hid-core.c

omap3 linux 2.6 用nocc去除了冗余代码

	list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
		for (i = 0; i < report->maxfield; i++) {
			field = report->field[i];
			for (j = 0; j < field->maxusage; j++) {
				usage = &field->usage[j];
				if ((usage->hid & HID_USAGE_PAGE) == page &&
				    (usage->hid & 0xFFFF) == hid_code) {
					*pfield = field;
					return j;
				}
			}
		}
	}
	return -1;
}

static void usbhid_set_leds(struct hid_device *hid)
{
	struct hid_field *field;
	int offset;

	if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
		hid_set_field(field, offset, 0);
		usbhid_submit_report(hid, field->report, USB_DIR_OUT);
	}
}

/*
 * Traverse the supplied list of reports and find the longest
 */
static void hid_find_max_report(struct hid_device *hid, unsigned int type, int *max)
{
	struct hid_report *report;
	int size;

	list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
		size = ((report->size - 1) >> 3) + 1;
		if (type == HID_INPUT_REPORT && hid->report_enum[type].numbered)
			size++;
		if (*max < size)
			*max = size;
	}
}

static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
{
	struct usbhid_device *usbhid = hid->driver_data;

	if (!(usbhid->inbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->inbuf_dma)))
		return -1;
	if (!(usbhid->outbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->outbuf_dma)))
		return -1;
	if (!(usbhid->cr = usb_buffer_alloc(dev, sizeof(*(usbhid->cr)), GFP_ATOMIC, &usbhid->cr_dma)))
		return -1;
	if (!(usbhid->ctrlbuf = usb_buffer_alloc(dev, usbhid->bufsize, GFP_ATOMIC, &usbhid->ctrlbuf_dma)))
		return -1;

	return 0;
}

static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
{
	struct usbhid_device *usbhid = hid->driver_data;

	usb_buffer_free(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
	usb_buffer_free(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
	usb_buffer_free(dev, sizeof(*(usbhid->cr)), usbhid->cr, usbhid->cr_dma);
	usb_buffer_free(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
}

/*
 * Cherry Cymotion keyboard have an invalid HID report descriptor,
 * that needs fixing before we can parse it.
 */

static void hid_fixup_cymotion_descriptor(char *rdesc, int rsize)
{
	if (rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
		info("Fixing up Cherry Cymotion report descriptor");
		rdesc[11] = rdesc[16] = 0xff;
		rdesc[12] = rdesc[17] = 0x03;
	}
}

/*
 * Sending HID_REQ_GET_REPORT changes the operation mode of the ps3 controller
 * to "operational".  Without this, the ps3 controller will not report any
 * events.
 */
static void hid_fixup_sony_ps3_controller(struct usb_device *dev, int ifnum)
{
	int result;
	char *buf = kmalloc(18, GFP_KERNEL);

	if (!buf)
		return;

	result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
				 HID_REQ_GET_REPORT,
				 USB_DIR_IN | USB_TYPE_CLASS |
				 USB_RECIP_INTERFACE,
				 (3 << 8) | 0xf2, ifnum, buf, 17,
				 USB_CTRL_GET_TIMEOUT);

	if (result < 0)
		err("%s failed: %d\n", __func__, result);

	kfree(buf);
}

/*
 * Certain Logitech keyboards send in report #3 keys which are far
 * above the logical maximum described in descriptor. This extends
 * the original value of 0x28c of logical maximum to 0x104d
 */
static void hid_fixup_logitech_descriptor(unsigned char *rdesc, int rsize)
{
	if (rsize >= 90 && rdesc[83] == 0x26
			&& rdesc[84] == 0x8c
			&& rdesc[85] == 0x02) {
		info("Fixing up Logitech keyboard report descriptor");
		rdesc[84] = rdesc[89] = 0x4d;
		rdesc[85] = rdesc[90] = 0x10;
	}
}

/*
 * Some USB barcode readers from cypress have usage min and usage max in
 * the wrong order
 */
static void hid_fixup_cypress_descriptor(unsigned char *rdesc, int rsize)
{
	short fixed = 0;
	int i;

	for (i = 0; i < rsize - 4; i++) {
		if (rdesc[i] == 0x29 && rdesc [i+2] == 0x19) {
			unsigned char tmp;

			rdesc[i] = 0x19; rdesc[i+2] = 0x29;
			tmp = rdesc[i+3];
			rdesc[i+3] = rdesc[i+1];
			rdesc[i+1] = tmp;
		}
	}

	if (fixed)
		info("Fixing up Cypress report descriptor");
}

static struct hid_device *usb_hid_configure(struct usb_interface *intf)
{
	struct usb_host_interface *interface = intf->cur_altsetting;
	struct usb_device *dev = interface_to_usbdev (intf);
	struct hid_descriptor *hdesc;
	struct hid_device *hid;
	u32 quirks = 0;
	unsigned rsize = 0;
	char *rdesc;
	int n, len, insize = 0;
	struct usbhid_device *usbhid;

	quirks = usbhid_lookup_quirk(le16_to_cpu(dev->descriptor.idVendor),
			le16_to_cpu(dev->descriptor.idProduct));

	/* Many keyboards and mice don't like to be polled for reports,
	 * so we will always set the HID_QUIRK_NOGET flag for them. */
	if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
		if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
			interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
				quirks |= HID_QUIRK_NOGET;
	}

	if (quirks & HID_QUIRK_IGNORE)
		return NULL;

	if ((quirks & HID_QUIRK_IGNORE_MOUSE) &&
		(interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE))
			return NULL;


	if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
	    (!interface->desc.bNumEndpoints ||
	     usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
		dbg("class descriptor not present\n");
		return NULL;
	}

	for (n = 0; n < hdesc->bNumDescriptors; n++)
		if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
			rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);

	if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
		dbg("weird size of report descriptor (%u)", rsize);
		return NULL;
	}

	if (!(rdesc = kmalloc(rsize, GFP_KERNEL))) {
		dbg("couldn't allocate rdesc memory");
		return NULL;
	}

	hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);

	if ((n = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber, HID_DT_REPORT, rdesc, rsize)) < 0) {
		dbg("reading report descriptor failed");
		kfree(rdesc);
		return NULL;
	}

	if ((quirks & HID_QUIRK_CYMOTION))
		hid_fixup_cymotion_descriptor(rdesc, rsize);

	if (quirks & HID_QUIRK_LOGITECH_DESCRIPTOR)
		hid_fixup_logitech_descriptor(rdesc, rsize);

	if (quirks & HID_QUIRK_SWAPPED_MIN_MAX)
		hid_fixup_cypress_descriptor(rdesc, rsize);


	if (!(hid = hid_parse_report(rdesc, n))) {
		dbg("parsing report descriptor failed");
		kfree(rdesc);
		return NULL;
	}

	kfree(rdesc);
	hid->quirks = quirks;

	if (!(usbhid = kzalloc(sizeof(struct usbhid_device), GFP_KERNEL)))
		goto fail;

	hid->driver_data = usbhid;
	usbhid->hid = hid;

	usbhid->bufsize = HID_MIN_BUFFER_SIZE;
	hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
	hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
	hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);

	if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
		usbhid->bufsize = HID_MAX_BUFFER_SIZE;

	hid_find_max_report(hid, HID_INPUT_REPORT, &insize);

	if (insize > HID_MAX_BUFFER_SIZE)
		insize = HID_MAX_BUFFER_SIZE;

	if (hid_alloc_buffers(dev, hid)) {
		hid_free_buffers(dev, hid);
		goto fail;
	}

	for (n = 0; n < interface->desc.bNumEndpoints; n++) {

		struct usb_endpoint_descriptor *endpoint;
		int pipe;
		int interval;

		endpoint = &interface->endpoint[n].desc;
		if ((endpoint->bmAttributes & 3) != 3)		/* Not an interrupt endpoint */
			continue;

		interval = endpoint->bInterval;

		/* Change the polling interval of mice. */
		if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
			interval = hid_mousepoll_interval;

		if (usb_endpoint_dir_in(endpoint)) {
			if (usbhid->urbin)
				continue;
			if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
				goto fail;
			pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
			usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
					 hid_irq_in, hid, interval);
			usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
			usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		} else {
			if (usbhid->urbout)
				continue;
			if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
				goto fail;
			pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
			usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
					 hid_irq_out, hid, interval);
			usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
			usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
		}
	}

	if (!usbhid->urbin) {
		err("couldn't find an input interrupt endpoint");
		goto fail;
	}

	init_waitqueue_head(&hid->wait);

	INIT_WORK(&usbhid->reset_work, hid_reset);
	setup_timer(&usbhid->io_retry, hid_retry_timeout, (unsigned long) hid);

	spin_lock_init(&usbhid->inlock);
	spin_lock_init(&usbhid->outlock);
	spin_lock_init(&usbhid->ctrllock);

	hid->version = le16_to_cpu(hdesc->bcdHID);
	hid->country = hdesc->bCountryCode;
	hid->dev = &intf->dev;
	usbhid->intf = intf;
	usbhid->ifnum = interface->desc.bInterfaceNumber;

	hid->name[0] = 0;

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

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

	if (!strlen(hid->name))
		snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
			 le16_to_cpu(dev->descriptor.idVendor),
			 le16_to_cpu(dev->descriptor.idProduct));

	hid->bus = BUS_USB;
	hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
	hid->product = le16_to_cpu(dev->descriptor.idProduct);

	usb_make_path(dev, hid->phys, sizeof(hid->phys));
	strlcat(hid->phys, "/input", sizeof(hid->phys));
	len = strlen(hid->phys);
	if (len < sizeof(hid->phys) - 1)
		snprintf(hid->phys + len, sizeof(hid->phys) - len,
			 "%d", intf->altsetting[0].desc.bInterfaceNumber);

	if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
		hid->uniq[0] = 0;

	usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
	if (!usbhid->urbctrl)
		goto fail;

	usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
			     usbhid->ctrlbuf, 1, hid_ctrl, hid);
	usbhid->urbctrl->setup_dma = usbhid->cr_dma;
	usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
	usbhid->urbctrl->transfer_flags |= (URB_NO_TRANSFER_DMA_MAP | URB_NO_SETUP_DMA_MAP);
	hid->hidinput_input_event = usb_hidinput_input_event;
	hid->hid_open = usbhid_open;
	hid->hid_close = usbhid_close;
	return hid;

fail:
	usb_free_urb(usbhid->urbin);
	usb_free_urb(usbhid->urbout);
	usb_free_urb(usbhid->urbctrl);
	hid_free_buffers(dev, hid);
	hid_free_device(hid);

	return NULL;
}

static void hid_disconnect(struct usb_interface *intf)
{
	struct hid_device *hid = usb_get_intfdata (intf);
	struct usbhid_device *usbhid;

	if (!hid)
		return;

	usbhid = hid->driver_data;

	spin_lock_irq(&usbhid->inlock);	/* Sync with error handler */
	usb_set_intfdata(intf, NULL);
	spin_unlock_irq(&usbhid->inlock);
	usb_kill_urb(usbhid->urbin);
	usb_kill_urb(usbhid->urbout);
	usb_kill_urb(usbhid->urbctrl);

	del_timer_sync(&usbhid->io_retry);
	flush_scheduled_work();

	if (hid->claimed & HID_CLAIMED_INPUT)
		hidinput_disconnect(hid);
	if (hid->claimed & HID_CLAIMED_HIDDEV)
		hiddev_disconnect(hid);

	usb_free_urb(usbhid->urbin);
	usb_free_urb(usbhid->urbctrl);
	usb_free_urb(usbhid->urbout);

	hid_free_buffers(hid_to_usb_dev(hid), hid);
	hid_free_device(hid);
}

static int hid_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct hid_device *hid;
	char path[64];
	int i;
	char *c;

	dbg("HID probe called for ifnum %d",
			intf->altsetting->desc.bInterfaceNumber);

	if (!(hid = usb_hid_configure(intf)))
		return -ENODEV;

	usbhid_init_reports(hid);
	hid_dump_device(hid);
	if (hid->quirks & HID_QUIRK_RESET_LEDS)
		usbhid_set_leds(hid);

	if (!hidinput_connect(hid))
		hid->claimed |= HID_CLAIMED_INPUT;
	if (!hiddev_connect(hid))
		hid->claimed |= HID_CLAIMED_HIDDEV;

	usb_set_intfdata(intf, hid);

