drivers/gpu/drm/tilcdc/tilcdc_tfp410.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/i2c.h>
  19 #include <linux/gpio.h>
  20 #include <linux/of_gpio.h>
  21 #include <linux/pinctrl/pinmux.h>
  22 #include <linux/pinctrl/consumer.h>
  23 #include <drm/drm_atomic_helper.h>
  24
  25 #include "tilcdc_drv.h"
  26 #include "tilcdc_tfp410.h"
  27
  28 struct tfp410_module {
  29         struct tilcdc_module base;
  30         struct i2c_adapter *i2c;
  31         int gpio;
  32 };
  33 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
  34
  35
  36 static const struct tilcdc_panel_info dvi_info = {
  37                 .ac_bias                = 255,
  38                 .ac_bias_intrpt         = 0,
  39                 .dma_burst_sz           = 16,
  40                 .bpp                    = 16,
  41                 .fdd                    = 0x80,
  42                 .tft_alt_mode           = 0,
  43                 .sync_edge              = 0,
  44                 .sync_ctrl              = 1,
  45                 .raster_order           = 0,
  46 };
  47
  48 /*
  49  * Encoder:
  50  */
  51
  52 struct tfp410_encoder {
  53         struct drm_encoder base;
  54         struct tfp410_module *mod;
  55         int dpms;
  56 };
  57 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
  58
  59 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  60 {
  61         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  62
  63         if (tfp410_encoder->dpms == mode)
  64                 return;
  65
  66         if (mode == DRM_MODE_DPMS_ON) {
  67                 DBG("Power on");
  68                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  69         } else {
  70                 DBG("Power off");
  71                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  72         }
  73
  74         tfp410_encoder->dpms = mode;
  75 }
  76
  77 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  78 {
  79         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  80 }
  81
  82 static void tfp410_encoder_commit(struct drm_encoder *encoder)
  83 {
  84         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  85 }
  86
  87 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
  88                 struct drm_display_mode *mode,
  89                 struct drm_display_mode *adjusted_mode)
  90 {
  91         /* nothing needed */
  92 }
  93
  94 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
  95                 .destroy        = drm_encoder_cleanup,
  96 };
  97
  98 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
  99                 .dpms           = tfp410_encoder_dpms,
 100                 .prepare        = tfp410_encoder_prepare,
 101                 .commit         = tfp410_encoder_commit,
 102                 .mode_set       = tfp410_encoder_mode_set,
 103 };
 104
 105 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
 106                 struct tfp410_module *mod)
 107 {
 108         struct tfp410_encoder *tfp410_encoder;
 109         struct drm_encoder *encoder;
 110         int ret;
 111
 112         tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
 113                                       GFP_KERNEL);
 114         if (!tfp410_encoder)
 115                 return NULL;
 116
 117         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 118         tfp410_encoder->mod = mod;
 119
 120         encoder = &tfp410_encoder->base;
 121         encoder->possible_crtcs = 1;
 122
 123         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
 124                         DRM_MODE_ENCODER_TMDS, NULL);
 125         if (ret < 0)
 126                 goto fail;
 127
 128         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
 129
 130         return encoder;
 131
 132 fail:
 133         drm_encoder_cleanup(encoder);
 134         return NULL;
 135 }
 136
 137 /*
 138  * Connector:
 139  */
 140
 141 struct tfp410_connector {
 142         struct drm_connector base;
 143
 144         struct drm_encoder *encoder;  /* our connected encoder */
 145         struct tfp410_module *mod;
 146 };
 147 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
 148
 149
 150 static void tfp410_connector_destroy(struct drm_connector *connector)
 151 {
 152         drm_connector_unregister(connector);
 153         drm_connector_cleanup(connector);
 154 }
 155
 156 static enum drm_connector_status tfp410_connector_detect(
 157                 struct drm_connector *connector,
 158                 bool force)
 159 {
 160         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 161
 162         if (drm_probe_ddc(tfp410_connector->mod->i2c))
 163                 return connector_status_connected;
 164
 165         return connector_status_unknown;
 166 }
 167
 168 static int tfp410_connector_get_modes(struct drm_connector *connector)
 169 {
 170         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 171         struct edid *edid;
 172         int ret = 0;
 173
 174         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
 175
 176         drm_mode_connector_update_edid_property(connector, edid);
 177
 178         if (edid) {
 179                 ret = drm_add_edid_modes(connector, edid);
 180                 kfree(edid);
 181         }
 182
 183         return ret;
 184 }
 185
 186 static int tfp410_connector_mode_valid(struct drm_connector *connector,
 187                   struct drm_display_mode *mode)
 188 {
 189         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 190         /* our only constraints are what the crtc can generate: */
 191         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 192 }
 193
 194 static struct drm_encoder *tfp410_connector_best_encoder(
 195                 struct drm_connector *connector)
 196 {
 197         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 198         return tfp410_connector->encoder;
 199 }
 200
 201 static const struct drm_connector_funcs tfp410_connector_funcs = {
 202         .destroy            = tfp410_connector_destroy,
 203         .detect             = tfp410_connector_detect,
 204         .fill_modes         = drm_helper_probe_single_connector_modes,
 205         .reset              = drm_atomic_helper_connector_reset,
