HID: added support for the Cando dual touch panel (36213e1e) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/hid/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -86,6 +86,12 @@ config HID_BELKIN
		---help---
		Support for Belkin Flip KVM and Wireless keyboard.

		config HID_CANDO
		tristate "Cando dual touch panel"
		depends on USB_HID
		---help---
		Support for Cando dual touch panel.

		config HID_CHERRY
		tristate "Cherry" if EMBEDDED
		depends on USB_HID

drivers/hid/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ obj-$(CONFIG_HID_3M_PCT) += hid-3m-pct.o
		obj-$(CONFIG_HID_A4TECH) += hid-a4tech.o
		obj-$(CONFIG_HID_APPLE) += hid-apple.o
		obj-$(CONFIG_HID_BELKIN) += hid-belkin.o
		obj-$(CONFIG_HID_CANDO) += hid-cando.o
		obj-$(CONFIG_HID_CHERRY) += hid-cherry.o
		obj-$(CONFIG_HID_CHICONY) += hid-chicony.o
		obj-$(CONFIG_HID_CYPRESS) += hid-cypress.o

drivers/hid/hid-cando.c

0 → 100644

+267 −0

Original line number	Diff line number	Diff line
		/*
		* HID driver for Cando dual-touch panels
		*
		* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
		*
		*/

		/*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License as published by the Free
		* Software Foundation; either version 2 of the License, or (at your option)
		* any later version.
		*/

		#include <linux/device.h>
		#include <linux/hid.h>
		#include <linux/module.h>
		#include <linux/slab.h>

		MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
		MODULE_DESCRIPTION("Cando dual-touch panel");
		MODULE_LICENSE("GPL");

		#include "hid-ids.h"

		struct cando_data {
		__u16 x, y;
		__u8 id;
		__s8 oldest; /* id of the oldest finger in previous frame */
		bool valid; /* valid finger data, or just placeholder? */
		bool first; /* is this the first finger in this frame? */
		__s8 firstid; /* id of the first finger in the frame */
		__u16 firstx, firsty; /* (x, y) of the first finger in the frame */
		};

		static int cando_input_mapping(struct hid_device hdev, struct hid_input hi,
		struct hid_field field, struct hid_usage usage,
		unsigned long *bit, int max)
		{
		switch (usage->hid & HID_USAGE_PAGE) {

		case HID_UP_GENDESK:
		switch (usage->hid) {
		case HID_GD_X:
		hid_map_usage(hi, usage, bit, max,
		EV_ABS, ABS_MT_POSITION_X);
		/* touchscreen emulation */
		input_set_abs_params(hi->input, ABS_X,
		field->logical_minimum,
		field->logical_maximum, 0, 0);
		return 1;
		case HID_GD_Y:
		hid_map_usage(hi, usage, bit, max,
		EV_ABS, ABS_MT_POSITION_Y);
		/* touchscreen emulation */
		input_set_abs_params(hi->input, ABS_Y,
		field->logical_minimum,
		field->logical_maximum, 0, 0);
		return 1;
		}
		return 0;

		case HID_UP_DIGITIZER:
		switch (usage->hid) {
		case HID_DG_TIPSWITCH:
		case HID_DG_CONTACTMAX:
		return -1;
		case HID_DG_INRANGE:
		/* touchscreen emulation */
		hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
		return 1;
		case HID_DG_CONTACTID:
		hid_map_usage(hi, usage, bit, max,
		EV_ABS, ABS_MT_TRACKING_ID);
		return 1;
		}
		return 0;
		}

		return 0;
		}

		static int cando_input_mapped(struct hid_device hdev, struct hid_input hi,
		struct hid_field field, struct hid_usage usage,
		unsigned long *bit, int max)
		{
		if (usage->type == EV_KEY \|\| usage->type == EV_ABS)
		clear_bit(usage->code, *bit);

		return 0;
		}

		/*
		* this function is called when a whole finger has been parsed,
		* so that it can decide what to send to the input layer.
		*/
		static void cando_filter_event(struct cando_data td, struct input_dev input)
		{
		td->first = !td->first; /* touchscreen emulation */

		if (!td->valid) {
		/*
		* touchscreen emulation: if this is the second finger and
		* the first was valid, the first was the oldest; if the
		* first was not valid and there was a valid finger in the
		* previous frame, this is a release.
		*/
		if (td->first) {
		td->firstid = -1;
		} else if (td->firstid >= 0) {
		input_event(input, EV_ABS, ABS_X, td->firstx);
		input_event(input, EV_ABS, ABS_Y, td->firsty);
		td->oldest = td->firstid;
		} else if (td->oldest >= 0) {
		input_event(input, EV_KEY, BTN_TOUCH, 0);
		td->oldest = -1;
		}

		return;
		}

		input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
		input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
		input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);

		input_mt_sync(input);

