From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/media/rc/ir-rc6-decoder.c | 319 +++++++++++++++++++++++++++++++ 1 file changed, 319 insertions(+) create mode 100644 kernel/drivers/media/rc/ir-rc6-decoder.c (limited to 'kernel/drivers/media/rc/ir-rc6-decoder.c') diff --git a/kernel/drivers/media/rc/ir-rc6-decoder.c b/kernel/drivers/media/rc/ir-rc6-decoder.c new file mode 100644 index 000000000..d16bc67af --- /dev/null +++ b/kernel/drivers/media/rc/ir-rc6-decoder.c @@ -0,0 +1,319 @@ +/* ir-rc6-decoder.c - A decoder for the RC6 IR protocol + * + * Copyright (C) 2010 by David Härdeman + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include "rc-core-priv.h" +#include + +/* + * This decoder currently supports: + * RC6-0-16 (standard toggle bit in header) + * RC6-6A-20 (no toggle bit) + * RC6-6A-24 (no toggle bit) + * RC6-6A-32 (MCE version with toggle bit in body) + */ + +#define RC6_UNIT 444444 /* nanosecs */ +#define RC6_HEADER_NBITS 4 /* not including toggle bit */ +#define RC6_0_NBITS 16 +#define RC6_6A_32_NBITS 32 +#define RC6_6A_NBITS 128 /* Variable 8..128 */ +#define RC6_PREFIX_PULSE (6 * RC6_UNIT) +#define RC6_PREFIX_SPACE (2 * RC6_UNIT) +#define RC6_BIT_START (1 * RC6_UNIT) +#define RC6_BIT_END (1 * RC6_UNIT) +#define RC6_TOGGLE_START (2 * RC6_UNIT) +#define RC6_TOGGLE_END (2 * RC6_UNIT) +#define RC6_SUFFIX_SPACE (6 * RC6_UNIT) +#define RC6_MODE_MASK 0x07 /* for the header bits */ +#define RC6_STARTBIT_MASK 0x08 /* for the header bits */ +#define RC6_6A_MCE_TOGGLE_MASK 0x8000 /* for the body bits */ +#define RC6_6A_LCC_MASK 0xffff0000 /* RC6-6A-32 long customer code mask */ +#define RC6_6A_MCE_CC 0x800f0000 /* MCE customer code */ +#ifndef CHAR_BIT +#define CHAR_BIT 8 /* Normally in */ +#endif + +enum rc6_mode { + RC6_MODE_0, + RC6_MODE_6A, + RC6_MODE_UNKNOWN, +}; + +enum rc6_state { + STATE_INACTIVE, + STATE_PREFIX_SPACE, + STATE_HEADER_BIT_START, + STATE_HEADER_BIT_END, + STATE_TOGGLE_START, + STATE_TOGGLE_END, + STATE_BODY_BIT_START, + STATE_BODY_BIT_END, + STATE_FINISHED, +}; + +static enum rc6_mode rc6_mode(struct rc6_dec *data) +{ + switch (data->header & RC6_MODE_MASK) { + case 0: + return RC6_MODE_0; + case 6: + if (!data->toggle) + return RC6_MODE_6A; + /* fall through */ + default: + return RC6_MODE_UNKNOWN; + } +} + +/** + * ir_rc6_decode() - Decode one RC6 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_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev) +{ + struct rc6_dec *data = &dev->raw->rc6; + u32 scancode; + u8 toggle; + enum rc_type protocol; + + if (!(dev->enabled_protocols & + (RC_BIT_RC6_0 | RC_BIT_RC6_6A_20 | RC_BIT_RC6_6A_24 | + RC_BIT_RC6_6A_32 | RC_BIT_RC6_MCE))) + return 0; + + if (!is_timing_event(ev)) { + if (ev.reset) + data->state = STATE_INACTIVE; + return 0; + } + + if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2)) + goto out; + +again: + IR_dprintk(2, "RC6 decode started at state %i (%uus %s)\n", + data->state, TO_US(ev.duration), TO_STR(ev.pulse)); + + if (!geq_margin(ev.duration, RC6_UNIT, RC6_UNIT / 2)) + return 0; + + switch (data->state) { + + case STATE_INACTIVE: + if (!ev.pulse) + break; + + /* Note: larger margin on first pulse since each RC6_UNIT + is quite short and some hardware takes some time to + adjust to the signal */ + if (!eq_margin(ev.duration, RC6_PREFIX_PULSE, RC6_UNIT)) + break; + + data->state = STATE_PREFIX_SPACE; + data->count = 0; + return 0; + + case STATE_PREFIX_SPACE: + if (ev.pulse) + break; + + if (!eq_margin(ev.duration, RC6_PREFIX_SPACE, RC6_UNIT / 2)) + break; + + data->state = STATE_HEADER_BIT_START; + data->header = 0; + return 0; + + case STATE_HEADER_BIT_START: + if (!eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2)) + break; + + data->header <<= 1; + if (ev.pulse) + data->header |= 1; + data->count++; + data->state = STATE_HEADER_BIT_END; + return 0; + + case STATE_HEADER_BIT_END: + if (!is_transition(&ev, &dev->raw->prev_ev)) + break; + + if (data->count == RC6_HEADER_NBITS) + data->state = STATE_TOGGLE_START; + else + data->state = STATE_HEADER_BIT_START; + + decrease_duration(&ev, RC6_BIT_END); + goto again; + + case STATE_TOGGLE_START: + if (!eq_margin(ev.duration, RC6_TOGGLE_START, RC6_UNIT / 2)) + break; + + data->toggle = ev.pulse; + data->state = STATE_TOGGLE_END; + return 0; + + case STATE_TOGGLE_END: + if (!is_transition(&ev, &dev->raw->prev_ev) || + !geq_margin(ev.duration, RC6_TOGGLE_END, RC6_UNIT / 2)) + break; + + if (!(data->header & RC6_STARTBIT_MASK)) { + IR_dprintk(1, "RC6 invalid start bit\n"); + break; + } + + data->state = STATE_BODY_BIT_START; + decrease_duration(&ev, RC6_TOGGLE_END); + data->count = 0; + data->body = 0; + + switch (rc6_mode(data)) { + case RC6_MODE_0: + data->wanted_bits = RC6_0_NBITS; + break; + case RC6_MODE_6A: + data->wanted_bits = RC6_6A_NBITS; + break; + default: + IR_dprintk(1, "RC6 unknown mode\n"); + goto out; + } + goto again; + + case STATE_BODY_BIT_START: + if (eq_margin(ev.duration, RC6_BIT_START, RC6_UNIT / 2)) { + /* Discard LSB's that won't fit in data->body */ + if (data->count++ < CHAR_BIT * sizeof data->body) { + data->body <<= 1; + if (ev.pulse) + data->body |= 1; + } + data->state = STATE_BODY_BIT_END; + return 0; + } else if (RC6_MODE_6A == rc6_mode(data) && !ev.pulse && + geq_margin(ev.duration, RC6_SUFFIX_SPACE, RC6_UNIT / 2)) { + data->state = STATE_FINISHED; + goto again; + } + break; + + case STATE_BODY_BIT_END: + if (!is_transition(&ev, &dev->raw->prev_ev)) + break; + + if (data->count == data->wanted_bits) + data->state = STATE_FINISHED; + else + data->state = STATE_BODY_BIT_START; + + decrease_duration(&ev, RC6_BIT_END); + goto again; + + case STATE_FINISHED: + if (ev.pulse) + break; + + switch (rc6_mode(data)) { + case RC6_MODE_0: + scancode = data->body; + toggle = data->toggle; + protocol = RC_TYPE_RC6_0; + IR_dprintk(1, "RC6(0) scancode 0x%04x (toggle: %u)\n", + scancode, toggle); + break; + + case RC6_MODE_6A: + if (data->count > CHAR_BIT * sizeof data->body) { + IR_dprintk(1, "RC6 too many (%u) data bits\n", + data->count); + goto out; + } + + scancode = data->body; + switch (data->count) { + case 20: + protocol = RC_TYPE_RC6_6A_20; + toggle = 0; + break; + case 24: + protocol = RC_BIT_RC6_6A_24; + toggle = 0; + break; + case 32: + if ((scancode & RC6_6A_LCC_MASK) == RC6_6A_MCE_CC) { + protocol = RC_TYPE_RC6_MCE; + toggle = !!(scancode & RC6_6A_MCE_TOGGLE_MASK); + scancode &= ~RC6_6A_MCE_TOGGLE_MASK; + } else { + protocol = RC_BIT_RC6_6A_32; + toggle = 0; + } + break; + default: + IR_dprintk(1, "RC6(6A) unsupported length\n"); + goto out; + } + + IR_dprintk(1, "RC6(6A) proto 0x%04x, scancode 0x%08x (toggle: %u)\n", + protocol, scancode, toggle); + break; + default: + IR_dprintk(1, "RC6 unknown mode\n"); + goto out; + } + + rc_keydown(dev, protocol, scancode, toggle); + data->state = STATE_INACTIVE; + return 0; + } + +out: + IR_dprintk(1, "RC6 decode failed at state %i (%uus %s)\n", + data->state, TO_US(ev.duration), TO_STR(ev.pulse)); + data->state = STATE_INACTIVE; + return -EINVAL; +} + +static struct ir_raw_handler rc6_handler = { + .protocols = RC_BIT_RC6_0 | RC_BIT_RC6_6A_20 | + RC_BIT_RC6_6A_24 | RC_BIT_RC6_6A_32 | + RC_BIT_RC6_MCE, + .decode = ir_rc6_decode, +}; + +static int __init ir_rc6_decode_init(void) +{ + ir_raw_handler_register(&rc6_handler); + + printk(KERN_INFO "IR RC6 protocol handler initialized\n"); + return 0; +} + +static void __exit ir_rc6_decode_exit(void) +{ + ir_raw_handler_unregister(&rc6_handler); +} + +module_init(ir_rc6_decode_init); +module_exit(ir_rc6_decode_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("David Härdeman "); +MODULE_DESCRIPTION("RC6 IR protocol decoder"); -- cgit 1.2.3-korg