Linux 5.16-rc3
[muen/linux.git] / drivers / ipack / devices / ipoctal.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * driver for the GE IP-OCTAL boards
4  *
5  * Copyright (C) 2009-2012 CERN (www.cern.ch)
6  * Author: Nicolas Serafini, EIC2 SA
7  * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
8  */
9
10 #include <linux/device.h>
11 #include <linux/module.h>
12 #include <linux/interrupt.h>
13 #include <linux/sched.h>
14 #include <linux/tty.h>
15 #include <linux/serial.h>
16 #include <linux/tty_flip.h>
17 #include <linux/slab.h>
18 #include <linux/io.h>
19 #include <linux/ipack.h>
20 #include "ipoctal.h"
21 #include "scc2698.h"
22
23 #define IP_OCTAL_ID_SPACE_VECTOR    0x41
24 #define IP_OCTAL_NB_BLOCKS          4
25
26 static const struct tty_operations ipoctal_fops;
27
28 struct ipoctal_channel {
29         struct ipoctal_stats            stats;
30         unsigned int                    nb_bytes;
31         wait_queue_head_t               queue;
32         spinlock_t                      lock;
33         unsigned int                    pointer_read;
34         unsigned int                    pointer_write;
35         struct tty_port                 tty_port;
36         bool                            tty_registered;
37         union scc2698_channel __iomem   *regs;
38         union scc2698_block __iomem     *block_regs;
39         unsigned int                    board_id;
40         u8                              isr_rx_rdy_mask;
41         u8                              isr_tx_rdy_mask;
42         unsigned int                    rx_enable;
43 };
44
45 struct ipoctal {
46         struct ipack_device             *dev;
47         unsigned int                    board_id;
48         struct ipoctal_channel          channel[NR_CHANNELS];
49         struct tty_driver               *tty_drv;
50         u8 __iomem                      *mem8_space;
51         u8 __iomem                      *int_space;
52 };
53
54 static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
55                                               unsigned int index)
56 {
57         return container_of(chan, struct ipoctal, channel[index]);
58 }
59
60 static void ipoctal_reset_channel(struct ipoctal_channel *channel)
61 {
62         iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
63         channel->rx_enable = 0;
64         iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
65         iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
66         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
67         iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
68 }
69
70 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
71 {
72         struct ipoctal_channel *channel;
73
74         channel = dev_get_drvdata(tty->dev);
75
76         /*
77          * Enable RX. TX will be enabled when
78          * there is something to send
79          */
80         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
81         channel->rx_enable = 1;
82         return 0;
83 }
84
85 static int ipoctal_install(struct tty_driver *driver, struct tty_struct *tty)
86 {
87         struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
88         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
89         int res;
90
91         if (!ipack_get_carrier(ipoctal->dev))
92                 return -EBUSY;
93
94         res = tty_standard_install(driver, tty);
95         if (res)
96                 goto err_put_carrier;
97
98         tty->driver_data = channel;
99
100         return 0;
101
102 err_put_carrier:
103         ipack_put_carrier(ipoctal->dev);
104
105         return res;
106 }
107
108 static int ipoctal_open(struct tty_struct *tty, struct file *file)
109 {
110         struct ipoctal_channel *channel = tty->driver_data;
111
112         return tty_port_open(&channel->tty_port, tty, file);
113 }
114
115 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
116 {
117         stats->tx = 0;
118         stats->rx = 0;
119         stats->rcv_break = 0;
120         stats->framing_err = 0;
121         stats->overrun_err = 0;
122         stats->parity_err = 0;
123 }
124
125 static void ipoctal_free_channel(struct ipoctal_channel *channel)
126 {
127         ipoctal_reset_stats(&channel->stats);
