hid-core.c

omap3 linux 2.6 用nocc去除了冗余代码

/*
 *  USB HID support for Linux
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <[e-mail]>
 *  Copyright (c) 2005 Michael Haboustak <[e-mail]> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 */

/*
 * 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/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include <linux/input.h>
#include <linux/wait.h>

#include <linux/usb.h>

#include <linux/hid.h>
#include <linux/hiddev.h>
#include <linux/hid-debug.h>
#include "usbhid.h"

/*
 * Version Information
 */

#define DRIVER_VERSION "v2.6"
#define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik, Jiri Kosina"
#define DRIVER_DESC "USB HID core driver"
#define DRIVER_LICENSE "GPL"

static char *hid_types[] = {"Device", "Pointer", "Mouse", "Device", "Joystick",
				"Gamepad", "Keyboard", "Keypad", "Multi-Axis Controller"};
/*
 * Module parameters.
 */

static unsigned int hid_mousepoll_interval;
module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
MODULE_PARM_DESC(mousepoll, "Polling interval of mice");

/* Quirks specified at module load time */
static char *quirks_param[MAX_USBHID_BOOT_QUIRKS] = { [ 0 ... (MAX_USBHID_BOOT_QUIRKS - 1) ] = NULL };
module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
		" quirks=vendorID:productID:quirks"
		" where vendorID, productID, and quirks are all in"
		" 0x-prefixed hex");
/*
 * Input submission and I/O error handler.
 */

static void hid_io_error(struct hid_device *hid);

/* Start up the input URB */
static int hid_start_in(struct hid_device *hid)
{
	unsigned long flags;
	int rc = 0;
	struct usbhid_device *usbhid = hid->driver_data;

	spin_lock_irqsave(&usbhid->inlock, flags);
	if (hid->open > 0 && !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
			!test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
		rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
		if (rc != 0)
			clear_bit(HID_IN_RUNNING, &usbhid->iofl);
	}
	spin_unlock_irqrestore(&usbhid->inlock, flags);
	return rc;
}

/* I/O retry timer routine */
static void hid_retry_timeout(unsigned long _hid)
{
	struct hid_device *hid = (struct hid_device *) _hid;
	struct usbhid_device *usbhid = hid->driver_data;

	dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
	if (hid_start_in(hid))
		hid_io_error(hid);
}

/* Workqueue routine to reset the device or clear a halt */
static void hid_reset(struct work_struct *work)
{
	struct usbhid_device *usbhid =
		container_of(work, struct usbhid_device, reset_work);
	struct hid_device *hid = usbhid->hid;
	int rc_lock, rc = 0;

	if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
		dev_dbg(&usbhid->intf->dev, "clear halt\n");
		rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
		clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
		hid_start_in(hid);
	}

	else if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
		dev_dbg(&usbhid->intf->dev, "resetting device\n");
		rc = rc_lock = usb_lock_device_for_reset(hid_to_usb_dev(hid), usbhid->intf);
		if (rc_lock >= 0) {
			rc = usb_reset_composite_device(hid_to_usb_dev(hid), usbhid->intf);
			if (rc_lock)
				usb_unlock_device(hid_to_usb_dev(hid));
		}
		clear_bit(HID_RESET_PENDING, &usbhid->iofl);
	}

	switch (rc) {
	case 0:
		if (!test_bit(HID_IN_RUNNING, &usbhid->iofl))
			hid_io_error(hid);
		break;
	default:
		err("can't reset device, %s-%s/input%d, status %d",
				hid_to_usb_dev(hid)->bus->bus_name,
				hid_to_usb_dev(hid)->devpath,
				usbhid->ifnum, rc);
		/* FALLTHROUGH */
	case -EHOSTUNREACH:
	case -ENODEV:
	case -EINTR:
		break;
	}
}

/* Main I/O error handler */
static void hid_io_error(struct hid_device *hid)
{
	unsigned long flags;
	struct usbhid_device *usbhid = hid->driver_data;

	spin_lock_irqsave(&usbhid->inlock, flags);

	/* Stop when disconnected */
	if (usb_get_intfdata(usbhid->intf) == NULL)
		goto done;

	/* If it has been a while since the last error, we'll assume
	 * this a brand new error and reset the retry timeout. */
	if (time_after(jiffies, usbhid->stop_retry + HZ/2))
		usbhid->retry_delay = 0;

	/* When an error occurs, retry at increasing intervals */
	if (usbhid->retry_delay == 0) {
		usbhid->retry_delay = 13;	/* Then 26, 52, 104, 104, ... */
		usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
	} else if (usbhid->retry_delay < 100)
		usbhid->retry_delay *= 2;

	if (time_after(jiffies, usbhid->stop_retry)) {

		/* Retries failed, so do a port reset */
		if (!test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
			schedule_work(&usbhid->reset_work);
			goto done;
		}
	}

	mod_timer(&usbhid->io_retry,
			jiffies + msecs_to_jiffies(usbhid->retry_delay));
done:
	spin_unlock_irqrestore(&usbhid->inlock, flags);
}

