Commit | Line | Data |
---|---|---|
43d186fe | 1 | /* |
d4cbd6e9 GKH |
2 | Some of this code is credited to Linux USB open source files that are |
3 | distributed with Linux. | |
43d186fe AB |
4 | |
5 | Copyright: 2007 Metrologic Instruments. All rights reserved. | |
6 | Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/> | |
43d186fe AB |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/tty.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/usb.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/tty_driver.h> | |
17 | #include <linux/tty_flip.h> | |
18 | #include <linux/moduleparam.h> | |
19 | #include <linux/spinlock.h> | |
43d186fe | 20 | #include <linux/errno.h> |
d4cbd6e9 | 21 | #include <linux/uaccess.h> |
43d186fe AB |
22 | #include <linux/usb/serial.h> |
23 | ||
24 | /* Version Information */ | |
25 | #define DRIVER_VERSION "v1.2.0.0" | |
26 | #define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver" | |
27 | ||
159d4d8d GKH |
28 | /* Product information. */ |
29 | #define FOCUS_VENDOR_ID 0x0C2E | |
30 | #define FOCUS_PRODUCT_ID 0x0720 | |
31 | #define FOCUS_PRODUCT_ID_UNI 0x0710 | |
32 | ||
33 | #define METROUSB_SET_REQUEST_TYPE 0x40 | |
34 | #define METROUSB_SET_MODEM_CTRL_REQUEST 10 | |
35 | #define METROUSB_SET_BREAK_REQUEST 0x40 | |
36 | #define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */ | |
37 | #define METROUSB_MCR_RTS 0x0a /* Activate RTS. */ | |
38 | #define METROUSB_MCR_DTR 0x09 /* Activate DTR. */ | |
d4cbd6e9 | 39 | #define WDR_TIMEOUT 5000 /* default urb timeout. */ |
159d4d8d GKH |
40 | |
41 | /* Private data structure. */ | |
42 | struct metrousb_private { | |
43 | spinlock_t lock; | |
44 | int throttled; | |
45 | unsigned long control_state; | |
46 | }; | |
47 | ||
43d186fe | 48 | /* Device table list. */ |
d4cbd6e9 | 49 | static struct usb_device_id id_table[] = { |
43d186fe AB |
50 | { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID) }, |
51 | { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) }, | |
43d186fe AB |
52 | { }, /* Terminating entry. */ |
53 | }; | |
54 | MODULE_DEVICE_TABLE(usb, id_table); | |
55 | ||
56 | /* Input parameter constants. */ | |
fdac0f64 | 57 | static bool debug; |
43d186fe | 58 | |
9fbd1649 | 59 | static void metrousb_read_int_callback(struct urb *urb) |
43d186fe | 60 | { |
8111e4ec | 61 | struct usb_serial_port *port = urb->context; |
9fbd1649 GKH |
62 | struct metrousb_private *metro_priv = usb_get_serial_port_data(port); |
63 | struct tty_struct *tty; | |
64 | unsigned char *data = urb->transfer_buffer; | |
65 | int throttled = 0; | |
66 | int result = 0; | |
67 | unsigned long flags = 0; | |
68 | ||
43d186fe AB |
69 | dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); |
70 | ||
9fbd1649 GKH |
71 | switch (urb->status) { |
72 | case 0: | |
73 | /* Success status, read from the port. */ | |
74 | break; | |
75 | case -ECONNRESET: | |
76 | case -ENOENT: | |
77 | case -ESHUTDOWN: | |
78 | /* urb has been terminated. */ | |
79 | dbg("METRO-USB - %s - urb shutting down, port number=%d, error code=%d", | |
80 | __FUNCTION__, port->number, result); | |
81 | return; | |
82 | default: | |
83 | dbg("METRO-USB - %s - non-zero urb received, port number=%d, error code=%d", | |
84 | __FUNCTION__, port->number, result); | |
85 | goto exit; | |
86 | } | |
87 | ||
88 | ||
89 | /* Set the data read from the usb port into the serial port buffer. */ | |
90 | tty = tty_port_tty_get(&port->port); | |
91 | if (!tty) { | |
92 | dbg("%s - bad tty pointer - exiting", __func__); | |
93 | return; | |
94 | } | |
95 | ||
96 | if (tty && urb->actual_length) { | |
97 | /* Loop through the data copying each byte to the tty layer. */ | |
98 | tty_insert_flip_string(tty, data, urb->actual_length); | |
99 | ||
100 | /* Force the data to the tty layer. */ | |
101 | tty_flip_buffer_push(tty); | |
102 | } | |
103 | tty_kref_put(tty); | |
104 | ||
105 | /* Set any port variables. */ | |
106 | spin_lock_irqsave(&metro_priv->lock, flags); | |
107 | throttled = metro_priv->throttled; | |
108 | spin_unlock_irqrestore(&metro_priv->lock, flags); | |
109 | ||
110 | /* Continue trying to read if set. */ | |
111 | if (!throttled) { | |
112 | usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev, | |
113 | usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress), | |
114 | port->interrupt_in_urb->transfer_buffer, | |
115 | port->interrupt_in_urb->transfer_buffer_length, | |
116 | metrousb_read_int_callback, port, 1); | |
117 | ||
118 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
119 | ||
120 | if (result) { | |
121 | dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d", | |
122 | __FUNCTION__, port->number, result); | |
43d186fe | 123 | } |
43d186fe | 124 | } |
9fbd1649 GKH |
125 | return; |
126 | ||
127 | exit: | |
128 | /* Try to resubmit the urb. */ | |
129 | result = usb_submit_urb(urb, GFP_ATOMIC); | |
130 | if (result) { | |
131 | dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d", | |
132 | __FUNCTION__, port->number, result); | |
133 | } | |
43d186fe AB |
134 | } |
135 | ||
9fbd1649 | 136 | static void metrousb_cleanup(struct usb_serial_port *port) |
43d186fe AB |
137 | { |
138 | dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); | |
9fbd1649 GKH |
139 | |
140 | if (port->serial->dev) { | |
141 | /* Shutdown any interrupt in urbs. */ | |
142 | if (port->interrupt_in_urb) { | |
143 | usb_unlink_urb(port->interrupt_in_urb); | |
144 | usb_kill_urb(port->interrupt_in_urb); | |
145 | } | |
146 | } | |
43d186fe AB |
147 | } |
148 | ||
d4cbd6e9 | 149 | static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port) |
43d186fe AB |
150 | { |
151 | struct usb_serial *serial = port->serial; | |
152 | struct metrousb_private *metro_priv = usb_get_serial_port_data(port); | |
153 | unsigned long flags = 0; | |
154 | int result = 0; | |
155 | ||
156 | dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); | |
157 | ||
158 | /* Make sure the urb is initialized. */ | |
159 | if (!port->interrupt_in_urb) { | |
160 | dbg("METRO-USB - %s - interrupt urb not initialized for port number=%d", __FUNCTION__, port->number); | |
161 | return -ENODEV; | |
162 | } | |
163 | ||
164 | /* Set the private data information for the port. */ | |
165 | spin_lock_irqsave(&metro_priv->lock, flags); | |
166 | metro_priv->control_state = 0; | |
167 | metro_priv->throttled = 0; | |
168 | spin_unlock_irqrestore(&metro_priv->lock, flags); | |
169 | ||
170 | /* | |
171 | * Force low_latency on so that our tty_push actually forces the data | |
172 | * through, otherwise it is scheduled, and with high data rates (like | |
173 | * with OHCI) data can get lost. | |
174 | */ | |
d4cbd6e9 | 175 | if (tty) |
43d186fe | 176 | tty->low_latency = 1; |
43d186fe AB |
177 | |
178 | /* Clear the urb pipe. */ | |
179 | usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe); | |
180 | ||
181 | /* Start reading from the device */ | |
d4cbd6e9 GKH |
182 | usb_fill_int_urb(port->interrupt_in_urb, serial->dev, |
183 | usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress), | |
43d186fe AB |
184 | port->interrupt_in_urb->transfer_buffer, |
185 | port->interrupt_in_urb->transfer_buffer_length, | |
186 | metrousb_read_int_callback, port, 1); | |
187 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); | |
188 | ||
189 | if (result) { | |
190 | dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d" | |
191 | , __FUNCTION__, port->number, result); | |
192 | goto exit; | |
193 | } | |
194 | ||
195 | dbg("METRO-USB - %s - port open for port number=%d", __FUNCTION__, port->number); | |
196 | exit: | |
197 | return result; | |
198 | } | |
199 | ||
43d186fe AB |
200 | static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state) |
201 | { | |
202 | int retval = 0; | |
203 | unsigned char mcr = METROUSB_MCR_NONE; | |
204 | ||
205 | dbg("METRO-USB - %s - control state=%d", __FUNCTION__, control_state); | |
206 | ||
207 | /* Set the modem control value. */ | |
208 | if (control_state & TIOCM_DTR) | |
209 | mcr |= METROUSB_MCR_DTR; | |
210 | if (control_state & TIOCM_RTS) | |
211 | mcr |= METROUSB_MCR_RTS; | |
212 | ||
213 | /* Send the command to the usb port. */ | |
214 | retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), | |
215 | METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST, | |
216 | control_state, 0, NULL, 0, WDR_TIMEOUT); | |
217 | if (retval < 0) | |
218 | dbg("METRO-USB - %s - set modem ctrl=0x%x failed, error code=%d", __FUNCTION__, mcr, retval); | |
219 | ||
220 | return retval; | |
221 | } | |
222 | ||
d4cbd6e9 | 223 | static void metrousb_shutdown(struct usb_serial *serial) |
43d186fe AB |
224 | { |
225 | int i = 0; | |
226 | ||
227 | dbg("METRO-USB - %s", __FUNCTION__); | |
228 | ||
229 | /* Stop reading and writing on all ports. */ | |
d4cbd6e9 | 230 | for (i = 0; i < serial->num_ports; ++i) { |
43d186fe AB |
231 | /* Close any open urbs. */ |
232 | metrousb_cleanup(serial->port[i]); | |
233 | ||
234 | /* Free memory. */ | |
235 | kfree(usb_get_serial_port_data(serial->port[i])); | |
236 | usb_set_serial_port_data(serial->port[i], NULL); | |
237 | ||
238 | dbg("METRO-USB - %s - freed port number=%d", __FUNCTION__, serial->port[i]->number); | |
239 | } | |
240 | } | |
241 | ||
43d186fe AB |
242 | static int metrousb_startup(struct usb_serial *serial) |
243 | { | |
244 | struct metrousb_private *metro_priv; | |
245 | struct usb_serial_port *port; | |
246 | int i = 0; | |
247 | ||
248 | dbg("METRO-USB - %s", __FUNCTION__); | |
249 | ||
250 | /* Loop through the serial ports setting up the private structures. | |
251 | * Currently we only use one port. */ | |
252 | for (i = 0; i < serial->num_ports; ++i) { | |
253 | port = serial->port[i]; | |
254 | ||
255 | /* Declare memory. */ | |
8111e4ec | 256 | metro_priv = kzalloc(sizeof(struct metrousb_private), GFP_KERNEL); |
43d186fe AB |
257 | if (!metro_priv) |
258 | return -ENOMEM; | |
259 | ||
43d186fe AB |
260 | /* Initialize memory. */ |
261 | spin_lock_init(&metro_priv->lock); | |
262 | usb_set_serial_port_data(port, metro_priv); | |
263 | ||
264 | dbg("METRO-USB - %s - port number=%d.", __FUNCTION__, port->number); | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
d4cbd6e9 | 270 | static void metrousb_throttle(struct tty_struct *tty) |
43d186fe AB |
271 | { |
272 | struct usb_serial_port *port = tty->driver_data; | |
273 | struct metrousb_private *metro_priv = usb_get_serial_port_data(port); | |
274 | unsigned long flags = 0; | |
275 | ||
276 | dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); | |
277 | ||
278 | /* Set the private information for the port to stop reading data. */ | |
279 | spin_lock_irqsave(&metro_priv->lock, flags); | |
280 | metro_priv->throttled = 1; | |
281 | spin_unlock_irqrestore(&metro_priv->lock, flags); | |
282 | } | |
283 | ||
d4cbd6e9 | 284 | static int metrousb_tiocmget(struct tty_struct *tty) |
43d186fe AB |
285 | { |
286 | unsigned long control_state = 0; | |
287 | struct usb_serial_port *port = tty->driver_data; | |
288 | struct metrousb_private *metro_priv = usb_get_serial_port_data(port); | |
289 | unsigned long flags = 0; | |
290 | ||
291 | dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); | |
292 | ||
293 | spin_lock_irqsave(&metro_priv->lock, flags); | |
294 | control_state = metro_priv->control_state; | |
295 | spin_unlock_irqrestore(&metro_priv->lock, flags); | |
296 | ||
