/* * hid.c -- HID Composite driver * * Based on multi.c * * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com> * * 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/platform_device.h> #include <linux/list.h> #define DRIVER_DESC "HID Gadget" #define DRIVER_VERSION "2010/03/16" /*-------------------------------------------------------------------------*/ #define HIDG_VENDOR_NUM 0x0525 /* XXX NetChip */ #define HIDG_PRODUCT_NUM 0xa4ac /* Linux-USB HID gadget */ /*-------------------------------------------------------------------------*/ /* * kbuild is not very cooperative with respect to linking separately * compiled library objects into one module. So for now we won't use * separate compilation ... ensuring init/exit sections work to shrink * the runtime footprint, and giving us at least some parts of what * a "gcc --combine ... part1.c part2.c part3.c ... " build would. */ #include "composite.c" #include "usbstring.c" #include "config.c" #include "epautoconf.c" #include "f_hid.c" struct hidg_func_node { struct list_head node; struct hidg_func_descriptor *func; }; static LIST_HEAD(hidg_func_list); /*-------------------------------------------------------------------------*/ static struct usb_device_descriptor device_desc = { .bLength = sizeof device_desc, .bDescriptorType = USB_DT_DEVICE, .bcdUSB = cpu_to_le16(0x0200), /* .bDeviceClass = USB_CLASS_COMM, */ /* .bDeviceSubClass = 0, */ /* .bDeviceProtocol = 0, */ .bDeviceClass = 0xEF, .bDeviceSubClass = 2, .bDeviceProtocol = 1, /* .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 struct usb_otg_descriptor otg_descriptor = { .bLength = sizeof otg_descriptor, .bDescriptorType = USB_DT_OTG, /* REVISIT SRP-only hardware is possible, although * it would not be called "OTG" ... */ .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, }; static const struct usb_descriptor_header *otg_desc[] = { (struct usb_descriptor_header *) &otg_descriptor, NULL, }; /* string IDs are assigned dynamically */ #define STRING_MANUFACTURER_IDX 0 #define STRING_PRODUCT_IDX 1 static char manufacturer[50]; static struct usb_string strings_dev[] = { [STRING_MANUFACTURER_IDX].s = manufacturer, [STRING_PRODUCT_IDX].s = DRIVER_DESC, { } /* 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 __init do_config(struct usb_configuration *c) { struct hidg_func_node *e; int func = 0, 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) { status = hidg_bind_config(c, e->func, func++); if (status) break; } return status; } static struct usb_configuration config_driver = { .label = "HID Gadget", .bConfigurationValue = 1, /* .iConfiguration = DYNAMIC */ .bmAttributes = USB_CONFIG_ATT_SELFPOWER, }; /****************************** Gadget Bind ******************************/ static int __init hid_bind(struct usb_composite_dev *cdev) { struct usb_gadget *gadget = cdev->gadget; struct list_head *tmp; int status, gcnum, funcs = 0; list_for_each(tmp, &hidg_func_list) funcs++; if (!funcs) return -ENODEV; /* set up HID */ status = ghid_setup(cdev->gadget, funcs); if (status < 0) return status; gcnum = usb_gadget_controller_number(gadget); if (gcnum >= 0) device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); else device_desc.bcdDevice = cpu_to_le16(0x0300 | 0x0099); /* Allocate string descriptor numbers ... note that string * contents can be overridden by the composite_dev glue. */ /* device descriptor strings: manufacturer, product */ snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", init_utsname()->sysname, init_utsname()->release, gadget->name); status = usb_string_id(cdev); if (status < 0) return status; strings_dev[STRING_MANUFACTURER_IDX].id = status; device_desc.iManufacturer = status; status = usb_string_id(cdev); if (status < 0) return status; strings_dev[STRING_PRODUCT_IDX].id = status; device_desc.iProduct = status; /* register our configuration */ status = usb_add_config(cdev, &config_driver, do_config); if (status < 0) return status; dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n"); return 0; } static int __exit hid_unbind(struct usb_composite_dev *cdev) { ghid_cleanup(); return 0; } static int __init hidg_plat_driver_probe(struct platform_device *pdev) { struct hidg_func_descriptor *func = pdev->dev.platform_data; 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 __devexit 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, .unbind = __exit_p(hid_unbind), }; static struct platform_driver hidg_plat_driver = { .remove = __devexit_p(hidg_plat_driver_remove), .driver = { .owner = THIS_MODULE, .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, hid_bind); if (status < 0) platform_driver_unregister(&hidg_plat_driver); return status; } module_init(hidg_init); static void __exit hidg_cleanup(void) { platform_driver_unregister(&hidg_plat_driver); usb_composite_unregister(&hidg_driver); } module_exit(hidg_cleanup);