From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 12:05:51 +0200
Subject: Adding upstream version 5.10.209.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/media/usb/gspca/m5602/m5602_po1030.c | 623 +++++++++++++++++++++++++++
 1 file changed, 623 insertions(+)
 create mode 100644 drivers/media/usb/gspca/m5602/m5602_po1030.c

(limited to 'drivers/media/usb/gspca/m5602/m5602_po1030.c')

diff --git a/drivers/media/usb/gspca/m5602/m5602_po1030.c b/drivers/media/usb/gspca/m5602/m5602_po1030.c
new file mode 100644
index 000000000..8fd99ceee
--- /dev/null
+++ b/drivers/media/usb/gspca/m5602/m5602_po1030.c
@@ -0,0 +1,623 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the po1030 sensor
+ *
+ * Copyright (c) 2008 Erik Andrén
+ * Copyright (c) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
+ * Copyright (c) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
+ *
+ * Portions of code to USB interface and ALi driver software,
+ * Copyright (c) 2006 Willem Duinker
+ * v4l2 interface modeled after the V4L2 driver
+ * for SN9C10x PC Camera Controllers
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include "m5602_po1030.h"
+
+static int po1030_s_ctrl(struct v4l2_ctrl *ctrl);
+static void po1030_dump_registers(struct sd *sd);
+
+static const unsigned char preinit_po1030[][3] = {
+	{BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
+	{BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
+	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
+	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
+	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
+	{BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},
+	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
+	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
+	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
+	{BRIDGE, M5602_XB_GPIO_DAT, 0x04},
+	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
+	{BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
+	{BRIDGE, M5602_XB_GPIO_DAT_H, 0x02},
+
+	{SENSOR, PO1030_AUTOCTRL2, PO1030_SENSOR_RESET | (1 << 2)},
+
+	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x04},
+	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
+	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
+	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
+	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
+	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
+	{BRIDGE, M5602_XB_GPIO_DAT, 0x00}
+};
+
+static const unsigned char init_po1030[][3] = {
+	{BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02},
+	{BRIDGE, M5602_XB_MCU_CLK_CTRL, 0xb0},
+	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
+	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
+	{BRIDGE, M5602_XB_ADC_CTRL, 0xc0},
+	{BRIDGE, M5602_XB_SENSOR_CTRL, 0x00},
+	{BRIDGE, M5602_XB_SENSOR_TYPE, 0x0c},
+
+	{SENSOR, PO1030_AUTOCTRL2, PO1030_SENSOR_RESET | (1 << 2)},
+
+	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
+	{BRIDGE, M5602_XB_GPIO_DAT, 0x04},
+	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
+	{BRIDGE, M5602_XB_GPIO_EN_L, 0x00},
+	{BRIDGE, M5602_XB_GPIO_DIR_H, 0x06},
+	{BRIDGE, M5602_XB_GPIO_DAT_H, 0x02},
+	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x04},
+	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
+	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
+	{BRIDGE, M5602_XB_GPIO_DAT, 0x00},
+
+	{SENSOR, PO1030_AUTOCTRL2, 0x04},
+
