ion: Add dummy driver for testing

Provide a basic dummy driver to register the ion device
and to install basic SYSTEM and SYSTEM_CONTIG heaps.

This allows for basic testing with ION without having
access to drivers or systems that have been enabled to use
ION.

Cc: Colin Cross <ccross@android.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Jesse Barker <jesse.barker@arm.com>
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
index a9a64ea..0f8fec1 100644 (file)
--- a/drivers/staging/android/ion/Kconfig
+++ b/drivers/staging/android/ion/Kconfig
@@ -17,6 +17,16 @@ config ION_TEST
          Choose this option to create a device that can be used to test the
          kernel and device side ION functions.
 
+config ION_DUMMY
+       bool "Dummy Ion driver"
+       depends on ION
+       help
+         Provides a dummy ION driver that registers the
+         /dev/ion device and some basic heaps. This can
+         be used for testing the ION infrastructure if
+         one doesn't have access to hardware drivers that
+         use ION.
+
 config ION_TEGRA
        tristate "Ion for Tegra"
        depends on ARCH_TEGRA && ION

diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
index 75039b9..b56fd2b 100644 (file)
--- a/drivers/staging/android/ion/Makefile
+++ b/drivers/staging/android/ion/Makefile
@@ -4,4 +4,7 @@ obj-$(CONFIG_ION_TEST) += ion_test.o
 ifdef CONFIG_COMPAT
 obj-$(CONFIG_ION) += compat_ion.o
 endif
+
+obj-$(CONFIG_ION_DUMMY) += ion_dummy_driver.o
 obj-$(CONFIG_ION_TEGRA) += tegra/
+

diff --git a/drivers/staging/android/ion/ion_dummy_driver.c b/drivers/staging/android/ion/ion_dummy_driver.c
new file mode 100644 (file)
index 0000000..6749d29
--- /dev/null
+++ b/drivers/staging/android/ion/ion_dummy_driver.c
@@ -0,0 +1,93 @@
+/*
+ * drivers/gpu/ion/ion_dummy_driver.c
+ *
+ * Copyright (C) 2013 Linaro, Inc
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/bootmem.h>
+#include <linux/memblock.h>
+#include <linux/sizes.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+struct ion_device *idev;
+struct ion_heap **heaps;
+
+struct ion_platform_heap dummy_heaps[] = {
+               {
+                       .id     = ION_HEAP_TYPE_SYSTEM,
+                       .type   = ION_HEAP_TYPE_SYSTEM,
+                       .name   = "system",
+               },
+               {
+                       .id     = ION_HEAP_TYPE_SYSTEM_CONTIG,
+                       .type   = ION_HEAP_TYPE_SYSTEM_CONTIG,
+                       .name   = "system contig",
+               },
+};
+
+struct ion_platform_data dummy_ion_pdata = {
+       .nr = 2,
+       .heaps = dummy_heaps,
+};
+
+static int __init ion_dummy_init(void)
+{
+       int i, err;
+
+       idev = ion_device_create(NULL);
+       heaps = kzalloc(sizeof(struct ion_heap *) * dummy_ion_pdata.nr,
+                       GFP_KERNEL);
+       if (!heaps)
+               return PTR_ERR(heaps);
+
+       for (i = 0; i < dummy_ion_pdata.nr; i++) {
+               struct ion_platform_heap *heap_data = &dummy_ion_pdata.heaps[i];
+
+               heaps[i] = ion_heap_create(heap_data);
+               if (IS_ERR_OR_NULL(heaps[i])) {
+                       err = PTR_ERR(heaps[i]);
+                       goto err;
+               }
+               ion_device_add_heap(idev, heaps[i]);
+       }
+       return 0;
+err:
+       for (i = 0; i < dummy_ion_pdata.nr; i++) {
+               if (heaps[i])
+                       ion_heap_destroy(heaps[i]);
+       }
+       kfree(heaps);
+
+       return err;
+}
+
+static void __exit ion_dummy_exit(void)
+{
+       int i;
+
+       ion_device_destroy(idev);
+
+       for (i = 0; i < dummy_ion_pdata.nr; i++)
+               ion_heap_destroy(heaps[i]);
+       kfree(heaps);
+
+       return;
+}
+
+module_init(ion_dummy_init);
+module_exit(ion_dummy_exit);
+