linux-kernel - [PATCH v2 0/8] Allow f_acm gadgets to notify the user about SetLineCoding requests

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Date:   Tue, 13 Jun 2017 09:52:06 +0300
From:   Tal Shorer <tal.shorer@...il.com>
To:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, gregkh@...uxfoundation.org,
        balbi@...nel.org, corbet@....net
Cc:     Tal Shorer <tal.shorer@...il.com>
Subject: [PATCH v2 0/8] Allow f_acm gadgets to notify the user about SetLineCoding requests

I'm currently working on a project where I'd like to have an omap board
running linux be a usb-to-uart converter (using f_acm), and I've ran
into an issue: there's no way for the application to know if the host
has issued a SetLineCoding requests (after which parity/baudrate should
be changed to match the host's request).

This series adds the support necessary to achieve that:
- Allowing tty drivers to supply a poll() function to notify the user of
        driver-specific events.
- Propagating poll() and ioctl() from u_serial to the next layer (f_acm)
        in this case.
- Let the user read the current line coding set by the host (via an
        ioctl() call).
- Notify the user when there's a pending SetLineCoding request they
        haven't read yet

The last patch also removes up the port_line_config field from
struct gserial. It made no sense to have there (and had a REVISIT
comment at every turn), it was never used and it was initialized with
invalid values.

Changes from v1:
- patch 5 was messed up, which made patch 6 also messed up. fixed both
  of these.

Tal Shorer (8):
  tty: add a poll() callback in struct tty_operations
  usb: gadget: u_serial: propagate poll() to the next layer
  usb: gadget: f_acm: validate set_line_coding requests
  usb: gadget: u_serial: propagate ioctl() to the next layer
  usb: gadget: f_acm: initialize port_line_coding when creating an
    instance
  usb: gadget: f_acm: add an ioctl to get the current line coding
  usb: gadget: f_acm: notify the user on SetLineCoding
  usb: gadget: u_serial: remove port_line_config from struct gserial

 Documentation/ioctl/ioctl-number.txt   |  1 +
 drivers/tty/n_tty.c                    |  2 ++
 drivers/usb/gadget/function/f_acm.c    | 66 +++++++++++++++++++++++++++++-----
 drivers/usb/gadget/function/u_serial.c | 53 ++++++++++++++++-----------
 drivers/usb/gadget/function/u_serial.h |  7 ++--
 include/linux/tty_driver.h             |  3 ++
 include/uapi/linux/usb/f_acm.h         | 12 +++++++
 7 files changed, 113 insertions(+), 31 deletions(-)
 create mode 100644 include/uapi/linux/usb/f_acm.h

--
2.7.4