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/*
 * WUSB Host Wire Adapter: Radio Control Interface (WUSB[8.6])
 * Radio Control command/event transport
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * Initialize the Radio Control interface Driver.
 *
 * For each device probed, creates an 'struct hwarc' which contains
 * just the representation of the UWB Radio Controller, and the logic
 * for reading notifications and passing them to the UWB Core.
 *
 * So we initialize all of those, register the UWB Radio Controller
 * and setup the notification/event handle to pipe the notifications
 * to the UWB management Daemon.
 *
 * Command and event filtering.
 *
 * This is the driver for the Radio Control Interface described in WUSB
 * 1.0. The core UWB module assumes that all drivers are compliant to the
 * WHCI 0.95 specification. We thus create a filter that parses all
 * incoming messages from the (WUSB 1.0) device and manipulate them to
 * conform to the WHCI 0.95 specification. Similarly, outgoing messages
 * are parsed and manipulated to conform to the WUSB 1.0 compliant messages
 * that the device expects. Only a few messages are affected:
 * Affected events:
 *    UWB_RC_EVT_BEACON
 *    UWB_RC_EVT_BP_SLOT_CHANGE
 *    UWB_RC_EVT_DRP_AVAIL
 *    UWB_RC_EVT_DRP
 * Affected commands:
 *    UWB_RC_CMD_SCAN
 *    UWB_RC_CMD_SET_DRP_IE
 *
 *
 *
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/wusb.h>
#include <linux/usb/wusb-wa.h>
#include <linux/uwb.h>

#include "uwb-internal.h"

/* The device uses commands and events from the WHCI specification, although
 * reporting itself as WUSB compliant. */
#define WUSB_QUIRK_WHCI_CMD_EVT		0x01

/**
 * Descriptor for an instance of the UWB Radio Control Driver that
 * attaches to the RCI interface of the Host Wired Adapter.
 *
 * Unless there is a lock specific to the 'data members', all access
 * is protected by uwb_rc->mutex.
 *
 * The NEEP (Notification/Event EndPoint) URB (@neep_urb) writes to
 * @rd_buffer. Note there is no locking because it is perfectly (heh!)
 * serialized--probe() submits an URB, callback is called, processes
 * the data (synchronously), submits another URB, and so on. There is
 * no concurrent access to the buffer.
 */
struct hwarc {
	struct usb_device *usb_dev;
	struct usb_interface *usb_iface;
	struct uwb_rc *uwb_rc;		/* UWB host controller */
	struct urb *neep_urb;		/* Notification endpoint handling */
	struct edc neep_edc;
	void *rd_buffer;		/* NEEP read buffer */
};


/* Beacon received notification (WUSB 1.0 [8.6.3.2]) */
struct uwb_rc_evt_beacon_WUSB_0100 {
	struct uwb_rceb rceb;
	u8	bChannelNumber;
	__le16	wBPSTOffset;
	u8	bLQI;
	u8	bRSSI;
	__le16	wBeaconInfoLength;
	u8	BeaconInfo[];
} __attribute__((packed));

/**
 * Filter WUSB 1.0 BEACON RCV notification to be WHCI 0.95
 *
 * @header: the incoming event
 * @buf_size: size of buffer containing incoming event
 * @new_size: size of event after filtering completed
 *
 * The WHCI 0.95 spec has a "Beacon Type" field. This value is unknown at
 * the time we receive the beacon from WUSB so we just set it to
 * UWB_RC_BEACON_TYPE_NEIGHBOR as a default.
 * The solution below allocates memory upon receipt of every beacon from a
 * WUSB device. This will deteriorate performance. What is the right way to
 * do this?
 */
static
int hwarc_filter_evt_beacon_WUSB_0100(struct uwb_rc *rc,
				      struct uwb_rceb **header,
				      const size_t buf_size,
				      size_t *new_size)
{
	struct uwb_rc_evt_beacon_WUSB_0100 *be;
	struct uwb_rc_evt_beacon *newbe;
	size_t bytes_left, ielength;
	struct device *dev = &rc->uwb_dev.dev;

