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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 | 72 | * |
a6d511e5 | 73 | * |
1f431afd N |
74 | * An led-tca6507 device must be provided with platform data or |
75 | * configured via devicetree. | |
76 | * | |
77 | * The platform-data lists for each output: the name, default trigger, | |
78 | * and whether the signal is being used as a GPIO rather than an LED. | |
79 | * 'struct led_plaform_data' is used for this. If 'name' is NULL, the | |
80 | * output isn't used. If 'flags' is TCA6507_MAKE_GPIO, the output is | |
81 | * a GPO. The "struct led_platform_data" can be embedded in a "struct | |
82 | * tca6507_platform_data" which adds a 'gpio_base' for the GPIOs, and | |
83 | * a 'setup' callback which is called once the GPIOs are available. | |
84 | * | |
85 | * When configured via devicetree there is one child for each output. | |
86 | * The "reg" determines the output number and "compatible" determines | |
87 | * whether it is an LED or a GPIO. "linux,default-trigger" can set a | |
88 | * default trigger. | |
a6d511e5 N |
89 | */ |
90 | ||
91 | #include <linux/module.h> | |
92 | #include <linux/slab.h> | |
93 | #include <linux/leds.h> | |
94 | #include <linux/err.h> | |
95 | #include <linux/i2c.h> | |
96 | #include <linux/gpio.h> | |
97 | #include <linux/workqueue.h> | |
98 | #include <linux/leds-tca6507.h> | |
fbd9df28 | 99 | #include <linux/of.h> |
a6d511e5 N |
100 | |
101 | /* LED select registers determine the source that drives LED outputs */ | |
102 | #define TCA6507_LS_LED_OFF 0x0 /* Output HI-Z (off) */ | |
103 | #define TCA6507_LS_LED_OFF1 0x1 /* Output HI-Z (off) - not used */ | |
104 | #define TCA6507_LS_LED_PWM0 0x2 /* Output LOW with Bank0 rate */ | |
105 | #define TCA6507_LS_LED_PWM1 0x3 /* Output LOW with Bank1 rate */ | |
106 | #define TCA6507_LS_LED_ON 0x4 /* Output LOW (on) */ | |
107 | #define TCA6507_LS_LED_MIR 0x5 /* Output LOW with Master Intensity */ | |
108 | #define TCA6507_LS_BLINK0 0x6 /* Blink at Bank0 rate */ | |
109 | #define TCA6507_LS_BLINK1 0x7 /* Blink at Bank1 rate */ | |
110 | ||
111 | enum { | |
112 | BANK0, | |
113 | BANK1, | |
114 | MASTER, | |
115 | }; | |
116 | static int bank_source[3] = { | |
117 | TCA6507_LS_LED_PWM0, | |
118 | TCA6507_LS_LED_PWM1, | |
119 | TCA6507_LS_LED_MIR, | |
120 | }; | |
121 | static int blink_source[2] = { | |
122 | TCA6507_LS_BLINK0, | |
123 | TCA6507_LS_BLINK1, | |
124 | }; | |
125 | ||
126 | /* PWM registers */ | |
127 | #define TCA6507_REG_CNT 11 | |
128 | ||
129 | /* | |
130 | * 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output | |
131 | * owns one bit in each register | |
132 | */ | |
133 | #define TCA6507_FADE_ON 0x03 | |
134 | #define TCA6507_FULL_ON 0x04 | |
135 | #define TCA6507_FADE_OFF 0x05 | |
136 | #define TCA6507_FIRST_OFF 0x06 | |
137 | #define TCA6507_SECOND_OFF 0x07 | |
138 | #define TCA6507_MAX_INTENSITY 0x08 | |
139 | #define TCA6507_MASTER_INTENSITY 0x09 | |
140 | #define TCA6507_INITIALIZE 0x0A | |
141 | ||
142 | #define INIT_CODE 0x8 | |
143 | ||
144 | #define TIMECODES 16 | |
145 | static int time_codes[TIMECODES] = { | |
146 | 0, 64, 128, 192, 256, 384, 512, 768, | |
147 | 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320 | |
