linux/drivers/leds/leds-lp5521.c
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   1/*
   2 * LP5521 LED chip driver.
   3 *
   4 * Copyright (C) 2010 Nokia Corporation
   5 * Copyright (C) 2012 Texas Instruments
   6 *
   7 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   8 *          Milo(Woogyom) Kim <milo.kim@ti.com>
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License
  12 * version 2 as published by the Free Software Foundation.
  13 *
  14 * This program is distributed in the hope that it will be useful, but
  15 * WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 * General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22 * 02110-1301 USA
  23 */
  24
  25#include <linux/delay.h>
  26#include <linux/firmware.h>
  27#include <linux/i2c.h>
  28#include <linux/leds.h>
  29#include <linux/module.h>
  30#include <linux/mutex.h>
  31#include <linux/platform_data/leds-lp55xx.h>
  32#include <linux/slab.h>
  33#include <linux/of.h>
  34
  35#include "leds-lp55xx-common.h"
  36
  37#define LP5521_PROGRAM_LENGTH           32
  38#define LP5521_MAX_LEDS                 3
  39#define LP5521_CMD_DIRECT               0x3F
  40
  41/* Registers */
  42#define LP5521_REG_ENABLE               0x00
  43#define LP5521_REG_OP_MODE              0x01
  44#define LP5521_REG_R_PWM                0x02
  45#define LP5521_REG_G_PWM                0x03
  46#define LP5521_REG_B_PWM                0x04
  47#define LP5521_REG_R_CURRENT            0x05
  48#define LP5521_REG_G_CURRENT            0x06
  49#define LP5521_REG_B_CURRENT            0x07
  50#define LP5521_REG_CONFIG               0x08
  51#define LP5521_REG_STATUS               0x0C
  52#define LP5521_REG_RESET                0x0D
  53#define LP5521_REG_R_PROG_MEM           0x10
  54#define LP5521_REG_G_PROG_MEM           0x30
  55#define LP5521_REG_B_PROG_MEM           0x50
  56
  57/* Base register to set LED current */
  58#define LP5521_REG_LED_CURRENT_BASE     LP5521_REG_R_CURRENT
  59/* Base register to set the brightness */
  60#define LP5521_REG_LED_PWM_BASE         LP5521_REG_R_PWM
  61
  62/* Bits in ENABLE register */
  63#define LP5521_MASTER_ENABLE            0x40    /* Chip master enable */
  64#define LP5521_LOGARITHMIC_PWM          0x80    /* Logarithmic PWM adjustment */
  65#define LP5521_EXEC_RUN                 0x2A
  66#define LP5521_ENABLE_DEFAULT   \
  67        (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
  68#define LP5521_ENABLE_RUN_PROGRAM       \
  69        (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
  70
  71/* CONFIG register */
  72#define LP5521_PWM_HF                   0x40    /* PWM: 0 = 256Hz, 1 = 558Hz */
  73#define LP5521_PWRSAVE_EN               0x20    /* 1 = Power save mode */
  74#define LP5521_CP_MODE_OFF              0       /* Charge pump (CP) off */
  75#define LP5521_CP_MODE_BYPASS           8       /* CP forced to bypass mode */
  76#define LP5521_CP_MODE_1X5              0x10    /* CP forced to 1.5x mode */
  77#define LP5521_CP_MODE_AUTO             0x18    /* Automatic mode selection */
  78#define LP5521_R_TO_BATT                0x04    /* R out: 0 = CP, 1 = Vbat */
  79#define LP5521_CLK_INT                  0x01    /* Internal clock */
  80#define LP5521_DEFAULT_CFG              \
  81        (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
  82
  83/* Status */
  84#define LP5521_EXT_CLK_USED             0x08
  85
  86/* default R channel current register value */
  87#define LP5521_REG_R_CURR_DEFAULT       0xAF
  88
  89/* Reset register value */
  90#define LP5521_RESET                    0xFF
  91
  92/* Program Memory Operations */
  93#define LP5521_MODE_R_M                 0x30    /* Operation Mode Register */
  94#define LP5521_MODE_G_M                 0x0C
  95#define LP5521_MODE_B_M                 0x03
  96#define LP5521_LOAD_R                   0x10
  97#define LP5521_LOAD_G                   0x04
  98#define LP5521_LOAD_B                   0x01
  99
 100#define LP5521_R_IS_LOADING(mode)       \
 101        ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
 102#define LP5521_G_IS_LOADING(mode)       \
 103        ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
 104#define LP5521_B_IS_LOADING(mode)       \
 105        ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
 106
 107#define LP5521_EXEC_R_M                 0x30    /* Enable Register */
