drivers/leds/leds-lp5562.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LP5562 LED driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments
   6  *
   7  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
   8  */
   9
  10 #include <linux/cleanup.h>
  11 #include <linux/delay.h>
  12 #include <linux/firmware.h>
  13 #include <linux/i2c.h>
  14 #include <linux/leds.h>
  15 #include <linux/module.h>
  16 #include <linux/mutex.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_data/leds-lp55xx.h>
  19 #include <linux/slab.h>
  20
  21 #include "leds-lp55xx-common.h"
  22
  23 #define LP5562_MAX_LEDS                 4
  24
  25 /* ENABLE Register 00h */
  26 #define LP5562_REG_ENABLE               0x00
  27 #define LP5562_EXEC_ENG1_M              0x30
  28 #define LP5562_EXEC_ENG2_M              0x0C
  29 #define LP5562_EXEC_ENG3_M              0x03
  30 #define LP5562_EXEC_M                   0x3F
  31 #define LP5562_MASTER_ENABLE            0x40    /* Chip master enable */
  32 #define LP5562_LOGARITHMIC_PWM          0x80    /* Logarithmic PWM adjustment */
  33 #define LP5562_EXEC_RUN                 0x2A
  34 #define LP5562_ENABLE_DEFAULT   \
  35         (LP5562_MASTER_ENABLE | LP5562_LOGARITHMIC_PWM)
  36 #define LP5562_ENABLE_RUN_PROGRAM       \
  37         (LP5562_ENABLE_DEFAULT | LP5562_EXEC_RUN)
  38
  39 /* OPMODE Register 01h */
  40 #define LP5562_REG_OP_MODE              0x01
  41
  42 /* BRIGHTNESS Registers */
  43 #define LP5562_REG_R_PWM                0x04
  44 #define LP5562_REG_G_PWM                0x03
  45 #define LP5562_REG_B_PWM                0x02
  46 #define LP5562_REG_W_PWM                0x0E
  47
  48 /* CURRENT Registers */
  49 #define LP5562_REG_R_CURRENT            0x07
  50 #define LP5562_REG_G_CURRENT            0x06
  51 #define LP5562_REG_B_CURRENT            0x05
  52 #define LP5562_REG_W_CURRENT            0x0F
  53
  54 /* CONFIG Register 08h */
  55 #define LP5562_REG_CONFIG               0x08
  56 #define LP5562_PWM_HF                   0x40
  57 #define LP5562_PWRSAVE_EN               0x20
  58 #define LP5562_CLK_INT                  0x01    /* Internal clock */
  59 #define LP5562_DEFAULT_CFG              (LP5562_PWM_HF | LP5562_PWRSAVE_EN)
  60
  61 /* RESET Register 0Dh */
  62 #define LP5562_REG_RESET                0x0D
  63 #define LP5562_RESET                    0xFF
  64
  65 /* PROGRAM ENGINE Registers */
  66 #define LP5562_REG_PROG_MEM_ENG1        0x10
  67 #define LP5562_REG_PROG_MEM_ENG2        0x30
  68 #define LP5562_REG_PROG_MEM_ENG3        0x50
  69
  70 /* LEDMAP Register 70h */
  71 #define LP5562_REG_ENG_SEL              0x70
  72 #define LP5562_ENG_SEL_PWM              0
  73 #define LP5562_ENG_FOR_RGB_M            0x3F
  74 #define LP5562_ENG_SEL_RGB              0x1B    /* R:ENG1, G:ENG2, B:ENG3 */
  75 #define LP5562_ENG_FOR_W_M              0xC0
  76 #define LP5562_ENG1_FOR_W               0x40    /* W:ENG1 */
  77 #define LP5562_ENG2_FOR_W               0x80    /* W:ENG2 */
  78 #define LP5562_ENG3_FOR_W               0xC0    /* W:ENG3 */
  79
  80 /* Program Commands */
  81 #define LP5562_CMD_DISABLE              0x00
  82 #define LP5562_CMD_LOAD                 0x15
  83 #define LP5562_CMD_RUN                  0x2A
  84 #define LP5562_CMD_DIRECT               0x3F
  85 #define LP5562_PATTERN_OFF              0
  86
  87 static inline void lp5562_wait_opmode_done(void)
  88 {
  89         /* operation mode change needs to be longer than 153 us */
  90         usleep_range(200, 300);
  91 }
  92
  93 static inline void lp5562_wait_enable_done(void)
  94 {
  95         /* it takes more 488 us to update ENABLE register */
  96         usleep_range(500, 600);
  97 }
  98
  99 static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
 100 {
 101         static const u8 addr[] = {
 102                 LP5562_REG_R_CURRENT,
 103                 LP5562_REG_G_CURRENT,
 104                 LP5562_REG_B_CURRENT,
 105                 LP5562_REG_W_CURRENT,
 106         };
 107
 108         led->led_current = led_current;
 109         lp55xx_write(led->chip, addr[led->chan_nr], led_current);
 110 }
 111
 112 static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
 113 {
 114         int ret;
 115
 116         /* stop engine */
 117         if (!start) {
 118                 lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
 119                 lp5562_wait_enable_done();
 120                 lp55xx_stop_all_engine(chip);
 121                 lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
 122                 lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
 123                 lp5562_wait_opmode_done();
 124                 return;
 125         }
 126
 127         ret = lp55xx_run_engine_common(chip);
 128         if (!ret)
 129                 lp5562_wait_enable_done();
 130 }
 131
 132 static int lp5562_post_init_device(struct lp55xx_chip *chip)
 133 {
 134         int ret;
 135         u8 cfg = LP5562_DEFAULT_CFG;
 136
 137         /* Set all PWMs to direct control mode */
 138         ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
 139         if (ret)
 140                 return ret;
 141
 142         lp5562_wait_opmode_done();
 143
 144         /* Update configuration for the clock setting */
 145         if (!lp55xx_is_extclk_used(chip))
 146                 cfg |= LP5562_CLK_INT;
 147
 148         ret = lp55xx_write(chip, LP5562_REG_CONFIG, cfg);
 149         if (ret)
 150                 return ret;
 151
 152         /* Initialize all channels PWM to zero -> leds off */
 153         lp55xx_write(chip, LP5562_REG_R_PWM, 0);
 154         lp55xx_write(chip, LP5562_REG_G_PWM, 0);
 155         lp55xx_write(chip, LP5562_REG_B_PWM, 0);
 156         lp55xx_write(chip, LP5562_REG_W_PWM, 0);
 157
 158         /* Set LED map as register PWM by default */
 159         lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
 160
 161         return 0;
 162 }
 163
 164 static int lp5562_multicolor_brightness(struct lp55xx_led *led)
 165 {
 166         struct lp55xx_chip *chip = led->chip;
 167         static const u8 addr[] = {
 168                 LP5562_REG_R_PWM,
 169                 LP5562_REG_G_PWM,
 170                 LP5562_REG_B_PWM,
 171                 LP5562_REG_W_PWM,
 172         };
 173         int ret;
 174         int i;
 175
 176         guard(mutex)(&chip->lock);
 177         for (i = 0; i < led->mc_cdev.num_colors; i++) {
 178                 ret = lp55xx_write(chip,
 179                                    addr[led->mc_cdev.subled_info[i].channel],
 180                                    led->mc_cdev.subled_info[i].brightness);
 181                 if (ret)
 182                         break;
 183         }
 184
 185         return ret;
 186 }
 187
 188 static int lp5562_led_brightness(struct lp55xx_led *led)
 189 {
 190         struct lp55xx_chip *chip = led->chip;
 191         static const u8 addr[] = {
 192                 LP5562_REG_R_PWM,
 193                 LP5562_REG_G_PWM,
 194                 LP5562_REG_B_PWM,
 195                 LP5562_REG_W_PWM,
 196         };
 197         int ret;
 198
 199         guard(mutex)(&chip->lock);
 200
 201         ret = lp55xx_write(chip, addr[led->chan_nr], led->brightness);
 202
 203         return ret;
 204 }
 205
 206 static void lp5562_write_program_memory(struct lp55xx_chip *chip,
 207                                         u8 base, const u8 *rgb, int size)
 208 {
 209         int i;
 210
 211         if (!rgb || size <= 0)
 212                 return;
