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 #include <drm/drm_probe_helper.h>
  25
  26 #include "tilcdc_drv.h"
  27 #include "tilcdc_tfp410.h"
  28
  29 struct tfp410_module {
  30         struct tilcdc_module base;
  31         struct i2c_adapter *i2c;
  32         int gpio;
  33 };
  34 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
  35
  36
  37 static const struct tilcdc_panel_info dvi_info = {
  38                 .ac_bias                = 255,
  39                 .ac_bias_intrpt         = 0,
  40                 .dma_burst_sz           = 16,
  41                 .bpp                    = 16,
  42                 .fdd                    = 0x80,
  43                 .tft_alt_mode           = 0,
  44                 .sync_edge              = 0,
  45                 .sync_ctrl              = 1,
  46                 .raster_order           = 0,
  47 };
  48
  49 /*
  50  * Encoder:
  51  */
  52
  53 struct tfp410_encoder {
  54         struct drm_encoder base;
  55         struct tfp410_module *mod;
  56         int dpms;
  57 };
  58 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
  59
  60 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  61 {
  62         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  63
  64         if (tfp410_encoder->dpms == mode)
  65                 return;
  66
  67         if (mode == DRM_MODE_DPMS_ON) {
  68                 DBG("Power on");
  69                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  70         } else {
  71                 DBG("Power off");
  72                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  73         }
  74
  75         tfp410_encoder->dpms = mode;
  76 }
  77
  78 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  79 {
  80         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  81 }
  82
  83 static void tfp410_encoder_commit(struct drm_encoder *encoder)
  84 {
  85         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  86 }
  87
  88 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
  89                 struct drm_display_mode *mode,
  90                 struct drm_display_mode *adjusted_mode)
  91 {
  92         /* nothing needed */
  93 }
  94
  95 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
  96                 .destroy        = drm_encoder_cleanup,
  97 };
  98
  99 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
 100                 .dpms           = tfp410_encoder_dpms,
 101                 .prepare        = tfp410_encoder_prepare,
 102                 .commit         = tfp410_encoder_commit,
 103                 .mode_set       = tfp410_encoder_mode_set,
 104 };
 105
 106 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
 107                 struct tfp410_module *mod)
 108 {
 109         struct tfp410_encoder *tfp410_encoder;
 110         struct drm_encoder *encoder;
 111         int ret;
 112
 113         tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
 114                                       GFP_KERNEL);
 115         if (!tfp410_encoder)
 116                 return NULL;
 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_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         .detect             = tfp410_connector_detect,
 205         .fill_modes         = drm_helper_probe_single_connector_modes,
 206         .reset              = drm_atomic_helper_connector_reset,
 207         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 208         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 209 };
 210
 211 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 212         .get_modes          = tfp410_connector_get_modes,
 213         .mode_valid         = tfp410_connector_mode_valid,
 214         .best_encoder       = tfp410_connector_best_encoder,
 215 };
 216
 217 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 218                 struct tfp410_module *mod, struct drm_encoder *encoder)
 219 {
 220         struct tfp410_connector *tfp410_connector;
 221         struct drm_connector *connector;
 222         int ret;
 223
 224         tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 225                                         GFP_KERNEL);
 226         if (!tfp410_connector)
 227                 return NULL;
 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_connector_attach_encoder(connector, encoder);
 245         if (ret)
 246                 goto fail;
 247
 248         return connector;
 249
 250 fail:
 251         tfp410_connector_destroy(connector);
 252         return NULL;
 253 }
 254
 255 /*
 256  * Module:
 257  */
 258
 259 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 260 {
 261         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 262         struct tilcdc_drm_private *priv = dev->dev_private;
 263         struct drm_encoder *encoder;
 264         struct drm_connector *connector;
 265
 266         encoder = tfp410_encoder_create(dev, tfp410_mod);
 267         if (!encoder)
 268                 return -ENOMEM;
 269
 270         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 271         if (!connector)
 272                 return -ENOMEM;
 273
 274         priv->encoders[priv->num_encoders++] = encoder;
 275         priv->connectors[priv->num_connectors++] = connector;
 276
 277         tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
 278         return 0;
 279 }
 280
 281 static const struct tilcdc_module_ops tfp410_module_ops = {
 282                 .modeset_init = tfp410_modeset_init,
 283 };
 284
 285 /*
 286  * Device:
 287  */
 288
 289 static int tfp410_probe(struct platform_device *pdev)
 290 {
 291         struct device_node *node = pdev->dev.of_node;
 292         struct device_node *i2c_node;
 293         struct tfp410_module *tfp410_mod;
 294         struct tilcdc_module *mod;
 295         struct pinctrl *pinctrl;
 296         uint32_t i2c_phandle;
 297         int ret = -EINVAL;
 298
 299         /* bail out early if no DT data: */
 300         if (!node) {
 301                 dev_err(&pdev->dev, "device-tree data is missing\n");
 302                 return -ENXIO;
 303         }
 304
 305         tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
 306         if (!tfp410_mod)
 307                 return -ENOMEM;
 308
 309         mod = &tfp410_mod->base;
 310         pdev->dev.platform_data = mod;
 311
 312         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 313
 314         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 315         if (IS_ERR(pinctrl))
 316                 dev_warn(&pdev->dev, "pins are not configured\n");
 317
 318         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 319                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 320                 goto fail;
 321         }
 322
 323         i2c_node = of_find_node_by_phandle(i2c_phandle);
 324         if (!i2c_node) {
 325                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 326                 goto fail;
 327         }
 328
 329         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 330         if (!tfp410_mod->i2c) {
 331                 dev_err(&pdev->dev, "could not get i2c\n");
 332                 of_node_put(i2c_node);
 333                 goto fail;
 334         }
 335
 336         of_node_put(i2c_node);
 337
 338         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 339                         0, NULL);
 340         if (tfp410_mod->gpio < 0) {
 341                 dev_warn(&pdev->dev, "No power down GPIO\n");
 342         } else {
 343                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 344                 if (ret) {
 345                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 346                         goto fail_adapter;
 347                 }
 348         }
 349
 350         return 0;
 351
 352 fail_adapter:
 353         i2c_put_adapter(tfp410_mod->i2c);
 354
 355 fail:
 356         tilcdc_module_cleanup(mod);
 357         return ret;
 358 }
 359
 360 static int tfp410_remove(struct platform_device *pdev)
 361 {
 362         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 363         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 364
 365         i2c_put_adapter(tfp410_mod->i2c);
 366         gpio_free(tfp410_mod->gpio);
 367
 368         tilcdc_module_cleanup(mod);
 369
 370         return 0;
 371 }
 372
 373 static const struct of_device_id tfp410_of_match[] = {
 374                 { .compatible = "ti,tilcdc,tfp410", },
 375                 { },
 376 };
 377
 378 struct platform_driver tfp410_driver = {
 379         .probe = tfp410_probe,
 380         .remove = tfp410_remove,
 381         .driver = {
 382                 .owner = THIS_MODULE,
 383                 .name = "tfp410",
 384                 .of_match_table = tfp410_of_match,
 385         },
 386 };
 387
 388 int __init tilcdc_tfp410_init(void)
 389 {
 390         return platform_driver_register(&tfp410_driver);
 391 }
 392
 393 void __exit tilcdc_tfp410_fini(void)
 394 {
 395         platform_driver_unregister(&tfp410_driver);
 396 }