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594 lines
14 KiB
C
594 lines
14 KiB
C
![]() |
/*
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* LP5562 LED driver
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*
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* Copyright (C) 2013 Texas Instruments
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*
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* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/firmware.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_data/leds-lp55xx.h>
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#include <linux/slab.h>
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#include "leds-lp55xx-common.h"
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#define LP5562_PROGRAM_LENGTH 32
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#define LP5562_MAX_LEDS 4
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/* ENABLE Register 00h */
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#define LP5562_REG_ENABLE 0x00
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#define LP5562_EXEC_ENG1_M 0x30
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#define LP5562_EXEC_ENG2_M 0x0C
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#define LP5562_EXEC_ENG3_M 0x03
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#define LP5562_EXEC_M 0x3F
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#define LP5562_MASTER_ENABLE 0x40 /* Chip master enable */
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#define LP5562_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
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#define LP5562_EXEC_RUN 0x2A
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#define LP5562_ENABLE_DEFAULT \
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(LP5562_MASTER_ENABLE | LP5562_LOGARITHMIC_PWM)
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#define LP5562_ENABLE_RUN_PROGRAM \
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(LP5562_ENABLE_DEFAULT | LP5562_EXEC_RUN)
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/* OPMODE Register 01h */
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#define LP5562_REG_OP_MODE 0x01
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#define LP5562_MODE_ENG1_M 0x30
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#define LP5562_MODE_ENG2_M 0x0C
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#define LP5562_MODE_ENG3_M 0x03
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#define LP5562_LOAD_ENG1 0x10
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#define LP5562_LOAD_ENG2 0x04
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#define LP5562_LOAD_ENG3 0x01
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#define LP5562_RUN_ENG1 0x20
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#define LP5562_RUN_ENG2 0x08
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#define LP5562_RUN_ENG3 0x02
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#define LP5562_ENG1_IS_LOADING(mode) \
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((mode & LP5562_MODE_ENG1_M) == LP5562_LOAD_ENG1)
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#define LP5562_ENG2_IS_LOADING(mode) \
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((mode & LP5562_MODE_ENG2_M) == LP5562_LOAD_ENG2)
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#define LP5562_ENG3_IS_LOADING(mode) \
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((mode & LP5562_MODE_ENG3_M) == LP5562_LOAD_ENG3)
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/* BRIGHTNESS Registers */
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#define LP5562_REG_R_PWM 0x04
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#define LP5562_REG_G_PWM 0x03
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#define LP5562_REG_B_PWM 0x02
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#define LP5562_REG_W_PWM 0x0E
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/* CURRENT Registers */
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#define LP5562_REG_R_CURRENT 0x07
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#define LP5562_REG_G_CURRENT 0x06
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#define LP5562_REG_B_CURRENT 0x05
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#define LP5562_REG_W_CURRENT 0x0F
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/* CONFIG Register 08h */
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#define LP5562_REG_CONFIG 0x08
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#define LP5562_DEFAULT_CFG \
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(LP5562_PWM_HF | LP5562_PWRSAVE_EN | LP5562_CLK_INT)
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/* RESET Register 0Dh */
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#define LP5562_REG_RESET 0x0D
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#define LP5562_RESET 0xFF
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/* PROGRAM ENGINE Registers */
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#define LP5562_REG_PROG_MEM_ENG1 0x10
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#define LP5562_REG_PROG_MEM_ENG2 0x30
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#define LP5562_REG_PROG_MEM_ENG3 0x50
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/* LEDMAP Register 70h */
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#define LP5562_REG_ENG_SEL 0x70
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#define LP5562_ENG_SEL_PWM 0
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#define LP5562_ENG_FOR_RGB_M 0x3F
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#define LP5562_ENG_SEL_RGB 0x1B /* R:ENG1, G:ENG2, B:ENG3 */
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#define LP5562_ENG_FOR_W_M 0xC0
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#define LP5562_ENG1_FOR_W 0x40 /* W:ENG1 */
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#define LP5562_ENG2_FOR_W 0x80 /* W:ENG2 */
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#define LP5562_ENG3_FOR_W 0xC0 /* W:ENG3 */
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/* Program Commands */
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#define LP5562_CMD_DISABLE 0x00
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#define LP5562_CMD_LOAD 0x15
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#define LP5562_CMD_RUN 0x2A
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#define LP5562_CMD_DIRECT 0x3F
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#define LP5562_PATTERN_OFF 0
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static inline void lp5562_wait_opmode_done(void)
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{
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/* operation mode change needs to be longer than 153 us */
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usleep_range(200, 300);
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}
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static inline void lp5562_wait_enable_done(void)
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{
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/* it takes more 488 us to update ENABLE register */
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usleep_range(500, 600);
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}
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static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
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{
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u8 addr[] = {
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LP5562_REG_R_CURRENT,
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LP5562_REG_G_CURRENT,
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LP5562_REG_B_CURRENT,
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LP5562_REG_W_CURRENT,
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};
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led->led_current = led_current;
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lp55xx_write(led->chip, addr[led->chan_nr], led_current);
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}
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static void lp5562_load_engine(struct lp55xx_chip *chip)
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{
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enum lp55xx_engine_index idx = chip->engine_idx;
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u8 mask[] = {
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[LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M,
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[LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M,
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[LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M,
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};
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u8 val[] = {
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[LP55XX_ENGINE_1] = LP5562_LOAD_ENG1,
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[LP55XX_ENGINE_2] = LP5562_LOAD_ENG2,
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[LP55XX_ENGINE_3] = LP5562_LOAD_ENG3,
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};
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lp55xx_update_bits(chip, LP5562_REG_OP_MODE, mask[idx], val[idx]);
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lp5562_wait_opmode_done();
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}
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static void lp5562_stop_engine(struct lp55xx_chip *chip)
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{
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lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE);
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lp5562_wait_opmode_done();
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}
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static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
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{
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int ret;
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u8 mode;
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u8 exec;
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/* stop engine */
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if (!start) {
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lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
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lp5562_wait_enable_done();
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lp5562_stop_engine(chip);
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lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
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lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
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lp5562_wait_opmode_done();
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return;
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}
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/*
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* To run the engine,
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* operation mode and enable register should updated at the same time
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*/
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ret = lp55xx_read(chip, LP5562_REG_OP_MODE, &mode);
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if (ret)
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return;
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ret = lp55xx_read(chip, LP5562_REG_ENABLE, &exec);
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if (ret)
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return;
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/* change operation mode to RUN only when each engine is loading */
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if (LP5562_ENG1_IS_LOADING(mode)) {
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mode = (mode & ~LP5562_MODE_ENG1_M) | LP5562_RUN_ENG1;
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exec = (exec & ~LP5562_EXEC_ENG1_M) | LP5562_RUN_ENG1;
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}
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if (LP5562_ENG2_IS_LOADING(mode)) {
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mode = (mode & ~LP5562_MODE_ENG2_M) | LP5562_RUN_ENG2;
