index : linux	frominto-error master
	Contrib clone of linux	matthias

summaryrefslogtreecommitdiffstats

log msg author committer range

path: root/fs/fs_struct.c

Age	Commit message (Expand)	Author
2009-03-31	Get rid of indirect include of fs_struct.h	Al Viro
2009-03-31	New helper - current_umask()	Al Viro
2009-03-31	New locking/refcounting for fs_struct	Al Viro
2009-03-31	Take fs_struct handling to new file (fs/fs_struct.c)	Al Viro

generated by cgit v1.2.3 (git 2.25.1) at 2024-09-08 04:13:20 +0000

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * HID Driver for ELAN Touchpad
 *
 * Currently only supports touchpad found on HP Pavilion X2 10
 *
 * Copyright (c) 2016 Alexandrov Stanislav <neko@nya.ai>
 */

#include <linux/hid.h>
#include <linux/input/mt.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "hid-ids.h"

#define ELAN_MT_I2C		0x5d
#define ELAN_SINGLE_FINGER	0x81
#define ELAN_MT_FIRST_FINGER	0x82
#define ELAN_MT_SECOND_FINGER	0x83
#define ELAN_INPUT_REPORT_SIZE	8
#define ELAN_I2C_REPORT_SIZE	32
#define ELAN_FINGER_DATA_LEN	5
#define ELAN_MAX_FINGERS	5
#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

#define ELAN_HAS_LED		BIT(0)

struct elan_drvdata {
	struct input_dev *input;
	u8 prev_report[ELAN_INPUT_REPORT_SIZE];
	struct led_classdev mute_led;
	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)
{
	if (hdev->bus == BUS_USB) {
		struct usb_interface *intf = to_usb_interface(hdev->dev.parent);

		return (intf->altsetting->desc.bInterfaceNumber !=
			ELAN_TP_USB_INTF);
	}

	return 0;
}

static int elan_input_mapping(struct hid_device *hdev, struct hid_input *hi,
			      struct hid_field *field, struct hid_usage *usage,
			      unsigned long **bit, int *max)
{
	if (is_not_elan_touchpad(hdev))
		return 0;

	if (field->report->id == ELAN_SINGLE_FINGER ||
	    field->report->id == ELAN_MT_FIRST_FINGER ||
	    field->report->id == ELAN_MT_SECOND_FINGER ||
	    field->report->id == ELAN_MT_I2C)
		return -1;

	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 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);
	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];

	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;
}

static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi)
{
	int ret;
	struct input_dev *input;
	struct elan_drvdata *drvdata = hid_get_drvdata(hdev);

	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;

	input->name = "Elan Touchpad";
	input->phys = hdev->phys;
	input->uniq = hdev->uniq;
	input->id.bustype = hdev->bus;
	input->id.vendor  = hdev->vendor;
	input->id.product = hdev->product;
	input->id.version = hdev->version;
	input->dev.parent = &hdev->dev;

	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);

	__set_bit(BTN_LEFT, input->keybit);
	__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);

	ret = input_mt_init_slots(input, ELAN_MAX_FINGERS, INPUT_MT_POINTER);
	if (ret) {
		hid_err(hdev, "Failed to init elan MT slots: %d\n", ret);
		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",
			ret);
		input_free_device(input);
		return ret;
	}

	drvdata->input = input;

	return 0;
}

static void elan_report_mt_slot(struct elan_drvdata *drvdata, u8 *data,
				unsigned int slot_num)
{
	struct input_dev *input = drvdata->input;
	int x, y, p;

	bool active = !!data;

	input_mt_slot(input, slot_num);
	input_mt_report_slot_state(input, MT_TOOL_FINGER, active);
	if (active) {
		x = ((data[0] & 0xF0) << 4) | data[1];
		y = drvdata->max_y -
		    (((data[0] & 0x07) << 8) | data[2]);
		p = data[4];

		input_report_abs(input, ABS_MT_POSITION_X, x);
		input_report_abs(input, ABS_MT_POSITION_Y, y);
		input_report_abs(input, ABS_MT_PRESSURE, p);
	}
}

static void elan_usb_report_input(struct elan_drvdata *drvdata, u8 *data)
{
	int