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path: root/drivers/media/rc/ir-rc5-decoder.c
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Diffstat (limited to 'drivers/media/rc/ir-rc5-decoder.c')
-rw-r--r--drivers/media/rc/ir-rc5-decoder.c85
1 files changed, 49 insertions, 36 deletions
diff --git a/drivers/media/rc/ir-rc5-decoder.c b/drivers/media/rc/ir-rc5-decoder.c
index 4295d9b250c8..2ef763928ca4 100644
--- a/drivers/media/rc/ir-rc5-decoder.c
+++ b/drivers/media/rc/ir-rc5-decoder.c
@@ -1,6 +1,7 @@
-/* ir-rc5-decoder.c - handle RC5(x) IR Pulse/Space protocol
+/* ir-rc5-decoder.c - decoder for RC5(x) and StreamZap protocols
*
* Copyright (C) 2010 by Mauro Carvalho Chehab
+ * Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com>
*
* 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
@@ -13,23 +14,22 @@
*/
/*
- * This code handles 14 bits RC5 protocols and 20 bits RC5x protocols.
- * There are other variants that use a different number of bits.
- * This is currently unsupported.
- * It considers a carrier of 36 kHz, with a total of 14/20 bits, where
- * the first two bits are start bits, and a third one is a filing bit
+ * This decoder handles the 14 bit RC5 protocol, 15 bit "StreamZap" protocol
+ * and 20 bit RC5x protocol.
*/
#include "rc-core-priv.h"
#include <linux/module.h>
#define RC5_NBITS 14
+#define RC5_SZ_NBITS 15
#define RC5X_NBITS 20
#define CHECK_RC5X_NBITS 8
#define RC5_UNIT 888888 /* ns */
#define RC5_BIT_START (1 * RC5_UNIT)
#define RC5_BIT_END (1 * RC5_UNIT)
#define RC5X_SPACE (4 * RC5_UNIT)
+#define RC5_TRAILER (10 * RC5_UNIT) /* In reality, approx 100 */
enum rc5_state {
STATE_INACTIVE,
@@ -51,8 +51,9 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
struct rc5_dec *data = &dev->raw->rc5;
u8 toggle;
u32 scancode;
+ enum rc_type protocol;
- if (!rc_protocols_enabled(dev, RC_BIT_RC5 | RC_BIT_RC5X))
+ if (!(dev->enabled_protocols & (RC_BIT_RC5 | RC_BIT_RC5X)))
return 0;
if (!is_timing_event(ev)) {
@@ -65,7 +66,7 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
goto out;
again:
- IR_dprintk(2, "RC5(x) decode started at state %i (%uus %s)\n",
+ IR_dprintk(2, "RC5(x/sz) decode started at state %i (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
@@ -79,12 +80,15 @@ again:
data->state = STATE_BIT_START;
data->count = 1;
- /* We just need enough bits to get to STATE_CHECK_RC5X */
- data->wanted_bits = RC5X_NBITS;
decrease_duration(&ev, RC5_BIT_START);
goto again;
case STATE_BIT_START:
+ if (!ev.pulse && geq_margin(ev.duration, RC5_TRAILER, RC5_UNIT / 2)) {
+ data->state = STATE_FINISHED;
+ goto again;
+ }
+
if (!eq_margin(ev.duration, RC5_BIT_START, RC5_UNIT / 2))
break;
@@ -99,9 +103,7 @@ again:
if (!is_transition(&ev, &dev->raw->prev_ev))
break;
- if (data->count == data->wanted_bits)
- data->state = STATE_FINISHED;
- else if (data->count == CHECK_RC5X_NBITS)
+ if (data->count == CHECK_RC5X_NBITS)
data->state = STATE_CHECK_RC5X;
else
data->state = STATE_BIT_START;
@@ -111,13 +113,10 @@ again:
case STATE_CHECK_RC5X:
if (!ev.pulse && geq_margin(ev.duration, RC5X_SPACE, RC5_UNIT / 2)) {
- /* RC5X */
- data->wanted_bits = RC5X_NBITS;
+ data->is_rc5x = true;
decrease_duration(&ev, RC5X_SPACE);
- } else {
- /* RC5 */
- data->wanted_bits = RC5_NBITS;
- }
+ } else
+ data->is_rc5x = false;
data->state = STATE_BIT_START;
goto again;
@@ -125,10 +124,10 @@ again:
if (ev.pulse)
break;
- if (data->wanted_bits == RC5X_NBITS) {
+ if (data->is_rc5x && data->count == RC5X_NBITS) {
/* RC5X */
u8 xdata, command, system;
- if (!rc_protocols_enabled(dev, RC_BIT_RC5X)) {
+ if (!(dev->enabled_protocols & RC_BIT_RC5X)) {
data->state = STATE_INACTIVE;
return 0;
}
@@ -138,14 +137,12 @@ again:
toggle = (data->bits & 0x20000) ? 1 : 0;
command += (data->bits & 0x01000) ? 0 : 0x40;
scancode = system << 16 | command << 8 | xdata;
+ protocol = RC_TYPE_RC5X;
- IR_dprintk(1, "RC5X scancode 0x%06x (toggle: %u)\n",
- scancode, toggle);
-
- } else {
+ } else if (!data->is_rc5x && data->count == RC5_NBITS) {
/* RC5 */
u8 command, system;
- if (!rc_protocols_enabled(dev, RC_BIT_RC5)) {
+ if (!(dev->enabled_protocols & RC_BIT_RC5)) {
data->state = STATE_INACTIVE;
return 0;
}
@@ -154,25 +151,41 @@ again:
toggle = (data->bits & 0x00800) ? 1 : 0;
command += (data->bits & 0x01000) ? 0 : 0x40;
scancode = system << 8 | command;
+ protocol = RC_TYPE_RC5;
- IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n",
- scancode, toggle);
- }
+ } else if (!data->is_rc5x && data->count == RC5_SZ_NBITS) {
+ /* RC5 StreamZap */
+ u8 command, system;
+ if (!(dev->enabled_protocols & RC_BIT_RC5_SZ)) {
+ data->state = STATE_INACTIVE;
+ return 0;
+ }
+ command = (data->bits & 0x0003F) >> 0;
+ system = (data->bits & 0x02FC0) >> 6;
+ toggle = (data->bits & 0x01000) ? 1 : 0;
+ scancode = system << 6 | command;
+ protocol = RC_TYPE_RC5_SZ;
- rc_keydown(dev, scancode, toggle);
+ } else
+ break;
+
+ IR_dprintk(1, "RC5(x/sz) scancode 0x%06x (p: %u, t: %u)\n",
+ scancode, protocol, toggle);
+
+ rc_keydown(dev, protocol, scancode, toggle);
data->state = STATE_INACTIVE;
return 0;
}
out:
- IR_dprintk(1, "RC5(x) decode failed at state %i (%uus %s)\n",
- data->state, TO_US(ev.duration), TO_STR(ev.pulse));
+ IR_dprintk(1, "RC5(x/sz) decode failed at state %i count %d (%uus %s)\n",
+ data->state, data->count, TO_US(ev.duration), TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
return -EINVAL;
}
static struct ir_raw_handler rc5_handler = {
- .protocols = RC_BIT_RC5 | RC_BIT_RC5X,
+ .protocols = RC_BIT_RC5 | RC_BIT_RC5X | RC_BIT_RC5_SZ,
.decode = ir_rc5_decode,
};
@@ -180,7 +193,7 @@ static int __init ir_rc5_decode_init(void)
{
ir_raw_handler_register(&rc5_handler);
- printk(KERN_INFO "IR RC5(x) protocol handler initialized\n");
+ printk(KERN_INFO "IR RC5(x/sz) protocol handler initialized\n");
return 0;
}
@@ -193,6 +206,6 @@ module_init(ir_rc5_decode_init);
module_exit(ir_rc5_decode_exit);
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Mauro Carvalho Chehab");
+MODULE_AUTHOR("Mauro Carvalho Chehab and Jarod Wilson");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
-MODULE_DESCRIPTION("RC5(x) IR protocol decoder");
+MODULE_DESCRIPTION("RC5(x/sz) IR protocol decoder");
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