1 files changed, 88 insertions, 97 deletions

diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 9db23decc5bd..f34a9bb6a219 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -16,6 +16,14 @@
  * See http://geocities.com/i0xox0i for information on this driver and the
  * earthmate usb device.
  *
+ *  Lonnie Mendez <dignome@gmail.com>
+ *  4-29-2005
+ *      Fixed problem where setting or retreiving the serial config would fail with
+ *      EPIPE.  Removed CRTS toggling so the driver behaves more like other usbserial
+ *      adapters.  Issued new interval of 1ms instead of the default 10ms.  As a
+ *      result, transfer speed has been substantially increased.  From avg. 850bps to
+ *      avg. 3300bps.  initial termios has also been modified.  Cleaned up code and
+ *      formatting issues so it is more readable.  Replaced the C++ style comments.
  *
  *  Lonnie Mendez <dignome@gmail.com>
  *  12-15-2004
@@ -32,12 +40,6 @@
  *  10-2003
  *      Driver first released.
  *
- *
- * Long Term TODO:
- *      Improve transfer speeds - both read/write are somewhat slow
- *   at this point.
- *      Improve debugging.  Show modem line status with debug output and
- *   implement filtering for certain data as a module parameter.
  */
 
 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */
@@ -72,11 +74,12 @@
         static int debug;
 #endif
 static int stats;
+static int interval;
 
 /*
  * Version Information
  */
-#define DRIVER_VERSION "v1.08"
+#define DRIVER_VERSION "v1.09"
 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
 #define DRIVER_DESC "Cypress USB to Serial Driver"
 
@@ -130,7 +133,6 @@ struct cypress_private {
         char prev_status, diff_status;     /* used for TIOCMIWAIT */
         /* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
         struct termios tmp_termios;        /* stores the old termios settings */
-        char calledfromopen;               /* used when issuing lines on open - fixes rts drop bug */
 };
 
 /* write buffer structure */
@@ -168,10 +170,8 @@ static void 		  cypress_buf_free(struct cypress_buf *cb);
 static void               cypress_buf_clear(struct cypress_buf *cb);
 static unsigned int       cypress_buf_data_avail(struct cypress_buf *cb);
 static unsigned int       cypress_buf_space_avail(struct cypress_buf *cb);
-static unsigned int       cypress_buf_put(struct cypress_buf *cb, const char *buf,
-                                          unsigned int count);
-static unsigned int       cypress_buf_get(struct cypress_buf *cb, char *buf,
-                                          unsigned int count);
+static unsigned int       cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count);
+static unsigned int       cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count);
 
 
 static struct usb_serial_device_type cypress_earthmate_device = {
@@ -238,10 +238,9 @@ static struct usb_serial_device_type cypress_hidcom_device = {
 static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_mask, int data_bits, int stop_bits,
                                    int parity_enable, int parity_type, int reset, int cypress_request_type)
 {
-        int i, n_baud_rate = 0, retval = 0;
+        int new_baudrate = 0, retval = 0, tries = 0;
         struct cypress_private *priv;
-        __u8 feature_buffer[5];
-        __u8 config;
+        __u8 feature_buffer[8];
         unsigned long flags;
 
         dbg("%s", __FUNCTION__);
@@ -256,7 +255,8 @@ static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_m
                          * of 57600bps (I have no idea whether DeLorme chose to use the general purpose
                          * firmware or not), if you need to modify this speed setting for your own
                          * project please add your own chiptype and modify the code likewise.  The
-                         * Cypress HID->COM device will work successfully up to 115200bps.
+                         * Cypress HID->COM device will work successfully up to 115200bps (but the
+                         * actual throughput is around 3kBps).
                          */
                         if (baud_mask != priv->cbr_mask) {
                                 dbg("%s - baud rate is changing", __FUNCTION__);
@@ -265,109 +265,114 @@ static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_m
                                          * but are not used with NMEA and SiRF protocols */
                                         
