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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2017-04-04 17:22:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-08 19:51:00 +0300 |
| commit | 6fe729c4bdae41b4c5a5ff21312f021a48c69399 (patch) | |
| tree | 46e1fef43bf9104c00638fc2e40df99226833799 /include/linux | |
| parent | e1dc9b08051a2c2e694edf48d1e704f07c7c143c (diff) | |
| download | linux-6fe729c4bdae41b4c5a5ff21312f021a48c69399.tar.xz | |
serdev: Add serdev_device_write subroutine
Add serdev_device_write() a blocking call allowing to transfer
arbitraty amount of data (potentially exceeding amount that
serdev_device_write_buf can process in a single call)
To support that, also add serdev_device_write_wakeup().
Drivers wanting to use full extent of serdev_device_write
functionality are expected to provide serdev_device_write_wakeup() as
a sole handler of .write_wakeup event or call it as a part of driver's
custom .write_wakeup code.
Because serdev_device_write() subroutine is a superset of
serdev_device_write_buf() the patch re-impelements latter is terms of
the former. For drivers wanting to just use serdev_device_write_buf()
.write_wakeup handler is optional.
Cc: cphealy@gmail.com
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/serdev.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/include/linux/serdev.h b/include/linux/serdev.h index 5176cdc2057f..0beaff886992 100644 --- a/include/linux/serdev.h +++ b/include/linux/serdev.h @@ -39,12 +39,16 @@ struct serdev_device_ops { * @nr: Device number on serdev bus. * @ctrl: serdev controller managing this device. * @ops: Device operations. + * @write_comp Completion used by serdev_device_write() internally + * @write_lock Lock to serialize access when writing data */ struct serdev_device { struct device dev; int nr; struct serdev_controller *ctrl; const struct serdev_device_ops *ops; + struct completion write_comp; + struct mutex write_lock; }; static inline struct serdev_device *to_serdev_device(struct device *d) @@ -186,7 +190,8 @@ int serdev_device_open(struct serdev_device *); void serdev_device_close(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); +void serdev_device_write_wakeup(struct serdev_device *); +int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, unsigned long); void serdev_device_write_flush(struct serdev_device *); int serdev_device_write_room(struct serdev_device *); @@ -223,7 +228,8 @@ static inline unsigned int serdev_device_set_baudrate(struct serdev_device *sdev return 0; } static inline void serdev_device_set_flow_control(struct serdev_device *sdev, bool enable) {} -static inline int serdev_device_write_buf(struct serdev_device *sdev, const unsigned char *buf, size_t count) +static inline int serdev_device_write(struct serdev_device *sdev, const unsigned char *buf, + size_t count, unsigned long timeout) { return -ENODEV; } @@ -259,4 +265,11 @@ static inline struct device *serdev_tty_port_register(struct tty_port *port, static inline void serdev_tty_port_unregister(struct tty_port *port) {} #endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */ +static inline int serdev_device_write_buf(struct serdev_device *serdev, + const unsigned char *data, + size_t count) +{ + return serdev_device_write(serdev, data, count, 0); +} + #endif /*_LINUX_SERDEV_H */ |