drivers/leds/leds-pca955x.c

   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 enum pca955x_type {
  66         pca9550,
  67         pca9551,
  68         pca9552,
  69         ibm_pca9552,
  70         pca9553,
  71 };
  72
  73 struct pca955x_chipdef {
  74         int                     bits;
  75         u8                      slv_addr;       /* 7-bit slave address mask */
  76         int                     slv_addr_shift; /* Number of bits to ignore */
  77 };
  78
  79 static const struct pca955x_chipdef pca955x_chipdefs[] = {
  80         [pca9550] = {
  81                 .bits           = 2,
  82                 .slv_addr       = /* 110000x */ 0x60,
  83                 .slv_addr_shift = 1,
  84         },
  85         [pca9551] = {
  86                 .bits           = 8,
  87                 .slv_addr       = /* 1100xxx */ 0x60,
  88                 .slv_addr_shift = 3,
  89         },
  90         [pca9552] = {
  91                 .bits           = 16,
  92                 .slv_addr       = /* 1100xxx */ 0x60,
  93                 .slv_addr_shift = 3,
  94         },
  95         [ibm_pca9552] = {
  96                 .bits           = 16,
  97                 .slv_addr       = /* 0110xxx */ 0x30,
  98                 .slv_addr_shift = 3,
  99         },
 100         [pca9553] = {
 101                 .bits           = 4,
 102                 .slv_addr       = /* 110001x */ 0x62,
 103                 .slv_addr_shift = 1,
 104         },
 105 };
 106
 107 struct pca955x {
 108         struct mutex lock;
 109         struct pca955x_led *leds;
 110         const struct pca955x_chipdef    *chipdef;
 111         struct i2c_client       *client;
 112         unsigned long active_pins;
 113 #ifdef CONFIG_LEDS_PCA955X_GPIO
 114         struct gpio_chip gpio;
 115 #endif
 116 };
 117
 118 struct pca955x_led {
 119         struct pca955x  *pca955x;
 120         struct led_classdev     led_cdev;
 121         int                     led_num;        /* 0 .. 15 potentially */
 122         u32                     type;
 123         enum led_default_state  default_state;
 124         struct fwnode_handle    *fwnode;
 125 };
 126
 127 struct pca955x_platform_data {
 128         struct pca955x_led      *leds;
 129         int                     num_leds;
 130 };
 131
 132 /* 8 bits per input register */
 133 static inline int pca95xx_num_input_regs(int bits)
 134 {
 135         return (bits + 7) / 8;
 136 }
 137
 138 /*
 139  * Return an LED selector register value based on an existing one, with
 140  * the appropriate 2-bit state value set for the given LED number (0-3).
 141  */
 142 static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
 143 {
 144         return (oldval & (~(0x3 << (led_num << 1)))) |
 145                 ((state & 0x3) << (led_num << 1));
 146 }
 147
 148 /*
 149  * Write to frequency prescaler register, used to program the
 150  * period of the PWM output.  period = (PSCx + 1) / 38
 151  */
 152 static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
 153 {
 154         struct pca955x *pca955x = i2c_get_clientdata(client);
 155         u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n);
 156         int ret;
 157
 158         ret = i2c_smbus_write_byte_data(client, cmd, val);
 159         if (ret < 0)
 160                 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 161                         __func__, n, val, ret);
 162         return ret;
 163 }
 164
 165 /*
 166  * Write to PWM register, which determines the duty cycle of the
 167  * output.  LED is OFF when the count is less than the value of this
 168  * register, and ON when it is greater.  If PWMx == 0, LED is always OFF.
 169  *
 170  * Duty cycle is (256 - PWMx) / 256
 171  */
 172 static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
 173 {
 174         struct pca955x *pca955x = i2c_get_clientdata(client);
 175         u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
 176         int ret;
 177
 178         ret = i2c_smbus_write_byte_data(client, cmd, val);
 179         if (ret < 0)
 180                 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 181                         __func__, n, val, ret);
 182         return ret;
 183 }
 184
 185 /*
 186  * Write to LED selector register, which determines the source that
 187  * drives the LED output.
