HelenOS sources

root/uspace/lib/usbdev/src/recognise.c

DEFINITIONS

1. usb_add_match_id
2. usb_device_create_match_ids_from_interface
3. usb_device_create_match_ids_from_device_descriptor
4. usb_device_create_match_ids

/*
 * Copyright (c) 2010 Vojtech Horky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libusbdev
 * @{
 */
/** @file
 * Functions for recognition of attached devices.
 */

#include <usb/dev/pipes.h>
#include <usb/dev/recognise.h>
#include <usb/dev/request.h>
#include <usb/classes/classes.h>

#include <assert.h>
#include <errno.h>
#include <stdio.h>

/** Get integer part from BCD coded number. */
#define BCD_INT(a) (((unsigned int)(a)) / 256)
/** Get fraction part from BCD coded number (as an integer, no less). */
#define BCD_FRAC(a) (((unsigned int)(a)) % 256)

/** Format for BCD coded number to be used in printf. */
#define BCD_FMT "%x.%x"
/** Arguments to printf for BCD coded number. */
#define BCD_ARGS(a) BCD_INT((a)), BCD_FRAC((a))

/** Add formatted match id.
 *
 * @param matches List of match ids where to add to.
 * @param score Score of the match.
 * @param format Printf-like format
 * @return Error code.
 */
static errno_t usb_add_match_id(match_id_list_t *matches, int score,
    char *match_str)
{
        assert(matches);

        match_id_t *match_id = create_match_id();
        if (match_id == NULL) {
                return ENOMEM;
        }

        match_id->id = match_str;
        match_id->score = score;
        add_match_id(matches, match_id);

        return EOK;
}

/** Add match id to list or return with error code.
 *
 * @param match_ids List of match ids.
 * @param score Match id score.
 * @param format Format of the matching string
 * @param ... Arguments for the format.
 */
#define ADD_MATCHID_OR_RETURN(match_ids, score, format, ...) \
        do { \
                char *str = NULL; \
                int __rc = asprintf(&str, format, ##__VA_ARGS__); \
                if (__rc >= 0) { \
                        errno_t __rc = usb_add_match_id((match_ids), (score), str); \
                        if (__rc != EOK) { \
                                free(str); \
                                return __rc; \
                        } \
                } else { \
                        return ENOMEM; \
                } \
        } while (0)

/** Create device match ids based on its interface.
 *
 * @param[in] desc_device Device descriptor.
 * @param[in] desc_interface Interface descriptor.
 * @param[out] matches Initialized list of match ids.
 * @return Error code (the two mentioned are not the only ones).
 * @retval EINVAL Invalid input parameters (expects non NULL pointers).
 * @retval ENOENT Device class is not "use interface".
 */
errno_t usb_device_create_match_ids_from_interface(
    const usb_standard_device_descriptor_t *desc_device,
    const usb_standard_interface_descriptor_t *desc_interface,
    match_id_list_t *matches)
{
        if (desc_interface == NULL || matches == NULL) {
                return EINVAL;
        }

        if (desc_interface->interface_class == USB_CLASS_USE_INTERFACE) {
                return ENOENT;
        }

        const char *classname = usb_str_class(desc_interface->interface_class);
        assert(classname != NULL);

#define IFACE_PROTOCOL_FMT "interface&class=%s&subclass=0x%02x&protocol=0x%02x"
#define IFACE_PROTOCOL_ARGS classname, desc_interface->interface_subclass, \
    desc_interface->interface_protocol

#define IFACE_SUBCLASS_FMT "interface&class=%s&subclass=0x%02x"
#define IFACE_SUBCLASS_ARGS classname, desc_interface->interface_subclass

#define IFACE_CLASS_FMT "interface&class=%s"
#define IFACE_CLASS_ARGS classname

#define VENDOR_RELEASE_FMT "vendor=0x%04x&product=0x%04x&release=" BCD_FMT
#define VENDOR_RELEASE_ARGS desc_device->vendor_id, desc_device->product_id, \
    BCD_ARGS(desc_device->device_version)

#define VENDOR_PRODUCT_FMT "vendor=0x%04x&product=0x%04x"
#define VENDOR_PRODUCT_ARGS desc_device->vendor_id, desc_device->product_id

#define VENDOR_ONLY_FMT "vendor=0x%04x"
#define VENDOR_ONLY_ARGS desc_device->vendor_id

        /*
         * If the vendor is specified, create match ids with vendor with
         * higher score.
         * Then the same ones without the vendor part.
         */
        if ((desc_device != NULL) && (desc_device->vendor_id != 0)) {
                /* First, interface matches with device release number. */
                ADD_MATCHID_OR_RETURN(matches, 250,
                    "usb&" VENDOR_RELEASE_FMT "&" IFACE_PROTOCOL_FMT,
                    VENDOR_RELEASE_ARGS, IFACE_PROTOCOL_ARGS);
                ADD_MATCHID_OR_RETURN(matches, 240,
                    "usb&" VENDOR_RELEASE_FMT "&" IFACE_SUBCLASS_FMT,
                    VENDOR_RELEASE_ARGS, IFACE_SUBCLASS_ARGS);
                ADD_MATCHID_OR_RETURN(matches, 230,
                    "usb&" VENDOR_RELEASE_FMT "&" IFACE_CLASS_FMT,
                    VENDOR_RELEASE_ARGS, IFACE_CLASS_ARGS);

