1 /*
2 * USB Serial Converter Generic functions
3 *
4 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
5 *
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.
9 *
10 */
11
12 #include <linux/config.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/slab.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/usb.h>
21 #include <asm/uaccess.h>
22 #include "usb-serial.h"
23
24 static int debug;
25
26 #ifdef CONFIG_USB_SERIAL_GENERIC
27 static __u16 vendor = 0x05f9;
28 static __u16 product = 0xffff;
29
30 module_param(vendor, ushort, 0);
31 MODULE_PARM_DESC(vendor, "User specified USB idVendor");
32
33 module_param(product, ushort, 0);
34 MODULE_PARM_DESC(product, "User specified USB idProduct");
35
36 static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */
37
38 /* All of the device info needed for the Generic Serial Converter */
39 struct usb_serial_device_type usb_serial_generic_device = {
40 .owner = THIS_MODULE,
41 .name = "Generic",
42 .short_name = "generic",
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,
47 .num_ports = 1,
48 .shutdown = usb_serial_generic_shutdown,
49 };
50
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[] = {
54 {.driver_info = 42},
55 {}
56 };
57
58 static int generic_probe(struct usb_interface *interface,
59 const struct usb_device_id *id)
60 {
61 const struct usb_device_id *id_pattern;
62
63 id_pattern = usb_match_id(interface, generic_device_ids);
64 if (id_pattern != NULL)
65 return usb_serial_probe(interface, id);
66 return -ENODEV;
67 }
68
69 static struct usb_driver generic_driver = {
70 .owner = THIS_MODULE,
71 .name = "usbserial_generic",
72 .probe = generic_probe,
73 .disconnect = usb_serial_disconnect,
74 .id_table = generic_serial_ids,
75 };
76 #endif
77
78 int usb_serial_generic_register (int _debug)
79 {
80 int retval = 0;
81
82 debug = _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;
87
88 /* register our generic driver with ourselves */
89 retval = usb_serial_register (&usb_serial_generic_device);
90 if (retval)
91 goto exit;
92 retval = usb_register(&generic_driver);
93 if (retval)
94 usb_serial_deregister(&usb_serial_generic_device);
95 exit:
96 #endif
97 return retval;
98 }
99
100 void usb_serial_generic_deregister (void)
101 {
102 #ifdef CONFIG_USB_SERIAL_GENERIC
103 /* remove our generic driver */
104 usb_deregister(&generic_driver);
105 usb_serial_deregister (&usb_serial_generic_device);
106 #endif
107 }
108
109 int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp)
110 {
111 struct usb_serial *serial = port->serial;
112 int result = 0;
113
114 dbg("%s - port %d", __FUNCTION__, port->number);
115
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
118 can get lost. */
119 if (port->tty)
120 port->tty->low_latency = 1;
121
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),
132 port);
133 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
134 if (result)
135 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
136 }
137
138 return result;
139 }
140
141 static void generic_cleanup (struct usb_serial_port *port)
142 {
143 struct usb_serial *serial = port->serial;
144
145 dbg("%s - port %d", __FUNCTION__, port->number);
146
147 if (serial->dev) {
148 /* shutdown any bulk reads that might be going on */
149 if (serial->num_bulk_out)
150 usb_kill_urb(port->write_urb);
151 if (serial->num_bulk_in)
152 usb_kill_urb(port->read_urb);
153 }
154 }
155
156 void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp)
157 {
158 dbg("%s - port %d", __FUNCTION__, port->number);
159 generic_cleanup (port);
160 }
161
162 int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *buf, int count)
163 {
164 struct usb_serial *serial = port->serial;
165 int result;
166 unsigned char *data;
167
168 dbg("%s - port %d", __FUNCTION__, port->number);
169
170 if (count == 0) {
171 dbg("%s - write request of 0 bytes", __FUNCTION__);
172 return (0);
173 }
174
175 /* only do something if we have a bulk out endpoint */
176 if (serial->num_bulk_out) {
177 if (port->write_urb->status == -EINPROGRESS) {
178 dbg("%s - already writing", __FUNCTION__);
179 return (0);
180 }
181
182 count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
183
184 memcpy (port->write_urb->transfer_buffer, buf, count);
185 data = port->write_urb->transfer_buffer;
186 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data);
187
188 /* set up our urb */
189 usb_fill_bulk_urb (port->write_urb, serial->dev,
190 usb_sndbulkpipe (serial->dev,
191 port->bulk_out_endpointAddress),
192 port->write_urb->transfer_buffer, count,
193 ((serial->type->write_bulk_callback) ?
