int main() {
int index = gpio_name_to_index("p2.10");
printf("p2.10 = %d\n", index);
printf("%d = %s\n", index, gpio_index_to_name(index));
printf("foo = %d\n", gpio_name_to_index("foo"));
printf("%d = %s\n", ARRAY_SIZE(gpio_names), gpio_index_to_name(ARRAY_SIZE(gpio_names)));
return 0;
}
static int hall_ak8789_device_init(struct platform_device *pdev,
struct hall_dev *phall_dev)
{
int err = 0;
int i = 0;
int gpio_id = 0;
int gpio_value = 0;
int hall_type_err = 0;
char gpio_name[MAX_GPIO_NAME_LEN];
struct device_node *hall_ak8789_node = NULL;
struct device *dev = NULL;
struct hall_ak8789_dev *hall_ak8789 = NULL;
if(NULL == phall_dev || NULL == pdev) {
hwlog_err("[ak8789][%s] invalid pointer!\n", __func__);
return -EINVAL;
}
hall_ak8789 = kzalloc(sizeof(struct hall_ak8789_dev), GFP_KERNEL);
if(!hall_ak8789) {
hwlog_err("[hall][%s]hall_dev kmalloc error!\n", __func__);
err = -ENOMEM;
return err;
}
dev = &pdev->dev;
hall_ak8789_node = dev->of_node;
hall_ak8789->hall_ak8789_type = phall_dev->hall_type;
for (i = 0; i < AK8789_GPIO_NUM; i++) {
hall_ak8789->gpio_poles[i] = 0;
}
switch (hall_ak8789->hall_ak8789_type) {
case single_north_pole:
hall_ak8789->gpio_poles[0] = of_get_named_gpio(hall_ak8789_node
, NORTH_POLE_NAME, 0);;
break;
case single_south_pole:
hall_ak8789->gpio_poles[1] = of_get_named_gpio(hall_ak8789_node
, SOUTH_POLE_NAME, 0);
break;
case double_poles:
hall_ak8789->gpio_poles[0] = of_get_named_gpio(hall_ak8789_node
, NORTH_POLE_NAME, 0);
hall_ak8789->gpio_poles[1] = of_get_named_gpio(hall_ak8789_node
, SOUTH_POLE_NAME, 0);
break;
default:
hwlog_err("[hall][%s]Invalid hall type !\n", __func__);
kfree(hall_ak8789);
hall_type_err = -1;
return hall_type_err;
}
for (i = 0; i < AK8789_GPIO_NUM; i++) {
gpio_id = hall_ak8789->gpio_poles[i];
if(gpio_id) {
gpio_index_to_name(i, gpio_name);
err = setup_gpio(gpio_id, gpio_name);
if(err) {
hwlog_err("[hall][%s] gpio %d direction input err %d\n",
__func__, gpio_id, err);
}
gpio_value = gpio_get_value(gpio_id);
phall_dev->irq_info[i].irq = gpio_to_irq(gpio_id);
phall_dev->irq_info[i].trigger_value = (gpio_value == GPIO_LOW_VOLTAGE)
? IRQF_TRIGGER_HIGH : IRQF_TRIGGER_LOW;
strcpy(phall_dev->irq_info[i].name, gpio_name);
} else {
phall_dev->irq_info[i].irq = 0;
phall_dev->irq_info[i].trigger_value = 0;
}
}
phall_dev->hall_device = hall_ak8789;
return err;
}