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 8 * blink or double-blink. 9 * 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. 13 * 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. 18 * 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'. 25 * 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: 28 * 0, 64, 128, 192, 256, 384, 512, 768, 29 * 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320 30 * 31 * Times that cannot be closely matched with these must be handled in 32 * software. This driver allows 12.5% error in matching. 33 * 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. 47 * 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. 53 * 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. 60 * 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. 65 * 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. 71 * 72 * 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. 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> 98 #include <linux/of.h> 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 /* 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). 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 /* 269 * Update the register file with the appropriate 3-bit state for the 270 * given led. 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 } 287 288 /* 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. 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 } 322 323 /* Record all relevant time codes for a given bank */ 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); 330 dev_dbg(&tca->client->dev, 331 "Chose on times %d(%d) %d(%d) for %dms\n", 332 c1, time_codes[c1], 333 c2, time_codes[c2], tca->bank[bank].ontime); 334 set_code(tca, TCA6507_FADE_ON, bank, c2); 335 set_code(tca, TCA6507_FULL_ON, bank, c1); 336 tca->bank[bank].ontime = result; 337 338 result = choose_times(tca->bank[bank].offtime, &c1, &c2); 339 dev_dbg(&tca->client->dev, 340 "Chose off times %d(%d) %d(%d) for %dms\n", 341 c1, time_codes[c1], 342 c2, time_codes[c2], tca->bank[bank].offtime); 343 set_code(tca, TCA6507_FADE_OFF, bank, c2); 344 set_code(tca, TCA6507_FIRST_OFF, bank, c1); 345 set_code(tca, TCA6507_SECOND_OFF, bank, c1); 346 tca->bank[bank].offtime = result; 347 348 set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE); 349 } 350 351 /* Write all needed register of tca6507 */ 352 353 static void tca6507_work(struct work_struct *work) 354 { 355 struct tca6507_chip *tca = container_of(work, struct tca6507_chip, 356 work); 357 struct i2c_client *cl = tca->client; 358 int set; 359 u8 file[TCA6507_REG_CNT]; 360 int r; 361 362 spin_lock_irq(&tca->lock); 363 set = tca->reg_set; 364 memcpy(file, tca->reg_file, TCA6507_REG_CNT); 365 tca->reg_set = 0; 366 spin_unlock_irq(&tca->lock); 367 368 for (r = 0; r < TCA6507_REG_CNT; r++) 369 if (set & (1<<r)) 370 i2c_smbus_write_byte_data(cl, r, file[r]); 371 } 372 373 static void led_release(struct tca6507_led *led) 374 { 375 /* If led owns any resource, release it. */ 376 struct tca6507_chip *tca = led->chip; 377 if (led->bank >= 0) { 378 struct bank *b = tca->bank + led->bank; 379 if (led->blink) 380 b->time_use--; 381 b->level_use--; 382 } 383 led->blink = 0; 384 led->bank = -1; 385 } 386 387 static int led_prepare(struct tca6507_led *led) 388 { 389 /* Assign this led to a bank, configuring that bank if 390 * necessary. */ 391 int level = TO_LEVEL(led->led_cdev.brightness); 392 struct tca6507_chip *tca = led->chip; 393 int c1, c2; 394 int i; 395 struct bank *b; 396 int need_init = 0; 397 398 led->led_cdev.brightness = TO_BRIGHT(level); 399 if (level == 0) { 400 set_select(tca, led->num, TCA6507_LS_LED_OFF); 401 return 0; 402 } 403 404 if (led->ontime == 0 || led->offtime == 0) { 405 /* 406 * Just set the brightness, choosing first usable 407 * bank. If none perfect, choose best. Count 408 * backwards so we check MASTER bank first to avoid 409 * wasting a timer. 410 */ 411 int best = -1;/* full-on */ 412 int diff = 15-level; 413 414 if (level == 15) { 415 set_select(tca, led->num, TCA6507_LS_LED_ON); 416 return 0; 417 } 418 419 for (i = MASTER; i >= BANK0; i--) { 420 int d; 421 if (tca->bank[i].level == level || 422 tca->bank[i].level_use == 0) { 423 best = i; 424 break; 425 } 426 d = abs(level - tca->bank[i].level); 427 if (d < diff) { 428 diff = d; 429 best = i; 430 } 431 } 432 if (best == -1) { 433 /* Best brightness is full-on */ 434 set_select(tca, led->num, TCA6507_LS_LED_ON); 435 led->led_cdev.brightness = LED_FULL; 436 return 0; 437 } 438 439 if (!tca->bank[best].level_use) 440 set_level(tca, best, level); 441 442 tca->bank[best].level_use++; 443 led->bank = best; 444 set_select(tca, led->num, bank_source[best]); 445 led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level); 446 return 0; 447 } 448 449 /* 450 * We have on/off time so we need to try to allocate a timing 451 * bank. First check if times are compatible with hardware 452 * and give up if not. 453 */ 454 if (choose_times(led->ontime, &c1, &c2) < 0) 455 return -EINVAL; 456 if (choose_times(led->offtime, &c1, &c2) < 0) 457 return -EINVAL; 458 459 for (i = BANK0; i <= BANK1; i++) { 460 if (tca->bank[i].level_use == 0) 461 /* not in use - it is ours! */ 462 break; 463 if (tca->bank[i].level != level) 464 /* Incompatible level - skip */ 465 /* FIX: if timer matches we maybe should consider 466 * this anyway... 467 */ 468 continue; 469 470 if (tca->bank[i].time_use == 0) 471 /* Timer not in use, and level matches - use it */ 472 break; 473 474 if (!(tca->bank[i].on_dflt || 475 led->on_dflt || 476 tca->bank[i].ontime == led->ontime)) 477 /* on time is incompatible */ 478 continue; 479 480 if (!(tca->bank[i].off_dflt || 481 led->off_dflt || 482 tca->bank[i].offtime == led->offtime)) 483 /* off time is incompatible */ 484 continue; 485 486 /* looks like a suitable match */ 487 break; 488 } 489 490 if (i > BANK1) 491 /* Nothing matches - how sad */ 492 return -EINVAL; 493 494 b = &tca->bank[i]; 495 if (b->level_use == 0) 496 set_level(tca, i, level); 497 b->level_use++; 498 led->bank = i; 499 500 if (b->on_dflt || 501 !led->on_dflt || 502 b->time_use == 0) { 503 b->ontime = led->ontime; 504 b->on_dflt = led->on_dflt; 505 need_init = 1; 506 } 507 508 if (b->off_dflt || 509 !led->off_dflt || 510 b->time_use == 0) { 511 b->offtime = led->offtime; 512 b->off_dflt = led->off_dflt; 513 need_init = 1; 514 } 515 516 if (need_init) 517 set_times(tca, i); 518 519 led->ontime = b->ontime; 520 led->offtime = b->offtime; 521 522 b->time_use++; 523 led->blink = 1; 524 led->led_cdev.brightness = TO_BRIGHT(b->level); 525 set_select(tca, led->num, blink_source[i]); 526 return 0; 527 } 528 529 static int led_assign(struct tca6507_led *led) 530 { 531 struct tca6507_chip *tca = led->chip; 532 int err; 533 unsigned long flags; 534 535 spin_lock_irqsave(&tca->lock, flags); 536 led_release(led); 537 err = led_prepare(led); 538 if (err) { 539 /* 540 * Can only fail on timer setup. In that case we need 541 * to re-establish as steady level. 