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![Alan Cox](/assets/img/avatar_default.png)
This now refcounts but doesn't actually check the reference was obtained in all the places it should. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1858 lines
57 KiB
C
1858 lines
57 KiB
C
/*
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* Digi AccelePort USB-4 and USB-2 Serial Converters
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*
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* Copyright 2000 by Digi International
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
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* usb-serial driver.
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*
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* Peter Berger (pberger@brimson.com)
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* Al Borchers (borchers@steinerpoint.com)
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*
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* (12/03/2001) gkh
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* switched to using port->port.count instead of private version.
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* Removed port->active
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*
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* (04/08/2001) gb
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* Identify version on module load.
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*
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* (11/01/2000) Adam J. Richter
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* usb_device_id table support
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*
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* (11/01/2000) pberger and borchers
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* -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused
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* USB 4 ports to hang on startup.
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* -- Serialized access to write urbs by adding the dp_write_urb_in_use
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* flag; otherwise, the driver caused SMP system hangs. Watching the
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* urb status is not sufficient.
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*
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* (10/05/2000) gkh
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* -- Fixed bug with urb->dev not being set properly, now that the usb
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* core needs it.
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*
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* (8/8/2000) pberger and borchers
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* -- Fixed close so that
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* - it can timeout while waiting for transmit idle, if needed;
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* - it ignores interrupts when flushing the port, turning
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* of modem signalling, and so on;
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* - it waits for the flush to really complete before returning.
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* -- Read_bulk_callback and write_bulk_callback check for a closed
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* port before using the tty struct or writing to the port.
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* -- The two changes above fix the oops caused by interrupted closes.
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* -- Added interruptible args to write_oob_command and set_modem_signals
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* and added a timeout arg to transmit_idle; needed for fixes to
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* close.
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* -- Added code for rx_throttle and rx_unthrottle so that input flow
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* control works.
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* -- Added code to set overrun, parity, framing, and break errors
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* (untested).
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* -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length
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* bulk writes are done. These hung the Digi USB device. The
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* 0 length bulk writes were a new feature of usb-uhci added in
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* the 2.4.0-test6 kernels.
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* -- Fixed mod inc race in open; do mod inc before sleeping to wait
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* for a close to finish.
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*
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* (7/31/2000) pberger
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* -- Fixed bugs with hardware handshaking:
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* - Added code to set/clear tty->hw_stopped in digi_read_oob_callback()
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* and digi_set_termios()
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* -- Added code in digi_set_termios() to
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* - add conditional in code handling transition from B0 to only
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* set RTS if RTS/CTS flow control is either not in use or if
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* the port is not currently throttled.
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* - handle turning off CRTSCTS.
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*
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* (7/30/2000) borchers
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* -- Added support for more than one Digi USB device by moving
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* globals to a private structure in the pointed to from the
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* usb_serial structure.
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* -- Moved the modem change and transmit idle wait queues into
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* the port private structure, so each port has its own queue
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* rather than sharing global queues.
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* -- Added support for break signals.
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*
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* (7/25/2000) pberger
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* -- Added USB-2 support. Note: the USB-2 supports 3 devices: two
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* serial and a parallel port. The parallel port is implemented
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* as a serial-to-parallel converter. That is, the driver actually
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* presents all three USB-2 interfaces as serial ports, but the third
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* one physically connects to a parallel device. Thus, for example,
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* one could plug a parallel printer into the USB-2's third port,
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* but from the kernel's (and userland's) point of view what's
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* actually out there is a serial device.
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*
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* (7/15/2000) borchers
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* -- Fixed race in open when a close is in progress.
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* -- Keep count of opens and dec the module use count for each
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* outstanding open when shutdown is called (on disconnect).
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* -- Fixed sanity checks in read_bulk_callback and write_bulk_callback
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* so pointers are checked before use.
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* -- Split read bulk callback into in band and out of band
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* callbacks, and no longer restart read chains if there is
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* a status error or a sanity error. This fixed the seg
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* faults and other errors we used to get on disconnect.
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* -- Port->active is once again a flag as usb-serial intended it
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* to be, not a count. Since it was only a char it would
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* have been limited to 256 simultaneous opens. Now the open
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* count is kept in the port private structure in dp_open_count.
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* -- Added code for modularization of the digi_acceleport driver.
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*
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* (6/27/2000) pberger and borchers
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* -- Zeroed out sync field in the wakeup_task before first use;
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* otherwise the uninitialized value might prevent the task from
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* being scheduled.
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* -- Initialized ret value to 0 in write_bulk_callback, otherwise
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* the uninitialized value could cause a spurious debugging message.
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*
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* (6/22/2000) pberger and borchers
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* -- Made cond_wait_... inline--apparently on SPARC the flags arg
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* to spin_lock_irqsave cannot be passed to another function
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* to call spin_unlock_irqrestore. Thanks to Pauline Middelink.
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* -- In digi_set_modem_signals the inner nested spin locks use just
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* spin_lock() rather than spin_lock_irqsave(). The old code
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* mistakenly left interrupts off. Thanks to Pauline Middelink.
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* -- copy_from_user (which can sleep) is no longer called while a
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* spinlock is held. We copy to a local buffer before getting
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* the spinlock--don't like the extra copy but the code is simpler.
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* -- Printk and dbg are no longer called while a spin lock is held.
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*
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* (6/4/2000) pberger and borchers
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* -- Replaced separate calls to spin_unlock_irqrestore and
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* interruptible_sleep_on_timeout with a new function
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* cond_wait_interruptible_timeout_irqrestore. This eliminates
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* the race condition where the wake up could happen after
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* the unlock and before the sleep.
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* -- Close now waits for output to drain.
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* -- Open waits until any close in progress is finished.
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* -- All out of band responses are now processed, not just the
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* first in a USB packet.
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* -- Fixed a bug that prevented the driver from working when the
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* first Digi port was not the first USB serial port--the driver
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* was mistakenly using the external USB serial port number to
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* try to index into its internal ports.
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* -- Fixed an SMP bug -- write_bulk_callback is called directly from
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* an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are
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* needed for locks outside write_bulk_callback that are also
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* acquired by write_bulk_callback to prevent deadlocks.
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* -- Fixed support for select() by making digi_chars_in_buffer()
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* return 256 when -EINPROGRESS is set, as the line discipline
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* code in n_tty.c expects.
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* -- Fixed an include file ordering problem that prevented debugging
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* messages from working.
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* -- Fixed an intermittent timeout problem that caused writes to
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* sometimes get stuck on some machines on some kernels. It turns
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* out in these circumstances write_chan() (in n_tty.c) was
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* asleep waiting for our wakeup call. Even though we call
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* wake_up_interruptible() in digi_write_bulk_callback(), there is
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* a race condition that could cause the wakeup to fail: if our
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* wake_up_interruptible() call occurs between the time that our
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* driver write routine finishes and write_chan() sets current->state
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* to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state
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* to TASK_RUNNING will be lost and write_chan's subsequent call to
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* schedule() will never return (unless it catches a signal).
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* This race condition occurs because write_bulk_callback() (and thus
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* the wakeup) are called asynchronously from an interrupt, rather than
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* from the scheduler. We can avoid the race by calling the wakeup
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* from the scheduler queue and that's our fix: Now, at the end of
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* write_bulk_callback() we queue up a wakeup call on the scheduler
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* task queue. We still also invoke the wakeup directly since that
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* squeezes a bit more performance out of the driver, and any lost
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* race conditions will get cleaned up at the next scheduler run.
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*
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* NOTE: The problem also goes away if you comment out
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* the two code lines in write_chan() where current->state
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* is set to TASK_RUNNING just before calling driver.write() and to
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* TASK_INTERRUPTIBLE immediately afterwards. This is why the
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* problem did not show up with the 2.2 kernels -- they do not
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* include that code.
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*
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* (5/16/2000) pberger and borchers
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* -- Added timeouts to sleeps, to defend against lost wake ups.
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* -- Handle transition to/from B0 baud rate in digi_set_termios.
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*
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* (5/13/2000) pberger and borchers
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* -- All commands now sent on out of band port, using
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* digi_write_oob_command.
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* -- Get modem control signals whenever they change, support TIOCMGET/
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* SET/BIS/BIC ioctls.
