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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Opticon USB barcode to serial driver
4 *
5 * Copyright (C) 2011 - 2012 Johan Hovold <jhovold@gmail.com>
6 * Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>
7 * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
8 * Copyright (C) 2008 - 2009 Novell Inc.
9 */
10
11#include <linux/kernel.h>
12#include <linux/tty.h>
13#include <linux/tty_driver.h>
14#include <linux/slab.h>
15#include <linux/tty_flip.h>
16#include <linux/serial.h>
17#include <linux/module.h>
18#include <linux/usb.h>
19#include <linux/usb/serial.h>
20#include <linux/uaccess.h>
21
22#define CONTROL_RTS 0x02
23#define RESEND_CTS_STATE 0x03
24
25/* max number of write urbs in flight */
26#define URB_UPPER_LIMIT 8
27
28/* This driver works for the Opticon 1D barcode reader
29 * an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */
30#define DRIVER_DESC "Opticon USB barcode to serial driver (1D)"
31
32static const struct usb_device_id id_table[] = {
33 { USB_DEVICE(0x065a, 0x0009) },
34 { },
35};
36MODULE_DEVICE_TABLE(usb, id_table);
37
38/* This structure holds all of the individual device information */
39struct opticon_private {
40 spinlock_t lock; /* protects the following flags */
41 bool rts;
42 bool cts;
43 int outstanding_urbs;
44 int outstanding_bytes;
45
46 struct usb_anchor anchor;
47};
48
49
50static void opticon_process_data_packet(struct usb_serial_port *port,
51 const unsigned char *buf, size_t len)
52{
53 tty_insert_flip_string(&port->port, buf, len);
54 tty_flip_buffer_push(&port->port);
55}
56
57static void opticon_process_status_packet(struct usb_serial_port *port,
58 const unsigned char *buf, size_t len)
59{
60 struct opticon_private *priv = usb_get_serial_port_data(port);
61 unsigned long flags;
62
63 spin_lock_irqsave(&priv->lock, flags);
64 if (buf[0] == 0x00)
65 priv->cts = false;
66 else
67 priv->cts = true;
68 spin_unlock_irqrestore(&priv->lock, flags);
69}
70
71static void opticon_process_read_urb(struct urb *urb)
72{
73 struct usb_serial_port *port = urb->context;
74 const unsigned char *hdr = urb->transfer_buffer;
75 const unsigned char *data = hdr + 2;
76 size_t data_len = urb->actual_length - 2;
77
78 if (urb->actual_length <= 2) {
79 dev_dbg(&port->dev, "malformed packet received: %d bytes\n",
80 urb->actual_length);
81 return;
82 }
83 /*
84 * Data from the device comes with a 2 byte header:
85 *
86 * <0x00><0x00>data...
87 * This is real data to be sent to the tty layer
88 * <0x00><0x01>level
89 * This is a CTS level change, the third byte is the CTS
90 * value (0 for low, 1 for high).
91 */
92 if ((hdr[0] == 0x00) && (hdr[1] == 0x00)) {
93 opticon_process_data_packet(port, data, data_len);
94 } else if ((hdr[0] == 0x00) && (hdr[1] == 0x01)) {
95 opticon_process_status_packet(port, data, data_len);
96 } else {
97 dev_dbg(&port->dev, "unknown packet received: %02x %02x\n",
98 hdr[0], hdr[1]);
99 }
100}
101
102static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
103 u8 val)
104{
105 struct usb_serial *serial = port->serial;
106 int retval;
107 u8 *buffer;
108
109 buffer = kzalloc(1, GFP_KERNEL);
110 if (!buffer)
111 return -ENOMEM;
112
113 buffer[0] = val;
114 /* Send the message to the vendor control endpoint
115 * of the connected device */
116 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
117 requesttype,
118 USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
119 0, 0, buffer, 1, USB_CTRL_SET_TIMEOUT);
120 kfree(buffer);
121
122 if (retval < 0)
123 return retval;
124
125 return 0;
126}
127
128static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
129{
130 struct opticon_private *priv = usb_get_serial_port_data(port);
131 unsigned long flags;
132 int res;
133
134 spin_lock_irqsave(&priv->lock, flags);
135 priv->rts = false;
136 spin_unlock_irqrestore(&priv->lock, flags);
137
138 /* Clear RTS line */
139 send_control_msg(port, CONTROL_RTS, 0);
140
141 /* clear the halt status of the endpoint */
