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1// SPDX-License-Identifier: GPL-2.0
2/*
3 Some of this code is credited to Linux USB open source files that are
4 distributed with Linux.
5
6 Copyright: 2007 Metrologic Instruments. All rights reserved.
7 Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
8*/
9
10#include <linux/kernel.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>
22
23#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
24
25/* Product information. */
26#define FOCUS_VENDOR_ID 0x0C2E
27#define FOCUS_PRODUCT_ID_BI 0x0720
28#define FOCUS_PRODUCT_ID_UNI 0x0700
29
30#define METROUSB_SET_REQUEST_TYPE 0x40
31#define METROUSB_SET_MODEM_CTRL_REQUEST 10
32#define METROUSB_SET_BREAK_REQUEST 0x40
33#define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
34#define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
35#define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
36#define WDR_TIMEOUT 5000 /* default urb timeout. */
37
38/* Private data structure. */
39struct metrousb_private {
40 spinlock_t lock;
41 int throttled;
42 unsigned long control_state;
43};
44
45/* Device table list. */
46static const struct usb_device_id id_table[] = {
47 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
48 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
49 { USB_DEVICE_INTERFACE_CLASS(0x0c2e, 0x0730, 0xff) }, /* MS7820 */
50 { }, /* Terminating entry. */
51};
52MODULE_DEVICE_TABLE(usb, id_table);
53
54/* UNI-Directional mode commands for device configure */
55#define UNI_CMD_OPEN 0x80
56#define UNI_CMD_CLOSE 0xFF
57
58static int metrousb_is_unidirectional_mode(struct usb_serial *serial)
59{
60 u16 product_id = le16_to_cpu(serial->dev->descriptor.idProduct);
61
62 return product_id == FOCUS_PRODUCT_ID_UNI;
63}
64
65static int metrousb_calc_num_ports(struct usb_serial *serial,
66 struct usb_serial_endpoints *epds)
67{
68 if (metrousb_is_unidirectional_mode(serial)) {
69 if (epds->num_interrupt_out == 0) {
70 dev_err(&serial->interface->dev, "interrupt-out endpoint missing\n");
71 return -ENODEV;
72 }
73 }
74
75 return 1;
76}
77
78static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
79{
80 int ret;
81 int actual_len;
82 u8 *buffer_cmd = NULL;
83
84 if (!metrousb_is_unidirectional_mode(port->serial))
85 return 0;
86
87 buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
88 if (!buffer_cmd)
89 return -ENOMEM;
90
91 *buffer_cmd = cmd;
92
93 ret = usb_interrupt_msg(port->serial->dev,
94 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
95 buffer_cmd, sizeof(cmd),
96 &actual_len, USB_CTRL_SET_TIMEOUT);
97
98 kfree(buffer_cmd);
99
100 if (ret < 0)
101 return ret;
102 else if (actual_len != sizeof(cmd))
103 return -EIO;
104 return 0;
105}
106
107static void metrousb_read_int_callback(struct urb *urb)
108{
109 struct usb_serial_port *port = urb->context;
110 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
111 unsigned char *data = urb->transfer_buffer;
112 unsigned long flags;
113 int throttled = 0;
114 int result = 0;
115
116 dev_dbg(&port->dev, "%s\n", __func__);
117
118 switch (urb->status) {
119 case 0:
120 /* Success status, read from the port. */
121 break;
122 case -ECONNRESET:
123 case -ENOENT:
124 case -ESHUTDOWN:
125 /* urb has been terminated. */
126 dev_dbg(&port->dev,
127 "%s - urb shutting down, error code=%d\n",
128 __func__, urb->status);
129 return;
130 default:
131 dev_dbg(&port->dev,
132 "%s - non-zero urb received, error code=%d\n",
133 __func__, urb->status);
134 goto exit;
135 }
136
137
138 /* Set the data read from the usb port into the serial port buffer. */
