-/*
- * linux/drivers/cpufreq/proc_intf.c
- *
- * Copyright (C) 2002 - 2003 Dominik Brodowski
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/cpufreq.h>
-#include <linux/ctype.h>
-#include <linux/proc_fs.h>
-#include <asm/uaccess.h>
-
-#warning This module will be removed from the 2.6. kernel series soon after 2005-01-01
-
-#define CPUFREQ_ALL_CPUS ((NR_CPUS))
-
-static unsigned int warning_print = 0;
-
-/**
- * cpufreq_parse_policy - parse a policy string
- * @input_string: the string to parse.
- * @policy: the policy written inside input_string
- *
- * This function parses a "policy string" - something the user echo'es into
- * /proc/cpufreq or gives as boot parameter - into a struct cpufreq_policy.
- * If there are invalid/missing entries, they are replaced with current
- * cpufreq policy.
- */
-static int cpufreq_parse_policy(char input_string[42], struct cpufreq_policy *policy)
-{
- unsigned int min = 0;
- unsigned int max = 0;
- unsigned int cpu = 0;
- char str_governor[16];
- struct cpufreq_policy current_policy;
- unsigned int result = -EFAULT;
-
- if (!policy)
- return -EINVAL;
-
- policy->min = 0;
- policy->max = 0;
- policy->policy = 0;
- policy->cpu = CPUFREQ_ALL_CPUS;
-
- if (sscanf(input_string, "%d:%d:%d:%15s", &cpu, &min, &max, str_governor) == 4)
- {
- policy->min = min;
- policy->max = max;
- policy->cpu = cpu;
- result = 0;
- goto scan_policy;
- }
- if (sscanf(input_string, "%d%%%d%%%d%%%15s", &cpu, &min, &max, str_governor) == 4)
- {
- if (!cpufreq_get_policy(¤t_policy, cpu)) {
- policy->min = (min * current_policy.cpuinfo.max_freq) / 100;
- policy->max = (max * current_policy.cpuinfo.max_freq) / 100;
- policy->cpu = cpu;
- result = 0;
- goto scan_policy;
- }
- }
-
- if (sscanf(input_string, "%d:%d:%15s", &min, &max, str_governor) == 3)
- {
- policy->min = min;
- policy->max = max;
- result = 0;
- goto scan_policy;
- }
-
- if (sscanf(input_string, "%d%%%d%%%15s", &min, &max, str_governor) == 3)
- {
- if (!cpufreq_get_policy(¤t_policy, cpu)) {
- policy->min = (min * current_policy.cpuinfo.max_freq) / 100;
- policy->max = (max * current_policy.cpuinfo.max_freq) / 100;
- result = 0;
- goto scan_policy;
- }
- }
-
- return -EINVAL;
-
-scan_policy:
- result = cpufreq_parse_governor(str_governor, &policy->policy, &policy->governor);
-
- return result;
-}
-
-/**
- * cpufreq_proc_read - read /proc/cpufreq
- *
- * This function prints out the current cpufreq policy.
- */
-static int cpufreq_proc_read (
- char *page,
- char **start,
- off_t off,
- int count,
- int *eof,
- void *data)
-{
- char *p = page;
- int len = 0;
- struct cpufreq_policy policy;
- unsigned int min_pctg = 0;
- unsigned int max_pctg = 0;
- unsigned int i = 0;
-
- if (off != 0)
- goto end;
-
- if (!warning_print) {
- warning_print++;
- printk(KERN_INFO "Access to /proc/cpufreq is deprecated and "
- "will be removed from (new) 2.6. kernels soon "
- "after 2005-01-01\n");
- }
-
- p += sprintf(p, " minimum CPU frequency - maximum CPU frequency - policy\n");
- for (i=0;i<NR_CPUS;i++) {
- if (!cpu_online(i))
- continue;
-
- if (cpufreq_get_policy(&policy, i))
- continue;
-
- if (!policy.cpuinfo.max_freq)
- continue;
-
- min_pctg = (policy.min * 100) / policy.cpuinfo.max_freq;
- max_pctg = (policy.max * 100) / policy.cpuinfo.max_freq;
-
- p += sprintf(p, "CPU%3d %9d kHz (%3d %%) - %9d kHz (%3d %%) - ",
- i , policy.min, min_pctg, policy.max, max_pctg);
- if (policy.policy) {
- switch (policy.policy) {
- case CPUFREQ_POLICY_POWERSAVE:
- p += sprintf(p, "powersave\n");
- break;
- case CPUFREQ_POLICY_PERFORMANCE:
- p += sprintf(p, "performance\n");
- break;
- default:
- p += sprintf(p, "INVALID\n");
- break;
- }
- } else
- p += scnprintf(p, CPUFREQ_NAME_LEN, "%s\n", policy.governor->name);
- }
-end:
- len = (p - page);
- if (len <= off+count)
- *eof = 1;
- *start = page + off;
- len -= off;
- if (len>count)
- len = count;
- if (len<0)
- len = 0;
-
- return len;
-}
-
-
-/**
- * cpufreq_proc_write - handles writing into /proc/cpufreq
- *
- * This function calls the parsing script and then sets the policy
- * accordingly.
- */
-static int cpufreq_proc_write (
- struct file *file,
- const char __user *buffer,
- unsigned long count,
- void *data)
-{
- int result = 0;
- char proc_string[42] = {'\0'};
- struct cpufreq_policy policy;
- unsigned int i = 0;
-
-
- if ((count > sizeof(proc_string) - 1))
- return -EINVAL;
-
- if (copy_from_user(proc_string, buffer, count))
- return -EFAULT;
-
- if (!warning_print) {
- warning_print++;
- printk(KERN_INFO "Access to /proc/cpufreq is deprecated and "
- "will be removed from (new) 2.6. kernels soon "
- "after 2005-01-01\n");
- }
-
- proc_string[count] = '\0';
-
- result = cpufreq_parse_policy(proc_string, &policy);
- if (result)
- return -EFAULT;
-
- if (policy.cpu == CPUFREQ_ALL_CPUS)
- {
- for (i=0; i<NR_CPUS; i++)
- {
- policy.cpu = i;
- if (cpu_online(i))
- cpufreq_set_policy(&policy);
- }
- }
- else
- cpufreq_set_policy(&policy);
-
- return count;
-}
-
-
-/**
- * cpufreq_proc_init - add "cpufreq" to the /proc root directory
- *
- * This function adds "cpufreq" to the /proc root directory.
- */
-static int __init cpufreq_proc_init (void)
-{
- struct proc_dir_entry *entry = NULL;
-
- /* are these acceptable values? */
- entry = create_proc_entry("cpufreq", S_IFREG|S_IRUGO|S_IWUSR,
- &proc_root);
-
- if (!entry) {
- printk(KERN_ERR "unable to create /proc/cpufreq entry\n");
- return -EIO;
- } else {
- entry->read_proc = cpufreq_proc_read;
- entry->write_proc = cpufreq_proc_write;
- }
-
- return 0;
-}
-
-
-/**
- * cpufreq_proc_exit - removes "cpufreq" from the /proc root directory.
- *
- * This function removes "cpufreq" from the /proc root directory.
- */
-static void __exit cpufreq_proc_exit (void)
-{
- remove_proc_entry("cpufreq", &proc_root);
- return;
-}
-
-MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
-MODULE_DESCRIPTION ("CPUfreq /proc/cpufreq interface");
-MODULE_LICENSE ("GPL");
-
-module_init(cpufreq_proc_init);
-module_exit(cpufreq_proc_exit);
git://git.onelab.eu / linux-2.6.git / blobdiff