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exec = (exec & ~LP5562_EXEC_ENG2_M) | LP5562_RUN_ENG2;
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}
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if (LP5562_ENG3_IS_LOADING(mode)) {
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mode = (mode & ~LP5562_MODE_ENG3_M) | LP5562_RUN_ENG3;
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exec = (exec & ~LP5562_EXEC_ENG3_M) | LP5562_RUN_ENG3;
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}
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lp55xx_write(chip, LP5562_REG_OP_MODE, mode);
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lp5562_wait_opmode_done();
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lp55xx_update_bits(chip, LP5562_REG_ENABLE, LP5562_EXEC_M, exec);
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lp5562_wait_enable_done();
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}
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static int lp5562_update_firmware(struct lp55xx_chip *chip,
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const u8 *data, size_t size)
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{
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enum lp55xx_engine_index idx = chip->engine_idx;
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u8 pattern[LP5562_PROGRAM_LENGTH] = {0};
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u8 addr[] = {
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[LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1,
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[LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2,
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[LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3,
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};
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unsigned cmd;
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char c[3];
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int program_size;
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int nrchars;
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int offset = 0;
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int ret;
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int i;
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/* clear program memory before updating */
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for (i = 0; i < LP5562_PROGRAM_LENGTH; i++)
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lp55xx_write(chip, addr[idx] + i, 0);
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i = 0;
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while ((offset < size - 1) && (i < LP5562_PROGRAM_LENGTH)) {
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/* separate sscanfs because length is working only for %s */
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ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
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if (ret != 1)
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goto err;
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ret = sscanf(c, "%2x", &cmd);
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if (ret != 1)
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goto err;
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pattern[i] = (u8)cmd;
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offset += nrchars;
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i++;
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}
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/* Each instruction is 16bit long. Check that length is even */
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if (i % 2)
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goto err;
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program_size = i;
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for (i = 0; i < program_size; i++)
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lp55xx_write(chip, addr[idx] + i, pattern[i]);
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return 0;
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err:
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dev_err(&chip->cl->dev, "wrong pattern format\n");
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return -EINVAL;
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}
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static void lp5562_firmware_loaded(struct lp55xx_chip *chip)
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{
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const struct firmware *fw = chip->fw;
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if (fw->size > LP5562_PROGRAM_LENGTH) {
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dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
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fw->size);
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return;
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}
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/*
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* Program momery sequence
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* 1) set engine mode to "LOAD"
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* 2) write firmware data into program memory
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*/
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lp5562_load_engine(chip);
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lp5562_update_firmware(chip, fw->data, fw->size);
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}
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static int lp5562_post_init_device(struct lp55xx_chip *chip)
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{
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int ret;
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u8 update_cfg = chip->pdata->update_config ? : LP5562_DEFAULT_CFG;
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/* Set all PWMs to direct control mode */
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ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
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if (ret)
