blob: 82735822bc9d633ae8e54dc2df3e3b5e3ebd5b73 [file] [log] [blame]
David Brownell15fae372008-02-04 22:28:24 -08001/*
Grant Likelyc103de22011-06-04 18:38:28 -06002 * Driver for pcf857x, pca857x, and pca967x I2C GPIO expanders
David Brownell15fae372008-02-04 22:28:24 -08003 *
4 * Copyright (C) 2007 David Brownell
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
H Hartley Sweetend120c172009-09-22 16:46:37 -070021#include <linux/gpio.h>
David Brownell15fae372008-02-04 22:28:24 -080022#include <linux/i2c.h>
23#include <linux/i2c/pcf857x.h>
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -070024#include <linux/interrupt.h>
25#include <linux/irq.h>
26#include <linux/irqdomain.h>
Laurent Pinchartc990d6c2013-08-20 01:04:52 +020027#include <linux/kernel.h>
Paul Gortmakerbb207ef2011-07-03 13:38:09 -040028#include <linux/module.h>
Laurent Pinchart63f57cd2013-09-21 20:39:49 +020029#include <linux/of.h>
30#include <linux/of_device.h>
Laurent Pinchartc990d6c2013-08-20 01:04:52 +020031#include <linux/slab.h>
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -070032#include <linux/spinlock.h>
David Brownell15fae372008-02-04 22:28:24 -080033
David Brownell15fae372008-02-04 22:28:24 -080034
Jean Delvare3760f732008-04-29 23:11:40 +020035static const struct i2c_device_id pcf857x_id[] = {
36 { "pcf8574", 8 },
Wolfram Sang4ba2ccb2009-09-18 22:45:47 +020037 { "pcf8574a", 8 },
Jean Delvare3760f732008-04-29 23:11:40 +020038 { "pca8574", 8 },
39 { "pca9670", 8 },
40 { "pca9672", 8 },
41 { "pca9674", 8 },
42 { "pcf8575", 16 },
43 { "pca8575", 16 },
44 { "pca9671", 16 },
45 { "pca9673", 16 },
46 { "pca9675", 16 },
David Brownell1673ad52008-07-21 14:21:34 -070047 { "max7328", 8 },
48 { "max7329", 8 },
Nikolay Balandin02130492013-03-06 15:06:44 +040049 { "tca9554", 8 },
Jean Delvare3760f732008-04-29 23:11:40 +020050 { }
51};
52MODULE_DEVICE_TABLE(i2c, pcf857x_id);
53
Laurent Pinchart63f57cd2013-09-21 20:39:49 +020054#ifdef CONFIG_OF
55static const struct of_device_id pcf857x_of_table[] = {
56 { .compatible = "nxp,pcf8574" },
57 { .compatible = "nxp,pcf8574a" },
58 { .compatible = "nxp,pca8574" },
59 { .compatible = "nxp,pca9670" },
60 { .compatible = "nxp,pca9672" },
61 { .compatible = "nxp,pca9674" },
62 { .compatible = "nxp,pcf8575" },
63 { .compatible = "nxp,pca8575" },
64 { .compatible = "nxp,pca9671" },
65 { .compatible = "nxp,pca9673" },
66 { .compatible = "nxp,pca9675" },
67 { .compatible = "maxim,max7328" },
68 { .compatible = "maxim,max7329" },
69 { .compatible = "ti,tca9554" },
70 { }
71};
72MODULE_DEVICE_TABLE(of, pcf857x_of_table);
73#endif
74
David Brownell15fae372008-02-04 22:28:24 -080075/*
76 * The pcf857x, pca857x, and pca967x chips only expose one read and one
77 * write register. Writing a "one" bit (to match the reset state) lets
78 * that pin be used as an input; it's not an open-drain model, but acts
79 * a bit like one. This is described as "quasi-bidirectional"; read the
80 * chip documentation for details.
81 *
82 * Many other I2C GPIO expander chips (like the pca953x models) have
83 * more complex register models and more conventional circuitry using
84 * push/pull drivers. They often use the same 0x20..0x27 addresses as
85 * pcf857x parts, making the "legacy" I2C driver model problematic.
86 */
87struct pcf857x {
88 struct gpio_chip chip;
89 struct i2c_client *client;
David Brownell1673ad52008-07-21 14:21:34 -070090 struct mutex lock; /* protect 'out' */
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -070091 struct irq_domain *irq_domain; /* for irq demux */
92 spinlock_t slock; /* protect irq demux */
David Brownell15fae372008-02-04 22:28:24 -080093 unsigned out; /* software latch */
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -070094 unsigned status; /* current status */
George Cherian21fd3cd2013-09-04 12:33:03 +053095 unsigned irq_mapped; /* mapped gpio irqs */
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -070096
97 int (*write)(struct i2c_client *client, unsigned data);
98 int (*read)(struct i2c_client *client);
David Brownell15fae372008-02-04 22:28:24 -080099};
100
101/*-------------------------------------------------------------------------*/
102
103/* Talk to 8-bit I/O expander */
104
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700105static int i2c_write_le8(struct i2c_client *client, unsigned data)
David Brownell15fae372008-02-04 22:28:24 -0800106{
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700107 return i2c_smbus_write_byte(client, data);
David Brownell15fae372008-02-04 22:28:24 -0800108}
109
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700110static int i2c_read_le8(struct i2c_client *client)
David Brownell15fae372008-02-04 22:28:24 -0800111{
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700112 return (int)i2c_smbus_read_byte(client);
David Brownell15fae372008-02-04 22:28:24 -0800113}
114
David Brownell15fae372008-02-04 22:28:24 -0800115/* Talk to 16-bit I/O expander */
116
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700117static int i2c_write_le16(struct i2c_client *client, unsigned word)
David Brownell15fae372008-02-04 22:28:24 -0800118{
119 u8 buf[2] = { word & 0xff, word >> 8, };
120 int status;
121
122 status = i2c_master_send(client, buf, 2);
123 return (status < 0) ? status : 0;
124}
125
126static int i2c_read_le16(struct i2c_client *client)
127{
128 u8 buf[2];
129 int status;
130
131 status = i2c_master_recv(client, buf, 2);
132 if (status < 0)
133 return status;
134 return (buf[1] << 8) | buf[0];
135}
136
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700137/*-------------------------------------------------------------------------*/
138
139static int pcf857x_input(struct gpio_chip *chip, unsigned offset)
David Brownell15fae372008-02-04 22:28:24 -0800140{
141 struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
David Brownell1673ad52008-07-21 14:21:34 -0700142 int status;
David Brownell15fae372008-02-04 22:28:24 -0800143
David Brownell1673ad52008-07-21 14:21:34 -0700144 mutex_lock(&gpio->lock);
David Brownell15fae372008-02-04 22:28:24 -0800145 gpio->out |= (1 << offset);
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700146 status = gpio->write(gpio->client, gpio->out);
David Brownell1673ad52008-07-21 14:21:34 -0700147 mutex_unlock(&gpio->lock);
148
149 return status;
David Brownell15fae372008-02-04 22:28:24 -0800150}
151
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700152static int pcf857x_get(struct gpio_chip *chip, unsigned offset)
David Brownell15fae372008-02-04 22:28:24 -0800153{
154 struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
155 int value;
156
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700157 value = gpio->read(gpio->client);
David Brownell15fae372008-02-04 22:28:24 -0800158 return (value < 0) ? 0 : (value & (1 << offset));
159}
160
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700161static int pcf857x_output(struct gpio_chip *chip, unsigned offset, int value)
David Brownell15fae372008-02-04 22:28:24 -0800162{
163 struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
164 unsigned bit = 1 << offset;
David Brownell1673ad52008-07-21 14:21:34 -0700165 int status;
David Brownell15fae372008-02-04 22:28:24 -0800166
David Brownell1673ad52008-07-21 14:21:34 -0700167 mutex_lock(&gpio->lock);
David Brownell15fae372008-02-04 22:28:24 -0800168 if (value)
169 gpio->out |= bit;
170 else
171 gpio->out &= ~bit;
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700172 status = gpio->write(gpio->client, gpio->out);
David Brownell1673ad52008-07-21 14:21:34 -0700173 mutex_unlock(&gpio->lock);
174
175 return status;
David Brownell15fae372008-02-04 22:28:24 -0800176}
177
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700178static void pcf857x_set(struct gpio_chip *chip, unsigned offset, int value)
David Brownell15fae372008-02-04 22:28:24 -0800179{
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700180 pcf857x_output(chip, offset, value);
David Brownell15fae372008-02-04 22:28:24 -0800181}
182
183/*-------------------------------------------------------------------------*/
184
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700185static int pcf857x_to_irq(struct gpio_chip *chip, unsigned offset)
186{
187 struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
George Cherian21fd3cd2013-09-04 12:33:03 +0530188 int ret;
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700189
George Cherian21fd3cd2013-09-04 12:33:03 +0530190 ret = irq_create_mapping(gpio->irq_domain, offset);
191 if (ret > 0)
192 gpio->irq_mapped |= (1 << offset);
193
194 return ret;
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700195}
196
George Cherian5c21d002013-09-04 12:33:01 +0530197static irqreturn_t pcf857x_irq(int irq, void *data)
198{
199 struct pcf857x *gpio = data;
200 unsigned long change, i, status, flags;
201
202 status = gpio->read(gpio->client);
203
204 spin_lock_irqsave(&gpio->slock, flags);
205
George Cherian21fd3cd2013-09-04 12:33:03 +0530206 /*
207 * call the interrupt handler iff gpio is used as
208 * interrupt source, just to avoid bad irqs
209 */
210
211 change = ((gpio->status ^ status) & gpio->irq_mapped);
George Cherian5c21d002013-09-04 12:33:01 +0530212 for_each_set_bit(i, &change, gpio->chip.ngpio)
213 generic_handle_irq(irq_find_mapping(gpio->irq_domain, i));
214 gpio->status = status;
215
216 spin_unlock_irqrestore(&gpio->slock, flags);
217
218 return IRQ_HANDLED;
219}
220
Linus Walleijc27769e2013-09-18 13:12:29 +0200221static int pcf857x_irq_domain_map(struct irq_domain *domain, unsigned int irq,
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700222 irq_hw_number_t hw)
223{
George Cherian21fd3cd2013-09-04 12:33:03 +0530224 struct pcf857x *gpio = domain->host_data;
225
Linus Walleijc27769e2013-09-18 13:12:29 +0200226 irq_set_chip_and_handler(irq,
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700227 &dummy_irq_chip,
228 handle_level_irq);
Linus Walleijc27769e2013-09-18 13:12:29 +0200229#ifdef CONFIG_ARM
230 set_irq_flags(irq, IRQF_VALID);
231#else
232 irq_set_noprobe(irq);
233#endif
George Cherian21fd3cd2013-09-04 12:33:03 +0530234 gpio->irq_mapped |= (1 << hw);
235
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700236 return 0;
237}
238
239static struct irq_domain_ops pcf857x_irq_domain_ops = {
240 .map = pcf857x_irq_domain_map,
241};
242
243static void pcf857x_irq_domain_cleanup(struct pcf857x *gpio)
244{
245 if (gpio->irq_domain)
246 irq_domain_remove(gpio->irq_domain);
247
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700248}
249
250static int pcf857x_irq_domain_init(struct pcf857x *gpio,
Kuninori Morimoto805f8642012-12-06 01:10:28 -0800251 struct i2c_client *client)
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700252{
253 int status;
254
Kuninori Morimoto805f8642012-12-06 01:10:28 -0800255 gpio->irq_domain = irq_domain_add_linear(client->dev.of_node,
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700256 gpio->chip.ngpio,
257 &pcf857x_irq_domain_ops,
George Cherian21fd3cd2013-09-04 12:33:03 +0530258 gpio);
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700259 if (!gpio->irq_domain)
260 goto fail;
261
262 /* enable real irq */
George Cherian5c21d002013-09-04 12:33:01 +0530263 status = devm_request_threaded_irq(&client->dev, client->irq,
264 NULL, pcf857x_irq, IRQF_ONESHOT |
265 IRQF_TRIGGER_FALLING,
266 dev_name(&client->dev), gpio);
267
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700268 if (status)
269 goto fail;
270
271 /* enable gpio_to_irq() */
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700272 gpio->chip.to_irq = pcf857x_to_irq;
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700273
274 return 0;
275
276fail:
277 pcf857x_irq_domain_cleanup(gpio);
278 return -EINVAL;
279}
280
281/*-------------------------------------------------------------------------*/
282
Jean Delvared2653e92008-04-29 23:11:39 +0200283static int pcf857x_probe(struct i2c_client *client,
284 const struct i2c_device_id *id)
David Brownell15fae372008-02-04 22:28:24 -0800285{
Laurent Pinchart63f57cd2013-09-21 20:39:49 +0200286 struct pcf857x_platform_data *pdata = dev_get_platdata(&client->dev);
287 struct device_node *np = client->dev.of_node;
David Brownell15fae372008-02-04 22:28:24 -0800288 struct pcf857x *gpio;
Laurent Pinchart63f57cd2013-09-21 20:39:49 +0200289 unsigned int n_latch = 0;
David Brownell15fae372008-02-04 22:28:24 -0800290 int status;
291
Laurent Pinchart63f57cd2013-09-21 20:39:49 +0200292 if (IS_ENABLED(CONFIG_OF) && np)
293 of_property_read_u32(np, "lines-initial-states", &n_latch);
294 else if (pdata)
295 n_latch = pdata->n_latch;
296 else
Ben Dooksa342d212009-01-15 13:50:45 -0800297 dev_dbg(&client->dev, "no platform data\n");
David Brownell15fae372008-02-04 22:28:24 -0800298
299 /* Allocate, initialize, and register this gpio_chip. */
Jingoo Hanf39f54a2013-03-15 18:16:11 +0900300 gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
David Brownell15fae372008-02-04 22:28:24 -0800301 if (!gpio)
302 return -ENOMEM;
303
David Brownell1673ad52008-07-21 14:21:34 -0700304 mutex_init(&gpio->lock);
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700305 spin_lock_init(&gpio->slock);
David Brownell1673ad52008-07-21 14:21:34 -0700306
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700307 gpio->chip.base = pdata ? pdata->gpio_base : -1;
Linus Walleij9fb1f392013-12-04 14:42:46 +0100308 gpio->chip.can_sleep = true;
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700309 gpio->chip.dev = &client->dev;
310 gpio->chip.owner = THIS_MODULE;
311 gpio->chip.get = pcf857x_get;
312 gpio->chip.set = pcf857x_set;
313 gpio->chip.direction_input = pcf857x_input;
314 gpio->chip.direction_output = pcf857x_output;
315 gpio->chip.ngpio = id->driver_data;
David Brownell15fae372008-02-04 22:28:24 -0800316
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700317 /* enable gpio_to_irq() if platform has settings */
Laurent Pinchart655c4e72013-08-20 01:04:53 +0200318 if (client->irq) {
319 status = pcf857x_irq_domain_init(gpio, client);
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700320 if (status < 0) {
321 dev_err(&client->dev, "irq_domain init failed\n");
322 goto fail;
323 }
324 }
325
David Brownell15fae372008-02-04 22:28:24 -0800326 /* NOTE: the OnSemi jlc1562b is also largely compatible with
327 * these parts, notably for output. It has a low-resolution
328 * DAC instead of pin change IRQs; and its inputs can be the
329 * result of comparators.
330 */
331
332 /* 8574 addresses are 0x20..0x27; 8574a uses 0x38..0x3f;
333 * 9670, 9672, 9764, and 9764a use quite a variety.
334 *
335 * NOTE: we don't distinguish here between *4 and *4a parts.
336 */
Jean Delvare3760f732008-04-29 23:11:40 +0200337 if (gpio->chip.ngpio == 8) {
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700338 gpio->write = i2c_write_le8;
339 gpio->read = i2c_read_le8;
David Brownell15fae372008-02-04 22:28:24 -0800340
341 if (!i2c_check_functionality(client->adapter,
342 I2C_FUNC_SMBUS_BYTE))
343 status = -EIO;
344
345 /* fail if there's no chip present */
346 else
347 status = i2c_smbus_read_byte(client);
348
349 /* '75/'75c addresses are 0x20..0x27, just like the '74;
350 * the '75c doesn't have a current source pulling high.
351 * 9671, 9673, and 9765 use quite a variety of addresses.
352 *
353 * NOTE: we don't distinguish here between '75 and '75c parts.
354 */
Jean Delvare3760f732008-04-29 23:11:40 +0200355 } else if (gpio->chip.ngpio == 16) {
Kuninori Morimoto0c65ddd2012-06-13 21:58:08 -0700356 gpio->write = i2c_write_le16;
357 gpio->read = i2c_read_le16;
David Brownell15fae372008-02-04 22:28:24 -0800358
359 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
360 status = -EIO;
361
362 /* fail if there's no chip present */
363 else
364 status = i2c_read_le16(client);
365
Ben Dooksa342d212009-01-15 13:50:45 -0800366 } else {
367 dev_dbg(&client->dev, "unsupported number of gpios\n");
368 status = -EINVAL;
369 }
David Brownell15fae372008-02-04 22:28:24 -0800370
371 if (status < 0)
372 goto fail;
373
374 gpio->chip.label = client->name;
375
376 gpio->client = client;
377 i2c_set_clientdata(client, gpio);
378
379 /* NOTE: these chips have strange "quasi-bidirectional" I/O pins.
380 * We can't actually know whether a pin is configured (a) as output
381 * and driving the signal low, or (b) as input and reporting a low
382 * value ... without knowing the last value written since the chip
383 * came out of reset (if any). We can't read the latched output.
384 *
385 * In short, the only reliable solution for setting up pin direction
386 * is to do it explicitly. The setup() method can do that, but it
387 * may cause transient glitching since it can't know the last value
388 * written (some pins may need to be driven low).
