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-rw-r--r--drivers/usb/serial/ch341.c374
1 files changed, 72 insertions, 302 deletions
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index ab4cc277aa65..d33d39d9b7e2 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -1,7 +1,5 @@
/*
* Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk>
- * Copyright 2007, Werner Cornelius <werner@cornelius-consult.de>
- * Copyright 2009, Boris Hajduk <boris@hajduk.org>
*
* ch341.c implements a serial port driver for the Winchiphead CH341.
*
@@ -23,39 +21,9 @@
#include <linux/usb/serial.h>
#include <linux/serial.h>
-#define DEFAULT_BAUD_RATE 9600
+#define DEFAULT_BAUD_RATE 2400
#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 [] = {
@@ -66,12 +34,9 @@ static struct usb_device_id id_table [] = {
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 */
+ unsigned baud_rate;
+ u8 dtr;
+ u8 rts;
};
static int ch341_control_out(struct usb_device *dev, u8 request,
@@ -107,28 +72,37 @@ static int ch341_set_baudrate(struct usb_device *dev,
{
short a, b;
int r;
- unsigned long factor;
- short divisor;
dbg("ch341_set_baudrate(%d)", priv->baud_rate);
-
- if (!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;
- 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);
@@ -136,18 +110,19 @@ static int ch341_set_baudrate(struct usb_device *dev,
return r;
}
-static int ch341_set_handshake(struct usb_device *dev, u8 control)
+static int ch341_set_handshake(struct usb_device *dev,
+ struct ch341_private *priv)
{
- dbg("ch341_set_handshake(0x%02x)", control);
- return ch341_control_out(dev, 0xa4, ~control, 0);
+ 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);
}
-static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
+static int ch341_get_status(struct usb_device *dev)
{
char *buffer;
int r;
const unsigned size = 8;
- unsigned long flags;
dbg("ch341_get_status()");
@@ -159,15 +134,10 @@ static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
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;
+ /* 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;
out: kfree(buffer);
return r;
@@ -210,7 +180,7 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
goto out;
/* expect 0xff 0xee */
- r = ch341_get_status(dev, priv);
+ r = ch341_get_status(dev);
if (r < 0)
goto out;
@@ -222,12 +192,12 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
if (r < 0)
goto out;
- r = ch341_set_handshake(dev, priv->line_control);
+ r = ch341_set_handshake(dev, priv);
if (r < 0)
goto out;
/* expect 0x9f 0xee */
- r = ch341_get_status(dev, priv);
+ r = ch341_get_status(dev);
out: kfree(buffer);
return r;
@@ -246,10 +216,9 @@ static int ch341_attach(struct usb_serial *serial)
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;
+ priv->dtr = 1;
+ priv->rts = 1;
r = ch341_configure(serial->dev, priv);
if (r < 0)
@@ -262,35 +231,6 @@ error: kfree(priv);
return r;
}
-static void ch341_close(struct tty_struct *tty, 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", __func__, port->number);
-
- /* shutdown our urbs */
- dbg("%s - shutting down urbs", __func__);
- usb_kill_urb(port->write_urb);
- usb_kill_urb(port->read_urb);
- usb_kill_urb(port->interrupt_in_urb);
-
- if (tty) {
- c_cflag = 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 tty_struct *tty, struct usb_serial_port *port,
struct file *filp)
@@ -302,13 +242,14 @@ static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port,
dbg("ch341_open()");
priv->baud_rate = DEFAULT_BAUD_RATE;
- priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
+ priv->dtr = 1;
+ priv->rts = 1;
r = ch341_configure(serial->dev, priv);
if (r)
goto out;
- r = ch341_set_handshake(serial->dev, priv->line_control);
+ r = ch341_set_handshake(serial->dev, priv);
if (r)
goto out;
@@ -316,16 +257,6 @@ static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port,
if (r)
goto out;
- dbg("%s - submitting interrupt urb", __func__);
- 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", __func__, r);
- ch341_close(tty, port, NULL);
- return -EPROTO;
- }
-
r = usb_serial_generic_open(tty, port, filp);
out: return r;
@@ -339,194 +270,38 @@ static void ch341_set_termios(struct tty_struct *tty,
{
struct ch341_private *priv = usb_get_serial_port_data(port);
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);
+ 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;
}
- ch341_set_handshake(port->serial->dev, priv->line_control);
+ ch341_set_baudrate(port->serial->dev, priv);
/* Unimplemented:
* (cflag & CSIZE) : data bits [5, 8]
* (cflag & PARENB) : parity {NONE, EVEN, ODD}
* (cflag & CSTOPB) : stop bits [1, 2]
*/
-}
-
-static int ch341_tiocmset(struct tty_struct *tty, struct file *file,
- unsigned int set, unsigned int clear)
-{
- struct usb_serial_port *port = tty->driver_data;
- 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)", __func__, 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", __func__,
- urb->status);
- return;
- default:
- dbg("%s - nonzero urb status received: %d", __func__,
- urb->status);
- goto exit;
- }
-
- usb_serial_debug_data(debug, &port->dev, __func__,
- 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",
- __func__, 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,*/
-static int ch341_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- struct usb_serial_port *port = tty->driver_data;
- dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
-
- switch (cmd) {
- case TIOCMIWAIT:
- dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
- return wait_modem_info(port, arg);
-
- default:
- dbg("%s not supported = 0x%04x", __func__, cmd);
- break;
- }
-
- return -ENOIOCTLCMD;
-}
-
-static int ch341_tiocmget(struct tty_struct *tty, struct file *file)
-{
- struct usb_serial_port *port = tty->driver_data;
- struct ch341_private *priv = usb_get_serial_port_data(port);
- unsigned long flags;
- u8 mcr;
- u8 status;
- unsigned int result;
-
- dbg("%s (%d)", __func__, 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", __func__, result);
- return result;
+ /* Copy back the old hardware settings */
+ tty_termios_copy_hw(tty->termios, old_termios);
+ /* And re-encode with the new baud */
+ tty_encode_baud_rate(tty, baud_rate, baud_rate);
}
@@ -564,17 +339,12 @@ static struct usb_serial_driver ch341_device = {
.owner = THIS_MODULE,
.name = "ch341-uart",
},
- .id_table = id_table,
- .usb_driver = &ch341_driver,
- .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,
+ .id_table = id_table,
+ .usb_driver = &ch341_driver,
+ .num_ports = 1,
+ .open = ch341_open,
+ .set_termios = ch341_set_termios,
+ .attach = ch341_attach,
};
static int __init ch341_init(void)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 16:10:46 +0100