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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-06-19 20:52:07 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-21 18:15:59 -0400
commita7707adf9ee8de3c5b67e3793b98888f551ad00d (patch)
tree431137e4c39202f6395f64893966e3bdfa1349d2 /drivers/usb/gadget/serial.c
parentc1dca562be8ada614ef193aa246c6f8705bcd6b9 (diff)
usb gadget: use new serial core
Teach "gadget serial" to use the new abstracted (and bugfixed) TTY glue, and remove all the orignal tangled-up code. Update the documentation accordingly. This is a net object code shrink and cleanup; it should make it a lot easier to see how the TTY glue should accomodate updates to the TTY layer, be bugfixed, etc. Notable behavior changes include: it can now support getty even when there's no USB connection; it fits properly into the mdev/udev world; and RX handling is better (throttling works, and low latency). Configurations with scripts setting up the /dev/ttygserial device node (with "experimental" major number) may want to change that to be a symlink pointing to the /dev/ttyGS0 file, as a migration aid; else, just switch entirely over to mdev/udev. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/serial.c')
-rw-r--r--drivers/usb/gadget/serial.c1392
1 files changed, 76 insertions, 1316 deletions
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index fa019fa73334..64ce7e00e98a 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -1,15 +1,8 @@
1/* 1/*
2 * g_serial.c -- USB gadget serial driver 2 * serial.c -- USB gadget serial driver
3 * 3 *
4 * Copyright 2003 (C) Al Borchers (alborchers@steinerpoint.com) 4 * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
5 * 5 * Copyright (C) 2008 by David Brownell
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 * 6 *
14 * This software is distributed under the terms of the GNU General 7 * This software is distributed under the terms of the GNU General
15 * Public License ("GPL") as published by the Free Software Foundation, 8 * Public License ("GPL") as published by the Free Software Foundation,
@@ -22,23 +15,20 @@
22#include <linux/tty.h> 15#include <linux/tty.h>
23#include <linux/tty_flip.h> 16#include <linux/tty_flip.h>
24 17
25#include <linux/usb/ch9.h> 18#include "u_serial.h"
26#include <linux/usb/cdc.h>
27#include <linux/usb/gadget.h>
28
29#include "gadget_chips.h" 19#include "gadget_chips.h"
30 20
31 21
32/* Defines */ 22/* Defines */
33 23
34#define GS_VERSION_STR "v2.2" 24#define GS_VERSION_STR "v2.3"
35#define GS_VERSION_NUM 0x2200 25#define GS_VERSION_NUM 0x2300
36 26
37#define GS_LONG_NAME "Gadget Serial" 27#define GS_LONG_NAME "Gadget Serial"
38#define GS_SHORT_NAME "g_serial" 28#define GS_SHORT_NAME "g_serial"
39 29
40#define GS_MAJOR 127 30#define GS_VERSION_NAME GS_LONG_NAME " " GS_VERSION_STR
41#define GS_MINOR_START 0 31
42 32
43/* REVISIT only one port is supported for now; 33/* REVISIT only one port is supported for now;
44 * see gs_{send,recv}_packet() ... no multiplexing, 34 * see gs_{send,recv}_packet() ... no multiplexing,
@@ -58,23 +48,8 @@
58 48
59#define GS_MAX_DESC_LEN 256 49#define GS_MAX_DESC_LEN 256
60 50
61#define GS_DEFAULT_READ_Q_SIZE 32
62#define GS_DEFAULT_WRITE_Q_SIZE 32
63
64#define GS_DEFAULT_WRITE_BUF_SIZE 8192
65#define GS_TMP_BUF_SIZE 8192
66
67#define GS_CLOSE_TIMEOUT 15
68
69#define GS_DEFAULT_USE_ACM 0 51#define GS_DEFAULT_USE_ACM 0
70 52
71/* 9600-8-N-1 ... matches init_termios.c_cflag and defaults
72 * expected by "usbser.sys" on MS-Windows.
73 */
74#define GS_DEFAULT_DTE_RATE 9600
75#define GS_DEFAULT_DATA_BITS 8
76#define GS_DEFAULT_PARITY USB_CDC_NO_PARITY
77#define GS_DEFAULT_CHAR_FORMAT USB_CDC_1_STOP_BITS
78 53
79/* maxpacket and other transfer characteristics vary by speed. */ 54/* maxpacket and other transfer characteristics vary by speed. */
80static inline struct usb_endpoint_descriptor * 55static inline struct usb_endpoint_descriptor *
@@ -87,19 +62,6 @@ choose_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
87} 62}
88 63
89 64
90/* debug settings */
91#ifdef DEBUG
92static int debug = 1;
93#else
94#define debug 0
95#endif
96
97#define gs_debug(format, arg...) \
98 do { if (debug) pr_debug(format, ## arg); } while (0)
99#define gs_debug_level(level, format, arg...) \
100 do { if (debug >= level) pr_debug(format, ## arg); } while (0)
101
102
103/* Thanks to NetChip Technologies for donating this product ID. 65/* Thanks to NetChip Technologies for donating this product ID.
104 * 66 *
105 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! 67 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
@@ -112,63 +74,19 @@ static int debug = 1;
112#define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */ 74#define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
113#define GS_NOTIFY_MAXPACKET 8 75#define GS_NOTIFY_MAXPACKET 8
114 76
115
116/* circular buffer */
117struct gs_buf {
118 unsigned int buf_size;
119 char *buf_buf;
120 char *buf_get;
121 char *buf_put;
122};
123
124/* the port structure holds info for each port, one for each minor number */
125struct gs_port {
126 struct gs_dev *port_dev; /* pointer to device struct */
127 struct tty_struct *port_tty; /* pointer to tty struct */
128 spinlock_t port_lock;
129 int port_num;
130 int port_open_count;
131 int port_in_use; /* open/close in progress */
132 wait_queue_head_t port_write_wait;/* waiting to write */
133 struct gs_buf *port_write_buf;
134 struct usb_cdc_line_coding port_line_coding; /* 8-N-1 etc */
135 u16 port_handshake_bits;
136#define RS232_RTS (1 << 1)
137#define RS232_DTE (1 << 0)
138};
139
140/* the device structure holds info for the USB device */ 77/* the device structure holds info for the USB device */
141struct gs_dev { 78struct gs_dev {
142 struct usb_gadget *dev_gadget; /* gadget device pointer */ 79 struct usb_gadget *dev_gadget; /* gadget device pointer */
143 spinlock_t dev_lock; /* lock for set/reset config */ 80 spinlock_t dev_lock; /* lock for set/reset config */
144 int dev_config; /* configuration number */ 81 int dev_config; /* configuration number */
145 struct usb_ep *dev_notify_ep; /* address of notify endpoint */
146 struct usb_ep *dev_in_ep; /* address of in endpoint */
147 struct usb_ep *dev_out_ep; /* address of out endpoint */
148 struct usb_endpoint_descriptor /* descriptor of notify ep */
149 *dev_notify_ep_desc;
150 struct usb_endpoint_descriptor /* descriptor of in endpoint */
151 *dev_in_ep_desc;
152 struct usb_endpoint_descriptor /* descriptor of out endpoint */
153 *dev_out_ep_desc;
154 struct usb_request *dev_ctrl_req; /* control request */ 82 struct usb_request *dev_ctrl_req; /* control request */
155 struct list_head dev_req_list; /* list of write requests */ 83
156 int dev_sched_port; /* round robin port scheduled */ 84 struct gserial gser; /* serial/tty port */
157 struct gs_port *dev_port[GS_NUM_PORTS]; /* the ports */
158}; 85};
159 86
160 87
161/* Functions */ 88/* Functions */
162 89
163/* tty driver internals */
164static int gs_send(struct gs_dev *dev);
165static int gs_send_packet(struct gs_dev *dev, char *packet,
166 unsigned int size);
167static int gs_recv_packet(struct gs_dev *dev, char *packet,
168 unsigned int size);
169static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
170static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
171
172/* gadget driver internals */ 90/* gadget driver internals */
173static int gs_set_config(struct gs_dev *dev, unsigned config); 91static int gs_set_config(struct gs_dev *dev, unsigned config);
174static void gs_reset_config(struct gs_dev *dev); 92static void gs_reset_config(struct gs_dev *dev);
@@ -179,28 +97,6 @@ static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
179 gfp_t kmalloc_flags); 97 gfp_t kmalloc_flags);
180static void gs_free_req(struct usb_ep *ep, struct usb_request *req); 98static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
181 99
182static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
183static void gs_free_ports(struct gs_dev *dev);
184
185/* circular buffer */
186static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
187static void gs_buf_free(struct gs_buf *gb);
188static void gs_buf_clear(struct gs_buf *gb);
189static unsigned int gs_buf_data_avail(struct gs_buf *gb);
190static unsigned int gs_buf_space_avail(struct gs_buf *gb);
191static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
192 unsigned int count);
193static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
194 unsigned int count);
195
196
197/* Globals */
198
199static struct gs_dev *gs_device;
200
201static struct mutex gs_open_close_lock[GS_NUM_PORTS];
202
203
204/*-------------------------------------------------------------------------*/ 100/*-------------------------------------------------------------------------*/
205 101
206/* USB descriptors */ 102/* USB descriptors */
@@ -217,7 +113,7 @@ static struct mutex gs_open_close_lock[GS_NUM_PORTS];
217static char manufacturer[50]; 113static char manufacturer[50];
218static struct usb_string gs_strings[] = { 114static struct usb_string gs_strings[] = {
219 { GS_MANUFACTURER_STR_ID, manufacturer }, 115 { GS_MANUFACTURER_STR_ID, manufacturer },
220 { GS_PRODUCT_STR_ID, GS_LONG_NAME }, 116 { GS_PRODUCT_STR_ID, GS_VERSION_NAME },
221 { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" }, 117 { GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
222 { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" }, 118 { GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
223 { GS_CONTROL_STR_ID, "Gadget Serial Control" }, 119 { GS_CONTROL_STR_ID, "Gadget Serial Control" },
@@ -436,761 +332,17 @@ static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
436/*-------------------------------------------------------------------------*/ 332/*-------------------------------------------------------------------------*/
437 333
438/* Module */ 334/* Module */
439MODULE_DESCRIPTION(GS_LONG_NAME); 335MODULE_DESCRIPTION(GS_VERSION_NAME);
440MODULE_AUTHOR("Al Borchers"); 336MODULE_AUTHOR("Al Borchers");
337MODULE_AUTHOR("David Brownell");
441MODULE_LICENSE("GPL"); 338MODULE_LICENSE("GPL");
442 339
443#ifdef DEBUG
444module_param(debug, int, S_IRUGO|S_IWUSR);
445MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
446#endif
447
448static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
449module_param(read_q_size, uint, S_IRUGO);
450MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
451
452static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
453module_param(write_q_size, uint, S_IRUGO);
454MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
455
456static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
457module_param(write_buf_size, uint, S_IRUGO);
458MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
459
460static unsigned int use_acm = GS_DEFAULT_USE_ACM; 340static unsigned int use_acm = GS_DEFAULT_USE_ACM;
461module_param(use_acm, uint, S_IRUGO); 341module_param(use_acm, uint, S_IRUGO);
462MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no"); 342MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
463 343
464/*-------------------------------------------------------------------------*/ 344/*-------------------------------------------------------------------------*/
465 345
466/* TTY Driver */
467
468/*
469 * gs_open
470 */
471static int gs_open(struct tty_struct *tty, struct file *file)
472{
473 int port_num;
474 unsigned long flags;
475 struct gs_port *port;
476 struct gs_dev *dev;
477 struct gs_buf *buf;
478 struct mutex *mtx;
479 int ret;
480
481 port_num = tty->index;
482
483 gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
484
485 if (port_num < 0 || port_num >= GS_NUM_PORTS) {
486 pr_err("gs_open: (%d,%p,%p) invalid port number\n",
487 port_num, tty, file);
488 return -ENODEV;
489 }
490
491 dev = gs_device;
492
493 if (dev == NULL) {
494 pr_err("gs_open: (%d,%p,%p) NULL device pointer\n",
495 port_num, tty, file);
496 return -ENODEV;
497 }
498
499 mtx = &gs_open_close_lock[port_num];
500 if (mutex_lock_interruptible(mtx)) {
501 pr_err("gs_open: (%d,%p,%p) interrupted waiting for mutex\n",
502 port_num, tty, file);
503 return -ERESTARTSYS;
504 }
505
506 spin_lock_irqsave(&dev->dev_lock, flags);
507
508 if (dev->dev_config == GS_NO_CONFIG_ID) {
509 pr_err("gs_open: (%d,%p,%p) device is not connected\n",
510 port_num, tty, file);
511 ret = -ENODEV;
512 goto exit_unlock_dev;
513 }
514
515 port = dev->dev_port[port_num];
516
517 if (port == NULL) {
518 pr_err("gs_open: (%d,%p,%p) NULL port pointer\n",
519 port_num, tty, file);
520 ret = -ENODEV;
521 goto exit_unlock_dev;
522 }
523
524 spin_lock(&port->port_lock);
525 spin_unlock(&dev->dev_lock);
526
527 if (port->port_dev == NULL) {
528 pr_err("gs_open: (%d,%p,%p) port disconnected (1)\n",
529 port_num, tty, file);
530 ret = -EIO;
531 goto exit_unlock_port;
532 }
533
534 if (port->port_open_count > 0) {
535 ++port->port_open_count;
536 gs_debug("gs_open: (%d,%p,%p) already open\n",
537 port_num, tty, file);
538 ret = 0;
539 goto exit_unlock_port;
540 }
541
542 tty->driver_data = NULL;
543
544 /* mark port as in use, we can drop port lock and sleep if necessary */
545 port->port_in_use = 1;
546
547 /* allocate write buffer on first open */
548 if (port->port_write_buf == NULL) {
549 spin_unlock_irqrestore(&port->port_lock, flags);
550 buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
551 spin_lock_irqsave(&port->port_lock, flags);
552
553 /* might have been disconnected while asleep, check */
554 if (port->port_dev == NULL) {
555 pr_err("gs_open: (%d,%p,%p) port disconnected (2)\n",
556 port_num, tty, file);
557 port->port_in_use = 0;
558 ret = -EIO;
559 goto exit_unlock_port;
560 }
561
562 if ((port->port_write_buf=buf) == NULL) {
563 pr_err("gs_open: (%d,%p,%p) cannot allocate "
564 "port write buffer\n",
565 port_num, tty, file);
566 port->port_in_use = 0;
567 ret = -ENOMEM;
568 goto exit_unlock_port;
569 }
570
571 }
572
573 /* wait for carrier detect (not implemented) */
574
575 /* might have been disconnected while asleep, check */
576 if (port->port_dev == NULL) {
577 pr_err("gs_open: (%d,%p,%p) port disconnected (3)\n",
578 port_num, tty, file);
579 port->port_in_use = 0;
580 ret = -EIO;
581 goto exit_unlock_port;
582 }
583
584 tty->driver_data = port;
585 port->port_tty = tty;
586 port->port_open_count = 1;
587 port->port_in_use = 0;
588
589 gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
590
591 ret = 0;
592
593exit_unlock_port:
594 spin_unlock_irqrestore(&port->port_lock, flags);
595 mutex_unlock(mtx);
596 return ret;
597
598exit_unlock_dev:
599 spin_unlock_irqrestore(&dev->dev_lock, flags);
600 mutex_unlock(mtx);
601 return ret;
602
603}
604
605/*
606 * gs_close
607 */
608
609static int gs_write_finished_event_safely(struct gs_port *p)
610{
611 int cond;
612
613 spin_lock_irq(&(p)->port_lock);
614 cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf);
615 spin_unlock_irq(&(p)->port_lock);
616 return cond;
617}
618
