继上一篇：http://www.cnblogs.com/linhaostudy/p/8303628.html#_label1_1
一、驱动流程解析：
1、模块加载：
1 static struct of_device_id stk_match_table[] = { 2 { .compatible = "stk,stk3x1x", }, 3 { }, 4 }; 5 6 static struct i2c_driver stk_ps_driver = 7 { 8 .driver = { 9 .name = DEVICE_NAME, 10 .owner = THIS_MODULE, 11 .of_match_table = stk_match_table, 12 }, 13 .probe = stk3x1x_probe, 14 .remove = stk3x1x_remove, 15 .id_table = stk_ps_id, 16 }; 17 18 19 static int __init stk3x1x_init(void) 20 { 21 int ret; 22 ret = i2c_add_driver(&stk_ps_driver); 23 if (ret) 24 return ret; 25 26 return 0; 27 } 28 29 static void __exit stk3x1x_exit(void) 30 { 31 i2c_del_driver(&stk_ps_driver); 32 }
of_device_id与DTS中的匹配，这与内核2.6以前的i2c_board_info不一样；
内核加载驱动模块的时候将调用到stk3x1x_init()方法：
初始化了i2c_driver结构体给stk_ps_driver变量，将用于将设备注册到IIC。关键在于结构体中的probe()方法，注册完成的时候将调用；
2、stk3x1x驱动初始化-probe函数：
1 static int stk3x1x_probe(struct i2c_client *client, 2 const struct i2c_device_id *id) 3 { 4 int err = -ENODEV; 5 struct stk3x1x_data *ps_data; 6 struct stk3x1x_platform_data *plat_data; 7 printk(KERN_INFO "%s: driver version = %s ", __func__, DRIVER_VERSION); 8 9 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 10 { 11 printk(KERN_ERR "%s: No Support for I2C_FUNC_SMBUS_BYTE_DATA ", __func__); 12 return -ENODEV; 13 } 14 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) 15 { 16 printk(KERN_ERR "%s: No Support for I2C_FUNC_SMBUS_WORD_DATA ", __func__); 17 return -ENODEV; 18 } 19 20 ps_data = kzalloc(sizeof(struct stk3x1x_data),GFP_KERNEL); 21 if(!ps_data) 22 { 23 printk(KERN_ERR "%s: failed to allocate stk3x1x_data ", __func__); 24 return -ENOMEM; 25 } 26 ps_data->client = client; 27 i2c_set_clientdata(client,ps_data); 28 mutex_init(&ps_data->io_lock); 29 wake_lock_init(&ps_data->ps_wakelock,WAKE_LOCK_SUSPEND, "stk_input_wakelock"); 30 31 #ifdef STK_POLL_PS 32 wake_lock_init(&ps_data->ps_nosuspend_wl,WAKE_LOCK_SUSPEND, "stk_nosuspend_wakelock"); 33 #endif 34 if (client->dev.of_node) { 35 plat_data = devm_kzalloc(&client->dev, 36 sizeof(struct stk3x1x_platform_data), GFP_KERNEL); 37 if (!plat_data) { 38 dev_err(&client->dev, "Failed to allocate memory "); 39 return -ENOMEM; 40 } 41 42 err = stk3x1x_parse_dt(&client->dev, plat_data); 43 dev_err(&client->dev, 44 "%s: stk3x1x_parse_dt ret=%d ", __func__, err); 45 if (err) 46 return err; 47 } else 48 plat_data = client->dev.platform_data; 49 50 if (!plat_data) { 51 dev_err(&client->dev, 52 "%s: no stk3x1x platform data! ", __func__); 53 goto err_als_input_allocate; 54 } 55 ps_data->als_transmittance = plat_data->transmittance; 56 ps_data->int_pin = plat_data->int_pin; 57 ps_data->use_fir = plat_data->use_fir; 58 ps_data->pdata = plat_data; 59 60 if (ps_data->als_transmittance == 0) { 61 dev_err(&client->dev, 62 "%s: Please set als_transmittance ", __func__); 63 goto err_als_input_allocate; 64 } 65 66 ps_data->als_input_dev = devm_input_allocate_device(&client->dev); 67 if (ps_data->als_input_dev==NULL) 68 { 69 printk(KERN_ERR "%s: could not allocate als device ", __func__); 70 err = -ENOMEM; 71 goto err_als_input_allocate; 72 } 73 ps_data->ps_input_dev = devm_input_allocate_device(&client->dev); 74 if (ps_data->ps_input_dev==NULL) 75 { 76 printk(KERN_ERR "%s: could not allocate ps device ", __func__); 77 err = -ENOMEM; 78 goto err_als_input_allocate; 79 } 80 ps_data->als_input_dev->name = ALS_NAME; 81 ps_data->ps_input_dev->name = PS_NAME; 82 set_bit(EV_ABS, ps_data->als_input_dev->evbit); 83 set_bit(EV_ABS, ps_data->ps_input_dev->evbit); 84 input_set_abs_params(ps_data->als_input_dev, ABS_MISC, 0, stk_alscode2lux(ps_data, (1<<16)-1), 0, 0); 85 input_set_abs_params(ps_data->ps_input_dev, ABS_DISTANCE, 0,1, 0, 0); 86 err = input_register_device(ps_data->als_input_dev); 87 if (err<0) 88 { 89 printk(KERN_ERR "%s: can not register als input device ", __func__); 90 goto err_als_input_allocate; 91 } 92 err = input_register_device(ps_data->ps_input_dev); 93 if (err<0) 94 { 95 printk(KERN_ERR "%s: can not register ps input device ", __func__); 96 goto err_als_input_allocate; 97 } 98 99 err = sysfs_create_group(&ps_data->als_input_dev->dev.kobj, &stk_als_attribute_group); 100 if (err < 0) 101 { 102 printk(KERN_ERR "%s:could not create sysfs group for als ", __func__); 103 goto err_als_input_allocate; 104 } 105 err = sysfs_create_group(&ps_data->ps_input_dev->dev.kobj, &stk_ps_attribute_group); 106 if (err < 0) 107 { 108 printk(KERN_ERR "%s:could not create sysfs group for ps ", __func__); 109 goto err_ps_sysfs_create_group; 110 } 111 input_set_drvdata(ps_data->als_input_dev, ps_data); 112 input_set_drvdata(ps_data->ps_input_dev, ps_data); 113 114 #ifdef STK_POLL_ALS 115 ps_data->stk_als_wq = create_singlethread_workqueue("stk_als_wq"); 116 INIT_WORK(&ps_data->stk_als_work, stk_als_work_func); 117 hrtimer_init(&ps_data->als_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 118 ps_data->als_poll_delay = ns_to_ktime(110 * NSEC_PER_MSEC); 119 ps_data->als_timer.function = stk_als_timer_func; 120 #endif 121 122 ps_data->stk_ps_wq = create_singlethread_workqueue("stk_ps_wq"); 123 INIT_WORK(&ps_data->stk_ps_work, stk_ps_work_func); 124 hrtimer_init(&ps_data->ps_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 125 ps_data->ps_poll_delay = ns_to_ktime(110 * NSEC_PER_MSEC); 126 ps_data->ps_timer.function = stk_ps_timer_func; 127 #if (!defined(STK_POLL_ALS) || !defined(STK_POLL_PS)) 128 ps_data->stk_wq = create_singlethread_workqueue("stk_wq"); 129 INIT_WORK(&ps_data->stk_work, stk_work_func); 130 err = stk3x1x_setup_irq(client); 131 if(err < 0) 132 goto err_stk3x1x_setup_irq; 133 #endif 134 135 err = stk3x1x_power_init(ps_data, true); 136 if (err) 137 goto err_power_init; 138 139 err = stk3x1x_power_ctl(ps_data, true); 140 if (err) 141 goto err_power_on; 142 143 ps_data->als_enabled = false; 144 ps_data->ps_enabled = false; 145 #ifdef CONFIG_HAS_EARLYSUSPEND 146 ps_data->stk_early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1; 147 ps_data->stk_early_suspend.suspend = stk3x1x_early_suspend; 148 ps_data->stk_early_suspend.resume = stk3x1x_late_resume; 149 register_early_suspend(&ps_data->stk_early_suspend); 150 #endif 151 /* make sure everything is ok before registering the class device */ 152 ps_data->als_cdev = sensors_light_cdev; 153 ps_data->als_cdev.sensors_enable = stk_als_enable_set; 154 ps_data->als_cdev.sensors_poll_delay = stk_als_poll_delay_set; 155 err = sensors_classdev_register(&client->dev, &ps_data->als_cdev); 156 if (err) 157 goto err_power_on; 158 159 ps_data->ps_cdev = sensors_proximity_cdev; 160 ps_data->ps_cdev.sensors_enable = stk_ps_enable_set; 161 err = sensors_classdev_register(&client->dev, &ps_data->ps_cdev); 162 if (err) 163 goto err_class_sysfs; 164 165 /* enable device power only when it is enabled */ 166 err = stk3x1x_power_ctl(ps_data, false); 167 if (err) 168 goto err_init_all_setting; 169 170 dev_dbg(&client->dev, "%s: probe successfully", __func__); 171 172 return 0; 173 174 err_init_all_setting: 175 stk3x1x_power_ctl(ps_data, false); 176 sensors_classdev_unregister(&ps_data->ps_cdev); 177 err_class_sysfs: 178 sensors_classdev_unregister(&ps_data->als_cdev); 179 err_power_on: 180 stk3x1x_power_init(ps_data, false); 181 err_power_init: 182 #ifndef STK_POLL_PS 183 free_irq(ps_data->irq, ps_data); 184 gpio_free(plat_data->int_pin); 185 #endif 186 #if (!defined(STK_POLL_ALS) || !defined(STK_POLL_PS)) 187 err_stk3x1x_setup_irq: 188 #endif 189 #ifdef STK_POLL_ALS 190 hrtimer_try_to_cancel(&ps_data->als_timer); 191 destroy_workqueue(ps_data->stk_als_wq); 192 #endif 193 destroy_workqueue(ps_data->stk_ps_wq); 194 #if (!defined(STK_POLL_ALS) || !defined(STK_POLL_PS)) 195 destroy_workqueue(ps_data->stk_wq); 196 #endif 197 sysfs_remove_group(&ps_data->ps_input_dev->dev.kobj, &stk_ps_attribute_group); 198 err_ps_sysfs_create_group: 199 sysfs_remove_group(&ps_data->als_input_dev->dev.kobj, &stk_als_attribute_group); 200 err_als_input_allocate: 201 #ifdef STK_POLL_PS 202 wake_lock_destroy(&ps_data->ps_nosuspend_wl); 203 #endif 204 wake_lock_destroy(&ps_data->ps_wakelock); 205 mutex_destroy(&ps_data->io_lock); 206 kfree(ps_data); 207 return err; 208 }
在stk3x1x_probe函数中主要做了：
1、为驱动私有数据结构体stk3x1x_data分配内存空间；
2、 将设备驱动的私有数据(stk3x1x_data)连接到设备client(i2c_client)中；（bma255会增加一步：读取i2c的id）；
3、将stk3x1x驱动注册到linux input子系统；
4、创建工作队列（主要是对sensor的数据采集）；
5、创建sysfs接口；
2.1 创建input子系统：
http://blog.csdn.net/ielife/article/details/7798952
1、 在驱动加载模块中，设置你的input设备支持的事件类型；
2、 注册中断处理函数，例如键盘设备需要编写按键的抬起、放下，触摸屏设备需要编写按下、抬起、绝对移动，鼠标设备需要编写单击、抬起、相对移动，并且需要在必要的时候提交硬件数据（键值/坐标/状态等等）；
3、将输入设备注册到输入子系统中；
1 ps_data->als_input_dev = devm_input_allocate_device(&client->dev); //分配内存空间 2 if (ps_data->als_input_dev==NULL) 3 { 4 printk(KERN_ERR "%s: could not allocate als device ", __func__); 5 err = -ENOMEM; 6 goto err_als_input_allocate; 7 } 8 ps_data->ps_input_dev = devm_input_allocate_device(&client->dev); 9 if (ps_data->ps_input_dev==NULL) 10 { 11 printk(KERN_ERR "%s: could not allocate ps device ", __func__); 12 err = -ENOMEM; 13 goto err_als_input_allocate; 14 } 15 ps_data->als_input_dev->name = ALS_NAME; 16 ps_data->ps_input_dev->name = PS_NAME; 17 set_bit(EV_ABS, ps_data->als_input_dev->evbit); 18 set_bit(EV_ABS, ps_data->ps_input_dev->evbit); 19 input_set_abs_params(ps_data->als_input_dev, ABS_MISC, 0, stk_alscode2lux(ps_data, (1<<16)-1), 0, 0); //设置input加载类型； 20 input_set_abs_params(ps_data->ps_input_dev, ABS_DISTANCE, 0,1, 0, 0); 21 err = input_register_device(ps_data->als_input_dev); 22 if (err<0) 23 { 24 printk(KERN_ERR "%s: can not register als input device ", __func__); 25 goto err_als_input_allocate; 26 } 27 err = input_register_device(ps_data->ps_input_dev); 28 if (err<0) 29 { 30 printk(KERN_ERR "%s: can not register ps input device ", __func__); 31 goto err_als_input_allocate; 32 }
