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USB OTG: add support for ulpi connected external transceivers

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This adds support for OTG transceivers directly connected to the ULPI
interface. In particular, the following details are added

- a struct for low level io functions (read/write)
- a priv field to be used as 'viewport' by low level access functions
- an (*init) and (*shutdown) callbacks, along with static inline helpers
- a (*set_vbus) callback to switch the port power on and off
- a flags field for per-transceiver settings
- some defines for the flags bitmask to configure platform specific
  details

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Heikki Krogerus <ext-heikki.krogerus@nokia.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Daniel Mack 2009-10-15 17:09:34 +03:00 committed by Greg Kroah-Hartman
parent c3f22d92a1
commit 91c8a5a998
1 changed files with 67 additions and 1 deletions
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68
include/linux/usb/otg.h
View file

@ -33,6 +33,23 @@ enum usb_otg_state {
OTG_STATE_A_VBUS_ERR,
};
#define USB_OTG_PULLUP_ID (1 << 0)
#define USB_OTG_PULLDOWN_DP (1 << 1)
#define USB_OTG_PULLDOWN_DM (1 << 2)
#define USB_OTG_EXT_VBUS_INDICATOR (1 << 3)
#define USB_OTG_DRV_VBUS (1 << 4)
#define USB_OTG_DRV_VBUS_EXT (1 << 5)
struct otg_transceiver;
/* for transceivers connected thru an ULPI interface, the user must
* provide access ops
*/
struct otg_io_access_ops {
int (*read)(struct otg_transceiver *otg, u32 reg);
int (*write)(struct otg_transceiver *otg, u32 val, u32 reg);
};
/*
* the otg driver needs to interact with both device side and host side
* usb controllers. it decides which controller is active at a given
@ -42,6 +59,7 @@ enum usb_otg_state {
struct otg_transceiver {
struct device *dev;
const char *label;
unsigned int flags;
u8 default_a;
enum usb_otg_state state;
@ -49,10 +67,17 @@ struct otg_transceiver {
struct usb_bus *host;
struct usb_gadget *gadget;
struct otg_io_access_ops *io_ops;
void __iomem *io_priv;
/* to pass extra port status to the root hub */
u16 port_status;
u16 port_change;
/* initialize/shutdown the OTG controller */
int (*init)(struct otg_transceiver *otg);
void (*shutdown)(struct otg_transceiver *otg);
/* bind/unbind the host controller */
int (*set_host)(struct otg_transceiver *otg,
struct usb_bus *host);
@ -65,6 +90,10 @@ struct otg_transceiver {
int (*set_power)(struct otg_transceiver *otg,
unsigned mA);
/* effective for A-peripheral, ignored for B devices */
int (*set_vbus)(struct otg_transceiver *otg,
bool enabled);
/* for non-OTG B devices: set transceiver into suspend mode */
int (*set_suspend)(struct otg_transceiver *otg,
int suspend);
@ -85,6 +114,38 @@ extern int otg_set_transceiver(struct otg_transceiver *);
extern void usb_nop_xceiv_register(void);
extern void usb_nop_xceiv_unregister(void);
/* helpers for direct access thru low-level io interface */
static inline int otg_io_read(struct otg_transceiver *otg, u32 reg)
{
if (otg->io_ops && otg->io_ops->read)
return otg->io_ops->read(otg, reg);
return -EINVAL;
}
static inline int otg_io_write(struct otg_transceiver *otg, u32 reg, u32 val)
{
if (otg->io_ops && otg->io_ops->write)
return otg->io_ops->write(otg, reg, val);
return -EINVAL;
}
static inline int
otg_init(struct otg_transceiver *otg)
{
if (otg->init)
return otg->init(otg);
return 0;
}
static inline void
otg_shutdown(struct otg_transceiver *otg)
{
if (otg->shutdown)
otg->shutdown(otg);
}
/* for usb host and peripheral controller drivers */
extern struct otg_transceiver *otg_get_transceiver(void);
@ -97,6 +158,12 @@ otg_start_hnp(struct otg_transceiver *otg)
return otg->start_hnp(otg);
}
/* Context: can sleep */
static inline int
otg_set_vbus(struct otg_transceiver *otg, bool enabled)
{
return otg->set_vbus(otg, enabled);
}
/* for HCDs */
static inline int
@ -105,7 +172,6 @@ otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
return otg->set_host(otg, host);
}
/* for usb peripheral controller drivers */
/* Context: can sleep */