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usb: chipidea: add support for roles 

Add some generic code for roles and implement simple role switching
based on ID pin state and/or a sysfs file. At this, we also rename
the device to ci_hdrc, which is what it is.

The "manual" switch is made into a sysfs file and not debugfs, because
it might be useful even in non-debug context. For some boards, like
sheevaplug, it seems to be the only way to switch roles without modifying
the hardware, since the ID pin is always grounded.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2012-05-11 17:25:47 +03:00 committed by Greg Kroah-Hartman
parent e443b33362
commit 5f36e231e9
7 changed files with 330 additions and 120 deletions
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18
drivers/usb/chipidea/bits.h
View File

@ -50,6 +50,24 @@
#define DEVLC_PSPD (0x03UL << 25)
#define DEVLC_PSPD_HS (0x02UL << 25)
/* OTGSC */
#define OTGSC_IDPU BIT(5)
#define OTGSC_ID BIT(8)
#define OTGSC_AVV BIT(9)
#define OTGSC_ASV BIT(10)
#define OTGSC_BSV BIT(11)
#define OTGSC_BSE BIT(12)
#define OTGSC_IDIS BIT(16)
#define OTGSC_AVVIS BIT(17)
#define OTGSC_ASVIS BIT(18)
#define OTGSC_BSVIS BIT(19)
#define OTGSC_BSEIS BIT(20)
#define OTGSC_IDIE BIT(24)
#define OTGSC_AVVIE BIT(25)
#define OTGSC_ASVIE BIT(26)
#define OTGSC_BSVIE BIT(27)
#define OTGSC_BSEIE BIT(28)
/* USBMODE */
#define USBMODE_CM (0x03UL << 0)
#define USBMODE_CM_IDLE (0x00UL << 0)

64
drivers/usb/chipidea/ci.h
View File

@ -14,6 +14,7 @@
#define __DRIVERS_USB_CHIPIDEA_CI_H
#include <linux/list.h>
#include <linux/irqreturn.h>
#include <linux/usb/gadget.h>
/******************************************************************************
@ -47,6 +48,26 @@ struct ci13xxx_ep {
struct dma_pool *td_pool;
};
enum ci_role {
CI_ROLE_HOST = 0,
CI_ROLE_GADGET,
CI_ROLE_END,
};
/**
* struct ci_role_driver - host/gadget role driver
* start: start this role
* stop: stop this role
* irq: irq handler for this role
* name: role name string (host/gadget)
*/
struct ci_role_driver {
int (*start)(struct ci13xxx *);
void (*stop)(struct ci13xxx *);
irqreturn_t (*irq)(struct ci13xxx *);
const char *name;
};
struct hw_bank {
unsigned lpm; /* is LPM? */
void __iomem *abs; /* bus map offset */
@ -85,8 +106,47 @@ struct ci13xxx {
struct ci13xxx_udc_driver *udc_driver; /* device controller driver */
int vbus_active; /* is VBUS active */
struct usb_phy *transceiver; /* Transceiver struct */
struct ci_role_driver *roles[CI_ROLE_END];
enum ci_role role;
bool is_otg;
struct work_struct work;
struct workqueue_struct *wq;
};
static inline struct ci_role_driver *ci_role(struct ci13xxx *ci)
{
BUG_ON(ci->role >= CI_ROLE_END || !ci->roles[ci->role]);
return ci->roles[ci->role];
}
static inline int ci_role_start(struct ci13xxx *ci, enum ci_role role)
{
int ret;
if (role >= CI_ROLE_END)
return -EINVAL;
if (!ci->roles[role])
return -ENXIO;
ret = ci->roles[role]->start(ci);
if (!ret)
ci->role = role;
return ret;
}
static inline void ci_role_stop(struct ci13xxx *ci)
{
enum ci_role role = ci->role;
if (role == CI_ROLE_END)
return;
ci->role = CI_ROLE_END;
ci->roles[role]->stop(ci);
}
/******************************************************************************
* REGISTERS
*****************************************************************************/
@ -107,6 +167,7 @@ enum ci13xxx_regs {
OP_ENDPTLISTADDR,
OP_PORTSC,
OP_DEVLC,
OP_OTGSC,
OP_USBMODE,
OP_ENDPTSETUPSTAT,
OP_ENDPTPRIME,
@ -118,7 +179,6 @@ enum ci13xxx_regs {
OP_LAST = OP_ENDPTCTRL + ENDPT_MAX / 2,
};
/**
* ffs_nr: find first (least significant) bit set
* @x: the word to search
@ -193,8 +253,6 @@ static inline u32 hw_test_and_write(struct ci13xxx *udc, enum ci13xxx_regs reg,
return (val & mask) >> ffs_nr(mask);
}
int hw_device_init(struct ci13xxx *udc, void __iomem *base,
uintptr_t cap_offset);
int hw_device_reset(struct ci13xxx *ci);
int hw_port_test_set(struct ci13xxx *ci, u8 mode);

