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
  27 struct tfp410_module {
  28         struct tilcdc_module base;
  29         struct i2c_adapter *i2c;
  30         int gpio;
  31 };
  32 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
  33
  34
  35 static const struct tilcdc_panel_info dvi_info = {
  36                 .ac_bias                = 255,
  37                 .ac_bias_intrpt         = 0,
  38                 .dma_burst_sz           = 16,
  39                 .bpp                    = 16,
  40                 .fdd                    = 0x80,
  41                 .tft_alt_mode           = 0,
  42                 .sync_edge              = 0,
  43                 .sync_ctrl              = 1,
  44                 .raster_order           = 0,
  45 };
  46
  47 /*
  48  * Encoder:
  49  */
  50
  51 struct tfp410_encoder {
  52         struct drm_encoder base;
  53         struct tfp410_module *mod;
  54         int dpms;
  55 };
  56 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
  57
  58 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  59 {
  60         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  61
  62         if (tfp410_encoder->dpms == mode)
  63                 return;
  64
  65         if (mode == DRM_MODE_DPMS_ON) {
  66                 DBG("Power on");
  67                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  68         } else {
  69                 DBG("Power off");
  70                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  71         }
  72
  73         tfp410_encoder->dpms = mode;
  74 }
  75
  76 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  77 {
  78         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  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_atomic_helper_connector_dpms,
 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         drm_connector_register(connector);
 252
 253         return connector;
 254
 255 fail:
 256         tfp410_connector_destroy(connector);
 257         return NULL;
 258 }
 259
 260 /*
 261  * Module:
 262  */
 263
 264 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 265 {
 266         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 267         struct tilcdc_drm_private *priv = dev->dev_private;
 268         struct drm_encoder *encoder;
 269         struct drm_connector *connector;
 270
 271         encoder = tfp410_encoder_create(dev, tfp410_mod);
 272         if (!encoder)
 273                 return -ENOMEM;
 274
 275         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 276         if (!connector)
 277                 return -ENOMEM;
 278
 279         priv->encoders[priv->num_encoders++] = encoder;
 280         priv->connectors[priv->num_connectors++] = connector;
 281
 282         tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
 283         return 0;
 284 }
 285
 286 static const struct tilcdc_module_ops tfp410_module_ops = {
 287                 .modeset_init = tfp410_modeset_init,
 288 };
 289
 290 /*
 291  * Device:
 292  */
 293
 294 static struct of_device_id tfp410_of_match[];
 295
 296 static int tfp410_probe(struct platform_device *pdev)
 297 {
 298         struct device_node *node = pdev->dev.of_node;
 299         struct device_node *i2c_node;
 300         struct tfp410_module *tfp410_mod;
 301         struct tilcdc_module *mod;
 302         struct pinctrl *pinctrl;
 303         uint32_t i2c_phandle;
 304         int ret = -EINVAL;
 305
 306         /* bail out early if no DT data: */
 307         if (!node) {
 308                 dev_err(&pdev->dev, "device-tree data is missing\n");
 309                 return -ENXIO;
 310         }
 311
 312         tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
 313         if (!tfp410_mod)
 314                 return -ENOMEM;
 315
 316         mod = &tfp410_mod->base;
 317         pdev->dev.platform_data = mod;
 318
 319         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 320
 321         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 322         if (IS_ERR(pinctrl))
 323                 dev_warn(&pdev->dev, "pins are not configured\n");
 324
 325         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 326                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 327                 goto fail;
 328         }
 329
 330         i2c_node = of_find_node_by_phandle(i2c_phandle);
 331         if (!i2c_node) {
 332                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 333                 goto fail;
 334         }
 335
 336         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 337         if (!tfp410_mod->i2c) {
 338                 dev_err(&pdev->dev, "could not get i2c\n");
 339                 of_node_put(i2c_node);
 340                 goto fail;
 341         }
 342
 343         of_node_put(i2c_node);
 344
 345         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 346                         0, NULL);
 347         if (tfp410_mod->gpio < 0) {
 348                 dev_warn(&pdev->dev, "No power down GPIO\n");
 349         } else {
 350                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 351                 if (ret) {
 352                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 353                         goto fail_adapter;
 354                 }
 355         }
 356
 357         return 0;
 358
 359 fail_adapter:
 360         i2c_put_adapter(tfp410_mod->i2c);
 361
 362 fail:
 363         tilcdc_module_cleanup(mod);
 364         return ret;
 365 }
 366
 367 static int tfp410_remove(struct platform_device *pdev)
 368 {
 369         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 370         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 371
 372         i2c_put_adapter(tfp410_mod->i2c);
 373         gpio_free(tfp410_mod->gpio);
 374
 375         tilcdc_module_cleanup(mod);
 376
 377         return 0;
 378 }
 379
 380 static struct of_device_id tfp410_of_match[] = {
 381                 { .compatible = "ti,tilcdc,tfp410", },
 382                 { },
 383 };
 384
 385 struct platform_driver tfp410_driver = {
 386         .probe = tfp410_probe,
 387         .remove = tfp410_remove,
 388         .driver = {
 389                 .owner = THIS_MODULE,
 390                 .name = "tfp410",
 391                 .of_match_table = tfp410_of_match,
 392         },
 393 };
 394
 395 int __init tilcdc_tfp410_init(void)
 396 {
 397         return platform_driver_register(&tfp410_driver);
 398 }
 399
 400 void __exit tilcdc_tfp410_fini(void)
 401 {
 402         platform_driver_unregister(&tfp410_driver);
 403 }