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linux/drivers/hwmon/sch5627.c
Hans de Goede 312869ec93 hwmon: (sch56xx) Add support for the integrated watchdog (v2) 
Add support for the watchdog integrated into the SMSC SCH5627 and
SCH5636 superio-s. Since the watchdog is part of the hwmon logical device
and thus shares ioports with it, the watchdog driver is integrated into the
existing hwmon drivers for these.

Note that this version of the watchdog support for sch56xx superio-s
implements the watchdog chardev interface itself, rather then relying on
the recently added watchdog core / watchdog_dev. This is done because
currently some needed functionality is missing from watchdog_dev, as soon
as this functionality is added (which is being discussed on the
linux-watchdog mailinglist), I'll convert this driver over to using
watchdog_dev.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[guenter.roeck@ericsson.com: Added missing linux/slab.h include]
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2012-03-20 06:42:05 -07:00

607 lines
19 KiB
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/***************************************************************************
* Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com> *
* *
* 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., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include "sch56xx-common.h"
#define DRVNAME "sch5627"
#define DEVNAME DRVNAME /* We only support one model */
#define SCH5627_HWMON_ID 0xa5
#define SCH5627_COMPANY_ID 0x5c
#define SCH5627_PRIMARY_ID 0xa0
#define SCH5627_REG_BUILD_CODE 0x39
#define SCH5627_REG_BUILD_ID 0x3a
#define SCH5627_REG_HWMON_ID 0x3c
#define SCH5627_REG_HWMON_REV 0x3d
#define SCH5627_REG_COMPANY_ID 0x3e
#define SCH5627_REG_PRIMARY_ID 0x3f
#define SCH5627_REG_CTRL 0x40
#define SCH5627_NO_TEMPS 8
#define SCH5627_NO_FANS 4
#define SCH5627_NO_IN 5
static const u16 SCH5627_REG_TEMP_MSB[SCH5627_NO_TEMPS] = {
0x2B, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x180, 0x181 };
static const u16 SCH5627_REG_TEMP_LSN[SCH5627_NO_TEMPS] = {
0xE2, 0xE1, 0xE1, 0xE5, 0xE5, 0xE6, 0x182, 0x182 };
static const u16 SCH5627_REG_TEMP_HIGH_NIBBLE[SCH5627_NO_TEMPS] = {
0, 0, 1, 1, 0, 0, 0, 1 };
static const u16 SCH5627_REG_TEMP_HIGH[SCH5627_NO_TEMPS] = {
0x61, 0x57, 0x59, 0x5B, 0x5D, 0x5F, 0x184, 0x186 };
static const u16 SCH5627_REG_TEMP_ABS[SCH5627_NO_TEMPS] = {
0x9B, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x1A8, 0x1A9 };
static const u16 SCH5627_REG_FAN[SCH5627_NO_FANS] = {
0x2C, 0x2E, 0x30, 0x32 };
static const u16 SCH5627_REG_FAN_MIN[SCH5627_NO_FANS] = {
0x62, 0x64, 0x66, 0x68 };
static const u16 SCH5627_REG_IN_MSB[SCH5627_NO_IN] = {
0x22, 0x23, 0x24, 0x25, 0x189 };
static const u16 SCH5627_REG_IN_LSN[SCH5627_NO_IN] = {
0xE4, 0xE4, 0xE3, 0xE3, 0x18A };
static const u16 SCH5627_REG_IN_HIGH_NIBBLE[SCH5627_NO_IN] = {
1, 0, 1, 0, 1 };
static const u16 SCH5627_REG_IN_FACTOR[SCH5627_NO_IN] = {
10745, 3660, 9765, 10745, 3660 };
static const char * const SCH5627_IN_LABELS[SCH5627_NO_IN] = {
"VCC", "VTT", "VBAT", "VTR", "V_IN" };
struct sch5627_data {
unsigned short addr;
struct device *hwmon_dev;
struct sch56xx_watchdog_data *watchdog;
u8 control;
u8 temp_max[SCH5627_NO_TEMPS];
u8 temp_crit[SCH5627_NO_TEMPS];
u16 fan_min[SCH5627_NO_FANS];
struct mutex update_lock;
unsigned long last_battery; /* In jiffies */
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u16 temp[SCH5627_NO_TEMPS];
u16 fan[SCH5627_NO_FANS];
u16 in[SCH5627_NO_IN];
};
static struct sch5627_data *sch5627_update_device(struct device *dev)
{
struct sch5627_data *data = dev_get_drvdata(dev);
struct sch5627_data *ret = data;
int i, val;
mutex_lock(&data->update_lock);
