2012-02-15 12:48:03 -07:00
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/* Hwmon client for industrial I/O devices
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*
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* Copyright (c) 2011 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/hwmon.h>
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2013-03-20 09:52:00 -06:00
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#include <linux/of.h>
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2012-02-15 12:48:03 -07:00
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#include <linux/hwmon-sysfs.h>
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2012-04-25 08:54:58 -06:00
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#include <linux/iio/consumer.h>
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#include <linux/iio/types.h>
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2012-02-15 12:48:03 -07:00
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/**
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* struct iio_hwmon_state - device instance state
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* @channels: filled with array of channels from iio
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* @num_channels: number of channels in channels (saves counting twice)
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* @hwmon_dev: associated hwmon device
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* @attr_group: the group of attributes
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* @attrs: null terminated array of attribute pointers.
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*/
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struct iio_hwmon_state {
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struct iio_channel *channels;
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int num_channels;
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struct device *hwmon_dev;
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struct attribute_group attr_group;
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struct attribute **attrs;
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};
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/*
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* Assumes that IIO and hwmon operate in the same base units.
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* This is supposed to be true, but needs verification for
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* new channel types.
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*/
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static ssize_t iio_hwmon_read_val(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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2012-09-17 06:17:00 -06:00
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int result;
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int ret;
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2012-02-15 12:48:03 -07:00
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struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
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struct iio_hwmon_state *state = dev_get_drvdata(dev);
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2012-09-17 06:17:00 -06:00
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ret = iio_read_channel_processed(&state->channels[sattr->index],
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&result);
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2012-02-15 12:48:03 -07:00
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if (ret < 0)
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return ret;
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2012-09-17 06:17:00 -06:00
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return sprintf(buf, "%d\n", result);
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2012-02-15 12:48:03 -07:00
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}
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2013-01-31 14:42:00 -07:00
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static ssize_t show_name(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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2013-03-20 09:52:00 -06:00
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const char *name = "iio_hwmon";
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if (dev->of_node && dev->of_node->name)
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name = dev->of_node->name;
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return sprintf(buf, "%s\n", name);
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2013-01-31 14:42:00 -07:00
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}
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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2012-11-19 11:21:57 -07:00
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static int iio_hwmon_probe(struct platform_device *pdev)
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2012-02-15 12:48:03 -07:00
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{
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2013-01-31 14:42:00 -07:00
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struct device *dev = &pdev->dev;
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2012-02-15 12:48:03 -07:00
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struct iio_hwmon_state *st;
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struct sensor_device_attribute *a;
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int ret, i;
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int in_i = 1, temp_i = 1, curr_i = 1;
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enum iio_chan_type type;
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2013-01-31 14:43:00 -07:00
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struct iio_channel *channels;
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channels = iio_channel_get_all(dev);
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if (IS_ERR(channels))
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return PTR_ERR(channels);
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2012-02-15 12:48:03 -07:00
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2013-01-31 14:42:00 -07:00
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st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
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2013-04-23 11:06:43 -06:00
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if (st == NULL) {
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ret = -ENOMEM;
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goto error_release_channels;
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}
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2012-02-15 12:48:03 -07:00
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2013-01-31 14:43:00 -07:00
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st->channels = channels;
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2012-02-15 12:48:03 -07:00
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/* count how many attributes we have */
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while (st->channels[st->num_channels].indio_dev)
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st->num_channels++;
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2013-01-31 14:42:00 -07:00
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st->attrs = devm_kzalloc(dev,
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2013-01-31 14:42:00 -07:00
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sizeof(*st->attrs) * (st->num_channels + 2),
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2013-01-31 14:42:00 -07:00
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GFP_KERNEL);
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2012-02-15 12:48:03 -07:00
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if (st->attrs == NULL) {
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ret = -ENOMEM;
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goto error_release_channels;
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}
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2013-01-31 14:42:00 -07:00
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2012-02-15 12:48:03 -07:00
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for (i = 0; i < st->num_channels; i++) {
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2013-01-31 14:42:00 -07:00
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a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
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2012-02-15 12:48:03 -07:00
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if (a == NULL) {
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ret = -ENOMEM;
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2013-01-31 14:42:00 -07:00
