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Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -08001/*
2 * Symbol USB barcode to serial driver
3 *
4 * Copyright (C) 2009 Greg Kroah-Hartman <gregkh@suse.de>
5 * Copyright (C) 2009 Novell Inc.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
10 */
11
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/tty.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -080016#include <linux/tty_driver.h>
17#include <linux/tty_flip.h>
18#include <linux/module.h>
19#include <linux/usb.h>
20#include <linux/usb/serial.h>
21#include <linux/uaccess.h>
22
23static int debug;
24
Németh Márton7d40d7e2010-01-10 15:34:24 +010025static const struct usb_device_id id_table[] = {
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -080026 { USB_DEVICE(0x05e0, 0x0600) },
27 { },
28};
29MODULE_DEVICE_TABLE(usb, id_table);
30
31/* This structure holds all of the individual device information */
32struct symbol_private {
33 struct usb_device *udev;
34 struct usb_serial *serial;
35 struct usb_serial_port *port;
36 unsigned char *int_buffer;
37 struct urb *int_urb;
38 int buffer_size;
39 u8 bInterval;
40 u8 int_address;
41 spinlock_t lock; /* protects the following flags */
42 bool throttled;
43 bool actually_throttled;
44 bool rts;
45};
46
47static void symbol_int_callback(struct urb *urb)
48{
49 struct symbol_private *priv = urb->context;
50 unsigned char *data = urb->transfer_buffer;
51 struct usb_serial_port *port = priv->port;
52 int status = urb->status;
53 struct tty_struct *tty;
54 int result;
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -080055 int data_length;
56
57 dbg("%s - port %d", __func__, port->number);
58
59 switch (status) {
60 case 0:
61 /* success */
62 break;
63 case -ECONNRESET:
64 case -ENOENT:
65 case -ESHUTDOWN:
66 /* this urb is terminated, clean up */
67 dbg("%s - urb shutting down with status: %d",
68 __func__, status);
69 return;
70 default:
71 dbg("%s - nonzero urb status received: %d",
72 __func__, status);
73 goto exit;
74 }
75
76 usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
77 data);
78
79 if (urb->actual_length > 1) {
80 data_length = urb->actual_length - 1;
81
82 /*
83 * Data from the device comes with a 1 byte header:
84 *
85 * <size of data>data...
86 * This is real data to be sent to the tty layer
87 * we pretty much just ignore the size and send everything
88 * else to the tty layer.
89 */
90 tty = tty_port_tty_get(&port->port);
91 if (tty) {
Alan Coxa108bfc2010-02-18 16:44:01 +000092 tty_insert_flip_string(tty, &data[1], data_length);
93 tty_flip_buffer_push(tty);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -080094 tty_kref_put(tty);
95 }
96 } else {
97 dev_dbg(&priv->udev->dev,
Uwe Kleine-König9ddc5b62010-01-20 17:02:24 +010098 "Improper amount of data received from the device, "
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -080099 "%d bytes", urb->actual_length);
100 }
101
102exit:
103 spin_lock(&priv->lock);
104
105 /* Continue trying to always read if we should */
106 if (!priv->throttled) {
107 usb_fill_int_urb(priv->int_urb, priv->udev,
108 usb_rcvintpipe(priv->udev,
109 priv->int_address),
110 priv->int_buffer, priv->buffer_size,
111 symbol_int_callback, priv, priv->bInterval);
112 result = usb_submit_urb(priv->int_urb, GFP_ATOMIC);
113 if (result)
114 dev_err(&port->dev,
115 "%s - failed resubmitting read urb, error %d\n",
116 __func__, result);
117 } else
118 priv->actually_throttled = true;
119 spin_unlock(&priv->lock);
120}
121
Alan Coxa509a7e2009-09-19 13:13:26 -0700122static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port)
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800123{
124 struct symbol_private *priv = usb_get_serial_data(port->serial);
125 unsigned long flags;
126 int result = 0;
127
128 dbg("%s - port %d", __func__, port->number);
129
130 spin_lock_irqsave(&priv->lock, flags);
131 priv->throttled = false;
132 priv->actually_throttled = false;
133 priv->port = port;
134 spin_unlock_irqrestore(&priv->lock, flags);
135
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800136 /* Start reading from the device */
137 usb_fill_int_urb(priv->int_urb, priv->udev,
138 usb_rcvintpipe(priv->udev, priv->int_address),
139 priv->int_buffer, priv->buffer_size,
140 symbol_int_callback, priv, priv->bInterval);
141 result = usb_submit_urb(priv->int_urb, GFP_KERNEL);
142 if (result)
143 dev_err(&port->dev,
144 "%s - failed resubmitting read urb, error %d\n",
145 __func__, result);
146 return result;
147}
148
Alan Cox335f8512009-06-11 12:26:29 +0100149static void symbol_close(struct usb_serial_port *port)
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800150{
151 struct symbol_private *priv = usb_get_serial_data(port->serial);
152
153 dbg("%s - port %d", __func__, port->number);
154
155 /* shutdown our urbs */
156 usb_kill_urb(priv->int_urb);
157}
158
159static void symbol_throttle(struct tty_struct *tty)
160{
161 struct usb_serial_port *port = tty->driver_data;
162 struct symbol_private *priv = usb_get_serial_data(port->serial);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800163
164 dbg("%s - port %d", __func__, port->number);
Oliver Neukum63832512009-10-07 10:50:23 +0200165 spin_lock_irq(&priv->lock);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800166 priv->throttled = true;
Oliver Neukum63832512009-10-07 10:50:23 +0200167 spin_unlock_irq(&priv->lock);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800168}
169
170static void symbol_unthrottle(struct tty_struct *tty)
171{
172 struct usb_serial_port *port = tty->driver_data;
173 struct symbol_private *priv = usb_get_serial_data(port->serial);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800174 int result;
Oliver Neukumb2a5cf12009-10-07 09:30:49 +0200175 bool was_throttled;
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800176
177 dbg("%s - port %d", __func__, port->number);
178
Oliver Neukum63832512009-10-07 10:50:23 +0200179 spin_lock_irq(&priv->lock);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800180 priv->throttled = false;
Oliver Neukumb2a5cf12009-10-07 09:30:49 +0200181 was_throttled = priv->actually_throttled;
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800182 priv->actually_throttled = false;
Oliver Neukum63832512009-10-07 10:50:23 +0200183 spin_unlock_irq(&priv->lock);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800184
185 priv->int_urb->dev = port->serial->dev;
Oliver Neukumb2a5cf12009-10-07 09:30:49 +0200186 if (was_throttled) {
Oliver Neukum63832512009-10-07 10:50:23 +0200187 result = usb_submit_urb(priv->int_urb, GFP_KERNEL);
Oliver Neukumb2a5cf12009-10-07 09:30:49 +0200188 if (result)
189 dev_err(&port->dev,
190 "%s - failed submitting read urb, error %d\n",
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800191 __func__, result);
Oliver Neukumb2a5cf12009-10-07 09:30:49 +0200192 }
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800193}
194
195static int symbol_startup(struct usb_serial *serial)
196{
197 struct symbol_private *priv;
198 struct usb_host_interface *intf;
199 int i;
200 int retval = -ENOMEM;
201 bool int_in_found = false;
202
203 /* create our private serial structure */
204 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
205 if (priv == NULL) {
206 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
207 return -ENOMEM;
208 }
209 spin_lock_init(&priv->lock);
210 priv->serial = serial;
211 priv->port = serial->port[0];
212 priv->udev = serial->dev;
213
214 /* find our interrupt endpoint */
215 intf = serial->interface->altsetting;
216 for (i = 0; i < intf->desc.bNumEndpoints; ++i) {
217 struct usb_endpoint_descriptor *endpoint;
218
219 endpoint = &intf->endpoint[i].desc;
220 if (!usb_endpoint_is_int_in(endpoint))
221 continue;
222
223 priv->int_urb = usb_alloc_urb(0, GFP_KERNEL);
224 if (!priv->int_urb) {
225 dev_err(&priv->udev->dev, "out of memory\n");
226 goto error;
227 }
228
229 priv->buffer_size = le16_to_cpu(endpoint->wMaxPacketSize) * 2;
230 priv->int_buffer = kmalloc(priv->buffer_size, GFP_KERNEL);
231 if (!priv->int_buffer) {
232 dev_err(&priv->udev->dev, "out of memory\n");
233 goto error;
234 }
235
236 priv->int_address = endpoint->bEndpointAddress;
237 priv->bInterval = endpoint->bInterval;
238
239 /* set up our int urb */
240 usb_fill_int_urb(priv->int_urb, priv->udev,
241 usb_rcvintpipe(priv->udev,
242 endpoint->bEndpointAddress),
243 priv->int_buffer, priv->buffer_size,
244 symbol_int_callback, priv, priv->bInterval);
245
246 int_in_found = true;
247 break;
248 }
249
250 if (!int_in_found) {
251 dev_err(&priv->udev->dev,
252 "Error - the proper endpoints were not found!\n");
253 goto error;
254 }
255
256 usb_set_serial_data(serial, priv);
257 return 0;
258
259error:
260 usb_free_urb(priv->int_urb);
261 kfree(priv->int_buffer);
262 kfree(priv);
263 return retval;
264}
265
Alan Sternf9c99bb2009-06-02 11:53:55 -0400266static void symbol_disconnect(struct usb_serial *serial)
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800267{
268 struct symbol_private *priv = usb_get_serial_data(serial);
269
270 dbg("%s", __func__);
271
272 usb_kill_urb(priv->int_urb);
273 usb_free_urb(priv->int_urb);
Alan Sternf9c99bb2009-06-02 11:53:55 -0400274}
275
276static void symbol_release(struct usb_serial *serial)
277{
278 struct symbol_private *priv = usb_get_serial_data(serial);
279
280 dbg("%s", __func__);
281
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800282 kfree(priv->int_buffer);
283 kfree(priv);
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800284}
285
286static struct usb_driver symbol_driver = {
287 .name = "symbol",
288 .probe = usb_serial_probe,
289 .disconnect = usb_serial_disconnect,
290 .id_table = id_table,
291 .no_dynamic_id = 1,
292};
293
294static struct usb_serial_driver symbol_device = {
295 .driver = {
296 .owner = THIS_MODULE,
297 .name = "symbol",
298 },
299 .id_table = id_table,
300 .usb_driver = &symbol_driver,
301 .num_ports = 1,
302 .attach = symbol_startup,
303 .open = symbol_open,
304 .close = symbol_close,
Alan Sternf9c99bb2009-06-02 11:53:55 -0400305 .disconnect = symbol_disconnect,
306 .release = symbol_release,
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800307 .throttle = symbol_throttle,
308 .unthrottle = symbol_unthrottle,
Greg Kroah-Hartman68b44ea2009-02-13 17:25:46 -0800309};
310
311static int __init symbol_init(void)
312{
313 int retval;
314
315 retval = usb_serial_register(&symbol_device);
316 if (retval)
317 return retval;
318 retval = usb_register(&symbol_driver);
319 if (retval)
320 usb_serial_deregister(&symbol_device);
321 return retval;
322}
323
324static void __exit symbol_exit(void)
325{
326 usb_deregister(&symbol_driver);
327 usb_serial_deregister(&symbol_device);
328}
329
330module_init(symbol_init);
331module_exit(symbol_exit);
332MODULE_LICENSE("GPL");
333
334module_param(debug, bool, S_IRUGO | S_IWUSR);
335MODULE_PARM_DESC(debug, "Debug enabled or not");