1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2007-2008 Extreme Engineering Solutions, Inc. 4 * 5 * Author: Nate Case <ncase@xes-inc.com> 6 * 7 * LED driver for various PCA955x I2C LED drivers 8 * 9 * Supported devices: 10 * 11 * Device Description 7-bit slave address 12 * ------ ----------- ------------------- 13 * PCA9550 2-bit driver 0x60 .. 0x61 14 * PCA9551 8-bit driver 0x60 .. 0x67 15 * PCA9552 16-bit driver 0x60 .. 0x67 16 * PCA9553/01 4-bit driver 0x62 17 * PCA9553/02 4-bit driver 0x63 18 * 19 * Philips PCA955x LED driver chips follow a register map as shown below: 20 * 21 * Control Register Description 22 * ---------------- ----------- 23 * 0x0 Input register 0 24 * .. 25 * NUM_INPUT_REGS - 1 Last Input register X 26 * 27 * NUM_INPUT_REGS Frequency prescaler 0 28 * NUM_INPUT_REGS + 1 PWM register 0 29 * NUM_INPUT_REGS + 2 Frequency prescaler 1 30 * NUM_INPUT_REGS + 3 PWM register 1 31 * 32 * NUM_INPUT_REGS + 4 LED selector 0 33 * NUM_INPUT_REGS + 4 34 * + NUM_LED_REGS - 1 Last LED selector 35 * 36 * where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many 37 * bits the chip supports. 38 */ 39 40 #include <linux/bitops.h> 41 #include <linux/ctype.h> 42 #include <linux/delay.h> 43 #include <linux/err.h> 44 #include <linux/gpio/driver.h> 45 #include <linux/i2c.h> 46 #include <linux/leds.h> 47 #include <linux/module.h> 48 #include <linux/of.h> 49 #include <linux/property.h> 50 #include <linux/slab.h> 51 #include <linux/string.h> 52 53 #include <dt-bindings/leds/leds-pca955x.h> 54 55 /* LED select registers determine the source that drives LED outputs */ 56 #define PCA955X_LS_LED_ON 0x0 /* Output LOW */ 57 #define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */ 58 #define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */ 59 #define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */ 60 61 #define PCA955X_GPIO_INPUT LED_OFF 62 #define PCA955X_GPIO_HIGH LED_OFF 63 #define PCA955X_GPIO_LOW LED_FULL 64 65 #define PCA955X_BLINK_DEFAULT_MS 1000 66 67 enum pca955x_type { 68 pca9550, 69 pca9551, 70 pca9552, 71 ibm_pca9552, 72 pca9553, 73 }; 74 75 struct pca955x_chipdef { 76 u8 bits; 77 u8 slv_addr; /* 7-bit slave address mask */ 78 int slv_addr_shift; /* Number of bits to ignore */ 79 int blink_div; /* PSC divider */ 80 }; 81 82 static const struct pca955x_chipdef pca955x_chipdefs[] = { 83 [pca9550] = { 84 .bits = 2, 85 .slv_addr = /* 110000x */ 0x60, 86 .slv_addr_shift = 1, 87 .blink_div = 44, 88 }, 89 [pca9551] = { 90 .bits = 8, 91 .slv_addr = /* 1100xxx */ 0x60, 92 .slv_addr_shift = 3, 93 .blink_div = 38, 94 }, 95 [pca9552] = { 96 .bits = 16, 97 .slv_addr = /* 1100xxx */ 0x60, 98 .slv_addr_shift = 3, 99 .blink_div = 44, 100 }, 101 [ibm_pca9552] = { 102 .bits = 16, 103 .slv_addr = /* 0110xxx */ 0x30, 104 .slv_addr_shift = 3, 105 .blink_div = 44, 106 }, 107 [pca9553] = { 108 .bits = 4, 109 .slv_addr = /* 110001x */ 0x62, 110 .slv_addr_shift = 1, 111 .blink_div = 44, 112 }, 113 }; 114 115 struct pca955x { 116 struct mutex lock; 117 struct pca955x_led *leds; 118 const struct pca955x_chipdef *chipdef; 119 struct i2c_client *client; 120 unsigned long active_blink; 121 unsigned long active_pins; 122 unsigned long blink_period; 123 #ifdef CONFIG_LEDS_PCA955X_GPIO 124 struct gpio_chip gpio; 125 #endif 126 }; 127 128 struct pca955x_led { 129 struct pca955x *pca955x; 130 struct led_classdev led_cdev; 131 int led_num; /* 0 .. 