2 * USB Serial Converter Generic functions
4 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
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.
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/tty.h>
16 #include <linux/tty_flip.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/usb.h>
20 #include <linux/usb/serial.h>
21 #include <asm/uaccess.h>
23 static int generic_probe(struct usb_interface
*interface
,
24 const struct usb_device_id
*id
);
29 #ifdef CONFIG_USB_SERIAL_GENERIC
30 static __u16 vendor
= 0x05f9;
31 static __u16 product
= 0xffff;
33 module_param(vendor
, ushort
, 0);
34 MODULE_PARM_DESC(vendor
, "User specified USB idVendor");
36 module_param(product
, ushort
, 0);
37 MODULE_PARM_DESC(product
, "User specified USB idProduct");
39 static struct usb_device_id generic_device_ids
[2]; /* Initially all zeroes. */
41 /* we want to look at all devices, as the vendor/product id can change
42 * depending on the command line argument */
43 static struct usb_device_id generic_serial_ids
[] = {
48 static struct usb_driver generic_driver
= {
49 .name
= "usbserial_generic",
50 .probe
= generic_probe
,
51 .disconnect
= usb_serial_disconnect
,
52 .id_table
= generic_serial_ids
,
56 /* All of the device info needed for the Generic Serial Converter */
57 struct usb_serial_driver usb_serial_generic_device
= {
62 .id_table
= generic_device_ids
,
63 .usb_driver
= &generic_driver
,
64 .num_interrupt_in
= NUM_DONT_CARE
,
65 .num_bulk_in
= NUM_DONT_CARE
,
66 .num_bulk_out
= NUM_DONT_CARE
,
68 .shutdown
= usb_serial_generic_shutdown
,
71 static int generic_probe(struct usb_interface
*interface
,
72 const struct usb_device_id
*id
)
74 const struct usb_device_id
*id_pattern
;
76 id_pattern
= usb_match_id(interface
, generic_device_ids
);
77 if (id_pattern
!= NULL
)
78 return usb_serial_probe(interface
, id
);
83 int usb_serial_generic_register (int _debug
)
88 #ifdef CONFIG_USB_SERIAL_GENERIC
89 generic_device_ids
[0].idVendor
= vendor
;
90 generic_device_ids
[0].idProduct
= product
;
91 generic_device_ids
[0].match_flags
= USB_DEVICE_ID_MATCH_VENDOR
| USB_DEVICE_ID_MATCH_PRODUCT
;
93 /* register our generic driver with ourselves */
94 retval
= usb_serial_register (&usb_serial_generic_device
);
97 retval
= usb_register(&generic_driver
);
99 usb_serial_deregister(&usb_serial_generic_device
);
105 void usb_serial_generic_deregister (void)
107 #ifdef CONFIG_USB_SERIAL_GENERIC
108 /* remove our generic driver */
109 usb_deregister(&generic_driver
);
110 usb_serial_deregister (&usb_serial_generic_device
);
114 int usb_serial_generic_open (struct usb_serial_port
*port
, struct file
*filp
)
116 struct usb_serial
*serial
= port
->serial
;
119 dbg("%s - port %d", __FUNCTION__
, port
->number
);
121 /* force low_latency on so that our tty_push actually forces the data through,
122 otherwise it is scheduled, and with high data rates (like with OHCI) data
125 port
->tty
->low_latency
= 1;
127 /* if we have a bulk interrupt, start reading from it */
128 if (serial
->num_bulk_in
) {
129 /* Start reading from the device */
130 usb_fill_bulk_urb (port
->read_urb
, serial
->dev
,
131 usb_rcvbulkpipe(serial
->dev
, port
->bulk_in_endpointAddress
),
132 port
->read_urb
->transfer_buffer
,
133 port
->read_urb
->transfer_buffer_length
,
134 ((serial
->type
->read_bulk_callback
) ?
