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71adf118 FC |
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. | |
71adf118 FC |
12 | */ |
13 | ||
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/list.h> | |
18 | ||
dc995fc2 | 19 | #include "gadget_chips.h" |
71adf118 FC |
20 | #define DRIVER_DESC "HID Gadget" |
21 | #define DRIVER_VERSION "2010/03/16" | |
22 | ||
23 | /*-------------------------------------------------------------------------*/ | |
24 | ||
25 | #define HIDG_VENDOR_NUM 0x0525 /* XXX NetChip */ | |
26 | #define HIDG_PRODUCT_NUM 0xa4ac /* Linux-USB HID gadget */ | |
27 | ||
28 | /*-------------------------------------------------------------------------*/ | |
29 | ||
30 | /* | |
31 | * kbuild is not very cooperative with respect to linking separately | |
32 | * compiled library objects into one module. So for now we won't use | |
33 | * separate compilation ... ensuring init/exit sections work to shrink | |
34 | * the runtime footprint, and giving us at least some parts of what | |
35 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. | |
36 | */ | |
37 | ||
38 | #include "composite.c" | |
71adf118 FC |
39 | |
40 | #include "f_hid.c" | |
41 | ||
42 | ||
43 | struct hidg_func_node { | |
44 | struct list_head node; | |
45 | struct hidg_func_descriptor *func; | |
46 | }; | |
47 | ||
48 | static LIST_HEAD(hidg_func_list); | |
49 | ||
50 | /*-------------------------------------------------------------------------*/ | |
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, */ | |
33d2832a OF |
61 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
62 | .bDeviceSubClass = 0, | |
63 | .bDeviceProtocol = 0, | |
71adf118 FC |
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 | ||
94 | #define STRING_MANUFACTURER_IDX 0 | |
95 | #define STRING_PRODUCT_IDX 1 | |
96 | ||
97 | static char manufacturer[50]; | |
98 | ||
99 | static struct usb_string strings_dev[] = { | |
100 | [STRING_MANUFACTURER_IDX].s = manufacturer, | |
101 | [STRING_PRODUCT_IDX].s = DRIVER_DESC, | |
102 | { } /* end of list */ | |
103 | }; | |
104 | ||
105 | static struct usb_gadget_strings stringtab_dev = { | |
106 | .language = 0x0409, /* en-us */ | |
107 | .strings = strings_dev, | |
108 | }; | |
109 | ||
110 | static struct usb_gadget_strings *dev_strings[] = { | |
111 | &stringtab_dev, | |
112 | NULL, | |
113 | }; | |
114 | ||
115 | ||
116 | ||
117 | /****************************** Configurations ******************************/ | |
118 | ||
e12995ec | 119 | static int __init do_config(struct usb_configuration *c) |
71adf118 FC |
120 | { |
121 | struct hidg_func_node *e; | |
122 | int func = 0, status = 0; | |
123 | ||
124 | if (gadget_is_otg(c->cdev->gadget)) { | |
125 | c->descriptors = otg_desc; | |
126 | c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; | |
127 | } | |
128 | ||
129 | list_for_each_entry(e, &hidg_func_list, node) { | |
130 | status = hidg_bind_config(c, e->func, func++); | |
131 | if (status) | |
132 | break; | |
133 | } | |
134 | ||
135 | return status; | |
136 | } | |
137 | ||
138 | static struct usb_configuration config_driver = { | |
139 | .label = "HID Gadget", | |
71adf118 FC |
140 | .bConfigurationValue = 1, |
141 | /* .iConfiguration = DYNAMIC */ | |
142 | .bmAttributes = USB_CONFIG_ATT_SELFPOWER, | |
143 | }; | |
144 | ||
145 | /****************************** Gadget Bind ******************************/ | |
146 | ||
e12995ec | 147 | static int __init hid_bind(struct usb_composite_dev *cdev) |
71adf118 FC |
148 | { |
149 | struct usb_gadget *gadget = cdev->gadget; | |
150 | struct list_head *tmp; | |
151 | int status, gcnum, funcs = 0; | |
152 | ||
153 | list_for_each(tmp, &hidg_func_list) | |
154 | funcs++; | |
155 | ||
156 | if (!funcs) | |
157 | return -ENODEV; | |
158 | ||
159 | /* set up HID */ | |
160 | status = ghid_setup(cdev->gadget, funcs); | |
161 | if (status < 0) | |
162 | return status; | |
