RK3288 感光芯片 cm3217驱动

mark83136

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/adc.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/sysctl.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <asm/gpio.h>
#include <asm/uaccess.h>
#include <linux/timer.h>
#include <linux/input.h>
#include <linux/ioctl.h>
//#include <mach/rk29_sdk_io.h>
#include <mach/board.h>
#include <linux/platform_device.h>
#ifdef CONFIG_HAS_EARLYSUSPEND
#include <linux/earlysuspend.h>
#endif

#define DEBUG     0

#if DEBUG
#define DBG(X...)    printk(KERN_NOTICE X)
#else
#define DBG(X...)
#endif

#define CM3217_I2C_RATE        (200*1000)
#define CM3217_ADDR_COM1    0x10
#define CM3217_ADDR_COM2    0x11
#define CM3217_ADDR_DATA_MSB    0x10
#define CM3217_ADDR_DATA_LSB    0x11

#define CM3217_COM1_VALUE    0xA7    // (GAIN1:GAIN0)=10, (IT_T1:IT_TO)=01,WMD=1,SD=1,
#define CM3217_COM2_VALUE    0xA0    //100ms


#define SENSOR_ON    1
#define SENSOR_OFF    0
#define LIGHTSENSOR_IOCTL_MAGIC 'l'
#define LIGHTSENSOR_IOCTL_GET_ENABLED     _IOR(LIGHTSENSOR_IOCTL_MAGIC, 1, int *)
#define LIGHTSENSOR_IOCTL_ENABLE     _IOW(LIGHTSENSOR_IOCTL_MAGIC, 2, int *)
#define LIGHTSENSOR_IOCTL_DISABLE        _IOW(LIGHTSENSOR_IOCTL_MAGIC, 3, int *)

struct cm3217_data {
    struct i2c_client    *client;
    struct timer_list    timer;
    struct work_struct    timer_work;
    struct input_dev    *input;
    int power_pin;
    int irq_pin;
    int status;
};
#ifdef CONFIG_HAS_EARLYSUSPEND
static struct early_suspend cm3217_early_suspend;
#endif
static struct cm3217_data *glight;

static int cm3217_command_set(struct i2c_client *client, char *buf, int num)
{
    int ret = 0;
    ret = i2c_master_normal_send(client, buf, num, CM3217_I2C_RATE);
   
    return (ret == num) ? 0 : ret;
}

static int cm3217_command_get(struct i2c_client *client, char *buf, int num)
{
    int ret = 0;
    ret = i2c_master_normal_recv(client, buf, num, CM3217_I2C_RATE);
   
    return (ret == num) ? 0 : ret;
}


static int cm3217_start(struct cm3217_data *data)
{
    struct cm3217_data *cm3217 = data;
    char buf = 0;
    if(cm3217->status)
        return 0;
   
    //if(cm3217->power_pin != INVALID_GPIO)
    //gpio_direction_output(cm3217->power_pin,0);//level = 0 Sensor ON
   
    buf = CM3217_COM1_VALUE & 0xfe ;    //SD=0
    cm3217->client->addr = CM3217_ADDR_COM1;
    cm3217_command_set(cm3217->client, &buf, 1);
   
    cm3217->status = SENSOR_ON;
    cm3217->timer.expires  = jiffies + 1*HZ;
    add_timer(&cm3217->timer);
    DBG("cm3217 light sensor start\n");
    return 0;
}

static int cm3217_stop(struct cm3217_data *data)
{
    struct cm3217_data *cm3217 = data;
    char buf = 0;
    if(cm3217->status == 0)
        return 0;
   
    //if(cm3217->power_pin != INVALID_GPIO)
    //gpio_direction_output(cm3217->power_pin,1);//level = 1 Sensor OFF
   
    buf = CM3217_COM1_VALUE | 0x01 ;    //SD=1
    cm3217->client->addr = CM3217_ADDR_COM1;
    cm3217_command_set(cm3217->client, &buf, 1);
   
    cm3217->status = SENSOR_OFF;
    del_timer(&cm3217->timer);
    DBG("cm3217 light sensor stop\n");
    return 0;
}

#ifdef CONFIG_HAS_EARLYSUSPEND
static void cm3217_suspend(struct early_suspend *h)
{
    struct cm3217_data *cm3217 = glight;
    int status = cm3217->status;
    cm3217_stop(cm3217);
    cm3217->status = status;
    DBG("Light Sensor cm3217 enter suspend cm3217->status %d\n",cm3217->status);
}

static void cm3217_resume(struct early_suspend *h)
{
    struct cm3217_data *cm3217 = glight;
    if(cm3217->status == SENSOR_ON)
    cm3217_start(cm3217);
    DBG("Light Sensor cm3217 enter resume cm3217->status %d\n",cm3217->status);
}
#endif
static int cm3217_open(struct inode *indoe, struct file *file)
{
    return 0;
}

static int cm3217_release(struct inode *inode, struct file *file)
{
    return 0;
}


static long cm3217_ioctl( struct file *file, unsigned int cmd, unsigned long arg)
{
    unsigned int *argp = (unsigned int *)arg;   
    struct cm3217_data *cm3217 = glight;
    switch(cmd){
        case LIGHTSENSOR_IOCTL_GET_ENABLED:
            *argp = cm3217->status;
            break;
        case LIGHTSENSOR_IOCTL_ENABLE:
            if(*argp)
                cm3217_start(cm3217);
            else
                cm3217_stop(cm3217);
            break;
        default:break;
    }
    return 0;
}

static void cm3217_value_report(struct input_dev *input, int data)
{
    unsigned char index = 0;
    if(data <= 10){
        index = 0;goto report;
    }
    else if(data <= 160){
        index = 1;goto report;
    }
    else if(data <= 225){
        index = 2;goto report;
    }
    else if(data <= 320){
        index = 3;goto report;
    }
    else if(data <= 640){
        index = 4;goto report;
    }
    else if(data <= 1280){
        index = 5;goto report;
    }
    else if(data <= 2600){
        index = 6;goto report;
    }
    else{
        index = 7;goto report;
    }

report:
    DBG("cm3217 report data=%d,index = %d\n",data,index);
    input_report_abs(input, ABS_MISC, index);
    input_sync(input);
    return;
}

static void adc_timer(unsigned long data)
{
    struct cm3217_data *cm3217=(struct cm3217_data *)data;
    schedule_work(&cm3217->timer_work);
}

static void adc_timer_work(struct work_struct *work)
{
    int result = 0;
    struct cm3217_data *cm3217 = container_of(work, struct cm3217_data,timer_work);
    char msb = 0, lsb = 0;

    cm3217->client->addr = CM3217_ADDR_DATA_LSB;
    cm3217_command_get(cm3217->client, &lsb, 1);
    cm3217->client->addr = CM3217_ADDR_DATA_MSB;
    cm3217_command_get(cm3217->client, &msb, 1);
    result = ((msb << 8) | lsb) & 0xffff;
    cm3217_value_report(cm3217->input, result);
    DBG("%s:result=%d\n",__func__,result);
   
    if(cm3217->status){
        cm3217->timer.expires  = jiffies + 1*HZ;
        add_timer(&cm3217->timer);
    }
}

static struct file_operations cm3217_fops = {
    .owner = THIS_MODULE,
    .open = cm3217_open,
    .release = cm3217_release,
    .unlocked_ioctl = cm3217_ioctl,
};

static struct miscdevice cm3217_device = {
    .minor = MISC_DYNAMIC_MINOR,
    .name = "lightsensor",
    .fops = &cm3217_fops,
};

static int cm3217_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
    struct cm3217_data *cm3217;   
    struct cm3217_platform_data *pdata = pdata = client->dev.platform_data;   
    char com1 = CM3217_COM1_VALUE, com2 = CM3217_COM2_VALUE;
    int err;
   
    if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
    {
        dev_err(&client->dev, "Must have I2C_FUNC_I2C.\n");
        err = -ENODEV;
        goto alloc_memory_fail;
    }
        
    cm3217 = kmalloc(sizeof(struct cm3217_data), GFP_KERNEL);
    if(!cm3217){
        printk("cm3217 alloc memory err !!!\n");
        err = -ENOMEM;
        goto alloc_memory_fail;
    }   
   
    if(pdata->init_platform_hw)
    pdata->init_platform_hw();

    cm3217->client = client;
    i2c_set_clientdata(client, cm3217);   
    cm3217->power_pin = pdata->power_pin;
    cm3217->irq_pin = pdata->irq_pin;
    cm3217->status = SENSOR_OFF;   
    glight = cm3217;

