drivers/gpu/drm/omapdrm/displays/connector-hdmi.c

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