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path: root/drivers/media/IR/ir-rc5-decoder.c
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Diffstat (limited to 'drivers/media/IR/ir-rc5-decoder.c')
-rw-r--r--drivers/media/IR/ir-rc5-decoder.c324
1 files changed, 0 insertions, 324 deletions
diff --git a/drivers/media/IR/ir-rc5-decoder.c b/drivers/media/IR/ir-rc5-decoder.c
deleted file mode 100644
index 23cdb1b1a3b..00000000000
--- a/drivers/media/IR/ir-rc5-decoder.c
+++ /dev/null
@@ -1,324 +0,0 @@
-/* ir-rc5-decoder.c - handle RC5(x) 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.
- */
-
-/*
- * This code handles 14 bits RC5 protocols and 20 bits RC5x protocols.
- * There are other variants that use a different number of bits.
- * This is currently unsupported.
- * It considers a carrier of 36 kHz, with a total of 14/20 bits, where
- * the first two bits are start bits, and a third one is a filing bit
- */
-
-#include "ir-core-priv.h"
-
-#define RC5_NBITS 14
-#define RC5X_NBITS 20
-#define CHECK_RC5X_NBITS 8
-#define RC5_UNIT 888888 /* ns */
-#define RC5_BIT_START (1 * RC5_UNIT)
-#define RC5_BIT_END (1 * RC5_UNIT)
-#define RC5X_SPACE (4 * RC5_UNIT)
-
-/* Used to register rc5_decoder clients */
-static LIST_HEAD(decoder_list);
-static DEFINE_SPINLOCK(decoder_lock);
-
-enum rc5_state {
- STATE_INACTIVE,
- STATE_BIT_START,
- STATE_BIT_END,
- STATE_CHECK_RC5X,
- STATE_FINISHED,
-};
-
-struct decoder_data {
- struct list_head list;
- struct ir_input_dev *ir_dev;
- int enabled:1;
-
- /* State machine control */
- enum rc5_state state;
- u32 rc5_bits;
- struct ir_raw_event prev_ev;
- unsigned count;
- unsigned wanted_bits;
-};
-
-
-/**
- * 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 = "rc5_decoder",
- .attrs = decoder_attributes,
-};
-
-/**
- * ir_rc5_decode() - Decode one RC-5 pulse or space
- * @input_dev: the struct input_dev descriptor of the device
- * @ev: the struct ir_raw_event descriptor of the pulse/space
- *
- * This function returns -EINVAL if the pulse violates the state machine
- */
-static int ir_rc5_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);
- u8 toggle;
- u32 scancode;
-
- 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;
- }
-
- if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
- goto out;
-
-again:
- IR_dprintk(2, "RC5(x) decode started at state %i (%uus %s)\n",
- data->state, TO_US(ev.duration), TO_STR(ev.pulse));
-
- if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2))
- return 0;
-
- switch (data->state) {
-
- case STATE_INACTIVE:
- if (!ev.pulse)
- break;
-
- data->state = STATE_BIT_START;
- data->count = 1;
- /* We just need enough bits to get to STATE_CHECK_RC5X */
- data->wanted_bits = RC5X_NBITS;
- decrease_duration(&ev, RC5_BIT_START);
- goto again;
-
- case STATE_BIT_START:
- if (!eq_margin(ev.duration, RC5_BIT_START, RC5_UNIT / 2))
- break;
-
- data->rc5_bits <<= 1;
- if (!ev.pulse)
- data->rc5_bits |= 1;
- data->count++;
- data->prev_ev = ev;
- data->state = STATE_BIT_END;
- return 0;
-
- case STATE_BIT_END:
- if (!is_transition(&ev, &data->prev_ev))
- break;
-
- if (data->count == data->wanted_bits)
- data->state = STATE_FINISHED;
- else if (data->count == CHECK_RC5X_NBITS)
- data->state = STATE_CHECK_RC5X;
- else
- data->state = STATE_BIT_START;
-
- decrease_duration(&ev, RC5_BIT_END);
- goto again;
-
- case STATE_CHECK_RC5X:
- if (!ev.pulse && geq_margin(ev.duration, RC5X_SPACE, RC5_UNIT / 2)) {
- /* RC5X */
- data->wanted_bits = RC5X_NBITS;
- decrease_duration(&ev, RC5X_SPACE);
- } else {
- /* RC5 */
- data->wanted_bits = RC5_NBITS;
- }
- data->state = STATE_BIT_START;
- goto again;
-
- case STATE_FINISHED:
- if (ev.pulse)
- break;
-
- if (data->wanted_bits == RC5X_NBITS) {
- /* RC5X */
- u8 xdata, command, system;
- xdata = (data->rc5_bits & 0x0003F) >> 0;
- command = (data->rc5_bits & 0x00FC0) >> 6;
- system = (data->rc5_bits & 0x1F000) >> 12;
- toggle = (data->rc5_bits & 0x20000) ? 1 : 0;
- command += (data->rc5_bits & 0x01000) ? 0 : 0x40;
- scancode = system << 16 | command << 8 | xdata;
-
- IR_dprintk(1, "RC5X scancode 0x%06x (toggle: %u)\n",
- scancode, toggle);
-
- } else {
- /* RC5 */
- u8 command, system;
- command = (data->rc5_bits & 0x0003F) >> 0;
- system = (data->rc5_bits & 0x007C0) >> 6;
- toggle = (data->rc5_bits & 0x00800) ? 1 : 0;
- command += (data->rc5_bits & 0x01000) ? 0 : 0x40;
- scancode = system << 8 | command;
-
- IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n",
- scancode, toggle);
- }
-
- ir_keydown(input_dev, scancode, toggle);
- data->state = STATE_INACTIVE;
- return 0;
- }
-
-out:
- IR_dprintk(1, "RC5(x) decode failed at state %i (%uus %s)\n",
- data->state, TO_US(ev.duration), TO_STR(ev.pulse));
- data->state = STATE_INACTIVE;
- return -EINVAL;
-}
-
-static int ir_rc5_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_rc5_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 rc5_handler = {
- .decode = ir_rc5_decode,
- .raw_register = ir_rc5_register,
- .raw_unregister = ir_rc5_unregister,
-};
-
-static int __init ir_rc5_decode_init(void)
-{
- ir_raw_handler_register(&rc5_handler);
-
- printk(KERN_INFO "IR RC5(x) protocol handler initialized\n");
- return 0;
-}
-
-static void __exit ir_rc5_decode_exit(void)
-{
- ir_raw_handler_unregister(&rc5_handler);
-}
-
-module_init(ir_rc5_decode_init);
-module_exit(ir_rc5_decode_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
-MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
-MODULE_DESCRIPTION("RC5(x) IR protocol decoder");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-15 10:11:01 +0000