// SPDX-License-Identifier: MIT #include <drm/drm_client.h>#include <drm/drm_crtc_helper.h>#include <drm/drm_drv.h>#include <drm/drm_fbdev_client.h>#include <drm/drm_fb_helper.h>#include <drm/drm_fourcc.h>#include <drm/drm_print.h> /* * struct drm_client_funcs */ static void drm_fbdev_client_unregister(struct drm_client_dev *client){	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 	if (fb_helper->info) {		drm_fb_helper_unregister_info(fb_helper);	} else {		drm_client_release(&fb_helper->client);		drm_fb_helper_unprepare(fb_helper);		kfree(fb_helper);	}} static int drm_fbdev_client_restore(struct drm_client_dev *client){	drm_fb_helper_lastclose(client->dev); 	return 0;} static int drm_fbdev_client_hotplug(struct drm_client_dev *client){	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);	struct drm_device *dev = client->dev;	int ret; 	if (dev->fb_helper)		return drm_fb_helper_hotplug_event(dev->fb_helper); 	ret = drm_fb_helper_init(dev, fb_helper);	if (ret)		goto err_drm_err; 	if (!drm_drv_uses_atomic_modeset(dev))		drm_helper_disable_unused_functions(dev); 	ret = drm_fb_helper_initial_config(fb_helper);	if (ret)		goto err_drm_fb_helper_fini; 	return 0; err_drm_fb_helper_fini:	drm_fb_helper_fini(fb_helper);err_drm_err:	drm_err(dev, "fbdev: Failed to setup emulation (ret=%d)\n", ret);	return ret;} static int drm_fbdev_client_suspend(struct drm_client_dev *client, bool holds_console_lock){	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 	if (holds_console_lock)		drm_fb_helper_set_suspend(fb_helper, true);	else		drm_fb_helper_set_suspend_unlocked(fb_helper, true); 	return 0;} static int drm_fbdev_client_resume(struct drm_client_dev *client, bool holds_console_lock){	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 	if (holds_console_lock)		drm_fb_helper_set_suspend(fb_helper, false);	else		drm_fb_helper_set_suspend_unlocked(fb_helper, false); 	return 0;} static const struct drm_client_funcs drm_fbdev_client_funcs = {	.owner		= THIS_MODULE,	.unregister	= drm_fbdev_client_unregister,	.restore	= drm_fbdev_client_restore,	.hotplug	= drm_fbdev_client_hotplug,	.suspend	= drm_fbdev_client_suspend,	.resume		= drm_fbdev_client_resume,}; /** * drm_fbdev_client_setup() - Setup fbdev emulation * @dev: DRM device * @format: Preferred color format for the device. DRM_FORMAT_XRGB8888 *          is used if this is zero. * * This function sets up fbdev emulation. Restore, hotplug events and * teardown are all taken care of. Drivers that do suspend/resume need * to call drm_client_dev_suspend() and drm_client_dev_resume() by * themselves. Simple drivers might use drm_mode_config_helper_suspend(). * * This function is safe to call even when there are no connectors present. * Setup will be retried on the next hotplug event. * * The fbdev client is destroyed by drm_dev_unregister(). * * Returns: * 0 on success, or a negative errno code otherwise. */int drm_fbdev_client_setup(struct drm_device *dev, const struct drm_format_info *format){	struct drm_fb_helper *fb_helper;	unsigned int color_mode;	int ret; 	/* TODO: Use format info throughout DRM */	if (format) {		unsigned int bpp = drm_format_info_bpp(format, 0); 		switch (bpp) {		case 16:			color_mode = format->depth; // could also be 15			break;		default:			color_mode = bpp;		}	} else {		switch (dev->mode_config.preferred_depth) {		case 0:		case 24:			color_mode = 32;			break;		default:			color_mode = dev->mode_config.preferred_depth;		}	} 	drm_WARN(dev, !dev->registered, "Device has not been registered.\n");	drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);	if (!fb_helper)		return -ENOMEM;	drm_fb_helper_prepare(dev, fb_helper, color_mode, NULL); 	ret = drm_client_init(dev, &fb_helper->client, "fbdev", &drm_fbdev_client_funcs);	if (ret) {		drm_err(dev, "Failed to register client: %d\n", ret);		goto err_drm_client_init;	} 	drm_client_register(&fb_helper->client); 	return 0; err_drm_client_init:	drm_fb_helper_unprepare(fb_helper);	kfree(fb_helper);	return ret;}EXPORT_SYMBOL(drm_fbdev_client_setup);