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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/serial/digi_acceleport.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/usb/serial/digi_acceleport.c')
-rw-r--r--drivers/usb/serial/digi_acceleport.c2049
1 files changed, 2049 insertions, 0 deletions
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
new file mode 100644
index 000000000000..25f92788a6d4
--- /dev/null
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -0,0 +1,2049 @@
+/*
+* 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.
+*/
+
+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_UNINTERRUPTIBLE);
+ 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_UNINTERRUPTIBLE);
+ 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( &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");