Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 1 | /* |
| 2 | * TPD12S015 HDMI ESD protection & level shifter chip driver |
| 3 | * |
| 4 | * Copyright (C) 2013 Texas Instruments |
| 5 | * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as published by |
| 9 | * the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/completion.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/gpio.h> |
| 17 | #include <linux/platform_device.h> |
Tomi Valkeinen | 5e4c89c | 2013-07-30 10:37:17 +0300 | [diff] [blame] | 18 | #include <linux/of_gpio.h> |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 19 | |
| 20 | #include <video/omapdss.h> |
| 21 | #include <video/omap-panel-data.h> |
| 22 | |
| 23 | struct panel_drv_data { |
| 24 | struct omap_dss_device dssdev; |
| 25 | struct omap_dss_device *in; |
| 26 | |
| 27 | int ct_cp_hpd_gpio; |
| 28 | int ls_oe_gpio; |
| 29 | int hpd_gpio; |
| 30 | |
| 31 | struct omap_video_timings timings; |
| 32 | |
| 33 | struct completion hpd_completion; |
| 34 | }; |
| 35 | |
| 36 | #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev) |
| 37 | |
| 38 | static irqreturn_t tpd_hpd_irq_handler(int irq, void *data) |
| 39 | { |
| 40 | struct panel_drv_data *ddata = data; |
| 41 | bool hpd; |
| 42 | |
| 43 | hpd = gpio_get_value_cansleep(ddata->hpd_gpio); |
| 44 | |
| 45 | dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd); |
| 46 | |
| 47 | if (gpio_is_valid(ddata->ls_oe_gpio)) { |
| 48 | if (hpd) |
| 49 | gpio_set_value_cansleep(ddata->ls_oe_gpio, 1); |
| 50 | else |
| 51 | gpio_set_value_cansleep(ddata->ls_oe_gpio, 0); |
| 52 | } |
| 53 | |
| 54 | complete_all(&ddata->hpd_completion); |
| 55 | |
| 56 | return IRQ_HANDLED; |
| 57 | } |
| 58 | |
| 59 | static int tpd_connect(struct omap_dss_device *dssdev, |
| 60 | struct omap_dss_device *dst) |
| 61 | { |
| 62 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 63 | struct omap_dss_device *in = ddata->in; |
| 64 | int r; |
| 65 | |
| 66 | r = in->ops.hdmi->connect(in, dssdev); |
| 67 | if (r) |
| 68 | return r; |
| 69 | |
Tomi Valkeinen | a73fdc6 | 2013-07-24 13:01:34 +0300 | [diff] [blame] | 70 | dst->src = dssdev; |
Tomi Valkeinen | 9560dc10 | 2013-07-24 13:06:54 +0300 | [diff] [blame] | 71 | dssdev->dst = dst; |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 72 | |
Wolfram Sang | 16735d0 | 2013-11-14 14:32:02 -0800 | [diff] [blame] | 73 | reinit_completion(&ddata->hpd_completion); |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 74 | |
| 75 | gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1); |
| 76 | /* DC-DC converter needs at max 300us to get to 90% of 5V */ |
| 77 | udelay(300); |
| 78 | |
| 79 | /* |
| 80 | * If there's a cable connected, wait for the hpd irq to trigger, |
| 81 | * which turns on the level shifters. |
| 82 | */ |
| 83 | if (gpio_get_value_cansleep(ddata->hpd_gpio)) { |
| 84 | unsigned long to; |
| 85 | to = wait_for_completion_timeout(&ddata->hpd_completion, |
| 86 | msecs_to_jiffies(250)); |
| 87 | WARN_ON_ONCE(to == 0); |
| 88 | } |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static void tpd_disconnect(struct omap_dss_device *dssdev, |
| 94 | struct omap_dss_device *dst) |
| 95 | { |
| 96 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 97 | struct omap_dss_device *in = ddata->in; |
| 98 | |
Tomi Valkeinen | 9560dc10 | 2013-07-24 13:06:54 +0300 | [diff] [blame] | 99 | WARN_ON(dst != dssdev->dst); |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 100 | |
Tomi Valkeinen | 9560dc10 | 2013-07-24 13:06:54 +0300 | [diff] [blame] | 101 | if (dst != dssdev->dst) |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 102 | return; |
| 103 | |
| 104 | gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0); |
| 105 | |
Tomi Valkeinen | a73fdc6 | 2013-07-24 13:01:34 +0300 | [diff] [blame] | 106 | dst->src = NULL; |
Tomi Valkeinen | 9560dc10 | 2013-07-24 13:06:54 +0300 | [diff] [blame] | 107 | dssdev->dst = NULL; |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 108 | |
| 109 | in->ops.hdmi->disconnect(in, &ddata->dssdev); |
| 110 | } |
| 111 | |
| 112 | static int tpd_enable(struct omap_dss_device *dssdev) |
| 113 | { |
| 114 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 115 | struct omap_dss_device *in = ddata->in; |
| 116 | int r; |
| 117 | |
| 118 | if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) |
| 119 | return 0; |
| 120 | |
| 121 | in->ops.hdmi->set_timings(in, &ddata->timings); |
| 122 | |
| 123 | r = in->ops.hdmi->enable(in); |
| 124 | if (r) |
| 125 | return r; |
| 126 | |
| 127 | dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; |
| 128 | |
| 129 | return r; |
| 130 | } |
| 131 | |
| 132 | static void tpd_disable(struct omap_dss_device *dssdev) |
| 133 | { |
| 134 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 135 | struct omap_dss_device *in = ddata->in; |
| 136 | |
| 137 | if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) |
| 138 | return; |
| 139 | |
| 140 | in->ops.hdmi->disable(in); |
| 141 | |
| 142 | dssdev->state = OMAP_DSS_DISPLAY_DISABLED; |
| 143 | } |
| 144 | |
| 145 | static void tpd_set_timings(struct omap_dss_device *dssdev, |
| 146 | struct omap_video_timings *timings) |
| 147 | { |
| 148 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 149 | struct omap_dss_device *in = ddata->in; |
| 150 | |
| 151 | ddata->timings = *timings; |
| 152 | dssdev->panel.timings = *timings; |
| 153 | |
| 154 | in->ops.hdmi->set_timings(in, timings); |
| 155 | } |
| 156 | |
| 157 | static void tpd_get_timings(struct omap_dss_device *dssdev, |
| 158 | struct omap_video_timings *timings) |
| 159 | { |
| 160 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 161 | |
| 162 | *timings = ddata->timings; |
| 163 | } |
| 164 | |
| 165 | static int tpd_check_timings(struct omap_dss_device *dssdev, |
| 166 | struct omap_video_timings *timings) |
| 167 | { |
| 168 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 169 | struct omap_dss_device *in = ddata->in; |
| 170 | int r; |
| 171 | |
| 172 | r = in->ops.hdmi->check_timings(in, timings); |
| 173 | |
| 174 | return r; |
| 175 | } |
| 176 | |
| 177 | static int tpd_read_edid(struct omap_dss_device *dssdev, |
| 178 | u8 *edid, int len) |
| 179 | { |
| 180 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 181 | struct omap_dss_device *in = ddata->in; |
| 182 | |
| 183 | if (!gpio_get_value_cansleep(ddata->hpd_gpio)) |
| 184 | return -ENODEV; |
| 185 | |
| 186 | return in->ops.hdmi->read_edid(in, edid, len); |
| 187 | } |
| 188 | |
| 189 | static bool tpd_detect(struct omap_dss_device *dssdev) |
| 190 | { |
| 191 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 192 | |
| 193 | return gpio_get_value_cansleep(ddata->hpd_gpio); |
| 194 | } |
| 195 | |
| 196 | static int tpd_audio_enable(struct omap_dss_device *dssdev) |
| 197 | { |
| 198 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 199 | struct omap_dss_device *in = ddata->in; |
| 200 | |
| 201 | return in->ops.hdmi->audio_enable(in); |
| 202 | } |
| 203 | |
| 204 | static void tpd_audio_disable(struct omap_dss_device *dssdev) |
| 205 | { |
| 206 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 207 | struct omap_dss_device *in = ddata->in; |
| 208 | |
| 209 | in->ops.hdmi->audio_disable(in); |
| 210 | } |
| 211 | |
| 212 | static int tpd_audio_start(struct omap_dss_device *dssdev) |
| 213 | { |
| 214 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 215 | struct omap_dss_device *in = ddata->in; |
| 216 | |
| 217 | return in->ops.hdmi->audio_start(in); |
| 218 | } |
| 219 | |
| 220 | static void tpd_audio_stop(struct omap_dss_device *dssdev) |
| 221 | { |
| 222 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 223 | struct omap_dss_device *in = ddata->in; |
| 224 | |
| 225 | in->ops.hdmi->audio_stop(in); |
| 226 | } |
| 227 | |
| 228 | static bool tpd_audio_supported(struct omap_dss_device *dssdev) |
| 229 | { |
| 230 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 231 | struct omap_dss_device *in = ddata->in; |
| 232 | |
| 233 | return in->ops.hdmi->audio_supported(in); |
| 234 | } |
| 235 | |
| 236 | static int tpd_audio_config(struct omap_dss_device *dssdev, |
| 237 | struct omap_dss_audio *audio) |
| 238 | { |
| 239 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 240 | struct omap_dss_device *in = ddata->in; |
| 241 | |
| 242 | return in->ops.hdmi->audio_config(in, audio); |
| 243 | } |
| 244 | |
| 245 | static const struct omapdss_hdmi_ops tpd_hdmi_ops = { |
| 246 | .connect = tpd_connect, |
| 247 | .disconnect = tpd_disconnect, |
| 248 | |
| 249 | .enable = tpd_enable, |
| 250 | .disable = tpd_disable, |
| 251 | |
| 252 | .check_timings = tpd_check_timings, |
| 253 | .set_timings = tpd_set_timings, |
| 254 | .get_timings = tpd_get_timings, |
| 255 | |
| 256 | .read_edid = tpd_read_edid, |
| 257 | .detect = tpd_detect, |
| 258 | |
| 259 | .audio_enable = tpd_audio_enable, |
| 260 | .audio_disable = tpd_audio_disable, |
| 261 | .audio_start = tpd_audio_start, |
| 262 | .audio_stop = tpd_audio_stop, |
| 263 | .audio_supported = tpd_audio_supported, |
| 264 | .audio_config = tpd_audio_config, |
| 265 | }; |
| 266 | |
| 267 | static int tpd_probe_pdata(struct platform_device *pdev) |
| 268 | { |
| 269 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); |
| 270 | struct encoder_tpd12s015_platform_data *pdata; |
| 271 | struct omap_dss_device *dssdev, *in; |
| 272 | |
| 273 | pdata = dev_get_platdata(&pdev->dev); |
| 274 | |
| 275 | ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio; |
| 276 | ddata->ls_oe_gpio = pdata->ls_oe_gpio; |
| 277 | ddata->hpd_gpio = pdata->hpd_gpio; |
| 278 | |
| 279 | in = omap_dss_find_output(pdata->source); |
| 280 | if (in == NULL) { |
| 281 | dev_err(&pdev->dev, "Failed to find video source\n"); |
| 282 | return -ENODEV; |
| 283 | } |
| 284 | |
| 285 | ddata->in = in; |
| 286 | |
| 287 | dssdev = &ddata->dssdev; |
| 288 | dssdev->name = pdata->name; |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
Tomi Valkeinen | 5e4c89c | 2013-07-30 10:37:17 +0300 | [diff] [blame] | 293 | static int tpd_probe_of(struct platform_device *pdev) |
| 294 | { |
| 295 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); |
| 296 | struct device_node *node = pdev->dev.of_node; |
| 297 | struct omap_dss_device *in; |
| 298 | int gpio; |
| 299 | |
| 300 | /* CT CP HPD GPIO */ |
| 301 | gpio = of_get_gpio(node, 0); |
| 302 | if (!gpio_is_valid(gpio)) { |
| 303 | dev_err(&pdev->dev, "failed to parse CT CP HPD gpio\n"); |
| 304 | return gpio; |
| 305 | } |
| 306 | ddata->ct_cp_hpd_gpio = gpio; |
| 307 | |
| 308 | /* LS OE GPIO */ |
| 309 | gpio = of_get_gpio(node, 1); |
| 310 | if (gpio_is_valid(gpio) || gpio == -ENOENT) { |
| 311 | ddata->ls_oe_gpio = gpio; |
| 312 | } else { |
| 313 | dev_err(&pdev->dev, "failed to parse LS OE gpio\n"); |
| 314 | return gpio; |
| 315 | } |
| 316 | |
| 317 | /* HPD GPIO */ |
| 318 | gpio = of_get_gpio(node, 2); |
| 319 | if (!gpio_is_valid(gpio)) { |
| 320 | dev_err(&pdev->dev, "failed to parse HPD gpio\n"); |
| 321 | return gpio; |
| 322 | } |
| 323 | ddata->hpd_gpio = gpio; |
| 324 | |
| 325 | in = omapdss_of_find_source_for_first_ep(node); |
| 326 | if (IS_ERR(in)) { |
| 327 | dev_err(&pdev->dev, "failed to find video source\n"); |
| 328 | return PTR_ERR(in); |
| 329 | } |
| 330 | |
| 331 | ddata->in = in; |
| 332 | |
| 333 | return 0; |
| 334 | } |
| 335 | |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 336 | static int tpd_probe(struct platform_device *pdev) |
| 337 | { |
| 338 | struct omap_dss_device *in, *dssdev; |
| 339 | struct panel_drv_data *ddata; |
| 340 | int r; |
| 341 | |
| 342 | ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); |