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* -- digi_set_termios now supports parity, word size, stop bits, and
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* receive enable.
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* -- Cleaned up open and close, use digi_set_termios and
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* digi_write_oob_command to set port parameters.
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* -- Added digi_startup_device to start read chains on all ports.
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* -- Write buffer is only used when count==1, to be sure put_char can
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* write a char (unless the buffer is full).
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*
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* (5/10/2000) pberger and borchers
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* -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close.
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* -- Fixed problem where the first incoming character is lost on
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* port opens after the first close on that port. Now we keep
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* the read_urb chain open until shutdown.
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* -- Added more port conditioning calls in digi_open and digi_close.
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* -- Convert port->active to a use count so that we can deal with multiple
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* opens and closes properly.
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* -- Fixed some problems with the locking code.
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*
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* (5/3/2000) pberger and borchers
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* -- First alpha version of the driver--many known limitations and bugs.
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*
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*
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* Locking and SMP
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*
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* - Each port, including the out-of-band port, has a lock used to
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* serialize all access to the port's private structure.
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* - The port lock is also used to serialize all writes and access to
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* the port's URB.
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* - The port lock is also used for the port write_wait condition
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* variable. Holding the port lock will prevent a wake up on the
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* port's write_wait; this can be used with cond_wait_... to be sure
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* the wake up is not lost in a race when dropping the lock and
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* sleeping waiting for the wakeup.
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* - digi_write() does not sleep, since it is sometimes called on
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* interrupt time.
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* - digi_write_bulk_callback() and digi_read_bulk_callback() are
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* called directly from interrupts. Hence spin_lock_irqsave()
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* and spin_unlock_irqrestore() are used in the rest of the code
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* for any locks they acquire.
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* - digi_write_bulk_callback() gets the port lock before waking up
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* processes sleeping on the port write_wait. It also schedules
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* wake ups so they happen from the scheduler, because the tty
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* system can miss wake ups from interrupts.
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* - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to
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* recheck the condition they are sleeping on. This is defensive,
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* in case a wake up is lost.
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* - Following Documentation/DocBook/kernel-locking.pdf no spin locks
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* are held when calling copy_to/from_user or printk.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/wait.h>
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#include <linux/usb/serial.h>
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/* Defines */
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.80.1.2"
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#define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
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#define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
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/* port output buffer length -- must be <= transfer buffer length - 2 */
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/* so we can be sure to send the full buffer in one urb */
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#define DIGI_OUT_BUF_SIZE 8
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/* port input buffer length -- must be >= transfer buffer length - 3 */
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/* so we can be sure to hold at least one full buffer from one urb */
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#define DIGI_IN_BUF_SIZE 64
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/* retry timeout while sleeping */
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#define DIGI_RETRY_TIMEOUT (HZ/10)
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/* timeout while waiting for tty output to drain in close */
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/* this delay is used twice in close, so the total delay could */
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/* be twice this value */
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#define DIGI_CLOSE_TIMEOUT (5*HZ)
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/* AccelePort USB Defines */
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/* ids */
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#define DIGI_VENDOR_ID 0x05c5
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#define DIGI_2_ID 0x0002 /* USB-2 */
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#define DIGI_4_ID 0x0004 /* USB-4 */
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/* commands
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* "INB": can be used on the in-band endpoint
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* "OOB": can be used on the out-of-band endpoint
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*/
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#define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
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#define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
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#define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
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#define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
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#define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
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#define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
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#define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
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#define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
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#define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
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#define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
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#define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
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#define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
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#define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
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#define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
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#define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
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#define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
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#define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
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#define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
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#define DIGI_CMD_SEND_DATA 18 /* INB */
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#define DIGI_CMD_RECEIVE_DATA 19 /* INB */
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#define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
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#define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
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/* baud rates */
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#define DIGI_BAUD_50 0
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#define DIGI_BAUD_75 1
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#define DIGI_BAUD_110 2
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#define DIGI_BAUD_150 3
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#define DIGI_BAUD_200 4
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#define DIGI_BAUD_300 5
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#define DIGI_BAUD_600 6
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#define DIGI_BAUD_1200 7
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#define DIGI_BAUD_1800 8
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#define DIGI_BAUD_2400 9
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#define DIGI_BAUD_4800 10
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#define DIGI_BAUD_7200 11
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#define DIGI_BAUD_9600 12
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#define DIGI_BAUD_14400 13
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#define DIGI_BAUD_19200 14
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#define DIGI_BAUD_28800 15
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#define DIGI_BAUD_38400 16
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#define DIGI_BAUD_57600 17
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#define DIGI_BAUD_76800 18
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#define DIGI_BAUD_115200 19
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#define DIGI_BAUD_153600 20
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#define DIGI_BAUD_230400 21
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#define DIGI_BAUD_460800 22
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/* arguments */
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#define DIGI_WORD_SIZE_5 0
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#define DIGI_WORD_SIZE_6 1
