xref: /openbmc/linux/drivers/usb/serial/mxuport.c (revision 6ff58ae1)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *	mxuport.c - MOXA UPort series driver
4  *
5  *	Copyright (c) 2006 Moxa Technologies Co., Ltd.
6  *	Copyright (c) 2013 Andrew Lunn <andrew@lunn.ch>
7  *
8  *	Supports the following Moxa USB to serial converters:
9  *	 2 ports : UPort 1250, UPort 1250I
10  *	 4 ports : UPort 1410, UPort 1450, UPort 1450I
11  *	 8 ports : UPort 1610-8, UPort 1650-8
12  *	16 ports : UPort 1610-16, UPort 1650-16
13  */
14 
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/firmware.h>
18 #include <linux/jiffies.h>
19 #include <linux/serial.h>
20 #include <linux/serial_reg.h>
21 #include <linux/slab.h>
22 #include <linux/tty.h>
23 #include <linux/tty_driver.h>
24 #include <linux/tty_flip.h>
25 #include <linux/uaccess.h>
26 #include <linux/usb.h>
27 #include <linux/usb/serial.h>
28 #include <asm/unaligned.h>
29 
30 /* Definitions for the vendor ID and device ID */
31 #define MX_USBSERIAL_VID	0x110A
32 #define MX_UPORT1250_PID	0x1250
33 #define MX_UPORT1251_PID	0x1251
34 #define MX_UPORT1410_PID	0x1410
35 #define MX_UPORT1450_PID	0x1450
36 #define MX_UPORT1451_PID	0x1451
37 #define MX_UPORT1618_PID	0x1618
38 #define MX_UPORT1658_PID	0x1658
39 #define MX_UPORT1613_PID	0x1613
40 #define MX_UPORT1653_PID	0x1653
41 
42 /* Definitions for USB info */
43 #define HEADER_SIZE		4
44 #define EVENT_LENGTH		8
45 #define DOWN_BLOCK_SIZE		64
46 
47 /* Definitions for firmware info */
48 #define VER_ADDR_1		0x20
49 #define VER_ADDR_2		0x24
50 #define VER_ADDR_3		0x28
51 
52 /* Definitions for USB vendor request */
53 #define RQ_VENDOR_NONE			0x00
54 #define RQ_VENDOR_SET_BAUD		0x01 /* Set baud rate */
55 #define RQ_VENDOR_SET_LINE		0x02 /* Set line status */
56 #define RQ_VENDOR_SET_CHARS		0x03 /* Set Xon/Xoff chars */
57 #define RQ_VENDOR_SET_RTS		0x04 /* Set RTS */
58 #define RQ_VENDOR_SET_DTR		0x05 /* Set DTR */
59 #define RQ_VENDOR_SET_XONXOFF		0x06 /* Set auto Xon/Xoff */
60 #define RQ_VENDOR_SET_RX_HOST_EN	0x07 /* Set RX host enable */
61 #define RQ_VENDOR_SET_OPEN		0x08 /* Set open/close port */
62 #define RQ_VENDOR_PURGE			0x09 /* Purge Rx/Tx buffer */
63 #define RQ_VENDOR_SET_MCR		0x0A /* Set MCR register */
64 #define RQ_VENDOR_SET_BREAK		0x0B /* Set Break signal */
65 
66 #define RQ_VENDOR_START_FW_DOWN		0x0C /* Start firmware download */
67 #define RQ_VENDOR_STOP_FW_DOWN		0x0D /* Stop firmware download */
68 #define RQ_VENDOR_QUERY_FW_READY	0x0E /* Query if new firmware ready */
69 
70 #define RQ_VENDOR_SET_FIFO_DISABLE	0x0F /* Set fifo disable */
71 #define RQ_VENDOR_SET_INTERFACE		0x10 /* Set interface */
72 #define RQ_VENDOR_SET_HIGH_PERFOR	0x11 /* Set hi-performance */
73 
74 #define RQ_VENDOR_ERASE_BLOCK		0x12 /* Erase flash block */
75 #define RQ_VENDOR_WRITE_PAGE		0x13 /* Write flash page */
76 #define RQ_VENDOR_PREPARE_WRITE		0x14 /* Prepare write flash */
77 #define RQ_VENDOR_CONFIRM_WRITE		0x15 /* Confirm write flash */
78 #define RQ_VENDOR_LOCATE		0x16 /* Locate the device */
79 
80 #define RQ_VENDOR_START_ROM_DOWN	0x17 /* Start firmware download */
81 #define RQ_VENDOR_ROM_DATA		0x18 /* Rom file data */
82 #define RQ_VENDOR_STOP_ROM_DOWN		0x19 /* Stop firmware download */
83 #define RQ_VENDOR_FW_DATA		0x20 /* Firmware data */
84 
85 #define RQ_VENDOR_RESET_DEVICE		0x23 /* Try to reset the device */
86 #define RQ_VENDOR_QUERY_FW_CONFIG	0x24
87 
88 #define RQ_VENDOR_GET_VERSION		0x81 /* Get firmware version */
89 #define RQ_VENDOR_GET_PAGE		0x82 /* Read flash page */
90 #define RQ_VENDOR_GET_ROM_PROC		0x83 /* Get ROM process state */
91 
92 #define RQ_VENDOR_GET_INQUEUE		0x84 /* Data in input buffer */
93 #define RQ_VENDOR_GET_OUTQUEUE		0x85 /* Data in output buffer */
94 
95 #define RQ_VENDOR_GET_MSR		0x86 /* Get modem status register */
96 
97 /* Definitions for UPort event type */
98 #define UPORT_EVENT_NONE		0 /* None */
99 #define UPORT_EVENT_TXBUF_THRESHOLD	1 /* Tx buffer threshold */
100 #define UPORT_EVENT_SEND_NEXT		2 /* Send next */
101 #define UPORT_EVENT_MSR			3 /* Modem status */
102 #define UPORT_EVENT_LSR			4 /* Line status */
103 #define UPORT_EVENT_MCR			5 /* Modem control */
104 
105 /* Definitions for serial event type */
106 #define SERIAL_EV_CTS			0x0008	/* CTS changed state */
107 #define SERIAL_EV_DSR			0x0010	/* DSR changed state */
108 #define SERIAL_EV_RLSD			0x0020	/* RLSD changed state */
109 
110 /* Definitions for modem control event type */
111 #define SERIAL_EV_XOFF			0x40	/* XOFF received */
112 
113 /* Definitions for line control of communication */
114 #define MX_WORDLENGTH_5			5
115 #define MX_WORDLENGTH_6			6
116 #define MX_WORDLENGTH_7			7
117 #define MX_WORDLENGTH_8			8
118 
119 #define MX_PARITY_NONE			0
120 #define MX_PARITY_ODD			1
121 #define MX_PARITY_EVEN			2
122 #define MX_PARITY_MARK			3
123 #define MX_PARITY_SPACE			4
124 
125 #define MX_STOP_BITS_1			0
126 #define MX_STOP_BITS_1_5		1
127 #define MX_STOP_BITS_2			2
128 
129 #define MX_RTS_DISABLE			0x0
130 #define MX_RTS_ENABLE			0x1
131 #define MX_RTS_HW			0x2
132 #define MX_RTS_NO_CHANGE		0x3 /* Flag, not valid register value*/
133 
134 #define MX_INT_RS232			0
135 #define MX_INT_2W_RS485			1
136 #define MX_INT_RS422			2
