1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2015-16 Golden Delicious Computers 4 * 5 * Author: Nikolaus Schaller <hns@goldelico.com> 6 * 7 * LED driver for the IS31FL319{0,1,3,6,9} to drive 1, 3, 6 or 9 light 8 * effect LEDs. 9 */ 10 11 #include <linux/err.h> 12 #include <linux/i2c.h> 13 #include <linux/leds.h> 14 #include <linux/mod_devicetable.h> 15 #include <linux/module.h> 16 #include <linux/property.h> 17 #include <linux/regmap.h> 18 #include <linux/slab.h> 19 #include <linux/delay.h> 20 #include <linux/gpio/consumer.h> 21 22 /* register numbers */ 23 #define IS31FL319X_SHUTDOWN 0x00 24 25 /* registers for 3190, 3191 and 3193 */ 26 #define IS31FL3190_BREATHING 0x01 27 #define IS31FL3190_LEDMODE 0x02 28 #define IS31FL3190_CURRENT 0x03 29 #define IS31FL3190_PWM(channel) (0x04 + channel) 30 #define IS31FL3190_DATA_UPDATE 0x07 31 #define IS31FL3190_T0(channel) (0x0a + channel) 32 #define IS31FL3190_T1T2(channel) (0x10 + channel) 33 #define IS31FL3190_T3T4(channel) (0x16 + channel) 34 #define IS31FL3190_TIME_UPDATE 0x1c 35 #define IS31FL3190_LEDCONTROL 0x1d 36 #define IS31FL3190_RESET 0x2f 37 38 #define IS31FL3190_CURRENT_uA_MIN 5000 39 #define IS31FL3190_CURRENT_uA_DEFAULT 42000 40 #define IS31FL3190_CURRENT_uA_MAX 42000 41 #define IS31FL3190_CURRENT_MASK GENMASK(4, 2) 42 #define IS31FL3190_CURRENT_5_mA 0x02 43 #define IS31FL3190_CURRENT_10_mA 0x01 44 #define IS31FL3190_CURRENT_17dot5_mA 0x04 45 #define IS31FL3190_CURRENT_30_mA 0x03 46 #define IS31FL3190_CURRENT_42_mA 0x00 47 48 /* registers for 3196 and 3199 */ 49 #define IS31FL3196_CTRL1 0x01 50 #define IS31FL3196_CTRL2 0x02 51 #define IS31FL3196_CONFIG1 0x03 52 #define IS31FL3196_CONFIG2 0x04 53 #define IS31FL3196_RAMP_MODE 0x05 54 #define IS31FL3196_BREATH_MARK 0x06 55 #define IS31FL3196_PWM(channel) (0x07 + channel) 56 #define IS31FL3196_DATA_UPDATE 0x10 57 #define IS31FL3196_T0(channel) (0x11 + channel) 58 #define IS31FL3196_T123_1 0x1a 59 #define IS31FL3196_T123_2 0x1b 60 #define IS31FL3196_T123_3 0x1c 61 #define IS31FL3196_T4(channel) (0x1d + channel) 62 #define IS31FL3196_TIME_UPDATE 0x26 63 #define IS31FL3196_RESET 0xff 64 65 #define IS31FL3196_REG_CNT (IS31FL3196_RESET + 1) 66 67 #define IS31FL319X_MAX_LEDS 9 68 69 /* CS (Current Setting) in CONFIG2 register */ 70 #define IS31FL3196_CONFIG2_CS_SHIFT 4 71 #define IS31FL3196_CONFIG2_CS_MASK GENMASK(2, 0) 72 #define IS31FL3196_CONFIG2_CS_STEP_REF 12 73 74 #define IS31FL3196_CURRENT_uA_MIN 5000 75 #define IS31FL3196_CURRENT_uA_MAX 40000 76 #define IS31FL3196_CURRENT_uA_STEP 5000 77 #define IS31FL3196_CURRENT_uA_DEFAULT 20000 78 79 /* Audio gain in CONFIG2 register */ 80 #define IS31FL3196_AUDIO_GAIN_DB_MAX ((u32)21) 81 #define IS31FL3196_AUDIO_GAIN_DB_STEP 3 82 83 /* 84 * regmap is used as a cache of chip's register space, 85 * to avoid reading back brightness values from chip, 86 * which is known to hang. 87 */ 88 struct is31fl319x_chip { 89 const struct is31fl319x_chipdef *cdef; 90 struct i2c_client *client; 91 struct gpio_desc *shutdown_gpio; 92 struct regmap *regmap; 93 struct mutex lock; 94 u32 audio_gain_db; 95 96 struct is31fl319x_led { 97 struct is31fl319x_chip *chip; 98 struct led_classdev