139 if (urb->actual_length) {
140 /* Loop through the data copying each byte to the tty layer. */
141 tty_insert_flip_string(&port->port, data, urb->actual_length);
142
143 /* Force the data to the tty layer. */
144 tty_flip_buffer_push(&port->port);
145 }
146
147 /* Set any port variables. */
148 spin_lock_irqsave(&metro_priv->lock, flags);
149 throttled = metro_priv->throttled;
150 spin_unlock_irqrestore(&metro_priv->lock, flags);
151
152 if (throttled)
153 return;
154exit:
155 /* Try to resubmit the urb. */
156 result = usb_submit_urb(urb, GFP_ATOMIC);
157 if (result)
158 dev_err(&port->dev,
159 "%s - failed submitting interrupt in urb, error code=%d\n",
160 __func__, result);
161}
162
163static void metrousb_cleanup(struct usb_serial_port *port)
164{
165 usb_kill_urb(port->interrupt_in_urb);
166
167 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
168}
169
170static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
171{
172 struct usb_serial *serial = port->serial;
173 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
174 unsigned long flags;
175 int result = 0;
176
177 /* Set the private data information for the port. */
178 spin_lock_irqsave(&metro_priv->lock, flags);
179 metro_priv->control_state = 0;
180 metro_priv->throttled = 0;
181 spin_unlock_irqrestore(&metro_priv->lock, flags);
182
183 /* Clear the urb pipe. */
184 usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
185
186 /* Start reading from the device */
187 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
188 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
189 port->interrupt_in_urb->transfer_buffer,
190 port->interrupt_in_urb->transfer_buffer_length,
191 metrousb_read_int_callback, port, 1);
192 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
193
194 if (result) {
195 dev_err(&port->dev,
196 "%s - failed submitting interrupt in urb, error code=%d\n",
197 __func__, result);
198 return result;
199 }
200
201 /* Send activate cmd to device */
202 result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
203 if (result) {
204 dev_err(&port->dev,
205 "%s - failed to configure device, error code=%d\n",
206 __func__, result);
207 goto err_kill_urb;
208 }
209
210 return 0;
211
212err_kill_urb:
213 usb_kill_urb(port->interrupt_in_urb);
214
215 return result;
216}
217
218static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
219{
220 int retval = 0;
221 unsigned char mcr = METROUSB_MCR_NONE;
222
223 dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
224 __func__, control_state);
225
226 /* Set the modem control value. */
227 if (control_state & TIOCM_DTR)
228 mcr |= METROUSB_MCR_DTR;
229 if (control_state & TIOCM_RTS)
230 mcr |= METROUSB_MCR_RTS;
231
232 /* Send the command to the usb port. */
233 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
234 METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
235 control_state, 0, NULL, 0, WDR_TIMEOUT);
236 if (retval < 0)
237 dev_err(&serial->dev->dev,
238 "%s - set modem ctrl=0x%x failed, error code=%d\n",
239 __func__, mcr, retval);
240
241 return retval;
242}
243
244static int metrousb_port_probe(struct usb_serial_port *port)
245{
246 struct metrousb_private *metro_priv;
247
248 metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL);
249 if (!metro_priv)
250 return -ENOMEM;
251
252 spin_lock_init(&metro_priv->lock);
253
254 usb_set_serial_port_data(port, metro_priv);
255
256 return 0;
257}
258
259static void metrousb_port_remove(struct usb_serial_port *port)
260{
261 struct metrousb_private *metro_priv;
262
