430 lines
11 KiB
C
430 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/bitops.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/led-class-flash.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <media/v4l2-flash-led-class.h>
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#define RT4505_REG_RESET 0x0
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#define RT4505_REG_CONFIG 0x8
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#define RT4505_REG_ILED 0x9
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#define RT4505_REG_ENABLE 0xA
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#define RT4505_REG_FLAGS 0xB
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#define RT4505_RESET_MASK BIT(7)
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#define RT4505_FLASHTO_MASK GENMASK(2, 0)
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#define RT4505_ITORCH_MASK GENMASK(7, 5)
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#define RT4505_ITORCH_SHIFT 5
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#define RT4505_IFLASH_MASK GENMASK(4, 0)
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#define RT4505_ENABLE_MASK GENMASK(5, 0)
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#define RT4505_TORCH_SET (BIT(0) | BIT(4))
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#define RT4505_FLASH_SET (BIT(0) | BIT(1) | BIT(2) | BIT(4))
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#define RT4505_EXT_FLASH_SET (BIT(0) | BIT(1) | BIT(4) | BIT(5))
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#define RT4505_FLASH_GET (BIT(0) | BIT(1) | BIT(4))
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#define RT4505_OVP_MASK BIT(3)
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#define RT4505_SHORT_MASK BIT(2)
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#define RT4505_OTP_MASK BIT(1)
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#define RT4505_TIMEOUT_MASK BIT(0)
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#define RT4505_ITORCH_MINUA 46000
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#define RT4505_ITORCH_MAXUA 375000
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#define RT4505_ITORCH_STPUA 47000
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#define RT4505_IFLASH_MINUA 93750
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#define RT4505_IFLASH_MAXUA 1500000
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#define RT4505_IFLASH_STPUA 93750
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#define RT4505_FLASHTO_MINUS 100000
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#define RT4505_FLASHTO_MAXUS 800000
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#define RT4505_FLASHTO_STPUS 100000
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struct rt4505_priv {
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struct device *dev;
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struct regmap *regmap;
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struct mutex lock;
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struct led_classdev_flash flash;
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struct v4l2_flash *v4l2_flash;
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};
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static int rt4505_torch_brightness_set(struct led_classdev *lcdev,
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enum led_brightness level)
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{
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struct rt4505_priv *priv =
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container_of(lcdev, struct rt4505_priv, flash.led_cdev);
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u32 val = 0;
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int ret;
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mutex_lock(&priv->lock);
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if (level != LED_OFF) {
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ret = regmap_update_bits(priv->regmap,
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RT4505_REG_ILED, RT4505_ITORCH_MASK,
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(level - 1) << RT4505_ITORCH_SHIFT);
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if (ret)
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goto unlock;
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val = RT4505_TORCH_SET;
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}
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ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
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RT4505_ENABLE_MASK, val);
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unlock:
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mutex_unlock(&priv->lock);
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return ret;
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}
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static enum led_brightness rt4505_torch_brightness_get(
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struct led_classdev *lcdev)
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{
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struct rt4505_priv *priv =
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container_of(lcdev, struct rt4505_priv, flash.led_cdev);
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u32 val;
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int ret;
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mutex_lock(&priv->lock);
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ret = regmap_read(priv->regmap, RT4505_REG_ENABLE, &val);
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if (ret) {
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dev_err(lcdev->dev, "Failed to get LED enable\n");
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ret = LED_OFF;
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goto unlock;
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}
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if ((val & RT4505_ENABLE_MASK) != RT4505_TORCH_SET) {
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ret = LED_OFF;
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goto unlock;
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}
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ret = regmap_read(priv->regmap, RT4505_REG_ILED, &val);
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if (ret) {
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dev_err(lcdev->dev, "Failed to get LED brightness\n");
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ret = LED_OFF;
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goto unlock;
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}
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ret = ((val & RT4505_ITORCH_MASK) >> RT4505_ITORCH_SHIFT) + 1;
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unlock:
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mutex_unlock(&priv->lock);
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return ret;
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}
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static int rt4505_flash_brightness_set(struct led_classdev_flash *fled_cdev,
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u32 brightness)
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{
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struct rt4505_priv *priv =
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container_of(fled_cdev, struct rt4505_priv, flash);
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struct led_flash_setting *s = &fled_cdev->brightness;
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u32 val = (brightness - s->min) / s->step;
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int ret;
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mutex_lock(&priv->lock);
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ret = regmap_update_bits(priv->regmap, RT4505_REG_ILED,
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RT4505_IFLASH_MASK, val);
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mutex_unlock(&priv->lock);
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return ret;
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}
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static int rt4505_flash_strobe_set(struct led_classdev_flash *fled_cdev,
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bool state)
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{
