static int ov9640_video_probe(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
struct ov9640_priv *priv = to_ov9640_sensor(sd);
u8 pid, ver, midh, midl;
const char *devname;
int ret;
ret = ov9640_s_power(&priv->subdev, 1);
if (ret < 0)
return ret;
/*
* check and show product ID and manufacturer ID
*/
ret = ov9640_reg_read(client, OV9640_PID, &pid);
if (!ret)
ret = ov9640_reg_read(client, OV9640_VER, &ver);
if (!ret)
ret = ov9640_reg_read(client, OV9640_MIDH, &midh);
if (!ret)
ret = ov9640_reg_read(client, OV9640_MIDL, &midl);
if (ret)
goto done;
switch (VERSION(pid, ver)) {
case OV9640_V2:
devname = "ov9640";
priv->model = V4L2_IDENT_OV9640;
priv->revision = 2;
break;
case OV9640_V3:
devname = "ov9640";
priv->model = V4L2_IDENT_OV9640;
priv->revision = 3;
break;
default:
dev_err(&client->dev, "Product ID error %x:%x\n", pid, ver);
ret = -ENODEV;
goto done;
}
dev_info(&client->dev, "%s Product ID %0x:%0x Manufacturer ID %x:%x\n",
devname, pid, ver, midh, midl);
ret = v4l2_ctrl_handler_setup(&priv->hdl);
done:
ov9640_s_power(&priv->subdev, 0);
return ret;
}
static int ov9640_get_register(struct v4l2_subdev *sd,
struct v4l2_dbg_register *reg)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
int ret;
u8 val;
if (reg->reg & ~0xff)
return -EINVAL;
reg->size = 1;
ret = ov9640_reg_read(client, reg->reg, &val);
if (ret)
return ret;
reg->val = (__u64)val;
return 0;
}
/* read a register */
static int ov9640_reg_read(struct i2c_client *client, u8 reg, u8 *val)
{
int ret;
u8 data = reg;
struct i2c_msg msg = {
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = &data,
};
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0)
goto err;
msg.flags = I2C_M_RD;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0)
goto err;
*val = data;
return 0;
err:
dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
return ret;
}
/* write a register */
static int ov9640_reg_write(struct i2c_client *client, u8 reg, u8 val)
{
int ret;
u8 _val;
unsigned char data[2] = { reg, val };
struct i2c_msg msg = {
.addr = client->addr,
.flags = 0,
.len = 2,
.buf = data,
};
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0) {
dev_err(&client->dev, "Failed writing register 0x%02x!\n", reg);
return ret;
}
/* we have to read the register back ... no idea why, maybe HW bug */
ret = ov9640_reg_read(client, reg, &_val);
if (ret)
dev_err(&client->dev,
"Failed reading back register 0x%02x!\n", reg);
return 0;
}
/* Read a register, alter its bits, write it back */
static int ov9640_reg_rmw(struct i2c_client *client, u8 reg, u8 set, u8 unset)
{
u8 val;
int ret;
ret = ov9640_reg_read(client, reg, &val);
if (ret) {
dev_err(&client->dev,
"[Read]-Modify-Write of register %02x failed!\n", reg);
return val;
}
val |= set;
val &= ~unset;
ret = ov9640_reg_write(client, reg, val);
if (ret)
dev_err(&client->dev,
"Read-Modify-[Write] of register %02x failed!\n", reg);
return ret;
}