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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) { | |
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 |