	be = container_of(*header, struct uwb_rc_evt_beacon_WUSB_0100, rceb);
	bytes_left = buf_size;
	if (bytes_left < sizeof(*be)) {
		dev_err(dev, "Beacon Received Notification: Not enough data "
			"to decode for filtering (%zu vs %zu bytes needed)\n",
			bytes_left, sizeof(*be));
		return -EINVAL;
	}
	bytes_left -= sizeof(*be);
	ielength = le16_to_cpu(be->wBeaconInfoLength);
	if (bytes_left < ielength) {
		dev_err(dev, "Beacon Received Notification: Not enough data "
			"to decode IEs (%zu vs %zu bytes needed)\n",
			bytes_left, ielength);
		return -EINVAL;
	}
	newbe = kzalloc(sizeof(*newbe) + ielength, GFP_ATOMIC);
	if (newbe == NULL)
		return -ENOMEM;
	newbe->rceb = be->rceb;
	newbe->bChannelNumber = be->bChannelNumber;
	newbe->bBeaconType = UWB_RC_BEACON_TYPE_NEIGHBOR;
	newbe->wBPSTOffset = be->wBPSTOffset;
	newbe->bLQI = be->bLQI;
	newbe->bRSSI = be->bRSSI;
	newbe->wBeaconInfoLength = be->wBeaconInfoLength;
	memcpy(newbe->BeaconInfo, be->BeaconInfo, ielength);
	*header = &newbe->rceb;
	*new_size = sizeof(*newbe) + ielength;
	return 1;  /* calling function will free memory */
}


/* DRP Availability change notification (WUSB 1.0 [8.6.3.8]) */
struct uwb_rc_evt_drp_avail_WUSB_0100 {
	struct uwb_rceb rceb;
	__le16 wIELength;
	u8 IEData[];
} __attribute__((packed));

/**
 * Filter WUSB 1.0 DRP AVAILABILITY CHANGE notification to be WHCI 0.95
 *
 * @header: the incoming event
 * @buf_size: size of buffer containing incoming event
 * @new_size: size of event after filtering completed
 */
static
int hwarc_filter_evt_drp_avail_WUSB_0100(struct uwb_rc *rc,
					 struct uwb_rceb **header,
					 const size_t buf_size,
					 size_t *new_size)
{
	struct uwb_rc_evt_drp_avail_WUSB_0100 *da;
	struct uwb_rc_evt_drp_avail *newda;
	struct uwb_ie_hdr *ie_hdr;
	size_t bytes_left, ielength;
	struct device *dev = &rc->uwb_dev.dev;


	da = container_of(*header, struct uwb_rc_evt_drp_avail_WUSB_0100, rceb);
	bytes_left = buf_size;
	if (bytes_left < sizeof(*da)) {
		dev_err(dev, "Not enough data to decode DRP Avail "
			"Notification for filtering. Expected %zu, "
			"received %zu.\n", (size_t)sizeof(*da), bytes_left);
		return -EINVAL;
	}
	bytes_left -= sizeof(*da);
	ielength = le16_to_cpu(da->wIELength);
	if (bytes_left < ielength) {
		dev_err(dev, "DRP Avail Notification filter: IE length "
			"[%zu bytes] does not match actual length "
			"[%zu bytes].\n", ielength, bytes_left);
		return -EINVAL;
	}
	if (ielength < sizeof(*ie_hdr)) {
		dev_err(dev, "DRP Avail Notification filter: Not enough "
			"data to decode IE [%zu bytes, %zu needed]\n",
			ielength, sizeof(*ie_hdr));
		return -EINVAL;
	}
	ie_hdr = (void *) da->IEData;
	if (ie_hdr->length > 32) {
		dev_err(dev, "DRP Availability Change event has unexpected "
			"length for filtering. Expected < 32 bytes, "
			"got %zu bytes.\n", (size_t)ie_hdr->length);
		return -EINVAL;
	}
	newda = kzalloc(sizeof(*newda), GFP_ATOMIC);
	if (newda == NULL)
		return -ENOMEM;
	newda->rceb = da->rceb;
	memcpy(newda->bmp, (u8 *) ie_hdr + sizeof(*ie_hdr), ie_hdr->length);
	*header = &newda->rceb;
	*new_size = sizeof(*newda);
	return 1; /* calling function will free memory */
}


/* DRP notification (WUSB 1.0 [8.6.3.9]) */
struct uwb_rc_evt_drp_WUSB_0100 {
	struct uwb_rceb rceb;
	struct uwb_dev_addr wSrcAddr;
	u8 bExplicit;
	__le16 wIELength;
	u8 IEData[];
} __attribute__((packed));

