drivers/usb/gadget/legacy/acm_ms.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * acm_ms.c -- Composite driver, with ACM and mass storage support
   4  *
   5  * Copyright (C) 2008 David Brownell
   6  * Copyright (C) 2008 Nokia Corporation
   7  * Author: David Brownell
   8  * Modified: Klaus Schwarzkopf <schwarzkopf@sensortherm.de>
   9  *
  10  * Heavily based on multi.c and cdc2.c
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15
  16 #include "u_serial.h"
  17
  18 #define DRIVER_DESC             "Composite Gadget (ACM + MS)"
  19 #define DRIVER_VERSION          "2011/10/10"
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  25  * Instead:  allocate your own, using normal USB-IF procedures.
  26  */
  27 #define ACM_MS_VENDOR_NUM       0x1d6b  /* Linux Foundation */
  28 #define ACM_MS_PRODUCT_NUM      0x0106  /* Composite Gadget: ACM + MS*/
  29
  30 #include "f_mass_storage.h"
  31
  32 /*-------------------------------------------------------------------------*/
  33 USB_GADGET_COMPOSITE_OPTIONS();
  34
  35 static struct usb_device_descriptor device_desc = {
  36         .bLength =              sizeof device_desc,
  37         .bDescriptorType =      USB_DT_DEVICE,
  38
  39         /* .bcdUSB = DYNAMIC */
  40
  41         .bDeviceClass =         USB_CLASS_MISC /* 0xEF */,
  42         .bDeviceSubClass =      2,
  43         .bDeviceProtocol =      1,
  44
  45         /* .bMaxPacketSize0 = f(hardware) */
  46
  47         /* Vendor and product id can be overridden by module parameters.  */
  48         .idVendor =             cpu_to_le16(ACM_MS_VENDOR_NUM),
  49         .idProduct =            cpu_to_le16(ACM_MS_PRODUCT_NUM),
  50         /* .bcdDevice = f(hardware) */
  51         /* .iManufacturer = DYNAMIC */
  52         /* .iProduct = DYNAMIC */
  53         /* NO SERIAL NUMBER */
  54         /*.bNumConfigurations = DYNAMIC*/
  55 };
  56
  57 static const struct usb_descriptor_header *otg_desc[2];
  58
  59 /* string IDs are assigned dynamically */
  60 static struct usb_string strings_dev[] = {
  61         [USB_GADGET_MANUFACTURER_IDX].s = "",
  62         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
  63         [USB_GADGET_SERIAL_IDX].s = "",
  64         {  } /* end of list */
  65 };
  66
  67 static struct usb_gadget_strings stringtab_dev = {
  68         .language       = 0x0409,       /* en-us */
  69         .strings        = strings_dev,
  70 };
  71
  72 static struct usb_gadget_strings *dev_strings[] = {
  73         &stringtab_dev,
  74         NULL,
  75 };
  76
  77 /****************************** Configurations ******************************/
  78
  79 static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
  80 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
  81
  82 static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
  83
  84 #else
  85
  86 /*
  87  * Number of buffers we will use.
  88  * 2 is usually enough for good buffering pipeline
  89  */
  90 #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
  91
  92 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
  93
  94 FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
  95
  96 /*-------------------------------------------------------------------------*/
  97 static struct usb_function *f_acm;
  98 static struct usb_function_instance *f_acm_inst;
  99
 100 static struct usb_function_instance *fi_msg;
 101 static struct usb_function *f_msg;
 102
 103 /*
 104  * We _always_ have both ACM and mass storage functions.
 105  */
 106 static int acm_ms_do_config(struct usb_configuration *c)
 107 {
 108         int     status;
 109
 110         if (gadget_is_otg(c->cdev->gadget)) {
 111                 c->descriptors = otg_desc;
 112                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 113         }
 114
 115         f_acm = usb_get_function(f_acm_inst);
 116         if (IS_ERR(f_acm))
 117                 return PTR_ERR(f_acm);
 118
 119         f_msg = usb_get_function(fi_msg);
 120         if (IS_ERR(f_msg)) {
 121                 status = PTR_ERR(f_msg);
 122                 goto put_acm;
 123         }
 124
 125         status = usb_add_function(c, f_acm);
 126         if (status < 0)
 127                 goto put_msg;
 128
 129         status = usb_add_function(c, f_msg);
 130         if (status)
 131                 goto remove_acm;
 132
 133         return 0;
 134 remove_acm:
 135         usb_remove_function(c, f_acm);
 136 put_msg:
 137         usb_put_function(f_msg);
 138 put_acm:
 139         usb_put_function(f_acm);
 140         return status;
 141 }
 142
 143 static struct usb_configuration acm_ms_config_driver = {
 144         .label                  = DRIVER_DESC,
 145         .bConfigurationValue    = 1,
 146         /* .iConfiguration = DYNAMIC */
 147         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 148 };
 149
 150 /*-------------------------------------------------------------------------*/
 151
 152 static int acm_ms_bind(struct usb_composite_dev *cdev)
 153 {
 154         struct usb_gadget       *gadget = cdev->gadget;
 155         struct fsg_opts         *opts;
 156         struct fsg_config       config;
 157         int                     status;
 158
 159         f_acm_inst = usb_get_function_instance("acm");
 160         if (IS_ERR(f_acm_inst))
 161                 return PTR_ERR(f_acm_inst);
 162
 163         fi_msg = usb_get_function_instance("mass_storage");
 164         if (IS_ERR(fi_msg)) {
 165                 status = PTR_ERR(fi_msg);
 166                 goto fail_get_msg;
 167         }
 168
 169         /* set up mass storage function */
 170         fsg_config_from_params(&config, &fsg_mod_data, fsg_num_buffers);
 171         opts = fsg_opts_from_func_inst(fi_msg);
 172
 173         opts->no_configfs = true;
 174         status = fsg_common_set_num_buffers(opts->common, fsg_num_buffers);
 175         if (status)
 176                 goto fail;
 177
 178         status = fsg_common_set_cdev(opts->common, cdev, config.can_stall);
 179         if (status)
 180                 goto fail_set_cdev;
 181
 182         fsg_common_set_sysfs(opts->common, true);
 183         status = fsg_common_create_luns(opts->common, &config);
 184         if (status)
 185                 goto fail_set_cdev;
 186
 187         fsg_common_set_inquiry_string(opts->common, config.vendor_name,
 188                                       config.product_name);
 189         /*
 190          * Allocate string descriptor numbers ... note that string
 191          * contents can be overridden by the composite_dev glue.
 192          */
 193         status = usb_string_ids_tab(cdev, strings_dev);
 194         if (status < 0)
 195                 goto fail_string_ids;
 196         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 197         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 198
 199         if (gadget_is_otg(gadget) && !otg_desc[0]) {
 200                 struct usb_descriptor_header *usb_desc;
 201
 202                 usb_desc = usb_otg_descriptor_alloc(gadget);
 203                 if (!usb_desc) {
 204                         status = -ENOMEM;
 205                         goto fail_string_ids;
 206                 }
 207                 usb_otg_descriptor_init(gadget, usb_desc);
 208                 otg_desc[0] = usb_desc;
 209                 otg_desc[1] = NULL;
 210         }
 211
 212         /* register our configuration */
 213         status = usb_add_config(cdev, &acm_ms_config_driver, acm_ms_do_config);
 214         if (status < 0)
 215                 goto fail_otg_desc;
 216
 217         usb_composite_overwrite_options(cdev, &coverwrite);
 218         dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
 219                         DRIVER_DESC);
 220         return 0;
 221
 222         /* error recovery */
 223 fail_otg_desc:
 224         kfree(otg_desc[0]);
 225         otg_desc[0] = NULL;
 226 fail_string_ids:
 227         fsg_common_remove_luns(opts->common);
 228 fail_set_cdev:
 229         fsg_common_free_buffers(opts->common);
 230 fail:
 231         usb_put_function_instance(fi_msg);
 232 fail_get_msg:
 233         usb_put_function_instance(f_acm_inst);
 234         return status;
 235 }
 236
 237 static int acm_ms_unbind(struct usb_composite_dev *cdev)
 238 {
 239         usb_put_function(f_msg);
 240         usb_put_function_instance(fi_msg);
 241         usb_put_function(f_acm);
 242         usb_put_function_instance(f_acm_inst);
 243         kfree(otg_desc[0]);
 244         otg_desc[0] = NULL;
 245
 246         return 0;
 247 }
 248
 249 static struct usb_composite_driver acm_ms_driver = {
 250         .name           = "g_acm_ms",
 251         .dev            = &device_desc,
 252         .max_speed      = USB_SPEED_SUPER,
 253         .strings        = dev_strings,
 254         .bind           = acm_ms_bind,
 255         .unbind         = acm_ms_unbind,
 256 };
 257
 258 module_usb_composite_driver(acm_ms_driver);
 259
 260 MODULE_DESCRIPTION(DRIVER_DESC);
 261 MODULE_AUTHOR("Klaus Schwarzkopf <schwarzkopf@sensortherm.de>");
 262 MODULE_LICENSE("GPL v2");