drivers/video/omap2/displays-new/encoder-tpd12s015.c

   1 /*
   2  * TPD12S015 HDMI ESD protection & level shifter chip 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/completion.h>
  13 #include <linux/delay.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/gpio.h>
  17 #include <linux/platform_device.h>
  18
  19 #include <video/omapdss.h>
  20 #include <video/omap-panel-data.h>
  21
  22 struct panel_drv_data {
  23         struct omap_dss_device dssdev;
  24         struct omap_dss_device *in;
  25
  26         int ct_cp_hpd_gpio;
  27         int ls_oe_gpio;
  28         int hpd_gpio;
  29
  30         struct omap_video_timings timings;
  31
  32         struct completion hpd_completion;
  33 };
  34
  35 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  36
  37 static irqreturn_t tpd_hpd_irq_handler(int irq, void *data)
  38 {
  39         struct panel_drv_data *ddata = data;
  40         bool hpd;
  41
  42         hpd = gpio_get_value_cansleep(ddata->hpd_gpio);
  43
  44         dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd);
  45
  46         if (gpio_is_valid(ddata->ls_oe_gpio)) {
  47                 if (hpd)
  48                         gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);
  49                 else
  50                         gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);
  51         }
  52
  53         complete_all(&ddata->hpd_completion);
  54
  55         return IRQ_HANDLED;
  56 }
  57
  58 static int tpd_connect(struct omap_dss_device *dssdev,
  59                 struct omap_dss_device *dst)
  60 {
  61         struct panel_drv_data *ddata = to_panel_data(dssdev);
  62         struct omap_dss_device *in = ddata->in;
  63         int r;
  64
  65         r = in->ops.hdmi->connect(in, dssdev);
  66         if (r)
  67                 return r;
  68
  69         dst->src = dssdev;
  70         dssdev->dst = dst;
  71
  72         reinit_completion(&ddata->hpd_completion);
  73
  74         gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
  75         /* DC-DC converter needs at max 300us to get to 90% of 5V */
  76         udelay(300);
  77
  78         /*
  79          * If there's a cable connected, wait for the hpd irq to trigger,
  80          * which turns on the level shifters.
  81          */
  82         if (gpio_get_value_cansleep(ddata->hpd_gpio)) {
  83                 unsigned long to;
  84                 to = wait_for_completion_timeout(&ddata->hpd_completion,
  85                                 msecs_to_jiffies(250));
  86                 WARN_ON_ONCE(to == 0);
  87         }
  88
  89         return 0;
  90 }
  91
  92 static void tpd_disconnect(struct omap_dss_device *dssdev,
  93                 struct omap_dss_device *dst)
  94 {
  95         struct panel_drv_data *ddata = to_panel_data(dssdev);
  96         struct omap_dss_device *in = ddata->in;
  97
  98         WARN_ON(dst != dssdev->dst);
  99
 100         if (dst != dssdev->dst)
 101                 return;
 102
 103         gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
 104
 105         dst->src = NULL;
 106         dssdev->dst = NULL;
 107
 108         in->ops.hdmi->disconnect(in, &ddata->dssdev);
 109 }
 110
 111 static int tpd_enable(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         int r;
 116
 117         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 118                 return 0;
 119
 120         in->ops.hdmi->set_timings(in, &ddata->timings);
 121
 122         r = in->ops.hdmi->enable(in);
 123         if (r)
 124                 return r;
 125
 126         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 127
 128         return r;
 129 }
 130
 131 static void tpd_disable(struct omap_dss_device *dssdev)
 132 {
 133         struct panel_drv_data *ddata = to_panel_data(dssdev);
 134         struct omap_dss_device *in = ddata->in;
 135
 136         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 137                 return;
 138
 139         in->ops.hdmi->disable(in);
 140
 141         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 142 }
 143
 144 static void tpd_set_timings(struct omap_dss_device *dssdev,
