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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[net-next-2.6.git] / drivers / serial / mrst_max3110.c
CommitLineData
22510995
FT		 1/*
2 * max3110.c - spi uart protocol driver for Maxim 3110 on Moorestown
3 *
4 * Copyright (C) Intel 2008 Feng Tang <feng.tang@intel.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20/*
21 * Note:
22 * 1. From Max3110 spec, the Rx FIFO has 8 words, while the Tx FIFO only has
23 * 1 word. If SPI master controller doesn't support sclk frequency change,
24 * then the char need be sent out one by one with some delay
25 *
26 * 2. Currently only RX availabe interrrupt is used, no need for waiting TXE
27 * interrupt for a low speed UART device
28 */
29
30#include <linux/module.h>
31#include <linux/ioport.h>
c044391b 32#include <linux/irq.h>
22510995
FT		 33#include <linux/init.h>
34#include <linux/console.h>
35#include <linux/sysrq.h>
36#include <linux/platform_device.h>
37#include <linux/tty.h>
38#include <linux/tty_flip.h>
39#include <linux/serial_core.h>
40#include <linux/serial_reg.h>
41
42#include <linux/kthread.h>
43#include <linux/delay.h>
44#include <asm/atomic.h>
45#include <linux/spi/spi.h>
46#include <linux/spi/dw_spi.h>
47
48#include "mrst_max3110.h"
49
50#define PR_FMT "mrst_max3110: "
51
d6e679b4
AV		 52#define UART_TX_NEEDED 1
53#define CON_TX_NEEDED 2
54#define BIT_IRQ_PENDING 3
55
22510995
FT		 56struct uart_max3110 {
57 struct uart_port port;
58 struct spi_device *spi;
59 char *name;
60
61 wait_queue_head_t wq;
62 struct task_struct *main_thread;
63 struct task_struct *read_thread;
68c16b41 64 struct mutex thread_mutex;;
22510995
FT		 65
66 u32 baud;
67 u16 cur_conf;
68 u8 clock;
69 u8 parity, word_7bits;
70
d6e679b4 71 unsigned long uart_flags;
22510995
FT		 72
73 /* console related */
74 struct circ_buf con_xmit;
22510995
FT		 75
76 /* irq related */
77 u16 irq;
22510995
FT		 78};
79
80/* global data structure, may need be removed */
81struct uart_max3110 *pmax;
82static inline void receive_char(struct uart_max3110 *max, u8 ch);
83static void receive_chars(struct uart_max3110 *max,
84 unsigned char *str, int len);
85static int max3110_read_multi(struct uart_max3110 *max, int len, u8 *buf);
86static void max3110_console_receive(struct uart_max3110 *max);
87
88int max3110_write_then_read(struct uart_max3110 *max,
89 const u8 *txbuf, u8 *rxbuf, unsigned len, int always_fast)
90{
91 struct spi_device *spi = max->spi;
92 struct spi_message message;
93 struct spi_transfer x;
94 int ret;
95
96 if (!txbuf || !rxbuf)
97 return -EINVAL;
98
99 spi_message_init(&message);
100 memset(&x, 0, sizeof x);
101 x.len = len;
102 x.tx_buf = txbuf;
103 x.rx_buf = rxbuf;
104 spi_message_add_tail(&x, &message);
105
106 if (always_fast)
107 x.speed_hz = 3125000;
108 else if (max->baud)
109 x.speed_hz = max->baud;
110
111 /* Do the i/o */
112 ret = spi_sync(spi, &message);
113 return ret;
114}
115
116/* Write a u16 to the device, and return one u16 read back */
117int max3110_out(struct uart_max3110 *max, const u16 out)
118{
119 u16 tmp;
120 int ret;
121
122 ret = max3110_write_then_read(max, (u8 *)&out, (u8 *)&tmp, 2, 1);
123 if (ret)
124 return ret;
125
126 /* If some valid data is read back */
127 if (tmp & MAX3110_READ_DATA_AVAILABLE)
128 receive_char(max, (tmp & 0xff));
129
130 return ret;
131}
132
133#define MAX_READ_LEN 20
134/*
135 * This is usually used to read data from SPIC RX FIFO, which doesn't
136 * need any delay like flushing character out. It returns how many
137 * valide bytes are read back
138 */
