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>
25 #ifdef CONFIG_USB_SERIAL_GENERIC
26 static __u16 vendor
= 0x05f9;
27 static __u16 product
= 0xffff;
29 module_param(vendor
, ushort
, 0);
30 MODULE_PARM_DESC(vendor
, "User specified USB idVendor");
32 module_param(product
, ushort
, 0);
33 MODULE_PARM_DESC(product
, "User specified USB idProduct");
35 static struct usb_device_id generic_device_ids
[2]; /* Initially all zeroes. */
37 /* All of the device info needed for the Generic Serial Converter */
38 struct usb_serial_driver usb_serial_generic_device
= {
43 .id_table
= generic_device_ids
,
44 .num_interrupt_in
= NUM_DONT_CARE
,
45 .num_bulk_in
= NUM_DONT_CARE
,
46 .num_bulk_out
= NUM_DONT_CARE
,
48 .shutdown
= usb_serial_generic_shutdown
,
51 /* we want to look at all devices, as the vendor/product id can change
52 * depending on the command line argument */
53 static struct usb_device_id generic_serial_ids
[] = {
58 static int generic_probe(struct usb_interface
*interface
,
59 const struct usb_device_id
*id
)
61 const struct usb_device_id
*id_pattern
;
63 id_pattern
= usb_match_id(interface
, generic_device_ids
);
64 if (id_pattern
!= NULL
)
65 return usb_serial_probe(interface
, id
);
69 static struct usb_driver generic_driver
= {
70 .name
= "usbserial_generic",
71 .probe
= generic_probe
,
72 .disconnect
= usb_serial_disconnect
,
73 .id_table
= generic_serial_ids
,
78 int usb_serial_generic_register (int _debug
)
83 #ifdef CONFIG_USB_SERIAL_GENERIC
84 generic_device_ids
[0].idVendor
= vendor
;
85 generic_device_ids
[0].idProduct
= product
;
86 generic_device_ids
[0].match_flags
= USB_DEVICE_ID_MATCH_VENDOR
| USB_DEVICE_ID_MATCH_PRODUCT
;
88 /* register our generic driver with ourselves */
89 retval
= usb_serial_register (&usb_serial_generic_device
);
92 retval
= usb_register(&generic_driver
);
94 usb_serial_deregister(&usb_serial_generic_device
);
100 void usb_serial_generic_deregister (void)
102 #ifdef CONFIG_USB_SERIAL_GENERIC
103 /* remove our generic driver */
104 usb_deregister(&generic_driver
);
105 usb_serial_deregister (&usb_serial_generic_device
);
109 int usb_serial_generic_open (struct usb_serial_port
*port
, struct file
*filp
)
111 struct usb_serial
*serial
= port
->serial
;
114 dbg("%s - port %d", __FUNCTION__
, port
->number
);
116 /* force low_latency on so that our tty_push actually forces the data through,
117 otherwise it is scheduled, and with high data rates (like with OHCI) data
120 port
->tty
->low_latency
= 1;
122 /* if we have a bulk interrupt, start reading from it */
123 if (serial
->num_bulk_in
) {
124 /* Start reading from the device */
125 usb_fill_bulk_urb (port
->read_urb
, serial
->dev
,
126 usb_rcvbulkpipe(serial
->dev
, port
->bulk_in_endpointAddress
),
127 port
->read_urb
->transfer_buffer
,
128 port
->read_urb
->transfer_buffer_length
,
129 ((serial
->type
->read_bulk_callback
) ?
130 serial
->type
->read_bulk_callback
:
131 usb_serial_generic_read_bulk_callback
),
133 result
= usb_submit_urb(port
->read_urb
, GFP_KERNEL
);
135 dev_err(&port
->dev
, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__
, result
);
140 EXPORT_SYMBOL_GPL(usb_serial_generic_open
);
142 static void generic_cleanup (struct usb_serial_port
*port
)
144 struct usb_serial
*serial
= port
->serial
;
146 dbg("%s - port %d", __FUNCTION__
, port
->number
);
149 /* shutdown any bulk reads that might be going on */
150 if (serial
->num_bulk_out
)
151 usb_kill_urb(port
->write_urb
);
152 if (serial
->num_bulk_in
)
153 usb_kill_urb(port
->read_urb
);
157 void usb_serial_generic_close (struct usb_serial_port
*port
, struct file
* filp
)
159 dbg("%s - port %d", __FUNCTION__
, port
->number
);
160 generic_cleanup (port
);
163 int usb_serial_generic_write(struct usb_serial_port
*port
, const unsigned char *buf
, int count
)
165 struct usb_serial
*serial
= port
->serial
;
169 dbg("%s - port %d", __FUNCTION__
, port
->number
);
172 dbg("%s - write request of 0 bytes", __FUNCTION__
);
176 /* only do something if we have a bulk out endpoint */
177 if (serial
->num_bulk_out
) {
178 spin_lock_bh(&port
->lock
);
179 if (port
->write_urb_busy
) {
180 spin_unlock_bh(&port
->lock
);
181 dbg("%s - already writing", __FUNCTION__
);
184 port
->write_urb_busy
= 1;
185 spin_unlock_bh(&port
->lock
);
187 count
= (count
> port
->bulk_out_size
) ? port
->bulk_out_size
: count
;
189 memcpy (port
->write_urb
->transfer_buffer
, buf
, count
);
190 data
= port
->write_urb
->transfer_buffer
;
191 usb_serial_debug_data(debug
, &port
->dev
, __FUNCTION__
, count
, data
);
194 usb_fill_bulk_urb (port
->write_urb
, serial
->dev
,
195 usb_sndbulkpipe (serial
->dev
,
196 port
->bulk_out_endpointAddress
),
197 port
->write_urb
->transfer_buffer
, count
,
198 ((serial
->type
->write_bulk_callback
) ?
