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         .vsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  36         .hsync_level    = OMAPDSS_SIG_ACTIVE_LOW,
  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         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 240         if (!ddata)
 241                 return -ENOMEM;
 242
 243         platform_set_drvdata(pdev, ddata);
 244         ddata->dev = &pdev->dev;
 245
 246         if (!pdev->dev.of_node)
 247                 return -ENODEV;
 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");