linux/drivers/hwmon/iio_hwmon.c
Linus Torvalds acc5965b9f Char/Misc and other driver changes for 6.11-rc1
Here is the "big" set of char/misc and other driver subsystem changes
 for 6.11-rc1.  Nothing major in here, just loads of new drivers and
 updates.  Included in here are:
   - IIO api updates and new drivers added
   - wait_interruptable_timeout() api cleanups for some drivers
   - MODULE_DESCRIPTION() additions for loads of drivers
   - parport out-of-bounds fix
   - interconnect driver updates and additions
   - mhi driver updates and additions
   - w1 driver fixes
   - binder speedups and fixes
   - eeprom driver updates
   - coresight driver updates
   - counter driver update
   - new misc driver additions
   - other minor api updates
 
 All of these, EXCEPT for the final Kconfig build fix for 32bit systems,
 have been in linux-next for a while with no reported issues.  The
 Kconfig fixup went in 29 hours ago, so might have missed the latest
 linux-next, but was acked by everyone involved.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char / misc and other driver updates from Greg KH:
 "Here is the "big" set of char/misc and other driver subsystem changes
  for 6.11-rc1. Nothing major in here, just loads of new drivers and
  updates. Included in here are:

   - IIO api updates and new drivers added

   - wait_interruptable_timeout() api cleanups for some drivers

   - MODULE_DESCRIPTION() additions for loads of drivers

   - parport out-of-bounds fix

   - interconnect driver updates and additions

   - mhi driver updates and additions

   - w1 driver fixes

   - binder speedups and fixes

   - eeprom driver updates

   - coresight driver updates

   - counter driver update

   - new misc driver additions

   - other minor api updates

  All of these, EXCEPT for the final Kconfig build fix for 32bit
  systems, have been in linux-next for a while with no reported issues.
  The Kconfig fixup went in 29 hours ago, so might have missed the
  latest linux-next, but was acked by everyone involved"

* tag 'char-misc-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (330 commits)
  misc: Kconfig: exclude mrvl-cn10k-dpi compilation for 32-bit systems
  misc: delete Makefile.rej
  binder: fix hang of unregistered readers
  misc: Kconfig: add a new dependency for MARVELL_CN10K_DPI
  virtio: add missing MODULE_DESCRIPTION() macro
  agp: uninorth: add missing MODULE_DESCRIPTION() macro
  spmi: add missing MODULE_DESCRIPTION() macros
  dev/parport: fix the array out-of-bounds risk
  samples: configfs: add missing MODULE_DESCRIPTION() macro
  misc: mrvl-cn10k-dpi: add Octeon CN10K DPI administrative driver
  misc: keba: Fix missing AUXILIARY_BUS dependency
  slimbus: Fix struct and documentation alignment in stream.c
  MAINTAINERS: CC dri-devel list on Qualcomm FastRPC patches
  misc: fastrpc: use coherent pool for untranslated Compute Banks
  misc: fastrpc: support complete DMA pool access to the DSP
  misc: fastrpc: add missing MODULE_DESCRIPTION() macro
  misc: fastrpc: Add missing dev_err newlines
  misc: fastrpc: Use memdup_user()
  nvmem: core: Implement force_ro sysfs attribute
  nvmem: Use sysfs_emit() for type attribute
  ...
2024-07-19 15:55:08 -07:00

