media: rc: clean up leader pulse/space for manchester encoding

The IR rc6 encoder sends the header using manchester encoding using 0
bits, which causes the following:

UBSAN: Undefined behaviour in drivers/media/rc/rc-ir-raw.c:247:6
shift exponent 4294967295 is too large for 64-bit type 'long long unsigned int'

So, allow the leader code to send a pulse and space and remove the unused
pulse_space_start field.

Cc: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sean Young 2018-01-05 08:26:51 -05:00 committed by Mauro Carvalho Chehab
parent e3cd973429
commit ddf9c1bb3d
5 changed files with 24 additions and 44 deletions

View File

@ -424,7 +424,7 @@ static int ir_mce_kbd_unregister(struct rc_dev *dev)
}
static const struct ir_raw_timings_manchester ir_mce_kbd_timings = {
.leader = MCIR2_PREFIX_PULSE,
.leader_pulse = MCIR2_PREFIX_PULSE,
.invert = 1,
.clock = MCIR2_UNIT,
.trailer_space = MCIR2_UNIT * 10,

View File

@ -173,16 +173,14 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
}
static const struct ir_raw_timings_manchester ir_rc5_timings = {
.leader = RC5_UNIT,
.pulse_space_start = 0,
.leader_pulse = RC5_UNIT,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};
static const struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
{
.leader = RC5_UNIT,
.pulse_space_start = 0,
.leader_pulse = RC5_UNIT,
.clock = RC5_UNIT,
.trailer_space = RC5X_SPACE,
},
@ -193,8 +191,7 @@ static const struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
};
static const struct ir_raw_timings_manchester ir_rc5_sz_timings = {
.leader = RC5_UNIT,
.pulse_space_start = 0,
.leader_pulse = RC5_UNIT,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};

View File

@ -288,13 +288,8 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
static const struct ir_raw_timings_manchester ir_rc6_timings[4] = {
{
.leader = RC6_PREFIX_PULSE,
.pulse_space_start = 0,
.clock = RC6_UNIT,
.invert = 1,
.trailer_space = RC6_PREFIX_SPACE,
},
{
.leader_pulse = RC6_PREFIX_PULSE,
.leader_space = RC6_PREFIX_SPACE,
.clock = RC6_UNIT,
.invert = 1,
},
@ -329,27 +324,22 @@ static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
struct ir_raw_event *e = events;
if (protocol == RC_PROTO_RC6_0) {
/* Modulate the preamble */
ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);
if (ret < 0)
return ret;
/* Modulate the header (Start Bit & Mode-0) */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[1],
RC6_HEADER_NBITS, (1 << 3));
&ir_rc6_timings[0],
RC6_HEADER_NBITS + 1, (1 << 3));
if (ret < 0)
return ret;
/* Modulate Trailer Bit */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[2], 1, 0);
&ir_rc6_timings[1], 1, 0);
if (ret < 0)
return ret;
/* Modulate rest of the data */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[3], RC6_0_NBITS,
&ir_rc6_timings[2], RC6_0_NBITS,
scancode);
if (ret < 0)
return ret;
@ -372,27 +362,22 @@ static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
return -EINVAL;
}
/* Modulate the preamble */
ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);
if (ret < 0)
return ret;
/* Modulate the header (Start Bit & Header-version 6 */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[1],
RC6_HEADER_NBITS, (1 << 3 | 6));
&ir_rc6_timings[0],
RC6_HEADER_NBITS + 1, (1 << 3 | 6));
if (ret < 0)
return ret;
/* Modulate Trailer Bit */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[2], 1, 0);
&ir_rc6_timings[1], 1, 0);
if (ret < 0)
return ret;
/* Modulate rest of the data */
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc6_timings[3],
&ir_rc6_timings[2],
bits,
scancode);
if (ret < 0)

View File

@ -166,17 +166,17 @@ static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
/**
* struct ir_raw_timings_manchester - Manchester coding timings
* @leader: duration of leader pulse (if any) 0 if continuing
* existing signal (see @pulse_space_start)
* @pulse_space_start: 1 for starting with pulse (0 for starting with space)
* @leader_pulse: duration of leader pulse (if any) 0 if continuing
* existing signal
* @leader_space: duration of leader space (if any)
* @clock: duration of each pulse/space in ns
* @invert: if set clock logic is inverted
* (0 = space + pulse, 1 = pulse + space)
* @trailer_space: duration of trailer space in ns
*/
struct ir_raw_timings_manchester {
unsigned int leader;
unsigned int pulse_space_start:1;
unsigned int leader_pulse;
unsigned int leader_space;
unsigned int clock;
unsigned int invert:1;
unsigned int trailer_space;

View File

@ -246,17 +246,15 @@ int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
i = BIT_ULL(n - 1);
if (timings->leader) {
if (timings->leader_pulse) {
if (!max--)
return ret;
if (timings->pulse_space_start) {
init_ir_raw_event_duration((*ev)++, 1, timings->leader);
init_ir_raw_event_duration((*ev), 1, timings->leader_pulse);
if (timings->leader_space) {
if (!max--)
return ret;
init_ir_raw_event_duration((*ev), 0, timings->leader);
} else {
init_ir_raw_event_duration((*ev), 1, timings->leader);
init_ir_raw_event_duration(++(*ev), 0,
timings->leader_space);
}
i >>= 1;
} else {