297 | return control_state; | |
298 | } | |
299 | ||
d4cbd6e9 GKH |
300 | static int metrousb_tiocmset(struct tty_struct *tty, |
301 | unsigned int set, unsigned int clear) | |
43d186fe AB |
302 | { |
303 | struct usb_serial_port *port = tty->driver_data; | |
304 | struct usb_serial *serial = port->serial; | |
305 | struct metrousb_private *metro_priv = usb_get_serial_port_data(port); | |
306 | unsigned long flags = 0; | |
307 | unsigned long control_state = 0; | |
308 | ||
309 | dbg("METRO-USB - %s - port number=%d, set=%d, clear=%d", __FUNCTION__, port->number, set, clear); | |
310 | ||
311 | spin_lock_irqsave(&metro_priv->lock, flags); | |
312 | control_state = metro_priv->control_state; | |
313 | ||
d4cbd6e9 | 314 | /* Set the RTS and DTR values. */ |
43d186fe AB |
315 | if (set & TIOCM_RTS) |
316 | control_state |= TIOCM_RTS; | |
317 | if (set & TIOCM_DTR) | |
318 | control_state |= TIOCM_DTR; | |
319 | if (clear & TIOCM_RTS) | |
320 | control_state &= ~TIOCM_RTS; | |
321 | if (clear & TIOCM_DTR) | |
322 | control_state &= ~TIOCM_DTR; | |
323 | ||
324 | metro_priv->control_state = control_state; | |
325 | spin_unlock_irqrestore(&metro_priv->lock, flags); | |
326 | return metrousb_set_modem_ctrl(serial, control_state); | |
327 | } | |
328 | ||
d4cbd6e9 | 329 | static void metrousb_unthrottle(struct tty_struct *tty) |
43d186fe AB |
330 | { |
331 | struct usb_serial_port *port = tty->driver_data; | |
332 | struct metrousb_private *metro_priv = usb_get_serial_port_data(port); | |
333 | unsigned long flags = 0; | |
334 | int result = 0; | |
335 | ||
336 | dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); | |
337 | ||
338 | /* Set the private information for the port to resume reading data. */ | |
339 | spin_lock_irqsave(&metro_priv->lock, flags); | |
340 | metro_priv->throttled = 0; | |
341 | spin_unlock_irqrestore(&metro_priv->lock, flags); | |
342 | ||
343 | /* Submit the urb to read from the port. */ | |
344 | port->interrupt_in_urb->dev = port->serial->dev; | |
345 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); | |
346 | if (result) { | |
347 | dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d", | |
348 | __FUNCTION__, port->number, result); | |
349 | } | |
350 | } | |
351 | ||
9fbd1649 GKH |
352 | static struct usb_driver metrousb_driver = { |
353 | .name = "metro-usb", | |
354 | .probe = usb_serial_probe, | |
355 | .disconnect = usb_serial_disconnect, | |
356 | .id_table = id_table | |
357 | }; | |
358 | ||
9fbd1649 GKH |
359 | static struct usb_serial_driver metrousb_device = { |
360 | .driver = { | |
361 | .owner = THIS_MODULE, | |
362 | .name = "metro-usb", | |
363 | }, | |
364 | .description = "Metrologic USB to serial converter.", | |
365 | .id_table = id_table, | |
366 | .num_ports = 1, | |
367 | .open = metrousb_open, | |
368 | .close = metrousb_cleanup, | |
369 | .read_int_callback = metrousb_read_int_callback, | |
370 | .attach = metrousb_startup, | |
371 | .release = metrousb_shutdown, | |
372 | .throttle = metrousb_throttle, | |
373 | .unthrottle = metrousb_unthrottle, | |
374 | .tiocmget = metrousb_tiocmget, | |
375 | .tiocmset = metrousb_tiocmset, | |
376 | }; | |
377 | ||
378 | static struct usb_serial_driver * const serial_drivers[] = { | |
379 | &metrousb_device, | |
380 | NULL, | |
381 | }; | |
382 | ||
1935e357 GKH |
383 | module_usb_serial_driver(metrousb_driver, serial_drivers); |
384 | ||
43d186fe | 385 | MODULE_LICENSE("GPL"); |
d4cbd6e9 GKH |
386 | MODULE_AUTHOR("Philip Nicastro"); |
387 | MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>"); | |
388 | MODULE_DESCRIPTION(DRIVER_DESC); | |
43d186fe AB |
389 | |
390 | /* Module input parameters */ | |
391 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
392 | MODULE_PARM_DESC(debug, "Print debug info (bool 1=on, 0=off)"); |