hwmon: Add Freescale MC13783 ADC driver (93ee0a75) · Commits · e / devices / android_kernel_xiaomi_markw

Documentation/hwmon/mc13783-adc

0 → 100644

+50 −0

Original line number	Diff line number	Diff line
		Kernel driver mc13783-adc
		=========================

		Supported chips:
		* Freescale Atlas MC13783
		Prefix: 'mc13783_adc'
		Datasheet: http://www.freescale.com/files/rf_if/doc/data_sheet/MC13783.pdf?fsrch=1

		Authors:
		Sascha Hauer <s.hauer@pengutronix.de>
		Luotao Fu <l.fu@pengutronix.de>

		Description
		-----------

		The Freescale MC13783 is a Power Management and Audio Circuit. Among
		other things it contains a 10-bit A/D converter. The converter has 16
		channels which can be used in different modes.
		The A/D converter has a resolution of 2.25mV. Channels 0-4 have
		a dedicated meaning with chip internal scaling applied. Channels 5-7
		can be used as general purpose inputs or alternatively in a dedicated
		mode. Channels 12-15 are occupied by the touchscreen if it's active.

		Currently the driver only supports channels 2 and 5-15 with no alternative
		modes for channels 5-7.

		See this table for the meaning of the different channels and their chip
		internal scaling:

		Channel Signal Input Range Scaling
		-------------------------------------------------------------------------------
		0 Battery Voltage (BATT) 2.50 - 4.65V -2.40V
		1 Battery Current (BATT - BATTISNS) -50 - 50 mV x20
		2 Application Supply (BP) 2.50 - 4.65V -2.40V
		3 Charger Voltage (CHRGRAW) 0 - 10V / /5
		0 - 20V /10
		4 Charger Current (CHRGISNSP-CHRGISNSN) -0.25V - 0.25V x4
		5 General Purpose ADIN5 / Battery Pack Thermistor 0 - 2.30V No
		6 General Purpose ADIN6 / Backup Voltage (LICELL) 0 - 2.30V / No /
		1.50 - 3.50V -1.20V
		7 General Purpose ADIN7 / UID / Die Temperature 0 - 2.30V / No /
		0 - 2.55V / x0.9 / No
		8 General Purpose ADIN8 0 - 2.30V No
		9 General Purpose ADIN9 0 - 2.30V No
		10 General Purpose ADIN10 0 - 2.30V No
		11 General Purpose ADIN11 0 - 2.30V No
		12 General Purpose TSX1 / Touchscreen X-plate 1 0 - 2.30V No
		13 General Purpose TSX2 / Touchscreen X-plate 2 0 - 2.30V No
		14 General Purpose TSY1 / Touchscreen Y-plate 1 0 - 2.30V No
		15 General Purpose TSY2 / Touchscreen Y-plate 2 0 - 2.30V No

drivers/hwmon/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -1017,6 +1017,12 @@ config SENSORS_APPLESMC
		Say Y here if you have an applicable laptop and want to experience
		the awesome power of applesmc.

		config SENSORS_MC13783_ADC
		tristate "Freescale MC13783 ADC"
		depends on MFD_MC13783
		help
		Support for the A/D converter on MC13783 PMIC.

		if ACPI

		comment "ACPI drivers"

drivers/hwmon/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -74,6 +74,7 @@ obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
		obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
		obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
		obj-$(CONFIG_SENSORS_MAX6650) += max6650.o
		obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o
		obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
		obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
		obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o

drivers/hwmon/mc13783-adc.c

0 → 100644

+236 −0

Original line number	Diff line number	Diff line
		/*
		* Driver for the Freescale Semiconductor MC13783 adc.
		*
		* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
		* Copyright (C) 2009 Sascha Hauer, Pengutronix
		*
		* 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., 51
		* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
		*/

		#include <linux/mfd/mc13783-private.h>
		#include <linux/platform_device.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/hwmon.h>
		#include <linux/init.h>
		#include <linux/err.h>

		#define MC13783_ADC_NAME "mc13783-adc"

		struct mc13783_adc_priv {
		struct mc13783 *mc13783;
		struct device *hwmon_dev;
		};

		static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute
		devattr, char buf)
		{
		return sprintf(buf, "mc13783_adc\n");
		}

		static int mc13783_adc_read(struct device *dev,
		struct device_attribute devattr, unsigned int val)
		{
		struct platform_device *pdev = to_platform_device(dev);
		struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
		struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
		unsigned int channel = attr->index;
		unsigned int sample[4];
		int ret;

		ret = mc13783_adc_do_conversion(priv->mc13783,
		MC13783_ADC_MODE_MULT_CHAN,
		channel, sample);
		if (ret)
		return ret;

		channel &= 0x7;