15 potentially */ 132 u32 type; 133 enum led_default_state default_state; 134 struct fwnode_handle *fwnode; 135 }; 136 137 #define led_to_pca955x(l) container_of(l, struct pca955x_led, led_cdev) 138 139 struct pca955x_platform_data { 140 struct pca955x_led *leds; 141 int num_leds; 142 }; 143 144 /* 8 bits per input register */ 145 static inline u8 pca955x_num_input_regs(u8 bits) 146 { 147 return (bits + 7) / 8; 148 } 149 150 /* 4 bits per LED selector register */ 151 static inline u8 pca955x_num_led_regs(u8 bits) 152 { 153 return (bits + 3) / 4; 154 } 155 156 /* 157 * Return an LED selector register value based on an existing one, with 158 * the appropriate 2-bit state value set for the given LED number (0-3). 159 */ 160 static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state) 161 { 162 return (oldval & (~(0x3 << (led_num << 1)))) | 163 ((state & 0x3) << (led_num << 1)); 164 } 165 166 static inline int pca955x_ledstate(u8 ls, int led_num) 167 { 168 return (ls >> (led_num << 1)) & 0x3; 169 } 170 171 /* 172 * Write to frequency prescaler register, used to program the 173 * period of the PWM output. period = (PSCx + 1) / coeff 174 * Where for pca9551 chips coeff = 38 and for all other chips coeff = 44 175 */ 176 static int pca955x_write_psc(struct pca955x *pca955x, int n, u8 val) 177 { 178 u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + (2 * n); 179 int ret; 180 181 ret = i2c_smbus_write_byte_data(pca955x->client, cmd, val); 182 if (ret < 0) 183 dev_err(&pca955x->client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, n, 184 val, ret); 185 return ret; 186 } 187 188 /* 189 * Write to PWM register, which determines the duty cycle of the 190 * output. LED is OFF when the count is less than the value of this 191 * register, and ON when it is greater. If PWMx == 0, LED is always OFF. 192 * 193 * Duty cycle is (256 - PWMx) / 256 194 */ 195 static int pca955x_write_pwm(struct pca955x *pca955x, int n, u8 val) 196 { 197 u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); 198 int ret; 199 200 ret = i2c_smbus_write_byte_data(pca955x->client, cmd, val); 201 if (ret < 0) 202 dev_err(&pca955x->client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, n, 203 val, ret); 204 return ret; 205 } 206 207 /* 208 * Write to LED selector register, which determines the source that 209 * drives the LED output. 210 */ 211 static int pca955x_write_ls(struct pca955x *pca955x, int n, u8 val) 212 { 213 u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n; 214 int ret; 215 216 ret = i2c_smbus_write_byte_data(pca955x->client, cmd, val); 217 if (ret < 0) 218 dev_err(&pca955x->client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, n, 219 val, ret); 220 return ret; 221 } 222 223 /* 224 * Read the LED selector register, which determines the source that 225 * drives the LED output. 226 */ 227 static int pca955x_read_ls(struct pca955x *pca955x, int n, u8 *val) 228 { 229 u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n; 230 int ret; 231 232 ret = i2c_smbus_read_byte_data(pca955x->client, cmd); 233 if (ret < 0) { 234 dev_err(&pca955x->client->dev, "%s: reg 0x%x, err %d\n", __func__, n, ret); 235 return ret; 236 } 237 *val = (u8)ret; 238 return 0; 239 } 240 241 static int pca955x_read_pwm(struct pca955x *pca955x, int n, u8 *val) 242 { 243 u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); 244 int ret; 245 246 ret = i2c_smbus_read_byte_data(pca955x->client, cmd); 247 if (ret < 0) { 248 dev_err(&pca955x->client->dev, "%s: reg 0x%x, err %d\n", __func__, n, ret); 249 return ret; 250 } 251 *val = (u8)ret; 252 return 0; 253 } 254 255 static int pca955x_read_psc(struct pca955x *pca955x, int n, u8 *val) 256 { 257 int ret; 258 u8 cmd; 259 260 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + (2 * n); 261 ret = i2c_smbus_read_byte_data(pca955x->client, cmd); 262 if (ret < 0) { 263 dev_err(&pca955x->client->dev, "%s: reg 0x%x, err %d\n", __func__, n, ret); 264 return ret; 265 } 266 *val = (u8)ret; 267 return 0; 268 } 269 270 