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Subject[PATCH 6/9] drm: new sysfb DRM bus module
Date
This provides a new DRM bus helper for the system framebuffer bus. It is
very similar in its functionality to the DRM_USB helper. It allows to
write DRM drivers that register as SYSFB drivers to the system.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
---
drivers/gpu/drm/Kconfig | 5 ++
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/drm_sysfb.c | 145 ++++++++++++++++++++++++++++++++++++++++++++
include/drm/drmP.h | 4 ++
include/drm/drm_sysfb.h | 35 +++++++++++
5 files changed, 190 insertions(+)
create mode 100644 drivers/gpu/drm/drm_sysfb.c
create mode 100644 include/drm/drm_sysfb.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 18321b68b..2df448e 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -25,6 +25,11 @@ config DRM_USB
depends on USB_SUPPORT && USB_ARCH_HAS_HCD
select USB

+config DRM_SYSFB
+ tristate
+ depends on DRM
+ select SYSFB
+
config DRM_KMS_HELPER
tristate
depends on DRM
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 2ff5cef..9249b66 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -29,6 +29,7 @@ CFLAGS_drm_trace_points.o := -I$(src)

obj-$(CONFIG_DRM) += drm.o
obj-$(CONFIG_DRM_USB) += drm_usb.o
+obj-$(CONFIG_DRM_SYSFB) += drm_sysfb.o
obj-$(CONFIG_DRM_TTM) += ttm/
obj-$(CONFIG_DRM_TDFX) += tdfx/
obj-$(CONFIG_DRM_R128) += r128/
diff --git a/drivers/gpu/drm/drm_sysfb.c b/drivers/gpu/drm/drm_sysfb.c
new file mode 100644
index 0000000..4e8a823
--- /dev/null
+++ b/drivers/gpu/drm/drm_sysfb.c
@@ -0,0 +1,145 @@
+/*
+ * DRM Bus for sysfb drivers
+ *
+ * Copyright 2013 David Herrmann <dh.herrmann@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/sysfb.h>
+#include <drm/drmP.h>
+
+int drm_get_sysfb_dev(struct sysfb_device *sdev,
+ struct drm_driver *driver)
+{
+ struct drm_device *dev;
+ int ret;
+
+ DRM_DEBUG("\n");
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev_set_drvdata(&sdev->dev, dev);
+ dev->sysfbdev = sdev;
+ dev->dev = &sdev->dev;
+
+ mutex_lock(&drm_global_mutex);
+
+ ret = drm_fill_in_dev(dev, NULL, driver);
+ if (ret) {
+ DRM_ERROR("drm_fill_in_dev failed\n");
+ goto err_unlock;
+ }
+
+ if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
+ if (ret)
+ goto err_unlock;
+ }
+
+ ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
+ if (ret)
+ goto err_ctrl;
+
+ if (dev->driver->load) {
+ ret = dev->driver->load(dev, 0);
+ if (ret)
+ goto err_primary;
+ }
+
+ if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ ret = drm_mode_group_init_legacy_group(dev,
+ &dev->primary->mode_group);
+ if (ret)
+ goto err_primary;
+ }
+
+ list_add_tail(&dev->driver_item, &driver->device_list);
+
+ mutex_unlock(&drm_global_mutex);
+
+ DRM_INFO("initialized %s %d.%d.%d %s on minor %d\n",
+ driver->name, driver->major, driver->minor, driver->patchlevel,
+ driver->date, dev->primary->index);
+
+ return 0;
+
+err_primary:
+ drm_put_minor(&dev->primary);
+err_ctrl:
+ if (drm_core_check_feature(dev, DRIVER_MODESET))
+ drm_put_minor(&dev->control);
+err_unlock:
+ mutex_unlock(&drm_global_mutex);
+ kfree(dev);
+ return ret;
+}
+EXPORT_SYMBOL(drm_get_sysfb_dev);
+
+static int drm_sysfb_get_irq(struct drm_device *dev)
+{
+ return 0;
+}
+
+static const char *drm_sysfb_get_name(struct drm_device *dev)
+{
+ return dev_name(&dev->sysfbdev->dev);
+}
+
+static int drm_sysfb_set_busid(struct drm_device *dev,
+ struct drm_master *master)
+{
+ return 0;
+}
+
+static struct drm_bus drm_sysfb_bus = {
+ .bus_type = DRIVER_BUS_SYSFB,
+ .get_irq = drm_sysfb_get_irq,
+ .get_name = drm_sysfb_get_name,
+ .set_busid = drm_sysfb_set_busid,
+};
+
+int drm_sysfb_init(struct drm_driver *driver, struct sysfb_driver *sdrv)
+{
+ DRM_DEBUG("\n");
+
+ INIT_LIST_HEAD(&driver->device_list);
+ driver->kdriver.sysfb = sdrv;
+ driver->bus = &drm_sysfb_bus;
+
+ return sysfb_register_driver(sdrv);
+}
+EXPORT_SYMBOL(drm_sysfb_init);
+
+void drm_sysfb_exit(struct drm_driver *driver, struct sysfb_driver *sdrv)
+{
+ DRM_DEBUG("\n");
+
+ sysfb_unregister_driver(sdrv);
+ DRM_INFO("module unloaded\n");
+}
+EXPORT_SYMBOL(drm_sysfb_exit);
+
+MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
+MODULE_DESCRIPTION("DRM sysfb support");
+MODULE_LICENSE("GPL and additional rights");
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 3fd8280..e5d73fe 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -71,6 +71,7 @@
#endif
#include <linux/workqueue.h>
#include <linux/poll.h>
+#include <linux/sysfb.h>
#include <asm/pgalloc.h>
#include <drm/drm.h>
#include <drm/drm_sarea.h>
@@ -157,6 +158,7 @@ int drm_err(const char *func, const char *format, ...);
#define DRIVER_BUS_PCI 0x1
#define DRIVER_BUS_PLATFORM 0x2
#define DRIVER_BUS_USB 0x3
+#define DRIVER_BUS_SYSFB 0x4

/***********************************************************************/
/** \name Begin the DRM... */
@@ -953,6 +955,7 @@ struct drm_driver {
struct pci_driver *pci;
struct platform_device *platform_device;
struct usb_driver *usb;
+ struct sysfb_driver *sysfb;
} kdriver;
struct drm_bus *bus;

@@ -1173,6 +1176,7 @@ struct drm_device {

struct platform_device *platformdev; /**< Platform device struture */
struct usb_device *usbdev;
+ struct sysfb_device *sysfbdev;

struct drm_sg_mem *sg; /**< Scatter gather memory */
unsigned int num_crtcs; /**< Number of CRTCs on this device */
diff --git a/include/drm/drm_sysfb.h b/include/drm/drm_sysfb.h
new file mode 100644
index 0000000..ced54d7
--- /dev/null
+++ b/include/drm/drm_sysfb.h
@@ -0,0 +1,35 @@
+#ifndef __DRM_SYSFB_H
+#define __DRM_SYSFB_H
+/*
+ * DRM Bus for sysfb drivers
+ *
+ * Copyright 2013 David Herrmann <dh.herrmann@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <drmP.h>
+#include <linux/sysfb.h>
+
+int drm_sysfb_init(struct drm_driver *driver, struct sysfb_driver *sdrv);
+void drm_sysfb_exit(struct drm_driver *driver, struct sysfb_driver *sdrv);
+int drm_get_sysfb_dev(struct sysfb_device *sdev,
+ struct drm_driver *driver);
+
+#endif /* __DRM_SYSFB_H */
--
1.8.1.3


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