/* Trigger a Vbat voltage measurement every 5 minutes */
if (time_after(jiffies, data->last_battery + 300 * HZ)) {
sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
data->control | 0x10);
data->last_battery = jiffies;
}
/* Cache the values for 1 second */
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
for (i = 0; i < SCH5627_NO_TEMPS; i++) {
val = sch56xx_read_virtual_reg12(data->addr,
SCH5627_REG_TEMP_MSB[i],
SCH5627_REG_TEMP_LSN[i],
SCH5627_REG_TEMP_HIGH_NIBBLE[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
data->temp[i] = val;
}
for (i = 0; i < SCH5627_NO_FANS; i++) {
val = sch56xx_read_virtual_reg16(data->addr,
SCH5627_REG_FAN[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
data->fan[i] = val;
}
for (i = 0; i < SCH5627_NO_IN; i++) {
val = sch56xx_read_virtual_reg12(data->addr,
SCH5627_REG_IN_MSB[i],
SCH5627_REG_IN_LSN[i],
SCH5627_REG_IN_HIGH_NIBBLE[i]);
if (unlikely(val < 0)) {
ret = ERR_PTR(val);
goto abort;
}
data->in[i] = val;
}
data->last_updated = jiffies;
data->valid = 1;
}
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static int __devinit sch5627_read_limits(struct sch5627_data *data)
{
int i, val;
for (i = 0; i < SCH5627_NO_TEMPS; i++) {
/*
* Note what SMSC calls ABS, is what lm_sensors calls max
* (aka high), and HIGH is what lm_sensors calls crit.
*/
val = sch56xx_read_virtual_reg(data->addr,
SCH5627_REG_TEMP_ABS[i]);
if (val < 0)
return val;
data->temp_max[i] = val;
val = sch56xx_read_virtual_reg(data->addr,
SCH5627_REG_TEMP_HIGH[i]);
if (val < 0)
return val;
data->temp_crit[i] = val;
}
for (i = 0; i < SCH5627_NO_FANS; i++) {
val = sch56xx_read_virtual_reg16(data->addr,
SCH5627_REG_FAN_MIN[i]);
if (val < 0)
return val;
data->fan_min[i] = val;
}
return 0;
}
static int reg_to_temp(u16 reg)
{
return (reg * 625) / 10 - 64000;
}
static int reg_to_temp_limit(u8 reg)
{
return (reg - 64) * 1000;
}
static int reg_to_rpm(u16 reg)
{
if (reg == 0)
return -EIO;
if (reg == 0xffff)
return 0;
return 5400540 / reg;
}
static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", DEVNAME);
}
static ssize_t show_temp(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = sch5627_update_device(dev);
int val;
if (IS_ERR(data))
return PTR_ERR(data);
val = reg_to_temp(data->temp[attr->index]);
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t show_temp_fault(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = sch5627_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return snprintf(buf, PAGE_SIZE, "%d\n", data->temp[attr->index] == 0);
}
static ssize_t show_temp_max(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = dev_get_drvdata(dev);
int val;
val = reg_to_temp_limit(data->temp_max[attr->index]);
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t show_temp_crit(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = dev_get_drvdata(dev);
int val;
val = reg_to_temp_limit(data->temp_crit[attr->index]);
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t show_fan(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = sch5627_update_device(dev);
int val;
if (IS_ERR(data))
return PTR_ERR(data);
val = reg_to_rpm(data->fan[attr->index]);
if (val < 0)
return val;
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t show_fan_fault(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = sch5627_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
return snprintf(buf, PAGE_SIZE, "%d\n",
data->fan[attr->index] == 0xffff);
}
static ssize_t show_fan_min(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = dev_get_drvdata(dev);
int val = reg_to_rpm(data->fan_min[attr->index]);
if (val < 0)
return val;
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t show_in(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct sch5627_data *data = sch5627_update_device(dev);
int val;
if (IS_ERR(data))
return PTR_ERR(data);
val = DIV_ROUND_CLOSEST(
data->in[attr->index] * SCH5627_REG_IN_FACTOR[attr->index],
10000);
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t show_in_label(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
return snprintf(buf, PAGE_SIZE, "%s\n",
SCH5627_IN_LABELS[attr->index]);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp, NULL, 5);
static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp, NULL, 6);
static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp, NULL, 7);
static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_temp_fault, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_temp_fault, NULL, 5);
static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_temp_fault, NULL, 6);
static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_temp_fault, NULL, 7);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_max, S_IRUGO, show_temp_max, NULL, 5);
static SENSOR_DEVICE_ATTR(temp7_max, S_IRUGO, show_temp_max, NULL, 6);
static SENSOR_DEVICE_ATTR(temp8_max, S_IRUGO, show_temp_max, NULL, 7);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp_crit, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_crit, S_IRUGO, show_temp_crit, NULL, 4);
static SENSOR_DEVICE_ATTR(temp6_crit, S_IRUGO, show_temp_crit, NULL, 5);
static SENSOR_DEVICE_ATTR(temp7_crit, S_IRUGO, show_temp_crit, NULL, 6);
static SENSOR_DEVICE_ATTR(temp8_crit, S_IRUGO, show_temp_crit, NULL, 7);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, show_fan_fault, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, show_fan_fault, NULL, 3);
static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan_min, NULL, 0);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan_min, NULL, 1);
static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO, show_fan_min, NULL, 2);
static SENSOR_DEVICE_ATTR(fan4_min, S_IRUGO, show_fan_min, NULL, 3);
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in, NULL, 4);
static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_in_label, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_in_label, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_in_label, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_in_label, NULL, 3);
static struct attribute *sch5627_attributes[] = {
&dev_attr_name.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp5_input.dev_attr.attr,
&sensor_dev_attr_temp6_input.dev_attr.attr,
&sensor_dev_attr_temp7_input.dev_attr.attr,
&sensor_dev_attr_temp8_input.dev_attr.attr,
&sensor_dev_attr_temp1_fault.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp4_fault.dev_attr.attr,
&sensor_dev_attr_temp5_fault.dev_attr.attr,
&sensor_dev_attr_temp6_fault.dev_attr.attr,
&sensor_dev_attr_temp7_fault.dev_attr.attr,
&sensor_dev_attr_temp8_fault.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp5_max.dev_attr.attr,
&sensor_dev_attr_temp6_max.dev_attr.attr,
&sensor_dev_attr_temp7_max.dev_attr.attr,
&sensor_dev_attr_temp8_max.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp4_crit.dev_attr.attr,
&sensor_dev_attr_temp5_crit.dev_attr.attr,
&sensor_dev_attr_temp6_crit.dev_attr.attr,
&sensor_dev_attr_temp7_crit.dev_attr.attr,
&sensor_dev_attr_temp8_crit.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan3_input.dev_attr.attr,
&sensor_dev_attr_fan4_input.dev_attr.attr,
&sensor_dev_attr_fan1_fault.dev_attr.attr,
&sensor_dev_attr_fan2_fault.dev_attr.attr,
&sensor_dev_attr_fan3_fault.dev_attr.attr,
&sensor_dev_attr_fan4_fault.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan2_min.dev_attr.attr,
&sensor_dev_attr_fan3_min.dev_attr.attr,
&sensor_dev_attr_fan4_min.dev_attr.attr,
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in4_input.dev_attr.attr,
