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[PATCH] USB: move <linux/usb_cdc.h> to <linux/usb/cdc.h>
[deliverable/linux.git] / drivers / usb / gadget / serial.c
1 /*
2 * g_serial.c -- USB gadget serial driver
3 *
4 * Copyright 2003 (C) Al Borchers (alborchers@steinerpoint.com)
5 *
6 * This code is based in part on the Gadget Zero driver, which
7 * is Copyright (C) 2003 by David Brownell, all rights reserved.
8 *
9 * This code also borrows from usbserial.c, which is
10 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
11 * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
12 * Copyright (C) 2000 Al Borchers (alborchers@steinerpoint.com)
13 *
14 * This software is distributed under the terms of the GNU General
15 * Public License ("GPL") as published by the Free Software Foundation,
16 * either version 2 of that License or (at your option) any later version.
17 *
18 */
19
20 #include <linux/config.h>
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/delay.h>
24 #include <linux/ioport.h>
25 #include <linux/sched.h>
26 #include <linux/slab.h>
27 #include <linux/smp_lock.h>
28 #include <linux/errno.h>
29 #include <linux/init.h>
30 #include <linux/timer.h>
31 #include <linux/list.h>
32 #include <linux/interrupt.h>
33 #include <linux/utsname.h>
34 #include <linux/wait.h>
35 #include <linux/proc_fs.h>
36 #include <linux/device.h>
37 #include <linux/tty.h>
38 #include <linux/tty_flip.h>
39
40 #include <asm/byteorder.h>
41 #include <asm/io.h>
42 #include <asm/irq.h>
43 #include <asm/system.h>
44 #include <asm/unaligned.h>
45 #include <asm/uaccess.h>
46
47 #include <linux/usb_ch9.h>
48 #include <linux/usb/cdc.h>
49 #include <linux/usb_gadget.h>
50
51 #include "gadget_chips.h"
52
53
54 /* Defines */
55
56 #define GS_VERSION_STR "v2.2"
57 #define GS_VERSION_NUM 0x0202
58
59 #define GS_LONG_NAME "Gadget Serial"
60 #define GS_SHORT_NAME "g_serial"
61
62 #define GS_MAJOR 127
63 #define GS_MINOR_START 0
64
65 #define GS_NUM_PORTS 16
66
67 #define GS_NUM_CONFIGS 1
68 #define GS_NO_CONFIG_ID 0
69 #define GS_BULK_CONFIG_ID 1
70 #define GS_ACM_CONFIG_ID 2
71
72 #define GS_MAX_NUM_INTERFACES 2
73 #define GS_BULK_INTERFACE_ID 0
74 #define GS_CONTROL_INTERFACE_ID 0
75 #define GS_DATA_INTERFACE_ID 1
76
77 #define GS_MAX_DESC_LEN 256
78
79 #define GS_DEFAULT_READ_Q_SIZE 32
80 #define GS_DEFAULT_WRITE_Q_SIZE 32
81
82 #define GS_DEFAULT_WRITE_BUF_SIZE 8192
83 #define GS_TMP_BUF_SIZE 8192
84
85 #define GS_CLOSE_TIMEOUT 15
86
87 #define GS_DEFAULT_USE_ACM 0
88
89 #define GS_DEFAULT_DTE_RATE 9600
90 #define GS_DEFAULT_DATA_BITS 8
91 #define GS_DEFAULT_PARITY USB_CDC_NO_PARITY
92 #define GS_DEFAULT_CHAR_FORMAT USB_CDC_1_STOP_BITS
93
94 /* select highspeed/fullspeed, hiding highspeed if not configured */
95 #ifdef CONFIG_USB_GADGET_DUALSPEED
96 #define GS_SPEED_SELECT(is_hs,hs,fs) ((is_hs) ? (hs) : (fs))
97 #else
98 #define GS_SPEED_SELECT(is_hs,hs,fs) (fs)
99 #endif /* CONFIG_USB_GADGET_DUALSPEED */
100
101 /* debug settings */
102 #ifdef GS_DEBUG
103 static int debug = 1;
104
105 #define gs_debug(format, arg...) \
106 do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
107 #define gs_debug_level(level, format, arg...) \
108 do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
109
110 #else
111
112 #define gs_debug(format, arg...) \
113 do { } while(0)
114 #define gs_debug_level(level, format, arg...) \
115 do { } while(0)
116
117 #endif /* GS_DEBUG */
118
119 /* Thanks to NetChip Technologies for donating this product ID.
120 *
121 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
122 * Instead: allocate your own, using normal USB-IF procedures.
123 */
124 #define GS_VENDOR_ID 0x0525 /* NetChip */
125 #define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
126 #define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
127
128 #define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
129 #define GS_NOTIFY_MAXPACKET 8
130
131
132 /* Structures */
133
134 struct gs_dev;
135
136 /* circular buffer */
137 struct gs_buf {
138 unsigned int buf_size;
139 char *buf_buf;
140 char *buf_get;
141 char *buf_put;
142 };
143
144 /* list of requests */
145 struct gs_req_entry {
146 struct list_head re_entry;
147 struct usb_request *re_req;
148 };
149
150 /* the port structure holds info for each port, one for each minor number */
151 struct gs_port {
152 struct gs_dev *port_dev; /* pointer to device struct */
153 struct tty_struct *port_tty; /* pointer to tty struct */
154 spinlock_t port_lock;
155 int port_num;
156 int port_open_count;
157 int port_in_use; /* open/close in progress */
158 wait_queue_head_t port_write_wait;/* waiting to write */
159 struct gs_buf *port_write_buf;
160 struct usb_cdc_line_coding port_line_coding;
161 };
162
163 /* the device structure holds info for the USB device */
164 struct gs_dev {
165 struct usb_gadget *dev_gadget; /* gadget device pointer */
166 spinlock_t dev_lock; /* lock for set/reset config */
167 int dev_config; /* configuration number */
168 struct usb_ep *dev_notify_ep; /* address of notify endpoint */
169 struct usb_ep *dev_in_ep; /* address of in endpoint */
170 struct usb_ep *dev_out_ep; /* address of out endpoint */
171 struct usb_endpoint_descriptor /* descriptor of notify ep */
172 *dev_notify_ep_desc;
173 struct usb_endpoint_descriptor /* descriptor of in endpoint */
174 *dev_in_ep_desc;
175 struct usb_endpoint_descriptor /* descriptor of out endpoint */
176 *dev_out_ep_desc;
177 struct usb_request *dev_ctrl_req; /* control request */
178 struct list_head dev_req_list; /* list of write requests */
179 int dev_sched_port; /* round robin port scheduled */
180 struct gs_port *dev_port[GS_NUM_PORTS]; /* the ports */
181 };
182
183
184 /* Functions */
185
186 /* module */
187 static int __init gs_module_init(void);
188 static void __exit gs_module_exit(void);
189
190 /* tty driver */
191 static int gs_open(struct tty_struct *tty, struct file *file);
192 static void gs_close(struct tty_struct *tty, struct file *file);
193 static int gs_write(struct tty_struct *tty,
194 const unsigned char *buf, int count);
195 static void gs_put_char(struct tty_struct *tty, unsigned char ch);
196 static void gs_flush_chars(struct tty_struct *tty);
197 static int gs_write_room(struct tty_struct *tty);
198 static int gs_chars_in_buffer(struct tty_struct *tty);
199 static void gs_throttle(struct tty_struct * tty);
200 static void gs_unthrottle(struct tty_struct * tty);
201 static void gs_break(struct tty_struct *tty, int break_state);
202 static int gs_ioctl(struct tty_struct *tty, struct file *file,
203 unsigned int cmd, unsigned long arg);
204 static void gs_set_termios(struct tty_struct *tty, struct termios *old);
205
206 static int gs_send(struct gs_dev *dev);
207 static int gs_send_packet(struct gs_dev *dev, char *packet,
208 unsigned int size);
209 static int gs_recv_packet(struct gs_dev *dev, char *packet,
210 unsigned int size);
211 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
212 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
213
214 /* gadget driver */
215 static int gs_bind(struct usb_gadget *gadget);
216 static void gs_unbind(struct usb_gadget *gadget);
217 static int gs_setup(struct usb_gadget *gadget,
218 const struct usb_ctrlrequest *ctrl);
219 static int gs_setup_standard(struct usb_gadget *gadget,
220 const struct usb_ctrlrequest *ctrl);
221 static int gs_setup_class(struct usb_gadget *gadget,
222 const struct usb_ctrlrequest *ctrl);
223 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
224 static void gs_disconnect(struct usb_gadget *gadget);
225 static int gs_set_config(struct gs_dev *dev, unsigned config);
226 static void gs_reset_config(struct gs_dev *dev);
227 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
228 u8 type, unsigned int index, int is_otg);
229
230 static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
231 gfp_t kmalloc_flags);
232 static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
233
234 static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
235 gfp_t kmalloc_flags);
236 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
237
238 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
239 static void gs_free_ports(struct gs_dev *dev);
240
241 /* circular buffer */
242 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
243 static void gs_buf_free(struct gs_buf *gb);
244 static void gs_buf_clear(struct gs_buf *gb);
245 static unsigned int gs_buf_data_avail(struct gs_buf *gb);
246 static unsigned int gs_buf_space_avail(struct gs_buf *gb);
247 static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
248 unsigned int count);
249 static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
250 unsigned int count);
251
252 /* external functions */
253 extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
254
255
256 /* Globals */
257
258 static struct gs_dev *gs_device;
259
260 static const char *EP_IN_NAME;
261 static const char *EP_OUT_NAME;
262 static const char *EP_NOTIFY_NAME;
263
264 static struct semaphore gs_open_close_sem[GS_NUM_PORTS];
265
266 static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
267 static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
268
269 static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
270
271 static unsigned int use_acm = GS_DEFAULT_USE_ACM;
272
273
274 /* tty driver struct */
275 static struct tty_operations gs_tty_ops = {
276 .open = gs_open,
277 .close = gs_close,
278 .write = gs_write,
279 .put_char = gs_put_char,
280 .flush_chars = gs_flush_chars,
281 .write_room = gs_write_room,
282 .ioctl = gs_ioctl,
283 .set_termios = gs_set_termios,
284 .throttle = gs_throttle,
285 .unthrottle = gs_unthrottle,
286 .break_ctl = gs_break,
287 .chars_in_buffer = gs_chars_in_buffer,
288 };
289 static struct tty_driver *gs_tty_driver;
290
291 /* gadget driver struct */
292 static struct usb_gadget_driver gs_gadget_driver = {
293 #ifdef CONFIG_USB_GADGET_DUALSPEED
294 .speed = USB_SPEED_HIGH,
295 #else
296 .speed = USB_SPEED_FULL,
297 #endif /* CONFIG_USB_GADGET_DUALSPEED */
298 .function = GS_LONG_NAME,
299 .bind = gs_bind,
300 .unbind = __exit_p(gs_unbind),
301 .setup = gs_setup,
302 .disconnect = gs_disconnect,
303 .driver = {
304 .name = GS_SHORT_NAME,
305 },
306 };
307
308
309 /* USB descriptors */
310
311 #define GS_MANUFACTURER_STR_ID 1
312 #define GS_PRODUCT_STR_ID 2
313 #define GS_SERIAL_STR_ID 3
314 #define GS_BULK_CONFIG_STR_ID 4
315 #define GS_ACM_CONFIG_STR_ID 5
316 #define GS_CONTROL_STR_ID 6
317 #define GS_DATA_STR_ID 7
318
319 /* static strings, in UTF-8 */
320 static char manufacturer[50];
321 static struct usb_string gs_strings[] = {
322 { GS_MANUFACTURER_STR_ID, manufacturer },
323 { GS_PRODUCT_STR_ID, GS_LONG_NAME },
324 { GS_SERIAL_STR_ID, "0" },
325 { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
326 { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
327 { GS_CONTROL_STR_ID, "Gadget Serial Control" },
328 { GS_DATA_STR_ID, "Gadget Serial Data" },
329 { } /* end of list */
330 };
331
332 static struct usb_gadget_strings gs_string_table = {
333 .language = 0x0409, /* en-us */
334 .strings = gs_strings,
335 };
336
337 static struct usb_device_descriptor gs_device_desc = {
338 .bLength = USB_DT_DEVICE_SIZE,
339 .bDescriptorType = USB_DT_DEVICE,
340 .bcdUSB = __constant_cpu_to_le16(0x0200),
341 .bDeviceSubClass = 0,
342 .bDeviceProtocol = 0,
343 .idVendor = __constant_cpu_to_le16(GS_VENDOR_ID),
344 .idProduct = __constant_cpu_to_le16(GS_PRODUCT_ID),
345 .iManufacturer = GS_MANUFACTURER_STR_ID,
346 .iProduct = GS_PRODUCT_STR_ID,
347 .iSerialNumber = GS_SERIAL_STR_ID,
348 .bNumConfigurations = GS_NUM_CONFIGS,
349 };
350
351 static struct usb_otg_descriptor gs_otg_descriptor = {
352 .bLength = sizeof(gs_otg_descriptor),
353 .bDescriptorType = USB_DT_OTG,
354 .bmAttributes = USB_OTG_SRP,
355 };
356
357 static struct usb_config_descriptor gs_bulk_config_desc = {
358 .bLength = USB_DT_CONFIG_SIZE,
359 .bDescriptorType = USB_DT_CONFIG,
360 /* .wTotalLength computed dynamically */
361 .bNumInterfaces = 1,
362 .bConfigurationValue = GS_BULK_CONFIG_ID,
363 .iConfiguration = GS_BULK_CONFIG_STR_ID,
364 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
365 .bMaxPower = 1,
366 };
367
368 static struct usb_config_descriptor gs_acm_config_desc = {
369 .bLength = USB_DT_CONFIG_SIZE,
370 .bDescriptorType = USB_DT_CONFIG,
371 /* .wTotalLength computed dynamically */
372 .bNumInterfaces = 2,
373 .bConfigurationValue = GS_ACM_CONFIG_ID,
374 .iConfiguration = GS_ACM_CONFIG_STR_ID,
375 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
376 .bMaxPower = 1,
377 };
378
379 static const struct usb_interface_descriptor gs_bulk_interface_desc = {
380 .bLength = USB_DT_INTERFACE_SIZE,
381 .bDescriptorType = USB_DT_INTERFACE,
382 .bInterfaceNumber = GS_BULK_INTERFACE_ID,
383 .bNumEndpoints = 2,
384 .bInterfaceClass = USB_CLASS_CDC_DATA,
385 .bInterfaceSubClass = 0,
386 .bInterfaceProtocol = 0,
387 .iInterface = GS_DATA_STR_ID,
388 };
389
390 static const struct usb_interface_descriptor gs_control_interface_desc = {
391 .bLength = USB_DT_INTERFACE_SIZE,
392 .bDescriptorType = USB_DT_INTERFACE,
393 .bInterfaceNumber = GS_CONTROL_INTERFACE_ID,
394 .bNumEndpoints = 1,
395 .bInterfaceClass = USB_CLASS_COMM,
396 .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
397 .bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
398 .iInterface = GS_CONTROL_STR_ID,
399 };
400
401 static const struct usb_interface_descriptor gs_data_interface_desc = {
402 .bLength = USB_DT_INTERFACE_SIZE,
403 .bDescriptorType = USB_DT_INTERFACE,
404 .bInterfaceNumber = GS_DATA_INTERFACE_ID,
405 .bNumEndpoints = 2,
406 .bInterfaceClass = USB_CLASS_CDC_DATA,
407 .bInterfaceSubClass = 0,
408 .bInterfaceProtocol = 0,
409 .iInterface = GS_DATA_STR_ID,
410 };
411
412 static const struct usb_cdc_header_desc gs_header_desc = {
413 .bLength = sizeof(gs_header_desc),
414 .bDescriptorType = USB_DT_CS_INTERFACE,
415 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
416 .bcdCDC = __constant_cpu_to_le16(0x0110),
417 };
418
419 static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
420 .bLength = sizeof(gs_call_mgmt_descriptor),
421 .bDescriptorType = USB_DT_CS_INTERFACE,
422 .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
423 .bmCapabilities = 0,
424 .bDataInterface = 1, /* index of data interface */
425 };
426
427 static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
428 .bLength = sizeof(gs_acm_descriptor),
429 .bDescriptorType = USB_DT_CS_INTERFACE,
430 .bDescriptorSubType = USB_CDC_ACM_TYPE,
431 .bmCapabilities = 0,
432 };
433
434 static const struct usb_cdc_union_desc gs_union_desc = {
435 .bLength = sizeof(gs_union_desc),
436 .bDescriptorType = USB_DT_CS_INTERFACE,
437 .bDescriptorSubType = USB_CDC_UNION_TYPE,
438 .bMasterInterface0 = 0, /* index of control interface */
439 .bSlaveInterface0 = 1, /* index of data interface */
440 };
441
442 static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
443 .bLength = USB_DT_ENDPOINT_SIZE,
444 .bDescriptorType = USB_DT_ENDPOINT,
445 .bEndpointAddress = USB_DIR_IN,
446 .bmAttributes = USB_ENDPOINT_XFER_INT,
447 .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
448 .bInterval = 1 << GS_LOG2_NOTIFY_INTERVAL,
449 };
450
451 static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
452 .bLength = USB_DT_ENDPOINT_SIZE,
453 .bDescriptorType = USB_DT_ENDPOINT,
454 .bEndpointAddress = USB_DIR_IN,
455 .bmAttributes = USB_ENDPOINT_XFER_BULK,
456 };
457
458 static struct usb_endpoint_descriptor gs_fullspeed_out_desc = {
459 .bLength = USB_DT_ENDPOINT_SIZE,
460 .bDescriptorType = USB_DT_ENDPOINT,
461 .bEndpointAddress = USB_DIR_OUT,
462 .bmAttributes = USB_ENDPOINT_XFER_BULK,
463 };
464
465 static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
466 (struct usb_descriptor_header *) &gs_otg_descriptor,
467 (struct usb_descriptor_header *) &gs_bulk_interface_desc,
468 (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
469 (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
470 NULL,
471 };
472
473 static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
474 (struct usb_descriptor_header *) &gs_otg_descriptor,
475 (struct usb_descriptor_header *) &gs_control_interface_desc,
476 (struct usb_descriptor_header *) &gs_header_desc,
477 (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
478 (struct usb_descriptor_header *) &gs_acm_descriptor,
479 (struct usb_descriptor_header *) &gs_union_desc,
480 (struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
481 (struct usb_descriptor_header *) &gs_data_interface_desc,
482 (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
483 (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
484 NULL,
485 };
486
487 #ifdef CONFIG_USB_GADGET_DUALSPEED
488 static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
489 .bLength = USB_DT_ENDPOINT_SIZE,
490 .bDescriptorType = USB_DT_ENDPOINT,
491 .bEndpointAddress = USB_DIR_IN,
492 .bmAttributes = USB_ENDPOINT_XFER_INT,
493 .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
494 .bInterval = GS_LOG2_NOTIFY_INTERVAL+4,
495 };
496
497 static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
498 .bLength = USB_DT_ENDPOINT_SIZE,
499 .bDescriptorType = USB_DT_ENDPOINT,
500 .bmAttributes = USB_ENDPOINT_XFER_BULK,
501 .wMaxPacketSize = __constant_cpu_to_le16(512),
502 };
503
504 static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
505 .bLength = USB_DT_ENDPOINT_SIZE,
506 .bDescriptorType = USB_DT_ENDPOINT,
507 .bmAttributes = USB_ENDPOINT_XFER_BULK,
508 .wMaxPacketSize = __constant_cpu_to_le16(512),
509 };
510
511 static struct usb_qualifier_descriptor gs_qualifier_desc = {
512 .bLength = sizeof(struct usb_qualifier_descriptor),
513 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
514 .bcdUSB = __constant_cpu_to_le16 (0x0200),
515 /* assumes ep0 uses the same value for both speeds ... */
516 .bNumConfigurations = GS_NUM_CONFIGS,
517 };
518
519 static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
520 (struct usb_descriptor_header *) &gs_otg_descriptor,
521 (struct usb_descriptor_header *) &gs_bulk_interface_desc,
522 (struct usb_descriptor_header *) &gs_highspeed_in_desc,
523 (struct usb_descriptor_header *) &gs_highspeed_out_desc,
524 NULL,
525 };
526
527 static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
528 (struct usb_descriptor_header *) &gs_otg_descriptor,
529 (struct usb_descriptor_header *) &gs_control_interface_desc,
530 (struct usb_descriptor_header *) &gs_header_desc,
531 (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
532 (struct usb_descriptor_header *) &gs_acm_descriptor,
533 (struct usb_descriptor_header *) &gs_union_desc,
534 (struct usb_descriptor_header *) &gs_highspeed_notify_desc,
535 (struct usb_descriptor_header *) &gs_data_interface_desc,
536 (struct usb_descriptor_header *) &gs_highspeed_in_desc,
537 (struct usb_descriptor_header *) &gs_highspeed_out_desc,
538 NULL,
539 };
540
541 #endif /* CONFIG_USB_GADGET_DUALSPEED */
542
543
544 /* Module */
545 MODULE_DESCRIPTION(GS_LONG_NAME);
546 MODULE_AUTHOR("Al Borchers");
547 MODULE_LICENSE("GPL");
548
549 #ifdef GS_DEBUG
550 module_param(debug, int, S_IRUGO|S_IWUSR);
551 MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
552 #endif
553
554 module_param(read_q_size, uint, S_IRUGO);
555 MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
556
557 module_param(write_q_size, uint, S_IRUGO);
558 MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
559
560 module_param(write_buf_size, uint, S_IRUGO);
561 MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
562
563 module_param(use_acm, uint, S_IRUGO);
564 MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
565
566 module_init(gs_module_init);
567 module_exit(gs_module_exit);
568
569 /*
570 * gs_module_init
571 *
572 * Register as a USB gadget driver and a tty driver.
573 */
574 static int __init gs_module_init(void)
575 {
576 int i;
577 int retval;
578
579 retval = usb_gadget_register_driver(&gs_gadget_driver);
580 if (retval) {
581 printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
582 return retval;
583 }
584
585 gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
586 if (!gs_tty_driver)
587 return -ENOMEM;
588 gs_tty_driver->owner = THIS_MODULE;
589 gs_tty_driver->driver_name = GS_SHORT_NAME;
590 gs_tty_driver->name = "ttygs";
591 gs_tty_driver->devfs_name = "usb/ttygs/";
592 gs_tty_driver->major = GS_MAJOR;
593 gs_tty_driver->minor_start = GS_MINOR_START;
594 gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
595 gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
596 gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
597 gs_tty_driver->init_termios = tty_std_termios;
598 gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
599 tty_set_operations(gs_tty_driver, &gs_tty_ops);
600
601 for (i=0; i < GS_NUM_PORTS; i++)
602 sema_init(&gs_open_close_sem[i], 1);
603
604 retval = tty_register_driver(gs_tty_driver);
605 if (retval) {
606 usb_gadget_unregister_driver(&gs_gadget_driver);
607 put_tty_driver(gs_tty_driver);
608 printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
609 return retval;
610 }
611
612 printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
613 return 0;
614 }
615
616 /*
617 * gs_module_exit
618 *
619 * Unregister as a tty driver and a USB gadget driver.
620 */
621 static void __exit gs_module_exit(void)
622 {
623 tty_unregister_driver(gs_tty_driver);
624 put_tty_driver(gs_tty_driver);
625 usb_gadget_unregister_driver(&gs_gadget_driver);
626
627 printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
628 }
629
630 /* TTY Driver */
631
632 /*
633 * gs_open
634 */
635 static int gs_open(struct tty_struct *tty, struct file *file)
636 {
637 int port_num;
638 unsigned long flags;
639 struct gs_port *port;
640 struct gs_dev *dev;
641 struct gs_buf *buf;
642 struct semaphore *sem;
643 int ret;
644
645 port_num = tty->index;
646
647 gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
648
649 if (port_num < 0 || port_num >= GS_NUM_PORTS) {
650 printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
651 port_num, tty, file);
652 return -ENODEV;
653 }
654
655 dev = gs_device;
656
657 if (dev == NULL) {
658 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
659 port_num, tty, file);
660 return -ENODEV;
661 }
662
663 sem = &gs_open_close_sem[port_num];
664 if (down_interruptible(sem)) {
665 printk(KERN_ERR
666 "gs_open: (%d,%p,%p) interrupted waiting for semaphore\n",
667 port_num, tty, file);
668 return -ERESTARTSYS;
669 }
670
671 spin_lock_irqsave(&dev->dev_lock, flags);
672
673 if (dev->dev_config == GS_NO_CONFIG_ID) {
674 printk(KERN_ERR
675 "gs_open: (%d,%p,%p) device is not connected\n",
676 port_num, tty, file);
677 ret = -ENODEV;
678 goto exit_unlock_dev;
679 }
680
681 port = dev->dev_port[port_num];
682
683 if (port == NULL) {
684 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
685 port_num, tty, file);
686 ret = -ENODEV;
687 goto exit_unlock_dev;
688 }
689
690 spin_lock(&port->port_lock);
691 spin_unlock(&dev->dev_lock);
692
693 if (port->port_dev == NULL) {
694 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
695 port_num, tty, file);
696 ret = -EIO;
697 goto exit_unlock_port;
698 }
699
700 if (port->port_open_count > 0) {
701 ++port->port_open_count;
702 gs_debug("gs_open: (%d,%p,%p) already open\n",
703 port_num, tty, file);
704 ret = 0;
705 goto exit_unlock_port;
706 }
707
708 tty->driver_data = NULL;
709
710 /* mark port as in use, we can drop port lock and sleep if necessary */
711 port->port_in_use = 1;
712
713 /* allocate write buffer on first open */
714 if (port->port_write_buf == NULL) {
715 spin_unlock_irqrestore(&port->port_lock, flags);
716 buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
717 spin_lock_irqsave(&port->port_lock, flags);
718
719 /* might have been disconnected while asleep, check */
720 if (port->port_dev == NULL) {
721 printk(KERN_ERR
722 "gs_open: (%d,%p,%p) port disconnected (2)\n",
723 port_num, tty, file);
724 port->port_in_use = 0;
725 ret = -EIO;
726 goto exit_unlock_port;
727 }
728
729 if ((port->port_write_buf=buf) == NULL) {
730 printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
731 port_num, tty, file);
732 port->port_in_use = 0;
733 ret = -ENOMEM;
734 goto exit_unlock_port;
735 }
736
737 }
738
739 /* wait for carrier detect (not implemented) */
740
741 /* might have been disconnected while asleep, check */
742 if (port->port_dev == NULL) {
743 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
744 port_num, tty, file);
745 port->port_in_use = 0;
746 ret = -EIO;
747 goto exit_unlock_port;
748 }
749
750 tty->driver_data = port;
751 port->port_tty = tty;
752 port->port_open_count = 1;
753 port->port_in_use = 0;
754
755 gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
756
757 ret = 0;
758
759 exit_unlock_port:
760 spin_unlock_irqrestore(&port->port_lock, flags);
761 up(sem);
762 return ret;
763
764 exit_unlock_dev:
765 spin_unlock_irqrestore(&dev->dev_lock, flags);
766 up(sem);
767 return ret;
768
769 }
770
771 /*
772 * gs_close
773 */
774
775 #define GS_WRITE_FINISHED_EVENT_SAFELY(p) \
776 ({ \
777 int cond; \
778 \
779 spin_lock_irq(&(p)->port_lock); \
780 cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); \
781 spin_unlock_irq(&(p)->port_lock); \
782 cond; \
783 })
784
785 static void gs_close(struct tty_struct *tty, struct file *file)
786 {
787 struct gs_port *port = tty->driver_data;
788 struct semaphore *sem;
789
790 if (port == NULL) {
791 printk(KERN_ERR "gs_close: NULL port pointer\n");
792 return;
793 }
794
795 gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
796
797 sem = &gs_open_close_sem[port->port_num];
798 down(sem);
799
800 spin_lock_irq(&port->port_lock);
801
802 if (port->port_open_count == 0) {
803 printk(KERN_ERR
804 "gs_close: (%d,%p,%p) port is already closed\n",
805 port->port_num, tty, file);
806 goto exit;
807 }
808
809 if (port->port_open_count > 1) {
810 --port->port_open_count;
811 goto exit;
812 }
813
814 /* free disconnected port on final close */
815 if (port->port_dev == NULL) {
816 kfree(port);
817 goto exit;
818 }
819
820 /* mark port as closed but in use, we can drop port lock */
821 /* and sleep if necessary */
822 port->port_in_use = 1;
823 port->port_open_count = 0;
824
825 /* wait for write buffer to drain, or */
826 /* at most GS_CLOSE_TIMEOUT seconds */
827 if (gs_buf_data_avail(port->port_write_buf) > 0) {
828 spin_unlock_irq(&port->port_lock);
829 wait_event_interruptible_timeout(port->port_write_wait,
830 GS_WRITE_FINISHED_EVENT_SAFELY(port),
831 GS_CLOSE_TIMEOUT * HZ);
832 spin_lock_irq(&port->port_lock);
833 }
834
835 /* free disconnected port on final close */
836 /* (might have happened during the above sleep) */
837 if (port->port_dev == NULL) {
838 kfree(port);
839 goto exit;
840 }
841
842 gs_buf_clear(port->port_write_buf);
843
844 tty->driver_data = NULL;
845 port->port_tty = NULL;
846 port->port_in_use = 0;
847
848 gs_debug("gs_close: (%d,%p,%p) completed\n",
849 port->port_num, tty, file);
850
851 exit:
852 spin_unlock_irq(&port->port_lock);
853 up(sem);
854 }
855
856 /*
857 * gs_write
858 */
859 static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
860 {
861 unsigned long flags;
862 struct gs_port *port = tty->driver_data;
863 int ret;
864
865 if (port == NULL) {
866 printk(KERN_ERR "gs_write: NULL port pointer\n");
867 return -EIO;
868 }
869
870 gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
871 count);
872
873 if (count == 0)
874 return 0;
875
876 spin_lock_irqsave(&port->port_lock, flags);
877
878 if (port->port_dev == NULL) {
879 printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
880 port->port_num, tty);
881 ret = -EIO;
882 goto exit;
883 }
884
885 if (port->port_open_count == 0) {
886 printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
887 port->port_num, tty);
888 ret = -EBADF;
889 goto exit;
890 }
891
892 count = gs_buf_put(port->port_write_buf, buf, count);
893
894 spin_unlock_irqrestore(&port->port_lock, flags);
895
896 gs_send(gs_device);
897
898 gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
899 count);
900
901 return count;
902
903 exit:
904 spin_unlock_irqrestore(&port->port_lock, flags);
905 return ret;
906 }
907
908 /*
909 * gs_put_char
910 */
911 static void gs_put_char(struct tty_struct *tty, unsigned char ch)
912 {
913 unsigned long flags;
914 struct gs_port *port = tty->driver_data;
915
916 if (port == NULL) {
917 printk(KERN_ERR "gs_put_char: NULL port pointer\n");
918 return;
919 }
920
921 gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p, %p, %p\n", port->port_num, tty, ch, __builtin_return_address(0), __builtin_return_address(1), __builtin_return_address(2));
922
923 spin_lock_irqsave(&port->port_lock, flags);
924
925 if (port->port_dev == NULL) {
926 printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
927 port->port_num, tty);
928 goto exit;
929 }
930
931 if (port->port_open_count == 0) {
932 printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
933 port->port_num, tty);
934 goto exit;
935 }
936
937 gs_buf_put(port->port_write_buf, &ch, 1);
938
939 exit:
940 spin_unlock_irqrestore(&port->port_lock, flags);
941 }
942
943 /*
944 * gs_flush_chars
945 */
946 static void gs_flush_chars(struct tty_struct *tty)
947 {
948 unsigned long flags;
949 struct gs_port *port = tty->driver_data;
950
951 if (port == NULL) {
952 printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
953 return;
954 }
955
956 gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
957
958 spin_lock_irqsave(&port->port_lock, flags);
959
960 if (port->port_dev == NULL) {
961 printk(KERN_ERR
962 "gs_flush_chars: (%d,%p) port is not connected\n",
963 port->port_num, tty);
964 goto exit;
965 }
966
967 if (port->port_open_count == 0) {
968 printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
969 port->port_num, tty);
970 goto exit;
971 }
972
973 spin_unlock_irqrestore(&port->port_lock, flags);
974
975 gs_send(gs_device);
976
977 return;
978
979 exit:
980 spin_unlock_irqrestore(&port->port_lock, flags);
981 }
982
983 /*
984 * gs_write_room
985 */
986 static int gs_write_room(struct tty_struct *tty)
987 {
988
989 int room = 0;
990 unsigned long flags;
991 struct gs_port *port = tty->driver_data;
992
993
994 if (port == NULL)
995 return 0;
996
997 spin_lock_irqsave(&port->port_lock, flags);
998
999 if (port->port_dev != NULL && port->port_open_count > 0
1000 && port->port_write_buf != NULL)
1001 room = gs_buf_space_avail(port->port_write_buf);
1002
1003 spin_unlock_irqrestore(&port->port_lock, flags);
1004
1005 gs_debug("gs_write_room: (%d,%p) room=%d\n",
1006 port->port_num, tty, room);
1007
1008 return room;
1009 }
1010
1011 /*
1012 * gs_chars_in_buffer
1013 */
1014 static int gs_chars_in_buffer(struct tty_struct *tty)
1015 {
1016 int chars = 0;
1017 unsigned long flags;
1018 struct gs_port *port = tty->driver_data;
1019
1020 if (port == NULL)
1021 return 0;
1022
1023 spin_lock_irqsave(&port->port_lock, flags);
1024
1025 if (port->port_dev != NULL && port->port_open_count > 0
1026 && port->port_write_buf != NULL)
1027 chars = gs_buf_data_avail(port->port_write_buf);
1028
1029 spin_unlock_irqrestore(&port->port_lock, flags);
1030
1031 gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
1032 port->port_num, tty, chars);
1033
1034 return chars;
1035 }
1036
1037 /*
1038 * gs_throttle
1039 */
1040 static void gs_throttle(struct tty_struct *tty)
1041 {
1042 }
1043
1044 /*
1045 * gs_unthrottle
1046 */
1047 static void gs_unthrottle(struct tty_struct *tty)
1048 {
1049 }
1050
1051 /*
1052 * gs_break
1053 */
1054 static void gs_break(struct tty_struct *tty, int break_state)
1055 {
1056 }
1057
1058 /*
1059 * gs_ioctl
1060 */
1061 static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1062 {
1063 struct gs_port *port = tty->driver_data;
1064
1065 if (port == NULL) {
1066 printk(KERN_ERR "gs_ioctl: NULL port pointer\n");
1067 return -EIO;
1068 }
1069
1070 gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
1071 port->port_num, tty, file, cmd, arg);
1072
1073 /* handle ioctls */
1074
1075 /* could not handle ioctl */
1076 return -ENOIOCTLCMD;
1077 }
1078
1079 /*
1080 * gs_set_termios
1081 */
1082 static void gs_set_termios(struct tty_struct *tty, struct termios *old)
1083 {
1084 }
1085
1086 /*
1087 * gs_send
1088 *
1089 * This function finds available write requests, calls
1090 * gs_send_packet to fill these packets with data, and
1091 * continues until either there are no more write requests
1092 * available or no more data to send. This function is
1093 * run whenever data arrives or write requests are available.
1094 */
1095 static int gs_send(struct gs_dev *dev)
1096 {
1097 int ret,len;
1098 unsigned long flags;
1099 struct usb_ep *ep;
1100 struct usb_request *req;
1101 struct gs_req_entry *req_entry;
1102
1103 if (dev == NULL) {
1104 printk(KERN_ERR "gs_send: NULL device pointer\n");
1105 return -ENODEV;
1106 }
1107
1108 spin_lock_irqsave(&dev->dev_lock, flags);
1109
1110 ep = dev->dev_in_ep;
1111
1112 while(!list_empty(&dev->dev_req_list)) {
1113
1114 req_entry = list_entry(dev->dev_req_list.next,
1115 struct gs_req_entry, re_entry);
1116
1117 req = req_entry->re_req;
1118
1119 len = gs_send_packet(dev, req->buf, ep->maxpacket);
1120
1121 if (len > 0) {
1122 gs_debug_level(3, "gs_send: len=%d, 0x%2.2x 0x%2.2x 0x%2.2x ...\n", len, *((unsigned char *)req->buf), *((unsigned char *)req->buf+1), *((unsigned char *)req->buf+2));
1123 list_del(&req_entry->re_entry);
1124 req->length = len;
1125 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1126 printk(KERN_ERR
1127 "gs_send: cannot queue read request, ret=%d\n",
1128 ret);
1129 break;
1130 }
1131 } else {
1132 break;
1133 }
1134
1135 }
1136
1137 spin_unlock_irqrestore(&dev->dev_lock, flags);
1138
1139 return 0;
1140 }
1141
1142 /*
1143 * gs_send_packet
1144 *
1145 * If there is data to send, a packet is built in the given
1146 * buffer and the size is returned. If there is no data to
1147 * send, 0 is returned. If there is any error a negative
1148 * error number is returned.
