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Message-Id: <200709211015.11470.Werner.Cornelius@cornelius-consult.de>
Date: Fri, 21 Sep 2007 10:15:11 +0200
From: Werner Cornelius <Werner.Cornelius@...nelius-consult.de>
To: Greg KH <greg@...ah.com>
Cc: linux-kernel@...r.kernel.org, mtosatti@...hat.com
Subject: [PATCH] Re: Serial USB-driver for Winchiphead CH340/41 chip
Hello,
attached you will find the patch against the 2.6.23-rc6-mm1
Changed fetaures:
1. All baudrates possible (dynamic baudfactor calculation)
2. Added support of modem control and status lines.
Still missing (due to lack of an usb sniffer):
1. Break control
2. Parity
Werner
--- linux-2.6.23-rc6-mm1/drivers/usb/serial/ch341.c 2007-09-21
09:56:56.000000000 +0200
+++ develop/drivers/usb/serial/ch341.c 2007-09-21 10:00:26.000000000 +0200
@@ -1,5 +1,9 @@
/*
- * Copyright 2007, Frank A Kingswood <frank@...gswood-consulting.co.uk>
+ * Copyright 2007, Frank A Kingswood <frank <at> kingswood-consulting.co.uk>
+ *
+ * Copyright 2007, Werner Cornelius <werner <at> 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.
*
@@ -21,327 +25,548 @@
#include <linux/usb/serial.h>
#include <linux/serial.h>
-#define DEFAULT_BAUD_RATE 2400
+#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) },
- { },
+ { USB_DEVICE(0x4348, 0x5523) },
+ { },
};
MODULE_DEVICE_TABLE(usb, id_table);
struct ch341_private {
- unsigned baud_rate;
- u8 dtr;
- u8 rts;
+ 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)
+ u16 value, u16 index)
{
- int r;
- dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40,
- (int)request, (int)value, (int)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);
+ 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;
+ return r;
}
static int ch341_control_in(struct usb_device *dev,
- u8 request, u16 value, u16 index,
- char *buf, unsigned bufsize)
+ 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;
-}
-
-static int ch341_set_baudrate(struct usb_device *dev,
- struct ch341_private *priv)
-{
- short a, b;
- int r;
-
- dbg("ch341_set_baudrate(%d)", priv->baud_rate);
- switch (priv->baud_rate) {
- case 2400:
- a = 0xd901;
- b = 0x0038;
- break;
- case 4800:
- a = 0x6402;
- b = 0x001f;
- break;
- case 9600:
- a = 0xb202;
- b = 0x0013;
- break;
- case 19200:
- a = 0xd902;
- b = 0x000d;
- break;
- case 38400:
- a = 0x6403;
- b = 0x000a;
- break;
- case 115200:
- a = 0xcc03;
- b = 0x0008;
- break;
- default:
- return -EINVAL;
- }
+ 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);
- r = ch341_control_out(dev, 0x9a, 0x1312, a);
- if (!r)
- r = ch341_control_out(dev, 0x9a, 0x0f2c, b);
+ if (!priv->baud_rate)
+ return -EINVAL;
+
+ factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate);
+ divisor = CH341_BAUDBASE_DIVMAX;
- return r;
+ 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;
}
-static int ch341_set_handshake(struct usb_device *dev,
- struct ch341_private *priv)
+int ch341_set_handshake(struct usb_device *dev, u8 control)
{
- dbg("ch341_set_handshake(%d,%d)", priv->dtr, priv->rts);
- return ch341_control_out(dev, 0xa4,
- ~((priv->dtr?1<<5:0)|(priv->rts?1<<6:0)), 0);
+ dbg("ch341_set_handshake(0x%02x)", control);
+ return ch341_control_out(dev, 0xa4, ~control, 0);
}
-static int ch341_get_status(struct usb_device *dev)
+int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
{
- char *buffer;
- int r;
- const unsigned size = 8;
+ char *buffer;
+ int r;
+ const unsigned size = 8;
+ unsigned long flags;
- dbg("ch341_get_status()");
+ dbg("ch341_get_status()");
- buffer = kmalloc(size, GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
+ buffer = kmalloc(size, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
- r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size);
- if ( r < 0)
- goto out;
+ r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size);
+ if ( r < 0)
+ goto out;
- /* Not having the datasheet for the CH341, we ignore the bytes returned
- * from the device. Return error if the device did not respond in time.
