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