137 #define MX_INT_4W_RS485			3
138 
139 /* Definitions for holding reason */
140 #define MX_WAIT_FOR_CTS			0x0001
141 #define MX_WAIT_FOR_DSR			0x0002
142 #define MX_WAIT_FOR_DCD			0x0004
143 #define MX_WAIT_FOR_XON			0x0008
144 #define MX_WAIT_FOR_START_TX		0x0010
145 #define MX_WAIT_FOR_UNTHROTTLE		0x0020
146 #define MX_WAIT_FOR_LOW_WATER		0x0040
147 #define MX_WAIT_FOR_SEND_NEXT		0x0080
148 
149 #define MX_UPORT_2_PORT			BIT(0)
150 #define MX_UPORT_4_PORT			BIT(1)
151 #define MX_UPORT_8_PORT			BIT(2)
152 #define MX_UPORT_16_PORT		BIT(3)
153 
154 /* This structure holds all of the local port information */
155 struct mxuport_port {
156 	u8 mcr_state;		/* Last MCR state */
157 	u8 msr_state;		/* Last MSR state */
158 	struct mutex mutex;	/* Protects mcr_state */
159 	spinlock_t spinlock;	/* Protects msr_state */
160 };
161 
162 /* Table of devices that work with this driver */
163 static const struct usb_device_id mxuport_idtable[] = {
164 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1250_PID),
165 	  .driver_info = MX_UPORT_2_PORT },
166 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1251_PID),
167 	  .driver_info = MX_UPORT_2_PORT },
168 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1410_PID),
169 	  .driver_info = MX_UPORT_4_PORT },
170 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1450_PID),
171 	  .driver_info = MX_UPORT_4_PORT },
172 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1451_PID),
173 	  .driver_info = MX_UPORT_4_PORT },
174 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1618_PID),
175 	  .driver_info = MX_UPORT_8_PORT },
176 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1658_PID),
177 	  .driver_info = MX_UPORT_8_PORT },
178 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1613_PID),
179 	  .driver_info = MX_UPORT_16_PORT },
180 	{ USB_DEVICE(MX_USBSERIAL_VID, MX_UPORT1653_PID),
181 	  .driver_info = MX_UPORT_16_PORT },
182 	{}			/* Terminating entry */
183 };
184 
185 MODULE_DEVICE_TABLE(usb, mxuport_idtable);
186 
187 /*
188  * Add a four byte header containing the port number and the number of
189  * bytes of data in the message. Return the number of bytes in the
190  * buffer.
191  */
mxuport_prepare_write_buffer(struct usb_serial_port * port,void * dest,size_t size)192 static int mxuport_prepare_write_buffer(struct usb_serial_port *port,
193 					void *dest, size_t size)
194 {
195 	u8 *buf = dest;
196 	int count;
197 
198 	count = kfifo_out_locked(&port->write_fifo, buf + HEADER_SIZE,
199 				 size - HEADER_SIZE,
200 				 &port->lock);
201 
202 	put_unaligned_be16(port->port_number, buf);
203 	put_unaligned_be16(count, buf + 2);
204 
205 	dev_dbg(&port->dev, "%s - size %zd count %d\n", __func__,
206 		size, count);
207 
208 	return count + HEADER_SIZE;
209 }
210 
211 /* Read the given buffer in from the control pipe. */
mxuport_recv_ctrl_urb(struct usb_serial * serial,u8 request,u16 value,u16 index,u8 * data,size_t size)212 static int mxuport_recv_ctrl_urb(struct usb_serial *serial,
213 				 u8 request, u16 value, u16 index,
214 				 u8 *data, size_t size)
215 {
216 	int status;
217 
218 	status = usb_control_msg(serial->dev,
219 				 usb_rcvctrlpipe(serial->dev, 0),
220 				 request,
221 				 (USB_DIR_IN | USB_TYPE_VENDOR |
222 				  USB_RECIP_DEVICE), value, index,
223 				 data, size,
224 				 USB_CTRL_GET_TIMEOUT);
225 	if (status < 0) {
226 		dev_err(&serial->interface->dev,
227 			"%s - usb_control_msg failed (%d)\n",
228 			__func__, status);
229 		return status;
230 	}
231 
232 	if (status != size) {
233 		dev_err(&serial->interface->dev,
234 			"%s - short read (%d / %zd)\n",
235 			__func__, status, size);
236 		return -EIO;
237 	}
238 
239 	return status;
240 }
241 
242 /* Write the given buffer out to the control pipe.  */
mxuport_send_ctrl_data_urb(struct usb_serial * serial,u8 request,u16 value,u16 index,u8 * data,size_t size)243 static int mxuport_send_ctrl_data_urb(struct usb_serial *serial,
244 				      u8 request,
245 				      u16 value, u16 index,
246 				      u8 *data, size_t size)
247 {
248 	int status;
249 
250 	status = usb_control_msg(serial->dev,
251 				 usb_sndctrlpipe(serial->dev, 0),
252 				 request,
253 				 (USB_DIR_OUT | USB_TYPE_VENDOR |
254 				  USB_RECIP_DEVICE), value, index,
255 				 data, size,
256 				 USB_CTRL_SET_TIMEOUT);
257 	if (status < 0) {
258 		dev_err(&serial->interface->dev,
259 			"%s - usb_control_msg failed (%d)\n",
260 			__func__, status);
261 		return status;
262 	}
263 
264 	return 0;
265 }
266 
267 /* Send a vendor request without any data */
mxuport_send_ctrl_urb(struct usb_serial * serial,u8 request,u16 value,u16 index)268 static int mxuport_send_ctrl_urb(struct usb_serial *serial,
269 				 u8 request, u16 value, u16 index)
270 {
271 	return mxuport_send_ctrl_data_urb(serial, request, value, index,
272 					  NULL, 0);
273 }
274 
275 /*
276  * mxuport_throttle - throttle function of driver
277  *
278  * This function is called by the tty driver when it wants to stop the
279  * data being read from the port. Since all the data comes over one
280  * bulk in endpoint, we cannot stop submitting urbs by setting
281  * port->throttle. Instead tell the device to stop sending us data for
282  * the port.
