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43d186fe 1/*
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2 Some of this code is credited to Linux USB open source files that are
3 distributed with Linux.
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4
5 Copyright: 2007 Metrologic Instruments. All rights reserved.
6 Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
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7*/
8
9#include <linux/kernel.h>
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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>
d4cbd6e9 19#include <linux/uaccess.h>
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20#include <linux/usb/serial.h>
21
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22#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
23
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24/* Product information. */
25#define FOCUS_VENDOR_ID 0x0C2E
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26#define FOCUS_PRODUCT_ID_BI 0x0720
27#define FOCUS_PRODUCT_ID_UNI 0x0700
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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. */
d4cbd6e9 35#define WDR_TIMEOUT 5000 /* default urb timeout. */
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36
37/* Private data structure. */
38struct metrousb_private {
39 spinlock_t lock;
40 int throttled;
41 unsigned long control_state;
42};
43
43d186fe 44/* Device table list. */
5c6b98dd 45static const struct usb_device_id id_table[] = {
810ec78e 46 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
43d186fe 47 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
de03bbe0 48 { USB_DEVICE_INTERFACE_CLASS(0x0c2e, 0x0730, 0xff) }, /* MS7820 */
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49 { }, /* Terminating entry. */
50};
51MODULE_DEVICE_TABLE(usb, id_table);
52
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53/* UNI-Directional mode commands for device configure */
54#define UNI_CMD_OPEN 0x80
55#define UNI_CMD_CLOSE 0xFF
56
8f24c490 57static inline int metrousb_is_unidirectional_mode(struct usb_serial_port *port)
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58{
59 __u16 product_id = le16_to_cpu(
60 port->serial->dev->descriptor.idProduct);
61
62 return product_id == FOCUS_PRODUCT_ID_UNI;
63}
64
65static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
66{
67 int ret;
68 int actual_len;
69 u8 *buffer_cmd = NULL;
70
71 if (!metrousb_is_unidirectional_mode(port))
72 return 0;
73
74 buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
75 if (!buffer_cmd)
76 return -ENOMEM;
77
78 *buffer_cmd = cmd;
79
80 ret = usb_interrupt_msg(port->serial->dev,
81 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
82 buffer_cmd, sizeof(cmd),
83 &actual_len, USB_CTRL_SET_TIMEOUT);
84
85 kfree(buffer_cmd);
86
87 if (ret < 0)
88 return ret;
89 else if (actual_len != sizeof(cmd))
90 return -EIO;
91 return 0;
92}
93
9fbd1649 94static void metrousb_read_int_callback(struct urb *urb)
43d186fe 95{
8111e4ec 96 struct usb_serial_port *port = urb->context;
9fbd1649 97 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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98 unsigned char *data = urb->transfer_buffer;
99 int throttled = 0;
100 int result = 0;
101 unsigned long flags = 0;
102
5db51b50 103 dev_dbg(&port->dev, "%s\n", __func__);
43d186fe 104
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105 switch (urb->status) {
106 case 0:
107 /* Success status, read from the port. */
108 break;
109 case -ECONNRESET:
110 case -ENOENT:
111 case -ESHUTDOWN:
112 /* urb has been terminated. */
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113 dev_dbg(&port->dev,
114 "%s - urb shutting down, error code=%d\n",
bd2c09bc 115 __func__, urb->status);
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116 return;
117 default:
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118 dev_dbg(&port->dev,
119 "%s - non-zero urb received, error code=%d\n",
bd2c09bc 120 __func__, urb->status);
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121 goto exit;
122 }
123
124
125 /* Set the data read from the usb port into the serial port buffer. */
2e124b4a 126 if (urb->actual_length) {
9fbd1649 127 /* Loop through the data copying each byte to the tty layer. */
05c7cd39 128 tty_insert_flip_string(&port->port, data, urb->actual_length);
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129
130 /* Force the data to the tty layer. */
2e124b4a 131 tty_flip_buffer_push(&port->port);
9fbd1649 132 }
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133
134 /* Set any port variables. */
135 spin_lock_irqsave(&metro_priv->lock, flags);
136 throttled = metro_priv->throttled;
