Re: [PATCH v5 7/9] Input: atmel_mxt_ts - add support for reference data

Hans Verkuil
2016-06-27T11:11:40Z

On 06/23/2016 12:08 AM, Nick Dyer wrote:
> There are different datatypes available from a maXTouch chip. Add
> support to retrieve reference data as well.
>
> Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
> ---
> drivers/input/touchscreen/atmel_mxt_ts.c | 58 ++++++++++++++++++++++++++++----
> 1 file changed, 51 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> index 739d138..f733785 100644
> --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> @@ -135,6 +135,7 @@ struct t9_range {
> /* MXT_DEBUG_DIAGNOSTIC_T37 */
> #define MXT_DIAGNOSTIC_PAGEUP 0x01
> #define MXT_DIAGNOSTIC_DELTAS 0x10
> +#define MXT_DIAGNOSTIC_REFS 0x11
> #define MXT_DIAGNOSTIC_SIZE 128
>
> #define MXT_FAMILY_1386 160
> @@ -249,6 +250,12 @@ struct mxt_dbg {
> int input;
> };
>
> +enum v4l_dbg_inputs {
> + MXT_V4L_INPUT_DELTAS,
> + MXT_V4L_INPUT_REFS,
> + MXT_V4L_INPUT_MAX,
> +};
> +
> static const struct v4l2_file_operations mxt_video_fops = {
> .owner = THIS_MODULE,
> .open = v4l2_fh_open,
> @@ -2273,6 +2280,7 @@ static void mxt_buffer_queue(struct vb2_buffer *vb)
> struct mxt_data *data = vb2_get_drv_priv(vb->vb2_queue);
> u16 *ptr;
> int ret;
> + u8 mode;
>
> ptr = vb2_plane_vaddr(vb, 0);
> if (!ptr) {
> @@ -2280,7 +2288,18 @@ static void mxt_buffer_queue(struct vb2_buffer *vb)
> goto fault;
> }
>
> - ret = mxt_read_diagnostic_debug(data, MXT_DIAGNOSTIC_DELTAS, ptr);
> + switch (data->dbg.input) {
> + case MXT_V4L_INPUT_DELTAS:
> + default:
> + mode = MXT_DIAGNOSTIC_DELTAS;
> + break;
> +
> + case MXT_V4L_INPUT_REFS:
> + mode = MXT_DIAGNOSTIC_REFS;
> + break;
> + }
> +
> + ret = mxt_read_diagnostic_debug(data, mode, ptr);
> if (ret)
> goto fault;
>
> @@ -2325,11 +2344,20 @@ static int mxt_vidioc_querycap(struct file *file, void *priv,
> static int mxt_vidioc_enum_input(struct file *file, void *priv,
> struct v4l2_input *i)
> {
> - if (i->index > 0)
> + if (i->index >= MXT_V4L_INPUT_MAX)
> return -EINVAL;
>
> i->type = V4L2_INPUT_TYPE_TOUCH;
> - strlcpy(i->name, "Mutual References", sizeof(i->name));
> +
> + switch (i->index) {
> + case MXT_V4L_INPUT_REFS:
> + strlcpy(i->name, "Mutual References", sizeof(i->name));
> + break;
> + case MXT_V4L_INPUT_DELTAS:
> + strlcpy(i->name, "Mutual Deltas", sizeof(i->name));

Same here: Mutual Capacitance Deltas

> + break;
> + }
> +
> return 0;
> }
>
> @@ -2337,12 +2365,16 @@ static int mxt_set_input(struct mxt_data *data, unsigned int i)
> {
> struct v4l2_pix_format *f = &data->dbg.format;
>
> - if (i > 0)
> + if (i >= MXT_V4L_INPUT_MAX)
> return -EINVAL;
>
> + if (i == MXT_V4L_INPUT_DELTAS)
> + f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
> + else
> + f->pixelformat = V4L2_TCH_FMT_TU16;
> +
> f->width = data->xy_switch ? data->ysize : data->xsize;
> f->height = data->xy_switch ? data->xsize : data->ysize;
> - f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
> f->field = V4L2_FIELD_NONE;
> f->colorspace = V4L2_COLORSPACE_RAW;
> f->bytesperline = f->width * sizeof(u16);
> @@ -2380,10 +2412,22 @@ static int mxt_vidioc_fmt(struct file *file, void *priv, struct v4l2_format *f)
> static int mxt_vidioc_enum_fmt(struct file *file, void *priv,
> struct v4l2_fmtdesc *fmt)
> {
> - if (fmt->index > 0 || fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + switch (fmt->index) {
> + case 0:
> + fmt->pixelformat = V4L2_TCH_FMT_TU16;
> + break;
> +
> + case 1:
> + fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
> + break;
> +
> + default:
> return -EINVAL;
> + }
>
> - fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
> return 0;
> }
>
>

Regards,

Hans