This patch adds a workaround for the Dallas chip; the chip tags
its 8bit formats with PCM8 but expects signed data.
--- drivers/usb/audio.c.orig Mon Oct 2 15:23:28 2000
+++ drivers/usb/audio.c Mon Nov 27 00:08:54 2000
@@ -89,6 +89,9 @@
* Somewhat peculiar due to OSS interface limitations. Only works
* for channels where a "slider" is already in front of it (i.e.
* a MIXER unit or a FEATURE unit with volume capability).
+ * 2000-11-26: Thomas Sailer
+ * Workaround for Dallas DS4201. The DS4201 uses PCM8 as format tag for
+ * its 8 bit modes, but expects signed data (and should therefore have used PCM).
*
*/
@@ -1551,6 +1554,7 @@
dev->devnum, u->interface, fmt->altsetting, d->srate, data[0] | (data[1] << 8) | (data[2] << 16)));
d->srate = data[0] | (data[1] << 8) | (data[2] << 16);
}
+ dprintk((KERN_DEBUG "usbaudio: set_format_in: USB format 0x%x, DMA format 0x%x srate %u\n", u->format, d->format, d->srate));
return 0;
}
@@ -1647,6 +1651,7 @@
dev->devnum, u->interface, fmt->altsetting, d->srate, data[0] | (data[1] << 8) | (data[2] << 16)));
d->srate = data[0] | (data[1] << 8) | (data[2] << 16);
}
+ dprintk((KERN_DEBUG "usbaudio: set_format_out: USB format 0x%x, DMA format 0x%x srate %u\n", u->format, d->format, d->srate));
return 0;
}
@@ -2851,6 +2856,9 @@
continue;
}
format = (fmt[5] == 2) ? (AFMT_U16_LE | AFMT_U8) : (AFMT_S16_LE | AFMT_S8);
+ /* Dallas DS4201 workaround */
+ if (dev->descriptor.idVendor == 0x04fa && dev->descriptor.idProduct == 0x4201)
+ format = (AFMT_S16_LE | AFMT_S8);
fmt = find_csinterface_descriptor(buffer, buflen, NULL, FORMAT_TYPE, asifout, i);
if (!fmt) {
printk(KERN_ERR "usbaudio: device %u interface %u altsetting %u FORMAT_TYPE descriptor not found\n",