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623 lines
15 KiB
623 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* LP5521 LED chip driver. |
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* |
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* Copyright (C) 2010 Nokia Corporation |
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* Copyright (C) 2012 Texas Instruments |
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* |
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* Contact: Samu Onkalo <[email protected]> |
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* Milo(Woogyom) Kim <[email protected]> |
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*/ |
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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/platform_data/leds-lp55xx.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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|
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#include "leds-lp55xx-common.h" |
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|
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#define LP5521_PROGRAM_LENGTH 32 |
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#define LP5521_MAX_LEDS 3 |
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#define LP5521_CMD_DIRECT 0x3F |
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|
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/* Registers */ |
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#define LP5521_REG_ENABLE 0x00 |
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#define LP5521_REG_OP_MODE 0x01 |
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#define LP5521_REG_R_PWM 0x02 |
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#define LP5521_REG_G_PWM 0x03 |
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#define LP5521_REG_B_PWM 0x04 |
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#define LP5521_REG_R_CURRENT 0x05 |
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#define LP5521_REG_G_CURRENT 0x06 |
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#define LP5521_REG_B_CURRENT 0x07 |
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#define LP5521_REG_CONFIG 0x08 |
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#define LP5521_REG_STATUS 0x0C |
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#define LP5521_REG_RESET 0x0D |
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#define LP5521_REG_R_PROG_MEM 0x10 |
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#define LP5521_REG_G_PROG_MEM 0x30 |
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#define LP5521_REG_B_PROG_MEM 0x50 |
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|
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/* Base register to set LED current */ |
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#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT |
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/* Base register to set the brightness */ |
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#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM |
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|
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/* Bits in ENABLE register */ |
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#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */ |
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#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */ |
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#define LP5521_EXEC_RUN 0x2A |
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#define LP5521_ENABLE_DEFAULT \ |
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(LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM) |
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#define LP5521_ENABLE_RUN_PROGRAM \ |
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(LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN) |
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|
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/* CONFIG register */ |
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#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */ |
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#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */ |
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#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */ |
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#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */ |
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#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */ |
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#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */ |
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#define LP5521_R_TO_BATT 0x04 /* R out: 0 = CP, 1 = Vbat */ |
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#define LP5521_CLK_INT 0x01 /* Internal clock */ |
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#define LP5521_DEFAULT_CFG \ |
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(LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO) |
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|
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/* Status */ |
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#define LP5521_EXT_CLK_USED 0x08 |
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|
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/* default R channel current register value */ |
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#define LP5521_REG_R_CURR_DEFAULT 0xAF |
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|
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/* Reset register value */ |
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#define LP5521_RESET 0xFF |
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|
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/* Program Memory Operations */ |
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#define LP5521_MODE_R_M 0x30 /* Operation Mode Register */ |
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#define LP5521_MODE_G_M 0x0C |
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#define LP5521_MODE_B_M 0x03 |
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#define LP5521_LOAD_R 0x10 |
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#define LP5521_LOAD_G 0x04 |
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#define LP5521_LOAD_B 0x01 |
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|
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#define LP5521_R_IS_LOADING(mode) \ |
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((mode & LP5521_MODE_R_M) == LP5521_LOAD_R) |
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#define LP5521_G_IS_LOADING(mode) \ |
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((mode & LP5521_MODE_G_M) == LP5521_LOAD_G) |
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#define LP5521_B_IS_LOADING(mode) \ |
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((mode & LP5521_MODE_B_M) == LP5521_LOAD_B) |
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|
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#define LP5521_EXEC_R_M 0x30 /* Enable Register */ |
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#define LP5521_EXEC_G_M 0x0C |
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#define LP5521_EXEC_B_M 0x03 |
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#define LP5521_EXEC_M 0x3F |
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#define LP5521_RUN_R 0x20 |
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#define LP5521_RUN_G 0x08 |
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#define LP5521_RUN_B 0x02 |
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|
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static inline void lp5521_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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|
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static inline void lp5521_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 lp5521_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, LP5521_REG_LED_CURRENT_BASE + led->chan_nr, |
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led_current); |
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} |
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static void lp5521_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] = LP5521_MODE_R_M, |
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[LP55XX_ENGINE_2] = LP5521_MODE_G_M, |
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[LP55XX_ENGINE_3] = LP5521_MODE_B_M, |
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}; |
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static const u8 val[] = { |
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[LP55XX_ENGINE_1] = LP5521_LOAD_R, |
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[LP55XX_ENGINE_2] = LP5521_LOAD_G, |
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[LP55XX_ENGINE_3] = LP5521_LOAD_B, |
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}; |
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lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]); |
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lp5521_wait_opmode_done(); |
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} |
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|
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static void lp5521_stop_all_engines(struct lp55xx_chip *chip) |
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{ |
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lp55xx_write(chip, LP5521_REG_OP_MODE, 0); |
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lp5521_wait_opmode_done(); |
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} |
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|
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static void lp5521_stop_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] = LP5521_MODE_R_M, |
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[LP55XX_ENGINE_2] = LP5521_MODE_G_M, |
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[LP55XX_ENGINE_3] = LP5521_MODE_B_M, |
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}; |
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lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0); |
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lp5521_wait_opmode_done(); |
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} |
