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493 lines
12 KiB
493 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TI LP8860 4-Channel LED Driver |
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* |
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* Copyright (C) 2014 Texas Instruments |
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* |
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* Author: Dan Murphy <[email protected]> |
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*/ |
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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/regmap.h> |
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#include <linux/regulator/consumer.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/of_gpio.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/slab.h> |
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#define LP8860_DISP_CL1_BRT_MSB 0x00 |
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#define LP8860_DISP_CL1_BRT_LSB 0x01 |
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#define LP8860_DISP_CL1_CURR_MSB 0x02 |
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#define LP8860_DISP_CL1_CURR_LSB 0x03 |
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#define LP8860_CL2_BRT_MSB 0x04 |
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#define LP8860_CL2_BRT_LSB 0x05 |
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#define LP8860_CL2_CURRENT 0x06 |
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#define LP8860_CL3_BRT_MSB 0x07 |
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#define LP8860_CL3_BRT_LSB 0x08 |
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#define LP8860_CL3_CURRENT 0x09 |
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#define LP8860_CL4_BRT_MSB 0x0a |
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#define LP8860_CL4_BRT_LSB 0x0b |
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#define LP8860_CL4_CURRENT 0x0c |
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#define LP8860_CONFIG 0x0d |
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#define LP8860_STATUS 0x0e |
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#define LP8860_FAULT 0x0f |
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#define LP8860_LED_FAULT 0x10 |
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#define LP8860_FAULT_CLEAR 0x11 |
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#define LP8860_ID 0x12 |
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#define LP8860_TEMP_MSB 0x13 |
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#define LP8860_TEMP_LSB 0x14 |
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#define LP8860_DISP_LED_CURR_MSB 0x15 |
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#define LP8860_DISP_LED_CURR_LSB 0x16 |
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#define LP8860_DISP_LED_PWM_MSB 0x17 |
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#define LP8860_DISP_LED_PWM_LSB 0x18 |
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#define LP8860_EEPROM_CNTRL 0x19 |
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#define LP8860_EEPROM_UNLOCK 0x1a |
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#define LP8860_EEPROM_REG_0 0x60 |
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#define LP8860_EEPROM_REG_1 0x61 |
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#define LP8860_EEPROM_REG_2 0x62 |
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#define LP8860_EEPROM_REG_3 0x63 |
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#define LP8860_EEPROM_REG_4 0x64 |
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#define LP8860_EEPROM_REG_5 0x65 |
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#define LP8860_EEPROM_REG_6 0x66 |
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#define LP8860_EEPROM_REG_7 0x67 |
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#define LP8860_EEPROM_REG_8 0x68 |
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#define LP8860_EEPROM_REG_9 0x69 |
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#define LP8860_EEPROM_REG_10 0x6a |
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#define LP8860_EEPROM_REG_11 0x6b |
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#define LP8860_EEPROM_REG_12 0x6c |
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#define LP8860_EEPROM_REG_13 0x6d |
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#define LP8860_EEPROM_REG_14 0x6e |
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#define LP8860_EEPROM_REG_15 0x6f |
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#define LP8860_EEPROM_REG_16 0x70 |
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#define LP8860_EEPROM_REG_17 0x71 |
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#define LP8860_EEPROM_REG_18 0x72 |
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#define LP8860_EEPROM_REG_19 0x73 |
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#define LP8860_EEPROM_REG_20 0x74 |
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#define LP8860_EEPROM_REG_21 0x75 |
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#define LP8860_EEPROM_REG_22 0x76 |
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#define LP8860_EEPROM_REG_23 0x77 |
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#define LP8860_EEPROM_REG_24 0x78 |
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#define LP8860_LOCK_EEPROM 0x00 |
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#define LP8860_UNLOCK_EEPROM 0x01 |
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#define LP8860_PROGRAM_EEPROM 0x02 |
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#define LP8860_EEPROM_CODE_1 0x08 |
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#define LP8860_EEPROM_CODE_2 0xba |
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#define LP8860_EEPROM_CODE_3 0xef |
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#define LP8860_CLEAR_FAULTS 0x01 |
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#define LP8860_NAME "lp8860" |
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/** |
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* struct lp8860_led |
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* @lock: Lock for reading/writing the device |
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* @client: Pointer to the I2C client |
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* @led_dev: led class device pointer |
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* @regmap: Devices register map |
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* @eeprom_regmap: EEPROM register map |
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* @enable_gpio: VDDIO/EN gpio to enable communication interface |
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* @regulator: LED supply regulator pointer |
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*/ |
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struct lp8860_led { |
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struct mutex lock; |
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struct i2c_client *client; |
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struct led_classdev led_dev; |
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struct regmap *regmap; |
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struct regmap *eeprom_regmap; |
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struct gpio_desc *enable_gpio; |
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struct regulator *regulator; |
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}; |
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struct lp8860_eeprom_reg { |
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uint8_t reg; |
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uint8_t value; |
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}; |
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static struct lp8860_eeprom_reg lp8860_eeprom_disp_regs[] = { |
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{ LP8860_EEPROM_REG_0, 0xed }, |
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{ LP8860_EEPROM_REG_1, 0xdf }, |
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{ LP8860_EEPROM_REG_2, 0xdc }, |
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{ LP8860_EEPROM_REG_3, 0xf0 }, |
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{ LP8860_EEPROM_REG_4, 0xdf }, |
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{ LP8860_EEPROM_REG_5, 0xe5 }, |
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{ LP8860_EEPROM_REG_6, 0xf2 }, |
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{ LP8860_EEPROM_REG_7, 0x77 }, |
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{ LP8860_EEPROM_REG_8, 0x77 }, |
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{ LP8860_EEPROM_REG_9, 0x71 }, |
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{ LP8860_EEPROM_REG_10, 0x3f }, |
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{ LP8860_EEPROM_REG_11, 0xb7 }, |
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{ LP8860_EEPROM_REG_12, 0x17 }, |
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{ LP8860_EEPROM_REG_13, 0xef }, |
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{ LP8860_EEPROM_REG_14, 0xb0 }, |
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{ LP8860_EEPROM_REG_15, 0x87 }, |
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{ LP8860_EEPROM_REG_16, 0xce }, |
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{ LP8860_EEPROM_REG_17, 0x72 }, |
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{ LP8860_EEPROM_REG_18, 0xe5 }, |
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{ LP8860_EEPROM_REG_19, 0xdf }, |
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{ LP8860_EEPROM_REG_20, 0x35 }, |
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{ LP8860_EEPROM_REG_21, 0x06 }, |
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{ LP8860_EEPROM_REG_22, 0xdc }, |
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{ LP8860_EEPROM_REG_23, 0x88 }, |
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{ LP8860_EEPROM_REG_24, 0x3E }, |
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}; |
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static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock) |
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{ |
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int ret; |
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mutex_lock(&led->lock); |
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if (lock == LP8860_UNLOCK_EEPROM) { |
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ret = regmap_write(led->regmap, |
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LP8860_EEPROM_UNLOCK, |
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LP8860_EEPROM_CODE_1); |
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if (ret) { |
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dev_err(&led->client->dev, "EEPROM Unlock failed\n"); |
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goto out; |
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} |
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ret = regmap_write(led->regmap, |
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LP8860_EEPROM_UNLOCK, |
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LP8860_EEPROM_CODE_2); |
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if (ret) { |
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dev_err(&led->client->dev, "EEPROM Unlock failed\n"); |
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goto out; |
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} |
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ret = regmap_write(led->regmap, |
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LP8860_EEPROM_UNLOCK, |
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LP8860_EEPROM_CODE_3); |
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if (ret) { |
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dev_err(&led->client->dev, "EEPROM Unlock failed\n"); |
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goto out; |
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} |
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} else { |
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ret = regmap_write(led->regmap, |
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LP8860_EEPROM_UNLOCK, |
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LP8860_LOCK_EEPROM); |
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} |
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out: |
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mutex_unlock(&led->lock); |
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return ret; |
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} |
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static int lp8860_fault_check(struct lp8860_led *led) |
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{ |
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int ret, fault; |
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unsigned int read_buf; |
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ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf); |
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if (ret) |
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goto out; |
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fault = read_buf; |
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ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf); |
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if (ret) |
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goto out; |
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fault |= read_buf; |
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/* Attempt to clear any faults */ |
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if (fault) |
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ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR, |
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LP8860_CLEAR_FAULTS); |
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out: |
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return ret; |
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} |
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static int lp8860_brightness_set(struct led_classdev *led_cdev, |
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enum led_brightness brt_val) |
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{ |
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struct lp8860_led *led = |
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container_of(led_cdev, struct lp8860_led, led_dev); |
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int disp_brightness = brt_val * 255; |
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int ret; |
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mutex_lock(&led->lock); |
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ret = lp8860_fault_check(led); |
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if (ret) { |
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dev_err(&led->client->dev, "Cannot read/clear faults\n"); |
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goto out; |
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} |
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ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB, |
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(disp_brightness & 0xff00) >> 8); |
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if (ret) { |
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dev_err(&led->client->dev, "Cannot write CL1 MSB\n"); |
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goto out; |
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} |
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ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB, |
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disp_brightness & 0xff); |
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if (ret) { |
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dev_err(&led->client->dev, "Cannot write CL1 LSB\n"); |
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goto out; |
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} |
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out: |
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mutex_unlock(&led->lock); |
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return ret; |
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} |
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static int lp8860_init(struct lp8860_led *led) |
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{ |
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unsigned int read_buf; |
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int ret, i, reg_count; |
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if (led->regulator) { |
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ret = regulator_enable(led->regulator); |
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if (ret) { |
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dev_err(&led->client->dev, |
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"Failed to enable regulator\n"); |
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return ret; |
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} |
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} |
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if (led->enable_gpio) |
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gpiod_direction_output(led->enable_gpio, 1); |
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ret = lp8860_fault_check(led); |
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if (ret) |
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goto out; |
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ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf); |
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if (ret) |
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goto out; |
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ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM); |
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if (ret) { |
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dev_err(&led->client->dev, "Failed unlocking EEPROM\n"); |
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goto out; |
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} |
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reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]); |
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for (i = 0; i < reg_count; i++) { |
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ret = regmap_write(led->eeprom_regmap, |
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lp8860_eeprom_disp_regs[i].reg, |
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lp8860_eeprom_disp_regs[i].value); |
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if (ret) { |
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dev_err(&led->client->dev, "Failed writing EEPROM\n"); |
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goto out; |
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} |
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} |
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ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM); |
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if (ret) |
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goto out; |
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ret = regmap_write(led->regmap, |
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LP8860_EEPROM_CNTRL, |
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LP8860_PROGRAM_EEPROM); |
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if (ret) { |
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dev_err(&led->client->dev, "Failed programming EEPROM\n"); |
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goto out; |
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} |
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return ret; |
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out: |
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if (ret) |
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if (led->enable_gpio) |
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gpiod_direction_output(led->enable_gpio, 0); |
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if (led->regulator) { |
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ret = regulator_disable(led->regulator); |
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if (ret) |
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dev_err(&led->client->dev, |
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"Failed to disable regulator\n"); |
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} |
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return ret; |
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} |
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static const struct reg_default lp8860_reg_defs[] = { |
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{ LP8860_DISP_CL1_BRT_MSB, 0x00}, |
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{ LP8860_DISP_CL1_BRT_LSB, 0x00}, |
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{ LP8860_DISP_CL1_CURR_MSB, 0x00}, |
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{ LP8860_DISP_CL1_CURR_LSB, 0x00}, |
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{ LP8860_CL2_BRT_MSB, 0x00}, |
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{ LP8860_CL2_BRT_LSB, 0x00}, |
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{ LP8860_CL2_CURRENT, 0x00}, |
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{ LP8860_CL3_BRT_MSB, 0x00}, |
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{ LP8860_CL3_BRT_LSB, 0x00}, |
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{ LP8860_CL3_CURRENT, 0x00}, |
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{ LP8860_CL4_BRT_MSB, 0x00}, |
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{ LP8860_CL4_BRT_LSB, 0x00}, |
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{ LP8860_CL4_CURRENT, 0x00}, |
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{ LP8860_CONFIG, 0x00}, |
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{ LP8860_FAULT_CLEAR, 0x00}, |
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{ LP8860_EEPROM_CNTRL, 0x80}, |
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{ LP8860_EEPROM_UNLOCK, 0x00}, |
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}; |
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static const struct regmap_config lp8860_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = LP8860_EEPROM_UNLOCK, |
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.reg_defaults = lp8860_reg_defs, |
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.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs), |
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.cache_type = REGCACHE_NONE, |
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}; |
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static const struct reg_default lp8860_eeprom_defs[] = { |
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{ LP8860_EEPROM_REG_0, 0x00 }, |
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{ LP8860_EEPROM_REG_1, 0x00 }, |
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{ LP8860_EEPROM_REG_2, 0x00 }, |
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{ LP8860_EEPROM_REG_3, 0x00 }, |
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{ LP8860_EEPROM_REG_4, 0x00 }, |
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{ LP8860_EEPROM_REG_5, 0x00 }, |
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{ LP8860_EEPROM_REG_6, 0x00 }, |
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{ LP8860_EEPROM_REG_7, 0x00 }, |
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{ LP8860_EEPROM_REG_8, 0x00 }, |
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{ LP8860_EEPROM_REG_9, 0x00 }, |
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{ LP8860_EEPROM_REG_10, 0x00 }, |
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{ LP8860_EEPROM_REG_11, 0x00 }, |
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{ LP8860_EEPROM_REG_12, 0x00 }, |
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{ LP8860_EEPROM_REG_13, 0x00 }, |
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{ LP8860_EEPROM_REG_14, 0x00 }, |
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{ LP8860_EEPROM_REG_15, 0x00 }, |
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{ LP8860_EEPROM_REG_16, 0x00 }, |
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{ LP8860_EEPROM_REG_17, 0x00 }, |
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{ LP8860_EEPROM_REG_18, 0x00 }, |
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{ LP8860_EEPROM_REG_19, 0x00 }, |
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{ LP8860_EEPROM_REG_20, 0x00 }, |
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{ LP8860_EEPROM_REG_21, 0x00 }, |
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{ LP8860_EEPROM_REG_22, 0x00 }, |
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{ LP8860_EEPROM_REG_23, 0x00 }, |
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{ LP8860_EEPROM_REG_24, 0x00 }, |
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}; |
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static const struct regmap_config lp8860_eeprom_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = LP8860_EEPROM_REG_24, |
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.reg_defaults = lp8860_eeprom_defs, |
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.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs), |
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.cache_type = REGCACHE_NONE, |
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}; |
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static int lp8860_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 lp8860_led *led; |
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struct device_node *np = dev_of_node(&client->dev); |
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struct device_node *child_node; |
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struct led_init_data init_data = {}; |
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led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); |
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if (!led) |
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return -ENOMEM; |
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child_node = of_get_next_available_child(np, NULL); |
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if (!child_node) |
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return -EINVAL; |
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led->enable_gpio = devm_gpiod_get_optional(&client->dev, |
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"enable", GPIOD_OUT_LOW); |
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if (IS_ERR(led->enable_gpio)) { |
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ret = PTR_ERR(led->enable_gpio); |
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dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret); |
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return ret; |
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} |
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led->regulator = devm_regulator_get(&client->dev, "vled"); |
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if (IS_ERR(led->regulator)) |
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led->regulator = NULL; |
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led->client = client; |
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led->led_dev.brightness_set_blocking = lp8860_brightness_set; |
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mutex_init(&led->lock); |
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i2c_set_clientdata(client, led); |
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led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config); |
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if (IS_ERR(led->regmap)) { |
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ret = PTR_ERR(led->regmap); |
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dev_err(&client->dev, "Failed to allocate register map: %d\n", |
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ret); |
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return ret; |
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} |
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led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config); |
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if (IS_ERR(led->eeprom_regmap)) { |
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ret = PTR_ERR(led->eeprom_regmap); |
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dev_err(&client->dev, "Failed to allocate register map: %d\n", |
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ret); |
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return ret; |
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} |
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ret = lp8860_init(led); |
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if (ret) |
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return ret; |
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init_data.fwnode = of_fwnode_handle(child_node); |
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init_data.devicename = LP8860_NAME; |
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init_data.default_label = ":display_cluster"; |
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ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev, |
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&init_data); |
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if (ret) { |
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dev_err(&client->dev, "led register err: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static int lp8860_remove(struct i2c_client *client) |
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{ |
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struct lp8860_led *led = i2c_get_clientdata(client); |
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int ret; |
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if (led->enable_gpio) |
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gpiod_direction_output(led->enable_gpio, 0); |
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if (led->regulator) { |
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ret = regulator_disable(led->regulator); |
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if (ret) |
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dev_err(&led->client->dev, |
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"Failed to disable regulator\n"); |
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} |
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mutex_destroy(&led->lock); |
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return 0; |
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} |
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static const struct i2c_device_id lp8860_id[] = { |
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{ "lp8860", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, lp8860_id); |
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static const struct of_device_id of_lp8860_leds_match[] = { |
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{ .compatible = "ti,lp8860", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, of_lp8860_leds_match); |
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static struct i2c_driver lp8860_driver = { |
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.driver = { |
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.name = "lp8860", |
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.of_match_table = of_lp8860_leds_match, |
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}, |
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.probe = lp8860_probe, |
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.remove = lp8860_remove, |
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.id_table = lp8860_id, |
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}; |
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module_i2c_driver(lp8860_driver); |
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MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver"); |
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MODULE_AUTHOR("Dan Murphy <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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