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68b44eae GKH |
1 | /* |
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> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
68b44eae GKH |
16 | #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 | ||
23 | static int debug; | |
24 | ||
7d40d7e8 | 25 | static const struct usb_device_id id_table[] = { |
68b44eae GKH |
26 | { USB_DEVICE(0x05e0, 0x0600) }, |
27 | { }, | |
28 | }; | |
29 | MODULE_DEVICE_TABLE(usb, id_table); | |
30 | ||
31 | /* This structure holds all of the individual device information */ | |
32 | struct 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 | ||
47 | static 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; | |
68b44eae GKH |
55 | 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) { | |
a108bfcb AC |
92 | tty_insert_flip_string(tty, &data[1], data_length); |
93 | tty_flip_buffer_push(tty); | |
68b44eae GKH |
94 | tty_kref_put(tty); |
95 | } | |
96 | } else { | |
97 | dev_dbg(&priv->udev->dev, | |
9ddc5b6f | 98 | "Improper amount of data received from the device, " |
68b44eae GKH |
99 | "%d bytes", urb->actual_length); |
100 | } | |
101 | ||
102 | exit: | |
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 | ||
a509a7e4 | 122 | static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port) |
68b44eae GKH |
123 | { |
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 | ||
68b44eae GKH |
136 | /* 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 | ||
335f8514 | 149 | static void symbol_close(struct usb_serial_port *port) |
68b44eae GKH |
150 | { |
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 | ||
159 | static 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); | |
68b44eae GKH |
163 | |
164 | dbg("%s - port %d", __func__, port->number); | |
63832515 | 165 | spin_lock_irq(&priv->lock); |
68b44eae | 166 | priv->throttled = true; |
63832515 | 167 | spin_unlock_irq(&priv->lock); |
68b44eae GKH |
168 | } |
169 | ||
170 | static 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); | |
68b44eae | 174 | int result; |
b2a5cf1b | 175 | bool was_throttled; |
68b44eae GKH |
176 | |
177 | dbg("%s - port %d", __func__, port->number); | |
178 | ||
63832515 | 179 | spin_lock_irq(&priv->lock); |
68b44eae | 180 | priv->throttled = false; |
b2a5cf1b | 181 | was_throttled = priv->actually_throttled; |
68b44eae | 182 | priv->actually_throttled = false; |
63832515 | 183 | spin_unlock_irq(&priv->lock); |
68b44eae GKH |
184 | |
185 | priv->int_urb->dev = port->serial->dev; | |
b2a5cf1b | 186 | if (was_throttled) { |
63832515 | 187 | result = usb_submit_urb(priv->int_urb, GFP_KERNEL); |
b2a5cf1b ON |
188 | if (result) |
189 | dev_err(&port->dev, | |
190 | "%s - failed submitting read urb, error %d\n", | |
68b44eae | 191 | __func__, result); |
b2a5cf1b | 192 | } |
68b44eae GKH |
193 | } |
194 | ||
195 | static 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 | ||
29cc8897 | 229 | priv->buffer_size = usb_endpoint_maxp(endpoint) * 2; |
68b44eae GKH |
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 | ||
259 | error: | |
260 | usb_free_urb(priv->int_urb); | |
261 | kfree(priv->int_buffer); | |
262 | kfree(priv); | |
263 | return retval; | |
264 | } | |
265 | ||
f9c99bb8 | 266 | static void symbol_disconnect(struct usb_serial *serial) |
68b44eae GKH |
267 | { |
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); | |
f9c99bb8 AS |
274 | } |
275 | ||
276 | static void symbol_release(struct usb_serial *serial) | |
277 | { | |
278 | struct symbol_private *priv = usb_get_serial_data(serial); | |
279 | ||
280 | dbg("%s", __func__); | |
281 | ||
68b44eae GKH |
282 | kfree(priv->int_buffer); |
283 | kfree(priv); | |
68b44eae GKH |
284 | } |
285 | ||
286 | static 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 | ||
294 | static 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, | |
f9c99bb8 AS |
305 | .disconnect = symbol_disconnect, |
306 | .release = symbol_release, | |
68b44eae GKH |
307 | .throttle = symbol_throttle, |
308 | .unthrottle = symbol_unthrottle, | |
309 | }; | |
310 | ||
311 | static 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 | ||
324 | static void __exit symbol_exit(void) | |
325 | { | |
326 | usb_deregister(&symbol_driver); | |
327 | usb_serial_deregister(&symbol_device); | |
328 | } | |
329 | ||
330 | module_init(symbol_init); | |
331 | module_exit(symbol_exit); | |
332 | MODULE_LICENSE("GPL"); | |
333 | ||
334 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
335 | MODULE_PARM_DESC(debug, "Debug enabled or not"); |