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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* linux/drivers/i2c/busses/i2c-s3c2410.c
2 *
3 * Copyright (C) 2004,2005 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2410 I2C Controller
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21*/
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/kernel.h>
24#include <linux/module.h>
25
26#include <linux/i2c.h>
27#include <linux/i2c-id.h>
28#include <linux/init.h>
29#include <linux/time.h>
30#include <linux/interrupt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/delay.h>
32#include <linux/errno.h>
33#include <linux/err.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010034#include <linux/platform_device.h>
Russell Kingf8ce2542006-01-07 16:15:52 +000035#include <linux/clk.h>
Ben Dooks61c7cff2008-07-28 12:04:07 +010036#include <linux/cpufreq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Russell Kinga09e64f2008-08-05 16:14:15 +010038#include <mach/hardware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/irq.h>
40#include <asm/io.h>
41
Russell Kinga09e64f2008-08-05 16:14:15 +010042#include <mach/regs-gpio.h>
Ben Dooksb5d0b4b2007-08-14 18:37:15 +020043#include <asm/plat-s3c/regs-iic.h>
44#include <asm/plat-s3c/iic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46/* i2c controller state */
47
48enum s3c24xx_i2c_state {
49 STATE_IDLE,
50 STATE_START,
51 STATE_READ,
52 STATE_WRITE,
53 STATE_STOP
54};
55
56struct s3c24xx_i2c {
57 spinlock_t lock;
58 wait_queue_head_t wait;
59
60 struct i2c_msg *msg;
61 unsigned int msg_num;
62 unsigned int msg_idx;
63 unsigned int msg_ptr;
64
Ben Dookse00a8cd2007-05-01 23:26:35 +020065 unsigned int tx_setup;
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 enum s3c24xx_i2c_state state;
Ben Dooks61c7cff2008-07-28 12:04:07 +010068 unsigned long clkrate;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 void __iomem *regs;
71 struct clk *clk;
72 struct device *dev;
73 struct resource *irq;
74 struct resource *ioarea;
75 struct i2c_adapter adap;
Ben Dooks61c7cff2008-07-28 12:04:07 +010076
77#ifdef CONFIG_CPU_FREQ
78 struct notifier_block freq_transition;
79#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070080};
81
82/* default platform data to use if not supplied in the platform_device
83*/
84
85static struct s3c2410_platform_i2c s3c24xx_i2c_default_platform = {
86 .flags = 0,
87 .slave_addr = 0x10,
88 .bus_freq = 100*1000,
89 .max_freq = 400*1000,
90 .sda_delay = S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
91};
92
93/* s3c24xx_i2c_is2440()
94 *
95 * return true is this is an s3c2440
96*/
97
98static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c *i2c)
99{
100 struct platform_device *pdev = to_platform_device(i2c->dev);
101
102 return !strcmp(pdev->name, "s3c2440-i2c");
103}
104
105
106/* s3c24xx_i2c_get_platformdata
107 *
108 * get the platform data associated with the given device, or return
109 * the default if there is none
110*/
111
Ben Dooks3d0911b2008-10-31 16:10:24 +0000112static inline struct s3c2410_platform_i2c *
113s3c24xx_i2c_get_platformdata(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
115 if (dev->platform_data != NULL)
116 return (struct s3c2410_platform_i2c *)dev->platform_data;
117
118 return &s3c24xx_i2c_default_platform;
119}
120
121/* s3c24xx_i2c_master_complete
122 *
123 * complete the message and wake up the caller, using the given return code,
124 * or zero to mean ok.
