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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>
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e3cd973429
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@ -424,7 +424,7 @@ static int ir_mce_kbd_unregister(struct rc_dev *dev)
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}
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static const struct ir_raw_timings_manchester ir_mce_kbd_timings = {
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.leader = MCIR2_PREFIX_PULSE,
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.leader_pulse = MCIR2_PREFIX_PULSE,
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.invert = 1,
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.clock = MCIR2_UNIT,
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.trailer_space = MCIR2_UNIT * 10,
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@ -173,16 +173,14 @@ out:
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}
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static const struct ir_raw_timings_manchester ir_rc5_timings = {
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.leader = RC5_UNIT,
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.pulse_space_start = 0,
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.leader_pulse = RC5_UNIT,
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.clock = RC5_UNIT,
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.trailer_space = RC5_UNIT * 10,
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};
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static const struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
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{
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.leader = RC5_UNIT,
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.pulse_space_start = 0,
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.leader_pulse = RC5_UNIT,
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.clock = RC5_UNIT,
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.trailer_space = RC5X_SPACE,
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},
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@ -193,8 +191,7 @@ static const struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
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};
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static const struct ir_raw_timings_manchester ir_rc5_sz_timings = {
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.leader = RC5_UNIT,
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.pulse_space_start = 0,
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.leader_pulse = RC5_UNIT,
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.clock = RC5_UNIT,
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.trailer_space = RC5_UNIT * 10,
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};
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@ -288,13 +288,8 @@ out:
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static const struct ir_raw_timings_manchester ir_rc6_timings[4] = {
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{
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.leader = RC6_PREFIX_PULSE,
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.pulse_space_start = 0,
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.clock = RC6_UNIT,
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.invert = 1,
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.trailer_space = RC6_PREFIX_SPACE,
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},
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{
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.leader_pulse = RC6_PREFIX_PULSE,
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.leader_space = RC6_PREFIX_SPACE,
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.clock = RC6_UNIT,
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.invert = 1,
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},
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@ -329,27 +324,22 @@ static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
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struct ir_raw_event *e = events;
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if (protocol == RC_PROTO_RC6_0) {
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/* Modulate the preamble */
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ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);
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if (ret < 0)
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return ret;
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/* Modulate the header (Start Bit & Mode-0) */
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ret = ir_raw_gen_manchester(&e, max - (e - events),
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&ir_rc6_timings[1],
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RC6_HEADER_NBITS, (1 << 3));
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&ir_rc6_timings[0],
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RC6_HEADER_NBITS + 1, (1 << 3));
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if (ret < 0)
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return ret;
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/* Modulate Trailer Bit */
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ret = ir_raw_gen_manchester(&e, max - (e - events),
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&ir_rc6_timings[2], 1, 0);
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&ir_rc6_timings[1], 1, 0);
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if (ret < 0)
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return ret;
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/* Modulate rest of the data */
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ret = ir_raw_gen_manchester(&e, max - (e - events),
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&ir_rc6_timings[3], RC6_0_NBITS,
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&ir_rc6_timings[2], RC6_0_NBITS,
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scancode);
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if (ret < 0)
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return ret;
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@ -372,27 +362,22 @@ static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
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return -EINVAL;
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}
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/* Modulate the preamble */
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ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);
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if (ret < 0)
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return ret;
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/* Modulate the header (Start Bit & Header-version 6 */
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ret = ir_raw_gen_manchester(&e, max - (e - events),
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&ir_rc6_timings[1],
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RC6_HEADER_NBITS, (1 << 3 | 6));
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&ir_rc6_timings[0],
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RC6_HEADER_NBITS + 1, (1 << 3 | 6));
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if (ret < 0)
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return ret;
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/* Modulate Trailer Bit */
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ret = ir_raw_gen_manchester(&e, max - (e - events),
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&ir_rc6_timings[2], 1, 0);
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&ir_rc6_timings[1], 1, 0);
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if (ret < 0)
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return ret;
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/* Modulate rest of the data */
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ret = ir_raw_gen_manchester(&e, max - (e - events),
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&ir_rc6_timings[3],
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&ir_rc6_timings[2],
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bits,
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scancode);
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if (ret < 0)
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@ -166,17 +166,17 @@ static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
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/**
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* struct ir_raw_timings_manchester - Manchester coding timings
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* @leader: duration of leader pulse (if any) 0 if continuing
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* existing signal (see @pulse_space_start)
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* @pulse_space_start: 1 for starting with pulse (0 for starting with space)
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* @leader_pulse: duration of leader pulse (if any) 0 if continuing
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* existing signal
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* @leader_space: duration of leader space (if any)
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* @clock: duration of each pulse/space in ns
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* @invert: if set clock logic is inverted
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* (0 = space + pulse, 1 = pulse + space)
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* @trailer_space: duration of trailer space in ns
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*/
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struct ir_raw_timings_manchester {
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unsigned int leader;
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unsigned int pulse_space_start:1;
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unsigned int leader_pulse;
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unsigned int leader_space;
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unsigned int clock;
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unsigned int invert:1;
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unsigned int trailer_space;
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@ -246,17 +246,15 @@ int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
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i = BIT_ULL(n - 1);
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if (timings->leader) {
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if (timings->leader_pulse) {
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if (!max--)
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return ret;
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if (timings->pulse_space_start) {
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init_ir_raw_event_duration((*ev)++, 1, timings->leader);
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init_ir_raw_event_duration((*ev), 1, timings->leader_pulse);
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if (timings->leader_space) {
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if (!max--)
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return ret;
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init_ir_raw_event_duration((*ev), 0, timings->leader);
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} else {
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init_ir_raw_event_duration((*ev), 1, timings->leader);
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init_ir_raw_event_duration(++(*ev), 0,
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timings->leader_space);
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}
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i >>= 1;
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} else {
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