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[thirdparty/kernel/stable.git] / drivers / net / usb / hso.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Driver for Option High Speed Mobile Devices.
5 *
6 * Copyright (C) 2008 Option International
7 * Filip Aben <f.aben@option.com>
8 * Denis Joseph Barrow <d.barow@option.com>
9 * Jan Dumon <j.dumon@option.com>
10 * Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
11 * <ajb@spheresystems.co.uk>
12 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
13 * Copyright (C) 2008 Novell, Inc.
14 *
15 *****************************************************************************/
16
17 /******************************************************************************
18 *
19 * Description of the device:
20 *
21 * Interface 0: Contains the IP network interface on the bulk end points.
22 * The multiplexed serial ports are using the interrupt and
23 * control endpoints.
24 * Interrupt contains a bitmap telling which multiplexed
25 * serialport needs servicing.
26 *
27 * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
28 * port is opened, as this have a huge impact on the network port
29 * throughput.
30 *
31 * Interface 2: Standard modem interface - circuit switched interface, this
32 * can be used to make a standard ppp connection however it
33 * should not be used in conjunction with the IP network interface
34 * enabled for USB performance reasons i.e. if using this set
35 * ideally disable_net=1.
36 *
37 *****************************************************************************/
38
39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41 #include <linux/sched/signal.h>
42 #include <linux/slab.h>
43 #include <linux/init.h>
44 #include <linux/delay.h>
45 #include <linux/netdevice.h>
46 #include <linux/module.h>
47 #include <linux/ethtool.h>
48 #include <linux/usb.h>
49 #include <linux/tty.h>
50 #include <linux/tty_driver.h>
51 #include <linux/tty_flip.h>
52 #include <linux/kmod.h>
53 #include <linux/rfkill.h>
54 #include <linux/ip.h>
55 #include <linux/uaccess.h>
56 #include <linux/usb/cdc.h>
57 #include <net/arp.h>
58 #include <asm/byteorder.h>
59 #include <linux/serial_core.h>
60 #include <linux/serial.h>
61
62
63 #define MOD_AUTHOR "Option Wireless"
64 #define MOD_DESCRIPTION "USB High Speed Option driver"
65
66 #define HSO_MAX_NET_DEVICES 10
67 #define HSO__MAX_MTU 2048
68 #define DEFAULT_MTU 1500
69 #define DEFAULT_MRU 1500
70
71 #define CTRL_URB_RX_SIZE 1024
72 #define CTRL_URB_TX_SIZE 64
73
74 #define BULK_URB_RX_SIZE 4096
75 #define BULK_URB_TX_SIZE 8192
76
77 #define MUX_BULK_RX_BUF_SIZE HSO__MAX_MTU
78 #define MUX_BULK_TX_BUF_SIZE HSO__MAX_MTU
79 #define MUX_BULK_RX_BUF_COUNT 4
80 #define USB_TYPE_OPTION_VENDOR 0x20
81
82 /* These definitions are used with the struct hso_net flags element */
83 /* - use *_bit operations on it. (bit indices not values.) */
84 #define HSO_NET_RUNNING 0
85
86 #define HSO_NET_TX_TIMEOUT (HZ*10)
87
88 #define HSO_SERIAL_MAGIC 0x48534f31
89
90 /* Number of ttys to handle */
91 #define HSO_SERIAL_TTY_MINORS 256
92
93 #define MAX_RX_URBS 2
94
95 /*****************************************************************************/
96 /* Debugging functions */
97 /*****************************************************************************/
98 #define hso_dbg(lvl, fmt, ...) \
99 do { \
100 if ((lvl) & debug) \
101 pr_info("[%d:%s] " fmt, \
102 __LINE__, __func__, ##__VA_ARGS__); \
103 } while (0)
104
105 /*****************************************************************************/
106 /* Enumerators */
107 /*****************************************************************************/
108 enum pkt_parse_state {
109 WAIT_IP,
110 WAIT_DATA,
111 WAIT_SYNC
112 };
113
114 /*****************************************************************************/
115 /* Structs */
116 /*****************************************************************************/
117
118 struct hso_shared_int {
119 struct usb_endpoint_descriptor *intr_endp;
120 void *shared_intr_buf;
121 struct urb *shared_intr_urb;
122 struct usb_device *usb;
123 int use_count;
124 int ref_count;
125 struct mutex shared_int_lock;
126 };
127
128 struct hso_net {
129 struct hso_device *parent;
130 struct net_device *net;
131 struct rfkill *rfkill;
132 char name[24];
133
134 struct usb_endpoint_descriptor *in_endp;
135 struct usb_endpoint_descriptor *out_endp;
136
137 struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
138 struct urb *mux_bulk_tx_urb;
139 void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
140 void *mux_bulk_tx_buf;
141
142 struct sk_buff *skb_rx_buf;
143 struct sk_buff *skb_tx_buf;
144
145 enum pkt_parse_state rx_parse_state;
146 spinlock_t net_lock;
147
148 unsigned short rx_buf_size;
149 unsigned short rx_buf_missing;
150 struct iphdr rx_ip_hdr;
151
152 unsigned long flags;
153 };
154
155 enum rx_ctrl_state{
156 RX_IDLE,
157 RX_SENT,
158 RX_PENDING
159 };
160
161 #define BM_REQUEST_TYPE (0xa1)
162 #define B_NOTIFICATION (0x20)
163 #define W_VALUE (0x0)
164 #define W_LENGTH (0x2)
165
166 #define B_OVERRUN (0x1<<6)
167 #define B_PARITY (0x1<<5)
168 #define B_FRAMING (0x1<<4)
169 #define B_RING_SIGNAL (0x1<<3)
170 #define B_BREAK (0x1<<2)
171 #define B_TX_CARRIER (0x1<<1)
172 #define B_RX_CARRIER (0x1<<0)
173
174 struct hso_serial_state_notification {
175 u8 bmRequestType;
176 u8 bNotification;
177 u16 wValue;
178 u16 wIndex;
179 u16 wLength;
180 u16 UART_state_bitmap;
181 } __packed;
182
183 struct hso_tiocmget {
184 struct mutex mutex;
185 wait_queue_head_t waitq;
186 int intr_completed;
187 struct usb_endpoint_descriptor *endp;
188 struct urb *urb;
189 struct hso_serial_state_notification serial_state_notification;
190 u16 prev_UART_state_bitmap;
191 struct uart_icount icount;
192 };
193
194
195 struct hso_serial {
196 struct hso_device *parent;
197 int magic;
198 u8 minor;
199
200 struct hso_shared_int *shared_int;
201
202 /* rx/tx urb could be either a bulk urb or a control urb depending
203 on which serial port it is used on. */
204 struct urb *rx_urb[MAX_RX_URBS];
205 u8 num_rx_urbs;
206 u8 *rx_data[MAX_RX_URBS];
207 u16 rx_data_length; /* should contain allocated length */
208
209 struct urb *tx_urb;
210 u8 *tx_data;
211 u8 *tx_buffer;
212 u16 tx_data_length; /* should contain allocated length */
213 u16 tx_data_count;
214 u16 tx_buffer_count;
215 struct usb_ctrlrequest ctrl_req_tx;
216 struct usb_ctrlrequest ctrl_req_rx;
217
218 struct usb_endpoint_descriptor *in_endp;
219 struct usb_endpoint_descriptor *out_endp;
220
221 enum rx_ctrl_state rx_state;
222 u8 rts_state;
223 u8 dtr_state;
224 unsigned tx_urb_used:1;
225
226 struct tty_port port;
227 /* from usb_serial_port */
228 spinlock_t serial_lock;
229
230 int (*write_data) (struct hso_serial *serial);
231 struct hso_tiocmget *tiocmget;
232 /* Hacks required to get flow control
233 * working on the serial receive buffers
234 * so as not to drop characters on the floor.
235 */
236 int curr_rx_urb_idx;
237 u8 rx_urb_filled[MAX_RX_URBS];
238 struct tasklet_struct unthrottle_tasklet;
239 };
240
241 struct hso_device {
242 union {
243 struct hso_serial *dev_serial;
244 struct hso_net *dev_net;
245 } port_data;
246
247 u32 port_spec;
248
249 u8 is_active;
250 u8 usb_gone;
251 struct work_struct async_get_intf;
252 struct work_struct async_put_intf;
253
254 struct usb_device *usb;
255 struct usb_interface *interface;
256
257 struct device *dev;
258 struct kref ref;
259 struct mutex mutex;
260 };
261
262 /* Type of interface */
263 #define HSO_INTF_MASK 0xFF00
264 #define HSO_INTF_MUX 0x0100
265 #define HSO_INTF_BULK 0x0200
266
267 /* Type of port */
268 #define HSO_PORT_MASK 0xFF
269 #define HSO_PORT_NO_PORT 0x0
270 #define HSO_PORT_CONTROL 0x1
271 #define HSO_PORT_APP 0x2
272 #define HSO_PORT_GPS 0x3
273 #define HSO_PORT_PCSC 0x4
274 #define HSO_PORT_APP2 0x5
275 #define HSO_PORT_GPS_CONTROL 0x6
276 #define HSO_PORT_MSD 0x7
277 #define HSO_PORT_VOICE 0x8
278 #define HSO_PORT_DIAG2 0x9
279 #define HSO_PORT_DIAG 0x10
280 #define HSO_PORT_MODEM 0x11
281 #define HSO_PORT_NETWORK 0x12
282
283 /* Additional device info */
284 #define HSO_INFO_MASK 0xFF000000
285 #define HSO_INFO_CRC_BUG 0x01000000
286
287 /*****************************************************************************/
288 /* Prototypes */
289 /*****************************************************************************/
290 /* Serial driver functions */
291 static int hso_serial_tiocmset(struct tty_struct *tty,
292 unsigned int set, unsigned int clear);
293 static void ctrl_callback(struct urb *urb);
294 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
295 static void hso_kick_transmit(struct hso_serial *serial);
296 /* Helper functions */
297 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
298 struct usb_device *usb, gfp_t gfp);
299 static void handle_usb_error(int status, const char *function,
300 struct hso_device *hso_dev);
301 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
302 int type, int dir);
303 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
304 static void hso_free_interface(struct usb_interface *intf);
305 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
306 static int hso_stop_serial_device(struct hso_device *hso_dev);
307 static int hso_start_net_device(struct hso_device *hso_dev);
308 static void hso_free_shared_int(struct hso_shared_int *shared_int);
309 static int hso_stop_net_device(struct hso_device *hso_dev);
310 static void hso_serial_ref_free(struct kref *ref);
311 static void hso_std_serial_read_bulk_callback(struct urb *urb);
312 static int hso_mux_serial_read(struct hso_serial *serial);
313 static void async_get_intf(struct work_struct *data);
314 static void async_put_intf(struct work_struct *data);
315 static int hso_put_activity(struct hso_device *hso_dev);
316 static int hso_get_activity(struct hso_device *hso_dev);
317 static void tiocmget_intr_callback(struct urb *urb);
318 /*****************************************************************************/
319 /* Helping functions */
320 /*****************************************************************************/
321
322 /* #define DEBUG */
323
324 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
325 {
326 return hso_dev->port_data.dev_net;
327 }
328
329 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
330 {
331 return hso_dev->port_data.dev_serial;
332 }
333
334 /* Debugging functions */
335 #ifdef DEBUG
336 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
337 unsigned int len)
338 {
339 static char name[255];
340
341 sprintf(name, "hso[%d:%s]", line_count, func_name);
342 print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
343 }
344
345 #define DUMP(buf_, len_) \
346 dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
347
348 #define DUMP1(buf_, len_) \
349 do { \
350 if (0x01 & debug) \
351 DUMP(buf_, len_); \
352 } while (0)
353 #else
354 #define DUMP(buf_, len_)
355 #define DUMP1(buf_, len_)
356 #endif
357
358 /* module parameters */
359 static int debug;
360 static int tty_major;
361 static int disable_net;
362
363 /* driver info */
364 static const char driver_name[] = "hso";
365 static const char tty_filename[] = "ttyHS";
366 static const char *version = __FILE__ ": " MOD_AUTHOR;
367 /* the usb driver itself (registered in hso_init) */
368 static struct usb_driver hso_driver;
369 /* serial structures */
370 static struct tty_driver *tty_drv;
371 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
372 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
373 static spinlock_t serial_table_lock;
374
375 static const s32 default_port_spec[] = {
376 HSO_INTF_MUX | HSO_PORT_NETWORK,
377 HSO_INTF_BULK | HSO_PORT_DIAG,
378 HSO_INTF_BULK | HSO_PORT_MODEM,
379 0
380 };
381
382 static const s32 icon321_port_spec[] = {
383 HSO_INTF_MUX | HSO_PORT_NETWORK,
384 HSO_INTF_BULK | HSO_PORT_DIAG2,
385 HSO_INTF_BULK | HSO_PORT_MODEM,
386 HSO_INTF_BULK | HSO_PORT_DIAG,
387 0
388 };
389
390 #define default_port_device(vendor, product) \
391 USB_DEVICE(vendor, product), \
392 .driver_info = (kernel_ulong_t)default_port_spec
393
394 #define icon321_port_device(vendor, product) \
395 USB_DEVICE(vendor, product), \
396 .driver_info = (kernel_ulong_t)icon321_port_spec
397
398 /* list of devices we support */
399 static const struct usb_device_id hso_ids[] = {
400 {default_port_device(0x0af0, 0x6711)},
401 {default_port_device(0x0af0, 0x6731)},
402 {default_port_device(0x0af0, 0x6751)},
403 {default_port_device(0x0af0, 0x6771)},
404 {default_port_device(0x0af0, 0x6791)},
405 {default_port_device(0x0af0, 0x6811)},
406 {default_port_device(0x0af0, 0x6911)},
407 {default_port_device(0x0af0, 0x6951)},
408 {default_port_device(0x0af0, 0x6971)},
409 {default_port_device(0x0af0, 0x7011)},
410 {default_port_device(0x0af0, 0x7031)},
411 {default_port_device(0x0af0, 0x7051)},
412 {default_port_device(0x0af0, 0x7071)},
413 {default_port_device(0x0af0, 0x7111)},
414 {default_port_device(0x0af0, 0x7211)},
415 {default_port_device(0x0af0, 0x7251)},
416 {default_port_device(0x0af0, 0x7271)},
417 {default_port_device(0x0af0, 0x7311)},
418 {default_port_device(0x0af0, 0xc031)}, /* Icon-Edge */
419 {icon321_port_device(0x0af0, 0xd013)}, /* Module HSxPA */
420 {icon321_port_device(0x0af0, 0xd031)}, /* Icon-321 */
421 {icon321_port_device(0x0af0, 0xd033)}, /* Icon-322 */
422 {USB_DEVICE(0x0af0, 0x7301)}, /* GE40x */
423 {USB_DEVICE(0x0af0, 0x7361)}, /* GE40x */
424 {USB_DEVICE(0x0af0, 0x7381)}, /* GE40x */
425 {USB_DEVICE(0x0af0, 0x7401)}, /* GI 0401 */
426 {USB_DEVICE(0x0af0, 0x7501)}, /* GTM 382 */
427 {USB_DEVICE(0x0af0, 0x7601)}, /* GE40x */
428 {USB_DEVICE(0x0af0, 0x7701)},
429 {USB_DEVICE(0x0af0, 0x7706)},
430 {USB_DEVICE(0x0af0, 0x7801)},
431 {USB_DEVICE(0x0af0, 0x7901)},
432 {USB_DEVICE(0x0af0, 0x7A01)},
433 {USB_DEVICE(0x0af0, 0x7A05)},
434 {USB_DEVICE(0x0af0, 0x8200)},
435 {USB_DEVICE(0x0af0, 0x8201)},
436 {USB_DEVICE(0x0af0, 0x8300)},
437 {USB_DEVICE(0x0af0, 0x8302)},
438 {USB_DEVICE(0x0af0, 0x8304)},
439 {USB_DEVICE(0x0af0, 0x8400)},
440 {USB_DEVICE(0x0af0, 0x8600)},
441 {USB_DEVICE(0x0af0, 0x8800)},
442 {USB_DEVICE(0x0af0, 0x8900)},
443 {USB_DEVICE(0x0af0, 0x9000)},
444 {USB_DEVICE(0x0af0, 0x9200)}, /* Option GTM671WFS */
445 {USB_DEVICE(0x0af0, 0xd035)},
446 {USB_DEVICE(0x0af0, 0xd055)},
447 {USB_DEVICE(0x0af0, 0xd155)},
448 {USB_DEVICE(0x0af0, 0xd255)},
449 {USB_DEVICE(0x0af0, 0xd057)},
450 {USB_DEVICE(0x0af0, 0xd157)},
451 {USB_DEVICE(0x0af0, 0xd257)},
452 {USB_DEVICE(0x0af0, 0xd357)},
453 {USB_DEVICE(0x0af0, 0xd058)},
454 {USB_DEVICE(0x0af0, 0xc100)},
455 {}
456 };
457 MODULE_DEVICE_TABLE(usb, hso_ids);
458
459 /* Sysfs attribute */
460 static ssize_t hso_sysfs_show_porttype(struct device *dev,
461 struct device_attribute *attr,
462 char *buf)
463 {
464 struct hso_device *hso_dev = dev_get_drvdata(dev);
465 char *port_name;
466
467 if (!hso_dev)
468 return 0;
469
470 switch (hso_dev->port_spec & HSO_PORT_MASK) {
471 case HSO_PORT_CONTROL:
472 port_name = "Control";
473 break;
474 case HSO_PORT_APP:
475 port_name = "Application";
476 break;
477 case HSO_PORT_APP2:
478 port_name = "Application2";
479 break;
480 case HSO_PORT_GPS:
481 port_name = "GPS";
482 break;
483 case HSO_PORT_GPS_CONTROL:
484 port_name = "GPS Control";
485 break;
486 case HSO_PORT_PCSC:
487 port_name = "PCSC";
488 break;
489 case HSO_PORT_DIAG:
490 port_name = "Diagnostic";
491 break;
492 case HSO_PORT_DIAG2:
493 port_name = "Diagnostic2";
494 break;
495 case HSO_PORT_MODEM:
496 port_name = "Modem";
497 break;
498 case HSO_PORT_NETWORK:
499 port_name = "Network";
500 break;
501 default:
502 port_name = "Unknown";
503 break;
504 }
505
506 return sprintf(buf, "%s\n", port_name);
507 }
508 static DEVICE_ATTR(hsotype, 0444, hso_sysfs_show_porttype, NULL);
509
510 static struct attribute *hso_serial_dev_attrs[] = {
511 &dev_attr_hsotype.attr,
512 NULL
513 };
514
515 ATTRIBUTE_GROUPS(hso_serial_dev);
516
517 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
518 {
519 int idx;
520
521 for (idx = 0; idx < serial->num_rx_urbs; idx++)
522 if (serial->rx_urb[idx] == urb)
523 return idx;
524 dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
525 return -1;
526 }
527
528 /* converts mux value to a port spec value */
529 static u32 hso_mux_to_port(int mux)
530 {
531 u32 result;
532
533 switch (mux) {
534 case 0x1:
535 result = HSO_PORT_CONTROL;
536 break;
537 case 0x2:
538 result = HSO_PORT_APP;
539 break;
540 case 0x4:
541 result = HSO_PORT_PCSC;
542 break;
543 case 0x8:
544 result = HSO_PORT_GPS;
545 break;
546 case 0x10:
547 result = HSO_PORT_APP2;
548 break;
549 default:
550 result = HSO_PORT_NO_PORT;
551 }
552 return result;
553 }
554
555 /* converts port spec value to a mux value */
556 static u32 hso_port_to_mux(int port)
557 {
558 u32 result;
559
560 switch (port & HSO_PORT_MASK) {
561 case HSO_PORT_CONTROL:
562 result = 0x0;
563 break;
564 case HSO_PORT_APP:
565 result = 0x1;
566 break;
567 case HSO_PORT_PCSC:
568 result = 0x2;
569 break;
570 case HSO_PORT_GPS:
571 result = 0x3;
572 break;
573 case HSO_PORT_APP2:
574 result = 0x4;
575 break;
576 default:
577 result = 0x0;
578 }
579 return result;
580 }
581
582 static struct hso_serial *get_serial_by_shared_int_and_type(
583 struct hso_shared_int *shared_int,
584 int mux)
585 {
586 int i, port;
587
588 port = hso_mux_to_port(mux);
589
590 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
591 if (serial_table[i] &&
592 (dev2ser(serial_table[i])->shared_int == shared_int) &&
593 ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
594 return dev2ser(serial_table[i]);
595 }
596 }
597
598 return NULL;
599 }
600
601 static struct hso_serial *get_serial_by_index(unsigned index)
602 {
603 struct hso_serial *serial = NULL;
604 unsigned long flags;
605
606 spin_lock_irqsave(&serial_table_lock, flags);
607 if (serial_table[index])
608 serial = dev2ser(serial_table[index]);
609 spin_unlock_irqrestore(&serial_table_lock, flags);
610
611 return serial;
612 }
613
614 static int get_free_serial_index(void)
615 {
616 int index;
617 unsigned long flags;
618
619 spin_lock_irqsave(&serial_table_lock, flags);
620 for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
621 if (serial_table[index] == NULL) {
622 spin_unlock_irqrestore(&serial_table_lock, flags);
623 return index;
624 }
625 }
626 spin_unlock_irqrestore(&serial_table_lock, flags);
627
628 pr_err("%s: no free serial devices in table\n", __func__);
629 return -1;
630 }
631
632 static void set_serial_by_index(unsigned index, struct hso_serial *serial)
633 {
634 unsigned long flags;
635
636 spin_lock_irqsave(&serial_table_lock, flags);
637 if (serial)
638 serial_table[index] = serial->parent;
639 else
640 serial_table[index] = NULL;
641 spin_unlock_irqrestore(&serial_table_lock, flags);
642 }
643
644 static void handle_usb_error(int status, const char *function,
645 struct hso_device *hso_dev)
646 {
647 char *explanation;
648
649 switch (status) {
650 case -ENODEV:
651 explanation = "no device";
652 break;
653 case -ENOENT:
654 explanation = "endpoint not enabled";
655 break;
656 case -EPIPE:
657 explanation = "endpoint stalled";
658 break;
659 case -ENOSPC:
660 explanation = "not enough bandwidth";
661 break;
662 case -ESHUTDOWN:
663 explanation = "device disabled";
664 break;
665 case -EHOSTUNREACH:
666 explanation = "device suspended";
667 break;
668 case -EINVAL:
669 case -EAGAIN:
670 case -EFBIG:
671 case -EMSGSIZE:
672 explanation = "internal error";
673 break;
674 case -EILSEQ:
675 case -EPROTO:
676 case -ETIME:
677 case -ETIMEDOUT:
678 explanation = "protocol error";
679 if (hso_dev)
680 usb_queue_reset_device(hso_dev->interface);
681 break;
682 default:
683 explanation = "unknown status";
684 break;
685 }
686
687 /* log a meaningful explanation of an USB status */
688 hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
689 function, explanation, status);
690 }
691
692 /* Network interface functions */
693
694 /* called when net interface is brought up by ifconfig */
695 static int hso_net_open(struct net_device *net)
696 {
697 struct hso_net *odev = netdev_priv(net);
698 unsigned long flags = 0;
699
700 if (!odev) {
701 dev_err(&net->dev, "No net device !\n");
702 return -ENODEV;
703 }
704
705 odev->skb_tx_buf = NULL;
706
707 /* setup environment */
708 spin_lock_irqsave(&odev->net_lock, flags);
709 odev->rx_parse_state = WAIT_IP;
710 odev->rx_buf_size = 0;
711 odev->rx_buf_missing = sizeof(struct iphdr);
712 spin_unlock_irqrestore(&odev->net_lock, flags);
713
714 /* We are up and running. */
715 set_bit(HSO_NET_RUNNING, &odev->flags);
716 hso_start_net_device(odev->parent);
717
718 /* Tell the kernel we are ready to start receiving from it */
719 netif_start_queue(net);
720
721 return 0;
722 }
723
724 /* called when interface is brought down by ifconfig */
725 static int hso_net_close(struct net_device *net)
726 {
727 struct hso_net *odev = netdev_priv(net);
728
729 /* we don't need the queue anymore */
730 netif_stop_queue(net);
731 /* no longer running */
732 clear_bit(HSO_NET_RUNNING, &odev->flags);
733
734 hso_stop_net_device(odev->parent);
735
736 /* done */
737 return 0;
738 }
739
740 /* USB tells is xmit done, we should start the netqueue again */
741 static void write_bulk_callback(struct urb *urb)
742 {
743 struct hso_net *odev = urb->context;
744 int status = urb->status;
745
746 /* Sanity check */
747 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
748 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
749 return;
750 }
751
752 /* Do we still have a valid kernel network device? */
753 if (!netif_device_present(odev->net)) {
754 dev_err(&urb->dev->dev, "%s: net device not present\n",
755 __func__);
756 return;
757 }
758
759 /* log status, but don't act on it, we don't need to resubmit anything
760 * anyhow */
761 if (status)
762 handle_usb_error(status, __func__, odev->parent);
763
764 hso_put_activity(odev->parent);
765
766 /* Tell the network interface we are ready for another frame */
767 netif_wake_queue(odev->net);
768 }
769
770 /* called by kernel when we need to transmit a packet */
771 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
772 struct net_device *net)
773 {
774 struct hso_net *odev = netdev_priv(net);
775 int result;
776
777 /* Tell the kernel, "No more frames 'til we are done with this one." */
778 netif_stop_queue(net);
779 if (hso_get_activity(odev->parent) == -EAGAIN) {
780 odev->skb_tx_buf = skb;
781 return NETDEV_TX_OK;
782 }
783
784 /* log if asked */
785 DUMP1(skb->data, skb->len);
786 /* Copy it from kernel memory to OUR memory */
787 memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
788 hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
789
790 /* Fill in the URB for shipping it out. */
791 usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
792 odev->parent->usb,
793 usb_sndbulkpipe(odev->parent->usb,
794 odev->out_endp->
795 bEndpointAddress & 0x7F),
796 odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
797 odev);
798
799 /* Deal with the Zero Length packet problem, I hope */
800 odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
801
802 /* Send the URB on its merry way. */
803 result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
804 if (result) {
805 dev_warn(&odev->parent->interface->dev,
806 "failed mux_bulk_tx_urb %d\n", result);
807 net->stats.tx_errors++;
808 netif_start_queue(net);
809 } else {
810 net->stats.tx_packets++;
811 net->stats.tx_bytes += skb->len;
812 }
813 dev_kfree_skb(skb);
814 /* we're done */
815 return NETDEV_TX_OK;
816 }
817
818 static const struct ethtool_ops ops = {
819 .get_link = ethtool_op_get_link
820 };
821
822 /* called when a packet did not ack after watchdogtimeout */
823 static void hso_net_tx_timeout(struct net_device *net)
824 {
825 struct hso_net *odev = netdev_priv(net);
826
827 if (!odev)
828 return;
829
830 /* Tell syslog we are hosed. */
831 dev_warn(&net->dev, "Tx timed out.\n");
832
833 /* Tear the waiting frame off the list */
834 if (odev->mux_bulk_tx_urb &&
835 (odev->mux_bulk_tx_urb->status == -EINPROGRESS))
836 usb_unlink_urb(odev->mux_bulk_tx_urb);
837
838 /* Update statistics */
839 net->stats.tx_errors++;
840 }
841
842 /* make a real packet from the received USB buffer */
843 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
844 unsigned int count, unsigned char is_eop)
845 {
846 unsigned short temp_bytes;
847 unsigned short buffer_offset = 0;
848 unsigned short frame_len;
849
850 /* log if needed */
851 hso_dbg(0x1, "Rx %d bytes\n", count);
852 DUMP(ip_pkt, min(128, (int)count));
853
854 while (count) {
855 switch (odev->rx_parse_state) {
856 case WAIT_IP:
857 /* waiting for IP header. */
858 /* wanted bytes - size of ip header */
859 temp_bytes =
860 (count <
861 odev->rx_buf_missing) ? count : odev->
862 rx_buf_missing;
863
864 memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
865 odev->rx_buf_size, ip_pkt + buffer_offset,
866 temp_bytes);
867
868 odev->rx_buf_size += temp_bytes;
869 buffer_offset += temp_bytes;
870 odev->rx_buf_missing -= temp_bytes;
871 count -= temp_bytes;
872
873 if (!odev->rx_buf_missing) {
874 /* header is complete allocate an sk_buffer and
875 * continue to WAIT_DATA */
876 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
877
878 if ((frame_len > DEFAULT_MRU) ||
879 (frame_len < sizeof(struct iphdr))) {
880 dev_err(&odev->net->dev,
881 "Invalid frame (%d) length\n",
882 frame_len);
883 odev->rx_parse_state = WAIT_SYNC;
884 continue;
885 }
886 /* Allocate an sk_buff */
887 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
888 frame_len);
889 if (!odev->skb_rx_buf) {
890 /* We got no receive buffer. */
891 hso_dbg(0x1, "could not allocate memory\n");
892 odev->rx_parse_state = WAIT_SYNC;
893 continue;
894 }
895
896 /* Copy what we got so far. make room for iphdr
897 * after tail. */
898 skb_put_data(odev->skb_rx_buf,
899 (char *)&(odev->rx_ip_hdr),
900 sizeof(struct iphdr));
901
902 /* ETH_HLEN */
903 odev->rx_buf_size = sizeof(struct iphdr);
904
905 /* Filip actually use .tot_len */
906 odev->rx_buf_missing =
907 frame_len - sizeof(struct iphdr);
908 odev->rx_parse_state = WAIT_DATA;
909 }
910 break;
911
912 case WAIT_DATA:
913 temp_bytes = (count < odev->rx_buf_missing)
914 ? count : odev->rx_buf_missing;
915
916 /* Copy the rest of the bytes that are left in the
917 * buffer into the waiting sk_buf. */
918 /* Make room for temp_bytes after tail. */
919 skb_put_data(odev->skb_rx_buf,
920 ip_pkt + buffer_offset,
921 temp_bytes);
922
923 odev->rx_buf_missing -= temp_bytes;
924 count -= temp_bytes;
925 buffer_offset += temp_bytes;
926 odev->rx_buf_size += temp_bytes;
927 if (!odev->rx_buf_missing) {
928 /* Packet is complete. Inject into stack. */
929 /* We have IP packet here */
930 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
931 skb_reset_mac_header(odev->skb_rx_buf);
932
933 /* Ship it off to the kernel */
934 netif_rx(odev->skb_rx_buf);
935 /* No longer our buffer. */
936 odev->skb_rx_buf = NULL;
937
938 /* update out statistics */
939 odev->net->stats.rx_packets++;
940
941 odev->net->stats.rx_bytes += odev->rx_buf_size;
942
943 odev->rx_buf_size = 0;
944 odev->rx_buf_missing = sizeof(struct iphdr);
945 odev->rx_parse_state = WAIT_IP;
946 }
947 break;
948
949 case WAIT_SYNC:
950 hso_dbg(0x1, " W_S\n");
951 count = 0;
952 break;
953 default:
954 hso_dbg(0x1, "\n");
955 count--;
956 break;
957 }
958 }
959
960 /* Recovery mechanism for WAIT_SYNC state. */
961 if (is_eop) {
962 if (odev->rx_parse_state == WAIT_SYNC) {
963 odev->rx_parse_state = WAIT_IP;
964 odev->rx_buf_size = 0;
965 odev->rx_buf_missing = sizeof(struct iphdr);
966 }
967 }
968 }
969
970 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
971 {
972 static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
973 u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
974
975 if (((rest == 5) || (rest == 6)) &&
976 !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
977 crc_check, 4)) {
978 urb->actual_length -= 4;
979 }
980 }
981
982 /* Moving data from usb to kernel (in interrupt state) */
983 static void read_bulk_callback(struct urb *urb)
984 {
985 struct hso_net *odev = urb->context;
986 struct net_device *net;
987 int result;
988 unsigned long flags;
989 int status = urb->status;
990
991 /* is al ok? (Filip: Who's Al ?) */
992 if (status) {
993 handle_usb_error(status, __func__, odev->parent);
994 return;
995 }
996
997 /* Sanity check */
998 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
999 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
1000 return;
1001 }
1002 usb_mark_last_busy(urb->dev);
1003
1004 net = odev->net;
1005
1006 if (!netif_device_present(net)) {
1007 /* Somebody killed our network interface... */
1008 return;
1009 }
1010
1011 if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1012 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1013
1014 /* do we even have a packet? */
1015 if (urb->actual_length) {
1016 /* Handle the IP stream, add header and push it onto network
1017 * stack if the packet is complete. */
1018 spin_lock_irqsave(&odev->net_lock, flags);
1019 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1020 (urb->transfer_buffer_length >
1021 urb->actual_length) ? 1 : 0);
1022 spin_unlock_irqrestore(&odev->net_lock, flags);
1023 }
1024
1025 /* We are done with this URB, resubmit it. Prep the USB to wait for
1026 * another frame. Reuse same as received. */
1027 usb_fill_bulk_urb(urb,
1028 odev->parent->usb,
1029 usb_rcvbulkpipe(odev->parent->usb,
1030 odev->in_endp->
1031 bEndpointAddress & 0x7F),
1032 urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1033 read_bulk_callback, odev);
1034
1035 /* Give this to the USB subsystem so it can tell us when more data
1036 * arrives. */
1037 result = usb_submit_urb(urb, GFP_ATOMIC);
1038 if (result)
1039 dev_warn(&odev->parent->interface->dev,
1040 "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1041 result);
1042 }
1043
1044 /* Serial driver functions */
1045
1046 static void hso_init_termios(struct ktermios *termios)
1047 {
1048 /*
1049 * The default requirements for this device are:
1050 */
1051 termios->c_iflag &=
1052 ~(IGNBRK /* disable ignore break */
1053 | BRKINT /* disable break causes interrupt */
1054 | PARMRK /* disable mark parity errors */
1055 | ISTRIP /* disable clear high bit of input characters */
1056 | INLCR /* disable translate NL to CR */
1057 | IGNCR /* disable ignore CR */
1058 | ICRNL /* disable translate CR to NL */
1059 | IXON); /* disable enable XON/XOFF flow control */
1060
1061 /* disable postprocess output characters */
1062 termios->c_oflag &= ~OPOST;
1063
1064 termios->c_lflag &=
1065 ~(ECHO /* disable echo input characters */
1066 | ECHONL /* disable echo new line */
1067 | ICANON /* disable erase, kill, werase, and rprnt
1068 special characters */
1069 | ISIG /* disable interrupt, quit, and suspend special
1070 characters */
1071 | IEXTEN); /* disable non-POSIX special characters */
1072
1073 termios->c_cflag &=
1074 ~(CSIZE /* no size */
1075 | PARENB /* disable parity bit */
1076 | CBAUD /* clear current baud rate */
1077 | CBAUDEX); /* clear current buad rate */
1078
1079 termios->c_cflag |= CS8; /* character size 8 bits */
1080
1081 /* baud rate 115200 */
1082 tty_termios_encode_baud_rate(termios, 115200, 115200);
1083 }
1084
1085 static void _hso_serial_set_termios(struct tty_struct *tty,
1086 struct ktermios *old)
1087 {
1088 struct hso_serial *serial = tty->driver_data;
1089
1090 if (!serial) {
1091 pr_err("%s: no tty structures", __func__);
1092 return;
1093 }
1094
1095 hso_dbg(0x8, "port %d\n", serial->minor);
1096
1097 /*
1098 * Fix up unsupported bits
1099 */
1100 tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1101
1102 tty->termios.c_cflag &=
1103 ~(CSIZE /* no size */
1104 | PARENB /* disable parity bit */
1105 | CBAUD /* clear current baud rate */
1106 | CBAUDEX); /* clear current buad rate */
1107
1108 tty->termios.c_cflag |= CS8; /* character size 8 bits */
1109
1110 /* baud rate 115200 */
1111 tty_encode_baud_rate(tty, 115200, 115200);
1112 }
1113
1114 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1115 {
1116 int result;
1117 /* We are done with this URB, resubmit it. Prep the USB to wait for
1118 * another frame */
1119 usb_fill_bulk_urb(urb, serial->parent->usb,
1120 usb_rcvbulkpipe(serial->parent->usb,
1121 serial->in_endp->
1122 bEndpointAddress & 0x7F),
1123 urb->transfer_buffer, serial->rx_data_length,
1124 hso_std_serial_read_bulk_callback, serial);
1125 /* Give this to the USB subsystem so it can tell us when more data
1126 * arrives. */
1127 result = usb_submit_urb(urb, GFP_ATOMIC);
1128 if (result) {
1129 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1130 __func__, result);
1131 }
1132 }
1133
1134
1135
1136
1137 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1138 {
1139 int count;
1140 struct urb *curr_urb;
1141
1142 while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1143 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1144 count = put_rxbuf_data(curr_urb, serial);
1145 if (count == -1)
1146 return;
1147 if (count == 0) {
1148 serial->curr_rx_urb_idx++;
1149 if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1150 serial->curr_rx_urb_idx = 0;
1151 hso_resubmit_rx_bulk_urb(serial, curr_urb);
1152 }
1153 }
1154 }
1155
1156 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1157 {
1158 int count = 0;
1159 struct urb *urb;
1160
1161 urb = serial->rx_urb[0];
1162 if (serial->port.count > 0) {
1163 count = put_rxbuf_data(urb, serial);
1164 if (count == -1)
1165 return;
1166 }
1167 /* Re issue a read as long as we receive data. */
1168
1169 if (count == 0 && ((urb->actual_length != 0) ||
1170 (serial->rx_state == RX_PENDING))) {
1171 serial->rx_state = RX_SENT;
1172 hso_mux_serial_read(serial);
1173 } else
1174 serial->rx_state = RX_IDLE;
1175 }
1176
1177
1178 /* read callback for Diag and CS port */
1179 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1180 {
1181 struct hso_serial *serial = urb->context;
1182 int status = urb->status;
1183 unsigned long flags;
1184
1185 hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1186
1187 /* sanity check */
1188 if (!serial) {
1189 hso_dbg(0x1, "serial == NULL\n");
1190 return;
1191 }
1192 if (status) {
1193 handle_usb_error(status, __func__, serial->parent);
1194 return;
1195 }
1196
1197 hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1198 DUMP1(urb->transfer_buffer, urb->actual_length);
1199
1200 /* Anyone listening? */
1201 if (serial->port.count == 0)
1202 return;
1203
1204 if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1205 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1206 /* Valid data, handle RX data */
1207 spin_lock_irqsave(&serial->serial_lock, flags);
1208 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1209 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1210 spin_unlock_irqrestore(&serial->serial_lock, flags);
1211 }
1212
1213 /*
1214 * This needs to be a tasklet otherwise we will
1215 * end up recursively calling this function.
