1 // SPDX-License-Identifier: GPL-2.0-only
2 /**
3 * ipoctal.c
4 *
5 * driver for the GE IP-OCTAL boards
6 *
7 * Copyright (C) 2009-2012 CERN (www.cern.ch)
8 * Author: Nicolas Serafini, EIC2 SA
9 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
10 */
11
12 #include <linux/device.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
15 #include <linux/sched.h>
16 #include <linux/tty.h>
17 #include <linux/serial.h>
18 #include <linux/tty_flip.h>
19 #include <linux/slab.h>
20 #include <linux/io.h>
21 #include <linux/ipack.h>
22 #include "ipoctal.h"
23 #include "scc2698.h"
24
25 #define IP_OCTAL_ID_SPACE_VECTOR 0x41
26 #define IP_OCTAL_NB_BLOCKS 4
27
28 static const struct tty_operations ipoctal_fops;
29
30 struct ipoctal_channel {
31 struct ipoctal_stats stats;
32 unsigned int nb_bytes;
33 wait_queue_head_t queue;
34 spinlock_t lock;
35 unsigned int pointer_read;
36 unsigned int pointer_write;
37 struct tty_port tty_port;
38 union scc2698_channel __iomem *regs;
39 union scc2698_block __iomem *block_regs;
40 unsigned int board_id;
41 u8 isr_rx_rdy_mask;
42 u8 isr_tx_rdy_mask;
43 unsigned int rx_enable;
44 };
45
46 struct ipoctal {
47 struct ipack_device *dev;
48 unsigned int board_id;
49 struct ipoctal_channel channel[NR_CHANNELS];
50 struct tty_driver *tty_drv;
51 u8 __iomem *mem8_space;
52 u8 __iomem *int_space;
53 };
54
chan_to_ipoctal(struct ipoctal_channel * chan,unsigned int index)55 static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
56 unsigned int index)
57 {
58 return container_of(chan, struct ipoctal, channel[index]);
59 }
60
ipoctal_reset_channel(struct ipoctal_channel * channel)61 static void ipoctal_reset_channel(struct ipoctal_channel *channel)
62 {
63 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
64 channel->rx_enable = 0;
65 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
66 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
67 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
68 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
69 }
70
ipoctal_port_activate(struct tty_port * port,struct tty_struct * tty)71 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
72 {
73 struct ipoctal_channel *channel;
74
75 channel = dev_get_drvdata(tty->dev);
76
77 /*
78 * Enable RX. TX will be enabled when
79 * there is something to send
80 */
81 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
82 channel->rx_enable = 1;
83 return 0;
84 }
85
ipoctal_open(struct tty_struct * tty,struct file * file)86 static int ipoctal_open(struct tty_struct *tty, struct file *file)
87 {
88 struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
89 struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
90 int err;
91
92 tty->driver_data = channel;
93
94 if (!ipack_get_carrier(ipoctal->dev))
95 return -EBUSY;
96
97 err = tty_port_open(&channel->tty_port, tty, file);
98 if (err)
99 ipack_put_carrier(ipoctal->dev);
100
101 return err;
102 }
103
ipoctal_reset_stats(struct ipoctal_stats * stats)104 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
105 {
106 stats->tx = 0;
107 stats->rx = 0;
108 stats->rcv_break = 0;
109 stats->framing_err = 0;
110 stats->overrun_err = 0;
111 stats->parity_err = 0;
112 }
113
ipoctal_free_channel(struct ipoctal_channel * channel)114 static void ipoctal_free_channel(struct ipoctal_channel *channel)
115 {
116 ipoctal_reset_stats(&channel->stats);
117 channel->pointer_read = 0;
118 channel->pointer_write = 0;
119 channel->nb_bytes = 0;
120 }
121
ipoctal_close(struct tty_struct * tty,struct file * filp)122 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
123 {
124 struct ipoctal_channel *channel = tty->driver_data;
125
126 tty_port_close(&channel->tty_port, tty, filp);
127 ipoctal_free_channel(channel);
128 }
129
ipoctal_get_icount(struct tty_struct * tty,struct serial_icounter_struct * icount)130 static int ipoctal_get_icount(struct tty_struct *tty,
131 struct serial_icounter_struct *icount)
132 {
133 struct ipoctal_channel *channel = tty->driver_data;
134
135 icount->cts = 0;
136 icount->dsr = 0;
137 icount->rng = 0;
138 icount->dcd = 0;
139 icount->rx = channel->stats.rx;
140 icount->tx = channel->stats.tx;
141 icount->frame = channel->stats.framing_err;
142 icount->parity = channel->stats.parity_err;
143 icount->brk = channel->stats.rcv_break;
144 return 0;
145 }
146
ipoctal_irq_rx(struct ipoctal_channel * channel,u8 sr)147 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
148 {
149 struct tty_port *port = &channel->tty_port;
150 unsigned char value;
151 unsigned char flag;
152 u8 isr;
153
154 do {
155 value = ioread8(&channel->regs->r.rhr);
156 flag = TTY_NORMAL;
157 /* Error: count statistics */
158 if (sr & SR_ERROR) {
159 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
160
161 if (sr & SR_OVERRUN_ERROR) {
162 channel->stats.overrun_err++;
163 /* Overrun doesn't affect the current character*/
164 tty_insert_flip_char(port, 0, TTY_OVERRUN);
165 }
166 if (sr & SR_PARITY_ERROR) {
167 channel->stats.parity_err++;
168 flag = TTY_PARITY;
169 }
170 if (sr & SR_FRAMING_ERROR) {
171 channel->stats.framing_err++;
172 flag = TTY_FRAME;
173 }
174 if (sr & SR_RECEIVED_BREAK) {
175 channel->stats.rcv_break++;
176 flag = TTY_BREAK;
177 }
178 }
179 tty_insert_flip_char(port, value, flag);
180
181 /* Check if there are more characters in RX FIFO
182 * If there are more, the isr register for this channel
183 * has enabled the RxRDY|FFULL bit.
184 */
185 isr = ioread8(&channel->block_regs->r.isr);
186 sr = ioread8(&channel->regs->r.sr);
187 } while (isr & channel->isr_rx_rdy_mask);
188
189 tty_flip_buffer_push(port);
190 }
191
ipoctal_irq_tx(struct ipoctal_channel * channel)192 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
193 {
194 unsigned char value;
195 unsigned int *pointer_write = &channel->pointer_write;
196
197 if (channel->nb_bytes == 0)
198 return;
199
200 spin_lock(&channel->lock);
201 value = channel->tty_port.xmit_buf[*pointer_write];
202 iowrite8(value, &channel->regs->w.thr);
203 channel->stats.tx++;
204 (*pointer_write)++;
205 *pointer_write = *pointer_write % PAGE_SIZE;
206 channel->nb_bytes--;
207 spin_unlock(&channel->lock);
208 }
209
ipoctal_irq_channel(struct ipoctal_channel * channel)210 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
211 {
212 u8 isr, sr;
213
214 /* The HW is organized in pair of channels. See which register we need
215 * to read from */
216 isr = ioread8(&channel->block_regs->r.isr);
217 sr = ioread8(&channel->regs->r.sr);
218
219 if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B))
220 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
221
222 if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
223 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
224 /* In case of RS-485, change from TX to RX when finishing TX.
225 * Half-duplex. */
226 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
227 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
228 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
229 channel->rx_enable = 1;
230 }
231 }
232
233 /* RX data */
234 if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
235 ipoctal_irq_rx(channel, sr);
236
237 /* TX of each character */
238 if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
239 ipoctal_irq_tx(channel);
240 }
241
ipoctal_irq_handler(void * arg)242 static irqreturn_t ipoctal_irq_handler(void *arg)
243 {
244 unsigned int i;
245 struct ipoctal *ipoctal = (struct ipoctal *) arg;
246
247 /* Clear the IPack device interrupt */
248 readw(ipoctal->int_space + ACK_INT_REQ0);
249 readw(ipoctal->int_space + ACK_INT_REQ1);
250
251 /* Check all channels */
252 for (i = 0; i < NR_CHANNELS; i++)
253 ipoctal_irq_channel(&ipoctal->channel[i]);
254
255 return IRQ_HANDLED;
256 }
257
258 static const struct tty_port_operations ipoctal_tty_port_ops = {
259 .dtr_rts = NULL,
260 .activate = ipoctal_port_activate,
261 };
262
ipoctal_inst_slot(struct ipoctal * ipoctal,unsigned int bus_nr,unsigned int slot)263 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
264 unsigned int slot)
265 {
266 int res;
267 int i;
268 struct tty_driver *tty;
269 char name[20];
270 struct ipoctal_channel *channel;
271 struct ipack_region *region;
272 void __iomem *addr;
273 union scc2698_channel __iomem *chan_regs;
274 union scc2698_block __iomem *block_regs;
275
276 ipoctal->board_id = ipoctal->dev->id_device;
277
278 region = &ipoctal->dev->region[IPACK_IO_SPACE];
279 addr = devm_ioremap_nocache(&ipoctal->dev->dev,
280 region->start, region->size);
281 if (!addr) {
282 dev_err(&ipoctal->dev->dev,
283 "Unable to map slot [%d:%d] IO space!\n",
284 bus_nr, slot);
285 return -EADDRNOTAVAIL;
286 }
287 /* Save the virtual address to access the registers easily */
288 chan_regs =
289 (union scc2698_channel __iomem *) addr;
290 block_regs =
291 (union scc2698_block __iomem *) addr;
292
293 region = &ipoctal->dev->region[IPACK_INT_SPACE];
294 ipoctal->int_space =
295 devm_ioremap_nocache(&ipoctal->dev->dev,
296 region->start, region->size);
297 if (!ipoctal->int_space) {
298 dev_err(&ipoctal->dev->dev,
299 "Unable to map slot [%d:%d] INT space!\n",
300 bus_nr, slot);
301 return -EADDRNOTAVAIL;
302 }
303
304 region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
305 ipoctal->mem8_space =
306 devm_ioremap_nocache(&ipoctal->dev->dev,
307 region->start, 0x8000);
308 if (!ipoctal->mem8_space) {
309 dev_err(&ipoctal->dev->dev,
310 "Unable to map slot [%d:%d] MEM8 space!\n",
311 bus_nr, slot);
312 return -EADDRNOTAVAIL;
313 }
314
315
316 /* Disable RX and TX before touching anything */
317 for (i = 0; i < NR_CHANNELS ; i++) {
318 struct ipoctal_channel *channel = &ipoctal->channel[i];
319 channel->regs = chan_regs + i;
320 channel->block_regs = block_regs + (i >> 1);
321 channel->board_id = ipoctal->board_id;
322 if (i & 1) {
323 channel->isr_tx_rdy_mask = ISR_TxRDY_B;
324 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
325 } else {
326 channel->isr_tx_rdy_mask = ISR_TxRDY_A;
327 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
328 }
329
330 ipoctal_reset_channel(channel);
331 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
332 &channel->regs->w.mr); /* mr1 */
333 iowrite8(0, &channel->regs->w.mr); /* mr2 */
334 iowrite8(TX_CLK_9600 | RX_CLK_9600, &channel->regs->w.csr);
335 }
336
337 for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
338 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
339 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
340 &block_regs[i].w.opcr);
341 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
342 IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
343 &block_regs[i].w.imr);
344 }
