/*
 *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
 *  (C) 2010       Thomas Renninger <trenn@suse.de>
 *
 *  Licensed under the terms of the GNU GPL License version 2.
 */


#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <cpufreq.h>

#include "helpers/helpers.h"
#include "helpers/sysfs.h"
#include "helpers/bitmask.h"

#define LINE_LEN 10

static void cpuidle_cpu_output(unsigned int cpu, int verbose)
{
	int idlestates, idlestate;
	char *tmp;

	printf(_ ("Analyzing CPU %d:\n"), cpu);

	idlestates = sysfs_get_idlestate_count(cpu);
	if (idlestates == 0) {
		printf(_("CPU %u: No idle states\n"), cpu);
		return;
	} else if (idlestates <= 0) {
		printf(_("CPU %u: Can't read idle state info\n"), cpu);
		return;
	}
	tmp = sysfs_get_idlestate_name(cpu, idlestates - 1);
	if (!tmp) {
		printf(_("Could not determine max idle state %u\n"),
		       idlestates - 1);
		return;
	}

	printf(_("Number of idle states: %d\n"), idlestates);

	printf(_("Available idle states:"));
	for (idlestate = 1; idlestate < idlestates; idlestate++) {
		tmp = sysfs_get_idlestate_name(cpu, idlestate);
		if (!tmp)
			continue;
		printf(" %s", tmp);
		free(tmp);
	}
	printf("\n");

	if (!verbose)
		return;

	for (idlestate = 1; idlestate < idlestates; idlestate++) {
		tmp = sysfs_get_idlestate_name(cpu, idlestate);
		if (!tmp)
			continue;
		printf("%s:\n", tmp);
		free(tmp);

		tmp = sysfs_get_idlestate_desc(cpu, idlestate);
		if (!tmp)
			continue;
		printf(_("Flags/Description: %s\n"), tmp);
		free(tmp);

		printf(_("Latency: %lu\n"),
		       sysfs_get_idlestate_latency(cpu, idlestate));
		printf(_("Usage: %lu\n"),
		       sysfs_get_idlestate_usage(cpu, idlestate));
		printf(_("Duration: %llu\n"),
		       sysfs_get_idlestate_time(cpu, idlestate));
	}
	printf("\n");
}

static void cpuidle_general_output(void)
{
	char *tmp;

	tmp = sysfs_get_cpuidle_driver();
	if (!tmp) {
		printf(_("Could not determine cpuidle driver\n"));
		return;
	}

	printf(_("CPUidle driver: %s\n"), tmp);
	free(tmp);

	tmp = sysfs_get_cpuidle_governor();
	if (!tmp) {
		printf(_("Could not determine cpuidle governor\n"));
		return;
	}

	printf(_("CPUidle governor: %s\n"), tmp);
	free(tmp);
}

static void proc_cpuidle_cpu_output(unsigned int cpu)
{
	long max_allowed_cstate = 2000000000;
	int cstates, cstate;

	cstates = sysfs_get_idlestate_count(cpu);
	if (cstates == 0) {
		/*
		 * Go on and print same useless info as you'd see with
		 * cat /proc/acpi/processor/../power
		 *	printf(_("CPU %u: No C-states available\n"), cpu);
		 *	return;
		 */
	} else if (cstates <= 0) {
		printf(_("CPU %u: Can't read C-state info\n"), cpu);
		return;
	}
	/* printf("Cstates: %d\n", cstates); */

	printf(_("active state:            C0\n"));
	printf(_("max_cstate:              C%u\n"), cstates-1);
	printf(_("maximum allowed latency: %lu usec\n"), max_allowed_cstate);
	printf(_("states:\t\n"));
	for (cstate = 1; cstate < cstates; cstate++) {
		printf(_("    C%d:                  "
			 "type[C%d] "), cstate, cstate);
		printf(_("promotion[--] demotion[--] "));
		printf(_("latency[%03lu] "),
		       sysfs_get_idlestate_latency(cpu, cstate));
		printf(_("usage[%08lu] "),
		       sysfs_get_idlestate_usage(cpu, cstate));
		printf(_("duration[%020Lu] \n"),
		       sysfs_get_idlestate_time(cpu, cstate));
	}
}

/* --freq / -f */

void idle_info_help(void)
{
	printf(_ ("Usage: cpupower idleinfo [options]\n"));
	printf(_ ("Options:\n"));
	printf(_ ("  -s, --silent         Only show general C-state information\n"));
	printf(_ ("  -o, --proc           Prints out information like provided by the /proc/acpi/processor/*/power\n"
	       "                       interface in older kernels\n"));
	printf(_ ("  -h, --help           Prints out this screen\n"));

	printf("\n");
}

static struct option info_opts[] = {
	{ .name = "silent",	.has_arg = no_argument,	.flag = NULL,	.val = 's'},
	{ .name = "proc",	.has_arg = no_argument,	.flag = NULL,	.val = 'o'},
	{ .name = "help",	.has_arg = no_argument,	.flag = NULL,	.val = 'h'},
	{ },
};

static inline void cpuidle_exit(int fail)
{
	idle_info_help();
	exit(EXIT_FAILURE);
}

int cmd_idle_info(int argc, char **argv)
{
	extern char *optarg;
	extern int optind, opterr, optopt;
	int ret = 0, cont = 1, output_param = 0, verbose = 1;
	unsigned int cpu = 0;

	do {
		ret = getopt_long(argc, argv, "hos", info_opts, NULL);
		if (ret == -1)
			break;
		switch (ret) {
		case '?':
			output_param = '?';
			cont = 0;
			break;
		case 'h':
			output_param = 'h';
			cont = 0;
			break;
		case 's':
			verbose = 0;
			break;
		case -1:
			cont = 0;
			break;
		case 'o':
			if (output_param) {
				output_param = -1;
				cont = 0;
				break;
			}
			output_param = ret;
			break;
		}
	} while (cont);

	switch (output_param) {
	case -1:
		printf(_("You can't specify more than one "
			 "output-specific argument\n"));
		cpuidle_exit(EXIT_FAILURE);
	case '?':
		printf(_("invalid or unknown argument\n"));
		cpuidle_exit(EXIT_FAILURE);
	case 'h':
		cpuidle_exit(EXIT_SUCCESS);
	}

	/* Default is: show output of CPU 0 only */
	if (bitmask_isallclear(cpus_chosen))
		bitmask_setbit(cpus_chosen, 0);

	if (output_param == 0)
		cpuidle_general_output();

	for (cpu = bitmask_first(cpus_chosen);
	     cpu <= bitmask_last(cpus_chosen); cpu++) {

		if (!bitmask_isbitset(cpus_chosen, cpu) ||
		    cpufreq_cpu_exists(cpu))
			continue;

		switch (output_param) {

		case 'o':
			proc_cpuidle_cpu_output(cpu);
			break;
		case 0:
			printf("\n");
			cpuidle_cpu_output(cpu, verbose);
			break;
		}
	}
	return EXIT_SUCCESS;
}