1 files changed, 591 insertions, 0 deletions

diff --git a/drivers/usb/serial/cp2101.c b/drivers/usb/serial/cp2101.c
new file mode 100644
index 00000000000..7e9bb63eb46
--- /dev/null
+++ b/drivers/usb/serial/cp2101.c
@@ -0,0 +1,591 @@
+/*
+ * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
+ *
+ * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License version
+ *	2 as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/usb.h>
+#include <asm/uaccess.h>
+#include "usb-serial.h"
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v0.03"
+#define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
+
+/*
+ * Function Prototypes
+ */
+static int cp2101_open(struct usb_serial_port*, struct file*);
+static void cp2101_cleanup(struct usb_serial_port*);
+static void cp2101_close(struct usb_serial_port*, struct file*);
+static void cp2101_get_termios(struct usb_serial_port*);
+static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
+static void cp2101_break_ctl(struct usb_serial_port*, int);
+static int cp2101_startup (struct usb_serial *);
+static void cp2101_shutdown(struct usb_serial*);
+
+
+static int debug;
+
+static struct usb_device_id id_table [] = {
+	{USB_DEVICE(0x10c4, 0xea60) },	/*Silicon labs factory default*/
+	{USB_DEVICE(0x10ab, 0x10c5) },	/*Siemens MC60 Cable*/
+	{ } /* Terminating Entry*/
+};
+
+MODULE_DEVICE_TABLE (usb, id_table);
+
+static struct usb_driver cp2101_driver = {
+	.owner		= THIS_MODULE,
+	.name		= "CP2101",
+	.probe		= usb_serial_probe,
+	.disconnect	= usb_serial_disconnect,
+	.id_table	= id_table,
+};
+
+static struct usb_serial_device_type cp2101_device = {
+	.owner			= THIS_MODULE,
+	.name			= "CP2101",
+	.id_table		= id_table,
+	.num_interrupt_in	= 0,
+	.num_bulk_in		= 0,
+	.num_bulk_out		= 0,
+	.num_ports		= 1,
+	.open			= cp2101_open,
+	.close			= cp2101_close,
+	.break_ctl		= cp2101_break_ctl,
+	.set_termios		= cp2101_set_termios,
+	.attach			= cp2101_startup,
+	.shutdown		= cp2101_shutdown,
+};
+
+/*Config request types*/
+#define REQTYPE_HOST_TO_DEVICE	0x41
+#define REQTYPE_DEVICE_TO_HOST	0xc1
+
+/*Config SET requests. To GET, add 1 to the request number*/
+#define CP2101_UART 		0x00	/*Enable / Disable*/
+#define CP2101_BAUDRATE		0x01	/*(BAUD_RATE_GEN_FREQ / baudrate)*/
+#define CP2101_BITS		0x03	/*0x(0)(data bits)(parity)(stop bits)*/
+#define CP2101_BREAK		0x05	/*On / Off*/
+#define CP2101_DTRRTS		0x07	/*101 / 202  ???*/
+#define CP2101_CONFIG_16	0x13	/*16 bytes of config data ???*/
+#define CP2101_CONFIG_6		0x19	/*6 bytes of config data ???*/
+
+/*CP2101_UART*/
+#define UART_ENABLE		0x0001
+#define UART_DISABLE		0x0000
+
+/*CP2101_BAUDRATE*/
+#define BAUD_RATE_GEN_FREQ	0x384000
+
+/*CP2101_BITS*/
+#define BITS_DATA_MASK		0X0f00
+#define BITS_DATA_6		0X0600
+#define BITS_DATA_7		0X0700
+#define BITS_DATA_8		0X0800
+#define BITS_DATA_9		0X0900
+
+#define BITS_PARITY_MASK	0x00f0
+#define BITS_PARITY_NONE	0x0000
+#define BITS_PARITY_ODD		0x0010
+#define BITS_PARITY_EVEN	0x0020
+#define BITS_PARITY_MARK	0x0030
+#define BITS_PARITY_SPACE	0x0040
+
+#define BITS_STOP_MASK		0x000f
+#define BITS_STOP_1		0x0000
+#define BITS_STOP_1_5		0x0001
+#define BITS_STOP_2		0x0002
