--- /dev/null
+/*
+ * WUSB Wire Adapter: Control/Data Streaming Interface (WUSB[8])
+ * MMC (Microscheduled Management Command) handling
+ *
+ * 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.
+ *
+ *
+ * WUIEs and MMC IEs...well, they are almost the same at the end. MMC
+ * IEs are Wireless USB IEs that go into the MMC period...[what is
+ * that? look in Design-overview.txt].
+ *
+ *
+ * This is a simple subsystem to keep track of which IEs are being
+ * sent by the host in the MMC period.
+ *
+ * For each WUIE we ask to send, we keep it in an array, so we can
+ * request its removal later, or replace the content. They are tracked
+ * by pointer, so be sure to use the same pointer if you want to
+ * remove it or update the contents.
+ *
+ * FIXME:
+ * - add timers that autoremove intervalled IEs?
+ */
+#include <linux/usb/wusb.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include "wusbhc.h"
+
+/* Initialize the MMCIEs handling mechanism */
+int wusbhc_mmcie_create(struct wusbhc *wusbhc)
+{
+ u8 mmcies = wusbhc->mmcies_max;
+ wusbhc->mmcie = kcalloc(mmcies, sizeof(wusbhc->mmcie[0]), GFP_KERNEL);
+ if (wusbhc->mmcie == NULL)
+ return -ENOMEM;
+ mutex_init(&wusbhc->mmcie_mutex);
+ return 0;
+}
+
+/* Release resources used by the MMCIEs handling mechanism */
+void wusbhc_mmcie_destroy(struct wusbhc *wusbhc)
+{
+ kfree(wusbhc->mmcie);
+}
+
+/*
+ * Add or replace an MMC Wireless USB IE.
+ *
+ * @interval: See WUSB1.0[8.5.3.1]
+ * @repeat_cnt: See WUSB1.0[8.5.3.1]
+ * @handle: See WUSB1.0[8.5.3.1]
+ * @wuie: Pointer to the header of the WUSB IE data to add.
+ * MUST BE allocated in a kmalloc buffer (no stack or
+ * vmalloc).
+ * THE CALLER ALWAYS OWNS THE POINTER (we don't free it
+ * on remove, we just forget about it).
+ * @returns: 0 if ok, < 0 errno code on error.
+ *
+ * Goes over the *whole* @wusbhc->mmcie array looking for (a) the
+ * first free spot and (b) if @wuie is already in the array (aka:
+ * transmitted in the MMCs) the spot were it is.
+ *
+ * If present, we "overwrite it" (update).
+ *
+ *
+ * NOTE: Need special ordering rules -- see below WUSB1.0 Table 7-38.
+ * The host uses the handle as the 'sort' index. We
+ * allocate the last one always for the WUIE_ID_HOST_INFO, and
+ * the rest, first come first serve in inverse order.
+ *
+ * Host software must make sure that it adds the other IEs in
+ * the right order... the host hardware is responsible for
+ * placing the WCTA IEs in the right place with the other IEs
+ * set by host software.
+ *
+ * NOTE: we can access wusbhc->wa_descr without locking because it is
+ * read only.
+ */
+int wusbhc_mmcie_set(struct wusbhc *wusbhc, u8 interval, u8 repeat_cnt,
+ struct wuie_hdr *wuie)
+{
+ int result = -ENOBUFS;
+ unsigned handle, itr;
+
+ /* Search a handle, taking into account the ordering */
+ mutex_lock(&wusbhc->mmcie_mutex);
+ switch (wuie->bIEIdentifier) {
+ case WUIE_ID_HOST_INFO:
+ /* Always last */
+ handle = wusbhc->mmcies_max - 1;
+ break;
+ case WUIE_ID_ISOCH_DISCARD:
+ dev_err(wusbhc->dev, "Special ordering case for WUIE ID 0x%x "
+ "unimplemented\n", wuie->bIEIdentifier);
+ result = -ENOSYS;
+ goto error_unlock;
+ default:
+ /* search for it or find the last empty slot */
+ handle = ~0;
+ for (itr = 0; itr < wusbhc->mmcies_max - 1; itr++) {
+ if (wusbhc->mmcie[itr] == wuie) {
+ handle = itr;
+ break;
+ }
+ if (wusbhc->mmcie[itr] == NULL)
+ handle = itr;
+ }
+ if (handle == ~0)
+ goto error_unlock;
+ }
+ result = (wusbhc->mmcie_add)(wusbhc, interval, repeat_cnt, handle,
+ wuie);
+ if (result >= 0)
+ wusbhc->mmcie[handle] = wuie;
+error_unlock:
+ mutex_unlock(&wusbhc->mmcie_mutex);
+ return result;
+}
+EXPORT_SYMBOL_GPL(wusbhc_mmcie_set);
+
+/*
+ * Remove an MMC IE previously added with wusbhc_mmcie_set()
+ *
+ * @wuie Pointer used to add the WUIE
+ */
+void wusbhc_mmcie_rm(struct wusbhc *wusbhc, struct wuie_hdr *wuie)
+{
+ int result;
+ unsigned handle, itr;
+
+ mutex_lock(&wusbhc->mmcie_mutex);
+ for (itr = 0; itr < wusbhc->mmcies_max; itr++) {
+ if (wusbhc->mmcie[itr] == wuie) {
+ handle = itr;
+ goto found;
+ }
+ }
+ mutex_unlock(&wusbhc->mmcie_mutex);
+ return;
+
+found:
+ result = (wusbhc->mmcie_rm)(wusbhc, handle);
+ if (result == 0)
+ wusbhc->mmcie[itr] = NULL;
+ mutex_unlock(&wusbhc->mmcie_mutex);
+}
+EXPORT_SYMBOL_GPL(wusbhc_mmcie_rm);
+
+static int wusbhc_mmc_start(struct wusbhc *wusbhc)
+{
+ int ret;
+
+ mutex_lock(&wusbhc->mutex);
+ ret = wusbhc->start(wusbhc);
+ if (ret >= 0)
+ wusbhc->active = 1;
+ mutex_unlock(&wusbhc->mutex);
+
+ return ret;
+}
+
+static void wusbhc_mmc_stop(struct wusbhc *wusbhc)
+{
+ mutex_lock(&wusbhc->mutex);
+ wusbhc->active = 0;
+ wusbhc->stop(wusbhc, WUSB_CHANNEL_STOP_DELAY_MS);
+ mutex_unlock(&wusbhc->mutex);
+}
+
+/*
+ * wusbhc_start - start transmitting MMCs and accepting connections
+ * @wusbhc: the HC to start
+ *
+ * Establishes a cluster reservation, enables device connections, and
+ * starts MMCs with appropriate DNTS parameters.