                                         if ( (baud_mask == B300) || (baud_mask == B600) ) {
-                                                err("%s - failed setting baud rate, unsupported speed (default to 4800)",
+                                                err("%s - failed setting baud rate, unsupported speed",
                                                     __FUNCTION__);
-                                                n_baud_rate = 4800;
-                                        } else if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
-                                                err("%s - failed setting baud rate, unsupported speed (default to 4800)",
+                                                new_baudrate = priv->baud_rate;
+                                        } else if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
+                                                err("%s - failed setting baud rate, unsupported speed",
                                                     __FUNCTION__);
-                                                n_baud_rate = 4800;
+                                                new_baudrate = priv->baud_rate;
                                         }
                                 } else if (priv->chiptype == CT_CYPHIDCOM) {
-                                        if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
-                                                err("%s - failed setting baud rate, unsupported speed (default to 4800)",
+                                        if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
+                                                err("%s - failed setting baud rate, unsupported speed",
                                                     __FUNCTION__);
-                                                n_baud_rate = 4800;
+                                                new_baudrate = priv->baud_rate;
                                         }
                                 } else if (priv->chiptype == CT_GENERIC) {
-                                        if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
-                                                err("%s - failed setting baud rate, unsupported speed (default to 4800)",
+                                        if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
+                                                err("%s - failed setting baud rate, unsupported speed",
                                                     __FUNCTION__);
-                                                n_baud_rate = 4800;
+                                                new_baudrate = priv->baud_rate;
                                         }
                                 } else {
-                                        info("%s - please define your chiptype, using 4800bps default", __FUNCTION__);
-                                        n_baud_rate = 4800;
+                                        info("%s - please define your chiptype", __FUNCTION__);
+                                        new_baudrate = priv->baud_rate;
                                 }
                         } else {  /* baud rate not changing, keep the old */
-                                n_baud_rate = priv->baud_rate;
+                                new_baudrate = priv->baud_rate;
                         }
-                        dbg("%s - baud rate is being sent as %d", __FUNCTION__, n_baud_rate);
-
+                        dbg("%s - baud rate is being sent as %d", __FUNCTION__, new_baudrate);
                         
-                        /*
-                         * This algorithm accredited to Jiang Jay Zhang... thanks for all the help!
-                         */
-                        for (i = 0; i < 4; ++i) {
-                                feature_buffer[i] = ( n_baud_rate >> (i*8) & 0xFF );
-                        }
+                        memset(feature_buffer, 0, 8);
+                        /* fill the feature_buffer with new configuration */
+                        *((u_int32_t *)feature_buffer) = new_baudrate;
 
-                        config = 0;                      // reset config byte
-                        config |= data_bits;             // assign data bits in 2 bit space ( max 3 )
+                        feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
                         /* 1 bit gap */
-                        config |= (stop_bits << 3);      // assign stop bits in 1 bit space
-                        config |= (parity_enable << 4);  // assign parity flag in 1 bit space
-                        config |= (parity_type << 5);    // assign parity type in 1 bit space
+                        feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
+                        feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
+                        feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
                         /* 1 bit gap */
-                        config |= (reset << 7);          // assign reset at end of byte, 1 bit space
-
-                        feature_buffer[4] = config;
+                        feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
                                 
                         dbg("%s - device is being sent this feature report:", __FUNCTION__);
                         dbg("%s - %02X - %02X - %02X - %02X - %02X", __FUNCTION__, feature_buffer[0], feature_buffer[1],
                             feature_buffer[2], feature_buffer[3], feature_buffer[4]);
                         
+                        do {
                         retval = usb_control_msg (port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
                                                   HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
-                                                  0x0300, 0, feature_buffer, 5, 500);
+                                                          0x0300, 0, feature_buffer, 8, 500);
+
+                                if (tries++ >= 3)
+                                        break;
 
-                        if (retval != 5)
+                                if (retval == EPIPE)
+                                        usb_clear_halt(port->serial->dev, 0x00);
+                        } while (retval != 8 && retval != ENODEV);
+
+                        if (retval != 8)
                                 err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
                         else {
                                 spin_lock_irqsave(&priv->lock, flags);
-                                priv->baud_rate = n_baud_rate;
+                                priv->baud_rate = new_baudrate;
                                 priv->cbr_mask = baud_mask;
-                                priv->current_config = config;
-                                ++priv->cmd_count;
+                                priv->current_config = feature_buffer[4];
                                 spin_unlock_irqrestore(&priv->lock, flags);
                         }
                 break;
                 case CYPRESS_GET_CONFIG:
                         dbg("%s - retreiving serial line settings", __FUNCTION__);
-                        /* reset values in feature buffer */
-                        memset(feature_buffer, 0, 5);
+                        /* set initial values in feature buffer */
+                        memset(feature_buffer, 0, 8);
 
