Hi,
On Wed, Oct 18, 2017 at 10:01:33AM -0700, Andrey Smirnov wrote:
> Add code implementing managed version of serdev_device_open() for
> serdev device drivers that "open" the device during driver's lifecycle
> only once (e.g. opened in .probe() and closed in .remove()).
>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-serial@xxxxxxxxxxxxxxx
> Cc: Rob Herring <robh@xxxxxxxxxx>
> Cc: cphealy@xxxxxxxxx
> Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Cc: Nikita Yushchenko <nikita.yoush@xxxxxxxxxxxxxxxxxx>
> Cc: Lee Jones <lee.jones@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Pavel Machek <pavel@xxxxxx>
> Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
> Cc: Johan Hovold <johan@xxxxxxxxxx>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
> ---
Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxxxx>
-- Sebastian
> Documentation/driver-model/devres.txt | 3 +++
> drivers/tty/serdev/core.c | 27 +++++++++++++++++++++++++++
> include/linux/serdev.h | 1 +
> 3 files changed, 31 insertions(+)
>
> diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
> index 69f08c0f23a8..e9c6b5cfeec1 100644
> --- a/Documentation/driver-model/devres.txt
> +++ b/Documentation/driver-model/devres.txt
> @@ -383,6 +383,9 @@ RESET
> devm_reset_control_get()
> devm_reset_controller_register()
>
> +SERDEV
> + devm_serdev_device_open()
> +
> SLAVE DMA ENGINE
> devm_acpi_dma_controller_register()
>
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index f500f6a2ca88..b3a785665c6f 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -116,6 +116,33 @@ void serdev_device_close(struct serdev_device *serdev)
> }
> EXPORT_SYMBOL_GPL(serdev_device_close);
>
> +static void devm_serdev_device_release(struct device *dev, void *dr)
> +{
> + serdev_device_close(*(struct serdev_device **)dr);
> +}
> +
> +int devm_serdev_device_open(struct device *dev, struct serdev_device *serdev)
> +{
> + struct serdev_device **dr;
> + int ret;
> +
> + dr = devres_alloc(devm_serdev_device_release, sizeof(*dr), GFP_KERNEL);
> + if (!dr)
> + return -ENOMEM;
> +
> + ret = serdev_device_open(serdev);
> + if (ret) {
> + devres_free(dr);
> + return ret;
> + }
> +
> + *dr = serdev;
> + devres_add(dev, dr);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(devm_serdev_device_open);
> +
> void serdev_device_write_wakeup(struct serdev_device *serdev)
> {
> complete(&serdev->write_comp);
> diff --git a/include/linux/serdev.h b/include/linux/serdev.h
> index e69402d4a8ae..9929063bd45d 100644
> --- a/include/linux/serdev.h
> +++ b/include/linux/serdev.h
> @@ -193,6 +193,7 @@ static inline int serdev_controller_receive_buf(struct serdev_controller *ctrl,
>
> int serdev_device_open(struct serdev_device *);
> void serdev_device_close(struct serdev_device *);
> +int devm_serdev_device_open(struct device *, struct serdev_device *);
> unsigned int serdev_device_set_baudrate(struct serdev_device *, unsigned int);
> void serdev_device_set_flow_control(struct serdev_device *, bool);
> int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_t);
> --
> 2.13.5
>
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