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[net-next-2.6.git] / drivers / usb / gadget / serial.c
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1da177e4
LT		 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) \
57do { \
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) \
90do { \
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
175static 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
206struct gs_dev;
207
208/* circular buffer */
209struct 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 */
217struct 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 */
223struct 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 */
236struct 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 /* desciptor 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 */
259static int __init gs_module_init(void);
260static void __exit gs_module_exit(void);
261
262/* tty driver */
263static int gs_open(struct tty_struct *tty, struct file *file);
264static void gs_close(struct tty_struct *tty, struct file *file);
265static int gs_write(struct tty_struct *tty,
266 const unsigned char *buf, int count);
267static void gs_put_char(struct tty_struct *tty, unsigned char ch);
268static void gs_flush_chars(struct tty_struct *tty);
269static int gs_write_room(struct tty_struct *tty);
270static int gs_chars_in_buffer(struct tty_struct *tty);
271static void gs_throttle(struct tty_struct * tty);
272static void gs_unthrottle(struct tty_struct * tty);
273static void gs_break(struct tty_struct *tty, int break_state);
274static int gs_ioctl(struct tty_struct *tty, struct file *file,
275 unsigned int cmd, unsigned long arg);
276static void gs_set_termios(struct tty_struct *tty, struct termios *old);
277
278static int gs_send(struct gs_dev *dev);
279static int gs_send_packet(struct gs_dev *dev, char *packet,
280 unsigned int size);
281static int gs_recv_packet(struct gs_dev *dev, char *packet,
282 unsigned int size);
283static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
284static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
285
286/* gadget driver */
287static int gs_bind(struct usb_gadget *gadget);
288static void gs_unbind(struct usb_gadget *gadget);
289static int gs_setup(struct usb_gadget *gadget,
290 const struct usb_ctrlrequest *ctrl);
291static int gs_setup_standard(struct usb_gadget *gadget,
292 const struct usb_ctrlrequest *ctrl);
293static int gs_setup_class(struct usb_gadget *gadget,
294 const struct usb_ctrlrequest *ctrl);
295static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
296static void gs_disconnect(struct usb_gadget *gadget);
297static int gs_set_config(struct gs_dev *dev, unsigned config);
298static void gs_reset_config(struct gs_dev *dev);
299static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
300 u8 type, unsigned int index, int is_otg);
301
302static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
303 int kmalloc_flags);
304static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
305
306static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
307 int kmalloc_flags);
308static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
309
310static int gs_alloc_ports(struct gs_dev *dev, int kmalloc_flags);
311static void gs_free_ports(struct gs_dev *dev);
312
313/* circular buffer */
314static struct gs_buf *gs_buf_alloc(unsigned int size, int kmalloc_flags);
315static void gs_buf_free(struct gs_buf *gb);
316static void gs_buf_clear(struct gs_buf *gb);
317static unsigned int gs_buf_data_avail(struct gs_buf *gb);
318static unsigned int gs_buf_space_avail(struct gs_buf *gb);
319static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
320 unsigned int count);
321static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
322 unsigned int count);
323
324/* external functions */
325extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
326
327
328/* Globals */
329
330static struct gs_dev *gs_device;
331
332static const char *EP_IN_NAME;
333static const char *EP_OUT_NAME;
334static const char *EP_NOTIFY_NAME;
335
336static struct semaphore gs_open_close_sem[GS_NUM_PORTS];
337
338static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
339static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
340
341static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
342
343static unsigned int use_acm = GS_DEFAULT_USE_ACM;
344
345
346/* tty driver struct */
347static 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};
361static struct tty_driver *gs_tty_driver;
362
363/* gadget driver struct */
364static 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 */
395static char manufacturer[50];
396static 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
407static struct usb_gadget_strings gs_string_table = {
408 .language = 0x0409, /* en-us */
409 .strings = gs_strings,
410};
411
412static 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
426static 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
432static 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
443static 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
454static 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
465static 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
476static 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
487static 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
494static 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
502static 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
509static 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
517static 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
526static 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
533static 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
540static 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
548static 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
563static 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
572static 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
579static 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
586static 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
594static 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
602static 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 */
620MODULE_DESCRIPTION(GS_LONG_NAME);
621MODULE_AUTHOR("Al Borchers");
622MODULE_LICENSE("GPL");
623
624#ifdef GS_DEBUG
625module_param(debug, int, S_IRUGO|S_IWUSR);
626MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
627#endif
628
629module_param(read_q_size, uint, S_IRUGO);
630MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
631
632module_param(write_q_size, uint, S_IRUGO);
633MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
634
635module_param(write_buf_size, uint, S_IRUGO);
636MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
637
638module_param(use_acm, uint, S_IRUGO);
639MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
640
641module_init(gs_module_init);
642module_exit(gs_module_exit);
643
644/*
645* gs_module_init
646*
647* Register as a USB gadget driver and a tty driver.
648*/
649static 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*/
696static 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 */
710static 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
834exit_unlock_port:
835 spin_unlock_irqrestore(&port->port_lock, flags);
836 up(sem);
837 return ret;
838
839exit_unlock_dev:
840 spin_unlock_irqrestore(&dev->dev_lock, flags);
841 up(sem);
842 return ret;
843
844}
845
846/*
847 * gs_close
848 */
849static 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
915exit:
916 spin_unlock_irqrestore(&port->port_lock, flags);
917 up(sem);
918}
919
920/*
921 * gs_write
922 */
923static 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
967exit:
968 spin_unlock_irqrestore(&port->port_lock, flags);
969 return ret;
970}
971
972/*
973 * gs_put_char
974 */
975static 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
1003exit:
1004 spin_unlock_irqrestore(&port->port_lock, flags);
1005}
1006
1007/*
1008 * gs_flush_chars
1009 */
1010static 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
1043exit:
1044 spin_unlock_irqrestore(&port->port_lock, flags);
1045}
1046
1047/*
1048 * gs_write_room
1049 */
1050static 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 */
1078static 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 */
1104static void gs_throttle(struct tty_struct *tty)
1105{
1106}
1107
1108/*
1109 * gs_unthrottle
1110 */
1111static void gs_unthrottle(struct tty_struct *tty)
1112{
1113}
1114
1115/*
1116 * gs_break
1117 */
1118static void gs_break(struct tty_struct *tty, int break_state)
1119{
1120}
1121
1122/*
1123 * gs_ioctl
1124 */
1125static 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 */
1146static 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*/
1159static 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) {
1186gs_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 */
1220static 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
1249exit:
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 */
1267static 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
1319exit:
1320 spin_unlock(&port->port_lock);
1321 return ret;
1322}
1323
1324/*
1325* gs_read_complete
1326*/
1327static 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);
1341requeue:
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*/
1369static 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 */
1382requeue:
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 */
1420static int gs_bind(struct usb_gadget *gadget)
1421{
1422 int ret;
1423 struct usb_ep *ep;
1424 struct gs_dev *dev;
1425
1426 /* device specific */
1427 if (gadget_is_net2280(gadget)) {
1428 gs_device_desc.bcdDevice =
1429 __constant_cpu_to_le16(GS_VERSION_NUM|0x0001);
1430 } else if (gadget_is_pxa(gadget)) {
1431 gs_device_desc.bcdDevice =
1432 __constant_cpu_to_le16(GS_VERSION_NUM|0x0002);
1433 } else if (gadget_is_sh(gadget)) {
1434 gs_device_desc.bcdDevice =
1435 __constant_cpu_to_le16(GS_VERSION_NUM|0x0003);
1436 /* sh doesn't support multiple interfaces or configs */
1437 use_acm = 0;
1438 } else if (gadget_is_sa1100(gadget)) {
1439 gs_device_desc.bcdDevice =
1440 __constant_cpu_to_le16(GS_VERSION_NUM|0x0004);
1441 /* sa1100 doesn't support necessary endpoints */
1442 use_acm = 0;
1443 } else if (gadget_is_goku(gadget)) {
1444 gs_device_desc.bcdDevice =
1445 __constant_cpu_to_le16(GS_VERSION_NUM|0x0005);
1446 } else if (gadget_is_mq11xx(gadget)) {
1447 gs_device_desc.bcdDevice =
1448 __constant_cpu_to_le16(GS_VERSION_NUM|0x0006);
1449 } else if (gadget_is_omap(gadget)) {
1450 gs_device_desc.bcdDevice =
1451 __constant_cpu_to_le16(GS_VERSION_NUM|0x0007);
1452 } else if (gadget_is_lh7a40x(gadget)) {
1453 gs_device_desc.bcdDevice =
1454 __constant_cpu_to_le16(GS_VERSION_NUM|0x0008);
1455 } else if (gadget_is_n9604(gadget)) {
1456 gs_device_desc.bcdDevice =
1457 __constant_cpu_to_le16(GS_VERSION_NUM|0x0009);
1458 } else if (gadget_is_pxa27x(gadget)) {
1459 gs_device_desc.bcdDevice =
1460 __constant_cpu_to_le16(GS_VERSION_NUM|0x0011);
1461 } else if (gadget_is_s3c2410(gadget)) {
1462 gs_device_desc.bcdDevice =
1463 __constant_cpu_to_le16(GS_VERSION_NUM|0x0012);
1464 } else if (gadget_is_at91(gadget)) {
1465 gs_device_desc.bcdDevice =
1466 __constant_cpu_to_le16(GS_VERSION_NUM|0x0013);
1467 } else {
1468 printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
1469 gadget->name);
1470 /* unrecognized, but safe unless bulk is REALLY quirky */
1471 gs_device_desc.bcdDevice =
1472 __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
1473 }
1474
1475 usb_ep_autoconfig_reset(gadget);
1476
1477 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1478 if (!ep)
1479 goto autoconf_fail;
1480 EP_IN_NAME = ep->name;
1481 ep->driver_data = ep; /* claim the endpoint */
1482
1483 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1484 if (!ep)
1485 goto autoconf_fail;
1486 EP_OUT_NAME = ep->name;
1487 ep->driver_data = ep; /* claim the endpoint */
1488
1489 if (use_acm) {
1490 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
1491 if (!ep) {
1492 printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
1493 goto autoconf_fail;
1494 }
1495 gs_device_desc.idProduct = __constant_cpu_to_le16(
1496 GS_CDC_PRODUCT_ID),
1497 EP_NOTIFY_NAME = ep->name;
1498 ep->driver_data = ep; /* claim the endpoint */
1499 }
1500
1501 gs_device_desc.bDeviceClass = use_acm
1502 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1503 gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1504
1505#ifdef CONFIG_USB_GADGET_DUALSPEED
1506 gs_qualifier_desc.bDeviceClass = use_acm
1507 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1508 /* assume ep0 uses the same packet size for both speeds */
1509 gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
1510 /* assume endpoints are dual-speed */
1511 gs_highspeed_notify_desc.bEndpointAddress =
1512 gs_fullspeed_notify_desc.bEndpointAddress;
1513 gs_highspeed_in_desc.bEndpointAddress =
1514 gs_fullspeed_in_desc.bEndpointAddress;
1515 gs_highspeed_out_desc.bEndpointAddress =
1516 gs_fullspeed_out_desc.bEndpointAddress;
1517#endif /* CONFIG_USB_GADGET_DUALSPEED */
1518
1519 usb_gadget_set_selfpowered(gadget);
1520
1521 if (gadget->is_otg) {
1522 gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
1523 gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1524 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1525 }
1526
1527 gs_device = dev = kmalloc(sizeof(struct gs_dev), GFP_KERNEL);
1528 if (dev == NULL)
1529 return -ENOMEM;
1530
1531 snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1532 system_utsname.sysname, system_utsname.release,
1533 gadget->name);
1534
1535 memset(dev, 0, sizeof(struct gs_dev));
1536 dev->dev_gadget = gadget;
1537 spin_lock_init(&dev->dev_lock);
1538 INIT_LIST_HEAD(&dev->dev_req_list);
1539 set_gadget_data(gadget, dev);
1540
1541 if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1542 printk(KERN_ERR "gs_bind: cannot allocate ports\n");
1543 gs_unbind(gadget);
1544 return ret;
1545 }
1546
1547 /* preallocate control response and buffer */
1548 dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1549 GFP_KERNEL);
1550 if (dev->dev_ctrl_req == NULL) {
1551 gs_unbind(gadget);
1552 return -ENOMEM;
1553 }
1554 dev->dev_ctrl_req->complete = gs_setup_complete;
1555
1556 gadget->ep0->driver_data = dev;
1557
1558 printk(KERN_INFO "gs_bind: %s %s bound\n",
1559 GS_LONG_NAME, GS_VERSION_STR);
1560
1561 return 0;
1562
1563autoconf_fail:
1564 printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
1565 return -ENODEV;
1566}
1567
1568/*
1569 * gs_unbind
1570 *
1571 * Called on module unload. Frees the control request and device
1572 * structure.
1573 */
1574static void gs_unbind(struct usb_gadget *gadget)
1575{
1576 struct gs_dev *dev = get_gadget_data(gadget);
1577
1578 gs_device = NULL;
1579
1580 /* read/write requests already freed, only control request remains */
1581 if (dev != NULL) {
1582 if (dev->dev_ctrl_req != NULL) {
1583 gs_free_req(gadget->ep0, dev->dev_ctrl_req);
1584 dev->dev_ctrl_req = NULL;
1585 }
1586 gs_free_ports(dev);
1587 kfree(dev);
1588 set_gadget_data(gadget, NULL);
1589 }
1590
1591 printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
1592 GS_VERSION_STR);
1593}
1594
1595/*
1596 * gs_setup
1597 *
1598 * Implements all the control endpoint functionality that's not
1599 * handled in hardware or the hardware driver.
1600 *
1601 * Returns the size of the data sent to the host, or a negative
1602 * error number.
