/*
* Driver for the ov7660 sensor
*
* Copyright (C) 2009 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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include "m5602_ov7660.h"
static int ov7660_s_ctrl(struct v4l2_ctrl *ctrl);
static void ov7660_dump_registers(struct sd *sd);
static struct v4l2_pix_format ov7660_modes[] = {
{
640,
480,
V4L2_PIX_FMT_SBGGR8,
V4L2_FIELD_NONE,
.sizeimage =
640 * 480,
.bytesperline = 640,
.colorspace = V4L2_COLORSPACE_SRGB,
.priv = 0
}
};
static const struct v4l2_ctrl_ops ov7660_ctrl_ops = {
.s_ctrl = ov7660_s_ctrl,
};
int ov7660_probe(struct sd *sd)
{
int err = 0, i;
u8 prod_id = 0, ver_id = 0;
if (force_sensor) {
if (force_sensor == OV7660_SENSOR) {
pr_info("Forcing an %s sensor\n", ov7660.name);
goto sensor_found;
}
/* If we want to force another sensor,
don't try to probe this one */
return -ENODEV;
}
/* Do the preinit */
for (i = 0; i < ARRAY_SIZE(preinit_ov7660) && !err; i++) {
u8 data[2];
if (preinit_ov7660[i][0] == BRIDGE) {
err = m5602_write_bridge(sd,
preinit_ov7660[i][1],
preinit_ov7660[i][2]);
} else {
data[0] = preinit_ov7660[i][2];
err = m5602_write_sensor(sd,
preinit_ov7660[i][1], data, 1);
}
}
if (err < 0)
return err;
if (m5602_read_sensor(sd, OV7660_PID, &prod_id, 1))
return -ENODEV;
if (m5602_read_sensor(sd, OV7660_VER, &ver_id, 1))
return -ENODEV;
pr_info("Sensor reported 0x%x%x\n", prod_id, ver_id);
if ((prod_id == 0x76) && (ver_id == 0x60)) {
pr_info("Detected a ov7660 sensor\n");
goto sensor_found;
}
return -ENODEV;
sensor_found:
sd->gspca_dev.cam.cam_mode = ov7660_modes;
sd->gspca_dev.cam.nmodes = ARRAY_SIZE(ov7660_modes);
return 0;
}
int ov7660_init(struct sd *sd)
{
int i, err;
/* Init the sensor */
for (i = 0; i < ARRAY_SIZE(init_ov7660); i++) {
u8 data[2];
if (init_ov7660[i][0] == BRIDGE) {
err = m5602_write_bridge(sd,
init_ov7660[i][1],
init_ov7660[i][2]);
} else {
data[0] = init_ov7660[i][2];
err = m5602_write_sensor(sd,
init_ov7660[i][1], data, 1);
}
if (err < 0)
return err;
}
if (dump_sensor)
ov7660_dump_registers(sd);
return 0;
}
int ov7660_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, 6);
v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_AUTO_WHITE_BALANCE,
0, 1, 1, 1);
v4l2_ctrl_new_std_menu(hdl, &ov7660_ctrl_ops,
V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_AUTO);
sd->autogain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops,
V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
sd->gain = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_GAIN, 0,
255, 1, OV7660_DEFAULT_GAIN);
sd->hflip = v4l2_ctrl_new_std(hdl, &ov7660_ctrl_ops, V4L2_CID_HFLIP,
0, 1, 1, 0);
sd->vflip = v4l2_ctrl_new_std(hdl, &ov7660_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(2, &sd->autogain, 0, false);
v4l2_ctrl_cluster(2, &sd->hflip);
return 0;
}
int ov7660_start(struct sd *sd)
{
return 0;
}
int ov7660_stop(struct sd *sd)
{
return 0;
}
void ov7660_disconnect(struct sd *sd)
{
ov7660_stop(sd);
sd->sensor = NULL;
}
static int ov7660_set_gain(struct gspca_dev *gspca_dev, __s32 val)
{
int err;
u8 i2c_data = val;
struct sd *sd = (struct sd *) gspca_dev;
PDEBUG(D_CONF, "Setting gain to %d", val);
err = m5602_write_sensor(sd, OV7660_GAIN, &i2c_data, 1);
return err;
}
static int ov7660_set_auto_white_balance(struct gspca_dev *gspca_dev,
__s32 val)
{
int err;
u8 i2c_data;
struct sd *sd = (struct sd *) gspca_dev;
PDEBUG(D_CONF, "Set auto white balance to %d", val);
err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
if (err < 0)
return err;
i2c_data = ((i2c_data & 0xfd) | ((val & 0x01) << 1));
err = m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
return err;
}
static int ov7660_set_auto_gain(struct gspca_dev *gspca_dev, __s32 val)
{
int err;
u8 i2c_data;
struct sd *sd = (struct sd *) gspca_dev;
PDEBUG(D_CONF, "Set auto gain control to %d", val);
err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
if (err < 0)
return err;
i2c_data = ((i2c_data & 0xfb) | ((val & 0x01) << 2));
return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
}
static int ov7660_set_auto_exposure(struct gspca_dev *gspca_dev,
__s32 val)
{
int err;
u8 i2c_data;
struct sd *sd = (struct sd *) gspca_dev;
PDEBUG(D_CONF, "Set auto exposure control to %d", val);
err = m5602_read_sensor(sd, OV7660_COM8, &i2c_data, 1);
if (err < 0)
return err;
val = (val == V4L2_EXPOSURE_AUTO);
i2c_data = ((i2c_data & 0xfe) | ((val & 0x01) << 0));
return m5602_write_sensor(sd, OV7660_COM8, &i2c_data, 1);
}
static int ov7660_set_hvflip(struct gspca_dev *gspca_dev)
{
int err;
u8 i2c_data;
struct sd *sd = (struct sd *) gspca_dev;
PDEBUG(D_CONF, "Set hvflip to %d, %d", sd->hflip->val, sd->vflip->val);
i2c_data = (sd->hflip->val << 5) | (sd->vflip->val << 4);
err = m5602_write_sensor(sd, OV7660_MVFP, &i2c_data, 1);
return err;
}
static int ov7660_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 = ov7660_set_auto_white_balance(gspca_dev, ctrl->val);
break;
case V4L2_CID_EXPOSURE_AUTO:
err = ov7660_set_auto_exposure(gspca_dev, ctrl->val);
break;
case V4L2_CID_AUTOGAIN:
err = ov7660_set_auto_gain(gspca_dev, ctrl->val);
if (err || ctrl->val)
return err;
err = ov7660_set_gain(gspca_dev, sd->gain->val);
break;
case V4L2_CID_HFLIP:
err = ov7660_set_hvflip(gspca_dev);
break;
default:
return -EINVAL;
}
return err;
}
static void ov7660_dump_registers(struct sd *sd)
{
int address;
pr_info("Dumping the ov7660 register state\n");
for (address = 0; address < 0xa9; address++) {
u8 value;
m5602_read_sensor(sd, address, &value, 1);
pr_info("register 0x%x contains 0x%x\n", address, value);
}
pr_info("ov7660 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);
}
}