drivers/media/video/gspca/m5602/m5602_po1030.c - kernel/msm-4.9 - Gitiles

 /*
  * 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
  *
  * 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, version 2.
  *
  */

 #include "m5602_po1030.h"

 int po1030_probe(struct sd *sd)
 {
 	u8 prod_id = 0, ver_id = 0, i;

 	if (force_sensor) {
 		if (force_sensor == PO1030_SENSOR) {
 			info("Forcing a %s sensor", po1030.name);
 			goto sensor_found;
 		}
 		/* If we want to force another sensor, don't try to probe this
 		 * one */
 		return -ENODEV;
 	}

 	info("Probing for a po1030 sensor");

 	/* 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)
 			po1030_write_sensor(sd,
 				preinit_po1030[i][1], &data, 1);
 		else
 			m5602_write_bridge(sd, preinit_po1030[i][1], data);
 	}

 	if (po1030_read_sensor(sd, 0x3, &prod_id, 1))
 		return -ENODEV;

 	if (po1030_read_sensor(sd, 0x4, &ver_id, 1))
 		return -ENODEV;

 	if ((prod_id == 0x02) && (ver_id == 0xef)) {
 		info("Detected a po1030 sensor");
 		goto sensor_found;
 	}
 	return -ENODEV;

 sensor_found:
 	sd->gspca_dev.cam.cam_mode = po1030.modes;
 	sd->gspca_dev.cam.nmodes = po1030.nmodes;
 	sd->desc->ctrls = po1030.ctrls;
 	sd->desc->nctrls = po1030.nctrls;
 	return 0;
 }

 int po1030_read_sensor(struct sd *sd, const u8 address,
 			u8 *i2c_data, const u8 len)
 {
 	int err, i;

 	do {
 		err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, i2c_data);
 	} while ((*i2c_data & I2C_BUSY) && !err);

 	m5602_write_bridge(sd, M5602_XB_I2C_DEV_ADDR,
 			   sd->sensor->i2c_slave_id);
 	m5602_write_bridge(sd, M5602_XB_I2C_REG_ADDR, address);
 	m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x10 + len);
 	m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x08);

 	for (i = 0; i < len; i++) {
 		err = m5602_read_bridge(sd, M5602_XB_I2C_DATA, &(i2c_data[i]));

 		PDEBUG(D_CONF, "Reading sensor register "
 				"0x%x containing 0x%x ", address, *i2c_data);
 	}
 	return (err < 0) ? err : 0;
 }

 int po1030_write_sensor(struct sd *sd, const u8 address,
 			u8 *i2c_data, const u8 len)
 {
 	int err, i;
 	u8 *p;
 	struct usb_device *udev = sd->gspca_dev.dev;
 	__u8 *buf = sd->gspca_dev.usb_buf;

 	/* The po1030 only supports one byte writes */
 	if (len > 1 || !len)
 		return -EINVAL;

 	memcpy(buf, sensor_urb_skeleton, sizeof(sensor_urb_skeleton));

 	buf[11] = sd->sensor->i2c_slave_id;
 	buf[15] = address;

 	p = buf + 16;

 	/* Copy a four byte write sequence for each byte to be written to */
 	for (i = 0; i < len; i++) {
 		memcpy(p, sensor_urb_skeleton + 16, 4);
 		p[3] = i2c_data[i];
 		p += 4;
 		PDEBUG(D_CONF, "Writing sensor register 0x%x with 0x%x",
 		       address, i2c_data[i]);
 	}

 	/* Copy the footer */
 	memcpy(p, sensor_urb_skeleton + 20, 4);

 	/* Set the total length */
 	p[3] = 0x10 + len;

 	err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 			      0x04, 0x40, 0x19,
 			      0x0000, buf,
 			      20 + len * 4, M5602_URB_MSG_TIMEOUT);

 	return (err < 0) ? err : 0;
 }

 int po1030_init(struct sd *sd)
 {
 	int i, err = 0;

