2 Some of this code is credited to Linux USB open source files that are
3 distributed with Linux.
5 Copyright: 2007 Metrologic Instruments. All rights reserved.
6 Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
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>
20 #include <linux/uaccess.h>
21 #include <linux/usb/serial.h>
23 /* Version Information */
24 #define DRIVER_VERSION "v1.2.0.0"
25 #define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
27 /* Product information. */
28 #define FOCUS_VENDOR_ID 0x0C2E
29 #define FOCUS_PRODUCT_ID_BI 0x0720
30 #define FOCUS_PRODUCT_ID_UNI 0x0700
32 #define METROUSB_SET_REQUEST_TYPE 0x40
33 #define METROUSB_SET_MODEM_CTRL_REQUEST 10
34 #define METROUSB_SET_BREAK_REQUEST 0x40
35 #define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
36 #define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
37 #define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
38 #define WDR_TIMEOUT 5000 /* default urb timeout. */
40 /* Private data structure. */
41 struct metrousb_private
{
44 unsigned long control_state
;
47 /* Device table list. */
48 static struct usb_device_id id_table
[] = {
49 { USB_DEVICE(FOCUS_VENDOR_ID
, FOCUS_PRODUCT_ID_BI
) },
50 { USB_DEVICE(FOCUS_VENDOR_ID
, FOCUS_PRODUCT_ID_UNI
) },
51 { }, /* Terminating entry. */
53 MODULE_DEVICE_TABLE(usb
, id_table
);
55 /* UNI-Directional mode commands for device configure */
56 #define UNI_CMD_OPEN 0x80
57 #define UNI_CMD_CLOSE 0xFF
59 inline int metrousb_is_unidirectional_mode(struct usb_serial_port
*port
)
61 __u16 product_id
= le16_to_cpu(
62 port
->serial
->dev
->descriptor
.idProduct
);
64 return product_id
== FOCUS_PRODUCT_ID_UNI
;
67 static int metrousb_send_unidirectional_cmd(u8 cmd
, struct usb_serial_port
*port
)
71 u8
*buffer_cmd
= NULL
;
73 if (!metrousb_is_unidirectional_mode(port
))
76 buffer_cmd
= kzalloc(sizeof(cmd
), GFP_KERNEL
);
82 ret
= usb_interrupt_msg(port
->serial
->dev
,
83 usb_sndintpipe(port
->serial
->dev
, port
->interrupt_out_endpointAddress
),
84 buffer_cmd
, sizeof(cmd
),
85 &actual_len
, USB_CTRL_SET_TIMEOUT
);
91 else if (actual_len
!= sizeof(cmd
))
96 static void metrousb_read_int_callback(struct urb
*urb
)
98 struct usb_serial_port
*port
= urb
->context
;
99 struct metrousb_private
*metro_priv
= usb_get_serial_port_data(port
);
100 struct tty_struct
*tty
;
101 unsigned char *data
= urb
->transfer_buffer
;
104 unsigned long flags
= 0;
106 dev_dbg(&port
->dev
, "%s\n", __func__
);
108 switch (urb
->status
) {
110 /* Success status, read from the port. */
115 /* urb has been terminated. */
117 "%s - urb shutting down, error code=%d\n",
118 __func__
, urb
->status
);
122 "%s - non-zero urb received, error code=%d\n",
123 __func__
, urb
->status
);
128 /* Set the data read from the usb port into the serial port buffer. */
129 tty
= tty_port_tty_get(&port
->port
);
130 if (tty
&& urb
->actual_length
) {
131 /* Loop through the data copying each byte to the tty layer. */
132 tty_insert_flip_string(tty
, data
, urb
->actual_length
);
134 /* Force the data to the tty layer. */
135 tty_flip_buffer_push(tty
);
139 /* Set any port variables. */
140 spin_lock_irqsave(&metro_priv
->lock
, flags
);
141 throttled
= metro_priv
->throttled
;
142 spin_unlock_irqrestore(&metro_priv
->lock
, flags
);
144 /* Continue trying to read if set. */
146 usb_fill_int_urb(port
->interrupt_in_urb
, port
->serial
->dev
,
147 usb_rcvintpipe(port
->serial
->dev
, port
->interrupt_in_endpointAddress
),
148 port
->interrupt_in_urb
->transfer_buffer
,
149 port
->interrupt_in_urb
->transfer_buffer_length
,
150 metrousb_read_int_callback
, port
, 1);
152 result
= usb_submit_urb(port
->interrupt_in_urb
, GFP_ATOMIC
);
156 "%s - failed submitting interrupt in urb, error code=%d\n",