125*/
126
127static inline void s3c24xx_i2c_master_complete(struct s3c24xx_i2c *i2c, int ret)
128{
129 dev_dbg(i2c->dev, "master_complete %d\n", ret);
130
131 i2c->msg_ptr = 0;
132 i2c->msg = NULL;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000133 i2c->msg_idx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 i2c->msg_num = 0;
135 if (ret)
136 i2c->msg_idx = ret;
137
138 wake_up(&i2c->wait);
139}
140
141static inline void s3c24xx_i2c_disable_ack(struct s3c24xx_i2c *i2c)
142{
143 unsigned long tmp;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 tmp = readl(i2c->regs + S3C2410_IICCON);
146 writel(tmp & ~S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
149static inline void s3c24xx_i2c_enable_ack(struct s3c24xx_i2c *i2c)
150{
151 unsigned long tmp;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 tmp = readl(i2c->regs + S3C2410_IICCON);
154 writel(tmp | S3C2410_IICCON_ACKEN, i2c->regs + S3C2410_IICCON);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155}
156
157/* irq enable/disable functions */
158
159static inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c)
160{
161 unsigned long tmp;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 tmp = readl(i2c->regs + S3C2410_IICCON);
164 writel(tmp & ~S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON);
165}
166
167static inline void s3c24xx_i2c_enable_irq(struct s3c24xx_i2c *i2c)
168{
169 unsigned long tmp;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 tmp = readl(i2c->regs + S3C2410_IICCON);
172 writel(tmp | S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON);
173}
174
175
176/* s3c24xx_i2c_message_start
177 *
Ben Dooks3d0911b2008-10-31 16:10:24 +0000178 * put the start of a message onto the bus
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179*/
180
Ben Dooks3d0911b2008-10-31 16:10:24 +0000181static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 struct i2c_msg *msg)
183{
184 unsigned int addr = (msg->addr & 0x7f) << 1;
185 unsigned long stat;
186 unsigned long iiccon;
187
188 stat = 0;
189 stat |= S3C2410_IICSTAT_TXRXEN;
190
191 if (msg->flags & I2C_M_RD) {
192 stat |= S3C2410_IICSTAT_MASTER_RX;
193 addr |= 1;
194 } else
195 stat |= S3C2410_IICSTAT_MASTER_TX;
196
197 if (msg->flags & I2C_M_REV_DIR_ADDR)
198 addr ^= 1;
199
Ben Dooks3d0911b2008-10-31 16:10:24 +0000200 /* todo - check for wether ack wanted or not */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 s3c24xx_i2c_enable_ack(i2c);
202
203 iiccon = readl(i2c->regs + S3C2410_IICCON);
204 writel(stat, i2c->regs + S3C2410_IICSTAT);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 dev_dbg(i2c->dev, "START: %08lx to IICSTAT, %02x to DS\n", stat, addr);
207 writeb(addr, i2c->regs + S3C2410_IICDS);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000208
Ben Dookse00a8cd2007-05-01 23:26:35 +0200209 /* delay here to ensure the data byte has gotten onto the bus
210 * before the transaction is started */
211
212 ndelay(i2c->tx_setup);
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 dev_dbg(i2c->dev, "iiccon, %08lx\n", iiccon);
215 writel(iiccon, i2c->regs + S3C2410_IICCON);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000216
217 stat |= S3C2410_IICSTAT_START;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 writel(stat, i2c->regs + S3C2410_IICSTAT);
219}
220
221static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret)
222{
223 unsigned long iicstat = readl(i2c->regs + S3C2410_IICSTAT);
224
225 dev_dbg(i2c->dev, "STOP\n");
226
227 /* stop the transfer */
Ben Dooks3d0911b2008-10-31 16:10:24 +0000228 iicstat &= ~S3C2410_IICSTAT_START;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 writel(iicstat, i2c->regs + S3C2410_IICSTAT);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 i2c->state = STATE_STOP;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 s3c24xx_i2c_master_complete(i2c, ret);
234 s3c24xx_i2c_disable_irq(i2c);
235}
236
237/* helper functions to determine the current state in the set of
238 * messages we are sending */
239
240/* is_lastmsg()
241 *
Ben Dooks3d0911b2008-10-31 16:10:24 +0000242 * returns TRUE if the current message is the last in the set
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243*/
244
245static inline int is_lastmsg(struct s3c24xx_i2c *i2c)
246{
247 return i2c->msg_idx >= (i2c->msg_num - 1);
248}
249
250/* is_msglast
251 *
252 * returns TRUE if we this is the last byte in the current message
253*/
254
255static inline int is_msglast(struct s3c24xx_i2c *i2c)
256{
257 return i2c->msg_ptr == i2c->msg->len-1;
258}
259
260/* is_msgend
261 *
262 * returns TRUE if we reached the end of the current message
263*/
264
265static inline int is_msgend(struct s3c24xx_i2c *i2c)
266{
267 return i2c->msg_ptr >= i2c->msg->len;
268}
269
270/* i2s_s3c_irq_nextbyte
271 *
272 * process an interrupt and work out what to do
273 */
274
275static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
276{
277 unsigned long tmp;
278 unsigned char byte;
279 int ret = 0;
280
281 switch (i2c->state) {
282
283 case STATE_IDLE:
Harvey Harrison08882d22008-04-22 22:16:47 +0200284 dev_err(i2c->dev, "%s: called in STATE_IDLE\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 goto out;
286 break;
287
288 case STATE_STOP:
Harvey Harrison08882d22008-04-22 22:16:47 +0200289 dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000290 s3c24xx_i2c_disable_irq(i2c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 goto out_ack;
292
293 case STATE_START:
294 /* last thing we did was send a start condition on the
295 * bus, or started a new i2c message
296 */
Ben Dooks3d0911b2008-10-31 16:10:24 +0000297
Ben Dooks63f5c282008-07-01 11:59:42 +0100298 if (iicstat & S3C2410_IICSTAT_LASTBIT &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 !(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
300 /* ack was not received... */
301
302 dev_dbg(i2c->dev, "ack was not received\n");
Ben Dooks63f5c282008-07-01 11:59:42 +0100303 s3c24xx_i2c_stop(i2c, -ENXIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 goto out_ack;
305 }
306
307 if (i2c->msg->flags & I2C_M_RD)
308 i2c->state = STATE_READ;
309 else
310 i2c->state = STATE_WRITE;
311
312 /* terminate the transfer if there is nothing to do
Ben Dooks63f5c282008-07-01 11:59:42 +0100313 * as this is used by the i2c probe to find devices. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 if (is_lastmsg(i2c) && i2c->msg->len == 0) {
316 s3c24xx_i2c_stop(i2c, 0);
317 goto out_ack;
318 }
319
320 if (i2c->state == STATE_READ)
321 goto prepare_read;
322
Ben Dooks3d0911b2008-10-31 16:10:24 +0000323 /* fall through to the write state, as we will need to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 * send a byte as well */
325
326 case STATE_WRITE:
327 /* we are writing data to the device... check for the
328 * end of the message, and if so, work out what to do
329 */
330
Ben Dooks27097812008-07-01 11:59:41 +0100331 if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
332 if (iicstat & S3C2410_IICSTAT_LASTBIT) {
333 dev_dbg(i2c->dev, "WRITE: No Ack\n");
334
335 s3c24xx_i2c_stop(i2c, -ECONNREFUSED);
336 goto out_ack;
337 }
338 }
339
Ben Dooks3d0911b2008-10-31 16:10:24 +0000340 retry_write:
Ben Dooks27097812008-07-01 11:59:41 +0100341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 if (!is_msgend(i2c)) {
343 byte = i2c->msg->buf[i2c->msg_ptr++];
344 writeb(byte, i2c->regs + S3C2410_IICDS);
Ben Dookse00a8cd2007-05-01 23:26:35 +0200345
346 /* delay after writing the byte to allow the
347 * data setup time on the bus, as writing the
348 * data to the register causes the first bit
349 * to appear on SDA, and SCL will change as
350 * soon as the interrupt is acknowledged */
351
352 ndelay(i2c->tx_setup);
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 } else if (!is_lastmsg(i2c)) {
355 /* we need to go to the next i2c message */
356
357 dev_dbg(i2c->dev, "WRITE: Next Message\n");
358
359 i2c->msg_ptr = 0;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000360 i2c->msg_idx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 i2c->msg++;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 /* check to see if we need to do another message */
364 if (i2c->msg->flags & I2C_M_NOSTART) {
365
366 if (i2c->msg->flags & I2C_M_RD) {
367 /* cannot do this, the controller
368 * forces us to send a new START
369 * when we change direction */
370
371 s3c24xx_i2c_stop(i2c, -EINVAL);
372 }
373
374 goto retry_write;
375 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 /* send the new start */
377 s3c24xx_i2c_message_start(i2c, i2c->msg);
378 i2c->state = STATE_START;
379 }
380
381 } else {
382 /* send stop */
383
384 s3c24xx_i2c_stop(i2c, 0);
385 }
386 break;
387
388 case STATE_READ:
Ben Dooks3d0911b2008-10-31 16:10:24 +0000389 /* we have a byte of data in the data register, do
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 * something with it, and then work out wether we are
391 * going to do any more read/write
392 */
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 byte = readb(i2c->regs + S3C2410_IICDS);
395 i2c->msg->buf[i2c->msg_ptr++] = byte;
396
Ben Dooks3d0911b2008-10-31 16:10:24 +0000397 prepare_read:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 if (is_msglast(i2c)) {
399 /* last byte of buffer */
400
401 if (is_lastmsg(i2c))
402 s3c24xx_i2c_disable_ack(i2c);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 } else if (is_msgend(i2c)) {
405 /* ok, we've read the entire buffer, see if there
406 * is anything else we need to do */
407
408 if (is_lastmsg(i2c)) {
409 /* last message, send stop and complete */
