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. | |
1f431afd N |
7 | * The modulation can be varied in a simple pattern to produce a |
8 | * blink or double-blink. | |
a6d511e5 | 9 | * |
1f431afd N |
10 | * This driver can configure each line either as a 'GPIO' which is |
11 | * out-only (pull-up resistor required) or as an LED with variable | |
12 | * brightness and hardware-assisted blinking. | |
a6d511e5 | 13 | * |
1f431afd N |
14 | * Apart from OFF and ON there are three programmable brightness |
15 | * levels which can be programmed from 0 to 15 and indicate how many | |
16 | * 500usec intervals in each 8msec that the led is 'on'. The levels | |
17 | * are named MASTER, BANK0 and BANK1. | |
a6d511e5 | 18 | * |
1f431afd N |
19 | * There are two different blink rates that can be programmed, each |
20 | * with separate time for rise, on, fall, off and second-off. Thus if | |
21 | * 3 or more different non-trivial rates are required, software must | |
22 | * be used for the extra rates. The two different blink rates must | |
23 | * align with the two levels BANK0 and BANK1. This driver does not | |
24 | * support double-blink so 'second-off' always matches 'off'. | |
a6d511e5 | 25 | * |
1f431afd N |
26 | * Only 16 different times can be programmed in a roughly logarithmic |
27 | * scale from 64ms to 16320ms. To be precise the possible times are: | |
a6d511e5 N |
28 | * 0, 64, 128, 192, 256, 384, 512, 768, |
29 | * 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320 | |
30 | * | |
1f431afd N |
31 | * Times that cannot be closely matched with these must be handled in |
32 | * software. This driver allows 12.5% error in matching. | |
a6d511e5 | 33 | * |
1f431afd N |
34 | * This driver does not allow rise/fall rates to be set explicitly. |
35 | * When trying to match a given 'on' or 'off' period, an appropriate | |
36 | * pair of 'change' and 'hold' times are chosen to get a close match. | |
37 | * If the target delay is even, the 'change' number will be the | |
38 | * smaller; if odd, the 'hold' number will be the smaller. | |
39 | ||
40 | * Choosing pairs of delays with 12.5% errors allows us to match | |
41 | * delays in the ranges: 56-72, 112-144, 168-216, 224-27504, | |
42 | * 28560-36720. | |
43 | * 26% of the achievable sums can be matched by multiple pairings. | |
44 | * For example 1536 == 1536+0, 1024+512, or 768+768. | |
45 | * This driver will always choose the pairing with the least | |
46 | * maximum - 768+768 in this case. Other pairings are not available. | |
a6d511e5 | 47 | * |
1f431afd N |
48 | * Access to the 3 levels and 2 blinks are on a first-come, |
49 | * first-served basis. Access can be shared by multiple leds if they | |
50 | * have the same level and either same blink rates, or some don't | |
51 | * blink. When a led changes, it relinquishes access and tries again, | |
52 | * so it might lose access to hardware blink. | |
a6d511e5 | 53 | * |
1f431afd N |
54 | * If a blink engine cannot be allocated, software blink is used. If |
55 | * the desired brightness cannot be allocated, the closest available | |
56 | * non-zero brightness is used. As 'full' is always available, the | |
57 | * worst case would be to have two different blink rates at '1', with | |
58 | * Max at '2', then other leds will have to choose between '2' and | |
59 | * '16'. Hopefully this is not likely. | |
a6d511e5 | 60 | * |
1f431afd N |
61 | * Each bank (BANK0 and BANK1) has two usage counts - LEDs using the |
62 | * brightness and LEDs using the blink. It can only be reprogrammed | |
63 | * when the appropriate counter is zero. The MASTER level has a | |
64 | * single usage count. | |
a6d511e5 | 65 | * |
1f431afd N |
66 | * Each LED has programmable 'on' and 'off' time as milliseconds. |
