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/of_i2c.h>
  20 #include <linux/gpio.h>
  21 #include <linux/of_gpio.h>
  22 #include <linux/pinctrl/pinmux.h>
  23 #include <linux/pinctrl/consumer.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
  59 static void tfp410_encoder_destroy(struct drm_encoder *encoder)
  60 {
  61         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  62         drm_encoder_cleanup(encoder);
  63         kfree(tfp410_encoder);
  64 }
  65
  66 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  67 {
  68         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  69
  70         if (tfp410_encoder->dpms == mode)
  71                 return;
  72
  73         if (mode == DRM_MODE_DPMS_ON) {
  74                 DBG("Power on");
  75                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  76         } else {
  77                 DBG("Power off");
  78                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  79         }
  80
  81         tfp410_encoder->dpms = mode;
  82 }
  83
  84 static bool tfp410_encoder_mode_fixup(struct drm_encoder *encoder,
  85                 const struct drm_display_mode *mode,
  86                 struct drm_display_mode *adjusted_mode)
  87 {
  88         /* nothing needed */
  89         return true;
  90 }
  91
  92 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  93 {
  94         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  95         tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
  96 }
  97
  98 static void tfp410_encoder_commit(struct drm_encoder *encoder)
  99 {
 100         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 101 }
 102
 103 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
 104                 struct drm_display_mode *mode,
 105                 struct drm_display_mode *adjusted_mode)
 106 {
 107         /* nothing needed */
 108 }
 109
 110 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
 111                 .destroy        = tfp410_encoder_destroy,
 112 };
 113
 114 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
 115                 .dpms           = tfp410_encoder_dpms,
 116                 .mode_fixup     = tfp410_encoder_mode_fixup,
 117                 .prepare        = tfp410_encoder_prepare,
 118                 .commit         = tfp410_encoder_commit,
 119                 .mode_set       = tfp410_encoder_mode_set,
 120 };
 121
 122 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
 123                 struct tfp410_module *mod)
 124 {
 125         struct tfp410_encoder *tfp410_encoder;
 126         struct drm_encoder *encoder;
 127         int ret;
 128
 129         tfp410_encoder = kzalloc(sizeof(*tfp410_encoder), GFP_KERNEL);
 130         if (!tfp410_encoder) {
 131                 dev_err(dev->dev, "allocation failed\n");
 132                 return NULL;
 133         }
 134
 135         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 136         tfp410_encoder->mod = mod;
 137
 138         encoder = &tfp410_encoder->base;
 139         encoder->possible_crtcs = 1;
 140
 141         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
 142                         DRM_MODE_ENCODER_TMDS);
 143         if (ret < 0)
 144                 goto fail;
 145
 146         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
 147
 148         return encoder;
 149
 150 fail:
 151         tfp410_encoder_destroy(encoder);
 152         return NULL;
 153 }
 154
 155 /*
 156  * Connector:
 157  */
 158
 159 struct tfp410_connector {
 160         struct drm_connector base;
 161
 162         struct drm_encoder *encoder;  /* our connected encoder */
 163         struct tfp410_module *mod;
 164 };
 165 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
 166
 167
 168 static void tfp410_connector_destroy(struct drm_connector *connector)
 169 {
 170         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 171         drm_sysfs_connector_remove(connector);
 172         drm_connector_cleanup(connector);
 173         kfree(tfp410_connector);
 174 }
 175
 176 static enum drm_connector_status tfp410_connector_detect(
 177                 struct drm_connector *connector,
 178                 bool force)
 179 {
 180         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 181
 182         if (drm_probe_ddc(tfp410_connector->mod->i2c))
 183                 return connector_status_connected;
 184
 185         return connector_status_unknown;
 186 }
 187
 188 static int tfp410_connector_get_modes(struct drm_connector *connector)
 189 {
 190         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 191         struct edid *edid;
 192         int ret = 0;
 193
 194         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
 195
 196         drm_mode_connector_update_edid_property(connector, edid);
 197
 198         if (edid) {
 199                 ret = drm_add_edid_modes(connector, edid);
 200                 kfree(edid);
 201         }
 202
 203         return ret;
 204 }
 205
 206 static int tfp410_connector_mode_valid(struct drm_connector *connector,
 207                   struct drm_display_mode *mode)
 208 {
 209         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 210         /* our only constraints are what the crtc can generate: */
 211         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 212 }
 213
 214 static struct drm_encoder *tfp410_connector_best_encoder(
 215                 struct drm_connector *connector)
 216 {
 217         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 218         return tfp410_connector->encoder;
 219 }
 220
 221 static const struct drm_connector_funcs tfp410_connector_funcs = {
 222         .destroy            = tfp410_connector_destroy,
 223         .dpms               = drm_helper_connector_dpms,
 224         .detect             = tfp410_connector_detect,
 225         .fill_modes         = drm_helper_probe_single_connector_modes,
 226 };
 227
 228 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 229         .get_modes          = tfp410_connector_get_modes,
