Merge tag 'staging-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging driver tree update from Greg Kroah-Hartman:
 "Here's the big staging driver tree update for 3.10-rc1

  This update contains loads of comedi driver cleanups and fixes in
  here, iio updates, android driver changes, and other various staging
  driver cleanups.

  Thanks to some drivers being removed, and the comedi driver cleanups,
  we have removed more code than we added:

   627 files changed, 65145 insertions(+), 76321 deletions(-)

  which is always nice to see.

  All of these have been in linux-next for a while."

* tag 'staging-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (940 commits)
  staging: comedi: ni_labpc: fix legacy driver build
  staging: comedi: das800: cleanup the cio-das802/16 fifo comments
  staging: comedi: das800: rename CamelCase vars in das800_ai_do_cmd()
  staging: comedi: das800: tidy up the private data
  staging: comedi: das800: tidy up das800_interrupt()
  staging: comedi: das800: tidy up das800_ai_insn_read()
  staging: comedi: das800: tidy up das800_di_insn_bits()
  staging: comedi: das800: tidy up das800_do_insn_bits()
  staging: comedi: das800: remove extra divisor calculation call
  staging: comedi: das800: rename {enable,disable}_das800
  staging: comedi: das800: tidy up subdevice init
  staging: comedi: das800: allow attaching without interrupt support
  staging: comedi: das800: interrupts are required for async command support
  staging: comedi: das800: tidy up das800_ai_do_cmdtest()
  staging: comedi: das800: remove 'volatile' on private data variables
  staging: comedi: das800: cleanup the boardinfo
  staging: comedi: das800: cleanup range table declarations
  staging: comedi: das800: introduce das800_ind_{write, read}()
  staging: comedi: das800: remove forward declarations
  staging: comedi: das800: move das800_set_frequency()
  ...

3 files changed, 206 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 4f29117651b6..f61d98a62967 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -519,6 +519,15 @@ 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 5c71fe6a9c79..c51b0dc35dc8 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -67,6 +67,7 @@ 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");