static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev) 271 { 272 struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev); 273 struct pca955x *pca955x = pca955x_led->pca955x; 274 u8 ls, pwm; 275 int ret; 276 277 ret = pca955x_read_ls(pca955x, pca955x_led->led_num / 4, &ls); 278 if (ret) 279 return ret; 280 281 switch (pca955x_ledstate(ls, pca955x_led->led_num % 4)) { 282 case PCA955X_LS_LED_ON: 283 case PCA955X_LS_BLINK0: 284 ret = LED_FULL; 285 break; 286 case PCA955X_LS_LED_OFF: 287 ret = LED_OFF; 288 break; 289 case PCA955X_LS_BLINK1: 290 ret = pca955x_read_pwm(pca955x, 1, &pwm); 291 if (ret) 292 return ret; 293 ret = 255 - pwm; 294 break; 295 } 296 297 return ret; 298 } 299 300 static int pca955x_led_set(struct led_classdev *led_cdev, 301 enum led_brightness value) 302 { 303 struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev); 304 struct pca955x *pca955x = pca955x_led->pca955x; 305 int reg = pca955x_led->led_num / 4; 306 int bit = pca955x_led->led_num % 4; 307 u8 ls; 308 int ret; 309 310 mutex_lock(&pca955x->lock); 311 312 ret = pca955x_read_ls(pca955x, reg, &ls); 313 if (ret) 314 goto out; 315 316 if (test_bit(pca955x_led->led_num, &pca955x->active_blink)) { 317 if (value == LED_OFF) { 318 clear_bit(pca955x_led->led_num, &pca955x->active_blink); 319 ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_OFF); 320 } else { 321 /* No variable brightness for blinking LEDs */ 322 goto out; 323 } 324 } else { 325 switch (value) { 326 case LED_FULL: 327 ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_ON); 328 break; 329 case LED_OFF: 330 ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_OFF); 331 break; 332 default: 333 /* 334 * Use PWM1 for all other values. This has the unwanted 335 * side effect of making all LEDs on the chip share the 336 * same brightness level if set to a value other than 337 * OFF or FULL. But, this is probably better than just 338 * turning off for all other values. 339 */ 340 ret = pca955x_write_pwm(pca955x, 1, 255 - value); 341 if (ret) 342 goto out; 343 ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK1); 344 break; 345 } 346 } 347 348 ret = pca955x_write_ls(pca955x, reg, ls); 349 350 out: 351 mutex_unlock(&pca955x->lock); 352 353 return ret; 354 } 355 356 static u8 pca955x_period_to_psc(struct pca955x *pca955x, unsigned long period) 357 { 358 /* psc register value = (blink period * coeff) - 1 */ 359 period *= pca955x->chipdef->blink_div; 360 period /= MSEC_PER_SEC; 361 period -= 1; 362 363 return period; 364 } 365 366 static unsigned long pca955x_psc_to_period(struct pca955x *pca955x, u8 psc) 367 { 368 unsigned long period = psc; 369 370 /* blink period = (psc register value + 1) / coeff */ 371 period += 1; 372 period *= MSEC_PER_SEC; 373 period /= pca955x->chipdef->blink_div; 374 375 return period; 376 } 377 378 static int pca955x_led_blink(struct led_classdev *led_cdev, 379 unsigned long *delay_on, unsigned long *delay_off) 380 { 381 struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev); 382 struct pca955x *pca955x = pca955x_led->pca955x; 383 unsigned long period = *delay_on + *delay_off; 384 int ret = 0; 385 386 mutex_lock(&pca955x->lock); 387 388 if (period) { 389 if (*delay_on != *delay_off) { 390 ret = -EINVAL; 391 goto out; 392 } 393 394 if (period < pca955x_psc_to_period(pca955x, 0) || 395 period > pca955x_psc_to_period(pca955x, 0xff)) { 396 ret = -EINVAL; 397 goto out; 398 } 399 } else { 400 period = pca955x->active_blink ? pca955x->blink_period : 401 PCA955X_BLINK_DEFAULT_MS; 402 } 403 404 if (!pca955x->active_blink || 405 pca955x->active_blink == BIT(pca955x_led->led_num) || 406 pca955x->blink_period == period) { 407 u8 psc = pca955x_period_to_psc(pca955x, period); 408 409 if (!test_and_set_bit(pca955x_led->led_num, 410 &pca955x->active_blink)) { 411 u8 ls; 412 int reg = pca955x_led->led_num / 4; 413 int bit = pca955x_led->led_num % 4; 414 415 ret = pca955x_read_ls(pca955x, reg, &ls); 416 if (ret) 417 goto out; 418 419 ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK0); 420 ret = pca955x_write_ls(pca955x, reg, ls); 421 if (ret) 422 goto out; 423 424 /* 425 * Force 50% duty cycle to maintain the specified 426 * blink rate. 427 */ 428 ret = pca955x_write_pwm(pca955x, 0, 128); 429 if (ret) 430 goto out; 431 } 432 433 if (pca955x->blink_period != period) { 434 pca955x->blink_period = period; 435 ret = pca955x_write_psc(pca955x, 0, psc); 436 if (ret) 437 goto out; 438 } 439 440 period = pca955x_psc_to_period(pca955x, psc); 441 period /= 2; 442 *delay_on = period; 443 *delay_off = period; 444 } else { 445 ret = -EBUSY; 446 } 447 448 out: 449 mutex_unlock(&pca955x->lock); 450 451 return ret; 452 } 453 454 #ifdef CONFIG_LEDS_PCA955X_GPIO 455 /* 456 * Read the INPUT register, which contains the state of LEDs. 457 */ 458 static int pca955x_read_input(struct i2c_client *client, int n, u8 *val) 459 { 460 int ret = i2c_smbus_read_byte_data(client, n); 461 462 if (ret < 0) { 463 dev_err(&client->dev, "%s: reg 0x%x, err %d\n", 464 __func__, n, ret); 465 return ret; 466 } 467 *val = (u8)ret; 468 return 0; 469 470 } 471 472 static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset) 473 { 474 struct pca955x *pca955x = gpiochip_get_data(gc); 475 476 return test_and_set_bit(offset, &pca955x->active_pins) ? -EBUSY : 0; 477 } 478 479 static void pca955x_gpio_free_pin(struct gpio_chip *gc, unsigned int offset) 480 { 481 struct pca955x *pca955x = gpiochip_get_data(gc); 482 483 clear_bit(offset, &pca955x->active_pins); 484 } 485 486 static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset, 487 int val) 488 { 489 struct pca955x *pca955x = gpiochip_get_data(gc); 490 struct pca955x_led *led = &pca955x->leds[offset]; 491 492 if (val) 493 return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH); 494 495 return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW); 496 } 497 498 static int pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset, 499 int val) 500 { 501 return pca955x_set_value(gc, offset, val); 502 } 503 504 static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset) 505 { 506 struct pca955x *pca955x = gpiochip_get_data(gc); 507 struct pca955x_led *led = &pca955x->leds[offset]; 508 u8 reg = 0; 509 510 /* There is nothing we can do about errors */ 511 pca955x_read_input(pca955x->client, led->led_num / 8, ®); 512 513 return !!(reg & (1 << (led->led_num % 8))); 514 } 515 516 static int pca955x_gpio_direction_input(struct gpio_chip *gc, 517 unsigned int offset) 518 { 519 struct pca955x *pca955x = gpiochip_get_data(gc); 520 struct pca955x_led *led = &pca955x->leds[offset]; 521 522 /* To use as input ensure pin is not driven. */ 523 return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT); 524 } 525 526 static int pca955x_gpio_direction_output(struct gpio_chip *gc, 527 unsigned int offset, int val) 528 { 529 return pca955x_set_value(gc, offset, val); 530 } 531 #endif /* CONFIG_LEDS_PCA955X_GPIO */ 532 533 static struct pca955x_platform_data * 534 pca955x_get_pdata(struct i2c_client *client, const struct pca955x_chipdef *chip) 535 { 536 struct pca955x_platform_data *pdata; 537 struct pca955x_led *led; 538 struct fwnode_handle *child; 539 int count; 540 541 count = device_get_child_node_count(&client->dev); 542 if (count > chip->bits) 543 return ERR_PTR(-ENODEV); 544 545 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); 546 if (!pdata) 547 return ERR_PTR(-ENOMEM); 548 549 pdata->leds = devm_kcalloc(&client->dev, 