内核：linux3.6； 平台：IMX6Q； io口下降沿中断触发，调用线程函数，线程读取光感值，并更新在input的节点下。
1、 kernel_imx/arch/arm/mach-mx6: Board-mx6q_sabresd.c
static struct i2c_board_info mxc_i2c0_board_info[] __initdata = {... { I2C_BOARD_INFO("LTR_558ALS", 0x23), .irq = gpio_to_irq(ALS_LIGHT_SENSOR_INT), },...};2、 kernel_imx/drivers/input/misc：Ltr558.c
static int __init ltr558_driverinit(void){ return i2c_add_driver(<r558_driver);}static int ltr558_PRobe(struct i2c_client *client, const struct i2c_device_id *id){ struct ltr558_chip *chip = NULL; struct input_dev *pinput_dev = NULL; struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); int ret = 0; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) return -EIO; printk("ltr558_probe start ...%s/n",id->name); chip = kzalloc(sizeof(struct ltr558_chip), GFP_KERNEL); if (!chip) return -ENOMEM; dev_dbg(&client->dev, "%s() called/n", __func__); i2c_set_clientdata(client, chip); chip->client = client; /* if (chip->irq > 0) { ret = request_threaded_irq(chip->irq, NULL, threshold_isr, IRQF_SHARED, "LTR558_ALS", chip); if (ret) { dev_err(&client->dev, "Unable to register irq %d; " "ret %d/n", chip->irq, ret); goto exit_free; } } */ mutex_init(&chip->lock);/* ret = ltr558_chip_init(client); if (ret) goto exit_irq;*/ pinput_dev = input_allocate_device(); if (!pinput_dev) { ret = -ENOMEM; goto exit_irq; } chip->input = pinput_dev; pinput_dev->name = "isl29023 light sensor"; pinput_dev->id.bustype = BUS_I2C; pinput_dev->phys = chip->phys; __set_bit(EV_ABS, pinput_dev->evbit); input_set_abs_params(pinput_dev, ABS_MISC, 0,65535, 0, 0); ret = input_register_device(pinput_dev); if (ret) goto exit_irq; /* register sysfs hooks */ ret = sysfs_create_group(&client->dev.kobj, <r558_group); if (ret) goto exit_irq; chip->irq = client->irq; /* set irq type to edge falling */ if (chip->irq > 0){ printk("irq start .../n"); irq_set_irq_type(client->irq, IRQF_TRIGGER_FALLING); ret = request_irq(client->irq, ltr558_irq_handler, 0, client->dev.driver->name, chip); if (ret < 0) { dev_err(&client->dev, "failed to register irq %d!/n", client->irq); goto exit_irq; } } chip->workqueue = create_singlethread_workqueue("isl29023"); INIT_WORK(&chip->work, ltr558_work); if (chip->workqueue == NULL) { dev_err(&client->dev, "couldn't create workqueue/n"); ret = -ENOMEM; goto exit_irq; } ret = ltr558_chip_init(client); if (ret) goto exit_irq; printk("success of init ltr558_probe/n"); return 0;exit_irq: if (chip->irq > 0) free_irq(chip->irq, chip); if(pinput_dev) input_free_device(pinput_dev); return ret;}新闻热点
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