simpledrm.c

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/clk.h>
#include <linux/of_clk.h>
#include <linux/minmax.h>
#include <linux/of_address.h>
#include <linux/platform_data/simplefb.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/regulator/consumer.h>

#include <drm/drm_aperture.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_connector.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_damage_helper.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_generic.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper_vtables.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>

#define DRIVER_NAME	"simpledrm"
#define DRIVER_DESC	"DRM driver for simple-framebuffer platform devices"
#define DRIVER_DATE	"20200625"
#define DRIVER_MAJOR	1
#define DRIVER_MINOR	0

/*
 * Helpers for simplefb
 */

static int
simplefb_get_validated_int(struct drm_device *dev, const char *name,
			   uint32_t value)
{
	if (value > INT_MAX) {
		drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
			name, value);
		return -EINVAL;
	}
	return (int)value;
}

static int
simplefb_get_validated_int0(struct drm_device *dev, const char *name,
			    uint32_t value)
{
	if (!value) {
		drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
			name, value);
		return -EINVAL;
	}
	return simplefb_get_validated_int(dev, name, value);
}

static const struct drm_format_info *
simplefb_get_validated_format(struct drm_device *dev, const char *format_name)
{
	static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
	const struct simplefb_format *fmt = formats;
	const struct simplefb_format *end = fmt + ARRAY_SIZE(formats);
	const struct drm_format_info *info;