137 spin_unlock_irqrestore(&metro_priv->lock, flags);
138
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139 if (throttled)
140 return;
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141exit:
142 /* Try to resubmit the urb. */
143 result = usb_submit_urb(urb, GFP_ATOMIC);
5db51b50 144 if (result)
91fbecfe 145 dev_err(&port->dev,
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146 "%s - failed submitting interrupt in urb, error code=%d\n",
147 __func__, result);
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148}
149
9fbd1649 150static void metrousb_cleanup(struct usb_serial_port *port)
43d186fe 151{
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152 usb_kill_urb(port->interrupt_in_urb);
153
5813f281 154 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
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155}
156
d4cbd6e9 157static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
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158{
159 struct usb_serial *serial = port->serial;
160 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
161 unsigned long flags = 0;
162 int result = 0;
163
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164 /* Make sure the urb is initialized. */
165 if (!port->interrupt_in_urb) {
91fbecfe 166 dev_err(&port->dev, "%s - interrupt urb not initialized\n",
5db51b50 167 __func__);
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168 return -ENODEV;
169 }
170
171 /* Set the private data information for the port. */
172 spin_lock_irqsave(&metro_priv->lock, flags);
173 metro_priv->control_state = 0;
174 metro_priv->throttled = 0;
175 spin_unlock_irqrestore(&metro_priv->lock, flags);
176
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177 /* Clear the urb pipe. */
178 usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
179
180 /* Start reading from the device */
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181 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
182 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
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183 port->interrupt_in_urb->transfer_buffer,
184 port->interrupt_in_urb->transfer_buffer_length,
185 metrousb_read_int_callback, port, 1);
186 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
187
188 if (result) {
91fbecfe 189 dev_err(&port->dev,
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190 "%s - failed submitting interrupt in urb, error code=%d\n",
191 __func__, result);
5d7e6b00 192 return result;
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193 }
194
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195 /* Send activate cmd to device */
196 result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
197 if (result) {
198 dev_err(&port->dev,
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199 "%s - failed to configure device, error code=%d\n",
200 __func__, result);
5d7e6b00 201 goto err_kill_urb;
70457786 202 }
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203
204 return 0;
205
206err_kill_urb:
207 usb_kill_urb(port->interrupt_in_urb);
208
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209 return result;
210}
211
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212static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
213{
214 int retval = 0;
215 unsigned char mcr = METROUSB_MCR_NONE;
216
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217 dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
218 __func__, control_state);
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219
220 /* Set the modem control value. */
221 if (control_state & TIOCM_DTR)
222 mcr |= METROUSB_MCR_DTR;
223 if (control_state & TIOCM_RTS)
224 mcr |= METROUSB_MCR_RTS;
225
226 /* Send the command to the usb port. */
227 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
228 METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
229 control_state, 0, NULL, 0, WDR_TIMEOUT);
230 if (retval < 0)
91fbecfe 231 dev_err(&serial->dev->dev,
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232 "%s - set modem ctrl=0x%x failed, error code=%d\n",
233 __func__, mcr, retval);
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234
235 return retval;
236}
237
50dde868 238static int metrousb_port_probe(struct usb_serial_port *port)
43d186fe 239{
50dde868 240 struct metrousb_private *metro_priv;
43d186fe 241
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242 metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL);
243 if (!metro_priv)
244 return -ENOMEM;
43d186fe 245
50dde868 246 spin_lock_init(&metro_priv->lock);
43d186fe 247
50dde868 248 usb_set_serial_port_data(port, metro_priv);
43d186fe 249
50dde868 250 return 0;
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251}
252