+	{SENSOR, PO1030_OUTFORMCTRL2, PO1030_RAW_RGB_BAYER},
+	{SENSOR, PO1030_AUTOCTRL1, PO1030_WEIGHT_WIN_2X},
+
+	{SENSOR, PO1030_CONTROL2, 0x03},
+	{SENSOR, 0x21, 0x90},
+	{SENSOR, PO1030_YTARGET, 0x60},
+	{SENSOR, 0x59, 0x13},
+	{SENSOR, PO1030_OUTFORMCTRL1, PO1030_HREF_ENABLE},
+	{SENSOR, PO1030_EDGE_ENH_OFF, 0x00},
+	{SENSOR, PO1030_EGA, 0x80},
+	{SENSOR, 0x78, 0x14},
+	{SENSOR, 0x6f, 0x01},
+	{SENSOR, PO1030_GLOBALGAINMAX, 0x14},
+	{SENSOR, PO1030_Cb_U_GAIN, 0x38},
+	{SENSOR, PO1030_Cr_V_GAIN, 0x38},
+	{SENSOR, PO1030_CONTROL1, PO1030_SHUTTER_MODE |
+				  PO1030_AUTO_SUBSAMPLING |
+				  PO1030_FRAME_EQUAL},
+	{SENSOR, PO1030_GC0, 0x10},
+	{SENSOR, PO1030_GC1, 0x20},
+	{SENSOR, PO1030_GC2, 0x40},
+	{SENSOR, PO1030_GC3, 0x60},
+	{SENSOR, PO1030_GC4, 0x80},
+	{SENSOR, PO1030_GC5, 0xa0},
+	{SENSOR, PO1030_GC6, 0xc0},
+	{SENSOR, PO1030_GC7, 0xff},
+
+	/* Set the width to 751 */
+	{SENSOR, PO1030_FRAMEWIDTH_H, 0x02},
+	{SENSOR, PO1030_FRAMEWIDTH_L, 0xef},
+
+	/* Set the height to 540 */
+	{SENSOR, PO1030_FRAMEHEIGHT_H, 0x02},
+	{SENSOR, PO1030_FRAMEHEIGHT_L, 0x1c},
+
+	/* Set the x window to 1 */
+	{SENSOR, PO1030_WINDOWX_H, 0x00},
+	{SENSOR, PO1030_WINDOWX_L, 0x01},
+
+	/* Set the y window to 1 */
+	{SENSOR, PO1030_WINDOWY_H, 0x00},
+	{SENSOR, PO1030_WINDOWY_L, 0x01},
+
+	/* with a very low lighted environment increase the exposure but
+	 * decrease the FPS (Frame Per Second) */
+	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00},
+	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xb0},
+
+	{BRIDGE, M5602_XB_GPIO_DIR, 0x05},
+	{BRIDGE, M5602_XB_GPIO_DAT, 0x00},
+	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06},
+	{BRIDGE, M5602_XB_GPIO_EN_L, 0x00},
+};
+
+static struct v4l2_pix_format po1030_modes[] = {
+	{
+		640,
+		480,
+		V4L2_PIX_FMT_SBGGR8,
+		V4L2_FIELD_NONE,
+		.sizeimage = 640 * 480,
+		.bytesperline = 640,
+		.colorspace = V4L2_COLORSPACE_SRGB,
+		.priv = 2
+	}
+};
+
+static const struct v4l2_ctrl_ops po1030_ctrl_ops = {
+	.s_ctrl = po1030_s_ctrl,
+};
+
+static const struct v4l2_ctrl_config po1030_greenbal_cfg = {
+	.ops	= &po1030_ctrl_ops,
+	.id	= M5602_V4L2_CID_GREEN_BALANCE,
+	.name	= "Green Balance",
+	.type	= V4L2_CTRL_TYPE_INTEGER,
+	.min	= 0,
+	.max	= 255,
+	.step	= 1,
+	.def	= PO1030_GREEN_GAIN_DEFAULT,
+	.flags	= V4L2_CTRL_FLAG_SLIDER,
+};
+
+int po1030_probe(struct sd *sd)
+{
+	u8 dev_id_h = 0, i;
+	int err;
+	struct gspca_dev *gspca_dev = (struct gspca_dev *)sd;
+
+	if (force_sensor) {
+		if (force_sensor == PO1030_SENSOR) {
+			pr_info("Forcing a %s sensor\n", po1030.name);
+			goto sensor_found;
+		}
+		/* If we want to force another sensor, don't try to probe this
+		 * one */
+		return -ENODEV;
+	}
+
+	gspca_dbg(gspca_dev, D_PROBE, "Probing for a po1030 sensor\n");
+
+	/* Run the pre-init to actually probe the unit */
+	for (i = 0; i < ARRAY_SIZE(preinit_po1030); i++) {
+		u8 data = preinit_po1030[i][2];
+		if (preinit_po1030[i][0] == SENSOR)
+			err = m5602_write_sensor(sd, preinit_po1030[i][1],
+						 &data, 1);
+		else
+			err = m5602_write_bridge(sd, preinit_po1030[i][1],
+						 data);
+		if (err < 0)
+			return err;
+	}
+
+	if (m5602_read_sensor(sd, PO1030_DEVID_H, &dev_id_h, 1))
+		return -ENODEV;
+
+	if (dev_id_h == 0x30) {
+		pr_info("Detected a po1030 sensor\n");
+		goto sensor_found;
+	}
+	return -ENODEV;
+
+sensor_found:
+	sd->gspca_dev.cam.cam_mode = po1030_modes;
+	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(po1030_modes);
+
+	return 0;
+}