1216 */
1217 static void hso_unthrottle_tasklet(struct hso_serial *serial)
1218 {
1219 unsigned long flags;
1220
1221 spin_lock_irqsave(&serial->serial_lock, flags);
1222 if ((serial->parent->port_spec & HSO_INTF_MUX))
1223 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1224 else
1225 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1226 spin_unlock_irqrestore(&serial->serial_lock, flags);
1227 }
1228
1229 static void hso_unthrottle(struct tty_struct *tty)
1230 {
1231 struct hso_serial *serial = tty->driver_data;
1232
1233 tasklet_hi_schedule(&serial->unthrottle_tasklet);
1234 }
1235
1236 /* open the requested serial port */
1237 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1238 {
1239 struct hso_serial *serial = get_serial_by_index(tty->index);
1240 int result;
1241
1242 /* sanity check */
1243 if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1244 WARN_ON(1);
1245 tty->driver_data = NULL;
1246 hso_dbg(0x1, "Failed to open port\n");
1247 return -ENODEV;
1248 }
1249
1250 mutex_lock(&serial->parent->mutex);
1251 result = usb_autopm_get_interface(serial->parent->interface);
1252 if (result < 0)
1253 goto err_out;
1254
1255 hso_dbg(0x1, "Opening %d\n", serial->minor);
1256
1257 /* setup */
1258 tty->driver_data = serial;
1259 tty_port_tty_set(&serial->port, tty);
1260
1261 /* check for port already opened, if not set the termios */
1262 serial->port.count++;
1263 if (serial->port.count == 1) {
1264 serial->rx_state = RX_IDLE;
1265 /* Force default termio settings */
1266 _hso_serial_set_termios(tty, NULL);
1267 tasklet_init(&serial->unthrottle_tasklet,
1268 (void (*)(unsigned long))hso_unthrottle_tasklet,
1269 (unsigned long)serial);
1270 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1271 if (result) {
1272 hso_stop_serial_device(serial->parent);
1273 serial->port.count--;
1274 } else {
1275 kref_get(&serial->parent->ref);
1276 }
1277 } else {
1278 hso_dbg(0x1, "Port was already open\n");
1279 }
1280
1281 usb_autopm_put_interface(serial->parent->interface);
1282
1283 /* done */
1284 if (result)
1285 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1286 err_out:
1287 mutex_unlock(&serial->parent->mutex);
1288 return result;
1289 }
1290
1291 /* close the requested serial port */
1292 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1293 {
1294 struct hso_serial *serial = tty->driver_data;
1295 u8 usb_gone;
1296
1297 hso_dbg(0x1, "Closing serial port\n");
1298
1299 /* Open failed, no close cleanup required */
1300 if (serial == NULL)
1301 return;
1302
1303 mutex_lock(&serial->parent->mutex);
1304 usb_gone = serial->parent->usb_gone;
1305
1306 if (!usb_gone)
1307 usb_autopm_get_interface(serial->parent->interface);
1308
1309 /* reset the rts and dtr */
1310 /* do the actual close */
1311 serial->port.count--;
1312
1313 if (serial->port.count <= 0) {
1314 serial->port.count = 0;
1315 tty_port_tty_set(&serial->port, NULL);
1316 if (!usb_gone)
1317 hso_stop_serial_device(serial->parent);
1318 tasklet_kill(&serial->unthrottle_tasklet);
1319 }
1320
1321 if (!usb_gone)
1322 usb_autopm_put_interface(serial->parent->interface);
1323
1324 mutex_unlock(&serial->parent->mutex);
1325 }
1326
1327 /* close the requested serial port */
1328 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1329 int count)
1330 {
1331 struct hso_serial *serial = tty->driver_data;
1332 int space, tx_bytes;
1333 unsigned long flags;
1334
1335 /* sanity check */
1336 if (serial == NULL) {
1337 pr_err("%s: serial is NULL\n", __func__);
1338 return -ENODEV;
1339 }
1340
1341 spin_lock_irqsave(&serial->serial_lock, flags);
1342
1343 space = serial->tx_data_length - serial->tx_buffer_count;
1344 tx_bytes = (count < space) ? count : space;
1345
1346 if (!tx_bytes)
1347 goto out;
1348
1349 memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1350 serial->tx_buffer_count += tx_bytes;
1351
1352 out:
1353 spin_unlock_irqrestore(&serial->serial_lock, flags);
1354
1355 hso_kick_transmit(serial);
1356 /* done */
1357 return tx_bytes;
1358 }
1359
1360 /* how much room is there for writing */
1361 static int hso_serial_write_room(struct tty_struct *tty)
1362 {
1363 struct hso_serial *serial = tty->driver_data;
1364 int room;
1365 unsigned long flags;
1366
1367 spin_lock_irqsave(&serial->serial_lock, flags);
1368 room = serial->tx_data_length - serial->tx_buffer_count;
1369 spin_unlock_irqrestore(&serial->serial_lock, flags);
1370
1371 /* return free room */
1372 return room;
1373 }
1374
1375 static void hso_serial_cleanup(struct tty_struct *tty)
1376 {
1377 struct hso_serial *serial = tty->driver_data;
1378
1379 if (!serial)
1380 return;
1381
1382 kref_put(&serial->parent->ref, hso_serial_ref_free);
1383 }
1384
1385 /* setup the term */
1386 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1387 {
1388 struct hso_serial *serial = tty->driver_data;
1389 unsigned long flags;
1390
1391 if (old)
1392 hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n",
1393 tty->termios.c_cflag, old->c_cflag);
1394
1395 /* the actual setup */
1396 spin_lock_irqsave(&serial->serial_lock, flags);
1397 if (serial->port.count)
1398 _hso_serial_set_termios(tty, old);
1399 else
1400 tty->termios = *old;
1401 spin_unlock_irqrestore(&serial->serial_lock, flags);
1402
1403 /* done */
1404 }
1405
1406 /* how many characters in the buffer */
1407 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1408 {
1409 struct hso_serial *serial = tty->driver_data;
1410 int chars;
1411 unsigned long flags;
1412
1413 /* sanity check */
1414 if (serial == NULL)
1415 return 0;
1416
1417 spin_lock_irqsave(&serial->serial_lock, flags);
1418 chars = serial->tx_buffer_count;
1419 spin_unlock_irqrestore(&serial->serial_lock, flags);
1420
1421 return chars;
1422 }
1423 static int tiocmget_submit_urb(struct hso_serial *serial,
1424 struct hso_tiocmget *tiocmget,
1425 struct usb_device *usb)
1426 {
1427 int result;
1428
1429 if (serial->parent->usb_gone)
1430 return -ENODEV;
1431 usb_fill_int_urb(tiocmget->urb, usb,
1432 usb_rcvintpipe(usb,
1433 tiocmget->endp->
1434 bEndpointAddress & 0x7F),
1435 &tiocmget->serial_state_notification,
1436 sizeof(struct hso_serial_state_notification),
1437 tiocmget_intr_callback, serial,
1438 tiocmget->endp->bInterval);
1439 result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1440 if (result) {
1441 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1442 result);
1443 }
1444 return result;
1445
1446 }
1447
1448 static void tiocmget_intr_callback(struct urb *urb)
1449 {
1450 struct hso_serial *serial = urb->context;
1451 struct hso_tiocmget *tiocmget;
1452 int status = urb->status;
1453 u16 UART_state_bitmap, prev_UART_state_bitmap;
1454 struct uart_icount *icount;
1455 struct hso_serial_state_notification *serial_state_notification;
1456 struct usb_device *usb;
1457 struct usb_interface *interface;
1458 int if_num;
1459
1460 /* Sanity checks */
1461 if (!serial)
1462 return;
1463 if (status) {
1464 handle_usb_error(status, __func__, serial->parent);
1465 return;
1466 }
1467
1468 /* tiocmget is only supported on HSO_PORT_MODEM */
1469 tiocmget = serial->tiocmget;
1470 if (!tiocmget)
1471 return;
1472 BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1473
1474 usb = serial->parent->usb;
1475 interface = serial->parent->interface;
1476
1477 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1478
1479 /* wIndex should be the USB interface number of the port to which the
1480 * notification applies, which should always be the Modem port.
1481 */
1482 serial_state_notification = &tiocmget->serial_state_notification;
1483 if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1484 serial_state_notification->bNotification != B_NOTIFICATION ||
1485 le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1486 le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1487 le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1488 dev_warn(&usb->dev,
1489 "hso received invalid serial state notification\n");
1490 DUMP(serial_state_notification,
1491 sizeof(struct hso_serial_state_notification));
1492 } else {
1493 unsigned long flags;
1494
1495 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1496 UART_state_bitmap);
1497 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1498 icount = &tiocmget->icount;
1499 spin_lock_irqsave(&serial->serial_lock, flags);
1500 if ((UART_state_bitmap & B_OVERRUN) !=
1501 (prev_UART_state_bitmap & B_OVERRUN))
1502 icount->parity++;
1503 if ((UART_state_bitmap & B_PARITY) !=
1504 (prev_UART_state_bitmap & B_PARITY))
1505 icount->parity++;
1506 if ((UART_state_bitmap & B_FRAMING) !=
1507 (prev_UART_state_bitmap & B_FRAMING))
1508 icount->frame++;
1509 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1510 !(prev_UART_state_bitmap & B_RING_SIGNAL))
1511 icount->rng++;
1512 if ((UART_state_bitmap & B_BREAK) !=
1513 (prev_UART_state_bitmap & B_BREAK))
1514 icount->brk++;
1515 if ((UART_state_bitmap & B_TX_CARRIER) !=
1516 (prev_UART_state_bitmap & B_TX_CARRIER))
1517 icount->dsr++;
1518 if ((UART_state_bitmap & B_RX_CARRIER) !=
1519 (prev_UART_state_bitmap & B_RX_CARRIER))
1520 icount->dcd++;
1521 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1522 spin_unlock_irqrestore(&serial->serial_lock, flags);
1523 tiocmget->intr_completed = 1;
1524 wake_up_interruptible(&tiocmget->waitq);
1525 }
1526 memset(serial_state_notification, 0,
1527 sizeof(struct hso_serial_state_notification));
1528 tiocmget_submit_urb(serial,
1529 tiocmget,
1530 serial->parent->usb);
1531 }
1532
1533 /*
1534 * next few functions largely stolen from drivers/serial/serial_core.c
1535 */
1536 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1537 * - mask passed in arg for lines of interest
1538 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1539 * Caller should use TIOCGICOUNT to see which one it was
1540 */
1541 static int
1542 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1543 {
1544 DECLARE_WAITQUEUE(wait, current);
1545 struct uart_icount cprev, cnow;
1546 struct hso_tiocmget *tiocmget;
1547 int ret;
1548
1549 tiocmget = serial->tiocmget;
1550 if (!tiocmget)
1551 return -ENOENT;
1552 /*
1553 * note the counters on entry
1554 */
1555 spin_lock_irq(&serial->serial_lock);
1556 memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1557 spin_unlock_irq(&serial->serial_lock);
1558 add_wait_queue(&tiocmget->waitq, &wait);
1559 for (;;) {
1560 spin_lock_irq(&serial->serial_lock);
1561 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1562 spin_unlock_irq(&serial->serial_lock);
1563 set_current_state(TASK_INTERRUPTIBLE);
1564 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1565 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1566 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
1567 ret = 0;
1568 break;
1569 }
1570 schedule();
1571 /* see if a signal did it */
1572 if (signal_pending(current)) {
1573 ret = -ERESTARTSYS;
1574 break;
1575 }
1576 cprev = cnow;
1577 }
1578 __set_current_state(TASK_RUNNING);
1579 remove_wait_queue(&tiocmget->waitq, &wait);
1580
1581 return ret;
1582 }
1583
1584 /*
1585 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1586 * Return: write counters to the user passed counter struct
1587 * NB: both 1->0 and 0->1 transitions are counted except for
1588 * RI where only 0->1 is counted.
1589 */
1590 static int hso_get_count(struct tty_struct *tty,
1591 struct serial_icounter_struct *icount)
1592 {
1593 struct uart_icount cnow;
1594 struct hso_serial *serial = tty->driver_data;
1595 struct hso_tiocmget *tiocmget = serial->tiocmget;
1596
1597 memset(icount, 0, sizeof(struct serial_icounter_struct));
1598
1599 if (!tiocmget)
1600 return -ENOENT;
1601 spin_lock_irq(&serial->serial_lock);
1602 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1603 spin_unlock_irq(&serial->serial_lock);
1604
1605 icount->cts = cnow.cts;
1606 icount->dsr = cnow.dsr;
1607 icount->rng = cnow.rng;
1608 icount->dcd = cnow.dcd;
1609 icount->rx = cnow.rx;
1610 icount->tx = cnow.tx;
1611 icount->frame = cnow.frame;
1612 icount->overrun = cnow.overrun;
1613 icount->parity = cnow.parity;
1614 icount->brk = cnow.brk;
1615 icount->buf_overrun = cnow.buf_overrun;
1616
1617 return 0;
1618 }
1619
1620
1621 static int hso_serial_tiocmget(struct tty_struct *tty)
1622 {
1623 int retval;
1624 struct hso_serial *serial = tty->driver_data;
1625 struct hso_tiocmget *tiocmget;
1626 u16 UART_state_bitmap;
1627
1628 /* sanity check */
1629 if (!serial) {
1630 hso_dbg(0x1, "no tty structures\n");
1631 return -EINVAL;
1632 }
1633 spin_lock_irq(&serial->serial_lock);
1634 retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1635 ((serial->dtr_state) ? TIOCM_DTR : 0);
1636 tiocmget = serial->tiocmget;
1637 if (tiocmget) {
1638
1639 UART_state_bitmap = le16_to_cpu(
1640 tiocmget->prev_UART_state_bitmap);
1641 if (UART_state_bitmap & B_RING_SIGNAL)
1642 retval |= TIOCM_RNG;
1643 if (UART_state_bitmap & B_RX_CARRIER)
1644 retval |= TIOCM_CD;
1645 if (UART_state_bitmap & B_TX_CARRIER)
1646 retval |= TIOCM_DSR;
1647 }
1648 spin_unlock_irq(&serial->serial_lock);
1649 return retval;
1650 }
1651
1652 static int hso_serial_tiocmset(struct tty_struct *tty,
1653 unsigned int set, unsigned int clear)
1654 {
1655 int val = 0;
1656 unsigned long flags;
1657 int if_num;
1658 struct hso_serial *serial = tty->driver_data;
1659 struct usb_interface *interface;
1660
1661 /* sanity check */
1662 if (!serial) {
1663 hso_dbg(0x1, "no tty structures\n");
1664 return -EINVAL;
1665 }
1666
1667 if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1668 return -EINVAL;
1669
1670 interface = serial->parent->interface;
1671 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1672
1673 spin_lock_irqsave(&serial->serial_lock, flags);
1674 if (set & TIOCM_RTS)
1675 serial->rts_state = 1;
1676 if (set & TIOCM_DTR)
1677 serial->dtr_state = 1;
1678
1679 if (clear & TIOCM_RTS)
1680 serial->rts_state = 0;
1681 if (clear & TIOCM_DTR)
1682 serial->dtr_state = 0;
1683
1684 if (serial->dtr_state)
1685 val |= 0x01;
1686 if (serial->rts_state)
1687 val |= 0x02;
1688
1689 spin_unlock_irqrestore(&serial->serial_lock, flags);
1690
1691 return usb_control_msg(serial->parent->usb,
1692 usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
1693 0x21, val, if_num, NULL, 0,
1694 USB_CTRL_SET_TIMEOUT);
1695 }
1696
1697 static int hso_serial_ioctl(struct tty_struct *tty,
1698 unsigned int cmd, unsigned long arg)
1699 {
1700 struct hso_serial *serial = tty->driver_data;
1701 int ret = 0;
1702 hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1703
1704 if (!serial)
1705 return -ENODEV;
1706 switch (cmd) {
1707 case TIOCMIWAIT:
1708 ret = hso_wait_modem_status(serial, arg);
1709 break;
1710 default:
1711 ret = -ENOIOCTLCMD;
1712 break;
1713 }
1714 return ret;
1715 }
1716
1717
1718 /* starts a transmit */
1719 static void hso_kick_transmit(struct hso_serial *serial)
1720 {
1721 unsigned long flags;
1722 int res;
1723
1724 spin_lock_irqsave(&serial->serial_lock, flags);
1725 if (!serial->tx_buffer_count)
1726 goto out;
1727
1728 if (serial->tx_urb_used)
1729 goto out;
1730
1731 /* Wakeup USB interface if necessary */
1732 if (hso_get_activity(serial->parent) == -EAGAIN)
1733 goto out;
1734
1735 /* Switch pointers around to avoid memcpy */
1736 swap(serial->tx_buffer, serial->tx_data);
1737 serial->tx_data_count = serial->tx_buffer_count;
1738 serial->tx_buffer_count = 0;
1739
1740 /* If serial->tx_data is set, it means we switched buffers */
1741 if (serial->tx_data && serial->write_data) {
1742 res = serial->write_data(serial);
1743 if (res >= 0)
1744 serial->tx_urb_used = 1;
1745 }
1746 out:
1747 spin_unlock_irqrestore(&serial->serial_lock, flags);
1748 }
1749
1750 /* make a request (for reading and writing data to muxed serial port) */
1751 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1752 struct urb *ctrl_urb,
1753 struct usb_ctrlrequest *ctrl_req,
1754 u8 *ctrl_urb_data, u32 size)
1755 {
1756 int result;
1757 int pipe;
1758
1759 /* Sanity check */
1760 if (!serial || !ctrl_urb || !ctrl_req) {
1761 pr_err("%s: Wrong arguments\n", __func__);
1762 return -EINVAL;
1763 }
1764
1765 /* initialize */
1766 ctrl_req->wValue = 0;
1767 ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1768 ctrl_req->wLength = cpu_to_le16(size);
1769
1770 if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1771 /* Reading command */
1772 ctrl_req->bRequestType = USB_DIR_IN |
1773 USB_TYPE_OPTION_VENDOR |
1774 USB_RECIP_INTERFACE;
1775 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1776 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1777 } else {
1778 /* Writing command */
1779 ctrl_req->bRequestType = USB_DIR_OUT |
1780 USB_TYPE_OPTION_VENDOR |
1781 USB_RECIP_INTERFACE;
1782 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1783 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1784 }
1785 /* syslog */
1786 hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1787 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1788 ctrl_req->bRequestType, ctrl_req->wLength, port);
1789
1790 /* Load ctrl urb */
1791 ctrl_urb->transfer_flags = 0;
1792 usb_fill_control_urb(ctrl_urb,
1793 serial->parent->usb,
1794 pipe,
1795 (u8 *) ctrl_req,
1796 ctrl_urb_data, size, ctrl_callback, serial);
1797 /* Send it on merry way */
1798 result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1799 if (result) {
1800 dev_err(&ctrl_urb->dev->dev,
1801 "%s failed submit ctrl_urb %d type %d\n", __func__,
1802 result, type);
1803 return result;
1804 }
1805
1806 /* done */
1807 return size;
1808 }
1809
1810 /* called by intr_callback when read occurs */
1811 static int hso_mux_serial_read(struct hso_serial *serial)
1812 {
1813 if (!serial)
1814 return -EINVAL;
1815
1816 /* clean data */
1817 memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1818 /* make the request */
1819
1820 if (serial->num_rx_urbs != 1) {
1821 dev_err(&serial->parent->interface->dev,
1822 "ERROR: mux'd reads with multiple buffers "
1823 "not possible\n");
1824 return 0;
1825 }
1826 return mux_device_request(serial,
1827 USB_CDC_GET_ENCAPSULATED_RESPONSE,
1828 serial->parent->port_spec & HSO_PORT_MASK,
1829 serial->rx_urb[0],
1830 &serial->ctrl_req_rx,
1831 serial->rx_data[0], serial->rx_data_length);
1832 }
1833
1834 /* used for muxed serial port callback (muxed serial read) */
1835 static void intr_callback(struct urb *urb)
1836 {
1837 struct hso_shared_int *shared_int = urb->context;
1838 struct hso_serial *serial;
1839 unsigned char *port_req;
1840 int status = urb->status;
1841 unsigned long flags;
1842 int i;
1843
1844 usb_mark_last_busy(urb->dev);
1845
1846 /* sanity check */
1847 if (!shared_int)
1848 return;
1849
1850 /* status check */
1851 if (status) {
1852 handle_usb_error(status, __func__, NULL);
1853 return;
1854 }
1855 hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1856
1857 /* what request? */
1858 port_req = urb->transfer_buffer;
1859 hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1860 /* loop over all muxed ports to find the one sending this */
1861 for (i = 0; i < 8; i++) {
1862 /* max 8 channels on MUX */
1863 if (*port_req & (1 << i)) {
1864 serial = get_serial_by_shared_int_and_type(shared_int,
1865 (1 << i));
1866 if (serial != NULL) {
1867 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1868 i);
1869 spin_lock_irqsave(&serial->serial_lock, flags);
1870 if (serial->rx_state == RX_IDLE &&
1871 serial->port.count > 0) {
1872 /* Setup and send a ctrl req read on
1873 * port i */
1874 if (!serial->rx_urb_filled[0]) {
1875 serial->rx_state = RX_SENT;
1876 hso_mux_serial_read(serial);
1877 } else
1878 serial->rx_state = RX_PENDING;
1879 } else {
1880 hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1881 i);
1882 }
1883 spin_unlock_irqrestore(&serial->serial_lock,
1884 flags);
1885 }
1886 }
1887 }
1888 /* Resubmit interrupt urb */
1889 hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1890 }
1891
1892 /* called for writing to muxed serial port */
1893 static int hso_mux_serial_write_data(struct hso_serial *serial)
1894 {
1895 if (NULL == serial)
1896 return -EINVAL;
1897
1898 return mux_device_request(serial,
1899 USB_CDC_SEND_ENCAPSULATED_COMMAND,
1900 serial->parent->port_spec & HSO_PORT_MASK,
1901 serial->tx_urb,
1902 &serial->ctrl_req_tx,
1903 serial->tx_data, serial->tx_data_count);
1904 }
1905
1906 /* write callback for Diag and CS port */
1907 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1908 {
1909 struct hso_serial *serial = urb->context;
1910 int status = urb->status;
1911 unsigned long flags;
1912
1913 /* sanity check */
1914 if (!serial) {
1915 hso_dbg(0x1, "serial == NULL\n");
1916 return;
1917 }
1918
1919 spin_lock_irqsave(&serial->serial_lock, flags);
1920 serial->tx_urb_used = 0;
1921 spin_unlock_irqrestore(&serial->serial_lock, flags);
1922 if (status) {
1923 handle_usb_error(status, __func__, serial->parent);
1924 return;
1925 }
1926 hso_put_activity(serial->parent);
1927 tty_port_tty_wakeup(&serial->port);
1928 hso_kick_transmit(serial);
1929
1930 hso_dbg(0x1, "\n");
1931 }
1932
1933 /* called for writing diag or CS serial port */
1934 static int hso_std_serial_write_data(struct hso_serial *serial)
1935 {
1936 int count = serial->tx_data_count;
1937 int result;
1938
1939 usb_fill_bulk_urb(serial->tx_urb,
1940 serial->parent->usb,
1941 usb_sndbulkpipe(serial->parent->usb,
1942 serial->out_endp->
1943 bEndpointAddress & 0x7F),
1944 serial->tx_data, serial->tx_data_count,
1945 hso_std_serial_write_bulk_callback, serial);
1946
1947 result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1948 if (result) {
1949 dev_warn(&serial->parent->usb->dev,
1950 "Failed to submit urb - res %d\n", result);
1951 return result;
1952 }
1953
1954 return count;
1955 }
1956
1957 /* callback after read or write on muxed serial port */
1958 static void ctrl_callback(struct urb *urb)
1959 {
1960 struct hso_serial *serial = urb->context;
1961 struct usb_ctrlrequest *req;
1962 int status = urb->status;
1963 unsigned long flags;
1964
1965 /* sanity check */
1966 if (!serial)
1967 return;
1968
1969 spin_lock_irqsave(&serial->serial_lock, flags);
1970 serial->tx_urb_used = 0;
1971 spin_unlock_irqrestore(&serial->serial_lock, flags);
1972 if (status) {
1973 handle_usb_error(status, __func__, serial->parent);
1974 return;
1975 }
1976
1977 /* what request? */
1978 req = (struct usb_ctrlrequest *)(urb->setup_packet);
1979 hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1980 hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1981 DUMP1(urb->transfer_buffer, urb->actual_length);
1982
1983 if (req->bRequestType ==
1984 (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1985 /* response to a read command */
1986 serial->rx_urb_filled[0] = 1;
1987 spin_lock_irqsave(&serial->serial_lock, flags);
1988 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1989 spin_unlock_irqrestore(&serial->serial_lock, flags);
1990 } else {
1991 hso_put_activity(serial->parent);
1992 tty_port_tty_wakeup(&serial->port);
1993 /* response to a write command */
1994 hso_kick_transmit(serial);
1995 }
1996 }
1997
1998 /* handle RX data for serial port */
1999 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2000 {