&sensor_dev_attr_in0_label.dev_attr.attr,
&sensor_dev_attr_in1_label.dev_attr.attr,
&sensor_dev_attr_in2_label.dev_attr.attr,
&sensor_dev_attr_in3_label.dev_attr.attr,
/* No in4_label as in4 is a generic input pin */
NULL
};
static const struct attribute_group sch5627_group = {
.attrs = sch5627_attributes,
};
static int sch5627_remove(struct platform_device *pdev)
{
struct sch5627_data *data = platform_get_drvdata(pdev);
if (data->watchdog)
sch56xx_watchdog_unregister(data->watchdog);
if (data->hwmon_dev)
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&pdev->dev.kobj, &sch5627_group);
platform_set_drvdata(pdev, NULL);
kfree(data);
return 0;
}
static int __devinit sch5627_probe(struct platform_device *pdev)
{
struct sch5627_data *data;
int err, build_code, build_id, hwmon_rev, val;
data = kzalloc(sizeof(struct sch5627_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
mutex_init(&data->update_lock);
platform_set_drvdata(pdev, data);
val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_HWMON_ID);
if (val < 0) {
err = val;
goto error;
}
if (val != SCH5627_HWMON_ID) {
pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "hwmon",
val, SCH5627_HWMON_ID);
err = -ENODEV;
goto error;
}
val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_COMPANY_ID);
if (val < 0) {
err = val;
goto error;
}
if (val != SCH5627_COMPANY_ID) {
pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "company",
val, SCH5627_COMPANY_ID);
err = -ENODEV;
goto error;
}
val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_PRIMARY_ID);
if (val < 0) {
err = val;
goto error;
}
if (val != SCH5627_PRIMARY_ID) {
pr_err("invalid %s id: 0x%02X (expected 0x%02X)\n", "primary",
val, SCH5627_PRIMARY_ID);
err = -ENODEV;
goto error;
}
build_code = sch56xx_read_virtual_reg(data->addr,
SCH5627_REG_BUILD_CODE);
if (build_code < 0) {
err = build_code;
goto error;
}
build_id = sch56xx_read_virtual_reg16(data->addr,
SCH5627_REG_BUILD_ID);
if (build_id < 0) {
err = build_id;
goto error;
}
hwmon_rev = sch56xx_read_virtual_reg(data->addr,
SCH5627_REG_HWMON_REV);
if (hwmon_rev < 0) {
err = hwmon_rev;
goto error;
}
val = sch56xx_read_virtual_reg(data->addr, SCH5627_REG_CTRL);
if (val < 0) {
err = val;
goto error;
}
data->control = val;
if (!(data->control & 0x01)) {
pr_err("hardware monitoring not enabled\n");
err = -ENODEV;
goto error;
}
/* Trigger a Vbat voltage measurement, so that we get a valid reading
the first time we read Vbat */
sch56xx_write_virtual_reg(data->addr, SCH5627_REG_CTRL,
data->control | 0x10);
data->last_battery = jiffies;
/*
* Read limits, we do this only once as reading a register on
* the sch5627 is quite expensive (and they don't change).
*/
err = sch5627_read_limits(data);
if (err)
goto error;
pr_info("found %s chip at %#hx\n", DEVNAME, data->addr);
pr_info("firmware build: code 0x%02X, id 0x%04X, hwmon: rev 0x%02X\n",
build_code, build_id, hwmon_rev);
/* Register sysfs interface files */
err = sysfs_create_group(&pdev->dev.kobj, &sch5627_group);
if (err)
goto error;
data->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
data->hwmon_dev = NULL;
goto error;
}
/* Note failing to register the watchdog is not a fatal error */
data->watchdog = sch56xx_watchdog_register(data->addr,
(build_code << 24) | (build_id << 8) | hwmon_rev,
&data->update_lock, 1);
return 0;
error:
sch5627_remove(pdev);
return err;
}
static struct platform_driver sch5627_driver = {
.driver = {
.owner = THIS_MODULE,
.name = DRVNAME,
},
.probe = sch5627_probe,
.remove = sch5627_remove,
};
module_platform_driver(sch5627_driver);
MODULE_DESCRIPTION("SMSC SCH5627 Hardware Monitoring Driver");
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_LICENSE("GPL");
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