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path: root/drivers/media/IR/ir-jvc-decoder.c
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Diffstat (limited to 'drivers/media/IR/ir-jvc-decoder.c')
-rw-r--r--drivers/media/IR/ir-jvc-decoder.c320
1 files changed, 0 insertions, 320 deletions
diff --git a/drivers/media/IR/ir-jvc-decoder.c b/drivers/media/IR/ir-jvc-decoder.c
deleted file mode 100644
index 0b804944cbb..00000000000
--- a/drivers/media/IR/ir-jvc-decoder.c
+++ /dev/null
@@ -1,320 +0,0 @@
-/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol
- *
- * Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
- *
- * 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 JVC_NBITS 16 /* dev(8) + func(8) */
-#define JVC_UNIT 525000 /* ns */
-#define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */
-#define JVC_HEADER_SPACE (8 * JVC_UNIT)
-#define JVC_BIT_PULSE (1 * JVC_UNIT)
-#define JVC_BIT_0_SPACE (1 * JVC_UNIT)
-#define JVC_BIT_1_SPACE (3 * JVC_UNIT)
-#define JVC_TRAILER_PULSE (1 * JVC_UNIT)
-#define JVC_TRAILER_SPACE (35 * JVC_UNIT)
-
-/* Used to register jvc_decoder clients */
-static LIST_HEAD(decoder_list);
-DEFINE_SPINLOCK(decoder_lock);
-
-enum jvc_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 jvc_state state;
- u16 jvc_bits;
- u16 jvc_old_bits;
- unsigned count;
- bool first;
- bool toggle;
-};
-
-
-/**
- * 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 = "jvc_decoder",
- .attrs = decoder_attributes,
-};
-
-/**
- * ir_jvc_decode() - Decode one JVC 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_jvc_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);
-
- 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, JVC_UNIT, JVC_UNIT / 2))
- goto out;
-
- IR_dprintk(2, "JVC 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, JVC_HEADER_PULSE, JVC_UNIT / 2))
- break;
-
- data->count = 0;
- data->first = true;
- data->toggle = !data->toggle;
- data->state = STATE_HEADER_SPACE;
- return 0;
-
- case STATE_HEADER_SPACE:
- if (ev.pulse)
- break;
-
- if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2))
- break;
-
- data->state = STATE_BIT_PULSE;
- return 0;
-
- case STATE_BIT_PULSE:
- if (!ev.pulse)
- break;
-
- if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2))
- break;
-
- data->state = STATE_BIT_SPACE;
- return 0;
-
- case STATE_BIT_SPACE:
- if (ev.pulse)
- break;
-
- data->jvc_bits <<= 1;
- if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) {
- data->jvc_bits |= 1;
- decrease_duration(&ev, JVC_BIT_1_SPACE);
- } else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2))
- decrease_duration(&ev, JVC_BIT_0_SPACE);
- else
- break;
- data->count++;
-
- if (data->count == JVC_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, JVC_TRAILER_PULSE, JVC_UNIT / 2))
- break;
-
- data->state = STATE_TRAILER_SPACE;
- return 0;
-
- case STATE_TRAILER_SPACE:
- if (ev.pulse)
- break;
-
- if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2))
- break;
-
- if (data->first) {
- u32 scancode;
- scancode = (bitrev8((data->jvc_bits >> 8) & 0xff) << 8) |
- (bitrev8((data->jvc_bits >> 0) & 0xff) << 0);
- IR_dprintk(1, "JVC scancode 0x%04x\n", scancode);
- ir_keydown(input_dev, scancode, data->toggle);
- data->first = false;
- data->jvc_old_bits = data->jvc_bits;
- } else if (data->jvc_bits == data->jvc_old_bits) {
- IR_dprintk(1, "JVC repeat\n");
- ir_repeat(input_dev);
- } else {
- IR_dprintk(1, "JVC invalid repeat msg\n");
- break;
- }
-
- data->count = 0;
- data->state = STATE_BIT_PULSE;
- return 0;
- }
-
-out:
- IR_dprintk(1, "JVC 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_jvc_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_jvc_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 jvc_handler = {
- .decode = ir_jvc_decode,
- .raw_register = ir_jvc_register,
- .raw_unregister = ir_jvc_unregister,
-};
-
-static int __init ir_jvc_decode_init(void)
-{
- ir_raw_handler_register(&jvc_handler);
-
- printk(KERN_INFO "IR JVC protocol handler initialized\n");
- return 0;
-}
-
-static void __exit ir_jvc_decode_exit(void)
-{
- ir_raw_handler_unregister(&jvc_handler);
-}
-
-module_init(ir_jvc_decode_init);
-module_exit(ir_jvc_decode_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
-MODULE_DESCRIPTION("JVC IR protocol decoder");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-21 09:16:04 +0000