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#define DIGI_WORD_SIZE_7 2
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#define DIGI_WORD_SIZE_8 3
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#define DIGI_PARITY_NONE 0
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#define DIGI_PARITY_ODD 1
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#define DIGI_PARITY_EVEN 2
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#define DIGI_PARITY_MARK 3
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#define DIGI_PARITY_SPACE 4
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#define DIGI_STOP_BITS_1 0
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#define DIGI_STOP_BITS_2 1
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#define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
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#define DIGI_INPUT_FLOW_CONTROL_RTS 2
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#define DIGI_INPUT_FLOW_CONTROL_DTR 4
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#define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
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#define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
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#define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
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#define DIGI_DTR_INACTIVE 0
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#define DIGI_DTR_ACTIVE 1
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#define DIGI_DTR_INPUT_FLOW_CONTROL 2
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#define DIGI_RTS_INACTIVE 0
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#define DIGI_RTS_ACTIVE 1
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#define DIGI_RTS_INPUT_FLOW_CONTROL 2
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#define DIGI_RTS_TOGGLE 3
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#define DIGI_FLUSH_TX 1
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#define DIGI_FLUSH_RX 2
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#define DIGI_RESUME_TX 4 /* clears xoff condition */
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#define DIGI_TRANSMIT_NOT_IDLE 0
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#define DIGI_TRANSMIT_IDLE 1
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#define DIGI_DISABLE 0
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#define DIGI_ENABLE 1
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#define DIGI_DEASSERT 0
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#define DIGI_ASSERT 1
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/* in band status codes */
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#define DIGI_OVERRUN_ERROR 4
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#define DIGI_PARITY_ERROR 8
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#define DIGI_FRAMING_ERROR 16
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#define DIGI_BREAK_ERROR 32
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/* out of band status */
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#define DIGI_NO_ERROR 0
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#define DIGI_BAD_FIRST_PARAMETER 1
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#define DIGI_BAD_SECOND_PARAMETER 2
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#define DIGI_INVALID_LINE 3
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#define DIGI_INVALID_OPCODE 4
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/* input signals */
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#define DIGI_READ_INPUT_SIGNALS_SLOT 1
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#define DIGI_READ_INPUT_SIGNALS_ERR 2
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#define DIGI_READ_INPUT_SIGNALS_BUSY 4
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#define DIGI_READ_INPUT_SIGNALS_PE 8
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#define DIGI_READ_INPUT_SIGNALS_CTS 16
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#define DIGI_READ_INPUT_SIGNALS_DSR 32
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#define DIGI_READ_INPUT_SIGNALS_RI 64
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#define DIGI_READ_INPUT_SIGNALS_DCD 128
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/* Structures */
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struct digi_serial {
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spinlock_t ds_serial_lock;
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struct usb_serial_port *ds_oob_port; /* out-of-band port */
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int ds_oob_port_num; /* index of out-of-band port */
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int ds_device_started;
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};
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struct digi_port {
|
|
spinlock_t dp_port_lock;
|
|
int dp_port_num;
|
|
int dp_out_buf_len;
|
|
unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
|
|
int dp_write_urb_in_use;
|
|
unsigned int dp_modem_signals;
|
|
wait_queue_head_t dp_modem_change_wait;
|
|
int dp_transmit_idle;
|
|
wait_queue_head_t dp_transmit_idle_wait;
|
|
int dp_throttled;
|
|
int dp_throttle_restart;
|
|
wait_queue_head_t dp_flush_wait;
|
|
wait_queue_head_t dp_close_wait; /* wait queue for close */
|
|
struct work_struct dp_wakeup_work;
|
|
struct usb_serial_port *dp_port;
|
|
};
|
|
|
|
|
|
/* Local Function Declarations */
|
|
|
|
static void digi_wakeup_write(struct usb_serial_port *port);
|
|
static void digi_wakeup_write_lock(struct work_struct *work);
|
|
static int digi_write_oob_command(struct usb_serial_port *port,
|
|
unsigned char *buf, int count, int interruptible);
|
|
static int digi_write_inb_command(struct usb_serial_port *port,
|
|
unsigned char *buf, int count, unsigned long timeout);
|
|
static int digi_set_modem_signals(struct usb_serial_port *port,
|
|
unsigned int modem_signals, int interruptible);
|
|
static int digi_transmit_idle(struct usb_serial_port *port,
|
|
unsigned long timeout);
|
|
static void digi_rx_throttle(struct tty_struct *tty);
|
|
static void digi_rx_unthrottle(struct tty_struct *tty);
|
|
static void digi_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios);
|
|
static void digi_break_ctl(struct tty_struct *tty, int break_state);
|
|
static int digi_tiocmget(struct tty_struct *tty, struct file *file);
|
|
static int digi_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear);
|
|
static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count);
|
|
static void digi_write_bulk_callback(struct urb *urb);
|
|
static int digi_write_room(struct tty_struct *tty);
|
|
static int digi_chars_in_buffer(struct tty_struct *tty);
|
|
static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
|
|
static void digi_close(struct usb_serial_port *port);
|
|
static int digi_carrier_raised(struct usb_serial_port *port);
|
|
static void digi_dtr_rts(struct usb_serial_port *port, int on);
|
|
static int digi_startup_device(struct usb_serial *serial);
|
|
static int digi_startup(struct usb_serial *serial);
|
|
static void digi_disconnect(struct usb_serial *serial);
|
|
static void digi_release(struct usb_serial *serial);
|
|
static void digi_read_bulk_callback(struct urb *urb);
|
|
static int digi_read_inb_callback(struct urb *urb);
|
|
static int digi_read_oob_callback(struct urb *urb);
|
|
|
|
|
|
/* Statics */
|
|
|
|
static int debug;
|
|
|
|
static const struct usb_device_id id_table_combined[] = {
|
|
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
|
|
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
static const struct usb_device_id id_table_2[] = {
|
|
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
static const struct usb_device_id id_table_4[] = {
|
|
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(usb, id_table_combined);
|
|
|
|
static struct usb_driver digi_driver = {
|
|
.name = "digi_acceleport",
|
|
.probe = usb_serial_probe,
|
|
.disconnect = usb_serial_disconnect,
|
|
.id_table = id_table_combined,
|
|
.no_dynamic_id = 1,
|
|
};
|
|
|
|
|
|
/* device info needed for the Digi serial converter */
|
|
|
|
static struct usb_serial_driver digi_acceleport_2_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "digi_2",
|
|
},
|
|
.description = "Digi 2 port USB adapter",
|
|
.usb_driver = &digi_driver,
|
|
.id_table = id_table_2,
|
|
.num_ports = 3,
|
|
.open = digi_open,
|
|
.close = digi_close,
|
|
.dtr_rts = digi_dtr_rts,
|
|
.carrier_raised = digi_carrier_raised,
|
|
.write = digi_write,
|
|
.write_room = digi_write_room,
|
|
.write_bulk_callback = digi_write_bulk_callback,
|
|
.read_bulk_callback = digi_read_bulk_callback,
|
|
.chars_in_buffer = digi_chars_in_buffer,
|
|
.throttle = digi_rx_throttle,
|
|
.unthrottle = digi_rx_unthrottle,
|
|
.set_termios = digi_set_termios,
|
|
.break_ctl = digi_break_ctl,
|
|
.tiocmget = digi_tiocmget,
|
|
.tiocmset = digi_tiocmset,
|
|
.attach = digi_startup,
|
|
.disconnect = digi_disconnect,
|
|
.release = digi_release,
|
|
};
|
|
|
|
static struct usb_serial_driver digi_acceleport_4_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "digi_4",
|
|
},
|
|
.description = "Digi 4 port USB adapter",
|
|
.usb_driver = &digi_driver,
|
|
.id_table = id_table_4,
|
|
.num_ports = 4,
|
|
.open = digi_open,
|
|
.close = digi_close,
|
|
.write = digi_write,
|
|
.write_room = digi_write_room,
|
|
.write_bulk_callback = digi_write_bulk_callback,
|
|
.read_bulk_callback = digi_read_bulk_callback,
|
|
.chars_in_buffer = digi_chars_in_buffer,
|
|
.throttle = digi_rx_throttle,
|
|
.unthrottle = digi_rx_unthrottle,
|
|
.set_termios = digi_set_termios,
|
|
.break_ctl = digi_break_ctl,
|
|
.tiocmget = digi_tiocmget,
|
|
.tiocmset = digi_tiocmset,
|
|
.attach = digi_startup,
|
|
.disconnect = digi_disconnect,
|
|
.release = digi_release,
|
|
};
|
|
|
|
|
|
/* Functions */
|
|
|
|
/*
|
|
* Cond Wait Interruptible Timeout Irqrestore
|
|
*
|
|
* Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
|
|
* so that wake ups are not lost if they occur between the unlock
|
|
* and the sleep. In other words, spin_unlock_irqrestore and
|
|
* interruptible_sleep_on_timeout are "atomic" with respect to
|
|
* wake ups. This is used to implement condition variables.
|
|
*
|
|
* interruptible_sleep_on_timeout is deprecated and has been replaced
|
|
* with the equivalent code.
|
|
*/
|
|
|
|
static long cond_wait_interruptible_timeout_irqrestore(
|
|
wait_queue_head_t *q, long timeout,
|
|
spinlock_t *lock, unsigned long flags)
|
|
__releases(lock)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
|
|
spin_unlock_irqrestore(lock, flags);
|
|
timeout = schedule_timeout(timeout);
|
|
finish_wait(q, &wait);
|
|
|
|
return timeout;
|
|
}
|
|
|
|
|
|
/*
|
|
* Digi Wakeup Write
|
|
*
|
|
* Wake up port, line discipline, and tty processes sleeping
|
|
* on writes.
|
|
*/
|
|
|
|
static void digi_wakeup_write_lock(struct work_struct *work)
|
|
{
|
|
struct digi_port *priv =
|
|
container_of(work, struct digi_port, dp_wakeup_work);
|
|
struct usb_serial_port *port = priv->dp_port;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
digi_wakeup_write(port);
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
}
|
|
|
|
static void digi_wakeup_write(struct usb_serial_port *port)
|
|
{
|
|
struct tty_struct *tty = tty_port_tty_get(&port->port);
|
|
if (tty) {
|
|
tty_wakeup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Digi Write OOB Command
|
|
*
|
|
* Write commands on the out of band port. Commands are 4
|
|
* bytes each, multiple commands can be sent at once, and
|
|
* no command will be split across USB packets. Returns 0
|
|
* if successful, -EINTR if interrupted while sleeping and
|
|
* the interruptible flag is true, or a negative error
|
|
* returned by usb_submit_urb.
