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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / i2c / busses / i2c-mv64xxx.c
blob5b852782d2f5956cc4984a617facd1da2e64f592
1 /*
2 * drivers/i2c/busses/i2c-mv64xxx.c
3 *
4 * Driver for the i2c controller on the Marvell line of host bridges for MIPS
5 * and PPC (e.g, gt642[46]0, mv643[46]0, mv644[46]0).
6 *
7 * Author: Mark A. Greer <mgreer@mvista.com>
8 *
9 * 2005 (c) MontaVista, Software, Inc. This file is licensed under
10 * the terms of the GNU General Public License version 2. This program
11 * is licensed "as is" without any warranty of any kind, whether express
12 * or implied.
13 */
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/spinlock.h>
17 #include <linux/i2c.h>
18 #include <linux/interrupt.h>
19 #include <linux/mv643xx.h>
20 #include <asm/io.h>
21
22 /* Register defines */
23 #define MV64XXX_I2C_REG_SLAVE_ADDR 0x00
24 #define MV64XXX_I2C_REG_DATA 0x04
25 #define MV64XXX_I2C_REG_CONTROL 0x08
26 #define MV64XXX_I2C_REG_STATUS 0x0c
27 #define MV64XXX_I2C_REG_BAUD 0x0c
28 #define MV64XXX_I2C_REG_EXT_SLAVE_ADDR 0x10
29 #define MV64XXX_I2C_REG_SOFT_RESET 0x1c
30
31 #define MV64XXX_I2C_REG_CONTROL_ACK 0x00000004
32 #define MV64XXX_I2C_REG_CONTROL_IFLG 0x00000008
33 #define MV64XXX_I2C_REG_CONTROL_STOP 0x00000010
34 #define MV64XXX_I2C_REG_CONTROL_START 0x00000020
35 #define MV64XXX_I2C_REG_CONTROL_TWSIEN 0x00000040
36 #define MV64XXX_I2C_REG_CONTROL_INTEN 0x00000080
37
38 /* Ctlr status values */
39 #define MV64XXX_I2C_STATUS_BUS_ERR 0x00
40 #define MV64XXX_I2C_STATUS_MAST_START 0x08
41 #define MV64XXX_I2C_STATUS_MAST_REPEAT_START 0x10
42 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK 0x18
43 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK 0x20
44 #define MV64XXX_I2C_STATUS_MAST_WR_ACK 0x28
45 #define MV64XXX_I2C_STATUS_MAST_WR_NO_ACK 0x30
46 #define MV64XXX_I2C_STATUS_MAST_LOST_ARB 0x38
47 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK 0x40
48 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK 0x48
49 #define MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK 0x50
50 #define MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK 0x58
51 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK 0xd0
52 #define MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_NO_ACK 0xd8
53 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK 0xe0
54 #define MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_NO_ACK 0xe8
55 #define MV64XXX_I2C_STATUS_NO_STATUS 0xf8
56
57 /* Driver states */
58 enum {
59 MV64XXX_I2C_STATE_INVALID,
60 MV64XXX_I2C_STATE_IDLE,
61 MV64XXX_I2C_STATE_WAITING_FOR_START_COND,
62 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK,
63 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK,
64 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK,
65 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA,
66 MV64XXX_I2C_STATE_ABORTING,
67 };
68
69 /* Driver actions */
70 enum {
71 MV64XXX_I2C_ACTION_INVALID,
72 MV64XXX_I2C_ACTION_CONTINUE,
73 MV64XXX_I2C_ACTION_SEND_START,
74 MV64XXX_I2C_ACTION_SEND_ADDR_1,
75 MV64XXX_I2C_ACTION_SEND_ADDR_2,
76 MV64XXX_I2C_ACTION_SEND_DATA,
77 MV64XXX_I2C_ACTION_RCV_DATA,
78 MV64XXX_I2C_ACTION_RCV_DATA_STOP,
79 MV64XXX_I2C_ACTION_SEND_STOP,
80 };
81
82 struct mv64xxx_i2c_data {
83 int irq;
84 u32 state;
85 u32 action;
86 u32 cntl_bits;
87 void __iomem *reg_base;
88 u32 reg_base_p;
89 u32 addr1;
90 u32 addr2;
91 u32 bytes_left;
92 u32 byte_posn;
93 u32 block;
94 int rc;
95 u32 freq_m;
96 u32 freq_n;
97 wait_queue_head_t waitq;
98 spinlock_t lock;
99 struct i2c_msg *msg;
100 struct i2c_adapter adapter;
101 };
102
103 /*
104 *****************************************************************************
105 *
106 * Finite State Machine & Interrupt Routines
107 *
108 *****************************************************************************
109 */
110 static void
111 mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
112 {
113 /*
114 * If state is idle, then this is likely the remnants of an old
115 * operation that driver has given up on or the user has killed.
116 * If so, issue the stop condition and go to idle.
117 */
118 if (drv_data->state == MV64XXX_I2C_STATE_IDLE) {
119 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
120 return;
121 }
122
123 if (drv_data->state == MV64XXX_I2C_STATE_ABORTING) {
124 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
125 drv_data->state = MV64XXX_I2C_STATE_IDLE;
126 return;
127 }
128
129 /* The status from the ctlr [mostly] tells us what to do next */
130 switch (status) {
131 /* Start condition interrupt */
132 case MV64XXX_I2C_STATUS_MAST_START: /* 0x08 */
133 case MV64XXX_I2C_STATUS_MAST_REPEAT_START: /* 0x10 */
134 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1;
135 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK;
136 break;
137
138 /* Performing a write */
139 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK: /* 0x18 */
140 if (drv_data->msg->flags & I2C_M_TEN) {
141 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
142 drv_data->state =
143 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
144 break;
145 }
146 /* FALLTHRU */
147 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */
148 case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */
149 if (drv_data->bytes_left > 0) {
150 drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
151 drv_data->state =
152 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
153 drv_data->bytes_left--;
154 } else {
155 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
156 drv_data->state = MV64XXX_I2C_STATE_IDLE;
157 }
158 break;
159
160 /* Performing a read */
161 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK: /* 40 */
162 if (drv_data->msg->flags & I2C_M_TEN) {
163 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
164 drv_data->state =
165 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
166 break;
167 }
168 /* FALLTHRU */
169 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK: /* 0xe0 */
170 if (drv_data->bytes_left == 0) {
171 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
172 drv_data->state = MV64XXX_I2C_STATE_IDLE;
173 break;
174 }
175 /* FALLTHRU */
176 case MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK: /* 0x50 */
177 if (status != MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK)
178 drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
179 else {
180 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA;
181 drv_data->bytes_left--;
182 }
183 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
184
185 if (drv_data->bytes_left == 1)
186 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK;
187 break;
188
189 case MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */
190 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA_STOP;
191 drv_data->state = MV64XXX_I2C_STATE_IDLE;
192 break;
193
194 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK: /* 0x20 */
195 case MV64XXX_I2C_STATUS_MAST_WR_NO_ACK: /* 30 */
196 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK: /* 48 */
197 /* Doesn't seem to be a device at other end */
198 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
199 drv_data->state = MV64XXX_I2C_STATE_IDLE;
200 drv_data->rc = -ENODEV;
201 break;
202
203 default:
204 dev_err(&drv_data->adapter.dev,
205 "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, "
206 "status: 0x%x, addr: 0x%x, flags: 0x%x\n",
207 drv_data->state, status, drv_data->msg->addr,
208 drv_data->msg->flags);
209 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
210 drv_data->state = MV64XXX_I2C_STATE_IDLE;
211 drv_data->rc = -EIO;
212 }
213 }
214
215 static void
216 mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
217 {
218 switch(drv_data->action) {
219 case MV64XXX_I2C_ACTION_CONTINUE:
220 writel(drv_data->cntl_bits,
