264 lines
6.6 KiB
C
264 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* acm_ms.c -- Composite driver, with ACM and mass storage support
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*
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* Copyright (C) 2008 David Brownell
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* Copyright (C) 2008 Nokia Corporation
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* Author: David Brownell
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* Modified: Klaus Schwarzkopf <schwarzkopf@sensortherm.de>
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*
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* Heavily based on multi.c and cdc2.c
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "u_serial.h"
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#define DRIVER_DESC "Composite Gadget (ACM + MS)"
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#define DRIVER_VERSION "2011/10/10"
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/*-------------------------------------------------------------------------*/
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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 ACM_MS_VENDOR_NUM 0x1d6b /* Linux Foundation */
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#define ACM_MS_PRODUCT_NUM 0x0106 /* Composite Gadget: ACM + MS*/
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#include "f_mass_storage.h"
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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_MISC /* 0xEF */,
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.bDeviceSubClass = 2,
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.bDeviceProtocol = 1,
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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(ACM_MS_VENDOR_NUM),
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.idProduct = cpu_to_le16(ACM_MS_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 = DYNAMIC*/
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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 struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
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#ifdef CONFIG_USB_GADGET_DEBUG_FILES
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static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
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#else
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/*
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* Number of buffers we will use.
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* 2 is usually enough for good buffering pipeline
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*/
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#define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
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#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
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FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
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/*-------------------------------------------------------------------------*/
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static struct usb_function *f_acm;
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static struct usb_function_instance *f_acm_inst;
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static struct usb_function_instance *fi_msg;
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static struct usb_function *f_msg;
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/*
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* We _always_ have both ACM and mass storage functions.
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*/
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static int acm_ms_do_config(struct usb_configuration *c)
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{
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struct fsg_opts *opts;
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int status;
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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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opts = fsg_opts_from_func_inst(fi_msg);
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f_acm = usb_get_function(f_acm_inst);
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if (IS_ERR(f_acm))
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return PTR_ERR(f_acm);
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f_msg = usb_get_function(fi_msg);
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if (IS_ERR(f_msg)) {
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status = PTR_ERR(f_msg);
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goto put_acm;
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}
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status = usb_add_function(c, f_acm);
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if (status < 0)
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goto put_msg;
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status = usb_add_function(c, f_msg);
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if (status)
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goto remove_acm;
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return 0;
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remove_acm:
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usb_remove_function(c, f_acm);
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put_msg:
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usb_put_function(f_msg);
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put_acm:
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usb_put_function(f_acm);
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return status;
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}
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static struct usb_configuration acm_ms_config_driver = {
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.label = DRIVER_DESC,
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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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/*-------------------------------------------------------------------------*/
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static int acm_ms_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 fsg_opts *opts;
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struct fsg_config config;
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int status;
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f_acm_inst = usb_get_function_instance("acm");
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if (IS_ERR(f_acm_inst))
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return PTR_ERR(f_acm_inst);
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fi_msg = usb_get_function_instance("mass_storage");
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if (IS_ERR(fi_msg)) {
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status = PTR_ERR(fi_msg);
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goto fail_get_msg;
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}
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/* set up mass storage function */
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fsg_config_from_params(&config, &fsg_mod_data, fsg_num_buffers);
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opts = fsg_opts_from_func_inst(fi_msg);
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opts->no_configfs = true;
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status = fsg_common_set_num_buffers(opts->common, fsg_num_buffers);
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if (status)
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goto fail;
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status = fsg_common_set_cdev(opts->common, cdev, config.can_stall);
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if (status)
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goto fail_set_cdev;
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fsg_common_set_sysfs(opts->common, true);
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status = fsg_common_create_luns(opts->common, &config);
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if (status)
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goto fail_set_cdev;
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fsg_common_set_inquiry_string(opts->common, config.vendor_name,
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config.product_name);
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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 fail_string_ids;
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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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goto fail_string_ids;
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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, &acm_ms_config_driver, acm_ms_do_config);
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if (status < 0)
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goto fail_otg_desc;
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usb_composite_overwrite_options(cdev, &coverwrite);
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dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
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DRIVER_DESC);
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return 0;
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/* error recovery */
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fail_otg_desc:
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kfree(otg_desc[0]);
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otg_desc[0] = NULL;
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fail_string_ids:
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fsg_common_remove_luns(opts->common);
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fail_set_cdev:
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fsg_common_free_buffers(opts->common);
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fail:
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usb_put_function_instance(fi_msg);
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fail_get_msg:
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usb_put_function_instance(f_acm_inst);
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return status;
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}
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static int acm_ms_unbind(struct usb_composite_dev *cdev)
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{
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usb_put_function(f_msg);
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usb_put_function_instance(fi_msg);
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usb_put_function(f_acm);
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usb_put_function_instance(f_acm_inst);
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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 acm_ms_driver = {
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.name = "g_acm_ms",
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.dev = &device_desc,
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.max_speed = USB_SPEED_SUPER,
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.strings = dev_strings,
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.bind = acm_ms_bind,
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.unbind = acm_ms_unbind,
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};
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module_usb_composite_driver(acm_ms_driver);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Klaus Schwarzkopf <schwarzkopf@sensortherm.de>");
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MODULE_LICENSE("GPL v2");
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