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/*
* BK Id: SCCS/s.proc_rtas.c 1.5 05/17/01 18:14:22 cort
*/
/*
* arch/ppc/kernel/proc_rtas.c
* Copyright (C) 2000 Tilmann Bitterberg
* (tilmann@bitterberg.de)
*
* 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/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;
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 = find_devices("rtas");
if ((rtas == 0) || (_machine != _MACH_chrp)) {
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 = call_rtas("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 = call_rtas("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 = call_rtas("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[MAX_LINELENGTH*MAX_SENSORS]; /* May not be enough */
if (count < 0)
return -EINVAL;
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) {
n += sprintf ( buffer+n, "\nNo sensors are available\n");
goto return_string;
}
for (i=0; i<sensors.quant; i++) {
j = sensors.sensor[i].quant;
/* A sensor may have multiple instances */
while (j >= 0) {
error = call_rtas("get-sensor-state", 2, 2, &ret,
sensors.sensor[i].token, sensors.sensor[i].quant-j);
state = (int) ret;
n += ppc_rtas_process_sensor(sensors.sensor[i], state, error, buffer+n );
n += sprintf (buffer+n, "\n");
j--;
} /* while */
} /* for */
return_string:
if (off >= strlen(buffer)) {
*eof = 1;
return 0;
}
if (n > strlen(buffer) - off)
n = strlen(buffer) - off;
if (n > count)
n = count;
else
*eof = 1;
memcpy(buf, buffer + off, n);
*start = buf;
return n;
}
/* ****************************************************************** */
int ppc_rtas_find_all_sensors (void)
{
unsigned long *utmp;
int len, i, j;
utmp = (unsigned long *) get_property(rtas, "rtas-sensors", &len);
if (utmp == NULL) {
printk (KERN_ERR "error: could not get rtas-sensors\n");
return 1;
}
sensors.quant = len / 8; /* int + int */
for (i=0, j=0; j<sensors.quant; i+=2, j++) {
sensors.sensor[j].token = utmp[i];
sensors.sensor[j].quant = utmp[i+1];
}
return 0;
}
/* ****************************************************************** */
/*
* Builds a string of what rtas returned
*/
char * ppc_rtas_process_error(int error)
{
switch (error) {
case SENSOR_CRITICAL_HIGH:
return "(critical high)";
case SENSOR_WARNING_HIGH:
return "(warning high)";
case SENSOR_NORMAL:
return "(normal)";
case SENSOR_WARNING_LOW:
return "(warning low)";
case SENSOR_CRITICAL_LOW:
return "(critical low)";
case SENSOR_SUCCESS:
return "(read ok)";
case SENSOR_HW_ERROR:
return "(hardware error)";
case SENSOR_BUSY:
return "(busy)";
case SENSOR_NOT_EXIST:
return "(non existant)";
case SENSOR_DR_ENTITY:
return "(dr entity removed)";
default:
return "(UNKNOWN)";
}
}
/* ****************************************************************** */
/*
* Builds a string out of what the sensor said
*/
int ppc_rtas_process_sensor(struct individual_sensor s, int state,
int error, char * buf)
{
/* Defined return vales */
const char * key_switch[] = { "Off\t", "Normal\t", "Secure\t", "Mainenance" };
const char * enclosure_switch[] = { "Closed", "Open" };
const char * lid_status[] = { " ", "Open", "Closed" };
const char * power_source[] = { "AC\t", "Battery", "AC & Battery" };
const char * battery_remaining[] = { "Very Low", "Low", "Mid", "High" };
const char * epow_sensor[] = {
"EPOW Reset", "Cooling warning", "Power warning",
"System shutdown", "System halt", "EPOW main enclosure",
"EPOW power off" };
const char * battery_cyclestate[] = { "None", "In progress", "Requested" };
const char * battery_charging[] = { "Charging", "Discharching", "No current flow" };