+ */
+int wusbhc_start(struct wusbhc *wusbhc)
+{
+ int result;
+ struct device *dev = wusbhc->dev;
+
+ WARN_ON(wusbhc->wuie_host_info != NULL);
+ BUG_ON(wusbhc->uwb_rc == NULL);
+
+ result = wusbhc_rsv_establish(wusbhc);
+ if (result < 0) {
+ dev_err(dev, "cannot establish cluster reservation: %d\n",
+ result);
+ goto error_rsv_establish;
+ }
+
+ result = wusbhc_devconnect_start(wusbhc);
+ if (result < 0) {
+ dev_err(dev, "error enabling device connections: %d\n",
+ result);
+ goto error_devconnect_start;
+ }
+
+ result = wusbhc_sec_start(wusbhc);
+ if (result < 0) {
+ dev_err(dev, "error starting security in the HC: %d\n",
+ result);
+ goto error_sec_start;
+ }
+
+ result = wusbhc->set_num_dnts(wusbhc, wusbhc->dnts_interval,
+ wusbhc->dnts_num_slots);
+ if (result < 0) {
+ dev_err(dev, "Cannot set DNTS parameters: %d\n", result);
+ goto error_set_num_dnts;
+ }
+ result = wusbhc_mmc_start(wusbhc);
+ if (result < 0) {
+ dev_err(dev, "error starting wusbch: %d\n", result);
+ goto error_wusbhc_start;
+ }
+
+ return 0;
+
+error_wusbhc_start:
+ wusbhc_sec_stop(wusbhc);
+error_set_num_dnts:
+error_sec_start:
+ wusbhc_devconnect_stop(wusbhc);
+error_devconnect_start:
+ wusbhc_rsv_terminate(wusbhc);
+error_rsv_establish:
+ return result;
+}
+
+/*
+ * wusbhc_stop - stop transmitting MMCs
+ * @wusbhc: the HC to stop
+ *
+ * Stops the WUSB channel and removes the cluster reservation.
+ */
+void wusbhc_stop(struct wusbhc *wusbhc)
+{
+ wusbhc_mmc_stop(wusbhc);
+ wusbhc_sec_stop(wusbhc);
+ wusbhc_devconnect_stop(wusbhc);
+ wusbhc_rsv_terminate(wusbhc);
+}
+
+/*
+ * Set/reset/update a new CHID
+ *
+ * Depending on the previous state of the MMCs, start, stop or change
+ * the sent MMC. This effectively switches the host controller on and
+ * off (radio wise).
+ */
+int wusbhc_chid_set(struct wusbhc *wusbhc, const struct wusb_ckhdid *chid)
+{
+ int result = 0;
+
+ if (memcmp(chid, &wusb_ckhdid_zero, sizeof(*chid)) == 0)
+ chid = NULL;
+
+ mutex_lock(&wusbhc->mutex);
+ if (chid) {
+ if (wusbhc->active) {
+ mutex_unlock(&wusbhc->mutex);
+ return -EBUSY;
+ }
+ wusbhc->chid = *chid;
+ }
+
+ /* register with UWB if we haven't already since we are about to start
+ the radio. */
+ if ((chid) && (wusbhc->uwb_rc == NULL)) {
+ wusbhc->uwb_rc = uwb_rc_get_by_grandpa(wusbhc->dev->parent);
+ if (wusbhc->uwb_rc == NULL) {
+ result = -ENODEV;
+ dev_err(wusbhc->dev,
+ "Cannot get associated UWB Host Controller\n");
+ goto error_rc_get;
+ }
+
+ result = wusbhc_pal_register(wusbhc);
+ if (result < 0) {
+ dev_err(wusbhc->dev, "Cannot register as a UWB PAL\n");
+ goto error_pal_register;
+ }
+ }
+ mutex_unlock(&wusbhc->mutex);
+
+ if (chid)
+ result = uwb_radio_start(&wusbhc->pal);
+ else if (wusbhc->uwb_rc)
+ uwb_radio_stop(&wusbhc->pal);
+
+ return result;
+
+error_pal_register:
+ uwb_rc_put(wusbhc->uwb_rc);
+ wusbhc->uwb_rc = NULL;
+error_rc_get:
+ mutex_unlock(&wusbhc->mutex);
+
+ return result;
+}
+EXPORT_SYMBOL_GPL(wusbhc_chid_set);
Code Review / kvmfornfv.git / blobdiff