]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/usb/gadget/serial.c
projects / mirror_ubuntu-zesty-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-2.6
[mirror_ubuntu-zesty-kernel.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 /* Wait Cond */
55
56 #define __wait_cond_interruptible(wq, condition, lock, flags, ret) \
57 do { \
58 wait_queue_t __wait; \
59 init_waitqueue_entry(&__wait, current); \
60 \
61 add_wait_queue(&wq, &__wait); \
62 for (;;) { \
63 set_current_state(TASK_INTERRUPTIBLE); \
64 if (condition) \
65 break; \
66 if (!signal_pending(current)) { \
67 spin_unlock_irqrestore(lock, flags); \
68 schedule(); \
69 spin_lock_irqsave(lock, flags); \
70 continue; \
71 } \
72 ret = -ERESTARTSYS; \
73 break; \
74 } \
75 current->state = TASK_RUNNING; \
76 remove_wait_queue(&wq, &__wait); \
77 } while (0)
78
79 #define wait_cond_interruptible(wq, condition, lock, flags) \
80 ({ \
81 int __ret = 0; \
82 if (!(condition)) \
83 __wait_cond_interruptible(wq, condition, lock, flags, \
84 __ret); \
85 __ret; \
86 })
87
88 #define __wait_cond_interruptible_timeout(wq, condition, lock, flags, \
89 timeout, ret) \
90 do { \
91 signed long __timeout = timeout; \
92 wait_queue_t __wait; \
93 init_waitqueue_entry(&__wait, current); \
94 \
95 add_wait_queue(&wq, &__wait); \
96 for (;;) { \
97 set_current_state(TASK_INTERRUPTIBLE); \
98 if (__timeout == 0) \
99 break; \
100 if (condition) \
101 break; \
102 if (!signal_pending(current)) { \
103 spin_unlock_irqrestore(lock, flags); \
104 __timeout = schedule_timeout(__timeout); \
105 spin_lock_irqsave(lock, flags); \
106 continue; \
107 } \
108 ret = -ERESTARTSYS; \
109 break; \
110 } \
111 current->state = TASK_RUNNING; \
112 remove_wait_queue(&wq, &__wait); \
113 } while (0)
114
115 #define wait_cond_interruptible_timeout(wq, condition, lock, flags, \
116 timeout) \
117 ({ \
118 int __ret = 0; \
119 if (!(condition)) \
120 __wait_cond_interruptible_timeout(wq, condition, lock, \
121 flags, timeout, __ret); \
122 __ret; \
123 })
124
125
126 /* Defines */
127
128 #define GS_VERSION_STR "v2.0"
129 #define GS_VERSION_NUM 0x0200
130
131 #define GS_LONG_NAME "Gadget Serial"
132 #define GS_SHORT_NAME "g_serial"
133
134 #define GS_MAJOR 127
135 #define GS_MINOR_START 0
136
137 #define GS_NUM_PORTS 16
138
139 #define GS_NUM_CONFIGS 1
140 #define GS_NO_CONFIG_ID 0
141 #define GS_BULK_CONFIG_ID 1
142 #define GS_ACM_CONFIG_ID 2
143
144 #define GS_MAX_NUM_INTERFACES 2
145 #define GS_BULK_INTERFACE_ID 0
146 #define GS_CONTROL_INTERFACE_ID 0
147 #define GS_DATA_INTERFACE_ID 1
148
149 #define GS_MAX_DESC_LEN 256
150
151 #define GS_DEFAULT_READ_Q_SIZE 32
152 #define GS_DEFAULT_WRITE_Q_SIZE 32
153
154 #define GS_DEFAULT_WRITE_BUF_SIZE 8192
155 #define GS_TMP_BUF_SIZE 8192
156
157 #define GS_CLOSE_TIMEOUT 15
158
159 #define GS_DEFAULT_USE_ACM 0
160
161 #define GS_DEFAULT_DTE_RATE 9600
162 #define GS_DEFAULT_DATA_BITS 8
163 #define GS_DEFAULT_PARITY USB_CDC_NO_PARITY
164 #define GS_DEFAULT_CHAR_FORMAT USB_CDC_1_STOP_BITS
165
166 /* select highspeed/fullspeed, hiding highspeed if not configured */
167 #ifdef CONFIG_USB_GADGET_DUALSPEED
168 #define GS_SPEED_SELECT(is_hs,hs,fs) ((is_hs) ? (hs) : (fs))
169 #else
170 #define GS_SPEED_SELECT(is_hs,hs,fs) (fs)
171 #endif /* CONFIG_USB_GADGET_DUALSPEED */
172
173 /* debug settings */
174 #ifdef GS_DEBUG
175 static int debug = 1;
176
177 #define gs_debug(format, arg...) \
178 do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
179 #define gs_debug_level(level, format, arg...) \
180 do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
181
182 #else
183
184 #define gs_debug(format, arg...) \
185 do { } while(0)
186 #define gs_debug_level(level, format, arg...) \
187 do { } while(0)
188
189 #endif /* GS_DEBUG */
190
191 /* Thanks to NetChip Technologies for donating this product ID.
192 *
193 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
194 * Instead: allocate your own, using normal USB-IF procedures.
195 */
196 #define GS_VENDOR_ID 0x0525 /* NetChip */
197 #define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
198 #define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
199
200 #define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
201 #define GS_NOTIFY_MAXPACKET 8
202
203
204 /* Structures */
205
206 struct gs_dev;
207
208 /* circular buffer */
209 struct gs_buf {
210 unsigned int buf_size;
211 char *buf_buf;
212 char *buf_get;
213 char *buf_put;
214 };
215
216 /* list of requests */
217 struct gs_req_entry {
218 struct list_head re_entry;
219 struct usb_request *re_req;
220 };
221
222 /* the port structure holds info for each port, one for each minor number */
223 struct gs_port {
224 struct gs_dev *port_dev; /* pointer to device struct */
225 struct tty_struct *port_tty; /* pointer to tty struct */
226 spinlock_t port_lock;
227 int port_num;
228 int port_open_count;
229 int port_in_use; /* open/close in progress */
230 wait_queue_head_t port_write_wait;/* waiting to write */
231 struct gs_buf *port_write_buf;
232 struct usb_cdc_line_coding port_line_coding;
233 };
234
235 /* the device structure holds info for the USB device */
236 struct gs_dev {
237 struct usb_gadget *dev_gadget; /* gadget device pointer */
238 spinlock_t dev_lock; /* lock for set/reset config */
239 int dev_config; /* configuration number */
240 struct usb_ep *dev_notify_ep; /* address of notify endpoint */
241 struct usb_ep *dev_in_ep; /* address of in endpoint */
242 struct usb_ep *dev_out_ep; /* address of out endpoint */
243 struct usb_endpoint_descriptor /* descriptor of notify ep */
244 *dev_notify_ep_desc;
245 struct usb_endpoint_descriptor /* descriptor of in endpoint */
246 *dev_in_ep_desc;
247 struct usb_endpoint_descriptor /* descriptor of out endpoint */
248 *dev_out_ep_desc;
249 struct usb_request *dev_ctrl_req; /* control request */
250 struct list_head dev_req_list; /* list of write requests */
251 int dev_sched_port; /* round robin port scheduled */
252 struct gs_port *dev_port[GS_NUM_PORTS]; /* the ports */
253 };
254
255
256 /* Functions */
257
258 /* module */
259 static int __init gs_module_init(void);
260 static void __exit gs_module_exit(void);
261
262 /* tty driver */
263 static int gs_open(struct tty_struct *tty, struct file *file);
264 static void gs_close(struct tty_struct *tty, struct file *file);
265 static int gs_write(struct tty_struct *tty,
266 const unsigned char *buf, int count);
267 static void gs_put_char(struct tty_struct *tty, unsigned char ch);
268 static void gs_flush_chars(struct tty_struct *tty);
269 static int gs_write_room(struct tty_struct *tty);
270 static int gs_chars_in_buffer(struct tty_struct *tty);
271 static void gs_throttle(struct tty_struct * tty);
272 static void gs_unthrottle(struct tty_struct * tty);
273 static void gs_break(struct tty_struct *tty, int break_state);
274 static int gs_ioctl(struct tty_struct *tty, struct file *file,
275 unsigned int cmd, unsigned long arg);
276 static void gs_set_termios(struct tty_struct *tty, struct termios *old);
277
278 static int gs_send(struct gs_dev *dev);
279 static int gs_send_packet(struct gs_dev *dev, char *packet,
280 unsigned int size);
281 static int gs_recv_packet(struct gs_dev *dev, char *packet,
282 unsigned int size);
283 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
284 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
285
286 /* gadget driver */
287 static int gs_bind(struct usb_gadget *gadget);
288 static void gs_unbind(struct usb_gadget *gadget);
289 static int gs_setup(struct usb_gadget *gadget,
290 const struct usb_ctrlrequest *ctrl);
291 static int gs_setup_standard(struct usb_gadget *gadget,
292 const struct usb_ctrlrequest *ctrl);
293 static int gs_setup_class(struct usb_gadget *gadget,
294 const struct usb_ctrlrequest *ctrl);
295 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
296 static void gs_disconnect(struct usb_gadget *gadget);
297 static int gs_set_config(struct gs_dev *dev, unsigned config);
298 static void gs_reset_config(struct gs_dev *dev);
299 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
300 u8 type, unsigned int index, int is_otg);
301
302 static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
303 unsigned kmalloc_flags);
304 static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
305
306 static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
307 unsigned kmalloc_flags);
308 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
309
310 static int gs_alloc_ports(struct gs_dev *dev, unsigned kmalloc_flags);
311 static void gs_free_ports(struct gs_dev *dev);
312
313 /* circular buffer */
314 static struct gs_buf *gs_buf_alloc(unsigned int size, unsigned kmalloc_flags);
315 static void gs_buf_free(struct gs_buf *gb);
316 static void gs_buf_clear(struct gs_buf *gb);
317 static unsigned int gs_buf_data_avail(struct gs_buf *gb);
318 static unsigned int gs_buf_space_avail(struct gs_buf *gb);
319 static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
320 unsigned int count);
321 static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
322 unsigned int count);
323
324 /* external functions */
325 extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
326
327
328 /* Globals */
329
330 static struct gs_dev *gs_device;
331
332 static const char *EP_IN_NAME;
333 static const char *EP_OUT_NAME;
334 static const char *EP_NOTIFY_NAME;
335
336 static struct semaphore gs_open_close_sem[GS_NUM_PORTS];
337
338 static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
339 static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
340
341 static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
342
343 static unsigned int use_acm = GS_DEFAULT_USE_ACM;
344
345
346 /* tty driver struct */
347 static struct tty_operations gs_tty_ops = {
348 .open = gs_open,
349 .close = gs_close,
350 .write = gs_write,
351 .put_char = gs_put_char,
352 .flush_chars = gs_flush_chars,
353 .write_room = gs_write_room,
354 .ioctl = gs_ioctl,
355 .set_termios = gs_set_termios,
356 .throttle = gs_throttle,
357 .unthrottle = gs_unthrottle,
358 .break_ctl = gs_break,
359 .chars_in_buffer = gs_chars_in_buffer,
360 };
361 static struct tty_driver *gs_tty_driver;
362
363 /* gadget driver struct */
364 static struct usb_gadget_driver gs_gadget_driver = {
365 #ifdef CONFIG_USB_GADGET_DUALSPEED
366 .speed = USB_SPEED_HIGH,
367 #else
368 .speed = USB_SPEED_FULL,
369 #endif /* CONFIG_USB_GADGET_DUALSPEED */
370 .function = GS_LONG_NAME,
371 .bind = gs_bind,
372 .unbind = gs_unbind,
373 .setup = gs_setup,
374 .disconnect = gs_disconnect,
375 .driver = {
376 .name = GS_SHORT_NAME,
377 /* .shutdown = ... */
378 /* .suspend = ... */
379 /* .resume = ... */
380 },
381 };
382
383
384 /* USB descriptors */
385
386 #define GS_MANUFACTURER_STR_ID 1
387 #define GS_PRODUCT_STR_ID 2
388 #define GS_SERIAL_STR_ID 3
389 #define GS_BULK_CONFIG_STR_ID 4
390 #define GS_ACM_CONFIG_STR_ID 5
391 #define GS_CONTROL_STR_ID 6
392 #define GS_DATA_STR_ID 7
393
394 /* static strings, in UTF-8 */
395 static char manufacturer[50];
396 static struct usb_string gs_strings[] = {
397 { GS_MANUFACTURER_STR_ID, manufacturer },
398 { GS_PRODUCT_STR_ID, GS_LONG_NAME },
399 { GS_SERIAL_STR_ID, "0" },
400 { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
401 { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
402 { GS_CONTROL_STR_ID, "Gadget Serial Control" },
403 { GS_DATA_STR_ID, "Gadget Serial Data" },
404 { } /* end of list */
405 };
406
407 static struct usb_gadget_strings gs_string_table = {
408 .language = 0x0409, /* en-us */
409 .strings = gs_strings,
410 };
411
412 static struct usb_device_descriptor gs_device_desc = {
413 .bLength = USB_DT_DEVICE_SIZE,
414 .bDescriptorType = USB_DT_DEVICE,
415 .bcdUSB = __constant_cpu_to_le16(0x0200),
416 .bDeviceSubClass = 0,
417 .bDeviceProtocol = 0,
418 .idVendor = __constant_cpu_to_le16(GS_VENDOR_ID),
419 .idProduct = __constant_cpu_to_le16(GS_PRODUCT_ID),
420 .iManufacturer = GS_MANUFACTURER_STR_ID,
421 .iProduct = GS_PRODUCT_STR_ID,
422 .iSerialNumber = GS_SERIAL_STR_ID,
423 .bNumConfigurations = GS_NUM_CONFIGS,
424 };
425
426 static struct usb_otg_descriptor gs_otg_descriptor = {
427 .bLength = sizeof(gs_otg_descriptor),
428 .bDescriptorType = USB_DT_OTG,
429 .bmAttributes = USB_OTG_SRP,
430 };
431
432 static struct usb_config_descriptor gs_bulk_config_desc = {
433 .bLength = USB_DT_CONFIG_SIZE,
434 .bDescriptorType = USB_DT_CONFIG,
435 /* .wTotalLength computed dynamically */
436 .bNumInterfaces = 1,
437 .bConfigurationValue = GS_BULK_CONFIG_ID,
438 .iConfiguration = GS_BULK_CONFIG_STR_ID,
439 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
440 .bMaxPower = 1,
441 };
442
443 static struct usb_config_descriptor gs_acm_config_desc = {
444 .bLength = USB_DT_CONFIG_SIZE,
445 .bDescriptorType = USB_DT_CONFIG,
446 /* .wTotalLength computed dynamically */
447 .bNumInterfaces = 2,
448 .bConfigurationValue = GS_ACM_CONFIG_ID,
449 .iConfiguration = GS_ACM_CONFIG_STR_ID,
450 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
451 .bMaxPower = 1,
452 };
453
454 static const struct usb_interface_descriptor gs_bulk_interface_desc = {
455 .bLength = USB_DT_INTERFACE_SIZE,
456 .bDescriptorType = USB_DT_INTERFACE,
457 .bInterfaceNumber = GS_BULK_INTERFACE_ID,
458 .bNumEndpoints = 2,
459 .bInterfaceClass = USB_CLASS_CDC_DATA,
460 .bInterfaceSubClass = 0,
461 .bInterfaceProtocol = 0,
462 .iInterface = GS_DATA_STR_ID,
463 };
464
465 static const struct usb_interface_descriptor gs_control_interface_desc = {
466 .bLength = USB_DT_INTERFACE_SIZE,
467 .bDescriptorType = USB_DT_INTERFACE,
468 .bInterfaceNumber = GS_CONTROL_INTERFACE_ID,
469 .bNumEndpoints = 1,
470 .bInterfaceClass = USB_CLASS_COMM,
471 .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
472 .bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
473 .iInterface = GS_CONTROL_STR_ID,
474 };
475
476 static const struct usb_interface_descriptor gs_data_interface_desc = {
477 .bLength = USB_DT_INTERFACE_SIZE,
478 .bDescriptorType = USB_DT_INTERFACE,
479 .bInterfaceNumber = GS_DATA_INTERFACE_ID,
480 .bNumEndpoints = 2,
481 .bInterfaceClass = USB_CLASS_CDC_DATA,
482 .bInterfaceSubClass = 0,
483 .bInterfaceProtocol = 0,
484 .iInterface = GS_DATA_STR_ID,
485 };
486
487 static const struct usb_cdc_header_desc gs_header_desc = {
488 .bLength = sizeof(gs_header_desc),
489 .bDescriptorType = USB_DT_CS_INTERFACE,
490 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
491 .bcdCDC = __constant_cpu_to_le16(0x0110),
492 };
493
494 static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
495 .bLength = sizeof(gs_call_mgmt_descriptor),
496 .bDescriptorType = USB_DT_CS_INTERFACE,
497 .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
498 .bmCapabilities = 0,
499 .bDataInterface = 1, /* index of data interface */
500 };
501
502 static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
503 .bLength = sizeof(gs_acm_descriptor),
504 .bDescriptorType = USB_DT_CS_INTERFACE,
505 .bDescriptorSubType = USB_CDC_ACM_TYPE,
506 .bmCapabilities = 0,
507 };
508
509 static const struct usb_cdc_union_desc gs_union_desc = {
510 .bLength = sizeof(gs_union_desc),
511 .bDescriptorType = USB_DT_CS_INTERFACE,
512 .bDescriptorSubType = USB_CDC_UNION_TYPE,
513 .bMasterInterface0 = 0, /* index of control interface */
514 .bSlaveInterface0 = 1, /* index of data interface */
515 };
516
517 static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
518 .bLength = USB_DT_ENDPOINT_SIZE,
519 .bDescriptorType = USB_DT_ENDPOINT,
520 .bEndpointAddress = USB_DIR_IN,
521 .bmAttributes = USB_ENDPOINT_XFER_INT,
522 .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
523 .bInterval = 1 << GS_LOG2_NOTIFY_INTERVAL,
524 };
525
526 static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
527 .bLength = USB_DT_ENDPOINT_SIZE,
528 .bDescriptorType = USB_DT_ENDPOINT,
529 .bEndpointAddress = USB_DIR_IN,
530 .bmAttributes = USB_ENDPOINT_XFER_BULK,
531 };
532
533 static struct usb_endpoint_descriptor gs_fullspeed_out_desc = {
534 .bLength = USB_DT_ENDPOINT_SIZE,
535 .bDescriptorType = USB_DT_ENDPOINT,
536 .bEndpointAddress = USB_DIR_OUT,
537 .bmAttributes = USB_ENDPOINT_XFER_BULK,
538 };
539
540 static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
541 (struct usb_descriptor_header *) &gs_otg_descriptor,
542 (struct usb_descriptor_header *) &gs_bulk_interface_desc,
543 (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
544 (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
545 NULL,
546 };
547
548 static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
549 (struct usb_descriptor_header *) &gs_otg_descriptor,
550 (struct usb_descriptor_header *) &gs_control_interface_desc,
551 (struct usb_descriptor_header *) &gs_header_desc,
552 (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
553 (struct usb_descriptor_header *) &gs_acm_descriptor,
554 (struct usb_descriptor_header *) &gs_union_desc,
555 (struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
556 (struct usb_descriptor_header *) &gs_data_interface_desc,
557 (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
