1 files changed, 120 insertions, 0 deletions

diff --git a/drivers/media/rc/ir-functions.c b/drivers/media/rc/ir-functions.c
new file mode 100644
index 00000000000..ec021c92527
--- /dev/null
+++ b/drivers/media/rc/ir-functions.c
@@ -0,0 +1,120 @@
+/*
+ * some common functions to handle infrared remote protocol decoding for
+ * drivers which have not yet been (or can't be) converted to use the
+ * regular protocol decoders...
+ *
+ * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
+ *
+ *  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 <linux/module.h>
+#include <linux/string.h>
+#include <linux/jiffies.h>
+#include <media/ir-common.h>
+#include "ir-core-priv.h"
+
+/* -------------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
+MODULE_LICENSE("GPL");
+
+/* RC5 decoding stuff, moved from bttv-input.c to share it with
+ * saa7134 */
+
+/* decode raw bit pattern to RC5 code */
+static u32 ir_rc5_decode(unsigned int code)
+{
+        unsigned int org_code = code;
+        unsigned int pair;
+        unsigned int rc5 = 0;
+        int i;
+
+        for (i = 0; i < 14; ++i) {
+                pair = code & 0x3;
+                code >>= 2;
+
+                rc5 <<= 1;
+                switch (pair) {
+                case 0:
+                case 2:
+                        break;
+                case 1:
+                        rc5 |= 1;
+                        break;
+                case 3:
+                        IR_dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);
+                        return 0;
+                }
+        }
+        IR_dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
+                "instr=%x\n", rc5, org_code, RC5_START(rc5),
+                RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
+        return rc5;
+}
+
+void ir_rc5_timer_end(unsigned long data)
+{
+        struct card_ir *ir = (struct card_ir *)data;
+        struct timeval tv;
+        unsigned long current_jiffies;
+        u32 gap;
+        u32 rc5 = 0;
+
+        /* get time */
+        current_jiffies = jiffies;
+        do_gettimeofday(&tv);
+
+        /* avoid overflow with gap >1s */
+        if (tv.tv_sec - ir->base_time.tv_sec > 1) {
+                gap = 200000;
+        } else {
+                gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
+                    tv.tv_usec - ir->base_time.tv_usec;
+        }
+
+        /* signal we're ready to start a new code */
+        ir->active = 0;
+
+        /* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
+        if (gap < 28000) {
+                IR_dprintk(1, "ir-common: spurious timer_end\n");
+                return;
+        }
+
+        if (ir->last_bit < 20) {
+                /* ignore spurious codes (caused by light/other remotes) */
+                IR_dprintk(1, "ir-common: short code: %x\n", ir->code);
+        } else {
+                ir->code = (ir->code << ir->shift_by) | 1;
+                rc5 = ir_rc5_decode(ir->code);
+
+                /* two start bits? */
+                if (RC5_START(rc5) != ir->start) {
+                        IR_dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5));
+
+                        /* right address? */
+                } else if (RC5_ADDR(rc5) == ir->addr) {
+                        u32 toggle = RC5_TOGGLE(rc5);
+                        u32 instr = RC5_INSTR(rc5);
+
+                        /* Good code */
+                        ir_keydown(ir->dev, instr, toggle);
+                        IR_dprintk(1, "ir-common: instruction %x, toggle %x\n",
+                                   instr, toggle);
+                }
+        }
+}
+EXPORT_SYMBOL_GPL(ir_rc5_timer_end);