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 #include <linux/mutex.h>
  19
  20 #include <drm/drm_edid.h>
  21
  22 #include "../dss/omapdss.h"
  23
  24 static const struct videomode hdmic_default_vm = {
  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         void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
  42         void *hpd_cb_data;
  43         bool hpd_enabled;
  44         struct mutex hpd_lock;
  45
  46         struct device *dev;
  47
  48         struct videomode vm;
  49
  50         int hpd_gpio;
  51 };
  52
  53 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  54
  55 static int hdmic_connect(struct omap_dss_device *dssdev)
  56 {
  57         struct panel_drv_data *ddata = to_panel_data(dssdev);
  58         struct omap_dss_device *in = ddata->in;
  59         int r;
  60
  61         dev_dbg(ddata->dev, "connect\n");
  62
  63         if (omapdss_device_is_connected(dssdev))
  64                 return 0;
  65
  66         r = in->ops.hdmi->connect(in, dssdev);
  67         if (r)
  68                 return r;
  69
  70         return 0;
  71 }
  72
  73 static void hdmic_disconnect(struct omap_dss_device *dssdev)
  74 {
  75         struct panel_drv_data *ddata = to_panel_data(dssdev);
  76         struct omap_dss_device *in = ddata->in;
  77
  78         dev_dbg(ddata->dev, "disconnect\n");
  79
  80         if (!omapdss_device_is_connected(dssdev))
  81                 return;
  82
  83         in->ops.hdmi->disconnect(in, dssdev);
  84 }
  85
  86 static int hdmic_enable(struct omap_dss_device *dssdev)
  87 {
  88         struct panel_drv_data *ddata = to_panel_data(dssdev);
  89         struct omap_dss_device *in = ddata->in;
  90         int r;
  91
  92         dev_dbg(ddata->dev, "enable\n");
  93
  94         if (!omapdss_device_is_connected(dssdev))
  95                 return -ENODEV;
  96
  97         if (omapdss_device_is_enabled(dssdev))
  98                 return 0;
  99
 100         in->ops.hdmi->set_timings(in, &ddata->vm);
 101
 102         r = in->ops.hdmi->enable(in);
 103         if (r)
 104                 return r;
 105
 106         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 107
 108         return r;
 109 }
 110
 111 static void hdmic_disable(struct omap_dss_device *dssdev)
 112 {
 113         struct panel_drv_data *ddata = to_panel_data(dssdev);
 114         struct omap_dss_device *in = ddata->in;
 115
 116         dev_dbg(ddata->dev, "disable\n");
 117
 118         if (!omapdss_device_is_enabled(dssdev))
 119                 return;
 120
 121         in->ops.hdmi->disable(in);
 122
 123         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 124 }
 125
 126 static void hdmic_set_timings(struct omap_dss_device *dssdev,
 127                               struct videomode *vm)
 128 {
 129         struct panel_drv_data *ddata = to_panel_data(dssdev);
 130         struct omap_dss_device *in = ddata->in;
 131
 132         ddata->vm = *vm;
 133         dssdev->panel.vm = *vm;
 134
 135         in->ops.hdmi->set_timings(in, vm);
 136 }
 137
 138 static void hdmic_get_timings(struct omap_dss_device *dssdev,
 139                               struct videomode *vm)
 140 {
 141         struct panel_drv_data *ddata = to_panel_data(dssdev);
 142
 143         *vm = ddata->vm;
 144 }
 145
 146 static int hdmic_check_timings(struct omap_dss_device *dssdev,
 147                                struct videomode *vm)
 148 {
 149         struct panel_drv_data *ddata = to_panel_data(dssdev);
 150         struct omap_dss_device *in = ddata->in;
 151
 152         return in->ops.hdmi->check_timings(in, vm);
 153 }
 154
 155 static int hdmic_read_edid(struct omap_dss_device *dssdev,
 156                 u8 *edid, int len)
 157 {
 158         struct panel_drv_data *ddata = to_panel_data(dssdev);
 159         struct omap_dss_device *in = ddata->in;
 160
 161         return in->ops.hdmi->read_edid(in, edid, len);
 162 }
 163
 164 static bool hdmic_detect(struct omap_dss_device *dssdev)
 165 {
 166         struct panel_drv_data *ddata = to_panel_data(dssdev);
 167         struct omap_dss_device *in = ddata->in;
 168
 169         if (gpio_is_valid(ddata->hpd_gpio))
 170                 return gpio_get_value_cansleep(ddata->hpd_gpio);
 171         else
 172                 return in->ops.hdmi->detect(in);
 173 }
 174