|
|
*/
|
|
|
|
static int digi_write_oob_command(struct usb_serial_port *port,
|
|
unsigned char *buf, int count, int interruptible)
|
|
{
|
|
|
|
int ret = 0;
|
|
int len;
|
|
struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
|
|
struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
|
|
unsigned long flags = 0;
|
|
|
|
dbg("digi_write_oob_command: TOP: port=%d, count=%d", oob_priv->dp_port_num, count);
|
|
|
|
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
|
|
while (count > 0) {
|
|
while (oob_priv->dp_write_urb_in_use) {
|
|
cond_wait_interruptible_timeout_irqrestore(
|
|
&oob_port->write_wait, DIGI_RETRY_TIMEOUT,
|
|
&oob_priv->dp_port_lock, flags);
|
|
if (interruptible && signal_pending(current))
|
|
return -EINTR;
|
|
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
|
|
}
|
|
|
|
/* len must be a multiple of 4, so commands are not split */
|
|
len = min(count, oob_port->bulk_out_size);
|
|
if (len > 4)
|
|
len &= ~3;
|
|
memcpy(oob_port->write_urb->transfer_buffer, buf, len);
|
|
oob_port->write_urb->transfer_buffer_length = len;
|
|
oob_port->write_urb->dev = port->serial->dev;
|
|
ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
|
|
if (ret == 0) {
|
|
oob_priv->dp_write_urb_in_use = 1;
|
|
count -= len;
|
|
buf += len;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
|
|
if (ret)
|
|
dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
|
|
__func__, ret);
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* Digi Write In Band Command
|
|
*
|
|
* Write commands on the given port. Commands are 4
|
|
* bytes each, multiple commands can be sent at once, and
|
|
* no command will be split across USB packets. If timeout
|
|
* is non-zero, write in band command will return after
|
|
* waiting unsuccessfully for the URB status to clear for
|
|
* timeout ticks. Returns 0 if successful, or a negative
|
|
* error returned by digi_write.
|
|
*/
|
|
|
|
static int digi_write_inb_command(struct usb_serial_port *port,
|
|
unsigned char *buf, int count, unsigned long timeout)
|
|
{
|
|
int ret = 0;
|
|
int len;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
unsigned char *data = port->write_urb->transfer_buffer;
|
|
unsigned long flags = 0;
|
|
|
|
dbg("digi_write_inb_command: TOP: port=%d, count=%d",
|
|
priv->dp_port_num, count);
|
|
|
|
if (timeout)
|
|
timeout += jiffies;
|
|
else
|
|
timeout = ULONG_MAX;
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
while (count > 0 && ret == 0) {
|
|
while (priv->dp_write_urb_in_use &&
|
|
time_before(jiffies, timeout)) {
|
|
cond_wait_interruptible_timeout_irqrestore(
|
|
&port->write_wait, DIGI_RETRY_TIMEOUT,
|
|
&priv->dp_port_lock, flags);
|
|
if (signal_pending(current))
|
|
return -EINTR;
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
}
|
|
|
|
/* len must be a multiple of 4 and small enough to */
|
|
/* guarantee the write will send buffered data first, */
|
|
/* so commands are in order with data and not split */
|
|
len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
|
|
if (len > 4)
|
|
len &= ~3;
|
|
|
|
/* write any buffered data first */
|
|
if (priv->dp_out_buf_len > 0) {
|
|
data[0] = DIGI_CMD_SEND_DATA;
|
|
data[1] = priv->dp_out_buf_len;
|
|
memcpy(data + 2, priv->dp_out_buf,
|
|
priv->dp_out_buf_len);
|
|
memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
|
|
port->write_urb->transfer_buffer_length
|
|
= priv->dp_out_buf_len + 2 + len;
|
|
} else {
|
|
memcpy(data, buf, len);
|
|
port->write_urb->transfer_buffer_length = len;
|
|
}
|
|
port->write_urb->dev = port->serial->dev;
|
|
|
|
ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
|
|
if (ret == 0) {
|
|
priv->dp_write_urb_in_use = 1;
|
|
priv->dp_out_buf_len = 0;
|
|
count -= len;
|
|
buf += len;
|
|
}
|
|
|
|
}
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
|
|
if (ret)
|
|
dev_err(&port->dev,
|
|
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
|
|
__func__, ret, priv->dp_port_num);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Digi Set Modem Signals
|
|
*
|
|
* Sets or clears DTR and RTS on the port, according to the
|
|
* modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
|
|
* for the modem_signals argument. Returns 0 if successful,
|
|
* -EINTR if interrupted while sleeping, or a non-zero error
|
|
* returned by usb_submit_urb.
|
|
*/
|
|
|
|
static int digi_set_modem_signals(struct usb_serial_port *port,
|
|
unsigned int modem_signals, int interruptible)
|
|
{
|
|
|
|
int ret;
|
|
struct digi_port *port_priv = usb_get_serial_port_data(port);
|
|
struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
|
|
struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
|
|
unsigned char *data = oob_port->write_urb->transfer_buffer;
|
|
unsigned long flags = 0;
|
|
|
|
|
|
dbg("digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x",
|
|
port_priv->dp_port_num, modem_signals);
|
|
|
|
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
|
|
spin_lock(&port_priv->dp_port_lock);
|
|
|
|
while (oob_priv->dp_write_urb_in_use) {
|
|
spin_unlock(&port_priv->dp_port_lock);
|
|
cond_wait_interruptible_timeout_irqrestore(
|
|
&oob_port->write_wait, DIGI_RETRY_TIMEOUT,
|
|
&oob_priv->dp_port_lock, flags);
|
|
if (interruptible && signal_pending(current))
|
|
return -EINTR;
|
|
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
|
|
spin_lock(&port_priv->dp_port_lock);
|
|
}
|
|
data[0] = DIGI_CMD_SET_DTR_SIGNAL;
|
|
data[1] = port_priv->dp_port_num;
|
|
data[2] = (modem_signals & TIOCM_DTR) ?
|
|
DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
|
|
data[3] = 0;
|
|
data[4] = DIGI_CMD_SET_RTS_SIGNAL;
|
|
data[5] = port_priv->dp_port_num;
|
|
data[6] = (modem_signals & TIOCM_RTS) ?
|
|
DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
|
|
data[7] = 0;
|
|
|
|
oob_port->write_urb->transfer_buffer_length = 8;
|
|
oob_port->write_urb->dev = port->serial->dev;
|
|
|
|
ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
|
|
if (ret == 0) {
|
|
oob_priv->dp_write_urb_in_use = 1;
|
|
port_priv->dp_modem_signals =
|
|
(port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
|
|
| (modem_signals&(TIOCM_DTR|TIOCM_RTS));
|
|
}
|
|
spin_unlock(&port_priv->dp_port_lock);
|
|
spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
|
|
if (ret)
|
|
dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
|
|
__func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Digi Transmit Idle
|
|
*
|
|
* Digi transmit idle waits, up to timeout ticks, for the transmitter
|
|
* to go idle. It returns 0 if successful or a negative error.
|
|
*
|
|
* There are race conditions here if more than one process is calling
|
|
* digi_transmit_idle on the same port at the same time. However, this
|
|
* is only called from close, and only one process can be in close on a
|
|
* port at a time, so its ok.
