diff options
Diffstat (limited to 'drivers/media/IR/ir-nec-decoder.c')
| -rw-r--r-- | drivers/media/IR/ir-nec-decoder.c | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c deleted file mode 100644 index 70993f79c8a2..000000000000 --- a/drivers/media/IR/ir-nec-decoder.c +++ /dev/null @@ -1,217 +0,0 @@ -/* ir-nec-decoder.c - handle NEC IR Pulse/Space protocol - * - * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com> - * - * 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 <linux/bitrev.h> -#include "ir-core-priv.h" - -#define NEC_NBITS 32 -#define NEC_UNIT 562500 /* ns */ -#define NEC_HEADER_PULSE (16 * NEC_UNIT) -#define NECX_HEADER_PULSE (8 * NEC_UNIT) /* Less common NEC variant */ -#define NEC_HEADER_SPACE (8 * NEC_UNIT) -#define NEC_REPEAT_SPACE (4 * NEC_UNIT) -#define NEC_BIT_PULSE (1 * NEC_UNIT) -#define NEC_BIT_0_SPACE (1 * NEC_UNIT) -#define NEC_BIT_1_SPACE (3 * NEC_UNIT) -#define NEC_TRAILER_PULSE (1 * NEC_UNIT) -#define NEC_TRAILER_SPACE (10 * NEC_UNIT) /* even longer in reality */ -#define NECX_REPEAT_BITS 1 - -enum nec_state { - STATE_INACTIVE, - STATE_HEADER_SPACE, - STATE_BIT_PULSE, - STATE_BIT_SPACE, - STATE_TRAILER_PULSE, - STATE_TRAILER_SPACE, -}; - -/** - * ir_nec_decode() - Decode one NEC pulse or space - * @input_dev: the struct input_dev descriptor of the device - * @duration: the struct ir_raw_event descriptor of the pulse/space - * - * This function returns -EINVAL if the pulse violates the state machine - */ -static int ir_nec_decode(struct input_dev *input_dev, struct ir_raw_event ev) -{ - struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); - struct nec_dec *data = &ir_dev->raw->nec; - u32 scancode; - u8 address, not_address, command, not_command; - - if (!(ir_dev->raw->enabled_protocols & IR_TYPE_NEC)) - return 0; - - if (!is_timing_event(ev)) { - if (ev.reset) - data->state = STATE_INACTIVE; - return 0; - } - - IR_dprintk(2, "NEC decode started at state %d (%uus %s)\n", - data->state, TO_US(ev.duration), TO_STR(ev.pulse)); - - switch (data->state) { - - case STATE_INACTIVE: - if (!ev.pulse) - break; - - if (eq_margin(ev.duration, NEC_HEADER_PULSE, NEC_UNIT / 2)) { - data->is_nec_x = false; - data->necx_repeat = false; - } else if (eq_margin(ev.duration, NECX_HEADER_PULSE, NEC_UNIT / 2)) - data->is_nec_x = true; - else - break; - - data->count = 0; - data->state = STATE_HEADER_SPACE; - return 0; - - case STATE_HEADER_SPACE: - if (ev.pulse) - break; - - if (eq_margin(ev.duration, NEC_HEADER_SPACE, NEC_UNIT / 2)) { - data->state = STATE_BIT_PULSE; - return 0; - } else if (eq_margin(ev.duration, NEC_REPEAT_SPACE, NEC_UNIT / 2)) { - ir_repeat(input_dev); - IR_dprintk(1, "Repeat last key\n"); - data->state = STATE_TRAILER_PULSE; - return 0; - } - - break; - - case STATE_BIT_PULSE: - if (!ev.pulse) - break; - - if (!eq_margin(ev.duration, NEC_BIT_PULSE, NEC_UNIT / 2)) - break; - - data->state = STATE_BIT_SPACE; - return 0; - - case STATE_BIT_SPACE: - if (ev.pulse) - break; - - if (data->necx_repeat && data->count == NECX_REPEAT_BITS && - geq_margin(ev.duration, - NEC_TRAILER_SPACE, NEC_UNIT / 2)) { - IR_dprintk(1, "Repeat last key\n"); - ir_repeat(input_dev); - data->state = STATE_INACTIVE; - return 0; - - } else if (data->count > NECX_REPEAT_BITS) - data->necx_repeat = false; - - data->bits <<= 1; - if (eq_margin(ev.duration, NEC_BIT_1_SPACE, NEC_UNIT / 2)) - data->bits |= 1; - else if (!eq_margin(ev.duration, NEC_BIT_0_SPACE, NEC_UNIT / 2)) - break; - data->count++; - - if (data->count == NEC_NBITS) - 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, NEC_TRAILER_PULSE, NEC_UNIT / 2)) - break; - - data->state = STATE_TRAILER_SPACE; - return 0; - - case STATE_TRAILER_SPACE: - if (ev.pulse) - break; - - if (!geq_margin(ev.duration, NEC_TRAILER_SPACE, NEC_UNIT / 2)) - break; - - address = bitrev8((data->bits >> 24) & 0xff); - not_address = bitrev8((data->bits >> 16) & 0xff); - command = bitrev8((data->bits >> 8) & 0xff); - not_command = bitrev8((data->bits >> 0) & 0xff); - - if ((command ^ not_command) != 0xff) { - IR_dprintk(1, "NEC checksum error: received 0x%08x\n", - data->bits); - break; - } - - if ((address ^ not_address) != 0xff) { - /* Extended NEC */ - scancode = address << 16 | - not_address << 8 | - command; - IR_dprintk(1, "NEC (Ext) scancode 0x%06x\n", scancode); - } else { - /* Normal NEC */ - scancode = address << 8 | command; - IR_dprintk(1, "NEC scancode 0x%04x\n", scancode); - } - - if (data->is_nec_x) - data->necx_repeat = true; - - ir_keydown(input_dev, scancode, 0); - data->state = STATE_INACTIVE; - return 0; - } - - IR_dprintk(1, "NEC decode failed at state %d (%uus %s)\n", - data->state, TO_US(ev.duration), TO_STR(ev.pulse)); - data->state = STATE_INACTIVE; - return -EINVAL; -} - -static struct ir_raw_handler nec_handler = { - .protocols = IR_TYPE_NEC, - .decode = ir_nec_decode, -}; - -static int __init ir_nec_decode_init(void) -{ - ir_raw_handler_register(&nec_handler); - - printk(KERN_INFO "IR NEC protocol handler initialized\n"); - return 0; -} - -static void __exit ir_nec_decode_exit(void) -{ - ir_raw_handler_unregister(&nec_handler); -} - -module_init(ir_nec_decode_init); -module_exit(ir_nec_decode_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>"); -MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); -MODULE_DESCRIPTION("NEC IR protocol decoder"); |