Pull remove-sn-bist-lock into release branch
[linux-2.6] / drivers / usb / serial / omninet.c
1 /*
2  * USB ZyXEL omni.net LCD PLUS driver
3  *
4  *      This program is free software; you can redistribute it and/or modify
5  *      it under the terms of the GNU General Public License as published by
6  *      the Free Software Foundation; either version 2 of the License, or
7  *      (at your option) any later version.
8  *
9  * See Documentation/usb/usb-serial.txt for more information on using this driver
10  *
11  * Please report both successes and troubles to the author at omninet@kroah.com
12  * 
13  * (05/30/2001) gkh
14  *      switched from using spinlock to a semaphore, which fixes lots of problems.
15  *
16  * (04/08/2001) gb
17  *      Identify version on module load.
18  *
19  * (11/01/2000) Adam J. Richter
20  *      usb_device_id table support
21  * 
22  * (10/05/2000) gkh
23  *      Fixed bug with urb->dev not being set properly, now that the usb
24  *      core needs it.
25  * 
26  * (08/28/2000) gkh
27  *      Added locks for SMP safeness.
28  *      Fixed MOD_INC and MOD_DEC logic and the ability to open a port more 
29  *      than once.
30  *      Fixed potential race in omninet_write_bulk_callback
31  *
32  * (07/19/2000) gkh
33  *      Added module_init and module_exit functions to handle the fact that this
34  *      driver is a loadable module now.
35  *
36  */
37
38 #include <linux/config.h>
39 #include <linux/kernel.h>
40 #include <linux/errno.h>
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/tty.h>
44 #include <linux/tty_driver.h>
45 #include <linux/tty_flip.h>
46 #include <linux/module.h>
47 #include <linux/spinlock.h>
48 #include <asm/uaccess.h>
49 #include <linux/usb.h>
50 #include "usb-serial.h"
51
52 static int debug;
53
54 /*
55  * Version Information
56  */
57 #define DRIVER_VERSION "v1.1"
58 #define DRIVER_AUTHOR "Alessandro Zummo"
59 #define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
60
61 #define ZYXEL_VENDOR_ID         0x0586
62 #define ZYXEL_OMNINET_ID        0x1000
63 #define BT_IGNITIONPRO_ID       0x2000  /* This one seems to be a re-branded ZyXEL device */
64
65 /* function prototypes */
66 static int  omninet_open                (struct usb_serial_port *port, struct file *filp);
67 static void omninet_close               (struct usb_serial_port *port, struct file *filp);
68 static void omninet_read_bulk_callback  (struct urb *urb, struct pt_regs *regs);
69 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
70 static int  omninet_write               (struct usb_serial_port *port, const unsigned char *buf, int count);
71 static int  omninet_write_room          (struct usb_serial_port *port);
72 static void omninet_shutdown            (struct usb_serial *serial);
73
74 static struct usb_device_id id_table [] = {
75         { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
76         { USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
77         { }                                             /* Terminating entry */
78 };
79
80 MODULE_DEVICE_TABLE (usb, id_table);
81
82 static struct usb_driver omninet_driver = {
83         .owner =        THIS_MODULE,
84         .name =         "omninet",
85         .probe =        usb_serial_probe,
86         .disconnect =   usb_serial_disconnect,
87         .id_table =     id_table,
88 };
89
90
91 static struct usb_serial_device_type zyxel_omninet_device = {
92         .owner =                THIS_MODULE,
93         .name =                 "ZyXEL - omni.net lcd plus usb",
94         .short_name =           "omninet",
95         .id_table =             id_table,
96         .num_interrupt_in =     1,
97         .num_bulk_in =          1,
98         .num_bulk_out =         2,
99         .num_ports =            1,
100         .open =                 omninet_open,
101         .close =                omninet_close,
102         .write =                omninet_write,
103         .write_room =           omninet_write_room,
104         .read_bulk_callback =   omninet_read_bulk_callback,
105         .write_bulk_callback =  omninet_write_bulk_callback,
106         .shutdown =             omninet_shutdown,
107 };
108
109
110 /* The protocol.