 145                 struct omap_video_timings *timings)
 146 {
 147         struct panel_drv_data *ddata = to_panel_data(dssdev);
 148         struct omap_dss_device *in = ddata->in;
 149
 150         ddata->timings = *timings;
 151         dssdev->panel.timings = *timings;
 152
 153         in->ops.hdmi->set_timings(in, timings);
 154 }
 155
 156 static void tpd_get_timings(struct omap_dss_device *dssdev,
 157                 struct omap_video_timings *timings)
 158 {
 159         struct panel_drv_data *ddata = to_panel_data(dssdev);
 160
 161         *timings = ddata->timings;
 162 }
 163
 164 static int tpd_check_timings(struct omap_dss_device *dssdev,
 165                 struct omap_video_timings *timings)
 166 {
 167         struct panel_drv_data *ddata = to_panel_data(dssdev);
 168         struct omap_dss_device *in = ddata->in;
 169         int r;
 170
 171         r = in->ops.hdmi->check_timings(in, timings);
 172
 173         return r;
 174 }
 175
 176 static int tpd_read_edid(struct omap_dss_device *dssdev,
 177                 u8 *edid, int len)
 178 {
 179         struct panel_drv_data *ddata = to_panel_data(dssdev);
 180         struct omap_dss_device *in = ddata->in;
 181
 182         if (!gpio_get_value_cansleep(ddata->hpd_gpio))
 183                 return -ENODEV;
 184
 185         return in->ops.hdmi->read_edid(in, edid, len);
 186 }
 187
 188 static bool tpd_detect(struct omap_dss_device *dssdev)
 189 {
 190         struct panel_drv_data *ddata = to_panel_data(dssdev);
 191
 192         return gpio_get_value_cansleep(ddata->hpd_gpio);
 193 }
 194
 195 static int tpd_audio_enable(struct omap_dss_device *dssdev)
 196 {
 197         struct panel_drv_data *ddata = to_panel_data(dssdev);
 198         struct omap_dss_device *in = ddata->in;
 199
 200         return in->ops.hdmi->audio_enable(in);
 201 }
 202
 203 static void tpd_audio_disable(struct omap_dss_device *dssdev)
 204 {
 205         struct panel_drv_data *ddata = to_panel_data(dssdev);
 206         struct omap_dss_device *in = ddata->in;
 207
 208         in->ops.hdmi->audio_disable(in);
 209 }
 210
 211 static int tpd_audio_start(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         return in->ops.hdmi->audio_start(in);
 217 }
 218
 219 static void tpd_audio_stop(struct omap_dss_device *dssdev)
 220 {
 221         struct panel_drv_data *ddata = to_panel_data(dssdev);
 222         struct omap_dss_device *in = ddata->in;
 223
 224         in->ops.hdmi->audio_stop(in);
 225 }
 226
 227 static bool tpd_audio_supported(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         return in->ops.hdmi->audio_supported(in);
 233 }
 234
 235 static int tpd_audio_config(struct omap_dss_device *dssdev,
 236                 struct omap_dss_audio *audio)
 237 {
 238         struct panel_drv_data *ddata = to_panel_data(dssdev);
 239         struct omap_dss_device *in = ddata->in;
 240
 241         return in->ops.hdmi->audio_config(in, audio);
 242 }
 243
 244 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
 245         .connect                = tpd_connect,
 246         .disconnect             = tpd_disconnect,
 247
 248         .enable                 = tpd_enable,
 249         .disable                = tpd_disable,
 250
 251         .check_timings          = tpd_check_timings,
 252         .set_timings            = tpd_set_timings,
 253         .get_timings            = tpd_get_timings,
 254
 255         .read_edid              = tpd_read_edid,
 256         .detect                 = tpd_detect,
 257
 258         .audio_enable           = tpd_audio_enable,
 259         .audio_disable          = tpd_audio_disable,
 260         .audio_start            = tpd_audio_start,
 261         .audio_stop             = tpd_audio_stop,
 262         .audio_supported        = tpd_audio_supported,
 263         .audio_config           = tpd_audio_config,
 264 };
 265
 266 static int tpd_probe_pdata(struct platform_device *pdev)
 267 {
 268         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 269         struct encoder_tpd12s015_platform_data *pdata;
 270         struct omap_dss_device *dssdev, *in;
 271