		/*
		* touchscreen emulation: if there was no touching finger previously,
		* emit touch event
		*/
		if (td->oldest < 0) {
		input_event(input, EV_KEY, BTN_TOUCH, 1);
		td->oldest = td->id;
		}

		/*
		* touchscreen emulation: if this is the first finger, wait for the
		* second; the oldest is then the second if it was the oldest already
		* or if there was no first, the first otherwise.
		*/
		if (td->first) {
		td->firstx = td->x;
		td->firsty = td->y;
		td->firstid = td->id;
		} else {
		int x, y, oldest;
		if (td->id == td->oldest \|\| td->firstid < 0) {
		x = td->x;
		y = td->y;
		oldest = td->id;
		} else {
		x = td->firstx;
		y = td->firsty;
		oldest = td->firstid;
		}
		input_event(input, EV_ABS, ABS_X, x);
		input_event(input, EV_ABS, ABS_Y, y);
		td->oldest = oldest;
		}
		}


		static int cando_event(struct hid_device hid, struct hid_field field,
		struct hid_usage *usage, __s32 value)
		{
		struct cando_data *td = hid_get_drvdata(hid);

		if (hid->claimed & HID_CLAIMED_INPUT) {
		struct input_dev *input = field->hidinput->input;

		switch (usage->hid) {
		case HID_DG_INRANGE:
		td->valid = value;
		break;
		case HID_DG_CONTACTID:
		td->id = value;
		break;
		case HID_GD_X:
		td->x = value;
		break;
		case HID_GD_Y:
		td->y = value;
		cando_filter_event(td, input);
		break;
		case HID_DG_TIPSWITCH:
		/* avoid interference from generic hidinput handling */
		break;

		default:
		/* fallback to the generic hidinput handling */
		return 0;
		}
		}

		/* we have handled the hidinput part, now remains hiddev */
		if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
		hid->hiddev_hid_event(hid, field, usage, value);

		return 1;
		}

		static int cando_probe(struct hid_device hdev, const struct hid_device_id id)
		{
		int ret;
		struct cando_data *td;

		td = kmalloc(sizeof(struct cando_data), GFP_KERNEL);
		if (!td) {
		dev_err(&hdev->dev, "cannot allocate Cando Touch data\n");
		return -ENOMEM;
		}
		hid_set_drvdata(hdev, td);

		ret = hid_parse(hdev);
		if (!ret)
		ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

		if (ret)
		kfree(td);

		return ret;
		}

		static void cando_remove(struct hid_device *hdev)
		{
		hid_hw_stop(hdev);
		kfree(hid_get_drvdata(hdev));
		hid_set_drvdata(hdev, NULL);
		}

		static const struct hid_device_id cando_devices[] = {
		{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO,
		USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
		{ }
		};
		MODULE_DEVICE_TABLE(hid, cando_devices);

		static const struct hid_usage_id cando_grabbed_usages[] = {
		{ HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
		{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
		};

		static struct hid_driver cando_driver = {
		.name = "cando-touch",
		.id_table = cando_devices,
		.probe = cando_probe,
		.remove = cando_remove,
		.input_mapping = cando_input_mapping,
		.input_mapped = cando_input_mapped,
		.usage_table = cando_grabbed_usages,
		.event = cando_event,
		};

		static int __init cando_init(void)
		{
		return hid_register_driver(&cando_driver);
		}

		static void __exit cando_exit(void)
		{
		hid_unregister_driver(&cando_driver);
		}

		module_init(cando_init);
		module_exit(cando_exit);

drivers/hid/hid-core.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1295,6 +1295,7 @@ static const struct hid_device_id hid_blacklist[] = {
		{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_FOUNTAIN_TP_ONLY) },
		{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER1_TP_ONLY) },
		{ HID_USB_DEVICE(USB_VENDOR_ID_BELKIN, USB_DEVICE_ID_FLIP_KVM) },
		{ HID_USB_DEVICE(USB_VENDOR_ID_CANDO, USB_DEVICE_ID_CANDO_MULTI_TOUCH) },
		{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
		{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
		{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1) },

drivers/hid/hid-ids.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -123,6 +123,9 @@
		#define USB_VENDOR_ID_BERKSHIRE 0x0c98
		#define USB_DEVICE_ID_BERKSHIRE_PCWD 0x1140

		#define USB_VENDOR_ID_CANDO 0x2087
		#define USB_DEVICE_ID_CANDO_MULTI_TOUCH 0x0a01

		#define USB_VENDOR_ID_CH 0x068e
		#define USB_DEVICE_ID_CH_PRO_PEDALS 0x00f2
		#define USB_DEVICE_ID_CH_COMBATSTICK 0x00f4