diff -Naur linux-2.6.23-gentoo-r3/Documentation/usb/usb-serial.txt linux-2.6.23-gentoo-r3-ch340patch/Documentation/usb/usb-serial.txt --- linux-2.6.23-gentoo-r3/Documentation/usb/usb-serial.txt 2007-10-09 22:31:38.000000000 +0200 +++ linux-2.6.23-gentoo-r3-ch340patch/Documentation/usb/usb-serial.txt 2007-12-29 23:15:18.000000000 +0100 @@ -428,6 +428,18 @@ See http://www.uuhaus.de/linux/palmconnect.html for up-to-date information on this driver. +Winchiphead CH341 Driver + + This driver is for the Winchiphead CH341 USB-RS232 Converter. This chip + also implements an IEEE 1284 parallel port, I2C and SPI, but that is not + supported by the driver. The protocol was analyzed from the behaviour + of the Windows driver, no datasheet is available at present. + The manufacturer's website: http://www.winchiphead.com/. + For any questions or problems with this driver, please contact + frank kingswood-consulting.co.uk. + Extensions for universal baudrate settings and modem status/control has + been added by werner cornelius-consult.de. + Generic Serial driver If your device is not one of the above listed devices, compatible with diff -Naur linux-2.6.23-gentoo-r3/drivers/usb/serial/ch341.c linux-2.6.23-gentoo-r3-ch340patch/drivers/usb/serial/ch341.c --- linux-2.6.23-gentoo-r3/drivers/usb/serial/ch341.c 1970-01-01 01:00:00.000000000 +0100 +++ linux-2.6.23-gentoo-r3-ch340patch/drivers/usb/serial/ch341.c 2007-12-29 23:23:25.000000000 +0100 @@ -0,0 +1,581 @@ +/* + * Copyright 2007, Frank A Kingswood kingswood-consulting.co.uk> + * + * Copyright 2007, Werner Cornelius cornelius-consult.de> + * for changes/extenions regarding universal baud rate capability and modem + * line control/status routines. + * + * ch341.c implements a serial port driver for the Winchiphead CH341. + * + * The CH341 device can be used to implement an RS232 asynchronous + * serial port, an IEEE-1284 parallel printer port or a memory-like + * interface. In all cases the CH341 supports an I2C interface as well. + * This driver only supports the asynchronous serial interface. + * + * 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 +#include +#include +#include +#include +#include +#include + +#define DEFAULT_BAUD_RATE 9600 +#define DEFAULT_TIMEOUT 1000 + +/* flags for IO-Bits */ +#define CH341_BIT_RTS (1 << 6) +#define CH341_BIT_DTR (1 << 5) + +/******************************/ +/* interrupt pipe definitions */ +/******************************/ +/* always 4 interrupt bytes */ +/* first irq byte normally 0x08 */ +/* second irq byte base 0x7d + below */ +/* third irq byte base 0x94 + below */ +/* fourth irq byte normally 0xee */ + +/* second interrupt byte */ +#define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */ + +/* status returned in third interrupt answer byte, inverted in data from irq */ +#define CH341_BIT_CTS 0x01 +#define CH341_BIT_DSR 0x02 +#define CH341_BIT_RI 0x04 +#define CH341_BIT_DCD 0x08 +#define CH341_BITS_MODEM_STAT 0x0f /* all bits */ + +/*******************************/ +/* baudrate calculation factor */ +/*******************************/ +#define CH341_BAUDBASE_FACTOR 1532620800 +#define CH341_BAUDBASE_DIVMAX 3 + +static int debug; + +static struct usb_device_id id_table [] = { + { USB_DEVICE(0x4348, 0x5523) }, + { }, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +struct ch341_private { + spinlock_t lock; /* access lock */ + wait_queue_head_t delta_msr_wait; /* wait queue for modem status */ + unsigned baud_rate; /* set baud rate */ + u8 line_control; /* set line control value RTS/DTR */ + u8 line_status; /* active status of modem control inputs */ + u8 multi_status_change; /* status changed multiple since last call */ +}; + +static int ch341_control_out(struct usb_device *dev, u8 request, + u16 value, u16 index) +{ + int r; + dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40, + (int)request, (int)value, (int)index); + + r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request, + USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT, + value, index, NULL, 0, DEFAULT_TIMEOUT); + + return r; +} + +static int ch341_control_in(struct usb_device *dev, + u8 request, u16 value, u16 index, + char *buf, unsigned bufsize) +{ + int r; + dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40, + (int)request, (int)value, (int)index, buf, (int)bufsize); + + r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request, + USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN, + value, index, buf, bufsize, DEFAULT_TIMEOUT); + return r; +} + +int ch341_set_baudrate(struct usb_device *dev, struct ch341_private *priv) +{ + short a, b; + int r; + unsigned long factor; + short divisor; + + dbg("ch341_set_baudrate(%d)", priv->baud_rate); + + if (!priv->baud_rate) + return -EINVAL; + + factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate); + divisor = CH341_BAUDBASE_DIVMAX; + + while ((factor > 0xfff0) && divisor) { + factor >>= 3; + divisor--; + } + + if (factor > 0xfff0) + return -EINVAL; + + factor = 0x10000 - factor; + a = (factor & 0xff00) | divisor; + b = factor & 0xff; + + r = ch341_control_out(dev, 0x9a, 0x1312, a); + if (!r) + r = ch341_control_out(dev, 0x9a, 0x0f2c, b); + + return r; +} + +int ch341_set_handshake(struct usb_device *dev, u8 control) +{ + dbg("ch341_set_handshake(0x%02x)", control); + return ch341_control_out(dev, 0xa4, ~control, 0); +} + +int ch341_get_status(struct usb_device *dev, struct ch341_private *priv) +{ + char *buffer; + int r; + const unsigned size = 8; + unsigned long flags; + + dbg("ch341_get_status()"); + + buffer = kmalloc(size, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + + r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size); + if ( r < 0) + goto out; + + /* setup the private status if available */ + if (r == 2) { + r = 0; + spin_lock_irqsave(&priv->lock, flags); + priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT; + priv->multi_status_change = 0; + spin_unlock_irqrestore(&priv->lock, flags); + } else + r = -EPROTO; + +out: kfree(buffer); + return r; +} + +/* -------------------------------------------------------------------------- */ + +int ch341_configure(struct usb_device *dev, struct ch341_private *priv) +{ + char *buffer; + int r; + const unsigned size = 8; + + dbg("ch341_configure()"); + + buffer = kmalloc(size, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + + /* expect two bytes 0x27 0x00 */ + r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size); + if (r < 0) + goto out; + + r = ch341_control_out(dev, 0xa1, 0, 0); + if (r < 0) + goto out; + + r = ch341_set_baudrate(dev, priv); + if (r < 0) + goto out; + + /* expect two bytes 0x56 0x00 */ + r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size); + if (r < 0) + goto out; + + r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050); + if (r < 0) + goto out; + + /* expect 0xff 0xee */ + r = ch341_get_status(dev, priv); + if (r < 0) + goto out; + + r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a); + if (r < 0) + goto out; + + r = ch341_set_baudrate(dev, priv); + if (r < 0) + goto out; + + r = ch341_set_handshake(dev, priv->line_control); + if (r < 0) + goto out; + + /* expect 0x9f 0xee */ + r = ch341_get_status(dev, priv); + +out: kfree(buffer); + return r; +} + +/* allocate private data */ +static int ch341_attach(struct usb_serial *serial) +{ + struct ch341_private *priv; + int r; + + dbg("ch341_attach()"); + + /* private data */ + priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + spin_lock_init(&priv->lock); + init_waitqueue_head(&priv->delta_msr_wait); + priv->baud_rate = DEFAULT_BAUD_RATE; + priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR; + + r = ch341_configure(serial->dev, priv); + if (r < 0) + goto error; + + usb_set_serial_port_data(serial->port[0], priv); + return 0; + +error: kfree(priv); + return r; +} + +static void ch341_close(struct usb_serial_port *port, struct file *filp) +{ + struct ch341_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + unsigned int c_cflag; + + 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); + usb_kill_urb(port->interrupt_in_urb); + + if (port->tty) { + c_cflag = port->tty->termios->c_cflag; + if (c_cflag & HUPCL) { + /* drop DTR and RTS */ + spin_lock_irqsave(&priv->lock, flags); + priv->line_control = 0; + spin_unlock_irqrestore(&priv->lock, flags); + ch341_set_handshake(port->serial->dev, 0); + } + } + wake_up_interruptible(&priv->delta_msr_wait); +} + +/* open this device, set default parameters */ +static int ch341_open(struct usb_serial_port *port, struct file *filp) +{ + struct usb_serial *serial = port->serial; + struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]); + int r; + + dbg("ch341_open()"); + + priv->baud_rate = DEFAULT_BAUD_RATE; + priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR; + + r = ch341_configure(serial->dev, priv); + if (r) + goto out; + + r = ch341_set_handshake(serial->dev, priv->line_control); + if (r) + goto out; + + r = ch341_set_baudrate(serial->dev, priv); + if (r) + goto out; + + dbg("%s - submitting interrupt urb", __FUNCTION__); + port->interrupt_in_urb->dev = serial->dev; + r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); + if (r) { + dev_err(&port->dev, "%s - failed submitting interrupt urb," + " error %d\n", __FUNCTION__, r); + ch341_close(port, NULL); + return -EPROTO; + } + + r = usb_serial_generic_open(port, filp); + +out: return r; +} + +/* Old_termios contains the original termios settings and + * tty->termios contains the new setting to be used. + */ +static void ch341_set_termios(struct usb_serial_port *port, + struct ktermios *old_termios) +{ + struct ch341_private *priv = usb_get_serial_port_data(port); + struct tty_struct *tty = port->tty; + unsigned baud_rate; + unsigned long flags; + + dbg("ch341_set_termios()"); + + if (!tty || !tty->termios) + return; + + baud_rate = tty_get_baud_rate(tty); + priv->baud_rate = baud_rate; + + if (baud_rate) { + spin_lock_irqsave(&priv->lock, flags); + priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); + spin_unlock_irqrestore(&priv->lock, flags); + ch341_set_baudrate(port->serial->dev, priv); + } else { + spin_lock_irqsave(&priv->lock, flags); + priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS); + spin_unlock_irqrestore(&priv->lock, flags); + } + ch341_set_handshake(port->serial->dev, priv->line_control); + + /* Unimplemented: + * (cflag & CSIZE) : data bits [5, 8] + * (cflag & PARENB) : parity {NONE, EVEN, ODD} + * (cflag & CSTOPB) : stop bits [1, 2] + */ +} + +static int ch341_tiocmset(struct usb_serial_port *port, struct file *file, + unsigned int set, unsigned int clear) +{ + struct ch341_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + u8 control; + + spin_lock_irqsave(&priv->lock, flags); + if (set & TIOCM_RTS) + priv->line_control |= CH341_BIT_RTS; + if (set & TIOCM_DTR) + priv->line_control |= CH341_BIT_DTR; + if (clear & TIOCM_RTS) + priv->line_control &= ~CH341_BIT_RTS; + if (clear & TIOCM_DTR) + priv->line_control &= ~CH341_BIT_DTR; + control = priv->line_control; + spin_unlock_irqrestore(&priv->lock, flags); + + return(ch341_set_handshake(port->serial->dev, control)); +} + +static void ch341_read_int_callback(struct urb *urb) +{ + struct usb_serial_port *port = (struct usb_serial_port *) urb->context; + unsigned char *data = urb->transfer_buffer; + unsigned int actual_length = urb->actual_length; + int status; + + dbg("%s (%d)", __FUNCTION__, port->number); + + switch (urb->status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + dbg("%s - urb shutting down with status: %d", __FUNCTION__, + urb->status); + return; + default: + dbg("%s - nonzero urb status received: %d", __FUNCTION__, + urb->status); + goto exit; + } + + usb_serial_debug_data(debug, &port->dev, __FUNCTION__, + urb->actual_length, urb->transfer_buffer); + + if (actual_length >= 4) { + struct ch341_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT; + if ((data[1] & CH341_MULT_STAT)) + priv->multi_status_change = 1; + spin_unlock_irqrestore(&priv->lock, flags); + wake_up_interruptible(&priv->delta_msr_wait); + } + +exit: + status = usb_submit_urb(urb, GFP_ATOMIC); + if (status) + dev_err(&urb->dev->dev, + "%s - usb_submit_urb failed with result %d\n", + __FUNCTION__, status); +} + +static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) +{ + struct ch341_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + u8 prevstatus; + u8 status; + u8 changed; + u8 multi_change = 0; + + spin_lock_irqsave(&priv->lock, flags); + prevstatus = priv->line_status; + priv->multi_status_change = 0; + spin_unlock_irqrestore(&priv->lock, flags); + + while (!multi_change) { + interruptible_sleep_on(&priv->delta_msr_wait); + /* see if a signal did it */ + if (signal_pending(current)) + return -ERESTARTSYS; + + spin_lock_irqsave(&priv->lock, flags); + status = priv->line_status; + multi_change = priv->multi_status_change; + spin_unlock_irqrestore(&priv->lock, flags); + + changed=prevstatus^status; + + if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) || + ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) || + ((arg & TIOCM_CD) && (changed & CH341_BIT_DCD)) || + ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS)) ) { + return 0; + } + prevstatus = status; + } + + return 0; +} + +static int ch341_ioctl(struct usb_serial_port *port, struct file *file, + unsigned int cmd, unsigned long arg) +{ + dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd); + + switch (cmd) { + case TIOCMIWAIT: + dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number); + return wait_modem_info(port, arg); + + default: + dbg("%s not supported = 0x%04x", __FUNCTION__, cmd); + break; + } + + return -ENOIOCTLCMD; +} + +static int ch341_tiocmget(struct usb_serial_port *port, struct file *file) +{ + struct ch341_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + u8 mcr; + u8 status; + unsigned int result; + + dbg("%s (%d)", __FUNCTION__, port->number); + + spin_lock_irqsave(&priv->lock, flags); + mcr = priv->line_control; + status = priv->line_status; + spin_unlock_irqrestore(&priv->lock, flags); + + result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0) + | ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0) + | ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0) + | ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0) + | ((status & CH341_BIT_RI) ? TIOCM_RI : 0) + | ((status & CH341_BIT_DCD) ? TIOCM_CD : 0); + + dbg("%s - result = %x", __FUNCTION__, result); + + return result; +} + +static struct usb_driver ch341_driver = { + .name = "ch341", + .probe = usb_serial_probe, + .disconnect = usb_serial_disconnect, + .id_table = id_table, + .no_dynamic_id = 1, +}; + +static struct usb_serial_driver ch341_device = { + .driver = { + .owner = THIS_MODULE, + .name = "ch341-uart", + }, + .id_table = id_table, + .usb_driver = &ch341_driver, + .num_interrupt_in = 1, //NUM_DONT_CARE, + .num_bulk_in = 1, + .num_bulk_out = 1, + .num_ports = 1, + .open = ch341_open, + .close = ch341_close, + .ioctl = ch341_ioctl, + .set_termios = ch341_set_termios, + .tiocmget = ch341_tiocmget, + .tiocmset = ch341_tiocmset, + .read_int_callback= ch341_read_int_callback, + .attach = ch341_attach, +}; + +static int __init ch341_init(void) +{ + int retval; + + retval = usb_serial_register(&ch341_device); + if (retval) + return retval; + retval = usb_register(&ch341_driver); + if (retval) + usb_serial_deregister(&ch341_device); + return retval; +} + +static void __exit ch341_exit(void) +{ + usb_deregister(&ch341_driver); + usb_serial_deregister(&ch341_device); +} + +module_init(ch341_init); +module_exit(ch341_exit); +MODULE_LICENSE("GPL"); + +module_param(debug, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Debug enabled or not"); + +/* EOF ch341.c */ diff -Naur linux-2.6.23-gentoo-r3/drivers/usb/serial/Kconfig linux-2.6.23-gentoo-r3-ch340patch/drivers/usb/serial/Kconfig --- linux-2.6.23-gentoo-r3/drivers/usb/serial/Kconfig 2007-10-09 22:31:38.000000000 +0200 +++ linux-2.6.23-gentoo-r3-ch340patch/drivers/usb/serial/Kconfig 2007-12-29 23:16:02.000000000 +0100 @@ -92,6 +92,16 @@ To compile this driver as a module, choose M here: the module will be called belkin_sa. +config USB_SERIAL_CH341 + tristate "USB Winchiphead CH341 Single Port Serial Driver" + depends on USB_SERIAL + help + Say Y here if you want to use a Winchiphead CH341 single port + USB to serial adapter. + + To compile this driver as a module, choose M here: the + module will be called ch341. + config USB_SERIAL_WHITEHEAT tristate "USB ConnectTech WhiteHEAT Serial Driver" depends on USB_SERIAL diff -Naur linux-2.6.23-gentoo-r3/drivers/usb/serial/Makefile linux-2.6.23-gentoo-r3-ch340patch/drivers/usb/serial/Makefile --- linux-2.6.23-gentoo-r3/drivers/usb/serial/Makefile 2007-10-09 22:31:38.000000000 +0200 +++ linux-2.6.23-gentoo-r3-ch340patch/drivers/usb/serial/Makefile 2007-12-29 23:16:37.000000000 +0100 @@ -15,6 +15,7 @@ obj-$(CONFIG_USB_SERIAL_AIRPRIME) += airprime.o obj-$(CONFIG_USB_SERIAL_ARK3116) += ark3116.o obj-$(CONFIG_USB_SERIAL_BELKIN) += belkin_sa.o +obj-$(CONFIG_USB_SERIAL_CH341) += ch341.o obj-$(CONFIG_USB_SERIAL_CP2101) += cp2101.o obj-$(CONFIG_USB_SERIAL_CYBERJACK) += cyberjack.o obj-$(CONFIG_USB_SERIAL_CYPRESS_M8) += cypress_m8.o