hwmon: Add WM835x PMIC hardware monitoring driver (fb6c023a) · Commits · e / devices / android_kernel_fairphone_FP4

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

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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

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		@@ -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

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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);