1149 *
1150 * Called during USB completion routine, on interrupt time.
1151 *
1152 * We assume that disconnect will not happen until all completion
1153 * routines have completed, so we can assume that the dev_port
1154 * array does not change during the lifetime of this function.
1155 */
1156 static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
1157 {
1158 unsigned int len;
1159 struct gs_port *port;
1160
1161 /* TEMPORARY -- only port 0 is supported right now */
1162 port = dev->dev_port[0];
1163
1164 if (port == NULL) {
1165 printk(KERN_ERR
1166 "gs_send_packet: port=%d, NULL port pointer\n",
1167 0);
1168 return -EIO;
1169 }
1170
1171 spin_lock(&port->port_lock);
1172
1173 len = gs_buf_data_avail(port->port_write_buf);
1174 if (len < size)
1175 size = len;
1176
1177 if (size == 0)
1178 goto exit;
1179
1180 size = gs_buf_get(port->port_write_buf, packet, size);
1181
1182 if (port->port_tty)
1183 wake_up_interruptible(&port->port_tty->write_wait);
1184
1185 exit:
1186 spin_unlock(&port->port_lock);
1187 return size;
1188 }
1189
1190 /*
1191 * gs_recv_packet
1192 *
1193 * Called for each USB packet received. Reads the packet
1194 * header and stuffs the data in the appropriate tty buffer.
1195 * Returns 0 if successful, or a negative error number.
1196 *
1197 * Called during USB completion routine, on interrupt time.
1198 *
1199 * We assume that disconnect will not happen until all completion
1200 * routines have completed, so we can assume that the dev_port
1201 * array does not change during the lifetime of this function.
1202 */
1203 static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
1204 {
1205 unsigned int len;
1206 struct gs_port *port;
1207 int ret;
1208 struct tty_struct *tty;
1209
1210 /* TEMPORARY -- only port 0 is supported right now */
1211 port = dev->dev_port[0];
1212
1213 if (port == NULL) {
1214 printk(KERN_ERR "gs_recv_packet: port=%d, NULL port pointer\n",
1215 port->port_num);
1216 return -EIO;
1217 }
1218
1219 spin_lock(&port->port_lock);
1220
1221 if (port->port_open_count == 0) {
1222 printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
1223 port->port_num);
1224 ret = -EIO;
1225 goto exit;
1226 }
1227
1228
1229 tty = port->port_tty;
1230
1231 if (tty == NULL) {
1232 printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
1233 port->port_num);
1234 ret = -EIO;
1235 goto exit;
1236 }
1237
1238 if (port->port_tty->magic != TTY_MAGIC) {
1239 printk(KERN_ERR "gs_recv_packet: port=%d, bad tty magic\n",
1240 port->port_num);
1241 ret = -EIO;
1242 goto exit;
1243 }
1244
1245 len = tty_buffer_request_room(tty, size);
1246 if (len > 0) {
1247 tty_insert_flip_string(tty, packet, len);
1248 tty_flip_buffer_push(port->port_tty);
1249 wake_up_interruptible(&port->port_tty->read_wait);
1250 }
1251 ret = 0;
1252 exit:
1253 spin_unlock(&port->port_lock);
1254 return ret;
1255 }
1256
1257 /*
1258 * gs_read_complete
1259 */
1260 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
1261 {
1262 int ret;
1263 struct gs_dev *dev = ep->driver_data;
1264
1265 if (dev == NULL) {
1266 printk(KERN_ERR "gs_read_complete: NULL device pointer\n");
1267 return;
1268 }
1269
1270 switch(req->status) {
1271 case 0:
1272 /* normal completion */
1273 gs_recv_packet(dev, req->buf, req->actual);
1274 requeue:
1275 req->length = ep->maxpacket;
1276 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1277 printk(KERN_ERR
1278 "gs_read_complete: cannot queue read request, ret=%d\n",
1279 ret);
1280 }
1281 break;
1282
1283 case -ESHUTDOWN:
1284 /* disconnect */
1285 gs_debug("gs_read_complete: shutdown\n");
1286 gs_free_req(ep, req);
1287 break;
1288
1289 default:
1290 /* unexpected */
1291 printk(KERN_ERR
1292 "gs_read_complete: unexpected status error, status=%d\n",
1293 req->status);
1294 goto requeue;
1295 break;
1296 }
1297 }
1298
1299 /*
1300 * gs_write_complete
1301 */
1302 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
1303 {
1304 struct gs_dev *dev = ep->driver_data;
1305 struct gs_req_entry *gs_req = req->context;
1306
1307 if (dev == NULL) {
1308 printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
1309 return;
1310 }
1311
1312 switch(req->status) {
1313 case 0:
1314 /* normal completion */
1315 requeue:
1316 if (gs_req == NULL) {
1317 printk(KERN_ERR
1318 "gs_write_complete: NULL request pointer\n");
1319 return;
1320 }
1321
1322 spin_lock(&dev->dev_lock);
1323 list_add(&gs_req->re_entry, &dev->dev_req_list);
1324 spin_unlock(&dev->dev_lock);
1325
1326 gs_send(dev);
1327
1328 break;
1329
1330 case -ESHUTDOWN:
1331 /* disconnect */
1332 gs_debug("gs_write_complete: shutdown\n");
1333 gs_free_req(ep, req);
1334 break;
1335
1336 default:
1337 printk(KERN_ERR
1338 "gs_write_complete: unexpected status error, status=%d\n",
1339 req->status);
1340 goto requeue;
1341 break;
1342 }
1343 }
1344
1345 /* Gadget Driver */
1346
1347 /*
1348 * gs_bind
1349 *
1350 * Called on module load. Allocates and initializes the device
1351 * structure and a control request.
1352 */
1353 static int __init gs_bind(struct usb_gadget *gadget)
1354 {
1355 int ret;
1356 struct usb_ep *ep;
1357 struct gs_dev *dev;
1358 int gcnum;
1359
1360 /* Some controllers can't support CDC ACM:
1361 * - sh doesn't support multiple interfaces or configs;
1362 * - sa1100 doesn't have a third interrupt endpoint
1363 */
1364 if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
1365 use_acm = 0;
1366
1367 gcnum = usb_gadget_controller_number(gadget);
1368 if (gcnum >= 0)
1369 gs_device_desc.bcdDevice =
1370 cpu_to_le16(GS_VERSION_NUM | gcnum);
1371 else {
1372 printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
1373 gadget->name);
1374 /* unrecognized, but safe unless bulk is REALLY quirky */
1375 gs_device_desc.bcdDevice =
1376 __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
1377 }
1378
1379 usb_ep_autoconfig_reset(gadget);
1380
1381 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1382 if (!ep)
1383 goto autoconf_fail;
1384 EP_IN_NAME = ep->name;
1385 ep->driver_data = ep; /* claim the endpoint */
1386
1387 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1388 if (!ep)
1389 goto autoconf_fail;
1390 EP_OUT_NAME = ep->name;
1391 ep->driver_data = ep; /* claim the endpoint */
1392
1393 if (use_acm) {
1394 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
1395 if (!ep) {
1396 printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
1397 goto autoconf_fail;
1398 }
1399 gs_device_desc.idProduct = __constant_cpu_to_le16(
1400 GS_CDC_PRODUCT_ID),
1401 EP_NOTIFY_NAME = ep->name;
1402 ep->driver_data = ep; /* claim the endpoint */
1403 }
1404
1405 gs_device_desc.bDeviceClass = use_acm
1406 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1407 gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1408
1409 #ifdef CONFIG_USB_GADGET_DUALSPEED
1410 gs_qualifier_desc.bDeviceClass = use_acm
1411 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1412 /* assume ep0 uses the same packet size for both speeds */
1413 gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
1414 /* assume endpoints are dual-speed */
1415 gs_highspeed_notify_desc.bEndpointAddress =
1416 gs_fullspeed_notify_desc.bEndpointAddress;
1417 gs_highspeed_in_desc.bEndpointAddress =
1418 gs_fullspeed_in_desc.bEndpointAddress;
1419 gs_highspeed_out_desc.bEndpointAddress =
1420 gs_fullspeed_out_desc.bEndpointAddress;
1421 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1422
1423 usb_gadget_set_selfpowered(gadget);
1424
1425 if (gadget->is_otg) {
1426 gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
1427 gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1428 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1429 }
1430
1431 gs_device = dev = kmalloc(sizeof(struct gs_dev), GFP_KERNEL);
1432 if (dev == NULL)
1433 return -ENOMEM;
1434
1435 snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1436 system_utsname.sysname, system_utsname.release,
1437 gadget->name);
1438
1439 memset(dev, 0, sizeof(struct gs_dev));
1440 dev->dev_gadget = gadget;
1441 spin_lock_init(&dev->dev_lock);
1442 INIT_LIST_HEAD(&dev->dev_req_list);
1443 set_gadget_data(gadget, dev);
1444
1445 if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1446 printk(KERN_ERR "gs_bind: cannot allocate ports\n");
1447 gs_unbind(gadget);
1448 return ret;
1449 }
1450
1451 /* preallocate control response and buffer */
1452 dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1453 GFP_KERNEL);
1454 if (dev->dev_ctrl_req == NULL) {
1455 gs_unbind(gadget);
1456 return -ENOMEM;
1457 }
1458 dev->dev_ctrl_req->complete = gs_setup_complete;
1459
1460 gadget->ep0->driver_data = dev;
1461
1462 printk(KERN_INFO "gs_bind: %s %s bound\n",
1463 GS_LONG_NAME, GS_VERSION_STR);
1464
1465 return 0;
1466
1467 autoconf_fail:
1468 printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
1469 return -ENODEV;
1470 }
1471
1472 /*
1473 * gs_unbind
1474 *
1475 * Called on module unload. Frees the control request and device
1476 * structure.
1477 */
1478 static void __exit gs_unbind(struct usb_gadget *gadget)
1479 {
1480 struct gs_dev *dev = get_gadget_data(gadget);
1481
1482 gs_device = NULL;
1483
1484 /* read/write requests already freed, only control request remains */
1485 if (dev != NULL) {
1486 if (dev->dev_ctrl_req != NULL) {
1487 gs_free_req(gadget->ep0, dev->dev_ctrl_req);
1488 dev->dev_ctrl_req = NULL;
1489 }
1490 gs_free_ports(dev);
1491 kfree(dev);
1492 set_gadget_data(gadget, NULL);
1493 }
1494
1495 printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
1496 GS_VERSION_STR);
1497 }
1498
1499 /*
1500 * gs_setup
1501 *
1502 * Implements all the control endpoint functionality that's not
1503 * handled in hardware or the hardware driver.
1504 *
1505 * Returns the size of the data sent to the host, or a negative
1506 * error number.
1507 */
1508 static int gs_setup(struct usb_gadget *gadget,
1509 const struct usb_ctrlrequest *ctrl)
1510 {
1511 int ret = -EOPNOTSUPP;
1512 struct gs_dev *dev = get_gadget_data(gadget);
1513 struct usb_request *req = dev->dev_ctrl_req;
1514 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1515 u16 wValue = le16_to_cpu(ctrl->wValue);
1516 u16 wLength = le16_to_cpu(ctrl->wLength);
1517
1518 switch (ctrl->bRequestType & USB_TYPE_MASK) {
1519 case USB_TYPE_STANDARD:
1520 ret = gs_setup_standard(gadget,ctrl);
1521 break;
1522
1523 case USB_TYPE_CLASS:
1524 ret = gs_setup_class(gadget,ctrl);
1525 break;
1526
1527 default:
1528 printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1529 ctrl->bRequestType, ctrl->bRequest,
1530 wValue, wIndex, wLength);
1531 break;
1532 }
1533
1534 /* respond with data transfer before status phase? */
1535 if (ret >= 0) {
1536 req->length = ret;
1537 req->zero = ret < wLength
1538 && (ret % gadget->ep0->maxpacket) == 0;
1539 ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1540 if (ret < 0) {
1541 printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
1542 ret);
1543 req->status = 0;
1544 gs_setup_complete(gadget->ep0, req);
1545 }
1546 }
1547
1548 /* device either stalls (ret < 0) or reports success */
1549 return ret;
1550 }
1551
1552 static int gs_setup_standard(struct usb_gadget *gadget,
1553 const struct usb_ctrlrequest *ctrl)
1554 {
1555 int ret = -EOPNOTSUPP;
1556 struct gs_dev *dev = get_gadget_data(gadget);
1557 struct usb_request *req = dev->dev_ctrl_req;
1558 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1559 u16 wValue = le16_to_cpu(ctrl->wValue);
1560 u16 wLength = le16_to_cpu(ctrl->wLength);
1561
1562 switch (ctrl->bRequest) {
1563 case USB_REQ_GET_DESCRIPTOR:
1564 if (ctrl->bRequestType != USB_DIR_IN)
1565 break;
1566
1567 switch (wValue >> 8) {
1568 case USB_DT_DEVICE:
1569 ret = min(wLength,
1570 (u16)sizeof(struct usb_device_descriptor));
1571 memcpy(req->buf, &gs_device_desc, ret);
1572 break;
1573
1574 #ifdef CONFIG_USB_GADGET_DUALSPEED
1575 case USB_DT_DEVICE_QUALIFIER:
1576 if (!gadget->is_dualspeed)
1577 break;
1578 ret = min(wLength,
1579 (u16)sizeof(struct usb_qualifier_descriptor));
1580 memcpy(req->buf, &gs_qualifier_desc, ret);
1581 break;
1582
1583 case USB_DT_OTHER_SPEED_CONFIG:
1584 if (!gadget->is_dualspeed)
1585 break;
1586 /* fall through */
1587 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1588 case USB_DT_CONFIG:
1589 ret = gs_build_config_buf(req->buf, gadget->speed,
1590 wValue >> 8, wValue & 0xff,
1591 gadget->is_otg);
1592 if (ret >= 0)
1593 ret = min(wLength, (u16)ret);
1594 break;
1595
1596 case USB_DT_STRING:
1597 /* wIndex == language code. */
1598 ret = usb_gadget_get_string(&gs_string_table,
1599 wValue & 0xff, req->buf);
1600 if (ret >= 0)
1601 ret = min(wLength, (u16)ret);
1602 break;
1603 }
1604 break;
1605
1606 case USB_REQ_SET_CONFIGURATION:
1607 if (ctrl->bRequestType != 0)
1608 break;
1609 spin_lock(&dev->dev_lock);
1610 ret = gs_set_config(dev, wValue);
1611 spin_unlock(&dev->dev_lock);
1612 break;
1613
1614 case USB_REQ_GET_CONFIGURATION:
1615 if (ctrl->bRequestType != USB_DIR_IN)
1616 break;
1617 *(u8 *)req->buf = dev->dev_config;
1618 ret = min(wLength, (u16)1);
1619 break;
1620
1621 case USB_REQ_SET_INTERFACE:
1622 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1623 || !dev->dev_config
1624 || wIndex >= GS_MAX_NUM_INTERFACES)
1625 break;
1626 if (dev->dev_config == GS_BULK_CONFIG_ID
1627 && wIndex != GS_BULK_INTERFACE_ID)
1628 break;
1629 /* no alternate interface settings */
1630 if (wValue != 0)
1631 break;
1632 spin_lock(&dev->dev_lock);
1633 /* PXA hardware partially handles SET_INTERFACE;
1634 * we need to kluge around that interference. */
1635 if (gadget_is_pxa(gadget)) {
1636 ret = gs_set_config(dev, use_acm ?
1637 GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
1638 goto set_interface_done;
1639 }
1640 if (dev->dev_config != GS_BULK_CONFIG_ID
1641 && wIndex == GS_CONTROL_INTERFACE_ID) {
1642 if (dev->dev_notify_ep) {
1643 usb_ep_disable(dev->dev_notify_ep);
1644 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
1645 }
1646 } else {
1647 usb_ep_disable(dev->dev_in_ep);
1648 usb_ep_disable(dev->dev_out_ep);
1649 usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1650 usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1651 }
1652 ret = 0;
1653 set_interface_done:
1654 spin_unlock(&dev->dev_lock);
1655 break;
1656
1657 case USB_REQ_GET_INTERFACE:
1658 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1659 || dev->dev_config == GS_NO_CONFIG_ID)
1660 break;
1661 if (wIndex >= GS_MAX_NUM_INTERFACES
1662 || (dev->dev_config == GS_BULK_CONFIG_ID
1663 && wIndex != GS_BULK_INTERFACE_ID)) {
1664 ret = -EDOM;
1665 break;
1666 }
1667 /* no alternate interface settings */
1668 *(u8 *)req->buf = 0;
1669 ret = min(wLength, (u16)1);
1670 break;
1671
1672 default:
1673 printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1674 ctrl->bRequestType, ctrl->bRequest,
1675 wValue, wIndex, wLength);
1676 break;
1677 }
1678
1679 return ret;
1680 }
1681
1682 static int gs_setup_class(struct usb_gadget *gadget,
1683 const struct usb_ctrlrequest *ctrl)
1684 {
1685 int ret = -EOPNOTSUPP;
1686 struct gs_dev *dev = get_gadget_data(gadget);
1687 struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
1688 struct usb_request *req = dev->dev_ctrl_req;
1689 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1690 u16 wValue = le16_to_cpu(ctrl->wValue);
1691 u16 wLength = le16_to_cpu(ctrl->wLength);
1692
1693 switch (ctrl->bRequest) {
1694 case USB_CDC_REQ_SET_LINE_CODING:
1695 ret = min(wLength,
1696 (u16)sizeof(struct usb_cdc_line_coding));
1697 if (port) {
1698 spin_lock(&port->port_lock);
1699 memcpy(&port->port_line_coding, req->buf, ret);
1700 spin_unlock(&port->port_lock);
1701 }
1702 break;
1703
1704 case USB_CDC_REQ_GET_LINE_CODING:
1705 port = dev->dev_port[0]; /* ACM only has one port */
1706 ret = min(wLength,
1707 (u16)sizeof(struct usb_cdc_line_coding));
1708 if (port) {
1709 spin_lock(&port->port_lock);
1710 memcpy(req->buf, &port->port_line_coding, ret);
1711 spin_unlock(&port->port_lock);
1712 }
1713 break;
1714
1715 case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1716 ret = 0;
1717 break;
1718
1719 default:
1720 printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1721 ctrl->bRequestType, ctrl->bRequest,
1722 wValue, wIndex, wLength);
1723 break;
1724 }
1725
1726 return ret;
1727 }
1728
1729 /*
1730 * gs_setup_complete
1731 */
1732 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
1733 {
1734 if (req->status || req->actual != req->length) {
1735 printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
1736 req->status, req->actual, req->length);
1737 }
1738 }
1739
1740 /*
1741 * gs_disconnect
1742 *
1743 * Called when the device is disconnected. Frees the closed
1744 * ports and disconnects open ports. Open ports will be freed
1745 * on close. Then reallocates the ports for the next connection.
1746 */
1747 static void gs_disconnect(struct usb_gadget *gadget)
1748 {
1749 unsigned long flags;
1750 struct gs_dev *dev = get_gadget_data(gadget);
1751
1752 spin_lock_irqsave(&dev->dev_lock, flags);
1753
1754 gs_reset_config(dev);
1755
1756 /* free closed ports and disconnect open ports */
1757 /* (open ports will be freed when closed) */
1758 gs_free_ports(dev);
1759
1760 /* re-allocate ports for the next connection */
1761 if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1762 printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
1763
1764 spin_unlock_irqrestore(&dev->dev_lock, flags);
1765
1766 printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
1767 }
1768
1769 /*
1770 * gs_set_config
1771 *
1772 * Configures the device by enabling device specific
1773 * optimizations, setting up the endpoints, allocating
1774 * read and write requests and queuing read requests.
1775 *
1776 * The device lock must be held when calling this function.
1777 */
1778 static int gs_set_config(struct gs_dev *dev, unsigned config)
1779 {
1780 int i;
1781 int ret = 0;
1782 struct usb_gadget *gadget = dev->dev_gadget;
1783 struct usb_ep *ep;
1784 struct usb_endpoint_descriptor *ep_desc;
1785 struct usb_request *req;
1786 struct gs_req_entry *req_entry;
1787
1788 if (dev == NULL) {
1789 printk(KERN_ERR "gs_set_config: NULL device pointer\n");
1790 return 0;
1791 }
1792
1793 if (config == dev->dev_config)
1794 return 0;
1795
1796 gs_reset_config(dev);
1797
1798 switch (config) {
1799 case GS_NO_CONFIG_ID:
1800 return 0;
1801 case GS_BULK_CONFIG_ID:
1802 if (use_acm)
1803 return -EINVAL;
1804 /* device specific optimizations */
1805 if (gadget_is_net2280(gadget))
1806 net2280_set_fifo_mode(gadget, 1);
1807 break;
1808 case GS_ACM_CONFIG_ID:
1809 if (!use_acm)
1810 return -EINVAL;
1811 /* device specific optimizations */
1812 if (gadget_is_net2280(gadget))
1813 net2280_set_fifo_mode(gadget, 1);
1814 break;
1815 default:
1816 return -EINVAL;
1817 }
1818
1819 dev->dev_config = config;
1820
1821 gadget_for_each_ep(ep, gadget) {
1822
1823 if (EP_NOTIFY_NAME
1824 && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
1825 ep_desc = GS_SPEED_SELECT(
1826 gadget->speed == USB_SPEED_HIGH,
1827 &gs_highspeed_notify_desc,
1828 &gs_fullspeed_notify_desc);
1829 ret = usb_ep_enable(ep,ep_desc);
1830 if (ret == 0) {
1831 ep->driver_data = dev;
1832 dev->dev_notify_ep = ep;
1833 dev->dev_notify_ep_desc = ep_desc;
1834 } else {
1835 printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
1836 ep->name, ret);
1837 goto exit_reset_config;
1838 }
1839 }
1840
1841 else if (strcmp(ep->name, EP_IN_NAME) == 0) {
1842 ep_desc = GS_SPEED_SELECT(
1843 gadget->speed == USB_SPEED_HIGH,
1844 &gs_highspeed_in_desc,
1845 &gs_fullspeed_in_desc);
1846 ret = usb_ep_enable(ep,ep_desc);
1847 if (ret == 0) {
1848 ep->driver_data = dev;
1849 dev->dev_in_ep = ep;
1850 dev->dev_in_ep_desc = ep_desc;
1851 } else {
1852 printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
1853 ep->name, ret);
1854 goto exit_reset_config;
1855 }
1856 }
1857
1858 else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
1859 ep_desc = GS_SPEED_SELECT(
1860 gadget->speed == USB_SPEED_HIGH,
1861 &gs_highspeed_out_desc,
1862 &gs_fullspeed_out_desc);
1863 ret = usb_ep_enable(ep,ep_desc);
1864 if (ret == 0) {
1865 ep->driver_data = dev;
1866 dev->dev_out_ep = ep;
1867 dev->dev_out_ep_desc = ep_desc;
1868 } else {
1869 printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
1870 ep->name, ret);
1871 goto exit_reset_config;
1872 }
1873 }
1874
1875 }
1876
1877 if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
1878 || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
1879 printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
1880 ret = -ENODEV;
1881 goto exit_reset_config;
1882 }
1883
1884 /* allocate and queue read requests */
1885 ep = dev->dev_out_ep;
1886 for (i=0; i<read_q_size && ret == 0; i++) {
1887 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1888 req->complete = gs_read_complete;
1889 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1890 printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
1891 ret);
1892 }
1893 } else {
1894 printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
1895 ret = -ENOMEM;
1896 goto exit_reset_config;
1897 }
1898 }
1899
1900 /* allocate write requests, and put on free list */
1901 ep = dev->dev_in_ep;
1902 for (i=0; i<write_q_size; i++) {
1903 if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
1904 req_entry->re_req->complete = gs_write_complete;
1905 list_add(&req_entry->re_entry, &dev->dev_req_list);
1906 } else {
1907 printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
1908 ret = -ENOMEM;
1909 goto exit_reset_config;
1910 }
1911 }
1912
1913 printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
1914 GS_LONG_NAME,
1915 gadget->speed == USB_SPEED_HIGH ? "high" : "full",
1916 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
1917
1918 return 0;
1919
1920 exit_reset_config:
1921 gs_reset_config(dev);
1922 return ret;
1923 }
1924
1925 /*
1926 * gs_reset_config
1927 *
1928 * Mark the device as not configured, disable all endpoints,
1929 * which forces completion of pending I/O and frees queued
1930 * requests, and free the remaining write requests on the
1931 * free list.
1932 *
1933 * The device lock must be held when calling this function.
1934 */
1935 static void gs_reset_config(struct gs_dev *dev)
1936 {
1937 struct gs_req_entry *req_entry;
1938
1939 if (dev == NULL) {
1940 printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
1941 return;
1942 }
1943
1944 if (dev->dev_config == GS_NO_CONFIG_ID)
1945 return;
1946
1947 dev->dev_config = GS_NO_CONFIG_ID;
1948
1949 /* free write requests on the free list */
1950 while(!list_empty(&dev->dev_req_list)) {
1951 req_entry = list_entry(dev->dev_req_list.next,
1952 struct gs_req_entry, re_entry);
1953 list_del(&req_entry->re_entry);
1954 gs_free_req_entry(dev->dev_in_ep, req_entry);
1955 }
1956
1957 /* disable endpoints, forcing completion of pending i/o; */
1958 /* completion handlers free their requests in this case */
1959 if (dev->dev_notify_ep) {
1960 usb_ep_disable(dev->dev_notify_ep);
1961 dev->dev_notify_ep = NULL;
1962 }
1963 if (dev->dev_in_ep) {
1964 usb_ep_disable(dev->dev_in_ep);
1965 dev->dev_in_ep = NULL;
1966 }
1967 if (dev->dev_out_ep) {
1968 usb_ep_disable(dev->dev_out_ep);
1969 dev->dev_out_ep = NULL;
1970 }
1971 }
1972
1973 /*
1974 * gs_build_config_buf
1975 *
1976 * Builds the config descriptors in the given buffer and returns the
1977 * length, or a negative error number.