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static void lp5521_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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lp5521_stop_engine(chip); |
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lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); |
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lp5521_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, LP5521_REG_OP_MODE, &mode); |
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if (ret) |
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return; |
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ret = lp55xx_read(chip, LP5521_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 (LP5521_R_IS_LOADING(mode)) { |
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mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R; |
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exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R; |
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} |
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if (LP5521_G_IS_LOADING(mode)) { |
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mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G; |
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exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G; |
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} |
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if (LP5521_B_IS_LOADING(mode)) { |
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mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B; |
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exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B; |
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} |
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lp55xx_write(chip, LP5521_REG_OP_MODE, mode); |
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lp5521_wait_opmode_done(); |
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lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec); |
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lp5521_wait_enable_done(); |
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} |
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static int lp5521_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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enum lp55xx_engine_index idx = chip->engine_idx; |
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u8 pattern[LP5521_PROGRAM_LENGTH] = {0}; |
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static const u8 addr[] = { |
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[LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM, |
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[LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM, |
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[LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM, |
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}; |
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unsigned cmd; |
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char c[3]; |
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int nrchars; |
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int ret; |
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int offset = 0; |
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int i = 0; |
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while ((offset < size - 1) && (i < LP5521_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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for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) { |
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ret = lp55xx_write(chip, addr[idx] + i, pattern[i]); |
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if (ret) |
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return -EINVAL; |
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} |
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return size; |
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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 lp5521_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 > LP5521_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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lp5521_load_engine(chip); |
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lp5521_update_program_memory(chip, fw->data, fw->size); |
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} |
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static int lp5521_post_init_device(struct lp55xx_chip *chip) |
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{ |
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int ret; |
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u8 val; |
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/* |
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* Make sure that the chip is reset by reading back the r channel |
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* current reg. This is dummy read is required on some platforms - |
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* otherwise further access to the R G B channels in the |
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* LP5521_REG_ENABLE register will not have any effect - strange! |
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*/ |
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ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val); |
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if (ret) { |
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dev_err(&chip->cl->dev, "error in resetting chip\n"); |
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return ret; |
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} |
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if (val != LP5521_REG_R_CURR_DEFAULT) { |
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dev_err(&chip->cl->dev, |
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"unexpected data in register (expected 0x%x got 0x%x)\n", |
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LP5521_REG_R_CURR_DEFAULT, val); |
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ret = -EINVAL; |
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return ret; |
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} |
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usleep_range(10000, 20000); |
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/* Set all PWMs to direct control mode */ |
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ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT); |
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/* Update configuration for the clock setting */ |
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val = LP5521_DEFAULT_CFG; |
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if (!lp55xx_is_extclk_used(chip)) |
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val |= LP5521_CLK_INT; |
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ret = lp55xx_write(chip, LP5521_REG_CONFIG, val); |
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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, LP5521_REG_R_PWM, 0); |
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lp55xx_write(chip, LP5521_REG_G_PWM, 0); |
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lp55xx_write(chip, LP5521_REG_B_PWM, 0); |
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/* Set engines are set to run state when OP_MODE enables engines */ |
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ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM); |
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if (ret) |
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return ret; |
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lp5521_wait_enable_done(); |
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return 0; |
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} |
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static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf) |
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{ |
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struct lp55xx_platform_data *pdata = chip->pdata; |
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int ret; |
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u8 status; |
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ret = lp55xx_read(chip, LP5521_REG_STATUS, &status); |
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if (ret < 0) |
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return ret; |
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if (pdata->clock_mode != LP55XX_CLOCK_EXT) |
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return 0; |
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/* Check that ext clock is really in use if requested */ |
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if ((status & LP5521_EXT_CLK_USED) == 0) |
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return -EIO; |
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return 0; |
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} |
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static int lp5521_multicolor_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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int i; |
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mutex_lock(&chip->lock); |
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for (i = 0; i < led->mc_cdev.num_colors; i++) { |
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ret = lp55xx_write(chip, |
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LP5521_REG_LED_PWM_BASE + |
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led->mc_cdev.subled_info[i].channel, |
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led->mc_cdev.subled_info[i].brightness); |
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if (ret) |
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break; |
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} |
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mutex_unlock(&chip->lock); |
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return ret; |
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} |
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static int lp5521_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, LP5521_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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static ssize_t show_engine_mode(struct device *dev, |
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struct device_attribute *attr, |
