#include <media/ir-core.h>
-/* Start time: 4.5 ms */
-#define MIN_START_TIME 3900000
-#define MAX_START_TIME 5100000
+/* Start time: 4.5 ms + 560 us of the next pulse */
+#define MIN_START_TIME (3900000 + 560000)
+#define MAX_START_TIME (5100000 + 560000)
-/* Pulse time: 560 us */
-#define MIN_PULSE_TIME 460000
-#define MAX_PULSE_TIME 660000
+/* Bit 1 time: 2.25ms us */
+#define MIN_BIT1_TIME 2050000
+#define MAX_BIT1_TIME 2450000
-/* Bit 1 space time: 2.25ms-560 us */
-#define MIN_BIT1_TIME 1490000
-#define MAX_BIT1_TIME 1890000
+/* Bit 0 time: 1.12ms us */
+#define MIN_BIT0_TIME 920000
+#define MAX_BIT0_TIME 1320000
-/* Bit 0 space time: 1.12ms-560 us */
-#define MIN_BIT0_TIME 360000
-#define MAX_BIT0_TIME 760000
+/* Total IR code is 110 ms, including the 9 ms for the start pulse */
+#define MAX_NEC_TIME 4000000
+
+/* Total IR code is 110 ms, including the 9 ms for the start pulse */
+#define MIN_REPEAT_TIME 99000000
+#define MAX_REPEAT_TIME 112000000
+
+/* Repeat time: 2.25ms us */
+#define MIN_REPEAT_START_TIME 2050000
+#define MAX_REPEAT_START_TIME 3000000
+
+#define REPEAT_TIME 240 /* ms */
+
+/** is_repeat - Check if it is a NEC repeat event
+ * @input_dev: the struct input_dev descriptor of the device
+ * @pos: the position of the first event
+ * @len: the length of the buffer
+ */
+static int is_repeat(struct ir_raw_event *evs, int len, int pos)
+{
+ if ((evs[pos].delta.tv_nsec < MIN_REPEAT_START_TIME) ||
+ (evs[pos].delta.tv_nsec > MAX_REPEAT_START_TIME))
+ return 0;
+
+ if (++pos >= len)
+ return 0;
+
+ if ((evs[pos].delta.tv_nsec < MIN_REPEAT_TIME) ||
+ (evs[pos].delta.tv_nsec > MAX_REPEAT_TIME))
+ return 0;
+
+ return 1;
+}
/**
* __ir_nec_decode() - Decode one NEC pulsecode
* @evs: event array with type/duration of pulse/space
* @len: length of the array
* @pos: position to start seeking for a code
- * This function returns the decoded ircode or -EINVAL if no pulse got decoded
+ * This function returns -EINVAL if no pulse got decoded,
+ * 0 if buffer is empty and 1 if one keycode were handled.
*/
static int __ir_nec_decode(struct input_dev *input_dev,
struct ir_raw_event *evs,
int len, int *pos)
{
+ struct ir_input_dev *ir = input_get_drvdata(input_dev);
int count = -1;
int ircode = 0, not_code = 0;
/* Be sure that the first event is an start one and is a pulse */
for (; *pos < len; (*pos)++) {
- if (evs[*pos].type & (IR_START_EVENT | IR_PULSE))
+ /* Very long delays are considered as start events */
+ if (evs[*pos].delta.tv_nsec > MAX_NEC_TIME)
break;
- }
- (*pos)++; /* First event doesn't contain data */
+ if (evs[*pos].type & IR_START_EVENT)
+ break;
+ IR_dprintk(1, "%luus: Spurious NEC %s\n",
+ (evs[*pos].delta.tv_nsec + 500) / 1000,
+ (evs[*pos].type & IR_SPACE) ? "space" : "pulse");
+ }
if (*pos >= len)
return 0;
- /* First space should have 4.5 ms otherwise is not NEC protocol */
- if ((evs[*pos].delta.tv_nsec < MIN_START_TIME) |
- (evs[*pos].delta.tv_nsec > MAX_START_TIME) |
- (evs[*pos].type != IR_SPACE))
+ (*pos)++; /* First event doesn't contain data */
+
+ if (evs[*pos].type != IR_PULSE)
goto err;
- /*
- * FIXME: need to implement the repeat sequence
- */
+ /* Check if it is a NEC repeat event */
+ if (is_repeat(evs, len, *pos)) {
+ *pos += 2;
+ if (ir->keypressed) {
+ mod_timer(&ir->raw->timer_keyup,
+ jiffies + msecs_to_jiffies(REPEAT_TIME));
+ IR_dprintk(1, "NEC repeat event\n");
+ return 1;
+ } else {
+ IR_dprintk(1, "missing NEC repeat event\n");
+ return 0;
+ }
+ }
+
+ /* First space should have 4.5 ms otherwise is not NEC protocol */
+ if ((evs[*pos].delta.tv_nsec < MIN_START_TIME) ||
+ (evs[*pos].delta.tv_nsec > MAX_START_TIME))
+ goto err;
count = 0;
for ((*pos)++; *pos < len; (*pos)++) {
int bit;
-
- if ((evs[*pos].delta.tv_nsec < MIN_PULSE_TIME) |
- (evs[*pos].delta.tv_nsec > MAX_PULSE_TIME) |
- (evs[*pos].type != IR_PULSE))
- goto err;
-
- if (++*pos >= len)
- goto err;
- if (evs[*pos].type != IR_SPACE)
- goto err;
-
if ((evs[*pos].delta.tv_nsec > MIN_BIT1_TIME) &&
(evs[*pos].delta.tv_nsec < MAX_BIT1_TIME))
bit = 1;
if (++count == 32)
break;
}
+ *pos++;
/*
* Fixme: may need to accept Extended NEC protocol?
IR_dprintk(1, "NEC scancode 0x%04x\n", ircode);
ir_keydown(input_dev, ircode);
- ir_keyup(input_dev);
+ mod_timer(&ir->raw->timer_keyup,
+ jiffies + msecs_to_jiffies(REPEAT_TIME));
- return ircode;
+ return 1;
err:
- IR_dprintk(1, "NEC decoded failed at bit %d while decoding %luus time\n",
- count, (evs[*pos].delta.tv_nsec + 500) / 1000);
+ IR_dprintk(1, "NEC decoded failed at bit %d (%s) while decoding %luus time\n",
+ count,
+ (evs[*pos].type & IR_SPACE) ? "space" : "pulse",
+ (evs[*pos].delta.tv_nsec + 500) / 1000);
return -EINVAL;
}
int rc = 0;
while (pos < len) {
- if (__ir_nec_decode(input_dev, evs, len, &pos) >= 0)
+ if (__ir_nec_decode(input_dev, evs, len, &pos) > 0)
rc++;
}
projects / ~andy / linux / blobdiff