 206         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 207         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 208 };
 209
 210 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 211         .get_modes          = tfp410_connector_get_modes,
 212         .mode_valid         = tfp410_connector_mode_valid,
 213         .best_encoder       = tfp410_connector_best_encoder,
 214 };
 215
 216 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 217                 struct tfp410_module *mod, struct drm_encoder *encoder)
 218 {
 219         struct tfp410_connector *tfp410_connector;
 220         struct drm_connector *connector;
 221         int ret;
 222
 223         tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 224                                         GFP_KERNEL);
 225         if (!tfp410_connector)
 226                 return NULL;
 227
 228         tfp410_connector->encoder = encoder;
 229         tfp410_connector->mod = mod;
 230
 231         connector = &tfp410_connector->base;
 232
 233         drm_connector_init(dev, connector, &tfp410_connector_funcs,
 234                         DRM_MODE_CONNECTOR_DVID);
 235         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 236
 237         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 238                         DRM_CONNECTOR_POLL_DISCONNECT;
 239
 240         connector->interlace_allowed = 0;
 241         connector->doublescan_allowed = 0;
 242
 243         ret = drm_mode_connector_attach_encoder(connector, encoder);
 244         if (ret)
 245                 goto fail;
 246
 247         return connector;
 248
 249 fail:
 250         tfp410_connector_destroy(connector);
 251         return NULL;
 252 }
 253
 254 /*
 255  * Module:
 256  */
 257
 258 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 259 {
 260         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 261         struct tilcdc_drm_private *priv = dev->dev_private;
 262         struct drm_encoder *encoder;
 263         struct drm_connector *connector;
 264
 265         encoder = tfp410_encoder_create(dev, tfp410_mod);
 266         if (!encoder)
 267                 return -ENOMEM;
 268
 269         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 270         if (!connector)
 271                 return -ENOMEM;
 272
 273         priv->encoders[priv->num_encoders++] = encoder;
 274         priv->connectors[priv->num_connectors++] = connector;
 275
 276         tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
 277         return 0;
 278 }
 279
 280 static const struct tilcdc_module_ops tfp410_module_ops = {
 281                 .modeset_init = tfp410_modeset_init,
 282 };
 283
 284 /*
 285  * Device:
 286  */
 287
 288 static int tfp410_probe(struct platform_device *pdev)
 289 {
 290         struct device_node *node = pdev->dev.of_node;
 291         struct device_node *i2c_node;
 292         struct tfp410_module *tfp410_mod;
 293         struct tilcdc_module *mod;
 294         struct pinctrl *pinctrl;
 295         uint32_t i2c_phandle;
 296         int ret = -EINVAL;
 297
 298         /* bail out early if no DT data: */
 299         if (!node) {
 300                 dev_err(&pdev->dev, "device-tree data is missing\n");
 301                 return -ENXIO;
 302         }
 303
 304         tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
 305         if (!tfp410_mod)
 306                 return -ENOMEM;
 307
 308         mod = &tfp410_mod->base;
 309         pdev->dev.platform_data = mod;
 310
 311         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 312
 313         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 314         if (IS_ERR(pinctrl))
 315                 dev_warn(&pdev->dev, "pins are not configured\n");
 316
 317         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 318                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 319                 goto fail;
 320         }
 321
 322         i2c_node = of_find_node_by_phandle(i2c_phandle);
 323         if (!i2c_node) {
 324                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 325                 goto fail;
 326         }
 327
 328         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 329         if (!tfp410_mod->i2c) {
 330                 dev_err(&pdev->dev, "could not get i2c\n");
 331                 of_node_put(i2c_node);
 332                 goto fail;
 333         }
 334
 335         of_node_put(i2c_node);
 336
 337         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 338                         0, NULL);
 339         if (tfp410_mod->gpio < 0) {
 340                 dev_warn(&pdev->dev, "No power down GPIO\n");
 341         } else {
 342                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 343                 if (ret) {
 344                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 345                         goto fail_adapter;
 346                 }
 347         }
 348
 349         return 0;
 350
 351 fail_adapter:
 352         i2c_put_adapter(tfp410_mod->i2c);
 353
 354 fail:
 355         tilcdc_module_cleanup(mod);
 356         return ret;
 357 }
 358
 359 static int tfp410_remove(struct platform_device *pdev)
 360 {
 361         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 362         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 363
 364         i2c_put_adapter(tfp410_mod->i2c);
 365         gpio_free(tfp410_mod->gpio);
 366
 367         tilcdc_module_cleanup(mod);
 368
 369         return 0;
 370 }
 371
 372 static const struct of_device_id tfp410_of_match[] = {
 373                 { .compatible = "ti,tilcdc,tfp410", },
 374                 { },
 375 };
 376
 377 struct platform_driver tfp410_driver = {
 378         .probe = tfp410_probe,
 379         .remove = tfp410_remove,
 380         .driver = {
 381                 .owner = THIS_MODULE,
 382                 .name = "tfp410",
 383                 .of_match_table = tfp410_of_match,
 384         },
 385 };
 386
 387 int __init tilcdc_tfp410_init(void)
 388 {
 389         return platform_driver_register(&tfp410_driver);
 390 }
 391
 392 void __exit tilcdc_tfp410_fini(void)
 393 {
 394         platform_driver_unregister(&tfp410_driver);
 395 }