// SPDX-License-Identifier: GPL-2.0 /* * WUSB Wire Adapter: Control/Data Streaming Interface (WUSB[8]) * Device Connect handling * * Copyright (C) 2006 Intel Corporation * Inaky Perez-Gonzalez * * FIXME: docs * FIXME: this file needs to be broken up, it's grown too big * * * WUSB1.0[7.1, 7.5.1, ] * * WUSB device connection is kind of messy. Some background: * * When a device wants to connect it scans the UWB radio channels * looking for a WUSB Channel; a WUSB channel is defined by MMCs * (Micro Managed Commands or something like that) [see * Design-overview for more on this] . * * So, device scans the radio, finds MMCs and thus a host and checks * when the next DNTS is. It sends a Device Notification Connect * (DN_Connect); the host picks it up (through nep.c and notif.c, ends * up in wusb_devconnect_ack(), which creates a wusb_dev structure in * wusbhc->port[port_number].wusb_dev), assigns an unauth address * to the device (this means from 0x80 to 0xfe) and sends, in the MMC * a Connect Ack Information Element (ConnAck IE). * * So now the device now has a WUSB address. From now on, we use * that to talk to it in the RPipes. * * ASSUMPTIONS: * * - We use the the as device address the port number where it is * connected (port 0 doesn't exist). For unauth, it is 128 + that. * * ROADMAP: * * This file contains the logic for doing that--entry points: * * wusb_devconnect_ack() Ack a device until _acked() called. * Called by notif.c:wusb_handle_dn_connect() * when a DN_Connect is received. * * wusb_devconnect_acked() Ack done, release resources. * * wusb_handle_dn_alive() Called by notif.c:wusb_handle_dn() * for processing a DN_Alive pong from a device. * * wusb_handle_dn_disconnect()Called by notif.c:wusb_handle_dn() to * process a disconenct request from a * device. * * __wusb_dev_disable() Called by rh.c:wusbhc_rh_clear_port_feat() when * disabling a port. * * wusb_devconnect_create() Called when creating the host by * lc.c:wusbhc_create(). * * wusb_devconnect_destroy() Cleanup called removing the host. Called * by lc.c:wusbhc_destroy(). * * Each Wireless USB host maintains a list of DN_Connect requests * (actually we maintain a list of pending Connect Acks, the * wusbhc->ca_list). * * LIFE CYCLE OF port->wusb_dev * * Before the @wusbhc structure put()s the reference it owns for * port->wusb_dev [and clean the wusb_dev pointer], it needs to * lock @wusbhc->mutex. */ #include #include #include #include #include #include "wusbhc.h" static void wusbhc_devconnect_acked_work(struct work_struct *work); static void wusb_dev_free(struct wusb_dev *wusb_dev) { kfree(wusb_dev); } static struct wusb_dev *wusb_dev_alloc(struct wusbhc *wusbhc) { struct wusb_dev *wusb_dev; wusb_dev = kzalloc(sizeof(*wusb_dev), GFP_KERNEL); if (wusb_dev == NULL) goto err; wusb_dev->wusbhc = wusbhc; INIT_WORK(&wusb_dev->devconnect_acked_work, wusbhc_devconnect_acked_work); return wusb_dev; err: wusb_dev_free(wusb_dev); return NULL; } /* * Using the Connect-Ack list, fill out the @wusbhc Connect-Ack WUSB IE * properly so that it can be added to the MMC. * * We just get the @wusbhc->ca_list and fill out the first four ones or * less (per-spec WUSB1.0[7.5, before T7-38). If the ConnectAck WUSB * IE is not allocated, we alloc it. * * @wusbhc->mutex must be taken */ static void wusbhc_fill_cack_ie(struct wusbhc *wusbhc) { unsigned cnt; struct wusb_dev *dev_itr; struct wuie_connect_ack *cack_ie; cack_ie = &wusbhc->cack_ie; cnt = 0; list_for_each_entry(dev_itr, &wusbhc->cack_list, cack_node) { cack_ie->blk[cnt].CDID = dev_itr->cdid; cack_ie->blk[cnt].bDeviceAddress = dev_itr->addr; if (++cnt >= WUIE_ELT_MAX) break; } cack_ie->hdr.bLength = sizeof(cack_ie->hdr) + cnt * sizeof(cack_ie->blk[0]); } /* * Register