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 (at) 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 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 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 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 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 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 * 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 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 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
Indexes created Sat Sep 27 22:09:54 GMT 2025