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linux/drivers/usb/serial/digi_acceleport.c
Nishanth Aravamudan 45f23f189c [PATCH] USB: usb/digi_acceleport: correct wait-queue state 
First patch incorrectly changed state of the wait-queue usage to
TASK_UNINTERRUPTIBLE. Reverted to TASK_INTERRUPTIBLE.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-04-18 17:39:25 -07:00

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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 asynchonously 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/config.h>
#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 "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_in_buf_len;
unsigned char dp_in_buf[DIGI_IN_BUF_SIZE];
unsigned char dp_in_flag_buf[DIGI_IN_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;
};
/* Local Function Declarations */
static void digi_wakeup_write( struct usb_serial_port *port );
static void digi_wakeup_write_lock(void *);
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 termios *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, struct pt_regs *regs );
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, struct pt_regs *regs );
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 = {
.owner = THIS_MODULE,
.name = "digi_acceleport",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table_combined,
};
/* device info needed for the Digi serial converter */
static struct usb_serial_device_type digi_acceleport_2_device = {
.owner = THIS_MODULE,
.name = "Digi 2 port USB adapter",
.short_name = "digi_2",
.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_device_type digi_acceleport_4_device = {
.owner = THIS_MODULE,
.name = "Digi 4 port USB adapter",
.short_name = "digi_4",
.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 inline 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(void *arg)
{
struct usb_serial_port *port = arg;
unsigned long flags;
struct digi_port *priv = usb_get_serial_port_data(port);
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 = port->tty;
/* wake up port processes */
wake_up_interruptible( &port->write_wait );
/* wake up line discipline */
tty_wakeup(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;
priv->dp_in_buf_len = 0;
spin_unlock_irqrestore( &priv->dp_port_lock, flags );
}
static void digi_rx_unthrottle( struct usb_serial_port *port )
{
int ret = 0;
int len;
unsigned long flags;
struct digi_port *priv = usb_get_serial_port_data(port);
struct tty_struct *tty = port->tty;
dbg( "digi_rx_unthrottle: TOP: port=%d", priv->dp_port_num );
spin_lock_irqsave( &priv->dp_port_lock, flags );
/* send any buffered chars from throttle time on to tty subsystem */
len = min(priv->dp_in_buf_len, TTY_FLIPBUF_SIZE - tty->flip.count );
if( len > 0 ) {
memcpy( tty->flip.char_buf_ptr, priv->dp_in_buf, len );
memcpy( tty->flip.flag_buf_ptr, priv->dp_in_flag_buf, len );
tty->flip.char_buf_ptr += len;
tty->flip.flag_buf_ptr += len;
tty->flip.count += len;
tty_flip_buffer_push( tty );
}
/* 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_in_buf_len = 0;
priv->dp_throttle_restart = 0;
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 termios *old_termios )
{
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned int iflag = port->tty->termios->c_iflag;
unsigned int cflag = port->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;
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( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
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( !(port->tty->termios->c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &port->tty->flags) ) {
modem_signals |= TIOCM_RTS;
}
digi_set_modem_signals( port, modem_signals, 1 );
}
switch( (cflag&CBAUD) ) {
/* drop DTR and RTS on transition to B0 */
case B0: digi_set_modem_signals( port, 0, 1 ); break;
case B50: arg = DIGI_BAUD_50; break;
case B75: arg = DIGI_BAUD_75; break;
case B110: arg = DIGI_BAUD_110; break;
case B150: arg = DIGI_BAUD_150; break;
case B200: arg = DIGI_BAUD_200; break;
case B300: arg = DIGI_BAUD_300; break;
case B600: arg = DIGI_BAUD_600; break;
case B1200: arg = DIGI_BAUD_1200; break;
case B1800: arg = DIGI_BAUD_1800; break;
case B2400: arg = DIGI_BAUD_2400; break;
case B4800: arg = DIGI_BAUD_4800; break;
case B9600: arg = DIGI_BAUD_9600; break;
case B19200: arg = DIGI_BAUD_19200; break;
case B38400: arg = DIGI_BAUD_38400; break;
case B57600: arg = DIGI_BAUD_57600; break;
case B115200: arg = DIGI_BAUD_115200; break;
case B230400: arg = DIGI_BAUD_230400; break;
case B460800: arg = DIGI_BAUD_460800; break;
default:
dbg( "digi_set_termios: can't handle baud rate 0x%x",
(cflag&CBAUD) );
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 */
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;
port->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 );
}
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 pt_regs *regs )
{
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;
dbg( "digi_write_bulk_callback: TOP, urb->status=%d", urb->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__,
urb->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__, urb->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 termios 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);
unsigned long flags = 0;
dbg( "digi_close: TOP: port=%d, open_count=%d", priv->dp_port_num, port->open_count );
/* if disconnected, just clear flags */
if (!usb_get_intfdata(port->serial->interface))
goto exit;
/* do cleanup only after final close on this port */
spin_lock_irqsave( &priv->dp_port_lock, flags );
priv->dp_in_close = 1;
spin_unlock_irqrestore( &priv->dp_port_lock, flags );
/* 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_irqsave( &priv->dp_port_lock, flags );
priv->dp_write_urb_in_use = 0;
priv->dp_in_close = 0;
wake_up_interruptible( &priv->dp_close_wait );
spin_unlock_irqrestore( &priv->dp_port_lock, flags );
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 = (struct digi_port *)kmalloc( sizeof(struct digi_port),
GFP_KERNEL );
if( priv == (struct digi_port *)0 ) {
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_in_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, 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 = (struct digi_serial *)kmalloc( sizeof(struct digi_serial),
GFP_KERNEL );
if( serial_priv == (struct digi_serial *)0 ) {
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 pt_regs *regs )
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct digi_port *priv;
struct digi_serial *serial_priv;
int ret;
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__,
urb->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__, urb->status );
return;
}
/* do not resubmit urb if it has any status error */
if( urb->status ) {
err("%s: nonzero read bulk status: status=%d, port=%d", __FUNCTION__, urb->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 status = ((unsigned char *)urb->transfer_buffer)[2];
unsigned char *data = ((unsigned char *)urb->transfer_buffer)+3;
int flag,throttled;
/* 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__, urb->status, priv->dp_port_num, opcode, len, urb->actual_length, 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 status */
flag = 0;
/* overrun is special, not associated with a char */
if( status & DIGI_OVERRUN_ERROR ) {
tty_insert_flip_char( tty, 0, TTY_OVERRUN );
}
/* break takes precedence over parity, */
/* which takes precedence over framing errors */
if( status & DIGI_BREAK_ERROR ) {
flag = TTY_BREAK;
} else if( status & DIGI_PARITY_ERROR ) {
flag = TTY_PARITY;
} else if( status & DIGI_FRAMING_ERROR ) {
flag = TTY_FRAME;
}
/* data length is len-1 (one byte of len is status) */
--len;
if( throttled ) {
len = min( len,
DIGI_IN_BUF_SIZE - priv->dp_in_buf_len );
if( len > 0 ) {
memcpy( priv->dp_in_buf + priv->dp_in_buf_len,
data, len );
memset( priv->dp_in_flag_buf
+ priv->dp_in_buf_len, flag, len );
priv->dp_in_buf_len += len;
}
} else {
len = min( len, TTY_FLIPBUF_SIZE - tty->flip.count );
if( len > 0 ) {
memcpy( tty->flip.char_buf_ptr, data, len );
memset( tty->flip.flag_buf_ptr, flag, len );
tty->flip.char_buf_ptr += len;
tty->flip.flag_buf_ptr += len;
tty->flip.count += len;
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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