diff options
Diffstat (limited to 'drivers/media/IR/ir-jvc-decoder.c')
| -rw-r--r-- | drivers/media/IR/ir-jvc-decoder.c | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/drivers/media/IR/ir-jvc-decoder.c b/drivers/media/IR/ir-jvc-decoder.c deleted file mode 100644 index 63dca6e5458b..000000000000 --- a/drivers/media/IR/ir-jvc-decoder.c +++ /dev/null @@ -1,199 +0,0 @@ -/* ir-jvc-decoder.c - handle JVC IR Pulse/Space protocol - * - * Copyright (C) 2010 by David Härdeman <david@hardeman.nu> - * - * 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 JVC_NBITS 16 /* dev(8) + func(8) */ -#define JVC_UNIT 525000 /* ns */ -#define JVC_HEADER_PULSE (16 * JVC_UNIT) /* lack of header -> repeat */ -#define JVC_HEADER_SPACE (8 * JVC_UNIT) -#define JVC_BIT_PULSE (1 * JVC_UNIT) -#define JVC_BIT_0_SPACE (1 * JVC_UNIT) -#define JVC_BIT_1_SPACE (3 * JVC_UNIT) -#define JVC_TRAILER_PULSE (1 * JVC_UNIT) -#define JVC_TRAILER_SPACE (35 * JVC_UNIT) - -enum jvc_state { - STATE_INACTIVE, - STATE_HEADER_SPACE, - STATE_BIT_PULSE, - STATE_BIT_SPACE, - STATE_TRAILER_PULSE, - STATE_TRAILER_SPACE, - STATE_CHECK_REPEAT, -}; - -/** - * ir_jvc_decode() - Decode one JVC 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_jvc_decode(struct input_dev *input_dev, struct ir_raw_event ev) -{ - struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); - struct jvc_dec *data = &ir_dev->raw->jvc; - - if (!(ir_dev->raw->enabled_protocols & IR_TYPE_JVC)) - return 0; - - if (!is_timing_event(ev)) { - if (ev.reset) - data->state = STATE_INACTIVE; - return 0; - } - - if (!geq_margin(ev.duration, JVC_UNIT, JVC_UNIT / 2)) - goto out; - - IR_dprintk(2, "JVC decode started at state %d (%uus %s)\n", - data->state, TO_US(ev.duration), TO_STR(ev.pulse)); - -again: - switch (data->state) { - - case STATE_INACTIVE: - if (!ev.pulse) - break; - - if (!eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) - break; - - data->count = 0; - data->first = true; - data->toggle = !data->toggle; - data->state = STATE_HEADER_SPACE; - return 0; - - case STATE_HEADER_SPACE: - if (ev.pulse) - break; - - if (!eq_margin(ev.duration, JVC_HEADER_SPACE, JVC_UNIT / 2)) - break; - - data->state = STATE_BIT_PULSE; - return 0; - - case STATE_BIT_PULSE: - if (!ev.pulse) - break; - - if (!eq_margin(ev.duration, JVC_BIT_PULSE, JVC_UNIT / 2)) - break; - - data->state = STATE_BIT_SPACE; - return 0; - - case STATE_BIT_SPACE: - if (ev.pulse) - break; - - data->bits <<= 1; - if (eq_margin(ev.duration, JVC_BIT_1_SPACE, JVC_UNIT / 2)) { - data->bits |= 1; - decrease_duration(&ev, JVC_BIT_1_SPACE); - } else if (eq_margin(ev.duration, JVC_BIT_0_SPACE, JVC_UNIT / 2)) - decrease_duration(&ev, JVC_BIT_0_SPACE); - else - break; - data->count++; - - if (data->count == JVC_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, JVC_TRAILER_PULSE, JVC_UNIT / 2)) - break; - - data->state = STATE_TRAILER_SPACE; - return 0; - - case STATE_TRAILER_SPACE: - if (ev.pulse) - break; - - if (!geq_margin(ev.duration, JVC_TRAILER_SPACE, JVC_UNIT / 2)) - break; - - if (data->first) { - u32 scancode; - scancode = (bitrev8((data->bits >> 8) & 0xff) << 8) | - (bitrev8((data->bits >> 0) & 0xff) << 0); - IR_dprintk(1, "JVC scancode 0x%04x\n", scancode); - ir_keydown(input_dev, scancode, data->toggle); - data->first = false; - data->old_bits = data->bits; - } else if (data->bits == data->old_bits) { - IR_dprintk(1, "JVC repeat\n"); - ir_repeat(input_dev); - } else { - IR_dprintk(1, "JVC invalid repeat msg\n"); - break; - } - - data->count = 0; - data->state = STATE_CHECK_REPEAT; - return 0; - - case STATE_CHECK_REPEAT: - if (!ev.pulse) - break; - - if (eq_margin(ev.duration, JVC_HEADER_PULSE, JVC_UNIT / 2)) - data->state = STATE_INACTIVE; - else - data->state = STATE_BIT_PULSE; - goto again; - } - -out: - IR_dprintk(1, "JVC 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 jvc_handler = { - .protocols = IR_TYPE_JVC, - .decode = ir_jvc_decode, -}; - -static int __init ir_jvc_decode_init(void) -{ - ir_raw_handler_register(&jvc_handler); - - printk(KERN_INFO "IR JVC protocol handler initialized\n"); - return 0; -} - -static void __exit ir_jvc_decode_exit(void) -{ - ir_raw_handler_unregister(&jvc_handler); -} - -module_init(ir_jvc_decode_init); -module_exit(ir_jvc_decode_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("David Härdeman <david@hardeman.nu>"); -MODULE_DESCRIPTION("JVC IR protocol decoder"); |