542 */ 543 led->ontime = 0; 544 led->offtime = 0; 545 led_prepare(led); 546 } 547 spin_unlock_irqrestore(&tca->lock, flags); 548 549 if (tca->reg_set) 550 schedule_work(&tca->work); 551 return err; 552 } 553 554 static void tca6507_brightness_set(struct led_classdev *led_cdev, 555 enum led_brightness brightness) 556 { 557 struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, 558 led_cdev); 559 led->led_cdev.brightness = brightness; 560 led->ontime = 0; 561 led->offtime = 0; 562 led_assign(led); 563 } 564 565 static int tca6507_blink_set(struct led_classdev *led_cdev, 566 unsigned long *delay_on, 567 unsigned long *delay_off) 568 { 569 struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, 570 led_cdev); 571 572 if (*delay_on == 0) 573 led->on_dflt = 1; 574 else if (delay_on != &led_cdev->blink_delay_on) 575 led->on_dflt = 0; 576 led->ontime = *delay_on; 577 578 if (*delay_off == 0) 579 led->off_dflt = 1; 580 else if (delay_off != &led_cdev->blink_delay_off) 581 led->off_dflt = 0; 582 led->offtime = *delay_off; 583 584 if (led->ontime == 0) 585 led->ontime = 512; 586 if (led->offtime == 0) 587 led->offtime = 512; 588 589 if (led->led_cdev.brightness == LED_OFF) 590 led->led_cdev.brightness = LED_FULL; 591 if (led_assign(led) < 0) { 592 led->ontime = 0; 593 led->offtime = 0; 594 led->led_cdev.brightness = LED_OFF; 595 return -EINVAL; 596 } 597 *delay_on = led->ontime; 598 *delay_off = led->offtime; 599 return 0; 600 } 601 602 #ifdef CONFIG_GPIOLIB 603 static void tca6507_gpio_set_value(struct gpio_chip *gc, 604 unsigned offset, int val) 605 { 606 struct tca6507_chip *tca = container_of(gc, struct tca6507_chip, gpio); 607 unsigned long flags; 608 609 spin_lock_irqsave(&tca->lock, flags); 610 /* 611 * 'OFF' is floating high, and 'ON' is pulled down, so it has 612 * the inverse sense of 'val'. 613 */ 614 set_select(tca, tca->gpio_map[offset], 615 val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON); 616 spin_unlock_irqrestore(&tca->lock, flags); 617 if (tca->reg_set) 618 schedule_work(&tca->work); 619 } 620 621 static int tca6507_gpio_direction_output(struct gpio_chip *gc, 622 unsigned offset, int val) 623 { 624 tca6507_gpio_set_value(gc, offset, val); 625 return 0; 626 } 627 628 static int tca6507_probe_gpios(struct i2c_client *client, 629 struct tca6507_chip *tca, 630 struct tca6507_platform_data *pdata) 631 { 632 int err; 633 int i = 0; 634 int gpios = 0; 635 636 for (i = 0; i < NUM_LEDS; i++) 637 if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) { 638 /* Configure as a gpio */ 639 tca->gpio_name[gpios] = pdata->leds.leds[i].name; 640 tca->gpio_map[gpios] = i; 641 gpios++; 642 } 643 644 if (!gpios) 645 return 0; 646 647 tca->gpio.label = "gpio-tca6507"; 648 tca->gpio.names = tca->gpio_name; 649 tca->gpio.ngpio = gpios; 650 tca->gpio.base = pdata->gpio_base; 651 tca->gpio.owner = THIS_MODULE; 652 tca->gpio.direction_output = tca6507_gpio_direction_output; 653 tca->gpio.set = tca6507_gpio_set_value; 654 tca->gpio.dev = &client->dev; 655 #ifdef CONFIG_OF_GPIO 656 tca->gpio.of_node = of_node_get(client->dev.of_node); 657 #endif 658 err = gpiochip_add(&tca->gpio); 659 if (err) { 660 tca->gpio.ngpio = 0; 661 return err; 662 } 663 if (pdata->setup) 664 pdata->setup(tca->gpio.base, tca->gpio.ngpio); 665 return 0; 666 } 667 668 static void tca6507_remove_gpio(struct tca6507_chip *tca) 669 { 670 if (tca->gpio.ngpio) 671 gpiochip_remove(&tca->gpio); 672 } 673 #else /* CONFIG_GPIOLIB */ 674 static int tca6507_probe_gpios(struct i2c_client *client, 675 struct tca6507_chip *tca, 676 struct tca6507_platform_data *pdata) 677 { 678 return 0; 679 } 680 static void tca6507_remove_gpio(struct tca6507_chip *tca) 681 { 682 } 683 #endif /* CONFIG_GPIOLIB */ 684 685 #ifdef CONFIG_OF 686 static struct tca6507_platform_data * 687 tca6507_led_dt_init(struct i2c_client *client) 688 { 689 struct device_node *np = client->dev.of_node, *child; 690 struct tca6507_platform_data *pdata; 691 struct led_info *tca_leds; 692 int count; 693 694 count = of_get_child_count(np); 695 if (!count || count > NUM_LEDS) 696 return ERR_PTR(-ENODEV); 697 698 tca_leds = devm_kzalloc(&client->dev, 699 sizeof(struct led_info) * NUM_LEDS, GFP_KERNEL); 700 if (!tca_leds) 701 return ERR_PTR(-ENOMEM); 702 703 for_each_child_of_node(np, child) { 