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Date:	Mon, 05 Jan 2015 14:19:16 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	John McMaster <johndmcmaster@...il.com>,
	linux-kernel@...r.kernel.org
CC:	linux-media@...r.kernel.org, m.chehab@...sung.com
Subject: Re: [PATCH] [media] gspca_touptek: Add support for ToupTek UCMOS
 series USB cameras

Hi John,

On 01-12-14 03:27, John McMaster wrote:
> Adds support for AmScope MU800 / ToupTek UCMOS08000KPB USB microscope camera.
>
> Signed-off-by: John McMaster <johndmcmaster@...il.com>

Thanks, I've added this driver to my gspca tree, and asked Mauro to
queue it up for 3.20.

Regards,

Hans

> ---
>   drivers/media/usb/gspca/Kconfig   |   10 +
>   drivers/media/usb/gspca/Makefile  |    2 +
>   drivers/media/usb/gspca/touptek.c |  729 +++++++++++++++++++++++++++++++++++++
>   3 files changed, 741 insertions(+)
>   create mode 100644 drivers/media/usb/gspca/touptek.c
>
> diff --git a/drivers/media/usb/gspca/Kconfig b/drivers/media/usb/gspca/Kconfig
> index eed10d7..60af3b1 100644
> --- a/drivers/media/usb/gspca/Kconfig
> +++ b/drivers/media/usb/gspca/Kconfig
> @@ -395,6 +395,16 @@ config USB_GSPCA_TOPRO
>   	  To compile this driver as a module, choose M here: the
>   	  module will be called gspca_topro.
>
> +config USB_GSPCA_TOUPTEK
> +	tristate "Touptek USB Camera Driver"
> +	depends on VIDEO_V4L2 && USB_GSPCA
> +	help
> +	  Say Y here if you want support for cameras based on the ToupTek UCMOS
> +	  / AmScope MU series camera.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called gspca_touptek.
> +
>   config USB_GSPCA_TV8532
>   	tristate "TV8532 USB Camera Driver"
>   	depends on VIDEO_V4L2 && USB_GSPCA
> diff --git a/drivers/media/usb/gspca/Makefile b/drivers/media/usb/gspca/Makefile
> index f46975e..9f5ccec 100644
> --- a/drivers/media/usb/gspca/Makefile
> +++ b/drivers/media/usb/gspca/Makefile
> @@ -39,6 +39,7 @@ 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
> +obj-$(CONFIG_USB_GSPCA_TOUPTEK)  += gspca_touptek.o
>   obj-$(CONFIG_USB_GSPCA_TV8532)   += gspca_tv8532.o
>   obj-$(CONFIG_USB_GSPCA_VC032X)   += gspca_vc032x.o
>   obj-$(CONFIG_USB_GSPCA_VICAM)    += gspca_vicam.o
> @@ -86,6 +87,7 @@ gspca_stv0680-objs  := stv0680.o
>   gspca_sunplus-objs  := sunplus.o
>   gspca_t613-objs     := t613.o
>   gspca_topro-objs    := topro.o
> +gspca_touptek-objs  := touptek.o
>   gspca_tv8532-objs   := tv8532.o
>   gspca_vc032x-objs   := vc032x.o
>   gspca_vicam-objs    := vicam.o
> diff --git a/drivers/media/usb/gspca/touptek.c b/drivers/media/usb/gspca/touptek.c
> new file mode 100644
> index 0000000..2fd876c
> --- /dev/null
> +++ b/drivers/media/usb/gspca/touptek.c
> @@ -0,0 +1,729 @@
> +/*
> + * ToupTek UCMOS / AmScope MU series camera driver
> + * TODO: contrast with ScopeTek / AmScope MDC cameras
> + *
> + * Copyright (C) 2012-2014 John McMaster <JohnDMcMaster@...il.com>
> + *
> + * Special thanks to Bushing for helping with the decrypt algorithm and
> + * Sean O'Sullivan / the Rensselaer Center for Open Source
> + * Software (RCOS) for helping me learn kernel development
> + *
> + * 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
> + */
> +
> +#include "gspca.h"
> +
> +#define MODULE_NAME "touptek"
> +
