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linux_old1/drivers/hwmon/fscpos.c

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/*
fscpos.c - Kernel module for hardware monitoring with FSC Poseidon chips
Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
fujitsu siemens poseidon chip,
module based on the old fscpos module by Hermann Jung <hej@odn.de> and
the fscher module by Reinhard Nissl <rnissl@gmx.de>
original module based on lm80.c
Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
and Philip Edelbrock <phil@netroedge.com>
Thanks to Jean Delvare for reviewing my code and suggesting a lot of
improvements.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
/*
* Addresses to scan
*/
static unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };
/*
* Insmod parameters
*/
I2C_CLIENT_INSMOD_1(fscpos);
/*
* The FSCPOS registers
*/
/* chip identification */
#define FSCPOS_REG_IDENT_0 0x00
#define FSCPOS_REG_IDENT_1 0x01
#define FSCPOS_REG_IDENT_2 0x02
#define FSCPOS_REG_REVISION 0x03
/* global control and status */
#define FSCPOS_REG_EVENT_STATE 0x04
#define FSCPOS_REG_CONTROL 0x05
/* watchdog */
#define FSCPOS_REG_WDOG_PRESET 0x28
#define FSCPOS_REG_WDOG_STATE 0x23
#define FSCPOS_REG_WDOG_CONTROL 0x21
/* voltages */
#define FSCPOS_REG_VOLT_12 0x45
#define FSCPOS_REG_VOLT_5 0x42
#define FSCPOS_REG_VOLT_BATT 0x48
/* fans - the chip does not support minimum speed for fan2 */
static u8 FSCPOS_REG_PWM[] = { 0x55, 0x65 };
static u8 FSCPOS_REG_FAN_ACT[] = { 0x0e, 0x6b, 0xab };
static u8 FSCPOS_REG_FAN_STATE[] = { 0x0d, 0x62, 0xa2 };
static u8 FSCPOS_REG_FAN_RIPPLE[] = { 0x0f, 0x6f, 0xaf };
/* temperatures */
static u8 FSCPOS_REG_TEMP_ACT[] = { 0x64, 0x32, 0x35 };
static u8 FSCPOS_REG_TEMP_STATE[] = { 0x71, 0x81, 0x91 };
/*
* Functions declaration
*/
static int fscpos_attach_adapter(struct i2c_adapter *adapter);
static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind);
static int fscpos_detach_client(struct i2c_client *client);
static int fscpos_read_value(struct i2c_client *client, u8 reg);
static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value);
static struct fscpos_data *fscpos_update_device(struct device *dev);
static void fscpos_init_client(struct i2c_client *client);
static void reset_fan_alarm(struct i2c_client *client, int nr);
/*
* Driver data (common to all clients)
*/
static struct i2c_driver fscpos_driver = {
.driver = {
.name = "fscpos",
},
.id = I2C_DRIVERID_FSCPOS,
.attach_adapter = fscpos_attach_adapter,
.detach_client = fscpos_detach_client,
};
/*
* Client data (each client gets its own)
*/
struct fscpos_data {
struct i2c_client client;
struct class_device *class_dev;
struct mutex update_lock;
char valid; /* 0 until following fields are valid */
unsigned long last_updated; /* In jiffies */
/* register values */
u8 revision; /* revision of chip */
u8 global_event; /* global event status */
u8 global_control; /* global control register */
u8 wdog_control; /* watchdog control */
u8 wdog_state; /* watchdog status */
u8 wdog_preset; /* watchdog preset */
u8 volt[3]; /* 12, 5, battery current */
u8 temp_act[3]; /* temperature */
u8 temp_status[3]; /* status of sensor */
u8 fan_act[3]; /* fans revolutions per second */
u8 fan_status[3]; /* fan status */
u8 pwm[2]; /* fan min value for rps */
u8 fan_ripple[3]; /* divider for rps */
};
/* Temperature */
#define TEMP_FROM_REG(val) (((val) - 128) * 1000)
static ssize_t show_temp_input(struct fscpos_data *data, char *buf, int nr)
{
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_act[nr - 1]));
}
static ssize_t show_temp_status(struct fscpos_data *data, char *buf, int nr)
{
/* bits 2..7 reserved => mask with 0x03 */
return sprintf(buf, "%u\n", data->temp_status[nr - 1] & 0x03);
}
static ssize_t show_temp_reset(struct fscpos_data *data, char *buf, int nr)
{
return sprintf(buf, "1\n");
}
static ssize_t set_temp_reset(struct i2c_client *client, struct fscpos_data
*data, const char *buf, size_t count, int nr, int reg)
{
unsigned long v = simple_strtoul(buf, NULL, 10);
if (v != 1) {
dev_err(&client->dev, "temp_reset value %ld not supported. "
"Use 1 to reset the alarm!\n", v);
return -EINVAL;
}
dev_info(&client->dev, "You used the temp_reset feature which has not "
"been proplerly tested. Please report your "
"experience to the module author.\n");
/* Supported value: 2 (clears the status) */
fscpos_write_value(client, FSCPOS_REG_TEMP_STATE[nr - 1], 2);
return count;
}
/* Fans */
#define RPM_FROM_REG(val) ((val) * 60)
static ssize_t show_fan_status(struct fscpos_data *data, char *buf, int nr)
{
/* bits 0..1, 3..7 reserved => mask with 0x04 */
return sprintf(buf, "%u\n", data->fan_status[nr - 1] & 0x04);
}
static ssize_t show_fan_input(struct fscpos_data *data, char *buf, int nr)
{
return sprintf(buf, "%u\n", RPM_FROM_REG(data->fan_act[nr - 1]));
}
static ssize_t show_fan_ripple(struct fscpos_data *data, char *buf, int nr)
{
/* bits 2..7 reserved => mask with 0x03 */
return sprintf(buf, "%u\n", data->fan_ripple[nr - 1] & 0x03);
}
static ssize_t set_fan_ripple(struct i2c_client *client, struct fscpos_data
*data, const char *buf, size_t count, int nr, int reg)
{
/* supported values: 2, 4, 8 */
unsigned long v = simple_strtoul(buf, NULL, 10);
switch (v) {
case 2: v = 1; break;
case 4: v = 2; break;
case 8: v = 3; break;
default:
dev_err(&client->dev, "fan_ripple value %ld not supported. "
"Must be one of 2, 4 or 8!\n", v);
return -EINVAL;
}
mutex_lock(&data->update_lock);
/* bits 2..7 reserved => mask with 0x03 */
data->fan_ripple[nr - 1] &= ~0x03;
data->fan_ripple[nr - 1] |= v;
fscpos_write_value(client, reg, data->fan_ripple[nr - 1]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_pwm(struct fscpos_data *data, char *buf, int nr)
{
return sprintf(buf, "%u\n", data->pwm[nr - 1]);
}
static ssize_t set_pwm(struct i2c_client *client, struct fscpos_data *data,
const char *buf, size_t count, int nr, int reg)
{
unsigned long v = simple_strtoul(buf, NULL, 10);
/* Range: 0..255 */
if (v < 0) v = 0;
if (v > 255) v = 255;
mutex_lock(&data->update_lock);
data->pwm[nr - 1] = v;
fscpos_write_value(client, reg, data->pwm[nr - 1]);
mutex_unlock(&data->update_lock);
return count;
}
static void reset_fan_alarm(struct i2c_client *client, int nr)
{
fscpos_write_value(client, FSCPOS_REG_FAN_STATE[nr], 4);
}
/* Volts */
#define VOLT_FROM_REG(val, mult) ((val) * (mult) / 255)
static ssize_t show_volt_12(struct device *dev, struct device_attribute *attr, char *buf)
{
struct fscpos_data *data = fscpos_update_device(dev);
return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[0], 14200));
}
static ssize_t show_volt_5(struct device *dev, struct device_attribute *attr, char *buf)
{
struct fscpos_data *data = fscpos_update_device(dev);
return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[1], 6600));
}
static ssize_t show_volt_batt(struct device *dev, struct device_attribute *attr, char *buf)
{
struct fscpos_data *data = fscpos_update_device(dev);
return sprintf(buf, "%u\n", VOLT_FROM_REG(data->volt[2], 3300));
}
/* Watchdog */
static ssize_t show_wdog_control(struct fscpos_data *data, char *buf)
{
/* bits 0..3 reserved, bit 6 write only => mask with 0xb0 */
return sprintf(buf, "%u\n", data->wdog_control & 0xb0);
}
static ssize_t set_wdog_control(struct i2c_client *client, struct fscpos_data
*data, const char *buf, size_t count, int reg)
{
/* bits 0..3 reserved => mask with 0xf0 */
unsigned long v = simple_strtoul(buf, NULL, 10) & 0xf0;
mutex_lock(&data->update_lock);
data->wdog_control &= ~0xf0;
data->wdog_control |= v;
fscpos_write_value(client, reg, data->wdog_control);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_wdog_state(struct fscpos_data *data, char *buf)
{
/* bits 0, 2..7 reserved => mask with 0x02 */
return sprintf(buf, "%u\n", data->wdog_state & 0x02);
}
static ssize_t set_wdog_state(struct i2c_client *client, struct fscpos_data
*data, const char *buf, size_t count, int reg)
{
unsigned long v = simple_strtoul(buf, NULL, 10) & 0x02;
/* Valid values: 2 (clear) */
if (v != 2) {
dev_err(&client->dev, "wdog_state value %ld not supported. "
"Must be 2 to clear the state!\n", v);
return -EINVAL;
}
mutex_lock(&data->update_lock);
data->wdog_state &= ~v;
fscpos_write_value(client, reg, v);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_wdog_preset(struct fscpos_data *data, char *buf)
{
return sprintf(buf, "%u\n", data->wdog_preset);
}
static ssize_t set_wdog_preset(struct i2c_client *client, struct fscpos_data
*data, const char *buf, size_t count, int reg)
{
unsigned long v = simple_strtoul(buf, NULL, 10) & 0xff;
mutex_lock(&data->update_lock);
data->wdog_preset = v;
fscpos_write_value(client, reg, data->wdog_preset);
mutex_unlock(&data->update_lock);
return count;
}
/* Event */
static ssize_t show_event(struct device *dev, struct device_attribute *attr, char *buf)
{
/* bits 5..7 reserved => mask with 0x1f */
struct fscpos_data *data = fscpos_update_device(dev);
return sprintf(buf, "%u\n", data->global_event & 0x9b);
}
/*
* Sysfs stuff
*/
#define create_getter(kind, sub) \
static ssize_t sysfs_show_##kind##sub(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct fscpos_data *data = fscpos_update_device(dev); \
return show_##kind##sub(data, buf); \
}
#define create_getter_n(kind, offset, sub) \
static ssize_t sysfs_show_##kind##offset##sub(struct device *dev, struct device_attribute *attr, char\
*buf) \
{ \
struct fscpos_data *data = fscpos_update_device(dev); \
return show_##kind##sub(data, buf, offset); \
}
#define create_setter(kind, sub, reg) \
static ssize_t sysfs_set_##kind##sub (struct device *dev, struct device_attribute *attr, const char \
*buf, size_t count) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct fscpos_data *data = i2c_get_clientdata(client); \
return set_##kind##sub(client, data, buf, count, reg); \
}
#define create_setter_n(kind, offset, sub, reg) \
static ssize_t sysfs_set_##kind##offset##sub (struct device *dev, struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct fscpos_data *data = i2c_get_clientdata(client); \
return set_##kind##sub(client, data, buf, count, offset, reg);\
}
#define create_sysfs_device_ro(kind, sub, offset) \
static DEVICE_ATTR(kind##offset##sub, S_IRUGO, \
sysfs_show_##kind##offset##sub, NULL);
#define create_sysfs_device_rw(kind, sub, offset) \
static DEVICE_ATTR(kind##offset##sub, S_IRUGO | S_IWUSR, \
sysfs_show_##kind##offset##sub, sysfs_set_##kind##offset##sub);
#define sysfs_ro_n(kind, sub, offset) \
create_getter_n(kind, offset, sub); \
create_sysfs_device_ro(kind, sub, offset);
#define sysfs_rw_n(kind, sub, offset, reg) \
create_getter_n(kind, offset, sub); \
create_setter_n(kind, offset, sub, reg); \
create_sysfs_device_rw(kind, sub, offset);
#define sysfs_rw(kind, sub, reg) \
create_getter(kind, sub); \
create_setter(kind, sub, reg); \
create_sysfs_device_rw(kind, sub,);
#define sysfs_fan_with_min(offset, reg_status, reg_ripple, reg_min) \
sysfs_fan(offset, reg_status, reg_ripple); \
