^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Hwmon client for industrial I/O devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2011 Jonathan Cameron
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/hwmon-sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/iio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/iio/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * struct iio_hwmon_state - device instance state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * @channels: filled with array of channels from iio
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * @num_channels: number of channels in channels (saves counting twice)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * @attr_group: the group of attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * @groups: null terminated array of attribute groups
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * @attrs: null terminated array of attribute pointers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct iio_hwmon_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct iio_channel *channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) int num_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct attribute_group attr_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) const struct attribute_group *groups[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct attribute **attrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * Assumes that IIO and hwmon operate in the same base units.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * This is supposed to be true, but needs verification for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * new channel types.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static ssize_t iio_hwmon_read_val(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct iio_hwmon_state *state = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct iio_channel *chan = &state->channels[sattr->index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) enum iio_chan_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ret = iio_read_channel_processed(chan, &result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ret = iio_get_channel_type(chan, &type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (type == IIO_POWER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) result *= 1000; /* mili-Watts to micro-Watts conversion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return sprintf(buf, "%d\n", result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int iio_hwmon_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct iio_hwmon_state *st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct sensor_device_attribute *a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int ret, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1, power_i = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) enum iio_chan_type type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct iio_channel *channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) char *sname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) channels = devm_iio_channel_get_all(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (IS_ERR(channels)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (PTR_ERR(channels) == -ENODEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return PTR_ERR(channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (st == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) st->channels = channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /* count how many attributes we have */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) while (st->channels[st->num_channels].indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) st->num_channels++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) st->attrs = devm_kcalloc(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) st->num_channels + 1, sizeof(*st->attrs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (st->attrs == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) for (i = 0; i < st->num_channels; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) const char *prefix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (a == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) sysfs_attr_init(&a->dev_attr.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ret = iio_get_channel_type(&st->channels[i], &type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) case IIO_VOLTAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) n = in_i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) prefix = "in";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) case IIO_TEMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) n = temp_i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) prefix = "temp";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) case IIO_CURRENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) n = curr_i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) prefix = "curr";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) case IIO_POWER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) n = power_i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) prefix = "power";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) case IIO_HUMIDITYRELATIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) n = humidity_i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) prefix = "humidity";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) "%s%d_input",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) prefix, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (a->dev_attr.attr.name == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) a->dev_attr.show = iio_hwmon_read_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) a->dev_attr.attr.mode = 0444;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) a->index = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) st->attrs[i] = &a->dev_attr.attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) st->attr_group.attrs = st->attrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) st->groups[0] = &st->attr_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (dev->of_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) sname = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (!sname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) strreplace(sname, '-', '_');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) sname = "iio_hwmon";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) st->groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return PTR_ERR_OR_ZERO(hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static const struct of_device_id iio_hwmon_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) { .compatible = "iio-hwmon", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_DEVICE_TABLE(of, iio_hwmon_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static struct platform_driver __refdata iio_hwmon_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) .name = "iio_hwmon",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) .of_match_table = iio_hwmon_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) .probe = iio_hwmon_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) module_platform_driver(iio_hwmon_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) MODULE_DESCRIPTION("IIO to hwmon driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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