225 lines
5.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/* Hwmon client for industrial I/O devices
*
* Copyright (c) 2011 Jonathan Cameron
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/iio/consumer.h>
#include <linux/iio/types.h>
/**
* struct iio_hwmon_state - device instance state
* @channels: filled with array of channels from iio
* @num_channels: number of channels in channels (saves counting twice)
* @attr_group: the group of attributes
* @groups: null terminated array of attribute groups
* @attrs: null terminated array of attribute pointers.
*/
struct iio_hwmon_state {
struct iio_channel *channels;
int num_channels;
struct attribute_group attr_group;
const struct attribute_group *groups[2];
struct attribute **attrs;
};
static ssize_t iio_hwmon_read_label(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
struct iio_hwmon_state *state = dev_get_drvdata(dev);
struct iio_channel *chan = &state->channels[sattr->index];
return iio_read_channel_label(chan, buf);
}
/*
* Assumes that IIO and hwmon operate in the same base units.
* This is supposed to be true, but needs verification for
* new channel types.
*/
static ssize_t iio_hwmon_read_val(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int result;
int ret;
struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
struct iio_hwmon_state *state = dev_get_drvdata(dev);
struct iio_channel *chan = &state->channels[sattr->index];
enum iio_chan_type type;
ret = iio_get_channel_type(chan, &type);
if (ret < 0)
return ret;
if (type == IIO_POWER)
/* mili-Watts to micro-Watts conversion */
ret = iio_read_channel_processed_scale(chan, &result, 1000);
else
ret = iio_read_channel_processed(chan, &result);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", result);
}
static int iio_hwmon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct iio_hwmon_state *st;
struct sensor_device_attribute *a;
int ret, i, attr = 0;
int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1, power_i = 1;
enum iio_chan_type type;
struct iio_channel *channels;
struct device *hwmon_dev;
char *sname;
void *buf;
channels = devm_iio_channel_get_all(dev);
if (IS_ERR(channels)) {
ret = PTR_ERR(channels);
if (ret == -ENODEV)
ret = -EPROBE_DEFER;
return dev_err_probe(dev, ret,
"Failed to get channels\n");
}
st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
buf = (void *)devm_get_free_pages(dev, GFP_KERNEL, 0);
if (!st || !buf)
return -ENOMEM;
st->channels = channels;
/* count how many channels we have */
while (st->channels[st->num_channels].indio_dev)
st->num_channels++;
st->attrs = devm_kcalloc(dev,
2 * st->num_channels + 1, sizeof(*st->attrs),
GFP_KERNEL);
if (st->attrs == NULL)
return -ENOMEM;
for (i = 0; i < st->num_channels; i++) {
const char *prefix;
int n;
a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
if (a == NULL)
return -ENOMEM;
sysfs_attr_init(&a->dev_attr.attr);
ret = iio_get_channel_type(&st->channels[i], &type);
if (ret < 0)
return ret;
switch (type) {
case IIO_VOLTAGE:
n = in_i++;
prefix = "in";
break;
case IIO_TEMP:
n = temp_i++;
prefix = "temp";
break;
case IIO_CURRENT:
n = curr_i++;
prefix = "curr";
break;
case IIO_POWER:
n = power_i++;
prefix = "power";
break;
case IIO_HUMIDITYRELATIVE:
n = humidity_i++;
prefix = "humidity";
break;
default:
return -EINVAL;
}
a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
"%s%d_input",
prefix, n);
if (a->dev_attr.attr.name == NULL)
return -ENOMEM;
a->dev_attr.show = iio_hwmon_read_val;
a->dev_attr.attr.mode = 0444;
a->index = i;
st->attrs[attr++] = &a->dev_attr.attr;
/* Let's see if we have a label... */
if (iio_read_channel_label(&st->channels[i], buf) < 0)
continue;
a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
if (a == NULL)
return -ENOMEM;
sysfs_attr_init(&a->dev_attr.attr);
a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
"%s%d_label",
prefix, n);
if (!a->dev_attr.attr.name)
return -ENOMEM;
a->dev_attr.show = iio_hwmon_read_label;
a->dev_attr.attr.mode = 0444;
a->index = i;
st->attrs[attr++] = &a->dev_attr.attr;
}
devm_free_pages(dev, (unsigned long)buf);
st->attr_group.attrs = st->attrs;
st->groups[0] = &st->attr_group;
if (dev_fwnode(dev)) {
sname = devm_kasprintf(dev, GFP_KERNEL, "%pfwP", dev_fwnode(dev));
if (!sname)
return -ENOMEM;
strreplace(sname, '-', '_');
} else {
sname = "iio_hwmon";
}
hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st,
st->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct of_device_id iio_hwmon_of_match[] = {
{ .compatible = "iio-hwmon", },
{ }
};
MODULE_DEVICE_TABLE(of, iio_hwmon_of_match);
static struct platform_driver iio_hwmon_driver = {
.driver = {
.name = "iio_hwmon",
.of_match_table = iio_hwmon_of_match,
},
.probe = iio_hwmon_probe,
};
module_platform_driver(iio_hwmon_driver);
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("IIO to hwmon driver");
MODULE_LICENSE("GPL v2");