Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 310 insertions, 0 deletions

diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
new file mode 100644
index 000000000000..f7c6d758e1b0
--- /dev/null
+++ b/drivers/usb/gadget/epautoconf.c
@@ -0,0 +1,310 @@
+/*
+ * epautoconf.c -- endpoint autoconfiguration for usb gadget drivers
+ *
+ * Copyright (C) 2004 David Brownell
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/device.h>
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+
+#include <linux/usb_ch9.h>
+#include <linux/usb_gadget.h>
+
+#include "gadget_chips.h"
+
+
+/* we must assign addresses for configurable endpoints (like net2280) */
+static __initdata unsigned epnum;
+
+// #define MANY_ENDPOINTS
+#ifdef MANY_ENDPOINTS
+/* more than 15 configurable endpoints */
+static __initdata unsigned in_epnum;
+#endif
+
+
+/*
+ * This should work with endpoints from controller drivers sharing the
+ * same endpoint naming convention.  By example:
+ *
+ *      - ep1, ep2, ... address is fixed, not direction or type
+ *      - ep1in, ep2out, ... address and direction are fixed, not type
+ *      - ep1-bulk, ep2-bulk, ... address and type are fixed, not direction
+ *      - ep1in-bulk, ep2out-iso, ... all three are fixed
+ *      - ep-* ... no functionality restrictions
+ *
+ * Type suffixes are "-bulk", "-iso", or "-int".  Numbers are decimal.
+ * Less common restrictions are implied by gadget_is_*().
+ *
+ * NOTE:  each endpoint is unidirectional, as specified by its USB
+ * descriptor; and isn't specific to a configuration or altsetting.
+ */
+static int __init
+ep_matches (
+        struct usb_gadget               *gadget,
+        struct usb_ep                   *ep,
+        struct usb_endpoint_descriptor  *desc
+)
+{
+        u8              type;
+        const char      *tmp;
+        u16             max;
+
+        /* endpoint already claimed? */
+        if (0 != ep->driver_data)
+                return 0;
+                
+        /* only support ep0 for portable CONTROL traffic */
+        type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+        if (USB_ENDPOINT_XFER_CONTROL == type)
+                return 0;
+
+        /* some other naming convention */
+        if ('e' != ep->name[0])
+                return 0;
+
+        /* type-restriction:  "-iso", "-bulk", or "-int".
+         * direction-restriction:  "in", "out".
+         */
+        if ('-' != ep->name[2]) {
+                tmp = strrchr (ep->name, '-');
+                if (tmp) {
+                        switch (type) {
+                        case USB_ENDPOINT_XFER_INT:
+                                /* bulk endpoints handle interrupt transfers,
+                                 * except the toggle-quirky iso-synch kind
+                                 */
+                                if ('s' == tmp[2])      // == "-iso"
+                                        return 0;
+                                /* for now, avoid PXA "interrupt-in";
+                                 * it's documented as never using DATA1.
+                                 */
+                                if (gadget_is_pxa (gadget)
+                                                && 'i' == tmp [1])
+                                        return 0;
+                                break;
+                        case USB_ENDPOINT_XFER_BULK:
+                                if ('b' != tmp[1])      // != "-bulk"
+                                        return 0;
+                                break;
+                        case USB_ENDPOINT_XFER_ISOC:
+                                if ('s' != tmp[2])      // != "-iso"
+                                        return 0;
+                        }
+                } else {
+                        tmp = ep->name + strlen (ep->name);
+                }
+
+                /* direction-restriction:  "..in-..", "out-.." */
+                tmp--;
+                if (!isdigit (*tmp)) {
+                        if (desc->bEndpointAddress & USB_DIR_IN) {
+                                if ('n' != *tmp)
+                                        return 0;
+                        } else {
+                                if ('t' != *tmp)
+                                        return 0;
+                        }
+                }
+        }
+
+        /* endpoint maxpacket size is an input parameter, except for bulk
+         * where it's an output parameter representing the full speed limit.
+         * the usb spec fixes high speed bulk maxpacket at 512 bytes.
+         */
+        max = 0x7ff & le16_to_cpup (&desc->wMaxPacketSize);
+        switch (type) {
+        case USB_ENDPOINT_XFER_INT:
+                /* INT:  limit 64 bytes full speed, 1024 high speed */
+                if (!gadget->is_dualspeed && max > 64)
+                        return 0;
+                /* FALLTHROUGH */
+
+        case USB_ENDPOINT_XFER_ISOC:
+                /* ISO:  limit 1023 bytes full speed, 1024 high speed */
+                if (ep->maxpacket < max)
+                        return 0;
+                if (!gadget->is_dualspeed && max > 1023)
+                        return 0;
+
+                /* BOTH:  "high bandwidth" works only at high speed */
+                if ((desc->wMaxPacketSize & __constant_cpu_to_le16(3<<11))) {
+                        if (!gadget->is_dualspeed)
+                                return 0;
+                        /* configure your hardware with enough buffering!! */
+                }
+                break;
+        }
+
+        /* MATCH!! */
+
+        /* report address */
+        if (isdigit (ep->name [2])) {
+                u8      num = simple_strtol (&ep->name [2], NULL, 10);
+                desc->bEndpointAddress |= num;
+#ifdef  MANY_ENDPOINTS
+        } else if (desc->bEndpointAddress & USB_DIR_IN) {
+                if (++in_epnum > 15)
+                        return 0;
+                desc->bEndpointAddress = USB_DIR_IN | in_epnum;
+#endif
+        } else {
+                if (++epnum > 15)
+                        return 0;
+                desc->bEndpointAddress |= epnum;
+        }
+
+        /* report (variable) full speed bulk maxpacket */
+        if (USB_ENDPOINT_XFER_BULK == type) {
+                int size = ep->maxpacket;
+
+                /* min() doesn't work on bitfields with gcc-3.5 */
+                if (size > 64)
+                        size = 64;
+                desc->wMaxPacketSize = cpu_to_le16(size);
+        }
+        return 1;
+}
+
+static struct usb_ep * __init
+find_ep (struct usb_gadget *gadget, const char *name)
+{
+        struct usb_ep   *ep;
+
+        list_for_each_entry (ep, &gadget->ep_list, ep_list) {
+                if (0 == strcmp (ep->name, name))
+                        return ep;
+        }
+        return NULL;
+}
+
+/**
+ * usb_ep_autoconfig - choose an endpoint matching the descriptor
+ * @gadget: The device to which the endpoint must belong.