cdev; 99 u32 max_microamp; 100 bool configured; 101 } leds[IS31FL319X_MAX_LEDS]; 102 }; 103 104 struct is31fl319x_chipdef { 105 int num_leds; 106 u8 reset_reg; 107 const struct regmap_config *is31fl319x_regmap_config; 108 int (*brightness_set)(struct led_classdev *cdev, enum led_brightness brightness); 109 u32 current_default; 110 u32 current_min; 111 u32 current_max; 112 bool is_3196or3199; 113 }; 114 115 static bool is31fl319x_readable_reg(struct device *dev, unsigned int reg) 116 { 117 /* we have no readable registers */ 118 return false; 119 } 120 121 static bool is31fl3190_volatile_reg(struct device *dev, unsigned int reg) 122 { 123 /* volatile registers are not cached */ 124 switch (reg) { 125 case IS31FL3190_DATA_UPDATE: 126 case IS31FL3190_TIME_UPDATE: 127 case IS31FL3190_RESET: 128 return true; /* always write-through */ 129 default: 130 return false; 131 } 132 } 133 134 static const struct reg_default is31fl3190_reg_defaults[] = { 135 { IS31FL3190_LEDMODE, 0x00 }, 136 { IS31FL3190_CURRENT, 0x00 }, 137 { IS31FL3190_PWM(0), 0x00 }, 138 { IS31FL3190_PWM(1), 0x00 }, 139 { IS31FL3190_PWM(2), 0x00 }, 140 }; 141 142 static struct regmap_config is31fl3190_regmap_config = { 143 .reg_bits = 8, 144 .val_bits = 8, 145 .max_register = IS31FL3190_RESET, 146 .cache_type = REGCACHE_FLAT, 147 .readable_reg = is31fl319x_readable_reg, 148 .volatile_reg = is31fl3190_volatile_reg, 149 .reg_defaults = is31fl3190_reg_defaults, 150 .num_reg_defaults = ARRAY_SIZE(is31fl3190_reg_defaults), 151 }; 152 153 static bool is31fl3196_volatile_reg(struct device *dev, unsigned int reg) 154 { 155 /* volatile registers are not cached */ 156 switch (reg) { 157 case IS31FL3196_DATA_UPDATE: 158 case IS31FL3196_TIME_UPDATE: 159 case IS31FL3196_RESET: 160 return true; /* always write-through */ 161 default: 162 return false; 163 } 164 } 165 166 static const struct reg_default is31fl3196_reg_defaults[] = { 167 { IS31FL3196_CONFIG1, 0x00 }, 168 { IS31FL3196_CONFIG2, 0x00 }, 169 { IS31FL3196_PWM(0), 0x00 }, 170 { IS31FL3196_PWM(1), 0x00 }, 171 { IS31FL3196_PWM(2), 0x00 }, 172 { IS31FL3196_PWM(3), 0x00 }, 173 { IS31FL3196_PWM(4), 0x00 }, 174 { IS31FL3196_PWM(5), 0x00 }, 175 { IS31FL3196_PWM(6), 0x00 }, 176 { IS31FL3196_PWM(7), 0x00 }, 177 { IS31FL3196_PWM(8), 0x00 }, 178 }; 179 180 static struct regmap_config is31fl3196_regmap_config = { 181 .reg_bits = 8, 182 .val_bits = 8, 183 .max_register = IS31FL3196_REG_CNT, 184 .cache_type = REGCACHE_FLAT, 185 .readable_reg = is31fl319x_readable_reg, 186 .volatile_reg = is31fl3196_volatile_reg, 187 .reg_defaults = is31fl3196_reg_defaults, 188 .num_reg_defaults = ARRAY_SIZE(is31fl3196_reg_defaults), 189 }; 190 191 static int is31fl3190_brightness_set(struct led_classdev *cdev, 192 enum led_brightness brightness) 193 { 194 struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led, cdev); 195 struct is31fl319x_chip *is31 = led->chip; 196 int chan = led - is31->leds; 197 int ret; 198 int i; 199 u8 ctrl = 0; 200 201 dev_dbg(&is31->client->dev, "channel %d: %d\n", chan, brightness); 202 203 mutex_lock(&is31->lock); 204 205 /* update PWM register */ 206 ret = regmap_write(is31->regmap, IS31FL3190_PWM(chan), brightness); 