Maemo patchset 20101501+0m5

[h-e-n] / drivers / usb / otg / otg.c

diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
new file mode 100644 (file)
index 0000000..f928b0b
--- /dev/null
+++ b/drivers/usb/otg/otg.c
@@ -0,0 +1,172 @@
+/*
+ * 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/mod_devicetable.h>
+#include <linux/byteorder/generic.h>
+#include <linux/gfp.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+
+#include "../core/otg_whitelist.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);
+
+#ifdef CONFIG_USB_OTG_WHITELIST
+
+/*
+ * This OTG Whitelist is the OTG "Targeted Peripheral List".  It should
+ * mostly use of USB_DEVICE() or USB_DEVICE_VER() entries..
+ *
+ * YOU _SHOULD_ CHANGE THIS LIST TO MATCH YOUR PRODUCT AND ITS TESTING!
+ */
+
+static struct usb_device_id whitelist_table[] = {
+
+/* hubs are optional in OTG, but very handy ... */
+{ USB_DEVICE_INFO(USB_CLASS_HUB, 0, 0), },
+{ USB_DEVICE_INFO(USB_CLASS_HUB, 0, 1), },
+
+#ifdef CONFIG_USB_PRINTER              /* ignoring nonstatic linkage! */
+/* FIXME actually, printers are NOT supposed to use device classes;
+ * they're supposed to use interface classes...
+ */
+{ USB_DEVICE_INFO(7, 1, 1) },
+{ USB_DEVICE_INFO(7, 1, 2) },
+{ USB_DEVICE_INFO(7, 1, 3) },
+#endif
+
+#ifdef CONFIG_USB_NET_CDCETHER
+/* Linux-USB CDC Ethernet gadget */
+{ USB_DEVICE(0x0525, 0xa4a1), },
+/* Linux-USB CDC Ethernet + RNDIS gadget */
+{ USB_DEVICE(0x0525, 0xa4a2), },
+#endif
+
+#if    defined(CONFIG_USB_TEST) || defined(CONFIG_USB_TEST_MODULE)
+/* gadget zero, for testing */
+{ USB_DEVICE(0x0525, 0xa4a0), },
+#endif
+
+{ }    /* Terminating entry */
+};
+
+int is_targeted(struct usb_device *dev)
+{
+       struct usb_device_id    *id = whitelist_table;
+
+       /* possible in developer configs only! */
+       if (!dev->bus->otg_port)
+               return 1;
+
+       /* HNP test device is _never_ targeted (see OTG spec 6.6.6) */
+       if ((le16_to_cpu(dev->descriptor.idVendor) == 0x1a0a &&
+            le16_to_cpu(dev->descriptor.idProduct) == 0xbadd))
+               return 0;
+
+       /* NOTE: can't use usb_match_id() since interface caches
+        * aren't set up yet. this is cut/paste from that code.
+        */
+       for (id = whitelist_table; id->match_flags; id++) {
+               if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
+                   id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
+                       continue;
+
+               if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
+                   id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
+                       continue;
+
+               /* No need to test id->bcdDevice_lo != 0, since 0 is never
+                  greater than any unsigned number. */
+               if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
+                   (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice)))
+                       continue;
+
+               if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
+                   (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice)))
+                       continue;
+
+               if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
+                   (id->bDeviceClass != dev->descriptor.bDeviceClass))
+                       continue;
+
+               if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
+                   (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass))
+                       continue;
+
+               if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
+                   (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
+                       continue;
+
+               return 1;
+       }
+
+       /* add other match criteria here ... */
+
+
+       /* OTG MESSAGE: report errors here, customize to match your product */
+       dev_err(&dev->dev, "device v%04x p%04x is not supported\n",
+               le16_to_cpu(dev->descriptor.idVendor),
+               le16_to_cpu(dev->descriptor.idProduct));
+
+       return 0;
+}
+
+#endif /* CONFIG_USB_OTG_WHITELIST */