558 (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
559 NULL,
560 };
561
562 #ifdef CONFIG_USB_GADGET_DUALSPEED
563 static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
564 .bLength = USB_DT_ENDPOINT_SIZE,
565 .bDescriptorType = USB_DT_ENDPOINT,
566 .bEndpointAddress = USB_DIR_IN,
567 .bmAttributes = USB_ENDPOINT_XFER_INT,
568 .wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
569 .bInterval = GS_LOG2_NOTIFY_INTERVAL+4,
570 };
571
572 static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
573 .bLength = USB_DT_ENDPOINT_SIZE,
574 .bDescriptorType = USB_DT_ENDPOINT,
575 .bmAttributes = USB_ENDPOINT_XFER_BULK,
576 .wMaxPacketSize = __constant_cpu_to_le16(512),
577 };
578
579 static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
580 .bLength = USB_DT_ENDPOINT_SIZE,
581 .bDescriptorType = USB_DT_ENDPOINT,
582 .bmAttributes = USB_ENDPOINT_XFER_BULK,
583 .wMaxPacketSize = __constant_cpu_to_le16(512),
584 };
585
586 static struct usb_qualifier_descriptor gs_qualifier_desc = {
587 .bLength = sizeof(struct usb_qualifier_descriptor),
588 .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
589 .bcdUSB = __constant_cpu_to_le16 (0x0200),
590 /* assumes ep0 uses the same value for both speeds ... */
591 .bNumConfigurations = GS_NUM_CONFIGS,
592 };
593
594 static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
595 (struct usb_descriptor_header *) &gs_otg_descriptor,
596 (struct usb_descriptor_header *) &gs_bulk_interface_desc,
597 (struct usb_descriptor_header *) &gs_highspeed_in_desc,
598 (struct usb_descriptor_header *) &gs_highspeed_out_desc,
599 NULL,
600 };
601
602 static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
603 (struct usb_descriptor_header *) &gs_otg_descriptor,
604 (struct usb_descriptor_header *) &gs_control_interface_desc,
605 (struct usb_descriptor_header *) &gs_header_desc,
606 (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
607 (struct usb_descriptor_header *) &gs_acm_descriptor,
608 (struct usb_descriptor_header *) &gs_union_desc,
609 (struct usb_descriptor_header *) &gs_highspeed_notify_desc,
610 (struct usb_descriptor_header *) &gs_data_interface_desc,
611 (struct usb_descriptor_header *) &gs_highspeed_in_desc,
612 (struct usb_descriptor_header *) &gs_highspeed_out_desc,
613 NULL,
614 };
615
616 #endif /* CONFIG_USB_GADGET_DUALSPEED */
617
618
619 /* Module */
620 MODULE_DESCRIPTION(GS_LONG_NAME);
621 MODULE_AUTHOR("Al Borchers");
622 MODULE_LICENSE("GPL");
623
624 #ifdef GS_DEBUG
625 module_param(debug, int, S_IRUGO|S_IWUSR);
626 MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
627 #endif
628
629 module_param(read_q_size, uint, S_IRUGO);
630 MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
631
632 module_param(write_q_size, uint, S_IRUGO);
633 MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
634
635 module_param(write_buf_size, uint, S_IRUGO);
636 MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
637
638 module_param(use_acm, uint, S_IRUGO);
639 MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
640
641 module_init(gs_module_init);
642 module_exit(gs_module_exit);
643
644 /*
645 * gs_module_init
646 *
647 * Register as a USB gadget driver and a tty driver.
648 */
649 static int __init gs_module_init(void)
650 {
651 int i;
652 int retval;
653
654 retval = usb_gadget_register_driver(&gs_gadget_driver);
655 if (retval) {
656 printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
657 return retval;
658 }
659
660 gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
661 if (!gs_tty_driver)
662 return -ENOMEM;
663 gs_tty_driver->owner = THIS_MODULE;
664 gs_tty_driver->driver_name = GS_SHORT_NAME;
665 gs_tty_driver->name = "ttygs";
666 gs_tty_driver->devfs_name = "usb/ttygs/";
667 gs_tty_driver->major = GS_MAJOR;
668 gs_tty_driver->minor_start = GS_MINOR_START;
669 gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
670 gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
671 gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
672 gs_tty_driver->init_termios = tty_std_termios;
673 gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
674 tty_set_operations(gs_tty_driver, &gs_tty_ops);
675
676 for (i=0; i < GS_NUM_PORTS; i++)
677 sema_init(&gs_open_close_sem[i], 1);
678
679 retval = tty_register_driver(gs_tty_driver);
680 if (retval) {
681 usb_gadget_unregister_driver(&gs_gadget_driver);
682 put_tty_driver(gs_tty_driver);
683 printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
684 return retval;
685 }
686
687 printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
688 return 0;
689 }
690
691 /*
692 * gs_module_exit
693 *
694 * Unregister as a tty driver and a USB gadget driver.
695 */
696 static void __exit gs_module_exit(void)
697 {
698 tty_unregister_driver(gs_tty_driver);
699 put_tty_driver(gs_tty_driver);
700 usb_gadget_unregister_driver(&gs_gadget_driver);
701
702 printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
703 }
704
705 /* TTY Driver */
706
707 /*
708 * gs_open
709 */
710 static int gs_open(struct tty_struct *tty, struct file *file)
711 {
712 int port_num;
713 unsigned long flags;
714 struct gs_port *port;
715 struct gs_dev *dev;
716 struct gs_buf *buf;
717 struct semaphore *sem;
718 int ret;
719
720 port_num = tty->index;
721
722 gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
723
724 if (port_num < 0 || port_num >= GS_NUM_PORTS) {
725 printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
726 port_num, tty, file);
727 return -ENODEV;
728 }
729
730 dev = gs_device;
731
732 if (dev == NULL) {
733 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
734 port_num, tty, file);
735 return -ENODEV;
736 }
737
738 sem = &gs_open_close_sem[port_num];
739 if (down_interruptible(sem)) {
740 printk(KERN_ERR
741 "gs_open: (%d,%p,%p) interrupted waiting for semaphore\n",
742 port_num, tty, file);
743 return -ERESTARTSYS;
744 }
745
746 spin_lock_irqsave(&dev->dev_lock, flags);
747
748 if (dev->dev_config == GS_NO_CONFIG_ID) {
749 printk(KERN_ERR
750 "gs_open: (%d,%p,%p) device is not connected\n",
751 port_num, tty, file);
752 ret = -ENODEV;
753 goto exit_unlock_dev;
754 }
755
756 port = dev->dev_port[port_num];
757
758 if (port == NULL) {
759 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
760 port_num, tty, file);
761 ret = -ENODEV;
762 goto exit_unlock_dev;
763 }
764
765 spin_lock(&port->port_lock);
766 spin_unlock(&dev->dev_lock);
767
768 if (port->port_dev == NULL) {
769 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
770 port_num, tty, file);
771 ret = -EIO;
772 goto exit_unlock_port;
773 }
774
775 if (port->port_open_count > 0) {
776 ++port->port_open_count;
777 gs_debug("gs_open: (%d,%p,%p) already open\n",
778 port_num, tty, file);
779 ret = 0;
780 goto exit_unlock_port;
781 }
782
783 tty->driver_data = NULL;
784
785 /* mark port as in use, we can drop port lock and sleep if necessary */
786 port->port_in_use = 1;
787
788 /* allocate write buffer on first open */
789 if (port->port_write_buf == NULL) {
790 spin_unlock_irqrestore(&port->port_lock, flags);
791 buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
792 spin_lock_irqsave(&port->port_lock, flags);
793
794 /* might have been disconnected while asleep, check */
795 if (port->port_dev == NULL) {
796 printk(KERN_ERR
797 "gs_open: (%d,%p,%p) port disconnected (2)\n",
798 port_num, tty, file);
799 port->port_in_use = 0;
800 ret = -EIO;
801 goto exit_unlock_port;
802 }
803
804 if ((port->port_write_buf=buf) == NULL) {
805 printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
806 port_num, tty, file);
807 port->port_in_use = 0;
808 ret = -ENOMEM;
809 goto exit_unlock_port;
810 }
811
812 }
813
814 /* wait for carrier detect (not implemented) */
815
816 /* might have been disconnected while asleep, check */
817 if (port->port_dev == NULL) {
818 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
819 port_num, tty, file);
820 port->port_in_use = 0;
821 ret = -EIO;
822 goto exit_unlock_port;
823 }
824
825 tty->driver_data = port;
826 port->port_tty = tty;
827 port->port_open_count = 1;
828 port->port_in_use = 0;
829
830 gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
831
832 ret = 0;
833
834 exit_unlock_port:
835 spin_unlock_irqrestore(&port->port_lock, flags);
836 up(sem);
837 return ret;
838
839 exit_unlock_dev:
840 spin_unlock_irqrestore(&dev->dev_lock, flags);
841 up(sem);
842 return ret;
843
844 }
845
846 /*
847 * gs_close
848 */
849 static void gs_close(struct tty_struct *tty, struct file *file)
850 {
851 unsigned long flags;
852 struct gs_port *port = tty->driver_data;
853 struct semaphore *sem;
854
855 if (port == NULL) {
856 printk(KERN_ERR "gs_close: NULL port pointer\n");
857 return;
858 }
859
860 gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
861
862 sem = &gs_open_close_sem[port->port_num];
863 down(sem);
864
865 spin_lock_irqsave(&port->port_lock, flags);
866
867 if (port->port_open_count == 0) {
868 printk(KERN_ERR
869 "gs_close: (%d,%p,%p) port is already closed\n",
870 port->port_num, tty, file);
871 goto exit;
872 }
873
874 if (port->port_open_count > 1) {
875 --port->port_open_count;
876 goto exit;
877 }
878
879 /* free disconnected port on final close */
880 if (port->port_dev == NULL) {
881 kfree(port);
882 goto exit;
883 }
884
885 /* mark port as closed but in use, we can drop port lock */
886 /* and sleep if necessary */
887 port->port_in_use = 1;
888 port->port_open_count = 0;
889
890 /* wait for write buffer to drain, or */
891 /* at most GS_CLOSE_TIMEOUT seconds */
892 if (gs_buf_data_avail(port->port_write_buf) > 0) {
893 wait_cond_interruptible_timeout(port->port_write_wait,
894 port->port_dev == NULL
895 || gs_buf_data_avail(port->port_write_buf) == 0,
896 &port->port_lock, flags, GS_CLOSE_TIMEOUT * HZ);
897 }
898
899 /* free disconnected port on final close */
900 /* (might have happened during the above sleep) */
901 if (port->port_dev == NULL) {
902 kfree(port);
903 goto exit;
904 }
905
906 gs_buf_clear(port->port_write_buf);
907
908 tty->driver_data = NULL;
909 port->port_tty = NULL;
910 port->port_in_use = 0;
911
912 gs_debug("gs_close: (%d,%p,%p) completed\n",
913 port->port_num, tty, file);
914
915 exit:
916 spin_unlock_irqrestore(&port->port_lock, flags);
917 up(sem);
918 }
919
920 /*
921 * gs_write
922 */
923 static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
924 {
925 unsigned long flags;
926 struct gs_port *port = tty->driver_data;
927 int ret;
928
929 if (port == NULL) {
930 printk(KERN_ERR "gs_write: NULL port pointer\n");
931 return -EIO;
932 }
933
934 gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
935 count);
936
937 if (count == 0)
938 return 0;
939
940 spin_lock_irqsave(&port->port_lock, flags);
941
942 if (port->port_dev == NULL) {
943 printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
944 port->port_num, tty);
945 ret = -EIO;
946 goto exit;
947 }
948
949 if (port->port_open_count == 0) {
950 printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
951 port->port_num, tty);
952 ret = -EBADF;
953 goto exit;
954 }
955
956 count = gs_buf_put(port->port_write_buf, buf, count);
957
958 spin_unlock_irqrestore(&port->port_lock, flags);
959
960 gs_send(gs_device);
961
962 gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
963 count);
964
965 return count;
966
967 exit:
968 spin_unlock_irqrestore(&port->port_lock, flags);
969 return ret;
970 }
971
972 /*
973 * gs_put_char
974 */
975 static void gs_put_char(struct tty_struct *tty, unsigned char ch)
976 {
977 unsigned long flags;
978 struct gs_port *port = tty->driver_data;
979
980 if (port == NULL) {
981 printk(KERN_ERR "gs_put_char: NULL port pointer\n");
982 return;
983 }
984
985 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));
986
987 spin_lock_irqsave(&port->port_lock, flags);
988
989 if (port->port_dev == NULL) {
990 printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
991 port->port_num, tty);
992 goto exit;
993 }
994
995 if (port->port_open_count == 0) {
996 printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
997 port->port_num, tty);
998 goto exit;
999 }
1000
1001 gs_buf_put(port->port_write_buf, &ch, 1);
1002
1003 exit:
1004 spin_unlock_irqrestore(&port->port_lock, flags);
1005 }
1006
1007 /*
1008 * gs_flush_chars
1009 */
1010 static void gs_flush_chars(struct tty_struct *tty)
1011 {
1012 unsigned long flags;
1013 struct gs_port *port = tty->driver_data;
1014
1015 if (port == NULL) {
1016 printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
1017 return;
1018 }
1019
1020 gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
1021
1022 spin_lock_irqsave(&port->port_lock, flags);
1023
1024 if (port->port_dev == NULL) {
1025 printk(KERN_ERR
1026 "gs_flush_chars: (%d,%p) port is not connected\n",
1027 port->port_num, tty);
1028 goto exit;
1029 }
1030
1031 if (port->port_open_count == 0) {
1032 printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
1033 port->port_num, tty);
1034 goto exit;
1035 }
1036
1037 spin_unlock_irqrestore(&port->port_lock, flags);
1038
1039 gs_send(gs_device);
1040
1041 return;
1042
1043 exit:
1044 spin_unlock_irqrestore(&port->port_lock, flags);
1045 }
1046
1047 /*
1048 * gs_write_room
1049 */
1050 static int gs_write_room(struct tty_struct *tty)
1051 {
1052
1053 int room = 0;
1054 unsigned long flags;
1055 struct gs_port *port = tty->driver_data;
1056
1057
1058 if (port == NULL)
1059 return 0;
1060
1061 spin_lock_irqsave(&port->port_lock, flags);
1062
1063 if (port->port_dev != NULL && port->port_open_count > 0
1064 && port->port_write_buf != NULL)
1065 room = gs_buf_space_avail(port->port_write_buf);
1066
1067 spin_unlock_irqrestore(&port->port_lock, flags);
1068
1069 gs_debug("gs_write_room: (%d,%p) room=%d\n",
1070 port->port_num, tty, room);
1071
1072 return room;
1073 }
1074
1075 /*
1076 * gs_chars_in_buffer
1077 */
1078 static int gs_chars_in_buffer(struct tty_struct *tty)
1079 {
1080 int chars = 0;
1081 unsigned long flags;
1082 struct gs_port *port = tty->driver_data;
1083
1084 if (port == NULL)
1085 return 0;
1086
1087 spin_lock_irqsave(&port->port_lock, flags);
1088
1089 if (port->port_dev != NULL && port->port_open_count > 0
1090 && port->port_write_buf != NULL)
1091 chars = gs_buf_data_avail(port->port_write_buf);
1092
1093 spin_unlock_irqrestore(&port->port_lock, flags);
1094
1095 gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
1096 port->port_num, tty, chars);
1097
1098 return chars;
1099 }
1100
1101 /*
1102 * gs_throttle
1103 */
1104 static void gs_throttle(struct tty_struct *tty)
1105 {
1106 }
1107
1108 /*
1109 * gs_unthrottle
1110 */
1111 static void gs_unthrottle(struct tty_struct *tty)
1112 {
1113 }
1114
1115 /*
1116 * gs_break
1117 */
1118 static void gs_break(struct tty_struct *tty, int break_state)
1119 {
1120 }
1121
1122 /*
1123 * gs_ioctl
1124 */
1125 static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1126 {
1127 struct gs_port *port = tty->driver_data;
1128
1129 if (port == NULL) {
1130 printk(KERN_ERR "gs_ioctl: NULL port pointer\n");
1131 return -EIO;
1132 }
1133
1134 gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
1135 port->port_num, tty, file, cmd, arg);
1136
1137 /* handle ioctls */
1138
1139 /* could not handle ioctl */
1140 return -ENOIOCTLCMD;
1141 }
1142
1143 /*
1144 * gs_set_termios
1145 */
1146 static void gs_set_termios(struct tty_struct *tty, struct termios *old)
1147 {
1148 }
1149
1150 /*
1151 * gs_send
1152 *
1153 * This function finds available write requests, calls
1154 * gs_send_packet to fill these packets with data, and
1155 * continues until either there are no more write requests
1156 * available or no more data to send. This function is
1157 * run whenever data arrives or write requests are available.
1158 */
1159 static int gs_send(struct gs_dev *dev)
1160 {
1161 int ret,len;
1162 unsigned long flags;
1163 struct usb_ep *ep;
1164 struct usb_request *req;
1165 struct gs_req_entry *req_entry;
1166
1167 if (dev == NULL) {
1168 printk(KERN_ERR "gs_send: NULL device pointer\n");
1169 return -ENODEV;
1170 }
1171
1172 spin_lock_irqsave(&dev->dev_lock, flags);
1173
1174 ep = dev->dev_in_ep;
1175
1176 while(!list_empty(&dev->dev_req_list)) {
1177
1178 req_entry = list_entry(dev->dev_req_list.next,
1179 struct gs_req_entry, re_entry);
1180
1181 req = req_entry->re_req;
1182
1183 len = gs_send_packet(dev, req->buf, ep->maxpacket);
1184
1185 if (len > 0) {
1186 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));
1187 list_del(&req_entry->re_entry);
1188 req->length = len;
1189 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1190 printk(KERN_ERR
1191 "gs_send: cannot queue read request, ret=%d\n",
1192 ret);
1193 break;
1194 }
1195 } else {
1196 break;
1197 }
1198
1199 }
1200
1201 spin_unlock_irqrestore(&dev->dev_lock, flags);
1202
1203 return 0;
1204 }
1205
1206 /*
1207 * gs_send_packet
1208 *
1209 * If there is data to send, a packet is built in the given
1210 * buffer and the size is returned. If there is no data to
1211 * send, 0 is returned. If there is any error a negative
1212 * error number is returned.
