drivers/video/fbdev/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 #include <linux/of_gpio.h>
  19
  20 #include <video/omapdss.h>
  21 #include <video/omap-panel-data.h>
  22
  23 struct panel_drv_data {
  24         struct omap_dss_device dssdev;
  25         struct omap_dss_device *in;
  26
  27         int ct_cp_hpd_gpio;
  28         int ls_oe_gpio;
  29         int hpd_gpio;
  30
  31         struct omap_video_timings timings;
  32
  33         struct completion hpd_completion;
  34 };
  35
  36 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  37
  38 static irqreturn_t tpd_hpd_irq_handler(int irq, void *data)
  39 {
  40         struct panel_drv_data *ddata = data;
  41         bool hpd;
  42
  43         hpd = gpio_get_value_cansleep(ddata->hpd_gpio);
  44
  45         dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd);
  46
  47         if (gpio_is_valid(ddata->ls_oe_gpio)) {
  48                 if (hpd)
  49                         gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);
  50                 else
  51                         gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);
  52         }
  53
  54         complete_all(&ddata->hpd_completion);
  55
  56         return IRQ_HANDLED;
  57 }
  58
  59 static int tpd_connect(struct omap_dss_device *dssdev,
  60                 struct omap_dss_device *dst)
  61 {
  62         struct panel_drv_data *ddata = to_panel_data(dssdev);
  63         struct omap_dss_device *in = ddata->in;
  64         int r;
  65
  66         r = in->ops.hdmi->connect(in, dssdev);
  67         if (r)
  68                 return r;
  69
  70         dst->src = dssdev;
  71         dssdev->dst = dst;
  72
  73         reinit_completion(&ddata->hpd_completion);
  74
  75         gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
  76         /* DC-DC converter needs at max 300us to get to 90% of 5V */
  77         udelay(300);
  78
  79         /*
  80          * If there's a cable connected, wait for the hpd irq to trigger,
  81          * which turns on the level shifters.
  82          */
  83         if (gpio_get_value_cansleep(ddata->hpd_gpio)) {
  84                 unsigned long to;
  85                 to = wait_for_completion_timeout(&ddata->hpd_completion,
  86                                 msecs_to_jiffies(250));
  87                 WARN_ON_ONCE(to == 0);
  88         }
  89
  90         return 0;
  91 }
  92
  93 static void tpd_disconnect(struct omap_dss_device *dssdev,
  94                 struct omap_dss_device *dst)
  95 {
  96         struct panel_drv_data *ddata = to_panel_data(dssdev);
  97         struct omap_dss_device *in = ddata->in;
  98
  99         WARN_ON(dst != dssdev->dst);
 100
 101         if (dst != dssdev->dst)
 102                 return;
 103
 104         gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
 105
 106         dst->src = NULL;
 107         dssdev->dst = NULL;
 108
 109         in->ops.hdmi->disconnect(in, &ddata->dssdev);
 110 }
 111
 112 static int tpd_enable(struct omap_dss_device *dssdev)
 113 {
 114         struct panel_drv_data *ddata = to_panel_data(dssdev);
 115         struct omap_dss_device *in = ddata->in;
 116         int r;
 117
 118         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 119                 return 0;
 120
 121         in->ops.hdmi->set_timings(in, &ddata->timings);
 122
 123         r = in->ops.hdmi->enable(in);
 124         if (r)
 125                 return r;
 126
 127         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 128
 129         return r;
 130 }
 131
 132 static void tpd_disable(struct omap_dss_device *dssdev)
 133 {
 134         struct panel_drv_data *ddata = to_panel_data(dssdev);
 135         struct omap_dss_device *in = ddata->in;
 136
 137         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 138                 return;
 139
 140         in->ops.hdmi->disable(in);
 141
 142         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 143 }
 144
 145 static void tpd_set_timings(struct omap_dss_device *dssdev,
 146                 struct omap_video_timings *timings)
 147 {
 148         struct panel_drv_data *ddata = to_panel_data(dssdev);
 149         struct omap_dss_device *in = ddata->in;
 150
 151         ddata->timings = *timings;
 152         dssdev->panel.timings = *timings;
 153
 154         in->ops.hdmi->set_timings(in, timings);
 155 }
 156
 157 static void tpd_get_timings(struct omap_dss_device *dssdev,
 158                 struct omap_video_timings *timings)
 159 {
 160         struct panel_drv_data *ddata = to_panel_data(dssdev);
 161
 162         *timings = ddata->timings;
 163 }
 164
 165 static int tpd_check_timings(struct omap_dss_device *dssdev,
 166                 struct omap_video_timings *timings)
 167 {
 168         struct panel_drv_data *ddata = to_panel_data(dssdev);
 169         struct omap_dss_device *in = ddata->in;
 170         int r;
 171
 172         r = in->ops.hdmi->check_timings(in, timings);
 173
 174         return r;
 175 }
 176
 177 static int tpd_read_edid(struct omap_dss_device *dssdev,
 178                 u8 *edid, int len)
 179 {
 180         struct panel_drv_data *ddata = to_panel_data(dssdev);
 181         struct omap_dss_device *in = ddata->in;
 182
 183         if (!gpio_get_value_cansleep(ddata->hpd_gpio))
 184                 return -ENODEV;
 185
 186         return in->ops.hdmi->read_edid(in, edid, len);
 187 }
 188
 189 static bool tpd_detect(struct omap_dss_device *dssdev)
 190 {
 191         struct panel_drv_data *ddata = to_panel_data(dssdev);
 192
 193         return gpio_get_value_cansleep(ddata->hpd_gpio);
 194 }
 195
 196 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
 197                 const struct hdmi_avi_infoframe *avi)
 198 {
 199         struct panel_drv_data *ddata = to_panel_data(dssdev);
 200         struct omap_dss_device *in = ddata->in;
 201
 202         return in->ops.hdmi->set_infoframe(in, avi);
 203 }
 204
 205 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
 206                 bool hdmi_mode)
 207 {
 208         struct panel_drv_data *ddata = to_panel_data(dssdev);
 209         struct omap_dss_device *in = ddata->in;
 210
 211         return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
 212 }
 213
 214 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
 215         .connect                = tpd_connect,
 216         .disconnect             = tpd_disconnect,
 217
 218         .enable                 = tpd_enable,
 219         .disable                = tpd_disable,
 220
 221         .check_timings          = tpd_check_timings,
 222         .set_timings            = tpd_set_timings,
 223         .get_timings            = tpd_get_timings,
 224
 225         .read_edid              = tpd_read_edid,
 226         .detect                 = tpd_detect,
 227         .set_infoframe          = tpd_set_infoframe,
 228         .set_hdmi_mode          = tpd_set_hdmi_mode,
 229 };
 230
 231 static int tpd_probe_pdata(struct platform_device *pdev)
 232 {
 233         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 234         struct encoder_tpd12s015_platform_data *pdata;
 235         struct omap_dss_device *dssdev, *in;
 236
 237         pdata = dev_get_platdata(&pdev->dev);
 238
 239         ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;
 240         ddata->ls_oe_gpio = pdata->ls_oe_gpio;
 241         ddata->hpd_gpio = pdata->hpd_gpio;
 242
 243         in = omap_dss_find_output(pdata->source);
 244         if (in == NULL) {
 245                 dev_err(&pdev->dev, "Failed to find video source\n");
 246                 return -ENODEV;
 247         }
 248
 249         ddata->in = in;
 250
 251         dssdev = &ddata->dssdev;
 252         dssdev->name = pdata->name;
 253
 254         return 0;
 255 }
 256
 257 static int tpd_probe_of(struct platform_device *pdev)
 258 {
 259         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 260         struct device_node *node = pdev->dev.of_node;
 261         struct omap_dss_device *in;
 262         int gpio;
 263
 264         /* CT CP HPD GPIO */
 265         gpio = of_get_gpio(node, 0);
 266         if (!gpio_is_valid(gpio)) {
 267                 dev_err(&pdev->dev, "failed to parse CT CP HPD gpio\n");
 268                 return gpio;
 269         }
 270         ddata->ct_cp_hpd_gpio = gpio;
 271
 272         /* LS OE GPIO */
 273         gpio = of_get_gpio(node, 1);
 274         if (gpio_is_valid(gpio) || gpio == -ENOENT) {
 275                 ddata->ls_oe_gpio = gpio;
 276         } else {
 277                 dev_err(&pdev->dev, "failed to parse LS OE gpio\n");
 278                 return gpio;
 279         }
 280
 281         /* HPD GPIO */
 282         gpio = of_get_gpio(node, 2);
 283         if (!gpio_is_valid(gpio)) {
 284                 dev_err(&pdev->dev, "failed to parse HPD gpio\n");
 285                 return gpio;
 286         }
 287         ddata->hpd_gpio = gpio;
 288
 289         in = omapdss_of_find_source_for_first_ep(node);
 290         if (IS_ERR(in)) {
 291                 dev_err(&pdev->dev, "failed to find video source\n");
 292                 return PTR_ERR(in);
 293         }
 294
 295         ddata->in = in;
 296
 297         return 0;
 298 }
 299
 300 static int tpd_probe(struct platform_device *pdev)
 301 {
 302         struct omap_dss_device *in, *dssdev;
 303         struct panel_drv_data *ddata;
 304         int r;
 305
 306         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 307         if (!ddata)
 308                 return -ENOMEM;
 309
 310         platform_set_drvdata(pdev, ddata);
 311
 312         init_completion(&ddata->hpd_completion);
 313
 314         if (dev_get_platdata(&pdev->dev)) {
 315                 r = tpd_probe_pdata(pdev);
 316                 if (r)
 317                         return r;
 318         } else if (pdev->dev.of_node) {
 319                 r = tpd_probe_of(pdev);
 320                 if (r)
 321                         return r;
 322         } else {
 323                 return -ENODEV;
 324         }
 325
 326         r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,
 327                         GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");
 328         if (r)
 329                 goto err_gpio;
 330
 331         if (gpio_is_valid(ddata->ls_oe_gpio)) {
 332                 r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,
 333                                 GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");
 334                 if (r)
 335                         goto err_gpio;
 336         }
 337
 338         r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
 339                         GPIOF_DIR_IN, "hdmi_hpd");
 340         if (r)
 341                 goto err_gpio;
 342
 343         r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio),
 344                                  NULL, tpd_hpd_irq_handler,
 345                                  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
 346                                  IRQF_ONESHOT, "hpd", ddata);
 347         if (r)
 348                 goto err_irq;
 349
 350         dssdev = &ddata->dssdev;
 351         dssdev->ops.hdmi = &tpd_hdmi_ops;
 352         dssdev->dev = &pdev->dev;
 353         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 354         dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
 355         dssdev->owner = THIS_MODULE;
 356         dssdev->port_num = 1;
 357
 358         in = ddata->in;
 359
 360         r = omapdss_register_output(dssdev);
 361         if (r) {
 362                 dev_err(&pdev->dev, "Failed to register output\n");
 363                 goto err_reg;
 364         }
 365
 366         return 0;
 367 err_reg:
 368 err_irq:
 369 err_gpio:
 370         omap_dss_put_device(ddata->in);
 371         return r;
 372 }
 373
 374 static int __exit tpd_remove(struct platform_device *pdev)
 375 {
 376         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 377         struct omap_dss_device *dssdev = &ddata->dssdev;
 378         struct omap_dss_device *in = ddata->in;
 379
 380         omapdss_unregister_output(&ddata->dssdev);
 381
 382         WARN_ON(omapdss_device_is_enabled(dssdev));
 383         if (omapdss_device_is_enabled(dssdev))
 384                 tpd_disable(dssdev);
 385
 386         WARN_ON(omapdss_device_is_connected(dssdev));
 387         if (omapdss_device_is_connected(dssdev))
 388                 tpd_disconnect(dssdev, dssdev->dst);
 389
 390         omap_dss_put_device(in);
 391
 392         return 0;
 393 }
 394
 395 static const struct of_device_id tpd_of_match[] = {
 396         { .compatible = "omapdss,ti,tpd12s015", },
 397         {},
 398 };
 399
 400 MODULE_DEVICE_TABLE(of, tpd_of_match);
 401
 402 static struct platform_driver tpd_driver = {
 403         .probe  = tpd_probe,
 404         .remove = __exit_p(tpd_remove),
 405         .driver = {
 406                 .name   = "tpd12s015",
 407                 .of_match_table = tpd_of_match,
 408                 .suppress_bind_attrs = true,
 409         },
 410 };
 411
 412 module_platform_driver(tpd_driver);
 413
 414 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 415 MODULE_DESCRIPTION("TPD12S015 driver");
 416 MODULE_LICENSE("GPL");