linux-kernel - Re: [PATCH v3] Input: goodix - Fix touch coords on WinBook TW100 and TW700

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Message-ID: <20150724160958.GB2872@dtor-ws>
Date:	Fri, 24 Jul 2015 09:09:58 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Bastien Nocera <hadess@...ess.net>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Input: goodix - Fix touch coords on WinBook TW100 and
 TW700

On Fri, Jul 24, 2015 at 01:18:14PM +0200, Bastien Nocera wrote:
> The touchscreen on the WinBook TW100 and TW700 don't match the default
> display, with 0,0 touches being reported when touching at the bottom
> right of the screen.
> 
>   1280,800             0,800
>          +-------------+
>          |             |
>          |             |
>          |             |
>          +-------------+
>     1280,0             0,0
> 
> It's unfortunately impossible to detect this problem with data from the
> DSDT, or other auxiliary metadata, so fallback to quirking this specific
> model of tablet instead.
> 
> Signed-off-by: Bastien Nocera <hadess@...ess.net>
> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

Applied, thank you.

> ---
>  drivers/input/touchscreen/goodix.c | 37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
> index b4d12e2..50bf6b1 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -15,6 +15,7 @@
>   */
>  
>  #include <linux/kernel.h>
> +#include <linux/dmi.h>
>  #include <linux/i2c.h>
>  #include <linux/input.h>
>  #include <linux/input/mt.h>
> @@ -34,6 +35,7 @@ struct goodix_ts_data {
>  	int abs_y_max;
>  	unsigned int max_touch_num;
>  	unsigned int int_trigger_type;
> +	bool rotated_screen;
>  };
>  
>  #define GOODIX_MAX_HEIGHT		4096
> @@ -60,6 +62,30 @@ static const unsigned long goodix_irq_flags[] = {
>  	IRQ_TYPE_LEVEL_HIGH,
>  };
>  
> +/*
> + * Those tablets have their coords origin at the bottom right
> + * of the tablet, as if rotated 180 degrees
> + */
> +static const struct dmi_system_id rotated_screen[] = {
> +#if defined(CONFIG_DMI) && defined(CONFIG_X86)
> +	{
> +		.ident = "WinBook TW100",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "TW100")
> +		}
> +	},
> +	{
> +		.ident = "WinBook TW700",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "WinBook"),
> +			DMI_MATCH(DMI_PRODUCT_NAME, "TW700")
> +		},
> +	},
> +#endif
> +	{}
> +};
> +
>  /**
>   * goodix_i2c_read - read data from a register of the i2c slave device.
>   *
> @@ -129,6 +155,11 @@ static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
>  	int input_y = get_unaligned_le16(&coor_data[3]);
>  	int input_w = get_unaligned_le16(&coor_data[5]);
>  
> +	if (ts->rotated_screen) {
> +		input_x = ts->abs_x_max - input_x;
> +		input_y = ts->abs_y_max - input_y;
> +	}
> +
>  	input_mt_slot(ts->input_dev, id);
>  	input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
>  	input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x);
> @@ -223,6 +254,12 @@ static void goodix_read_config(struct goodix_ts_data *ts)
>  		ts->abs_y_max = GOODIX_MAX_HEIGHT;
>  		ts->max_touch_num = GOODIX_MAX_CONTACTS;
>  	}
> +
> +	ts->rotated_screen = dmi_check_system(rotated_screen);
> +	if (ts->rotated_screen) {
> +		dev_dbg(&ts->client->dev,
> +			 "Applying '180 degrees rotated screen' quirk\n");
> +	}
>  }
>  
>  /**
> -- 
> 2.4.3

-- 
Dmitry
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