389 *
Laurent Pinchart63f57cd2013-09-21 20:39:49 +0200390 * Using n_latch avoids that trouble. When left initialized to zero,
391 * our software copy of the "latch" then matches the chip's all-ones
392 * reset state. Otherwise it flags pins to be driven low.
David Brownell15fae372008-02-04 22:28:24 -0800393 */
Laurent Pinchart63f57cd2013-09-21 20:39:49 +0200394 gpio->out = ~n_latch;
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700395 gpio->status = gpio->out;
David Brownell15fae372008-02-04 22:28:24 -0800396
397 status = gpiochip_add(&gpio->chip);
398 if (status < 0)
399 goto fail;
400
David Brownell15fae372008-02-04 22:28:24 -0800401 /* Let platform code set up the GPIOs and their users.
402 * Now is the first time anyone could use them.
403 */
Dmitry Eremin-Solenikov49946f62010-08-10 18:02:24 -0700404 if (pdata && pdata->setup) {
David Brownell15fae372008-02-04 22:28:24 -0800405 status = pdata->setup(client,
406 gpio->chip.base, gpio->chip.ngpio,
407 pdata->context);
408 if (status < 0)
409 dev_warn(&client->dev, "setup --> %d\n", status);
410 }
411
Kuninori Morimoto805f8642012-12-06 01:10:28 -0800412 dev_info(&client->dev, "probed\n");
413
David Brownell15fae372008-02-04 22:28:24 -0800414 return 0;
415
416fail:
417 dev_dbg(&client->dev, "probe error %d for '%s'\n",
418 status, client->name);
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700419
Laurent Pinchart655c4e72013-08-20 01:04:53 +0200420 if (client->irq)
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700421 pcf857x_irq_domain_cleanup(gpio);
422
David Brownell15fae372008-02-04 22:28:24 -0800423 return status;
424}
425
426static int pcf857x_remove(struct i2c_client *client)
427{
Jingoo Hane56aee12013-07-30 17:08:05 +0900428 struct pcf857x_platform_data *pdata = dev_get_platdata(&client->dev);
David Brownell15fae372008-02-04 22:28:24 -0800429 struct pcf857x *gpio = i2c_get_clientdata(client);
430 int status = 0;
431
Dmitry Eremin-Solenikov49946f62010-08-10 18:02:24 -0700432 if (pdata && pdata->teardown) {
David Brownell15fae372008-02-04 22:28:24 -0800433 status = pdata->teardown(client,
434 gpio->chip.base, gpio->chip.ngpio,
435 pdata->context);
436 if (status < 0) {
437 dev_err(&client->dev, "%s --> %d\n",
438 "teardown", status);
439 return status;
440 }
441 }
442
Laurent Pinchart655c4e72013-08-20 01:04:53 +0200443 if (client->irq)
Kuninori Morimoto6e20a0a2012-06-14 19:40:41 -0700444 pcf857x_irq_domain_cleanup(gpio);
445
David Brownell15fae372008-02-04 22:28:24 -0800446 status = gpiochip_remove(&gpio->chip);
Jingoo Hanf39f54a2013-03-15 18:16:11 +0900447 if (status)
David Brownell15fae372008-02-04 22:28:24 -0800448 dev_err(&client->dev, "%s --> %d\n", "remove", status);
449 return status;
450}
451
452static struct i2c_driver pcf857x_driver = {
453 .driver = {
454 .name = "pcf857x",
455 .owner = THIS_MODULE,
Laurent Pinchart63f57cd2013-09-21 20:39:49 +0200456 .of_match_table = of_match_ptr(pcf857x_of_table),
David Brownell15fae372008-02-04 22:28:24 -0800457 },
458 .probe = pcf857x_probe,
459 .remove = pcf857x_remove,
Jean Delvare3760f732008-04-29 23:11:40 +0200460 .id_table = pcf857x_id,
David Brownell15fae372008-02-04 22:28:24 -0800461};
462
463static int __init pcf857x_init(void)
464{
465 return i2c_add_driver(&pcf857x_driver);
466}
David Brownell2f8d1192008-10-15 22:03:13 -0700467/* register after i2c postcore initcall and before
468 * subsys initcalls that may rely on these GPIOs
469 */
470subsys_initcall(pcf857x_init);
David Brownell15fae372008-02-04 22:28:24 -0800471
472static void __exit pcf857x_exit(void)
473{
474 i2c_del_driver(&pcf857x_driver);
475}
476module_exit(pcf857x_exit);
477
478MODULE_LICENSE("GPL");
479MODULE_AUTHOR("David Brownell");