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@xxxxxxxxx>
---
drivers/staging/line6/pod.c | 96 +++++++++------------------------------------
1 file changed, 19 insertions(+), 77 deletions(-)
diff --git a/drivers/staging/line6/pod.c b/drivers/staging/line6/pod.c
index ba6fed4..74898c3 100644
--- a/drivers/staging/line6/pod.c
+++ b/drivers/staging/line6/pod.c
@@ -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;
+ }
+
+ /* 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;
}
- /* process all remaining messages */
- switch (buf[0]) {
- case LINE6_PARAM_CHANGE | LINE6_CHANNEL_DEVICE:
- case LINE6_PARAM_CHANGE | LINE6_CHANNEL_HOST:
- break;
-
- 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;
}
}
--
1.8.0.2
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