263 metro_priv = usb_get_serial_port_data(port);
264 kfree(metro_priv);
265}
266
267static void metrousb_throttle(struct tty_struct *tty)
268{
269 struct usb_serial_port *port = tty->driver_data;
270 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
271 unsigned long flags;
272
273 /* Set the private information for the port to stop reading data. */
274 spin_lock_irqsave(&metro_priv->lock, flags);
275 metro_priv->throttled = 1;
276 spin_unlock_irqrestore(&metro_priv->lock, flags);
277}
278
279static int metrousb_tiocmget(struct tty_struct *tty)
280{
281 unsigned long control_state = 0;
282 struct usb_serial_port *port = tty->driver_data;
283 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
284 unsigned long flags;
285
286 spin_lock_irqsave(&metro_priv->lock, flags);
287 control_state = metro_priv->control_state;
288 spin_unlock_irqrestore(&metro_priv->lock, flags);
289
290 return control_state;
291}
292
293static int metrousb_tiocmset(struct tty_struct *tty,
294 unsigned int set, unsigned int clear)
295{
296 struct usb_serial_port *port = tty->driver_data;
297 struct usb_serial *serial = port->serial;
298 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
299 unsigned long flags;
300 unsigned long control_state = 0;
301
302 dev_dbg(&port->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);
303
304 spin_lock_irqsave(&metro_priv->lock, flags);
305 control_state = metro_priv->control_state;
306
307 /* Set the RTS and DTR values. */
308 if (set & TIOCM_RTS)
309 control_state |= TIOCM_RTS;
310 if (set & TIOCM_DTR)
311 control_state |= TIOCM_DTR;
312 if (clear & TIOCM_RTS)
313 control_state &= ~TIOCM_RTS;
314 if (clear & TIOCM_DTR)
315 control_state &= ~TIOCM_DTR;
316
317 metro_priv->control_state = control_state;
318 spin_unlock_irqrestore(&metro_priv->lock, flags);
319 return metrousb_set_modem_ctrl(serial, control_state);
320}
321
322static void metrousb_unthrottle(struct tty_struct *tty)
323{
324 struct usb_serial_port *port = tty->driver_data;
325 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
326 unsigned long flags;
327 int result = 0;
328
329 /* Set the private information for the port to resume reading data. */
330 spin_lock_irqsave(&metro_priv->lock, flags);
331 metro_priv->throttled = 0;
332 spin_unlock_irqrestore(&metro_priv->lock, flags);
333
334 /* Submit the urb to read from the port. */
335 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
336 if (result)
337 dev_err(&port->dev,
338 "failed submitting interrupt in urb error code=%d\n",
339 result);
340}
341
342static struct usb_serial_driver metrousb_device = {
343 .driver = {
344 .owner = THIS_MODULE,
345 .name = "metro-usb",
346 },
347 .description = "Metrologic USB to Serial",
348 .id_table = id_table,
349 .num_interrupt_in = 1,
350 .calc_num_ports = metrousb_calc_num_ports,
351 .open = metrousb_open,
352 .close = metrousb_cleanup,
353 .read_int_callback = metrousb_read_int_callback,
354 .port_probe = metrousb_port_probe,
355 .port_remove = metrousb_port_remove,
356 .throttle = metrousb_throttle,
357 .unthrottle = metrousb_unthrottle,
358 .tiocmget = metrousb_tiocmget,
359 .tiocmset = metrousb_tiocmset,
360};
361
362static struct usb_serial_driver * const serial_drivers[] = {
363 &metrousb_device,
364 NULL,
365};
366
367module_usb_serial_driver(serial_drivers, id_table);
368
369MODULE_LICENSE("GPL v2");
370MODULE_AUTHOR("Philip Nicastro");
371MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
372MODULE_DESCRIPTION(DRIVER_DESC);
1/*
2 Some of this code is credited to Linux USB open source files that are
3 distributed with Linux.