283  */
mxuport_throttle(struct tty_struct * tty)284 static void mxuport_throttle(struct tty_struct *tty)
285 {
286 	struct usb_serial_port *port = tty->driver_data;
287 	struct usb_serial *serial = port->serial;
288 
289 	dev_dbg(&port->dev, "%s\n", __func__);
290 
291 	mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
292 			      0, port->port_number);
293 }
294 
295 /*
296  * mxuport_unthrottle - unthrottle function of driver
297  *
298  * This function is called by the tty driver when it wants to resume
299  * the data being read from the port. Tell the device it can resume
300  * sending us received data from the port.
301  */
mxuport_unthrottle(struct tty_struct * tty)302 static void mxuport_unthrottle(struct tty_struct *tty)
303 {
304 
305 	struct usb_serial_port *port = tty->driver_data;
306 	struct usb_serial *serial = port->serial;
307 
308 	dev_dbg(&port->dev, "%s\n", __func__);
309 
310 	mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
311 			      1, port->port_number);
312 }
313 
314 /*
315  * Processes one chunk of data received for a port.  Mostly a copy of
316  * usb_serial_generic_process_read_urb().
317  */
mxuport_process_read_urb_data(struct usb_serial_port * port,char * data,int size)318 static void mxuport_process_read_urb_data(struct usb_serial_port *port,
319 					  char *data, int size)
320 {
321 	int i;
322 
323 	if (port->sysrq) {
324 		for (i = 0; i < size; i++, data++) {
325 			if (!usb_serial_handle_sysrq_char(port, *data))
326 				tty_insert_flip_char(&port->port, *data,
327 						     TTY_NORMAL);
328 		}
329 	} else {
330 		tty_insert_flip_string(&port->port, data, size);
331 	}
332 	tty_flip_buffer_push(&port->port);
333 }
334 
mxuport_msr_event(struct usb_serial_port * port,u8 buf[4])335 static void mxuport_msr_event(struct usb_serial_port *port, u8 buf[4])
336 {
337 	struct mxuport_port *mxport = usb_get_serial_port_data(port);
338 	u8 rcv_msr_hold = buf[2] & 0xF0;
339 	u16 rcv_msr_event = get_unaligned_be16(buf);
340 	unsigned long flags;
341 
342 	if (rcv_msr_event == 0)
343 		return;
344 
345 	/* Update MSR status */
346 	spin_lock_irqsave(&mxport->spinlock, flags);
347 
348 	dev_dbg(&port->dev, "%s - current MSR status = 0x%x\n",
349 		__func__, mxport->msr_state);
350 
351 	if (rcv_msr_hold & UART_MSR_CTS) {
352 		mxport->msr_state |= UART_MSR_CTS;
353 		dev_dbg(&port->dev, "%s - CTS high\n", __func__);
354 	} else {
355 		mxport->msr_state &= ~UART_MSR_CTS;
356 		dev_dbg(&port->dev, "%s - CTS low\n", __func__);
357 	}
358 
359 	if (rcv_msr_hold & UART_MSR_DSR) {
360 		mxport->msr_state |= UART_MSR_DSR;
361 		dev_dbg(&port->dev, "%s - DSR high\n", __func__);
362 	} else {
363 		mxport->msr_state &= ~UART_MSR_DSR;
364 		dev_dbg(&port->dev, "%s - DSR low\n", __func__);
365 	}
366 
367 	if (rcv_msr_hold & UART_MSR_DCD) {
368 		mxport->msr_state |= UART_MSR_DCD;
369 		dev_dbg(&port->dev, "%s - DCD high\n", __func__);
370 	} else {
371 		mxport->msr_state &= ~UART_MSR_DCD;
372 		dev_dbg(&port->dev, "%s - DCD low\n", __func__);
373 	}
374 	spin_unlock_irqrestore(&mxport->spinlock, flags);
375 
376 	if (rcv_msr_event &
377 	    (SERIAL_EV_CTS | SERIAL_EV_DSR | SERIAL_EV_RLSD)) {
378 
379 		if (rcv_msr_event & SERIAL_EV_CTS) {
380 			port->icount.cts++;
381 			dev_dbg(&port->dev, "%s - CTS change\n", __func__);
382 		}
383 
384 		if (rcv_msr_event & SERIAL_EV_DSR) {
385 			port->icount.dsr++;
386 			dev_dbg(&port->dev, "%s - DSR change\n", __func__);
387 		}
388 
389 		if (rcv_msr_event & SERIAL_EV_RLSD) {
390 			port->icount.dcd++;
391 			dev_dbg(&port->dev, "%s - DCD change\n", __func__);
392 		}
393 		wake_up_interruptible(&port->port.delta_msr_wait);
394 	}
395 }
396 
mxuport_lsr_event(struct usb_serial_port * port,u8 buf[4])397 static void mxuport_lsr_event(struct usb_serial_port *port, u8 buf[4])
398 {
399 	u8 lsr_event = buf[2];
400 
401 	if (lsr_event & UART_LSR_BI) {
402 		port->icount.brk++;
403 		dev_dbg(&port->dev, "%s - break error\n", __func__);
404 	}
405 
406 	if (lsr_event & UART_LSR_FE) {
407 		port->icount.frame++;
408 		dev_dbg(&port->dev, "%s - frame error\n", __func__);
409 	}
410 
411 	if (lsr_event & UART_LSR_PE) {
412 		port->icount.parity++;
413 		dev_dbg(&port->dev, "%s - parity error\n", __func__);
414 	}
415 
416 	if (lsr_event & UART_LSR_OE) {
417 		port->icount.overrun++;
418 		dev_dbg(&port->dev, "%s - overrun error\n", __func__);
419 	}
420 }
421 
422 /*
423  * When something interesting happens, modem control lines XON/XOFF
424  * etc, the device sends an event. Process these events.
