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Revert "[media] rc: ir-rc5-decoder: Add encode capability" 

This reverts commit a0466f15b4.

The current code is not mature enough, the API should allow a single
protocol to be specified. Also, the current code contains heuristics
that will depend on module load order.

Signed-off-by: David Härdeman <david@hardeman.nu>
Acked-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
David Härdeman 2015-07-20 16:16:51 -03:00 коммит произвёл Mauro Carvalho Chehab
Родитель 70e7112e7d
Коммит e49b361d4f
1 изменённых файлов: 0 добавлений и 116 удалений
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116
drivers/media/rc/ir-rc5-decoder.c
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@ -184,125 +184,9 @@ out:
return -EINVAL;
}
static struct ir_raw_timings_manchester ir_rc5_timings = {
.leader = RC5_UNIT,
.pulse_space_start = 0,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};
static struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
{
.leader = RC5_UNIT,
.pulse_space_start = 0,
.clock = RC5_UNIT,
.trailer_space = RC5X_SPACE,
},
{
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
},
};
static struct ir_raw_timings_manchester ir_rc5_sz_timings = {
.leader = RC5_UNIT,
.pulse_space_start = 0,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};
static int ir_rc5_validate_filter(const struct rc_scancode_filter *scancode,
unsigned int important_bits)
{
/* all important bits of scancode should be set in mask */
if (~scancode->mask & important_bits)
return -EINVAL;
/* extra bits in mask should be zero in data */
if (scancode->mask & scancode->data & ~important_bits)
return -EINVAL;
return 0;
}
/**
* ir_rc5_encode() - Encode a scancode as a stream of raw events
*
* @protocols: allowed protocols
* @scancode: scancode filter describing scancode (helps distinguish between
* protocol subtypes when scancode is ambiguous)
* @events: array of raw ir events to write into
* @max: maximum size of @events
*
* Returns: The number of events written.
* -ENOBUFS if there isn't enough space in the array to fit the
* encoding. In this case all @max events will have been written.
* -EINVAL if the scancode is ambiguous or invalid.
*/
static int ir_rc5_encode(u64 protocols,
const struct rc_scancode_filter *scancode,
struct ir_raw_event *events, unsigned int max)
{
int ret;
struct ir_raw_event *e = events;
unsigned int data, xdata, command, commandx, system;
/* Detect protocol and convert scancode to raw data */
if (protocols & RC_BIT_RC5 &&
!ir_rc5_validate_filter(scancode, 0x1f7f)) {
/* decode scancode */
command = (scancode->data & 0x003f) >> 0;
commandx = (scancode->data & 0x0040) >> 6;
system = (scancode->data & 0x1f00) >> 8;
/* encode data */
data = !commandx << 12 | system << 6 | command;
/* Modulate the data */
ret = ir_raw_gen_manchester(&e, max, &ir_rc5_timings, RC5_NBITS,
data);
if (ret < 0)
return ret;
} else if (protocols & RC_BIT_RC5X &&
!ir_rc5_validate_filter(scancode, 0x1f7f3f)) {
/* decode scancode */
xdata = (scancode->data & 0x00003f) >> 0;
command = (scancode->data & 0x003f00) >> 8;
commandx = (scancode->data & 0x004000) >> 14;
system = (scancode->data & 0x1f0000) >> 16;
/* commandx and system overlap, bits must match when encoded */
if (commandx == (system & 0x1))
return -EINVAL;
/* encode data */
data = 1 << 18 | system << 12 | command << 6 | xdata;
/* Modulate the data */
ret = ir_raw_gen_manchester(&e, max, &ir_rc5x_timings[0],
CHECK_RC5X_NBITS,
data >> (RC5X_NBITS-CHECK_RC5X_NBITS));
if (ret < 0)
return ret;
ret = ir_raw_gen_manchester(&e, max - (e - events),
&ir_rc5x_timings[1],
RC5X_NBITS - CHECK_RC5X_NBITS,
data);
if (ret < 0)
return ret;
} else if (protocols & RC_BIT_RC5_SZ &&
!ir_rc5_validate_filter(scancode, 0x2fff)) {
/* RC5-SZ scancode is raw enough for Manchester as it is */
ret = ir_raw_gen_manchester(&e, max, &ir_rc5_sz_timings,
RC5_SZ_NBITS, scancode->data & 0x2fff);
if (ret < 0)
return ret;
} else {
return -EINVAL;
}
return e - events;
}
static struct ir_raw_handler rc5_handler = {
.protocols = RC_BIT_RC5 | RC_BIT_RC5X | RC_BIT_RC5_SZ,
.decode = ir_rc5_decode,
.encode = ir_rc5_encode,
};
static int __init ir_rc5_decode_init(void)