4
5 Copyright: 2007 Metrologic Instruments. All rights reserved.
6 Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
7*/
8
9#include <linux/kernel.h>
10#include <linux/tty.h>
11#include <linux/module.h>
12#include <linux/usb.h>
13#include <linux/errno.h>
14#include <linux/slab.h>
15#include <linux/tty_driver.h>
16#include <linux/tty_flip.h>
17#include <linux/moduleparam.h>
18#include <linux/spinlock.h>
19#include <linux/uaccess.h>
20#include <linux/usb/serial.h>
21
22#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
23
24/* Product information. */
25#define FOCUS_VENDOR_ID 0x0C2E
26#define FOCUS_PRODUCT_ID_BI 0x0720
27#define FOCUS_PRODUCT_ID_UNI 0x0700
28
29#define METROUSB_SET_REQUEST_TYPE 0x40
30#define METROUSB_SET_MODEM_CTRL_REQUEST 10
31#define METROUSB_SET_BREAK_REQUEST 0x40
32#define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
33#define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
34#define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
35#define WDR_TIMEOUT 5000 /* default urb timeout. */
36
37/* Private data structure. */
38struct metrousb_private {
39 spinlock_t lock;
40 int throttled;
41 unsigned long control_state;
42};
43
44/* Device table list. */
45static const struct usb_device_id id_table[] = {
46 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
47 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
48 { }, /* Terminating entry. */
49};
50MODULE_DEVICE_TABLE(usb, id_table);
51
52/* UNI-Directional mode commands for device configure */
53#define UNI_CMD_OPEN 0x80
54#define UNI_CMD_CLOSE 0xFF
55
56static inline int metrousb_is_unidirectional_mode(struct usb_serial_port *port)
57{
58 __u16 product_id = le16_to_cpu(
59 port->serial->dev->descriptor.idProduct);
60
61 return product_id == FOCUS_PRODUCT_ID_UNI;
62}
63
64static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
65{
66 int ret;
67 int actual_len;
68 u8 *buffer_cmd = NULL;
69
70 if (!metrousb_is_unidirectional_mode(port))
71 return 0;
72
73 buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
74 if (!buffer_cmd)
75 return -ENOMEM;
76
77 *buffer_cmd = cmd;
78
79 ret = usb_interrupt_msg(port->serial->dev,
80 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
81 buffer_cmd, sizeof(cmd),
82 &actual_len, USB_CTRL_SET_TIMEOUT);
83
84 kfree(buffer_cmd);
85
86 if (ret < 0)
87 return ret;
88 else if (actual_len != sizeof(cmd))
89 return -EIO;
90 return 0;
91}
92
93static void metrousb_read_int_callback(struct urb *urb)
94{
95 struct usb_serial_port *port = urb->context;
96 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
97 unsigned char *data = urb->transfer_buffer;
98 int throttled = 0;
99 int result = 0;
100 unsigned long flags = 0;
101
102 dev_dbg(&port->dev, "%s\n", __func__);
103
104 switch (urb->status) {
105 case 0:
106 /* Success status, read from the port. */
107 break;
108 case -ECONNRESET:
109 case -ENOENT:
110 case -ESHUTDOWN:
111 /* urb has been terminated. */
112 dev_dbg(&port->dev,
113 "%s - urb shutting down, error code=%d\n",
114 __func__, urb->status);
115 return;
116 default:
117 dev_dbg(&port->dev,
118 "%s - non-zero urb received, error code=%d\n",
119 __func__, urb->status);
120 goto exit;
121 }
122
123
124 /* Set the data read from the usb port into the serial port buffer. */
125 if (urb->actual_length) {
126 /* Loop through the data copying each byte to the tty layer. */
127 tty_insert_flip_string(&port->port, data, urb->actual_length);
128
129 /* Force the data to the tty layer. */
130 tty_flip_buffer_push(&port->port);
131 }
132
133 /* Set any port variables. */
134 spin_lock_irqsave(&metro_priv->lock, flags);
135 throttled = metro_priv->throttled;
136 spin_unlock_irqrestore(&metro_priv->lock, flags);
137
138 /* Continue trying to read if set. */
139 if (!throttled) {
140 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
141 usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
142 port->interrupt_in_urb->transfer_buffer,
143 port->interrupt_in_urb->transfer_buffer_length,
144 metrousb_read_int_callback, port, 1);
145
146 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
147
148 if (result)
149 dev_err(&port->dev,
150 "%s - failed submitting interrupt in urb, error code=%d\n",
151 __func__, result);
152 }
153 return;
154
155exit:
156 /* Try to resubmit the urb. */
157 result = usb_submit_urb(urb, GFP_ATOMIC);
158 if (result)
159 dev_err(&port->dev,
160 "%s - failed submitting interrupt in urb, error code=%d\n",
161 __func__, result);
162}
163
164static void metrousb_write_int_callback(struct urb *urb)
165{
166 struct usb_serial_port *port = urb->context;
167
168 dev_warn(&port->dev, "%s not implemented yet.\n",
169 __func__);
170}
171
172static void metrousb_cleanup(struct usb_serial_port *port)
173{
174 dev_dbg(&port->dev, "%s\n", __func__);
175
176 usb_unlink_urb(port->interrupt_in_urb);
177 usb_kill_urb(port->interrupt_in_urb);
178
179 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
180}
181
182static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
183{
184 struct usb_serial *serial = port->serial;
185 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
186 unsigned long flags = 0;
187 int result = 0;
188
189 dev_dbg(&port->dev, "%s\n", __func__);
190
191 /* Make sure the urb is initialized. */
192 if (!port->interrupt_in_urb) {
193 dev_err(&port->dev, "%s - interrupt urb not initialized\n",
194 __func__);
195 return -ENODEV;
196 }
197
198 /* Set the private data information for the port. */
199 spin_lock_irqsave(&metro_priv->lock, flags);
200 metro_priv->control_state = 0;
201 metro_priv->throttled = 0;
202 spin_unlock_irqrestore(&metro_priv->lock, flags);
203
204 /* Clear the urb pipe. */
205 usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
206
207 /* Start reading from the device */
208 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
209 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
210 port->interrupt_in_urb->transfer_buffer,
211 port->interrupt_in_urb->transfer_buffer_length,
212 metrousb_read_int_callback, port, 1);
213 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
214
215 if (result) {
216 dev_err(&port->dev,
217 "%s - failed submitting interrupt in urb, error code=%d\n",
218 __func__, result);
219 goto exit;
220 }
221
222 /* Send activate cmd to device */
223 result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
224 if (result) {
225 dev_err(&port->dev,
226 "%s - failed to configure device, error code=%d\n",
227 __func__, result);
228 goto exit;
229 }
230
231 dev_dbg(&port->dev, "%s - port open\n", __func__);
232exit:
233 return result;
234}
235
236static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
237{
238 int retval = 0;
239 unsigned char mcr = METROUSB_MCR_NONE;
240
241 dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
242 __func__, control_state);
243
244 /* Set the modem control value. */
245 if (control_state & TIOCM_DTR)
246 mcr |= METROUSB_MCR_DTR;
247 if (control_state & TIOCM_RTS)
248 mcr |= METROUSB_MCR_RTS;
249
250 /* Send the command to the usb port. */
251 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
252 METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
253 control_state, 0, NULL, 0, WDR_TIMEOUT);
254 if (retval < 0)
255 dev_err(&serial->dev->dev,
256 "%s - set modem ctrl=0x%x failed, error code=%d\n",
257 __func__, mcr, retval);
258
259 return retval;
260}
261
262static int metrousb_port_probe(struct usb_serial_port *port)
263{
264 struct metrousb_private *metro_priv;
265
266 metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL);
267 if (!metro_priv)
268 return -ENOMEM;
269
270 spin_lock_init(&metro_priv->lock);
271
272 usb_set_serial_port_data(port, metro_priv);
273