425  */
mxuport_process_read_urb_event(struct usb_serial_port * port,u8 buf[4],u32 event)426 static void mxuport_process_read_urb_event(struct usb_serial_port *port,
427 					   u8 buf[4], u32 event)
428 {
429 	dev_dbg(&port->dev, "%s - receive event : %04x\n", __func__, event);
430 
431 	switch (event) {
432 	case UPORT_EVENT_SEND_NEXT:
433 		/*
434 		 * Sent as part of the flow control on device buffers.
435 		 * Not currently used.
436 		 */
437 		break;
438 	case UPORT_EVENT_MSR:
439 		mxuport_msr_event(port, buf);
440 		break;
441 	case UPORT_EVENT_LSR:
442 		mxuport_lsr_event(port, buf);
443 		break;
444 	case UPORT_EVENT_MCR:
445 		/*
446 		 * Event to indicate a change in XON/XOFF from the
447 		 * peer.  Currently not used. We just continue
448 		 * sending the device data and it will buffer it if
449 		 * needed. This event could be used for flow control
450 		 * between the host and the device.
451 		 */
452 		break;
453 	default:
454 		dev_dbg(&port->dev, "Unexpected event\n");
455 		break;
456 	}
457 }
458 
459 /*
460  * One URB can contain data for multiple ports. Demultiplex the data,
461  * checking the port exists, is opened and the message is valid.
462  */
mxuport_process_read_urb_demux_data(struct urb * urb)463 static void mxuport_process_read_urb_demux_data(struct urb *urb)
464 {
465 	struct usb_serial_port *port = urb->context;
466 	struct usb_serial *serial = port->serial;
467 	u8 *data = urb->transfer_buffer;
468 	u8 *end = data + urb->actual_length;
469 	struct usb_serial_port *demux_port;
470 	u8 *ch;
471 	u16 rcv_port;
472 	u16 rcv_len;
473 
474 	while (data < end) {
475 		if (data + HEADER_SIZE > end) {
476 			dev_warn(&port->dev, "%s - message with short header\n",
477 				 __func__);
478 			return;
479 		}
480 
481 		rcv_port = get_unaligned_be16(data);
482 		if (rcv_port >= serial->num_ports) {
483 			dev_warn(&port->dev, "%s - message for invalid port\n",
484 				 __func__);
485 			return;
486 		}
487 
488 		demux_port = serial->port[rcv_port];
489 		rcv_len = get_unaligned_be16(data + 2);
490 		if (!rcv_len || data + HEADER_SIZE + rcv_len > end) {
491 			dev_warn(&port->dev, "%s - short data\n", __func__);
492 			return;
493 		}
494 
495 		if (tty_port_initialized(&demux_port->port)) {
496 			ch = data + HEADER_SIZE;
497 			mxuport_process_read_urb_data(demux_port, ch, rcv_len);
498 		} else {
499 			dev_dbg(&demux_port->dev, "%s - data for closed port\n",
500 				__func__);
501 		}
502 		data += HEADER_SIZE + rcv_len;
503 	}
504 }
505 
506 /*
507  * One URB can contain events for multiple ports. Demultiplex the event,
508  * checking the port exists, and is opened.
509  */
mxuport_process_read_urb_demux_event(struct urb * urb)510 static void mxuport_process_read_urb_demux_event(struct urb *urb)
511 {
512 	struct usb_serial_port *port = urb->context;
513 	struct usb_serial *serial = port->serial;
514 	u8 *data = urb->transfer_buffer;
515 	u8 *end = data + urb->actual_length;
516 	struct usb_serial_port *demux_port;
517 	u8 *ch;
518 	u16 rcv_port;
519 	u16 rcv_event;
520 
521 	while (data < end) {
522 		if (data + EVENT_LENGTH > end) {
523 			dev_warn(&port->dev, "%s - message with short event\n",
524 				 __func__);
525 			return;
526 		}
527 
528 		rcv_port = get_unaligned_be16(data);
529 		if (rcv_port >= serial->num_ports) {
530 			dev_warn(&port->dev, "%s - message for invalid port\n",
531 				 __func__);
532 			return;
533 		}
534 
535 		demux_port = serial->port[rcv_port];
536 		if (tty_port_initialized(&demux_port->port)) {
537 			ch = data + HEADER_SIZE;
538 			rcv_event = get_unaligned_be16(data + 2);
539 			mxuport_process_read_urb_event(demux_port, ch,
540 						       rcv_event);
541 		} else {
542 			dev_dbg(&demux_port->dev,
543 				"%s - event for closed port\n", __func__);
544 		}
545 		data += EVENT_LENGTH;
546 	}
547 }
548 
549 /*
550  * This is called when we have received data on the bulk in
551  * endpoint. Depending on which port it was received on, it can
552  * contain serial data or events.
553  */
mxuport_process_read_urb(struct urb * urb)554 static void mxuport_process_read_urb(struct urb *urb)
555 {
556 	struct usb_serial_port *port = urb->context;
557 	struct usb_serial *serial = port->serial;
558 
559 	if (port == serial->port[0])
560 		mxuport_process_read_urb_demux_data(urb);
561 
562 	if (port == serial->port[1])
563 		mxuport_process_read_urb_demux_event(urb);
564 }
565 
566 /*
567  * Ask the device how many bytes it has queued to be sent out. If
568  * there are none, return true.
569  */
mxuport_tx_empty(struct usb_serial_port * port)570 static bool mxuport_tx_empty(struct usb_serial_port *port)
571 {
572 	struct usb_serial *serial = port->serial;
573 	bool is_empty = true;
574 	u32 txlen;
575 	u8 *len_buf;
576 	int err;
577 
578 	len_buf = kzalloc(4, GFP_KERNEL);
579 	if (!len_buf)
580 		goto out;
581 
582 	err = mxuport_recv_ctrl_urb(serial, RQ_VENDOR_GET_OUTQUEUE, 0,
583 				    port->port_number, len_buf, 4);
584 	if (err < 0)
585 		goto out;
586 
587 	txlen = get_unaligned_be32(len_buf);
588 	dev_dbg(&port->dev, "%s - tx len = %u\n", __func__, txlen);
589 
590 	if (txlen != 0)
591 		is_empty = false;
592 
593 out:
594 	kfree(len_buf);
595 	return is_empty;
596 }
597 
mxuport_set_mcr(struct usb_serial_port * port,u8 mcr_state)598 static int mxuport_set_mcr(struct usb_serial_port *port, u8 mcr_state)
599 {
600 	struct usb_serial *serial = port->serial;
601 	int err;
602 
603 	dev_dbg(&port->dev, "%s - %02x\n", __func__, mcr_state);
604 
605 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_MCR,
606 				    mcr_state, port->port_number);
607 	if (err)
608 		dev_err(&port->dev, "%s - failed to change MCR\n", __func__);
609 
610 	return err;
611 }
612 
mxuport_set_dtr(struct usb_serial_port * port,int on)613 static int mxuport_set_dtr(struct usb_serial_port *port, int on)
614 {
615 	struct mxuport_port *mxport = usb_get_serial_port_data(port);
616 	struct usb_serial *serial = port->serial;
617 	int err;
618 
619 	mutex_lock(&mxport->mutex);
620 
621 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_DTR,
622 				    !!on, port->port_number);
623 	if (!err) {
624 		if (on)
625 			mxport->mcr_state |= UART_MCR_DTR;
626 		else
627 			mxport->mcr_state &= ~UART_MCR_DTR;
628 	}
629 
630 	mutex_unlock(&mxport->mutex);
631 
632 	return err;
633 }
634 
mxuport_set_rts(struct usb_serial_port * port,u8 state)635 static int mxuport_set_rts(struct usb_serial_port *port, u8 state)
636 {
637 	struct mxuport_port *mxport = usb_get_serial_port_data(port);
638 	struct usb_serial *serial = port->serial;
639 	int err;
640 	u8 mcr_state;
641 
642 	mutex_lock(&mxport->mutex);
643 	mcr_state = mxport->mcr_state;
644 
645 	switch (state) {
646 	case MX_RTS_DISABLE:
647 		mcr_state &= ~UART_MCR_RTS;
648 		break;
649 	case MX_RTS_ENABLE:
650 		mcr_state |= UART_MCR_RTS;
651 		break;
652 	case MX_RTS_HW:
653 		/*
654 		 * Do not update mxport->mcr_state when doing hardware
655 		 * flow control.
656 		 */
657 		break;
658 	default:
659 		/*
660 		 * Should not happen, but somebody might try passing
661 		 * MX_RTS_NO_CHANGE, which is not valid.
662 		 */
663 		err = -EINVAL;
664 		goto out;
665 	}
666 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RTS,
667 				    state, port->port_number);
668 	if (!err)
669 		mxport->mcr_state = mcr_state;
670 
671 out:
672 	mutex_unlock(&mxport->mutex);
673 
674 	return err;
675 }
676 
mxuport_dtr_rts(struct usb_serial_port * port,int on)677 static void mxuport_dtr_rts(struct usb_serial_port *port, int on)
678 {
679 	struct mxuport_port *mxport = usb_get_serial_port_data(port);
680 	u8 mcr_state;
681 	int err;
682 
683 	mutex_lock(&mxport->mutex);
684 	mcr_state = mxport->mcr_state;
685 
686 	if (on)
687 		mcr_state |= (UART_MCR_RTS | UART_MCR_DTR);
688 	else
689 		mcr_state &= ~(UART_MCR_RTS | UART_MCR_DTR);
690 
691 	err = mxuport_set_mcr(port, mcr_state);
692 	if (!err)
693 		mxport->mcr_state = mcr_state;
694 
695 	mutex_unlock(&mxport->mutex);
696 }
697 
mxuport_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)698 static int mxuport_tiocmset(struct tty_struct *tty, unsigned int set,
699 			    unsigned int clear)
700 {
701 	struct usb_serial_port *port = tty->driver_data;
702 	struct mxuport_port *mxport = usb_get_serial_port_data(port);
703 	int err;
704 	u8 mcr_state;
705 
706 	mutex_lock(&mxport->mutex);
707 	mcr_state = mxport->mcr_state;
708 
709 	if (set & TIOCM_RTS)
710 		mcr_state |= UART_MCR_RTS;
711 
712 	if (set & TIOCM_DTR)
713 		mcr_state |= UART_MCR_DTR;
714 
715 	if (clear & TIOCM_RTS)
716 		mcr_state &= ~UART_MCR_RTS;
717 
718 	if (clear & TIOCM_DTR)
719 		mcr_state &= ~UART_MCR_DTR;
720 
721 	err = mxuport_set_mcr(port, mcr_state);
722 	if (!err)
723 		mxport->mcr_state = mcr_state;
724 
725 	mutex_unlock(&mxport->mutex);
726 
727 	return err;
728 }
729 
mxuport_tiocmget(struct tty_struct * tty)730 static int mxuport_tiocmget(struct tty_struct *tty)
731 {
732 	struct mxuport_port *mxport;
733 	struct usb_serial_port *port = tty->driver_data;
734 	unsigned int result;
735 	unsigned long flags;
736 	unsigned int msr;
737 	unsigned int mcr;
738 
739 	mxport = usb_get_serial_port_data(port);
740 
741 	mutex_lock(&mxport->mutex);
742 	spin_lock_irqsave(&mxport->spinlock, flags);
743 
744 	msr = mxport->msr_state;
745 	mcr = mxport->mcr_state;
746 
747 	spin_unlock_irqrestore(&mxport->spinlock, flags);
748 	mutex_unlock(&mxport->mutex);
749 
750 	result = (((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) |	/* 0x002 */
751 		  ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) |	/* 0x004 */
752 		  ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) |	/* 0x020 */
753 		  ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) |	/* 0x040 */
754 		  ((msr & UART_MSR_RI) ? TIOCM_RI : 0) |	/* 0x080 */
755 		  ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0));	/* 0x100 */
756 
