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linux_dsm_epyc7002/drivers/usb/serial/digi_acceleport.c
Jiri Slaby 2e124b4a39 TTY: switch tty_flip_buffer_push 
Now, we start converting tty buffer functions to actually use
tty_port. This will allow us to get rid of the need of tty in many
call sites. Only tty_port will needed and hence no more
tty_port_tty_get in those paths.

Now, the one where most of tty_port_tty_get gets removed:
tty_flip_buffer_push.

IOW we also closed all the races in drivers not using tty_port_tty_get
at all yet.

Also we move tty_flip_buffer_push declaration from include/linux/tty.h
to include/linux/tty_flip.h to all others while we are changing it
anyway.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-15 22:30:15 -08:00

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/*
* Digi AccelePort USB-4 and USB-2 Serial Converters
*
* Copyright 2000 by Digi International
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's
* usb-serial driver.
*
* Peter Berger (pberger@brimson.com)
* Al Borchers (borchers@steinerpoint.com)
*/
#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 <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/wait.h>
#include <linux/usb/serial.h>
/* Defines */
#define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>"
#define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver"
/* port output buffer length -- must be <= transfer buffer length - 2 */
/* so we can be sure to send the full buffer in one urb */
#define DIGI_OUT_BUF_SIZE 8
/* port input buffer length -- must be >= transfer buffer length - 3 */
/* so we can be sure to hold at least one full buffer from one urb */
#define DIGI_IN_BUF_SIZE 64
/* retry timeout while sleeping */
#define DIGI_RETRY_TIMEOUT (HZ/10)
/* timeout while waiting for tty output to drain in close */
/* this delay is used twice in close, so the total delay could */
/* be twice this value */
#define DIGI_CLOSE_TIMEOUT (5*HZ)
/* AccelePort USB Defines */
/* ids */
#define DIGI_VENDOR_ID 0x05c5
#define DIGI_2_ID 0x0002 /* USB-2 */
#define DIGI_4_ID 0x0004 /* USB-4 */
/* commands
* "INB": can be used on the in-band endpoint
* "OOB": can be used on the out-of-band endpoint
*/
#define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */
#define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */
#define DIGI_CMD_SET_PARITY 2 /* INB, OOB */
#define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */
#define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */
#define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */
#define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */
#define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */
#define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */
#define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */
#define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */
#define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */
#define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */
#define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */
#define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */
#define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */
#define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */
#define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */
#define DIGI_CMD_SEND_DATA 18 /* INB */
#define DIGI_CMD_RECEIVE_DATA 19 /* INB */
#define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */
#define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */
/* baud rates */
#define DIGI_BAUD_50 0
#define DIGI_BAUD_75 1
#define DIGI_BAUD_110 2
#define DIGI_BAUD_150 3
#define DIGI_BAUD_200 4
#define DIGI_BAUD_300 5
#define DIGI_BAUD_600 6
#define DIGI_BAUD_1200 7
#define DIGI_BAUD_1800 8
#define DIGI_BAUD_2400 9
#define DIGI_BAUD_4800 10
#define DIGI_BAUD_7200 11
#define DIGI_BAUD_9600 12
#define DIGI_BAUD_14400 13
#define DIGI_BAUD_19200 14
#define DIGI_BAUD_28800 15
#define DIGI_BAUD_38400 16
#define DIGI_BAUD_57600 17
#define DIGI_BAUD_76800 18
#define DIGI_BAUD_115200 19
#define DIGI_BAUD_153600 20
#define DIGI_BAUD_230400 21
#define DIGI_BAUD_460800 22
/* arguments */
#define DIGI_WORD_SIZE_5 0
#define DIGI_WORD_SIZE_6 1
#define DIGI_WORD_SIZE_7 2
#define DIGI_WORD_SIZE_8 3
#define DIGI_PARITY_NONE 0
#define DIGI_PARITY_ODD 1
#define DIGI_PARITY_EVEN 2
#define DIGI_PARITY_MARK 3
#define DIGI_PARITY_SPACE 4
#define DIGI_STOP_BITS_1 0
#define DIGI_STOP_BITS_2 1
#define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1
#define DIGI_INPUT_FLOW_CONTROL_RTS 2
#define DIGI_INPUT_FLOW_CONTROL_DTR 4
#define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1
#define DIGI_OUTPUT_FLOW_CONTROL_CTS 2
#define DIGI_OUTPUT_FLOW_CONTROL_DSR 4
#define DIGI_DTR_INACTIVE 0
#define DIGI_DTR_ACTIVE 1
#define DIGI_DTR_INPUT_FLOW_CONTROL 2
#define DIGI_RTS_INACTIVE 0
#define DIGI_RTS_ACTIVE 1
#define DIGI_RTS_INPUT_FLOW_CONTROL 2
#define DIGI_RTS_TOGGLE 3
#define DIGI_FLUSH_TX 1
#define DIGI_FLUSH_RX 2
#define DIGI_RESUME_TX 4 /* clears xoff condition */
#define DIGI_TRANSMIT_NOT_IDLE 0
#define DIGI_TRANSMIT_IDLE 1
#define DIGI_DISABLE 0
#define DIGI_ENABLE 1
#define DIGI_DEASSERT 0
#define DIGI_ASSERT 1
/* in band status codes */
#define DIGI_OVERRUN_ERROR 4
#define DIGI_PARITY_ERROR 8
#define DIGI_FRAMING_ERROR 16
#define DIGI_BREAK_ERROR 32
/* out of band status */
#define DIGI_NO_ERROR 0
#define DIGI_BAD_FIRST_PARAMETER 1
#define DIGI_BAD_SECOND_PARAMETER 2
#define DIGI_INVALID_LINE 3
#define DIGI_INVALID_OPCODE 4
/* input signals */
#define DIGI_READ_INPUT_SIGNALS_SLOT 1
#define DIGI_READ_INPUT_SIGNALS_ERR 2
#define DIGI_READ_INPUT_SIGNALS_BUSY 4
#define DIGI_READ_INPUT_SIGNALS_PE 8
#define DIGI_READ_INPUT_SIGNALS_CTS 16
#define DIGI_READ_INPUT_SIGNALS_DSR 32
#define DIGI_READ_INPUT_SIGNALS_RI 64
#define DIGI_READ_INPUT_SIGNALS_DCD 128
/* Structures */
struct digi_serial {
spinlock_t ds_serial_lock;
struct usb_serial_port *ds_oob_port; /* out-of-band port */
int ds_oob_port_num; /* index of out-of-band port */
int ds_device_started;
};
struct digi_port {
spinlock_t dp_port_lock;
int dp_port_num;
int dp_out_buf_len;
unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE];
int dp_write_urb_in_use;
unsigned int dp_modem_signals;
wait_queue_head_t dp_modem_change_wait;
int dp_transmit_idle;
wait_queue_head_t dp_transmit_idle_wait;
int dp_throttled;
int dp_throttle_restart;
wait_queue_head_t dp_flush_wait;
wait_queue_head_t dp_close_wait; /* wait queue for close */
struct work_struct dp_wakeup_work;
struct usb_serial_port *dp_port;
};
/* Local Function Declarations */
static void digi_wakeup_write(struct usb_serial_port *port);
static void digi_wakeup_write_lock(struct work_struct *work);
static int digi_write_oob_command(struct usb_serial_port *port,
unsigned char *buf, int count, int interruptible);
static int digi_write_inb_command(struct usb_serial_port *port,
unsigned char *buf, int count, unsigned long timeout);
static int digi_set_modem_signals(struct usb_serial_port *port,
unsigned int modem_signals, int interruptible);
static int digi_transmit_idle(struct usb_serial_port *port,
unsigned long timeout);
static void digi_rx_throttle(struct tty_struct *tty);
static void digi_rx_unthrottle(struct tty_struct *tty);
static void digi_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios);
static void digi_break_ctl(struct tty_struct *tty, int break_state);
static int digi_tiocmget(struct tty_struct *tty);
static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
unsigned int clear);
static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
static void digi_write_bulk_callback(struct urb *urb);
static int digi_write_room(struct tty_struct *tty);
static int digi_chars_in_buffer(struct tty_struct *tty);
static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
static void digi_close(struct usb_serial_port *port);
static void digi_dtr_rts(struct usb_serial_port *port, int on);
static int digi_startup_device(struct usb_serial *serial);
static int digi_startup(struct usb_serial *serial);
static void digi_disconnect(struct usb_serial *serial);
static void digi_release(struct usb_serial *serial);
static int digi_port_probe(struct usb_serial_port *port);
static int digi_port_remove(struct usb_serial_port *port);
static void digi_read_bulk_callback(struct urb *urb);
static int digi_read_inb_callback(struct urb *urb);
static int digi_read_oob_callback(struct urb *urb);
static const struct usb_device_id id_table_combined[] = {
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
{ } /* Terminating entry */
};
static const struct usb_device_id id_table_2[] = {
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) },
{ } /* Terminating entry */
};
static const struct usb_device_id id_table_4[] = {
{ USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table_combined);
/* device info needed for the Digi serial converter */
static struct usb_serial_driver digi_acceleport_2_device = {
.driver = {
.owner = THIS_MODULE,
.name = "digi_2",
},
.description = "Digi 2 port USB adapter",
.id_table = id_table_2,
.num_ports = 3,
.open = digi_open,
.close = digi_close,
.dtr_rts = digi_dtr_rts,
.write = digi_write,
.write_room = digi_write_room,
.write_bulk_callback = digi_write_bulk_callback,
.read_bulk_callback = digi_read_bulk_callback,
.chars_in_buffer = digi_chars_in_buffer,
.throttle = digi_rx_throttle,
.unthrottle = digi_rx_unthrottle,
.set_termios = digi_set_termios,
.break_ctl = digi_break_ctl,
.tiocmget = digi_tiocmget,
.tiocmset = digi_tiocmset,
.attach = digi_startup,
.disconnect = digi_disconnect,
.release = digi_release,
.port_probe = digi_port_probe,
.port_remove = digi_port_remove,
};
static struct usb_serial_driver digi_acceleport_4_device = {
.driver = {
.owner = THIS_MODULE,
.name = "digi_4",
},
.description = "Digi 4 port USB adapter",
.id_table = id_table_4,
.num_ports = 4,
.open = digi_open,
.close = digi_close,
.write = digi_write,
.write_room = digi_write_room,
.write_bulk_callback = digi_write_bulk_callback,
.read_bulk_callback = digi_read_bulk_callback,
.chars_in_buffer = digi_chars_in_buffer,
.throttle = digi_rx_throttle,
.unthrottle = digi_rx_unthrottle,
.set_termios = digi_set_termios,
.break_ctl = digi_break_ctl,
.tiocmget = digi_tiocmget,
.tiocmset = digi_tiocmset,
.attach = digi_startup,
.disconnect = digi_disconnect,
.release = digi_release,
.port_probe = digi_port_probe,
.port_remove = digi_port_remove,
};
static struct usb_serial_driver * const serial_drivers[] = {
&digi_acceleport_2_device, &digi_acceleport_4_device, NULL
};
/* Functions */
/*
* Cond Wait Interruptible Timeout Irqrestore
*
* Do spin_unlock_irqrestore and interruptible_sleep_on_timeout
* so that wake ups are not lost if they occur between the unlock
* and the sleep. In other words, spin_unlock_irqrestore and
* interruptible_sleep_on_timeout are "atomic" with respect to
* wake ups. This is used to implement condition variables.
