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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e0f8a24e JC |
2 | /* Hwmon client for industrial I/O devices |
3 | * | |
4 | * Copyright (c) 2011 Jonathan Cameron | |
e0f8a24e JC |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/err.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/hwmon.h> | |
3465a224 | 13 | #include <linux/of.h> |
e0f8a24e | 14 | #include <linux/hwmon-sysfs.h> |
06458e27 JC |
15 | #include <linux/iio/consumer.h> |
16 | #include <linux/iio/types.h> | |
e0f8a24e JC |
17 | |
18 | /** | |
19 | * struct iio_hwmon_state - device instance state | |
20 | * @channels: filled with array of channels from iio | |
21 | * @num_channels: number of channels in channels (saves counting twice) | |
7f6d70cd GR |
22 | * @attr_group: the group of attributes |
23 | * @groups: null terminated array of attribute groups | |
e0f8a24e JC |
24 | * @attrs: null terminated array of attribute pointers. |
25 | */ | |
26 | struct iio_hwmon_state { | |
27 | struct iio_channel *channels; | |
28 | int num_channels; | |
e0f8a24e | 29 | struct attribute_group attr_group; |
4b49cca3 | 30 | const struct attribute_group *groups[2]; |
e0f8a24e JC |
31 | struct attribute **attrs; |
32 | }; | |
33 | ||
34 | /* | |
35 | * Assumes that IIO and hwmon operate in the same base units. | |
36 | * This is supposed to be true, but needs verification for | |
37 | * new channel types. | |
38 | */ | |
39 | static ssize_t iio_hwmon_read_val(struct device *dev, | |
40 | struct device_attribute *attr, | |
41 | char *buf) | |
42 | { | |
a0e545e0 LPC |
43 | int result; |
44 | int ret; | |
e0f8a24e JC |
45 | struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); |
46 | struct iio_hwmon_state *state = dev_get_drvdata(dev); | |
47 | ||
a0e545e0 LPC |
48 | ret = iio_read_channel_processed(&state->channels[sattr->index], |
49 | &result); | |
e0f8a24e JC |
50 | if (ret < 0) |
51 | return ret; | |
52 | ||
a0e545e0 | 53 | return sprintf(buf, "%d\n", result); |
e0f8a24e JC |
54 | } |
55 | ||
4ae1c61f | 56 | static int iio_hwmon_probe(struct platform_device *pdev) |
e0f8a24e | 57 | { |
c4ac7b98 | 58 | struct device *dev = &pdev->dev; |
e0f8a24e JC |
59 | struct iio_hwmon_state *st; |
60 | struct sensor_device_attribute *a; | |
61 | int ret, i; | |
61bb53bc | 62 | int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1; |
e0f8a24e | 63 | enum iio_chan_type type; |
ca7d98db | 64 | struct iio_channel *channels; |
12005ec3 | 65 | struct device *hwmon_dev; |
b92fe9e3 | 66 | char *sname; |
4b49cca3 | 67 | |
12005ec3 | 68 | channels = devm_iio_channel_get_all(dev); |
9417fefe QS |
69 | if (IS_ERR(channels)) { |
70 | if (PTR_ERR(channels) == -ENODEV) | |
71 | return -EPROBE_DEFER; | |
ca7d98db | 72 | return PTR_ERR(channels); |
9417fefe | 73 | } |
e0f8a24e | 74 | |
c4ac7b98 | 75 | st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL); |
12005ec3 MRB |
76 | if (st == NULL) |
77 | return -ENOMEM; | |
e0f8a24e | 78 | |
ca7d98db | 79 | st->channels = channels; |
e0f8a24e JC |
80 | |
81 | /* count how many attributes we have */ | |
82 | while (st->channels[st->num_channels].indio_dev) | |
83 | st->num_channels++; | |
