| /* |
| * 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. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.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" |
| |
| /** |
| * usb_ep_autoconfig_ss() - choose an endpoint matching the ep |
| * descriptor and ep companion 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. |
| * @ep_comp: Endpoint companion descriptor, with the required |
| * number of streams. Will be modified when the chosen EP |
| * supports a different number of streams. |
| * |
| * This routine replaces the usb_ep_autoconfig when needed |
| * superspeed enhancments. If such enhancemnets are required, |
| * the FD should call usb_ep_autoconfig_ss directly and provide |
| * the additional ep_comp parameter. |
| * |
| * 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 and |
| * the bmAttribute field in the ep companion descriptor is |
| * updated with the assigned number of streams if it is |
| * different from the original value. To prevent the endpoint |
| * from being returned by a later autoconfig call, claim it by |
| * assigning ep->claimed to true. |
| * |
| * On failure, this returns a null endpoint descriptor. |
| */ |
| struct usb_ep *usb_ep_autoconfig_ss( |
| struct usb_gadget *gadget, |
| struct usb_endpoint_descriptor *desc, |
| struct usb_ss_ep_comp_descriptor *ep_comp |
| ) |
| { |
| struct usb_ep *ep; |
| u8 type; |
| |
| type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; |
| |
| if (gadget->ops->match_ep) { |
| ep = gadget->ops->match_ep(gadget, desc, ep_comp); |
| if (ep) |
| goto found_ep; |
| } |
| |
| /* First, apply chip-specific "best usage" knowledge. |
| * This might make a good usb_gadget_ops hook ... |
| */ |
| if (gadget_is_goku(gadget)) { |
| if (USB_ENDPOINT_XFER_INT == type) { |
| /* single buffering is enough */ |
| ep = gadget_find_ep_by_name(gadget, "ep3-bulk"); |
| if (ep && usb_gadget_ep_match_desc(gadget, |
| ep, desc, ep_comp)) |
| goto found_ep; |
| } else if (USB_ENDPOINT_XFER_BULK == type |
| && (USB_DIR_IN & desc->bEndpointAddress)) { |
| /* DMA may be available */ |
| ep = gadget_find_ep_by_name(gadget, "ep2-bulk"); |
| if (ep && usb_gadget_ep_match_desc(gadget, |
| ep, desc, ep_comp)) |
| goto found_ep; |
| } |
| |
| #ifdef CONFIG_BLACKFIN |
| } else if (gadget_is_musbhdrc(gadget)) { |
| if ((USB_ENDPOINT_XFER_BULK == type) || |
| (USB_ENDPOINT_XFER_ISOC == type)) { |
| if (USB_DIR_IN & desc->bEndpointAddress) |
| ep = gadget_find_ep_by_name(gadget, "ep5in"); |
| else |
| ep = gadget_find_ep_by_name(gadget, "ep6out"); |
| } else if (USB_ENDPOINT_XFER_INT == type) { |
| if (USB_DIR_IN & desc->bEndpointAddress) |
| ep = gadget_find_ep_by_name(gadget, "ep1in"); |
| else |
| ep = gadget_find_ep_by_name(gadget, "ep2out"); |
| } else |
| ep = NULL; |
| if (ep && usb_gadget_ep_match_desc(gadget, ep, desc, ep_comp)) |
| goto found_ep; |
| #endif |
| } |
| |
| /* Second, look at endpoints until an unclaimed one looks usable */ |
| list_for_each_entry (ep, &gadget->ep_list, ep_list) { |
| if (usb_gadget_ep_match_desc(gadget, ep, desc, ep_comp)) |
| goto found_ep; |
| } |
| |
| /* Fail */ |
| return NULL; |
| found_ep: |
| |
| /* |
| * If the protocol driver hasn't yet decided on wMaxPacketSize |
| * and wants to know the maximum possible, provide the info. |
| */ |
| if (desc->wMaxPacketSize == 0) |
| desc->wMaxPacketSize = cpu_to_le16(ep->maxpacket_limit); |
| |
| /* report address */ |
| desc->bEndpointAddress &= USB_DIR_IN; |
| if (isdigit(ep->name[2])) { |
| u8 num = simple_strtoul(&ep->name[2], NULL, 10); |
| desc->bEndpointAddress |= num; |
| } else if (desc->bEndpointAddress & USB_DIR_IN) { |
| if (++gadget->in_epnum > 15) |
| return NULL; |
| desc->bEndpointAddress = USB_DIR_IN | gadget->in_epnum; |
| } else { |
| if (++gadget->out_epnum > 15) |
| return NULL; |
| desc->bEndpointAddress |= gadget->out_epnum; |
| } |
| |
| /* report (variable) full speed bulk maxpacket */ |
| if ((type == USB_ENDPOINT_XFER_BULK) && !ep_comp) { |
| int size = ep->maxpacket_limit; |
| |
| /* min() doesn't work on bitfields with gcc-3.5 */ |
| if (size > 64) |
| size = 64; |
| desc->wMaxPacketSize = cpu_to_le16(size); |
| } |
| |
| ep->address = desc->bEndpointAddress; |
| ep->desc = NULL; |
| ep->comp_desc = NULL; |
| ep->claimed = true; |
| return ep; |
| } |
| EXPORT_SYMBOL_GPL(usb_ep_autoconfig_ss); |
| |
| /** |
| * 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->claimed to true. |
| * |
| * On failure, this returns a null endpoint descriptor. |
| */ |
| struct usb_ep *usb_ep_autoconfig( |
| struct usb_gadget *gadget, |
| struct usb_endpoint_descriptor *desc |
| ) |
| { |
| return usb_ep_autoconfig_ss(gadget, desc, NULL); |
| } |
| EXPORT_SYMBOL_GPL(usb_ep_autoconfig); |
| |
| /** |
| * 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->claimed and the record of assigned endpoints |
| * used by usb_ep_autoconfig(). |
| */ |
| void usb_ep_autoconfig_reset (struct usb_gadget *gadget) |
| { |
| struct usb_ep *ep; |
| |
| list_for_each_entry (ep, &gadget->ep_list, ep_list) { |
| ep->claimed = false; |
| } |
| gadget->in_epnum = 0; |
| gadget->out_epnum = 0; |
| } |
| EXPORT_SYMBOL_GPL(usb_ep_autoconfig_reset); |