linux/drivers/hwmon/fscpos.c
Jean Delvare 8a9947552d [PATCH] i2c: Drop i2c_driver.flags, 2 of 3
Just about every i2c chip driver sets the I2C_DF_NOTIFY flag, so we
can simply make it the default and drop the flag. If any driver really
doesn't want to be notified when i2c adapters are added, that driver
can simply omit to set .attach_adapter. This approach is also more
robust as it prevents accidental NULL pointer dereferences.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-01-05 22:16:21 -08:00

649 lines
20 KiB
C

/*
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>
/*
* 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 register);
static int fscpos_write_value(struct i2c_client *client, u8 register, 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 = {
.owner = THIS_MODULE,
.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 semaphore 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;
}
down(&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]);
up(&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;
down(&data->update_lock);
data->pwm[nr - 1] = v;
fscpos_write_value(client, reg, data->pwm[nr - 1]);
up(&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;
down(&data->update_lock);
data->wdog_control &= ~0xf0;
data->wdog_control |= v;
fscpos_write_value(client, reg, data->wdog_control);
up(&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;
}
down(&data->update_lock);
data->wdog_state &= ~v;
fscpos_write_value(client, reg, v);
up(&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;
down(&data->update_lock);
data->wdog_preset = v;
fscpos_write_value(client, reg, data->wdog_preset);
up(&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;
init_MUTEX(&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);
down(&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;
}
up(&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);