drivers/leds/leds-lp5523.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * lp5523.c - LP5523, LP55231 LED 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/cleanup.h>
  13 #include <linux/delay.h>
  14 #include <linux/firmware.h>
  15 #include <linux/i2c.h>
  16 #include <linux/leds.h>
  17 #include <linux/module.h>
  18 #include <linux/mutex.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_data/leds-lp55xx.h>
  21 #include <linux/slab.h>
  22
  23 #include "leds-lp55xx-common.h"
  24
  25 /* Memory is used like this:
  26  * 0x00 engine 1 program
  27  * 0x10 engine 2 program
  28  * 0x20 engine 3 program
  29  * 0x30 engine 1 muxing info
  30  * 0x40 engine 2 muxing info
  31  * 0x50 engine 3 muxing info
  32  */
  33 #define LP5523_PAGES_PER_ENGINE         1
  34 #define LP5523_MAX_LEDS                 9
  35
  36 /* Registers */
  37 #define LP5523_REG_ENABLE               0x00
  38 #define LP5523_REG_OP_MODE              0x01
  39 #define LP5523_REG_ENABLE_LEDS_MSB      0x04
  40 #define LP5523_REG_ENABLE_LEDS_LSB      0x05
  41 #define LP5523_REG_LED_CTRL_BASE        0x06
  42 #define LP5523_REG_LED_PWM_BASE         0x16
  43 #define LP5523_REG_LED_CURRENT_BASE     0x26
  44 #define LP5523_REG_CONFIG               0x36
  45
  46 #define LP5523_REG_STATUS               0x3A
  47 #define LP5523_ENGINE_BUSY              BIT(4)
  48
  49 #define LP5523_REG_RESET                0x3D
  50 #define LP5523_REG_LED_TEST_CTRL        0x41
  51 #define LP5523_REG_LED_TEST_ADC         0x42
  52 #define LP5523_REG_MASTER_FADER_BASE    0x48
  53 #define LP5523_REG_CH1_PROG_START       0x4C
  54 #define LP5523_REG_CH2_PROG_START       0x4D
  55 #define LP5523_REG_CH3_PROG_START       0x4E
  56 #define LP5523_REG_PROG_PAGE_SEL        0x4F
  57 #define LP5523_REG_PROG_MEM             0x50
  58
  59 /* Bit description in registers */
  60 #define LP5523_ENABLE                   0x40
  61 #define LP5523_AUTO_INC                 0x40
  62 #define LP5523_PWR_SAVE                 0x20
  63 #define LP5523_PWM_PWR_SAVE             0x04
  64 #define LP5523_CP_MODE_MASK             0x18
  65 #define LP5523_CP_MODE_SHIFT            3
  66 #define LP5523_AUTO_CLK                 0x02
  67 #define LP5523_DEFAULT_CONFIG \
  68         (LP5523_AUTO_INC | LP5523_PWR_SAVE | LP5523_AUTO_CLK | LP5523_PWM_PWR_SAVE)
  69
  70 #define LP5523_EN_LEDTEST               0x80
  71 #define LP5523_LEDTEST_DONE             0x80
  72 #define LP5523_RESET                    0xFF
  73 #define LP5523_ADC_SHORTCIRC_LIM        80
  74 #define LP5523_EXT_CLK_USED             0x08
  75 #define LP5523_ENG_STATUS_MASK          0x07
  76
  77 static int lp5523_init_program_engine(struct lp55xx_chip *chip);
  78
  79 static int lp5523_post_init_device(struct lp55xx_chip *chip)
  80 {
  81         int ret;
  82         int val;
  83
  84         ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
  85         if (ret)
  86                 return ret;
  87
  88         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
  89         usleep_range(1000, 2000);
  90
  91         val = LP5523_DEFAULT_CONFIG;
  92         val |= (chip->pdata->charge_pump_mode << LP5523_CP_MODE_SHIFT) & LP5523_CP_MODE_MASK;
  93
  94         ret = lp55xx_write(chip, LP5523_REG_CONFIG, val);
  95         if (ret)
  96                 return ret;
  97
  98         /* turn on all leds */
  99         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
 100         if (ret)
 101                 return ret;
 102
 103         ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
 104         if (ret)
 105                 return ret;
 106
 107         return lp5523_init_program_engine(chip);
 108 }
 109
 110 static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
 111 {
 112         /* stop engine */
 113         if (!start) {
 114                 lp55xx_stop_engine(chip);
 115                 lp55xx_turn_off_channels(chip);
 116                 return;
 117         }
 118
 119         lp55xx_run_engine_common(chip);
 120 }
 121
 122 static int lp5523_init_program_engine(struct lp55xx_chip *chip)
 123 {
 124         int i;
 125         int j;
 126         int ret;
 127         u8 status;
 128         /* one pattern per engine setting LED MUX start and stop addresses */
 129         static const u8 pattern[][LP55xx_BYTES_PER_PAGE] =  {
 130                 { 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
 131                 { 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
 132                 { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
 133         };
 134
 135         /* hardcode 32 bytes of memory for each engine from program memory */
 136         ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
 137         if (ret)
 138                 return ret;