 230         .mode_valid         = tfp410_connector_mode_valid,
 231         .best_encoder       = tfp410_connector_best_encoder,
 232 };
 233
 234 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 235                 struct tfp410_module *mod, struct drm_encoder *encoder)
 236 {
 237         struct tfp410_connector *tfp410_connector;
 238         struct drm_connector *connector;
 239         int ret;
 240
 241         tfp410_connector = kzalloc(sizeof(*tfp410_connector), GFP_KERNEL);
 242         if (!tfp410_connector) {
 243                 dev_err(dev->dev, "allocation failed\n");
 244                 return NULL;
 245         }
 246
 247         tfp410_connector->encoder = encoder;
 248         tfp410_connector->mod = mod;
 249
 250         connector = &tfp410_connector->base;
 251
 252         drm_connector_init(dev, connector, &tfp410_connector_funcs,
 253                         DRM_MODE_CONNECTOR_DVID);
 254         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 255
 256         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 257                         DRM_CONNECTOR_POLL_DISCONNECT;
 258
 259         connector->interlace_allowed = 0;
 260         connector->doublescan_allowed = 0;
 261
 262         ret = drm_mode_connector_attach_encoder(connector, encoder);
 263         if (ret)
 264                 goto fail;
 265
 266         drm_sysfs_connector_add(connector);
 267
 268         return connector;
 269
 270 fail:
 271         tfp410_connector_destroy(connector);
 272         return NULL;
 273 }
 274
 275 /*
 276  * Module:
 277  */
 278
 279 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 280 {
 281         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 282         struct tilcdc_drm_private *priv = dev->dev_private;
 283         struct drm_encoder *encoder;
 284         struct drm_connector *connector;
 285
 286         encoder = tfp410_encoder_create(dev, tfp410_mod);
 287         if (!encoder)
 288                 return -ENOMEM;
 289
 290         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 291         if (!connector)
 292                 return -ENOMEM;
 293
 294         priv->encoders[priv->num_encoders++] = encoder;
 295         priv->connectors[priv->num_connectors++] = connector;
 296
 297         return 0;
 298 }
 299
 300 static void tfp410_destroy(struct tilcdc_module *mod)
 301 {
 302         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 303
 304         if (tfp410_mod->i2c)
 305                 i2c_put_adapter(tfp410_mod->i2c);
 306
 307         if (!IS_ERR_VALUE(tfp410_mod->gpio))
 308                 gpio_free(tfp410_mod->gpio);
 309
 310         tilcdc_module_cleanup(mod);
 311         kfree(tfp410_mod);
 312 }
 313
 314 static const struct tilcdc_module_ops tfp410_module_ops = {
 315                 .modeset_init = tfp410_modeset_init,
 316                 .destroy = tfp410_destroy,
 317 };
 318
 319 /*
 320  * Device:
 321  */
 322
 323 static struct of_device_id tfp410_of_match[];
 324
 325 static int tfp410_probe(struct platform_device *pdev)
 326 {
 327         struct device_node *node = pdev->dev.of_node;
 328         struct device_node *i2c_node;
 329         struct tfp410_module *tfp410_mod;
 330         struct tilcdc_module *mod;
 331         struct pinctrl *pinctrl;
 332         uint32_t i2c_phandle;
 333         int ret = -EINVAL;
 334
 335         /* bail out early if no DT data: */
 336         if (!node) {
 337                 dev_err(&pdev->dev, "device-tree data is missing\n");
 338                 return -ENXIO;
 339         }
 340
 341         tfp410_mod = kzalloc(sizeof(*tfp410_mod), GFP_KERNEL);
 342         if (!tfp410_mod)
 343                 return -ENOMEM;
 344
 345         mod = &tfp410_mod->base;
 346
 347         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 348
 349         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 350         if (IS_ERR(pinctrl))
 351                 dev_warn(&pdev->dev, "pins are not configured\n");
 352
 353         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 354                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 355                 goto fail;
 356         }
 357
 358         i2c_node = of_find_node_by_phandle(i2c_phandle);
 359         if (!i2c_node) {
 360                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 361                 goto fail;
 362         }
 363
 364         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 365         if (!tfp410_mod->i2c) {
 366                 dev_err(&pdev->dev, "could not get i2c\n");
 367                 goto fail;
 368         }
 369
 370         of_node_put(i2c_node);
 371
 372         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 373                         0, NULL);
 374         if (IS_ERR_VALUE(tfp410_mod->gpio)) {
 375                 dev_warn(&pdev->dev, "No power down GPIO\n");
 376         } else {
 377                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 378                 if (ret) {
 379                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 380                         goto fail;
 381                 }
 382         }
 383
 384         return 0;
 385
 386 fail:
 387         tfp410_destroy(mod);
 388         return ret;
 389 }
 390
 391 static int tfp410_remove(struct platform_device *pdev)
 392 {
 393         return 0;
 394 }
 395
 396 static struct of_device_id tfp410_of_match[] = {
 397                 { .compatible = "ti,tilcdc,tfp410", },
 398                 { },
 399 };
 400
 401 struct platform_driver tfp410_driver = {
 402         .probe = tfp410_probe,
 403         .remove = tfp410_remove,
 404         .driver = {
 405                 .owner = THIS_MODULE,
 406                 .name = "tfp410",
 407                 .of_match_table = tfp410_of_match,
 408         },
 409 };
 410
 411 int __init tilcdc_tfp410_init(void)
 412 {
 413         return platform_driver_register(&tfp410_driver);
 414 }
 415
 416 void __exit tilcdc_tfp410_fini(void)
 417 {
 418         platform_driver_unregister(&tfp410_driver);
 419 }