67 | * With each there is a flag saying if it was explicitly requested or | |
68 | * defaulted. Similarly the banks know if each time was explicit or a | |
69 | * default. Defaults are permitted to be changed freely - they are | |
70 | * not recognised when matching. | |
a6d511e5 | 71 | * |
a6d511e5 | 72 | * |
1f431afd N |
73 | * An led-tca6507 device must be provided with platform data or |
74 | * configured via devicetree. | |
75 | * | |
76 | * The platform-data lists for each output: the name, default trigger, | |
77 | * and whether the signal is being used as a GPIO rather than an LED. | |
78 | * 'struct led_plaform_data' is used for this. If 'name' is NULL, the | |
79 | * output isn't used. If 'flags' is TCA6507_MAKE_GPIO, the output is | |
80 | * a GPO. The "struct led_platform_data" can be embedded in a "struct | |
81 | * tca6507_platform_data" which adds a 'gpio_base' for the GPIOs, and | |
82 | * a 'setup' callback which is called once the GPIOs are available. | |
83 | * | |
84 | * When configured via devicetree there is one child for each output. | |
85 | * The "reg" determines the output number and "compatible" determines | |
86 | * whether it is an LED or a GPIO. "linux,default-trigger" can set a | |
87 | * default trigger. | |
a6d511e5 N |
88 | */ |
89 | ||
90 | #include <linux/module.h> | |
91 | #include <linux/slab.h> | |
92 | #include <linux/leds.h> | |
93 | #include <linux/err.h> | |
94 | #include <linux/i2c.h> | |
95 | #include <linux/gpio.h> | |
96 | #include <linux/workqueue.h> | |
97 | #include <linux/leds-tca6507.h> | |
fbd9df28 | 98 | #include <linux/of.h> |
a6d511e5 N |
99 | |
100 | /* LED select registers determine the source that drives LED outputs */ | |
101 | #define TCA6507_LS_LED_OFF 0x0 /* Output HI-Z (off) */ | |
102 | #define TCA6507_LS_LED_OFF1 0x1 /* Output HI-Z (off) - not used */ | |
103 | #define TCA6507_LS_LED_PWM0 0x2 /* Output LOW with Bank0 rate */ | |
104 | #define TCA6507_LS_LED_PWM1 0x3 /* Output LOW with Bank1 rate */ | |
105 | #define TCA6507_LS_LED_ON 0x4 /* Output LOW (on) */ | |
106 | #define TCA6507_LS_LED_MIR 0x5 /* Output LOW with Master Intensity */ | |
107 | #define TCA6507_LS_BLINK0 0x6 /* Blink at Bank0 rate */ | |
108 | #define TCA6507_LS_BLINK1 0x7 /* Blink at Bank1 rate */ | |
109 | ||
110 | enum { | |
111 | BANK0, | |
112 | BANK1, | |
113 | MASTER, | |
114 | }; | |
115 | static int bank_source[3] = { | |
116 | TCA6507_LS_LED_PWM0, | |
117 | TCA6507_LS_LED_PWM1, | |
118 | TCA6507_LS_LED_MIR, | |
119 | }; | |
120 | static int blink_source[2] = { | |
121 | TCA6507_LS_BLINK0, | |
122 | TCA6507_LS_BLINK1, | |
123 | }; | |
124 | ||
125 | /* PWM registers */ | |
126 | #define TCA6507_REG_CNT 11 | |
127 | ||
128 | /* | |
129 | * 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output | |
130 | * owns one bit in each register | |
131 | */ | |
132 | #define TCA6507_FADE_ON 0x03 | |
133 | #define TCA6507_FULL_ON 0x04 | |
134 | #define TCA6507_FADE_OFF 0x05 | |
135 | #define TCA6507_FIRST_OFF 0x06 | |
136 | #define TCA6507_SECOND_OFF 0x07 | |
137 | #define TCA6507_MAX_INTENSITY 0x08 | |
138 | #define TCA6507_MASTER_INTENSITY 0x09 | |
139 | #define TCA6507_INITIALIZE 0x0A | |
140 | ||
141 | #define INIT_CODE 0x8 | |
142 | ||
143 | #define TIMECODES 16 | |
144 | static int time_codes[TIMECODES] = { | |
145 | 0, 64, 128, 192, 256, 384, 512, 768, | |
146 | 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320 | |
147 | }; | |
148 | ||
149 | /* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */ | |
150 | static inline int TO_LEVEL(int brightness) | |
151 | { | |
152 | return brightness >> 4; | |
153 | } | |
154 | ||
155 | /* ...and convert back */ | |
156 | static inline int TO_BRIGHT(int level) | |
157 | { | |
158 | if (level) | |
159 | return (level << 4) | 0xf; | |
160 | return 0; | |
161 | } | |
162 | ||
163 | #define NUM_LEDS 7 | |
164 | struct tca6507_chip { | |
165 | int reg_set; /* One bit per register where | |
166 | * a '1' means the register | |
167 | * should be written */ | |
168 | u8 reg_file[TCA6507_REG_CNT]; | |
169 | /* Bank 2 is Master Intensity and doesn't use times */ | |
170 | struct bank { | |
171 | int level; | |
172 | int ontime, offtime; | |
173 | int on_dflt, off_dflt; | |
174 | int time_use, level_use; | |
175 | } bank[3]; | |
176 | struct i2c_client *client; | |
177 | struct work_struct work; | |
178 | spinlock_t lock; | |
179 | ||
180 | struct tca6507_led { | |
181 | struct tca6507_chip *chip; | |
182 | struct led_classdev led_cdev; | |
183 | int num; | |
184 | int ontime, offtime; | |
185 | int on_dflt, off_dflt; | |
186 | int bank; /* Bank used, or -1 */ | |
187 | int blink; /* Set if hardware-blinking */ | |
188 | } leds[NUM_LEDS]; | |
189 | #ifdef CONFIG_GPIOLIB | |
190 | struct gpio_chip gpio; | |
191 | const char *gpio_name[NUM_LEDS]; | |
192 | int gpio_map[NUM_LEDS]; | |
193 | #endif | |
194 | }; | |
195 | ||
196 | static const struct i2c_device_id tca6507_id[] = { | |
197 | { "tca6507" }, | |
198 | { } | |
199 | }; | |
200 | MODULE_DEVICE_TABLE(i2c, tca6507_id); | |
201 | ||
202 | static int choose_times(int msec, int *c1p, int *c2p) | |
203 | { | |
204 | /* | |
1f431afd N |
205 | * Choose two timecodes which add to 'msec' as near as |
206 | * possible. The first returned is the 'on' or 'off' time. | |
207 | * The second is to be used as a 'fade-on' or 'fade-off' time. | |
208 | * If 'msec' is even, the first will not be smaller than the | |
209 | * second. If 'msec' is odd, the first will not be larger | |
210 | * than the second. | |
211 | * If we cannot get a sum within 1/8 of 'msec' fail with | |
212 | * -EINVAL, otherwise return the sum that was achieved, plus 1 | |
213 | * if the first is smaller. | |
214 | * If two possibilities are equally good (e.g. 512+0, | |
215 | * 256+256), choose the first pair so there is more | |
216 | * change-time visible (i.e. it is softer). | |
a6d511e5 N |
217 | */ |
218 | int c1, c2; | |
219 | int tmax = msec * 9 / 8; | |
220 | int tmin = msec * 7 / 8; | |
221 | int diff = 65536; | |
222 | ||
223 | /* We start at '1' to ensure we never even think of choosing a | |
224 | * total time of '0'. | |
225 | */ | |
226 | for (c1 = 1; c1 < TIMECODES; c1++) { | |
227 | int t = time_codes[c1]; | |
228 | if (t*2 < tmin) | |
229 | continue; | |
230 | if (t > tmax) | |
231 | break; | |
232 | for (c2 = 0; c2 <= c1; c2++) { | |
233 | int tt = t + time_codes[c2]; | |
234 | int d; | |
235 | if (tt < tmin) | |
236 | continue; | |
237 | if (tt > tmax) | |
238 | break; | |
239 | /* This works! */ | |
240 | d = abs(msec - tt); | |
241 | if (d >= diff) | |
242 | continue; | |
243 | /* Best yet */ | |
244 | *c1p = c1; | |
245 | *c2p = c2; | |
246 | diff = d; | |
247 | if (d == 0) | |
248 | return msec; | |
249 | } | |
250 | } | |
251 | if (diff < 65536) { | |
252 | int actual; | |
253 | if (msec & 1) { | |
254 | c1 = *c2p; | |
255 | *c2p = *c1p; | |
256 | *c1p = c1; | |
257 | } | |
258 | actual = time_codes[*c1p] + time_codes[*c2p]; | |
259 | if (*c1p < *c2p) | |
260 | return actual + 1; | |
261 | else | |
262 | return actual; | |
263 | } | |
264 | /* No close match */ | |
265 | return -EINVAL; | |
266 | } | |
267 | ||
268 | /* | |
1f431afd N |
269 | * Update the register file with the appropriate 3-bit state for the |
270 | * given led. | |
a6d511e5 N |
271 | */ |
272 | static void set_select(struct tca6507_chip *tca, int led, int val) | |
273 | { | |
274 | int mask = (1 << led); | |
275 | int bit; | |
276 | ||
277 | for (bit = 0; bit < 3; bit++) { | |
278 | int n = tca->reg_file[bit] & ~mask; | |