139static int max3110_read_multi(struct uart_max3110 *max, int len, u8 *buf)
140{
141 u16 out[MAX_READ_LEN], in[MAX_READ_LEN];
142 u8 *pbuf, valid_str[MAX_READ_LEN];
143 int i, j, bytelen;
144
145 if (len > MAX_READ_LEN) {
146 pr_err(PR_FMT "read len %d is too large\n", len);
147 return 0;
148 }
149
150 bytelen = len * 2;
151 memset(out, 0, bytelen);
152 memset(in, 0, bytelen);
153
154 if (max3110_write_then_read(max, (u8 *)out, (u8 *)in, bytelen, 1))
155 return 0;
156
157 /* If caller don't provide a buffer, then handle received char */
158 pbuf = buf ? buf : valid_str;
159
160 for (i = 0, j = 0; i < len; i++) {
161 if (in[i] & MAX3110_READ_DATA_AVAILABLE)
162 pbuf[j++] = (u8)(in[i] & 0xff);
163 }
164
165 if (j && (pbuf == valid_str))
166 receive_chars(max, valid_str, j);
167
168 return j;
169}
170
171static void serial_m3110_con_putchar(struct uart_port *port, int ch)
172{
173 struct uart_max3110 *max =
174 container_of(port, struct uart_max3110, port);
175 struct circ_buf *xmit = &max->con_xmit;
176
177 if (uart_circ_chars_free(xmit)) {
178 xmit->buf[xmit->head] = (char)ch;
179 xmit->head = (xmit->head + 1) & (PAGE_SIZE - 1);
180 }
181
d6e679b4
AV		 182
183 if (!test_and_set_bit(CON_TX_NEEDED, &max->uart_flags))
22510995 184 wake_up_process(max->main_thread);
22510995
FT		 185}
186
187/*
188 * Print a string to the serial port trying not to disturb
189 * any possible real use of the port...
190 *
191 * The console_lock must be held when we get here.
192 */
193static void serial_m3110_con_write(struct console *co,
194 const char *s, unsigned int count)
195{
196 if (!pmax)
197 return;
198
199 uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar);
200}
201
202static int __init
203serial_m3110_con_setup(struct console *co, char *options)
204{
205 struct uart_max3110 *max = pmax;
206 int baud = 115200;
207 int bits = 8;
208 int parity = 'n';
209 int flow = 'n';
210
211 pr_info(PR_FMT "setting up console\n");
212
213 if (!max) {
214 pr_err(PR_FMT "pmax is NULL, return");
215 return -ENODEV;
216 }
217
218 if (options)
219 uart_parse_options(options, &baud, &parity, &bits, &flow);
220
221 return uart_set_options(&max->port, co, baud, parity, bits, flow);
222}
223
224static struct tty_driver *serial_m3110_con_device(struct console *co,
225 int *index)
226{
227 struct uart_driver *p = co->data;
228 *index = co->index;
229 return p->tty_driver;
230}
231
232static struct uart_driver serial_m3110_reg;
233static struct console serial_m3110_console = {
234 .name = "ttyS",
235 .write = serial_m3110_con_write,
236 .device = serial_m3110_con_device,
237 .setup = serial_m3110_con_setup,
238 .flags = CON_PRINTBUFFER,
239 .index = -1,
240 .data = &serial_m3110_reg,
241};
242
243#define MRST_CONSOLE (&serial_m3110_console)
244
245static unsigned int serial_m3110_tx_empty(struct uart_port *port)
246{
247 return 1;
248}
249
250static void serial_m3110_stop_tx(struct uart_port *port)
251{
252 return;
253}
254
255/* stop_rx will be called in spin_lock env */
256static void serial_m3110_stop_rx(struct uart_port *port)
257{
258 return;
259}
260
261#define WORDS_PER_XFER 128
262static inline void send_circ_buf(struct uart_max3110 *max,
263 struct circ_buf *xmit)
264{
265 int len, left = 0;
266 u16 obuf[WORDS_PER_XFER], ibuf[WORDS_PER_XFER];
267 u8 valid_str[WORDS_PER_XFER];
268 int i, j;
269
270 while (!uart_circ_empty(xmit)) {
271 left = uart_circ_chars_pending(xmit);
272 while (left) {
273 len = (left >= WORDS_PER_XFER) ? WORDS_PER_XFER : left;
274
275 memset(obuf, 0, len * 2);
276 memset(ibuf, 0, len * 2);
277 for (i = 0; i < len; i++) {
278 obuf[i] = (u8)xmit->buf[xmit->tail] | WD_TAG;
279 xmit->tail = (xmit->tail + 1) &
280 (UART_XMIT_SIZE - 1);
281 }
282 max3110_write_then_read(max, (u8 *)obuf,
283 (u8 *)ibuf, len * 2, 0);
284
285 for (i = 0, j = 0; i < len; i++) {
286 if (ibuf[i] & MAX3110_READ_DATA_AVAILABLE)
287 valid_str[j++] = (u8)(ibuf[i] & 0xff);
288 }
289
290 if (j)
291 receive_chars(max, valid_str, j);
292
293 max->port.icount.tx += len;
294 left -= len;
295 }
296 }
297}
298
299static void transmit_char(struct uart_max3110 *max)
300{
301 struct uart_port *port = &max->port;
302 struct circ_buf *xmit = &port->state->xmit;
303
304 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
305 return;
306
307 send_circ_buf(max, xmit);
308
309 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
310 uart_write_wakeup(port);
311
312 if (uart_circ_empty(xmit))
313 serial_m3110_stop_tx(port);
314}
315
316/* This will be called by uart_write() and tty_write, can't
317 * go to sleep */
318static void serial_m3110_start_tx(struct uart_port *port)
319{
320 struct uart_max3110 *max =
321 container_of(port, struct uart_max3110, port);
322
d6e679b4 323 if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags))
22510995 324 wake_up_process(max->main_thread);
22510995
FT		 325}
326
327static void receive_chars(struct uart_max3110 *max, unsigned char *str, int len)
328{
329 struct uart_port *port = &max->port;
330 struct tty_struct *tty;
331 int usable;
332
333 /* If uart is not opened, just return */
334 if (!port->state)
335 return;
336
337 tty = port->state->port.tty;
338 if (!tty)
339 return; /* receive some char before the tty is opened */
340
341 while (len) {
342 usable = tty_buffer_request_room(tty, len);
343 if (usable) {
344 tty_insert_flip_string(tty, str, usable);
345 str += usable;
346 port->icount.rx += usable;
347 tty_flip_buffer_push(tty);
348 }
349 len -= usable;
350 }
351}
352
353static inline void receive_char(struct uart_max3110 *max, u8 ch)
354{
355 receive_chars(max, &ch, 1);
356}
357
358static void max3110_console_receive(struct uart_max3110 *max)
359{
360 int loop = 1, num, total = 0;
361 u8 recv_buf[512], *pbuf;
362
363 pbuf = recv_buf;
364 do {
365 num = max3110_read_multi(max, 8, pbuf);
366
367 if (num) {
368 loop = 10;
369 pbuf += num;
370 total += num;
371
372 if (total >= 500) {
373 receive_chars(max, recv_buf, total);
374 pbuf = recv_buf;
375 total = 0;
376 }
377 }
378 } while (--loop);
379
380 if (total)
381 receive_chars(max, recv_buf, total);
382}
383
384static int max3110_main_thread(void *_max)
385{
386 struct uart_max3110 *max = _max;
387 wait_queue_head_t *wq = &max->wq;
388 int ret = 0;
389 struct circ_buf *xmit = &max->con_xmit;
390
391 init_waitqueue_head(wq);
392 pr_info(PR_FMT "start main thread\n");
393
394 do {
d6e679b4 395 wait_event_interruptible(*wq, max->uart_flags || kthread_should_stop());
68c16b41
AV		 396
397 mutex_lock(&max->thread_mutex);
22510995 398
d6e679b4 399 if (test_and_clear_bit(BIT_IRQ_PENDING, &max->uart_flags))
22510995 400 max3110_console_receive(max);
22510995
FT		 401
402 /* first handle console output */
d6e679b4 403 if (test_and_clear_bit(CON_TX_NEEDED, &max->uart_flags))
22510995 404 send_circ_buf(max, xmit);
22510995
FT		 405
406 /* handle uart output */
d6e679b4 407 if (test_and_clear_bit(UART_TX_NEEDED, &max->uart_flags))
22510995 408 transmit_char(max);
d6e679b4 409
68c16b41 410 mutex_unlock(&max->thread_mutex);
d6e679b4 411
22510995
FT		 412 } while (!kthread_should_stop());
413
414 return ret;
415}
416
417#ifdef CONFIG_MRST_MAX3110_IRQ
418static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
419{
420 struct uart_max3110 *max = dev_id;
421
422 /* max3110's irq is a falling edge, not level triggered,
423 * so no need to disable the irq */
d6e679b4 424 if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags))
22510995 425 wake_up_process(max->main_thread);
d6e679b4 426
22510995
FT		 427 return IRQ_HANDLED;
428}
429#else
430/* if don't use RX IRQ, then need a thread to polling read */
431static int max3110_read_thread(void *_max)
432{
433 struct uart_max3110 *max = _max;
434
435 pr_info(PR_FMT "start read thread\n");
436 do {
68c16b41
AV		 437 mutex_lock(&max->thread_mutex);
438 max3110_console_receive(max);
439 mutex_unlock(&max->thread_mutex);
22510995
FT		 440
441 set_current_state(TASK_INTERRUPTIBLE);
442 schedule_timeout(HZ / 20);
443 } while (!kthread_should_stop());
444
445 return 0;
446}
447#endif
448
449static int serial_m3110_startup(struct uart_port *port)
450{
451 struct uart_max3110 *max =
452 container_of(port, struct uart_max3110, port);
453 u16 config = 0;
454 int ret = 0;
455
456 if (port->line != 0)
457 pr_err(PR_FMT "uart port startup failed\n");
458
459 /* firstly disable all IRQ and config it to 115200, 8n1 */
460 config = WC_TAG | WC_FIFO_ENABLE
461 | WC_1_STOPBITS
462 | WC_8BIT_WORD
463 | WC_BAUD_DR2;
464 ret = max3110_out(max, config);
465
466 /* as we use thread to handle tx/rx, need set low latency */
467 port->state->port.tty->low_latency = 1;
468
469#ifdef CONFIG_MRST_MAX3110_IRQ
470 ret = request_irq(max->irq, serial_m3110_irq,
471 IRQ_TYPE_EDGE_FALLING, "max3110", max);
472 if (ret)
473 return ret;
474
475 /* enable RX IRQ only */
476 config |= WC_RXA_IRQ_ENABLE;
477 max3110_out(max, config);
478#else
479 /* if IRQ is disabled, start a read thread for input data */
480 max->read_thread =
481 kthread_run(max3110_read_thread, max, "max3110_read");
482#endif
483
484 max->cur_conf = config;
485 return 0;
486}
487
488static void serial_m3110_shutdown(struct uart_port *port)
489{
490 struct uart_max3110 *max =
491 container_of(port, struct uart_max3110, port);
492 u16 config;
493
494 if (max->read_thread) {
495 kthread_stop(max->read_thread);
496 max->read_thread = NULL;
497 }
498
499#ifdef CONFIG_MRST_MAX3110_IRQ
500 free_irq(max->irq, max);
501#endif
502
503 /* Disable interrupts from this port */
504 config = WC_TAG | WC_SW_SHDI;
505 max3110_out(max, config);
506}
507
508static void serial_m3110_release_port(struct uart_port *port)
509{
510}
511
512static int serial_m3110_request_port(struct uart_port *port)
513{
514 return 0;
515}
516
517static void serial_m3110_config_port(struct uart_port *port, int flags)
518{
519 /* give it fake type */
520 port->type = PORT_PXA;
521}
522
523static int
524serial_m3110_verify_port(struct uart_port *port, struct serial_struct *ser)
525{
526 /* we don't want the core code to modify any port params */
527 return -EINVAL;
528}
529
530
531static const char *serial_m3110_type(struct uart_port *port)
532{
533 struct uart_max3110 *max =
534 container_of(port, struct uart_max3110, port);
535 return max->name;
536}
537
538static void
539serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios,
540 struct ktermios *old)
541{
542 struct uart_max3110 *max =
543 container_of(port, struct uart_max3110, port);
544 unsigned char cval;
545 unsigned int baud, parity = 0;
546 int clk_div = -1;
547 u16 new_conf = max->cur_conf;
548
549 switch (termios->c_cflag & CSIZE) {
550 case CS7:
551 cval = UART_LCR_WLEN7;
552 new_conf |= WC_7BIT_WORD;
553 break;
554 default:
555 case CS8:
556 cval = UART_LCR_WLEN8;
557 new_conf |= WC_8BIT_WORD;
558 break;
559 }
560
561 baud = uart_get_baud_rate(port, termios, old, 0, 230400);
562
563 /* first calc the div for 1.8MHZ clock case */
564 switch (baud) {
565 case 300:
566 clk_div = WC_BAUD_DR384;
567 break;
568 case 600:
569 clk_div = WC_BAUD_DR192;
570 break;
571 case 1200:
572 clk_div = WC_BAUD_DR96;
573 break;
574 case 2400:
575 clk_div = WC_BAUD_DR48;
576 break;
577 case 4800:
578 clk_div = WC_BAUD_DR24;
579 break;
580 case 9600:
581 clk_div = WC_BAUD_DR12;
582 break;
583 case 19200:
584 clk_div = WC_BAUD_DR6;
585 break;
586 case 38400:
587 clk_div = WC_BAUD_DR3;
588 break;
589 case 57600:
590 clk_div = WC_BAUD_DR2;
591 break;
592 case 115200:
593 clk_div = WC_BAUD_DR1;
594 break;
595 case 230400:
596 if (max->clock & MAX3110_HIGH_CLK)
597 break;
598 default:
599 /* pick the previous baud rate */
600 baud = max->baud;
601 clk_div = max->cur_conf & WC_BAUD_DIV_MASK;
602 tty_termios_encode_baud_rate(termios, baud, baud);
603 }
604
605 if (max->clock & MAX3110_HIGH_CLK) {
606 clk_div += 1;
607 /* high clk version max3110 doesn't support B300 */
608 if (baud == 300)
609 baud = 600;
610 if (baud == 230400)
611 clk_div = WC_BAUD_DR1;
612 tty_termios_encode_baud_rate(termios, baud, baud);
613 }
614
615 new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div;
616 if (termios->c_cflag & CSTOPB)
617 new_conf |= WC_2_STOPBITS;
618 else
619 new_conf &= ~WC_2_STOPBITS;
620
621 if (termios->c_cflag & PARENB) {
622 new_conf |= WC_PARITY_ENABLE;
623 parity |= UART_LCR_PARITY;
624 } else
625 new_conf &= ~WC_PARITY_ENABLE;
626
627 if (!(termios->c_cflag & PARODD))
628 parity |= UART_LCR_EPAR;
629 max->parity = parity;
630
631 uart_update_timeout(port, termios->c_cflag, baud);
632
633 new_conf |= WC_TAG;
634 if (new_conf != max->cur_conf) {
635 max3110_out(max, new_conf);
636 max->cur_conf = new_conf;
637 max->baud = baud;
638 }
639}
640
641/* don't handle hw handshaking */
642static unsigned int serial_m3110_get_mctrl(struct uart_port *port)
643{
644 return TIOCM_DSR | TIOCM_CAR | TIOCM_DSR;
645}
646
647static void serial_m3110_set_mctrl(struct uart_port *port, unsigned int mctrl)
648{
649}
650
651static void serial_m3110_break_ctl(struct uart_port *port, int break_state)
652{
653}
654
655static void serial_m3110_pm(struct uart_port *port, unsigned int state,
656 unsigned int oldstate)
657{
658}
659
660static void serial_m3110_enable_ms(struct uart_port *port)
661{
662}
663
664struct uart_ops serial_m3110_ops = {
665 .tx_empty = serial_m3110_tx_empty,
666 .set_mctrl = serial_m3110_set_mctrl,
667 .get_mctrl = serial_m3110_get_mctrl,
668 .stop_tx = serial_m3110_stop_tx,
669 .start_tx = serial_m3110_start_tx,
670 .stop_rx = serial_m3110_stop_rx,
671 .enable_ms = serial_m3110_enable_ms,
672 .break_ctl = serial_m3110_break_ctl,
673 .startup = serial_m3110_startup,
674 .shutdown = serial_m3110_shutdown,
675 .set_termios = serial_m3110_set_termios, /* must have */
676 .pm = serial_m3110_pm,
677 .type = serial_m3110_type,
678 .release_port = serial_m3110_release_port,
679 .request_port = serial_m3110_request_port,
680 .config_port = serial_m3110_config_port,
681 .verify_port = serial_m3110_verify_port,
682};
683
684static struct uart_driver serial_m3110_reg = {
685 .owner = THIS_MODULE,
686 .driver_name = "MRST serial",
687 .dev_name = "ttyS",
688 .major = TTY_MAJOR,
689 .minor = 64,
690 .nr = 1,
691 .cons = MRST_CONSOLE,
692};
693
694static int serial_m3110_suspend(struct spi_device *spi, pm_message_t state)
695{
696 return 0;
697}
698
699static int serial_m3110_resume(struct spi_device *spi)
700{
701 return 0;
702}
703
704static struct dw_spi_chip spi0_uart = {
705 .poll_mode = 1,
706 .enable_dma = 0,
707 .type = SPI_FRF_SPI,
708};
709
710static int serial_m3110_probe(struct spi_device *spi)
711{
712 struct uart_max3110 *max;
713 int ret;
714 unsigned char *buffer;
99dd3f6b 715 u16 res;
22510995
FT		 716 max = kzalloc(sizeof(*max), GFP_KERNEL);
717 if (!max)
718 return -ENOMEM;
719
720 /* set spi info */
721 spi->mode = SPI_MODE_0;
722 spi->bits_per_word = 16;
723 max->clock = MAX3110_HIGH_CLK;
724 spi->controller_data = &spi0_uart;
725
726 spi_setup(spi);
727
728 max->port.type = PORT_PXA; /* need apply for a max3110 type */
729 max->port.fifosize = 2; /* only have 16b buffer */
730 max->port.ops = &serial_m3110_ops;
731 max->port.line = 0;
732 max->port.dev = &spi->dev;
733 max->port.uartclk = 115200;
734
735 max->spi = spi;
736 max->name = spi->modalias; /* use spi name as the name */
737 max->irq = (u16)spi->irq;
738
68c16b41 739 mutex_init(&max->thread_mutex);
22510995
FT		 740
741 max->word_7bits = 0;
742 max->parity = 0;
743 max->baud = 0;
744
745 max->cur_conf = 0;
d6e679b4
AV		 746 max->uart_flags = 0;
747
99dd3f6b 748 /* Check if reading configuration register returns something sane */
749
750 res = RC_TAG;
751 ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0);
752 if (ret < 0 || res == 0 || res == 0xffff) {
753 printk(KERN_ERR "MAX3111 deemed not present (conf reg %04x)",
754 res);
755 ret = -ENODEV;
756 goto err_get_page;
757 }
22510995
FT		 758 buffer = (unsigned char *)__get_free_page(GFP_KERNEL);
759 if (!buffer) {
760 ret = -ENOMEM;
761 goto err_get_page;
762 }
763 max->con_xmit.buf = (unsigned char *)buffer;
764 max->con_xmit.head = max->con_xmit.tail = 0;
765
766 max->main_thread = kthread_run(max3110_main_thread,
767 max, "max3110_main");
768 if (IS_ERR(max->main_thread)) {
769 ret = PTR_ERR(max->main_thread);
770 goto err_kthread;
771 }
772
773 pmax = max;
774 /* give membase a psudo value to pass serial_core's check */
775 max->port.membase = (void *)0xff110000;
776 uart_add_one_port(&serial_m3110_reg, &max->port);
777
778 return 0;
779
780err_kthread:
781 free_page((unsigned long)buffer);
782err_get_page:
783 pmax = NULL;
784 kfree(max);
785 return ret;
786}
787
788static int max3110_remove(struct spi_device *dev)
789{
790 struct uart_max3110 *max = pmax;
791
792 if (!pmax)
793 return 0;
794
795 pmax = NULL;
796 uart_remove_one_port(&serial_m3110_reg, &max->port);
797
798 free_page((unsigned long)max->con_xmit.buf);
799
800 if (max->main_thread)
801 kthread_stop(max->main_thread);
802
803 kfree(max);
804 return 0;
805}
806
807static struct spi_driver uart_max3110_driver = {
808 .driver = {
809 .name = "spi_max3111",
810 .bus = &spi_bus_type,
811 .owner = THIS_MODULE,
812 },
813 .probe = serial_m3110_probe,
814 .remove = __devexit_p(max3110_remove),
815 .suspend = serial_m3110_suspend,
816 .resume = serial_m3110_resume,
817};
818
819
820int __init serial_m3110_init(void)
821{
822 int ret = 0;
823
824 ret = uart_register_driver(&serial_m3110_reg);
825 if (ret)
826 return ret;
827
828 ret = spi_register_driver(&uart_max3110_driver);
829 if (ret)
830 uart_unregister_driver(&serial_m3110_reg);
831
832 return ret;
833}
834
835void __exit serial_m3110_exit(void)
836{
837 spi_unregister_driver(&uart_max3110_driver);
838 uart_unregister_driver(&serial_m3110_reg);
839}
840
841module_init(serial_m3110_init);
842module_exit(serial_m3110_exit);
843
844MODULE_LICENSE("GPL");
845MODULE_ALIAS("max3110-uart");
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