drivers/gpu/drm/tilcdc/tilcdc_tfp410.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Texas Instruments
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <linux/gpio.h>
   8 #include <linux/mod_devicetable.h>
   9 #include <linux/of_gpio.h>
  10 #include <linux/platform_device.h>
  11
  12 #include <drm/drm_atomic_helper.h>
  13 #include <drm/drm_encoder.h>
  14 #include <drm/drm_modeset_helper_vtables.h>
  15 #include <drm/drm_probe_helper.h>
  16
  17 #include "tilcdc_drv.h"
  18 #include "tilcdc_tfp410.h"
  19
  20 struct tfp410_module {
  21         struct tilcdc_module base;
  22         struct i2c_adapter *i2c;
  23         int gpio;
  24 };
  25 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
  26
  27
  28 static const struct tilcdc_panel_info dvi_info = {
  29                 .ac_bias                = 255,
  30                 .ac_bias_intrpt         = 0,
  31                 .dma_burst_sz           = 16,
  32                 .bpp                    = 16,
  33                 .fdd                    = 0x80,
  34                 .tft_alt_mode           = 0,
  35                 .sync_edge              = 0,
  36                 .sync_ctrl              = 1,
  37                 .raster_order           = 0,
  38 };
  39
  40 /*
  41  * Encoder:
  42  */
  43
  44 struct tfp410_encoder {
  45         struct drm_encoder base;
  46         struct tfp410_module *mod;
  47         int dpms;
  48 };
  49 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
  50
  51 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  52 {
  53         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  54
  55         if (tfp410_encoder->dpms == mode)
  56                 return;
  57
  58         if (mode == DRM_MODE_DPMS_ON) {
  59                 DBG("Power on");
  60                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  61         } else {
  62                 DBG("Power off");
  63                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  64         }
  65
  66         tfp410_encoder->dpms = mode;
  67 }
  68
  69 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  70 {
  71         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  72 }
  73
  74 static void tfp410_encoder_commit(struct drm_encoder *encoder)
  75 {
  76         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  77 }
  78
  79 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
  80                 struct drm_display_mode *mode,
  81                 struct drm_display_mode *adjusted_mode)
  82 {
  83         /* nothing needed */
  84 }
  85
  86 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
  87                 .destroy        = drm_encoder_cleanup,
  88 };
  89
  90 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
  91                 .dpms           = tfp410_encoder_dpms,
  92                 .prepare        = tfp410_encoder_prepare,
  93                 .commit         = tfp410_encoder_commit,
  94                 .mode_set       = tfp410_encoder_mode_set,
  95 };
  96
  97 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
  98                 struct tfp410_module *mod)
  99 {
 100         struct tfp410_encoder *tfp410_encoder;
 101         struct drm_encoder *encoder;
 102         int ret;
 103
 104         tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
 105                                       GFP_KERNEL);
 106         if (!tfp410_encoder)
 107                 return NULL;
 108
 109         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 110         tfp410_encoder->mod = mod;
 111
 112         encoder = &tfp410_encoder->base;
 113         encoder->possible_crtcs = 1;
 114
 115         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
 116                         DRM_MODE_ENCODER_TMDS, NULL);
 117         if (ret < 0)
 118                 goto fail;
 119
 120         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
 121
 122         return encoder;
 123
 124 fail:
 125         drm_encoder_cleanup(encoder);
 126         return NULL;
 127 }
 128
 129 /*
 130  * Connector:
 131  */
 132
 133 struct tfp410_connector {
 134         struct drm_connector base;
 135
 136         struct drm_encoder *encoder;  /* our connected encoder */
 137         struct tfp410_module *mod;
 138 };
 139 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
 140
 141
 142 static void tfp410_connector_destroy(struct drm_connector *connector)
 143 {
 144         drm_connector_unregister(connector);
 145         drm_connector_cleanup(connector);
 146 }
 147
 148 static enum drm_connector_status tfp410_connector_detect(
 149                 struct drm_connector *connector,
 150                 bool force)
 151 {
 152         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 153
 154         if (drm_probe_ddc(tfp410_connector->mod->i2c))
 155                 return connector_status_connected;
 156
 157         return connector_status_unknown;
 158 }
 159
 160 static int tfp410_connector_get_modes(struct drm_connector *connector)
 161 {
 162         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 163         struct edid *edid;
 164         int ret = 0;
 165
 166         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
 167
 168         drm_connector_update_edid_property(connector, edid);
 169
 170         if (edid) {
 171                 ret = drm_add_edid_modes(connector, edid);
 172                 kfree(edid);
 173         }
 174
 175         return ret;
 176 }
 177
 178 static struct drm_encoder *tfp410_connector_best_encoder(
 179                 struct drm_connector *connector)
 180 {
 181         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 182         return tfp410_connector->encoder;
 183 }
 184
 185 static const struct drm_connector_funcs tfp410_connector_funcs = {
 186         .destroy            = tfp410_connector_destroy,
 187         .detect             = tfp410_connector_detect,
 188         .fill_modes         = drm_helper_probe_single_connector_modes,
 189         .reset              = drm_atomic_helper_connector_reset,