4
drivers/usb/chipidea/ci13xxx_msm.c
View File

@ -62,9 +62,9 @@ static int ci13xxx_msm_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "ci13xxx_msm_probe\n");
plat_ci = platform_device_alloc("ci_udc", -1);
plat_ci = platform_device_alloc("ci_hdrc", -1);
if (!plat_ci) {
dev_err(&pdev->dev, "can't allocate ci_udc platform device\n");
dev_err(&pdev->dev, "can't allocate ci_hdrc platform device\n");
return -ENOMEM;
}

4
drivers/usb/chipidea/ci13xxx_pci.c
View File

@ -69,9 +69,9 @@ static int __devinit ci13xxx_pci_probe(struct pci_dev *pdev,
pci_set_master(pdev);
pci_try_set_mwi(pdev);
plat_ci = platform_device_alloc("ci_udc", -1);
plat_ci = platform_device_alloc("ci_hdrc", -1);
if (!plat_ci) {
dev_err(&pdev->dev, "can't allocate ci_udc platform device\n");
dev_err(&pdev->dev, "can't allocate ci_hdrc platform device\n");
retval = -ENOMEM;
goto disable_device;
}

256
drivers/usb/chipidea/core.c
View File

@ -75,7 +75,7 @@
/* MSM specific */
#define ABS_AHBBURST (0x0090UL)
#define ABS_AHBMODE (0x0098UL)
/* UDC register map */
/* Controller register map */
static uintptr_t ci_regs_nolpm[] = {
[CAP_CAPLENGTH] = 0x000UL,
[CAP_HCCPARAMS] = 0x008UL,
@ -88,6 +88,7 @@ static uintptr_t ci_regs_nolpm[] = {
[OP_ENDPTLISTADDR] = 0x018UL,
[OP_PORTSC] = 0x044UL,
[OP_DEVLC] = 0x084UL,
[OP_OTGSC] = 0x064UL,
[OP_USBMODE] = 0x068UL,
[OP_ENDPTSETUPSTAT] = 0x06CUL,
[OP_ENDPTPRIME] = 0x070UL,
@ -109,6 +110,7 @@ static uintptr_t ci_regs_lpm[] = {
[OP_ENDPTLISTADDR] = 0x018UL,
[OP_PORTSC] = 0x044UL,
[OP_DEVLC] = 0x084UL,
[OP_OTGSC] = 0x0C4UL,
[OP_USBMODE] = 0x0C8UL,
[OP_ENDPTSETUPSTAT] = 0x0D8UL,
[OP_ENDPTPRIME] = 0x0DCUL,
@ -118,24 +120,24 @@ static uintptr_t ci_regs_lpm[] = {
[OP_ENDPTCTRL] = 0x0ECUL,
};
static int hw_alloc_regmap(struct ci13xxx *udc, bool is_lpm)
static int hw_alloc_regmap(struct ci13xxx *ci, bool is_lpm)
{
int i;
kfree(udc->hw_bank.regmap);
kfree(ci->hw_bank.regmap);
udc->hw_bank.regmap = kzalloc((OP_LAST + 1) * sizeof(void *),
GFP_KERNEL);
if (!udc->hw_bank.regmap)
ci->hw_bank.regmap = kzalloc((OP_LAST + 1) * sizeof(void *),
GFP_KERNEL);
if (!ci->hw_bank.regmap)
return -ENOMEM;
for (i = 0; i < OP_ENDPTCTRL; i++)
udc->hw_bank.regmap[i] =
(i <= CAP_LAST ? udc->hw_bank.cap : udc->hw_bank.op) +
ci->hw_bank.regmap[i] =
(i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
(is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
for (; i <= OP_LAST; i++)
udc->hw_bank.regmap[i] = udc->hw_bank.op +
ci->hw_bank.regmap[i] = ci->hw_bank.op +
4 * (i - OP_ENDPTCTRL) +
(is_lpm
? ci_regs_lpm[OP_ENDPTCTRL]
@ -171,36 +173,35 @@ u8 hw_port_test_get(struct ci13xxx *ci)
return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> ffs_nr(PORTSC_PTC);
}
int hw_device_init(struct ci13xxx *udc, void __iomem *base,
uintptr_t cap_offset)
static int hw_device_init(struct ci13xxx *ci, void __iomem *base)
{
u32 reg;
/* bank is a module variable */
udc->hw_bank.abs = base;
ci->hw_bank.abs = base;
udc->hw_bank.cap = udc->hw_bank.abs;
udc->hw_bank.cap += cap_offset;
udc->hw_bank.op = udc->hw_bank.cap + ioread8(udc->hw_bank.cap);
ci->hw_bank.cap = ci->hw_bank.abs;
ci->hw_bank.cap += ci->udc_driver->capoffset;
ci->hw_bank.op = ci->hw_bank.cap + ioread8(ci->hw_bank.cap);
hw_alloc_regmap(udc, false);
reg = hw_read(udc, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
hw_alloc_regmap(ci, false);
reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
ffs_nr(HCCPARAMS_LEN);
udc->hw_bank.lpm = reg;
hw_alloc_regmap(udc, !!reg);
udc->hw_bank.size = udc->hw_bank.op - udc->hw_bank.abs;
udc->hw_bank.size += OP_LAST;
udc->hw_bank.size /= sizeof(u32);
ci->hw_bank.lpm = reg;
hw_alloc_regmap(ci, !!reg);
ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
ci->hw_bank.size += OP_LAST;
ci->hw_bank.size /= sizeof(u32);
reg = hw_read(udc, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
ffs_nr(DCCPARAMS_DEN);
udc->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
if (udc->hw_ep_max == 0 || udc->hw_ep_max > ENDPT_MAX)
if (ci->hw_ep_max == 0 || ci->hw_ep_max > ENDPT_MAX)
return -ENODEV;
dev_dbg(udc->dev, "ChipIdea UDC found, lpm: %d; cap: %p op: %p\n",
udc->hw_bank.lpm, udc->hw_bank.cap, udc->hw_bank.op);
dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n",
ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
/* setup lock mode ? */
@ -250,16 +251,98 @@ int hw_device_reset(struct ci13xxx *ci)
return 0;
}
static int __devinit ci_udc_probe(struct platform_device *pdev)
/**
* ci_otg_role - pick role based on ID pin state
* @ci: the controller
*/
static enum ci_role ci_otg_role(struct ci13xxx *ci)
{
u32 sts = hw_read(ci, OP_OTGSC, ~0);
enum ci_role role = sts & OTGSC_ID
? CI_ROLE_GADGET
: CI_ROLE_HOST;
return role;
}
/**
* ci_role_work - perform role changing based on ID pin
* @work: work struct
*/
static void ci_role_work(struct work_struct *work)
{
struct ci13xxx *ci = container_of(work, struct ci13xxx, work);
enum ci_role role = ci_otg_role(ci);
hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS);
if (role != ci->role) {
dev_dbg(ci->dev, "switching from %s to %s\n",
ci_role(ci)->name, ci->roles[role]->name);
ci_role_stop(ci);
ci_role_start(ci, role);
}
}
static ssize_t show_role(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct ci13xxx *ci = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", ci_role(ci)->name);
}
static ssize_t store_role(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct ci13xxx *ci = dev_get_drvdata(dev);
enum ci_role role;
int ret;
for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
if (ci->roles[role] && !strcmp(buf, ci->roles[role]->name))
break;
if (role == CI_ROLE_END || role == ci->role)
return -EINVAL;
ci_role_stop(ci);
ret = ci_role_start(ci, role);
if (ret)
return ret;
return count;
}
static DEVICE_ATTR(role, S_IRUSR | S_IWUSR, show_role, store_role);
static irqreturn_t ci_irq(int irq, void *data)
{
struct ci13xxx *ci = data;
irqreturn_t ret = IRQ_NONE;
if (ci->is_otg) {
u32 sts = hw_read(ci, OP_OTGSC, ~0);
if (sts & OTGSC_IDIS) {
queue_work(ci->wq, &ci->work);
ret = IRQ_HANDLED;
}
}
return ci->role == CI_ROLE_END ? ret : ci_role(ci)->irq(ci);
}
static int __devinit ci_hdrc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ci13xxx_udc_driver *driver = dev->platform_data;
struct ci13xxx *udc;
struct ci13xxx *ci;
