This source file includes following definitions.
- func_to_gser
- gser_set_alt
- gser_disable
- gser_bind
- to_f_serial_opts
- serial_attr_release
- f_serial_port_num_show
- gser_free_inst
- gser_alloc_inst
- gser_free
- gser_unbind
- gser_alloc
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10 #include <linux/slab.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/device.h>
14
15 #include "u_serial.h"
16
17
18
19
20
21
22
23
24
25
26
27 struct f_gser {
28 struct gserial port;
29 u8 data_id;
30 u8 port_num;
31 };
32
33 static inline struct f_gser *func_to_gser(struct usb_function *f)
34 {
35 return container_of(f, struct f_gser, port.func);
36 }
37
38
39
40
41
42 static struct usb_interface_descriptor gser_interface_desc = {
43 .bLength = USB_DT_INTERFACE_SIZE,
44 .bDescriptorType = USB_DT_INTERFACE,
45
46 .bNumEndpoints = 2,
47 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
48 .bInterfaceSubClass = 0,
49 .bInterfaceProtocol = 0,
50
51 };
52
53
54
55 static struct usb_endpoint_descriptor gser_fs_in_desc = {
56 .bLength = USB_DT_ENDPOINT_SIZE,
57 .bDescriptorType = USB_DT_ENDPOINT,
58 .bEndpointAddress = USB_DIR_IN,
59 .bmAttributes = USB_ENDPOINT_XFER_BULK,
60 };
61
62 static struct usb_endpoint_descriptor gser_fs_out_desc = {
63 .bLength = USB_DT_ENDPOINT_SIZE,
64 .bDescriptorType = USB_DT_ENDPOINT,
65 .bEndpointAddress = USB_DIR_OUT,
66 .bmAttributes = USB_ENDPOINT_XFER_BULK,
67 };
68
69 static struct usb_descriptor_header *gser_fs_function[] = {
70 (struct usb_descriptor_header *) &gser_interface_desc,
71 (struct usb_descriptor_header *) &gser_fs_in_desc,
72 (struct usb_descriptor_header *) &gser_fs_out_desc,
73 NULL,
74 };
75
76
77
78 static struct usb_endpoint_descriptor gser_hs_in_desc = {
79 .bLength = USB_DT_ENDPOINT_SIZE,
80 .bDescriptorType = USB_DT_ENDPOINT,
81 .bmAttributes = USB_ENDPOINT_XFER_BULK,
82 .wMaxPacketSize = cpu_to_le16(512),
83 };
84
85 static struct usb_endpoint_descriptor gser_hs_out_desc = {
86 .bLength = USB_DT_ENDPOINT_SIZE,
87 .bDescriptorType = USB_DT_ENDPOINT,
88 .bmAttributes = USB_ENDPOINT_XFER_BULK,
89 .wMaxPacketSize = cpu_to_le16(512),
90 };
91
92 static struct usb_descriptor_header *gser_hs_function[] = {
93 (struct usb_descriptor_header *) &gser_interface_desc,
94 (struct usb_descriptor_header *) &gser_hs_in_desc,
95 (struct usb_descriptor_header *) &gser_hs_out_desc,
96 NULL,
97 };
98
99 static struct usb_endpoint_descriptor gser_ss_in_desc = {
100 .bLength = USB_DT_ENDPOINT_SIZE,
101 .bDescriptorType = USB_DT_ENDPOINT,
102 .bmAttributes = USB_ENDPOINT_XFER_BULK,
103 .wMaxPacketSize = cpu_to_le16(1024),
104 };
105
106 static struct usb_endpoint_descriptor gser_ss_out_desc = {
107 .bLength = USB_DT_ENDPOINT_SIZE,
108 .bDescriptorType = USB_DT_ENDPOINT,
109 .bmAttributes = USB_ENDPOINT_XFER_BULK,
110 .wMaxPacketSize = cpu_to_le16(1024),
111 };
112
113 static struct usb_ss_ep_comp_descriptor gser_ss_bulk_comp_desc = {
114 .bLength = sizeof gser_ss_bulk_comp_desc,
115 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
116 };
117
118 static struct usb_descriptor_header *gser_ss_function[] = {
119 (struct usb_descriptor_header *) &gser_interface_desc,
120 (struct usb_descriptor_header *) &gser_ss_in_desc,
121 (struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
122 (struct usb_descriptor_header *) &gser_ss_out_desc,
123 (struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
124 NULL,
125 };
126
127
128
129 static struct usb_string gser_string_defs[] = {
130 [0].s = "Generic Serial",
131 { }
132 };
133
134 static struct usb_gadget_strings gser_string_table = {
135 .language = 0x0409,
136 .strings = gser_string_defs,
137 };
138
139 static struct usb_gadget_strings *gser_strings[] = {
140 &gser_string_table,
141 NULL,
142 };
143
144
145
146 static int gser_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
147 {
148 struct f_gser *gser = func_to_gser(f);
149 struct usb_composite_dev *cdev = f->config->cdev;
150
151
152
153 if (gser->port.in->enabled) {
154 dev_dbg(&cdev->gadget->dev,
155 "reset generic ttyGS%d\n", gser->port_num);
156 gserial_disconnect(&gser->port);
157 }
158 if (!gser->port.in->desc || !gser->port.out->desc) {
159 dev_dbg(&cdev->gadget->dev,
160 "activate generic ttyGS%d\n", gser->port_num);
161 if (config_ep_by_speed(cdev->gadget, f, gser->port.in) ||
162 config_ep_by_speed(cdev->gadget, f, gser->port.out)) {
163 gser->port.in->desc = NULL;
164 gser->port.out->desc = NULL;
165 return -EINVAL;
166 }
167 }
168 gserial_connect(&gser->port, gser->port_num);
169 return 0;
170 }
171
172 static void gser_disable(struct usb_function *f)
173 {
174 struct f_gser *gser = func_to_gser(f);