+#define BREAK_ON		0x0000
+#define BREAK_OFF		0x0001
+
+
+static int cp2101_get_config(struct usb_serial_port* port, u8 request)
+{
+	struct usb_serial *serial = port->serial;
+	unsigned char buf[4];
+	unsigned int value;
+	int result, i;
+
+	/*For get requests, the request number must be incremented*/
+	request++;
+
+	/*Issue the request, attempting to read 4 bytes*/
+	result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
+				request, REQTYPE_DEVICE_TO_HOST, 0x0000,
+				0, buf, 4, 300);
+
+	if (result < 0) {
+		dev_err(&port->dev, "%s - Unable to send config request, "
+				"request=0x%x result=%d\n",
+				__FUNCTION__, request, result);
+		return result;
+	}
+
+	/*Assemble each byte read into an integer value*/
+	value = 0;
+	for (i=0; i<4 && i<result; i++)
+		value |= (buf[i] << (i * 8));
+
+	dbg( " %s - request=0x%x result=%d value=0x%x",
+			__FUNCTION__, request, result, value);
+
+	return value;
+}
+
+static int cp2101_set_config(struct usb_serial_port* port, u8 request, u16 value)
+{
+	struct usb_serial *serial = port->serial;
+	int result;
+	result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0),
+			request, REQTYPE_HOST_TO_DEVICE, value,
+			0, NULL, 0, 300);
+
+	if (result <0) {
+		dev_err(&port->dev, "%s - Unable to send config request, "
+				"request=0x%x value=0x%x result=%d\n",
+				__FUNCTION__, request, value, result);
+		return result;
+	}
+
+	dbg(" %s - request=0x%x value=0x%x result=%d",
+			__FUNCTION__, request, value, result);
+
+	return 0;
+}
+
+static int cp2101_open (struct usb_serial_port *port, struct file *filp)
+{
+	struct usb_serial *serial = port->serial;
+	int result;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (cp2101_set_config(port, CP2101_UART, UART_ENABLE)) {
+		dev_err(&port->dev, "%s - Unable to enable UART\n",
+				__FUNCTION__);
+		return -EPROTO;
+	}
+
+	/* Start reading from the device */
+	usb_fill_bulk_urb (port->read_urb, serial->dev,
+			usb_rcvbulkpipe(serial->dev,
+			port->bulk_in_endpointAddress),
+			port->read_urb->transfer_buffer,
+			port->read_urb->transfer_buffer_length,
+			serial->type->read_bulk_callback,
+			port);
+	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	if (result) {
+		dev_err(&port->dev, "%s - failed resubmitting read urb, "
+				"error %d\n", __FUNCTION__, result);
+		return result;
+	}
+
+	/*Configure the termios structure*/
+	cp2101_get_termios(port);
+
+	return 0;
+}
+
+static void cp2101_cleanup (struct usb_serial_port *port)
+{
+	struct usb_serial *serial = port->serial;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (serial->dev) {
+		/* shutdown any bulk reads that might be going on */
+		if (serial->num_bulk_out)
+			usb_kill_urb(port->write_urb);
+		if (serial->num_bulk_in)
+			usb_kill_urb(port->read_urb);
+	}
+}
+
+static void cp2101_close (struct usb_serial_port *port, struct file * filp)
+{
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	/* shutdown our urbs */
+	dbg("%s - shutting down urbs", __FUNCTION__);
+	usb_kill_urb(port->write_urb);
+	usb_kill_urb(port->read_urb);
+
+	cp2101_set_config(port, CP2101_UART, UART_DISABLE);
+}
+
+/* cp2101_get_termios*/
