1 // SPDX-License-Identifier: GPL-2.0-only
3  *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
37 					     const char *value, size_t len)  in sysfs_cpufreq_write_file()  argument
47 	if (fd == -1)  in sysfs_cpufreq_write_file()
50 	numwrite = write(fd, value, len);  in sysfs_cpufreq_write_file()
92 	unsigned int len;  in cpufreq_get_sysfs_value_from_table()  local
99 	len = sysfs_cpufreq_read_file(cpu, table[index], linebuf,  in cpufreq_get_sysfs_value_from_table()
102 	if (len == 0)  in cpufreq_get_sysfs_value_from_table()
140 	unsigned int len;  in sysfs_cpufreq_get_one_string()  local
145 	len = sysfs_cpufreq_read_file(cpu, cpufreq_string_files[which],  in sysfs_cpufreq_get_one_string()
147 	if (len == 0)  in sysfs_cpufreq_get_one_string()
154 	if (result[strlen(result) - 1] == '\n')  in sysfs_cpufreq_get_one_string()
155 		result[strlen(result) - 1] = '\0';  in sysfs_cpufreq_get_one_string()
179 					 const char *new_value, size_t len)  in sysfs_cpufreq_write_one_value()  argument
185 					new_value, len) != len)  in sysfs_cpufreq_write_one_value()
186 		return -ENODEV;  in sysfs_cpufreq_write_one_value()
207 				unsigned long *min,  in cpufreq_get_hardware_limits()  argument
210 	if ((!min) || (!max))  in cpufreq_get_hardware_limits()
211 		return -EINVAL;  in cpufreq_get_hardware_limits()
213 	*min = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MIN_FREQ);  in cpufreq_get_hardware_limits()
214 	if (!*min)  in cpufreq_get_hardware_limits()
215 		return -ENODEV;  in cpufreq_get_hardware_limits()
219 		return -ENODEV;  in cpufreq_get_hardware_limits()
244 	policy->governor = sysfs_cpufreq_get_one_string(cpu, SCALING_GOVERNOR);  in cpufreq_get_policy()
245 	if (!policy->governor) {  in cpufreq_get_policy()
249 	policy->min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ);  in cpufreq_get_policy()
250 	policy->max = sysfs_cpufreq_get_one_value(cpu, SCALING_MAX_FREQ);  in cpufreq_get_policy()
251 	if ((!policy->min) || (!policy->max)) {  in cpufreq_get_policy()
252 		free(policy->governor);  in cpufreq_get_policy()
262 	if ((!policy) || (!policy->governor))  in cpufreq_put_policy()
265 	free(policy->governor);  in cpufreq_put_policy()
266 	policy->governor = NULL;  in cpufreq_put_policy()
277 	unsigned int len;  in cpufreq_get_available_governors()  local
279 	len = sysfs_cpufreq_read_file(cpu, "scaling_available_governors",  in cpufreq_get_available_governors()
281 	if (len == 0)  in cpufreq_get_available_governors()
285 	for (i = 0; i < len; i++) {  in cpufreq_get_available_governors()
287 			if (i - pos < 2)  in cpufreq_get_available_governors()
290 				current->next = malloc(sizeof(*current));  in cpufreq_get_available_governors()
291 				if (!current->next)  in cpufreq_get_available_governors()
293 				current = current->next;  in cpufreq_get_available_governors()
300 			current->first = first;  in cpufreq_get_available_governors()
301 			current->next = NULL;  in cpufreq_get_available_governors()
303 			current->governor = malloc(i - pos + 1);  in cpufreq_get_available_governors()
304 			if (!current->governor)  in cpufreq_get_available_governors()
307 			memcpy(current->governor, linebuf + pos, i - pos);  in cpufreq_get_available_governors()
308 			current->governor[i - pos] = '\0';  in cpufreq_get_available_governors()
317 		current = first->next;  in cpufreq_get_available_governors()
318 		if (first->governor)  in cpufreq_get_available_governors()
319 			free(first->governor);  in cpufreq_get_available_governors()
333 	tmp = any->first;  in cpufreq_put_available_governors()
335 		next = tmp->next;  in cpufreq_put_available_governors()
336 		if (tmp->governor)  in cpufreq_put_available_governors()
337 			free(tmp->governor);  in cpufreq_put_available_governors()
352 	unsigned int len;  in cpufreq_get_available_frequencies()  local
354 	len = sysfs_cpufreq_read_file(cpu, "scaling_available_frequencies",  in cpufreq_get_available_frequencies()
356 	if (len == 0)  in cpufreq_get_available_frequencies()
360 	for (i = 0; i < len; i++) {  in cpufreq_get_available_frequencies()
362 			if (i - pos < 2)  in cpufreq_get_available_frequencies()
364 			if (i - pos >= SYSFS_PATH_MAX)  in cpufreq_get_available_frequencies()
367 				current->next = malloc(sizeof(*current));  in cpufreq_get_available_frequencies()
368 				if (!current->next)  in cpufreq_get_available_frequencies()
370 				current = current->next;  in cpufreq_get_available_frequencies()
377 			current->first = first;  in cpufreq_get_available_frequencies()
378 			current->next = NULL;  in cpufreq_get_available_frequencies()
380 			memcpy(one_value, linebuf + pos, i - pos);  in cpufreq_get_available_frequencies()
381 			one_value[i - pos] = '\0';  in cpufreq_get_available_frequencies()
382 			if (sscanf(one_value, "%lu", &current->frequency) != 1)  in cpufreq_get_available_frequencies()
393 		current = first->next;  in cpufreq_get_available_frequencies()
408 	unsigned int len;  in cpufreq_get_boost_frequencies()  local
410 	len = sysfs_cpufreq_read_file(cpu, "scaling_boost_frequencies",  in cpufreq_get_boost_frequencies()
412 	if (len == 0)  in cpufreq_get_boost_frequencies()
416 	for (i = 0; i < len; i++) {  in cpufreq_get_boost_frequencies()
418 			if (i - pos < 2)  in cpufreq_get_boost_frequencies()
420 			if (i - pos >= SYSFS_PATH_MAX)  in cpufreq_get_boost_frequencies()
423 				current->next = malloc(sizeof(*current));  in cpufreq_get_boost_frequencies()
424 				if (!current->next)  in cpufreq_get_boost_frequencies()
426 				current = current->next;  in cpufreq_get_boost_frequencies()
433 			current->first = first;  in cpufreq_get_boost_frequencies()
434 			current->next = NULL;  in cpufreq_get_boost_frequencies()
436 			memcpy(one_value, linebuf + pos, i - pos);  in cpufreq_get_boost_frequencies()
437 			one_value[i - pos] = '\0';  in cpufreq_get_boost_frequencies()
438 			if (sscanf(one_value, "%lu", &current->frequency) != 1)  in cpufreq_get_boost_frequencies()
449 		current = first->next;  in cpufreq_get_boost_frequencies()
463 	tmp = any->first;  in cpufreq_put_available_frequencies()
465 		next = tmp->next;  in cpufreq_put_available_frequencies()
484 	unsigned int len;  in sysfs_get_cpu_list()  local
486 	len = sysfs_cpufreq_read_file(cpu, file, linebuf, sizeof(linebuf));  in sysfs_get_cpu_list()
487 	if (len == 0)  in sysfs_get_cpu_list()
491 	for (i = 0; i < len; i++) {  in sysfs_get_cpu_list()
492 		if (i == len || linebuf[i] == ' ' || linebuf[i] == '\n') {  in sysfs_get_cpu_list()
493 			if (i - pos  < 1)  in sysfs_get_cpu_list()
495 			if (i - pos >= SYSFS_PATH_MAX)  in sysfs_get_cpu_list()
498 				current->next = malloc(sizeof(*current));  in sysfs_get_cpu_list()
499 				if (!current->next)  in sysfs_get_cpu_list()
501 				current = current->next;  in sysfs_get_cpu_list()
508 			current->first = first;  in sysfs_get_cpu_list()
509 			current->next = NULL;  in sysfs_get_cpu_list()
511 			memcpy(one_value, linebuf + pos, i - pos);  in sysfs_get_cpu_list()
512 			one_value[i - pos] = '\0';  in sysfs_get_cpu_list()
514 			if (sscanf(one_value, "%u", &current->cpu) != 1)  in sysfs_get_cpu_list()
525 		current = first->next;  in sysfs_get_cpu_list()
544 	tmp = any->first;  in cpufreq_put_affected_cpus()
546 		next = tmp->next;  in cpufreq_put_affected_cpus()
568 		return -EINVAL;  in verify_gov()
582 		if (new_gov[i] == '-')  in verify_gov()
592 		return -EINVAL;  in verify_gov()
600 	char min[SYSFS_PATH_MAX];  in cpufreq_set_policy()  local
607 	if (!policy || !(policy->governor))  in cpufreq_set_policy()
608 		return -EINVAL;  in cpufreq_set_policy()
610 	if (policy->max < policy->min)  in cpufreq_set_policy()
611 		return -EINVAL;  in cpufreq_set_policy()
613 	if (verify_gov(gov, policy->governor))  in cpufreq_set_policy()
614 		return -EINVAL;  in cpufreq_set_policy()
616 	snprintf(min, SYSFS_PATH_MAX, "%lu", policy->min);  in cpufreq_set_policy()
617 	snprintf(max, SYSFS_PATH_MAX, "%lu", policy->max);  in cpufreq_set_policy()
620 	write_max_first = (old_min && (policy->max < old_min) ? 0 : 1);  in cpufreq_set_policy()
629 	ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ, min,  in cpufreq_set_policy()
630 					    strlen(min));  in cpufreq_set_policy()
672 		return -EINVAL;  in cpufreq_modify_policy_governor()
675 		return -EINVAL;  in cpufreq_modify_policy_governor()
689 		return -ENODEV;  in cpufreq_set_frequency()
691 	if (strncmp(pol->governor, userspace_gov, 9) != 0) {  in cpufreq_set_frequency()
715 	unsigned int len;  in cpufreq_get_stats()  local
717 	len = sysfs_cpufreq_read_file(cpu, "stats/time_in_state",  in cpufreq_get_stats()
719 	if (len == 0)  in cpufreq_get_stats()
724 	for (i = 0; i < len; i++) {  in cpufreq_get_stats()
726 			if (i - pos < 2)  in cpufreq_get_stats()
728 			if ((i - pos) >= SYSFS_PATH_MAX)  in cpufreq_get_stats()
731 				current->next = malloc(sizeof(*current));  in cpufreq_get_stats()
732 				if (!current->next)  in cpufreq_get_stats()
734 				current = current->next;  in cpufreq_get_stats()
741 			current->first = first;  in cpufreq_get_stats()
742 			current->next = NULL;  in cpufreq_get_stats()
744 			memcpy(one_value, linebuf + pos, i - pos);  in cpufreq_get_stats()
745 			one_value[i - pos] = '\0';  in cpufreq_get_stats()
747 					&current->frequency,  in cpufreq_get_stats()
748 					&current->time_in_state) != 2)  in cpufreq_get_stats()
751 			*total_time = *total_time + current->time_in_state;  in cpufreq_get_stats()
760 		current = first->next;  in cpufreq_get_stats()
774 	tmp = any->first;  in cpufreq_put_stats()
776 		next = tmp->next;  in cpufreq_put_stats()