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;

}