Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight
[linux-2.6] / 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/module.h>
21 #include <linux/kernel.h>
22 #include <linux/delay.h>
23 #include <linux/ioport.h>
24 #include <linux/slab.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/timer.h>
28 #include <linux/list.h>
29 #include <linux/interrupt.h>
30 #include <linux/utsname.h>
31 #include <linux/wait.h>
32 #include <linux/proc_fs.h>
33 #include <linux/device.h>
34 #include <linux/tty.h>
35 #include <linux/tty_flip.h>
36 #include <linux/mutex.h>
37
38 #include <asm/byteorder.h>
39 #include <asm/io.h>
40 #include <asm/irq.h>
41 #include <asm/system.h>
42 #include <asm/unaligned.h>
43 #include <asm/uaccess.h>
44
45 #include <linux/usb/ch9.h>
46 #include <linux/usb/cdc.h>
47 #include <linux/usb_gadget.h>
48
49 #include "gadget_chips.h"
50
51
52 /* Defines */
53
54 #define GS_VERSION_STR                  "v2.2"
55 #define GS_VERSION_NUM                  0x0202
56
57 #define GS_LONG_NAME                    "Gadget Serial"
58 #define GS_SHORT_NAME                   "g_serial"
59
60 #define GS_MAJOR                        127
61 #define GS_MINOR_START                  0
62
63 #define GS_NUM_PORTS                    16
64
65 #define GS_NUM_CONFIGS                  1
66 #define GS_NO_CONFIG_ID                 0
67 #define GS_BULK_CONFIG_ID               1
68 #define GS_ACM_CONFIG_ID                2
69
70 #define GS_MAX_NUM_INTERFACES           2
71 #define GS_BULK_INTERFACE_ID            0
72 #define GS_CONTROL_INTERFACE_ID         0
73 #define GS_DATA_INTERFACE_ID            1
74
75 #define GS_MAX_DESC_LEN                 256
76
77 #define GS_DEFAULT_READ_Q_SIZE          32
78 #define GS_DEFAULT_WRITE_Q_SIZE         32
79
80 #define GS_DEFAULT_WRITE_BUF_SIZE       8192
81 #define GS_TMP_BUF_SIZE                 8192
82
83 #define GS_CLOSE_TIMEOUT                15
84
85 #define GS_DEFAULT_USE_ACM              0
86
87 #define GS_DEFAULT_DTE_RATE             9600
88 #define GS_DEFAULT_DATA_BITS            8
89 #define GS_DEFAULT_PARITY               USB_CDC_NO_PARITY
90 #define GS_DEFAULT_CHAR_FORMAT          USB_CDC_1_STOP_BITS
91
92 /* select highspeed/fullspeed, hiding highspeed if not configured */
93 #ifdef CONFIG_USB_GADGET_DUALSPEED
94 #define GS_SPEED_SELECT(is_hs,hs,fs) ((is_hs) ? (hs) : (fs))
95 #else
96 #define GS_SPEED_SELECT(is_hs,hs,fs) (fs)
97 #endif /* CONFIG_USB_GADGET_DUALSPEED */
98
99 /* debug settings */
100 #ifdef GS_DEBUG
101 static int debug = 1;
102
103 #define gs_debug(format, arg...) \
104         do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
105 #define gs_debug_level(level, format, arg...) \
106         do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
107
108 #else
109
110 #define gs_debug(format, arg...) \
111         do { } while(0)
112 #define gs_debug_level(level, format, arg...) \
113         do { } while(0)
114
115 #endif /* GS_DEBUG */
116
117 /* Thanks to NetChip Technologies for donating this product ID.
118  *
119  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
120  * Instead:  allocate your own, using normal USB-IF procedures.
121  */
122 #define GS_VENDOR_ID                    0x0525  /* NetChip */
123 #define GS_PRODUCT_ID                   0xa4a6  /* Linux-USB Serial Gadget */
124 #define GS_CDC_PRODUCT_ID               0xa4a7  /* ... as CDC-ACM */
125
126 #define GS_LOG2_NOTIFY_INTERVAL         5       /* 1 << 5 == 32 msec */
127 #define GS_NOTIFY_MAXPACKET             8
128
129
130 /* Structures */
131
132 struct gs_dev;
133
134 /* circular buffer */
135 struct gs_buf {
136         unsigned int            buf_size;
137         char                    *buf_buf;
138         char                    *buf_get;
139         char                    *buf_put;
140 };
141
142 /* list of requests */
143 struct gs_req_entry {
144         struct list_head        re_entry;
145         struct usb_request      *re_req;
146 };
147
148 /* the port structure holds info for each port, one for each minor number */
149 struct gs_port {
150         struct gs_dev           *port_dev;      /* pointer to device struct */
151         struct tty_struct       *port_tty;      /* pointer to tty struct */
152         spinlock_t              port_lock;
153         int                     port_num;
154         int                     port_open_count;
155         int                     port_in_use;    /* open/close in progress */
156         wait_queue_head_t       port_write_wait;/* waiting to write */
157         struct gs_buf           *port_write_buf;
158         struct usb_cdc_line_coding      port_line_coding;
159 };
160
161 /* the device structure holds info for the USB device */
162 struct gs_dev {
163         struct usb_gadget       *dev_gadget;    /* gadget device pointer */
164         spinlock_t              dev_lock;       /* lock for set/reset config */
165         int                     dev_config;     /* configuration number */
166         struct usb_ep           *dev_notify_ep; /* address of notify endpoint */
167         struct usb_ep           *dev_in_ep;     /* address of in endpoint */
168         struct usb_ep           *dev_out_ep;    /* address of out endpoint */
169         struct usb_endpoint_descriptor          /* descriptor of notify ep */
170                                 *dev_notify_ep_desc;
171         struct usb_endpoint_descriptor          /* descriptor of in endpoint */
172                                 *dev_in_ep_desc;
173         struct usb_endpoint_descriptor          /* descriptor of out endpoint */
174                                 *dev_out_ep_desc;
175         struct usb_request      *dev_ctrl_req;  /* control request */
176         struct list_head        dev_req_list;   /* list of write requests */
177         int                     dev_sched_port; /* round robin port scheduled */
178         struct gs_port          *dev_port[GS_NUM_PORTS]; /* the ports */
179 };
180
181
182 /* Functions */
183
184 /* module */
185 static int __init gs_module_init(void);
186 static void __exit gs_module_exit(void);
187
188 /* tty driver */
189 static int gs_open(struct tty_struct *tty, struct file *file);
190 static void gs_close(struct tty_struct *tty, struct file *file);
191 static int gs_write(struct tty_struct *tty, 
192         const unsigned char *buf, int count);
193 static void gs_put_char(struct tty_struct *tty, unsigned char ch);
194 static void gs_flush_chars(struct tty_struct *tty);
195 static int gs_write_room(struct tty_struct *tty);
196 static int gs_chars_in_buffer(struct tty_struct *tty);
197 static void gs_throttle(struct tty_struct * tty);
198 static void gs_unthrottle(struct tty_struct * tty);
199 static void gs_break(struct tty_struct *tty, int break_state);
200 static int  gs_ioctl(struct tty_struct *tty, struct file *file,
201         unsigned int cmd, unsigned long arg);
202 static void gs_set_termios(struct tty_struct *tty, struct ktermios *old);
203
204 static int gs_send(struct gs_dev *dev);
205 static int gs_send_packet(struct gs_dev *dev, char *packet,
206         unsigned int size);
207 static int gs_recv_packet(struct gs_dev *dev, char *packet,
208         unsigned int size);
209 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
210 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
211
212 /* gadget driver */
213 static int gs_bind(struct usb_gadget *gadget);
214 static void gs_unbind(struct usb_gadget *gadget);
215 static int gs_setup(struct usb_gadget *gadget,
216         const struct usb_ctrlrequest *ctrl);
217 static int gs_setup_standard(struct usb_gadget *gadget,
218         const struct usb_ctrlrequest *ctrl);
219 static int gs_setup_class(struct usb_gadget *gadget,
220         const struct usb_ctrlrequest *ctrl);
221 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
222 static void gs_disconnect(struct usb_gadget *gadget);
223 static int gs_set_config(struct gs_dev *dev, unsigned config);
224 static void gs_reset_config(struct gs_dev *dev);
225 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
226                 u8 type, unsigned int index, int is_otg);
227
228 static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
229         gfp_t kmalloc_flags);
230 static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
231
232 static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
233         gfp_t kmalloc_flags);
234 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
235
236 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
237 static void gs_free_ports(struct gs_dev *dev);
238
239 /* circular buffer */
240 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
241 static void gs_buf_free(struct gs_buf *gb);
242 static void gs_buf_clear(struct gs_buf *gb);
243 static unsigned int gs_buf_data_avail(struct gs_buf *gb);
244 static unsigned int gs_buf_space_avail(struct gs_buf *gb);
245 static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
246         unsigned int count);
247 static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
248         unsigned int count);
249
250 /* external functions */
251 extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
252
253
254 /* Globals */
255
256 static struct gs_dev *gs_device;
257
258 static const char *EP_IN_NAME;
259 static const char *EP_OUT_NAME;
260 static const char *EP_NOTIFY_NAME;
261
262 static struct mutex gs_open_close_lock[GS_NUM_PORTS];
263
264 static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
265 static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
266
267 static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
268
269 static unsigned int use_acm = GS_DEFAULT_USE_ACM;
270
271
272 /* tty driver struct */
273 static const struct tty_operations gs_tty_ops = {
274         .open =                 gs_open,
275         .close =                gs_close,
276         .write =                gs_write,
277         .put_char =             gs_put_char,
278         .flush_chars =          gs_flush_chars,
279         .write_room =           gs_write_room,
280         .ioctl =                gs_ioctl,
281         .set_termios =          gs_set_termios,
282         .throttle =             gs_throttle,
283         .unthrottle =           gs_unthrottle,
284         .break_ctl =            gs_break,
285         .chars_in_buffer =      gs_chars_in_buffer,
286 };
287 static struct tty_driver *gs_tty_driver;
288
289 /* gadget driver struct */
290 static struct usb_gadget_driver gs_gadget_driver = {
291 #ifdef CONFIG_USB_GADGET_DUALSPEED
292         .speed =                USB_SPEED_HIGH,
293 #else
294         .speed =                USB_SPEED_FULL,
295 #endif /* CONFIG_USB_GADGET_DUALSPEED */
296         .function =             GS_LONG_NAME,
297         .bind =                 gs_bind,
298         .unbind =               gs_unbind,
299         .setup =                gs_setup,
300         .disconnect =           gs_disconnect,
301         .driver = {
302                 .name =         GS_SHORT_NAME,
303         },
304 };
305
306
307 /* USB descriptors */
308
309 #define GS_MANUFACTURER_STR_ID  1
310 #define GS_PRODUCT_STR_ID       2
311 #define GS_SERIAL_STR_ID        3
312 #define GS_BULK_CONFIG_STR_ID   4
313 #define GS_ACM_CONFIG_STR_ID    5
314 #define GS_CONTROL_STR_ID       6
315 #define GS_DATA_STR_ID          7
316
317 /* static strings, in UTF-8 */
318 static char manufacturer[50];
319 static struct usb_string gs_strings[] = {
320         { GS_MANUFACTURER_STR_ID, manufacturer },
321         { GS_PRODUCT_STR_ID, GS_LONG_NAME },
322         { GS_SERIAL_STR_ID, "0" },
323         { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
324         { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
325         { GS_CONTROL_STR_ID, "Gadget Serial Control" },
326         { GS_DATA_STR_ID, "Gadget Serial Data" },
327         {  } /* end of list */
328 };
329
330 static struct usb_gadget_strings gs_string_table = {
331         .language =             0x0409, /* en-us */
332         .strings =              gs_strings,
333 };
334
335 static struct usb_device_descriptor gs_device_desc = {
336         .bLength =              USB_DT_DEVICE_SIZE,
337         .bDescriptorType =      USB_DT_DEVICE,
338         .bcdUSB =               __constant_cpu_to_le16(0x0200),
339         .bDeviceSubClass =      0,
340         .bDeviceProtocol =      0,
341         .idVendor =             __constant_cpu_to_le16(GS_VENDOR_ID),
342         .idProduct =            __constant_cpu_to_le16(GS_PRODUCT_ID),
343         .iManufacturer =        GS_MANUFACTURER_STR_ID,
344         .iProduct =             GS_PRODUCT_STR_ID,
345         .iSerialNumber =        GS_SERIAL_STR_ID,
346         .bNumConfigurations =   GS_NUM_CONFIGS,
347 };
348
349 static struct usb_otg_descriptor gs_otg_descriptor = {
350         .bLength =              sizeof(gs_otg_descriptor),
351         .bDescriptorType =      USB_DT_OTG,
352         .bmAttributes =         USB_OTG_SRP,
353 };
354
355 static struct usb_config_descriptor gs_bulk_config_desc = {
356         .bLength =              USB_DT_CONFIG_SIZE,
357         .bDescriptorType =      USB_DT_CONFIG,
358         /* .wTotalLength computed dynamically */
359         .bNumInterfaces =       1,
360         .bConfigurationValue =  GS_BULK_CONFIG_ID,
361         .iConfiguration =       GS_BULK_CONFIG_STR_ID,
362         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
363         .bMaxPower =            1,
364 };
365
366 static struct usb_config_descriptor gs_acm_config_desc = {
367         .bLength =              USB_DT_CONFIG_SIZE,
368         .bDescriptorType =      USB_DT_CONFIG,
369         /* .wTotalLength computed dynamically */
370         .bNumInterfaces =       2,
371         .bConfigurationValue =  GS_ACM_CONFIG_ID,
372         .iConfiguration =       GS_ACM_CONFIG_STR_ID,
373         .bmAttributes =         USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
374         .bMaxPower =            1,
375 };
376
377 static const struct usb_interface_descriptor gs_bulk_interface_desc = {
378         .bLength =              USB_DT_INTERFACE_SIZE,
379         .bDescriptorType =      USB_DT_INTERFACE,
380         .bInterfaceNumber =     GS_BULK_INTERFACE_ID,
381         .bNumEndpoints =        2,
382         .bInterfaceClass =      USB_CLASS_CDC_DATA,
383         .bInterfaceSubClass =   0,
384         .bInterfaceProtocol =   0,
385         .iInterface =           GS_DATA_STR_ID,
386 };
387
388 static const struct usb_interface_descriptor gs_control_interface_desc = {
389         .bLength =              USB_DT_INTERFACE_SIZE,
390         .bDescriptorType =      USB_DT_INTERFACE,
391         .bInterfaceNumber =     GS_CONTROL_INTERFACE_ID,
392         .bNumEndpoints =        1,
393         .bInterfaceClass =      USB_CLASS_COMM,
394         .bInterfaceSubClass =   USB_CDC_SUBCLASS_ACM,
395         .bInterfaceProtocol =   USB_CDC_ACM_PROTO_AT_V25TER,
396         .iInterface =           GS_CONTROL_STR_ID,
397 };
398
399 static const struct usb_interface_descriptor gs_data_interface_desc = {
400         .bLength =              USB_DT_INTERFACE_SIZE,
401         .bDescriptorType =      USB_DT_INTERFACE,
402         .bInterfaceNumber =     GS_DATA_INTERFACE_ID,
403         .bNumEndpoints =        2,
404         .bInterfaceClass =      USB_CLASS_CDC_DATA,
405         .bInterfaceSubClass =   0,
406         .bInterfaceProtocol =   0,
407         .iInterface =           GS_DATA_STR_ID,
408 };
409
410 static const struct usb_cdc_header_desc gs_header_desc = {
411         .bLength =              sizeof(gs_header_desc),
412         .bDescriptorType =      USB_DT_CS_INTERFACE,
413         .bDescriptorSubType =   USB_CDC_HEADER_TYPE,
414         .bcdCDC =               __constant_cpu_to_le16(0x0110),
415 };
416
417 static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
418         .bLength =              sizeof(gs_call_mgmt_descriptor),
419         .bDescriptorType =      USB_DT_CS_INTERFACE,
420         .bDescriptorSubType =   USB_CDC_CALL_MANAGEMENT_TYPE,
421         .bmCapabilities =       0,
422         .bDataInterface =       1,      /* index of data interface */
423 };
424
425 static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
426         .bLength =              sizeof(gs_acm_descriptor),
427         .bDescriptorType =      USB_DT_CS_INTERFACE,
428         .bDescriptorSubType =   USB_CDC_ACM_TYPE,
429         .bmCapabilities =       0,
430 };
431
432 static const struct usb_cdc_union_desc gs_union_desc = {
433         .bLength =              sizeof(gs_union_desc),
434         .bDescriptorType =      USB_DT_CS_INTERFACE,
435         .bDescriptorSubType =   USB_CDC_UNION_TYPE,
436         .bMasterInterface0 =    0,      /* index of control interface */
437         .bSlaveInterface0 =     1,      /* index of data interface */
438 };
439  
440 static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
441         .bLength =              USB_DT_ENDPOINT_SIZE,
442         .bDescriptorType =      USB_DT_ENDPOINT,
443         .bEndpointAddress =     USB_DIR_IN,
444         .bmAttributes =         USB_ENDPOINT_XFER_INT,
445         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
446         .bInterval =            1 << GS_LOG2_NOTIFY_INTERVAL,
447 };
448
449 static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
450         .bLength =              USB_DT_ENDPOINT_SIZE,
451         .bDescriptorType =      USB_DT_ENDPOINT,
452         .bEndpointAddress =     USB_DIR_IN,
453         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
454 };
455
456 static struct usb_endpoint_descriptor gs_fullspeed_out_desc = {
457         .bLength =              USB_DT_ENDPOINT_SIZE,
458         .bDescriptorType =      USB_DT_ENDPOINT,
459         .bEndpointAddress =     USB_DIR_OUT,
460         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
461 };
462
463 static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
464         (struct usb_descriptor_header *) &gs_otg_descriptor,
465         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
466         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
467         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
468         NULL,
469 };
470
471 static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
472         (struct usb_descriptor_header *) &gs_otg_descriptor,
473         (struct usb_descriptor_header *) &gs_control_interface_desc,
474         (struct usb_descriptor_header *) &gs_header_desc,
475         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
476         (struct usb_descriptor_header *) &gs_acm_descriptor,
477         (struct usb_descriptor_header *) &gs_union_desc,
478         (struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
479         (struct usb_descriptor_header *) &gs_data_interface_desc,
480         (struct usb_descriptor_header *) &gs_fullspeed_in_desc,
481         (struct usb_descriptor_header *) &gs_fullspeed_out_desc,
482         NULL,
483 };
484
485 #ifdef CONFIG_USB_GADGET_DUALSPEED
486 static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
487         .bLength =              USB_DT_ENDPOINT_SIZE,
488         .bDescriptorType =      USB_DT_ENDPOINT,
489         .bEndpointAddress =     USB_DIR_IN,
490         .bmAttributes =         USB_ENDPOINT_XFER_INT,
491         .wMaxPacketSize =       __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
492         .bInterval =            GS_LOG2_NOTIFY_INTERVAL+4,
493 };
494
495 static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
496         .bLength =              USB_DT_ENDPOINT_SIZE,
497         .bDescriptorType =      USB_DT_ENDPOINT,
498         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
499         .wMaxPacketSize =       __constant_cpu_to_le16(512),
500 };
501
502 static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
503         .bLength =              USB_DT_ENDPOINT_SIZE,
504         .bDescriptorType =      USB_DT_ENDPOINT,
505         .bmAttributes =         USB_ENDPOINT_XFER_BULK,
506         .wMaxPacketSize =       __constant_cpu_to_le16(512),
507 };
508
509 static struct usb_qualifier_descriptor gs_qualifier_desc = {
510         .bLength =              sizeof(struct usb_qualifier_descriptor),
511         .bDescriptorType =      USB_DT_DEVICE_QUALIFIER,
512         .bcdUSB =               __constant_cpu_to_le16 (0x0200),
513         /* assumes ep0 uses the same value for both speeds ... */
514         .bNumConfigurations =   GS_NUM_CONFIGS,
515 };
516
517 static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
518         (struct usb_descriptor_header *) &gs_otg_descriptor,
519         (struct usb_descriptor_header *) &gs_bulk_interface_desc,
520         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
521         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
522         NULL,
523 };
524
525 static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
526         (struct usb_descriptor_header *) &gs_otg_descriptor,
527         (struct usb_descriptor_header *) &gs_control_interface_desc,
528         (struct usb_descriptor_header *) &gs_header_desc,
529         (struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
530         (struct usb_descriptor_header *) &gs_acm_descriptor,
531         (struct usb_descriptor_header *) &gs_union_desc,
532         (struct usb_descriptor_header *) &gs_highspeed_notify_desc,
533         (struct usb_descriptor_header *) &gs_data_interface_desc,
534         (struct usb_descriptor_header *) &gs_highspeed_in_desc,
535         (struct usb_descriptor_header *) &gs_highspeed_out_desc,
536         NULL,
537 };
538
539 #endif /* CONFIG_USB_GADGET_DUALSPEED */
540
541
542 /* Module */
543 MODULE_DESCRIPTION(GS_LONG_NAME);
544 MODULE_AUTHOR("Al Borchers");
545 MODULE_LICENSE("GPL");
546
547 #ifdef GS_DEBUG
548 module_param(debug, int, S_IRUGO|S_IWUSR);
549 MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
550 #endif
551
552 module_param(read_q_size, uint, S_IRUGO);
553 MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
554
555 module_param(write_q_size, uint, S_IRUGO);
556 MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
557
558 module_param(write_buf_size, uint, S_IRUGO);
559 MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
560
561 module_param(use_acm, uint, S_IRUGO);
562 MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
563
564 module_init(gs_module_init);
565 module_exit(gs_module_exit);
566
567 /*
568 *  gs_module_init
569 *
570 *  Register as a USB gadget driver and a tty driver.
571 */
572 static int __init gs_module_init(void)
573 {
574         int i;
575         int retval;
576
577         retval = usb_gadget_register_driver(&gs_gadget_driver);
578         if (retval) {
579                 printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
580                 return retval;
581         }
582
583         gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
584         if (!gs_tty_driver)
585                 return -ENOMEM;
586         gs_tty_driver->owner = THIS_MODULE;
587         gs_tty_driver->driver_name = GS_SHORT_NAME;
588         gs_tty_driver->name = "ttygs";
589         gs_tty_driver->major = GS_MAJOR;
590         gs_tty_driver->minor_start = GS_MINOR_START;
591         gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
592         gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
593         gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
594         gs_tty_driver->init_termios = tty_std_termios;
595         gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
596         tty_set_operations(gs_tty_driver, &gs_tty_ops);
597
598         for (i=0; i < GS_NUM_PORTS; i++)
599                 mutex_init(&gs_open_close_lock[i]);
600
601         retval = tty_register_driver(gs_tty_driver);
602         if (retval) {
603                 usb_gadget_unregister_driver(&gs_gadget_driver);
604                 put_tty_driver(gs_tty_driver);
605                 printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
606                 return retval;
607         }
608
609         printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
610         return 0;
611 }
612
613 /*
614 * gs_module_exit
615 *
616 * Unregister as a tty driver and a USB gadget driver.
617 */
618 static void __exit gs_module_exit(void)
619 {
620         tty_unregister_driver(gs_tty_driver);
621         put_tty_driver(gs_tty_driver);
622         usb_gadget_unregister_driver(&gs_gadget_driver);
623
624         printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
625 }
626
627 /* TTY Driver */
628
629 /*
630  * gs_open
631  */
632 static int gs_open(struct tty_struct *tty, struct file *file)
633 {
634         int port_num;
635         unsigned long flags;
636         struct gs_port *port;
637         struct gs_dev *dev;
638         struct gs_buf *buf;
639         struct mutex *mtx;
640         int ret;
641
642         port_num = tty->index;
643
644         gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
645
646         if (port_num < 0 || port_num >= GS_NUM_PORTS) {
647                 printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
648                         port_num, tty, file);
649                 return -ENODEV;
650         }
651
652         dev = gs_device;
653
654         if (dev == NULL) {
655                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
656                         port_num, tty, file);
657                 return -ENODEV;
658         }
659
660         mtx = &gs_open_close_lock[port_num];
661         if (mutex_lock_interruptible(mtx)) {
662                 printk(KERN_ERR
663                 "gs_open: (%d,%p,%p) interrupted waiting for mutex\n",
664                         port_num, tty, file);
665                 return -ERESTARTSYS;
666         }
667
668         spin_lock_irqsave(&dev->dev_lock, flags);
669
670         if (dev->dev_config == GS_NO_CONFIG_ID) {
671                 printk(KERN_ERR
672                         "gs_open: (%d,%p,%p) device is not connected\n",
673                         port_num, tty, file);
674                 ret = -ENODEV;
675                 goto exit_unlock_dev;
676         }
677
678         port = dev->dev_port[port_num];
679
680         if (port == NULL) {
681                 printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
682                         port_num, tty, file);
683                 ret = -ENODEV;
684                 goto exit_unlock_dev;
685         }
686
687         spin_lock(&port->port_lock);
688         spin_unlock(&dev->dev_lock);
689
690         if (port->port_dev == NULL) {
691                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
692                         port_num, tty, file);
693                 ret = -EIO;
694                 goto exit_unlock_port;
695         }
696
697         if (port->port_open_count > 0) {
698                 ++port->port_open_count;
699                 gs_debug("gs_open: (%d,%p,%p) already open\n",
700                         port_num, tty, file);
701                 ret = 0;
702                 goto exit_unlock_port;
703         }
704
705         tty->driver_data = NULL;
706
707         /* mark port as in use, we can drop port lock and sleep if necessary */
708         port->port_in_use = 1;
709
710         /* allocate write buffer on first open */
711         if (port->port_write_buf == NULL) {
712                 spin_unlock_irqrestore(&port->port_lock, flags);
713                 buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
714                 spin_lock_irqsave(&port->port_lock, flags);
715
716                 /* might have been disconnected while asleep, check */
717                 if (port->port_dev == NULL) {
718                         printk(KERN_ERR
719                                 "gs_open: (%d,%p,%p) port disconnected (2)\n",
720                                 port_num, tty, file);
721                         port->port_in_use = 0;
722                         ret = -EIO;
723                         goto exit_unlock_port;
724                 }
725
726                 if ((port->port_write_buf=buf) == NULL) {
727                         printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
728                                 port_num, tty, file);
729                         port->port_in_use = 0;
730                         ret = -ENOMEM;
731                         goto exit_unlock_port;
732                 }
733
734         }
735
736         /* wait for carrier detect (not implemented) */
737
738         /* might have been disconnected while asleep, check */
739         if (port->port_dev == NULL) {
740                 printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
741                         port_num, tty, file);
742                 port->port_in_use = 0;
743                 ret = -EIO;
744                 goto exit_unlock_port;
745         }
746
747         tty->driver_data = port;
748         port->port_tty = tty;
749         port->port_open_count = 1;
750         port->port_in_use = 0;
751
752         gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
753
754         ret = 0;
755
756 exit_unlock_port:
757         spin_unlock_irqrestore(&port->port_lock, flags);
758         mutex_unlock(mtx);
759         return ret;
760
761 exit_unlock_dev:
762         spin_unlock_irqrestore(&dev->dev_lock, flags);
763         mutex_unlock(mtx);
764         return ret;
765
766 }
767
768 /*
769  * gs_close
770  */
771
772 #define GS_WRITE_FINISHED_EVENT_SAFELY(p)                       \
773 ({                                                              \
774         int cond;                                               \
775                                                                 \
776         spin_lock_irq(&(p)->port_lock);                         \
777         cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); \
778         spin_unlock_irq(&(p)->port_lock);                       \
779         cond;                                                   \
780 })
781
782 static void gs_close(struct tty_struct *tty, struct file *file)
783 {
784         struct gs_port *port = tty->driver_data;
785         struct mutex *mtx;
786
787         if (port == NULL) {
788                 printk(KERN_ERR "gs_close: NULL port pointer\n");
789                 return;
790         }
791
792         gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
793
794         mtx = &gs_open_close_lock[port->port_num];
795         mutex_lock(mtx);
796
797         spin_lock_irq(&port->port_lock);
798
799         if (port->port_open_count == 0) {
800                 printk(KERN_ERR
801                         "gs_close: (%d,%p,%p) port is already closed\n",
802                         port->port_num, tty, file);
803                 goto exit;
804         }
805
806         if (port->port_open_count > 1) {
807                 --port->port_open_count;
808                 goto exit;
809         }
810
811         /* free disconnected port on final close */
812         if (port->port_dev == NULL) {
813                 kfree(port);
814                 goto exit;
815         }
816
817         /* mark port as closed but in use, we can drop port lock */
818         /* and sleep if necessary */
819         port->port_in_use = 1;
820         port->port_open_count = 0;
821
822         /* wait for write buffer to drain, or */
823         /* at most GS_CLOSE_TIMEOUT seconds */
824         if (gs_buf_data_avail(port->port_write_buf) > 0) {
825                 spin_unlock_irq(&port->port_lock);
826                 wait_event_interruptible_timeout(port->port_write_wait,
827                                         GS_WRITE_FINISHED_EVENT_SAFELY(port),
828                                         GS_CLOSE_TIMEOUT * HZ);
829                 spin_lock_irq(&port->port_lock);
830         }
831
832         /* free disconnected port on final close */
833         /* (might have happened during the above sleep) */
834         if (port->port_dev == NULL) {
835                 kfree(port);
836                 goto exit;
837         }
838
839         gs_buf_clear(port->port_write_buf);
840
841         tty->driver_data = NULL;
842         port->port_tty = NULL;
843         port->port_in_use = 0;
844
845         gs_debug("gs_close: (%d,%p,%p) completed\n",
846                 port->port_num, tty, file);
847
848 exit:
849         spin_unlock_irq(&port->port_lock);
850         mutex_unlock(mtx);
851 }
852
853 /*
854  * gs_write
855  */
856 static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
857 {
858         unsigned long flags;
859         struct gs_port *port = tty->driver_data;
860         int ret;
861
862         if (port == NULL) {
863                 printk(KERN_ERR "gs_write: NULL port pointer\n");
864                 return -EIO;
865         }
866
867         gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
868                 count);
869
870         if (count == 0)
871                 return 0;
872
873         spin_lock_irqsave(&port->port_lock, flags);
874
875         if (port->port_dev == NULL) {
876                 printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
877                         port->port_num, tty);
878                 ret = -EIO;
879                 goto exit;
880         }
881
882         if (port->port_open_count == 0) {
883                 printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
884                         port->port_num, tty);
885                 ret = -EBADF;
886                 goto exit;
887         }
888
889         count = gs_buf_put(port->port_write_buf, buf, count);
890
891         spin_unlock_irqrestore(&port->port_lock, flags);
892
893         gs_send(gs_device);
894
895         gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
896                 count);
897
898         return count;
899
900 exit:
901         spin_unlock_irqrestore(&port->port_lock, flags);
902         return ret;
903 }
904
905 /*
906  * gs_put_char
907  */
908 static void gs_put_char(struct tty_struct *tty, unsigned char ch)
909 {
910         unsigned long flags;
911         struct gs_port *port = tty->driver_data;
912
913         if (port == NULL) {
914                 printk(KERN_ERR "gs_put_char: NULL port pointer\n");
915                 return;
916         }
917
918         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));
919
920         spin_lock_irqsave(&port->port_lock, flags);
921
922         if (port->port_dev == NULL) {
923                 printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
924                         port->port_num, tty);
925                 goto exit;
926         }
927
928         if (port->port_open_count == 0) {
929                 printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
930                         port->port_num, tty);
931                 goto exit;
932         }
933
934         gs_buf_put(port->port_write_buf, &ch, 1);
935
936 exit:
937         spin_unlock_irqrestore(&port->port_lock, flags);
938 }
939
940 /*
941  * gs_flush_chars
942  */
943 static void gs_flush_chars(struct tty_struct *tty)
944 {
945         unsigned long flags;
946         struct gs_port *port = tty->driver_data;
947
948         if (port == NULL) {
949                 printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
950                 return;
951         }
952
953         gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
954
955         spin_lock_irqsave(&port->port_lock, flags);
956
957         if (port->port_dev == NULL) {
958                 printk(KERN_ERR
959                         "gs_flush_chars: (%d,%p) port is not connected\n",
960                         port->port_num, tty);
961                 goto exit;
962         }
963
964         if (port->port_open_count == 0) {
965                 printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
966                         port->port_num, tty);
967                 goto exit;
968         }
969
970         spin_unlock_irqrestore(&port->port_lock, flags);
971
972         gs_send(gs_device);
973
974         return;
975
976 exit:
977         spin_unlock_irqrestore(&port->port_lock, flags);
978 }
979
980 /*
981  * gs_write_room
982  */
983 static int gs_write_room(struct tty_struct *tty)
984 {
985
986         int room = 0;
987         unsigned long flags;
988         struct gs_port *port = tty->driver_data;
989
990
991         if (port == NULL)
992                 return 0;
993
994         spin_lock_irqsave(&port->port_lock, flags);
995
996         if (port->port_dev != NULL && port->port_open_count > 0
997         && port->port_write_buf != NULL)
998                 room = gs_buf_space_avail(port->port_write_buf);
999
1000         spin_unlock_irqrestore(&port->port_lock, flags);
1001
1002         gs_debug("gs_write_room: (%d,%p) room=%d\n",
1003                 port->port_num, tty, room);
1004
1005         return room;
1006 }
1007
1008 /*
1009  * gs_chars_in_buffer
1010  */
1011 static int gs_chars_in_buffer(struct tty_struct *tty)
1012 {
1013         int chars = 0;
1014         unsigned long flags;
1015         struct gs_port *port = tty->driver_data;
1016
1017         if (port == NULL)
1018                 return 0;
1019
1020         spin_lock_irqsave(&port->port_lock, flags);
1021
1022         if (port->port_dev != NULL && port->port_open_count > 0
1023         && port->port_write_buf != NULL)
1024                 chars = gs_buf_data_avail(port->port_write_buf);
1025
1026         spin_unlock_irqrestore(&port->port_lock, flags);
1027
1028         gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
1029                 port->port_num, tty, chars);
1030
1031         return chars;
1032 }
1033
1034 /*
1035  * gs_throttle
1036  */
1037 static void gs_throttle(struct tty_struct *tty)
1038 {
1039 }
1040
1041 /*
1042  * gs_unthrottle
1043  */
1044 static void gs_unthrottle(struct tty_struct *tty)
1045 {
1046 }
1047
1048 /*
1049  * gs_break
1050  */
1051 static void gs_break(struct tty_struct *tty, int break_state)
1052 {
1053 }
1054
1055 /*
1056  * gs_ioctl
1057  */
1058 static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
1059 {
1060         struct gs_port *port = tty->driver_data;
1061
1062         if (port == NULL) {
1063                 printk(KERN_ERR "gs_ioctl: NULL port pointer\n");
1064                 return -EIO;
1065         }
1066
1067         gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
1068                 port->port_num, tty, file, cmd, arg);
1069
1070         /* handle ioctls */
1071
1072         /* could not handle ioctl */
1073         return -ENOIOCTLCMD;
1074 }
1075
1076 /*
1077  * gs_set_termios
1078  */
1079 static void gs_set_termios(struct tty_struct *tty, struct ktermios *old)
1080 {
1081 }
1082
1083 /*
1084 * gs_send
1085 *
1086 * This function finds available write requests, calls
1087 * gs_send_packet to fill these packets with data, and
1088 * continues until either there are no more write requests
1089 * available or no more data to send.  This function is
1090 * run whenever data arrives or write requests are available.
1091 */
1092 static int gs_send(struct gs_dev *dev)
1093 {
1094         int ret,len;
1095         unsigned long flags;
1096         struct usb_ep *ep;
1097         struct usb_request *req;
1098         struct gs_req_entry *req_entry;
1099
1100         if (dev == NULL) {
1101                 printk(KERN_ERR "gs_send: NULL device pointer\n");
1102                 return -ENODEV;
1103         }
1104
1105         spin_lock_irqsave(&dev->dev_lock, flags);
1106
1107         ep = dev->dev_in_ep;
1108
1109         while(!list_empty(&dev->dev_req_list)) {
1110
1111                 req_entry = list_entry(dev->dev_req_list.next,
1112                         struct gs_req_entry, re_entry);
1113
1114                 req = req_entry->re_req;
1115
1116                 len = gs_send_packet(dev, req->buf, ep->maxpacket);
1117
1118                 if (len > 0) {
1119 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));
1120                         list_del(&req_entry->re_entry);
1121                         req->length = len;
1122                         spin_unlock_irqrestore(&dev->dev_lock, flags);
1123                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1124                                 printk(KERN_ERR
1125                                 "gs_send: cannot queue read request, ret=%d\n",
1126                                         ret);
1127                                 spin_lock_irqsave(&dev->dev_lock, flags);
1128                                 break;
1129                         }
1130                         spin_lock_irqsave(&dev->dev_lock, flags);
1131                 } else {
1132                         break;
1133                 }
1134
1135         }
1136
1137         spin_unlock_irqrestore(&dev->dev_lock, flags);
1138
1139         return 0;
1140 }
1141
1142 /*
1143  * gs_send_packet
1144  *
1145  * If there is data to send, a packet is built in the given
1146  * buffer and the size is returned.  If there is no data to
1147  * send, 0 is returned.  If there is any error a negative
1148  * error number is returned.
1149  *
1150  * Called during USB completion routine, on interrupt time.
1151  *
1152  * We assume that disconnect will not happen until all completion
1153  * routines have completed, so we can assume that the dev_port
1154  * array does not change during the lifetime of this function.
1155  */
1156 static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
1157 {
1158         unsigned int len;
1159         struct gs_port *port;
1160
1161         /* TEMPORARY -- only port 0 is supported right now */
1162         port = dev->dev_port[0];
1163
1164         if (port == NULL) {
1165                 printk(KERN_ERR
1166                         "gs_send_packet: port=%d, NULL port pointer\n",
1167                         0);
1168                 return -EIO;
1169         }
1170
1171         spin_lock(&port->port_lock);
1172
1173         len = gs_buf_data_avail(port->port_write_buf);
1174         if (len < size)
1175                 size = len;
1176
1177         if (size == 0)
1178                 goto exit;
1179
1180         size = gs_buf_get(port->port_write_buf, packet, size);
1181
1182         if (port->port_tty)
1183                 wake_up_interruptible(&port->port_tty->write_wait);
1184
1185 exit:
1186         spin_unlock(&port->port_lock);
1187         return size;
1188 }
1189
1190 /*
1191  * gs_recv_packet
1192  *
1193  * Called for each USB packet received.  Reads the packet
1194  * header and stuffs the data in the appropriate tty buffer.
1195  * Returns 0 if successful, or a negative error number.
1196  *
1197  * Called during USB completion routine, on interrupt time.
1198  *
1199  * We assume that disconnect will not happen until all completion
1200  * routines have completed, so we can assume that the dev_port
1201  * array does not change during the lifetime of this function.
1202  */
1203 static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
1204 {
1205         unsigned int len;
1206         struct gs_port *port;
1207         int ret;
1208         struct tty_struct *tty;
1209
1210         /* TEMPORARY -- only port 0 is supported right now */
1211         port = dev->dev_port[0];
1212
1213         if (port == NULL) {
1214                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL port pointer\n",
1215                         port->port_num);
1216                 return -EIO;
1217         }
1218
1219         spin_lock(&port->port_lock);
1220
1221         if (port->port_open_count == 0) {
1222                 printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
1223                         port->port_num);
1224                 ret = -EIO;
1225                 goto exit;
1226         }
1227
1228
1229         tty = port->port_tty;
1230
1231         if (tty == NULL) {
1232                 printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
1233                         port->port_num);
1234                 ret = -EIO;
1235                 goto exit;
1236         }
1237
1238         if (port->port_tty->magic != TTY_MAGIC) {
1239                 printk(KERN_ERR "gs_recv_packet: port=%d, bad tty magic\n",
1240                         port->port_num);
1241                 ret = -EIO;
1242                 goto exit;
1243         }
1244
1245         len = tty_buffer_request_room(tty, size);
1246         if (len > 0) {
1247                 tty_insert_flip_string(tty, packet, len);
1248                 tty_flip_buffer_push(port->port_tty);
1249                 wake_up_interruptible(&port->port_tty->read_wait);
1250         }
1251         ret = 0;
1252 exit:
1253         spin_unlock(&port->port_lock);
1254         return ret;
1255 }
1256
1257 /*
1258 * gs_read_complete
1259 */
1260 static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
1261 {
1262         int ret;
1263         struct gs_dev *dev = ep->driver_data;
1264
1265         if (dev == NULL) {
1266                 printk(KERN_ERR "gs_read_complete: NULL device pointer\n");
1267                 return;
1268         }
1269
1270         switch(req->status) {
1271         case 0:
1272                 /* normal completion */
1273                 gs_recv_packet(dev, req->buf, req->actual);
1274 requeue:
1275                 req->length = ep->maxpacket;
1276                 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1277                         printk(KERN_ERR
1278                         "gs_read_complete: cannot queue read request, ret=%d\n",
1279                                 ret);
1280                 }
1281                 break;
1282
1283         case -ESHUTDOWN:
1284                 /* disconnect */
1285                 gs_debug("gs_read_complete: shutdown\n");
1286                 gs_free_req(ep, req);
1287                 break;
1288
1289         default:
1290                 /* unexpected */
1291                 printk(KERN_ERR
1292                 "gs_read_complete: unexpected status error, status=%d\n",
1293                         req->status);
1294                 goto requeue;
1295                 break;
1296         }
1297 }
1298
1299 /*
1300 * gs_write_complete
1301 */
1302 static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
1303 {
1304         struct gs_dev *dev = ep->driver_data;
1305         struct gs_req_entry *gs_req = req->context;
1306
1307         if (dev == NULL) {
1308                 printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
1309                 return;
1310         }
1311
1312         switch(req->status) {
1313         case 0:
1314                 /* normal completion */
1315 requeue:
1316                 if (gs_req == NULL) {
1317                         printk(KERN_ERR
1318                                 "gs_write_complete: NULL request pointer\n");
1319                         return;
1320                 }
1321
1322                 spin_lock(&dev->dev_lock);
1323                 list_add(&gs_req->re_entry, &dev->dev_req_list);
1324                 spin_unlock(&dev->dev_lock);
1325
1326                 gs_send(dev);
1327
1328                 break;
1329
1330         case -ESHUTDOWN:
1331                 /* disconnect */
1332                 gs_debug("gs_write_complete: shutdown\n");
1333                 gs_free_req(ep, req);
1334                 break;
1335
1336         default:
1337                 printk(KERN_ERR
1338                 "gs_write_complete: unexpected status error, status=%d\n",
1339                         req->status);
1340                 goto requeue;
1341                 break;
1342         }
1343 }
1344
1345 /* Gadget Driver */
1346
1347 /*
1348  * gs_bind
1349  *
1350  * Called on module load.  Allocates and initializes the device
1351  * structure and a control request.
1352  */
1353 static int __init gs_bind(struct usb_gadget *gadget)
1354 {
1355         int ret;
1356         struct usb_ep *ep;
1357         struct gs_dev *dev;
1358         int gcnum;
1359
1360         /* Some controllers can't support CDC ACM:
1361          * - sh doesn't support multiple interfaces or configs;
1362          * - sa1100 doesn't have a third interrupt endpoint
1363          */
1364         if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
1365                 use_acm = 0;
1366
1367         gcnum = usb_gadget_controller_number(gadget);
1368         if (gcnum >= 0)
1369                 gs_device_desc.bcdDevice =
1370                                 cpu_to_le16(GS_VERSION_NUM | gcnum);
1371         else {
1372                 printk(KERN_WARNING "gs_bind: controller '%s' not recognized\n",
1373                         gadget->name);
1374                 /* unrecognized, but safe unless bulk is REALLY quirky */
1375                 gs_device_desc.bcdDevice =
1376                         __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
1377         }
1378
1379         usb_ep_autoconfig_reset(gadget);
1380
1381         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1382         if (!ep)
1383                 goto autoconf_fail;
1384         EP_IN_NAME = ep->name;
1385         ep->driver_data = ep;   /* claim the endpoint */
1386
1387         ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1388         if (!ep)
1389                 goto autoconf_fail;
1390         EP_OUT_NAME = ep->name;
1391         ep->driver_data = ep;   /* claim the endpoint */
1392
1393         if (use_acm) {
1394                 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
1395                 if (!ep) {
1396                         printk(KERN_ERR "gs_bind: cannot run ACM on %s\n", gadget->name);
1397                         goto autoconf_fail;
1398                 }
1399                 gs_device_desc.idProduct = __constant_cpu_to_le16(
1400                                                 GS_CDC_PRODUCT_ID),
1401                 EP_NOTIFY_NAME = ep->name;
1402                 ep->driver_data = ep;   /* claim the endpoint */
1403         }
1404
1405         gs_device_desc.bDeviceClass = use_acm
1406                 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1407         gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
1408
1409 #ifdef CONFIG_USB_GADGET_DUALSPEED
1410         gs_qualifier_desc.bDeviceClass = use_acm
1411                 ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
1412         /* assume ep0 uses the same packet size for both speeds */
1413         gs_qualifier_desc.bMaxPacketSize0 = gs_device_desc.bMaxPacketSize0;
1414         /* assume endpoints are dual-speed */
1415         gs_highspeed_notify_desc.bEndpointAddress =
1416                 gs_fullspeed_notify_desc.bEndpointAddress;
1417         gs_highspeed_in_desc.bEndpointAddress =
1418                 gs_fullspeed_in_desc.bEndpointAddress;
1419         gs_highspeed_out_desc.bEndpointAddress =
1420                 gs_fullspeed_out_desc.bEndpointAddress;
1421 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1422
1423         usb_gadget_set_selfpowered(gadget);
1424
1425         if (gadget->is_otg) {
1426                 gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
1427                 gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1428                 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1429         }
1430
1431         gs_device = dev = kzalloc(sizeof(struct gs_dev), GFP_KERNEL);
1432         if (dev == NULL)
1433                 return -ENOMEM;
1434
1435         snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1436                 init_utsname()->sysname, init_utsname()->release,
1437                 gadget->name);
1438
1439         dev->dev_gadget = gadget;
1440         spin_lock_init(&dev->dev_lock);
1441         INIT_LIST_HEAD(&dev->dev_req_list);
1442         set_gadget_data(gadget, dev);
1443
1444         if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1445                 printk(KERN_ERR "gs_bind: cannot allocate ports\n");
1446                 gs_unbind(gadget);
1447                 return ret;
1448         }
1449
1450         /* preallocate control response and buffer */
1451         dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1452                 GFP_KERNEL);
1453         if (dev->dev_ctrl_req == NULL) {
1454                 gs_unbind(gadget);
1455                 return -ENOMEM;
1456         }
1457         dev->dev_ctrl_req->complete = gs_setup_complete;
1458
1459         gadget->ep0->driver_data = dev;
1460
1461         printk(KERN_INFO "gs_bind: %s %s bound\n",
1462                 GS_LONG_NAME, GS_VERSION_STR);
1463
1464         return 0;
1465
1466 autoconf_fail:
1467         printk(KERN_ERR "gs_bind: cannot autoconfigure on %s\n", gadget->name);
1468         return -ENODEV;
1469 }
1470
1471 /*
1472  * gs_unbind
1473  *
1474  * Called on module unload.  Frees the control request and device
1475  * structure.
1476  */
1477 static void /* __init_or_exit */ gs_unbind(struct usb_gadget *gadget)
1478 {
1479         struct gs_dev *dev = get_gadget_data(gadget);
1480
1481         gs_device = NULL;
1482
1483         /* read/write requests already freed, only control request remains */
1484         if (dev != NULL) {
1485                 if (dev->dev_ctrl_req != NULL) {
1486                         gs_free_req(gadget->ep0, dev->dev_ctrl_req);
1487                         dev->dev_ctrl_req = NULL;
1488                 }
1489                 gs_free_ports(dev);
1490                 kfree(dev);
1491                 set_gadget_data(gadget, NULL);
1492         }
1493
1494         printk(KERN_INFO "gs_unbind: %s %s unbound\n", GS_LONG_NAME,
1495                 GS_VERSION_STR);
1496 }
1497
1498 /*
1499  * gs_setup
1500  *
1501  * Implements all the control endpoint functionality that's not
1502  * handled in hardware or the hardware driver.
1503  *
1504  * Returns the size of the data sent to the host, or a negative
1505  * error number.
1506  */
1507 static int gs_setup(struct usb_gadget *gadget,
1508         const struct usb_ctrlrequest *ctrl)
1509 {
1510         int ret = -EOPNOTSUPP;
1511         struct gs_dev *dev = get_gadget_data(gadget);
1512         struct usb_request *req = dev->dev_ctrl_req;
1513         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1514         u16 wValue = le16_to_cpu(ctrl->wValue);
1515         u16 wLength = le16_to_cpu(ctrl->wLength);
1516
1517         switch (ctrl->bRequestType & USB_TYPE_MASK) {
1518         case USB_TYPE_STANDARD:
1519                 ret = gs_setup_standard(gadget,ctrl);
1520                 break;
1521
1522         case USB_TYPE_CLASS:
1523                 ret = gs_setup_class(gadget,ctrl);
1524                 break;
1525
1526         default:
1527                 printk(KERN_ERR "gs_setup: unknown request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1528                         ctrl->bRequestType, ctrl->bRequest,
1529                         wValue, wIndex, wLength);
1530                 break;
1531         }
1532
1533         /* respond with data transfer before status phase? */
1534         if (ret >= 0) {
1535                 req->length = ret;
1536                 req->zero = ret < wLength
1537                                 && (ret % gadget->ep0->maxpacket) == 0;
1538                 ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
1539                 if (ret < 0) {
1540                         printk(KERN_ERR "gs_setup: cannot queue response, ret=%d\n",
1541                                 ret);
1542                         req->status = 0;
1543                         gs_setup_complete(gadget->ep0, req);
1544                 }
1545         }
1546
1547         /* device either stalls (ret < 0) or reports success */
1548         return ret;
1549 }
1550
1551 static int gs_setup_standard(struct usb_gadget *gadget,
1552         const struct usb_ctrlrequest *ctrl)
1553 {
1554         int ret = -EOPNOTSUPP;
1555         struct gs_dev *dev = get_gadget_data(gadget);
1556         struct usb_request *req = dev->dev_ctrl_req;
1557         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1558         u16 wValue = le16_to_cpu(ctrl->wValue);
1559         u16 wLength = le16_to_cpu(ctrl->wLength);
1560
1561         switch (ctrl->bRequest) {
1562         case USB_REQ_GET_DESCRIPTOR:
1563                 if (ctrl->bRequestType != USB_DIR_IN)
1564                         break;
1565
1566                 switch (wValue >> 8) {
1567                 case USB_DT_DEVICE:
1568                         ret = min(wLength,
1569                                 (u16)sizeof(struct usb_device_descriptor));
1570                         memcpy(req->buf, &gs_device_desc, ret);
1571                         break;
1572
1573 #ifdef CONFIG_USB_GADGET_DUALSPEED
1574                 case USB_DT_DEVICE_QUALIFIER:
1575                         if (!gadget->is_dualspeed)
1576                                 break;
1577                         ret = min(wLength,
1578                                 (u16)sizeof(struct usb_qualifier_descriptor));
1579                         memcpy(req->buf, &gs_qualifier_desc, ret);
1580                         break;
1581
1582                 case USB_DT_OTHER_SPEED_CONFIG:
1583                         if (!gadget->is_dualspeed)
1584                                 break;
1585                         /* fall through */
1586 #endif /* CONFIG_USB_GADGET_DUALSPEED */
1587                 case USB_DT_CONFIG:
1588                         ret = gs_build_config_buf(req->buf, gadget->speed,
1589                                 wValue >> 8, wValue & 0xff,
1590                                 gadget->is_otg);
1591                         if (ret >= 0)
1592                                 ret = min(wLength, (u16)ret);
1593                         break;
1594
1595                 case USB_DT_STRING:
1596                         /* wIndex == language code. */
1597                         ret = usb_gadget_get_string(&gs_string_table,
1598                                 wValue & 0xff, req->buf);
1599                         if (ret >= 0)
1600                                 ret = min(wLength, (u16)ret);
1601                         break;
1602                 }
1603                 break;
1604
1605         case USB_REQ_SET_CONFIGURATION:
1606                 if (ctrl->bRequestType != 0)
1607                         break;
1608                 spin_lock(&dev->dev_lock);
1609                 ret = gs_set_config(dev, wValue);
1610                 spin_unlock(&dev->dev_lock);
1611                 break;
1612
1613         case USB_REQ_GET_CONFIGURATION:
1614                 if (ctrl->bRequestType != USB_DIR_IN)
1615                         break;
1616                 *(u8 *)req->buf = dev->dev_config;
1617                 ret = min(wLength, (u16)1);
1618                 break;
1619
1620         case USB_REQ_SET_INTERFACE:
1621                 if (ctrl->bRequestType != USB_RECIP_INTERFACE
1622                                 || !dev->dev_config
1623                                 || wIndex >= GS_MAX_NUM_INTERFACES)
1624                         break;
1625                 if (dev->dev_config == GS_BULK_CONFIG_ID
1626                                 && wIndex != GS_BULK_INTERFACE_ID)
1627                         break;
1628                 /* no alternate interface settings */
1629                 if (wValue != 0)
1630                         break;
1631                 spin_lock(&dev->dev_lock);
1632                 /* PXA hardware partially handles SET_INTERFACE;
1633                  * we need to kluge around that interference.  */
1634                 if (gadget_is_pxa(gadget)) {
1635                         ret = gs_set_config(dev, use_acm ?
1636                                 GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
1637                         goto set_interface_done;
1638                 }
1639                 if (dev->dev_config != GS_BULK_CONFIG_ID
1640                                 && wIndex == GS_CONTROL_INTERFACE_ID) {
1641                         if (dev->dev_notify_ep) {
1642                                 usb_ep_disable(dev->dev_notify_ep);
1643                                 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
1644                         }
1645                 } else {
1646                         usb_ep_disable(dev->dev_in_ep);
1647                         usb_ep_disable(dev->dev_out_ep);
1648                         usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1649                         usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1650                 }
1651                 ret = 0;
1652 set_interface_done:
1653                 spin_unlock(&dev->dev_lock);
1654                 break;
1655
1656         case USB_REQ_GET_INTERFACE:
1657                 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
1658                 || dev->dev_config == GS_NO_CONFIG_ID)
1659                         break;
1660                 if (wIndex >= GS_MAX_NUM_INTERFACES
1661                                 || (dev->dev_config == GS_BULK_CONFIG_ID
1662                                 && wIndex != GS_BULK_INTERFACE_ID)) {
1663                         ret = -EDOM;
1664                         break;
1665                 }
1666                 /* no alternate interface settings */
1667                 *(u8 *)req->buf = 0;
1668                 ret = min(wLength, (u16)1);
1669                 break;
1670
1671         default:
1672                 printk(KERN_ERR "gs_setup: unknown standard request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1673                         ctrl->bRequestType, ctrl->bRequest,
1674                         wValue, wIndex, wLength);
1675                 break;
1676         }
1677
1678         return ret;
1679 }
1680
1681 static int gs_setup_class(struct usb_gadget *gadget,
1682         const struct usb_ctrlrequest *ctrl)
1683 {
1684         int ret = -EOPNOTSUPP;
1685         struct gs_dev *dev = get_gadget_data(gadget);
1686         struct gs_port *port = dev->dev_port[0];        /* ACM only has one port */
1687         struct usb_request *req = dev->dev_ctrl_req;
1688         u16 wIndex = le16_to_cpu(ctrl->wIndex);
1689         u16 wValue = le16_to_cpu(ctrl->wValue);
1690         u16 wLength = le16_to_cpu(ctrl->wLength);
1691
1692         switch (ctrl->bRequest) {
1693         case USB_CDC_REQ_SET_LINE_CODING:
1694                 ret = min(wLength,
1695                         (u16)sizeof(struct usb_cdc_line_coding));
1696                 if (port) {
1697                         spin_lock(&port->port_lock);
1698                         memcpy(&port->port_line_coding, req->buf, ret);
1699                         spin_unlock(&port->port_lock);
1700                 }
1701                 ret = 0;
1702                 break;
1703
1704         case USB_CDC_REQ_GET_LINE_CODING:
1705                 port = dev->dev_port[0];        /* ACM only has one port */
1706                 ret = min(wLength,
1707                         (u16)sizeof(struct usb_cdc_line_coding));
1708                 if (port) {
1709                         spin_lock(&port->port_lock);
1710                         memcpy(req->buf, &port->port_line_coding, ret);
1711                         spin_unlock(&port->port_lock);
1712                 }
1713                 break;
1714
1715         case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1716                 ret = 0;
1717                 break;
1718
1719         default:
1720                 printk(KERN_ERR "gs_setup: unknown class request, type=%02x, request=%02x, value=%04x, index=%04x, length=%d\n",
1721                         ctrl->bRequestType, ctrl->bRequest,
1722                         wValue, wIndex, wLength);
1723                 break;
1724         }
1725
1726         return ret;
1727 }
1728
1729 /*
1730  * gs_setup_complete
1731  */
1732 static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
1733 {
1734         if (req->status || req->actual != req->length) {
1735                 printk(KERN_ERR "gs_setup_complete: status error, status=%d, actual=%d, length=%d\n",
1736                         req->status, req->actual, req->length);
1737         }
1738 }
1739
1740 /*
1741  * gs_disconnect
1742  *
1743  * Called when the device is disconnected.  Frees the closed
1744  * ports and disconnects open ports.  Open ports will be freed
1745  * on close.  Then reallocates the ports for the next connection.
1746  */
1747 static void gs_disconnect(struct usb_gadget *gadget)
1748 {
1749         unsigned long flags;
1750         struct gs_dev *dev = get_gadget_data(gadget);
1751
1752         spin_lock_irqsave(&dev->dev_lock, flags);
1753
1754         gs_reset_config(dev);
1755
1756         /* free closed ports and disconnect open ports */
1757         /* (open ports will be freed when closed) */
1758         gs_free_ports(dev);
1759
1760         /* re-allocate ports for the next connection */
1761         if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1762                 printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
1763
1764         spin_unlock_irqrestore(&dev->dev_lock, flags);
1765
1766         printk(KERN_INFO "gs_disconnect: %s disconnected\n", GS_LONG_NAME);
1767 }
1768
1769 /*
1770  * gs_set_config
1771  *
1772  * Configures the device by enabling device specific
1773  * optimizations, setting up the endpoints, allocating
1774  * read and write requests and queuing read requests.
1775  *
1776  * The device lock must be held when calling this function.
1777  */
1778 static int gs_set_config(struct gs_dev *dev, unsigned config)
1779 {
1780         int i;
1781         int ret = 0;
1782         struct usb_gadget *gadget = dev->dev_gadget;
1783         struct usb_ep *ep;
1784         struct usb_endpoint_descriptor *ep_desc;
1785         struct usb_request *req;
1786         struct gs_req_entry *req_entry;
1787
1788         if (dev == NULL) {
1789                 printk(KERN_ERR "gs_set_config: NULL device pointer\n");
1790                 return 0;
1791         }
1792
1793         if (config == dev->dev_config)
1794                 return 0;
1795
1796         gs_reset_config(dev);
1797
1798         switch (config) {
1799         case GS_NO_CONFIG_ID:
1800                 return 0;
1801         case GS_BULK_CONFIG_ID:
1802                 if (use_acm)
1803                         return -EINVAL;
1804                 /* device specific optimizations */
1805                 if (gadget_is_net2280(gadget))
1806                         net2280_set_fifo_mode(gadget, 1);
1807                 break;
1808         case GS_ACM_CONFIG_ID:
1809                 if (!use_acm)
1810                         return -EINVAL;
1811                 /* device specific optimizations */
1812                 if (gadget_is_net2280(gadget))
1813                         net2280_set_fifo_mode(gadget, 1);
1814                 break;
1815         default:
1816                 return -EINVAL;
1817         }
1818
1819         dev->dev_config = config;
1820
1821         gadget_for_each_ep(ep, gadget) {
1822
1823                 if (EP_NOTIFY_NAME
1824                 && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
1825                         ep_desc = GS_SPEED_SELECT(
1826                                 gadget->speed == USB_SPEED_HIGH,
1827                                 &gs_highspeed_notify_desc,
1828                                 &gs_fullspeed_notify_desc);
1829                         ret = usb_ep_enable(ep,ep_desc);
1830                         if (ret == 0) {
1831                                 ep->driver_data = dev;
1832                                 dev->dev_notify_ep = ep;
1833                                 dev->dev_notify_ep_desc = ep_desc;
1834                         } else {
1835                                 printk(KERN_ERR "gs_set_config: cannot enable notify endpoint %s, ret=%d\n",
1836                                         ep->name, ret);
1837                                 goto exit_reset_config;
1838                         }
1839                 }
1840
1841                 else if (strcmp(ep->name, EP_IN_NAME) == 0) {
1842                         ep_desc = GS_SPEED_SELECT(
1843                                 gadget->speed == USB_SPEED_HIGH,
1844                                 &gs_highspeed_in_desc,
1845                                 &gs_fullspeed_in_desc);
1846                         ret = usb_ep_enable(ep,ep_desc);
1847                         if (ret == 0) {
1848                                 ep->driver_data = dev;
1849                                 dev->dev_in_ep = ep;
1850                                 dev->dev_in_ep_desc = ep_desc;
1851                         } else {
1852                                 printk(KERN_ERR "gs_set_config: cannot enable in endpoint %s, ret=%d\n",
1853                                         ep->name, ret);
1854                                 goto exit_reset_config;
1855                         }
1856                 }
1857
1858                 else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
1859                         ep_desc = GS_SPEED_SELECT(
1860                                 gadget->speed == USB_SPEED_HIGH,
1861                                 &gs_highspeed_out_desc,
1862                                 &gs_fullspeed_out_desc);
1863                         ret = usb_ep_enable(ep,ep_desc);
1864                         if (ret == 0) {
1865                                 ep->driver_data = dev;
1866                                 dev->dev_out_ep = ep;
1867                                 dev->dev_out_ep_desc = ep_desc;
1868                         } else {
1869                                 printk(KERN_ERR "gs_set_config: cannot enable out endpoint %s, ret=%d\n",
1870                                         ep->name, ret);
1871                                 goto exit_reset_config;
1872                         }
1873                 }
1874
1875         }
1876
1877         if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
1878         || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
1879                 printk(KERN_ERR "gs_set_config: cannot find endpoints\n");
1880                 ret = -ENODEV;
1881                 goto exit_reset_config;
1882         }
1883
1884         /* allocate and queue read requests */
1885         ep = dev->dev_out_ep;
1886         for (i=0; i<read_q_size && ret == 0; i++) {
1887                 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1888                         req->complete = gs_read_complete;
1889                         if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1890                                 printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
1891                                         ret);
1892                         }
1893                 } else {
1894                         printk(KERN_ERR "gs_set_config: cannot allocate read requests\n");
1895                         ret = -ENOMEM;
1896                         goto exit_reset_config;
1897                 }
1898         }
1899
1900         /* allocate write requests, and put on free list */
1901         ep = dev->dev_in_ep;
1902         for (i=0; i<write_q_size; i++) {
1903                 if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
1904                         req_entry->re_req->complete = gs_write_complete;
1905                         list_add(&req_entry->re_entry, &dev->dev_req_list);
1906                 } else {
1907                         printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
1908                         ret = -ENOMEM;
1909                         goto exit_reset_config;
1910                 }
1911         }
1912
1913         printk(KERN_INFO "gs_set_config: %s configured, %s speed %s config\n",
1914                 GS_LONG_NAME,
1915                 gadget->speed == USB_SPEED_HIGH ? "high" : "full",
1916                 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
1917
1918         return 0;
1919
1920 exit_reset_config:
1921         gs_reset_config(dev);
1922         return ret;
1923 }
1924
1925 /*
1926  * gs_reset_config
1927  *
1928  * Mark the device as not configured, disable all endpoints,
1929  * which forces completion of pending I/O and frees queued
1930  * requests, and free the remaining write requests on the
1931  * free list.
1932  *
1933  * The device lock must be held when calling this function.
1934  */
1935 static void gs_reset_config(struct gs_dev *dev)
1936 {
1937         struct gs_req_entry *req_entry;
1938
1939         if (dev == NULL) {
1940                 printk(KERN_ERR "gs_reset_config: NULL device pointer\n");
1941                 return;
1942         }
1943
1944         if (dev->dev_config == GS_NO_CONFIG_ID)
1945                 return;
1946
1947         dev->dev_config = GS_NO_CONFIG_ID;
1948
1949         /* free write requests on the free list */
1950         while(!list_empty(&dev->dev_req_list)) {
1951                 req_entry = list_entry(dev->dev_req_list.next,
1952                         struct gs_req_entry, re_entry);
1953                 list_del(&req_entry->re_entry);
1954                 gs_free_req_entry(dev->dev_in_ep, req_entry);
1955         }
1956
1957         /* disable endpoints, forcing completion of pending i/o; */
1958         /* completion handlers free their requests in this case */
1959         if (dev->dev_notify_ep) {
1960                 usb_ep_disable(dev->dev_notify_ep);
1961                 dev->dev_notify_ep = NULL;
1962         }
1963         if (dev->dev_in_ep) {
1964                 usb_ep_disable(dev->dev_in_ep);
1965                 dev->dev_in_ep = NULL;
1966         }
1967         if (dev->dev_out_ep) {
1968                 usb_ep_disable(dev->dev_out_ep);
1969                 dev->dev_out_ep = NULL;
1970         }
1971 }
1972
1973 /*
1974  * gs_build_config_buf
1975  *
1976  * Builds the config descriptors in the given buffer and returns the
1977  * length, or a negative error number.
1978  */
1979 static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
1980         u8 type, unsigned int index, int is_otg)
1981 {
1982         int len;
1983         int high_speed;
1984         const struct usb_config_descriptor *config_desc;
1985         const struct usb_descriptor_header **function;
1986
1987         if (index >= gs_device_desc.bNumConfigurations)
1988                 return -EINVAL;
1989
1990         /* other speed switches high and full speed */
1991         high_speed = (speed == USB_SPEED_HIGH);
1992         if (type == USB_DT_OTHER_SPEED_CONFIG)
1993                 high_speed = !high_speed;
1994
1995         if (use_acm) {
1996                 config_desc = &gs_acm_config_desc;
1997                 function = GS_SPEED_SELECT(high_speed,
1998                         gs_acm_highspeed_function,
1999                         gs_acm_fullspeed_function);
2000         } else {
2001                 config_desc = &gs_bulk_config_desc;
2002                 function = GS_SPEED_SELECT(high_speed,
2003                         gs_bulk_highspeed_function,
2004                         gs_bulk_fullspeed_function);
2005         }
2006
2007         /* for now, don't advertise srp-only devices */
2008         if (!is_otg)
2009                 function++;
2010
2011         len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
2012         if (len < 0)
2013                 return len;
2014
2015         ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
2016
2017         return len;
2018 }
2019
2020 /*
2021  * gs_alloc_req
2022  *
2023  * Allocate a usb_request and its buffer.  Returns a pointer to the
2024  * usb_request or NULL if there is an error.
2025  */
2026 static struct usb_request *
2027 gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags)
2028 {
2029         struct usb_request *req;
2030
2031         if (ep == NULL)
2032                 return NULL;
2033
2034         req = usb_ep_alloc_request(ep, kmalloc_flags);
2035
2036         if (req != NULL) {
2037                 req->length = len;
2038                 req->buf = kmalloc(len, kmalloc_flags);
2039                 if (req->buf == NULL) {
2040                         usb_ep_free_request(ep, req);
2041                         return NULL;
2042                 }
2043         }
2044
2045         return req;
2046 }
2047
2048 /*
2049  * gs_free_req
2050  *
2051  * Free a usb_request and its buffer.
2052  */
2053 static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
2054 {
2055         if (ep != NULL && req != NULL) {
2056                 kfree(req->buf);
2057                 usb_ep_free_request(ep, req);
2058         }
2059 }
2060
2061 /*
2062  * gs_alloc_req_entry
2063  *
2064  * Allocates a request and its buffer, using the given
2065  * endpoint, buffer len, and kmalloc flags.
2066  */
2067 static struct gs_req_entry *
2068 gs_alloc_req_entry(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
2069 {
2070         struct gs_req_entry     *req;
2071
2072         req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
2073         if (req == NULL)
2074                 return NULL;
2075
2076         req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
2077         if (req->re_req == NULL) {
2078                 kfree(req);
2079                 return NULL;
2080         }
2081
2082         req->re_req->context = req;
2083
2084         return req;
2085 }
2086
2087 /*
2088  * gs_free_req_entry
2089  *
2090  * Frees a request and its buffer.
2091  */
2092 static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
2093 {
2094         if (ep != NULL && req != NULL) {
2095                 if (req->re_req != NULL)
2096                         gs_free_req(ep, req->re_req);
2097                 kfree(req);
2098         }
2099 }
2100
2101 /*
2102  * gs_alloc_ports
2103  *
2104  * Allocate all ports and set the gs_dev struct to point to them.
2105  * Return 0 if successful, or a negative error number.
2106  *
2107  * The device lock is normally held when calling this function.
2108  */
2109 static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
2110 {
2111         int i;
2112         struct gs_port *port;
2113
2114         if (dev == NULL)
2115                 return -EIO;
2116
2117         for (i=0; i<GS_NUM_PORTS; i++) {
2118                 if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
2119                         return -ENOMEM;
2120
2121                 port->port_dev = dev;
2122                 port->port_num = i;
2123                 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
2124                 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
2125                 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
2126                 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
2127                 spin_lock_init(&port->port_lock);
2128                 init_waitqueue_head(&port->port_write_wait);
2129
2130                 dev->dev_port[i] = port;
2131         }
2132
2133         return 0;
2134 }
2135
2136 /*
2137  * gs_free_ports
2138  *
2139  * Free all closed ports.  Open ports are disconnected by
2140  * freeing their write buffers, setting their device pointers
2141  * and the pointers to them in the device to NULL.  These
2142  * ports will be freed when closed.
2143  *
2144  * The device lock is normally held when calling this function.
2145  */
2146 static void gs_free_ports(struct gs_dev *dev)
2147 {
2148         int i;
2149         unsigned long flags;
2150         struct gs_port *port;
2151
2152         if (dev == NULL)
2153                 return;
2154
2155         for (i=0; i<GS_NUM_PORTS; i++) {
2156                 if ((port=dev->dev_port[i]) != NULL) {
2157                         dev->dev_port[i] = NULL;
2158
2159                         spin_lock_irqsave(&port->port_lock, flags);
2160
2161                         if (port->port_write_buf != NULL) {
2162                                 gs_buf_free(port->port_write_buf);
2163                                 port->port_write_buf = NULL;
2164                         }
2165
2166                         if (port->port_open_count > 0 || port->port_in_use) {
2167                                 port->port_dev = NULL;
2168                                 wake_up_interruptible(&port->port_write_wait);
2169                                 if (port->port_tty) {
2170                                         wake_up_interruptible(&port->port_tty->read_wait);
2171                                         wake_up_interruptible(&port->port_tty->write_wait);
2172                                 }
2173                                 spin_unlock_irqrestore(&port->port_lock, flags);
2174                         } else {
2175                                 spin_unlock_irqrestore(&port->port_lock, flags);
2176                                 kfree(port);
2177                         }
2178
2179                 }
2180         }
2181 }
2182
2183 /* Circular Buffer */
2184
2185 /*
2186  * gs_buf_alloc
2187  *
2188  * Allocate a circular buffer and all associated memory.
2189  */
2190 static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
2191 {
2192         struct gs_buf *gb;
2193
2194         if (size == 0)
2195                 return NULL;
2196
2197         gb = kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2198         if (gb == NULL)
2199                 return NULL;
2200
2201         gb->buf_buf = kmalloc(size, kmalloc_flags);
2202         if (gb->buf_buf == NULL) {
2203                 kfree(gb);
2204                 return NULL;
2205         }
2206
2207         gb->buf_size = size;
2208         gb->buf_get = gb->buf_put = gb->buf_buf;
2209
2210         return gb;
2211 }
2212
2213 /*
2214  * gs_buf_free
2215  *
2216  * Free the buffer and all associated memory.
2217  */
2218 static void gs_buf_free(struct gs_buf *gb)
2219 {
2220         if (gb) {
2221                 kfree(gb->buf_buf);
2222                 kfree(gb);
2223         }
2224 }
2225
2226 /*
2227  * gs_buf_clear
2228  *
2229  * Clear out all data in the circular buffer.
2230  */
2231 static void gs_buf_clear(struct gs_buf *gb)
2232 {
2233         if (gb != NULL)
2234                 gb->buf_get = gb->buf_put;
2235                 /* equivalent to a get of all data available */
2236 }
2237
2238 /*
2239  * gs_buf_data_avail
2240  *
2241  * Return the number of bytes of data available in the circular
2242  * buffer.
2243  */
2244 static unsigned int gs_buf_data_avail(struct gs_buf *gb)
2245 {
2246         if (gb != NULL)
2247                 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2248         else
2249                 return 0;
2250 }
2251
2252 /*
2253  * gs_buf_space_avail
2254  *
2255  * Return the number of bytes of space available in the circular
2256  * buffer.
2257  */
2258 static unsigned int gs_buf_space_avail(struct gs_buf *gb)
2259 {
2260         if (gb != NULL)
2261                 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2262         else
2263                 return 0;
2264 }
2265
2266 /*
2267  * gs_buf_put
2268  *
2269  * Copy data data from a user buffer and put it into the circular buffer.
2270  * Restrict to the amount of space available.
2271  *
2272  * Return the number of bytes copied.
2273  */
2274 static unsigned int
2275 gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2276 {
2277         unsigned int len;
2278
2279         if (gb == NULL)
2280                 return 0;
2281
2282         len  = gs_buf_space_avail(gb);
2283         if (count > len)
2284                 count = len;
2285
2286         if (count == 0)
2287                 return 0;
2288
2289         len = gb->buf_buf + gb->buf_size - gb->buf_put;
2290         if (count > len) {
2291                 memcpy(gb->buf_put, buf, len);
2292                 memcpy(gb->buf_buf, buf+len, count - len);
2293                 gb->buf_put = gb->buf_buf + count - len;
2294         } else {
2295                 memcpy(gb->buf_put, buf, count);
2296                 if (count < len)
2297                         gb->buf_put += count;
2298                 else /* count == len */
2299                         gb->buf_put = gb->buf_buf;
2300         }
2301
2302         return count;
2303 }
2304
2305 /*
2306  * gs_buf_get
2307  *
2308  * Get data from the circular buffer and copy to the given buffer.
2309  * Restrict to the amount of data available.
2310  *
2311  * Return the number of bytes copied.
2312  */
2313 static unsigned int
2314 gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2315 {
2316         unsigned int len;
2317
2318         if (gb == NULL)
2319                 return 0;
2320
2321         len = gs_buf_data_avail(gb);
2322         if (count > len)
2323                 count = len;
2324
2325         if (count == 0)
2326                 return 0;
2327
2328         len = gb->buf_buf + gb->buf_size - gb->buf_get;
2329         if (count > len) {
2330                 memcpy(buf, gb->buf_get, len);
2331                 memcpy(buf+len, gb->buf_buf, count - len);
2332                 gb->buf_get = gb->buf_buf + count - len;
2333         } else {
2334                 memcpy(buf, gb->buf_get, count);
2335                 if (count < len)
2336                         gb->buf_get += count;
2337                 else /* count == len */
2338                         gb->buf_get = gb->buf_buf;
2339         }
2340
2341         return count;
2342 }