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serdev: Introduce devm_serdev_device_open() 

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()).

Acked-by: Philippe Ombredanne <pombredanne@nexb.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
hifive-unleashed-5.1
Andrey Smirnov 2017-12-20 22:51:15 -08:00 committed by Lee Jones
parent c5ff7de262
commit 2cb67d20cd
3 changed files with 31 additions and 0 deletions
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3
Documentation/driver-model/devres.txt
View File

@ -384,6 +384,9 @@ RESET
devm_reset_control_get()
devm_reset_controller_register()
SERDEV
devm_serdev_device_open()
SLAVE DMA ENGINE
devm_acpi_dma_controller_register()

27
drivers/tty/serdev/core.c
View File

@ -132,6 +132,33 @@ 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 0;
}
EXPORT_SYMBOL_GPL(devm_serdev_device_open);
void serdev_device_write_wakeup(struct serdev_device *serdev)
{
complete(&serdev->write_comp);

1
include/linux/serdev.h
View File

@ -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);