1213 *
1214 * Called during USB completion routine, on interrupt time.
1215 *
1216 * We assume that disconnect will not happen until all completion
1217 * routines have completed, so we can assume that the dev_port
1218 * array does not change during the lifetime of this function.
1219 */
1220 static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
1221 {
1222 unsigned int len;
1223 struct gs_port *port;
1224
1225 /* TEMPORARY -- only port 0 is supported right now */
1226 port = dev->dev_port[0];
1227
1228 if (port == NULL) {
1229 printk(KERN_ERR
1230 "gs_send_packet: port=%d, NULL port pointer\n",
1231 0);
1232 return -EIO;
1233 }
1234
1235 spin_lock(&port->port_lock);
1236
1237 len = gs_buf_data_avail(port->port_write_buf);
1238 if (len < size)
1239 size = len;
1240
1241 if (size == 0)
1242 goto exit;
1243
1244 size = gs_buf_get(port->port_write_buf, packet, size);
1245
1246 if (port->port_tty)
1247 wake_up_interruptible(&port->port_tty->write_wait);
1248
1249 exit:
1250 spin_unlock(&port->port_lock);
1251 return size;
1252 }
1253
1254 /*
1255 * gs_recv_packet
1256 *
1257 * Called for each USB packet received. Reads the packet
1258 * header and stuffs the data in the appropriate tty buffer.
1259 * Returns 0 if successful, or a negative error number.
1260 *
1261 * Called during USB completion routine, on interrupt time.
1262 *
1263 * We assume that disconnect will not happen until all completion
1264 * routines have completed, so we can assume that the dev_port
1265 * array does not change during the lifetime of this function.
1266 */
1267 static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
1268 {
1269 unsigned int len;
1270 struct gs_port *port;
1271 int ret;
1272
1273 /* TEMPORARY -- only port 0 is supported right now */
1274 port = dev->dev_port[0];
1275
1276 if (port == NULL) {
1277 printk(KERN_ERR "gs_recv_packet: port=%d, NULL port pointer\n",
1278 port->port_num);
1279 return -EIO;
1280 }
1281
1282 spin_lock(&port->port_lock);
1283
1284 if (port->port_open_count == 0) {
1285 printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
1286 port->port_num);
1287 ret = -EIO;
1288 goto exit;
1289 }
1290
1291 if (port->port_tty == NULL) {
1292 printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
1293 port->port_num);
1294 ret = -EIO;
1295 goto exit;
1296 }
1297
1298 if (port->port_tty->magic != TTY_MAGIC) {
1299 printk(KERN_ERR "gs_recv_packet: port=%d, bad tty magic\n",
1300 port->port_num);
1301 ret = -EIO;
1302 goto exit;
1303 }
1304
1305 len = (unsigned int)(TTY_FLIPBUF_SIZE - port->port_tty->flip.count);
1306 if (len < size)
1307 size = len;
1308
1309 if (size > 0) {
1310 memcpy(port->port_tty->flip.char_buf_ptr, packet, size);
1311 port->port_tty->flip.char_buf_ptr += size;
1312 port->port_tty->flip.count += size;
1313 tty_flip_buffer_push(port->port_tty);
1314 wake_up_interruptible(&port->port_tty->read_wait);
1315 }
1316
1317 ret = 0;
1318
1319 exit:
1320 spin_unlock(&port->port_lock);
1321 return ret;
1322 }
1323
1324 /*
1325 * gs_read_complete
1326 */
1327 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
1328 {
1329 int ret;
1330 struct gs_dev *dev = ep->driver_data;
1331
1332 if (dev == NULL) {
1333 printk(KERN_ERR "gs_read_complete: NULL device pointer\n");
1334 return;
1335 }
1336
1337 switch(req->status) {
1338 case 0:
1339 /* normal completion */
1340 gs_recv_packet(dev, req->buf, req->actual);
1341 requeue:
1342 req->length = ep->maxpacket;
1343 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1344 printk(KERN_ERR
1345 "gs_read_complete: cannot queue read request, ret=%d\n",
1346 ret);
1347 }
1348 break;
1349
1350 case -ESHUTDOWN:
1351 /* disconnect */
1352 gs_debug("gs_read_complete: shutdown\n");
1353 gs_free_req(ep, req);
1354 break;
1355
1356 default:
1357 /* unexpected */
1358 printk(KERN_ERR
1359 "gs_read_complete: unexpected status error, status=%d\n",
1360 req->status);
1361 goto requeue;
1362 break;
1363 }
1364 }
1365
1366 /*
1367 * gs_write_complete
1368 */
1369 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
1370 {
1371 struct gs_dev *dev = ep->driver_data;
1372 struct gs_req_entry *gs_req = req->context;
1373
1374 if (dev == NULL) {
1375 printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
1376 return;
1377 }
1378
1379 switch(req->status) {
1380 case 0:
1381 /* normal completion */
1382 requeue:
1383 if (gs_req == NULL) {
1384 printk(KERN_ERR
1385 "gs_write_complete: NULL request pointer\n");
1386 return;
1387 }
1388
1389 spin_lock(&dev->dev_lock);
1390 list_add(&gs_req->re_entry, &dev->dev_req_list);
1391 spin_unlock(&dev->dev_lock);
1392
1393 gs_send(dev);
1394
1395 break;
1396
1397 case -ESHUTDOWN:
1398 /* disconnect */
1399 gs_debug("gs_write_complete: shutdown\n");
1400 gs_free_req(ep, req);
1401 break;
1402
1403 default:
1404 printk(KERN_ERR
1405 "gs_write_complete: unexpected status error, status=%d\n",
1406 req->status);
1407 goto requeue;
1408 break;
1409 }
1410 }
1411
1412 /* Gadget Driver */
1413
1414 /*
1415 * gs_bind
1416 *
1417 * Called on module load. Allocates and initializes the device
1418 * structure and a control request.
1419 */
1420 static int gs_bind(struct usb_gadget *gadget)
1421 {
1422 int ret;
1423 struct usb_ep *ep;
1424 struct gs_dev *dev;
1425 int gcnum;
1426
1427 /* Some controllers can't support CDC ACM:
1428 * - sh doesn't support multiple interfaces or configs;
1429 * - sa1100 doesn't have a third interrupt endpoint
1430 */
1431 if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
1432 use_acm = 0;
1433
1434 gcnum = usb_gadget_controller_number(gadget);
1435 if (gcnum >= 0)
1436 gs_device_desc.bcdDevice =
1437 cpu_to_le16(GS_VERSION_NUM | gcnum);
1438 else {
1439 printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
1440 gadget->name);
1441 /* unrecognized, but safe unless bulk is REALLY quirky */
1442 gs_device_desc.bcdDevice =
1443 __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
1444 }
1445
1446 usb_ep_autoconfig_reset(gadget);
1447
1448 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1449 if (!ep)
1450 goto autoconf_fail;
1451 EP_IN_NAME = ep->name;
1452 ep->driver_data = ep; /* claim the endpoint */
1453
1454 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1455 if (!ep)
1456 goto autoconf_fail;
1457 EP_OUT_NAME = ep->name;
1458 ep->driver_data = ep; /* claim the endpoint */
1459
1460 if (use_acm) {
1461 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
1462 if (!ep) {
1463 printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
1464 goto autoconf_fail;
1465 }
1466 gs_device_desc.idProduct = __constant_cpu_to_le16(
1467 GS_CDC_PRODUCT_ID),
1468 EP_NOTIFY_NAME = ep->name;
1469 ep->driver_data = ep; /* claim the endpoint */
1470 }
1471
1472 gs_device_desc.bDeviceClass = use_acm
1473 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1474 gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1475
1476 #ifdef CONFIG_USB_GADGET_DUALSPEED
1477 gs_qualifier_desc.bDeviceClass = use_acm
1478 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1479 /* assume ep0 uses the same packet size for both speeds */
1480 gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
1481 /* assume endpoints are dual-speed */
1482 gs_highspeed_notify_desc.bEndpointAddress =
1483 gs_fullspeed_notify_desc.bEndpointAddress;
1484 gs_highspeed_in_desc.bEndpointAddress =
1485 gs_fullspeed_in_desc.bEndpointAddress;
1486 gs_highspeed_out_desc.bEndpointAddress =
1487 gs_fullspeed_out_desc.bEndpointAddress;
1488 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1489
1490 usb_gadget_set_selfpowered(gadget);
1491
1492 if (gadget->is_otg) {
1493 gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
1494 gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1495 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1496 }
1497
1498 gs_device = dev = kmalloc(sizeof(struct gs_dev), GFP_KERNEL);
1499 if (dev == NULL)
1500 return -ENOMEM;
1501
1502 snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1503 system_utsname.sysname, system_utsname.release,
1504 gadget->name);
1505
1506 memset(dev, 0, sizeof(struct gs_dev));
1507 dev->dev_gadget = gadget;
1508 spin_lock_init(&dev->dev_lock);
1509 INIT_LIST_HEAD(&dev->dev_req_list);
1510 set_gadget_data(gadget, dev);
1511
1512 if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1513 printk(KERN_ERR "gs_bind: cannot allocate ports\n");
1514 gs_unbind(gadget);
1515 return ret;
1516 }
1517
1518 /* preallocate control response and buffer */
1519 dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1520 GFP_KERNEL);
1521 if (dev->dev_ctrl_req == NULL) {
1522 gs_unbind(gadget);
1523 return -ENOMEM;
1524 }
1525 dev->dev_ctrl_req->complete = gs_setup_complete;
1526
1527 gadget->ep0->driver_data = dev;
1528
1529 printk(KERN_INFO "gs_bind: %s %s bound\n",
1530 GS_LONG_NAME, GS_VERSION_STR);
1531
1532 return 0;
1533
1534 autoconf_fail:
1535 printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
1536 return -ENODEV;
1537 }
1538
1539 /*
1540 * gs_unbind
1541 *
1542 * Called on module unload. Frees the control request and device
1543 * structure.
