/* * hid.c -- HID Composite driver * * Based on multi.c * * Copyright (C) 2010 Fabien Chouteau * * 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 #include #include #include #include #include #define DRIVER_DESC "HID Gadget" #define DRIVER_VERSION "2010/03/16" #include "u_hid.h" /*-------------------------------------------------------------------------*/ #define HIDG_VENDOR_NUM 0x0525 /* XXX NetChip */ #define HIDG_PRODUCT_NUM 0xa4ac /* Linux-USB HID gadget */ /*-------------------------------------------------------------------------*/ struct hidg_func_node { struct usb_function_instance *fi; struct usb_function *f; struct list_head node; struct hidg_func_descriptor *func; }; static LIST_HEAD(hidg_func_list); /*-------------------------------------------------------------------------*/ USB_GADGET_COMPOSITE_OPTIONS(); static struct usb_device_descriptor device_desc = { .bLength = sizeof device_desc, .bDescriptorType = USB_DT_DEVICE, /* .bcdUSB = DYNAMIC */ /* .bDeviceClass = USB_CLASS_COMM, */ /* .bDeviceSubClass = 0, */ /* .bDeviceProtocol = 0, */ .bDeviceClass = USB_CLASS_PER_INTERFACE, .bDeviceSubClass = 0, .bDeviceProtocol = 0, /* .bMaxPacketSize0 = f(hardware) */ /* Vendor and product id can be overridden by module parameters. */ .idVendor = cpu_to_le16(HIDG_VENDOR_NUM), .idProduct = cpu_to_le16(HIDG_PRODUCT_NUM), /* .bcdDevice = f(hardware) */ /* .iManufacturer = DYNAMIC */ /* .iProduct = DYNAMIC */ /* NO SERIAL NUMBER */ .bNumConfigurations = 1, }; static const struct usb_descriptor_header *otg_desc[2]; /* string IDs are assigned dynamically */ static struct usb_string strings_dev[] = { [USB_GADGET_MANUFACTURER_IDX].s = "", [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC, [USB_GADGET_SERIAL_IDX].s = "", { } /* end of list */ }; static struct usb_gadget_strings stringtab_dev = { .language = 0x0409, /* en-us */ .strings = strings_dev, }; static struct usb_gadget_strings *dev_strings[] = { &stringtab_dev, NULL, }; /****************************** Configurations ******************************/ static int do_config(struct usb_configuration *c) { struct hidg_func_node *e, *n; int status = 0; if (gadget_is_otg(c->cdev->gadget)) { c->descriptors = otg_desc; c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; } list_for_each_entry(e, &hidg_func_list, node) { e->f = usb_get_function(e->fi); if (IS_ERR(e->f)) goto put; status = usb_add_function(c, e->f); if (status < 0) { usb_put_function(e->f); goto put; } } return 0; put: list_for_each_entry(n, &hidg_func_list, node) { if (n == e) break; usb_remove_function(c, n->f); usb_put_function(n->f); } return status; } static struct usb_configuration config_driver = { .label = "HID Gadget", .bConfigurationValue = 1, /* .iConfiguration = DYNAMIC */ .bmAttributes = USB_CONFIG_ATT_SELFPOWER, }; /****************************** Gadget Bind ******************************/ static int hid_bind(struct usb_composite_dev *cdev) { struct usb_gadget *gadget = cdev->gadget; struct list_head *tmp; struct hidg_func_node *n, *m; struct f_hid_opts *hid_opts; int status, funcs = 0; list_for_each(tmp, &hidg_func_list) funcs++; if (!funcs) return -ENODEV; list_for_each_entry(n, &hidg_func_list, node) { n->fi = usb_get_function_instance("hid"); if (IS_ERR(n->fi)) { status = PTR_ERR(n->fi); goto put; } hid_opts = container_of(n->fi, struct f_hid_opts, func_inst); hid_opts->subclass = n->func->subclass; hid_opts->protocol = n->func->protocol; hid_opts->report_length = n->func->report_length; hid_opts->report_desc_length = n->func->report_desc_length; hid_opts->report_desc = n->func->report_desc; } /* Allocate string descriptor numbers ... note that string * contents can be overridden by the composite_dev glue. */ status = usb_string_ids_tab(cdev, strings_dev); if (status < 0) goto put; device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id; device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id; if (gadget_is_otg(gadget) && !otg_desc[0]) { struct usb_descriptor_header *usb_desc; usb_desc = usb_otg_descriptor_alloc(gadget); if (!usb_desc) { status = -ENOMEM; goto put; } usb_otg_descriptor_init(gadget, usb_desc); otg_desc[0] = usb_desc; otg_desc[1] = NULL; } /* register our configuration */ status = usb_add_config(cdev, &config_driver, do_config); if (status < 0) goto free_otg_desc; usb_composite_overwrite_options(cdev, &coverwrite); dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n"); return 0; free_otg_desc: kfree(otg_desc[0]); otg_desc[0] = NULL; put: list_for_each_entry(m, &hidg_func_list, node) { if (m == n) break; usb_put_function_instance(m->fi); } return status; } static int hid_unbind(struct usb_composite_dev *cdev) { struct hidg_func_node *n; list_for_each_entry(n, &hidg_func_list, node) { usb_put_function(n->f); usb_put_function_instance(n->fi); } kfree(otg_desc[0]); otg_desc[0] = NULL; return 0; } static int hidg_plat_driver_probe(struct platform_device *pdev) { struct hidg_func_descriptor *func = dev_get_platdata(&pdev->dev); struct hidg_func_node *entry; if (!func) { dev_err(&pdev->dev, "Platform data missing\n"); return -ENODEV; } entry = kzalloc(sizeof(*entry), GFP_KERNEL); if (!entry) return -ENOMEM; entry->func = func; list_add_tail(&entry->node, &hidg_func_list); return 0; } static int hidg_plat_driver_remove(struct platform_device *pdev) { struct hidg_func_node *e, *n; list_for_each_entry_safe(e, n, &hidg_func_list, node) { list_del(&e->node); kfree(e); } return 0; } /****************************** Some noise ******************************/ static struct usb_composite_driver hidg_driver = { .name = "g_hid", .dev = &device_desc, .strings = dev_strings, .max_speed = USB_SPEED_HIGH, .bind = hid_bind, .unbind = hid_unbind, }; static struct platform_driver hidg_plat_driver = { .remove = hidg_plat_driver_remove, .driver = { .name = "hidg", }, }; MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard"); MODULE_LICENSE("GPL"); static int __init hidg_init(void) { int status; status = platform_driver_probe(&hidg_plat_driver, hidg_plat_driver_probe); if (status < 0) return status; status = usb_composite_probe(&hidg_driver); if (status < 0) platform_driver_unregister(&hidg_plat_driver); return status; } module_init(hidg_init); static void __exit hidg_cleanup(void) { usb_composite_unregister(&hidg_driver); platform_driver_unregister(&hidg_plat_driver); } module_exit(hidg_cleanup);