313 lines
7.2 KiB
C
313 lines
7.2 KiB
C
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/* ir-sony-decoder.c - handle Sony IR Pulse/Space protocol
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*
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* Copyright (C) 2010 by David Härdeman <david@hardeman.nu>
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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 <linux/bitrev.h>
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#include "ir-core-priv.h"
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#define SONY_UNIT 600000 /* ns */
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#define SONY_HEADER_PULSE (4 * SONY_UNIT)
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#define SONY_HEADER_SPACE (1 * SONY_UNIT)
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#define SONY_BIT_0_PULSE (1 * SONY_UNIT)
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#define SONY_BIT_1_PULSE (2 * SONY_UNIT)
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#define SONY_BIT_SPACE (1 * SONY_UNIT)
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#define SONY_TRAILER_SPACE (10 * SONY_UNIT) /* minimum */
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/* Used to register sony_decoder clients */
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static LIST_HEAD(decoder_list);
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static DEFINE_SPINLOCK(decoder_lock);
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enum sony_state {
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STATE_INACTIVE,
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STATE_HEADER_SPACE,
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STATE_BIT_PULSE,
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STATE_BIT_SPACE,
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STATE_FINISHED,
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};
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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;
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/* State machine control */
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enum sony_state state;
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u32 sony_bits;
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unsigned count;
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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 = "sony_decoder",
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.attrs = decoder_attributes,
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};
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/**
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* ir_sony_decode() - Decode one Sony pulse or space
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* @input_dev: the struct input_dev descriptor of the device
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* @ev: the struct ir_raw_event descriptor of the pulse/space
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*
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* This function returns -EINVAL if the pulse violates the state machine
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*/
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static int ir_sony_decode(struct input_dev *input_dev, struct ir_raw_event ev)
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{
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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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u32 scancode;
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u8 device, subdevice, function;
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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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if (!data->enabled)
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return 0;
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if (IS_RESET(ev)) {
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data->state = STATE_INACTIVE;
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return 0;
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}
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if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2))
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goto out;
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IR_dprintk(2, "Sony decode started at state %d (%uus %s)\n",
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data->state, TO_US(ev.duration), TO_STR(ev.pulse));
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switch (data->state) {
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case STATE_INACTIVE:
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if (!ev.pulse)
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break;
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if (!eq_margin(ev.duration, SONY_HEADER_PULSE, SONY_UNIT / 2))
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break;
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data->count = 0;
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data->state = STATE_HEADER_SPACE;
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return 0;
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case STATE_HEADER_SPACE:
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if (ev.pulse)
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break;
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if (!eq_margin(ev.duration, SONY_HEADER_SPACE, SONY_UNIT / 2))
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break;
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data->state = STATE_BIT_PULSE;
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return 0;
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case STATE_BIT_PULSE:
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if (!ev.pulse)
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break;
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data->sony_bits <<= 1;
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if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
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data->sony_bits |= 1;
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else if (!eq_margin(ev.duration, SONY_BIT_0_PULSE, SONY_UNIT / 2))
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break;
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data->count++;
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data->state = STATE_BIT_SPACE;
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return 0;
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case STATE_BIT_SPACE:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, SONY_BIT_SPACE, SONY_UNIT / 2))
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break;
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decrease_duration(&ev, SONY_BIT_SPACE);
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if (!geq_margin(ev.duration, SONY_UNIT, SONY_UNIT / 2)) {
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data->state = STATE_BIT_PULSE;
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return 0;
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}
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data->state = STATE_FINISHED;
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/* Fall through */
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case STATE_FINISHED:
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if (ev.pulse)
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break;
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if (!geq_margin(ev.duration, SONY_TRAILER_SPACE, SONY_UNIT / 2))
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break;
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switch (data->count) {
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case 12:
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device = bitrev8((data->sony_bits << 3) & 0xF8);
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subdevice = 0;
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function = bitrev8((data->sony_bits >> 4) & 0xFE);
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break;
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case 15:
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device = bitrev8((data->sony_bits >> 0) & 0xFF);
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subdevice = 0;
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function = bitrev8((data->sony_bits >> 7) & 0xFD);
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break;
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case 20:
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device = bitrev8((data->sony_bits >> 5) & 0xF8);
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subdevice = bitrev8((data->sony_bits >> 0) & 0xFF);
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function = bitrev8((data->sony_bits >> 12) & 0xFE);
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break;
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default:
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IR_dprintk(1, "Sony invalid bitcount %u\n", data->count);
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goto out;
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}
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scancode = device << 16 | subdevice << 8 | function;
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IR_dprintk(1, "Sony(%u) scancode 0x%05x\n", data->count, scancode);
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ir_keydown(input_dev, scancode, 0);
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data->state = STATE_INACTIVE;
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return 0;
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}
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out:
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IR_dprintk(1, "Sony decode failed at state %d (%uus %s)\n",
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data->state, TO_US(ev.duration), TO_STR(ev.pulse));
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data->state = STATE_INACTIVE;
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return -EINVAL;
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}
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static int ir_sony_register(struct input_dev *input_dev)
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{
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struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
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struct decoder_data *data;
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int rc;
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rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group);
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if (rc < 0)
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return rc;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data) {
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sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
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return -ENOMEM;
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}
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data->ir_dev = ir_dev;
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data->enabled = 1;
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spin_lock(&decoder_lock);
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list_add_tail(&data->list, &decoder_list);
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spin_unlock(&decoder_lock);
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return 0;
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}
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static int ir_sony_unregister(struct input_dev *input_dev)
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{
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struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
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static struct decoder_data *data;
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data = get_decoder_data(ir_dev);
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if (!data)
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return 0;
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sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group);
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spin_lock(&decoder_lock);
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list_del(&data->list);
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spin_unlock(&decoder_lock);
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return 0;
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}
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static struct ir_raw_handler sony_handler = {
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.decode = ir_sony_decode,
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.raw_register = ir_sony_register,
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.raw_unregister = ir_sony_unregister,
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};
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static int __init ir_sony_decode_init(void)
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{
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ir_raw_handler_register(&sony_handler);
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printk(KERN_INFO "IR Sony protocol handler initialized\n");
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return 0;
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}
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static void __exit ir_sony_decode_exit(void)
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{
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ir_raw_handler_unregister(&sony_handler);
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}
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module_init(ir_sony_decode_init);
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module_exit(ir_sony_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("David Härdeman <david@hardeman.nu>");
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MODULE_DESCRIPTION("Sony IR protocol decoder");
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