android2.3 旋转按钮驱动

你的名字 2022-09-17 09:28 202阅读 0赞

旋转按钮如图所示:

![SouthEast][]

实现功能为上，下和确定

驱动源码如下:

/*
    * Driver for keys on GPIO lines capable of generating interrupts.
    * 
    * Copyright 2013 Gzsd Tech
    *
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU General Public License version 2 as
    * published by the Free Software Foundation.
    */
    #include <linux/init.h>
    #include <linux/interrupt.h>
    #include <linux/irq.h>
    #include <linux/ioport.h>
    #include <linux/delay.h>
    #include <linux/serial_core.h>
    #include <linux/io.h>
    #include <linux/platform_device.h>
    #include <plat/map-base.h>
    #include <plat/gpio-cfg.h>
    #include <mach/regs-gpio.h>
    #include <mach/regs-irq.h>
    #include <linux/gpio.h>
    #include <linux/slab.h>
    #include <linux/input.h>
    #include <linux/gzsd_pulley.h>
    
    #define        LKEY                                S5PV210_GPH0(4)
    #define RKEY                                S5PV210_GPH0(3)
    #define MKEY                                S5PV210_GPH0(2)
    
    #define        POWER                                IRQ_EINT(1)
    #define PWIRQSTA                        S5PV210_GPH0(1)
    
    #define MAX_BUTTON_CNT                 (4)
    static int s3c_Keycode[MAX_BUTTON_CNT] = {KEY_UP, KEY_DOWN, KEY_ENTER, KEY_POWER};
    
    static struct input_dev *input;
    static int flag_ll = 0;
    static int flag_lr = 0;
    static int flag_rl = 0;
    static int flag_rr = 0;
    
    static irqreturn_t pulley_lkey(int irq, void *dev_id)
    {
            disable_irq_nosync(irq);
            flag_ll = gpio_get_value(LKEY);
            flag_lr = gpio_get_value(RKEY);
    #if        0
            printk("left flag_ll is %d flag_lr is %d\n",flag_ll,flag_lr);
            input_report_key(input, s3c_Keycode[1], 0);
            if((flag_ll == flag_lr) && (flag_rl != flag_rr)) {
                    input_report_key(input, s3c_Keycode[0], 1);
                    printk("left around\n");
            }
    #else
            if((flag_ll == flag_lr) && (flag_rl != flag_rr)) {
                    input_report_key(input, s3c_Keycode[0], 1);
                    mdelay(50);
                    input_report_key(input, s3c_Keycode[0], 0);
                    //printk("left around\n");
            }
    #endif
            //mdelay(50);
            enable_irq(irq);        
            return IRQ_HANDLED;
    }
    
    static irqreturn_t pulley_rkey(int irq, void *dev_id)
    {
            disable_irq_nosync(irq);
            flag_rr = gpio_get_value(RKEY);
            flag_rl = gpio_get_value(LKEY);
            //printk("right flag_rl is %d flag_rr is %d\n",flag_rl,flag_rr);
    #if        0
            input_report_key(input, s3c_Keycode[0], 0);
            if((flag_rl == flag_rr) && (flag_ll != flag_lr)) {
                    input_report_key(input, s3c_Keycode[1], 1);
                    printk("right around\n");
            }
    #else
            if((flag_rl == flag_rr) && (flag_ll != flag_lr)) {
                    input_report_key(input, s3c_Keycode[1], 1);
                    mdelay(50);
                    input_report_key(input, s3c_Keycode[1], 0);
                    //printk("right around\n");
            }
    #endif
            //mdelay(50);
            enable_irq(irq);        
            return IRQ_HANDLED;
    }
    
    static irqreturn_t pulley_mkey(int irq, void *dev_id)
    {
            int ret;
            disable_irq_nosync(irq);
            ret = gpio_get_value(MKEY);
            if(ret) {
                    input_report_key(input, s3c_Keycode[2], 0);
            }
            else {
                    input_report_key(input, s3c_Keycode[2], 1);
            }
            enable_irq(irq);        
            return IRQ_HANDLED;
    }
    
    static irqreturn_t syspow_isr(int irq, void *dev_id)
    {
            int ret;
            disable_irq_nosync(irq);
            ret = gpio_get_value(PWIRQSTA);
            //printk("%s : line is %d\n",__func__,__LINE__);
            if(ret)
                    input_report_key(input, s3c_Keycode[3], 0);
            else
                    input_report_key(input, s3c_Keycode[3], 1);
    
            mdelay(100);
            enable_irq(irq);        
            return IRQ_HANDLED;
    }
    
    static int __devinit gzsd_pulley_probe(struct platform_device *pdev)
    {
            struct gzsd_pulley_platform_data *pdata = pdev->dev.platform_data;
            struct device *dev = &pdev->dev;
            int err,i;
    
            input = input_allocate_device();
            if (!input) {
                    dev_err(dev, "failed to allocate state\n");
                    input_free_device(input);
                    return -1;
            }
    
            set_bit(EV_KEY, input->evbit);
    
            for(i = 0; i < MAX_BUTTON_CNT; i++)
                    set_bit(s3c_Keycode[i], input->keybit);
    
            input->name = "gzsd-pulley";
            input->phys = "gzsd-pulley/input0";
    
            input->id.bustype = BUS_HOST;
            input->id.vendor = 0x0001;
            input->id.product = 0x0001;
            input->id.version = 0x0100;
    
            input->keycode = s3c_Keycode;
            
            err = input_register_device(input);
            if (err) {
                    dev_err(dev, "Unable to register input device, error: %d\n",
                            err);
                    input_free_device(input);
            }
    
            if (request_irq(pdata->lkey, pulley_lkey, IRQ_TYPE_EDGE_BOTH,"gzsd-pulley", pdata)) {
                    dev_err(dev, "Unable to request pulley lkey.\n");
                    input_unregister_device(input);
                    input = NULL;
            }
    
            if (request_irq(pdata->rkey, pulley_rkey, IRQ_TYPE_EDGE_BOTH,"gzsd-pulley", pdata)) {
                    dev_err(dev, "Unable to request pulley rkey.\n");
                    input_unregister_device(input);
                    input = NULL;
            }
    
            if (request_irq(pdata->mkey, pulley_mkey, IRQ_TYPE_EDGE_BOTH,"gzsd-pulley", pdata)) {
                    dev_err(dev, "Unable to request pulley mkey.\n");
                    input_unregister_device(input);
                    input = NULL;
            }
    
            if (request_irq(pdata->power, syspow_isr, IRQ_TYPE_EDGE_BOTH,"gzsd-pulley", pdata)) {
                    dev_err(dev, "Unable to request power key.\n");
                    input_unregister_device(input);
                    input = NULL;
            }
    
            return 0;
    }
    
    static int __devexit gzsd_pulley_remove(struct platform_device *pdev)
    {
            struct gzsd_pulley_platform_data *pdata = pdev->dev.platform_data;
            free_irq(pdata->lkey, pdata);
            free_irq(pdata->rkey, pdata);
            free_irq(pdata->mkey, pdata);
            free_irq(pdata->power, pdata);
            input_unregister_device(input);
            return 0;
    }
    
    static struct platform_driver gzsd_pulley_device_driver = {
            .probe                = gzsd_pulley_probe,
            .remove                = __devexit_p(gzsd_pulley_remove),
            .driver                = {
                    .name        = "gzsd-pulley",
                    .owner        = THIS_MODULE,
            }
    };
    
    static int __init gzsd_pulley_init(void)
    {
            return platform_driver_register(&gzsd_pulley_device_driver);
    }
    
    static void __exit gzsd_pulley_exit(void)
    {
            platform_driver_unregister(&gzsd_pulley_device_driver);
    }
    
    module_init(gzsd_pulley_init);
    module_exit(gzsd_pulley_exit);
    
    MODULE_AUTHOR("gzsdit@gmail.com ");
    MODULE_DESCRIPTION("gzsd pulley key driver");
    MODULE_LICENSE("GPL");

路径为：drivers/input/keyboard/gzsd\_pulley.c  
内核版本:2.6.35.7

源码下载地址:[点击打开链接][Link 1]

[SouthEast]: /images/20220828/80e04046a9cd404b8123e09d6860ce11.png
[Link 1]: http://download.csdn.net/detail/hclydao/6414497