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1da177e4 LT |
1 | /* ------------------------------------------------------------------------- */ |
2 | /* i2c-iop3xx.c i2c driver algorithms for Intel XScale IOP3xx & IXP46x */ | |
3 | /* ------------------------------------------------------------------------- */ | |
4 | /* Copyright (C) 2003 Peter Milne, D-TACQ Solutions Ltd | |
5 | * <Peter dot Milne at D hyphen TACQ dot com> | |
6 | * | |
7 | * With acknowledgements to i2c-algo-ibm_ocp.c by | |
8 | * Ian DaSilva, MontaVista Software, Inc. idasilva@mvista.com | |
9 | * | |
10 | * And i2c-algo-pcf.c, which was created by Simon G. Vogl and Hans Berglund: | |
11 | * | |
12 | * Copyright (C) 1995-1997 Simon G. Vogl, 1998-2000 Hans Berglund | |
13 | * | |
fbd9a6d7 | 14 | * And which acknowledged Kyösti Mälkki <kmalkki@cc.hut.fi>, |
1da177e4 LT |
15 | * Frodo Looijaard <frodol@dds.nl>, Martin Bailey<mbailey@littlefeet-inc.com> |
16 | * | |
17 | * Major cleanup by Deepak Saxena <dsaxena@plexity.net>, 01/2005: | |
18 | * | |
19 | * - Use driver model to pass per-chip info instead of hardcoding and #ifdefs | |
20 | * - Use ioremap/__raw_readl/__raw_writel instead of direct dereference | |
21 | * - Make it work with IXP46x chips | |
22 | * - Cleanup function names, coding style, etc | |
23 | * | |
24 | * This program is free software; you can redistribute it and/or modify | |
25 | * it under the terms of the GNU General Public License as published by | |
26 | * the Free Software Foundation, version 2. | |
27 | */ | |
28 | ||
29 | #include <linux/config.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/sched.h> | |
d052d1be | 38 | #include <linux/platform_device.h> |
1da177e4 LT |
39 | #include <linux/i2c.h> |
40 | ||
41 | #include <asm/io.h> | |
42 | ||
43 | #include "i2c-iop3xx.h" | |
44 | ||
45 | /* global unit counter */ | |
60507095 | 46 | static int i2c_id; |
1da177e4 LT |
47 | |
48 | static inline unsigned char | |
49 | iic_cook_addr(struct i2c_msg *msg) | |
50 | { | |
51 | unsigned char addr; | |
52 | ||
53 | addr = (msg->addr << 1); | |
54 | ||
55 | if (msg->flags & I2C_M_RD) | |
56 | addr |= 1; | |
57 | ||
58 | /* | |
59 | * Read or Write? | |
60 | */ | |
61 | if (msg->flags & I2C_M_REV_DIR_ADDR) | |
62 | addr ^= 1; | |
63 | ||
64 | return addr; | |
65 | } | |
66 | ||
67 | static void | |
68 | iop3xx_i2c_reset(struct i2c_algo_iop3xx_data *iop3xx_adap) | |
69 | { | |
70 | /* Follows devman 9.3 */ | |
71 | __raw_writel(IOP3XX_ICR_UNIT_RESET, iop3xx_adap->ioaddr + CR_OFFSET); | |
72 | __raw_writel(IOP3XX_ISR_CLEARBITS, iop3xx_adap->ioaddr + SR_OFFSET); | |
73 | __raw_writel(0, iop3xx_adap->ioaddr + CR_OFFSET); | |
74 | } | |
75 | ||
76 | static void | |
77 | iop3xx_i2c_set_slave_addr(struct i2c_algo_iop3xx_data *iop3xx_adap) | |
78 | { | |
79 | __raw_writel(MYSAR, iop3xx_adap->ioaddr + SAR_OFFSET); | |
80 | } | |
81 | ||
82 | static void | |
83 | iop3xx_i2c_enable(struct i2c_algo_iop3xx_data *iop3xx_adap) | |
84 | { | |
85 | u32 cr = IOP3XX_ICR_GCD | IOP3XX_ICR_SCLEN | IOP3XX_ICR_UE; | |
86 | ||
87 | /* | |
44bbe87e | 88 | * Every time unit enable is asserted, GPOD needs to be cleared |
1da177e4 LT |
89 | * on IOP321 to avoid data corruption on the bus. |
90 | */ | |
91 | #ifdef CONFIG_ARCH_IOP321 | |
92 | #define IOP321_GPOD_I2C0 0x00c0 /* clear these bits to enable ch0 */ | |
93 | #define IOP321_GPOD_I2C1 0x0030 /* clear these bits to enable ch1 */ | |
94 | ||
95 | *IOP321_GPOD &= (iop3xx_adap->id == 0) ? ~IOP321_GPOD_I2C0 : | |
96 | ~IOP321_GPOD_I2C1; | |
97 | #endif | |
98 | /* NB SR bits not same position as CR IE bits :-( */ | |
99 | iop3xx_adap->SR_enabled = | |
100 | IOP3XX_ISR_ALD | IOP3XX_ISR_BERRD | | |
101 | IOP3XX_ISR_RXFULL | IOP3XX_ISR_TXEMPTY; | |
102 | ||
103 | cr |= IOP3XX_ICR_ALD_IE | IOP3XX_ICR_BERR_IE | | |
104 | IOP3XX_ICR_RXFULL_IE | IOP3XX_ICR_TXEMPTY_IE; | |
105 | ||
106 | __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET); | |
107 | } | |
108 | ||
109 | static void | |
110 | iop3xx_i2c_transaction_cleanup(struct i2c_algo_iop3xx_data *iop3xx_adap) | |
111 | { | |
112 | unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET); | |
113 | ||
114 | cr &= ~(IOP3XX_ICR_MSTART | IOP3XX_ICR_TBYTE | | |
115 | IOP3XX_ICR_MSTOP | IOP3XX_ICR_SCLEN); | |
116 | ||
117 | __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET); | |
118 | } | |
119 | ||
120 | /* | |
121 | * NB: the handler has to clear the source of the interrupt! | |
122 | * Then it passes the SR flags of interest to BH via adap data | |
123 | */ | |
124 | static irqreturn_t | |
125 | iop3xx_i2c_irq_handler(int this_irq, void *dev_id, struct pt_regs *regs) | |
126 | { | |
127 | struct i2c_algo_iop3xx_data *iop3xx_adap = dev_id; | |
128 | u32 sr = __raw_readl(iop3xx_adap->ioaddr + SR_OFFSET); | |
129 | ||
130 | if ((sr &= iop3xx_adap->SR_enabled)) { | |
131 | __raw_writel(sr, iop3xx_adap->ioaddr + SR_OFFSET); | |
132 | iop3xx_adap->SR_received |= sr; | |
133 | wake_up_interruptible(&iop3xx_adap->waitq); | |
134 | } | |
135 | return IRQ_HANDLED; | |
136 | } | |
137 | ||
138 | /* check all error conditions, clear them , report most important */ | |
139 | static int | |
140 | iop3xx_i2c_error(u32 sr) | |
141 | { | |
142 | int rc = 0; | |
143 | ||
144 | if ((sr & IOP3XX_ISR_BERRD)) { | |
145 | if ( !rc ) rc = -I2C_ERR_BERR; | |
146 | } | |
147 | if ((sr & IOP3XX_ISR_ALD)) { | |
148 | if ( !rc ) rc = -I2C_ERR_ALD; | |
149 | } | |
150 | return rc; | |
151 | } | |
152 | ||
153 | static inline u32 | |
154 | iop3xx_i2c_get_srstat(struct i2c_algo_iop3xx_data *iop3xx_adap) | |
155 | { | |
156 | unsigned long flags; | |
157 | u32 sr; | |
158 | ||
159 | spin_lock_irqsave(&iop3xx_adap->lock, flags); | |
160 | sr = iop3xx_adap->SR_received; | |
161 | iop3xx_adap->SR_received = 0; | |
162 | spin_unlock_irqrestore(&iop3xx_adap->lock, flags); | |
163 | ||
164 | return sr; | |
165 | } | |
166 | ||
167 | /* | |
168 | * sleep until interrupted, then recover and analyse the SR | |
169 | * saved by handler | |
170 | */ | |
171 | typedef int (* compare_func)(unsigned test, unsigned mask); | |
172 | /* returns 1 on correct comparison */ | |
173 | ||
174 | static int | |
175 | iop3xx_i2c_wait_event(struct i2c_algo_iop3xx_data *iop3xx_adap, | |
176 | unsigned flags, unsigned* status, | |
177 | compare_func compare) | |
178 | { | |
179 | unsigned sr = 0; | |
180 | int interrupted; | |
181 | int done; | |
182 | int rc = 0; | |
183 | ||
184 | do { | |
185 | interrupted = wait_event_interruptible_timeout ( | |
186 | iop3xx_adap->waitq, | |
fbd9a6d7 | 187 | (done = compare( sr = iop3xx_i2c_get_srstat(iop3xx_adap) ,flags )), |
1da177e4 LT |
188 | 1 * HZ; |
189 | ); | |
190 | if ((rc = iop3xx_i2c_error(sr)) < 0) { | |
191 | *status = sr; | |
192 | return rc; | |
193 | } else if (!interrupted) { | |
194 | *status = sr; | |
195 | return -ETIMEDOUT; | |
196 | } | |
197 | } while(!done); | |
198 | ||
199 | *status = sr; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Concrete compare_funcs | |
206 | */ | |
207 | static int | |
208 | all_bits_clear(unsigned test, unsigned mask) | |
209 | { | |
210 | return (test & mask) == 0; | |
211 | } | |
212 | ||
213 | static int | |
214 | any_bits_set(unsigned test, unsigned mask) | |
215 | { | |
216 | return (test & mask) != 0; | |
217 | } | |
218 | ||
219 | static int | |
220 | iop3xx_i2c_wait_tx_done(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status) | |
221 | { | |
222 | return iop3xx_i2c_wait_event( | |
223 | iop3xx_adap, | |
224 | IOP3XX_ISR_TXEMPTY | IOP3XX_ISR_ALD | IOP3XX_ISR_BERRD, | |
225 | status, any_bits_set); | |
226 | } | |
227 | ||
228 | static int | |
229 | iop3xx_i2c_wait_rx_done(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status) | |
230 | { | |
231 | return iop3xx_i2c_wait_event( | |
232 | iop3xx_adap, | |
233 | IOP3XX_ISR_RXFULL | IOP3XX_ISR_ALD | IOP3XX_ISR_BERRD, | |
234 | status, any_bits_set); | |
235 | } | |
236 | ||
237 | static int | |
238 | iop3xx_i2c_wait_idle(struct i2c_algo_iop3xx_data *iop3xx_adap, int *status) | |
239 | { | |
240 | return iop3xx_i2c_wait_event( | |
241 | iop3xx_adap, IOP3XX_ISR_UNITBUSY, status, all_bits_clear); | |
242 | } | |
243 | ||
244 | static int | |
245 | iop3xx_i2c_send_target_addr(struct i2c_algo_iop3xx_data *iop3xx_adap, | |
246 | struct i2c_msg* msg) | |
247 | { | |
248 | unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET); | |
249 | int status; | |
250 | int rc; | |
251 | ||
252 | __raw_writel(iic_cook_addr(msg), iop3xx_adap->ioaddr + DBR_OFFSET); | |
253 | ||
254 | cr &= ~(IOP3XX_ICR_MSTOP | IOP3XX_ICR_NACK); | |
255 | cr |= IOP3XX_ICR_MSTART | IOP3XX_ICR_TBYTE; | |
256 | ||
257 | __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET); | |
258 | rc = iop3xx_i2c_wait_tx_done(iop3xx_adap, &status); | |
259 | ||
260 | return rc; | |
261 | } | |
262 | ||
263 | static int | |
264 | iop3xx_i2c_write_byte(struct i2c_algo_iop3xx_data *iop3xx_adap, char byte, | |
265 | int stop) | |
266 | { | |
267 | unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET); | |
268 | int status; | |
