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linux/drivers/usb/serial/digi_acceleport.c
Oliver Neukum 0915f490d8 USB: last abuses of intfdata in close for usb-serial drivers 
these drivers abused intfdata in close() as flags for binding.
That races with reprobing of those devices. This patch fixes that by using
the flag and the locks introduced with the patch against mos7720.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-02-01 14:35:05 -08:00

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/*
* Digi AccelePort USB-4 and USB-2 Serial Converters
*
* Copyright 2000 by Digi International
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
* usb-serial driver.
*
* Peter Berger (pberger@brimson.com)
* Al Borchers (borchers@steinerpoint.com)
*
* (12/03/2001) gkh
* switched to using port->open_count instead of private version.
* Removed port->active
*
* (04/08/2001) gb
* Identify version on module load.
*
* (11/01/2000) Adam J. Richter
* usb_device_id table support
*
* (11/01/2000) pberger and borchers
* -- Turned off the USB_DISABLE_SPD flag for write bulk urbs--it caused
* USB 4 ports to hang on startup.
* -- Serialized access to write urbs by adding the dp_write_urb_in_use
* flag; otherwise, the driver caused SMP system hangs. Watching the
* urb status is not sufficient.
*
* (10/05/2000) gkh
* -- Fixed bug with urb->dev not being set properly, now that the usb
* core needs it.
*
* (8/8/2000) pberger and borchers
* -- Fixed close so that
* - it can timeout while waiting for transmit idle, if needed;
* - it ignores interrupts when flushing the port, turning
* of modem signalling, and so on;
* - it waits for the flush to really complete before returning.
* -- Read_bulk_callback and write_bulk_callback check for a closed
* port before using the tty struct or writing to the port.
* -- The two changes above fix the oops caused by interrupted closes.
* -- Added interruptible args to write_oob_command and set_modem_signals
* and added a timeout arg to transmit_idle; needed for fixes to
* close.
* -- Added code for rx_throttle and rx_unthrottle so that input flow
* control works.
* -- Added code to set overrun, parity, framing, and break errors
* (untested).
* -- Set USB_DISABLE_SPD flag for write bulk urbs, so no 0 length
* bulk writes are done. These hung the Digi USB device. The
* 0 length bulk writes were a new feature of usb-uhci added in
* the 2.4.0-test6 kernels.
* -- Fixed mod inc race in open; do mod inc before sleeping to wait
* for a close to finish.
*
* (7/31/2000) pberger
* -- Fixed bugs with hardware handshaking:
* - Added code to set/clear tty->hw_stopped in digi_read_oob_callback()
* and digi_set_termios()
* -- Added code in digi_set_termios() to
* - add conditional in code handling transition from B0 to only
* set RTS if RTS/CTS flow control is either not in use or if
* the port is not currently throttled.
* - handle turning off CRTSCTS.
*
* (7/30/2000) borchers
* -- Added support for more than one Digi USB device by moving
* globals to a private structure in the pointed to from the
* usb_serial structure.
* -- Moved the modem change and transmit idle wait queues into
* the port private structure, so each port has its own queue
* rather than sharing global queues.
* -- Added support for break signals.
*
* (7/25/2000) pberger
* -- Added USB-2 support. Note: the USB-2 supports 3 devices: two
* serial and a parallel port. The parallel port is implemented
* as a serial-to-parallel converter. That is, the driver actually
* presents all three USB-2 interfaces as serial ports, but the third
* one physically connects to a parallel device. Thus, for example,
* one could plug a parallel printer into the USB-2's third port,
* but from the kernel's (and userland's) point of view what's
* actually out there is a serial device.
*
* (7/15/2000) borchers
* -- Fixed race in open when a close is in progress.
* -- Keep count of opens and dec the module use count for each
* outstanding open when shutdown is called (on disconnect).
* -- Fixed sanity checks in read_bulk_callback and write_bulk_callback
* so pointers are checked before use.
* -- Split read bulk callback into in band and out of band
* callbacks, and no longer restart read chains if there is
* a status error or a sanity error. This fixed the seg
* faults and other errors we used to get on disconnect.
* -- Port->active is once again a flag as usb-serial intended it
* to be, not a count. Since it was only a char it would
* have been limited to 256 simultaneous opens. Now the open
* count is kept in the port private structure in dp_open_count.
* -- Added code for modularization of the digi_acceleport driver.
*
* (6/27/2000) pberger and borchers
* -- Zeroed out sync field in the wakeup_task before first use;
* otherwise the uninitialized value might prevent the task from
* being scheduled.
* -- Initialized ret value to 0 in write_bulk_callback, otherwise
* the uninitialized value could cause a spurious debugging message.
*
* (6/22/2000) pberger and borchers
* -- Made cond_wait_... inline--apparently on SPARC the flags arg
* to spin_lock_irqsave cannot be passed to another function
* to call spin_unlock_irqrestore. Thanks to Pauline Middelink.
* -- In digi_set_modem_signals the inner nested spin locks use just
* spin_lock() rather than spin_lock_irqsave(). The old code
* mistakenly left interrupts off. Thanks to Pauline Middelink.
* -- copy_from_user (which can sleep) is no longer called while a
* spinlock is held. We copy to a local buffer before getting
* the spinlock--don't like the extra copy but the code is simpler.
* -- Printk and dbg are no longer called while a spin lock is held.
*
* (6/4/2000) pberger and borchers
* -- Replaced separate calls to spin_unlock_irqrestore and
* interruptible_sleep_on_timeout with a new function
* cond_wait_interruptible_timeout_irqrestore. This eliminates
* the race condition where the wake up could happen after
* the unlock and before the sleep.
* -- Close now waits for output to drain.
* -- Open waits until any close in progress is finished.
* -- All out of band responses are now processed, not just the
* first in a USB packet.
* -- Fixed a bug that prevented the driver from working when the
* first Digi port was not the first USB serial port--the driver
* was mistakenly using the external USB serial port number to
* try to index into its internal ports.
* -- Fixed an SMP bug -- write_bulk_callback is called directly from
* an interrupt, so spin_lock_irqsave/spin_unlock_irqrestore are
* needed for locks outside write_bulk_callback that are also
* acquired by write_bulk_callback to prevent deadlocks.
* -- Fixed support for select() by making digi_chars_in_buffer()
* return 256 when -EINPROGRESS is set, as the line discipline
* code in n_tty.c expects.
* -- Fixed an include file ordering problem that prevented debugging
* messages from working.
* -- Fixed an intermittent timeout problem that caused writes to
* sometimes get stuck on some machines on some kernels. It turns
* out in these circumstances write_chan() (in n_tty.c) was
* asleep waiting for our wakeup call. Even though we call
* wake_up_interruptible() in digi_write_bulk_callback(), there is
* a race condition that could cause the wakeup to fail: if our
* wake_up_interruptible() call occurs between the time that our
* driver write routine finishes and write_chan() sets current->state
* to TASK_INTERRUPTIBLE, the effect of our wakeup setting the state
* to TASK_RUNNING will be lost and write_chan's subsequent call to
* schedule() will never return (unless it catches a signal).
* This race condition occurs because write_bulk_callback() (and thus
* the wakeup) are called asynchronously from an interrupt, rather than
* from the scheduler. We can avoid the race by calling the wakeup
* from the scheduler queue and that's our fix: Now, at the end of
* write_bulk_callback() we queue up a wakeup call on the scheduler
* task queue. We still also invoke the wakeup directly since that
* squeezes a bit more performance out of the driver, and any lost
* race conditions will get cleaned up at the next scheduler run.
*
* NOTE: The problem also goes away if you comment out
* the two code lines in write_chan() where current->state
* is set to TASK_RUNNING just before calling driver.write() and to
* TASK_INTERRUPTIBLE immediately afterwards. This is why the
* problem did not show up with the 2.2 kernels -- they do not
* include that code.
*
* (5/16/2000) pberger and borchers
* -- Added timeouts to sleeps, to defend against lost wake ups.
