u-boot/drivers/usb/host/usb-uclass.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*
* usb_match_device() modified from Linux kernel v4.0.
*/
#define LOG_CATEGORY UCLASS_USB
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <memalign.h>
#include <usb.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass-internal.h>
extern bool usb_started; /* flag for the started/stopped USB status */
static bool asynch_allowed;
struct usb_uclass_priv {
int companion_device_count;
};
int usb_lock_async(struct usb_device *udev, int lock)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->lock_async)
return -ENOSYS;
return ops->lock_async(bus, lock);
}
int usb_disable_asynch(int disable)
{
int old_value = asynch_allowed;
asynch_allowed = !disable;
return old_value;
}
int submit_int_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
int length, int interval, bool nonblock)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->interrupt)
return -ENOSYS;
return ops->interrupt(bus, udev, pipe, buffer, length, interval,
nonblock);
}
int submit_control_msg(struct usb_device *udev, unsigned long pipe,
void *buffer, int length, struct devrequest *setup)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
struct usb_uclass_priv *uc_priv = uclass_get_priv(bus->uclass);
int err;
if (!ops->control)
return -ENOSYS;
err = ops->control(bus, udev, pipe, buffer, length, setup);
if (setup->request == USB_REQ_SET_FEATURE &&
setup->requesttype == USB_RT_PORT &&
setup->value == cpu_to_le16(USB_PORT_FEAT_RESET) &&
err == -ENXIO) {
/* Device handed over to companion after port reset */
uc_priv->companion_device_count++;
}
return err;
}
int submit_bulk_msg(struct usb_device *udev, unsigned long pipe, void *buffer,
int length)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->bulk)
return -ENOSYS;
return ops->bulk(bus, udev, pipe, buffer, length);
}
struct int_queue *create_int_queue(struct usb_device *udev,
unsigned long pipe, int queuesize, int elementsize,
void *buffer, int interval)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->create_int_queue)
return NULL;
return ops->create_int_queue(bus, udev, pipe, queuesize, elementsize,
buffer, interval);
}
void *poll_int_queue(struct usb_device *udev, struct int_queue *queue)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->poll_int_queue)
return NULL;
return ops->poll_int_queue(bus, udev, queue);
}
int destroy_int_queue(struct usb_device *udev, struct int_queue *queue)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->destroy_int_queue)
return -ENOSYS;
return ops->destroy_int_queue(bus, udev, queue);
}
int usb_alloc_device(struct usb_device *udev)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
/* This is only requird by some controllers - current XHCI */
if (!ops->alloc_device)
return 0;
return ops->alloc_device(bus, udev);
}
int usb_reset_root_port(struct usb_device *udev)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->reset_root_port)
return -ENOSYS;
return ops->reset_root_port(bus, udev);
}
int usb_update_hub_device(struct usb_device *udev)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->update_hub_device)
return -ENOSYS;
return ops->update_hub_device(bus, udev);
}
int usb_get_max_xfer_size(struct usb_device *udev, size_t *size)
{
struct udevice *bus = udev->controller_dev;
struct dm_usb_ops *ops = usb_get_ops(bus);
if (!ops->get_max_xfer_size)
return -ENOSYS;
return ops->get_max_xfer_size(bus, size);
}
int usb_stop(void)
{
struct udevice *bus;
dm: usb: Fix broken usb_stop() At present we only do device_remove() during usb stop. The DM API device_remove() only marks the device state as inactivated, but still keeps its USB topology (eg: parent, children, etc) in the DM device structure. There is no issue if we only start USB subsystem once and never stop it. But a big issue occurs when we do 'usb stop' and 'usb start' multiple times. Strange things may be observed with current implementation, like: - the enumeration may report only 1 mass storage device is detected, but the total number of USB devices is correct. - USB keyboard does not work anymore after a bunch of 'usb reset' even if 'usb tree' shows it is correctly identified. - read/write flash drive via 'fatload usb' may complain "Bad device" In fact, every time when USB host controller starts the enumeration process, it takes random time for each USB port to show up online, hence each USB