diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-07 15:37:24 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-07 15:37:24 -0800 |
commit | 7c7758f99d39d529a64d4f60d22129bbf2f16d74 (patch) | |
tree | 8847b5e56812fe4c4c812cfffc78e391a91f4ebe /drivers/usb/otg/otg.c | |
parent | 67acd8b4b7a3f1b183ae358e1dfdb8a80e170736 (diff) | |
parent | 8a70da82edc50aa7a4b54864babf2d72538ba1bb (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (123 commits)
wimax/i2400m: add CREDITS and MAINTAINERS entries
wimax: export linux/wimax.h and linux/wimax/i2400m.h with headers_install
i2400m: Makefile and Kconfig
i2400m/SDIO: TX and RX path backends
i2400m/SDIO: firmware upload backend
i2400m/SDIO: probe/disconnect, dev init/shutdown and reset backends
i2400m/SDIO: header for the SDIO subdriver
i2400m/USB: TX and RX path backends
i2400m/USB: firmware upload backend
i2400m/USB: probe/disconnect, dev init/shutdown and reset backends
i2400m/USB: header for the USB bus driver
i2400m: debugfs controls
i2400m: various functions for device management
i2400m: RX and TX data/control paths
i2400m: firmware loading and bootrom initialization
i2400m: linkage to the networking stack
i2400m: Generic probe/disconnect, reset and message passing
i2400m: host/device procotol and core driver definitions
i2400m: documentation and instructions for usage
wimax: Makefile, Kconfig and docbook linkage for the stack
...
Diffstat (limited to 'drivers/usb/otg/otg.c')
-rw-r--r-- | drivers/usb/otg/otg.c | 65 |
1 files changed, 65 insertions, 0 deletions
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); |