[media] introduce gspca-stk1135: Syntek STK1135 driver

Hello,
this is a new gspca driver for Syntek STK1135 webcams. The code is completely
new, but register values are based on Syntekdriver (stk11xx) by Nicolas VIVIEN
(http://syntekdriver.sourceforge.net

).
Only one webcam type is supported now - vendor 0x174f, device 0x6a31.
It's Asus F5RL laptop flippable webcam with MT9M112.
The camera works better than in Windows - initializes much faster and
provides more resolutions (the sensor can do almost any resolution - just
add it to the stk1135_modes[] - could this feature be somehow used by
applications to avoid SW scaling?).
Autoflip works too - when the camera is flipped around, the image is flipped
automatically.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/gspca/Kconfig

@@ -338,6 +338,15 @@ config USB_GSPCA_STK014
 	  To compile this driver as a module, choose M here: the
 	  module will be called gspca_stk014.
 
+config USB_GSPCA_STK1135
+	tristate "Syntek STK1135 USB Camera Driver"
+	depends on VIDEO_V4L2 && USB_GSPCA
+	help
+	  Say Y here if you want support for cameras based on the STK1135 chip.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called gspca_stk1135.
+
 config USB_GSPCA_STV0680
 	tristate "STV0680 USB Camera Driver"
 	depends on VIDEO_V4L2 && USB_GSPCA

drivers/media/usb/gspca/Makefile

@@ -34,6 +34,7 @@ obj-$(CONFIG_USB_GSPCA_SQ905C)   += gspca_sq905c.o
 obj-$(CONFIG_USB_GSPCA_SQ930X)   += gspca_sq930x.o
 obj-$(CONFIG_USB_GSPCA_SUNPLUS)  += gspca_sunplus.o
 obj-$(CONFIG_USB_GSPCA_STK014)   += gspca_stk014.o
+obj-$(CONFIG_USB_GSPCA_STK1135)  += gspca_stk1135.o
 obj-$(CONFIG_USB_GSPCA_STV0680)  += gspca_stv0680.o
 obj-$(CONFIG_USB_GSPCA_T613)     += gspca_t613.o
 obj-$(CONFIG_USB_GSPCA_TOPRO)    += gspca_topro.o
@@ -78,6 +79,7 @@ gspca_sq905-objs    := sq905.o
 gspca_sq905c-objs   := sq905c.o
 gspca_sq930x-objs   := sq930x.o
 gspca_stk014-objs   := stk014.o
+gspca_stk1135-objs  := stk1135.o
 gspca_stv0680-objs  := stv0680.o
 gspca_sunplus-objs  := sunplus.o
 gspca_t613-objs     := t613.o

drivers/media/usb/gspca/stk1135.h

+/*
+ * STK1135 registers
+ *
+ * Copyright (c) 2013 Ondrej Zary
+ *
+ * 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
+ * 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
+ */
+
+#define STK1135_REG_GCTRL	0x000	/* GPIO control */
+#define STK1135_REG_ICTRL	0x004	/* Interrupt control */
+#define STK1135_REG_IDATA	0x008	/* Interrupt data */
+#define STK1135_REG_RMCTL	0x00c	/* Remote wakeup control */
+#define STK1135_REG_POSVA	0x010	/* Power-on strapping data */
+
+#define STK1135_REG_SENSO	0x018	/* Sensor select options */
+#define STK1135_REG_PLLFD	0x01c	/* PLL frequency divider */
+
+#define STK1135_REG_SCTRL	0x100	/* Sensor control register */
+#define STK1135_REG_DCTRL	0x104	/* Decimation control register */
+#define STK1135_REG_CISPO	0x110	/* Capture image starting position */
+#define STK1135_REG_CIEPO	0x114	/* Capture image ending position */
+#define STK1135_REG_TCTRL	0x120	/* Test data control */
+
+#define STK1135_REG_SICTL	0x200	/* Serial interface control register */
+#define STK1135_REG_SBUSW	0x204	/* Serial bus write */
+#define STK1135_REG_SBUSR	0x208	/* Serial bus read */
+#define STK1135_REG_SCSI	0x20c	/* Software control serial interface */
+#define STK1135_REG_GSBWP	0x210	/* General serial bus write port */
+#define STK1135_REG_GSBRP	0x214	/* General serial bus read port */
+#define STK1135_REG_ASIC	0x2fc	/* Alternate serial interface control */
+
+#define STK1135_REG_TMGEN	0x300	/* Timing generator */
+#define STK1135_REG_TCP1	0x350	/* Timing control parameter 1 */
+
+struct stk1135_pkt_header {
+	u8 flags;
+	u8 seq;
+	__le16 gpio;
+} __packed;
+
+#define STK1135_HDR_FRAME_START	(1 << 7)
+#define STK1135_HDR_ODD		(1 << 6)
+#define STK1135_HDR_I2C_VBLANK	(1 << 5)
+
+#define STK1135_HDR_SEQ_MASK	0x3f