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V4L/DVB: ir-core: change duration to be coded as a u32 integer

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This patch implements the agreed upon 1:31 integer encoded pulse/duration
struct for ir-core raw decoders. All decoders have been tested after the
change. Comments are welcome.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
David Härdeman 2010-04-15 18:46:00 -03:00 committed by Mauro Carvalho Chehab
parent 21677cfc56
commit e40b1127f9
6 changed files with 283 additions and 254 deletions
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47
drivers/media/IR/ir-core-priv.h
View File

@ -22,7 +22,7 @@
struct ir_raw_handler {
struct list_head list;
int (*decode)(struct input_dev *input_dev, s64 duration);
int (*decode)(struct input_dev *input_dev, struct ir_raw_event event);
int (*raw_register)(struct input_dev *input_dev);
int (*raw_unregister)(struct input_dev *input_dev);
};
@ -36,26 +36,28 @@ struct ir_raw_event_ctrl {
};
/* macros for IR decoders */
#define PULSE(units) ((units))
#define SPACE(units) (-(units))
#define IS_RESET(duration) ((duration) == 0)
#define IS_PULSE(duration) ((duration) > 0)
#define IS_SPACE(duration) ((duration) < 0)
#define DURATION(duration) (abs((duration)))
#define IS_TRANSITION(x, y) ((x) * (y) < 0)
#define DECREASE_DURATION(duration, amount) \
do { \
if (IS_SPACE(duration)) \
duration += (amount); \
else if (IS_PULSE(duration)) \
duration -= (amount); \
} while (0)
static inline bool geq_margin(unsigned d1, unsigned d2, unsigned margin) {
return d1 > (d2 - margin);
}
#define TO_UNITS(duration, unit_len) \
((int)((duration) > 0 ? \
DIV_ROUND_CLOSEST(abs((duration)), (unit_len)) :\
-DIV_ROUND_CLOSEST(abs((duration)), (unit_len))))
#define TO_US(duration) ((int)TO_UNITS(duration, 1000))
static inline bool eq_margin(unsigned d1, unsigned d2, unsigned margin) {
return ((d1 > (d2 - margin)) && (d1 < (d2 + margin)));
}
static inline bool is_transition(struct ir_raw_event *x, struct ir_raw_event *y) {
return x->pulse != y->pulse;
}
static inline void decrease_duration(struct ir_raw_event *ev, unsigned duration) {
if (duration > ev->duration)
ev->duration = 0;
else
ev->duration -= duration;
}
#define TO_US(duration) (((duration) + 500) / 1000)
#define TO_STR(is_pulse) ((is_pulse) ? "pulse" : "space")
#define IS_RESET(ev) (ev.duration == 0)
/*
* Routines from ir-sysfs.c - Meant to be called only internally inside
@ -70,11 +72,6 @@ void ir_unregister_class(struct input_dev *input_dev);
*/
int ir_raw_event_register(struct input_dev *input_dev);
void ir_raw_event_unregister(struct input_dev *input_dev);
static inline void ir_raw_event_reset(struct input_dev *input_dev)
{
ir_raw_event_store(input_dev, 0);
ir_raw_event_handle(input_dev);
}
int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
void ir_raw_init(void);

120
drivers/media/IR/ir-nec-decoder.c
View File

@ -17,13 +17,15 @@
#define NEC_NBITS 32
#define NEC_UNIT 562500 /* ns */
#define NEC_HEADER_PULSE PULSE(16)
#define NECX_HEADER_PULSE PULSE(8) /* Less common NEC variant */
#define NEC_HEADER_SPACE SPACE(8)
#define NEC_REPEAT_SPACE SPACE(4)
