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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> | |
721e2e91 SAS |
18 | #include <linux/module.h> |
19 | #include <linux/usb/composite.h> | |
71adf118 | 20 | |
dc995fc2 | 21 | #include "gadget_chips.h" |
71adf118 FC |
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 | */ | |
71adf118 FC |
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 | /*-------------------------------------------------------------------------*/ | |
7d16e8d3 | 50 | USB_GADGET_COMPOSITE_OPTIONS(); |
71adf118 FC |
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 */ | |
71adf118 | 93 | static struct usb_string strings_dev[] = { |
cc2683c3 | 94 | [USB_GADGET_MANUFACTURER_IDX].s = "", |
276e2e4f SAS |
95 | [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC, |
96 | [USB_GADGET_SERIAL_IDX].s = "", | |
71adf118 FC |
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 | ||
e12995ec | 114 | static int __init do_config(struct usb_configuration *c) |
71adf118 FC |
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", | |
71adf118 FC |
135 | .bConfigurationValue = 1, |
136 | /* .iConfiguration = DYNAMIC */ | |
137 | .bmAttributes = USB_CONFIG_ATT_SELFPOWER, | |
138 | }; | |
139 | ||
140 | /****************************** Gadget Bind ******************************/ | |
141 | ||
e12995ec | 142 | static int __init hid_bind(struct usb_composite_dev *cdev) |
71adf118 FC |
143 | { |
144 | struct usb_gadget *gadget = cdev->gadget; | |
145 | struct list_head *tmp; | |
146 | int status, gcnum, 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 | gcnum = usb_gadget_controller_number(gadget); | |
160 | if (gcnum >= 0) | |
161 | device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); | |
162 | else | |
163 | device_desc.bcdDevice = cpu_to_le16(0x0300 | 0x0099); | |
164 | ||
71adf118 FC |
165 | /* Allocate string descriptor numbers ... note that string |
166 | * contents can be overridden by the composite_dev glue. | |
167 | */ | |
168 | ||
e1f15ccb | 169 | status = usb_string_ids_tab(cdev, strings_dev); |
71adf118 FC |
170 | if (status < 0) |
171 | return status; | |
276e2e4f SAS |
172 | device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id; |
173 | device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id; | |
71adf118 FC |
174 | |
175 | /* register our configuration */ | |
c9bfff9c | 176 | status = usb_add_config(cdev, &config_driver, do_config); |
71adf118 FC |
177 | if (status < 0) |
178 | return status; | |
179 | ||
7d16e8d3 | 180 | usb_composite_overwrite_options(cdev, &coverwrite); |
71adf118 FC |
181 | dev_info(&gadget->dev, DRIVER_DESC ", version: " DRIVER_VERSION "\n"); |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int __exit hid_unbind(struct usb_composite_dev *cdev) | |
187 | { | |
188 | ghid_cleanup(); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static int __init hidg_plat_driver_probe(struct platform_device *pdev) | |
193 | { | |
194 | struct hidg_func_descriptor *func = pdev->dev.platform_data; | |
195 | struct hidg_func_node *entry; | |
196 | ||
197 | if (!func) { | |
198 | dev_err(&pdev->dev, "Platform data missing\n"); | |
199 | return -ENODEV; | |
200 | } | |
201 | ||
202 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
203 | if (!entry) | |
204 | return -ENOMEM; | |
205 | ||
206 | entry->func = func; | |
207 | list_add_tail(&entry->node, &hidg_func_list); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static int __devexit hidg_plat_driver_remove(struct platform_device *pdev) | |
213 | { | |
214 | struct hidg_func_node *e, *n; | |
215 | ||
216 | list_for_each_entry_safe(e, n, &hidg_func_list, node) { | |
217 | list_del(&e->node); | |
218 | kfree(e); | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | ||
225 | /****************************** Some noise ******************************/ | |
226 | ||
227 | ||
c2ec75c2 | 228 | static __refdata struct usb_composite_driver hidg_driver = { |
71adf118 FC |
229 | .name = "g_hid", |
230 | .dev = &device_desc, | |
231 | .strings = dev_strings, | |
35a0e0bf | 232 | .max_speed = USB_SPEED_HIGH, |
03e42bd5 | 233 | .bind = hid_bind, |
71adf118 FC |
234 | .unbind = __exit_p(hid_unbind), |
235 | }; | |
236 | ||
237 | static struct platform_driver hidg_plat_driver = { | |
238 | .remove = __devexit_p(hidg_plat_driver_remove), | |
239 | .driver = { | |
240 | .owner = THIS_MODULE, | |
241 | .name = "hidg", | |
242 | }, | |
243 | }; | |
244 | ||
245 | ||
246 | MODULE_DESCRIPTION(DRIVER_DESC); | |
247 | MODULE_AUTHOR("Fabien Chouteau, Peter Korsgaard"); | |
248 | MODULE_LICENSE("GPL"); | |
249 | ||
250 | static int __init hidg_init(void) | |
251 | { | |
da01c7a4 PK |
252 | int status; |
253 | ||
254 | status = platform_driver_probe(&hidg_plat_driver, | |
255 | hidg_plat_driver_probe); | |
256 | if (status < 0) | |
257 | return status; | |
258 | ||
03e42bd5 | 259 | status = usb_composite_probe(&hidg_driver); |
da01c7a4 PK |
260 | if (status < 0) |
261 | platform_driver_unregister(&hidg_plat_driver); | |
262 | ||
263 | return status; | |
71adf118 FC |
264 | } |
265 | module_init(hidg_init); | |
266 | ||
267 | static void __exit hidg_cleanup(void) | |
268 | { | |
269 | platform_driver_unregister(&hidg_plat_driver); | |
270 | usb_composite_unregister(&hidg_driver); | |
271 | } | |
272 | module_exit(hidg_cleanup); |