1544 */
1545 static void gs_unbind(struct usb_gadget *gadget)
1546 {
1547 struct gs_dev *dev = get_gadget_data(gadget);
1548
1549 gs_device = NULL;
1550
1551 /* read/write requests already freed, only control request remains */
1552 if (dev != NULL) {
1553 if (dev->dev_ctrl_req != NULL) {
1554 gs_free_req(gadget->ep0, dev->dev_ctrl_req);
1555 dev->dev_ctrl_req = NULL;
1556 }
1557 gs_free_ports(dev);
1558 kfree(dev);
1559 set_gadget_data(gadget, NULL);
1560 }
1561
1562 printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
1563 GS_VERSION_STR);
1564 }
1565
1566 /*
1567 * gs_setup
1568 *
1569 * Implements all the control endpoint functionality that's not
1570 * handled in hardware or the hardware driver.
1571 *
1572 * Returns the size of the data sent to the host, or a negative
1573 * error number.
1574 */
1575 static int gs_setup(struct usb_gadget *gadget,
1576 const struct usb_ctrlrequest *ctrl)
1577 {
1578 int ret = -EOPNOTSUPP;
1579 struct gs_dev *dev = get_gadget_data(gadget);
1580 struct usb_request *req = dev->dev_ctrl_req;
1581 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1582 u16 wValue = le16_to_cpu(ctrl->wValue);
1583 u16 wLength = le16_to_cpu(ctrl->wLength);
1584
1585 switch (ctrl->bRequestType & USB_TYPE_MASK) {
1586 case USB_TYPE_STANDARD:
1587 ret = gs_setup_standard(gadget,ctrl);
1588 break;
1589
1590 case USB_TYPE_CLASS:
1591 ret = gs_setup_class(gadget,ctrl);
1592 break;
1593
1594 default:
1595 printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1596 ctrl->bRequestType, ctrl->bRequest,
1597 wValue, wIndex, wLength);
1598 break;
1599 }
1600
1601 /* respond with data transfer before status phase? */
1602 if (ret >= 0) {
1603 req->length = ret;
1604 req->zero = ret < wLength
1605 && (ret % gadget->ep0->maxpacket) == 0;
1606 ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1607 if (ret < 0) {
1608 printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
1609 ret);
1610 req->status = 0;
1611 gs_setup_complete(gadget->ep0, req);
1612 }
1613 }
1614
1615 /* device either stalls (ret < 0) or reports success */
1616 return ret;
1617 }
1618
1619 static int gs_setup_standard(struct usb_gadget *gadget,
1620 const struct usb_ctrlrequest *ctrl)
1621 {
1622 int ret = -EOPNOTSUPP;
1623 struct gs_dev *dev = get_gadget_data(gadget);
1624 struct usb_request *req = dev->dev_ctrl_req;
1625 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1626 u16 wValue = le16_to_cpu(ctrl->wValue);
1627 u16 wLength = le16_to_cpu(ctrl->wLength);
1628
1629 switch (ctrl->bRequest) {
1630 case USB_REQ_GET_DESCRIPTOR:
1631 if (ctrl->bRequestType != USB_DIR_IN)
1632 break;
1633
1634 switch (wValue >> 8) {
1635 case USB_DT_DEVICE:
1636 ret = min(wLength,
1637 (u16)sizeof(struct usb_device_descriptor));
1638 memcpy(req->buf, &gs_device_desc, ret);
1639 break;
1640
1641 #ifdef CONFIG_USB_GADGET_DUALSPEED
1642 case USB_DT_DEVICE_QUALIFIER:
1643 if (!gadget->is_dualspeed)
1644 break;
1645 ret = min(wLength,
1646 (u16)sizeof(struct usb_qualifier_descriptor));
1647 memcpy(req->buf, &gs_qualifier_desc, ret);
1648 break;
1649
1650 case USB_DT_OTHER_SPEED_CONFIG:
1651 if (!gadget->is_dualspeed)
1652 break;
1653 /* fall through */
1654 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1655 case USB_DT_CONFIG:
1656 ret = gs_build_config_buf(req->buf, gadget->speed,
1657 wValue >> 8, wValue & 0xff,
1658 gadget->is_otg);
1659 if (ret >= 0)
1660 ret = min(wLength, (u16)ret);
1661 break;
1662
1663 case USB_DT_STRING:
1664 /* wIndex == language code. */
1665 ret = usb_gadget_get_string(&gs_string_table,
1666 wValue & 0xff, req->buf);
1667 if (ret >= 0)
1668 ret = min(wLength, (u16)ret);
1669 break;
1670 }
1671 break;
1672
1673 case USB_REQ_SET_CONFIGURATION:
1674 if (ctrl->bRequestType != 0)
1675 break;
1676 spin_lock(&dev->dev_lock);
1677 ret = gs_set_config(dev, wValue);
1678 spin_unlock(&dev->dev_lock);
1679 break;
1680
1681 case USB_REQ_GET_CONFIGURATION:
1682 if (ctrl->bRequestType != USB_DIR_IN)
1683 break;
1684 *(u8 *)req->buf = dev->dev_config;
1685 ret = min(wLength, (u16)1);
1686 break;
1687
1688 case USB_REQ_SET_INTERFACE:
1689 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1690 || !dev->dev_config
1691 || wIndex >= GS_MAX_NUM_INTERFACES)
1692 break;
1693 if (dev->dev_config == GS_BULK_CONFIG_ID
1694 && wIndex != GS_BULK_INTERFACE_ID)
1695 break;
1696 /* no alternate interface settings */
1697 if (wValue != 0)
1698 break;
1699 spin_lock(&dev->dev_lock);
1700 /* PXA hardware partially handles SET_INTERFACE;
1701 * we need to kluge around that interference. */
1702 if (gadget_is_pxa(gadget)) {
1703 ret = gs_set_config(dev, use_acm ?
1704 GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
1705 goto set_interface_done;
1706 }
1707 if (dev->dev_config != GS_BULK_CONFIG_ID
1708 && wIndex == GS_CONTROL_INTERFACE_ID) {
1709 if (dev->dev_notify_ep) {
1710 usb_ep_disable(dev->dev_notify_ep);
1711 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
1712 }
1713 } else {
1714 usb_ep_disable(dev->dev_in_ep);
1715 usb_ep_disable(dev->dev_out_ep);
1716 usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1717 usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1718 }
1719 ret = 0;
1720 set_interface_done:
1721 spin_unlock(&dev->dev_lock);
1722 break;
1723
1724 case USB_REQ_GET_INTERFACE:
1725 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1726 || dev->dev_config == GS_NO_CONFIG_ID)
1727 break;
1728 if (wIndex >= GS_MAX_NUM_INTERFACES
1729 || (dev->dev_config == GS_BULK_CONFIG_ID
1730 && wIndex != GS_BULK_INTERFACE_ID)) {
1731 ret = -EDOM;
1732 break;
1733 }
1734 /* no alternate interface settings */
1735 *(u8 *)req->buf = 0;
1736 ret = min(wLength, (u16)1);
1737 break;
1738
1739 default:
1740 printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1741 ctrl->bRequestType, ctrl->bRequest,
1742 wValue, wIndex, wLength);
1743 break;
1744 }
1745
1746 return ret;
1747 }
1748
1749 static int gs_setup_class(struct usb_gadget *gadget,
1750 const struct usb_ctrlrequest *ctrl)
1751 {
1752 int ret = -EOPNOTSUPP;
1753 struct gs_dev *dev = get_gadget_data(gadget);
1754 struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
1755 struct usb_request *req = dev->dev_ctrl_req;
1756 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1757 u16 wValue = le16_to_cpu(ctrl->wValue);
1758 u16 wLength = le16_to_cpu(ctrl->wLength);
1759
1760 switch (ctrl->bRequest) {
1761 case USB_CDC_REQ_SET_LINE_CODING:
1762 ret = min(wLength,
1763 (u16)sizeof(struct usb_cdc_line_coding));
1764 if (port) {
1765 spin_lock(&port->port_lock);
1766 memcpy(&port->port_line_coding, req->buf, ret);
1767 spin_unlock(&port->port_lock);
1768 }
1769 break;
1770
1771 case USB_CDC_REQ_GET_LINE_CODING:
1772 port = dev->dev_port[0]; /* ACM only has one port */
1773 ret = min(wLength,
1774 (u16)sizeof(struct usb_cdc_line_coding));
1775 if (port) {
1776 spin_lock(&port->port_lock);
1777 memcpy(req->buf, &port->port_line_coding, ret);
1778 spin_unlock(&port->port_lock);
1779 }
1780 break;
1781
1782 case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1783 ret = 0;
1784 break;
1785
1786 default:
1787 printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1788 ctrl->bRequestType, ctrl->bRequest,
1789 wValue, wIndex, wLength);
1790 break;
1791 }
1792
1793 return ret;
1794 }
1795
1796 /*
1797 * gs_setup_complete
1798 */
1799 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
1800 {
1801 if (req->status || req->actual != req->length) {
1802 printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
1803 req->status, req->actual, req->length);
1804 }
1805 }
1806
1807 /*
1808 * gs_disconnect
1809 *
1810 * Called when the device is disconnected. Frees the closed
1811 * ports and disconnects open ports. Open ports will be freed
1812 * on close. Then reallocates the ports for the next connection.