194 serial->type->write_bulk_callback :
195 usb_serial_generic_write_bulk_callback), port);
196
197 /* send the data out the bulk port */
198 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
199 if (result)
200 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
201 else
202 result = count;
203
204 return result;
205 }
206
207 /* no bulk out, so return 0 bytes written */
208 return (0);
209 }
210
211 int usb_serial_generic_write_room (struct usb_serial_port *port)
212 {
213 struct usb_serial *serial = port->serial;
214 int room = 0;
215
216 dbg("%s - port %d", __FUNCTION__, port->number);
217
218 if (serial->num_bulk_out) {
219 if (port->write_urb->status != -EINPROGRESS)
220 room = port->bulk_out_size;
221 }
222
223 dbg("%s - returns %d", __FUNCTION__, room);
224 return (room);
225 }
226
227 int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port)
228 {
229 struct usb_serial *serial = port->serial;
230 int chars = 0;
231
232 dbg("%s - port %d", __FUNCTION__, port->number);
233
234 if (serial->num_bulk_out) {
235 if (port->write_urb->status == -EINPROGRESS)
236 chars = port->write_urb->transfer_buffer_length;
237 }
238
239 dbg("%s - returns %d", __FUNCTION__, chars);
240 return (chars);
241 }
242
243 void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
244 {
245 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
246 struct usb_serial *serial = port->serial;
247 struct tty_struct *tty;
248 unsigned char *data = urb->transfer_buffer;
249 int i;
250 int result;
251
252 dbg("%s - port %d", __FUNCTION__, port->number);
253
254 if (urb->status) {
255 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
256 return;
257 }
258
259 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
260
261 tty = port->tty;
262 if (tty && urb->actual_length) {
263 for (i = 0; i < urb->actual_length ; ++i) {
264 /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */
265 if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
266 tty_flip_buffer_push(tty);
267 }
268 /* this doesn't actually push the data through unless tty->low_latency is set */
269 tty_insert_flip_char(tty, data[i], 0);
270 }
271 tty_flip_buffer_push(tty);
272 }
273
274 /* Continue trying to always read */
275 usb_fill_bulk_urb (port->read_urb, serial->dev,
276 usb_rcvbulkpipe (serial->dev,
277 port->bulk_in_endpointAddress),
278 port->read_urb->transfer_buffer,
279 port->read_urb->transfer_buffer_length,
280 ((serial->type->read_bulk_callback) ?
281 serial->type->read_bulk_callback :
282 usb_serial_generic_read_bulk_callback), port);
283 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
284 if (result)
285 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
286 }
287
288 void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
289 {
290 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
291
292 dbg("%s - port %d", __FUNCTION__, port->number);
293
294 if (urb->status) {
295 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
296 return;
297 }
298
299 usb_serial_port_softint((void *)port);
300
301 schedule_work(&port->work);
302 }
303
304 void usb_serial_generic_shutdown (struct usb_serial *serial)
305 {
306 int i;
307
308 dbg("%s", __FUNCTION__);
309
310 /* stop reads and writes on all ports */
311 for (i=0; i < serial->num_ports; ++i) {
312 generic_cleanup(serial->port[i]);
313 }
314 }
315
316
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