162 /* Try to resubmit the urb. */
163 result
= usb_submit_urb(urb
, GFP_ATOMIC
);
166 "%s - failed submitting interrupt in urb, error code=%d\n",
170 static void metrousb_write_int_callback(struct urb
*urb
)
172 struct usb_serial_port
*port
= urb
->context
;
174 dev_warn(&port
->dev
, "%s not implemented yet.\n",
178 static void metrousb_cleanup(struct usb_serial_port
*port
)
180 dev_dbg(&port
->dev
, "%s\n", __func__
);
182 if (port
->serial
->dev
) {
183 /* Shutdown any interrupt in urbs. */
184 if (port
->interrupt_in_urb
) {
185 usb_unlink_urb(port
->interrupt_in_urb
);
186 usb_kill_urb(port
->interrupt_in_urb
);
189 /* Send deactivate cmd to device */
190 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE
, port
);
194 static int metrousb_open(struct tty_struct
*tty
, struct usb_serial_port
*port
)
196 struct usb_serial
*serial
= port
->serial
;
197 struct metrousb_private
*metro_priv
= usb_get_serial_port_data(port
);
198 unsigned long flags
= 0;
201 dev_dbg(&port
->dev
, "%s\n", __func__
);
203 /* Make sure the urb is initialized. */
204 if (!port
->interrupt_in_urb
) {
205 dev_err(&port
->dev
, "%s - interrupt urb not initialized\n",
210 /* Set the private data information for the port. */
211 spin_lock_irqsave(&metro_priv
->lock
, flags
);
212 metro_priv
->control_state
= 0;
213 metro_priv
->throttled
= 0;
214 spin_unlock_irqrestore(&metro_priv
->lock
, flags
);
216 /* Clear the urb pipe. */
217 usb_clear_halt(serial
->dev
, port
->interrupt_in_urb
->pipe
);
219 /* Start reading from the device */
220 usb_fill_int_urb(port
->interrupt_in_urb
, serial
->dev
,
221 usb_rcvintpipe(serial
->dev
, port
->interrupt_in_endpointAddress
),
222 port
->interrupt_in_urb
->transfer_buffer
,
223 port
->interrupt_in_urb
->transfer_buffer_length
,
224 metrousb_read_int_callback
, port
, 1);
225 result
= usb_submit_urb(port
->interrupt_in_urb
, GFP_KERNEL
);
229 "%s - failed submitting interrupt in urb, error code=%d\n",
234 /* Send activate cmd to device */
235 result
= metrousb_send_unidirectional_cmd(UNI_CMD_OPEN
, port
);
238 "%s - failed to configure device for port number=%d, error code=%d\n",
239 __func__
, port
->number
, result
);
243 dev_dbg(&port
->dev
, "%s - port open\n", __func__
);
248 static int metrousb_set_modem_ctrl(struct usb_serial
*serial
, unsigned int control_state
)
251 unsigned char mcr
= METROUSB_MCR_NONE
;
253 dev_dbg(&serial
->dev
->dev
, "%s - control state = %d\n",
254 __func__
, control_state
);
256 /* Set the modem control value. */
257 if (control_state
& TIOCM_DTR
)
258 mcr
|= METROUSB_MCR_DTR
;
259 if (control_state
& TIOCM_RTS
)
260 mcr
|= METROUSB_MCR_RTS
;
262 /* Send the command to the usb port. */
263 retval
= usb_control_msg(serial
->dev
, usb_sndctrlpipe(serial
->dev
, 0),
264 METROUSB_SET_REQUEST_TYPE
, METROUSB_SET_MODEM_CTRL_REQUEST
,
265 control_state
, 0, NULL
, 0, WDR_TIMEOUT
);
267 dev_err(&serial
->dev
->dev
,
268 "%s - set modem ctrl=0x%x failed, error code=%d\n",
269 __func__
, mcr
, retval
);
274 static void metrousb_shutdown(struct usb_serial
*serial
)
278 dev_dbg(&serial
->dev
->dev
, "%s\n", __func__
);
280 /* Stop reading and writing on all ports. */
281 for (i
= 0; i
< serial
->num_ports
; ++i
) {
282 /* Close any open urbs. */
283 metrousb_cleanup(serial
->port
[i
]);
286 kfree(usb_get_serial_port_data(serial
->port
[i
]));
287 usb_set_serial_port_data(serial
->port
[i
], NULL
);
289 dev_dbg(&serial
->dev
->dev
, "%s - freed port number=%d\n",
290 __func__
, serial
->port
[i
]->number
);
294 static int metrousb_startup(struct usb_serial
*serial
)
296 struct metrousb_private
*metro_priv
;
297 struct usb_serial_port
*port
;
300 dev_dbg(&serial
->dev
->dev
, "%s\n", __func__
);
302 /* Loop through the serial ports setting up the private structures.