 139
 140         ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
 141         if (ret)
 142                 return ret;
 143
 144         ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
 145         if (ret)
 146                 return ret;
 147
 148         /* write LED MUX address space for each engine */
 149         for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
 150                 chip->engine_idx = i;
 151                 lp55xx_load_engine(chip);
 152
 153                 for (j = 0; j < LP55xx_BYTES_PER_PAGE; j++) {
 154                         ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
 155                                         pattern[i - 1][j]);
 156                         if (ret)
 157                                 goto out;
 158                 }
 159         }
 160
 161         lp5523_run_engine(chip, true);
 162
 163         /* Let the programs run for couple of ms and check the engine status */
 164         usleep_range(3000, 6000);
 165         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 166         if (ret)
 167                 goto out;
 168         status &= LP5523_ENG_STATUS_MASK;
 169
 170         if (status != LP5523_ENG_STATUS_MASK) {
 171                 dev_err(&chip->cl->dev,
 172                         "could not configure LED engine, status = 0x%.2x\n",
 173                         status);
 174                 ret = -1;
 175         }
 176
 177 out:
 178         lp55xx_stop_all_engine(chip);
 179         return ret;
 180 }
 181
 182 static ssize_t lp5523_selftest(struct device *dev,
 183                                struct device_attribute *attr,
 184                                char *buf)
 185 {
 186         struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
 187         struct lp55xx_chip *chip = led->chip;
 188         struct lp55xx_platform_data *pdata = chip->pdata;
 189         int ret, pos = 0;
 190         u8 status, adc, vdd, i;
 191
 192         guard(mutex)(&chip->lock);
 193
 194         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 195         if (ret < 0)
 196                 return sysfs_emit(buf, "FAIL\n");
 197
 198         /* Check that ext clock is really in use if requested */
 199         if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
 200                 if  ((status & LP5523_EXT_CLK_USED) == 0)
 201                         return sysfs_emit(buf, "FAIL\n");
 202         }
 203
 204         /* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
 205         lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
 206         usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
 207         ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 208         if (ret < 0)
 209                 return sysfs_emit(buf, "FAIL\n");
 210
 211         if (!(status & LP5523_LEDTEST_DONE))
 212                 usleep_range(3000, 6000); /* Was not ready. Wait little bit */
 213
 214         ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
 215         if (ret < 0)
 216                 return sysfs_emit(buf, "FAIL\n");
 217
 218         vdd--;  /* There may be some fluctuation in measurement */
 219
 220         for (i = 0; i < pdata->num_channels; i++) {
 221                 /* Skip disabled channels */
 222                 if (pdata->led_config[i].led_current == 0)
 223                         continue;
 224
 225                 /* Set default current */
 226                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 227                         pdata->led_config[i].led_current);
 228
 229                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 230                              0xff);
 231                 /* let current stabilize 2 - 4ms before measurements start */
 232                 usleep_range(2000, 4000);
 233                 lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
 234                              LP5523_EN_LEDTEST | led->chan_nr);
 235                 /* ADC conversion time is 2.7 ms typically */
 236                 usleep_range(3000, 6000);
 237                 ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
 238                 if (ret < 0)
 239                         return sysfs_emit(buf, "FAIL\n");
 240
 241                 if (!(status & LP5523_LEDTEST_DONE))
 242                         usleep_range(3000, 6000); /* Was not ready. Wait. */
 243
 244                 ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
 245                 if (ret < 0)
 246                         return sysfs_emit(buf, "FAIL\n");
 247
 248                 if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
 249                         pos += sysfs_emit_at(buf, pos, "LED %d FAIL\n",
 250                                              led->chan_nr);
