1 /* 2 * Copyright (C) 2005-2007 by Texas Instruments 3 * Some code has been taken from tusb6010.c 4 * Copyrights for that are attributable to: 5 * Copyright (C) 2006 Nokia Corporation 6 * Tony Lindgren <tony@atomide.com> 7 * 8 * This file is part of the Inventra Controller Driver for Linux. 9 * 10 * The Inventra Controller Driver for Linux is free software; you 11 * can redistribute it and/or modify it under the terms of the GNU 12 * General Public License version 2 as published by the Free Software 13 * Foundation. 14 * 15 * The Inventra Controller Driver for Linux is distributed in 16 * the hope that it will be useful, but WITHOUT ANY WARRANTY; 17 * without even the implied warranty of MERCHANTABILITY or 18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 19 * License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with The Inventra Controller Driver for Linux ; if not, 23 * write to the Free Software Foundation, Inc., 59 Temple Place, 24 * Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 #include <linux/module.h> 28 #include <linux/kernel.h> 29 #include <linux/sched.h> 30 #include <linux/init.h> 31 #include <linux/list.h> 32 #include <linux/io.h> 33 #include <linux/of.h> 34 #include <linux/platform_device.h> 35 #include <linux/dma-mapping.h> 36 #include <linux/pm_runtime.h> 37 #include <linux/err.h> 38 #include <linux/delay.h> 39 #include <linux/usb/musb-omap.h> 40 41 #include "musb_core.h" 42 #include "omap2430.h" 43 44 struct omap2430_glue { 45 struct device *dev; 46 struct platform_device *musb; 47 enum omap_musb_vbus_id_status status; 48 struct work_struct omap_musb_mailbox_work; 49 u32 __iomem *control_otghs; 50 }; 51 #define glue_to_musb(g) platform_get_drvdata(g->musb) 52 53 struct omap2430_glue *_glue; 54 55 static struct timer_list musb_idle_timer; 56 57 /** 58 * omap4_usb_phy_mailbox - write to usb otg mailbox 59 * @glue: struct omap2430_glue * 60 * @val: the value to be written to the mailbox 61 * 62 * On detection of a device (ID pin is grounded), this API should be called 63 * to set AVALID, VBUSVALID and ID pin is grounded. 64 * 65 * When OMAP is connected to a host (OMAP in device mode), this API 66 * is called to set AVALID, VBUSVALID and ID pin in high impedance. 67 * 68 * XXX: This function will be removed once we have a seperate driver for 69 * control module 70 */ 71 static void omap4_usb_phy_mailbox(struct omap2430_glue *glue, u32 val) 72 { 73 if (glue->control_otghs) 74 writel(val, glue->control_otghs); 75 } 76 77 static void musb_do_idle(unsigned long _musb) 78 { 79 struct musb *musb = (void *)_musb; 80 unsigned long flags; 81 u8 power; 82 u8 devctl; 83 84 spin_lock_irqsave(&musb->lock, flags); 85 86 switch (musb->xceiv->state) { 87 case OTG_STATE_A_WAIT_BCON: 88 89 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 90 if (devctl & MUSB_DEVCTL_BDEVICE) { 91 musb->xceiv->state = OTG_STATE_B_IDLE; 92 MUSB_DEV_MODE(musb); 93 } else { 94 musb->xceiv->state = OTG_STATE_A_IDLE; 95 MUSB_HST_MODE(musb); 96 } 97 break; 98 case OTG_STATE_A_SUSPEND: 99 /* finish RESUME signaling? */ 100 if (musb->port1_status & MUSB_PORT_STAT_RESUME) { 101 power = musb_readb(musb->mregs, MUSB_POWER); 102 power &= ~MUSB_POWER_RESUME; 103 