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/pinctrl/consumer.h>
  11 #include <linux/platform_device.h>
  12
  13 #include <drm/drm_atomic_helper.h>
  14 #include <drm/drm_encoder.h>
  15 #include <drm/drm_modeset_helper_vtables.h>
  16 #include <drm/drm_probe_helper.h>
  17
  18 #include "tilcdc_drv.h"
  19 #include "tilcdc_tfp410.h"
  20
  21 struct tfp410_module {
  22         struct tilcdc_module base;
  23         struct i2c_adapter *i2c;
  24         int gpio;
  25 };
  26 #define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
  27
  28
  29 static const struct tilcdc_panel_info dvi_info = {
  30                 .ac_bias                = 255,
  31                 .ac_bias_intrpt         = 0,
  32                 .dma_burst_sz           = 16,
  33                 .bpp                    = 16,
  34                 .fdd                    = 0x80,
  35                 .tft_alt_mode           = 0,
  36                 .sync_edge              = 0,
  37                 .sync_ctrl              = 1,
  38                 .raster_order           = 0,
  39 };
  40
  41 /*
  42  * Encoder:
  43  */
  44
  45 struct tfp410_encoder {
  46         struct drm_encoder base;
  47         struct tfp410_module *mod;
  48         int dpms;
  49 };
  50 #define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
  51
  52 static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
  53 {
  54         struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
  55
  56         if (tfp410_encoder->dpms == mode)
  57                 return;
  58
  59         if (mode == DRM_MODE_DPMS_ON) {
  60                 DBG("Power on");
  61                 gpio_direction_output(tfp410_encoder->mod->gpio, 1);
  62         } else {
  63                 DBG("Power off");
  64                 gpio_direction_output(tfp410_encoder->mod->gpio, 0);
  65         }
  66
  67         tfp410_encoder->dpms = mode;
  68 }
  69
  70 static void tfp410_encoder_prepare(struct drm_encoder *encoder)
  71 {
  72         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  73 }
  74
  75 static void tfp410_encoder_commit(struct drm_encoder *encoder)
  76 {
  77         tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  78 }
  79
  80 static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
  81                 struct drm_display_mode *mode,
  82                 struct drm_display_mode *adjusted_mode)
  83 {
  84         /* nothing needed */
  85 }
  86
  87 static const struct drm_encoder_funcs tfp410_encoder_funcs = {
  88                 .destroy        = drm_encoder_cleanup,
  89 };
  90
  91 static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
  92                 .dpms           = tfp410_encoder_dpms,
  93                 .prepare        = tfp410_encoder_prepare,
  94                 .commit         = tfp410_encoder_commit,
  95                 .mode_set       = tfp410_encoder_mode_set,
  96 };
  97
  98 static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
  99                 struct tfp410_module *mod)
 100 {
 101         struct tfp410_encoder *tfp410_encoder;
 102         struct drm_encoder *encoder;
 103         int ret;
 104
 105         tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
 106                                       GFP_KERNEL);
 107         if (!tfp410_encoder)
 108                 return NULL;
 109
 110         tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 111         tfp410_encoder->mod = mod;
 112
 113         encoder = &tfp410_encoder->base;
 114         encoder->possible_crtcs = 1;
 115
 116         ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
 117                         DRM_MODE_ENCODER_TMDS, NULL);
 118         if (ret < 0)
 119                 goto fail;
 120
 121         drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
 122
 123         return encoder;
 124
 125 fail:
 126         drm_encoder_cleanup(encoder);
 127         return NULL;
 128 }
 129
 130 /*
 131  * Connector:
 132  */
 133
 134 struct tfp410_connector {
 135         struct drm_connector base;
 136
 137         struct drm_encoder *encoder;  /* our connected encoder */
 138         struct tfp410_module *mod;
 139 };
 140 #define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
 141
 142
 143 static void tfp410_connector_destroy(struct drm_connector *connector)
 144 {
 145         drm_connector_unregister(connector);
 146         drm_connector_cleanup(connector);
 147 }
 148
 149 static enum drm_connector_status tfp410_connector_detect(
 150                 struct drm_connector *connector,
 151                 bool force)
 152 {
 153         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 154
 155         if (drm_probe_ddc(tfp410_connector->mod->i2c))
 156                 return connector_status_connected;
 157
 158         return connector_status_unknown;
 159 }
 160
 161 static int tfp410_connector_get_modes(struct drm_connector *connector)
 162 {
 163         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 164         struct edid *edid;
 165         int ret = 0;
 166
 167         edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
 168
 169         drm_connector_update_edid_property(connector, edid);
 170
 171         if (edid) {
 172                 ret = drm_add_edid_modes(connector, edid);
 173                 kfree(edid);
 174         }
 175
 176         return ret;
 177 }
 178
 179 static struct drm_encoder *tfp410_connector_best_encoder(
 180                 struct drm_connector *connector)
 181 {
 182         struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
 183         return tfp410_connector->encoder;
 184 }
 185
 186 static const struct drm_connector_funcs tfp410_connector_funcs = {
 187         .destroy            = tfp410_connector_destroy,
 188         .detect             = tfp410_connector_detect,
 189         .fill_modes         = drm_helper_probe_single_connector_modes,
 190         .reset              = drm_atomic_helper_connector_reset,
 191         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 192         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 193 };
 194
 195 static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
 196         .get_modes          = tfp410_connector_get_modes,
 197         .best_encoder       = tfp410_connector_best_encoder,
 198 };
 199
 200 static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 201                 struct tfp410_module *mod, struct drm_encoder *encoder)
 202 {
 203         struct tfp410_connector *tfp410_connector;
 204         struct drm_connector *connector;
 205         int ret;
 206
 207         tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 208                                         GFP_KERNEL);
 209         if (!tfp410_connector)
 210                 return NULL;
 211
 212         tfp410_connector->encoder = encoder;
 213         tfp410_connector->mod = mod;
 214
 215         connector = &tfp410_connector->base;
 216
 217         drm_connector_init_with_ddc(dev, connector,
 218                                     &tfp410_connector_funcs,
 219                                     DRM_MODE_CONNECTOR_DVID,
 220                                     mod->i2c);
 221         drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
 222
 223         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 224                         DRM_CONNECTOR_POLL_DISCONNECT;
 225
 226         connector->interlace_allowed = 0;
 227         connector->doublescan_allowed = 0;
 228
 229         ret = drm_connector_attach_encoder(connector, encoder);
 230         if (ret)
 231                 goto fail;
 232
 233         return connector;
 234
 235 fail:
 236         tfp410_connector_destroy(connector);
 237         return NULL;
 238 }
 239
 240 /*
 241  * Module:
 242  */
 243
 244 static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 245 {
 246         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 247         struct tilcdc_drm_private *priv = dev->dev_private;
 248         struct drm_encoder *encoder;
 249         struct drm_connector *connector;
 250
 251         encoder = tfp410_encoder_create(dev, tfp410_mod);
 252         if (!encoder)
 253                 return -ENOMEM;
 254
 255         connector = tfp410_connector_create(dev, tfp410_mod, encoder);
 256         if (!connector)
 257                 return -ENOMEM;
 258
 259         priv->encoders[priv->num_encoders++] = encoder;
 260         priv->connectors[priv->num_connectors++] = connector;
 261
 262         tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
 263         return 0;
 264 }
 265
 266 static const struct tilcdc_module_ops tfp410_module_ops = {
 267                 .modeset_init = tfp410_modeset_init,
 268 };
 269
 270 /*
 271  * Device:
 272  */
 273
 274 static int tfp410_probe(struct platform_device *pdev)
 275 {
 276         struct device_node *node = pdev->dev.of_node;
 277         struct device_node *i2c_node;
 278         struct tfp410_module *tfp410_mod;
 279         struct tilcdc_module *mod;
 280         struct pinctrl *pinctrl;
 281         uint32_t i2c_phandle;
 282         int ret = -EINVAL;
 283
 284         /* bail out early if no DT data: */
 285         if (!node) {
 286                 dev_err(&pdev->dev, "device-tree data is missing\n");
 287                 return -ENXIO;
 288         }
 289
 290         tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
 291         if (!tfp410_mod)
 292                 return -ENOMEM;
 293
 294         mod = &tfp410_mod->base;
 295         pdev->dev.platform_data = mod;
 296
 297         tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
 298
 299         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 300         if (IS_ERR(pinctrl))
 301                 dev_warn(&pdev->dev, "pins are not configured\n");
 302
 303         if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
 304                 dev_err(&pdev->dev, "could not get i2c bus phandle\n");
 305                 goto fail;
 306         }
 307
 308         i2c_node = of_find_node_by_phandle(i2c_phandle);
 309         if (!i2c_node) {
 310                 dev_err(&pdev->dev, "could not get i2c bus node\n");
 311                 goto fail;
 312         }
 313
 314         tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
 315         if (!tfp410_mod->i2c) {
 316                 dev_err(&pdev->dev, "could not get i2c\n");
 317                 of_node_put(i2c_node);
 318                 goto fail;
 319         }
 320
 321         of_node_put(i2c_node);
 322
 323         tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
 324                         0, NULL);
 325         if (tfp410_mod->gpio < 0) {
 326                 dev_warn(&pdev->dev, "No power down GPIO\n");
 327         } else {
 328                 ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
 329                 if (ret) {
 330                         dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
 331                         goto fail_adapter;
 332                 }
 333         }
 334
 335         return 0;
 336
 337 fail_adapter:
 338         i2c_put_adapter(tfp410_mod->i2c);
 339
 340 fail:
 341         tilcdc_module_cleanup(mod);
 342         return ret;
 343 }
 344
 345 static int tfp410_remove(struct platform_device *pdev)
 346 {
 347         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 348         struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
 349
 350         i2c_put_adapter(tfp410_mod->i2c);
 351         gpio_free(tfp410_mod->gpio);
 352
 353         tilcdc_module_cleanup(mod);
 354
 355         return 0;
 356 }
 357
 358 static const struct of_device_id tfp410_of_match[] = {
 359                 { .compatible = "ti,tilcdc,tfp410", },
 360                 { },
 361 };
 362
 363 struct platform_driver tfp410_driver = {
 364         .probe = tfp410_probe,
 365         .remove = tfp410_remove,
 366         .driver = {
 367                 .owner = THIS_MODULE,
 368                 .name = "tfp410",
 369                 .of_match_table = tfp410_of_match,
 370         },
 371 };
 372
 373 int __init tilcdc_tfp410_init(void)
 374 {
 375         return platform_driver_register(&tfp410_driver);
 376 }
 377
 378 void __exit tilcdc_tfp410_fini(void)
 379 {
 380         platform_driver_unregister(&tfp410_driver);
 381 }