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Date: Thu, 15 Jan 2009 15:41:16 +0100 (CET)
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From: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Subject: [PATCH libiec61883] cmp: replace open-coded channel allocation by
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raw1394_channel_modify
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To: Dan Dennedy <dan@dennedy.org>
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Cc: linux1394-devel@lists.sourceforge.net
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On 15 Jan, Dan Dennedy wrote:
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> On Thu, Jan 1, 2009 at 5:13 AM, Stefan Richter
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> <stefanr@s5r6.in-berlin.de> wrote:
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>> input plug register on the local node? AFAICT neither dvgrab nor kino
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>> use raw1394_channel_modify and raw1394_bandwidth_modify, not even
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>> through libiec61883.)
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>
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> dvgrab indirectly uses channel_modify when you use its -guid option to
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> establish a point-to-point connection.
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>
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Hmm.
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$ dvgrab -guid 0x008088030960484b
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libiec61883 error: Failed to get channels available.
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Established connection over channel 63
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[...proceeds with capture...]
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--------------------------------- 8< ---------------------------------
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cmp: replace open-coded channel allocation by raw1394_channel_modify
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The benefit is that it works on kernel 2.6.30 firewire-core without
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write permission to the IRM's device file (provided that libraw1394 is
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extended for 2.6.30 ioctls too, otherwise it still needs access to the
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IRM's file).
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If I read the code correctly, iec61883_cmp_normalize_output doesn't care
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whether the channel was already allocated by somebody else; it only
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cares that the channel is allocated. That's what the new code does too.
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---
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src/cmp.c | 56 +++++++++---------------------------------------------
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1 file changed, 10 insertions(+), 46 deletions(-)
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Index: libiec61883-1.2.0/src/cmp.c
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===================================================================
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--- libiec61883-1.2.0.orig/src/cmp.c
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+++ libiec61883-1.2.0/src/cmp.c
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@@ -973,55 +973,19 @@ iec61883_cmp_normalize_output (raw1394ha
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DEBUG ("iec61883_cmp_normalize_output: node %d\n", (int) node & 0x3f);
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- // Check for plugs on output
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+ /* Check for plugs on output */
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result = iec61883_get_oMPR (handle, node, &ompr);
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if (result < 0)
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return result;
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- // locate an ouput plug that has a connection
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- for (oplug = 0; oplug < ompr.n_plugs; oplug++) {
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- if (iec61883_get_oPCRX (handle, node, &opcr, oplug) == 0) {
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- if (opcr.online && (opcr.n_p2p_connections > 0 ||
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- opcr.bcast_connection == 1)) {
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+ /* Locate an ouptut plug that has a connection,
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+ * make sure the plug's channel is allocated with IRM */
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+ for (oplug = 0; oplug < ompr.n_plugs; oplug++)
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+ if (iec61883_get_oPCRX (handle, node, &opcr, oplug) == 0
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+ && opcr.online
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+ && (opcr.n_p2p_connections > 0 || opcr.bcast_connection == 1)
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+ && raw1394_channel_modify (handle, opcr.channel, RAW1394_MODIFY_ALLOC) < 0)
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+ DEBUG ("Channel %d already allocated, or can't reach IRM", opcr.channel);
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- // Make sure the plug's channel is allocated with IRM
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- quadlet_t buffer;
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- nodeaddr_t addr = CSR_REGISTER_BASE;
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- unsigned int c = opcr.channel;
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- quadlet_t compare, swap = 0;
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- quadlet_t new;
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-
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- if (c > 31 && c < 64) {
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- addr += CSR_CHANNELS_AVAILABLE_LO;
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- c -= 32;
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- } else if (c < 64)
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- addr += CSR_CHANNELS_AVAILABLE_HI;
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- else
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- FAIL ("Invalid channel");
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- c = 31 - c;
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-
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- result = iec61883_cooked_read (handle, raw1394_get_irm_id (handle), addr,
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- sizeof (quadlet_t), &buffer);
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- if (result < 0)
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- FAIL ("Failed to get channels available.");
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-
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- buffer = ntohl (buffer);
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- DEBUG ("channels available before: 0x%08x", buffer);
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-
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- if ((buffer & (1 << c)) != 0) {
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- swap = htonl (buffer & ~(1 << c));
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- compare = htonl (buffer);
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-
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- result = raw1394_lock (handle, raw1394_get_irm_id (handle), addr,
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- EXTCODE_COMPARE_SWAP, swap, compare, &new;;
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- if ( (result < 0) || (new != compare) ) {
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- FAIL ("Failed to modify channel %d", opcr.channel);
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- }
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- DEBUG ("channels available after: 0x%08x", ntohl (swap));
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- }
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- }
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- }
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- }
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-
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- return result;
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+ return 0;
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}
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--
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Stefan Richter
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-=====-==--= ---= -====
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http://arcgraph.de/sr/
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