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Annotation of prex-old/dev/power/cpufreq.c, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 2007, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * cpufreq.c - CPU frequency control
        !            32:  */
        !            33:
        !            34: #include <sys/ioctl.h>
        !            35: #include <driver.h>
        !            36: #include <pm.h>
        !            37: #include "dvs.h"
        !            38:
        !            39: /* #define DEBUG_CPUFREQ 1 */
        !            40:
        !            41: #ifdef DEBUG_CPUFREQ
        !            42: #define cf_printf(fmt, args...) printk("cpufreq: " fmt, ## args)
        !            43: #else
        !            44: #define cf_printf(fmt...)       do {} while (0)
        !            45: #endif
        !            46:
        !            47: static int cpufreq_open(device_t dev, int mode);
        !            48: static int cpufreq_ioctl(device_t dev, int cmd, u_long arg);
        !            49: static int cpufreq_close(device_t dev);
        !            50: static int cpufreq_init(void);
        !            51:
        !            52: /*
        !            53:  * Driver structure
        !            54:  */
        !            55: struct driver cpufreq_drv = {
        !            56:        /* name */      "CPU Frequency Control",
        !            57:        /* order */     3,              /* Must larger than pm driver */
        !            58:        /* init */      cpufreq_init,
        !            59: };
        !            60:
        !            61: static struct devio cpufreq_io = {
        !            62:        /* open */      cpufreq_open,
        !            63:        /* close */     cpufreq_close,
        !            64:        /* read */      NULL,
        !            65:        /* write */     NULL,
        !            66:        /* ioctl */     cpufreq_ioctl,
        !            67:        /* event */     NULL,
        !            68: };
        !            69:
        !            70: static device_t cpufreq_dev;           /* Device object */
        !            71:
        !            72: /*
        !            73:  * Frequecy control policy
        !            74:  */
        !            75: static int cpufreq_policy;
        !            76:
        !            77: static int
        !            78: cpufreq_open(device_t dev, int mode)
        !            79: {
        !            80:
        !            81:        return 0;
        !            82: }
        !            83:
        !            84: static int
        !            85: cpufreq_close(device_t dev)
        !            86: {
        !            87:
        !            88:        return 0;
        !            89: }
        !            90:
        !            91: static int
        !            92: cpufreq_ioctl(device_t dev, int cmd, u_long arg)
        !            93: {
        !            94:
        !            95:        return 0;
        !            96: }
        !            97:
        !            98: void
        !            99: cpufreq_setpolicy(int policy)
        !           100: {
        !           101:
        !           102:        switch (cpufreq_policy) {
        !           103:        case CPUFREQ_ONDEMAND:
        !           104:                if (policy == PM_POWERSAVE)
        !           105:                        dvs_enable();
        !           106:                else
        !           107:                        dvs_disable();
        !           108:
        !           109:                break;
        !           110:        case CPUFREQ_MAXSPEED:
        !           111:                break;
        !           112:        case CPUFREQ_MINSPEED:
        !           113:                break;
        !           114:        }
        !           115: }
        !           116:
        !           117: static int
        !           118: cpufreq_init(void)
        !           119: {
        !           120:        int policy;
        !           121:
        !           122:        /* Create device object */
        !           123:        cpufreq_dev = device_create(&cpufreq_io, "cpufreq", DF_CHR);
        !           124:        ASSERT(cpufreq_dev);
        !           125:
        !           126:        dvs_init();
        !           127:
        !           128:        policy = pm_getpolicy();
        !           129:        if (policy == PM_POWERSAVE)
        !           130:                dvs_enable();
        !           131:        return 0;
        !           132: }
        !           133: