diff options
Diffstat (limited to 'drivers/usb')
-rw-r--r-- | drivers/usb/host/usb-uclass.c | 206 |
1 files changed, 204 insertions, 2 deletions
diff --git a/drivers/usb/host/usb-uclass.c b/drivers/usb/host/usb-uclass.c index 22dcd14..a86e905 100644 --- a/drivers/usb/host/usb-uclass.c +++ b/drivers/usb/host/usb-uclass.c @@ -2,6 +2,8 @@ * (C) Copyright 2015 Google, Inc * Written by Simon Glass <sjg@chromium.org> * + * usb_match_device() modified from Linux kernel v4.0. + * * SPDX-License-Identifier: GPL-2.0+ */ @@ -247,6 +249,179 @@ int usb_legacy_port_reset(struct usb_device *parent, int portnr) return usb_port_reset(parent, portnr); } +/* returns 0 if no match, 1 if match */ +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 != le16_to_cpu(desc->idVendor)) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && + id->idProduct != le16_to_cpu(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 > le16_to_cpu(desc->bcdDevice))) + return 0; + + if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && + (id->bcdDevice_hi < le16_to_cpu(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 */ +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 */ +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); +} + +/** + * 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, + struct udevice **devp) +{ + struct usb_driver_entry *start, *entry; + int n_ents; + int ret; + char name[30], *str; + + *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_platdata *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 + * platdata (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, -1, + &dev); + if (ret) + goto error; + debug("%s: Match found: %s\n", __func__, drv->name); + dev->driver_data = id->driver_info; + plat = dev_get_parent_platdata(dev); + plat->id = *id; + *devp = dev; + return 0; + } + } + + ret = -ENOENT; +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_platdata *plat = dev_get_parent_platdata(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) { @@ -307,9 +482,36 @@ int usb_scan_device(struct udevice *parent, int port, 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, + udev->controller_dev->seq, + udev->devnum, &dev); + if (ret) + return ret; + created = true; + } + plat = dev_get_parent_platdata(dev); + debug("%s: Probing '%s', plat=%p\n", __func__, dev->name, plat); + plat->devnum = udev->devnum; + plat->speed = udev->speed; + plat->slot_id = udev->slot_id; + plat->portnr = port; + debug("** device '%s': stashing slot_id=%d\n", dev->name, + plat->slot_id); + 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; - /* TODO: Find a suitable driver and create the device */ - return -ENOENT; + return 0; } int usb_child_post_bind(struct udevice *dev) |