299 lines
7.1 KiB
C
299 lines
7.1 KiB
C
/*
|
|
* 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 __ref 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",
|
|
.bind = do_config,
|
|
.bConfigurationValue = 1,
|
|
/* .iConfiguration = DYNAMIC */
|
|
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
|
|
};
|
|
|
|
/****************************** Gadget Bind ******************************/
|
|
|
|
static int __ref 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);
|
|
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,
|
|
.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_register(&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);
|