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
  24 #include "tilcdc_drv.h"
  25
  26 struct tfp410_module {
  27         struct tilcdc_module base;
  28         struct i2c_adapter *i2c;
  29         int gpio;
  30 };
  31 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
  32
  33
  34 static const struct tilcdc_panel_info dvi_info = {
  35                 .ac_bias                = 255,
  36                 .ac_bias_intrpt         = 0,
  37                 .dma_burst_sz           = 16,
  38                 .bpp                    = 16,
  39                 .fdd                    = 0x80,
  40                 .tft_alt_mode           = 0,
  41                 .sync_edge              = 0,
  42                 .sync_ctrl              = 1,
  43                 .raster_order           = 0,
  44 };
  45
  46 /*
  47  * Encoder:
  48  */
  49
  50 struct tfp410_encoder {
  51         struct drm_encoder base;
  52         struct tfp410_module *mod;
  53         int dpms;
  54 };
  55 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
  56
  57 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  58 {
  59         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  60
  61         if (tfp410_encoder->dpms == mode)
  62                 return;
  63
  64         if (mode == DRM_MODE_DPMS_ON) {
  65                 DBG("Power on");
  66                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  67         } else {
  68                 DBG("Power off");
  69                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  70         }
  71
  72         tfp410_encoder->dpms = mode;
  73 }
  74
  75 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  76 {
  77         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  78         tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
  79 }
  80
  81 static void tfp410_encoder_commit(struct drm_encoder *encoder)
  82 {
  83         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  84 }
  85
  86 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
  87                 struct drm_display_mode *mode,
  88                 struct drm_display_mode *adjusted_mode)
  89 {
  90         /* nothing needed */
  91 }
  92
  93 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
  94                 .destroy        = drm_encoder_cleanup,
  95 };
  96
  97 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
  98                 .dpms           = tfp410_encoder_dpms,
  99                 .prepare        = tfp410_encoder_prepare,
 100                 .commit         = tfp410_encoder_commit,
 101                 .mode_set       = tfp410_encoder_mode_set,
 102 };
 103
 104 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
 105                 struct tfp410_module *mod)
 106 {
 107         struct tfp410_encoder *tfp410_encoder;
 108         struct drm_encoder *encoder;
 109         int ret;
 110
 111         tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
 112                                       GFP_KERNEL);
 113         if (!tfp410_encoder) {
 114                 dev_err(dev->dev, "allocation failed\n");
 115                 return NULL;
 116         }
 117
 118         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 119         tfp410_encoder->mod = mod;
 120
 121         encoder = &tfp410_encoder->base;
 122         encoder->possible_crtcs = 1;
 123
 124         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
 125                         DRM_MODE_ENCODER_TMDS, NULL);
 126         if (ret < 0)
 127                 goto fail;
 128
 129         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
 130
 131         return encoder;
 132
 133 fail:
 134         drm_encoder_cleanup(encoder);
 135         return NULL;
 136 }
 137
 138 /*
 139  * Connector:
 140  */
 141
 142 struct tfp410_connector {
 143         struct drm_connector base;
 144
 145         struct drm_encoder *encoder;  /* our connected encoder */
 146         struct tfp410_module *mod;
 147 };
 148 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
 149
 150
 151 static void tfp410_connector_destroy(struct drm_connector *connector)
 152 {
 153         drm_connector_unregister(connector);
 154         drm_connector_cleanup(connector);
 155 }
 156
 157 static enum drm_connector_status tfp410_connector_detect(
 158                 struct drm_connector *connector,
 159                 bool force)
 160 {
 161         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 162
 163         if (drm_probe_ddc(tfp410_connector->mod->i2c))
 164                 return connector_status_connected;
 165
 166         return connector_status_unknown;
 167 }
 168
 169 static int tfp410_connector_get_modes(struct drm_connector *connector)
 170 {
 171         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 172         struct edid *edid;
 173         int ret = 0;
 174
 175         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
 176
 177         drm_mode_connector_update_edid_property(connector, edid);
 178
 179         if (edid) {
 180                 ret = drm_add_edid_modes(connector, edid);
 181                 kfree(edid);
 182         }
 183
 184         return ret;
 185 }
 186
 187 static int tfp410_connector_mode_valid(struct drm_connector *connector,
 188                   struct drm_display_mode *mode)
 189 {
 190         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 191         /* our only constraints are what the crtc can generate: */
 192         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 193 }
 194
 195 static struct drm_encoder *tfp410_connector_best_encoder(
 196                 struct drm_connector *connector)
 197 {
 198         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 199         return tfp410_connector->encoder;
 200 }
 201
 202 static const struct drm_connector_funcs tfp410_connector_funcs = {
 203         .destroy            = tfp410_connector_destroy,
 204         .dpms               = drm_helper_connector_dpms,
 205         .detect             = tfp410_connector_detect,
 206         .fill_modes         = drm_helper_probe_single_connector_modes,
 207 };
 208
