities are equally good (e.g. 512+0, 256+256), choose | |
204 | * the first pair so there is more change-time visible (i.e. it is | |
205 | * softer). | |
206 | */ | |
207 | int c1, c2; | |
208 | int tmax = msec * 9 / 8; | |
209 | int tmin = msec * 7 / 8; | |
210 | int diff = 65536; | |
211 | ||
212 | /* We start at '1' to ensure we never even think of choosing a | |
213 | * total time of '0'. | |
214 | */ | |
215 | for (c1 = 1; c1 < TIMECODES; c1++) { | |
216 | int t = time_codes[c1]; | |
217 | if (t*2 < tmin) | |
218 | continue; | |
219 | if (t > tmax) | |
220 | break; | |
221 | for (c2 = 0; c2 <= c1; c2++) { | |
222 | int tt = t + time_codes[c2]; | |
223 | int d; | |
224 | if (tt < tmin) | |
225 | continue; | |
226 | if (tt > tmax) | |
227 | break; | |
228 | /* This works! */ | |
229 | d = abs(msec - tt); | |
230 | if (d >= diff) | |
231 | continue; | |
232 | /* Best yet */ | |
233 | *c1p = c1; | |
234 | *c2p = c2; | |
235 | diff = d; | |
236 | if (d == 0) | |
237 | return msec; | |
238 | } | |
239 | } | |
240 | if (diff < 65536) { | |
241 | int actual; | |
242 | if (msec & 1) { | |
243 | c1 = *c2p; | |
244 | *c2p = *c1p; | |
245 | *c1p = c1; | |
246 | } | |
247 | actual = time_codes[*c1p] + time_codes[*c2p]; | |
248 | if (*c1p < *c2p) | |
249 | return actual + 1; | |
250 | else | |
251 | return actual; | |
252 | } | |
253 | /* No close match */ | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
257 | /* | |
258 | * Update the register file with the appropriate 3-bit state for | |
259 | * the given led. | |
260 | */ | |
261 | static void set_select(struct tca6507_chip *tca, int led, int val) | |
262 | { | |
263 | int mask = (1 << led); | |
264 | int bit; | |
265 | ||
266 | for (bit = 0; bit < 3; bit++) { | |
267 | int n = tca->reg_file[bit] & ~mask; | |
268 | if (val & (1 << bit)) | |
269 | n |= mask; | |
270 | if (tca->reg_file[bit] != n) { | |
271 | tca->reg_file[bit] = n; | |
272 | tca->reg_set |= (1 << bit); | |
273 | } | |
274 | } | |
275 | } | |
276 | ||
277 | /* Update the register file with the appropriate 4-bit code for | |
278 | * one bank or other. This can be used for timers, for levels, or | |
279 | * for initialisation. | |
280 | */ | |
281 | static void set_code(struct tca6507_chip *tca, int reg, int bank, int new) | |
282 | { | |
283 | int mask = 0xF; | |
284 | int n; | |
285 | if (bank) { | |
286 | mask <<= 4; | |
287 | new <<= 4; | |
288 | } | |
289 | n = tca->reg_file[reg] & ~mask; | |
290 | n |= new; | |
291 | if (tca->reg_file[reg] != n) { | |
292 | tca->reg_file[reg] = n; | |
293 | tca->reg_set |= 1 << reg; | |
294 | } | |
295 | } | |
296 | ||
297 | /* Update brightness level. */ | |
298 | static void set_level(struct tca6507_chip *tca, int bank, int level) | |
299 | { | |
300 | switch (bank) { | |
301 | case BANK0: | |
302 | case BANK1: | |
303 | set_code(tca, TCA6507_MAX_INTENSITY, bank, level); | |
304 | break; | |
305 | case MASTER: | |
306 | set_code(tca, TCA6507_MASTER_INTENSITY, 0, level); | |
307 | break; | |
308 | } | |
309 | tca->bank[bank].level = level; | |
310 | } | |
311 | ||
312 | /* Record all relevant time code for a given bank */ | |
313 | static void set_times(struct tca6507_chip *tca, int bank) | |
314 | { | |
315 | int c1, c2; | |
316 | int result; | |
317 | ||
