X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=blobdiff_plain;f=drivers%2Fcbus%2Ftahvo-usb.c;fp=drivers%2Fcbus%2Ftahvo-usb.c;h=d8ad836d50153cb8c686ccdd81b66c03ff16e61a;hp=0000000000000000000000000000000000000000;hb=14fc69723d3442ef46f8f82b3f481e82f06a346d;hpb=c7d41fe1898f2fd6d9b9f98c7932fc5d6ca6bf3e diff --git a/drivers/cbus/tahvo-usb.c b/drivers/cbus/tahvo-usb.c new file mode 100644 index 00000000000..d8ad836d501 --- /dev/null +++ b/drivers/cbus/tahvo-usb.c @@ -0,0 +1,777 @@ +/** + * drivers/cbus/tahvo-usb.c + * + * Tahvo USB transeiver + * + * Copyright (C) 2005-2006 Nokia Corporation + * + * Parts copied from drivers/i2c/chips/isp1301_omap.c + * Copyright (C) 2004 Texas Instruments + * Copyright (C) 2004 David Brownell + * + * Written by Juha Yrjölä , + * Tony Lindgren , and + * Timo Teräs + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file "COPYING" in the main directory of this + * archive for more details. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "cbus.h" +#include "tahvo.h" + +#define DRIVER_NAME "tahvo-usb" + +#define USBR_SLAVE_CONTROL (1 << 8) +#define USBR_VPPVIO_SW (1 << 7) +#define USBR_SPEED (1 << 6) +#define USBR_REGOUT (1 << 5) +#define USBR_MASTER_SW2 (1 << 4) +#define USBR_MASTER_SW1 (1 << 3) +#define USBR_SLAVE_SW (1 << 2) +#define USBR_NSUSPEND (1 << 1) +#define USBR_SEMODE (1 << 0) + +/* bits in OTG_CTRL */ + +/* Bits that are controlled by OMAP OTG and are read-only */ +#define OTG_CTRL_OMAP_MASK (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|\ + OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID) +/* Bits that are controlled by transceiver */ +#define OTG_CTRL_XCVR_MASK (OTG_ASESSVLD|OTG_BSESSEND|\ + OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID) +/* Bits that are controlled by system */ +#define OTG_CTRL_SYS_MASK (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|\ + OTG_B_HNPEN|OTG_BUSDROP) + +#if defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OTG) +#error tahvo-otg.c does not work with OCHI yet! +#endif + +#define TAHVO_MODE_HOST 0 +#define TAHVO_MODE_PERIPHERAL 1 + +#ifdef CONFIG_USB_OTG +#define TAHVO_MODE(tu) (tu)->tahvo_mode +#elif defined(CONFIG_USB_GADGET_OMAP) +#define TAHVO_MODE(tu) TAHVO_MODE_PERIPHERAL +#else +#define TAHVO_MODE(tu) TAHVO_MODE_HOST +#endif + +struct tahvo_usb { + struct platform_device *pt_dev; + struct otg_transceiver otg; + int vbus_state; + struct work_struct irq_work; + struct mutex serialize; +#ifdef CONFIG_USB_OTG + int tahvo_mode; +#endif +}; +static struct platform_device tahvo_usb_device; + +/* + * --------------------------------------------------------------------------- + * OTG related functions + * + * These shoud be separated into omap-otg.c driver module, as they are used + * by various transceivers. These functions are needed in the UDC-only case + * as well. These functions are copied from GPL isp1301_omap.c + * --------------------------------------------------------------------------- + */ +static struct platform_device *tahvo_otg_dev; + +static irqreturn_t omap_otg_irq(int irq, void *arg) +{ + struct platform_device *otg_dev = (struct platform_device *) arg; + struct tahvo_usb *tu = (struct tahvo_usb *) otg_dev->dev.driver_data; + u16 