2001 struct tty_struct *tty;
2002 int count;
2003
2004 /* Sanity check */
2005 if (urb == NULL || serial == NULL) {
2006 hso_dbg(0x1, "serial = NULL\n");
2007 return -2;
2008 }
2009
2010 tty = tty_port_tty_get(&serial->port);
2011
2012 if (tty && tty_throttled(tty)) {
2013 tty_kref_put(tty);
2014 return -1;
2015 }
2016
2017 /* Push data to tty */
2018 hso_dbg(0x1, "data to push to tty\n");
2019 count = tty_buffer_request_room(&serial->port, urb->actual_length);
2020 if (count >= urb->actual_length) {
2021 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2022 urb->actual_length);
2023 tty_flip_buffer_push(&serial->port);
2024 } else {
2025 dev_warn(&serial->parent->usb->dev,
2026 "dropping data, %d bytes lost\n", urb->actual_length);
2027 }
2028
2029 tty_kref_put(tty);
2030
2031 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2032
2033 return 0;
2034 }
2035
2036
2037 /* Base driver functions */
2038
2039 static void hso_log_port(struct hso_device *hso_dev)
2040 {
2041 char *port_type;
2042 char port_dev[20];
2043
2044 switch (hso_dev->port_spec & HSO_PORT_MASK) {
2045 case HSO_PORT_CONTROL:
2046 port_type = "Control";
2047 break;
2048 case HSO_PORT_APP:
2049 port_type = "Application";
2050 break;
2051 case HSO_PORT_GPS:
2052 port_type = "GPS";
2053 break;
2054 case HSO_PORT_GPS_CONTROL:
2055 port_type = "GPS control";
2056 break;
2057 case HSO_PORT_APP2:
2058 port_type = "Application2";
2059 break;
2060 case HSO_PORT_PCSC:
2061 port_type = "PCSC";
2062 break;
2063 case HSO_PORT_DIAG:
2064 port_type = "Diagnostic";
2065 break;
2066 case HSO_PORT_DIAG2:
2067 port_type = "Diagnostic2";
2068 break;
2069 case HSO_PORT_MODEM:
2070 port_type = "Modem";
2071 break;
2072 case HSO_PORT_NETWORK:
2073 port_type = "Network";
2074 break;
2075 default:
2076 port_type = "Unknown";
2077 break;
2078 }
2079 if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2080 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2081 } else
2082 sprintf(port_dev, "/dev/%s%d", tty_filename,
2083 dev2ser(hso_dev)->minor);
2084
2085 dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2086 port_type, port_dev);
2087 }
2088
2089 static int hso_start_net_device(struct hso_device *hso_dev)
2090 {
2091 int i, result = 0;
2092 struct hso_net *hso_net = dev2net(hso_dev);
2093
2094 if (!hso_net)
2095 return -ENODEV;
2096
2097 /* send URBs for all read buffers */
2098 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2099
2100 /* Prep a receive URB */
2101 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2102 hso_dev->usb,
2103 usb_rcvbulkpipe(hso_dev->usb,
2104 hso_net->in_endp->
2105 bEndpointAddress & 0x7F),
2106 hso_net->mux_bulk_rx_buf_pool[i],
2107 MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2108 hso_net);
2109
2110 /* Put it out there so the device can send us stuff */
2111 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2112 GFP_NOIO);
2113 if (result)
2114 dev_warn(&hso_dev->usb->dev,
2115 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2116 i, result);
2117 }
2118
2119 return result;
2120 }
2121
2122 static int hso_stop_net_device(struct hso_device *hso_dev)
2123 {
2124 int i;
2125 struct hso_net *hso_net = dev2net(hso_dev);
2126
2127 if (!hso_net)
2128 return -ENODEV;
2129
2130 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2131 if (hso_net->mux_bulk_rx_urb_pool[i])
2132 usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2133
2134 }
2135 if (hso_net->mux_bulk_tx_urb)
2136 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2137
2138 return 0;
2139 }
2140
2141 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2142 {
2143 int i, result = 0;
2144 struct hso_serial *serial = dev2ser(hso_dev);
2145
2146 if (!serial)
2147 return -ENODEV;
2148
2149 /* If it is not the MUX port fill in and submit a bulk urb (already
2150 * allocated in hso_serial_start) */
2151 if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2152 for (i = 0; i < serial->num_rx_urbs; i++) {
2153 usb_fill_bulk_urb(serial->rx_urb[i],
2154 serial->parent->usb,
2155 usb_rcvbulkpipe(serial->parent->usb,
2156 serial->in_endp->
2157 bEndpointAddress &
2158 0x7F),
2159 serial->rx_data[i],
2160 serial->rx_data_length,
2161 hso_std_serial_read_bulk_callback,
2162 serial);
2163 result = usb_submit_urb(serial->rx_urb[i], flags);
2164 if (result) {
2165 dev_warn(&serial->parent->usb->dev,
2166 "Failed to submit urb - res %d\n",
2167 result);
2168 break;
2169 }
2170 }
2171 } else {
2172 mutex_lock(&serial->shared_int->shared_int_lock);
2173 if (!serial->shared_int->use_count) {
2174 result =
2175 hso_mux_submit_intr_urb(serial->shared_int,
2176 hso_dev->usb, flags);
2177 }
2178 serial->shared_int->use_count++;
2179 mutex_unlock(&serial->shared_int->shared_int_lock);
2180 }
2181 if (serial->tiocmget)
2182 tiocmget_submit_urb(serial,
2183 serial->tiocmget,
2184 serial->parent->usb);
2185 return result;
2186 }
2187
2188 static int hso_stop_serial_device(struct hso_device *hso_dev)
2189 {
2190 int i;
2191 struct hso_serial *serial = dev2ser(hso_dev);
2192 struct hso_tiocmget *tiocmget;
2193
2194 if (!serial)
2195 return -ENODEV;
2196
2197 for (i = 0; i < serial->num_rx_urbs; i++) {
2198 if (serial->rx_urb[i]) {
2199 usb_kill_urb(serial->rx_urb[i]);
2200 serial->rx_urb_filled[i] = 0;
2201 }
2202 }
2203 serial->curr_rx_urb_idx = 0;
2204
2205 if (serial->tx_urb)
2206 usb_kill_urb(serial->tx_urb);
2207
2208 if (serial->shared_int) {
2209 mutex_lock(&serial->shared_int->shared_int_lock);
2210 if (serial->shared_int->use_count &&
2211 (--serial->shared_int->use_count == 0)) {
2212 struct urb *urb;
2213
2214 urb = serial->shared_int->shared_intr_urb;
2215 if (urb)
2216 usb_kill_urb(urb);
2217 }
2218 mutex_unlock(&serial->shared_int->shared_int_lock);
2219 }
2220 tiocmget = serial->tiocmget;
2221 if (tiocmget) {
2222 wake_up_interruptible(&tiocmget->waitq);
2223 usb_kill_urb(tiocmget->urb);
2224 }
2225
2226 return 0;
2227 }
2228
2229 static void hso_serial_tty_unregister(struct hso_serial *serial)
2230 {
2231 tty_unregister_device(tty_drv, serial->minor);
2232 }
2233
2234 static void hso_serial_common_free(struct hso_serial *serial)
2235 {
2236 int i;
2237
2238 for (i = 0; i < serial->num_rx_urbs; i++) {
2239 /* unlink and free RX URB */
2240 usb_free_urb(serial->rx_urb[i]);
2241 /* free the RX buffer */
2242 kfree(serial->rx_data[i]);
2243 }
2244
2245 /* unlink and free TX URB */
2246 usb_free_urb(serial->tx_urb);
2247 kfree(serial->tx_buffer);
2248 kfree(serial->tx_data);
2249 tty_port_destroy(&serial->port);
2250 }
2251
2252 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2253 int rx_size, int tx_size)
2254 {
2255 int minor;
2256 int i;
2257
2258 tty_port_init(&serial->port);
2259
2260 minor = get_free_serial_index();
2261 if (minor < 0)
2262 goto exit;
2263
2264 /* register our minor number */
2265 serial->parent->dev = tty_port_register_device_attr(&serial->port,
2266 tty_drv, minor, &serial->parent->interface->dev,
2267 serial->parent, hso_serial_dev_groups);
2268
2269 /* fill in specific data for later use */
2270 serial->minor = minor;
2271 serial->magic = HSO_SERIAL_MAGIC;
2272 spin_lock_init(&serial->serial_lock);
2273 serial->num_rx_urbs = num_urbs;
2274
2275 /* RX, allocate urb and initialize */
2276
2277 /* prepare our RX buffer */
2278 serial->rx_data_length = rx_size;
2279 for (i = 0; i < serial->num_rx_urbs; i++) {
2280 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2281 if (!serial->rx_urb[i])
2282 goto exit;
2283 serial->rx_urb[i]->transfer_buffer = NULL;
2284 serial->rx_urb[i]->transfer_buffer_length = 0;
2285 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2286 GFP_KERNEL);
2287 if (!serial->rx_data[i])
2288 goto exit;
2289 }
2290
2291 /* TX, allocate urb and initialize */
2292 serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2293 if (!serial->tx_urb)
2294 goto exit;
2295 serial->tx_urb->transfer_buffer = NULL;
2296 serial->tx_urb->transfer_buffer_length = 0;
2297 /* prepare our TX buffer */
2298 serial->tx_data_count = 0;
2299 serial->tx_buffer_count = 0;
2300 serial->tx_data_length = tx_size;
2301 serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2302 if (!serial->tx_data)
2303 goto exit;
2304
2305 serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2306 if (!serial->tx_buffer)
2307 goto exit;
2308
2309 return 0;
2310 exit:
2311 hso_serial_tty_unregister(serial);
2312 hso_serial_common_free(serial);
2313 return -1;
2314 }
2315
2316 /* Creates a general hso device */
2317 static struct hso_device *hso_create_device(struct usb_interface *intf,
2318 int port_spec)
2319 {
2320 struct hso_device *hso_dev;
2321
2322 hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2323 if (!hso_dev)
2324 return NULL;
2325
2326 hso_dev->port_spec = port_spec;
2327 hso_dev->usb = interface_to_usbdev(intf);
2328 hso_dev->interface = intf;
2329 kref_init(&hso_dev->ref);
2330 mutex_init(&hso_dev->mutex);
2331
2332 INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2333 INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2334
2335 return hso_dev;
2336 }
2337
2338 /* Removes a network device in the network device table */
2339 static int remove_net_device(struct hso_device *hso_dev)
2340 {
2341 int i;
2342
2343 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2344 if (network_table[i] == hso_dev) {
2345 network_table[i] = NULL;
2346 break;
2347 }
2348 }
2349 if (i == HSO_MAX_NET_DEVICES)
2350 return -1;
2351 return 0;
2352 }
2353
2354 /* Frees our network device */
2355 static void hso_free_net_device(struct hso_device *hso_dev)
2356 {
2357 int i;
2358 struct hso_net *hso_net = dev2net(hso_dev);
2359
2360 if (!hso_net)
2361 return;
2362
2363 remove_net_device(hso_net->parent);
2364
2365 if (hso_net->net)
2366 unregister_netdev(hso_net->net);
2367
2368 /* start freeing */
2369 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2370 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2371 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2372 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2373 }
2374 usb_free_urb(hso_net->mux_bulk_tx_urb);
2375 kfree(hso_net->mux_bulk_tx_buf);
2376 hso_net->mux_bulk_tx_buf = NULL;
2377
2378 if (hso_net->net)
2379 free_netdev(hso_net->net);
2380
2381 kfree(hso_dev);
2382 }
2383
2384 static const struct net_device_ops hso_netdev_ops = {
2385 .ndo_open = hso_net_open,
2386 .ndo_stop = hso_net_close,
2387 .ndo_start_xmit = hso_net_start_xmit,
2388 .ndo_tx_timeout = hso_net_tx_timeout,
2389 };
2390
2391 /* initialize the network interface */
2392 static void hso_net_init(struct net_device *net)
2393 {
2394 struct hso_net *hso_net = netdev_priv(net);
2395
2396 hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2397
2398 /* fill in the other fields */
2399 net->netdev_ops = &hso_netdev_ops;
2400 net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2401 net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2402 net->type = ARPHRD_NONE;
2403 net->mtu = DEFAULT_MTU - 14;
2404 net->tx_queue_len = 10;
2405 net->ethtool_ops = &ops;
2406
2407 /* and initialize the semaphore */
2408 spin_lock_init(&hso_net->net_lock);
2409 }
2410
2411 /* Adds a network device in the network device table */
2412 static int add_net_device(struct hso_device *hso_dev)
2413 {
2414 int i;
2415
2416 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2417 if (network_table[i] == NULL) {
2418 network_table[i] = hso_dev;
2419 break;
2420 }
2421 }
2422 if (i == HSO_MAX_NET_DEVICES)
2423 return -1;
2424 return 0;
2425 }
2426
2427 static int hso_rfkill_set_block(void *data, bool blocked)
2428 {
2429 struct hso_device *hso_dev = data;
2430 int enabled = !blocked;
2431 int rv;
2432
2433 mutex_lock(&hso_dev->mutex);
2434 if (hso_dev->usb_gone)
2435 rv = 0;
2436 else
2437 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
2438 enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2439 USB_CTRL_SET_TIMEOUT);
2440 mutex_unlock(&hso_dev->mutex);
2441 return rv;
2442 }
2443
2444 static const struct rfkill_ops hso_rfkill_ops = {
2445 .set_block = hso_rfkill_set_block,
2446 };
2447
2448 /* Creates and sets up everything for rfkill */
2449 static void hso_create_rfkill(struct hso_device *hso_dev,
2450 struct usb_interface *interface)
2451 {
2452 struct hso_net *hso_net = dev2net(hso_dev);
2453 struct device *dev = &hso_net->net->dev;
2454 static u32 rfkill_counter;
2455
2456 snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2457 rfkill_counter++);
2458
2459 hso_net->rfkill = rfkill_alloc(hso_net->name,
2460 &interface_to_usbdev(interface)->dev,
2461 RFKILL_TYPE_WWAN,
2462 &hso_rfkill_ops, hso_dev);
2463 if (!hso_net->rfkill) {
2464 dev_err(dev, "%s - Out of memory\n", __func__);
2465 return;
2466 }
2467 if (rfkill_register(hso_net->rfkill) < 0) {
2468 rfkill_destroy(hso_net->rfkill);
2469 hso_net->rfkill = NULL;
2470 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2471 return;
2472 }
2473 }
2474
2475 static struct device_type hso_type = {
2476 .name = "wwan",
2477 };
2478
2479 /* Creates our network device */
2480 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2481 int port_spec)
2482 {
2483 int result, i;
2484 struct net_device *net;
2485 struct hso_net *hso_net;
2486 struct hso_device *hso_dev;
2487
2488 hso_dev = hso_create_device(interface, port_spec);
2489 if (!hso_dev)
2490 return NULL;
2491
2492 /* allocate our network device, then we can put in our private data */
2493 /* call hso_net_init to do the basic initialization */
2494 net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2495 hso_net_init);
2496 if (!net) {
2497 dev_err(&interface->dev, "Unable to create ethernet device\n");
2498 goto exit;
2499 }
2500
2501 hso_net = netdev_priv(net);
2502
2503 hso_dev->port_data.dev_net = hso_net;
2504 hso_net->net = net;
2505 hso_net->parent = hso_dev;
2506
2507 hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2508 USB_DIR_IN);
2509 if (!hso_net->in_endp) {
2510 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2511 goto exit;
2512 }
2513 hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2514 USB_DIR_OUT);
2515 if (!hso_net->out_endp) {
2516 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2517 goto exit;
2518 }
2519 SET_NETDEV_DEV(net, &interface->dev);
2520 SET_NETDEV_DEVTYPE(net, &hso_type);
2521
2522 /* start allocating */
2523 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2524 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2525 if (!hso_net->mux_bulk_rx_urb_pool[i])
2526 goto exit;
2527 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2528 GFP_KERNEL);
2529 if (!hso_net->mux_bulk_rx_buf_pool[i])
2530 goto exit;
2531 }
2532 hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2533 if (!hso_net->mux_bulk_tx_urb)
2534 goto exit;
2535 hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2536 if (!hso_net->mux_bulk_tx_buf)
2537 goto exit;
2538
2539 add_net_device(hso_dev);
2540
2541 /* registering our net device */
2542 result = register_netdev(net);
2543 if (result) {
2544 dev_err(&interface->dev, "Failed to register device\n");
2545 goto exit;
2546 }
2547
2548 hso_log_port(hso_dev);
2549
2550 hso_create_rfkill(hso_dev, interface);
2551
2552 return hso_dev;
2553 exit:
2554 hso_free_net_device(hso_dev);
2555 return NULL;
2556 }
2557
2558 static void hso_free_tiomget(struct hso_serial *serial)
2559 {
2560 struct hso_tiocmget *tiocmget;
2561 if (!serial)
2562 return;
2563 tiocmget = serial->tiocmget;
2564 if (tiocmget) {
2565 usb_free_urb(tiocmget->urb);
2566 tiocmget->urb = NULL;
2567 serial->tiocmget = NULL;
2568 kfree(tiocmget);
2569 }
2570 }
2571
2572 /* Frees an AT channel ( goes for both mux and non-mux ) */
2573 static void hso_free_serial_device(struct hso_device *hso_dev)
2574 {
2575 struct hso_serial *serial = dev2ser(hso_dev);
2576
2577 if (!serial)
2578 return;
2579
2580 hso_serial_common_free(serial);
2581
2582 if (serial->shared_int) {
2583 mutex_lock(&serial->shared_int->shared_int_lock);
2584 if (--serial->shared_int->ref_count == 0)
2585 hso_free_shared_int(serial->shared_int);
2586 else
2587 mutex_unlock(&serial->shared_int->shared_int_lock);
2588 }
2589 hso_free_tiomget(serial);
2590 kfree(serial);
2591 kfree(hso_dev);
2592 }
2593
2594 /* Creates a bulk AT channel */
2595 static struct hso_device *hso_create_bulk_serial_device(
2596 struct usb_interface *interface, int port)
2597 {
2598 struct hso_device *hso_dev;
2599 struct hso_serial *serial;
2600 int num_urbs;
2601 struct hso_tiocmget *tiocmget;
2602
2603 hso_dev = hso_create_device(interface, port);
2604 if (!hso_dev)
2605 return NULL;
2606
2607 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2608 if (!serial)
2609 goto exit;
2610
2611 serial->parent = hso_dev;
2612 hso_dev->port_data.dev_serial = serial;
2613
2614 if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2615 num_urbs = 2;
2616 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2617 GFP_KERNEL);
2618 /* it isn't going to break our heart if serial->tiocmget
2619 * allocation fails don't bother checking this.
2620 */
2621 if (serial->tiocmget) {
2622 tiocmget = serial->tiocmget;
2623 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2624 if (tiocmget->urb) {
2625 mutex_init(&tiocmget->mutex);
2626 init_waitqueue_head(&tiocmget->waitq);
2627 tiocmget->endp = hso_get_ep(
2628 interface,
2629 USB_ENDPOINT_XFER_INT,
2630 USB_DIR_IN);
2631 } else
2632 hso_free_tiomget(serial);
2633 }
2634 }
2635 else
2636 num_urbs = 1;
2637
2638 if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2639 BULK_URB_TX_SIZE))
2640 goto exit;
2641
2642 serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2643 USB_DIR_IN);
2644 if (!serial->in_endp) {
2645 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2646 goto exit2;
2647 }
2648
2649 if (!
2650 (serial->out_endp =
2651 hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2652 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2653 goto exit2;
2654 }
2655
2656 serial->write_data = hso_std_serial_write_data;
2657
2658 /* and record this serial */
2659 set_serial_by_index(serial->minor, serial);
2660
2661 /* setup the proc dirs and files if needed */
2662 hso_log_port(hso_dev);
2663
2664 /* done, return it */
2665 return hso_dev;
2666
2667 exit2:
2668 hso_serial_tty_unregister(serial);
2669 hso_serial_common_free(serial);
2670 exit:
2671 hso_free_tiomget(serial);
2672 kfree(serial);
2673 kfree(hso_dev);
2674 return NULL;
2675 }
2676
2677 /* Creates a multiplexed AT channel */
2678 static
2679 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2680 int port,
2681 struct hso_shared_int *mux)
2682 {
2683 struct hso_device *hso_dev;
2684 struct hso_serial *serial;
2685 int port_spec;
2686
2687 port_spec = HSO_INTF_MUX;
2688 port_spec &= ~HSO_PORT_MASK;
2689
2690 port_spec |= hso_mux_to_port(port);
2691 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2692 return NULL;
2693
2694 hso_dev = hso_create_device(interface, port_spec);
2695 if (!hso_dev)
2696 return NULL;
2697
2698 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2699 if (!serial)
2700 goto exit;
2701
2702 hso_dev->port_data.dev_serial = serial;
2703 serial->parent = hso_dev;
2704
2705 if (hso_serial_common_create
2706 (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2707 goto exit;
2708
2709 serial->tx_data_length--;
2710 serial->write_data = hso_mux_serial_write_data;
2711
2712 serial->shared_int = mux;
2713 mutex_lock(&serial->shared_int->shared_int_lock);
2714 serial->shared_int->ref_count++;
2715 mutex_unlock(&serial->shared_int->shared_int_lock);
2716
2717 /* and record this serial */
2718 set_serial_by_index(serial->minor, serial);
2719
2720 /* setup the proc dirs and files if needed */
2721 hso_log_port(hso_dev);
2722
2723 /* done, return it */
2724 return hso_dev;
2725
2726 exit:
2727 if (serial) {
2728 tty_unregister_device(tty_drv, serial->minor);
2729 kfree(serial);
2730 }
2731 kfree(hso_dev);
2732 return NULL;
2733
2734 }
2735
2736 static void hso_free_shared_int(struct hso_shared_int *mux)
2737 {
2738 usb_free_urb(mux->shared_intr_urb);
2739 kfree(mux->shared_intr_buf);
2740 mutex_unlock(&mux->shared_int_lock);
2741 kfree(mux);
2742 }
2743
2744 static
2745 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2746 {
2747 struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2748
2749 if (!mux)
2750 return NULL;
2751
2752 mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2753 USB_DIR_IN);
2754 if (!mux->intr_endp) {
2755 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2756 goto exit;
2757 }
2758
2759 mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2760 if (!mux->shared_intr_urb)
2761 goto exit;
2762 mux->shared_intr_buf =
2763 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2764 GFP_KERNEL);
2765 if (!mux->shared_intr_buf)
2766 goto exit;
2767
2768 mutex_init(&mux->shared_int_lock);
2769
2770 return mux;
2771
2772 exit:
2773 kfree(mux->shared_intr_buf);
2774 usb_free_urb(mux->shared_intr_urb);
2775 kfree(mux);
2776 return NULL;
2777 }
2778
2779 /* Gets the port spec for a certain interface */
2780 static int hso_get_config_data(struct usb_interface *interface)
2781 {
2782 struct usb_device *usbdev = interface_to_usbdev(interface);
2783 u8 *config_data = kmalloc(17, GFP_KERNEL);
2784 u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2785 s32 result;
2786
2787 if (!config_data)
2788 return -ENOMEM;
2789 if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2790 0x86, 0xC0, 0, 0, config_data, 17,
2791 USB_CTRL_SET_TIMEOUT) != 0x11) {
2792 kfree(config_data);
2793 return -EIO;
2794 }
2795
2796 /* check if we have a valid interface */
2797 if (if_num > 16) {
2798 kfree(config_data);
2799 return -EINVAL;
2800 }
2801
2802 switch (config_data[if_num]) {
2803 case 0x0:
2804 result = 0;
2805 break;
2806 case 0x1:
2807 result = HSO_PORT_DIAG;
2808 break;
2809 case 0x2:
2810 result = HSO_PORT_GPS;
2811 break;
2812 case 0x3:
2813 result = HSO_PORT_GPS_CONTROL;
2814 break;
2815 case 0x4:
2816 result = HSO_PORT_APP;
2817 break;
2818 case 0x5:
2819 result = HSO_PORT_APP2;
2820 break;
2821 case 0x6:
2822 result = HSO_PORT_CONTROL;
2823 break;
2824 case 0x7:
2825 result = HSO_PORT_NETWORK;
2826 break;
2827 case 0x8:
2828 result = HSO_PORT_MODEM;
2829 break;
2830 case 0x9:
2831 result = HSO_PORT_MSD;
2832 break;
2833 case 0xa:
2834 result = HSO_PORT_PCSC;
2835 break;
2836 case 0xb:
2837 result = HSO_PORT_VOICE;
2838 break;
2839 default:
2840 result = 0;
2841 }
2842
2843 if (result)
2844 result |= HSO_INTF_BULK;
2845
2846 if (config_data[16] & 0x1)
2847 result |= HSO_INFO_CRC_BUG;
2848
2849 kfree(config_data);
2850 return result;
2851 }
2852
2853 /* called once for each interface upon device insertion */
2854 static int hso_probe(struct usb_interface *interface,
2855 const struct usb_device_id *id)
2856 {
2857 int mux, i, if_num, port_spec;
2858 unsigned char port_mask;
2859 struct hso_device *hso_dev = NULL;
2860 struct hso_shared_int *shared_int;
2861 struct hso_device *tmp_dev = NULL;
2862
2863 if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2864 dev_err(&interface->dev, "Not our interface\n");
2865 return -ENODEV;
2866 }
2867
2868 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2869
2870 /* Get the interface/port specification from either driver_info or from
2871 * the device itself */
2872 if (id->driver_info) {
2873 /* if_num is controlled by the device, driver_info is a 0 terminated
2874 * array. Make sure, the access is in bounds! */
2875 for (i = 0; i <= if_num; ++i)
2876 if (((u32 *)(id->driver_info))[i] == 0)
2877 goto exit;
2878 port_spec = ((u32 *)(id->driver_info))[if_num];
2879 } else {
2880 port_spec = hso_get_config_data(interface);
2881 if (port_spec < 0)
2882 goto exit;
2883 }
2884
2885 /* Check if we need to switch to alt interfaces prior to port
