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Annotation of prex-old/dev/power/cpufreq.c, Revision 1.1.1.1

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: