393 lines
9.7 KiB
C
393 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// TI LM3697 LED chip family driver
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// Copyright (C) 2018 Texas Instruments Incorporated - http://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/of.h>
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#include <linux/of_gpio.h>
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#include <linux/regulator/consumer.h>
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#include <linux/leds-ti-lmu-common.h>
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#define LM3697_REV 0x0
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#define LM3697_RESET 0x1
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#define LM3697_OUTPUT_CONFIG 0x10
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#define LM3697_CTRL_A_RAMP 0x11
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#define LM3697_CTRL_B_RAMP 0x12
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#define LM3697_CTRL_A_B_RT_RAMP 0x13
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#define LM3697_CTRL_A_B_RAMP_CFG 0x14
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#define LM3697_CTRL_A_B_BRT_CFG 0x16
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#define LM3697_CTRL_A_FS_CURR_CFG 0x17
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#define LM3697_CTRL_B_FS_CURR_CFG 0x18
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#define LM3697_PWM_CFG 0x1c
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#define LM3697_CTRL_A_BRT_LSB 0x20
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#define LM3697_CTRL_A_BRT_MSB 0x21
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#define LM3697_CTRL_B_BRT_LSB 0x22
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#define LM3697_CTRL_B_BRT_MSB 0x23
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#define LM3697_CTRL_ENABLE 0x24
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#define LM3697_SW_RESET BIT(0)
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#define LM3697_CTRL_A_EN BIT(0)
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#define LM3697_CTRL_B_EN BIT(1)
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#define LM3697_CTRL_A_B_EN (LM3697_CTRL_A_EN | LM3697_CTRL_B_EN)
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#define LM3697_MAX_LED_STRINGS 3
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#define LM3697_CONTROL_A 0
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#define LM3697_CONTROL_B 1
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#define LM3697_MAX_CONTROL_BANKS 2
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/**
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* struct lm3697_led -
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* @hvled_strings: Array of LED strings associated with a control bank
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* @label: LED label
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* @led_dev: LED class device
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* @priv: Pointer to the device struct
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* @lmu_data: Register and setting values for common code
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* @control_bank: Control bank the LED is associated to. 0 is control bank A
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* 1 is control bank B
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*/
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struct lm3697_led {
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u32 hvled_strings[LM3697_MAX_LED_STRINGS];
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char label[LED_MAX_NAME_SIZE];
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struct led_classdev led_dev;
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struct lm3697 *priv;
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struct ti_lmu_bank lmu_data;
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int control_bank;
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int enabled;
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int num_leds;
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};
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/**
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* struct lm3697 -
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* @enable_gpio: Hardware enable gpio
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* @regulator: LED supply regulator pointer
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* @client: Pointer to the I2C client
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* @regmap: Devices register map
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* @dev: Pointer to the devices device struct
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* @lock: Lock for reading/writing the device
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* @leds: Array of LED strings
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*/
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struct lm3697 {
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struct gpio_desc *enable_gpio;
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struct regulator *regulator;
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struct i2c_client *client;
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struct regmap *regmap;
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struct device *dev;
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struct mutex lock;
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int bank_cfg;
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struct lm3697_led leds[];
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};
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static const struct reg_default lm3697_reg_defs[] = {
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{LM3697_OUTPUT_CONFIG, 0x6},
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{LM3697_CTRL_A_RAMP, 0x0},
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{LM3697_CTRL_B_RAMP, 0x0},
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{LM3697_CTRL_A_B_RT_RAMP, 0x0},
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{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
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{LM3697_CTRL_A_B_BRT_CFG, 0x0},
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{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
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{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
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{LM3697_PWM_CFG, 0xc},
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{LM3697_CTRL_A_BRT_LSB, 0x0},
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{LM3697_CTRL_A_BRT_MSB, 0x0},
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{LM3697_CTRL_B_BRT_LSB, 0x0},
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{LM3697_CTRL_B_BRT_MSB, 0x0},
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{LM3697_CTRL_ENABLE, 0x0},
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};
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static const struct regmap_config lm3697_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = LM3697_CTRL_ENABLE,
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.reg_defaults = lm3697_reg_defs,
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.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
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.cache_type = REGCACHE_FLAT,
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};
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static int lm3697_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 lm3697_led *led = container_of(led_cdev, struct lm3697_led,
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led_dev);
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int ctrl_en_val = (1 << led->control_bank);
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int ret;
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mutex_lock(&led->priv->lock);
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if (brt_val == LED_OFF) {
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ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
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ctrl_en_val, ~ctrl_en_val);
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if (ret) {
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dev_err(&led->priv->client->dev, "Cannot write ctrl register\n");
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goto brightness_out;
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}
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led->enabled = LED_OFF;
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} else {
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ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
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if (ret) {
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dev_err(&led->priv->client->dev,
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"Cannot write brightness\n");
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goto brightness_out;
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}
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if (!led->enabled) {
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ret = regmap_update_bits(led->priv->regmap,
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LM3697_CTRL_ENABLE,
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ctrl_en_val, ctrl_en_val);
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if (ret) {
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dev_err(&led->priv->client->dev,
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"Cannot enable the device\n");
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goto brightness_out;
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}
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led->enabled = brt_val;
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}
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}
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brightness_out:
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mutex_unlock(&led->priv->lock);
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return ret;
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}
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static int lm3697_init(struct lm3697 *priv)
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{
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struct lm3697_led *led;
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int i, ret;
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if (priv->enable_gpio) {
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gpiod_direction_output(priv->enable_gpio, 1);
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} else {
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ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
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if (ret) {
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dev_err(&priv->client->dev, "Cannot reset the device\n");
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goto out;
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}
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}
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ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
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if (ret) {
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dev_err(&priv->client->dev, "Cannot write ctrl enable\n");
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goto out;
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}
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ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
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if (ret)
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dev_err(&priv->client->dev, "Cannot write OUTPUT config\n");
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for (i = 0; i < LM3697_MAX_CONTROL_BANKS; i++) {
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led = &priv->leds[i];
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ret = ti_lmu_common_set_ramp(&led->lmu_data);
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if (ret)
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dev_err(&priv->client->dev, "Setting the ramp rate failed\n");
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}
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out:
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return ret;
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}
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static int lm3697_probe_dt(struct lm3697 *priv)
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{
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struct fwnode_handle *child = NULL;
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struct lm3697_led *led;
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const char *name;
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int control_bank;
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size_t i = 0;
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int ret = -EINVAL;
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int j;
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priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
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"enable", GPIOD_OUT_LOW);
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if (IS_ERR(priv->enable_gpio)) {
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ret = PTR_ERR(priv->enable_gpio);
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dev_err(&priv->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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priv->regulator = devm_regulator_get(&priv->client->dev, "vled");
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if (IS_ERR(priv->regulator))
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priv->regulator = NULL;
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device_for_each_child_node(priv->dev, child) {
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ret = fwnode_property_read_u32(child, "reg", &control_bank);
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if (ret) {
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dev_err(&priv->client->dev, "reg property missing\n");
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fwnode_handle_put(child);
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goto child_out;
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}
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if (control_bank > LM3697_CONTROL_B) {
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dev_err(&priv->client->dev, "reg property is invalid\n");
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ret = -EINVAL;
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fwnode_handle_put(child);
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goto child_out;
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}
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led = &priv->leds[i];
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ret = ti_lmu_common_get_brt_res(&priv->client->dev,
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child, &led->lmu_data);
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if (ret)
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dev_warn(&priv->client->dev, "brightness resolution property missing\n");
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led->control_bank = control_bank;
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led->lmu_data.regmap = priv->regmap;
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led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
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control_bank;
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led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
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led->control_bank * 2;
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led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
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led->control_bank * 2;
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led->num_leds = fwnode_property_count_u32(child, "led-sources");
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if (led->num_leds > LM3697_MAX_LED_STRINGS) {
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dev_err(&priv->client->dev, "Too many LED strings defined\n");
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continue;
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}
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ret = fwnode_property_read_u32_array(child, "led-sources",
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led->hvled_strings,
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led->num_leds);
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if (ret) {
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dev_err(&priv->client->dev, "led-sources property missing\n");
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fwnode_handle_put(child);
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goto child_out;
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}
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for (j = 0; j < led->num_leds; j++)
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priv->bank_cfg |=
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(led->control_bank << led->hvled_strings[j]);
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ret = ti_lmu_common_get_ramp_params(&priv->client->dev,
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child, &led->lmu_data);
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if (ret)
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dev_warn(&priv->client->dev, "runtime-ramp properties missing\n");
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fwnode_property_read_string(child, "linux,default-trigger",
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&led->led_dev.default_trigger);
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ret = fwnode_property_read_string(child, "label", &name);
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if (ret)
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snprintf(led->label, sizeof(led->label),
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"%s::", priv->client->name);
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else
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snprintf(led->label, sizeof(led->label),
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"%s:%s", priv->client->name, name);
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led->priv = priv;
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led->led_dev.name = led->label;
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led->led_dev.max_brightness = led->lmu_data.max_brightness;
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led->led_dev.brightness_set_blocking = lm3697_brightness_set;
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ret = devm_led_classdev_register(priv->dev, &led->led_dev);
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if (ret) {
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dev_err(&priv->client->dev, "led register err: %d\n",
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ret);
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fwnode_handle_put(child);
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goto child_out;
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}
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i++;
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}
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child_out:
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return ret;
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}
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static int lm3697_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct lm3697 *led;
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int count;
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int ret;
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count = device_get_child_node_count(&client->dev);
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if (!count) {
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dev_err(&client->dev, "LEDs are not defined in device tree!");
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return -ENODEV;
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}
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led = devm_kzalloc(&client->dev, struct_size(led, leds, count),
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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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i2c_set_clientdata(client, led);
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led->client = client;
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led->dev = &client->dev;
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led->regmap = devm_regmap_init_i2c(client, &lm3697_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 = lm3697_probe_dt(led);
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if (ret)
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return ret;
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return lm3697_init(led);
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}
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static int lm3697_remove(struct i2c_client *client)
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{
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struct lm3697 *led = i2c_get_clientdata(client);
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int ret;
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ret = regmap_update_bits(led->regmap, LM3697_CTRL_ENABLE,
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LM3697_CTRL_A_B_EN, 0);
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if (ret) {
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dev_err(&led->client->dev, "Failed to disable the device\n");
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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\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 lm3697_id[] = {
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{ "lm3697", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm3697_id);
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static const struct of_device_id of_lm3697_leds_match[] = {
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{ .compatible = "ti,lm3697", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_lm3697_leds_match);
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static struct i2c_driver lm3697_driver = {
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.driver = {
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.name = "lm3697",
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.of_match_table = of_lm3697_leds_match,
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},
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.probe = lm3697_probe,
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.remove = lm3697_remove,
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.id_table = lm3697_id,
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};
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module_i2c_driver(lm3697_driver);
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MODULE_DESCRIPTION("Texas Instruments LM3697 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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