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Date: Wed, 29 Aug 2012 12:26:34 +0530
From: Venu Byravarasu <vbyravarasu@...dia.com>
To: Peter Chen <hzpeterchen@...il.com>
CC: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"balbi@...com" <balbi@...com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH] usb: otg: Move phy interface to separate file.
> -----Original Message-----
> From: Peter Chen [mailto:hzpeterchen@...il.com]
> Sent: Wednesday, August 29, 2012 7:30 AM
> To: Venu Byravarasu
> Cc: gregkh@...uxfoundation.org; balbi@...com; linux-
> kernel@...r.kernel.org; linux-usb@...r.kernel.org
> Subject: Re: [PATCH] usb: otg: Move phy interface to separate file.
>
> >
> > #include <linux/notifier.h>
> > +#include <linux/usb/phy.h>
> >
> one small thing: <linux/notifier.h> is only needed at phy.h.
Thanks Peter, for your comment.
Will send an updated patch.
>
> > /* OTG defines lots of enumeration states before device reset */
> > enum usb_otg_state {
> > @@ -35,31 +36,6 @@ enum usb_otg_state {
> > OTG_STATE_A_VBUS_ERR,
> > };
> >
> > -enum usb_phy_events {
> > - USB_EVENT_NONE, /* no events or cable disconnected */
> > - USB_EVENT_VBUS, /* vbus valid event */
> > - USB_EVENT_ID, /* id was grounded */
> > - USB_EVENT_CHARGER, /* usb dedicated charger */
> > - USB_EVENT_ENUMERATED, /* gadget driver enumerated */
> > -};
> > -
> > -/* associate a type with PHY */
> > -enum usb_phy_type {
> > - USB_PHY_TYPE_UNDEFINED,
> > - USB_PHY_TYPE_USB2,
> > - USB_PHY_TYPE_USB3,
> > -};
> > -
> > -struct usb_phy;
> > -
> > -/* for transceivers connected thru an ULPI interface, the user must
> > - * provide access ops
> > - */
> > -struct usb_phy_io_ops {
> > - int (*read)(struct usb_phy *x, u32 reg);
> > - int (*write)(struct usb_phy *x, u32 val, u32 reg);
> > -};
> > -
> > struct usb_otg {
> > u8 default_a;
> >
> > @@ -85,134 +61,9 @@ struct usb_otg {
> >
> > };
> >
> > -/*
> > - * the otg driver needs to interact with both device side and host side
> > - * usb controllers. it decides which controller is active at a given
> > - * moment, using the transceiver, ID signal, HNP and sometimes static
> > - * configuration information (including "board isn't wired for otg").
> > - */
> > -struct usb_phy {
> > - struct device *dev;
> > - const char *label;
> > - unsigned int flags;
> > -
> > - enum usb_phy_type type;
> > - enum usb_otg_state state;
> > - enum usb_phy_events last_event;
> > -
> > - struct usb_otg *otg;
> > -
> > - struct device *io_dev;
> > - struct usb_phy_io_ops *io_ops;
> > - void __iomem *io_priv;
> > -
> > - /* for notification of usb_phy_events */
> > - struct atomic_notifier_head notifier;
> > -
> > - /* to pass extra port status to the root hub */
> > - u16 port_status;
> > - u16 port_change;
> > -
> > - /* to support controllers that have multiple transceivers */
> > - struct list_head head;
> > -
> > - /* initialize/shutdown the OTG controller */
> > - int (*init)(struct usb_phy *x);
> > - void (*shutdown)(struct usb_phy *x);
> > -
> > - /* effective for B devices, ignored for A-peripheral */
> > - int (*set_power)(struct usb_phy *x,
> > - unsigned mA);
> > -
> > - /* for non-OTG B devices: set transceiver into suspend mode */
> > - int (*set_suspend)(struct usb_phy *x,
> > - int suspend);
> > -
> > - /* notify phy connect status change */
> > - int (*notify_connect)(struct usb_phy *x, int port);
> > - int (*notify_disconnect)(struct usb_phy *x, int port);
> > -};
> > -
> > -
> > -/* for board-specific init logic */
> > -extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
> > -extern void usb_remove_phy(struct usb_phy *);
> > -
> > -#if defined(CONFIG_NOP_USB_XCEIV) ||
> (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
> > -/* sometimes transceivers are accessed only through e.g. ULPI */
> > -extern void usb_nop_xceiv_register(void);
> > -extern void usb_nop_xceiv_unregister(void);
> > -#else
> > -static inline void usb_nop_xceiv_register(void)
> > -{
> > -}
> > -
> > -static inline void usb_nop_xceiv_unregister(void)
> > -{
> > -}
> > -#endif
