mgag200_vga.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2
 3#include <drm/drm_atomic_helper.h>
 4#include <drm/drm_modeset_helper_vtables.h>
 5#include <drm/drm_print.h>
 6#include <drm/drm_probe_helper.h>
 7
 8#include "mgag200_ddc.h"
 9#include "mgag200_drv.h"
10
11static const struct drm_encoder_funcs mgag200_dac_encoder_funcs = {
12	.destroy = drm_encoder_cleanup
13};
14
15static const struct drm_connector_helper_funcs mgag200_vga_connector_helper_funcs = {
16	.get_modes = drm_connector_helper_get_modes,
17	.detect_ctx = drm_connector_helper_detect_from_ddc
18};
19
20static const struct drm_connector_funcs mgag200_vga_connector_funcs = {
21	.reset                  = drm_atomic_helper_connector_reset,
22	.fill_modes             = drm_helper_probe_single_connector_modes,
23	.destroy                = drm_connector_cleanup,
24	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
25	.atomic_destroy_state   = drm_atomic_helper_connector_destroy_state
26};
27
28int mgag200_vga_output_init(struct mga_device *mdev)
29{
30	struct drm_device *dev = &mdev->base;
31	struct drm_crtc *crtc = &mdev->crtc;
32	struct drm_encoder *encoder;
33	struct drm_connector *connector;
34	struct i2c_adapter *ddc;
35	int ret;
36
37	encoder = &mdev->output.vga.encoder;
38	ret = drm_encoder_init(dev, encoder, &mgag200_dac_encoder_funcs,
39			       DRM_MODE_ENCODER_DAC, NULL);
40	if (ret) {
41		drm_err(dev, "drm_encoder_init() failed: %d\n", ret);
42		return ret;
43	}
44	encoder->possible_crtcs = drm_crtc_mask(crtc);
45
46	ddc = mgag200_ddc_create(mdev);
47	if (IS_ERR(ddc)) {
48		ret = PTR_ERR(ddc);
49		drm_err(dev, "failed to add DDC bus: %d\n", ret);
50		return ret;
51	}
52
53	connector = &mdev->output.vga.connector;
54	ret = drm_connector_init_with_ddc(dev, connector,
55					  &mgag200_vga_connector_funcs,
56					  DRM_MODE_CONNECTOR_VGA, ddc);
57	if (ret) {
58		drm_err(dev, "drm_connector_init_with_ddc() failed: %d\n", ret);
59		return ret;
60	}
61	drm_connector_helper_add(connector, &mgag200_vga_connector_helper_funcs);
62
63	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
64			    DRM_CONNECTOR_POLL_DISCONNECT;
65
66	ret = drm_connector_attach_encoder(connector, encoder);
67	if (ret) {
68		drm_err(dev, "drm_connector_attach_encoder() failed: %d\n", ret);
69		return ret;
70	}
71
72	return 0;
73}