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