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