drivers/gpu/drm/omapdrm/displays/connector-hdmi.c

   1 /*
   2  * HDMI Connector driver
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
   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         bool connected;
 169
 170         if (gpio_is_valid(ddata->hpd_gpio))
 171                 connected = gpio_get_value_cansleep(ddata->hpd_gpio);
 172         else
 173                 connected = in->ops.hdmi->detect(in);
 174         if (!connected && in->ops.hdmi->lost_hotplug)
 175                 in->ops.hdmi->lost_hotplug(in);
 176         return connected;
 177 }
 178
 179 static int hdmic_register_hpd_cb(struct omap_dss_device *dssdev,
 180                                  void (*cb)(void *cb_data,
 181                                             enum drm_connector_status status),
 182                                  void *cb_data)
 183 {
 184         struct panel_drv_data *ddata = to_panel_data(dssdev);
 185         struct omap_dss_device *in = ddata->in;
 186
 187         if (gpio_is_valid(ddata->hpd_gpio)) {
 188                 mutex_lock(&ddata->hpd_lock);
 189                 ddata->hpd_cb = cb;
 190                 ddata->hpd_cb_data = cb_data;
 191                 mutex_unlock(&ddata->hpd_lock);
 192                 return 0;
 193         } else if (in->ops.hdmi->register_hpd_cb) {
 194                 return in->ops.hdmi->register_hpd_cb(in, cb, cb_data);
 195         }
 196
 197         return -ENOTSUPP;
 198 }
 199
 200 static void hdmic_unregister_hpd_cb(struct omap_dss_device *dssdev)
 201 {
 202         struct panel_drv_data *ddata = to_panel_data(dssdev);
 203         struct omap_dss_device *in = ddata->in;
 204
 205         if (gpio_is_valid(ddata->hpd_gpio)) {
 206                 mutex_lock(&ddata->hpd_lock);
 207                 ddata->hpd_cb = NULL;
 208                 ddata->hpd_cb_data = NULL;
 209                 mutex_unlock(&ddata->hpd_lock);
 210         } else if (in->ops.hdmi->unregister_hpd_cb) {
 211                 in->ops.hdmi->unregister_hpd_cb(in);
 212         }
 213 }
 214
 215 static void hdmic_enable_hpd(struct omap_dss_device *dssdev)
 216 {
 217         struct panel_drv_data *ddata = to_panel_data(dssdev);
 218         struct omap_dss_device *in = ddata->in;
 219
 220         if (gpio_is_valid(ddata->hpd_gpio)) {
 221                 mutex_lock(&ddata->hpd_lock);
 222                 ddata->hpd_enabled = true;
 223                 mutex_unlock(&ddata->hpd_lock);
 224         } else if (in->ops.hdmi->enable_hpd) {
 225                 in->ops.hdmi->enable_hpd(in);
 226         }
 227 }
 228
 229 static void hdmic_disable_hpd(struct omap_dss_device *dssdev)
 230 {
 231         struct panel_drv_data *ddata = to_panel_data(dssdev);
 232         struct omap_dss_device *in = ddata->in;
 233
 234         if (gpio_is_valid(ddata->hpd_gpio)) {
 235                 mutex_lock(&ddata->hpd_lock);
 236                 ddata->hpd_enabled = false;
 237                 mutex_unlock(&ddata->hpd_lock);
 238         } else if (in->ops.hdmi->disable_hpd) {
 239                 in->ops.hdmi->disable_hpd(in);
 240         }
 241 }
 242
 243 static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode)
 244 {
 245         struct panel_drv_data *ddata = to_panel_data(dssdev);
 246         struct omap_dss_device *in = ddata->in;
 247
 248         return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
 249 }
 250
 251 static int hdmic_set_infoframe(struct omap_dss_device *dssdev,
 252                 const struct hdmi_avi_infoframe *avi)
 253 {
 254         struct panel_drv_data *ddata = to_panel_data(dssdev);
 255         struct omap_dss_device *in = ddata->in;
 256
 257         return in->ops.hdmi->set_infoframe(in, avi);
 258 }
 259
 260 static struct omap_dss_driver hdmic_driver = {
 261         .connect                = hdmic_connect,
 262         .disconnect             = hdmic_disconnect,
 263
 264         .enable                 = hdmic_enable,
 265         .disable                = hdmic_disable,
 266
 267         .set_timings            = hdmic_set_timings,
 268         .get_timings            = hdmic_get_timings,
 269         .check_timings          = hdmic_check_timings,
 270
 271         .read_edid              = hdmic_read_edid,
 272         .detect                 = hdmic_detect,
 273         .register_hpd_cb        = hdmic_register_hpd_cb,
 274         .unregister_hpd_cb      = hdmic_unregister_hpd_cb,
 275         .enable_hpd             = hdmic_enable_hpd,
 276         .disable_hpd            = hdmic_disable_hpd,
 277         .set_hdmi_mode          = hdmic_set_hdmi_mode,
 278         .set_hdmi_infoframe     = hdmic_set_infoframe,
 279 };
 280