 	/* Init the sensor */
 	for (i = 0; i < ARRAY_SIZE(init_po1030); 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 = po1030_write_sensor(sd,
 				init_po1030[i][1], data, 1);
 			break;

 		case SENSOR_LONG:
 			data[0] = init_po1030[i][2];
 			data[1] = init_po1030[i][3];
 			err = po1030_write_sensor(sd,
 				init_po1030[i][1], data, 2);
 			break;
 		default:
 			info("Invalid stream command, exiting init");
 			return -EINVAL;
 		}
 	}

 	if (dump_sensor)
 		po1030_dump_registers(sd);

 	return (err < 0) ? err : 0;
 }

 int po1030_get_exposure(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	err = po1030_read_sensor(sd, PO1030_REG_INTEGLINES_H,
 				 &i2c_data, 1);
 	if (err < 0)
 		goto out;
 	*val = (i2c_data << 8);

 	err = po1030_read_sensor(sd, PO1030_REG_INTEGLINES_M,
 				 &i2c_data, 1);
 	*val |= i2c_data;

 	PDEBUG(D_V4L2, "Exposure read as %d", *val);
 out:
 	return (err < 0) ? err : 0;
 }

 int po1030_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	PDEBUG(D_V4L2, "Set exposure to %d", val & 0xffff);

 	i2c_data = ((val & 0xff00) >> 8);
 	PDEBUG(D_V4L2, "Set exposure to high byte to 0x%x",
 	       i2c_data);

 	err = po1030_write_sensor(sd, PO1030_REG_INTEGLINES_H,
 				  &i2c_data, 1);
 	if (err < 0)
 		goto out;

 	i2c_data = (val & 0xff);
 	PDEBUG(D_V4L2, "Set exposure to low byte to 0x%x",
 	       i2c_data);
 	err = po1030_write_sensor(sd, PO1030_REG_INTEGLINES_M,
 				  &i2c_data, 1);

 out:
 	return (err < 0) ? err : 0;
 }

 int po1030_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	err = po1030_read_sensor(sd, PO1030_REG_GLOBALGAIN,
 				 &i2c_data, 1);
 	*val = i2c_data;
 	PDEBUG(D_V4L2, "Read global gain %d", *val);

 	return (err < 0) ? err : 0;
 }

 int po1030_get_hflip(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	err = po1030_read_sensor(sd, PO1030_REG_CONTROL2,
 				 &i2c_data, 1);

 	*val = (i2c_data >> 7) & 0x01 ;

 	PDEBUG(D_V4L2, "Read hflip %d", *val);

 	return (err < 0) ? err : 0;
 }

 int po1030_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	PDEBUG(D_V4L2, "Set hflip %d", val);

 	i2c_data = (val & 0x01) << 7;

 	err = po1030_write_sensor(sd, PO1030_REG_CONTROL2,
 				  &i2c_data, 1);

 	return (err < 0) ? err : 0;
 }

 int po1030_get_vflip(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	err = po1030_read_sensor(sd, PO1030_REG_GLOBALGAIN,
 				 &i2c_data, 1);

 	*val = (i2c_data >> 6) & 0x01;

 	PDEBUG(D_V4L2, "Read vflip %d", *val);

 	return (err < 0) ? err : 0;
 }

 int po1030_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	PDEBUG(D_V4L2, "Set vflip %d", val);

 	i2c_data = (val & 0x01) << 6;

 	err = po1030_write_sensor(sd, PO1030_REG_CONTROL2,
 				  &i2c_data, 1);

 	return (err < 0) ? err : 0;
 }

 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;
 	PDEBUG(D_V4L2, "Set global gain to %d", i2c_data);
 	err = po1030_write_sensor(sd, PO1030_REG_GLOBALGAIN,
 				  &i2c_data, 1);
 	return (err < 0) ? err : 0;
 }

 int po1030_get_red_balance(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	err = po1030_read_sensor(sd, PO1030_REG_RED_GAIN,
 				 &i2c_data, 1);
 	*val = i2c_data;
 	PDEBUG(D_V4L2, "Read red gain %d", *val);
 	return (err < 0) ? err : 0;
 }

