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powerpc/fadump: Do not allow hot-remove memory from fadump reserved area.
[linux/fpc-iii.git] / drivers / ipack / devices / ipoctal.c
blob75dd15d66df6fa415066e5a87f9786f46d066275
1 /**
2 * ipoctal.c
3 *
4 * driver for the GE IP-OCTAL boards
5 *
6 * Copyright (C) 2009-2012 CERN (www.cern.ch)
7 * Author: Nicolas Serafini, EIC2 SA
8 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; version 2 of the License.
13 */
14
15 #include <linux/device.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/sched.h>
19 #include <linux/tty.h>
20 #include <linux/serial.h>
21 #include <linux/tty_flip.h>
22 #include <linux/slab.h>
23 #include <linux/io.h>
24 #include <linux/ipack.h>
25 #include "ipoctal.h"
26 #include "scc2698.h"
27
28 #define IP_OCTAL_ID_SPACE_VECTOR 0x41
29 #define IP_OCTAL_NB_BLOCKS 4
30
31 static const struct tty_operations ipoctal_fops;
32
33 struct ipoctal_channel {
34 struct ipoctal_stats stats;
35 unsigned int nb_bytes;
36 wait_queue_head_t queue;
37 spinlock_t lock;
38 unsigned int pointer_read;
39 unsigned int pointer_write;
40 struct tty_port tty_port;
41 union scc2698_channel __iomem *regs;
42 union scc2698_block __iomem *block_regs;
43 unsigned int board_id;
44 u8 isr_rx_rdy_mask;
45 u8 isr_tx_rdy_mask;
46 unsigned int rx_enable;
47 };
48
49 struct ipoctal {
50 struct ipack_device *dev;
51 unsigned int board_id;
52 struct ipoctal_channel channel[NR_CHANNELS];
53 struct tty_driver *tty_drv;
54 u8 __iomem *mem8_space;
55 u8 __iomem *int_space;
56 };
57
58 static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
59 unsigned int index)
60 {
61 return container_of(chan, struct ipoctal, channel[index]);
62 }
63
64 static void ipoctal_reset_channel(struct ipoctal_channel *channel)
65 {
66 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
67 channel->rx_enable = 0;
68 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
69 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
70 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
71 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
72 }
73
74 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
75 {
76 struct ipoctal_channel *channel;
77
78 channel = dev_get_drvdata(tty->dev);
79
80 /*
81 * Enable RX. TX will be enabled when
82 * there is something to send
83 */
84 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
85 channel->rx_enable = 1;
86 return 0;
87 }
88
89 static int ipoctal_open(struct tty_struct *tty, struct file *file)
90 {
91 struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
92 struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
93 int err;
94
95 tty->driver_data = channel;
96
97 if (!ipack_get_carrier(ipoctal->dev))
98 return -EBUSY;
99
100 err = tty_port_open(&channel->tty_port, tty, file);
101 if (err)
102 ipack_put_carrier(ipoctal->dev);
103
104 return err;
105 }
106
107 static void ipoctal_reset_stats(struct ipoctal_stats *stats)
108 {
109 stats->tx = 0;
110 stats->rx = 0;
111 stats->rcv_break = 0;
112 stats->framing_err = 0;
113 stats->overrun_err = 0;
114 stats->parity_err = 0;
115 }
116
117 static void ipoctal_free_channel(struct ipoctal_channel *channel)
118 {
