1 files changed, 490 insertions, 0 deletions
diff --git a/drivers/staging/wusbcore/wusbhc.c b/drivers/staging/wusbcore/wusbhc.c
new file mode 100644
index 000000000000..d0b404d258e8
--- /dev/null
+++ b/drivers/staging/wusbcore/wusbhc.c
@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Wireless USB Host Controller
+ * sysfs glue, wusbcore module support and life cycle management
+ *
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * Creation/destruction of wusbhc is split in two parts; that that
+ * doesn't require the HCD to be added (wusbhc_{create,destroy}) and
+ * the one that requires (phase B, wusbhc_b_{create,destroy}).
+ *
+ * This is so because usb_add_hcd() will start the HC, and thus, all
+ * the HC specific stuff has to be already initialized (like sysfs
+ * thingies).
+ */
+#include <linux/device.h>
+#include <linux/module.h>
+#include "wusbhc.h"
+
+/**
+ * Extract the wusbhc that corresponds to a USB Host Controller class device
+ *
+ * WARNING! Apply only if @dev is that of a
+ *          wusbhc.usb_hcd.self->class_dev; otherwise, you loose.
+ */
+static struct wusbhc *usbhc_dev_to_wusbhc(struct device *dev)
+{
+	struct usb_bus *usb_bus = dev_get_drvdata(dev);
+	struct usb_hcd *usb_hcd = bus_to_hcd(usb_bus);
+	return usb_hcd_to_wusbhc(usb_hcd);
+}
+
+/*
+ * Show & store the current WUSB trust timeout
+ *
+ * We don't do locking--it is an 'atomic' value.
+ *
+ * The units that we store/show are always MILLISECONDS. However, the
+ * value of trust_timeout is jiffies.
+ */
+static ssize_t wusb_trust_timeout_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n", wusbhc->trust_timeout);
+}
+
+static ssize_t wusb_trust_timeout_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t size)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+	ssize_t result = -ENOSYS;
+	unsigned trust_timeout;
+
+	result = sscanf(buf, "%u", &trust_timeout);
+	if (result != 1) {
+		result = -EINVAL;
+		goto out;
+	}
+	wusbhc->trust_timeout = min_t(unsigned, trust_timeout, 500);
+	cancel_delayed_work(&wusbhc->keep_alive_timer);
+	flush_workqueue(wusbd);
+	queue_delayed_work(wusbd, &wusbhc->keep_alive_timer,
+			   msecs_to_jiffies(wusbhc->trust_timeout / 2));
+out:
+	return result < 0 ? result : size;
+}
+static DEVICE_ATTR_RW(wusb_trust_timeout);
+
+/*
+ * Show the current WUSB CHID.
+ */
+static ssize_t wusb_chid_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+	const struct wusb_ckhdid *chid;
+
+	if (wusbhc->wuie_host_info != NULL)
+		chid = &wusbhc->wuie_host_info->CHID;
+	else
+		chid = &wusb_ckhdid_zero;
+
+	return sprintf(buf, "%16ph\n", chid->data);
+}
+
+/*
+ * Store a new CHID.
+ *
+ * - Write an all zeros CHID and it will stop the controller
+ * - Write a non-zero CHID and it will start it.
+ *
+ * See wusbhc_chid_set() for more info.