111  *
112  * The omni.net always exchange 64 bytes of data with the host. The first
113  * four bytes are the control header, you can see it in the above structure.
114  *
115  * oh_seq is a sequence number. Don't know if/how it's used.
116  * oh_len is the length of the data bytes in the packet.
117  * oh_xxx Bit-mapped, related to handshaking and status info.
118  *      I normally set it to 0x03 in trasmitted frames.
119  *      7: Active when the TA is in a CONNECTed state.
120  *      6: unknown
121  *      5: handshaking, unknown
122  *      4: handshaking, unknown
123  *      3: unknown, usually 0
124  *      2: unknown, usually 0
125  *      1: handshaking, unknown, usually set to 1 in trasmitted frames
126  *      0: handshaking, unknown, usually set to 1 in trasmitted frames
127  * oh_pad Probably a pad byte.
128  *
129  * After the header you will find data bytes if oh_len was greater than zero.
130  *
131  */
132
133 struct omninet_header
134 {
135         __u8    oh_seq;
136         __u8    oh_len;
137         __u8    oh_xxx;
138         __u8    oh_pad;
139 };
140
141 struct omninet_data
142 {
143         __u8    od_outseq;      // Sequence number for bulk_out URBs
144 };
145
146 static int omninet_open (struct usb_serial_port *port, struct file *filp)
147 {
148         struct usb_serial       *serial = port->serial;
149         struct usb_serial_port  *wport;
150         struct omninet_data     *od;
151         int                     result = 0;
152
153         dbg("%s - port %d", __FUNCTION__, port->number);
154
155         od = kmalloc( sizeof(struct omninet_data), GFP_KERNEL );
156         if( !od ) {
157                 err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct omninet_data));
158                 return -ENOMEM;
159         }
160
161         usb_set_serial_port_data(port, od);
162         wport = serial->port[1];
163         wport->tty = port->tty;
164
165         /* Start reading from the device */
166         usb_fill_bulk_urb(port->read_urb, serial->dev, 
167                       usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
168                       port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
169                       omninet_read_bulk_callback, port);
170         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
171         if (result)
172                 err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
173
174         return result;
175 }
176
177 static void omninet_close (struct usb_serial_port *port, struct file * filp)
178 {
179         struct usb_serial       *serial = port->serial;
180         struct usb_serial_port  *wport;
181
182         dbg("%s - port %d", __FUNCTION__, port->number);
183
184         wport = serial->port[1];
185         usb_kill_urb(wport->write_urb);
186         usb_kill_urb(port->read_urb);
187
188         kfree(usb_get_serial_port_data(port));
189 }
190
191
192 #define OMNINET_DATAOFFSET      0x04
193 #define OMNINET_HEADERLEN       sizeof(struct omninet_header)
194 #define OMNINET_BULKOUTSIZE     (64 - OMNINET_HEADERLEN)
195
196 static void omninet_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
197 {
198         struct usb_serial_port  *port   = (struct usb_serial_port *)urb->context;
199         unsigned char           *data   = urb->transfer_buffer;
200         struct omninet_header   *header = (struct omninet_header *) &data[0];
201
202         int i;
203         int result;
204
205 //      dbg("omninet_read_bulk_callback");
206
207         if (urb->status) {
208                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
209                 return;
210         }
211
212         if ((debug) && (header->oh_xxx != 0x30)) {
213                 if (urb->actual_length) {
214                         printk (KERN_DEBUG __FILE__ ": omninet_read %d: ", header->oh_len);
215                         for (i = 0; i < (header->oh_len + OMNINET_HEADERLEN); i++) {
216                                 printk ("%.2x ", data[i]);
217                         }
218                         printk ("\n");
219                 }
220         }
221
222         if (urb->actual_length && header->oh_len) {
223                 for (i = 0; i < header->oh_len; i++) {
224                          tty_insert_flip_char(port->tty, data[OMNINET_DATAOFFSET + i], 0);
225                 }
226                 tty_flip_buffer_push(port->tty);
227         }
228
229         /* Continue trying to always read  */
230         usb_fill_bulk_urb(urb, port->serial->dev, 
