#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/led-class-flash.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <media/v4l2-flash-led-class.h>
#define RT4505_REG_RESET 0x0
#define RT4505_REG_CONFIG 0x8
#define RT4505_REG_ILED 0x9
#define RT4505_REG_ENABLE 0xA
#define RT4505_REG_FLAGS 0xB
#define RT4505_RESET_MASK BIT(7)
#define RT4505_FLASHTO_MASK GENMASK(2, 0)
#define RT4505_ITORCH_MASK GENMASK(7, 5)
#define RT4505_ITORCH_SHIFT 5
#define RT4505_IFLASH_MASK GENMASK(4, 0)
#define RT4505_ENABLE_MASK GENMASK(5, 0)
#define RT4505_TORCH_SET (BIT(0) | BIT(4))
#define RT4505_FLASH_SET (BIT(0) | BIT(1) | BIT(2) | BIT(4))
#define RT4505_EXT_FLASH_SET (BIT(0) | BIT(1) | BIT(4) | BIT(5))
#define RT4505_FLASH_GET (BIT(0) | BIT(1) | BIT(4))
#define RT4505_OVP_MASK BIT(3)
#define RT4505_SHORT_MASK BIT(2)
#define RT4505_OTP_MASK BIT(1)
#define RT4505_TIMEOUT_MASK BIT(0)
#define RT4505_ITORCH_MINUA 46000
#define RT4505_ITORCH_MAXUA 375000
#define RT4505_ITORCH_STPUA 47000
#define RT4505_IFLASH_MINUA 93750
#define RT4505_IFLASH_MAXUA 1500000
#define RT4505_IFLASH_STPUA 93750
#define RT4505_FLASHTO_MINUS 100000
#define RT4505_FLASHTO_MAXUS 800000
#define RT4505_FLASHTO_STPUS 100000
struct rt4505_priv {
struct device *dev;
struct regmap *regmap;
struct mutex lock;
struct led_classdev_flash flash;
struct v4l2_flash *v4l2_flash;
};
static int rt4505_torch_brightness_set(struct led_classdev *lcdev,
enum led_brightness level)
{
struct rt4505_priv *priv =
container_of(lcdev, struct rt4505_priv, flash.led_cdev);
u32 val = 0;
int ret;
mutex_lock(&priv->lock);
if (level != LED_OFF) {
ret = regmap_update_bits(priv->regmap,
RT4505_REG_ILED, RT4505_ITORCH_MASK,
(level - 1) << RT4505_ITORCH_SHIFT);
if (ret)
goto unlock;
val = RT4505_TORCH_SET;
}
ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
RT4505_ENABLE_MASK, val);
unlock:
mutex_unlock(&priv->lock);
return ret;
}
static enum led_brightness rt4505_torch_brightness_get(
struct led_classdev *lcdev)
{
struct rt4505_priv *priv =
container_of(lcdev, struct rt4505_priv, flash.led_cdev);
u32 val;
int ret;
mutex_lock(&priv->lock);
ret = regmap_read(priv->regmap, RT4505_REG_ENABLE, &val);
if (ret) {
dev_err(lcdev->dev, "Failed to get LED enable\n");
ret = LED_OFF;
goto unlock;
}
if ((val & RT4505_ENABLE_MASK) != RT4505_TORCH_SET) {
ret = LED_OFF;
goto unlock;
}
ret = regmap_read(priv->regmap, RT4505_REG_ILED, &val);
if (ret) {
dev_err(lcdev->dev, "Failed to get LED brightness\n");
ret = LED_OFF;
goto unlock;
}
ret = ((val & RT4505_ITORCH_MASK) >> RT4505_ITORCH_SHIFT) + 1;
unlock:
mutex_unlock(&priv->lock);
return ret;
}
static int rt4505_flash_brightness_set(struct led_classdev_flash *fled_cdev,
u32 brightness)
{
struct rt4505_priv *priv =
container_of(fled_cdev, struct rt4505_priv, flash);
struct led_flash_setting *s = &fled_cdev->brightness;
u32 val = (brightness - s->min) / s->step;
int ret;
mutex_lock(&priv->lock);
ret = regmap_update_bits(priv->regmap, RT4505_REG_ILED,
RT4505_IFLASH_MASK, val);