128         channel->pointer_read = 0;
129         channel->pointer_write = 0;
130         channel->nb_bytes = 0;
131 }
132
133 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
134 {
135         struct ipoctal_channel *channel = tty->driver_data;
136
137         tty_port_close(&channel->tty_port, tty, filp);
138         ipoctal_free_channel(channel);
139 }
140
141 static int ipoctal_get_icount(struct tty_struct *tty,
142                               struct serial_icounter_struct *icount)
143 {
144         struct ipoctal_channel *channel = tty->driver_data;
145
146         icount->cts = 0;
147         icount->dsr = 0;
148         icount->rng = 0;
149         icount->dcd = 0;
150         icount->rx = channel->stats.rx;
151         icount->tx = channel->stats.tx;
152         icount->frame = channel->stats.framing_err;
153         icount->parity = channel->stats.parity_err;
154         icount->brk = channel->stats.rcv_break;
155         return 0;
156 }
157
158 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
159 {
160         struct tty_port *port = &channel->tty_port;
161         unsigned char value;
162         unsigned char flag;
163         u8 isr;
164
165         do {
166                 value = ioread8(&channel->regs->r.rhr);
167                 flag = TTY_NORMAL;
168                 /* Error: count statistics */
169                 if (sr & SR_ERROR) {
170                         iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
171
172                         if (sr & SR_OVERRUN_ERROR) {
173                                 channel->stats.overrun_err++;
174                                 /* Overrun doesn't affect the current character*/
175                                 tty_insert_flip_char(port, 0, TTY_OVERRUN);
176                         }
177                         if (sr & SR_PARITY_ERROR) {
178                                 channel->stats.parity_err++;
179                                 flag = TTY_PARITY;
180                         }
181                         if (sr & SR_FRAMING_ERROR) {
182                                 channel->stats.framing_err++;
183                                 flag = TTY_FRAME;
184                         }
185                         if (sr & SR_RECEIVED_BREAK) {
186                                 channel->stats.rcv_break++;
187                                 flag = TTY_BREAK;
188                         }
189                 }
190                 tty_insert_flip_char(port, value, flag);
191
192                 /* Check if there are more characters in RX FIFO
193                  * If there are more, the isr register for this channel
194                  * has enabled the RxRDY|FFULL bit.
195                  */
196                 isr = ioread8(&channel->block_regs->r.isr);
197                 sr = ioread8(&channel->regs->r.sr);
198         } while (isr & channel->isr_rx_rdy_mask);
199
200         tty_flip_buffer_push(port);
201 }
202
203 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
204 {
205         unsigned char value;
206         unsigned int *pointer_write = &channel->pointer_write;
207
208         if (channel->nb_bytes == 0)
209                 return;
210
211         spin_lock(&channel->lock);
212         value = channel->tty_port.xmit_buf[*pointer_write];
213         iowrite8(value, &channel->regs->w.thr);
214         channel->stats.tx++;
215         (*pointer_write)++;
216         *pointer_write = *pointer_write % PAGE_SIZE;
217         channel->nb_bytes--;
218         spin_unlock(&channel->lock);
219 }
220
221 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
222 {
223         u8 isr, sr;
224
225         /* The HW is organized in pair of channels.  See which register we need
226          * to read from */
227         isr = ioread8(&channel->block_regs->r.isr);
228         sr = ioread8(&channel->regs->r.sr);
229
230         if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B))
231                 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
232
233         if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
234                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
235                 /* In case of RS-485, change from TX to RX when finishing TX.