device may appear in a different order from previous enumeration, and gets assigned to a totally different USB address. As a result, we end up using a stale USB topology in the DM device structure which still reflects the previous enumeration result, and it may create an exact same DM device name like generic_bus_0_dev_7 that is already in the DM device structure. And since the DM device structure is there, there is no device_bind() call to bind driver to the device during current enumeration process, eventually creating an inconsistent software representation of the hardware topology, a non-working USB subsystem. The fix is to clear the unused USB topology in the usb_stop(), by calling device_unbind() on each controller's root hub device, and the unbinding will unbind all of its children automatically. For Sandbox, we need scan the device tree each time when we start the USB stack, in order to re-create the emulated USB devices and bind drivers for them before we actually do the driver probe. Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2017-10-01 13:19:42 +00:00
struct udevice *rh;
struct uclass *uc;
struct usb_uclass_priv *uc_priv;
int err = 0, ret;
/* De-activate any devices that have been activated */
ret = uclass_get(UCLASS_USB, &uc);
if (ret)
return ret;
uc_priv = uclass_get_priv(uc);
uclass_foreach_dev(bus, uc) {
ret = device_remove(bus, DM_REMOVE_NORMAL);
if (ret && !err)
err = ret;
dm: usb: Fix broken usb_stop() At present we only do device_remove() during usb stop. The DM API device_remove() only marks the device state as inactivated, but still keeps its USB topology (eg: parent, children, etc) in the DM device structure. There is no issue if we only start USB subsystem once and never stop it. But a big issue occurs when we do 'usb stop' and 'usb start' multiple times. Strange things may be observed with current implementation, like: - the enumeration may report only 1 mass storage device is detected, but the total number of USB devices is correct. - USB keyboard does not work anymore after a bunch of 'usb reset' even if 'usb tree' shows it is correctly identified. - read/write flash drive via 'fatload usb' may complain "Bad device" In fact, every time when USB host controller starts the enumeration process, it takes random time for each USB port to show up online, hence each USB device may appear in a different order from previous enumeration, and gets assigned to a totally different USB address. As a result, we end up using a stale USB topology in the DM device structure which still reflects the previous enumeration result, and it may create an exact same DM device name like generic_bus_0_dev_7 that is already in the DM device structure. And since the DM device structure is there, there is no device_bind() call to bind driver to the device during current enumeration process, eventually creating an inconsistent software representation of the hardware topology, a non-working USB subsystem. The fix is to clear the unused USB topology in the usb_stop(), by calling device_unbind() on each controller's root hub device, and the unbinding will unbind all of its children automatically. For Sandbox, we need scan the device tree each time when we start the USB stack, in order to re-create the emulated USB devices and bind drivers for them before we actually do the driver probe. Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2017-10-01 13:19:42 +00:00
/* Locate root hub device */
device_find_first_child(bus, &rh);
if (rh) {
/*
* All USB devices are children of root hub.
* Unbinding root hub will unbind all of its children.
*/
ret = device_unbind(rh);
if (ret && !err)
err = ret;
}
}
#ifdef CONFIG_USB_STORAGE
usb_stor_reset();
#endif
uc_priv->companion_device_count = 0;
usb_started = 0;
return err;
}
static void usb_scan_bus(struct udevice *bus, bool recurse)
{
struct usb_bus_priv *priv;
struct udevice *dev;
int ret;
priv = dev_get_uclass_priv(bus);
assert(recurse); /* TODO: Support non-recusive */
printf("scanning bus %s for devices... ", bus->name);
debug("\n");
ret = usb_scan_device(bus, 0, USB_SPEED_FULL, &dev);
if (ret)
printf("failed, error %d\n", ret);
else if (priv->next_addr == 0)
printf("No USB Device found\n");
else
printf("%d USB Device(s) found\n", priv->next_addr);
}
static void remove_inactive_children(struct uclass *uc, struct udevice *bus)
{
uclass_foreach_dev(bus, uc) {
struct udevice *dev, *next;
if (!device_active(bus))
continue;
device_foreach_child_safe(dev, next, bus) {
if (!device_active(dev))
device_unbind(dev);
}
}
}
int usb_init(void)
{
int controllers_initialized = 0;
struct usb_uclass_priv *uc_priv;
struct usb_bus_priv *priv;
struct udevice *bus;
struct uclass *uc;
int ret;
asynch_allowed = 1;
ret = uclass_get(UCLASS_USB, &uc);
if (ret)
return ret;
uc_priv = uclass_get_priv(uc);
uclass_foreach_dev(bus, uc) {
/* init low_level USB */
printf("Bus %s: ", bus->name);
dm: usb: Fix broken usb_stop() At present we only do device_remove() during usb stop. The DM API device_remove() only marks the device state as inactivated, but still keeps its USB topology (eg: parent, children, etc) in the DM device structure. There is no issue if we only start USB subsystem once and never stop it. But a big issue occurs when we do 'usb stop' and 'usb start' multiple times. Strange things may be observed with current implementation, like: - the enumeration may report only 1 mass storage device is detected, but the total number of USB devices is correct. - USB keyboard does not work anymore after a bunch of 'usb reset' even if 'usb tree' shows it is correctly identified. - read/write flash drive via 'fatload usb' may complain "Bad device" In fact, every time when USB host controller starts the enumeration process, it takes random time for each USB port to show up online, hence each USB device may appear in a different order from previous enumeration, and gets assigned to a totally different USB address. As a result, we end up using a stale USB topology in the DM device structure which still reflects the previous enumeration result, and it may create an exact same DM device name like generic_bus_0_dev_7 that is already in the DM device structure. And since the DM device structure is there, there is no device_bind() call to bind driver to the device during current enumeration process, eventually creating an inconsistent software representation of the hardware topology, a non-working USB subsystem. The fix is to clear the unused USB topology in the usb_stop(), by calling device_unbind() on each controller's root hub device, and the unbinding will unbind all of its children automatically. For Sandbox, we need scan the device tree each time when we start the USB stack, in order to re-create the emulated USB devices and bind drivers for them before we actually do the driver probe. Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2017-10-01 13:19:42 +00:00
#ifdef CONFIG_SANDBOX
/*
* For Sandbox, we need scan the device tree each time when we
* start the USB stack, in order to re-create the emulated USB
* devices and bind drivers for them before we actually do the
* driver probe.
*/
ret = dm_scan_fdt_dev(bus);
if (ret) {
printf("Sandbox USB device scan failed (%d)\n", ret);
continue;
}
#endif
ret = device_probe(bus);
if (ret == -ENODEV) { /* No such device. */
puts("Port not available.\n");
controllers_initialized++;
continue;
}
if (ret) { /* Other error. */
printf("probe failed, error %d\n", ret);
continue;
}
controllers_initialized++;
usb_started = true;
}
/*
* lowlevel init done, now scan the bus for devices i.e. search HUBs
* and configure them, first scan primary controllers.
*/
uclass_foreach_dev(bus, uc) {
if (!device_active(bus))
continue;
priv = dev_get_uclass_priv(bus);
if (!priv->companion)
usb_scan_bus(bus, true);
}
/*
* Now that the primary controllers have been scanned and have handed
* over any devices they do not understand to their companions, scan
* the companions if necessary.
*/
if (uc_priv->companion_device_count) {
uclass_foreach_dev(bus, uc) {
if (!device_active(bus))
continue;
priv = dev_get_uclass_priv(bus);
if (priv->companion)
usb_scan_bus(bus, true);
}
}
debug("scan end\n");
/* Remove any devices that were not found on this scan */
remove_inactive_children(uc, bus);
ret = uclass_get(UCLASS_USB_HUB, &uc);
if (ret)
return ret;
remove_inactive_children(uc, bus);
/* if we were not able to find at least one working bus, bail out */
if (controllers_initialized == 0)
printf("No working controllers found\n");
return usb_started ? 0 : -1;
}
/*
* TODO(sjg@chromium.org): Remove this legacy function. At present it is needed
* to support boards which use driver model for USB but not Ethernet, and want
* to use USB Ethernet.
*
* The #if clause is here to ensure that remains the only case.