+ */
+static ssize_t wusb_chid_store(struct device *dev,
+			       struct device_attribute *attr,
+			       const char *buf, size_t size)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+	struct wusb_ckhdid chid;
+	ssize_t result;
+
+	result = sscanf(buf,
+			"%02hhx %02hhx %02hhx %02hhx "
+			"%02hhx %02hhx %02hhx %02hhx "
+			"%02hhx %02hhx %02hhx %02hhx "
+			"%02hhx %02hhx %02hhx %02hhx\n",
+			&chid.data[0] , &chid.data[1] ,
+			&chid.data[2] , &chid.data[3] ,
+			&chid.data[4] , &chid.data[5] ,
+			&chid.data[6] , &chid.data[7] ,
+			&chid.data[8] , &chid.data[9] ,
+			&chid.data[10], &chid.data[11],
+			&chid.data[12], &chid.data[13],
+			&chid.data[14], &chid.data[15]);
+	if (result != 16) {
+		dev_err(dev, "Unrecognized CHID (need 16 8-bit hex digits): "
+			"%d\n", (int)result);
+		return -EINVAL;
+	}
+	result = wusbhc_chid_set(wusbhc, &chid);
+	return result < 0 ? result : size;
+}
+static DEVICE_ATTR_RW(wusb_chid);
+
+
+static ssize_t wusb_phy_rate_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+
+	return sprintf(buf, "%d\n", wusbhc->phy_rate);
+}
+
+static ssize_t wusb_phy_rate_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t size)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+	uint8_t phy_rate;
+	ssize_t result;
+
+	result = sscanf(buf, "%hhu", &phy_rate);
+	if (result != 1)
+		return -EINVAL;
+	if (phy_rate >= UWB_PHY_RATE_INVALID)
+		return -EINVAL;
+
+	wusbhc->phy_rate = phy_rate;
+	return size;
+}
+static DEVICE_ATTR_RW(wusb_phy_rate);
+
+static ssize_t wusb_dnts_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+
+	return sprintf(buf, "num slots: %d\ninterval: %dms\n",
+			wusbhc->dnts_num_slots, wusbhc->dnts_interval);
+}
+
+static ssize_t wusb_dnts_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t size)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+	uint8_t num_slots, interval;
+	ssize_t result;
+
+	result = sscanf(buf, "%hhu %hhu", &num_slots, &interval);
+
+	if (result != 2)
+		return -EINVAL;
+
+	wusbhc->dnts_num_slots = num_slots;
+	wusbhc->dnts_interval = interval;
+
+	return size;
+}
+static DEVICE_ATTR_RW(wusb_dnts);
+
+static ssize_t wusb_retry_count_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+
+	return sprintf(buf, "%d\n", wusbhc->retry_count);
+}
+
+static ssize_t wusb_retry_count_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t size)
+{
+	struct wusbhc *wusbhc = usbhc_dev_to_wusbhc(dev);
+	uint8_t retry_count;
+	ssize_t result;
+
+	result = sscanf(buf, "%hhu", &retry_count);
+
+	if (result != 1)
+		return -EINVAL;
+
+	wusbhc->retry_count = max_t(uint8_t, retry_count,
+					WUSB_RETRY_COUNT_MAX);
+
+	return size;
+}
+static DEVICE_ATTR_RW(wusb_retry_count);
+
+/* Group all the WUSBHC attributes */
+static struct attribute *wusbhc_attrs[] = {
+		&dev_attr_wusb_trust_timeout.attr,
+		&dev_attr_wusb_chid.attr,
+		&dev_attr_wusb_phy_rate.attr,
+		&dev_attr_wusb_dnts.attr,
+		&dev_attr_wusb_retry_count.attr,
+		NULL,
+};
+
+static const struct attribute_group wusbhc_attr_group = {
+	.name = NULL,	/* we want them in the same directory */
+	.attrs = wusbhc_attrs,
+};
+
+/*
+ * Create a wusbhc instance
+ *
+ * NOTEs:
+ *
+ *  - assumes *wusbhc has been zeroed and wusbhc->usb_hcd has been
+ *    initialized but not added.
+ *
+ *  - fill out ports_max, mmcies_max and mmcie_{add,rm} before calling.
+ *
+ *  - fill out wusbhc->uwb_rc and refcount it before calling
+ *  - fill out the wusbhc->sec_modes array
+ */
+int wusbhc_create(struct wusbhc *wusbhc)
+{
+	int result = 0;
+
+	/* set defaults.  These can be overwritten using sysfs attributes. */
+	wusbhc->trust_timeout = WUSB_TRUST_TIMEOUT_MS;
+	wusbhc->phy_rate = UWB_PHY_RATE_INVALID - 1;
+	wusbhc->dnts_num_slots = 4;
+	wusbhc->dnts_interval = 2;
+	wusbhc->retry_count = WUSB_RETRY_COUNT_INFINITE;
+
+	mutex_init(&wusbhc->mutex);
+	result = wusbhc_mmcie_create(wusbhc);
+	if (result < 0)
+		goto error_mmcie_create;
+	result = wusbhc_devconnect_create(wusbhc);
+	if (result < 0)
+		goto error_devconnect_create;
+	result = wusbhc_rh_create(wusbhc);
+	if (result < 0)
+		goto error_rh_create;
+	result = wusbhc_sec_create(wusbhc);
+	if (result < 0)
+		goto error_sec_create;
+	return 0;
+
+error_sec_create:
+	wusbhc_rh_destroy(wusbhc);
+error_rh_create:
+	wusbhc_devconnect_destroy(wusbhc);
+error_devconnect_create:
+	wusbhc_mmcie_destroy(wusbhc);
+error_mmcie_create:
+	return result;
+}
+EXPORT_SYMBOL_GPL(wusbhc_create);
+
+static inline struct kobject *wusbhc_kobj(struct wusbhc *wusbhc)
+{
+	return &wusbhc->usb_hcd.self.controller->kobj;
+}
+
+/*
+ * Phase B of a wusbhc instance creation
+ *
+ * Creates fields that depend on wusbhc->usb_hcd having been
+ * added. This is where we create the sysfs files in
+ * /sys/class/usb_host/usb_hostX/.
