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linux/drivers/hwmon/vt8231.c
Saheed O. Bolarinwa 2207515db6 hwmon: (i5k_amb, vt8231) Drop uses of pci_read_config_*() return value 
The return value of pci_read_config_*() may not indicate a device error.
However, the value read by these functions is more likely to indicate
this kind of error. This presents two overlapping ways of reporting
errors and complicates error checking.

It is possible to move to one single way of checking for error if the
dependency on the return value of these functions is removed, then it
can later be made to return void.

Remove all uses of the return value of pci_read_config_*().
Check the actual value read for ~0. In this case, ~0 is an invalid
value thus it indicates some kind of error.

Suggested-by: Bjorn Helgaas <bjorn@helgaas.com>
Signed-off-by: Saheed O. Bolarinwa <refactormyself@gmail.com>
Link: https://lore.kernel.org/r/20200801112446.149549-11-refactormyself@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-08-04 14:24:39 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* vt8231.c - Part of lm_sensors, Linux kernel modules
* for hardware monitoring
*
* Copyright (c) 2005 Roger Lucas <vt8231@hiddenengine.co.uk>
* Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
* Aaron M. Marsh <amarsh@sdf.lonestar.org>
*/
/*
* Supports VIA VT8231 South Bridge embedded sensors
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/io.h>
static int force_addr;
module_param(force_addr, int, 0);
MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
static struct platform_device *pdev;
#define VT8231_EXTENT 0x80
#define VT8231_BASE_REG 0x70
#define VT8231_ENABLE_REG 0x74
/*
* The VT8231 registers
*
* The reset value for the input channel configuration is used (Reg 0x4A=0x07)
* which sets the selected inputs marked with '*' below if multiple options are
* possible:
*
* Voltage Mode Temperature Mode
* Sensor Linux Id Linux Id VIA Id
* -------- -------- -------- ------
* CPU Diode N/A temp1 0
* UIC1 in0 temp2 * 1
* UIC2 in1 * temp3 2
* UIC3 in2 * temp4 3
* UIC4 in3 * temp5 4
* UIC5 in4 * temp6 5
* 3.3V in5 N/A
*
* Note that the BIOS may set the configuration register to a different value
* to match the motherboard configuration.
*/
/* fans numbered 0-1 */
#define VT8231_REG_FAN_MIN(nr) (0x3b + (nr))
#define VT8231_REG_FAN(nr) (0x29 + (nr))
/* Voltage inputs numbered 0-5 */
static const u8 regvolt[] = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
/*
* Temperatures are numbered 1-6 according to the Linux kernel specification.
*
* In the VIA datasheet, however, the temperatures are numbered from zero.
* Since it is important that this driver can easily be compared to the VIA
* datasheet, we will use the VIA numbering within this driver and map the
* kernel sysfs device name to the VIA number in the sysfs callback.
*/
#define VT8231_REG_TEMP_LOW01 0x49
#define VT8231_REG_TEMP_LOW25 0x4d
static const u8 regtemp[] = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
#define TEMP_FROM_REG(reg) (((253 * 4 - (reg)) * 550 + 105) / 210)
#define TEMP_MAXMIN_FROM_REG(reg) (((253 - (reg)) * 2200 + 105) / 210)
#define TEMP_MAXMIN_TO_REG(val) (253 - ((val) * 210 + 1100) / 2200)
#define VT8231_REG_CONFIG 0x40
#define VT8231_REG_ALARM1 0x41
#define VT8231_REG_ALARM2 0x42
#define VT8231_REG_FANDIV 0x47
#define VT8231_REG_UCH_CONFIG 0x4a
#define VT8231_REG_TEMP1_CONFIG 0x4b
#define VT8231_REG_TEMP2_CONFIG 0x4c
/*
* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
* numbering
*/
#define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
((ch_config) >> ((i)+1)) & 0x01)
/* voltages 0-5 */
#define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
!(((ch_config) >> ((i)+2)) & 0x01))
#define DIV_FROM_REG(val) (1 << (val))
/*
* NB The values returned here are NOT temperatures. The calibration curves
* for the thermistor curves are board-specific and must go in the
* sensors.conf file. Temperature sensors are actually ten bits, but the
* VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
* register. The temperature value returned should have a magnitude of 3,
* so we use the VIA scaling as the "true" scaling and use the remaining 2
* LSBs as fractional precision.
*
* All the on-chip hardware temperature comparisons for the alarms are only
* 8-bits wide, and compare against the 8 MSBs of the temperature. The bits
* in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
* ignored.
*/
/*
****** FAN RPM CONVERSIONS ********
* This chip saturates back at 0, not at 255 like many the other chips.
* So, 0 means 0 RPM
*/
static inline u8 FAN_TO_REG(long rpm, int div)
{
if (rpm <= 0 || rpm > 1310720)
return 0;
return clamp_val(1310720 / (rpm * div), 1, 255);
}
#define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
struct vt8231_data {
unsigned short addr;
const char *name;
struct mutex update_lock;
struct device *hwmon_dev;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u8 in[6]; /* Register value */
u8 in_max[6]; /* Register value */
u8 in_min[6]; /* Register value */
u16 temp[6]; /* Register value 10 bit, right aligned */
u8 temp_max[6]; /* Register value */
u8 temp_min[6]; /* Register value */
u8 fan[2]; /* Register value */
u8 fan_min[2]; /* Register value */
u8 fan_div[2]; /* Register encoding, shifted right */
u16 alarms; /* Register encoding */
u8 uch_config;
};
static struct pci_dev *s_bridge;
static int vt8231_probe(struct platform_device *pdev);
static int vt8231_remove(struct platform_device *pdev);
static struct vt8231_data *vt8231_update_device(struct device *dev);
static void vt8231_init_device(struct vt8231_data *data);
static inline int vt8231_read_value(struct vt8231_data *data, u8 reg)
{
return inb_p(data->addr + reg);
}
static inline void vt8231_write_value(struct vt8231_data *data, u8 reg,
u8 value)
{
outb_p(value, data->addr + reg);
}
/* following are the sysfs callback functions */
static ssize_t in_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
}
static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
}
static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
}
static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_min[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
vt8231_write_value(data, regvoltmin[nr], data->in_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_max[nr] = clamp_val(((val * 958) / 10000) + 3, 0, 255);
vt8231_write_value(data, regvoltmax[nr], data->in_max[nr]);
mutex_unlock(&data->update_lock);
return count;
}
/* Special case for input 5 as this has 3.3V scaling built into the chip */
static ssize_t in5_input_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n",
(((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
}
static ssize_t in5_min_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n",
(((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
}
static ssize_t in5_max_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n",
(((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
}
static ssize_t in5_min_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct vt8231_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_min[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
0, 255);
vt8231_write_value(data, regvoltmin[5], data->in_min[5]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t in5_max_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct vt8231_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_max[5] = clamp_val(((val * 958 * 34) / (10000 * 54)) + 3,
0, 255);
vt8231_write_value(data, regvoltmax[5], data->in_max[5]);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
static DEVICE_ATTR_RO(in5_input);
static DEVICE_ATTR_RW(in5_min);
static DEVICE_ATTR_RW(in5_max);
/* Temperatures */
static ssize_t temp1_input_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", data->temp[0] * 250);
}
static ssize_t temp1_max_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
}
static ssize_t temp1_max_hyst_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
}
static ssize_t temp1_max_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct vt8231_data *data = dev_get_drvdata(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_max[0] = clamp_val((val + 500) / 1000, 0, 255);
vt8231_write_value(data, regtempmax[0], data->temp_max[0]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t temp1_max_hyst_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct vt8231_data *data = dev_get_drvdata(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_min[0] = clamp_val((val + 500) / 1000, 0, 255);
vt8231_write_value(data, regtempmin[0], data->temp_min[0]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
}
static ssize_t temp_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
}
static ssize_t temp_min_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
}
static ssize_t temp_max_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = dev_get_drvdata(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_max[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
vt8231_write_value(data, regtempmax[nr], data->temp_max[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t temp_min_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = dev_get_drvdata(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_min[nr] = clamp_val(TEMP_MAXMIN_TO_REG(val), 0, 255);
vt8231_write_value(data, regtempmin[nr], data->temp_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
/*
* Note that these map the Linux temperature sensor numbering (1-6) to the VIA
* temperature sensor numbering (0-5)
*/
static DEVICE_ATTR_RO(temp1_input);
static DEVICE_ATTR_RW(temp1_max);
static DEVICE_ATTR_RW(temp1_max_hyst);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, temp_min, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, temp_min, 2);
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
static SENSOR_DEVICE_ATTR_RW(temp4_max, temp_max, 3);
static SENSOR_DEVICE_ATTR_RW(temp4_max_hyst, temp_min, 3);
static SENSOR_DEVICE_ATTR_RO(temp5_input, temp, 4);
static SENSOR_DEVICE_ATTR_RW(temp5_max, temp_max, 4);
static SENSOR_DEVICE_ATTR_RW(temp5_max_hyst, temp_min, 4);
static SENSOR_DEVICE_ATTR_RO(temp6_input, temp, 5);
static SENSOR_DEVICE_ATTR_RW(temp6_max, temp_max, 5);
static SENSOR_DEVICE_ATTR_RW(temp6_max_hyst, temp_min, 5);
/* Fans */
static ssize_t fan_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
}
static ssize_t fan_min_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
int nr = sensor_attr->index;
struct vt8231_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t fan_div_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct vt8231_data *data = dev_get_drvdata(dev);
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
unsigned long val;
int nr = sensor_attr->index;
int old = vt8231_read_value(data, VT8231_REG_FANDIV);
long min = FAN_FROM_REG(data->fan_min[nr],
DIV_FROM_REG(data->fan_div[nr]));
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
switch (val) {
case 1:
data->fan_div[nr] = 0;
break;
case 2:
data->fan_div[nr] = 1;
break;
case 4:
data->fan_div[nr] = 2;
break;
case 8:
data->fan_div[nr] = 3;
break;
default:
dev_err(dev,
"fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
val);
mutex_unlock(&data->update_lock);
return -EINVAL;
}
/* Correct the fan minimum speed */
data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
vt8231_write_value(data, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
vt8231_write_value(data, VT8231_REG_FANDIV, old);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
/* Alarms */
static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%d\n", data->alarms);
}
static DEVICE_ATTR_RO(alarms);
static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int bitnr = to_sensor_dev_attr(attr)->index;
struct vt8231_data *data = vt8231_update_device(dev);
return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}
static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 11);
static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(temp4_alarm, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(temp5_alarm, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(temp6_alarm, alarm, 8);
static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 11);
static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
static ssize_t name_show(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct vt8231_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR_RO(name);
static struct attribute *vt8231_attributes_temps[6][5] = {
{
&dev_attr_temp1_input.attr,
&dev_attr_temp1_max_hyst.attr,
&dev_attr_temp1_max.attr,
&sensor_dev_attr_temp1_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp4_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_temp5_input.dev_attr.attr,
&sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp5_max.dev_attr.attr,
&sensor_dev_attr_temp5_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_temp6_input.dev_attr.attr,
&sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
&sensor_dev_attr_temp6_max.dev_attr.attr,
&sensor_dev_attr_temp6_alarm.dev_attr.attr,
NULL
}
};
static const struct attribute_group vt8231_group_temps[6] = {
{ .attrs = vt8231_attributes_temps[0] },
{ .attrs = vt8231_attributes_temps[1] },
{ .attrs = vt8231_attributes_temps[2] },
{ .attrs = vt8231_attributes_temps[3] },
{ .attrs = vt8231_attributes_temps[4] },
{ .attrs = vt8231_attributes_temps[5] },
};
static struct attribute *vt8231_attributes_volts[6][5] = {
{
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_min.dev_attr.attr,
&sensor_dev_attr_in0_max.dev_attr.attr,
&sensor_dev_attr_in0_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_min.dev_attr.attr,
&sensor_dev_attr_in1_max.dev_attr.attr,
&sensor_dev_attr_in1_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_min.dev_attr.attr,
&sensor_dev_attr_in2_max.dev_attr.attr,
&sensor_dev_attr_in2_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in3_min.dev_attr.attr,
&sensor_dev_attr_in3_max.dev_attr.attr,
&sensor_dev_attr_in3_alarm.dev_attr.attr,
NULL
}, {
&sensor_dev_attr_in4_input.dev_attr.attr,
&sensor_dev_attr_in4_min.dev_attr.attr,
&sensor_dev_attr_in4_max.dev_attr.attr,
&sensor_dev_attr_in4_alarm.dev_attr.attr,
NULL
}, {
&dev_attr_in5_input.attr,
&dev_attr_in5_min.attr,
&dev_attr_in5_max.attr,
&sensor_dev_attr_in5_alarm.dev_attr.attr,
NULL
}
};
static const struct attribute_group vt8231_group_volts[6] = {
{ .attrs = vt8231_attributes_volts[0] },
{ .attrs = vt8231_attributes_volts[1] },
{ .attrs = vt8231_attributes_volts[2] },
{ .attrs = vt8231_attributes_volts[3] },
{ .attrs = vt8231_attributes_volts[4] },
{ .attrs = vt8231_attributes_volts[5] },
};
static struct attribute *vt8231_attributes[] = {
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan2_min.dev_attr.attr,
&sensor_dev_attr_fan1_div.dev_attr.attr,
&sensor_dev_attr_fan2_div.dev_attr.attr,
&sensor_dev_attr_fan1_alarm.dev_attr.attr,
&sensor_dev_attr_fan2_alarm.dev_attr.attr,
&dev_attr_alarms.attr,
&dev_attr_name.attr,
NULL
};
static const struct attribute_group vt8231_group = {
.attrs = vt8231_attributes,
};
static struct platform_driver vt8231_driver = {
.driver = {
.name = "vt8231",
},
.probe = vt8231_probe,
.remove = vt8231_remove,
};
static const struct pci_device_id vt8231_pci_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
static int vt8231_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id);
static struct pci_driver vt8231_pci_driver = {
.name = "vt8231",
.id_table = vt8231_pci_ids,
.probe = vt8231_pci_probe,
};
static int vt8231_probe(struct platform_device *pdev)
{
struct resource *res;
struct vt8231_data *data;
int err = 0, i;
/* Reserve the ISA region */
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!devm_request_region(&pdev->dev, res->start, VT8231_EXTENT,
vt8231_driver.driver.name)) {
dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
(unsigned long)res->start, (unsigned long)res->end);
return -ENODEV;
}
data = devm_kzalloc(&pdev->dev, sizeof(struct vt8231_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
platform_set_drvdata(pdev, data);
data->addr = res->start;
data->name = "vt8231";
mutex_init(&data->update_lock);
vt8231_init_device(data);
/* Register sysfs hooks */
err = sysfs_create_group(&pdev->dev.kobj, &vt8231_group);
if (err)
return err;
/* Must update device information to find out the config field */
data->uch_config = vt8231_read_value(data, VT8231_REG_UCH_CONFIG);
for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
if (ISTEMP(i, data->uch_config)) {
err = sysfs_create_group(&pdev->dev.kobj,
&vt8231_group_temps[i]);
if (err)
goto exit_remove_files;
}
}
for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
if (ISVOLT(i, data->uch_config)) {
err = sysfs_create_group(&pdev->dev.kobj,
&vt8231_group_volts[i]);
if (err)
goto exit_remove_files;
}
}
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove_files;
}
return 0;
exit_remove_files:
for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
return err;
}
static int vt8231_remove(struct platform_device *pdev)
{
struct vt8231_data *data = platform_get_drvdata(pdev);
int i;
hwmon_device_unregister(data->hwmon_dev);
for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_volts[i]);
for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
sysfs_remove_group(&pdev->dev.kobj, &vt8231_group_temps[i]);
sysfs_remove_group(&pdev->dev.kobj, &vt8231_group);
return 0;
}
