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Commit 79d11f2a authored by Hans de Goede's avatar Hans de Goede Committed by Jiri Kosina
Browse files

HID: elan: Query device max_x and max_y value from touchpad 



Query the device's max_x and max_y value from the touchpad rather then
hardcoding it. This makes adding support for other USB ids a lot easier.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 314f04e8

drivers/hid/hid-elan.c

+75 −20
Original line number Diff line number Diff line
@@ -27,20 +27,22 @@ 
#define ELAN_MAX_PRESSURE	255

#define ELAN_TP_USB_INTF	1



#define ELAN_FEATURE_REPORT	0x0d

#define ELAN_FEATURE_SIZE	5

#define ELAN_PARAM_MAX_X	6

#define ELAN_PARAM_MAX_Y	7

#define ELAN_PARAM_RES		8



#define ELAN_MUTE_LED_REPORT	0xBC

#define ELAN_LED_REPORT_SIZE	8



struct elan_touchpad_settings {

	u16 max_x;

	u16 max_y;

};



struct elan_drvdata {

	struct input_dev *input;

	u8 prev_report[ELAN_INPUT_REPORT_SIZE];

	struct led_classdev mute_led;

	u8 mute_led_state;

	struct elan_touchpad_settings *settings;

	u16 max_x;

	u16 max_y;

};



static int is_not_elan_touchpad(struct hid_device *hdev)
@@ -65,6 +67,63 @@ static int elan_input_mapping(struct hid_device *hdev, struct hid_input *hi, 
	return 0;

}



static int elan_get_device_param(struct hid_device *hdev,

				 unsigned char *dmabuf, unsigned char param)

{

	int ret;



	dmabuf[0] = ELAN_FEATURE_REPORT;

	dmabuf[1] = 0x05;

	dmabuf[2] = 0x03;

	dmabuf[3] = param;

	dmabuf[4] = 0x01;



	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,

				 ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,

				 HID_REQ_SET_REPORT);

	if (ret != ELAN_FEATURE_SIZE) {

		hid_err(hdev, "Set report error for parm %d: %d\n", param, ret);

		return ret;

	}



	ret = hid_hw_raw_request(hdev, ELAN_FEATURE_REPORT, dmabuf,

				 ELAN_FEATURE_SIZE, HID_FEATURE_REPORT,

				 HID_REQ_GET_REPORT);

	if (ret != ELAN_FEATURE_SIZE) {

		hid_err(hdev, "Get report error for parm %d: %d\n", param, ret);

		return ret;

	}



	return 0;

}



static int elan_get_device_params(struct hid_device *hdev)

{

	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);

	unsigned char *dmabuf;

	int ret;



	dmabuf = kmalloc(ELAN_FEATURE_SIZE, GFP_KERNEL);

	if (!dmabuf)

		return -ENOMEM;



	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_X);

	if (ret)

		goto err;



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



	ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_MAX_Y);

	if (ret)

		goto err;



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



err:

	kfree(dmabuf);

	return ret;

}



static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi)

{

	int ret;
@@ -74,6 +133,10 @@ static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi) 
	if (is_not_elan_touchpad(hdev))

		return 0;



	ret = elan_get_device_params(hdev);

	if (ret)

		return ret;



	input = devm_input_allocate_device(&hdev->dev);

	if (!input)

		return -ENOMEM;
@@ -87,10 +150,10 @@ static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi) 
	input->id.version = hdev->version;

	input->dev.parent = &hdev->dev;



	input_set_abs_params(input, ABS_MT_POSITION_X, 0,

			     drvdata->settings->max_x, 0, 0);

	input_set_abs_params(input, ABS_MT_POSITION_Y, 0,

			     drvdata->settings->max_y, 0, 0);

	input_set_abs_params(input, ABS_MT_POSITION_X, 0, drvdata->max_x,

			     0, 0);

	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, drvdata->max_y,

			     0, 0);

	input_set_abs_params(input, ABS_MT_PRESSURE, 0, ELAN_MAX_PRESSURE,

			     0, 0);
@@ -128,7 +191,7 @@ static void elan_report_mt_slot(struct elan_drvdata *drvdata, u8 *data, 
	input_mt_report_slot_state(input, MT_TOOL_FINGER, active);

	if (active) {

		x = ((data[0] & 0xF0) << 4) | data[1];

		y = drvdata->settings->max_y -

		y = drvdata->max_y -

		    (((data[0] & 0x07) << 8) | data[2]);

		p = data[4];
@@ -339,7 +402,6 @@ static int elan_probe(struct hid_device *hdev, const struct hid_device_id *id) 
	if (!drvdata)

		return -ENOMEM;



	drvdata->settings = (struct elan_touchpad_settings *)id->driver_data;

	hid_set_drvdata(hdev, drvdata);



	ret = hid_parse(hdev);
@@ -382,17 +444,10 @@ static void elan_remove(struct hid_device *hdev) 
	hid_hw_stop(hdev);

}



static const struct elan_touchpad_settings hp_x2_10_touchpad_data = {

	.max_x = 2930,

	.max_y = 1250,

};



static const struct hid_device_id elan_devices[] = {

	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER),

		(kernel_ulong_t)&hp_x2_10_touchpad_data},

	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_HP_X2_10_COVER) },

	{ }

};



MODULE_DEVICE_TABLE(hid, elan_devices);



static struct hid_driver elan_driver = {