将修改好的hall_sensor.c文件放到input路径下
如 drivers/input/hall_sensor.c
第二步Kconfig配置路径在 drivers/input/Kconfig
第三步Makefile配置路径在：drivers/input/Makefile
路径arch/arm/configs/msm8937go_defconfig
第五步设备树配置路径在arch/arm64/boot/dts/qcom/qm215-qrd.dtsi
第六步（如果上图注释中pinctrl需要配置则需要配置） 第七步 检查是否生效adb shell 进入后 getevent 事件可以查看是否有设备生效
第八步 新增加hall_sensor.kl文件新增方法，跳转到查看matrix_keypad.kl的增加
第九步 功能测试翻盖看是否亮灭（注意是否有磁性）
还可以看cat proc/interrupts 中断是否有产生
#include#include #include #include #include #include #include #include #include #include #include #define LID_DEV_NAME "hall_sensor" #define HALL_INPUT "/dev/input/hall_dev" struct hall_data { int gpio; int irq; int active_low; bool wakeup; struct input_dev *hall_dev; struct device *dev; }; static irqreturn_t hall_interrupt_handler(int irq, void *dev) { int value; struct hall_data *data = dev; value = (gpio_get_value_cansleep(data->gpio) ? 1 : 0) ^ data->active_low; if (value) { //input_report_key(data->hall_dev, KEY_SLEEP, 1); //input_sync(data->hall_dev); //input_report_key(data->hall_dev, KEY_SLEEP, 0); //input_sync(data->hall_dev); input_report_key(data->hall_dev, FLIP, 0); input_sync(data->hall_dev); dev_info(&data->hall_dev->dev, "nearn"); } else { //input_report_key(data->hall_dev, KEY_WAKEUP, 1); //input_sync(data->hall_dev); //input_report_key(data->hall_dev, KEY_WAKEUP, 0); //input_sync(data->hall_dev); input_report_key(data->hall_dev, FLIP, 1); input_sync(data->hall_dev); dev_info(&data->hall_dev->dev, "farn"); } //input_report_key(data->hall_dev, KEY_FLIP, 1); //input_sync(data->hall_dev); //input_report_key(data->hall_dev, KEY_FLIP, 0); input_sync(data->hall_dev); return IRQ_HANDLED; } static int hall_input_init(struct platform_device *pdev, struct hall_data *data) { int err = -1; data->hall_dev = devm_input_allocate_device(&pdev->dev); if (!data->hall_dev) { dev_err(&data->hall_dev->dev, "input device allocation failedn"); return -EINVAL; } data->hall_dev->name = LID_DEV_NAME; data->hall_dev->phys = HALL_INPUT; set_bit(EV_KEY, data->hall_dev->evbit); //set_bit(KEY_WAKEUP, data->hall_dev->keybit); //set_bit(KEY_SLEEP, data->hall_dev->keybit); set_bit(FLIP,data->hall_dev->keybit); err = input_register_device(data->hall_dev); if (err < 0) { dev_err(&data->hall_dev->dev, "unable to register input device %sn", LID_DEV_NAME); return err; } return 0; } #ifdef CONFIG_OF static int hall_parse_dt(struct device *dev, struct hall_data *data) { unsigned int tmp; struct device_node *np = dev->of_node; data->gpio = of_get_named_gpio_flags(dev->of_node, "linux,gpio-int", 0, &tmp); if (!gpio_is_valid(data->gpio)) { dev_err(dev, "hall gpio is not validn"); return -EINVAL; } data->active_low = tmp & OF_GPIO_ACTIVE_LOW ? 0 : 1; data->wakeup = of_property_read_bool(np, "linux,wakeup"); return 0; } #else static int hall_parse_dt(struct device *dev, struct hall_data *data) { return -EINVAL; } #endif // Begin: add by hyangde for hall status show on 220516 static ssize_t hall_status_show(struct device *dev, struct device_attribute *attr, char *buf) { struct hall_data *pdata = dev_get_drvdata(dev); int value; value = (gpio_get_value_cansleep(pdata->gpio) ? 1 : 0) ^ pdata->active_low; return snprintf(buf, PAGE_SIZE, "%dn", value); } static DEVICE_ATTR(hall_status, 0664, hall_status_show, NULL); static struct attribute *hall_attrs[] = { &dev_attr_hall_status.attr, NULL, }; static struct attribute_group hall_attr_group = { .attrs = hall_attrs, }; // End: add by hyangde for hall status show on 220516 static int hall_driver_probe(struct platform_device *dev) { struct hall_data *data; int err = 0; int irq_flags; printk("guh hall probe start"); dev_info(&dev->dev, "hall_driver proben"); data = devm_kzalloc(&dev->dev, sizeof(struct hall_data), GFP_KERNEL); if (data == NULL) { err = -ENOMEM; dev_err(&dev->dev, "failed to allocate memory %dn", err); goto exit; } data->dev = &dev->dev; dev_set_drvdata(&dev->dev, data); if (dev->dev.of_node) { err = hall_parse_dt(&dev->dev, data); if (err < 0) { dev_err(&dev->dev, "Failed to parse device treen"); goto exit; } } else if (dev->dev.platform_data != NULL) { memcpy(data, dev->dev.platform_data, sizeof(*data)); } else { dev_err(&dev->dev, "No valid platform data.n"); err = -ENODEV; goto exit; } err = hall_input_init(dev, data); if (err < 0) { dev_err(&dev->dev, "input init failedn"); goto exit; } if (!gpio_is_valid(data->gpio)) { dev_err(&dev->dev, "gpio is not validn"); err = -EINVAL; goto free_gpio; } irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT; err = gpio_request_one(data->gpio, GPIOF_DIR_IN, "hall_sensor_irq"); if (err) { dev_err(&dev->dev, "unable to request gpio %dn", data->gpio); goto exit; } data->irq = gpio_to_irq(data->gpio); err = devm_request_threaded_irq(&dev->dev, data->irq, NULL, hall_interrupt_handler, irq_flags, "hall_sensor", data); if (err < 0) { dev_err(&dev->dev, "request irq failed : %dn", data->irq); goto free_irq; } err = sysfs_create_group(&data->dev->kobj, &hall_attr_group); if (err) { printk(KERN_ERR "%s sysfs_create_group failn", __func__); return err; } device_init_wakeup(&dev->dev, data->wakeup); enable_irq_wake(data->irq); printk("guh hall probe end"); return 0; free_irq: disable_irq_wake(data->irq); device_init_wakeup(&dev->dev, 0); free_gpio: gpio_free(data->gpio); exit: return err; } static int hall_driver_remove(struct platform_device *dev) { struct hall_data *data = dev_get_drvdata(&dev->dev); disable_irq_wake(data->irq); device_init_wakeup(&dev->dev, 0); if (data->gpio) gpio_free(data->gpio); return 0; } static struct platform_device_id hall_id[] = { {LID_DEV_NAME, 0 }, { }, }; #ifdef CONFIG_OF static struct of_device_id hall_match_table[] = { {.compatible = "hall-switch", }, { }, }; #endif static struct platform_driver hall_driver = { .driver = { .name = LID_DEV_NAME, .owner = THIS_MODULE, .of_match_table = of_match_ptr(hall_match_table), }, .probe = hall_driver_probe, .remove = hall_driver_remove, .id_table = hall_id, }; static int __init hall_init(void) { return platform_driver_register(&hall_driver); } static void __exit hall_exit(void) { platform_driver_unregister(&hall_driver); } module_init(hall_init); module_exit(hall_exit); MODULE_DESCRIPTION("Hall sensor driver"); MODULE_LICENSE("GPL v2");
