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240 lines
5.8 KiB
240 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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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 600 /* us */ |
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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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enum rc_proto protocol; |
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u32 scancode; |
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u8 device, subdevice, function; |
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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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dev_dbg(&dev->dev, "Sony decode started at state %d (%uus %s)\n", |
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data->state, 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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fallthrough; |
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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 (!(dev->enabled_protocols & RC_PROTO_BIT_SONY12)) |
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goto finish_state_machine; |
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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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protocol = RC_PROTO_SONY12; |
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break; |
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case 15: |
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if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY15)) |
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goto finish_state_machine; |
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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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protocol = RC_PROTO_SONY15; |
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break; |
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case 20: |
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if (!(dev->enabled_protocols & RC_PROTO_BIT_SONY20)) |
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goto finish_state_machine; |
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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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protocol = RC_PROTO_SONY20; |
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break; |
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default: |
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dev_dbg(&dev->dev, "Sony invalid bitcount %u\n", |
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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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dev_dbg(&dev->dev, "Sony(%u) scancode 0x%05x\n", data->count, |
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scancode); |
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rc_keydown(dev, protocol, scancode, 0); |
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goto finish_state_machine; |
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} |
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out: |
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dev_dbg(&dev->dev, "Sony decode failed at state %d (%uus %s)\n", |
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data->state, ev.duration, TO_STR(ev.pulse)); |
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data->state = STATE_INACTIVE; |
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return -EINVAL; |
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finish_state_machine: |
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data->state = STATE_INACTIVE; |
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return 0; |
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} |
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static const struct ir_raw_timings_pl ir_sony_timings = { |
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.header_pulse = SONY_HEADER_PULSE, |
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.bit_space = SONY_BIT_SPACE, |
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.bit_pulse[0] = SONY_BIT_0_PULSE, |
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.bit_pulse[1] = SONY_BIT_1_PULSE, |
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.trailer_space = SONY_TRAILER_SPACE + SONY_BIT_SPACE, |
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.msb_first = 0, |
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}; |
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/** |
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* ir_sony_encode() - Encode a scancode as a stream of raw events |
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* |
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* @protocol: protocol to encode |
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* @scancode: scancode to encode |
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* @events: array of raw ir events to write into |
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* @max: maximum size of @events |
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* |
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* Returns: The number of events written. |
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* -ENOBUFS if there isn't enough space in the array to fit the |
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* encoding. In this case all @max events will have been written. |
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*/ |
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static int ir_sony_encode(enum rc_proto protocol, u32 scancode, |
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struct ir_raw_event *events, unsigned int max) |
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{ |
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struct ir_raw_event *e = events; |
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u32 raw, len; |
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int ret; |
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if (protocol == RC_PROTO_SONY12) { |
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raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9); |
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len = 12; |
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} else if (protocol == RC_PROTO_SONY15) { |
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raw = (scancode & 0x7f) | ((scancode & 0xff0000) >> 9); |
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len = 15; |
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} else { |
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raw = (scancode & 0x7f) | ((scancode & 0x1f0000) >> 9) | |
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((scancode & 0xff00) << 4); |
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len = 20; |
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} |
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ret = ir_raw_gen_pl(&e, max, &ir_sony_timings, len, raw); |
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if (ret < 0) |
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return ret; |
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return e - events; |
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} |
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static struct ir_raw_handler sony_handler = { |
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.protocols = RC_PROTO_BIT_SONY12 | RC_PROTO_BIT_SONY15 | |
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RC_PROTO_BIT_SONY20, |
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.decode = ir_sony_decode, |
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.encode = ir_sony_encode, |
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.carrier = 40000, |
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.min_timeout = SONY_TRAILER_SPACE, |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Sony IR protocol decoder");
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