1978 */
1979 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
1980 u8 type, unsigned int index, int is_otg)
1981 {
1982 int len;
1983 int high_speed;
1984 const struct usb_config_descriptor *config_desc;
1985 const struct usb_descriptor_header **function;
1986
1987 if (index >= gs_device_desc.bNumConfigurations)
1988 return -EINVAL;
1989
1990 /* other speed switches high and full speed */
1991 high_speed = (speed == USB_SPEED_HIGH);
1992 if (type == USB_DT_OTHER_SPEED_CONFIG)
1993 high_speed = !high_speed;
1994
1995 if (use_acm) {
1996 config_desc = &gs_acm_config_desc;
1997 function = GS_SPEED_SELECT(high_speed,
1998 gs_acm_highspeed_function,
1999 gs_acm_fullspeed_function);
2000 } else {
2001 config_desc = &gs_bulk_config_desc;
2002 function = GS_SPEED_SELECT(high_speed,
2003 gs_bulk_highspeed_function,
2004 gs_bulk_fullspeed_function);
2005 }
2006
2007 /* for now, don't advertise srp-only devices */
2008 if (!is_otg)
2009 function++;
2010
2011 len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
2012 if (len < 0)
2013 return len;
2014
2015 ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
2016
2017 return len;
2018 }
2019
2020 /*
2021 * gs_alloc_req
2022 *
2023 * Allocate a usb_request and its buffer. Returns a pointer to the
2024 * usb_request or NULL if there is an error.
2025 */
2026 static struct usb_request *
2027 gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags)
2028 {
2029 struct usb_request *req;
2030
2031 if (ep == NULL)
2032 return NULL;
2033
2034 req = usb_ep_alloc_request(ep, kmalloc_flags);
2035
2036 if (req != NULL) {
2037 req->length = len;
2038 req->buf = kmalloc(len, kmalloc_flags);
2039 if (req->buf == NULL) {
2040 usb_ep_free_request(ep, req);
2041 return NULL;
2042 }
2043 }
2044
2045 return req;
2046 }
2047
2048 /*
2049 * gs_free_req
2050 *
2051 * Free a usb_request and its buffer.
2052 */
2053 static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
2054 {
2055 if (ep != NULL && req != NULL) {
2056 kfree(req->buf);
2057 usb_ep_free_request(ep, req);
2058 }
2059 }
2060
2061 /*
2062 * gs_alloc_req_entry
2063 *
2064 * Allocates a request and its buffer, using the given
2065 * endpoint, buffer len, and kmalloc flags.
2066 */
2067 static struct gs_req_entry *
2068 gs_alloc_req_entry(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
2069 {
2070 struct gs_req_entry *req;
2071
2072 req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
2073 if (req == NULL)
2074 return NULL;
2075
2076 req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
2077 if (req->re_req == NULL) {
2078 kfree(req);
2079 return NULL;
2080 }
2081
2082 req->re_req->context = req;
2083
2084 return req;
2085 }
2086
2087 /*
2088 * gs_free_req_entry
2089 *
2090 * Frees a request and its buffer.
2091 */
2092 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
2093 {
2094 if (ep != NULL && req != NULL) {
2095 if (req->re_req != NULL)
2096 gs_free_req(ep, req->re_req);
2097 kfree(req);
2098 }
2099 }
2100
2101 /*
2102 * gs_alloc_ports
2103 *
2104 * Allocate all ports and set the gs_dev struct to point to them.
2105 * Return 0 if successful, or a negative error number.
2106 *
2107 * The device lock is normally held when calling this function.
2108 */
2109 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
2110 {
2111 int i;
2112 struct gs_port *port;
2113
2114 if (dev == NULL)
2115 return -EIO;
2116
2117 for (i=0; i<GS_NUM_PORTS; i++) {
2118 if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
2119 return -ENOMEM;
2120
2121 port->port_dev = dev;
2122 port->port_num = i;
2123 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
2124 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
2125 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
2126 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
2127 spin_lock_init(&port->port_lock);
2128 init_waitqueue_head(&port->port_write_wait);
2129
2130 dev->dev_port[i] = port;
2131 }
2132
2133 return 0;
2134 }
2135
2136 /*
2137 * gs_free_ports
2138 *
2139 * Free all closed ports. Open ports are disconnected by
2140 * freeing their write buffers, setting their device pointers
2141 * and the pointers to them in the device to NULL. These
2142 * ports will be freed when closed.
2143 *
2144 * The device lock is normally held when calling this function.
2145 */
2146 static void gs_free_ports(struct gs_dev *dev)
2147 {
2148 int i;
2149 unsigned long flags;
2150 struct gs_port *port;
2151
2152 if (dev == NULL)
2153 return;
2154
2155 for (i=0; i<GS_NUM_PORTS; i++) {
2156 if ((port=dev->dev_port[i]) != NULL) {
2157 dev->dev_port[i] = NULL;
2158
2159 spin_lock_irqsave(&port->port_lock, flags);
2160
2161 if (port->port_write_buf != NULL) {
2162 gs_buf_free(port->port_write_buf);
2163 port->port_write_buf = NULL;
2164 }
2165
2166 if (port->port_open_count > 0 || port->port_in_use) {
2167 port->port_dev = NULL;
2168 wake_up_interruptible(&port->port_write_wait);
2169 if (port->port_tty) {
2170 wake_up_interruptible(&port->port_tty->read_wait);
2171 wake_up_interruptible(&port->port_tty->write_wait);
2172 }
2173 spin_unlock_irqrestore(&port->port_lock, flags);
2174 } else {
2175 spin_unlock_irqrestore(&port->port_lock, flags);
2176 kfree(port);
2177 }
2178
2179 }
2180 }
2181 }
2182
2183 /* Circular Buffer */
2184
2185 /*
2186 * gs_buf_alloc
2187 *
2188 * Allocate a circular buffer and all associated memory.
2189 */
2190 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
2191 {
2192 struct gs_buf *gb;
2193
2194 if (size == 0)
2195 return NULL;
2196
2197 gb = (struct gs_buf *)kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2198 if (gb == NULL)
2199 return NULL;
2200
2201 gb->buf_buf = kmalloc(size, kmalloc_flags);
2202 if (gb->buf_buf == NULL) {
2203 kfree(gb);
2204 return NULL;
2205 }
2206
2207 gb->buf_size = size;
2208 gb->buf_get = gb->buf_put = gb->buf_buf;
2209
2210 return gb;
2211 }
2212
2213 /*
2214 * gs_buf_free
2215 *
2216 * Free the buffer and all associated memory.
2217 */
2218 void gs_buf_free(struct gs_buf *gb)
2219 {
2220 if (gb) {
2221 kfree(gb->buf_buf);
2222 kfree(gb);
2223 }
2224 }
2225
2226 /*
2227 * gs_buf_clear
2228 *
2229 * Clear out all data in the circular buffer.
2230 */
2231 void gs_buf_clear(struct gs_buf *gb)
2232 {
2233 if (gb != NULL)
2234 gb->buf_get = gb->buf_put;
2235 /* equivalent to a get of all data available */
2236 }
2237
2238 /*
2239 * gs_buf_data_avail
2240 *
2241 * Return the number of bytes of data available in the circular
2242 * buffer.
2243 */
2244 unsigned int gs_buf_data_avail(struct gs_buf *gb)
2245 {
2246 if (gb != NULL)
2247 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2248 else
2249 return 0;
2250 }
2251
2252 /*
2253 * gs_buf_space_avail
2254 *
2255 * Return the number of bytes of space available in the circular
2256 * buffer.
2257 */
2258 unsigned int gs_buf_space_avail(struct gs_buf *gb)
2259 {
2260 if (gb != NULL)
2261 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2262 else
2263 return 0;
2264 }
2265
2266 /*
2267 * gs_buf_put
2268 *
2269 * Copy data data from a user buffer and put it into the circular buffer.
2270 * Restrict to the amount of space available.
2271 *
2272 * Return the number of bytes copied.
2273 */
2274 unsigned int gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2275 {
2276 unsigned int len;
2277
2278 if (gb == NULL)
2279 return 0;
2280
2281 len = gs_buf_space_avail(gb);
2282 if (count > len)
2283 count = len;
2284
2285 if (count == 0)
2286 return 0;
2287
2288 len = gb->buf_buf + gb->buf_size - gb->buf_put;
2289 if (count > len) {
2290 memcpy(gb->buf_put, buf, len);
2291 memcpy(gb->buf_buf, buf+len, count - len);
2292 gb->buf_put = gb->buf_buf + count - len;
2293 } else {
2294 memcpy(gb->buf_put, buf, count);
2295 if (count < len)
2296 gb->buf_put += count;
2297 else /* count == len */
2298 gb->buf_put = gb->buf_buf;
2299 }
2300
2301 return count;
2302 }
2303
2304 /*
2305 * gs_buf_get
2306 *
2307 * Get data from the circular buffer and copy to the given buffer.
2308 * Restrict to the amount of data available.
2309 *
2310 * Return the number of bytes copied.
2311 */
2312 unsigned int gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2313 {
2314 unsigned int len;
2315
2316 if (gb == NULL)
2317 return 0;
2318
2319 len = gs_buf_data_avail(gb);
2320 if (count > len)
2321 count = len;
2322
2323 if (count == 0)
2324 return 0;
2325
2326 len = gb->buf_buf + gb->buf_size - gb->buf_get;
2327 if (count > len) {
2328 memcpy(buf, gb->buf_get, len);
2329 memcpy(buf+len, gb->buf_buf, count - len);
2330 gb->buf_get = gb->buf_buf + count - len;
2331 } else {
2332 memcpy(buf, gb->buf_get, count);
2333 if (count < len)
2334 gb->buf_get += count;
2335 else /* count == len */
2336 gb->buf_get = gb->buf_buf;
2337 }
2338
2339 return count;
2340 }
Linux kernel - Deliverables
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