50dde868 253static int metrousb_port_remove(struct usb_serial_port *port)
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254{
255 struct metrousb_private *metro_priv;
43d186fe 256
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257 metro_priv = usb_get_serial_port_data(port);
258 kfree(metro_priv);
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259
260 return 0;
261}
262
d4cbd6e9 263static void metrousb_throttle(struct tty_struct *tty)
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264{
265 struct usb_serial_port *port = tty->driver_data;
266 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
267 unsigned long flags = 0;
268
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269 /* Set the private information for the port to stop reading data. */
270 spin_lock_irqsave(&metro_priv->lock, flags);
271 metro_priv->throttled = 1;
272 spin_unlock_irqrestore(&metro_priv->lock, flags);
273}
274
d4cbd6e9 275static int metrousb_tiocmget(struct tty_struct *tty)
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276{
277 unsigned long control_state = 0;
278 struct usb_serial_port *port = tty->driver_data;
279 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
280 unsigned long flags = 0;
281
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282 spin_lock_irqsave(&metro_priv->lock, flags);
283 control_state = metro_priv->control_state;
284 spin_unlock_irqrestore(&metro_priv->lock, flags);
285
286 return control_state;
287}
288
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289static int metrousb_tiocmset(struct tty_struct *tty,
290 unsigned int set, unsigned int clear)
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291{
292 struct usb_serial_port *port = tty->driver_data;
293 struct usb_serial *serial = port->serial;
294 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
295 unsigned long flags = 0;
296 unsigned long control_state = 0;
297
5db51b50 298 dev_dbg(tty->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);
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299
300 spin_lock_irqsave(&metro_priv->lock, flags);
301 control_state = metro_priv->control_state;
302
d4cbd6e9 303 /* Set the RTS and DTR values. */
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304 if (set & TIOCM_RTS)
305 control_state |= TIOCM_RTS;
306 if (set & TIOCM_DTR)
307 control_state |= TIOCM_DTR;
308 if (clear & TIOCM_RTS)
309 control_state &= ~TIOCM_RTS;
310 if (clear & TIOCM_DTR)
311 control_state &= ~TIOCM_DTR;
312
313 metro_priv->control_state = control_state;
314 spin_unlock_irqrestore(&metro_priv->lock, flags);
315 return metrousb_set_modem_ctrl(serial, control_state);
316}
317
d4cbd6e9 318static void metrousb_unthrottle(struct tty_struct *tty)
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319{
320 struct usb_serial_port *port = tty->driver_data;
321 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
322 unsigned long flags = 0;
323 int result = 0;
324
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325 /* Set the private information for the port to resume reading data. */
326 spin_lock_irqsave(&metro_priv->lock, flags);
327 metro_priv->throttled = 0;
328 spin_unlock_irqrestore(&metro_priv->lock, flags);
329
330 /* Submit the urb to read from the port. */
43d186fe 331 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
5db51b50 332 if (result)
91fbecfe 333 dev_err(tty->dev,
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334 "failed submitting interrupt in urb error code=%d\n",
335 result);
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336}
337
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338static struct usb_serial_driver metrousb_device = {
339 .driver = {
340 .owner = THIS_MODULE,
341 .name = "metro-usb",
342 },
e2dd3af4 343 .description = "Metrologic USB to Serial",
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344 .id_table = id_table,
345 .num_ports = 1,
346 .open = metrousb_open,
347 .close = metrousb_cleanup,
348 .read_int_callback = metrousb_read_int_callback,
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349 .port_probe = metrousb_port_probe,
350 .port_remove = metrousb_port_remove,
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351 .throttle = metrousb_throttle,
352 .unthrottle = metrousb_unthrottle,
353 .tiocmget = metrousb_tiocmget,
354 .tiocmset = metrousb_tiocmset,
355};
356
357static struct usb_serial_driver * const serial_drivers[] = {
358 &metrousb_device,
359 NULL,
360};
361
68e24113 362module_usb_serial_driver(serial_drivers, id_table);
1935e357 363
43d186fe 364MODULE_LICENSE("GPL");
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365MODULE_AUTHOR("Philip Nicastro");
366MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
367MODULE_DESCRIPTION(DRIVER_DESC);