[问答]

RK3126人体感应模块驱动分享，错过绝对后悔

899 RK3126

问答对人有帮助，内容完整，我也想知道答案 0 RK3126人体感应模块驱动分享，错过绝对后悔 0
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答案对人有帮助，有参考价值 0 < > 其实人体感应模块驱动比较简单，就是一个GPIO口的检测，这里主要是想提供一个接口，给上层去比较容易的控制，一般我们可以写成JNI封装，我嫌太麻烦了，直接使用共享文件的方式，往/data/data/com.frame.cloud/mode.txt"下面写一个值，代表人体感应打开，另外一个值代表人体感应的关闭，内核和应用分别去监听文件的变化即可，比较简单，以下是驱动参考： #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static struct class body_detect_class = NULL; static struct input_dev sinput_dev; static struct timer_list gpio_timer; static unsigned int time_delay = HZ * 1; extern int lcd_enable ; static unsigned int gpio_state = 0; static int gpio3_d3; static int body_detect_switch = 0; static int irq_gpio3_d3; #define BODY_DETECT_OPEN 300 #define BODY_DETECT_CLOSE 200 #define EYEMODE_FILENAME "/data/data/com.frame.cloud/mode.txt" struct delayed_work read_body_switch_work; static struct of_device_id gpio_of_match[] = { { .compatible = "body_det" }, { } }; MODULE_DEVICE_TABLE(of, gpio_of_match); static int get_body_det_value(void) { struct file fp; mm_segment_t fs; loff_t pos; char buf[5]; int buf_len = 0; fp =filp_open(EYEMODE_FILENAME,O_RDONLY,0); if (IS_ERR(fp)){ printk("open file errorn"); return -1; } fs =get_fs(); set_fs(KERNEL_DS); pos =0; buf_len = vfs_read(fp,buf, sizeof(buf), &pos); buf[buf_len] = ''; filp_close(fp,NULL); set_fs(fs); if(buf_len < 1) { printk("can not get val from EYEMODE_FILENAME n"); return -1; } else { return simple_strtol(buf,NULL,0); } } static int gpio_statu_new = 1; static int gpio_statu_pre = 1; static void gpio_timer_func(unsigned long data) { gpio_state = gpio_get_value(gpio3_d3); gpio_statu_new = gpio_state; if (body_detect_switch == 0) return ;// not deal //printk("gpio_statu_new = %d,gpio_statu_pre = %dn",gpio_statu_new,gpio_statu_pre); if(gpio_state == 0) { if(lcd_enable == 0) { input_event(sinput_dev, EV_KEY, KEY_WAKEUP, 1); input_sync(sinput_dev); input_event(sinput_dev, EV_KEY, KEY_WAKEUP, 0); input_sync(sinput_dev); lcd_enable = 1; } else { input_event(sinput_dev, EV_KEY, KEY_F1, 1); input_event(sinput_dev, EV_KEY, KEY_F1, 0); input_sync(sinput_dev); } } else if (gpio_state == 1) { if(gpio_statu_new != gpio_statu_pre) { gpio_statu_pre = gpio_statu_new; input_event(sinput_dev, EV_KEY, KEY_F2, 1); input_event(sinput_dev, EV_KEY, KEY_F2, 0); input_sync(sinput_dev); } } mod_timer(&gpio_timer, jiffies + time_delay); } static int init_timer_gpio(void) { init_timer(&gpio_timer); gpio_timer.function = gpio_timer_func; mod_timer(&gpio_timer, jiffies + HZ 20 ); return 0; } static ssize_t body_det_switch_show(struct class cls,struct class_attribute attr, char _buf) { printk("%s>>>>>>>> body_detect_switch = %dn",__func__, body_detect_switch); ssize_t len = 0; len += snprintf(_buf + len, PAGE_SIZE - len, "%d rn", body_detect_switch); return 0; } static ssize_t body_det_switch_store(struct class cls,struct class_attribute attr, const char buf, size_t _count) { body_detect_switch = simple_strtol(buf,NULL,10); if( body_detect_switch == 1 \|\| body_detect_switch == 0 ) { printk(KERN_INFO "body_detect_switch is %dn",body_detect_switch); } else { body_detect_switch = -1; printk(KERN_INFO "body_detect_switch is not supportn"); } return _count; } static CLASS_ATTR(body_det_switch, 0666, body_det_switch_show, body_det_switch_store); static int body_det_sys_creat(void) { int ret ; body_detect_class = class_create(THIS_MODULE, "body_det"); ret = class_create_file(body_detect_class, &class_attr_body_det_switch); if (ret < 0) { class_destroy(body_detect_class); body_detect_class = NULL; printk("Fail to creat class body_detect_class.n"); return -1; } return 0; } static int read_switch_function() { int body_det_value = -1; body_det_value = get_body_det_value(); if(body_det_value == BODY_DETECT_OPEN) { body_detect_switch = 1; }else if (body_det_value == BODY_DETECT_CLOSE) { body_detect_switch = 0; } } static void read_body_switch_work_func( struct work_struct work ) { read_switch_function(); schedule_delayed_work(&read_body_switch_work, 10); } static int body_det_probe(struct platform_device pdev) { struct device dev = &pdev->dev; struct device_node node = pdev->dev.of_node; enum of_gpio_flags flags; int ret; int error; struct proc_dir_entry ent; struct input_dev input = NULL; printk("func: %sn", __func__); if (!node) return -ENODEV; input = devm_input_allocate_device(dev); if (!input) { error = -ENOMEM; return error; } input->name = "body_detect"; /* pdev->name; / input->phys = "gpio-keys/input111"; input->dev.parent = dev; input->id.bustype = BUS_HOST; input->id.vendor = 0x0001; input->id.product = 0x0001; input->id.version = 0x0100; error = input_register_device(input); if (error) { input_free_device(input); pr_err("gpio-keys: Unable to register input device, error: %dn",error); return -EINVAL; } sinput_dev = input; input_set_capability(input, EV_KEY, KEY_F1); input_set_capability(input, EV_KEY, KEY_F2); input_set_capability(input, EV_KEY, KEY_WAKEUP); gpio3_d3 = of_get_named_gpio_flags(node, "body_det", 0, &flags); if(!gpio_is_valid(gpio3_d3)){ dev_err(&pdev->dev, "invalid body_det gpio%dn", gpio3_d3); return -EINVAL; } ret = devm_gpio_request(&pdev->dev, gpio3_d3, "body_det_gpio"); if (ret) { dev_err(&pdev->dev, "failed to request GPIO%d for body_det_gpion", gpio3_d3); return -EINVAL; } gpio_direction_input(gpio3_d3); init_timer_gpio(); ret = body_det_sys_creat(); if(ret < 0) { printk("body_det_sys_creat failed n"); return -EINVAL; } INIT_DELAYED_WORK(&read_body_switch_work, read_body_switch_work_func); schedule_delayed_work(&read_body_switch_work, 10); return 0; } static int body_det_remove(struct platform_device pdev) { return 0; } #ifdef CONFIG_PM_SLEEP static int body_det_suspend(struct device dev) { return 0; } static int body_det_resume(struct device dev) { return 0; } #endif static const struct dev_pm_ops body_det_ops = { #ifdef CONFIG_PM_SLEEP .suspend = body_det_suspend, .resume = body_det_resume, .poweroff = body_det_suspend, .restore = body_det_resume, #endif }; static struct platform_driver gpio_driver = { .driver = { .name = "body_det", .owner = THIS_MODULE, .pm = &body_det_ops, .of_match_table = of_match_ptr(gpio_of_match), }, .probe = body_det_probe, .remove = body_det_remove, }; module_platform_driver(gpio_driver); MODULE_DESCRIPTION("body_det"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:body_det");

2022-3-4 14:27:59 评论举报欧建杭