345
346 /* Dummy write */
347 iowrite8(1, ipoctal->mem8_space + 1);
348
349 /* Register the TTY device */
350
351 /* Each IP-OCTAL channel is a TTY port */
352 tty = alloc_tty_driver(NR_CHANNELS);
353
354 if (!tty)
355 return -ENOMEM;
356
357 /* Fill struct tty_driver with ipoctal data */
358 tty->owner = THIS_MODULE;
359 tty->driver_name = KBUILD_MODNAME;
360 sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
361 tty->name = name;
362 tty->major = 0;
363
364 tty->minor_start = 0;
365 tty->type = TTY_DRIVER_TYPE_SERIAL;
366 tty->subtype = SERIAL_TYPE_NORMAL;
367 tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
368 tty->init_termios = tty_std_termios;
369 tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
370 tty->init_termios.c_ispeed = 9600;
371 tty->init_termios.c_ospeed = 9600;
372
373 tty_set_operations(tty, &ipoctal_fops);
374 res = tty_register_driver(tty);
375 if (res) {
376 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
377 put_tty_driver(tty);
378 return res;
379 }
380
381 /* Save struct tty_driver for use it when uninstalling the device */
382 ipoctal->tty_drv = tty;
383
384 for (i = 0; i < NR_CHANNELS; i++) {
385 struct device *tty_dev;
386
387 channel = &ipoctal->channel[i];
388 tty_port_init(&channel->tty_port);
389 tty_port_alloc_xmit_buf(&channel->tty_port);
390 channel->tty_port.ops = &ipoctal_tty_port_ops;
391
392 ipoctal_reset_stats(&channel->stats);
393 channel->nb_bytes = 0;
394 spin_lock_init(&channel->lock);
395 channel->pointer_read = 0;
396 channel->pointer_write = 0;
397 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
398 if (IS_ERR(tty_dev)) {
399 dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
400 tty_port_destroy(&channel->tty_port);
401 continue;
402 }
403 dev_set_drvdata(tty_dev, channel);
404 }
405
406 /*
407 * IP-OCTAL has different addresses to copy its IRQ vector.
408 * Depending of the carrier these addresses are accesible or not.
409 * More info in the datasheet.
410 */
411 ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
412 ipoctal_irq_handler, ipoctal);
413
414 return 0;
415 }
416
ipoctal_copy_write_buffer(struct ipoctal_channel * channel,const unsigned char * buf,int count)417 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
418 const unsigned char *buf,
419 int count)
420 {
421 unsigned long flags;
422 int i;
423 unsigned int *pointer_read = &channel->pointer_read;
424
425 /* Copy the bytes from the user buffer to the internal one */
426 for (i = 0; i < count; i++) {
427 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
428 spin_lock_irqsave(&channel->lock, flags);
429 channel->tty_port.xmit_buf[*pointer_read] = buf[i];
430 *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
431 channel->nb_bytes++;
432 spin_unlock_irqrestore(&channel->lock, flags);
433 } else {
434 break;
435 }
436 }
437 return i;
438 }
439
ipoctal_write_tty(struct tty_struct * tty,const unsigned char * buf,int count)440 static int ipoctal_write_tty(struct tty_struct *tty,
441 const unsigned char *buf, int count)
442 {
443 struct ipoctal_channel *channel = tty->driver_data;
444 unsigned int char_copied;
445
446 char_copied = ipoctal_copy_write_buffer(channel, buf, count);
447
448 /* As the IP-OCTAL 485 only supports half duplex, do it manually */
449 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
450 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
451 channel->rx_enable = 0;
452 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
453 }
454
455 /*
456 * Send a packet and then disable TX to avoid failure after several send
457 * operations
458 */
459 iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
460 return char_copied;
461 }
462
ipoctal_write_room(struct tty_struct * tty)463 static int ipoctal_write_room(struct tty_struct *tty)
464 {
465 struct ipoctal_channel *channel = tty->driver_data;