*/
#if !defined(CONFIG_DM_ETH) && defined(CONFIG_USB_HOST_ETHER)
static struct usb_device *find_child_devnum(struct udevice *parent, int devnum)
{
struct usb_device *udev;
struct udevice *dev;
if (!device_active(parent))
return NULL;
udev = dev_get_parent_priv(parent);
if (udev->devnum == devnum)
return udev;
for (device_find_first_child(parent, &dev);
dev;
device_find_next_child(&dev)) {
udev = find_child_devnum(dev, devnum);
if (udev)
return udev;
}
return NULL;
}
struct usb_device *usb_get_dev_index(struct udevice *bus, int index)
{
struct udevice *dev;
int devnum = index + 1; /* Addresses are allocated from 1 on USB */
device_find_first_child(bus, &dev);
if (!dev)
return NULL;
return find_child_devnum(dev, devnum);
}
#endif
int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp)
{
struct usb_plat *plat;
struct udevice *dev;
int ret;
/* Find the old device and remove it */
ret = uclass_find_first_device(UCLASS_USB, &dev);
if (ret)
return ret;
ret = device_remove(dev, DM_REMOVE_NORMAL);
if (ret)
return ret;
plat = dev_get_plat(dev);
plat->init_type = USB_INIT_DEVICE;
ret = device_probe(dev);
if (ret)
return ret;
*ctlrp = dev_get_priv(dev);
return 0;
}
int usb_remove_ehci_gadget(struct ehci_ctrl **ctlrp)
{
struct udevice *dev;
int ret;
/* Find the old device and remove it */
ret = uclass_find_first_device(UCLASS_USB, &dev);
if (ret)
return ret;
ret = device_remove(dev, DM_REMOVE_NORMAL);
if (ret)
return ret;
*ctlrp = NULL;
return 0;
}
/* returns 0 if no match, 1 if match */
static int usb_match_device(const struct usb_device_descriptor *desc,
const struct usb_device_id *id)
{
if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
id->idVendor != desc->idVendor)
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
id->idProduct != desc->idProduct)
return 0;
/* No need to test id->bcdDevice_lo != 0, since 0 is never
greater than any unsigned number. */
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
(id->bcdDevice_lo > desc->bcdDevice))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
(id->bcdDevice_hi < desc->bcdDevice))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
(id->bDeviceClass != desc->bDeviceClass))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
(id->bDeviceSubClass != desc->bDeviceSubClass))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
(id->bDeviceProtocol != desc->bDeviceProtocol))
return 0;
return 1;
}
/* returns 0 if no match, 1 if match */
static int usb_match_one_id_intf(const struct usb_device_descriptor *desc,
const struct usb_interface_descriptor *int_desc,
const struct usb_device_id *id)
{
/* The interface class, subclass, protocol and number should never be
* checked for a match if the device class is Vendor Specific,
* unless the match record specifies the Vendor ID. */
if (desc->bDeviceClass == USB_CLASS_VENDOR_SPEC &&
!(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
(id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
USB_DEVICE_ID_MATCH_INT_SUBCLASS |
USB_DEVICE_ID_MATCH_INT_PROTOCOL |
USB_DEVICE_ID_MATCH_INT_NUMBER)))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
(id->bInterfaceClass != int_desc->bInterfaceClass))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
(id->bInterfaceSubClass != int_desc->bInterfaceSubClass))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
(id->bInterfaceProtocol != int_desc->bInterfaceProtocol))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) &&
(id->bInterfaceNumber != int_desc->bInterfaceNumber))
return 0;
return 1;
}
/* returns 0 if no match, 1 if match */
static int usb_match_one_id(struct usb_device_descriptor *desc,
struct usb_interface_descriptor *int_desc,
const struct usb_device_id *id)
{
if (!usb_match_device(desc, id))
return 0;
return usb_match_one_id_intf(desc, int_desc, id);
}
static ofnode usb_get_ofnode(struct udevice *hub, int port)
{
ofnode node;
u32 reg;
if (!dev_has_ofnode(hub))
return ofnode_null();
/*
* The USB controller and its USB hub are two different udevices,
* but the device tree has only one node for both. Thus we are
* assigning this node to both udevices.
* If port is zero, the controller scans its root hub, thus we
* are using the same ofnode as the controller here.
*/
if (!port)
return dev_ofnode(hub);
ofnode_for_each_subnode(node, dev_ofnode(hub)) {
if (ofnode_read_u32(node, "reg", &reg))
continue;
if (reg == port)
return node;
}
return ofnode_null();
}
/**
* usb_find_and_bind_driver() - Find and bind the right USB driver
*
* This only looks at certain fields in the descriptor.
*/
static int usb_find_and_bind_driver(struct udevice *parent,
struct usb_device_descriptor *desc,
struct usb_interface_descriptor *iface,
int bus_seq, int devnum, int port,
struct udevice **devp)
{
struct usb_driver_entry *start, *entry;
int n_ents;
int ret;
char name[30], *str;
ofnode node = usb_get_ofnode(parent, port);
*devp = NULL;
debug("%s: Searching for driver\n", __func__);
start = ll_entry_start(struct usb_driver_entry, usb_driver_entry);
n_ents = ll_entry_count(struct usb_driver_entry, usb_driver_entry);
for (entry = start; entry != start + n_ents; entry++) {
const struct usb_device_id *id;
struct udevice *dev;
const struct driver *drv;
struct usb_dev_plat *plat;
for (id = entry->match; id->match_flags; id++) {
if (!usb_match_one_id(desc, iface, id))
continue;
drv = entry->driver;
/*
* We could pass the descriptor to the driver as
* plat (instead of NULL) and allow its bind()
* method to return -ENOENT if it doesn't support this
* device. That way we could continue the search to
* find another driver. For now this doesn't seem
* necesssary, so just bind the first match.
