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hwmon: Add WM835x PMIC hardware monitoring driver 

This driver provides reporting of the status supply voltage rails
of the WM835x series of PMICs via the hwmon API.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2009-07-20 12:43:45 +01:00 committed by Samuel Ortiz
parent 39b1772a24
commit fb6c023a2b
6 changed files with 197 additions and 0 deletions
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26
Documentation/hwmon/wm8350 Normal file
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@ -0,0 +1,26 @@
Kernel driver wm8350-hwmon
==========================
Supported chips:
* Wolfson Microelectronics WM835x PMICs
Prefix: 'wm8350'
Datasheet:
http://www.wolfsonmicro.com/products/WM8350
http://www.wolfsonmicro.com/products/WM8351
http://www.wolfsonmicro.com/products/WM8352
Authors: Mark Brown <broonie@opensource.wolfsonmicro.com>
Description
-----------
The WM835x series of PMICs include an AUXADC which can be used to
monitor a range of system operating parameters, including the voltages
of the major supplies within the system. Currently the driver provides
simple access to these major supplies.
Voltage Monitoring
------------------
Voltages are sampled by a 12 bit ADC. For the internal supplies the ADC
is referenced to the system VRTC.

10
drivers/hwmon/Kconfig
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@ -937,6 +937,16 @@ config SENSORS_W83627EHF
This driver can also be built as a module. If so, the module
will be called w83627ehf.
config SENSORS_WM8350
tristate "Wolfson Microelectronics WM835x"
depends on MFD_WM8350
help
If you say yes here you get support for the hardware
monitoring features of the WM835x series of PMICs.
This driver can also be built as a module. If so, the module
will be called wm8350-hwmon.
config SENSORS_ULTRA45
tristate "Sun Ultra45 PIC16F747"
depends on SPARC64

1
drivers/hwmon/Makefile
View File

@ -90,6 +90,7 @@ obj-$(CONFIG_SENSORS_VT8231) += vt8231.o
obj-$(CONFIG_SENSORS_W83627EHF) += w83627ehf.o
obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o
obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
EXTRA_CFLAGS += -DDEBUG

151
drivers/hwmon/wm8350-hwmon.c Normal file
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@ -0,0 +1,151 @@
/*
* drivers/hwmon/wm8350-hwmon.c - Wolfson Microelectronics WM8350 PMIC
* hardware monitoring features.
*
* Copyright (C) 2009 Wolfson Microelectronics plc
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License v2 as published by the
* Free Software Foundation.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/comparator.h>
static ssize_t show_name(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "wm8350\n");
}
static const char *input_names[] = {
[WM8350_AUXADC_USB] = "USB",
[WM8350_AUXADC_LINE] = "Line",
[WM8350_AUXADC_BATT] = "Battery",
};
static ssize_t show_voltage(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct wm8350 *wm8350 = dev_get_drvdata(dev);
int channel = to_sensor_dev_attr(attr)->index;
int val;
val = wm8350_read_auxadc(wm8350, channel, 0, 0) * WM8350_AUX_COEFF;
val = DIV_ROUND_CLOSEST(val, 1000);
return sprintf(buf, "%d\n", val);
}
static ssize_t show_label(struct device *dev,
struct device_attribute *attr, char *buf)
{
int channel = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%s\n", input_names[channel]);
}
#define WM8350_NAMED_VOLTAGE(id, name) \
static SENSOR_DEVICE_ATTR(in##id##_input, S_IRUGO, show_voltage,\
NULL, name); \
static SENSOR_DEVICE_ATTR(in##id##_label, S_IRUGO, show_label, \
NULL, name)
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
WM8350_NAMED_VOLTAGE(0, WM8350_AUXADC_USB);
WM8350_NAMED_VOLTAGE(1, WM8350_AUXADC_BATT);
WM8350_NAMED_VOLTAGE(2, WM8350_AUXADC_LINE);
static struct attribute *wm8350_attributes[] = {
&dev_attr_name.attr,
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_label.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_label.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_label.dev_attr.attr,
NULL,
};
static const struct attribute_group wm8350_attr_group = {
.attrs = wm8350_attributes,
};
static int __devinit wm8350_hwmon_probe(struct platform_device *pdev)
{
struct wm8350 *wm8350 = platform_get_drvdata(pdev);
int ret;
ret = sysfs_create_group(&pdev->dev.kobj, &wm8350_attr_group);
if (ret)
goto err;
wm8350->hwmon.classdev = hwmon_device_register(&pdev->dev);
if (IS_ERR(wm8350->hwmon.classdev)) {
ret = PTR_ERR(wm8350->hwmon.classdev);
goto err_group;
}
return 0;
err_group:
sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group);
err:
return ret;
}
static int __devexit wm8350_hwmon_remove(struct platform_device *pdev)
{
struct wm8350 *wm8350 = platform_get_drvdata(pdev);
hwmon_device_unregister(wm8350->hwmon.classdev);
sysfs_remove_group(&pdev->dev.kobj, &wm8350_attr_group);
return 0;
}
static struct platform_driver wm8350_hwmon_driver = {
.probe = wm8350_hwmon_probe,
.remove = __devexit_p(wm8350_hwmon_remove),
.driver = {
.name = "wm8350-hwmon",
.owner = THIS_MODULE,
},
};
static int __init wm8350_hwmon_init(void)
{
return platform_driver_register(&wm8350_hwmon_driver);
}
module_init(wm8350_hwmon_init);
static void __exit wm8350_hwmon_exit(void)
{
platform_driver_unregister(&wm8350_hwmon_driver);
}
module_exit(wm8350_hwmon_exit);
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM8350 Hardware Monitoring");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8350-hwmon");

3
drivers/mfd/wm8350-core.c
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@ -1472,6 +1472,8 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq,
&(wm8350->codec.pdev));
wm8350_client_dev_register(wm8350, "wm8350-gpio",
&(wm8350->gpio.pdev));
wm8350_client_dev_register(wm8350, "wm8350-hwmon",
&(wm8350->hwmon.pdev));
wm8350_client_dev_register(wm8350, "wm8350-power",
&(wm8350->power.pdev));
wm8350_client_dev_register(wm8350, "wm8350-rtc", &(wm8350->rtc.pdev));
@ -1498,6 +1500,7 @@ void wm8350_device_exit(struct wm8350 *wm8350)
platform_device_unregister(wm8350->wdt.pdev);
platform_device_unregister(wm8350->rtc.pdev);
platform_device_unregister(wm8350->power.pdev);
platform_device_unregister(wm8350->hwmon.pdev);
platform_device_unregister(wm8350->gpio.pdev);
platform_device_unregister(wm8350->codec.pdev);

6
include/linux/mfd/wm8350/core.h
View File

@ -605,6 +605,11 @@ struct wm8350_irq {
void *data;
};
struct wm8350_hwmon {
struct platform_device *pdev;
struct device *classdev;
};
struct wm8350 {
struct device *dev;
@ -629,6 +634,7 @@ struct wm8350 {
/* Client devices */
struct wm8350_codec codec;
struct wm8350_gpio gpio;
struct wm8350_hwmon hwmon;
struct wm8350_pmic pmic;
struct wm8350_power power;
struct wm8350_rtc rtc;