236                  * Half-duplex. */
237                 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
238                         iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
239                         iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
240                         channel->rx_enable = 1;
241                 }
242         }
243
244         /* RX data */
245         if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
246                 ipoctal_irq_rx(channel, sr);
247
248         /* TX of each character */
249         if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
250                 ipoctal_irq_tx(channel);
251 }
252
253 static irqreturn_t ipoctal_irq_handler(void *arg)
254 {
255         unsigned int i;
256         struct ipoctal *ipoctal = (struct ipoctal *) arg;
257
258         /* Clear the IPack device interrupt */
259         readw(ipoctal->int_space + ACK_INT_REQ0);
260         readw(ipoctal->int_space + ACK_INT_REQ1);
261
262         /* Check all channels */
263         for (i = 0; i < NR_CHANNELS; i++)
264                 ipoctal_irq_channel(&ipoctal->channel[i]);
265
266         return IRQ_HANDLED;
267 }
268
269 static const struct tty_port_operations ipoctal_tty_port_ops = {
270         .dtr_rts = NULL,
271         .activate = ipoctal_port_activate,
272 };
273
274 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
275                              unsigned int slot)
276 {
277         int res;
278         int i;
279         struct tty_driver *tty;
280         struct ipoctal_channel *channel;
281         struct ipack_region *region;
282         void __iomem *addr;
283         union scc2698_channel __iomem *chan_regs;
284         union scc2698_block __iomem *block_regs;
285
286         ipoctal->board_id = ipoctal->dev->id_device;
287
288         region = &ipoctal->dev->region[IPACK_IO_SPACE];
289         addr = devm_ioremap(&ipoctal->dev->dev,
290                                     region->start, region->size);
291         if (!addr) {
292                 dev_err(&ipoctal->dev->dev,
293                         "Unable to map slot [%d:%d] IO space!\n",
294                         bus_nr, slot);
295                 return -EADDRNOTAVAIL;
296         }
297         /* Save the virtual address to access the registers easily */
298         chan_regs =
299                 (union scc2698_channel __iomem *) addr;
300         block_regs =
301                 (union scc2698_block __iomem *) addr;
302
303         region = &ipoctal->dev->region[IPACK_INT_SPACE];
304         ipoctal->int_space =
305                 devm_ioremap(&ipoctal->dev->dev,
306                                      region->start, region->size);
307         if (!ipoctal->int_space) {
308                 dev_err(&ipoctal->dev->dev,
309                         "Unable to map slot [%d:%d] INT space!\n",
310                         bus_nr, slot);
311                 return -EADDRNOTAVAIL;
312         }
313
314         region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
315         ipoctal->mem8_space =
316                 devm_ioremap(&ipoctal->dev->dev,
317                                      region->start, 0x8000);
318         if (!ipoctal->mem8_space) {
319                 dev_err(&ipoctal->dev->dev,
320                         "Unable to map slot [%d:%d] MEM8 space!\n",
321                         bus_nr, slot);
322                 return -EADDRNOTAVAIL;
323         }
324
325
326         /* Disable RX and TX before touching anything */
327         for (i = 0; i < NR_CHANNELS ; i++) {
328                 struct ipoctal_channel *channel = &ipoctal->channel[i];
329                 channel->regs = chan_regs + i;
330                 channel->block_regs = block_regs + (i >> 1);
331                 channel->board_id = ipoctal->board_id;
332                 if (i & 1) {
333                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
334                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
335                 } else {
336                         channel->isr_tx_rdy_mask = ISR_TxRDY_A;
337                         channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
338                 }
339
340                 ipoctal_reset_channel(channel);
341                 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
342                          &channel->regs->w.mr); /* mr1 */
343                 iowrite8(0, &channel->regs->w.mr); /* mr2 */
344                 iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
345         }
346
347         for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
348                 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
349                 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
350                          &block_regs[i].w.opcr);
351                 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
352                          IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
353                          &block_regs[i].w.imr);