 190         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 191         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 192 };
 193
 194 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 195         .get_modes          = tfp410_connector_get_modes,
 196         .best_encoder       = tfp410_connector_best_encoder,
 197 };
 198
 199 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 200                 struct tfp410_module *mod, struct drm_encoder *encoder)
 201 {
 202         struct tfp410_connector *tfp410_connector;
 203         struct drm_connector *connector;
 204         int ret;
 205
 206         tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 207                                         GFP_KERNEL);
 208         if (!tfp410_connector)
 209                 return NULL;
 210
 211         tfp410_connector->encoder = encoder;
 212         tfp410_connector->mod = mod;
 213
 214         connector = &tfp410_connector->base;
 215
 216         drm_connector_init(dev, connector, &tfp410_connector_funcs,
 217                         DRM_MODE_CONNECTOR_DVID);
 218         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 219
 220         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 221                         DRM_CONNECTOR_POLL_DISCONNECT;
 222
 223         connector->interlace_allowed = 0;
 224         connector->doublescan_allowed = 0;
 225
 226         ret = drm_connector_attach_encoder(connector, encoder);
 227         if (ret)
 228                 goto fail;
 229
 230         return connector;
 231
 232 fail:
 233         tfp410_connector_destroy(connector);
 234         return NULL;
 235 }
 236
 237 /*
 238  * Module:
 239  */
 240
 241 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 242 {
 243         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 244         struct tilcdc_drm_private *priv = dev->dev_private;
 245         struct drm_encoder *encoder;
 246         struct drm_connector *connector;
 247
 248         encoder = tfp410_encoder_create(dev, tfp410_mod);
 249         if (!encoder)
 250                 return -ENOMEM;
 251
 252         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 253         if (!connector)
 254                 return -ENOMEM;
 255
 256         priv->encoders[priv->num_encoders++] = encoder;
 257         priv->connectors[priv->num_connectors++] = connector;
 258
 259         tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
 260         return 0;
 261 }
 262
 263 static const struct tilcdc_module_ops tfp410_module_ops = {
 264                 .modeset_init = tfp410_modeset_init,
 265 };
 266
 267 /*
 268  * Device:
 269  */
 270
 271 static int tfp410_probe(struct platform_device *pdev)
 272 {
 273         struct device_node *node = pdev->dev.of_node;
 274         struct device_node *i2c_node;
 275         struct tfp410_module *tfp410_mod;
 276         struct tilcdc_module *mod;
 277         struct pinctrl *pinctrl;
 278         uint32_t i2c_phandle;
 279         int ret = -EINVAL;
 280
 281         /* bail out early if no DT data: */
 282         if (!node) {
 283                 dev_err(&pdev->dev, "device-tree data is missing\n");
 284                 return -ENXIO;
 285         }
 286
 287         tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
 288         if (!tfp410_mod)
 289                 return -ENOMEM;
 290
 291         mod = &tfp410_mod->base;
 292         pdev->dev.platform_data = mod;
 293
 294         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 295
 296         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 297         if (IS_ERR(pinctrl))
 298                 dev_warn(&pdev->dev, "pins are not configured\n");
 299
 300         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 301                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 302                 goto fail;
 303         }
 304
 305         i2c_node = of_find_node_by_phandle(i2c_phandle);
 306         if (!i2c_node) {
 307                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 308                 goto fail;
 309         }
 310
 311         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 312         if (!tfp410_mod->i2c) {
 313                 dev_err(&pdev->dev, "could not get i2c\n");
 314                 of_node_put(i2c_node);
 315                 goto fail;
 316         }
 317
 318         of_node_put(i2c_node);
 319
 320         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 321                         0, NULL);
 322         if (tfp410_mod->gpio < 0) {
 323                 dev_warn(&pdev->dev, "No power down GPIO\n");
 324         } else {
 325                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 326                 if (ret) {
 327                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 328                         goto fail_adapter;
 329                 }
 330         }
 331
 332         return 0;
 333
 334 fail_adapter:
 335         i2c_put_adapter(tfp410_mod->i2c);
 336
 337 fail:
 338         tilcdc_module_cleanup(mod);
 339         return ret;
 340 }
 341
 342 static int tfp410_remove(struct platform_device *pdev)
 343 {
 344         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 345         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 346
 347         i2c_put_adapter(tfp410_mod->i2c);
 348         gpio_free(tfp410_mod->gpio);
 349
 350         tilcdc_module_cleanup(mod);
 351
 352         return 0;
 353 }
 354
 355 static const struct of_device_id tfp410_of_match[] = {
 356                 { .compatible = "ti,tilcdc,tfp410", },
 357                 { },
 358 };
 359
 360 struct platform_driver tfp410_driver = {
 361         .probe = tfp410_probe,
 362         .remove = tfp410_remove,
 363         .driver = {
 364                 .owner = THIS_MODULE,
 365                 .name = "tfp410",
 366                 .of_match_table = tfp410_of_match,
 367         },
 368 };
 369
 370 int __init tilcdc_tfp410_init(void)
 371 {
 372         return platform_driver_register(&tfp410_driver);
 373 }
 374
 375 void __exit tilcdc_tfp410_fini(void)
 376 {
 377         platform_driver_unregister(&tfp410_driver);
 378 }