1 /* 2 * Copyright (C) 2016 Texas Instruments 3 * Author: Jyri Sarha <jsarha@ti.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 */ 10 11 #include <linux/delay.h> 12 #include <linux/fwnode.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/irq.h> 15 #include <linux/module.h> 16 #include <linux/of_graph.h> 17 #include <linux/platform_device.h> 18 #include <linux/i2c.h> 19 20 #include <drm/drmP.h> 21 #include <drm/drm_atomic_helper.h> 22 #include <drm/drm_crtc.h> 23 #include <drm/drm_crtc_helper.h> 24 25 #define HOTPLUG_DEBOUNCE_MS 1100 26 27 struct tfp410 { 28 struct drm_bridge bridge; 29 struct drm_connector connector; 30 31 struct i2c_adapter *ddc; 32 struct gpio_desc *hpd; 33 struct delayed_work hpd_work; 34 35 struct device *dev; 36 }; 37 38 static inline struct tfp410 * 39 drm_bridge_to_tfp410(struct drm_bridge *bridge) 40 { 41 return container_of(bridge, struct tfp410, bridge); 42 } 43 44 static inline struct tfp410 * 45 drm_connector_to_tfp410(struct drm_connector *connector) 46 { 47 return container_of(connector, struct tfp410, connector); 48 } 49 50 static int tfp410_get_modes(struct drm_connector *connector) 51 { 52 struct tfp410 *dvi = drm_connector_to_tfp410(connector); 53 struct edid *edid; 54 int ret; 55 56 if (!dvi->ddc) 57 goto fallback; 58 59 edid = drm_get_edid(connector, dvi->ddc); 60 if (!edid) { 61 DRM_INFO("EDID read failed. Fallback to standard modes\n"); 62 goto fallback; 63 } 64 65 drm_mode_connector_update_edid_property(connector, edid); 66 67 return drm_add_edid_modes(connector, edid); 68 fallback: 69 /* No EDID, fallback on the XGA standard modes */ 70 ret = drm_add_modes_noedid(connector, 1920, 1200); 71 72 /* And prefer a mode pretty much anything can handle */ 73 drm_set_preferred_mode(connector, 1024, 768); 74 75 return ret; 76 } 77 78 static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = { 79 .get_modes = tfp410_get_modes, 80 }; 81 82 static enum drm_connector_status 83 tfp410_connector_detect(struct drm_connector *connector, bool force) 84 { 85 struct tfp410 *dvi = drm_connector_to_tfp410(connector); 86 87 if (dvi->hpd) { 88 if (gpiod_get_value_cansleep(dvi->hpd)) 89 return connector_status_connected; 90 else 91 return connector_status_disconnected; 92 } 93 94 if (dvi->ddc) { 95 if (drm_probe_ddc(dvi->ddc)) 96 return connector_status_connected; 97 else 98 return connector_status_disconnected; 99 } 100 101 return connector_status_unknown; 102 } 103 104 static const struct drm_connector_funcs tfp410_con_funcs = { 105 .dpms = drm_atomic_helper_connector_dpms, 106 .detect = tfp410_connector_detect, 107 .fill_modes = drm_helper_probe_single_connector_modes, 108 .destroy = drm_connector_cleanup, 109 .reset = drm_atomic_helper_connector_reset, 110 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 111 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 112 }; 113 114 static int tfp410_attach(struct drm_bridge *bridge) 115 { 116 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); 117 int ret; 118 119 if (!bridge->encoder) { 120 dev_err(dvi->dev, "Missing encoder\n"); 121 return -ENODEV; 122 } 123 124 if (dvi->hpd) 125 dvi->connector.polled = DRM_CONNECTOR_POLL_HPD; 126 127 drm_connector_helper_add(&dvi->connector, 128 &tfp410_con_helper_funcs); 129 ret = drm_connector_init(bridge->dev, &dvi->connector, 130 &tfp410_con_funcs, DRM_MODE_CONNECTOR_HDMIA); 131 if (ret) { 132 dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret); 133 return ret; 134 } 135 136 drm_mode_connector_attach_encoder(&dvi->connector, 137 bridge->encoder); 138 139 return 0; 140 } 141 142 static const struct drm_bridge_funcs tfp410_bridge_funcs = { 143 .attach = tfp410_attach, 144 }; 145 146 static void tfp410_hpd_work_func(struct work_struct *work) 147 { 148 struct tfp410 *dvi; 149 150 dvi = container_of(work, struct tfp410, hpd_work.work); 151 152 if (dvi->bridge.dev) 153 drm_helper_hpd_irq_event(dvi->bridge.dev); 154 } 155 156 static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg) 157 { 158 struct tfp410 *dvi = arg; 159 160 mod_delayed_work(system_wq, &dvi->hpd_work, 161 msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS)); 162 163 return IRQ_HANDLED; 164 } 165 166 static int tfp410_get_connector_properties(struct tfp410 *dvi) 167 { 168 struct device_node *connector_node, *ddc_phandle; 169 int ret = 0; 170 171 /* port@1 is the connector node */ 172 connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1); 173 if (!connector_node) 174 return -ENODEV; 175 176 dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode, 177 "hpd-gpios", 0, GPIOD_IN, "hpd"); 178 if (IS_ERR(dvi->hpd)) { 179 ret = PTR_ERR(dvi->hpd); 180 dvi->hpd = NULL; 181 if (ret == -ENOENT) 182 ret = 0; 183 else 184 goto fail; 