119 ipoctal_reset_stats(&channel->stats);
120 channel->pointer_read = 0;
121 channel->pointer_write = 0;
122 channel->nb_bytes = 0;
123 }
124
125 static void ipoctal_close(struct tty_struct *tty, struct file *filp)
126 {
127 struct ipoctal_channel *channel = tty->driver_data;
128
129 tty_port_close(&channel->tty_port, tty, filp);
130 ipoctal_free_channel(channel);
131 }
132
133 static int ipoctal_get_icount(struct tty_struct *tty,
134 struct serial_icounter_struct *icount)
135 {
136 struct ipoctal_channel *channel = tty->driver_data;
137
138 icount->cts = 0;
139 icount->dsr = 0;
140 icount->rng = 0;
141 icount->dcd = 0;
142 icount->rx = channel->stats.rx;
143 icount->tx = channel->stats.tx;
144 icount->frame = channel->stats.framing_err;
145 icount->parity = channel->stats.parity_err;
146 icount->brk = channel->stats.rcv_break;
147 return 0;
148 }
149
150 static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
151 {
152 struct tty_port *port = &channel->tty_port;
153 unsigned char value;
154 unsigned char flag;
155 u8 isr;
156
157 do {
158 value = ioread8(&channel->regs->r.rhr);
159 flag = TTY_NORMAL;
160 /* Error: count statistics */
161 if (sr & SR_ERROR) {
162 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
163
164 if (sr & SR_OVERRUN_ERROR) {
165 channel->stats.overrun_err++;
166 /* Overrun doesn't affect the current character*/
167 tty_insert_flip_char(port, 0, TTY_OVERRUN);
168 }
169 if (sr & SR_PARITY_ERROR) {
170 channel->stats.parity_err++;
171 flag = TTY_PARITY;
172 }
173 if (sr & SR_FRAMING_ERROR) {
174 channel->stats.framing_err++;
175 flag = TTY_FRAME;
176 }
177 if (sr & SR_RECEIVED_BREAK) {
178 channel->stats.rcv_break++;
179 flag = TTY_BREAK;
180 }
181 }
182 tty_insert_flip_char(port, value, flag);
183
184 /* Check if there are more characters in RX FIFO
185 * If there are more, the isr register for this channel
186 * has enabled the RxRDY|FFULL bit.
187 */
188 isr = ioread8(&channel->block_regs->r.isr);
189 sr = ioread8(&channel->regs->r.sr);
190 } while (isr & channel->isr_rx_rdy_mask);
191
192 tty_flip_buffer_push(port);
193 }
194
195 static void ipoctal_irq_tx(struct ipoctal_channel *channel)
196 {
197 unsigned char value;
198 unsigned int *pointer_write = &channel->pointer_write;
199
200 if (channel->nb_bytes == 0)
201 return;
202
203 spin_lock(&channel->lock);
204 value = channel->tty_port.xmit_buf[*pointer_write];
205 iowrite8(value, &channel->regs->w.thr);
206 channel->stats.tx++;
207 (*pointer_write)++;
208 *pointer_write = *pointer_write % PAGE_SIZE;
209 channel->nb_bytes--;
210 spin_unlock(&channel->lock);
211 }
212
213 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
214 {
215 u8 isr, sr;
216
217 /* The HW is organized in pair of channels. See which register we need
218 * to read from */
219 isr = ioread8(&channel->block_regs->r.isr);
220 sr = ioread8(&channel->regs->r.sr);
221
222 if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B))
223 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
224
225 if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
226 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
227 /* In case of RS-485, change from TX to RX when finishing TX.
228 * Half-duplex. */
229 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
230 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
231 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
232 channel->rx_enable = 1;
233 }
234 }
235
236 /* RX data */
237 if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
238 ipoctal_irq_rx(channel, sr);
239
240 /* TX of each character */
241 if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
242 ipoctal_irq_tx(channel);
243 }
244
245 static irqreturn_t ipoctal_irq_handler(void *arg)
246 {
247 unsigned int i;
248 struct ipoctal *ipoctal = (struct ipoctal *) arg;
249
250 /* Clear the IPack device interrupt */
251 readw(ipoctal->int_space + ACK_INT_REQ0);
252 readw(ipoctal->int_space + ACK_INT_REQ1);
253
254 /* Check all channels */
255 for (i = 0; i < NR_CHANNELS; i++)
256 ipoctal_irq_channel(&ipoctal->channel[i]);
257
258 return IRQ_HANDLED;
259 }
260
261 static const struct tty_port_operations ipoctal_tty_port_ops = {
262 .dtr_rts = NULL,
263 .activate = ipoctal_port_activate,
264 };
265
266 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
267 unsigned int slot)
268 {
269 int res;
270 int i;
271 struct tty_driver *tty;
272 char name[20];
273 struct ipoctal_channel *channel;
274 struct ipack_region *region;
275 void __iomem *addr;
276 union scc2698_channel __iomem *chan_regs;
277 union scc2698_block __iomem *block_regs;
278
279 ipoctal->board_id = ipoctal->dev->id_device;
280
281 region = &ipoctal->dev->region[IPACK_IO_SPACE];
282 addr = devm_ioremap_nocache(&ipoctal->dev->dev,
283 region->start, region->size);
284 if (!addr) {
285 dev_err(&ipoctal->dev->dev,
286 "Unable to map slot [%d:%d] IO space!\n",
287 bus_nr, slot);
288 return -EADDRNOTAVAIL;
289 }
290 /* Save the virtual address to access the registers easily */
291 chan_regs =
292 (union scc2698_channel __iomem *) addr;
293 block_regs =
294 (union scc2698_block __iomem *) addr;
295
296 region = &ipoctal->dev->region[IPACK_INT_SPACE];
297 ipoctal->int_space =
298 devm_ioremap_nocache(&ipoctal->dev->dev,
299 region->start, region->size);
300 if (!ipoctal->int_space) {
301 dev_err(&ipoctal->dev->dev,
302 "Unable to map slot [%d:%d] INT space!\n",
303 bus_nr, slot);
304 return -EADDRNOTAVAIL;
305 }
306
307 region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
308 ipoctal->mem8_space =
309 devm_ioremap_nocache(&ipoctal->dev->dev,
310 region->start, 0x8000);
311 if (!ipoctal->mem8_space) {
312 dev_err(&ipoctal->dev->dev,
313 "Unable to map slot [%d:%d] MEM8 space!\n",
314 bus_nr, slot);
315 return -EADDRNOTAVAIL;
316 }
317
318
319 /* Disable RX and TX before touching anything */
320 for (i = 0; i < NR_CHANNELS ; i++) {
321 struct ipoctal_channel *channel = &ipoctal->channel[i];
322 channel->regs = chan_regs + i;
323 channel->block_regs = block_regs + (i >> 1);
324 channel->board_id = ipoctal->board_id;
325 if (i & 1) {
326 channel->isr_tx_rdy_mask = ISR_TxRDY_B;
327 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
328 } else {
329 channel->isr_tx_rdy_mask = ISR_TxRDY_A;
330 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
331 }
332
333 ipoctal_reset_channel(channel);
334 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
335 &channel->regs->w.mr); /* mr1 */
336 iowrite8(0, &channel->regs->w.mr); /* mr2 */
337 iowrite8(TX_CLK_9600 | RX_CLK_9600, &channel->regs->w.csr);
338 }
339
340 for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
341 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
342 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
343 &block_regs[i].w.opcr);
344 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