- */
- r = 0;
+ /* 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;
+out: kfree(buffer);
+ return r;
}
/* --------------------------------------------------------------------------
*/
-static int ch341_configure(struct usb_device *dev, struct ch341_private
*priv)
+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);
- 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);
- if (r < 0)
- goto out;
+ 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);
+ /* expect 0x9f 0xee */
+ r = ch341_get_status(dev, priv);
-out: kfree(buffer);
- return r;
+out: kfree(buffer);
+ return r;
}
/* allocate private data */
static int ch341_attach(struct usb_serial *serial)
{
- struct ch341_private *priv;
- int r;
+ struct ch341_private *priv;
+ int r;
- dbg("ch341_attach()");
+ dbg("ch341_attach()");
- /* private data */
- priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
+ /* private data */
+ priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
- priv->baud_rate = DEFAULT_BAUD_RATE;
- priv->dtr = 1;
- priv->rts = 1;
+ 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;
+ r = ch341_configure(serial->dev, priv);
+ if (r < 0)
+ goto error;
- usb_set_serial_port_data(serial->port[0], priv);
- return 0;
+ usb_set_serial_port_data(serial->port[0], priv);
+ return 0;
-error: kfree(priv);
- return r;
+error: kfree(priv);
+ return r;
}
-/* open this device, set default parameters */
-static int ch341_open(struct usb_serial_port *port, struct file *filp)
+static void ch341_close(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->dtr = 1;
- priv->rts = 1;
+ struct ch341_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ unsigned int c_cflag;
- r = ch341_configure(serial->dev, priv);
- if (r)
- goto out;
+ dbg("%s - port %d", __FUNCTION__, port->number);
- r = ch341_set_handshake(serial->dev, priv);
- if (r)
- goto out;
+ /* 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);
+}
- r = ch341_set_baudrate(serial->dev, priv);
- if (r)
- goto out;
+/* 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);
+ r = usb_serial_generic_open(port, filp);
-out: return r;
+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 ktermios *old_termios)
{
- struct ch341_private *priv = usb_get_serial_port_data(port);
- struct tty_struct *tty = port->tty;
- unsigned baud_rate;
+ 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]
+ */
+}
- dbg("ch341_set_termios()");
+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;
- if (!tty || !tty->termios)
+ 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;
+ }
- baud_rate = tty_get_baud_rate(tty);
+ usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
+ urb->actual_length, urb->transfer_buffer);
- switch (baud_rate) {
- case 2400:
- case 4800:
- case 9600:
- case 19200:
- case 38400:
- case 115200:
- priv->baud_rate = baud_rate;
- break;
- default:
- dbg("Rate %d not supported, using %d",
- baud_rate, DEFAULT_BAUD_RATE);
- priv->baud_rate = DEFAULT_BAUD_RATE;
+ 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;
}
- ch341_set_baudrate(port->serial->dev, priv);
+ 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);
- /* Unimplemented:
- * (cflag & CSIZE) : data bits [5, 8]
- * (cflag & PARENB) : parity {NONE, EVEN, ODD}
- * (cflag & CSTOPB) : stop bits [1, 2]
- */
+ 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,
+ .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 = NUM_DONT_CARE,
- .num_bulk_in = 1,
- .num_bulk_out = 1,
- .num_ports = 1,
- .open = ch341_open,
- .set_termios = ch341_set_termios,
- .attach = ch341_attach,
+ .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;
+ 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;
+ 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);
+ usb_deregister(&ch341_driver);
+ usb_serial_deregister(&ch341_device);
}
module_init(ch341_init);
--- linux-2.6.23-rc6-mm1/Documentation/usb/usb-serial.txt 2007-09-21
09:56:55.000000000 +0200
+++ develop/Documentation/usb/usb-serial.txt 2007-09-21 10:03:18.000000000
+0200
@@ -437,6 +437,8 @@
The manufacturer's website: http://www.winchiphead.com/.
For any questions or problems with this driver, please contact
frank@...gswood-consulting.co.uk.
+ Extensions for universal baudrate settings and modem status/control have
+ been added by werner <at> cornelius-consult.de.
Generic Serial driver
Am Donnerstag, 20. September 2007 02:03 schrieb Greg KH:
> On Fri, Sep 14, 2007 at 02:38:55PM +0200, Werner Cornelius wrote:
> > Hello,
> >
> > I know that there has been a patch for the Winchiphead CH340/41 USB to
> > serial converter chips on the net, but they have been implemented with
> > only a basic feature and limited baudrates due to the lack of any
> > datasheets.
> >
> > I picked these patches up and added all common baudrates as well as the
> > complete modem control and status handling to be able of using this
> > adapter in nearly all applications.
>
> Care to just send me a patch against the -mm tree, for these new
> features? The driver, with the proper attribution from the original
> author, is already in that tree and will be going into the 2.6.24
> release.
>
> thanks,
>
> greg k-h
-
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