1 // SPDX-License-Identifier: GPL-2.0-only 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. 8 * The modulation can be varied in a simple pattern to produce a 9 * blink or double-blink. 10 * 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. 14 * 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. 19 * 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'. 26 * 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: 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 handled in 33 * software. This driver allows 12.5% error in matching. 34 * 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. 48 * 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. 54 * 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. 61 * 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. 66 * 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. 72 */ 73 74 #include <linux/module.h> 75 #include <linux/slab.h> 76 #include <linux/leds.h> 77 #include <linux/err.h> 78 #include <linux/i2c.h> 79 #include <linux/gpio/driver.h> 80 #include <linux/property.h> 81 #include <linux/workqueue.h> 82 83 /* LED select registers determine the source that drives LED outputs */ 84 #define TCA6507_LS_LED_OFF 0x0 /* Output HI-Z (off) */ 85 #define TCA6507_LS_LED_OFF1 0x1 /* Output HI-Z (off) - not used */ 86 #define TCA6507_LS_LED_PWM0 0x2 /* Output LOW with Bank0 rate */ 87 #define TCA6507_LS_LED_PWM1 0x3 /* Output LOW with Bank1 rate */ 88 #define TCA6507_LS_LED_ON 0x4 /* Output LOW (on) */ 89 #define TCA6507_LS_LED_MIR 0x5 /* Output LOW with Master Intensity */ 90 #define TCA6507_LS_BLINK0 0x6 /* Blink at Bank0 rate */ 91 #define TCA6507_LS_BLINK1 0x7 /* Blink at Bank1 rate */ 92 93 struct tca6507_platform_data { 94 struct led_platform_data leds; 95 #ifdef CONFIG_GPIOLIB 96 int gpio_base; 97 #endif 98 }; 99 100 #define TCA6507_MAKE_GPIO 1 101 102 enum { 103 BANK0, 104 BANK1, 105 MASTER, 106 }; 107 static int bank_source[3] = { 108 TCA6507_LS_LED_PWM0, 109 TCA6507_LS_LED_PWM1, 110 TCA6507_LS_LED_MIR, 111 }; 112 static int blink_source[2] = { 113 TCA6507_LS_BLINK0, 114 TCA6507_LS_BLINK1, 115 }; 116 117 /* PWM registers */ 118 #define TCA6507_REG_CNT 11 119 120 /* 121 * 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output 122 * owns one bit in each register 123 */ 124 #define TCA6507_FADE_ON 0x03 125 #define TCA6507_FULL_ON 0x04 126 #define TCA6507_FADE_OFF 0x05 127 #define TCA6507_FIRST_OFF 0x06 128 #define TCA6507_SECOND_OFF 0x07 129 #define TCA6507_MAX_INTENSITY 0x08 130 #define TCA6507_MASTER_INTENSITY 0x09 131 #define TCA6507_INITIALIZE 0x0A 132 133 #define INIT_CODE 0x8 134 135 #define TIMECODES 16 136 static int time_codes[TIMECODES] = { 137 0, 64, 128, 192, 256, 384, 512, 768, 138 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320 139 }; 140 141 /* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */ 142 static inline int TO_LEVEL(int brightness) 143 { 144 return brightness >> 4; 145 } 146 147 /* ...and convert back */ 148 static inline int TO_BRIGHT(int level) 149 { 150 if (level) 151 return (level << 4) | 0xf; 152 return 0; 153 } 154 155 #define NUM_LEDS 7 156 struct tca6507_chip { 157 int reg_set; /* One bit per register where 158 * a '1' means the register 159 * should be written */ 160 u8 reg_file[TCA6507_REG_CNT]; 161 /* Bank 2 is Master Intensity and doesn't use times */ 162 struct bank { 163 int level; 164 int ontime, offtime; 165 int on_dflt, off_dflt; 166 int time_use, level_use; 167 } bank[3]; 168 struct i2c_client *client; 169 struct work_struct work; 170 spinlock_t lock; 171 172 struct tca6507_led { 173 struct tca6507_chip *chip; 174 struct led_classdev led_cdev; 175 int num; 176 int ontime, offtime; 177 int on_dflt, off_dflt; 178 int bank; /* Bank used, or -1 */ 179 int blink; /* Set if hardware-blinking */ 180 } leds[NUM_LEDS]; 181 #ifdef CONFIG_GPIOLIB 182 struct gpio_chip gpio; 183 int gpio_map[NUM_LEDS]; 184 #endif 185 }; 186 187 static const struct i2c_device_id tca6507_id[] = { 188 { "tca6507" }, 189 { } 190 }; 191 MODULE_DEVICE_TABLE(i2c, tca6507_id); 192 193 static int choose_times(int msec, int *c1p, int *c2p) 194 { 195 /* 196 * Choose two timecodes which add to 'msec' as near as 197 * possible. The first returned is the 'on' or 'off' time. 198 * The second is to be used as a 'fade-on' or 'fade-off' time. 199 * If 'msec' is even, the first will not be smaller than the 200 * second. If 'msec' is odd, the first will not be larger 201 * than the second. 202 * If we cannot get a sum within 1/8 of 'msec' fail with 203 * -EINVAL, otherwise return the sum that was achieved, plus 1 204 * if the first is smaller. 205 * If two possibilities are equally good (e.g. 512+0, 206 * 256+256), choose the first pair so there is more 207 * change-time visible (i.e. it is softer). 208 */ 209 int c1, c2; 210 int tmax = msec * 9 / 8; 211 int tmin = msec * 7 / 8; 212 int diff = 65536; 213 214 /* We start at '1' to ensure we never even think of choosing a 215 * total time of '0'. 216 */ 217 for (c1 = 1; c1 < TIMECODES; c1++) { 218 int t = time_codes[c1]; 219 if (t*2 < tmin) 220 continue; 221 if (t > tmax) 222 break; 223 for (c2 = 0; c2 <= c1; c2++) { 224 int tt = t + time_codes[c2]; 225 int d; 226 if (tt < tmin) 227 continue; 228 if (tt > tmax) 229 break; 230 /* This works! */ 231 d = abs(msec - tt); 232 if (d >= diff) 233 continue; 234 /* Best yet */ 235 *c1p = c1; 236 *c2p = c2; 237 diff = d; 238 if (d == 0) 239 return msec; 240 } 241 } 242 if (diff < 65536) { 243 int actual; 244 if (msec & 1) { 245 swap(*c2p, *c1p); 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 the 259 * 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 one 278 * bank or other. This can be used for timers, for levels, or for 279 * initialization. 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 codes 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 if (result < 0) 320 return; 321 dev_dbg(&tca->client->dev, 322 "Chose on times %d(%d) %d(%d) for %dms\n", 323 c1, time_codes[c1], 324 c2, time_codes[c2], tca->bank[bank].ontime); 325 set_code(tca, TCA6507_FADE_ON, bank, c2); 326 set_code(tca, TCA6507_FULL_ON, bank, c1); 327 tca->bank[bank].ontime = result; 328 329 result = choose_times(tca->bank[bank].offtime, &c1, &c2); 330 dev_dbg(&tca->client->dev, 331 "Chose off times %d(%d) %d(%d) for %dms\n", 332 c1, time_codes[c1], 333 c2, time_codes[c2], tca->bank[bank].offtime); 334 set_code(tca, TCA6507_FADE_OFF, bank, c2); 335 set_code(tca, TCA6507_FIRST_OFF, bank, c1); 336 set_code(tca, TCA6507_SECOND_OFF, bank, c1); 337 tca->bank[bank].offtime = result; 338 339 set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE); 340 } 341 342 /* Write all needed register of tca6507 */ 343 344 static void tca6507_work(struct work_struct *work) 345 { 346 struct tca6507_chip *tca = container_of(work, struct tca6507_chip, 347 work); 348 struct i2c_client *cl = tca->client; 349 int set; 350 u8 file[TCA6507_REG_CNT]; 351 int r; 352 353 spin_lock_irq(&tca->lock); 354 set = tca->reg_set; 355 memcpy(file, tca->reg_file, TCA6507_REG_CNT); 356 tca->reg_set = 0; 357 spin_unlock_irq(&tca->lock); 358 359 for (r = 0; r < TCA6507_REG_CNT; r++) 360 if (set & (1<<r)) 361 i2c_smbus_write_byte_data(cl, r, file[r]); 362 } 363 364 static void led_release(struct tca6507_led *led) 365 { 366 /* If led owns any resource, release it. */ 367 struct tca6507_chip *tca = led->chip; 368 if (led->bank >= 0) { 369 struct bank *b = tca->bank + led->bank; 370 if (led->blink) 371 b->time_use--; 372 b->level_use--; 373 } 374 led->blink = 0; 375 led->bank = -1; 376 } 377 378 static int led_prepare(struct tca6507_led *led) 379 { 380 /* Assign this led to a bank, configuring that bank if 381 * necessary. */ 382 int level = TO_LEVEL(led->led_cdev.brightness); 383 struct tca6507_chip *tca = led->chip; 384 int c1, c2; 385 int i; 386 struct bank *b; 387 int need_init = 0; 388 389 led->led_cdev.brightness = TO_BRIGHT(level); 390 if (level == 0) { 391 set_select(tca, led->num, TCA6507_LS_LED_OFF); 392 return 0; 393 } 394 395 if (led->ontime == 0 || led->offtime == 0) { 396 /* 397 * Just set the brightness, choosing first usable 398 * bank. If none perfect, choose best. Count 399 * backwards so we check MASTER bank first to avoid 400 * wasting a timer. 401 */ 402 int best = -1;/* full-on */ 403 int diff = 15-level; 404 405 if (level == 15) { 406 set_select(tca, led->num, TCA6507_LS_LED_ON); 407 return 0; 408 } 409 410 for (i = MASTER; i >= BANK0; i--) { 411 int d; 412 if (tca->bank[i].level == level || 413 tca->bank[i].level_use == 0) { 414 best = i; 415 break; 416 } 417 d = abs(level - tca->bank[i].level); 418 if (d < diff) { 419 diff = d; 420 best = i; 421 } 422 } 423 if (best == -1) { 424 /* Best brightness is full-on */ 425 set_select(tca, led->num, TCA6507_LS_LED_ON); 426 led->led_cdev.brightness = LED_FULL; 427 return 0; 428 } 429 430 if (!tca->bank[best].level_use) 431 set_level(tca, best, level); 432 433 tca->bank[best].level_use++; 434 led->bank = best; 435 set_select(tca, led->num, bank_source[best]); 436 led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level); 437 return 0; 438 } 439 440 /* 441 * We have on/off time so we need to try to allocate a timing 442 * bank. First check if times are compatible with hardware 443 * and give up if not. 444 */ 445 if (choose_times(led->ontime, &c1, &c2) < 0) 446 return -EINVAL; 447 if (choose_times(led->offtime, &c1, &c2) < 0) 448 return -EINVAL; 449 450 for (i = BANK0; i <= BANK1; i++) { 451 if (tca->bank[i].level_use == 0) 452 /* not in use - it is ours! */ 453 break; 454 if (tca->bank[i].level != level) 455 /* Incompatible level - skip */ 456 /* FIX: if timer matches we maybe should consider 457 * this anyway... 