135 serial
->type
->read_bulk_callback
:
136 usb_serial_generic_read_bulk_callback
),
138 result
= usb_submit_urb(port
->read_urb
, GFP_KERNEL
);
140 dev_err(&port
->dev
, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__
, result
);
145 EXPORT_SYMBOL_GPL(usb_serial_generic_open
);
147 static void generic_cleanup (struct usb_serial_port
*port
)
149 struct usb_serial
*serial
= port
->serial
;
151 dbg("%s - port %d", __FUNCTION__
, port
->number
);
154 /* shutdown any bulk reads that might be going on */
155 if (serial
->num_bulk_out
)
156 usb_kill_urb(port
->write_urb
);
157 if (serial
->num_bulk_in
)
158 usb_kill_urb(port
->read_urb
);
162 void usb_serial_generic_close (struct usb_serial_port
*port
, struct file
* filp
)
164 dbg("%s - port %d", __FUNCTION__
, port
->number
);
165 generic_cleanup (port
);
168 int usb_serial_generic_write(struct usb_serial_port
*port
, const unsigned char *buf
, int count
)
170 struct usb_serial
*serial
= port
->serial
;
174 dbg("%s - port %d", __FUNCTION__
, port
->number
);
177 dbg("%s - write request of 0 bytes", __FUNCTION__
);
181 /* only do something if we have a bulk out endpoint */
182 if (serial
->num_bulk_out
) {
183 spin_lock_bh(&port
->lock
);
184 if (port
->write_urb_busy
) {
185 spin_unlock_bh(&port
->lock
);
186 dbg("%s - already writing", __FUNCTION__
);
189 port
->write_urb_busy
= 1;
190 spin_unlock_bh(&port
->lock
);
192 count
= (count
> port
->bulk_out_size
) ? port
->bulk_out_size
: count
;
194 memcpy (port
->write_urb
->transfer_buffer
, buf
, count
);
195 data
= port
->write_urb
->transfer_buffer
;
196 usb_serial_debug_data(debug
, &port
->dev
, __FUNCTION__
, count
, data
);
199 usb_fill_bulk_urb (port
->write_urb
, serial
->dev
,
200 usb_sndbulkpipe (serial
->dev
,
201 port
->bulk_out_endpointAddress
),
202 port
->write_urb
->transfer_buffer
, count
,
203 ((serial
->type
->write_bulk_callback
) ?
204 serial
->type
->write_bulk_callback
:
205 usb_serial_generic_write_bulk_callback
), port
);
207 /* send the data out the bulk port */
208 port
->write_urb_busy
= 1;
209 result
= usb_submit_urb(port
->write_urb
, GFP_ATOMIC
);
211 dev_err(&port
->dev
, "%s - failed submitting write urb, error %d\n", __FUNCTION__
, result
);
212 /* don't have to grab the lock here, as we will retry if != 0 */
213 port
->write_urb_busy
= 0;
220 /* no bulk out, so return 0 bytes written */
224 int usb_serial_generic_write_room (struct usb_serial_port
*port
)
226 struct usb_serial
*serial
= port
->serial
;
229 dbg("%s - port %d", __FUNCTION__
, port
->number
);
231 if (serial
->num_bulk_out
) {
232 if (!(port
->write_urb_busy
))
233 room
= port
->bulk_out_size
;
236 dbg("%s - returns %d", __FUNCTION__
, room
);
240 int usb_serial_generic_chars_in_buffer (struct usb_serial_port
*port
)
242 struct usb_serial
*serial
= port
->serial
;
245 dbg("%s - port %d", __FUNCTION__
, port
->number
);
247 if (serial
->num_bulk_out
) {
248 if (port
->write_urb_busy
)
249 chars
= port
->write_urb
->transfer_buffer_length
;
252 dbg("%s - returns %d", __FUNCTION__
, chars
);
256 void usb_serial_generic_read_bulk_callback (struct urb
*urb
)
258 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
259 struct usb_serial
*serial
= port
->serial
;
260 struct tty_struct
*tty
;
261 unsigned char *data
= urb
->transfer_buffer
;
264 dbg("%s - port %d", __FUNCTION__
, port
->number
);
267 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__
, urb
->status
);
271 usb_serial_debug_data(debug
, &port
->dev
, __FUNCTION__
, urb
->actual_length
, data
);
274 if (tty
&& urb
->actual_length
) {
275 tty_buffer_request_room(tty
, urb
->actual_length
);
276 tty_insert_flip_string(tty
, data
, urb
->actual_length
);
277 tty_flip_buffer_push(tty
);
280 /* Continue trying to always read */
281 usb_fill_bulk_urb (port
->read_urb
, serial
->dev
,
282 usb_rcvbulkpipe (serial
->dev
,
283 port
->bulk_in_endpointAddress
),
284 port
->read_urb
->transfer_buffer
,
285 port
->read_urb
->transfer_buffer_length
,
286 ((serial
->type
->read_bulk_callback
) ?
287 serial
->type
->read_bulk_callback
:
288 usb_serial_generic_read_bulk_callback
), port
);
289 result
= usb_submit_urb(port
->read_urb
, GFP_ATOMIC
);
291 dev_err(&port
->dev
, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__
, result
);
293 EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback
);
295 void usb_serial_generic_write_bulk_callback (struct urb
*urb
)
297 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
299 dbg("%s - port %d", __FUNCTION__
, port
->number
);
301 port
->write_urb_busy
= 0;
303 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__
, urb
->status
);
307 usb_serial_port_softint(port
);
309 EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback
);
311 void usb_serial_generic_shutdown (struct usb_serial
*serial
)
315 dbg("%s", __FUNCTION__
);
317 /* stop reads and writes on all ports */
318 for (i
=0; i
< serial
->num_ports
; ++i
) {
319 generic_cleanup(serial
->port
[i
]);