Hi Ben,
Thanks for the update! I've applied the patch, but please see the comments
below.
On Tue, Jan 15, 2019 at 04:30:29PM +0800, Ben Kao wrote:
...
> +static int ov8856_read_reg(struct ov8856 *ov8856, u16 reg, u16 len, u32 *val)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
> + struct i2c_msg msgs[2];
> + u8 addr_buf[2] = {reg >> 8, reg & 0xff};
You could use put_unaligned_be16() for doing this, as you do below.
> + u8 data_buf[4] = {0, };
> + int ret;
> +
> + if (len > 4)
> + return -EINVAL;
> +
> + msgs[0].addr = client->addr;
> + msgs[0].flags = 0;
> + msgs[0].len = ARRAY_SIZE(addr_buf);
sizeof() would be better suited for the purpose: the length is in bytes.
Could you send a follow-up patch on top of this one?
> + msgs[0].buf = addr_buf;
> + msgs[1].addr = client->addr;
> + msgs[1].flags = I2C_M_RD;
> + msgs[1].len = len;
> + msgs[1].buf = &data_buf[4 - len];
> +
> + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> + if (ret != ARRAY_SIZE(msgs))
> + return -EIO;
> +
> + *val = get_unaligned_be32(data_buf);
> +
> + return 0;
> +}
--
Regards,
Sakari Ailus
sakari.ailus@xxxxxxxxxxxxxxx