207 if (ret < 0) 208 goto out; 209 210 /* read current brightness of all PWM channels */ 211 for (i = 0; i < is31->cdef->num_leds; i++) { 212 unsigned int pwm_value; 213 bool on; 214 215 /* 216 * since neither cdev nor the chip can provide 217 * the current setting, we read from the regmap cache 218 */ 219 220 ret = regmap_read(is31->regmap, IS31FL3190_PWM(i), &pwm_value); 221 on = ret >= 0 && pwm_value > LED_OFF; 222 223 ctrl |= on << i; 224 } 225 226 if (ctrl > 0) { 227 dev_dbg(&is31->client->dev, "power up %02x\n", ctrl); 228 regmap_write(is31->regmap, IS31FL3190_LEDCONTROL, ctrl); 229 /* update PWMs */ 230 regmap_write(is31->regmap, IS31FL3190_DATA_UPDATE, 0x00); 231 /* enable chip from shut down and enable all channels */ 232 ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x20); 233 } else { 234 dev_dbg(&is31->client->dev, "power down\n"); 235 /* shut down (no need to clear LEDCONTROL) */ 236 ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01); 237 } 238 239 out: 240 mutex_unlock(&is31->lock); 241 242 return ret; 243 } 244 245 static int is31fl3196_brightness_set(struct led_classdev *cdev, 246 enum led_brightness brightness) 247 { 248 struct is31fl319x_led *led = container_of(cdev, struct is31fl319x_led, cdev); 249 struct is31fl319x_chip *is31 = led->chip; 250 int chan = led - is31->leds; 251 int ret; 252 int i; 253 u8 ctrl1 = 0, ctrl2 = 0; 254 255 dev_dbg(&is31->client->dev, "channel %d: %d\n", chan, brightness); 256 257 mutex_lock(&is31->lock); 258 259 /* update PWM register */ 260 ret = regmap_write(is31->regmap, IS31FL3196_PWM(chan), brightness); 261 if (ret < 0) 262 goto out; 263 264 /* read current brightness of all PWM channels */ 265 for (i = 0; i < is31->cdef->num_leds; i++) { 266 unsigned int pwm_value; 267 bool on; 268 269 /* 270 * since neither cdev nor the chip can provide 271 * the current setting, we read from the regmap cache 272 */ 273 274 ret = regmap_read(is31->regmap, IS31FL3196_PWM(i), &pwm_value); 275 on = ret >= 0 && pwm_value > LED_OFF; 276 277 if (i < 3) 278 ctrl1 |= on << i; /* 0..2 => bit 0..2 */ 279 else if (i < 6) 280 ctrl1 |= on << (i + 1); /* 3..5 => bit 4..6 */ 281 else 282 ctrl2 |= on << (i - 6); /* 6..8 => bit 0..2 */ 283 } 284 285 if (ctrl1 > 0 || ctrl2 > 0) { 286 dev_dbg(&is31->client->dev, "power up %02x %02x\n", 287 ctrl1, ctrl2); 288 regmap_write(is31->regmap, IS31FL3196_CTRL1, ctrl1); 289 regmap_write(is31->regmap, IS31FL3196_CTRL2, ctrl2); 290 /* update PWMs */ 291 regmap_write(is31->regmap, IS31FL3196_DATA_UPDATE, 0x00); 292 /* enable chip from shut down */ 293 ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x01); 294 } else { 295 dev_dbg(&is31->client->dev, "power down\n"); 296 /* shut down (no need to clear CTRL1/2) */ 297 ret = regmap_write(is31->regmap, IS31FL319X_SHUTDOWN, 0x00); 298 } 299 300 out: 301 mutex_unlock(&is31->lock); 302 303 return ret; 304 } 305 306 static const struct is31fl319x_chipdef is31fl3190_cdef = { 307 .num_leds = 1, 308 .reset_reg = IS31FL3190_RESET, 309 .is31fl319x_regmap_config = &is31fl3190_regmap_config, 310 .brightness_set = is31fl3190_brightness_set, 311 .current_default = IS31FL3190_CURRENT_uA_DEFAULT, 312 .current_min = IS31FL3190_CURRENT_uA_MIN, 313 .current_max = IS31FL3190_CURRENT_uA_MAX, 314 .is_3196or3199 = false, 315 }; 316 317 static const struct is31fl319x_chipdef is31fl3193_cdef = { 318 .num_leds = 3, 319 .reset_reg = IS31FL3190_RESET, 320 .is31fl319x_regmap_config = &is31fl3190_regmap_config, 321 .brightness_set = is31fl3190_brightness_set, 322 .current_default = IS31FL3190_CURRENT_uA_DEFAULT, 323 .current_min = IS31FL3190_CURRENT_uA_MIN, 324 .current_max = IS31FL3190_CURRENT_uA_MAX, 325 .is_3196or3199 = false, 326 }; 327 328 static const struct is31fl319x_chipdef is31fl3196_cdef = { 329 .num_leds = 6, 330 .reset_reg = IS31FL3196_RESET, 331 .is31fl319x_regmap_config = &is31fl3196_regmap_config, 332 .brightness_set = is31fl3196_brightness_set, 333 .current_default = IS31FL3196_CURRENT_uA_DEFAULT, 334 .current_min = IS31FL3196_CURRENT_uA_MIN, 335 .current_max = IS31FL3196_CURRENT_uA_MAX, 336 .is_3196or3199 = true, 337 }; 338 339 static const struct is31fl319x_chipdef is31fl3199_cdef = { 340 .num_leds = 9, 341 .reset_reg = IS31FL3196_RESET, 342 .is31fl319x_regmap_config = &is31fl3196_regmap_config, 343 .brightness_set = is31fl3196_brightness_set, 344 .current_default = IS31FL3196_CURRENT_uA_DEFAULT, 345 .current_min = IS31FL3196_CURRENT_uA_MIN, 346 .current_max = IS31FL3196_CURRENT_uA_MAX, 347 .is_3196or3199 = true, 348 }; 349 350 static const struct of_device_id of_is31fl319x_match[] = { 351 { .compatible = "issi,is31fl3190", .data = &is31fl3190_cdef, }, 352 { .compatible = "issi,is31fl3191", .data = &is31fl3190_cdef, }, 353 { .compatible = "issi,is31fl3193", .data = &is31fl3193_cdef, }, 354 { .compatible = "issi,is31fl3196", .data = &is31fl3196_cdef, }, 355 { .compatible = "issi,is31fl3199", .data = &is31fl3199_cdef, }, 356 { .compatible = "si-en,sn3190", .data = &is31fl3190_cdef, }, 357 { .compatible = "si-en,sn3191", .data = &is31fl3190_cdef, }, 358 { .compatible = "si-en,sn3193", .data = &is31fl3193_cdef, }, 359 { .compatible = "si-en,sn3196", .data = &is31fl3196_cdef, }, 360 { .compatible = "si-en,sn3199", .data = &is31fl3199_cdef, }, 361 { } 362 }; 363 MODULE_DEVICE_TABLE(of, of_is31fl319x_match); 364 365 static int is31fl319x_parse_child_fw(const struct device *dev, 366 const struct fwnode_handle *child, 367 struct is31fl319x_led *led, 368 struct is31fl319x_chip *is31) 369 { 370 struct led_classdev *cdev = &led->cdev; 371 int ret; 372 373 if (fwnode_property_read_string(child, "label", &cdev->name)) 374 cdev->name = fwnode_get_name(child); 375 376 ret = fwnode_property_read_string(child, "linux,default-trigger", &cdev->default_trigger); 377 if (ret < 0 && ret != -EINVAL) /* is optional */ 378 return ret; 379 380 led->max_microamp = is31->cdef->current_default; 381 ret = fwnode_property_read_u32(child, "led-max-microamp", &led->max_microamp); 382 if (!ret) { 383 if (led->max_microamp < is31->cdef->current_min) 384 return -EINVAL; /* not supported */ 385 led->max_microamp = min(led->max_microamp, 386 is31->cdef->current_max); 387 } 388 389 return 0; 390 } 391 392 static int is31fl319x_parse_fw(struct device *dev, struct is31fl319x_chip *is31) 393 { 394 struct fwnode_handle *fwnode = dev_fwnode(dev), *child; 