Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 1 | /* Hwmon client for industrial I/O devices |
| 2 | * |
| 3 | * Copyright (c) 2011 Jonathan Cameron |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 as published by |
| 7 | * the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/err.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/hwmon.h> |
Guenter Roeck | 3465a22 | 2013-03-20 15:52:00 +0000 | [diff] [blame] | 16 | #include <linux/of.h> |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 17 | #include <linux/hwmon-sysfs.h> |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 18 | #include <linux/iio/consumer.h> |
| 19 | #include <linux/iio/types.h> |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 20 | |
| 21 | /** |
| 22 | * struct iio_hwmon_state - device instance state |
| 23 | * @channels: filled with array of channels from iio |
| 24 | * @num_channels: number of channels in channels (saves counting twice) |
| 25 | * @hwmon_dev: associated hwmon device |
| 26 | * @attr_group: the group of attributes |
| 27 | * @attrs: null terminated array of attribute pointers. |
| 28 | */ |
| 29 | struct iio_hwmon_state { |
| 30 | struct iio_channel *channels; |
| 31 | int num_channels; |
| 32 | struct device *hwmon_dev; |
| 33 | struct attribute_group attr_group; |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 34 | const struct attribute_group *groups[2]; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 35 | struct attribute **attrs; |
| 36 | }; |
| 37 | |
| 38 | /* |
| 39 | * Assumes that IIO and hwmon operate in the same base units. |
| 40 | * This is supposed to be true, but needs verification for |
| 41 | * new channel types. |
| 42 | */ |
| 43 | static ssize_t iio_hwmon_read_val(struct device *dev, |
| 44 | struct device_attribute *attr, |
| 45 | char *buf) |
| 46 | { |
Lars-Peter Clausen | a0e545e | 2012-09-17 13:17:00 +0100 | [diff] [blame] | 47 | int result; |
| 48 | int ret; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 49 | struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr); |
| 50 | struct iio_hwmon_state *state = dev_get_drvdata(dev); |
| 51 | |
Lars-Peter Clausen | a0e545e | 2012-09-17 13:17:00 +0100 | [diff] [blame] | 52 | ret = iio_read_channel_processed(&state->channels[sattr->index], |
| 53 | &result); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 54 | if (ret < 0) |
| 55 | return ret; |
| 56 | |
Lars-Peter Clausen | a0e545e | 2012-09-17 13:17:00 +0100 | [diff] [blame] | 57 | return sprintf(buf, "%d\n", result); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 58 | } |
| 59 | |
Bill Pemberton | 4ae1c61 | 2012-11-19 13:21:57 -0500 | [diff] [blame] | 60 | static int iio_hwmon_probe(struct platform_device *pdev) |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 61 | { |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 62 | struct device *dev = &pdev->dev; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 63 | struct iio_hwmon_state *st; |
| 64 | struct sensor_device_attribute *a; |
| 65 | int ret, i; |
Guenter Roeck | 61bb53b | 2014-09-27 08:31:12 -0700 | [diff] [blame] | 66 | int in_i = 1, temp_i = 1, curr_i = 1, humidity_i = 1; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 67 | enum iio_chan_type type; |
Guenter Roeck | ca7d98d | 2013-01-31 21:43:00 +0000 | [diff] [blame] | 68 | struct iio_channel *channels; |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 69 | const char *name = "iio_hwmon"; |
Sanchayan Maity | b92fe9e | 2016-02-16 10:30:53 +0530 | [diff] [blame] | 70 | char *sname; |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 71 | |
| 72 | if (dev->of_node && dev->of_node->name) |
| 73 | name = dev->of_node->name; |
Guenter Roeck | ca7d98d | 2013-01-31 21:43:00 +0000 | [diff] [blame] | 74 | |
| 75 | channels = iio_channel_get_all(dev); |
| 76 | if (IS_ERR(channels)) |
| 77 | return PTR_ERR(channels); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 78 | |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 79 | st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL); |
Axel Lin | 4510d19 | 2013-04-23 17:06:43 +0000 | [diff] [blame] | 80 | if (st == NULL) { |
| 81 | ret = -ENOMEM; |
| 82 | goto error_release_channels; |
| 83 | } |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 84 | |
Guenter Roeck | ca7d98d | 2013-01-31 21:43:00 +0000 | [diff] [blame] | 85 | st->channels = channels; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 86 | |
| 87 | /* count how many attributes we have */ |
| 88 | while (st->channels[st->num_channels].indio_dev) |
| 89 | st->num_channels++; |
| 90 | |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 91 | st->attrs = devm_kzalloc(dev, |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 92 | sizeof(*st->attrs) * (st->num_channels + 1), |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 93 | GFP_KERNEL); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 94 | if (st->attrs == NULL) { |
| 95 | ret = -ENOMEM; |
| 96 | goto error_release_channels; |
| 97 | } |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 98 | |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 99 | for (i = 0; i < st->num_channels; i++) { |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 100 | a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 101 | if (a == NULL) { |
| 102 | ret = -ENOMEM; |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 103 | goto error_release_channels; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | sysfs_attr_init(&a->dev_attr.attr); |