345 IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
346 &block_regs[i].w.imr);
347 }
348
349 /* Dummy write */
350 iowrite8(1, ipoctal->mem8_space + 1);
351
352 /* Register the TTY device */
353
354 /* Each IP-OCTAL channel is a TTY port */
355 tty = alloc_tty_driver(NR_CHANNELS);
356
357 if (!tty)
358 return -ENOMEM;
359
360 /* Fill struct tty_driver with ipoctal data */
361 tty->owner = THIS_MODULE;
362 tty->driver_name = KBUILD_MODNAME;
363 sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
364 tty->name = name;
365 tty->major = 0;
366
367 tty->minor_start = 0;
368 tty->type = TTY_DRIVER_TYPE_SERIAL;
369 tty->subtype = SERIAL_TYPE_NORMAL;
370 tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
371 tty->init_termios = tty_std_termios;
372 tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
373 tty->init_termios.c_ispeed = 9600;
374 tty->init_termios.c_ospeed = 9600;
375
376 tty_set_operations(tty, &ipoctal_fops);
377 res = tty_register_driver(tty);
378 if (res) {
379 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
380 put_tty_driver(tty);
381 return res;
382 }
383
384 /* Save struct tty_driver for use it when uninstalling the device */
385 ipoctal->tty_drv = tty;
386
387 for (i = 0; i < NR_CHANNELS; i++) {
388 struct device *tty_dev;
389
390 channel = &ipoctal->channel[i];
391 tty_port_init(&channel->tty_port);
392 tty_port_alloc_xmit_buf(&channel->tty_port);
393 channel->tty_port.ops = &ipoctal_tty_port_ops;
394
395 ipoctal_reset_stats(&channel->stats);
396 channel->nb_bytes = 0;
397 spin_lock_init(&channel->lock);
398 channel->pointer_read = 0;
399 channel->pointer_write = 0;
400 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
401 if (IS_ERR(tty_dev)) {
402 dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
403 tty_port_destroy(&channel->tty_port);
404 continue;
405 }
406 dev_set_drvdata(tty_dev, channel);
407 }
408
409 /*
410 * IP-OCTAL has different addresses to copy its IRQ vector.
411 * Depending of the carrier these addresses are accesible or not.
412 * More info in the datasheet.
413 */
414 ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
415 ipoctal_irq_handler, ipoctal);
416
417 return 0;
418 }
419
420 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
421 const unsigned char *buf,
422 int count)
423 {
424 unsigned long flags;
425 int i;
426 unsigned int *pointer_read = &channel->pointer_read;
427
428 /* Copy the bytes from the user buffer to the internal one */
429 for (i = 0; i < count; i++) {
430 if (i <= (PAGE_SIZE - channel->nb_bytes)) {
431 spin_lock_irqsave(&channel->lock, flags);
432 channel->tty_port.xmit_buf[*pointer_read] = buf[i];
433 *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
434 channel->nb_bytes++;
435 spin_unlock_irqrestore(&channel->lock, flags);
436 } else {
437 break;
438 }
439 }
440 return i;
441 }
442
443 static int ipoctal_write_tty(struct tty_struct *tty,
444 const unsigned char *buf, int count)
445 {
446 struct ipoctal_channel *channel = tty->driver_data;
447 unsigned int char_copied;
448
449 char_copied = ipoctal_copy_write_buffer(channel, buf, count);
450
451 /* As the IP-OCTAL 485 only supports half duplex, do it manually */
452 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
453 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
454 channel->rx_enable = 0;
455 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
456 }
457
458 /*
459 * Send a packet and then disable TX to avoid failure after several send
460 * operations
461 */
462 iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
463 return char_copied;
464 }
465
466 static int ipoctal_write_room(struct tty_struct *tty)
467 {
468 struct ipoctal_channel *channel = tty->driver_data;
469
470 return PAGE_SIZE - channel->nb_bytes;
471 }
472
473 static int ipoctal_chars_in_buffer(struct tty_struct *tty)
474 {
475 struct ipoctal_channel *channel = tty->driver_data;
476
477 return channel->nb_bytes;
478 }
479
480 static void ipoctal_set_termios(struct tty_struct *tty,
481 struct ktermios *old_termios)
482 {
483 unsigned int cflag;
484 unsigned char mr1 = 0;
485 unsigned char mr2 = 0;
486 unsigned char csr = 0;
487 struct ipoctal_channel *channel = tty->driver_data;
488 speed_t baud;
489
490 cflag = tty->termios.c_cflag;
491
492 /* Disable and reset everything before change the setup */
493 ipoctal_reset_channel(channel);
494
495 /* Set Bits per chars */
496 switch (cflag & CSIZE) {
497 case CS6:
498 mr1 |= MR1_CHRL_6_BITS;
499 break;
500 case CS7:
501 mr1 |= MR1_CHRL_7_BITS;
502 break;
503 case CS8:
504 default:
505 mr1 |= MR1_CHRL_8_BITS;
506 /* By default, select CS8 */
507 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
508 break;
509 }
510
511 /* Set Parity */
512 if (cflag & PARENB)
513 if (cflag & PARODD)
514 mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
515 else
516 mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
517 else
518 mr1 |= MR1_PARITY_OFF;
519
520 /* Mark or space parity is not supported */
521 tty->termios.c_cflag &= ~CMSPAR;
522
523 /* Set stop bits */
524 if (cflag & CSTOPB)
525 mr2 |= MR2_STOP_BITS_LENGTH_2;
526 else
527 mr2 |= MR2_STOP_BITS_LENGTH_1;
528
529 /* Set the flow control */
530 switch (channel->board_id) {
531 case IPACK1_DEVICE_ID_SBS_OCTAL_232:
532 if (cflag & CRTSCTS) {
533 mr1 |= MR1_RxRTS_CONTROL_ON;
534 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
535 } else {
536 mr1 |= MR1_RxRTS_CONTROL_OFF;
537 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
538 }
539 break;
540 case IPACK1_DEVICE_ID_SBS_OCTAL_422:
541 mr1 |= MR1_RxRTS_CONTROL_OFF;
542 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
543 break;
544 case IPACK1_DEVICE_ID_SBS_OCTAL_485:
545 mr1 |= MR1_RxRTS_CONTROL_OFF;
546 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
547 break;
548 default:
549 return;
550 break;
551 }
552
553 baud = tty_get_baud_rate(tty);
554 tty_termios_encode_baud_rate(&tty->termios, baud, baud);
555
556 /* Set baud rate */
557 switch (baud) {
558 case 75:
559 csr |= TX_CLK_75 | RX_CLK_75;
560 break;
561 case 110:
562 csr |= TX_CLK_110 | RX_CLK_110;
563 break;
564 case 150:
565 csr |= TX_CLK_150 | RX_CLK_150;
566 break;
567 case 300:
568 csr |= TX_CLK_300 | RX_CLK_300;
569 break;
570 case 600:
571 csr |= TX_CLK_600 | RX_CLK_600;
572 break;
573 case 1200:
574 csr |= TX_CLK_1200 | RX_CLK_1200;
575 break;
576 case 1800:
577 csr |= TX_CLK_1800 | RX_CLK_1800;
578 break;
579 case 2000:
580 csr |= TX_CLK_2000 | RX_CLK_2000;
581 break;
582 case 2400:
583 csr |= TX_CLK_2400 | RX_CLK_2400;
584 break;
585 case 4800:
586 csr |= TX_CLK_4800 | RX_CLK_4800;
587 break;
588 case 9600:
589 csr |= TX_CLK_9600 | RX_CLK_9600;
590 break;
591 case 19200:
592 csr |= TX_CLK_19200 | RX_CLK_19200;
593 break;
594 case 38400:
595 default:
596 csr |= TX_CLK_38400 | RX_CLK_38400;
597 /* In case of default, we establish 38400 bps */
598 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
599 break;
600 }
601
602 mr1 |= MR1_ERROR_CHAR;
603 mr1 |= MR1_RxINT_RxRDY;
604
605 /* Write the control registers */
606 iowrite8(mr1, &channel->regs->w.mr);
607 iowrite8(mr2, &channel->regs->w.mr);
608 iowrite8(csr, &channel->regs->w.csr);
609
610 /* Enable again the RX, if it was before */
611 if (channel->rx_enable)
612 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
613 }
614
615 static void ipoctal_hangup(struct tty_struct *tty)
