drivers/hwmon/mc13783-adc.c - kernel/msm-4.9 - Gitiles

 /*
  * Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs.
  *
  * 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/mc13xxx.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/slab.h>
 #include <linux/init.h>
 #include <linux/err.h>

 #define DRIVER_NAME	"mc13783-adc"

 /* platform device id driver data */
 #define MC13783_ADC_16CHANS	1
 #define MC13783_ADC_BPDIV2	2

 struct mc13783_adc_priv {
 	struct mc13xxx *mc13xxx;
 	struct device *hwmon_dev;
 	char name[PLATFORM_NAME_SIZE];
 };

 static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute
 			      *devattr, char *buf)
 {
 	struct mc13783_adc_priv *priv = dev_get_drvdata(dev);

 	return sprintf(buf, "%s\n", priv->name);
 }

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

 	ret = mc13xxx_adc_do_conversion(priv->mc13xxx,
 			MC13XXX_ADC_MODE_MULT_CHAN,
 			channel, 0, 0, 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;
 	struct platform_device *pdev = to_platform_device(dev);
 	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
 	int ret = mc13783_adc_read(dev, devattr, &val);

 	if (ret)
 		return ret;

 	if (driver_data & MC13783_ADC_BPDIV2)
 		val = DIV_ROUND_CLOSEST(val * 9, 2);
 	else
 		/*
 		 * 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_base[] = {
 	&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,
 	NULL
 };

 static const struct attribute_group mc13783_group_base = {
 	.attrs = mc13783_attr_base,
 };

 /* these are only used if MC13783_ADC_16CHANS is provided in driver data */
 static struct attribute *mc13783_attr_16chans[] = {
 	&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_16chans = {
 	.attrs = mc13783_attr_16chans,
 };

 /* 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 mc13783_adc_use_touchscreen(struct platform_device *pdev)
 {
 	struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
 	unsigned flags = mc13xxx_get_flags(priv->mc13xxx);

 	return flags & MC13XXX_USE_TOUCHSCREEN;
 }

 static int __init mc13783_adc_probe(struct platform_device *pdev)
 {
 	struct mc13783_adc_priv *priv;
 	int ret;
 	const struct platform_device_id *id = platform_get_device_id(pdev);
 	char *dash;

 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
 	snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name);
 	dash = strchr(priv->name, '-');
 	if (dash)
 		*dash = '\0';

 	platform_set_drvdata(pdev, priv);

 	/* Register sysfs hooks */
 	ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base);
 	if (ret)
 		return ret;

 	if (id->driver_data & MC13783_ADC_16CHANS) {
 		ret = sysfs_create_group(&pdev->dev.kobj,
 				&mc13783_group_16chans);
 		if (ret)
 			goto out_err_create_16chans;
 	}

 	if (!mc13783_adc_use_touchscreen(pdev)) {
 		ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
 		if (ret)
 			goto out_err_create_ts;
 	}

 	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 (!mc13783_adc_use_touchscreen(pdev))
 		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
 out_err_create_ts:

 	if (id->driver_data & MC13783_ADC_16CHANS)
 		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
 out_err_create_16chans:

 	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
 	return ret;
 }

 static int mc13783_adc_remove(struct platform_device *pdev)
 {
 	struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
 	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;

 	hwmon_device_unregister(priv->hwmon_dev);

 	if (!mc13783_adc_use_touchscreen(pdev))
 		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);

 	if (driver_data & MC13783_ADC_16CHANS)
 		sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);

 	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);

 	return 0;
 }

 static const struct platform_device_id mc13783_adc_idtable[] = {
 	{
 		.name = "mc13783-adc",
 		.driver_data = MC13783_ADC_16CHANS,
 	}, {
 		.name = "mc13892-adc",
 		.driver_data = MC13783_ADC_BPDIV2,
 	}, {
 		/* sentinel */
 	}
 };
 MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable);

 static struct platform_driver mc13783_adc_driver = {
 	.remove		= mc13783_adc_remove,
 	.driver		= {
 		.name	= DRIVER_NAME,
 	},
 	.id_table	= mc13783_adc_idtable,
 };

 module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe);

 MODULE_DESCRIPTION("MC13783 ADC driver");
 MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
 MODULE_LICENSE("GPL");
	/*
	* Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs.
	*
	* 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/mc13xxx.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/slab.h>
	#include <linux/init.h>
	#include <linux/err.h>

	#define DRIVER_NAME "mc13783-adc"

	/* platform device id driver data */
	#define MC13783_ADC_16CHANS 1
	#define MC13783_ADC_BPDIV2 2

	struct mc13783_adc_priv {
	struct mc13xxx *mc13xxx;
	struct device *hwmon_dev;
	char name[PLATFORM_NAME_SIZE];
	};

	static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute
	devattr, char buf)
	{
	struct mc13783_adc_priv *priv = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", priv->name);
	}

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

	ret = mc13xxx_adc_do_conversion(priv->mc13xxx,
	MC13XXX_ADC_MODE_MULT_CHAN,
	channel, 0, 0, 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;
	struct platform_device *pdev = to_platform_device(dev);
	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
	int ret = mc13783_adc_read(dev, devattr, &val);

	if (ret)
	return ret;

	if (driver_data & MC13783_ADC_BPDIV2)
	val = DIV_ROUND_CLOSEST(val * 9, 2);
	else
	/*
	* 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_base[] = {
	&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,
	NULL
	};

	static const struct attribute_group mc13783_group_base = {
	.attrs = mc13783_attr_base,
	};

	/* these are only used if MC13783_ADC_16CHANS is provided in driver data */
	static struct attribute *mc13783_attr_16chans[] = {
	&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_16chans = {
	.attrs = mc13783_attr_16chans,
	};

	/* 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 mc13783_adc_use_touchscreen(struct platform_device *pdev)
	{
	struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
	unsigned flags = mc13xxx_get_flags(priv->mc13xxx);

	return flags & MC13XXX_USE_TOUCHSCREEN;
	}

	static int __init mc13783_adc_probe(struct platform_device *pdev)
	{
	struct mc13783_adc_priv *priv;
	int ret;
	const struct platform_device_id *id = platform_get_device_id(pdev);
	char *dash;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
	snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name);
	dash = strchr(priv->name, '-');
	if (dash)
	*dash = '\0';

	platform_set_drvdata(pdev, priv);

	/* Register sysfs hooks */
	ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base);
	if (ret)
	return ret;

	if (id->driver_data & MC13783_ADC_16CHANS) {
	ret = sysfs_create_group(&pdev->dev.kobj,
	&mc13783_group_16chans);
	if (ret)
	goto out_err_create_16chans;
	}

	if (!mc13783_adc_use_touchscreen(pdev)) {
	ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
	if (ret)
	goto out_err_create_ts;
	}

	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 (!mc13783_adc_use_touchscreen(pdev))
	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
	out_err_create_ts:

	if (id->driver_data & MC13783_ADC_16CHANS)
	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
	out_err_create_16chans:

	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
	return ret;
	}

	static int mc13783_adc_remove(struct platform_device *pdev)
	{
	struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
	kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;

	hwmon_device_unregister(priv->hwmon_dev);

	if (!mc13783_adc_use_touchscreen(pdev))
	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);

	if (driver_data & MC13783_ADC_16CHANS)
	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);

	sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);

	return 0;
	}

	static const struct platform_device_id mc13783_adc_idtable[] = {
	{
	.name = "mc13783-adc",
	.driver_data = MC13783_ADC_16CHANS,
	}, {
	.name = "mc13892-adc",
	.driver_data = MC13783_ADC_BPDIV2,
	}, {
	/* sentinel */
	}
	};
	MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable);

	static struct platform_driver mc13783_adc_driver = {
	.remove = mc13783_adc_remove,
	.driver = {
	.name = DRIVER_NAME,
	},
	.id_table = mc13783_adc_idtable,
	};

	module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe);

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