 272         pdata = dev_get_platdata(&pdev->dev);
 273
 274         ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;
 275         ddata->ls_oe_gpio = pdata->ls_oe_gpio;
 276         ddata->hpd_gpio = pdata->hpd_gpio;
 277
 278         in = omap_dss_find_output(pdata->source);
 279         if (in == NULL) {
 280                 dev_err(&pdev->dev, "Failed to find video source\n");
 281                 return -ENODEV;
 282         }
 283
 284         ddata->in = in;
 285
 286         dssdev = &ddata->dssdev;
 287         dssdev->name = pdata->name;
 288
 289         return 0;
 290 }
 291
 292 static int tpd_probe(struct platform_device *pdev)
 293 {
 294         struct omap_dss_device *in, *dssdev;
 295         struct panel_drv_data *ddata;
 296         int r;
 297
 298         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 299         if (!ddata)
 300                 return -ENOMEM;
 301
 302         platform_set_drvdata(pdev, ddata);
 303
 304         init_completion(&ddata->hpd_completion);
 305
 306         if (dev_get_platdata(&pdev->dev)) {
 307                 r = tpd_probe_pdata(pdev);
 308                 if (r)
 309                         return r;
 310         } else {
 311                 return -ENODEV;
 312         }
 313
 314         r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,
 315                         GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");
 316         if (r)
 317                 goto err_gpio;
 318
 319         if (gpio_is_valid(ddata->ls_oe_gpio)) {
 320                 r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,
 321                                 GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");
 322                 if (r)
 323                         goto err_gpio;
 324         }
 325
 326         r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
 327                         GPIOF_DIR_IN, "hdmi_hpd");
 328         if (r)
 329                 goto err_gpio;
 330
 331         r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio),
 332                                  NULL, tpd_hpd_irq_handler,
 333                                  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 334                                  IRQF_ONESHOT, "hpd", ddata);
 335         if (r)
 336                 goto err_irq;
 337
 338         dssdev = &ddata->dssdev;
 339         dssdev->ops.hdmi = &tpd_hdmi_ops;
 340         dssdev->dev = &pdev->dev;
 341         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 342         dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
 343         dssdev->owner = THIS_MODULE;
 344
 345         in = ddata->in;
 346
 347         r = omapdss_register_output(dssdev);
 348         if (r) {
 349                 dev_err(&pdev->dev, "Failed to register output\n");
 350                 goto err_reg;
 351         }
 352
 353         return 0;
 354 err_reg:
 355 err_irq:
 356 err_gpio:
 357         omap_dss_put_device(ddata->in);
 358         return r;
 359 }
 360
 361 static int __exit tpd_remove(struct platform_device *pdev)
 362 {
 363         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 364         struct omap_dss_device *dssdev = &ddata->dssdev;
 365         struct omap_dss_device *in = ddata->in;
 366
 367         omapdss_unregister_output(&ddata->dssdev);
 368
 369         WARN_ON(omapdss_device_is_enabled(dssdev));
 370         if (omapdss_device_is_enabled(dssdev))
 371                 tpd_disable(dssdev);
 372
 373         WARN_ON(omapdss_device_is_connected(dssdev));
 374         if (omapdss_device_is_connected(dssdev))
 375                 tpd_disconnect(dssdev, dssdev->dst);
 376
 377         omap_dss_put_device(in);
 378
 379         return 0;
 380 }
 381
 382 static struct platform_driver tpd_driver = {
 383         .probe  = tpd_probe,
 384         .remove = __exit_p(tpd_remove),
 385         .driver = {
 386                 .name   = "tpd12s015",
 387                 .owner  = THIS_MODULE,
 388         },
 389 };
 390
 391 module_platform_driver(tpd_driver);
 392
 393 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 394 MODULE_DESCRIPTION("TPD12S015 driver");
 395 MODULE_LICENSE("GPL");