linux/drivers/uwb/hwa-rc.c
Thomas Gleixner 04672fe6d6 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 268
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 46 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141334.135501091@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:30:29 +02:00

930 lines
28 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
*
* 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;
return 1; /* calling function will free memory */
}
/**
* Filter data from WHCI driver to WUSB device
*
* @header: WHCI 0.95 compliant command from driver
* @size: length of command
*
* The routine managing commands to the device (uwb_rc_cmd()) will call the
* filtering function pointer (if it exists) before it passes any data to
* the device. At this time the command has been formatted according to
* WHCI 0.95 and is ready to be sent to the device.
*
* The filter function will be provided with the current command and its
* length. The function will manipulate the command if necessary and
* potentially reallocate memory for a command that needed more memory that
* the given command. If new memory was created the function will return 1
* to indicate to the calling function that the memory need to be freed
* when not needed any more. The size will contain the new length of the
* command.
* If memory has not been allocated we rely on the original mechanisms to
* free the memory of the command - even when we reduce the value of size.
*/
static
int hwarc_filter_cmd_WUSB_0100(struct uwb_rc *rc, struct uwb_rccb **header,
size_t *size)
{
int result;
struct uwb_rccb *rccb = *header;
int cmd = le16_to_cpu(rccb->wCommand);
switch (cmd) {
case UWB_RC_CMD_SCAN:
result = hwarc_filter_cmd_scan_WUSB_0100(rc, header, size);
break;
case UWB_RC_CMD_SET_DRP_IE:
result = hwarc_filter_cmd_set_drp_ie_WUSB_0100(rc, header, size);
break;
default:
result = -ENOANO;
break;
}
return result;
}
/**
* Filter data from WHCI driver to WUSB device
*
* @header: WHCI 0.95 compliant command from driver
* @size: length of command
*
* Filter commands based on which protocol the device supports. The WUSB
* errata should be the same as WHCI 0.95 so we do not filter that here -
* only WUSB 1.0.
*/
static
int hwarc_filter_cmd(struct uwb_rc *rc, struct uwb_rccb **header,
size_t *size)
{
int result = -ENOANO;
if (rc->version == 0x0100)
result = hwarc_filter_cmd_WUSB_0100(rc, header, size);
return result;
}
/**
* Compute return value as sum of incoming value and value at given offset
*
* @rceb: event for which we compute the size, it contains a variable
* length field.
* @core_size: size of the "non variable" part of the event
* @offset: place in event where the length of the variable part is stored
* @buf_size: total length of buffer in which event arrived - we need to make
* sure we read the offset in memory that is still part of the event
*/
static
ssize_t hwarc_get_event_size(struct uwb_rc *rc, const struct uwb_rceb *rceb,
size_t core_size, size_t offset,
const size_t buf_size)
{
ssize_t size = -ENOSPC;
const void *ptr = rceb;
size_t type_size = sizeof(__le16);
struct device *dev = &rc->uwb_dev.dev;
if (offset + type_size >= buf_size) {
dev_err(dev, "Not enough data to read extra size of event "
"0x%02x/%04x/%02x, only got %zu bytes.\n",
rceb->bEventType, le16_to_cpu(rceb->wEvent),
rceb->bEventContext, buf_size);
goto out;
}
ptr += offset;
size = core_size + le16_to_cpu(*(__le16 *)ptr);
out:
return size;
}
/* Beacon slot change notification (WUSB 1.0 [8.6.3.5]) */
struct uwb_rc_evt_bp_slot_change_WUSB_0100 {
struct uwb_rceb rceb;
u8 bSlotNumber;
} __attribute__((packed));
/**
* Filter data from WUSB device to WHCI driver
*
* @header: incoming event
* @buf_size: size of buffer in which event arrived
* @_event_size: actual size of event in the buffer
* @new_size: size of event after filtered
*
* We don't know how the buffer is constructed - there may be more than one
* event in it so buffer length does not determine event length. We first
* determine the expected size of the incoming event. This value is passed
* back only if the actual filtering succeeded (so we know the computed
* expected size is correct). This value will be zero if
* the event did not need any filtering.
