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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 { USB_DEVICE(0x1410, 0x1110) }, /* Novatel Wireless Merlin CDMA */
22 { USB_DEVICE(0x1410, 0x1130) }, /* Novatel Wireless S720 CDMA/EV-DO */
23 { USB_DEVICE(0x1410, 0x2110) }, /* Novatel Wireless U720 CDMA/EV-DO */
24 { USB_DEVICE(0x1410, 0x1430) }, /* Novatel Merlin XU870 HSDPA/3G */
25 { USB_DEVICE(0x1410, 0x1100) }, /* ExpressCard34 Qualcomm 3G CDMA */
26 { USB_DEVICE(0x413c, 0x8115) }, /* Dell Wireless HSDPA 5500 */
27 { },
28 };
29 MODULE_DEVICE_TABLE(usb, id_table);
30
31 #define URB_TRANSFER_BUFFER_SIZE 4096
32 #define NUM_READ_URBS 4
33 #define NUM_WRITE_URBS 4
34 #define NUM_BULK_EPS 3
35 #define MAX_BULK_EPS 6
36
37 /* if overridden by the user, then use their value for the size of the
38 * read and write urbs, and the number of endpoints */
39 static int buffer_size = URB_TRANSFER_BUFFER_SIZE;
40 static int endpoints = NUM_BULK_EPS;
41 static int debug;
42 struct airprime_private {
43 spinlock_t lock;
44 int outstanding_urbs;
45 int throttled;
46 struct urb *read_urbp[NUM_READ_URBS];
47 };
48
49 static void airprime_read_bulk_callback(struct urb *urb)
50 {
51 struct usb_serial_port *port = urb->context;
52 unsigned char *data = urb->transfer_buffer;
53 struct tty_struct *tty;
54 int result;
55
56 dbg("%s - port %d", __FUNCTION__, port->number);
57
58 if (urb->status) {
59 dbg("%s - nonzero read bulk status received: %d",
60 __FUNCTION__, urb->status);
61 /* something happened, so free up the memory for this urb */
62 if (urb->transfer_buffer) {
63 kfree (urb->transfer_buffer);
64 urb->transfer_buffer = NULL;
65 }
66 return;
67 }
68 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
69
70 tty = port->tty;
71 if (tty && urb->actual_length) {
72 tty_insert_flip_string (tty, data, urb->actual_length);
73 tty_flip_buffer_push (tty);
74 }
75
76 result = usb_submit_urb (urb, GFP_ATOMIC);
77 if (result)
78 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
79 __FUNCTION__, result);
80 return;
81 }
82
83 static void airprime_write_bulk_callback(struct urb *urb)
84 {
85 struct usb_serial_port *port = urb->context;
86 struct airprime_private *priv = usb_get_serial_port_data(port);
87 unsigned long flags;
88
89 dbg("%s - port %d", __FUNCTION__, port->number);
90
91 /* free up the transfer buffer, as usb_free_urb() does not do this */
92 kfree (urb->transfer_buffer);
93
94 if (urb->status)
95 dbg("%s - nonzero write bulk status received: %d",
96 __FUNCTION__, urb->status);
97 spin_lock_irqsave(&priv->lock, flags);
98 --priv->outstanding_urbs;
99 spin_unlock_irqrestore(&priv->lock, flags);
100
101 usb_serial_port_softint(port);
102 }
103
104 static int airprime_open(struct usb_serial_port *port, struct file *filp)
105 {
106 struct airprime_private *priv = usb_get_serial_port_data(port);
107 struct usb_serial *serial = port->serial;
108 struct urb *urb;
109 char *buffer = NULL;
110 int i;
111 int result = 0;
112
113 dbg("%s - port %d", __FUNCTION__, port->number);
114
115 /* initialize our private data structure if it isn't already created */
116 if (!priv) {
117 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
118 if (!priv) {
119 result = -ENOMEM;
120 goto out;
121 }
122 spin_lock_init(&priv->lock);
123 usb_set_serial_port_data(port, priv);
124 }
125
126 for (i = 0; i < NUM_READ_URBS; ++i) {
127 buffer = kmalloc(buffer_size, GFP_KERNEL);
128 if (!buffer) {
129 dev_err(&port->dev, "%s - out of memory.\n",
130 __FUNCTION__);
131 result = -ENOMEM;
132 goto errout;
133 }
134 urb = usb_alloc_urb(0, GFP_KERNEL);
135 if (!urb) {
136 kfree(buffer);
137 dev_err(&port->dev, "%s - no more urbs?\n",
138 __FUNCTION__);
139 result = -ENOMEM;
140 goto errout;
141 }
142 usb_fill_bulk_urb(urb, serial->dev,
143 usb_rcvbulkpipe(serial->dev,
144 port->bulk_out_endpointAddress),
145 buffer, buffer_size,
146 airprime_read_bulk_callback, port);
147 result = usb_submit_urb(urb, GFP_KERNEL);
148 if (result) {
149 dev_err(&port->dev,
150 "%s - failed submitting read urb %d for port %d, error %d\n",
151 __FUNCTION__, i, port->number, result);
152 goto errout;
153 }
154 /* remember this urb so we can kill it when the port is closed */
155 priv->read_urbp[i] = urb;
156 }
157 goto out;
158
159 errout:
160 /* some error happened, cancel any submitted urbs and clean up anything that
161 got allocated successfully */
162
163 for ( ; i >= 0; --i) {
164 urb = priv->read_urbp[i];
165 if (urb) {
166 /* This urb was submitted successfully. So we have to
167 cancel it.
168 Unlinking the urb will invoke read_bulk_callback()
169 with an error status, so its transfer buffer will
170 be freed there */
171 if (usb_unlink_urb (urb) != -EINPROGRESS) {
172 /* comments in drivers/usb/core/urb.c say this
173 can only happen if the urb was never submitted,
174 or has completed already.
175 Either way we may have to free the transfer
176 buffer here. */
177 if (urb->transfer_buffer) {
178 kfree (urb->transfer_buffer);
179 urb->transfer_buffer = NULL;
180 }
181 }
182 usb_free_urb (urb);
183 }
184 }
185
186 out:
187 return result;
188 }
189
190 static void airprime_close(struct usb_serial_port *port, struct file * filp)
191 {
192 struct airprime_private *priv = usb_get_serial_port_data(port);
193 int i;
194
195 dbg("%s - port %d", __FUNCTION__, port->number);
196
197 /* killing the urb will invoke read_bulk_callback() with an error status,
198 so the transfer buffer will be freed there */
199 for (i = 0; i < NUM_READ_URBS; ++i) {
200 usb_kill_urb (priv->read_urbp[i]);
201 usb_free_urb (priv->read_urbp[i]);
202 }
203
204 /* free up private structure */
205 kfree (priv);
206 usb_set_serial_port_data(port, NULL);
207 }
208
209 static int airprime_write(struct usb_serial_port *port,
210 const unsigned char *buf, int count)
211 {
212 struct airprime_private *priv = usb_get_serial_port_data(port);
213 struct usb_serial *serial = port->serial;
214 struct urb *urb;
215 unsigned char *buffer;
216 unsigned long flags;
217 int status;
218 dbg("%s - port %d", __FUNCTION__, port->number);
219
220 spin_lock_irqsave(&priv->lock, flags);
221 if (priv->outstanding_urbs > NUM_WRITE_URBS) {
222 spin_unlock_irqrestore(&priv->lock, flags);
223 dbg("%s - write limit hit\n", __FUNCTION__);
224 return 0;
225 }
226 spin_unlock_irqrestore(&priv->lock, flags);
227 buffer = kmalloc(count, GFP_ATOMIC);
228 if (!buffer) {
229 dev_err(&port->dev, "out of memory\n");
230 return -ENOMEM;
231 }
232 urb = usb_alloc_urb(0, GFP_ATOMIC);
233 if (!urb) {
234 dev_err(&port->dev, "no more free urbs\n");
235 kfree (buffer);
236 return -ENOMEM;
237 }
238 memcpy (buffer, buf, count);
239
240 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
241
242 usb_fill_bulk_urb(urb, serial->dev,
243 usb_sndbulkpipe(serial->dev,
244 port->bulk_out_endpointAddress),
245 buffer, count,
246 airprime_write_bulk_callback, port);
247
248 /* send it down the pipe */
249 status = usb_submit_urb(urb, GFP_ATOMIC);
250 if (status) {
251 dev_err(&port->dev,
252 "%s - usb_submit_urb(write bulk) failed with status = %d\n",
253 __FUNCTION__, status);
254 count = status;
255 kfree (buffer);
256 } else {
257 spin_lock_irqsave(&priv->lock, flags);
258 ++priv->outstanding_urbs;
259 spin_unlock_irqrestore(&priv->lock, flags);
260 }
261 /* we are done with this urb, so let the host driver
262 * really free it when it is finished with it */
263 usb_free_urb (urb);
264 return count;
265 }
266
267 static struct usb_driver airprime_driver = {
268 .name = "airprime",
269 .probe = usb_serial_probe,
270 .disconnect = usb_serial_disconnect,
271 .id_table = id_table,
272 .no_dynamic_id = 1,
273 };
274
275 static struct usb_serial_driver airprime_device = {
276 .driver = {
277 .owner = THIS_MODULE,
278 .name = "airprime",
279 },
280 .usb_driver = &airprime_driver,
281 .id_table = id_table,
282 .num_interrupt_in = NUM_DONT_CARE,
283 .num_bulk_in = NUM_DONT_CARE,
284 .num_bulk_out = NUM_DONT_CARE,
285 .open = airprime_open,
286 .close = airprime_close,
287 .write = airprime_write,
288 };
289
290 static int __init airprime_init(void)
291 {
292 int retval;
293
294 airprime_device.num_ports =
295 (endpoints > 0 && endpoints <= MAX_BULK_EPS) ? endpoints : NUM_BULK_EPS;
296 retval = usb_serial_register(&airprime_device);
297 if (retval)
298 return retval;
299 retval = usb_register(&airprime_driver);
300 if (retval)
301 usb_serial_deregister(&airprime_device);
302 return retval;
303 }
304
305 static void __exit airprime_exit(void)
306 {
307 dbg("%s", __FUNCTION__);
308
309 usb_deregister(&airprime_driver);
310 usb_serial_deregister(&airprime_device);
311 }
312
313 module_init(airprime_init);
314 module_exit(airprime_exit);
315 MODULE_LICENSE("GPL");
316
317 module_param(debug, bool, S_IRUGO | S_IWUSR);
318 MODULE_PARM_DESC(debug, "Debug enabled");
319 module_param(buffer_size, int, 0);
320 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers in bytes (default 4096)");
321 module_param(endpoints, int, 0);
322 MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)");