*/
ret = device_bind(parent, drv, drv->name, NULL, node,
&dev);
if (ret)
goto error;
debug("%s: Match found: %s\n", __func__, drv->name);
dev->driver_data = id->driver_info;
plat = dev_get_parent_plat(dev);
plat->id = *id;
*devp = dev;
return 0;
}
}
/* Bind a generic driver so that the device can be used */
snprintf(name, sizeof(name), "generic_bus_%x_dev_%x", bus_seq, devnum);
str = strdup(name);
if (!str)
return -ENOMEM;
ret = device_bind_driver(parent, "usb_dev_generic_drv", str, devp);
error:
debug("%s: No match found: %d\n", __func__, ret);
return ret;
}
/**
* usb_find_child() - Find an existing device which matches our needs
*
*
*/
static int usb_find_child(struct udevice *parent,
struct usb_device_descriptor *desc,
struct usb_interface_descriptor *iface,
struct udevice **devp)
{
struct udevice *dev;
*devp = NULL;
for (device_find_first_child(parent, &dev);
dev;
device_find_next_child(&dev)) {
struct usb_dev_plat *plat = dev_get_parent_plat(dev);
/* If this device is already in use, skip it */
if (device_active(dev))
continue;
debug(" %s: name='%s', plat=%d, desc=%d\n", __func__,
dev->name, plat->id.bDeviceClass, desc->bDeviceClass);
if (usb_match_one_id(desc, iface, &plat->id)) {
*devp = dev;
return 0;
}
}
return -ENOENT;
}
int usb_scan_device(struct udevice *parent, int port,
enum usb_device_speed speed, struct udevice **devp)
{
struct udevice *dev;
bool created = false;
struct usb_dev_plat *plat;
struct usb_bus_priv *priv;
struct usb_device *parent_udev;
int ret;
ALLOC_CACHE_ALIGN_BUFFER(struct usb_device, udev, 1);
struct usb_interface_descriptor *iface = &udev->config.if_desc[0].desc;
*devp = NULL;
memset(udev, '\0', sizeof(*udev));
udev->controller_dev = usb_get_bus(parent);
priv = dev_get_uclass_priv(udev->controller_dev);
/*
* Somewhat nasty, this. We create a local device and use the normal
* USB stack to read its descriptor. Then we know what type of device
* to create for real.
*
* udev->dev is set to the parent, since we don't have a real device
* yet. The USB stack should not access udev.dev anyway, except perhaps
* to find the controller, and the controller will either be @parent,
* or some parent of @parent.
*
* Another option might be to create the device as a generic USB
* device, then morph it into the correct one when we know what it
* should be. This means that a generic USB device would morph into
* a network controller, or a USB flash stick, for example. However,
* we don't support such morphing and it isn't clear that it would
* be easy to do.
*
* Yet another option is to split out the USB stack parts of udev
* into something like a 'struct urb' (as Linux does) which can exist
* independently of any device. This feels cleaner, but calls for quite
* a big change to the USB stack.
*
* For now, the approach is to set up an empty udev, read its
* descriptor and assign it an address, then bind a real device and
* stash the resulting information into the device's parent
* platform data. Then when we probe it, usb_child_pre_probe() is called
* and it will pull the information out of the stash.
*/
udev->dev = parent;
udev->speed = speed;
udev->devnum = priv->next_addr + 1;
udev->portnr = port;
debug("Calling usb_setup_device(), portnr=%d\n", udev->portnr);
parent_udev = device_get_uclass_id(parent) == UCLASS_USB_HUB ?
dev_get_parent_priv(parent) : NULL;
ret = usb_setup_device(udev, priv->desc_before_addr, parent_udev);
debug("read_descriptor for '%s': ret=%d\n", parent->name, ret);
if (ret)
return ret;
ret = usb_find_child(parent, &udev->descriptor, iface, &dev);
debug("** usb_find_child returns %d\n", ret);
if (ret) {
if (ret != -ENOENT)
return ret;
ret = usb_find_and_bind_driver(parent, &udev->descriptor,
iface,
dev_seq(udev->controller_dev),
udev->devnum, port, &dev);
if (ret)
return ret;
created = true;
}
plat = dev_get_parent_plat(dev);
debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat);
plat->devnum = udev->devnum;
plat->udev = udev;
priv->next_addr++;
ret = device_probe(dev);
if (ret) {
debug("%s: Device '%s' probe failed\n", __func__, dev->name);
priv->next_addr--;
if (created)
device_unbind(dev);
return ret;
}
*devp = dev;
return 0;
}
/*
* Detect if a USB device has been plugged or unplugged.
*/
int usb_detect_change(void)
{
struct udevice *hub;
struct uclass *uc;
int change = 0;
int ret;
ret = uclass_get(UCLASS_USB_HUB, &uc);
if (ret)
return ret;
uclass_foreach_dev(hub, uc) {
struct usb_device *udev;
struct udevice *dev;
if (!device_active(hub))
continue;
for (device_find_first_child(hub, &dev);
dev;
device_find_next_child(&dev)) {
struct usb_port_status status;
if (!device_active(dev))
continue;
udev = dev_get_parent_priv(dev);
if (usb_get_port_status(udev, udev->portnr, &status)
< 0)
/* USB request failed */
continue;
if (le16_to_cpu(status.wPortChange) &
USB_PORT_STAT_C_CONNECTION)
change++;
}
}
return change;
}
static int usb_child_post_bind(struct udevice *dev)
{
struct usb_dev_plat *plat = dev_get_parent_plat(dev);
int val;
if (!dev_has_ofnode(dev))
return 0;
/* We only support matching a few things */
val = dev_read_u32_default(dev, "usb,device-class", -1);
if (val != -1) {
plat->id.match_flags |= USB_DEVICE_ID_MATCH_DEV_CLASS;
plat->id.bDeviceClass = val;
}
val = dev_read_u32_default(dev, "usb,interface-class", -1);
if (val != -1) {
plat->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS;
plat->id.bInterfaceClass = val;
}
return 0;
}
struct udevice *usb_get_bus(struct udevice *dev)
{
struct udevice *bus;
for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
bus = bus->parent;
if (!bus) {
/* By design this cannot happen */
assert(bus);
debug("USB HUB '%s' does not have a controller\n", dev->name);
}
return bus;
}
int usb_child_pre_probe(struct udevice *dev)
{
struct usb_device *udev = dev_get_parent_priv(dev);
struct usb_dev_plat *plat = dev_get_parent_plat(dev);
int ret;
if (plat->udev) {
/*
* Copy over all the values set in the on stack struct
* usb_device in usb_scan_device() to our final struct
* usb_device for this dev.
*/
*udev = *(plat->udev);
/* And clear plat->udev as it will not be valid for long */
plat->udev = NULL;
udev->dev = dev;
} else {
/*
* This happens with devices which are explicitly bound
* instead of being discovered through usb_scan_device()
* such as sandbox emul devices.
*/
udev->dev = dev;
udev->controller_dev = usb_get_bus(dev);
udev->devnum = plat->devnum;
/*
* udev did not go through usb_scan_device(), so we need to
* select the config and read the config descriptors.
*/
ret = usb_select_config(udev);
if (ret)
return ret;
}
return 0;
}
UCLASS_DRIVER(usb) = {
.id = UCLASS_USB,
.name = "usb",
.flags = DM_UC_FLAG_SEQ_ALIAS,
.post_bind = dm_scan_fdt_dev,
.priv_auto = sizeof(struct usb_uclass_priv),
.per_child_auto = sizeof(struct usb_device),
.per_device_auto = sizeof(struct usb_bus_priv),
.child_post_bind = usb_child_post_bind,
.child_pre_probe = usb_child_pre_probe,
.per_child_plat_auto = sizeof(struct usb_dev_plat),
};
UCLASS_DRIVER(usb_dev_generic) = {
.id = UCLASS_USB_DEV_GENERIC,
.name = "usb_dev_generic",
};
U_BOOT_DRIVER(usb_dev_generic_drv) = {
.id = UCLASS_USB_DEV_GENERIC,
.name = "usb_dev_generic_drv",
};