> > -
> > -/* helpers for direct access thru low-level io interface */
> > -static inline int usb_phy_io_read(struct usb_phy *x, u32 reg)
> > -{
> > - if (x->io_ops && x->io_ops->read)
> > - return x->io_ops->read(x, reg);
> > -
> > - return -EINVAL;
> > -}
> > -
> > -static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg)
> > -{
> > - if (x->io_ops && x->io_ops->write)
> > - return x->io_ops->write(x, val, reg);
> > -
> > - return -EINVAL;
> > -}
> > -
> > -static inline int
> > -usb_phy_init(struct usb_phy *x)
> > -{
> > - if (x->init)
> > - return x->init(x);
> > -
> > - return 0;
> > -}
> > -
> > -static inline void
> > -usb_phy_shutdown(struct usb_phy *x)
> > -{
> > - if (x->shutdown)
> > - x->shutdown(x);
> > -}
> > -
> > -/* for usb host and peripheral controller drivers */
> > #ifdef CONFIG_USB_OTG_UTILS
> > -extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
> > -extern struct usb_phy *devm_usb_get_phy(struct device *dev,
> > - enum usb_phy_type type);
> > -extern void usb_put_phy(struct usb_phy *);
> > -extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
> > extern const char *otg_state_string(enum usb_otg_state state);
> > #else
> > -static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
> > -{
> > - return NULL;
> > -}
> > -
> > -static inline struct usb_phy *devm_usb_get_phy(struct device *dev,
> > - enum usb_phy_type type)
> > -{
> > - return NULL;
> > -}
> > -
> > -static inline void usb_put_phy(struct usb_phy *x)
> > -{
> > -}
> > -
> > -static inline void devm_usb_put_phy(struct device *dev, struct usb_phy
> *x)
> > -{
> > -}
> > -
> > static inline const char *otg_state_string(enum usb_otg_state state)
> > {
> > return NULL;
> > @@ -262,42 +113,6 @@ otg_set_peripheral(struct usb_otg *otg, struct
> usb_gadget *periph)
> > }
> >
> > static inline int
> > -usb_phy_set_power(struct usb_phy *x, unsigned mA)
> > -{
> > - if (x && x->set_power)
> > - return x->set_power(x, mA);
> > - return 0;
> > -}
> > -
> > -/* Context: can sleep */
> > -static inline int
> > -usb_phy_set_suspend(struct usb_phy *x, int suspend)
> > -{
> > - if (x->set_suspend != NULL)
> > - return x->set_suspend(x, suspend);
> > - else
> > - return 0;
> > -}
> > -
> > -static inline int
> > -usb_phy_notify_connect(struct usb_phy *x, int port)
> > -{
> > - if (x->notify_connect)
> > - return x->notify_connect(x, port);
> > - else
> > - return 0;
> > -}
> > -
> > -static inline int
> > -usb_phy_notify_disconnect(struct usb_phy *x, int port)
> > -{
> > - if (x->notify_disconnect)
> > - return x->notify_disconnect(x, port);
> > - else
> > - return 0;
> > -}
> > -
> > -static inline int
> > otg_start_srp(struct usb_otg *otg)
> > {
> > if (otg && otg->start_srp)
> > @@ -306,31 +121,7 @@ otg_start_srp(struct usb_otg *otg)
> > return -ENOTSUPP;
> > }
> >
> > -/* notifiers */
> > -static inline int
> > -usb_register_notifier(struct usb_phy *x, struct notifier_block *nb)
> > -{
> > - return atomic_notifier_chain_register(&x->notifier, nb);
> > -}
> > -
> > -static inline void
> > -usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
> > -{
> > - atomic_notifier_chain_unregister(&x->notifier, nb);
> > -}
> > -
> > /* for OTG controller drivers (and maybe other stuff) */
> > extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
> >
> > -static inline const char *usb_phy_type_string(enum usb_phy_type type)
> > -{
> > - switch (type) {
> > - case USB_PHY_TYPE_USB2:
> > - return "USB2 PHY";
> > - case USB_PHY_TYPE_USB3:
> > - return "USB3 PHY";
> > - default:
> > - return "UNKNOWN PHY TYPE";
> > - }
> > -}
> > #endif /* __LINUX_USB_OTG_H */
> > diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
> > new file mode 100644
> > index 0000000..5a2bcbe
> > --- /dev/null
> > +++ b/include/linux/usb/phy.h
> > @@ -0,0 +1,222 @@
> > +/* USB OTG (On The Go) defines */
> > +/*
> > + *
> > + * These APIs may be used between USB controllers. USB device drivers
> > + * (for either host or peripheral roles) don't use these calls; they
> > + * continue to use just usb_device and usb_gadget.
