V4L/DVB (3197a): IR keymaps are exported by the ir-common module now

/*

 *

 * some common structs and functions to handle infrared remotes via

 * input layer ...

 *

 * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]

 *

 *  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; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  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.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/string.h>

#include <media/ir-common.h>

/* -------------------------------------------------------------------------- */

MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");

MODULE_LICENSE("GPL");

static int repeat = 1;

module_param(repeat, int, 0444);

MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)");

static int debug = 0;    /* debug level (0,1,2) */

module_param(debug, int, 0644);

#define dprintk(level, fmt, arg...)	if (debug >= level) \

	printk(KERN_DEBUG fmt , ## arg)

/* -------------------------------------------------------------------------- */

static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir)

{

	if (KEY_RESERVED == ir->keycode) {

		printk(KERN_INFO "%s: unknown key: key=0x%02x raw=0x%02x down=%d\n",

		       dev->name,ir->ir_key,ir->ir_raw,ir->keypressed);

		return;

	}

	dprintk(1,"%s: key event code=%d down=%d\n",

		dev->name,ir->keycode,ir->keypressed);

	input_report_key(dev,ir->keycode,ir->keypressed);

	input_sync(dev);

}

/* -------------------------------------------------------------------------- */

void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,

		   int ir_type, IR_KEYTAB_TYPE *ir_codes)

{

	int i;

	ir->ir_type = ir_type;

	if (ir_codes)

		memcpy(ir->ir_codes, ir_codes, sizeof(ir->ir_codes));

	dev->keycode     = ir->ir_codes;

	dev->keycodesize = sizeof(IR_KEYTAB_TYPE);

	dev->keycodemax  = IR_KEYTAB_SIZE;

	for (i = 0; i < IR_KEYTAB_SIZE; i++)

		set_bit(ir->ir_codes[i], dev->keybit);

	clear_bit(0, dev->keybit);

	set_bit(EV_KEY, dev->evbit);

	if (repeat)

		set_bit(EV_REP, dev->evbit);

}

void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)

{

	if (ir->keypressed) {

		ir->keypressed = 0;

		ir_input_key_event(dev,ir);

	}

}

void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,

		      u32 ir_key, u32 ir_raw)

{

	u32 keycode = IR_KEYCODE(ir->ir_codes, ir_key);

	if (ir->keypressed && ir->keycode != keycode) {

		ir->keypressed = 0;

		ir_input_key_event(dev,ir);

	}

	if (!ir->keypressed) {

		ir->ir_key  = ir_key;

		ir->ir_raw  = ir_raw;

		ir->keycode = keycode;

		ir->keypressed = 1;

		ir_input_key_event(dev,ir);

	}

}

/* -------------------------------------------------------------------------- */

u32 ir_extract_bits(u32 data, u32 mask)

{

	int mbit, vbit;

	u32 value;

	value = 0;

	vbit  = 0;

	for (mbit = 0; mbit < 32; mbit++) {

		if (!(mask & ((u32)1 << mbit)))

			continue;

		if (data & ((u32)1 << mbit))

			value |= (1 << vbit);

		vbit++;

	}

	return value;

}

static int inline getbit(u32 *samples, int bit)

{

	return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;

}

/* sump raw samples for visual debugging ;) */

int ir_dump_samples(u32 *samples, int count)

{

	int i, bit, start;

	printk(KERN_DEBUG "ir samples: ");

	start = 0;

	for (i = 0; i < count * 32; i++) {

		bit = getbit(samples,i);

		if (bit)

			start = 1;

		if (0 == start)

			continue;

		printk("%s", bit ? "#" : "_");

	}

	printk("\n");

	return 0;

}

/* decode raw samples, pulse distance coding used by NEC remotes */

int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)

{

	int i,last,bit,len;

	u32 curBit;

	u32 value;

	/* find start burst */

	for (i = len = 0; i < count * 32; i++) {

		bit = getbit(samples,i);

		if (bit) {

			len++;

		} else {

			if (len >= 29)

				break;

			len = 0;

		}

	}

	/* start burst to short */

	if (len < 29)

		return 0xffffffff;

	/* find start silence */

	for (len = 0; i < count * 32; i++) {

		bit = getbit(samples,i);

		if (bit) {

			break;

		} else {

			len++;

		}

	}

	/* silence to short */

	if (len < 7)

		return 0xffffffff;

	/* go decoding */

	len   = 0;

	last = 1;

	value = 0; curBit = 1;

	for (; i < count * 32; i++) {

		bit  = getbit(samples,i);

		if (last) {

			if(bit) {

				continue;

			} else {

				len = 1;

			}

		} else {

			if (bit) {

				if (len > (low + high) /2)

					value |= curBit;

				curBit <<= 1;

				if (curBit == 1)

					break;

			} else {

				len++;

			}

		}

		last = bit;

	}

	return value;

}

/* decode raw samples, biphase coding, used by rc5 for example */

int ir_decode_biphase(u32 *samples, int count, int low, int high)

{

	int i,last,bit,len,flips;

	u32 value;

	/* find start bit (1) */

	for (i = 0; i < 32; i++) {

		bit = getbit(samples,i);

		if (bit)

			break;

	}

	/* go decoding */

	len   = 0;

	flips = 0;

	value = 1;

	for (; i < count * 32; i++) {

		if (len > high)

			break;

		if (flips > 1)

			break;

		last = bit;

		bit  = getbit(samples,i);

		if (last == bit) {

			len++;

			continue;

		}

		if (len < low) {

			len++;

			flips++;

			continue;

		}

		value <<= 1;

		value |= bit;

		flips = 0;

		len   = 1;

	}

	return value;

}

EXPORT_SYMBOL_GPL(ir_input_init);

EXPORT_SYMBOL_GPL(ir_input_nokey);

EXPORT_SYMBOL_GPL(ir_input_keydown);

EXPORT_SYMBOL_GPL(ir_extract_bits);

EXPORT_SYMBOL_GPL(ir_dump_samples);

EXPORT_SYMBOL_GPL(ir_decode_biphase);

EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);

/*

 * Local variables:

 * c-basic-offset: 8

 * End:

 */