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1a1934fab0
The allowed and enabled protocol masks need to be expanded to be per filter type in order to support wakeup filter protocol selection. To ease that process abstract access to the rc_dev::allowed_protos and rc_dev::enabled_protocols members with inline functions. Signed-off-by: James Hogan <james.hogan@imgtec.com> Reviewed-by: Antti Seppälä <a.seppala@gmail.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
196 lines
4.8 KiB
C
196 lines
4.8 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 (!rc_protocols_enabled(dev, RC_BIT_SONY12 | RC_BIT_SONY15 |
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RC_BIT_SONY20))
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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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if (!rc_protocols_enabled(dev, RC_BIT_SONY12)) {
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data->state = STATE_INACTIVE;
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return 0;
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}
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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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if (!rc_protocols_enabled(dev, RC_BIT_SONY15)) {
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data->state = STATE_INACTIVE;
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return 0;
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}
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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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if (!rc_protocols_enabled(dev, RC_BIT_SONY20)) {
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data->state = STATE_INACTIVE;
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return 0;
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}
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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_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20,
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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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