274 return 0;
275}
276
277static int metrousb_port_remove(struct usb_serial_port *port)
278{
279 struct metrousb_private *metro_priv;
280
281 metro_priv = usb_get_serial_port_data(port);
282 kfree(metro_priv);
283
284 return 0;
285}
286
287static void metrousb_throttle(struct tty_struct *tty)
288{
289 struct usb_serial_port *port = tty->driver_data;
290 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
291 unsigned long flags = 0;
292
293 dev_dbg(tty->dev, "%s\n", __func__);
294
295 /* Set the private information for the port to stop reading data. */
296 spin_lock_irqsave(&metro_priv->lock, flags);
297 metro_priv->throttled = 1;
298 spin_unlock_irqrestore(&metro_priv->lock, flags);
299}
300
301static int metrousb_tiocmget(struct tty_struct *tty)
302{
303 unsigned long control_state = 0;
304 struct usb_serial_port *port = tty->driver_data;
305 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
306 unsigned long flags = 0;
307
308 dev_dbg(tty->dev, "%s\n", __func__);
309
310 spin_lock_irqsave(&metro_priv->lock, flags);
311 control_state = metro_priv->control_state;
312 spin_unlock_irqrestore(&metro_priv->lock, flags);
313
314 return control_state;
315}
316
317static int metrousb_tiocmset(struct tty_struct *tty,
318 unsigned int set, unsigned int clear)
319{
320 struct usb_serial_port *port = tty->driver_data;
321 struct usb_serial *serial = port->serial;
322 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
323 unsigned long flags = 0;
324 unsigned long control_state = 0;
325
326 dev_dbg(tty->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);
327
328 spin_lock_irqsave(&metro_priv->lock, flags);
329 control_state = metro_priv->control_state;
330
331 /* Set the RTS and DTR values. */
332 if (set & TIOCM_RTS)
333 control_state |= TIOCM_RTS;
334 if (set & TIOCM_DTR)
335 control_state |= TIOCM_DTR;
336 if (clear & TIOCM_RTS)
337 control_state &= ~TIOCM_RTS;
338 if (clear & TIOCM_DTR)
339 control_state &= ~TIOCM_DTR;
340
341 metro_priv->control_state = control_state;
342 spin_unlock_irqrestore(&metro_priv->lock, flags);
343 return metrousb_set_modem_ctrl(serial, control_state);
344}
345
346static void metrousb_unthrottle(struct tty_struct *tty)
347{
348 struct usb_serial_port *port = tty->driver_data;
349 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
350 unsigned long flags = 0;
351 int result = 0;
352
353 dev_dbg(tty->dev, "%s\n", __func__);
354
355 /* Set the private information for the port to resume reading data. */
356 spin_lock_irqsave(&metro_priv->lock, flags);
357 metro_priv->throttled = 0;
358 spin_unlock_irqrestore(&metro_priv->lock, flags);
359
360 /* Submit the urb to read from the port. */
361 port->interrupt_in_urb->dev = port->serial->dev;
362 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
363 if (result)
364 dev_err(tty->dev,
365 "failed submitting interrupt in urb error code=%d\n",
366 result);
367}
368
369static struct usb_serial_driver metrousb_device = {
370 .driver = {
371 .owner = THIS_MODULE,
372 .name = "metro-usb",
373 },
374 .description = "Metrologic USB to Serial",
375 .id_table = id_table,
376 .num_ports = 1,
377 .open = metrousb_open,
378 .close = metrousb_cleanup,
379 .read_int_callback = metrousb_read_int_callback,
380 .write_int_callback = metrousb_write_int_callback,
381 .port_probe = metrousb_port_probe,
382 .port_remove = metrousb_port_remove,
383 .throttle = metrousb_throttle,
384 .unthrottle = metrousb_unthrottle,
385 .tiocmget = metrousb_tiocmget,
386 .tiocmset = metrousb_tiocmset,
387};
388
389static struct usb_serial_driver * const serial_drivers[] = {
390 &metrousb_device,
391 NULL,
392};
393
394module_usb_serial_driver(serial_drivers, id_table);
395
396MODULE_LICENSE("GPL");
397MODULE_AUTHOR("Philip Nicastro");
398MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
399MODULE_DESCRIPTION(DRIVER_DESC);