/*
 * Input interrupt completion handler.
 */

static void hid_irq_in(struct urb *urb)
{
	struct hid_device	*hid = urb->context;
	struct usbhid_device 	*usbhid = hid->driver_data;
	int			status;

	switch (urb->status) {
		case 0:			/* success */
			usbhid->retry_delay = 0;
			hid_input_report(urb->context, HID_INPUT_REPORT,
					 urb->transfer_buffer,
					 urb->actual_length, 1);
			break;
		case -EPIPE:		/* stall */
			clear_bit(HID_IN_RUNNING, &usbhid->iofl);
			set_bit(HID_CLEAR_HALT, &usbhid->iofl);
			schedule_work(&usbhid->reset_work);
			return;
		case -ECONNRESET:	/* unlink */
		case -ENOENT:
		case -ESHUTDOWN:	/* unplug */
			clear_bit(HID_IN_RUNNING, &usbhid->iofl);
			return;
		case -EILSEQ:		/* protocol error or unplug */
		case -EPROTO:		/* protocol error or unplug */
		case -ETIME:		/* protocol error or unplug */
		case -ETIMEDOUT:	/* Should never happen, but... */
			clear_bit(HID_IN_RUNNING, &usbhid->iofl);
			hid_io_error(hid);
			return;
		default:		/* error */
			warn("input irq status %d received", urb->status);
	}

	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status) {
		clear_bit(HID_IN_RUNNING, &usbhid->iofl);
		if (status != -EPERM) {
			err("can't resubmit intr, %s-%s/input%d, status %d",
					hid_to_usb_dev(hid)->bus->bus_name,
					hid_to_usb_dev(hid)->devpath,
					usbhid->ifnum, status);
			hid_io_error(hid);
		}
	}
}

static int hid_submit_out(struct hid_device *hid)
{
	struct hid_report *report;
	struct usbhid_device *usbhid = hid->driver_data;

	report = usbhid->out[usbhid->outtail];

	hid_output_report(report, usbhid->outbuf);
	usbhid->urbout->transfer_buffer_length = ((report->size - 1) >> 3) + 1 + (report->id > 0);
	usbhid->urbout->dev = hid_to_usb_dev(hid);

	dbg("submitting out urb");

	if (usb_submit_urb(usbhid->urbout, GFP_ATOMIC)) {
		err("usb_submit_urb(out) failed");
		return -1;
	}

	return 0;
}

static int hid_submit_ctrl(struct hid_device *hid)
{
	struct hid_report *report;
	unsigned char dir;
	int len;
	struct usbhid_device *usbhid = hid->driver_data;

	report = usbhid->ctrl[usbhid->ctrltail].report;
	dir = usbhid->ctrl[usbhid->ctrltail].dir;

	len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
	if (dir == USB_DIR_OUT) {
		hid_output_report(report, usbhid->ctrlbuf);
		usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
		usbhid->urbctrl->transfer_buffer_length = len;
	} else {
		int maxpacket, padlen;

		usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
		maxpacket = usb_maxpacket(hid_to_usb_dev(hid), usbhid->urbctrl->pipe, 0);
		if (maxpacket > 0) {
			padlen = (len + maxpacket - 1) / maxpacket;
			padlen *= maxpacket;
			if (padlen > usbhid->bufsize)
				padlen = usbhid->bufsize;
		} else
			padlen = 0;
		usbhid->urbctrl->transfer_buffer_length = padlen;
	}
	usbhid->urbctrl->dev = hid_to_usb_dev(hid);

	usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
	usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT : HID_REQ_GET_REPORT;
	usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) | report->id);
	usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
	usbhid->cr->wLength = cpu_to_le16(len);

	dbg("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u",
		usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" : "Get_Report",
		usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);

	if (usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC)) {
		err("usb_submit_urb(ctrl) failed");
		return -1;
	}

	return 0;
}

/*
 * Output interrupt completion handler.
 */

static void hid_irq_out(struct urb *urb)
{
	struct hid_device *hid = urb->context;
	struct usbhid_device *usbhid = hid->driver_data;
	unsigned long flags;
	int unplug = 0;

	switch (urb->status) {
		case 0:			/* success */
			break;
		case -ESHUTDOWN:	/* unplug */
			unplug = 1;
		case -EILSEQ:		/* protocol error or unplug */
		case -EPROTO:		/* protocol error or unplug */
		case -ECONNRESET:	/* unlink */
		case -ENOENT:
			break;
		default:		/* error */
			warn("output irq status %d received", urb->status);
	}

	spin_lock_irqsave(&usbhid->outlock, flags);

	if (unplug)
		usbhid->outtail = usbhid->outhead;
	else
		usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);

	if (usbhid->outhead != usbhid->outtail) {
		if (hid_submit_out(hid)) {
			clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
			wake_up(&hid->wait);
		}
		spin_unlock_irqrestore(&usbhid->outlock, flags);
		return;
	}

	clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
	spin_unlock_irqrestore(&usbhid->outlock, flags);
	wake_up(&hid->wait);
}