+ *
+ * NOTE: Assumes wusbhc->usb_hcd has been already added by the upper
+ *       layer (hwahc or whci)
+ */
+int wusbhc_b_create(struct wusbhc *wusbhc)
+{
+	int result = 0;
+	struct device *dev = wusbhc->usb_hcd.self.controller;
+
+	result = sysfs_create_group(wusbhc_kobj(wusbhc), &wusbhc_attr_group);
+	if (result < 0) {
+		dev_err(dev, "Cannot register WUSBHC attributes: %d\n",
+			result);
+		goto error_create_attr_group;
+	}
+
+	return 0;
+error_create_attr_group:
+	return result;
+}
+EXPORT_SYMBOL_GPL(wusbhc_b_create);
+
+void wusbhc_b_destroy(struct wusbhc *wusbhc)
+{
+	wusbhc_pal_unregister(wusbhc);
+	sysfs_remove_group(wusbhc_kobj(wusbhc), &wusbhc_attr_group);
+}
+EXPORT_SYMBOL_GPL(wusbhc_b_destroy);
+
+void wusbhc_destroy(struct wusbhc *wusbhc)
+{
+	wusbhc_sec_destroy(wusbhc);
+	wusbhc_rh_destroy(wusbhc);
+	wusbhc_devconnect_destroy(wusbhc);
+	wusbhc_mmcie_destroy(wusbhc);
+}
+EXPORT_SYMBOL_GPL(wusbhc_destroy);
+
+struct workqueue_struct *wusbd;
+EXPORT_SYMBOL_GPL(wusbd);
+
+/*
+ * WUSB Cluster ID allocation map
+ *
+ * Each WUSB bus in a channel is identified with a Cluster Id in the
+ * unauth address pace (WUSB1.0[4.3]). We take the range 0xe0 to 0xff
+ * (that's space for 31 WUSB controllers, as 0xff can't be taken). We
+ * start taking from 0xff, 0xfe, 0xfd... (hence the += or -= 0xff).
+ *
+ * For each one we taken, we pin it in the bitap
+ */
+#define CLUSTER_IDS 32
+static DECLARE_BITMAP(wusb_cluster_id_table, CLUSTER_IDS);
+static DEFINE_SPINLOCK(wusb_cluster_ids_lock);
+
+/*
+ * Get a WUSB Cluster ID
+ *
+ * Need to release with wusb_cluster_id_put() when done w/ it.
+ */
+/* FIXME: coordinate with the choose_addres() from the USB stack */
+/* we want to leave the top of the 128 range for cluster addresses and
+ * the bottom for device addresses (as we map them one on one with
+ * ports). */
+u8 wusb_cluster_id_get(void)
+{
+	u8 id;
+	spin_lock(&wusb_cluster_ids_lock);
+	id = find_first_zero_bit(wusb_cluster_id_table, CLUSTER_IDS);
+	if (id >= CLUSTER_IDS) {
+		id = 0;
+		goto out;
+	}
+	set_bit(id, wusb_cluster_id_table);
+	id = (u8) 0xff - id;
+out:
+	spin_unlock(&wusb_cluster_ids_lock);
+	return id;
+
+}
+EXPORT_SYMBOL_GPL(wusb_cluster_id_get);
+
+/*
+ * Release a WUSB Cluster ID
+ *
+ * Obtained it with wusb_cluster_id_get()
+ */
+void wusb_cluster_id_put(u8 id)
+{
+	id = 0xff - id;
+	BUG_ON(id >= CLUSTER_IDS);
+	spin_lock(&wusb_cluster_ids_lock);
+	WARN_ON(!test_bit(id, wusb_cluster_id_table));
+	clear_bit(id, wusb_cluster_id_table);
+	spin_unlock(&wusb_cluster_ids_lock);
+}
+EXPORT_SYMBOL_GPL(wusb_cluster_id_put);
+
+/**
+ * wusbhc_giveback_urb - return an URB to the USB core
+ * @wusbhc: the host controller the URB is from.
+ * @urb:    the URB.
+ * @status: the URB's status.
+ *
+ * Return an URB to the USB core doing some additional WUSB specific
+ * processing.
+ *
+ *  - After a successful transfer, update the trust timeout timestamp
+ *    for the WUSB device.
+ *
+ *  - [WUSB] sections 4.13 and 7.5.1 specify the stop retransmission
+ *    condition for the WCONNECTACK_IE is that the host has observed
+ *    the associated device responding to a control transfer.
+ */
+void wusbhc_giveback_urb(struct wusbhc *wusbhc, struct urb *urb, int status)
+{
+	struct wusb_dev *wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc,
+					urb->dev);
+
+	if (status == 0 && wusb_dev) {
+		wusb_dev->entry_ts = jiffies;
+
+		/* wusbhc_devconnect_acked() can't be called from
+		   atomic context so defer it to a work queue. */
+		if (!list_empty(&wusb_dev->cack_node))
+			queue_work(wusbd, &wusb_dev->devconnect_acked_work);
+		else
+			wusb_dev_put(wusb_dev);
+	}
+
+	usb_hcd_giveback_urb(&wusbhc->usb_hcd, urb, status);
+}
+EXPORT_SYMBOL_GPL(wusbhc_giveback_urb);
+
+/**
+ * wusbhc_reset_all - reset the HC hardware
+ * @wusbhc: the host controller to reset.
+ *
+ * Request a full hardware reset of the chip.  This will also reset
+ * the radio controller and any other PALs.
+ */
+void wusbhc_reset_all(struct wusbhc *wusbhc)
+{
+	if (wusbhc->uwb_rc)
+		uwb_rc_reset_all(wusbhc->uwb_rc);
+}
+EXPORT_SYMBOL_GPL(wusbhc_reset_all);
+
+static struct notifier_block wusb_usb_notifier = {
+	.notifier_call = wusb_usb_ncb,
+	.priority = INT_MAX	/* Need to be called first of all */
+};
+
+static int __init wusbcore_init(void)
+{
+	int result;
+	result = wusb_crypto_init();
+	if (result < 0)
+		goto error_crypto_init;
+	/* WQ is singlethread because we need to serialize notifications */
+	wusbd = create_singlethread_workqueue("wusbd");
+	if (wusbd == NULL) {
+		result = -ENOMEM;
+		printk(KERN_ERR "WUSB-core: Cannot create wusbd workqueue\n");
+		goto error_wusbd_create;
+	}
+	usb_register_notify(&wusb_usb_notifier);
+	bitmap_zero(wusb_cluster_id_table, CLUSTER_IDS);
+	set_bit(0, wusb_cluster_id_table);	/* reserve Cluster ID 0xff */
+	return 0;
+
+error_wusbd_create:
+	wusb_crypto_exit();
+error_crypto_init:
+	return result;
+
+}
+module_init(wusbcore_init);
+
+static void __exit wusbcore_exit(void)
+{
+	clear_bit(0, wusb_cluster_id_table);
+	if (!bitmap_empty(wusb_cluster_id_table, CLUSTER_IDS)) {
+		printk(KERN_ERR "BUG: WUSB Cluster IDs not released on exit: %*pb\n",
+		       CLUSTER_IDS, wusb_cluster_id_table);
+		WARN_ON(1);
+	}
+	usb_unregister_notify(&wusb_usb_notifier);
+	destroy_workqueue(wusbd);
+	wusb_crypto_exit();
+}
+module_exit(wusbcore_exit);
+
+MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
+MODULE_DESCRIPTION("Wireless USB core");
+MODULE_LICENSE("GPL");