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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-25 10:50:03 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-25 10:50:03 -0700
commitef994fda44d6b55ffef7bfdf06f645ff2ab1ab1a (patch)
tree564a62822ebb1f6f7e1f86b0eefc34bc769dff7d /drivers/hwmon
parent25eeb667599b192ea850a062d69383ee864c06ab (diff)
parent51b53dc991ae7eebc5d45b06d576da6486fbf823 (diff)
downloadblackbird-op-linux-ef994fda44d6b55ffef7bfdf06f645ff2ab1ab1a.tar.gz
blackbird-op-linux-ef994fda44d6b55ffef7bfdf06f645ff2ab1ab1a.zip
Merge tag 'iio-for-3.10a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes: First set of IIO new drivers and cleanup for the 3.10 cycle. New stuff 1) Add OF support for specifying mappings between iio devices and their in kernel consumers. 2) Driver for AD7923 (extra functionality and support for ad7904, ad7914 and ad7924 added later in series) 3) Driver for Exynos adc (dt suppor for phy added later in series). 4) Make iio_push_event save IRQ context - necessary if it is to be used within an interrupt handler. Users of this functionality to follow. 5) For iio use the device tree node name to provide the hwmon name attribute if available. Removal and moves out of staging 1) Drop the adt7410 driver from IIO now that there is a hmwon driver with equivalent support. This device is very much targeted at hardware monitoring so hwmon is a more appropriate host for the driver. 2) Move iio_hwmon driver to drivers/hwmon. Cleanups 1) Minor cleanup in ST common library. 2) Large set of patches to break the info_mask element which previously used odd and even bits to specify if a channel attribute was either shared across similar channels or specific to only one. Now we have two bitmaps, one for those parameters that are specific to this channel and one for those shared by all channels with the same type as this one. This has no effect on the userspace abi. It simplifies the core code and provides more space for new channel parameters. It has been on the todo list for a long time! Conflicts: drivers/iio/dac/ad5064.c
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/Kconfig9
-rw-r--r--drivers/hwmon/Makefile1
-rw-r--r--drivers/hwmon/iio_hwmon.c196
3 files changed, 206 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 89ac1cb26f24..effbd11ff5ec 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -499,6 +499,15 @@ config SENSORS_IBMPEX
This driver can also be built as a module. If so, the module
will be called ibmpex.
+config SENSORS_IIO_HWMON
+ tristate "Hwmon driver that uses channels specified via iio maps"
+ depends on IIO
+ help
+ This is a platform driver that in combination with a suitable
+ map allows IIO devices to provide basic hwmon functionality
+ for those channels specified in the map. This map can be provided
+ either via platform data or the device tree bindings.
+
config SENSORS_IT87
tristate "ITE IT87xx and compatibles"
depends on !PPC
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 8d6d97ea7c1e..a87fdabddfff 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
+obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o
obj-$(CONFIG_SENSORS_INA209) += ina209.o
obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o
obj-$(CONFIG_SENSORS_IT87) += it87.o
diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c
new file mode 100644
index 000000000000..aafa4531b961
--- /dev/null
+++ b/drivers/hwmon/iio_hwmon.c
@@ -0,0 +1,196 @@
+/* Hwmon client for industrial I/O devices
+ *
+ * Copyright (c) 2011 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+#include <linux/of.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)
+ * @hwmon_dev: associated hwmon device
+ * @attr_group: the group of attributes
+ * @attrs: null terminated array of attribute pointers.
+ */
+struct iio_hwmon_state {
+ struct iio_channel *channels;
+ int num_channels;
+ struct device *hwmon_dev;
+ struct attribute_group attr_group;
+ struct attribute **attrs;
+};
+
+/*
+ * 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);
+
+ ret = iio_read_channel_processed(&state->channels[sattr->index],
+ &result);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", result);
+}
+
+static ssize_t show_name(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ const char *name = "iio_hwmon";
+
+ if (dev->of_node && dev->of_node->name)
+ name = dev->of_node->name;
+
+ return sprintf(buf, "%s\n", name);
+}
+
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+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;
+ int in_i = 1, temp_i = 1, curr_i = 1;
+ enum iio_chan_type type;
+ struct iio_channel *channels;
+
+ channels = iio_channel_get_all(dev);
+ if (IS_ERR(channels))
+ return PTR_ERR(channels);
+
+ st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
+ if (st == NULL)
+ return -ENOMEM;
+
+ st->channels = channels;
+
+ /* count how many attributes we have */
+ while (st->channels[st->num_channels].indio_dev)
+ st->num_channels++;
+
+ st->attrs = devm_kzalloc(dev,
+ sizeof(*st->attrs) * (st->num_channels + 2),
+ GFP_KERNEL);
+ if (st->attrs == NULL) {
+ ret = -ENOMEM;
+ goto error_release_channels;
+ }
+
+ for (i = 0; i < st->num_channels; i++) {
+ a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
+ if (a == NULL) {
+ ret = -ENOMEM;
+ goto error_release_channels;
+ }
+
+ sysfs_attr_init(&a->dev_attr.attr);
+ ret = iio_get_channel_type(&st->channels[i], &type);
+ if (ret < 0)
+ goto error_release_channels;
+
+ switch (type) {
+ case IIO_VOLTAGE:
+ a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+ "in%d_input",
+ in_i++);
+ break;
+ case IIO_TEMP:
+ a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+ "temp%d_input",
+ temp_i++);
+ break;
+ case IIO_CURRENT:
+ a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+ "curr%d_input",
+ curr_i++);
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_release_channels;
+ }
+ if (a->dev_attr.attr.name == NULL) {
+ ret = -ENOMEM;
+ goto error_release_channels;
+ }
+ a->dev_attr.show = iio_hwmon_read_val;
+ a->dev_attr.attr.mode = S_IRUGO;
+ a->index = i;
+ st->attrs[i] = &a->dev_attr.attr;
+ }
+ st->attrs[st->num_channels] = &dev_attr_name.attr;
+ st->attr_group.attrs = st->attrs;
+ platform_set_drvdata(pdev, st);
+ ret = sysfs_create_group(&dev->kobj, &st->attr_group);
+ if (ret < 0)
+ goto error_release_channels;
+
+ st->hwmon_dev = hwmon_device_register(dev);
+ if (IS_ERR(st->hwmon_dev)) {
+ ret = PTR_ERR(st->hwmon_dev);
+ goto error_remove_group;
+ }
+ return 0;
+
+error_remove_group:
+ sysfs_remove_group(&dev->kobj, &st->attr_group);
+error_release_channels:
+ iio_channel_release_all(st->channels);
+ return ret;
+}
+
+static int iio_hwmon_remove(struct platform_device *pdev)
+{
+ struct iio_hwmon_state *st = platform_get_drvdata(pdev);
+
+ hwmon_device_unregister(st->hwmon_dev);
+ sysfs_remove_group(&pdev->dev.kobj, &st->attr_group);
+ iio_channel_release_all(st->channels);
+
+ return 0;
+}
+
+static struct of_device_id iio_hwmon_of_match[] = {
+ { .compatible = "iio-hwmon", },
+ { }
+};
+
+static struct platform_driver __refdata iio_hwmon_driver = {
+ .driver = {
+ .name = "iio_hwmon",
+ .owner = THIS_MODULE,
+ .of_match_table = iio_hwmon_of_match,
+ },
+ .probe = iio_hwmon_probe,
+ .remove = iio_hwmon_remove,
+};
+
+module_platform_driver(iio_hwmon_driver);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
+MODULE_DESCRIPTION("IIO to hwmon driver");
+MODULE_LICENSE("GPL v2");
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