 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;
 	PDEBUG(D_V4L2, "Set red gain to %d", i2c_data);
 	err = po1030_write_sensor(sd, PO1030_REG_RED_GAIN,
 				  &i2c_data, 1);
 	return (err < 0) ? err : 0;
 }

 int po1030_get_blue_balance(struct gspca_dev *gspca_dev, __s32 *val)
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	u8 i2c_data;
 	int err;

 	err = po1030_read_sensor(sd, PO1030_REG_BLUE_GAIN,
 				 &i2c_data, 1);
 	*val = i2c_data;
 	PDEBUG(D_V4L2, "Read blue gain %d", *val);

 	return (err < 0) ? err : 0;
 }

 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;
 	PDEBUG(D_V4L2, "Set blue gain to %d", i2c_data);
 	err = po1030_write_sensor(sd, PO1030_REG_BLUE_GAIN,
 				  &i2c_data, 1);

 	return (err < 0) ? err : 0;
 }

 int po1030_power_down(struct sd *sd)
 {
 	return 0;
 }

 void po1030_dump_registers(struct sd *sd)
 {
 	int address;
 	u8 value = 0;

 	info("Dumping the po1030 sensor core registers");
 	for (address = 0; address < 0x7f; address++) {
 		po1030_read_sensor(sd, address, &value, 1);
 		info("register 0x%x contains 0x%x",
 		     address, value);
 	}

 	info("po1030 register state dump complete");

 	info("Probing for which registers that are read/write");
 	for (address = 0; address < 0xff; address++) {
 		u8 old_value, ctrl_value;
 		u8 test_value[2] = {0xff, 0xff};

 		po1030_read_sensor(sd, address, &old_value, 1);
 		po1030_write_sensor(sd, address, test_value, 1);
 		po1030_read_sensor(sd, address, &ctrl_value, 1);

 		if (ctrl_value == test_value[0])
 			info("register 0x%x is writeable", address);
 		else
 			info("register 0x%x is read only", address);

 		/* Restore original value */
 		po1030_write_sensor(sd, address, &old_value, 1);
 	}
 }
	/*
	* 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
	*
	* 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, version 2.
	*
	*/

	#include "m5602_po1030.h"

	int po1030_probe(struct sd *sd)
	{
	u8 prod_id = 0, ver_id = 0, i;

	if (force_sensor) {
	if (force_sensor == PO1030_SENSOR) {
	info("Forcing a %s sensor", po1030.name);
	goto sensor_found;
	}
	/* If we want to force another sensor, don't try to probe this
	* one */
	return -ENODEV;
	}

	info("Probing for a po1030 sensor");

	/* 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)
	po1030_write_sensor(sd,
	preinit_po1030[i][1], &data, 1);
	else
	m5602_write_bridge(sd, preinit_po1030[i][1], data);
	}

	if (po1030_read_sensor(sd, 0x3, &prod_id, 1))
	return -ENODEV;

	if (po1030_read_sensor(sd, 0x4, &ver_id, 1))
	return -ENODEV;

	if ((prod_id == 0x02) && (ver_id == 0xef)) {
	info("Detected a po1030 sensor");
	goto sensor_found;
	}
	return -ENODEV;

	sensor_found:
	sd->gspca_dev.cam.cam_mode = po1030.modes;
	sd->gspca_dev.cam.nmodes = po1030.nmodes;
	sd->desc->ctrls = po1030.ctrls;
	sd->desc->nctrls = po1030.nctrls;
	return 0;
	}

	int po1030_read_sensor(struct sd *sd, const u8 address,
	u8 *i2c_data, const u8 len)
	{
	int err, i;

	do {
	err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, i2c_data);
	} while ((*i2c_data & I2C_BUSY) && !err);

	m5602_write_bridge(sd, M5602_XB_I2C_DEV_ADDR,
	sd->sensor->i2c_slave_id);
	m5602_write_bridge(sd, M5602_XB_I2C_REG_ADDR, address);
	m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x10 + len);
	m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x08);

	for (i = 0; i < len; i++) {
	err = m5602_read_bridge(sd, M5602_XB_I2C_DATA, &(i2c_data[i]));

	PDEBUG(D_CONF, "Reading sensor register "
	"0x%x containing 0x%x ", address, *i2c_data);
	}
	return (err < 0) ? err : 0;
	}

	int po1030_write_sensor(struct sd *sd, const u8 address,
	u8 *i2c_data, const u8 len)
	{
	int err, i;
	u8 *p;
	struct usb_device *udev = sd->gspca_dev.dev;
	__u8 *buf = sd->gspca_dev.usb_buf;

	/* The po1030 only supports one byte writes */
	if (len > 1 \|\| !len)
	return -EINVAL;

	memcpy(buf, sensor_urb_skeleton, sizeof(sensor_urb_skeleton));

	buf[11] = sd->sensor->i2c_slave_id;
	buf[15] = address;

	p = buf + 16;

	/* Copy a four byte write sequence for each byte to be written to */
	for (i = 0; i < len; i++) {
	memcpy(p, sensor_urb_skeleton + 16, 4);
	p[3] = i2c_data[i];
	p += 4;
	PDEBUG(D_CONF, "Writing sensor register 0x%x with 0x%x",
	address, i2c_data[i]);
	}

	/* Copy the footer */
	memcpy(p, sensor_urb_skeleton + 20, 4);

	/* Set the total length */
	p[3] = 0x10 + len;

	err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
	0x04, 0x40, 0x19,
	0x0000, buf,
	20 + len * 4, M5602_URB_MSG_TIMEOUT);

	return (err < 0) ? err : 0;
	}

	int po1030_init(struct sd *sd)
	{
	int i, err = 0;

	/* Init the sensor */
	for (i = 0; i < ARRAY_SIZE(init_po1030); 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 = po1030_write_sensor(sd,
	init_po1030[i][1], data, 1);
	break;

	case SENSOR_LONG:
	data[0] = init_po1030[i][2];
	data[1] = init_po1030[i][3];
	err = po1030_write_sensor(sd,
	init_po1030[i][1], data, 2);
	break;
	default:
	info("Invalid stream command, exiting init");
	return -EINVAL;
	}
	}

	if (dump_sensor)
	po1030_dump_registers(sd);

	return (err < 0) ? err : 0;
	}

	int po1030_get_exposure(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	err = po1030_read_sensor(sd, PO1030_REG_INTEGLINES_H,
	&i2c_data, 1);
	if (err < 0)
	goto out;
	*val = (i2c_data << 8);

	err = po1030_read_sensor(sd, PO1030_REG_INTEGLINES_M,
	&i2c_data, 1);
	*val \|= i2c_data;

	PDEBUG(D_V4L2, "Exposure read as %d", *val);
	out:
	return (err < 0) ? err : 0;
	}

	int po1030_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	PDEBUG(D_V4L2, "Set exposure to %d", val & 0xffff);

	i2c_data = ((val & 0xff00) >> 8);
	PDEBUG(D_V4L2, "Set exposure to high byte to 0x%x",
	i2c_data);

	err = po1030_write_sensor(sd, PO1030_REG_INTEGLINES_H,
	&i2c_data, 1);
	if (err < 0)
	goto out;

	i2c_data = (val & 0xff);
	PDEBUG(D_V4L2, "Set exposure to low byte to 0x%x",
	i2c_data);
	err = po1030_write_sensor(sd, PO1030_REG_INTEGLINES_M,
	&i2c_data, 1);

	out:
	return (err < 0) ? err : 0;
	}

	int po1030_get_gain(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	err = po1030_read_sensor(sd, PO1030_REG_GLOBALGAIN,
	&i2c_data, 1);
	*val = i2c_data;
	PDEBUG(D_V4L2, "Read global gain %d", *val);

	return (err < 0) ? err : 0;
	}

	int po1030_get_hflip(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	err = po1030_read_sensor(sd, PO1030_REG_CONTROL2,
	&i2c_data, 1);

	*val = (i2c_data >> 7) & 0x01 ;

	PDEBUG(D_V4L2, "Read hflip %d", *val);

	return (err < 0) ? err : 0;
	}

	int po1030_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	PDEBUG(D_V4L2, "Set hflip %d", val);

	i2c_data = (val & 0x01) << 7;

	err = po1030_write_sensor(sd, PO1030_REG_CONTROL2,
	&i2c_data, 1);

	return (err < 0) ? err : 0;
	}

	int po1030_get_vflip(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	err = po1030_read_sensor(sd, PO1030_REG_GLOBALGAIN,
	&i2c_data, 1);

	*val = (i2c_data >> 6) & 0x01;

	PDEBUG(D_V4L2, "Read vflip %d", *val);

	return (err < 0) ? err : 0;
	}

	int po1030_set_vflip(struct gspca_dev *gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	PDEBUG(D_V4L2, "Set vflip %d", val);

	i2c_data = (val & 0x01) << 6;

	err = po1030_write_sensor(sd, PO1030_REG_CONTROL2,
	&i2c_data, 1);

	return (err < 0) ? err : 0;
	}

	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;
	PDEBUG(D_V4L2, "Set global gain to %d", i2c_data);
	err = po1030_write_sensor(sd, PO1030_REG_GLOBALGAIN,
	&i2c_data, 1);
	return (err < 0) ? err : 0;
	}

	int po1030_get_red_balance(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	err = po1030_read_sensor(sd, PO1030_REG_RED_GAIN,
	&i2c_data, 1);
	*val = i2c_data;
	PDEBUG(D_V4L2, "Read red gain %d", *val);
	return (err < 0) ? err : 0;
	}

	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;
	PDEBUG(D_V4L2, "Set red gain to %d", i2c_data);
	err = po1030_write_sensor(sd, PO1030_REG_RED_GAIN,
	&i2c_data, 1);
	return (err < 0) ? err : 0;
	}

	int po1030_get_blue_balance(struct gspca_dev gspca_dev, __s32 val)
	{
	struct sd sd = (struct sd ) gspca_dev;
	u8 i2c_data;
	int err;

	err = po1030_read_sensor(sd, PO1030_REG_BLUE_GAIN,
	&i2c_data, 1);
	*val = i2c_data;
	PDEBUG(D_V4L2, "Read blue gain %d", *val);

	return (err < 0) ? err : 0;
	}

	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;
	PDEBUG(D_V4L2, "Set blue gain to %d", i2c_data);
	err = po1030_write_sensor(sd, PO1030_REG_BLUE_GAIN,
	&i2c_data, 1);

	return (err < 0) ? err : 0;
	}

	int po1030_power_down(struct sd *sd)
	{
	return 0;
	}

	void po1030_dump_registers(struct sd *sd)
	{
	int address;
	u8 value = 0;

	info("Dumping the po1030 sensor core registers");
	for (address = 0; address < 0x7f; address++) {
	po1030_read_sensor(sd, address, &value, 1);
	info("register 0x%x contains 0x%x",
	address, value);
	}

	info("po1030 register state dump complete");

	info("Probing for which registers that are read/write");
	for (address = 0; address < 0xff; address++) {
	u8 old_value, ctrl_value;
	u8 test_value[2] = {0xff, 0xff};

	po1030_read_sensor(sd, address, &old_value, 1);
	po1030_write_sensor(sd, address, test_value, 1);
	po1030_read_sensor(sd, address, &ctrl_value, 1);

	if (ctrl_value == test_value[0])
	info("register 0x%x is writeable", address);
	else
	info("register 0x%x is read only", address);

	/* Restore original value */
	po1030_write_sensor(sd, address, &old_value, 1);
	}
	}