2010-03-25 07:47:53 +08:00
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/* ir-nec-decoder.c - handle NEC IR Pulse/Space protocol
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2010-03-21 07:59:44 +08:00
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*
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* Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <media/ir-core.h>
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2010-04-09 00:10:00 +08:00
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#include <linux/bitrev.h>
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2010-03-21 07:59:44 +08:00
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2010-04-04 07:33:00 +08:00
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#define NEC_NBITS 32
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2010-04-09 00:10:00 +08:00
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#define NEC_UNIT 562500 /* ns */
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#define NEC_HEADER_PULSE PULSE(16)
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#define NEC_HEADER_SPACE SPACE(8)
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#define NEC_REPEAT_SPACE SPACE(4)
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#define NEC_BIT_PULSE PULSE(1)
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#define NEC_BIT_0_SPACE SPACE(1)
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#define NEC_BIT_1_SPACE SPACE(3)
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2010-03-22 00:00:55 +08:00
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2010-03-26 10:49:46 +08:00
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/* Used to register nec_decoder clients */
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static LIST_HEAD(decoder_list);
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2010-04-08 03:19:36 +08:00
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static DEFINE_SPINLOCK(decoder_lock);
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2010-03-26 10:49:46 +08:00
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V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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enum nec_state {
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STATE_INACTIVE,
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STATE_HEADER_SPACE,
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2010-04-09 00:10:00 +08:00
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STATE_BIT_PULSE,
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STATE_BIT_SPACE,
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STATE_TRAILER_PULSE,
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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STATE_TRAILER_SPACE,
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};
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2010-03-26 10:49:46 +08:00
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struct decoder_data {
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struct list_head list;
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struct ir_input_dev *ir_dev;
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int enabled:1;
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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/* State machine control */
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enum nec_state state;
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2010-04-09 00:10:00 +08:00
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u32 nec_bits;
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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unsigned count;
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2010-03-26 10:49:46 +08:00
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};
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/**
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* get_decoder_data() - gets decoder data
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* @input_dev: input device
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*
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* Returns the struct decoder_data that corresponds to a device
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*/
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static struct decoder_data *get_decoder_data(struct ir_input_dev *ir_dev)
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{
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struct decoder_data *data = NULL;
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spin_lock(&decoder_lock);
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list_for_each_entry(data, &decoder_list, list) {
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if (data->ir_dev == ir_dev)
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break;
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}
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spin_unlock(&decoder_lock);
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return data;
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}
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static ssize_t store_enabled(struct device *d,
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struct device_attribute *mattr,
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const char *buf,
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size_t len)
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{
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unsigned long value;
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struct ir_input_dev *ir_dev = dev_get_drvdata(d);
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struct decoder_data *data = get_decoder_data(ir_dev);
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if (!data)
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return -EINVAL;
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if (strict_strtoul(buf, 10, &value) || value > 1)
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return -EINVAL;
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data->enabled = value;
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return len;
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}
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static ssize_t show_enabled(struct device *d,
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struct device_attribute *mattr, char *buf)
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{
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struct ir_input_dev *ir_dev = dev_get_drvdata(d);
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struct decoder_data *data = get_decoder_data(ir_dev);
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if (!data)
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return -EINVAL;
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if (data->enabled)
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return sprintf(buf, "1\n");
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else
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return sprintf(buf, "0\n");
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}
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static DEVICE_ATTR(enabled, S_IRUGO | S_IWUSR, show_enabled, store_enabled);
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static struct attribute *decoder_attributes[] = {
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&dev_attr_enabled.attr,
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NULL
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};
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static struct attribute_group decoder_attribute_group = {
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.name = "nec_decoder",
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.attrs = decoder_attributes,
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};
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|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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/**
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2010-04-04 21:44:51 +08:00
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* ir_nec_decode() - Decode one NEC pulse or space
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2010-03-22 00:00:55 +08:00
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* @input_dev: the struct input_dev descriptor of the device
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2010-04-09 00:10:00 +08:00
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* @duration: duration in ns of pulse/space
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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*
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* This function returns -EINVAL if the pulse violates the state machine
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2010-03-22 00:00:55 +08:00
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*/
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2010-04-09 00:10:00 +08:00
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static int ir_nec_decode(struct input_dev *input_dev, s64 duration)
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2010-03-22 00:00:55 +08:00
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{
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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struct decoder_data *data;
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struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
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2010-04-09 00:10:00 +08:00
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int u;
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u32 scancode;
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u8 address, not_address, command, not_command;
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2010-03-22 00:00:55 +08:00
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|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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data = get_decoder_data(ir_dev);
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if (!data)
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return -EINVAL;
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2010-03-22 00:00:55 +08:00
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2010-04-05 01:45:04 +08:00
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if (!data->enabled)
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return 0;
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2010-04-09 00:10:00 +08:00
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if (IS_RESET(duration)) {
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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data->state = STATE_INACTIVE;
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2010-04-09 00:10:00 +08:00
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return 0;
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}
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2010-03-21 07:59:44 +08:00
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2010-04-09 00:10:00 +08:00
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u = TO_UNITS(duration, NEC_UNIT);
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if (DURATION(u) == 0)
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goto out;
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IR_dprintk(2, "NEC decode started at state %d (%i units, %ius)\n",
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data->state, u, TO_US(duration));
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2010-03-22 00:00:55 +08:00
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|
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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switch (data->state) {
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2010-03-21 07:59:44 +08:00
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2010-04-09 00:10:00 +08:00
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case STATE_INACTIVE:
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if (u == NEC_HEADER_PULSE) {
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data->count = 0;
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data->state = STATE_HEADER_SPACE;
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}
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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return 0;
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2010-04-09 00:10:00 +08:00
|
|
|
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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case STATE_HEADER_SPACE:
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2010-04-09 00:10:00 +08:00
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if (u == NEC_HEADER_SPACE) {
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data->state = STATE_BIT_PULSE;
|
2010-03-22 00:00:55 +08:00
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return 0;
|
2010-04-09 00:10:00 +08:00
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} else if (u == NEC_REPEAT_SPACE) {
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
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ir_repeat(input_dev);
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IR_dprintk(1, "Repeat last key\n");
|
2010-04-09 00:10:00 +08:00
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|
data->state = STATE_TRAILER_PULSE;
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
|
|
|
return 0;
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|
}
|
2010-04-09 00:10:00 +08:00
|
|
|
break;
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case STATE_BIT_PULSE:
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|
if (u == NEC_BIT_PULSE) {
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data->state = STATE_BIT_SPACE;
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|
|
return 0;
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|
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|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case STATE_BIT_SPACE:
|
|
|
|
if (u != NEC_BIT_0_SPACE && u != NEC_BIT_1_SPACE)
|
|
|
|
break;
|
|
|
|
|
|
|
|
data->nec_bits <<= 1;
|
|
|
|
if (u == NEC_BIT_1_SPACE)
|
|
|
|
data->nec_bits |= 1;
|
|
|
|
data->count++;
|
|
|
|
|
|
|
|
if (data->count != NEC_NBITS) {
|
|
|
|
data->state = STATE_BIT_PULSE;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
address = bitrev8((data->nec_bits >> 24) & 0xff);
|
|
|
|
not_address = bitrev8((data->nec_bits >> 16) & 0xff);
|
|
|
|
command = bitrev8((data->nec_bits >> 8) & 0xff);
|
|
|
|
not_command = bitrev8((data->nec_bits >> 0) & 0xff);
|
|
|
|
|
|
|
|
if ((command ^ not_command) != 0xff) {
|
|
|
|
IR_dprintk(1, "NEC checksum error: received 0x%08x\n",
|
|
|
|
data->nec_bits);
|
|
|
|
break;
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
|
|
|
}
|
2010-03-21 07:59:44 +08:00
|
|
|
|
2010-04-09 00:10:00 +08:00
|
|
|
if ((address ^ not_address) != 0xff) {
|
|
|
|
/* Extended NEC */
|
|
|
|
scancode = address << 16 |
|
|
|
|
not_address << 8 |
|
|
|
|
command;
|
|
|
|
IR_dprintk(1, "NEC (Ext) scancode 0x%06x\n", scancode);
|
|
|
|
} else {
|
|
|
|
/* normal NEC */
|
|
|
|
scancode = address << 8 | command;
|
|
|
|
IR_dprintk(1, "NEC scancode 0x%04x\n", scancode);
|
2010-03-21 07:59:44 +08:00
|
|
|
}
|
2010-04-09 00:10:00 +08:00
|
|
|
|
|
|
|
ir_keydown(input_dev, scancode, 0);
|
|
|
|
data->state = STATE_TRAILER_PULSE;
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
|
|
|
return 0;
|
2010-04-09 00:10:00 +08:00
|
|
|
|
|
|
|
case STATE_TRAILER_PULSE:
|
|
|
|
if (u > 0) {
|
|
|
|
data->state = STATE_TRAILER_SPACE;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
|
|
|
case STATE_TRAILER_SPACE:
|
2010-04-09 00:10:00 +08:00
|
|
|
if (u < 0) {
|
|
|
|
data->state = STATE_INACTIVE;
|
|
|
|
return 0;
|
|
|
|
}
|
2010-03-21 07:59:44 +08:00
|
|
|
|
2010-04-09 00:10:00 +08:00
|
|
|
break;
|
|
|
|
}
|
2010-03-21 07:59:44 +08:00
|
|
|
|
2010-04-09 00:10:00 +08:00
|
|
|
out:
|
|
|
|
IR_dprintk(1, "NEC decode failed at state %d (%i units, %ius)\n",
|
|
|
|
data->state, u, TO_US(duration));
|
V4L/DVB: ir-nec-decoder: Reimplement the entire decoder
Thanks to Andy Walls <awalls@md.metrocast.net> for pointing me his
code, that gave me some ideas to better implement it.
After some work with saa7134 bits, I found a way to catch both IRQ
edge pulses. By enabling it, the NEC decoder can now take both
pulse and spaces into account, making it more precise.
Instead of the old strategy of handling the events all at once,
this code implements a state machine. Due to that, it handles
individual pulse or space events, validating them against the
protocol, producing a much more reliable decoding.
With the new implementation, the protocol trailer bits are properly
handled, making possible for the repeat key to work.
Also, the code is now capable of handling both NEC and NEC extended
IR devices. With NEC, it produces a 16 bits code, while with NEC
extended, a 24 bits code is returned.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-04-04 05:51:50 +08:00
|
|
|
data->state = STATE_INACTIVE;
|
2010-03-21 07:59:44 +08:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
2010-03-21 23:24:24 +08:00
|
|
|
|
2010-03-26 10:49:46 +08:00
|
|
|
static int ir_nec_register(struct input_dev *input_dev)
|
|
|
|
{
|
|
|
|
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
|
|
|
|
struct decoder_data *data;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
|
|
|
|
if (rc < 0)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
|
|
if (!data) {
|
|
|
|
sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
data->ir_dev = ir_dev;
|
|
|
|
data->enabled = 1;
|
|
|
|
|
|
|
|
spin_lock(&decoder_lock);
|
|
|
|
list_add_tail(&data->list, &decoder_list);
|
|
|
|
spin_unlock(&decoder_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ir_nec_unregister(struct input_dev *input_dev)
|
|
|
|
{
|
|
|
|
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
|
|
|
|
static struct decoder_data *data;
|
|
|
|
|
|
|
|
data = get_decoder_data(ir_dev);
|
|
|
|
if (!data)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
|
|
|
|
|
|
|
|
spin_lock(&decoder_lock);
|
|
|
|
list_del(&data->list);
|
|
|
|
spin_unlock(&decoder_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-03-25 07:47:53 +08:00
|
|
|
static struct ir_raw_handler nec_handler = {
|
2010-03-26 10:49:46 +08:00
|
|
|
.decode = ir_nec_decode,
|
|
|
|
.raw_register = ir_nec_register,
|
|
|
|
.raw_unregister = ir_nec_unregister,
|
2010-03-25 07:47:53 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
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");
|