Adding devicetree folks...
On Wed, Apr 20, 2016 at 08:54:44AM +0200, Dirk Behme wrote:
> From: Knut Wohlrab <Knut.Wohlrab@xxxxxxxxxxxx>
>
> The minimum touch size can be set to support more reliable touch
> detection under difficult conditions (e.g. dust on touch panel surface).
>
> Signed-off-by: Knut Wohlrab <Knut.Wohlrab@xxxxxxxxxxxx>
> Signed-off-by: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx>
> Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
> ---
> .../bindings/input/touchscreen/zforce_ts.txt | 2 ++
> drivers/input/touchscreen/zforce_ts.c | 29 ++++++++++++++++++++++
> include/linux/platform_data/zforce_ts.h | 1 +
> 3 files changed, 32 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt
> index 09ead84..2c5babd 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/zforce_ts.txt
> @@ -13,6 +13,7 @@ Optional properties:
> - vdd-supply: Regulator controlling the controller supply
> - scan-freq-idle: idle scanning frequency in Hz (0 - 65535 Hz; default 10 Hz)
> - scan-freq-finger: touch scanning frequeny in Hz (0 - 65535 Hz; default 50 Hz)
> +- touch-size-min: minimun touch size limit in mm (0 - 255 mm; 0 = no limit (default))
>
> Example:
>
> @@ -32,6 +33,7 @@ Example:
> y-size = <600>;
> scan-freq-idle = <50>;
> scan-freq-finger = <250>;
> + touch-size-min = <5>;
> };
>
> /* ... */
> diff --git a/drivers/input/touchscreen/zforce_ts.c b/drivers/input/touchscreen/zforce_ts.c
> index 51fe2de..fd435fe 100644
> --- a/drivers/input/touchscreen/zforce_ts.c
> +++ b/drivers/input/touchscreen/zforce_ts.c
> @@ -54,6 +54,7 @@
> #define COMMAND_SETCONFIG 0x03
> #define COMMAND_DATAREQUEST 0x04
> #define COMMAND_SCANFREQ 0x08
> +#define COMMAND_TOUCH_SIZE 0x09
> #define COMMAND_STATUS 0X1e
>
> /*
> @@ -65,6 +66,7 @@
> #define RESPONSE_RESOLUTION 0x02
> #define RESPONSE_SETCONFIG 0x03
> #define RESPONSE_SCANFREQ 0x08
> +#define RESPONSE_TOUCH_SIZE 0x09
> #define RESPONSE_STATUS 0X1e
>
> /*
> @@ -276,6 +278,21 @@ static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger,
> return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
> }
>
> +static int zforce_touch_size_limit(struct zforce_ts *ts, u8 limit)
> +{
> + struct i2c_client *client = ts->client;
> + u8 buf[] = { FRAME_START, 5, COMMAND_TOUCH_SIZE,
> + 0, 0, /* maximum size limit off */
> + 1, limit }; /* set minimum size limit */
> +
> + if (!limit)
> + return 0;
> +
> + dev_dbg(&client->dev, "set min. touch size limit to %d mm\n", limit);
> +
> + return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));
> +}
> +
> static int zforce_setconfig(struct zforce_ts *ts, char b1)
> {
> struct i2c_client *client = ts->client;
> @@ -316,6 +333,13 @@ static int zforce_start(struct zforce_ts *ts)
> goto error;
> }
>
> + ret = zforce_touch_size_limit(ts, pdata->touch_size_min);
> + if (ret) {
> + dev_err(&client->dev, "Unable to set min. touch size, %d\n",
> + ret);
> + goto error;
> + }
> +
> ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH);
> if (ret) {
> dev_err(&client->dev, "Unable to set config\n");
> @@ -577,6 +601,7 @@ static irqreturn_t zforce_irq_thread(int irq, void *dev_id)
> case RESPONSE_SETCONFIG:
> case RESPONSE_RESOLUTION:
> case RESPONSE_SCANFREQ:
> + case RESPONSE_TOUCH_SIZE:
> zforce_complete(ts, payload[RESPONSE_ID],
> payload[RESPONSE_DATA]);
> break;
> @@ -852,6 +877,10 @@ static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev)
> &pdata->scan_freq_finger))
> pdata->scan_freq_finger = SCAN_FREQ_DEFAULT_FINGER;
>
> + if (of_property_read_u8(np, "touch-size-min",
> + &pdata->touch_size_min))
> + pdata->touch_size_min = 0;
> +
> return pdata;
> }
>
> diff --git a/include/linux/platform_data/zforce_ts.h b/include/linux/platform_data/zforce_ts.h
> index 90a1181..75e1a49 100644
> --- a/include/linux/platform_data/zforce_ts.h
> +++ b/include/linux/platform_data/zforce_ts.h
> @@ -20,6 +20,7 @@ struct zforce_ts_platdata {
> unsigned int y_max;
> u16 scan_freq_idle;
> u16 scan_freq_finger;
> + u8 touch_size_min;
> };
>
> #endif /* _LINUX_INPUT_ZFORCE_TS_H */
> --
> 2.8.0
>
--
Dmitry
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