 108#define LP5521_EXEC_G_M                 0x0C
 109#define LP5521_EXEC_B_M                 0x03
 110#define LP5521_EXEC_M                   0x3F
 111#define LP5521_RUN_R                    0x20
 112#define LP5521_RUN_G                    0x08
 113#define LP5521_RUN_B                    0x02
 114
 115static inline void lp5521_wait_opmode_done(void)
 116{
 117        /* operation mode change needs to be longer than 153 us */
 118        usleep_range(200, 300);
 119}
 120
 121static inline void lp5521_wait_enable_done(void)
 122{
 123        /* it takes more 488 us to update ENABLE register */
 124        usleep_range(500, 600);
 125}
 126
 127static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
 128{
 129        led->led_current = led_current;
 130        lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
 131                led_current);
 132}
 133
 134static void lp5521_load_engine(struct lp55xx_chip *chip)
 135{
 136        enum lp55xx_engine_index idx = chip->engine_idx;
 137        static const u8 mask[] = {
 138                [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 139                [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 140                [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 141        };
 142
 143        static const u8 val[] = {
 144                [LP55XX_ENGINE_1] = LP5521_LOAD_R,
 145                [LP55XX_ENGINE_2] = LP5521_LOAD_G,
 146                [LP55XX_ENGINE_3] = LP5521_LOAD_B,
 147        };
 148
 149        lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
 150
 151        lp5521_wait_opmode_done();
 152}
 153
 154static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
 155{
 156        lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
 157        lp5521_wait_opmode_done();
 158}
 159
 160static void lp5521_stop_engine(struct lp55xx_chip *chip)
 161{
 162        enum lp55xx_engine_index idx = chip->engine_idx;
 163        static const u8 mask[] = {
 164                [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 165                [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 166                [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 167        };
 168
 169        lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
 170
 171        lp5521_wait_opmode_done();
 172}
 173
 174static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
 175{
 176        int ret;
 177        u8 mode;
 178        u8 exec;
 179
 180        /* stop engine */
 181        if (!start) {
 182                lp5521_stop_engine(chip);
 183                lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 184                lp5521_wait_opmode_done();
 185                return;
 186        }
 187
 188        /*
 189         * To run the engine,
 190         * operation mode and enable register should updated at the same time
 191         */
 192
 193        ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
 194        if (ret)
 195                return;
 196
 197        ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
 198        if (ret)
 199                return;
 200
 201        /* change operation mode to RUN only when each engine is loading */
 202        if (LP5521_R_IS_LOADING(mode)) {
 203                mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
 204                exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
 205        }
 206
 207        if (LP5521_G_IS_LOADING(mode)) {
 208                mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
 209                exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
 210        }
 211
 212        if (LP5521_B_IS_LOADING(mode)) {
 213                mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
 214                exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
 215        }
 216
 217        lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
 218        lp5521_wait_opmode_done();
 219
 220        lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
 221        lp5521_wait_enable_done();
 222}
 223
 224static int lp5521_update_program_memory(struct lp55xx_chip *chip,
 225                                        const u8 *data, size_t size)
 226{
 227        enum lp55xx_engine_index idx = chip->engine_idx;
 228        u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
 229        static const u8 addr[] = {