410 dev_dbg(i2c->dev, "READ: Send Stop\n");
411
412 s3c24xx_i2c_stop(i2c, 0);
413 } else {
414 /* go to the next transfer */
415 dev_dbg(i2c->dev, "READ: Next Transfer\n");
416
417 i2c->msg_ptr = 0;
418 i2c->msg_idx++;
419 i2c->msg++;
420 }
421 }
422
423 break;
424 }
425
426 /* acknowlegde the IRQ and get back on with the work */
427
428 out_ack:
Ben Dooks3d0911b2008-10-31 16:10:24 +0000429 tmp = readl(i2c->regs + S3C2410_IICCON);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 tmp &= ~S3C2410_IICCON_IRQPEND;
431 writel(tmp, i2c->regs + S3C2410_IICCON);
432 out:
433 return ret;
434}
435
436/* s3c24xx_i2c_irq
437 *
438 * top level IRQ servicing routine
439*/
440
David Howells7d12e782006-10-05 14:55:46 +0100441static irqreturn_t s3c24xx_i2c_irq(int irqno, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 struct s3c24xx_i2c *i2c = dev_id;
444 unsigned long status;
445 unsigned long tmp;
446
447 status = readl(i2c->regs + S3C2410_IICSTAT);
448
449 if (status & S3C2410_IICSTAT_ARBITR) {
Ben Dooks3d0911b2008-10-31 16:10:24 +0000450 /* deal with arbitration loss */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 dev_err(i2c->dev, "deal with arbitration loss\n");
452 }
453
454 if (i2c->state == STATE_IDLE) {
455 dev_dbg(i2c->dev, "IRQ: error i2c->state == IDLE\n");
456
Ben Dooks3d0911b2008-10-31 16:10:24 +0000457 tmp = readl(i2c->regs + S3C2410_IICCON);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 tmp &= ~S3C2410_IICCON_IRQPEND;
459 writel(tmp, i2c->regs + S3C2410_IICCON);
460 goto out;
461 }
Ben Dooks3d0911b2008-10-31 16:10:24 +0000462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 /* pretty much this leaves us with the fact that we've
464 * transmitted or received whatever byte we last sent */
465
466 i2s_s3c_irq_nextbyte(i2c, status);
467
468 out:
469 return IRQ_HANDLED;
470}
471
472
473/* s3c24xx_i2c_set_master
474 *
475 * get the i2c bus for a master transaction
476*/
477
478static int s3c24xx_i2c_set_master(struct s3c24xx_i2c *i2c)
479{
480 unsigned long iicstat;
481 int timeout = 400;
482
483 while (timeout-- > 0) {
484 iicstat = readl(i2c->regs + S3C2410_IICSTAT);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 if (!(iicstat & S3C2410_IICSTAT_BUSBUSY))
487 return 0;
488
489 msleep(1);
490 }
491
492 dev_dbg(i2c->dev, "timeout: GPEDAT is %08x\n",
493 __raw_readl(S3C2410_GPEDAT));
494
495 return -ETIMEDOUT;
496}
497
498/* s3c24xx_i2c_doxfer
499 *
500 * this starts an i2c transfer
501*/
502
Ben Dooks3d0911b2008-10-31 16:10:24 +0000503static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c,
504 struct i2c_msg *msgs, int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
506 unsigned long timeout;
507 int ret;
508
Julia Lawallda6801e2008-10-30 15:55:47 +0100509 if (!(readl(i2c->regs + S3C2410_IICCON) & S3C2410_IICCON_IRQEN))
Ben Dooks61c7cff2008-07-28 12:04:07 +0100510 return -EIO;
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 ret = s3c24xx_i2c_set_master(i2c);
513 if (ret != 0) {
514 dev_err(i2c->dev, "cannot get bus (error %d)\n", ret);
515 ret = -EAGAIN;
516 goto out;
517 }
518
519 spin_lock_irq(&i2c->lock);
520
521 i2c->msg = msgs;
522 i2c->msg_num = num;
523 i2c->msg_ptr = 0;
524 i2c->msg_idx = 0;
525 i2c->state = STATE_START;
526
527 s3c24xx_i2c_enable_irq(i2c);
528 s3c24xx_i2c_message_start(i2c, msgs);
529 spin_unlock_irq(&i2c->lock);
Ben Dooks3d0911b2008-10-31 16:10:24 +0000530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
532
533 ret = i2c->msg_idx;
534
Ben Dooks3d0911b2008-10-31 16:10:24 +0000535 /* having these next two as dev_err() makes life very
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 * noisy when doing an i2cdetect */
537
538 if (timeout == 0)
539 dev_dbg(i2c->dev, "timeout\n");
540 else if (ret != num)
541 dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret);
542
543 /* ensure the stop has been through the bus */
544
545 msleep(1);
546
547 out:
548 return ret;
549}
550
551/* s3c24xx_i2c_xfer
552 *
553 * first port of call from the i2c bus code when an message needs
Steven Cole44bbe872005-05-03 18:21:25 -0600554 * transferring across the i2c bus.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555*/
556
557static int s3c24xx_i2c_xfer(struct i2c_adapter *adap,
558 struct i2c_msg *msgs, int num)
559{
560 struct s3c24xx_i2c *i2c = (struct s3c24xx_i2c *)adap->algo_data;
561 int retry;
562 int ret;
563
564 for (retry = 0; retry < adap->retries; retry++) {
565
566 ret = s3c24xx_i2c_doxfer(i2c, msgs, num);
567
568 if (ret != -EAGAIN)
569 return ret;
570
571 dev_dbg(i2c->dev, "Retrying transmission (%d)\n", retry);
572
573 udelay(100);
574 }
575
576 return -EREMOTEIO;
577}
578
579/* declare our i2c functionality */
580static u32 s3c24xx_i2c_func(struct i2c_adapter *adap)
581{
582 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING;
583}
584
585/* i2c bus registration info */
586
Jean Delvare8f9082c2006-09-03 22:39:46 +0200587static const struct i2c_algorithm s3c24xx_i2c_algorithm = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 .master_xfer = s3c24xx_i2c_xfer,
589 .functionality = s3c24xx_i2c_func,
590};
591
592static struct s3c24xx_i2c s3c24xx_i2c = {
Ben Dookse00a8cd2007-05-01 23:26:35 +0200593 .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_i2c.lock),
594 .wait = __WAIT_QUEUE_HEAD_INITIALIZER(s3c24xx_i2c.wait),
595 .tx_setup = 50,
596 .adap = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 .name = "s3c2410-i2c",
598 .owner = THIS_MODULE,
599 .algo = &s3c24xx_i2c_algorithm,
600 .retries = 2,
Jean Delvare3401b2f2008-07-14 22:38:29 +0200601 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 },
603};
604
605/* s3c24xx_i2c_calcdivisor
606 *
607 * return the divisor settings for a given frequency
608*/
609
610static int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted,
611 unsigned int *div1, unsigned int *divs)
612{
613 unsigned int calc_divs = clkin / wanted;
614 unsigned int calc_div1;
615
616 if (calc_divs > (16*16))
617 calc_div1 = 512;
618 else
619 calc_div1 = 16;
620
621 calc_divs += calc_div1-1;
622 calc_divs /= calc_div1;
623
624 if (calc_divs == 0)
625 calc_divs = 1;
626 if (calc_divs > 17)
627 calc_divs = 17;
628
629 *divs = calc_divs;
630 *div1 = calc_div1;
631
632 return clkin / (calc_divs * calc_div1);
633}
634
635/* freq_acceptable
636 *
637 * test wether a frequency is within the acceptable range of error
638*/
639
640static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
641{
642 int diff = freq - wanted;
643
Ben Dooks3d0911b2008-10-31 16:10:24 +0000644 return diff >= -2 && diff <= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645}
646
Ben Dooks61c7cff2008-07-28 12:04:07 +0100647/* s3c24xx_i2c_clockrate
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 *
649 * work out a divisor for the user requested frequency setting,
650 * either by the requested frequency, or scanning the acceptable
651 * range of frequencies until something is found
652*/
653
Ben Dooks61c7cff2008-07-28 12:04:07 +0100654static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
Ben Dooks61c7cff2008-07-28 12:04:07 +0100656 struct s3c2410_platform_i2c *pdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 unsigned long clkin = clk_get_rate(i2c->clk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 unsigned int divs, div1;
Ben Dooks61c7cff2008-07-28 12:04:07 +0100659 u32 iiccon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 int freq;
661 int start, end;
662
Ben Dooks61c7cff2008-07-28 12:04:07 +0100663 i2c->clkrate = clkin;
664
665 pdata = s3c24xx_i2c_get_platformdata(i2c->adap.dev.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 clkin /= 1000; /* clkin now in KHz */
Ben Dooks3d0911b2008-10-31 16:10:24 +0000667
Ben Dooks61c7cff2008-07-28 12:04:07 +0100668 dev_dbg(i2c->dev, "pdata %p, freq %lu %lu..%lu\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 pdata, pdata->bus_freq, pdata->min_freq, pdata->max_freq);
670
671 if (pdata->bus_freq != 0) {
672 freq = s3c24xx_i2c_calcdivisor(clkin, pdata->bus_freq/1000,
673 &div1, &divs);
674 if (freq_acceptable(freq, pdata->bus_freq/1000))
675 goto found;
676 }
677
678 /* ok, we may have to search for something suitable... */
679
680 start = (pdata->max_freq == 0) ? pdata->bus_freq : pdata->max_freq;
681 end = pdata->min_freq;
682
683 start /= 1000;
684 end /= 1000;
685
686 /* search loop... */
687
688 for (; start > end; start--) {
689 freq = s3c24xx_i2c_calcdivisor(clkin, start, &div1, &divs);
690 if (freq_acceptable(freq, start))
691 goto found;
692 }
693
694 /* cannot find frequency spec */
695
696 return -EINVAL;
697
698 found:
699 *got = freq;
Ben Dooks61c7cff2008-07-28 12:04:07 +0100700
701 iiccon = readl(i2c->regs + S3C2410_IICCON);
702 iiccon &= ~(S3C2410_IICCON_SCALEMASK | S3C2410_IICCON_TXDIV_512);
703 iiccon |= (divs-1);
704
705 if (div1 == 512)
706 iiccon |= S3C2410_IICCON_TXDIV_512;
707
708 writel(iiccon, i2c->regs + S3C2410_IICCON);
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 return 0;
711}
712
Ben Dooks61c7cff2008-07-28 12:04:07 +0100713#ifdef CONFIG_CPU_FREQ
714
715#define freq_to_i2c(_n) container_of(_n, struct s3c24xx_i2c, freq_transition)
716
717static int s3c24xx_i2c_cpufreq_transition(struct notifier_block *nb,
718 unsigned long val, void *data)
719{
720 struct s3c24xx_i2c *i2c = freq_to_i2c(nb);
721 unsigned long flags;
722 unsigned int got;
723 int delta_f;
724 int ret;
725
726 delta_f = clk_get_rate(i2c->clk) - i2c->clkrate;
727
728 /* if we're post-change and the input clock has slowed down
729 * or at pre-change and the clock is about to speed up, then
730 * adjust our clock rate. <0 is slow, >0 speedup.
731 */
732
733 if ((val == CPUFREQ_POSTCHANGE && delta_f < 0) ||
734 (val == CPUFREQ_PRECHANGE && delta_f > 0)) {
735 spin_lock_irqsave(&i2c->lock, flags);
736 ret = s3c24xx_i2c_clockrate(i2c, &got);
737 spin_unlock_irqrestore(&i2c->lock, flags);
738
739 if (ret < 0)
740 dev_err(i2c->dev, "cannot find frequency\n");
741 else
742 dev_info(i2c->dev, "setting freq %d\n", got);
743 }
744
745 return 0;
746}
747
748static inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c)
749{
750 i2c->freq_transition.notifier_call = s3c24xx_i2c_cpufreq_transition;
751
752 return cpufreq_register_notifier(&i2c->freq_transition,
753 CPUFREQ_TRANSITION_NOTIFIER);
754}
755
756static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
757{
758 cpufreq_unregister_notifier(&i2c->freq_transition,
759 CPUFREQ_TRANSITION_NOTIFIER);
760}
761
762#else
763static inline int s3c24xx_i2c_register_cpufreq(struct s3c24xx_i2c *i2c)
764{
765 return 0;
766}
767
768static inline void s3c24xx_i2c_deregister_cpufreq(struct s3c24xx_i2c *i2c)
769{
770}
771#endif
772
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773/* s3c24xx_i2c_init
774 *
Ben Dooks3d0911b2008-10-31 16:10:24 +0000775 * initialise the controller, set the IO lines and frequency
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776*/
777
778static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
779{
780 unsigned long iicon = S3C2410_IICCON_IRQEN | S3C2410_IICCON_ACKEN;
781 struct s3c2410_platform_i2c *pdata;
782 unsigned int freq;
783
784 /* get the plafrom data */
785
786 pdata = s3c24xx_i2c_get_platformdata(i2c->adap.dev.parent);
787
788 /* inititalise the gpio */
789
790 s3c2410_gpio_cfgpin(S3C2410_GPE15, S3C2410_GPE15_IICSDA);
791 s3c2410_gpio_cfgpin(S3C2410_GPE14, S3C2410_GPE14_IICSCL);
792
793 /* write slave address */
Ben Dooks3d0911b2008-10-31 16:10:24 +0000794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 writeb(pdata->slave_addr, i2c->regs + S3C2410_IICADD);
796
797 dev_info(i2c->dev, "slave address 0x%02x\n", pdata->slave_addr);
798
Ben Dooks61c7cff2008-07-28 12:04:07 +0100799 writel(iicon, i2c->regs + S3C2410_IICCON);
800
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 /* we need to work out the divisors for the clock... */
802
Ben Dooks61c7cff2008-07-28 12:04:07 +0100803 if (s3c24xx_i2c_clockrate(i2c, &freq) != 0) {
804 writel(0, i2c->regs + S3C2410_IICCON);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 dev_err(i2c->dev, "cannot meet bus frequency required\n");
806 return -EINVAL;
807 }
808
809 /* todo - check that the i2c lines aren't being dragged anywhere */
810
811 dev_info(i2c->dev, "bus frequency set to %d KHz\n", freq);
812 dev_dbg(i2c->dev, "S3C2410_IICCON=0x%02lx\n", iicon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 /* check for s3c2440 i2c controller */
815
816 if (s3c24xx_i2c_is2440(i2c)) {
817 dev_dbg(i2c->dev, "S3C2440_IICLC=%08x\n", pdata->sda_delay);
818
819 writel(pdata->sda_delay, i2c->regs + S3C2440_IICLC);
820 }
821
822 return 0;
823}
824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825/* s3c24xx_i2c_probe
826 *
827 * called by the bus driver when a suitable device is found
828*/
829
Russell King3ae5eae2005-11-09 22:32:44 +0000830static int s3c24xx_i2c_probe(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 struct s3c24xx_i2c *i2c = &s3c24xx_i2c;
Ben Dooks399dee22008-07-28 12:04:06 +0100833 struct s3c2410_platform_i2c *pdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 struct resource *res;
835 int ret;
836
Ben Dooks399dee22008-07-28 12:04:06 +0100837 pdata = s3c24xx_i2c_get_platformdata(&pdev->dev);
838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 /* find the clock and enable it */
840
Russell King3ae5eae2005-11-09 22:32:44 +0000841 i2c->dev = &pdev->dev;
842 i2c->clk = clk_get(&pdev->dev, "i2c");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 if (IS_ERR(i2c->clk)) {