148 | }; | |
149 | ||
150 | /* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */ | |
151 | static inline int TO_LEVEL(int brightness) | |
152 | { | |
153 | return brightness >> 4; | |
154 | } | |
155 | ||
156 | /* ...and convert back */ | |
157 | static inline int TO_BRIGHT(int level) | |
158 | { | |
159 | if (level) | |
160 | return (level << 4) | 0xf; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | #define NUM_LEDS 7 | |
165 | struct tca6507_chip { | |
166 | int reg_set; /* One bit per register where | |
167 | * a '1' means the register | |
168 | * should be written */ | |
169 | u8 reg_file[TCA6507_REG_CNT]; | |
170 | /* Bank 2 is Master Intensity and doesn't use times */ | |
171 | struct bank { | |
172 | int level; | |
173 | int ontime, offtime; | |
174 | int on_dflt, off_dflt; | |
175 | int time_use, level_use; | |
176 | } bank[3]; | |
177 | struct i2c_client *client; | |
178 | struct work_struct work; | |
179 | spinlock_t lock; | |
180 | ||
181 | struct tca6507_led { | |
182 | struct tca6507_chip *chip; | |
183 | struct led_classdev led_cdev; | |
184 | int num; | |
185 | int ontime, offtime; | |
186 | int on_dflt, off_dflt; | |
187 | int bank; /* Bank used, or -1 */ | |
188 | int blink; /* Set if hardware-blinking */ | |
189 | } leds[NUM_LEDS]; | |
190 | #ifdef CONFIG_GPIOLIB | |
191 | struct gpio_chip gpio; | |
192 | const char *gpio_name[NUM_LEDS]; | |
193 | int gpio_map[NUM_LEDS]; | |
194 | #endif | |
195 | }; | |
196 | ||
197 | static const struct i2c_device_id tca6507_id[] = { | |
198 | { "tca6507" }, | |
199 | { } | |
200 | }; | |
201 | MODULE_DEVICE_TABLE(i2c, tca6507_id); | |
202 | ||
203 | static int choose_times(int msec, int *c1p, int *c2p) | |
204 | { | |
205 | /* | |
1f431afd N |
206 | * Choose two timecodes which add to 'msec' as near as |
207 | * possible. The first returned is the 'on' or 'off' time. | |
208 | * The second is to be used as a 'fade-on' or 'fade-off' time. | |
209 | * If 'msec' is even, the first will not be smaller than the | |
210 | * second. If 'msec' is odd, the first will not be larger | |
211 | * than the second. | |
212 | * If we cannot get a sum within 1/8 of 'msec' fail with | |
213 | * -EINVAL, otherwise return the sum that was achieved, plus 1 | |
214 | * if the first is smaller. | |
215 | * If two possibilities are equally good (e.g. 512+0, | |
216 | * 256+256), choose the first pair so there is more | |
217 | * change-time visible (i.e. it is softer). | |
a6d511e5 N |
218 | */ |
219 | int c1, c2; | |
220 | int tmax = msec * 9 / 8; | |
221 | int tmin = msec * 7 / 8; | |
222 | int diff = 65536; | |
223 | ||
224 | /* We start at '1' to ensure we never even think of choosing a | |
225 | * total time of '0'. | |
226 | */ | |
227 | for (c1 = 1; c1 < TIMECODES; c1++) { | |
228 | int t = time_codes[c1]; | |
229 | if (t*2 < tmin) | |
230 | continue; | |
231 | if (t > tmax) | |
232 | break; | |
233 | for (c2 = 0; c2 <= c1; c2++) { | |
234 | int tt = t + time_codes[c2]; | |
235 | int d; | |
236 | if (tt < tmin) | |
237 | continue; | |
238 | if (tt > tmax) | |
239 | break; | |
240 | /* This works! */ | |
241 | d = abs(msec - tt); | |
242 | if (d >= diff) | |
243 | continue; | |
244 | /* Best yet */ | |
245 | *c1p = c1; | |
246 | *c2p = c2; | |
247 | diff = d; | |
248 | if (d == 0) | |
249 | return msec; | |
250 | } | |
251 | } | |
252 | if (diff < 65536) { | |
253 | int actual; | |
254 | if (msec & 1) { | |
255 | c1 = *c2p; | |
256 | *c2p = *c1p; | |
257 | *c1p = c1; | |
258 | } | |
259 | actual = time_codes[*c1p] + time_codes[*c2p]; | |
260 | if (*c1p < *c2p) | |
261 | return actual + 1; | |
262 | else | |
263 | return actual; | |
264 | } | |
265 | /* No close match */ | |
266 | return -EINVAL; | |
267 | } | |
268 | ||
269 | /* | |
1f431afd N |
270 | * Update the register file with the appropriate 3-bit state for the |
271 | * given led. | |
a6d511e5 N |
272 | */ |
273 | static void set_select(struct tca6507_chip *tca, int led, int val) | |
274 | { | |
275 | int mask = (1 << led); | |
276 | int bit; | |
277 | ||
278 | for (bit = 0; bit < 3; bit++) { | |
279 | int n = tca->reg_file[bit] & ~mask; | |
280 | if (val & (1 << bit)) | |
281 | n |= mask; | |
282 | if (tca->reg_file[bit] != n) { | |
283 | tca->reg_file[bit] = n; | |
284 | tca->reg_set |= (1 << bit); | |
285 | } | |
286 | } | |
287 | } | |
288 | ||
1f431afd N |
289 | /* Update the register file with the appropriate 4-bit code for one |
290 | * bank or other. This can be used for timers, for levels, or for | |
291 | * initialization. | |
a6d511e5 N |
292 | */ |
293 | static void set_code(struct tca6507_chip *tca, int reg, int bank, int new) | |
294 | { | |
295 | int mask = 0xF; | |
296 | int n; | |
297 | if (bank) { | |
298 | mask <<= 4; | |
299 | new <<= 4; | |
300 | } | |
301 | n = tca->reg_file[reg] & ~mask; | |
302 | n |= new; | |
303 | if (tca->reg_file[reg] != n) { | |
304 | tca->reg_file[reg] = n; | |
305 | tca->reg_set |= 1 << reg; | |
306 | } | |
307 | } | |
308 | ||
309 | /* Update brightness level. */ | |
310 | static void set_level(struct tca6507_chip *tca, int bank, int level) | |
311 | { | |
312 | switch (bank) { | |
313 | case BANK0: | |
314 | case BANK1: | |
315 | set_code(tca, TCA6507_MAX_INTENSITY, bank, level); | |
316 | break; | |
317 | case MASTER: | |
318 | set_code(tca, TCA6507_MASTER_INTENSITY, 0, level); | |
319 | break; | |
320 | } | |
321 | tca->bank[bank].level = level; | |
322 | } | |
323 | ||
1f431afd | 324 | /* Record all relevant time codes for a given bank */ |
a6d511e5 N |
325 | static void set_times(struct tca6507_chip *tca, int bank) |
326 | { | |
327 | int c1, c2; | |
328 | int result; | |
329 | ||
330 | result = choose_times(tca->bank[bank].ontime, &c1, &c2); | |
4a91c45e DC |
331 | if (result < 0) |
332 | return; | |
a6d511e5 | 333 | dev_dbg(&tca->client->dev, |
1f431afd N |
334 | "Chose on times %d(%d) %d(%d) for %dms\n", |
335 | c1, time_codes[c1], | |
a6d511e5 N |
336 | c2, time_codes[c2], tca->bank[bank].ontime); |
337 | set_code(tca, TCA6507_FADE_ON, bank, c2); | |
338 | set_code(tca, TCA6507_FULL_ON, bank, c1); | |
339 | tca->bank[bank].ontime = result; | |
340 | ||
341 | result = choose_times(tca->bank[bank].offtime, &c1, &c2); | |
342 | dev_dbg(&tca->client->dev, | |
1f431afd N |
343 | "Chose off times %d(%d) %d(%d) for %dms\n", |
344 | c1, time_codes[c1], | |
a6d511e5 N |
345 | c2, time_codes[c2], tca->bank[bank].offtime); |
346 | set_code(tca, TCA6507_FADE_OFF, bank, c2); | |
347 | set_code(tca, TCA6507_FIRST_OFF, bank, c1); | |