+ * @desc: Endpoint descriptor, with endpoint direction and transfer mode
+ *      initialized.  For periodic transfers, the maximum packet
+ *      size must also be initialized.  This is modified on success.
+ *
+ * By choosing an endpoint to use with the specified descriptor, this
+ * routine simplifies writing gadget drivers that work with multiple
+ * USB device controllers.  The endpoint would be passed later to
+ * usb_ep_enable(), along with some descriptor.
+ *
+ * That second descriptor won't always be the same as the first one.
+ * For example, isochronous endpoints can be autoconfigured for high
+ * bandwidth, and then used in several lower bandwidth altsettings.
+ * Also, high and full speed descriptors will be different.
+ *
+ * Be sure to examine and test the results of autoconfiguration on your
+ * hardware.  This code may not make the best choices about how to use the
+ * USB controller, and it can't know all the restrictions that may apply.
+ * Some combinations of driver and hardware won't be able to autoconfigure.
+ *
+ * On success, this returns an un-claimed usb_ep, and modifies the endpoint
+ * descriptor bEndpointAddress.  For bulk endpoints, the wMaxPacket value
+ * is initialized as if the endpoint were used at full speed.  To prevent
+ * the endpoint from being returned by a later autoconfig call, claim it
+ * by assigning ep->driver_data to some non-null value.
+ *
+ * On failure, this returns a null endpoint descriptor.
+ */
+struct usb_ep * __init usb_ep_autoconfig (
+        struct usb_gadget               *gadget,
+        struct usb_endpoint_descriptor  *desc
+)
+{
+        struct usb_ep   *ep;
+        u8              type;
+
+        type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+        /* First, apply chip-specific "best usage" knowledge.
+         * This might make a good usb_gadget_ops hook ...
+         */
+        if (gadget_is_net2280 (gadget) && type == USB_ENDPOINT_XFER_INT) {
+                /* ep-e, ep-f are PIO with only 64 byte fifos */
+                ep = find_ep (gadget, "ep-e");
+                if (ep && ep_matches (gadget, ep, desc))
+                        return ep;
+                ep = find_ep (gadget, "ep-f");
+                if (ep && ep_matches (gadget, ep, desc))
+                        return ep;
+
+        } else if (gadget_is_goku (gadget)) {
+                if (USB_ENDPOINT_XFER_INT == type) {
+                        /* single buffering is enough */
+                        ep = find_ep (gadget, "ep3-bulk");
+                        if (ep && ep_matches (gadget, ep, desc))
+                                return ep;
+                } else if (USB_ENDPOINT_XFER_BULK == type
+                                && (USB_DIR_IN & desc->bEndpointAddress)) {
+                        /* DMA may be available */
+                        ep = find_ep (gadget, "ep2-bulk");
+                        if (ep && ep_matches (gadget, ep, desc))
+                                return ep;
+                }
+
+        } else if (gadget_is_sh (gadget) && USB_ENDPOINT_XFER_INT == type) {
+                /* single buffering is enough; maybe 8 byte fifo is too */
+                ep = find_ep (gadget, "ep3in-bulk");
+                if (ep && ep_matches (gadget, ep, desc))
+                        return ep;
+
+        } else if (gadget_is_mq11xx (gadget) && USB_ENDPOINT_XFER_INT == type) {
+                ep = find_ep (gadget, "ep1-bulk");
+                if (ep && ep_matches (gadget, ep, desc))
+                        return ep;
+        }
+
+        /* Second, look at endpoints until an unclaimed one looks usable */ 
+        list_for_each_entry (ep, &gadget->ep_list, ep_list) {
+                if (ep_matches (gadget, ep, desc))
+                        return ep;
+        }
+
+        /* Fail */
+        return NULL;
+}
+
+/**
+ * usb_ep_autoconfig_reset - reset endpoint autoconfig state
+ * @gadget: device for which autoconfig state will be reset
+ *
+ * Use this for devices where one configuration may need to assign
+ * endpoint resources very differently from the next one.  It clears
+ * state such as ep->driver_data and the record of assigned endpoints
+ * used by usb_ep_autoconfig().
+ */
+void __init usb_ep_autoconfig_reset (struct usb_gadget *gadget)
+{
+        struct usb_ep   *ep;
+
+        list_for_each_entry (ep, &gadget->ep_list, ep_list) {
+                ep->driver_data = NULL;
+        }
+#ifdef  MANY_ENDPOINTS
+        in_epnum = 0;
+#endif
+        epnum = 0;
+}
+