619static void gs_close(struct tty_struct *tty, struct file *file)
620{
621 struct gs_port *port = tty->driver_data;
622 struct mutex *mtx;
623
624 if (port == NULL) {
625 pr_err("gs_close: NULL port pointer\n");
626 return;
627 }
628
629 gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
630
631 mtx = &gs_open_close_lock[port->port_num];
632 mutex_lock(mtx);
633
634 spin_lock_irq(&port->port_lock);
635
636 if (port->port_open_count == 0) {
637 pr_err("gs_close: (%d,%p,%p) port is already closed\n",
638 port->port_num, tty, file);
639 goto exit;
640 }
641
642 if (port->port_open_count > 1) {
643 --port->port_open_count;
644 goto exit;
645 }
646
647 /* free disconnected port on final close */
648 if (port->port_dev == NULL) {
649 kfree(port);
650 goto exit;
651 }
652
653 /* mark port as closed but in use, we can drop port lock */
654 /* and sleep if necessary */
655 port->port_in_use = 1;
656 port->port_open_count = 0;
657
658 /* wait for write buffer to drain, or */
659 /* at most GS_CLOSE_TIMEOUT seconds */
660 if (gs_buf_data_avail(port->port_write_buf) > 0) {
661 spin_unlock_irq(&port->port_lock);
662 wait_event_interruptible_timeout(port->port_write_wait,
663 gs_write_finished_event_safely(port),
664 GS_CLOSE_TIMEOUT * HZ);
665 spin_lock_irq(&port->port_lock);
666 }
667
668 /* free disconnected port on final close */
669 /* (might have happened during the above sleep) */
670 if (port->port_dev == NULL) {
671 kfree(port);
672 goto exit;
673 }
674
675 gs_buf_clear(port->port_write_buf);
676
677 tty->driver_data = NULL;
678 port->port_tty = NULL;
679 port->port_in_use = 0;
680
681 gs_debug("gs_close: (%d,%p,%p) completed\n",
682 port->port_num, tty, file);
683
684exit:
685 spin_unlock_irq(&port->port_lock);
686 mutex_unlock(mtx);
687}
688
689/*
690 * gs_write
691 */
692static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
693{
694 unsigned long flags;
695 struct gs_port *port = tty->driver_data;
696 int ret;
697
698 if (port == NULL) {
699 pr_err("gs_write: NULL port pointer\n");
700 return -EIO;
701 }
702
703 gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
704 count);
705
706 if (count == 0)
707 return 0;
708
709 spin_lock_irqsave(&port->port_lock, flags);
710
711 if (port->port_dev == NULL) {
712 pr_err("gs_write: (%d,%p) port is not connected\n",
713 port->port_num, tty);
714 ret = -EIO;
715 goto exit;
716 }
717
718 if (port->port_open_count == 0) {
719 pr_err("gs_write: (%d,%p) port is closed\n",
720 port->port_num, tty);
721 ret = -EBADF;
722 goto exit;
723 }
724
725 count = gs_buf_put(port->port_write_buf, buf, count);
726
727 spin_unlock_irqrestore(&port->port_lock, flags);
728
729 gs_send(gs_device);
730
731 gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
732 count);
733
734 return count;
735
736exit:
737 spin_unlock_irqrestore(&port->port_lock, flags);
738 return ret;
739}
740
741/*
742 * gs_put_char
743 */
744static int gs_put_char(struct tty_struct *tty, unsigned char ch)
745{
746 unsigned long flags;
747 struct gs_port *port = tty->driver_data;
748 int ret = 0;
749
750 if (port == NULL) {
751 pr_err("gs_put_char: NULL port pointer\n");
752 return 0;
753 }
754
755 gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p\n",
756 port->port_num, tty, ch, __builtin_return_address(0));
757
758 spin_lock_irqsave(&port->port_lock, flags);
759
760 if (port->port_dev == NULL) {
761 pr_err("gs_put_char: (%d,%p) port is not connected\n",
762 port->port_num, tty);
763 goto exit;
764 }
765
766 if (port->port_open_count == 0) {
767 pr_err("gs_put_char: (%d,%p) port is closed\n",
768 port->port_num, tty);
769 goto exit;
770 }
771
772 ret = gs_buf_put(port->port_write_buf, &ch, 1);
773
774exit:
775 spin_unlock_irqrestore(&port->port_lock, flags);
776 return ret;
777}
778
779/*
780 * gs_flush_chars
781 */
782static void gs_flush_chars(struct tty_struct *tty)
783{
784 unsigned long flags;
785 struct gs_port *port = tty->driver_data;
786
787 if (port == NULL) {
788 pr_err("gs_flush_chars: NULL port pointer\n");
789 return;
790 }
791
792 gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
793
794 spin_lock_irqsave(&port->port_lock, flags);
795
796 if (port->port_dev == NULL) {
797 pr_err("gs_flush_chars: (%d,%p) port is not connected\n",
798 port->port_num, tty);
799 goto exit;
800 }
801
802 if (port->port_open_count == 0) {
803 pr_err("gs_flush_chars: (%d,%p) port is closed\n",
804 port->port_num, tty);
805 goto exit;
806 }
807
808 spin_unlock_irqrestore(&port->port_lock, flags);
809
810 gs_send(gs_device);
811
812 return;
813
814exit:
815 spin_unlock_irqrestore(&port->port_lock, flags);
816}
817
818/*
819 * gs_write_room
820 */
821static int gs_write_room(struct tty_struct *tty)
822{
823
824 int room = 0;
825 unsigned long flags;
826 struct gs_port *port = tty->driver_data;
827
828
829 if (port == NULL)
830 return 0;
831
832 spin_lock_irqsave(&port->port_lock, flags);
833
834 if (port->port_dev != NULL && port->port_open_count > 0
835 && port->port_write_buf != NULL)
836 room = gs_buf_space_avail(port->port_write_buf);
837
838 spin_unlock_irqrestore(&port->port_lock, flags);
839
840 gs_debug("gs_write_room: (%d,%p) room=%d\n",
841 port->port_num, tty, room);
842
843 return room;
844}
845
846/*
847 * gs_chars_in_buffer
848 */
849static int gs_chars_in_buffer(struct tty_struct *tty)
850{
851 int chars = 0;
852 unsigned long flags;
853 struct gs_port *port = tty->driver_data;
854
855 if (port == NULL)
856 return 0;
857
858 spin_lock_irqsave(&port->port_lock, flags);
859
860 if (port->port_dev != NULL && port->port_open_count > 0
861 && port->port_write_buf != NULL)
862 chars = gs_buf_data_avail(port->port_write_buf);
863
864 spin_unlock_irqrestore(&port->port_lock, flags);
865
866 gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
867 port->port_num, tty, chars);
868
869 return chars;
870}
871
872/*
873 * gs_throttle
874 */
875static void gs_throttle(struct tty_struct *tty)
876{
877}
878
879/*
880 * gs_unthrottle
881 */
882static void gs_unthrottle(struct tty_struct *tty)
883{
884}
885
886/*
887 * gs_break
888 */
889static void gs_break(struct tty_struct *tty, int break_state)
890{
891}
892
893/*
894 * gs_ioctl
895 */
896static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
897{
898 struct gs_port *port = tty->driver_data;
899
900 if (port == NULL) {
901 pr_err("gs_ioctl: NULL port pointer\n");
902 return -EIO;
903 }
904
905 gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
906 port->port_num, tty, file, cmd, arg);
907
908 /* handle ioctls */
909
910 /* could not handle ioctl */
911 return -ENOIOCTLCMD;
912}
913
914/*
915 * gs_set_termios
916 */
917static void gs_set_termios(struct tty_struct *tty, struct ktermios *old)
918{
919}
920
921static const struct tty_operations gs_tty_ops = {
922 .open = gs_open,
923 .close = gs_close,
924 .write = gs_write,
925 .put_char = gs_put_char,
926 .flush_chars = gs_flush_chars,
927 .write_room = gs_write_room,
928 .ioctl = gs_ioctl,
929 .set_termios = gs_set_termios,
930 .throttle = gs_throttle,
931 .unthrottle = gs_unthrottle,
932 .break_ctl = gs_break,
933 .chars_in_buffer = gs_chars_in_buffer,
934};
935
936/*-------------------------------------------------------------------------*/
937
938/*
939* gs_send
940*
941* This function finds available write requests, calls
942* gs_send_packet to fill these packets with data, and
943* continues until either there are no more write requests
944* available or no more data to send. This function is
945* run whenever data arrives or write requests are available.