*
* WHCI interprets the BP Slot Change event's data differently than
* WUSB. The event sizes are exactly the same. The data field
* indicates the new beacon slot in which a RC is transmitting its
* beacon. The maximum value of this is 96 (wMacBPLength ECMA-368
* 17.16 (Table 117)). We thus know that the WUSB value will not set
* the bit bNoSlot, so we don't really do anything (placeholder).
*/
static
int hwarc_filter_event_WUSB_0100(struct uwb_rc *rc, struct uwb_rceb **header,
const size_t buf_size, size_t *_real_size,
size_t *_new_size)
{
int result = -ENOANO;
struct uwb_rceb *rceb = *header;
int event = le16_to_cpu(rceb->wEvent);
ssize_t event_size;
size_t core_size, offset;
if (rceb->bEventType != UWB_RC_CET_GENERAL)
goto out;
switch (event) {
case UWB_RC_EVT_BEACON:
core_size = sizeof(struct uwb_rc_evt_beacon_WUSB_0100);
offset = offsetof(struct uwb_rc_evt_beacon_WUSB_0100,
wBeaconInfoLength);
event_size = hwarc_get_event_size(rc, rceb, core_size,
offset, buf_size);
if (event_size < 0)
goto out;
*_real_size = event_size;
result = hwarc_filter_evt_beacon_WUSB_0100(rc, header,
buf_size, _new_size);
break;
case UWB_RC_EVT_BP_SLOT_CHANGE:
*_new_size = *_real_size =
sizeof(struct uwb_rc_evt_bp_slot_change_WUSB_0100);
result = 0;
break;
case UWB_RC_EVT_DRP_AVAIL:
core_size = sizeof(struct uwb_rc_evt_drp_avail_WUSB_0100);
offset = offsetof(struct uwb_rc_evt_drp_avail_WUSB_0100,
wIELength);
event_size = hwarc_get_event_size(rc, rceb, core_size,
offset, buf_size);
if (event_size < 0)
goto out;
*_real_size = event_size;
result = hwarc_filter_evt_drp_avail_WUSB_0100(
rc, header, buf_size, _new_size);
break;
case UWB_RC_EVT_DRP:
core_size = sizeof(struct uwb_rc_evt_drp_WUSB_0100);
offset = offsetof(struct uwb_rc_evt_drp_WUSB_0100, wIELength);
event_size = hwarc_get_event_size(rc, rceb, core_size,
offset, buf_size);
if (event_size < 0)
goto out;
*_real_size = event_size;
result = hwarc_filter_evt_drp_WUSB_0100(rc, header,
buf_size, _new_size);
break;
default:
break;
}
out:
return result;
}
/**
* Filter data from WUSB device to WHCI driver
*
* @header: incoming event
* @buf_size: size of buffer in which event arrived
* @_event_size: actual size of event in the buffer
* @_new_size: size of event after filtered
*
* Filter events based on which protocol the device supports. The WUSB
* errata should be the same as WHCI 0.95 so we do not filter that here -
* only WUSB 1.0.
*
* If we don't handle it, we return -ENOANO (why the weird error code?
* well, so if I get it, I can pinpoint in the code that raised
* it...after all, not too many places use the higher error codes).
*/
static
int hwarc_filter_event(struct uwb_rc *rc, struct uwb_rceb **header,
const size_t buf_size, size_t *_real_size,
size_t *_new_size)
{
int result = -ENOANO;
if (rc->version == 0x0100)
result = hwarc_filter_event_WUSB_0100(
rc, header, buf_size, _real_size, _new_size);
return result;
}
/**
* Execute an UWB RC command on HWA
*
* @rc: Instance of a Radio Controller that is a HWA
* @cmd: Buffer containing the RCCB and payload to execute
* @cmd_size: Size of the command buffer.
