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Diffstat (limited to 'drivers/media/video/bt8xx/bttv-input.c')
-rw-r--r--drivers/media/video/bt8xx/bttv-input.c105
1 files changed, 99 insertions, 6 deletions
diff --git a/drivers/media/video/bt8xx/bttv-input.c b/drivers/media/video/bt8xx/bttv-input.c
index 4b4f6137c6c..e8f60ab58db 100644
--- a/drivers/media/video/bt8xx/bttv-input.c
+++ b/drivers/media/video/bt8xx/bttv-input.c
@@ -140,7 +140,100 @@ static void bttv_input_timer(unsigned long data)
mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
}
-/* ---------------------------------------------------------------*/
+/*
+ * FIXME: Nebula digi uses the legacy way to decode RC5, instead of relying
+ * on the rc-core way. As we need to be sure that both IRQ transitions are
+ * properly triggered, Better to touch it only with this hardware for
+ * testing.
+ */
+
+/* decode raw bit pattern to RC5 code */
+static u32 bttv_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:
+ dprintk(KERN_INFO DEVNAME ":rc5_decode(%x) bad code\n",
+ org_code);
+ return 0;
+ }
+ }
+ dprintk(KERN_INFO DEVNAME ":"
+ "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 bttv_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) {
+ dprintk(KERN_INFO DEVNAME ": spurious timer_end\n");
+ return;
+ }
+
+ if (ir->last_bit < 20) {
+ /* ignore spurious codes (caused by light/other remotes) */
+ dprintk(KERN_INFO DEVNAME ": short code: %x\n", ir->code);
+ } else {
+ ir->code = (ir->code << ir->shift_by) | 1;
+ rc5 = bttv_rc5_decode(ir->code);
+
+ /* two start bits? */
+ if (RC5_START(rc5) != ir->start) {
+ printk(KERN_INFO DEVNAME ":"
+ " 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);
+ dprintk(KERN_INFO DEVNAME ":"
+ " instruction %x, toggle %x\n",
+ instr, toggle);
+ }
+ }
+}
static int bttv_rc5_irq(struct bttv *btv)
{
@@ -206,7 +299,7 @@ static void bttv_ir_start(struct bttv *btv, struct card_ir *ir)
} else if (ir->rc5_gpio) {
/* set timer_end for code completion */
init_timer(&ir->timer_end);
- ir->timer_end.function = ir_rc5_timer_end;
+ ir->timer_end.function = bttv_rc5_timer_end;
ir->timer_end.data = (unsigned long)ir;
ir->shift_by = 1;
ir->start = 3;
@@ -283,10 +376,10 @@ void __devinit init_bttv_i2c_ir(struct bttv *btv)
default:
/*
* The external IR receiver is at i2c address 0x34 (0x35 for
- * reads). Future Hauppauge cards will have an internal
- * receiver at 0x30 (0x31 for reads). In theory, both can be
- * fitted, and Hauppauge suggest an external overrides an
- * internal.
+ * reads). Future Hauppauge cards will have an internal
+ * receiver at 0x30 (0x31 for reads). In theory, both can be
+ * fitted, and Hauppauge suggest an external overrides an
+ * internal.
* That's why we probe 0x1a (~0x34) first. CB
*/