|
|
*/
|
|
|
|
static int digi_transmit_idle(struct usb_serial_port *port,
|
|
unsigned long timeout)
|
|
{
|
|
int ret;
|
|
unsigned char buf[2];
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags = 0;
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
priv->dp_transmit_idle = 0;
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
|
|
buf[0] = DIGI_CMD_TRANSMIT_IDLE;
|
|
buf[1] = 0;
|
|
|
|
timeout += jiffies;
|
|
|
|
ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
|
|
while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
|
|
cond_wait_interruptible_timeout_irqrestore(
|
|
&priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
|
|
&priv->dp_port_lock, flags);
|
|
if (signal_pending(current))
|
|
return -EINTR;
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
}
|
|
priv->dp_transmit_idle = 0;
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
static void digi_rx_throttle(struct tty_struct *tty)
|
|
{
|
|
unsigned long flags;
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
|
|
|
|
dbg("digi_rx_throttle: TOP: port=%d", priv->dp_port_num);
|
|
|
|
/* stop receiving characters by not resubmitting the read urb */
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
priv->dp_throttled = 1;
|
|
priv->dp_throttle_restart = 0;
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
}
|
|
|
|
|
|
static void digi_rx_unthrottle(struct tty_struct *tty)
|
|
{
|
|
int ret = 0;
|
|
unsigned long flags;
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
|
|
dbg("digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num);
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
|
|
/* restart read chain */
|
|
if (priv->dp_throttle_restart) {
|
|
port->read_urb->dev = port->serial->dev;
|
|
ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
|
|
}
|
|
|
|
/* turn throttle off */
|
|
priv->dp_throttled = 0;
|
|
priv->dp_throttle_restart = 0;
|
|
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
|
|
if (ret)
|
|
dev_err(&port->dev,
|
|
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
|
|
__func__, ret, priv->dp_port_num);
|
|
}
|
|
|
|
|
|
static void digi_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios)
|
|
{
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
unsigned int iflag = tty->termios->c_iflag;
|
|
unsigned int cflag = tty->termios->c_cflag;
|
|
unsigned int old_iflag = old_termios->c_iflag;
|
|
unsigned int old_cflag = old_termios->c_cflag;
|
|
unsigned char buf[32];
|
|
unsigned int modem_signals;
|
|
int arg, ret;
|
|
int i = 0;
|
|
speed_t baud;
|
|
|
|
dbg("digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x", priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
|
|
|
|
/* set baud rate */
|
|
baud = tty_get_baud_rate(tty);
|
|
if (baud != tty_termios_baud_rate(old_termios)) {
|
|
arg = -1;
|
|
|
|
/* reassert DTR and (maybe) RTS on transition from B0 */
|
|
if ((old_cflag&CBAUD) == B0) {
|
|
/* don't set RTS if using hardware flow control */
|
|
/* and throttling input */
|
|
modem_signals = TIOCM_DTR;
|
|
if (!(tty->termios->c_cflag & CRTSCTS) ||
|
|
!test_bit(TTY_THROTTLED, &tty->flags))
|
|
modem_signals |= TIOCM_RTS;
|
|
digi_set_modem_signals(port, modem_signals, 1);
|
|
}
|
|
switch (baud) {
|
|
/* drop DTR and RTS on transition to B0 */
|
|
case 0: digi_set_modem_signals(port, 0, 1); break;
|
|
case 50: arg = DIGI_BAUD_50; break;
|
|
case 75: arg = DIGI_BAUD_75; break;
|
|
case 110: arg = DIGI_BAUD_110; break;
|
|
case 150: arg = DIGI_BAUD_150; break;
|
|
case 200: arg = DIGI_BAUD_200; break;
|
|
case 300: arg = DIGI_BAUD_300; break;
|
|
case 600: arg = DIGI_BAUD_600; break;
|
|
case 1200: arg = DIGI_BAUD_1200; break;
|
|
case 1800: arg = DIGI_BAUD_1800; break;
|
|
case 2400: arg = DIGI_BAUD_2400; break;
|
|
case 4800: arg = DIGI_BAUD_4800; break;
|
|
case 9600: arg = DIGI_BAUD_9600; break;
|
|
case 19200: arg = DIGI_BAUD_19200; break;
|
|
case 38400: arg = DIGI_BAUD_38400; break;
|
|
case 57600: arg = DIGI_BAUD_57600; break;
|
|
case 115200: arg = DIGI_BAUD_115200; break;
|
|
case 230400: arg = DIGI_BAUD_230400; break;
|
|
case 460800: arg = DIGI_BAUD_460800; break;
|
|
default:
|
|
arg = DIGI_BAUD_9600;
|
|
baud = 9600;
|
|
break;
|
|
}
|
|
if (arg != -1) {
|
|
buf[i++] = DIGI_CMD_SET_BAUD_RATE;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = arg;
|
|
buf[i++] = 0;
|
|
}
|
|
}
|
|
/* set parity */
|
|
tty->termios->c_cflag &= ~CMSPAR;
|
|
|
|
if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
|
|
if (cflag&PARENB) {
|
|
if (cflag&PARODD)
|
|
arg = DIGI_PARITY_ODD;
|
|
else
|
|
arg = DIGI_PARITY_EVEN;
|
|
} else {
|
|
arg = DIGI_PARITY_NONE;
|
|
}
|
|
buf[i++] = DIGI_CMD_SET_PARITY;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = arg;
|
|
buf[i++] = 0;
|
|
}
|
|
/* set word size */
|
|
if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
|
|
arg = -1;
|
|
switch (cflag&CSIZE) {
|
|
case CS5: arg = DIGI_WORD_SIZE_5; break;
|
|
case CS6: arg = DIGI_WORD_SIZE_6; break;
|
|
case CS7: arg = DIGI_WORD_SIZE_7; break;
|
|
case CS8: arg = DIGI_WORD_SIZE_8; break;
|
|
default:
|
|
dbg("digi_set_termios: can't handle word size %d",
|
|
(cflag&CSIZE));
|
|
break;
|
|
}
|
|
|
|
if (arg != -1) {
|
|
buf[i++] = DIGI_CMD_SET_WORD_SIZE;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = arg;
|
|
buf[i++] = 0;
|
|
}
|
|
|
|
}
|
|
|
|
/* set stop bits */
|
|
if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
|
|
|
|
if ((cflag&CSTOPB))
|
|
arg = DIGI_STOP_BITS_2;
|
|
else
|
|
arg = DIGI_STOP_BITS_1;
|
|
|
|
buf[i++] = DIGI_CMD_SET_STOP_BITS;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = arg;
|
|
buf[i++] = 0;
|
|
|
|
}
|
|
|
|
/* set input flow control */
|
|
if ((iflag&IXOFF) != (old_iflag&IXOFF)
|
|
|| (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
|
|
arg = 0;
|
|
if (iflag&IXOFF)
|
|
arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
|
|
else
|
|
arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
|
|
|
|
if (cflag&CRTSCTS) {
|
|
arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
|
|
|
|
/* On USB-4 it is necessary to assert RTS prior */
|
|
/* to selecting RTS input flow control. */
|
|
buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = DIGI_RTS_ACTIVE;
|
|
buf[i++] = 0;
|
|
|
|
} else {
|
|
arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
|
|
}
|
|
buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = arg;
|
|
buf[i++] = 0;
|
|
}
|
|
|
|
/* set output flow control */
|
|
if ((iflag & IXON) != (old_iflag & IXON)
|
|
|| (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
|
|
arg = 0;
|
|
if (iflag & IXON)
|
|
arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
|
|
else
|
|
arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
|
|
|
|
if (cflag & CRTSCTS) {
|
|
arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
|
|
} else {
|
|
arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
|
|
tty->hw_stopped = 0;
|
|
}
|
|
|
|
buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = arg;
|
|
buf[i++] = 0;
|
|
}
|
|
|
|
/* set receive enable/disable */
|
|
if ((cflag & CREAD) != (old_cflag & CREAD)) {
|
|
if (cflag & CREAD)
|
|
arg = DIGI_ENABLE;
|
|
else
|
|
arg = DIGI_DISABLE;
|
|
|
|
buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
|
|
buf[i++] = priv->dp_port_num;
|
|
buf[i++] = arg;
|
|
buf[i++] = 0;
|
|
}
|
|
ret = digi_write_oob_command(port, buf, i, 1);
|
|
if (ret != 0)
|
|
dbg("digi_set_termios: write oob failed, ret=%d", ret);
|
|
tty_encode_baud_rate(tty, baud, baud);
|
|
}
|
|
|
|
|
|
static void digi_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
unsigned char buf[4];
|
|
|
|
buf[0] = DIGI_CMD_BREAK_CONTROL;
|
|
buf[1] = 2; /* length */
|
|
buf[2] = break_state ? 1 : 0;
|
|
buf[3] = 0; /* pad */
|
|
digi_write_inb_command(port, buf, 4, 0);
|
|
}
|
|
|
|
|
|
static int digi_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
unsigned int val;
|
|
unsigned long flags;
|
|
|
|
dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
val = priv->dp_modem_signals;
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
return val;
|
|
}
|
|
|
|
|
|
static int digi_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
unsigned int val;
|
|
unsigned long flags;
|
|
|
|
dbg("%s: TOP: port=%d", __func__, priv->dp_port_num);
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
val = (priv->dp_modem_signals & ~clear) | set;
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
return digi_set_modem_signals(port, val, 1);
|
|
}
|
|
|
|
|
|
static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
|
|
int ret, data_len, new_len;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
unsigned char *data = port->write_urb->transfer_buffer;
|
|
unsigned long flags = 0;
|
|
|
|
dbg("digi_write: TOP: port=%d, count=%d, in_interrupt=%ld",
|
|
priv->dp_port_num, count, in_interrupt());