+/* Reads the baud rate, data bits, parity and stop bits from the device*/
+/* Corrects any unsupported values*/
+/* Configures the termios structure to reflect the state of the device*/
+static void cp2101_get_termios (struct usb_serial_port *port)
+{
+	unsigned int cflag;
+	int baud;
+	int bits;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if ((!port->tty) || (!port->tty->termios)) {
+		dbg("%s - no tty structures", __FUNCTION__);
+		return;
+	}
+	cflag = port->tty->termios->c_cflag;
+
+	baud = cp2101_get_config(port, CP2101_BAUDRATE);
+	/*Convert to baudrate*/
+	if (baud)
+		baud = BAUD_RATE_GEN_FREQ / baud;
+
+	dbg("%s - baud rate = %d", __FUNCTION__, baud);
+	cflag &= ~CBAUD;
+	switch (baud) {
+		/* The baud rates which are commented out below
+		 * appear to be supported by the device
+		 * but are non-standard
+		 */
+		case 600:	cflag |= B600;		break;
+		case 1200:	cflag |= B1200;		break;
+		case 1800:	cflag |= B1800;		break;
+		case 2400:	cflag |= B2400;		break;
+		case 4800:	cflag |= B4800;		break;
+		/*case 7200:	cflag |= B7200;		break;*/
+		case 9600:	cflag |= B9600;		break;
+		/*case 14400:	cflag |= B14400;	break;*/
+		case 19200:	cflag |= B19200;	break;
+		/*case 28800:	cflag |= B28800;	break;*/
+		case 38400:	cflag |= B38400;	break;
+		/*case 55854:	cflag |= B55054;	break;*/
+		case 57600:	cflag |= B57600;	break;
+		case 115200:	cflag |= B115200;	break;
+		/*case 127117:	cflag |= B127117;	break;*/
+		case 230400:	cflag |= B230400;	break;
+		case 460800:	cflag |= B460800;	break;
+		case 921600:	cflag |= B921600;	break;
+		/*case 3686400:	cflag |= B3686400;	break;*/
+		default:
+			dbg("%s - Baud rate is not supported, "
+					"using 9600 baud", __FUNCTION__);
+			cflag |= B9600;
+			cp2101_set_config(port, CP2101_BAUDRATE,
+					(BAUD_RATE_GEN_FREQ/9600));
+			break;
+	}
+
+	bits = cp2101_get_config(port, CP2101_BITS);
+	cflag &= ~CSIZE;
+	switch(bits & BITS_DATA_MASK) {
+		case BITS_DATA_6:
+			dbg("%s - data bits = 6", __FUNCTION__);
+			cflag |= CS6;
+			break;
+		case BITS_DATA_7:
+			dbg("%s - data bits = 7", __FUNCTION__);
+			cflag |= CS7;
+			break;
+		case BITS_DATA_8:
+			dbg("%s - data bits = 8", __FUNCTION__);
+			cflag |= CS8;
+			break;
+		case BITS_DATA_9:
+			dbg("%s - data bits = 9 (not supported, "
+					"using 8 data bits)", __FUNCTION__);
+			cflag |= CS8;
+			bits &= ~BITS_DATA_MASK;
+			bits |= BITS_DATA_8;
+			cp2101_set_config(port, CP2101_BITS, bits);
+			break;
+		default:
+			dbg("%s - Unknown number of data bits, "
+					"using 8", __FUNCTION__);
+			cflag |= CS8;
+			bits &= ~BITS_DATA_MASK;
+			bits |= BITS_DATA_8;
+			cp2101_set_config(port, CP2101_BITS, bits);
+			break;
+	}
+
+	switch(bits & BITS_PARITY_MASK) {
+		case BITS_PARITY_NONE:
+			dbg("%s - parity = NONE", __FUNCTION__);
+			cflag &= ~PARENB;
+			break;
+		case BITS_PARITY_ODD:
+			dbg("%s - parity = ODD", __FUNCTION__);
+			cflag |= (PARENB|PARODD);
+			break;
+		case BITS_PARITY_EVEN:
+			dbg("%s - parity = EVEN", __FUNCTION__);
+			cflag &= ~PARODD;
+			cflag |= PARENB;
+			break;
+		case BITS_PARITY_MARK:
+			dbg("%s - parity = MARK (not supported, "
+					"disabling parity)", __FUNCTION__);
+			cflag &= ~PARENB;
