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V4L/DVB: Add RC5x support to ir-core
This patch adds RC5x support to drivers/media/IR/ir-rc5-decoder.c Signed-off-by: David Härdeman <david@hardeman.nu> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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parent
450df22286
commit
733419b5c4
@ -1,4 +1,4 @@
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/* ir-rc5-decoder.c - handle RC-5 IR Pulse/Space protocol
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/* ir-rc5-decoder.c - handle RC5(x) IR Pulse/Space protocol
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*
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* Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
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*
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@ -13,15 +13,19 @@
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*/
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/*
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* This code only handles 14 bits RC-5 protocols. There are other variants
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* that use a different number of bits. This is currently unsupported
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* It considers a carrier of 36 kHz, with a total of 14 bits, where
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* This code handles 14 bits RC5 protocols and 20 bits RC5x protocols.
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* There are other variants that use a different number of bits.
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* This is currently unsupported.
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* It considers a carrier of 36 kHz, with a total of 14/20 bits, where
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* the first two bits are start bits, and a third one is a filing bit
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*/
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#include "ir-core-priv.h"
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#define RC5_NBITS 14
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#define RC5X_NBITS 20
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#define CHECK_RC5X_NBITS 8
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#define RC5X_SPACE SPACE(4)
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#define RC5_UNIT 888888 /* ns */
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/* Used to register rc5_decoder clients */
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@ -32,6 +36,7 @@ enum rc5_state {
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STATE_INACTIVE,
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STATE_BIT_START,
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STATE_BIT_END,
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STATE_CHECK_RC5X,
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STATE_FINISHED,
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};
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@ -45,6 +50,7 @@ struct decoder_data {
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u32 rc5_bits;
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int last_unit;
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unsigned count;
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unsigned wanted_bits;
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};
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@ -126,7 +132,7 @@ static int ir_rc5_decode(struct input_dev *input_dev, s64 duration)
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{
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struct decoder_data *data;
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struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
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u8 command, system, toggle;
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u8 toggle;
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u32 scancode;
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int u;
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@ -147,7 +153,7 @@ static int ir_rc5_decode(struct input_dev *input_dev, s64 duration)
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goto out;
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again:
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IR_dprintk(2, "RC5 decode started at state %i (%i units, %ius)\n",
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IR_dprintk(2, "RC5(x) decode started at state %i (%i units, %ius)\n",
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data->state, u, TO_US(duration));
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if (DURATION(u) == 0 && data->state != STATE_FINISHED)
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@ -159,6 +165,8 @@ again:
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if (IS_PULSE(u)) {
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data->state = STATE_BIT_START;
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data->count = 1;
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/* We just need enough bits to get to STATE_CHECK_RC5X */
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data->wanted_bits = RC5X_NBITS;
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DECREASE_DURATION(u, 1);
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goto again;
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}
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@ -176,7 +184,7 @@ again:
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* If the last bit is zero, a space will merge
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* with the silence after the command.
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*/
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if (IS_PULSE(u) && data->count == RC5_NBITS) {
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if (IS_PULSE(u) && data->count == data->wanted_bits) {
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data->state = STATE_FINISHED;
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goto again;
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}
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@ -188,8 +196,10 @@ again:
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case STATE_BIT_END:
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if (IS_TRANSITION(u, data->last_unit)) {
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if (data->count == RC5_NBITS)
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if (data->count == data->wanted_bits)
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data->state = STATE_FINISHED;
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else if (data->count == CHECK_RC5X_NBITS)
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data->state = STATE_CHECK_RC5X;
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else
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data->state = STATE_BIT_START;
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@ -198,22 +208,52 @@ again:
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}
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break;
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case STATE_FINISHED:
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command = (data->rc5_bits & 0x0003F) >> 0;
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system = (data->rc5_bits & 0x007C0) >> 6;
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toggle = (data->rc5_bits & 0x00800) ? 1 : 0;
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command += (data->rc5_bits & 0x01000) ? 0 : 0x40;
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scancode = system << 8 | command;
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case STATE_CHECK_RC5X:
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if (IS_SPACE(u) && DURATION(u) >= DURATION(RC5X_SPACE)) {
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/* RC5X */
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data->wanted_bits = RC5X_NBITS;
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DECREASE_DURATION(u, DURATION(RC5X_SPACE));
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} else {
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/* RC5 */
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data->wanted_bits = RC5_NBITS;
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}
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data->state = STATE_BIT_START;
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goto again;
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case STATE_FINISHED:
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if (data->wanted_bits == RC5X_NBITS) {
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/* RC5X */
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u8 xdata, command, system;
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xdata = (data->rc5_bits & 0x0003F) >> 0;
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command = (data->rc5_bits & 0x00FC0) >> 6;
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system = (data->rc5_bits & 0x1F000) >> 12;
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toggle = (data->rc5_bits & 0x20000) ? 1 : 0;
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command += (data->rc5_bits & 0x01000) ? 0 : 0x40;
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scancode = system << 16 | command << 8 | xdata;
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IR_dprintk(1, "RC5X scancode 0x%06x (toggle: %u)\n",
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scancode, toggle);
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} else {
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/* RC5 */
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u8 command, system;
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command = (data->rc5_bits & 0x0003F) >> 0;
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system = (data->rc5_bits & 0x007C0) >> 6;
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toggle = (data->rc5_bits & 0x00800) ? 1 : 0;
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command += (data->rc5_bits & 0x01000) ? 0 : 0x40;
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scancode = system << 8 | command;
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IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n",
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scancode, toggle);
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}
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IR_dprintk(1, "RC5 scancode 0x%04x (toggle: %u)\n",
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scancode, toggle);
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ir_keydown(input_dev, scancode, toggle);
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data->state = STATE_INACTIVE;
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return 0;
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}
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out:
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IR_dprintk(1, "RC5 decode failed at state %i (%i units, %ius)\n",
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IR_dprintk(1, "RC5(x) decode failed at state %i (%i units, %ius)\n",
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data->state, u, TO_US(duration));
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data->state = STATE_INACTIVE;
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return -EINVAL;
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@ -273,7 +313,7 @@ static int __init ir_rc5_decode_init(void)
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{
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ir_raw_handler_register(&rc5_handler);
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printk(KERN_INFO "IR RC-5 protocol handler initialized\n");
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printk(KERN_INFO "IR RC5(x) protocol handler initialized\n");
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return 0;
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}
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@ -288,4 +328,4 @@ module_exit(ir_rc5_decode_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
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MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
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MODULE_DESCRIPTION("RC-5 IR protocol decoder");
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MODULE_DESCRIPTION("RC5(x) IR protocol decoder");
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