		*val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;

		return 0;
		}

		static ssize_t mc13783_adc_read_bp(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		unsigned val;
		int ret = mc13783_adc_read(dev, devattr, &val);

		if (ret)
		return ret;

		/*
		* BP (channel 2) reports with offset 2.4V to the actual value to fit
		* the input range of the ADC. unit = 2.25mV = 9/4 mV.
		*/
		val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;

		return sprintf(buf, "%u\n", val);
		}

		static ssize_t mc13783_adc_read_gp(struct device *dev,
		struct device_attribute devattr, char buf)
		{
		unsigned val;
		int ret = mc13783_adc_read(dev, devattr, &val);

		if (ret)
		return ret;

		/*
		* input range is [0, 2.3V], val has 10 bits, so each bit
		* is worth 9/4 mV.
		*/
		val = DIV_ROUND_CLOSEST(val * 9, 4);

		return sprintf(buf, "%u\n", val);
		}

		static DEVICE_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL);
		static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2);
		static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5);
		static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6);
		static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7);
		static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8);
		static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9);
		static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10);
		static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11);
		static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12);
		static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13);
		static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14);
		static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15);

		static struct attribute *mc13783_attr[] = {
		&dev_attr_name.attr,
		&sensor_dev_attr_in2_input.dev_attr.attr,
		&sensor_dev_attr_in5_input.dev_attr.attr,
		&sensor_dev_attr_in6_input.dev_attr.attr,
		&sensor_dev_attr_in7_input.dev_attr.attr,
		&sensor_dev_attr_in8_input.dev_attr.attr,
		&sensor_dev_attr_in9_input.dev_attr.attr,
		&sensor_dev_attr_in10_input.dev_attr.attr,
		&sensor_dev_attr_in11_input.dev_attr.attr,
		NULL
		};

		static const struct attribute_group mc13783_group = {
		.attrs = mc13783_attr,
		};

		/* last four channels may be occupied by the touchscreen */
		static struct attribute *mc13783_attr_ts[] = {
		&sensor_dev_attr_in12_input.dev_attr.attr,
		&sensor_dev_attr_in13_input.dev_attr.attr,
		&sensor_dev_attr_in14_input.dev_attr.attr,
		&sensor_dev_attr_in15_input.dev_attr.attr,
		NULL
		};

		static const struct attribute_group mc13783_group_ts = {
		.attrs = mc13783_attr_ts,
		};

		static int __init mc13783_adc_probe(struct platform_device *pdev)
		{
		struct mc13783_adc_priv *priv;
		int ret;

		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		priv->mc13783 = dev_get_drvdata(pdev->dev.parent);

		platform_set_drvdata(pdev, priv);

		/* Register sysfs hooks */
		ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group);
		if (ret)
		goto out_err_create1;

		if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN))
		ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
		if (ret)
		goto out_err_create2;

		priv->hwmon_dev = hwmon_device_register(&pdev->dev);
		if (IS_ERR(priv->hwmon_dev)) {
		ret = PTR_ERR(priv->hwmon_dev);
		dev_err(&pdev->dev,
		"hwmon_device_register failed with %d.\n", ret);
		goto out_err_register;
		}


		return 0;

		out_err_register:

		if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN))
		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
		out_err_create2:

		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);
		out_err_create1:

		platform_set_drvdata(pdev, NULL);
		kfree(priv);

		return ret;
		}

		static int __devexit mc13783_adc_remove(struct platform_device *pdev)
		{
		struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);

		hwmon_device_unregister(priv->hwmon_dev);

		if (!(priv->mc13783->flags & MC13783_USE_TOUCHSCREEN))
		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);

		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);

		platform_set_drvdata(pdev, NULL);
		kfree(priv);

		return 0;
		}

		static struct platform_driver mc13783_adc_driver = {
		.remove = __devexit_p(mc13783_adc_remove),
		.driver = {
		.owner = THIS_MODULE,
		.name = MC13783_ADC_NAME,
		},
		};

		static int __init mc13783_adc_init(void)
		{
		return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe);
		}

		static void __exit mc13783_adc_exit(void)
		{
		platform_driver_unregister(&mc13783_adc_driver);
		}

		module_init(mc13783_adc_init);
		module_exit(mc13783_adc_exit);

		MODULE_DESCRIPTION("MC13783 ADC driver");
		MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:" MC13783_ADC_NAME);