kernel-ark/drivers/gpio/adp5520-gpio.c
Michael Hennerich 7c29a47668 gpio: adp5520: rename common defines and typos
The common adp5520 mfd defines were namespaced to avoid collisions, so
update the define used in this driver accordingly.  The structs were also
renamed to fix a spelling typo.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-12-13 19:20:51 +01:00

211 lines
4.6 KiB
C

/*
* GPIO driver for Analog Devices ADP5520 MFD PMICs
*
* 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/platform_device.h>
#include <linux/mfd/adp5520.h>
#include <linux/gpio.h>
struct adp5520_gpio {
struct device *master;
struct gpio_chip gpio_chip;
unsigned char lut[ADP5520_MAXGPIOS];
unsigned long output;
};
static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
{
struct adp5520_gpio *dev;
uint8_t reg_val;
dev = container_of(chip, struct adp5520_gpio, gpio_chip);
/*
* There are dedicated registers for GPIO IN/OUT.
* Make sure we return the right value, even when configured as output
*/
if (test_bit(off, &dev->output))
adp5520_read(dev->master, ADP5520_GPIO_OUT, &reg_val);
else
adp5520_read(dev->master, ADP5520_GPIO_IN, &reg_val);
return !!(reg_val & dev->lut[off]);
}
static void adp5520_gpio_set_value(struct gpio_chip *chip,
unsigned off, int val)
{
struct adp5520_gpio *dev;
dev = container_of(chip, struct adp5520_gpio, gpio_chip);
if (val)
adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
else
adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
}
static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
{
struct adp5520_gpio *dev;
dev = container_of(chip, struct adp5520_gpio, gpio_chip);
clear_bit(off, &dev->output);
return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
dev->lut[off]);
}
static int adp5520_gpio_direction_output(struct gpio_chip *chip,
unsigned off, int val)
{
struct adp5520_gpio *dev;
int ret = 0;
dev = container_of(chip, struct adp5520_gpio, gpio_chip);
set_bit(off, &dev->output);
if (val)
ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
dev->lut[off]);
else
ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
dev->lut[off]);
ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
dev->lut[off]);
return ret;
}
static int __devinit adp5520_gpio_probe(struct platform_device *pdev)
{
struct adp5520_gpio_platform_data *pdata = pdev->dev.platform_data;
struct adp5520_gpio *dev;
struct gpio_chip *gc;
int ret, i, gpios;
unsigned char ctl_mask = 0;
if (pdata == NULL) {
dev_err(&pdev->dev, "missing platform data\n");
return -ENODEV;
}
if (pdev->id != ID_ADP5520) {
dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
return -ENODEV;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
dev_err(&pdev->dev, "failed to alloc memory\n");
return -ENOMEM;
}
dev->master = pdev->dev.parent;
for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
if (pdata->gpio_en_mask & (1 << i))
dev->lut[gpios++] = 1 << i;
if (gpios < 1) {
ret = -EINVAL;
goto err;
}
gc = &dev->gpio_chip;
gc->direction_input = adp5520_gpio_direction_input;
gc->direction_output = adp5520_gpio_direction_output;
gc->get = adp5520_gpio_get_value;
gc->set = adp5520_gpio_set_value;
gc->can_sleep = 1;
gc->base = pdata->gpio_start;
gc->ngpio = gpios;
gc->label = pdev->name;
gc->owner = THIS_MODULE;
ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
pdata->gpio_en_mask);
if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
ctl_mask |= ADP5520_C3_MODE;
if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
ctl_mask |= ADP5520_R3_MODE;
if (ctl_mask)
ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
ctl_mask);
ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
pdata->gpio_pullup_mask);
if (ret) {
dev_err(&pdev->dev, "failed to write\n");
goto err;
}
ret = gpiochip_add(&dev->gpio_chip);
if (ret)
goto err;
platform_set_drvdata(pdev, dev);
return 0;
err:
kfree(dev);
return ret;
}
static int __devexit adp5520_gpio_remove(struct platform_device *pdev)
{
struct adp5520_gpio *dev;
int ret;
dev = platform_get_drvdata(pdev);
ret = gpiochip_remove(&dev->gpio_chip);
if (ret) {
dev_err(&pdev->dev, "%s failed, %d\n",
"gpiochip_remove()", ret);
return ret;
}
kfree(dev);
return 0;
}
static struct platform_driver adp5520_gpio_driver = {
.driver = {
.name = "adp5520-gpio",
.owner = THIS_MODULE,
},
.probe = adp5520_gpio_probe,
.remove = __devexit_p(adp5520_gpio_remove),
};
static int __init adp5520_gpio_init(void)
{
return platform_driver_register(&adp5520_gpio_driver);
}
module_init(adp5520_gpio_init);
static void __exit adp5520_gpio_exit(void)
{
platform_driver_unregister(&adp5520_gpio_driver);
}
module_exit(adp5520_gpio_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("GPIO ADP5520 Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:adp5520-gpio");