+                        do {
                         retval = usb_control_msg (port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
                                                   HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
-                                                  0x0300, 0, feature_buffer, 5, 500);
+                                                          0x0300, 0, feature_buffer, 8, 500);
+                                
+                                if (tries++ >= 3)
+                                        break;
+
+                                if (retval == EPIPE)
+                                        usb_clear_halt(port->serial->dev, 0x00);
+                        } while (retval != 5 && retval != ENODEV);
+
                         if (retval != 5) {
                                 err("%s - failed to retreive serial line settings - %d", __FUNCTION__, retval);
                                 return retval;
                         } else {
                                 spin_lock_irqsave(&priv->lock, flags);
+
                                 /* store the config in one byte, and later use bit masks to check values */
                                 priv->current_config = feature_buffer[4];
-                                /* reverse the process above to get the baud_mask value */
-                                n_baud_rate = 0; // reset bits
-                                for (i = 0; i < 4; ++i) {
-                                        n_baud_rate |= ( feature_buffer[i] << (i*8) );
-                                }
+                                priv->baud_rate = *((u_int32_t *)feature_buffer);
                                 
-                                priv->baud_rate = n_baud_rate;
-                                if ( (priv->cbr_mask = rate_to_mask(n_baud_rate)) == 0x40)
+                                if ( (priv->cbr_mask = rate_to_mask(priv->baud_rate)) == 0x40)
                                         dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
-                                ++priv->cmd_count;
                                 spin_unlock_irqrestore(&priv->lock, flags);
                         }
-                        break;
-                default:
-                        err("%s - unsupported serial control command issued", __FUNCTION__);
         }
+        spin_lock_irqsave(&priv->lock, flags);
+        ++priv->cmd_count;
+        spin_unlock_irqrestore(&priv->lock, flags);
+
         return retval;
 } /* cypress_serial_control */
 
 
-/* given a baud mask, it will return speed on success */
+/* given a baud mask, it will return integer baud on success */
 static int mask_to_rate (unsigned mask)
 {
         int rate;
@@ -438,11 +443,12 @@ static int generic_startup (struct usb_serial *serial)
         
         usb_reset_configuration (serial->dev);
         
+        interval = 1;
         priv->cmd_ctrl = 0;
         priv->line_control = 0;
         priv->termios_initialized = 0;
-        priv->calledfromopen = 0;
         priv->rx_flags = 0;
+        priv->cbr_mask = B300;
         usb_set_serial_port_data(serial->port[0], priv);
         
         return (0);     
@@ -513,7 +519,6 @@ static int cypress_open (struct usb_serial_port *port, struct file *filp)
         dbg("%s - port %d", __FUNCTION__, port->number);
 
         /* clear halts before open */
-        usb_clear_halt(serial->dev, 0x00);
         usb_clear_halt(serial->dev, 0x81);
         usb_clear_halt(serial->dev, 0x02);
 
@@ -531,7 +536,6 @@ static int cypress_open (struct usb_serial_port *port, struct file *filp)
         /* raise both lines and set termios */
         spin_lock_irqsave(&priv->lock, flags);
         priv->line_control = CONTROL_DTR | CONTROL_RTS;
-        priv->calledfromopen = 1;
         priv->cmd_ctrl = 1;
         spin_unlock_irqrestore(&priv->lock, flags);
         result = cypress_write(port, NULL, 0);
@@ -553,7 +557,7 @@ static int cypress_open (struct usb_serial_port *port, struct file *filp)
         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
                 port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
-                cypress_read_int_callback, port, port->interrupt_in_urb->interval);
+                cypress_read_int_callback, port, interval);
         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 
         if (result){
@@ -680,12 +684,12 @@ static void cypress_send(struct usb_serial_port *port)
         spin_lock_irqsave(&priv->lock, flags);
         switch (port->interrupt_out_size) {
                 case 32:
-                        // this is for the CY7C64013...
+                        /* this is for the CY7C64013... */
                         offset = 2;
                         port->interrupt_out_buffer[0] = priv->line_control;
                         break;
                 case 8:
-                        // this is for the CY7C63743...
+                        /* this is for the CY7C63743... */
                         offset = 1;
                         port->interrupt_out_buffer[0] = priv->line_control;
                         break;
@@ -738,6 +742,7 @@ send:
 
         port->interrupt_out_urb->transfer_buffer_length = actual_size;
         port->interrupt_out_urb->dev = port->serial->dev;
+        port->interrupt_out_urb->interval = interval;
         result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
         if (result) {
                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
@@ -910,7 +915,7 @@ static void cypress_set_termios (struct usb_serial_port *port, struct termios *o
         unsigned cflag, iflag, baud_mask;
         unsigned long flags;
         __u8 oldlines;
-        int linechange;
+        int linechange = 0;
         
         dbg("%s - port %d", __FUNCTION__, port->number);
 
