diff options
| -rw-r--r-- | drivers/usb/host/usb-uclass.c | 206 | ||||
| -rw-r--r-- | include/usb.h | 107 |
2 files changed, 311 insertions, 2 deletions
diff --git a/drivers/usb/host/usb-uclass.c b/drivers/usb/host/usb-uclass.c index 22dcd14316..a86e905b48 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) diff --git a/include/usb.h b/include/usb.h index 9625148b51..6db2140dd5 100644 --- a/include/usb.h +++ b/include/usb.h @@ -412,6 +412,113 @@ int usb_set_interface(struct usb_device *dev, int interface, int alternate); ((usb_pipeendpoint(pipe) * 2) - \ (usb_pipein(pipe) ? 0 : 1)) +/** + * struct usb_device_id - identifies USB devices for probing and hotplugging + * @match_flags: Bit mask controlling which of the other fields are used to + * match against new devices. Any field except for driver_info may be + * used, although some only make sense in conjunction with other fields. + * This is usually set by a USB_DEVICE_*() macro, which sets all + * other fields in this structure except for driver_info. + * @idVendor: USB vendor ID for a device; numbers are assigned + * by the USB forum to its members. + * @idProduct: Vendor-assigned product ID. + * @bcdDevice_lo: Low end of range of vendor-assigned product version numbers. + * This is also used to identify individual product versions, for + * a range consisting of a single device. + * @bcdDevice_hi: High end of version number range. The range of product + * versions is inclusive. + * @bDeviceClass: Class of device; numbers are assigned + * by the USB forum. Products may choose to implement classes, + * or be vendor-specific. Device classes specify behavior of all + * the interfaces on a device. + * @bDeviceSubClass: Subclass of device; associated with bDeviceClass. + * @bDeviceProtocol: Protocol of device; associated with bDeviceClass. + * @bInterfaceClass: Class of interface; numbers are assigned + * by the USB forum. Products may choose to implement classes, + * or be vendor-specific. Interface classes specify behavior only + * of a given interface; other interfaces may support other classes. + * @bInterfaceSubClass: Subclass of interface; associated with bInterfaceClass. + * @bInterfaceProtocol: Protocol of interface; associated with bInterfaceClass. + * @bInterfaceNumber: Number of interface; composite devices may use + * fixed interface numbers to differentiate between vendor-specific + * interfaces. + * @driver_info: Holds information used by the driver. Usually it holds + * a pointer to a descriptor understood by the driver, or perhaps + * device flags. + * + * In most cases, drivers will create a table of device IDs by using + * USB_DEVICE(), or similar macros designed for that purpose. + * They will then export it to userspace using MODULE_DEVICE_TABLE(), + * and provide it to the USB core through their usb_driver structure. + * + * See the usb_match_id() function for information about how matches are + * performed. Briefly, you will normally use one of several macros to help + * construct these entries. Each entry you provide will either identify + * one or more specific products, or will identify a class of products + * which have agreed to behave the same. You should put the more specific + * matches towards the beginning of your table, so that driver_info can + * record quirks of specific products. + */ +struct usb_device_id { + /* which fields to match against? */ + u16 match_flags; + + /* Used for product specific matches; range is inclusive */ + u16 idVendor; + u16 idProduct; + u16 bcdDevice_lo; + u16 bcdDevice_hi; + + /* Used for device class matches */ + u8 bDeviceClass; + u8 bDeviceSubClass; + u8 bDeviceProtocol; + + /* Used for interface class matches */ + u8 bInterfaceClass; + u8 bInterfaceSubClass; + u8 bInterfaceProtocol; + + /* Used for vendor-specific interface matches */ + u8 bInterfaceNumber; + + /* not matched against */ + ulong driver_info; +}; + +/* Some useful macros to use to create struct usb_device_id */ +#define USB_DEVICE_ID_MATCH_VENDOR 0x0001 +#define USB_DEVICE_ID_MATCH_PRODUCT 0x0002 +#define USB_DEVICE_ID_MATCH_DEV_LO 0x0004 +#define USB_DEVICE_ID_MATCH_DEV_HI 0x0008 +#define USB_DEVICE_ID_MATCH_DEV_CLASS 0x0010 +#define USB_DEVICE_ID_MATCH_DEV_SUBCLASS 0x0020 +#define USB_DEVICE_ID_MATCH_DEV_PROTOCOL 0x0040 +#define USB_DEVICE_ID_MATCH_INT_CLASS 0x0080 +#define USB_DEVICE_ID_MATCH_INT_SUBCLASS 0x0100 +#define USB_DEVICE_ID_MATCH_INT_PROTOCOL 0x0200 +#define USB_DEVICE_ID_MATCH_INT_NUMBER 0x0400 + +/* Match anything, indicates this is a valid entry even if everything is 0 */ +#define USB_DEVICE_ID_MATCH_NONE 0x0800 +#define USB_DEVICE_ID_MATCH_ALL 0x07ff + +/** + * struct usb_driver_entry - Matches a driver to its usb_device_ids + * @compatible: Compatible string + * @data: Data for this compatible string + */ +struct usb_driver_entry { + struct driver *driver; + const struct usb_device_id *match; +}; + +#define USB_DEVICE(__name, __match) \ + ll_entry_declare(struct usb_driver_entry, __name, usb_driver_entry) = {\ + .driver = llsym(struct driver, __name, driver), \ + .match = __match, \ + } + /************************************************************************* * Hub Stuff */ |
