1 /* $NetBSD: hdmi_connector.c,v 1.4 2021/12/19 11:01:10 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2019 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: hdmi_connector.c,v 1.4 2021/12/19 11:01:10 riastradh Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/device.h>
35 #include <sys/gpio.h>
36 #include <sys/systm.h>
37
38 #include <dev/fdt/fdt_port.h>
39 #include <dev/fdt/fdtvar.h>
40
41 #include <dev/i2c/ddcvar.h>
42
43 #include <drm/drm_crtc.h>
44 #include <drm/drm_crtc_helper.h>
45 #include <drm/drm_drv.h>
46 #include <drm/drm_edid.h>
47 #include <drm/drm_probe_helper.h>
48
49 static const struct device_compatible_entry compat_data[] = {
50 { .compat = "hdmi-connector" },
51 DEVICE_COMPAT_EOL
52 };
53
54 struct dispcon_hdmi_connector {
55 struct drm_connector base;
56 struct fdtbus_gpio_pin *hpd;
57 i2c_tag_t ddc;
58
59 int type; /* DRM_MODE_CONNECTOR_* */
60 };
61
62 struct dispcon_hdmi_softc {
63 struct fdt_device_ports sc_ports;
64 struct dispcon_hdmi_connector sc_connector;
65 };
66
67 #define to_dispcon_hdmi_connector(x) container_of(x, struct dispcon_hdmi_connector, base)
68
69 static enum drm_connector_status
dispcon_hdmi_connector_detect(struct drm_connector * connector,bool force)70 dispcon_hdmi_connector_detect(struct drm_connector *connector, bool force)
71 {
72 struct dispcon_hdmi_connector *hdmi_connector = to_dispcon_hdmi_connector(connector);
73 bool con;
74
75 if (hdmi_connector->hpd == NULL) {
76 /*
77 * No hotplug detect pin available. Assume that we are connected.
78 */
79 return connector_status_connected;
80 }
81
82 /*
83 * Read connect status from hotplug detect pin.
84 */
85 con = fdtbus_gpio_read(hdmi_connector->hpd);
86 if (con) {
87 return connector_status_connected;
88 } else {
89 return connector_status_disconnected;
90 }
91 }
92
93 static void
dispcon_hdmi_connector_destroy(struct drm_connector * connector)94 dispcon_hdmi_connector_destroy(struct drm_connector *connector)
95 {
96 drm_connector_unregister(connector);
97 drm_connector_cleanup(connector);
98 }
99
100 static const struct drm_connector_funcs dispcon_hdmi_connector_funcs = {
101 .dpms = drm_helper_connector_dpms,
102 .detect = dispcon_hdmi_connector_detect,
103 .fill_modes = drm_helper_probe_single_connector_modes,
104 .destroy = dispcon_hdmi_connector_destroy,
105 };
106
107 static int
dispcon_hdmi_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)108 dispcon_hdmi_connector_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode)
109 {
110 return MODE_OK;
111 }
112
113 static int
dispcon_hdmi_connector_get_modes(struct drm_connector * connector)114 dispcon_hdmi_connector_get_modes(struct drm_connector *connector)
115 {
116 struct dispcon_hdmi_connector *hdmi_connector = to_dispcon_hdmi_connector(connector);
117 char edid[EDID_LENGTH * 4];
118 struct edid *pedid = NULL;
119 int error, block;
120
121 if (hdmi_connector->ddc != NULL) {
122 memset(edid, 0, sizeof(edid));
123 for (block = 0; block < 4; block++) {
124 error = ddc_read_edid_block(hdmi_connector->ddc,
125 &edid[block * EDID_LENGTH], EDID_LENGTH, block);
126 if (error)
127 break;
128 if (block == 0) {
129 pedid = (struct edid *)edid;
130 if (edid[0x7e] == 0)
131 break;
132 }
133 }
134 }
135
136 drm_connector_update_edid_property(connector, pedid);
137 if (pedid == NULL)
138 return 0;
139
140 return drm_add_edid_modes(connector, pedid);
141 }
142
143 static const struct drm_connector_helper_funcs dispcon_hdmi_connector_helper_funcs = {
144 .mode_valid = dispcon_hdmi_connector_mode_valid,
145 .get_modes = dispcon_hdmi_connector_get_modes,
146 };
147
148 static int
dispcon_hdmi_ep_activate(device_t dev,struct fdt_endpoint * ep,bool activate)149 dispcon_hdmi_ep_activate(device_t dev, struct fdt_endpoint *ep, bool activate)
150 {
151 struct drm_connector *connector = fdt_endpoint_get_data(ep);
152 struct dispcon_hdmi_connector *hdmi_connector = to_dispcon_hdmi_connector(connector);
153 struct fdt_endpoint *rep = fdt_endpoint_remote(ep);
154 struct drm_encoder *encoder;
155
156 if (fdt_endpoint_port_index(ep) != 0)
157 return EINVAL;
158
159 if (fdt_endpoint_type(rep) != EP_DRM_ENCODER)
160 return EINVAL;
161
162 if (activate) {
163 encoder = fdt_endpoint_get_data(rep);
164
165 connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
166 connector->interlace_allowed = 0;
167 connector->doublescan_allowed = 0;
168
169 drm_connector_init(encoder->dev, connector, &dispcon_hdmi_connector_funcs,
170 hdmi_connector->type);
171 drm_connector_helper_add(connector, &dispcon_hdmi_connector_helper_funcs);
172 drm_connector_register(connector);
173 drm_connector_attach_encoder(connector, encoder);
174 }
175
176 return 0;
177 }
178
179 static void *
dispcon_hdmi_ep_get_data(device_t dev,struct fdt_endpoint * ep)180 dispcon_hdmi_ep_get_data(device_t dev, struct fdt_endpoint *ep)
181 {
182 struct dispcon_hdmi_softc * const sc = device_private(dev);
183
184 return &sc->sc_connector.base;
185 }
186
187 static int
dispcon_hdmi_match(device_t parent,cfdata_t cf,void * aux)188 dispcon_hdmi_match(device_t parent, cfdata_t cf, void *aux)
189 {
190 struct fdt_attach_args * const faa = aux;
191
192 return of_compatible_match(faa->faa_phandle, compat_data);
193 }
194
195 static void
dispcon_hdmi_attach(device_t parent,device_t self,void * aux)196 dispcon_hdmi_attach(device_t parent, device_t self, void *aux)
197 {
198 struct dispcon_hdmi_softc * const sc = device_private(self);
199 struct dispcon_hdmi_connector * const hdmi_connector = &sc->sc_connector;
200 struct fdt_attach_args * const faa = aux;
201 const int phandle = faa->faa_phandle;
202
203 aprint_naive("\n");
204 aprint_normal(": HDMI connector\n");
205
206 hdmi_connector->type = DRM_MODE_CONNECTOR_HDMIA;
207 hdmi_connector->hpd = fdtbus_gpio_acquire(phandle, "hpd-gpios", GPIO_PIN_INPUT);
208 hdmi_connector->ddc = fdtbus_i2c_acquire(phandle, "ddc-i2c-bus");
209
210 sc->sc_ports.dp_ep_activate = dispcon_hdmi_ep_activate;
211 sc->sc_ports.dp_ep_get_data = dispcon_hdmi_ep_get_data;
212 fdt_ports_register(&sc->sc_ports, self, phandle, EP_DRM_CONNECTOR);
213 }
214
215 CFATTACH_DECL_NEW(dispcon_hdmi, sizeof(struct dispcon_hdmi_softc),
216 dispcon_hdmi_match, dispcon_hdmi_attach, NULL, NULL);
217