530 lines
13 KiB
C
530 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// TI LM3692x LED chip family driver
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// Copyright (C) 2017-18 Texas Instruments Incorporated - https://www.ti.com/
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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/log2.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/mutex.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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#define LM36922_MODEL 0
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#define LM36923_MODEL 1
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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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#define LM36923_LED3_EN BIT(3)
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#define LM3692X_ENABLE_MASK (LM3692X_DEVICE_EN | LM3692X_LED1_EN | \
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LM3692X_LED2_EN | LM36923_LED3_EN)
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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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* @led_enable: LED sync to be enabled
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* @model_id: Current device model ID enumerated
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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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int led_enable;
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int model_id;
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u8 boost_ctrl, brightness_ctrl;
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bool enabled;
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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_leds_enable(struct lm3692x_led *led)
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{
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int enable_state;
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int ret, reg_ret;
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if (led->enabled)
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return 0;
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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: %d\n", ret);
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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: %d\n",
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ret);
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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 LEDx enable bits are 0 and the device enable
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* bit is set to 1.
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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_EN, LM3692X_DEVICE_EN);
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if (ret)
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goto out;
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/* Set the brightness to 0 so when enabled the LEDs do not come
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* on with full brightness.
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*/
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ret = regmap_write(led->regmap, LM3692X_BRT_MSB, 0);
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if (ret)
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goto out;
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ret = regmap_write(led->regmap, LM3692X_BRT_LSB, 0);
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if (ret)
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goto out;
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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, led->boost_ctrl);
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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_RAMP_EN);
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if (ret)
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goto out;
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switch (led->led_enable) {
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case 0:
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default:
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if (led->model_id == LM36923_MODEL)
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enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN |
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LM36923_LED3_EN;
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else
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enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN;
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break;
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case 1:
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enable_state = LM3692X_LED1_EN;
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break;
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case 2:
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enable_state = LM3692X_LED2_EN;
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break;
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case 3:
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if (led->model_id == LM36923_MODEL) {
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enable_state = LM36923_LED3_EN;
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break;
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}
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ret = -EINVAL;
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dev_err(&led->client->dev,
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"LED3 sync not available on this device\n");
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goto out;
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}
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ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK,
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enable_state | LM3692X_DEVICE_EN);
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led->enabled = true;
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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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reg_ret = regulator_disable(led->regulator);
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if (reg_ret)
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dev_err(&led->client->dev,
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"Failed to disable regulator: %d\n", reg_ret);
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}
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return ret;
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}
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static int lm3692x_leds_disable(struct lm3692x_led *led)
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{
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int ret;
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if (!led->enabled)
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return 0;
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ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0);
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if (ret) {
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dev_err(&led->client->dev, "Failed to disable regulator: %d\n",
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ret);
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return ret;
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}
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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: %d\n", ret);
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}
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led->enabled = false;
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return ret;
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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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if (brt_val == 0) {
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ret = lm3692x_leds_disable(led);
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goto out;
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} else {
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lm3692x_leds_enable(led);
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}
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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: %d\n",
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ret);
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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: %d\n", ret);
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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: %d\n", ret);
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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 enum led_brightness lm3692x_max_brightness(struct lm3692x_led *led,
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u32 max_cur)
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{
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u32 max_code;
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/* see p.12 of LM36922 data sheet for brightness formula */
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max_code = ((max_cur * 1000) - 37806) / 12195;
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if (max_code > 0x7FF)
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max_code = 0x7FF;
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return max_code >> 3;
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}
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static int lm3692x_probe_dt(struct lm3692x_led *led)
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{
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struct fwnode_handle *child = NULL;
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struct led_init_data init_data = {};
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u32 ovp, max_cur;
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int ret;
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led->enable_gpio = devm_gpiod_get_optional(&led->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(&led->client->dev, "Failed to get enable gpio: %d\n",
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ret);
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return ret;
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}
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led->regulator = devm_regulator_get_optional(&led->client->dev, "vled");
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if (IS_ERR(led->regulator)) {
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ret = PTR_ERR(led->regulator);
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if (ret != -ENODEV)
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return dev_err_probe(&led->client->dev, ret,
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"Failed to get vled regulator\n");
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led->regulator = NULL;
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}
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led->boost_ctrl = LM3692X_BOOST_SW_1MHZ |
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LM3692X_BOOST_SW_NO_SHIFT |
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LM3692X_OCP_PROT_1_5A;
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ret = device_property_read_u32(&led->client->dev,
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"ti,ovp-microvolt", &ovp);
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if (ret) {
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led->boost_ctrl |= LM3692X_OVP_29V;
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} else {
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switch (ovp) {
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case 17000000:
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break;
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case 21000000:
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led->boost_ctrl |= LM3692X_OVP_21V;
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break;
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case 25000000:
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led->boost_ctrl |= LM3692X_OVP_25V;
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break;
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case 29000000:
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led->boost_ctrl |= LM3692X_OVP_29V;
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break;
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default:
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dev_err(&led->client->dev, "Invalid OVP %d\n", ovp);
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return -EINVAL;
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}
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}
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child = device_get_next_child_node(&led->client->dev, child);
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if (!child) {
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dev_err(&led->client->dev, "No LED Child node\n");
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return -ENODEV;
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}
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ret = fwnode_property_read_u32(child, "reg", &led->led_enable);
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if (ret) {
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fwnode_handle_put(child);
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dev_err(&led->client->dev, "reg DT property missing\n");
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return ret;
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}
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ret = fwnode_property_read_u32(child, "led-max-microamp", &max_cur);
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led->led_dev.max_brightness = ret ? LED_FULL :
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lm3692x_max_brightness(led, max_cur);
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init_data.fwnode = child;
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init_data.devicename = led->client->name;
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init_data.default_label = ":";
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ret = devm_led_classdev_register_ext(&led->client->dev, &led->led_dev,
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&init_data);
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if (ret)
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dev_err(&led->client->dev, "led register err: %d\n", ret);
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fwnode_handle_put(init_data.fwnode);
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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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struct lm3692x_led *led;
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int ret;
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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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mutex_init(&led->lock);
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led->client = client;
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led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
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led->model_id = id->driver_data;
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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)) {
|
|
ret = PTR_ERR(led->regmap);
|
|
dev_err(&client->dev, "Failed to allocate register map: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = lm3692x_probe_dt(led);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = lm3692x_leds_enable(led);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lm3692x_remove(struct i2c_client *client)
|
|
{
|
|
struct lm3692x_led *led = i2c_get_clientdata(client);
|
|
|
|
lm3692x_leds_disable(led);
|
|
mutex_destroy(&led->lock);
|
|
}
|
|
|
|
static const struct i2c_device_id lm3692x_id[] = {
|
|
{ "lm36922", LM36922_MODEL },
|
|
{ "lm36923", LM36923_MODEL },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm3692x_id);
|
|
|
|
static const struct of_device_id of_lm3692x_leds_match[] = {
|
|
{ .compatible = "ti,lm36922", },
|
|
{ .compatible = "ti,lm36923", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_lm3692x_leds_match);
|
|
|
|
static struct i2c_driver lm3692x_driver = {
|
|
.driver = {
|
|
.name = "lm3692x",
|
|
.of_match_table = of_lm3692x_leds_match,
|
|
},
|
|
.probe = lm3692x_probe,
|
|
.remove = lm3692x_remove,
|
|
.id_table = lm3692x_id,
|
|
};
|
|
module_i2c_driver(lm3692x_driver);
|
|
|
|
MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver");
|
|
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
|
|
MODULE_LICENSE("GPL v2");
|