408 строки
9.3 KiB
C
408 строки
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* TI LP8501 9 channel 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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#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/of.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 LP8501_PROGRAM_LENGTH 32
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#define LP8501_MAX_LEDS 9
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/* Registers */
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#define LP8501_REG_ENABLE 0x00
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#define LP8501_ENABLE BIT(6)
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#define LP8501_EXEC_M 0x3F
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#define LP8501_EXEC_ENG1_M 0x30
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#define LP8501_EXEC_ENG2_M 0x0C
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#define LP8501_EXEC_ENG3_M 0x03
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#define LP8501_RUN_ENG1 0x20
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#define LP8501_RUN_ENG2 0x08
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#define LP8501_RUN_ENG3 0x02
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#define LP8501_REG_OP_MODE 0x01
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#define LP8501_MODE_ENG1_M 0x30
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#define LP8501_MODE_ENG2_M 0x0C
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#define LP8501_MODE_ENG3_M 0x03
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#define LP8501_LOAD_ENG1 0x10
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#define LP8501_LOAD_ENG2 0x04
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#define LP8501_LOAD_ENG3 0x01
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#define LP8501_REG_PWR_CONFIG 0x05
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#define LP8501_PWR_CONFIG_M 0x03
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#define LP8501_REG_LED_PWM_BASE 0x16
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#define LP8501_REG_LED_CURRENT_BASE 0x26
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#define LP8501_REG_CONFIG 0x36
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#define LP8501_PWM_PSAVE BIT(7)
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#define LP8501_AUTO_INC BIT(6)
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#define LP8501_PWR_SAVE BIT(5)
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#define LP8501_CP_AUTO 0x18
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#define LP8501_INT_CLK BIT(0)
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#define LP8501_DEFAULT_CFG \
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(LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE | LP8501_CP_AUTO)
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#define LP8501_REG_RESET 0x3D
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#define LP8501_RESET 0xFF
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#define LP8501_REG_PROG_PAGE_SEL 0x4F
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#define LP8501_PAGE_ENG1 0
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#define LP8501_PAGE_ENG2 1
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#define LP8501_PAGE_ENG3 2
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#define LP8501_REG_PROG_MEM 0x50
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#define LP8501_ENG1_IS_LOADING(mode) \
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((mode & LP8501_MODE_ENG1_M) == LP8501_LOAD_ENG1)
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#define LP8501_ENG2_IS_LOADING(mode) \
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((mode & LP8501_MODE_ENG2_M) == LP8501_LOAD_ENG2)
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#define LP8501_ENG3_IS_LOADING(mode) \
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((mode & LP8501_MODE_ENG3_M) == LP8501_LOAD_ENG3)
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static inline void lp8501_wait_opmode_done(void)
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{
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usleep_range(1000, 2000);
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}
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static void lp8501_set_led_current(struct lp55xx_led *led, u8 led_current)
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{
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led->led_current = led_current;
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lp55xx_write(led->chip, LP8501_REG_LED_CURRENT_BASE + led->chan_nr,
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led_current);
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}
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static int lp8501_post_init_device(struct lp55xx_chip *chip)
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{
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int ret;
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u8 val = LP8501_DEFAULT_CFG;
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ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
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if (ret)
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return ret;
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/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
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usleep_range(1000, 2000);
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if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
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val |= LP8501_INT_CLK;
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ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
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if (ret)
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return ret;
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/* Power selection for each output */
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return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
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LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
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}
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static void lp8501_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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static const u8 mask[] = {
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[LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M,
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[LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M,
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[LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M,
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};
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static const u8 val[] = {
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[LP55XX_ENGINE_1] = LP8501_LOAD_ENG1,
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[LP55XX_ENGINE_2] = LP8501_LOAD_ENG2,
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[LP55XX_ENGINE_3] = LP8501_LOAD_ENG3,
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};
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static const u8 page_sel[] = {
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[LP55XX_ENGINE_1] = LP8501_PAGE_ENG1,
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[LP55XX_ENGINE_2] = LP8501_PAGE_ENG2,
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[LP55XX_ENGINE_3] = LP8501_PAGE_ENG3,
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};
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lp55xx_update_bits(chip, LP8501_REG_OP_MODE, mask[idx], val[idx]);
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lp8501_wait_opmode_done();
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lp55xx_write(chip, LP8501_REG_PROG_PAGE_SEL, page_sel[idx]);
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}
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static void lp8501_stop_engine(struct lp55xx_chip *chip)
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{
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lp55xx_write(chip, LP8501_REG_OP_MODE, 0);
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lp8501_wait_opmode_done();
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}
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static void lp8501_turn_off_channels(struct lp55xx_chip *chip)
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{
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int i;
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for (i = 0; i < LP8501_MAX_LEDS; i++)
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lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + i, 0);
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}
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static void lp8501_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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lp8501_stop_engine(chip);
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lp8501_turn_off_channels(chip);
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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, LP8501_REG_OP_MODE, &mode);
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if (ret)
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return;
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ret = lp55xx_read(chip, LP8501_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 (LP8501_ENG1_IS_LOADING(mode)) {
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mode = (mode & ~LP8501_MODE_ENG1_M) | LP8501_RUN_ENG1;
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exec = (exec & ~LP8501_EXEC_ENG1_M) | LP8501_RUN_ENG1;
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}
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if (LP8501_ENG2_IS_LOADING(mode)) {
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mode = (mode & ~LP8501_MODE_ENG2_M) | LP8501_RUN_ENG2;
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exec = (exec & ~LP8501_EXEC_ENG2_M) | LP8501_RUN_ENG2;
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}
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if (LP8501_ENG3_IS_LOADING(mode)) {
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mode = (mode & ~LP8501_MODE_ENG3_M) | LP8501_RUN_ENG3;
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exec = (exec & ~LP8501_EXEC_ENG3_M) | LP8501_RUN_ENG3;
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}
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lp55xx_write(chip, LP8501_REG_OP_MODE, mode);
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lp8501_wait_opmode_done();
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lp55xx_update_bits(chip, LP8501_REG_ENABLE, LP8501_EXEC_M, exec);
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}
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static int lp8501_update_program_memory(struct lp55xx_chip *chip,
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const u8 *data, size_t size)
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{
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u8 pattern[LP8501_PROGRAM_LENGTH] = {0};
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unsigned cmd;
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char c[3];
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int update_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 < LP8501_PROGRAM_LENGTH; i++)
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lp55xx_write(chip, LP8501_REG_PROG_MEM + i, 0);
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i = 0;
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while ((offset < size - 1) && (i < LP8501_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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update_size = i;
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for (i = 0; i < update_size; i++)
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lp55xx_write(chip, LP8501_REG_PROG_MEM + 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 lp8501_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 > LP8501_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 memory 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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lp8501_load_engine(chip);
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lp8501_update_program_memory(chip, fw->data, fw->size);
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}
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static int lp8501_led_brightness(struct lp55xx_led *led)
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{
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struct lp55xx_chip *chip = led->chip;
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int ret;
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mutex_lock(&chip->lock);
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ret = lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + led->chan_nr,
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led->brightness);
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mutex_unlock(&chip->lock);
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return ret;
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}
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/* Chip specific configurations */
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static struct lp55xx_device_config lp8501_cfg = {
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.reset = {
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.addr = LP8501_REG_RESET,
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.val = LP8501_RESET,
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},
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.enable = {
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.addr = LP8501_REG_ENABLE,
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.val = LP8501_ENABLE,
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},
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.max_channel = LP8501_MAX_LEDS,
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.post_init_device = lp8501_post_init_device,
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.brightness_fn = lp8501_led_brightness,
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.set_led_current = lp8501_set_led_current,
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.firmware_cb = lp8501_firmware_loaded,
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.run_engine = lp8501_run_engine,
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};
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static int lp8501_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct lp55xx_chip *chip;
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struct lp55xx_led *led;
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struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);
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struct device_node *np = client->dev.of_node;
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if (!pdata) {
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if (np) {
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pdata = lp55xx_of_populate_pdata(&client->dev, np);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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} else {
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dev_err(&client->dev, "no platform data\n");
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return -EINVAL;
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}
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}
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chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
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if (!chip)
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return -ENOMEM;
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led = devm_kcalloc(&client->dev,
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pdata->num_channels, sizeof(*led), GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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chip->cl = client;
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chip->pdata = pdata;
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chip->cfg = &lp8501_cfg;
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mutex_init(&chip->lock);
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i2c_set_clientdata(client, led);
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ret = lp55xx_init_device(chip);
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if (ret)
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goto err_init;
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dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
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ret = lp55xx_register_leds(led, chip);
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if (ret)
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goto err_register_leds;
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ret = lp55xx_register_sysfs(chip);
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if (ret) {
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dev_err(&client->dev, "registering sysfs failed\n");
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goto err_register_sysfs;
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}
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return 0;
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err_register_sysfs:
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lp55xx_unregister_leds(led, chip);
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err_register_leds:
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lp55xx_deinit_device(chip);
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err_init:
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return ret;
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}
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static int lp8501_remove(struct i2c_client *client)
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{
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struct lp55xx_led *led = i2c_get_clientdata(client);
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struct lp55xx_chip *chip = led->chip;
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lp8501_stop_engine(chip);
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lp55xx_unregister_sysfs(chip);
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lp55xx_unregister_leds(led, chip);
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lp55xx_deinit_device(chip);
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return 0;
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}
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static const struct i2c_device_id lp8501_id[] = {
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{ "lp8501", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lp8501_id);
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#ifdef CONFIG_OF
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static const struct of_device_id of_lp8501_leds_match[] = {
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{ .compatible = "ti,lp8501", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
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#endif
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static struct i2c_driver lp8501_driver = {
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.driver = {
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.name = "lp8501",
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.of_match_table = of_match_ptr(of_lp8501_leds_match),
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},
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.probe = lp8501_probe,
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.remove = lp8501_remove,
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.id_table = lp8501_id,
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};
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module_i2c_driver(lp8501_driver);
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MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
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MODULE_AUTHOR("Milo Kim");
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MODULE_LICENSE("GPL");
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