* -- Handle transition to/from B0 baud rate in digi_set_termios.
*
* (5/13/2000) pberger and borchers
* -- All commands now sent on out of band port, using
* digi_write_oob_command.
* -- Get modem control signals whenever they change, support TIOCMGET/
* SET/BIS/BIC ioctls.
* -- digi_set_termios now supports parity, word size, stop bits, and
* receive enable.
* -- Cleaned up open and close, use digi_set_termios and
* digi_write_oob_command to set port parameters.
* -- Added digi_startup_device to start read chains on all ports.
* -- Write buffer is only used when count==1, to be sure put_char can
* write a char (unless the buffer is full).
*
* (5/10/2000) pberger and borchers
* -- Added MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT calls on open/close.
* -- Fixed problem where the first incoming character is lost on
* port opens after the first close on that port. Now we keep
* the read_urb chain open until shutdown.
* -- Added more port conditioning calls in digi_open and digi_close.
* -- Convert port->active to a use count so that we can deal with multiple
* opens and closes properly.
* -- Fixed some problems with the locking code.
*
* (5/3/2000) pberger and borchers
* -- First alpha version of the driver--many known limitations and bugs.
*
*
* Locking and SMP
*
* - Each port, including the out-of-band port, has a lock used to
* serialize all access to the port's private structure.
* - The port lock is also used to serialize all writes and access to
* the port's URB.
* - The port lock is also used for the port write_wait condition
* variable. Holding the port lock will prevent a wake up on the
* port's write_wait; this can be used with cond_wait_... to be sure
* the wake up is not lost in a race when dropping the lock and
* sleeping waiting for the wakeup.
* - digi_write() does not sleep, since it is sometimes called on
* interrupt time.
* - digi_write_bulk_callback() and digi_read_bulk_callback() are
* called directly from interrupts. Hence spin_lock_irqsave()
* and spin_unlock_irqrestore() are used in the rest of the code
* for any locks they acquire.
* - digi_write_bulk_callback() gets the port lock before waking up
* processes sleeping on the port write_wait. It also schedules
* wake ups so they happen from the scheduler, because the tty
* system can miss wake ups from interrupts.
* - All sleeps use a timeout of DIGI_RETRY_TIMEOUT before looping to
* recheck the condition they are sleeping on. This is defensive,
* in case a wake up is lost.
* - Following Documentation/DocBook/kernel-locking.pdf no spin locks
* are held when calling copy_to/from_user or printk.
*
* $Id: digi_acceleport.c,v 1.80.1.2 2000/11/02 05:45:08 root Exp $
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/wait.h>
#include <linux/usb/serial.h>
/* Defines */
/*
* Version Information
*/
#define DRIVER_VERSION "v1.80.1.2"
#define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
#define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
/* port output buffer length -- must be <= transfer buffer length - 2 */
/* so we can be sure to send the full buffer in one urb */
#define DIGI_OUT_BUF_SIZE 8
/* port input buffer length -- must be >= transfer buffer length - 3 */
/* so we can be sure to hold at least one full buffer from one urb */
#define DIGI_IN_BUF_SIZE 64
/* retry timeout while sleeping */
#define DIGI_RETRY_TIMEOUT (HZ/10)
/* timeout while waiting for tty output to drain in close */
/* this delay is used twice in close, so the total delay could */
/* be twice this value */
#define DIGI_CLOSE_TIMEOUT (5*HZ)
/* AccelePort USB Defines */
/* ids */
#define DIGI_VENDOR_ID 0x05c5
#define DIGI_2_ID 0x0002 /* USB-2 */
#define DIGI_4_ID 0x0004 /* USB-4 */
/* commands
* "INB": can be used on the in-band endpoint
* "OOB": can be used on the out-of-band endpoint
*/
#define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
#define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
#define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
#define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
#define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
#define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
#define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
#define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
#define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
#define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
#define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
#define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
#define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
#define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
#define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
#define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
#define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
#define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
#define DIGI_CMD_SEND_DATA 18 /* INB */
#define DIGI_CMD_RECEIVE_DATA 19 /* INB */
#define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
#define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
/* baud rates */
#define DIGI_BAUD_50 0
#define DIGI_BAUD_75 1
#define DIGI_BAUD_110 2
#define DIGI_BAUD_150 3
#define DIGI_BAUD_200 4
#define DIGI_BAUD_300 5
#define DIGI_BAUD_600 6
#define DIGI_BAUD_1200 7
#define DIGI_BAUD_1800 8
#define DIGI_BAUD_2400 9
#define DIGI_BAUD_4800 10
#define DIGI_BAUD_7200 11
#define DIGI_BAUD_9600 12
#define DIGI_BAUD_14400 13
#define DIGI_BAUD_19200 14
#define DIGI_BAUD_28800 15
#define DIGI_BAUD_38400 16
#define DIGI_BAUD_57600 17
#define DIGI_BAUD_76800 18
#define DIGI_BAUD_115200 19
#define DIGI_BAUD_153600 20
#define DIGI_BAUD_230400 21
#define DIGI_BAUD_460800 22
/* arguments */
#define DIGI_WORD_SIZE_5 0
#define DIGI_WORD_SIZE_6 1
#define DIGI_WORD_SIZE_7 2
#define DIGI_WORD_SIZE_8 3
#define DIGI_PARITY_NONE 0
#define DIGI_PARITY_ODD 1
#define DIGI_PARITY_EVEN 2
#define DIGI_PARITY_MARK 3
#define DIGI_PARITY_SPACE 4
#define DIGI_STOP_BITS_1 0
#define DIGI_STOP_BITS_2 1
#define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
#define DIGI_INPUT_FLOW_CONTROL_RTS 2
#define DIGI_INPUT_FLOW_CONTROL_DTR 4
#define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
#define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
#define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
#define DIGI_DTR_INACTIVE 0
#define DIGI_DTR_ACTIVE 1
#define DIGI_DTR_INPUT_FLOW_CONTROL 2
#define DIGI_RTS_INACTIVE 0
#define DIGI_RTS_ACTIVE 1
#define DIGI_RTS_INPUT_FLOW_CONTROL 2
#define DIGI_RTS_TOGGLE 3
#define DIGI_FLUSH_TX 1
#define DIGI_FLUSH_RX 2
#define DIGI_RESUME_TX 4 /* clears xoff condition */
#define DIGI_TRANSMIT_NOT_IDLE 0
#define DIGI_TRANSMIT_IDLE 1
#define DIGI_DISABLE 0
#define DIGI_ENABLE 1
#define DIGI_DEASSERT 0
#define DIGI_ASSERT 1
/* in band status codes */
#define DIGI_OVERRUN_ERROR 4
#define DIGI_PARITY_ERROR 8
#define DIGI_FRAMING_ERROR 16
#define DIGI_BREAK_ERROR 32
/* out of band status */
#define DIGI_NO_ERROR 0
#define DIGI_BAD_FIRST_PARAMETER 1
#define DIGI_BAD_SECOND_PARAMETER 2
#define DIGI_INVALID_LINE 3
#define DIGI_INVALID_OPCODE 4
/* input signals */
#define DIGI_READ_INPUT_SIGNALS_SLOT 1
#define DIGI_READ_INPUT_SIGNALS_ERR 2
#define DIGI_READ_INPUT_SIGNALS_BUSY 4
#define DIGI_READ_INPUT_SIGNALS_PE 8
#define DIGI_READ_INPUT_SIGNALS_CTS 16
#define DIGI_READ_INPUT_SIGNALS_DSR 32
#define DIGI_READ_INPUT_SIGNALS_RI 64
#define DIGI_READ_INPUT_SIGNALS_DCD 128
/* Structures */
struct digi_serial {
spinlock_t ds_serial_lock;
struct usb_serial_port *ds_oob_port; /* out-of-band port */
int ds_oob_port_num; /* index of out-of-band port */
int ds_device_started;
};
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;
int dp_in_close; /* close in progress */
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 usb_serial_port *port);
static void digi_rx_unthrottle (struct usb_serial_port *port);
static void digi_set_termios(struct usb_serial_port *port,
struct ktermios *old_termios);
static void digi_break_ctl(struct usb_serial_port *port, int break_state);
static int digi_ioctl(struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg);
static int digi_tiocmget(struct usb_serial_port *port, struct file *file);
static int digi_tiocmset(struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear);
static int digi_write(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 usb_serial_port *port);
static int digi_chars_in_buffer(struct usb_serial_port *port);
static int digi_open(struct usb_serial_port *port, struct file *filp);
static void digi_close(struct usb_serial_port *port, struct file *filp);
static int digi_startup_device(struct usb_serial *serial);
static int digi_startup(struct usb_serial *serial);
static void digi_shutdown(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 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 struct usb_device_id id_table_2 [] = {
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
{ } /* Terminating entry */
};
static 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_interrupt_in = 0,
.num_bulk_in = 4,
.num_bulk_out = 4,
.num_ports = 3,
.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,
.ioctl = digi_ioctl,
.set_termios = digi_set_termios,
.break_ctl = digi_break_ctl,
.tiocmget = digi_tiocmget,
.tiocmset = digi_tiocmset,
.attach = digi_startup,
.shutdown = digi_shutdown,
};
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_interrupt_in = 0,
.num_bulk_in = 5,
.num_bulk_out = 5,
.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,
.ioctl = digi_ioctl,
.set_termios = digi_set_termios,
.break_ctl = digi_break_ctl,
.tiocmget = digi_tiocmget,
.tiocmset = digi_tiocmset,
.attach = digi_startup,
.shutdown = digi_shutdown,
};
/* 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)
{
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)
{
tty_wakeup(port->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_port->write_urb->status == -EINPROGRESS
|| 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;
if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 0) {
oob_priv->dp_write_urb_in_use = 1;
count -= len;
buf += len;
}
}
spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
if (ret)
err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 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((port->write_urb->status == -EINPROGRESS
|| 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;
if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 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)
err("%s: usb_submit_urb failed, ret=%d, port=%d",
__FUNCTION__, 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_port->write_urb->status == -EINPROGRESS || 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;
if ((ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC)) == 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)
err("%s: usb_submit_urb failed, ret=%d", __FUNCTION__, 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;
if ((ret = digi_write_inb_command(port, buf, 2, timeout - jiffies)) != 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 usb_serial_port *port)
{
unsigned long flags;
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 usb_serial_port *port)
{
int ret = 0;
unsigned long flags;
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);
/* turn throttle off */
priv->dp_throttled = 0;
priv->dp_throttle_restart = 0;
/* restart read chain */
if (priv->dp_throttle_restart) {
port->read_urb->dev = port->serial->dev;
ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
}
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
if (ret)
err("%s: usb_submit_urb failed, ret=%d, port=%d",
__FUNCTION__, ret, priv->dp_port_num);
}
static void digi_set_termios(struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct digi_port *priv = usb_get_serial_port_data(port);
struct tty_struct *tty = port->tty;
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 */
if ((baud = tty_get_baud_rate(tty)) != 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;
}
if ((ret = digi_write_oob_command(port, buf, i, 1)) != 0)
dbg("digi_set_termios: write oob failed, ret=%d", ret);
tty_encode_baud_rate(tty, baud, baud);
}
static void digi_break_ctl(struct usb_serial_port *port, int break_state)
{
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 usb_serial_port *port, struct file *file)
{
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned int val;
unsigned long flags;
dbg("%s: TOP: port=%d", __FUNCTION__, 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 usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear)
{
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned int val;
unsigned long flags;
dbg("%s: TOP: port=%d", __FUNCTION__, 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_ioctl(struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct digi_port *priv = usb_get_serial_port_data(port);
dbg("digi_ioctl: TOP: port=%d, cmd=0x%x", priv->dp_port_num, cmd);
switch (cmd) {
case TIOCMIWAIT:
/* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
/* TODO */
return 0;
case TIOCGICOUNT:
/* return count of modemline transitions */
/* TODO */
return 0;
}
return -ENOIOCTLCMD;
}
static int digi_write(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 */
/* and races to check write_urb->status */
spin_lock_irqsave(&priv->dp_port_lock, flags);
/* wait for urb status clear to submit another urb */
if (port->write_urb->status == -EINPROGRESS || 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);
if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 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)
err("%s: usb_submit_urb failed, ret=%d, port=%d",
__FUNCTION__, 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 = (struct usb_serial_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, urb->status=%d", status);
/* port and serial sanity check */
if (port == NULL || (priv=usb_get_serial_port_data(port)) == NULL) {
err("%s: port or port->private is NULL, status=%d",
__FUNCTION__, status);
return;
}
serial = port->serial;
if (serial == NULL || (serial_priv=usb_get_serial_data(serial)) == NULL) {
err("%s: serial or serial->private is NULL, status=%d",
__FUNCTION__, 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, if it is open */
spin_lock(&priv->dp_port_lock);
priv->dp_write_urb_in_use = 0;
if (port->open_count && port->write_urb->status != -EINPROGRESS
&& 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);
if ((ret = usb_submit_urb(port->write_urb, GFP_ATOMIC)) == 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)
err("%s: usb_submit_urb failed, ret=%d, port=%d",
__FUNCTION__, ret, priv->dp_port_num);
}
static int digi_write_room(struct usb_serial_port *port)
{
int room;
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned long flags = 0;
spin_lock_irqsave(&priv->dp_port_lock, flags);
if (port->write_urb->status == -EINPROGRESS || 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 usb_serial_port *port)
{
struct digi_port *priv = usb_get_serial_port_data(port);
if (port->write_urb->status == -EINPROGRESS
|| 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 int digi_open(struct usb_serial_port *port, struct file *filp)
{
int ret;
unsigned char buf[32];
struct digi_port *priv = usb_get_serial_port_data(port);
struct ktermios not_termios;
unsigned long flags = 0;
dbg("digi_open: TOP: port=%d, open_count=%d",
priv->dp_port_num, port->open_count);
/* be sure the device is started up */
if (digi_startup_device(port->serial) != 0)
return -ENXIO;
spin_lock_irqsave(&priv->dp_port_lock, flags);
/* don't wait on a close in progress for non-blocking opens */
if (priv->dp_in_close && (filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
return -EAGAIN;
}
/* wait for a close in progress to finish */
while(priv->dp_in_close) {
cond_wait_interruptible_timeout_irqrestore(
&priv->dp_close_wait, DIGI_RETRY_TIMEOUT,
&priv->dp_port_lock, flags);
if (signal_pending(current))
return -EINTR;
spin_lock_irqsave(&priv->dp_port_lock, flags);
}
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
/* 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;
if ((ret = digi_write_oob_command(port, buf, 8, 1)) != 0)
dbg("digi_open: write oob failed, ret=%d", ret);
/* set termios settings */
not_termios.c_cflag = ~port->tty->termios->c_cflag;
not_termios.c_iflag = ~port->tty->termios->c_iflag;
digi_set_termios(port, &not_termios);
/* set DTR and RTS */
digi_set_modem_signals(port, TIOCM_DTR|TIOCM_RTS, 1);
return 0;
}
static void digi_close(struct usb_serial_port *port, struct file *filp)
{
DEFINE_WAIT(wait);
int ret;
unsigned char buf[32];
struct tty_struct *tty = port->tty;
struct digi_port *priv = usb_get_serial_port_data(port);
dbg("digi_close: TOP: port=%d, open_count=%d",
priv->dp_port_num, port->open_count);
mutex_lock(&port->serial->disc_mutex);
/* if disconnected, just clear flags */
if (port->serial->disconnected)
goto exit;
/* do cleanup only after final close on this port */
spin_lock_irq(&priv->dp_port_lock);
priv->dp_in_close = 1;
spin_unlock_irq(&priv->dp_port_lock);
/* tell line discipline to process only XON/XOFF */
tty->closing = 1;
/* wait for output to drain */
if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0)
tty_wait_until_sent(tty, DIGI_CLOSE_TIMEOUT);
/* flush driver and line discipline buffers */
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
if (port->serial->dev) {
/* wait for transmit idle */
if ((filp->f_flags&(O_NDELAY|O_NONBLOCK)) == 0) {
digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
}
/* drop DTR and RTS */
digi_set_modem_signals(port, 0, 0);
/* 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;
if ((ret = digi_write_oob_command(port, buf, 20, 0)) != 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);
}
tty->closing = 0;
exit:
spin_lock_irq(&priv->dp_port_lock);
priv->dp_write_urb_in_use = 0;
priv->dp_in_close = 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;
if ((ret = usb_submit_urb(port->read_urb, GFP_KERNEL)) != 0) {
err("%s: usb_submit_urb failed, ret=%d, port=%d",
__FUNCTION__, 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);
priv->dp_in_close = 0;
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_shutdown(struct usb_serial *serial)
{
int i;
dbg("digi_shutdown: 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);
}
/* 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 = (struct usb_serial_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 || (priv = usb_get_serial_port_data(port)) == NULL) {
err("%s: port or port->private is NULL, status=%d",
__FUNCTION__, status);
return;
}
if (port->serial == NULL ||
(serial_priv=usb_get_serial_data(port->serial)) == NULL) {
err("%s: serial is bad or serial->private is NULL, status=%d",
__FUNCTION__, status);
return;
}
/* do not resubmit urb if it has any status error */
if (status) {
err("%s: nonzero read bulk status: status=%d, port=%d",
__FUNCTION__, 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;
if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) != 0) {
err("%s: failed resubmitting urb, ret=%d, port=%d",
__FUNCTION__, 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 = (struct usb_serial_port *)urb->context;
struct tty_struct *tty = port->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 i;
int status = urb->status;
/* do not process callbacks on closed ports */
/* but do continue the read chain */
if (port->open_count == 0)
return 0;
/* short/multiple packet check */
if (urb->actual_length != len + 2) {
err("%s: INCOMPLETE OR MULTIPLE PACKET, urb->status=%d, "
"port=%d, opcode=%d, len=%d, actual_length=%d, "
"status=%d", __FUNCTION__, status, priv->dp_port_num,
opcode, len, urb->actual_length, port_status);
return -1;
}
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 (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;
len = tty_buffer_request_room(tty, len);
if (len > 0) {
/* Hot path */
if (flag == TTY_NORMAL)
tty_insert_flip_string(tty, data, len);
else {
for(i = 0; i < len; i++)
tty_insert_flip_char(tty, data[i], flag);
}
tty_flip_buffer_push(tty);
}
}
spin_unlock(&priv->dp_port_lock);
if (opcode == DIGI_CMD_RECEIVE_DISABLE)
dbg("%s: got RECEIVE_DISABLE", __FUNCTION__);
else if (opcode != DIGI_CMD_RECEIVE_DATA)
dbg("%s: unknown opcode: %d", __FUNCTION__, 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 = (struct usb_serial_port *)urb->context;
struct usb_serial *serial = port->serial;
struct digi_port *priv = usb_get_serial_port_data(port);
int opcode, line, status, val;
int i;
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];
if ((priv=usb_get_serial_port_data(port)) == NULL)
return -1;
if (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 (port->open_count
&& port->tty->termios->c_cflag & CRTSCTS) {
port->tty->hw_stopped = 0;
digi_wakeup_write(port);
}
} else {
priv->dp_modem_signals &= ~TIOCM_CTS;
/* port must be open to use tty struct */
if (port->open_count
&& port->tty->termios->c_cflag & CRTSCTS) {
port->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);
}
}
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;
info(DRIVER_VERSION ":" DRIVER_DESC);
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");
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