/**
 * Filter WUSB 1.0 DRP Notification to be WHCI 0.95
 *
 * @header: the incoming event
 * @buf_size: size of buffer containing incoming event
 * @new_size: size of event after filtering completed
 *
 * It is hard to manage DRP reservations without having a Reason code.
 * Unfortunately there is none in the WUSB spec. We just set the default to
 * DRP IE RECEIVED.
 * We do not currently use the bBeaconSlotNumber value, so we set this to
 * zero for now.
 */
static
int hwarc_filter_evt_drp_WUSB_0100(struct uwb_rc *rc,
				   struct uwb_rceb **header,
				   const size_t buf_size,
				   size_t *new_size)
{
	struct uwb_rc_evt_drp_WUSB_0100 *drpev;
	struct uwb_rc_evt_drp *newdrpev;
	size_t bytes_left, ielength;
	struct device *dev = &rc->uwb_dev.dev;

	drpev = container_of(*header, struct uwb_rc_evt_drp_WUSB_0100, rceb);
	bytes_left = buf_size;
	if (bytes_left < sizeof(*drpev)) {
		dev_err(dev, "Not enough data to decode DRP Notification "
			"for filtering. Expected %zu, received %zu.\n",
			(size_t)sizeof(*drpev), bytes_left);
		return -EINVAL;
	}
	ielength = le16_to_cpu(drpev->wIELength);
	bytes_left -= sizeof(*drpev);
	if (bytes_left < ielength) {
		dev_err(dev, "DRP Notification filter: header length [%zu "
			"bytes] does not match actual length [%zu "
			"bytes].\n", ielength, bytes_left);
		return -EINVAL;
	}
	newdrpev = kzalloc(sizeof(*newdrpev) + ielength, GFP_ATOMIC);
	if (newdrpev == NULL)
		return -ENOMEM;
	newdrpev->rceb = drpev->rceb;
	newdrpev->src_addr = drpev->wSrcAddr;
	newdrpev->reason = UWB_DRP_NOTIF_DRP_IE_RCVD;
	newdrpev->beacon_slot_number = 0;
	newdrpev->ie_length = drpev->wIELength;
	memcpy(newdrpev->ie_data, drpev->IEData, ielength);
	*header = &newdrpev->rceb;
	*new_size = sizeof(*newdrpev) + ielength;
	return 1; /* calling function will free memory */
}


/* Scan Command (WUSB 1.0 [8.6.2.5]) */
struct uwb_rc_cmd_scan_WUSB_0100 {
	struct uwb_rccb rccb;
	u8 bChannelNumber;
	u8 bScanState;
} __attribute__((packed));

/**
 * Filter WHCI 0.95 SCAN command to be WUSB 1.0 SCAN command
 *
 * @header:   command sent to device (compliant to WHCI 0.95)
 * @size:     size of command sent to device
 *
 * We only reduce the size by two bytes because the WUSB 1.0 scan command
 * does not have the last field (wStarttime). Also, make sure we don't send
 * the device an unexpected scan type.
 */
static
int hwarc_filter_cmd_scan_WUSB_0100(struct uwb_rc *rc,
				    struct uwb_rccb **header,
				    size_t *size)
{
	struct uwb_rc_cmd_scan *sc;

	sc = container_of(*header, struct uwb_rc_cmd_scan, rccb);

	if (sc->bScanState == UWB_SCAN_ONLY_STARTTIME)
		sc->bScanState = UWB_SCAN_ONLY;
	/* Don't send the last two bytes. */
	*size -= 2;
	return 0;
}


/* SET DRP IE command (WUSB 1.0 [8.6.2.7]) */
struct uwb_rc_cmd_set_drp_ie_WUSB_0100 {
	struct uwb_rccb rccb;
	u8 bExplicit;
	__le16 wIELength;
	struct uwb_ie_drp IEData[];
} __attribute__((packed));

/**
 * Filter WHCI 0.95 SET DRP IE command to be WUSB 1.0 SET DRP IE command
 *
 * @header:   command sent to device (compliant to WHCI 0.95)
 * @size:     size of command sent to device
 *
 * WUSB has an extra bExplicit field - we assume always explicit
 * negotiation so this field is set. The command expected by the device is
 * thus larger than the one prepared by the driver so we need to
 * reallocate memory to accommodate this.
 * We trust the driver to send us the correct data so no checking is done
 * on incoming data - evn though it is variable length.
 */
static
int hwarc_filter_cmd_set_drp_ie_WUSB_0100(struct uwb_rc *rc,
					  struct uwb_rccb **header,
					  size_t *size)
{
	struct uwb_rc_cmd_set_drp_ie *orgcmd;
	struct uwb_rc_cmd_set_drp_ie_WUSB_0100 *cmd;
	size_t ielength;

	orgcmd = container_of(*header, struct uwb_rc_cmd_set_drp_ie, rccb);
	ielength = le16_to_cpu(orgcmd->wIELength);
	cmd = kzalloc(sizeof(*cmd) + ielength, GFP_KERNEL);
	if (cmd == NULL)
		return -ENOMEM;
	cmd->rccb = orgcmd->rccb;
	cmd->bExplicit = 0;
	cmd->wIELength = orgcmd->wIELength;
	memcpy(cmd->IEData, orgcmd->IEData, ielength);
	*header = &cmd->rccb;
	*size = sizeof(*cmd) + ielength;