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618 lines
15 KiB
618 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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/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 LP5562_PROGRAM_LENGTH 32 |
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#define LP5562_MAX_LEDS 4 |
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|
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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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|
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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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|
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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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|
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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_PWM_HF 0x40 |
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#define LP5562_PWRSAVE_EN 0x20 |
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#define LP5562_CLK_INT 0x01 /* Internal clock */ |
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#define LP5562_DEFAULT_CFG (LP5562_PWM_HF | LP5562_PWRSAVE_EN) |
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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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|
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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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static const 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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static const 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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static const 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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static const 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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/* |
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* the firmware is encoded in ascii hex character, with 2 chars |
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* per byte |
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*/ |
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if (fw->size > (LP5562_PROGRAM_LENGTH * 2)) { |
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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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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 cfg = 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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/* Update configuration for the clock setting */ |
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if (!lp55xx_is_extclk_used(chip)) |
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cfg |= LP5562_CLK_INT; |
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ret = lp55xx_write(chip, LP5562_REG_CONFIG, 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 int lp5562_led_brightness(struct lp55xx_led *led) |
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{ |
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struct lp55xx_chip *chip = led->chip; |
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static const 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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int ret; |
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mutex_lock(&chip->lock); |
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ret = lp55xx_write(chip, addr[led->chan_nr], led->brightness); |
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mutex_unlock(&chip->lock); |
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return ret; |
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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, |
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const char *buf, size_t len) |
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{ |
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struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
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struct lp55xx_chip *chip = led->chip; |
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struct lp55xx_predef_pattern *ptn = chip->pdata->patterns; |
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int num_patterns = chip->pdata->num_patterns; |
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unsigned long mode; |
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int ret; |
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ret = kstrtoul(buf, 0, &mode); |
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if (ret) |
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return ret; |
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if (mode > num_patterns || !ptn) |
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return -EINVAL; |
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mutex_lock(&chip->lock); |
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ret = lp5562_run_predef_led_pattern(chip, mode); |
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mutex_unlock(&chip->lock); |
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if (ret) |
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return ret; |
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return len; |
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} |
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static ssize_t lp5562_store_engine_mux(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); |
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struct lp55xx_chip *chip = led->chip; |
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u8 mask; |
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u8 val; |
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/* LED map |
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* R ... Engine 1 (fixed) |
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* G ... Engine 2 (fixed) |
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* B ... Engine 3 (fixed) |
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* W ... Engine 1 or 2 or 3 |
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*/ |
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if (sysfs_streq(buf, "RGB")) { |
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mask = LP5562_ENG_FOR_RGB_M; |
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val = LP5562_ENG_SEL_RGB; |
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} else if (sysfs_streq(buf, "W")) { |
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enum lp55xx_engine_index idx = chip->engine_idx; |
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mask = LP5562_ENG_FOR_W_M; |
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switch (idx) { |
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case LP55XX_ENGINE_1: |
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val = LP5562_ENG1_FOR_W; |
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break; |
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case LP55XX_ENGINE_2: |
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val = LP5562_ENG2_FOR_W; |
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break; |
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case LP55XX_ENGINE_3: |
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val = LP5562_ENG3_FOR_W; |
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break; |
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default: |
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return -EINVAL; |
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} |
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} else { |
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dev_err(dev, "choose RGB or W\n"); |
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return -EINVAL; |
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} |
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mutex_lock(&chip->lock); |
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lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val); |
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mutex_unlock(&chip->lock); |
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return len; |
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} |
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static LP55XX_DEV_ATTR_WO(led_pattern, lp5562_store_pattern); |
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static LP55XX_DEV_ATTR_WO(engine_mux, lp5562_store_engine_mux); |
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static struct attribute *lp5562_attributes[] = { |
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&dev_attr_led_pattern.attr, |
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&dev_attr_engine_mux.attr, |
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NULL, |
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}; |
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static const struct attribute_group lp5562_group = { |
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.attrs = lp5562_attributes, |
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}; |
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|
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/* Chip specific configurations */ |
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static struct lp55xx_device_config lp5562_cfg = { |
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.max_channel = LP5562_MAX_LEDS, |
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.reset = { |
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.addr = LP5562_REG_RESET, |
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.val = LP5562_RESET, |
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}, |
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.enable = { |
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.addr = LP5562_REG_ENABLE, |
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.val = LP5562_ENABLE_DEFAULT, |
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}, |
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.post_init_device = lp5562_post_init_device, |
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.set_led_current = lp5562_set_led_current, |
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.brightness_fn = lp5562_led_brightness, |
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.run_engine = lp5562_run_engine, |
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.firmware_cb = lp5562_firmware_loaded, |
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.dev_attr_group = &lp5562_group, |
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}; |
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static int lp5562_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 = dev_of_node(&client->dev); |
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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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chip->cfg = &lp5562_cfg; |
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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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chip); |
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if (IS_ERR(pdata)) |
|
return PTR_ERR(pdata); |
|
} else { |
|
dev_err(&client->dev, "no platform data\n"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
|
|
led = devm_kcalloc(&client->dev, |
|
pdata->num_channels, sizeof(*led), GFP_KERNEL); |
|
if (!led) |
|
return -ENOMEM; |
|
|
|
chip->cl = client; |
|
chip->pdata = pdata; |
|
|
|
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_out; |
|
|
|
ret = lp55xx_register_sysfs(chip); |
|
if (ret) { |
|
dev_err(&client->dev, "registering sysfs failed\n"); |
|
goto err_out; |
|
} |
|
|
|
return 0; |
|
|
|
err_out: |
|
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_deinit_device(chip); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id lp5562_id[] = { |
|
{ "lp5562", 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, lp5562_id); |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id of_lp5562_leds_match[] = { |
|
{ .compatible = "ti,lp5562", }, |
|
{}, |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(of, of_lp5562_leds_match); |
|
#endif |
|
|
|
static struct i2c_driver lp5562_driver = { |
|
.driver = { |
|
.name = "lp5562", |
|
.of_match_table = of_match_ptr(of_lp5562_leds_match), |
|
}, |
|
.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");
|
|
|