+			bits &= ~BITS_PARITY_MASK;
+			cp2101_set_config(port, CP2101_BITS, bits);
+			break;
+		case BITS_PARITY_SPACE:
+			dbg("%s - parity = SPACE (not supported, "
+					"disabling parity)", __FUNCTION__);
+			cflag &= ~PARENB;
+			bits &= ~BITS_PARITY_MASK;
+			cp2101_set_config(port, CP2101_BITS, bits);
+			break;
+		default:
+			dbg("%s - Unknown parity mode, "
+					"disabling parity", __FUNCTION__);
+			cflag &= ~PARENB;
+			bits &= ~BITS_PARITY_MASK;
+			cp2101_set_config(port, CP2101_BITS, bits);
+			break;
+	}
+
+	cflag &= ~CSTOPB;
+	switch(bits & BITS_STOP_MASK) {
+		case BITS_STOP_1:
+			dbg("%s - stop bits = 1", __FUNCTION__);
+			break;
+		case BITS_STOP_1_5:
+			dbg("%s - stop bits = 1.5 (not supported, "
+					"using 1 stop bit", __FUNCTION__);
+			bits &= ~BITS_STOP_MASK;
+			cp2101_set_config(port, CP2101_BITS, bits);
+			break;
+		case BITS_STOP_2:
+			dbg("%s - stop bits = 2", __FUNCTION__);
+			cflag |= CSTOPB;
+			break;
+		default:
+			dbg("%s - Unknown number of stop bits, "
+					"using 1 stop bit", __FUNCTION__);
+			bits &= ~BITS_STOP_MASK;
+			cp2101_set_config(port, CP2101_BITS, bits);
+			break;
+	}
+
+	port->tty->termios->c_cflag = cflag;
+}
+
+static void cp2101_set_termios (struct usb_serial_port *port,
+		struct termios *old_termios)
+{
+	unsigned int cflag, old_cflag=0;
+	int baud=0;
+	int bits;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if ((!port->tty) || (!port->tty->termios)) {
+		dbg("%s - no tty structures", __FUNCTION__);
+		return;
+	}
+	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__);
+			return;
+		}
+
+		old_cflag = old_termios->c_cflag;
+	}
+
+	/* If the baud rate is to be updated*/
+	if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
+		switch (cflag & CBAUD) {
+			/* The baud rates which are commented out below
+			 * appear to be supported by the device
+			 * but are non-standard
+			 */
+			case B0:	baud = 0;	break;
+			case B600:	baud = 600;	break;
+			case B1200:	baud = 1200;	break;
+			case B1800:	baud = 1800;	break;
+			case B2400:	baud = 2400;	break;
+			case B4800:	baud = 4800;	break;
+			/*case B7200:	baud = 7200;	break;*/
+			case B9600:	baud = 9600;	break;
+			/*ase B14400:	baud = 14400;	break;*/
+			case B19200:	baud = 19200;	break;
+			/*case B28800:	baud = 28800;	break;*/
+			case B38400:	baud = 38400;	break;
+			/*case B55854:	baud = 55054;	break;*/
+			case B57600:	baud = 57600;	break;
+			case B115200:	baud = 115200;	break;
+			/*case B127117:	baud = 127117;	break;*/
+			case B230400:	baud = 230400;	break;
+			case B460800:	baud = 460800;	break;
+			case B921600:	baud = 921600;	break;
+			/*case B3686400:	baud = 3686400;	break;*/
+			default:
+				dev_err(&port->dev, "cp2101 driver does not "
+					"support the baudrate requested\n");
+				break;
+		}
+
+		if (baud) {
+			dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
+					baud);
+			if (cp2101_set_config(port, CP2101_BAUDRATE,
+						(BAUD_RATE_GEN_FREQ / baud)))
+				dev_err(&port->dev, "Baud rate requested not "
+						"supported by device\n");
+		}
+	}
+
+	/*If the number of data bits is to be updated*/
+	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
