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Input: ad7877 - use attribute group to control visibility of attributes 

Instead of manually creating one set of attributes or another set up
is_visible method in attribute group structure to control whether
aux3 or gpio3 attribute is presented to userspace.

Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2010-10-18 09:22:38 -07:00
parent fc58d12be4
commit 2fd18abad1
1 changed files with 29 additions and 20 deletions
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35
drivers/input/touchscreen/ad7877.c
View File

@ -206,8 +206,8 @@ struct ad7877 {
u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned;
};
static int gpio3;
module_param(gpio3, int, 0);
static bool gpio3;
module_param(gpio3, bool, 0);
MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3");
/*
@ -615,15 +615,34 @@ static struct attribute *ad7877_attributes[] = {
&dev_attr_temp2.attr,
&dev_attr_aux1.attr,
&dev_attr_aux2.attr,
&dev_attr_aux3.attr,
&dev_attr_bat1.attr,
&dev_attr_bat2.attr,
&dev_attr_disable.attr,
&dev_attr_dac.attr,
&dev_attr_gpio3.attr,
&dev_attr_gpio4.attr,
NULL
};
static mode_t ad7877_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
mode_t mode = attr->mode;
if (attr == &dev_attr_aux3.attr) {
if (gpio3)
mode = 0;
} else if (attr == &dev_attr_gpio3.attr) {
if (!gpio3)
mode = 0;
}
return mode;
}
static const struct attribute_group ad7877_attr_group = {
.is_visible = ad7877_attr_is_visible,
.attrs = ad7877_attributes,
};
@ -787,20 +806,12 @@ static int __devinit ad7877_probe(struct spi_device *spi)
if (err)
goto err_free_irq;
err = device_create_file(&spi->dev,
gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
err = input_register_device(input_dev);
if (err)
goto err_remove_attr_group;
err = input_register_device(input_dev);
if (err)
goto err_remove_attr;
return 0;
err_remove_attr:
device_remove_file(&spi->dev,
gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
err_remove_attr_group:
sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
err_free_irq:
@ -817,8 +828,6 @@ static int __devexit ad7877_remove(struct spi_device *spi)
struct ad7877 *ts = dev_get_drvdata(&spi->dev);
sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group);
device_remove_file(&spi->dev,
gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3);
ad7877_disable(ts);
free_irq(ts->spi->irq, ts);