 175 static int hdmic_register_hpd_cb(struct omap_dss_device *dssdev,
 176                                  void (*cb)(void *cb_data,
 177                                             enum drm_connector_status status),
 178                                  void *cb_data)
 179 {
 180         struct panel_drv_data *ddata = to_panel_data(dssdev);
 181         struct omap_dss_device *in = ddata->in;
 182
 183         if (gpio_is_valid(ddata->hpd_gpio)) {
 184                 mutex_lock(&ddata->hpd_lock);
 185                 ddata->hpd_cb = cb;
 186                 ddata->hpd_cb_data = cb_data;
 187                 mutex_unlock(&ddata->hpd_lock);
 188                 return 0;
 189         } else if (in->ops.hdmi->register_hpd_cb) {
 190                 return in->ops.hdmi->register_hpd_cb(in, cb, cb_data);
 191         }
 192
 193         return -ENOTSUPP;
 194 }
 195
 196 static void hdmic_unregister_hpd_cb(struct omap_dss_device *dssdev)
 197 {
 198         struct panel_drv_data *ddata = to_panel_data(dssdev);
 199         struct omap_dss_device *in = ddata->in;
 200
 201         if (gpio_is_valid(ddata->hpd_gpio)) {
 202                 mutex_lock(&ddata->hpd_lock);
 203                 ddata->hpd_cb = NULL;
 204                 ddata->hpd_cb_data = NULL;
 205                 mutex_unlock(&ddata->hpd_lock);
 206         } else if (in->ops.hdmi->unregister_hpd_cb) {
 207                 in->ops.hdmi->unregister_hpd_cb(in);
 208         }
 209 }
 210
 211 static void hdmic_enable_hpd(struct omap_dss_device *dssdev)
 212 {
 213         struct panel_drv_data *ddata = to_panel_data(dssdev);
 214         struct omap_dss_device *in = ddata->in;
 215
 216         if (gpio_is_valid(ddata->hpd_gpio)) {
 217                 mutex_lock(&ddata->hpd_lock);
 218                 ddata->hpd_enabled = true;
 219                 mutex_unlock(&ddata->hpd_lock);
 220         } else if (in->ops.hdmi->enable_hpd) {
 221                 in->ops.hdmi->enable_hpd(in);
 222         }
 223 }
 224
 225 static void hdmic_disable_hpd(struct omap_dss_device *dssdev)
 226 {
 227         struct panel_drv_data *ddata = to_panel_data(dssdev);
 228         struct omap_dss_device *in = ddata->in;
 229
 230         if (gpio_is_valid(ddata->hpd_gpio)) {
 231                 mutex_lock(&ddata->hpd_lock);
 232                 ddata->hpd_enabled = false;
 233                 mutex_unlock(&ddata->hpd_lock);
 234         } else if (in->ops.hdmi->disable_hpd) {
 235                 in->ops.hdmi->disable_hpd(in);
 236         }
 237 }
 238
 239 static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode)
 240 {
 241         struct panel_drv_data *ddata = to_panel_data(dssdev);
 242         struct omap_dss_device *in = ddata->in;
 243
 244         return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
 245 }
 246
 247 static int hdmic_set_infoframe(struct omap_dss_device *dssdev,
 248                 const struct hdmi_avi_infoframe *avi)
 249 {
 250         struct panel_drv_data *ddata = to_panel_data(dssdev);
 251         struct omap_dss_device *in = ddata->in;
 252
 253         return in->ops.hdmi->set_infoframe(in, avi);
 254 }
 255
 256 static struct omap_dss_driver hdmic_driver = {
 257         .connect                = hdmic_connect,
 258         .disconnect             = hdmic_disconnect,
 259
 260         .enable                 = hdmic_enable,
 261         .disable                = hdmic_disable,
 262
 263         .set_timings            = hdmic_set_timings,
 264         .get_timings            = hdmic_get_timings,
 265         .check_timings          = hdmic_check_timings,
 266
 267         .read_edid              = hdmic_read_edid,
 268         .detect                 = hdmic_detect,
 269         .register_hpd_cb        = hdmic_register_hpd_cb,
 270         .unregister_hpd_cb      = hdmic_unregister_hpd_cb,
 271         .enable_hpd             = hdmic_enable_hpd,
 272         .disable_hpd            = hdmic_disable_hpd,
 273         .set_hdmi_mode          = hdmic_set_hdmi_mode,
 274         .set_hdmi_infoframe     = hdmic_set_infoframe,
 275 };
 276
 277 static irqreturn_t hdmic_hpd_isr(int irq, void *data)
 278 {
 279         struct panel_drv_data *ddata = data;
 280
 281         mutex_lock(&ddata->hpd_lock);
 282         if (ddata->hpd_enabled && ddata->hpd_cb) {
 283                 enum drm_connector_status status;
 284
 285                 if (hdmic_detect(&ddata->dssdev))
