fts touchscreen

1.查找驱动

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_N

static 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";};
};

2.驱动解析

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
}

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fts touchscreen

1.查找驱动

2.驱动解析

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