#define NEC_BIT_PULSE PULSE(1)
#define NEC_BIT_0_SPACE SPACE(1)
#define NEC_BIT_1_SPACE SPACE(3)
#define NEC_HEADER_PULSE (16 * NEC_UNIT)
#define NECX_HEADER_PULSE (8 * NEC_UNIT) /* Less common NEC variant */
#define NEC_HEADER_SPACE (8 * NEC_UNIT)
#define NEC_REPEAT_SPACE (8 * NEC_UNIT)
#define NEC_BIT_PULSE (1 * NEC_UNIT)
#define NEC_BIT_0_SPACE (1 * NEC_UNIT)
#define NEC_BIT_1_SPACE (3 * NEC_UNIT)
#define NEC_TRAILER_PULSE (1 * NEC_UNIT)
#define NEC_TRAILER_SPACE (10 * NEC_UNIT) /* even longer in reality */
/* Used to register nec_decoder clients */
static LIST_HEAD(decoder_list);
@ -119,15 +121,14 @@ static struct attribute_group decoder_attribute_group = {
/**
* ir_nec_decode() - Decode one NEC pulse or space
* @input_dev: the struct input_dev descriptor of the device
* @duration: duration in ns of pulse/space
* @duration: the struct ir_raw_event descriptor of the pulse/space
*
* This function returns -EINVAL if the pulse violates the state machine
*/
static int ir_nec_decode(struct input_dev *input_dev, s64 duration)
static int ir_nec_decode(struct input_dev *input_dev, struct ir_raw_event ev)
{
struct decoder_data *data;
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
int u;
u32 scancode;
u8 address, not_address, command, not_command;
@ -138,59 +139,88 @@ static int ir_nec_decode(struct input_dev *input_dev, s64 duration)
if (!data->enabled)
return 0;
if (IS_RESET(duration)) {
if (IS_RESET(ev)) {
data->state = STATE_INACTIVE;
return 0;
}
u = TO_UNITS(duration, NEC_UNIT);
if (DURATION(u) == 0)
goto out;
IR_dprintk(2, "NEC decode started at state %d (%i units, %ius)\n",
data->state, u, TO_US(duration));
IR_dprintk(2, "NEC decode started at state %d (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
switch (data->state) {
case STATE_INACTIVE:
if (u == NEC_HEADER_PULSE || u == NECX_HEADER_PULSE) {
data->count = 0;
data->state = STATE_HEADER_SPACE;
}
if (!ev.pulse)
break;
if (!eq_margin(ev.duration, NEC_HEADER_PULSE, NEC_UNIT / 2) &&
!eq_margin(ev.duration, NECX_HEADER_PULSE, NEC_UNIT / 2))
break;
data->count = 0;
data->state = STATE_HEADER_SPACE;
return 0;
case STATE_HEADER_SPACE:
if (u == NEC_HEADER_SPACE) {
if (ev.pulse)
break;
if (eq_margin(ev.duration, NEC_HEADER_SPACE, NEC_UNIT / 2)) {
data->state = STATE_BIT_PULSE;
return 0;
} else if (u == NEC_REPEAT_SPACE) {
} else if (eq_margin(ev.duration, NEC_REPEAT_SPACE, NEC_UNIT / 2)) {
ir_repeat(input_dev);
IR_dprintk(1, "Repeat last key\n");
data->state = STATE_TRAILER_PULSE;
return 0;
}
break;
case STATE_BIT_PULSE:
if (u == NEC_BIT_PULSE) {
data->state = STATE_BIT_SPACE;
return 0;
}
break;
if (!ev.pulse)
break;
if (!eq_margin(ev.duration, NEC_BIT_PULSE, NEC_UNIT / 2))
break;
data->state = STATE_BIT_SPACE;
return 0;
case STATE_BIT_SPACE:
if (u != NEC_BIT_0_SPACE && u != NEC_BIT_1_SPACE)
if (ev.pulse)
break;
data->nec_bits <<= 1;
if (u == NEC_BIT_1_SPACE)
if (eq_margin(ev.duration, NEC_BIT_1_SPACE, NEC_UNIT / 2))
data->nec_bits |= 1;
else if (!eq_margin(ev.duration, NEC_BIT_0_SPACE, NEC_UNIT / 2))
break;
data->count++;
if (data->count != NEC_NBITS) {
if (data->count == NEC_NBITS)
data->state = STATE_TRAILER_PULSE;
