kernel/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
  58 static void tfp410_encoder_destroy(struct drm_encoder *encoder)
  59 {
  60         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  61         drm_encoder_cleanup(encoder);
  62         kfree(tfp410_encoder);
  63 }
  64
  65 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  66 {
  67         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  68
  69         if (tfp410_encoder->dpms == mode)
  70                 return;
  71
  72         if (mode == DRM_MODE_DPMS_ON) {
  73                 DBG("Power on");
  74                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  75         } else {
  76                 DBG("Power off");
  77                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  78         }
  79
  80         tfp410_encoder->dpms = mode;
  81 }
  82
  83 static bool tfp410_encoder_mode_fixup(struct drm_encoder *encoder,
  84                 const struct drm_display_mode *mode,
  85                 struct drm_display_mode *adjusted_mode)
  86 {
  87         /* nothing needed */
  88         return true;
  89 }
  90
  91 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  92 {
  93         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  94         tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
  95 }
  96
  97 static void tfp410_encoder_commit(struct drm_encoder *encoder)
  98 {
  99         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 100 }
 101
 102 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
 103                 struct drm_display_mode *mode,
 104                 struct drm_display_mode *adjusted_mode)
 105 {
 106         /* nothing needed */
 107 }
 108
 109 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
 110                 .destroy        = tfp410_encoder_destroy,
 111 };
 112
 113 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
 114                 .dpms           = tfp410_encoder_dpms,
 115                 .mode_fixup     = tfp410_encoder_mode_fixup,
 116                 .prepare        = tfp410_encoder_prepare,
 117                 .commit         = tfp410_encoder_commit,
 118                 .mode_set       = tfp410_encoder_mode_set,
 119 };
 120
 121 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
 122                 struct tfp410_module *mod)
 123 {
 124         struct tfp410_encoder *tfp410_encoder;
 125         struct drm_encoder *encoder;
 126         int ret;
 127
 128         tfp410_encoder = kzalloc(sizeof(*tfp410_encoder), GFP_KERNEL);
 129         if (!tfp410_encoder) {
 130                 dev_err(dev->dev, "allocation failed\n");
 131                 return NULL;
 132         }
 133
 134         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 135         tfp410_encoder->mod = mod;
 136
 137         encoder = &tfp410_encoder->base;
 138         encoder->possible_crtcs = 1;
 139
 140         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
 141                         DRM_MODE_ENCODER_TMDS);
 142         if (ret < 0)
 143                 goto fail;
 144
 145         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
 146
 147         return encoder;
 148
 149 fail:
 150         tfp410_encoder_destroy(encoder);
 151         return NULL;
 152 }
 153
 154 /*
 155  * Connector:
 156  */
 157
 158 struct tfp410_connector {
 159         struct drm_connector base;
 160
 161         struct drm_encoder *encoder;  /* our connected encoder */
 162         struct tfp410_module *mod;
 163 };
 164 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
 165
 166
 167 static void tfp410_connector_destroy(struct drm_connector *connector)
 168 {
 169         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 170         drm_connector_unregister(connector);
 171         drm_connector_cleanup(connector);
 172         kfree(tfp410_connector);
 173 }
 174
 175 static enum drm_connector_status tfp410_connector_detect(
 176                 struct drm_connector *connector,
 177                 bool force)
 178 {
 179         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 180
 181         if (drm_probe_ddc(tfp410_connector->mod->i2c))
 182                 return connector_status_connected;
 183
 184         return connector_status_unknown;
 185 }
 186
 187 static int tfp410_connector_get_modes(struct drm_connector *connector)
 188 {
 189         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 190         struct edid *edid;
 191         int ret = 0;
 192
 193         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
 194
 195         drm_mode_connector_update_edid_property(connector, edid);
 196
 197         if (edid) {
 198                 ret = drm_add_edid_modes(connector, edid);
 199                 kfree(edid);
 200         }
 201
 202         return ret;
 203 }
 204
 205 static int tfp410_connector_mode_valid(struct drm_connector *connector,
 206                   struct drm_display_mode *mode)
 207 {
 208         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 209         /* our only constraints are what the crtc can generate: */
 210         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 211 }
 212
 213 static struct drm_encoder *tfp410_connector_best_encoder(
 214                 struct drm_connector *connector)
 215 {
 216         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 217         return tfp410_connector->encoder;
 218 }
 219
 220 static const struct drm_connector_funcs tfp410_connector_funcs = {
 221         .destroy            = tfp410_connector_destroy,
 222         .dpms               = drm_helper_connector_dpms,
 223         .detect             = tfp410_connector_detect,
 224         .fill_modes         = drm_helper_probe_single_connector_modes,
 225 };
 226
 227 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 228         .get_modes          = tfp410_connector_get_modes,
 229         .mode_valid         = tfp410_connector_mode_valid,
 230         .best_encoder       = tfp410_connector_best_encoder,
 231 };