> +MODULE_AUTHOR("John McMaster");
> +MODULE_DESCRIPTION("ToupTek UCMOS / Amscope MU microscope camera driver");
> +MODULE_LICENSE("GPL");
> +
> +/*
> +Exposure reg is linear with exposure time
> +Exposure (sec), E (reg)
> +0.000400, 0x0002
> +0.001000, 0x0005
> +0.005000, 0x0019
> +0.020000, 0x0064
> +0.080000, 0x0190
> +0.400000, 0x07D0
> +1.000000, 0x1388
> +2.000000, 0x2710
> +
> +Three gain stages
> +0x1000: master channel enable bit
> +0x007F: low gain bits
> +0x0080: medium gain bit
> +0x0100: high gain bit
> +gain = enable * (1 + regH) * (1 + regM) * z * regL
> +
> +Gain implementation
> +Want to do something similar to mt9v011.c's set_balance
> +
> +Gain does not vary with resolution (checked 640x480 vs 1600x1200)
> +
> +Constant derivation:
> +
> +Raw data:
> +Gain,   GTOP,   B,	  R,	  GBOT
> +1.00,   0x105C, 0x1068, 0x10C8, 0x105C
> +1.20,   0x106E, 0x107E, 0x10D6, 0x106E
> +1.40,   0x10C0, 0x10CA, 0x10E5, 0x10C0
> +1.60,   0x10C9, 0x10D4, 0x10F3, 0x10C9
> +1.80,   0x10D2, 0x10DE, 0x11C1, 0x10D2
> +2.00,   0x10DC, 0x10E9, 0x11C8, 0x10DC
> +2.20,   0x10E5, 0x10F3, 0x11CF, 0x10E5
> +2.40,   0x10EE, 0x10FE, 0x11D7, 0x10EE
> +2.60,   0x10F7, 0x11C4, 0x11DE, 0x10F7
> +2.80,   0x11C0, 0x11CA, 0x11E5, 0x11C0
> +3.00,   0x11C5, 0x11CF, 0x11ED, 0x11C5
> +
> +zR = 0.0069605943152454778
> +	about 3/431 = 0.0069605568445475635
> +zB = 0.0095695970695970703
> +	about 6/627 = 0.0095693779904306216
> +zG = 0.010889328063241107
> +	about 6/551 = 0.010889292196007259
> +about 10 bits for constant + 7 bits for value => at least 17 bit intermediate
> +with 32 bit ints should be fine for overflow etc
> +Essentially gains are in range 0-0x001FF
> +
> +However, V4L expects a main gain channel + R and B balance
> +To keep things simple for now saturate the values of balance is too high/low
> +This isn't really ideal but easy way to fit the Linux model
> +
> +Converted using gain model turns out to be quite linear:
> +Gain, GTOP, B, R, GBOT
> +1.00, 92, 104, 144, 92
> +1.20, 110, 126, 172, 110
> +1.40, 128, 148, 202, 128
> +1.60, 146, 168, 230, 146
> +1.80, 164, 188, 260, 164
> +2.00, 184, 210, 288, 184
> +2.20, 202, 230, 316, 202
> +2.40, 220, 252, 348, 220
> +2.60, 238, 272, 376, 238
> +2.80, 256, 296, 404, 256
> +3.00, 276, 316, 436, 276
> +
> +Maximum gain is 0x7FF * 2 * 2 => 0x1FFC (8188)
> +or about 13 effective bits of gain
> +The highest the commercial driver goes in my setup 436
> +However, because could *maybe* damage circuits
> +limit the gain until have a reason to go higher
> +Solution: gain clipped and warning emitted
> +*/
> +#define GAIN_MAX		511
> +
> +/* Frame sync is a short read */
> +#define BULK_SIZE		0x4000
> +
> +/* MT9E001 reg names to give a rough approximation */
> +#define REG_COARSE_INTEGRATION_TIME_	0x3012
> +#define REG_GROUPED_PARAMETER_HOLD_	0x3022
> +#define REG_MODE_SELECT			0x0100
> +#define REG_OP_SYS_CLK_DIV		0x030A
> +#define REG_VT_SYS_CLK_DIV		0x0302
> +#define REG_PRE_PLL_CLK_DIV		0x0304
> +#define REG_VT_PIX_CLK_DIV		0x0300
> +#define REG_OP_PIX_CLK_DIV		0x0308
> +#define REG_PLL_MULTIPLIER		0x0306
> +#define REG_COARSE_INTEGRATION_TIME_	0x3012
> +#define REG_FRAME_LENGTH_LINES		0x0340
> +#define REG_FRAME_LENGTH_LINES_		0x300A
> +#define REG_GREEN1_GAIN			0x3056
