drivers/leds/leds-lp8501.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TI LP8501 9 channel LED Driver
   4  *
   5  * Copyright (C) 2013 Texas Instruments
   6  *
   7  * Author: Milo(Woogyom) Kim <[email protected]>
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/firmware.h>
  12 #include <linux/i2c.h>
  13 #include <linux/init.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 LP8501_PAGES_PER_ENGINE         1
  24 #define LP8501_MAX_LEDS                 9
  25
  26 /* Registers */
  27 #define LP8501_REG_ENABLE               0x00
  28 #define LP8501_ENABLE                   BIT(6)
  29
  30 #define LP8501_REG_OP_MODE              0x01
  31
  32 #define LP8501_REG_PWR_CONFIG           0x05
  33 #define LP8501_PWR_CONFIG_M             0x03
  34
  35 #define LP8501_REG_LED_PWM_BASE         0x16
  36
  37 #define LP8501_REG_LED_CURRENT_BASE     0x26
  38
  39 #define LP8501_REG_CONFIG               0x36
  40 #define LP8501_PWM_PSAVE                BIT(7)
  41 #define LP8501_AUTO_INC                 BIT(6)
  42 #define LP8501_PWR_SAVE                 BIT(5)
  43 #define LP8501_CP_MODE_MASK             0x18
  44 #define LP8501_CP_MODE_SHIFT            3
  45 #define LP8501_INT_CLK                  BIT(0)
  46 #define LP8501_DEFAULT_CFG (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE)
  47
  48 #define LP8501_REG_STATUS               0x3A
  49 #define LP8501_ENGINE_BUSY              BIT(4)
  50
  51 #define LP8501_REG_RESET                0x3D
  52 #define LP8501_RESET                    0xFF
  53
  54 #define LP8501_REG_PROG_MEM             0x50
  55
  56 static int lp8501_post_init_device(struct lp55xx_chip *chip)
  57 {
  58         int ret;
  59         u8 val = LP8501_DEFAULT_CFG;
  60
  61         ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
  62         if (ret)
  63                 return ret;
  64
  65         /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
  66         usleep_range(1000, 2000);
  67
  68         if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
  69                 val |= LP8501_INT_CLK;
  70
  71         val |= (chip->pdata->charge_pump_mode << LP8501_CP_MODE_SHIFT) & LP8501_CP_MODE_MASK;
  72
  73         ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
  74         if (ret)
  75                 return ret;
  76
  77         /* Power selection for each output */
  78         return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
  79                                 LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
  80 }
  81
  82 static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
  83 {
  84         /* stop engine */
  85         if (!start) {
  86                 lp55xx_stop_all_engine(chip);
  87                 lp55xx_turn_off_channels(chip);
  88                 return;
  89         }
  90
  91         lp55xx_run_engine_common(chip);
  92 }
  93
  94 /* Chip specific configurations */
  95 static struct lp55xx_device_config lp8501_cfg = {
  96         .reg_op_mode = {
  97                 .addr = LP8501_REG_OP_MODE,
  98         },
  99         .reg_exec = {
 100                 .addr = LP8501_REG_ENABLE,
 101         },
 102         .engine_busy = {
 103                 .addr = LP8501_REG_STATUS,
 104                 .mask = LP8501_ENGINE_BUSY,
 105         },
 106         .reset = {
 107                 .addr = LP8501_REG_RESET,
 108                 .val  = LP8501_RESET,
 109         },
 110         .enable = {
 111                 .addr = LP8501_REG_ENABLE,
 112                 .val  = LP8501_ENABLE,
 113         },
 114         .prog_mem_base = {
 115                 .addr = LP8501_REG_PROG_MEM,
 116         },
 117         .reg_led_pwm_base = {
 118                 .addr = LP8501_REG_LED_PWM_BASE,
 119         },
 120         .reg_led_current_base = {
 121                 .addr = LP8501_REG_LED_CURRENT_BASE,
 122         },
 123         .pages_per_engine   = LP8501_PAGES_PER_ENGINE,
 124         .max_channel  = LP8501_MAX_LEDS,
 125         .post_init_device   = lp8501_post_init_device,
 126         .brightness_fn      = lp55xx_led_brightness,
 127         .set_led_current    = lp55xx_set_led_current,
 128         .firmware_cb        = lp55xx_firmware_loaded_cb,
 129         .run_engine         = lp8501_run_engine,
 130 };
 131
 132 static const struct i2c_device_id lp8501_id[] = {
 133         { "lp8501",  .driver_data = (kernel_ulong_t)&lp8501_cfg, },
 134         { }
 135 };
 136 MODULE_DEVICE_TABLE(i2c, lp8501_id);
 137
 138 static const struct of_device_id of_lp8501_leds_match[] = {
 139         { .compatible = "ti,lp8501", .data = &lp8501_cfg, },
 140         {},
 141 };
 142
 143 MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
 144
 145 static struct i2c_driver lp8501_driver = {
 146         .driver = {
 147                 .name   = "lp8501",
 148                 .of_match_table = of_lp8501_leds_match,
 149         },
 150         .probe          = lp55xx_probe,
 151         .remove         = lp55xx_remove,
 152         .id_table       = lp8501_id,
 153 };
 154
 155 module_i2c_driver(lp8501_driver);
 156
 157 MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
 158 MODULE_AUTHOR("Milo Kim");
 159 MODULE_LICENSE("GPL");