1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2016 Texas Instruments 4 * Author: Jyri Sarha <jsarha@ti.com> 5 */ 6 7 #include <linux/delay.h> 8 #include <linux/fwnode.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/irq.h> 11 #include <linux/module.h> 12 #include <linux/of_graph.h> 13 #include <linux/platform_device.h> 14 #include <linux/i2c.h> 15 16 #include <drm/drmP.h> 17 #include <drm/drm_atomic_helper.h> 18 #include <drm/drm_crtc.h> 19 #include <drm/drm_probe_helper.h> 20 21 #define HOTPLUG_DEBOUNCE_MS 1100 22 23 struct tfp410 { 24 struct drm_bridge bridge; 25 struct drm_connector connector; 26 unsigned int connector_type; 27 28 u32 bus_format; 29 struct i2c_adapter *ddc; 30 struct gpio_desc *hpd; 31 int hpd_irq; 32 struct delayed_work hpd_work; 33 struct gpio_desc *powerdown; 34 35 struct drm_bridge_timings timings; 36 37 struct device *dev; 38 }; 39 40 static inline struct tfp410 * 41 drm_bridge_to_tfp410(struct drm_bridge *bridge) 42 { 43 return container_of(bridge, struct tfp410, bridge); 44 } 45 46 static inline struct tfp410 * 47 drm_connector_to_tfp410(struct drm_connector *connector) 48 { 49 return container_of(connector, struct tfp410, connector); 50 } 51 52 static int tfp410_get_modes(struct drm_connector *connector) 53 { 54 struct tfp410 *dvi = drm_connector_to_tfp410(connector); 55 struct edid *edid; 56 int ret; 57 58 if (!dvi->ddc) 59 goto fallback; 60 61 edid = drm_get_edid(connector, dvi->ddc); 62 if (!edid) { 63 DRM_INFO("EDID read failed. Fallback to standard modes\n"); 64 goto fallback; 65 } 66 67 drm_connector_update_edid_property(connector, edid); 68 69 return drm_add_edid_modes(connector, edid); 70 fallback: 71 /* No EDID, fallback on the XGA standard modes */ 72 ret = drm_add_modes_noedid(connector, 1920, 1200); 73 74 /* And prefer a mode pretty much anything can handle */ 75 drm_set_preferred_mode(connector, 1024, 768); 76 77 return ret; 78 } 79 80 static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = { 81 .get_modes = tfp410_get_modes, 82 }; 83 84 static enum drm_connector_status 85 tfp410_connector_detect(struct drm_connector *connector, bool force) 86 { 87 struct tfp410 *dvi = drm_connector_to_tfp410(connector); 88 89 if (dvi->hpd) { 90 if (gpiod_get_value_cansleep(dvi->hpd)) 91 return connector_status_connected; 92 else 93 return connector_status_disconnected; 94 } 95 96 if (dvi->ddc) { 97 if (drm_probe_ddc(dvi->ddc)) 98 return connector_status_connected; 99 else 100 return connector_status_disconnected; 101 } 102 103 return connector_status_unknown; 104 } 105 106 static const struct drm_connector_funcs tfp410_con_funcs = { 107 .detect = tfp410_connector_detect, 108 .fill_modes = drm_helper_probe_single_connector_modes, 109 .destroy = drm_connector_cleanup, 110 .reset = drm_atomic_helper_connector_reset, 111 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 112 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 113 }; 114 115 static int tfp410_attach(struct drm_bridge *bridge) 116 { 117 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); 118 int ret; 119 120 if (!bridge->encoder) { 121 dev_err(dvi->dev, "Missing encoder\n"); 122 return -ENODEV; 123 } 124 125 if (dvi->hpd_irq >= 0) 126 dvi->connector.polled = DRM_CONNECTOR_POLL_HPD; 127 else 128 dvi->connector.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; 129 130 drm_connector_helper_add(&dvi->connector, 131 &tfp410_con_helper_funcs); 132 ret = drm_connector_init(bridge->dev, &dvi->connector, 133 &tfp410_con_funcs, dvi->connector_type); 134 if (ret) { 135 dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret); 136 return ret; 137 } 138 139 drm_display_info_set_bus_formats(&dvi->connector.display_info, 140 &dvi->bus_format, 1); 141 142 drm_connector_attach_encoder(&dvi->connector, 143 bridge->encoder); 144 145 return 0; 146 } 147 148 static void tfp410_enable(struct drm_bridge *bridge) 149 { 150 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); 151 152 gpiod_set_value_cansleep(dvi->powerdown, 0); 153 } 154 155 static void tfp410_disable(struct drm_bridge *bridge) 156 { 157 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); 158 159 gpiod_set_value_cansleep(dvi->powerdown, 1); 160 } 161 162 static const struct drm_bridge_funcs tfp410_bridge_funcs = { 163 .attach = tfp410_attach, 164 .enable = tfp410_enable, 165 .disable = tfp410_disable, 166 }; 167 168 static void tfp410_hpd_work_func(struct work_struct *work) 169 { 170 struct tfp410 *dvi; 171 172 dvi = container_of(work, struct tfp410, hpd_work.work); 173 174 if (dvi->bridge.dev) 175 drm_helper_hpd_irq_event(dvi->bridge.dev); 176 } 177 178 static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg) 179 { 180 struct tfp410 *dvi = arg; 181 182 mod_delayed_work(system_wq, &dvi->hpd_work, 183 msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS)); 184 185 return IRQ_HANDLED; 186 } 187 188 static const struct drm_bridge_timings tfp410_default_timings = { 189 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE 190 | DRM_BUS_FLAG_DE_HIGH, 191 .setup_time_ps = 1200, 192 .hold_time_ps = 1300, 193 }; 194 195 static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c) 196 { 197 struct drm_bridge_timings *timings = &dvi->timings; 198 struct device_node *ep; 199 u32 pclk_sample = 0; 200 u32 bus_width = 24; 201 s32 deskew = 0; 202 203 /* Start with defaults. */ 204 *timings = tfp410_default_timings; 205 206 if (i2c) 207 /* 208 * In I2C mode timings are configured through the I2C interface. 209 * As the driver doesn't support I2C configuration yet, we just 210 * go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1). 211 */ 212 return 0; 213 214 /* 215 * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN 216 * and EDGE pins. They are specified in DT through endpoint properties 217 * and vendor-specific properties. 218 */ 219 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0); 220 if (!ep) 221 return -EINVAL; 222 223 /* Get the sampling edge from the endpoint. */ 224 of_property_read_u32(ep, "pclk-sample", &pclk_sample); 225 of_property_read_u32(ep, "bus-width", &bus_width); 226 of_node_put(ep); 227 228 timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH; 229 230 switch (pclk_sample) { 231 case 0: 232 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE 233 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE; 234 break; 235 case 1: 236 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE 237 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE; 238 break; 239 default: 240 return -EINVAL; 241 } 242 243 switch (bus_width) { 244 case 12: 245 dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE; 246 break; 247 case 24: 248 dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24; 249 break; 250 default: 251 return -EINVAL; 252 } 253 254 /* Get the setup and hold time from vendor-specific properties. */ 255 of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew); 256 if (deskew < -4 || deskew > 3) 257 return -EINVAL; 258 259 timings->setup_time_ps = min(0, 1200 - 350 * deskew); 260 timings->hold_time_ps = min(0, 1300 + 350 * deskew); 261 262 return 0; 263 } 264 265 static int tfp410_get_connector_properties(struct tfp410 *dvi) 266 { 267 struct device_node *connector_node, *ddc_phandle; 268 int ret = 0; 269 270 /* port@1 is the connector node */ 271 connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1); 272 if (!connector_node) 273 return -ENODEV; 274 275 if (of_device_is_compatible(connector_node, "hdmi-connector")) 276 dvi->connector_type = DRM_MODE_CONNECTOR_HDMIA; 277 else 278 dvi->connector_type = DRM_MODE_CONNECTOR_DVID; 279 280 dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode, 281 "hpd-gpios", 0, GPIOD_IN, "hpd"); 282 if (IS_ERR(dvi->hpd)) { 283 ret = PTR_ERR(dvi->hpd); 284 dvi->hpd = NULL; 285 if (ret == -ENOENT) 286 ret = 0; 287 else 288 goto fail; 289 } 290 291 ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0); 292 if (!ddc_phandle) 293 goto fail; 294 295 dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle); 296 if (dvi->ddc) 297 dev_info(dvi->dev, "Connector's ddc i2c bus found\n"); 298 else 299 ret = -EPROBE_DEFER; 300 301 of_node_put(ddc_phandle); 302 303 fail: 304 of_node_put(connector_node); 305 return ret; 306 } 307 308 static int tfp410_init(struct device *dev, bool i2c) 309 { 310 struct tfp410 *dvi; 311 int ret; 312 313 if (!dev->of_node) { 314 dev_err(dev, "device-tree data is missing\n"); 315 return -ENXIO; 316 } 317 318 dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL); 319 if (!dvi) 320 return -ENOMEM; 321 dev_set_drvdata(dev, dvi); 322 323 dvi->bridge.funcs = &tfp410_bridge_funcs; 