| /* |
| * 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. |
| */ |
| |
| |
| #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 = 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 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 __refdata struct usb_composite_driver hidg_driver = { |
| .name = "g_hid", |
| .dev = &device_desc, |
| .strings = dev_strings, |
| .max_speed = USB_SPEED_HIGH, |
| .bind = hid_bind, |
| .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); |
| 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); |