2886 * configuration */
2887 if (interface->num_altsetting > 1)
2888 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2889 interface->needs_remote_wakeup = 1;
2890
2891 /* Allocate new hso device(s) */
2892 switch (port_spec & HSO_INTF_MASK) {
2893 case HSO_INTF_MUX:
2894 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2895 /* Create the network device */
2896 if (!disable_net) {
2897 hso_dev = hso_create_net_device(interface,
2898 port_spec);
2899 if (!hso_dev)
2900 goto exit;
2901 tmp_dev = hso_dev;
2902 }
2903 }
2904
2905 if (hso_get_mux_ports(interface, &port_mask))
2906 /* TODO: de-allocate everything */
2907 goto exit;
2908
2909 shared_int = hso_create_shared_int(interface);
2910 if (!shared_int)
2911 goto exit;
2912
2913 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2914 if (port_mask & i) {
2915 hso_dev = hso_create_mux_serial_device(
2916 interface, i, shared_int);
2917 if (!hso_dev)
2918 goto exit;
2919 }
2920 }
2921
2922 if (tmp_dev)
2923 hso_dev = tmp_dev;
2924 break;
2925
2926 case HSO_INTF_BULK:
2927 /* It's a regular bulk interface */
2928 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2929 if (!disable_net)
2930 hso_dev =
2931 hso_create_net_device(interface, port_spec);
2932 } else {
2933 hso_dev =
2934 hso_create_bulk_serial_device(interface, port_spec);
2935 }
2936 if (!hso_dev)
2937 goto exit;
2938 break;
2939 default:
2940 goto exit;
2941 }
2942
2943 /* save our data pointer in this device */
2944 usb_set_intfdata(interface, hso_dev);
2945
2946 /* done */
2947 return 0;
2948 exit:
2949 hso_free_interface(interface);
2950 return -ENODEV;
2951 }
2952
2953 /* device removed, cleaning up */
2954 static void hso_disconnect(struct usb_interface *interface)
2955 {
2956 hso_free_interface(interface);
2957
2958 /* remove reference of our private data */
2959 usb_set_intfdata(interface, NULL);
2960 }
2961
2962 static void async_get_intf(struct work_struct *data)
2963 {
2964 struct hso_device *hso_dev =
2965 container_of(data, struct hso_device, async_get_intf);
2966 usb_autopm_get_interface(hso_dev->interface);
2967 }
2968
2969 static void async_put_intf(struct work_struct *data)
2970 {
2971 struct hso_device *hso_dev =
2972 container_of(data, struct hso_device, async_put_intf);
2973 usb_autopm_put_interface(hso_dev->interface);
2974 }
2975
2976 static int hso_get_activity(struct hso_device *hso_dev)
2977 {
2978 if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2979 if (!hso_dev->is_active) {
2980 hso_dev->is_active = 1;
2981 schedule_work(&hso_dev->async_get_intf);
2982 }
2983 }
2984
2985 if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2986 return -EAGAIN;
2987
2988 usb_mark_last_busy(hso_dev->usb);
2989
2990 return 0;
2991 }
2992
2993 static int hso_put_activity(struct hso_device *hso_dev)
2994 {
2995 if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
2996 if (hso_dev->is_active) {
2997 hso_dev->is_active = 0;
2998 schedule_work(&hso_dev->async_put_intf);
2999 return -EAGAIN;
3000 }
3001 }
3002 hso_dev->is_active = 0;
3003 return 0;
3004 }
3005
3006 /* called by kernel when we need to suspend device */
3007 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3008 {
3009 int i, result;
3010
3011 /* Stop all serial ports */
3012 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3013 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3014 result = hso_stop_serial_device(serial_table[i]);
3015 if (result)
3016 goto out;
3017 }
3018 }
3019
3020 /* Stop all network ports */
3021 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3022 if (network_table[i] &&
3023 (network_table[i]->interface == iface)) {
3024 result = hso_stop_net_device(network_table[i]);
3025 if (result)
3026 goto out;
3027 }
3028 }
3029
3030 out:
3031 return 0;
3032 }
3033
3034 /* called by kernel when we need to resume device */
3035 static int hso_resume(struct usb_interface *iface)
3036 {
3037 int i, result = 0;
3038 struct hso_net *hso_net;
3039
3040 /* Start all serial ports */
3041 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3042 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3043 if (dev2ser(serial_table[i])->port.count) {
3044 result =
3045 hso_start_serial_device(serial_table[i], GFP_NOIO);
3046 hso_kick_transmit(dev2ser(serial_table[i]));
3047 if (result)
3048 goto out;
3049 }
3050 }
3051 }
3052
3053 /* Start all network ports */
3054 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3055 if (network_table[i] &&
3056 (network_table[i]->interface == iface)) {
3057 hso_net = dev2net(network_table[i]);
3058 if (hso_net->flags & IFF_UP) {
3059 /* First transmit any lingering data,
3060 then restart the device. */
3061 if (hso_net->skb_tx_buf) {
3062 dev_dbg(&iface->dev,
3063 "Transmitting"
3064 " lingering data\n");
3065 hso_net_start_xmit(hso_net->skb_tx_buf,
3066 hso_net->net);
3067 hso_net->skb_tx_buf = NULL;
3068 }
3069 result = hso_start_net_device(network_table[i]);
3070 if (result)
3071 goto out;
3072 }
3073 }
3074 }
3075
3076 out:
3077 return result;
3078 }
3079
3080 static void hso_serial_ref_free(struct kref *ref)
3081 {
3082 struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3083
3084 hso_free_serial_device(hso_dev);
3085 }
3086
3087 static void hso_free_interface(struct usb_interface *interface)
3088 {
3089 struct hso_serial *serial;
3090 int i;
3091
3092 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3093 if (serial_table[i] &&
3094 (serial_table[i]->interface == interface)) {
3095 serial = dev2ser(serial_table[i]);
3096 tty_port_tty_hangup(&serial->port, false);
3097 mutex_lock(&serial->parent->mutex);
3098 serial->parent->usb_gone = 1;
3099 mutex_unlock(&serial->parent->mutex);
3100 cancel_work_sync(&serial_table[i]->async_put_intf);
3101 cancel_work_sync(&serial_table[i]->async_get_intf);
3102 hso_serial_tty_unregister(serial);
3103 kref_put(&serial_table[i]->ref, hso_serial_ref_free);
3104 set_serial_by_index(i, NULL);
3105 }
3106 }
3107
3108 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3109 if (network_table[i] &&
3110 (network_table[i]->interface == interface)) {
3111 struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3112 /* hso_stop_net_device doesn't stop the net queue since
3113 * traffic needs to start it again when suspended */
3114 netif_stop_queue(dev2net(network_table[i])->net);
3115 hso_stop_net_device(network_table[i]);
3116 cancel_work_sync(&network_table[i]->async_put_intf);
3117 cancel_work_sync(&network_table[i]->async_get_intf);
3118 if (rfk) {
3119 rfkill_unregister(rfk);
3120 rfkill_destroy(rfk);
3121 }
3122 hso_free_net_device(network_table[i]);
3123 }
3124 }
3125 }
3126
3127 /* Helper functions */
3128
3129 /* Get the endpoint ! */
3130 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3131 int type, int dir)
3132 {
3133 int i;
3134 struct usb_host_interface *iface = intf->cur_altsetting;
3135 struct usb_endpoint_descriptor *endp;
3136
3137 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3138 endp = &iface->endpoint[i].desc;
3139 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3140 (usb_endpoint_type(endp) == type))
3141 return endp;
3142 }
3143
3144 return NULL;
3145 }
3146
3147 /* Get the byte that describes which ports are enabled */
3148 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3149 {
3150 int i;
3151 struct usb_host_interface *iface = intf->cur_altsetting;
3152
3153 if (iface->extralen == 3) {
3154 *ports = iface->extra[2];
3155 return 0;
3156 }
3157
3158 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3159 if (iface->endpoint[i].extralen == 3) {
3160 *ports = iface->endpoint[i].extra[2];
3161 return 0;
3162 }
3163 }
3164
3165 return -1;
3166 }
3167
3168 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3169 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3170 struct usb_device *usb, gfp_t gfp)
3171 {
3172 int result;
3173
3174 usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3175 usb_rcvintpipe(usb,
3176 shared_int->intr_endp->bEndpointAddress & 0x7F),
3177 shared_int->shared_intr_buf,
3178 1,
3179 intr_callback, shared_int,
3180 shared_int->intr_endp->bInterval);
3181
3182 result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3183 if (result)
3184 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3185 result);
3186
3187 return result;
3188 }
3189
3190 /* operations setup of the serial interface */
3191 static const struct tty_operations hso_serial_ops = {
3192 .open = hso_serial_open,
3193 .close = hso_serial_close,
3194 .write = hso_serial_write,
3195 .write_room = hso_serial_write_room,
3196 .cleanup = hso_serial_cleanup,
3197 .ioctl = hso_serial_ioctl,
3198 .set_termios = hso_serial_set_termios,
3199 .chars_in_buffer = hso_serial_chars_in_buffer,
3200 .tiocmget = hso_serial_tiocmget,
3201 .tiocmset = hso_serial_tiocmset,
3202 .get_icount = hso_get_count,
3203 .unthrottle = hso_unthrottle
3204 };
3205
3206 static struct usb_driver hso_driver = {
3207 .name = driver_name,
3208 .probe = hso_probe,
3209 .disconnect = hso_disconnect,
3210 .id_table = hso_ids,
3211 .suspend = hso_suspend,
3212 .resume = hso_resume,
3213 .reset_resume = hso_resume,
3214 .supports_autosuspend = 1,
3215 .disable_hub_initiated_lpm = 1,
3216 };
3217
3218 static int __init hso_init(void)
3219 {
3220 int i;
3221 int result;
3222
3223 /* put it in the log */
3224 pr_info("%s\n", version);
3225
3226 /* Initialise the serial table semaphore and table */
3227 spin_lock_init(&serial_table_lock);
3228 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3229 serial_table[i] = NULL;
3230
3231 /* allocate our driver using the proper amount of supported minors */
3232 tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3233 if (!tty_drv)
3234 return -ENOMEM;
3235
3236 /* fill in all needed values */
3237 tty_drv->driver_name = driver_name;
3238 tty_drv->name = tty_filename;
3239
3240 /* if major number is provided as parameter, use that one */
3241 if (tty_major)
3242 tty_drv->major = tty_major;
3243
3244 tty_drv->minor_start = 0;
3245 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3246 tty_drv->subtype = SERIAL_TYPE_NORMAL;
3247 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3248 tty_drv->init_termios = tty_std_termios;
3249 hso_init_termios(&tty_drv->init_termios);
3250 tty_set_operations(tty_drv, &hso_serial_ops);
3251
3252 /* register the tty driver */
3253 result = tty_register_driver(tty_drv);
3254 if (result) {
3255 pr_err("%s - tty_register_driver failed(%d)\n",
3256 __func__, result);
3257 goto err_free_tty;
3258 }
3259
3260 /* register this module as an usb driver */
3261 result = usb_register(&hso_driver);
3262 if (result) {
3263 pr_err("Could not register hso driver - error: %d\n", result);
3264 goto err_unreg_tty;
3265 }
3266
3267 /* done */
3268 return 0;
3269 err_unreg_tty:
3270 tty_unregister_driver(tty_drv);
3271 err_free_tty:
3272 put_tty_driver(tty_drv);
3273 return result;
3274 }
3275
3276 static void __exit hso_exit(void)
3277 {
3278 pr_info("unloaded\n");
3279
3280 tty_unregister_driver(tty_drv);
3281 /* deregister the usb driver */
3282 usb_deregister(&hso_driver);
3283 put_tty_driver(tty_drv);
3284 }
3285
3286 /* Module definitions */
3287 module_init(hso_init);
3288 module_exit(hso_exit);
3289
3290 MODULE_AUTHOR(MOD_AUTHOR);
3291 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3292 MODULE_LICENSE("GPL");
3293
3294 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3295 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3296 module_param(debug, int, 0644);
3297
3298 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3299 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3300 module_param(tty_major, int, 0644);
3301
3302 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3303 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3304 module_param(disable_net, int, 0644);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git