> > + */
> > +
> > +#ifndef __LINUX_USB_PHY_H
> > +#define __LINUX_USB_PHY_H
> > +
> > +#include <linux/notifier.h>
> > +
> > +enum usb_phy_events {
> > + USB_EVENT_NONE, /* no events or cable disconnected */
> > + USB_EVENT_VBUS, /* vbus valid event */
> > + USB_EVENT_ID, /* id was grounded */
> > + USB_EVENT_CHARGER, /* usb dedicated charger */
> > + USB_EVENT_ENUMERATED, /* gadget driver enumerated */
> > +};
> > +
> > +/* associate a type with PHY */
> > +enum usb_phy_type {
> > + USB_PHY_TYPE_UNDEFINED,
> > + USB_PHY_TYPE_USB2,
> > + USB_PHY_TYPE_USB3,
> > +};
> > +
> > +struct usb_phy;
> > +struct usb_otg;
> > +
> > +/* for transceivers connected thru an ULPI interface, the user must
> > + * provide access ops
> > + */
> > +struct usb_phy_io_ops {
> > + int (*read)(struct usb_phy *x, u32 reg);
> > + int (*write)(struct usb_phy *x, u32 val, u32 reg);
> > +};
> > +
> > +struct usb_phy {
> > + struct device *dev;
> > + const char *label;
> > + unsigned int flags;
> > +
> > + enum usb_phy_type type;
> > + enum usb_phy_events last_event;
> > +
> > + struct usb_otg *otg;
> > +
> > + struct device *io_dev;
> > + struct usb_phy_io_ops *io_ops;
> > + void __iomem *io_priv;
> > +
> > + /* for notification of usb_phy_events */
> > + struct atomic_notifier_head notifier;
> > +
> > + /* to pass extra port status to the root hub */
> > + u16 port_status;
> > + u16 port_change;
> > +
> > + /* to support controllers that have multiple transceivers */
> > + struct list_head head;
> > +
> > + /* initialize/shutdown the OTG controller */
> > + int (*init)(struct usb_phy *x);
> > + void (*shutdown)(struct usb_phy *x);
> > +
> > + /* effective for B devices, ignored for A-peripheral */
> > + int (*set_power)(struct usb_phy *x,
> > + unsigned mA);
> > +
> > + /* for non-OTG B devices: set transceiver into suspend mode */
> > + int (*set_suspend)(struct usb_phy *x,
> > + int suspend);
> > +
> > + /* notify phy connect status change */
> > + int (*notify_connect)(struct usb_phy *x, int port);
> > + int (*notify_disconnect)(struct usb_phy *x, int port);
> > +};
> > +
> > +
> > +/* for board-specific init logic */
> > +extern int usb_add_phy(struct usb_phy *, enum usb_phy_type type);
> > +extern void usb_remove_phy(struct usb_phy *);
> > +
> > +#if defined(CONFIG_NOP_USB_XCEIV) ||
> (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
> > +/* sometimes transceivers are accessed only through e.g. ULPI */
> > +extern void usb_nop_xceiv_register(void);
> > +extern void usb_nop_xceiv_unregister(void);
> > +#else
> > +static inline void usb_nop_xceiv_register(void)
> > +{
> > +}
> > +
> > +static inline void usb_nop_xceiv_unregister(void)
> > +{
> > +}
> > +#endif
> > +
> > +/* helpers for direct access thru low-level io interface */
> > +static inline int usb_phy_io_read(struct usb_phy *x, u32 reg)
> > +{
> > + if (x->io_ops && x->io_ops->read)
> > + return x->io_ops->read(x, reg);
> > +
> > + return -EINVAL;
> > +}
> > +
> > +static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg)
> > +{
> > + if (x->io_ops && x->io_ops->write)
> > + return x->io_ops->write(x, val, reg);
> > +
> > + return -EINVAL;
> > +}
> > +
> > +static inline int
> > +usb_phy_init(struct usb_phy *x)
> > +{
> > + if (x->init)
> > + return x->init(x);
> > +
> > + return 0;
> > +}
> > +
> > +static inline void
> > +usb_phy_shutdown(struct usb_phy *x)
> > +{
> > + if (x->shutdown)
> > + x->shutdown(x);
> > +}
> > +
> > +/* for usb host and peripheral controller drivers */
> > +#ifdef CONFIG_USB_OTG_UTILS
> > +extern struct usb_phy *usb_get_phy(enum usb_phy_type type);
> > +extern struct usb_phy *devm_usb_get_phy(struct device *dev,
> > + enum usb_phy_type type);
> > +extern void usb_put_phy(struct usb_phy *);
> > +extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
> > +#else
> > +static inline struct usb_phy *usb_get_phy(enum usb_phy_type type)
> > +{
> > + return NULL;
> > +}
> > +
> > +static inline struct usb_phy *devm_usb_get_phy(struct device *dev,
> > + enum usb_phy_type type)
> > +{
> > + return NULL;
> > +}
> > +
> > +static inline void usb_put_phy(struct usb_phy *x)
> > +{
> > +}
> > +
> > +static inline void devm_usb_put_phy(struct device *dev, struct usb_phy
> *x)
> > +{
> > +}
> > +
> > +#endif
> > +
> > +static inline int
> > +usb_phy_set_power(struct usb_phy *x, unsigned mA)
> > +{
> > + if (x && x->set_power)
> > + return x->set_power(x, mA);
> > + return 0;
> > +}
> > +
> > +/* Context: can sleep */
> > +static inline int
> > +usb_phy_set_suspend(struct usb_phy *x, int suspend)
> > +{
> > + if (x->set_suspend != NULL)
> > + return x->set_suspend(x, suspend);
> > + else
> > + return 0;
> > +}
> > +
> > +static inline int
> > +usb_phy_notify_connect(struct usb_phy *x, int port)
> > +{
> > + if (x->notify_connect)
> > + return x->notify_connect(x, port);
> > + else
> > + return 0;
> > +}
> > +
> > +static inline int
> > +usb_phy_notify_disconnect(struct usb_phy *x, int port)
> > +{
> > + if (x->notify_disconnect)
> > + return x->notify_disconnect(x, port);
> > + else
> > + return 0;
> > +}
> > +
> > +/* notifiers */
> > +static inline int
> > +usb_register_notifier(struct usb_phy *x, struct notifier_block *nb)
> > +{
> > + return atomic_notifier_chain_register(&x->notifier, nb);
> > +}
> > +
> > +static inline void
> > +usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
> > +{
> > + atomic_notifier_chain_unregister(&x->notifier, nb);
> > +}
> > +
> > +static inline const char *usb_phy_type_string(enum usb_phy_type type)
> > +{
> > + switch (type) {
> > + case USB_PHY_TYPE_USB2:
> > + return "USB2 PHY";
> > + case USB_PHY_TYPE_USB3:
> > + return "USB3 PHY";
> > + default:
> > + return "UNKNOWN PHY TYPE";
> > + }
> > +}
> > +#endif /* __LINUX_USB_PHY_H */
> > --
> > 1.7.1.1
> >
> > --
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