269 | int rc = 0; | |
270 | ||
271 | __raw_writel(byte, iop3xx_adap->ioaddr + DBR_OFFSET); | |
272 | cr &= ~IOP3XX_ICR_MSTART; | |
273 | if (stop) { | |
274 | cr |= IOP3XX_ICR_MSTOP; | |
275 | } else { | |
276 | cr &= ~IOP3XX_ICR_MSTOP; | |
277 | } | |
278 | cr |= IOP3XX_ICR_TBYTE; | |
279 | __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET); | |
280 | rc = iop3xx_i2c_wait_tx_done(iop3xx_adap, &status); | |
281 | ||
282 | return rc; | |
283 | } | |
284 | ||
285 | static int | |
286 | iop3xx_i2c_read_byte(struct i2c_algo_iop3xx_data *iop3xx_adap, char* byte, | |
287 | int stop) | |
288 | { | |
289 | unsigned long cr = __raw_readl(iop3xx_adap->ioaddr + CR_OFFSET); | |
290 | int status; | |
291 | int rc = 0; | |
292 | ||
293 | cr &= ~IOP3XX_ICR_MSTART; | |
294 | ||
295 | if (stop) { | |
296 | cr |= IOP3XX_ICR_MSTOP | IOP3XX_ICR_NACK; | |
297 | } else { | |
298 | cr &= ~(IOP3XX_ICR_MSTOP | IOP3XX_ICR_NACK); | |
299 | } | |
300 | cr |= IOP3XX_ICR_TBYTE; | |
301 | __raw_writel(cr, iop3xx_adap->ioaddr + CR_OFFSET); | |
302 | ||
303 | rc = iop3xx_i2c_wait_rx_done(iop3xx_adap, &status); | |
304 | ||
305 | *byte = __raw_readl(iop3xx_adap->ioaddr + DBR_OFFSET); | |
306 | ||
307 | return rc; | |
308 | } | |
309 | ||
310 | static int | |
311 | iop3xx_i2c_writebytes(struct i2c_adapter *i2c_adap, const char *buf, int count) | |
312 | { | |
313 | struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data; | |
314 | int ii; | |
315 | int rc = 0; | |
316 | ||
317 | for (ii = 0; rc == 0 && ii != count; ++ii) | |
318 | rc = iop3xx_i2c_write_byte(iop3xx_adap, buf[ii], ii==count-1); | |
319 | return rc; | |
320 | } | |
321 | ||
322 | static int | |
323 | iop3xx_i2c_readbytes(struct i2c_adapter *i2c_adap, char *buf, int count) | |
324 | { | |
325 | struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data; | |
326 | int ii; | |
327 | int rc = 0; | |
328 | ||
329 | for (ii = 0; rc == 0 && ii != count; ++ii) | |
330 | rc = iop3xx_i2c_read_byte(iop3xx_adap, &buf[ii], ii==count-1); | |
331 | ||
332 | return rc; | |
333 | } | |
334 | ||
335 | /* | |
336 | * Description: This function implements combined transactions. Combined | |
337 | * transactions consist of combinations of reading and writing blocks of data. | |
338 | * FROM THE SAME ADDRESS | |
339 | * Each transfer (i.e. a read or a write) is separated by a repeated start | |
340 | * condition. | |
341 | */ | |
342 | static int | |
343 | iop3xx_i2c_handle_msg(struct i2c_adapter *i2c_adap, struct i2c_msg* pmsg) | |
344 | { | |
345 | struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data; | |
346 | int rc; | |
347 | ||
348 | rc = iop3xx_i2c_send_target_addr(iop3xx_adap, pmsg); | |
349 | if (rc < 0) { | |
350 | return rc; | |
351 | } | |
352 | ||
353 | if ((pmsg->flags&I2C_M_RD)) { | |
354 | return iop3xx_i2c_readbytes(i2c_adap, pmsg->buf, pmsg->len); | |
355 | } else { | |
356 | return iop3xx_i2c_writebytes(i2c_adap, pmsg->buf, pmsg->len); | |
357 | } | |
358 | } | |
359 | ||
360 | /* | |
361 | * master_xfer() - main read/write entry | |
362 | */ | |
363 | static int | |
364 | iop3xx_i2c_master_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, | |
365 | int num) | |
366 | { | |
367 | struct i2c_algo_iop3xx_data *iop3xx_adap = i2c_adap->algo_data; | |
368 | int im = 0; | |
369 | int ret = 0; | |
370 | int status; | |
371 | ||
372 | iop3xx_i2c_wait_idle(iop3xx_adap, &status); | |
373 | iop3xx_i2c_reset(iop3xx_adap); | |
374 | iop3xx_i2c_enable(iop3xx_adap); | |
375 | ||
376 | for (im = 0; ret == 0 && im != num; im++) { | |
377 | ret = iop3xx_i2c_handle_msg(i2c_adap, &msgs[im]); | |
378 | } | |
379 | ||
380 | iop3xx_i2c_transaction_cleanup(iop3xx_adap); | |
381 | ||
382 | if(ret) | |
383 | return ret; | |
384 | ||
385 | return im; | |
386 | } | |
387 | ||
388 | static int | |
389 | iop3xx_i2c_algo_control(struct i2c_adapter *adapter, unsigned int cmd, | |
390 | unsigned long arg) | |
391 | { | |
392 | return 0; | |
393 | } | |
394 | ||
395 | static u32 | |
396 | iop3xx_i2c_func(struct i2c_adapter *adap) | |
397 | { | |
398 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; | |
399 | } | |
400 | ||
401 | static struct i2c_algorithm iop3xx_i2c_algo = { | |
1da177e4 LT |
402 | .master_xfer = iop3xx_i2c_master_xfer, |
403 | .algo_control = iop3xx_i2c_algo_control, | |
404 | .functionality = iop3xx_i2c_func, | |
405 | }; | |
406 | ||
407 | static int | |
408 | iop3xx_i2c_remove(struct device *device) | |
409 | { | |
410 | struct platform_device *pdev = to_platform_device(device); | |
411 | struct i2c_adapter *padapter = dev_get_drvdata(&pdev->dev); | |
412 | struct i2c_algo_iop3xx_data *adapter_data = | |
413 | (struct i2c_algo_iop3xx_data *)padapter->algo_data; | |
414 | struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
415 | unsigned long cr = __raw_readl(adapter_data->ioaddr + CR_OFFSET); | |
416 | ||
417 | /* | |
418 | * Disable the actual HW unit | |
419 | */ | |
420 | cr &= ~(IOP3XX_ICR_ALD_IE | IOP3XX_ICR_BERR_IE | | |
421 | IOP3XX_ICR_RXFULL_IE | IOP3XX_ICR_TXEMPTY_IE); | |
422 | __raw_writel(cr, adapter_data->ioaddr + CR_OFFSET); | |
423 | ||
424 | iounmap((void __iomem*)adapter_data->ioaddr); | |
425 | release_mem_region(res->start, IOP3XX_I2C_IO_SIZE); | |
426 | kfree(adapter_data); | |
427 | kfree(padapter); | |
428 | ||
429 | dev_set_drvdata(&pdev->dev, NULL); | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static int | |
435 | iop3xx_i2c_probe(struct device *dev) | |
436 | { | |
437 | struct platform_device *pdev = to_platform_device(dev); | |
438 | struct resource *res; | |
439 | int ret; | |
440 | struct i2c_adapter *new_adapter; | |
441 | struct i2c_algo_iop3xx_data *adapter_data; | |
442 | ||
5263ebb5 | 443 | new_adapter = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL); |
1da177e4 LT |
444 | if (!new_adapter) { |
445 | ret = -ENOMEM; | |
446 | goto out; | |
447 | } | |
1da177e4 | 448 | |
5263ebb5 | 449 | adapter_data = kzalloc(sizeof(struct i2c_algo_iop3xx_data), GFP_KERNEL); |
1da177e4 LT |
450 | if (!adapter_data) { |
451 | ret = -ENOMEM; | |
452 | goto free_adapter; | |
453 | } | |
1da177e4 LT |
454 | |
455 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
456 | if (!res) { | |
457 | ret = -ENODEV; | |
458 | goto free_both; | |
459 | } | |
460 | ||
461 | if (!request_mem_region(res->start, IOP3XX_I2C_IO_SIZE, pdev->name)) { | |
462 | ret = -EBUSY; | |
463 | goto free_both; | |
464 | } | |
465 | ||
466 | /* set the adapter enumeration # */ | |
467 | adapter_data->id = i2c_id++; | |
468 | ||
469 | adapter_data->ioaddr = (u32)ioremap(res->start, IOP3XX_I2C_IO_SIZE); | |
470 | if (!adapter_data->ioaddr) { | |
471 | ret = -ENOMEM; | |
472 | goto release_region; | |
473 | } | |
474 | ||
fbd9a6d7 | 475 | ret = request_irq(platform_get_irq(pdev, 0), iop3xx_i2c_irq_handler, 0, |
1da177e4 | 476 | pdev->name, adapter_data); |
fbd9a6d7 DW |
477 | |
478 | if (ret) { | |
1da177e4 LT |
479 | ret = -EIO; |
480 | goto unmap; | |
481 | } | |
482 | ||
483 | memcpy(new_adapter->name, pdev->name, strlen(pdev->name)); | |
484 | new_adapter->id = I2C_HW_IOP3XX; | |
485 | new_adapter->owner = THIS_MODULE; | |
486 | new_adapter->dev.parent = &pdev->dev; | |
487 | ||
488 | /* | |
489 | * Default values...should these come in from board code? | |
490 | */ | |
491 | new_adapter->timeout = 100; | |
492 | new_adapter->retries = 3; | |
493 | new_adapter->algo = &iop3xx_i2c_algo; | |
494 | ||
495 | init_waitqueue_head(&adapter_data->waitq); | |
496 | spin_lock_init(&adapter_data->lock); | |
497 | ||
498 | iop3xx_i2c_reset(adapter_data); | |
499 | iop3xx_i2c_set_slave_addr(adapter_data); | |
500 | iop3xx_i2c_enable(adapter_data); | |
501 | ||
502 | dev_set_drvdata(&pdev->dev, new_adapter); | |
503 | new_adapter->algo_data = adapter_data; | |
504 | ||
505 | i2c_add_adapter(new_adapter); | |
506 | ||
507 | return 0; | |
508 | ||
509 | unmap: | |
510 | iounmap((void __iomem*)adapter_data->ioaddr); | |
511 | ||
512 | release_region: | |
513 | release_mem_region(res->start, IOP3XX_I2C_IO_SIZE); | |
514 | ||
515 | free_both: | |
516 | kfree(adapter_data); | |
517 | ||
518 | free_adapter: | |
519 | kfree(new_adapter); | |
520 | ||
521 | out: | |
522 | return ret; | |
523 | } | |
524 | ||
525 | ||
526 | static struct device_driver iop3xx_i2c_driver = { | |
0cf36281 | 527 | .owner = THIS_MODULE, |
1da177e4 LT |
528 | .name = "IOP3xx-I2C", |
529 | .bus = &platform_bus_type, | |
530 | .probe = iop3xx_i2c_probe, | |
531 | .remove = iop3xx_i2c_remove | |
532 | }; | |
533 | ||
534 | static int __init | |
535 | i2c_iop3xx_init (void) | |
536 | { | |
537 | return driver_register(&iop3xx_i2c_driver); | |
538 | } | |
539 | ||
540 | static void __exit | |
541 | i2c_iop3xx_exit (void) | |
542 | { | |
543 | driver_unregister(&iop3xx_i2c_driver); | |
544 | return; | |
545 | } | |
546 | ||
547 | module_init (i2c_iop3xx_init); | |
548 | module_exit (i2c_iop3xx_exit); | |
549 | ||
550 | MODULE_AUTHOR("D-TACQ Solutions Ltd <www.d-tacq.com>"); | |
551 | MODULE_DESCRIPTION("IOP3xx iic algorithm and driver"); | |
552 | MODULE_LICENSE("GPL"); |