otg_irq; + + otg_irq = omap_readw(OTG_IRQ_SRC); + if (otg_irq & OPRT_CHG) { + omap_writew(OPRT_CHG, OTG_IRQ_SRC); + } else if (otg_irq & B_SRP_TMROUT) { + omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC); + } else if (otg_irq & B_HNP_FAIL) { + omap_writew(B_HNP_FAIL, OTG_IRQ_SRC); + } else if (otg_irq & A_SRP_DETECT) { + omap_writew(A_SRP_DETECT, OTG_IRQ_SRC); + } else if (otg_irq & A_REQ_TMROUT) { + omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC); + } else if (otg_irq & A_VBUS_ERR) { + omap_writew(A_VBUS_ERR, OTG_IRQ_SRC); + } else if (otg_irq & DRIVER_SWITCH) { + if ((!(omap_readl(OTG_CTRL) & OTG_DRIVER_SEL)) && + tu->otg.host && tu->otg.state == OTG_STATE_A_HOST) { + /* role is host */ + usb_bus_start_enum(tu->otg.host, + tu->otg.host->otg_port); + } + omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC); + } else + return IRQ_NONE; + + return IRQ_HANDLED; + +} + +static int omap_otg_init(void) +{ + u32 l; + +#ifdef CONFIG_USB_OTG + if (!tahvo_otg_dev) { + printk("tahvo-usb: no tahvo_otg_dev\n"); + return -ENODEV; + } +#endif + + l = omap_readl(OTG_SYSCON_1); + l &= ~OTG_IDLE_EN; + omap_writel(l, OTG_SYSCON_1); + udelay(100); + + /* some of these values are board-specific... */ + l = omap_readl(OTG_SYSCON_2); + l |= OTG_EN + /* for B-device: */ + | SRP_GPDATA /* 9msec Bdev D+ pulse */ + | SRP_GPDVBUS /* discharge after VBUS pulse */ + // | (3 << 24) /* 2msec VBUS pulse */ + /* for A-device: */ + | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */ + | SRP_DPW /* detect 167+ns SRP pulses */ + | SRP_DATA | SRP_VBUS; /* accept both kinds of SRP pulse */ + omap_writel(l, OTG_SYSCON_2); + + omap_writew(DRIVER_SWITCH | OPRT_CHG + | B_SRP_TMROUT | B_HNP_FAIL + | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, + OTG_IRQ_EN); + l = omap_readl(OTG_SYSCON_2); + l |= OTG_EN; + omap_writel(l, OTG_SYSCON_2); + + return 0; +} + +static int omap_otg_probe(struct device *dev) +{ + int ret; + + tahvo_otg_dev = to_platform_device(dev); + ret = omap_otg_init(); + if (ret != 0) { + printk(KERN_ERR "tahvo-usb: omap_otg_init failed\n"); + return ret; + } + + return request_irq(tahvo_otg_dev->resource[1].start, + omap_otg_irq, IRQF_DISABLED, DRIVER_NAME, + &tahvo_usb_device); +} + +static int omap_otg_remove(struct device *dev) +{ + free_irq(tahvo_otg_dev->resource[1].start, &tahvo_usb_device); + tahvo_otg_dev = NULL; + + return 0; +} + +struct device_driver omap_otg_driver = { + .name = "omap_otg", + .bus = &platform_bus_type, + .probe = omap_otg_probe, + .remove = omap_otg_remove, +}; + +/* + * --------------------------------------------------------------------------- + * Tahvo related functions + * These are Nokia proprietary code, except for the OTG register settings, + * which are copied from isp1301.c + * --------------------------------------------------------------------------- + */ +static ssize_t vbus_state_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct tahvo_usb *tu = (struct tahvo_usb*) device->driver_data; + return sprintf(buf, "%d\n", tu->vbus_state); +} +static DEVICE_ATTR(vbus_state, 0444, vbus_state_show, NULL); + +int vbus_active = 0; + +#if 0 + +static int host_suspend(struct tahvo_usb *tu) +{ + struct device *dev; + + if (!tu->otg.host) + return -ENODEV; + + /* Currently ASSUMES only the OTG port matters; + * other ports could be active... + */ + dev = tu->otg.host->controller; + return dev->driver->suspend(dev, PMSG_SUSPEND); +} + +static int host_resume(struct tahvo_usb *tu) +{ + struct device *dev; + + if (!tu->otg.host) + return -ENODEV; + + dev = tu->otg.host->controller; + return dev->driver->resume(dev); +} + +#else + +static int host_suspend(struct tahvo_usb *tu) +{ + return 0; +} + +static int host_resume(struct tahvo_usb *tu) +{ + return 0; +} + +#endif + +static void check_vbus_state(struct tahvo_usb *tu) +{ + int reg, prev_state; + + reg = tahvo_read_reg(TAHVO_REG_IDSR); + if (reg & 0x01) { + u32 l; + + vbus_active = 1; + switch (tu->otg.state) { + case OTG_STATE_B_IDLE: + /* Enable the gadget driver */ + if (tu->otg.gadget) + usb_gadget_vbus_connect(tu->otg.gadget); + /* Set B-session valid and not B-sessio ended to indicate + * Vbus to be ok. */ + l = omap_readl(OTG_CTRL); + l &= ~OTG_BSESSEND; + l |= OTG_BSESSVLD; + omap_writel(l, OTG_CTRL); + + tu->otg.state = OTG_STATE_B_PERIPHERAL; + break; + case OTG_STATE_A_IDLE: + /* Session is now valid assuming the USB hub is driving Vbus */ + tu->otg.state = OTG_STATE_A_HOST; + host_resume(tu); + break; + default: + break; + } + printk("USB cable connected\n"); + } else { + switch (tu->otg.state) { + case OTG_STATE_B_PERIPHERAL: + if (tu->otg.gadget) + usb_gadget_vbus_disconnect(tu->otg.gadget); + tu->otg.state = OTG_STATE_B_IDLE; + break; + case OTG_STATE_A_HOST: + tu->otg.state = OTG_STATE_A_IDLE; + break; + default: + break; + } + printk("USB cable disconnected\n"); + vbus_active = 0; + } + + prev_state = tu->vbus_state; + tu->vbus_state = reg & 0x01; + if (prev_state != tu->vbus_state) + sysfs_notify(&tu->pt_dev->dev.kobj, NULL, "vbus_state"); +} + +static void tahvo_usb_become_host(struct tahvo_usb *tu) +{ + u32 l; + + /* Clear system and transceiver controlled bits + * also mark the A-session is always valid */ + omap_otg_init(); + + l = omap_readl(OTG_CTRL); + l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK); + l |= OTG_ASESSVLD; + omap_writel(l, OTG_CTRL); + + /* Power up the transceiver in USB host mode */ + tahvo_write_reg(TAHVO_REG_USBR, USBR_REGOUT | USBR_NSUSPEND | + USBR_MASTER_SW2 | USBR_MASTER_SW1); + tu->otg.state = OTG_STATE_A_IDLE; + + check_vbus_state(tu); +} + +static void tahvo_usb_stop_host(struct tahvo_usb *tu) +{ + host_suspend(tu); + tu->otg.state = OTG_STATE_A_IDLE; +} + +static void tahvo_usb_become_peripheral(struct tahvo_usb *tu) +{ + u32 l; + + /* Clear system and transceiver controlled bits + * and enable ID to mark peripheral mode and + * BSESSEND to mark no Vbus */ + omap_otg_init(); + l = omap_readl(OTG_CTRL); + l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK | OTG_BSESSVLD); + l |= OTG_ID | OTG_BSESSEND; + omap_writel(l, OTG_CTRL); + + /* Power up transceiver and set it in USB perhiperal mode */ + tahvo_write_reg(TAHVO_REG_USBR, USBR_SLAVE_CONTROL | USBR_REGOUT | USBR_NSUSPEND | USBR_SLAVE_SW); + tu->otg.state = OTG_STATE_B_IDLE; + + check_vbus_state(tu); +} + +static void tahvo_usb_stop_peripheral(struct tahvo_usb *tu) +{ + u32 l; + + l = omap_readl(OTG_CTRL); + l &= ~OTG_BSESSVLD; + l |= OTG_BSESSEND; + omap_writel(l, OTG_CTRL); + + if (tu->otg.gadget) + usb_gadget_vbus_disconnect(tu->otg.gadget); + tu->otg.state = OTG_STATE_B_IDLE; + +} + +static void tahvo_usb_power_off(struct tahvo_usb *tu) +{ + u32 l; + int id; + + /* Disable gadget controller if any */ + if (tu->otg.gadget) + usb_gadget_vbus_disconnect(tu->otg.gadget); + + host_suspend(tu); + + /* Disable OTG and interrupts */ + if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL) + id = OTG_ID; + else + id = 0; + l = omap_readl(OTG_CTRL); + l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK | OTG_BSESSVLD); + l |= id | OTG_BSESSEND; + omap_writel(l, OTG_CTRL); + omap_writew(0, OTG_IRQ_EN); + + l = omap_readl(OTG_SYSCON_2); + l &= ~OTG_EN; + omap_writel(l, OTG_SYSCON_2); + + l = omap_readl(OTG_SYSCON_1); + l |= OTG_IDLE_EN; + omap_writel(l, OTG_SYSCON_1); + + /* Power off transceiver */ + tahvo_write_reg(TAHVO_REG_USBR, 0); + tu->otg.state = OTG_STATE_UNDEFINED; +} + + +static int tahvo_usb_set_power(struct otg_transceiver *dev, unsigned mA) +{ + struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg); + + dev_dbg(&tu->pt_dev->dev, "set_power %d mA\n", mA); + + if (dev->state == OTG_STATE_B_PERIPHERAL) { + /* REVISIT: Can Tahvo charge battery from VBUS? */ + } + return 0; +} + +static int tahvo_usb_set_suspend(struct otg_transceiver *dev, int suspend) +{ + struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg); + u16 w; + + dev_dbg(&tu->pt_dev->dev, "set_suspend\n"); + + w = tahvo_read_reg(TAHVO_REG_USBR); + if (suspend) + w &= ~USBR_NSUSPEND; + else + w |= USBR_NSUSPEND; + tahvo_write_reg(TAHVO_REG_USBR, w); + + return 0; +} + +static int tahvo_usb_start_srp(struct otg_transceiver *dev) +{ + struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg); + u32 otg_ctrl; + + dev_dbg(&tu->pt_dev->dev, "start_srp\n"); + + if (!dev || tu->otg.state != OTG_STATE_B_IDLE) + return -ENODEV; + + otg_ctrl = omap_readl(OTG_CTRL); + if (!(otg_ctrl & OTG_BSESSEND)) + return -EINVAL; + + otg_ctrl |= OTG_B_BUSREQ; + otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_SYS_MASK; + omap_writel(otg_ctrl, OTG_CTRL); + tu->otg.state = OTG_STATE_B_SRP_INIT; + + return 0; +} + +static int tahvo_usb_start_hnp(struct otg_transceiver *otg) +{ + struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg); + + dev_dbg(&tu->pt_dev->dev, "start_hnp\n"); +#ifdef CONFIG_USB_OTG + /* REVISIT: Add this for OTG */ +#endif + return -EINVAL; +} + +static int tahvo_usb_set_host(struct otg_transceiver *otg, struct usb_bus *host) +{ + struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg); + u32 l; + + dev_dbg(&tu->pt_dev->dev, "set_host %p\n", host); + + if (otg == NULL) + return -ENODEV; + +#if defined(CONFIG_USB_OTG) || !defined(CONFIG_USB_GADGET_OMAP) + + mutex_lock(&tu->serialize); + + if (host == NULL) { + if (TAHVO_MODE(tu) == TAHVO_MODE_HOST) + tahvo_usb_power_off(tu); + tu->otg.host = NULL; + mutex_unlock(&tu->serialize); + return 0; + } + + l = omap_readl(OTG_SYSCON_1); + l &= ~(OTG_IDLE_EN | HST_IDLE_EN | DEV_IDLE_EN); + omap_writel(l, OTG_SYSCON_1); + + if (TAHVO_MODE(tu) == TAHVO_MODE_HOST) { + tu->otg.host = NULL; + tahvo_usb_become_host(tu); + } else + host_suspend(tu); + + tu->otg.host = host; + + mutex_unlock(&tu->serialize); +#else + /* No host mode configured, so do not allow host controlled to be set */ + return -EINVAL; +#endif + + return 0; +} + +static int tahvo_usb_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget) +{ + struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg); + + dev_dbg(&tu->pt_dev->dev, "set_peripheral %p\n", gadget); + + if (!otg) + return -ENODEV; + +#if defined(CONFIG_USB_OTG) || defined(CONFIG_USB_GADGET_OMAP) + + mutex_lock(&tu->serialize); + + if (!gadget) { + if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL) + tahvo_usb_power_off(tu); + tu->otg.gadget = NULL; + mutex_unlock(&tu->serialize); + return 0; + } + + tu->otg.gadget = gadget; + if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL) + tahvo_usb_become_peripheral(tu); + + mutex_unlock(&tu->serialize); +#else + /* No gadget mode configured, so do not allow host controlled to be set */ + return -EINVAL; +#endif + + return 0; +} + +static void tahvo_usb_irq_work(struct work_struct *work) +{ + struct tahvo_usb *tu = container_of(work, struct tahvo_usb, irq_work); + + mutex_lock(&tu->serialize); + check_vbus_state(tu); + mutex_unlock(&tu->serialize); +} + +static void tahvo_usb_vbus_interrupt(unsigned long arg) +{ + struct tahvo_usb *tu = (struct tahvo_usb *) arg; + + tahvo_ack_irq(TAHVO_INT_VBUSON); + /* Seems we need this to acknowledge the interrupt */ + tahvo_read_reg(TAHVO_REG_IDSR); + schedule_work(&tu->irq_work); +} + +#ifdef CONFIG_USB_OTG +static ssize_t otg_mode_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct tahvo_usb *tu = (struct tahvo_usb*) device->driver_data; + switch (tu->tahvo_mode) { + case TAHVO_MODE_HOST: + return sprintf(buf, "host\n"); + case TAHVO_MODE_PERIPHERAL: + return sprintf(buf, "peripheral\n"); + } + return sprintf(buf, "unknown\n"); +} + +static ssize_t otg_mode_store(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tahvo_usb *tu = (struct tahvo_usb*) device->driver_data; + int r; + + r = strlen(buf); + mutex_lock(&tu->serialize); + if (strncmp(buf, "host", 4) == 0) { + if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL) + tahvo_usb_stop_peripheral(tu); + tu->tahvo_mode = TAHVO_MODE_HOST; + if (tu->otg.host) { + printk(KERN_INFO "Selected HOST mode: host controller present.\n"); + tahvo_usb_become_host(tu); + } else { + printk(KERN_INFO "Selected HOST mode: no host controller, powering off.\n"); + tahvo_usb_power_off(tu); + } + } else if (strncmp(buf, "peripheral", 10) == 0) { + if (tu->tahvo_mode == TAHVO_MODE_HOST) + tahvo_usb_stop_host(tu); + tu->tahvo_mode = TAHVO_MODE_PERIPHERAL; + if (tu->otg.gadget) { + printk(KERN_INFO "Selected PERIPHERAL mode: gadget driver present.\n"); + tahvo_usb_become_peripheral(tu); + } else { + printk(KERN_INFO "Selected PERIPHERAL mode: no gadget driver, powering off.