757 	dev_dbg(&port->dev, "%s - 0x%04x\n", __func__, result);
758 
759 	return result;
760 }
761 
mxuport_set_termios_flow(struct tty_struct * tty,const struct ktermios * old_termios,struct usb_serial_port * port,struct usb_serial * serial)762 static int mxuport_set_termios_flow(struct tty_struct *tty,
763 				    const struct ktermios *old_termios,
764 				    struct usb_serial_port *port,
765 				    struct usb_serial *serial)
766 {
767 	u8 xon = START_CHAR(tty);
768 	u8 xoff = STOP_CHAR(tty);
769 	int enable;
770 	int err;
771 	u8 *buf;
772 	u8 rts;
773 
774 	buf = kmalloc(2, GFP_KERNEL);
775 	if (!buf)
776 		return -ENOMEM;
777 
778 	/* S/W flow control settings */
779 	if (I_IXOFF(tty) || I_IXON(tty)) {
780 		enable = 1;
781 		buf[0] = xon;
782 		buf[1] = xoff;
783 
784 		err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_SET_CHARS,
785 						 0, port->port_number,
786 						 buf, 2);
787 		if (err)
788 			goto out;
789 
790 		dev_dbg(&port->dev, "%s - XON = 0x%02x, XOFF = 0x%02x\n",
791 			__func__, xon, xoff);
792 	} else {
793 		enable = 0;
794 	}
795 
796 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_XONXOFF,
797 				    enable, port->port_number);
798 	if (err)
799 		goto out;
800 
801 	rts = MX_RTS_NO_CHANGE;
802 
803 	/* H/W flow control settings */
804 	if (!old_termios ||
805 	    C_CRTSCTS(tty) != (old_termios->c_cflag & CRTSCTS)) {
806 		if (C_CRTSCTS(tty))
807 			rts = MX_RTS_HW;
808 		else
809 			rts = MX_RTS_ENABLE;
810 	}
811 
812 	if (C_BAUD(tty)) {
813 		if (old_termios && (old_termios->c_cflag & CBAUD) == B0) {
814 			/* Raise DTR and RTS */
815 			if (C_CRTSCTS(tty))
816 				rts = MX_RTS_HW;
817 			else
818 				rts = MX_RTS_ENABLE;
819 			mxuport_set_dtr(port, 1);
820 		}
821 	} else {
822 		/* Drop DTR and RTS */
823 		rts = MX_RTS_DISABLE;
824 		mxuport_set_dtr(port, 0);
825 	}
826 
827 	if (rts != MX_RTS_NO_CHANGE)
828 		err = mxuport_set_rts(port, rts);
829 
830 out:
831 	kfree(buf);
832 	return err;
833 }
834 
mxuport_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)835 static void mxuport_set_termios(struct tty_struct *tty,
836 				struct usb_serial_port *port,
837 				const struct ktermios *old_termios)
838 {
839 	struct usb_serial *serial = port->serial;
840 	u8 *buf;
841 	u8 data_bits;
842 	u8 stop_bits;
843 	u8 parity;
844 	int baud;
845 	int err;
846 
847 	if (old_termios &&
848 	    !tty_termios_hw_change(&tty->termios, old_termios) &&
849 	    tty->termios.c_iflag == old_termios->c_iflag) {
850 		dev_dbg(&port->dev, "%s - nothing to change\n", __func__);
851 		return;
852 	}
853 
854 	buf = kmalloc(4, GFP_KERNEL);
855 	if (!buf)
856 		return;
857 
858 	/* Set data bit of termios */
859 	switch (C_CSIZE(tty)) {
860 	case CS5:
861 		data_bits = MX_WORDLENGTH_5;
862 		break;
863 	case CS6:
864 		data_bits = MX_WORDLENGTH_6;
865 		break;
866 	case CS7:
867 		data_bits = MX_WORDLENGTH_7;
868 		break;
869 	case CS8:
870 	default:
871 		data_bits = MX_WORDLENGTH_8;
872 		break;
873 	}
874 
875 	/* Set parity of termios */
876 	if (C_PARENB(tty)) {
877 		if (C_CMSPAR(tty)) {
878 			if (C_PARODD(tty))
879 				parity = MX_PARITY_MARK;
880 			else
881 				parity = MX_PARITY_SPACE;
882 		} else {
883 			if (C_PARODD(tty))
884 				parity = MX_PARITY_ODD;
885 			else
886 				parity = MX_PARITY_EVEN;
887 		}
888 	} else {
889 		parity = MX_PARITY_NONE;
890 	}
891 
892 	/* Set stop bit of termios */
893 	if (C_CSTOPB(tty))
894 		stop_bits = MX_STOP_BITS_2;
895 	else
896 		stop_bits = MX_STOP_BITS_1;
897 
898 	buf[0] = data_bits;
899 	buf[1] = parity;
900 	buf[2] = stop_bits;
901 	buf[3] = 0;
902 
903 	err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_SET_LINE,
904 					 0, port->port_number, buf, 4);
905 	if (err)
906 		goto out;
907 
908 	err = mxuport_set_termios_flow(tty, old_termios, port, serial);
909 	if (err)
910 		goto out;
911 
912 	baud = tty_get_baud_rate(tty);
913 	if (!baud)
914 		baud = 9600;
915 
916 	/* Note: Little Endian */
917 	put_unaligned_le32(baud, buf);
918 
919 	err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_SET_BAUD,
920 					 0, port->port_number,
921 					 buf, 4);
922 	if (err)
923 		goto out;
924 
925 	dev_dbg(&port->dev, "baud_rate	: %d\n", baud);
926 	dev_dbg(&port->dev, "data_bits	: %d\n", data_bits);
927 	dev_dbg(&port->dev, "parity	: %d\n", parity);
928 	dev_dbg(&port->dev, "stop_bits	: %d\n", stop_bits);
929 
930 out:
931 	kfree(buf);
932 }
933 
934 /*
935  * Determine how many ports this device has dynamically.  It will be
936  * called after the probe() callback is called, but before attach().
937  */
mxuport_calc_num_ports(struct usb_serial * serial,struct usb_serial_endpoints * epds)938 static int mxuport_calc_num_ports(struct usb_serial *serial,
939 					struct usb_serial_endpoints *epds)
940 {
941 	unsigned long features = (unsigned long)usb_get_serial_data(serial);
942 	int num_ports;
943 	int i;
944 
945 	if (features & MX_UPORT_2_PORT) {
946 		num_ports = 2;
947 	} else if (features & MX_UPORT_4_PORT) {
948 		num_ports = 4;
949 	} else if (features & MX_UPORT_8_PORT) {
950 		num_ports = 8;
951 	} else if (features & MX_UPORT_16_PORT) {
952 		num_ports = 16;
953 	} else {
954 		dev_warn(&serial->interface->dev,
955 				"unknown device, assuming two ports\n");
956 		num_ports = 2;
957 	}
958 
959 	/*
960 	 * Setup bulk-out endpoint multiplexing. All ports share the same
961 	 * bulk-out endpoint.
962 	 */
963 	BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < 16);
964 
965 	for (i = 1; i < num_ports; ++i)
966 		epds->bulk_out[i] = epds->bulk_out[0];
967 
968 	epds->num_bulk_out = num_ports;
969 
970 	return num_ports;
971 }
972 
973 /* Get the version of the firmware currently running. */
mxuport_get_fw_version(struct usb_serial * serial,u32 * version)974 static int mxuport_get_fw_version(struct usb_serial *serial, u32 *version)
975 {
976 	u8 *ver_buf;
977 	int err;
978 
979 	ver_buf = kzalloc(4, GFP_KERNEL);
980 	if (!ver_buf)
981 		return -ENOMEM;
982 
983 	/* Get firmware version from SDRAM */
984 	err = mxuport_recv_ctrl_urb(serial, RQ_VENDOR_GET_VERSION, 0, 0,
985 				    ver_buf, 4);
986 	if (err != 4) {
987 		err = -EIO;
988 		goto out;
989 	}
990 
991 	*version = (ver_buf[0] << 16) | (ver_buf[1] << 8) | ver_buf[2];
992 	err = 0;
993 out:
994 	kfree(ver_buf);
995 	return err;
996 }
997 
998 /* Given a firmware blob, download it to the device. */
mxuport_download_fw(struct usb_serial * serial,const struct firmware * fw_p)999 static int mxuport_download_fw(struct usb_serial *serial,
1000 			       const struct firmware *fw_p)
1001 {
1002 	u8 *fw_buf;
1003 	size_t txlen;
1004 	size_t fwidx;
1005 	int err;
1006 
1007 	fw_buf = kmalloc(DOWN_BLOCK_SIZE, GFP_KERNEL);
1008 	if (!fw_buf)
1009 		return -ENOMEM;
1010 
1011 	dev_dbg(&serial->interface->dev, "Starting firmware download...\n");
1012 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_START_FW_DOWN, 0, 0);
1013 	if (err)
1014 		goto out;
1015 
1016 	fwidx = 0;
1017 	do {
1018 		txlen = min_t(size_t, (fw_p->size - fwidx), DOWN_BLOCK_SIZE);
1019 
1020 		memcpy(fw_buf, &fw_p->data[fwidx], txlen);
1021 		err = mxuport_send_ctrl_data_urb(serial, RQ_VENDOR_FW_DATA,
1022 						 0, 0, fw_buf, txlen);
1023 		if (err) {
1024 			mxuport_send_ctrl_urb(serial, RQ_VENDOR_STOP_FW_DOWN,
1025 					      0, 0);
1026 			goto out;
1027 		}
1028 
1029 		fwidx += txlen;
1030 		usleep_range(1000, 2000);
1031 
1032 	} while (fwidx < fw_p->size);
1033 
1034 	msleep(1000);
1035 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_STOP_FW_DOWN, 0, 0);
1036 	if (err)
1037 		goto out;
1038 
1039 	msleep(1000);
1040 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_QUERY_FW_READY, 0, 0);
1041 
1042 out:
1043 	kfree(fw_buf);
1044 	return err;
1045 }
1046 
mxuport_probe(struct usb_serial * serial,const struct usb_device_id * id)1047 static int mxuport_probe(struct usb_serial *serial,
1048 			 const struct usb_device_id *id)
1049 {
1050 	u16 productid = le16_to_cpu(serial->dev->descriptor.idProduct);
1051 	const struct firmware *fw_p = NULL;
1052 	u32 version;
1053 	int local_ver;
1054 	char buf[32];
1055 	int err;
1056 
1057 	/* Load our firmware */
1058 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_QUERY_FW_CONFIG, 0, 0);
1059 	if (err) {
1060 		mxuport_send_ctrl_urb(serial, RQ_VENDOR_RESET_DEVICE, 0, 0);
1061 		return err;
1062 	}
1063 
1064 	err = mxuport_get_fw_version(serial, &version);
1065 	if (err < 0)
1066 		return err;
1067 
1068 	dev_dbg(&serial->interface->dev, "Device firmware version v%x.%x.%x\n",
1069 		(version & 0xff0000) >> 16,
1070 		(version & 0xff00) >> 8,
1071 		(version & 0xff));
1072 
1073 	snprintf(buf, sizeof(buf) - 1, "moxa/moxa-%04x.fw", productid);
1074 
1075 	err = request_firmware(&fw_p, buf, &serial->interface->dev);
1076 	if (err) {
1077 		dev_warn(&serial->interface->dev, "Firmware %s not found\n",
1078 			 buf);
1079 
1080 		/* Use the firmware already in the device */
1081 		err = 0;
1082 	} else {
1083 		local_ver = ((fw_p->data[VER_ADDR_1] << 16) |
1084 			     (fw_p->data[VER_ADDR_2] << 8) |
1085 			     fw_p->data[VER_ADDR_3]);
1086 		dev_dbg(&serial->interface->dev,
1087 			"Available firmware version v%x.%x.%x\n",
1088 			fw_p->data[VER_ADDR_1], fw_p->data[VER_ADDR_2],
1089 			fw_p->data[VER_ADDR_3]);
1090 		if (local_ver > version) {
1091 			err = mxuport_download_fw(serial, fw_p);
1092 			if (err)
1093 				goto out;
1094 			err  = mxuport_get_fw_version(serial, &version);
1095 			if (err < 0)
1096 				goto out;
1097 		}
1098 	}
1099 
1100 	dev_info(&serial->interface->dev,
1101 		 "Using device firmware version v%x.%x.%x\n",
1102 		 (version & 0xff0000) >> 16,
1103 		 (version & 0xff00) >> 8,
1104 		 (version & 0xff));
1105 
1106 	/*
1107 	 * Contains the features of this hardware. Store away for
1108 	 * later use, eg, number of ports.
1109 	 */
1110 	usb_set_serial_data(serial, (void *)id->driver_info);
1111 out:
1112 	if (fw_p)
1113 		release_firmware(fw_p);
1114 	return err;
1115 }
1116 
1117 
mxuport_port_probe(struct usb_serial_port * port)1118 static int mxuport_port_probe(struct usb_serial_port *port)
1119 {
1120 	struct usb_serial *serial = port->serial;
1121 	struct mxuport_port *mxport;
1122 	int err;
1123 
1124 	mxport = devm_kzalloc(&port->dev, sizeof(struct mxuport_port),
1125 			      GFP_KERNEL);
1126 	if (!mxport)
1127 		return -ENOMEM;
1128 
1129 	mutex_init(&mxport->mutex);
1130 	spin_lock_init(&mxport->spinlock);
1131 
1132 	/* Set the port private data */
1133 	usb_set_serial_port_data(port, mxport);
1134 
1135 	/* Set FIFO (Enable) */
1136 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_FIFO_DISABLE,
1137 				    0, port->port_number);
1138 	if (err)
1139 		return err;
1140 
1141 	/* Set transmission mode (Hi-Performance) */
1142 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_HIGH_PERFOR,
1143 				    0, port->port_number);
1144 	if (err)
1145 		return err;
1146 
1147 	/* Set interface (RS-232) */
1148 	return mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_INTERFACE,
1149 				     MX_INT_RS232,
1150 				     port->port_number);
1151 }
1152 
mxuport_attach(struct usb_serial * serial)1153 static int mxuport_attach(struct usb_serial *serial)
1154 {
1155 	struct usb_serial_port *port0 = serial->port[0];
1156 	struct usb_serial_port *port1 = serial->port[1];
1157 	int err;
1158 
1159 	/*
1160 	 * All data from the ports is received on the first bulk in
1161 	 * endpoint, with a multiplex header. The second bulk in is
1162 	 * used for events.