 230                [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
 231                [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
 232                [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
 233        };
 234        unsigned cmd;
 235        char c[3];
 236        int nrchars;
 237        int ret;
 238        int offset = 0;
 239        int i = 0;
 240
 241        while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
 242                /* separate sscanfs because length is working only for %s */
 243                ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 244                if (ret != 1)
 245                        goto err;
 246
 247                ret = sscanf(c, "%2x", &cmd);
 248                if (ret != 1)
 249                        goto err;
 250
 251                pattern[i] = (u8)cmd;
 252                offset += nrchars;
 253                i++;
 254        }
 255
 256        /* Each instruction is 16bit long. Check that length is even */
 257        if (i % 2)
 258                goto err;
 259
 260        for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
 261                ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
 262                if (ret)
 263                        return -EINVAL;
 264        }
 265
 266        return size;
 267
 268err:
 269        dev_err(&chip->cl->dev, "wrong pattern format\n");
 270        return -EINVAL;
 271}
 272
 273static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
 274{
 275        const struct firmware *fw = chip->fw;
 276
 277        if (fw->size > LP5521_PROGRAM_LENGTH) {
 278                dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 279                        fw->size);
 280                return;
 281        }
 282
 283        /*
 284         * Program memory sequence
 285         *  1) set engine mode to "LOAD"
 286         *  2) write firmware data into program memory
 287         */
 288
 289        lp5521_load_engine(chip);
 290        lp5521_update_program_memory(chip, fw->data, fw->size);
 291}
 292
 293static int lp5521_post_init_device(struct lp55xx_chip *chip)
 294{
 295        int ret;
 296        u8 val;
 297
 298        /*
 299         * Make sure that the chip is reset by reading back the r channel
 300         * current reg. This is dummy read is required on some platforms -
 301         * otherwise further access to the R G B channels in the
 302         * LP5521_REG_ENABLE register will not have any effect - strange!
 303         */
 304        ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
 305        if (ret) {
 306                dev_err(&chip->cl->dev, "error in resetting chip\n");
 307                return ret;
 308        }
 309        if (val != LP5521_REG_R_CURR_DEFAULT) {
 310                dev_err(&chip->cl->dev,
 311                        "unexpected data in register (expected 0x%x got 0x%x)\n",
 312                        LP5521_REG_R_CURR_DEFAULT, val);
 313                ret = -EINVAL;
 314                return ret;
 315        }
 316        usleep_range(10000, 20000);
 317
 318        /* Set all PWMs to direct control mode */
 319        ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 320
 321        /* Update configuration for the clock setting */
 322        val = LP5521_DEFAULT_CFG;
 323        if (!lp55xx_is_extclk_used(chip))
 324                val |= LP5521_CLK_INT;
 325
 326        ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
 327        if (ret)
 328                return ret;
 329
 330        /* Initialize all channels PWM to zero -> leds off */
 331        lp55xx_write(chip, LP5521_REG_R_PWM, 0);
 332        lp55xx_write(chip, LP5521_REG_G_PWM, 0);
 333        lp55xx_write(chip, LP5521_REG_B_PWM, 0);
 334
 335        /* Set engines are set to run state when OP_MODE enables engines */
 336        ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
 337        if (ret)
 338                return ret;
 339
 340        lp5521_wait_enable_done();
 341
 342        return 0;
 343}
 344
 345static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
 346{
 347        struct lp55xx_platform_data *pdata = chip->pdata;
 348        int ret;
 349        u8 status;
 350
 351        ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
 352        if (ret < 0)
 353                return ret;
 354
