// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (C) 2016 Noralf Trønnes */ #include <drm/drm_atomic_helper.h>#include <drm/drm_drv.h>#include <drm/drm_gem_framebuffer_helper.h>#include <drm/drm_modes.h>#include <drm/drm_probe_helper.h>#include <drm/drm_print.h>#include <drm/drm_simple_kms_helper.h> struct tinydrm_connector {	struct drm_connector base;	struct drm_display_mode mode;}; static inline struct tinydrm_connector *to_tinydrm_connector(struct drm_connector *connector){	return container_of(connector, struct tinydrm_connector, base);} static int tinydrm_connector_get_modes(struct drm_connector *connector){	struct tinydrm_connector *tconn = to_tinydrm_connector(connector);	struct drm_display_mode *mode; 	mode = drm_mode_duplicate(connector->dev, &tconn->mode);	if (!mode) {		DRM_ERROR("Failed to duplicate mode\n");		return 0;	} 	if (mode->name[0] == '\0')		drm_mode_set_name(mode); 	mode->type |= DRM_MODE_TYPE_PREFERRED;	drm_mode_probed_add(connector, mode); 	if (mode->width_mm) {		connector->display_info.width_mm = mode->width_mm;		connector->display_info.height_mm = mode->height_mm;	} 	return 1;} static const struct drm_connector_helper_funcs tinydrm_connector_hfuncs = {	.get_modes = tinydrm_connector_get_modes,}; static enum drm_connector_statustinydrm_connector_detect(struct drm_connector *connector, bool force){	if (drm_dev_is_unplugged(connector->dev))		return connector_status_disconnected; 	return connector->status;} static void tinydrm_connector_destroy(struct drm_connector *connector){	struct tinydrm_connector *tconn = to_tinydrm_connector(connector); 	drm_connector_cleanup(connector);	kfree(tconn);} static const struct drm_connector_funcs tinydrm_connector_funcs = {	.reset = drm_atomic_helper_connector_reset,	.detect = tinydrm_connector_detect,	.fill_modes = drm_helper_probe_single_connector_modes,	.destroy = tinydrm_connector_destroy,	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,}; struct drm_connector *tinydrm_connector_create(struct drm_device *drm,			 const struct drm_display_mode *mode,			 int connector_type){	struct tinydrm_connector *tconn;	struct drm_connector *connector;	int ret; 	tconn = kzalloc(sizeof(*tconn), GFP_KERNEL);	if (!tconn)		return ERR_PTR(-ENOMEM); 	drm_mode_copy(&tconn->mode, mode);	connector = &tconn->base; 	drm_connector_helper_add(connector, &tinydrm_connector_hfuncs);	ret = drm_connector_init(drm, connector, &tinydrm_connector_funcs,				 connector_type);	if (ret) {		kfree(tconn);		return ERR_PTR(ret);	} 	connector->status = connector_status_connected; 	return connector;} static int tinydrm_rotate_mode(struct drm_display_mode *mode,			       unsigned int rotation){	if (rotation == 0 || rotation == 180) {		return 0;	} else if (rotation == 90 || rotation == 270) {		swap(mode->hdisplay, mode->vdisplay);		swap(mode->hsync_start, mode->vsync_start);		swap(mode->hsync_end, mode->vsync_end);		swap(mode->htotal, mode->vtotal);		swap(mode->width_mm, mode->height_mm);		return 0;	} else {		return -EINVAL;	}} /** * tinydrm_display_pipe_init - Initialize display pipe * @drm: DRM device * @pipe: Display pipe * @funcs: Display pipe functions * @connector_type: Connector type * @formats: Array of supported formats (DRM_FORMAT\_\*) * @format_count: Number of elements in @formats * @mode: Supported mode * @rotation: Initial @mode rotation in degrees Counter Clock Wise * * This function sets up a &drm_simple_display_pipe with a &drm_connector that * has one fixed &drm_display_mode which is rotated according to @rotation. * * Returns: * Zero on success, negative error code on failure. */int tinydrm_display_pipe_init(struct drm_device *drm,			      struct drm_simple_display_pipe *pipe,			      const struct drm_simple_display_pipe_funcs *funcs,			      int connector_type,			      const uint32_t *formats,			      unsigned int format_count,			      const struct drm_display_mode *mode,			      unsigned int rotation){	struct drm_display_mode mode_copy;	struct drm_connector *connector;	int ret;	static const uint64_t modifiers[] = {		DRM_FORMAT_MOD_LINEAR,		DRM_FORMAT_MOD_INVALID	}; 	drm_mode_copy(&mode_copy, mode);	ret = tinydrm_rotate_mode(&mode_copy, rotation);	if (ret) {		DRM_ERROR("Illegal rotation value %u\n", rotation);		return -EINVAL;	} 	drm->mode_config.min_width = mode_copy.hdisplay;	drm->mode_config.max_width = mode_copy.hdisplay;	drm->mode_config.min_height = mode_copy.vdisplay;	drm->mode_config.max_height = mode_copy.vdisplay; 	connector = tinydrm_connector_create(drm, &mode_copy, connector_type);	if (IS_ERR(connector))		return PTR_ERR(connector); 	return drm_simple_display_pipe_init(drm, pipe, funcs, formats,					    format_count, modifiers, connector);}EXPORT_SYMBOL(tinydrm_display_pipe_init);