|
|
|
|
/* copy user data (which can sleep) before getting spin lock */
|
|
count = min(count, port->bulk_out_size-2);
|
|
count = min(64, count);
|
|
|
|
/* be sure only one write proceeds at a time */
|
|
/* there are races on the port private buffer */
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
|
|
/* wait for urb status clear to submit another urb */
|
|
if (priv->dp_write_urb_in_use) {
|
|
/* buffer data if count is 1 (probably put_char) if possible */
|
|
if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
|
|
priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
|
|
new_len = 1;
|
|
} else {
|
|
new_len = 0;
|
|
}
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
return new_len;
|
|
}
|
|
|
|
/* allow space for any buffered data and for new data, up to */
|
|
/* transfer buffer size - 2 (for command and length bytes) */
|
|
new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
|
|
data_len = new_len + priv->dp_out_buf_len;
|
|
|
|
if (data_len == 0) {
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
port->write_urb->transfer_buffer_length = data_len+2;
|
|
port->write_urb->dev = port->serial->dev;
|
|
|
|
*data++ = DIGI_CMD_SEND_DATA;
|
|
*data++ = data_len;
|
|
|
|
/* copy in buffered data first */
|
|
memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
|
|
data += priv->dp_out_buf_len;
|
|
|
|
/* copy in new data */
|
|
memcpy(data, buf, new_len);
|
|
|
|
ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
|
|
if (ret == 0) {
|
|
priv->dp_write_urb_in_use = 1;
|
|
ret = new_len;
|
|
priv->dp_out_buf_len = 0;
|
|
}
|
|
|
|
/* return length of new data written, or error */
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
if (ret < 0)
|
|
dev_err(&port->dev,
|
|
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
|
|
__func__, ret, priv->dp_port_num);
|
|
dbg("digi_write: returning %d", ret);
|
|
return ret;
|
|
|
|
}
|
|
|
|
static void digi_write_bulk_callback(struct urb *urb)
|
|
{
|
|
|
|
struct usb_serial_port *port = urb->context;
|
|
struct usb_serial *serial;
|
|
struct digi_port *priv;
|
|
struct digi_serial *serial_priv;
|
|
int ret = 0;
|
|
int status = urb->status;
|
|
|
|
dbg("digi_write_bulk_callback: TOP, status=%d", status);
|
|
|
|
/* port and serial sanity check */
|
|
if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
|
|
pr_err("%s: port or port->private is NULL, status=%d\n",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
serial = port->serial;
|
|
if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
|
|
dev_err(&port->dev,
|
|
"%s: serial or serial->private is NULL, status=%d\n",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
|
|
/* handle oob callback */
|
|
if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
|
|
dbg("digi_write_bulk_callback: oob callback");
|
|
spin_lock(&priv->dp_port_lock);
|
|
priv->dp_write_urb_in_use = 0;
|
|
wake_up_interruptible(&port->write_wait);
|
|
spin_unlock(&priv->dp_port_lock);
|
|
return;
|
|
}
|
|
|
|
/* try to send any buffered data on this port */
|
|
spin_lock(&priv->dp_port_lock);
|
|
priv->dp_write_urb_in_use = 0;
|
|
if (priv->dp_out_buf_len > 0) {
|
|
*((unsigned char *)(port->write_urb->transfer_buffer))
|
|
= (unsigned char)DIGI_CMD_SEND_DATA;
|
|
*((unsigned char *)(port->write_urb->transfer_buffer) + 1)
|
|
= (unsigned char)priv->dp_out_buf_len;
|
|
port->write_urb->transfer_buffer_length =
|
|
priv->dp_out_buf_len + 2;
|
|
port->write_urb->dev = serial->dev;
|
|
memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
|
|
priv->dp_out_buf_len);
|
|
ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
|
|
if (ret == 0) {
|
|
priv->dp_write_urb_in_use = 1;
|
|
priv->dp_out_buf_len = 0;
|
|
}
|
|
}
|
|
/* wake up processes sleeping on writes immediately */
|
|
digi_wakeup_write(port);
|
|
/* also queue up a wakeup at scheduler time, in case we */
|
|
/* lost the race in write_chan(). */
|
|
schedule_work(&priv->dp_wakeup_work);
|
|
|
|
spin_unlock(&priv->dp_port_lock);
|
|
if (ret && ret != -EPERM)
|
|
dev_err(&port->dev,
|
|
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
|
|
__func__, ret, priv->dp_port_num);
|
|
}
|
|
|
|
static int digi_write_room(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
int room;
|
|
unsigned long flags = 0;
|
|
|
|
spin_lock_irqsave(&priv->dp_port_lock, flags);
|
|
|
|
if (priv->dp_write_urb_in_use)
|
|
room = 0;
|
|
else
|
|
room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
|
|
|
|
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
|
|
dbg("digi_write_room: port=%d, room=%d", priv->dp_port_num, room);
|
|
return room;
|
|
|
|
}
|
|
|
|
static int digi_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
|
|
if (priv->dp_write_urb_in_use) {
|
|
dbg("digi_chars_in_buffer: port=%d, chars=%d",
|
|
priv->dp_port_num, port->bulk_out_size - 2);
|
|
/* return(port->bulk_out_size - 2); */
|
|
return 256;
|
|
} else {
|
|
dbg("digi_chars_in_buffer: port=%d, chars=%d",
|
|
priv->dp_port_num, priv->dp_out_buf_len);
|
|
return priv->dp_out_buf_len;
|
|
}
|
|
|
|
}
|
|
|
|
static void digi_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
/* Adjust DTR and RTS */
|
|
digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
|
|
}
|
|
|
|
static int digi_carrier_raised(struct usb_serial_port *port)
|
|
{
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
if (priv->dp_modem_signals & TIOCM_CD)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
int ret;
|
|
unsigned char buf[32];
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
struct ktermios not_termios;
|
|
|
|
dbg("digi_open: TOP: port=%d", priv->dp_port_num);
|
|
|
|
/* be sure the device is started up */
|
|
if (digi_startup_device(port->serial) != 0)
|
|
return -ENXIO;
|
|
|
|
/* read modem signals automatically whenever they change */
|
|
buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
|
|
buf[1] = priv->dp_port_num;
|
|
buf[2] = DIGI_ENABLE;
|
|
buf[3] = 0;
|
|
|
|
/* flush fifos */
|
|
buf[4] = DIGI_CMD_IFLUSH_FIFO;
|
|
buf[5] = priv->dp_port_num;
|
|
buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
|
|
buf[7] = 0;
|
|
|
|
ret = digi_write_oob_command(port, buf, 8, 1);
|
|
if (ret != 0)
|
|
dbg("digi_open: write oob failed, ret=%d", ret);
|
|
|
|
/* set termios settings */
|
|
if (tty) {
|
|
not_termios.c_cflag = ~tty->termios->c_cflag;
|
|
not_termios.c_iflag = ~tty->termios->c_iflag;
|
|
digi_set_termios(tty, port, ¬_termios);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void digi_close(struct usb_serial_port *port)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
int ret;
|
|
unsigned char buf[32];
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
|
|
dbg("digi_close: TOP: port=%d", priv->dp_port_num);
|
|
|
|
mutex_lock(&port->serial->disc_mutex);
|
|
/* if disconnected, just clear flags */
|
|
if (port->serial->disconnected)
|
|
goto exit;
|
|
|
|
if (port->serial->dev) {
|
|
/* FIXME: Transmit idle belongs in the wait_unti_sent path */
|
|
digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
|
|
|
|
/* disable input flow control */
|
|
buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
|
|
buf[1] = priv->dp_port_num;
|
|
buf[2] = DIGI_DISABLE;
|
|
buf[3] = 0;
|
|
|
|
/* disable output flow control */
|
|
buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
|
|
buf[5] = priv->dp_port_num;
|
|
buf[6] = DIGI_DISABLE;
|
|
buf[7] = 0;
|
|
|
|
/* disable reading modem signals automatically */
|
|
buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
|
|
buf[9] = priv->dp_port_num;
|
|
buf[10] = DIGI_DISABLE;
|
|
buf[11] = 0;
|
|
|
|
/* disable receive */
|
|
buf[12] = DIGI_CMD_RECEIVE_ENABLE;
|
|
buf[13] = priv->dp_port_num;
|
|
buf[14] = DIGI_DISABLE;
|
|
buf[15] = 0;
|
|
|
|
/* flush fifos */
|
|
buf[16] = DIGI_CMD_IFLUSH_FIFO;
|
|
buf[17] = priv->dp_port_num;
|
|
buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
|
|
buf[19] = 0;
|
|
|
|
ret = digi_write_oob_command(port, buf, 20, 0);
|
|
if (ret != 0)
|
|
dbg("digi_close: write oob failed, ret=%d", ret);
|
|
|
|
/* wait for final commands on oob port to complete */
|
|
prepare_to_wait(&priv->dp_flush_wait, &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
schedule_timeout(DIGI_CLOSE_TIMEOUT);
|
|
finish_wait(&priv->dp_flush_wait, &wait);
|
|
|
|
/* shutdown any outstanding bulk writes */
|
|
usb_kill_urb(port->write_urb);
|
|
}
|
|
exit:
|
|
spin_lock_irq(&priv->dp_port_lock);
|
|
priv->dp_write_urb_in_use = 0;
|
|
wake_up_interruptible(&priv->dp_close_wait);
|
|
spin_unlock_irq(&priv->dp_port_lock);
|
|
mutex_unlock(&port->serial->disc_mutex);
|
|
dbg("digi_close: done");
|
|
}
|
|
|
|
|
|
/*
|
|
* Digi Startup Device
|
|
*
|
|
* Starts reads on all ports. Must be called AFTER startup, with
|
|
* urbs initialized. Returns 0 if successful, non-zero error otherwise.
