![James Hogan](/assets/img/avatar_default.png)
The raw Sony IR decoder decodes 15bit messages slightly incorrectly. To decode the function number, it shifts the bits right by 7 so that the function is in bits 7:1, masks with 0xFD (0b11111101), and does an 8 bit reverse so it ends up in bits 6:0. The mask should be 0xFE to correspond with bits 7:1 (0b11111110). The old mask had the effect of dropping the MSB of the function number from bit 6, and leaving the LSB of the device number in bit 7. Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
183 lines
4.4 KiB
C
183 lines
4.4 KiB
C
/* 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 <linux/module.h>
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#include "rc-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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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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/**
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* ir_sony_decode() - Decode one Sony pulse or space
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* @dev: the struct rc_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 rc_dev *dev, struct ir_raw_event ev)
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{
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struct sony_dec *data = &dev->raw->sony;
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u32 scancode;
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u8 device, subdevice, function;
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if (!(dev->raw->enabled_protocols & RC_TYPE_SONY))
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return 0;
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if (!is_timing_event(ev)) {
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if (ev.reset)
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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->bits <<= 1;
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if (eq_margin(ev.duration, SONY_BIT_1_PULSE, SONY_UNIT / 2))
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data->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->bits << 3) & 0xF8);
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subdevice = 0;
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function = bitrev8((data->bits >> 4) & 0xFE);
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break;
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case 15:
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device = bitrev8((data->bits >> 0) & 0xFF);
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subdevice = 0;
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function = bitrev8((data->bits >> 7) & 0xFE);
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break;
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case 20:
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device = bitrev8((data->bits >> 5) & 0xF8);
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subdevice = bitrev8((data->bits >> 0) & 0xFF);
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function = bitrev8((data->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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rc_keydown(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 struct ir_raw_handler sony_handler = {
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.protocols = RC_TYPE_SONY,
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.decode = ir_sony_decode,
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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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