a new device that wants to connect * * A new device wants to connect, so we add it to the Connect-Ack * list. We give it an address in the unauthorized range (bit 8 set); * user space will have to drive authorization further on. * * @dev_addr: address to use for the device (which is also the port * number). * * @wusbhc->mutex must be taken */ static struct wusb_dev *wusbhc_cack_add(struct wusbhc *wusbhc, struct wusb_dn_connect *dnc, const char *pr_cdid, u8 port_idx) { struct device *dev = wusbhc->dev; struct wusb_dev *wusb_dev; int new_connection = wusb_dn_connect_new_connection(dnc); u8 dev_addr; int result; /* Is it registered already? */ list_for_each_entry(wusb_dev, &wusbhc->cack_list, cack_node) if (!memcmp(&wusb_dev->cdid, &dnc->CDID, sizeof(wusb_dev->cdid))) return wusb_dev; /* We don't have it, create an entry, register it */ wusb_dev = wusb_dev_alloc(wusbhc); if (wusb_dev == NULL) return NULL; wusb_dev_init(wusb_dev); wusb_dev->cdid = dnc->CDID; wusb_dev->port_idx = port_idx; /* * Devices are always available within the cluster reservation * and since the hardware will take the intersection of the * per-device availability and the cluster reservation, the * per-device availability can simply be set to always * available. */ bitmap_fill(wusb_dev->availability.bm, UWB_NUM_MAS); /* FIXME: handle reconnects instead of assuming connects are always new. */ if (1 && new_connection == 0) new_connection = 1; if (new_connection) { dev_addr = (port_idx + 2) | WUSB_DEV_ADDR_UNAUTH; dev_info(dev, "Connecting new WUSB device to address %u, " "port %u\n", dev_addr, port_idx); result = wusb_set_dev_addr(wusbhc, wusb_dev, dev_addr); if (result < 0) return NULL; } wusb_dev->entry_ts = jiffies; list_add_tail(&wusb_dev->cack_node, &wusbhc->cack_list); wusbhc->cack_count++; wusbhc_fill_cack_ie(wusbhc); return wusb_dev; } /* * Remove a Connect-Ack context entry from the HCs view * * @wusbhc->mutex must be taken */ static void wusbhc_cack_rm(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) { list_del_init(&wusb_dev->cack_node); wusbhc->cack_count--; wusbhc_fill_cack_ie(wusbhc); } /* * @wusbhc->mutex must be taken */ static void wusbhc_devconnect_acked(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) { wusbhc_cack_rm(wusbhc, wusb_dev); if (wusbhc->cack_count) wusbhc_mmcie_set(wusbhc, 0, 0, &wusbhc->cack_ie.hdr); else wusbhc_mmcie_rm(wusbhc, &wusbhc->cack_ie.hdr); } static void wusbhc_devconnect_acked_work(struct work_struct *work) { struct wusb_dev *wusb_dev = container_of(work, struct wusb_dev, devconnect_acked_work); struct wusbhc *wusbhc = wusb_dev->wusbhc; mutex_lock(&wusbhc->mutex); wusbhc_devconnect_acked(wusbhc, wusb_dev); mutex_unlock(&wusbhc->mutex); wusb_dev_put(wusb_dev); } /* * Ack a device for connection * * FIXME: docs * * @pr_cdid: Printable CDID...hex Use @dnc->cdid for the real deal. * * So we get the connect ack IE (may have been allocated already), * find an empty connect block, an empty virtual port, create an * address with it (see below), make it an unauth addr [bit 7 set] and * set the MMC. * * Addresses: because WUSB hosts have no downstream hubs, we can do a * 1:1 mapping between 'port number' and device * address. This simplifies many things, as during this * initial connect phase the USB stack has no knowledge of * the device and hasn't assigned an address yet--we know * USB's choose_address() will use the same heuristics we * use here, so we can assume which address will be assigned. * * USB stack always assigns address 1 to the root hub, so * to the port number we add 2 (thus virtual port #0 is * addr #2). * * @wusbhc shall be referenced */ static void wusbhc_devconnect_ack(struct wusbhc *wusbhc, struct wusb_dn_connect *dnc, const char *pr_cdid) { int result; struct device *dev = wusbhc->dev; struct wusb_dev *wusb_dev; struct wusb_port *port; unsigned idx; mutex_lock(&wusbhc->mutex); /* Check we are not handling it already */ for (idx = 0; idx < wusbhc->ports_max; idx++) { port = wusb_port_by_idx(wusbhc, idx); if (port->wusb_dev && memcmp(&dnc->CDID, &port->wusb_dev->cdid, sizeof(dnc->CDID)) == 0) goto error_unlock; } /* Look up those fake ports we have for a free one */ for (idx = 0; idx < wusbhc->ports_max; idx++) { port = wusb_port_by_idx(wusbhc, idx); if ((port->status & USB_PORT_STAT_POWER) && !(port->status & USB_PORT_STAT_CONNECTION)) break; } if (idx >= wusbhc->ports_max) { dev_err(dev, "Host controller can't connect more devices " "(%u already connected); device %s rejected\n", wusbhc->ports_max, pr_cdid); /* NOTE: we could send a WUIE_Disconnect here, but we haven't * event acked, so the device will eventually timeout the * connection, right? */ goto error_unlock; } /* Make sure we are using no crypto on that "virtual port" */ wusbhc->set_ptk(wusbhc, idx, 0, NULL, 0); /* Grab a filled in Connect-Ack context, fill out the * Connect-Ack Wireless USB IE, set the MMC */ wusb_dev = wusbhc_cack_add(wusbhc, dnc, pr_cdid, idx); if (wusb_dev == NULL) goto error_unlock; result = wusbhc_mmcie_set(wusbhc, 0, 0, &wusbhc->cack_ie.hdr); if (result < 0) goto error_unlock; /* Give the device at least 2ms (WUSB1.0[7.5.1p3]), let's do * three for a good measure */ msleep(3); port->wusb_dev = wusb_dev; port->status |= USB_PORT_STAT_CONNECTION; port->change |= USB_PORT_STAT_C_CONNECTION; /* Now the port status changed to connected; hub_wq will * pick the change up and try to reset the port to bring it to * the enabled state--so this process returns up to the stack * and it calls back into wusbhc_rh_port_reset(). */ error_unlock: mutex_unlock(&wusbhc->mutex); return; } /* * Disconnect a Wireless USB device from its fake port * * Marks the port as disconnected so that hub_wq can pick up the change * and drops our knowledge about the device. * * Assumes there is a device connected * * @port_index: zero based port number * * NOTE: @wusbhc->mutex is locked * * WARNING: From here it is not very safe to access anything hanging off * wusb_dev */ static void __wusbhc_dev_disconnect(struct wusbhc *wusbhc, struct wusb_port *port) { struct wusb_dev *wusb_dev = port->wusb_dev; port->status &= ~(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | USB_PORT_STAT_SUSPEND | USB_PORT_STAT_RESET | USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED); port->change |= USB_PORT_STAT_C_CONNECTION | USB_PORT_STAT_C_ENABLE; if (wusb_dev) { dev_dbg(wusbhc->dev, "disconnecting device from port %d\n", wusb_dev->port_idx); if (!list_empty(&wusb_dev->cack_node)) list_del_init(&wusb_dev->cack_node); /* For the one in cack_add() */ wusb_dev_put(wusb_dev); } port->wusb_dev = NULL; /* After a device disconnects, change the GTK (see [WUSB] * section 6.2.11.2). */ if (wusbhc->active) wusbhc_gtk_rekey(wusbhc); /* The Wireless USB part has forgotten about the device already; now * hub_wq's timer will pick up the disconnection and remove the USB * device from the system */ } /* * Refresh the list of keep alives to emit in the MMC * * We only publish the first four devices that have a coming timeout * condition. Then when we are done processing those, we go for the * next ones. We ignore the ones that have timed out already (they'll * be purged). * * This might cause the first devices to timeout the last devices in * the port array...FIXME: come up with a better algorithm? * * Note we can't do much about MMC's ops errors; we hope next refresh * will kind of handle it. * * NOTE: @wusbhc->mutex is locked */ static void __wusbhc_keep_alive(struct wusbhc *wusbhc) { struct device *dev = wusbhc->dev; unsigned cnt; struct wusb_dev *wusb_dev; struct wusb_port *wusb_port; struct wuie_keep_alive *ie = &wusbhc->keep_alive_ie; unsigned keep_alives, old_keep_alives; old_keep_alives = ie->hdr.bLength - sizeof(ie->hdr); keep_alives = 0; for (cnt = 0; keep_alives < WUIE_ELT_MAX && cnt < wusbhc->ports_max; cnt++) { unsigned tt = msecs_to_jiffies(wusbhc->trust_timeout); wusb_port = wusb_port_by_idx(wusbhc, cnt); wusb_dev = wusb_port->wusb_dev; if (wusb_dev == NULL) continue; if (wusb_dev->usb_dev == NULL) continue; if (time_after(jiffies, wusb_dev->entry_ts + tt)) { dev_err(dev, "KEEPALIVE: device %u timed out\n", wusb_dev->addr); __wusbhc_dev_disconnect(wusbhc, wusb_port); } else if (time_after(jiffies, wusb_dev->entry_ts + tt/3)) { /* Approaching timeout cut off, need to refresh */ ie->bDeviceAddress[keep_alives++] = wusb_dev->addr; } } if (keep_alives & 0x1) /* pad to even number ([WUSB] section 7.5.9) */ ie->bDeviceAddress[keep_alives++] = 0x7f; ie->hdr.bLength = sizeof(ie->hdr) + keep_alives*sizeof(ie->bDeviceAddress[0]); if (keep_alives > 0) wusbhc_mmcie_set(wusbhc, 10, 5, &ie->hdr); else if (old_keep_alives != 0) wusbhc_mmcie_rm(wusbhc, &ie->hdr); } /* * Do a run through all devices checking for timeouts */ static void wusbhc_keep_alive_run(struct work_struct *ws) { struct delayed_work *dw = to_delayed_work(ws); struct wusbhc *wusbhc = container_of(dw, struct wusbhc, keep_alive_timer); mutex_lock(&wusbhc->mutex); __wusbhc_keep_alive(wusbhc); mutex_unlock(&wusbhc->mutex); queue_delayed_work(wusbd, &wusbhc->keep_alive_timer, msecs_to_jiffies(wusbhc->trust_timeout / 2)); } /* * Find the wusb_dev from its device address. * * The device can be found directly from the address (see * wusb_cack_add() for where the device address is set to port_idx * +2), except when the address is zero. */ static struct wusb_dev *wusbhc_find_dev_by_addr(struct wusbhc *wusbhc, u8 addr) { int p; if (addr == 0xff) /* unconnected */ return NULL; if (addr > 0) { int port = (addr & ~0x80) - 2; if (port < 0 || port >= wusbhc->ports_max) return NULL; return wusb_port_by_idx(wusbhc, port)->wusb_dev; } /* Look for the device with address 0. */ for (p = 0; p < wusbhc->ports_max; p++) { struct wusb_dev *wusb_dev = wusb_port_by_idx(wusbhc, p)->wusb_dev; if (wusb_dev && wusb_dev->addr == addr) return wusb_dev; } return NULL; } /* * Handle a DN_Alive notification (WUSB1.0[7.6.1]) * * This just updates the device activity timestamp and then refreshes * the keep alive IE. * * @wusbhc shall be referenced and unlocked */ static void wusbhc_handle_dn_alive(struct wusbhc *wusbhc, u8 srcaddr) { struct wusb_dev *wusb_dev; mutex_lock(&wusbhc->mutex); wusb_dev = wusbhc_find_dev_by_addr(wusbhc, srcaddr); if (wusb_dev == NULL) { dev_dbg(wusbhc->dev, "ignoring DN_Alive from unconnected device %02x\n", srcaddr); } else { wusb_dev->entry_ts = jiffies; __wusbhc_keep_alive(wusbhc); } mutex_unlock(&wusbhc->mutex); } /* * Handle a DN_Connect notification (WUSB1.0[7.6.1]) * * @wusbhc * @pkt_hdr * @size: Size of the buffer where the notification resides; if the * notification data suggests there should be more data than * available, an error will be signaled and the whole buffer * consumed. * * @wusbhc->mutex shall be held */ static void wusbhc_handle_dn_connect(struct wusbhc *wusbhc, struct wusb_dn_hdr *dn_hdr, size_t size) { struct device *dev = wusbhc->dev; struct wusb_dn_connect *dnc; char pr_cdid[WUSB_CKHDID_STRSIZE]; static const char *beacon_behaviour[] = { "reserved", "self-beacon", "directed-beacon", "no-beacon" }; if (size < sizeof(*dnc)) { dev_err(dev, "DN CONNECT: short notification (%zu < %zu)\n", size, sizeof(*dnc)); return; } dnc = container_of(dn_hdr, struct wusb_dn_connect, hdr); sprintf(pr_cdid, "%16ph", dnc->CDID.data); dev_info(dev, "DN CONNECT: device %s @ %x (%s) wants to %s\n", pr_cdid, wusb_dn_connect_prev_dev_addr(dnc), beacon_behaviour[wusb_dn_connect_beacon_behavior(dnc)], wusb_dn_connect_new_connection(dnc) ? "connect" : "reconnect"); /* ACK the connect */ wusbhc_devconnect_ack(wusbhc, dnc, pr_cdid); } /* * Handle a DN_Disconnect notification (WUSB1.0[7.6.1]) * * Device is going down -- do the disconnect. * * @wusbhc shall be referenced and unlocked */ static void wusbhc_handle_dn_disconnect(struct wusbhc *wusbhc, u8 srcaddr) { struct device *dev = wusbhc->dev; struct wusb_dev *wusb_dev; mutex_lock(&wusbhc->mutex); wusb_dev = wusbhc_find_dev_by_addr(wusbhc, srcaddr); if (wusb_dev == NULL) { dev_dbg(dev, "ignoring DN DISCONNECT from unconnected device %02x\n", srcaddr); } else { dev_info(dev, "DN DISCONNECT: device 0x%02x going down\n", wusb_dev->addr); __wusbhc_dev_disconnect(wusbhc, wusb_port_by_idx(wusbhc, wusb_dev->port_idx)); } mutex_unlock(&wusbhc->mutex); } /* * Handle a Device Notification coming a host * * The Device Notification comes from a host (HWA, DWA or WHCI) * wrapped in a set of headers. Somebody else has peeled off those * headers for us and we just get one Device Notifications. * * Invalid DNs (e.g., too short) are discarded. * * @wusbhc shall be referenced * * FIXMES: * - implement priorities as in WUSB1.0[Table 7-55]? */ void wusbhc_handle_dn(struct wusbhc *wusbhc, u8 srcaddr, struct wusb_dn_hdr *dn_hdr, size_t size) { struct device *dev = wusbhc->dev; if (size < sizeof(struct wusb_dn_hdr)) { dev_err(dev, "DN data shorter than DN header (%d < %d)\n", (int)size, (int)sizeof(struct wusb_dn_hdr)); return; } switch (dn_hdr->bType) { case WUSB_DN_CONNECT: wusbhc_handle_dn_connect(wusbhc, dn_hdr, size); break; case WUSB_DN_ALIVE: wusbhc_handle_dn_alive(wusbhc, srcaddr); break; case WUSB_DN_DISCONNECT: wusbhc_handle_dn_disconnect(wusbhc, srcaddr); break; case WUSB_DN_MASAVAILCHANGED: case WUSB_DN_RWAKE: case WUSB_DN_SLEEP: /* FIXME: handle these DNs. */ break; case WUSB_DN_EPRDY: /* The hardware handles these. */ break; default: dev_warn(dev, "unknown DN %u (%d octets) from %u\n", dn_hdr->bType, (int)size, srcaddr); } } EXPORT_SYMBOL_GPL(wusbhc_handle_dn); /* * Disconnect a WUSB device from a the cluster * * @wusbhc * @port Fake port where the device is (wusbhc index, not USB port number). * * In Wireless USB, a disconnect is basically telling the device he is * being disconnected and forgetting about him. * * We send the device a Device Disconnect IE (WUSB1.0[7.5.11]) for 100 * ms and then keep going. * * We don't do much in case of error; we always pretend we disabled * the port and disconnected the device. If physically the request * didn't get there (many things can fail in the way there), the stack * will reject the device's communication attempts. * * @wusbhc should be refcounted and locked */ void __wusbhc_dev_disable(struct wusbhc *wusbhc, u8 port_idx) { int result; struct device *dev = wusbhc->dev; struct wusb_dev *wusb_dev; struct wuie_disconnect *ie; wusb_dev = wusb_port_by_idx(wusbhc, port_idx)->wusb_dev; if (wusb_dev == NULL) { /* reset no device? ignore */ dev_dbg(dev, "DISCONNECT: no device at port %u, ignoring\n", port_idx); return; } __wusbhc_dev_disconnect(wusbhc, wusb_port_by_idx(wusbhc, port_idx)); ie = kzalloc(sizeof(*ie), GFP_KERNEL); if (ie == NULL) return; ie->hdr.bLength = sizeof(*ie); ie->hdr.bIEIdentifier = WUIE_ID_DEVICE_DISCONNECT; ie->bDeviceAddress = wusb_dev->addr; result = wusbhc_mmcie_set(wusbhc, 0, 0, &ie->hdr); if (result < 0) dev_err(dev, "DISCONNECT: can't set MMC: %d\n", result); else { /* At least 6 MMCs, assuming at least 1 MMC per zone. */ msleep(7*4); wusbhc_mmcie_rm(wusbhc, &ie->hdr); } kfree(ie); } /* * Walk over the BOS descriptor, verify and grok it * * @usb_dev: referenced * @wusb_dev: referenced and unlocked * * The BOS descriptor is defined at WUSB1.0[7.4.1], and it defines a * "flexible" way to wrap all kinds of descriptors inside an standard * descriptor (wonder why they didn't use normal descriptors, * btw). Not like they lack code. * * At the end we go to look for the WUSB Device Capabilities * (WUSB1.0[7.4.1.1]) that is wrapped in a device capability descriptor * that is part of the BOS descriptor set. That tells us what does the * device support (dual role, beacon type, UWB PHY rates). */ static int wusb_dev_bos_grok(struct usb_device *usb_dev, struct wusb_dev *wusb_dev, struct usb_bos_descriptor *bos, size_t desc_size) { ssize_t result; struct device *dev = &usb_dev->dev; void *itr, *top; /* Walk over BOS capabilities, verify them */ itr = (void *)bos + sizeof(*bos); top = itr + desc_size - sizeof(*bos); while (itr < top) { struct usb_dev_cap_header *cap_hdr = itr; size_t cap_size; u8 cap_type; if (top - itr < sizeof(*cap_hdr)) { dev_err(dev, "Device BUG? premature end of BOS header " "data [offset 0x%02x]: only %zu bytes left\n", (int)(itr - (void *)bos), top - itr); result = -ENOSPC; goto error_bad_cap; } cap_size = cap_hdr->bLength; cap_type = cap_hdr->bDevCapabilityType; if (cap_size == 0) break; if (cap_size > top - itr) { dev_err(dev, "Device BUG? premature end of BOS data " "[offset 0x%02x cap %02x %zu bytes]: " "only %zu bytes left\n", (int)(itr - (void *)bos), cap_type, cap_size, top - itr); result = -EBADF; goto error_bad_cap; } switch (cap_type) { case USB_CAP_TYPE_WIRELESS_USB: if (cap_size != sizeof(*wusb_dev->wusb_cap_descr)) dev_err(dev, "Device BUG? WUSB Capability " "descriptor is %zu bytes vs %zu " "needed\n", cap_size, sizeof(*wusb_dev->wusb_cap_descr)); else wusb_dev->wusb_cap_descr = itr; break; default: dev_err(dev, "BUG? Unknown BOS capability 0x%02x " "(%zu bytes) at offset 0x%02x\n", cap_type, cap_size, (int)(itr - (void *)bos)); } itr += cap_size; } result = 0; error_bad_cap: return result; } /* * Add information from the BOS descriptors to the device * * @usb_dev: referenced * @wusb_dev: referenced and unlocked * * So what we do is we alloc a space for the BOS descriptor of 64 * bytes; read the first four bytes which include the wTotalLength * field (WUSB1.0[T7-26]) and if it fits in those 64 bytes, read the * whole thing. If not we realloc to that size. * * Then we call the groking function, that will fill up * wusb_dev->wusb_cap_descr, which is what we'll need later on. */ static int wusb_dev_bos_add(struct usb_device *usb_dev, struct wusb_dev *wusb_dev) { ssize_t result; struct device *dev = &usb_dev->dev; struct usb_bos_descriptor *bos; size_t alloc_size = 32, desc_size = 4; bos = kmalloc(alloc_size, GFP_KERNEL); if (bos == NULL) return -ENOMEM; result = usb_get_descriptor(usb_dev, USB_DT_BOS, 0, bos, desc_size); if (result < 4) { dev_err(dev, "Can't get BOS descriptor or too short: %zd\n", result); goto error_get_descriptor; } desc_size = le16_to_cpu(bos->wTotalLength); if (desc_size >= alloc_size) { kfree(bos); alloc_size = desc_size; bos = kmalloc(alloc_size, GFP_KERNEL); if (bos == NULL) return -ENOMEM; } result = usb_get_descriptor(usb_dev, USB_DT_BOS, 0, bos, desc_size); if (result < 0 || result != desc_size) { dev_err(dev, "Can't get BOS descriptor or too short (need " "%zu bytes): %zd\n", desc_size, result); goto error_get_descriptor; } if (result < sizeof(*bos) || le16_to_cpu(bos->wTotalLength) != desc_size) { dev_err(dev, "Can't get BOS descriptor or too short (need " "%zu