	if (!hid->claimed) {
		printk ("HID device not claimed by input or hiddev\n");
		hid_disconnect(intf);
		return -ENODEV;
	}

	if ((hid->claimed & HID_CLAIMED_INPUT))
		hid_ff_init(hid);

	if (hid->quirks & HID_QUIRK_SONY_PS3_CONTROLLER)
		hid_fixup_sony_ps3_controller(interface_to_usbdev(intf),
			intf->cur_altsetting->desc.bInterfaceNumber);

	printk(KERN_INFO);

	if (hid->claimed & HID_CLAIMED_INPUT)
		printk("input");
	if (hid->claimed == (HID_CLAIMED_INPUT | HID_CLAIMED_HIDDEV))
		printk(",");
	if (hid->claimed & HID_CLAIMED_HIDDEV)
		printk("hiddev%d", hid->minor);

	c = "Device";
	for (i = 0; i < hid->maxcollection; i++) {
		if (hid->collection[i].type == HID_COLLECTION_APPLICATION &&
		    (hid->collection[i].usage & HID_USAGE_PAGE) == HID_UP_GENDESK &&
		    (hid->collection[i].usage & 0xffff) < ARRAY_SIZE(hid_types)) {
			c = hid_types[hid->collection[i].usage & 0xffff];
			break;
		}
	}

	usb_make_path(interface_to_usbdev(intf), path, 63);

	printk(": USB HID v%x.%02x %s [%s] on %s\n",
		hid->version >> 8, hid->version & 0xff, c, hid->name, path);

	return 0;
}

static int hid_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct hid_device *hid = usb_get_intfdata (intf);
	struct usbhid_device *usbhid = hid->driver_data;

	spin_lock_irq(&usbhid->inlock);	/* Sync with error handler */
	set_bit(HID_SUSPENDED, &usbhid->iofl);
	spin_unlock_irq(&usbhid->inlock);
	del_timer(&usbhid->io_retry);
	usb_kill_urb(usbhid->urbin);
	dev_dbg(&intf->dev, "suspend\n");
	return 0;
}

static int hid_resume(struct usb_interface *intf)
{
	struct hid_device *hid = usb_get_intfdata (intf);
	struct usbhid_device *usbhid = hid->driver_data;
	int status;

	clear_bit(HID_SUSPENDED, &usbhid->iofl);
	usbhid->retry_delay = 0;
	status = hid_start_in(hid);
	dev_dbg(&intf->dev, "resume status %d\n", status);
	return status;
}

/* Treat USB reset pretty much the same as suspend/resume */
static void hid_pre_reset(struct usb_interface *intf)
{
	/* FIXME: What if the interface is already suspended? */
	hid_suspend(intf, PMSG_ON);
}

static void hid_post_reset(struct usb_interface *intf)
{
	struct usb_device *dev = interface_to_usbdev (intf);

	hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
	/* FIXME: Any more reinitialization needed? */

	hid_resume(intf);
}

static struct usb_device_id hid_usb_ids [] = {
	{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
		.bInterfaceClass = USB_INTERFACE_CLASS_HID },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, hid_usb_ids);

static struct usb_driver hid_driver = {
	.name =		"usbhid",
	.probe =	hid_probe,
	.disconnect =	hid_disconnect,
	.suspend =	hid_suspend,
	.resume =	hid_resume,
	.pre_reset =	hid_pre_reset,
	.post_reset =	hid_post_reset,
	.id_table =	hid_usb_ids,
};

static int __init hid_init(void)
{
	int retval;
	retval = usbhid_quirks_init(quirks_param);
	if (retval)
		goto usbhid_quirks_init_fail;
	retval = hiddev_init();
	if (retval)
		goto hiddev_init_fail;
	retval = usb_register(&hid_driver);
	if (retval)
		goto usb_register_fail;
	info(DRIVER_VERSION ":" DRIVER_DESC);

	return 0;
usb_register_fail:
	hiddev_exit();
hiddev_init_fail:
	usbhid_quirks_exit();
usbhid_quirks_init_fail:
	return retval;
}

static void __exit hid_exit(void)
{
	usb_deregister(&hid_driver);
	hiddev_exit();
	usbhid_quirks_exit();
}

module_init(hid_init);
module_exit(hid_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);