1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/usb/gadget/legacy/hid.c b/drivers/usb/gadget/legacy/hid.c
new file mode 100644
index 0000000000..4ca67b2f8f
--- /dev/null
+++ b/drivers/usb/gadget/legacy/hid.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * hid.c -- HID Composite driver
+ *
+ * Based on multi.c
+ *
+ * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
+ */
+
+
+#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);