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 <robdclark@gmail.com>
   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 int tfp410_connector_mode_valid(struct drm_connector *connector,
 179                   struct drm_display_mode *mode)
 180 {
 181         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 182         /* our only constraints are what the crtc can generate: */
 183         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 184 }
 185
 186 static struct drm_encoder *tfp410_connector_best_encoder(
 187                 struct drm_connector *connector)
 188 {
 189         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 190         return tfp410_connector->encoder;
 191 }
 192
 193 static const struct drm_connector_funcs tfp410_connector_funcs = {
 194         .destroy            = tfp410_connector_destroy,
 195         .detect             = tfp410_connector_detect,
 196         .fill_modes         = drm_helper_probe_single_connector_modes,
 197         .reset              = drm_atomic_helper_connector_reset,
 198         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 199         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 200 };
 201
 202 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 203         .get_modes          = tfp410_connector_get_modes,
 204         .mode_valid         = tfp410_connector_mode_valid,
 205         .best_encoder       = tfp410_connector_best_encoder,
 206 };
 207
 208 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 209                 struct tfp410_module *mod, struct drm_encoder *encoder)
 210 {
 211         struct tfp410_connector *tfp410_connector;
 212         struct drm_connector *connector;
 213         int ret;
 214
 215         tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 216                                         GFP_KERNEL);
 217         if (!tfp410_connector)
 218                 return NULL;
 219
 220         tfp410_connector->encoder = encoder;
 221         tfp410_connector->mod = mod;
 222
 223         connector = &tfp410_connector->base;
 224
 225         drm_connector_init(dev, connector, &tfp410_connector_funcs,
 226                         DRM_MODE_CONNECTOR_DVID);
 227         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 228
 229         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 230                         DRM_CONNECTOR_POLL_DISCONNECT;
 231
 232         connector->interlace_allowed = 0;
 233         connector->doublescan_allowed = 0;
 234
 235         ret = drm_connector_attach_encoder(connector, encoder);
 236         if (ret)
 237                 goto fail;
 238
 239         return connector;
 240
 241 fail:
 242         tfp410_connector_destroy(connector);
 243         return NULL;
 244 }
 245
 246 /*
 247  * Module:
 248  */
 249
 250 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 251 {
 252         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 253         struct tilcdc_drm_private *priv = dev->dev_private;
 254         struct drm_encoder *encoder;
 255         struct drm_connector *connector;
 256
 257         encoder = tfp410_encoder_create(dev, tfp410_mod);
 258         if (!encoder)
 259                 return -ENOMEM;
 260
 261         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 262         if (!connector)
 263                 return -ENOMEM;
 264
 265         priv->encoders[priv->num_encoders++] = encoder;
 266         priv->connectors[priv->num_connectors++] = connector;
 267
 268         tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
 269         return 0;
 270 }
 271
 272 static const struct tilcdc_module_ops tfp410_module_ops = {
 273                 .modeset_init = tfp410_modeset_init,
 274 };
 275
 276 /*
 277  * Device:
 278  */
 279
 280 static int tfp410_probe(struct platform_device *pdev)
 281 {
 282         struct device_node *node = pdev->dev.of_node;
 283         struct device_node *i2c_node;
 284         struct tfp410_module *tfp410_mod;
 285         struct tilcdc_module *mod;
 286         struct pinctrl *pinctrl;
 287         uint32_t i2c_phandle;
 288         int ret = -EINVAL;
 289
 290         /* bail out early if no DT data: */
 291         if (!node) {
 292                 dev_err(&pdev->dev, "device-tree data is missing\n");
 293                 return -ENXIO;
 294         }
 295
 296         tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
 297         if (!tfp410_mod)
 298                 return -ENOMEM;
 299
 300         mod = &tfp410_mod->base;
 301         pdev->dev.platform_data = mod;
 302
 303         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 304
 305         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 306         if (IS_ERR(pinctrl))
 307                 dev_warn(&pdev->dev, "pins are not configured\n");
 308
 309         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 310                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 311                 goto fail;
 312         }
 313
 314         i2c_node = of_find_node_by_phandle(i2c_phandle);
 315         if (!i2c_node) {
 316                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 317                 goto fail;
 318         }
 319
 320         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 321         if (!tfp410_mod->i2c) {
 322                 dev_err(&pdev->dev, "could not get i2c\n");
 323                 of_node_put(i2c_node);
 324                 goto fail;
 325         }
 326
 327         of_node_put(i2c_node);
 328
 329         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 330                         0, NULL);
 331         if (tfp410_mod->gpio < 0) {
 332                 dev_warn(&pdev->dev, "No power down GPIO\n");
 333         } else {
 334                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 335                 if (ret) {
 336                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 337                         goto fail_adapter;
 338                 }
 339         }
 340
 341         return 0;
 342
 343 fail_adapter:
 344         i2c_put_adapter(tfp410_mod->i2c);
 345
 346 fail:
 347         tilcdc_module_cleanup(mod);
 348         return ret;
 349 }
 350
 351 static int tfp410_remove(struct platform_device *pdev)
 352 {
 353         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 354         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 355
 356         i2c_put_adapter(tfp410_mod->i2c);
 357         gpio_free(tfp410_mod->gpio);
 358
 359         tilcdc_module_cleanup(mod);
 360
 361         return 0;
 362 }
 363
 364 static const struct of_device_id tfp410_of_match[] = {
 365                 { .compatible = "ti,tilcdc,tfp410", },
 366                 { },
 367 };
 368
 369 struct platform_driver tfp410_driver = {
 370         .probe = tfp410_probe,
 371         .remove = tfp410_remove,
 372         .driver = {
 373                 .owner = THIS_MODULE,
 374                 .name = "tfp410",
 375                 .of_match_table = tfp410_of_match,
 376         },
 377 };
 378
 379 int __init tilcdc_tfp410_init(void)
 380 {
 381         return platform_driver_register(&tfp410_driver);
 382 }
 383
 384 void __exit tilcdc_tfp410_fini(void)
 385 {
 386         platform_driver_unregister(&tfp410_driver);
 387 }