USB: kobil_sct: Rework driver

No hardware but this driver is currently totally broken so we can't make
it much worse. Remove all tbe broken invalid termios handling and replace
it with a proper set_termios method.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 55 insertions, 89 deletions

diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index 02a86dbc0e97..6f224195bd25 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -82,6 +82,7 @@ static int  kobil_tiocmset(struct usb_serial_port *port, struct file *file,
                            unsigned int set, unsigned int clear);
 static void kobil_read_int_callback( struct urb *urb );
 static void kobil_write_callback( struct urb *purb );
+static void kobil_set_termios(struct usb_serial_port *port, struct ktermios *old);
 
 
 static struct usb_device_id id_table [] = {
@@ -119,6 +120,7 @@ static struct usb_serial_driver kobil_device = {
         .attach =               kobil_startup,
         .shutdown =             kobil_shutdown,
         .ioctl =                kobil_ioctl,
+        .set_termios =          kobil_set_termios,
         .tiocmget =             kobil_tiocmget,
         .tiocmset =             kobil_tiocmset,
         .open =                 kobil_open,
@@ -137,7 +139,6 @@ struct kobil_private {
         int cur_pos; // index of the next char to send in buf
         __u16 device_type;
         int line_state;
-        struct ktermios internal_termios;
 };
 
 
@@ -216,7 +217,7 @@ static void kobil_shutdown (struct usb_serial *serial)
 
 static int kobil_open (struct usb_serial_port *port, struct file *filp)
 {
-        int i, result = 0;
+        int result = 0;
         struct kobil_private *priv;
         unsigned char *transfer_buffer;
         int transfer_buffer_length = 8;
@@ -242,16 +243,6 @@ static int kobil_open (struct usb_serial_port *port, struct file *filp)
         port->tty->termios->c_iflag = IGNBRK | IGNPAR | IXOFF;
         port->tty->termios->c_oflag &= ~ONLCR; // do NOT translate CR to CR-NL (0x0A -> 0x0A 0x0D)
         
-        // set up internal termios structure 
-        priv->internal_termios.c_iflag = port->tty->termios->c_iflag;
-        priv->internal_termios.c_oflag = port->tty->termios->c_oflag;
-        priv->internal_termios.c_cflag = port->tty->termios->c_cflag;
-        priv->internal_termios.c_lflag = port->tty->termios->c_lflag;
-
-        for (i=0; i<NCCS; i++) {
-                priv->internal_termios.c_cc[i] = port->tty->termios->c_cc[i];
-        }
-        
         // allocate memory for transfer buffer
         transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
         if (! transfer_buffer) {
@@ -607,102 +598,79 @@ static int  kobil_tiocmset(struct usb_serial_port *port, struct file *file,
         return (result < 0) ? result : 0;
 }
 
-
-static int  kobil_ioctl(struct usb_serial_port *port, struct file *file,
-                        unsigned int cmd, unsigned long arg)
+static void kobil_set_termios(struct usb_serial_port *port, struct ktermios *old)
 {
         struct kobil_private * priv;
         int result;
         unsigned short urb_val = 0;
-        unsigned char *transfer_buffer;
-        int transfer_buffer_length = 8;
-        char *settings;
-        void __user *user_arg = (void __user *)arg;
+        int c_cflag = port->tty->termios->c_cflag;
+        speed_t speed;
+        void * settings;
 
         priv = usb_get_serial_port_data(port);
-        if ((priv->device_type == KOBIL_USBTWIN_PRODUCT_ID) || (priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)) {
+        if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID || priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)
                 // This device doesn't support ioctl calls
-                return 0;
-        }
-
-        switch (cmd) {
-        case TCGETS:   // 0x5401
-                if (!access_ok(VERIFY_WRITE, user_arg, sizeof(struct ktermios))) {
-                        dbg("%s - port %d Error in access_ok", __FUNCTION__, port->number);
-                        return -EFAULT;
-                }
-                if (kernel_termios_to_user_termios((struct ktermios __user *)arg,
-                                                   &priv->internal_termios))
-                        return -EFAULT;
-                return 0;
-
-        case TCSETS:   // 0x5402
-                if (!(port->tty->termios)) {
-                        dbg("%s - port %d Error: port->tty->termios is NULL", __FUNCTION__, port->number);
-                        return -ENOTTY;
-                }
-                if (!access_ok(VERIFY_READ, user_arg, sizeof(struct ktermios))) {
-                        dbg("%s - port %d Error in access_ok", __FUNCTION__, port->number);
-                        return -EFAULT;
-                }
-                if (user_termios_to_kernel_termios(&priv->internal_termios,
-                                                   (struct ktermios __user *)arg))
-                        return -EFAULT;
-                
-                settings = kzalloc(50, GFP_KERNEL);
-                if (! settings) {
-                        return -ENOBUFS;
-                }
+                return;
 
-                switch (priv->internal_termios.c_cflag & CBAUD) {
-                case B1200:
+        switch (speed = tty_get_baud_rate(port->tty)) {
+                case 1200:
                         urb_val = SUSBCR_SBR_1200;
-                        strcat(settings, "1200 ");
                         break;
-                case B9600:
+                case 9600:
                 default:
                         urb_val = SUSBCR_SBR_9600;
-                        strcat(settings, "9600 ");
                         break;
-                }
+        }
+        urb_val |= (c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits : SUSBCR_SPASB_1StopBit;
+
+        settings = kzalloc(50, GFP_KERNEL);
+        if (! settings)
+                return;
 
-                urb_val |= (priv->internal_termios.c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits : SUSBCR_SPASB_1StopBit;
-                strcat(settings, (priv->internal_termios.c_cflag & CSTOPB) ? "2 StopBits " : "1 StopBit ");
+        sprintf(settings, "%d ", speed);
 
-                if (priv->internal_termios.c_cflag & PARENB) {
-                        if  (priv->internal_termios.c_cflag & PARODD) {
-                                urb_val |= SUSBCR_SPASB_OddParity;
-                                strcat(settings, "Odd Parity");
-                        } else {
-                                urb_val |= SUSBCR_SPASB_EvenParity;
-                                strcat(settings, "Even Parity");
-                        }
+        if (c_cflag & PARENB) {
+                if  (c_cflag & PARODD) {
+                        urb_val |= SUSBCR_SPASB_OddParity;
+                        strcat(settings, "Odd Parity");
                 } else {
-                        urb_val |= SUSBCR_SPASB_NoParity;
-                        strcat(settings, "No Parity");
+                        urb_val |= SUSBCR_SPASB_EvenParity;
+                        strcat(settings, "Even Parity");
                 }
-                dbg("%s - port %d setting port to: %s", __FUNCTION__, port->number, settings );
+        } else {
+                urb_val |= SUSBCR_SPASB_NoParity;
+                strcat(settings, "No Parity");
+        }
 
-                result = usb_control_msg( port->serial->dev, 
-                                          usb_rcvctrlpipe(port->serial->dev, 0 ), 
-                                          SUSBCRequest_SetBaudRateParityAndStopBits,
-                                          USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
-                                          urb_val,
-                                          0,
-                                          settings,
-                                          0,
-                                          KOBIL_TIMEOUT
-                        );
+        result = usb_control_msg( port->serial->dev,
+                                  usb_rcvctrlpipe(port->serial->dev, 0 ),
+                                  SUSBCRequest_SetBaudRateParityAndStopBits,
+                                  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
+                                  urb_val,
+                                  0,
+                                  settings,
+                                  0,
+                                  KOBIL_TIMEOUT
+                );
+        kfree(settings);
+}
 
-                dbg("%s - port %d Send set_baudrate URB returns: %i", __FUNCTION__, port->number, result);
-                kfree(settings);
+static int kobil_ioctl(struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
+{
+        struct kobil_private * priv = usb_get_serial_port_data(port);
+        unsigned char *transfer_buffer;
+        int transfer_buffer_length = 8;
+        int result;
+
+        if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID || priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)
+                // This device doesn't support ioctl calls
                 return 0;
 
+        switch (cmd) {
         case TCFLSH:   // 0x540B
                 transfer_buffer = kmalloc(transfer_buffer_length, GFP_KERNEL);
-                if (! transfer_buffer) {
+                if (! transfer_buffer)
                         return -ENOBUFS;
-                }
 
                 result = usb_control_msg( port->serial->dev, 
                                           usb_rcvctrlpipe(port->serial->dev, 0 ), 
@@ -716,15 +684,13 @@ static int  kobil_ioctl(struct usb_serial_port *port, struct file *file,
                         );
                 
                 dbg("%s - port %d Send reset_all_queues (FLUSH) URB returns: %i", __FUNCTION__, port->number, result);
-
                 kfree(transfer_buffer);
-                return ((result < 0) ? -EFAULT : 0);
-
+                return (result < 0) ? -EFAULT : 0;
+        default:
+                return -ENOIOCTLCMD;
         }
-        return -ENOIOCTLCMD;
 }
 
-
 static int __init kobil_init (void)
 {
         int retval;