348 | set_code(tca, TCA6507_SECOND_OFF, bank, c1); | |
349 | tca->bank[bank].offtime = result; | |
350 | ||
351 | set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE); | |
352 | } | |
353 | ||
354 | /* Write all needed register of tca6507 */ | |
355 | ||
356 | static void tca6507_work(struct work_struct *work) | |
357 | { | |
358 | struct tca6507_chip *tca = container_of(work, struct tca6507_chip, | |
359 | work); | |
360 | struct i2c_client *cl = tca->client; | |
361 | int set; | |
362 | u8 file[TCA6507_REG_CNT]; | |
363 | int r; | |
364 | ||
365 | spin_lock_irq(&tca->lock); | |
366 | set = tca->reg_set; | |
367 | memcpy(file, tca->reg_file, TCA6507_REG_CNT); | |
368 | tca->reg_set = 0; | |
369 | spin_unlock_irq(&tca->lock); | |
370 | ||
371 | for (r = 0; r < TCA6507_REG_CNT; r++) | |
372 | if (set & (1<<r)) | |
373 | i2c_smbus_write_byte_data(cl, r, file[r]); | |
374 | } | |
375 | ||
376 | static void led_release(struct tca6507_led *led) | |
377 | { | |
378 | /* If led owns any resource, release it. */ | |
379 | struct tca6507_chip *tca = led->chip; | |
380 | if (led->bank >= 0) { | |
381 | struct bank *b = tca->bank + led->bank; | |
382 | if (led->blink) | |
383 | b->time_use--; | |
384 | b->level_use--; | |
385 | } | |
386 | led->blink = 0; | |
387 | led->bank = -1; | |
388 | } | |
389 | ||
390 | static int led_prepare(struct tca6507_led *led) | |
391 | { | |
1f431afd N |
392 | /* Assign this led to a bank, configuring that bank if |
393 | * necessary. */ | |
a6d511e5 N |
394 | int level = TO_LEVEL(led->led_cdev.brightness); |
395 | struct tca6507_chip *tca = led->chip; | |
396 | int c1, c2; | |
397 | int i; | |
398 | struct bank *b; | |
399 | int need_init = 0; | |
400 | ||
401 | led->led_cdev.brightness = TO_BRIGHT(level); | |
402 | if (level == 0) { | |
403 | set_select(tca, led->num, TCA6507_LS_LED_OFF); | |
404 | return 0; | |
405 | } | |
406 | ||
407 | if (led->ontime == 0 || led->offtime == 0) { | |
408 | /* | |
1f431afd N |
409 | * Just set the brightness, choosing first usable |
410 | * bank. If none perfect, choose best. Count | |
411 | * backwards so we check MASTER bank first to avoid | |
412 | * wasting a timer. | |
a6d511e5 N |
413 | */ |
414 | int best = -1;/* full-on */ | |
415 | int diff = 15-level; | |
416 | ||
417 | if (level == 15) { | |
418 | set_select(tca, led->num, TCA6507_LS_LED_ON); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | for (i = MASTER; i >= BANK0; i--) { | |
423 | int d; | |
424 | if (tca->bank[i].level == level || | |
425 | tca->bank[i].level_use == 0) { | |
426 | best = i; | |
427 | break; | |
428 | } | |
429 | d = abs(level - tca->bank[i].level); | |
430 | if (d < diff) { | |
431 | diff = d; | |
432 | best = i; | |
433 | } | |
434 | } | |
435 | if (best == -1) { | |
436 | /* Best brightness is full-on */ | |
437 | set_select(tca, led->num, TCA6507_LS_LED_ON); | |
438 | led->led_cdev.brightness = LED_FULL; | |
439 | return 0; | |
440 | } | |
441 | ||
442 | if (!tca->bank[best].level_use) | |
443 | set_level(tca, best, level); | |
444 | ||
445 | tca->bank[best].level_use++; | |
446 | led->bank = best; | |
447 | set_select(tca, led->num, bank_source[best]); | |
448 | led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | /* | |
1f431afd N |
453 | * We have on/off time so we need to try to allocate a timing |
454 | * bank. First check if times are compatible with hardware | |
455 | * and give up if not. | |
a6d511e5 N |
456 | */ |
457 | if (choose_times(led->ontime, &c1, &c2) < 0) | |
458 | return -EINVAL; | |
459 | if (choose_times(led->offtime, &c1, &c2) < 0) | |
460 | return -EINVAL; | |
461 | ||
462 | for (i = BANK0; i <= BANK1; i++) { | |
463 | if (tca->bank[i].level_use == 0) | |
464 | /* not in use - it is ours! */ | |
465 | break; | |
466 | if (tca->bank[i].level != level) | |
467 | /* Incompatible level - skip */ | |
468 | /* FIX: if timer matches we maybe should consider | |
469 | * this anyway... | |
470 | */ | |
471 | continue; | |
472 | ||
473 | if (tca->bank[i].time_use == 0) | |
474 | /* Timer not in use, and level matches - use it */ | |
475 | break; | |
476 | ||
477 | if (!(tca->bank[i].on_dflt || | |
478 | led->on_dflt || | |
479 | tca->bank[i].ontime == led->ontime)) | |
480 | /* on time is incompatible */ | |
481 | continue; | |
482 | ||
483 | if (!(tca->bank[i].off_dflt || | |
484 | led->off_dflt || | |
485 | tca->bank[i].offtime == led->offtime)) | |
486 | /* off time is incompatible */ | |
487 | continue; | |
488 | ||
489 | /* looks like a suitable match */ | |
490 | break; | |
491 | } | |
492 | ||
493 | if (i > BANK1) | |
494 | /* Nothing matches - how sad */ | |
495 | return -EINVAL; | |
496 | ||
497 | b = &tca->bank[i]; | |
498 | if (b->level_use == 0) | |
499 | set_level(tca, i, level); | |
500 | b->level_use++; | |
501 | led->bank = i; | |
502 | ||
503 | if (b->on_dflt || | |
504 | !led->on_dflt || | |
505 | b->time_use == 0) { | |
506 | b->ontime = led->ontime; | |
507 | b->on_dflt = led->on_dflt; | |
508 | need_init = 1; | |
509 | } | |
510 | ||
511 | if (b->off_dflt || | |
512 | !led->off_dflt || | |
513 | b->time_use == 0) { | |
514 | b->offtime = led->offtime; | |
515 | b->off_dflt = led->off_dflt; | |
516 | need_init = 1; | |
517 | } | |
518 | ||
519 | if (need_init) | |
520 | set_times(tca, i); | |
521 | ||
522 | led->ontime = b->ontime; | |
523 | led->offtime = b->offtime; | |
524 | ||
525 | b->time_use++; | |
526 | led->blink = 1; | |
527 | led->led_cdev.brightness = TO_BRIGHT(b->level); | |
528 | set_select(tca, led->num, blink_source[i]); | |
529 | return 0; | |
530 | } | |
531 | ||
532 | static int led_assign(struct tca6507_led *led) | |
533 | { | |
534 | struct tca6507_chip *tca = led->chip; | |
535 | int err; | |
536 | unsigned long flags; | |
537 | ||
538 | spin_lock_irqsave(&tca->lock, flags); | |
539 | led_release(led); | |
540 | err = led_prepare(led); | |
541 | if (err) { | |
542 | /* | |
1f431afd N |
543 | * Can only fail on timer setup. In that case we need |
544 | * to re-establish as steady level. | |
a6d511e5 N |
545 | */ |
546 | led->ontime = 0; | |
547 | led->offtime = 0; | |
548 | led_prepare(led); | |
549 | } | |
550 | spin_unlock_irqrestore(&tca->lock, flags); | |
551 | ||
552 | if (tca->reg_set) | |
553 | schedule_work(&tca->work); | |
554 | return err; | |
555 | } | |
556 | ||
557 | static void tca6507_brightness_set(struct led_classdev *led_cdev, | |
558 | enum led_brightness brightness) | |
559 | { | |
560 | struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, | |
561 | led_cdev); | |
562 | led->led_cdev.brightness = brightness; | |
563 | led->ontime = 0; | |
564 | led->offtime = 0; | |
565 | led_assign(led); | |
566 | } | |
567 | ||
568 | static int tca6507_blink_set(struct led_classdev *led_cdev, | |
569 | unsigned long *delay_on, | |
570 | unsigned long *delay_off) | |
571 | { | |
572 | struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, | |
573 | led_cdev); | |
574 | ||
575 | if (*delay_on == 0) | |
576 | led->on_dflt = 1; | |
577 | else if (delay_on != &led_cdev->blink_delay_on) | |
578 | led->on_dflt = 0; | |
579 | led->ontime = *delay_on; | |
580 | ||
581 | if (*delay_off == 0) | |
582 | led->off_dflt = 1; | |
583 | else if (delay_off != &led_cdev->blink_delay_off) | |
584 | led->off_dflt = 0; | |
585 | led->offtime = *delay_off; | |
586 | ||
587 | if (led->ontime == 0) | |
588 | led->ontime = 512; | |
589 | if (led->offtime == 0) | |
590 | led->offtime = 512; | |
591 | ||
592 | if (led->led_cdev.brightness == LED_OFF) | |
593 | led->led_cdev.brightness = LED_FULL; | |
594 | if (led_assign(led) < 0) { | |
595 | led->ontime = 0; | |
596 | led->offtime = 0; | |
597 | led->led_cdev.brightness = LED_OFF; | |
598 | return -EINVAL; | |
599 | } | |
600 | *delay_on = led->ontime; | |
601 | *delay_off = led->offtime; | |
602 | return 0; | |
603 | } | |
604 | ||
605 | #ifdef CONFIG_GPIOLIB | |
606 | static void tca6507_gpio_set_value(struct gpio_chip *gc, | |
607 | unsigned offset, int val) | |
608 | { | |
2a664343 | 609 | struct tca6507_chip *tca = gpiochip_get_data(gc); |
a6d511e5 N |
610 | unsigned long flags; |
611 | ||
612 | spin_lock_irqsave(&tca->lock, flags); | |
613 | /* | |
1f431afd N |
614 | * 'OFF' is floating high, and 'ON' is pulled down, so it has |
615 | * the inverse sense of 'val'. | |
a6d511e5 N |
616 | */ |
617 | set_select(tca, tca->gpio_map[offset], | |
618 | val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON); | |
619 | spin_unlock_irqrestore(&tca->lock, flags); | |
620 | if (tca->reg_set) | |
621 | schedule_work(&tca->work); | |
622 | } | |
623 | ||
624 | static int tca6507_gpio_direction_output(struct gpio_chip *gc, | |
625 | unsigned offset, int val) | |
626 | { | |
627 | tca6507_gpio_set_value(gc, offset, val); | |
628 | return 0; | |
629 | } | |
630 | ||
631 | static int tca6507_probe_gpios(struct i2c_client *client, | |
632 | struct tca6507_chip *tca, | |
633 | struct tca6507_platform_data *pdata) | |
634 | { | |
635 | int err; | |
636 | int i = 0; | |
637 | int gpios = 0; | |
638 | ||
639 | for (i = 0; i < NUM_LEDS; i++) | |
640 | if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) { | |
641 | /* Configure as a gpio */ | |
642 | tca->gpio_name[gpios] = pdata->leds.leds[i].name; | |
643 | tca->gpio_map[gpios] = i; | |
644 | gpios++; | |
645 | } | |
646 | ||
647 | if (!gpios) | |
648 | return 0; | |
649 | ||
650 | tca->gpio.label = "gpio-tca6507"; | |
651 | tca->gpio.names = tca->gpio_name; | |
652 | tca->gpio.ngpio = gpios; | |
653 | tca->gpio.base = pdata->gpio_base; | |
654 | tca->gpio.owner = THIS_MODULE; | |
655 | tca->gpio.direction_output = tca6507_gpio_direction_output; | |
656 | tca->gpio.set = tca6507_gpio_set_value; | |
58383c78 | 657 | tca->gpio.parent = &client->dev; |
10ead6e5 N |
658 | #ifdef CONFIG_OF_GPIO |