221 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
222 break;
223
224 case MV64XXX_I2C_ACTION_SEND_START:
225 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
226 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
227 break;
228
229 case MV64XXX_I2C_ACTION_SEND_ADDR_1:
230 writel(drv_data->addr1,
231 drv_data->reg_base + MV64XXX_I2C_REG_DATA);
232 writel(drv_data->cntl_bits,
233 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
234 break;
235
236 case MV64XXX_I2C_ACTION_SEND_ADDR_2:
237 writel(drv_data->addr2,
238 drv_data->reg_base + MV64XXX_I2C_REG_DATA);
239 writel(drv_data->cntl_bits,
240 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
241 break;
242
243 case MV64XXX_I2C_ACTION_SEND_DATA:
244 writel(drv_data->msg->buf[drv_data->byte_posn++],
245 drv_data->reg_base + MV64XXX_I2C_REG_DATA);
246 writel(drv_data->cntl_bits,
247 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
248 break;
249
250 case MV64XXX_I2C_ACTION_RCV_DATA:
251 drv_data->msg->buf[drv_data->byte_posn++] =
252 readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
253 writel(drv_data->cntl_bits,
254 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
255 break;
256
257 case MV64XXX_I2C_ACTION_RCV_DATA_STOP:
258 drv_data->msg->buf[drv_data->byte_posn++] =
259 readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
260 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
261 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
262 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
263 drv_data->block = 0;
264 wake_up_interruptible(&drv_data->waitq);
265 break;
266
267 case MV64XXX_I2C_ACTION_INVALID:
268 default:
269 dev_err(&drv_data->adapter.dev,
270 "mv64xxx_i2c_do_action: Invalid action: %d\n",
271 drv_data->action);
272 drv_data->rc = -EIO;
273 /* FALLTHRU */
274 case MV64XXX_I2C_ACTION_SEND_STOP:
275 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
276 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
277 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
278 drv_data->block = 0;
279 wake_up_interruptible(&drv_data->waitq);
280 break;
281 }
282 }
283
284 static int
285 mv64xxx_i2c_intr(int irq, void *dev_id, struct pt_regs *regs)
286 {
287 struct mv64xxx_i2c_data *drv_data = dev_id;
288 unsigned long flags;
289 u32 status;
290 int rc = IRQ_NONE;
291
292 spin_lock_irqsave(&drv_data->lock, flags);
293 while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) &
294 MV64XXX_I2C_REG_CONTROL_IFLG) {
295 status = readl(drv_data->reg_base + MV64XXX_I2C_REG_STATUS);
296 mv64xxx_i2c_fsm(drv_data, status);
297 mv64xxx_i2c_do_action(drv_data);
298 rc = IRQ_HANDLED;
299 }
300 spin_unlock_irqrestore(&drv_data->lock, flags);
301
302 return rc;
303 }
304
305 /*
306 *****************************************************************************
307 *
308 * I2C Msg Execution Routines
309 *
310 *****************************************************************************
311 */
312 static void
313 mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data,
314 struct i2c_msg *msg)
315 {
316 u32 dir = 0;
317
318 drv_data->msg = msg;
319 drv_data->byte_posn = 0;
320 drv_data->bytes_left = msg->len;
321 drv_data->rc = 0;
322 drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK |
323 MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN;
324
325 if (msg->flags & I2C_M_RD)
326 dir = 1;
327
328 if (msg->flags & I2C_M_REV_DIR_ADDR)
329 dir ^= 1;
330
331 if (msg->flags & I2C_M_TEN) {
332 drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir;
333 drv_data->addr2 = (u32)msg->addr & 0xff;
334 } else {
335 drv_data->addr1 = ((u32)msg->addr & 0x7f) << 1 | dir;
336 drv_data->addr2 = 0;
337 }
338 }
339
340 static void
341 mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data)
342 {
343 long time_left;
344 unsigned long flags;
345 char abort = 0;
346
347 time_left = wait_event_interruptible_timeout(drv_data->waitq,
348 !drv_data->block, msecs_to_jiffies(drv_data->adapter.timeout));
349
350 spin_lock_irqsave(&drv_data->lock, flags);
351 if (!time_left) { /* Timed out */
352 drv_data->rc = -ETIMEDOUT;
353 abort = 1;
354 } else if (time_left < 0) { /* Interrupted/Error */
355 drv_data->rc = time_left; /* errno value */
356 abort = 1;
357 }
358
359 if (abort && drv_data->block) {
360 drv_data->state = MV64XXX_I2C_STATE_ABORTING;
361 spin_unlock_irqrestore(&drv_data->lock, flags);
362
363 time_left = wait_event_timeout(drv_data->waitq,
364 !drv_data->block,
365 msecs_to_jiffies(drv_data->adapter.timeout));
366
367 if (time_left <= 0) {
368 drv_data->state = MV64XXX_I2C_STATE_IDLE;
369 dev_err(&drv_data->adapter.dev,
370 "mv64xxx: I2C bus locked\n");
371 }
372 } else
373 spin_unlock_irqrestore(&drv_data->lock, flags);
374 }
375
376 static int
377 mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg)
378 {
379 unsigned long flags;
380
381 spin_lock_irqsave(&drv_data->lock, flags);
382 mv64xxx_i2c_prepare_for_io(drv_data, msg);
383
384 if (unlikely(msg->flags & I2C_M_NOSTART)) { /* Skip start/addr phases */
385 if (drv_data->msg->flags & I2C_M_RD) {
386 /* No action to do, wait for slave to send a byte */
387 drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
388 drv_data->state =
389 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
390 } else {
391 drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
392 drv_data->state =
393 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
394 drv_data->bytes_left--;
395 }
396 } else {
397 drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
398 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
399 }
400
401 drv_data->block = 1;
402 mv64xxx_i2c_do_action(drv_data);
403 spin_unlock_irqrestore(&drv_data->lock, flags);
404
405 mv64xxx_i2c_wait_for_completion(drv_data);
406 return drv_data->rc;
407 }
408
409 /*
410 *****************************************************************************
411 *
412 * I2C Core Support Routines (Interface to higher level I2C code)
413 *
414 *****************************************************************************
415 */
416 static u32
417 mv64xxx_i2c_functionality(struct i2c_adapter *adap)
418 {
419 return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
420 }
421
422 static int
423 mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
424 {
425 struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
426 int i, rc = 0;
427
428 for (i=0; i<num; i++)
429 if ((rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i])) != 0)
430 break;
431
432 return rc;
433 }
434
435 static struct i2c_algorithm mv64xxx_i2c_algo = {
436 .name = MV64XXX_I2C_CTLR_NAME " algorithm",
437 .id = I2C_ALGO_MV64XXX,
438 .master_xfer = mv64xxx_i2c_xfer,
439 .functionality = mv64xxx_i2c_functionality,
440 };
441
442 /*
443 *****************************************************************************
444 *
445 * Driver Interface & Early Init Routines
446 *
447 *****************************************************************************
448 */
449 static void __devinit
450 mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data)
451 {
452 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET);
453 writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)),
454 drv_data->reg_base + MV64XXX_I2C_REG_BAUD);
455 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR);
456 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR);
457 writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP,
458 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
459 drv_data->state = MV64XXX_I2C_STATE_IDLE;
460 }
461
462 static int __devinit
463 mv64xxx_i2c_map_regs(struct platform_device *pd,
464 struct mv64xxx_i2c_data *drv_data)
465 {
466 struct resource *r;
467
468 if ((r = platform_get_resource(pd, IORESOURCE_MEM, 0)) &&
469 request_mem_region(r->start, MV64XXX_I2C_REG_BLOCK_SIZE,
470 drv_data->adapter.name)) {
471
472 drv_data->reg_base = ioremap(r->start,
473 MV64XXX_I2C_REG_BLOCK_SIZE);
474 drv_data->reg_base_p = r->start;
475 } else
476 return -ENOMEM;
477
478 return 0;
479 }
480
481 static void __devexit
482 mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data)
483 {
484 if (drv_data->reg_base) {
485 iounmap(drv_data->reg_base);
486 release_mem_region(drv_data->reg_base_p,
487 MV64XXX_I2C_REG_BLOCK_SIZE);
488 }
489
490 drv_data->reg_base = NULL;
491 drv_data->reg_base_p = 0;
492 }
493
494 static int __devinit
495 mv64xxx_i2c_probe(struct device *dev)
496 {
497 struct platform_device *pd = to_platform_device(dev);
498 struct mv64xxx_i2c_data *drv_data;
499 struct mv64xxx_i2c_pdata *pdata = dev->platform_data;
500 int rc;
501
502 if ((pd->id != 0) || !pdata)
503 return -ENODEV;
504
505 drv_data = kmalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
506
507 if (!drv_data)
508 return -ENOMEM;
509
510 memset(drv_data, 0, sizeof(struct mv64xxx_i2c_data));
511
512 if (mv64xxx_i2c_map_regs(pd, drv_data)) {
513 rc = -ENODEV;
514 goto exit_kfree;
515 }
516
517 strncpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
518 I2C_NAME_SIZE);
519
520 init_waitqueue_head(&drv_data->waitq);
521 spin_lock_init(&drv_data->lock);
522
523 drv_data->freq_m = pdata->freq_m;
524 drv_data->freq_n = pdata->freq_n;
525 drv_data->irq = platform_get_irq(pd, 0);
526 drv_data->adapter.id = I2C_ALGO_MV64XXX | I2C_HW_MV64XXX;
527 drv_data->adapter.algo = &mv64xxx_i2c_algo;
528 drv_data->adapter.owner = THIS_MODULE;
529 drv_data->adapter.class = I2C_CLASS_HWMON;
530 drv_data->adapter.timeout = pdata->timeout;
531 drv_data->adapter.retries = pdata->retries;
532 dev_set_drvdata(dev, drv_data);
533 i2c_set_adapdata(&drv_data->adapter, drv_data);
534
535 if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
536 MV64XXX_I2C_CTLR_NAME, drv_data)) {
537
538 dev_err(dev, "mv64xxx: Can't register intr handler "
539 "irq: %d\n", drv_data->irq);
540 rc = -EINVAL;
541 goto exit_unmap_regs;
542 } else if ((rc = i2c_add_adapter(&drv_data->adapter)) != 0) {
543 dev_err(dev, "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
544 goto exit_free_irq;
545 }
546
547 mv64xxx_i2c_hw_init(drv_data);
548
549 return 0;
550
551 exit_free_irq:
552 free_irq(drv_data->irq, drv_data);
553 exit_unmap_regs:
554 mv64xxx_i2c_unmap_regs(drv_data);
555 exit_kfree:
556 kfree(drv_data);
557 return rc;
558 }
559
560 static int __devexit
561 mv64xxx_i2c_remove(struct device *dev)
562 {
563 struct mv64xxx_i2c_data *drv_data = dev_get_drvdata(dev);
564 int rc;
565
566 rc = i2c_del_adapter(&drv_data->adapter);
567 free_irq(drv_data->irq, drv_data);
568 mv64xxx_i2c_unmap_regs(drv_data);
569 kfree(drv_data);
570
571 return rc;
572 }
573
574 static struct device_driver mv64xxx_i2c_driver = {
575 .name = MV64XXX_I2C_CTLR_NAME,
576 .bus = &platform_bus_type,
577 .probe = mv64xxx_i2c_probe,
578 .remove = mv64xxx_i2c_remove,
579 };
580
581 static int __init
582 mv64xxx_i2c_init(void)
583 {
584 return driver_register(&mv64xxx_i2c_driver);
585 }
586
587 static void __exit
588 mv64xxx_i2c_exit(void)
589 {
590 driver_unregister(&mv64xxx_i2c_driver);
591 }
592
593 module_init(mv64xxx_i2c_init);
594 module_exit(mv64xxx_i2c_exit);
595
596 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
597 MODULE_DESCRIPTION("Marvell mv64xxx host bridge i2c ctlr driver");
598 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree