Re: [PATCH] Add device tree support to adp1653 flash driver

Pavel Machek
2015-03-23T11:34:32Z

Hi!

> Nokia N900 is switching to device tree, make sure we can use flash
> there, too.
>
> Signed-off-by: Pavel Machek <pavel@ucw.cz>

Sakari, you are marked as a matinainer for this driver. Can you take
the patch so that it makes it into 4.1?

Thanks,
Pavel

> diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
> index 873fe19..0341009 100644
> --- a/drivers/media/i2c/adp1653.c
> +++ b/drivers/media/i2c/adp1653.c
> @@ -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);
> + }
>
> - ret = flash->platform_data->power(&flash->subdev, on);
> 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,
> };
> diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> new file mode 100644
> index 0000000..0fc28a9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
> @@ -0,0 +1,37 @@
> +* 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>;
> + };
> + };
>

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html