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char *buf, int nr) |
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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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enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode; |
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switch (mode) { |
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case LP55XX_ENGINE_RUN: |
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return sprintf(buf, "run\n"); |
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case LP55XX_ENGINE_LOAD: |
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return sprintf(buf, "load\n"); |
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case LP55XX_ENGINE_DISABLED: |
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default: |
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return sprintf(buf, "disabled\n"); |
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} |
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} |
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show_mode(1) |
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show_mode(2) |
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show_mode(3) |
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static ssize_t store_engine_mode(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len, int nr) |
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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_engine *engine = &chip->engines[nr - 1]; |
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mutex_lock(&chip->lock); |
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chip->engine_idx = nr; |
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if (!strncmp(buf, "run", 3)) { |
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lp5521_run_engine(chip, true); |
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engine->mode = LP55XX_ENGINE_RUN; |
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} else if (!strncmp(buf, "load", 4)) { |
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lp5521_stop_engine(chip); |
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lp5521_load_engine(chip); |
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engine->mode = LP55XX_ENGINE_LOAD; |
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} else if (!strncmp(buf, "disabled", 8)) { |
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lp5521_stop_engine(chip); |
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engine->mode = LP55XX_ENGINE_DISABLED; |
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} |
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|
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mutex_unlock(&chip->lock); |
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|
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return len; |
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} |
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store_mode(1) |
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store_mode(2) |
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store_mode(3) |
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|
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static ssize_t store_engine_load(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len, int nr) |
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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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int ret; |
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|
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mutex_lock(&chip->lock); |
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|
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chip->engine_idx = nr; |
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lp5521_load_engine(chip); |
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ret = lp5521_update_program_memory(chip, buf, len); |
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|
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mutex_unlock(&chip->lock); |
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|
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return ret; |
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} |
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store_load(1) |
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store_load(2) |
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store_load(3) |
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|
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static ssize_t lp5521_selftest(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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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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int ret; |
|
|
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mutex_lock(&chip->lock); |
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ret = lp5521_run_selftest(chip, buf); |
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mutex_unlock(&chip->lock); |
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|
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return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK"); |
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} |
|
|
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/* device attributes */ |
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static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode); |
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static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode); |
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static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode); |
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static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load); |
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static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load); |
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static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load); |
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static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest); |
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|
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static struct attribute *lp5521_attributes[] = { |
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&dev_attr_engine1_mode.attr, |
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&dev_attr_engine2_mode.attr, |
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&dev_attr_engine3_mode.attr, |
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&dev_attr_engine1_load.attr, |
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&dev_attr_engine2_load.attr, |
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&dev_attr_engine3_load.attr, |
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&dev_attr_selftest.attr, |
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NULL |
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}; |
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|
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static const struct attribute_group lp5521_group = { |
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.attrs = lp5521_attributes, |
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}; |
|
|
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/* Chip specific configurations */ |
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static struct lp55xx_device_config lp5521_cfg = { |
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.reset = { |
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.addr = LP5521_REG_RESET, |
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.val = LP5521_RESET, |
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}, |
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.enable = { |
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.addr = LP5521_REG_ENABLE, |
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.val = LP5521_ENABLE_DEFAULT, |
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}, |
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.max_channel = LP5521_MAX_LEDS, |
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.post_init_device = lp5521_post_init_device, |
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.brightness_fn = lp5521_led_brightness, |
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.multicolor_brightness_fn = lp5521_multicolor_brightness, |
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.set_led_current = lp5521_set_led_current, |
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.firmware_cb = lp5521_firmware_loaded, |
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.run_engine = lp5521_run_engine, |
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.dev_attr_group = &lp5521_group, |
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}; |
|
|
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static int lp5521_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; |
|
|
|
chip->cfg = &lp5521_cfg; |
|
|
|
if (!pdata) { |
|
if (np) { |
|
pdata = lp55xx_of_populate_pdata(&client->dev, np, |
|
chip); |
|
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; |
|
|
|
dev_info(&client->dev, "%s programmable led chip found\n", id->name); |
|
|
|
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 lp5521_remove(struct i2c_client *client) |
|
{ |
|
struct lp55xx_led *led = i2c_get_clientdata(client); |
|
struct lp55xx_chip *chip = led->chip; |
|
|
|
lp5521_stop_all_engines(chip); |
|
lp55xx_unregister_sysfs(chip); |
|
lp55xx_deinit_device(chip); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct i2c_device_id lp5521_id[] = { |
|
{ "lp5521", 0 }, /* Three channel chip */ |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, lp5521_id); |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id of_lp5521_leds_match[] = { |
|
{ .compatible = "national,lp5521", }, |
|
{}, |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(of, of_lp5521_leds_match); |
|
#endif |
|
static struct i2c_driver lp5521_driver = { |
|
.driver = { |
|
.name = "lp5521", |
|
.of_match_table = of_match_ptr(of_lp5521_leds_match), |
|
}, |
|
.probe = lp5521_probe, |
|
.remove = lp5521_remove, |
|
.id_table = lp5521_id, |
|
}; |
|
|
|
module_i2c_driver(lp5521_driver); |
|
|
|
MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo"); |
|
MODULE_AUTHOR("Milo Kim <[email protected]>"); |
|
MODULE_DESCRIPTION("LP5521 LED engine"); |
|
MODULE_LICENSE("GPL v2");
|
|
|