1813 */
1814 static void gs_disconnect(struct usb_gadget *gadget)
1815 {
1816 unsigned long flags;
1817 struct gs_dev *dev = get_gadget_data(gadget);
1818
1819 spin_lock_irqsave(&dev->dev_lock, flags);
1820
1821 gs_reset_config(dev);
1822
1823 /* free closed ports and disconnect open ports */
1824 /* (open ports will be freed when closed) */
1825 gs_free_ports(dev);
1826
1827 /* re-allocate ports for the next connection */
1828 if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1829 printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
1830
1831 spin_unlock_irqrestore(&dev->dev_lock, flags);
1832
1833 printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
1834 }
1835
1836 /*
1837 * gs_set_config
1838 *
1839 * Configures the device by enabling device specific
1840 * optimizations, setting up the endpoints, allocating
1841 * read and write requests and queuing read requests.
1842 *
1843 * The device lock must be held when calling this function.
1844 */
1845 static int gs_set_config(struct gs_dev *dev, unsigned config)
1846 {
1847 int i;
1848 int ret = 0;
1849 struct usb_gadget *gadget = dev->dev_gadget;
1850 struct usb_ep *ep;
1851 struct usb_endpoint_descriptor *ep_desc;
1852 struct usb_request *req;
1853 struct gs_req_entry *req_entry;
1854
1855 if (dev == NULL) {
1856 printk(KERN_ERR "gs_set_config: NULL device pointer\n");
1857 return 0;
1858 }
1859
1860 if (config == dev->dev_config)
1861 return 0;
1862
1863 gs_reset_config(dev);
1864
1865 switch (config) {
1866 case GS_NO_CONFIG_ID:
1867 return 0;
1868 case GS_BULK_CONFIG_ID:
1869 if (use_acm)
1870 return -EINVAL;
1871 /* device specific optimizations */
1872 if (gadget_is_net2280(gadget))
1873 net2280_set_fifo_mode(gadget, 1);
1874 break;
1875 case GS_ACM_CONFIG_ID:
1876 if (!use_acm)
1877 return -EINVAL;
1878 /* device specific optimizations */
1879 if (gadget_is_net2280(gadget))
1880 net2280_set_fifo_mode(gadget, 1);
1881 break;
1882 default:
1883 return -EINVAL;
1884 }
1885
1886 dev->dev_config = config;
1887
1888 gadget_for_each_ep(ep, gadget) {
1889
1890 if (EP_NOTIFY_NAME
1891 && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
1892 ep_desc = GS_SPEED_SELECT(
1893 gadget->speed == USB_SPEED_HIGH,
1894 &gs_highspeed_notify_desc,
1895 &gs_fullspeed_notify_desc);
1896 ret = usb_ep_enable(ep,ep_desc);
1897 if (ret == 0) {
1898 ep->driver_data = dev;
1899 dev->dev_notify_ep = ep;
1900 dev->dev_notify_ep_desc = ep_desc;
1901 } else {
1902 printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
1903 ep->name, ret);
1904 goto exit_reset_config;
1905 }
1906 }
1907
1908 else if (strcmp(ep->name, EP_IN_NAME) == 0) {
1909 ep_desc = GS_SPEED_SELECT(
1910 gadget->speed == USB_SPEED_HIGH,
1911 &gs_highspeed_in_desc,
1912 &gs_fullspeed_in_desc);
1913 ret = usb_ep_enable(ep,ep_desc);
1914 if (ret == 0) {
1915 ep->driver_data = dev;
1916 dev->dev_in_ep = ep;
1917 dev->dev_in_ep_desc = ep_desc;
1918 } else {
1919 printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
1920 ep->name, ret);
1921 goto exit_reset_config;
1922 }
1923 }
1924
1925 else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
1926 ep_desc = GS_SPEED_SELECT(
1927 gadget->speed == USB_SPEED_HIGH,
1928 &gs_highspeed_out_desc,
1929 &gs_fullspeed_out_desc);
1930 ret = usb_ep_enable(ep,ep_desc);
1931 if (ret == 0) {
1932 ep->driver_data = dev;
1933 dev->dev_out_ep = ep;
1934 dev->dev_out_ep_desc = ep_desc;
1935 } else {
1936 printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
1937 ep->name, ret);
1938 goto exit_reset_config;
1939 }
1940 }
1941
1942 }
1943
1944 if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
1945 || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
1946 printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
1947 ret = -ENODEV;
1948 goto exit_reset_config;
1949 }
1950
1951 /* allocate and queue read requests */
1952 ep = dev->dev_out_ep;
1953 for (i=0; i<read_q_size && ret == 0; i++) {
1954 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1955 req->complete = gs_read_complete;
1956 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1957 printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
1958 ret);
1959 }
1960 } else {
1961 printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
1962 ret = -ENOMEM;
1963 goto exit_reset_config;
1964 }
1965 }
1966
1967 /* allocate write requests, and put on free list */
1968 ep = dev->dev_in_ep;
1969 for (i=0; i<write_q_size; i++) {
1970 if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
1971 req_entry->re_req->complete = gs_write_complete;
1972 list_add(&req_entry->re_entry, &dev->dev_req_list);
1973 } else {
1974 printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
1975 ret = -ENOMEM;
1976 goto exit_reset_config;
1977 }
1978 }
1979
1980 printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
1981 GS_LONG_NAME,
1982 gadget->speed == USB_SPEED_HIGH ? "high" : "full",
1983 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
1984
1985 return 0;
1986
1987 exit_reset_config:
1988 gs_reset_config(dev);
1989 return ret;
1990 }
1991
1992 /*
1993 * gs_reset_config
1994 *
1995 * Mark the device as not configured, disable all endpoints,
1996 * which forces completion of pending I/O and frees queued
1997 * requests, and free the remaining write requests on the
1998 * free list.
1999 *
2000 * The device lock must be held when calling this function.
2001 */
2002 static void gs_reset_config(struct gs_dev *dev)
2003 {
2004 struct gs_req_entry *req_entry;
2005
2006 if (dev == NULL) {
2007 printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
2008 return;
2009 }
2010
2011 if (dev->dev_config == GS_NO_CONFIG_ID)
2012 return;
2013
2014 dev->dev_config = GS_NO_CONFIG_ID;
2015
2016 /* free write requests on the free list */
2017 while(!list_empty(&dev->dev_req_list)) {
2018 req_entry = list_entry(dev->dev_req_list.next,
2019 struct gs_req_entry, re_entry);
2020 list_del(&req_entry->re_entry);
2021 gs_free_req_entry(dev->dev_in_ep, req_entry);
2022 }
2023
2024 /* disable endpoints, forcing completion of pending i/o; */
2025 /* completion handlers free their requests in this case */
2026 if (dev->dev_notify_ep) {
2027 usb_ep_disable(dev->dev_notify_ep);
2028 dev->dev_notify_ep = NULL;
2029 }
2030 if (dev->dev_in_ep) {
2031 usb_ep_disable(dev->dev_in_ep);
2032 dev->dev_in_ep = NULL;
2033 }
2034 if (dev->dev_out_ep) {
2035 usb_ep_disable(dev->dev_out_ep);
2036 dev->dev_out_ep = NULL;
2037 }
2038 }
2039
2040 /*
2041 * gs_build_config_buf
2042 *
2043 * Builds the config descriptors in the given buffer and returns the
2044 * length, or a negative error number.
2045 */
2046 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
2047 u8 type, unsigned int index, int is_otg)
2048 {
2049 int len;
2050 int high_speed;
2051 const struct usb_config_descriptor *config_desc;
2052 const struct usb_descriptor_header **function;
2053
2054 if (index >= gs_device_desc.bNumConfigurations)
2055 return -EINVAL;
2056
2057 /* other speed switches high and full speed */
2058 high_speed = (speed == USB_SPEED_HIGH);
2059 if (type == USB_DT_OTHER_SPEED_CONFIG)
2060 high_speed = !high_speed;
2061
2062 if (use_acm) {
2063 config_desc = &gs_acm_config_desc;
2064 function = GS_SPEED_SELECT(high_speed,
2065 gs_acm_highspeed_function,
2066 gs_acm_fullspeed_function);
2067 } else {
2068 config_desc = &gs_bulk_config_desc;
2069 function = GS_SPEED_SELECT(high_speed,
2070 gs_bulk_highspeed_function,
2071 gs_bulk_fullspeed_function);
2072 }
2073
2074 /* for now, don't advertise srp-only devices */
2075 if (!is_otg)
2076 function++;
2077
2078 len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
2079 if (len < 0)
2080 return len;
2081
2082 ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
2083
2084 return len;
2085 }
2086
2087 /*
2088 * gs_alloc_req
2089 *
2090 * Allocate a usb_request and its buffer. Returns a pointer to the
2091 * usb_request or NULL if there is an error.
2092 */
2093 static struct usb_request *
2094 gs_alloc_req(struct usb_ep *ep, unsigned int len, unsigned kmalloc_flags)
2095 {
2096 struct usb_request *req;
2097
2098 if (ep == NULL)
2099 return NULL;
2100
2101 req = usb_ep_alloc_request(ep, kmalloc_flags);
2102
2103 if (req != NULL) {
2104 req->length = len;
2105 req->buf = kmalloc(len, kmalloc_flags);
2106 if (req->buf == NULL) {
2107 usb_ep_free_request(ep, req);
2108 return NULL;
2109 }
2110 }
2111
2112 return req;
2113 }
2114
2115 /*
2116 * gs_free_req
2117 *
2118 * Free a usb_request and its buffer.
2119 */
2120 static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
2121 {
2122 if (ep != NULL && req != NULL) {
2123 kfree(req->buf);
2124 usb_ep_free_request(ep, req);
2125 }
2126 }
2127
2128 /*
2129 * gs_alloc_req_entry
2130 *
2131 * Allocates a request and its buffer, using the given
2132 * endpoint, buffer len, and kmalloc flags.
2133 */
2134 static struct gs_req_entry *
2135 gs_alloc_req_entry(struct usb_ep *ep, unsigned len, unsigned kmalloc_flags)
2136 {
2137 struct gs_req_entry *req;
2138
2139 req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
2140 if (req == NULL)
2141 return NULL;
2142
2143 req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
2144 if (req->re_req == NULL) {
2145 kfree(req);
2146 return NULL;
2147 }
2148
2149 req->re_req->context = req;
2150
2151 return req;
2152 }
2153
2154 /*
2155 * gs_free_req_entry
2156 *
2157 * Frees a request and its buffer.
2158 */
2159 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
2160 {
2161 if (ep != NULL && req != NULL) {
2162 if (req->re_req != NULL)
2163 gs_free_req(ep, req->re_req);
2164 kfree(req);
2165 }
2166 }
2167
2168 /*
2169 * gs_alloc_ports
2170 *
2171 * Allocate all ports and set the gs_dev struct to point to them.
2172 * Return 0 if successful, or a negative error number.
2173 *
2174 * The device lock is normally held when calling this function.
2175 */
2176 static int gs_alloc_ports(struct gs_dev *dev, unsigned kmalloc_flags)
2177 {
2178 int i;
2179 struct gs_port *port;
2180
2181 if (dev == NULL)
2182 return -EIO;
2183
2184 for (i=0; i<GS_NUM_PORTS; i++) {
2185 if ((port=(struct gs_port *)kmalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
2186 return -ENOMEM;
2187
2188 memset(port, 0, sizeof(struct gs_port));
2189 port->port_dev = dev;
2190 port->port_num = i;
2191 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
2192 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
2193 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
2194 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
2195 spin_lock_init(&port->port_lock);
2196 init_waitqueue_head(&port->port_write_wait);
2197
2198 dev->dev_port[i] = port;
2199 }
2200
2201 return 0;
2202 }
2203
2204 /*
2205 * gs_free_ports
2206 *
2207 * Free all closed ports. Open ports are disconnected by
2208 * freeing their write buffers, setting their device pointers
2209 * and the pointers to them in the device to NULL. These
2210 * ports will be freed when closed.
2211 *
2212 * The device lock is normally held when calling this function.
2213 */
2214 static void gs_free_ports(struct gs_dev *dev)
2215 {
2216 int i;
2217 unsigned long flags;
2218 struct gs_port *port;
2219
2220 if (dev == NULL)
2221 return;
2222
2223 for (i=0; i<GS_NUM_PORTS; i++) {
2224 if ((port=dev->dev_port[i]) != NULL) {
2225 dev->dev_port[i] = NULL;
2226
2227 spin_lock_irqsave(&port->port_lock, flags);
2228
2229 if (port->port_write_buf != NULL) {
2230 gs_buf_free(port->port_write_buf);
2231 port->port_write_buf = NULL;
2232 }
2233
2234 if (port->port_open_count > 0 || port->port_in_use) {
2235 port->port_dev = NULL;
2236 wake_up_interruptible(&port->port_write_wait);
2237 if (port->port_tty) {
2238 wake_up_interruptible(&port->port_tty->read_wait);
2239 wake_up_interruptible(&port->port_tty->write_wait);
2240 }
2241 spin_unlock_irqrestore(&port->port_lock, flags);
2242 } else {
2243 spin_unlock_irqrestore(&port->port_lock, flags);
2244 kfree(port);
2245 }
2246
2247 }
2248 }
2249 }
2250
2251 /* Circular Buffer */
2252
2253 /*
2254 * gs_buf_alloc
2255 *
2256 * Allocate a circular buffer and all associated memory.
2257 */
2258 static struct gs_buf *gs_buf_alloc(unsigned int size, unsigned kmalloc_flags)
2259 {
2260 struct gs_buf *gb;
2261
2262 if (size == 0)
2263 return NULL;
2264
2265 gb = (struct gs_buf *)kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2266 if (gb == NULL)
2267 return NULL;
2268
2269 gb->buf_buf = kmalloc(size, kmalloc_flags);
2270 if (gb->buf_buf == NULL) {
2271 kfree(gb);
2272 return NULL;
2273 }
2274
2275 gb->buf_size = size;
2276 gb->buf_get = gb->buf_put = gb->buf_buf;
2277
2278 return gb;
2279 }
2280
2281 /*
2282 * gs_buf_free
2283 *
2284 * Free the buffer and all associated memory.
2285 */
2286 void gs_buf_free(struct gs_buf *gb)
2287 {
2288 if (gb) {
2289 kfree(gb->buf_buf);
2290 kfree(gb);
2291 }
2292 }
2293
2294 /*
2295 * gs_buf_clear
2296 *
2297 * Clear out all data in the circular buffer.
2298 */
2299 void gs_buf_clear(struct gs_buf *gb)
2300 {
2301 if (gb != NULL)
2302 gb->buf_get = gb->buf_put;
2303 /* equivalent to a get of all data available */
2304 }
2305
2306 /*
2307 * gs_buf_data_avail
2308 *
2309 * Return the number of bytes of data available in the circular
2310 * buffer.
2311 */
2312 unsigned int gs_buf_data_avail(struct gs_buf *gb)
2313 {
2314 if (gb != NULL)
2315 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2316 else
2317 return 0;
2318 }
2319
2320 /*
2321 * gs_buf_space_avail
2322 *
2323 * Return the number of bytes of space available in the circular
2324 * buffer.
2325 */
2326 unsigned int gs_buf_space_avail(struct gs_buf *gb)
2327 {
2328 if (gb != NULL)
2329 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2330 else
2331 return 0;
2332 }
2333
2334 /*
2335 * gs_buf_put
2336 *
2337 * Copy data data from a user buffer and put it into the circular buffer.
2338 * Restrict to the amount of space available.
2339 *
2340 * Return the number of bytes copied.
2341 */
2342 unsigned int gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2343 {
2344 unsigned int len;
2345
2346 if (gb == NULL)
2347 return 0;
2348
2349 len = gs_buf_space_avail(gb);
2350 if (count > len)
2351 count = len;
2352
2353 if (count == 0)
2354 return 0;
2355
2356 len = gb->buf_buf + gb->buf_size - gb->buf_put;
2357 if (count > len) {
2358 memcpy(gb->buf_put, buf, len);
2359 memcpy(gb->buf_buf, buf+len, count - len);
2360 gb->buf_put = gb->buf_buf + count - len;
2361 } else {
2362 memcpy(gb->buf_put, buf, count);
2363 if (count < len)
2364 gb->buf_put += count;
2365 else /* count == len */
2366 gb->buf_put = gb->buf_buf;
2367 }
2368
2369 return count;
2370 }
2371
2372 /*
2373 * gs_buf_get
2374 *
2375 * Get data from the circular buffer and copy to the given buffer.
2376 * Restrict to the amount of data available.
2377 *
2378 * Return the number of bytes copied.
2379 */
2380 unsigned int gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2381 {
2382 unsigned int len;
2383
2384 if (gb == NULL)
2385 return 0;
2386
2387 len = gs_buf_data_avail(gb);
2388 if (count > len)
2389 count = len;
2390
2391 if (count == 0)
2392 return 0;
2393
2394 len = gb->buf_buf + gb->buf_size - gb->buf_get;
2395 if (count > len) {
2396 memcpy(buf, gb->buf_get, len);
2397 memcpy(buf+len, gb->buf_buf, count - len);
2398 gb->buf_get = gb->buf_buf + count - len;
2399 } else {
2400 memcpy(buf, gb->buf_get, count);
2401 if (count < len)
2402 gb->buf_get += count;
2403 else /* count == len */
2404 gb->buf_get = gb->buf_buf;
2405 }
2406
2407 return count;
2408 }
ubuntu-zesty-kernel mirror