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usb: chipidea: add support for roles

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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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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);