354         }
355
356         /* Dummy write */
357         iowrite8(1, ipoctal->mem8_space + 1);
358
359         /* Register the TTY device */
360
361         /* Each IP-OCTAL channel is a TTY port */
362         tty = tty_alloc_driver(NR_CHANNELS, TTY_DRIVER_REAL_RAW |
363                         TTY_DRIVER_DYNAMIC_DEV);
364         if (IS_ERR(tty))
365                 return PTR_ERR(tty);
366
367         /* Fill struct tty_driver with ipoctal data */
368         tty->owner = THIS_MODULE;
369         tty->driver_name = KBUILD_MODNAME;
370         tty->name = kasprintf(GFP_KERNEL, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
371         if (!tty->name) {
372                 res = -ENOMEM;
373                 goto err_put_driver;
374         }
375         tty->major = 0;
376
377         tty->minor_start = 0;
378         tty->type = TTY_DRIVER_TYPE_SERIAL;
379         tty->subtype = SERIAL_TYPE_NORMAL;
380         tty->init_termios = tty_std_termios;
381         tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
382         tty->init_termios.c_ispeed = 9600;
383         tty->init_termios.c_ospeed = 9600;
384
385         tty_set_operations(tty, &ipoctal_fops);
386         res = tty_register_driver(tty);
387         if (res) {
388                 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
389                 goto err_free_name;
390         }
391
392         /* Save struct tty_driver for use it when uninstalling the device */
393         ipoctal->tty_drv = tty;
394
395         for (i = 0; i < NR_CHANNELS; i++) {
396                 struct device *tty_dev;
397
398                 channel = &ipoctal->channel[i];
399                 tty_port_init(&channel->tty_port);
400                 res = tty_port_alloc_xmit_buf(&channel->tty_port);
401                 if (res)
402                         continue;
403                 channel->tty_port.ops = &ipoctal_tty_port_ops;
404
405                 ipoctal_reset_stats(&channel->stats);
406                 channel->nb_bytes = 0;
407                 spin_lock_init(&channel->lock);
408                 channel->pointer_read = 0;
409                 channel->pointer_write = 0;
410                 tty_dev = tty_port_register_device_attr(&channel->tty_port, tty,
411                                                         i, NULL, channel, NULL);
412                 if (IS_ERR(tty_dev)) {
413                         dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
414                         tty_port_free_xmit_buf(&channel->tty_port);
415                         tty_port_destroy(&channel->tty_port);
416                         continue;
417                 }
418                 channel->tty_registered = true;
419         }
420
421         /*
422          * IP-OCTAL has different addresses to copy its IRQ vector.
423          * Depending of the carrier these addresses are accesible or not.
424          * More info in the datasheet.
425          */
426         ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
427                                        ipoctal_irq_handler, ipoctal);
428
429         return 0;
430
431 err_free_name:
432         kfree(tty->name);
433 err_put_driver:
434         tty_driver_kref_put(tty);
435
436         return res;
437 }
438
439 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
440                                             const unsigned char *buf,
441                                             int count)
442 {
443         unsigned long flags;
444         int i;
445         unsigned int *pointer_read = &channel->pointer_read;
446
447         /* Copy the bytes from the user buffer to the internal one */
448         for (i = 0; i < count; i++) {
449                 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
450                         spin_lock_irqsave(&channel->lock, flags);
451                         channel->tty_port.xmit_buf[*pointer_read] = buf[i];
452                         *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
453                         channel->nb_bytes++;
454                         spin_unlock_irqrestore(&channel->lock, flags);
455                 } else {
456                         break;
457                 }
458         }
459         return i;
460 }
461
462 static int ipoctal_write_tty(struct tty_struct *tty,
463                              const unsigned char *buf, int count)
464 {
465         struct ipoctal_channel *channel = tty->driver_data;
466         unsigned int char_copied;
467
468         char_copied = ipoctal_copy_write_buffer(channel, buf, count);
469
470         /* As the IP-OCTAL 485 only supports half duplex, do it manually */
471         if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
472                 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
473                 channel->rx_enable = 0;
474                 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
475         }
476
477         /*
478          * Send a packet and then disable TX to avoid failure after several send