395 int count; 396 int ret; 397 398 is31->shutdown_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH); 399 if (IS_ERR(is31->shutdown_gpio)) 400 return dev_err_probe(dev, PTR_ERR(is31->shutdown_gpio), 401 "Failed to get shutdown gpio\n"); 402 403 is31->cdef = device_get_match_data(dev); 404 405 count = 0; 406 fwnode_for_each_available_child_node(fwnode, child) 407 count++; 408 409 dev_dbg(dev, "probing with %d leds defined in DT\n", count); 410 411 if (!count || count > is31->cdef->num_leds) 412 return dev_err_probe(dev, -ENODEV, 413 "Number of leds defined must be between 1 and %u\n", 414 is31->cdef->num_leds); 415 416 fwnode_for_each_available_child_node(fwnode, child) { 417 struct is31fl319x_led *led; 418 u32 reg; 419 420 ret = fwnode_property_read_u32(child, "reg", ®); 421 if (ret) { 422 ret = dev_err_probe(dev, ret, "Failed to read led 'reg' property\n"); 423 goto put_child_node; 424 } 425 426 if (reg < 1 || reg > is31->cdef->num_leds) { 427 ret = dev_err_probe(dev, -EINVAL, "invalid led reg %u\n", reg); 428 goto put_child_node; 429 } 430 431 led = &is31->leds[reg - 1]; 432 433 if (led->configured) { 434 ret = dev_err_probe(dev, -EINVAL, "led %u is already configured\n", reg); 435 goto put_child_node; 436 } 437 438 ret = is31fl319x_parse_child_fw(dev, child, led, is31); 439 if (ret) { 440 ret = dev_err_probe(dev, ret, "led %u DT parsing failed\n", reg); 441 goto put_child_node; 442 } 443 444 led->configured = true; 445 } 446 447 is31->audio_gain_db = 0; 448 if (is31->cdef->is_3196or3199) { 449 ret = fwnode_property_read_u32(fwnode, "audio-gain-db", &is31->audio_gain_db); 450 if (!ret) 451 is31->audio_gain_db = min(is31->audio_gain_db, 452 IS31FL3196_AUDIO_GAIN_DB_MAX); 453 } 454 455 return 0; 456 457 put_child_node: 458 fwnode_handle_put(child); 459 return ret; 460 } 461 462 static inline int is31fl3190_microamp_to_cs(struct device *dev, u32 microamp) 463 { 464 switch (microamp) { 465 case 5000: 466 return IS31FL3190_CURRENT_5_mA; 467 case 10000: 468 return IS31FL3190_CURRENT_10_mA; 469 case 17500: 470 return IS31FL3190_CURRENT_17dot5_mA; 471 case 30000: 472 return IS31FL3190_CURRENT_30_mA; 473 case 42000: 474 return IS31FL3190_CURRENT_42_mA; 475 default: 476 dev_warn(dev, "Unsupported current value: %d, using 5000 µA!\n", microamp); 477 return IS31FL3190_CURRENT_5_mA; 478 } 479 } 480 481 static inline int is31fl3196_microamp_to_cs(struct device *dev, u32 microamp) 482 { 483 /* round down to nearest supported value (range check done by caller) */ 484 u32 step = microamp / IS31FL3196_CURRENT_uA_STEP; 485 486 return ((IS31FL3196_CONFIG2_CS_STEP_REF - step) & 487 IS31FL3196_CONFIG2_CS_MASK) << 488 IS31FL3196_CONFIG2_CS_SHIFT; /* CS encoding */ 489 } 490 491 static inline int is31fl3196_db_to_gain(u32 dezibel) 492 { 493 /* round down to nearest supported value (range check done by caller) */ 494 return dezibel / IS31FL3196_AUDIO_GAIN_DB_STEP; 495 } 496 497 static int is31fl319x_probe(struct i2c_client *client) 498 { 499 struct is31fl319x_chip *is31; 500 struct device *dev = &client->dev; 501 int err; 502 int i = 0; 503 u32 aggregated_led_microamp; 504 505 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 506 return -EIO; 507 508 is31 = devm_kzalloc(&client->dev, sizeof(*is31), GFP_KERNEL); 509 if (!is31) 510 return -ENOMEM; 511 512 mutex_init(&is31->lock); 513 err = devm_add_action(dev, (void (*)(void *))mutex_destroy, &is31->lock); 514 if (err) 515 return err; 516 517 err = is31fl319x_parse_fw(&client->dev, is31); 518 if (err) 519 return err; 520 521 if (is31->shutdown_gpio) { 522 gpiod_direction_output(is31->shutdown_gpio, 0); 523 mdelay(5); 524 gpiod_direction_output(is31->shutdown_gpio, 1); 525 } 526 527 is31->client = client; 528 is31->regmap = devm_regmap_init_i2c(client, is31->cdef->is31fl319x_regmap_config); 529 if (IS_ERR(is31->regmap)) 530 return dev_err_probe(dev, PTR_ERR(is31->regmap), "failed to allocate register map\n"); 531 532 i2c_set_clientdata(client, is31); 533 534 /* check for write-reply from chip (we can't read any registers) */ 535 err = regmap_write(is31->regmap, is31->cdef->reset_reg, 0x00); 536 if (err < 0) 537 return dev_err_probe(dev, err, "no response from chip write\n"); 538 539 /* 540 * Kernel conventions require per-LED led-max-microamp property. 541 * But the chip does not allow to limit individual LEDs. 542 * So we take minimum from all subnodes for safety of hardware. 543 */ 544 aggregated_led_microamp = is31->cdef->current_max; 545 for (i = 0; i < is31->cdef->num_leds; i++) 546 if (is31->leds[i].configured && 547 is31->leds[i].max_microamp < aggregated_led_microamp) 548 aggregated_led_microamp = is31->leds[i].max_microamp; 549 550 if (is31->cdef->is_3196or3199) 551 regmap_write(is31->regmap, IS31FL3196_CONFIG2, 552 is31fl3196_microamp_to_cs(dev, aggregated_led_microamp) | 553 is31fl3196_db_to_gain(is31->audio_gain_db)); 554 else 555 regmap_update_bits(is31->regmap, IS31FL3190_CURRENT, IS31FL3190_CURRENT_MASK, 556 is31fl3190_microamp_to_cs(dev, aggregated_led_microamp)); 557 558 for (i = 0; i < is31->cdef->num_leds; i++) { 559 struct is31fl319x_led *led = &is31->leds[i]; 560 561 if (!led->configured) 562 continue; 563 564 led->chip = is31; 565 led->cdev.brightness_set_blocking = is31->cdef->brightness_set; 566 567 err = devm_led_classdev_register(&client->dev, &led->cdev); 568 if (err < 0) 569 return err; 570 } 571 572 return 0; 573 } 574 575 /* 576 * i2c-core (and modalias) requires that id_table be properly filled, 577 * even though it is not used for DeviceTree based instantiation. 578 */ 579 static const struct i2c_device_id is31fl319x_id[] = { 580 { "is31fl3190" }, 581 { "is31fl3191" }, 582 { "is31fl3193" }, 583 { "is31fl3196" }, 584 { "is31fl3199" }, 585 { "sn3190" }, 586 { "sn3191" }, 587 { "sn3193" }, 588 { "sn3196" }, 589 { "sn3199" }, 590 {}, 591 }; 592 MODULE_DEVICE_TABLE(i2c, is31fl319x_id); 593 594 static struct i2c_driver is31fl319x_driver = { 595 .driver = { 596 .name = "leds-is31fl319x", 597 .of_match_table = of_is31fl319x_match, 598 }, 599 .probe_new = is31fl319x_probe, 600 .id_table = is31fl319x_id, 601 }; 602 603 module_i2c_driver(is31fl319x_driver); 604 605 MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>"); 606 MODULE_AUTHOR("Andrey Utkin <andrey_utkin@fastmail.com>"); 607 MODULE_DESCRIPTION("IS31FL319X LED driver"); 608 MODULE_LICENSE("GPL v2"); 609