static void vt8231_init_device(struct vt8231_data *data)
{
vt8231_write_value(data, VT8231_REG_TEMP1_CONFIG, 0);
vt8231_write_value(data, VT8231_REG_TEMP2_CONFIG, 0);
}
static struct vt8231_data *vt8231_update_device(struct device *dev)
{
struct vt8231_data *data = dev_get_drvdata(dev);
int i;
u16 low;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
for (i = 0; i < 6; i++) {
if (ISVOLT(i, data->uch_config)) {
data->in[i] = vt8231_read_value(data,
regvolt[i]);
data->in_min[i] = vt8231_read_value(data,
regvoltmin[i]);
data->in_max[i] = vt8231_read_value(data,
regvoltmax[i]);
}
}
for (i = 0; i < 2; i++) {
data->fan[i] = vt8231_read_value(data,
VT8231_REG_FAN(i));
data->fan_min[i] = vt8231_read_value(data,
VT8231_REG_FAN_MIN(i));
}
low = vt8231_read_value(data, VT8231_REG_TEMP_LOW01);
low = (low >> 6) | ((low & 0x30) >> 2)
| (vt8231_read_value(data, VT8231_REG_TEMP_LOW25) << 4);
for (i = 0; i < 6; i++) {
if (ISTEMP(i, data->uch_config)) {
data->temp[i] = (vt8231_read_value(data,
regtemp[i]) << 2)
| ((low >> (2 * i)) & 0x03);
data->temp_max[i] = vt8231_read_value(data,
regtempmax[i]);
data->temp_min[i] = vt8231_read_value(data,
regtempmin[i]);
}
}
i = vt8231_read_value(data, VT8231_REG_FANDIV);
data->fan_div[0] = (i >> 4) & 0x03;
data->fan_div[1] = i >> 6;
data->alarms = vt8231_read_value(data, VT8231_REG_ALARM1) |
(vt8231_read_value(data, VT8231_REG_ALARM2) << 8);
/* Set alarm flags correctly */
if (!data->fan[0] && data->fan_min[0])
data->alarms |= 0x40;
else if (data->fan[0] && !data->fan_min[0])
data->alarms &= ~0x40;
if (!data->fan[1] && data->fan_min[1])
data->alarms |= 0x80;
else if (data->fan[1] && !data->fan_min[1])
data->alarms &= ~0x80;
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static int vt8231_device_add(unsigned short address)
{
struct resource res = {
.start = address,
.end = address + VT8231_EXTENT - 1,
.name = "vt8231",
.flags = IORESOURCE_IO,
};
int err;
err = acpi_check_resource_conflict(&res);
if (err)
goto exit;
pdev = platform_device_alloc("vt8231", address);
if (!pdev) {
err = -ENOMEM;
pr_err("Device allocation failed\n");
goto exit;
}
err = platform_device_add_resources(pdev, &res, 1);
if (err) {
pr_err("Device resource addition failed (%d)\n", err);
goto exit_device_put;
}
err = platform_device_add(pdev);
if (err) {
pr_err("Device addition failed (%d)\n", err);
goto exit_device_put;
}
return 0;
exit_device_put:
platform_device_put(pdev);
exit:
return err;
}
static int vt8231_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
u16 address, val;
if (force_addr) {
address = force_addr & 0xff00;
dev_warn(&dev->dev, "Forcing ISA address 0x%x\n",
address);
if (PCIBIOS_SUCCESSFUL !=
pci_write_config_word(dev, VT8231_BASE_REG, address | 1))
return -ENODEV;
}
pci_read_config_word(dev, VT8231_BASE_REG, &val);
if (val == (u16)~0)
return -ENODEV;
address = val & ~(VT8231_EXTENT - 1);
if (address == 0) {
dev_err(&dev->dev, "base address not set - upgrade BIOS or use force_addr=0xaddr\n");
return -ENODEV;
}
pci_read_config_word(dev, VT8231_ENABLE_REG, &val);
if (val == (u16)~0)
return -ENODEV;
if (!(val & 0x0001)) {
dev_warn(&dev->dev, "enabling sensors\n");
if (PCIBIOS_SUCCESSFUL !=
pci_write_config_word(dev, VT8231_ENABLE_REG,
val | 0x0001))
return -ENODEV;
}
if (platform_driver_register(&vt8231_driver))
goto exit;
/* Sets global pdev as a side effect */
if (vt8231_device_add(address))
goto exit_unregister;
/*
* Always return failure here. This is to allow other drivers to bind
* to this pci device. We don't really want to have control over the
* pci device, we only wanted to read as few register values from it.
*/
/*
* We do, however, mark ourselves as using the PCI device to stop it
* getting unloaded.
*/
s_bridge = pci_dev_get(dev);
return -ENODEV;
exit_unregister:
platform_driver_unregister(&vt8231_driver);
exit:
return -ENODEV;
}
static int __init sm_vt8231_init(void)
{
return pci_register_driver(&vt8231_pci_driver);
}
static void __exit sm_vt8231_exit(void)
{
pci_unregister_driver(&vt8231_pci_driver);
if (s_bridge != NULL) {
platform_device_unregister(pdev);
platform_driver_unregister(&vt8231_driver);
pci_dev_put(s_bridge);
s_bridge = NULL;
}
}
MODULE_AUTHOR("Roger Lucas <vt8231@hiddenengine.co.uk>");
MODULE_DESCRIPTION("VT8231 sensors");
MODULE_LICENSE("GPL");
module_init(sm_vt8231_init);
module_exit(sm_vt8231_exit);
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