| 343 | if (!ddata) |
| 344 | return -ENOMEM; |
| 345 | |
| 346 | platform_set_drvdata(pdev, ddata); |
| 347 | |
| 348 | init_completion(&ddata->hpd_completion); |
| 349 | |
| 350 | if (dev_get_platdata(&pdev->dev)) { |
| 351 | r = tpd_probe_pdata(pdev); |
| 352 | if (r) |
| 353 | return r; |
Tomi Valkeinen | 5e4c89c | 2013-07-30 10:37:17 +0300 | [diff] [blame] | 354 | } else if (pdev->dev.of_node) { |
| 355 | r = tpd_probe_of(pdev); |
| 356 | if (r) |
| 357 | return r; |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 358 | } else { |
| 359 | return -ENODEV; |
| 360 | } |
| 361 | |
| 362 | r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio, |
| 363 | GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd"); |
| 364 | if (r) |
| 365 | goto err_gpio; |
| 366 | |
| 367 | if (gpio_is_valid(ddata->ls_oe_gpio)) { |
| 368 | r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio, |
| 369 | GPIOF_OUT_INIT_LOW, "hdmi_ls_oe"); |
| 370 | if (r) |
| 371 | goto err_gpio; |
| 372 | } |
| 373 | |
| 374 | r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio, |
| 375 | GPIOF_DIR_IN, "hdmi_hpd"); |
| 376 | if (r) |
| 377 | goto err_gpio; |
| 378 | |
| 379 | r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio), |
| 380 | NULL, tpd_hpd_irq_handler, |
| 381 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | |
| 382 | IRQF_ONESHOT, "hpd", ddata); |
| 383 | if (r) |
| 384 | goto err_irq; |
| 385 | |
| 386 | dssdev = &ddata->dssdev; |
| 387 | dssdev->ops.hdmi = &tpd_hdmi_ops; |
| 388 | dssdev->dev = &pdev->dev; |
| 389 | dssdev->type = OMAP_DISPLAY_TYPE_HDMI; |
| 390 | dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI; |
| 391 | dssdev->owner = THIS_MODULE; |
| 392 | |
| 393 | in = ddata->in; |
| 394 | |
| 395 | r = omapdss_register_output(dssdev); |
| 396 | if (r) { |
| 397 | dev_err(&pdev->dev, "Failed to register output\n"); |
| 398 | goto err_reg; |
| 399 | } |
| 400 | |
| 401 | return 0; |
| 402 | err_reg: |
| 403 | err_irq: |
| 404 | err_gpio: |
| 405 | omap_dss_put_device(ddata->in); |
| 406 | return r; |
| 407 | } |
| 408 | |
| 409 | static int __exit tpd_remove(struct platform_device *pdev) |
| 410 | { |
| 411 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); |
| 412 | struct omap_dss_device *dssdev = &ddata->dssdev; |
| 413 | struct omap_dss_device *in = ddata->in; |
| 414 | |
| 415 | omapdss_unregister_output(&ddata->dssdev); |
| 416 | |
| 417 | WARN_ON(omapdss_device_is_enabled(dssdev)); |
| 418 | if (omapdss_device_is_enabled(dssdev)) |
| 419 | tpd_disable(dssdev); |
| 420 | |
| 421 | WARN_ON(omapdss_device_is_connected(dssdev)); |
| 422 | if (omapdss_device_is_connected(dssdev)) |
Tomi Valkeinen | 9560dc10 | 2013-07-24 13:06:54 +0300 | [diff] [blame] | 423 | tpd_disconnect(dssdev, dssdev->dst); |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 424 | |
| 425 | omap_dss_put_device(in); |
| 426 | |
| 427 | return 0; |
| 428 | } |
| 429 | |
Tomi Valkeinen | 5e4c89c | 2013-07-30 10:37:17 +0300 | [diff] [blame] | 430 | static const struct of_device_id tpd_of_match[] = { |
| 431 | { .compatible = "omapdss,ti,tpd12s015", }, |
| 432 | {}, |
| 433 | }; |
| 434 | |
| 435 | MODULE_DEVICE_TABLE(of, tpd_of_match); |
| 436 | |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 437 | static struct platform_driver tpd_driver = { |
| 438 | .probe = tpd_probe, |
| 439 | .remove = __exit_p(tpd_remove), |
| 440 | .driver = { |
| 441 | .name = "tpd12s015", |
| 442 | .owner = THIS_MODULE, |
Tomi Valkeinen | 5e4c89c | 2013-07-30 10:37:17 +0300 | [diff] [blame] | 443 | .of_match_table = tpd_of_match, |
Tomi Valkeinen | a0ee577 | 2013-05-24 14:20:14 +0300 | [diff] [blame] | 444 | }, |
| 445 | }; |
| 446 | |
| 447 | module_platform_driver(tpd_driver); |
| 448 | |
| 449 | MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); |
| 450 | MODULE_DESCRIPTION("TPD12S015 driver"); |
| 451 | MODULE_LICENSE("GPL"); |