MT6735平台GPIO中断调试记录
dws文件配置：kernel-3.10/tools/dct/drvgen.exe
bootable/bootloader/lk/target/mt6735_66t_a19/dct/dct/codegen.dws
bootable/bootloader/preloader/custom/mt6735_66t_a19/dct/dct/codegen.dws
kernel-3.10/drivers/misc/mediatek/mach/mt6735/mt6735_66t_a19/dct/dct/codegen.dws
vendor/mediatek/proprietary/custom/mt6735_66t_a19/kernel/dct/dct/codegen.dws
MTK中断IC驱动：kernel-3.10/drivers/irqchip/irq-mt-eic.c
函数：mt_eint_irq_set_type 即设置中断到寄存器。
struct irq_chip mt_irq_eint = {
.name = "mt-eint",
.irq_mask = mt_eint_irq_mask,
.irq_unmask = mt_eint_irq_unmask,
.irq_ack = mt_eint_irq_ack,
.irq_set_type = mt_eint_irq_set_type,
};
linux 驱动设置接口：kernel-3.10/kernel/irq/manage.c
主要流程：request_irq --> request_threaded_irq --> __irq_set_trigger
MTK平台似乎不支持同时上升沿及下降沿触发。
switch_data->irq = gpio_to_irq(switch_data->gpio);
if (switch_data->irq < 0) {
ret = switch_data->irq;
goto err_detect_irq_num_failed;
}
flags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | 0;
irq_set_irq_type(switch_data->irq, IRQ_TYPE_EDGE_BOTH);
DBLOG("request_irq: irq=%d, flag=%lu\n", switch_data->irq, flags);
ret = request_irq(switch_data->irq, gpio_irq_handler, flags, pdata->name, switch_data);
if (ret < 0) {
DBLOG("%s: request_irq fail ret=%d\n", __func__, ret);
goto err_request_irq;
}
enable_irq_wake(switch_data->irq);
/* Perform initial detection */
// gpio_switch_work(&switch_data->work);
移除驱动时注意input devices 设备 input_unregister_device后再/input_free_device会有问题。
static int dbatt_switch_remove(struct platform_device *pdev) {
struct gpio_switch_data *switch_data = platform_get_drvdata(pdev);
DBLOG("%s: entry\n", __func__);
disable_irq_wake(switch_data->irq);
free_irq(switch_data->irq, switch_data);
gpio_free(switch_data->gpio);
gpio_free(DBATT_MBATID_DET_PIN);
gpio_free(DBATT_SWITCH_EN_PIN);
input_unregister_device(switch_data->input_dev);
//input_free_device(switch_data->input_dev);
kfree(switch_data);
#ifdef DBATT_HALL_STATUS_NOTIFY
device_remove_file(&pdev->dev, &hall_dev_attr);
#endif
return 0;
}