--- /dev/null
+/*
+ * 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>
+#include <linux/module.h>
+#include <linux/usb/composite.h>
+#include <linux/usb/g_hid.h>
+
+#include "gadget_chips.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 = 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 */
+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))
+ 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 list_head *tmp;
+ struct hidg_func_node *n, *m;
+ struct f_hid_opts *hid_opts;
+ int status, funcs = 0;
+
+ list_for_each(tmp, &hidg_func_list)
+ funcs++;
+
+ if (!funcs)
+ return -ENODEV;
+
+ list_for_each_entry(n, &hidg_func_list, node) {
+ n->fi = usb_get_function_instance("hid");
+ if (IS_ERR(n->fi)) {
+ status = PTR_ERR(n->fi);
+ goto put;
+ }
+ hid_opts = container_of(n->fi, struct f_hid_opts, func_inst);
+ hid_opts->subclass = n->func->subclass;
+ hid_opts->protocol = n->func->protocol;
+ hid_opts->report_length = n->func->report_length;
+ hid_opts->report_desc_length = n->func->report_desc_length;
+ hid_opts->report_desc = 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;
+
+ /* register our configuration */
+ status = usb_add_config(cdev, &config_driver, do_config);
+ if (status < 0)
+ goto put;
+
+ usb_composite_overwrite_options(cdev, &coverwrite);
+ dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
+
+ return 0;
+
+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);
+ }
+ 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 int 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,
+ .max_speed = USB_SPEED_HIGH,
+ .bind = hid_bind,
+ .unbind = hid_unbind,
+};
+
+static struct platform_driver hidg_plat_driver = {
+ .remove = 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);
Code Review / kvmfornfv.git / blobdiff