*
* interruptible_sleep_on_timeout is deprecated and has been replaced
* with the equivalent code.
*/
static long cond_wait_interruptible_timeout_irqrestore(
wait_queue_head_t *q, long timeout,
spinlock_t *lock, unsigned long flags)
__releases(lock)
{
DEFINE_WAIT(wait);
prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(lock, flags);
timeout = schedule_timeout(timeout);
finish_wait(q, &wait);
return timeout;
}
/*
* Digi Wakeup Write
*
* Wake up port, line discipline, and tty processes sleeping
* on writes.
*/
static void digi_wakeup_write_lock(struct work_struct *work)
{
struct digi_port *priv =
container_of(work, struct digi_port, dp_wakeup_work);
struct usb_serial_port *port = priv->dp_port;
unsigned long flags;
spin_lock_irqsave(&priv->dp_port_lock, flags);
digi_wakeup_write(port);
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
}
static void digi_wakeup_write(struct usb_serial_port *port)
{
struct tty_struct *tty = tty_port_tty_get(&port->port);
if (tty) {
tty_wakeup(tty);
tty_kref_put(tty);
}
}
/*
* Digi Write OOB Command
*
* Write commands on the out of band port. Commands are 4
* bytes each, multiple commands can be sent at once, and
* no command will be split across USB packets. Returns 0
* if successful, -EINTR if interrupted while sleeping and
* the interruptible flag is true, or a negative error
* returned by usb_submit_urb.
*/
static int digi_write_oob_command(struct usb_serial_port *port,
unsigned char *buf, int count, int interruptible)
{
int ret = 0;
int len;
struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
unsigned long flags = 0;
dev_dbg(&port->dev,
"digi_write_oob_command: TOP: port=%d, count=%d\n",
oob_priv->dp_port_num, count);
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
while (count > 0) {
while (oob_priv->dp_write_urb_in_use) {
cond_wait_interruptible_timeout_irqrestore(
&oob_port->write_wait, DIGI_RETRY_TIMEOUT,
&oob_priv->dp_port_lock, flags);
if (interruptible && signal_pending(current))
return -EINTR;
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
}
/* len must be a multiple of 4, so commands are not split */
len = min(count, oob_port->bulk_out_size);
if (len > 4)
len &= ~3;
memcpy(oob_port->write_urb->transfer_buffer, buf, len);
oob_port->write_urb->transfer_buffer_length = len;
ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
if (ret == 0) {
oob_priv->dp_write_urb_in_use = 1;
count -= len;
buf += len;
}
}
spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
if (ret)
dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
__func__, ret);
return ret;
}
/*
* Digi Write In Band Command
*
* Write commands on the given port. Commands are 4
* bytes each, multiple commands can be sent at once, and
* no command will be split across USB packets. If timeout
* is non-zero, write in band command will return after
* waiting unsuccessfully for the URB status to clear for
* timeout ticks. Returns 0 if successful, or a negative
* error returned by digi_write.
*/
static int digi_write_inb_command(struct usb_serial_port *port,
unsigned char *buf, int count, unsigned long timeout)
{
int ret = 0;
int len;
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned char *data = port->write_urb->transfer_buffer;
unsigned long flags = 0;
dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n",
priv->dp_port_num, count);
if (timeout)
timeout += jiffies;
else
timeout = ULONG_MAX;
spin_lock_irqsave(&priv->dp_port_lock, flags);
while (count > 0 && ret == 0) {
while (priv->dp_write_urb_in_use &&
time_before(jiffies, timeout)) {
cond_wait_interruptible_timeout_irqrestore(
&port->write_wait, DIGI_RETRY_TIMEOUT,
&priv->dp_port_lock, flags);
if (signal_pending(current))
return -EINTR;
spin_lock_irqsave(&priv->dp_port_lock, flags);
}
/* len must be a multiple of 4 and small enough to */
/* guarantee the write will send buffered data first, */
/* so commands are in order with data and not split */
len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
if (len > 4)
len &= ~3;
/* write any buffered data first */
if (priv->dp_out_buf_len > 0) {
data[0] = DIGI_CMD_SEND_DATA;
data[1] = priv->dp_out_buf_len;
memcpy(data + 2, priv->dp_out_buf,
priv->dp_out_buf_len);
memcpy(data + 2 + priv->dp_out_buf_len, buf, len);
port->write_urb->transfer_buffer_length
= priv->dp_out_buf_len + 2 + len;
} else {
memcpy(data, buf, len);
port->write_urb->transfer_buffer_length = len;
}
ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (ret == 0) {
priv->dp_write_urb_in_use = 1;
priv->dp_out_buf_len = 0;
count -= len;
buf += len;
}
}
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
if (ret)
dev_err(&port->dev,
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
__func__, ret, priv->dp_port_num);
return ret;
}
/*
* Digi Set Modem Signals
*
* Sets or clears DTR and RTS on the port, according to the
* modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags
* for the modem_signals argument. Returns 0 if successful,
* -EINTR if interrupted while sleeping, or a non-zero error
* returned by usb_submit_urb.
*/
static int digi_set_modem_signals(struct usb_serial_port *port,
unsigned int modem_signals, int interruptible)
{
int ret;
struct digi_port *port_priv = usb_get_serial_port_data(port);
struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port;
struct digi_port *oob_priv = usb_get_serial_port_data(oob_port);
unsigned char *data = oob_port->write_urb->transfer_buffer;
unsigned long flags = 0;
dev_dbg(&port->dev,
"digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n",
port_priv->dp_port_num, modem_signals);
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
spin_lock(&port_priv->dp_port_lock);
while (oob_priv->dp_write_urb_in_use) {
spin_unlock(&port_priv->dp_port_lock);
cond_wait_interruptible_timeout_irqrestore(
&oob_port->write_wait, DIGI_RETRY_TIMEOUT,
&oob_priv->dp_port_lock, flags);
if (interruptible && signal_pending(current))
return -EINTR;
spin_lock_irqsave(&oob_priv->dp_port_lock, flags);
spin_lock(&port_priv->dp_port_lock);
}
data[0] = DIGI_CMD_SET_DTR_SIGNAL;
data[1] = port_priv->dp_port_num;
data[2] = (modem_signals & TIOCM_DTR) ?
DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE;
data[3] = 0;
data[4] = DIGI_CMD_SET_RTS_SIGNAL;
data[5] = port_priv->dp_port_num;
data[6] = (modem_signals & TIOCM_RTS) ?
DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE;
data[7] = 0;
oob_port->write_urb->transfer_buffer_length = 8;
ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC);
if (ret == 0) {
oob_priv->dp_write_urb_in_use = 1;
port_priv->dp_modem_signals =
(port_priv->dp_modem_signals&~(TIOCM_DTR|TIOCM_RTS))
| (modem_signals&(TIOCM_DTR|TIOCM_RTS));
}
spin_unlock(&port_priv->dp_port_lock);
spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags);
if (ret)
dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n",
__func__, ret);
return ret;
}
/*
* Digi Transmit Idle
*
* Digi transmit idle waits, up to timeout ticks, for the transmitter
* to go idle. It returns 0 if successful or a negative error.
*
* There are race conditions here if more than one process is calling
* digi_transmit_idle on the same port at the same time. However, this
* is only called from close, and only one process can be in close on a
* port at a time, so its ok.
*/
static int digi_transmit_idle(struct usb_serial_port *port,
unsigned long timeout)
{
int ret;
unsigned char buf[2];
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned long flags = 0;
spin_lock_irqsave(&priv->dp_port_lock, flags);
priv->dp_transmit_idle = 0;
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
buf[0] = DIGI_CMD_TRANSMIT_IDLE;
buf[1] = 0;
timeout += jiffies;
ret = digi_write_inb_command(port, buf, 2, timeout - jiffies);
if (ret != 0)
return ret;
spin_lock_irqsave(&priv->dp_port_lock, flags);
while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) {
cond_wait_interruptible_timeout_irqrestore(
&priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT,
&priv->dp_port_lock, flags);
if (signal_pending(current))
return -EINTR;
spin_lock_irqsave(&priv->dp_port_lock, flags);
}
priv->dp_transmit_idle = 0;
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
return 0;
}
static void digi_rx_throttle(struct tty_struct *tty)
{
unsigned long flags;
struct usb_serial_port *port = tty->driver_data;
struct digi_port *priv = usb_get_serial_port_data(port);
/* stop receiving characters by not resubmitting the read urb */
spin_lock_irqsave(&priv->dp_port_lock, flags);
priv->dp_throttled = 1;
priv->dp_throttle_restart = 0;
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
}
static void digi_rx_unthrottle(struct tty_struct *tty)
{
int ret = 0;
unsigned long flags;
struct usb_serial_port *port = tty->driver_data;
struct digi_port *priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&priv->dp_port_lock, flags);
/* restart read chain */
if (priv->dp_throttle_restart)
ret = usb_submit_urb(port->read_urb, GFP_ATOMIC);
/* turn throttle off */
priv->dp_throttled = 0;
priv->dp_throttle_restart = 0;
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
if (ret)
dev_err(&port->dev,
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
__func__, ret, priv->dp_port_num);
}
static void digi_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct digi_port *priv = usb_get_serial_port_data(port);
struct device *dev = &port->dev;
unsigned int iflag = tty->termios.c_iflag;
unsigned int cflag = tty->termios.c_cflag;
unsigned int old_iflag = old_termios->c_iflag;
unsigned int old_cflag = old_termios->c_cflag;
unsigned char buf[32];
unsigned int modem_signals;
int arg, ret;
int i = 0;
speed_t baud;
dev_dbg(dev,
"digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n",
priv->dp_port_num, iflag, old_iflag, cflag, old_cflag);
/* set baud rate */
baud = tty_get_baud_rate(tty);
if (baud != tty_termios_baud_rate(old_termios)) {
arg = -1;
/* reassert DTR and (maybe) RTS on transition from B0 */
if ((old_cflag&CBAUD) == B0) {
/* don't set RTS if using hardware flow control */
/* and throttling input */
modem_signals = TIOCM_DTR;
if (!(tty->termios.c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags))
modem_signals |= TIOCM_RTS;
digi_set_modem_signals(port, modem_signals, 1);
}
switch (baud) {
/* drop DTR and RTS on transition to B0 */
case 0: digi_set_modem_signals(port, 0, 1); break;
case 50: arg = DIGI_BAUD_50; break;
case 75: arg = DIGI_BAUD_75; break;
case 110: arg = DIGI_BAUD_110; break;
case 150: arg = DIGI_BAUD_150; break;
case 200: arg = DIGI_BAUD_200; break;
case 300: arg = DIGI_BAUD_300; break;
case 600: arg = DIGI_BAUD_600; break;
case 1200: arg = DIGI_BAUD_1200; break;
case 1800: arg = DIGI_BAUD_1800; break;
case 2400: arg = DIGI_BAUD_2400; break;
case 4800: arg = DIGI_BAUD_4800; break;
case 9600: arg = DIGI_BAUD_9600; break;
case 19200: arg = DIGI_BAUD_19200; break;
case 38400: arg = DIGI_BAUD_38400; break;
case 57600: arg = DIGI_BAUD_57600; break;
case 115200: arg = DIGI_BAUD_115200; break;
case 230400: arg = DIGI_BAUD_230400; break;
case 460800: arg = DIGI_BAUD_460800; break;
default:
arg = DIGI_BAUD_9600;
baud = 9600;
break;
}
if (arg != -1) {
buf[i++] = DIGI_CMD_SET_BAUD_RATE;
buf[i++] = priv->dp_port_num;
buf[i++] = arg;
buf[i++] = 0;
}
}
/* set parity */
tty->termios.c_cflag &= ~CMSPAR;
if ((cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD))) {
if (cflag&PARENB) {
if (cflag&PARODD)
arg = DIGI_PARITY_ODD;
else
arg = DIGI_PARITY_EVEN;
} else {
arg = DIGI_PARITY_NONE;
}
buf[i++] = DIGI_CMD_SET_PARITY;
buf[i++] = priv->dp_port_num;
buf[i++] = arg;
buf[i++] = 0;
}
/* set word size */
if ((cflag&CSIZE) != (old_cflag&CSIZE)) {
arg = -1;
switch (cflag&CSIZE) {
case CS5: arg = DIGI_WORD_SIZE_5; break;
case CS6: arg = DIGI_WORD_SIZE_6; break;
case CS7: arg = DIGI_WORD_SIZE_7; break;
case CS8: arg = DIGI_WORD_SIZE_8; break;
default:
dev_dbg(dev,
"digi_set_termios: can't handle word size %d\n",
(cflag&CSIZE));
break;
}
if (arg != -1) {
buf[i++] = DIGI_CMD_SET_WORD_SIZE;
buf[i++] = priv->dp_port_num;
buf[i++] = arg;
buf[i++] = 0;
}
}
/* set stop bits */
if ((cflag&CSTOPB) != (old_cflag&CSTOPB)) {
if ((cflag&CSTOPB))
arg = DIGI_STOP_BITS_2;
else
arg = DIGI_STOP_BITS_1;
buf[i++] = DIGI_CMD_SET_STOP_BITS;
buf[i++] = priv->dp_port_num;
buf[i++] = arg;
buf[i++] = 0;
}
/* set input flow control */
if ((iflag&IXOFF) != (old_iflag&IXOFF)
|| (cflag&CRTSCTS) != (old_cflag&CRTSCTS)) {
arg = 0;
if (iflag&IXOFF)
arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
else
arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF;
if (cflag&CRTSCTS) {
arg |= DIGI_INPUT_FLOW_CONTROL_RTS;
/* On USB-4 it is necessary to assert RTS prior */
/* to selecting RTS input flow control. */
buf[i++] = DIGI_CMD_SET_RTS_SIGNAL;
buf[i++] = priv->dp_port_num;
buf[i++] = DIGI_RTS_ACTIVE;
buf[i++] = 0;
} else {
arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS;
}
buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
buf[i++] = priv->dp_port_num;
buf[i++] = arg;
buf[i++] = 0;
}
/* set output flow control */
if ((iflag & IXON) != (old_iflag & IXON)
|| (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
arg = 0;
if (iflag & IXON)
arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
else
arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF;
if (cflag & CRTSCTS) {
arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS;
} else {
arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS;
tty->hw_stopped = 0;
}
buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
buf[i++] = priv->dp_port_num;
buf[i++] = arg;
buf[i++] = 0;
}
/* set receive enable/disable */
if ((cflag & CREAD) != (old_cflag & CREAD)) {
if (cflag & CREAD)
arg = DIGI_ENABLE;
else
arg = DIGI_DISABLE;
buf[i++] = DIGI_CMD_RECEIVE_ENABLE;
buf[i++] = priv->dp_port_num;
buf[i++] = arg;
buf[i++] = 0;
}
ret = digi_write_oob_command(port, buf, i, 1);
if (ret != 0)
dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret);
tty_encode_baud_rate(tty, baud, baud);
}
static void digi_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned char buf[4];
buf[0] = DIGI_CMD_BREAK_CONTROL;
buf[1] = 2; /* length */
buf[2] = break_state ? 1 : 0;
buf[3] = 0; /* pad */
digi_write_inb_command(port, buf, 4, 0);
}
static int digi_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned int val;
unsigned long flags;
spin_lock_irqsave(&priv->dp_port_lock, flags);
val = priv->dp_modem_signals;
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
return val;
}
static int digi_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned int val;
unsigned long flags;
spin_lock_irqsave(&priv->dp_port_lock, flags);
val = (priv->dp_modem_signals & ~clear) | set;
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
return digi_set_modem_signals(port, val, 1);
}
static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
int ret, data_len, new_len;
struct digi_port *priv = usb_get_serial_port_data(port);
unsigned char *data = port->write_urb->transfer_buffer;
unsigned long flags = 0;
dev_dbg(&port->dev,
"digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n",
priv->dp_port_num, count, in_interrupt());
/* copy user data (which can sleep) before getting spin lock */
count = min(count, port->bulk_out_size-2);
count = min(64, count);
/* be sure only one write proceeds at a time */
/* there are races on the port private buffer */
spin_lock_irqsave(&priv->dp_port_lock, flags);
/* wait for urb status clear to submit another urb */
if (priv->dp_write_urb_in_use) {
/* buffer data if count is 1 (probably put_char) if possible */
if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) {
priv->dp_out_buf[priv->dp_out_buf_len++] = *buf;
new_len = 1;
} else {
new_len = 0;
}
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
return new_len;
}
/* allow space for any buffered data and for new data, up to */
/* transfer buffer size - 2 (for command and length bytes) */
new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len);
data_len = new_len + priv->dp_out_buf_len;
if (data_len == 0) {
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
return 0;
}
port->write_urb->transfer_buffer_length = data_len+2;
*data++ = DIGI_CMD_SEND_DATA;
*data++ = data_len;
/* copy in buffered data first */
memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len);
data += priv->dp_out_buf_len;
/* copy in new data */
memcpy(data, buf, new_len);
ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (ret == 0) {
priv->dp_write_urb_in_use = 1;
ret = new_len;
priv->dp_out_buf_len = 0;
}
/* return length of new data written, or error */
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
if (ret < 0)
dev_err_console(port,
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
__func__, ret, priv->dp_port_num);
dev_dbg(&port->dev, "digi_write: returning %d\n", ret);
return ret;
}
static void digi_write_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct usb_serial *serial;
struct digi_port *priv;
struct digi_serial *serial_priv;
int ret = 0;
int status = urb->status;
/* port and serial sanity check */
if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {
pr_err("%s: port or port->private is NULL, status=%d\n",
__func__, status);
return;
}
serial = port->serial;
if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) {
dev_err(&port->dev,
"%s: serial or serial->private is NULL, status=%d\n",
__func__, status);
return;
}
/* handle oob callback */
if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n");
spin_lock(&priv->dp_port_lock);
priv->dp_write_urb_in_use = 0;
wake_up_interruptible(&port->write_wait);
spin_unlock(&priv->dp_port_lock);
return;
}
/* try to send any buffered data on this port */
spin_lock(&priv->dp_port_lock);
priv->dp_write_urb_in_use = 0;
if (priv->dp_out_buf_len > 0) {
*((unsigned char *)(port->write_urb->transfer_buffer))
= (unsigned char)DIGI_CMD_SEND_DATA;
*((unsigned char *)(port->write_urb->transfer_buffer) + 1)
= (unsigned char)priv->dp_out_buf_len;
port->write_urb->transfer_buffer_length =
priv->dp_out_buf_len + 2;
memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf,
priv->dp_out_buf_len);
ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (ret == 0) {
priv->dp_write_urb_in_use = 1;
priv->dp_out_buf_len = 0;
}
}
/* wake up processes sleeping on writes immediately */
digi_wakeup_write(port);
/* also queue up a wakeup at scheduler time, in case we */
/* lost the race in write_chan(). */
schedule_work(&priv->dp_wakeup_work);
spin_unlock(&priv->dp_port_lock);
if (ret && ret != -EPERM)
dev_err_console(port,
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
__func__, ret, priv->dp_port_num);
}
static int digi_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct digi_port *priv = usb_get_serial_port_data(port);
int room;
unsigned long flags = 0;
spin_lock_irqsave(&priv->dp_port_lock, flags);
if (priv->dp_write_urb_in_use)
room = 0;
else
room = port->bulk_out_size - 2 - priv->dp_out_buf_len;
spin_unlock_irqrestore(&priv->dp_port_lock, flags);
dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
return room;
}
static int digi_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct digi_port *priv = usb_get_serial_port_data(port);
if (priv->dp_write_urb_in_use) {
dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
priv->dp_port_num, port->bulk_out_size - 2);
/* return(port->bulk_out_size - 2); */
return 256;
} else {
dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n",
priv->dp_port_num, priv->dp_out_buf_len);
return priv->dp_out_buf_len;
}
}
static void digi_dtr_rts(struct usb_serial_port *port, int on)
{
/* Adjust DTR and RTS */
digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
}
static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
{
int ret;
unsigned char buf[32];
struct digi_port *priv = usb_get_serial_port_data(port);
struct ktermios not_termios;
/* be sure the device is started up */
if (digi_startup_device(port->serial) != 0)
return -ENXIO;
/* read modem signals automatically whenever they change */
buf[0] = DIGI_CMD_READ_INPUT_SIGNALS;
buf[1] = priv->dp_port_num;
buf[2] = DIGI_ENABLE;
buf[3] = 0;
/* flush fifos */
buf[4] = DIGI_CMD_IFLUSH_FIFO;
buf[5] = priv->dp_port_num;
buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
buf[7] = 0;
ret = digi_write_oob_command(port, buf, 8, 1);
if (ret != 0)
dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret);
/* set termios settings */
if (tty) {
not_termios.c_cflag = ~tty->termios.c_cflag;
not_termios.c_iflag = ~tty->termios.c_iflag;
digi_set_termios(tty, port, &not_termios);
}
return 0;
}
static void digi_close(struct usb_serial_port *port)
{
DEFINE_WAIT(wait);
int ret;
unsigned char buf[32];
struct digi_port *priv = usb_get_serial_port_data(port);
mutex_lock(&port->serial->disc_mutex);
/* if disconnected, just clear flags */
if (port->serial->disconnected)
goto exit;
if (port->serial->dev) {
/* FIXME: Transmit idle belongs in the wait_unti_sent path */
digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT);
/* disable input flow control */
buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL;
buf[1] = priv->dp_port_num;
buf[2] = DIGI_DISABLE;
buf[3] = 0;
/* disable output flow control */
buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL;
buf[5] = priv->dp_port_num;
buf[6] = DIGI_DISABLE;
buf[7] = 0;
/* disable reading modem signals automatically */
buf[8] = DIGI_CMD_READ_INPUT_SIGNALS;
buf[9] = priv->dp_port_num;
buf[10] = DIGI_DISABLE;
buf[11] = 0;
/* disable receive */
buf[12] = DIGI_CMD_RECEIVE_ENABLE;
buf[13] = priv->dp_port_num;
buf[14] = DIGI_DISABLE;
buf[15] = 0;
/* flush fifos */
buf[16] = DIGI_CMD_IFLUSH_FIFO;
buf[17] = priv->dp_port_num;
buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX;
buf[19] = 0;
ret = digi_write_oob_command(port, buf, 20, 0);
if (ret != 0)
dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n", ret);
/* wait for final commands on oob port to complete */
prepare_to_wait(&priv->dp_flush_wait, &wait,
TASK_INTERRUPTIBLE);
schedule_timeout(DIGI_CLOSE_TIMEOUT);
finish_wait(&priv->dp_flush_wait, &wait);
/* shutdown any outstanding bulk writes */
usb_kill_urb(port->write_urb);
}
exit:
spin_lock_irq(&priv->dp_port_lock);
priv->dp_write_urb_in_use = 0;
wake_up_interruptible(&priv->dp_close_wait);
spin_unlock_irq(&priv->dp_port_lock);
mutex_unlock(&port->serial->disc_mutex);
}
/*
* 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];
ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (ret != 0) {
dev_err(&port->dev,
"%s: usb_submit_urb failed, ret=%d, port=%d\n",
__func__, ret, i);
break;
}
}
return ret;
}
static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
{
struct digi_port *priv;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->dp_port_lock);
priv->dp_port_num = port_num;
init_waitqueue_head(&priv->dp_modem_change_wait);
init_waitqueue_head(&priv->dp_transmit_idle_wait);
init_waitqueue_head(&priv->dp_flush_wait);
init_waitqueue_head(&priv->dp_close_wait);
INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
priv->dp_port = port;
init_waitqueue_head(&port->write_wait);
usb_set_serial_port_data(port, priv);
return 0;
}
static int digi_startup(struct usb_serial *serial)
{
struct digi_serial *serial_priv;
int ret;
serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
if (!serial_priv)
return -ENOMEM;
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];
ret = digi_port_init(serial_priv->ds_oob_port,
serial_priv->ds_oob_port_num);
if (ret) {
kfree(serial_priv);
return ret;
}
usb_set_serial_data(serial, serial_priv);
return 0;
}
static void digi_disconnect(struct usb_serial *serial)
{
int i;
/* stop reads and writes on all ports */
for (i = 0; i < serial->type->num_ports + 1; i++) {
usb_kill_urb(serial->port[i]->read_urb);
usb_kill_urb(serial->port[i]->write_urb);
}
}
static void digi_release(struct usb_serial *serial)
{
struct digi_serial *serial_priv;
struct digi_port *priv;
serial_priv = usb_get_serial_data(serial);
priv = usb_get_serial_port_data(serial_priv->ds_oob_port);
kfree(priv);
kfree(serial_priv);
}
static int digi_port_probe(struct usb_serial_port *port)
{
unsigned port_num;
port_num = port->number - port->serial->minor;
return digi_port_init(port, port_num);
}
static int digi_port_remove(struct usb_serial_port *port)
{
struct digi_port *priv;
priv = usb_get_serial_port_data(port);
kfree(priv);
return 0;
}
static void digi_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct digi_port *priv;
struct digi_serial *serial_priv;
int ret;
int status = urb->status;
/* port sanity check, do not resubmit if port is not valid */
if (port == NULL)
return;
priv = usb_get_serial_port_data(port);
if (priv == NULL) {
dev_err(&port->dev, "%s: port->private is NULL, status=%d\n",
__func__, status);
return;
}
if (port->serial == NULL ||
(serial_priv = usb_get_serial_data(port->serial)) == NULL) {
dev_err(&port->dev, "%s: serial is bad or serial->private "
"is NULL, status=%d\n", __func__, status);
return;
}
/* do not resubmit urb if it has any status error */
if (status) {
dev_err(&port->dev,
"%s: nonzero read bulk status: status=%d, port=%d\n",
__func__, status, priv->dp_port_num);
return;
}
/* handle oob or inb callback, do not resubmit if error */
if (priv->dp_port_num == serial_priv->ds_oob_port_num) {
if (digi_read_oob_callback(urb) != 0)
return;
} else {
if (digi_read_inb_callback(urb) != 0)
return;
}
/* continue read */
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret != 0 && ret != -EPERM) {
dev_err(&port->dev,
"%s: failed resubmitting urb, ret=%d, port=%d\n",
__func__, ret, priv->dp_port_num);
}
}
/*
* Digi Read INB Callback
*
* Digi Read INB Callback handles reads on the in band ports, sending
* the data on to the tty subsystem. When called we know port and
* port->private are not NULL and port->serial has been validated.
* It returns 0 if successful, 1 if successful but the port is
* throttled, and -1 if the sanity checks failed.
*/
static int digi_read_inb_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct digi_port *priv = usb_get_serial_port_data(port);
int opcode = ((unsigned char *)urb->transfer_buffer)[0];
int len = ((unsigned char *)urb->transfer_buffer)[1];
int port_status = ((unsigned char *)urb->transfer_buffer)[2];
unsigned char *data = ((unsigned char *)urb->transfer_buffer) + 3;
int flag, throttled;
int status = urb->status;
/* do not process callbacks on closed ports */
/* but do continue the read chain */
if (urb->status == -ENOENT)
return 0;
/* short/multiple packet check */
if (urb->actual_length != len + 2) {
dev_err(&port->dev, "%s: INCOMPLETE OR MULTIPLE PACKET, "
"status=%d, port=%d, opcode=%d, len=%d, "
"actual_length=%d, status=%d\n", __func__, status,
priv->dp_port_num, opcode, len, urb->actual_length,
port_status);
return -1;
}
spin_lock(&priv->dp_port_lock);
/* check for throttle; if set, do not resubmit read urb */
/* indicate the read chain needs to be restarted on unthrottle */
throttled = priv->dp_throttled;
if (throttled)
priv->dp_throttle_restart = 1;
/* receive data */
if (opcode == DIGI_CMD_RECEIVE_DATA) {
/* get flag from port_status */
flag = 0;
/* overrun is special, not associated with a char */
if (port_status & DIGI_OVERRUN_ERROR)
tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
/* break takes precedence over parity, */
/* which takes precedence over framing errors */
if (port_status & DIGI_BREAK_ERROR)
flag = TTY_BREAK;
else if (port_status & DIGI_PARITY_ERROR)
flag = TTY_PARITY;
else if (port_status & DIGI_FRAMING_ERROR)
flag = TTY_FRAME;
/* data length is len-1 (one byte of len is port_status) */
--len;
if (len > 0) {
tty_insert_flip_string_fixed_flag(&port->port, data,
flag, len);
tty_flip_buffer_push(&port->port);
}
}
spin_unlock(&priv->dp_port_lock);
if (opcode == DIGI_CMD_RECEIVE_DISABLE)
dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__);
else if (opcode != DIGI_CMD_RECEIVE_DATA)
dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode);
return throttled ? 1 : 0;
}
/*
* Digi Read OOB Callback
*
* Digi Read OOB Callback handles reads on the out of band port.
* When called we know port and port->private are not NULL and
* the port->serial is valid. It returns 0 if successful, and
* -1 if the sanity checks failed.
*/
static int digi_read_oob_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct usb_serial *serial = port->serial;
struct tty_struct *tty;
struct digi_port *priv = usb_get_serial_port_data(port);
int opcode, line, status, val;
int i;
unsigned int rts;
/* 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++];
dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n",
opcode, line, status, val);
if (status != 0 || line >= serial->type->num_ports)
continue;
port = serial->port[line];
priv = usb_get_serial_port_data(port);
if (priv == NULL)
return -1;
tty = tty_port_tty_get(&port->port);
rts = 0;
if (tty)
rts = tty->termios.c_cflag & CRTSCTS;
if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
spin_lock(&priv->dp_port_lock);
/* convert from digi flags to termiox flags */
if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
priv->dp_modem_signals |= TIOCM_CTS;
/* port must be open to use tty struct */
if (rts) {
tty->hw_stopped = 0;
digi_wakeup_write(port);
}
} else {
priv->dp_modem_signals &= ~TIOCM_CTS;
/* port must be open to use tty struct */
if (rts)
tty->hw_stopped = 1;
}
if (val & DIGI_READ_INPUT_SIGNALS_DSR)
priv->dp_modem_signals |= TIOCM_DSR;
else
priv->dp_modem_signals &= ~TIOCM_DSR;
if (val & DIGI_READ_INPUT_SIGNALS_RI)
priv->dp_modem_signals |= TIOCM_RI;
else
priv->dp_modem_signals &= ~TIOCM_RI;
if (val & DIGI_READ_INPUT_SIGNALS_DCD)
priv->dp_modem_signals |= TIOCM_CD;
else
priv->dp_modem_signals &= ~TIOCM_CD;
wake_up_interruptible(&priv->dp_modem_change_wait);
spin_unlock(&priv->dp_port_lock);
} else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
spin_lock(&priv->dp_port_lock);
priv->dp_transmit_idle = 1;
wake_up_interruptible(&priv->dp_transmit_idle_wait);
spin_unlock(&priv->dp_port_lock);
} else if (opcode == DIGI_CMD_IFLUSH_FIFO) {
wake_up_interruptible(&priv->dp_flush_wait);
}
tty_kref_put(tty);
}
return 0;
}
module_usb_serial_driver(serial_drivers, id_table_combined);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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