 286                         status = connector_status_connected;
 287                 else
 288                         status = connector_status_disconnected;
 289
 290                 ddata->hpd_cb(ddata->hpd_cb_data, status);
 291         }
 292         mutex_unlock(&ddata->hpd_lock);
 293
 294         return IRQ_HANDLED;
 295 }
 296
 297 static int hdmic_probe_of(struct platform_device *pdev)
 298 {
 299         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 300         struct device_node *node = pdev->dev.of_node;
 301         struct omap_dss_device *in;
 302         int gpio;
 303
 304         /* HPD GPIO */
 305         gpio = of_get_named_gpio(node, "hpd-gpios", 0);
 306         if (gpio_is_valid(gpio))
 307                 ddata->hpd_gpio = gpio;
 308         else
 309                 ddata->hpd_gpio = -ENODEV;
 310
 311         in = omapdss_of_find_source_for_first_ep(node);
 312         if (IS_ERR(in)) {
 313                 dev_err(&pdev->dev, "failed to find video source\n");
 314                 return PTR_ERR(in);
 315         }
 316
 317         ddata->in = in;
 318
 319         return 0;
 320 }
 321
 322 static int hdmic_probe(struct platform_device *pdev)
 323 {
 324         struct panel_drv_data *ddata;
 325         struct omap_dss_device *dssdev;
 326         int r;
 327
 328         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 329         if (!ddata)
 330                 return -ENOMEM;
 331
 332         platform_set_drvdata(pdev, ddata);
 333         ddata->dev = &pdev->dev;
 334
 335         if (!pdev->dev.of_node)
 336                 return -ENODEV;
 337
 338         r = hdmic_probe_of(pdev);
 339         if (r)
 340                 return r;
 341
 342         mutex_init(&ddata->hpd_lock);
 343
 344         if (gpio_is_valid(ddata->hpd_gpio)) {
 345                 r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
 346                                 GPIOF_DIR_IN, "hdmi_hpd");
 347                 if (r)
 348                         goto err_reg;
 349
 350                 r = devm_request_threaded_irq(&pdev->dev,
 351                                 gpio_to_irq(ddata->hpd_gpio),
 352                                 NULL, hdmic_hpd_isr,
 353                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 354                                 IRQF_ONESHOT,
 355                                 "hdmic hpd", ddata);
 356                 if (r)
 357                         goto err_reg;
 358         }
 359
 360         ddata->vm = hdmic_default_vm;
 361
 362         dssdev = &ddata->dssdev;
 363         dssdev->driver = &hdmic_driver;
 364         dssdev->dev = &pdev->dev;
 365         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 366         dssdev->owner = THIS_MODULE;
 367         dssdev->panel.vm = hdmic_default_vm;
 368
 369         r = omapdss_register_display(dssdev);
 370         if (r) {
 371                 dev_err(&pdev->dev, "Failed to register panel\n");
 372                 goto err_reg;
 373         }
 374
 375         return 0;
 376 err_reg:
 377         omap_dss_put_device(ddata->in);
 378         return r;
 379 }
 380
 381 static int __exit hdmic_remove(struct platform_device *pdev)
 382 {
 383         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 384         struct omap_dss_device *dssdev = &ddata->dssdev;
 385         struct omap_dss_device *in = ddata->in;
 386
 387         omapdss_unregister_display(&ddata->dssdev);
 388
 389         hdmic_disable(dssdev);
 390         hdmic_disconnect(dssdev);
 391
 392         omap_dss_put_device(in);
 393
 394         return 0;
 395 }
 396
 397 static const struct of_device_id hdmic_of_match[] = {
 398         { .compatible = "omapdss,hdmi-connector", },
 399         {},
 400 };
 401
 402 MODULE_DEVICE_TABLE(of, hdmic_of_match);
 403
 404 static struct platform_driver hdmi_connector_driver = {
 405         .probe  = hdmic_probe,
 406         .remove = __exit_p(hdmic_remove),
 407         .driver = {
 408                 .name   = "connector-hdmi",
 409                 .of_match_table = hdmic_of_match,
 410                 .suppress_bind_attrs = true,
 411         },
 412 };
 413
 414 module_platform_driver(hdmi_connector_driver);
 415
 416 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 417 MODULE_DESCRIPTION("HDMI Connector driver");
 418 MODULE_LICENSE("GPL");