blob: 8152e9f516b0786d04d358c4921f50924431ca62 [file] [log] [blame]
Anton Vorontsovaeec56e2010-10-27 15:33:15 -07001/*
2 * Driver for basic memory-mapped GPIO controllers.
3 *
4 * Copyright 2008 MontaVista Software, Inc.
5 * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 * ....``.```~~~~````.`.`.`.`.```````'',,,.........`````......`.......
13 * ...`` ```````..
14 * ..The simplest form of a GPIO controller that the driver supports is``
15 * `.just a single "data" register, where GPIO state can be read and/or `
16 * `,..written. ,,..``~~~~ .....``.`.`.~~.```.`.........``````.```````
17 * `````````
18 ___
19_/~~|___/~| . ```~~~~~~ ___/___\___ ,~.`.`.`.`````.~~...,,,,...
20__________|~$@~~~ %~ /o*o*o*o*o*o\ .. Implementing such a GPIO .
21o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`
22 `....trivial..'~`.```.```
23 * ```````
24 * .```````~~~~`..`.``.``.
25 * . The driver supports `... ,..```.`~~~```````````````....````.``,,
26 * . big-endian notation, just`. .. A bit more sophisticated controllers ,
27 * . register the device with -be`. .with a pair of set/clear-bit registers ,
28 * `.. suffix. ```~~`````....`.` . affecting the data register and the .`
29 * ``.`.``...``` ```.. output pins are also supported.`
30 * ^^ `````.`````````.,``~``~``~~``````
31 * . ^^
32 * ,..`.`.`...````````````......`.`.`.`.`.`..`.`.`..
33 * .. The expectation is that in at least some cases . ,-~~~-,
34 * .this will be used with roll-your-own ASIC/FPGA .` \ /
35 * .logic in Verilog or VHDL. ~~~`````````..`````~~` \ /
36 * ..````````......``````````` \o_
37 * |
38 * ^^ / \
39 *
40 * ...`````~~`.....``.`..........``````.`.``.```........``.
41 * ` 8, 16, 32 and 64 bits registers are supported, and``.
42 * . the number of GPIOs is determined by the width of ~
43 * .. the registers. ,............```.`.`..`.`.~~~.`.`.`~
44 * `.......````.```
45 */
46
47#include <linux/init.h>
Jamie Iles280df6b2011-05-20 00:40:19 -060048#include <linux/err.h>
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070049#include <linux/bug.h>
50#include <linux/kernel.h>
51#include <linux/module.h>
52#include <linux/spinlock.h>
53#include <linux/compiler.h>
54#include <linux/types.h>
55#include <linux/errno.h>
56#include <linux/log2.h>
57#include <linux/ioport.h>
58#include <linux/io.h>
59#include <linux/gpio.h>
60#include <linux/slab.h>
61#include <linux/platform_device.h>
62#include <linux/mod_devicetable.h>
63#include <linux/basic_mmio_gpio.h>
64
Jamie Iles8467afe2011-05-20 00:40:14 -060065static void bgpio_write8(void __iomem *reg, unsigned long data)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070066{
Jamie Ilesfd996232011-05-20 00:40:17 -060067 writeb(data, reg);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070068}
69
Jamie Iles8467afe2011-05-20 00:40:14 -060070static unsigned long bgpio_read8(void __iomem *reg)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070071{
Jamie Ilesfd996232011-05-20 00:40:17 -060072 return readb(reg);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -070073}
74
Jamie Iles8467afe2011-05-20 00:40:14 -060075static void bgpio_write16(void __iomem *reg, unsigned long data)
76{
Jamie Ilesfd996232011-05-20 00:40:17 -060077 writew(data, reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060078}
79
80static unsigned long bgpio_read16(void __iomem *reg)
81{
Jamie Ilesfd996232011-05-20 00:40:17 -060082 return readw(reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060083}
84
85static void bgpio_write32(void __iomem *reg, unsigned long data)
86{
Jamie Ilesfd996232011-05-20 00:40:17 -060087 writel(data, reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060088}
89
90static unsigned long bgpio_read32(void __iomem *reg)
91{
Jamie Ilesfd996232011-05-20 00:40:17 -060092 return readl(reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060093}
94
95#if BITS_PER_LONG >= 64
96static void bgpio_write64(void __iomem *reg, unsigned long data)
97{
Jamie Ilesfd996232011-05-20 00:40:17 -060098 writeq(data, reg);
Jamie Iles8467afe2011-05-20 00:40:14 -060099}
100
101static unsigned long bgpio_read64(void __iomem *reg)
102{
Jamie Ilesfd996232011-05-20 00:40:17 -0600103 return readq(reg);
Jamie Iles8467afe2011-05-20 00:40:14 -0600104}
105#endif /* BITS_PER_LONG >= 64 */
106
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700107static unsigned long bgpio_pin2mask(struct bgpio_chip *bgc, unsigned int pin)
108{
Jamie Iles8467afe2011-05-20 00:40:14 -0600109 return 1 << pin;
110}
111
112static unsigned long bgpio_pin2mask_be(struct bgpio_chip *bgc,
113 unsigned int pin)
114{
115 return 1 << (bgc->bits - 1 - pin);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700116}
117
118static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
119{
120 struct bgpio_chip *bgc = to_bgpio_chip(gc);
121
Jamie Iles8467afe2011-05-20 00:40:14 -0600122 return bgc->read_reg(bgc->reg_dat) & bgc->pin2mask(bgc, gpio);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700123}
124
125static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
126{
127 struct bgpio_chip *bgc = to_bgpio_chip(gc);
Jamie Iles8467afe2011-05-20 00:40:14 -0600128 unsigned long mask = bgc->pin2mask(bgc, gpio);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700129 unsigned long flags;
130
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700131 spin_lock_irqsave(&bgc->lock, flags);
132
133 if (val)
134 bgc->data |= mask;
135 else
136 bgc->data &= ~mask;
137
Jamie Iles8467afe2011-05-20 00:40:14 -0600138 bgc->write_reg(bgc->reg_dat, bgc->data);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700139
140 spin_unlock_irqrestore(&bgc->lock, flags);
141}
142
Jamie Ilese027d6f2011-05-20 00:40:16 -0600143static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
144 int val)
145{
146 struct bgpio_chip *bgc = to_bgpio_chip(gc);
147 unsigned long mask = bgc->pin2mask(bgc, gpio);
148
149 if (val)
150 bgc->write_reg(bgc->reg_set, mask);
151 else
152 bgc->write_reg(bgc->reg_clr, mask);
153}
154
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600155static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
156{
157 struct bgpio_chip *bgc = to_bgpio_chip(gc);
158 unsigned long mask = bgc->pin2mask(bgc, gpio);
159 unsigned long flags;
160
161 spin_lock_irqsave(&bgc->lock, flags);
162
163 if (val)
164 bgc->data |= mask;
165 else
166 bgc->data &= ~mask;
167
168 bgc->write_reg(bgc->reg_set, bgc->data);
169
170 spin_unlock_irqrestore(&bgc->lock, flags);
171}
172
Jamie Iles31029112011-05-20 00:40:17 -0600173static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio)
174{
175 return 0;
176}
177
178static int bgpio_simple_dir_out(struct gpio_chip *gc, unsigned int gpio,
179 int val)
180{
181 gc->set(gc, gpio, val);
182
183 return 0;
184}
185
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700186static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
187{
Jamie Iles31029112011-05-20 00:40:17 -0600188 struct bgpio_chip *bgc = to_bgpio_chip(gc);
189 unsigned long flags;
190
191 spin_lock_irqsave(&bgc->lock, flags);
192
193 bgc->dir &= ~bgc->pin2mask(bgc, gpio);
194 bgc->write_reg(bgc->reg_dir, bgc->dir);
195
196 spin_unlock_irqrestore(&bgc->lock, flags);
197
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700198 return 0;
199}
200
201static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
202{
Jamie Iles31029112011-05-20 00:40:17 -0600203 struct bgpio_chip *bgc = to_bgpio_chip(gc);
204 unsigned long flags;
205
Jamie Ilese027d6f2011-05-20 00:40:16 -0600206 gc->set(gc, gpio, val);
207
Jamie Iles31029112011-05-20 00:40:17 -0600208 spin_lock_irqsave(&bgc->lock, flags);
209
210 bgc->dir |= bgc->pin2mask(bgc, gpio);
211 bgc->write_reg(bgc->reg_dir, bgc->dir);
212
213 spin_unlock_irqrestore(&bgc->lock, flags);
214
215 return 0;
216}
217
218static int bgpio_dir_in_inv(struct gpio_chip *gc, unsigned int gpio)
219{
220 struct bgpio_chip *bgc = to_bgpio_chip(gc);
221 unsigned long flags;
222
223 spin_lock_irqsave(&bgc->lock, flags);
224
225 bgc->dir |= bgc->pin2mask(bgc, gpio);
226 bgc->write_reg(bgc->reg_dir, bgc->dir);
227
228 spin_unlock_irqrestore(&bgc->lock, flags);
229
230 return 0;
231}
232
233static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val)
234{
235 struct bgpio_chip *bgc = to_bgpio_chip(gc);
236 unsigned long flags;
237
238 gc->set(gc, gpio, val);
239
240 spin_lock_irqsave(&bgc->lock, flags);
241
242 bgc->dir &= ~bgc->pin2mask(bgc, gpio);
243 bgc->write_reg(bgc->reg_dir, bgc->dir);
244
245 spin_unlock_irqrestore(&bgc->lock, flags);
246
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700247 return 0;
248}
249
Jamie Iles280df6b2011-05-20 00:40:19 -0600250static int bgpio_setup_accessors(struct device *dev,
251 struct bgpio_chip *bgc,
252 bool be)
Jamie Iles364b5e82011-05-20 00:40:16 -0600253{
Jamie Iles8467afe2011-05-20 00:40:14 -0600254
255 switch (bgc->bits) {
256 case 8:
257 bgc->read_reg = bgpio_read8;
258 bgc->write_reg = bgpio_write8;
259 break;
260 case 16:
261 bgc->read_reg = bgpio_read16;
262 bgc->write_reg = bgpio_write16;
263 break;
264 case 32:
265 bgc->read_reg = bgpio_read32;
266 bgc->write_reg = bgpio_write32;
267 break;
268#if BITS_PER_LONG >= 64
269 case 64:
270 bgc->read_reg = bgpio_read64;
271 bgc->write_reg = bgpio_write64;
272 break;
273#endif /* BITS_PER_LONG >= 64 */
274 default:
Jamie Iles280df6b2011-05-20 00:40:19 -0600275 dev_err(dev, "unsupported data width %u bits\n", bgc->bits);
Jamie Iles8467afe2011-05-20 00:40:14 -0600276 return -EINVAL;
277 }
278
Jamie Iles280df6b2011-05-20 00:40:19 -0600279 bgc->pin2mask = be ? bgpio_pin2mask_be : bgpio_pin2mask;
Jamie Iles8467afe2011-05-20 00:40:14 -0600280
281 return 0;
282}
283
Jamie Ilese027d6f2011-05-20 00:40:16 -0600284/*
285 * Create the device and allocate the resources. For setting GPIO's there are
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600286 * three supported configurations:
Jamie Ilese027d6f2011-05-20 00:40:16 -0600287 *
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600288 * - single input/output register resource (named "dat").
Jamie Ilese027d6f2011-05-20 00:40:16 -0600289 * - set/clear pair (named "set" and "clr").
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600290 * - single output register resource and single input resource ("set" and
291 * dat").
Jamie Ilese027d6f2011-05-20 00:40:16 -0600292 *
293 * For the single output register, this drives a 1 by setting a bit and a zero
294 * by clearing a bit. For the set clr pair, this drives a 1 by setting a bit
295 * in the set register and clears it by setting a bit in the clear register.
296 * The configuration is detected by which resources are present.
Jamie Iles31029112011-05-20 00:40:17 -0600297 *
298 * For setting the GPIO direction, there are three supported configurations:
299 *
300 * - simple bidirection GPIO that requires no configuration.
301 * - an output direction register (named "dirout") where a 1 bit
302 * indicates the GPIO is an output.
303 * - an input direction register (named "dirin") where a 1 bit indicates
304 * the GPIO is an input.
Jamie Ilese027d6f2011-05-20 00:40:16 -0600305 */
Jamie Iles280df6b2011-05-20 00:40:19 -0600306static int bgpio_setup_io(struct bgpio_chip *bgc,
307 void __iomem *dat,
308 void __iomem *set,
309 void __iomem *clr)
Jamie Iles8467afe2011-05-20 00:40:14 -0600310{
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700311
Jamie Iles280df6b2011-05-20 00:40:19 -0600312 bgc->reg_dat = dat;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700313 if (!bgc->reg_dat)
Jamie Iles280df6b2011-05-20 00:40:19 -0600314 return -EINVAL;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700315
Jamie Iles280df6b2011-05-20 00:40:19 -0600316 if (set && clr) {
317 bgc->reg_set = set;
318 bgc->reg_clr = clr;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600319 bgc->gc.set = bgpio_set_with_clear;
Jamie Iles280df6b2011-05-20 00:40:19 -0600320 } else if (set && !clr) {
321 bgc->reg_set = set;
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600322 bgc->gc.set = bgpio_set_set;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600323 } else {
324 bgc->gc.set = bgpio_set;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700325 }
326
Jamie Ilesdd86a0c2011-05-20 00:40:16 -0600327 bgc->gc.get = bgpio_get;
328
Jamie Ilese027d6f2011-05-20 00:40:16 -0600329 return 0;
330}
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700331
Jamie Iles280df6b2011-05-20 00:40:19 -0600332static int bgpio_setup_direction(struct bgpio_chip *bgc,
333 void __iomem *dirout,
334 void __iomem *dirin)
Jamie Iles31029112011-05-20 00:40:17 -0600335{
Jamie Iles280df6b2011-05-20 00:40:19 -0600336 if (dirout && dirin) {
Jamie Iles31029112011-05-20 00:40:17 -0600337 return -EINVAL;
Jamie Iles280df6b2011-05-20 00:40:19 -0600338 } else if (dirout) {
339 bgc->reg_dir = dirout;
Jamie Iles31029112011-05-20 00:40:17 -0600340 bgc->gc.direction_output = bgpio_dir_out;
341 bgc->gc.direction_input = bgpio_dir_in;
Jamie Iles280df6b2011-05-20 00:40:19 -0600342 } else if (dirin) {
343 bgc->reg_dir = dirin;
Jamie Iles31029112011-05-20 00:40:17 -0600344 bgc->gc.direction_output = bgpio_dir_out_inv;
345 bgc->gc.direction_input = bgpio_dir_in_inv;
346 } else {
347 bgc->gc.direction_output = bgpio_simple_dir_out;
348 bgc->gc.direction_input = bgpio_simple_dir_in;
349 }
350
351 return 0;
352}
353
Jamie Iles280df6b2011-05-20 00:40:19 -0600354int __devexit bgpio_remove(struct bgpio_chip *bgc)
Jamie Ilese027d6f2011-05-20 00:40:16 -0600355{
Jamie Iles280df6b2011-05-20 00:40:19 -0600356 int err = gpiochip_remove(&bgc->gc);
357
358 kfree(bgc);
359
360 return err;
361}
362EXPORT_SYMBOL_GPL(bgpio_remove);
363
364int __devinit bgpio_init(struct bgpio_chip *bgc,
365 struct device *dev,
366 unsigned long sz,
367 void __iomem *dat,
368 void __iomem *set,
369 void __iomem *clr,
370 void __iomem *dirout,
371 void __iomem *dirin,
372 bool big_endian)
373{
Jamie Ilese027d6f2011-05-20 00:40:16 -0600374 int ret;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600375
Jamie Iles280df6b2011-05-20 00:40:19 -0600376 if (!is_power_of_2(sz))
377 return -EINVAL;
Jamie Ilese027d6f2011-05-20 00:40:16 -0600378
Jamie Iles280df6b2011-05-20 00:40:19 -0600379 bgc->bits = sz * 8;
380 if (bgc->bits > BITS_PER_LONG)
381 return -EINVAL;
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700382
Jamie Ilese027d6f2011-05-20 00:40:16 -0600383 spin_lock_init(&bgc->lock);
Jamie Iles280df6b2011-05-20 00:40:19 -0600384 bgc->gc.dev = dev;
385 bgc->gc.label = dev_name(dev);
386 bgc->gc.base = -1;
387 bgc->gc.ngpio = bgc->bits;
388
389 ret = bgpio_setup_io(bgc, dat, set, clr);
390 if (ret)
391 return ret;
392
393 ret = bgpio_setup_accessors(dev, bgc, big_endian);
394 if (ret)
395 return ret;
396
397 ret = bgpio_setup_direction(bgc, dirout, dirin);
Jamie Iles31029112011-05-20 00:40:17 -0600398 if (ret)
399 return ret;
400
Jamie Iles8467afe2011-05-20 00:40:14 -0600401 bgc->data = bgc->read_reg(bgc->reg_dat);
Jamie Iles924e7a92011-05-20 00:40:15 -0600402
Jamie Iles280df6b2011-05-20 00:40:19 -0600403 return ret;
404}
405EXPORT_SYMBOL_GPL(bgpio_init);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700406
Jamie Iles280df6b2011-05-20 00:40:19 -0600407#ifdef CONFIG_GPIO_BASIC_MMIO
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700408
Jamie Iles280df6b2011-05-20 00:40:19 -0600409static void __iomem *bgpio_map(struct platform_device *pdev,
410 const char *name,
411 resource_size_t sane_sz,
412 int *err)
413{
414 struct device *dev = &pdev->dev;
415 struct resource *r;
416 resource_size_t start;
417 resource_size_t sz;
418 void __iomem *ret;
419
420 *err = 0;
421
422 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
423 if (!r)
424 return NULL;
425
426 sz = resource_size(r);
427 if (sz != sane_sz) {
428 *err = -EINVAL;
429 return NULL;
430 }
431
432 start = r->start;
433 if (!devm_request_mem_region(dev, start, sz, r->name)) {
434 *err = -EBUSY;
435 return NULL;
436 }
437
438 ret = devm_ioremap(dev, start, sz);
439 if (!ret) {
440 *err = -ENOMEM;
441 return NULL;
442 }
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700443
444 return ret;
445}
446
Jamie Iles280df6b2011-05-20 00:40:19 -0600447static int __devinit bgpio_pdev_probe(struct platform_device *pdev)
448{
449 struct device *dev = &pdev->dev;
450 struct resource *r;
451 void __iomem *dat;
452 void __iomem *set;
453 void __iomem *clr;
454 void __iomem *dirout;
455 void __iomem *dirin;
456 unsigned long sz;
457 bool be;
458 int err;
459 struct bgpio_chip *bgc;
460 struct bgpio_pdata *pdata = dev_get_platdata(dev);
461
462 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
463 if (!r)
464 return -EINVAL;
465
466 sz = resource_size(r);
467
468 dat = bgpio_map(pdev, "dat", sz, &err);
469 if (!dat)
470 return err ? err : -EINVAL;
471
472 set = bgpio_map(pdev, "set", sz, &err);
473 if (err)
474 return err;
475
476 clr = bgpio_map(pdev, "clr", sz, &err);
477 if (err)
478 return err;
479
480 dirout = bgpio_map(pdev, "dirout", sz, &err);
481 if (err)
482 return err;
483
484 dirin = bgpio_map(pdev, "dirin", sz, &err);
485 if (err)
486 return err;
487
488 be = !strcmp(platform_get_device_id(pdev)->name, "basic-mmio-gpio-be");
489
490 bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
491 if (!bgc)
492 return -ENOMEM;
493
494 err = bgpio_init(bgc, dev, sz, dat, set, clr, dirout, dirin, be);
495 if (err)
496 return err;
497
498 if (pdata) {
499 bgc->gc.base = pdata->base;
500 if (pdata->ngpio > 0)
501 bgc->gc.ngpio = pdata->ngpio;
502 }
503
504 platform_set_drvdata(pdev, bgc);
505
506 return gpiochip_add(&bgc->gc);
507}
508
509static int __devexit bgpio_pdev_remove(struct platform_device *pdev)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700510{
Jamie Iles4ddb8ae2011-05-20 00:40:14 -0600511 struct bgpio_chip *bgc = platform_get_drvdata(pdev);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700512
Jamie Iles280df6b2011-05-20 00:40:19 -0600513 return bgpio_remove(bgc);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700514}
515
516static const struct platform_device_id bgpio_id_table[] = {
517 { "basic-mmio-gpio", },
518 { "basic-mmio-gpio-be", },
519 {},
520};
521MODULE_DEVICE_TABLE(platform, bgpio_id_table);
522
523static struct platform_driver bgpio_driver = {
524 .driver = {
525 .name = "basic-mmio-gpio",
526 },
527 .id_table = bgpio_id_table,
Jamie Iles280df6b2011-05-20 00:40:19 -0600528 .probe = bgpio_pdev_probe,
529 .remove = __devexit_p(bgpio_pdev_remove),
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700530};
531
Jamie Iles280df6b2011-05-20 00:40:19 -0600532static int __init bgpio_platform_init(void)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700533{
534 return platform_driver_register(&bgpio_driver);
535}
Jamie Iles280df6b2011-05-20 00:40:19 -0600536module_init(bgpio_platform_init);
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700537
Jamie Iles280df6b2011-05-20 00:40:19 -0600538static void __exit bgpio_platform_exit(void)
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700539{
540 platform_driver_unregister(&bgpio_driver);
541}
Jamie Iles280df6b2011-05-20 00:40:19 -0600542module_exit(bgpio_platform_exit);
543
544#endif /* CONFIG_GPIO_BASIC_MMIO */
Anton Vorontsovaeec56e2010-10-27 15:33:15 -0700545
546MODULE_DESCRIPTION("Driver for basic memory-mapped GPIO controllers");
547MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>");
548MODULE_LICENSE("GPL");