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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2017-12-03 16:22:26 -07:00
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* @attr_group: the group of attributes
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* @groups: null terminated array of attribute groups
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2012-02-15 12:48:03 -07:00
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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 attribute_group attr_group;
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2013-12-01 20:33:16 -07:00
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const struct attribute_group *groups[2];
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2012-02-15 12:48:03 -07:00
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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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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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2014-09-27 09:31:12 -06:00
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int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1;
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2012-02-15 12:48:03 -07:00
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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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2018-07-22 21:33:29 -06:00
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struct device *hwmon_dev;
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2016-02-15 22:00:53 -07:00
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char *sname;
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2013-12-01 20:33:16 -07:00
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2018-07-22 21:33:29 -06:00
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channels = devm_iio_channel_get_all(dev);
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2016-09-08 08:28:35 -06:00
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if (IS_ERR(channels)) {
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if (PTR_ERR(channels) == -ENODEV)
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return -EPROBE_DEFER;
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2013-01-31 14:43:00 -07:00
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return PTR_ERR(channels);
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2016-09-08 08:28:35 -06:00
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}
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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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2018-07-22 21:33:29 -06:00
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if (st == NULL)
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return -ENOMEM;
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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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treewide: devm_kzalloc() -> devm_kcalloc()
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:
devm_kzalloc(handle, a * b, gfp)
with:
devm_kcalloc(handle, a * b, gfp)
as well as handling cases of:
devm_kzalloc(handle, a * b * c, gfp)
with:
devm_kzalloc(handle, array3_size(a, b, c), gfp)
as it's slightly less ugly than:
devm_kcalloc(handle, array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
devm_kzalloc(handle, 4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@
(
devm_kzalloc(HANDLE,
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
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devm_kzalloc(HANDLE,
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@
(
devm_kzalloc(HANDLE,
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(u8) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(char) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@
(
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
devm_kzalloc(HANDLE,
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
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devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
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devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * E2
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * (E2)
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 15:07:58 -06:00
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st->attrs = devm_kcalloc(dev,
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st->num_channels + 1, sizeof(*st->attrs),
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2013-01-31 14:42:00 -07:00
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GFP_KERNEL);
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2018-07-22 21:33:29 -06:00
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if (st->attrs == NULL)
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return -ENOMEM;
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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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2018-07-22 21:33:29 -06:00
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if (a == NULL)
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return -ENOMEM;
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2012-02-15 12:48:03 -07:00
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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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2018-07-22 21:33:29 -06:00
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return ret;
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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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switch (type) {
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case IIO_VOLTAGE:
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2016-07-26 01:47:09 -06:00
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a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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"in%d_input",
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in_i++);
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2012-02-15 12:48:03 -07:00
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break;
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case IIO_TEMP:
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2016-07-26 01:47:09 -06:00
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a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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"temp%d_input",
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temp_i++);
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2012-02-15 12:48:03 -07:00
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break;
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case IIO_CURRENT:
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2016-07-26 01:47:09 -06:00
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a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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"curr%d_input",
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curr_i++);
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2012-02-15 12:48:03 -07:00
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break;
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2014-09-27 09:31:12 -06:00
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case IIO_HUMIDITYRELATIVE:
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2016-07-26 01:47:09 -06:00
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a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
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"humidity%d_input",
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humidity_i++);
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2014-09-27 09:31:12 -06:00
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break;
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2012-02-15 12:48:03 -07:00
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default:
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2018-07-22 21:33:29 -06:00
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return -EINVAL;
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2012-02-15 12:48:03 -07:00
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}
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2018-07-22 21:33:29 -06:00
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if (a->dev_attr.attr.name == NULL)
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return -ENOMEM;
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2012-02-15 12:48:03 -07:00
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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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2013-12-01 20:33:16 -07:00
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st->attr_group.attrs = st->attrs;
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st->groups[0] = &st->attr_group;
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2016-02-15 22:00:53 -07:00
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2018-08-27 19:52:21 -06:00
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if (dev->of_node)
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sname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
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else
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sname = devm_kstrdup(dev, "iio_hwmon", GFP_KERNEL);
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2018-07-22 21:33:29 -06:00
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if (!sname)
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return -ENOMEM;
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2016-02-15 22:00:53 -07:00
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strreplace(sname, '-', '_');
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2018-07-22 21:33:29 -06:00
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st,
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st->groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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2012-02-15 12:48:03 -07:00
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}
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2014-05-07 02:29:02 -06:00
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static const struct of_device_id iio_hwmon_of_match[] = {
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2013-01-31 14:43:00 -07:00
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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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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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};
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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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