From 733419b5c4d29186006982a9a27227e214a39dbc Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?David=20H=C3=A4rdeman?= Date: Thu, 8 Apr 2010 20:04:30 -0300 Subject: [PATCH] V4L/DVB: Add RC5x support to ir-core MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds RC5x support to drivers/media/IR/ir-rc5-decoder.c Signed-off-by: David Härdeman Signed-off-by: Mauro Carvalho Chehab --- drivers/media/IR/ir-rc5-decoder.c | 78 +++++++++++++++++++++++-------- 1 file changed, 59 insertions(+), 19 deletions(-) diff --git a/drivers/media/IR/ir-rc5-decoder.c b/drivers/media/IR/ir-rc5-decoder.c index d8f0760890fa..dd5a4d5f25fd 100644 --- a/drivers/media/IR/ir-rc5-decoder.c +++ b/drivers/media/IR/ir-rc5-decoder.c @@ -1,4 +1,4 @@ -/* ir-rc5-decoder.c - handle RC-5 IR Pulse/Space protocol +/* ir-rc5-decoder.c - handle RC5(x) IR Pulse/Space protocol * * Copyright (C) 2010 by Mauro Carvalho Chehab * @@ -13,15 +13,19 @@ */ /* - * This code only handles 14 bits RC-5 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 bits, where + * 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 RC5X_SPACE SPACE(4) #define RC5_UNIT 888888 /* ns */ /* Used to register rc5_decoder clients */ @@ -32,6 +36,7 @@ enum rc5_state { STATE_INACTIVE, STATE_BIT_START, STATE_BIT_END, + STATE_CHECK_RC5X, STATE_FINISHED, }; @@ -45,6 +50,7 @@ struct decoder_data { u32 rc5_bits; int last_unit; unsigned count; + unsigned wanted_bits; }; @@ -126,7 +132,7 @@ static int ir_rc5_decode(struct input_dev *input_dev, s64 duration) { struct decoder_data *data; struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); - u8 command, system, toggle; + u8 toggle; u32 scancode; int u; @@ -147,7 +153,7 @@ static int ir_rc5_decode(struct input_dev *input_dev, s64 duration) goto out; again: - IR_dprintk(2, "RC5 decode started at state %i (%i units, %ius)\n", + IR_dprintk(2, "RC5(x) decode started at state %i (%i units, %ius)\n", data->state, u, TO_US(duration)); if (DURATION(u) == 0 && data->state != STATE_FINISHED) @@ -159,6 +165,8 @@ again: if (IS_PULSE(u)) { 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(u, 1); goto again; } @@ -176,7 +184,7 @@ again: * If the last bit is zero, a space will merge * with the silence after the command. */ - if (IS_PULSE(u) && data->count == RC5_NBITS) { + if (IS_PULSE(u) && data->count == data->wanted_bits) { data->state = STATE_FINISHED; goto again; } @@ -188,8 +196,10 @@ again: case STATE_BIT_END: if (IS_TRANSITION(u, data->last_unit)) { - if (data->count == RC5_NBITS) + 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; @@ -198,22 +208,52 @@ again: } break; - case STATE_FINISHED: - command = (data->rc5_bits & 0x0003F) >> 0; - system = (data->rc5_bits & 0x007C0) >> 6; - toggle = (data->rc5_bits & 0x00800) ? 1 : 0; - command += (data->rc5_bits & 0x01000) ? 0 : 0x40; - scancode = system << 8 | command; + case STATE_CHECK_RC5X: + if (IS_SPACE(u) && DURATION(u) >= DURATION(RC5X_SPACE)) { + /* RC5X */ + data->wanted_bits = RC5X_NBITS; + DECREASE_DURATION(u, DURATION(RC5X_SPACE)); + } else { + /* RC5 */ + data->wanted_bits = RC5_NBITS; + } + data->state = STATE_BIT_START; + goto again; + + case STATE_FINISHED: + if (data->wanted_bits == RC5X_NBITS) { + /* RC5X */ + u8 xdata, command, system; + xdata = (data->rc5_bits & 0x0003F) >> 0; + command = (data->rc5_bits & 0x00FC0) >> 6; + system = (data->rc5_bits & 0x1F000) >> 12; + toggle = (data->rc5_bits & 0x20000) ? 1 : 0; + command += (data->rc5_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->rc5_bits & 0x0003F) >> 0; + system = (data->rc5_bits & 0x007C0) >> 6; + toggle = (data->rc5_bits & 0x00800) ? 1 : 0; + command += (data->rc5_bits & 0x01000) ? 0 : 0x40; + scancode = system << 8 | command; + + IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n", + scancode, toggle); + } - 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 decode failed at state %i (%i units, %ius)\n", + IR_dprintk(1, "RC5(x) decode failed at state %i (%i units, %ius)\n", data->state, u, TO_US(duration)); data->state = STATE_INACTIVE; return -EINVAL; @@ -273,7 +313,7 @@ static int __init ir_rc5_decode_init(void) { ir_raw_handler_register(&rc5_handler); - printk(KERN_INFO "IR RC-5 protocol handler initialized\n"); + printk(KERN_INFO "IR RC5(x) protocol handler initialized\n"); return 0; } @@ -288,4 +328,4 @@ module_exit(ir_rc5_decode_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Mauro Carvalho Chehab "); MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); -MODULE_DESCRIPTION("RC-5 IR protocol decoder"); +MODULE_DESCRIPTION("RC5(x) IR protocol decoder");