Ticket #285: sa3250ch.patch

contrib/README.sa3250ch

@@ +1 @@
+sa3250ch is a small program that changes channels on a Scientific Atlanta
+SA3250HD cable box via a 1394 (aka. Firewire) connection. It is based off
+of 6200ch by Stacey Son (mythdev@son.org).
+
+To use this with mythtv do the following:
+
+(1) Make sure you have 1394/Firewire drivers installed in your kernel.
+
+(2) Install libraw1394, librom1394 and libavc1394.
+
+(3) Compile and install "sa3250ch":
+
+      # cc -o sa3250ch sa3250ch.c -lrom1394 -lavc1394 -lraw1394
+      # cp sa3250ch /usr/local/bin
+
+(4) Connect a 1394/Firewire cable from your computer to your SA3250HD and test:
+
+      # sa3250ch <your_favorite_channel_number>
+
+(5) Configure Mythtv to use the channel changer by running the "setup" program and adding to "/usr/local/bin/sa3250ch" to the "External channel change command" field under "Connect source to Input".
+
+I'm curious if this works for anybody on other SciAtl boxes when the proper
+model IDs are added.
+
+Matt Porter <mporter@kernel.crashing.org>

contrib/sa3250ch.c

@@ +1 @@
+/*
+ * sa3250ch - an external channel changer for SA3250HD Tuner 
+ * Based off 6200ch.c by Stacey D. Son
+ * 
+ * Copyright 2004,2005 by Stacey D. Son <mythdev@son.org> 
+ * Copyright 2005 Matt Porter <mporter@kernel.crashing.org>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <libavc1394/rom1394.h>
+#include <libavc1394/avc1394.h>
+#include <libraw1394/raw1394.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+
+/* SA3250HD IDs */
+#define SA3250HD_VENDOR_ID      0x000011e6
+#define SA3250HD_MODEL_ID       0x00000be0
+
+#define AVC1394_SA3250_COMMAND_CHANNEL 0x000007c00   /* subunit command */
+#define AVC1394_SA3250_OPERAND_KEY_PRESS 0xe7
+#define AVC1394_SA3250_OPERAND_KEY_RELEASE 0x67 
+
+#define CTL_CMD0 AVC1394_CTYPE_CONTROL | AVC1394_SUBUNIT_TYPE_PANEL | \
+        AVC1394_SUBUNIT_ID_0 | AVC1394_SA3250_COMMAND_CHANNEL
+#define CTL_CMD1 (0x04 << 24)
+#define CTL_CMD2 0xff000000
+
+#define STARTING_NODE 0
+
+void usage()
+{
+   fprintf(stderr, "Usage: sa3250ch [-v] <channel_num>\n");
+   exit(1);
+}
+
+int main (int argc, char *argv[])
+{
+   rom1394_directory dir;
+   int device = -1;
+   int i;
+   int verbose = 0;
+   quadlet_t cmd[3];
+   int dig[3];
+   int chn = 708;
+
+   if (argc < 2) 
+      usage();
+
+   if (argc == 3 && argv[1][0] == '-' && argv[1][1] == 'v') {
+      verbose = 1;
+      chn = atoi(argv[2]);
+   } else {
+      chn = atoi(argv[1]);
+   }
+
+#ifdef RAW1394_V_0_8
+   raw1394handle_t handle = raw1394_get_handle();
+#else
+   raw1394handle_t handle = raw1394_new_handle();
+#endif
+
+   if (!handle) {
+      if (!errno) {
+         fprintf(stderr, "Not Compatible!\n");
+      } else {
+         perror("Couldn't get 1394 handle");
+         fprintf(stderr, "Is ieee1394, driver, and raw1394 loaded?\n");
+      }
+      exit(1);
+   } 
+
+   if (raw1394_set_port(handle, 0) < 0) {
+      perror("couldn't set port");
+      raw1394_destroy_handle(handle);
+      exit(1);
+   }
+
+   int nc = raw1394_get_nodecount(handle);
+   for (i=STARTING_NODE; i < nc; ++i) {
+      if (rom1394_get_directory(handle, i, &dir) < 0) {
+         fprintf(stderr,"error reading config rom directory for node %d\n", i);
+         raw1394_destroy_handle(handle);
+         exit(1);
+      }
+
+      if (verbose) 
+         printf("node %d: vendor_id = 0x%08x model_id = 0x%08x\n", 
+                 i, dir.vendor_id, dir.model_id); 
+                
+      if ((dir.vendor_id == SA3250HD_VENDOR_ID)  &&
+          (dir.model_id == SA3250HD_MODEL_ID)) {
+            device = i;
+            break;
+      }
+   }
+    
+   if (device == -1) {
+        fprintf(stderr, "Could not find SA3250HD on the 1394 bus.\n");
+        raw1394_destroy_handle(handle);
+        exit(1);
+   }
+
+   dig[2] = 0x30 | (chn % 10);
+   dig[1] = 0x30 | ((chn % 100)  / 10);
+   dig[0] = 0x30 | ((chn % 1000) / 100);
+
+   cmd[0] = CTL_CMD0 | AVC1394_SA3250_OPERAND_KEY_PRESS;
+   cmd[1] = CTL_CMD1 | (dig[0] << 16) | (dig[1] << 8) | dig[2];
+   cmd[2] = CTL_CMD2;
+
+   if (verbose)
+      printf("AV/C Command: %d%d%d = cmd0=0x%08x cmd2=0x%08x cmd3=0x%08x\n", 
+            dig[0] & 0xf, dig[1] & 0xf, dig[2] & 0xf, cmd[0], cmd[1], cmd[2]);
+
+   avc1394_transaction_block(handle, 0, cmd, 3, 1);
+   cmd[0] = CTL_CMD0 | AVC1394_SA3250_OPERAND_KEY_RELEASE;
+
+   if (verbose)
+      printf("AV/C Command: %d%d%d = cmd0=0x%08x cmd2=0x%08x cmd3=0x%08x\n", 
+            dig[0] & 0xf, dig[1] & 0xf, dig[2] & 0xf, cmd[0], cmd[1], cmd[2]);
+
+   avc1394_transaction_block(handle, 0, cmd, 3, 1);
+
+   raw1394_destroy_handle(handle);
+
+   exit(0);
+}