else
data->state = STATE_BIT_PULSE;
return 0;
}
return 0;
case STATE_TRAILER_PULSE:
if (!ev.pulse)
break;
if (!eq_margin(ev.duration, NEC_TRAILER_PULSE, NEC_UNIT / 2))
break;
data->state = STATE_TRAILER_SPACE;
return 0;
case STATE_TRAILER_SPACE:
if (ev.pulse)
break;
if (!geq_margin(ev.duration, NEC_TRAILER_SPACE, NEC_UNIT / 2))
break;
address = bitrev8((data->nec_bits >> 24) & 0xff);
not_address = bitrev8((data->nec_bits >> 16) & 0xff);
@ -210,34 +240,18 @@ static int ir_nec_decode(struct input_dev *input_dev, s64 duration)
command;
IR_dprintk(1, "NEC (Ext) scancode 0x%06x\n", scancode);
} else {
/* normal NEC */
/* Normal NEC */
scancode = address << 8 | command;
IR_dprintk(1, "NEC scancode 0x%04x\n", scancode);
}
ir_keydown(input_dev, scancode, 0);
data->state = STATE_TRAILER_PULSE;
data->state = STATE_INACTIVE;
return 0;
case STATE_TRAILER_PULSE:
if (u > 0) {
data->state = STATE_TRAILER_SPACE;
return 0;
}
break;
case STATE_TRAILER_SPACE:
if (u < 0) {
data->state = STATE_INACTIVE;
return 0;
}
break;
}
out:
IR_dprintk(1, "NEC decode failed at state %d (%i units, %ius)\n",
data->state, u, TO_US(duration));
IR_dprintk(1, "NEC decode failed at state %d (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
return -EINVAL;
}

30
drivers/media/IR/ir-raw-event.c
View File

@ -57,12 +57,12 @@ static struct work_struct wq_load;
static void ir_raw_event_work(struct work_struct *work)
{
s64 d;
struct ir_raw_event ev;
struct ir_raw_event_ctrl *raw =
container_of(work, struct ir_raw_event_ctrl, rx_work);
while (kfifo_out(&raw->kfifo, &d, sizeof(d)) == sizeof(d))
RUN_DECODER(decode, raw->input_dev, d);
while (kfifo_out(&raw->kfifo, &ev, sizeof(ev)) == sizeof(ev))
RUN_DECODER(decode, raw->input_dev, ev);
}
int ir_raw_event_register(struct input_dev *input_dev)
@ -114,21 +114,21 @@ void ir_raw_event_unregister(struct input_dev *input_dev)
/**
* ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders
* @input_dev: the struct input_dev device descriptor
* @duration: duration of the pulse or space in ns
* @ev: the struct ir_raw_event descriptor of the pulse/space
*
* This routine (which may be called from an interrupt context) stores a
* pulse/space duration for the raw ir decoding state machines. Pulses are
* signalled as positive values and spaces as negative values. A zero value
* will reset the decoding state machines.
*/
int ir_raw_event_store(struct input_dev *input_dev, s64 duration)
int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev)
{
struct ir_input_dev *ir = input_get_drvdata(input_dev);
if (!ir->raw)
return -EINVAL;
if (kfifo_in(&ir->raw->kfifo, &duration, sizeof(duration)) != sizeof(duration))
if (kfifo_in(&ir->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev))
return -ENOMEM;
return 0;
@ -151,6 +151,7 @@ int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type typ
struct ir_input_dev *ir = input_get_drvdata(input_dev);
ktime_t now;
s64 delta; /* ns */
struct ir_raw_event ev;
int rc = 0;
if (!ir->raw)
@ -163,16 +164,21 @@ int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type typ
* being called for the first time, note that delta can't
* possibly be negative.
*/
if (delta > NSEC_PER_SEC || !ir->raw->last_type)
ev.duration = 0;
if (delta > IR_MAX_DURATION || !ir->raw->last_type)
type |= IR_START_EVENT;
else
ev.duration = delta;
if (type & IR_START_EVENT)
ir_raw_event_reset(input_dev);
else if (ir->raw->last_type & IR_SPACE)
rc = ir_raw_event_store(input_dev, -delta);
else if (ir->raw->last_type & IR_PULSE)
rc = ir_raw_event_store(input_dev, delta);
else
else if (ir->raw->last_type & IR_SPACE) {
ev.pulse = false;
rc = ir_raw_event_store(input_dev, &ev);
} else if (ir->raw->last_type & IR_PULSE) {
ev.pulse = true;
rc = ir_raw_event_store(input_dev, &ev);
} else
return 0;
ir->raw->last_event = now;

101
drivers/media/IR/ir-rc5-decoder.c
View File

@ -25,8 +25,10 @@
#define RC5_NBITS 14
#define RC5X_NBITS 20
#define CHECK_RC5X_NBITS 8
#define RC5X_SPACE SPACE(4)
#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)
/* Used to register rc5_decoder clients */
static LIST_HEAD(decoder_list);
@ -48,7 +50,7 @@ struct decoder_data {
/* State machine control */
enum rc5_state state;
u32 rc5_bits;
int last_unit;
struct ir_raw_event prev_ev;
unsigned count;
unsigned wanted_bits;
};
@ -124,17 +126,16 @@ static struct attribute_group decoder_attribute_group = {
/**
* ir_rc5_decode() - Decode one RC-5 pulse or space
* @input_dev: the struct input_dev descriptor of the device
* @duration: duration of pulse/space in ns
* @ev: the struct ir_raw_event descriptor of the pulse/space
*
* This function returns -EINVAL if the pulse violates the state machine
*/
static int ir_rc5_decode(struct input_dev *input_dev, s64 duration)
static int ir_rc5_decode(struct input_dev *input_dev, struct ir_raw_event ev)
{
struct decoder_data *data;
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
u8 toggle;
u32 scancode;
int u;
data = get_decoder_data(ir_dev);
if (!data)
@ -143,76 +144,65 @@ static int ir_rc5_decode(struct input_dev *input_dev, s64 duration)
if (!data->enabled)
return 0;
if (IS_RESET(duration)) {
if (IS_RESET(ev)) {
data->state = STATE_INACTIVE;
return 0;
}
u = TO_UNITS(duration, RC5_UNIT);
if (DURATION(u) == 0)
if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
goto out;
again:
IR_dprintk(2, "RC5(x) decode started at state %i (%i units, %ius)\n",
data->state, u, TO_US(duration));
IR_dprintk(2, "RC5(x) decode started at state %i (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
if (DURATION(u) == 0 && data->state != STATE_FINISHED)
if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
return 0;
switch (data->state) {
case STATE_INACTIVE:
if (IS_PULSE(u)) {
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(u, 1);
goto again;
}
break;
if (!ev.pulse)
break;
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 (DURATION(u) == 1) {
data->rc5_bits <<= 1;
if (IS_SPACE(u))
data->rc5_bits |= 1;
data->count++;
data->last_unit = u;
if (!eq_margin(ev.duration, RC5_BIT_START, RC5_UNIT / 2))
break;
/*
* If the last bit is zero, a space will merge
* with the silence after the command.