1163 	 *
1164 	 * Start to read from the device.
1165 	 */
1166 	err = usb_serial_generic_submit_read_urbs(port0, GFP_KERNEL);
1167 	if (err)
1168 		return err;
1169 
1170 	err = usb_serial_generic_submit_read_urbs(port1, GFP_KERNEL);
1171 	if (err) {
1172 		usb_serial_generic_close(port0);
1173 		return err;
1174 	}
1175 
1176 	return 0;
1177 }
1178 
mxuport_release(struct usb_serial * serial)1179 static void mxuport_release(struct usb_serial *serial)
1180 {
1181 	struct usb_serial_port *port0 = serial->port[0];
1182 	struct usb_serial_port *port1 = serial->port[1];
1183 
1184 	usb_serial_generic_close(port1);
1185 	usb_serial_generic_close(port0);
1186 }
1187 
mxuport_open(struct tty_struct * tty,struct usb_serial_port * port)1188 static int mxuport_open(struct tty_struct *tty, struct usb_serial_port *port)
1189 {
1190 	struct mxuport_port *mxport = usb_get_serial_port_data(port);
1191 	struct usb_serial *serial = port->serial;
1192 	int err;
1193 
1194 	/* Set receive host (enable) */
1195 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
1196 				    1, port->port_number);
1197 	if (err)
1198 		return err;
1199 
1200 	err = mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_OPEN,
1201 				    1, port->port_number);
1202 	if (err) {
1203 		mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN,
1204 				      0, port->port_number);
1205 		return err;
1206 	}
1207 
1208 	/* Initial port termios */
1209 	if (tty)
1210 		mxuport_set_termios(tty, port, NULL);
1211 
1212 	/*
1213 	 * TODO: use RQ_VENDOR_GET_MSR, once we know what it
1214 	 * returns.
1215 	 */
1216 	mxport->msr_state = 0;
1217 
1218 	return err;
1219 }
1220 
mxuport_close(struct usb_serial_port * port)1221 static void mxuport_close(struct usb_serial_port *port)
1222 {
1223 	struct usb_serial *serial = port->serial;
1224 
1225 	mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_OPEN, 0,
1226 			      port->port_number);
1227 
1228 	mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_RX_HOST_EN, 0,
1229 			      port->port_number);
1230 }
1231 
1232 /* Send a break to the port. */
mxuport_break_ctl(struct tty_struct * tty,int break_state)1233 static int mxuport_break_ctl(struct tty_struct *tty, int break_state)
1234 {
1235 	struct usb_serial_port *port = tty->driver_data;
1236 	struct usb_serial *serial = port->serial;
1237 	int enable;
1238 
1239 	if (break_state == -1) {
1240 		enable = 1;
1241 		dev_dbg(&port->dev, "%s - sending break\n", __func__);
1242 	} else {
1243 		enable = 0;
1244 		dev_dbg(&port->dev, "%s - clearing break\n", __func__);
1245 	}
1246 
1247 	return mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK,
1248 				     enable, port->port_number);
1249 }
1250 
mxuport_resume(struct usb_serial * serial)1251 static int mxuport_resume(struct usb_serial *serial)
1252 {
1253 	struct usb_serial_port *port;
1254 	int c = 0;
1255 	int i;
1256 	int r;
1257 
1258 	for (i = 0; i < 2; i++) {
1259 		port = serial->port[i];
1260 
1261 		r = usb_serial_generic_submit_read_urbs(port, GFP_NOIO);
1262 		if (r < 0)
1263 			c++;
1264 	}
1265 
1266 	for (i = 0; i < serial->num_ports; i++) {
1267 		port = serial->port[i];
1268 		if (!tty_port_initialized(&port->port))
1269 			continue;
1270 
1271 		r = usb_serial_generic_write_start(port, GFP_NOIO);
1272 		if (r < 0)
1273 			c++;
1274 	}
1275 
1276 	return c ? -EIO : 0;
1277 }
1278 
1279 static struct usb_serial_driver mxuport_device = {
1280 	.driver = {
1281 		.owner =	THIS_MODULE,
1282 		.name =		"mxuport",
1283 	},
1284 	.description		= "MOXA UPort",
1285 	.id_table		= mxuport_idtable,
1286 	.num_bulk_in		= 2,
1287 	.num_bulk_out		= 1,
1288 	.probe			= mxuport_probe,
1289 	.port_probe		= mxuport_port_probe,
1290 	.attach			= mxuport_attach,
1291 	.release		= mxuport_release,
1292 	.calc_num_ports		= mxuport_calc_num_ports,
1293 	.open			= mxuport_open,
1294 	.close			= mxuport_close,
1295 	.set_termios		= mxuport_set_termios,
1296 	.break_ctl		= mxuport_break_ctl,
1297 	.tx_empty		= mxuport_tx_empty,
1298 	.tiocmiwait		= usb_serial_generic_tiocmiwait,
1299 	.get_icount		= usb_serial_generic_get_icount,
1300 	.throttle		= mxuport_throttle,
1301 	.unthrottle		= mxuport_unthrottle,
1302 	.tiocmget		= mxuport_tiocmget,
1303 	.tiocmset		= mxuport_tiocmset,
1304 	.dtr_rts		= mxuport_dtr_rts,
1305 	.process_read_urb	= mxuport_process_read_urb,
1306 	.prepare_write_buffer	= mxuport_prepare_write_buffer,
1307 	.resume			= mxuport_resume,
1308 };
1309 
1310 static struct usb_serial_driver *const serial_drivers[] = {
1311 	&mxuport_device, NULL
1312 };
1313 
1314 module_usb_serial_driver(serial_drivers, mxuport_idtable);
1315 
1316 MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
1317 MODULE_AUTHOR("<support@moxa.com>");
1318 MODULE_LICENSE("GPL");
1319