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Annotation of src/sys/kern/subr_device.c, Revision 1.2

1.2     ! pooka       1: /*     $NetBSD$        */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2006 The NetBSD Foundation, Inc.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            17:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            18:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            19:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            20:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            21:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            22:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            23:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            24:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            25:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            26:  * POSSIBILITY OF SUCH DAMAGE.
        !            27:  */
        !            28:
        !            29: #include <sys/cdefs.h>
        !            30: __KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.199 2010/01/19 21:54:53 dyoung Exp $");
        !            31:
        !            32: #include <sys/param.h>
        !            33: #include <sys/device.h>
        !            34: #include <sys/systm.h>
        !            35:
        !            36: /*
        !            37:  * Accessor functions for the device_t type.
        !            38:  */
        !            39: devclass_t
        !            40: device_class(device_t dev)
        !            41: {
        !            42:
        !            43:        return dev->dv_class;
        !            44: }
        !            45:
        !            46: cfdata_t
        !            47: device_cfdata(device_t dev)
        !            48: {
        !            49:
        !            50:        return dev->dv_cfdata;
        !            51: }
        !            52:
        !            53: cfdriver_t
        !            54: device_cfdriver(device_t dev)
        !            55: {
        !            56:
        !            57:        return dev->dv_cfdriver;
        !            58: }
        !            59:
        !            60: cfattach_t
        !            61: device_cfattach(device_t dev)
        !            62: {
        !            63:
        !            64:        return dev->dv_cfattach;
        !            65: }
        !            66:
        !            67: int
        !            68: device_unit(device_t dev)
        !            69: {
        !            70:
        !            71:        return dev->dv_unit;
        !            72: }
        !            73:
        !            74: const char *
        !            75: device_xname(device_t dev)
        !            76: {
        !            77:
        !            78:        return dev->dv_xname;
        !            79: }
        !            80:
        !            81: device_t
        !            82: device_parent(device_t dev)
        !            83: {
        !            84:
        !            85:        return dev->dv_parent;
        !            86: }
        !            87:
        !            88: bool
        !            89: device_activation(device_t dev, devact_level_t level)
        !            90: {
        !            91:        int active_flags;
        !            92:
        !            93:        active_flags = DVF_ACTIVE;
        !            94:        switch (level) {
        !            95:        case DEVACT_LEVEL_FULL:
        !            96:                active_flags |= DVF_CLASS_SUSPENDED;
        !            97:                /*FALLTHROUGH*/
        !            98:        case DEVACT_LEVEL_DRIVER:
        !            99:                active_flags |= DVF_DRIVER_SUSPENDED;
        !           100:                /*FALLTHROUGH*/
        !           101:        case DEVACT_LEVEL_BUS:
        !           102:                active_flags |= DVF_BUS_SUSPENDED;
        !           103:                break;
        !           104:        }
        !           105:
        !           106:        return (dev->dv_flags & active_flags) == DVF_ACTIVE;
        !           107: }
        !           108:
        !           109: bool
        !           110: device_is_active(device_t dev)
        !           111: {
        !           112:        int active_flags;
        !           113:
        !           114:        active_flags = DVF_ACTIVE;
        !           115:        active_flags |= DVF_CLASS_SUSPENDED;
        !           116:        active_flags |= DVF_DRIVER_SUSPENDED;
        !           117:        active_flags |= DVF_BUS_SUSPENDED;
        !           118:
        !           119:        return (dev->dv_flags & active_flags) == DVF_ACTIVE;
        !           120: }
        !           121:
        !           122: bool
        !           123: device_is_enabled(device_t dev)
        !           124: {
        !           125:        return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE;
        !           126: }
        !           127:
        !           128: bool
        !           129: device_has_power(device_t dev)
        !           130: {
        !           131:        int active_flags;
        !           132:
        !           133:        active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED;
        !           134:
        !           135:        return (dev->dv_flags & active_flags) == DVF_ACTIVE;
        !           136: }
        !           137:
        !           138: int
        !           139: device_locator(device_t dev, u_int locnum)
        !           140: {
        !           141:
        !           142:        KASSERT(dev->dv_locators != NULL);
        !           143:        return dev->dv_locators[locnum];
        !           144: }
        !           145:
        !           146: void *
        !           147: device_private(device_t dev)
        !           148: {
        !           149:
        !           150:        /*
        !           151:         * The reason why device_private(NULL) is allowed is to simplify the
        !           152:         * work of a lot of userspace request handlers (i.e., c/bdev
        !           153:         * handlers) which grab cfdriver_t->cd_units[n].
        !           154:         * It avoids having them test for it to be NULL and only then calling
        !           155:         * device_private.
        !           156:         */
        !           157:        return dev == NULL ? NULL : dev->dv_private;
        !           158: }
        !           159:
        !           160: prop_dictionary_t
        !           161: device_properties(device_t dev)
        !           162: {
        !           163:
        !           164:        return dev->dv_properties;
        !           165: }
        !           166:
        !           167: /*
        !           168:  * device_is_a:
        !           169:  *
        !           170:  *     Returns true if the device is an instance of the specified
        !           171:  *     driver.
        !           172:  */
        !           173: bool
        !           174: device_is_a(device_t dev, const char *dname)
        !           175: {
        !           176:
        !           177:        return strcmp(dev->dv_cfdriver->cd_name, dname) == 0;
        !           178: }