1603 */
1604static int gs_setup(struct usb_gadget *gadget,
1605 const struct usb_ctrlrequest *ctrl)
1606{
1607 int ret = -EOPNOTSUPP;
1608 struct gs_dev *dev = get_gadget_data(gadget);
1609 struct usb_request *req = dev->dev_ctrl_req;
1610 u16 wIndex = ctrl->wIndex;
1611 u16 wValue = ctrl->wValue;
1612 u16 wLength = ctrl->wLength;
1613
1614 switch (ctrl->bRequestType & USB_TYPE_MASK) {
1615 case USB_TYPE_STANDARD:
1616 ret = gs_setup_standard(gadget,ctrl);
1617 break;
1618
1619 case USB_TYPE_CLASS:
1620 ret = gs_setup_class(gadget,ctrl);
1621 break;
1622
1623 default:
1624 printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1625 ctrl->bRequestType, ctrl->bRequest,
1626 wValue, wIndex, wLength);
1627 break;
1628 }
1629
1630 /* respond with data transfer before status phase? */
1631 if (ret >= 0) {
1632 req->length = ret;
1633 req->zero = ret < wLength
1634 && (ret % gadget->ep0->maxpacket) == 0;
1635 ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1636 if (ret < 0) {
1637 printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
1638 ret);
1639 req->status = 0;
1640 gs_setup_complete(gadget->ep0, req);
1641 }
1642 }
1643
1644 /* device either stalls (ret < 0) or reports success */
1645 return ret;
1646}
1647
1648static int gs_setup_standard(struct usb_gadget *gadget,
1649 const struct usb_ctrlrequest *ctrl)
1650{
1651 int ret = -EOPNOTSUPP;
1652 struct gs_dev *dev = get_gadget_data(gadget);
1653 struct usb_request *req = dev->dev_ctrl_req;
1654 u16 wIndex = ctrl->wIndex;
1655 u16 wValue = ctrl->wValue;
1656 u16 wLength = ctrl->wLength;
1657
1658 switch (ctrl->bRequest) {
1659 case USB_REQ_GET_DESCRIPTOR:
1660 if (ctrl->bRequestType != USB_DIR_IN)
1661 break;
1662
1663 switch (wValue >> 8) {
1664 case USB_DT_DEVICE:
1665 ret = min(wLength,
1666 (u16)sizeof(struct usb_device_descriptor));
1667 memcpy(req->buf, &gs_device_desc, ret);
1668 break;
1669
1670#ifdef CONFIG_USB_GADGET_DUALSPEED
1671 case USB_DT_DEVICE_QUALIFIER:
1672 if (!gadget->is_dualspeed)
1673 break;
1674 ret = min(wLength,
1675 (u16)sizeof(struct usb_qualifier_descriptor));
1676 memcpy(req->buf, &gs_qualifier_desc, ret);
1677 break;
1678
1679 case USB_DT_OTHER_SPEED_CONFIG:
1680 if (!gadget->is_dualspeed)
1681 break;
1682 /* fall through */
1683#endif /* CONFIG_USB_GADGET_DUALSPEED */
1684 case USB_DT_CONFIG:
1685 ret = gs_build_config_buf(req->buf, gadget->speed,
1686 wValue >> 8, wValue & 0xff,
1687 gadget->is_otg);
1688 if (ret >= 0)
1689 ret = min(wLength, (u16)ret);
1690 break;
1691
1692 case USB_DT_STRING:
1693 /* wIndex == language code. */
1694 ret = usb_gadget_get_string(&gs_string_table,
1695 wValue & 0xff, req->buf);
1696 if (ret >= 0)
1697 ret = min(wLength, (u16)ret);
1698 break;
1699 }
1700 break;
1701
1702 case USB_REQ_SET_CONFIGURATION:
1703 if (ctrl->bRequestType != 0)
1704 break;
1705 spin_lock(&dev->dev_lock);
1706 ret = gs_set_config(dev, wValue);
1707 spin_unlock(&dev->dev_lock);
1708 break;
1709
1710 case USB_REQ_GET_CONFIGURATION:
1711 if (ctrl->bRequestType != USB_DIR_IN)
1712 break;
1713 *(u8 *)req->buf = dev->dev_config;
1714 ret = min(wLength, (u16)1);
1715 break;
1716
1717 case USB_REQ_SET_INTERFACE:
1718 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1719 || !dev->dev_config
1720 || wIndex >= GS_MAX_NUM_INTERFACES)
1721 break;
1722 if (dev->dev_config == GS_BULK_CONFIG_ID
1723 && wIndex != GS_BULK_INTERFACE_ID)
1724 break;
1725 /* no alternate interface settings */
1726 if (wValue != 0)
1727 break;
1728 spin_lock(&dev->dev_lock);
1729 /* PXA hardware partially handles SET_INTERFACE;
1730 * we need to kluge around that interference. */
1731 if (gadget_is_pxa(gadget)) {
1732 ret = gs_set_config(dev, use_acm ?
1733 GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
1734 goto set_interface_done;
1735 }
1736 if (dev->dev_config != GS_BULK_CONFIG_ID
1737 && wIndex == GS_CONTROL_INTERFACE_ID) {
1738 if (dev->dev_notify_ep) {
1739 usb_ep_disable(dev->dev_notify_ep);
1740 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
1741 }
1742 } else {
1743 usb_ep_disable(dev->dev_in_ep);
1744 usb_ep_disable(dev->dev_out_ep);
1745 usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1746 usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1747 }
1748 ret = 0;
1749set_interface_done:
1750 spin_unlock(&dev->dev_lock);
1751 break;
1752
1753 case USB_REQ_GET_INTERFACE:
1754 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1755 || dev->dev_config == GS_NO_CONFIG_ID)
1756 break;
1757 if (wIndex >= GS_MAX_NUM_INTERFACES
1758 || (dev->dev_config == GS_BULK_CONFIG_ID
1759 && wIndex != GS_BULK_INTERFACE_ID)) {
1760 ret = -EDOM;
1761 break;
1762 }
1763 /* no alternate interface settings */
1764 *(u8 *)req->buf = 0;
1765 ret = min(wLength, (u16)1);
1766 break;
1767
1768 default:
1769 printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1770 ctrl->bRequestType, ctrl->bRequest,
1771 wValue, wIndex, wLength);
1772 break;
1773 }
1774
1775 return ret;
1776}
1777
1778static int gs_setup_class(struct usb_gadget *gadget,
1779 const struct usb_ctrlrequest *ctrl)
1780{
1781 int ret = -EOPNOTSUPP;
1782 struct gs_dev *dev = get_gadget_data(gadget);
1783 struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
1784 struct usb_request *req = dev->dev_ctrl_req;
1785 u16 wIndex = ctrl->wIndex;
1786 u16 wValue = ctrl->wValue;
1787 u16 wLength = ctrl->wLength;
1788
1789 switch (ctrl->bRequest) {
1790 case USB_CDC_REQ_SET_LINE_CODING:
1791 ret = min(wLength,
1792 (u16)sizeof(struct usb_cdc_line_coding));
1793 if (port) {
1794 spin_lock(&port->port_lock);
1795 memcpy(&port->port_line_coding, req->buf, ret);
1796 spin_unlock(&port->port_lock);
1797 }
1798 break;
1799
1800 case USB_CDC_REQ_GET_LINE_CODING:
1801 port = dev->dev_port[0]; /* ACM only has one port */
1802 ret = min(wLength,
1803 (u16)sizeof(struct usb_cdc_line_coding));
1804 if (port) {
1805 spin_lock(&port->port_lock);
1806 memcpy(req->buf, &port->port_line_coding, ret);
1807 spin_unlock(&port->port_lock);
1808 }
1809 break;
1810
1811 case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1812 ret = 0;
1813 break;
1814
1815 default:
1816 printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1817 ctrl->bRequestType, ctrl->bRequest,
1818 wValue, wIndex, wLength);
1819 break;
1820 }
1821
1822 return ret;
1823}
1824
1825/*
1826 * gs_setup_complete
1827 */
1828static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
1829{
1830 if (req->status || req->actual != req->length) {
1831 printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
1832 req->status, req->actual, req->length);
1833 }
1834}
1835
1836/*
1837 * gs_disconnect
1838 *
1839 * Called when the device is disconnected. Frees the closed
1840 * ports and disconnects open ports. Open ports will be freed
1841 * on close. Then reallocates the ports for the next connection.
1842 */
1843static void gs_disconnect(struct usb_gadget *gadget)
1844{
1845 unsigned long flags;
1846 struct gs_dev *dev = get_gadget_data(gadget);
1847
1848 spin_lock_irqsave(&dev->dev_lock, flags);
1849
1850 gs_reset_config(dev);
1851
1852 /* free closed ports and disconnect open ports */
1853 /* (open ports will be freed when closed) */
1854 gs_free_ports(dev);
1855
1856 /* re-allocate ports for the next connection */
1857 if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1858 printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
1859
1860 spin_unlock_irqrestore(&dev->dev_lock, flags);
1861
1862 printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
1863}
1864
1865/*
1866 * gs_set_config
1867 *
1868 * Configures the device by enabling device specific
1869 * optimizations, setting up the endpoints, allocating
1870 * read and write requests and queuing read requests.
1871 *
1872 * The device lock must be held when calling this function.
1873 */
1874static int gs_set_config(struct gs_dev *dev, unsigned config)
1875{
1876 int i;
1877 int ret = 0;
1878 struct usb_gadget *gadget = dev->dev_gadget;
1879 struct usb_ep *ep;
1880 struct usb_endpoint_descriptor *ep_desc;
1881 struct usb_request *req;
1882 struct gs_req_entry *req_entry;
1883
1884 if (dev == NULL) {
1885 printk(KERN_ERR "gs_set_config: NULL device pointer\n");
1886 return 0;
1887 }
1888
1889 if (config == dev->dev_config)
1890 return 0;
1891
1892 gs_reset_config(dev);
1893
1894 switch (config) {
1895 case GS_NO_CONFIG_ID:
1896 return 0;
1897 case GS_BULK_CONFIG_ID:
1898 if (use_acm)
1899 return -EINVAL;
1900 /* device specific optimizations */
1901 if (gadget_is_net2280(gadget))
1902 net2280_set_fifo_mode(gadget, 1);
1903 break;
1904 case GS_ACM_CONFIG_ID:
1905 if (!use_acm)
1906 return -EINVAL;
1907 /* device specific optimizations */
1908 if (gadget_is_net2280(gadget))
1909 net2280_set_fifo_mode(gadget, 1);
1910 break;
1911 default:
1912 return -EINVAL;
1913 }
1914
1915 dev->dev_config = config;
1916
1917 gadget_for_each_ep(ep, gadget) {
1918
1919 if (EP_NOTIFY_NAME
1920 && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
1921 ep_desc = GS_SPEED_SELECT(
1922 gadget->speed == USB_SPEED_HIGH,
1923 &gs_highspeed_notify_desc,
1924 &gs_fullspeed_notify_desc);
1925 ret = usb_ep_enable(ep,ep_desc);
1926 if (ret == 0) {
1927 ep->driver_data = dev;
1928 dev->dev_notify_ep = ep;
1929 dev->dev_notify_ep_desc = ep_desc;
1930 } else {
1931 printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
1932 ep->name, ret);
1933 goto exit_reset_config;
1934 }
1935 }
1936
1937 else if (strcmp(ep->name, EP_IN_NAME) == 0) {
1938 ep_desc = GS_SPEED_SELECT(
1939 gadget->speed == USB_SPEED_HIGH,
1940 &gs_highspeed_in_desc,
1941 &gs_fullspeed_in_desc);
1942 ret = usb_ep_enable(ep,ep_desc);
1943 if (ret == 0) {
1944 ep->driver_data = dev;
1945 dev->dev_in_ep = ep;
1946 dev->dev_in_ep_desc = ep_desc;
1947 } else {
1948 printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
1949 ep->name, ret);
1950 goto exit_reset_config;
1951 }
1952 }
1953
1954 else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
1955 ep_desc = GS_SPEED_SELECT(
1956 gadget->speed == USB_SPEED_HIGH,
1957 &gs_highspeed_out_desc,
1958 &gs_fullspeed_out_desc);
1959 ret = usb_ep_enable(ep,ep_desc);
1960 if (ret == 0) {
1961 ep->driver_data = dev;
1962 dev->dev_out_ep = ep;
1963 dev->dev_out_ep_desc = ep_desc;
1964 } else {
1965 printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
1966 ep->name, ret);
1967 goto exit_reset_config;
1968 }
1969 }
1970
1971 }
1972
1973 if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
1974 || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
1975 printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
1976 ret = -ENODEV;
1977 goto exit_reset_config;
1978 }
1979
1980 /* allocate and queue read requests */
1981 ep = dev->dev_out_ep;
1982 for (i=0; i<read_q_size && ret == 0; i++) {
1983 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1984 req->complete = gs_read_complete;
1985 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1986 printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
1987 ret);
1988 }
1989 } else {
1990 printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
1991 ret = -ENOMEM;
1992 goto exit_reset_config;
1993 }
1994 }
1995
1996 /* allocate write requests, and put on free list */
1997 ep = dev->dev_in_ep;
1998 for (i=0; i<write_q_size; i++) {
1999 if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
2000 req_entry->re_req->complete = gs_write_complete;
2001 list_add(&req_entry->re_entry, &dev->dev_req_list);
2002 } else {
2003 printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
2004 ret = -ENOMEM;
2005 goto exit_reset_config;
2006 }
2007 }
2008
2009 printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
2010 GS_LONG_NAME,
2011 gadget->speed == USB_SPEED_HIGH ? "high" : "full",
2012 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
2013
2014 return 0;
2015
2016exit_reset_config:
2017 gs_reset_config(dev);
2018 return ret;
2019}
2020
2021/*
2022 * gs_reset_config
2023 *
2024 * Mark the device as not configured, disable all endpoints,
2025 * which forces completion of pending I/O and frees queued
2026 * requests, and free the remaining write requests on the
2027 * free list.
2028 *
2029 * The device lock must be held when calling this function.
2030 */
2031static void gs_reset_config(struct gs_dev *dev)
2032{
2033 struct gs_req_entry *req_entry;
2034
2035 if (dev == NULL) {
2036 printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
2037 return;
2038 }
2039
2040 if (dev->dev_config == GS_NO_CONFIG_ID)
2041 return;
2042
2043 dev->dev_config = GS_NO_CONFIG_ID;
2044
2045 /* free write requests on the free list */
2046 while(!list_empty(&dev->dev_req_list)) {
2047 req_entry = list_entry(dev->dev_req_list.next,
2048 struct gs_req_entry, re_entry);
2049 list_del(&req_entry->re_entry);
2050 gs_free_req_entry(dev->dev_in_ep, req_entry);
2051 }
2052
2053 /* disable endpoints, forcing completion of pending i/o; */
2054 /* completion handlers free their requests in this case */
2055 if (dev->dev_notify_ep) {
2056 usb_ep_disable(dev->dev_notify_ep);
2057 dev->dev_notify_ep = NULL;
2058 }
2059 if (dev->dev_in_ep) {
2060 usb_ep_disable(dev->dev_in_ep);
2061 dev->dev_in_ep = NULL;
2062 }
2063 if (dev->dev_out_ep) {
2064 usb_ep_disable(dev->dev_out_ep);
2065 dev->dev_out_ep = NULL;
2066 }
2067}
2068
2069/*
2070 * gs_build_config_buf
2071 *
2072 * Builds the config descriptors in the given buffer and returns the
2073 * length, or a negative error number.
2074 */
2075static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
2076 u8 type, unsigned int index, int is_otg)
2077{
2078 int len;
2079 int high_speed;
2080 const struct usb_config_descriptor *config_desc;
2081 const struct usb_descriptor_header **function;
2082
2083 if (index >= gs_device_desc.bNumConfigurations)
2084 return -EINVAL;
2085
2086 /* other speed switches high and full speed */
2087 high_speed = (speed == USB_SPEED_HIGH);
2088 if (type == USB_DT_OTHER_SPEED_CONFIG)
2089 high_speed = !high_speed;
2090
2091 if (use_acm) {
2092 config_desc = &gs_acm_config_desc;
2093 function = GS_SPEED_SELECT(high_speed,
2094 gs_acm_highspeed_function,
2095 gs_acm_fullspeed_function);
2096 } else {
2097 config_desc = &gs_bulk_config_desc;
2098 function = GS_SPEED_SELECT(high_speed,
2099 gs_bulk_highspeed_function,
2100 gs_bulk_fullspeed_function);
2101 }
2102
2103 /* for now, don't advertise srp-only devices */
2104 if (!is_otg)
2105 function++;
2106
2107 len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
2108 if (len < 0)
2109 return len;
2110
2111 ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
2112
2113 return len;
2114}
2115
2116/*
2117 * gs_alloc_req
2118 *
2119 * Allocate a usb_request and its buffer. Returns a pointer to the
2120 * usb_request or NULL if there is an error.
2121 */
2122static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len, int kmalloc_flags)
2123{
2124 struct usb_request *req;
2125
2126 if (ep == NULL)
2127 return NULL;
2128
2129 req = usb_ep_alloc_request(ep, kmalloc_flags);
2130
2131 if (req != NULL) {
2132 req->length = len;
2133 req->buf = kmalloc(len, kmalloc_flags);
2134 if (req->buf == NULL) {
2135 usb_ep_free_request(ep, req);
2136 return NULL;
2137 }
2138 }
2139
2140 return req;
2141}
2142
2143/*
2144 * gs_free_req
2145 *
2146 * Free a usb_request and its buffer.
2147 */
2148static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
2149{
2150 if (ep != NULL && req != NULL) {
2151 kfree(req->buf);
2152 usb_ep_free_request(ep, req);
2153 }
2154}
2155
2156/*
2157 * gs_alloc_req_entry
2158 *
2159 * Allocates a request and its buffer, using the given
2160 * endpoint, buffer len, and kmalloc flags.
2161 */
2162static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len, int kmalloc_flags)
2163{
2164 struct gs_req_entry *req;
2165
2166 req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
2167 if (req == NULL)
2168 return NULL;
2169
2170 req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
2171 if (req->re_req == NULL) {
2172 kfree(req);
2173 return NULL;
2174 }
2175
2176 req->re_req->context = req;
2177
2178 return req;
2179}
2180
2181/*
2182 * gs_free_req_entry
2183 *
2184 * Frees a request and its buffer.
2185 */
2186static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
2187{
2188 if (ep != NULL && req != NULL) {
2189 if (req->re_req != NULL)
2190 gs_free_req(ep, req->re_req);
2191 kfree(req);
2192 }
2193}
2194
2195/*
2196 * gs_alloc_ports
2197 *
2198 * Allocate all ports and set the gs_dev struct to point to them.
2199 * Return 0 if successful, or a negative error number.
2200 *
2201 * The device lock is normally held when calling this function.
2202 */
2203static int gs_alloc_ports(struct gs_dev *dev, int kmalloc_flags)
2204{
2205 int i;
2206 struct gs_port *port;
2207
2208 if (dev == NULL)
2209 return -EIO;
2210
2211 for (i=0; i<GS_NUM_PORTS; i++) {
2212 if ((port=(struct gs_port *)kmalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
2213 return -ENOMEM;
2214
2215 memset(port, 0, sizeof(struct gs_port));
2216 port->port_dev = dev;
2217 port->port_num = i;
2218 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
2219 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
2220 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
2221 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
2222 spin_lock_init(&port->port_lock);
2223 init_waitqueue_head(&port->port_write_wait);
2224
2225 dev->dev_port[i] = port;
2226 }
2227
2228 return 0;
2229}
2230
2231/*
2232 * gs_free_ports
2233 *
2234 * Free all closed ports. Open ports are disconnected by
2235 * freeing their write buffers, setting their device pointers
2236 * and the pointers to them in the device to NULL. These
2237 * ports will be freed when closed.
2238 *
2239 * The device lock is normally held when calling this function.
2240 */
2241static void gs_free_ports(struct gs_dev *dev)
2242{
2243 int i;
2244 unsigned long flags;
2245 struct gs_port *port;
2246
2247 if (dev == NULL)
2248 return;
2249
2250 for (i=0; i<GS_NUM_PORTS; i++) {
2251 if ((port=dev->dev_port[i]) != NULL) {
2252 dev->dev_port[i] = NULL;
2253
2254 spin_lock_irqsave(&port->port_lock, flags);
2255
2256 if (port->port_write_buf != NULL) {
2257 gs_buf_free(port->port_write_buf);
2258 port->port_write_buf = NULL;
2259 }
2260
2261 if (port->port_open_count > 0 || port->port_in_use) {
2262 port->port_dev = NULL;
2263 wake_up_interruptible(&port->port_write_wait);
2264 if (port->port_tty) {
2265 wake_up_interruptible(&port->port_tty->read_wait);
2266 wake_up_interruptible(&port->port_tty->write_wait);
2267 }
2268 spin_unlock_irqrestore(&port->port_lock, flags);
2269 } else {
2270 spin_unlock_irqrestore(&port->port_lock, flags);
2271 kfree(port);
2272 }
2273
2274 }
2275 }
2276}
2277
2278/* Circular Buffer */
2279
2280/*
2281 * gs_buf_alloc
2282 *
2283 * Allocate a circular buffer and all associated memory.
2284 */
2285static struct gs_buf *gs_buf_alloc(unsigned int size, int kmalloc_flags)
2286{
2287 struct gs_buf *gb;
2288
2289 if (size == 0)
2290 return NULL;
2291
2292 gb = (struct gs_buf *)kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2293 if (gb == NULL)
2294 return NULL;
2295
2296 gb->buf_buf = kmalloc(size, kmalloc_flags);
2297 if (gb->buf_buf == NULL) {
2298 kfree(gb);
2299 return NULL;
2300 }
2301
2302 gb->buf_size = size;
2303 gb->buf_get = gb->buf_put = gb->buf_buf;
2304
2305 return gb;
2306}
2307
2308/*
2309 * gs_buf_free
2310 *
2311 * Free the buffer and all associated memory.
2312 */
2313void gs_buf_free(struct gs_buf *gb)
2314{
2315 if (gb != NULL) {
2316 if (gb->buf_buf != NULL)
2317 kfree(gb->buf_buf);
2318 kfree(gb);
2319 }
2320}
2321
2322/*
2323 * gs_buf_clear
2324 *
2325 * Clear out all data in the circular buffer.
2326 */
2327void gs_buf_clear(struct gs_buf *gb)
2328{
2329 if (gb != NULL)
2330 gb->buf_get = gb->buf_put;
2331 /* equivalent to a get of all data available */
2332}
2333
2334/*
2335 * gs_buf_data_avail
2336 *
2337 * Return the number of bytes of data available in the circular
2338 * buffer.
2339 */
2340unsigned int gs_buf_data_avail(struct gs_buf *gb)
2341{
2342 if (gb != NULL)
2343 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2344 else
2345 return 0;
2346}
2347
2348/*
2349 * gs_buf_space_avail
2350 *
2351 * Return the number of bytes of space available in the circular
2352 * buffer.
2353 */
2354unsigned int gs_buf_space_avail(struct gs_buf *gb)
2355{
2356 if (gb != NULL)
2357 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2358 else
2359 return 0;
2360}
2361
2362/*
2363 * gs_buf_put
2364 *
2365 * Copy data data from a user buffer and put it into the circular buffer.
2366 * Restrict to the amount of space available.
2367 *
2368 * Return the number of bytes copied.
2369 */
2370unsigned int gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2371{
2372 unsigned int len;
2373
2374 if (gb == NULL)
2375 return 0;
2376
2377 len = gs_buf_space_avail(gb);
2378 if (count > len)
2379 count = len;
2380
2381 if (count == 0)
2382 return 0;
2383
2384 len = gb->buf_buf + gb->buf_size - gb->buf_put;
2385 if (count > len) {
2386 memcpy(gb->buf_put, buf, len);
2387 memcpy(gb->buf_buf, buf+len, count - len);
2388 gb->buf_put = gb->buf_buf + count - len;
2389 } else {
2390 memcpy(gb->buf_put, buf, count);
2391 if (count < len)
2392 gb->buf_put += count;
2393 else /* count == len */
2394 gb->buf_put = gb->buf_buf;
2395 }
2396
2397 return count;
2398}
2399
2400/*
2401 * gs_buf_get
2402 *
2403 * Get data from the circular buffer and copy to the given buffer.
2404 * Restrict to the amount of data available.
2405 *
2406 * Return the number of bytes copied.
2407 */
2408unsigned int gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2409{
2410 unsigned int len;
2411
2412 if (gb == NULL)
2413 return 0;
2414
2415 len = gs_buf_data_avail(gb);
2416 if (count > len)
2417 count = len;
2418
2419 if (count == 0)
2420 return 0;
2421
2422 len = gb->buf_buf + gb->buf_size - gb->buf_get;
2423 if (count > len) {
2424 memcpy(buf, gb->buf_get, len);
2425 memcpy(buf+len, gb->buf_buf, count - len);
2426 gb->buf_get = gb->buf_buf + count - len;
2427 } else {
2428 memcpy(buf, gb->buf_get, count);
2429 if (count < len)
2430 gb->buf_get += count;
2431 else /* count == len */
2432 gb->buf_get = gb->buf_buf;
2433 }
2434
2435 return count;
2436}
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