Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
David Brownell | 955 | 48.97% | 2 | 9.52% |
Andrzej Pietrasiewicz | 718 | 36.82% | 4 | 19.05% |
Paul Zimmerman | 204 | 10.46% | 1 | 4.76% |
Tatyana Brokhman | 34 | 1.74% | 2 | 9.52% |
Sebastian Andrzej Siewior | 10 | 0.51% | 2 | 9.52% |
Wei Yongjun | 8 | 0.41% | 1 | 4.76% |
Harvey Harrison | 7 | 0.36% | 1 | 4.76% |
Christoph Hellwig | 4 | 0.21% | 1 | 4.76% |
Tejun Heo | 3 | 0.15% | 1 | 4.76% |
John Youn | 2 | 0.10% | 1 | 4.76% |
Greg Kroah-Hartman | 2 | 0.10% | 2 | 9.52% |
Bhumika Goyal | 1 | 0.05% | 1 | 4.76% |
Duan Jiong | 1 | 0.05% | 1 | 4.76% |
Robert Baldyga | 1 | 0.05% | 1 | 4.76% |
Total | 1950 | 21 |
// SPDX-License-Identifier: GPL-2.0+ /* * f_subset.c -- "CDC Subset" Ethernet link function driver * * Copyright (C) 2003-2005,2008 David Brownell * Copyright (C) 2008 Nokia Corporation */ #include <linux/slab.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/device.h> #include <linux/etherdevice.h> #include "u_ether.h" #include "u_ether_configfs.h" #include "u_gether.h" /* * This function packages a simple "CDC Subset" Ethernet port with no real * control mechanisms; just raw data transfer over two bulk endpoints. * The data transfer model is exactly that of CDC Ethernet, which is * why we call it the "CDC Subset". * * Because it's not standardized, this has some interoperability issues. * They mostly relate to driver binding, since the data transfer model is * so simple (CDC Ethernet). The original versions of this protocol used * specific product/vendor IDs: byteswapped IDs for Digital Equipment's * SA-1100 "Itsy" board, which could run Linux 2.4 kernels and supported * daughtercards with USB peripheral connectors. (It was used more often * with other boards, using the Itsy identifiers.) Linux hosts recognized * this with CONFIG_USB_ARMLINUX; these devices have only one configuration * and one interface. * * At some point, MCCI defined a (nonconformant) CDC MDLM variant called * "SAFE", which happens to have a mode which is identical to the "CDC * Subset" in terms of data transfer and lack of control model. This was * adopted by later Sharp Zaurus models, and by some other software which * Linux hosts recognize with CONFIG_USB_NET_ZAURUS. * * Because Microsoft's RNDIS drivers are far from robust, we added a few * descriptors to the CDC Subset code, making this code look like a SAFE * implementation. This lets you use MCCI's host side MS-Windows drivers * if you get fed up with RNDIS. It also makes it easier for composite * drivers to work, since they can use class based binding instead of * caring about specific product and vendor IDs. */ struct f_gether { struct gether port; char ethaddr[14]; }; static inline struct f_gether *func_to_geth(struct usb_function *f) { return container_of(f, struct f_gether, port.func); } /*-------------------------------------------------------------------------*/ /* * "Simple" CDC-subset option is a simple vendor-neutral model that most * full speed controllers can handle: one interface, two bulk endpoints. * To assist host side drivers, we fancy it up a bit, and add descriptors so * some host side drivers will understand it as a "SAFE" variant. * * "SAFE" loosely follows CDC WMC MDLM, violating the spec in various ways. * Data endpoints live in the control interface, there's no data interface. * And it's not used to talk to a cell phone radio. */ /* interface descriptor: */ static struct usb_interface_descriptor subset_data_intf = { .bLength = sizeof subset_data_intf, .bDescriptorType = USB_DT_INTERFACE, /* .bInterfaceNumber = DYNAMIC */ .bAlternateSetting = 0, .