300 lines
6.7 KiB
C
300 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#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 <linux/usb/g_hid.h>
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#define DRIVER_DESC "HID Gadget"
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#define DRIVER_VERSION "2010/03/16"
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#include "u_hid.h"
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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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struct hidg_func_node {
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struct usb_function_instance *fi;
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struct usb_function *f;
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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 = DYNAMIC */
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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 const struct usb_descriptor_header *otg_desc[2];
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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 do_config(struct usb_configuration *c)
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{
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struct hidg_func_node *e, *n;
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int 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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e->f = usb_get_function(e->fi);
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if (IS_ERR(e->f)) {
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status = PTR_ERR(e->f);
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goto put;
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}
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status = usb_add_function(c, e->f);
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if (status < 0) {
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usb_put_function(e->f);
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goto put;
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}
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}
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return 0;
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put:
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list_for_each_entry(n, &hidg_func_list, node) {
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if (n == e)
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break;
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usb_remove_function(c, n->f);
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usb_put_function(n->f);
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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 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 hidg_func_node *n = NULL, *m, *iter_n;
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struct f_hid_opts *hid_opts;
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int status, funcs;
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funcs = list_count_nodes(&hidg_func_list);
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if (!funcs)
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return -ENODEV;
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list_for_each_entry(iter_n, &hidg_func_list, node) {
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iter_n->fi = usb_get_function_instance("hid");
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if (IS_ERR(iter_n->fi)) {
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status = PTR_ERR(iter_n->fi);
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n = iter_n;
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goto put;
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}
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hid_opts = container_of(iter_n->fi, struct f_hid_opts, func_inst);
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hid_opts->subclass = iter_n->func->subclass;
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hid_opts->protocol = iter_n->func->protocol;
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hid_opts->report_length = iter_n->func->report_length;
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hid_opts->report_desc_length = iter_n->func->report_desc_length;
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hid_opts->report_desc = iter_n->func->report_desc;
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}
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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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goto put;
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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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if (gadget_is_otg(gadget) && !otg_desc[0]) {
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struct usb_descriptor_header *usb_desc;
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usb_desc = usb_otg_descriptor_alloc(gadget);
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if (!usb_desc) {
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status = -ENOMEM;
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goto put;
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}
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usb_otg_descriptor_init(gadget, usb_desc);
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otg_desc[0] = usb_desc;
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otg_desc[1] = NULL;
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}
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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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goto free_otg_desc;
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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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free_otg_desc:
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kfree(otg_desc[0]);
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otg_desc[0] = NULL;
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put:
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list_for_each_entry(m, &hidg_func_list, node) {
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if (m == n)
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break;
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usb_put_function_instance(m->fi);
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}
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return status;
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}
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static int hid_unbind(struct usb_composite_dev *cdev)
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{
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struct hidg_func_node *n;
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list_for_each_entry(n, &hidg_func_list, node) {
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usb_put_function(n->f);
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usb_put_function_instance(n->fi);
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}
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kfree(otg_desc[0]);
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otg_desc[0] = NULL;
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return 0;
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}
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static int hidg_plat_driver_probe(struct platform_device *pdev)
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{
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struct hidg_func_descriptor *func = dev_get_platdata(&pdev->dev);
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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 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 = 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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.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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usb_composite_unregister(&hidg_driver);
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platform_driver_unregister(&hidg_plat_driver);
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}
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module_exit(hidg_cleanup);
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