> +#define REG_GREEN2_GAIN			0x305C
> +#define REG_GROUPED_PARAMETER_HOLD	0x0104
> +#define REG_LINE_LENGTH_PCK_		0x300C
> +#define REG_MODE_SELECT			0x0100
> +#define REG_PLL_MULTIPLIER		0x0306
> +#define REG_READ_MODE			0x3040
> +#define REG_BLUE_GAIN			0x3058
> +#define REG_RED_GAIN			0x305A
> +#define REG_RESET_REGISTER		0x301A
> +#define REG_SCALE_M			0x0404
> +#define REG_SCALING_MODE		0x0400
> +#define REG_SOFTWARE_RESET		0x0103
> +#define REG_X_ADDR_END			0x0348
> +#define REG_X_ADDR_START		0x0344
> +#define REG_X_ADDR_START		0x0344
> +#define REG_X_OUTPUT_SIZE		0x034C
> +#define REG_Y_ADDR_END			0x034A
> +#define REG_Y_ADDR_START		0x0346
> +#define REG_Y_OUTPUT_SIZE		0x034E
> +
> +
> +/* specific webcam descriptor */
> +struct sd {
> +	struct gspca_dev gspca_dev;	/* !! must be the first item */
> +	/* How many bytes this frame */
> +	unsigned int this_f;
> +
> +	/*
> +	Device has separate gains for each Bayer quadrant
> +	V4L supports master gain which is referenced to G1/G2 and supplies
> +	individual balance controls for R/B
> +	*/
> +	struct v4l2_ctrl *blue;
> +	struct v4l2_ctrl *red;
> +};
> +
> +/* Used to simplify reg write error handling */
> +struct cmd {
> +	u16 value;
> +	u16 index;
> +};
> +
> +static const struct v4l2_pix_format vga_mode[] = {
> +	{800, 600,
> +		V4L2_PIX_FMT_SGRBG8,
> +		V4L2_FIELD_NONE,
> +		.bytesperline = 800,
> +		.sizeimage = 800 * 600,
> +		.colorspace = V4L2_COLORSPACE_SRGB},
> +	{1600, 1200,
> +		V4L2_PIX_FMT_SGRBG8,
> +		V4L2_FIELD_NONE,
> +		.bytesperline = 1600,
> +		.sizeimage = 1600 * 1200,
> +		.colorspace = V4L2_COLORSPACE_SRGB},
> +	{3264, 2448,
> +		V4L2_PIX_FMT_SGRBG8,
> +		V4L2_FIELD_NONE,
> +		.bytesperline = 3264,
> +		.sizeimage = 3264 * 2448,
> +		.colorspace = V4L2_COLORSPACE_SRGB},
> +};
> +
> +/*
> +As theres no known frame sync, the only way to keep synced is to try hard
> +to never miss any packets
> +*/
> +#if MAX_NURBS < 4
> +#error "Not enough URBs in the gspca table"
> +#endif
> +
> +static int val_reply(struct gspca_dev *gspca_dev, const char *reply, int rc)
> +{
> +	if (rc < 0) {
> +		PERR("reply has error %d", rc);
> +		return -EIO;
> +	}
> +	if (rc != 1) {
> +		PERR("Bad reply size %d", rc);
> +		return -EIO;
> +	}
> +	if (reply[0] != 0x08) {
> +		PERR("Bad reply 0x%02X", reply[0]);
> +		return -EIO;
> +	}
> +	return 0;
> +}
> +
> +static void reg_w(struct gspca_dev *gspca_dev, u16 value, u16 index)
> +{
> +	char buff[1];
> +	int rc;
> +
> +	PDEBUG(D_USBO, "reg_w bReq=0x0B, bReqT=0xC0, wVal=0x%04X, wInd=0x%04X\n",
> +		value, index);
> +	rc = usb_control_msg(gspca_dev->dev, usb_rcvctrlpipe(gspca_dev->dev, 0),
> +		0x0B, 0xC0, value, index, buff, 1, 500);
> +	PDEBUG(D_USBO, "rc=%d, ret={0x%02X}", rc, buff[0]);
> +	if (rc < 0) {
> +		PERR("Failed reg_w(0x0B, 0xC0, 0x%04X, 0x%04X) w/ rc %d\n",
> +			value, index, rc);
> +		gspca_dev->usb_err = rc;
> +		return;
> +	}
> +	if (val_reply(gspca_dev, buff, rc)) {
> +		PERR("Bad reply to reg_w(0x0B, 0xC0, 0x%04X, 0x%04X\n",
> +			value, index);
> +		gspca_dev->usb_err = -EIO;
> +	}
> +}
> +
> +static void reg_w_buf(struct gspca_dev *gspca_dev,
> +		const struct cmd *p, int l)
> +{
> +	do {
> +		reg_w(gspca_dev, p->value, p->index);
> +		p++;
> +	} while (--l > 0);
> +}
> +
> +static void setexposure(struct gspca_dev *gspca_dev, s32 val)
> +{
> +	u16 value;
> +	unsigned int w = gspca_dev->pixfmt.width;
> +
> +	if (w == 800)
> +		value = val * 5;
> +	else if (w == 1600)
> +		value = val * 3;
> +	else if (w == 3264)
> +		value = val * 3 / 2;
> +	else {
> +		PERR("Invalid width %u\n", w);
> +		gspca_dev->usb_err = -EINVAL;
> +		return;
> +	}
> +	PDEBUG(D_STREAM, "exposure: 0x%04X ms\n", value);
> +	/* Wonder if theres a good reason for sending it twice */
> +	/* probably not but leave it in because...why not */
> +	reg_w(gspca_dev, value, REG_COARSE_INTEGRATION_TIME_);
> +	reg_w(gspca_dev, value, REG_COARSE_INTEGRATION_TIME_);
> +}
> +
> +static int gainify(int in)
> +{
> +	/*
> +	TODO: check if there are any issues with corner cases
> +	0x000 (0):0x07F (127): regL
> +	0x080 (128) - 0x0FF (255): regM, regL
> +	0x100 (256) - max: regH, regM, regL
> +	*/
> +	if (in <= 0x7F)
> +		return 0x1000 | in;
> +	else if (in <= 0xFF)
> +		return 0x1080 | in / 2;
> +	else
> +		return 0x1180 | in / 4;
> +}
> +
> +static void setggain(struct gspca_dev *gspca_dev, u16 global_gain)
> +{
> +	u16 normalized;
> +
> +	normalized = gainify(global_gain);
> +	PDEBUG(D_STREAM, "gain G1/G2 (0x%04X): 0x%04X (src 0x%04X)\n",
> +		 REG_GREEN1_GAIN,
> +		 normalized, global_gain);
> +
> +	reg_w(gspca_dev, normalized, REG_GREEN1_GAIN);
> +	reg_w(gspca_dev, normalized, REG_GREEN2_GAIN);
> +}
> +
> +static void setbgain(struct gspca_dev *gspca_dev,
> +		u16 gain, u16 global_gain)
> +{
> +	u16 normalized;
> +
> +	normalized = global_gain +
> +		((u32)global_gain) * gain / GAIN_MAX;
> +	if (normalized > GAIN_MAX) {
> +		PDEBUG(D_STREAM, "Truncating blue 0x%04X w/ value 0x%04X\n",
> +			 GAIN_MAX, normalized);
> +		normalized = GAIN_MAX;
> +	}
> +	normalized = gainify(normalized);
> +	PDEBUG(D_STREAM, "gain B (0x%04X): 0x%04X w/ source 0x%04X\n",
> +		 REG_BLUE_GAIN, normalized, gain);
> +
> +	reg_w(gspca_dev, normalized, REG_BLUE_GAIN);
> +}
> +
> +static void setrgain(struct gspca_dev *gspca_dev,
> +		u16 gain, u16 global_gain)
> +{
> +	u16 normalized;
> +
> +	normalized = global_gain +
> +		((u32)global_gain) * gain / GAIN_MAX;
> +	if (normalized > GAIN_MAX) {
> +		PDEBUG(D_STREAM, "Truncating gain 0x%04X w/ value 0x%04X\n",
> +			 GAIN_MAX, normalized);
> +		normalized = GAIN_MAX;
> +	}
> +	normalized = gainify(normalized);
> +	PDEBUG(D_STREAM, "gain R (0x%04X): 0x%04X w / source 0x%04X\n",
> +		 REG_RED_GAIN, normalized, gain);
> +
> +	reg_w(gspca_dev, normalized, REG_RED_GAIN);
> +}
> +
> +static void configure_wh(struct gspca_dev *gspca_dev)
> +{
> +	unsigned int w = gspca_dev->pixfmt.width;
> +
> +	PDEBUG(D_STREAM, "configure_wh\n");
> +
> +	if (w == 800) {
> +		static const struct cmd reg_init_res[] = {
> +			{0x0060, REG_X_ADDR_START},
> +			{0x0CD9, REG_X_ADDR_END},
> +			{0x0036, REG_Y_ADDR_START},
> +			{0x098F, REG_Y_ADDR_END},
> +			{0x07C7, REG_READ_MODE},
> +		};
> +
> +		reg_w_buf(gspca_dev,
> +			       reg_init_res, ARRAY_SIZE(reg_init_res));
> +	} else if (w == 1600) {
> +		static const struct cmd reg_init_res[] = {
> +			{0x009C, REG_X_ADDR_START},
> +			{0x0D19, REG_X_ADDR_END},
> +			{0x0068, REG_Y_ADDR_START},
> +			{0x09C5, REG_Y_ADDR_END},
> +			{0x06C3, REG_READ_MODE},
> +		};
> +
> +		reg_w_buf(gspca_dev,
> +			       reg_init_res, ARRAY_SIZE(reg_init_res));
> +	} else if (w == 3264) {
> +		static const struct cmd reg_init_res[] = {
> +			{0x00E8, REG_X_ADDR_START},
> +			{0x0DA7, REG_X_ADDR_END},
> +			{0x009E, REG_Y_ADDR_START},
> +			{0x0A2D, REG_Y_ADDR_END},
> +			{0x0241, REG_READ_MODE},
> +		};
> +
> +		reg_w_buf(gspca_dev,
> +			       reg_init_res, ARRAY_SIZE(reg_init_res));
> +	} else {
> +		PERR("bad width %u\n", w);
> +		gspca_dev->usb_err = -EINVAL;
> +		return;
> +	}
> +
> +	reg_w(gspca_dev, 0x0000, REG_SCALING_MODE);
> +	reg_w(gspca_dev, 0x0010, REG_SCALE_M);
> +	reg_w(gspca_dev, w, REG_X_OUTPUT_SIZE);
> +	reg_w(gspca_dev, gspca_dev->pixfmt.height, REG_Y_OUTPUT_SIZE);
> +
> +	if (w == 800) {
> +		reg_w(gspca_dev, 0x0384, REG_FRAME_LENGTH_LINES_);
> +		reg_w(gspca_dev, 0x0960, REG_LINE_LENGTH_PCK_);
> +	} else if (w == 1600) {
> +		reg_w(gspca_dev, 0x0640, REG_FRAME_LENGTH_LINES_);
> +		reg_w(gspca_dev, 0x0FA0, REG_LINE_LENGTH_PCK_);
> +	} else if (w == 3264) {
> +		reg_w(gspca_dev, 0x0B4B, REG_FRAME_LENGTH_LINES_);
> +		reg_w(gspca_dev, 0x1F40, REG_LINE_LENGTH_PCK_);
> +	} else {
> +		PERR("bad width %u\n", w);
> +		gspca_dev->usb_err = -EINVAL;
> +		return;
> +	}
> +}
> +
> +/* Packets that were encrypted, no idea if the grouping is significant */
> +static void configure_encrypted(struct gspca_dev *gspca_dev)
> +{
> +	static const struct cmd reg_init_begin[] = {
> +		{0x0100, REG_SOFTWARE_RESET},
> +		{0x0000, REG_MODE_SELECT},
> +		{0x0100, REG_GROUPED_PARAMETER_HOLD},
> +		{0x0004, REG_VT_PIX_CLK_DIV},
> +		{0x0001, REG_VT_SYS_CLK_DIV},
> +		{0x0008, REG_OP_PIX_CLK_DIV},
> +		{0x0001, REG_OP_SYS_CLK_DIV},
> +		{0x0004, REG_PRE_PLL_CLK_DIV},
> +		{0x0040, REG_PLL_MULTIPLIER},
> +		{0x0000, REG_GROUPED_PARAMETER_HOLD},
> +		{0x0100, REG_GROUPED_PARAMETER_HOLD},
> +	};
> +	static const struct cmd reg_init_end[] = {
> +		{0x0000, REG_GROUPED_PARAMETER_HOLD},
> +		{0x0301, 0x31AE},
> +		{0x0805, 0x3064},
> +		{0x0071, 0x3170},
> +		{0x10DE, REG_RESET_REGISTER},
> +		{0x0000, REG_MODE_SELECT},
> +		{0x0010, REG_PLL_MULTIPLIER},
> +		{0x0100, REG_MODE_SELECT},
> +	};
> +
> +	PDEBUG(D_STREAM, "Encrypted begin, w = %u\n", gspca_dev->pixfmt.width);
> +	reg_w_buf(gspca_dev, reg_init_begin, ARRAY_SIZE(reg_init_begin));
> +	configure_wh(gspca_dev);
> +	reg_w_buf(gspca_dev, reg_init_end, ARRAY_SIZE(reg_init_end));
> +	reg_w(gspca_dev, 0x0100, REG_GROUPED_PARAMETER_HOLD);
> +	reg_w(gspca_dev, 0x0000, REG_GROUPED_PARAMETER_HOLD);
> +
> +	PDEBUG(D_STREAM, "Encrypted end\n");
> +}
> +
> +static int configure(struct gspca_dev *gspca_dev)
> +{
> +	int rc;
> +	uint8_t buff[4];
> +
> +	PDEBUG(D_STREAM, "configure()\n");
> +
> +	/*
> +	First driver sets a sort of encryption key
> +	A number of futur requests of this type have wValue and wIndex encrypted
> +	as follows:
> +	-Compute key = this wValue rotate left by 4 bits
> +		(decrypt.py rotates right because we are decrypting)
> +	-Later packets encrypt packets by XOR'ing with key
> +		XOR encrypt/decrypt is symmetrical
> +		wValue, and wIndex are encrypted
> +		bRequest is not and bRequestType is always 0xC0
> +			This allows resyncing if key is unknown?
