[PATCH] USB: tiglusb.c: add direct USB support on some new TI handhelds

I have extended my driver to add support of the embedded USB port provided by
some new Texas Instruments' handhelds. Things are the same except for the
maximum packet size.

Description: add support of the USB port embedded on some new TI handhelds (TI84+ and TI89 Titanium).

Thanks, Romain.
Signed-off-by: Romain Lievin <lkml@lievin.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

Documentation/usb/silverlink.txt

 -------------------------------------------------------------------------
 Readme for Linux device driver for the Texas Instruments SilverLink cable
+and direct USB cable provided by some TI's handhelds.
 -------------------------------------------------------------------------
 
 Author: Romain Liévin & Julien Blache
@@ -9,7 +10,8 @@ INTRODUCTION:
 
 This is a driver for the TI-GRAPH LINK USB (aka SilverLink) cable, a cable 
 designed by TI for connecting their TI8x/9x calculators to a computer 
-(PC or Mac usually).
+(PC or Mac usually). It has been extended to support the USB port offered by
+some latest TI handhelds (TI84+ and TI89 Titanium).
 
 If you need more information, please visit the 'SilverLink drivers' homepage 
 at the above URL.
@@ -73,4 +75,4 @@ this driver but he better knows the Mac OS-X driver.
 CREDITS:
 
 The code is based on dabusb.c, printer.c and scanner.c !
-The driver has been developed independently of Texas Instruments.
+The driver has been developed independently of Texas Instruments Inc.

drivers/usb/misc/tiglusb.c

@@ -4,7 +4,7 @@
  * Target: Texas Instruments graphing calculators (http://lpg.ticalc.org).
  *
  * Copyright (C) 2001-2004:
- *   Romain Lievin <roms@lpg.ticalc.org>
+ *   Romain Lievin <roms@tilp.info>
  *   Julien BLACHE <jb@technologeek.org>
  * under the terms of the GNU General Public License.
  *
@@ -14,7 +14,7 @@
  * and the website at:  http://lpg.ticalc.org/prj_usb/
  * for more info.
  *
- * History :
+ * History:
  *   1.0x, Romain & Julien: initial submit.
  *   1.03, Greg Kroah: modifications.
  *   1.04, Julien: clean-up & fixes; Romain: 2.4 backport.
@@ -22,6 +22,7 @@
  *   1.06, Romain: synched with 2.5, version/firmware changed (confusing).
  *   1.07, Romain: fixed bad use of usb_clear_halt (invalid argument);
  *          timeout argument checked in ioctl + clean-up.
+ *   1.08, Romain: added support of USB port embedded on some TI's handhelds.
  */
 
 #include <linux/module.h>
@@ -41,7 +42,7 @@
 /*
  * Version Information
  */
-#define DRIVER_VERSION "1.07"
+#define DRIVER_VERSION "1.08"
 #define DRIVER_AUTHOR  "Romain Lievin <roms@tilp.info> & Julien Blache <jb@jblache.org>"
 #define DRIVER_DESC    "TI-GRAPH LINK USB (aka SilverLink) driver"
 #define DRIVER_LICENSE "GPL"
@@ -178,11 +179,11 @@ tiglusb_read (struct file *filp, char __user *buf, size_t count, loff_t * f_pos)
 	if (!s->dev)
 		return -EIO;
 
-	buffer = kmalloc(BULK_RCV_MAX, GFP_KERNEL);
+	buffer = kmalloc (s->max_ps, GFP_KERNEL);
 	if (!buffer)
 		return -ENOMEM;
 
-	bytes_to_read = (count >= BULK_RCV_MAX) ? BULK_RCV_MAX : count;
+	bytes_to_read = (count >= s->max_ps) ? s->max_ps : count;
 
 	pipe = usb_rcvbulkpipe (s->dev, 1);
 	result = usb_bulk_msg (s->dev, pipe, buffer, bytes_to_read,
@@ -235,11 +236,11 @@ tiglusb_write (struct file *filp, const char __user *buf, size_t count, loff_t *
 	if (!s->dev)
 		return -EIO;
 
-	buffer = kmalloc(BULK_SND_MAX, GFP_KERNEL);
+	buffer = kmalloc (s->max_ps, GFP_KERNEL);
 	if (!buffer)
 		return -ENOMEM;
 
