Commit 19588bee authored by Hans de Goede's avatar Hans de Goede Committed by Jiri Kosina
Browse files

HID: elan: Query resolution from the touchpad 



Query the resolution from the touchpad and report it to userspace

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 79d11f2a

drivers/hid/hid-elan.c

+21 −0
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ struct elan_drvdata { 
	u8 mute_led_state;

	u16 max_x;

	u16 max_y;

	u16 res_x;

	u16 res_y;

};



static int is_not_elan_touchpad(struct hid_device *hdev)
@@ -97,6 +99,15 @@ static int elan_get_device_param(struct hid_device *hdev, 
	return 0;

}



static unsigned int elan_convert_res(char val)

{

	/*

	 * (value from firmware) * 10 + 790 = dpi

	 * dpi * 10 / 254 = dots/mm

	 */

	return (val * 10 + 790) * 10 / 254;

}



static int elan_get_device_params(struct hid_device *hdev)

{

	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);
@@ -119,6 +130,13 @@ static int elan_get_device_params(struct hid_device *hdev) 


	drvdata->max_y = (dmabuf[4] << 8) | dmabuf[3];



	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_RES);

	if (ret)

		goto err;



	drvdata->res_x = elan_convert_res(dmabuf[3]);

	drvdata->res_y = elan_convert_res(dmabuf[4]);



err:

	kfree(dmabuf);

	return ret;
@@ -166,6 +184,9 @@ static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi) 
		return ret;

	}



	input_abs_set_res(input, ABS_X, drvdata->res_x);

	input_abs_set_res(input, ABS_Y, drvdata->res_y);



	ret = input_register_device(input);

	if (ret) {

		hid_err(hdev, "Failed to register elan input device: %d\n",