dev_dbg(musb->controller, "root port resume stopped, power %02x\n", power); 104 musb_writeb(musb->mregs, MUSB_POWER, power); 105 musb->is_active = 1; 106 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND 107 | MUSB_PORT_STAT_RESUME); 108 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16; 109 usb_hcd_poll_rh_status(musb_to_hcd(musb)); 110 /* NOTE: it might really be A_WAIT_BCON ... */ 111 musb->xceiv->state = OTG_STATE_A_HOST; 112 } 113 break; 114 case OTG_STATE_A_HOST: 115 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 116 if (devctl & MUSB_DEVCTL_BDEVICE) 117 musb->xceiv->state = OTG_STATE_B_IDLE; 118 else 119 musb->xceiv->state = OTG_STATE_A_WAIT_BCON; 120 default: 121 break; 122 } 123 spin_unlock_irqrestore(&musb->lock, flags); 124 } 125 126 127 static void omap2430_musb_try_idle(struct musb *musb, unsigned long timeout) 128 { 129 unsigned long default_timeout = jiffies + msecs_to_jiffies(3); 130 static unsigned long last_timer; 131 132 if (timeout == 0) 133 timeout = default_timeout; 134 135 /* Never idle if active, or when VBUS timeout is not set as host */ 136 if (musb->is_active || ((musb->a_wait_bcon == 0) 137 && (musb->xceiv->state == OTG_STATE_A_WAIT_BCON))) { 138 dev_dbg(musb->controller, "%s active, deleting timer\n", 139 otg_state_string(musb->xceiv->state)); 140 del_timer(&musb_idle_timer); 141 last_timer = jiffies; 142 return; 143 } 144 145 if (time_after(last_timer, timeout)) { 146 if (!timer_pending(&musb_idle_timer)) 147 last_timer = timeout; 148 else { 149 dev_dbg(musb->controller, "Longer idle timer already pending, ignoring\n"); 150 return; 151 } 152 } 153 last_timer = timeout; 154 155 dev_dbg(musb->controller, "%s inactive, for idle timer for %lu ms\n", 156 otg_state_string(musb->xceiv->state), 157 (unsigned long)jiffies_to_msecs(timeout - jiffies)); 158 mod_timer(&musb_idle_timer, timeout); 159 } 160 161 static void omap2430_musb_set_vbus(struct musb *musb, int is_on) 162 { 163 struct usb_otg *otg = musb->xceiv->otg; 164 u8 devctl; 165 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 166 /* HDRC controls CPEN, but beware current surges during device 167 * connect. They can trigger transient overcurrent conditions 168 * that must be ignored. 169 */ 170 171 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 172 173 if (is_on) { 174 if (musb->xceiv->state == OTG_STATE_A_IDLE) { 175 int loops = 100; 176 /* start the session */ 177 devctl |= MUSB_DEVCTL_SESSION; 178 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 179 /* 180 * Wait for the musb to set as A device to enable the 181 * VBUS 182 */ 183 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) { 184 185 mdelay(5); 186 cpu_relax(); 187 188 if (time_after(jiffies, timeout) 189 || loops-- <= 0) { 190 dev_err(musb->controller, 191 "configured as A device timeout"); 192 break; 193 } 194 } 195 196 if (otg->set_vbus) 197 otg_set_vbus(otg, 1); 198 } else { 199 musb->is_active = 1; 200 otg->default_a = 1; 201 musb->xceiv->state = OTG_STATE_A_WAIT_VRISE; 202 devctl |= MUSB_DEVCTL_SESSION; 203 MUSB_HST_MODE(musb); 204 } 205 } else { 206 musb->is_active = 0; 207 208 /* NOTE: we're skipping A_WAIT_VFALL -> A_IDLE and 209 * jumping right to B_IDLE... 210 */ 211 212 otg->default_a = 0; 213 musb->xceiv->state = OTG_STATE_B_IDLE; 214 devctl &= ~MUSB_DEVCTL_SESSION; 215 216 MUSB_DEV_MODE(musb); 217 } 218 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 219 220 dev_dbg(musb->controller, "VBUS %s, devctl %02x " 221 /* otg %3x conf %08x prcm %08x */ "\n", 222 otg_state_string(musb->xceiv->state), 223 musb_readb(musb->mregs, MUSB_DEVCTL)); 224 } 225 226 static int omap2430_musb_set_mode(struct musb *musb, u8 musb_mode) 227 { 228 u8 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 229 230 devctl |= MUSB_DEVCTL_SESSION; 231 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 232 233 return 0; 234 } 235 236 static inline void omap2430_low_level_exit(struct musb *musb) 237 { 238 u32 l; 239 240 /* in any role */ 241 l = musb_readl(musb->mregs, OTG_FORCESTDBY); 242 l |= ENABLEFORCE; /* enable MSTANDBY */ 243 musb_writel(musb->mregs, OTG_FORCESTDBY, l); 244 } 245 246 static inline void omap2430_low_level_init(struct musb *musb) 247 { 248 u32 l; 249 250 l = musb_readl(musb->mregs, OTG_FORCESTDBY); 251 l &= ~ENABLEFORCE; /* disable MSTANDBY */ 252 musb_writel(musb->mregs, OTG_FORCESTDBY, l); 253 } 254 255 void omap_musb_mailbox(enum omap_musb_vbus_id_status status) 256 { 257 struct omap2430_glue *glue = _glue; 258 struct musb *musb = glue_to_musb(glue); 259 260 glue->status = status; 261 if (!musb) { 262 dev_err(glue->dev, "musb core is not yet ready\n"); 263 return; 264 } 265 266 schedule_work(&glue->omap_musb_mailbox_work); 267 } 268 EXPORT_SYMBOL_GPL(omap_musb_mailbox); 269 270 static void omap_musb_set_mailbox(struct omap2430_glue *glue) 271 { 272 u32 val; 273 struct musb *musb = glue_to_musb(glue); 274 struct device *dev = musb->controller; 275 struct musb_hdrc_platform_data *pdata = dev->platform_data; 276 struct omap_musb_board_data *data = pdata->board_data; 277 struct usb_otg *otg = musb->xceiv->otg; 278 279 switch (glue->status) { 280 case OMAP_MUSB_ID_GROUND: 281 dev_dbg(dev, "ID GND\n"); 282 283 otg->default_a = true; 284 musb->xceiv->state = OTG_STATE_A_IDLE; 285 musb->xceiv->last_event = USB_EVENT_ID; 286 if (musb->gadget_driver) { 287 pm_runtime_get_sync(dev); 288 val = AVALID | VBUSVALID; 289 omap4_usb_phy_mailbox(glue, val); 290 omap2430_musb_set_vbus(musb, 1); 291 } 292 break; 293 294 case OMAP_MUSB_VBUS_VALID: 295 dev_dbg(dev, "VBUS Connect\n"); 296 297 otg->default_a = false; 298 musb->xceiv->state = OTG_STATE_B_IDLE; 299 musb->xceiv->last_event = USB_EVENT_VBUS; 300 if (musb->gadget_driver) 301 pm_runtime_get_sync(dev); 302 val = IDDIG | AVALID | VBUSVALID; 303 omap4_usb_phy_mailbox(glue, val); 304 break; 305 306 case OMAP_MUSB_ID_FLOAT: 307 case OMAP_MUSB_VBUS_OFF: 308 dev_dbg(dev, "VBUS Disconnect\n"); 309 310 musb->xceiv->last_event = USB_EVENT_NONE; 311 if (musb->gadget_driver) { 312 pm_runtime_mark_last_busy(dev); 313 pm_runtime_put_autosuspend(dev); 314 } 315 316 if (data->interface_type == MUSB_INTERFACE_UTMI) { 317 if (musb->xceiv->otg->set_vbus) 318 otg_set_vbus(musb->xceiv->otg, 0); 319 } 320 val = SESSEND | IDDIG; 321 omap4_usb_phy_mailbox(glue, val); 322 break; 323 default: 324 dev_dbg(dev, "ID float\n"); 325 } 326 } 327 328 329 static void omap_musb_mailbox_work(struct work_struct *mailbox_work) 330 { 331 struct omap2430_glue *glue = container_of(mailbox_work, 332 struct omap2430_glue, omap_musb_mailbox_work); 333 omap_musb_set_mailbox(glue); 334 } 335 336 static int omap2430_musb_init(struct musb *musb) 337 { 338 u32 l; 339 int status = 0; 340 struct device *dev = musb->controller; 341 struct omap2430_glue *glue = dev_get_drvdata(dev->parent); 342 struct musb_hdrc_platform_data *plat = dev->platform_data; 343 struct omap_musb_board_data *data = plat->board_data; 344 345 /* We require some kind of external transceiver, hooked 346 * up through ULPI. TWL4030-family PMICs include one, 347 * which needs a driver, drivers aren't always needed. 348 */ 349 musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 350 if (IS_ERR_OR_NULL(musb->xceiv)) { 351 pr_err("HS USB OTG: no transceiver configured\n"); 352 return -ENODEV; 353 } 354 355 status = pm_runtime_get_sync(dev); 356 if (status < 0) { 357 dev_err(dev, "pm_runtime_get_sync FAILED %d\n", status); 358 goto err1; 359 } 360 361 l = musb_readl(musb->mregs, OTG_INTERFSEL); 362 363 if (data->interface_type == MUSB_INTERFACE_UTMI) { 364 /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */ 365 l &= ~ULPI_12PIN; /* Disable ULPI */ 366 l |= UTMI_8BIT; /* Enable UTMI */ 367 } else { 368 l |= ULPI_12PIN; 369 } 370 371 musb_writel(musb->mregs, OTG_INTERFSEL, l); 372 373 pr_debug("HS USB OTG: revision 0x%x, sysconfig 0x%02x, " 374 "sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n", 375 musb_readl(musb->mregs, OTG_REVISION), 376 musb_readl(musb->mregs, OTG_SYSCONFIG), 377 musb_readl(musb->mregs, OTG_SYSSTATUS), 378 musb_readl(musb->mregs, OTG_INTERFSEL), 379 musb_readl(musb->mregs, OTG_SIMENABLE)); 380 381 setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb); 382 383 if (glue->status != OMAP_MUSB_UNKNOWN) 384 omap_musb_set_mailbox(glue); 385 386 pm_runtime_put_noidle(musb->controller); 387 return 0; 388 389 err1: 390 return status; 391 } 392 393 static void omap2430_musb_enable(struct musb *musb) 394 { 395 u8 devctl; 396 u32 val; 397 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 398 struct device *dev = musb->controller; 399 struct omap2430_glue *glue = dev_get_drvdata(dev->parent); 400 struct musb_hdrc_platform_data *pdata = dev->platform_data; 401 struct omap_musb_board_data *data = pdata->board_data; 402 403 switch (glue->status) { 404 405 case OMAP_MUSB_ID_GROUND: 406 val = AVALID | VBUSVALID; 407 omap4_usb_phy_mailbox(glue, val); 408 if (data->interface_type != MUSB_INTERFACE_UTMI) 409 break; 410 devctl = musb_readb(musb->mregs, MUSB_DEVCTL); 411 /* start the session */ 412 devctl |= MUSB_DEVCTL_SESSION; 413 musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); 414 while (musb_readb(musb->mregs, MUSB_DEVCTL) & 415 MUSB_DEVCTL_BDEVICE) { 416 cpu_relax(); 417 418 if (time_after(jiffies, timeout)) { 419 dev_err(dev, "configured as A device timeout"); 420 break; 421 } 422 } 423 break; 424 425 case OMAP_MUSB_VBUS_VALID: 426 val = IDDIG | AVALID | VBUSVALID; 427 omap4_usb_phy_mailbox(glue, val); 428 break; 429 430 default: 431 break; 432 } 433 } 434 435 static void omap2430_musb_disable(struct musb *musb) 436 { 437 u32 val; 438 struct device *dev = musb->controller; 439 struct omap2430_glue *glue = dev_get_drvdata(dev->parent); 440 441 if (glue->status != OMAP_MUSB_UNKNOWN) { 442 val = SESSEND | IDDIG; 443 omap4_usb_phy_mailbox(glue, val); 444 } 445 } 446 447 static int omap2430_musb_exit(struct musb *musb) 448 { 449 del_timer_sync(&musb_idle_timer); 450 451 omap2430_low_level_exit(musb); 452 453 return 0; 454 } 455 456 static const struct musb_platform_ops omap2430_ops = { 457 .init = omap2430_musb_init, 458 .exit = omap2430_musb_exit, 459 460 .set_mode = omap2430_musb_set_mode, 461 .try_idle = omap2430_musb_try_idle, 462 463 .set_vbus = omap2430_musb_set_vbus, 464 465 .enable = omap2430_musb_enable, 466 .disable = omap2430_musb_disable, 467 }; 468 469 static u64 omap2430_dmamask = DMA_BIT_MASK(32); 470 471 static int __devinit omap2430_probe(struct platform_device *pdev) 472 { 473 struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; 474 struct omap_musb_board_data *data; 475 struct platform_device *musb; 476 struct omap2430_glue *glue; 477 struct device_node *np = pdev->dev.of_node; 478 struct musb_hdrc_config *config; 479 struct resource *res; 480 int ret = -ENOMEM; 481 int musbid; 482 483 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 484 if (!glue) { 485 dev_err(&pdev->dev, "failed to allocate glue context\n"); 486 goto err0; 487 } 488 489 /* get the musb id */ 490 musbid = musb_get_id(&pdev->dev, GFP_KERNEL); 491 if (musbid < 0) { 492 dev_err(&pdev->dev, "failed to allocate musb id\n"); 493 ret = -ENOMEM; 494 goto err0; 495 } 496 497 musb = platform_device_alloc("musb-hdrc", musbid); 498 if (!musb) { 499 dev_err(&pdev->dev, "failed to allocate musb device\n"); 500 goto err1; 501 } 502 503 musb->id = musbid; 504 musb->dev.parent = &pdev->dev; 505 musb->dev.dma_mask = &omap2430_dmamask; 506 musb->dev.coherent_dma_mask = omap2430_dmamask; 507 508 glue->dev = &pdev->dev; 509 glue->musb = musb; 510 glue->status = OMAP_MUSB_UNKNOWN; 511 512 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 513 514 glue->control_otghs = devm_request_and_ioremap(&pdev->dev, res); 515 if (glue->control_otghs == NULL) 516 dev_dbg(&pdev->dev, "Failed to obtain control memory\n"); 517 518 if (np) { 519 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 520 if (!pdata) { 521 dev_err(&pdev->dev, 522 "failed to allocate musb platfrom data\n"); 523 ret = -ENOMEM; 524 goto err1; 525 } 526 527 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 528 if (!data) { 529 dev_err(&pdev->dev, 530 "failed to allocate musb board data\n"); 531 ret = -ENOMEM; 532 goto err1; 533 } 534 535 config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL); 536 if (!data) { 537 dev_err(&pdev->dev, 538 "failed to allocate musb hdrc config\n"); 539 goto err1; 540 } 541 542 of_property_read_u32(np, "mode", (u32 *)&pdata->mode); 543 of_property_read_u32(np, "interface_type", 544 (u32 *)&data->interface_type); 545 of_property_read_u32(np, "num_eps", (u32 *)&config->num_eps); 546 of_property_read_u32(np, "ram_bits", (u32 *)&config->ram_bits); 547 of_property_read_u32(np, "power", (u32 *)&pdata->power); 548 config->multipoint = of_property_read_bool(np, "multipoint"); 549 550 pdata->board_data = data; 551 pdata->config = config; 552 } 553 554 pdata->platform_ops = &omap2430_ops; 555 556 platform_set_drvdata(pdev, glue); 557 558 /* 559 * REVISIT if we ever have two instances of the wrapper, we will be 560 * in big trouble 561 */ 562 _glue = glue; 563 564 INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work); 565 566 ret = platform_device_add_resources(musb, pdev->resource, 567 pdev->num_resources); 568 if (ret) { 569 dev_err(&pdev->dev, "failed to add resources\n"); 570 goto err2; 571 } 572 573 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 574 if (ret) { 575 dev_err(&pdev->dev, "failed to add platform_data\n"); 576 goto err2; 577 } 578 579 pm_runtime_enable(&pdev->dev); 580 581 ret = platform_device_add(musb); 582 if (ret) { 583 dev_err(&pdev->dev, "failed to register musb device\n"); 584 goto err2; 585 } 586 587 return 0; 588 589 err2: 590 platform_device_put(musb); 591 592 err1: 593 musb_put_id(&pdev->dev, musbid); 594 595 err0: 596 return ret; 597 } 598 599 static int __devexit omap2430_remove(struct platform_device *pdev) 600 { 601 struct omap2430_glue *glue = platform_get_drvdata(pdev); 602 603 cancel_work_sync(&glue->omap_musb_mailbox_work); 604 musb_put_id(&pdev->dev, glue->musb->id); 605 platform_device_unregister(glue->musb); 606 607 return 0; 608 } 609 610 #ifdef CONFIG_PM 611 612 static int omap2430_runtime_suspend(struct device *dev) 613 { 614 struct omap2430_glue *glue = dev_get_drvdata(dev); 615 struct musb *musb = glue_to_musb(glue); 616 617 if (musb) { 618 musb->context.otg_interfsel = musb_readl(musb->mregs, 619 OTG_INTERFSEL); 620 621 omap2430_low_level_exit(musb); 622 usb_phy_set_suspend(musb->xceiv, 1); 623 } 624 625 return 0; 626 } 627 628 static int omap2430_runtime_resume(struct device *dev) 629 { 630 struct omap2430_glue *glue = dev_get_drvdata(dev); 631 struct musb *musb = glue_to_musb(glue); 632 633 if (musb) { 634 omap2430_low_level_init(musb); 635 musb_writel(musb->mregs, OTG_INTERFSEL, 636 musb->context.otg_interfsel); 637 638 usb_phy_set_suspend(musb->xceiv, 0); 639 } 640 641 return 0; 642 } 643 644 static struct dev_pm_ops omap2430_pm_ops = { 645 .runtime_suspend = omap2430_runtime_suspend, 646 .runtime_resume = omap2430_runtime_resume, 647 }; 648 649 #define DEV_PM_OPS (&omap2430_pm_ops) 650 #else 651 #define DEV_PM_OPS NULL 652 #endif 653 654 #ifdef CONFIG_OF 655 static const struct of_device_id omap2430_id_table[] = { 656 { 657 .compatible = "ti,omap4-musb" 658 }, 659 { 660 .compatible = "ti,omap3-musb" 661 }, 662 {}, 663 }; 664 MODULE_DEVICE_TABLE(of, omap2430_id_table); 665 #endif 666 667 static struct platform_driver omap2430_driver = { 668 .probe = omap2430_probe, 669 .remove = __devexit_p(omap2430_remove), 670 .driver = { 671 .name = "musb-omap2430", 672 .pm = DEV_PM_OPS, 673 .of_match_table = of_match_ptr(omap2430_id_table), 674 }, 675 }; 676 677 MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer"); 678 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 679 MODULE_LICENSE("GPL v2"); 680 681 static int __init omap2430_init(void) 682 { 683 return platform_driver_register(&omap2430_driver); 684 } 685 subsys_initcall(omap2430_init); 686 687 static void __exit omap2430_exit(void) 688 { 689 platform_driver_unregister(&omap2430_driver); 690 } 691 module_exit(omap2430_exit); 692