[PATCH] USB: remove .owner field from struct usb_driver
[linux-2.6.git] / 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         .name =         "omninet",
84         .probe =        usb_serial_probe,
85         .disconnect =   usb_serial_disconnect,
86         .id_table =     id_table,
87         .no_dynamic_id =        1,
88 };
89
90
91 static struct usb_serial_driver zyxel_omninet_device = {
92         .driver = {
93                 .owner =        THIS_MODULE,
94                 .name =         "omninet",
95         },
96         .description =          "ZyXEL - omni.net lcd plus usb",
97         .id_table =             id_table,
98         .num_interrupt_in =     1,
99         .num_bulk_in =          1,
100         .num_bulk_out =         2,
101         .num_ports =            1,
102         .open =                 omninet_open,
103         .close =                omninet_close,
104         .write =                omninet_write,
105         .write_room =           omninet_write_room,
106         .read_bulk_callback =   omninet_read_bulk_callback,
107         .write_bulk_callback =  omninet_write_bulk_callback,
108         .shutdown =             omninet_shutdown,
109 };
110
111
112 /* The protocol.
113  *
114  * The omni.net always exchange 64 bytes of data with the host. The first
115  * four bytes are the control header, you can see it in the above structure.
116  *
117  * oh_seq is a sequence number. Don't know if/how it's used.
118  * oh_len is the length of the data bytes in the packet.
119  * oh_xxx Bit-mapped, related to handshaking and status info.
120  *      I normally set it to 0x03 in trasmitted frames.
121  *      7: Active when the TA is in a CONNECTed state.
122  *      6: unknown
123  *      5: handshaking, unknown
124  *      4: handshaking, unknown
125  *      3: unknown, usually 0
126  *      2: unknown, usually 0
127  *      1: handshaking, unknown, usually set to 1 in trasmitted frames
128  *      0: handshaking, unknown, usually set to 1 in trasmitted frames
129  * oh_pad Probably a pad byte.
130  *
131  * After the header you will find data bytes if oh_len was greater than zero.
132  *
133  */
134
135 struct omninet_header
136 {
137         __u8    oh_seq;
138         __u8    oh_len;
139         __u8    oh_xxx;
140         __u8    oh_pad;
141 };
142
143 struct omninet_data
144 {
145         __u8    od_outseq;      // Sequence number for bulk_out URBs
146 };
147
148 static int omninet_open (struct usb_serial_port *port, struct file *filp)
149 {
150         struct usb_serial       *serial = port->serial;
151         struct usb_serial_port  *wport;
152         struct omninet_data     *od;
153         int                     result = 0;
154
155         dbg("%s - port %d", __FUNCTION__, port->number);
156
157         od = kmalloc( sizeof(struct omninet_data), GFP_KERNEL );
158         if( !od ) {
159                 err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct omninet_data));
160                 return -ENOMEM;
161         }
162
163         usb_set_serial_port_data(port, od);
164         wport = serial->port[1];
165         wport->tty = port->tty;
166
167         /* Start reading from the device */
168         usb_fill_bulk_urb(port->read_urb, serial->dev, 
169                       usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
170                       port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
171                       omninet_read_bulk_callback, port);
172         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
173         if (result)
174                 err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
175
176         return result;
177 }
178
179 static void omninet_close (struct usb_serial_port *port, struct file * filp)
180 {
181         struct usb_serial       *serial = port->serial;
182         struct usb_serial_port  *wport;
183
184         dbg("%s - port %d", __FUNCTION__, port->number);
185
186         wport = serial->port[1];
187         usb_kill_urb(wport->write_urb);
188         usb_kill_urb(port->read_urb);
189
190         kfree(usb_get_serial_port_data(port));
191 }
192
193
194 #define OMNINET_DATAOFFSET      0x04
195 #define OMNINET_HEADERLEN       sizeof(struct omninet_header)
196 #define OMNINET_BULKOUTSIZE     (64 - OMNINET_HEADERLEN)
197
198 static void omninet_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
199 {
200         struct usb_serial_port  *port   = (struct usb_serial_port *)urb->context;
201         unsigned char           *data   = urb->transfer_buffer;
202         struct omninet_header   *header = (struct omninet_header *) &data[0];
203
204         int i;
205         int result;
206
207 //      dbg("omninet_read_bulk_callback");
208
209         if (urb->status) {
210                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
211                 return;
212         }
213
214         if ((debug) && (header->oh_xxx != 0x30)) {
215                 if (urb->actual_length) {
216                         printk (KERN_DEBUG __FILE__ ": omninet_read %d: ", header->oh_len);
217                         for (i = 0; i < (header->oh_len + OMNINET_HEADERLEN); i++) {