*/
if (IS_PULSE(u) && data->count == data->wanted_bits) {
data->state = STATE_FINISHED;
goto again;
}
data->state = STATE_BIT_END;
return 0;
}
break;
data->rc5_bits <<= 1;
if (!ev.pulse)
data->rc5_bits |= 1;
data->count++;
data->prev_ev = ev;
data->state = STATE_BIT_END;
return 0;
case STATE_BIT_END:
if (IS_TRANSITION(u, data->last_unit)) {
if (data->count == data->wanted_bits)
data->state = STATE_FINISHED;
else if (data->count == CHECK_RC5X_NBITS)
data->state = STATE_CHECK_RC5X;
else
data->state = STATE_BIT_START;
if (!is_transition(&ev, &data->prev_ev))
break;
DECREASE_DURATION(u, 1);
goto again;
}
break;
if (data->count == data->wanted_bits)
data->state = STATE_FINISHED;
else if (data->count == CHECK_RC5X_NBITS)
data->state = STATE_CHECK_RC5X;
else
data->state = STATE_BIT_START;
decrease_duration(&ev, RC5_BIT_END);
goto again;
case STATE_CHECK_RC5X:
if (IS_SPACE(u) && DURATION(u) >= DURATION(RC5X_SPACE)) {
if (!ev.pulse && geq_margin(ev.duration, RC5X_SPACE, RC5_UNIT / 2)) {
/* RC5X */
data->wanted_bits = RC5X_NBITS;
DECREASE_DURATION(u, DURATION(RC5X_SPACE));
decrease_duration(&ev, RC5X_SPACE);
} else {
/* RC5 */
data->wanted_bits = RC5_NBITS;
@ -221,6 +211,9 @@ again:
goto again;
case STATE_FINISHED:
if (ev.pulse)
break;
if (data->wanted_bits == RC5X_NBITS) {
/* RC5X */
u8 xdata, command, system;
@ -253,8 +246,8 @@ again:
}
out:
IR_dprintk(1, "RC5(x) decode failed at state %i (%i units, %ius)\n",
data->state, u, TO_US(duration));
IR_dprintk(1, "RC5(x) decode failed at state %i (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
return -EINVAL;
}

221
drivers/media/IR/ir-rc6-decoder.c
View File

@ -26,8 +26,12 @@
#define RC6_0_NBITS 16
#define RC6_6A_SMALL_NBITS 24
#define RC6_6A_LARGE_NBITS 32
#define RC6_PREFIX_PULSE PULSE(6)
#define RC6_PREFIX_SPACE SPACE(2)
#define RC6_PREFIX_PULSE (6 * RC6_UNIT)
#define RC6_PREFIX_SPACE (2 * RC6_UNIT)
#define RC6_BIT_START (1 * RC6_UNIT)
#define RC6_BIT_END (1 * RC6_UNIT)
#define RC6_TOGGLE_START (2 * RC6_UNIT)
#define RC6_TOGGLE_END (2 * RC6_UNIT)
#define RC6_MODE_MASK 0x07 /* for the header bits */
#define RC6_STARTBIT_MASK 0x08 /* for the header bits */
#define RC6_6A_MCE_TOGGLE_MASK 0x8000 /* for the body bits */
@ -63,7 +67,7 @@ struct decoder_data {
enum rc6_state state;
u8 header;
u32 body;
int last_unit;
struct ir_raw_event prev_ev;
bool toggle;
unsigned count;
unsigned wanted_bits;
@ -152,17 +156,16 @@ static enum rc6_mode rc6_mode(struct decoder_data *data) {
/**
* ir_rc6_decode() - Decode one RC6 pulse or space
* @input_dev: the struct input_dev descriptor of the device
* @duration: duration of pulse/space in ns
* @ev: the struct ir_raw_event descriptor of the pulse/space
*
* This function returns -EINVAL if the pulse violates the state machine
*/
static int ir_rc6_decode(struct input_dev *input_dev, s64 duration)
static int ir_rc6_decode(struct input_dev *input_dev, struct ir_raw_event ev)
{
struct decoder_data *data;
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
u32 scancode;
u8 toggle;
int u;
data = get_decoder_data(ir_dev);
if (!data)
@ -171,140 +174,144 @@ static int ir_rc6_decode(struct input_dev *input_dev, s64 duration)