bytes): %zd\n", desc_size, result); goto error_get_descriptor; } result = wusb_dev_bos_grok(usb_dev, wusb_dev, bos, result); if (result < 0) goto error_bad_bos; wusb_dev->bos = bos; return 0; error_bad_bos: error_get_descriptor: kfree(bos); wusb_dev->wusb_cap_descr = NULL; return result; } static void wusb_dev_bos_rm(struct wusb_dev *wusb_dev) { kfree(wusb_dev->bos); wusb_dev->wusb_cap_descr = NULL; }; /* * USB stack's device addition Notifier Callback * * Called from drivers/usb/core/hub.c when a new device is added; we * use this hook to perform certain WUSB specific setup work on the * new device. As well, it is the first time we can connect the * wusb_dev and the usb_dev. So we note it down in wusb_dev and take a * reference that we'll drop. * * First we need to determine if the device is a WUSB device (else we * ignore it). For that we use the speed setting (USB_SPEED_WIRELESS) * [FIXME: maybe we'd need something more definitive]. If so, we track * it's usb_busd and from there, the WUSB HC. * * Because all WUSB HCs are contained in a 'struct wusbhc', voila, we * get the wusbhc for the device. * * We have a reference on @usb_dev (as we are called at the end of its * enumeration). * * NOTE: @usb_dev locked */ static void wusb_dev_add_ncb(struct usb_device *usb_dev) { int result = 0; struct wusb_dev *wusb_dev; struct wusbhc *wusbhc; struct device *dev = &usb_dev->dev; u8 port_idx; if (usb_dev->wusb == 0 || usb_dev->devnum == 1) return; /* skip non wusb and wusb RHs */ usb_set_device_state(usb_dev, USB_STATE_UNAUTHENTICATED); wusbhc = wusbhc_get_by_usb_dev(usb_dev); if (wusbhc == NULL) goto error_nodev; mutex_lock(&wusbhc->mutex); wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc, usb_dev); port_idx = wusb_port_no_to_idx(usb_dev->portnum); mutex_unlock(&wusbhc->mutex); if (wusb_dev == NULL) goto error_nodev; wusb_dev->usb_dev = usb_get_dev(usb_dev); usb_dev->wusb_dev = wusb_dev_get(wusb_dev); result = wusb_dev_sec_add(wusbhc, usb_dev, wusb_dev); if (result < 0) { dev_err(dev, "Cannot enable security: %d\n", result); goto error_sec_add; } /* Now query the device for it's BOS and attach it to wusb_dev */ result = wusb_dev_bos_add(usb_dev, wusb_dev); if (result < 0) { dev_err(dev, "Cannot get BOS descriptors: %d\n", result); goto error_bos_add; } result = wusb_dev_sysfs_add(wusbhc, usb_dev, wusb_dev); if (result < 0) goto error_add_sysfs; out: wusb_dev_put(wusb_dev); wusbhc_put(wusbhc); error_nodev: return; error_add_sysfs: wusb_dev_bos_rm(wusb_dev); error_bos_add: wusb_dev_sec_rm(wusb_dev); error_sec_add: mutex_lock(&wusbhc->mutex); __wusbhc_dev_disconnect(wusbhc, wusb_port_by_idx(wusbhc, port_idx)); mutex_unlock(&wusbhc->mutex); goto out; } /* * Undo all the steps done at connection by the notifier callback * * NOTE: @usb_dev locked */ static void wusb_dev_rm_ncb(struct usb_device *usb_dev) { struct wusb_dev *wusb_dev = usb_dev->wusb_dev; if (usb_dev->wusb == 0 || usb_dev->devnum == 1) return; /* skip non wusb and wusb RHs */ wusb_dev_sysfs_rm(wusb_dev); wusb_dev_bos_rm(wusb_dev); wusb_dev_sec_rm(wusb_dev); wusb_dev->usb_dev = NULL; usb_dev->wusb_dev = NULL; wusb_dev_put(wusb_dev); usb_put_dev(usb_dev); } /* * Handle notifications from the USB stack (notifier call back) * * This is called when the USB stack does a * usb_{bus,device}_{add,remove}() so we can do WUSB specific * handling. It is called with [for the case of * USB_DEVICE_{ADD,REMOVE} with the usb_dev locked. */ int wusb_usb_ncb(struct notifier_block *nb, unsigned long val, void *priv) { int result = NOTIFY_OK; switch (val) { case USB_DEVICE_ADD: wusb_dev_add_ncb(priv); break; case USB_DEVICE_REMOVE: wusb_dev_rm_ncb(priv); break; case USB_BUS_ADD: /* ignore (for now) */ case USB_BUS_REMOVE: break; default: WARN_ON(1); result = NOTIFY_BAD; } return result; } /* * Return a referenced wusb_dev given a @wusbhc and @usb_dev */ struct wusb_dev *__wusb_dev_get_by_usb_dev(struct wusbhc *wusbhc, struct usb_device *usb_dev) { struct wusb_dev *wusb_dev; u8 port_idx; port_idx = wusb_port_no_to_idx(usb_dev->portnum); BUG_ON(port_idx > wusbhc->ports_max); wusb_dev = wusb_port_by_idx(wusbhc, port_idx)->wusb_dev; if (wusb_dev != NULL) /* ops, device is gone */ wusb_dev_get(wusb_dev); return wusb_dev; } EXPORT_SYMBOL_GPL(__wusb_dev_get_by_usb_dev); void wusb_dev_destroy(struct kref *_wusb_dev) { struct wusb_dev *wusb_dev = container_of(_wusb_dev, struct wusb_dev, refcnt); list_del_init(&wusb_dev->cack_node); wusb_dev_free(wusb_dev); } EXPORT_SYMBOL_GPL(wusb_dev_destroy); /* * Create all the device connect handling infrastructure * * This is basically the device info array, Connect Acknowledgement * (cack) lists, keep-alive timers (and delayed work thread). */ int wusbhc_devconnect_create(struct wusbhc *wusbhc) { wusbhc->keep_alive_ie.hdr.bIEIdentifier = WUIE_ID_KEEP_ALIVE; wusbhc->keep_alive_ie.hdr.bLength = sizeof(wusbhc->keep_alive_ie.hdr); INIT_DELAYED_WORK(&wusbhc->keep_alive_timer, wusbhc_keep_alive_run); wusbhc->cack_ie.hdr.bIEIdentifier = WUIE_ID_CONNECTACK; wusbhc->cack_ie.hdr.bLength = sizeof(wusbhc->cack_ie.hdr); INIT_LIST_HEAD(&wusbhc->cack_list); return 0; } /* * Release all resources taken by the devconnect stuff */ void wusbhc_devconnect_destroy(struct wusbhc *wusbhc) { /* no op */ } /* * wusbhc_devconnect_start - start accepting device connections * @wusbhc: the WUSB HC * * Sets the Host Info IE to accept all new connections. * * FIXME: This also enables the keep alives but this is not necessary * until there are connected and authenticated devices. */ int wusbhc_devconnect_start(struct wusbhc *wusbhc) { struct device *dev = wusbhc->dev; struct wuie_host_info *hi; int result; hi = kzalloc(sizeof(*hi), GFP_KERNEL); if (hi == NULL) return -ENOMEM; hi->hdr.bLength = sizeof(*hi); hi->hdr.bIEIdentifier = WUIE_ID_HOST_INFO; hi->attributes = cpu_to_le16((wusbhc->rsv->stream << 3) | WUIE_HI_CAP_ALL); hi->CHID = wusbhc->chid; result = wusbhc_mmcie_set(wusbhc, 0, 0, &hi->hdr); if (result < 0) { dev_err(dev, "Cannot add Host Info MMCIE: %d\n", result); goto error_mmcie_set; } wusbhc->wuie_host_info = hi; queue_delayed_work(wusbd, &wusbhc->keep_alive_timer, msecs_to_jiffies(wusbhc->trust_timeout / 2)); return 0; error_mmcie_set: kfree(hi); return result; } /* * wusbhc_devconnect_stop - stop managing connected devices * @wusbhc: the WUSB HC * * Disconnects any devices still connected, stops the keep alives and * removes the Host Info IE. */ void wusbhc_devconnect_stop(struct wusbhc *wusbhc) { int i; mutex_lock(&wusbhc->mutex); for (i = 0; i < wusbhc->ports_max; i++) { if (wusbhc->port[i].wusb_dev) __wusbhc_dev_disconnect(wusbhc, &wusbhc->port[i]); } mutex_unlock(&wusbhc->mutex); cancel_delayed_work_sync(&wusbhc->keep_alive_timer); wusbhc_mmcie_rm(wusbhc, &wusbhc->wuie_host_info->hdr); kfree(wusbhc->wuie_host_info); wusbhc->wuie_host_info = NULL; } /* * wusb_set_dev_addr - set the WUSB device address used by the host * @wusbhc: the WUSB HC the device is connect to * @wusb_dev: the WUSB device * @addr: new device address */ int wusb_set_dev_addr(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, u8 addr) { int result; wusb_dev->addr = addr; result = wusbhc->dev_info_set(wusbhc, wusb_dev); if (result < 0) dev_err(wusbhc->dev, "device %d: failed to set device " "address\n", wusb_dev->port_idx); else dev_info(wusbhc->dev, "device %d: %s addr %u\n", wusb_dev->port_idx, (addr & WUSB_DEV_ADDR_UNAUTH) ? "unauth" : "auth", wusb_dev->addr); return result; }