Re: [PATCHv6 03/19] usb: otg: Separate otg members from usb_phy

From: ABRAHAM, KISHON VIJAY
Date: Mon Nov 07 2011 - 06:27:53 EST

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On Fri, Oct 28, 2011 at 6:05 PM, Heikki Krogerus
<heikki.krogerus@xxxxxxxxxxxxxxx> wrote:
> Introducing struct otg and collecting otg specific members
> to it from struct usb_phy. There are no changes to
> struct usb_phy at this stage. This also renames
> transceiver specific functions, and offers aliases for the
> old otg ones.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> drivers/usb/otg/otg.c | 18 ++++----
> include/linux/usb/otg.h | 96 ++++++++++++++++++++++++++++++++++++++--------
> 2 files changed, 88 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
> index c6f2bed..5fcc020 100644
> --- a/drivers/usb/otg/otg.c
> +++ b/drivers/usb/otg/otg.c
> @@ -17,7 +17,7 @@
> static struct usb_phy *xceiv;
>
> /**
> - * otg_get_transceiver - find the (single) OTG transceiver
> + * usb_get_transceiver - find the (single) OTG transceiver
> *
> * Returns the transceiver driver, after getting a refcount to it; or
> * null if there is no such transceiver. The caller is responsible for
> @@ -25,45 +25,45 @@ static struct usb_phy *xceiv;
> *
> * For use by USB host and peripheral drivers.
> */
> -struct usb_phy *otg_get_transceiver(void)
> +struct usb_phy *usb_get_transceiver(void)
> {
> if (xceiv)
> get_device(xceiv->dev);
> return xceiv;
> }
> -EXPORT_SYMBOL(otg_get_transceiver);
> +EXPORT_SYMBOL(usb_get_transceiver);
>
> /**
> - * otg_put_transceiver - release the (single) OTG transceiver
> + * usb_put_transceiver - release the (single) OTG transceiver
> * @x: the transceiver returned by otg_get_transceiver()
> *
> * Releases a refcount the caller received from otg_get_transceiver().
> *
> * For use by USB host and peripheral drivers.
> */
> -void otg_put_transceiver(struct usb_phy *x)
> +void usb_put_transceiver(struct usb_phy *x)
> {
> if (x)
> put_device(x->dev);
> }
> -EXPORT_SYMBOL(otg_put_transceiver);
> +EXPORT_SYMBOL(usb_put_transceiver);
>
> /**
> - * otg_set_transceiver - declare the (single) OTG transceiver
> + * usb_set_transceiver - declare the (single) OTG transceiver
> * @x: the USB OTG transceiver to be used; or NULL
> *
> * This call is exclusively for use by transceiver drivers, which
> * coordinate the activities of drivers for host and peripheral
> * controllers, and in some cases for VBUS current regulation.
> */
> -int otg_set_transceiver(struct usb_phy *x)
> +int usb_set_transceiver(struct usb_phy *x)
> {
> if (xceiv && x)
> return -EBUSY;
> xceiv = x;
> return 0;
> }
> -EXPORT_SYMBOL(otg_set_transceiver);
> +EXPORT_SYMBOL(usb_set_transceiver);
>
> const char *usb_phy_state_string(enum usb_phy_state state)
> {
> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> index 926e04c..34dea9b 100644
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -48,11 +48,36 @@ struct usb_phy;
> /* for transceivers connected thru an ULPI interface, the user must
> * provide access ops
> */
> -struct otg_io_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;
> +
> + struct usb_phy *xceiv;
_phy_ should be instead of _xceiv_. It's more self explanatory.

> + struct usb_bus *host;
> + struct usb_gadget *gadget;
> +
> + /* bind/unbind the host controller */
> + int (*set_host)(struct usb_otg *otg, struct usb_bus *host);
> +
> + /* bind/unbind the peripheral controller */
> + int (*set_peripheral)(struct usb_otg *otg,
> + struct usb_gadget *gadget);
> +
> + /* effective for A-peripheral, ignored for B devices */
> + int (*set_vbus)(struct usb_otg *otg, bool enabled);
> +
> + /* for B devices only: start session with A-Host */
> + int (*start_srp)(struct usb_otg *otg);
> +
> + /* start or continue HNP role switch */
> + int (*start_hnp)(struct usb_otg *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
> @@ -68,11 +93,13 @@ struct usb_phy {
> enum usb_phy_state state;
> enum usb_phy_events last_event;
>
> + struct usb_otg *otg;
> +
> struct usb_bus *host;
> struct usb_gadget *gadget;
>
> - struct otg_io_access_ops *io_ops;
> - void __iomem *io_priv;
> + struct usb_phy_io_ops *io_ops;
> + void __iomem *io_priv;
>
> /* for notification of usb_phy_events */
> struct atomic_notifier_head notifier;
> @@ -115,7 +142,7 @@ struct usb_phy {
>
>
> /* for board-specific init logic */
> -extern int otg_set_transceiver(struct usb_phy *);
> +extern int usb_set_transceiver(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 */
> @@ -132,7 +159,7 @@ static inline void usb_nop_xceiv_unregister(void)
> #endif
>
> /* helpers for direct access thru low-level io interface */
> -static inline int otg_io_read(struct usb_phy *x, u32 reg)
> +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);
> @@ -140,7 +167,7 @@ static inline int otg_io_read(struct usb_phy *x, u32 reg)
> return -EINVAL;
> }
>
> -static inline int otg_io_write(struct usb_phy *x, u32 val, u32 reg)
> +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);
> @@ -149,7 +176,7 @@ static inline int otg_io_write(struct usb_phy *x, u32 val, u32 reg)
> }
>
> static inline int
> -otg_init(struct usb_phy *x)
> +usb_phy_init(struct usb_phy *x)
> {
> if (x->init)
> return x->init(x);
> @@ -158,7 +185,7 @@ otg_init(struct usb_phy *x)
> }
>
> static inline void
> -otg_shutdown(struct usb_phy *x)
> +usb_phy_shutdown(struct usb_phy *x)
> {
> if (x->shutdown)
> x->shutdown(x);
> @@ -166,16 +193,16 @@ otg_shutdown(struct usb_phy *x)
>
> /* for usb host and peripheral controller drivers */
> #ifdef CONFIG_USB_OTG_UTILS
> -extern struct usb_phy *otg_get_transceiver(void);
> -extern void otg_put_transceiver(struct usb_phy *);
> +extern struct usb_phy *usb_get_transceiver(void);
> +extern void usb_put_transceiver(struct usb_phy *);
> extern const char *usb_phy_state_string(enum usb_phy_state state);
> #else
> -static inline struct usb_phy *otg_get_transceiver(void)
> +static inline struct usb_phy *usb_get_transceiver(void)
> {
> return NULL;
> }
>
> -static inline void otg_put_transceiver(struct usb_phy *x)
> +static inline void usb_put_transceiver(struct usb_phy *x)
> {
> }
>
> @@ -189,6 +216,9 @@ static inline const char *usb_phy_state_string(enum usb_phy_state state)
> static inline int
> otg_start_hnp(struct usb_phy *x)
> {
> + if (x->otg && x->otg->start_hnp)
> + return x->otg->start_hnp(x->otg);
> +
> return x->start_hnp(x);
> }
>
> @@ -196,6 +226,9 @@ otg_start_hnp(struct usb_phy *x)
> static inline int
> otg_set_vbus(struct usb_phy *x, bool enabled)
> {
> + if (x->otg && x->otg->set_vbus)
> + return x->otg->set_vbus(x->otg, enabled);
> +
> return x->set_vbus(x, enabled);
> }
>
> @@ -203,6 +236,9 @@ otg_set_vbus(struct usb_phy *x, bool enabled)
> static inline int
> otg_set_host(struct usb_phy *x, struct usb_bus *host)
> {
> + if (x->otg && x->otg->set_host)
> + return x->otg->set_host(x->otg, host);
> +
> return x->set_host(x, host);
> }
>
> @@ -212,18 +248,23 @@ otg_set_host(struct usb_phy *x, struct usb_bus *host)
> static inline int
> otg_set_peripheral(struct usb_phy *x, struct usb_gadget *periph)
> {
> + if (x->otg && x->otg->set_peripheral)
> + return x->otg->set_peripheral(x->otg, periph);
> +
> return x->set_peripheral(x, periph);
> }
>
> static inline int
> -otg_set_power(struct usb_phy *x, unsigned mA)
> +usb_phy_set_power(struct usb_phy *x, unsigned mA)
> {
> - return x->set_power(x, mA);
> + if (x && x->set_power)
> + return x->set_power(x, mA);
> + return 0;
> }
>
> /* Context: can sleep */
> static inline int
> -otg_set_suspend(struct usb_phy *x, int suspend)
> +usb_phy_set_suspend(struct usb_phy *x, int suspend)
> {
> if (x->set_suspend != NULL)
> return x->set_suspend(x, suspend);
> @@ -234,18 +275,21 @@ otg_set_suspend(struct usb_phy *x, int suspend)
> static inline int
> otg_start_srp(struct usb_phy *x)
> {
> + if (x->otg && x->otg->start_srp)
> + return x->otg->start_srp(x->otg);
> +
> return x->start_srp(x);
> }
>
> /* notifiers */
> static inline int
> -otg_register_notifier(struct usb_phy *x, struct notifier_block *nb)
> +usb_register_notifier(struct usb_phy *x, struct notifier_block *nb)
> {
> return atomic_notifier_chain_register(&x->notifier, nb);
> }
>
> static inline void
> -otg_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
> +usb_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
> {
> atomic_notifier_chain_unregister(&x->notifier, nb);
> }
> @@ -253,4 +297,22 @@ otg_unregister_notifier(struct usb_phy *x, struct notifier_block *nb)
> /* for OTG controller drivers (and maybe other stuff) */
> extern int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num);
>
> +/* Temporary aliases for transceiver functions */
> +#define otg_set_transceiver(x) usb_set_transceiver(x)
> +#define otg_get_transceiver() usb_get_transceiver()
> +#define otg_put_transceiver(x) usb_put_transceiver(x)
> +
> +#define otg_io_read(x, a) usb_phy_io_read(x, a)
> +#define otg_io_write(x, a, b) usb_phy_io_write(x, a, b)
> +
> +#define otg_init(x) usb_phy_init(x)
> +#define otg_shutdown(x) usb_phy_shutdown(x)
> +#define otg_set_power(x, a) usb_phy_set_power(x, a)
> +#define otg_set_suspend(x, a) usb_phy_set_suspend(x, a)
> +
> +#define otg_register_notifier(x, a) usb_register_notifier(x, a)
> +#define otg_unregister_notifier(x, a) usb_unregiser_notifier(x, a)
> +
> +#define otg_io_access_ops usb_phy_io_ops
> +
> #endif /* __LINUX_USB_OTG_H */
> --
> 1.7.4.1
>
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Next message: Lennart Poettering: "Re: [RFC PATCH] tmpfs: support user quotas"
Previous message: Ilya Zykov: "PROBLEM: Race condition in tty buffer's function flush_to_ldisc()."
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