kernel/linux.git/include/linux/usb/serial.h, branch v5.13.12

USB: serial: add generic support for TIOCSSERIAL

2021-04-08T07:46:02+00:00

TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. The closing_wait parameter determines how long to wait for the transfer buffers to drain during close and the default timeout of 30 seconds may not be sufficient at low line speeds. In other cases, when for example flow is stopped, the default timeout may instead be too long. Add generic support for TIOCSSERIAL and TIOCGSERIAL with handling of the three common parameters close_delay, closing_wait and line for the benefit of all USB serial drivers while still allowing drivers to implement further functionality through the existing callbacks. This currently includes a few drivers that report their base baud clock rate even if that is really only of interest when setting custom divisors through the deprecated ASYNC_SPD_CUST interface; an interface which only the FTDI driver actually implements. Some drivers have also been reporting back a fake UART type, something which should no longer be needed and will be dropped by a follow-on patch. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

USB: serial: add support for multi-interface functions

2021-04-01T08:04:07+00:00

A single USB function can be implemented using a group of interfaces and this is for example commonly used for Communication Class devices. Add support for multi-interface functions to USB serial core and export an interface that allows drivers to claim a second sibling interface. The interface could easily be extended to allow claiming further interfaces if ever needed. When a driver claims a sibling interface in probe(), core allocates resources for any bulk in, bulk out, interrupt in and interrupt out endpoints found also on the sibling interface. Disconnect is implemented so that unbinding either interface will release the other interface while disconnect() is called precisely once. Similarly, suspend() is called when the first sibling interface is suspended and resume() is called when the last sibling interface is resumed by USB core. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

USB: serial: drop unused suspending flag

2021-04-01T08:03:45+00:00

The suspending flag was added back in 2009 but no users ever followed. Remove it. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

USB: serial: make remove callback return void

2021-02-09T12:13:58+00:00

All usb_serial drivers return 0 in their remove callbacks and driver core ignores the value returned by usb_serial_device_remove(). So change the remove callback to return void and return 0 unconditionally in usb_serial_device_remove(). Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20210208143149.963644-2-uwe@kleine-koenig.org Signed-off-by: Johan Hovold

USB: serial: remove write wait queue

2020-11-04T10:11:29+00:00

The digi_acceleport driver is the only driver still using the port write wake queue so move it to that driver's port data. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

Merge tag 'usb-serial-5.9-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next

2020-07-28T15:33:10+00:00

Johan writes: USB-serial updates for 5.9-rc1 Here are the USB-serial updates for 5.9-rc1, including: - console flow-control support - simulated line-breaks on some ch341 - hardware flow-control fixes for cp210x - break-detection and sysrq fixes for ftdi_sio - sysrq optimisations - input parity checking for cp210x Included are also some new device ids and various clean ups. All have been in linux-next with no reported issues. * tag 'usb-serial-5.9-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial: (31 commits) USB: serial: qcserial: add EM7305 QDL product ID USB: serial: iuu_phoenix: fix led-activity helpers USB: serial: sierra: clean up special-interface handling USB: serial: cp210x: use in-kernel types in port data USB: serial: cp210x: drop unnecessary packed attributes USB: serial: cp210x: add support for TIOCGICOUNT USB: serial: cp210x: add support for line-status events USB: serial: cp210x: disable interface on errors in open USB: serial: drop redundant transfer-buffer casts USB: serial: drop extern keyword from function declarations USB: serial: drop unnecessary sysrq include USB: serial: add sysrq break-handler dummy USB: serial: inline sysrq dummy function USB: serial: only process sysrq when enabled USB: serial: only set sysrq timestamp for consoles USB: serial: ftdi_sio: fix break and sysrq handling USB: serial: ftdi_sio: clean up receive processing USB: serial: ftdi_sio: make process-packet buffer unsigned USB: serial: use fallthrough pseudo-keyword USB: serial: ch341: fix missing simulated-break margin ...

usb: linux/usb/serial.h: drop duplicated word in comment

2020-07-15T14:48:11+00:00

Drop the doubled word "set" in a comment. Signed-off-by: Randy Dunlap Cc: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org Link: https://lore.kernel.org/r/20200715045701.22949-4-rdunlap@infradead.org Signed-off-by: Greg Kroah-Hartman

USB: serial: drop extern keyword from function declarations

2020-07-09T07:20:14+00:00

Drop the redundant extern keyword from function declarations in the subsystem header file to improve readability (and make it easier to spot the global variables). Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

USB: serial: drop unnecessary sysrq include

2020-07-09T07:20:12+00:00

There's no need to include sysrq.h in the subsystem header. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold

USB: serial: add sysrq break-handler dummy

2020-07-09T07:20:10+00:00

Add inline sysrq break-handler dummy to allow the compiler to eliminate further code when either console or sysrq support isn't enabled and to clearly mark the two sysrq functions as belonging together. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold