drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c

   1 /*
   2  * TPD12S015 HDMI ESD protection & level shifter chip 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/completion.h>
  13 #include <linux/delay.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/mutex.h>
  19
  20 #include "../dss/omapdss.h"
  21
  22 struct panel_drv_data {
  23         struct omap_dss_device dssdev;
  24         struct omap_dss_device *in;
  25         void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
  26         void *hpd_cb_data;
  27         bool hpd_enabled;
  28         struct mutex hpd_lock;
  29
  30         struct gpio_desc *ct_cp_hpd_gpio;
  31         struct gpio_desc *ls_oe_gpio;
  32         struct gpio_desc *hpd_gpio;
  33
  34         struct videomode vm;
  35 };
  36
  37 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
  38
  39 static int tpd_connect(struct omap_dss_device *dssdev,
  40                 struct omap_dss_device *dst)
  41 {
  42         struct panel_drv_data *ddata = to_panel_data(dssdev);
  43         struct omap_dss_device *in;
  44         int r;
  45
  46         in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
  47         if (IS_ERR(in)) {
  48                 dev_err(dssdev->dev, "failed to find video source\n");
  49                 return PTR_ERR(in);
  50         }
  51
  52         r = in->ops.hdmi->connect(in, dssdev);
  53         if (r) {
  54                 omap_dss_put_device(in);
  55                 return r;
  56         }
  57
  58         dst->src = dssdev;
  59         dssdev->dst = dst;
  60
  61         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
  62         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
  63
  64         /* DC-DC converter needs at max 300us to get to 90% of 5V */
  65         udelay(300);
  66
  67         ddata->in = in;
  68         return 0;
  69 }
  70
  71 static void tpd_disconnect(struct omap_dss_device *dssdev,
  72                 struct omap_dss_device *dst)
  73 {
  74         struct panel_drv_data *ddata = to_panel_data(dssdev);
  75         struct omap_dss_device *in = ddata->in;
  76
  77         WARN_ON(dst != dssdev->dst);
  78
  79         if (dst != dssdev->dst)
  80                 return;
  81
  82         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
  83         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
  84
  85         dst->src = NULL;
  86         dssdev->dst = NULL;
  87
  88         in->ops.hdmi->disconnect(in, &ddata->dssdev);
  89
  90         omap_dss_put_device(in);
  91         ddata->in = NULL;
  92 }
  93
  94 static int tpd_enable(struct omap_dss_device *dssdev)
  95 {
  96         struct panel_drv_data *ddata = to_panel_data(dssdev);
  97         struct omap_dss_device *in = ddata->in;
  98         int r;
  99
 100         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
 101                 return 0;
 102
 103         in->ops.hdmi->set_timings(in, &ddata->vm);
 104
 105         r = in->ops.hdmi->enable(in);
 106         if (r)
 107                 return r;
 108
 109         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
 110
 111         return r;
 112 }
 113
 114 static void tpd_disable(struct omap_dss_device *dssdev)
 115 {
 116         struct panel_drv_data *ddata = to_panel_data(dssdev);
 117         struct omap_dss_device *in = ddata->in;
 118
 119         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
 120                 return;
 121
 122         in->ops.hdmi->disable(in);
 123
 124         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
 125 }
 126
 127 static void tpd_set_timings(struct omap_dss_device *dssdev,
 128                             struct videomode *vm)
 129 {
 130         struct panel_drv_data *ddata = to_panel_data(dssdev);
 131         struct omap_dss_device *in = ddata->in;
 132
 133         ddata->vm = *vm;
 134         dssdev->panel.vm = *vm;
 135
 136         in->ops.hdmi->set_timings(in, vm);
 137 }
 138
 139 static void tpd_get_timings(struct omap_dss_device *dssdev,
 140                             struct videomode *vm)
 141 {
 142         struct panel_drv_data *ddata = to_panel_data(dssdev);
 143
 144         *vm = ddata->vm;
 145 }
 146
 147 static int tpd_check_timings(struct omap_dss_device *dssdev,
 148                              struct videomode *vm)
 149 {
 150         struct panel_drv_data *ddata = to_panel_data(dssdev);
 151         struct omap_dss_device *in = ddata->in;
 152         int r;
 153
 154         r = in->ops.hdmi->check_timings(in, vm);
 155
 156         return r;
 157 }
 158
 159 static int tpd_read_edid(struct omap_dss_device *dssdev,
 160                 u8 *edid, int len)
 161 {
 162         struct panel_drv_data *ddata = to_panel_data(dssdev);
 163         struct omap_dss_device *in = ddata->in;
 164
 165         if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
 166                 return -ENODEV;
 167
 168         return in->ops.hdmi->read_edid(in, edid, len);
 169 }
 170
 171 static bool tpd_detect(struct omap_dss_device *dssdev)
 172 {
 173         struct panel_drv_data *ddata = to_panel_data(dssdev);
 174         struct omap_dss_device *in = ddata->in;
 175         bool connected = gpiod_get_value_cansleep(ddata->hpd_gpio);
 176
 177         if (!connected && in->ops.hdmi->lost_hotplug)
 178                 in->ops.hdmi->lost_hotplug(in);
 179         return connected;
 180 }
 181
 182 static int tpd_register_hpd_cb(struct omap_dss_device *dssdev,
 183                                void (*cb)(void *cb_data,
 184                                           enum drm_connector_status status),
 185                                void *cb_data)
 186 {
 187         struct panel_drv_data *ddata = to_panel_data(dssdev);
 188
 189         mutex_lock(&ddata->hpd_lock);
 190         ddata->hpd_cb = cb;
 191         ddata->hpd_cb_data = cb_data;
 192         mutex_unlock(&ddata->hpd_lock);
 193
 194         return 0;
 195 }
 196
 197 static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
 198 {
 199         struct panel_drv_data *ddata = to_panel_data(dssdev);
 200
 201         mutex_lock(&ddata->hpd_lock);
 202         ddata->hpd_cb = NULL;
 203         ddata->hpd_cb_data = NULL;
 204         mutex_unlock(&ddata->hpd_lock);
 205 }
 206
 207 static void tpd_enable_hpd(struct omap_dss_device *dssdev)
 208 {
 209         struct panel_drv_data *ddata = to_panel_data(dssdev);
 210
 211         mutex_lock(&ddata->hpd_lock);
 212         ddata->hpd_enabled = true;
 213         mutex_unlock(&ddata->hpd_lock);
 214 }
 215
 216 static void tpd_disable_hpd(struct omap_dss_device *dssdev)
 217 {
 218         struct panel_drv_data *ddata = to_panel_data(dssdev);
 219
 220         mutex_lock(&ddata->hpd_lock);
 221         ddata->hpd_enabled = false;
 222         mutex_unlock(&ddata->hpd_lock);
 223 }
 224
 225 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
 226                 const struct hdmi_avi_infoframe *avi)
 227 {
 228         struct panel_drv_data *ddata = to_panel_data(dssdev);
 229         struct omap_dss_device *in = ddata->in;
 230
 231         return in->ops.hdmi->set_infoframe(in, avi);
 232 }
 233
 234 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
 235                 bool hdmi_mode)
 236 {
 237         struct panel_drv_data *ddata = to_panel_data(dssdev);
 238         struct omap_dss_device *in = ddata->in;
 239
 240         return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
 241 }
 242
 243 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
 244         .connect                = tpd_connect,
 245         .disconnect             = tpd_disconnect,
 246
 247         .enable                 = tpd_enable,
 248         .disable                = tpd_disable,
 249
 250         .check_timings          = tpd_check_timings,
 251         .set_timings            = tpd_set_timings,
 252         .get_timings            = tpd_get_timings,
 253
 254         .read_edid              = tpd_read_edid,
 255         .detect                 = tpd_detect,
 256         .register_hpd_cb        = tpd_register_hpd_cb,
 257         .unregister_hpd_cb      = tpd_unregister_hpd_cb,
 258         .enable_hpd             = tpd_enable_hpd,
 259         .disable_hpd            = tpd_disable_hpd,
 260         .set_infoframe          = tpd_set_infoframe,
 261         .set_hdmi_mode          = tpd_set_hdmi_mode,
 262 };
 263
 264 static irqreturn_t tpd_hpd_isr(int irq, void *data)
 265 {
 266         struct panel_drv_data *ddata = data;
 267
 268         mutex_lock(&ddata->hpd_lock);
 269         if (ddata->hpd_enabled && ddata->hpd_cb) {
 270                 enum drm_connector_status status;
 271
 272                 if (tpd_detect(&ddata->dssdev))
 273                         status = connector_status_connected;
 274                 else
 275                         status = connector_status_disconnected;
 276
 277                 ddata->hpd_cb(ddata->hpd_cb_data, status);
 278         }
 279         mutex_unlock(&ddata->hpd_lock);
 280
 281         return IRQ_HANDLED;
 282 }
 283
 284 static int tpd_probe(struct platform_device *pdev)
 285 {
 286         struct omap_dss_device *in, *dssdev;
 287         struct panel_drv_data *ddata;
 288         int r;
 289         struct gpio_desc *gpio;
 290
 291         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 292         if (!ddata)
 293                 return -ENOMEM;
 294
 295         platform_set_drvdata(pdev, ddata);
 296
 297         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
 298                  GPIOD_OUT_LOW);
 299         if (IS_ERR(gpio))
 300                 return PTR_ERR(gpio);
 301
 302         ddata->ct_cp_hpd_gpio = gpio;
 303
 304         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
 305                  GPIOD_OUT_LOW);
 306         if (IS_ERR(gpio))
 307                 return PTR_ERR(gpio);
 308
 309         ddata->ls_oe_gpio = gpio;
 310
 311         gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
 312                 GPIOD_IN);
 313         if (IS_ERR(gpio))
 314                 return PTR_ERR(gpio);
 315
 316         ddata->hpd_gpio = gpio;
 317
 318         mutex_init(&ddata->hpd_lock);
 319
 320         r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
 321                 NULL, tpd_hpd_isr,
 322                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 323                 "tpd12s015 hpd", ddata);
 324         if (r)
 325                 return r;
 326
 327         dssdev = &ddata->dssdev;
 328         dssdev->ops.hdmi = &tpd_hdmi_ops;
 329         dssdev->dev = &pdev->dev;
 330         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
 331         dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
 332         dssdev->owner = THIS_MODULE;
 333         dssdev->port_num = 1;
 334
 335         in = ddata->in;
 336
 337         r = omapdss_register_output(dssdev);
 338         if (r) {
 339                 dev_err(&pdev->dev, "Failed to register output\n");
 340                 return r;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static int __exit tpd_remove(struct platform_device *pdev)
 347 {
 348         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
 349         struct omap_dss_device *dssdev = &ddata->dssdev;
 350
 351         omapdss_unregister_output(&ddata->dssdev);
 352
 353         WARN_ON(omapdss_device_is_enabled(dssdev));
 354         if (omapdss_device_is_enabled(dssdev))
 355                 tpd_disable(dssdev);
 356
 357         WARN_ON(omapdss_device_is_connected(dssdev));
 358         if (omapdss_device_is_connected(dssdev))
 359                 tpd_disconnect(dssdev, dssdev->dst);
 360
 361         return 0;
 362 }
 363
 364 static const struct of_device_id tpd_of_match[] = {
 365         { .compatible = "omapdss,ti,tpd12s015", },
 366         {},
 367 };
 368
 369 MODULE_DEVICE_TABLE(of, tpd_of_match);
 370
 371 static struct platform_driver tpd_driver = {
 372         .probe  = tpd_probe,
 373         .remove = __exit_p(tpd_remove),
 374         .driver = {
 375                 .name   = "tpd12s015",
 376                 .of_match_table = tpd_of_match,
 377                 .suppress_bind_attrs = true,
 378         },
 379 };
 380
 381 module_platform_driver(tpd_driver);
 382
 383 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
 384 MODULE_DESCRIPTION("TPD12S015 driver");
 385 MODULE_LICENSE("GPL");