278 lines
6.9 KiB
C
Executable file
278 lines
6.9 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0+
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/*
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* serial.c -- USB gadget serial driver
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*
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* Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
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* Copyright (C) 2008 by David Brownell
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* Copyright (C) 2008 by Nokia Corporation
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include "u_serial.h"
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/* Defines */
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#define GS_VERSION_STR "v2.4"
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#define GS_VERSION_NUM 0x2400
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#define GS_LONG_NAME "Gadget Serial"
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#define GS_VERSION_NAME GS_LONG_NAME " " GS_VERSION_STR
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/*-------------------------------------------------------------------------*/
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USB_GADGET_COMPOSITE_OPTIONS();
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/* Thanks to NetChip Technologies for donating this product ID.
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*
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* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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#define GS_VENDOR_ID 0x0525 /* NetChip */
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#define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
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#define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
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#define GS_CDC_OBEX_PRODUCT_ID 0xa4a9 /* ... as CDC-OBEX */
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/* string IDs are assigned dynamically */
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#define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX
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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 = GS_VERSION_NAME,
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[USB_GADGET_SERIAL_IDX].s = "",
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[STRING_DESCRIPTION_IDX].s = NULL /* updated; f(use_acm) */,
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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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static struct usb_device_descriptor device_desc = {
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.bLength = USB_DT_DEVICE_SIZE,
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.bDescriptorType = USB_DT_DEVICE,
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/* .bcdUSB = DYNAMIC */
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/* .bDeviceClass = f(use_acm) */
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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/* .bMaxPacketSize0 = f(hardware) */
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.idVendor = cpu_to_le16(GS_VENDOR_ID),
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/* .idProduct = f(use_acm) */
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.bcdDevice = cpu_to_le16(GS_VERSION_NUM),
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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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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/*-------------------------------------------------------------------------*/
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/* Module */
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MODULE_DESCRIPTION(GS_VERSION_NAME);
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MODULE_AUTHOR("Al Borchers");
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MODULE_AUTHOR("David Brownell");
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MODULE_LICENSE("GPL");
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static bool use_acm = true;
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module_param(use_acm, bool, 0);
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MODULE_PARM_DESC(use_acm, "Use CDC ACM, default=yes");
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static bool use_obex = false;
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module_param(use_obex, bool, 0);
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MODULE_PARM_DESC(use_obex, "Use CDC OBEX, default=no");
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static unsigned n_ports = 1;
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module_param(n_ports, uint, 0);
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MODULE_PARM_DESC(n_ports, "number of ports to create, default=1");
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/*-------------------------------------------------------------------------*/
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static struct usb_configuration serial_config_driver = {
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/* .label = f(use_acm) */
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/* .bConfigurationValue = f(use_acm) */
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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static struct usb_function_instance *fi_serial[MAX_U_SERIAL_PORTS];
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static struct usb_function *f_serial[MAX_U_SERIAL_PORTS];
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static int serial_register_ports(struct usb_composite_dev *cdev,
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struct usb_configuration *c, const char *f_name)
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{
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int i;
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int ret;
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ret = usb_add_config_only(cdev, c);
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if (ret)
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goto out;
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for (i = 0; i < n_ports; i++) {
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fi_serial[i] = usb_get_function_instance(f_name);
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if (IS_ERR(fi_serial[i])) {
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ret = PTR_ERR(fi_serial[i]);
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goto fail;
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}
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f_serial[i] = usb_get_function(fi_serial[i]);
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if (IS_ERR(f_serial[i])) {
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ret = PTR_ERR(f_serial[i]);
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goto err_get_func;
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}
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ret = usb_add_function(c, f_serial[i]);
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if (ret)
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goto err_add_func;
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}
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return 0;
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err_add_func:
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usb_put_function(f_serial[i]);
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err_get_func:
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usb_put_function_instance(fi_serial[i]);
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fail:
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i--;
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while (i >= 0) {
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usb_remove_function(c, f_serial[i]);
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usb_put_function(f_serial[i]);
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usb_put_function_instance(fi_serial[i]);
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i--;
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}
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out:
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return ret;
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}
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static int gs_bind(struct usb_composite_dev *cdev)
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{
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int status;
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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 fail;
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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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status = strings_dev[STRING_DESCRIPTION_IDX].id;
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serial_config_driver.iConfiguration = status;
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if (gadget_is_otg(cdev->gadget)) {
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if (!otg_desc[0]) {
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struct usb_descriptor_header *usb_desc;
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usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
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if (!usb_desc) {
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status = -ENOMEM;
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goto fail;
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}
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usb_otg_descriptor_init(cdev->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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serial_config_driver.descriptors = otg_desc;
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serial_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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/* register our configuration */
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if (use_acm) {
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status = serial_register_ports(cdev, &serial_config_driver,
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"acm");
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usb_ep_autoconfig_reset(cdev->gadget);
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} else if (use_obex)
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status = serial_register_ports(cdev, &serial_config_driver,
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"obex");
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else {
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status = serial_register_ports(cdev, &serial_config_driver,
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"gser");
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}
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if (status < 0)
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goto fail1;
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usb_composite_overwrite_options(cdev, &coverwrite);
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INFO(cdev, "%s\n", GS_VERSION_NAME);
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return 0;
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fail1:
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kfree(otg_desc[0]);
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otg_desc[0] = NULL;
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fail:
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return status;
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}
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static int gs_unbind(struct usb_composite_dev *cdev)
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{
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int i;
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for (i = 0; i < n_ports; i++) {
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usb_put_function(f_serial[i]);
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usb_put_function_instance(fi_serial[i]);
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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 struct usb_composite_driver gserial_driver = {
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.name = "g_serial",
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.dev = &device_desc,
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.strings = dev_strings,
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.max_speed = USB_SPEED_SUPER,
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.bind = gs_bind,
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.unbind = gs_unbind,
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};
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static int __init init(void)
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{
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/* We *could* export two configs; that'd be much cleaner...
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* but neither of these product IDs was defined that way.
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*/
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if (use_acm) {
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serial_config_driver.label = "CDC ACM config";
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serial_config_driver.bConfigurationValue = 2;
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device_desc.bDeviceClass = USB_CLASS_COMM;
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device_desc.idProduct =
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cpu_to_le16(GS_CDC_PRODUCT_ID);
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} else if (use_obex) {
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serial_config_driver.label = "CDC OBEX config";
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serial_config_driver.bConfigurationValue = 3;
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device_desc.bDeviceClass = USB_CLASS_COMM;
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device_desc.idProduct =
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cpu_to_le16(GS_CDC_OBEX_PRODUCT_ID);
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} else {
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serial_config_driver.label = "Generic Serial config";
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serial_config_driver.bConfigurationValue = 1;
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device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
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device_desc.idProduct =
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cpu_to_le16(GS_PRODUCT_ID);
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}
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strings_dev[STRING_DESCRIPTION_IDX].s = serial_config_driver.label;
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return usb_composite_probe(&gserial_driver);
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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usb_composite_unregister(&gserial_driver);
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}
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module_exit(cleanup);
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