drivers/usb/gadget/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/utsname.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 /*-------------------------------------------------------------------------*/
  35
  36 /*
  37  * Kbuild is not very cooperative with respect to linking separately
  38  * compiled library objects into one module.  So for now we won't use
  39  * separate compilation ... ensuring init/exit sections work to shrink
  40  * the runtime footprint, and giving us at least some parts of what
  41  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  42  */
  43
  44 #include "composite.c"
  45 #include "usbstring.c"
  46 #include "config.c"
  47 #include "epautoconf.c"
  48 #include "u_serial.c"
  49 #include "f_acm.c"
  50 #include "f_mass_storage.c"
  51
  52 /*-------------------------------------------------------------------------*/
  53
  54 static struct usb_device_descriptor device_desc = {
  55         .bLength =              sizeof device_desc,
  56         .bDescriptorType =      USB_DT_DEVICE,
  57
  58         .bcdUSB =               cpu_to_le16(0x0200),
  59
  60         .bDeviceClass =         USB_CLASS_MISC /* 0xEF */,
  61         .bDeviceSubClass =      2,
  62         .bDeviceProtocol =      1,
  63
  64         /* .bMaxPacketSize0 = f(hardware) */
  65
  66         /* Vendor and product id can be overridden by module parameters.  */
  67         .idVendor =             cpu_to_le16(ACM_MS_VENDOR_NUM),
  68         .idProduct =            cpu_to_le16(ACM_MS_PRODUCT_NUM),
  69         /* .bcdDevice = f(hardware) */
  70         /* .iManufacturer = DYNAMIC */
  71         /* .iProduct = DYNAMIC */
  72         /* NO SERIAL NUMBER */
  73         /*.bNumConfigurations = DYNAMIC*/
  74 };
  75
  76 static struct usb_otg_descriptor otg_descriptor = {
  77         .bLength =              sizeof otg_descriptor,
  78         .bDescriptorType =      USB_DT_OTG,
  79
  80         /*
  81          * REVISIT SRP-only hardware is possible, although
  82          * it would not be called "OTG" ...
  83          */
  84         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
  85 };
  86
  87 static const struct usb_descriptor_header *otg_desc[] = {
  88         (struct usb_descriptor_header *) &otg_descriptor,
  89         NULL,
  90 };
  91
  92
  93 /* string IDs are assigned dynamically */
  94
  95 #define STRING_MANUFACTURER_IDX         0
  96 #define STRING_PRODUCT_IDX              1
  97
  98 static char manufacturer[50];
  99
 100 static struct usb_string strings_dev[] = {
 101         [STRING_MANUFACTURER_IDX].s = manufacturer,
 102         [STRING_PRODUCT_IDX].s = DRIVER_DESC,
 103         {  } /* end of list */
 104 };
 105
 106 static struct usb_gadget_strings stringtab_dev = {
 107         .language       = 0x0409,       /* en-us */
 108         .strings        = strings_dev,
 109 };
 110
 111 static struct usb_gadget_strings *dev_strings[] = {
 112         &stringtab_dev,
 113         NULL,
 114 };
 115
 116 /****************************** Configurations ******************************/
 117
 118 static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
 119 FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
 120
 121 static struct fsg_common fsg_common;
 122
 123 /*-------------------------------------------------------------------------*/
 124
 125 /*
 126  * We _always_ have both ACM and mass storage functions.
 127  */
 128 static int __init acm_ms_do_config(struct usb_configuration *c)
 129 {
 130         int     status;
 131
 132         if (gadget_is_otg(c->cdev->gadget)) {
 133                 c->descriptors = otg_desc;
 134                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 135         }
 136
 137
 138         status = acm_bind_config(c, 0);
 139         if (status < 0)
 140                 return status;
 141
 142         status = fsg_bind_config(c->cdev, c, &fsg_common);
 143         if (status < 0)
 144                 return status;
 145
 146         return 0;
 147 }
 148
 149 static struct usb_configuration acm_ms_config_driver = {
 150         .label                  = DRIVER_DESC,
 151         .bConfigurationValue    = 1,
 152         /* .iConfiguration = DYNAMIC */
 153         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 154 };
 155
 156 /*-------------------------------------------------------------------------*/
 157
 158 static int __init acm_ms_bind(struct usb_composite_dev *cdev)
 159 {
 160         int                     gcnum;
 161         struct usb_gadget       *gadget = cdev->gadget;
 162         int                     status;
 163         void                    *retp;
 164
 165         /* set up serial link layer */
 166         status = gserial_setup(cdev->gadget, 1);
 167         if (status < 0)
 168                 return status;
 169
 170         /* set up mass storage function */
 171         retp = fsg_common_from_params(&fsg_common, cdev, &fsg_mod_data);
 172         if (IS_ERR(retp)) {
 173                 status = PTR_ERR(retp);
 174                 goto fail0;
 175         }
 176
 177         /* set bcdDevice */
 178         gcnum = usb_gadget_controller_number(gadget);
 179         if (gcnum >= 0) {
 180                 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
 181         } else {
 182                 WARNING(cdev, "controller '%s' not recognized; trying %s\n",
 183                                 gadget->name,
 184                                 acm_ms_config_driver.label);
 185                 device_desc.bcdDevice =
 186                         cpu_to_le16(0x0300 | 0x0099);
 187         }
 188
 189         /*
 190          * Allocate string descriptor numbers ... note that string
 191          * contents can be overridden by the composite_dev glue.
 192          */
 193
 194         /* device descriptor strings: manufacturer, product */
 195         snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
 196                 init_utsname()->sysname, init_utsname()->release,
 197                 gadget->name);
 198         status = usb_string_id(cdev);
 199         if (status < 0)
 200                 goto fail1;
 201         strings_dev[STRING_MANUFACTURER_IDX].id = status;
 202         device_desc.iManufacturer = status;
 203
 204         status = usb_string_id(cdev);
 205         if (status < 0)
 206                 goto fail1;
 207         strings_dev[STRING_PRODUCT_IDX].id = status;
 208         device_desc.iProduct = status;
 209
 210         /* register our configuration */
 211         status = usb_add_config(cdev, &acm_ms_config_driver, acm_ms_do_config);
 212         if (status < 0)
 213                 goto fail1;
 214
 215         dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
 216                         DRIVER_DESC);
 217         fsg_common_put(&fsg_common);
 218         return 0;
 219
 220         /* error recovery */
 221 fail1:
 222         fsg_common_put(&fsg_common);
 223 fail0:
 224         gserial_cleanup();
 225         return status;
 226 }
 227
 228 static int __exit acm_ms_unbind(struct usb_composite_dev *cdev)
 229 {
 230         gserial_cleanup();
 231
 232         return 0;
 233 }
 234
 235 static struct usb_composite_driver acm_ms_driver = {
 236         .name           = "g_acm_ms",
 237         .dev            = &device_desc,
 238         .strings        = dev_strings,
 239         .unbind         = __exit_p(acm_ms_unbind),
 240 };
 241
 242 MODULE_DESCRIPTION(DRIVER_DESC);
 243 MODULE_AUTHOR("Klaus Schwarzkopf <schwarzkopf@sensortherm.de>");
 244 MODULE_LICENSE("GPL v2");
 245
 246 static int __init init(void)
 247 {
 248         return usb_composite_probe(&acm_ms_driver, acm_ms_bind);
 249 }
 250 module_init(init);
 251
 252 static void __exit cleanup(void)
 253 {
 254         usb_composite_unregister(&acm_ms_driver);
 255 }
 256 module_exit(cleanup);