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linux/drivers/media/IR/ir-nec-decoder.c

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V4L/DVB: ir-core: dynamically load the compiled IR protocols Instead of hardcoding the protocols into ir-core, add a register interface for the IR protocol decoders, and convert ir-nec-decoder into a client of ir-core. With this approach, it is possible to dynamically load the needed IR protocols, and to add a RAW IR interface module, registered as one IR raw protocol decoder. This patch opens a way to register a lirc_dev interface to work as an userspace IR protocol decoder. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-24 23:47:53 +00:00
/* ir-nec-decoder.c - handle NEC IR Pulse/Space protocol
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
*
* Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <media/ir-core.h>
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
/* Start time: 4.5 ms + 560 us of the next pulse */
#define MIN_START_TIME (3900000 + 560000)
#define MAX_START_TIME (5100000 + 560000)
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
/* Bit 1 time: 2.25ms us */
#define MIN_BIT1_TIME 2050000
#define MAX_BIT1_TIME 2450000
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
/* Bit 0 time: 1.12ms us */
#define MIN_BIT0_TIME 920000
#define MAX_BIT0_TIME 1320000
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
/* Total IR code is 110 ms, including the 9 ms for the start pulse */
#define MAX_NEC_TIME 4000000
/* Total IR code is 110 ms, including the 9 ms for the start pulse */
#define MIN_REPEAT_TIME 99000000
#define MAX_REPEAT_TIME 112000000
/* Repeat time: 2.25ms us */
#define MIN_REPEAT_START_TIME 2050000
#define MAX_REPEAT_START_TIME 3000000
#define REPEAT_TIME 240 /* ms */
/** is_repeat - Check if it is a NEC repeat event
* @input_dev: the struct input_dev descriptor of the device
* @pos: the position of the first event
* @len: the length of the buffer
*/
static int is_repeat(struct ir_raw_event *evs, int len, int pos)
{
if ((evs[pos].delta.tv_nsec < MIN_REPEAT_START_TIME) ||
(evs[pos].delta.tv_nsec > MAX_REPEAT_START_TIME))
return 0;
if (++pos >= len)
return 0;
if ((evs[pos].delta.tv_nsec < MIN_REPEAT_TIME) ||
(evs[pos].delta.tv_nsec > MAX_REPEAT_TIME))
return 0;
return 1;
}
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
/**
* __ir_nec_decode() - Decode one NEC pulsecode
* @input_dev: the struct input_dev descriptor of the device
* @evs: event array with type/duration of pulse/space
* @len: length of the array
* @pos: position to start seeking for a code
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
* This function returns -EINVAL if no pulse got decoded,
* 0 if buffer is empty and 1 if one keycode were handled.
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
*/
static int __ir_nec_decode(struct input_dev *input_dev,
struct ir_raw_event *evs,
int len, int *pos)
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
{
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
struct ir_input_dev *ir = input_get_drvdata(input_dev);
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
int count = -1;
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
int ircode = 0, not_code = 0;
/* Be sure that the first event is an start one and is a pulse */
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
for (; *pos < len; (*pos)++) {
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
/* Very long delays are considered as start events */
if (evs[*pos].delta.tv_nsec > MAX_NEC_TIME)
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
break;
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
if (evs[*pos].type & IR_START_EVENT)
break;
IR_dprintk(1, "%luus: Spurious NEC %s\n",
(evs[*pos].delta.tv_nsec + 500) / 1000,
(evs[*pos].type & IR_SPACE) ? "space" : "pulse");
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
}
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
if (*pos >= len)
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
return 0;
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
(*pos)++; /* First event doesn't contain data */
if (evs[*pos].type != IR_PULSE)
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
goto err;
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
/* Check if it is a NEC repeat event */
if (is_repeat(evs, len, *pos)) {
*pos += 2;
if (ir->keypressed) {
mod_timer(&ir->raw->timer_keyup,
jiffies + msecs_to_jiffies(REPEAT_TIME));
IR_dprintk(1, "NEC repeat event\n");
return 1;
} else {
IR_dprintk(1, "missing NEC repeat event\n");
return 0;
}
}
/* First space should have 4.5 ms otherwise is not NEC protocol */
if ((evs[*pos].delta.tv_nsec < MIN_START_TIME) ||
(evs[*pos].delta.tv_nsec > MAX_START_TIME))
goto err;
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
count = 0;
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
for ((*pos)++; *pos < len; (*pos)++) {
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
int bit;
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
if ((evs[*pos].delta.tv_nsec > MIN_BIT1_TIME) &&
(evs[*pos].delta.tv_nsec < MAX_BIT1_TIME))
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
bit = 1;
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
else if ((evs[*pos].delta.tv_nsec > MIN_BIT0_TIME) &&
(evs[*pos].delta.tv_nsec < MAX_BIT0_TIME))
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
bit = 0;
else
goto err;
if (bit) {
int shift = count;
/* Address first, then command */
if (shift < 8) {
shift += 8;
ircode |= 1 << shift;
} else if (shift < 16) {
not_code |= 1 << shift;
} else if (shift < 24) {
shift -= 16;
ircode |= 1 << shift;
} else {
shift -= 24;
not_code |= 1 << shift;
}
}
if (++count == 32)
break;
}
V4L/DVB: ir-core: dynamically load the compiled IR protocols Instead of hardcoding the protocols into ir-core, add a register interface for the IR protocol decoders, and convert ir-nec-decoder into a client of ir-core. With this approach, it is possible to dynamically load the needed IR protocols, and to add a RAW IR interface module, registered as one IR raw protocol decoder. This patch opens a way to register a lirc_dev interface to work as an userspace IR protocol decoder. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-24 23:47:53 +00:00
(*pos)++;
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
/*
* Fixme: may need to accept Extended NEC protocol?
*/
if ((ircode & ~not_code) != ircode) {
IR_dprintk(1, "NEC checksum error: code 0x%04x, not-code 0x%04x\n",
ircode, not_code);
return -EINVAL;
}
IR_dprintk(1, "NEC scancode 0x%04x\n", ircode);
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
ir_keydown(input_dev, ircode);
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
mod_timer(&ir->raw->timer_keyup,
jiffies + msecs_to_jiffies(REPEAT_TIME));
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
return 1;
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
err:
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
IR_dprintk(1, "NEC decoded failed at bit %d (%s) while decoding %luus time\n",
count,
(evs[*pos].type & IR_SPACE) ? "space" : "pulse",
(evs[*pos].delta.tv_nsec + 500) / 1000);
V4L/DVB: ir-core: Add logic to decode IR protocols at the IR core Adds a method to pass IR raw pulse/code events into ir-core. This is needed in order to support LIRC. It also helps to move common code from the drivers into the core. In order to allow testing, it implements a simple NEC protocol decoder at ir-nec-decoder.c file. The logic is about the same used at saa7134 driver that handles Avermedia M135A and Encore FM53 boards. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-20 23:59:44 +00:00
return -EINVAL;
}
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
/**
* __ir_nec_decode() - Decodes all NEC pulsecodes on a given array
* @input_dev: the struct input_dev descriptor of the device
* @evs: event array with type/duration of pulse/space
* @len: length of the array
* This function returns the number of decoded pulses or -EINVAL if no
* pulse got decoded
*/
V4L/DVB: ir-core: dynamically load the compiled IR protocols Instead of hardcoding the protocols into ir-core, add a register interface for the IR protocol decoders, and convert ir-nec-decoder into a client of ir-core. With this approach, it is possible to dynamically load the needed IR protocols, and to add a RAW IR interface module, registered as one IR raw protocol decoder. This patch opens a way to register a lirc_dev interface to work as an userspace IR protocol decoder. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-24 23:47:53 +00:00
static int ir_nec_decode(struct input_dev *input_dev,
struct ir_raw_event *evs,
int len)
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
{
int pos = 0;
int rc = 0;
while (pos < len) {
V4L/DVB: saa7134: don't wait too much to generate an IR event on raw_decode At raw_decode mode, the key is processed after the end of a timer. The previous code resets the timer every time something is received at the IR port. While this works fine with IR's that don't implement repeat, like Avermedia RM-JX IR, it keeps waiting until keydown, on IR's that implement NEC repeat command, like the Terratec yellow. The solution is to change the behaviour to do the timeout after the first received data. The timeout is currently set to 15 ms, as it works fine with NEC protcocol. It may need some adjustments to support other protocols and to better handle spurious detections that may happen with some IR sensors. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 16:00:55 +00:00
if (__ir_nec_decode(input_dev, evs, len, &pos) > 0)
V4L/DVB: ir-core/saa7134: Move ir keyup/keydown code to the ir-core Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-21 15:24:24 +00:00
rc++;
}
if (!rc)
return -EINVAL;
return rc;
}
V4L/DVB: ir-core: dynamically load the compiled IR protocols Instead of hardcoding the protocols into ir-core, add a register interface for the IR protocol decoders, and convert ir-nec-decoder into a client of ir-core. With this approach, it is possible to dynamically load the needed IR protocols, and to add a RAW IR interface module, registered as one IR raw protocol decoder. This patch opens a way to register a lirc_dev interface to work as an userspace IR protocol decoder. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-03-24 23:47:53 +00:00
static struct ir_raw_handler nec_handler = {
.decode = ir_nec_decode,
};
static int __init ir_nec_decode_init(void)
{
ir_raw_handler_register(&nec_handler);
printk(KERN_INFO "IR NEC protocol handler initialized\n");
return 0;
}
static void __exit ir_nec_decode_exit(void)
{
ir_raw_handler_unregister(&nec_handler);
}
module_init(ir_nec_decode_init);
module_exit(ir_nec_decode_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
MODULE_DESCRIPTION("NEC IR protocol decoder");
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