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  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23
  24 #include <linux/kernel.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/list.h>
  27
  28 #define DRIVER_DESC             "HID Gadget"
  29 #define DRIVER_VERSION          "2010/03/16"
  30
  31 /*-------------------------------------------------------------------------*/
  32
  33 #define HIDG_VENDOR_NUM         0x0525  /* XXX NetChip */
  34 #define HIDG_PRODUCT_NUM        0xa4ac  /* Linux-USB HID gadget */
  35
  36 /*-------------------------------------------------------------------------*/
  37
  38 /*
  39  * kbuild is not very cooperative with respect to linking separately
  40  * compiled library objects into one module.  So for now we won't use
  41  * separate compilation ... ensuring init/exit sections work to shrink
  42  * the runtime footprint, and giving us at least some parts of what
  43  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
  44  */
  45
  46 #include "composite.c"
  47 #include "usbstring.c"
  48 #include "config.c"
  49 #include "epautoconf.c"
  50
  51 #include "f_hid.c"
  52
  53
  54 struct hidg_func_node {
  55         struct list_head node;
  56         struct hidg_func_descriptor *func;
  57 };
  58
  59 static LIST_HEAD(hidg_func_list);
  60
  61 /*-------------------------------------------------------------------------*/
  62
  63 static struct usb_device_descriptor device_desc = {
  64         .bLength =              sizeof device_desc,
  65         .bDescriptorType =      USB_DT_DEVICE,
  66
  67         .bcdUSB =               cpu_to_le16(0x0200),
  68
  69         /* .bDeviceClass =              USB_CLASS_COMM, */
  70         /* .bDeviceSubClass =   0, */
  71         /* .bDeviceProtocol =   0, */
  72         .bDeviceClass =         0xEF,
  73         .bDeviceSubClass =      2,
  74         .bDeviceProtocol =      1,
  75         /* .bMaxPacketSize0 = f(hardware) */
  76
  77         /* Vendor and product id can be overridden by module parameters.  */
  78         .idVendor =             cpu_to_le16(HIDG_VENDOR_NUM),
  79         .idProduct =            cpu_to_le16(HIDG_PRODUCT_NUM),
  80         /* .bcdDevice = f(hardware) */
  81         /* .iManufacturer = DYNAMIC */
  82         /* .iProduct = DYNAMIC */
  83         /* NO SERIAL NUMBER */
  84         .bNumConfigurations =   1,
  85 };
  86
  87 static struct usb_otg_descriptor otg_descriptor = {
  88         .bLength =              sizeof otg_descriptor,
  89         .bDescriptorType =      USB_DT_OTG,
  90
  91         /* REVISIT SRP-only hardware is possible, although
  92          * it would not be called "OTG" ...
  93          */
  94         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
  95 };
  96
  97 static const struct usb_descriptor_header *otg_desc[] = {
  98         (struct usb_descriptor_header *) &otg_descriptor,
  99         NULL,
 100 };
 101
 102
 103 /* string IDs are assigned dynamically */
 104
 105 #define STRING_MANUFACTURER_IDX         0
 106 #define STRING_PRODUCT_IDX              1
 107
 108 static char manufacturer[50];
 109
 110 static struct usb_string strings_dev[] = {
 111         [STRING_MANUFACTURER_IDX].s = manufacturer,
 112         [STRING_PRODUCT_IDX].s = DRIVER_DESC,
 113         {  } /* end of list */
 114 };
 115
 116 static struct usb_gadget_strings stringtab_dev = {
 117         .language       = 0x0409,       /* en-us */
 118         .strings        = strings_dev,
 119 };
 120
 121 static struct usb_gadget_strings *dev_strings[] = {
 122         &stringtab_dev,
 123         NULL,
 124 };
 125
 126
 127
 128 /****************************** Configurations ******************************/
 129
 130 static int __init do_config(struct usb_configuration *c)
 131 {
 132         struct hidg_func_node *e;
 133         int func = 0, status = 0;
 134
 135         if (gadget_is_otg(c->cdev->gadget)) {
 136                 c->descriptors = otg_desc;
 137                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 138         }
 139
 140         list_for_each_entry(e, &hidg_func_list, node) {
 141                 status = hidg_bind_config(c, e->func, func++);
 142                 if (status)
 143                         break;
 144         }
 145
 146         return status;
 147 }
 148
 149 static struct usb_configuration config_driver = {
 150         .label                  = "HID Gadget",
 151         .bConfigurationValue    = 1,
 152         /* .iConfiguration = DYNAMIC */
 153         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
 154 };
 155
 156 /****************************** Gadget Bind ******************************/
 157
 158 static int __init hid_bind(struct usb_composite_dev *cdev)
 159 {
 160         struct usb_gadget *gadget = cdev->gadget;
 161         struct list_head *tmp;
 162         int status, gcnum, funcs = 0;
 163
 164         list_for_each(tmp, &hidg_func_list)
 165                 funcs++;
 166
 167         if (!funcs)
 168                 return -ENODEV;
 169
 170         /* set up HID */
 171         status = ghid_setup(cdev->gadget, funcs);
 172         if (status < 0)
 173                 return status;
 174
 175         gcnum = usb_gadget_controller_number(gadget);
 176         if (gcnum >= 0)
 177                 device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
 178         else
 179                 device_desc.bcdDevice = cpu_to_le16(0x0300 | 0x0099);
 180
 181
 182         /* Allocate string descriptor numbers ... note that string
 183          * contents can be overridden by the composite_dev glue.