const char * ibm_drconnector[] = { "Empty", "Present" };
const char * ibm_intqueue[] = { "Disabled", "Enabled" };
int have_strings = 0;
int temperature = 0;
int unknown = 0;
int n = 0;
/* What kind of sensor do we have here? */
switch (s.token) {
case KEY_SWITCH:
n += sprintf(buf+n, "Key switch:\t");
n += sprintf(buf+n, "%s\t", key_switch[state]);
have_strings = 1;
break;
case ENCLOSURE_SWITCH:
n += sprintf(buf+n, "Enclosure switch:\t");
n += sprintf(buf+n, "%s\t", enclosure_switch[state]);
have_strings = 1;
break;
case THERMAL_SENSOR:
n += sprintf(buf+n, "Temp. (°C/°F):\t");
temperature = 1;
break;
case LID_STATUS:
n += sprintf(buf+n, "Lid status:\t");
n += sprintf(buf+n, "%s\t", lid_status[state]);
have_strings = 1;
break;
case POWER_SOURCE:
n += sprintf(buf+n, "Power source:\t");
n += sprintf(buf+n, "%s\t", power_source[state]);
have_strings = 1;
break;
case BATTERY_VOLTAGE:
n += sprintf(buf+n, "Battery voltage:\t");
break;
case BATTERY_REMAINING:
n += sprintf(buf+n, "Battery remaining:\t");
n += sprintf(buf+n, "%s\t", battery_remaining[state]);
have_strings = 1;
break;
case BATTERY_PERCENTAGE:
n += sprintf(buf+n, "Battery percentage:\t");
break;
case EPOW_SENSOR:
n += sprintf(buf+n, "EPOW Sensor:\t");
n += sprintf(buf+n, "%s\t", epow_sensor[state]);
have_strings = 1;
break;
case BATTERY_CYCLESTATE:
n += sprintf(buf+n, "Battery cyclestate:\t");
n += sprintf(buf+n, "%s\t", battery_cyclestate[state]);
have_strings = 1;
break;
case BATTERY_CHARGING:
n += sprintf(buf+n, "Battery Charging:\t");
n += sprintf(buf+n, "%s\t", battery_charging[state]);
have_strings = 1;
break;
case IBM_SURVEILLANCE:
n += sprintf(buf+n, "Surveillance:\t");
break;
case IBM_FANRPM:
n += sprintf(buf+n, "Fan (rpm):\t");
break;
case IBM_VOLTAGE:
n += sprintf(buf+n, "Voltage (mv):\t");
break;
case IBM_DRCONNECTOR:
n += sprintf(buf+n, "DR connector:\t");
n += sprintf(buf+n, "%s\t", ibm_drconnector[state]);
have_strings = 1;
break;
case IBM_POWERSUPPLY:
n += sprintf(buf+n, "Powersupply:\t");
break;
case IBM_INTQUEUE:
n += sprintf(buf+n, "Interrupt queue:\t");
n += sprintf(buf+n, "%s\t", ibm_intqueue[state]);
have_strings = 1;
break;
default:
n += sprintf(buf+n, "Unkown sensor (type %d), ignoring it\n",
s.token);
unknown = 1;
have_strings = 1;
break;
}
if (have_strings == 0) {
if (temperature) {
n += sprintf(buf+n, "%4d /%4d\t", state, cel_to_fahr(state));
} else
n += sprintf(buf+n, "%10d\t", state);
}
if (unknown == 0) {
n += sprintf ( buf+n, "%s\t", ppc_rtas_process_error(error));
n += get_location_code(s, buf+n);
}
return n;
}
/* ****************************************************************** */
int check_location (char *c, int idx, char * buf)
{
int n = 0;
switch (*(c+idx)) {
case LOC_PLANAR:
n += sprintf ( buf, "Planar #%c", *(c+idx+1));
break;
case LOC_CPU:
n += sprintf ( buf, "CPU #%c", *(c+idx+1));
break;
case LOC_FAN:
n += sprintf ( buf, "Fan #%c", *(c+idx+1));
break;
case LOC_RACKMOUNTED:
n += sprintf ( buf, "Rack #%c", *(c+idx+1));
break;
case LOC_VOLTAGE:
n += sprintf ( buf, "Voltage #%c", *(c+idx+1));
break;
case LOC_LCD:
n += sprintf ( buf, "LCD #%c", *(c+idx+1));
break;
case '.':
n += sprintf ( buf, "- %c", *(c+idx+1));
default:
n += sprintf ( buf, "Unknown location");
break;
}
return n;
}
/* ****************************************************************** */
/*
* Format:
* ${LETTER}${NUMBER}[[-/]${LETTER}${NUMBER} [ ... ] ]
* the '.' may be an abbrevation
*/
int check_location_string (char *c, char *buf)
{
int n=0,i=0;
while (c[i]) {