616 {
617 unsigned long flags;
618 struct ipoctal_channel *channel = tty->driver_data;
619
620 if (channel == NULL)
621 return;
622
623 spin_lock_irqsave(&channel->lock, flags);
624 channel->nb_bytes = 0;
625 channel->pointer_read = 0;
626 channel->pointer_write = 0;
627 spin_unlock_irqrestore(&channel->lock, flags);
628
629 tty_port_hangup(&channel->tty_port);
630
631 ipoctal_reset_channel(channel);
632 tty_port_set_initialized(&channel->tty_port, 0);
633 wake_up_interruptible(&channel->tty_port.open_wait);
634 }
635
636 static void ipoctal_shutdown(struct tty_struct *tty)
637 {
638 struct ipoctal_channel *channel = tty->driver_data;
639
640 if (channel == NULL)
641 return;
642
643 ipoctal_reset_channel(channel);
644 tty_port_set_initialized(&channel->tty_port, 0);
645 }
646
647 static void ipoctal_cleanup(struct tty_struct *tty)
648 {
649 struct ipoctal_channel *channel = tty->driver_data;
650 struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
651
652 /* release the carrier driver */
653 ipack_put_carrier(ipoctal->dev);
654 }
655
656 static const struct tty_operations ipoctal_fops = {
657 .ioctl = NULL,
658 .open = ipoctal_open,
659 .close = ipoctal_close,
660 .write = ipoctal_write_tty,
661 .set_termios = ipoctal_set_termios,
662 .write_room = ipoctal_write_room,
663 .chars_in_buffer = ipoctal_chars_in_buffer,
664 .get_icount = ipoctal_get_icount,
665 .hangup = ipoctal_hangup,
666 .shutdown = ipoctal_shutdown,
667 .cleanup = ipoctal_cleanup,
668 };
669
670 static int ipoctal_probe(struct ipack_device *dev)
671 {
672 int res;
673 struct ipoctal *ipoctal;
674
675 ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
676 if (ipoctal == NULL)
677 return -ENOMEM;
678
679 ipoctal->dev = dev;
680 res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
681 if (res)
682 goto out_uninst;
683
684 dev_set_drvdata(&dev->dev, ipoctal);
685 return 0;
686
687 out_uninst:
688 kfree(ipoctal);
689 return res;
690 }
691
692 static void __ipoctal_remove(struct ipoctal *ipoctal)
693 {
694 int i;
695
696 ipoctal->dev->bus->ops->free_irq(ipoctal->dev);
697
698 for (i = 0; i < NR_CHANNELS; i++) {
699 struct ipoctal_channel *channel = &ipoctal->channel[i];
700 tty_unregister_device(ipoctal->tty_drv, i);
701 tty_port_free_xmit_buf(&channel->tty_port);
702 tty_port_destroy(&channel->tty_port);
703 }
704
705 tty_unregister_driver(ipoctal->tty_drv);
706 put_tty_driver(ipoctal->tty_drv);
707 kfree(ipoctal);
708 }
709
710 static void ipoctal_remove(struct ipack_device *idev)
711 {
712 __ipoctal_remove(dev_get_drvdata(&idev->dev));
713 }
714
715 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
716 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
717 IPACK1_DEVICE_ID_SBS_OCTAL_232) },
718 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
719 IPACK1_DEVICE_ID_SBS_OCTAL_422) },
720 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
721 IPACK1_DEVICE_ID_SBS_OCTAL_485) },
722 { 0, },
723 };
724
725 MODULE_DEVICE_TABLE(ipack, ipoctal_ids);
726
727 static const struct ipack_driver_ops ipoctal_drv_ops = {
728 .probe = ipoctal_probe,
729 .remove = ipoctal_remove,
730 };
731
732 static struct ipack_driver driver = {
733 .ops = &ipoctal_drv_ops,
734 .id_table = ipoctal_ids,
735 };
736
737 static int __init ipoctal_init(void)
738 {
739 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
740 }
741
742 static void __exit ipoctal_exit(void)
743 {
744 ipack_driver_unregister(&driver);
745 }
746
747 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
748 MODULE_LICENSE("GPL");
749
750 module_init(ipoctal_init);
751 module_exit(ipoctal_exit);
Linux with added FPC-III support