]> err.no Git - linux-2.6/blob - drivers/usb/serial/airprime.c
Merge branch 'for-2.6.26' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer...
[linux-2.6] / drivers / usb / serial / airprime.c
1 /*
2  * AirPrime CDMA Wireless Serial USB driver
3  *
4  * Copyright (C) 2005-2006 Greg Kroah-Hartman <gregkh@suse.de>
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License version
8  *      2 as published by the Free Software Foundation.
9  */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/tty.h>
14 #include <linux/tty_flip.h>
15 #include <linux/module.h>
16 #include <linux/usb.h>
17 #include <linux/usb/serial.h>
18
19 static struct usb_device_id id_table [] = {
20         { USB_DEVICE(0x0c88, 0x17da) }, /* Kyocera Wireless KPC650/Passport */
21         { },
22 };
23 MODULE_DEVICE_TABLE(usb, id_table);
24
25 #define URB_TRANSFER_BUFFER_SIZE        4096
26 #define NUM_READ_URBS                   4
27 #define NUM_WRITE_URBS                  4
28 #define NUM_BULK_EPS                    3
29 #define MAX_BULK_EPS                    6
30
31 /* if overridden by the user, then use their value for the size of the
32  * read and write urbs, and the number of endpoints */
33 static int buffer_size = URB_TRANSFER_BUFFER_SIZE;
34 static int endpoints = NUM_BULK_EPS;
35 static int debug;
36 struct airprime_private {
37         spinlock_t lock;
38         int outstanding_urbs;
39         int throttled;
40         struct urb *read_urbp[NUM_READ_URBS];
41
42         /* Settings for the port */
43         int rts_state;  /* Handshaking pins (outputs) */
44         int dtr_state;
45         int cts_state;  /* Handshaking pins (inputs) */
46         int dsr_state;
47         int dcd_state;
48         int ri_state;
49 };
50
51 static int airprime_send_setup(struct usb_serial_port *port)
52 {
53         struct usb_serial *serial = port->serial;
54         struct airprime_private *priv;
55
56         dbg("%s", __func__);
57
58         if (port->number != 0)
59                 return 0;
60
61         priv = usb_get_serial_port_data(port);
62
63         if (port->tty) {
64                 int val = 0;
65                 if (priv->dtr_state)
66                         val |= 0x01;
67                 if (priv->rts_state)
68                         val |= 0x02;
69
70                 return usb_control_msg(serial->dev,
71                                         usb_rcvctrlpipe(serial->dev, 0),
72                                         0x22, 0x21, val, 0, NULL, 0,
73                                         USB_CTRL_SET_TIMEOUT);
74         }
75
76         return 0;
77 }
78
79 static void airprime_read_bulk_callback(struct urb *urb)
80 {
81         struct usb_serial_port *port = urb->context;
82         unsigned char *data = urb->transfer_buffer;
83         struct tty_struct *tty;
84         int result;
85         int status = urb->status;
86
87         dbg("%s - port %d", __func__, port->number);
88
89         if (status) {
90                 dbg("%s - nonzero read bulk status received: %d",
91                     __func__, status);
92                 return;
93         }
94         usb_serial_debug_data(debug, &port->dev, __func__,
95                                                 urb->actual_length, data);
96
97         tty = port->tty;
98         if (tty && urb->actual_length) {
99                 tty_insert_flip_string(tty, data, urb->actual_length);
100                 tty_flip_buffer_push(tty);
101         }
102
103         result = usb_submit_urb(urb, GFP_ATOMIC);
104         if (result)
105                 dev_err(&port->dev,
106                         "%s - failed resubmitting read urb, error %d\n",
107                         __func__, result);
108         return;
109 }
110
111 static void airprime_write_bulk_callback(struct urb *urb)
112 {
113         struct usb_serial_port *port = urb->context;
114         struct airprime_private *priv = usb_get_serial_port_data(port);
115         int status = urb->status;
116         unsigned long flags;
117
118         dbg("%s - port %d", __func__, port->number);
119
120         /* free up the transfer buffer, as usb_free_urb() does not do this */
121         kfree(urb->transfer_buffer);
122
123         if (status)
124                 dbg("%s - nonzero write bulk status received: %d",
125                     __func__, status);
126         spin_lock_irqsave(&priv->lock, flags);
127         --priv->outstanding_urbs;
128         spin_unlock_irqrestore(&priv->lock, flags);
129
130         usb_serial_port_softint(port);
131 }
132
133 static int airprime_open(struct usb_serial_port *port, struct file *filp)
134 {
135         struct airprime_private *priv = usb_get_serial_port_data(port);
136         struct usb_serial *serial = port->serial;
137         struct urb *urb;
138         char *buffer = NULL;
139         int i;
140         int result = 0;
141
142         dbg("%s - port %d", __func__, port->number);
143
144         /* initialize our private data structure if it isn't already created */
145         if (!priv) {
146                 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
147                 if (!priv) {
148                         result = -ENOMEM;
149                         goto out;
150                 }
151                 spin_lock_init(&priv->lock);
152                 usb_set_serial_port_data(port, priv);
153         }
154
155         /* Set some sane defaults */
156         priv->rts_state = 1;
157         priv->dtr_state = 1;
158
159         for (i = 0; i < NUM_READ_URBS; ++i) {
160                 buffer = kmalloc(buffer_size, GFP_KERNEL);
161                 if (!buffer) {
162                         dev_err(&port->dev, "%s - out of memory.\n",
163                                 __func__);
164                         result = -ENOMEM;
165                         goto errout;
166                 }
167                 urb = usb_alloc_urb(0, GFP_KERNEL);
168                 if (!urb) {
169                         kfree(buffer);
170                         dev_err(&port->dev, "%s - no more urbs?\n",
171                                 __func__);
172                         result = -ENOMEM;
173                         goto errout;
174                 }
175                 usb_fill_bulk_urb(urb, serial->dev,
176                                   usb_rcvbulkpipe(serial->dev,
177                                           port->bulk_out_endpointAddress),
178                                   buffer, buffer_size,
179                                   airprime_read_bulk_callback, port);
180                 result = usb_submit_urb(urb, GFP_KERNEL);
181                 if (result) {
182                         usb_free_urb(urb);
183                         kfree(buffer);
184                         dev_err(&port->dev,
185                                 "%s - failed submitting read urb %d for port %d, error %d\n",
186                                 __func__, i, port->number, result);
187                         goto errout;
188                 }
189                 /* remember this urb so we can kill it when the
190                    port is closed */
191                 priv->read_urbp[i] = urb;
192         }
193
194         airprime_send_setup(port);
195
196         goto out;
197
198  errout:
199         /* some error happened, cancel any submitted urbs and clean up
200            anything that got allocated successfully */
201
202         while (i-- != 0) {
203                 urb = priv->read_urbp[i];
204                 buffer = urb->transfer_buffer;
205                 usb_kill_urb(urb);
206                 usb_free_urb(urb);
207                 kfree(buffer);
208         }
209
210  out:
211         return result;
212 }
213
214 static void airprime_close(struct usb_serial_port *port, struct file *filp)
215 {
216         struct airprime_private *priv = usb_get_serial_port_data(port);
217         int i;
218
219         dbg("%s - port %d", __func__, port->number);
220
221         priv->rts_state = 0;
222         priv->dtr_state = 0;
223
224         mutex_lock(&port->serial->disc_mutex);
225         if (!port->serial->disconnected)
226                 airprime_send_setup(port);
227         mutex_unlock(&port->serial->disc_mutex);
228
229         for (i = 0; i < NUM_READ_URBS; ++i) {
230                 usb_kill_urb(priv->read_urbp[i]);
231                 kfree(priv->read_urbp[i]->transfer_buffer);
232                 usb_free_urb(priv->read_urbp[i]);
233         }
234
235         /* free up private structure */
236         kfree(priv);
237         usb_set_serial_port_data(port, NULL);
238 }
239
240 static int airprime_write(struct usb_serial_port *port,
241                           const unsigned char *buf, int count)
242 {
243         struct airprime_private *priv = usb_get_serial_port_data(port);
244         struct usb_serial *serial = port->serial;
245         struct urb *urb;
246         unsigned char *buffer;
247         unsigned long flags;
248         int status;
249         dbg("%s - port %d", __func__, port->number);
250
251         spin_lock_irqsave(&priv->lock, flags);
252         if (priv->outstanding_urbs > NUM_WRITE_URBS) {
253                 spin_unlock_irqrestore(&priv->lock, flags);
254                 dbg("%s - write limit hit\n", __func__);
255                 return 0;
256         }
257         spin_unlock_irqrestore(&priv->lock, flags);
258         buffer = kmalloc(count, GFP_ATOMIC);
259         if (!buffer) {
260                 dev_err(&port->dev, "out of memory\n");
261                 return -ENOMEM;
262         }
263         urb = usb_alloc_urb(0, GFP_ATOMIC);
264         if (!urb) {
265                 dev_err(&port->dev, "no more free urbs\n");
266                 kfree(buffer);
267                 return -ENOMEM;
268         }
269         memcpy(buffer, buf, count);
270
271         usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
272
273         usb_fill_bulk_urb(urb, serial->dev,
274                           usb_sndbulkpipe(serial->dev,
275                                           port->bulk_out_endpointAddress),
276                           buffer, count,
277                           airprime_write_bulk_callback, port);
278
279         /* send it down the pipe */
280         status = usb_submit_urb(urb, GFP_ATOMIC);
281         if (status) {
282                 dev_err(&port->dev,
283                         "%s - usb_submit_urb(write bulk) failed with status = %d\n",
284                         __func__, status);
285                 count = status;
286                 kfree(buffer);
287         } else {
288                 spin_lock_irqsave(&priv->lock, flags);
289                 ++priv->outstanding_urbs;
290                 spin_unlock_irqrestore(&priv->lock, flags);
291         }
292         /* we are done with this urb, so let the host driver
293          * really free it when it is finished with it */
294         usb_free_urb(urb);
295         return count;
296 }
297
298 static struct usb_driver airprime_driver = {
299         .name =         "airprime",
300         .probe =        usb_serial_probe,
301         .disconnect =   usb_serial_disconnect,
302         .id_table =     id_table,
303         .no_dynamic_id =        1,
304 };
305
306 static struct usb_serial_driver airprime_device = {
307         .driver = {
308                 .owner =        THIS_MODULE,
309                 .name =         "airprime",
310         },
311         .usb_driver =           &airprime_driver,
312         .id_table =             id_table,
313         .open =                 airprime_open,
314         .close =                airprime_close,
315         .write =                airprime_write,
316 };
317
318 static int __init airprime_init(void)
319 {
320         int retval;
321
322         airprime_device.num_ports = endpoints;
323         if (endpoints < 0 || endpoints >= MAX_BULK_EPS)
324                 airprime_device.num_ports = NUM_BULK_EPS;
325
326         retval = usb_serial_register(&airprime_device);
327         if (retval)
328                 return retval;
329         retval = usb_register(&airprime_driver);
330         if (retval)
331                 usb_serial_deregister(&airprime_device);
332         return retval;
333 }
334
335 static void __exit airprime_exit(void)
336 {
337         dbg("%s", __func__);
338
339         usb_deregister(&airprime_driver);
340         usb_serial_deregister(&airprime_device);
341 }
342
343 module_init(airprime_init);
344 module_exit(airprime_exit);
345 MODULE_LICENSE("GPL");
346
347 module_param(debug, bool, S_IRUGO | S_IWUSR);
348 MODULE_PARM_DESC(debug, "Debug enabled");
349 module_param(buffer_size, int, 0);
350 MODULE_PARM_DESC(buffer_size,
351                 "Size of the transfer buffers in bytes (default 4096)");
352 module_param(endpoints, int, 0);
353 MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)");