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![Sanchayan Maity](/assets/img/avatar_default.png)
Currently the driver calls hwmon_device_register_with_groups which does not accept hypen in node name and returns EINVAL. Use of hypen in device tree node name results in probe failure., however use of hypen in device tree node name is perfectly acceptable. Change this by allocating a duplicate managed string, replacing hypen with underscore and then calling hwmon_device_register_with_groups. This allows the use of hypen in device tree node name while maintaining backwards compatibility and preventing any possible regressions with user space. Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
199 lines
4.8 KiB
C
199 lines
4.8 KiB
C
/* 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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#include <linux/of.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/iio/consumer.h>
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#include <linux/iio/types.h>
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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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const struct attribute_group *groups[2];
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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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int result;
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int ret;
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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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ret = iio_read_channel_processed(&state->channels[sattr->index],
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&result);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", result);
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}
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static int iio_hwmon_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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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, humidity_i = 1;
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enum iio_chan_type type;
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struct iio_channel *channels;
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const char *name = "iio_hwmon";
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char *sname;
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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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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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st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
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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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st->channels = channels;
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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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st->attrs = devm_kzalloc(dev,
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sizeof(*st->attrs) * (st->num_channels + 1),
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GFP_KERNEL);
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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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for (i = 0; i < st->num_channels; i++) {
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a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
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if (a == NULL) {
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ret = -ENOMEM;
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goto error_release_channels;
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}
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sysfs_attr_init(&a->dev_attr.attr);
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ret = iio_get_channel_type(&st->channels[i], &type);
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if (ret < 0)
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goto error_release_channels;
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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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case IIO_HUMIDITYRELATIVE:
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a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
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"humidity%d_input",
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humidity_i++);
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break;
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default:
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ret = -EINVAL;
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goto error_release_channels;
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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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goto error_release_channels;
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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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st->attr_group.attrs = st->attrs;
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st->groups[0] = &st->attr_group;
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sname = devm_kstrdup(dev, name, GFP_KERNEL);
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if (!sname) {
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ret = -ENOMEM;
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goto error_release_channels;
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}
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strreplace(sname, '-', '_');
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st->hwmon_dev = hwmon_device_register_with_groups(dev, sname, st,
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st->groups);
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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_release_channels;
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}
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platform_set_drvdata(pdev, st);
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return 0;
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error_release_channels:
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iio_channel_release_all(channels);
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return ret;
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}
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static int iio_hwmon_remove(struct platform_device *pdev)
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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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iio_channel_release_all(st->channels);
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return 0;
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}
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static const 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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MODULE_DEVICE_TABLE(of, iio_hwmon_of_match);
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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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.of_match_table = iio_hwmon_of_match,
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},
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.probe = iio_hwmon_probe,
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.remove = iio_hwmon_remove,
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};
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module_platform_driver(iio_hwmon_driver);
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MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
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MODULE_DESCRIPTION("IIO to hwmon driver");
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MODULE_LICENSE("GPL v2");
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