// SPDX-License-Identifier: GPL-2.0+
/*
* hid.c -- HID Composite driver
*
* Based on multi.c
*
* Copyright (C) 2010 Fabien Chouteau <[email protected]>
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb/composite.h>
#include <linux/usb/g_hid.h>
#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)) {
status = PTR_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 hidg_func_node *n = NULL, *m, *iter_n;
struct f_hid_opts *hid_opts;
int status, funcs;
funcs = list_count_nodes(&hidg_func_list);
if (!funcs)
return -ENODEV;
list_for_each_entry(iter_n, &hidg_func_list, node) {
iter_n->fi = usb_get_function_instance("hid");
if (IS_ERR(iter_n->fi)) {
status = PTR_ERR(iter_n->fi);
n = iter_n;
goto put;
}
hid_opts = container_of(iter_n->fi, struct f_hid_opts, func_inst);
hid_opts->subclass = iter_n->func->subclass;
hid_opts->protocol = iter_n->func->protocol;
hid_opts->report_length = iter_n->func->report_length;
hid_opts->report_desc_length = iter_n->func->report_desc_length;
hid_opts->report_desc = iter_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 void 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);
}
}
/****************************** 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_new = 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);
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