218                                 printk ("%.2x ", data[i]);
219                         }
220                         printk ("\n");
221                 }
222         }
223
224         if (urb->actual_length && header->oh_len) {
225                 for (i = 0; i < header->oh_len; i++) {
226                          tty_insert_flip_char(port->tty, data[OMNINET_DATAOFFSET + i], 0);
227                 }
228                 tty_flip_buffer_push(port->tty);
229         }
230
231         /* Continue trying to always read  */
232         usb_fill_bulk_urb(urb, port->serial->dev, 
233                       usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
234                       urb->transfer_buffer, urb->transfer_buffer_length,
235                       omninet_read_bulk_callback, port);
236         result = usb_submit_urb(urb, GFP_ATOMIC);
237         if (result)
238                 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
239
240         return;
241 }
242
243 static int omninet_write (struct usb_serial_port *port, const unsigned char *buf, int count)
244 {
245         struct usb_serial       *serial = port->serial;
246         struct usb_serial_port  *wport  = serial->port[1];
247
248         struct omninet_data     *od     = usb_get_serial_port_data(port);
249         struct omninet_header   *header = (struct omninet_header *) wport->write_urb->transfer_buffer;
250
251         int                     result;
252
253 //      dbg("omninet_write port %d", port->number);
254
255         if (count == 0) {
256                 dbg("%s - write request of 0 bytes", __FUNCTION__);
257                 return (0);
258         }
259
260         spin_lock(&port->lock);
261         if (port->write_urb_busy) {
262                 spin_unlock(&port->lock);
263                 dbg("%s - already writing", __FUNCTION__);
264                 return 0;
265         }
266         port->write_urb_busy = 1;
267         spin_unlock(&port->lock);
268
269         count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
270
271         memcpy (wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count);
272
273         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, wport->write_urb->transfer_buffer);
274
275         header->oh_seq  = od->od_outseq++;
276         header->oh_len  = count;
277         header->oh_xxx  = 0x03;
278         header->oh_pad  = 0x00;
279
280         /* send the data out the bulk port, always 64 bytes */
281         wport->write_urb->transfer_buffer_length = 64;
282
283         wport->write_urb->dev = serial->dev;
284         result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
285         if (result) {
286                 port->write_urb_busy = 0;
287                 err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
288         } else
289                 result = count;
290
291         return result;
292 }
293
294
295 static int omninet_write_room (struct usb_serial_port *port)
296 {
297         struct usb_serial       *serial = port->serial;
298         struct usb_serial_port  *wport  = serial->port[1];
299
300         int room = 0; // Default: no room
301
302         if (wport->write_urb_busy)
303                 room = wport->bulk_out_size - OMNINET_HEADERLEN;
304
305 //      dbg("omninet_write_room returns %d", room);
306
307         return (room);
308 }
309
310 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
311 {
312 /*      struct omninet_header   *header = (struct omninet_header  *) urb->transfer_buffer; */
313         struct usb_serial_port  *port   = (struct usb_serial_port *) urb->context;
314
315 //      dbg("omninet_write_bulk_callback, port %0x\n", port);
316
317         port->write_urb_busy = 0;
318         if (urb->status) {
319                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
320                 return;
321         }
322
323         schedule_work(&port->work);
324
325 //      dbg("omninet_write_bulk_callback, tty %0x\n", tty);
326 }
327
328
329 static void omninet_shutdown (struct usb_serial *serial)
330 {
331         dbg ("%s", __FUNCTION__);
332 }
333
334
335 static int __init omninet_init (void)
336 {
337         int retval;
338         retval = usb_serial_register(&zyxel_omninet_device);
339         if (retval)
340                 goto failed_usb_serial_register;
341         retval = usb_register(&omninet_driver);
342         if (retval)
343                 goto failed_usb_register;
344         info(DRIVER_VERSION ":" DRIVER_DESC);
345         return 0;
346 failed_usb_register:
347         usb_serial_deregister(&zyxel_omninet_device);
348 failed_usb_serial_register:
349         return retval;
350 }
351
352
353 static void __exit omninet_exit (void)
354 {
355         usb_deregister (&omninet_driver);
356         usb_serial_deregister (&zyxel_omninet_device);
357 }
358
359
360 module_init(omninet_init);
361 module_exit(omninet_exit);
362
363 MODULE_AUTHOR( DRIVER_AUTHOR );
364 MODULE_DESCRIPTION( DRIVER_DESC );
365 MODULE_LICENSE("GPL");
366
367 module_param(debug, bool, S_IRUGO | S_IWUSR);
368 MODULE_PARM_DESC(debug, "Debug enabled or not");