946*/
947static int gs_send(struct gs_dev *dev)
948{
949 int ret,len;
950 unsigned long flags;
951 struct usb_ep *ep;
952 struct usb_request *req;
953
954 if (dev == NULL) {
955 pr_err("gs_send: NULL device pointer\n");
956 return -ENODEV;
957 }
958
959 spin_lock_irqsave(&dev->dev_lock, flags);
960
961 ep = dev->dev_in_ep;
962
963 while(!list_empty(&dev->dev_req_list)) {
964
965 req = list_entry(dev->dev_req_list.next,
966 struct usb_request, list);
967
968 len = gs_send_packet(dev, req->buf, ep->maxpacket);
969
970 if (len > 0) {
971 gs_debug_level(3, "gs_send: len=%d, 0x%2.2x "
972 "0x%2.2x 0x%2.2x ...\n", len,
973 *((unsigned char *)req->buf),
974 *((unsigned char *)req->buf+1),
975 *((unsigned char *)req->buf+2));
976 list_del(&req->list);
977 req->length = len;
978 spin_unlock_irqrestore(&dev->dev_lock, flags);
979 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
980 pr_err(
981 "gs_send: cannot queue read request, ret=%d\n",
982 ret);
983 spin_lock_irqsave(&dev->dev_lock, flags);
984 break;
985 }
986 spin_lock_irqsave(&dev->dev_lock, flags);
987 } else {
988 break;
989 }
990
991 }
992
993 spin_unlock_irqrestore(&dev->dev_lock, flags);
994
995 return 0;
996}
997
998/*
999 * gs_send_packet
1000 *
1001 * If there is data to send, a packet is built in the given
1002 * buffer and the size is returned. If there is no data to
1003 * send, 0 is returned. If there is any error a negative
1004 * error number is returned.
1005 *
1006 * Called during USB completion routine, on interrupt time.
1007 *
1008 * We assume that disconnect will not happen until all completion
1009 * routines have completed, so we can assume that the dev_port
1010 * array does not change during the lifetime of this function.
1011 */
1012static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
1013{
1014 unsigned int len;
1015 struct gs_port *port;
1016
1017 /* TEMPORARY -- only port 0 is supported right now */
1018 port = dev->dev_port[0];
1019
1020 if (port == NULL) {
1021 pr_err("gs_send_packet: port=%d, NULL port pointer\n", 0);
1022 return -EIO;
1023 }
1024
1025 spin_lock(&port->port_lock);
1026
1027 len = gs_buf_data_avail(port->port_write_buf);
1028 if (len < size)
1029 size = len;
1030
1031 if (size == 0)
1032 goto exit;
1033
1034 size = gs_buf_get(port->port_write_buf, packet, size);
1035
1036 if (port->port_tty)
1037 wake_up_interruptible(&port->port_tty->write_wait);
1038
1039exit:
1040 spin_unlock(&port->port_lock);
1041 return size;
1042}
1043
1044/*
1045 * gs_recv_packet
1046 *
1047 * Called for each USB packet received. Reads the packet
1048 * header and stuffs the data in the appropriate tty buffer.
1049 * Returns 0 if successful, or a negative error number.
1050 *
1051 * Called during USB completion routine, on interrupt time.
1052 *
1053 * We assume that disconnect will not happen until all completion
1054 * routines have completed, so we can assume that the dev_port
1055 * array does not change during the lifetime of this function.
1056 */
1057static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
1058{
1059 unsigned int len;
1060 struct gs_port *port;
1061 int ret;
1062 struct tty_struct *tty;
1063
1064 /* TEMPORARY -- only port 0 is supported right now */
1065 port = dev->dev_port[0];
1066
1067 if (port == NULL) {
1068 pr_err("gs_recv_packet: port=%d, NULL port pointer\n",
1069 port->port_num);
1070 return -EIO;
1071 }
1072
1073 spin_lock(&port->port_lock);
1074
1075 if (port->port_open_count == 0) {
1076 pr_err("gs_recv_packet: port=%d, port is closed\n",
1077 port->port_num);
1078 ret = -EIO;
1079 goto exit;
1080 }
1081
1082
1083 tty = port->port_tty;
1084
1085 if (tty == NULL) {
1086 pr_err("gs_recv_packet: port=%d, NULL tty pointer\n",
1087 port->port_num);
1088 ret = -EIO;
1089 goto exit;
1090 }
1091
1092 if (port->port_tty->magic != TTY_MAGIC) {
1093 pr_err("gs_recv_packet: port=%d, bad tty magic\n",
1094 port->port_num);
1095 ret = -EIO;
1096 goto exit;
1097 }
1098
1099 len = tty_buffer_request_room(tty, size);
1100 if (len > 0) {
1101 tty_insert_flip_string(tty, packet, len);
1102 tty_flip_buffer_push(port->port_tty);
1103 wake_up_interruptible(&port->port_tty->read_wait);
1104 }
1105 ret = 0;
1106exit:
1107 spin_unlock(&port->port_lock);
1108 return ret;
1109}
1110
1111/*
1112* gs_read_complete
1113*/
1114static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
1115{
1116 int ret;
1117 struct gs_dev *dev = ep->driver_data;
1118
1119 if (dev == NULL) {
1120 pr_err("gs_read_complete: NULL device pointer\n");
1121 return;
1122 }
1123
1124 switch(req->status) {
1125 case 0:
1126 /* normal completion */
1127 gs_recv_packet(dev, req->buf, req->actual);
1128requeue:
1129 req->length = ep->maxpacket;
1130 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1131 pr_err(
1132 "gs_read_complete: cannot queue read request, ret=%d\n",
1133 ret);
1134 }
1135 break;
1136
1137 case -ESHUTDOWN:
1138 /* disconnect */
1139 gs_debug("gs_read_complete: shutdown\n");
1140 gs_free_req(ep, req);
1141 break;
1142
1143 default:
1144 /* unexpected */
1145 pr_err(
1146 "gs_read_complete: unexpected status error, status=%d\n",
1147 req->status);
1148 goto requeue;
1149 break;
1150 }
1151}
1152
1153/*
1154* gs_write_complete
1155*/
1156static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
1157{
1158 struct gs_dev *dev = ep->driver_data;
1159
1160 if (dev == NULL) {
1161 pr_err("gs_write_complete: NULL device pointer\n");
1162 return;
1163 }
1164
1165 switch(req->status) {
1166 case 0:
1167 /* normal completion */
1168requeue:
1169 spin_lock(&dev->dev_lock);
1170 list_add(&req->list, &dev->dev_req_list);
1171 spin_unlock(&dev->dev_lock);
1172
1173 gs_send(dev);
1174
1175 break;
1176
1177 case -ESHUTDOWN:
1178 /* disconnect */
1179 gs_debug("gs_write_complete: shutdown\n");
1180 gs_free_req(ep, req);
1181 break;
1182
1183 default:
1184 pr_err(
1185 "gs_write_complete: unexpected status error, status=%d\n",
1186 req->status);
1187 goto requeue;
1188 break;
1189 }
1190}
1191
1192/*-------------------------------------------------------------------------*/
1193
1194/* Gadget Driver */ 346/* Gadget Driver */
1195 347
1196/* 348/*
@@ -1199,12 +351,10 @@ requeue:
1199 * Called on module unload. Frees the control request and device 351 * Called on module unload. Frees the control request and device
1200 * structure. 352 * structure.