 209 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 210         .get_modes          = tfp410_connector_get_modes,
 211         .mode_valid         = tfp410_connector_mode_valid,
 212         .best_encoder       = tfp410_connector_best_encoder,
 213 };
 214
 215 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 216                 struct tfp410_module *mod, struct drm_encoder *encoder)
 217 {
 218         struct tfp410_connector *tfp410_connector;
 219         struct drm_connector *connector;
 220         int ret;
 221
 222         tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 223                                         GFP_KERNEL);
 224         if (!tfp410_connector) {
 225                 dev_err(dev->dev, "allocation failed\n");
 226                 return NULL;
 227         }
 228
 229         tfp410_connector->encoder = encoder;
 230         tfp410_connector->mod = mod;
 231
 232         connector = &tfp410_connector->base;
 233
 234         drm_connector_init(dev, connector, &tfp410_connector_funcs,
 235                         DRM_MODE_CONNECTOR_DVID);
 236         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 237
 238         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 239                         DRM_CONNECTOR_POLL_DISCONNECT;
 240
 241         connector->interlace_allowed = 0;
 242         connector->doublescan_allowed = 0;
 243
 244         ret = drm_mode_connector_attach_encoder(connector, encoder);
 245         if (ret)
 246                 goto fail;
 247
 248         drm_connector_register(connector);
 249
 250         return connector;
 251
 252 fail:
 253         tfp410_connector_destroy(connector);
 254         return NULL;
 255 }
 256
 257 /*
 258  * Module:
 259  */
 260
 261 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 262 {
 263         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 264         struct tilcdc_drm_private *priv = dev->dev_private;
 265         struct drm_encoder *encoder;
 266         struct drm_connector *connector;
 267
 268         encoder = tfp410_encoder_create(dev, tfp410_mod);
 269         if (!encoder)
 270                 return -ENOMEM;
 271
 272         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 273         if (!connector)
 274                 return -ENOMEM;
 275
 276         priv->encoders[priv->num_encoders++] = encoder;
 277         priv->connectors[priv->num_connectors++] = connector;
 278
 279         return 0;
 280 }
 281
 282 static const struct tilcdc_module_ops tfp410_module_ops = {
 283                 .modeset_init = tfp410_modeset_init,
 284 };
 285
 286 /*
 287  * Device:
 288  */
 289
 290 static struct of_device_id tfp410_of_match[];
 291
 292 static int tfp410_probe(struct platform_device *pdev)
 293 {
 294         struct device_node *node = pdev->dev.of_node;
 295         struct device_node *i2c_node;
 296         struct tfp410_module *tfp410_mod;
 297         struct tilcdc_module *mod;
 298         struct pinctrl *pinctrl;
 299         uint32_t i2c_phandle;
 300         int ret = -EINVAL;
 301
 302         /* bail out early if no DT data: */
 303         if (!node) {
 304                 dev_err(&pdev->dev, "device-tree data is missing\n");
 305                 return -ENXIO;
 306         }
 307
 308         tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
 309         if (!tfp410_mod)
 310                 return -ENOMEM;
 311
 312         mod = &tfp410_mod->base;
 313         pdev->dev.platform_data = mod;
 314
 315         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 316
 317         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 318         if (IS_ERR(pinctrl))
 319                 dev_warn(&pdev->dev, "pins are not configured\n");
 320
 321         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 322                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 323                 goto fail;
 324         }
 325
 326         mod->preferred_bpp = dvi_info.bpp;
 327
 328         i2c_node = of_find_node_by_phandle(i2c_phandle);
 329         if (!i2c_node) {
 330                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 331                 goto fail;
 332         }
 333
 334         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 335         if (!tfp410_mod->i2c) {
 336                 dev_err(&pdev->dev, "could not get i2c\n");
 337                 of_node_put(i2c_node);
 338                 goto fail;
 339         }
 340
 341         of_node_put(i2c_node);
 342
 343         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 344                         0, NULL);
 345         if (tfp410_mod->gpio < 0) {
 346                 dev_warn(&pdev->dev, "No power down GPIO\n");
 347         } else {
 348                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 349                 if (ret) {
 350                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 351                         goto fail_adapter;
 352                 }
 353         }
 354
 355         return 0;
 356
 357 fail_adapter:
 358         i2c_put_adapter(tfp410_mod->i2c);
 359
 360 fail:
 361         tilcdc_module_cleanup(mod);
 362         return ret;
 363 }
 364
 365 static int tfp410_remove(struct platform_device *pdev)
 366 {
 367         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 368         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 369
 370         i2c_put_adapter(tfp410_mod->i2c);
 371         gpio_free(tfp410_mod->gpio);
 372
 373         tilcdc_module_cleanup(mod);
 374
 375         return 0;
 376 }
 377
 378 static struct of_device_id tfp410_of_match[] = {
 379                 { .compatible = "ti,tilcdc,tfp410", },
 380                 { },
 381 };
 382
 383 struct platform_driver tfp410_driver = {
 384         .probe = tfp410_probe,
 385         .remove = tfp410_remove,
 386         .driver = {
 387                 .owner = THIS_MODULE,
 388                 .name = "tfp410",
 389                 .of_match_table = tfp410_of_match,
 390         },
 391 };
 392
 393 int __init tilcdc_tfp410_init(void)
 394 {
 395         return platform_driver_register(&tfp410_driver);
 396 }
 397
 398 void __exit tilcdc_tfp410_fini(void)
 399 {
 400         platform_driver_unregister(&tfp410_driver);
 401 }