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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245// SPDX-License-Identifier: GPL-2.0-only/* ir-sharp-decoder.c - handle Sharp IR Pulse/Space protocol * * Copyright (C) 2013-2014 Imagination Technologies Ltd. * * Based on NEC decoder: * Copyright (C) 2010 by Mauro Carvalho Chehab */
#include <linux/bitrev.h>#include <linux/module.h>#include "rc-core-priv.h"
#define SHARP_NBITS 15#define SHARP_UNIT 40 /* us */#define SHARP_BIT_PULSE (8 * SHARP_UNIT) /* 320us */#define SHARP_BIT_0_PERIOD (25 * SHARP_UNIT) /* 1ms (680us space) */#define SHARP_BIT_1_PERIOD (50 * SHARP_UNIT) /* 2ms (1680us space) */#define SHARP_BIT_0_SPACE (17 * SHARP_UNIT) /* 680us space */#define SHARP_BIT_1_SPACE (42 * SHARP_UNIT) /* 1680us space */#define SHARP_ECHO_SPACE (1000 * SHARP_UNIT) /* 40 ms */#define SHARP_TRAILER_SPACE (125 * SHARP_UNIT) /* 5 ms (even longer) */
enum sharp_state { STATE_INACTIVE, STATE_BIT_PULSE, STATE_BIT_SPACE, STATE_TRAILER_PULSE, STATE_ECHO_SPACE, STATE_TRAILER_SPACE,};
/** * ir_sharp_decode() - Decode one Sharp pulse or space * @dev: the struct rc_dev descriptor of the device * @ev: the struct ir_raw_event descriptor of the pulse/space * * This function returns -EINVAL if the pulse violates the state machine */static int ir_sharp_decode(struct rc_dev *dev, struct ir_raw_event ev){ struct sharp_dec *data = &dev->raw->sharp; u32 msg, echo, address, command, scancode;
if (!is_timing_event(ev)) { if (ev.overflow) data->state = STATE_INACTIVE; return 0; }
dev_dbg(&dev->dev, "Sharp decode started at state %d (%uus %s)\n", data->state, ev.duration, TO_STR(ev.pulse));
switch (data->state) {
case STATE_INACTIVE: if (!ev.pulse) break;
if (!eq_margin(ev.duration, SHARP_BIT_PULSE, SHARP_BIT_PULSE / 2)) break;
data->count = 0; data->pulse_len = ev.duration; data->state = STATE_BIT_SPACE; return 0;
case STATE_BIT_PULSE: if (!ev.pulse) break;
if (!eq_margin(ev.duration, SHARP_BIT_PULSE, SHARP_BIT_PULSE / 2)) break;
data->pulse_len = ev.duration; data->state = STATE_BIT_SPACE; return 0;
case STATE_BIT_SPACE: if (ev.pulse) break;
data->bits <<= 1; if (eq_margin(data->pulse_len + ev.duration, SHARP_BIT_1_PERIOD, SHARP_BIT_PULSE * 2)) data->bits |= 1; else if (!eq_margin(data->pulse_len + ev.duration, SHARP_BIT_0_PERIOD, SHARP_BIT_PULSE * 2)) break; data->count++;
if (data->count == SHARP_NBITS || data->count == SHARP_NBITS * 2) 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, SHARP_BIT_PULSE, SHARP_BIT_PULSE / 2)) break;
if (data->count == SHARP_NBITS) { /* exp,chk bits should be 1,0 */ if ((data->bits & 0x3) != 0x2 && /* DENON variant, both chk bits 0 */ (data->bits & 0x3) != 0x0) break; data->state = STATE_ECHO_SPACE; } else { data->state = STATE_TRAILER_SPACE; } return 0;
case STATE_ECHO_SPACE: if (ev.pulse) break;
if (!eq_margin(ev.duration, SHARP_ECHO_SPACE, SHARP_ECHO_SPACE / 4)) break;
data->state = STATE_BIT_PULSE;
return 0;
case STATE_TRAILER_SPACE: if (ev.pulse) break;
if (!geq_margin(ev.duration, SHARP_TRAILER_SPACE, SHARP_BIT_PULSE / 2)) break;
/* Validate - command, ext, chk should be inverted in 2nd */ msg = (data->bits >> 15) & 0x7fff; echo = data->bits & 0x7fff; if ((msg ^ echo) != 0x3ff) { dev_dbg(&dev->dev, "Sharp checksum error: received 0x%04x, 0x%04x\n", msg, echo); break; }
address = bitrev8((msg >> 7) & 0xf8); command = bitrev8((msg >> 2) & 0xff);
scancode = address << 8 | command; dev_dbg(&dev->dev, "Sharp scancode 0x%04x\n", scancode);
rc_keydown(dev, RC_PROTO_SHARP, scancode, 0); data->state = STATE_INACTIVE; return 0; }
dev_dbg(&dev->dev, "Sharp decode failed at count %d state %d (%uus %s)\n", data->count, data->state, ev.duration, TO_STR(ev.pulse)); data->state = STATE_INACTIVE; return -EINVAL;}
static const struct ir_raw_timings_pd ir_sharp_timings = { .header_pulse = 0, .header_space = 0, .bit_pulse = SHARP_BIT_PULSE, .bit_space[0] = SHARP_BIT_0_SPACE, .bit_space[1] = SHARP_BIT_1_SPACE, .trailer_pulse = SHARP_BIT_PULSE, .trailer_space = SHARP_ECHO_SPACE, .msb_first = 1,};
/** * ir_sharp_encode() - Encode a scancode as a stream of raw events * * @protocol: protocol to encode * @scancode: scancode to encode * @events: array of raw ir events to write into * @max: maximum size of @events * * Returns: The number of events written. * -ENOBUFS if there isn't enough space in the array to fit the * encoding. In this case all @max events will have been written. */static int ir_sharp_encode(enum rc_proto protocol, u32 scancode, struct ir_raw_event *events, unsigned int max){ struct ir_raw_event *e = events; int ret; u32 raw;
raw = (((bitrev8(scancode >> 8) >> 3) << 8) & 0x1f00) | bitrev8(scancode); ret = ir_raw_gen_pd(&e, max, &ir_sharp_timings, SHARP_NBITS, (raw << 2) | 2); if (ret < 0) return ret;
max -= ret;
raw = (((bitrev8(scancode >> 8) >> 3) << 8) & 0x1f00) | bitrev8(~scancode); ret = ir_raw_gen_pd(&e, max, &ir_sharp_timings, SHARP_NBITS, (raw << 2) | 1); if (ret < 0) return ret;
return e - events;}
static struct ir_raw_handler sharp_handler = { .protocols = RC_PROTO_BIT_SHARP, .decode = ir_sharp_decode, .encode = ir_sharp_encode, .carrier = 38000, .min_timeout = SHARP_ECHO_SPACE + SHARP_ECHO_SPACE / 4,};
static int __init ir_sharp_decode_init(void){ ir_raw_handler_register(&sharp_handler);
pr_info("IR Sharp protocol handler initialized\n"); return 0;}
static void __exit ir_sharp_decode_exit(void){ ir_raw_handler_unregister(&sharp_handler);}
module_init(ir_sharp_decode_init);module_exit(ir_sharp_decode_exit);
MODULE_LICENSE("GPL");MODULE_AUTHOR("James Hogan <jhogan@kernel.org>");MODULE_DESCRIPTION("Sharp IR protocol decoder");