sysfs_rw_n(pwm,, offset, reg_min);
#define sysfs_fan(offset, reg_status, reg_ripple) \
sysfs_ro_n(fan, _input, offset); \
sysfs_ro_n(fan, _status, offset); \
sysfs_rw_n(fan, _ripple, offset, reg_ripple);
#define sysfs_temp(offset, reg_status) \
sysfs_ro_n(temp, _input, offset); \
sysfs_ro_n(temp, _status, offset); \
sysfs_rw_n(temp, _reset, offset, reg_status);
#define sysfs_watchdog(reg_wdog_preset, reg_wdog_state, reg_wdog_control) \
sysfs_rw(wdog, _control, reg_wdog_control); \
sysfs_rw(wdog, _preset, reg_wdog_preset); \
sysfs_rw(wdog, _state, reg_wdog_state);
sysfs_fan_with_min(1, FSCPOS_REG_FAN_STATE[0], FSCPOS_REG_FAN_RIPPLE[0],
FSCPOS_REG_PWM[0]);
sysfs_fan_with_min(2, FSCPOS_REG_FAN_STATE[1], FSCPOS_REG_FAN_RIPPLE[1],
FSCPOS_REG_PWM[1]);
sysfs_fan(3, FSCPOS_REG_FAN_STATE[2], FSCPOS_REG_FAN_RIPPLE[2]);
sysfs_temp(1, FSCPOS_REG_TEMP_STATE[0]);
sysfs_temp(2, FSCPOS_REG_TEMP_STATE[1]);
sysfs_temp(3, FSCPOS_REG_TEMP_STATE[2]);
sysfs_watchdog(FSCPOS_REG_WDOG_PRESET, FSCPOS_REG_WDOG_STATE,
FSCPOS_REG_WDOG_CONTROL);
static DEVICE_ATTR(event, S_IRUGO, show_event, NULL);
static DEVICE_ATTR(in0_input, S_IRUGO, show_volt_12, NULL);
static DEVICE_ATTR(in1_input, S_IRUGO, show_volt_5, NULL);
static DEVICE_ATTR(in2_input, S_IRUGO, show_volt_batt, NULL);
static int fscpos_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, fscpos_detect);
}
static int fscpos_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct fscpos_data *data;
int err = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto exit;
/*
* OK. For now, we presume we have a valid client. We now create the
* client structure, even though we cannot fill it completely yet.
* But it allows us to access fscpos_{read,write}_value.
*/
if (!(data = kzalloc(sizeof(struct fscpos_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
new_client = &data->client;
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &fscpos_driver;
new_client->flags = 0;
/* Do the remaining detection unless force or force_fscpos parameter */
if (kind < 0) {
if ((fscpos_read_value(new_client, FSCPOS_REG_IDENT_0)
!= 0x50) /* 'P' */
|| (fscpos_read_value(new_client, FSCPOS_REG_IDENT_1)
!= 0x45) /* 'E' */
|| (fscpos_read_value(new_client, FSCPOS_REG_IDENT_2)
!= 0x47))/* 'G' */
{
dev_dbg(&new_client->dev, "fscpos detection failed\n");
goto exit_free;
}
}
/* Fill in the remaining client fields and put it in the global list */
strlcpy(new_client->name, "fscpos", I2C_NAME_SIZE);
data->valid = 0;
mutex_init(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto exit_free;
/* Inizialize the fscpos chip */
fscpos_init_client(new_client);
/* Announce that the chip was found */
dev_info(&new_client->dev, "Found fscpos chip, rev %u\n", data->revision);
/* Register sysfs hooks */
data->class_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->class_dev)) {
err = PTR_ERR(data->class_dev);
goto exit_detach;
}
device_create_file(&new_client->dev, &dev_attr_event);
device_create_file(&new_client->dev, &dev_attr_in0_input);
device_create_file(&new_client->dev, &dev_attr_in1_input);
device_create_file(&new_client->dev, &dev_attr_in2_input);
device_create_file(&new_client->dev, &dev_attr_wdog_control);
device_create_file(&new_client->dev, &dev_attr_wdog_preset);
device_create_file(&new_client->dev, &dev_attr_wdog_state);
device_create_file(&new_client->dev, &dev_attr_temp1_input);
device_create_file(&new_client->dev, &dev_attr_temp1_status);
device_create_file(&new_client->dev, &dev_attr_temp1_reset);
device_create_file(&new_client->dev, &dev_attr_temp2_input);
device_create_file(&new_client->dev, &dev_attr_temp2_status);
device_create_file(&new_client->dev, &dev_attr_temp2_reset);
