whiteheat.c

linux2.4.20下的针对三星公司的s3c2410的usb模块驱动代码

static void whiteheat_close(struct usb_serial_port *port, struct file * filp)
{
	struct whiteheat_min_set	close_command;
	
	dbg("%s - port %d", __FUNCTION__, port->number);
	
	/* send a close command to the port */
	/* firmware uses 1 based port numbering */
	close_command.port = port->number - port->serial->minor + 1;
	whiteheat_send_cmd (port->serial, WHITEHEAT_CLOSE, (__u8 *)&close_command, sizeof(close_command));

	/* Need to change the control lines here */
	/* FIXME */
	
	/* shutdown our bulk reads and writes */
	usb_unlink_urb (port->write_urb);
	usb_unlink_urb (port->read_urb);
}


static int whiteheat_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
{
	dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);

	return -ENOIOCTLCMD;
}


static void whiteheat_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
	unsigned int cflag;
	struct whiteheat_port_settings port_settings;

	dbg("%s -port %d", __FUNCTION__, port->number);

	if ((!port->tty) || (!port->tty->termios)) {
		dbg("%s - no tty structures", __FUNCTION__);
		goto exit;
	}
	
	cflag = port->tty->termios->c_cflag;
	/* check that they really want us to change something */
	if (old_termios) {
		if ((cflag == old_termios->c_cflag) &&
		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
			dbg("%s - nothing to change...", __FUNCTION__);
			goto exit;
		}
	}

	/* set the port number */
	/* firmware uses 1 based port numbering */
	port_settings.port = port->number + 1;

	/* get the byte size */
	switch (cflag & CSIZE) {
		case CS5:	port_settings.bits = 5;   break;
		case CS6:	port_settings.bits = 6;   break;
		case CS7:	port_settings.bits = 7;   break;
		default:
		case CS8:	port_settings.bits = 8;   break;
	}
	dbg("%s - data bits = %d", __FUNCTION__, port_settings.bits);
	
	/* determine the parity */
	if (cflag & PARENB)
		if (cflag & PARODD)
			port_settings.parity = 'o';
		else
			port_settings.parity = 'e';
	else
		port_settings.parity = 'n';
	dbg("%s - parity = %c", __FUNCTION__, port_settings.parity);

	/* figure out the stop bits requested */
	if (cflag & CSTOPB)
		port_settings.stop = 2;
	else
		port_settings.stop = 1;
	dbg("%s - stop bits = %d", __FUNCTION__, port_settings.stop);

	
	/* figure out the flow control settings */
	if (cflag & CRTSCTS)
		port_settings.hflow = (WHITEHEAT_CTS_FLOW | WHITEHEAT_RTS_FLOW);
	else
		port_settings.hflow = 0;
	dbg("%s - hardware flow control = %s %s %s %s", __FUNCTION__,
	    (port_settings.hflow & WHITEHEAT_CTS_FLOW) ? "CTS" : "",
	    (port_settings.hflow & WHITEHEAT_RTS_FLOW) ? "RTS" : "",
	    (port_settings.hflow & WHITEHEAT_DSR_FLOW) ? "DSR" : "",
	    (port_settings.hflow & WHITEHEAT_DTR_FLOW) ? "DTR" : "");
	
	/* determine software flow control */
	if (I_IXOFF(port->tty))
		port_settings.sflow = 'b';
	else
		port_settings.sflow = 'n';
	dbg("%s - software flow control = %c", __FUNCTION__, port_settings.sflow);
	
	port_settings.xon = START_CHAR(port->tty);
	port_settings.xoff = STOP_CHAR(port->tty);
	dbg("%s - XON = %2x, XOFF = %2x", __FUNCTION__, port_settings.xon, port_settings.xoff);

	/* get the baud rate wanted */
	port_settings.baud = tty_get_baud_rate(port->tty);
	dbg("%s - baud rate = %d", __FUNCTION__, port_settings.baud);

	/* handle any settings that aren't specified in the tty structure */
	port_settings.lloop = 0;
	
	/* now send the message to the device */
	whiteheat_send_cmd (port->serial, WHITEHEAT_SETUP_PORT, (__u8 *)&port_settings, sizeof(port_settings));
	
exit:
	return;
}


static void whiteheat_throttle (struct usb_serial_port *port)
{
	dbg("%s - port %d", __FUNCTION__, port->number);

	/* Change the control signals */
	/* FIXME!!! */

	return;
}


static void whiteheat_unthrottle (struct usb_serial_port *port)
{
	dbg("%s - port %d", __FUNCTION__, port->number);

	/* Change the control signals */
	/* FIXME!!! */

	return;
}


/* 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_fake_startup (struct usb_serial *serial)
{
	int response;
	const struct whiteheat_hex_record *record;
	
	dbg("%s", __FUNCTION__);
	
	response = ezusb_set_reset (serial, 1);

	record = &whiteheat_loader[0];
	while (record->address != 0xffff) {
		response = ezusb_writememory (serial, record->address, 
				(unsigned char *)record->data, record->data_size, 0xa0);
		if (response < 0) {
			err("%s - ezusb_writememory failed for loader (%d %04X %p %d)",
				__FUNCTION__, response, record->address, record->data, record->data_size);
			break;
		}
		++record;
	}

	response = ezusb_set_reset (serial, 0);

	record = &whiteheat_firmware[0];
	while (record->address < 0x1b40) {
		++record;
	}
	while (record->address != 0xffff) {
		response = ezusb_writememory (serial, record->address, 
				(unsigned char *)record->data, record->data_size, 0xa3);
		if (response < 0) {
			err("%s - ezusb_writememory failed for first firmware step (%d %04X %p %d)", 
				__FUNCTION__, response, record->address, record->data, record->data_size);
			break;
		}
		++record;
	}
	
	response = ezusb_set_reset (serial, 1);

	record = &whiteheat_firmware[0];
	while (record->address < 0x1b40) {
		response = ezusb_writememory (serial, record->address, 
				(unsigned char *)record->data, record->data_size, 0xa0);
		if (response < 0) {
			err("%s - ezusb_writememory failed for second firmware step (%d %04X %p %d)", 
				__FUNCTION__, response, record->address, record->data, record->data_size);
			break;
		}
		++record;
	}

	response = ezusb_set_reset (serial, 0);

	/* we want this device to fail to have a driver assigned to it. */
	return 1;
}


static int  whiteheat_real_startup (struct usb_serial *serial)
{
	struct whiteheat_hw_info *hw_info;
	int pipe;
	int ret;
	int alen;
	__u8 command[2] = { WHITEHEAT_GET_HW_INFO, 0 };
	__u8 result[sizeof(*hw_info) + 1];

	pipe = usb_rcvbulkpipe (serial->dev, 7);
	usb_bulk_msg (serial->dev, pipe, result, sizeof(result), &alen, 2 * HZ);
	/*
	 * We ignore the return code. In the case where rmmod/insmod is
	 * performed with a WhiteHEAT connected, the above times out
	 * because the endpoint is already prepped, meaning the below succeeds
	 * regardless. All other cases the above succeeds.
	 */

	pipe = usb_sndbulkpipe (serial->dev, 7);
	ret = usb_bulk_msg (serial->dev, pipe, command, sizeof(command), &alen, 2 * HZ);
	if (ret) {
		err("%s: Couldn't send command [%d]", serial->type->name, ret);
		goto error_out;
	} else if (alen != sizeof(command)) {
		err("%s: Send command incomplete [%d]", serial->type->name, alen);
		goto error_out;
	}

	pipe = usb_rcvbulkpipe (serial->dev, 7);
	ret = usb_bulk_msg (serial->dev, pipe, result, sizeof(result), &alen, 2 * HZ);
	if (ret) {
		err("%s: Couldn't get results [%d]", serial->type->name, ret);
		goto error_out;
	} else if (alen != sizeof(result)) {
		err("%s: Get results incomplete [%d]", serial->type->name, alen);
		goto error_out;
	} else if (result[0] != command[0]) {
		err("%s: Command failed [%d]", serial->type->name, result[0]);
		goto error_out;
	}

	hw_info = (struct whiteheat_hw_info *)&result[1];

	info("%s: Driver %s: Firmware v%d.%02d", serial->type->name,
	     DRIVER_VERSION, hw_info->sw_major_rev, hw_info->sw_minor_rev);

	return 0;

error_out:
	err("%s: Unable to retrieve firmware version, try replugging\n", serial->type->name);
	/*
	 * Return that we've claimed the interface. A failure here may be
	 * due to interception by the command_callback routine or other
	 * causes that don't mean that the firmware isn't running. This may
	 * change in the future. Probably should actually.
	 */
	return 0;
}

static void whiteheat_real_shutdown (struct usb_serial *serial)
{
	struct usb_serial_port *command_port;

	dbg("%s", __FUNCTION__);

	/* free up our private data for our command port */
	command_port = &serial->port[COMMAND_PORT];
	if (command_port->private != NULL) {
		kfree (command_port->private);
		command_port->private = NULL;
	}

	return;
}


static void set_command (struct usb_serial_port *port, unsigned char state, unsigned char command)
{
	struct whiteheat_rdb_set rdb_command;
	
	/* send a set rts command to the port */
	/* firmware uses 1 based port numbering */
	rdb_command.port = port->number - port->serial->minor + 1;
	rdb_command.state = state;

	whiteheat_send_cmd (port->serial, command, (__u8 *)&rdb_command, sizeof(rdb_command));
}


static inline void set_rts (struct usb_serial_port *port, unsigned char rts)
{
	set_command (port, rts, WHITEHEAT_SET_RTS);
}


static inline void set_dtr (struct usb_serial_port *port, unsigned char dtr)
{
	set_command (port, dtr, WHITEHEAT_SET_DTR);
}


static inline void set_break (struct usb_serial_port *port, unsigned char brk)
{
	set_command (port, brk, WHITEHEAT_SET_BREAK);
}


static int __init whiteheat_init (void)
{
	usb_serial_register (&whiteheat_fake_device);
	usb_serial_register (&whiteheat_device);
	info(DRIVER_DESC " " DRIVER_VERSION);
	return 0;
}


static void __exit whiteheat_exit (void)
{
	usb_serial_deregister (&whiteheat_fake_device);
	usb_serial_deregister (&whiteheat_device);
}


module_init(whiteheat_init);
module_exit(whiteheat_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");

MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");