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_COMM, .bInterfaceSubClass = USB_CDC_SUBCLASS_MDLM, .bInterfaceProtocol = 0, /* .iInterface = DYNAMIC */ }; static struct usb_cdc_header_desc mdlm_header_desc = { .bLength = sizeof mdlm_header_desc, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_HEADER_TYPE, .bcdCDC = cpu_to_le16(0x0110), }; static struct usb_cdc_mdlm_desc mdlm_desc = { .bLength = sizeof mdlm_desc, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_MDLM_TYPE, .bcdVersion = cpu_to_le16(0x0100), .bGUID = { 0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6, 0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f, }, }; /* since "usb_cdc_mdlm_detail_desc" is a variable length structure, we * can't really use its struct. All we do here is say that we're using * the submode of "SAFE" which directly matches the CDC Subset. */ static u8 mdlm_detail_desc[] = { 6, USB_DT_CS_INTERFACE, USB_CDC_MDLM_DETAIL_TYPE, 0, /* "SAFE" */ 0, /* network control capabilities (none) */ 0, /* network data capabilities ("raw" encapsulation) */ }; static struct usb_cdc_ether_desc ether_desc = { .bLength = sizeof ether_desc, .bDescriptorType = USB_DT_CS_INTERFACE, .bDescriptorSubType = USB_CDC_ETHERNET_TYPE, /* this descriptor actually adds value, surprise! */ /* .iMACAddress = DYNAMIC */ .bmEthernetStatistics = cpu_to_le32(0), /* no statistics */ .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN), .wNumberMCFilters = cpu_to_le16(0), .bNumberPowerFilters = 0, }; /* full speed support: */ static struct usb_endpoint_descriptor fs_subset_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_IN, .bmAttributes = USB_ENDPOINT_XFER_BULK, }; static struct usb_endpoint_descriptor fs_subset_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bEndpointAddress = USB_DIR_OUT, .bmAttributes = USB_ENDPOINT_XFER_BULK, }; static struct usb_descriptor_header *fs_eth_function[] = { (struct usb_descriptor_header *) &subset_data_intf, (struct usb_descriptor_header *) &mdlm_header_desc, (struct usb_descriptor_header *) &mdlm_desc, (struct usb_descriptor_header *) &mdlm_detail_desc, (struct usb_descriptor_header *) ðer_desc, (struct usb_descriptor_header *) &fs_subset_in_desc, (struct usb_descriptor_header *) &fs_subset_out_desc, NULL, }; /* high speed support: */ static struct usb_endpoint_descriptor hs_subset_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), }; static struct usb_endpoint_descriptor hs_subset_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(512), }; static struct usb_descriptor_header *hs_eth_function[] = { (struct usb_descriptor_header *) &subset_data_intf, (struct usb_descriptor_header *) &mdlm_header_desc, (struct usb_descriptor_header *) &mdlm_desc, (struct usb_descriptor_header *) &mdlm_detail_desc, (struct usb_descriptor_header *) ðer_desc, (struct usb_descriptor_header *) &hs_subset_in_desc, (struct usb_descriptor_header *) &hs_subset_out_desc, NULL, }; /* super speed support: */ static struct usb_endpoint_descriptor ss_subset_in_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(1024), }; static struct usb_endpoint_descriptor ss_subset_out_desc = { .bLength = USB_DT_ENDPOINT_SIZE, .bDescriptorType = USB_DT_ENDPOINT, .bmAttributes = USB_ENDPOINT_XFER_BULK, .wMaxPacketSize = cpu_to_le16(1024), }; static struct usb_ss_ep_comp_descriptor ss_subset_bulk_comp_desc = { .bLength = sizeof ss_subset_bulk_comp_desc, .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, /* the following 2 values can be tweaked if necessary */ /* .bMaxBurst = 0, */ /* .bmAttributes = 0, */ }; static struct usb_descriptor_header *ss_eth_function[] = { (struct usb_descriptor_header *) &subset_data_intf, (struct usb_descriptor_header *) &mdlm_header_desc, (struct usb_descriptor_header *) &mdlm_desc, (struct usb_descriptor_header *) &mdlm_detail_desc, (struct usb_descriptor_header *) ðer_desc, (struct usb_descriptor_header *) &ss_subset_in_desc, (struct usb_descriptor_header *) &ss_subset_bulk_comp_desc, (struct usb_descriptor_header *) &ss_subset_out_desc, (struct usb_descriptor_header *) &ss_subset_bulk_comp_desc, NULL, }; /* string descriptors: */ static struct usb_string geth_string_defs[] = { [0].s = "CDC Ethernet Subset/SAFE", [1].s = "", { } /* end of list */ }; static struct usb_gadget_strings geth_string_table = { .language = 0x0409, /* en-us */ .strings = geth_string_defs, }; static struct usb_gadget_strings *geth_strings[] = { &geth_string_table, NULL, }; /*-------------------------------------------------------------------------*/ static int geth_set_alt(struct usb_function *f, unsigned intf, unsigned alt) { struct f_gether *geth = func_to_geth(f); struct usb_composite_dev *cdev = f->config->cdev; struct net_device *net; /* we know alt == 0, so this is an activation or a reset */ if (geth->port.in_ep->enabled) { DBG(cdev, "reset cdc subset\n"); gether_disconnect(&geth->port); } DBG(cdev, "init + activate cdc subset\n"); if (config_ep_by_speed(cdev->gadget, f, geth->port.in_ep) || config_ep_by_speed(cdev->gadget, f, geth->port.out_ep)) { geth->port.in_ep->desc = NULL; geth->port.out_ep->desc = NULL; return -EINVAL; } net = gether_connect(&geth->port); return PTR_ERR_OR_ZERO(net); } static void geth_disable(struct usb_function *f) { struct f_gether *geth = func_to_geth(f); struct usb_composite_dev *cdev = f->config->cdev; DBG(cdev, "net deactivated\n"); gether_disconnect(&geth->port); } /*-------------------------------------------------------------------------*/ /* serial function driver setup/binding */ static int geth_bind(struct usb_configuration *c, struct usb_function *f) { struct usb_composite_dev *cdev = c->cdev; struct f_gether *geth = func_to_geth(f); struct usb_string *us; int status; struct usb_ep *ep; struct f_gether_opts *gether_opts; gether_opts = container_of(f->fi, struct f_gether_opts, func_inst); /* * in drivers/usb/gadget/configfs.c:configfs_composite_bind() * configurations are bound in sequence with list_for_each_entry, * in each configuration its functions are bound in sequence * with list_for_each_entry, so we assume no race condition * with regard to gether_opts->bound access */ if (!gether_opts->bound) { mutex_lock(&gether_opts->lock); gether_set_gadget(gether_opts->net, cdev->gadget); status = gether_register_netdev(gether_opts->net); mutex_unlock(&gether_opts->lock); if (status) return status; gether_opts->bound = true; } us = usb_gstrings_attach(cdev, geth_strings, ARRAY_SIZE(geth_string_defs)); if (IS_ERR(us)) return PTR_ERR(us); subset_data_intf.iInterface = us[0].id; ether_desc.iMACAddress = us[1].id; /* allocate instance-specific interface IDs */ status = usb_interface_id(c, f); if (status < 0) goto fail; subset_data_intf.bInterfaceNumber = status; status = -ENODEV; /* allocate instance-specific endpoints */ ep = usb_ep_autoconfig(cdev->gadget, &fs_subset_in_desc); if (!ep) goto fail; geth->port.in_ep = ep; ep = usb_ep_autoconfig(cdev->gadget, &fs_subset_out_desc); if (!ep) goto fail; geth->port.out_ep = ep; /* support all relevant hardware speeds... we expect that when * hardware is dual speed, all bulk-capable endpoints work at * both speeds */ hs_subset_in_desc.bEndpointAddress = fs_subset_in_desc.bEndpointAddress; hs_subset_out_desc.bEndpointAddress = fs_subset_out_desc.bEndpointAddress; ss_subset_in_desc.bEndpointAddress = fs_subset_in_desc.bEndpointAddress; ss_subset_out_desc.bEndpointAddress = fs_subset_out_desc.bEndpointAddress; status = usb_assign_descriptors(f, fs_eth_function, hs_eth_function, ss_eth_function, NULL); if (status) goto fail; /* NOTE: all that is done without knowing or caring about * the network link ... which is unavailable to this code * until we're activated via set_alt(). */ DBG(cdev, "CDC Subset: %s speed IN/%s OUT/%s\n", gadget_is_superspeed(c->cdev->gadget) ? "super" : gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", geth->port.in_ep->name, geth->port.out_ep->name); return 0; fail: ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); return status; } static inline struct f_gether_opts *to_f_gether_opts(struct config_item *item) { return container_of(to_config_group(item), struct f_gether_opts, func_inst.group); } /* f_gether_item_ops */ USB_ETHERNET_CONFIGFS_ITEM(gether); /* f_gether_opts_dev_addr */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(gether); /* f_gether_opts_host_addr */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(gether); /* f_gether_opts_qmult */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(gether); /* f_gether_opts_ifname */ USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(gether); static struct configfs_attribute *gether_attrs[] = { &gether_opts_attr_dev_addr, &gether_opts_attr_host_addr, &gether_opts_attr_qmult, &gether_opts_attr_ifname, NULL, }; static const struct config_item_type gether_func_type = { .ct_item_ops = &gether_item_ops, .ct_attrs = gether_attrs, .ct_owner = THIS_MODULE, }; static void geth_free_inst(struct usb_function_instance *f) { struct f_gether_opts *opts; opts = container_of(f, struct f_gether_opts, func_inst); if (opts->bound) gether_cleanup(netdev_priv(opts->net)); else free_netdev(opts->net); kfree(opts); } static struct usb_function_instance *geth_alloc_inst(void) { struct f_gether_opts *opts; opts = kzalloc(sizeof(*opts), GFP_KERNEL); if (!opts) return ERR_PTR(-ENOMEM); mutex_init(&opts->lock); opts->func_inst.free_func_inst = geth_free_inst; opts->net = gether_setup_default(); if (IS_ERR(opts->net)) { struct net_device *net = opts->net; kfree(opts); return ERR_CAST(net); } config_group_init_type_name(&opts->func_inst.group, "", &gether_func_type); return &opts->func_inst; } static void geth_free(struct usb_function *f) { struct f_gether *eth; eth = func_to_geth(f); kfree(eth); } static void geth_unbind(struct usb_configuration *c, struct usb_function *f) { geth_string_defs[0].id = 0; usb_free_all_descriptors(f); } static struct usb_function *geth_alloc(struct usb_function_instance *fi) { struct f_gether *geth; struct f_gether_opts *opts; int status; /* allocate and initialize one new instance */ geth = kzalloc(sizeof(*geth), GFP_KERNEL); if (!geth) return ERR_PTR(-ENOMEM); opts = container_of(fi, struct f_gether_opts, func_inst); mutex_lock(&opts->lock); opts->refcnt++; /* export host's Ethernet address in CDC format */ status = gether_get_host_addr_cdc(opts->net, geth->ethaddr, sizeof(geth->ethaddr)); if (status < 12) { kfree(geth); mutex_unlock(&opts->lock); return ERR_PTR(-EINVAL); } geth_string_defs[1].s = geth->ethaddr; geth->port.ioport = netdev_priv(opts->net); mutex_unlock(&opts->lock); geth->port.cdc_filter = DEFAULT_FILTER; geth->port.func.name = "cdc_subset"; geth->port.func.bind = geth_bind; geth->port.func.unbind = geth_unbind; geth->port.func.set_alt = geth_set_alt; geth->port.func.disable = geth_disable; geth->port.func.free_func = geth_free; return &geth->port.func; } DECLARE_USB_FUNCTION_INIT(geth, geth_alloc_inst, geth_alloc); MODULE_LICENSE("GPL"); MODULE_AUTHOR("David Brownell");
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