diff options
Diffstat (limited to 'drivers/media/IR/ir-rc5-decoder.c')
| -rw-r--r-- | drivers/media/IR/ir-rc5-decoder.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/drivers/media/IR/ir-rc5-decoder.c b/drivers/media/IR/ir-rc5-decoder.c deleted file mode 100644 index 572ed4ca8c68..000000000000 --- a/drivers/media/IR/ir-rc5-decoder.c +++ /dev/null @@ -1,190 +0,0 @@ -/* ir-rc5-decoder.c - handle RC5(x) 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. - */ - -/* - * This code handles 14 bits RC5 protocols and 20 bits RC5x protocols. - * There are other variants that use a different number of bits. - * This is currently unsupported. - * It considers a carrier of 36 kHz, with a total of 14/20 bits, where - * the first two bits are start bits, and a third one is a filing bit - */ - -#include "ir-core-priv.h" - -#define RC5_NBITS 14 -#define RC5X_NBITS 20 -#define CHECK_RC5X_NBITS 8 -#define RC5_UNIT 888888 /* ns */ -#define RC5_BIT_START (1 * RC5_UNIT) -#define RC5_BIT_END (1 * RC5_UNIT) -#define RC5X_SPACE (4 * RC5_UNIT) - -enum rc5_state { - STATE_INACTIVE, - STATE_BIT_START, - STATE_BIT_END, - STATE_CHECK_RC5X, - STATE_FINISHED, -}; - -/** - * ir_rc5_decode() - Decode one RC-5 pulse or space - * @input_dev: the struct input_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_rc5_decode(struct input_dev *input_dev, struct ir_raw_event ev) -{ - struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); - struct rc5_dec *data = &ir_dev->raw->rc5; - u8 toggle; - u32 scancode; - - if (!(ir_dev->raw->enabled_protocols & IR_TYPE_RC5)) - return 0; - - if (!is_timing_event(ev)) { - if (ev.reset) - data->state = STATE_INACTIVE; - return 0; - } - - if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2)) - goto out; - -again: - IR_dprintk(2, "RC5(x) decode started at state %i (%uus %s)\n", - data->state, TO_US(ev.duration), TO_STR(ev.pulse)); - - if (!geq_margin(ev.duration, RC5_UNIT, RC5_UNIT / 2)) - return 0; - - switch (data->state) { - - case STATE_INACTIVE: - if (!ev.pulse) - break; - - data->state = STATE_BIT_START; - data->count = 1; - /* We just need enough bits to get to STATE_CHECK_RC5X */ - data->wanted_bits = RC5X_NBITS; - decrease_duration(&ev, RC5_BIT_START); - goto again; - - case STATE_BIT_START: - if (!eq_margin(ev.duration, RC5_BIT_START, RC5_UNIT / 2)) - break; - - data->bits <<= 1; - if (!ev.pulse) - data->bits |= 1; - data->count++; - data->state = STATE_BIT_END; - return 0; - - case STATE_BIT_END: - if (!is_transition(&ev, &ir_dev->raw->prev_ev)) - break; - - if (data->count == data->wanted_bits) - data->state = STATE_FINISHED; - else if (data->count == CHECK_RC5X_NBITS) - data->state = STATE_CHECK_RC5X; - else - data->state = STATE_BIT_START; - - decrease_duration(&ev, RC5_BIT_END); - goto again; - - case STATE_CHECK_RC5X: - if (!ev.pulse && geq_margin(ev.duration, RC5X_SPACE, RC5_UNIT / 2)) { - /* RC5X */ - data->wanted_bits = RC5X_NBITS; - decrease_duration(&ev, RC5X_SPACE); - } else { - /* RC5 */ - data->wanted_bits = RC5_NBITS; - } - data->state = STATE_BIT_START; - goto again; - - case STATE_FINISHED: - if (ev.pulse) - break; - - if (data->wanted_bits == RC5X_NBITS) { - /* RC5X */ - u8 xdata, command, system; - xdata = (data->bits & 0x0003F) >> 0; - command = (data->bits & 0x00FC0) >> 6; - system = (data->bits & 0x1F000) >> 12; - toggle = (data->bits & 0x20000) ? 1 : 0; - command += (data->bits & 0x01000) ? 0 : 0x40; - scancode = system << 16 | command << 8 | xdata; - - IR_dprintk(1, "RC5X scancode 0x%06x (toggle: %u)\n", - scancode, toggle); - - } else { - /* RC5 */ - u8 command, system; - command = (data->bits & 0x0003F) >> 0; - system = (data->bits & 0x007C0) >> 6; - toggle = (data->bits & 0x00800) ? 1 : 0; - command += (data->bits & 0x01000) ? 0 : 0x40; - scancode = system << 8 | command; - - IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n", - scancode, toggle); - } - - ir_keydown(input_dev, scancode, toggle); - data->state = STATE_INACTIVE; - return 0; - } - -out: - IR_dprintk(1, "RC5(x) 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 rc5_handler = { - .protocols = IR_TYPE_RC5, - .decode = ir_rc5_decode, -}; - -static int __init ir_rc5_decode_init(void) -{ - ir_raw_handler_register(&rc5_handler); - - printk(KERN_INFO "IR RC5(x) protocol handler initialized\n"); - return 0; -} - -static void __exit ir_rc5_decode_exit(void) -{ - ir_raw_handler_unregister(&rc5_handler); -} - -module_init(ir_rc5_decode_init); -module_exit(ir_rc5_decode_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>"); -MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); -MODULE_DESCRIPTION("RC5(x) IR protocol decoder"); |