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1da177e4 LT |
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) { | |
507ca9bc GKH |
177 | spin_lock(&port->lock); |
178 | if (port->write_urb_busy) { | |
179 | spin_unlock(&port->lock); | |
1da177e4 | 180 | dbg("%s - already writing", __FUNCTION__); |
507ca9bc | 181 | return 0; |
1da177e4 | 182 | } |
507ca9bc GKH |
183 | port->write_urb_busy = 1; |
184 | spin_unlock(&port->lock); | |
1da177e4 LT |
185 | |
186 | count = (count > port->bulk_out_size) ? port->bulk_out_size : count; | |
187 | ||
188 | memcpy (port->write_urb->transfer_buffer, buf, count); | |
189 | data = port->write_urb->transfer_buffer; | |
190 | usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data); | |
191 | ||
192 | /* set up our urb */ | |
193 | usb_fill_bulk_urb (port->write_urb, serial->dev, | |
194 | usb_sndbulkpipe (serial->dev, | |
195 | port->bulk_out_endpointAddress), | |
196 | port->write_urb->transfer_buffer, count, | |
197 | ((serial->type->write_bulk_callback) ? | |
198 | serial->type->write_bulk_callback : | |
199 | usb_serial_generic_write_bulk_callback), port); | |
200 | ||
201 | /* send the data out the bulk port */ | |
507ca9bc | 202 | port->write_urb_busy = 1; |
1da177e4 | 203 | result = usb_submit_urb(port->write_urb, GFP_ATOMIC); |
507ca9bc | 204 | if (result) { |
1da177e4 | 205 | dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result); |
507ca9bc GKH |
206 | /* don't have to grab the lock here, as we will retry if != 0 */ |
207 | port->write_urb_busy = 0; | |
208 | } else | |
1da177e4 LT |
209 | result = count; |
210 | ||
211 | return result; | |
212 | } | |
213 | ||
214 | /* no bulk out, so return 0 bytes written */ | |
507ca9bc | 215 | return 0; |
1da177e4 LT |
216 | } |
217 | ||
218 | int usb_serial_generic_write_room (struct usb_serial_port *port) | |
219 | { | |
220 | struct usb_serial *serial = port->serial; | |
221 | int room = 0; | |
222 | ||
223 | dbg("%s - port %d", __FUNCTION__, port->number); | |
507ca9bc | 224 | |
1da177e4 | 225 | if (serial->num_bulk_out) { |
507ca9bc | 226 | if (port->write_urb_busy) |
1da177e4 LT |
227 | room = port->bulk_out_size; |
228 | } | |
229 | ||
230 | dbg("%s - returns %d", __FUNCTION__, room); | |
231 | return (room); | |
232 | } | |
233 | ||
234 | int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port) | |
235 | { | |
236 | struct usb_serial *serial = port->serial; | |
237 | int chars = 0; | |
238 | ||
239 | dbg("%s - port %d", __FUNCTION__, port->number); | |
240 | ||
241 | if (serial->num_bulk_out) { | |
507ca9bc | 242 | if (port->write_urb_busy) |
1da177e4 LT |
243 | chars = port->write_urb->transfer_buffer_length; |
244 | } | |
245 | ||
246 | dbg("%s - returns %d", __FUNCTION__, chars); | |
247 | return (chars); | |
248 | } | |
249 | ||
250 | void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs) | |
251 | { | |
252 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
253 | struct usb_serial *serial = port->serial; | |
254 | struct tty_struct *tty; | |
255 | unsigned char *data = urb->transfer_buffer; | |
256 | int i; | |
257 | int result; | |
258 | ||
259 | dbg("%s - port %d", __FUNCTION__, port->number); | |
260 | ||
261 | if (urb->status) { | |
262 | dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status); | |
263 | return; | |
264 | } | |
265 | ||
266 | usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); | |
267 | ||
268 | tty = port->tty; | |
269 | if (tty && urb->actual_length) { | |
270 | for (i = 0; i < urb->actual_length ; ++i) { | |
271 | /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */ | |
272 | if(tty->flip.count >= TTY_FLIPBUF_SIZE) { | |
273 | tty_flip_buffer_push(tty); | |
274 | } | |
275 | /* this doesn't actually push the data through unless tty->low_latency is set */ | |
276 | tty_insert_flip_char(tty, data[i], 0); | |
277 | } | |
278 | tty_flip_buffer_push(tty); | |
279 | } | |
280 | ||
281 | /* Continue trying to always read */ | |
282 | usb_fill_bulk_urb (port->read_urb, serial->dev, | |
283 | usb_rcvbulkpipe (serial->dev, | |
284 | port->bulk_in_endpointAddress), | |
285 | port->read_urb->transfer_buffer, | |
286 | port->read_urb->transfer_buffer_length, | |
287 | ((serial->type->read_bulk_callback) ? | |
288 | serial->type->read_bulk_callback : | |
289 | usb_serial_generic_read_bulk_callback), port); | |
290 | result = usb_submit_urb(port->read_urb, GFP_ATOMIC); | |
291 | if (result) | |
292 | dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); | |
293 | } | |
294 | ||
295 | void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs) | |
296 | { | |
297 | struct usb_serial_port *port = (struct usb_serial_port *)urb->context; | |
298 | ||
299 | dbg("%s - port %d", __FUNCTION__, port->number); | |
300 | ||
507ca9bc | 301 | port->write_urb_busy = 0; |
1da177e4 LT |
302 | if (urb->status) { |
303 | dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status); | |
304 | return; | |
305 | } | |
306 | ||
307 | usb_serial_port_softint((void *)port); | |
308 | ||
309 | schedule_work(&port->work); | |
310 | } | |
311 | ||
312 | void usb_serial_generic_shutdown (struct usb_serial *serial) | |
313 | { | |
314 | int i; | |
315 | ||
316 | dbg("%s", __FUNCTION__); | |
317 | ||
318 | /* stop reads and writes on all ports */ | |
319 | for (i=0; i < serial->num_ports; ++i) { | |
320 | generic_cleanup(serial->port[i]); | |
321 | } | |
322 | } | |
323 |