diff options
Diffstat (limited to 'drivers/media/rc/ir-rc5-sz-decoder.c')
| -rw-r--r-- | drivers/media/rc/ir-rc5-sz-decoder.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/drivers/media/rc/ir-rc5-sz-decoder.c b/drivers/media/rc/ir-rc5-sz-decoder.c deleted file mode 100644 index 771e9fcbd770..000000000000 --- a/drivers/media/rc/ir-rc5-sz-decoder.c +++ /dev/null @@ -1,154 +0,0 @@ -/* ir-rc5-sz-decoder.c - handle RC5 Streamzap IR Pulse/Space protocol - * - * Copyright (C) 2010 by Mauro Carvalho Chehab - * Copyright (C) 2010 by Jarod Wilson <jarod@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 the 15 bit RC5-ish protocol used by the Streamzap - * PC Remote. - * It considers a carrier of 36 kHz, with a total of 15 bits, where - * the first two bits are start bits, and a third one is a filing bit - */ - -#include "rc-core-priv.h" -#include <linux/module.h> - -#define RC5_SZ_NBITS 15 -#define RC5_UNIT 888888 /* ns */ -#define RC5_BIT_START (1 * RC5_UNIT) -#define RC5_BIT_END (1 * RC5_UNIT) - -enum rc5_sz_state { - STATE_INACTIVE, - STATE_BIT_START, - STATE_BIT_END, - STATE_FINISHED, -}; - -/** - * ir_rc5_sz_decode() - Decode one RC-5 Streamzap 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_rc5_sz_decode(struct rc_dev *dev, struct ir_raw_event ev) -{ - struct rc5_sz_dec *data = &dev->raw->rc5_sz; - u8 toggle, command, system; - u32 scancode; - - if (!(dev->enabled_protocols & RC_BIT_RC5_SZ)) - 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-sz 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; - data->wanted_bits = RC5_SZ_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, &dev->raw->prev_ev)) - break; - - if (data->count == data->wanted_bits) - data->state = STATE_FINISHED; - else - data->state = STATE_BIT_START; - - decrease_duration(&ev, RC5_BIT_END); - goto again; - - case STATE_FINISHED: - if (ev.pulse) - break; - - /* RC5-sz */ - command = (data->bits & 0x0003F) >> 0; - system = (data->bits & 0x02FC0) >> 6; - toggle = (data->bits & 0x01000) ? 1 : 0; - scancode = system << 6 | command; - - IR_dprintk(1, "RC5-sz scancode 0x%04x (toggle: %u)\n", - scancode, toggle); - - rc_keydown(dev, RC_TYPE_RC5_SZ, scancode, toggle); - data->state = STATE_INACTIVE; - return 0; - } - -out: - IR_dprintk(1, "RC5-sz 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_sz_handler = { - .protocols = RC_BIT_RC5_SZ, - .decode = ir_rc5_sz_decode, -}; - -static int __init ir_rc5_sz_decode_init(void) -{ - ir_raw_handler_register(&rc5_sz_handler); - - printk(KERN_INFO "IR RC5 (streamzap) protocol handler initialized\n"); - return 0; -} - -static void __exit ir_rc5_sz_decode_exit(void) -{ - ir_raw_handler_unregister(&rc5_sz_handler); -} - -module_init(ir_rc5_sz_decode_init); -module_exit(ir_rc5_sz_decode_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>"); -MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); -MODULE_DESCRIPTION("RC5 (streamzap) IR protocol decoder"); |