1 files changed, 134 insertions, 0 deletions
diff --git a/drivers/media/video/gspca/pac_common.h b/drivers/media/video/gspca/pac_common.h
new file mode 100644
index 00000000000..8462a7c1a33
--- /dev/null
+++ b/drivers/media/video/gspca/pac_common.h
@@ -0,0 +1,134 @@
+/*
+ * Pixart PAC207BCA / PAC73xx common functions
+ *
+ * Copyright (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
+ * Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
+ * Copyleft (C) 2005 Michel Xhaard mxhaard@magic.fr
+ *
+ * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
+ *
+ * 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
+ *
+ */
+/* We calculate the autogain at the end of the transfer of a frame, at this
+   moment a frame with the old settings is being captured and transmitted. So
+   if we adjust the gain or exposure we must ignore atleast the next frame for
+   the new settings to come into effect before doing any other adjustments. */
+#define PAC_AUTOGAIN_IGNORE_FRAMES      2
+static const unsigned char pac_sof_marker[5] =
+                { 0xff, 0xff, 0x00, 0xff, 0x96 };
+/*
+   The following state machine finds the SOF marker sequence
+   0xff, 0xff, 0x00, 0xff, 0x96 in a byte stream.
+           +----------+
+           | 0: START |<---------------\
+           +----------+<-\             |
+             |       \---/otherwise    |
+             v 0xff                    |
+           +----------+ otherwise      |
+           |     1    |--------------->*
+           |          |                ^
+           +----------+                |
+             |                         |
+             v 0xff                    |
+           +----------+<-\0xff         |
+        /->|          |--/             |
+        |  |     2    |--------------->*
+        |  |          | otherwise      ^
+        |  +----------+                |
+        |    |                         |
+        |    v 0x00                    |
+        |  +----------+                |
+        |  |     3    |                |
+        |  |          |--------------->*
+        |  +----------+ otherwise      ^
+        |    |                         |
+   0xff |    v 0xff                    |
+        |  +----------+                |
+        \--|     4    |                |
+           |          |----------------/
+           +----------+ otherwise
+             |
+             v 0x96
+           +----------+
+           |  FOUND   |
+           +----------+
+*/
+static unsigned char *pac_find_sof(u8 *sof_read,
+                                        unsigned char *m, int len)
+{
+        int i;
+        /* Search for the SOF marker (fixed part) in the header */
+        for (i = 0; i < len; i++) {
+                switch (*sof_read) {
+                case 0:
+                        if (m[i] == 0xff)
+                                *sof_read = 1;
+                        break;
+                case 1:
+                        if (m[i] == 0xff)
+                                *sof_read = 2;
+                        else
+                                *sof_read = 0;
+                        break;
+                case 2:
+                        switch (m[i]) {
+                        case 0x00:
+                                *sof_read = 3;
+                                break;
+                        case 0xff:
+                                /* stay in this state */
+                                break;
+                        default:
+                                *sof_read = 0;
+                        }
+                        break;
+                case 3:
+                        if (m[i] == 0xff)
+                                *sof_read = 4;
+                        else
+                                *sof_read = 0;
+                        break;
+                case 4:
+                        switch (m[i]) {
+                        case 0x96:
+                                /* Pattern found */
+                                PDEBUG(D_FRAM,
+                                        "SOF found, bytes to analyze: %u."
+                                        " Frame starts at byte #%u",
+                                        len, i + 1);
+                                *sof_read = 0;
+                                return m + i + 1;
+                                break;
+                        case 0xff:
+                                *sof_read = 2;
+                                break;
+                        default:
+                                *sof_read = 0;
+                        }
+                        break;
+                default:
+                        *sof_read = 0;
+                }
+        }
+        return NULL;
+}

diff --git a/drivers/media/video/gspca/pac_common.h b/drivers/media/video/gspca/pac_common.h new file mode 100644 index 00000000000..8462a7c1a33 --- /dev/null +++ b/drivers/media/video/gspca/pac_common.h
@@ -0,0 +1,134 @@
	1	/*
	2	* Pixart PAC207BCA / PAC73xx common functions
	3	*
	4	* Copyright (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
	5	* Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
	6	* Copyleft (C) 2005 Michel Xhaard mxhaard@magic.fr
	7	*
	8	* V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*
	24	*/
	25
	26	/* We calculate the autogain at the end of the transfer of a frame, at this
	27	moment a frame with the old settings is being captured and transmitted. So
	28	if we adjust the gain or exposure we must ignore atleast the next frame for
	29	the new settings to come into effect before doing any other adjustments. */
	30	#define PAC_AUTOGAIN_IGNORE_FRAMES 2
	31
	32	static const unsigned char pac_sof_marker[5] =
	33	{ 0xff, 0xff, 0x00, 0xff, 0x96 };
	34
	35	/*
	36	The following state machine finds the SOF marker sequence
	37	0xff, 0xff, 0x00, 0xff, 0x96 in a byte stream.
	38
	39	+----------+
	40	\| 0: START \|<---------------\
	41	+----------+<-\ \|
	42	\| \---/otherwise \|
	43	v 0xff \|
	44	+----------+ otherwise \|
	45	\| 1 \|--------------->*
	46	\| \| ^
	47	+----------+ \|
	48	\| \|
	49	v 0xff \|
	50	+----------+<-\0xff \|
	51	/->\| \|--/ \|
	52	\| \| 2 \|--------------->*
	53	\| \| \| otherwise ^
	54	\| +----------+ \|
	55	\| \| \|
	56	\| v 0x00 \|
	57	\| +----------+ \|
	58	\| \| 3 \| \|
	59	\| \| \|--------------->*
	60	\| +----------+ otherwise ^
	61	\| \| \|
	62	0xff \| v 0xff \|
	63	\| +----------+ \|
	64	\--\| 4 \| \|
	65	\| \|----------------/
	66	+----------+ otherwise
	67	\|
	68	v 0x96
	69	+----------+
	70	\| FOUND \|
	71	+----------+
	72	*/
	73
	74	static unsigned char pac_find_sof(u8 sof_read,
	75	unsigned char *m, int len)
	76	{
	77	int i;
	78
	79	/* Search for the SOF marker (fixed part) in the header */
	80	for (i = 0; i < len; i++) {
	81	switch (*sof_read) {
	82	case 0:
	83	if (m[i] == 0xff)
	84	*sof_read = 1;
	85	break;
	86	case 1:
	87	if (m[i] == 0xff)
	88	*sof_read = 2;
	89	else
	90	*sof_read = 0;
	91	break;
	92	case 2:
	93	switch (m[i]) {
	94	case 0x00:
	95	*sof_read = 3;
	96	break;
	97	case 0xff:
	98	/* stay in this state */
	99	break;
	100	default:
	101	*sof_read = 0;
	102	}
	103	break;
	104	case 3:
	105	if (m[i] == 0xff)
	106	*sof_read = 4;
	107	else
	108	*sof_read = 0;
	109	break;
	110	case 4:
	111	switch (m[i]) {
	112	case 0x96:
	113	/* Pattern found */
	114	PDEBUG(D_FRAM,
	115	"SOF found, bytes to analyze: %u."
	116	" Frame starts at byte #%u",
	117	len, i + 1);
	118	*sof_read = 0;
	119	return m + i + 1;
	120	break;
	121	case 0xff:
	122	*sof_read = 2;
	123	break;
	124	default:
	125	*sof_read = 0;
	126	}
	127	break;
	128	default:
	129	*sof_read = 0;
	130	}
	131	}
	132
	133	return NULL;
	134	}