    //init cm3217
    client->addr = CM3217_ADDR_COM1;
    cm3217_command_set(client, &com1, 1);   
    client->addr = CM3217_ADDR_COM2;
    cm3217_command_set(client, &com2, 1);   
   
    cm3217->input = input_allocate_device();
    if (!cm3217->input) {
        err = -ENOMEM;
        printk(KERN_ERR"cm3217: Failed to allocate input device\n");
        goto exit_input_allocate_device_failed;
    }
    set_bit(EV_ABS, cm3217->input->evbit);
    /* light sensor data */
    input_set_abs_params(cm3217->input, ABS_MISC, 0, 10, 0, 0);
    cm3217->input->name = "lightsensor-level";

    err = input_register_device(cm3217->input);
    if (err < 0) {
        printk(KERN_ERR"cm3217: Unable to register input device: %s\n",cm3217->input->name);                        
        goto exit_input_register_device_failed;
    }
/*   
    if(cm3217->power_pin != INVALID_GPIO)
    {
        gpio_request(cm3217->power_pin, "cm3217_power_pin");
        gpio_pull_updown(cm3217->power_pin,PullDisable);
    }
*/   
    INIT_WORK(&cm3217->timer_work, adc_timer_work);
    setup_timer(&cm3217->timer, adc_timer, (unsigned long)cm3217);
    err = misc_register(&cm3217_device);
    if (err < 0) {
        printk(KERN_ERR"cm3217_probe: lightsensor_device register failed\n");
        goto exit_misc_register_fail;
    }
    printk("lightsensor cm3217 driver created !\n");
    //cm3217_start(cm3217);
#ifdef CONFIG_HAS_EARLYSUSPEND
    cm3217_early_suspend.suspend = cm3217_suspend;
    cm3217_early_suspend.resume = cm3217_resume;
    cm3217_early_suspend.level = 0x2;
    register_early_suspend(&cm3217_early_suspend);
#endif
    return 0;
exit_misc_register_fail:
    //gpio_free(pdata->power_pin);
    input_unregister_device(cm3217->input);
exit_input_register_device_failed:
    input_free_device(cm3217->input);
exit_input_allocate_device_failed:
    kfree(cm3217);
alloc_memory_fail:
    printk("%s error\n",__FUNCTION__);
    return err;
}

static int cm3217_remove(struct i2c_client *client)
{   
    struct cm3217_data *cm3217 = i2c_get_clientdata(client);
    kfree(cm3217);
    input_free_device(cm3217->input);
    input_unregister_device(cm3217->input);
    misc_deregister(&cm3217_device);
    return 0;
}

static const struct i2c_device_id cm3217_id[] = {
    { "lightsensor", 0 },
};

static void cm3217_shutdown(struct i2c_client *client)
{
#ifdef CONFIG_HAS_EARLYSUSPEND
    unregister_early_suspend(&cm3217_early_suspend);
#endif
}

static struct i2c_driver cm3217_driver = {
    .probe = cm3217_probe,
    .remove = __devexit_p(cm3217_remove),
    .shutdown = cm3217_shutdown,
    .id_table = cm3217_id,
    .driver = {
        .owner = THIS_MODULE,
        .name = "lightsensor",
    }
};


static int __init cm3217_init(void)
{
    return i2c_add_driver(&cm3217_driver);
}

static void __exit cm3217_exit(void)
{
    i2c_del_driver(&cm3217_driver);
}

module_init(cm3217_init);
module_exit(cm3217_exit);