+		bits = cp2101_get_config(port, CP2101_BITS);
+		bits &= ~BITS_DATA_MASK;
+		switch (cflag & CSIZE) {
+			case CS6:
+				bits |= BITS_DATA_6;
+				dbg("%s - data bits = 6", __FUNCTION__);
+				break;
+			case CS7:
+				bits |= BITS_DATA_7;
+				dbg("%s - data bits = 7", __FUNCTION__);
+				break;
+			case CS8:
+				bits |= BITS_DATA_8;
+				dbg("%s - data bits = 8", __FUNCTION__);
+				break;
+			/*case CS9:
+			 	bits |= BITS_DATA_9;
+				dbg("%s - data bits = 9", __FUNCTION__);
+				break;*/
+			default:
+				dev_err(&port->dev, "cp2101 driver does not "
+					"support the number of bits requested,"
+					" using 8 bit mode\n");
+				bits |= BITS_DATA_8;
+				break;
+		}
+		if (cp2101_set_config(port, CP2101_BITS, bits))
+			dev_err(&port->dev, "Number of data bits requested "
+					"not supported by device\n");
+	}
+
+	if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
+		bits = cp2101_get_config(port, CP2101_BITS);
+		bits &= ~BITS_PARITY_MASK;
+		if (cflag & PARENB) {
+			if (cflag & PARODD) {
+				bits |= BITS_PARITY_ODD;
+				dbg("%s - parity = ODD", __FUNCTION__);
+			} else {
+				bits |= BITS_PARITY_EVEN;
+				dbg("%s - parity = EVEN", __FUNCTION__);
+			}
+		}
+		if (cp2101_set_config(port, CP2101_BITS, bits))
+			dev_err(&port->dev, "Parity mode not supported "
+					"by device\n");
+	}
+
+	if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
+		bits = cp2101_get_config(port, CP2101_BITS);
+		bits &= ~BITS_STOP_MASK;
+		if (cflag & CSTOPB) {
+			bits |= BITS_STOP_2;
+			dbg("%s - stop bits = 2", __FUNCTION__);
+		} else {
+			bits |= BITS_STOP_1;
+			dbg("%s - stop bits = 1", __FUNCTION__);
+		}
+		if (cp2101_set_config(port, CP2101_BITS, bits))
+			dev_err(&port->dev, "Number of stop bits requested "
+					"not supported by device\n");
+	}
+}
+
+static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
+{
+	u16 state;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+	if (break_state == 0)
+		state = BREAK_OFF;
+	else
+		state = BREAK_ON;
+	dbg("%s - turning break %s", __FUNCTION__,
+			state==BREAK_OFF ? "off" : "on");
+	cp2101_set_config(port, CP2101_BREAK, state);
+}
+
+static int cp2101_startup (struct usb_serial *serial)
+{
+	/*CP2101 buffers behave strangely unless device is reset*/
+	usb_reset_device(serial->dev);
+	return 0;
+}
+
+static void cp2101_shutdown (struct usb_serial *serial)
+{
+	int i;
+
+	dbg("%s", __FUNCTION__);
+
+	/* stop reads and writes on all ports */
+	for (i=0; i < serial->num_ports; ++i) {
+		cp2101_cleanup(serial->port[i]);
+	}
+}
+
+static int __init cp2101_init (void)
+{
+	int retval;
+
+	retval = usb_serial_register(&cp2101_device);
+	if (retval)
+		return retval; /*Failed to register*/
+
+	retval = usb_register(&cp2101_driver);
+	if (retval) {
+		/*Failed to register*/
+		usb_serial_deregister(&cp2101_device);
+		return retval;
+	}
+
+	/*Success*/
+	info(DRIVER_DESC " " DRIVER_VERSION);
+	return 0;
+}
+
+static void __exit cp2101_exit (void)
+{
+	usb_deregister (&cp2101_driver);
+	usb_serial_deregister (&cp2101_device);
+}
+
+module_init(cp2101_init);
+module_exit(cp2101_exit);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Enable verbose debugging messages");