324 dvi->bridge.of_node = dev->of_node; 325 dvi->bridge.timings = &dvi->timings; 326 dvi->dev = dev; 327 328 ret = tfp410_parse_timings(dvi, i2c); 329 if (ret) 330 goto fail; 331 332 ret = tfp410_get_connector_properties(dvi); 333 if (ret) 334 goto fail; 335 336 dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown", 337 GPIOD_OUT_HIGH); 338 if (IS_ERR(dvi->powerdown)) { 339 dev_err(dev, "failed to parse powerdown gpio\n"); 340 return PTR_ERR(dvi->powerdown); 341 } 342 343 if (dvi->hpd) 344 dvi->hpd_irq = gpiod_to_irq(dvi->hpd); 345 else 346 dvi->hpd_irq = -ENXIO; 347 348 if (dvi->hpd_irq >= 0) { 349 INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func); 350 351 ret = devm_request_threaded_irq(dev, dvi->hpd_irq, 352 NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING | 353 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 354 "hdmi-hpd", dvi); 355 if (ret) { 356 DRM_ERROR("failed to register hpd interrupt\n"); 357 goto fail; 358 } 359 } 360 361 drm_bridge_add(&dvi->bridge); 362 363 return 0; 364 fail: 365 i2c_put_adapter(dvi->ddc); 366 if (dvi->hpd) 367 gpiod_put(dvi->hpd); 368 return ret; 369 } 370 371 static int tfp410_fini(struct device *dev) 372 { 373 struct tfp410 *dvi = dev_get_drvdata(dev); 374 375 cancel_delayed_work_sync(&dvi->hpd_work); 376 377 drm_bridge_remove(&dvi->bridge); 378 379 if (dvi->ddc) 380 i2c_put_adapter(dvi->ddc); 381 if (dvi->hpd) 382 gpiod_put(dvi->hpd); 383 384 return 0; 385 } 386 387 static int tfp410_probe(struct platform_device *pdev) 388 { 389 return tfp410_init(&pdev->dev, false); 390 } 391 392 static int tfp410_remove(struct platform_device *pdev) 393 { 394 return tfp410_fini(&pdev->dev); 395 } 396 397 static const struct of_device_id tfp410_match[] = { 398 { .compatible = "ti,tfp410" }, 399 {}, 400 }; 401 MODULE_DEVICE_TABLE(of, tfp410_match); 402 403 static struct platform_driver tfp410_platform_driver = { 404 .probe = tfp410_probe, 405 .remove = tfp410_remove, 406 .driver = { 407 .name = "tfp410-bridge", 408 .of_match_table = tfp410_match, 409 }, 410 }; 411 412 #if IS_ENABLED(CONFIG_I2C) 413 /* There is currently no i2c functionality. */ 414 static int tfp410_i2c_probe(struct i2c_client *client, 415 const struct i2c_device_id *id) 416 { 417 int reg; 418 419 if (!client->dev.of_node || 420 of_property_read_u32(client->dev.of_node, "reg", ®)) { 421 dev_err(&client->dev, 422 "Can't get i2c reg property from device-tree\n"); 423 return -ENXIO; 424 } 425 426 return tfp410_init(&client->dev, true); 427 } 428 429 static int tfp410_i2c_remove(struct i2c_client *client) 430 { 431 return tfp410_fini(&client->dev); 432 } 433 434 static const struct i2c_device_id tfp410_i2c_ids[] = { 435 { "tfp410", 0 }, 436 { } 437 }; 438 MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids); 439 440 static struct i2c_driver tfp410_i2c_driver = { 441 .driver = { 442 .name = "tfp410", 443 .of_match_table = of_match_ptr(tfp410_match), 444 }, 445 .id_table = tfp410_i2c_ids, 446 .probe = tfp410_i2c_probe, 447 .remove = tfp410_i2c_remove, 448 }; 449 #endif /* IS_ENABLED(CONFIG_I2C) */ 450 451 static struct { 452 uint i2c:1; 453 uint platform:1; 454 } tfp410_registered_driver; 455 456 static int __init tfp410_module_init(void) 457 { 458 int ret; 459 460 #if IS_ENABLED(CONFIG_I2C) 461 ret = i2c_add_driver(&tfp410_i2c_driver); 462 if (ret) 463 pr_err("%s: registering i2c driver failed: %d", 464 __func__, ret); 465 else 466 tfp410_registered_driver.i2c = 1; 467 #endif 468 469 ret = platform_driver_register(&tfp410_platform_driver); 470 if (ret) 471 pr_err("%s: registering platform driver failed: %d", 472 __func__, ret); 473 else 474 tfp410_registered_driver.platform = 1; 475 476 if (tfp410_registered_driver.i2c || 477 tfp410_registered_driver.platform) 478 return 0; 479 480 return ret; 481 } 482 module_init(tfp410_module_init); 483 484 static void __exit tfp410_module_exit(void) 485 { 486 #if IS_ENABLED(CONFIG_I2C) 487 if (tfp410_registered_driver.i2c) 488 i2c_del_driver(&tfp410_i2c_driver); 489 #endif 490 if (tfp410_registered_driver.platform) 491 platform_driver_unregister(&tfp410_platform_driver); 492 } 493 module_exit(tfp410_module_exit); 494 495 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>"); 496 MODULE_DESCRIPTION("TI TFP410 DVI bridge driver"); 497 MODULE_LICENSE("GPL"); 498