479          * operations
480          */
481         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
482         return char_copied;
483 }
484
485 static unsigned int ipoctal_write_room(struct tty_struct *tty)
486 {
487         struct ipoctal_channel *channel = tty->driver_data;
488
489         return PAGE_SIZE - channel->nb_bytes;
490 }
491
492 static unsigned int ipoctal_chars_in_buffer(struct tty_struct *tty)
493 {
494         struct ipoctal_channel *channel = tty->driver_data;
495
496         return channel->nb_bytes;
497 }
498
499 static void ipoctal_set_termios(struct tty_struct *tty,
500                                 struct ktermios *old_termios)
501 {
502         unsigned int cflag;
503         unsigned char mr1 = 0;
504         unsigned char mr2 = 0;
505         unsigned char csr = 0;
506         struct ipoctal_channel *channel = tty->driver_data;
507         speed_t baud;
508
509         cflag = tty->termios.c_cflag;
510
511         /* Disable and reset everything before change the setup */
512         ipoctal_reset_channel(channel);
513
514         /* Set Bits per chars */
515         switch (cflag & CSIZE) {
516         case CS6:
517                 mr1 |= MR1_CHRL_6_BITS;
518                 break;
519         case CS7:
520                 mr1 |= MR1_CHRL_7_BITS;
521                 break;
522         case CS8:
523         default:
524                 mr1 |= MR1_CHRL_8_BITS;
525                 /* By default, select CS8 */
526                 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
527                 break;
528         }
529
530         /* Set Parity */
531         if (cflag & PARENB)
532                 if (cflag & PARODD)
533                         mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
534                 else
535                         mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
536         else
537                 mr1 |= MR1_PARITY_OFF;
538
539         /* Mark or space parity is not supported */
540         tty->termios.c_cflag &= ~CMSPAR;
541
542         /* Set stop bits */
543         if (cflag & CSTOPB)
544                 mr2 |= MR2_STOP_BITS_LENGTH_2;
545         else
546                 mr2 |= MR2_STOP_BITS_LENGTH_1;
547
548         /* Set the flow control */
549         switch (channel->board_id) {
550         case IPACK1_DEVICE_ID_SBS_OCTAL_232:
551                 if (cflag & CRTSCTS) {
552                         mr1 |= MR1_RxRTS_CONTROL_ON;
553                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
554                 } else {
555                         mr1 |= MR1_RxRTS_CONTROL_OFF;
556                         mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
557                 }
558                 break;
559         case IPACK1_DEVICE_ID_SBS_OCTAL_422:
560                 mr1 |= MR1_RxRTS_CONTROL_OFF;
561                 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
562                 break;
563         case IPACK1_DEVICE_ID_SBS_OCTAL_485:
564                 mr1 |= MR1_RxRTS_CONTROL_OFF;
565                 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
566                 break;
567         default:
568                 return;
569         }
570
571         baud = tty_get_baud_rate(tty);
572         tty_termios_encode_baud_rate(&tty->termios, baud, baud);
573
574         /* Set baud rate */
575         switch (baud) {
576         case 75:
577                 csr |= TX_CLK_75 | RX_CLK_75;
578                 break;
579         case 110:
580                 csr |= TX_CLK_110 | RX_CLK_110;
581                 break;
582         case 150:
583                 csr |= TX_CLK_150 | RX_CLK_150;
584                 break;
585         case 300:
586                 csr |= TX_CLK_300 | RX_CLK_300;
587                 break;
588         case 600:
589                 csr |= TX_CLK_600 | RX_CLK_600;
590                 break;
591         case 1200:
592                 csr |= TX_CLK_1200 | RX_CLK_1200;
593                 break;
594         case 1800:
595                 csr |= TX_CLK_1800 | RX_CLK_1800;
596                 break;
597         case 2000:
598                 csr |= TX_CLK_2000 | RX_CLK_2000;
599                 break;
600         case 2400:
601                 csr |= TX_CLK_2400 | RX_CLK_2400;
602                 break;
603         case 4800:
604                 csr |= TX_CLK_4800  | RX_CLK_4800;
605                 break;
606         case 9600:
607                 csr |= TX_CLK_9600  | RX_CLK_9600;
608                 break;
609         case 19200:
610                 csr |= TX_CLK_19200 | RX_CLK_19200;
611                 break;
612         case 38400:
613         default:
614                 csr |= TX_CLK_38400 | RX_CLK_38400;
615                 /* In case of default, we establish 38400 bps */
616                 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
617                 break;
618         }
619
620         mr1 |= MR1_ERROR_CHAR;
621         mr1 |= MR1_RxINT_RxRDY;
622