318 | result = choose_times(tca->bank[bank].ontime, &c1, &c2); | |
319 | dev_dbg(&tca->client->dev, | |
320 | "Chose on times %d(%d) %d(%d) for %dms\n", c1, time_codes[c1], | |
321 | c2, time_codes[c2], tca->bank[bank].ontime); | |
322 | set_code(tca, TCA6507_FADE_ON, bank, c2); | |
323 | set_code(tca, TCA6507_FULL_ON, bank, c1); | |
324 | tca->bank[bank].ontime = result; | |
325 | ||
326 | result = choose_times(tca->bank[bank].offtime, &c1, &c2); | |
327 | dev_dbg(&tca->client->dev, | |
328 | "Chose off times %d(%d) %d(%d) for %dms\n", c1, time_codes[c1], | |
329 | c2, time_codes[c2], tca->bank[bank].offtime); | |
330 | set_code(tca, TCA6507_FADE_OFF, bank, c2); | |
331 | set_code(tca, TCA6507_FIRST_OFF, bank, c1); | |
332 | set_code(tca, TCA6507_SECOND_OFF, bank, c1); | |
333 | tca->bank[bank].offtime = result; | |
334 | ||
335 | set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE); | |
336 | } | |
337 | ||
338 | /* Write all needed register of tca6507 */ | |
339 | ||
340 | static void tca6507_work(struct work_struct *work) | |
341 | { | |
342 | struct tca6507_chip *tca = container_of(work, struct tca6507_chip, | |
343 | work); | |
344 | struct i2c_client *cl = tca->client; | |
345 | int set; | |
346 | u8 file[TCA6507_REG_CNT]; | |
347 | int r; | |
348 | ||
349 | spin_lock_irq(&tca->lock); | |
350 | set = tca->reg_set; | |
351 | memcpy(file, tca->reg_file, TCA6507_REG_CNT); | |
352 | tca->reg_set = 0; | |
353 | spin_unlock_irq(&tca->lock); | |
354 | ||
355 | for (r = 0; r < TCA6507_REG_CNT; r++) | |
356 | if (set & (1<<r)) | |
357 | i2c_smbus_write_byte_data(cl, r, file[r]); | |
358 | } | |
359 | ||
360 | static void led_release(struct tca6507_led *led) | |
361 | { | |
362 | /* If led owns any resource, release it. */ | |
363 | struct tca6507_chip *tca = led->chip; | |
364 | if (led->bank >= 0) { | |
365 | struct bank *b = tca->bank + led->bank; | |
366 | if (led->blink) | |
367 | b->time_use--; | |
368 | b->level_use--; | |
369 | } | |
370 | led->blink = 0; | |
371 | led->bank = -1; | |
372 | } | |
373 | ||
374 | static int led_prepare(struct tca6507_led *led) | |
375 | { | |
376 | /* Assign this led to a bank, configuring that bank if necessary. */ | |
377 | int level = TO_LEVEL(led->led_cdev.brightness); | |
378 | struct tca6507_chip *tca = led->chip; | |
379 | int c1, c2; | |
380 | int i; | |
381 | struct bank *b; | |
382 | int need_init = 0; | |
383 | ||
384 | led->led_cdev.brightness = TO_BRIGHT(level); | |
385 | if (level == 0) { | |
386 | set_select(tca, led->num, TCA6507_LS_LED_OFF); | |
387 | return 0; | |
388 | } | |
389 | ||
390 | if (led->ontime == 0 || led->offtime == 0) { | |
391 | /* | |
392 | * Just set the brightness, choosing first usable bank. | |
393 | * If none perfect, choose best. | |
394 | * Count backwards so we check MASTER bank first | |
395 | * to avoid wasting a timer. | |
396 | */ | |
397 | int best = -1;/* full-on */ | |
398 | int diff = 15-level; | |
399 | ||
400 | if (level == 15) { | |
401 | set_select(tca, led->num, TCA6507_LS_LED_ON); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | for (i = MASTER; i >= BANK0; i--) { | |
406 | int d; | |
407 | if (tca->bank[i].level == level || | |
408 | tca->bank[i].level_use == 0) { | |
409 | best = i; | |
410 | break; | |
411 | } | |
412 | d = abs(level - tca->bank[i].level); | |
413 | if (d < diff) { | |
414 | diff = d; | |
415 | best = i; | |
416 | } | |
417 | } | |
418 | if (best == -1) { | |
419 | /* Best brightness is full-on */ | |
420 | set_select(tca, led->num, TCA6507_LS_LED_ON); | |
421 | led->led_cdev.brightness = LED_FULL; | |
422 | return 0; | |
423 | } | |
424 | ||
425 | if (!tca->bank[best].level_use) | |
426 | set_level(tca, best, level); | |
427 | ||
428 | tca->bank[best].level_use++; | |
429 | led->bank = best; | |
430 | set_select(tca, led->num, bank_source[best]); | |
431 | led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | /* | |
436 | * We have on/off time so we need to try to allocate a timing bank. | |
437 | * First check if times are compatible with hardware and give up if | |
438 | * not. | |
439 | */ | |
440 | if (choose_times(led->ontime, &c1, &c2) < 0) | |
441 | return -EINVAL; | |
442 | if (choose_times(led->offtime, &c1, &c2) < 0) | |
443 | return -EINVAL; | |
444 | ||
445 | for (i = BANK0; i <= BANK1; i++) { | |
446 | if (tca->bank[i].level_use == 0) | |
447 | /* not in use - it is ours! */ | |
448 | break; | |
449 | if (tca->bank[i].level != level) | |
450 | /* Incompatible level - skip */ | |
451 | /* FIX: if timer matches we maybe should consider | |
452 | * this anyway... | |
453 | */ | |
454 | continue; | |
455 | ||
456 | if (tca->bank[i].time_use == 0) | |
457 | /* Timer not in use, and level matches - use it */ | |
458 | break; | |
459 | ||
460 | if (!(tca->bank[i].on_dflt || | |
461 | led->on_dflt || | |
462 | tca->bank[i].ontime == led->ontime)) | |
463 | /* on time is incompatible */ | |
464 | continue; | |
465 | ||
466 | if (!(tca->bank[i].off_dflt || | |
467 | led->off_dflt || | |
468 | tca->bank[i].offtime == led->offtime)) | |
469 | /* off time is incompatible */ | |
470 | continue; | |
471 | ||
472 | /* looks like a suitable match */ | |
473 | break; | |
474 | } | |
475 | ||
476 | if (i > BANK1) | |
477 | /* Nothing matches - how sad */ | |
478 | return -EINVAL; | |
479 | ||
480 | b = &tca->bank[i]; | |
481 | if (b->level_use == 0) | |
482 | set_level(tca, i, level); | |
483 | b->level_use++; | |
484 | led->bank = i; | |
485 | ||
486 | if (b->on_dflt || | |
487 | !led->on_dflt || | |
488 | b->time_use == 0) { | |
489 | b->ontime = led->ontime; | |
490 | b->on_dflt = led->on_dflt; | |
491 | need_init = 1; | |
492 | } | |
493 | ||
494 | if (b->off_dflt || | |
495 | !led->off_dflt || | |
496 | b->time_use == 0) { | |
497 | b->offtime = led->offtime; | |
498 | b->off_dflt = led->off_dflt; | |
499 | need_init = 1; | |
500 | } | |
501 | ||
502 | if (need_init) | |
503 | set_times(tca, i); | |
504 | ||
505 | led->ontime = b->ontime; | |
506 | led->offtime = b->offtime; | |
507 | ||
508 | b->time_use++; | |
509 | led->blink = 1; | |
510 | led->led_cdev.brightness = TO_BRIGHT(b->level); | |
511 | set_select(tca, led->num, blink_source[i]); | |
512 | return 0; | |
513 | } | |
514 | ||
515 | static int led_assign(struct tca6507_led *led) | |
516 | { | |
517 | struct tca6507_chip *tca = led->chip; | |
518 | int err; | |
519 | unsigned long flags; | |
520 | ||
521 | spin_lock_irqsave(&tca->lock, flags); | |
522 | led_release(led); | |
523 | err = led_prepare(led); | |
524 | if (err) { | |
525 | /* | |
526 | * Can only fail on timer setup. In that case we need to | |
527 | * re-establish as steady level. | |
528 | */ | |
529 | led->ontime = 0; | |
530 | led->offtime = 0; | |
531 | led_prepare(led); | |
532 | } | |
533 | spin_unlock_irqrestore(&tca->lock, flags); | |
534 | ||
535 | if (tca->reg_set) | |
536 | schedule_work(&tca->work); | |
537 | return err; | |
538 | } | |
539 | ||
540 | static void tca6507_brightness_set(struct led_classdev *led_cdev, | |
541 | enum led_brightness brightness) | |
542 | { | |
543 | struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, | |
544 | led_cdev); | |
545 | led->led_cdev.brightness = brightness; | |
546 | led->ontime = 0; | |
547 | led->offtime = 0; | |
548 | led_assign(led); | |
549 | } | |
550 | ||
551 | static int tca6507_blink_set(struct led_classdev *led_cdev, | |
552 | unsigned long *delay_on, | |
553 | unsigned long *delay_off) | |
554 | { | |
555 | struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, | |
556 | led_cdev); | |
557 | ||
558 | if (*delay_on == 0) | |
559 | led->on_dflt = 1; | |
560 | else if (delay_on != &led_cdev->blink_delay_on) | |
561 | led->on_dflt = 0; | |
562 | led->ontime = *delay_on; | |
563 | ||
564 | if (*delay_off == 0) | |
565 | led->off_dflt = 1; | |
566 | else if (delay_off != &led_cdev->blink_delay_off) | |
567 | led->off_dflt = 0; | |
568 | led->offtime = *delay_off; | |
569 | ||
570 | if (led->ontime == 0) | |
571 | led->ontime = 512; | |
572 | if (led->offtime == 0) | |
573 | led->offtime = 512; | |
574 | ||
575 | if (led->led_cdev.brightness == LED_OFF) | |
576 | led->led_cdev.brightness = LED_FULL; | |
577 | if (led_assign(led) < 0) { | |
578 | led->ontime = 0; | |
579 | led->offtime = 0; | |
580 | led->led_cdev.brightness = LED_OFF; | |
581 | return -EINVAL; | |
582 | } | |
583 | *delay_on = led->ontime; | |
584 | *delay_off = led->offtime; | |
585 | return 0; | |
586 | } | |
587 | ||
588 | #ifdef CONFIG_GPIOLIB | |
589 | static void tca6507_gpio_set_value(struct gpio_chip *gc, | |
590 | unsigned offset, int val) | |
591 | { | |
592 | struct tca6507_chip *tca = container_of(gc, struct tca6507_chip, gpio); | |
593 | unsigned long flags; | |
594 | ||
595 | spin_lock_irqsave(&tca->lock, flags); | |
596 | /* | |
597 | * 'OFF' is floating high, and 'ON' is pulled down, so it has the | |
598 | * inverse sense of 'val'. | |
599 | */ | |
600 | set_select(tca, tca->gpio_map[offset], | |
601 | val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON); | |
602 | spin_unlock_irqrestore(&tca->lock, flags); | |
603 | if (tca->reg_set) | |
604 | schedule_work(&tca->work); | |
605 | } | |
606 | ||
607 | static int tca6507_gpio_direction_output(struct gpio_chip *gc, | |
608 | unsigned offset, int val) | |
609 | { | |
610 | tca6507_gpio_set_value(gc, offset, val); | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static int tca6507_probe_gpios(struct i2c_client *client, | |
615 | struct tca6507_chip *tca, | |
616 | struct tca6507_platform_data *pdata) | |
617 | { | |
618 | int err; | |
619 | int i = 0; | |
620 | int gpios = 0; | |
621 | ||
622 | for (i = 0; i < NUM_LEDS; i++) | |
623 | if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) { | |
624 | /* Configure as a gpio */ | |
625 | tca->gpio_name[gpios] = pdata->leds.leds[i].name; | |