466
467 return PAGE_SIZE - channel->nb_bytes;
468 }
469
ipoctal_chars_in_buffer(struct tty_struct * tty)470 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
471 {
472 struct ipoctal_channel *channel = tty->driver_data;
473
474 return channel->nb_bytes;
475 }
476
ipoctal_set_termios(struct tty_struct * tty,struct ktermios * old_termios)477 static void ipoctal_set_termios(struct tty_struct *tty,
478 struct ktermios *old_termios)
479 {
480 unsigned int cflag;
481 unsigned char mr1 = 0;
482 unsigned char mr2 = 0;
483 unsigned char csr = 0;
484 struct ipoctal_channel *channel = tty->driver_data;
485 speed_t baud;
486
487 cflag = tty->termios.c_cflag;
488
489 /* Disable and reset everything before change the setup */
490 ipoctal_reset_channel(channel);
491
492 /* Set Bits per chars */
493 switch (cflag & CSIZE) {
494 case CS6:
495 mr1 |= MR1_CHRL_6_BITS;
496 break;
497 case CS7:
498 mr1 |= MR1_CHRL_7_BITS;
499 break;
500 case CS8:
501 default:
502 mr1 |= MR1_CHRL_8_BITS;
503 /* By default, select CS8 */
504 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
505 break;
506 }
507
508 /* Set Parity */
509 if (cflag & PARENB)
510 if (cflag & PARODD)
511 mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
512 else
513 mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
514 else
515 mr1 |= MR1_PARITY_OFF;
516
517 /* Mark or space parity is not supported */
518 tty->termios.c_cflag &= ~CMSPAR;
519
520 /* Set stop bits */
521 if (cflag & CSTOPB)
522 mr2 |= MR2_STOP_BITS_LENGTH_2;
523 else
524 mr2 |= MR2_STOP_BITS_LENGTH_1;
525
526 /* Set the flow control */
527 switch (channel->board_id) {
528 case IPACK1_DEVICE_ID_SBS_OCTAL_232:
529 if (cflag & CRTSCTS) {
530 mr1 |= MR1_RxRTS_CONTROL_ON;
531 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
532 } else {
533 mr1 |= MR1_RxRTS_CONTROL_OFF;
534 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
535 }
536 break;
537 case IPACK1_DEVICE_ID_SBS_OCTAL_422:
538 mr1 |= MR1_RxRTS_CONTROL_OFF;
539 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
540 break;
541 case IPACK1_DEVICE_ID_SBS_OCTAL_485:
542 mr1 |= MR1_RxRTS_CONTROL_OFF;
543 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
544 break;
545 default:
546 return;
547 break;
548 }
549
550 baud = tty_get_baud_rate(tty);
551 tty_termios_encode_baud_rate(&tty->termios, baud, baud);
552
553 /* Set baud rate */
554 switch (baud) {
555 case 75:
556 csr |= TX_CLK_75 | RX_CLK_75;
557 break;
558 case 110:
559 csr |= TX_CLK_110 | RX_CLK_110;
560 break;
561 case 150:
562 csr |= TX_CLK_150 | RX_CLK_150;
563 break;
564 case 300:
565 csr |= TX_CLK_300 | RX_CLK_300;
566 break;
567 case 600:
568 csr |= TX_CLK_600 | RX_CLK_600;
569 break;
570 case 1200:
571 csr |= TX_CLK_1200 | RX_CLK_1200;
572 break;
573 case 1800:
574 csr |= TX_CLK_1800 | RX_CLK_1800;
575 break;
576 case 2000:
577 csr |= TX_CLK_2000 | RX_CLK_2000;
578 break;
579 case 2400:
580 csr |= TX_CLK_2400 | RX_CLK_2400;
581 break;
582 case 4800:
583 csr |= TX_CLK_4800 | RX_CLK_4800;
584 break;
585 case 9600:
586 csr |= TX_CLK_9600 | RX_CLK_9600;
587 break;
588 case 19200:
589 csr |= TX_CLK_19200 | RX_CLK_19200;
590 break;
591 case 38400:
592 default:
593 csr |= TX_CLK_38400 | RX_CLK_38400;
594 /* In case of default, we establish 38400 bps */
595 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
596 break;
597 }
598
599 mr1 |= MR1_ERROR_CHAR;
600 mr1 |= MR1_RxINT_RxRDY;
601
602 /* Write the control registers */
603 iowrite8(mr1, &channel->regs->w.mr);
604 iowrite8(mr2, &channel->regs->w.mr);
605 iowrite8(csr, &channel->regs->w.csr);
606
607 /* Enable again the RX, if it was before */
608 if (channel->rx_enable)
609 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
610 }
611
ipoctal_hangup(struct tty_struct * tty)612 static void ipoctal_hangup(struct tty_struct *tty)
613 {
614 unsigned long flags;
