1 /* 2 * HDMI Connector driver 3 * 4 * Copyright (C) 2013 Texas Instruments 5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 */ 11 12 #include <linux/slab.h> 13 #include <linux/module.h> 14 #include <linux/platform_device.h> 15 #include <linux/of.h> 16 #include <linux/of_gpio.h> 17 18 #include <drm/drm_edid.h> 19 20 #include <video/omapfb_dss.h> 21 22 static const struct omap_video_timings hdmic_default_timings = { 23 .x_res = 640, 24 .y_res = 480, 25 .pixelclock = 25175000, 26 .hsw = 96, 27 .hfp = 16, 28 .hbp = 48, 29 .vsw = 2, 30 .vfp = 11, 31 .vbp = 31, 32 33 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW, 34 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW, 35 36 .interlace = false, 37 }; 38 39 struct panel_drv_data { 40 struct omap_dss_device dssdev; 41 struct omap_dss_device *in; 42 43 struct device *dev; 44 45 struct omap_video_timings timings; 46 47 int hpd_gpio; 48 }; 49 50 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev) 51 52 static int hdmic_connect(struct omap_dss_device *dssdev) 53 { 54 struct panel_drv_data *ddata = to_panel_data(dssdev); 55 struct omap_dss_device *in = ddata->in; 56 int r; 57 58 dev_dbg(ddata->dev, "connect\n"); 59 60 if (omapdss_device_is_connected(dssdev)) 61 return 0; 62 63 r = in->ops.hdmi->connect(in, dssdev); 64 if (r) 65 return r; 66 67 return 0; 68 } 69 70 static void hdmic_disconnect(struct omap_dss_device *dssdev) 71 { 72 struct panel_drv_data *ddata = to_panel_data(dssdev); 73 struct omap_dss_device *in = ddata->in; 74 75 dev_dbg(ddata->dev, "disconnect\n"); 76 77 if (!omapdss_device_is_connected(dssdev)) 78 return; 79 80 in->ops.hdmi->disconnect(in, dssdev); 81 } 82 83 static int hdmic_enable(struct omap_dss_device *dssdev) 84 { 85 struct panel_drv_data *ddata = to_panel_data(dssdev); 86 struct omap_dss_device *in = ddata->in; 87 int r; 88 89 dev_dbg(ddata->dev, "enable\n"); 90 91 if (!omapdss_device_is_connected(dssdev)) 92 return -ENODEV; 93 94 if (omapdss_device_is_enabled(dssdev)) 95 return 0; 96 97 in->ops.hdmi->set_timings(in, &ddata->timings); 98 99 r = in->ops.hdmi->enable(in); 100 if (r) 101 return r; 102 103 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; 104 105 return r; 106 } 107 108 static void hdmic_disable(struct omap_dss_device *dssdev) 109 { 110 struct panel_drv_data *ddata = to_panel_data(dssdev); 111 struct omap_dss_device *in = ddata->in; 112 113 dev_dbg(ddata->dev, "disable\n"); 114 115 if (!omapdss_device_is_enabled(dssdev)) 116 return; 117 118 in->ops.hdmi->disable(in); 119 120 dssdev->state = OMAP_DSS_DISPLAY_DISABLED; 121 } 122 123 static void hdmic_set_timings(struct omap_dss_device *dssdev, 124 struct omap_video_timings *timings) 125 { 126 struct panel_drv_data *ddata = to_panel_data(dssdev); 127 struct omap_dss_device *in = ddata->in; 128 129 ddata->timings = *timings; 130 dssdev->panel.timings = *timings; 131 132 in->ops.hdmi->set_timings(in, timings); 133 } 134 135 static void hdmic_get_timings(struct omap_dss_device *dssdev, 136 struct omap_video_timings *timings) 137 { 138 struct panel_drv_data *ddata = to_panel_data(dssdev); 139 140 *timings = ddata->timings; 141 } 142 143 static int hdmic_check_timings(struct omap_dss_device *dssdev, 144 struct omap_video_timings *timings) 145 { 146 struct panel_drv_data *ddata = to_panel_data(dssdev); 147 struct omap_dss_device *in = ddata->in; 148 149 return in->ops.hdmi->check_timings(in, timings); 150 } 151 152 static int hdmic_read_edid(struct omap_dss_device *dssdev, 153 u8 *edid, int len) 154 { 155 struct panel_drv_data *ddata = to_panel_data(dssdev); 156 struct omap_dss_device *in = ddata->in; 157 158 return in->ops.hdmi->read_edid(in, edid, len); 159 } 160 161 static bool hdmic_detect(struct omap_dss_device *dssdev) 162 { 163 struct panel_drv_data *ddata = to_panel_data(dssdev); 164 struct omap_dss_device *in = ddata->in; 165 166 if (gpio_is_valid(ddata->hpd_gpio)) 167 return gpio_get_value_cansleep(ddata->hpd_gpio); 168 else 169 return in->ops.hdmi->detect(in); 170 } 171 172 static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode) 173 { 174 struct panel_drv_data *ddata = to_panel_data(dssdev); 175 struct omap_dss_device *in = ddata->in; 176 177 return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode); 178 } 179 180 static int hdmic_set_infoframe(struct omap_dss_device *dssdev, 181 const struct hdmi_avi_infoframe *avi) 182 { 183 struct panel_drv_data *ddata = to_panel_data(dssdev); 184 struct omap_dss_device *in = ddata->in; 185 186 return in->ops.hdmi->set_infoframe(in, avi); 187 } 188 189 static struct omap_dss_driver hdmic_driver = { 190 .connect = hdmic_connect, 191 .disconnect = hdmic_disconnect, 192 193 .enable = hdmic_enable, 194 .disable = hdmic_disable, 195 196 .set_timings = hdmic_set_timings, 197 .get_timings = hdmic_get_timings, 198 .check_timings = hdmic_check_timings, 199 200 .get_resolution = omapdss_default_get_resolution, 201 202 .read_edid = hdmic_read_edid, 203 .detect = hdmic_detect, 204 .set_hdmi_mode = hdmic_set_hdmi_mode, 205 .set_hdmi_infoframe = hdmic_set_infoframe, 206 }; 207 208 static int hdmic_probe_of(struct platform_device *pdev) 209 { 210 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 211 struct device_node *node = pdev->dev.of_node; 212 struct omap_dss_device *in; 213 int gpio; 214 215 /* HPD GPIO */ 216 gpio = of_get_named_gpio(node, "hpd-gpios", 0); 217 if (gpio_is_valid(gpio)) 218 ddata->hpd_gpio = gpio; 219 else 220 ddata->hpd_gpio = -ENODEV; 221 222 in = omapdss_of_find_source_for_first_ep(node); 223 if (IS_ERR(in)) { 224 dev_err(&pdev->dev, "failed to find video source\n"); 225 return PTR_ERR(in); 226 } 227 228 ddata->in = in; 229 230 return 0; 231 } 232 233 static int hdmic_probe(struct platform_device *pdev) 234 { 235 struct panel_drv_data *ddata; 236 struct omap_dss_device *dssdev; 237 int r; 238 239 if (!pdev->dev.of_node) 240 return -ENODEV; 241 242 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 243 if (!ddata) 244 return -ENOMEM; 245 246 platform_set_drvdata(pdev, ddata); 247 ddata->dev = &pdev->dev; 248 249 r = hdmic_probe_of(pdev); 250 if (r) 251 return r; 252 253 if (gpio_is_valid(ddata->hpd_gpio)) { 254 r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio, 255 GPIOF_DIR_IN, "hdmi_hpd"); 256 if (r) 257 goto err_reg; 258 } 259 260 ddata->timings = hdmic_default_timings; 261 262 dssdev = &ddata->dssdev; 263 dssdev->driver = &hdmic_driver; 264 dssdev->dev = &pdev->dev; 265 dssdev->type = OMAP_DISPLAY_TYPE_HDMI; 266 dssdev->owner = THIS_MODULE; 267 dssdev->panel.timings = hdmic_default_timings; 268 269 r = omapdss_register_display(dssdev); 270 if (r) { 271 dev_err(&pdev->dev, "Failed to register panel\n"); 272 goto err_reg; 273 } 274 275 return 0; 276 err_reg: 277 omap_dss_put_device(ddata->in); 278 return r; 279 } 280 281 static int __exit hdmic_remove(struct platform_device *pdev) 282 { 283 struct panel_drv_data *ddata = platform_get_drvdata(pdev); 284 struct omap_dss_device *dssdev = &ddata->dssdev; 285 struct omap_dss_device *in = ddata->in; 286 287 omapdss_unregister_display(&ddata->dssdev); 288 289 hdmic_disable(dssdev); 290 hdmic_disconnect(dssdev); 291 292 omap_dss_put_device(in); 293 294 return 0; 295 } 296 297 static const struct of_device_id hdmic_of_match[] = { 298 { .compatible = "omapdss,hdmi-connector", }, 299 {}, 300 }; 301 302 MODULE_DEVICE_TABLE(of, hdmic_of_match); 303 304 static struct platform_driver hdmi_connector_driver = { 305 .probe = hdmic_probe, 306 .remove = __exit_p(hdmic_remove), 307 .driver = { 308 .name = "connector-hdmi", 309 .of_match_table = hdmic_of_match, 310 .suppress_bind_attrs = true, 311 }, 312 }; 313 314 module_platform_driver(hdmi_connector_driver); 315 316 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 317 MODULE_DESCRIPTION("HDMI Connector driver"); 318 MODULE_LICENSE("GPL"); 319