if (!data->enabled)
return 0;
if (IS_RESET(duration)) {
if (IS_RESET(ev)) {
data->state = STATE_INACTIVE;
return 0;
}
u = TO_UNITS(duration, RC6_UNIT);
if (DURATION(u) == 0)
if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
goto out;
again:
IR_dprintk(2, "RC6 decode started at state %i (%i units, %ius)\n",
data->state, u, TO_US(duration));
IR_dprintk(2, "RC6 decode started at state %i (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
if (DURATION(u) == 0 && data->state != STATE_FINISHED)
if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
return 0;
switch (data->state) {
case STATE_INACTIVE:
if (u >= RC6_PREFIX_PULSE - 1 && u <= RC6_PREFIX_PULSE + 1) {
data->state = STATE_PREFIX_SPACE;
data->count = 0;
return 0;
}
break;
if (!ev.pulse)
break;
/* Note: larger margin on first pulse since each RC6_UNIT
is quite short and some hardware takes some time to
adjust to the signal */
if (!eq_margin(ev.duration, RC6_PREFIX_PULSE, RC6_UNIT))
break;
data->state = STATE_PREFIX_SPACE;
data->count = 0;
return 0;
case STATE_PREFIX_SPACE:
if (u == RC6_PREFIX_SPACE) {
data->state = STATE_HEADER_BIT_START;
return 0;
}
break;
if (ev.pulse)
break;
if (!eq_margin(ev.duration, RC6_PREFIX_SPACE, RC6_UNIT / 2))
break;
data->state = STATE_HEADER_BIT_START;
return 0;
case STATE_HEADER_BIT_START:
if (DURATION(u) == 1) {
data->header <<= 1;
if (IS_PULSE(u))
data->header |= 1;
data->count++;
data->last_unit = u;
data->state = STATE_HEADER_BIT_END;
return 0;
}
break;
if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2))
break;
data->header <<= 1;
if (ev.pulse)
data->header |= 1;
data->count++;
data->prev_ev = ev;
data->state = STATE_HEADER_BIT_END;
return 0;
case STATE_HEADER_BIT_END:
if (IS_TRANSITION(u, data->last_unit)) {
if (data->count == RC6_HEADER_NBITS)
data->state = STATE_TOGGLE_START;
else
data->state = STATE_HEADER_BIT_START;
if (!is_transition(&ev, &data->prev_ev))
break;
DECREASE_DURATION(u, 1);
goto again;
}
break;
if (data->count == RC6_HEADER_NBITS)
data->state = STATE_TOGGLE_START;
else
data->state = STATE_HEADER_BIT_START;
decrease_duration(&ev, RC6_BIT_END);
goto again;
case STATE_TOGGLE_START:
if (DURATION(u) == 2) {
data->toggle = IS_PULSE(u);
data->last_unit = u;
data->state = STATE_TOGGLE_END;
return 0;
}
break;
if (!eq_margin(ev.duration, RC6_TOGGLE_START, RC6_UNIT / 2))
break;
data->toggle = ev.pulse;
data->prev_ev = ev;
data->state = STATE_TOGGLE_END;
return 0;
case STATE_TOGGLE_END:
if (IS_TRANSITION(u, data->last_unit) && DURATION(u) >= 2) {
data->state = STATE_BODY_BIT_START;
data->last_unit = u;
DECREASE_DURATION(u, 2);
data->count = 0;
if (!is_transition(&ev, &data->prev_ev) ||
!geq_margin(ev.duration, RC6_TOGGLE_END, RC6_UNIT / 2))
break;
if (!(data->header & RC6_STARTBIT_MASK)) {
IR_dprintk(1, "RC6 invalid start bit\n");
break;
}
switch (rc6_mode(data)) {
case RC6_MODE_0:
data->wanted_bits = RC6_0_NBITS;
break;
case RC6_MODE_6A:
/* This might look weird, but we basically
check the value of the first body bit to
determine the number of bits in mode 6A */
if ((DURATION(u) == 0 && IS_SPACE(data->last_unit)) || DURATION(u) > 0)
data->wanted_bits = RC6_6A_LARGE_NBITS;
else