659 | tca->gpio.of_node = of_node_get(client->dev.of_node); | |
660 | #endif | |
2a664343 | 661 | err = gpiochip_add_data(&tca->gpio, tca); |
a6d511e5 N |
662 | if (err) { |
663 | tca->gpio.ngpio = 0; | |
664 | return err; | |
665 | } | |
666 | if (pdata->setup) | |
667 | pdata->setup(tca->gpio.base, tca->gpio.ngpio); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
672 | { | |
88d5e520 | 673 | if (tca->gpio.ngpio) |
674 | gpiochip_remove(&tca->gpio); | |
a6d511e5 N |
675 | } |
676 | #else /* CONFIG_GPIOLIB */ | |
677 | static int tca6507_probe_gpios(struct i2c_client *client, | |
678 | struct tca6507_chip *tca, | |
679 | struct tca6507_platform_data *pdata) | |
680 | { | |
681 | return 0; | |
682 | } | |
683 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
684 | { | |
685 | } | |
686 | #endif /* CONFIG_GPIOLIB */ | |
687 | ||
0c596a7e MB |
688 | #ifdef CONFIG_OF |
689 | static struct tca6507_platform_data * | |
690 | tca6507_led_dt_init(struct i2c_client *client) | |
691 | { | |
692 | struct device_node *np = client->dev.of_node, *child; | |
693 | struct tca6507_platform_data *pdata; | |
694 | struct led_info *tca_leds; | |
ef754e88 | 695 | int count; |
0c596a7e | 696 | |
ef754e88 AL |
697 | count = of_get_child_count(np); |
698 | if (!count || count > NUM_LEDS) | |
0c596a7e MB |
699 | return ERR_PTR(-ENODEV); |
700 | ||
a86854d0 KC |
701 | tca_leds = devm_kcalloc(&client->dev, |
702 | NUM_LEDS, sizeof(struct led_info), GFP_KERNEL); | |
0c596a7e MB |
703 | if (!tca_leds) |
704 | return ERR_PTR(-ENOMEM); | |
705 | ||
706 | for_each_child_of_node(np, child) { | |
707 | struct led_info led; | |
708 | u32 reg; | |
709 | int ret; | |
710 | ||
711 | led.name = | |
712 | of_get_property(child, "label", NULL) ? : child->name; | |
713 | led.default_trigger = | |
714 | of_get_property(child, "linux,default-trigger", NULL); | |
9334129e | 715 | led.flags = 0; |
10ead6e5 N |
716 | if (of_property_match_string(child, "compatible", "gpio") >= 0) |
717 | led.flags |= TCA6507_MAKE_GPIO; | |
0c596a7e | 718 | ret = of_property_read_u32(child, "reg", ®); |
94bf9e0c | 719 | if (ret != 0 || reg >= NUM_LEDS) |
0c596a7e MB |
720 | continue; |
721 | ||
722 | tca_leds[reg] = led; | |
723 | } | |
724 | pdata = devm_kzalloc(&client->dev, | |
725 | sizeof(struct tca6507_platform_data), GFP_KERNEL); | |
726 | if (!pdata) | |
727 | return ERR_PTR(-ENOMEM); | |
728 | ||
729 | pdata->leds.leds = tca_leds; | |
9334129e | 730 | pdata->leds.num_leds = NUM_LEDS; |
33ca1532 | 731 | #ifdef CONFIG_GPIOLIB |
10ead6e5 | 732 | pdata->gpio_base = -1; |
33ca1532 | 733 | #endif |
0c596a7e MB |
734 | return pdata; |
735 | } | |
736 | ||
737 | static const struct of_device_id of_tca6507_leds_match[] = { | |
738 | { .compatible = "ti,tca6507", }, | |
739 | {}, | |
740 | }; | |
4d59ed85 | 741 | MODULE_DEVICE_TABLE(of, of_tca6507_leds_match); |
0c596a7e MB |
742 | |
743 | #else | |
744 | static struct tca6507_platform_data * | |
745 | tca6507_led_dt_init(struct i2c_client *client) | |
746 | { | |
747 | return ERR_PTR(-ENODEV); | |
748 | } | |
749 | ||
0c596a7e MB |
750 | #endif |
751 | ||
98ea1ea2 | 752 | static int tca6507_probe(struct i2c_client *client, |
0c596a7e | 753 | const struct i2c_device_id *id) |
a6d511e5 N |
754 | { |
755 | struct tca6507_chip *tca; | |