Jonathan Cameron | 314be14 | 2012-05-01 21:04:24 +0100 | [diff] [blame] | 107 | ret = iio_get_channel_type(&st->channels[i], &type); |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 108 | if (ret < 0) |
| 109 | goto error_release_channels; |
| 110 | |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 111 | switch (type) { |
| 112 | case IIO_VOLTAGE: |
Quentin Schulz | 5d17d3b | 2016-07-26 09:47:09 +0200 | [diff] [blame] | 113 | a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL, |
| 114 | "in%d_input", |
| 115 | in_i++); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 116 | break; |
| 117 | case IIO_TEMP: |
Quentin Schulz | 5d17d3b | 2016-07-26 09:47:09 +0200 | [diff] [blame] | 118 | a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL, |
| 119 | "temp%d_input", |
| 120 | temp_i++); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 121 | break; |
| 122 | case IIO_CURRENT: |
Quentin Schulz | 5d17d3b | 2016-07-26 09:47:09 +0200 | [diff] [blame] | 123 | a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL, |
| 124 | "curr%d_input", |
| 125 | curr_i++); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 126 | break; |
Guenter Roeck | 61bb53b | 2014-09-27 08:31:12 -0700 | [diff] [blame] | 127 | case IIO_HUMIDITYRELATIVE: |
Quentin Schulz | 5d17d3b | 2016-07-26 09:47:09 +0200 | [diff] [blame] | 128 | a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL, |
| 129 | "humidity%d_input", |
| 130 | humidity_i++); |
Guenter Roeck | 61bb53b | 2014-09-27 08:31:12 -0700 | [diff] [blame] | 131 | break; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 132 | default: |
| 133 | ret = -EINVAL; |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 134 | goto error_release_channels; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 135 | } |
| 136 | if (a->dev_attr.attr.name == NULL) { |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 137 | ret = -ENOMEM; |
Guenter Roeck | c4ac7b9 | 2013-01-31 21:42:00 +0000 | [diff] [blame] | 138 | goto error_release_channels; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 139 | } |
| 140 | a->dev_attr.show = iio_hwmon_read_val; |
| 141 | a->dev_attr.attr.mode = S_IRUGO; |
| 142 | a->index = i; |
| 143 | st->attrs[i] = &a->dev_attr.attr; |
| 144 | } |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 145 | |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 146 | st->attr_group.attrs = st->attrs; |
| 147 | st->groups[0] = &st->attr_group; |
Sanchayan Maity | b92fe9e | 2016-02-16 10:30:53 +0530 | [diff] [blame] | 148 | |
| 149 | sname = devm_kstrdup(dev, name, GFP_KERNEL); |
| 150 | if (!sname) { |
| 151 | ret = -ENOMEM; |
| 152 | goto error_release_channels; |
| 153 | } |
| 154 | |
| 155 | strreplace(sname, '-', '_'); |
| 156 | st->hwmon_dev = hwmon_device_register_with_groups(dev, sname, st, |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 157 | st->groups); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 158 | if (IS_ERR(st->hwmon_dev)) { |
| 159 | ret = PTR_ERR(st->hwmon_dev); |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 160 | goto error_release_channels; |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 161 | } |
Guenter Roeck | 4b49cca | 2013-12-01 19:33:16 -0800 | [diff] [blame] | 162 | platform_set_drvdata(pdev, st); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 163 | return 0; |
| 164 | |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 165 | error_release_channels: |
Axel Lin | 159c8cd | 2013-05-13 21:37:26 +0800 | [diff] [blame] | 166 | iio_channel_release_all(channels); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 167 | return ret; |
| 168 | } |
| 169 | |
Bill Pemberton | 447d4f2 | 2012-11-19 13:26:37 -0500 | [diff] [blame] | 170 | static int iio_hwmon_remove(struct platform_device *pdev) |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 171 | { |
| 172 | struct iio_hwmon_state *st = platform_get_drvdata(pdev); |
| 173 | |
| 174 | hwmon_device_unregister(st->hwmon_dev); |
Jonathan Cameron | 314be14 | 2012-05-01 21:04:24 +0100 | [diff] [blame] | 175 | iio_channel_release_all(st->channels); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 176 | |
| 177 | return 0; |
| 178 | } |
| 179 | |
Jingoo Han | cfe03d6 | 2014-05-07 17:29:02 +0900 | [diff] [blame] | 180 | static const struct of_device_id iio_hwmon_of_match[] = { |
Guenter Roeck | a11e619 | 2013-01-31 21:43:00 +0000 | [diff] [blame] | 181 | { .compatible = "iio-hwmon", }, |
| 182 | { } |
| 183 | }; |
Sebastian Andrzej Siewior | 2ec2819 | 2013-06-10 17:47:45 +0200 | [diff] [blame] | 184 | MODULE_DEVICE_TABLE(of, iio_hwmon_of_match); |
Guenter Roeck | a11e619 | 2013-01-31 21:43:00 +0000 | [diff] [blame] | 185 | |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 186 | static struct platform_driver __refdata iio_hwmon_driver = { |
| 187 | .driver = { |
| 188 | .name = "iio_hwmon", |
Guenter Roeck | a11e619 | 2013-01-31 21:43:00 +0000 | [diff] [blame] | 189 | .of_match_table = iio_hwmon_of_match, |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 190 | }, |
| 191 | .probe = iio_hwmon_probe, |
Bill Pemberton | e543acf | 2012-11-19 13:21:38 -0500 | [diff] [blame] | 192 | .remove = iio_hwmon_remove, |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 193 | }; |
| 194 | |
Devendra Naga | d16f6db | 2012-07-21 09:54:00 +0100 | [diff] [blame] | 195 | module_platform_driver(iio_hwmon_driver); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 196 | |
Jonathan Cameron | 0f8c962 | 2012-09-02 21:34:59 +0100 | [diff] [blame] | 197 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
Jonathan Cameron | e0f8a24 | 2012-02-15 19:48:03 +0000 | [diff] [blame] | 198 | MODULE_DESCRIPTION("IIO to hwmon driver"); |
| 199 | MODULE_LICENSE("GPL v2"); |