2 * Symbol USB barcode to serial driver
4 * Copyright (C) 2009 Greg Kroah-Hartman <gregkh@suse.de>
5 * Copyright (C) 2009 Novell Inc.
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.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/tty.h>
15 #include <linux/slab.h>
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>
25 static const struct usb_device_id id_table
[] = {
26 { USB_DEVICE(0x05e0, 0x0600) },
29 MODULE_DEVICE_TABLE(usb
, id_table
);
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
;
41 spinlock_t lock
; /* protects the following flags */
43 bool actually_throttled
;
47 static void symbol_int_callback(struct urb
*urb
)
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
;
64 /* this urb is terminated, clean up */
65 dev_dbg(&port
->dev
, "%s - urb shutting down with status: %d\n",
69 dev_dbg(&port
->dev
, "%s - nonzero urb status received: %d\n",
74 usb_serial_debug_data(&port
->dev
, __func__
, urb
->actual_length
, data
);
76 if (urb
->actual_length
> 1) {
77 data_length
= urb
->actual_length
- 1;
80 * Data from the device comes with a 1 byte header:
82 * <size of data>data...
83 * This is real data to be sent to the tty layer
84 * we pretty much just ignore the size and send everything
85 * else to the tty layer.
87 tty
= tty_port_tty_get(&port
->port
);
89 tty_insert_flip_string(tty
, &data
[1], data_length
);
90 tty_flip_buffer_push(tty
);
94 dev_dbg(&priv
->udev
->dev
,
95 "Improper amount of data received from the device, "
96 "%d bytes", urb
->actual_length
);
100 spin_lock(&priv
->lock
);
102 /* Continue trying to always read if we should */
103 if (!priv
->throttled
) {
104 usb_fill_int_urb(priv
->int_urb
, priv
->udev
,
105 usb_rcvintpipe(priv
->udev
,
107 priv
->int_buffer
, priv
->buffer_size
,
108 symbol_int_callback
, priv
, priv
->bInterval
);
109 result
= usb_submit_urb(priv
->int_urb
, GFP_ATOMIC
);
112 "%s - failed resubmitting read urb, error %d\n",
115 priv
->actually_throttled
= true;
116 spin_unlock(&priv
->lock
);
119 static int symbol_open(struct tty_struct
*tty
, struct usb_serial_port
*port
)
121 struct symbol_private
*priv
= usb_get_serial_data(port
->serial
);
125 spin_lock_irqsave(&priv
->lock
, flags
);
126 priv
->throttled
= false;
127 priv
->actually_throttled
= false;
129 spin_unlock_irqrestore(&priv
->lock
, flags
);
131 /* Start reading from the device */
132 usb_fill_int_urb(priv
->int_urb
, priv
->udev
,
133 usb_rcvintpipe(priv
->udev
, priv
->int_address
),
134 priv
->int_buffer
, priv
->buffer_size
,
135 symbol_int_callback
, priv
, priv
->bInterval
);
136 result
= usb_submit_urb(priv
->int_urb
, GFP_KERNEL
);
139 "%s - failed resubmitting read urb, error %d\n",
144 static void symbol_close(struct usb_serial_port
*port
)
146 struct symbol_private
*priv
= usb_get_serial_data(port
->serial
);
148 /* shutdown our urbs */
149 usb_kill_urb(priv
->int_urb
);
152 static void symbol_throttle(struct tty_struct
*tty
)
154 struct usb_serial_port
*port
= tty
->driver_data
;
155 struct symbol_private
*priv
= usb_get_serial_data(port
->serial
);
157 spin_lock_irq(&priv
->lock
);
158 priv
->throttled
= true;
159 spin_unlock_irq(&priv
->lock
);
162 static void symbol_unthrottle(struct tty_struct
*tty
)
164 struct usb_serial_port
*port
= tty
->driver_data
;
165 struct symbol_private
*priv
= usb_get_serial_data(port
->serial
);
169 spin_lock_irq(&priv
->lock
);
170 priv
->throttled
= false;
171 was_throttled
= priv
->actually_throttled
;
172 priv
->actually_throttled
= false;
173 spin_unlock_irq(&priv
->lock
);
176 result
= usb_submit_urb(priv
->int_urb
, GFP_KERNEL
);
179 "%s - failed submitting read urb, error %d\n",
184 static int symbol_startup(struct usb_serial
*serial
)
186 struct symbol_private
*priv
;
187 struct usb_host_interface
*intf
;
189 int retval
= -ENOMEM
;
190 bool int_in_found
= false;
192 /* create our private serial structure */
193 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
195 dev_err(&serial
->dev
->dev
, "%s - Out of memory\n", __func__
);
198 spin_lock_init(&priv
->lock
);
199 priv
->serial
= serial
;
200 priv
->port
= serial
->port
[0];
201 priv
->udev
= serial
->dev
;
203 /* find our interrupt endpoint */
204 intf
= serial
->interface
->altsetting
;
205 for (i
= 0; i
< intf
->desc
.bNumEndpoints
; ++i
) {
206 struct usb_endpoint_descriptor
*endpoint
;
208 endpoint
= &intf
->endpoint
[i
].desc
;
209 if (!usb_endpoint_is_int_in(endpoint
))
212 priv
->int_urb
= usb_alloc_urb(0, GFP_KERNEL
);
213 if (!priv
->int_urb
) {
214 dev_err(&priv
->udev
->dev
, "out of memory\n");
218 priv
->buffer_size
= usb_endpoint_maxp(endpoint
) * 2;
219 priv
->int_buffer
= kmalloc(priv
->buffer_size
, GFP_KERNEL
);
220 if (!priv
->int_buffer
) {
221 dev_err(&priv
->udev
->dev
, "out of memory\n");
225 priv
->int_address
= endpoint
->bEndpointAddress
;
226 priv
->bInterval
= endpoint
->bInterval
;
228 /* set up our int urb */
229 usb_fill_int_urb(priv
->int_urb
, priv
->udev
,
230 usb_rcvintpipe(priv
->udev
,
231 endpoint
->bEndpointAddress
),
232 priv
->int_buffer
, priv
->buffer_size
,
233 symbol_int_callback
, priv
, priv
->bInterval
);
240 dev_err(&priv
->udev
->dev
,
241 "Error - the proper endpoints were not found!\n");
245 usb_set_serial_data(serial
, priv
);
249 usb_free_urb(priv
->int_urb
);
250 kfree(priv
->int_buffer
);
255 static void symbol_disconnect(struct usb_serial
*serial
)
257 struct symbol_private
*priv
= usb_get_serial_data(serial
);
259 usb_kill_urb(priv
->int_urb
);
260 usb_free_urb(priv
->int_urb
);
263 static void symbol_release(struct usb_serial
*serial
)
265 struct symbol_private
*priv
= usb_get_serial_data(serial
);
267 kfree(priv
->int_buffer
);
271 static struct usb_serial_driver symbol_device
= {
273 .owner
= THIS_MODULE
,
276 .id_table
= id_table
,
278 .attach
= symbol_startup
,
280 .close
= symbol_close
,
281 .disconnect
= symbol_disconnect
,
282 .release
= symbol_release
,
283 .throttle
= symbol_throttle
,
284 .unthrottle
= symbol_unthrottle
,
287 static struct usb_serial_driver
* const serial_drivers
[] = {
291 module_usb_serial_driver(serial_drivers
, id_table
);
293 MODULE_LICENSE("GPL");
295 module_param(debug
, bool, S_IRUGO
| S_IWUSR
);
296 MODULE_PARM_DESC(debug
, "Debug enabled or not");