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                 dev_err(dev->dev, "allocation failed\n");
 116                 return NULL;
 117         }
 118
 119         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 120         tfp410_encoder->mod = mod;
 121
 122         encoder = &tfp410_encoder->base;
 123         encoder->possible_crtcs = 1;
 124
 125         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
 126                         DRM_MODE_ENCODER_TMDS, NULL);
 127         if (ret < 0)
 128                 goto fail;
 129
 130         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
 131
 132         return encoder;
 133
 134 fail:
 135         drm_encoder_cleanup(encoder);
 136         return NULL;
 137 }
 138
 139 /*
 140  * Connector:
 141  */
 142
 143 struct tfp410_connector {
 144         struct drm_connector base;
 145
 146         struct drm_encoder *encoder;  /* our connected encoder */
 147         struct tfp410_module *mod;
 148 };
 149 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
 150
 151
 152 static void tfp410_connector_destroy(struct drm_connector *connector)
 153 {
 154         drm_connector_unregister(connector);
 155         drm_connector_cleanup(connector);
 156 }
 157
 158 static enum drm_connector_status tfp410_connector_detect(
 159                 struct drm_connector *connector,
 160                 bool force)
 161 {
 162         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 163
 164         if (drm_probe_ddc(tfp410_connector->mod->i2c))
 165                 return connector_status_connected;
 166
 167         return connector_status_unknown;
 168 }
 169
 170 static int tfp410_connector_get_modes(struct drm_connector *connector)
 171 {
 172         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 173         struct edid *edid;
 174         int ret = 0;
 175
 176         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
 177
 178         drm_mode_connector_update_edid_property(connector, edid);
 179
 180         if (edid) {
 181                 ret = drm_add_edid_modes(connector, edid);
 182                 kfree(edid);
 183         }
 184
 185         return ret;
 186 }
 187
 188 static int tfp410_connector_mode_valid(struct drm_connector *connector,
 189                   struct drm_display_mode *mode)
 190 {
 191         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 192         /* our only constraints are what the crtc can generate: */
 193         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 194 }
 195
 196 static struct drm_encoder *tfp410_connector_best_encoder(
 197                 struct drm_connector *connector)
 198 {
 199         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 200         return tfp410_connector->encoder;
 201 }
 202
 203 static const struct drm_connector_funcs tfp410_connector_funcs = {
 204         .destroy            = tfp410_connector_destroy,
 205         .detect             = tfp410_connector_detect,
 206         .fill_modes         = drm_helper_probe_single_connector_modes,
 207         .reset              = drm_atomic_helper_connector_reset,
 208         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 209         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 210 };
 211
 212 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 213         .get_modes          = tfp410_connector_get_modes,
 214         .mode_valid         = tfp410_connector_mode_valid,
 215         .best_encoder       = tfp410_connector_best_encoder,
 216 };
 217
 218 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 219                 struct tfp410_module *mod, struct drm_encoder *encoder)
 220 {
 221         struct tfp410_connector *tfp410_connector;
 222         struct drm_connector *connector;
 223         int ret;
 224
 225         tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 226                                         GFP_KERNEL);
 227         if (!tfp410_connector) {
 228                 dev_err(dev->dev, "allocation failed\n");
 229                 return NULL;
 230         }
 231
 232         tfp410_connector->encoder = encoder;
 233         tfp410_connector->mod = mod;
 234
 235         connector = &tfp410_connector->base;
 236
 237         drm_connector_init(dev, connector, &tfp410_connector_funcs,
 238                         DRM_MODE_CONNECTOR_DVID);
 239         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 240
 241         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 242                         DRM_CONNECTOR_POLL_DISCONNECT;
 243
 244         connector->interlace_allowed = 0;
 245         connector->doublescan_allowed = 0;
 246
 247         ret = drm_mode_connector_attach_encoder(connector, encoder);
 248         if (ret)
 249                 goto fail;
 250
 251         return connector;
 252
 253 fail:
 254         tfp410_connector_destroy(connector);
 255         return NULL;
 256 }
 257
 258 /*
 259  * Module:
 260  */
 261
 262 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 263 {
 264         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 265         struct tilcdc_drm_private *priv = dev->dev_private;
 266         struct drm_encoder *encoder;
 267         struct drm_connector *connector;
 268
 269         encoder = tfp410_encoder_create(dev, tfp410_mod);
 270         if (!encoder)
 271                 return -ENOMEM;
 272
 273         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 274         if (!connector)
 275                 return -ENOMEM;
 276
 277         priv->encoders[priv->num_encoders++] = encoder;
 278         priv->connectors[priv->num_connectors++] = connector;
 279
 280         tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
 281         return 0;
 282 }
 283
 284 static const struct tilcdc_module_ops tfp410_module_ops = {
 285                 .modeset_init = tfp410_modeset_init,
 286 };
 287
 288 /*
 289  * Device:
 290  */
 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         i2c_node = of_find_node_by_phandle(i2c_phandle);
 327         if (!i2c_node) {
 328                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 329                 goto fail;
 330         }
 331
 332         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 333         if (!tfp410_mod->i2c) {
 334                 dev_err(&pdev->dev, "could not get i2c\n");
 335                 of_node_put(i2c_node);
 336                 goto fail;
 337         }
 338
 339         of_node_put(i2c_node);
 340
 341         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 342                         0, NULL);
 343         if (tfp410_mod->gpio < 0) {
 344                 dev_warn(&pdev->dev, "No power down GPIO\n");
 345         } else {
 346                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 347                 if (ret) {
 348                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 349                         goto fail_adapter;
 350                 }
 351         }
 352
 353         return 0;
 354
 355 fail_adapter:
 356         i2c_put_adapter(tfp410_mod->i2c);
 357
 358 fail:
 359         tilcdc_module_cleanup(mod);
 360         return ret;
 361 }
 362
 363 static int tfp410_remove(struct platform_device *pdev)
 364 {
 365         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 366         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 367
 368         i2c_put_adapter(tfp410_mod->i2c);
 369         gpio_free(tfp410_mod->gpio);
 370
 371         tilcdc_module_cleanup(mod);
 372
 373         return 0;
 374 }
 375
 376 static const struct of_device_id tfp410_of_match[] = {
 377                 { .compatible = "ti,tilcdc,tfp410", },
 378                 { },
 379 };
 380
 381 struct platform_driver tfp410_driver = {
 382         .probe = tfp410_probe,
 383         .remove = tfp410_remove,
 384         .driver = {
 385                 .owner = THIS_MODULE,
 386                 .name = "tfp410",
 387                 .of_match_table = tfp410_of_match,
 388         },
 389 };
 390
 391 int __init tilcdc_tfp410_init(void)
 392 {
 393         return platform_driver_register(&tfp410_driver);
 394 }
 395
 396 void __exit tilcdc_tfp410_fini(void)
 397 {
 398         platform_driver_unregister(&tfp410_driver);
 399 }