// 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");