199 serial
->type
->write_bulk_callback
:
200 usb_serial_generic_write_bulk_callback
), port
);
202 /* send the data out the bulk port */
203 port
->write_urb_busy
= 1;
204 result
= usb_submit_urb(port
->write_urb
, GFP_ATOMIC
);
206 dev_err(&port
->dev
, "%s - failed submitting write urb, error %d\n", __FUNCTION__
, result
);
207 /* don't have to grab the lock here, as we will retry if != 0 */
208 port
->write_urb_busy
= 0;
215 /* no bulk out, so return 0 bytes written */
219 int usb_serial_generic_write_room (struct usb_serial_port
*port
)
221 struct usb_serial
*serial
= port
->serial
;
224 dbg("%s - port %d", __FUNCTION__
, port
->number
);
226 if (serial
->num_bulk_out
) {
227 if (!(port
->write_urb_busy
))
228 room
= port
->bulk_out_size
;
231 dbg("%s - returns %d", __FUNCTION__
, room
);
235 int usb_serial_generic_chars_in_buffer (struct usb_serial_port
*port
)
237 struct usb_serial
*serial
= port
->serial
;
240 dbg("%s - port %d", __FUNCTION__
, port
->number
);
242 if (serial
->num_bulk_out
) {
243 if (port
->write_urb_busy
)
244 chars
= port
->write_urb
->transfer_buffer_length
;
247 dbg("%s - returns %d", __FUNCTION__
, chars
);
251 void usb_serial_generic_read_bulk_callback (struct urb
*urb
)
253 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
254 struct usb_serial
*serial
= port
->serial
;
255 struct tty_struct
*tty
;
256 unsigned char *data
= urb
->transfer_buffer
;
259 dbg("%s - port %d", __FUNCTION__
, port
->number
);
262 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__
, urb
->status
);
266 usb_serial_debug_data(debug
, &port
->dev
, __FUNCTION__
, urb
->actual_length
, data
);
269 if (tty
&& urb
->actual_length
) {
270 tty_buffer_request_room(tty
, urb
->actual_length
);
271 tty_insert_flip_string(tty
, data
, urb
->actual_length
);
272 tty_flip_buffer_push(tty
);
275 /* Continue trying to always read */
276 usb_fill_bulk_urb (port
->read_urb
, serial
->dev
,
277 usb_rcvbulkpipe (serial
->dev
,
278 port
->bulk_in_endpointAddress
),
279 port
->read_urb
->transfer_buffer
,
280 port
->read_urb
->transfer_buffer_length
,
281 ((serial
->type
->read_bulk_callback
) ?
282 serial
->type
->read_bulk_callback
:
283 usb_serial_generic_read_bulk_callback
), port
);
284 result
= usb_submit_urb(port
->read_urb
, GFP_ATOMIC
);
286 dev_err(&port
->dev
, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__
, result
);
288 EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback
);
290 void usb_serial_generic_write_bulk_callback (struct urb
*urb
)
292 struct usb_serial_port
*port
= (struct usb_serial_port
*)urb
->context
;
294 dbg("%s - port %d", __FUNCTION__
, port
->number
);
296 port
->write_urb_busy
= 0;
298 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__
, urb
->status
);
302 usb_serial_port_softint(port
);
304 EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback
);
306 void usb_serial_generic_shutdown (struct usb_serial
*serial
)
310 dbg("%s", __FUNCTION__
);
312 /* stop reads and writes on all ports */
313 for (i
=0; i
< serial
->num_ports
; ++i
) {
314 generic_cleanup(serial
->port
[i
]);