|
|
*/
|
|
|
|
static int digi_startup_device(struct usb_serial *serial)
|
|
{
|
|
int i, ret = 0;
|
|
struct digi_serial *serial_priv = usb_get_serial_data(serial);
|
|
struct usb_serial_port *port;
|
|
|
|
/* be sure this happens exactly once */
|
|
spin_lock(&serial_priv->ds_serial_lock);
|
|
if (serial_priv->ds_device_started) {
|
|
spin_unlock(&serial_priv->ds_serial_lock);
|
|
return 0;
|
|
}
|
|
serial_priv->ds_device_started = 1;
|
|
spin_unlock(&serial_priv->ds_serial_lock);
|
|
|
|
/* start reading from each bulk in endpoint for the device */
|
|
/* set USB_DISABLE_SPD flag for write bulk urbs */
|
|
for (i = 0; i < serial->type->num_ports + 1; i++) {
|
|
port = serial->port[i];
|
|
port->write_urb->dev = port->serial->dev;
|
|
ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
|
|
if (ret != 0) {
|
|
dev_err(&port->dev,
|
|
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
|
|
__func__, ret, i);
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int digi_startup(struct usb_serial *serial)
|
|
{
|
|
|
|
int i;
|
|
struct digi_port *priv;
|
|
struct digi_serial *serial_priv;
|
|
|
|
dbg("digi_startup: TOP");
|
|
|
|
/* allocate the private data structures for all ports */
|
|
/* number of regular ports + 1 for the out-of-band port */
|
|
for (i = 0; i < serial->type->num_ports + 1; i++) {
|
|
/* allocate port private structure */
|
|
priv = kmalloc(sizeof(struct digi_port), GFP_KERNEL);
|
|
if (priv == NULL) {
|
|
while (--i >= 0)
|
|
kfree(usb_get_serial_port_data(serial->port[i]));
|
|
return 1; /* error */
|
|
}
|
|
|
|
/* initialize port private structure */
|
|
spin_lock_init(&priv->dp_port_lock);
|
|
priv->dp_port_num = i;
|
|
priv->dp_out_buf_len = 0;
|
|
priv->dp_write_urb_in_use = 0;
|
|
priv->dp_modem_signals = 0;
|
|
init_waitqueue_head(&priv->dp_modem_change_wait);
|
|
priv->dp_transmit_idle = 0;
|
|
init_waitqueue_head(&priv->dp_transmit_idle_wait);
|
|
priv->dp_throttled = 0;
|
|
priv->dp_throttle_restart = 0;
|
|
init_waitqueue_head(&priv->dp_flush_wait);
|
|
init_waitqueue_head(&priv->dp_close_wait);
|
|
INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
|
|
priv->dp_port = serial->port[i];
|
|
/* initialize write wait queue for this port */
|
|
init_waitqueue_head(&serial->port[i]->write_wait);
|
|
|
|
usb_set_serial_port_data(serial->port[i], priv);
|
|
}
|
|
|
|
/* allocate serial private structure */
|
|
serial_priv = kmalloc(sizeof(struct digi_serial), GFP_KERNEL);
|
|
if (serial_priv == NULL) {
|
|
for (i = 0; i < serial->type->num_ports + 1; i++)
|
|
kfree(usb_get_serial_port_data(serial->port[i]));
|
|
return 1; /* error */
|
|
}
|
|
|
|
/* initialize serial private structure */
|
|
spin_lock_init(&serial_priv->ds_serial_lock);
|
|
serial_priv->ds_oob_port_num = serial->type->num_ports;
|
|
serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num];
|
|
serial_priv->ds_device_started = 0;
|
|
usb_set_serial_data(serial, serial_priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void digi_disconnect(struct usb_serial *serial)
|
|
{
|
|
int i;
|
|
dbg("digi_disconnect: TOP, in_interrupt()=%ld", in_interrupt());
|
|
|
|
/* stop reads and writes on all ports */
|
|
for (i = 0; i < serial->type->num_ports + 1; i++) {
|
|
usb_kill_urb(serial->port[i]->read_urb);
|
|
usb_kill_urb(serial->port[i]->write_urb);
|
|
}
|
|
}
|
|
|
|
|
|
static void digi_release(struct usb_serial *serial)
|
|
{
|
|
int i;
|
|
dbg("digi_release: TOP, in_interrupt()=%ld", in_interrupt());
|
|
|
|
/* free the private data structures for all ports */
|
|
/* number of regular ports + 1 for the out-of-band port */
|
|
for (i = 0; i < serial->type->num_ports + 1; i++)
|
|
kfree(usb_get_serial_port_data(serial->port[i]));
|
|
kfree(usb_get_serial_data(serial));
|
|
}
|
|
|
|
|
|
static void digi_read_bulk_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
struct digi_port *priv;
|
|
struct digi_serial *serial_priv;
|
|
int ret;
|
|
int status = urb->status;
|
|
|
|
dbg("digi_read_bulk_callback: TOP");
|
|
|
|
/* port sanity check, do not resubmit if port is not valid */
|
|
if (port == NULL)
|
|
return;
|
|
priv = usb_get_serial_port_data(port);
|
|
if (priv == NULL) {
|
|
dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
|
|
__func__, status);
|
|
return;
|
|
}
|
|
if (port->serial == NULL ||
|
|
(serial_priv = usb_get_serial_data(port->serial)) == NULL) {
|
|
dev_err(&port->dev, "%s: serial is bad or serial->private "
|
|
"is NULL, status=%d\n", __func__, status);
|
|
return;
|
|
}
|
|
|
|
/* do not resubmit urb if it has any status error */
|
|
if (status) {
|
|
dev_err(&port->dev,
|
|
"%s: nonzero read bulk status: status=%d, port=%d\n",
|
|
__func__, status, priv->dp_port_num);
|
|
return;
|
|
}
|
|
|
|
/* handle oob or inb callback, do not resubmit if error */
|
|
if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
|
|
if (digi_read_oob_callback(urb) != 0)
|
|
return;
|
|
} else {
|
|
if (digi_read_inb_callback(urb) != 0)
|
|
return;
|
|
}
|
|
|
|
/* continue read */
|
|
urb->dev = port->serial->dev;
|
|
ret = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (ret != 0 && ret != -EPERM) {
|
|
dev_err(&port->dev,
|
|
"%s: failed resubmitting urb, ret=%d, port=%d\n",
|
|
__func__, ret, priv->dp_port_num);
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Digi Read INB Callback
|
|
*
|
|
* Digi Read INB Callback handles reads on the in band ports, sending
|
|
* the data on to the tty subsystem. When called we know port and
|
|
* port->private are not NULL and port->serial has been validated.
|
|
* It returns 0 if successful, 1 if successful but the port is
|
|
* throttled, and -1 if the sanity checks failed.
|
|
*/
|
|
|
|
static int digi_read_inb_callback(struct urb *urb)
|
|
{
|
|
|
|
struct usb_serial_port *port = urb->context;
|
|
struct tty_struct *tty;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
int opcode = ((unsigned char *)urb->transfer_buffer)[0];
|
|
int len = ((unsigned char *)urb->transfer_buffer)[1];
|
|
int port_status = ((unsigned char *)urb->transfer_buffer)[2];
|
|
unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
|
|
int flag, throttled;
|
|
int status = urb->status;
|
|
|
|
/* do not process callbacks on closed ports */
|
|
/* but do continue the read chain */
|
|
if (urb->status == -ENOENT)
|
|
return 0;
|
|
|
|
/* short/multiple packet check */
|
|
if (urb->actual_length != len + 2) {
|
|
dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
|
|
"status=%d, port=%d, opcode=%d, len=%d, "
|
|
"actual_length=%d, status=%d\n", __func__, status,
|
|
priv->dp_port_num, opcode, len, urb->actual_length,
|
|
port_status);
|
|
return -1;
|
|
}
|
|
|
|
tty = tty_port_tty_get(&port->port);
|
|
spin_lock(&priv->dp_port_lock);
|
|
|
|
/* check for throttle; if set, do not resubmit read urb */
|
|
/* indicate the read chain needs to be restarted on unthrottle */
|
|
throttled = priv->dp_throttled;
|
|
if (throttled)
|
|
priv->dp_throttle_restart = 1;
|
|
|
|
/* receive data */
|
|
if (tty && opcode == DIGI_CMD_RECEIVE_DATA) {
|
|
/* get flag from port_status */
|
|
flag = 0;
|
|
|
|
/* overrun is special, not associated with a char */
|
|
if (port_status & DIGI_OVERRUN_ERROR)
|
|
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
|
|
|
|
/* break takes precedence over parity, */
|
|
/* which takes precedence over framing errors */
|
|
if (port_status & DIGI_BREAK_ERROR)
|
|
flag = TTY_BREAK;
|
|
else if (port_status & DIGI_PARITY_ERROR)
|
|
flag = TTY_PARITY;
|
|
else if (port_status & DIGI_FRAMING_ERROR)
|
|
flag = TTY_FRAME;
|
|
|
|
/* data length is len-1 (one byte of len is port_status) */
|
|
--len;
|
|
if (len > 0) {
|
|
tty_insert_flip_string_fixed_flag(tty, data, flag,
|
|
len);
|
|
tty_flip_buffer_push(tty);
|
|
}
|
|
}
|
|
spin_unlock(&priv->dp_port_lock);
|
|
tty_kref_put(tty);
|
|
|
|
if (opcode == DIGI_CMD_RECEIVE_DISABLE)
|
|
dbg("%s: got RECEIVE_DISABLE", __func__);
|
|
else if (opcode != DIGI_CMD_RECEIVE_DATA)
|
|
dbg("%s: unknown opcode: %d", __func__, opcode);
|
|
|
|
return throttled ? 1 : 0;
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* Digi Read OOB Callback
|
|
*
|
|
* Digi Read OOB Callback handles reads on the out of band port.
|
|
* When called we know port and port->private are not NULL and
|
|
* the port->serial is valid. It returns 0 if successful, and
|
|
* -1 if the sanity checks failed.
|
|
*/
|
|
|
|
static int digi_read_oob_callback(struct urb *urb)
|
|
{
|
|
|
|
struct usb_serial_port *port = urb->context;
|
|
struct usb_serial *serial = port->serial;
|
|
struct tty_struct *tty;
|
|
struct digi_port *priv = usb_get_serial_port_data(port);
|
|
int opcode, line, status, val;
|
|
int i;
|
|
unsigned int rts;
|
|
|
|
dbg("digi_read_oob_callback: port=%d, len=%d",
|
|
priv->dp_port_num, urb->actual_length);
|
|
|
|
/* handle each oob command */
|
|
for (i = 0; i < urb->actual_length - 3;) {
|
|
opcode = ((unsigned char *)urb->transfer_buffer)[i++];
|
|
line = ((unsigned char *)urb->transfer_buffer)[i++];
|
|
status = ((unsigned char *)urb->transfer_buffer)[i++];
|
|
val = ((unsigned char *)urb->transfer_buffer)[i++];
|
|
|
|
dbg("digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d",
|
|
opcode, line, status, val);
|
|
|
|
if (status != 0 || line >= serial->type->num_ports)
|
|
continue;
|
|
|
|
port = serial->port[line];
|
|
|
|
priv = usb_get_serial_port_data(port);
|
|
if (priv == NULL)
|
|
return -1;
|
|
|
|
tty = tty_port_tty_get(&port->port);
|
|
|
|
rts = 0;
|
|
if (tty)
|
|
rts = tty->termios->c_cflag & CRTSCTS;
|
|
|
|
if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
|
|
spin_lock(&priv->dp_port_lock);
|
|
/* convert from digi flags to termiox flags */
|
|
if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
|
|
priv->dp_modem_signals |= TIOCM_CTS;
|
|
/* port must be open to use tty struct */
|
|
if (rts) {
|
|
tty->hw_stopped = 0;
|
|
digi_wakeup_write(port);
|
|
}
|
|
} else {
|
|
priv->dp_modem_signals &= ~TIOCM_CTS;
|
|
/* port must be open to use tty struct */
|
|
if (rts)
|
|
tty->hw_stopped = 1;
|
|
}
|
|
if (val & DIGI_READ_INPUT_SIGNALS_DSR)
|
|
priv->dp_modem_signals |= TIOCM_DSR;
|
|
else
|
|
priv->dp_modem_signals &= ~TIOCM_DSR;
|
|
if (val & DIGI_READ_INPUT_SIGNALS_RI)
|
|
priv->dp_modem_signals |= TIOCM_RI;
|
|
else
|
|
priv->dp_modem_signals &= ~TIOCM_RI;
|
|
if (val & DIGI_READ_INPUT_SIGNALS_DCD)
|
|
priv->dp_modem_signals |= TIOCM_CD;
|
|
else
|
|
priv->dp_modem_signals &= ~TIOCM_CD;
|
|
|
|
wake_up_interruptible(&priv->dp_modem_change_wait);
|
|
spin_unlock(&priv->dp_port_lock);
|
|
} else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
|
|
spin_lock(&priv->dp_port_lock);
|
|
priv->dp_transmit_idle = 1;
|
|
wake_up_interruptible(&priv->dp_transmit_idle_wait);
|
|
spin_unlock(&priv->dp_port_lock);
|
|
} else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
|
|
wake_up_interruptible(&priv->dp_flush_wait);
|
|
}
|
|
tty_kref_put(tty);
|
|
}
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int __init digi_init(void)
|
|
{
|
|
int retval;
|
|
retval = usb_serial_register(&digi_acceleport_2_device);
|
|
if (retval)
|
|
goto failed_acceleport_2_device;
|
|
retval = usb_serial_register(&digi_acceleport_4_device);
|
|
if (retval)
|
|
goto failed_acceleport_4_device;
|
|
retval = usb_register(&digi_driver);
|
|
if (retval)
|
|
goto failed_usb_register;
|
|
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
|
|
DRIVER_DESC "\n");
|
|
return 0;
|
|
failed_usb_register:
|
|
usb_serial_deregister(&digi_acceleport_4_device);
|
|
failed_acceleport_4_device:
|
|
usb_serial_deregister(&digi_acceleport_2_device);
|
|
failed_acceleport_2_device:
|
|
return retval;
|
|
}
|
|
|
|
static void __exit digi_exit (void)
|
|
{
|
|
usb_deregister(&digi_driver);
|
|
usb_serial_deregister(&digi_acceleport_2_device);
|
|
usb_serial_deregister(&digi_acceleport_4_device);
|
|
}
|
|
|
|
|
|
module_init(digi_init);
|
|
module_exit(digi_exit);
|
|
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|