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i2c/imx: don't add probe function to the driver struct
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / i2c / busses / i2c-imx.c
blob32375bddae7df6aa4fca67d17a045c00b3c9f9de
1 /*
2 * Copyright (C) 2002 Motorola GSG-China
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 *
19 * Author:
20 * Darius Augulis, Teltonika Inc.
21 *
22 * Desc.:
23 * Implementation of I2C Adapter/Algorithm Driver
24 * for I2C Bus integrated in Freescale i.MX/MXC processors
25 *
26 * Derived from Motorola GSG China I2C example driver
27 *
28 * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de
29 * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de
30 * Copyright (C) 2007 RightHand Technologies, Inc.
31 * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
32 *
33 */
34
35 /** Includes *******************************************************************
36 *******************************************************************************/
37
38 #include <linux/init.h>
39 #include <linux/kernel.h>
40 #include <linux/module.h>
41 #include <linux/errno.h>
42 #include <linux/err.h>
43 #include <linux/interrupt.h>
44 #include <linux/delay.h>
45 #include <linux/i2c.h>
46 #include <linux/io.h>
47 #include <linux/sched.h>
48 #include <linux/platform_device.h>
49 #include <linux/clk.h>
50
51 #include <mach/irqs.h>
52 #include <mach/hardware.h>
53 #include <mach/i2c.h>
54
55 /** Defines ********************************************************************
56 *******************************************************************************/
57
58 /* This will be the driver name the kernel reports */
59 #define DRIVER_NAME "imx-i2c"
60
61 /* Default value */
62 #define IMX_I2C_BIT_RATE 100000 /* 100kHz */
63
64 /* IMX I2C registers */
65 #define IMX_I2C_IADR 0x00 /* i2c slave address */
66 #define IMX_I2C_IFDR 0x04 /* i2c frequency divider */
67 #define IMX_I2C_I2CR 0x08 /* i2c control */
68 #define IMX_I2C_I2SR 0x0C /* i2c status */
69 #define IMX_I2C_I2DR 0x10 /* i2c transfer data */
70
71 /* Bits of IMX I2C registers */
72 #define I2SR_RXAK 0x01
73 #define I2SR_IIF 0x02
74 #define I2SR_SRW 0x04
75 #define I2SR_IAL 0x10
76 #define I2SR_IBB 0x20
77 #define I2SR_IAAS 0x40
78 #define I2SR_ICF 0x80
79 #define I2CR_RSTA 0x04
80 #define I2CR_TXAK 0x08
81 #define I2CR_MTX 0x10
82 #define I2CR_MSTA 0x20
83 #define I2CR_IIEN 0x40
84 #define I2CR_IEN 0x80
85
86 /** Variables ******************************************************************
87 *******************************************************************************/
88
89 /*
90 * sorted list of clock divider, register value pairs
91 * taken from table 26-5, p.26-9, Freescale i.MX
92 * Integrated Portable System Processor Reference Manual
93 * Document Number: MC9328MXLRM, Rev. 5.1, 06/2007
94 *
95 * Duplicated divider values removed from list
96 */
97
98 static u16 __initdata i2c_clk_div[50][2] = {
99 { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
100 { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
101 { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
102 { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
103 { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
104 { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
105 { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
106 { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
107 { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
108 { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
109 { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
110 { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
111 { 3072, 0x1E }, { 3840, 0x1F }
112 };
113
114 struct imx_i2c_struct {
115 struct i2c_adapter adapter;
116 struct resource *res;
117 struct clk *clk;
118 void __iomem *base;
119 int irq;
120 wait_queue_head_t queue;
121 unsigned long i2csr;
122 unsigned int disable_delay;
123 int stopped;
124 unsigned int ifdr; /* IMX_I2C_IFDR */
125 };
126
127 /** Functions for IMX I2C adapter driver ***************************************
128 *******************************************************************************/
129
130 static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy)
131 {
132 unsigned long orig_jiffies = jiffies;
133 unsigned int temp;
134
135 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
136
137 while (1) {
138 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
139 if (for_busy && (temp & I2SR_IBB))
140 break;
141 if (!for_busy && !(temp & I2SR_IBB))
142 break;
143 if (signal_pending(current)) {
144 dev_dbg(&i2c_imx->adapter.dev,
145 "<%s> I2C Interrupted\n", __func__);
146 return -EINTR;
147 }
148 if (time_after(jiffies, orig_jiffies + HZ / 1000)) {
149 dev_dbg(&i2c_imx->adapter.dev,
150 "<%s> I2C bus is busy\n", __func__);
151 return -EIO;
152 }
153 schedule();
154 }
155
156 return 0;
157 }
158
159 static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx)
160 {
161 int result;
162
163 result = wait_event_interruptible_timeout(i2c_imx->queue,
164 i2c_imx->i2csr & I2SR_IIF, HZ / 10);
165
166 if (unlikely(result < 0)) {
167 dev_dbg(&i2c_imx->adapter.dev, "<%s> result < 0\n", __func__);
168 return result;
169 } else if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) {
170 dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__);
171 return -ETIMEDOUT;
172 }
173 dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__);
174 i2c_imx->i2csr = 0;
175 return 0;
176 }
177
178 static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx)
179 {
180 if (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_RXAK) {
181 dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
182 return -EIO; /* No ACK */
183 }
184
185 dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__);
186 return 0;
187 }
188
189 static int i2c_imx_start(struct imx_i2c_struct *i2c_imx)
190 {
191 unsigned int temp = 0;
192 int result;
193
194 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
195
196 clk_enable(i2c_imx->clk);
197 writeb(i2c_imx->ifdr, i2c_imx->base + IMX_I2C_IFDR);
198 /* Enable I2C controller */
199 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
200 writeb(I2CR_IEN, i2c_imx->base + IMX_I2C_I2CR);
201
202 /* Wait controller to be stable */
203 udelay(50);
204
205 /* Start I2C transaction */
206 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
207 temp |= I2CR_MSTA;
208 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
209 result = i2c_imx_bus_busy(i2c_imx, 1);
210 if (result)
211 return result;
212 i2c_imx->stopped = 0;
213
214 temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK;
215 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
216 return result;
217 }
218
219 static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
220 {
221 unsigned int temp = 0;
222
223 if (!i2c_imx->stopped) {
224 /* Stop I2C transaction */
225 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
226 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
227 temp &= ~(I2CR_MSTA | I2CR_MTX);
228 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
229 }
230 if (cpu_is_mx1()) {
231 /*
232 * This delay caused by an i.MXL hardware bug.
233 * If no (or too short) delay, no "STOP" bit will be generated.
234 */
235 udelay(i2c_imx->disable_delay);
236 }
237
238 if (!i2c_imx->stopped) {
239 i2c_imx_bus_busy(i2c_imx, 0);
240 i2c_imx->stopped = 1;
241 }
242
243 /* Disable I2C controller */
244 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
245 clk_disable(i2c_imx->clk);
246 }
247
248 static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx,
249 unsigned int rate)
250 {
251 unsigned int i2c_clk_rate;
252 unsigned int div;
253 int i;
254
255 /* Divider value calculation */
256 i2c_clk_rate = clk_get_rate(i2c_imx->clk);
257 div = (i2c_clk_rate + rate - 1) / rate;
258 if (div < i2c_clk_div[0][0])
259 i = 0;
260 else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
261 i = ARRAY_SIZE(i2c_clk_div) - 1;
262 else
263 for (i = 0; i2c_clk_div[i][0] < div; i++);
264
265 /* Store divider value */
266 i2c_imx->ifdr = i2c_clk_div[i][1];
267
268 /*
269 * There dummy delay is calculated.
270 * It should be about one I2C clock period long.
271 * This delay is used in I2C bus disable function
272 * to fix chip hardware bug.
273 */
274 i2c_imx->disable_delay = (500000U * i2c_clk_div[i][0]
275 + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2);
276
277 /* dev_dbg() can't be used, because adapter is not yet registered */
278 #ifdef CONFIG_I2C_DEBUG_BUS
279 printk(KERN_DEBUG "I2C: <%s> I2C_CLK=%d, REQ DIV=%d\n",
280 __func__, i2c_clk_rate, div);
281 printk(KERN_DEBUG "I2C: <%s> IFDR[IC]=0x%x, REAL DIV=%d\n",
282 __func__, i2c_clk_div[i][1], i2c_clk_div[i][0]);
283 #endif
284 }
285
286 static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
287 {
288 struct imx_i2c_struct *i2c_imx = dev_id;
289 unsigned int temp;
290
291 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
292 if (temp & I2SR_IIF) {
293 /* save status register */
294 i2c_imx->i2csr = temp;
295 temp &= ~I2SR_IIF;
296 writeb(temp, i2c_imx->base + IMX_I2C_I2SR);
297 wake_up_interruptible(&i2c_imx->queue);
298 return IRQ_HANDLED;
299 }
300
301 return IRQ_NONE;
302 }
303
304 static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
305 {
306 int i, result;
307
308 dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n",
309 __func__, msgs->addr << 1);
310
311 /* write slave address */
312 writeb(msgs->addr << 1, i2c_imx->base + IMX_I2C_I2DR);
313 result = i2c_imx_trx_complete(i2c_imx);
314 if (result)
315 return result;
316 result = i2c_imx_acked(i2c_imx);
317 if (result)
318 return result;
319 dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__);
320
321 /* write data */
322 for (i = 0; i < msgs->len; i++) {
323 dev_dbg(&i2c_imx->adapter.dev,
324 "<%s> write byte: B%d=0x%X\n",
325 __func__, i, msgs->buf[i]);
326 writeb(msgs->buf[i], i2c_imx->base + IMX_I2C_I2DR);
327 result = i2c_imx_trx_complete(i2c_imx);
328 if (result)
329 return result;
330 result = i2c_imx_acked(i2c_imx);
331 if (result)
332 return result;
333 }
334 return 0;
335 }
336
337 static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
338 {
339 int i, result;
340 unsigned int temp;
341
342 dev_dbg(&i2c_imx->adapter.dev,
343 "<%s> write slave address: addr=0x%x\n",
344 __func__, (msgs->addr << 1) | 0x01);
345
346 /* write slave address */
347 writeb((msgs->addr << 1) | 0x01, i2c_imx->base + IMX_I2C_I2DR);
348 result = i2c_imx_trx_complete(i2c_imx);
349 if (result)
350 return result;
351 result = i2c_imx_acked(i2c_imx);
352 if (result)
353 return result;
354
355 dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__);
356
357 /* setup bus to read data */
358 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
359 temp &= ~I2CR_MTX;
360 if (msgs->len - 1)
361 temp &= ~I2CR_TXAK;
362 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
363 readb(i2c_imx->base + IMX_I2C_I2DR); /* dummy read */
364
365 dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__);
366
367 /* read data */
368 for (i = 0; i < msgs->len; i++) {
369 result = i2c_imx_trx_complete(i2c_imx);
370 if (result)
371 return result;
372 if (i == (msgs->len - 1)) {
373 /* It must generate STOP before read I2DR to prevent
374 controller from generating another clock cycle */
375 dev_dbg(&i2c_imx->adapter.dev,
376 "<%s> clear MSTA\n", __func__);
377 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
378 temp &= ~(I2CR_MSTA | I2CR_MTX);
379 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
380 i2c_imx_bus_busy(i2c_imx, 0);
381 i2c_imx->stopped = 1;
382 } else if (i == (msgs->len - 2)) {
383 dev_dbg(&i2c_imx->adapter.dev,
384 "<%s> set TXAK\n", __func__);
385 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
386 temp |= I2CR_TXAK;
387 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
388 }
389 msgs->buf[i] = readb(i2c_imx->base + IMX_I2C_I2DR);
390 dev_dbg(&i2c_imx->adapter.dev,
391 "<%s> read byte: B%d=0x%X\n",
392 __func__, i, msgs->buf[i]);
393 }
394 return 0;
395 }
396
397 static int i2c_imx_xfer(struct i2c_adapter *adapter,
398 struct i2c_msg *msgs, int num)
399 {
400 unsigned int i, temp;
401 int result;
402 struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
403
404 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
405
406 /* Start I2C transfer */
407 result = i2c_imx_start(i2c_imx);
408 if (result)
409 goto fail0;
410
411 /* read/write data */
412 for (i = 0; i < num; i++) {
413 if (i) {
414 dev_dbg(&i2c_imx->adapter.dev,
415 "<%s> repeated start\n", __func__);
416 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
417 temp |= I2CR_RSTA;
418 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
419 result = i2c_imx_bus_busy(i2c_imx, 1);
420 if (result)
421 goto fail0;
422 }
423 dev_dbg(&i2c_imx->adapter.dev,
424 "<%s> transfer message: %d\n", __func__, i);
425 /* write/read data */
426 #ifdef CONFIG_I2C_DEBUG_BUS
427 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
428 dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, "
429 "MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__,
430 (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0),
431 (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0),
432 (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0));
433 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
434 dev_dbg(&i2c_imx->adapter.dev,
435 "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, "
436 "IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__,
437 (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0),
438 (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0),
439 (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0),
440 (temp & I2SR_RXAK ? 1 : 0));
441 #endif
442 if (msgs[i].flags & I2C_M_RD)
443 result = i2c_imx_read(i2c_imx, &msgs[i]);
444 else
445 result = i2c_imx_write(i2c_imx, &msgs[i]);
446 }
447
448 fail0:
449 /* Stop I2C transfer */
450 i2c_imx_stop(i2c_imx);
451
452 dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
453 (result < 0) ? "error" : "success msg",
454 (result < 0) ? result : num);
455 return (result < 0) ? result : num;
456 }
457
458 static u32 i2c_imx_func(struct i2c_adapter *adapter)
459 {
460 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
461 }
462
463 static struct i2c_algorithm i2c_imx_algo = {
464 .master_xfer = i2c_imx_xfer,
465 .functionality = i2c_imx_func,
466 };
467
468 static int __init i2c_imx_probe(struct platform_device *pdev)
469 {
470 struct imx_i2c_struct *i2c_imx;
471 struct resource *res;
472 struct imxi2c_platform_data *pdata;
473 void __iomem *base;
474 resource_size_t res_size;
475 int irq;
476 int ret;
477
478 dev_dbg(&pdev->dev, "<%s>\n", __func__);
479
480 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
481 if (!res) {
482 dev_err(&pdev->dev, "can't get device resources\n");
483 return -ENOENT;
484 }
485 irq = platform_get_irq(pdev, 0);
486 if (irq < 0) {
487 dev_err(&pdev->dev, "can't get irq number\n");
488 return -ENOENT;
489 }
490
491 pdata = pdev->dev.platform_data;
492
493 if (pdata && pdata->init) {
494 ret = pdata->init(&pdev->dev);
495 if (ret)
496 return ret;
497 }
498
499 res_size = resource_size(res);
500
501 if (!request_mem_region(res->start, res_size, DRIVER_NAME)) {
502 ret = -EBUSY;
503 goto fail0;
504 }
505
506 base = ioremap(res->start, res_size);
507 if (!base) {
508 dev_err(&pdev->dev, "ioremap failed\n");
509 ret = -EIO;
510 goto fail1;
511 }
512
513 i2c_imx = kzalloc(sizeof(struct imx_i2c_struct), GFP_KERNEL);
514 if (!i2c_imx) {
515 dev_err(&pdev->dev, "can't allocate interface\n");
516 ret = -ENOMEM;
517 goto fail2;
518 }
519
520 /* Setup i2c_imx driver structure */
521 strcpy(i2c_imx->adapter.name, pdev->name);
522 i2c_imx->adapter.owner = THIS_MODULE;
523 i2c_imx->adapter.algo = &i2c_imx_algo;
524 i2c_imx->adapter.dev.parent = &pdev->dev;
525 i2c_imx->adapter.nr = pdev->id;
526 i2c_imx->irq = irq;
527 i2c_imx->base = base;
528 i2c_imx->res = res;
529
530 /* Get I2C clock */
531 i2c_imx->clk = clk_get(&pdev->dev, "i2c_clk");
532 if (IS_ERR(i2c_imx->clk)) {
533 ret = PTR_ERR(i2c_imx->clk);
534 dev_err(&pdev->dev, "can't get I2C clock\n");
535 goto fail3;
536 }
537
538 /* Request IRQ */
539 ret = request_irq(i2c_imx->irq, i2c_imx_isr, 0, pdev->name, i2c_imx);
540 if (ret) {
541 dev_err(&pdev->dev, "can't claim irq %d\n", i2c_imx->irq);
542 goto fail4;
543 }
544
545 /* Init queue */
546 init_waitqueue_head(&i2c_imx->queue);
547
548 /* Set up adapter data */
549 i2c_set_adapdata(&i2c_imx->adapter, i2c_imx);
550
551 /* Set up clock divider */
552 if (pdata && pdata->bitrate)
553 i2c_imx_set_clk(i2c_imx, pdata->bitrate);
554 else
555 i2c_imx_set_clk(i2c_imx, IMX_I2C_BIT_RATE);
556
557 /* Set up chip registers to defaults */
558 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
559 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
560
561 /* Add I2C adapter */
562 ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
563 if (ret < 0) {
564 dev_err(&pdev->dev, "registration failed\n");
565 goto fail5;
566 }
567
568 /* Set up platform driver data */
569 platform_set_drvdata(pdev, i2c_imx);
570
571 dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", i2c_imx->irq);
572 dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",
573 i2c_imx->res->start, i2c_imx->res->end);
574 dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x \n",
575 res_size, i2c_imx->res->start);
576 dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
577 i2c_imx->adapter.name);
578 dev_dbg(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
579
580 return 0; /* Return OK */
581
582 fail5:
583 free_irq(i2c_imx->irq, i2c_imx);
584 fail4:
585 clk_put(i2c_imx->clk);
586 fail3:
587 kfree(i2c_imx);
588 fail2:
589 iounmap(base);
590 fail1:
591 release_mem_region(res->start, resource_size(res));
592 fail0:
593 if (pdata && pdata->exit)
594 pdata->exit(&pdev->dev);
595 return ret; /* Return error number */
596 }
597
598 static int __exit i2c_imx_remove(struct platform_device *pdev)
599 {
600 struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
601 struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
602
603 /* remove adapter */
604 dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
605 i2c_del_adapter(&i2c_imx->adapter);
606 platform_set_drvdata(pdev, NULL);
607
608 /* free interrupt */
609 free_irq(i2c_imx->irq, i2c_imx);
610
611 /* setup chip registers to defaults */
612 writeb(0, i2c_imx->base + IMX_I2C_IADR);
613 writeb(0, i2c_imx->base + IMX_I2C_IFDR);
614 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
615 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
616
617 /* Shut down hardware */
618 if (pdata && pdata->exit)
619 pdata->exit(&pdev->dev);
620
621 clk_put(i2c_imx->clk);
622
623 iounmap(i2c_imx->base);
624 release_mem_region(i2c_imx->res->start, resource_size(i2c_imx->res));
625 kfree(i2c_imx);
626 return 0;
627 }
628
629 static struct platform_driver i2c_imx_driver = {
630 .remove = __exit_p(i2c_imx_remove),
631 .driver = {
632 .name = DRIVER_NAME,
633 .owner = THIS_MODULE,
634 }
635 };
636
637 static int __init i2c_adap_imx_init(void)
638 {
639 return platform_driver_probe(&i2c_imx_driver, i2c_imx_probe);
640 }
641 subsys_initcall(i2c_adap_imx_init);
642
643 static void __exit i2c_adap_imx_exit(void)
644 {
645 platform_driver_unregister(&i2c_imx_driver);
646 }
647 module_exit(i2c_adap_imx_exit);
648
649 MODULE_LICENSE("GPL");
650 MODULE_AUTHOR("Darius Augulis");
651 MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus");
652 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree