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staging: line6: clean up line6_pod_process_message()

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Previous versions of the line6 driver snooped MIDI traffic in order to
make device state accessible via sysfs attributes.  This involved a lot
of logic in line6_pod_process_message() that has since been removed.

Drop unused conditionals in line6_pod_process_message() and reduce the
levels of indentation.  Only two MIDI messages are still tracked: the
POD version message on startup and monitor level changes originating
from the device.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Hajnoczi 2013-01-19 11:18:43 +01:00 committed by Greg Kroah-Hartman
parent 98115f1df3
commit 4e6a8ffba2
1 changed files with 18 additions and 76 deletions
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94
drivers/staging/line6/pod.c
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@ -135,85 +135,27 @@ void line6_pod_process_message(struct usb_line6_pod *pod)
{
const unsigned char *buf = pod->line6.buffer_message;
/* filter messages by type */
switch (buf[0] & 0xf0) {
case LINE6_PARAM_CHANGE:
case LINE6_PROGRAM_CHANGE:
case LINE6_SYSEX_BEGIN:
break; /* handle these further down */
default:
return; /* ignore all others */
if (memcmp(buf, pod_version_header, sizeof(pod_version_header)) == 0) {
pod->firmware_version = buf[13] * 100 + buf[14] * 10 + buf[15];
pod->device_id = ((int)buf[8] << 16) | ((int)buf[9] << 8) |
(int) buf[10];
pod_startup3(pod);
return;
}
/* process all remaining messages */
switch (buf[0]) {
case LINE6_PARAM_CHANGE | LINE6_CHANNEL_DEVICE:
case LINE6_PARAM_CHANGE | LINE6_CHANNEL_HOST:
break;
/* Only look for sysex messages from this device */
if (buf[0] != (LINE6_SYSEX_BEGIN | LINE6_CHANNEL_DEVICE) &&
buf[0] != (LINE6_SYSEX_BEGIN | LINE6_CHANNEL_UNKNOWN)) {
return;
}
if (memcmp(buf + 1, line6_midi_id, sizeof(line6_midi_id)) != 0) {
return;
}
case LINE6_PROGRAM_CHANGE | LINE6_CHANNEL_DEVICE:
case LINE6_PROGRAM_CHANGE | LINE6_CHANNEL_HOST:
break;
case LINE6_SYSEX_BEGIN | LINE6_CHANNEL_DEVICE:
case LINE6_SYSEX_BEGIN | LINE6_CHANNEL_UNKNOWN:
if (memcmp(buf + 1, line6_midi_id,
sizeof(line6_midi_id)) == 0) {
switch (buf[5]) {
case POD_SYSEX_DUMP:
break;
case POD_SYSEX_SYSTEM:{
short value =
((int)buf[7] << 12) | ((int)buf[8]
<< 8) |
((int)buf[9] << 4) | (int)buf[10];
if (buf[6] == POD_MONITOR_LEVEL)
pod->monitor_level = value;
break;
}
case POD_SYSEX_FINISH:
/* do we need to respond to this? */
break;
case POD_SYSEX_SAVE:
break;
case POD_SYSEX_STORE:
dev_dbg(pod->line6.ifcdev,
"message %02X not yet implemented\n",
buf[5]);
break;
default:
dev_dbg(pod->line6.ifcdev,
"unknown sysex message %02X\n",
buf[5]);
}
} else
if (memcmp
(buf, pod_version_header,
sizeof(pod_version_header)) == 0) {
pod->firmware_version =
buf[13] * 100 + buf[14] * 10 + buf[15];
pod->device_id =
((int)buf[8] << 16) | ((int)buf[9] << 8) | (int)
buf[10];
pod_startup3(pod);
} else
dev_dbg(pod->line6.ifcdev, "unknown sysex header\n");
break;
case LINE6_SYSEX_END:
break;
default:
dev_dbg(pod->line6.ifcdev, "POD: unknown message %02X\n",
buf[0]);
if (buf[5] == POD_SYSEX_SYSTEM && buf[6] == POD_MONITOR_LEVEL) {
short value = ((int)buf[7] << 12) | ((int)buf[8] << 8) |
((int)buf[9] << 4) | (int)buf[10];
pod->monitor_level = value;
}
}