756 | struct i2c_adapter *adapter; | |
757 | struct tca6507_platform_data *pdata; | |
758 | int err; | |
759 | int i = 0; | |
760 | ||
761 | adapter = to_i2c_adapter(client->dev.parent); | |
87aae1ea | 762 | pdata = dev_get_platdata(&client->dev); |
a6d511e5 N |
763 | |
764 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) | |
765 | return -EIO; | |
766 | ||
767 | if (!pdata || pdata->leds.num_leds != NUM_LEDS) { | |
0c596a7e MB |
768 | pdata = tca6507_led_dt_init(client); |
769 | if (IS_ERR(pdata)) { | |
770 | dev_err(&client->dev, "Need %d entries in platform-data list\n", | |
771 | NUM_LEDS); | |
772 | return PTR_ERR(pdata); | |
773 | } | |
a6d511e5 | 774 | } |
6770fc60 | 775 | tca = devm_kzalloc(&client->dev, sizeof(*tca), GFP_KERNEL); |
a6d511e5 | 776 | if (!tca) |
920c4f4c | 777 | return -ENOMEM; |
a6d511e5 N |
778 | |
779 | tca->client = client; | |
780 | INIT_WORK(&tca->work, tca6507_work); | |
781 | spin_lock_init(&tca->lock); | |
782 | i2c_set_clientdata(client, tca); | |
783 | ||
784 | for (i = 0; i < NUM_LEDS; i++) { | |
785 | struct tca6507_led *l = tca->leds + i; | |
786 | ||
787 | l->chip = tca; | |
788 | l->num = i; | |
789 | if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) { | |
790 | l->led_cdev.name = pdata->leds.leds[i].name; | |
791 | l->led_cdev.default_trigger | |
792 | = pdata->leds.leds[i].default_trigger; | |
793 | l->led_cdev.brightness_set = tca6507_brightness_set; | |
794 | l->led_cdev.blink_set = tca6507_blink_set; | |
795 | l->bank = -1; | |
796 | err = led_classdev_register(&client->dev, | |
797 | &l->led_cdev); | |
798 | if (err < 0) | |
799 | goto exit; | |
800 | } | |
801 | } | |
802 | err = tca6507_probe_gpios(client, tca, pdata); | |
803 | if (err) | |
804 | goto exit; | |
805 | /* set all registers to known state - zero */ | |
806 | tca->reg_set = 0x7f; | |
807 | schedule_work(&tca->work); | |
808 | ||
809 | return 0; | |
810 | exit: | |
920c4f4c | 811 | while (i--) { |
a6d511e5 N |
812 | if (tca->leds[i].led_cdev.name) |
813 | led_classdev_unregister(&tca->leds[i].led_cdev); | |
920c4f4c | 814 | } |
a6d511e5 N |
815 | return err; |
816 | } | |
817 | ||
678e8a6b | 818 | static int tca6507_remove(struct i2c_client *client) |
a6d511e5 N |
819 | { |
820 | int i; | |
821 | struct tca6507_chip *tca = i2c_get_clientdata(client); | |
822 | struct tca6507_led *tca_leds = tca->leds; | |
823 | ||
824 | for (i = 0; i < NUM_LEDS; i++) { | |
825 | if (tca_leds[i].led_cdev.name) | |
826 | led_classdev_unregister(&tca_leds[i].led_cdev); | |
827 | } | |
828 | tca6507_remove_gpio(tca); | |
829 | cancel_work_sync(&tca->work); | |
a6d511e5 N |
830 | |
831 | return 0; | |
832 | } | |
833 | ||
834 | static struct i2c_driver tca6507_driver = { | |
835 | .driver = { | |
836 | .name = "leds-tca6507", | |
fbd9df28 | 837 | .of_match_table = of_match_ptr(of_tca6507_leds_match), |
a6d511e5 N |
838 | }, |
839 | .probe = tca6507_probe, | |
df07cf81 | 840 | .remove = tca6507_remove, |
a6d511e5 N |
841 | .id_table = tca6507_id, |
842 | }; | |
843 | ||
2e911767 | 844 | module_i2c_driver(tca6507_driver); |
a6d511e5 N |
845 | |
846 | MODULE_AUTHOR("NeilBrown <neilb@suse.de>"); | |
847 | MODULE_DESCRIPTION("TCA6507 LED/GPO driver"); | |
848 | MODULE_LICENSE("GPL v2"); |