185 } 186 187 ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0); 188 if (!ddc_phandle) 189 goto fail; 190 191 dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle); 192 if (dvi->ddc) 193 dev_info(dvi->dev, "Connector's ddc i2c bus found\n"); 194 else 195 ret = -EPROBE_DEFER; 196 197 of_node_put(ddc_phandle); 198 199 fail: 200 of_node_put(connector_node); 201 return ret; 202 } 203 204 static int tfp410_init(struct device *dev) 205 { 206 struct tfp410 *dvi; 207 int ret; 208 209 if (!dev->of_node) { 210 dev_err(dev, "device-tree data is missing\n"); 211 return -ENXIO; 212 } 213 214 dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL); 215 if (!dvi) 216 return -ENOMEM; 217 dev_set_drvdata(dev, dvi); 218 219 dvi->bridge.funcs = &tfp410_bridge_funcs; 220 dvi->bridge.of_node = dev->of_node; 221 dvi->dev = dev; 222 223 ret = tfp410_get_connector_properties(dvi); 224 if (ret) 225 goto fail; 226 227 if (dvi->hpd) { 228 INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func); 229 230 ret = devm_request_threaded_irq(dev, gpiod_to_irq(dvi->hpd), 231 NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING | 232 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 233 "hdmi-hpd", dvi); 234 if (ret) { 235 DRM_ERROR("failed to register hpd interrupt\n"); 236 goto fail; 237 } 238 } 239 240 ret = drm_bridge_add(&dvi->bridge); 241 if (ret) { 242 dev_err(dev, "drm_bridge_add() failed: %d\n", ret); 243 goto fail; 244 } 245 246 return 0; 247 fail: 248 i2c_put_adapter(dvi->ddc); 249 if (dvi->hpd) 250 gpiod_put(dvi->hpd); 251 return ret; 252 } 253 254 static int tfp410_fini(struct device *dev) 255 { 256 struct tfp410 *dvi = dev_get_drvdata(dev); 257 258 cancel_delayed_work_sync(&dvi->hpd_work); 259 260 drm_bridge_remove(&dvi->bridge); 261 262 if (dvi->ddc) 263 i2c_put_adapter(dvi->ddc); 264 if (dvi->hpd) 265 gpiod_put(dvi->hpd); 266 267 return 0; 268 } 269 270 static int tfp410_probe(struct platform_device *pdev) 271 { 272 return tfp410_init(&pdev->dev); 273 } 274 275 static int tfp410_remove(struct platform_device *pdev) 276 { 277 return tfp410_fini(&pdev->dev); 278 } 279 280 static const struct of_device_id tfp410_match[] = { 281 { .compatible = "ti,tfp410" }, 282 {}, 283 }; 284 MODULE_DEVICE_TABLE(of, tfp410_match); 285 286 static struct platform_driver tfp410_platform_driver = { 287 .probe = tfp410_probe, 288 .remove = tfp410_remove, 289 .driver = { 290 .name = "tfp410-bridge", 291 .of_match_table = tfp410_match, 292 }, 293 }; 294 295 #if IS_ENABLED(CONFIG_I2C) 296 /* There is currently no i2c functionality. */ 297 static int tfp410_i2c_probe(struct i2c_client *client, 298 const struct i2c_device_id *id) 299 { 300 int reg; 301 302 if (!client->dev.of_node || 303 of_property_read_u32(client->dev.of_node, "reg", ®)) { 304 dev_err(&client->dev, 305 "Can't get i2c reg property from device-tree\n"); 306 return -ENXIO; 307 } 308 309 return tfp410_init(&client->dev); 310 } 311 312 static int tfp410_i2c_remove(struct i2c_client *client) 313 { 314 return tfp410_fini(&client->dev); 315 } 316 317 static const struct i2c_device_id tfp410_i2c_ids[] = { 318 { "tfp410", 0 }, 319 { } 320 }; 321 MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids); 322 323 static struct i2c_driver tfp410_i2c_driver = { 324 .driver = { 325 .name = "tfp410", 326 .of_match_table = of_match_ptr(tfp410_match), 327 }, 328 .id_table = tfp410_i2c_ids, 329 .probe = tfp410_i2c_probe, 330 .remove = tfp410_i2c_remove, 331 }; 332 #endif /* IS_ENABLED(CONFIG_I2C) */ 333 334 static struct { 335 uint i2c:1; 336 uint platform:1; 337 } tfp410_registered_driver; 338 339 static int __init tfp410_module_init(void) 340 { 341 int ret; 342 343 #if IS_ENABLED(CONFIG_I2C) 344 ret = i2c_add_driver(&tfp410_i2c_driver); 345 if (ret) 346 pr_err("%s: registering i2c driver failed: %d", 347 __func__, ret); 348 else 349 tfp410_registered_driver.i2c = 1; 350 #endif 351 352 ret = platform_driver_register(&tfp410_platform_driver); 353 if (ret) 354 pr_err("%s: registering platform driver failed: %d", 355 __func__, ret); 356 else 357 tfp410_registered_driver.platform = 1; 358 359 if (tfp410_registered_driver.i2c || 360 tfp410_registered_driver.platform) 361 return 0; 362 363 return ret; 364 } 365 module_init(tfp410_module_init); 366 367 static void __exit tfp410_module_exit(void) 368 { 369 #if IS_ENABLED(CONFIG_I2C) 370 if (tfp410_registered_driver.i2c) 371 i2c_del_driver(&tfp410_i2c_driver); 372 #endif 373 if (tfp410_registered_driver.platform) 374 platform_driver_unregister(&tfp410_platform_driver); 375 } 376 module_exit(tfp410_module_exit); 377 378 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>"); 379 MODULE_DESCRIPTION("TI TFP410 DVI bridge driver"); 380 MODULE_LICENSE("GPL"); 381