linux/drivers/gpio/adp5588-gpio.c
Michael Hennerich 80884094e3 gpio: adp5588-gpio: new driver for ADP5588 GPIO expanders
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-01-11 09:34:07 -08:00

266 lines
5.9 KiB
C

/*
* GPIO Chip driver for Analog Devices
* ADP5588 I/O Expander and QWERTY Keypad Controller
*
* Copyright 2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/i2c/adp5588.h>
#define DRV_NAME "adp5588-gpio"
#define MAXGPIO 18
#define ADP_BANK(offs) ((offs) >> 3)
#define ADP_BIT(offs) (1u << ((offs) & 0x7))
struct adp5588_gpio {
struct i2c_client *client;
struct gpio_chip gpio_chip;
struct mutex lock; /* protect cached dir, dat_out */
unsigned gpio_start;
uint8_t dat_out[3];
uint8_t dir[3];
};
static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
{
int ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev, "Read Error\n");
return ret;
}
static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
{
int ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret < 0)
dev_err(&client->dev, "Write Error\n");
return ret;
}
static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
{
struct adp5588_gpio *dev =
container_of(chip, struct adp5588_gpio, gpio_chip);
return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + ADP_BANK(off))
& ADP_BIT(off));
}
static void adp5588_gpio_set_value(struct gpio_chip *chip,
unsigned off, int val)
{
unsigned bank, bit;
struct adp5588_gpio *dev =
container_of(chip, struct adp5588_gpio, gpio_chip);
bank = ADP_BANK(off);
bit = ADP_BIT(off);
mutex_lock(&dev->lock);
if (val)
dev->dat_out[bank] |= bit;
else
dev->dat_out[bank] &= ~bit;
adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
dev->dat_out[bank]);
mutex_unlock(&dev->lock);
}
static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
{
int ret;
unsigned bank;
struct adp5588_gpio *dev =
container_of(chip, struct adp5588_gpio, gpio_chip);
bank = ADP_BANK(off);
mutex_lock(&dev->lock);
dev->dir[bank] &= ~ADP_BIT(off);
ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
mutex_unlock(&dev->lock);
return ret;
}
static int adp5588_gpio_direction_output(struct gpio_chip *chip,
unsigned off, int val)
{
int ret;
unsigned bank, bit;
struct adp5588_gpio *dev =
container_of(chip, struct adp5588_gpio, gpio_chip);
bank = ADP_BANK(off);
bit = ADP_BIT(off);
mutex_lock(&dev->lock);
dev->dir[bank] |= bit;
if (val)
dev->dat_out[bank] |= bit;
else
dev->dat_out[bank] &= ~bit;
ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
dev->dat_out[bank]);
ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
dev->dir[bank]);
mutex_unlock(&dev->lock);
return ret;
}
static int __devinit adp5588_gpio_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
struct adp5588_gpio *dev;
struct gpio_chip *gc;
int ret, i, revid;
if (pdata == NULL) {
dev_err(&client->dev, "missing platform data\n");
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
return -EIO;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
dev_err(&client->dev, "failed to alloc memory\n");
return -ENOMEM;
}
dev->client = client;
gc = &dev->gpio_chip;
gc->direction_input = adp5588_gpio_direction_input;
gc->direction_output = adp5588_gpio_direction_output;
gc->get = adp5588_gpio_get_value;
gc->set = adp5588_gpio_set_value;
gc->can_sleep = 1;
gc->base = pdata->gpio_start;
gc->ngpio = MAXGPIO;
gc->label = client->name;
gc->owner = THIS_MODULE;
mutex_init(&dev->lock);
ret = adp5588_gpio_read(dev->client, DEV_ID);
if (ret < 0)
goto err;
revid = ret & ADP5588_DEVICE_ID_MASK;
for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) {
dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
(pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
if (ret)
goto err;
}
ret = gpiochip_add(&dev->gpio_chip);
if (ret)
goto err;
dev_info(&client->dev, "gpios %d..%d on a %s Rev. %d\n",
gc->base, gc->base + gc->ngpio - 1,
client->name, revid);
if (pdata->setup) {
ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
}
i2c_set_clientdata(client, dev);
return 0;
err:
kfree(dev);
return ret;
}
static int __devexit adp5588_gpio_remove(struct i2c_client *client)
{
struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
struct adp5588_gpio *dev = i2c_get_clientdata(client);
int ret;
if (pdata->teardown) {
ret = pdata->teardown(client,
dev->gpio_chip.base, dev->gpio_chip.ngpio,
pdata->context);
if (ret < 0) {
dev_err(&client->dev, "teardown failed %d\n", ret);
return ret;
}
}
ret = gpiochip_remove(&dev->gpio_chip);
if (ret) {
dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
return ret;
}
kfree(dev);
return 0;
}
static const struct i2c_device_id adp5588_gpio_id[] = {
{DRV_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
static struct i2c_driver adp5588_gpio_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = adp5588_gpio_probe,
.remove = __devexit_p(adp5588_gpio_remove),
.id_table = adp5588_gpio_id,
};
static int __init adp5588_gpio_init(void)
{
return i2c_add_driver(&adp5588_gpio_driver);
}
module_init(adp5588_gpio_init);
static void __exit adp5588_gpio_exit(void)
{
i2c_del_driver(&adp5588_gpio_driver);
}
module_exit(adp5588_gpio_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("GPIO ADP5588 Driver");
MODULE_LICENSE("GPL");