Commit b6100f10 authored by Pavel Machek's avatar Pavel Machek Committed by Mauro Carvalho Chehab
Browse files

[media] Add device tree support to adp1653 flash driver 



Nokia N900 is switching to device tree, make sure we can use flash
there, too.

Signed-off-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 09f50121

Documentation/devicetree/bindings/media/i2c/adp1653.txt

0 → 100644
+37 −0
Original line number Diff line number Diff line 
* Analog Devices ADP1653 flash LED driver



Required Properties:



  - compatible: Must contain be "adi,adp1653"



  - reg: I2C slave address



  - gpios: References to the GPIO that controls the power for the chip.



There are two led outputs available - flash and indicator. One led is

represented by one child node, nodes need to be named "flash" and "indicator".



Required properties of the LED child node:

- max-microamp : see Documentation/devicetree/bindings/leds/common.txt



Required properties of the flash LED child node:



- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt

- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt



Example:



	adp1653: led-controller@30 {

		compatible = "adi,adp1653";

		reg = <0x30>;

		gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */



		flash {

			flash-timeout-us = <500000>;

			flash-max-microamp = <320000>;

			max-microamp = <50000>;

		};

		indicator {

			max-microamp = <17500>;

		};

	};

drivers/media/i2c/adp1653.c

+81 −9
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 * Contributors:

 *	Sakari Ailus <sakari.ailus@iki.fi>

 *	Tuukka Toivonen <tuukkat76@gmail.com>

 *	Pavel Machek <pavel@ucw.cz>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License
@@ -34,6 +35,8 @@ 
#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/slab.h>

#include <linux/of_gpio.h>

#include <linux/gpio.h>

#include <media/adp1653.h>

#include <media/v4l2-device.h>
@@ -306,9 +309,17 @@ adp1653_init_device(struct adp1653_flash *flash) 
static int

__adp1653_set_power(struct adp1653_flash *flash, int on)

{

	int ret;

	int ret = 0;



	if (flash->platform_data->power) {

		ret = flash->platform_data->power(&flash->subdev, on);

	} else {

		gpio_set_value(flash->platform_data->power_gpio, on);

		if (on)

			/* Some delay is apparently required. */

			udelay(20);

	}



	if (ret < 0)

		return ret;
@@ -316,8 +327,13 @@ __adp1653_set_power(struct adp1653_flash *flash, int on) 
		return 0;



	ret = adp1653_init_device(flash);

	if (ret < 0)

	if (ret >= 0)

		return ret;



	if (flash->platform_data->power)

		flash->platform_data->power(&flash->subdev, 0);

	else

		gpio_set_value(flash->platform_data->power_gpio, 0);



	return ret;

}
@@ -407,21 +423,77 @@ static int adp1653_resume(struct device *dev) 


#endif /* CONFIG_PM */



static int adp1653_of_init(struct i2c_client *client,

			   struct adp1653_flash *flash,

			   struct device_node *node)

{

	u32 val;

	struct adp1653_platform_data *pd;

	enum of_gpio_flags flags;

	int gpio;

	struct device_node *child;



	if (!node)

		return -EINVAL;



	pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);

	if (!pd)

		return -ENOMEM;

	flash->platform_data = pd;



	child = of_get_child_by_name(node, "flash");

	if (!child)

		return -EINVAL;

	if (of_property_read_u32(child, "flash-timeout-microsec", &val))

		return -EINVAL;



	pd->max_flash_timeout = val;

	if (of_property_read_u32(child, "flash-max-microamp", &val))

		return -EINVAL;

	pd->max_flash_intensity = val/1000;



	if (of_property_read_u32(child, "max-microamp", &val))

		return -EINVAL;

	pd->max_torch_intensity = val/1000;



	child = of_get_child_by_name(node, "indicator");

	if (!child)

		return -EINVAL;

	if (of_property_read_u32(child, "max-microamp", &val))

		return -EINVAL;

	pd->max_indicator_intensity = val;



	if (!of_find_property(node, "gpios", NULL)) {

		dev_err(&client->dev, "No gpio node\n");

		return -EINVAL;

	}



	pd->power_gpio = of_get_gpio_flags(node, 0, &flags);

	if (pd->power_gpio < 0) {

		dev_err(&client->dev, "Error getting GPIO\n");

		return -EINVAL;

	}



	return 0;

}





static int adp1653_probe(struct i2c_client *client,

			 const struct i2c_device_id *devid)

{

	struct adp1653_flash *flash;

	int ret;



	/* we couldn't work without platform data */

	if (client->dev.platform_data == NULL)

		return -ENODEV;



	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);

	if (flash == NULL)

		return -ENOMEM;



	flash->platform_data = client->dev.platform_data;

	if (!flash->platform_data) {

		ret = adp1653_of_init(client, flash, client->dev.of_node);

		if (ret)

			return ret;

	}



	mutex_init(&flash->power_lock);
@@ -438,10 +510,10 @@ static int adp1653_probe(struct i2c_client *client, 
		goto free_and_quit;



	flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;



	return 0;



free_and_quit:

	dev_err(&client->dev, "adp1653: failed to register device\n");

	v4l2_ctrl_handler_free(&flash->ctrls);

	return ret;

}
@@ -464,7 +536,7 @@ static const struct i2c_device_id adp1653_id_table[] = { 
};

MODULE_DEVICE_TABLE(i2c, adp1653_id_table);



static struct dev_pm_ops adp1653_pm_ops = {

static const struct dev_pm_ops adp1653_pm_ops = {

	.suspend	= adp1653_suspend,

	.resume		= adp1653_resume,

};