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
Signed-off-by: Daniel Mack <daniel@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
---
include/linux/usb/otg.h | 60 ++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 59 insertions(+), 1 deletions(-)
diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 2443c0e..6b6cc8a 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -33,6 +33,16 @@ enum usb_otg_state {
OTG_STATE_A_VBUS_ERR,
};
+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
@@ -49,10 +59,17 @@ 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 +82,10 @@ 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 +106,38 @@ 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 +150,12 @@ 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 +164,6 @@ 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 */
--
1.6.3.3
--
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