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goto error_release_channels;
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2012-02-15 12:48:03 -07:00
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}
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sysfs_attr_init(&a->dev_attr.attr);
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2012-05-01 14:04:24 -06:00
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ret = iio_get_channel_type(&st->channels[i], &type);
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2013-01-31 14:42:00 -07:00
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if (ret < 0)
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goto error_release_channels;
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2012-02-15 12:48:03 -07:00
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switch (type) {
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case IIO_VOLTAGE:
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a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
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"in%d_input",
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in_i++);
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break;
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case IIO_TEMP:
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a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
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"temp%d_input",
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temp_i++);
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break;
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case IIO_CURRENT:
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a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
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"curr%d_input",
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curr_i++);
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break;
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default:
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ret = -EINVAL;
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2013-01-31 14:42:00 -07:00
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goto error_release_channels;
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2012-02-15 12:48:03 -07:00
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}
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if (a->dev_attr.attr.name == NULL) {
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ret = -ENOMEM;
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2013-01-31 14:42:00 -07:00
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goto error_release_channels;
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2012-02-15 12:48:03 -07:00
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}
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a->dev_attr.show = iio_hwmon_read_val;
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a->dev_attr.attr.mode = S_IRUGO;
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a->index = i;
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st->attrs[i] = &a->dev_attr.attr;
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}
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2013-01-31 14:42:00 -07:00
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st->attrs[st->num_channels] = &dev_attr_name.attr;
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2012-02-15 12:48:03 -07:00
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st->attr_group.attrs = st->attrs;
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platform_set_drvdata(pdev, st);
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2013-01-31 14:42:00 -07:00
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ret = sysfs_create_group(&dev->kobj, &st->attr_group);
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2012-02-15 12:48:03 -07:00
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if (ret < 0)
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2013-01-31 14:42:00 -07:00
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goto error_release_channels;
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2012-02-15 12:48:03 -07:00
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2013-01-31 14:42:00 -07:00
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st->hwmon_dev = hwmon_device_register(dev);
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2012-02-15 12:48:03 -07:00
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if (IS_ERR(st->hwmon_dev)) {
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ret = PTR_ERR(st->hwmon_dev);
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goto error_remove_group;
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}
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return 0;
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error_remove_group:
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2013-01-31 14:42:00 -07:00
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sysfs_remove_group(&dev->kobj, &st->attr_group);
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2012-02-15 12:48:03 -07:00
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error_release_channels:
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2013-05-13 07:37:26 -06:00
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iio_channel_release_all(channels);
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2012-02-15 12:48:03 -07:00
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return ret;
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}
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2012-11-19 11:26:37 -07:00
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static int iio_hwmon_remove(struct platform_device *pdev)
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2012-02-15 12:48:03 -07:00
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{
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struct iio_hwmon_state *st = platform_get_drvdata(pdev);
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hwmon_device_unregister(st->hwmon_dev);
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sysfs_remove_group(&pdev->dev.kobj, &st->attr_group);
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2012-05-01 14:04:24 -06:00
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iio_channel_release_all(st->channels);
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2012-02-15 12:48:03 -07:00
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return 0;
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}
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2013-01-31 14:43:00 -07:00
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static struct of_device_id iio_hwmon_of_match[] = {
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{ .compatible = "iio-hwmon", },
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{ }
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};
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2013-06-10 09:47:45 -06:00
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MODULE_DEVICE_TABLE(of, iio_hwmon_of_match);
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2013-01-31 14:43:00 -07:00
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2012-02-15 12:48:03 -07:00
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static struct platform_driver __refdata iio_hwmon_driver = {
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.driver = {
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.name = "iio_hwmon",
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.owner = THIS_MODULE,
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2013-01-31 14:43:00 -07:00
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.of_match_table = iio_hwmon_of_match,
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2012-02-15 12:48:03 -07:00
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},
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.probe = iio_hwmon_probe,
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2012-11-19 11:21:38 -07:00
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.remove = iio_hwmon_remove,
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2012-02-15 12:48:03 -07:00
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};
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2012-07-21 02:54:00 -06:00
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module_platform_driver(iio_hwmon_driver);
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2012-02-15 12:48:03 -07:00
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2012-09-02 14:34:59 -06:00
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MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
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2012-02-15 12:48:03 -07:00
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MODULE_DESCRIPTION("IIO to hwmon driver");
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MODULE_LICENSE("GPL v2");
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