 355        if (pdata->clock_mode != LP55XX_CLOCK_EXT)
 356                return 0;
 357
 358        /* Check that ext clock is really in use if requested */
 359        if  ((status & LP5521_EXT_CLK_USED) == 0)
 360                return -EIO;
 361
 362        return 0;
 363}
 364
 365static int lp5521_led_brightness(struct lp55xx_led *led)
 366{
 367        struct lp55xx_chip *chip = led->chip;
 368        int ret;
 369
 370        mutex_lock(&chip->lock);
 371        ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
 372                led->brightness);
 373        mutex_unlock(&chip->lock);
 374
 375        return ret;
 376}
 377
 378static ssize_t show_engine_mode(struct device *dev,
 379                                struct device_attribute *attr,
 380                                char *buf, int nr)
 381{
 382        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 383        struct lp55xx_chip *chip = led->chip;
 384        enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 385
 386        switch (mode) {
 387        case LP55XX_ENGINE_RUN:
 388                return sprintf(buf, "run\n");
 389        case LP55XX_ENGINE_LOAD:
 390                return sprintf(buf, "load\n");
 391        case LP55XX_ENGINE_DISABLED:
 392        default:
 393                return sprintf(buf, "disabled\n");
 394        }
 395}
 396show_mode(1)
 397show_mode(2)
 398show_mode(3)
 399
 400static ssize_t store_engine_mode(struct device *dev,
 401                                 struct device_attribute *attr,
 402                                 const char *buf, size_t len, int nr)
 403{
 404        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 405        struct lp55xx_chip *chip = led->chip;
 406        struct lp55xx_engine *engine = &chip->engines[nr - 1];
 407
 408        mutex_lock(&chip->lock);
 409
 410        chip->engine_idx = nr;
 411
 412        if (!strncmp(buf, "run", 3)) {
 413                lp5521_run_engine(chip, true);
 414                engine->mode = LP55XX_ENGINE_RUN;
 415        } else if (!strncmp(buf, "load", 4)) {
 416                lp5521_stop_engine(chip);
 417                lp5521_load_engine(chip);
 418                engine->mode = LP55XX_ENGINE_LOAD;
 419        } else if (!strncmp(buf, "disabled", 8)) {
 420                lp5521_stop_engine(chip);
 421                engine->mode = LP55XX_ENGINE_DISABLED;
 422        }
 423
 424        mutex_unlock(&chip->lock);
 425
 426        return len;
 427}
 428store_mode(1)
 429store_mode(2)
 430store_mode(3)
 431
 432static ssize_t store_engine_load(struct device *dev,
 433                             struct device_attribute *attr,
 434                             const char *buf, size_t len, int nr)
 435{
 436        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 437        struct lp55xx_chip *chip = led->chip;
 438        int ret;
 439
 440        mutex_lock(&chip->lock);
 441
 442        chip->engine_idx = nr;
 443        lp5521_load_engine(chip);
 444        ret = lp5521_update_program_memory(chip, buf, len);
 445
 446        mutex_unlock(&chip->lock);
 447
 448        return ret;
 449}
 450store_load(1)
 451store_load(2)
 452store_load(3)
 453
 454static ssize_t lp5521_selftest(struct device *dev,
 455                               struct device_attribute *attr,
 456                               char *buf)
 457{
 458        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 459        struct lp55xx_chip *chip = led->chip;
 460        int ret;
 461
 462        mutex_lock(&chip->lock);
 463        ret = lp5521_run_selftest(chip, buf);
 464        mutex_unlock(&chip->lock);
 465
 466        return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
 467}
 468
 469/* device attributes */
 470static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 471static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 472static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 473static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 474static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 475static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 476static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
 477
 478static struct attribute *lp5521_attributes[] = {
 479        &dev_attr_engine1_mode.attr,
 480        &dev_attr_engine2_mode.attr,
 481        &dev_attr_engine3_mode.attr,
 482        &dev_attr_engine1_load.attr,
 483        &dev_attr_engine2_load.attr,
 484        &dev_attr_engine3_load.attr,
 485        &dev_attr_selftest.attr,
 486        NULL
 487};
 488
 489static const struct attribute_group lp5521_group = {
 490        .attrs = lp5521_attributes,
 491};
 492
 493/* Chip specific configurations */
 494static struct lp55xx_device_config lp5521_cfg = {
 495        .reset = {
 496                .addr = LP5521_REG_RESET,
 497                .val  = LP5521_RESET,
 498        },
 499        .enable = {
 500                .addr = LP5521_REG_ENABLE,
 501                .val  = LP5521_ENABLE_DEFAULT,
 502        },
 503        .max_channel  = LP5521_MAX_LEDS,
 504        .post_init_device   = lp5521_post_init_device,
 505        .brightness_fn      = lp5521_led_brightness,
 506        .set_led_current    = lp5521_set_led_current,
 507        .firmware_cb        = lp5521_firmware_loaded,
 508        .run_engine         = lp5521_run_engine,
 509        .dev_attr_group     = &lp5521_group,
 510};
 511
 512static int lp5521_probe(struct i2c_client *client,
 513                        const struct i2c_device_id *id)
 514{
 515        int ret;
 516        struct lp55xx_chip *chip;
 517        struct lp55xx_led *led;
 518        struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 519        struct device_node *np = client->dev.of_node;
 520
 521        if (!pdata) {
 522                if (np) {
 523                        pdata = lp55xx_of_populate_pdata(&client->dev, np);
 524                        if (IS_ERR(pdata))
 525                                return PTR_ERR(pdata);
 526                } else {
 527                        dev_err(&client->dev, "no platform data\n");
 528                        return -EINVAL;
 529                }
 530        }
 531
 532        chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 533        if (!chip)
 534                return -ENOMEM;
 535
 536        led = devm_kcalloc(&client->dev,
 537                        pdata->num_channels, sizeof(*led), GFP_KERNEL);
 538        if (!led)
 539                return -ENOMEM;
 540
 541        chip->cl = client;
 542        chip->pdata = pdata;
 543        chip->cfg = &lp5521_cfg;
 544
 545        mutex_init(&chip->lock);
 546
 547        i2c_set_clientdata(client, led);
 548
 549        ret = lp55xx_init_device(chip);
 550        if (ret)
 551                goto err_init;
 552
 553        dev_info(&client->dev, "%s programmable led chip found\n", id->name);
 554
 555        ret = lp55xx_register_leds(led, chip);
 556        if (ret)
 557                goto err_register_leds;
 558
 559        ret = lp55xx_register_sysfs(chip);
 560        if (ret) {
 561                dev_err(&client->dev, "registering sysfs failed\n");
 562                goto err_register_sysfs;
 563        }
 564
 565        return 0;
 566
 567err_register_sysfs:
 568        lp55xx_unregister_leds(led, chip);
 569err_register_leds:
 570        lp55xx_deinit_device(chip);
 571err_init:
 572        return ret;
 573}
 574
 575static int lp5521_remove(struct i2c_client *client)
 576{
 577        struct lp55xx_led *led = i2c_get_clientdata(client);
 578        struct lp55xx_chip *chip = led->chip;
 579
 580        lp5521_stop_all_engines(chip);
 581        lp55xx_unregister_sysfs(chip);
 582        lp55xx_unregister_leds(led, chip);
 583        lp55xx_deinit_device(chip);
 584
 585        return 0;
 586}
 587
 588static const struct i2c_device_id lp5521_id[] = {
 589        { "lp5521", 0 }, /* Three channel chip */
 590        { }
 591};
 592MODULE_DEVICE_TABLE(i2c, lp5521_id);
 593
 594#ifdef CONFIG_OF
 595static const struct of_device_id of_lp5521_leds_match[] = {
 596        { .compatible = "national,lp5521", },
 597        {},
 598};
 599
 600MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
 601#endif
 602static struct i2c_driver lp5521_driver = {
 603        .driver = {
 604                .name   = "lp5521",
 605                .of_match_table = of_match_ptr(of_lp5521_leds_match),
 606        },
 607        .probe          = lp5521_probe,
 608        .remove         = lp5521_remove,
 609        .id_table       = lp5521_id,
 610};
 611
 612module_i2c_driver(lp5521_driver);
 613
 614MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
 615MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 616MODULE_DESCRIPTION("LP5521 LED engine");
 617MODULE_LICENSE("GPL v2");
 618