626 | tca->gpio_map[gpios] = i; | |
627 | gpios++; | |
628 | } | |
629 | ||
630 | if (!gpios) | |
631 | return 0; | |
632 | ||
633 | tca->gpio.label = "gpio-tca6507"; | |
634 | tca->gpio.names = tca->gpio_name; | |
635 | tca->gpio.ngpio = gpios; | |
636 | tca->gpio.base = pdata->gpio_base; | |
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.dev = &client->dev; | |
641 | err = gpiochip_add(&tca->gpio); | |
642 | if (err) { | |
643 | tca->gpio.ngpio = 0; | |
644 | return err; | |
645 | } | |
646 | if (pdata->setup) | |
647 | pdata->setup(tca->gpio.base, tca->gpio.ngpio); | |
648 | return 0; | |
649 | } | |
650 | ||
651 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
652 | { | |
653 | if (tca->gpio.ngpio) { | |
654 | int err = gpiochip_remove(&tca->gpio); | |
655 | dev_err(&tca->client->dev, "%s failed, %d\n", | |
656 | "gpiochip_remove()", err); | |
657 | } | |
658 | } | |
659 | #else /* CONFIG_GPIOLIB */ | |
660 | static int tca6507_probe_gpios(struct i2c_client *client, | |
661 | struct tca6507_chip *tca, | |
662 | struct tca6507_platform_data *pdata) | |
663 | { | |
664 | return 0; | |
665 | } | |
666 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
667 | { | |
668 | } | |
669 | #endif /* CONFIG_GPIOLIB */ | |
670 | ||
0c596a7e MB |
671 | #ifdef CONFIG_OF |
672 | static struct tca6507_platform_data * | |
673 | tca6507_led_dt_init(struct i2c_client *client) | |
674 | { | |
675 | struct device_node *np = client->dev.of_node, *child; | |
676 | struct tca6507_platform_data *pdata; | |
677 | struct led_info *tca_leds; | |
ef754e88 | 678 | int count; |
0c596a7e | 679 | |
ef754e88 AL |
680 | count = of_get_child_count(np); |
681 | if (!count || count > NUM_LEDS) | |
0c596a7e MB |
682 | return ERR_PTR(-ENODEV); |
683 | ||
684 | tca_leds = devm_kzalloc(&client->dev, | |
685 | sizeof(struct led_info) * count, GFP_KERNEL); | |
686 | if (!tca_leds) | |
687 | return ERR_PTR(-ENOMEM); | |
688 | ||
689 | for_each_child_of_node(np, child) { | |
690 | struct led_info led; | |
691 | u32 reg; | |
692 | int ret; | |
693 | ||
694 | led.name = | |
695 | of_get_property(child, "label", NULL) ? : child->name; | |
696 | led.default_trigger = | |
697 | of_get_property(child, "linux,default-trigger", NULL); | |
698 | ||
699 | ret = of_property_read_u32(child, "reg", ®); | |
700 | if (ret != 0) | |
701 | continue; | |
702 | ||
703 | tca_leds[reg] = led; | |
704 | } | |
705 | pdata = devm_kzalloc(&client->dev, | |
706 | sizeof(struct tca6507_platform_data), GFP_KERNEL); | |
707 | if (!pdata) | |
708 | return ERR_PTR(-ENOMEM); | |
709 | ||
710 | pdata->leds.leds = tca_leds; | |
711 | pdata->leds.num_leds = count; | |
712 | ||
713 | return pdata; | |
714 | } | |
715 | ||
716 | static const struct of_device_id of_tca6507_leds_match[] = { | |
717 | { .compatible = "ti,tca6507", }, | |
718 | {}, | |
719 | }; | |
720 | ||
721 | #else | |
722 | static struct tca6507_platform_data * | |
723 | tca6507_led_dt_init(struct i2c_client *client) | |
724 | { | |
725 | return ERR_PTR(-ENODEV); | |
726 | } | |
727 | ||
0c596a7e MB |
728 | #endif |
729 | ||
98ea1ea2 | 730 | static int tca6507_probe(struct i2c_client *client, |
0c596a7e | 731 | const struct i2c_device_id *id) |
a6d511e5 N |
732 | { |
733 | struct tca6507_chip *tca; | |
