全志A20 keyadc驱动程序

青旅半醒 2021-07-26 15:25 659阅读 0赞

/* * linux/drivers/char/keyadc.c * * Copyright (C) 2013 Jack Chen, chwenj@gmail.com * * - Base on Allwinner A20 K70 platform; * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */
     
    #include <linux/module.h>
    #include <linux/slab.h>
    #include <linux/cdev.h>
    #include <linux/input.h>
    #include <linux/platform_device.h>
    #include <linux/interrupt.h>
    #include <asm/io.h>
    #include <asm/uaccess.h>
     
    /****************************************************************/
    #define MAGIC '8'
    #define KEYADC_SET _IOW(MAGIC, 0, unsigned long)
    #define KEYADC_GET _IOR(MAGIC, 1, unsigned long)
     
    #define KEYADC_VOLUP (0x11)
    #define KEYADC_VOLDOWN (0x12)
    #define KEYADC_HOME (0x13)
    #define KEYADC_BACK (0x14)
     
    #define KEY_IRQNO (AW_IRQ_LRADC)
     
    #define INPUTNAME "keyadc_input" 
    #define PLATFORMNAME "platform_keyadc"
    #define DEVNAME "keyadc"
    #define WORKQUEUENAME "keyadc_workqueue"
    #define IRQNAME "keyadc_irq"
     
    //#define DEBUGMASK 
    #ifdef DEBUGMASK
    	#define dprintk(fmt, arg...) printk(fmt, ## arg)
    #else
    	#define dprintk(fmt, arg...)
    #endif
     
    /****************************************************************/
    static struct sun7i_lradc_regs { 
    	#define LRADC_BASE_ADDR (0xf1c22800) 
    	#define LRADC_CTRL (0x00)
    	#define LRADC_INTC (0x04)
    	#define LRADC_INTS (0x08)
    	#define LRADC_DATA0 (0x0c)
    	#define LRADC_DATA1 (0x10)
     			
    //regs 
    	/*LRADC_CTRL*/
    	u32 ctrl;
    	/*LRADC_INTC*/
    	u32 intc;
    	/*LRADC_INTS*/
    	u32 ints;
    	/*LRADC_DATA0*/
    	u32 data0;
    	/*LRADC_DATA1*/
    	u32 data1;
    //bits
    	#define FIRST_CONCERT_DLY (2<<24)
    	#define CHAN (0x3)
    	#define ADC_CHAN_SELECT (CHAN<<22)
    	#define LRADC_KEY_MODE (0)
    	#define KEY_MODE_SELECT (LRADC_KEY_MODE<<12)
    	#define LEVELB_VOL (0<<4)
     
    	#define LRADC_HOLD_EN (1<<6)
     
    	#define LRADC_SAMPLE_32HZ (3<<2)
    	#define LRADC_SAMPLE_62HZ (2<<2)
    	#define LRADC_SAMPLE_125HZ (1<<2)
    	#define LRADC_SAMPLE_250HZ (0<<2)
     
    	#define LRADC_EN (1<<0)
     
    	#define LRADC_ADC1_UP_EN (1<<12)
    	#define LRADC_ADC1_DOWN_EN (1<<9)
    	#define LRADC_ADC1_DATA_EN (1<<8)
     
    	#define LRADC_ADC0_UP_EN (1<<4)
    	#define LRADC_ADC0_DOWN_EN (1<<1)
    	#define LRADC_ADC0_DATA_EN (1<<0)
     
    	#define LRADC_ADC1_UPPEND (1<<12)
    	#define LRADC_ADC1_DOWNPEND (1<<9)
    	#define LRADC_ADC1_DATAPEND (1<<8)
     
    	#define LRADC_ADC0_UPPEND (1<<4)
    	#define LRADC_ADC0_DOWNPEND (1<<1)
    	#define LRADC_ADC0_DATAPEND (1<<0)
    } __attribute__((packed));
     
    static struct keyadc_dev{ 
    	dev_t devid;
    	struct cdev chrdev;
    	struct class *class;
    	struct input_dev *input;
     
    	struct workqueue_struct *keyadc_workqueue;
    	struct work_struct keyadc_work;
     
    	unsigned int keycode;
    	volatile struct sun7i_lradc_regs *regs;
    };	
     
    static struct keyadc_dev keyadc_pdata = { 
    	.regs = NULL,
    };
     
    static struct platform_device keyadc_device = { 
    	.name	= PLATFORMNAME,
    	.id	= -1,
    	.dev	= { 
    		.platform_data = &keyadc_pdata,
    	}		
    };
     
