> This patch adds files to control si4713 devices.
> Internal functions to control device properties
> and initialization procedures are into these files.
> Also, a v4l2 subdev interface is also exported.
> This way other drivers can use this as v4l2 i2c subdevice.
>
> Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxxxxx>
> ---
> linux/drivers/media/radio/si4713-i2c.c | 2052
> ++++++++++++++++++++++++++++++++
> linux/drivers/media/radio/si4713-i2c.h | 237 ++++
> linux/include/media/si4713.h | 49 +
> 3 files changed, 2338 insertions(+), 0 deletions(-)
> create mode 100644 linux/drivers/media/radio/si4713-i2c.c
> create mode 100644 linux/drivers/media/radio/si4713-i2c.h
> create mode 100644 linux/include/media/si4713.h
>
> diff --git a/linux/drivers/media/radio/si4713-i2c.c
> b/linux/drivers/media/radio/si4713-i2c.c
> new file mode 100644
> index 0000000..adce6e8
> --- /dev/null
> +++ b/linux/drivers/media/radio/si4713-i2c.c
<snip>
> +/* write string property */
> +static int si4713_write_econtrol_string(struct si4713_device *sdev,
> + struct v4l2_ext_control *control)
> +{
> + struct v4l2_queryctrl vqc;
> + char ps_name[MAX_RDS_PS_NAME + 1];
> + char radio_text[MAX_RDS_RADIO_TEXT + 1];
> + int len;
> + s32 rval = 0;
> +
> + len = strlen(control->string);
This is wrong. control->string has not yet been copied to kernelspace.
> + vqc.id = control->id;
> + rval = si4713_queryctrl(&sdev->sd, &vqc);
> + if (rval < 0)
> + goto exit;
> +
> + if (len > vqc.maximum || len % vqc.step) {
> + rval = -ENOSPC;
> + goto exit;
> + }
> +
> + switch (control->id) {
> + case V4L2_CID_RDS_TX_PS_NAME:
> + rval = copy_from_user(ps_name, control->string, len);
> + if (rval < 0)
> + goto exit;
> + ps_name[len] = '\0';
The check should be done here: it's now in kernelspace, and guaranteed to
be zero-terminated.
> + rval = si4713_set_rds_ps_name(sdev, ps_name);
> + break;
> +
> + case V4L2_CID_RDS_TX_RADIO_TEXT:
> + rval = copy_from_user(radio_text, control->string, len);
> + if (rval < 0)
> + goto exit;
> + radio_text[len] = '\0';
> + rval = si4713_set_rds_radio_text(sdev, radio_text);
> + break;
> +
> + default:
> + rval = -EINVAL;
> + break;
> + };
> +
> +exit:
> + return rval;
> +}
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG
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