734 | struct i2c_adapter *adapter; | |
735 | struct tca6507_platform_data *pdata; | |
736 | int err; | |
737 | int i = 0; | |
738 | ||
739 | adapter = to_i2c_adapter(client->dev.parent); | |
87aae1ea | 740 | pdata = dev_get_platdata(&client->dev); |
a6d511e5 N |
741 | |
742 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) | |
743 | return -EIO; | |
744 | ||
745 | if (!pdata || pdata->leds.num_leds != NUM_LEDS) { | |
0c596a7e MB |
746 | pdata = tca6507_led_dt_init(client); |
747 | if (IS_ERR(pdata)) { | |
748 | dev_err(&client->dev, "Need %d entries in platform-data list\n", | |
749 | NUM_LEDS); | |
750 | return PTR_ERR(pdata); | |
751 | } | |
a6d511e5 | 752 | } |
6770fc60 | 753 | tca = devm_kzalloc(&client->dev, sizeof(*tca), GFP_KERNEL); |
a6d511e5 | 754 | if (!tca) |
920c4f4c | 755 | return -ENOMEM; |
a6d511e5 N |
756 | |
757 | tca->client = client; | |
758 | INIT_WORK(&tca->work, tca6507_work); | |
759 | spin_lock_init(&tca->lock); | |
760 | i2c_set_clientdata(client, tca); | |
761 | ||
762 | for (i = 0; i < NUM_LEDS; i++) { | |
763 | struct tca6507_led *l = tca->leds + i; | |
764 | ||
765 | l->chip = tca; | |
766 | l->num = i; | |
767 | if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) { | |
768 | l->led_cdev.name = pdata->leds.leds[i].name; | |
769 | l->led_cdev.default_trigger | |
770 | = pdata->leds.leds[i].default_trigger; | |
771 | l->led_cdev.brightness_set = tca6507_brightness_set; | |
772 | l->led_cdev.blink_set = tca6507_blink_set; | |
773 | l->bank = -1; | |
774 | err = led_classdev_register(&client->dev, | |
775 | &l->led_cdev); | |
776 | if (err < 0) | |
777 | goto exit; | |
778 | } | |
779 | } | |
780 | err = tca6507_probe_gpios(client, tca, pdata); | |
781 | if (err) | |
782 | goto exit; | |
783 | /* set all registers to known state - zero */ | |
784 | tca->reg_set = 0x7f; | |
785 | schedule_work(&tca->work); | |
786 | ||
787 | return 0; | |
788 | exit: | |
920c4f4c | 789 | while (i--) { |
a6d511e5 N |
790 | if (tca->leds[i].led_cdev.name) |
791 | led_classdev_unregister(&tca->leds[i].led_cdev); | |
920c4f4c | 792 | } |
a6d511e5 N |
793 | return err; |
794 | } | |
795 | ||
678e8a6b | 796 | static int tca6507_remove(struct i2c_client *client) |
a6d511e5 N |
797 | { |
798 | int i; | |
799 | struct tca6507_chip *tca = i2c_get_clientdata(client); | |
800 | struct tca6507_led *tca_leds = tca->leds; | |
801 | ||
802 | for (i = 0; i < NUM_LEDS; i++) { | |
803 | if (tca_leds[i].led_cdev.name) | |
804 | led_classdev_unregister(&tca_leds[i].led_cdev); | |
805 | } | |
806 | tca6507_remove_gpio(tca); | |
807 | cancel_work_sync(&tca->work); | |
a6d511e5 N |
808 | |
809 | return 0; | |
810 | } | |
811 | ||
812 | static struct i2c_driver tca6507_driver = { | |
813 | .driver = { | |
814 | .name = "leds-tca6507", | |
815 | .owner = THIS_MODULE, | |
fbd9df28 | 816 | .of_match_table = of_match_ptr(of_tca6507_leds_match), |
a6d511e5 N |
817 | }, |
818 | .probe = tca6507_probe, | |
df07cf81 | 819 | .remove = tca6507_remove, |
a6d511e5 N |
820 | .id_table = tca6507_id, |
821 | }; | |
822 | ||
2e911767 | 823 | module_i2c_driver(tca6507_driver); |
a6d511e5 N |
824 | |
825 | MODULE_AUTHOR("NeilBrown <neilb@suse.de>"); | |
826 | MODULE_DESCRIPTION("TCA6507 LED/GPO driver"); | |
827 | MODULE_LICENSE("GPL v2"); |