 213
 214         for (i = 0; i < size; i++)
 215                 lp55xx_write(chip, base + i, *(rgb + i));
 216
 217         lp55xx_write(chip, base + i, 0);
 218         lp55xx_write(chip, base + i + 1, 0);
 219 }
 220
 221 /* check the size of program count */
 222 static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn)
 223 {
 224         return ptn->size_r >= LP55xx_BYTES_PER_PAGE ||
 225                ptn->size_g >= LP55xx_BYTES_PER_PAGE ||
 226                ptn->size_b >= LP55xx_BYTES_PER_PAGE;
 227 }
 228
 229 static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
 230 {
 231         struct lp55xx_predef_pattern *ptn;
 232         int i;
 233
 234         if (mode == LP5562_PATTERN_OFF) {
 235                 lp5562_run_engine(chip, false);
 236                 return 0;
 237         }
 238
 239         ptn = chip->pdata->patterns + (mode - 1);
 240         if (!ptn || _is_pc_overflow(ptn)) {
 241                 dev_err(&chip->cl->dev, "invalid pattern data\n");
 242                 return -EINVAL;
 243         }
 244
 245         lp55xx_stop_all_engine(chip);
 246
 247         /* Set LED map as RGB */
 248         lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);
 249
 250         /* Load engines */
 251         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
 252                 chip->engine_idx = i;
 253                 lp55xx_load_engine(chip);
 254         }
 255
 256         /* Clear program registers */
 257         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0);
 258         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0);
 259         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0);
 260         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0);
 261         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0);
 262         lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0);
 263
 264         /* Program engines */
 265         lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1,
 266                                 ptn->r, ptn->size_r);
 267         lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2,
 268                                 ptn->g, ptn->size_g);
 269         lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3,
 270                                 ptn->b, ptn->size_b);
 271
 272         /* Run engines */
 273         lp5562_run_engine(chip, true);
 274
 275         return 0;
 276 }
 277
 278 static ssize_t lp5562_store_pattern(struct device *dev,
 279                                 struct device_attribute *attr,
 280                                 const char *buf, size_t len)
 281 {
 282         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 283         struct lp55xx_chip *chip = led->chip;
 284         struct lp55xx_predef_pattern *ptn = chip->pdata->patterns;
 285         int num_patterns = chip->pdata->num_patterns;
 286         unsigned long mode;
 287         int ret;
 288
 289         ret = kstrtoul(buf, 0, &mode);
 290         if (ret)
 291                 return ret;
 292
 293         if (mode > num_patterns || !ptn)
 294                 return -EINVAL;
 295
 296         guard(mutex)(&chip->lock);
 297
 298         ret = lp5562_run_predef_led_pattern(chip, mode);
 299
 300         if (ret)
 301                 return ret;
 302
 303         return len;
 304 }
 305
 306 static ssize_t lp5562_store_engine_mux(struct device *dev,
 307                                      struct device_attribute *attr,
 308                                      const char *buf, size_t len)
 309 {
 310         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 311         struct lp55xx_chip *chip = led->chip;
 312         u8 mask;
 313         u8 val;
 314
 315         /* LED map
