diff options
| author | Tony Lindgren <tony@atomide.com> | 2008-11-24 12:02:21 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-01-07 10:00:03 -0800 |
| commit | 3cb22d658668234edbe6dcb165501e9ef0c0a059 (patch) | |
| tree | f242d930ce9fce671ee71132e2a7a5f461d93514 /drivers | |
| parent | 68144e0cc92125f41157ede7b060f83367bc4fe7 (diff) | |
| download | linux-3cb22d658668234edbe6dcb165501e9ef0c0a059.tar.bz2 | |
USB: otg: sharable otg transceiver ops
Move otg_get/set/put_transceiver() from omap specific code
to common otg.c so other upcoming drivers can share them.
[ dbrownell@users.sourceforge.net: move to drivers/usb/otg, dox ]
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <me@felipebalbi.com>
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/otg/Makefile | 11 | ||||
| -rw-r--r-- | drivers/usb/otg/otg.c | 65 |
2 files changed, 71 insertions, 5 deletions
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile index 6c58b36ca7cf..7c80fc379e6a 100644 --- a/drivers/usb/otg/Makefile +++ b/drivers/usb/otg/Makefile @@ -2,12 +2,13 @@ # OTG infrastructure and transceiver drivers # +# infrastructure +obj-$(CONFIG_USB_OTG_UTILS) += otg.o + +# transceiver drivers obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o -ifeq ($(CONFIG_USB_DEBUG),y) -EXTRA_CFLAGS += -DDEBUG -else ifeq ($(CONFIG_USB_GADGET_DEBUG),y) -EXTRA_CFLAGS += -DDEBUG -endif +ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG +ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c new file mode 100644 index 000000000000..ff318fae7d4d --- /dev/null +++ b/drivers/usb/otg/otg.c @@ -0,0 +1,65 @@ +/* + * otg.c -- USB OTG utility code + * + * Copyright (C) 2004 Texas Instruments + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/device.h> + +#include <linux/usb/otg.h> + +static struct otg_transceiver *xceiv; + +/** + * otg_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 + * calling otg_put_transceiver() to release that count. + * + * For use by USB host and peripheral drivers. + */ +struct otg_transceiver *otg_get_transceiver(void) +{ + if (xceiv) + get_device(xceiv->dev); + return xceiv; +} +EXPORT_SYMBOL(otg_get_transceiver); + +/** + * otg_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 otg_transceiver *x) +{ + put_device(x->dev); +} +EXPORT_SYMBOL(otg_put_transceiver); + +/** + * otg_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 otg_transceiver *x) +{ + if (xceiv && x) + return -EBUSY; + xceiv = x; + return 0; +} +EXPORT_SYMBOL(otg_set_transceiver); |