diff options
author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-03-20 20:59:44 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-05-18 00:52:56 -0300 |
commit | a3572c34da8dacc78a629211a91cf34e9b408701 (patch) | |
tree | 281efd4d69b68bd4720668fd91cfcf16d1ed3089 /drivers/media/IR/ir-raw-event.c | |
parent | 0210894956cf57d525d56341cc3e0f3d5d2db659 (diff) |
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>
Diffstat (limited to 'drivers/media/IR/ir-raw-event.c')
-rw-r--r-- | drivers/media/IR/ir-raw-event.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c new file mode 100644 index 000000000000..9c71ac858923 --- /dev/null +++ b/drivers/media/IR/ir-raw-event.c @@ -0,0 +1,117 @@ +/* ir-raw-event.c - handle IR Pulse/Space event + * + * 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> + +/* Define the max number of bit transitions per IR keycode */ +#define MAX_IR_EVENT_SIZE 256 + +int ir_raw_event_register(struct input_dev *input_dev) +{ + struct ir_input_dev *ir = input_get_drvdata(input_dev); + int rc, size; + + ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); + + size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2; + size = roundup_pow_of_two(size); + + rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL); + + return rc; +} +EXPORT_SYMBOL_GPL(ir_raw_event_register); + +void ir_raw_event_unregister(struct input_dev *input_dev) +{ + struct ir_input_dev *ir = input_get_drvdata(input_dev); + + if (!ir->raw) + return; + + kfifo_free(&ir->raw->kfifo); + kfree(ir->raw); + ir->raw = NULL; +} +EXPORT_SYMBOL_GPL(ir_raw_event_unregister); + +int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type) +{ + struct ir_input_dev *ir = input_get_drvdata(input_dev); + struct timespec ts; + struct ir_raw_event event; + int rc; + + if (!ir->raw) + return -EINVAL; + + event.type = type; + event.delta.tv_sec = 0; + event.delta.tv_nsec = 0; + + ktime_get_ts(&ts); + + if (timespec_equal(&ir->raw->last_event, &event.delta)) + event.type |= IR_START_EVENT; + else + event.delta = timespec_sub(ts, ir->raw->last_event); + + memcpy(&ir->raw->last_event, &ts, sizeof(ts)); + + if (event.delta.tv_sec) { + event.type |= IR_START_EVENT; + event.delta.tv_sec = 0; + event.delta.tv_nsec = 0; + } + + kfifo_in(&ir->raw->kfifo, &event, sizeof(event)); + + return rc; +} +EXPORT_SYMBOL_GPL(ir_raw_event_store); + +int ir_raw_event_handle(struct input_dev *input_dev) +{ + struct ir_input_dev *ir = input_get_drvdata(input_dev); + int rc; + struct ir_raw_event *evs; + int len, i; + + /* + * Store the events into a temporary buffer. This allows calling more than + * one decoder to deal with the received data + */ + len = kfifo_len(&ir->raw->kfifo) / sizeof(*evs); + if (!len) + return 0; + evs = kmalloc(len * sizeof(*evs), GFP_ATOMIC); + + for (i = 0; i < len; i++) { + rc = kfifo_out(&ir->raw->kfifo, &evs[i], sizeof(*evs)); + if (rc != sizeof(*evs)) { + IR_dprintk(1, "overflow error: received %d instead of %zd\n", + rc, sizeof(*evs)); + return -EINVAL; + } + IR_dprintk(2, "event type %d, time before event: %07luus\n", + evs[i].type, (evs[i].delta.tv_nsec + 500) / 1000); + } + + rc = ir_nec_decode(input_dev, evs, len); + + kfree(evs); + + return rc; +} +EXPORT_SYMBOL_GPL(ir_raw_event_handle); |