 281 static irqreturn_t hdmic_hpd_isr(int irq, void *data)
 282 {
 283         struct panel_drv_data *ddata = data;
 284
 285         mutex_lock(&ddata->hpd_lock);
 286         if (ddata->hpd_enabled && ddata->hpd_cb) {
 287                 enum drm_connector_status status;
 288
 289                 if (hdmic_detect(&ddata->dssdev))
 290                         status = connector_status_connected;
 291                 else
 292                         status = connector_status_disconnected;
 293
 294                 ddata->hpd_cb(ddata->hpd_cb_data, status);
 295         }
 296         mutex_unlock(&ddata->hpd_lock);
 297
 298         return IRQ_HANDLED;
 299 }
 300
 301 static int hdmic_probe_of(struct platform_device *pdev)
 302 {
 303         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 304         struct device_node *node = pdev->dev.of_node;
 305         struct omap_dss_device *in;
 306         int gpio;
 307
 308         /* HPD GPIO */
 309         gpio = of_get_named_gpio(node, "hpd-gpios", 0);
 310         if (gpio_is_valid(gpio))
 311                 ddata->hpd_gpio = gpio;
 312         else
 313                 ddata->hpd_gpio = -ENODEV;
 314
 315         in = omapdss_of_find_source_for_first_ep(node);
 316         if (IS_ERR(in)) {
 317                 dev_err(&pdev->dev, "failed to find video source\n");
 318                 return PTR_ERR(in);
 319         }
 320
 321         ddata->in = in;
 322
 323         return 0;
 324 }
 325
 326 static int hdmic_probe(struct platform_device *pdev)
 327 {
 328         struct panel_drv_data *ddata;
 329         struct omap_dss_device *dssdev;
 330         int r;
 331
 332         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 333         if (!ddata)
 334                 return -ENOMEM;
 335
 336         platform_set_drvdata(pdev, ddata);
 337         ddata->dev = &pdev->dev;
 338
 339         if (!pdev->dev.of_node)
 340                 return -ENODEV;
 341
 342         r = hdmic_probe_of(pdev);
 343         if (r)
 344                 return r;
 345
 346         mutex_init(&ddata->hpd_lock);
 347
 348         if (gpio_is_valid(ddata->hpd_gpio)) {
 349                 r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
 350                                 GPIOF_DIR_IN, "hdmi_hpd");
 351                 if (r)
 352                         goto err_reg;
 353
 354                 r = devm_request_threaded_irq(&pdev->dev,
 355                                 gpio_to_irq(ddata->hpd_gpio),
 356                                 NULL, hdmic_hpd_isr,
 357                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 358                                 IRQF_ONESHOT,
 359                                 "hdmic hpd", ddata);
 360                 if (r)
 361                         goto err_reg;
 362         }
 363
 364         ddata->vm = hdmic_default_vm;
 365
 366         dssdev = &ddata->dssdev;
 367         dssdev->driver = &hdmic_driver;
 368         dssdev->dev = &pdev->dev;
 369         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 370         dssdev->owner = THIS_MODULE;
 371         dssdev->panel.vm = hdmic_default_vm;
 372
 373         r = omapdss_register_display(dssdev);
 374         if (r) {
 375                 dev_err(&pdev->dev, "Failed to register panel\n");
 376                 goto err_reg;
 377         }
 378
 379         return 0;
 380 err_reg:
 381         omap_dss_put_device(ddata->in);
 382         return r;
 383 }
 384
 385 static int __exit hdmic_remove(struct platform_device *pdev)
 386 {
 387         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 388         struct omap_dss_device *dssdev = &ddata->dssdev;
 389         struct omap_dss_device *in = ddata->in;
 390
 391         omapdss_unregister_display(&ddata->dssdev);
 392
 393         hdmic_disable(dssdev);
 394         hdmic_disconnect(dssdev);
 395
 396         omap_dss_put_device(in);
 397
 398         return 0;
 399 }
 400
 401 static const struct of_device_id hdmic_of_match[] = {
 402         { .compatible = "omapdss,hdmi-connector", },
 403         {},
 404 };
 405
 406 MODULE_DEVICE_TABLE(of, hdmic_of_match);
 407
 408 static struct platform_driver hdmi_connector_driver = {
 409         .probe  = hdmic_probe,
 410         .remove = __exit_p(hdmic_remove),
 411         .driver = {
 412                 .name   = "connector-hdmi",
 413                 .of_match_table = hdmic_of_match,
 414                 .suppress_bind_attrs = true,
 415         },
 416 };
 417
 418 module_platform_driver(hdmi_connector_driver);
 419
 420 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 421 MODULE_DESCRIPTION("HDMI Connector driver");
 422 MODULE_LICENSE("GPL");