 232
 233 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 234                 struct tfp410_module *mod, struct drm_encoder *encoder)
 235 {
 236         struct tfp410_connector *tfp410_connector;
 237         struct drm_connector *connector;
 238         int ret;
 239
 240         tfp410_connector = kzalloc(sizeof(*tfp410_connector), GFP_KERNEL);
 241         if (!tfp410_connector) {
 242                 dev_err(dev->dev, "allocation failed\n");
 243                 return NULL;
 244         }
 245
 246         tfp410_connector->encoder = encoder;
 247         tfp410_connector->mod = mod;
 248
 249         connector = &tfp410_connector->base;
 250
 251         drm_connector_init(dev, connector, &tfp410_connector_funcs,
 252                         DRM_MODE_CONNECTOR_DVID);
 253         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 254
 255         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 256                         DRM_CONNECTOR_POLL_DISCONNECT;
 257
 258         connector->interlace_allowed = 0;
 259         connector->doublescan_allowed = 0;
 260
 261         ret = drm_mode_connector_attach_encoder(connector, encoder);
 262         if (ret)
 263                 goto fail;
 264
 265         drm_connector_register(connector);
 266
 267         return connector;
 268
 269 fail:
 270         tfp410_connector_destroy(connector);
 271         return NULL;
 272 }
 273
 274 /*
 275  * Module:
 276  */
 277
 278 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 279 {
 280         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 281         struct tilcdc_drm_private *priv = dev->dev_private;
 282         struct drm_encoder *encoder;
 283         struct drm_connector *connector;
 284
 285         encoder = tfp410_encoder_create(dev, tfp410_mod);
 286         if (!encoder)
 287                 return -ENOMEM;
 288
 289         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 290         if (!connector)
 291                 return -ENOMEM;
 292
 293         priv->encoders[priv->num_encoders++] = encoder;
 294         priv->connectors[priv->num_connectors++] = connector;
 295
 296         return 0;
 297 }
 298
 299 static const struct tilcdc_module_ops tfp410_module_ops = {
 300                 .modeset_init = tfp410_modeset_init,
 301 };
 302
 303 /*
 304  * Device:
 305  */
 306
 307 static struct of_device_id tfp410_of_match[];
 308
 309 static int tfp410_probe(struct platform_device *pdev)
 310 {
 311         struct device_node *node = pdev->dev.of_node;
 312         struct device_node *i2c_node;
 313         struct tfp410_module *tfp410_mod;
 314         struct tilcdc_module *mod;
 315         struct pinctrl *pinctrl;
 316         uint32_t i2c_phandle;
 317         int ret = -EINVAL;
 318
 319         /* bail out early if no DT data: */
 320         if (!node) {
 321                 dev_err(&pdev->dev, "device-tree data is missing\n");
 322                 return -ENXIO;
 323         }
 324
 325         tfp410_mod = kzalloc(sizeof(*tfp410_mod), GFP_KERNEL);
 326         if (!tfp410_mod)
 327                 return -ENOMEM;
 328
 329         mod = &tfp410_mod->base;
 330         pdev->dev.platform_data = mod;
 331
 332         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 333
 334         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 335         if (IS_ERR(pinctrl))
 336                 dev_warn(&pdev->dev, "pins are not configured\n");
 337
 338         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 339                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 340                 goto fail;
 341         }
 342
 343         mod->preferred_bpp = dvi_info.bpp;
 344
 345         i2c_node = of_find_node_by_phandle(i2c_phandle);
 346         if (!i2c_node) {
 347                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 348                 goto fail;
 349         }
 350
 351         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 352         if (!tfp410_mod->i2c) {
 353                 dev_err(&pdev->dev, "could not get i2c\n");
 354                 of_node_put(i2c_node);
 355                 goto fail;
 356         }
 357
 358         of_node_put(i2c_node);
 359
 360         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 361                         0, NULL);
 362         if (IS_ERR_VALUE(tfp410_mod->gpio)) {
 363                 dev_warn(&pdev->dev, "No power down GPIO\n");
 364         } else {
 365                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 366                 if (ret) {
 367                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 368                         goto fail_adapter;
 369                 }
 370         }
 371
 372         return 0;
 373
 374 fail_adapter:
 375         i2c_put_adapter(tfp410_mod->i2c);
 376
 377 fail:
 378         kfree(tfp410_mod);
 379         tilcdc_module_cleanup(mod);
 380         return ret;
 381 }
 382
 383 static int tfp410_remove(struct platform_device *pdev)
 384 {
 385         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 386         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 387
 388         i2c_put_adapter(tfp410_mod->i2c);
 389         gpio_free(tfp410_mod->gpio);
 390
 391         tilcdc_module_cleanup(mod);
 392         kfree(tfp410_mod);
 393
 394         return 0;
 395 }
 396
 397 static struct of_device_id tfp410_of_match[] = {
 398                 { .compatible = "ti,tilcdc,tfp410", },
 399                 { },
 400 };
 401
 402 struct platform_driver tfp410_driver = {
 403         .probe = tfp410_probe,
 404         .remove = tfp410_remove,
 405         .driver = {
 406                 .owner = THIS_MODULE,
 407                 .name = "tfp410",
 408                 .of_match_table = tfp410_of_match,
 409         },
 410 };
 411
 412 int __init tilcdc_tfp410_init(void)
 413 {
 414         return platform_driver_register(&tfp410_driver);
 415 }
 416
 417 void __exit tilcdc_tfp410_fini(void)
 418 {
 419         platform_driver_unregister(&tfp410_driver);
 420 }