267 lines
6.3 KiB
C
267 lines
6.3 KiB
C
/*
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* hid.c -- HID Composite driver
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*
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* Based on multi.c
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*
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* Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/usb/composite.h>
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#include "gadget_chips.h"
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#define DRIVER_DESC "HID Gadget"
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#define DRIVER_VERSION "2010/03/16"
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/*-------------------------------------------------------------------------*/
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#define HIDG_VENDOR_NUM 0x0525 /* XXX NetChip */
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#define HIDG_PRODUCT_NUM 0xa4ac /* Linux-USB HID gadget */
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/*-------------------------------------------------------------------------*/
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/*
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* kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "f_hid.c"
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struct hidg_func_node {
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struct list_head node;
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struct hidg_func_descriptor *func;
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};
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static LIST_HEAD(hidg_func_list);
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/*-------------------------------------------------------------------------*/
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USB_GADGET_COMPOSITE_OPTIONS();
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = cpu_to_le16(0x0200),
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/* .bDeviceClass = USB_CLASS_COMM, */
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/* .bDeviceSubClass = 0, */
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/* .bDeviceProtocol = 0, */
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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/* .bMaxPacketSize0 = f(hardware) */
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/* Vendor and product id can be overridden by module parameters. */
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.idVendor = cpu_to_le16(HIDG_VENDOR_NUM),
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.idProduct = cpu_to_le16(HIDG_PRODUCT_NUM),
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/* .bcdDevice = f(hardware) */
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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/* NO SERIAL NUMBER */
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.bNumConfigurations = 1,
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};
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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/* string IDs are assigned dynamically */
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = "",
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[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
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[USB_GADGET_SERIAL_IDX].s = "",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&stringtab_dev,
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NULL,
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};
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/****************************** Configurations ******************************/
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static int __init do_config(struct usb_configuration *c)
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{
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struct hidg_func_node *e;
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int func = 0, status = 0;
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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list_for_each_entry(e, &hidg_func_list, node) {
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status = hidg_bind_config(c, e->func, func++);
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if (status)
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break;
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}
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return status;
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}
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static struct usb_configuration config_driver = {
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.label = "HID Gadget",
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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/****************************** Gadget Bind ******************************/
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static int __init hid_bind(struct usb_composite_dev *cdev)
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{
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struct usb_gadget *gadget = cdev->gadget;
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struct list_head *tmp;
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int status, funcs = 0;
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list_for_each(tmp, &hidg_func_list)
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funcs++;
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if (!funcs)
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return -ENODEV;
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/* set up HID */
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status = ghid_setup(cdev->gadget, funcs);
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if (status < 0)
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return status;
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/* Allocate string descriptor numbers ... note that string
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* contents can be overridden by the composite_dev glue.
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*/
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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return status;
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device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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/* register our configuration */
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status = usb_add_config(cdev, &config_driver, do_config);
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if (status < 0)
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return status;
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usb_composite_overwrite_options(cdev, &coverwrite);
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dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
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return 0;
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}
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static int __exit hid_unbind(struct usb_composite_dev *cdev)
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{
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ghid_cleanup();
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return 0;
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}
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static int __init hidg_plat_driver_probe(struct platform_device *pdev)
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{
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struct hidg_func_descriptor *func = pdev->dev.platform_data;
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struct hidg_func_node *entry;
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if (!func) {
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dev_err(&pdev->dev, "Platform data missing\n");
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return -ENODEV;
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}
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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entry->func = func;
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list_add_tail(&entry->node, &hidg_func_list);
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return 0;
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}
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static int hidg_plat_driver_remove(struct platform_device *pdev)
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{
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struct hidg_func_node *e, *n;
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list_for_each_entry_safe(e, n, &hidg_func_list, node) {
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list_del(&e->node);
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kfree(e);
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}
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return 0;
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}
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/****************************** Some noise ******************************/
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static __refdata struct usb_composite_driver hidg_driver = {
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.name = "g_hid",
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.dev = &device_desc,
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.strings = dev_strings,
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.max_speed = USB_SPEED_HIGH,
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.bind = hid_bind,
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.unbind = __exit_p(hid_unbind),
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};
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static struct platform_driver hidg_plat_driver = {
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.remove = hidg_plat_driver_remove,
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.driver = {
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.owner = THIS_MODULE,
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.name = "hidg",
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},
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};
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard");
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MODULE_LICENSE("GPL");
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static int __init hidg_init(void)
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{
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int status;
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status = platform_driver_probe(&hidg_plat_driver,
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hidg_plat_driver_probe);
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if (status < 0)
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return status;
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status = usb_composite_probe(&hidg_driver);
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if (status < 0)
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platform_driver_unregister(&hidg_plat_driver);
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return status;
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}
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module_init(hidg_init);
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static void __exit hidg_cleanup(void)
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{
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platform_driver_unregister(&hidg_plat_driver);
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usb_composite_unregister(&hidg_driver);
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}
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module_exit(hidg_cleanup);
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