 184          */
 185
 186         /* device descriptor strings: manufacturer, product */
 187         snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
 188                 init_utsname()->sysname, init_utsname()->release,
 189                 gadget->name);
 190         status = usb_string_id(cdev);
 191         if (status < 0)
 192                 return status;
 193         strings_dev[STRING_MANUFACTURER_IDX].id = status;
 194         device_desc.iManufacturer = status;
 195
 196         status = usb_string_id(cdev);
 197         if (status < 0)
 198                 return status;
 199         strings_dev[STRING_PRODUCT_IDX].id = status;
 200         device_desc.iProduct = status;
 201
 202         /* register our configuration */
 203         status = usb_add_config(cdev, &config_driver, do_config);
 204         if (status < 0)
 205                 return status;
 206
 207         dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
 208
 209         return 0;
 210 }
 211
 212 static int __exit hid_unbind(struct usb_composite_dev *cdev)
 213 {
 214         ghid_cleanup();
 215         return 0;
 216 }
 217
 218 static int __init hidg_plat_driver_probe(struct platform_device *pdev)
 219 {
 220         struct hidg_func_descriptor *func = pdev->dev.platform_data;
 221         struct hidg_func_node *entry;
 222
 223         if (!func) {
 224                 dev_err(&pdev->dev, "Platform data missing\n");
 225                 return -ENODEV;
 226         }
 227
 228         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 229         if (!entry)
 230                 return -ENOMEM;
 231
 232         entry->func = func;
 233         list_add_tail(&entry->node, &hidg_func_list);
 234
 235         return 0;
 236 }
 237
 238 static int __devexit hidg_plat_driver_remove(struct platform_device *pdev)
 239 {
 240         struct hidg_func_node *e, *n;
 241
 242         list_for_each_entry_safe(e, n, &hidg_func_list, node) {
 243                 list_del(&e->node);
 244                 kfree(e);
 245         }
 246
 247         return 0;
 248 }
 249
 250
 251 /****************************** Some noise ******************************/
 252
 253
 254 static struct usb_composite_driver hidg_driver = {
 255         .name           = "g_hid",
 256         .dev            = &device_desc,
 257         .strings        = dev_strings,
 258         .unbind         = __exit_p(hid_unbind),
 259 };
 260
 261 static struct platform_driver hidg_plat_driver = {
 262         .remove         = __devexit_p(hidg_plat_driver_remove),
 263         .driver         = {
 264                 .owner  = THIS_MODULE,
 265                 .name   = "hidg",
 266         },
 267 };
 268
 269
 270 MODULE_DESCRIPTION(DRIVER_DESC);
 271 MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard");
 272 MODULE_LICENSE("GPL");
 273
 274 static int __init hidg_init(void)
 275 {
 276         int status;
 277
 278         status = platform_driver_probe(&hidg_plat_driver,
 279                                 hidg_plat_driver_probe);
 280         if (status < 0)
 281                 return status;
 282
 283         status = usb_composite_probe(&hidg_driver, hid_bind);
 284         if (status < 0)
 285                 platform_driver_unregister(&hidg_plat_driver);
 286
 287         return status;
 288 }
 289 module_init(hidg_init);
 290
 291 static void __exit hidg_cleanup(void)
 292 {
 293         platform_driver_unregister(&hidg_plat_driver);
 294         usb_composite_unregister(&hidg_driver);
 295 }
 296 module_exit(hidg_cleanup);