                /* Next, interface matches without release number. */
                ADD_MATCHID_OR_RETURN(matches, 220,
                    "usb&" VENDOR_PRODUCT_FMT "&" IFACE_PROTOCOL_FMT,
                    VENDOR_PRODUCT_ARGS, IFACE_PROTOCOL_ARGS);
                ADD_MATCHID_OR_RETURN(matches, 210,
                    "usb&" VENDOR_PRODUCT_FMT "&" IFACE_SUBCLASS_FMT,
                    VENDOR_PRODUCT_ARGS, IFACE_SUBCLASS_ARGS);
                ADD_MATCHID_OR_RETURN(matches, 200,
                    "usb&" VENDOR_PRODUCT_FMT "&" IFACE_CLASS_FMT,
                    VENDOR_PRODUCT_ARGS, IFACE_CLASS_ARGS);

                /* Finally, interface matches with only vendor. */
                ADD_MATCHID_OR_RETURN(matches, 190,
                    "usb&" VENDOR_ONLY_FMT "&" IFACE_PROTOCOL_FMT,
                    VENDOR_ONLY_ARGS, IFACE_PROTOCOL_ARGS);
                ADD_MATCHID_OR_RETURN(matches, 180,
                    "usb&" VENDOR_ONLY_FMT "&" IFACE_SUBCLASS_FMT,
                    VENDOR_ONLY_ARGS, IFACE_SUBCLASS_ARGS);
                ADD_MATCHID_OR_RETURN(matches, 170,
                    "usb&" VENDOR_ONLY_FMT "&" IFACE_CLASS_FMT,
                    VENDOR_ONLY_ARGS, IFACE_CLASS_ARGS);
        }

        /* Now, the same but without any vendor specification. */
        ADD_MATCHID_OR_RETURN(matches, 160,
            "usb&" IFACE_PROTOCOL_FMT,
            IFACE_PROTOCOL_ARGS);
        ADD_MATCHID_OR_RETURN(matches, 150,
            "usb&" IFACE_SUBCLASS_FMT,
            IFACE_SUBCLASS_ARGS);
        ADD_MATCHID_OR_RETURN(matches, 140,
            "usb&" IFACE_CLASS_FMT,
            IFACE_CLASS_ARGS);

#undef IFACE_PROTOCOL_FMT
#undef IFACE_PROTOCOL_ARGS
#undef IFACE_SUBCLASS_FMT
#undef IFACE_SUBCLASS_ARGS
#undef IFACE_CLASS_FMT
#undef IFACE_CLASS_ARGS
#undef VENDOR_RELEASE_FMT
#undef VENDOR_RELEASE_ARGS
#undef VENDOR_PRODUCT_FMT
#undef VENDOR_PRODUCT_ARGS
#undef VENDOR_ONLY_FMT
#undef VENDOR_ONLY_ARGS

        /* As a last resort, try fallback driver. */
        ADD_MATCHID_OR_RETURN(matches, 10, "usb&interface&fallback");

        return EOK;
}

/** Create DDF match ids from USB device descriptor.
 *
 * @param matches List of match ids to extend.
 * @param device_descriptor Device descriptor returned by given device.
 * @return Error code.
 */
errno_t usb_device_create_match_ids_from_device_descriptor(
    const usb_standard_device_descriptor_t *device_descriptor,
    match_id_list_t *matches)
{
        /*
         * Unless the vendor id is 0, the pair idVendor-idProduct
         * quite uniquely describes the device.
         */
        if (device_descriptor->vendor_id != 0) {
                /* First, with release number. */
                ADD_MATCHID_OR_RETURN(matches, 100,
                    "usb&vendor=0x%04x&product=0x%04x&release=" BCD_FMT,
                    (int) device_descriptor->vendor_id,
                    (int) device_descriptor->product_id,
                    BCD_ARGS(device_descriptor->device_version));

                /* Next, without release number. */
                ADD_MATCHID_OR_RETURN(matches, 90,
                    "usb&vendor=0x%04x&product=0x%04x",
                    (int) device_descriptor->vendor_id,
                    (int) device_descriptor->product_id);
        }

        /* Class match id */
        ADD_MATCHID_OR_RETURN(matches, 50, "usb&class=%s",
            usb_str_class(device_descriptor->device_class));

        /* As a last resort, try fallback driver. */
        ADD_MATCHID_OR_RETURN(matches, 10, "usb&fallback");

        return EOK;
}

/** Create match ids describing attached device.
 *
 * @warning The list of match ids @p matches may change even when
 * function exits with error.
 *
 * @param ctrl_pipe Control pipe to given device (session must be already
 *      started).
 * @param matches Initialized list of match ids.
 * @return Error code.
 */
errno_t usb_device_create_match_ids(usb_pipe_t *ctrl_pipe,
    match_id_list_t *matches)
{
        assert(ctrl_pipe);
        errno_t rc;
        /*
         * Retrieve device descriptor and add matches from it.
         */
        usb_standard_device_descriptor_t device_descriptor;

        rc = usb_request_get_device_descriptor(ctrl_pipe, &device_descriptor);
        if (rc != EOK) {
                return rc;
        }

        rc = usb_device_create_match_ids_from_device_descriptor(
            &device_descriptor, matches);
        if (rc != EOK) {
                return rc;
        }

        return EOK;
}

/**
 * @}
 */