blob: d863e13a50b8a8a7dfb8339e64ad19cc060404ba [file] [log] [blame]
/* ultra45_env.c: Driver for Ultra45 PIC16F747 environmental monitor.
* Copyright (C) 2008 David S. Miller <>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <linux/io.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#define DRV_MODULE_VERSION "0.1"
MODULE_AUTHOR("David S. Miller (");
MODULE_DESCRIPTION("Ultra45 environmental monitor driver");
/* PIC device registers */
#define REG_CMD 0x00UL
#define REG_CMD_RESET 0x80
#define REG_CMD_ESTAR 0x01
#define REG_STAT 0x01UL
#define REG_STAT_FWVER 0xf0
#define REG_STAT_TGOOD 0x08
#define REG_STAT_STALE 0x04
#define REG_STAT_BUSY 0x02
#define REG_STAT_FAULT 0x01
#define REG_DATA 0x40UL
#define REG_ADDR 0x41UL
#define REG_SIZE 0x42UL
/* Registers accessed indirectly via REG_DATA/REG_ADDR */
#define IREG_FAN0 0x00
#define IREG_FAN1 0x01
#define IREG_FAN2 0x02
#define IREG_FAN3 0x03
#define IREG_FAN4 0x04
#define IREG_FAN5 0x05
#define IREG_LCL_TEMP 0x06
#define IREG_RMT1_TEMP 0x07
#define IREG_RMT2_TEMP 0x08
#define IREG_RMT3_TEMP 0x09
#define IREG_LM95221_TEMP 0x0a
#define IREG_FIRE_TEMP 0x0b
#define IREG_LSI1064_TEMP 0x0c
#define IREG_FRONT_TEMP 0x0d
#define IREG_FAN_STAT 0x0e
#define IREG_VCORE0 0x0f
#define IREG_VCORE1 0x10
#define IREG_VMEM0 0x11
#define IREG_VMEM1 0x12
#define IREG_PSU_TEMP 0x13
struct env {
void __iomem *regs;
spinlock_t lock;
struct device *hwmon_dev;
static u8 env_read(struct env *p, u8 ireg)
u8 ret;
writeb(ireg, p->regs + REG_ADDR);
ret = readb(p->regs + REG_DATA);
return ret;
static void env_write(struct env *p, u8 ireg, u8 val)
writeb(ireg, p->regs + REG_ADDR);
writeb(val, p->regs + REG_DATA);
/* There seems to be a adr7462 providing these values, thus a lot
* of these calculations are borrowed from the adt7470 driver.
#define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
#define FAN_PERIOD_INVALID (0xff << 8)
#define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf)
int fan_nr = to_sensor_dev_attr(attr)->index;
struct env *p = dev_get_drvdata(dev);
int rpm, period;
u8 val;
val = env_read(p, IREG_FAN0 + fan_nr);
period = (int) val << 8;
if (FAN_DATA_VALID(period))
rpm = FAN_PERIOD_TO_RPM(period);
rpm = 0;
return sprintf(buf, "%d\n", rpm);
static ssize_t set_fan_speed(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
int fan_nr = to_sensor_dev_attr(attr)->index;
int rpm = simple_strtol(buf, NULL, 10);
struct env *p = dev_get_drvdata(dev);
int period;
u8 val;
if (!rpm)
return -EINVAL;
period = FAN_RPM_TO_PERIOD(rpm);
val = period >> 8;
env_write(p, IREG_FAN0 + fan_nr, val);
return count;
static ssize_t show_fan_fault(struct device *dev, struct device_attribute *attr, char *buf)
int fan_nr = to_sensor_dev_attr(attr)->index;
struct env *p = dev_get_drvdata(dev);
u8 val = env_read(p, IREG_FAN_STAT);
return sprintf(buf, "%d\n", (val & (1 << fan_nr)) ? 1 : 0);
#define fan(index) \
static SENSOR_DEVICE_ATTR(fan##index##_speed, S_IRUGO | S_IWUSR, \
show_fan_speed, set_fan_speed, index); \
static SENSOR_DEVICE_ATTR(fan##index##_fault, S_IRUGO, \
show_fan_fault, NULL, index)
static SENSOR_DEVICE_ATTR(psu_fan_fault, S_IRUGO, show_fan_fault, NULL, 6);
static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf)
int temp_nr = to_sensor_dev_attr(attr)->index;
struct env *p = dev_get_drvdata(dev);
s8 val;
val = env_read(p, IREG_LCL_TEMP + temp_nr);
return sprintf(buf, "%d\n", ((int) val) - 64);
static SENSOR_DEVICE_ATTR(adt7462_local_temp, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(cpu0_temp, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(cpu1_temp, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(motherboard_temp, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(lm95221_local_temp, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(fire_temp, S_IRUGO, show_temp, NULL, 5);
static SENSOR_DEVICE_ATTR(lsi1064_local_temp, S_IRUGO, show_temp, NULL, 6);
static SENSOR_DEVICE_ATTR(front_panel_temp, S_IRUGO, show_temp, NULL, 7);
static SENSOR_DEVICE_ATTR(psu_temp, S_IRUGO, show_temp, NULL, 13);
static ssize_t show_stat_bit(struct device *dev, struct device_attribute *attr, char *buf)
int index = to_sensor_dev_attr(attr)->index;
struct env *p = dev_get_drvdata(dev);
u8 val;
val = readb(p->regs + REG_STAT);
return sprintf(buf, "%d\n", (val & (1 << index)) ? 1 : 0);
static SENSOR_DEVICE_ATTR(fan_failure, S_IRUGO, show_stat_bit, NULL, 0);
static SENSOR_DEVICE_ATTR(env_bus_busy, S_IRUGO, show_stat_bit, NULL, 1);
static SENSOR_DEVICE_ATTR(env_data_stale, S_IRUGO, show_stat_bit, NULL, 2);
static SENSOR_DEVICE_ATTR(tpm_self_test_passed, S_IRUGO, show_stat_bit, NULL, 3);
static ssize_t show_fwver(struct device *dev, struct device_attribute *attr, char *buf)
struct env *p = dev_get_drvdata(dev);
u8 val;
val = readb(p->regs + REG_STAT);
return sprintf(buf, "%d\n", val >> 4);
static SENSOR_DEVICE_ATTR(firmware_version, S_IRUGO, show_fwver, NULL, 0);
static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
return sprintf(buf, "ultra45\n");
static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
static struct attribute *env_attributes[] = {
static const struct attribute_group env_group = {
.attrs = env_attributes,
static int __devinit env_probe(struct platform_device *op,
const struct of_device_id *match)
struct env *p = kzalloc(sizeof(*p), GFP_KERNEL);
int err = -ENOMEM;
if (!p)
goto out;
p->regs = of_ioremap(&op->resource[0], 0, REG_SIZE, "pic16f747");
if (!p->regs)
goto out_free;
err = sysfs_create_group(&op->dev.kobj, &env_group);
if (err)
goto out_iounmap;
p->hwmon_dev = hwmon_device_register(&op->dev);
if (IS_ERR(p->hwmon_dev)) {
err = PTR_ERR(p->hwmon_dev);
goto out_sysfs_remove_group;
dev_set_drvdata(&op->dev, p);
err = 0;
return err;
sysfs_remove_group(&op->dev.kobj, &env_group);
of_iounmap(&op->resource[0], p->regs, REG_SIZE);
goto out;
static int __devexit env_remove(struct platform_device *op)
struct env *p = dev_get_drvdata(&op->dev);
if (p) {
sysfs_remove_group(&op->dev.kobj, &env_group);
of_iounmap(&op->resource[0], p->regs, REG_SIZE);
return 0;
static const struct of_device_id env_match[] = {
.name = "env-monitor",
.compatible = "SUNW,ebus-pic16f747-env",
MODULE_DEVICE_TABLE(of, env_match);
static struct of_platform_driver env_driver = {
.driver = {
.name = "ultra45_env",
.owner = THIS_MODULE,
.of_match_table = env_match,
.probe = env_probe,
.remove = __devexit_p(env_remove),
static int __init env_init(void)
return of_register_platform_driver(&env_driver);
static void __exit env_exit(void)