279 | if (val & (1 << bit)) | |
280 | n |= mask; | |
281 | if (tca->reg_file[bit] != n) { | |
282 | tca->reg_file[bit] = n; | |
283 | tca->reg_set |= (1 << bit); | |
284 | } | |
285 | } | |
286 | } | |
287 | ||
1f431afd N |
288 | /* Update the register file with the appropriate 4-bit code for one |
289 | * bank or other. This can be used for timers, for levels, or for | |
290 | * initialization. | |
a6d511e5 N |
291 | */ |
292 | static void set_code(struct tca6507_chip *tca, int reg, int bank, int new) | |
293 | { | |
294 | int mask = 0xF; | |
295 | int n; | |
296 | if (bank) { | |
297 | mask <<= 4; | |
298 | new <<= 4; | |
299 | } | |
300 | n = tca->reg_file[reg] & ~mask; | |
301 | n |= new; | |
302 | if (tca->reg_file[reg] != n) { | |
303 | tca->reg_file[reg] = n; | |
304 | tca->reg_set |= 1 << reg; | |
305 | } | |
306 | } | |
307 | ||
308 | /* Update brightness level. */ | |
309 | static void set_level(struct tca6507_chip *tca, int bank, int level) | |
310 | { | |
311 | switch (bank) { | |
312 | case BANK0: | |
313 | case BANK1: | |
314 | set_code(tca, TCA6507_MAX_INTENSITY, bank, level); | |
315 | break; | |
316 | case MASTER: | |
317 | set_code(tca, TCA6507_MASTER_INTENSITY, 0, level); | |
318 | break; | |
319 | } | |
320 | tca->bank[bank].level = level; | |
321 | } | |
322 | ||
1f431afd | 323 | /* Record all relevant time codes for a given bank */ |
a6d511e5 N |
324 | static void set_times(struct tca6507_chip *tca, int bank) |
325 | { | |
326 | int c1, c2; | |
327 | int result; | |
328 | ||
329 | result = choose_times(tca->bank[bank].ontime, &c1, &c2); | |
4a91c45e DC |
330 | if (result < 0) |
331 | return; | |
a6d511e5 | 332 | dev_dbg(&tca->client->dev, |
1f431afd N |
333 | "Chose on times %d(%d) %d(%d) for %dms\n", |
334 | c1, time_codes[c1], | |
a6d511e5 N |
335 | c2, time_codes[c2], tca->bank[bank].ontime); |
336 | set_code(tca, TCA6507_FADE_ON, bank, c2); | |
337 | set_code(tca, TCA6507_FULL_ON, bank, c1); | |
338 | tca->bank[bank].ontime = result; | |
339 | ||
340 | result = choose_times(tca->bank[bank].offtime, &c1, &c2); | |
341 | dev_dbg(&tca->client->dev, | |
1f431afd N |
342 | "Chose off times %d(%d) %d(%d) for %dms\n", |
343 | c1, time_codes[c1], | |
a6d511e5 N |
344 | c2, time_codes[c2], tca->bank[bank].offtime); |
345 | set_code(tca, TCA6507_FADE_OFF, bank, c2); | |
346 | set_code(tca, TCA6507_FIRST_OFF, bank, c1); | |
347 | set_code(tca, TCA6507_SECOND_OFF, bank, c1); | |
348 | tca->bank[bank].offtime = result; | |
349 | ||
350 | set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE); | |
351 | } | |
352 | ||
353 | /* Write all needed register of tca6507 */ | |
354 | ||
355 | static void tca6507_work(struct work_struct *work) | |
356 | { | |
357 | struct tca6507_chip *tca = container_of(work, struct tca6507_chip, | |
358 | work); | |
359 | struct i2c_client *cl = tca->client; | |
360 | int set; | |
361 | u8 file[TCA6507_REG_CNT]; | |
362 | int r; | |
363 | ||
364 | spin_lock_irq(&tca->lock); | |
365 | set = tca->reg_set; | |
366 | memcpy(file, tca->reg_file, TCA6507_REG_CNT); | |
367 | tca->reg_set = 0; | |
368 | spin_unlock_irq(&tca->lock); | |
369 | ||
370 | for (r = 0; r < TCA6507_REG_CNT; r++) | |
371 | if (set & (1<<r)) | |
372 | i2c_smbus_write_byte_data(cl, r, file[r]); | |
373 | } | |
374 | ||
375 | static void led_release(struct tca6507_led *led) | |
376 | { | |
377 | /* If led owns any resource, release it. */ | |
378 | struct tca6507_chip *tca = led->chip; | |
379 | if (led->bank >= 0) { | |
380 | struct bank *b = tca->bank + led->bank; | |
381 | if (led->blink) | |
382 | b->time_use--; | |
383 | b->level_use--; | |
384 | } | |
385 | led->blink = 0; | |
386 | led->bank = -1; | |
387 | } | |
388 | ||
389 | static int led_prepare(struct tca6507_led *led) | |
390 | { | |
1f431afd N |
391 | /* Assign this led to a bank, configuring that bank if |
392 | * necessary. */ | |
a6d511e5 N |
393 | int level = TO_LEVEL(led->led_cdev.brightness); |
394 | struct tca6507_chip *tca = led->chip; | |
395 | int c1, c2; | |
396 | int i; | |
397 | struct bank *b; | |
398 | int need_init = 0; | |
399 | ||
400 | led->led_cdev.brightness = TO_BRIGHT(level); | |
401 | if (level == 0) { | |
402 | set_select(tca, led->num, TCA6507_LS_LED_OFF); | |
403 | return 0; | |
404 | } | |
405 | ||
406 | if (led->ontime == 0 || led->offtime == 0) { | |
407 | /* | |
1f431afd N |
408 | * Just set the brightness, choosing first usable |
409 | * bank. If none perfect, choose best. Count | |
410 | * backwards so we check MASTER bank first to avoid | |
411 | * wasting a timer. | |
a6d511e5 N |
412 | */ |
413 | int best = -1;/* full-on */ | |
414 | int diff = 15-level; | |
415 | ||
416 | if (level == 15) { | |
417 | set_select(tca, led->num, TCA6507_LS_LED_ON); | |
418 | return 0; | |
419 | } | |
420 | ||
421 | for (i = MASTER; i >= BANK0; i--) { | |
422 | int d; | |
423 | if (tca->bank[i].level == level || | |
424 | tca->bank[i].level_use == 0) { | |
425 | best = i; | |
426 | break; | |
427 | } | |
428 | d = abs(level - tca->bank[i].level); | |
429 | if (d < diff) { | |
430 | diff = d; | |
431 | best = i; | |
432 | } | |
433 | } | |
434 | if (best == -1) { | |
435 | /* Best brightness is full-on */ | |
436 | set_select(tca, led->num, TCA6507_LS_LED_ON); | |
437 | led->led_cdev.brightness = LED_FULL; | |
438 | return 0; | |
439 | } | |
440 | ||
441 | if (!tca->bank[best].level_use) | |
442 | set_level(tca, best, level); | |
443 | ||
444 | tca->bank[best].level_use++; | |
445 | led->bank = best; | |
446 | set_select(tca, led->num, bank_source[best]); | |
447 | led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level); | |
448 | return 0; | |
449 | } | |
450 | ||
451 | /* | |
1f431afd N |
452 | * We have on/off time so we need to try to allocate a timing |
453 | * bank. First check if times are compatible with hardware | |
454 | * and give up if not. | |
a6d511e5 N |
455 | */ |
456 | if (choose_times(led->ontime, &c1, &c2) < 0) | |
457 | return -EINVAL; | |
458 | if (choose_times(led->offtime, &c1, &c2) < 0) | |
459 | return -EINVAL; | |
460 | ||
461 | for (i = BANK0; i <= BANK1; i++) { | |
462 | if (tca->bank[i].level_use == 0) | |
463 | /* not in use - it is ours! */ | |
464 | break; | |
465 | if (tca->bank[i].level != level) | |
466 | /* Incompatible level - skip */ | |
467 | /* FIX: if timer matches we maybe should consider | |
468 | * this anyway... | |
469 | */ | |
470 | continue; | |
471 | ||
472 | if (tca->bank[i].time_use == 0) | |
473 | /* Timer not in use, and level matches - use it */ | |
474 | break; | |
475 | ||
476 | if (!(tca->bank[i].on_dflt || | |
477 | led->on_dflt || | |
478 | tca->bank[i].ontime == led->ontime)) | |
479 | /* on time is incompatible */ | |
480 | continue; | |
481 | ||
482 | if (!(tca->bank[i].off_dflt || | |
483 | led->off_dflt || | |
484 | tca->bank[i].offtime == led->offtime)) | |
485 | /* off time is incompatible */ | |
486 | continue; | |
487 | ||
488 | /* looks like a suitable match */ | |
489 | break; | |
490 | } | |
491 | ||
492 | if (i > BANK1) | |
493 | /* Nothing matches - how sad */ | |
494 | return -EINVAL; | |
495 | ||
496 | b = &tca->bank[i]; | |
497 | if (b->level_use == 0) | |
498 | set_level(tca, i, level); | |
499 | b->level_use++; | |
500 | led->bank = i; | |
501 | ||
502 | if (b->on_dflt || | |
503 | !led->on_dflt || | |
504 | b->time_use == 0) { | |
505 | b->ontime = led->ontime; | |
506 | b->on_dflt = led->on_dflt; | |
507 | need_init = 1; | |
508 | } | |
509 | ||
510 | if (b->off_dflt || | |
511 | !led->off_dflt || | |
512 | b->time_use == 0) { | |
513 | b->offtime = led->offtime; | |
514 | b->off_dflt = led->off_dflt; | |
515 | need_init = 1; | |
516 | } | |
517 | ||
518 | if (need_init) | |
519 | set_times(tca, i); | |
520 | ||
521 | led->ontime = b->ontime; | |
522 | led->offtime = b->offtime; | |
523 | ||
524 | b->time_use++; | |
525 | led->blink = 1; | |
526 | led->led_cdev.brightness = TO_BRIGHT(b->level); | |
527 | set_select(tca, led->num, blink_source[i]); | |
528 | return 0; | |
529 | } | |
530 | ||
531 | static int led_assign(struct tca6507_led *led) | |
532 | { | |
533 | struct tca6507_chip *tca = led->chip; | |
534 | int err; | |
535 | unsigned long flags; | |
536 | ||
537 | spin_lock_irqsave(&tca->lock, flags); | |
538 | led_release(led); | |
539 | err = led_prepare(led); | |
540 | if (err) { | |
541 | /* | |
1f431afd N |
542 | * Can only fail on timer setup. In that case we need |
543 | * to re-establish as steady level. | |
a6d511e5 N |
544 | */ |
545 | led->ontime = 0; | |
546 | led->offtime = 0; | |
547 | led_prepare(led); | |
548 | } | |
549 | spin_unlock_irqrestore(&tca->lock, flags); | |
550 | ||
551 | if (tca->reg_set) | |
552 | schedule_work(&tca->work); | |
553 | return err; | |
554 | } | |
555 | ||
556 | static void tca6507_brightness_set(struct led_classdev *led_cdev, | |
557 | enum led_brightness brightness) | |
558 | { | |
559 | struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, | |
560 | led_cdev); | |
561 | led->led_cdev.brightness = brightness; | |
562 | led->ontime = 0; | |
563 | led->offtime = 0; | |
564 | led_assign(led); | |
565 | } | |
566 | ||
567 | static int tca6507_blink_set(struct led_classdev *led_cdev, | |
568 | unsigned long *delay_on, | |
569 | unsigned long *delay_off) | |
570 | { | |
571 | struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, | |
572 | led_cdev); | |
573 | ||
574 | if (*delay_on == 0) | |
575 | led->on_dflt = 1; | |
576 | else if (delay_on != &led_cdev->blink_delay_on) | |
577 | led->on_dflt = 0; | |
578 | led->ontime = *delay_on; | |
579 | ||
580 | if (*delay_off == 0) | |
581 | led->off_dflt = 1; | |
582 | else if (delay_off != &led_cdev->blink_delay_off) | |
583 | led->off_dflt = 0; | |
584 | led->offtime = *delay_off; | |
585 | ||
586 | if (led->ontime == 0) | |
587 | led->ontime = 512; | |
588 | if (led->offtime == 0) | |
589 | led->offtime = 512; | |
590 | ||
591 | if (led->led_cdev.brightness == LED_OFF) | |
592 | led->led_cdev.brightness = LED_FULL; | |
593 | if (led_assign(led) < 0) { | |
594 | led->ontime = 0; | |
595 | led->offtime = 0; | |
596 | led->led_cdev.brightness = LED_OFF; | |
597 | return -EINVAL; | |
598 | } | |
599 | *delay_on = led->ontime; | |
600 | *delay_off = led->offtime; | |
601 | return 0; | |
602 | } | |
603 | ||
604 | #ifdef CONFIG_GPIOLIB | |
605 | static void tca6507_gpio_set_value(struct gpio_chip *gc, | |
606 | unsigned offset, int val) | |
607 | { | |
2a664343 | 608 | struct tca6507_chip *tca = gpiochip_get_data(gc); |
a6d511e5 N |
609 | unsigned long flags; |
610 | ||
611 | spin_lock_irqsave(&tca->lock, flags); | |
612 | /* | |
1f431afd N |
613 | * 'OFF' is floating high, and 'ON' is pulled down, so it has |
614 | * the inverse sense of 'val'. | |
a6d511e5 N |
615 | */ |
616 | set_select(tca, tca->gpio_map[offset], | |
617 | val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON); | |
618 | spin_unlock_irqrestore(&tca->lock, flags); | |
619 | if (tca->reg_set) | |
620 | schedule_work(&tca->work); | |
621 | } | |
622 | ||
623 | static int tca6507_gpio_direction_output(struct gpio_chip *gc, | |
624 | unsigned offset, int val) | |
625 | { | |
626 | tca6507_gpio_set_value(gc, offset, val); | |
627 | return 0; | |
628 | } | |
629 | ||
630 | static int tca6507_probe_gpios(struct i2c_client *client, | |
631 | struct tca6507_chip *tca, | |
632 | struct tca6507_platform_data *pdata) | |
633 | { | |
634 | int err; | |
635 | int i = 0; | |
636 | int gpios = 0; | |
637 | ||
638 | for (i = 0; i < NUM_LEDS; i++) | |
639 | if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) { | |
640 | /* Configure as a gpio */ | |
641 | tca->gpio_name[gpios] = pdata->leds.leds[i].name; | |
642 | tca->gpio_map[gpios] = i; | |
643 | gpios++; | |
644 | } | |
645 | ||
646 | if (!gpios) | |
647 | return 0; | |
648 | ||
649 | tca->gpio.label = "gpio-tca6507"; | |
650 | tca->gpio.names = tca->gpio_name; | |
651 | tca->gpio.ngpio = gpios; | |
652 | tca->gpio.base = pdata->gpio_base; | |
653 | tca->gpio.owner = THIS_MODULE; | |
654 | tca->gpio.direction_output = tca6507_gpio_direction_output; | |
655 | tca->gpio.set = tca6507_gpio_set_value; | |
58383c78 | 656 | tca->gpio.parent = &client->dev; |
10ead6e5 N |
657 | #ifdef CONFIG_OF_GPIO |
658 | tca->gpio.of_node = of_node_get(client->dev.of_node); | |
659 | #endif | |
2a664343 | 660 | err = gpiochip_add_data(&tca->gpio, tca); |
a6d511e5 N |
661 | if (err) { |
662 | tca->gpio.ngpio = 0; | |
663 | return err; | |
664 | } | |
665 | if (pdata->setup) | |
666 | pdata->setup(tca->gpio.base, tca->gpio.ngpio); | |
667 | return 0; | |
668 | } | |
669 | ||
670 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
671 | { | |
88d5e520 | 672 | if (tca->gpio.ngpio) |
673 | gpiochip_remove(&tca->gpio); | |
a6d511e5 N |
674 | } |
675 | #else /* CONFIG_GPIOLIB */ | |
676 | static int tca6507_probe_gpios(struct i2c_client *client, | |
677 | struct tca6507_chip *tca, | |
678 | struct tca6507_platform_data *pdata) | |
679 | { | |
680 | return 0; | |
681 | } | |
682 | static void tca6507_remove_gpio(struct tca6507_chip *tca) | |
683 | { | |
684 | } | |
685 | #endif /* CONFIG_GPIOLIB */ | |
686 | ||
0c596a7e MB |
687 | #ifdef CONFIG_OF |
688 | static struct tca6507_platform_data * | |
689 | tca6507_led_dt_init(struct i2c_client *client) | |
690 | { | |
691 | struct device_node *np = client->dev.of_node, *child; | |
692 | struct tca6507_platform_data *pdata; | |
693 | struct led_info *tca_leds; | |
ef754e88 | 694 | int count; |
0c596a7e | 695 | |
ef754e88 AL |
696 | count = of_get_child_count(np); |
697 | if (!count || count > NUM_LEDS) | |
0c596a7e MB |
698 | return ERR_PTR(-ENODEV); |
699 | ||
700 | tca_leds = devm_kzalloc(&client->dev, | |
9334129e | 701 | sizeof(struct led_info) * NUM_LEDS, GFP_KERNEL); |
0c596a7e MB |
702 | if (!tca_leds) |
703 | return ERR_PTR(-ENOMEM); | |
704 | ||
705 | for_each_child_of_node(np, child) { | |
706 | struct led_info led; | |
707 | u32 reg; | |
708 | int ret; | |
709 | ||
710 | led.name = | |
711 | of_get_property(child, "label", NULL) ? : child->name; | |
712 | led.default_trigger = | |
713 | of_get_property(child, "linux,default-trigger", NULL); | |
9334129e | 714 | led.flags = 0; |
10ead6e5 N |
715 | if (of_property_match_string(child, "compatible", "gpio") >= 0) |
716 | led.flags |= TCA6507_MAKE_GPIO; | |
0c596a7e | 717 | ret = of_property_read_u32(child, "reg", ®); |
9334129e | 718 | if (ret != 0 || reg < 0 || reg >= NUM_LEDS) |
0c596a7e MB |
719 | continue; |
720 | ||
721 | tca_leds[reg] = led; | |
722 | } | |
723 | pdata = devm_kzalloc(&client->dev, | |
724 | sizeof(struct tca6507_platform_data), GFP_KERNEL); | |
725 | if (!pdata) | |
726 | return ERR_PTR(-ENOMEM); | |
727 | ||
728 | pdata->leds.leds = tca_leds; | |
9334129e | 729 | pdata->leds.num_leds = NUM_LEDS; |
33ca1532 | 730 | #ifdef CONFIG_GPIOLIB |
10ead6e5 | 731 | pdata->gpio_base = -1; |
33ca1532 | 732 | #endif |
0c596a7e MB |
733 | return pdata; |
734 | } | |
735 | ||
736 | static const struct of_device_id of_tca6507_leds_match[] = { | |
737 | { .compatible = "ti,tca6507", }, | |
