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SubjectRe: [PATCHv7] media: i2c/adp1653: Devicetree support for adp1653
Hi Pavel,

(Cc linux-media. Media related patches should be sent there.)

On Thu, Apr 09, 2015 at 09:42:38AM +0200, Pavel Machek wrote:
>
> Add device tree support for adp1653 flash LED driver.
>
> Signed-off-by: Pavel Machek <pavel@ucw.cz>
>
> ---
>
> Second part of a patch after documentation was merged.
>
> Please apply,
> Pavel
>
> diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
> index 873fe19..d703636 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>

As Sebastian suggested, linux/of.h and linux/gpio/consumer.h should be used.

> #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 {
> + gpiod_set_value(flash->platform_data->enable_gpio, on);
> + if (on)
> + /* Some delay is apparently required. */
> + udelay(20);
> + }
>
> - ret = flash->platform_data->power(&flash->subdev, on);
> if (ret < 0)
> return ret;

Please check ret after assigning it. The assignment in declaration is
unnecessary.

>
> @@ -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
> + gpiod_set_value(flash->platform_data->enable_gpio, 0);
>
> return ret;
> }
> @@ -407,21 +423,78 @@ 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;
> + struct device_node *child = NULL;

The NULL assignment can be removed.

> +
> + if (!node)
> + return -EINVAL;

node is always non-NULL here; no need to check.

> +
> + 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-us", &val))

You could read the values directly to the appropriate struct
adp1653_platform_data field.

> + goto err;
> +
> + pd->max_flash_timeout = val;
> + if (of_property_read_u32(child, "flash-max-microamp", &val))
> + goto err;
> + pd->max_flash_intensity = val/1000;
> +
> + if (of_property_read_u32(child, "max-microamp", &val))
> + goto err;
> + pd->max_torch_intensity = val/1000;
> + of_node_put(child);
> +
> + child = of_get_child_by_name(node, "indicator");
> + if (!child)
> + return -EINVAL;
> + if (of_property_read_u32(child, "max-microamp", &val))

Let's wait a bit the resolution of the property name. I'm in principle fine
with both. I can do the change once it's been decided, hopefully very soon.

> + goto err;
> + pd->max_indicator_intensity = val;
> +
> + of_node_put(child);
> +
> + pd->enable_gpio = devm_gpiod_get(&client->dev, "enable");
> + if (!pd->enable_gpio) {
> + dev_err(&client->dev, "Error getting GPIO\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +err:
> + dev_err(&client->dev, "Required property not found\n");
> + of_node_put(child);
> + return -EINVAL;
> +}
> +
> +
> 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;

I think it'd be cleaner to make the assignment only if not using of, i.e.
add else branch to the if below.

> + if (client->dev.of_node) {
> + ret = adp1653_of_init(client, flash, client->dev.of_node);
> + if (ret)
> + return ret;
> + }
>
> mutex_init(&flash->power_lock);
>
> @@ -442,6 +515,7 @@ static int adp1653_probe(struct i2c_client *client,
> 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 +538,7 @@ 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/include/media/adp1653.h b/include/media/adp1653.h
> index 1d9b48a..34b505e 100644
> --- a/include/media/adp1653.h
> +++ b/include/media/adp1653.h
> @@ -100,9 +100,11 @@ struct adp1653_platform_data {
> int (*power)(struct v4l2_subdev *sd, int on);
>
> u32 max_flash_timeout; /* flash light timeout in us */
> - u32 max_flash_intensity; /* led intensity, flash mode */
> - u32 max_torch_intensity; /* led intensity, torch mode */
> - u32 max_indicator_intensity; /* indicator led intensity */
> + u32 max_flash_intensity; /* led intensity, flash mode, mA */
> + u32 max_torch_intensity; /* led intensity, torch mode, mA */
> + u32 max_indicator_intensity; /* indicator led intensity, uA */
> +
> + struct gpio_desc *enable_gpio; /* for device-tree based boot */
> };
>
> #define to_adp1653_flash(sd) container_of(sd, struct adp1653_flash, subdev)
>

Let me know if you're going to send v8 or if I can make the changes. I think
we're pretty much done then.

--
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi XMPP: sailus@retiisi.org.uk


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