615 struct ipoctal_channel *channel = tty->driver_data;
616
617 if (channel == NULL)
618 return;
619
620 spin_lock_irqsave(&channel->lock, flags);
621 channel->nb_bytes = 0;
622 channel->pointer_read = 0;
623 channel->pointer_write = 0;
624 spin_unlock_irqrestore(&channel->lock, flags);
625
626 tty_port_hangup(&channel->tty_port);
627
628 ipoctal_reset_channel(channel);
629 tty_port_set_initialized(&channel->tty_port, 0);
630 wake_up_interruptible(&channel->tty_port.open_wait);
631 }
632
ipoctal_shutdown(struct tty_struct * tty)633 static void ipoctal_shutdown(struct tty_struct *tty)
634 {
635 struct ipoctal_channel *channel = tty->driver_data;
636
637 if (channel == NULL)
638 return;
639
640 ipoctal_reset_channel(channel);
641 tty_port_set_initialized(&channel->tty_port, 0);
642 }
643
ipoctal_cleanup(struct tty_struct * tty)644 static void ipoctal_cleanup(struct tty_struct *tty)
645 {
646 struct ipoctal_channel *channel = tty->driver_data;
647 struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
648
649 /* release the carrier driver */
650 ipack_put_carrier(ipoctal->dev);
651 }
652
653 static const struct tty_operations ipoctal_fops = {
654 .ioctl = NULL,
655 .open = ipoctal_open,
656 .close = ipoctal_close,
657 .write = ipoctal_write_tty,
658 .set_termios = ipoctal_set_termios,
659 .write_room = ipoctal_write_room,
660 .chars_in_buffer = ipoctal_chars_in_buffer,
661 .get_icount = ipoctal_get_icount,
662 .hangup = ipoctal_hangup,
663 .shutdown = ipoctal_shutdown,
664 .cleanup = ipoctal_cleanup,
665 };
666
ipoctal_probe(struct ipack_device * dev)667 static int ipoctal_probe(struct ipack_device *dev)
668 {
669 int res;
670 struct ipoctal *ipoctal;
671
672 ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
673 if (ipoctal == NULL)
674 return -ENOMEM;
675
676 ipoctal->dev = dev;
677 res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
678 if (res)
679 goto out_uninst;
680
681 dev_set_drvdata(&dev->dev, ipoctal);
682 return 0;
683
684 out_uninst:
685 kfree(ipoctal);
686 return res;
687 }
688
__ipoctal_remove(struct ipoctal * ipoctal)689 static void __ipoctal_remove(struct ipoctal *ipoctal)
690 {
691 int i;
692
693 ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
694
695 for (i = 0; i < NR_CHANNELS; i++) {
696 struct ipoctal_channel *channel = &ipoctal->channel[i];
697 tty_unregister_device(ipoctal->tty_drv, i);
698 tty_port_free_xmit_buf(&channel->tty_port);
699 tty_port_destroy(&channel->tty_port);
700 }
701
702 tty_unregister_driver(ipoctal->tty_drv);
703 put_tty_driver(ipoctal->tty_drv);
704 kfree(ipoctal);
705 }
706
ipoctal_remove(struct ipack_device * idev)707 static void ipoctal_remove(struct ipack_device *idev)
708 {
709 __ipoctal_remove(dev_get_drvdata(&idev->dev));
710 }
711
712 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
713 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
714 IPACK1_DEVICE_ID_SBS_OCTAL_232) },
715 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
716 IPACK1_DEVICE_ID_SBS_OCTAL_422) },
717 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
718 IPACK1_DEVICE_ID_SBS_OCTAL_485) },
719 { 0, },
720 };
721
722 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
723
724 static const struct ipack_driver_ops ipoctal_drv_ops = {
725 .probe = ipoctal_probe,
726 .remove = ipoctal_remove,
727 };
728
729 static struct ipack_driver driver = {
730 .ops = &ipoctal_drv_ops,
731 .id_table = ipoctal_ids,
732 };
733
ipoctal_init(void)734 static int __init ipoctal_init(void)
735 {
736 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
737 }
738
ipoctal_exit(void)739 static void __exit ipoctal_exit(void)
740 {
741 ipack_driver_unregister(&driver);
742 }
743
744 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
745 MODULE_LICENSE("GPL");
746
747 module_init(ipoctal_init);
748 module_exit(ipoctal_exit);
749
