joystick.c

/*


https://github.com/torvalds/linux/blob/master/drivers/hid/usbhid/usbmouse.c
https://github.com/mavam/ml-driver
https://github.com/smalinux/mouse-driver

https://elixir.bootlin.com/linux/latest/source/include/linux/usb.h
https://elixir.bootlin.com/linux/latest/source/drivers/usb/usb-skeleton.c















*/



// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  USB HIDBP Mouse support
 */

/*
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb/input.h>
#include <linux/hid.h>

/*
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *  Copyright (c) 2006 Jiri Kosina
 */

/*
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/input.h>

/*  API provided by hid-core.c for USB HID drivers */
void usbhid_init_reports(struct hid_device *hid);
struct usb_interface *usbhid_find_interface(int minor);

/* iofl flags */
#define HID_CTRL_RUNNING	1
#define HID_OUT_RUNNING		2
#define HID_IN_RUNNING		3
#define HID_RESET_PENDING	4
#define HID_SUSPENDED		5
#define HID_CLEAR_HALT		6
#define HID_DISCONNECTED	7
#define HID_STARTED		8
#define HID_KEYS_PRESSED	10
#define HID_NO_BANDWIDTH	11
#define HID_RESUME_RUNNING	12
/*
 * The device is opened, meaning there is a client that is interested
 * in data coming from the device.
 */
#define HID_OPENED		13
/*
 * We are polling input endpoint by [re]submitting IN URB, because
 * either HID device is opened or ALWAYS POLL quirk is set for the
 * device.
 */
#define HID_IN_POLLING		14

/*
 * USB-specific HID struct, to be pointed to
 * from struct hid_device->driver_data
 */

struct usbhid_device {
	struct hid_device *hid;						/* pointer to corresponding HID dev */

	struct usb_interface *intf;                                     /* USB interface */
	int ifnum;                                                      /* USB interface number */

	unsigned int bufsize;                                           /* URB buffer size */

	struct urb *urbin;                                              /* Input URB */
	char *inbuf;                                                    /* Input buffer */
	dma_addr_t inbuf_dma;                                           /* Input buffer dma */

	struct urb *urbctrl;                                            /* Control URB */
	struct usb_ctrlrequest *cr;                                     /* Control request struct */
	struct hid_control_fifo ctrl[HID_CONTROL_FIFO_SIZE];  		/* Control fifo */
	unsigned char ctrlhead, ctrltail;                               /* Control fifo head & tail */
	char *ctrlbuf;                                                  /* Control buffer */
	dma_addr_t ctrlbuf_dma;                                         /* Control buffer dma */
	unsigned long last_ctrl;						/* record of last output for timeouts */

	struct urb *urbout;                                             /* Output URB */
	struct hid_output_fifo out[HID_CONTROL_FIFO_SIZE];              /* Output pipe fifo */
	unsigned char outhead, outtail;                                 /* Output pipe fifo head & tail */
	char *outbuf;                                                   /* Output buffer */
	dma_addr_t outbuf_dma;                                          /* Output buffer dma */
	unsigned long last_out;							/* record of last output for timeouts */

	struct mutex mutex;						/* start/stop/open/close */
	spinlock_t lock;						/* fifo spinlock */
	unsigned long iofl;                                             /* I/O flags (CTRL_RUNNING, OUT_RUNNING) */
	struct timer_list io_retry;                                     /* Retry timer */
	unsigned long stop_retry;                                       /* Time to give up, in jiffies */
	unsigned int retry_delay;                                       /* Delay length in ms */
	struct work_struct reset_work;                                  /* Task context for resets */
	wait_queue_head_t wait;						/* For sleeping */
};

#define	hid_to_usb_dev(hid_dev) \
	to_usb_device(hid_dev->dev.parent->parent)

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.6"
#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
#define DRIVER_DESC "USB HID Boot Protocol mouse driver"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

struct usb_mouse {
	char name[128];
	char phys[64];
	struct usb_device *usbdev;
	struct input_dev *dev;
	struct urb *irq;

	signed char *data;
	dma_addr_t data_dma;
};

static void usb_mouse_irq(struct urb *urb)
{
	printk("KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK\n");
	struct usb_mouse *mouse = urb->context;
	signed char *data = mouse->data;
	struct input_dev *dev = mouse->dev;
	int status;

	switch (urb->status) {
	case 0:			/* success */
		break;
	case -ECONNRESET:	/* unlink */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	/* -EPIPE:  should clear the halt */
	default:		/* error */
		goto resubmit;
	}

	input_report_key(dev, BTN_LEFT,   data[0] & 0x01);
	input_report_key(dev, BTN_RIGHT,  data[0] & 0x02);
	input_report_key(dev, BTN_MIDDLE, data[0] & 0x04);
	input_report_key(dev, BTN_SIDE,   data[0] & 0x08);
	input_report_key(dev, BTN_EXTRA,  data[0] & 0x10);