623         /* Write the control registers */
624         iowrite8(mr1, &channel->regs->w.mr);
625         iowrite8(mr2, &channel->regs->w.mr);
626         iowrite8(csr, &channel->regs->w.csr);
627
628         /* Enable again the RX, if it was before */
629         if (channel->rx_enable)
630                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
631 }
632
633 static void ipoctal_hangup(struct tty_struct *tty)
634 {
635         unsigned long flags;
636         struct ipoctal_channel *channel = tty->driver_data;
637
638         if (channel == NULL)
639                 return;
640
641         spin_lock_irqsave(&channel->lock, flags);
642         channel->nb_bytes = 0;
643         channel->pointer_read = 0;
644         channel->pointer_write = 0;
645         spin_unlock_irqrestore(&channel->lock, flags);
646
647         tty_port_hangup(&channel->tty_port);
648
649         ipoctal_reset_channel(channel);
650         tty_port_set_initialized(&channel->tty_port, 0);
651         wake_up_interruptible(&channel->tty_port.open_wait);
652 }
653
654 static void ipoctal_shutdown(struct tty_struct *tty)
655 {
656         struct ipoctal_channel *channel = tty->driver_data;
657
658         if (channel == NULL)
659                 return;
660
661         ipoctal_reset_channel(channel);
662         tty_port_set_initialized(&channel->tty_port, 0);
663 }
664
665 static void ipoctal_cleanup(struct tty_struct *tty)
666 {
667         struct ipoctal_channel *channel = tty->driver_data;
668         struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
669
670         /* release the carrier driver */
671         ipack_put_carrier(ipoctal->dev);
672 }
673
674 static const struct tty_operations ipoctal_fops = {
675         .ioctl =                NULL,
676         .install =              ipoctal_install,
677         .open =                 ipoctal_open,
678         .close =                ipoctal_close,
679         .write =                ipoctal_write_tty,
680         .set_termios =          ipoctal_set_termios,
681         .write_room =           ipoctal_write_room,
682         .chars_in_buffer =      ipoctal_chars_in_buffer,
683         .get_icount =           ipoctal_get_icount,
684         .hangup =               ipoctal_hangup,
685         .shutdown =             ipoctal_shutdown,
686         .cleanup =              ipoctal_cleanup,
687 };
688
689 static int ipoctal_probe(struct ipack_device *dev)
690 {
691         int res;
692         struct ipoctal *ipoctal;
693
694         ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
695         if (ipoctal == NULL)
696                 return -ENOMEM;
697
698         ipoctal->dev = dev;
699         res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
700         if (res)
701                 goto out_uninst;
702
703         dev_set_drvdata(&dev->dev, ipoctal);
704         return 0;
705
706 out_uninst:
707         kfree(ipoctal);
708         return res;
709 }
710
711 static void __ipoctal_remove(struct ipoctal *ipoctal)
712 {
713         int i;
714
715         ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
716
717         for (i = 0; i < NR_CHANNELS; i++) {
718                 struct ipoctal_channel *channel = &ipoctal->channel[i];
719
720                 if (!channel->tty_registered)
721                         continue;
722
723                 tty_unregister_device(ipoctal->tty_drv, i);
724                 tty_port_free_xmit_buf(&channel->tty_port);
725                 tty_port_destroy(&channel->tty_port);
726         }
727
728         tty_unregister_driver(ipoctal->tty_drv);
729         kfree(ipoctal->tty_drv->name);
730         tty_driver_kref_put(ipoctal->tty_drv);
731         kfree(ipoctal);
732 }
733
734 static void ipoctal_remove(struct ipack_device *idev)
735 {
736         __ipoctal_remove(dev_get_drvdata(&idev->dev));
737 }
738
739 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
740         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
741                         IPACK1_DEVICE_ID_SBS_OCTAL_232) },
742         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
743                         IPACK1_DEVICE_ID_SBS_OCTAL_422) },
744         { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
745                         IPACK1_DEVICE_ID_SBS_OCTAL_485) },
746         { 0, },
747 };
748
749 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
750
751 static const struct ipack_driver_ops ipoctal_drv_ops = {
752         .probe  = ipoctal_probe,
753         .remove = ipoctal_remove,
754 };
755
756 static struct ipack_driver driver = {
757         .ops      = &ipoctal_drv_ops,
758         .id_table = ipoctal_ids,
759 };
760
761 static int __init ipoctal_init(void)
762 {
763         return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
764 }
765
766 static void __exit ipoctal_exit(void)
767 {
768         ipack_driver_unregister(&driver);
769 }
770
771 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
772 MODULE_LICENSE("GPL");
773
774 module_init(ipoctal_init);
775 module_exit(ipoctal_exit);