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Message-Id: <1318951776-19393-6-git-send-email-jic23@cam.ac.uk>
Date: Tue, 18 Oct 2011 16:29:35 +0100
From: Jonathan Cameron <jic23@....ac.uk>
To: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Cc: linus.ml.walleij@...il.com, zdevai@...il.com,
linux@....linux.org.uk, arnd@...db.de,
broonie@...nsource.wolfsonmicro.com, gregkh@...e.de,
Jonathan Cameron <jic23@....ac.uk>
Subject: [PATCH 5/6] IIO:Temporary example hwmon interface.
Not to be merged. Breaks all sorts of elements of the hwmon
interface spec and is not flexible enough.
---
drivers/iio/Kconfig | 7 +++
drivers/iio/Makefile | 1 +
drivers/iio/iio_hwmon.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 112 insertions(+), 0 deletions(-)
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index 308bc97..334f633 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -11,6 +11,13 @@ menuconfig IIO
if IIO
+config IIO_HWMON
+ tristate "Temporary dummy driver to test in kern interface"
+ help
+ Dirty test of in kernel framework. Not intended to ever
+ merge in current state.
+
+
source "drivers/iio/adc/Kconfig"
source "drivers/iio/imu/Kconfig"
source "drivers/iio/light/Kconfig"
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index cfb588a..5f9c01a 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -6,6 +6,7 @@ obj-y = inkern.o
obj-$(CONFIG_IIO) += iio.o
industrialio-y := core.o
+obj-$(CONFIG_IIO_HWMON) += iio_hwmon.o
obj-y += adc/
obj-y += imu/
obj-y += light/
diff --git a/drivers/iio/iio_hwmon.c b/drivers/iio/iio_hwmon.c
new file mode 100644
index 0000000..03fc590
--- /dev/null
+++ b/drivers/iio/iio_hwmon.c
@@ -0,0 +1,104 @@
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/iio/inkern.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+struct iio_hwmon_state {
+ struct iio_channel *channel;
+ struct device *hwmon_dev;
+};
+
+static ssize_t iio_hwmon_read_val(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int val, ret;
+ struct iio_hwmon_state *state = dev_get_drvdata(dev);
+
+ ret = iio_read_channel_raw(state->channel, &val);
+ if (ret < 0)
+ return ret;
+ return sprintf(buf, "%d\n", val);
+}
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, iio_hwmon_read_val, NULL, 0);
+
+static struct attribute *iio_hwmon_attrs[] = {
+ &sensor_dev_attr_in1_input.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group iio_hwmon_attr_group = {
+ .attrs = iio_hwmon_attrs
+};
+
+static int __devinit iio_hwmon_probe(struct platform_device *pdev)
+{
+ struct iio_hwmon_state *st;
+ int ret;
+
+ st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ st->channel = iio_channel_get(&pdev->dev, NULL, "testchan1");
+ if (IS_ERR(st->channel)) {
+ ret = PTR_ERR(st->channel);
+ goto error_free_state;
+ }
+
+ st->hwmon_dev = hwmon_device_register(&pdev->dev);
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &iio_hwmon_attr_group);
+ if (ret < 0)
+ goto error_release_channel;
+
+ platform_set_drvdata(pdev, st);
+ return 0;
+
+error_release_channel:
+ iio_channel_release(st->channel);
+error_free_state:
+ kfree(st);
+error_ret:
+ return ret;
+}
+
+static int __devexit iio_hwmon_remove(struct platform_device *pdev)
+{
+ struct iio_hwmon_state *st = platform_get_drvdata(pdev);
+ sysfs_remove_group(&pdev->dev.kobj, &iio_hwmon_attr_group);
+ hwmon_device_unregister(st->hwmon_dev);
+ iio_channel_release(st->channel);
+ return 0;
+}
+
+static struct platform_driver __refdata iio_hwmon_driver = {
+ .driver = {
+ .name = "iio_hwmon",
+ .owner = THIS_MODULE,
+ },
+ .probe = iio_hwmon_probe,
+ .remove = __devexit_p(iio_hwmon_remove),
+};
+
+static int iio_inkern_init(void)
+{
+ return platform_driver_register(&iio_hwmon_driver);
+}
+module_init(iio_inkern_init);
+
+static void iio_inkern_exit(void)
+{
+ platform_driver_unregister(&iio_hwmon_driver);
+}
+module_exit(iio_inkern_exit);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@....ac.uk>");
+MODULE_DESCRIPTION("IIO to hwmon driver");
+MODULE_LICENSE("GPL v2");
--
1.7.7
--
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