142 usb_clear_halt(port->serial->dev, port->read_urb->pipe);
143
144 res = usb_serial_generic_open(tty, port);
145 if (res)
146 return res;
147
148 /* Request CTS line state, sometimes during opening the current
149 * CTS state can be missed. */
150 send_control_msg(port, RESEND_CTS_STATE, 1);
151
152 return res;
153}
154
155static void opticon_close(struct usb_serial_port *port)
156{
157 struct opticon_private *priv = usb_get_serial_port_data(port);
158
159 usb_kill_anchored_urbs(&priv->anchor);
160
161 usb_serial_generic_close(port);
162}
163
164static void opticon_write_control_callback(struct urb *urb)
165{
166 struct usb_serial_port *port = urb->context;
167 struct opticon_private *priv = usb_get_serial_port_data(port);
168 int status = urb->status;
169 unsigned long flags;
170
171 /* free up the transfer buffer, as usb_free_urb() does not do this */
172 kfree(urb->transfer_buffer);
173
174 /* setup packet may be set if we're using it for writing */
175 kfree(urb->setup_packet);
176
177 if (status)
178 dev_dbg(&port->dev,
179 "%s - non-zero urb status received: %d\n",
180 __func__, status);
181
182 spin_lock_irqsave(&priv->lock, flags);
183 --priv->outstanding_urbs;
184 priv->outstanding_bytes -= urb->transfer_buffer_length;
185 spin_unlock_irqrestore(&priv->lock, flags);
186
187 usb_serial_port_softint(port);
188}
189
190static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
191 const unsigned char *buf, int count)
192{
193 struct opticon_private *priv = usb_get_serial_port_data(port);
194 struct usb_serial *serial = port->serial;
195 struct urb *urb;
196 unsigned char *buffer;
197 unsigned long flags;
198 struct usb_ctrlrequest *dr;
199 int ret = -ENOMEM;
200
201 spin_lock_irqsave(&priv->lock, flags);
202 if (priv->outstanding_urbs > URB_UPPER_LIMIT) {
203 spin_unlock_irqrestore(&priv->lock, flags);
204 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
205 return 0;
206 }
207 priv->outstanding_urbs++;
208 priv->outstanding_bytes += count;
209 spin_unlock_irqrestore(&priv->lock, flags);
210
211 buffer = kmemdup(buf, count, GFP_ATOMIC);
212 if (!buffer)
213 goto error_no_buffer;
214
215 urb = usb_alloc_urb(0, GFP_ATOMIC);
216 if (!urb)
217 goto error_no_urb;
218
219 usb_serial_debug_data(&port->dev, __func__, count, buffer);
220
221 /* The connected devices do not have a bulk write endpoint,
222 * to transmit data to de barcode device the control endpoint is used */
223 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
224 if (!dr)
225 goto error_no_dr;
226
227 dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
228 dr->bRequest = 0x01;
229 dr->wValue = 0;
230 dr->wIndex = 0;
231 dr->wLength = cpu_to_le16(count);
232
233 usb_fill_control_urb(urb, serial->dev,
234 usb_sndctrlpipe(serial->dev, 0),
235 (unsigned char *)dr, buffer, count,
236 opticon_write_control_callback, port);
237
238 usb_anchor_urb(urb, &priv->anchor);
239
240 /* send it down the pipe */
241 ret = usb_submit_urb(urb, GFP_ATOMIC);
242 if (ret) {
243 dev_err(&port->dev, "failed to submit write urb: %d\n", ret);
244 usb_unanchor_urb(urb);
245 goto error;
246 }
247
248 /* we are done with this urb, so let the host driver
249 * really free it when it is finished with it */
250 usb_free_urb(urb);
251
252 return count;
253error:
254 kfree(dr);
255error_no_dr:
256 usb_free_urb(urb);
257error_no_urb:
258 kfree(buffer);
259error_no_buffer:
260 spin_lock_irqsave(&priv->lock, flags);
261 --priv->outstanding_urbs;
262 priv->outstanding_bytes -= count;
263 spin_unlock_irqrestore(&priv->lock, flags);
264
265 return ret;
266}
267
268static unsigned int opticon_write_room(struct tty_struct *tty)
269{
270 struct usb_serial_port *port = tty->driver_data;
271 struct opticon_private *priv = usb_get_serial_port_data(port);
272 unsigned long flags;
273
274 /*
275 * We really can take almost anything the user throws at us
276 * but let's pick a nice big number to tell the tty
277 * layer that we have lots of free space, unless we don't.
278 */
279 spin_lock_irqsave(&priv->lock, flags);
280 if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) {
281 spin_unlock_irqrestore(&priv->lock, flags);
282 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
283 return 0;
284 }
285 spin_unlock_irqrestore(&priv->lock, flags);
286
287 return 2048;
288}
289
290static unsigned int opticon_chars_in_buffer(struct tty_struct *tty)
291{
292 struct usb_serial_port *port = tty->driver_data;
293 struct opticon_private *priv = usb_get_serial_port_data(port);
294 unsigned long flags;
295 unsigned int count;
296
297 spin_lock_irqsave(&priv->lock, flags);
298 count = priv->outstanding_bytes;
299 spin_unlock_irqrestore(&priv->lock, flags);
300
301 return count;
302}
303
304static int opticon_tiocmget(struct tty_struct *tty)
305{
306 struct usb_serial_port *port = tty->driver_data;
307 struct opticon_private *priv = usb_get_serial_port_data(port);
308 unsigned long flags;
309 int result = 0;
310
311 spin_lock_irqsave(&priv->lock, flags);
312 if (priv->rts)
313 result |= TIOCM_RTS;
314 if (priv->cts)
315 result |= TIOCM_CTS;
316 spin_unlock_irqrestore(&priv->lock, flags);
317
318 dev_dbg(&port->dev, "%s - %x\n", __func__, result);
319 return result;
320}
321
322static int opticon_tiocmset(struct tty_struct *tty,
323 unsigned int set, unsigned int clear)
324{
325 struct usb_serial_port *port = tty->driver_data;
326 struct opticon_private *priv = usb_get_serial_port_data(port);
327 unsigned long flags;
328 bool rts;
329 bool changed = false;
330 int ret;
331
332 /* We only support RTS so we only handle that */
333 spin_lock_irqsave(&priv->lock, flags);
334
335 rts = priv->rts;
336 if (set & TIOCM_RTS)
337 priv->rts = true;
338 if (clear & TIOCM_RTS)
339 priv->rts = false;
340 changed = rts ^ priv->rts;
341 spin_unlock_irqrestore(&priv->lock, flags);
342
343 if (!changed)
344 return 0;
345
346 ret = send_control_msg(port, CONTROL_RTS, !rts);
347 if (ret)
348 return usb_translate_errors(ret);
349
350 return 0;
351}
352
353static int opticon_port_probe(struct usb_serial_port *port)
354{
355 struct opticon_private *priv;
356
357 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
358 if (!priv)
359 return -ENOMEM;
360
361 spin_lock_init(&priv->lock);
362 init_usb_anchor(&priv->anchor);
363
364 usb_set_serial_port_data(port, priv);
365
366 return 0;
367}
368
369static void opticon_port_remove(struct usb_serial_port *port)
370{
371 struct opticon_private *priv = usb_get_serial_port_data(port);
372
373 kfree(priv);
374}
375
376static struct usb_serial_driver opticon_device = {
377 .driver = {
378 .owner = THIS_MODULE,
379 .name = "opticon",
380 },
381 .id_table = id_table,
382 .num_ports = 1,
383 .num_bulk_in = 1,
384 .bulk_in_size = 256,
385 .port_probe = opticon_port_probe,
386 .port_remove = opticon_port_remove,
387 .open = opticon_open,
388 .close = opticon_close,
389 .write = opticon_write,
390 .write_room = opticon_write_room,
391 .chars_in_buffer = opticon_chars_in_buffer,
392 .throttle = usb_serial_generic_throttle,
393 .unthrottle = usb_serial_generic_unthrottle,
394 .tiocmget = opticon_tiocmget,
395 .tiocmset = opticon_tiocmset,
396 .process_read_urb = opticon_process_read_urb,
397};
398
399static struct usb_serial_driver * const serial_drivers[] = {
400 &opticon_device, NULL
401};
402
403module_usb_serial_driver(serial_drivers, id_table);
404
405MODULE_DESCRIPTION(DRIVER_DESC);
406MODULE_LICENSE("GPL v2");
1/*
2 * Opticon USB barcode to serial driver
3 *
4 * Copyright (C) 2011 - 2012 Johan Hovold <jhovold@gmail.com>
5 * Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com>
6 * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
7 * Copyright (C) 2008 - 2009 Novell Inc.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
12 */
13
14#include <linux/kernel.h>
15#include <linux/tty.h>
16#include <linux/tty_driver.h>
17#include <linux/slab.h>
18#include <linux/tty_flip.h>
19#include <linux/serial.h>
20#include <linux/module.h>
21#include <linux/usb.h>
22#include <linux/usb/serial.h>
23#include <linux/uaccess.h>
24
25#define CONTROL_RTS 0x02
26#define RESEND_CTS_STATE 0x03
27
28/* max number of write urbs in flight */
29#define URB_UPPER_LIMIT 8
30
31/* This driver works for the Opticon 1D barcode reader
32 * an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */
33#define DRIVER_DESC "Opticon USB barcode to serial driver (1D)"
34
35static const struct usb_device_id id_table[] = {
36 { USB_DEVICE(0x065a, 0x0009) },
37 { },
38};
39MODULE_DEVICE_TABLE(usb, id_table);
40
41/* This structure holds all of the individual device information */
42struct opticon_private {
43 spinlock_t lock; /* protects the following flags */
44 bool rts;
45 bool cts;
46 int outstanding_urbs;
47};
48
49
50static void opticon_process_data_packet(struct usb_serial_port *port,
51 const unsigned char *buf, size_t len)
52{
53 tty_insert_flip_string(&port->port, buf, len);
54 tty_flip_buffer_push(&port->port);
55}
56
57static void opticon_process_status_packet(struct usb_serial_port *port,
58 const unsigned char *buf, size_t len)
59{
60 struct opticon_private *priv = usb_get_serial_port_data(port);
61 unsigned long flags;
62
63 spin_lock_irqsave(&priv->lock, flags);
64 if (buf[0] == 0x00)
65 priv->cts = false;
66 else
67 priv->cts = true;
68 spin_unlock_irqrestore(&priv->lock, flags);
69}
70
71static void opticon_process_read_urb(struct urb *urb)
72{
73 struct usb_serial_port *port = urb->context;
74 const unsigned char *hdr = urb->transfer_buffer;
75 const unsigned char *data = hdr + 2;
76 size_t data_len = urb->actual_length - 2;
77
78 if (urb->actual_length <= 2) {
79 dev_dbg(&port->dev, "malformed packet received: %d bytes\n",
80 urb->actual_length);
81 return;
82 }
83 /*
84 * Data from the device comes with a 2 byte header:
85 *
86 * <0x00><0x00>data...
87 * This is real data to be sent to the tty layer
88 * <0x00><0x01>level
89 * This is a CTS level change, the third byte is the CTS
90 * value (0 for low, 1 for high).
91 */
92 if ((hdr[0] == 0x00) && (hdr[1] == 0x00)) {
93 opticon_process_data_packet(port, data, data_len);
94 } else if ((hdr[0] == 0x00) && (hdr[1] == 0x01)) {
95 opticon_process_status_packet(port, data, data_len);
96 } else {
97 dev_dbg(&port->dev, "unknown packet received: %02x %02x\n",
98 hdr[0], hdr[1]);
99 }
100}
101
102static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
103 u8 val)
104{
105 struct usb_serial *serial = port->serial;
106 int retval;
107 u8 *buffer;
108
109 buffer = kzalloc(1, GFP_KERNEL);
110 if (!buffer)
111 return -ENOMEM;
112
113 buffer[0] = val;
114 /* Send the message to the vendor control endpoint
115 * of the connected device */
116 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
117 requesttype,
118 USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
119 0, 0, buffer, 1, 0);
120 kfree(buffer);
121
122 if (retval < 0)
123 return retval;
124
125 return 0;
126}
127
128static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
129{
130 struct opticon_private *priv = usb_get_serial_port_data(port);
131 unsigned long flags;
132 int res;
133
134 spin_lock_irqsave(&priv->lock, flags);
135 priv->rts = false;
136 spin_unlock_irqrestore(&priv->lock, flags);
137
138 /* Clear RTS line */
139 send_control_msg(port, CONTROL_RTS, 0);
140
141 /* clear the halt status of the endpoint */
142 usb_clear_halt(port->serial->dev, port->read_urb->pipe);
143
144 res = usb_serial_generic_open(tty, port);
145 if (!res)
146 return res;
147
148 /* Request CTS line state, sometimes during opening the current
149 * CTS state can be missed. */
150 send_control_msg(port, RESEND_CTS_STATE, 1);
151
152 return res;
153}
154
155static void opticon_write_control_callback(struct urb *urb)
156{
157 struct usb_serial_port *port = urb->context;
158 struct opticon_private *priv = usb_get_serial_port_data(port);
159 int status = urb->status;
160 unsigned long flags;
161
162 /* free up the transfer buffer, as usb_free_urb() does not do this */
163 kfree(urb->transfer_buffer);
164
165 /* setup packet may be set if we're using it for writing */
166 kfree(urb->setup_packet);
167
168 if (status)
169 dev_dbg(&port->dev,
170 "%s - non-zero urb status received: %d\n",
171 __func__, status);
172
173 spin_lock_irqsave(&priv->lock, flags);
174 --priv->outstanding_urbs;
175 spin_unlock_irqrestore(&priv->lock, flags);
176
177 usb_serial_port_softint(port);
178}
179
180static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
181 const unsigned char *buf, int count)
182{
183 struct opticon_private *priv = usb_get_serial_port_data(port);
184 struct usb_serial *serial = port->serial;
185 struct urb *urb;
186 unsigned char *buffer;
187 unsigned long flags;
188 int status;
189 struct usb_ctrlrequest *dr;
190
191 spin_lock_irqsave(&priv->lock, flags);
192 if (priv->outstanding_urbs > URB_UPPER_LIMIT) {
193 spin_unlock_irqrestore(&priv->lock, flags);
194 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
195 return 0;
196 }
197 priv->outstanding_urbs++;
198 spin_unlock_irqrestore(&priv->lock, flags);
199
200 buffer = kmalloc(count, GFP_ATOMIC);
201 if (!buffer) {
202 count = -ENOMEM;
203 goto error_no_buffer;
204 }
205
206 urb = usb_alloc_urb(0, GFP_ATOMIC);
207 if (!urb) {
208 count = -ENOMEM;
209 goto error_no_urb;
210 }
211
212 memcpy(buffer, buf, count);
213
214 usb_serial_debug_data(&port->dev, __func__, count, buffer);
215
216 /* The connected devices do not have a bulk write endpoint,
217 * to transmit data to de barcode device the control endpoint is used */
218 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
219 if (!dr) {
220 count = -ENOMEM;
221 goto error_no_dr;
222 }
223
224 dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
225 dr->bRequest = 0x01;
226 dr->wValue = 0;
227 dr->wIndex = 0;
228 dr->wLength = cpu_to_le16(count);
229
230 usb_fill_control_urb(urb, serial->dev,
231 usb_sndctrlpipe(serial->dev, 0),
232 (unsigned char *)dr, buffer, count,
233 opticon_write_control_callback, port);
234
235 /* send it down the pipe */
236 status = usb_submit_urb(urb, GFP_ATOMIC);
237 if (status) {
238 dev_err(&port->dev,
239 "%s - usb_submit_urb(write endpoint) failed status = %d\n",
240 __func__, status);
241 count = status;
242 goto error;
243 }
244
245 /* we are done with this urb, so let the host driver
246 * really free it when it is finished with it */
247 usb_free_urb(urb);
248
249 return count;
250error:
251 kfree(dr);
252error_no_dr:
253 usb_free_urb(urb);
254error_no_urb:
255 kfree(buffer);
256error_no_buffer:
257 spin_lock_irqsave(&priv->lock, flags);
258 --priv->outstanding_urbs;
259 spin_unlock_irqrestore(&priv->lock, flags);
260 return count;
261}
262
263static int opticon_write_room(struct tty_struct *tty)
264{
265 struct usb_serial_port *port = tty->driver_data;
266 struct opticon_private *priv = usb_get_serial_port_data(port);
267 unsigned long flags;
268
269 /*
270 * We really can take almost anything the user throws at us
271 * but let's pick a nice big number to tell the tty
272 * layer that we have lots of free space, unless we don't.
