1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
4 */
5
6 #define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
7
8 #include <linux/slab.h>
9 #include <linux/device.h>
10
11 #include "dp_hpd.h"
12
13 /* DP specific VDM commands */
14 #define DP_USBPD_VDM_STATUS 0x10
15 #define DP_USBPD_VDM_CONFIGURE 0x11
16
17 /* USBPD-TypeC specific Macros */
18 #define VDM_VERSION 0x0
19 #define USB_C_DP_SID 0xFF01
20
21 struct dp_hpd_private {
22 struct device *dev;
23 struct dp_usbpd_cb *dp_cb;
24 struct dp_usbpd dp_usbpd;
25 };
26
dp_hpd_connect(struct dp_usbpd * dp_usbpd,bool hpd)27 int dp_hpd_connect(struct dp_usbpd *dp_usbpd, bool hpd)
28 {
29 int rc = 0;
30 struct dp_hpd_private *hpd_priv;
31
32 hpd_priv = container_of(dp_usbpd, struct dp_hpd_private,
33 dp_usbpd);
34
35 if (!hpd_priv->dp_cb || !hpd_priv->dp_cb->configure
36 || !hpd_priv->dp_cb->disconnect) {
37 pr_err("hpd dp_cb not initialized\n");
38 return -EINVAL;
39 }
40 if (hpd)
41 hpd_priv->dp_cb->configure(hpd_priv->dev);
42 else
43 hpd_priv->dp_cb->disconnect(hpd_priv->dev);
44
45 return rc;
46 }
47
dp_hpd_get(struct device * dev,struct dp_usbpd_cb * cb)48 struct dp_usbpd *dp_hpd_get(struct device *dev, struct dp_usbpd_cb *cb)
49 {
50 struct dp_hpd_private *dp_hpd;
51
52 if (!cb) {
53 pr_err("invalid cb data\n");
54 return ERR_PTR(-EINVAL);
55 }
56
57 dp_hpd = devm_kzalloc(dev, sizeof(*dp_hpd), GFP_KERNEL);
58 if (!dp_hpd)
59 return ERR_PTR(-ENOMEM);
60
61 dp_hpd->dev = dev;
62 dp_hpd->dp_cb = cb;
63
64 dp_hpd->dp_usbpd.connect = dp_hpd_connect;
65
66 return &dp_hpd->dp_usbpd;
67 }
68