1201 */ 353 */
1202static void /* __init_or_exit */ gs_unbind(struct usb_gadget *gadget) 354static void __exit gs_unbind(struct usb_gadget *gadget)
1203{ 355{
1204 struct gs_dev *dev = get_gadget_data(gadget); 356 struct gs_dev *dev = get_gadget_data(gadget);
1205 357
1206 gs_device = NULL;
1207
1208 /* read/write requests already freed, only control request remains */ 358 /* read/write requests already freed, only control request remains */
1209 if (dev != NULL) { 359 if (dev != NULL) {
1210 if (dev->dev_ctrl_req != NULL) { 360 if (dev->dev_ctrl_req != NULL) {
@@ -1212,13 +362,13 @@ static void /* __init_or_exit */ gs_unbind(struct usb_gadget *gadget)
1212 dev->dev_ctrl_req = NULL; 362 dev->dev_ctrl_req = NULL;
1213 } 363 }
1214 gs_reset_config(dev); 364 gs_reset_config(dev);
1215 gs_free_ports(dev);
1216 kfree(dev); 365 kfree(dev);
1217 set_gadget_data(gadget, NULL); 366 set_gadget_data(gadget, NULL);
1218 } 367 }
1219 368
1220 pr_info("gs_unbind: %s %s unbound\n", GS_LONG_NAME, 369 pr_info("gs_unbind: %s unbound\n", GS_VERSION_NAME);
1221 GS_VERSION_STR); 370
371 gserial_cleanup();
1222} 372}
1223 373
1224/* 374/*
@@ -1234,6 +384,10 @@ static int __init gs_bind(struct usb_gadget *gadget)
1234 struct gs_dev *dev; 384 struct gs_dev *dev;
1235 int gcnum; 385 int gcnum;
1236 386
387 ret = gserial_setup(gadget, GS_NUM_PORTS);
388 if (ret < 0)
389 return ret;
390
1237 /* Some controllers can't support CDC ACM: 391 /* Some controllers can't support CDC ACM:
1238 * - sh doesn't support multiple interfaces or configs; 392 * - sh doesn't support multiple interfaces or configs;
1239 * - sa1100 doesn't have a third interrupt endpoint 393 * - sa1100 doesn't have a third interrupt endpoint
@@ -1254,21 +408,24 @@ static int __init gs_bind(struct usb_gadget *gadget)
1254 } 408 }
1255 409
1256 dev = kzalloc(sizeof(struct gs_dev), GFP_KERNEL); 410 dev = kzalloc(sizeof(struct gs_dev), GFP_KERNEL);
1257 if (dev == NULL) 411 if (dev == NULL) {
1258 return -ENOMEM; 412 ret = -ENOMEM;
413 goto autoconf_fail;
414 }
1259 415
1260 usb_ep_autoconfig_reset(gadget); 416 usb_ep_autoconfig_reset(gadget);
417 ret = -ENXIO;
1261 418
1262 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc); 419 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
1263 if (!ep) 420 if (!ep)
1264 goto autoconf_fail; 421 goto autoconf_fail;
1265 dev->dev_in_ep = ep; 422 dev->gser.in = ep;
1266 ep->driver_data = dev; /* claim the endpoint */ 423 ep->driver_data = dev; /* claim the endpoint */
1267 424
1268 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc); 425 ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
1269 if (!ep) 426 if (!ep)
1270 goto autoconf_fail; 427 goto autoconf_fail;
1271 dev->dev_out_ep = ep; 428 dev->gser.out = ep;
1272 ep->driver_data = dev; /* claim the endpoint */ 429 ep->driver_data = dev; /* claim the endpoint */
1273 430
1274 if (use_acm) { 431 if (use_acm) {
@@ -1279,7 +436,7 @@ static int __init gs_bind(struct usb_gadget *gadget)
1279 } 436 }
1280 gs_device_desc.idProduct = __constant_cpu_to_le16( 437 gs_device_desc.idProduct = __constant_cpu_to_le16(
1281 GS_CDC_PRODUCT_ID), 438 GS_CDC_PRODUCT_ID),
1282 dev->dev_notify_ep = ep; 439 dev->gser.notify = ep;
1283 ep->driver_data = dev; /* claim the endpoint */ 440 ep->driver_data = dev; /* claim the endpoint */
1284 } 441 }
1285 442
@@ -1310,41 +467,32 @@ static int __init gs_bind(struct usb_gadget *gadget)
1310 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP; 467 gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
1311 } 468 }
1312 469
1313 gs_device = dev;
1314
1315 snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s", 470 snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
1316 init_utsname()->sysname, init_utsname()->release, 471 init_utsname()->sysname, init_utsname()->release,
1317 gadget->name); 472 gadget->name);
1318 473
1319 dev->dev_gadget = gadget; 474 dev->dev_gadget = gadget;
1320 spin_lock_init(&dev->dev_lock); 475 spin_lock_init(&dev->dev_lock);
1321 INIT_LIST_HEAD(&dev->dev_req_list);
1322 set_gadget_data(gadget, dev); 476 set_gadget_data(gadget, dev);
1323 477
1324 if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
1325 pr_err("gs_bind: cannot allocate ports\n");
1326 gs_unbind(gadget);
1327 return ret;
1328 }
1329
1330 /* preallocate control response and buffer */ 478 /* preallocate control response and buffer */
1331 dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN, 479 dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
1332 GFP_KERNEL); 480 GFP_KERNEL);
1333 if (dev->dev_ctrl_req == NULL) { 481 if (dev->dev_ctrl_req == NULL) {
1334 gs_unbind(gadget); 482 ret = -ENOMEM;
1335 return -ENOMEM; 483 goto autoconf_fail;
1336 } 484 }
1337 gadget->ep0->driver_data = dev; 485 gadget->ep0->driver_data = dev;
1338 486
1339 pr_info("gs_bind: %s %s bound\n", 487 pr_info("gs_bind: %s bound\n", GS_VERSION_NAME);
1340 GS_LONG_NAME, GS_VERSION_STR);
1341 488
1342 return 0; 489 return 0;
1343 490
1344autoconf_fail: 491autoconf_fail:
1345 kfree(dev); 492 kfree(dev);
1346 pr_err("gs_bind: cannot autoconfigure on %s\n", gadget->name); 493 gserial_cleanup();
1347 return -ENODEV; 494 pr_err("gs_bind: to %s, err %d\n", gadget->name, ret);
495 return ret;
1348} 496}
1349 497
1350static int gs_setup_standard(struct usb_gadget *gadget, 498static int gs_setup_standard(struct usb_gadget *gadget,
@@ -1435,15 +583,14 @@ static int gs_setup_standard(struct usb_gadget *gadget,
1435 } 583 }
1436 if (dev->dev_config != GS_BULK_CONFIG_ID 584 if (dev->dev_config != GS_BULK_CONFIG_ID
1437 && wIndex == GS_CONTROL_INTERFACE_ID) { 585 && wIndex == GS_CONTROL_INTERFACE_ID) {
1438 if (dev->dev_notify_ep) { 586 if (dev->gser.notify) {
1439 usb_ep_disable(dev->dev_notify_ep); 587 usb_ep_disable(dev->gser.notify);
1440 usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc); 588 usb_ep_enable(dev->gser.notify,
589 dev->gser.notify_desc);
1441 } 590 }
1442 } else { 591 } else {
1443 usb_ep_disable(dev->dev_in_ep); 592 gserial_connect(&dev->gser, 0);
1444 usb_ep_disable(dev->dev_out_ep); 593 gserial_disconnect(&dev->gser);
1445 usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
1446 usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
1447 } 594 }
1448 ret = 0; 595 ret = 0;
1449set_interface_done: 596set_interface_done:
@@ -1480,23 +627,22 @@ static void gs_setup_complete_set_line_coding(struct usb_ep *ep,
1480 struct usb_request *req) 627 struct usb_request *req)
1481{ 628{
1482 struct gs_dev *dev = ep->driver_data; 629 struct gs_dev *dev = ep->driver_data;
1483 struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
1484 630
1485 switch (req->status) { 631 switch (req->status) {
1486 case 0: 632 case 0:
1487 /* normal completion */ 633 /* normal completion */
1488 if (req->actual != sizeof(port->port_line_coding)) 634 if (req->actual != sizeof(dev->gser.port_line_coding))
1489 usb_ep_set_halt(ep); 635 usb_ep_set_halt(ep);
1490 else if (port) { 636 else {
1491 struct usb_cdc_line_coding *value = req->buf; 637 struct usb_cdc_line_coding *value = req->buf;
1492 638
1493 /* REVISIT: we currently just remember this data. 639 /* REVISIT: we currently just remember this data.
