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