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hwmon: (pmbus) Drop check for PMBus revision register in probe function
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / i2c / busses / i2c-mv64xxx.c
bloba9941c65f226758d2992bb123fd0b5b2ead759dd
1 /*
2 * Driver for the i2c controller on the Marvell line of host bridges
3 * (e.g, gt642[46]0, mv643[46]0, mv644[46]0, and Orion SoC family).
4 *
5 * Author: Mark A. Greer <mgreer@mvista.com>
6 *
7 * 2005 (c) MontaVista, Software, Inc. This file is licensed under
8 * the terms of the GNU General Public License version 2. This program
9 * is licensed "as is" without any warranty of any kind, whether express
10 * or implied.
11 */
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/spinlock.h>
16 #include <linux/i2c.h>
17 #include <linux/interrupt.h>
18 #include <linux/mv643xx_i2c.h>
19 #include <linux/platform_device.h>
20 #include <linux/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_RESTART,
63 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK,
64 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK,
65 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK,
66 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA,
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_RESTART,
75 MV64XXX_I2C_ACTION_SEND_ADDR_1,
76 MV64XXX_I2C_ACTION_SEND_ADDR_2,
77 MV64XXX_I2C_ACTION_SEND_DATA,
78 MV64XXX_I2C_ACTION_RCV_DATA,
79 MV64XXX_I2C_ACTION_RCV_DATA_STOP,
80 MV64XXX_I2C_ACTION_SEND_STOP,
81 };
82
83 struct mv64xxx_i2c_data {
84 int irq;
85 u32 state;
86 u32 action;
87 u32 aborting;
88 u32 cntl_bits;
89 void __iomem *reg_base;
90 u32 reg_base_p;
91 u32 reg_size;
92 u32 addr1;
93 u32 addr2;
94 u32 bytes_left;
95 u32 byte_posn;
96 u32 send_stop;
97 u32 block;
98 int rc;
99 u32 freq_m;
100 u32 freq_n;
101 wait_queue_head_t waitq;
102 spinlock_t lock;
103 struct i2c_msg *msg;
104 struct i2c_adapter adapter;
105 };
106
107 /*
108 *****************************************************************************
109 *
110 * Finite State Machine & Interrupt Routines
111 *
112 *****************************************************************************
113 */
114
115 /* Reset hardware and initialize FSM */
116 static void
117 mv64xxx_i2c_hw_init(struct mv64xxx_i2c_data *drv_data)
118 {
119 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SOFT_RESET);
120 writel((((drv_data->freq_m & 0xf) << 3) | (drv_data->freq_n & 0x7)),
121 drv_data->reg_base + MV64XXX_I2C_REG_BAUD);
122 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_SLAVE_ADDR);
123 writel(0, drv_data->reg_base + MV64XXX_I2C_REG_EXT_SLAVE_ADDR);
124 writel(MV64XXX_I2C_REG_CONTROL_TWSIEN | MV64XXX_I2C_REG_CONTROL_STOP,
125 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
126 drv_data->state = MV64XXX_I2C_STATE_IDLE;
127 }
128
129 static void
130 mv64xxx_i2c_fsm(struct mv64xxx_i2c_data *drv_data, u32 status)
131 {
132 /*
133 * If state is idle, then this is likely the remnants of an old
134 * operation that driver has given up on or the user has killed.
135 * If so, issue the stop condition and go to idle.
136 */
137 if (drv_data->state == MV64XXX_I2C_STATE_IDLE) {
138 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
139 return;
140 }
141
142 /* The status from the ctlr [mostly] tells us what to do next */
143 switch (status) {
144 /* Start condition interrupt */
145 case MV64XXX_I2C_STATUS_MAST_START: /* 0x08 */
146 case MV64XXX_I2C_STATUS_MAST_REPEAT_START: /* 0x10 */
147 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1;
148 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK;
149 break;
150
151 /* Performing a write */
152 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_ACK: /* 0x18 */
153 if (drv_data->msg->flags & I2C_M_TEN) {
154 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
155 drv_data->state =
156 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
157 break;
158 }
159 /* FALLTHRU */
160 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_2_ACK: /* 0xd0 */
161 case MV64XXX_I2C_STATUS_MAST_WR_ACK: /* 0x28 */
162 if ((drv_data->bytes_left == 0)
163 || (drv_data->aborting
164 && (drv_data->byte_posn != 0))) {
165 if (drv_data->send_stop) {
166 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
167 drv_data->state = MV64XXX_I2C_STATE_IDLE;
168 } else {
169 drv_data->action =
170 MV64XXX_I2C_ACTION_SEND_RESTART;
171 drv_data->state =
172 MV64XXX_I2C_STATE_WAITING_FOR_RESTART;
173 }
174 } else {
175 drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
176 drv_data->state =
177 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
178 drv_data->bytes_left--;
179 }
180 break;
181
182 /* Performing a read */
183 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_ACK: /* 40 */
184 if (drv_data->msg->flags & I2C_M_TEN) {
185 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_2;
186 drv_data->state =
187 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_2_ACK;
188 break;
189 }
190 /* FALLTHRU */
191 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_2_ACK: /* 0xe0 */
192 if (drv_data->bytes_left == 0) {
193 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
194 drv_data->state = MV64XXX_I2C_STATE_IDLE;
195 break;
196 }
197 /* FALLTHRU */
198 case MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK: /* 0x50 */
199 if (status != MV64XXX_I2C_STATUS_MAST_RD_DATA_ACK)
200 drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
201 else {
202 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA;
203 drv_data->bytes_left--;
204 }
205 drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
206
207 if ((drv_data->bytes_left == 1) || drv_data->aborting)
208 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_ACK;
209 break;
210
211 case MV64XXX_I2C_STATUS_MAST_RD_DATA_NO_ACK: /* 0x58 */
212 drv_data->action = MV64XXX_I2C_ACTION_RCV_DATA_STOP;
213 drv_data->state = MV64XXX_I2C_STATE_IDLE;
214 break;
215
216 case MV64XXX_I2C_STATUS_MAST_WR_ADDR_NO_ACK: /* 0x20 */
217 case MV64XXX_I2C_STATUS_MAST_WR_NO_ACK: /* 30 */
218 case MV64XXX_I2C_STATUS_MAST_RD_ADDR_NO_ACK: /* 48 */
219 /* Doesn't seem to be a device at other end */
220 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
221 drv_data->state = MV64XXX_I2C_STATE_IDLE;
222 drv_data->rc = -ENODEV;
223 break;
224
225 default:
226 dev_err(&drv_data->adapter.dev,
227 "mv64xxx_i2c_fsm: Ctlr Error -- state: 0x%x, "
228 "status: 0x%x, addr: 0x%x, flags: 0x%x\n",
229 drv_data->state, status, drv_data->msg->addr,
230 drv_data->msg->flags);
231 drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
232 mv64xxx_i2c_hw_init(drv_data);
233 drv_data->rc = -EIO;
234 }
235 }
236
237 static void
238 mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
239 {
240 switch(drv_data->action) {
241 case MV64XXX_I2C_ACTION_SEND_RESTART:
242 drv_data->cntl_bits |= MV64XXX_I2C_REG_CONTROL_START;
243 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
244 writel(drv_data->cntl_bits,
245 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
246 drv_data->block = 0;
247 wake_up_interruptible(&drv_data->waitq);
248 break;
249
250 case MV64XXX_I2C_ACTION_CONTINUE:
251 writel(drv_data->cntl_bits,
252 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
253 break;
254
255 case MV64XXX_I2C_ACTION_SEND_START:
256 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_START,
257 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
258 break;
259
260 case MV64XXX_I2C_ACTION_SEND_ADDR_1:
261 writel(drv_data->addr1,
262 drv_data->reg_base + MV64XXX_I2C_REG_DATA);
263 writel(drv_data->cntl_bits,
264 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
265 break;
266
267 case MV64XXX_I2C_ACTION_SEND_ADDR_2:
268 writel(drv_data->addr2,
269 drv_data->reg_base + MV64XXX_I2C_REG_DATA);
270 writel(drv_data->cntl_bits,
271 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
272 break;
273
274 case MV64XXX_I2C_ACTION_SEND_DATA:
275 writel(drv_data->msg->buf[drv_data->byte_posn++],
276 drv_data->reg_base + MV64XXX_I2C_REG_DATA);
277 writel(drv_data->cntl_bits,
278 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
279 break;
280
281 case MV64XXX_I2C_ACTION_RCV_DATA:
282 drv_data->msg->buf[drv_data->byte_posn++] =
283 readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
284 writel(drv_data->cntl_bits,
285 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
286 break;
287
288 case MV64XXX_I2C_ACTION_RCV_DATA_STOP:
289 drv_data->msg->buf[drv_data->byte_posn++] =
290 readl(drv_data->reg_base + MV64XXX_I2C_REG_DATA);
291 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
292 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
293 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
294 drv_data->block = 0;
295 wake_up_interruptible(&drv_data->waitq);
296 break;
297
298 case MV64XXX_I2C_ACTION_INVALID:
299 default:
300 dev_err(&drv_data->adapter.dev,
301 "mv64xxx_i2c_do_action: Invalid action: %d\n",
302 drv_data->action);
303 drv_data->rc = -EIO;
304 /* FALLTHRU */
305 case MV64XXX_I2C_ACTION_SEND_STOP:
306 drv_data->cntl_bits &= ~MV64XXX_I2C_REG_CONTROL_INTEN;
307 writel(drv_data->cntl_bits | MV64XXX_I2C_REG_CONTROL_STOP,
308 drv_data->reg_base + MV64XXX_I2C_REG_CONTROL);
309 drv_data->block = 0;
310 wake_up_interruptible(&drv_data->waitq);
311 break;
312 }
313 }
314
315 static irqreturn_t
316 mv64xxx_i2c_intr(int irq, void *dev_id)
317 {
318 struct mv64xxx_i2c_data *drv_data = dev_id;
319 unsigned long flags;
320 u32 status;
321 irqreturn_t rc = IRQ_NONE;
322
323 spin_lock_irqsave(&drv_data->lock, flags);
324 while (readl(drv_data->reg_base + MV64XXX_I2C_REG_CONTROL) &
325 MV64XXX_I2C_REG_CONTROL_IFLG) {
326 status = readl(drv_data->reg_base + MV64XXX_I2C_REG_STATUS);
327 mv64xxx_i2c_fsm(drv_data, status);
328 mv64xxx_i2c_do_action(drv_data);
329 rc = IRQ_HANDLED;
330 }
331 spin_unlock_irqrestore(&drv_data->lock, flags);
332
333 return rc;
334 }
335
336 /*
337 *****************************************************************************
338 *
339 * I2C Msg Execution Routines
340 *
341 *****************************************************************************
342 */
343 static void
344 mv64xxx_i2c_prepare_for_io(struct mv64xxx_i2c_data *drv_data,
345 struct i2c_msg *msg)
346 {
347 u32 dir = 0;
348
349 drv_data->msg = msg;
350 drv_data->byte_posn = 0;
351 drv_data->bytes_left = msg->len;
352 drv_data->aborting = 0;
353 drv_data->rc = 0;
354 drv_data->cntl_bits = MV64XXX_I2C_REG_CONTROL_ACK |
355 MV64XXX_I2C_REG_CONTROL_INTEN | MV64XXX_I2C_REG_CONTROL_TWSIEN;
356
357 if (msg->flags & I2C_M_RD)
358 dir = 1;
359
360 if (msg->flags & I2C_M_TEN) {
361 drv_data->addr1 = 0xf0 | (((u32)msg->addr & 0x300) >> 7) | dir;
362 drv_data->addr2 = (u32)msg->addr & 0xff;
363 } else {
364 drv_data->addr1 = ((u32)msg->addr & 0x7f) << 1 | dir;
365 drv_data->addr2 = 0;
366 }
367 }
368
369 static void
370 mv64xxx_i2c_wait_for_completion(struct mv64xxx_i2c_data *drv_data)
371 {
372 long time_left;
373 unsigned long flags;
374 char abort = 0;
375
376 time_left = wait_event_interruptible_timeout(drv_data->waitq,
377 !drv_data->block, drv_data->adapter.timeout);
378
379 spin_lock_irqsave(&drv_data->lock, flags);
380 if (!time_left) { /* Timed out */
381 drv_data->rc = -ETIMEDOUT;
382 abort = 1;
383 } else if (time_left < 0) { /* Interrupted/Error */
384 drv_data->rc = time_left; /* errno value */
385 abort = 1;
386 }
387
388 if (abort && drv_data->block) {
389 drv_data->aborting = 1;
390 spin_unlock_irqrestore(&drv_data->lock, flags);
391
392 time_left = wait_event_timeout(drv_data->waitq,
393 !drv_data->block, drv_data->adapter.timeout);
394
395 if ((time_left <= 0) && drv_data->block) {
396 drv_data->state = MV64XXX_I2C_STATE_IDLE;
397 dev_err(&drv_data->adapter.dev,
398 "mv64xxx: I2C bus locked, block: %d, "
399 "time_left: %d\n", drv_data->block,
400 (int)time_left);
401 mv64xxx_i2c_hw_init(drv_data);
402 }
403 } else
404 spin_unlock_irqrestore(&drv_data->lock, flags);
405 }
406
407 static int
408 mv64xxx_i2c_execute_msg(struct mv64xxx_i2c_data *drv_data, struct i2c_msg *msg,
409 int is_first, int is_last)
410 {
411 unsigned long flags;
412
413 spin_lock_irqsave(&drv_data->lock, flags);
414 mv64xxx_i2c_prepare_for_io(drv_data, msg);
415
416 if (unlikely(msg->flags & I2C_M_NOSTART)) { /* Skip start/addr phases */
417 if (drv_data->msg->flags & I2C_M_RD) {
418 /* No action to do, wait for slave to send a byte */
419 drv_data->action = MV64XXX_I2C_ACTION_CONTINUE;
420 drv_data->state =
421 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_DATA;
422 } else {
423 drv_data->action = MV64XXX_I2C_ACTION_SEND_DATA;
424 drv_data->state =
425 MV64XXX_I2C_STATE_WAITING_FOR_SLAVE_ACK;
426 drv_data->bytes_left--;
427 }
428 } else {
429 if (is_first) {
430 drv_data->action = MV64XXX_I2C_ACTION_SEND_START;
431 drv_data->state =
432 MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
433 } else {
434 drv_data->action = MV64XXX_I2C_ACTION_SEND_ADDR_1;
435 drv_data->state =
436 MV64XXX_I2C_STATE_WAITING_FOR_ADDR_1_ACK;
437 }
438 }
439
440 drv_data->send_stop = is_last;
441 drv_data->block = 1;
442 mv64xxx_i2c_do_action(drv_data);
443 spin_unlock_irqrestore(&drv_data->lock, flags);
444
445 mv64xxx_i2c_wait_for_completion(drv_data);
446 return drv_data->rc;
447 }
448
449 /*
450 *****************************************************************************
451 *
452 * I2C Core Support Routines (Interface to higher level I2C code)
453 *
454 *****************************************************************************
455 */
456 static u32
457 mv64xxx_i2c_functionality(struct i2c_adapter *adap)
458 {
459 return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
460 }
461
462 static int
463 mv64xxx_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
464 {
465 struct mv64xxx_i2c_data *drv_data = i2c_get_adapdata(adap);
466 int i, rc;
467
468 for (i = 0; i < num; i++) {
469 rc = mv64xxx_i2c_execute_msg(drv_data, &msgs[i],
470 i == 0, i + 1 == num);
471 if (rc < 0)
472 return rc;
473 }
474
475 return num;
476 }
477
478 static const struct i2c_algorithm mv64xxx_i2c_algo = {
479 .master_xfer = mv64xxx_i2c_xfer,
480 .functionality = mv64xxx_i2c_functionality,
481 };
482
483 /*
484 *****************************************************************************
485 *
486 * Driver Interface & Early Init Routines
487 *
488 *****************************************************************************
489 */
490 static int __devinit
491 mv64xxx_i2c_map_regs(struct platform_device *pd,
492 struct mv64xxx_i2c_data *drv_data)
493 {
494 int size;
495 struct resource *r = platform_get_resource(pd, IORESOURCE_MEM, 0);
496
497 if (!r)
498 return -ENODEV;
499
500 size = resource_size(r);
501
502 if (!request_mem_region(r->start, size, drv_data->adapter.name))
503 return -EBUSY;
504
505 drv_data->reg_base = ioremap(r->start, size);
506 drv_data->reg_base_p = r->start;
507 drv_data->reg_size = size;
508
509 return 0;
510 }
511
512 static void
513 mv64xxx_i2c_unmap_regs(struct mv64xxx_i2c_data *drv_data)
514 {
515 if (drv_data->reg_base) {
516 iounmap(drv_data->reg_base);
517 release_mem_region(drv_data->reg_base_p, drv_data->reg_size);
518 }
519
520 drv_data->reg_base = NULL;
521 drv_data->reg_base_p = 0;
522 }
523
524 static int __devinit
525 mv64xxx_i2c_probe(struct platform_device *pd)
526 {
527 struct mv64xxx_i2c_data *drv_data;
528 struct mv64xxx_i2c_pdata *pdata = pd->dev.platform_data;
529 int rc;
530
531 if ((pd->id != 0) || !pdata)
532 return -ENODEV;
533
534 drv_data = kzalloc(sizeof(struct mv64xxx_i2c_data), GFP_KERNEL);
535 if (!drv_data)
536 return -ENOMEM;
537
538 if (mv64xxx_i2c_map_regs(pd, drv_data)) {
539 rc = -ENODEV;
540 goto exit_kfree;
541 }
542
543 strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
544 sizeof(drv_data->adapter.name));
545
546 init_waitqueue_head(&drv_data->waitq);
547 spin_lock_init(&drv_data->lock);
548
549 drv_data->freq_m = pdata->freq_m;
550 drv_data->freq_n = pdata->freq_n;
551 drv_data->irq = platform_get_irq(pd, 0);
552 if (drv_data->irq < 0) {
553 rc = -ENXIO;
554 goto exit_unmap_regs;
555 }
556 drv_data->adapter.dev.parent = &pd->dev;
557 drv_data->adapter.algo = &mv64xxx_i2c_algo;
558 drv_data->adapter.owner = THIS_MODULE;
559 drv_data->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
560 drv_data->adapter.timeout = msecs_to_jiffies(pdata->timeout);
561 drv_data->adapter.nr = pd->id;
562 platform_set_drvdata(pd, drv_data);
563 i2c_set_adapdata(&drv_data->adapter, drv_data);
564
565 mv64xxx_i2c_hw_init(drv_data);
566
567 if (request_irq(drv_data->irq, mv64xxx_i2c_intr, 0,
568 MV64XXX_I2C_CTLR_NAME, drv_data)) {
569 dev_err(&drv_data->adapter.dev,
570 "mv64xxx: Can't register intr handler irq: %d\n",
571 drv_data->irq);
572 rc = -EINVAL;
573 goto exit_unmap_regs;
574 } else if ((rc = i2c_add_numbered_adapter(&drv_data->adapter)) != 0) {
575 dev_err(&drv_data->adapter.dev,
576 "mv64xxx: Can't add i2c adapter, rc: %d\n", -rc);
577 goto exit_free_irq;
578 }
579
580 return 0;
581
582 exit_free_irq:
583 free_irq(drv_data->irq, drv_data);
584 exit_unmap_regs:
585 mv64xxx_i2c_unmap_regs(drv_data);
586 exit_kfree:
587 kfree(drv_data);
588 return rc;
589 }
590
591 static int __devexit
592 mv64xxx_i2c_remove(struct platform_device *dev)
593 {
594 struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev);
595 int rc;
596
597 rc = i2c_del_adapter(&drv_data->adapter);
598 free_irq(drv_data->irq, drv_data);
599 mv64xxx_i2c_unmap_regs(drv_data);
600 kfree(drv_data);
601
602 return rc;
603 }
604
605 static struct platform_driver mv64xxx_i2c_driver = {
606 .probe = mv64xxx_i2c_probe,
607 .remove = __devexit_p(mv64xxx_i2c_remove),
608 .driver = {
609 .owner = THIS_MODULE,
610 .name = MV64XXX_I2C_CTLR_NAME,
611 },
612 };
613
614 static int __init
615 mv64xxx_i2c_init(void)
616 {
617 return platform_driver_register(&mv64xxx_i2c_driver);
618 }
619
620 static void __exit
621 mv64xxx_i2c_exit(void)
622 {
623 platform_driver_unregister(&mv64xxx_i2c_driver);
624 }
625
626 module_init(mv64xxx_i2c_init);
627 module_exit(mv64xxx_i2c_exit);
628
629 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
630 MODULE_DESCRIPTION("Marvell mv64xxx host bridge i2c ctlr driver");
631 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree