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386 lines
9.4 KiB
386 lines
9.4 KiB
// 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 - 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/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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int num_banks; |
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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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struct device *dev = led->priv->dev; |
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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(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(dev, "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(dev, "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 device *dev = priv->dev; |
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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(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(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(dev, "Cannot write OUTPUT config\n"); |
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for (i = 0; i < priv->num_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(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 device *dev = priv->dev; |
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struct lm3697_led *led; |
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int ret = -EINVAL; |
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int control_bank; |
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size_t i = 0; |
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int j; |
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priv->enable_gpio = devm_gpiod_get_optional(dev, "enable", |
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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(dev, "Failed to get enable gpio: %d\n", ret); |
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return ret; |
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} |
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priv->regulator = devm_regulator_get(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(dev, child) { |
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struct led_init_data init_data = {}; |
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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(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(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(dev, child, &led->lmu_data); |
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if (ret) |
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dev_warn(dev, |
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"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(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(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(dev, child, &led->lmu_data); |
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if (ret) |
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dev_warn(dev, "runtime-ramp properties missing\n"); |
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init_data.fwnode = child; |
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init_data.devicename = priv->client->name; |
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/* for backwards compatibility if `label` is not present */ |
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init_data.default_label = ":"; |
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led->priv = priv; |
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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_ext(dev, &led->led_dev, |
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&init_data); |
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if (ret) { |
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dev_err(dev, "led register err: %d\n", 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 device *dev = &client->dev; |
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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(dev); |
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if (!count || count > LM3697_MAX_CONTROL_BANKS) { |
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dev_err(dev, "Strange device tree!"); |
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return -ENODEV; |
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} |
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led = devm_kzalloc(dev, struct_size(led, leds, count), 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 = dev; |
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led->num_banks = count; |
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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(dev, "Failed to allocate register map: %d\n", 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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struct device *dev = &led->client->dev; |
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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(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(dev, "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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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