458 */ 459 continue; 460 461 if (tca->bank[i].time_use == 0) 462 /* Timer not in use, and level matches - use it */ 463 break; 464 465 if (!(tca->bank[i].on_dflt || 466 led->on_dflt || 467 tca->bank[i].ontime == led->ontime)) 468 /* on time is incompatible */ 469 continue; 470 471 if (!(tca->bank[i].off_dflt || 472 led->off_dflt || 473 tca->bank[i].offtime == led->offtime)) 474 /* off time is incompatible */ 475 continue; 476 477 /* looks like a suitable match */ 478 break; 479 } 480 481 if (i > BANK1) 482 /* Nothing matches - how sad */ 483 return -EINVAL; 484 485 b = &tca->bank[i]; 486 if (b->level_use == 0) 487 set_level(tca, i, level); 488 b->level_use++; 489 led->bank = i; 490 491 if (b->on_dflt || 492 !led->on_dflt || 493 b->time_use == 0) { 494 b->ontime = led->ontime; 495 b->on_dflt = led->on_dflt; 496 need_init = 1; 497 } 498 499 if (b->off_dflt || 500 !led->off_dflt || 501 b->time_use == 0) { 502 b->offtime = led->offtime; 503 b->off_dflt = led->off_dflt; 504 need_init = 1; 505 } 506 507 if (need_init) 508 set_times(tca, i); 509 510 led->ontime = b->ontime; 511 led->offtime = b->offtime; 512 513 b->time_use++; 514 led->blink = 1; 515 led->led_cdev.brightness = TO_BRIGHT(b->level); 516 set_select(tca, led->num, blink_source[i]); 517 return 0; 518 } 519 520 static int led_assign(struct tca6507_led *led) 521 { 522 struct tca6507_chip *tca = led->chip; 523 int err; 524 unsigned long flags; 525 526 spin_lock_irqsave(&tca->lock, flags); 527 led_release(led); 528 err = led_prepare(led); 529 if (err) { 530 /* 531 * Can only fail on timer setup. In that case we need 532 * to re-establish as steady level. 533 */ 534 led->ontime = 0; 535 led->offtime = 0; 536 led_prepare(led); 537 } 538 spin_unlock_irqrestore(&tca->lock, flags); 539 540 if (tca->reg_set) 541 schedule_work(&tca->work); 542 return err; 543 } 544 545 static void tca6507_brightness_set(struct led_classdev *led_cdev, 546 enum led_brightness brightness) 547 { 548 struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, 549 led_cdev); 550 led->led_cdev.brightness = brightness; 551 led->ontime = 0; 552 led->offtime = 0; 553 led_assign(led); 554 } 555 556 static int tca6507_blink_set(struct led_classdev *led_cdev, 557 unsigned long *delay_on, 558 unsigned long *delay_off) 559 { 560 struct tca6507_led *led = container_of(led_cdev, struct tca6507_led, 561 led_cdev); 562 563 if (*delay_on == 0) 564 led->on_dflt = 1; 565 else if (delay_on != &led_cdev->blink_delay_on) 566 led->on_dflt = 0; 567 led->ontime = *delay_on; 568 569 if (*delay_off == 0) 570 led->off_dflt = 1; 571 else if (delay_off != &led_cdev->blink_delay_off) 572 led->off_dflt = 0; 573 led->offtime = *delay_off; 574 575 if (led->ontime == 0) 576 led->ontime = 512; 577 if (led->offtime == 0) 578 led->offtime = 512; 579 580 if (led->led_cdev.brightness == LED_OFF) 581 led->led_cdev.brightness = LED_FULL; 582 