[PATCH] UEAGLE : add iso support

This patch adds the support for isochronous pipe.

A new module parameter is added to select iso mode.  It is set to iso by
default because bulk mode doesn't work well at high speed rate (>3 Mbps
for upload).

We use UDSL_IGNORE_EILSEQ flags because ADI firmware doesn't reply to
ISO IN when it has nothing to send [1].

[1]
from cypress datasheet :

The ISOSEND0 Bit (bit 7 in the USBPAIR Register) is used when the EZ-USB
FX chip receives an isochronous IN token while the IN FIFO is empty. If
ISOSEND0=0 (the default value), the USB core does not respond to the IN
token. If ISOSEND0=1, the USB core sends a zero-length data packet in
response to the IN token. The action to take depends on the overall
system design. The ISOSEND0 Bit applies to all of the isochronous IN
endpoints, IN-8 through IN-15.

Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/atm/ueagle-atm.c

@@ -68,7 +68,7 @@
 
 #include "usbatm.h"
 
-#define EAGLEUSBVERSION "ueagle 1.1"
+#define EAGLEUSBVERSION "ueagle 1.2"
 
 
 /*
@@ -364,11 +364,14 @@ static const char *chip_name[] = {"ADI930", "Eagle I", "Eagle II", "Eagle III"};
 
 static int modem_index;
 static unsigned int debug;
+static int use_iso[NB_MODEM] = {[0 ... (NB_MODEM - 1)] = 1};
 static int sync_wait[NB_MODEM];
 static char *cmv_file[NB_MODEM];
 
 module_param(debug, uint, 0644);
 MODULE_PARM_DESC(debug, "module debug level (0=off,1=on,2=verbose)");
+module_param_array(use_iso, bool, NULL, 0644);
+MODULE_PARM_DESC(use_iso, "use isochronous usb pipe for incoming traffic");
 module_param_array(sync_wait, bool, NULL, 0644);
 MODULE_PARM_DESC(sync_wait, "wait the synchronisation before starting ATM");
 module_param_array(cmv_file, charp, NULL, 0644);
@@ -936,6 +939,7 @@ static int uea_stat(struct uea_softc *sc)
 	 * ADI930 don't support it (-EPIPE error).
 	 */
 	if (UEA_CHIP_VERSION(sc) != ADI930
+		    && !use_iso[sc->modem_index]
 		    && sc->stats.phy.dsrate != (data >> 16) * 32) {
 		/* Original timming from ADI(used in windows driver)
 		 * 0x20ffff>>16 * 32 = 32 * 32 = 1Mbits
@@ -1659,6 +1663,25 @@ static int uea_bind(struct usbatm_data *usbatm, struct usb_interface *intf,
 	sc->modem_index = (modem_index < NB_MODEM) ? modem_index++ : 0;
 	sc->driver_info = id->driver_info;
 
+	/* ADI930 don't support iso */
+	if (UEA_CHIP_VERSION(id) != ADI930 && use_iso[sc->modem_index]) {
+		int i;
+
+		/* try set fastest alternate for inbound traffic interface */
+		for (i = FASTEST_ISO_INTF; i > 0; i--)
+			if (usb_set_interface(usb, UEA_DS_IFACE_NO, i) == 0)
+				break;
+
+		if (i > 0) {
+			uea_dbg(usb, "set alternate %d for 2 interface\n", i);
+			uea_info(usb, "using iso mode\n");
+			usbatm->flags |= UDSL_USE_ISOC | UDSL_IGNORE_EILSEQ;
+		} else {
+			uea_err(usb, "setting any alternate failed for "
+					"2 interface, using bulk mode\n");
+		}
+	}
+
 	ret = uea_boot(sc);
 	if (ret < 0) {
 		kfree(sc);
@@ -1708,6 +1731,7 @@ static struct usbatm_driver uea_usbatm_driver = {
 	.heavy_init = uea_heavy,
 	.bulk_in = UEA_BULK_DATA_PIPE,
 	.bulk_out = UEA_BULK_DATA_PIPE,
+	.isoc_in = UEA_ISO_DATA_PIPE,
 };
 
 static int uea_probe(struct usb_interface *intf, const struct usb_device_id *id)