rtas-proc.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*
 *   arch/ppc64/kernel/rtas-proc.c
 *   Copyright (C) 2000 Tilmann Bitterberg
 *   ([e-mail])
 *
 *   RTAS (Runtime Abstraction Services) stuff
 *   Intention is to provide a clean user interface
 *   to use the RTAS.
 *
 *   TODO:
 *   Split off a header file and maybe move it to a different
 *   location. Write Documentation on what the /proc/rtas/ entries
 *   actually do.
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/ctype.h>
#include <linux/time.h>
#include <linux/string.h>

#include <asm/uaccess.h>
#include <asm/bitops.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/machdep.h> /* for ppc_md */
#include <asm/time.h>

/* Token for Sensors */
#define KEY_SWITCH		0x0001
#define ENCLOSURE_SWITCH	0x0002
#define THERMAL_SENSOR		0x0003
#define LID_STATUS		0x0004
#define POWER_SOURCE		0x0005
#define BATTERY_VOLTAGE		0x0006
#define BATTERY_REMAINING	0x0007
#define BATTERY_PERCENTAGE	0x0008
#define EPOW_SENSOR		0x0009
#define BATTERY_CYCLESTATE	0x000a
#define BATTERY_CHARGING	0x000b

/* IBM specific sensors */
#define IBM_SURVEILLANCE	0x2328 /* 9000 */
#define IBM_FANRPM		0x2329 /* 9001 */
#define IBM_VOLTAGE		0x232a /* 9002 */
#define IBM_DRCONNECTOR		0x232b /* 9003 */
#define IBM_POWERSUPPLY		0x232c /* 9004 */
#define IBM_INTQUEUE		0x232d /* 9005 */

/* Status return values */
#define SENSOR_CRITICAL_HIGH	13
#define SENSOR_WARNING_HIGH	12
#define SENSOR_NORMAL		11
#define SENSOR_WARNING_LOW	10
#define SENSOR_CRITICAL_LOW	 9
#define SENSOR_SUCCESS		 0
#define SENSOR_HW_ERROR		-1
#define SENSOR_BUSY		-2
#define SENSOR_NOT_EXIST	-3
#define SENSOR_DR_ENTITY	-9000

/* Location Codes */
#define LOC_SCSI_DEV_ADDR	'A'
#define LOC_SCSI_DEV_LOC	'B'
#define LOC_CPU			'C'
#define LOC_DISKETTE		'D'
#define LOC_ETHERNET		'E'
#define LOC_FAN			'F'
#define LOC_GRAPHICS		'G'
/* reserved / not used		'H' */
#define LOC_IO_ADAPTER		'I'
/* reserved / not used		'J' */
#define LOC_KEYBOARD		'K'
#define LOC_LCD			'L'
#define LOC_MEMORY		'M'
#define LOC_NV_MEMORY		'N'
#define LOC_MOUSE		'O'
#define LOC_PLANAR		'P'
#define LOC_OTHER_IO		'Q'
#define LOC_PARALLEL		'R'
#define LOC_SERIAL		'S'
#define LOC_DEAD_RING		'T'
#define LOC_RACKMOUNTED		'U' /* for _u_nit is rack mounted */
#define LOC_VOLTAGE		'V'
#define LOC_SWITCH_ADAPTER	'W'
#define LOC_OTHER		'X'
#define LOC_FIRMWARE		'Y'
#define LOC_SCSI		'Z'

/* Tokens for indicators */
#define TONE_FREQUENCY		0x0001 /* 0 - 1000 (HZ)*/
#define TONE_VOLUME		0x0002 /* 0 - 100 (%) */
#define SYSTEM_POWER_STATE	0x0003 
#define WARNING_LIGHT		0x0004
#define DISK_ACTIVITY_LIGHT	0x0005
#define HEX_DISPLAY_UNIT	0x0006
#define BATTERY_WARNING_TIME	0x0007
#define CONDITION_CYCLE_REQUEST	0x0008
#define SURVEILLANCE_INDICATOR	0x2328 /* 9000 */
#define DR_ACTION		0x2329 /* 9001 */
#define DR_INDICATOR		0x232a /* 9002 */
/* 9003 - 9004: Vendor specific */
#define GLOBAL_INTERRUPT_QUEUE	0x232d /* 9005 */
/* 9006 - 9999: Vendor specific */

/* other */
#define MAX_SENSORS		 17  /* I only know of 17 sensors */    
#define MAX_LINELENGTH          256
#define SENSOR_PREFIX		"ibm,sensor-"
#define cel_to_fahr(x)		((x*9/5)+32)


/* Globals */
static struct proc_dir_entry *proc_rtas;
static struct rtas_sensors sensors;
static struct device_node *rtas_node;
static unsigned long power_on_time = 0; /* Save the time the user set */
static char progress_led[MAX_LINELENGTH];

static unsigned long rtas_tone_frequency = 1000;
static unsigned long rtas_tone_volume = 0;

/* ****************STRUCTS******************************************* */
struct individual_sensor {
	unsigned int token;
	unsigned int quant;
};

struct rtas_sensors {
        struct individual_sensor sensor[MAX_SENSORS];
	unsigned int quant;
};

/* ****************************************************************** */
/* Declarations */
static int ppc_rtas_sensor_read(char * buf, char ** start, off_t off,
		int count, int *eof, void *data);
static ssize_t ppc_rtas_clock_read(struct file * file, char * buf, 
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_clock_write(struct file * file, const char * buf, 
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_progress_read(struct file * file, char * buf,
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_progress_write(struct file * file, const char * buf,
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_poweron_read(struct file * file, char * buf,
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_poweron_write(struct file * file, const char * buf,
		size_t count, loff_t *ppos);

static ssize_t ppc_rtas_tone_freq_write(struct file * file, const char * buf,
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_tone_freq_read(struct file * file, char * buf,
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_tone_volume_write(struct file * file, const char * buf,
		size_t count, loff_t *ppos);
static ssize_t ppc_rtas_tone_volume_read(struct file * file, char * buf,
		size_t count, loff_t *ppos);

struct file_operations ppc_rtas_poweron_operations = {
	read:		ppc_rtas_poweron_read,
	write:		ppc_rtas_poweron_write
};
struct file_operations ppc_rtas_progress_operations = {
	read:		ppc_rtas_progress_read,
	write:		ppc_rtas_progress_write
};

struct file_operations ppc_rtas_clock_operations = {
	read:		ppc_rtas_clock_read,
	write:		ppc_rtas_clock_write
};

struct file_operations ppc_rtas_tone_freq_operations = {
	read:		ppc_rtas_tone_freq_read,
	write:		ppc_rtas_tone_freq_write
};
struct file_operations ppc_rtas_tone_volume_operations = {
	read:		ppc_rtas_tone_volume_read,
	write:		ppc_rtas_tone_volume_write
};

int ppc_rtas_find_all_sensors (void);
int ppc_rtas_process_sensor(struct individual_sensor s, int state, 
		int error, char * buf);
char * ppc_rtas_process_error(int error);
int get_location_code(struct individual_sensor s, char * buf);
int check_location_string (char *c, char * buf);
int check_location (char *c, int idx, char * buf);

/* ****************************************************************** */
/* MAIN                                                               */
/* ****************************************************************** */
void proc_rtas_init(void)
{
	struct proc_dir_entry *entry;

	rtas_node = find_devices("rtas");
	if ((rtas_node == 0) || (naca->platform == PLATFORM_ISERIES_LPAR)) {
		return;
	}
	
	proc_rtas = proc_mkdir("rtas", 0);
	if (proc_rtas == 0)
		return;

	/* /proc/rtas entries */

	entry = create_proc_entry("progress", S_IRUGO|S_IWUSR, proc_rtas);
	if (entry) entry->proc_fops = &ppc_rtas_progress_operations;

	entry = create_proc_entry("clock", S_IRUGO|S_IWUSR, proc_rtas); 
	if (entry) entry->proc_fops = &ppc_rtas_clock_operations;

	entry = create_proc_entry("poweron", S_IWUSR|S_IRUGO, proc_rtas); 
	if (entry) entry->proc_fops = &ppc_rtas_poweron_operations;

	create_proc_read_entry("sensors", S_IRUGO, proc_rtas, 
			ppc_rtas_sensor_read, NULL);
	
	entry = create_proc_entry("frequency", S_IWUSR|S_IRUGO, proc_rtas); 
	if (entry) entry->proc_fops = &ppc_rtas_tone_freq_operations;

	entry = create_proc_entry("volume", S_IWUSR|S_IRUGO, proc_rtas); 
	if (entry) entry->proc_fops = &ppc_rtas_tone_volume_operations;
}

/* ****************************************************************** */
/* POWER-ON-TIME                                                      */
/* ****************************************************************** */
static ssize_t ppc_rtas_poweron_write(struct file * file, const char * buf,
		size_t count, loff_t *ppos)
{
	struct rtc_time tm;
	unsigned long nowtime;
	char *dest;
	int error;

	nowtime = simple_strtoul(buf, &dest, 10);
	if (*dest != '\0' && *dest != '\n') {
		printk("ppc_rtas_poweron_write: Invalid time\n");
		return count;
	}
	power_on_time = nowtime; /* save the time */

	to_tm(nowtime, &tm);

	error = rtas_call(rtas_token("set-time-for-power-on"), 7, 1, NULL, 
			tm.tm_year, tm.tm_mon, tm.tm_mday, 
			tm.tm_hour, tm.tm_min, tm.tm_sec, 0 /* nano */);
	if (error != 0)
		printk(KERN_WARNING "error: setting poweron time returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}
/* ****************************************************************** */
static ssize_t ppc_rtas_poweron_read(struct file * file, char * buf,
		size_t count, loff_t *ppos)
{
	int n;
	if (power_on_time == 0)
		n = sprintf(buf, "Power on time not set\n");
	else
		n = sprintf(buf, "%lu\n", power_on_time);

	if (*ppos >= strlen(buf))
		return 0;
	if (n > strlen(buf) - *ppos)
		n = strlen(buf) - *ppos;
	if (n > count)
		n = count;
	*ppos += n;
	return n;
}

/* ****************************************************************** */
/* PROGRESS                                                           */
/* ****************************************************************** */
static ssize_t ppc_rtas_progress_write(struct file * file, const char * buf,
		size_t count, loff_t *ppos)
{
	unsigned long hex;

	strcpy(progress_led, buf); /* save the string */
	/* Lets see if the user passed hexdigits */
	hex = simple_strtoul(buf, NULL, 10);
	
	ppc_md.progress ((char *)buf, hex);
	return count;

	/* clear the line */ /* ppc_md.progress("                   ", 0xffff);*/
}
/* ****************************************************************** */
static ssize_t ppc_rtas_progress_read(struct file * file, char * buf,
		size_t count, loff_t *ppos)
{
	int n = 0;
	if (progress_led != NULL)
		n = sprintf (buf, "%s\n", progress_led);
	if (*ppos >= strlen(buf))
		return 0;
	if (n > strlen(buf) - *ppos)
		n = strlen(buf) - *ppos;
	if (n > count)
		n = count;
	*ppos += n;
	return n;
}

/* ****************************************************************** */
/* CLOCK                                                              */
/* ****************************************************************** */
static ssize_t ppc_rtas_clock_write(struct file * file, const char * buf, 
		size_t count, loff_t *ppos)
{
	struct rtc_time tm;
	unsigned long nowtime;
	char *dest;
	int error;

	nowtime = simple_strtoul(buf, &dest, 10);
	if (*dest != '\0' && *dest != '\n') {
		printk("ppc_rtas_clock_write: Invalid time\n");
		return count;
	}

	to_tm(nowtime, &tm);
	error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL, 
			tm.tm_year, tm.tm_mon, tm.tm_mday, 
			tm.tm_hour, tm.tm_min, tm.tm_sec, 0);
	if (error != 0)
		printk(KERN_WARNING "error: setting the clock returned: %s\n", 
				ppc_rtas_process_error(error));
	return count;
}
/* ****************************************************************** */
static ssize_t ppc_rtas_clock_read(struct file * file, char * buf, 
		size_t count, loff_t *ppos)
{
	unsigned int year, mon, day, hour, min, sec;
	unsigned long *ret = kmalloc(4*8, GFP_KERNEL);
	int n, error;

	error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
	
	year = ret[0]; mon  = ret[1]; day  = ret[2];
	hour = ret[3]; min  = ret[4]; sec  = ret[5];

	if (error != 0){
		printk(KERN_WARNING "error: reading the clock returned: %s\n", 
				ppc_rtas_process_error(error));
		n = sprintf (buf, "0");
	} else { 
		n = sprintf (buf, "%lu\n", mktime(year, mon, day, hour, min, sec));
	}
	kfree(ret);

	if (*ppos >= strlen(buf))
		return 0;
	if (n > strlen(buf) - *ppos)
		n = strlen(buf) - *ppos;
	if (n > count)
		n = count;
	*ppos += n;
	return n;
}

/* ****************************************************************** */
/* SENSOR STUFF                                                       */
/* ****************************************************************** */
static int ppc_rtas_sensor_read(char * buf, char ** start, off_t off,
		int count, int *eof, void *data)
{
	int i,j,n;
	unsigned long ret;
	int state, error;
	char *buffer;
	int get_sensor_state = rtas_token("get-sensor-state");

	if (count < 0)
		return -EINVAL;

	/* May not be enough */
	buffer = kmalloc(MAX_LINELENGTH*MAX_SENSORS, GFP_KERNEL);

	if (!buffer)
		return -ENOMEM;

	memset(buffer, 0, MAX_LINELENGTH*MAX_SENSORS);

	n  = sprintf ( buffer  , "RTAS (RunTime Abstraction Services) Sensor Information\n");
	n += sprintf ( buffer+n, "Sensor\t\tValue\t\tCondition\tLocation\n");
	n += sprintf ( buffer+n, "********************************************************\n");

	if (ppc_rtas_find_all_sensors() != 0) {