1494 * If we change that, (a) validate it first, then 640 * If we change that, (a) validate it first, then
1495 * (b) update whatever hardware needs updating. 641 * (b) update whatever hardware needs updating.
1496 */ 642 */
1497 spin_lock(&port->port_lock); 643 spin_lock(&dev->dev_lock);
1498 port->port_line_coding = *value; 644 dev->gser.port_line_coding = *value;
1499 spin_unlock(&port->port_lock); 645 spin_unlock(&dev->dev_lock);
1500 } 646 }
1501 break; 647 break;
1502 648
@@ -1517,7 +663,6 @@ static int gs_setup_class(struct usb_gadget *gadget,
1517{ 663{
1518 int ret = -EOPNOTSUPP; 664 int ret = -EOPNOTSUPP;
1519 struct gs_dev *dev = get_gadget_data(gadget); 665 struct gs_dev *dev = get_gadget_data(gadget);
1520 struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
1521 struct usb_request *req = dev->dev_ctrl_req; 666 struct usb_request *req = dev->dev_ctrl_req;
1522 u16 wIndex = le16_to_cpu(ctrl->wIndex); 667 u16 wIndex = le16_to_cpu(ctrl->wIndex);
1523 u16 wValue = le16_to_cpu(ctrl->wValue); 668 u16 wValue = le16_to_cpu(ctrl->wValue);
@@ -1533,26 +678,22 @@ static int gs_setup_class(struct usb_gadget *gadget,
1533 678
1534 case USB_CDC_REQ_GET_LINE_CODING: 679 case USB_CDC_REQ_GET_LINE_CODING:
1535 ret = min_t(int, wLength, sizeof(struct usb_cdc_line_coding)); 680 ret = min_t(int, wLength, sizeof(struct usb_cdc_line_coding));
1536 if (port) { 681 spin_lock(&dev->dev_lock);
1537 spin_lock(&port->port_lock); 682 memcpy(req->buf, &dev->gser.port_line_coding, ret);
1538 memcpy(req->buf, &port->port_line_coding, ret); 683 spin_unlock(&dev->dev_lock);
1539 spin_unlock(&port->port_lock);
1540 }
1541 break; 684 break;
1542 685
1543 case USB_CDC_REQ_SET_CONTROL_LINE_STATE: 686 case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
1544 if (wLength != 0) 687 if (wLength != 0)
1545 break; 688 break;
1546 ret = 0; 689 ret = 0;
1547 if (port) { 690 /* REVISIT: we currently just remember this data.
1548 /* REVISIT: we currently just remember this data. 691 * If we change that, update whatever hardware needs
1549 * If we change that, update whatever hardware needs 692 * updating.
1550 * updating. 693 */
1551 */ 694 spin_lock(&dev->dev_lock);
1552 spin_lock(&port->port_lock); 695 dev->gser.port_handshake_bits = wValue;
1553 port->port_handshake_bits = wValue; 696 spin_unlock(&dev->dev_lock);
1554 spin_unlock(&port->port_lock);
1555 }
1556 break; 697 break;
1557 698
1558 default: 699 default:
@@ -1654,17 +795,7 @@ static void gs_disconnect(struct usb_gadget *gadget)
1654 struct gs_dev *dev = get_gadget_data(gadget); 795 struct gs_dev *dev = get_gadget_data(gadget);
1655 796
1656 spin_lock_irqsave(&dev->dev_lock, flags); 797 spin_lock_irqsave(&dev->dev_lock, flags);
1657
1658 gs_reset_config(dev); 798 gs_reset_config(dev);
1659
1660 /* free closed ports and disconnect open ports */
1661 /* (open ports will be freed when closed) */
1662 gs_free_ports(dev);
1663
1664 /* re-allocate ports for the next connection */
1665 if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
1666 pr_err("gs_disconnect: cannot re-allocate ports\n");
1667
1668 spin_unlock_irqrestore(&dev->dev_lock, flags); 799 spin_unlock_irqrestore(&dev->dev_lock, flags);
1669 800
1670 pr_info("gs_disconnect: %s disconnected\n", GS_LONG_NAME); 801 pr_info("gs_disconnect: %s disconnected\n", GS_LONG_NAME);
@@ -1698,17 +829,8 @@ static struct usb_gadget_driver gs_gadget_driver = {
1698 */ 829 */
1699static int gs_set_config(struct gs_dev *dev, unsigned config) 830static int gs_set_config(struct gs_dev *dev, unsigned config)
1700{ 831{
1701 int i;
1702 int ret = 0; 832 int ret = 0;
1703 struct usb_gadget *gadget = dev->dev_gadget; 833 struct usb_gadget *gadget = dev->dev_gadget;
1704 struct usb_ep *ep;
1705 struct usb_endpoint_descriptor *out, *in, *notify;
1706 struct usb_request *req;
1707
1708 if (dev == NULL) {
1709 pr_err("gs_set_config: NULL device pointer\n");
1710 return 0;
1711 }
1712 834
1713 if (config == dev->dev_config) 835 if (config == dev->dev_config)
1714 return 0; 836 return 0;
@@ -1730,85 +852,37 @@ static int gs_set_config(struct gs_dev *dev, unsigned config)
1730 return -EINVAL; 852 return -EINVAL;
1731 } 853 }
1732 854
1733 in = choose_ep_desc(gadget, 855 dev->gser.in_desc = choose_ep_desc(gadget,
1734 &gs_highspeed_in_desc, 856 &gs_highspeed_in_desc,
1735 &gs_fullspeed_in_desc); 857 &gs_fullspeed_in_desc);
1736 out = choose_ep_desc(gadget, 858 dev->gser.out_desc = choose_ep_desc(gadget,
1737 &gs_highspeed_out_desc, 859 &gs_highspeed_out_desc,
1738 &gs_fullspeed_out_desc); 860 &gs_fullspeed_out_desc);
1739 notify = dev->dev_notify_ep 861 dev->gser.notify_desc = dev->gser.notify
1740 ? choose_ep_desc(gadget, 862 ? choose_ep_desc(gadget,
1741 &gs_highspeed_notify_desc, 863 &gs_highspeed_notify_desc,
1742 &gs_fullspeed_notify_desc) 864 &gs_fullspeed_notify_desc)
1743 : NULL; 865 : NULL;
1744 866
1745 ret = usb_ep_enable(dev->dev_in_ep, in); 867 /* only support one "serial" port for now */
1746 if (ret == 0) { 868 if (dev->gser.notify) {
1747 dev->dev_in_ep_desc = in; 869 ret = usb_ep_enable(dev->gser.notify, dev->gser.notify_desc);
1748 } else { 870 if (ret < 0)
1749 pr_debug("%s: cannot enable %s %s, ret=%d\n", 871 return ret;
1750 __func__, "IN", dev->dev_in_ep->name, ret); 872 dev->gser.notify->driver_data = dev;
1751 return ret;
1752 }
1753
1754 ret = usb_ep_enable(dev->dev_out_ep, out);
1755 if (ret == 0) {
1756 dev->dev_out_ep_desc = out;
1757 } else {
1758 pr_debug("%s: cannot enable %s %s, ret=%d\n",
1759 __func__, "OUT", dev->dev_out_ep->name, ret);
1760fail0:
1761 usb_ep_disable(dev->dev_in_ep);
1762 return ret;
1763 } 873 }
1764 874
1765 if (notify) { 875 ret = gserial_connect(&dev->gser, 0);
1766 ret = usb_ep_enable(dev->dev_notify_ep, notify); 876 if (ret < 0) {
1767 if (ret == 0) { 877 if (dev->gser.notify) {
1768 dev->dev_notify_ep_desc = notify; 878 usb_ep_disable(dev->gser.notify);
1769 } else { 879 dev->gser.notify->driver_data = NULL;
1770 pr_debug("%s: cannot enable %s %s, ret=%d\n",
1771 __func__, "NOTIFY",
1772 dev->dev_notify_ep->name, ret);
1773 usb_ep_disable(dev->dev_out_ep);
1774 goto fail0;
1775 } 880 }
881 return ret;
1776 } 882 }
1777 883
1778 dev->dev_config = config; 884 dev->dev_config = config;
1779 885
1780 /* allocate and queue read requests */
1781 ep = dev->dev_out_ep;
1782 for (i=0; i<read_q_size && ret == 0; i++) {
1783 if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
1784 req->complete = gs_read_complete;
1785 if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
1786 pr_err("gs_set_config: cannot queue read "
1787 "request, ret=%d\n", ret);
1788 }
1789 } else {
1790 pr_err("gs_set_config: cannot allocate "
1791 "read requests\n");
1792 ret = -ENOMEM;
1793 goto exit_reset_config;
1794 }
1795 }
1796
1797 /* allocate write requests, and put on free list */
1798 ep = dev->dev_in_ep;
1799 for (i=0; i<write_q_size; i++) {
1800 req = gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC);
1801 if (req) {
1802 req->complete = gs_write_complete;
1803 list_add(&req->list, &dev->dev_req_list);
1804 } else {
1805 pr_err("gs_set_config: cannot allocate "
1806 "write requests\n");
1807 ret = -ENOMEM;
1808 goto exit_reset_config;
1809 }
1810 }
1811
1812 /* REVISIT the ACM mode should be able to actually *issue* some 886 /* REVISIT the ACM mode should be able to actually *issue* some
1813 * notifications, for at least serial state change events if 887 * notifications, for at least serial state change events if
1814 * not also for network connection; say so in bmCapabilities. 888 * not also for network connection; say so in bmCapabilities.
@@ -1820,10 +894,6 @@ fail0:
1820 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM"); 894 config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
1821 895
1822 return 0; 896 return 0;
1823
1824exit_reset_config:
1825 gs_reset_config(dev);
1826 return ret;
1827} 897}
1828 898
1829/* 899/*
@@ -1838,32 +908,16 @@ exit_reset_config:
1838 */ 908 */
1839static void gs_reset_config(struct gs_dev *dev) 909static void gs_reset_config(struct gs_dev *dev)
1840{ 910{
1841 struct usb_request *req;
1842
1843 if (dev == NULL) {
1844 pr_err("gs_reset_config: NULL device pointer\n");
1845 return;
1846 }
1847
1848 if (dev->dev_config == GS_NO_CONFIG_ID) 911 if (dev->dev_config == GS_NO_CONFIG_ID)
1849 return; 912 return;
1850 913
1851 dev->dev_config = GS_NO_CONFIG_ID; 914 dev->dev_config = GS_NO_CONFIG_ID;
1852 915
1853 /* free write requests on the free list */ 916 gserial_disconnect(&dev->gser);
1854 while(!list_empty(&dev->dev_req_list)) { 917 if (dev->gser.notify) {
1855 req = list_entry(dev->dev_req_list.next, 918 usb_ep_disable(dev->gser.notify);
1856 struct usb_request, list); 919 dev->gser.notify->driver_data = NULL;
1857 list_del(&req->list);
1858 gs_free_req(dev->dev_in_ep, req);
1859 } 920 }
1860
1861 /* disable endpoints, forcing completion of pending i/o; */
1862 /* completion handlers free their requests in this case */
1863 if (dev->dev_notify_ep)
1864 usb_ep_disable(dev->dev_notify_ep);
1865 usb_ep_disable(dev->dev_in_ep);
1866 usb_ep_disable(dev->dev_out_ep);
1867} 921}
1868 922
1869/* 923/*
@@ -1956,254 +1010,8 @@ static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
1956 } 1010 }
1957} 1011}
1958 1012
1959/*
1960 * gs_alloc_ports
1961 *
1962 * Allocate all ports and set the gs_dev struct to point to them.
1963 * Return 0 if successful, or a negative error number.
1964 *
1965 * The device lock is normally held when calling this function.
1966 */
1967static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
1968{
1969 int i;
1970 struct gs_port *port;
1971
1972 if (dev == NULL)
1973 return -EIO;
1974
1975 for (i=0; i<GS_NUM_PORTS; i++) {
1976 if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
1977 return -ENOMEM;
1978
1979 port->port_dev = dev;
1980 port->port_num = i;
1981 port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
1982 port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
1983 port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
1984 port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
1985 spin_lock_init(&port->port_lock);
1986 init_waitqueue_head(&port->port_write_wait);
1987
1988 dev->dev_port[i] = port;
1989 }
1990
1991 return 0;
1992}
1993
1994/*
1995 * gs_free_ports
1996 *
1997 * Free all closed ports. Open ports are disconnected by
1998 * freeing their write buffers, setting their device pointers
1999 * and the pointers to them in the device to NULL. These
2000 * ports will be freed when closed.
2001 *
2002 * The device lock is normally held when calling this function.
2003 */
2004static void gs_free_ports(struct gs_dev *dev)
2005{
2006 int i;
2007 unsigned long flags;
2008 struct gs_port *port;
2009
2010 if (dev == NULL)
2011 return;
2012
2013 for (i=0; i<GS_NUM_PORTS; i++) {
2014 if ((port=dev->dev_port[i]) != NULL) {
2015 dev->dev_port[i] = NULL;
2016
2017 spin_lock_irqsave(&port->port_lock, flags);
2018
2019 if (port->port_write_buf != NULL) {
2020 gs_buf_free(port->port_write_buf);
2021 port->port_write_buf = NULL;
2022 }
2023
2024 if (port->port_open_count > 0 || port->port_in_use) {
2025 port->port_dev = NULL;
2026 wake_up_interruptible(&port->port_write_wait);
2027 if (port->port_tty) {
2028 tty_hangup(port->port_tty);
2029 }
2030 spin_unlock_irqrestore(&port->port_lock, flags);
2031 } else {
2032 spin_unlock_irqrestore(&port->port_lock, flags);
2033 kfree(port);
2034 }
2035
2036 }
2037 }
2038}
2039
2040/*-------------------------------------------------------------------------*/
2041
2042/* Circular Buffer */
2043
2044/*
2045 * gs_buf_alloc
2046 *
2047 * Allocate a circular buffer and all associated memory.
2048 */
2049static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
2050{
2051 struct gs_buf *gb;
2052
2053 if (size == 0)
2054 return NULL;
2055
2056 gb = kmalloc(sizeof(struct gs_buf), kmalloc_flags);
2057 if (gb == NULL)
2058 return NULL;
2059
2060 gb->buf_buf = kmalloc(size, kmalloc_flags);
2061 if (gb->buf_buf == NULL) {
2062 kfree(gb);
2063 return NULL;
2064 }
2065
2066 gb->buf_size = size;
2067 gb->buf_get = gb->buf_put = gb->buf_buf;
2068
2069 return gb;
2070}
2071
2072/*
2073 * gs_buf_free
2074 *
2075 * Free the buffer and all associated memory.
2076 */
2077static void gs_buf_free(struct gs_buf *gb)
2078{
2079 if (gb) {
2080 kfree(gb->buf_buf);
2081 kfree(gb);
2082 }
2083}
2084
2085/*
2086 * gs_buf_clear
2087 *
2088 * Clear out all data in the circular buffer.
2089 */
2090static void gs_buf_clear(struct gs_buf *gb)
2091{
2092 if (gb != NULL)
2093 gb->buf_get = gb->buf_put;
2094 /* equivalent to a get of all data available */
2095}
2096
2097/*
2098 * gs_buf_data_avail
2099 *
2100 * Return the number of bytes of data available in the circular
2101 * buffer.
2102 */
2103static unsigned int gs_buf_data_avail(struct gs_buf *gb)
2104{
2105 if (gb != NULL)
2106 return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
2107 else
2108 return 0;
2109}
2110
2111/*
2112 * gs_buf_space_avail
2113 *
2114 * Return the number of bytes of space available in the circular
2115 * buffer.
2116 */
2117static unsigned int gs_buf_space_avail(struct gs_buf *gb)
2118{
2119 if (gb != NULL)
2120 return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
2121 else
2122 return 0;
2123}
2124
2125/*
2126 * gs_buf_put
2127 *
2128 * Copy data data from a user buffer and put it into the circular buffer.
2129 * Restrict to the amount of space available.
2130 *
2131 * Return the number of bytes copied.
2132 */
2133static unsigned int
2134gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
2135{
2136 unsigned int len;
2137
2138 if (gb == NULL)
2139 return 0;
2140
2141 len = gs_buf_space_avail(gb);
2142 if (count > len)
2143 count = len;
2144
2145 if (count == 0)
2146 return 0;
2147
2148 len = gb->buf_buf + gb->buf_size - gb->buf_put;
2149 if (count > len) {
2150 memcpy(gb->buf_put, buf, len);
2151 memcpy(gb->buf_buf, buf+len, count - len);
2152 gb->buf_put = gb->buf_buf + count - len;
2153 } else {
2154 memcpy(gb->buf_put, buf, count);
2155 if (count < len)
2156 gb->buf_put += count;
2157 else /* count == len */
2158 gb->buf_put = gb->buf_buf;
2159 }
2160
2161 return count;
2162}
2163
2164/*
2165 * gs_buf_get
2166 *
2167 * Get data from the circular buffer and copy to the given buffer.
2168 * Restrict to the amount of data available.
2169 *
2170 * Return the number of bytes copied.
2171 */
2172static unsigned int
2173gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
2174{
2175 unsigned int len;
2176
2177 if (gb == NULL)
2178 return 0;
2179
2180 len = gs_buf_data_avail(gb);
2181 if (count > len)
2182 count = len;
2183
2184 if (count == 0)
2185 return 0;
2186
2187 len = gb->buf_buf + gb->buf_size - gb->buf_get;
2188 if (count > len) {
2189 memcpy(buf, gb->buf_get, len);
2190 memcpy(buf+len, gb->buf_buf, count - len);
2191 gb->buf_get = gb->buf_buf + count - len;
2192 } else {
2193 memcpy(buf, gb->buf_get, count);
2194 if (count < len)
2195 gb->buf_get += count;
2196 else /* count == len */
2197 gb->buf_get = gb->buf_buf;
2198 }
2199
2200 return count;
2201}
2202
2203/*-------------------------------------------------------------------------*/ 1013/*-------------------------------------------------------------------------*/
2204 1014
2205static struct tty_driver *gs_tty_driver;
2206
2207/* 1015/*
2208 * gs_module_init 1016 * gs_module_init
2209 * 1017 *
@@ -2211,50 +1019,7 @@ static struct tty_driver *gs_tty_driver;
2211 */ 1019 */
2212static int __init gs_module_init(void) 1020static int __init gs_module_init(void)
2213{ 1021{
2214 int i; 1022 return usb_gadget_register_driver(&gs_gadget_driver);
2215 int retval;
2216
2217 retval = usb_gadget_register_driver(&gs_gadget_driver);
2218 if (retval) {
2219 pr_err("gs_module_init: cannot register gadget driver, "
2220 "ret=%d\n", retval);
2221 return retval;
2222 }
2223
2224 gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
2225 if (!gs_tty_driver)
2226 return -ENOMEM;
2227 gs_tty_driver->owner = THIS_MODULE;
2228 gs_tty_driver->driver_name = GS_SHORT_NAME;
2229 gs_tty_driver->name = "ttygs";
2230 gs_tty_driver->major = GS_MAJOR;
2231 gs_tty_driver->minor_start = GS_MINOR_START;
2232 gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
2233 gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
2234 gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
2235 gs_tty_driver->init_termios = tty_std_termios;
2236 /* must match GS_DEFAULT_DTE_RATE and friends */
2237 gs_tty_driver->init_termios.c_cflag =
2238 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2239 gs_tty_driver->init_termios.c_ispeed = GS_DEFAULT_DTE_RATE;
2240 gs_tty_driver->init_termios.c_ospeed = GS_DEFAULT_DTE_RATE;
2241 tty_set_operations(gs_tty_driver, &gs_tty_ops);
2242
2243 for (i = 0; i < GS_NUM_PORTS; i++)
2244 mutex_init(&gs_open_close_lock[i]);
2245
2246 retval = tty_register_driver(gs_tty_driver);
2247 if (retval) {
2248 usb_gadget_unregister_driver(&gs_gadget_driver);
2249 put_tty_driver(gs_tty_driver);
2250 pr_err("gs_module_init: cannot register tty driver, "
2251 "ret=%d\n", retval);
2252 return retval;
2253 }
2254
2255 pr_info("gs_module_init: %s %s loaded\n",
2256 GS_LONG_NAME, GS_VERSION_STR);
2257 return 0;
2258} 1023}
2259module_init(gs_module_init); 1024module_init(gs_module_init);
2260 1025
@@ -2265,11 +1030,6 @@ module_init(gs_module_init);
2265 */ 1030 */
2266static void __exit gs_module_exit(void) 1031static void __exit gs_module_exit(void)
2267{ 1032{
2268 tty_unregister_driver(gs_tty_driver);
2269 put_tty_driver(gs_tty_driver);
2270 usb_gadget_unregister_driver(&gs_gadget_driver); 1033 usb_gadget_unregister_driver(&gs_gadget_driver);
2271
2272 pr_info("gs_module_exit: %s %s unloaded\n",
2273 GS_LONG_NAME, GS_VERSION_STR);
2274} 1034}
2275module_exit(gs_module_exit); 1035module_exit(gs_module_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-03 05:21:07 -0500