// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2016 Noralf Trønnes
 */

#include <linux/module.h>
#include <linux/slab.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>

/**
 * DOC: overview
 *
 * This helper library provides helpers for drivers for simple display
 * hardware.
 *
 * drm_simple_display_pipe_init() initializes a simple display pipeline
 * which has only one full-screen scanout buffer feeding one output. The
 * pipeline is represented by &struct drm_simple_display_pipe and binds
 * together &drm_plane, &drm_crtc and &drm_encoder structures into one fixed
 * entity. Some flexibility for code reuse is provided through a separately
 * allocated &drm_connector object and supporting optional &drm_bridge
 * encoder drivers.
 *
 * Many drivers require only a very simple encoder that fulfills the minimum
 * requirements of the display pipeline and does not add additional
 * functionality. The function drm_simple_encoder_init() provides an
 * implementation of such an encoder.
 */

static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = {
        .destroy = drm_encoder_cleanup,
};

/**
 * drm_simple_encoder_init - Initialize a preallocated encoder with
 *                           basic functionality.
 * @dev: drm device
 * @encoder: the encoder to initialize
 * @encoder_type: user visible type of the encoder
 *
 * Initialises a preallocated encoder that has no further functionality.
 * Settings for possible CRTC and clones are left to their initial values.
 * The encoder will be cleaned up automatically as part of the mode-setting
 * cleanup.
 *
 * The caller of drm_simple_encoder_init() is responsible for freeing
 * the encoder's memory after the encoder has been cleaned up. At the
 * moment this only works reliably if the encoder data structure is
 * stored in the device structure. Free the encoder's memory as part of
 * the device release function.
 *
 * FIXME: Later improvements to DRM's resource management may allow for
 *        an automated kfree() of the encoder's memory.
 *
 * Returns:
 * Zero on success, error code on failure.
 */
int drm_simple_encoder_init(struct drm_device *dev,
                            struct drm_encoder *encoder,
                            int encoder_type)
{
        return drm_encoder_init(dev, encoder,
                                &drm_simple_encoder_funcs_cleanup,
                                encoder_type, NULL);
}
EXPORT_SYMBOL(drm_simple_encoder_init);

static enum drm_mode_status
drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
                               const struct drm_display_mode *mode)
{
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
        if (!pipe->funcs || !pipe->funcs->mode_valid)
                /* Anything goes */
                return MODE_OK;

        return pipe->funcs->mode_valid(pipe, mode);
}

static int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
                                     struct drm_crtc_state *state)
{
        bool has_primary = state->plane_mask &
                           drm_plane_mask(crtc->primary);

        /* We always want to have an active plane with an active CRTC */
        if (has_primary != state->enable)
                return -EINVAL;

        return drm_atomic_add_affected_planes(state->state, crtc);
}

static void drm_simple_kms_crtc_enable(struct drm_crtc *crtc,
                                       struct drm_crtc_state *old_state)
{
        struct drm_plane *plane;
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
        if (!pipe->funcs || !pipe->funcs->enable)
                return;

        plane = &pipe->plane;
        pipe->funcs->enable(pipe, crtc->state, plane->state);
}

static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc,
                                        struct drm_crtc_state *old_state)
{
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
        if (!pipe->funcs || !pipe->funcs->disable)
                return;

        pipe->funcs->disable(pipe);
}

static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
        .mode_valid = drm_simple_kms_crtc_mode_valid,
        .atomic_check = drm_simple_kms_crtc_check,
        .atomic_enable = drm_simple_kms_crtc_enable,
        .atomic_disable = drm_simple_kms_crtc_disable,
};

static int drm_simple_kms_crtc_enable_vblank(struct drm_crtc *crtc)
{
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
        if (!pipe->funcs || !pipe->funcs->enable_vblank)
                return 0;

        return pipe->funcs->enable_vblank(pipe);
}

static void drm_simple_kms_crtc_disable_vblank(struct drm_crtc *crtc)
{
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
        if (!pipe->funcs || !pipe->funcs->disable_vblank)
                return;

        pipe->funcs->disable_vblank(pipe);
}

static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = {
        .reset = drm_atomic_helper_crtc_reset,
        .destroy = drm_crtc_cleanup,
        .set_config = drm_atomic_helper_set_config,
        .page_flip = drm_atomic_helper_page_flip,
        .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
        .enable_vblank = drm_simple_kms_crtc_enable_vblank,
        .disable_vblank = drm_simple_kms_crtc_disable_vblank,
};

static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane,
                                        struct drm_plane_state *plane_state)
{
        struct drm_simple_display_pipe *pipe;
        struct drm_crtc_state *crtc_state;
        int ret;

        pipe = container_of(plane, struct drm_simple_display_pipe, plane);
        crtc_state = drm_atomic_get_new_crtc_state(plane_state->state,
                                                   &pipe->crtc);

        ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  false, true);
        if (ret)
                return ret;

        if (!plane_state->visible)
                return 0;

        if (!pipe->funcs || !pipe->funcs->check)
                return 0;

        return pipe->funcs->check(pipe, plane_state, crtc_state);
}

static void drm_simple_kms_plane_atomic_update(struct drm_plane *plane,
                                        struct drm_plane_state *old_pstate)
{
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(plane, struct drm_simple_display_pipe, plane);
        if (!pipe->funcs || !pipe->funcs->update)
                return;

        pipe->funcs->update(pipe, old_pstate);
}

static int drm_simple_kms_plane_prepare_fb(struct drm_plane *plane,
                                           struct drm_plane_state *state)
{
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(plane, struct drm_simple_display_pipe, plane);
        if (!pipe->funcs || !pipe->funcs->prepare_fb)
                return 0;

        return pipe->funcs->prepare_fb(pipe, state);
}

static void drm_simple_kms_plane_cleanup_fb(struct drm_plane *plane,
                                            struct drm_plane_state *state)
{
        struct drm_simple_display_pipe *pipe;

        pipe = container_of(plane, struct drm_simple_display_pipe, plane);
        if (!pipe->funcs || !pipe->funcs->cleanup_fb)
                return;

        pipe->funcs->cleanup_fb(pipe, state);
}

static bool drm_simple_kms_format_mod_supported(struct drm_plane *plane,
                                                uint32_t format,
                                                uint64_t modifier)
{
        return modifier == DRM_FORMAT_MOD_LINEAR;
}

static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = {
        .prepare_fb = drm_simple_kms_plane_prepare_fb,
        .cleanup_fb = drm_simple_kms_plane_cleanup_fb,
        .atomic_check = drm_simple_kms_plane_atomic_check,
        .atomic_update = drm_simple_kms_plane_atomic_update,
};

static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
        .update_plane           = drm_atomic_helper_update_plane,
        .disable_plane          = drm_atomic_helper_disable_plane,
        .destroy                = drm_plane_cleanup,
        .reset                  = drm_atomic_helper_plane_reset,
        .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
        .atomic_destroy_state   = drm_atomic_helper_plane_destroy_state,
        .format_mod_supported   = drm_simple_kms_format_mod_supported,
};

/**
 * drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe
 * @pipe: simple display pipe object
 * @bridge: bridge to attach
 *
 * Makes it possible to still use the drm_simple_display_pipe helpers when
 * a DRM bridge has to be used.
 *
 * Note that you probably want to initialize the pipe by passing a NULL
 * connector to drm_simple_display_pipe_init().
 *
 * Returns:
 * Zero on success, negative error code on failure.
 */
int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
                                          struct drm_bridge *bridge)
{
        return drm_bridge_attach(&pipe->encoder, bridge, NULL, 0);
}
EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);

/**
 * drm_simple_display_pipe_init - Initialize a simple display pipeline
 * @dev: DRM device
 * @pipe: simple display pipe object to initialize
 * @funcs: callbacks for the display pipe (optional)
 * @formats: array of supported formats (DRM_FORMAT\_\*)
 * @format_count: number of elements in @formats
 * @format_modifiers: array of formats modifiers
 * @connector: connector to attach and register (optional)
 *
 * Sets up a display pipeline which consist of a really simple
 * plane-crtc-encoder pipe.
 *
 * If a connector is supplied, the pipe will be coupled with the provided
 * connector. You may supply a NULL connector when using drm bridges, that
 * handle connectors themselves (see drm_simple_display_pipe_attach_bridge()).
 *
 * Teardown of a simple display pipe is all handled automatically by the drm
 * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
 * release the memory for the structure themselves.
 *
 * Returns:
 * Zero on success, negative error code on failure.
 */
int drm_simple_display_pipe_init(struct drm_device *dev,
                        struct drm_simple_display_pipe *pipe,
                        const struct drm_simple_display_pipe_funcs *funcs,
                        const uint32_t *formats, unsigned int format_count,
                        const uint64_t *format_modifiers,
                        struct drm_connector *connector)
{
        struct drm_encoder *encoder = &pipe->encoder;
        struct drm_plane *plane = &pipe->plane;
        struct drm_crtc *crtc = &pipe->crtc;
        int ret;

        pipe->connector = connector;
        pipe->funcs = funcs;

        drm_plane_helper_add(plane, &drm_simple_kms_plane_helper_funcs);
        ret = drm_universal_plane_init(dev, plane, 0,
                                       &drm_simple_kms_plane_funcs,
                                       formats, format_count,
                                       format_modifiers,
                                       DRM_PLANE_TYPE_PRIMARY, NULL);
        if (ret)
                return ret;

        drm_crtc_helper_add(crtc, &drm_simple_kms_crtc_helper_funcs);
        ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
                                        &drm_simple_kms_crtc_funcs, NULL);
        if (ret)
                return ret;

        encoder->possible_crtcs = drm_crtc_mask(crtc);
        ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE);
        if (ret || !connector)
                return ret;

        return drm_connector_attach_encoder(connector, encoder);
}
EXPORT_SYMBOL(drm_simple_display_pipe_init);

MODULE_LICENSE("GPL");