struct resource *res;
void __iomem *base;
int ret;
if (!driver) {
if (!dev->platform_data) {
dev_err(dev, "platform data missing\n");
return -ENODEV;
}
@ -276,49 +359,112 @@ static int __devinit ci_udc_probe(struct platform_device *pdev)
return -ENOMEM;
}
ret = udc_probe(driver, dev, base, &udc);
if (ret)
return ret;
udc->irq = platform_get_irq(pdev, 0);
if (udc->irq < 0) {
dev_err(dev, "missing IRQ\n");
ret = -ENODEV;
goto out;
ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
if (!ci) {
dev_err(dev, "can't allocate device\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, udc);
ret = request_irq(udc->irq, udc_irq, IRQF_SHARED, driver->name, udc);
ci->dev = dev;
ci->udc_driver = dev->platform_data;
out:
ret = hw_device_init(ci, base);
if (ret < 0) {
dev_err(dev, "can't initialize hardware\n");
return -ENODEV;
}
ci->irq = platform_get_irq(pdev, 0);
if (ci->irq < 0) {
dev_err(dev, "missing IRQ\n");
return -ENODEV;
}
INIT_WORK(&ci->work, ci_role_work);
ci->wq = create_singlethread_workqueue("ci_otg");
if (!ci->wq) {
dev_err(dev, "can't create workqueue\n");
return -ENODEV;
}
/* initialize role(s) before the interrupt is requested */
ret = ci_hdrc_gadget_init(ci);
if (ret)
udc_remove(udc);
dev_info(dev, "doesn't support gadget\n");
if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
dev_err(dev, "no supported roles\n");
ret = -ENODEV;
goto rm_wq;
}
if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
ci->is_otg = true;
ci->role = ci_otg_role(ci);
} else {
ci->role = ci->roles[CI_ROLE_HOST]
? CI_ROLE_HOST
: CI_ROLE_GADGET;
}
ret = ci_role_start(ci, ci->role);
if (ret) {
dev_err(dev, "can't start %s role\n", ci_role(ci)->name);
ret = -ENODEV;
goto rm_wq;
}
platform_set_drvdata(pdev, ci);
ret = request_irq(ci->irq, ci_irq, IRQF_SHARED, ci->udc_driver->name,
ci);
if (ret)
goto stop;
ret = device_create_file(dev, &dev_attr_role);
if (ret)
goto rm_attr;
if (ci->is_otg)
hw_write(ci, OP_OTGSC, OTGSC_IDIE, OTGSC_IDIE);
return ret;
rm_attr:
device_remove_file(dev, &dev_attr_role);
stop:
ci_role_stop(ci);
rm_wq:
flush_workqueue(ci->wq);
destroy_workqueue(ci->wq);
return ret;
}
static int __devexit ci_udc_remove(struct platform_device *pdev)
static int __devexit ci_hdrc_remove(struct platform_device *pdev)
{
struct ci13xxx *udc = platform_get_drvdata(pdev);
struct ci13xxx *ci = platform_get_drvdata(pdev);
free_irq(udc->irq, udc);
udc_remove(udc);
flush_workqueue(ci->wq);
destroy_workqueue(ci->wq);
device_remove_file(ci->dev, &dev_attr_role);
free_irq(ci->irq, ci);
ci_role_stop(ci);
return 0;
}
static struct platform_driver ci_udc_driver = {
.probe = ci_udc_probe,
.remove = __devexit_p(ci_udc_remove),
static struct platform_driver ci_hdrc_driver = {
.probe = ci_hdrc_probe,
.remove = __devexit_p(ci_hdrc_remove),
.driver = {
.name = "ci_udc",
.name = "ci_hdrc",
},
};
module_platform_driver(ci_udc_driver);
module_platform_driver(ci_hdrc_driver);
MODULE_ALIAS("platform:ci_udc");
MODULE_ALIAS("platform:ci_hdrc");
MODULE_ALIAS("platform:ci13xxx");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
MODULE_DESCRIPTION("ChipIdea UDC Driver");
MODULE_DESCRIPTION("ChipIdea HDRC Driver");

82
drivers/usb/chipidea/udc.c
View File

@ -1592,14 +1592,13 @@ static int ci13xxx_stop(struct usb_gadget *gadget,
* BUS block
*****************************************************************************/
/**
* udc_irq: global interrupt handler
* udc_irq: udc interrupt handler
*
* This function returns IRQ_HANDLED if the IRQ has been handled
* It locks access to registers
*/
irqreturn_t udc_irq(int irq, void *data)
static irqreturn_t udc_irq(struct ci13xxx *udc)
{
struct ci13xxx *udc = data;
irqreturn_t retval;
u32 intr;
@ -1666,38 +1665,24 @@ static void udc_release(struct device *dev)
}
/**
* udc_probe: parent probe must call this to initialize UDC
* @dev: parent device
* @regs: registers base address
* @name: driver name
*
* This function returns an error code
* No interrupts active, the IRQ has not been requested yet
* Kernel assumes 32-bit DMA operations by default, no need to dma_set_mask
* udc_start: initialize gadget role
* @udc: chipidea controller
*/
int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
void __iomem *regs, struct ci13xxx **_udc)
static int udc_start(struct ci13xxx *udc)
{
struct ci13xxx *udc;
struct device *dev = udc->dev;
int retval = 0;
if (dev == NULL || regs == NULL || driver == NULL ||
driver->name == NULL)
if (!udc)
return -EINVAL;
udc = kzalloc(sizeof(struct ci13xxx), GFP_KERNEL);
if (udc == NULL)
return -ENOMEM;
spin_lock_init(&udc->lock);
udc->regs = regs;
udc->udc_driver = driver;
udc->gadget.ops = &usb_gadget_ops;
udc->gadget.speed = USB_SPEED_UNKNOWN;
udc->gadget.max_speed = USB_SPEED_HIGH;
udc->gadget.is_otg = 0;
udc->gadget.name = driver->name;
udc->gadget.name = udc->udc_driver->name;
INIT_LIST_HEAD(&udc->gadget.ep_list);
@ -1707,16 +1692,12 @@ int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
udc->gadget.dev.parent = dev;
udc->gadget.dev.release = udc_release;
udc->dev = dev;
/* alloc resources */
udc->qh_pool = dma_pool_create("ci13xxx_qh", dev,
sizeof(struct ci13xxx_qh),
64, CI13XXX_PAGE_SIZE);
if (udc->qh_pool == NULL) {
retval = -ENOMEM;
goto free_udc;
}
if (udc->qh_pool == NULL)
return -ENOMEM;
udc->td_pool = dma_pool_create("ci13xxx_td", dev,
sizeof(struct ci13xxx_td),
@ -1726,10 +1707,6 @@ int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
goto free_qh_pool;
}
retval = hw_device_init(udc, regs, driver->capoffset);
if (retval < 0)
goto free_pools;
retval = init_eps(udc);
if (retval)
goto free_pools;
@ -1775,7 +1752,6 @@ int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
pm_runtime_no_callbacks(&udc->gadget.dev);
pm_runtime_enable(&udc->gadget.dev);
*_udc = udc;
return retval;
remove_trans:
@ -1796,9 +1772,6 @@ free_pools:
dma_pool_destroy(udc->td_pool);
free_qh_pool:
dma_pool_destroy(udc->qh_pool);
free_udc:
kfree(udc);
*_udc = NULL;
return retval;
}
@ -1807,7 +1780,7 @@ free_udc:
*
* No interrupts active, the IRQ has been released
*/
void udc_remove(struct ci13xxx *udc)
static void udc_stop(struct ci13xxx *udc)
{
int i;
@ -1826,12 +1799,37 @@ void udc_remove(struct ci13xxx *udc)
dma_pool_destroy(udc->qh_pool);
if (udc->transceiver) {
otg_set_peripheral(udc->transceiver->otg, &udc->gadget);
otg_set_peripheral(udc->transceiver->otg, NULL);
usb_put_transceiver(udc->transceiver);
}
dbg_remove_files(&udc->gadget.dev);
device_unregister(&udc->gadget.dev);
kfree(udc->hw_bank.regmap);
kfree(udc);
/* my kobject is dynamic, I swear! */
memset(&udc->gadget, 0, sizeof(udc->gadget));
}
/**
* ci_hdrc_gadget_init - initialize device related bits
* ci: the controller
*
* This function enables the gadget role, if the device is "device capable".
*/
int ci_hdrc_gadget_init(struct ci13xxx *ci)
{
struct ci_role_driver *rdrv;
if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
return -ENXIO;
rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
if (!rdrv)
return -ENOMEM;
rdrv->start = udc_start;
rdrv->stop = udc_stop;
rdrv->irq = udc_irq;
rdrv->name = "gadget";
ci->roles[CI_ROLE_GADGET] = rdrv;
return 0;
}

22
drivers/usb/chipidea/udc.h
View File

@ -71,26 +71,16 @@ struct ci13xxx_req {
};
#ifdef CONFIG_USB_CHIPIDEA_UDC
irqreturn_t udc_irq(int irq, void *data);
int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
void __iomem *regs, struct ci13xxx **_udc);
void udc_remove(struct ci13xxx *udc);
int ci_hdrc_gadget_init(struct ci13xxx *ci);
#else
static inline irqreturn_t udc_irq(int irq, void *data)
static inline int ci_hdrc_gadget_init(struct ci13xxx *ci)
{
return IRQ_NONE;
return -ENXIO;
}
static inline
int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
void __iomem *regs, struct ci13xxx **_udc)
{
return -ENODEV;
}
static inline void udc_remove(struct ci13xxx *udc)
{
}
#endif
#endif /* __DRIVERS_USB_CHIPIDEA_UDC_H */