kernel/drivers/usb/gadget/legacy/acm_ms.c

   1 /*
   2  * acm_ms.c -- Composite driver, with ACM and mass storage support
   3  *
   4  * Copyright (C) 2008 David Brownell
   5  * Copyright (C) 2008 Nokia Corporation
   6  * Author: David Brownell
   7  * Modified: Klaus Schwarzkopf <schwarzkopf@sensortherm.de>
   8  *
   9  * Heavily based on multi.c and cdc2.c
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19
  20 #include "u_serial.h"
  21
  22 #define DRIVER_DESC             "Composite Gadget (ACM + MS)"
  23 #define DRIVER_VERSION          "2011/10/10"
  24
  25 /*-------------------------------------------------------------------------*/
  26
  27 /*
  28  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
  29  * Instead:  allocate your own, using normal USB-IF procedures.
  30  */
  31 #define ACM_MS_VENDOR_NUM       0x1d6b  /* Linux Foundation */
  32 #define ACM_MS_PRODUCT_NUM      0x0106  /* Composite Gadget: ACM + MS*/
  33
  34 #include "f_mass_storage.h"
  35
  36 /*-------------------------------------------------------------------------*/
  37 USB_GADGET_COMPOSITE_OPTIONS();
  38
  39 static struct usb_device_descriptor device_desc = {
  40         .bLength =              sizeof device_desc,
  41         .bDescriptorType =      USB_DT_DEVICE,
  42
  43         .bcdUSB =               cpu_to_le16(0x0200),
  44
  45         .bDeviceClass =         USB_CLASS_MISC /* 0xEF */,
  46         .bDeviceSubClass =      2,
  47         .bDeviceProtocol =      1,
  48
  49         /* .bMaxPacketSize0 = f(hardware) */
  50
  51         /* Vendor and product id can be overridden by module parameters.  */
  52         .idVendor =             cpu_to_le16(ACM_MS_VENDOR_NUM),
  53         .idProduct =            cpu_to_le16(ACM_MS_PRODUCT_NUM),
  54         /* .bcdDevice = f(hardware) */
  55         /* .iManufacturer = DYNAMIC */
  56         /* .iProduct = DYNAMIC */
  57         /* NO SERIAL NUMBER */
  58         /*.bNumConfigurations = DYNAMIC*/
  59 };
  60
  61 static const struct usb_descriptor_header *otg_desc[2];
  62
  63 /* string IDs are assigned dynamically */
  64 static struct usb_string strings_dev[] = {
  65         [USB_GADGET_MANUFACTURER_IDX].s = "",
  66         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
  67         [USB_GADGET_SERIAL_IDX].s = "",
  68         {  } /* end of list */
  69 };
  70
  71 static struct usb_gadget_strings stringtab_dev = {
  72         .language       = 0x0409,       /* en-us */
  73         .strings        = strings_dev,
  74 };
  75
  76 static struct usb_gadget_strings *dev_strings[] = {
  77         &stringtab_dev,
  78         NULL,
  79 };
  80
  81 /****************************** Configurations ******************************/
  82
  83 static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
  84 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
  85
  86 static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
  87
  88 #else
  89
  90 /*
  91  * Number of buffers we will use.
  92  * 2 is usually enough for good buffering pipeline
  93  */
  94 #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
  95
  96 #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
  97
  98 FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
  99
 100 /*-------------------------------------------------------------------------*/
 101 static struct usb_function *f_acm;
 102 static struct usb_function_instance *f_acm_inst;
 103
 104 static struct usb_function_instance *fi_msg;
 105 static struct usb_function *f_msg;
 106
 107 /*
 108  * We _always_ have both ACM and mass storage functions.
 109  */
 110 static int acm_ms_do_config(struct usb_configuration *c)
 111 {
 112         struct fsg_opts *opts;
 113         int     status;
 114
 115         if (gadget_is_otg(c->cdev->gadget)) {
 116                 c->descriptors = otg_desc;
 117                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 118         }
 119
 120         opts = fsg_opts_from_func_inst(fi_msg);
 121
 122         f_acm = usb_get_function(f_acm_inst);
 123         if (IS_ERR(f_acm))
 124                 return PTR_ERR(f_acm);
 125
 126         f_msg = usb_get_function(fi_msg);
 127         if (IS_ERR(f_msg)) {
 128                 status = PTR_ERR(f_msg);
 129                 goto put_acm;
 130         }
 131
 132         status = usb_add_function(c, f_acm);
 133         if (status < 0)
 134                 goto put_msg;
 135
 136         status = usb_add_function(c, f_msg);
 137         if (status)
 138                 goto remove_acm;
 139
 140         return 0;
 141 remove_acm:
 142         usb_remove_function(c, f_acm);
 143 put_msg:
 144         usb_put_function(f_msg);
 145 put_acm:
 146         usb_put_function(f_acm);
 147         return status;
 148 }
 149
 150 static struct usb_configuration acm_ms_config_driver = {
 151         .label                  = DRIVER_DESC,
 152         .bConfigurationValue    = 1,
 153         /* .iConfiguration = DYNAMIC */
 154         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 155 };
 156
 157 /*-------------------------------------------------------------------------*/
 158
 159 static int acm_ms_bind(struct usb_composite_dev *cdev)
 160 {
 161         struct usb_gadget       *gadget = cdev->gadget;
 162         struct fsg_opts         *opts;
 163         struct fsg_config       config;
 164         int                     status;
 165
 166         f_acm_inst = usb_get_function_instance("acm");
 167         if (IS_ERR(f_acm_inst))
 168                 return PTR_ERR(f_acm_inst);
 169
 170         fi_msg = usb_get_function_instance("mass_storage");
 171         if (IS_ERR(fi_msg)) {
 172                 status = PTR_ERR(fi_msg);
 173                 goto fail_get_msg;
 174         }
 175
 176         /* set up mass storage function */
 177         fsg_config_from_params(&config, &fsg_mod_data, fsg_num_buffers);
 178         opts = fsg_opts_from_func_inst(fi_msg);
 179
 180         opts->no_configfs = true;
 181         status = fsg_common_set_num_buffers(opts->common, fsg_num_buffers);
 182         if (status)
 183                 goto fail;
 184
 185         status = fsg_common_set_cdev(opts->common, cdev, config.can_stall);
 186         if (status)
 187                 goto fail_set_cdev;
 188
 189         fsg_common_set_sysfs(opts->common, true);
 190         status = fsg_common_create_luns(opts->common, &config);
 191         if (status)
 192                 goto fail_set_cdev;
 193
 194         fsg_common_set_inquiry_string(opts->common, config.vendor_name,
 195                                       config.product_name);
 196         /*
 197          * Allocate string descriptor numbers ... note that string
 198          * contents can be overridden by the composite_dev glue.
 199          */
 200         status = usb_string_ids_tab(cdev, strings_dev);
 201         if (status < 0)
 202                 goto fail_string_ids;
 203         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 204         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 205
 206         if (gadget_is_otg(gadget) && !otg_desc[0]) {
 207                 struct usb_descriptor_header *usb_desc;
 208
 209                 usb_desc = usb_otg_descriptor_alloc(gadget);
 210                 if (!usb_desc)
 211                         goto fail_string_ids;
 212                 usb_otg_descriptor_init(gadget, usb_desc);
 213                 otg_desc[0] = usb_desc;
 214                 otg_desc[1] = NULL;
 215         }
 216
 217         /* register our configuration */
 218         status = usb_add_config(cdev, &acm_ms_config_driver, acm_ms_do_config);
 219         if (status < 0)
 220                 goto fail_otg_desc;
 221
 222         usb_composite_overwrite_options(cdev, &coverwrite);
 223         dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
 224                         DRIVER_DESC);
 225         return 0;
 226
 227         /* error recovery */
 228 fail_otg_desc:
 229         kfree(otg_desc[0]);
 230         otg_desc[0] = NULL;
 231 fail_string_ids:
 232         fsg_common_remove_luns(opts->common);
 233 fail_set_cdev:
 234         fsg_common_free_buffers(opts->common);
 235 fail:
 236         usb_put_function_instance(fi_msg);
 237 fail_get_msg:
 238         usb_put_function_instance(f_acm_inst);
 239         return status;
 240 }
 241
 242 static int acm_ms_unbind(struct usb_composite_dev *cdev)
 243 {
 244         usb_put_function(f_msg);
 245         usb_put_function_instance(fi_msg);
 246         usb_put_function(f_acm);
 247         usb_put_function_instance(f_acm_inst);
 248         kfree(otg_desc[0]);
 249         otg_desc[0] = NULL;
 250
 251         return 0;
 252 }
 253
 254 static struct usb_composite_driver acm_ms_driver = {
 255         .name           = "g_acm_ms",
 256         .dev            = &device_desc,
 257         .max_speed      = USB_SPEED_SUPER,
 258         .strings        = dev_strings,
 259         .bind           = acm_ms_bind,
 260         .unbind         = acm_ms_unbind,
 261 };
 262
 263 module_usb_composite_driver(acm_ms_driver);
 264
 265 MODULE_DESCRIPTION(DRIVER_DESC);
 266 MODULE_AUTHOR("Klaus Schwarzkopf <schwarzkopf@sensortherm.de>");
 267 MODULE_LICENSE("GPL v2");