 251
 252                 lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
 253                              0x00);
 254
 255                 /* Restore current */
 256                 lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
 257                              led->led_current);
 258                 led++;
 259         }
 260
 261         return pos == 0 ? sysfs_emit(buf, "OK\n") : pos;
 262 }
 263
 264 LP55XX_DEV_ATTR_ENGINE_MODE(1);
 265 LP55XX_DEV_ATTR_ENGINE_MODE(2);
 266 LP55XX_DEV_ATTR_ENGINE_MODE(3);
 267 LP55XX_DEV_ATTR_ENGINE_LEDS(1);
 268 LP55XX_DEV_ATTR_ENGINE_LEDS(2);
 269 LP55XX_DEV_ATTR_ENGINE_LEDS(3);
 270 LP55XX_DEV_ATTR_ENGINE_LOAD(1);
 271 LP55XX_DEV_ATTR_ENGINE_LOAD(2);
 272 LP55XX_DEV_ATTR_ENGINE_LOAD(3);
 273 static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
 274 LP55XX_DEV_ATTR_MASTER_FADER(1);
 275 LP55XX_DEV_ATTR_MASTER_FADER(2);
 276 LP55XX_DEV_ATTR_MASTER_FADER(3);
 277 static LP55XX_DEV_ATTR_RW(master_fader_leds, lp55xx_show_master_fader_leds,
 278                           lp55xx_store_master_fader_leds);
 279
 280 static struct attribute *lp5523_attributes[] = {
 281         &dev_attr_engine1_mode.attr,
 282         &dev_attr_engine2_mode.attr,
 283         &dev_attr_engine3_mode.attr,
 284         &dev_attr_engine1_load.attr,
 285         &dev_attr_engine2_load.attr,
 286         &dev_attr_engine3_load.attr,
 287         &dev_attr_engine1_leds.attr,
 288         &dev_attr_engine2_leds.attr,
 289         &dev_attr_engine3_leds.attr,
 290         &dev_attr_selftest.attr,
 291         &dev_attr_master_fader1.attr,
 292         &dev_attr_master_fader2.attr,
 293         &dev_attr_master_fader3.attr,
 294         &dev_attr_master_fader_leds.attr,
 295         NULL,
 296 };
 297
 298 static const struct attribute_group lp5523_group = {
 299         .attrs = lp5523_attributes,
 300 };
 301
 302 /* Chip specific configurations */
 303 static struct lp55xx_device_config lp5523_cfg = {
 304         .reg_op_mode = {
 305                 .addr = LP5523_REG_OP_MODE,
 306         },
 307         .reg_exec = {
 308                 .addr = LP5523_REG_ENABLE,
 309         },
 310         .engine_busy = {
 311                 .addr = LP5523_REG_STATUS,
 312                 .mask  = LP5523_ENGINE_BUSY,
 313         },
 314         .reset = {
 315                 .addr = LP5523_REG_RESET,
 316                 .val  = LP5523_RESET,
 317         },
 318         .enable = {
 319                 .addr = LP5523_REG_ENABLE,
 320                 .val  = LP5523_ENABLE,
 321         },
 322         .prog_mem_base = {
 323                 .addr = LP5523_REG_PROG_MEM,
 324         },
 325         .reg_led_pwm_base = {
 326                 .addr = LP5523_REG_LED_PWM_BASE,
 327         },
 328         .reg_led_current_base = {
 329                 .addr = LP5523_REG_LED_CURRENT_BASE,
 330         },
 331         .reg_master_fader_base = {
 332                 .addr = LP5523_REG_MASTER_FADER_BASE,
 333         },
 334         .reg_led_ctrl_base = {
 335                 .addr = LP5523_REG_LED_CTRL_BASE,
 336         },
 337         .pages_per_engine   = LP5523_PAGES_PER_ENGINE,
 338         .max_channel  = LP5523_MAX_LEDS,
 339         .post_init_device   = lp5523_post_init_device,
 340         .brightness_fn      = lp55xx_led_brightness,
 341         .multicolor_brightness_fn = lp55xx_multicolor_brightness,
 342         .set_led_current    = lp55xx_set_led_current,
 343         .firmware_cb        = lp55xx_firmware_loaded_cb,
 344         .run_engine         = lp5523_run_engine,
 345         .dev_attr_group     = &lp5523_group,
 346 };
 347
 348 static const struct i2c_device_id lp5523_id[] = {
 349         { "lp5523",  .driver_data = (kernel_ulong_t)&lp5523_cfg, },
 350         { "lp55231", .driver_data = (kernel_ulong_t)&lp5523_cfg, },
 351         { }
 352 };
 353
 354 MODULE_DEVICE_TABLE(i2c, lp5523_id);
 355
 356 static const struct of_device_id of_lp5523_leds_match[] = {
 357         { .compatible = "national,lp5523", .data = &lp5523_cfg, },
 358         { .compatible = "ti,lp55231", .data = &lp5523_cfg, },
 359         {},
 360 };
 361
 362 MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
 363
 364 static struct i2c_driver lp5523_driver = {
 365         .driver = {
 366                 .name   = "lp5523x",
 367                 .of_match_table = of_lp5523_leds_match,
 368         },
 369         .probe          = lp55xx_probe,
 370         .remove         = lp55xx_remove,
 371         .id_table       = lp5523_id,
 372 };
 373
 374 module_i2c_driver(lp5523_driver);
 375
 376 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
 377 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
 378 MODULE_DESCRIPTION("LP5523 LED engine");
 379 MODULE_LICENSE("GPL");