V4L/DVB (13612): IR: Move common IR code to drivers/media/IR

This is the first step of creating a common code for IR that can be
used by other input devices.

For now, keep IR dir at drivers/media, to easy the movement of the IR files,
but later patches may move it to drivers/IR or drivers/input/IR.

No functional changes is done on this patch.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 373 insertions, 0 deletions

diff --git a/drivers/media/IR/ir-functions.c b/drivers/media/IR/ir-functions.c
new file mode 100644
index 000000000000..e616f624ceaa
--- /dev/null
+++ b/drivers/media/IR/ir-functions.c
@@ -0,0 +1,373 @@
+/*
+ *
+ * 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/string.h>
+#include <linux/jiffies.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)");
+
+int media_ir_debug;    /* media_ir_debug level (0,1,2) */
+module_param_named(debug, media_ir_debug, int, 0644);
+
+/* -------------------------------------------------------------------------- */
+
+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 down=%d\n",
+		       dev->name, ir->ir_key, ir->keypressed);
+		return;
+	}
+	IR_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);
+}
+
+/* -------------------------------------------------------------------------- */
+
+int ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
+		   int ir_type, struct ir_scancode_table *ir_codes)
+{
+	ir->ir_type = ir_type;
+
+	ir->keytable.size = ir_roundup_tablesize(ir_codes->size);
+	ir->keytable.scan = kzalloc(ir->keytable.size *
+				    sizeof(struct ir_scancode), GFP_KERNEL);
+	if (!ir->keytable.scan)
+		return -ENOMEM;
+
+	IR_dprintk(1, "Allocated space for %d keycode entries (%zd bytes)\n",
+		ir->keytable.size,
+		ir->keytable.size * sizeof(ir->keytable.scan));
+
+	ir_copy_table(&ir->keytable, ir_codes);
+	ir_set_keycode_table(dev, &ir->keytable);
+
+	clear_bit(0, dev->keybit);
+	set_bit(EV_KEY, dev->evbit);
+	if (repeat)
+		set_bit(EV_REP, dev->evbit);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ir_input_init);
+
+
+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);
+	}
+}
+EXPORT_SYMBOL_GPL(ir_input_nokey);
+
+void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
+		      u32 ir_key)
+{
+	u32 keycode = ir_g_keycode_from_table(dev, 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->keycode = keycode;
+		ir->keypressed = 1;
+		ir_input_key_event(dev,ir);
+	}
+}
+EXPORT_SYMBOL_GPL(ir_input_keydown);
+
+/* -------------------------------------------------------------------------- */
+/* extract mask bits out of data and pack them into the result */
+u32 ir_extract_bits(u32 data, u32 mask)
+{
+	u32 vbit = 1, value = 0;
+
+	do {
+	    if (mask&1) {
+		if (data&1)
+			value |= vbit;
+		vbit<<=1;
+	    }
+	    data>>=1;
+	} while (mask>>=1);
+
+	return value;
+}
+EXPORT_SYMBOL_GPL(ir_extract_bits);
+
+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;
+}
+EXPORT_SYMBOL_GPL(ir_dump_samples);
+
+/* 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;
+}
+EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
+
+/* 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_decode_biphase);
+
+/* RC5 decoding stuff, moved from bttv-input.c to share it with
+ * saa7134 */
+
+/* decode raw bit pattern to RC5 code */
+u32 ir_rc5_decode(unsigned int code)
+{
+	unsigned int org_code = code;
+	unsigned int pair;
+	unsigned int rc5 = 0;
+	int i;
+
+	for (i = 0; i < 14; ++i) {
+		pair = code & 0x3;
+		code >>= 2;
+
+		rc5 <<= 1;
+		switch (pair) {
+		case 0:
+		case 2:
+			break;
+		case 1:
+			rc5 |= 1;
+			break;
+		case 3:
+			IR_dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);
+			return 0;
+		}
+	}
+	IR_dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
+		"instr=%x\n", rc5, org_code, RC5_START(rc5),
+		RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
+	return rc5;
+}
+EXPORT_SYMBOL_GPL(ir_rc5_decode);
+
+void ir_rc5_timer_end(unsigned long data)
+{
+	struct card_ir *ir = (struct card_ir *)data;
+	struct timeval tv;
+	unsigned long current_jiffies, timeout;
+	u32 gap;
+	u32 rc5 = 0;
+
+	/* get time */
+	current_jiffies = jiffies;
+	do_gettimeofday(&tv);
+
+	/* avoid overflow with gap >1s */
+	if (tv.tv_sec - ir->base_time.tv_sec > 1) {
+		gap = 200000;
+	} else {
+		gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
+		    tv.tv_usec - ir->base_time.tv_usec;
+	}
+
+	/* signal we're ready to start a new code */
+	ir->active = 0;
+
+	/* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
+	if (gap < 28000) {
+		IR_dprintk(1, "ir-common: spurious timer_end\n");
+		return;
+	}
+
+	if (ir->last_bit < 20) {
+		/* ignore spurious codes (caused by light/other remotes) */
+		IR_dprintk(1, "ir-common: short code: %x\n", ir->code);
+	} else {
+		ir->code = (ir->code << ir->shift_by) | 1;
+		rc5 = ir_rc5_decode(ir->code);
+
+		/* two start bits? */
+		if (RC5_START(rc5) != ir->start) {
+			IR_dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5));
+
+			/* right address? */
+		} else if (RC5_ADDR(rc5) == ir->addr) {
+			u32 toggle = RC5_TOGGLE(rc5);
+			u32 instr = RC5_INSTR(rc5);
+
+			/* Good code, decide if repeat/repress */
+			if (toggle != RC5_TOGGLE(ir->last_rc5) ||
+			    instr != RC5_INSTR(ir->last_rc5)) {
+				IR_dprintk(1, "ir-common: instruction %x, toggle %x\n", instr,
+					toggle);
+				ir_input_nokey(ir->dev, &ir->ir);
+				ir_input_keydown(ir->dev, &ir->ir, instr);
+			}
+
+			/* Set/reset key-up timer */
+			timeout = current_jiffies +
+				  msecs_to_jiffies(ir->rc5_key_timeout);
+			mod_timer(&ir->timer_keyup, timeout);
+
+			/* Save code for repeat test */
+			ir->last_rc5 = rc5;
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(ir_rc5_timer_end);
+
+void ir_rc5_timer_keyup(unsigned long data)
+{
+	struct card_ir *ir = (struct card_ir *)data;
+
+	IR_dprintk(1, "ir-common: key released\n");
+	ir_input_nokey(ir->dev, &ir->ir);
+}
+EXPORT_SYMBOL_GPL(ir_rc5_timer_keyup);