163 | ||
164 | gcnum = usb_gadget_controller_number(gadget); | |
165 | if (gcnum >= 0) | |
166 | device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); | |
167 | else | |
168 | device_desc.bcdDevice = cpu_to_le16(0x0300 | 0x0099); | |
169 | ||
170 | ||
171 | /* Allocate string descriptor numbers ... note that string | |
172 | * contents can be overridden by the composite_dev glue. | |
173 | */ | |
174 | ||
175 | /* device descriptor strings: manufacturer, product */ | |
176 | snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", | |
177 | init_utsname()->sysname, init_utsname()->release, | |
178 | gadget->name); | |
71adf118 | 179 | |
e1f15ccb | 180 | status = usb_string_ids_tab(cdev, strings_dev); |
71adf118 FC |
181 | if (status < 0) |
182 | return status; | |
e1f15ccb SAS |
183 | device_desc.iManufacturer = strings_dev[STRING_MANUFACTURER_IDX].id; |
184 | device_desc.iProduct = strings_dev[STRING_PRODUCT_IDX].id; | |
71adf118 FC |
185 | |
186 | /* register our configuration */ | |
c9bfff9c | 187 | status = usb_add_config(cdev, &config_driver, do_config); |
71adf118 FC |
188 | if (status < 0) |
189 | return status; | |
190 | ||
191 | dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n"); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int __exit hid_unbind(struct usb_composite_dev *cdev) | |
197 | { | |
198 | ghid_cleanup(); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static int __init hidg_plat_driver_probe(struct platform_device *pdev) | |
203 | { | |
204 | struct hidg_func_descriptor *func = pdev->dev.platform_data; | |
205 | struct hidg_func_node *entry; | |
206 | ||
207 | if (!func) { | |
208 | dev_err(&pdev->dev, "Platform data missing\n"); | |
209 | return -ENODEV; | |
210 | } | |
211 | ||
212 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
213 | if (!entry) | |
214 | return -ENOMEM; | |
215 | ||
216 | entry->func = func; | |
217 | list_add_tail(&entry->node, &hidg_func_list); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static int __devexit hidg_plat_driver_remove(struct platform_device *pdev) | |
223 | { | |
224 | struct hidg_func_node *e, *n; | |
225 | ||
226 | list_for_each_entry_safe(e, n, &hidg_func_list, node) { | |
227 | list_del(&e->node); | |
228 | kfree(e); | |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | ||
235 | /****************************** Some noise ******************************/ | |
236 | ||
237 | ||
c2ec75c2 | 238 | static __refdata struct usb_composite_driver hidg_driver = { |
71adf118 FC |
239 | .name = "g_hid", |
240 | .dev = &device_desc, | |
241 | .strings = dev_strings, | |
35a0e0bf | 242 | .max_speed = USB_SPEED_HIGH, |
03e42bd5 | 243 | .bind = hid_bind, |
71adf118 FC |
244 | .unbind = __exit_p(hid_unbind), |
245 | }; | |
246 | ||
247 | static struct platform_driver hidg_plat_driver = { | |
248 | .remove = __devexit_p(hidg_plat_driver_remove), | |
249 | .driver = { | |
250 | .owner = THIS_MODULE, | |
251 | .name = "hidg", | |
252 | }, | |
253 | }; | |
254 | ||
255 | ||
256 | MODULE_DESCRIPTION(DRIVER_DESC); | |
257 | MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard"); | |
258 | MODULE_LICENSE("GPL"); | |
259 | ||
260 | static int __init hidg_init(void) | |
261 | { | |
da01c7a4 PK |
262 | int status; |
263 | ||
264 | status = platform_driver_probe(&hidg_plat_driver, | |
265 | hidg_plat_driver_probe); | |
266 | if (status < 0) | |
267 | return status; | |
268 | ||
03e42bd5 | 269 | status = usb_composite_probe(&hidg_driver); |
da01c7a4 PK |
270 | if (status < 0) |
271 | platform_driver_unregister(&hidg_plat_driver); | |
272 | ||
273 | return status; | |
71adf118 FC |
274 | } |
275 | module_init(hidg_init); | |
276 | ||
277 | static void __exit hidg_cleanup(void) | |
278 | { | |
279 | platform_driver_unregister(&hidg_plat_driver); | |
280 | usb_composite_unregister(&hidg_driver); | |
281 | } | |
282 | module_exit(hidg_cleanup); |