iio: dummy: Convert IIO dummy to configfs

We register a new device type named "dummy", this will create a
configfs entry under:
	* /config/iio/devices/dummy.

Creating dummy devices is now as simple as:

$ mkdir /config/iio/devices/dummy/my_dummy_device

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

2 files changed, 38 insertions, 65 deletions

diff --git a/drivers/iio/dummy/Kconfig b/drivers/iio/dummy/Kconfig
index 71805ced1aae..aa5824d96a43 100644
--- a/drivers/iio/dummy/Kconfig
+++ b/drivers/iio/dummy/Kconfig
@@ -10,6 +10,7 @@ config IIO_DUMMY_EVGEN
 
 config IIO_SIMPLE_DUMMY
        tristate "An example driver with no hardware requirements"
+       depends on IIO_SW_DEVICE
        help
          Driver intended mainly as documentation for how to write
          a driver. May also be useful for testing userspace code
diff --git a/drivers/iio/dummy/iio_simple_dummy.c b/drivers/iio/dummy/iio_simple_dummy.c
index 43fe4ba7d0dc..ad3410e528b6 100644
--- a/drivers/iio/dummy/iio_simple_dummy.c
+++ b/drivers/iio/dummy/iio_simple_dummy.c
@@ -17,26 +17,18 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/string.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
 #include <linux/iio/buffer.h>
+#include <linux/iio/sw_device.h>
 #include "iio_simple_dummy.h"
 
-/*
- * A few elements needed to fake a bus for this driver
- * Note instances parameter controls how many of these
- * dummy devices are registered.
- */
-static unsigned instances = 1;
-module_param(instances, uint, 0);
-
-/* Pointer array used to fake bus elements */
-static struct iio_dev **iio_dummy_devs;
-
-/* Fake a name for the part number, usually obtained from the id table */
-static const char *iio_dummy_part_number = "iio_dummy_part_no";
+static struct config_item_type iio_dummy_type = {
+        .ct_owner = THIS_MODULE,
+};
 
 /**
  * struct iio_dummy_accel_calibscale - realworld to register mapping
@@ -572,12 +564,18 @@ static int iio_dummy_init_device(struct iio_dev *indio_dev)
  *                      const struct i2c_device_id *id)
  * SPI: iio_dummy_probe(struct spi_device *spi)
  */
-static int iio_dummy_probe(int index)
+static struct iio_sw_device *iio_dummy_probe(const char *name)
 {
         int ret;
         struct iio_dev *indio_dev;
         struct iio_dummy_state *st;
+        struct iio_sw_device *swd;
 
+        swd = kzalloc(sizeof(*swd), GFP_KERNEL);
+        if (!swd) {
+                ret = -ENOMEM;
+                goto error_kzalloc;
+        }
         /*
          * Allocate an IIO device.
          *
@@ -608,7 +606,7 @@ static int iio_dummy_probe(int index)
          * i2c_set_clientdata(client, indio_dev);
          * spi_set_drvdata(spi, indio_dev);
          */
-        iio_dummy_devs[index] = indio_dev;
+        swd->device = indio_dev;
 
         /*
          * Set the device name.
@@ -619,7 +617,7 @@ static int iio_dummy_probe(int index)
          *    indio_dev->name = id->name;
          *    indio_dev->name = spi_get_device_id(spi)->name;
          */
-        indio_dev->name = iio_dummy_part_number;
+        indio_dev->name = kstrdup(name, GFP_KERNEL);
 
         /* Provide description of available channels */
         indio_dev->channels = iio_dummy_channels;
@@ -646,7 +644,9 @@ static int iio_dummy_probe(int index)
         if (ret < 0)
                 goto error_unconfigure_buffer;
 
-        return 0;
+        iio_swd_group_init_type_name(swd, name, &iio_dummy_type);
+
+        return swd;
 error_unconfigure_buffer:
         iio_simple_dummy_unconfigure_buffer(indio_dev);
 error_unregister_events:
@@ -654,16 +654,18 @@ error_unregister_events:
 error_free_device:
         iio_device_free(indio_dev);
 error_ret:
-        return ret;
+        kfree(swd);
+error_kzalloc:
+        return ERR_PTR(ret);
 }
 
 /**
  * iio_dummy_remove() - device instance removal function
- * @index: device index.
+ * @swd: pointer to software IIO device abstraction
  *
  * Parameters follow those of iio_dummy_probe for buses.
  */
-static void iio_dummy_remove(int index)
+static int iio_dummy_remove(struct iio_sw_device *swd)
 {
         /*
          * Get a pointer to the device instance iio_dev structure
@@ -671,7 +673,7 @@ static void iio_dummy_remove(int index)
          * struct iio_dev *indio_dev = i2c_get_clientdata(client);
          * struct iio_dev *indio_dev = spi_get_drvdata(spi);
          */
-        struct iio_dev *indio_dev = iio_dummy_devs[index];
+        struct iio_dev *indio_dev = swd->device;
 
         /* Unregister the device */
         iio_device_unregister(indio_dev);
@@ -684,11 +686,13 @@ static void iio_dummy_remove(int index)
         iio_simple_dummy_events_unregister(indio_dev);
 
         /* Free all structures */
+        kfree(indio_dev->name);
         iio_device_free(indio_dev);
-}
 
+        return 0;
+}
 /**
- * iio_dummy_init() -  device driver registration
+ * module_iio_sw_device_driver() -  device driver registration
  *
  * Varies depending on bus type of the device. As there is no device
  * here, call probe directly. For information on device registration
@@ -697,50 +701,18 @@ static void iio_dummy_remove(int index)
  * spi:
  * Documentation/spi/spi-summary
  */
-static __init int iio_dummy_init(void)
-{
-        int i, ret;
-
-        if (instances > 10) {
-                instances = 1;
-                return -EINVAL;
-        }
-
-        /* Fake a bus */
-        iio_dummy_devs = kcalloc(instances, sizeof(*iio_dummy_devs),
-                                 GFP_KERNEL);
-        /* Here we have no actual device so call probe */
-        for (i = 0; i < instances; i++) {
-                ret = iio_dummy_probe(i);
-                if (ret < 0)
-                        goto error_remove_devs;
-        }
-        return 0;
-
-error_remove_devs:
-        while (i--)
-                iio_dummy_remove(i);
-
-        kfree(iio_dummy_devs);
-        return ret;
-}
-module_init(iio_dummy_init);
+static const struct iio_sw_device_ops iio_dummy_device_ops = {
+        .probe = iio_dummy_probe,
+        .remove = iio_dummy_remove,
+};
 
-/**
- * iio_dummy_exit() - device driver removal
- *
- * Varies depending on bus type of the device.
- * As there is no device here, call remove directly.
- */
-static __exit void iio_dummy_exit(void)
-{
-        int i;
+static struct iio_sw_device_type iio_dummy_device = {
+        .name = "dummy",
+        .owner = THIS_MODULE,
+        .ops = &iio_dummy_device_ops,
+};
 
-        for (i = 0; i < instances; i++)
-                iio_dummy_remove(i);
-        kfree(iio_dummy_devs);
-}
-module_exit(iio_dummy_exit);
+module_iio_sw_device_driver(iio_dummy_device);
 
 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
 MODULE_DESCRIPTION("IIO dummy driver");