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return ret;
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lp5562_wait_opmode_done();
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ret = lp55xx_write(chip, LP5562_REG_CONFIG, update_cfg);
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if (ret)
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return ret;
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/* Initialize all channels PWM to zero -> leds off */
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lp55xx_write(chip, LP5562_REG_R_PWM, 0);
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lp55xx_write(chip, LP5562_REG_G_PWM, 0);
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lp55xx_write(chip, LP5562_REG_B_PWM, 0);
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lp55xx_write(chip, LP5562_REG_W_PWM, 0);
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/* Set LED map as register PWM by default */
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lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
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return 0;
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}
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static void lp5562_led_brightness_work(struct work_struct *work)
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{
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struct lp55xx_led *led = container_of(work, struct lp55xx_led,
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brightness_work);
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struct lp55xx_chip *chip = led->chip;
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u8 addr[] = {
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LP5562_REG_R_PWM,
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LP5562_REG_G_PWM,
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LP5562_REG_B_PWM,
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LP5562_REG_W_PWM,
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};
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mutex_lock(&chip->lock);
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lp55xx_write(chip, addr[led->chan_nr], led->brightness);
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mutex_unlock(&chip->lock);
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}
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static void lp5562_write_program_memory(struct lp55xx_chip *chip,
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u8 base, const u8 *rgb, int size)
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{
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int i;
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if (!rgb || size <= 0)
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return;
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for (i = 0; i < size; i++)
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lp55xx_write(chip, base + i, *(rgb + i));
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lp55xx_write(chip, base + i, 0);
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lp55xx_write(chip, base + i + 1, 0);
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}
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/* check the size of program count */
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static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn)
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{
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return (ptn->size_r >= LP5562_PROGRAM_LENGTH ||
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ptn->size_g >= LP5562_PROGRAM_LENGTH ||
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ptn->size_b >= LP5562_PROGRAM_LENGTH);
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}
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static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
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{
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struct lp55xx_predef_pattern *ptn;
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int i;
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if (mode == LP5562_PATTERN_OFF) {
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lp5562_run_engine(chip, false);
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return 0;
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}
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ptn = chip->pdata->patterns + (mode - 1);
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if (!ptn || _is_pc_overflow(ptn)) {
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dev_err(&chip->cl->dev, "invalid pattern data\n");
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return -EINVAL;
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}
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lp5562_stop_engine(chip);
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/* Set LED map as RGB */
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lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);
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/* Load engines */
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for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
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chip->engine_idx = i;
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lp5562_load_engine(chip);
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}
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/* Clear program registers */
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lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0);
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lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0);
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lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0);
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lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0);
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lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0);
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lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0);
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/* Program engines */
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lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1,
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ptn->r, ptn->size_r);
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lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2,
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ptn->g, ptn->size_g);
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lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3,
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ptn->b, ptn->size_b);
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/* Run engines */
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lp5562_run_engine(chip, true);
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return 0;
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}
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static ssize_t lp5562_store_pattern(struct device *dev,
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||
|
struct device_attribute *attr,
|
||
|
const char *buf, size_t len)
|
||
|
{
|
||
|
struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
|
||
|
struct lp55xx_chip *chip = led->chip;
|
||
|
struct lp55xx_predef_pattern *ptn = chip->pdata->patterns;
|
||
|
int num_patterns = chip->pdata->num_patterns;
|
||
|
unsigned long mode;
|
||
|
int ret;
|
||
|
|
||
|
ret = kstrtoul(buf, 0, &mode);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
if (mode > num_patterns || !ptn)
|
||
|
return -EINVAL;
|
||
|
|
||
|
mutex_lock(&chip->lock);
|
||
|
ret = lp5562_run_predef_led_pattern(chip, mode);
|
||
|
mutex_unlock(&chip->lock);
|
||
|
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static ssize_t lp5562_store_engine_mux(struct device *dev,
|
||
|
struct device_attribute *attr,
|
||
|
const char *buf, size_t len)
|
||
|
{
|
||
|
struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
|
||
|
struct lp55xx_chip *chip = led->chip;
|
||
|
u8 mask;
|
||
|
u8 val;
|
||
|
|
||
|
/* LED map
|
||
|
* R ... Engine 1 (fixed)
|
||
|
* G ... Engine 2 (fixed)
|
||
|
* B ... Engine 3 (fixed)
|
||
|
* W ... Engine 1 or 2 or 3
|
||
|
*/
|
||
|
|
||
|
if (sysfs_streq(buf, "RGB")) {
|
||
|
mask = LP5562_ENG_FOR_RGB_M;
|
||
|
val = LP5562_ENG_SEL_RGB;
|
||
|
} else if (sysfs_streq(buf, "W")) {
|
||
|
enum lp55xx_engine_index idx = chip->engine_idx;
|
||
|
|
||
|
mask = LP5562_ENG_FOR_W_M;
|
||
|
switch (idx) {
|
||
|
case LP55XX_ENGINE_1:
|
||
|
val = LP5562_ENG1_FOR_W;
|
||
|
break;
|
||
|
case LP55XX_ENGINE_2:
|
||
|
val = LP5562_ENG2_FOR_W;
|
||
|
break;
|
||
|
case LP55XX_ENGINE_3:
|
||
|
val = LP5562_ENG3_FOR_W;
|
||
|
break;
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
} else {
|
||
|
dev_err(dev, "choose RGB or W\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
mutex_lock(&chip->lock);
|
||
|
lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val);
|
||
|
mutex_unlock(&chip->lock);
|
||
|
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
static DEVICE_ATTR(led_pattern, S_IWUSR, NULL, lp5562_store_pattern);
|
||
|
static DEVICE_ATTR(engine_mux, S_IWUSR, NULL, lp5562_store_engine_mux);
|
||
|
|
||
|
static struct attribute *lp5562_attributes[] = {
|
||
|
&dev_attr_led_pattern.attr,
|
||
|
&dev_attr_engine_mux.attr,
|
||
|
NULL,
|
||
|
};
|
||
|
|
||
|
static const struct attribute_group lp5562_group = {
|
||
|
.attrs = lp5562_attributes,
|
||
|
};
|
||
|
|
||
|
/* Chip specific configurations */
|
||
|
static struct lp55xx_device_config lp5562_cfg = {
|
||
|
.max_channel = LP5562_MAX_LEDS,
|
||
|
.reset = {
|
||
|
.addr = LP5562_REG_RESET,
|
||
|
.val = LP5562_RESET,
|
||
|
},
|
||
|
.enable = {
|
||
|
.addr = LP5562_REG_ENABLE,
|
||
|
.val = LP5562_ENABLE_DEFAULT,
|
||
|
},
|
||
|
.post_init_device = lp5562_post_init_device,
|
||
|
.set_led_current = lp5562_set_led_current,
|
||
|
.brightness_work_fn = lp5562_led_brightness_work,
|
||
|
.run_engine = lp5562_run_engine,
|
||
|
.firmware_cb = lp5562_firmware_loaded,
|
||
|
.dev_attr_group = &lp5562_group,
|
||
|
};
|
||
|
|
||
|
static int lp5562_probe(struct i2c_client *client,
|
||
|
const struct i2c_device_id *id)
|
||
|
{
|
||
|
int ret;
|
||
|
struct lp55xx_chip *chip;
|
||
|
struct lp55xx_led *led;
|
||
|
struct lp55xx_platform_data *pdata = client->dev.platform_data;
|
||
|
|
||
|
if (!pdata) {
|
||
|
dev_err(&client->dev, "no platform data\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
|
||
|
if (!chip)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
led = devm_kzalloc(&client->dev,
|
||
|
sizeof(*led) * pdata->num_channels, GFP_KERNEL);
|
||
|
if (!led)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
chip->cl = client;
|
||
|
chip->pdata = pdata;
|
||
|
chip->cfg = &lp5562_cfg;
|
||
|
|
||
|
mutex_init(&chip->lock);
|
||
|
|
||
|
i2c_set_clientdata(client, led);
|
||
|
|
||
|
ret = lp55xx_init_device(chip);
|
||
|
if (ret)
|
||
|
goto err_init;
|
||
|
|
||
|
ret = lp55xx_register_leds(led, chip);
|
||
|
if (ret)
|
||
|
goto err_register_leds;
|
||
|
|
||
|
ret = lp55xx_register_sysfs(chip);
|
||
|
if (ret) {
|
||
|
dev_err(&client->dev, "registering sysfs failed\n");
|
||
|
goto err_register_sysfs;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
err_register_sysfs:
|
||
|
lp55xx_unregister_leds(led, chip);
|
||
|
err_register_leds:
|
||
|
lp55xx_deinit_device(chip);
|
||
|
err_init:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int lp5562_remove(struct i2c_client *client)
|
||
|
{
|
||
|
struct lp55xx_led *led = i2c_get_clientdata(client);
|
||
|
struct lp55xx_chip *chip = led->chip;
|
||
|
|
||
|
lp5562_stop_engine(chip);
|
||
|
|
||
|
lp55xx_unregister_sysfs(chip);
|
||
|
lp55xx_unregister_leds(led, chip);
|
||
|
lp55xx_deinit_device(chip);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static const struct i2c_device_id lp5562_id[] = {
|
||
|
{ "lp5562", 0 },
|
||
|
{ }
|
||
|
};
|
||
|
MODULE_DEVICE_TABLE(i2c, lp5562_id);
|
||
|
|
||
|
static struct i2c_driver lp5562_driver = {
|
||
|
.driver = {
|
||
|
.name = "lp5562",
|
||
|
},
|
||
|
.probe = lp5562_probe,
|
||
|
.remove = lp5562_remove,
|
||
|
.id_table = lp5562_id,
|
||
|
};
|
||
|
|
||
|
module_i2c_driver(lp5562_driver);
|
||
|
|
||
|
MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver");
|
||
|
MODULE_AUTHOR("Milo Kim");
|
||
|
MODULE_LICENSE("GPL");
|