device_create_file(&new_client->dev, &dev_attr_temp3_input);
device_create_file(&new_client->dev, &dev_attr_temp3_status);
device_create_file(&new_client->dev, &dev_attr_temp3_reset);
device_create_file(&new_client->dev, &dev_attr_fan1_input);
device_create_file(&new_client->dev, &dev_attr_fan1_status);
device_create_file(&new_client->dev, &dev_attr_fan1_ripple);
device_create_file(&new_client->dev, &dev_attr_pwm1);
device_create_file(&new_client->dev, &dev_attr_fan2_input);
device_create_file(&new_client->dev, &dev_attr_fan2_status);
device_create_file(&new_client->dev, &dev_attr_fan2_ripple);
device_create_file(&new_client->dev, &dev_attr_pwm2);
device_create_file(&new_client->dev, &dev_attr_fan3_input);
device_create_file(&new_client->dev, &dev_attr_fan3_status);
device_create_file(&new_client->dev, &dev_attr_fan3_ripple);
return 0;
exit_detach:
i2c_detach_client(new_client);
exit_free:
kfree(data);
exit:
return err;
}
static int fscpos_detach_client(struct i2c_client *client)
{
struct fscpos_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->class_dev);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;
}
static int fscpos_read_value(struct i2c_client *client, u8 reg)
{
dev_dbg(&client->dev, "Read reg 0x%02x\n", reg);
return i2c_smbus_read_byte_data(client, reg);
}
static int fscpos_write_value(struct i2c_client *client, u8 reg, u8 value)
{
dev_dbg(&client->dev, "Write reg 0x%02x, val 0x%02x\n", reg, value);
return i2c_smbus_write_byte_data(client, reg, value);
}
/* Called when we have found a new FSCPOS chip */
static void fscpos_init_client(struct i2c_client *client)
{
struct fscpos_data *data = i2c_get_clientdata(client);
/* read revision from chip */
data->revision = fscpos_read_value(client, FSCPOS_REG_REVISION);
}
static struct fscpos_data *fscpos_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct fscpos_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
int i;
dev_dbg(&client->dev, "Starting fscpos update\n");
for (i = 0; i < 3; i++) {
data->temp_act[i] = fscpos_read_value(client,
FSCPOS_REG_TEMP_ACT[i]);
data->temp_status[i] = fscpos_read_value(client,
FSCPOS_REG_TEMP_STATE[i]);
data->fan_act[i] = fscpos_read_value(client,
FSCPOS_REG_FAN_ACT[i]);
data->fan_status[i] = fscpos_read_value(client,
FSCPOS_REG_FAN_STATE[i]);
data->fan_ripple[i] = fscpos_read_value(client,
FSCPOS_REG_FAN_RIPPLE[i]);
if (i < 2) {
/* fan2_min is not supported by the chip */
data->pwm[i] = fscpos_read_value(client,
FSCPOS_REG_PWM[i]);
}
/* reset fan status if speed is back to > 0 */
if (data->fan_status[i] != 0 && data->fan_act[i] > 0) {
reset_fan_alarm(client, i);
}
}
data->volt[0] = fscpos_read_value(client, FSCPOS_REG_VOLT_12);
data->volt[1] = fscpos_read_value(client, FSCPOS_REG_VOLT_5);
data->volt[2] = fscpos_read_value(client, FSCPOS_REG_VOLT_BATT);
data->wdog_preset = fscpos_read_value(client,
FSCPOS_REG_WDOG_PRESET);
data->wdog_state = fscpos_read_value(client,
FSCPOS_REG_WDOG_STATE);
data->wdog_control = fscpos_read_value(client,
FSCPOS_REG_WDOG_CONTROL);
data->global_event = fscpos_read_value(client,
FSCPOS_REG_EVENT_STATE);
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static int __init sm_fscpos_init(void)
{
return i2c_add_driver(&fscpos_driver);
}
static void __exit sm_fscpos_exit(void)
{
i2c_del_driver(&fscpos_driver);
}
MODULE_AUTHOR("Stefan Ott <stefan@desire.ch> based on work from Hermann Jung "
"<hej@odn.de>, Frodo Looijaard <frodol@dds.nl>"
" and Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("fujitsu siemens poseidon chip driver");
MODULE_LICENSE("GPL");
module_init(sm_fscpos_init);
module_exit(sm_fscpos_exit);
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