    /****************************************************************/
    static int keyadc_open(struct inode *inode, struct file *filp)
    { 
    	struct keyadc_dev *pdata;	
    	
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
     
    	pdata = container_of(inode->i_cdev, struct keyadc_dev, chrdev);
    	filp->private_data = pdata;
     
    	return 0;
    }
     
    static int keyadc_release(struct inode *inode, struct file *filp)
    { 
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
     
    	filp->private_data = NULL;
     
    	return 0;
    }
     
    static long keyadc_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
    { 
    	long ret;
    	void __user *uarg;
    	unsigned long karg;
     
    	struct keyadc_dev *pdata = filp->private_data;
     
    	dprintk("=====[%s(%d)]:cmd=%d\n", __FUNCTION__, __LINE__, cmd);
     
    	if (KEYADC_SET == cmd) { 
    		uarg = (void __user *)arg;
    		copy_from_user(&karg, uarg, sizeof(unsigned long));
    	
    		switch (karg) { 
    		case KEYADC_VOLUP:
    			pdata->keycode = KEY_VOLUMEUP;
    			break;
    		case KEYADC_VOLDOWN:
    			pdata->keycode = KEY_VOLUMEDOWN;
    			break;
    		case KEYADC_HOME:
    			pdata->keycode = KEY_HOME;
    			break;
    		case KEYADC_BACK:
    			pdata->keycode = KEY_BACK;
    			break;
    		default:
    			dprintk("this is defalt\n");
    			break;
    		}
    	}
    	if (KEYADC_GET == cmd){ 
    		karg = pdata->keycode;
    		dprintk("send keycode to usr space: pdata->keycode=0x%x, karg=0x%x\n", pdata->keycode, karg);
    		ret = copy_to_user(arg, &karg, sizeof(unsigned long));
    		if(0 == ret){ 
    			dprintk("copy_to_user successed!\n");
    		}
    	}
     
    	return 0;
    }
     
    static struct file_operations keyadc_fops = { 
    	.owner		= THIS_MODULE,
    	.open		= keyadc_open,
    	.release	= keyadc_release,
    	.unlocked_ioctl	= keyadc_unlocked_ioctl,
    };
     
    static void keyadc_do_work(struct work_struct *work)
    { 
    	struct keyadc_dev *pdata;
     
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
     
    	pdata = (struct keyadc_dev *)container_of(work, struct keyadc_dev, keyadc_work);		
    	
    	if ((KEY_VOLUMEUP == pdata->keycode)	||
    	    (KEY_VOLUMEDOWN == pdata->keycode)	||
    	    (KEY_HOME == pdata->keycode)	||
    	    (KEY_BACK == pdata->keycode)) { 
    		input_report_key(pdata->input, pdata->keycode, 1);
    		input_report_key(pdata->input, pdata->keycode, 0);
    		input_sync(pdata->input);
    	} else { 
    		dprintk("=====[%s(%d)]:%s\n", __FUNCTION__, __LINE__, "No Keycode to Report!");
    	}
    }
     
    static irqreturn_t key_interrupt(int irq, void *pvoid)
    { 
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
     
    	unsigned int reg_val;
    	struct keyadc_dev *pdata	= (struct keyadc_dev *)pvoid;
     
    	reg_val  = readl(&pdata->regs->ints);
    	
    	queue_work(pdata->keyadc_workqueue, &pdata->keyadc_work);
     
    	writel(reg_val, &pdata->regs->ints);
     
    	return IRQ_HANDLED;
    }
     
    static int keyadc_probe(struct platform_device *pdev)
    { 
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
    	
    	int ret;
    	struct cdev *pchrdev;
     
    	struct keyadc_dev *pdata = pdev->dev.platform_data;
    	pdata->regs = (struct sun7i_lradc_regs *)LRADC_BASE_ADDR;
     
    	alloc_chrdev_region(&pdata->devid, 0, 1, DEVNAME);
    	pchrdev = cdev_alloc();
    	pdata->chrdev = *pchrdev;
    	cdev_init(&pdata->chrdev, &keyadc_fops);
    	pdata->chrdev.owner = THIS_MODULE;
    	ret = cdev_add(&pdata->chrdev, pdata->devid, 1);
    	if (ret) { 
    		dprintk("=====[%s(%d)]:%s\n", __FUNCTION__, __LINE__, "fail to cdev_add!");
    		goto fail0;
    	}
     
     	pdata->input = input_allocate_device();	
    	if (!pdata->input) { 
    		dprintk("=====[%s(%d)]:%s\n", __FUNCTION__, __LINE__, "fail to input_allocate_device");
    		goto fail1;
    	}
    	pdata->input->name = INPUTNAME;
    	set_bit(EV_KEY,		pdata->input->evbit);
    	set_bit(KEY_VOLUMEDOWN,	pdata->input->keybit);
    	set_bit(KEY_VOLUMEUP,	pdata->input->keybit);
    	set_bit(KEY_HOME,	pdata->input->keybit);
    	set_bit(KEY_BACK,	pdata->input->keybit);
    	ret = input_register_device(pdata->input);
    	if (ret) { 
    		dprintk("=====[%s(%d)]:%s\n", __FUNCTION__, __LINE__, "fail to input_register_device");
    		goto fail2;
    	}
     
    	pdata->class = class_create(THIS_MODULE, DEVNAME);
    	if (IS_ERR(pdata->class)) { 
    		dprintk("=====[%s(%d)]:%s\n", __FUNCTION__, __LINE__, "fail to class_create");
    		goto fail3;
    	}
    	device_create(pdata->class, NULL, pdata->devid, NULL, DEVNAME);
    	
    	writel(LRADC_ADC0_DOWN_EN|LRADC_ADC0_UP_EN|LRADC_ADC0_DATA_EN, &pdata->regs->intc);
    	writel(FIRST_CONCERT_DLY|LEVELB_VOL|KEY_MODE_SELECT|LRADC_HOLD_EN|ADC_CHAN_SELECT|LRADC_SAMPLE_125HZ|LRADC_EN, &pdata->regs->ctrl);
     
    	if (request_irq(KEY_IRQNO, key_interrupt, 0, IRQNAME, pdata)) { 
    		dprintk("=====[%s(%d)]:%s\n", __FUNCTION__, __LINE__, "fail to request_irq");
    		goto fail3;
    	}
     
    	pdata->keyadc_workqueue = create_singlethread_workqueue(WORKQUEUENAME);	
    	if (NULL == pdata->keyadc_workqueue) { 
    		dprintk("=====[%s(%d)]:%s\n", __FUNCTION__, __LINE__, "fail to create_singlethread_workqueue");
    		goto fail4;
    	}	
    	INIT_WORK(&pdata->keyadc_work, keyadc_do_work);
     
    	return 0;
     
    fail4:
    	destroy_workqueue(pdata->keyadc_workqueue);	
    fail3:
    	free_irq(KEY_IRQNO, pdata);
    	device_destroy(pdata->class, pdata->devid);
    	class_destroy(pdata->class);
    fail2:
    	input_unregister_device(pdata->input);
    fail1:
    	input_free_device(pdata->input);
    fail0:
    	cdev_del(&pdata->chrdev);
    	kfree(pdata);
     
    	return ret;
    }
     
    static int keyadc_remove(struct platform_device *pdev)
    { 
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
     
    	struct keyadc_dev *pdata = pdev->dev.platform_data;
     
    	destroy_workqueue(pdata->keyadc_workqueue);
    	device_destroy(pdata->class, pdata->devid);		
    	class_destroy(pdata->class);
    	input_free_device(pdata->input);
    	cdev_del(&pdata->chrdev);
    	free_irq(KEY_IRQNO, pdata);		
    	//kfree(pdata);
    	return 0;
    }
     
     
    static struct platform_driver keyadc_driver = { 
    	.probe	= keyadc_probe,
    	.remove	= keyadc_remove,
    	.driver	= { 
    		.name	= PLATFORMNAME,
    		.owner	= THIS_MODULE,
    	}
    };
     
    static int __init keyadc_init(void)
    { 
    	int ret;
     
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
    	
    	ret = platform_device_register(&keyadc_device);
    	if (ret < 0) { 
    		dprintk("ERROR:Fail to platform_device_register!\n");
    		return ret;
    	}
     
    	ret = platform_driver_register(&keyadc_driver);	
    	if (ret < 0) { 
    		dprintk("ERROR:Fail to platform_driver_register!\n");
    		return ret;
    	}
     
    	return 0;
    }
     
    static void __exit keyadc_exit(void)
    { 
    	dprintk("=====[%s(%d)]\n", __FUNCTION__, __LINE__);
     
    	platform_device_unregister(&keyadc_device);
    	platform_driver_unregister(&keyadc_driver);
    }
     
    MODULE_AUTHOR("Jack Chen, chwenj@gmail.com");
    MODULE_LICENSE("GPL");
     
    module_init(keyadc_init);
    module_exit(keyadc_exit);