2 * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
4 * Licensed under the terms of the GNU GPL License version 2.
19 #include "helpers/helpers.h"
21 #define NORM_FREQ_LEN 32
23 static struct option set_opts[] = {
24 { .name = "min", .has_arg = required_argument, .flag = NULL, .val = 'd'},
25 { .name = "max", .has_arg = required_argument, .flag = NULL, .val = 'u'},
26 { .name = "governor", .has_arg = required_argument, .flag = NULL, .val = 'g'},
27 { .name = "freq", .has_arg = required_argument, .flag = NULL, .val = 'f'},
28 { .name = "related", .has_arg = no_argument, .flag = NULL, .val='r'},
32 static void print_error(void)
34 printf(_("Error setting new values. Common errors:\n"
35 "- Do you have proper administration rights? (super-user?)\n"
36 "- Is the governor you requested available and modprobed?\n"
37 "- Trying to set an invalid policy?\n"
38 "- Trying to set a specific frequency, but userspace governor is not available,\n"
39 " for example because of hardware which cannot be set to a specific frequency\n"
40 " or because the userspace governor isn't loaded?\n"));
48 const struct freq_units def_units[] = {
50 {"khz", 0}, /* default */
57 static void print_unknown_arg(void)
59 printf(_("invalid or unknown argument\n"));
62 static unsigned long string_to_frequency(const char *str)
64 char normalized[NORM_FREQ_LEN];
65 const struct freq_units *unit;
69 int power = 0, match_count = 0, i, cp, pad;
74 for (scan = str; isdigit(*scan) || *scan == '.'; scan++) {
75 if (*scan == '.' && match_count == 0)
77 else if (*scan == '.' && match_count == 1)
83 for (unit = def_units; unit->str_unit; unit++) {
85 scan[i] && tolower(scan[i]) == unit->str_unit[i];
91 power = unit->power_of_ten;
97 /* count the number of digits to be copied */
98 for (cp = 0; isdigit(str[cp]); cp++)
101 if (str[cp] == '.') {
102 while (power > -1 && isdigit(str[cp+1]))
105 if (power >= -1) /* not enough => pad */
107 else /* to much => strip */
108 pad = 0, cp += power + 1;
110 if (cp <= 0 || cp + pad > NORM_FREQ_LEN - 1)
114 for (i = 0; i < cp; i++, str++) {
117 normalized[i] = *str;
120 for (; i < cp + pad; i++)
123 /* round up, down ? */
124 match_count = (normalized[i-1] >= '5');
125 /* and drop the decimal part */
126 normalized[i-1] = 0; /* cp > 0 && pad >= 0 ==> i > 0 */
128 /* final conversion (and applying rounding) */
130 freq = strtoul(normalized, &end, 10);
134 if (match_count && freq != ULONG_MAX)
140 static int do_new_policy(unsigned int cpu, struct cpufreq_policy *new_pol)
142 struct cpufreq_policy *cur_pol = cpufreq_get_policy(cpu);
146 printf(_("wrong, unknown or unhandled CPU?\n"));
151 new_pol->min = cur_pol->min;
154 new_pol->max = cur_pol->max;
156 if (!new_pol->governor)
157 new_pol->governor = cur_pol->governor;
159 ret = cpufreq_set_policy(cpu, new_pol);
161 cpufreq_put_policy(cur_pol);
167 static int do_one_cpu(unsigned int cpu, struct cpufreq_policy *new_pol,
168 unsigned long freq, unsigned int pc)
172 return cpufreq_set_frequency(cpu, freq);
175 /* if only one value of a policy is to be changed, we can
179 return cpufreq_modify_policy_min(cpu, new_pol->min);
180 else if (new_pol->max)
181 return cpufreq_modify_policy_max(cpu, new_pol->max);
182 else if (new_pol->governor)
183 return cpufreq_modify_policy_governor(cpu,
188 return do_new_policy(cpu, new_pol);
192 int cmd_freq_set(int argc, char **argv)
195 extern int optind, opterr, optopt;
196 int ret = 0, cont = 1;
197 int double_parm = 0, related = 0, policychange = 0;
198 unsigned long freq = 0;
202 struct cpufreq_policy new_pol = {
208 /* parameter parsing */
210 ret = getopt_long(argc, argv, "d:u:g:f:r", set_opts, NULL);
227 new_pol.min = string_to_frequency(optarg);
228 if (new_pol.min == 0) {
237 new_pol.max = string_to_frequency(optarg);
238 if (new_pol.max == 0) {
246 freq = string_to_frequency(optarg);
253 if (new_pol.governor)
256 if ((strlen(optarg) < 3) || (strlen(optarg) > 18)) {
260 if ((sscanf(optarg, "%s", gov)) != 1) {
264 new_pol.governor = gov;
269 /* parameter checking */
271 printf("the same parameter was passed more than once\n");
275 if (freq && policychange) {
276 printf(_("the -f/--freq parameter cannot be combined with -d/--min, -u/--max or\n"
277 "-g/--governor parameters\n"));
281 if (!freq && !policychange) {
282 printf(_("At least one parameter out of -f/--freq, -d/--min, -u/--max, and\n"
283 "-g/--governor must be passed\n"));
287 /* Default is: set all CPUs */
288 if (bitmask_isallclear(cpus_chosen))
289 bitmask_setall(cpus_chosen);
291 /* Also set frequency settings for related CPUs if -r is passed */
293 for (cpu = bitmask_first(cpus_chosen);
294 cpu <= bitmask_last(cpus_chosen); cpu++) {
295 struct cpufreq_affected_cpus *cpus;
297 if (!bitmask_isbitset(cpus_chosen, cpu) ||
298 cpufreq_cpu_exists(cpu))
301 cpus = cpufreq_get_related_cpus(cpu);
305 bitmask_setbit(cpus_chosen, cpus->cpu);
308 cpufreq_put_related_cpus(cpus);
314 for (cpu = bitmask_first(cpus_chosen);
315 cpu <= bitmask_last(cpus_chosen); cpu++) {
317 if (!bitmask_isbitset(cpus_chosen, cpu) ||
318 cpufreq_cpu_exists(cpu))
321 printf(_("Setting cpu: %d\n"), cpu);
322 ret = do_one_cpu(cpu, &new_pol, freq, policychange);