*
* NOTE: rc's mutex has to be locked
*/
static
int hwarc_cmd(struct uwb_rc *uwb_rc, const struct uwb_rccb *cmd, size_t cmd_size)
{
struct hwarc *hwarc = uwb_rc->priv;
return usb_control_msg(
hwarc->usb_dev, usb_sndctrlpipe(hwarc->usb_dev, 0),
WA_EXEC_RC_CMD, USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, hwarc->usb_iface->cur_altsetting->desc.bInterfaceNumber,
(void *) cmd, cmd_size, 100 /* FIXME: this is totally arbitrary */);
}
static
int hwarc_reset(struct uwb_rc *uwb_rc)
{
struct hwarc *hwarc = uwb_rc->priv;
int result;
/* device lock must be held when calling usb_reset_device. */
result = usb_lock_device_for_reset(hwarc->usb_dev, NULL);
if (result >= 0) {
result = usb_reset_device(hwarc->usb_dev);
usb_unlock_device(hwarc->usb_dev);
}
return result;
}
/**
* Callback for the notification and event endpoint
*
* Check's that everything is fine and then passes the read data to
* the notification/event handling mechanism (neh).
*/
static
void hwarc_neep_cb(struct urb *urb)
{
struct hwarc *hwarc = urb->context;
struct usb_interface *usb_iface = hwarc->usb_iface;
struct device *dev = &usb_iface->dev;
int result;
switch (result = urb->status) {
case 0:
uwb_rc_neh_grok(hwarc->uwb_rc, urb->transfer_buffer,
urb->actual_length);
break;
case -ECONNRESET: /* Not an error, but a controlled situation; */
case -ENOENT: /* (we killed the URB)...so, no broadcast */
goto out;
case -ESHUTDOWN: /* going away! */
goto out;
default: /* On general errors, retry unless it gets ugly */
if (edc_inc(&hwarc->neep_edc, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME))
goto error_exceeded;
dev_err(dev, "NEEP: URB error %d\n", urb->status);
}
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result < 0 && result != -ENODEV && result != -EPERM) {
/* ignoring unrecoverable errors */
dev_err(dev, "NEEP: Can't resubmit URB (%d) resetting device\n",
result);
goto error;
}
out:
return;
error_exceeded:
dev_err(dev, "NEEP: URB max acceptable errors "
"exceeded, resetting device\n");
error:
uwb_rc_neh_error(hwarc->uwb_rc, result);
uwb_rc_reset_all(hwarc->uwb_rc);
return;
}
static void hwarc_init(struct hwarc *hwarc)
{
edc_init(&hwarc->neep_edc);
}
/**
* Initialize the notification/event endpoint stuff
*
* Note this is effectively a parallel thread; it knows that
* hwarc->uwb_rc always exists because the existence of a 'hwarc'
* means that there is a reverence on the hwarc->uwb_rc (see
* _probe()), and thus _neep_cb() can execute safely.
*/
static int hwarc_neep_init(struct uwb_rc *rc)
{
struct hwarc *hwarc = rc->priv;
struct usb_interface *iface = hwarc->usb_iface;
struct usb_device *usb_dev = interface_to_usbdev(iface);
struct device *dev = &iface->dev;
int result;
struct usb_endpoint_descriptor *epd;
epd = &iface->cur_altsetting->endpoint[0].desc;
hwarc->rd_buffer = (void *) __get_free_page(GFP_KERNEL);
if (hwarc->rd_buffer == NULL) {
dev_err(dev, "Unable to allocate notification's read buffer\n");
goto error_rd_buffer;
}
hwarc->neep_urb = usb_alloc_urb(0, GFP_KERNEL);
if (hwarc->neep_urb == NULL)
goto error_urb_alloc;
usb_fill_int_urb(hwarc->neep_urb, usb_dev,
usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
hwarc->rd_buffer, PAGE_SIZE,
hwarc_neep_cb, hwarc, epd->bInterval);
result = usb_submit_urb(hwarc->neep_urb, GFP_ATOMIC);
if (result < 0) {
dev_err(dev, "Cannot submit notification URB: %d\n", result);
goto error_neep_submit;
}
return 0;
error_neep_submit:
usb_free_urb(hwarc->neep_urb);
hwarc->neep_urb = NULL;
error_urb_alloc:
free_page((unsigned long)hwarc->rd_buffer);
hwarc->rd_buffer = NULL;
error_rd_buffer:
return -ENOMEM;
}
/** Clean up all the notification endpoint resources */
static void hwarc_neep_release(struct uwb_rc *rc)
{
struct hwarc *hwarc = rc->priv;
usb_kill_urb(hwarc->neep_urb);
usb_free_urb(hwarc->neep_urb);
hwarc->neep_urb = NULL;
free_page((unsigned long)hwarc->rd_buffer);
hwarc->rd_buffer = NULL;
}
/**
* Get the version from class-specific descriptor
*
* NOTE: this descriptor comes with the big bundled configuration
* descriptor that includes the interfaces' and endpoints', so
* we just look for it in the cached copy kept by the USB stack.
