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leds: lm3692x: Introduce LM3692x dual string driver
Introducing the LM3692x Dual-String white LED driver. Data sheet is located http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf Signed-off-by: Dan Murphy <dmurphy@ti.com> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Dan Murphy
Jacek Anaszewski
parent
1d9aa24b65
commit
9699cb6bbe
@ -137,6 +137,13 @@ config LEDS_LM3642
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converter plus 1.5A constant current driver for a high-current
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white LED.
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config LEDS_LM3692X
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tristate "LED support for LM3692x Chips"
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depends on LEDS_CLASS && I2C && OF
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select REGMAP_I2C
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help
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This option enables support for the TI LM3692x family
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of white LED string drivers used for backlighting.
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config LEDS_LOCOMO
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tristate "LED Support for Locomo device"
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@ -74,6 +74,7 @@ obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o
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obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o
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obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
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obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
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obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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393
drivers/leds/leds-lm3692x.c
Normal file
393
drivers/leds/leds-lm3692x.c
Normal file
@ -0,0 +1,393 @@
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/*
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* TI lm3692x LED Driver
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*
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* Copyright (C) 2017 Texas Instruments
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*
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* Author: Dan Murphy <dmurphy@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* Data sheet is located
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* http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <uapi/linux/uleds.h>
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#define LM3692X_REV 0x0
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#define LM3692X_RESET 0x1
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#define LM3692X_EN 0x10
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#define LM3692X_BRT_CTRL 0x11
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#define LM3692X_PWM_CTRL 0x12
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#define LM3692X_BOOST_CTRL 0x13
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#define LM3692X_AUTO_FREQ_HI 0x15
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#define LM3692X_AUTO_FREQ_LO 0x16
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#define LM3692X_BL_ADJ_THRESH 0x17
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#define LM3692X_BRT_LSB 0x18
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#define LM3692X_BRT_MSB 0x19
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#define LM3692X_FAULT_CTRL 0x1e
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#define LM3692X_FAULT_FLAGS 0x1f
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#define LM3692X_SW_RESET BIT(0)
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#define LM3692X_DEVICE_EN BIT(0)
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#define LM3692X_LED1_EN BIT(1)
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#define LM3692X_LED2_EN BIT(2)
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/* Brightness Control Bits */
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#define LM3692X_BL_ADJ_POL BIT(0)
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#define LM3692X_RAMP_RATE_125us 0x00
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#define LM3692X_RAMP_RATE_250us BIT(1)
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#define LM3692X_RAMP_RATE_500us BIT(2)
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#define LM3692X_RAMP_RATE_1ms (BIT(1) | BIT(2))
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#define LM3692X_RAMP_RATE_2ms BIT(3)
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#define LM3692X_RAMP_RATE_4ms (BIT(3) | BIT(1))
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#define LM3692X_RAMP_RATE_8ms (BIT(2) | BIT(3))
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#define LM3692X_RAMP_RATE_16ms (BIT(1) | BIT(2) | BIT(3))
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#define LM3692X_RAMP_EN BIT(4)
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#define LM3692X_BRHT_MODE_REG 0x00
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#define LM3692X_BRHT_MODE_PWM BIT(5)
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#define LM3692X_BRHT_MODE_MULTI_RAMP BIT(6)
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#define LM3692X_BRHT_MODE_RAMP_MULTI (BIT(5) | BIT(6))
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#define LM3692X_MAP_MODE_EXP BIT(7)
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/* PWM Register Bits */
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#define LM3692X_PWM_FILTER_100 BIT(0)
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#define LM3692X_PWM_FILTER_150 BIT(1)
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#define LM3692X_PWM_FILTER_200 (BIT(0) | BIT(1))
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#define LM3692X_PWM_HYSTER_1LSB BIT(2)
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#define LM3692X_PWM_HYSTER_2LSB BIT(3)
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#define LM3692X_PWM_HYSTER_3LSB (BIT(3) | BIT(2))
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#define LM3692X_PWM_HYSTER_4LSB BIT(4)
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#define LM3692X_PWM_HYSTER_5LSB (BIT(4) | BIT(2))
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#define LM3692X_PWM_HYSTER_6LSB (BIT(4) | BIT(3))
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#define LM3692X_PWM_POLARITY BIT(5)
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#define LM3692X_PWM_SAMP_4MHZ BIT(6)
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#define LM3692X_PWM_SAMP_24MHZ BIT(7)
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/* Boost Control Bits */
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#define LM3692X_OCP_PROT_1A BIT(0)
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#define LM3692X_OCP_PROT_1_25A BIT(1)
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#define LM3692X_OCP_PROT_1_5A (BIT(0) | BIT(1))
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#define LM3692X_OVP_21V BIT(2)
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#define LM3692X_OVP_25V BIT(3)
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#define LM3692X_OVP_29V (BIT(2) | BIT(3))
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#define LM3692X_MIN_IND_22UH BIT(4)
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#define LM3692X_BOOST_SW_1MHZ BIT(5)
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#define LM3692X_BOOST_SW_NO_SHIFT BIT(6)
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/* Fault Control Bits */
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#define LM3692X_FAULT_CTRL_OVP BIT(0)
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#define LM3692X_FAULT_CTRL_OCP BIT(1)
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#define LM3692X_FAULT_CTRL_TSD BIT(2)
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#define LM3692X_FAULT_CTRL_OPEN BIT(3)
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/* Fault Flag Bits */
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#define LM3692X_FAULT_FLAG_OVP BIT(0)
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#define LM3692X_FAULT_FLAG_OCP BIT(1)
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#define LM3692X_FAULT_FLAG_TSD BIT(2)
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#define LM3692X_FAULT_FLAG_SHRT BIT(3)
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#define LM3692X_FAULT_FLAG_OPEN BIT(4)
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/**
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* struct lm3692x_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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* @enable_gpio - VDDIO/EN gpio to enable communication interface
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* @regulator - LED supply regulator pointer
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* @label - LED label
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*/
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struct lm3692x_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 gpio_desc *enable_gpio;
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struct regulator *regulator;
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char label[LED_MAX_NAME_SIZE];
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};
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static const struct reg_default lm3692x_reg_defs[] = {
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{LM3692X_EN, 0xf},
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{LM3692X_BRT_CTRL, 0x61},
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{LM3692X_PWM_CTRL, 0x73},
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{LM3692X_BOOST_CTRL, 0x6f},
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{LM3692X_AUTO_FREQ_HI, 0x0},
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{LM3692X_AUTO_FREQ_LO, 0x0},
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{LM3692X_BL_ADJ_THRESH, 0x0},
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{LM3692X_BRT_LSB, 0x7},
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{LM3692X_BRT_MSB, 0xff},
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{LM3692X_FAULT_CTRL, 0x7},
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};
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static const struct regmap_config lm3692x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = LM3692X_FAULT_FLAGS,
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.reg_defaults = lm3692x_reg_defs,
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.num_reg_defaults = ARRAY_SIZE(lm3692x_reg_defs),
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.cache_type = REGCACHE_RBTREE,
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};
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static int lm3692x_fault_check(struct lm3692x_led *led)
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{
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int ret;
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unsigned int read_buf;
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ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);
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if (ret)
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return ret;
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if (read_buf)
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dev_err(&led->client->dev, "Detected a fault 0x%X\n", read_buf);
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/* The first read may clear the fault. Check again to see if the fault
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* still exits and return that value.
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*/
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regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf);
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if (read_buf)
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dev_err(&led->client->dev, "Second read of fault flags 0x%X\n",
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read_buf);
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return read_buf;
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}
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static int lm3692x_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 lm3692x_led *led =
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container_of(led_cdev, struct lm3692x_led, led_dev);
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int ret;
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int led_brightness_lsb = (brt_val >> 5);
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mutex_lock(&led->lock);
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ret = lm3692x_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, LM3692X_BRT_MSB, brt_val);
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if (ret) {
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dev_err(&led->client->dev, "Cannot write MSB\n");
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goto out;
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}
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ret = regmap_write(led->regmap, LM3692X_BRT_LSB, led_brightness_lsb);
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if (ret) {
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dev_err(&led->client->dev, "Cannot write 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 lm3692x_init(struct lm3692x_led *led)
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{
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int ret;
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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 = lm3692x_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, LM3692X_BRT_CTRL, 0x00);
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if (ret)
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goto out;
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/*
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* For glitch free operation, the following data should
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* only be written while device enable bit is 0
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* per Section 7.5.14 of the data sheet
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*/
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ret = regmap_write(led->regmap, LM3692X_PWM_CTRL,
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LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL,
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LM3692X_BRHT_MODE_RAMP_MULTI |
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LM3692X_BL_ADJ_POL |
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LM3692X_RAMP_RATE_250us);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_LO, 0x00);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_BL_ADJ_THRESH, 0x00);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_BRT_CTRL,
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LM3692X_BL_ADJ_POL | LM3692X_PWM_HYSTER_4LSB);
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if (ret)
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goto out;
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return ret;
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out:
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dev_err(&led->client->dev, "Fail writing initialization values\n");
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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 int lm3692x_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 lm3692x_led *led;
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struct device_node *np = client->dev.of_node;
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struct device_node *child_node;
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const char *name;
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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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for_each_available_child_of_node(np, child_node) {
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led->led_dev.default_trigger = of_get_property(child_node,
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"linux,default-trigger",
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NULL);
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ret = of_property_read_string(child_node, "label", &name);
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if (!ret)
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snprintf(led->label, sizeof(led->label),
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"%s:%s", id->name, name);
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else
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snprintf(led->label, sizeof(led->label),
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"%s::backlight_cluster", id->name);
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};
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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.name = led->label;
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led->led_dev.brightness_set_blocking = lm3692x_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, &lm3692x_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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ret = lm3692x_init(led);
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if (ret)
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return ret;
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ret = devm_led_classdev_register(&client->dev, &led->led_dev);
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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 lm3692x_remove(struct i2c_client *client)
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{
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struct lm3692x_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 lm3692x_id[] = {
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{ "lm36922", 0 },
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{ "lm36923", 1 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm3692x_id);
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static const struct of_device_id of_lm3692x_leds_match[] = {
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{ .compatible = "ti,lm36922", },
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{ .compatible = "ti,lm36923", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_lm3692x_leds_match);
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static struct i2c_driver lm3692x_driver = {
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.driver = {
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.name = "lm3692x",
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.of_match_table = of_lm3692x_leds_match,
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},
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.probe = lm3692x_probe,
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.remove = lm3692x_remove,
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.id_table = lm3692x_id,
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};
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module_i2c_driver(lm3692x_driver);
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MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver");
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MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
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MODULE_LICENSE("GPL v2");
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