if (led_assign(led) < 0) { 583 led->ontime = 0; 584 led->offtime = 0; 585 led->led_cdev.brightness = LED_OFF; 586 return -EINVAL; 587 } 588 *delay_on = led->ontime; 589 *delay_off = led->offtime; 590 return 0; 591 } 592 593 #ifdef CONFIG_GPIOLIB 594 static void tca6507_gpio_set_value(struct gpio_chip *gc, 595 unsigned offset, int val) 596 { 597 struct tca6507_chip *tca = gpiochip_get_data(gc); 598 unsigned long flags; 599 600 spin_lock_irqsave(&tca->lock, flags); 601 /* 602 * 'OFF' is floating high, and 'ON' is pulled down, so it has 603 * the inverse sense of 'val'. 604 */ 605 set_select(tca, tca->gpio_map[offset], 606 val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON); 607 spin_unlock_irqrestore(&tca->lock, flags); 608 if (tca->reg_set) 609 schedule_work(&tca->work); 610 } 611 612 static int tca6507_gpio_direction_output(struct gpio_chip *gc, 613 unsigned offset, int val) 614 { 615 tca6507_gpio_set_value(gc, offset, val); 616 return 0; 617 } 618 619 static int tca6507_probe_gpios(struct device *dev, 620 struct tca6507_chip *tca, 621 struct tca6507_platform_data *pdata) 622 { 623 int err; 624 int i = 0; 625 int gpios = 0; 626 627 for (i = 0; i < NUM_LEDS; i++) 628 if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) { 629 /* Configure as a gpio */ 630 tca->gpio_map[gpios] = i; 631 gpios++; 632 } 633 634 if (!gpios) 635 return 0; 636 637 tca->gpio.label = "gpio-tca6507"; 638 tca->gpio.ngpio = gpios; 639 tca->gpio.base = pdata->gpio_base; 640 tca->gpio.owner = THIS_MODULE; 641 tca->gpio.direction_output = tca6507_gpio_direction_output; 642 tca->gpio.set = tca6507_gpio_set_value; 643 tca->gpio.parent = dev; 644 err = gpiochip_add_data(&tca->gpio, tca); 645 if (err) { 646 tca->gpio.ngpio = 0; 647 return err; 648 } 649 return 0; 650 } 651 652 static void tca6507_remove_gpio(struct tca6507_chip *tca) 653 { 654 if (tca->gpio.ngpio) 655 gpiochip_remove(&tca->gpio); 656 } 657 #else /* CONFIG_GPIOLIB */ 658 static int tca6507_probe_gpios(struct device *dev, 659 struct tca6507_chip *tca, 660 struct tca6507_platform_data *pdata) 661 { 662 return 0; 663 } 664 static void tca6507_remove_gpio(struct tca6507_chip *tca) 665 { 666 } 667 #endif /* CONFIG_GPIOLIB */ 668 669 static struct tca6507_platform_data * 670 tca6507_led_dt_init(struct device *dev) 671 { 672 struct tca6507_platform_data *pdata; 673 struct fwnode_handle *child; 674 struct led_info *tca_leds; 675 int count; 676 677 count = device_get_child_node_count(dev); 678 if (!count || count > NUM_LEDS) 679 return ERR_PTR(-ENODEV); 680 681 tca_leds = devm_kcalloc(dev, NUM_LEDS, sizeof(struct led_info), 682 GFP_KERNEL); 683 if (!tca_leds) 684 return ERR_PTR(-ENOMEM); 685 686 device_for_each_child_node(dev, child) { 687 struct led_info led; 688 u32 reg; 689 int ret; 690 691 if (fwnode_property_read_string(child, "label", &led.name)) 692 led.name = fwnode_get_name(child); 693 694 fwnode_property_read_string(child, "linux,default-trigger", 695 &led.default_trigger); 696 697 led.flags = 0; 698 if (fwnode_property_match_string(child, "compatible", 699 "gpio") >= 0) 700 led.flags |= TCA6507_MAKE_GPIO; 701 702 ret = fwnode_property_read_u32(child, "reg", ®); 703 if (ret || reg >= NUM_LEDS) { 704 fwnode_handle_put(child); 705 return ERR_PTR(ret ? : -EINVAL); 706 } 707 708 tca_leds[reg] = led; 709 } 710 711 pdata = devm_kzalloc(dev, sizeof(struct tca6507_platform_data), 712 GFP_KERNEL); 713 if (!pdata) 714 return ERR_PTR(-ENOMEM); 715 716 pdata->leds.leds = tca_leds; 717 pdata->leds.num_leds = NUM_LEDS; 718 #ifdef CONFIG_GPIOLIB 719 pdata->gpio_base = -1; 720 #endif 721 722 return pdata; 723 } 724 725 static const struct of_device_id __maybe_unused of_tca6507_leds_match[] = { 726 { .compatible = "ti,tca6507", }, 727 {}, 728 }; 729 MODULE_DEVICE_TABLE(of, of_tca6507_leds_match); 730 731 static int tca6507_probe(struct i2c_client *client, 732 const struct i2c_device_id *id) 733 { 734 struct device *dev = &client->dev; 735 struct i2c_adapter *adapter; 736 struct tca6507_chip *tca; 737 struct tca6507_platform_data *pdata; 738 int err; 739 int i = 0; 740 741 adapter = client->adapter; 742 743 if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) 744 return -EIO; 745 746 pdata = tca6507_led_dt_init(dev); 747 if (IS_ERR(pdata)) { 748 dev_err(dev, "Need %d entries in platform-data list\n", NUM_LEDS); 749 return PTR_ERR(pdata); 750 } 751 tca = devm_kzalloc(dev, sizeof(*tca), GFP_KERNEL); 752 if (!tca) 753 return -ENOMEM; 754 755 tca->client = client; 756 INIT_WORK(&tca->work, tca6507_work); 757 spin_lock_init(&tca->lock); 758 i2c_set_clientdata(client, tca); 759 760 for (i = 0; i < NUM_LEDS; i++) { 761 struct tca6507_led *l = tca->leds + i; 762 763 l->chip = tca; 764 l->num = i; 765 if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) { 766 l->led_cdev.name = pdata->leds.leds[i].name; 767 l->led_cdev.default_trigger 768 = pdata->leds.leds[i].default_trigger; 769 l->led_cdev.brightness_set = tca6507_brightness_set; 770 l->led_cdev.blink_set = tca6507_blink_set; 771 l->bank = -1; 772 err = led_classdev_register(dev, &l->led_cdev); 773 if (err < 0) 774 goto exit; 775 } 776 } 777 err = tca6507_probe_gpios(dev, tca, pdata); 778 if (err) 779 goto exit; 780 /* set all registers to known state - zero */ 781 tca->reg_set = 0x7f; 782 schedule_work(&tca->work); 783 784 return 0; 785 exit: 786 while (i--) { 787 if (tca->leds[i].led_cdev.name) 788 led_classdev_unregister(&tca->leds[i].led_cdev); 789 } 790 return err; 791 } 792 793 static void tca6507_remove(struct i2c_client *client) 794 { 795 int i; 796 struct tca6507_chip *tca = i2c_get_clientdata(client); 797 struct tca6507_led *tca_leds = tca->leds; 798 799 for (i = 0; i < NUM_LEDS; i++) { 800 if (tca_leds[i].led_cdev.name) 801 led_classdev_unregister(&tca_leds[i].led_cdev); 802 } 803 tca6507_remove_gpio(tca); 804 cancel_work_sync(&tca->work); 805 } 806 807 static struct i2c_driver tca6507_driver = { 808 .driver = { 809 .name = "leds-tca6507", 810 .of_match_table = of_match_ptr(of_tca6507_leds_match), 811 }, 812 .probe = tca6507_probe, 813 .remove = tca6507_remove, 814 .id_table = tca6507_id, 815 }; 816 817 module_i2c_driver(tca6507_driver); 818 819 MODULE_AUTHOR("NeilBrown <neilb@suse.de>"); 820 MODULE_DESCRIPTION("TCA6507 LED/GPO driver"); 821 MODULE_LICENSE("GPL v2"); 822