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struct rt4505_priv *priv =
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container_of(fled_cdev, struct rt4505_priv, flash);
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u32 val = state ? RT4505_FLASH_SET : 0;
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int ret;
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mutex_lock(&priv->lock);
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ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
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RT4505_ENABLE_MASK, val);
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mutex_unlock(&priv->lock);
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return ret;
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}
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static int rt4505_flash_strobe_get(struct led_classdev_flash *fled_cdev,
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bool *state)
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{
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struct rt4505_priv *priv =
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container_of(fled_cdev, struct rt4505_priv, flash);
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u32 val;
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int ret;
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mutex_lock(&priv->lock);
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ret = regmap_read(priv->regmap, RT4505_REG_ENABLE, &val);
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if (ret)
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goto unlock;
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*state = (val & RT4505_FLASH_GET) == RT4505_FLASH_GET;
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unlock:
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mutex_unlock(&priv->lock);
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return ret;
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}
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static int rt4505_flash_timeout_set(struct led_classdev_flash *fled_cdev,
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u32 timeout)
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{
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struct rt4505_priv *priv =
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container_of(fled_cdev, struct rt4505_priv, flash);
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struct led_flash_setting *s = &fled_cdev->timeout;
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u32 val = (timeout - s->min) / s->step;
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int ret;
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mutex_lock(&priv->lock);
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ret = regmap_update_bits(priv->regmap, RT4505_REG_CONFIG,
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RT4505_FLASHTO_MASK, val);
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mutex_unlock(&priv->lock);
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return ret;
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}
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static int rt4505_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
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{
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struct rt4505_priv *priv =
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container_of(fled_cdev, struct rt4505_priv, flash);
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u32 val, led_faults = 0;
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int ret;
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ret = regmap_read(priv->regmap, RT4505_REG_FLAGS, &val);
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if (ret)
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return ret;
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if (val & RT4505_OVP_MASK)
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led_faults |= LED_FAULT_OVER_VOLTAGE;
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if (val & RT4505_SHORT_MASK)
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led_faults |= LED_FAULT_SHORT_CIRCUIT;
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if (val & RT4505_OTP_MASK)
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led_faults |= LED_FAULT_OVER_TEMPERATURE;
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if (val & RT4505_TIMEOUT_MASK)
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led_faults |= LED_FAULT_TIMEOUT;
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*fault = led_faults;
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return 0;
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}
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static const struct led_flash_ops rt4505_flash_ops = {
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.flash_brightness_set = rt4505_flash_brightness_set,
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.strobe_set = rt4505_flash_strobe_set,
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.strobe_get = rt4505_flash_strobe_get,
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.timeout_set = rt4505_flash_timeout_set,
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.fault_get = rt4505_fault_get,
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};
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static bool rt4505_is_accessible_reg(struct device *dev, unsigned int reg)
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{
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if (reg == RT4505_REG_RESET ||
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(reg >= RT4505_REG_CONFIG && reg <= RT4505_REG_FLAGS))
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return true;
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return false;
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}
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static const struct regmap_config rt4505_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = RT4505_REG_FLAGS,
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.readable_reg = rt4505_is_accessible_reg,
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.writeable_reg = rt4505_is_accessible_reg,
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};
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#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
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static int rt4505_flash_external_strobe_set(struct v4l2_flash *v4l2_flash,
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bool enable)
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{
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struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
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struct rt4505_priv *priv =
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container_of(flash, struct rt4505_priv, flash);
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u32 val = enable ? RT4505_EXT_FLASH_SET : 0;
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int ret;
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mutex_lock(&priv->lock);
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ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
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RT4505_ENABLE_MASK, val);
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mutex_unlock(&priv->lock);
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return ret;
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}
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static const struct v4l2_flash_ops v4l2_flash_ops = {
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.external_strobe_set = rt4505_flash_external_strobe_set,
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};
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static void rt4505_init_v4l2_config(struct rt4505_priv *priv,
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struct v4l2_flash_config *config)
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{
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struct led_classdev_flash *flash = &priv->flash;
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struct led_classdev *lcdev = &flash->led_cdev;
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struct led_flash_setting *s;
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strscpy(config->dev_name, lcdev->dev->kobj.name,
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sizeof(config->dev_name));
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s = &config->intensity;
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s->min = RT4505_ITORCH_MINUA;
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s->step = RT4505_ITORCH_STPUA;
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s->max = s->val = s->min + (lcdev->max_brightness - 1) * s->step;
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config->flash_faults = LED_FAULT_OVER_VOLTAGE |
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LED_FAULT_SHORT_CIRCUIT |
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LED_FAULT_LED_OVER_TEMPERATURE |
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LED_FAULT_TIMEOUT;
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config->has_external_strobe = 1;
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}
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#else
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static const struct v4l2_flash_ops v4l2_flash_ops;
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static void rt4505_init_v4l2_config(struct rt4505_priv *priv,
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struct v4l2_flash_config *config)
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{
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}
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#endif
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static void rt4505_init_flash_properties(struct rt4505_priv *priv,
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struct fwnode_handle *child)
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{
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struct led_classdev_flash *flash = &priv->flash;
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struct led_classdev *lcdev = &flash->led_cdev;
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struct led_flash_setting *s;
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u32 val;
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int ret;
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ret = fwnode_property_read_u32(child, "led-max-microamp", &val);
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if (ret) {
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dev_warn(priv->dev, "led-max-microamp DT property missing\n");
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val = RT4505_ITORCH_MINUA;
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} else
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val = clamp_val(val, RT4505_ITORCH_MINUA, RT4505_ITORCH_MAXUA);
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lcdev->max_brightness =
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(val - RT4505_ITORCH_MINUA) / RT4505_ITORCH_STPUA + 1;
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lcdev->brightness_set_blocking = rt4505_torch_brightness_set;
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lcdev->brightness_get = rt4505_torch_brightness_get;
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lcdev->flags |= LED_DEV_CAP_FLASH;
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ret = fwnode_property_read_u32(child, "flash-max-microamp", &val);
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if (ret) {
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dev_warn(priv->dev, "flash-max-microamp DT property missing\n");
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val = RT4505_IFLASH_MINUA;
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} else
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val = clamp_val(val, RT4505_IFLASH_MINUA, RT4505_IFLASH_MAXUA);
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s = &flash->brightness;
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s->min = RT4505_IFLASH_MINUA;
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s->step = RT4505_IFLASH_STPUA;
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s->max = s->val = val;
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ret = fwnode_property_read_u32(child, "flash-max-timeout-us", &val);
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if (ret) {
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dev_warn(priv->dev,
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"flash-max-timeout-us DT property missing\n");
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val = RT4505_FLASHTO_MINUS;
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} else
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val = clamp_val(val, RT4505_FLASHTO_MINUS,
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RT4505_FLASHTO_MAXUS);
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s = &flash->timeout;
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s->min = RT4505_FLASHTO_MINUS;
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s->step = RT4505_FLASHTO_STPUS;
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s->max = s->val = val;
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flash->ops = &rt4505_flash_ops;
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}
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static int rt4505_probe(struct i2c_client *client)
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{
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struct rt4505_priv *priv;
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struct fwnode_handle *child;
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struct led_init_data init_data = {};
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struct v4l2_flash_config v4l2_config = {};
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int ret;
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priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = &client->dev;
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mutex_init(&priv->lock);
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|
priv->regmap = devm_regmap_init_i2c(client, &rt4505_regmap_config);
|
||
|
|
if (IS_ERR(priv->regmap)) {
|
||
|
|
dev_err(priv->dev, "Failed to allocate register map\n");
|
||
|
|
return PTR_ERR(priv->regmap);
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = regmap_write(priv->regmap, RT4505_REG_RESET, RT4505_RESET_MASK);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(priv->dev, "Failed to reset registers\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
child = fwnode_get_next_available_child_node(client->dev.fwnode, NULL);
|
||
|
|
if (!child) {
|
||
|
|
dev_err(priv->dev, "Failed to get child node\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
init_data.fwnode = child;
|
||
|
|
|
||
|
|
rt4505_init_flash_properties(priv, child);
|
||
|
|
ret = devm_led_classdev_flash_register_ext(priv->dev, &priv->flash,
|
||
|
|
&init_data);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(priv->dev, "Failed to register flash\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
rt4505_init_v4l2_config(priv, &v4l2_config);
|
||
|
|
priv->v4l2_flash = v4l2_flash_init(priv->dev, init_data.fwnode,
|
||
|
|
&priv->flash, &v4l2_flash_ops,
|
||
|
|
&v4l2_config);
|
||
|
|
if (IS_ERR(priv->v4l2_flash)) {
|
||
|
|
dev_err(priv->dev, "Failed to register v4l2 flash\n");
|
||
|
|
return PTR_ERR(priv->v4l2_flash);
|
||
|
|
}
|
||
|
|
|
||
|
|
i2c_set_clientdata(client, priv);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void rt4505_remove(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct rt4505_priv *priv = i2c_get_clientdata(client);
|
||
|
|
|
||
|
|
v4l2_flash_release(priv->v4l2_flash);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void rt4505_shutdown(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct rt4505_priv *priv = i2c_get_clientdata(client);
|
||
|
|
|
||
|
|
/* Reset registers to make sure all off before shutdown */
|
||
|
|
regmap_write(priv->regmap, RT4505_REG_RESET, RT4505_RESET_MASK);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id __maybe_unused rt4505_leds_match[] = {
|
||
|
|
{ .compatible = "richtek,rt4505", },
|
||
|
|
{}
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, rt4505_leds_match);
|
||
|
|
|
||
|
|
static struct i2c_driver rt4505_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "rt4505",
|
||
|
|
.of_match_table = of_match_ptr(rt4505_leds_match),
|
||
|
|
},
|
||
|
|
.probe_new = rt4505_probe,
|
||
|
|
.remove = rt4505_remove,
|
||
|
|
.shutdown = rt4505_shutdown,
|
||
|
|
};
|
||
|
|
module_i2c_driver(rt4505_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
|
||
|
|
MODULE_LICENSE("GPL v2");
|