forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
311 lines
7.4 KiB
311 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
// Copyright (C) 2020 Luca Weiss <[email protected]> |
|
|
|
#include <linux/gpio/consumer.h> |
|
#include <linux/led-class-flash.h> |
|
#include <linux/module.h> |
|
#include <linux/regulator/consumer.h> |
|
#include <linux/platform_device.h> |
|
|
|
#include <media/v4l2-flash-led-class.h> |
|
|
|
#define FLASH_TIMEOUT_DEFAULT 250000U /* 250ms */ |
|
#define FLASH_MAX_TIMEOUT_DEFAULT 300000U /* 300ms */ |
|
|
|
struct sgm3140 { |
|
struct led_classdev_flash fled_cdev; |
|
struct v4l2_flash *v4l2_flash; |
|
|
|
struct timer_list powerdown_timer; |
|
|
|
struct gpio_desc *flash_gpio; |
|
struct gpio_desc *enable_gpio; |
|
struct regulator *vin_regulator; |
|
|
|
bool enabled; |
|
|
|
/* current timeout in us */ |
|
u32 timeout; |
|
/* maximum timeout in us */ |
|
u32 max_timeout; |
|
}; |
|
|
|
static struct sgm3140 *flcdev_to_sgm3140(struct led_classdev_flash *flcdev) |
|
{ |
|
return container_of(flcdev, struct sgm3140, fled_cdev); |
|
} |
|
|
|
static int sgm3140_strobe_set(struct led_classdev_flash *fled_cdev, bool state) |
|
{ |
|
struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); |
|
int ret; |
|
|
|
if (priv->enabled == state) |
|
return 0; |
|
|
|
if (state) { |
|
ret = regulator_enable(priv->vin_regulator); |
|
if (ret) { |
|
dev_err(fled_cdev->led_cdev.dev, |
|
"failed to enable regulator: %d\n", ret); |
|
return ret; |
|
} |
|
gpiod_set_value_cansleep(priv->flash_gpio, 1); |
|
gpiod_set_value_cansleep(priv->enable_gpio, 1); |
|
mod_timer(&priv->powerdown_timer, |
|
jiffies + usecs_to_jiffies(priv->timeout)); |
|
} else { |
|
del_timer_sync(&priv->powerdown_timer); |
|
gpiod_set_value_cansleep(priv->enable_gpio, 0); |
|
gpiod_set_value_cansleep(priv->flash_gpio, 0); |
|
ret = regulator_disable(priv->vin_regulator); |
|
if (ret) { |
|
dev_err(fled_cdev->led_cdev.dev, |
|
"failed to disable regulator: %d\n", ret); |
|
return ret; |
|
} |
|
} |
|
|
|
priv->enabled = state; |
|
|
|
return 0; |
|
} |
|
|
|
static int sgm3140_strobe_get(struct led_classdev_flash *fled_cdev, bool *state) |
|
{ |
|
struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); |
|
|
|
*state = timer_pending(&priv->powerdown_timer); |
|
|
|
return 0; |
|
} |
|
|
|
static int sgm3140_timeout_set(struct led_classdev_flash *fled_cdev, |
|
u32 timeout) |
|
{ |
|
struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); |
|
|
|
priv->timeout = timeout; |
|
|
|
return 0; |
|
} |
|
|
|
static const struct led_flash_ops sgm3140_flash_ops = { |
|
.strobe_set = sgm3140_strobe_set, |
|
.strobe_get = sgm3140_strobe_get, |
|
.timeout_set = sgm3140_timeout_set, |
|
}; |
|
|
|
static int sgm3140_brightness_set(struct led_classdev *led_cdev, |
|
enum led_brightness brightness) |
|
{ |
|
struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); |
|
struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); |
|
bool enable = brightness == LED_ON; |
|
int ret; |
|
|
|
if (priv->enabled == enable) |
|
return 0; |
|
|
|
if (enable) { |
|
ret = regulator_enable(priv->vin_regulator); |
|
if (ret) { |
|
dev_err(led_cdev->dev, |
|
"failed to enable regulator: %d\n", ret); |
|
return ret; |
|
} |
|
gpiod_set_value_cansleep(priv->enable_gpio, 1); |
|
} else { |
|
gpiod_set_value_cansleep(priv->enable_gpio, 0); |
|
ret = regulator_disable(priv->vin_regulator); |
|
if (ret) { |
|
dev_err(led_cdev->dev, |
|
"failed to disable regulator: %d\n", ret); |
|
return ret; |
|
} |
|
} |
|
|
|
priv->enabled = enable; |
|
|
|
return 0; |
|
} |
|
|
|
static void sgm3140_powerdown_timer(struct timer_list *t) |
|
{ |
|
struct sgm3140 *priv = from_timer(priv, t, powerdown_timer); |
|
|
|
gpiod_set_value(priv->enable_gpio, 0); |
|
gpiod_set_value(priv->flash_gpio, 0); |
|
regulator_disable(priv->vin_regulator); |
|
|
|
priv->enabled = false; |
|
} |
|
|
|
static void sgm3140_init_flash_timeout(struct sgm3140 *priv) |
|
{ |
|
struct led_classdev_flash *fled_cdev = &priv->fled_cdev; |
|
struct led_flash_setting *s; |
|
|
|
/* Init flash timeout setting */ |
|
s = &fled_cdev->timeout; |
|
s->min = 1; |
|
s->max = priv->max_timeout; |
|
s->step = 1; |
|
s->val = FLASH_TIMEOUT_DEFAULT; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) |
|
static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv, |
|
struct v4l2_flash_config *v4l2_sd_cfg) |
|
{ |
|
struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev; |
|
struct led_flash_setting *s; |
|
|
|
strscpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name, |
|
sizeof(v4l2_sd_cfg->dev_name)); |
|
|
|
/* Init flash intensity setting */ |
|
s = &v4l2_sd_cfg->intensity; |
|
s->min = 0; |
|
s->max = 1; |
|
s->step = 1; |
|
s->val = 1; |
|
} |
|
|
|
#else |
|
static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv, |
|
struct v4l2_flash_config *v4l2_sd_cfg) |
|
{ |
|
} |
|
#endif |
|
|
|
static int sgm3140_probe(struct platform_device *pdev) |
|
{ |
|
struct sgm3140 *priv; |
|
struct led_classdev *led_cdev; |
|
struct led_classdev_flash *fled_cdev; |
|
struct led_init_data init_data = {}; |
|
struct fwnode_handle *child_node; |
|
struct v4l2_flash_config v4l2_sd_cfg = {}; |
|
int ret; |
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
|
if (!priv) |
|
return -ENOMEM; |
|
|
|
priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW); |
|
ret = PTR_ERR_OR_ZERO(priv->flash_gpio); |
|
if (ret) |
|
return dev_err_probe(&pdev->dev, ret, |
|
"Failed to request flash gpio\n"); |
|
|
|
priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW); |
|
ret = PTR_ERR_OR_ZERO(priv->enable_gpio); |
|
if (ret) |
|
return dev_err_probe(&pdev->dev, ret, |
|
"Failed to request enable gpio\n"); |
|
|
|
priv->vin_regulator = devm_regulator_get(&pdev->dev, "vin"); |
|
ret = PTR_ERR_OR_ZERO(priv->vin_regulator); |
|
if (ret) |
|
return dev_err_probe(&pdev->dev, ret, |
|
"Failed to request regulator\n"); |
|
|
|
child_node = fwnode_get_next_available_child_node(pdev->dev.fwnode, |
|
NULL); |
|
if (!child_node) { |
|
dev_err(&pdev->dev, |
|
"No fwnode child node found for connected LED.\n"); |
|
return -EINVAL; |
|
} |
|
|
|
ret = fwnode_property_read_u32(child_node, "flash-max-timeout-us", |
|
&priv->max_timeout); |
|
if (ret) { |
|
priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT; |
|
dev_warn(&pdev->dev, |
|
"flash-max-timeout-us property missing\n"); |
|
} |
|
|
|
/* |
|
* Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout |
|
* from DT is lower. |
|
*/ |
|
priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT); |
|
|
|
timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0); |
|
|
|
fled_cdev = &priv->fled_cdev; |
|
led_cdev = &fled_cdev->led_cdev; |
|
|
|
fled_cdev->ops = &sgm3140_flash_ops; |
|
|
|
led_cdev->brightness_set_blocking = sgm3140_brightness_set; |
|
led_cdev->max_brightness = LED_ON; |
|
led_cdev->flags |= LED_DEV_CAP_FLASH; |
|
|
|
sgm3140_init_flash_timeout(priv); |
|
|
|
init_data.fwnode = child_node; |
|
|
|
platform_set_drvdata(pdev, priv); |
|
|
|
/* Register in the LED subsystem */ |
|
ret = devm_led_classdev_flash_register_ext(&pdev->dev, |
|
fled_cdev, &init_data); |
|
if (ret) { |
|
dev_err(&pdev->dev, "Failed to register flash device: %d\n", |
|
ret); |
|
goto err; |
|
} |
|
|
|
sgm3140_init_v4l2_flash_config(priv, &v4l2_sd_cfg); |
|
|
|
/* Create V4L2 Flash subdev */ |
|
priv->v4l2_flash = v4l2_flash_init(&pdev->dev, |
|
child_node, |
|
fled_cdev, NULL, |
|
&v4l2_sd_cfg); |
|
if (IS_ERR(priv->v4l2_flash)) { |
|
ret = PTR_ERR(priv->v4l2_flash); |
|
goto err; |
|
} |
|
|
|
return ret; |
|
|
|
err: |
|
fwnode_handle_put(child_node); |
|
return ret; |
|
} |
|
|
|
static int sgm3140_remove(struct platform_device *pdev) |
|
{ |
|
struct sgm3140 *priv = platform_get_drvdata(pdev); |
|
|
|
del_timer_sync(&priv->powerdown_timer); |
|
|
|
v4l2_flash_release(priv->v4l2_flash); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct of_device_id sgm3140_dt_match[] = { |
|
{ .compatible = "sgmicro,sgm3140" }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, sgm3140_dt_match); |
|
|
|
static struct platform_driver sgm3140_driver = { |
|
.probe = sgm3140_probe, |
|
.remove = sgm3140_remove, |
|
.driver = { |
|
.name = "sgm3140", |
|
.of_match_table = sgm3140_dt_match, |
|
}, |
|
}; |
|
|
|
module_platform_driver(sgm3140_driver); |
|
|
|
MODULE_AUTHOR("Luca Weiss <[email protected]>"); |
|
MODULE_DESCRIPTION("SG Micro SGM3140 charge pump LED driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|