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media: rc: ir-nec-decoder: move scancode composing code into a shared function 

The NEC scancode composing and protocol type detection in
ir_nec_decode() is generic enough to be a shared function.  Let's create
an inline function in rc-core.h, so that other remote control drivers
can reuse this function to save some code.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Shawn Guo 2017-07-30 09:23:11 -04:00 committed by Mauro Carvalho Chehab
parent a2df9d0643
commit e8ffda7862
2 changed files with 34 additions and 29 deletions
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32
drivers/media/rc/ir-nec-decoder.c
View File

@ -51,7 +51,6 @@ static int ir_nec_decode(struct rc_dev *dev, struct ir_raw_event ev)
u32 scancode;
enum rc_type rc_type;
u8 address, not_address, command, not_command;
bool send_32bits = false;
if (!is_timing_event(ev)) {
if (ev.reset)
@ -157,34 +156,9 @@ static int ir_nec_decode(struct rc_dev *dev, struct ir_raw_event ev)
command = bitrev8((data->bits >> 8) & 0xff);
not_command = bitrev8((data->bits >> 0) & 0xff);
if ((command ^ not_command) != 0xff) {
IR_dprintk(1, "NEC checksum error: received 0x%08x\n",
data->bits);
send_32bits = true;
}
if (send_32bits) {
/* NEC transport, but modified protocol, used by at
* least Apple and TiVo remotes */
scancode = not_address << 24 |
address << 16 |
not_command << 8 |
command;
IR_dprintk(1, "NEC (modified) scancode 0x%08x\n", scancode);
rc_type = RC_TYPE_NEC32;
} else if ((address ^ not_address) != 0xff) {
/* Extended NEC */
scancode = address << 16 |
not_address << 8 |
command;
IR_dprintk(1, "NEC (Ext) scancode 0x%06x\n", scancode);
rc_type = RC_TYPE_NECX;
} else {
/* Normal NEC */
scancode = address << 8 | command;
IR_dprintk(1, "NEC scancode 0x%04x\n", scancode);
rc_type = RC_TYPE_NEC;
}
scancode = ir_nec_bytes_to_scancode(address, not_address,
command, not_command,
&rc_type);
if (data->is_nec_x)
data->necx_repeat = true;

31
include/media/rc-core.h
View File

@ -340,4 +340,35 @@ static inline u32 ir_extract_bits(u32 data, u32 mask)
return value;
}
/* Get NEC scancode and protocol type from address and command bytes */
static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address,
u8 command, u8 not_command,
enum rc_type *protocol)
{
u32 scancode;
if ((command ^ not_command) != 0xff) {
/* NEC transport, but modified protocol, used by at
* least Apple and TiVo remotes
*/
scancode = not_address << 24 |
address << 16 |
not_command << 8 |
command;
*protocol = RC_TYPE_NEC32;
} else if ((address ^ not_address) != 0xff) {
/* Extended NEC */
scancode = address << 16 |
not_address << 8 |
command;
*protocol = RC_TYPE_NECX;
} else {
/* Normal NEC */
scancode = address << 8 | command;
*protocol = RC_TYPE_NEC;
}
return scancode;
}
#endif /* _RC_CORE */