if (isalpha(c[i]) || c[i] == '.') {
n += check_location(c, i, buf+n);
}
else if (c[i] == '/' || c[i] == '-')
n += sprintf(buf+n, " at ");
i++;
}
return n;
}
/* ****************************************************************** */
int get_location_code(struct individual_sensor s, char * buffer)
{
char rstr[512], tmp[10], tmp2[10];
int n=0, i=0, llen, len;
/* char *buf = kmalloc(MAX_LINELENGTH, GFP_KERNEL); */
char *ret;
static int pos = 0; /* remember position where buffer was */
/* construct the sensor number like 0003 */
/* fill with zeros */
n = sprintf(tmp, "%d", s.token);
len = strlen(tmp);
while (strlen(tmp) < 4)
n += sprintf (tmp+n, "0");
/* invert the string */
while (tmp[i]) {
if (i<len)
tmp2[4-len+i] = tmp[i];
else
tmp2[3-i] = tmp[i];
i++;
}
tmp2[4] = '\0';
sprintf (rstr, SENSOR_PREFIX"%s", tmp2);
ret = (char *) get_property(rtas, rstr, &llen);
n=0;
if (ret[0] == '\0')
n += sprintf ( buffer+n, "--- ");/* does not have a location */
else {
char t[50];
ret += pos;
n += check_location_string(ret, buffer + n);
n += sprintf ( buffer+n, " ");
/* see how many characters we have printed */
sprintf ( t, "%s ", ret);
pos += strlen(t);
if (pos >= llen) pos=0;
}
return n;
}
/* ****************************************************************** */
/* INDICATORS - Tone Frequency */
/* ****************************************************************** */
static ssize_t ppc_rtas_tone_freq_write(struct file * file, const char * buf,
size_t count, loff_t *ppos)
{
unsigned long freq;
char *dest;
int error;
freq = simple_strtoul(buf, &dest, 10);
if (*dest != '\0' && *dest != '\n') {
printk("ppc_rtas_tone_freq_write: Invalid tone freqency\n");
return count;
}
if (freq < 0) freq = 0;
rtas_tone_frequency = freq; /* save it for later */
error = call_rtas("set-indicator", 3, 1, NULL,
TONE_FREQUENCY, 0, freq);
if (error != 0)
printk(KERN_WARNING "error: setting tone frequency returned: %s\n",
ppc_rtas_process_error(error));
return count;
}
/* ****************************************************************** */
static ssize_t ppc_rtas_tone_freq_read(struct file * file, char * buf,
size_t count, loff_t *ppos)
{
int n;
n = sprintf(buf, "%lu\n", rtas_tone_frequency);
if (*ppos >= strlen(buf))
return 0;
if (n > strlen(buf) - *ppos)
n = strlen(buf) - *ppos;
if (n > count)
n = count;
*ppos += n;
return n;
}
/* ****************************************************************** */
/* INDICATORS - Tone Volume */
/* ****************************************************************** */
static ssize_t ppc_rtas_tone_volume_write(struct file * file, const char * buf,
size_t count, loff_t *ppos)
{
unsigned long volume;
char *dest;
int error;
volume = simple_strtoul(buf, &dest, 10);
if (*dest != '\0' && *dest != '\n') {
printk("ppc_rtas_tone_volume_write: Invalid tone volume\n");
return count;
}
if (volume < 0) volume = 0;
if (volume > 100) volume = 100;
rtas_tone_volume = volume; /* save it for later */
error = call_rtas("set-indicator", 3, 1, NULL,
TONE_VOLUME, 0, volume);
if (error != 0)
printk(KERN_WARNING "error: setting tone volume returned: %s\n",
ppc_rtas_process_error(error));
return count;
}
/* ****************************************************************** */
static ssize_t ppc_rtas_tone_volume_read(struct file * file, char * buf,
size_t count, loff_t *ppos)
{
int n;
n = sprintf(buf, "%lu\n", rtas_tone_volume);
if (*ppos >= strlen(buf))
return 0;
if (n > strlen(buf) - *ppos)
n = strlen(buf) - *ppos;
if (n > count)
n = count;
*ppos += n;
return n;
}
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