231                       usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
232                       urb->transfer_buffer, urb->transfer_buffer_length,
233                       omninet_read_bulk_callback, port);
234         result = usb_submit_urb(urb, GFP_ATOMIC);
235         if (result)
236                 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
237
238         return;
239 }
240
241 static int omninet_write (struct usb_serial_port *port, const unsigned char *buf, int count)
242 {
243         struct usb_serial       *serial = port->serial;
244         struct usb_serial_port  *wport  = serial->port[1];
245
246         struct omninet_data     *od     = usb_get_serial_port_data(port);
247         struct omninet_header   *header = (struct omninet_header *) wport->write_urb->transfer_buffer;
248
249         int                     result;
250
251 //      dbg("omninet_write port %d", port->number);
252
253         if (count == 0) {
254                 dbg("%s - write request of 0 bytes", __FUNCTION__);
255                 return (0);
256         }
257
258         spin_lock(&port->lock);
259         if (port->write_urb_busy) {
260                 spin_unlock(&port->lock);
261                 dbg("%s - already writing", __FUNCTION__);
262                 return 0;
263         }
264         port->write_urb_busy = 1;
265         spin_unlock(&port->lock);
266
267         count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
268
269         memcpy (wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count);
270
271         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, wport->write_urb->transfer_buffer);
272
273         header->oh_seq  = od->od_outseq++;
274         header->oh_len  = count;
275         header->oh_xxx  = 0x03;
276         header->oh_pad  = 0x00;
277
278         /* send the data out the bulk port, always 64 bytes */
279         wport->write_urb->transfer_buffer_length = 64;
280
281         wport->write_urb->dev = serial->dev;
282         result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
283         if (result) {
284                 port->write_urb_busy = 0;
285                 err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
286         } else
287                 result = count;
288
289         return result;
290 }
291
292
293 static int omninet_write_room (struct usb_serial_port *port)
294 {
295         struct usb_serial       *serial = port->serial;
296         struct usb_serial_port  *wport  = serial->port[1];
297
298         int room = 0; // Default: no room
299
300         if (wport->write_urb_busy)
301                 room = wport->bulk_out_size - OMNINET_HEADERLEN;
302
303 //      dbg("omninet_write_room returns %d", room);
304
305         return (room);
306 }
307
308 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
309 {
310 /*      struct omninet_header   *header = (struct omninet_header  *) urb->transfer_buffer; */
311         struct usb_serial_port  *port   = (struct usb_serial_port *) urb->context;
312
313 //      dbg("omninet_write_bulk_callback, port %0x\n", port);
314
315         port->write_urb_busy = 0;
316         if (urb->status) {
317                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
318                 return;
319         }
320
321         schedule_work(&port->work);
322
323 //      dbg("omninet_write_bulk_callback, tty %0x\n", tty);
324 }
325
326
327 static void omninet_shutdown (struct usb_serial *serial)
328 {
329         dbg ("%s", __FUNCTION__);
330 }
331
332
333 static int __init omninet_init (void)
334 {
335         int retval;
336         retval = usb_serial_register(&zyxel_omninet_device);
337         if (retval)
338                 goto failed_usb_serial_register;
339         retval = usb_register(&omninet_driver);
340         if (retval)
341                 goto failed_usb_register;
342         info(DRIVER_VERSION ":" DRIVER_DESC);
343         return 0;
344 failed_usb_register:
345         usb_serial_deregister(&zyxel_omninet_device);
346 failed_usb_serial_register:
347         return retval;
348 }
349
350
351 static void __exit omninet_exit (void)
352 {
353         usb_deregister (&omninet_driver);
354         usb_serial_deregister (&zyxel_omninet_device);
355 }
356
357
358 module_init(omninet_init);
359 module_exit(omninet_exit);
360
361 MODULE_AUTHOR( DRIVER_AUTHOR );
362 MODULE_DESCRIPTION( DRIVER_DESC );
363 MODULE_LICENSE("GPL");
364
365 module_param(debug, bool, S_IRUGO | S_IWUSR);
366 MODULE_PARM_DESC(debug, "Debug enabled or not");