aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/IR/ir-nec-decoder.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/IR/ir-nec-decoder.c')
-rw-r--r--drivers/media/IR/ir-nec-decoder.c328
1 files changed, 0 insertions, 328 deletions
diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c
deleted file mode 100644
index ba79233112e..00000000000
--- a/drivers/media/IR/ir-nec-decoder.c
+++ /dev/null
@@ -1,328 +0,0 @@
-/* ir-nec-decoder.c - handle NEC IR Pulse/Space protocol
- *
- * 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 <linux/bitrev.h>
-#include "ir-core-priv.h"
-
-#define NEC_NBITS 32
-#define NEC_UNIT 562500 /* ns */
-#define NEC_HEADER_PULSE (16 * NEC_UNIT)
-#define NECX_HEADER_PULSE (8 * NEC_UNIT) /* Less common NEC variant */
-#define NEC_HEADER_SPACE (8 * NEC_UNIT)
-#define NEC_REPEAT_SPACE (8 * NEC_UNIT)
-#define NEC_BIT_PULSE (1 * NEC_UNIT)
-#define NEC_BIT_0_SPACE (1 * NEC_UNIT)
-#define NEC_BIT_1_SPACE (3 * NEC_UNIT)
-#define NEC_TRAILER_PULSE (1 * NEC_UNIT)
-#define NEC_TRAILER_SPACE (10 * NEC_UNIT) /* even longer in reality */
-
-/* Used to register nec_decoder clients */
-static LIST_HEAD(decoder_list);
-static DEFINE_SPINLOCK(decoder_lock);
-
-enum nec_state {
- STATE_INACTIVE,
- STATE_HEADER_SPACE,
- STATE_BIT_PULSE,
- STATE_BIT_SPACE,
- STATE_TRAILER_PULSE,
- STATE_TRAILER_SPACE,
-};
-
-struct decoder_data {
- struct list_head list;
- struct ir_input_dev *ir_dev;
- int enabled:1;
-
- /* State machine control */
- enum nec_state state;
- u32 nec_bits;
- unsigned count;
-};
-
-
-/**
- * get_decoder_data() - gets decoder data
- * @input_dev: input device
- *
- * Returns the struct decoder_data that corresponds to a device
- */
-static struct decoder_data *get_decoder_data(struct ir_input_dev *ir_dev)
-{
- struct decoder_data *data = NULL;
-
- spin_lock(&decoder_lock);
- list_for_each_entry(data, &decoder_list, list) {
- if (data->ir_dev == ir_dev)
- break;
- }
- spin_unlock(&decoder_lock);
- return data;
-}
-
-static ssize_t store_enabled(struct device *d,
- struct device_attribute *mattr,
- const char *buf,
- size_t len)
-{
- unsigned long value;
- struct ir_input_dev *ir_dev = dev_get_drvdata(d);
- struct decoder_data *data = get_decoder_data(ir_dev);
-
- if (!data)
- return -EINVAL;
-
- if (strict_strtoul(buf, 10, &value) || value > 1)
- return -EINVAL;
-
- data->enabled = value;
-
- return len;
-}
-
-static ssize_t show_enabled(struct device *d,
- struct device_attribute *mattr, char *buf)
-{
- struct ir_input_dev *ir_dev = dev_get_drvdata(d);
- struct decoder_data *data = get_decoder_data(ir_dev);
-
- if (!data)
- return -EINVAL;
-
- if (data->enabled)
- return sprintf(buf, "1\n");
- else
- return sprintf(buf, "0\n");
-}
-
-static DEVICE_ATTR(enabled, S_IRUGO | S_IWUSR, show_enabled, store_enabled);
-
-static struct attribute *decoder_attributes[] = {
- &dev_attr_enabled.attr,
- NULL
-};
-
-static struct attribute_group decoder_attribute_group = {
- .name = "nec_decoder",
- .attrs = decoder_attributes,
-};
-
-/**
