drm/udl/udl_connector.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2012 Red Hat
0004  * based in parts on udlfb.c:
0005  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
0006  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
0007  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
0008  */
0009
0010 #include <drm/drm_atomic_state_helper.h>
0011 #include <drm/drm_edid.h>
0012 #include <drm/drm_crtc_helper.h>
0013 #include <drm/drm_probe_helper.h>
0014
0015 #include "udl_connector.h"
0016 #include "udl_drv.h"
0017
0018 static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
0019                    size_t len)
0020 {
0021     int ret, i;
0022     u8 *read_buff;
0023     struct udl_device *udl = data;
0024     struct usb_device *udev = udl_to_usb_device(udl);
0025
0026     read_buff = kmalloc(2, GFP_KERNEL);
0027     if (!read_buff)
0028         return -1;
0029
0030     for (i = 0; i < len; i++) {
0031         int bval = (i + block * EDID_LENGTH) << 8;
0032         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
0033                       0x02, (0x80 | (0x02 << 5)), bval,
0034                       0xA1, read_buff, 2, 1000);
0035         if (ret < 1) {
0036             DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
0037             kfree(read_buff);
0038             return -1;
0039         }
0040         buf[i] = read_buff[1];
0041     }
0042
0043     kfree(read_buff);
0044     return 0;
0045 }
0046
0047 static int udl_get_modes(struct drm_connector *connector)
0048 {
0049     struct udl_drm_connector *udl_connector =
0050                     container_of(connector,
0051                     struct udl_drm_connector,
0052                     connector);
0053
0054     drm_connector_update_edid_property(connector, udl_connector->edid);
0055     if (udl_connector->edid)
0056         return drm_add_edid_modes(connector, udl_connector->edid);
0057     return 0;
0058 }
0059
0060 static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
0061               struct drm_display_mode *mode)
0062 {
0063     struct udl_device *udl = to_udl(connector->dev);
0064     if (!udl->sku_pixel_limit)
0065         return 0;
0066
0067     if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
0068         return MODE_VIRTUAL_Y;
0069
0070     return 0;
0071 }
0072
0073 static enum drm_connector_status
0074 udl_detect(struct drm_connector *connector, bool force)
0075 {
0076     struct udl_device *udl = to_udl(connector->dev);
0077     struct udl_drm_connector *udl_connector =
0078                     container_of(connector,
0079                     struct udl_drm_connector,
0080                     connector);
0081
0082     /* cleanup previous edid */
0083     if (udl_connector->edid != NULL) {
0084         kfree(udl_connector->edid);
0085         udl_connector->edid = NULL;
0086     }
0087
0088     udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
0089     if (!udl_connector->edid)
0090         return connector_status_disconnected;
0091
0092     return connector_status_connected;
0093 }
0094
0095 static void udl_connector_destroy(struct drm_connector *connector)
0096 {
0097     struct udl_drm_connector *udl_connector =
0098                     container_of(connector,
0099                     struct udl_drm_connector,
0100                     connector);
0101
0102     drm_connector_cleanup(connector);
0103     kfree(udl_connector->edid);
0104     kfree(connector);
0105 }
0106
0107 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
0108     .get_modes = udl_get_modes,
0109     .mode_valid = udl_mode_valid,
0110 };
0111
0112 static const struct drm_connector_funcs udl_connector_funcs = {
0113     .reset = drm_atomic_helper_connector_reset,
0114     .detect = udl_detect,
0115     .fill_modes = drm_helper_probe_single_connector_modes,
0116     .destroy = udl_connector_destroy,
0117     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
0118     .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
0119 };
0120
0121 struct drm_connector *udl_connector_init(struct drm_device *dev)
0122 {
0123     struct udl_drm_connector *udl_connector;
0124     struct drm_connector *connector;
0125
0126     udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
0127     if (!udl_connector)
0128         return ERR_PTR(-ENOMEM);
0129
0130     connector = &udl_connector->connector;
0131     drm_connector_init(dev, connector, &udl_connector_funcs,
0132                DRM_MODE_CONNECTOR_VGA);
0133     drm_connector_helper_add(connector, &udl_connector_helper_funcs);
0134
0135     connector->polled = DRM_CONNECTOR_POLL_HPD |
0136         DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
0137
0138     return connector;
0139 }