> +	By setting 0 we XOR with 0 and the shifting and XOR drops out
> +	*/
> +	rc = usb_control_msg(gspca_dev->dev, usb_rcvctrlpipe(gspca_dev->dev, 0),
> +			     0x16, 0xC0, 0x0000, 0x0000, buff, 2, 500);
> +	if (val_reply(gspca_dev, buff, rc)) {
> +		PERR("failed key req");
> +		return -EIO;
> +	}
> +
> +	/*
> +	Next does some sort of 2 packet challenge / response
> +	evidence suggests its an Atmel I2C crypto part but nobody cares to look
> +	(to make sure its not cloned hardware?)
> +	Ignore: I want to work with their hardware, not clone it
> +	16 bytes out challenge, requestType: 0x40
> +	16 bytes in response, requestType: 0xC0
> +	*/
> +
> +	rc = usb_control_msg(gspca_dev->dev, usb_sndctrlpipe(gspca_dev->dev, 0),
> +			     0x01, 0x40, 0x0001, 0x000F, NULL, 0, 500);
> +	if (rc < 0) {
> +		PERR("failed to replay packet 176 w/ rc %d\n", rc);
> +		return rc;
> +	}
> +
> +	rc = usb_control_msg(gspca_dev->dev, usb_sndctrlpipe(gspca_dev->dev, 0),
> +			     0x01, 0x40, 0x0000, 0x000F, NULL, 0, 500);
> +	if (rc < 0) {
> +		PERR("failed to replay packet 178 w/ rc %d\n", rc);
> +		return rc;
> +	}
> +
> +	rc = usb_control_msg(gspca_dev->dev, usb_sndctrlpipe(gspca_dev->dev, 0),
> +			     0x01, 0x40, 0x0001, 0x000F, NULL, 0, 500);
> +	if (rc < 0) {
> +		PERR("failed to replay packet 180 w/ rc %d\n", rc);
> +		return rc;
> +	}
> +
> +	/*
> +	Serial number?  Doesn't seem to be required
> +	cam1: \xE6\x0D\x00\x00, cam2: \x70\x19\x00\x00
> +	rc = usb_control_msg(gspca_dev->dev, usb_rcvctrlpipe(gspca_dev->dev, 0),
> +			     0x20, 0xC0, 0x0000, 0x0000, buff, 4, 500);
> +	*/
> +
> +	/* Large (EEPROM?) read, skip it since no idea what to do with it */
> +	gspca_dev->usb_err = 0;
> +	configure_encrypted(gspca_dev);
> +	if (gspca_dev->usb_err)
> +		return gspca_dev->usb_err;
> +
> +	/* Omitted this by accident, does not work without it */
> +	rc = usb_control_msg(gspca_dev->dev, usb_sndctrlpipe(gspca_dev->dev, 0),
> +			     0x01, 0x40, 0x0003, 0x000F, NULL, 0, 500);
> +
> +	PDEBUG(D_STREAM, "Configure complete\n");
> +	return 0;
> +}
> +
> +static int sd_config(struct gspca_dev *gspca_dev,
> +		     const struct usb_device_id *id)
> +{
> +	gspca_dev->cam.cam_mode = vga_mode;
> +	gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
> +
> +	/* Yes we want URBs and we want them now! */
> +	gspca_dev->cam.no_urb_create = 0;
> +	gspca_dev->cam.bulk_nurbs = 4;
> +	/* Largest size the windows driver uses */
> +	gspca_dev->cam.bulk_size = BULK_SIZE;
> +	/* Def need to use bulk transfers */
> +	gspca_dev->cam.bulk = 1;
> +
> +	return 0;
> +}
> +
> +static int sd_start(struct gspca_dev *gspca_dev)
> +{
> +	struct sd *sd = (struct sd *) gspca_dev;
> +	int rc;
> +
> +	sd->this_f = 0;
> +
> +	rc = configure(gspca_dev);
> +	if (rc < 0) {
> +		PERR("Failed configure");
> +		return rc;
> +	}
> +	/* First two frames have messed up gains
> +	Drop them to avoid special cases in user apps? */
> +	return 0;
> +}
> +
> +static void sd_pkt_scan(struct gspca_dev *gspca_dev,
> +			u8 *data,	/* isoc packet */
> +			int len)	/* iso packet length */
> +{
> +	struct sd *sd = (struct sd *) gspca_dev;
> +
> +	if (len != BULK_SIZE) {
> +		/* can we finish a frame? */
> +		if (sd->this_f + len == gspca_dev->pixfmt.sizeimage) {
> +			gspca_frame_add(gspca_dev, LAST_PACKET, data, len);
> +			PDEBUG(D_FRAM, "finish frame sz %u/%u w/ len %u\n",
> +				 sd->this_f, gspca_dev->pixfmt.sizeimage, len);
> +		/* lost some data, discard the frame */
> +		} else {
> +			gspca_frame_add(gspca_dev, DISCARD_PACKET, NULL, 0);
> +			PDEBUG(D_FRAM, "abort frame sz %u/%u w/ len %u\n",
> +				 sd->this_f, gspca_dev->pixfmt.sizeimage, len);
> +		}
> +		sd->this_f = 0;
> +	} else {
> +		if (sd->this_f == 0)
> +			gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
> +		else
> +			gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
> +		sd->this_f += len;
> +	}
> +}
> +
> +static int sd_init(struct gspca_dev *gspca_dev)
> +{
> +	return 0;
> +}
> +
> +static int sd_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct gspca_dev *gspca_dev =
> +		container_of(ctrl->handler, struct gspca_dev, ctrl_handler);
> +	struct sd *sd = (struct sd *) gspca_dev;
> +
> +	gspca_dev->usb_err = 0;
> +
> +	if (!gspca_dev->streaming)
> +		return 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_EXPOSURE:
> +		setexposure(gspca_dev, ctrl->val);
> +		break;
> +	case V4L2_CID_GAIN:
> +		/* gspca_dev->gain automatically updated */
> +		setggain(gspca_dev, gspca_dev->gain->val);
> +		break;
> +	case V4L2_CID_BLUE_BALANCE:
> +		sd->blue->val = ctrl->val;
> +		setbgain(gspca_dev, sd->blue->val, gspca_dev->gain->val);
> +		break;
> +	case V4L2_CID_RED_BALANCE:
> +		sd->red->val = ctrl->val;
> +		setrgain(gspca_dev, sd->red->val, gspca_dev->gain->val);
> +		break;
> +	}
> +	return gspca_dev->usb_err;
> +}
> +
> +static const struct v4l2_ctrl_ops sd_ctrl_ops = {
> +	.s_ctrl = sd_s_ctrl,
> +};
> +
> +static int sd_init_controls(struct gspca_dev *gspca_dev)
> +{
> +	struct sd *sd = (struct sd *) gspca_dev;
> +	struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
> +
> +	gspca_dev->vdev.ctrl_handler = hdl;
> +	v4l2_ctrl_handler_init(hdl, 4);
> +
> +	gspca_dev->exposure = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
> +	/* Mostly limited by URB timeouts */
> +	/* XXX: make dynamic based on frame rate? */
> +		V4L2_CID_EXPOSURE, 0, 800, 1, 350);
> +	gspca_dev->gain = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
> +			V4L2_CID_GAIN, 0, 511, 1, 128);
> +	sd->blue = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
> +			V4L2_CID_BLUE_BALANCE, 0, 1023, 1, 80);
> +	sd->red = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
> +			V4L2_CID_RED_BALANCE, 0, 1023, 1, 295);
> +
> +	if (hdl->error) {
> +		PERR("Could not initialize controls\n");
> +		return hdl->error;
> +	}
> +	return 0;
> +}
> +
> +/* sub-driver description */
> +static const struct sd_desc sd_desc = {
> +	.name = MODULE_NAME,
> +	.config = sd_config,
> +	.init = sd_init,
> +	.init_controls = sd_init_controls,
> +	.start = sd_start,
> +	.pkt_scan = sd_pkt_scan,
> +};
> +
> +/* Table of supported USB devices */
> +static const struct usb_device_id device_table[] = {
> +	/* Commented out devices should be related */
> +	/* AS: AmScope, TT: ToupTek */
> +	/* { USB_DEVICE(0x0547, 0x6035) },  TT UCMOS00350KPA */
> +	/* { USB_DEVICE(0x0547, 0x6130) },  TT UCMOS01300KPA */
> +	/* { USB_DEVICE(0x0547, 0x6200) },  TT UCMOS02000KPA */
> +	/* { USB_DEVICE(0x0547, 0x6310) },  TT UCMOS03100KPA */
> +	/* { USB_DEVICE(0x0547, 0x6510) },  TT UCMOS05100KPA */
> +	/* { USB_DEVICE(0x0547, 0x6800) },  TT UCMOS08000KPA */
> +	/* { USB_DEVICE(0x0547, 0x6801) },  TT UCMOS08000KPB */
> +	{ USB_DEVICE(0x0547, 0x6801) }, /* TT UCMOS08000KPB, AS MU800 */
> +	/* { USB_DEVICE(0x0547, 0x6900) },  TT UCMOS09000KPA */
> +	/* { USB_DEVICE(0x0547, 0x6901) },  TT UCMOS09000KPB */
> +	/* { USB_DEVICE(0x0547, 0x6010) },  TT UCMOS10000KPA */
> +	/* { USB_DEVICE(0x0547, 0x6014) },  TT UCMOS14000KPA */
> +	/* { USB_DEVICE(0x0547, 0x6131) },  TT UCMOS01300KMA */
> +	/* { USB_DEVICE(0x0547, 0x6511) },  TT UCMOS05100KMA */
> +	/* { USB_DEVICE(0x0547, 0x8080) },  TT UHCCD00800KPA */
> +	/* { USB_DEVICE(0x0547, 0x8140) },  TT UHCCD01400KPA */
> +	/* { USB_DEVICE(0x0547, 0x8141) },  TT EXCCD01400KPA */
> +	/* { USB_DEVICE(0x0547, 0x8200) },  TT UHCCD02000KPA */
> +	/* { USB_DEVICE(0x0547, 0x8201) },  TT UHCCD02000KPB */
> +	/* { USB_DEVICE(0x0547, 0x8310) },  TT UHCCD03100KPA */
> +	/* { USB_DEVICE(0x0547, 0x8500) },  TT UHCCD05000KPA */
> +	/* { USB_DEVICE(0x0547, 0x8510) },  TT UHCCD05100KPA */
> +	/* { USB_DEVICE(0x0547, 0x8600) },  TT UHCCD06000KPA */
> +	/* { USB_DEVICE(0x0547, 0x8800) },  TT UHCCD08000KPA */
> +	/* { USB_DEVICE(0x0547, 0x8315) },  TT UHCCD03150KPA */
> +	/* { USB_DEVICE(0x0547, 0x7800) },  TT UHCCD00800KMA */
> +	/* { USB_DEVICE(0x0547, 0x7140) },  TT UHCCD01400KMA */
> +	/* { USB_DEVICE(0x0547, 0x7141) },  TT UHCCD01400KMB */
> +	/* { USB_DEVICE(0x0547, 0x7200) },  TT UHCCD02000KMA */
> +	/* { USB_DEVICE(0x0547, 0x7315) },  TT UHCCD03150KMA */
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(usb, device_table);
> +
> +static int sd_probe(struct usb_interface *intf,
> +		    const struct usb_device_id *id)
> +{
> +	return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
> +			     THIS_MODULE);
> +}
> +
> +static struct usb_driver sd_driver = {
> +	.name = MODULE_NAME,
> +	.id_table = device_table,
> +	.probe = sd_probe,
> +	.disconnect = gspca_disconnect,
> +#ifdef CONFIG_PM
> +	.suspend = gspca_suspend,
> +	.resume = gspca_resume,
> +#endif
> +};
> +
> +static int __init sd_mod_init(void)
> +{
> +	int ret;
> +
> +	ret = usb_register(&sd_driver);
> +	if (ret < 0)
> +		return ret;
> +	return 0;
> +}
> +static void __exit sd_mod_exit(void)
> +{
> +	usb_deregister(&sd_driver);
> +}
> +
> +module_init(sd_mod_init);
> +module_exit(sd_mod_exit);
> +
>
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