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|
// SPDX-License-Identifier: GPL-2.0-only
/*
* lp5523.c - LP5523, LP55231 LED Driver
*
* Copyright (C) 2010 Nokia Corporation
* Copyright (C) 2012 Texas Instruments
*
* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
* Milo(Woogyom) Kim <milo.kim@ti.com>
*/
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_data/leds-lp55xx.h>
#include <linux/slab.h>
#include "leds-lp55xx-common.h"
#define LP5523_PROGRAM_LENGTH 32 /* bytes */
/* Memory is used like this:
* 0x00 engine 1 program
* 0x10 engine 2 program
* 0x20 engine 3 program
* 0x30 engine 1 muxing info
* 0x40 engine 2 muxing info
* 0x50 engine 3 muxing info
*/
#define LP5523_MAX_LEDS 9
/* Registers */
#define LP5523_REG_ENABLE 0x00
#define LP5523_REG_OP_MODE 0x01
#define LP5523_REG_ENABLE_LEDS_MSB 0x04
#define LP5523_REG_ENABLE_LEDS_LSB 0x05
#define LP5523_REG_LED_CTRL_BASE 0x06
#define LP5523_REG_LED_PWM_BASE 0x16
#define LP5523_REG_LED_CURRENT_BASE 0x26
#define LP5523_REG_CONFIG 0x36
#define LP5523_REG_STATUS 0x3A
#define LP5523_REG_RESET 0x3D
#define LP5523_REG_LED_TEST_CTRL 0x41
#define LP5523_REG_LED_TEST_ADC 0x42
#define LP5523_REG_MASTER_FADER_BASE 0x48
#define LP5523_REG_CH1_PROG_START 0x4C
#define LP5523_REG_CH2_PROG_START 0x4D
#define LP5523_REG_CH3_PROG_START 0x4E
#define LP5523_REG_PROG_PAGE_SEL 0x4F
#define LP5523_REG_PROG_MEM 0x50
/* Bit description in registers */
#define LP5523_ENABLE 0x40
#define LP5523_AUTO_INC 0x40
#define LP5523_PWR_SAVE 0x20
#define LP5523_PWM_PWR_SAVE 0x04
#define LP5523_CP_AUTO 0x18
#define LP5523_AUTO_CLK 0x02
#define LP5523_EN_LEDTEST 0x80
#define LP5523_LEDTEST_DONE 0x80
#define LP5523_RESET 0xFF
#define LP5523_ADC_SHORTCIRC_LIM 80
#define LP5523_EXT_CLK_USED 0x08
#define LP5523_ENG_STATUS_MASK 0x07
#define LP5523_FADER_MAPPING_MASK 0xC0
#define LP5523_FADER_MAPPING_SHIFT 6
/* Memory Page Selection */
#define LP5523_PAGE_ENG1 0
#define LP5523_PAGE_ENG2 1
#define LP5523_PAGE_ENG3 2
#define LP5523_PAGE_MUX1 3
#define LP5523_PAGE_MUX2 4
#define LP5523_PAGE_MUX3 5
/* Program Memory Operations */
#define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */
#define LP5523_MODE_ENG2_M 0x0C
#define LP5523_MODE_ENG3_M 0x03
#define LP5523_LOAD_ENG1 0x10
#define LP5523_LOAD_ENG2 0x04
#define LP5523_LOAD_ENG3 0x01
#define LP5523_ENG1_IS_LOADING(mode) \
((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
#define LP5523_ENG2_IS_LOADING(mode) \
((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
#define LP5523_ENG3_IS_LOADING(mode) \
((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
#define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */
#define LP5523_EXEC_ENG2_M 0x0C
#define LP5523_EXEC_ENG3_M 0x03
#define LP5523_EXEC_M 0x3F
#define LP5523_RUN_ENG1 0x20
#define LP5523_RUN_ENG2 0x08
#define LP5523_RUN_ENG3 0x02
#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
enum lp5523_chip_id {
LP5523,
LP55231,
};
static int lp5523_init_program_engine(struct lp55xx_chip *chip);
static inline void lp5523_wait_opmode_done(void)
{
usleep_range(1000, 2000);
}
static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
{
led->led_current = led_current;
lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
led_current);
}
static int lp5523_post_init_device(struct lp55xx_chip *chip)
{
int ret;
ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
if (ret)
return ret;
/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
usleep_range(1000, 2000);
ret = lp55xx_write(chip, LP5523_REG_CONFIG,
LP5523_AUTO_INC | LP5523_PWR_SAVE |
LP5523_CP_AUTO | LP5523_AUTO_CLK |
LP5523_PWM_PWR_SAVE);
if (ret)
return ret;
/* turn on all leds */
ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
if (ret)
return ret;
ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
if (ret)
return ret;
return lp5523_init_program_engine(chip);
}
static void lp5523_load_engine(struct lp55xx_chip *chip)
{
enum lp55xx_engine_index idx = chip->engine_idx;
static const u8 mask[] = {
[LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
[LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
[LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
};
static const u8 val[] = {
[LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
[LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
[LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
};
lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
lp5523_wait_opmode_done();
}
static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
{
enum lp55xx_engine_index idx = chip->engine_idx;
static const u8 page_sel[] = {
[LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
[LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
[LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
};
lp5523_load_engine(chip);
lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
}
static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
{
lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
lp5523_wait_opmode_done();
}
static void lp5523_stop_engine(struct lp55xx_chip *chip)
{
enum lp55xx_engine_index idx = chip->engine_idx;
static const u8 mask[] = {
[LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
[LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
[LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
};
lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
lp5523_wait_opmode_done();
}
static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
{
int i;
for (i = 0; i <
|