--- /dev/null
+/**
+ * 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 <juha.yrjola@nokia.com>,
+ * Tony Lindgren <tony@atomide.com>, and
+ * Timo Teräs <timo.teras@nokia.com>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+#include <linux/kobject.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+
+#include <asm/irq.h>
+#include <mach/usb.h>
+
+#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");
projects / linux-2.6-omap-h63xx.git / blobdiff