1 err = stk3x1x_setup_irq(client); //设置驱动中断函数 2 if(err < 0) 3 goto err_stk3x1x_setup_irq;
2.2 创建工作队列：
先提一个问题，为什么要创建工作队列？在前面的介绍中我们知道，sensor传感器获取数据后，将数据传给controller的寄存器中，供主控去查询读取数据。所以这里创建的工作队列，就是在一个工作者线程，通过IIC不断的去查询读取controller上的数据。
工作队列的作用就是把工作推后,交由一个内核线程去执行,更直接的说就是如果写了一个函数,而现在不想马上执行它,想在将来某个时刻去执行它,那用工作队列准没错.大概会想到中断也是这样,提供一个中断服务函数,在发生中断的时候去执行,没错,和中断相比,工作队列最大的好处就是可以调度可以睡眠,灵活性更好。
上面代码中我们看到INIT_WORK(&ps_data->stk_ps_work, stk_ps_work_func);，其实是一个宏的定义，在include/linux/workqueue.h中。stk_ps_work_func()就是我们定义的功能函数，用于查询读取Sensor的距离传感器数据的，并上报Input子系统，代码如下：
1 static void stk_ps_work_func(struct work_struct *work) 2 { 3 struct stk3x1x_data *ps_data = container_of(work, struct stk3x1x_data, stk_ps_work); 4 uint32_t reading; 5 int32_t near_far_state; 6 uint8_t org_flag_reg; 7 int32_t ret; 8 uint8_t disable_flag = 0; 9 mutex_lock(&ps_data->io_lock); 10 11 org_flag_reg = stk3x1x_get_flag(ps_data); 12 if(org_flag_reg < 0) 13 { 14 printk(KERN_ERR "%s: get_status_reg fail, ret=%d", __func__, org_flag_reg); 15 goto err_i2c_rw; 16 } 17 near_far_state = (org_flag_reg & STK_FLG_NF_MASK)?1:0; 18 reading = stk3x1x_get_ps_reading(ps_data); 19 if(ps_data->ps_distance_last != near_far_state) 20 { 21 ps_data->ps_distance_last = near_far_state; 22 input_report_abs(ps_data->ps_input_dev, ABS_DISTANCE, near_far_state); //input上报数据 23 input_sync(ps_data->ps_input_dev); //input_sync（）在这里不起关键作用。但如果是一个触摸屏，即有x坐标和y坐标，则需要通过input_sync（）函数把x和y坐标完整地传递给输入子系统。 24 wake_lock_timeout(&ps_data->ps_wakelock, 3*HZ); 25 #ifdef STK_DEBUG_PRINTF 26 printk(KERN_INFO "%s: ps input event %d cm, ps code = %d ",__func__, near_far_state, reading); 27 #endif 28 } 29 ret = stk3x1x_set_flag(ps_data, org_flag_reg, disable_flag); 30 if(ret < 0) 31 { 32 printk(KERN_ERR "%s:stk3x1x_set_flag fail, ret=%d ", __func__, ret); 33 goto err_i2c_rw; 34 } 35 36 mutex_unlock(&ps_data->io_lock); 37 return; 38 39 err_i2c_rw: 40 mutex_unlock(&ps_data->io_lock); 41 msleep(30); 42 return; 43 }
2.3 创建sysfs接口：
为什么要创建sysfs接口？在驱动层创建了sysfs接口，HAL层通过这些sysfs接口，对Sensor进行操作，如使能、设置delay等。
DEVICE_ATTR的使用：http://blog.csdn.net/njuitjf/article/details/16849333
函数宏DEVICE_ATTR内封装的是__ATTR(_name,_mode,_show,_stroe)方法：
_show：表示的是读方法，_stroe表示的是写方法。
1、 调用宏DEVICE_ATTR完成对功能函数的注册：
1 static struct device_attribute ps_enable_attribute = __ATTR(enable,0664,stk_ps_enable_show,stk_ps_enable_store); 2 static struct device_attribute ps_enable_aso_attribute = __ATTR(enableaso,0664,stk_ps_enable_aso_show,stk_ps_enable_aso_store); 3 static struct device_attribute ps_distance_attribute = __ATTR(distance,0664,stk_ps_distance_show, stk_ps_distance_store); 4 static struct device_attribute ps_offset_attribute = __ATTR(offset,0664,stk_ps_offset_show, stk_ps_offset_store); 5 static struct device_attribute ps_code_attribute = __ATTR(code, 0444, stk_ps_code_show, NULL); 6 static struct device_attribute ps_code_thd_l_attribute = __ATTR(codethdl,0664,stk_ps_code_thd_l_show,stk_ps_code_thd_l_store); 7 static struct device_attribute ps_code_thd_h_attribute = __ATTR(codethdh,0664,stk_ps_code_thd_h_show,stk_ps_code_thd_h_store); 8 static struct device_attribute recv_attribute = __ATTR(recv,0664,stk_recv_show,stk_recv_store); 9 static struct device_attribute send_attribute = __ATTR(send,0664,stk_send_show, stk_send_store); 10 static struct device_attribute all_reg_attribute = __ATTR(allreg, 0444, stk_all_reg_show, NULL); 11 12 static struct attribute *stk_ps_attrs [] = 13 { 14 &ps_enable_attribute.attr, 15 &ps_enable_aso_attribute.attr, 16 &ps_distance_attribute.attr, 17 &ps_offset_attribute.attr, 18 &ps_code_attribute.attr, 19 &ps_code_thd_l_attribute.attr, 20 &ps_code_thd_h_attribute.attr, 21 &recv_attribute.attr, 22 &send_attribute.attr, 23 &all_reg_attribute.attr, 24 NULL 25 }; 26 27 static struct attribute_group stk_ps_attribute_group = { 28 .attrs = stk_ps_attrs, 29 };
在probe函数中：
1 err = sysfs_create_group(&ps_data->als_input_dev->dev.kobj, &stk_als_attribute_group); 2 if (err < 0) 3 { 4 printk(KERN_ERR "%s:could not create sysfs group for als ", __func__); 5 goto err_als_input_allocate; 6 } 7 err = sysfs_create_group(&ps_data->ps_input_dev->dev.kobj, &stk_ps_attribute_group); 8 if (err < 0) 9 { 10 printk(KERN_ERR "%s:could not create sysfs group for ps ", __func__); 11 goto err_ps_sysfs_create_group; 12 }
到此，完成了sysfs接口的创建，我们可以在根文件系统中看到/sys/class/input/input1/目录，在该目录下我们可以看到多个节点，其中就包含了enable和delay。我们以enable为例子，可以有两种方法完成对Gsensor的使能工作：
3、读取上报数据：
在Android的HAL层，通过对/sys/class/input/input3/enable节点的写操作，使能sensor。调用到的方法是stk_ps_enable_store函数：
1 static struct device_attribute ps_enable_attribute = __ATTR(enable,0664,stk_ps_enable_show,stk_ps_enable_store); 2 static struct device_attribute ps_enable_aso_attribute = __ATTR(enableaso,0664,stk_ps_enable_aso_show,stk_ps_enable_aso_store); 3 static struct device_attribute ps_distance_attribute = __ATTR(distance,0664,stk_ps_distance_show, stk_ps_distance_store); 4 static struct device_attribute ps_offset_attribute = __ATTR(offset,0664,stk_ps_offset_show, stk_ps_offset_store); 5 static struct device_attribute ps_code_attribute = __ATTR(code, 0444, stk_ps_code_show, NULL); 6 static struct device_attribute ps_code_thd_l_attribute = __ATTR(codethdl,0664,stk_ps_code_thd_l_show,stk_ps_code_thd_l_store); 7 static struct device_attribute ps_code_thd_h_attribute = __ATTR(codethdh,0664,stk_ps_code_thd_h_show,stk_ps_code_thd_h_store); 8 static struct device_attribute recv_attribute = __ATTR(recv,0664,stk_recv_show,stk_recv_store); 9 static struct device_attribute send_attribute = __ATTR(send,0664,stk_send_show, stk_send_store); 10 static struct device_attribute all_reg_attribute = __ATTR(allreg, 0444, stk_all_reg_show, NULL);
里面的show和store函数；
1 static ssize_t stk_ps_enable_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) 2 { 3 struct stk3x1x_data *ps_data = dev_get_drvdata(dev); 4 uint8_t en; 5 if (sysfs_streq(buf, "1")) 6 en = 1; 7 else if (sysfs_streq(buf, "0")) 8 en = 0; 9 else 10 { 11 printk(KERN_ERR "%s, invalid value %d ", __func__, *buf); 12 return -EINVAL; 13 } 14 dev_dbg(dev, "%s: Enable PS : %d ", __func__, en); 15 mutex_lock(&ps_data->io_lock); 16 stk3x1x_enable_ps(ps_data, en); 17 mutex_unlock(&ps_data->io_lock); 18 return size; 19 }
1 static int32_t stk3x1x_enable_ps(struct stk3x1x_data *ps_data, uint8_t enable) 2 { 3 int32_t ret; 4 uint8_t w_state_reg; 5 uint8_t curr_ps_enable; 6 curr_ps_enable = ps_data->ps_enabled?1:0; 7 if(curr_ps_enable == enable) 8 return 0; 9 10 if (enable) { 11 ret = stk3x1x_device_ctl(ps_data, enable); 12 if (ret) 13 return ret; 14 } 15 16 ret = i2c_smbus_read_byte_data(ps_data->client, STK_STATE_REG); 17 if (ret < 0) 18 { 19 printk(KERN_ERR "%s: write i2c error, ret=%d ", __func__, ret); 20 return ret; 21 } 22 w_state_reg = ret; 23 w_state_reg &= ~(STK_STATE_EN_PS_MASK | STK_STATE_EN_WAIT_MASK | 0x60); 24 if(enable) 25 { 26 w_state_reg |= STK_STATE_EN_PS_MASK; 27 if(!(ps_data->als_enabled)) 28 w_state_reg |= STK_STATE_EN_WAIT_MASK; 29 } 30 ret = i2c_smbus_write_byte_data(ps_data->client, STK_STATE_REG, w_state_reg); 31 if (ret < 0) 32 { 33 printk(KERN_ERR "%s: write i2c error, ret=%d ", __func__, ret); 34 return ret; 35 } 36 37 if(enable) 38 { 39 #ifdef STK_POLL_PS 40 hrtimer_start(&ps_data->ps_timer, ps_data->ps_poll_delay, HRTIMER_MODE_REL); //定时一段时间后，开始开启工作队列 41 ps_data->ps_distance_last = -1; 42 #endif 43 ps_data->ps_enabled = true; 44 #ifndef STK_POLL_PS 45 #ifndef STK_POLL_ALS 46 if(!(ps_data->als_enabled)) 47 #endif /* #ifndef STK_POLL_ALS */ 48 enable_irq(ps_data->irq); 49 msleep(1); 50 ret = stk3x1x_get_flag(ps_data); 51 if (ret < 0) 52 { 53 printk(KERN_ERR "%s: read i2c error, ret=%d ", __func__, ret); 54 return ret; 55 } 56 57 near_far_state = ret & STK_FLG_NF_MASK; 58 ps_data->ps_distance_last = near_far_state; 59 input_report_abs(ps_data->ps_input_dev, ABS_DISTANCE, near_far_state); 60 input_sync(ps_data->ps_input_dev); 61 wake_lock_timeout(&ps_data->ps_wakelock, 3*HZ); 62 reading = stk3x1x_get_ps_reading(ps_data); 63 dev_dbg(&ps_data->client->dev, 64 "%s: ps input event=%d, ps code = %d ", 65 __func__, near_far_state, reading); 66 #endif /* #ifndef STK_POLL_PS */ 67 } 68 else 69 { 70 #ifdef STK_POLL_PS 71 hrtimer_cancel(&ps_data->ps_timer); 72 #else 73 #ifndef STK_POLL_ALS 74 if(!(ps_data->als_enabled)) 75 #endif 76 disable_irq(ps_data->irq); 77 #endif 78 ps_data->ps_enabled = false; 79 } 80 if (!enable) { 81 ret = stk3x1x_device_ctl(ps_data, enable); 82 if (ret) 83 return ret; 84 } 85 86 return ret; 87 }
1 static enum hrtimer_restart stk_als_timer_func(struct hrtimer *timer) 2 { 3 struct stk3x1x_data *ps_data = container_of(timer, struct stk3x1x_data, als_timer); 4 queue_work(ps_data->stk_als_wq, &ps_data->stk_als_work); //开启工作队列 5 hrtimer_forward_now(&ps_data->als_timer, ps_data->als_poll_delay); 6 return HRTIMER_RESTART; 7 }
那么对于HAL层，将通过/dev/input/event1设备节点读取到sensor数据。到此，sensor驱动的工作流程完毕。应该很好理解吧！