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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / i2c / busses / i2c-omap.c
blobe471e3bfdc1e08872dcc9d4dd23e1e81a5d422cd
1 /*
2 * TI OMAP I2C master mode driver
3 *
4 * Copyright (C) 2003 MontaVista Software, Inc.
5 * Copyright (C) 2004 Texas Instruments.
6 *
7 * Updated to work with multiple I2C interfaces on 24xx by
8 * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
9 * Copyright (C) 2005 Nokia Corporation
10 *
11 * Cleaned up by Juha Yrjölä <juha.yrjola@nokia.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include <linux/module.h>
29 #include <linux/delay.h>
30 #include <linux/i2c.h>
31 #include <linux/err.h>
32 #include <linux/interrupt.h>
33 #include <linux/completion.h>
34 #include <linux/platform_device.h>
35 #include <linux/clk.h>
36
37 #include <asm/io.h>
38
39 /* timeout waiting for the controller to respond */
40 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
41
42 #define OMAP_I2C_REV_REG 0x00
43 #define OMAP_I2C_IE_REG 0x04
44 #define OMAP_I2C_STAT_REG 0x08
45 #define OMAP_I2C_IV_REG 0x0c
46 #define OMAP_I2C_SYSS_REG 0x10
47 #define OMAP_I2C_BUF_REG 0x14
48 #define OMAP_I2C_CNT_REG 0x18
49 #define OMAP_I2C_DATA_REG 0x1c
50 #define OMAP_I2C_SYSC_REG 0x20
51 #define OMAP_I2C_CON_REG 0x24
52 #define OMAP_I2C_OA_REG 0x28
53 #define OMAP_I2C_SA_REG 0x2c
54 #define OMAP_I2C_PSC_REG 0x30
55 #define OMAP_I2C_SCLL_REG 0x34
56 #define OMAP_I2C_SCLH_REG 0x38
57 #define OMAP_I2C_SYSTEST_REG 0x3c
58
59 /* I2C Interrupt Enable Register (OMAP_I2C_IE): */
60 #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */
61 #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */
62 #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */
63 #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */
64 #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */
65
66 /* I2C Status Register (OMAP_I2C_STAT): */
67 #define OMAP_I2C_STAT_SBD (1 << 15) /* Single byte data */
68 #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */
69 #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */
70 #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */
71 #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */
72 #define OMAP_I2C_STAT_AD0 (1 << 8) /* Address zero */
73 #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */
74 #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */
75 #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */
76 #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */
77 #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */
78
79 /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */
80 #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */
81 #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */
82
83 /* I2C Configuration Register (OMAP_I2C_CON): */
84 #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */
85 #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */
86 #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */
87 #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */
88 #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */
89 #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */
90 #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */
91 #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */
92 #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */
93
94 /* I2C System Test Register (OMAP_I2C_SYSTEST): */
95 #ifdef DEBUG
96 #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */
97 #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */
98 #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */
99 #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */
100 #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */
101 #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */
102 #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */
103 #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */
104 #endif
105
106 /* I2C System Status register (OMAP_I2C_SYSS): */
107 #define OMAP_I2C_SYSS_RDONE (1 << 0) /* Reset Done */
108
109 /* I2C System Configuration Register (OMAP_I2C_SYSC): */
110 #define OMAP_I2C_SYSC_SRST (1 << 1) /* Soft Reset */
111
112 /* REVISIT: Use platform_data instead of module parameters */
113 /* Fast Mode = 400 kHz, Standard = 100 kHz */
114 static int clock = 100; /* Default: 100 kHz */
115 module_param(clock, int, 0);
116 MODULE_PARM_DESC(clock, "Set I2C clock in kHz: 400=fast mode (default == 100)");
117
118 struct omap_i2c_dev {
119 struct device *dev;
120 void __iomem *base; /* virtual */
121 int irq;
122 struct clk *iclk; /* Interface clock */
123 struct clk *fclk; /* Functional clock */
124 struct completion cmd_complete;
125 struct resource *ioarea;
126 u16 cmd_err;
127 u8 *buf;
128 size_t buf_len;
129 struct i2c_adapter adapter;
130 unsigned rev1:1;
131 };
132
133 static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev,
134 int reg, u16 val)
135 {
136 __raw_writew(val, i2c_dev->base + reg);
137 }
138
139 static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg)
140 {
141 return __raw_readw(i2c_dev->base + reg);
142 }
143
144 static int omap_i2c_get_clocks(struct omap_i2c_dev *dev)
145 {
146 if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
147 dev->iclk = clk_get(dev->dev, "i2c_ick");
148 if (IS_ERR(dev->iclk)) {
149 dev->iclk = NULL;
150 return -ENODEV;
151 }
152 }
153
154 dev->fclk = clk_get(dev->dev, "i2c_fck");
155 if (IS_ERR(dev->fclk)) {
156 if (dev->iclk != NULL) {
157 clk_put(dev->iclk);
158 dev->iclk = NULL;
159 }
160 dev->fclk = NULL;
161 return -ENODEV;
162 }
163
164 return 0;
165 }
166
167 static void omap_i2c_put_clocks(struct omap_i2c_dev *dev)
168 {
169 clk_put(dev->fclk);
170 dev->fclk = NULL;
171 if (dev->iclk != NULL) {
172 clk_put(dev->iclk);
173 dev->iclk = NULL;
174 }
175 }
176
177 static void omap_i2c_enable_clocks(struct omap_i2c_dev *dev)
178 {
179 if (dev->iclk != NULL)
180 clk_enable(dev->iclk);
181 clk_enable(dev->fclk);
182 }
183
184 static void omap_i2c_disable_clocks(struct omap_i2c_dev *dev)
185 {
186 if (dev->iclk != NULL)
187 clk_disable(dev->iclk);
188 clk_disable(dev->fclk);
189 }
190
191 static int omap_i2c_init(struct omap_i2c_dev *dev)
192 {
193 u16 psc = 0;
194 unsigned long fclk_rate = 12000000;
195 unsigned long timeout;
196
197 if (!dev->rev1) {
198 omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, OMAP_I2C_SYSC_SRST);
199 /* For some reason we need to set the EN bit before the
200 * reset done bit gets set. */
201 timeout = jiffies + OMAP_I2C_TIMEOUT;
202 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
203 while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) &
204 OMAP_I2C_SYSS_RDONE)) {
205 if (time_after(jiffies, timeout)) {
206 dev_warn(dev->dev, "timeout waiting"
207 "for controller reset\n");
208 return -ETIMEDOUT;
209 }
210 msleep(1);
211 }
212 }
213 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
214
215 if (cpu_class_is_omap1()) {
216 struct clk *armxor_ck;
217
218 armxor_ck = clk_get(NULL, "armxor_ck");
219 if (IS_ERR(armxor_ck))
220 dev_warn(dev->dev, "Could not get armxor_ck\n");
221 else {
222 fclk_rate = clk_get_rate(armxor_ck);
223 clk_put(armxor_ck);
224 }
225 /* TRM for 5912 says the I2C clock must be prescaled to be
226 * between 7 - 12 MHz. The XOR input clock is typically
227 * 12, 13 or 19.2 MHz. So we should have code that produces:
228 *
229 * XOR MHz Divider Prescaler
230 * 12 1 0
231 * 13 2 1
232 * 19.2 2 1
233 */
234 if (fclk_rate > 12000000)
235 psc = fclk_rate / 12000000;
236 }
237
238 /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */
239 omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc);
240
241 /* Program desired operating rate */
242 fclk_rate /= (psc + 1) * 1000;
243 if (psc > 2)
244 psc = 2;
245
246 omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG,
247 fclk_rate / (clock * 2) - 7 + psc);
248 omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG,
249 fclk_rate / (clock * 2) - 7 + psc);
250
251 /* Take the I2C module out of reset: */
252 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
253
254 /* Enable interrupts */
255 omap_i2c_write_reg(dev, OMAP_I2C_IE_REG,
256 (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY |
257 OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK |
258 OMAP_I2C_IE_AL));
259 return 0;
260 }
261
262 /*
263 * Waiting on Bus Busy
264 */
265 static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev)
266 {
267 unsigned long timeout;
268
269 timeout = jiffies + OMAP_I2C_TIMEOUT;
270 while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) {
271 if (time_after(jiffies, timeout)) {
272 dev_warn(dev->dev, "timeout waiting for bus ready\n");
273 return -ETIMEDOUT;
274 }
275 msleep(1);
276 }
277
278 return 0;
279 }
280
281 /*
282 * Low level master read/write transaction.
283 */
284 static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
285 struct i2c_msg *msg, int stop)
286 {
287 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
288 int r;
289 u16 w;
290
291 dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
292 msg->addr, msg->len, msg->flags, stop);
293
294 if (msg->len == 0)
295 return -EINVAL;
296
297 omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr);
298
299 /* REVISIT: Could the STB bit of I2C_CON be used with probing? */
300 dev->buf = msg->buf;
301 dev->buf_len = msg->len;
302
303 omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
304
305 init_completion(&dev->cmd_complete);
306 dev->cmd_err = 0;
307
308 w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT;
309 if (msg->flags & I2C_M_TEN)
310 w |= OMAP_I2C_CON_XA;
311 if (!(msg->flags & I2C_M_RD))
312 w |= OMAP_I2C_CON_TRX;
313 if (stop)
314 w |= OMAP_I2C_CON_STP;
315 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
316
317 r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
318 OMAP_I2C_TIMEOUT);
319 dev->buf_len = 0;
320 if (r < 0)
321 return r;
322 if (r == 0) {
323 dev_err(dev->dev, "controller timed out\n");
324 omap_i2c_init(dev);
325 return -ETIMEDOUT;
326 }
327
328 if (likely(!dev->cmd_err))
329 return 0;
330
331 /* We have an error */
332 if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR |
333 OMAP_I2C_STAT_XUDF)) {
334 omap_i2c_init(dev);
335 return -EIO;
336 }
337
338 if (dev->cmd_err & OMAP_I2C_STAT_NACK) {
339 if (msg->flags & I2C_M_IGNORE_NAK)
340 return 0;
341 if (stop) {
342 w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
343 w |= OMAP_I2C_CON_STP;
344 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
345 }
346 return -EREMOTEIO;
347 }
348 return -EIO;
349 }
350
351
352 /*
353 * Prepare controller for a transaction and call omap_i2c_xfer_msg
354 * to do the work during IRQ processing.
355 */
356 static int
357 omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
358 {
359 struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
360 int i;
361 int r;
362
363 omap_i2c_enable_clocks(dev);
364
365 /* REVISIT: initialize and use adap->retries. This is an optional
366 * feature */
367 if ((r = omap_i2c_wait_for_bb(dev)) < 0)
368 goto out;
369
370 for (i = 0; i < num; i++) {
371 r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1)));
372 if (r != 0)
373 break;
374 }
375
376 if (r == 0)
377 r = num;
378 out:
379 omap_i2c_disable_clocks(dev);
380 return r;
381 }
382
383 static u32
384 omap_i2c_func(struct i2c_adapter *adap)
385 {
386 return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
387 }
388
389 static inline void
390 omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err)
391 {
392 dev->cmd_err |= err;
393 complete(&dev->cmd_complete);
394 }
395
396 static inline void
397 omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat)
398 {
399 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
400 }
401
402 static irqreturn_t
403 omap_i2c_rev1_isr(int this_irq, void *dev_id)
404 {
405 struct omap_i2c_dev *dev = dev_id;
406 u16 iv, w;
407
408 iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG);
409 switch (iv) {
410 case 0x00: /* None */
411 break;
412 case 0x01: /* Arbitration lost */
413 dev_err(dev->dev, "Arbitration lost\n");
414 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
415 break;
416 case 0x02: /* No acknowledgement */
417 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
418 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP);
419 break;
420 case 0x03: /* Register access ready */
421 omap_i2c_complete_cmd(dev, 0);
422 break;
423 case 0x04: /* Receive data ready */
424 if (dev->buf_len) {
425 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
426 *dev->buf++ = w;
427 dev->buf_len--;
428 if (dev->buf_len) {
429 *dev->buf++ = w >> 8;
430 dev->buf_len--;
431 }
432 } else
433 dev_err(dev->dev, "RRDY IRQ while no data requested\n");
434 break;
435 case 0x05: /* Transmit data ready */
436 if (dev->buf_len) {
437 w = *dev->buf++;
438 dev->buf_len--;
439 if (dev->buf_len) {
440 w |= *dev->buf++ << 8;
441 dev->buf_len--;
442 }
443 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
444 } else
445 dev_err(dev->dev, "XRDY IRQ while no data to send\n");
446 break;
447 default:
448 return IRQ_NONE;
449 }
450
451 return IRQ_HANDLED;
452 }
453
454 static irqreturn_t
455 omap_i2c_isr(int this_irq, void *dev_id)
456 {
457 struct omap_i2c_dev *dev = dev_id;
458 u16 bits;
459 u16 stat, w;
460 int count = 0;
461
462 bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
463 while ((stat = (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG))) & bits) {
464 dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat);
465 if (count++ == 100) {
466 dev_warn(dev->dev, "Too much work in one IRQ\n");
467 break;
468 }
469
470 omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat);
471
472 if (stat & OMAP_I2C_STAT_ARDY) {
473 omap_i2c_complete_cmd(dev, 0);
474 continue;
475 }
476 if (stat & OMAP_I2C_STAT_RRDY) {
477 w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
478 if (dev->buf_len) {
479 *dev->buf++ = w;
480 dev->buf_len--;
481 if (dev->buf_len) {
482 *dev->buf++ = w >> 8;
483 dev->buf_len--;
484 }
485 } else
486 dev_err(dev->dev, "RRDY IRQ while no data"
487 "requested\n");
488 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY);
489 continue;
490 }
491 if (stat & OMAP_I2C_STAT_XRDY) {
492 w = 0;
493 if (dev->buf_len) {
494 w = *dev->buf++;
495 dev->buf_len--;
496 if (dev->buf_len) {
497 w |= *dev->buf++ << 8;
498 dev->buf_len--;
499 }
500 } else
501 dev_err(dev->dev, "XRDY IRQ while no"
502 "data to send\n");
503 omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
504 omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY);
505 continue;
506 }
507 if (stat & OMAP_I2C_STAT_ROVR) {
508 dev_err(dev->dev, "Receive overrun\n");
509 dev->cmd_err |= OMAP_I2C_STAT_ROVR;
510 }
511 if (stat & OMAP_I2C_STAT_XUDF) {
512 dev_err(dev->dev, "Transmit overflow\n");
513 dev->cmd_err |= OMAP_I2C_STAT_XUDF;
514 }
515 if (stat & OMAP_I2C_STAT_NACK) {
516 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK);
517 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG,
518 OMAP_I2C_CON_STP);
519 }
520 if (stat & OMAP_I2C_STAT_AL) {
521 dev_err(dev->dev, "Arbitration lost\n");
522 omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL);
523 }
524 }
525
526 return count ? IRQ_HANDLED : IRQ_NONE;
527 }
528
529 static const struct i2c_algorithm omap_i2c_algo = {
530 .master_xfer = omap_i2c_xfer,
531 .functionality = omap_i2c_func,
532 };
533
534 static int
535 omap_i2c_probe(struct platform_device *pdev)
536 {
537 struct omap_i2c_dev *dev;
538 struct i2c_adapter *adap;
539 struct resource *mem, *irq, *ioarea;
540 int r;
541
542 /* NOTE: driver uses the static register mapping */
543 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
544 if (!mem) {
545 dev_err(&pdev->dev, "no mem resource?\n");
546 return -ENODEV;
547 }
548 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
549 if (!irq) {