/*
 * Control pipe completion handler.
 */

static void hid_ctrl(struct urb *urb)
{
	struct hid_device *hid = urb->context;
	struct usbhid_device *usbhid = hid->driver_data;
	unsigned long flags;
	int unplug = 0;

	spin_lock_irqsave(&usbhid->ctrllock, flags);

	switch (urb->status) {
		case 0:			/* success */
			if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
				hid_input_report(urb->context, usbhid->ctrl[usbhid->ctrltail].report->type,
						urb->transfer_buffer, urb->actual_length, 0);
			break;
		case -ESHUTDOWN:	/* unplug */
			unplug = 1;
		case -EILSEQ:		/* protocol error or unplug */
		case -EPROTO:		/* protocol error or unplug */
		case -ECONNRESET:	/* unlink */
		case -ENOENT:
		case -EPIPE:		/* report not available */
			break;
		default:		/* error */
			warn("ctrl urb status %d received", urb->status);
	}

	if (unplug)
		usbhid->ctrltail = usbhid->ctrlhead;
	else
		usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);

	if (usbhid->ctrlhead != usbhid->ctrltail) {
		if (hid_submit_ctrl(hid)) {
			clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
			wake_up(&hid->wait);
		}
		spin_unlock_irqrestore(&usbhid->ctrllock, flags);
		return;
	}

	clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
	spin_unlock_irqrestore(&usbhid->ctrllock, flags);
	wake_up(&hid->wait);
}

void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
{
	int head;
	unsigned long flags;
	struct usbhid_device *usbhid = hid->driver_data;

	if ((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN)
		return;

	if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {

		spin_lock_irqsave(&usbhid->outlock, flags);

		if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
			spin_unlock_irqrestore(&usbhid->outlock, flags);
			warn("output queue full");
			return;
		}

		usbhid->out[usbhid->outhead] = report;
		usbhid->outhead = head;

		if (!test_and_set_bit(HID_OUT_RUNNING, &usbhid->iofl))
			if (hid_submit_out(hid))
				clear_bit(HID_OUT_RUNNING, &usbhid->iofl);

		spin_unlock_irqrestore(&usbhid->outlock, flags);
		return;
	}

	spin_lock_irqsave(&usbhid->ctrllock, flags);

	if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
		spin_unlock_irqrestore(&usbhid->ctrllock, flags);
		warn("control queue full");
		return;
	}

	usbhid->ctrl[usbhid->ctrlhead].report = report;
	usbhid->ctrl[usbhid->ctrlhead].dir = dir;
	usbhid->ctrlhead = head;

	if (!test_and_set_bit(HID_CTRL_RUNNING, &usbhid->iofl))
		if (hid_submit_ctrl(hid))
			clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);

	spin_unlock_irqrestore(&usbhid->ctrllock, flags);
}

static int usb_hidinput_input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct hid_field *field;
	int offset;

	if (type == EV_FF)
		return input_ff_event(dev, type, code, value);

	if (type != EV_LED)
		return -1;

	if ((offset = hidinput_find_field(hid, type, code, &field)) == -1) {
		warn("event field not found");
		return -1;
	}

	hid_set_field(field, offset, value);
	usbhid_submit_report(hid, field->report, USB_DIR_OUT);

	return 0;
}

int usbhid_wait_io(struct hid_device *hid)
{
	struct usbhid_device *usbhid = hid->driver_data;

	if (!wait_event_timeout(hid->wait, (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
					!test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
					10*HZ)) {
		dbg("timeout waiting for ctrl or out queue to clear");
		return -1;
	}

	return 0;
}

static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
{
	return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
		HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
		ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
}

static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
		unsigned char type, void *buf, int size)
{
	int result, retries = 4;

	memset(buf, 0, size);

	do {
		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
				USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
				(type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
		retries--;
	} while (result < size && retries);
	return result;
}

int usbhid_open(struct hid_device *hid)
{
	++hid->open;
	if (hid_start_in(hid))
		hid_io_error(hid);
	return 0;
}

void usbhid_close(struct hid_device *hid)
{
	struct usbhid_device *usbhid = hid->driver_data;

	if (!--hid->open)
		usb_kill_urb(usbhid->urbin);
}

/*
 * Initialize all reports
 */

void usbhid_init_reports(struct hid_device *hid)
{
	struct hid_report *report;
	struct usbhid_device *usbhid = hid->driver_data;
	int err, ret;

	list_for_each_entry(report, &hid->report_enum[HID_INPUT_REPORT].report_list, list)
		usbhid_submit_report(hid, report, USB_DIR_IN);

	list_for_each_entry(report, &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
		usbhid_submit_report(hid, report, USB_DIR_IN);

	err = 0;
	ret = usbhid_wait_io(hid);
	while (ret) {
		err |= ret;
		if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
			usb_kill_urb(usbhid->urbctrl);
		if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
			usb_kill_urb(usbhid->urbout);
		ret = usbhid_wait_io(hid);
	}

	if (err)
		warn("timeout initializing reports");
}

/*
 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
 */
static int hid_find_field_early(struct hid_device *hid, unsigned int page,
    unsigned int hid_code, struct hid_field **pfield)
{
	struct hid_report *report;
	struct hid_field *field;
	struct hid_usage *usage;
	int i, j;