+
+int po1030_init(struct sd *sd)
+{
+	int i, err = 0;
+
+	/* Init the sensor */
+	for (i = 0; i < ARRAY_SIZE(init_po1030) && !err; i++) {
+		u8 data[2] = {0x00, 0x00};
+
+		switch (init_po1030[i][0]) {
+		case BRIDGE:
+			err = m5602_write_bridge(sd,
+				init_po1030[i][1],
+				init_po1030[i][2]);
+			break;
+
+		case SENSOR:
+			data[0] = init_po1030[i][2];
+			err = m5602_write_sensor(sd,
+				init_po1030[i][1], data, 1);
+			break;
+
+		default:
+			pr_info("Invalid stream command, exiting init\n");
+			return -EINVAL;
+		}
+	}
+	if (err < 0)
+		return err;
+
+	if (dump_sensor)
+		po1030_dump_registers(sd);
+
+	return 0;
+}
+
+int po1030_init_controls(struct sd *sd)
+{
+	struct v4l2_ctrl_handler *hdl = &sd->gspca_dev.ctrl_handler;
+
+	sd->gspca_dev.vdev.ctrl_handler = hdl;
+	v4l2_ctrl_handler_init(hdl, 9);
+
+	sd->auto_white_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
+					       V4L2_CID_AUTO_WHITE_BALANCE,
+					       0, 1, 1, 0);
+	sd->green_bal = v4l2_ctrl_new_custom(hdl, &po1030_greenbal_cfg, NULL);
+	sd->red_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
+					V4L2_CID_RED_BALANCE, 0, 255, 1,
+					PO1030_RED_GAIN_DEFAULT);
+	sd->blue_bal = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops,
+					V4L2_CID_BLUE_BALANCE, 0, 255, 1,
+					PO1030_BLUE_GAIN_DEFAULT);
+
+	sd->autoexpo = v4l2_ctrl_new_std_menu(hdl, &po1030_ctrl_ops,
+			  V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_MANUAL);
+	sd->expo = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_EXPOSURE,
+			  0, 0x2ff, 1, PO1030_EXPOSURE_DEFAULT);
+
+	sd->gain = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_GAIN, 0,
+				     0x4f, 1, PO1030_GLOBAL_GAIN_DEFAULT);
+
+	sd->hflip = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_HFLIP,
+				      0, 1, 1, 0);
+	sd->vflip = v4l2_ctrl_new_std(hdl, &po1030_ctrl_ops, V4L2_CID_VFLIP,
+				      0, 1, 1, 0);
+
+	if (hdl->error) {
+		pr_err("Could not initialize controls\n");
+		return hdl->error;
+	}
+
+	v4l2_ctrl_auto_cluster(4, &sd->auto_white_bal, 0, false);
+	v4l2_ctrl_auto_cluster(2, &sd->autoexpo, 0, false);
+	v4l2_ctrl_cluster(2, &sd->hflip);
+
+	return 0;
+}
+
+int po1030_start(struct sd *sd)
+{
+	struct cam *cam = &sd->gspca_dev.cam;
+	int i, err = 0;
+	int width = cam->cam_mode[sd->gspca_dev.curr_mode].width;
+	int height = cam->cam_mode[sd->gspca_dev.curr_mode].height;
+	int ver_offs = cam->cam_mode[sd->gspca_dev.curr_mode].priv;
+	u8 data;
+
+	switch (width) {
+	case 320:
+		data = PO1030_SUBSAMPLING;
+		err = m5602_write_sensor(sd, PO1030_CONTROL3, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = ((width + 3) >> 8) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_H, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = (width + 3) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_L, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = ((height + 1) >> 8) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_H, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = (height + 1) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_L, &data, 1);
+
+		height += 6;
+		width -= 1;
+		break;
+
+	case 640:
+		data = 0;
+		err = m5602_write_sensor(sd, PO1030_CONTROL3, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = ((width + 7) >> 8) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_H, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = (width + 7) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWWIDTH_L, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = ((height + 3) >> 8) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_H, &data, 1);
+		if (err < 0)
+			return err;
+
+		data = (height + 3) & 0xff;
+		err = m5602_write_sensor(sd, PO1030_WINDOWHEIGHT_L, &data, 1);
+
+		height += 12;
+		width -= 2;
+		break;
+	}
+	err = m5602_write_bridge(sd, M5602_XB_SENSOR_TYPE, 0x0c);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_LINE_OF_FRAME_H, 0x81);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_PIX_OF_LINE_H, 0x82);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0x01);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA,
+				 ((ver_offs >> 8) & 0xff));
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (ver_offs & 0xff));
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < 2 && !err; i++)
+		err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height >> 8) & 0xff);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, (height & 0xff));
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < 2 && !err; i++)
+		err = m5602_write_bridge(sd, M5602_XB_VSYNC_PARA, 0);
+
+	for (i = 0; i < 2 && !err; i++)
+		err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
+
+	for (i = 0; i < 2 && !err; i++)
+		err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, 0);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, (width >> 8) & 0xff);
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_HSYNC_PARA, (width & 0xff));
+	if (err < 0)
+		return err;
+
+	err = m5602_write_bridge(sd, M5602_XB_SIG_INI, 0);
+	return err;
+}
+
+static int po1030_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	gspca_dbg(gspca_dev, D_CONF, "Set exposure to %d\n", val & 0xffff);
+
+	i2c_data = ((val & 0xff00) >> 8);
+	gspca_dbg(gspca_dev, D_CONF, "Set exposure to high byte to 0x%x\n",
+		  i2c_data);
+
+	err = m5602_write_sensor(sd, PO1030_INTEGLINES_H,
+				  &i2c_data, 1);
+	if (err < 0)
+		return err;
+
+	i2c_data = (val & 0xff);
+	gspca_dbg(gspca_dev, D_CONF, "Set exposure to low byte to 0x%x\n",
+		  i2c_data);
+	err = m5602_write_sensor(sd, PO1030_INTEGLINES_M,
+				  &i2c_data, 1);
+
+	return err;
+}
+
+static int po1030_set_gain(struct gspca_dev *gspca_dev, __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	i2c_data = val & 0xff;
+	gspca_dbg(gspca_dev, D_CONF, "Set global gain to %d\n", i2c_data);
+	err = m5602_write_sensor(sd, PO1030_GLOBALGAIN,
+				 &i2c_data, 1);
+	return err;
+}
+
+static int po1030_set_hvflip(struct gspca_dev *gspca_dev)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	gspca_dbg(gspca_dev, D_CONF, "Set hvflip %d %d\n",
+		  sd->hflip->val, sd->vflip->val);
+	err = m5602_read_sensor(sd, PO1030_CONTROL2, &i2c_data, 1);
+	if (err < 0)
+		return err;
+
+	i2c_data = (0x3f & i2c_data) | (sd->hflip->val << 7) |
+		   (sd->vflip->val << 6);
+
+	err = m5602_write_sensor(sd, PO1030_CONTROL2,
+				 &i2c_data, 1);
+
+	return err;
+}
+
+static int po1030_set_red_balance(struct gspca_dev *gspca_dev, __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	i2c_data = val & 0xff;
+	gspca_dbg(gspca_dev, D_CONF, "Set red gain to %d\n", i2c_data);
+	err = m5602_write_sensor(sd, PO1030_RED_GAIN,
+				  &i2c_data, 1);
+	return err;
+}
+
+static int po1030_set_blue_balance(struct gspca_dev *gspca_dev, __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	i2c_data = val & 0xff;
+	gspca_dbg(gspca_dev, D_CONF, "Set blue gain to %d\n", i2c_data);
+	err = m5602_write_sensor(sd, PO1030_BLUE_GAIN,
+				  &i2c_data, 1);
+
+	return err;
+}
+
+static int po1030_set_green_balance(struct gspca_dev *gspca_dev, __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	i2c_data = val & 0xff;
+	gspca_dbg(gspca_dev, D_CONF, "Set green gain to %d\n", i2c_data);
+
+	err = m5602_write_sensor(sd, PO1030_GREEN_1_GAIN,
+			   &i2c_data, 1);
+	if (err < 0)
+		return err;
+
+	return m5602_write_sensor(sd, PO1030_GREEN_2_GAIN,
+				 &i2c_data, 1);
+}
+
+static int po1030_set_auto_white_balance(struct gspca_dev *gspca_dev,
+					 __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	err = m5602_read_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
+	if (err < 0)
+		return err;
+
+	gspca_dbg(gspca_dev, D_CONF, "Set auto white balance to %d\n", val);
+	i2c_data = (i2c_data & 0xfe) | (val & 0x01);
+	err = m5602_write_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
+	return err;
+}
+
+static int po1030_set_auto_exposure(struct gspca_dev *gspca_dev,
+				    __s32 val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	u8 i2c_data;
+	int err;
+
+	err = m5602_read_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
+	if (err < 0)
+		return err;
+
+	gspca_dbg(gspca_dev, D_CONF, "Set auto exposure to %d\n", val);
+	val = (val == V4L2_EXPOSURE_AUTO);
+	i2c_data = (i2c_data & 0xfd) | ((val & 0x01) << 1);
+	return m5602_write_sensor(sd, PO1030_AUTOCTRL1, &i2c_data, 1);
+}
+
+void po1030_disconnect(struct sd *sd)
+{
+	sd->sensor = NULL;
+}
+
+static int po1030_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;
+	int err;
+
+	if (!gspca_dev->streaming)
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUTO_WHITE_BALANCE:
+		err = po1030_set_auto_white_balance(gspca_dev, ctrl->val);
+		if (err || ctrl->val)
+			return err;
+		err = po1030_set_green_balance(gspca_dev, sd->green_bal->val);
+		if (err)
+			return err;
+		err = po1030_set_red_balance(gspca_dev, sd->red_bal->val);
+		if (err)
+			return err;
+		err = po1030_set_blue_balance(gspca_dev, sd->blue_bal->val);
+		break;
+	case V4L2_CID_EXPOSURE_AUTO:
+		err = po1030_set_auto_exposure(gspca_dev, ctrl->val);
+		if (err || ctrl->val == V4L2_EXPOSURE_AUTO)
+			return err;
+		err = po1030_set_exposure(gspca_dev, sd->expo->val);
+		break;
+	case V4L2_CID_GAIN:
+		err = po1030_set_gain(gspca_dev, ctrl->val);
+		break;
+	case V4L2_CID_HFLIP:
+		err = po1030_set_hvflip(gspca_dev);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return err;
+}
+
+static void po1030_dump_registers(struct sd *sd)
+{
+	int address;
+	u8 value = 0;
+
+	pr_info("Dumping the po1030 sensor core registers\n");
+	for (address = 0; address < 0x7f; address++) {
+		m5602_read_sensor(sd, address, &value, 1);
+		pr_info("register 0x%x contains 0x%x\n", address, value);
+	}
+
+	pr_info("po1030 register state dump complete\n");
+
+	pr_info("Probing for which registers that are read/write\n");
+	for (address = 0; address < 0xff; address++) {
+		u8 old_value, ctrl_value;
+		u8 test_value[2] = {0xff, 0xff};
+
+		m5602_read_sensor(sd, address, &old_value, 1);
+		m5602_write_sensor(sd, address, test_value, 1);
+		m5602_read_sensor(sd, address, &ctrl_value, 1);
+
+		if (ctrl_value == test_value[0])
+			pr_info("register 0x%x is writeable\n", address);
+		else
+			pr_info("register 0x%x is read only\n", address);
+
+		/* Restore original value */
+		m5602_write_sensor(sd, address, &old_value, 1);
+	}
+}
-- 
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