273 */
274 spin_lock_irqsave(&priv->lock, flags);
275 if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) {
276 spin_unlock_irqrestore(&priv->lock, flags);
277 dev_dbg(&port->dev, "%s - write limit hit\n", __func__);
278 return 0;
279 }
280 spin_unlock_irqrestore(&priv->lock, flags);
281
282 return 2048;
283}
284
285static int opticon_tiocmget(struct tty_struct *tty)
286{
287 struct usb_serial_port *port = tty->driver_data;
288 struct opticon_private *priv = usb_get_serial_port_data(port);
289 unsigned long flags;
290 int result = 0;
291
292 spin_lock_irqsave(&priv->lock, flags);
293 if (priv->rts)
294 result |= TIOCM_RTS;
295 if (priv->cts)
296 result |= TIOCM_CTS;
297 spin_unlock_irqrestore(&priv->lock, flags);
298
299 dev_dbg(&port->dev, "%s - %x\n", __func__, result);
300 return result;
301}
302
303static int opticon_tiocmset(struct tty_struct *tty,
304 unsigned int set, unsigned int clear)
305{
306 struct usb_serial_port *port = tty->driver_data;
307 struct opticon_private *priv = usb_get_serial_port_data(port);
308 unsigned long flags;
309 bool rts;
310 bool changed = false;
311 int ret;
312
313 /* We only support RTS so we only handle that */
314 spin_lock_irqsave(&priv->lock, flags);
315
316 rts = priv->rts;
317 if (set & TIOCM_RTS)
318 priv->rts = true;
319 if (clear & TIOCM_RTS)
320 priv->rts = false;
321 changed = rts ^ priv->rts;
322 spin_unlock_irqrestore(&priv->lock, flags);
323
324 if (!changed)
325 return 0;
326
327 ret = send_control_msg(port, CONTROL_RTS, !rts);
328 if (ret)
329 return usb_translate_errors(ret);
330
331 return 0;
332}
333
334static int get_serial_info(struct usb_serial_port *port,
335 struct serial_struct __user *serial)
336{
337 struct serial_struct tmp;
338
339 if (!serial)
340 return -EFAULT;
341
342 memset(&tmp, 0x00, sizeof(tmp));
343
344 /* fake emulate a 16550 uart to make userspace code happy */
345 tmp.type = PORT_16550A;
346 tmp.line = port->minor;
347 tmp.port = 0;
348 tmp.irq = 0;
349 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
350 tmp.xmit_fifo_size = 1024;
351 tmp.baud_base = 9600;
352 tmp.close_delay = 5*HZ;
353 tmp.closing_wait = 30*HZ;
354
355 if (copy_to_user(serial, &tmp, sizeof(*serial)))
356 return -EFAULT;
357 return 0;
358}
359
360static int opticon_ioctl(struct tty_struct *tty,
361 unsigned int cmd, unsigned long arg)
362{
363 struct usb_serial_port *port = tty->driver_data;
364
365 switch (cmd) {
366 case TIOCGSERIAL:
367 return get_serial_info(port,
368 (struct serial_struct __user *)arg);
369 }
370
371 return -ENOIOCTLCMD;
372}
373
374static int opticon_startup(struct usb_serial *serial)
375{
376 if (!serial->num_bulk_in) {
377 dev_err(&serial->dev->dev, "no bulk in endpoint\n");
378 return -ENODEV;
379 }
380
381 return 0;
382}
383
384static int opticon_port_probe(struct usb_serial_port *port)
385{
386 struct opticon_private *priv;
387
388 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
389 if (!priv)
390 return -ENOMEM;
391
392 spin_lock_init(&priv->lock);
393
394 usb_set_serial_port_data(port, priv);
395
396 return 0;
397}
398
399static int opticon_port_remove(struct usb_serial_port *port)
400{
401 struct opticon_private *priv = usb_get_serial_port_data(port);
402
403 kfree(priv);
404
405 return 0;
406}
407
408static struct usb_serial_driver opticon_device = {
409 .driver = {
410 .owner = THIS_MODULE,
411 .name = "opticon",
412 },
413 .id_table = id_table,
414 .num_ports = 1,
415 .bulk_in_size = 256,
416 .attach = opticon_startup,
417 .port_probe = opticon_port_probe,
418 .port_remove = opticon_port_remove,
419 .open = opticon_open,
420 .write = opticon_write,
421 .write_room = opticon_write_room,
422 .throttle = usb_serial_generic_throttle,
423 .unthrottle = usb_serial_generic_unthrottle,
424 .ioctl = opticon_ioctl,
425 .tiocmget = opticon_tiocmget,
426 .tiocmset = opticon_tiocmset,
427 .process_read_urb = opticon_process_read_urb,
428};
429
430static struct usb_serial_driver * const serial_drivers[] = {
431 &opticon_device, NULL
432};
433
434module_usb_serial_driver(serial_drivers, id_table);
435
436MODULE_DESCRIPTION(DRIVER_DESC);
437MODULE_LICENSE("GPL");