247 lines
6.8 KiB
C
247 lines
6.8 KiB
C
/*
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* Driver for the Freescale Semiconductor MC13783 adc.
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*
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* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright (C) 2009 Sascha Hauer, Pengutronix
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/mfd/mc13783.h>
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#include <linux/platform_device.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/hwmon.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#define MC13783_ADC_NAME "mc13783-adc"
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struct mc13783_adc_priv {
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struct mc13783 *mc13783;
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struct device *hwmon_dev;
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};
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static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute
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*devattr, char *buf)
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{
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return sprintf(buf, "mc13783_adc\n");
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}
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static int mc13783_adc_read(struct device *dev,
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struct device_attribute *devattr, unsigned int *val)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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unsigned int channel = attr->index;
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unsigned int sample[4];
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int ret;
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ret = mc13783_adc_do_conversion(priv->mc13783,
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MC13783_ADC_MODE_MULT_CHAN,
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channel, sample);
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if (ret)
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return ret;
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channel &= 0x7;
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*val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
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return 0;
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}
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static ssize_t mc13783_adc_read_bp(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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unsigned val;
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int ret = mc13783_adc_read(dev, devattr, &val);
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if (ret)
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return ret;
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/*
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* BP (channel 2) reports with offset 2.4V to the actual value to fit
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* the input range of the ADC. unit = 2.25mV = 9/4 mV.
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*/
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val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;
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return sprintf(buf, "%u\n", val);
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}
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static ssize_t mc13783_adc_read_gp(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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unsigned val;
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int ret = mc13783_adc_read(dev, devattr, &val);
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if (ret)
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return ret;
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/*
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* input range is [0, 2.3V], val has 10 bits, so each bit
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* is worth 9/4 mV.
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*/
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val = DIV_ROUND_CLOSEST(val * 9, 4);
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return sprintf(buf, "%u\n", val);
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}
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static DEVICE_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL);
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static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2);
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static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5);
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static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6);
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static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7);
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static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8);
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static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9);
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static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10);
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static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11);
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static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12);
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static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13);
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static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14);
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static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15);
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static struct attribute *mc13783_attr[] = {
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&dev_attr_name.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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&sensor_dev_attr_in7_input.dev_attr.attr,
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&sensor_dev_attr_in8_input.dev_attr.attr,
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&sensor_dev_attr_in9_input.dev_attr.attr,
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&sensor_dev_attr_in10_input.dev_attr.attr,
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&sensor_dev_attr_in11_input.dev_attr.attr,
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NULL
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};
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static const struct attribute_group mc13783_group = {
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.attrs = mc13783_attr,
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};
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/* last four channels may be occupied by the touchscreen */
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static struct attribute *mc13783_attr_ts[] = {
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&sensor_dev_attr_in12_input.dev_attr.attr,
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&sensor_dev_attr_in13_input.dev_attr.attr,
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&sensor_dev_attr_in14_input.dev_attr.attr,
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&sensor_dev_attr_in15_input.dev_attr.attr,
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NULL
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};
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static const struct attribute_group mc13783_group_ts = {
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.attrs = mc13783_attr_ts,
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};
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static int mc13783_adc_use_touchscreen(struct platform_device *pdev)
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{
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struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
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unsigned flags = mc13783_get_flags(priv->mc13783);
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return flags & MC13783_USE_TOUCHSCREEN;
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}
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static int __init mc13783_adc_probe(struct platform_device *pdev)
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{
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struct mc13783_adc_priv *priv;
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int ret;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
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platform_set_drvdata(pdev, priv);
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/* Register sysfs hooks */
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ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group);
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if (ret)
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goto out_err_create1;
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if (!mc13783_adc_use_touchscreen(pdev)) {
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ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
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if (ret)
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goto out_err_create2;
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}
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priv->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(priv->hwmon_dev)) {
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ret = PTR_ERR(priv->hwmon_dev);
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dev_err(&pdev->dev,
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"hwmon_device_register failed with %d.\n", ret);
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goto out_err_register;
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}
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return 0;
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out_err_register:
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if (!mc13783_adc_use_touchscreen(pdev))
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
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out_err_create2:
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);
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out_err_create1:
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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return ret;
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}
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static int __devexit mc13783_adc_remove(struct platform_device *pdev)
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{
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struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
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hwmon_device_unregister(priv->hwmon_dev);
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if (!mc13783_adc_use_touchscreen(pdev))
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
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sysfs_remove_group(&pdev->dev.kobj, &mc13783_group);
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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return 0;
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}
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static struct platform_driver mc13783_adc_driver = {
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.remove = __devexit_p(mc13783_adc_remove),
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.driver = {
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.owner = THIS_MODULE,
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.name = MC13783_ADC_NAME,
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},
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};
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static int __init mc13783_adc_init(void)
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{
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return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe);
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}
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static void __exit mc13783_adc_exit(void)
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{
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platform_driver_unregister(&mc13783_adc_driver);
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}
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module_init(mc13783_adc_init);
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module_exit(mc13783_adc_exit);
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MODULE_DESCRIPTION("MC13783 ADC driver");
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MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" MC13783_ADC_NAME);
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