Commit fb6c023a authored by Mark Brown's avatar Mark Brown Committed by Samuel Ortiz
Browse files

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: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarJean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 39b1772a

Documentation/hwmon/wm8350

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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.

drivers/hwmon/Kconfig

+10 −0
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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

drivers/hwmon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/hwmon/wm8350-hwmon.c

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/*

 * 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");

drivers/mfd/wm8350-core.c

+3 −0
Original line number Diff line number Diff line
@@ -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);

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