@@ -996,15 +1001,7 @@ static void cypress_set_termios (struct usb_serial_port *port, struct termios *o
                         case B115200: dbg("%s - setting baud 115200bps", __FUNCTION__); break;
                         default: dbg("%s - unknown masked baud rate", __FUNCTION__);
                 }
-                priv->line_control |= CONTROL_DTR;
-                
-                /* toggle CRTSCTS? - don't do this if being called from cypress_open */
-                if (!priv->calledfromopen) {
-                        if (cflag & CRTSCTS)
-                                priv->line_control |= CONTROL_RTS;
-                        else
-                                priv->line_control &= ~CONTROL_RTS;
-                }
+                priv->line_control = (CONTROL_DTR | CONTROL_RTS);
         }
         spin_unlock_irqrestore(&priv->lock, flags);
         
@@ -1014,8 +1011,6 @@ static void cypress_set_termios (struct usb_serial_port *port, struct termios *o
         cypress_serial_control(port, baud_mask, data_bits, stop_bits, parity_enable,
                                parity_type, 0, CYPRESS_SET_CONFIG);
 
-        msleep(50);                     /* give some time between change and read (50ms) */
-
         /* we perform a CYPRESS_GET_CONFIG so that the current settings are filled into the private structure
          * this should confirm that all is working if it returns what we just set */
         cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
@@ -1031,7 +1026,6 @@ static void cypress_set_termios (struct usb_serial_port *port, struct termios *o
                 dbg("Using custom termios settings for a baud rate of 4800bps.");
                 /* define custom termios settings for NMEA protocol */
 
-                
                 tty->termios->c_iflag /* input modes - */
                         &= ~(IGNBRK             /* disable ignore break */
                         | BRKINT                /* disable break causes interrupt */
@@ -1052,23 +1046,16 @@ static void cypress_set_termios (struct usb_serial_port *port, struct termios *o
                         | ISIG                  /* disable interrupt, quit, and suspend special characters */
                         | IEXTEN);              /* disable non-POSIX special characters */
 
-        } else if (priv->chiptype == CT_CYPHIDCOM) {
-
-                // Software app handling it for device...       
+        } /* CT_CYPHIDCOM: Application should handle this for device */
 
-        }
         linechange = (priv->line_control != oldlines);
         spin_unlock_irqrestore(&priv->lock, flags);
 
         /* if necessary, set lines */
-        if (!priv->calledfromopen && linechange) {
+        if (linechange) {
                 priv->cmd_ctrl = 1;
                 cypress_write(port, NULL, 0);
         }
-
-        if (priv->calledfromopen)
-                priv->calledfromopen = 0;
-        
 } /* cypress_set_termios */
 
  
@@ -1164,7 +1151,7 @@ static void cypress_read_int_callback(struct urb *urb, struct pt_regs *regs)
         spin_lock_irqsave(&priv->lock, flags);
         switch(urb->actual_length) {
                 case 32:
-                        // This is for the CY7C64013...
+                        /* This is for the CY7C64013... */
                         priv->current_status = data[0] & 0xF8;
                         bytes = data[1]+2;
                         i=2;
@@ -1172,7 +1159,7 @@ static void cypress_read_int_callback(struct urb *urb, struct pt_regs *regs)
                                 havedata = 1;
                         break;
                 case 8:
-                        // This is for the CY7C63743...
+                        /* This is for the CY7C63743... */
                         priv->current_status = data[0] & 0xF8;
                         bytes = (data[0] & 0x07)+1;
                         i=1;
@@ -1245,7 +1232,7 @@ continue_read:
                 port->interrupt_in_urb->transfer_buffer,
                 port->interrupt_in_urb->transfer_buffer_length,
                 cypress_read_int_callback, port,
-                port->interrupt_in_urb->interval);
+                interval);
         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
         if (result)
                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
@@ -1274,6 +1261,8 @@ static void cypress_write_int_callback(struct urb *urb, struct pt_regs *regs)
                         dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
                         priv->write_urb_in_use = 0;
                         return;
+                case -EPIPE: /* no break needed */
+                        usb_clear_halt(port->serial->dev, 0x02);
                 default:
                         /* error in the urb, so we have to resubmit it */
                         dbg("%s - Overflow in write", __FUNCTION__);
@@ -1535,3 +1524,5 @@ module_param(debug, bool, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(debug, "Debug enabled or not");
 module_param(stats, bool, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(stats, "Enable statistics or not");
+module_param(interval, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(interval, "Overrides interrupt interval");