// SPDX-License-Identifier: GPL-2.0+
/*
* USB ConnectTech WhiteHEAT driver
*
* Copyright (C) 2002
* Connect Tech Inc.
*
* Copyright (C) 1999 - 2001
* Greg Kroah-Hartman ([email protected])
*
* See Documentation/usb/usb-serial.rst for more information on using this
* driver
*/
#include <linux/kernel.h>
#include <linux/errno.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/mutex.h>
#include <linux/uaccess.h>
#include <asm/termbits.h>
#include <linux/usb.h>
#include <linux/serial_reg.h>
#include <linux/serial.h>
#include <linux/usb/serial.h>
#include <linux/usb/ezusb.h>
#include "whiteheat.h" /* WhiteHEAT specific commands */
/*
* Version Information
*/
#define DRIVER_AUTHOR "Greg Kroah-Hartman <[email protected]>, Stuart MacDonald <[email protected]>"
#define DRIVER_DESC "USB ConnectTech WhiteHEAT driver"
#define CONNECT_TECH_VENDOR_ID 0x0710
#define CONNECT_TECH_FAKE_WHITE_HEAT_ID 0x0001
#define CONNECT_TECH_WHITE_HEAT_ID 0x8001
/*
ID tables for whiteheat are unusual, because we want to different
things for different versions of the device. Eventually, this
will be doable from a single table. But, for now, we define two
separate ID tables, and then a third table that combines them
just for the purpose of exporting the autoloading information.
*/
static const struct usb_device_id id_table_std[] = {
{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
{ } /* Terminating entry */
};
static const struct usb_device_id id_table_prerenumeration[] = {
{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
{ } /* Terminating entry */
};
static const struct usb_device_id id_table_combined[] = {
{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table_combined);
/* function prototypes for the Connect Tech WhiteHEAT prerenumeration device */
static int whiteheat_firmware_download(struct usb_serial *serial,
const struct usb_device_id *id);
static int whiteheat_firmware_attach(struct usb_serial *serial);
/* function prototypes for the Connect Tech WhiteHEAT serial converter */
static int whiteheat_attach(struct usb_serial *serial);
static void whiteheat_release(struct usb_serial *serial);
static int whiteheat_port_probe(struct usb_serial_port *port);
static void whiteheat_port_remove(struct usb_serial_port *port);
static int whiteheat_open(struct tty_struct *tty,
struct usb_serial_port *port);
static void whiteheat_close(struct usb_serial_port *port);
static void whiteheat_get_serial(struct tty_struct *tty,
struct serial_struct *ss);
static void whiteheat_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
static int whiteheat_tiocmget(struct tty_struct *tty);
static int whiteheat_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static int whiteheat_break_ctl(struct tty_struct *tty, int break_state);
static struct usb_serial_driver whiteheat_fake_device = {
.driver = {
.name = "whiteheatnofirm",
},
.description = "Connect Tech - WhiteHEAT - (prerenumeration)",
.id_table = id_table_prerenumeration,
.num_ports = 1,
.probe = whiteheat_firmware_download,
.attach = whiteheat_firmware_attach,
};
static struct usb_serial_driver whiteheat_device = {
.driver = {
.name = "whiteheat",
},
.description = "Connect Tech - WhiteHEAT",
.id_table = id_table_std,
.num_ports = 4,
.num_bulk_in = 5,
.num_bulk_out = 5,
.attach = whiteheat_attach,
.release = whiteheat_release,
.port_probe = whiteheat_port_probe,
.port_remove = whiteheat_port_remove,
.open = whiteheat_open,
.close = whiteheat_close,
.get_serial = whiteheat_get_serial,
.set_termios = whiteheat_set_termios,
.break_ctl = whiteheat_break_ctl,
.tiocmget = whiteheat_tiocmget,
.tiocmset = whiteheat_tiocmset,
.throttle = usb_serial_generic_throttle,
.unthrottle = usb_serial_generic_unthrottle,
};
static struct usb_serial_driver * const serial_drivers[] = {
&whiteheat_fake_device, &whiteheat_device, NULL
};
struct whiteheat_command_private {
struct mutex mutex;
__u8 port_running;
__u8 command_finished;
wait_queue_head_t wait_command; /* for handling sleeping whilst
waiting for a command to
finish */
__u8 result_buffer[64];
};
struct whiteheat_private {
__u8 mcr; /* FIXME: no locking on mcr */
};
/* local function prototypes */
static int start_command_port(struct usb_serial *serial);
static void stop_command_port(struct usb_serial *serial);
static void command_port_write_callback(struct urb *urb);
static void command_port_read_callback(struct urb *urb);
static int firm_send_command(struct usb_serial_port *port, __u8 command,
__u8 *data, __u8 datasize);
static int firm_open(struct usb_serial_port *port);
static int firm_close(struct usb_serial_port *port);
static void firm_setup_port(struct tty_struct *tty);
static int firm_set_rts(struct usb_serial_port *port, __u8 onoff);
static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff);
static int firm_set_break(struct usb_serial_port *port, __u8 onoff);
static int firm_purge(struct usb_serial_port *port, __u8 rxtx);
static int firm_get_dtr_rts(struct usb_serial_port *port);
static int firm_report_tx_done(struct usb_serial_port *port);
#define COMMAND_PORT 4
#define COMMAND_TIMEOUT (2*HZ) /* 2 second timeout for a command */
#define COMMAND_TIMEOUT_MS 2000
/*****************************************************************************
* Connect Tech's White Heat prerenumeration driver functions
*****************************************************************************/
/* steps to download the firmware to the WhiteHEAT device:
- hold the reset (by writing to the reset bit of the CPUCS register)
- download the VEND_AX.HEX file to the chip using VENDOR_REQUEST-ANCHOR_LOAD
- release the reset (by writing to the CPUCS register)
- download the WH.HEX file for all addresses greater than 0x1b3f using
VENDOR_REQUEST-ANCHOR_EXTERNAL_RAM_LOAD
- hold the reset
- download the WH.HEX file for all addresses less than 0x1b40 using
VENDOR_REQUEST_ANCHOR_LOAD
- release the reset
- device renumerated itself and comes up as new device id with all
firmware download completed.
*/
static int whiteheat_firmware_download(struct usb_serial *serial,
const struct usb_device_id *id)
{
int response;
response = ezusb_fx1_ihex_firmware_download(serial->dev, "whiteheat_loader.fw");
if (response >= 0) {
response = ezusb_fx1_ihex_firmware_download(serial->dev, "whiteheat.fw");
if (response >= 0)
return 0;
}
return -ENOENT;
}
static int whiteheat_firmware_attach(struct usb_serial *serial)
{
/* We want this device to fail to have a driver assigned to it */
return 1;
}
/*****************************************************************************
* Connect Tech's White Heat serial driver functions
*****************************************************************************/
static int whiteheat_attach(struct usb_serial *serial)
{
struct usb_serial_port *command_port;
struct whiteheat_command_private *command_info;
struct whiteheat_hw_info *hw_info;
int pipe;
int ret;
int alen;
__u8 *command;
__u8 *result;
command_port = serial->port[COMMAND_PORT];
pipe = usb_sndbulkpipe(serial->dev,
command_port->bulk_out_endpointAddress);
command = kmalloc(2, GFP_KERNEL);
if (!command)
goto no_command_buffer;
command[0] = WHITEHEAT_GET_HW_INFO;
command[1] = 0;
result = kmalloc(sizeof(*hw_info) + 1, GFP_KERNEL);
if (!result)
goto no_result_buffer;
/*
* When the module is reloaded the firmware is still there and
* the endpoints are still in the usb core unchanged. This is the
* unlinking bug in disguise. Same for the call below.
*/
usb_clear_halt(serial->dev, pipe);
ret = usb_bulk_msg(serial->dev, pipe, command, 2,
&alen, COMMAND_TIMEOUT_MS);
if (ret) {
dev_err(&serial->dev->dev, "%s: Couldn't send command [%d]\n",
serial->type->description, ret);
goto no_firmware;
} else if (alen != 2) {
dev_err(&serial->dev->dev, "%s: Send command incomplete [%d]\n",
serial->type->description, alen);
goto no_firmware;
}
pipe = usb_rcvbulkpipe(serial->dev,
command_port->bulk_in_endpointAddress);
/* See the comment on the usb_clear_halt() above */
usb_clear_halt(serial->dev, pipe);
ret = usb_bulk_msg(serial->dev, pipe, result,
sizeof(*hw_info) + 1, &alen, COMMAND_TIMEOUT_MS);
if (ret) {
dev_err(&serial->dev->dev, "%s: Couldn't get results [%d]\n",
serial->type->description, ret);
goto no_firmware;
} else if (alen != sizeof(*hw_info) + 1) {
dev_err(&serial->dev->dev, "%s: Get results incomplete [%d]\n",
serial->type->description, alen);
goto no_firmware;
} else if (result[0] != command[0]) {
dev_err(&serial->dev->dev, "%s: Command failed [%d]\n",
serial->type->description, result[0]);
goto no_firmware;
}
hw_info = (struct whiteheat_hw_info *)&result[1];
dev_info(&serial->dev->dev, "%s: Firmware v%d.%02d\n",
serial->type->description,
hw_info->sw_major_rev, hw_info->sw_minor_rev);
command_info = kmalloc(sizeof(struct whiteheat_command_private),
GFP_KERNEL);
if (!command_info)
goto no_command_private;
mutex_init(&command_info->mutex);
command_info->port_running = 0;
init_waitqueue_head(&command_info->wait_command);
usb_set_serial_port_data(command_port, command_info);
command_port->write_urb->complete = command_port_write_callback;
command_port->read_urb->complete = command_port_read_callback;
kfree(result);
kfree(command);
return 0;
no_firmware:
/* Firmware likely not running */
dev_err(&serial->dev->dev,
"%s: Unable to retrieve firmware version, try replugging\n",
serial->type->description);
dev_err(&serial->dev->dev,
"%s: If the firmware is not running (status led not blinking)\n",
serial->type->description);
dev_err(&serial->dev->dev,
"%s: please contact [email protected]\n",
serial->type->description);
kfree(result);
kfree(command);
return -ENODEV;
no_command_private:
kfree(result);
no_result_buffer:
kfree(command);
no_command_buffer:
return -ENOMEM;
}
static void whiteheat_release(struct usb_serial *serial)
{
struct usb_serial_port *command_port;
/* free up our private data for our command port */
command_port = serial->port[COMMAND_PORT];
kfree(usb_get_serial_port_data(command_port));
}
static int whiteheat_port_probe(struct usb_serial_port *port)
{
struct whiteheat_private *info;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
usb_set_serial_port_data(port, info);
return 0;
}
static void whiteheat_port_remove(struct usb_serial_port *port)
{
struct whiteheat_private *info;
info = usb_get_serial_port_data(port);
kfree(info);
}
static int whiteheat_open(struct tty_struct *tty, struct usb_serial_port *port)
{
int retval;
retval = start_command_port(port->serial);
if (retval)
goto exit;
/* send an open port command */
retval = firm_open(port);
if (retval) {
stop_command_port(port->serial);
goto exit;
}
retval = firm_purge(port, WHITEHEAT_PURGE_RX | WHITEHEAT_PURGE_TX);
if (retval) {
firm_close(port);
stop_command_port(port->serial);
goto exit;
}
if (tty)
firm_setup_port(tty);
/* Work around HCD bugs */
usb_clear_halt(port->serial->dev, port->read_urb->pipe);
usb_clear_halt(port->serial->dev, port->write_urb->pipe);
retval = usb_serial_generic_open(tty, port);
if (retval) {
firm_close(port);
stop_command_port(port->serial);
goto exit;
}
exit:
return retval;
}
static void whiteheat_close(struct usb_serial_port *port)
{
firm_report_tx_done(port);
firm_close(port);
usb_serial_generic_close(port);
stop_command_port(port->serial);
}
static int whiteheat_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct whiteheat_private *info = usb_get_serial_port_data(port);
unsigned int modem_signals = 0;
firm_get_dtr_rts(port);
if (info->mcr & UART_MCR_DTR)
modem_signals |= TIOCM_DTR;
if (info->mcr & UART_MCR_RTS)
modem_signals |= TIOCM_RTS;
return modem_signals;
}
static int whiteheat_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct whiteheat_private *info = usb_get_serial_port_data(port);
if (set & TIOCM_RTS)
info->mcr |= UART_MCR_RTS;
if (set & TIOCM_DTR)
info->mcr |= UART_MCR_DTR;
if (clear & TIOCM_RTS)
info->mcr &= ~UART_MCR_RTS;
if (clear & TIOCM_DTR)
info->mcr &= ~UART_MCR_DTR;
firm_set_dtr(port, info->mcr & UART_MCR_DTR);
firm_set_rts(port, info->mcr & UART_MCR_RTS);
return 0;
}
static void whiteheat_get_serial(struct tty_struct *tty, struct serial_struct *ss)
{
ss->baud_base = 460800;
}
static void whiteheat_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios)
{
firm_setup_port(tty);
}
static int whiteheat_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
return firm_set_break(port, break_state);
}
/*****************************************************************************
* Connect Tech's White Heat callback routines
*****************************************************************************/
static void command_port_write_callback(struct urb *urb)
{
int status = urb->status;
if (status) {
dev_dbg(&urb->dev->dev, "nonzero urb status: %d\n", status);
return;
}
}
static void command_port_read_callback(struct urb *urb)
{
struct usb_serial_port *command_port = urb->context;
struct whiteheat_command_private *command_info;
int status = urb->status;
unsigned char *data = urb->transfer_buffer;
int result;
command_info = usb_get_serial_port_data(command_port);
if (!command_info) {
dev_dbg(&urb->dev->dev, "%s - command_info is NULL, exiting.\n", __func__);
return;
}
if (!urb->actual_length) {
dev_dbg(&urb->dev->dev, "%s - empty response, exiting.\n", __func__);
return;
}
if (status) {
dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n", __func__, status);
if (status != -ENOENT)
command_info->command_finished = WHITEHEAT_CMD_FAILURE;
wake_up(&command_info->wait_command);
return;
}
usb_serial_debug_data(&command_port->dev, __func__, urb->actual_length, data);
if (data[0] == WHITEHEAT_CMD_COMPLETE) {
command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
wake_up(&command_info->wait_command);
} else if (data[0] == WHITEHEAT_CMD_FAILURE) {
command_info->command_finished = WHITEHEAT_CMD_FAILURE;
wake_up(&command_info->wait_command);
} else if (data[0] == WHITEHEAT_EVENT) {
/* These are unsolicited reports from the firmware, hence no
waiting command to wakeup */
dev_dbg(&urb->dev->dev, "%s - event received\n", __func__);
} else if ((data[0] == WHITEHEAT_GET_DTR_RTS) &&
(urb->actual_length - 1 <= sizeof(command_info->result_buffer))) {
memcpy(command_info->result_buffer, &data[1],
urb->actual_length - 1);
command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
wake_up(&command_info->wait_command);
} else
dev_dbg(&urb->dev->dev, "%s - bad reply from firmware\n", __func__);
/* Continue trying to always read */
result = usb_submit_urb(command_port->read_urb, GFP_ATOMIC);
if (result)
dev_dbg(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n",
__func__, result);
}
/*****************************************************************************
* Connect Tech's White Heat firmware interface
*****************************************************************************/
static int firm_send_command(struct usb_serial_port *port, __u8 command,
__u8 *data, __u8 datasize)
{
struct usb_serial_port *command_port;
struct whiteheat_command_private *command_info;
struct whiteheat_private *info;
struct device *dev = &port->dev;
__u8 *transfer_buffer;
int retval = 0;
int t;
dev_dbg(dev, "%s - command %d\n", __func__, command);
command_port = port->serial->port[COMMAND_PORT];
command_info = usb_get_serial_port_data(command_port);
if (command_port->bulk_out_size < datasize + 1)
return -EIO;
mutex_lock(&command_info->mutex);
command_info->command_finished = false;
transfer_buffer = (__u8 *)command_port->write_urb->transfer_buffer;
transfer_buffer[0] = command;
memcpy(&transfer_buffer[1], data, datasize);
command_port->write_urb->transfer_buffer_length = datasize + 1;
retval = usb_submit_urb(command_port->write_urb, GFP_NOIO);
if (retval) {
dev_dbg(dev, "%s - submit urb failed\n", __func__);
goto exit;
}
/* wait for the command to complete */
t = wait_event_timeout(command_info->wait_command,
(bool)command_info->command_finished, COMMAND_TIMEOUT);
if (!t)
usb_kill_urb(command_port->write_urb);
if (command_info->command_finished == false) {
dev_dbg(dev, "%s - command timed out.\n", __func__);
retval = -ETIMEDOUT;
goto exit;
}
if (command_info->command_finished == WHITEHEAT_CMD_FAILURE) {
dev_dbg(dev, "%s - command failed.\n", __func__);
retval = -EIO;
goto exit;
}
if (command_info->command_finished == WHITEHEAT_CMD_COMPLETE) {
dev_dbg(dev, "%s - command completed.\n", __func__);
switch (command) {
case WHITEHEAT_GET_DTR_RTS:
info = usb_get_serial_port_data(port);
info->mcr = command_info->result_buffer[0];
break;
}
}
exit:
mutex_unlock(&command_info->mutex);
return retval;
}
static int firm_open(struct usb_serial_port *port)
{
struct whiteheat_simple open_command;
open_command.port = port->port_number + 1;
return firm_send_command(port, WHITEHEAT_OPEN,
(__u8 *)&open_command, sizeof(open_command));
}
static int firm_close(struct usb_serial_port *port)
{
struct whiteheat_simple close_command;
close_command.port = port->port_number + 1;
return firm_send_command(port, WHITEHEAT_CLOSE,
(__u8 *)&close_command, sizeof(close_command));
}
static void firm_setup_port(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct device *dev = &port->dev;
struct whiteheat_port_settings port_settings;
unsigned int cflag = tty->termios.c_cflag;
speed_t baud;
port_settings.port = port->port_number + 1;
port_settings.bits = tty_get_char_size(cflag);
dev_dbg(dev, "%s - data bits = %d\n", __func__, port_settings.bits);
/* determine the parity */
if (cflag & PARENB)
if (cflag & CMSPAR)
if (cflag & PARODD)
port_settings.parity = WHITEHEAT_PAR_MARK;
else
port_settings.parity = WHITEHEAT_PAR_SPACE;
else
if (cflag & PARODD)
port_settings.parity = WHITEHEAT_PAR_ODD;
else
port_settings.parity = WHITEHEAT_PAR_EVEN;
else
port_settings.parity = WHITEHEAT_PAR_NONE;
dev_dbg(dev, "%s - parity = %c\n", __func__, port_settings.parity);
/* figure out the stop bits requested */
if (cflag & CSTOPB)
port_settings.stop = 2;
else
port_settings.stop = 1;
dev_dbg(dev, "%s - stop bits = %d\n", __func__, port_settings.stop);
/* figure out the flow control settings */
if (cflag & CRTSCTS)
port_settings.hflow = (WHITEHEAT_HFLOW_CTS |
WHITEHEAT_HFLOW_RTS);
else
port_settings.hflow = WHITEHEAT_HFLOW_NONE;
dev_dbg(dev, "%s - hardware flow control = %s %s %s %s\n", __func__,
(port_settings.hflow & WHITEHEAT_HFLOW_CTS) ? "CTS" : "",
(port_settings.hflow & WHITEHEAT_HFLOW_RTS) ? "RTS" : "",
(port_settings.hflow & WHITEHEAT_HFLOW_DSR) ? "DSR" : "",
(port_settings.hflow & WHITEHEAT_HFLOW_DTR) ? "DTR" : "");
/* determine software flow control */
if (I_IXOFF(tty))
port_settings.sflow = WHITEHEAT_SFLOW_RXTX;
else
port_settings.sflow = WHITEHEAT_SFLOW_NONE;
dev_dbg(dev, "%s - software flow control = %c\n", __func__, port_settings.sflow);
port_settings.xon = START_CHAR(tty);
port_settings.xoff = STOP_CHAR(tty);
dev_dbg(dev, "%s - XON = %2x, XOFF = %2x\n", __func__, port_settings.xon, port_settings.xoff);
/* get the baud rate wanted */
baud = tty_get_baud_rate(tty);
port_settings.baud = cpu_to_le32(baud);
dev_dbg(dev, "%s - baud rate = %u\n", __func__, baud);
/* fixme: should set validated settings */
tty_encode_baud_rate(tty, baud, baud);
/* handle any settings that aren't specified in the tty structure */
port_settings.lloop = 0;
/* now send the message to the device */
firm_send_command(port, WHITEHEAT_SETUP_PORT,
(__u8 *)&port_settings, sizeof(port_settings));
}
static int firm_set_rts(struct usb_serial_port *port, __u8 onoff)
{
struct whiteheat_set_rdb rts_command;
rts_command.port = port->port_number + 1;
rts_command.state = onoff;
return firm_send_command(port, WHITEHEAT_SET_RTS,
(__u8 *)&rts_command, sizeof(rts_command));
}
static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff)
{
struct whiteheat_set_rdb dtr_command;
dtr_command.port = port->port_number + 1;
dtr_command.state = onoff;
return firm_send_command(port, WHITEHEAT_SET_DTR,
(__u8 *)&dtr_command, sizeof(dtr_command));
}
static int firm_set_break(struct usb_serial_port *port, __u8 onoff)
{
struct whiteheat_set_rdb break_command;
break_command.port = port->port_number + 1;
break_command.state = onoff;
return firm_send_command(port, WHITEHEAT_SET_BREAK,
(__u8 *)&break_command, sizeof(break_command));
}
static int firm_purge(struct usb_serial_port *port, __u8 rxtx)
{
struct whiteheat_purge purge_command;
purge_command.port = port->port_number + 1;
purge_command.what = rxtx;
return firm_send_command(port, WHITEHEAT_PURGE,
(__u8 *)&purge_command, sizeof(purge_command));
}
static int firm_get_dtr_rts(struct usb_serial_port *port)
{
struct whiteheat_simple get_dr_command;
get_dr_command.port = port->port_number + 1;
return firm_send_command(port, WHITEHEAT_GET_DTR_RTS,
(__u8 *)&get_dr_command, sizeof(get_dr_command));
}
static int firm_report_tx_done(struct usb_serial_port *port)
{
struct whiteheat_simple close_command;
close_command.port = port->port_number + 1;
return firm_send_command(port, WHITEHEAT_REPORT_TX_DONE,
(__u8 *)&close_command, sizeof(close_command));
}
/*****************************************************************************
* Connect Tech's White Heat utility functions
*****************************************************************************/
static int start_command_port(struct usb_serial *serial)
{
struct usb_serial_port *command_port;
struct whiteheat_command_private *command_info;
int retval = 0;
command_port = serial->port[COMMAND_PORT];
command_info = usb_get_serial_port_data(command_port);
mutex_lock(&command_info->mutex);
if (!command_info->port_running) {
/* Work around HCD bugs */
usb_clear_halt(serial->dev, command_port->read_urb->pipe);
retval = usb_submit_urb(command_port->read_urb, GFP_KERNEL);
if (retval) {
dev_err(&serial->dev->dev,
"%s - failed submitting read urb, error %d\n",
__func__, retval);
goto exit;
}
}
command_info->port_running++;
exit:
mutex_unlock(&command_info->mutex);
return retval;
}
static void stop_command_port(struct usb_serial *serial)
{
struct usb_serial_port *command_port;
struct whiteheat_command_private *command_info;
command_port = serial->port[COMMAND_PORT];
command_info = usb_get_serial_port_data(command_port);
mutex_lock(&command_info->mutex);
command_info->port_running--;
if (!command_info->port_running)
usb_kill_urb(command_port->read_urb);
mutex_unlock(&command_info->mutex);
}
module_usb_serial_driver(serial_drivers, id_table_combined);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("whiteheat.fw");
MODULE_FIRMWARE("whiteheat_loader.fw");
Codebase Browser
linux