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Linux/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 #include <linux/module.h>
 19 #include <linux/usb/composite.h>
 20 
 21 #include "gadget_chips.h"
 22 #define DRIVER_DESC             "HID Gadget"
 23 #define DRIVER_VERSION          "2010/03/16"
 24 
 25 /*-------------------------------------------------------------------------*/
 26 
 27 #define HIDG_VENDOR_NUM         0x0525  /* XXX NetChip */
 28 #define HIDG_PRODUCT_NUM        0xa4ac  /* Linux-USB HID gadget */
 29 
 30 /*-------------------------------------------------------------------------*/
 31 
 32 /*
 33  * kbuild is not very cooperative with respect to linking separately
 34  * compiled library objects into one module.  So for now we won't use
 35  * separate compilation ... ensuring init/exit sections work to shrink
 36  * the runtime footprint, and giving us at least some parts of what
 37  * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
 38  */
 39 #include "f_hid.c"
 40 
 41 
 42 struct hidg_func_node {
 43         struct list_head node;
 44         struct hidg_func_descriptor *func;
 45 };
 46 
 47 static LIST_HEAD(hidg_func_list);
 48 
 49 /*-------------------------------------------------------------------------*/
 50 USB_GADGET_COMPOSITE_OPTIONS();
 51 
 52 static struct usb_device_descriptor device_desc = {
 53         .bLength =              sizeof device_desc,
 54         .bDescriptorType =      USB_DT_DEVICE,
 55 
 56         .bcdUSB =               cpu_to_le16(0x0200),
 57 
 58         /* .bDeviceClass =              USB_CLASS_COMM, */
 59         /* .bDeviceSubClass =   0, */
 60         /* .bDeviceProtocol =   0, */
 61         .bDeviceClass =         USB_CLASS_PER_INTERFACE,
 62         .bDeviceSubClass =      0,
 63         .bDeviceProtocol =      0,
 64         /* .bMaxPacketSize0 = f(hardware) */
 65 
 66         /* Vendor and product id can be overridden by module parameters.  */
 67         .idVendor =             cpu_to_le16(HIDG_VENDOR_NUM),
 68         .idProduct =            cpu_to_le16(HIDG_PRODUCT_NUM),
 69         /* .bcdDevice = f(hardware) */
 70         /* .iManufacturer = DYNAMIC */
 71         /* .iProduct = DYNAMIC */
 72         /* NO SERIAL NUMBER */
 73         .bNumConfigurations =   1,
 74 };
 75 
 76 static struct usb_otg_descriptor otg_descriptor = {
 77         .bLength =              sizeof otg_descriptor,
 78         .bDescriptorType =      USB_DT_OTG,
 79 
 80         /* REVISIT SRP-only hardware is possible, although
 81          * it would not be called "OTG" ...
 82          */
 83         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
 84 };
 85 
 86 static const struct usb_descriptor_header *otg_desc[] = {
 87         (struct usb_descriptor_header *) &otg_descriptor,
 88         NULL,
 89 };
 90 
 91 
 92 /* string IDs are assigned dynamically */
 93 static struct usb_string strings_dev[] = {
 94         [USB_GADGET_MANUFACTURER_IDX].s = "",
 95         [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
 96         [USB_GADGET_SERIAL_IDX].s = "",
 97         {  } /* end of list */
 98 };
 99 
100 static struct usb_gadget_strings stringtab_dev = {
101         .language       = 0x0409,       /* en-us */
102         .strings        = strings_dev,
103 };
104 
105 static struct usb_gadget_strings *dev_strings[] = {
106         &stringtab_dev,
107         NULL,
108 };
109 
110 
111 
112 /****************************** Configurations ******************************/
113 
114 static int __init do_config(struct usb_configuration *c)
115 {
116         struct hidg_func_node *e;
117         int func = 0, status = 0;
118 
119         if (gadget_is_otg(c->cdev->gadget)) {
120                 c->descriptors = otg_desc;
121                 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
122         }
123 
124         list_for_each_entry(e, &hidg_func_list, node) {
125                 status = hidg_bind_config(c, e->func, func++);
126                 if (status)
127                         break;
128         }
129 
130         return status;
131 }
132 
133 static struct usb_configuration config_driver = {
134         .label                  = "HID Gadget",
135         .bConfigurationValue    = 1,
136         /* .iConfiguration = DYNAMIC */
137         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
138 };
139 
140 /****************************** Gadget Bind ******************************/
141 
142 static int __init hid_bind(struct usb_composite_dev *cdev)
143 {
144         struct usb_gadget *gadget = cdev->gadget;
145         struct list_head *tmp;
146         int status, funcs = 0;
147 
148         list_for_each(tmp, &hidg_func_list)
149                 funcs++;
150 
151         if (!funcs)
152                 return -ENODEV;
153 
154         /* set up HID */
155         status = ghid_setup(cdev->gadget, funcs);
156         if (status < 0)
157                 return status;
158 
159         /* Allocate string descriptor numbers ... note that string
160          * contents can be overridden by the composite_dev glue.
161          */
162 
163         status = usb_string_ids_tab(cdev, strings_dev);
164         if (status < 0)
165                 return status;
166         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
167         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
168 
169         /* register our configuration */
170         status = usb_add_config(cdev, &config_driver, do_config);
171         if (status < 0)
172                 return status;
173 
174         usb_composite_overwrite_options(cdev, &coverwrite);
175         dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
176 
177         return 0;
178 }
179 
180 static int __exit hid_unbind(struct usb_composite_dev *cdev)
181 {
182         ghid_cleanup();
183         return 0;
184 }
185 
186 static int __init hidg_plat_driver_probe(struct platform_device *pdev)
187 {
188         struct hidg_func_descriptor *func = dev_get_platdata(&pdev->dev);
189         struct hidg_func_node *entry;
190 
191         if (!func) {
192                 dev_err(&pdev->dev, "Platform data missing\n");
193                 return -ENODEV;
194         }
195 
196         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
197         if (!entry)
198                 return -ENOMEM;
199 
200         entry->func = func;
201         list_add_tail(&entry->node, &hidg_func_list);
202 
203         return 0;
204 }
205 
206 static int hidg_plat_driver_remove(struct platform_device *pdev)
207 {
208         struct hidg_func_node *e, *n;
209 
210         list_for_each_entry_safe(e, n, &hidg_func_list, node) {
211                 list_del(&e->node);
212                 kfree(e);
213         }
214 
215         return 0;
216 }
217 
218 
219 /****************************** Some noise ******************************/
220 
221 
222 static __refdata struct usb_composite_driver hidg_driver = {
223         .name           = "g_hid",
224         .dev            = &device_desc,
225         .strings        = dev_strings,
226         .max_speed      = USB_SPEED_HIGH,
227         .bind           = hid_bind,
228         .unbind         = __exit_p(hid_unbind),
229 };
230 
231 static struct platform_driver hidg_plat_driver = {
232         .remove         = hidg_plat_driver_remove,
233         .driver         = {
234                 .owner  = THIS_MODULE,
235                 .name   = "hidg",
236         },
237 };
238 
239 
240 MODULE_DESCRIPTION(DRIVER_DESC);
241 MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard");
242 MODULE_LICENSE("GPL");
243 
244 static int __init hidg_init(void)
245 {
246         int status;
247 
248         status = platform_driver_probe(&hidg_plat_driver,
249                                 hidg_plat_driver_probe);
250         if (status < 0)
251                 return status;
252 
253         status = usb_composite_probe(&hidg_driver);
254         if (status < 0)
255                 platform_driver_unregister(&hidg_plat_driver);
256 
257         return status;
258 }
259 module_init(hidg_init);
260 
261 static void __exit hidg_cleanup(void)
262 {
263         platform_driver_unregister(&hidg_plat_driver);
264         usb_composite_unregister(&hidg_driver);
265 }
266 module_exit(hidg_cleanup);
267 

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