550 chip->bits, sizeof(struct pca955x_led), 551 GFP_KERNEL); 552 if (!pdata->leds) 553 return ERR_PTR(-ENOMEM); 554 555 device_for_each_child_node(&client->dev, child) { 556 u32 reg; 557 int res; 558 559 res = fwnode_property_read_u32(child, "reg", ®); 560 if ((res != 0) || (reg >= chip->bits)) 561 continue; 562 563 led = &pdata->leds[reg]; 564 led->type = PCA955X_TYPE_LED; 565 led->fwnode = child; 566 led->default_state = led_init_default_state_get(child); 567 568 fwnode_property_read_u32(child, "type", &led->type); 569 } 570 571 pdata->num_leds = chip->bits; 572 573 return pdata; 574 } 575 576 static int pca955x_probe(struct i2c_client *client) 577 { 578 struct pca955x *pca955x; 579 struct pca955x_led *pca955x_led; 580 const struct pca955x_chipdef *chip; 581 struct led_classdev *led; 582 struct led_init_data init_data; 583 struct i2c_adapter *adapter; 584 u8 i, nls, psc0; 585 u8 ls1[4]; 586 u8 ls2[4]; 587 struct pca955x_platform_data *pdata; 588 bool keep_psc0 = false; 589 bool set_default_label = false; 590 char default_label[8]; 591 int bit, err, reg; 592 593 chip = i2c_get_match_data(client); 594 if (!chip) 595 return dev_err_probe(&client->dev, -ENODEV, "unknown chip\n"); 596 597 adapter = client->adapter; 598 pdata = dev_get_platdata(&client->dev); 599 if (!pdata) { 600 pdata = pca955x_get_pdata(client, chip); 601 if (IS_ERR(pdata)) 602 return PTR_ERR(pdata); 603 } 604 605 /* Make sure the slave address / chip type combo given is possible */ 606 if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) != 607 chip->slv_addr) { 608 dev_err(&client->dev, "invalid slave address %02x\n", 609 client->addr); 610 return -ENODEV; 611 } 612 613 dev_info(&client->dev, "Using %s %u-bit LED driver at slave address 0x%02x\n", 614 client->name, chip->bits, client->addr); 615 616 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 617 return -EIO; 618 619 if (pdata->num_leds != chip->bits) { 620 dev_err(&client->dev, 621 "board info claims %d LEDs on a %u-bit chip\n", 622 pdata->num_leds, chip->bits); 623 return -ENODEV; 624 } 625 626 pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL); 627 if (!pca955x) 628 return -ENOMEM; 629 630 pca955x->leds = devm_kcalloc(&client->dev, chip->bits, 631 sizeof(*pca955x_led), GFP_KERNEL); 632 if (!pca955x->leds) 633 return -ENOMEM; 634 635 i2c_set_clientdata(client, pca955x); 636 637 mutex_init(&pca955x->lock); 638 pca955x->client = client; 639 pca955x->chipdef = chip; 640 pca955x->blink_period = PCA955X_BLINK_DEFAULT_MS; 641 642 init_data.devname_mandatory = false; 643 init_data.devicename = "pca955x"; 644 645 nls = pca955x_num_led_regs(chip->bits); 646 /* Use auto-increment feature to read all the LED selectors at once. */ 647 err = i2c_smbus_read_i2c_block_data(client, 648 0x10 | (pca955x_num_input_regs(chip->bits) + 4), nls, 649 ls1); 650 if (err < 0) 651 return err; 652 653 for (i = 0; i < nls; i++) 654 ls2[i] = ls1[i]; 655 656 for (i = 0; i < chip->bits; i++) { 657 pca955x_led = &pca955x->leds[i]; 658 pca955x_led->led_num = i; 659 pca955x_led->pca955x = pca955x; 660 pca955x_led->type = pdata->leds[i].type; 661 662 switch (pca955x_led->type) { 663 case PCA955X_TYPE_NONE: 664 case PCA955X_TYPE_GPIO: 665 break; 666 case PCA955X_TYPE_LED: 667 bit = i % 4; 668 reg = i / 4; 669 led = &pca955x_led->led_cdev; 670 led->brightness_set_blocking = pca955x_led_set; 671 led->brightness_get = pca955x_led_get; 672 led->blink_set = pca955x_led_blink; 673 674 if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF) 675 ls2[reg] = pca955x_ledsel(ls2[reg], bit, PCA955X_LS_LED_OFF); 676 else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON) 677 ls2[reg] = pca955x_ledsel(ls2[reg], bit, PCA955X_LS_LED_ON); 678 