704 struct led_info led; 705 u32 reg; 706 int ret; 707 708 led.name = 709 of_get_property(child, "label", NULL) ? : child->name; 710 led.default_trigger = 711 of_get_property(child, "linux,default-trigger", NULL); 712 led.flags = 0; 713 if (of_property_match_string(child, "compatible", "gpio") >= 0) 714 led.flags |= TCA6507_MAKE_GPIO; 715 ret = of_property_read_u32(child, "reg", ®); 716 if (ret != 0 || reg < 0 || reg >= NUM_LEDS) 717 continue; 718 719 tca_leds[reg] = led; 720 } 721 pdata = devm_kzalloc(&client->dev, 722 sizeof(struct tca6507_platform_data), GFP_KERNEL); 723 if (!pdata) 724 return ERR_PTR(-ENOMEM); 725 726 pdata->leds.leds = tca_leds; 727 pdata->leds.num_leds = NUM_LEDS; 728 #ifdef CONFIG_GPIOLIB 729 pdata->gpio_base = -1; 730 #endif 731 return pdata; 732 } 733 734 static const struct of_device_id of_tca6507_leds_match[] = { 735 { .compatible = "ti,tca6507", }, 736 {}, 737 }; 738 MODULE_DEVICE_TABLE(of, of_tca6507_leds_match); 739 740 #else 741 static struct tca6507_platform_data * 742 tca6507_led_dt_init(struct i2c_client *client) 743 { 744 return ERR_PTR(-ENODEV); 745 } 746 747 #endif 748 749 static int tca6507_probe(struct i2c_client *client, 750 const struct i2c_device_id *id) 751 { 752 struct tca6507_chip *tca; 753 struct i2c_adapter *adapter; 754 struct tca6507_platform_data *pdata; 755 int err; 756 int i = 0; 757 758 adapter = to_i2c_adapter(client->dev.parent); 759 pdata = dev_get_platdata(&client->dev); 760 761 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) 762 return -EIO; 763 764 if (!pdata || pdata->leds.num_leds != NUM_LEDS) { 765 pdata = tca6507_led_dt_init(client); 766 if (IS_ERR(pdata)) { 767 dev_err(&client->dev, "Need %d entries in platform-data list\n", 768 NUM_LEDS); 769 return PTR_ERR(pdata); 770 } 771 } 772 tca = devm_kzalloc(&client->dev, sizeof(*tca), GFP_KERNEL); 773 if (!tca) 774 return -ENOMEM; 775 776 tca->client = client; 777 INIT_WORK(&tca->work, tca6507_work); 778 spin_lock_init(&tca->lock); 779 i2c_set_clientdata(client, tca); 780 781 for (i = 0; i < NUM_LEDS; i++) { 782 struct tca6507_led *l = tca->leds + i; 783 784 l->chip = tca; 785 l->num = i; 786 if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) { 787 l->led_cdev.name = pdata->leds.leds[i].name; 788 l->led_cdev.default_trigger 789 = pdata->leds.leds[i].default_trigger; 790 l->led_cdev.brightness_set = tca6507_brightness_set; 791 l->led_cdev.blink_set = tca6507_blink_set; 792 l->bank = -1; 793 err = led_classdev_register(&client->dev, 794 &l->led_cdev); 795 if (err < 0) 796 goto exit; 797 } 798 } 799 err = tca6507_probe_gpios(client, tca, pdata); 800 if (err) 801 goto exit; 802 /* set all registers to known state - zero */ 803 tca->reg_set = 0x7f; 804 schedule_work(&tca->work); 805 806 return 0; 807 exit: 808 while (i--) { 809 if (tca->leds[i].led_cdev.name) 810 led_classdev_unregister(&tca->leds[i].led_cdev); 811 } 812 return err; 813 } 814 815 static int tca6507_remove(struct i2c_client *client) 816 { 817 int i; 818 struct tca6507_chip *tca = i2c_get_clientdata(client); 819 struct tca6507_led *tca_leds = tca->leds; 820 821 for (i = 0; i < NUM_LEDS; i++) { 822 if (tca_leds[i].led_cdev.name) 823 led_classdev_unregister(&tca_leds[i].led_cdev); 824 } 825 tca6507_remove_gpio(tca); 826 cancel_work_sync(&tca->work); 827 828 return 0; 829 } 830 831 static struct i2c_driver tca6507_driver = { 832 .driver = { 833 .name = "leds-tca6507", 834 .of_match_table = of_match_ptr(of_tca6507_leds_match), 835 }, 836 .probe = tca6507_probe, 837 .remove = tca6507_remove, 838 .id_table = tca6507_id, 839 }; 840 841 module_i2c_driver(tca6507_driver); 842 843 MODULE_AUTHOR("NeilBrown <neilb@suse.de>"); 844 MODULE_DESCRIPTION("TCA6507 LED/GPO driver"); 845 MODULE_LICENSE("GPL v2"); 846