738 | {}, | |
739 | }; | |
4d59ed85 | 740 | MODULE_DEVICE_TABLE(of, of_tca6507_leds_match); |
0c596a7e MB |
741 | |
742 | #else | |
743 | static struct tca6507_platform_data * | |
744 | tca6507_led_dt_init(struct i2c_client *client) | |
745 | { | |
746 | return ERR_PTR(-ENODEV); | |
747 | } | |
748 | ||
0c596a7e MB |
749 | #endif |
750 | ||
98ea1ea2 | 751 | static int tca6507_probe(struct i2c_client *client, |
0c596a7e | 752 | const struct i2c_device_id *id) |
a6d511e5 N |
753 | { |
754 | struct tca6507_chip *tca; | |
755 | struct i2c_adapter *adapter; | |
756 | struct tca6507_platform_data *pdata; | |
757 | int err; | |
758 | int i = 0; | |
759 | ||
760 | adapter = to_i2c_adapter(client->dev.parent); | |
87aae1ea | 761 | pdata = dev_get_platdata(&client->dev); |
a6d511e5 N |
762 | |
763 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) | |
764 | return -EIO; | |
765 | ||
766 | if (!pdata || pdata->leds.num_leds != NUM_LEDS) { | |
0c596a7e MB |
767 | pdata = tca6507_led_dt_init(client); |
768 | if (IS_ERR(pdata)) { | |
769 | dev_err(&client->dev, "Need %d entries in platform-data list\n", | |
770 | NUM_LEDS); | |
771 | return PTR_ERR(pdata); | |
772 | } | |
a6d511e5 | 773 | } |
6770fc60 | 774 | tca = devm_kzalloc(&client->dev, sizeof(*tca), GFP_KERNEL); |
a6d511e5 | 775 | if (!tca) |
920c4f4c | 776 | return -ENOMEM; |
a6d511e5 N |
777 | |
778 | tca->client = client; | |
779 | INIT_WORK(&tca->work, tca6507_work); | |
780 | spin_lock_init(&tca->lock); | |
781 | i2c_set_clientdata(client, tca); | |
782 | ||
783 | for (i = 0; i < NUM_LEDS; i++) { | |
784 | struct tca6507_led *l = tca->leds + i; | |
785 | ||
786 | l->chip = tca; | |
787 | l->num = i; | |
788 | if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) { | |
789 | l->led_cdev.name = pdata->leds.leds[i].name; | |
790 | l->led_cdev.default_trigger | |
791 | = pdata->leds.leds[i].default_trigger; | |
792 | l->led_cdev.brightness_set = tca6507_brightness_set; | |
793 | l->led_cdev.blink_set = tca6507_blink_set; | |
794 | l->bank = -1; | |
795 | err = led_classdev_register(&client->dev, | |
796 | &l->led_cdev); | |
797 | if (err < 0) | |
798 | goto exit; | |
799 | } | |
800 | } | |
801 | err = tca6507_probe_gpios(client, tca, pdata); | |
802 | if (err) | |
803 | goto exit; | |
804 | /* set all registers to known state - zero */ | |
805 | tca->reg_set = 0x7f; | |
806 | schedule_work(&tca->work); | |
807 | ||
808 | return 0; | |
809 | exit: | |
920c4f4c | 810 | while (i--) { |
a6d511e5 N |
811 | if (tca->leds[i].led_cdev.name) |
812 | led_classdev_unregister(&tca->leds[i].led_cdev); | |
920c4f4c | 813 | } |
a6d511e5 N |
814 | return err; |
815 | } | |
816 | ||
678e8a6b | 817 | static int tca6507_remove(struct i2c_client *client) |
a6d511e5 N |
818 | { |
819 | int i; | |
820 | struct tca6507_chip *tca = i2c_get_clientdata(client); | |
821 | struct tca6507_led *tca_leds = tca->leds; | |
822 | ||
823 | for (i = 0; i < NUM_LEDS; i++) { | |
824 | if (tca_leds[i].led_cdev.name) | |
825 | led_classdev_unregister(&tca_leds[i].led_cdev); | |
826 | } | |
827 | tca6507_remove_gpio(tca); | |
828 | cancel_work_sync(&tca->work); | |
a6d511e5 N |
829 | |
830 | return 0; | |
831 | } | |
832 | ||
833 | static struct i2c_driver tca6507_driver = { | |
834 | .driver = { | |
835 | .name = "leds-tca6507", | |
fbd9df28 | 836 | .of_match_table = of_match_ptr(of_tca6507_leds_match), |
a6d511e5 N |
837 | }, |
838 | .probe = tca6507_probe, | |
df07cf81 | 839 | .remove = tca6507_remove, |
a6d511e5 N |
840 | .id_table = tca6507_id, |
841 | }; | |
842 | ||
2e911767 | 843 | module_i2c_driver(tca6507_driver); |
a6d511e5 N |
844 | |
845 | MODULE_AUTHOR("NeilBrown <neilb@suse.de>"); | |
846 | MODULE_DESCRIPTION("TCA6507 LED/GPO driver"); | |
847 | MODULE_LICENSE("GPL v2"); |