*
* NOTE2: We convert LE fields to CPU order.
*/
static int hwarc_get_version(struct uwb_rc *rc)
{
int result;
struct hwarc *hwarc = rc->priv;
struct uwb_rc_control_intf_class_desc *descr;
struct device *dev = &rc->uwb_dev.dev;
struct usb_device *usb_dev = hwarc->usb_dev;
char *itr;
struct usb_descriptor_header *hdr;
size_t itr_size, actconfig_idx;
u16 version;
actconfig_idx = (usb_dev->actconfig - usb_dev->config) /
sizeof(usb_dev->config[0]);
itr = usb_dev->rawdescriptors[actconfig_idx];
itr_size = le16_to_cpu(usb_dev->actconfig->desc.wTotalLength);
while (itr_size >= sizeof(*hdr)) {
hdr = (struct usb_descriptor_header *) itr;
dev_dbg(dev, "Extra device descriptor: "
"type %02x/%u bytes @ %zu (%zu left)\n",
hdr->bDescriptorType, hdr->bLength,
(itr - usb_dev->rawdescriptors[actconfig_idx]),
itr_size);
if (hdr->bDescriptorType == USB_DT_CS_RADIO_CONTROL)
goto found;
itr += hdr->bLength;
itr_size -= hdr->bLength;
}
dev_err(dev, "cannot find Radio Control Interface Class descriptor\n");
return -ENODEV;
found:
result = -EINVAL;
if (hdr->bLength > itr_size) { /* is it available? */
dev_err(dev, "incomplete Radio Control Interface Class "
"descriptor (%zu bytes left, %u needed)\n",
itr_size, hdr->bLength);
goto error;
}
if (hdr->bLength < sizeof(*descr)) {
dev_err(dev, "short Radio Control Interface Class "
"descriptor\n");
goto error;
}
descr = (struct uwb_rc_control_intf_class_desc *) hdr;
/* Make LE fields CPU order */
version = __le16_to_cpu(descr->bcdRCIVersion);
if (version != 0x0100) {
dev_err(dev, "Device reports protocol version 0x%04x. We "
"do not support that. \n", version);
result = -EINVAL;
goto error;
}
rc->version = version;
dev_dbg(dev, "Device supports WUSB protocol version 0x%04x \n", rc->version);
result = 0;
error:
return result;
}
/*
* By creating a 'uwb_rc', we have a reference on it -- that reference
* is the one we drop when we disconnect.
*
* No need to switch altsettings; according to WUSB1.0[8.6.1.1], there
* is only one altsetting allowed.
*/
static int hwarc_probe(struct usb_interface *iface,
const struct usb_device_id *id)
{
int result;
struct uwb_rc *uwb_rc;
struct hwarc *hwarc;
struct device *dev = &iface->dev;
if (iface->cur_altsetting->desc.bNumEndpoints < 1)
return -ENODEV;
if (!usb_endpoint_xfer_int(&iface->cur_altsetting->endpoint[0].desc))
return -ENODEV;
result = -ENOMEM;
uwb_rc = uwb_rc_alloc();
if (uwb_rc == NULL) {
dev_err(dev, "unable to allocate RC instance\n");
goto error_rc_alloc;
}
hwarc = kzalloc(sizeof(*hwarc), GFP_KERNEL);
if (hwarc == NULL) {
dev_err(dev, "unable to allocate HWA RC instance\n");
goto error_alloc;
}
hwarc_init(hwarc);
hwarc->usb_dev = usb_get_dev(interface_to_usbdev(iface));
hwarc->usb_iface = usb_get_intf(iface);
hwarc->uwb_rc = uwb_rc;
uwb_rc->owner = THIS_MODULE;
uwb_rc->start = hwarc_neep_init;
uwb_rc->stop = hwarc_neep_release;
uwb_rc->cmd = hwarc_cmd;
uwb_rc->reset = hwarc_reset;
if (id->driver_info & WUSB_QUIRK_WHCI_CMD_EVT) {
uwb_rc->filter_cmd = NULL;
uwb_rc->filter_event = NULL;
} else {
uwb_rc->filter_cmd = hwarc_filter_cmd;
uwb_rc->filter_event = hwarc_filter_event;
}
result = uwb_rc_add(uwb_rc, dev, hwarc);
if (result < 0)
goto error_rc_add;
result = hwarc_get_version(uwb_rc);
if (result < 0) {
dev_err(dev, "cannot retrieve version of RC \n");
goto error_get_version;
}
usb_set_intfdata(iface, hwarc);
return 0;
error_get_version:
uwb_rc_rm(uwb_rc);
error_rc_add:
usb_put_intf(iface);
usb_put_dev(hwarc->usb_dev);
kfree(hwarc);
error_alloc:
uwb_rc_put(uwb_rc);
error_rc_alloc:
return result;
}
static void hwarc_disconnect(struct usb_interface *iface)
{
struct hwarc *hwarc = usb_get_intfdata(iface);
struct uwb_rc *uwb_rc = hwarc->uwb_rc;
usb_set_intfdata(hwarc->usb_iface, NULL);
uwb_rc_rm(uwb_rc);
usb_put_intf(hwarc->usb_iface);
usb_put_dev(hwarc->usb_dev);
kfree(hwarc);
uwb_rc_put(uwb_rc); /* when creating the device, refcount = 1 */
}
static int hwarc_pre_reset(struct usb_interface *iface)
{
struct hwarc *hwarc = usb_get_intfdata(iface);
struct uwb_rc *uwb_rc = hwarc->uwb_rc;
uwb_rc_pre_reset(uwb_rc);
return 0;
}
static int hwarc_post_reset(struct usb_interface *iface)
{
struct hwarc *hwarc = usb_get_intfdata(iface);
struct uwb_rc *uwb_rc = hwarc->uwb_rc;
return uwb_rc_post_reset(uwb_rc);
}
/** USB device ID's that we handle */
static const struct usb_device_id hwarc_id_table[] = {
/* D-Link DUB-1210 */
{ USB_DEVICE_AND_INTERFACE_INFO(0x07d1, 0x3d02, 0xe0, 0x01, 0x02),
.driver_info = WUSB_QUIRK_WHCI_CMD_EVT },
/* Intel i1480 (using firmware 1.3PA2-20070828) */
{ USB_DEVICE_AND_INTERFACE_INFO(0x8086, 0x0c3b, 0xe0, 0x01, 0x02),
.driver_info = WUSB_QUIRK_WHCI_CMD_EVT },
/* Alereon 5310 */
{ USB_DEVICE_AND_INTERFACE_INFO(0x13dc, 0x5310, 0xe0, 0x01, 0x02),
.driver_info = WUSB_QUIRK_WHCI_CMD_EVT },
/* Alereon 5611 */
{ USB_DEVICE_AND_INTERFACE_INFO(0x13dc, 0x5611, 0xe0, 0x01, 0x02),
.driver_info = WUSB_QUIRK_WHCI_CMD_EVT },
/* Generic match for the Radio Control interface */
{ USB_INTERFACE_INFO(0xe0, 0x01, 0x02), },
{ },
};
MODULE_DEVICE_TABLE(usb, hwarc_id_table);
static struct usb_driver hwarc_driver = {
.name = "hwa-rc",
.id_table = hwarc_id_table,
.probe = hwarc_probe,
.disconnect = hwarc_disconnect,
.pre_reset = hwarc_pre_reset,
.post_reset = hwarc_post_reset,
};
module_usb_driver(hwarc_driver);
MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
MODULE_DESCRIPTION("Host Wireless Adapter Radio Control Driver");
MODULE_LICENSE("GPL");