 316          * R ... Engine 1 (fixed)
 317          * G ... Engine 2 (fixed)
 318          * B ... Engine 3 (fixed)
 319          * W ... Engine 1 or 2 or 3
 320          */
 321
 322         if (sysfs_streq(buf, "RGB")) {
 323                 mask = LP5562_ENG_FOR_RGB_M;
 324                 val = LP5562_ENG_SEL_RGB;
 325         } else if (sysfs_streq(buf, "W")) {
 326                 enum lp55xx_engine_index idx = chip->engine_idx;
 327
 328                 mask = LP5562_ENG_FOR_W_M;
 329                 switch (idx) {
 330                 case LP55XX_ENGINE_1:
 331                         val = LP5562_ENG1_FOR_W;
 332                         break;
 333                 case LP55XX_ENGINE_2:
 334                         val = LP5562_ENG2_FOR_W;
 335                         break;
 336                 case LP55XX_ENGINE_3:
 337                         val = LP5562_ENG3_FOR_W;
 338                         break;
 339                 default:
 340                         return -EINVAL;
 341                 }
 342
 343         } else {
 344                 dev_err(dev, "choose RGB or W\n");
 345                 return -EINVAL;
 346         }
 347
 348         guard(mutex)(&chip->lock);
 349
 350         lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val);
 351
 352         return len;
 353 }
 354
 355 static LP55XX_DEV_ATTR_WO(led_pattern, lp5562_store_pattern);
 356 static LP55XX_DEV_ATTR_WO(engine_mux, lp5562_store_engine_mux);
 357
 358 static struct attribute *lp5562_attributes[] = {
 359         &dev_attr_led_pattern.attr,
 360         &dev_attr_engine_mux.attr,
 361         NULL,
 362 };
 363
 364 static const struct attribute_group lp5562_group = {
 365         .attrs = lp5562_attributes,
 366 };
 367
 368 /* Chip specific configurations */
 369 static struct lp55xx_device_config lp5562_cfg = {
 370         .max_channel  = LP5562_MAX_LEDS,
 371         .reg_op_mode = {
 372                 .addr = LP5562_REG_OP_MODE,
 373         },
 374         .reg_exec = {
 375                 .addr = LP5562_REG_ENABLE,
 376         },
 377         .reset = {
 378                 .addr = LP5562_REG_RESET,
 379                 .val  = LP5562_RESET,
 380         },
 381         .enable = {
 382                 .addr = LP5562_REG_ENABLE,
 383                 .val  = LP5562_ENABLE_DEFAULT,
 384         },
 385         .prog_mem_base = {
 386                 .addr = LP5562_REG_PROG_MEM_ENG1,
 387         },
 388         .post_init_device   = lp5562_post_init_device,
 389         .set_led_current    = lp5562_set_led_current,
 390         .brightness_fn      = lp5562_led_brightness,
 391         .multicolor_brightness_fn = lp5562_multicolor_brightness,
 392         .run_engine         = lp5562_run_engine,
 393         .firmware_cb        = lp55xx_firmware_loaded_cb,
 394         .dev_attr_group     = &lp5562_group,
 395 };
 396
 397 static const struct i2c_device_id lp5562_id[] = {
 398         { "lp5562", .driver_data = (kernel_ulong_t)&lp5562_cfg, },
 399         { }
 400 };
 401 MODULE_DEVICE_TABLE(i2c, lp5562_id);
 402
 403 static const struct of_device_id of_lp5562_leds_match[] = {
 404         { .compatible = "ti,lp5562", .data = &lp5562_cfg, },
 405         {},
 406 };
 407
 408 MODULE_DEVICE_TABLE(of, of_lp5562_leds_match);
 409
 410 static struct i2c_driver lp5562_driver = {
 411         .driver = {
 412                 .name   = "lp5562",
 413                 .of_match_table = of_lp5562_leds_match,
 414         },
 415         .probe          = lp55xx_probe,
 416         .remove         = lp55xx_remove,
 417         .id_table       = lp5562_id,
 418 };
 419
 420 module_i2c_driver(lp5562_driver);
 421
 422 MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver");
 423 MODULE_AUTHOR("Milo Kim");
 424 MODULE_LICENSE("GPL");