Russell King3ae5eae2005-11-09 22:32:44 +0000844 dev_err(&pdev->dev, "cannot get clock\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 ret = -ENOENT;
Ben Dooks5b687902007-05-01 23:26:35 +0200846 goto err_noclk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 }
848
Russell King3ae5eae2005-11-09 22:32:44 +0000849 dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 clk_enable(i2c->clk);
852
853 /* map the registers */
854
855 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
856 if (res == NULL) {
Russell King3ae5eae2005-11-09 22:32:44 +0000857 dev_err(&pdev->dev, "cannot find IO resource\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 ret = -ENOENT;
Ben Dooks5b687902007-05-01 23:26:35 +0200859 goto err_clk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 }
861
862 i2c->ioarea = request_mem_region(res->start, (res->end-res->start)+1,
863 pdev->name);
864
865 if (i2c->ioarea == NULL) {
Russell King3ae5eae2005-11-09 22:32:44 +0000866 dev_err(&pdev->dev, "cannot request IO\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 ret = -ENXIO;
Ben Dooks5b687902007-05-01 23:26:35 +0200868 goto err_clk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 }
870
871 i2c->regs = ioremap(res->start, (res->end-res->start)+1);
872
873 if (i2c->regs == NULL) {
Russell King3ae5eae2005-11-09 22:32:44 +0000874 dev_err(&pdev->dev, "cannot map IO\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 ret = -ENXIO;
Ben Dooks5b687902007-05-01 23:26:35 +0200876 goto err_ioarea;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 }
878
Ben Dooks3d0911b2008-10-31 16:10:24 +0000879 dev_dbg(&pdev->dev, "registers %p (%p, %p)\n",
880 i2c->regs, i2c->ioarea, res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
882 /* setup info block for the i2c core */
883
884 i2c->adap.algo_data = i2c;
Russell King3ae5eae2005-11-09 22:32:44 +0000885 i2c->adap.dev.parent = &pdev->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
887 /* initialise the i2c controller */
888
889 ret = s3c24xx_i2c_init(i2c);
890 if (ret != 0)
Ben Dooks5b687902007-05-01 23:26:35 +0200891 goto err_iomap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
893 /* find the IRQ for this unit (note, this relies on the init call to
Ben Dooks3d0911b2008-10-31 16:10:24 +0000894 * ensure no current IRQs pending
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 */
896
897 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
898 if (res == NULL) {
Russell King3ae5eae2005-11-09 22:32:44 +0000899 dev_err(&pdev->dev, "cannot find IRQ\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 ret = -ENOENT;
Ben Dooks5b687902007-05-01 23:26:35 +0200901 goto err_iomap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 }
903
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700904 ret = request_irq(res->start, s3c24xx_i2c_irq, IRQF_DISABLED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 pdev->name, i2c);
906
907 if (ret != 0) {
Russell King3ae5eae2005-11-09 22:32:44 +0000908 dev_err(&pdev->dev, "cannot claim IRQ\n");
Ben Dooks5b687902007-05-01 23:26:35 +0200909 goto err_iomap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 }
911
912 i2c->irq = res;
Ben Dooks3d0911b2008-10-31 16:10:24 +0000913
Arnaud Patarda1ba1582007-05-22 19:49:16 +0200914 dev_dbg(&pdev->dev, "irq resource %p (%lu)\n", res,
915 (unsigned long)res->start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
Ben Dooks61c7cff2008-07-28 12:04:07 +0100917 ret = s3c24xx_i2c_register_cpufreq(i2c);
918 if (ret < 0) {
919 dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
920 goto err_irq;
921 }
922
Ben Dooks399dee22008-07-28 12:04:06 +0100923 /* Note, previous versions of the driver used i2c_add_adapter()
924 * to add the bus at any number. We now pass the bus number via
925 * the platform data, so if unset it will now default to always
926 * being bus 0.
927 */
928
929 i2c->adap.nr = pdata->bus_num;
930
931 ret = i2c_add_numbered_adapter(&i2c->adap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 if (ret < 0) {
Russell King3ae5eae2005-11-09 22:32:44 +0000933 dev_err(&pdev->dev, "failed to add bus to i2c core\n");
Ben Dooks61c7cff2008-07-28 12:04:07 +0100934 goto err_cpufreq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 }
936
Russell King3ae5eae2005-11-09 22:32:44 +0000937 platform_set_drvdata(pdev, i2c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
Russell King3ae5eae2005-11-09 22:32:44 +0000939 dev_info(&pdev->dev, "%s: S3C I2C adapter\n", i2c->adap.dev.bus_id);
Ben Dooks5b687902007-05-01 23:26:35 +0200940 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
Ben Dooks61c7cff2008-07-28 12:04:07 +0100942 err_cpufreq:
943 s3c24xx_i2c_deregister_cpufreq(i2c);
944
Ben Dooks5b687902007-05-01 23:26:35 +0200945 err_irq:
946 free_irq(i2c->irq->start, i2c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Ben Dooks5b687902007-05-01 23:26:35 +0200948 err_iomap:
949 iounmap(i2c->regs);
950
951 err_ioarea:
952 release_resource(i2c->ioarea);
953 kfree(i2c->ioarea);
954
955 err_clk:
956 clk_disable(i2c->clk);
957 clk_put(i2c->clk);
958
959 err_noclk:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 return ret;
961}
962
963/* s3c24xx_i2c_remove
964 *
965 * called when device is removed from the bus
966*/
967
Russell King3ae5eae2005-11-09 22:32:44 +0000968static int s3c24xx_i2c_remove(struct platform_device *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969{
Russell King3ae5eae2005-11-09 22:32:44 +0000970 struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
Ben Dooks5b687902007-05-01 23:26:35 +0200971
Ben Dooks61c7cff2008-07-28 12:04:07 +0100972 s3c24xx_i2c_deregister_cpufreq(i2c);
973
Ben Dooks5b687902007-05-01 23:26:35 +0200974 i2c_del_adapter(&i2c->adap);
975 free_irq(i2c->irq->start, i2c);
976
977 clk_disable(i2c->clk);
978 clk_put(i2c->clk);
979
980 iounmap(i2c->regs);
981
982 release_resource(i2c->ioarea);
983 kfree(i2c->ioarea);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985 return 0;
986}
987
988#ifdef CONFIG_PM
Russell King3ae5eae2005-11-09 22:32:44 +0000989static int s3c24xx_i2c_resume(struct platform_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990{
Russell King3ae5eae2005-11-09 22:32:44 +0000991 struct s3c24xx_i2c *i2c = platform_get_drvdata(dev);
Russell King9480e302005-10-28 09:52:56 -0700992
993 if (i2c != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 s3c24xx_i2c_init(i2c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
996 return 0;
997}
998
999#else
1000#define s3c24xx_i2c_resume NULL
1001#endif
1002
1003/* device driver for platform bus bits */
1004
Russell King3ae5eae2005-11-09 22:32:44 +00001005static struct platform_driver s3c2410_i2c_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 .probe = s3c24xx_i2c_probe,
1007 .remove = s3c24xx_i2c_remove,
1008 .resume = s3c24xx_i2c_resume,
Russell King3ae5eae2005-11-09 22:32:44 +00001009 .driver = {
1010 .owner = THIS_MODULE,
1011 .name = "s3c2410-i2c",
1012 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013};
1014
Russell King3ae5eae2005-11-09 22:32:44 +00001015static struct platform_driver s3c2440_i2c_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 .probe = s3c24xx_i2c_probe,
1017 .remove = s3c24xx_i2c_remove,
1018 .resume = s3c24xx_i2c_resume,
Russell King3ae5eae2005-11-09 22:32:44 +00001019 .driver = {
1020 .owner = THIS_MODULE,
1021 .name = "s3c2440-i2c",
1022 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023};
1024
1025static int __init i2c_adap_s3c_init(void)
1026{
1027 int ret;
1028
Russell King3ae5eae2005-11-09 22:32:44 +00001029 ret = platform_driver_register(&s3c2410_i2c_driver);
Russell Kinge32e28e2005-10-30 16:32:27 +00001030 if (ret == 0) {
Russell King3ae5eae2005-11-09 22:32:44 +00001031 ret = platform_driver_register(&s3c2440_i2c_driver);
Russell Kinge32e28e2005-10-30 16:32:27 +00001032 if (ret)
Russell King3ae5eae2005-11-09 22:32:44 +00001033 platform_driver_unregister(&s3c2410_i2c_driver);
Russell Kinge32e28e2005-10-30 16:32:27 +00001034 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
1036 return ret;
1037}
1038
1039static void __exit i2c_adap_s3c_exit(void)
1040{
Russell King3ae5eae2005-11-09 22:32:44 +00001041 platform_driver_unregister(&s3c2410_i2c_driver);
1042 platform_driver_unregister(&s3c2440_i2c_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043}
1044
1045module_init(i2c_adap_s3c_init);
1046module_exit(i2c_adap_s3c_exit);
1047
1048MODULE_DESCRIPTION("S3C24XX I2C Bus driver");
1049MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
1050MODULE_LICENSE("GPL");
Kay Sieversadd8eda2008-04-22 22:16:49 +02001051MODULE_ALIAS("platform:s3c2410-i2c");
Ben Dooksd150a4b2008-07-01 11:59:43 +01001052MODULE_ALIAS("platform:s3c2440-i2c");