 188  */
 189 static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
 190 {
 191         struct pca955x *pca955x = i2c_get_clientdata(client);
 192         u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 193         int ret;
 194
 195         ret = i2c_smbus_write_byte_data(client, cmd, val);
 196         if (ret < 0)
 197                 dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
 198                         __func__, n, val, ret);
 199         return ret;
 200 }
 201
 202 /*
 203  * Read the LED selector register, which determines the source that
 204  * drives the LED output.
 205  */
 206 static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
 207 {
 208         struct pca955x *pca955x = i2c_get_clientdata(client);
 209         u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 210         int ret;
 211
 212         ret = i2c_smbus_read_byte_data(client, cmd);
 213         if (ret < 0) {
 214                 dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
 215                         __func__, n, ret);
 216                 return ret;
 217         }
 218         *val = (u8)ret;
 219         return 0;
 220 }
 221
 222 static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
 223 {
 224         struct pca955x *pca955x = i2c_get_clientdata(client);
 225         u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
 226         int ret;
 227
 228         ret = i2c_smbus_read_byte_data(client, cmd);
 229         if (ret < 0) {
 230                 dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
 231                         __func__, n, ret);
 232                 return ret;
 233         }
 234         *val = (u8)ret;
 235         return 0;
 236 }
 237
 238 static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
 239 {
 240         struct pca955x_led *pca955x_led = container_of(led_cdev,
 241                                                        struct pca955x_led,
 242                                                        led_cdev);
 243         struct pca955x *pca955x = pca955x_led->pca955x;
 244         u8 ls, pwm;
 245         int ret;
 246
 247         ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls);
 248         if (ret)
 249                 return ret;
 250
 251         ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
 252         switch (ls) {
 253         case PCA955X_LS_LED_ON:
 254                 ret = LED_FULL;
 255                 break;
 256         case PCA955X_LS_LED_OFF:
 257                 ret = LED_OFF;
 258                 break;
 259         case PCA955X_LS_BLINK0:
 260                 ret = LED_HALF;
 261                 break;
 262         case PCA955X_LS_BLINK1:
 263                 ret = pca955x_read_pwm(pca955x->client, 1, &pwm);
 264                 if (ret)
 265                         return ret;
 266                 ret = 255 - pwm;
 267                 break;
 268         }
 269
 270         return ret;
 271 }
 272
 273 static int pca955x_led_set(struct led_classdev *led_cdev,
 274                             enum led_brightness value)
 275 {
 276         struct pca955x_led *pca955x_led;
 277         struct pca955x *pca955x;
 278         u8 ls;
 279         int chip_ls;    /* which LSx to use (0-3 potentially) */
 280         int ls_led;     /* which set of bits within LSx to use (0-3) */
 281         int ret;
 282
 283         pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
 284         pca955x = pca955x_led->pca955x;
 285
 286         chip_ls = pca955x_led->led_num / 4;
 287         ls_led = pca955x_led->led_num % 4;
 288
 289         mutex_lock(&pca955x->lock);
 290
 291         ret = pca955x_read_ls(pca955x->client, chip_ls, &ls);
 292         if (ret)
 293                 goto out;
 294
 295         switch (value) {
 296         case LED_FULL:
 297                 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
 298                 break;
 299         case LED_OFF:
 300                 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
 301                 break;
 302         case LED_HALF:
 303                 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
 304                 break;
 305         default:
 306                 /*
 307                  * Use PWM1 for all other values.  This has the unwanted
 308                  * side effect of making all LEDs on the chip share the
 309                  * same brightness level if set to a value other than
 310                  * OFF, HALF, or FULL.  But, this is probably better than
 311                  * just turning off for all other values.
 312                  */
 313                 ret = pca955x_write_pwm(pca955x->client, 1, 255 - value);
 314                 if (ret)
 315                         goto out;
 316                 ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
 317                 break;
 318         }
 319
 320         ret = pca955x_write_ls(pca955x->client, chip_ls, ls);
 321
 322 out:
 323         mutex_unlock(&pca955x->lock);
 324
 325         return ret;
 326 }
 327
 328 #ifdef CONFIG_LEDS_PCA955X_GPIO
 329 /*
 330  * Read the INPUT register, which contains the state of LEDs.