else if (pca955x_ledstate(ls2[reg], bit) == PCA955X_LS_BLINK0) { 679 keep_psc0 = true; 680 set_bit(i, &pca955x->active_blink); 681 } 682 683 init_data.fwnode = pdata->leds[i].fwnode; 684 685 if (is_of_node(init_data.fwnode)) { 686 if (to_of_node(init_data.fwnode)->name[0] == 687 '\0') 688 set_default_label = true; 689 else 690 set_default_label = false; 691 } else { 692 set_default_label = true; 693 } 694 695 if (set_default_label) { 696 snprintf(default_label, sizeof(default_label), "%u", i); 697 init_data.default_label = default_label; 698 } else { 699 init_data.default_label = NULL; 700 } 701 702 err = devm_led_classdev_register_ext(&client->dev, led, 703 &init_data); 704 if (err) 705 return err; 706 707 set_bit(i, &pca955x->active_pins); 708 } 709 } 710 711 for (i = 0; i < nls; i++) { 712 if (ls1[i] != ls2[i]) { 713 err = pca955x_write_ls(pca955x, i, ls2[i]); 714 if (err) 715 return err; 716 } 717 } 718 719 if (keep_psc0) { 720 err = pca955x_read_psc(pca955x, 0, &psc0); 721 } else { 722 psc0 = pca955x_period_to_psc(pca955x, pca955x->blink_period); 723 err = pca955x_write_psc(pca955x, 0, psc0); 724 } 725 726 if (err) 727 return err; 728 729 pca955x->blink_period = pca955x_psc_to_period(pca955x, psc0); 730 731 /* Set PWM1 to fast frequency so we do not see flashing */ 732 err = pca955x_write_psc(pca955x, 1, 0); 733 if (err) 734 return err; 735 736 #ifdef CONFIG_LEDS_PCA955X_GPIO 737 pca955x->gpio.label = "gpio-pca955x"; 738 pca955x->gpio.direction_input = pca955x_gpio_direction_input; 739 pca955x->gpio.direction_output = pca955x_gpio_direction_output; 740 pca955x->gpio.set_rv = pca955x_gpio_set_value; 741 pca955x->gpio.get = pca955x_gpio_get_value; 742 pca955x->gpio.request = pca955x_gpio_request_pin; 743 pca955x->gpio.free = pca955x_gpio_free_pin; 744 pca955x->gpio.can_sleep = 1; 745 pca955x->gpio.base = -1; 746 pca955x->gpio.ngpio = chip->bits; 747 pca955x->gpio.parent = &client->dev; 748 pca955x->gpio.owner = THIS_MODULE; 749 750 err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio, 751 pca955x); 752 if (err) { 753 /* Use data->gpio.dev as a flag for freeing gpiochip */ 754 pca955x->gpio.parent = NULL; 755 dev_warn(&client->dev, "could not add gpiochip\n"); 756 return err; 757 } 758 dev_info(&client->dev, "gpios %i...%i\n", 759 pca955x->gpio.base, pca955x->gpio.base + 760 pca955x->gpio.ngpio - 1); 761 #endif 762 763 return 0; 764 } 765 766 static const struct i2c_device_id pca955x_id[] = { 767 { "pca9550", (kernel_ulong_t)&pca955x_chipdefs[pca9550] }, 768 { "pca9551", (kernel_ulong_t)&pca955x_chipdefs[pca9551] }, 769 { "pca9552", (kernel_ulong_t)&pca955x_chipdefs[pca9552] }, 770 { "ibm-pca9552", (kernel_ulong_t)&pca955x_chipdefs[ibm_pca9552] }, 771 { "pca9553", (kernel_ulong_t)&pca955x_chipdefs[pca9553] }, 772 {} 773 }; 774 MODULE_DEVICE_TABLE(i2c, pca955x_id); 775 776 static const struct of_device_id of_pca955x_match[] = { 777 { .compatible = "nxp,pca9550", .data = &pca955x_chipdefs[pca9550] }, 778 { .compatible = "nxp,pca9551", .data = &pca955x_chipdefs[pca9551] }, 779 { .compatible = "nxp,pca9552", .data = &pca955x_chipdefs[pca9552] }, 780 { .compatible = "ibm,pca9552", .data = &pca955x_chipdefs[ibm_pca9552] }, 781 { .compatible = "nxp,pca9553", .data = &pca955x_chipdefs[pca9553] }, 782 {} 783 }; 784 MODULE_DEVICE_TABLE(of, of_pca955x_match); 785 786 static struct i2c_driver pca955x_driver = { 787 .driver = { 788 .name = "leds-pca955x", 789 .of_match_table = of_pca955x_match, 790 }, 791 .probe = pca955x_probe, 792 .id_table = pca955x_id, 793 }; 794 795 module_i2c_driver(pca955x_driver); 796 797 MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>"); 798 MODULE_DESCRIPTION("PCA955x LED driver"); 799 MODULE_LICENSE("GPL v2"); 800