175 struct usb_composite_dev *cdev = f->config->cdev;
176
177 dev_dbg(&cdev->gadget->dev,
178 "generic ttyGS%d deactivated\n", gser->port_num);
179 gserial_disconnect(&gser->port);
180 }
181
182
183
184
185
186 static int gser_bind(struct usb_configuration *c, struct usb_function *f)
187 {
188 struct usb_composite_dev *cdev = c->cdev;
189 struct f_gser *gser = func_to_gser(f);
190 int status;
191 struct usb_ep *ep;
192
193
194
195
196
197
198 if (gser_string_defs[0].id == 0) {
199 status = usb_string_id(c->cdev);
200 if (status < 0)
201 return status;
202 gser_string_defs[0].id = status;
203 }
204
205
206 status = usb_interface_id(c, f);
207 if (status < 0)
208 goto fail;
209 gser->data_id = status;
210 gser_interface_desc.bInterfaceNumber = status;
211
212 status = -ENODEV;
213
214
215 ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_in_desc);
216 if (!ep)
217 goto fail;
218 gser->port.in = ep;
219
220 ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_out_desc);
221 if (!ep)
222 goto fail;
223 gser->port.out = ep;
224
225
226
227
228
229 gser_hs_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
230 gser_hs_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;
231
232 gser_ss_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
233 gser_ss_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;
234
235 status = usb_assign_descriptors(f, gser_fs_function, gser_hs_function,
236 gser_ss_function, NULL);
237 if (status)
238 goto fail;
239 dev_dbg(&cdev->gadget->dev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
240 gser->port_num,
241 gadget_is_superspeed(c->cdev->gadget) ? "super" :
242 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
243 gser->port.in->name, gser->port.out->name);
244 return 0;
245
246 fail:
247 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
248
249 return status;
250 }
251
252 static inline struct f_serial_opts *to_f_serial_opts(struct config_item *item)
253 {
254 return container_of(to_config_group(item), struct f_serial_opts,
255 func_inst.group);
256 }
257
258 static void serial_attr_release(struct config_item *item)
259 {
260 struct f_serial_opts *opts = to_f_serial_opts(item);
261
262 usb_put_function_instance(&opts->func_inst);
263 }
264
265 static struct configfs_item_operations serial_item_ops = {
266 .release = serial_attr_release,
267 };
268
269 static ssize_t f_serial_port_num_show(struct config_item *item, char *page)
270 {
271 return sprintf(page, "%u\n", to_f_serial_opts(item)->port_num);
272 }
273
274 CONFIGFS_ATTR_RO(f_serial_, port_num);
275
276 static struct configfs_attribute *acm_attrs[] = {
277 &f_serial_attr_port_num,
278 NULL,
279 };
280
281 static const struct config_item_type serial_func_type = {
282 .ct_item_ops = &serial_item_ops,
283 .ct_attrs = acm_attrs,
284 .ct_owner = THIS_MODULE,
285 };
286
287 static void gser_free_inst(struct usb_function_instance *f)
288 {
289 struct f_serial_opts *opts;
290
291 opts = container_of(f, struct f_serial_opts, func_inst);
292 gserial_free_line(opts->port_num);
293 kfree(opts);
294 }
295
296 static struct usb_function_instance *gser_alloc_inst(void)
297 {
298 struct f_serial_opts *opts;
299 int ret;
300
301 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
302 if (!opts)
303 return ERR_PTR(-ENOMEM);
304
305 opts->func_inst.free_func_inst = gser_free_inst;
306 ret = gserial_alloc_line(&opts->port_num);
307 if (ret) {
308 kfree(opts);
309 return ERR_PTR(ret);
310 }
311 config_group_init_type_name(&opts->func_inst.group, "",
312 &serial_func_type);
313
314 return &opts->func_inst;
315 }
316
317 static void gser_free(struct usb_function *f)
318 {
319 struct f_gser *serial;
320
321 serial = func_to_gser(f);
322 kfree(serial);
323 }
324
325 static void gser_unbind(struct usb_configuration *c, struct usb_function *f)
326 {
327 usb_free_all_descriptors(f);
328 }
329
330 static struct usb_function *gser_alloc(struct usb_function_instance *fi)
331 {
332 struct f_gser *gser;
333 struct f_serial_opts *opts;
334
335
336 gser = kzalloc(sizeof(*gser), GFP_KERNEL);
337 if (!gser)
338 return ERR_PTR(-ENOMEM);
339
340 opts = container_of(fi, struct f_serial_opts, func_inst);
341
342 gser->port_num = opts->port_num;
343
344 gser->port.func.name = "gser";
345 gser->port.func.strings = gser_strings;
346 gser->port.func.bind = gser_bind;
347 gser->port.func.unbind = gser_unbind;
348 gser->port.func.set_alt = gser_set_alt;
349 gser->port.func.disable = gser_disable;
350 gser->port.func.free_func = gser_free;
351
352 return &gser->port.func;
353 }
354
355 DECLARE_USB_FUNCTION_INIT(gser, gser_alloc_inst, gser_alloc);
356 MODULE_LICENSE("GPL");
357 MODULE_AUTHOR("Al Borchers");
358 MODULE_AUTHOR("David Brownell");