	input_report_rel(dev, REL_X,     data[1]);
	input_report_rel(dev, REL_Y,     data[2]);
	input_report_rel(dev, REL_WHEEL, data[3]);

	input_sync(dev);
resubmit:
	status = usb_submit_urb (urb, GFP_ATOMIC);
	if (status)
		dev_err(&mouse->usbdev->dev,
			"can't resubmit intr, %s-%s/input0, status %d\n",
			mouse->usbdev->bus->bus_name,
			mouse->usbdev->devpath, status);
}

static int usb_mouse_open(struct input_dev *dev)
{
	printk("KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK\n");
	struct usb_mouse *mouse = input_get_drvdata(dev);

	mouse->irq->dev = mouse->usbdev;
	if (usb_submit_urb(mouse->irq, GFP_KERNEL))
		return -EIO;

	return 0;
}

static void usb_mouse_close(struct input_dev *dev)
{
	printk("KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK\n");
	struct usb_mouse *mouse = input_get_drvdata(dev);

	usb_kill_urb(mouse->irq);
}

static int usb_mouse_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	struct usb_host_interface *interface;
	struct usb_endpoint_descriptor *endpoint;
	struct usb_mouse *mouse;
	struct input_dev *input_dev;
	int pipe, maxp;
	int error = -ENOMEM;

	interface = intf->cur_altsetting;

	if (interface->desc.bNumEndpoints != 1)
		return -ENODEV;

	endpoint = &interface->endpoint[0].desc;
	if (!usb_endpoint_is_int_in(endpoint))
		return -ENODEV;

	pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
	maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));

	mouse = kzalloc(sizeof(struct usb_mouse), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!mouse || !input_dev)
		goto fail1;

	mouse->data = usb_alloc_coherent(dev, 8, GFP_ATOMIC, &mouse->data_dma);
	if (!mouse->data)
		goto fail1;

	mouse->irq = usb_alloc_urb(0, GFP_KERNEL);
	if (!mouse->irq)
		goto fail2;

	mouse->usbdev = dev;
	mouse->dev = input_dev;

	if (dev->manufacturer)
		strlcpy(mouse->name, dev->manufacturer, sizeof(mouse->name));

	if (dev->product) {
		if (dev->manufacturer)
			strlcat(mouse->name, " ", sizeof(mouse->name));
		strlcat(mouse->name, dev->product, sizeof(mouse->name));
	}

	if (!strlen(mouse->name))
		snprintf(mouse->name, sizeof(mouse->name),
			 "USB HIDBP Mouse %04x:%04x",
			 le16_to_cpu(dev->descriptor.idVendor),
			 le16_to_cpu(dev->descriptor.idProduct));

	usb_make_path(dev, mouse->phys, sizeof(mouse->phys));
	strlcat(mouse->phys, "/input0", sizeof(mouse->phys));

	input_dev->name = mouse->name;
	input_dev->phys = mouse->phys;
	usb_to_input_id(dev, &input_dev->id);
	input_dev->dev.parent = &intf->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
		BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
	input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
	input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
		BIT_MASK(BTN_EXTRA);
	input_dev->relbit[0] |= BIT_MASK(REL_WHEEL);

	input_set_drvdata(input_dev, mouse);

	input_dev->open = usb_mouse_open;
	input_dev->close = usb_mouse_close;

	usb_fill_int_urb(mouse->irq, dev, pipe, mouse->data,
			 (maxp > 8 ? 8 : maxp),
			 usb_mouse_irq, mouse, endpoint->bInterval);
	mouse->irq->transfer_dma = mouse->data_dma;
	mouse->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	error = input_register_device(mouse->dev);
	if (error)
		goto fail3;

	usb_set_intfdata(intf, mouse);
	printk("KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK\n");
	return 0;

fail3:	
	usb_free_urb(mouse->irq);
fail2:	
	usb_free_coherent(dev, 8, mouse->data, mouse->data_dma);
fail1:	
	input_free_device(input_dev);
	kfree(mouse);
	return error;
}

static void usb_mouse_disconnect(struct usb_interface *intf)
{
	printk("KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK\n");
	struct usb_mouse *mouse = usb_get_intfdata (intf);

	usb_set_intfdata(intf, NULL);
	if (mouse) {
		usb_kill_urb(mouse->irq);
		input_unregister_device(mouse->dev);
		usb_free_urb(mouse->irq);
		usb_free_coherent(interface_to_usbdev(intf), 8, mouse->data, mouse->data_dma);
		kfree(mouse);
	}
}

static const struct usb_device_id usb_mouse_id_table[] = {
	{ USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
		USB_INTERFACE_PROTOCOL_MOUSE) },
	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, usb_mouse_id_table);

static struct usb_driver usb_mouse_driver = {
	.name		= "per_driver",
	.probe		= usb_mouse_probe,
	.disconnect	= usb_mouse_disconnect,
	.id_table	= usb_mouse_id_table,
};

module_usb_driver(usb_mouse_driver);