data->wanted_bits = RC6_6A_SMALL_NBITS;
break;
default:
IR_dprintk(1, "RC6 unknown mode\n");
goto out;
}
goto again;
if (!(data->header & RC6_STARTBIT_MASK)) {
IR_dprintk(1, "RC6 invalid start bit\n");
break;
}
break;
data->state = STATE_BODY_BIT_START;
data->prev_ev = ev;
decrease_duration(&ev, RC6_TOGGLE_END);
data->count = 0;
switch (rc6_mode(data)) {
case RC6_MODE_0:
data->wanted_bits = RC6_0_NBITS;
break;
case RC6_MODE_6A:
/* This might look weird, but we basically
check the value of the first body bit to
determine the number of bits in mode 6A */
if ((!ev.pulse && !geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2)) ||
geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2))
data->wanted_bits = RC6_6A_LARGE_NBITS;
else
data->wanted_bits = RC6_6A_SMALL_NBITS;
break;
default:
IR_dprintk(1, "RC6 unknown mode\n");
goto out;
}
goto again;
case STATE_BODY_BIT_START:
if (DURATION(u) == 1) {
data->body <<= 1;
if (IS_PULSE(u))
data->body |= 1;
data->count++;
data->last_unit = u;
if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2))
break;
/*
* If the last bit is one, a space will merge
* with the silence after the command.
*/
if (IS_PULSE(u) && data->count == data->wanted_bits) {
data->state = STATE_FINISHED;
goto again;
}
data->body <<= 1;
if (ev.pulse)
data->body |= 1;
data->count++;
data->prev_ev = ev;
data->state = STATE_BODY_BIT_END;
return 0;
}
break;
data->state = STATE_BODY_BIT_END;
return 0;
case STATE_BODY_BIT_END:
if (IS_TRANSITION(u, data->last_unit)) {
if (data->count == data->wanted_bits)
data->state = STATE_FINISHED;
else
data->state = STATE_BODY_BIT_START;
if (!is_transition(&ev, &data->prev_ev))
break;
DECREASE_DURATION(u, 1);
goto again;
}
break;
if (data->count == data->wanted_bits)
data->state = STATE_FINISHED;
else
data->state = STATE_BODY_BIT_START;
decrease_duration(&ev, RC6_BIT_END);
goto again;
case STATE_FINISHED:
if (ev.pulse)
break;
switch (rc6_mode(data)) {
case RC6_MODE_0:
scancode = data->body & 0xffff;
@ -335,8 +342,8 @@ again:
}
out:
IR_dprintk(1, "RC6 decode failed at state %i (%i units, %ius)\n",
data->state, u, TO_US(duration));
IR_dprintk(1, "RC6 decode failed at state %i (%uus %s)\n",
data->state, TO_US(ev.duration), TO_STR(ev.pulse));
data->state = STATE_INACTIVE;
return -EINVAL;
}

18
include/media/ir-core.h
View File

@ -128,9 +128,21 @@ u32 ir_g_keycode_from_table(struct input_dev *input_dev, u32 scancode);
/* From ir-raw-event.c */
void ir_raw_event_handle(struct input_dev *input_dev);
int ir_raw_event_store(struct input_dev *input_dev, s64 duration);
int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type);
struct ir_raw_event {
unsigned pulse:1;
unsigned duration:31;
};
#define IR_MAX_DURATION 0x7FFFFFFF /* a bit more than 2 seconds */
void ir_raw_event_handle(struct input_dev *input_dev);
int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev);
int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type);
static inline void ir_raw_event_reset(struct input_dev *input_dev)
{
struct ir_raw_event ev = { .pulse = false, .duration = 0 };
ir_raw_event_store(input_dev, &ev);
ir_raw_event_handle(input_dev);
}
#endif /* _IR_CORE */