550 dev_err(&pdev->dev, "no irq resource?\n");
551 return -ENODEV;
552 }
553
554 ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
555 pdev->name);
556 if (!ioarea) {
557 dev_err(&pdev->dev, "I2C region already claimed\n");
558 return -EBUSY;
559 }
560
561 if (clock > 200)
562 clock = 400; /* Fast mode */
563 else
564 clock = 100; /* Standard mode */
565
566 dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL);
567 if (!dev) {
568 r = -ENOMEM;
569 goto err_release_region;
570 }
571
572 dev->dev = &pdev->dev;
573 dev->irq = irq->start;
574 dev->base = (void __iomem *) IO_ADDRESS(mem->start);
575 platform_set_drvdata(pdev, dev);
576
577 if ((r = omap_i2c_get_clocks(dev)) != 0)
578 goto err_free_mem;
579
580 omap_i2c_enable_clocks(dev);
581
582 if (cpu_is_omap15xx())
583 dev->rev1 = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) < 0x20;
584
585 /* reset ASAP, clearing any IRQs */
586 omap_i2c_init(dev);
587
588 r = request_irq(dev->irq, dev->rev1 ? omap_i2c_rev1_isr : omap_i2c_isr,
589 0, pdev->name, dev);
590
591 if (r) {
592 dev_err(dev->dev, "failure requesting irq %i\n", dev->irq);
593 goto err_unuse_clocks;
594 }
595 r = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff;
596 dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
597 pdev->id, r >> 4, r & 0xf, clock);
598
599 adap = &dev->adapter;
600 i2c_set_adapdata(adap, dev);
601 adap->owner = THIS_MODULE;
602 adap->class = I2C_CLASS_HWMON;
603 strncpy(adap->name, "OMAP I2C adapter", sizeof(adap->name));
604 adap->algo = &omap_i2c_algo;
605 adap->dev.parent = &pdev->dev;
606
607 /* i2c device drivers may be active on return from add_adapter() */
608 adap->nr = pdev->id;
609 r = i2c_add_numbered_adapter(adap);
610 if (r) {
611 dev_err(dev->dev, "failure adding adapter\n");
612 goto err_free_irq;
613 }
614
615 omap_i2c_disable_clocks(dev);
616
617 return 0;
618
619 err_free_irq:
620 free_irq(dev->irq, dev);
621 err_unuse_clocks:
622 omap_i2c_disable_clocks(dev);
623 omap_i2c_put_clocks(dev);
624 err_free_mem:
625 platform_set_drvdata(pdev, NULL);
626 kfree(dev);
627 err_release_region:
628 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
629 release_mem_region(mem->start, (mem->end - mem->start) + 1);
630
631 return r;
632 }
633
634 static int
635 omap_i2c_remove(struct platform_device *pdev)
636 {
637 struct omap_i2c_dev *dev = platform_get_drvdata(pdev);
638 struct resource *mem;
639
640 platform_set_drvdata(pdev, NULL);
641
642 free_irq(dev->irq, dev);
643 i2c_del_adapter(&dev->adapter);
644 omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0);
645 omap_i2c_put_clocks(dev);
646 kfree(dev);
647 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
648 release_mem_region(mem->start, (mem->end - mem->start) + 1);
649 return 0;
650 }
651
652 static struct platform_driver omap_i2c_driver = {
653 .probe = omap_i2c_probe,
654 .remove = omap_i2c_remove,
655 .driver = {
656 .name = "i2c_omap",
657 .owner = THIS_MODULE,
658 },
659 };
660
661 /* I2C may be needed to bring up other drivers */
662 static int __init
663 omap_i2c_init_driver(void)
664 {
665 return platform_driver_register(&omap_i2c_driver);
666 }
667 subsys_initcall(omap_i2c_init_driver);
668
669 static void __exit omap_i2c_exit_driver(void)
670 {
671 platform_driver_unregister(&omap_i2c_driver);
672 }
673 module_exit(omap_i2c_exit_driver);
674
675 MODULE_AUTHOR("MontaVista Software, Inc. (and others)");
676 MODULE_DESCRIPTION("TI OMAP I2C bus adapter");
677 MODULE_LICENSE("GPL");
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