LXR linux/drivers/leds/leds-lp5521.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * LP5521 LED chip driver.
   4 *
   5 * Copyright (C) 2010 Nokia Corporation
   6 * Copyright (C) 2012 Texas Instruments
   7 *
   8 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   9 *          Milo(Woogyom) Kim <milo.kim@ti.com>
  10 */
  11
  12#include <linux/delay.h>
  13#include <linux/firmware.h>
  14#include <linux/i2c.h>
  15#include <linux/leds.h>
  16#include <linux/module.h>
  17#include <linux/mutex.h>
  18#include <linux/platform_data/leds-lp55xx.h>
  19#include <linux/slab.h>
  20#include <linux/of.h>
  21
  22#include "leds-lp55xx-common.h"
  23
  24#define LP5521_PROGRAM_LENGTH           32
  25#define LP5521_MAX_LEDS                 3
  26#define LP5521_CMD_DIRECT               0x3F
  27
  28/* Registers */
  29#define LP5521_REG_ENABLE               0x00
  30#define LP5521_REG_OP_MODE              0x01
  31#define LP5521_REG_R_PWM                0x02
  32#define LP5521_REG_G_PWM                0x03
  33#define LP5521_REG_B_PWM                0x04
  34#define LP5521_REG_R_CURRENT            0x05
  35#define LP5521_REG_G_CURRENT            0x06
  36#define LP5521_REG_B_CURRENT            0x07
  37#define LP5521_REG_CONFIG               0x08
  38#define LP5521_REG_STATUS               0x0C
  39#define LP5521_REG_RESET                0x0D
  40#define LP5521_REG_R_PROG_MEM           0x10
  41#define LP5521_REG_G_PROG_MEM           0x30
  42#define LP5521_REG_B_PROG_MEM           0x50
  43
  44/* Base register to set LED current */
  45#define LP5521_REG_LED_CURRENT_BASE     LP5521_REG_R_CURRENT
  46/* Base register to set the brightness */
  47#define LP5521_REG_LED_PWM_BASE         LP5521_REG_R_PWM
  48
  49/* Bits in ENABLE register */
  50#define LP5521_MASTER_ENABLE            0x40    /* Chip master enable */
  51#define LP5521_LOGARITHMIC_PWM          0x80    /* Logarithmic PWM adjustment */
  52#define LP5521_EXEC_RUN                 0x2A
  53#define LP5521_ENABLE_DEFAULT   \
  54        (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
  55#define LP5521_ENABLE_RUN_PROGRAM       \
  56        (LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
  57
  58/* CONFIG register */
  59#define LP5521_PWM_HF                   0x40    /* PWM: 0 = 256Hz, 1 = 558Hz */
  60#define LP5521_PWRSAVE_EN               0x20    /* 1 = Power save mode */
  61#define LP5521_CP_MODE_OFF              0       /* Charge pump (CP) off */
  62#define LP5521_CP_MODE_BYPASS           8       /* CP forced to bypass mode */
  63#define LP5521_CP_MODE_1X5              0x10    /* CP forced to 1.5x mode */
  64#define LP5521_CP_MODE_AUTO             0x18    /* Automatic mode selection */
  65#define LP5521_R_TO_BATT                0x04    /* R out: 0 = CP, 1 = Vbat */
  66#define LP5521_CLK_INT                  0x01    /* Internal clock */
  67#define LP5521_DEFAULT_CFG              \
  68        (LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
  69
  70/* Status */
  71#define LP5521_EXT_CLK_USED             0x08
  72
  73/* default R channel current register value */
  74#define LP5521_REG_R_CURR_DEFAULT       0xAF
  75
  76/* Reset register value */
  77#define LP5521_RESET                    0xFF
  78
  79/* Program Memory Operations */
  80#define LP5521_MODE_R_M                 0x30    /* Operation Mode Register */
  81#define LP5521_MODE_G_M                 0x0C
  82#define LP5521_MODE_B_M                 0x03
  83#define LP5521_LOAD_R                   0x10
  84#define LP5521_LOAD_G                   0x04
  85#define LP5521_LOAD_B                   0x01
  86
  87#define LP5521_R_IS_LOADING(mode)       \
  88        ((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
  89#define LP5521_G_IS_LOADING(mode)       \
  90        ((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
  91#define LP5521_B_IS_LOADING(mode)       \
  92        ((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
  93
  94#define LP5521_EXEC_R_M                 0x30    /* Enable Register */
  95#define LP5521_EXEC_G_M                 0x0C
  96#define LP5521_EXEC_B_M                 0x03
  97#define LP5521_EXEC_M                   0x3F
  98#define LP5521_RUN_R                    0x20
  99#define LP5521_RUN_G                    0x08
 100#define LP5521_RUN_B                    0x02
 101
 102static inline void lp5521_wait_opmode_done(void)
 103{
 104        /* operation mode change needs to be longer than 153 us */
 105        usleep_range(200, 300);
 106}
 107
 108static inline void lp5521_wait_enable_done(void)
 109{
 110        /* it takes more 488 us to update ENABLE register */
 111        usleep_range(500, 600);
 112}
 113
 114static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
 115{
 116        led->led_current = led_current;
 117        lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
 118                led_current);
 119}
 120
 121static void lp5521_load_engine(struct lp55xx_chip *chip)
 122{
 123        enum lp55xx_engine_index idx = chip->engine_idx;
 124        static const u8 mask[] = {
 125                [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 126                [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 127                [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 128        };
 129
 130        static const u8 val[] = {
 131                [LP55XX_ENGINE_1] = LP5521_LOAD_R,
 132                [LP55XX_ENGINE_2] = LP5521_LOAD_G,
 133                [LP55XX_ENGINE_3] = LP5521_LOAD_B,
 134        };
 135
 136        lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
 137
 138        lp5521_wait_opmode_done();
 139}
 140
 141static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
 142{
 143        lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
 144        lp5521_wait_opmode_done();
 145}
 146
 147static void lp5521_stop_engine(struct lp55xx_chip *chip)
 148{
 149        enum lp55xx_engine_index idx = chip->engine_idx;
 150        static const u8 mask[] = {
 151                [LP55XX_ENGINE_1] = LP5521_MODE_R_M,
 152                [LP55XX_ENGINE_2] = LP5521_MODE_G_M,
 153                [LP55XX_ENGINE_3] = LP5521_MODE_B_M,
 154        };
 155
 156        lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
 157
 158        lp5521_wait_opmode_done();
 159}
 160
 161static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
 162{
 163        int ret;
 164        u8 mode;
 165        u8 exec;
 166
 167        /* stop engine */
 168        if (!start) {
 169                lp5521_stop_engine(chip);
 170                lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 171                lp5521_wait_opmode_done();
 172                return;
 173        }
 174
 175        /*
 176         * To run the engine,
 177         * operation mode and enable register should updated at the same time
 178         */
 179
 180        ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
 181        if (ret)
 182                return;
 183
 184        ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
 185        if (ret)
 186                return;
 187
 188        /* change operation mode to RUN only when each engine is loading */
 189        if (LP5521_R_IS_LOADING(mode)) {
 190                mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
 191                exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
 192        }
 193
 194        if (LP5521_G_IS_LOADING(mode)) {
 195                mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
 196                exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
 197        }
 198
 199        if (LP5521_B_IS_LOADING(mode)) {
 200                mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
 201                exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
 202        }
 203
 204        lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
 205        lp5521_wait_opmode_done();
 206
 207        lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
 208        lp5521_wait_enable_done();
 209}
 210
 211static int lp5521_update_program_memory(struct lp55xx_chip *chip,
 212                                        const u8 *data, size_t size)
 213{
 214        enum lp55xx_engine_index idx = chip->engine_idx;
 215        u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
 216        static const u8 addr[] = {
 217                [LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
 218                [LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
 219                [LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
 220        };
 221        unsigned cmd;
 222        char c[3];
 223        int nrchars;
 224        int ret;
 225        int offset = 0;
 226        int i = 0;
 227
 228        while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
 229                /* separate sscanfs because length is working only for %s */
 230                ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
 231                if (ret != 1)
 232                        goto err;
 233
 234                ret = sscanf(c, "%2x", &cmd);
 235                if (ret != 1)
 236                        goto err;
 237
 238                pattern[i] = (u8)cmd;
 239                offset += nrchars;
 240                i++;
 241        }
 242
 243        /* Each instruction is 16bit long. Check that length is even */
 244        if (i % 2)
 245                goto err;
 246
 247        for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
 248                ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
 249                if (ret)
 250                        return -EINVAL;
 251        }
 252
 253        return size;
 254
 255err:
 256        dev_err(&chip->cl->dev, "wrong pattern format\n");
 257        return -EINVAL;
 258}
 259
 260static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
 261{
 262        const struct firmware *fw = chip->fw;
 263
 264        if (fw->size > LP5521_PROGRAM_LENGTH) {
 265                dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 266                        fw->size);
 267                return;
 268        }
 269
 270        /*
 271         * Program memory sequence
 272         *  1) set engine mode to "LOAD"
 273         *  2) write firmware data into program memory
 274         */
 275
 276        lp5521_load_engine(chip);
 277        lp5521_update_program_memory(chip, fw->data, fw->size);
 278}
 279
 280static int lp5521_post_init_device(struct lp55xx_chip *chip)
 281{
 282        int ret;
 283        u8 val;
 284
 285        /*
 286         * Make sure that the chip is reset by reading back the r channel
 287         * current reg. This is dummy read is required on some platforms -
 288         * otherwise further access to the R G B channels in the
 289         * LP5521_REG_ENABLE register will not have any effect - strange!
 290         */
 291        ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
 292        if (ret) {
 293                dev_err(&chip->cl->dev, "error in resetting chip\n");
 294                return ret;
 295        }
 296        if (val != LP5521_REG_R_CURR_DEFAULT) {
 297                dev_err(&chip->cl->dev,
 298                        "unexpected data in register (expected 0x%x got 0x%x)\n",
 299                        LP5521_REG_R_CURR_DEFAULT, val);
 300                ret = -EINVAL;
 301                return ret;
 302        }
 303        usleep_range(10000, 20000);
 304
 305        /* Set all PWMs to direct control mode */
 306        ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
 307
 308        /* Update configuration for the clock setting */
 309        val = LP5521_DEFAULT_CFG;
 310        if (!lp55xx_is_extclk_used(chip))
 311                val |= LP5521_CLK_INT;
 312
 313        ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
 314        if (ret)
 315                return ret;
 316
 317        /* Initialize all channels PWM to zero -> leds off */
 318        lp55xx_write(chip, LP5521_REG_R_PWM, 0);
 319        lp55xx_write(chip, LP5521_REG_G_PWM, 0);
 320        lp55xx_write(chip, LP5521_REG_B_PWM, 0);
 321
 322        /* Set engines are set to run state when OP_MODE enables engines */
 323        ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
 324        if (ret)
 325                return ret;
 326
 327        lp5521_wait_enable_done();
 328
 329        return 0;
 330}
 331
 332static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
 333{
 334        struct lp55xx_platform_data *pdata = chip->pdata;
 335        int ret;
 336        u8 status;
 337
 338        ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
 339        if (ret < 0)
 340                return ret;
 341
 342        if (pdata->clock_mode != LP55XX_CLOCK_EXT)
 343                return 0;
 344
 345        /* Check that ext clock is really in use if requested */
 346        if  ((status & LP5521_EXT_CLK_USED) == 0)
 347                return -EIO;
 348
 349        return 0;
 350}
 351
 352static int lp5521_multicolor_brightness(struct lp55xx_led *led)
 353{
 354        struct lp55xx_chip *chip = led->chip;
 355        int ret;
 356        int i;
 357
 358        mutex_lock(&chip->lock);
 359        for (i = 0; i < led->mc_cdev.num_colors; i++) {
 360                ret = lp55xx_write(chip,
 361                                   LP5521_REG_LED_PWM_BASE +
 362                                   led->mc_cdev.subled_info[i].channel,
 363                                   led->mc_cdev.subled_info[i].brightness);
 364                if (ret)
 365                        break;
 366        }
 367        mutex_unlock(&chip->lock);
 368        return ret;
 369}
 370
 371static int lp5521_led_brightness(struct lp55xx_led *led)
 372{
 373        struct lp55xx_chip *chip = led->chip;
 374        int ret;
 375
 376        mutex_lock(&chip->lock);
 377        ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
 378                led->brightness);
 379        mutex_unlock(&chip->lock);
 380
 381        return ret;
 382}
 383
 384static ssize_t show_engine_mode(struct device *dev,
 385                                struct device_attribute *attr,
 386                                char *buf, int nr)
 387{
 388        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 389        struct lp55xx_chip *chip = led->chip;
 390        enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
 391
 392        switch (mode) {
 393        case LP55XX_ENGINE_RUN:
 394                return sprintf(buf, "run\n");
 395        case LP55XX_ENGINE_LOAD:
 396                return sprintf(buf, "load\n");
 397        case LP55XX_ENGINE_DISABLED:
 398        default:
 399                return sprintf(buf, "disabled\n");
 400        }
 401}
 402show_mode(1)
 403show_mode(2)
 404show_mode(3)
 405
 406static ssize_t store_engine_mode(struct device *dev,
 407                                 struct device_attribute *attr,
 408                                 const char *buf, size_t len, int nr)
 409{
 410        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 411        struct lp55xx_chip *chip = led->chip;
 412        struct lp55xx_engine *engine = &chip->engines[nr - 1];
 413
 414        mutex_lock(&chip->lock);
 415
 416        chip->engine_idx = nr;
 417
 418        if (!strncmp(buf, "run", 3)) {
 419                lp5521_run_engine(chip, true);
 420                engine->mode = LP55XX_ENGINE_RUN;
 421        } else if (!strncmp(buf, "load", 4)) {
 422                lp5521_stop_engine(chip);
 423                lp5521_load_engine(chip);
 424                engine->mode = LP55XX_ENGINE_LOAD;
 425        } else if (!strncmp(buf, "disabled", 8)) {
 426                lp5521_stop_engine(chip);
 427                engine->mode = LP55XX_ENGINE_DISABLED;
 428        }
 429
 430        mutex_unlock(&chip->lock);
 431
 432        return len;
 433}
 434store_mode(1)
 435store_mode(2)
 436store_mode(3)
 437
 438static ssize_t store_engine_load(struct device *dev,
 439                             struct device_attribute *attr,
 440                             const char *buf, size_t len, int nr)
 441{
 442        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 443        struct lp55xx_chip *chip = led->chip;
 444        int ret;
 445
 446        mutex_lock(&chip->lock);
 447
 448        chip->engine_idx = nr;
 449        lp5521_load_engine(chip);
 450        ret = lp5521_update_program_memory(chip, buf, len);
 451
 452        mutex_unlock(&chip->lock);
 453
 454        return ret;
 455}
 456store_load(1)
 457store_load(2)
 458store_load(3)
 459
 460static ssize_t lp5521_selftest(struct device *dev,
 461                               struct device_attribute *attr,
 462                               char *buf)
 463{
 464        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 465        struct lp55xx_chip *chip = led->chip;
 466        int ret;
 467
 468        mutex_lock(&chip->lock);
 469        ret = lp5521_run_selftest(chip, buf);
 470        mutex_unlock(&chip->lock);
 471
 472        return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
 473}
 474
 475/* device attributes */
 476static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
 477static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
 478static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
 479static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
 480static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
 481static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
 482static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
 483
 484static struct attribute *lp5521_attributes[] = {
 485        &dev_attr_engine1_mode.attr,
 486        &dev_attr_engine2_mode.attr,
 487        &dev_attr_engine3_mode.attr,
 488        &dev_attr_engine1_load.attr,
 489        &dev_attr_engine2_load.attr,
 490        &dev_attr_engine3_load.attr,
 491        &dev_attr_selftest.attr,
 492        NULL
 493};
 494
 495static const struct attribute_group lp5521_group = {
 496        .attrs = lp5521_attributes,
 497};
 498
 499/* Chip specific configurations */
 500static struct lp55xx_device_config lp5521_cfg = {
 501        .reset = {
 502                .addr = LP5521_REG_RESET,
 503                .val  = LP5521_RESET,
 504        },
 505        .enable = {
 506                .addr = LP5521_REG_ENABLE,
 507                .val  = LP5521_ENABLE_DEFAULT,
 508        },
 509        .max_channel  = LP5521_MAX_LEDS,
 510        .post_init_device   = lp5521_post_init_device,
 511        .brightness_fn      = lp5521_led_brightness,
 512        .multicolor_brightness_fn = lp5521_multicolor_brightness,
 513        .set_led_current    = lp5521_set_led_current,
 514        .firmware_cb        = lp5521_firmware_loaded,
 515        .run_engine         = lp5521_run_engine,
 516        .dev_attr_group     = &lp5521_group,
 517};
 518
 519static int lp5521_probe(struct i2c_client *client,
 520                        const struct i2c_device_id *id)
 521{
 522        int ret;
 523        struct lp55xx_chip *chip;
 524        struct lp55xx_led *led;
 525        struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
 526        struct device_node *np = dev_of_node(&client->dev);
 527
 528        chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 529        if (!chip)
 530                return -ENOMEM;
 531
 532        chip->cfg = &lp5521_cfg;
 533
 534        if (!pdata) {
 535                if (np) {
 536                        pdata = lp55xx_of_populate_pdata(&client->dev, np,
 537                                                         chip);
 538                        if (IS_ERR(pdata))
 539                                return PTR_ERR(pdata);
 540                } else {
 541                        dev_err(&client->dev, "no platform data\n");
 542                        return -EINVAL;
 543                }
 544        }
 545
 546        led = devm_kcalloc(&client->dev,
 547                        pdata->num_channels, sizeof(*led), GFP_KERNEL);
 548        if (!led)
 549                return -ENOMEM;
 550
 551        chip->cl = client;
 552        chip->pdata = pdata;
 553
 554        mutex_init(&chip->lock);
 555
 556        i2c_set_clientdata(client, led);
 557
 558        ret = lp55xx_init_device(chip);
 559        if (ret)
 560                goto err_init;
 561
 562        dev_info(&client->dev, "%s programmable led chip found\n", id->name);
 563
 564        ret = lp55xx_register_leds(led, chip);
 565        if (ret)
 566                goto err_out;
 567
 568        ret = lp55xx_register_sysfs(chip);
 569        if (ret) {
 570                dev_err(&client->dev, "registering sysfs failed\n");
 571                goto err_out;
 572        }
 573
 574        return 0;
 575
 576err_out:
 577        lp55xx_deinit_device(chip);
 578err_init:
 579        return ret;
 580}
 581
 582static int lp5521_remove(struct i2c_client *client)
 583{
 584        struct lp55xx_led *led = i2c_get_clientdata(client);
 585        struct lp55xx_chip *chip = led->chip;
 586
 587        lp5521_stop_all_engines(chip);
 588        lp55xx_unregister_sysfs(chip);
 589        lp55xx_deinit_device(chip);
 590
 591        return 0;
 592}
 593
 594static const struct i2c_device_id lp5521_id[] = {
 595        { "lp5521", 0 }, /* Three channel chip */
 596        { }
 597};
 598MODULE_DEVICE_TABLE(i2c, lp5521_id);
 599
 600#ifdef CONFIG_OF
 601static const struct of_device_id of_lp5521_leds_match[] = {
 602        { .compatible = "national,lp5521", },
 603        {},
 604};
 605
 606MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
 607#endif
 608static struct i2c_driver lp5521_driver = {
 609        .driver = {
 610                .name   = "lp5521",
 611                .of_match_table = of_match_ptr(of_lp5521_leds_match),
 612        },
 613        .probe          = lp5521_probe,
 614        .remove         = lp5521_remove,
 615        .id_table       = lp5521_id,
 616};
 617
 618module_i2c_driver(lp5521_driver);
 619
 620MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
 621MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 622MODULE_DESCRIPTION("LP5521 LED engine");
 623MODULE_LICENSE("GPL v2");
 624