303 * Currently we only use one port. */
304 for (i
= 0; i
< serial
->num_ports
; ++i
) {
305 port
= serial
->port
[i
];
307 /* Declare memory. */
308 metro_priv
= kzalloc(sizeof(struct metrousb_private
), GFP_KERNEL
);
312 /* Initialize memory. */
313 spin_lock_init(&metro_priv
->lock
);
314 usb_set_serial_port_data(port
, metro_priv
);
316 dev_dbg(&serial
->dev
->dev
, "%s - port number=%d\n ",
317 __func__
, port
->number
);
323 static void metrousb_throttle(struct tty_struct
*tty
)
325 struct usb_serial_port
*port
= tty
->driver_data
;
326 struct metrousb_private
*metro_priv
= usb_get_serial_port_data(port
);
327 unsigned long flags
= 0;
329 dev_dbg(tty
->dev
, "%s\n", __func__
);
331 /* Set the private information for the port to stop reading data. */
332 spin_lock_irqsave(&metro_priv
->lock
, flags
);
333 metro_priv
->throttled
= 1;
334 spin_unlock_irqrestore(&metro_priv
->lock
, flags
);
337 static int metrousb_tiocmget(struct tty_struct
*tty
)
339 unsigned long control_state
= 0;
340 struct usb_serial_port
*port
= tty
->driver_data
;
341 struct metrousb_private
*metro_priv
= usb_get_serial_port_data(port
);
342 unsigned long flags
= 0;
344 dev_dbg(tty
->dev
, "%s\n", __func__
);
346 spin_lock_irqsave(&metro_priv
->lock
, flags
);
347 control_state
= metro_priv
->control_state
;
348 spin_unlock_irqrestore(&metro_priv
->lock
, flags
);
350 return control_state
;
353 static int metrousb_tiocmset(struct tty_struct
*tty
,
354 unsigned int set
, unsigned int clear
)
356 struct usb_serial_port
*port
= tty
->driver_data
;
357 struct usb_serial
*serial
= port
->serial
;
358 struct metrousb_private
*metro_priv
= usb_get_serial_port_data(port
);
359 unsigned long flags
= 0;
360 unsigned long control_state
= 0;
362 dev_dbg(tty
->dev
, "%s - set=%d, clear=%d\n", __func__
, set
, clear
);
364 spin_lock_irqsave(&metro_priv
->lock
, flags
);
365 control_state
= metro_priv
->control_state
;
367 /* Set the RTS and DTR values. */
369 control_state
|= TIOCM_RTS
;
371 control_state
|= TIOCM_DTR
;
372 if (clear
& TIOCM_RTS
)
373 control_state
&= ~TIOCM_RTS
;
374 if (clear
& TIOCM_DTR
)
375 control_state
&= ~TIOCM_DTR
;
377 metro_priv
->control_state
= control_state
;
378 spin_unlock_irqrestore(&metro_priv
->lock
, flags
);
379 return metrousb_set_modem_ctrl(serial
, control_state
);
382 static void metrousb_unthrottle(struct tty_struct
*tty
)
384 struct usb_serial_port
*port
= tty
->driver_data
;
385 struct metrousb_private
*metro_priv
= usb_get_serial_port_data(port
);
386 unsigned long flags
= 0;
389 dev_dbg(tty
->dev
, "%s\n", __func__
);
391 /* Set the private information for the port to resume reading data. */
392 spin_lock_irqsave(&metro_priv
->lock
, flags
);
393 metro_priv
->throttled
= 0;
394 spin_unlock_irqrestore(&metro_priv
->lock
, flags
);
396 /* Submit the urb to read from the port. */
397 port
->interrupt_in_urb
->dev
= port
->serial
->dev
;
398 result
= usb_submit_urb(port
->interrupt_in_urb
, GFP_ATOMIC
);
401 "failed submitting interrupt in urb error code=%d\n",
405 static struct usb_serial_driver metrousb_device
= {
407 .owner
= THIS_MODULE
,
410 .description
= "Metrologic USB to Serial",
411 .id_table
= id_table
,
413 .open
= metrousb_open
,
414 .close
= metrousb_cleanup
,
415 .read_int_callback
= metrousb_read_int_callback
,
416 .write_int_callback
= metrousb_write_int_callback
,
417 .attach
= metrousb_startup
,
418 .release
= metrousb_shutdown
,
419 .throttle
= metrousb_throttle
,
420 .unthrottle
= metrousb_unthrottle
,
421 .tiocmget
= metrousb_tiocmget
,
422 .tiocmset
= metrousb_tiocmset
,
425 static struct usb_serial_driver
* const serial_drivers
[] = {
430 module_usb_serial_driver(serial_drivers
, id_table
);
432 MODULE_LICENSE("GPL");
433 MODULE_AUTHOR("Philip Nicastro");
434 MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
435 MODULE_DESCRIPTION(DRIVER_DESC
);