- * ir_nec_decode() - Decode one NEC pulse or space
- * @input_dev: the struct input_dev descriptor of the device
- * @duration: the struct ir_raw_event descriptor of the pulse/space
- *
- * This function returns -EINVAL if the pulse violates the state machine
- */
-static int ir_nec_decode(struct input_dev *input_dev, struct ir_raw_event ev)
-{
- struct decoder_data *data;
- struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
- u32 scancode;
- u8 address, not_address, command, not_command;
-
- data = get_decoder_data(ir_dev);
- if (!data)
- return -EINVAL;
-
- if (!data->enabled)
- return 0;
-
- if (IS_RESET(ev)) {
- data->state = STATE_INACTIVE;
- return 0;
- }
-
- IR_dprintk(2, "NEC decode started at state %d (%uus %s)\n",
- data->state, TO_US(ev.duration), TO_STR(ev.pulse));
-
- switch (data->state) {
-
- case STATE_INACTIVE:
- if (!ev.pulse)
- break;
-
- if (!eq_margin(ev.duration, NEC_HEADER_PULSE, NEC_UNIT / 2) &&
- !eq_margin(ev.duration, NECX_HEADER_PULSE, NEC_UNIT / 2))
- break;
-
- data->count = 0;
- data->state = STATE_HEADER_SPACE;
- return 0;
-
- case STATE_HEADER_SPACE:
- if (ev.pulse)
- break;
-
- if (eq_margin(ev.duration, NEC_HEADER_SPACE, NEC_UNIT / 2)) {
- data->state = STATE_BIT_PULSE;
- return 0;
- } else if (eq_margin(ev.duration, NEC_REPEAT_SPACE, NEC_UNIT / 2)) {
- ir_repeat(input_dev);
- IR_dprintk(1, "Repeat last key\n");
- data->state = STATE_TRAILER_PULSE;
- return 0;
- }
-
- break;
-
- case STATE_BIT_PULSE:
- if (!ev.pulse)
- break;
-
- if (!eq_margin(ev.duration, NEC_BIT_PULSE, NEC_UNIT / 2))
- break;
-
- data->state = STATE_BIT_SPACE;
- return 0;
-
- case STATE_BIT_SPACE:
- if (ev.pulse)
- break;
-
- data->nec_bits <<= 1;
- if (eq_margin(ev.duration, NEC_BIT_1_SPACE, NEC_UNIT / 2))
- data->nec_bits |= 1;
- else if (!eq_margin(ev.duration, NEC_BIT_0_SPACE, NEC_UNIT / 2))
- break;
- data->count++;
-
- if (data->count == NEC_NBITS)
- data->state = STATE_TRAILER_PULSE;
- else
- data->state = STATE_BIT_PULSE;
-
- return 0;
-
- case STATE_TRAILER_PULSE:
- if (!ev.pulse)
- break;
-
- if (!eq_margin(ev.duration, NEC_TRAILER_PULSE, NEC_UNIT / 2))
- break;
-
- data->state = STATE_TRAILER_SPACE;
- return 0;
-
- case STATE_TRAILER_SPACE:
- if (ev.pulse)
- break;
-
- if (!geq_margin(ev.duration, NEC_TRAILER_SPACE, NEC_UNIT / 2))
- break;
-
- 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;
- }
-
- 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);
- }
-
- ir_keydown(input_dev, scancode, 0);
- data->state = STATE_INACTIVE;
- return 0;
- }
-
- IR_dprintk(1, "NEC decode failed at state %d (%uus %s)\n",
- data->state, TO_US(ev.duration), TO_STR(ev.pulse));
- data->state = STATE_INACTIVE;
- return -EINVAL;
-}
-
-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;
-}
-
-static struct ir_raw_handler nec_handler = {
- .decode = ir_nec_decode,
- .raw_register = ir_nec_register,
- .raw_unregister = ir_nec_unregister,
-};
-
-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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-20 11:27:48 +0000