\n"); + tahvo_usb_power_off(tu); + } + } else + r = -EINVAL; + + mutex_unlock(&tu->serialize); + return r; +} + +static DEVICE_ATTR(otg_mode, 0644, otg_mode_show, otg_mode_store); +#endif + +static int tahvo_usb_probe(struct device *dev) +{ + struct tahvo_usb *tu; + int ret; + + dev_dbg(dev, "probe\n"); + + /* Create driver data */ + tu = kmalloc(sizeof(*tu), GFP_KERNEL); + if (!tu) + return -ENOMEM; + memset(tu, 0, sizeof(*tu)); + tu->pt_dev = container_of(dev, struct platform_device, dev); +#ifdef CONFIG_USB_OTG + /* Default mode */ +#ifdef CONFIG_CBUS_TAHVO_USB_HOST_BY_DEFAULT + tu->tahvo_mode = TAHVO_MODE_HOST; +#else + tu->tahvo_mode = TAHVO_MODE_PERIPHERAL; +#endif +#endif + + INIT_WORK(&tu->irq_work, tahvo_usb_irq_work); + mutex_init(&tu->serialize); + + /* Set initial state, so that we generate kevents only on + * state changes */ + tu->vbus_state = tahvo_read_reg(TAHVO_REG_IDSR) & 0x01; + + /* We cannot enable interrupt until omap_udc is initialized */ + ret = tahvo_request_irq(TAHVO_INT_VBUSON, tahvo_usb_vbus_interrupt, + (unsigned long) tu, "vbus_interrupt"); + if (ret != 0) { + kfree(tu); + printk(KERN_ERR "Could not register Tahvo interrupt for VBUS\n"); + return ret; + } + + /* Attributes */ + ret = device_create_file(dev, &dev_attr_vbus_state); +#ifdef CONFIG_USB_OTG + ret |= device_create_file(dev, &dev_attr_otg_mode); +#endif + if (ret) + printk(KERN_ERR "attribute creation failed: %d\n", ret); + + /* Create OTG interface */ + tahvo_usb_power_off(tu); + tu->otg.state = OTG_STATE_UNDEFINED; + tu->otg.label = DRIVER_NAME; + tu->otg.set_host = tahvo_usb_set_host; + tu->otg.set_peripheral = tahvo_usb_set_peripheral; + tu->otg.set_power = tahvo_usb_set_power; + tu->otg.set_suspend = tahvo_usb_set_suspend; + tu->otg.start_srp = tahvo_usb_start_srp; + tu->otg.start_hnp = tahvo_usb_start_hnp; + + ret = otg_set_transceiver(&tu->otg); + if (ret < 0) { + printk(KERN_ERR "Cannot register USB transceiver\n"); + kfree(tu); + tahvo_free_irq(TAHVO_INT_VBUSON); + return ret; + } + + dev->driver_data = tu; + + /* Act upon current vbus state once at startup. A vbus state irq may or + * may not be generated in addition to this. */ + schedule_work(&tu->irq_work); + return 0; +} + +static int tahvo_usb_remove(struct device *dev) +{ + dev_dbg(dev, "remove\n"); + + tahvo_free_irq(TAHVO_INT_VBUSON); + flush_scheduled_work(); + otg_set_transceiver(0); + device_remove_file(dev, &dev_attr_vbus_state); +#ifdef CONFIG_USB_OTG + device_remove_file(dev, &dev_attr_otg_mode); +#endif + return 0; +} + +static struct device_driver tahvo_usb_driver = { + .name = "tahvo-usb", + .bus = &platform_bus_type, + .probe = tahvo_usb_probe, + .remove = tahvo_usb_remove, +}; + +static struct platform_device tahvo_usb_device = { + .name = "tahvo-usb", + .id = -1, +}; + +static int __init tahvo_usb_init(void) +{ + int ret = 0; + + printk(KERN_INFO "Tahvo USB transceiver driver initializing\n"); + ret = driver_register(&tahvo_usb_driver); + if (ret) + return ret; + ret = platform_device_register(&tahvo_usb_device); + if (ret < 0) { + driver_unregister(&tahvo_usb_driver); + return ret; + } + ret = driver_register(&omap_otg_driver); + if (ret) { + platform_device_unregister(&tahvo_usb_device); + driver_unregister(&tahvo_usb_driver); + return ret; + } + return 0; +} + +subsys_initcall(tahvo_usb_init); + +static void __exit tahvo_usb_exit(void) +{ + driver_unregister(&omap_otg_driver); + platform_device_unregister(&tahvo_usb_device); + driver_unregister(&tahvo_usb_driver); +} +module_exit(tahvo_usb_exit); + +MODULE_DESCRIPTION("Tahvo USB OTG Transceiver Driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs");