drivers/usb/gadget/hid.c

   1 /*
   2  * hid.c -- HID Composite driver
   3  *
   4  * Based on multi.c
   5  *
   6  * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14
  15 #include <linux/kernel.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/list.h>
  18
  19 #define DRIVER_DESC             "HID Gadget"
  20 #define DRIVER_VERSION          "2010/03/16"
  21
  22 /*-------------------------------------------------------------------------*/
  23
  24 #define HIDG_VENDOR_NUM         0x0525  /* XXX NetChip */
  25 #define HIDG_PRODUCT_NUM        0xa4ac  /* Linux-USB HID gadget */
  26
  27 /*-------------------------------------------------------------------------*/
  28
  29 /*
  30  * kbuild is not very cooperative with respect to linking separately
  31  * compiled library objects into one module.  So for now we won't use
  32  * separate compilation ... ensuring init/exit sections work to shrink
  33  * the runtime footprint, and giving us at least some parts of what
  34  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  35  */
  36
  37 #include "composite.c"
  38 #include "usbstring.c"
  39 #include "config.c"
  40 #include "epautoconf.c"
  41
  42 #include "f_hid.c"
  43
  44
  45 struct hidg_func_node {
  46         struct list_head node;
  47         struct hidg_func_descriptor *func;
  48 };
  49
  50 static LIST_HEAD(hidg_func_list);
  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_COMM, */
  61         /* .bDeviceSubClass =   0, */
  62         /* .bDeviceProtocol =   0, */
  63         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
  64         .bDeviceSubClass =      0,
  65         .bDeviceProtocol =      0,
  66         /* .bMaxPacketSize0 = f(hardware) */
  67
  68         /* Vendor and product id can be overridden by module parameters.  */
  69         .idVendor =             cpu_to_le16(HIDG_VENDOR_NUM),
  70         .idProduct =            cpu_to_le16(HIDG_PRODUCT_NUM),
  71         /* .bcdDevice = f(hardware) */
  72         /* .iManufacturer = DYNAMIC */
  73         /* .iProduct = DYNAMIC */
  74         /* NO SERIAL NUMBER */
  75         .bNumConfigurations =   1,
  76 };
  77
  78 static struct usb_otg_descriptor otg_descriptor = {
  79         .bLength =              sizeof otg_descriptor,
  80         .bDescriptorType =      USB_DT_OTG,
  81
  82         /* REVISIT SRP-only hardware is possible, although
  83          * it would not be called "OTG" ...
  84          */
  85         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
  86 };
  87
  88 static const struct usb_descriptor_header *otg_desc[] = {
  89         (struct usb_descriptor_header *) &otg_descriptor,
  90         NULL,
  91 };
  92
  93
  94 /* string IDs are assigned dynamically */
  95
  96 #define STRING_MANUFACTURER_IDX         0
  97 #define STRING_PRODUCT_IDX              1
  98
  99 static char manufacturer[50];
 100
 101 static struct usb_string strings_dev[] = {
 102         [STRING_MANUFACTURER_IDX].s = manufacturer,
 103         [STRING_PRODUCT_IDX].s = DRIVER_DESC,
 104         {  } /* end of list */
 105 };
 106
 107 static struct usb_gadget_strings stringtab_dev = {
 108         .language       = 0x0409,       /* en-us */
 109         .strings        = strings_dev,
 110 };
 111
 112 static struct usb_gadget_strings *dev_strings[] = {
 113         &stringtab_dev,
 114         NULL,
 115 };
 116
 117
 118
 119 /****************************** Configurations ******************************/
 120
 121 static int __init do_config(struct usb_configuration *c)
 122 {
 123         struct hidg_func_node *e;
 124         int func = 0, status = 0;
 125
 126         if (gadget_is_otg(c->cdev->gadget)) {
 127                 c->descriptors = otg_desc;
 128                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 129         }
 130
 131         list_for_each_entry(e, &hidg_func_list, node) {
 132                 status = hidg_bind_config(c, e->func, func++);
 133                 if (status)
 134                         break;
 135         }
 136
 137         return status;
 138 }
 139
 140 static struct usb_configuration config_driver = {
 141         .label                  = "HID Gadget",
 142         .bConfigurationValue    = 1,
 143         /* .iConfiguration = DYNAMIC */
 144         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 145 };
 146
 147 /****************************** Gadget Bind ******************************/
 148
 149 static int __init hid_bind(struct usb_composite_dev *cdev)
 150 {
 151         struct usb_gadget *gadget = cdev->gadget;
 152         struct list_head *tmp;
 153         int status, gcnum, funcs = 0;
 154
 155         list_for_each(tmp, &hidg_func_list)
 156                 funcs++;
 157
 158         if (!funcs)
 159                 return -ENODEV;
 160
 161         /* set up HID */
 162         status = ghid_setup(cdev->gadget, funcs);
 163         if (status < 0)
 164                 return status;
 165
 166         gcnum = usb_gadget_controller_number(gadget);
 167         if (gcnum >= 0)
 168                 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
 169         else
 170                 device_desc.bcdDevice = cpu_to_le16(0x0300 | 0x0099);
 171
 172
 173         /* Allocate string descriptor numbers ... note that string
 174          * contents can be overridden by the composite_dev glue.
 175          */
 176
 177         /* device descriptor strings: manufacturer, product */
 178         snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
 179                 init_utsname()->sysname, init_utsname()->release,
 180                 gadget->name);
 181         status = usb_string_id(cdev);
 182         if (status < 0)
 183                 return status;
 184         strings_dev[STRING_MANUFACTURER_IDX].id = status;
 185         device_desc.iManufacturer = status;
 186
 187         status = usb_string_id(cdev);
 188         if (status < 0)
 189                 return status;
 190         strings_dev[STRING_PRODUCT_IDX].id = status;
 191         device_desc.iProduct = status;
 192
 193         /* register our configuration */
 194         status = usb_add_config(cdev, &config_driver, do_config);
 195         if (status < 0)
 196                 return status;
 197
 198         dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
 199
 200         return 0;
 201 }
 202
 203 static int __exit hid_unbind(struct usb_composite_dev *cdev)
 204 {
 205         ghid_cleanup();
 206         return 0;
 207 }
 208
 209 static int __init hidg_plat_driver_probe(struct platform_device *pdev)
 210 {
 211         struct hidg_func_descriptor *func = pdev->dev.platform_data;
 212         struct hidg_func_node *entry;
 213
 214         if (!func) {
 215                 dev_err(&pdev->dev, "Platform data missing\n");
 216                 return -ENODEV;
 217         }
 218
 219         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 220         if (!entry)
 221                 return -ENOMEM;
 222
 223         entry->func = func;
 224         list_add_tail(&entry->node, &hidg_func_list);
 225
 226         return 0;
 227 }
 228
 229 static int __devexit hidg_plat_driver_remove(struct platform_device *pdev)
 230 {
 231         struct hidg_func_node *e, *n;
 232
 233         list_for_each_entry_safe(e, n, &hidg_func_list, node) {
 234                 list_del(&e->node);
 235                 kfree(e);
 236         }
 237
 238         return 0;
 239 }
 240
 241
 242 /****************************** Some noise ******************************/
 243
 244
 245 static struct usb_composite_driver hidg_driver = {
 246         .name           = "g_hid",
 247         .dev            = &device_desc,
 248         .strings        = dev_strings,
 249         .max_speed      = USB_SPEED_HIGH,
 250         .unbind         = __exit_p(hid_unbind),
 251 };
 252
 253 static struct platform_driver hidg_plat_driver = {
 254         .remove         = __devexit_p(hidg_plat_driver_remove),
 255         .driver         = {
 256                 .owner  = THIS_MODULE,
 257                 .name   = "hidg",
 258         },
 259 };
 260
 261
 262 MODULE_DESCRIPTION(DRIVER_DESC);
 263 MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard");
 264 MODULE_LICENSE("GPL");
 265
 266 static int __init hidg_init(void)
 267 {
 268         int status;
 269
 270         status = platform_driver_probe(&hidg_plat_driver,
 271                                 hidg_plat_driver_probe);
 272         if (status < 0)
 273                 return status;
 274
 275         status = usb_composite_probe(&hidg_driver, hid_bind);
 276         if (status < 0)
 277                 platform_driver_unregister(&hidg_plat_driver);
 278
 279         return status;
 280 }
 281 module_init(hidg_init);
 282
 283 static void __exit hidg_cleanup(void)
 284 {
 285         platform_driver_unregister(&hidg_plat_driver);
 286         usb_composite_unregister(&hidg_driver);
 287 }
 288 module_exit(hidg_cleanup);