 331  */
 332 static int pca955x_read_input(struct i2c_client *client, int n, u8 *val)
 333 {
 334         int ret = i2c_smbus_read_byte_data(client, n);
 335
 336         if (ret < 0) {
 337                 dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
 338                         __func__, n, ret);
 339                 return ret;
 340         }
 341         *val = (u8)ret;
 342         return 0;
 343
 344 }
 345
 346 static int pca955x_gpio_request_pin(struct gpio_chip *gc, unsigned int offset)
 347 {
 348         struct pca955x *pca955x = gpiochip_get_data(gc);
 349
 350         return test_and_set_bit(offset, &pca955x->active_pins) ? -EBUSY : 0;
 351 }
 352
 353 static void pca955x_gpio_free_pin(struct gpio_chip *gc, unsigned int offset)
 354 {
 355         struct pca955x *pca955x = gpiochip_get_data(gc);
 356
 357         clear_bit(offset, &pca955x->active_pins);
 358 }
 359
 360 static int pca955x_set_value(struct gpio_chip *gc, unsigned int offset,
 361                              int val)
 362 {
 363         struct pca955x *pca955x = gpiochip_get_data(gc);
 364         struct pca955x_led *led = &pca955x->leds[offset];
 365
 366         if (val)
 367                 return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_HIGH);
 368
 369         return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_LOW);
 370 }
 371
 372 static void pca955x_gpio_set_value(struct gpio_chip *gc, unsigned int offset,
 373                                    int val)
 374 {
 375         pca955x_set_value(gc, offset, val);
 376 }
 377
 378 static int pca955x_gpio_get_value(struct gpio_chip *gc, unsigned int offset)
 379 {
 380         struct pca955x *pca955x = gpiochip_get_data(gc);
 381         struct pca955x_led *led = &pca955x->leds[offset];
 382         u8 reg = 0;
 383
 384         /* There is nothing we can do about errors */
 385         pca955x_read_input(pca955x->client, led->led_num / 8, &reg);
 386
 387         return !!(reg & (1 << (led->led_num % 8)));
 388 }
 389
 390 static int pca955x_gpio_direction_input(struct gpio_chip *gc,
 391                                         unsigned int offset)
 392 {
 393         struct pca955x *pca955x = gpiochip_get_data(gc);
 394         struct pca955x_led *led = &pca955x->leds[offset];
 395
 396         /* To use as input ensure pin is not driven. */
 397         return pca955x_led_set(&led->led_cdev, PCA955X_GPIO_INPUT);
 398 }
 399
 400 static int pca955x_gpio_direction_output(struct gpio_chip *gc,
 401                                          unsigned int offset, int val)
 402 {
 403         return pca955x_set_value(gc, offset, val);
 404 }
 405 #endif /* CONFIG_LEDS_PCA955X_GPIO */
 406
 407 static struct pca955x_platform_data *
 408 pca955x_get_pdata(struct i2c_client *client, const struct pca955x_chipdef *chip)
 409 {
 410         struct pca955x_platform_data *pdata;
 411         struct pca955x_led *led;
 412         struct fwnode_handle *child;
 413         int count;
 414
 415         count = device_get_child_node_count(&client->dev);
 416         if (count > chip->bits)
 417                 return ERR_PTR(-ENODEV);
 418
 419         pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
 420         if (!pdata)
 421                 return ERR_PTR(-ENOMEM);
 422
 423         pdata->leds = devm_kcalloc(&client->dev,
 424                                    chip->bits, sizeof(struct pca955x_led),
 425                                    GFP_KERNEL);
 426         if (!pdata->leds)
 427                 return ERR_PTR(-ENOMEM);
 428
 429         device_for_each_child_node(&client->dev, child) {
 430                 u32 reg;
 431                 int res;
 432
 433                 res = fwnode_property_read_u32(child, "reg", &reg);
 434                 if ((res != 0) || (reg >= chip->bits))
 435                         continue;
 436
 437                 led = &pdata->leds[reg];
 438                 led->type = PCA955X_TYPE_LED;
 439                 led->fwnode = child;
 440                 led->default_state = led_init_default_state_get(child);
 441
 442                 fwnode_property_read_u32(child, "type", &led->type);
 443         }
 444
 445         pdata->num_leds = chip->bits;
 446
 447         return pdata;
 448 }
 449
 450 static int pca955x_probe(struct i2c_client *client)
 451 {
 452         struct pca955x *pca955x;
 453         struct pca955x_led *pca955x_led;
 454         const struct pca955x_chipdef *chip;
 455         struct led_classdev *led;
 456         struct led_init_data init_data;
 457         struct i2c_adapter *adapter;
 458         int i, err;
 459         struct pca955x_platform_data *pdata;
 460         bool set_default_label = false;
 461         bool keep_pwm = false;
 462         char default_label[8];
 463
 464         chip = i2c_get_match_data(client);
 465         if (!chip)