84 | ||
a86854d0 KC |
85 | st->attrs = devm_kcalloc(dev, |
86 | st->num_channels + 1, sizeof(*st->attrs), | |
c4ac7b98 | 87 | GFP_KERNEL); |
12005ec3 MRB |
88 | if (st->attrs == NULL) |
89 | return -ENOMEM; | |
c4ac7b98 | 90 | |
e0f8a24e | 91 | for (i = 0; i < st->num_channels; i++) { |
cb202bb8 AS |
92 | const char *prefix; |
93 | int n; | |
94 | ||
c4ac7b98 | 95 | a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL); |
12005ec3 MRB |
96 | if (a == NULL) |
97 | return -ENOMEM; | |
e0f8a24e JC |
98 | |
99 | sysfs_attr_init(&a->dev_attr.attr); | |
314be14b | 100 | ret = iio_get_channel_type(&st->channels[i], &type); |
c4ac7b98 | 101 | if (ret < 0) |
12005ec3 | 102 | return ret; |
c4ac7b98 | 103 | |
e0f8a24e JC |
104 | switch (type) { |
105 | case IIO_VOLTAGE: | |
cb202bb8 AS |
106 | n = in_i++; |
107 | prefix = "in"; | |
e0f8a24e JC |
108 | break; |
109 | case IIO_TEMP: | |
cb202bb8 AS |
110 | n = temp_i++; |
111 | prefix = "temp"; | |
e0f8a24e JC |
112 | break; |
113 | case IIO_CURRENT: | |
cb202bb8 AS |
114 | n = curr_i++; |
115 | prefix = "curr"; | |
e0f8a24e | 116 | break; |
61bb53bc | 117 | case IIO_HUMIDITYRELATIVE: |
cb202bb8 AS |
118 | n = humidity_i++; |
119 | prefix = "humidity"; | |
61bb53bc | 120 | break; |
e0f8a24e | 121 | default: |
12005ec3 | 122 | return -EINVAL; |
e0f8a24e | 123 | } |
cb202bb8 AS |
124 | |
125 | a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL, | |
126 | "%s%d_input", | |
127 | prefix, n); | |
12005ec3 MRB |
128 | if (a->dev_attr.attr.name == NULL) |
129 | return -ENOMEM; | |
130 | ||
e0f8a24e | 131 | a->dev_attr.show = iio_hwmon_read_val; |
389bc38e | 132 | a->dev_attr.attr.mode = 0444; |
e0f8a24e JC |
133 | a->index = i; |
134 | st->attrs[i] = &a->dev_attr.attr; | |
135 | } | |
e0f8a24e | 136 | |
4b49cca3 GR |
137 | st->attr_group.attrs = st->attrs; |
138 | st->groups[0] = &st->attr_group; | |
b92fe9e3 | 139 | |
86103cff | 140 | if (dev->of_node) { |
0debe4d0 | 141 | sname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node); |
86103cff GR |
142 | if (!sname) |
143 | return -ENOMEM; | |
144 | strreplace(sname, '-', '_'); | |
145 | } else { | |
146 | sname = "iio_hwmon"; | |
147 | } | |
b92fe9e3 | 148 | |
12005ec3 MRB |
149 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st, |
150 | st->groups); | |
151 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
e0f8a24e JC |
152 | } |
153 | ||
cfe03d64 | 154 | static const struct of_device_id iio_hwmon_of_match[] = { |
a11e619b GR |
155 | { .compatible = "iio-hwmon", }, |
156 | { } | |
157 | }; | |
2ec28196 | 158 | MODULE_DEVICE_TABLE(of, iio_hwmon_of_match); |
a11e619b | 159 | |
e0f8a24e JC |
160 | static struct platform_driver __refdata iio_hwmon_driver = { |
161 | .driver = { | |
162 | .name = "iio_hwmon", | |
a11e619b | 163 | .of_match_table = iio_hwmon_of_match, |
e0f8a24e JC |
164 | }, |
165 | .probe = iio_hwmon_probe, | |
e0f8a24e JC |
166 | }; |
167 | ||
d16f6dbd | 168 | module_platform_driver(iio_hwmon_driver); |
e0f8a24e | 169 | |
0f8c9620 | 170 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
e0f8a24e JC |
171 | MODULE_DESCRIPTION("IIO to hwmon driver"); |
172 | MODULE_LICENSE("GPL v2"); |