-	bytes_to_write = (count >= BULK_SND_MAX) ? BULK_SND_MAX : count;
+	bytes_to_write = (count >= s->max_ps) ? s->max_ps : count;
 	if (copy_from_user (buffer, buf, bytes_to_write)) {
 		ret = -EFAULT;
 		goto out;
@@ -309,6 +310,15 @@ tiglusb_ioctl (struct inode *inode, struct file *filp,
 		if (clear_pipes (s->dev))
 			ret = -EIO;
 		break;
+	case IOCTL_TIUSB_GET_MAXPS:
+                if (copy_to_user((int *) arg, &s->max_ps, sizeof(int)))
+                        return -EFAULT;
+                break;
+        case IOCTL_TIUSB_GET_DEVID:
+                if (copy_to_user((int *) arg, &s->dev->descriptor.idProduct,
+                                 sizeof(int)))
+                        return -EFAULT;
+                break;
 	default:
 		ret = -ENOTTY;
 		break;
@@ -341,6 +351,9 @@ tiglusb_probe (struct usb_interface *intf,
 	int minor = -1;
 	int i, err = 0;
 	ptiglusb_t s;
+	struct usb_host_config *conf;
+        struct usb_host_interface *ifdata = NULL;
+        int max_ps;
 
 	dbg ("probing vendor id 0x%x, device id 0x%x",
 	     dev->descriptor.idVendor, dev->descriptor.idProduct);
@@ -355,19 +368,31 @@ tiglusb_probe (struct usb_interface *intf,
 		goto out;
 	}
 
-	if ((dev->descriptor.idProduct != 0xe001)
-	    && (dev->descriptor.idVendor != 0x451)) {
+	if (dev->descriptor.idVendor != 0x451) {
 		err = -ENODEV;
 		goto out;
 	}
 
-	// NOTE:  it's already in this config, this shouldn't be needed.
-	// is this working around some hardware bug?
-	if (usb_reset_configuration (dev) < 0) {
-		err ("tiglusb_probe: reset_configuration failed");
-		err = -ENODEV;
-		goto out;
-	}
+	if ((dev->descriptor.idProduct != 0xe001) &&
+            (dev->descriptor.idProduct != 0xe004) &&
+            (dev->descriptor.idProduct != 0xe008)) {
+                err = -ENODEV;
+                goto out;
+        }
+
+	/*
+         * TI introduced some new handhelds with embedded USB port.
+         * Port advertises same config as SilverLink cable but with a 
+	 * different maximum packet size (64 rather than 32).
+         */
+
+        conf = dev->actconfig;
+        ifdata = conf->interface[0]->cur_altsetting;
+        max_ps = ifdata->endpoint[0].desc.wMaxPacketSize;
+
+        info("max packet size of %d/%d bytes\n",
+             ifdata->endpoint[0].desc.wMaxPacketSize,
+             ifdata->endpoint[1].desc.wMaxPacketSize);
 
 	/*
 	 * Find a tiglusb struct
@@ -390,6 +415,7 @@ tiglusb_probe (struct usb_interface *intf,
 	down (&s->mutex);
 	s->remove_pending = 0;
 	s->dev = dev;
+	s->max_ps = max_ps;
 	up (&s->mutex);
 	dbg ("bound to interface");
 

drivers/usb/misc/tiglusb.h

@@ -17,12 +17,6 @@
  */
 #define MAXTIGL		16
 
-/*
- * Max. packetsize for IN and OUT pipes
- */
-#define BULK_RCV_MAX	32
-#define BULK_SND_MAX	32
-
 /*
  * The driver context...
  */
@@ -42,6 +36,8 @@ typedef struct
 	driver_state_t	state;			/* started/stopped */
 	int		opened;			/* tru if open */
 	int	remove_pending;
+
+	int             max_ps;                 /* max packet size */
 } tiglusb_t, *ptiglusb_t;
 
 #endif

include/linux/ticable.h

@@ -38,5 +38,7 @@
 #define IOCTL_TIUSB_TIMEOUT        _IOW('N', 0x20, int) /* set timeout */
 #define IOCTL_TIUSB_RESET_DEVICE   _IOW('N', 0x21, int) /* reset device */
 #define IOCTL_TIUSB_RESET_PIPES    _IOW('N', 0x22, int) /* reset both pipes*/
+#define IOCTL_TIUSB_GET_MAXPS      _IOR('N', 0x23, int) /* max packet size */
+#define IOCTL_TIUSB_GET_DEVID      _IOR('N', 0x24, int) /* get device type */
 
 #endif /* TICABLE_H */