1c575b7eeSOleksandr Andrushchenko // SPDX-License-Identifier: GPL-2.0 OR MIT
2c575b7eeSOleksandr Andrushchenko
3c575b7eeSOleksandr Andrushchenko /*
4c575b7eeSOleksandr Andrushchenko * Xen para-virtual DRM device
5c575b7eeSOleksandr Andrushchenko *
6c575b7eeSOleksandr Andrushchenko * Copyright (C) 2016-2018 EPAM Systems Inc.
7c575b7eeSOleksandr Andrushchenko *
8c575b7eeSOleksandr Andrushchenko * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
9c575b7eeSOleksandr Andrushchenko */
10c575b7eeSOleksandr Andrushchenko
11c575b7eeSOleksandr Andrushchenko #include <linux/device.h>
12c575b7eeSOleksandr Andrushchenko
13*2ea2269eSSam Ravnborg #include <drm/drm_print.h>
14*2ea2269eSSam Ravnborg
15c575b7eeSOleksandr Andrushchenko #include <xen/interface/io/displif.h>
16c575b7eeSOleksandr Andrushchenko #include <xen/xenbus.h>
17c575b7eeSOleksandr Andrushchenko
18c575b7eeSOleksandr Andrushchenko #include "xen_drm_front.h"
19c575b7eeSOleksandr Andrushchenko #include "xen_drm_front_cfg.h"
20c575b7eeSOleksandr Andrushchenko
cfg_connector(struct xen_drm_front_info * front_info,struct xen_drm_front_cfg_connector * connector,const char * path,int index)21c575b7eeSOleksandr Andrushchenko static int cfg_connector(struct xen_drm_front_info *front_info,
22c575b7eeSOleksandr Andrushchenko struct xen_drm_front_cfg_connector *connector,
23c575b7eeSOleksandr Andrushchenko const char *path, int index)
24c575b7eeSOleksandr Andrushchenko {
25c575b7eeSOleksandr Andrushchenko char *connector_path;
26c575b7eeSOleksandr Andrushchenko
27c575b7eeSOleksandr Andrushchenko connector_path = devm_kasprintf(&front_info->xb_dev->dev,
28c575b7eeSOleksandr Andrushchenko GFP_KERNEL, "%s/%d", path, index);
29c575b7eeSOleksandr Andrushchenko if (!connector_path)
30c575b7eeSOleksandr Andrushchenko return -ENOMEM;
31c575b7eeSOleksandr Andrushchenko
32c575b7eeSOleksandr Andrushchenko if (xenbus_scanf(XBT_NIL, connector_path, XENDISPL_FIELD_RESOLUTION,
33c575b7eeSOleksandr Andrushchenko "%d" XENDISPL_RESOLUTION_SEPARATOR "%d",
34c575b7eeSOleksandr Andrushchenko &connector->width, &connector->height) < 0) {
35c575b7eeSOleksandr Andrushchenko /* either no entry configured or wrong resolution set */
36c575b7eeSOleksandr Andrushchenko connector->width = 0;
37c575b7eeSOleksandr Andrushchenko connector->height = 0;
38c575b7eeSOleksandr Andrushchenko return -EINVAL;
39c575b7eeSOleksandr Andrushchenko }
40c575b7eeSOleksandr Andrushchenko
41c575b7eeSOleksandr Andrushchenko connector->xenstore_path = connector_path;
42c575b7eeSOleksandr Andrushchenko
43c575b7eeSOleksandr Andrushchenko DRM_INFO("Connector %s: resolution %dx%d\n",
44c575b7eeSOleksandr Andrushchenko connector_path, connector->width, connector->height);
45c575b7eeSOleksandr Andrushchenko return 0;
46c575b7eeSOleksandr Andrushchenko }
47c575b7eeSOleksandr Andrushchenko
xen_drm_front_cfg_card(struct xen_drm_front_info * front_info,struct xen_drm_front_cfg * cfg)48c575b7eeSOleksandr Andrushchenko int xen_drm_front_cfg_card(struct xen_drm_front_info *front_info,
49c575b7eeSOleksandr Andrushchenko struct xen_drm_front_cfg *cfg)
50c575b7eeSOleksandr Andrushchenko {
51c575b7eeSOleksandr Andrushchenko struct xenbus_device *xb_dev = front_info->xb_dev;
52c575b7eeSOleksandr Andrushchenko int ret, i;
53c575b7eeSOleksandr Andrushchenko
54c575b7eeSOleksandr Andrushchenko if (xenbus_read_unsigned(front_info->xb_dev->nodename,
55c575b7eeSOleksandr Andrushchenko XENDISPL_FIELD_BE_ALLOC, 0)) {
56c575b7eeSOleksandr Andrushchenko DRM_INFO("Backend can provide display buffers\n");
57c575b7eeSOleksandr Andrushchenko cfg->be_alloc = true;
58c575b7eeSOleksandr Andrushchenko }
59c575b7eeSOleksandr Andrushchenko
60c575b7eeSOleksandr Andrushchenko cfg->num_connectors = 0;
61c575b7eeSOleksandr Andrushchenko for (i = 0; i < ARRAY_SIZE(cfg->connectors); i++) {
62c575b7eeSOleksandr Andrushchenko ret = cfg_connector(front_info, &cfg->connectors[i],
63c575b7eeSOleksandr Andrushchenko xb_dev->nodename, i);
64c575b7eeSOleksandr Andrushchenko if (ret < 0)
65c575b7eeSOleksandr Andrushchenko break;
66c575b7eeSOleksandr Andrushchenko cfg->num_connectors++;
67c575b7eeSOleksandr Andrushchenko }
68c575b7eeSOleksandr Andrushchenko
69c575b7eeSOleksandr Andrushchenko if (!cfg->num_connectors) {
70c575b7eeSOleksandr Andrushchenko DRM_ERROR("No connector(s) configured at %s\n",
71c575b7eeSOleksandr Andrushchenko xb_dev->nodename);
72c575b7eeSOleksandr Andrushchenko return -ENODEV;
73c575b7eeSOleksandr Andrushchenko }
74c575b7eeSOleksandr Andrushchenko
75c575b7eeSOleksandr Andrushchenko return 0;
76c575b7eeSOleksandr Andrushchenko }
77c575b7eeSOleksandr Andrushchenko
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