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触模屏驱动fts.c
kernel/msm-4.4/drivers/input/touchscreen/st/fts.c ST FingerTips msm8998:/ # getevent add device 7: /dev/input/event4 name: “fts” X_AXIS_MAX: 1440 Y_AXIS_MAX: 2560 I2C接口:gpio_87/88 ts_i2c_sda/scl 中断:GPIO_125 TP_INT_N 复位:GPIO_89 TP_RST_Nstatic struct of_device_id fts_of_match_table[] = { { .compatible = "st,fts", }, {},};在kernel/msm-4.4/arch/arm/boot/dts/qcom/msm8998-qrd-skuk-hdk.dtsi里&i2c_5 { status = "okay"; st_fts@49 { compatible = "st,fts"; reg = <0x49>; interrupt-parent = <&tlmm>; interrupts = <125 0x2008>; vdd-supply = <&pm8998_l6>; avdd-supply = <&pm8998_l28>; pinctrl-names = "pmx_ts_active", "pmx_ts_suspend"; pinctrl-0 = <&ts_active>; pinctrl-1 = <&ts_int_suspend &ts_reset_suspend>; st,irq-gpio = <&tlmm 125 0x2008>; st,reset-gpio = <&tlmm 89 0x00>; st,regulator_dvdd = "vdd"; st,regulator_avdd = "avdd"; };}; static int fts_probe(struct i2c_client *client, const struct i2c_device_id *idp){ ... struct device_node *dp = client->dev.of_node; ... if (dp) { ... parse_dt(&client->dev, info->bdata); } ... info->fwu_workqueue = create_singlethread_workqueue("fts-fwu-queue");//创建workqueue,创建内核线程//msm8998:/ # ps | grep fts-fwu-queue root 565 2 0 0 rescuer_th 0000000000 S fts-fwu-queue}static int parse_dt(struct device *dev, struct fts_i2c_platform_data *bdata){... struct device_node *np = dev->of_node; bdata->irq_gpio = of_get_named_gpio_flags(np, "st,irq-gpio", 0, NULL);if (of_property_read_bool(np, "st, reset-gpio")) { bdata->reset_gpio = of_get_named_gpio_flags(np, "st, reset-gpio", 0, NULL); logError(0, "%s reset_gpio =%d\n", tag, bdata->reset_gpio); } else { bdata->reset_gpio = GPIO_NOT_DEFINED; }} of_get_named_gpio_flags(np,”st,irq-gpio”, 0, NULL);
of_get_named_gpio_flags(np,”st, reset-gpio”, 0, NULL); 从dts中获取gpio int of_get_named_gpio_flags(struct device_node *np, const char *list_name, int index, enum of_gpio_flags *flags)request_irq(info->client->irq, fts_interrupt_handler, IRQF_TRIGGER_LOW, info->client->name, info))static irqreturn_t fts_interrupt_handler(int irq, void *handle){ struct fts_ts_info *info = handle; disable_irq_nosync(info->client->irq); queue_work(info->event_wq, &info->work);//把耗时的操作放在工作队列中断底半部 return IRQ_HANDLED;}INIT_WORK(&info->work, fts_event_handler);static void fts_event_handler(struct work_struct *work){input_sync(info->input_dev);//)同步用于告诉input core子系统报告结束} 转载地址：http://bakni.baihongyu.com/