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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * TI LP8501 9 channel LED Driver4 *5 * Copyright (C) 2013 Texas Instruments6 *7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>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 124#define LP8501_MAX_LEDS 925 26/* Registers */27#define LP8501_REG_ENABLE 0x0028#define LP8501_ENABLE BIT(6)29 30#define LP8501_REG_OP_MODE 0x0131 32#define LP8501_REG_PWR_CONFIG 0x0533#define LP8501_PWR_CONFIG_M 0x0334 35#define LP8501_REG_LED_PWM_BASE 0x1636 37#define LP8501_REG_LED_CURRENT_BASE 0x2638 39#define LP8501_REG_CONFIG 0x3640#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 0x1844#define LP8501_CP_MODE_SHIFT 345#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 0x3A49#define LP8501_ENGINE_BUSY BIT(4)50 51#define LP8501_REG_RESET 0x3D52#define LP8501_RESET 0xFF53 54#define LP8501_REG_PROG_MEM 0x5055 56static 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 82static 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 */95static 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 132static const struct i2c_device_id lp8501_id[] = {133 { "lp8501", .driver_data = (kernel_ulong_t)&lp8501_cfg, },134 { }135};136MODULE_DEVICE_TABLE(i2c, lp8501_id);137 138static const struct of_device_id of_lp8501_leds_match[] = {139 { .compatible = "ti,lp8501", .data = &lp8501_cfg, },140 {},141};142 143MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);144 145static 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 155module_i2c_driver(lp8501_driver);156 157MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");158MODULE_AUTHOR("Milo Kim");159MODULE_LICENSE("GPL");160