mutex_unlock(&priv->lock);
return ret;
}
static int rt4505_flash_strobe_set(struct led_classdev_flash *fled_cdev,
bool state)
{
struct rt4505_priv *priv =
container_of(fled_cdev, struct rt4505_priv, flash);
u32 val = state ? RT4505_FLASH_SET : 0;
int ret;
mutex_lock(&priv->lock);
ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
RT4505_ENABLE_MASK, val);
mutex_unlock(&priv->lock);
return ret;
}
static int rt4505_flash_strobe_get(struct led_classdev_flash *fled_cdev,
bool *state)
{
struct rt4505_priv *priv =
container_of(fled_cdev, struct rt4505_priv, flash);
u32 val;
int ret;
mutex_lock(&priv->lock);
ret = regmap_read(priv->regmap, RT4505_REG_ENABLE, &val);
if (ret)
goto unlock;
*state = (val & RT4505_FLASH_GET) == RT4505_FLASH_GET;
unlock:
mutex_unlock(&priv->lock);
return ret;
}
static int rt4505_flash_timeout_set(struct led_classdev_flash *fled_cdev,
u32 timeout)
{
struct rt4505_priv *priv =
container_of(fled_cdev, struct rt4505_priv, flash);
struct led_flash_setting *s = &fled_cdev->timeout;
u32 val = (timeout - s->min) / s->step;
int ret;
mutex_lock(&priv->lock);
ret = regmap_update_bits(priv->regmap, RT4505_REG_CONFIG,
RT4505_FLASHTO_MASK, val);
mutex_unlock(&priv->lock);
return ret;
}
static int rt4505_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
{
struct rt4505_priv *priv =
container_of(fled_cdev, struct rt4505_priv, flash);
u32 val, led_faults = 0;
int ret;
ret = regmap_read(priv->regmap, RT4505_REG_FLAGS, &val);
if (ret)
return ret;
if (val & RT4505_OVP_MASK)
led_faults |= LED_FAULT_OVER_VOLTAGE;
if (val & RT4505_SHORT_MASK)
led_faults |= LED_FAULT_SHORT_CIRCUIT;
if (val & RT4505_OTP_MASK)
led_faults |= LED_FAULT_OVER_TEMPERATURE;
if (val & RT4505_TIMEOUT_MASK)
led_faults |= LED_FAULT_TIMEOUT;
*fault = led_faults;
return 0;
}
static const struct led_flash_ops rt4505_flash_ops = {
.flash_brightness_set = rt4505_flash_brightness_set,
.strobe_set = rt4505_flash_strobe_set,
.strobe_get = rt4505_flash_strobe_get,
.timeout_set = rt4505_flash_timeout_set,
.fault_get = rt4505_fault_get,
};
static bool rt4505_is_accessible_reg(struct device *dev, unsigned int reg)
{
if (reg == RT4505_REG_RESET ||
(reg >= RT4505_REG_CONFIG && reg <= RT4505_REG_FLAGS))
return true;
return false;
}
static const struct regmap_config rt4505_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RT4505_REG_FLAGS,
.readable_reg = rt4505_is_accessible_reg,
.writeable_reg = rt4505_is_accessible_reg,
};
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
static int rt4505_flash_external_strobe_set(struct v4l2_flash *v4l2_flash,
bool enable)
{
struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
struct rt4505_priv *priv =
container_of(flash, struct rt4505_priv, flash);
u32 val = enable ? RT4505_EXT_FLASH_SET : 0;
int ret;
mutex_lock(&priv->lock);
ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
RT4505_ENABLE_MASK, val);
mutex_unlock(&priv->lock);
return ret;
}
static const struct v4l2_flash_ops v4l2_flash_ops = {
.external_strobe_set = rt4505_flash_external_strobe_set,
};
static void rt4505_init_v4l2_config(struct rt4505_priv *priv,
struct v4l2_flash_config *config)
{
struct led_classdev_flash *flash = &priv->flash;
struct led_classdev *lcdev = &flash->led_cdev;
struct led_flash_setting *s;
strscpy(config->dev_name, lcdev->dev->kobj.name,
sizeof(config->dev_name));
s = &config->intensity;
s->min = RT4505_ITORCH_MINUA;
s->step = RT4505_ITORCH_STPUA;
s->max = s->val = s->min + (lcdev->max_brightness - 1) * s->step;
config->flash_faults = LED_FAULT_OVER_VOLTAGE |
LED_FAULT_SHORT_CIRCUIT |
LED_FAULT_LED_OVER_TEMPERATURE |
LED_FAULT_TIMEOUT;
config->has_external_strobe = 1;
}
#else
static const struct v4l2_flash_ops v4l2_flash_ops;
static void rt4505_init_v4l2_config(struct rt4505_priv *priv,
struct v4l2_flash_config *config)
{
}
#endif
static void rt4505_init_flash_properties(struct rt4505_priv *priv,
struct fwnode_handle *child)
{
struct led_classdev_flash *flash = &priv->flash;
struct led_classdev *lcdev = &flash->led_cdev;
struct led_flash_setting *s;
u32 val;
int ret;
ret = fwnode_property_read_u32(child, "led-max-microamp", &val);
if (ret) {
dev_warn(priv->dev, "led-max-microamp DT property missing\n");
val = RT4505_ITORCH_MINUA;
} else
val = clamp_val(val, RT4505_ITORCH_MINUA, RT4505_ITORCH_MAXUA);
lcdev->max_brightness =
(val - RT4505_ITORCH_MINUA) / RT4505_ITORCH_STPUA + 1;
lcdev->brightness_set_blocking = rt4505_torch_brightness_set;
lcdev->brightness_get = rt4505_torch_brightness_get;
lcdev->flags |= LED_DEV_CAP_FLASH;
ret = fwnode_property_read_u32(child, "flash-max-microamp", &val);
if (ret) {
dev_warn(priv->dev, "flash-max-microamp DT property missing\n");
val = RT4505_IFLASH_MINUA;
} else
val = clamp_val(val, RT4505_IFLASH_MINUA, RT4505_IFLASH_MAXUA);
s = &flash->brightness;
s->min = RT4505_IFLASH_MINUA;
s->step = RT4505_IFLASH_STPUA;
s->max = s->val = val;
ret = fwnode_property_read_u32(child, "flash-max-timeout-us", &val);
if (ret) {
dev_warn(priv->dev,
"flash-max-timeout-us DT property missing\n");
val = RT4505_FLASHTO_MINUS;
} else
val = clamp_val(val, RT4505_FLASHTO_MINUS,
RT4505_FLASHTO_MAXUS);
s = &flash->timeout;
s->min = RT4505_FLASHTO_MINUS;
s->step = RT4505_FLASHTO_STPUS;
s->max = s->val = val;
flash->ops = &rt4505_flash_ops;
}
static int rt4505_probe(struct i2c_client *client)
{
struct rt4505_priv *priv;
struct fwnode_handle *child;
struct led_init_data init_data = {};
struct v4l2_flash_config v4l2_config = {};
int ret;
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &client->dev;
mutex_init(&priv->lock);
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 = device_get_next_child_node(&client->dev, 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);
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 = rt4505_probe,
.remove = rt4505_remove,
.shutdown = rt4505_shutdown,
};
module_i2c_driver(rt4505_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT4505 LED driver");
MODULE_LICENSE("GPL v2");