 466                 return dev_err_probe(&client->dev, -ENODEV, "unknown chip\n");
 467
 468         adapter = client->adapter;
 469         pdata = dev_get_platdata(&client->dev);
 470         if (!pdata) {
 471                 pdata = pca955x_get_pdata(client, chip);
 472                 if (IS_ERR(pdata))
 473                         return PTR_ERR(pdata);
 474         }
 475
 476         /* Make sure the slave address / chip type combo given is possible */
 477         if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
 478             chip->slv_addr) {
 479                 dev_err(&client->dev, "invalid slave address %02x\n",
 480                         client->addr);
 481                 return -ENODEV;
 482         }
 483
 484         dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
 485                  "slave address 0x%02x\n", client->name, chip->bits,
 486                  client->addr);
 487
 488         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 489                 return -EIO;
 490
 491         if (pdata->num_leds != chip->bits) {
 492                 dev_err(&client->dev,
 493                         "board info claims %d LEDs on a %d-bit chip\n",
 494                         pdata->num_leds, chip->bits);
 495                 return -ENODEV;
 496         }
 497
 498         pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
 499         if (!pca955x)
 500                 return -ENOMEM;
 501
 502         pca955x->leds = devm_kcalloc(&client->dev, chip->bits,
 503                                      sizeof(*pca955x_led), GFP_KERNEL);
 504         if (!pca955x->leds)
 505                 return -ENOMEM;
 506
 507         i2c_set_clientdata(client, pca955x);
 508
 509         mutex_init(&pca955x->lock);
 510         pca955x->client = client;
 511         pca955x->chipdef = chip;
 512
 513         init_data.devname_mandatory = false;
 514         init_data.devicename = "pca955x";
 515
 516         for (i = 0; i < chip->bits; i++) {
 517                 pca955x_led = &pca955x->leds[i];
 518                 pca955x_led->led_num = i;
 519                 pca955x_led->pca955x = pca955x;
 520                 pca955x_led->type = pdata->leds[i].type;
 521
 522                 switch (pca955x_led->type) {
 523                 case PCA955X_TYPE_NONE:
 524                 case PCA955X_TYPE_GPIO:
 525                         break;
 526                 case PCA955X_TYPE_LED:
 527                         led = &pca955x_led->led_cdev;
 528                         led->brightness_set_blocking = pca955x_led_set;
 529                         led->brightness_get = pca955x_led_get;
 530
 531                         if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF) {
 532                                 err = pca955x_led_set(led, LED_OFF);
 533                                 if (err)
 534                                         return err;
 535                         } else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON) {
 536                                 err = pca955x_led_set(led, LED_FULL);
 537                                 if (err)
 538                                         return err;
 539                         }
 540
 541                         init_data.fwnode = pdata->leds[i].fwnode;
 542
 543                         if (is_of_node(init_data.fwnode)) {
 544                                 if (to_of_node(init_data.fwnode)->name[0] ==
 545                                     '\0')
 546                                         set_default_label = true;
 547                                 else
 548                                         set_default_label = false;
 549                         } else {
 550                                 set_default_label = true;
 551                         }
 552
 553                         if (set_default_label) {
 554                                 snprintf(default_label, sizeof(default_label),
 555                                          "%d", i);
 556                                 init_data.default_label = default_label;
 557                         } else {
 558                                 init_data.default_label = NULL;
 559                         }
 560
 561                         err = devm_led_classdev_register_ext(&client->dev, led,
 562                                                              &init_data);
 563                         if (err)
 564                                 return err;
 565
 566                         set_bit(i, &pca955x->active_pins);
 567
 568                         /*
 569                          * For default-state == "keep", let the core update the
 570                          * brightness from the hardware, then check the
 571                          * brightness to see if it's using PWM1. If so, PWM1
 572                          * should not be written below.
 573                          */
 574                         if (pdata->leds[i].default_state == LEDS_DEFSTATE_KEEP) {
 575                                 if (led->brightness != LED_FULL &&
 576                                     led->brightness != LED_OFF &&
 577                                     led->brightness != LED_HALF)
 578                                         keep_pwm = true;
 579                         }
 580                 }
 581         }
 582
 583         /* PWM0 is used for half brightness or 50% duty cycle */
 584         err = pca955x_write_pwm(client, 0, 255 - LED_HALF);
 585         if (err)
 586                 return err;
 587
 588         if (!keep_pwm) {
 589                 /* PWM1 is used for variable brightness, default to OFF */
 590                 err = pca955x_write_pwm(client, 1, 0);
 591                 if (err)
 592                         return err;
 593         }
 594
 595         /* Set to fast frequency so we do not see flashing */
 596         err = pca955x_write_psc(client, 0, 0);
 597         if (err)
 598                 return err;
 599         err = pca955x_write_psc(client, 1, 0);
 600         if (err)
 601                 return err;
 602
 603 #ifdef CONFIG_LEDS_PCA955X_GPIO
 604         pca955x->gpio.label = "gpio-pca955x";
 605         pca955x->gpio.direction_input = pca955x_gpio_direction_input;
 606         pca955x->gpio.direction_output = pca955x_gpio_direction_output;
 607         pca955x->gpio.set = pca955x_gpio_set_value;
 608         pca955x->gpio.get = pca955x_gpio_get_value;
 609         pca955x->gpio.request = pca955x_gpio_request_pin;
 610         pca955x->gpio.free = pca955x_gpio_free_pin;
 611         pca955x->gpio.can_sleep = 1;
 612         pca955x->gpio.base = -1;
 613         pca955x->gpio.ngpio = chip->bits;
 614         pca955x->gpio.parent = &client->dev;
 615         pca955x->gpio.owner = THIS_MODULE;
 616
 617         err = devm_gpiochip_add_data(&client->dev, &pca955x->gpio,
 618                                      pca955x);
 619         if (err) {
 620                 /* Use data->gpio.dev as a flag for freeing gpiochip */
 621                 pca955x->gpio.parent = NULL;
 622                 dev_warn(&client->dev, "could not add gpiochip\n");
 623                 return err;
 624         }
 625         dev_info(&client->dev, "gpios %i...%i\n",
 626                  pca955x->gpio.base, pca955x->gpio.base +
 627                  pca955x->gpio.ngpio - 1);
 628 #endif
 629
 630         return 0;
 631 }
 632
 633 static const struct i2c_device_id pca955x_id[] = {
 634         { "pca9550", (kernel_ulong_t)&pca955x_chipdefs[pca9550] },
 635         { "pca9551", (kernel_ulong_t)&pca955x_chipdefs[pca9551] },
 636         { "pca9552", (kernel_ulong_t)&pca955x_chipdefs[pca9552] },
 637         { "ibm-pca9552", (kernel_ulong_t)&pca955x_chipdefs[ibm_pca9552] },
 638         { "pca9553", (kernel_ulong_t)&pca955x_chipdefs[pca9553] },
 639         {}
 640 };
 641 MODULE_DEVICE_TABLE(i2c, pca955x_id);
 642
 643 static const struct of_device_id of_pca955x_match[] = {
 644         { .compatible = "nxp,pca9550", .data = &pca955x_chipdefs[pca9550] },
 645         { .compatible = "nxp,pca9551", .data = &pca955x_chipdefs[pca9551] },
 646         { .compatible = "nxp,pca9552", .data = &pca955x_chipdefs[pca9552] },
 647         { .compatible = "ibm,pca9552", .data = &pca955x_chipdefs[ibm_pca9552] },
 648         { .compatible = "nxp,pca9553", .data = &pca955x_chipdefs[pca9553] },
 649         {}
 650 };
 651 MODULE_DEVICE_TABLE(of, of_pca955x_match);
 652
 653 static struct i2c_driver pca955x_driver = {
 654         .driver = {
 655                 .name   = "leds-pca955x",
 656                 .of_match_table = of_pca955x_match,
 657         },
 658         .probe = pca955x_probe,
 659         .id_table = pca955x_id,
 660 };
 661
 662 module_i2c_driver(pca955x_driver);
 663
 664 MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
 665 MODULE_DESCRIPTION("PCA955x LED driver");
 666 MODULE_LICENSE("GPL v2");