// SPDX-License-Identifier: GPL-2.0 // // Freescale i.MX6UL touchscreen controller driver // // Copyright (C) 2015 Freescale Semiconductor, Inc. #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/gpio/consumer.h> #include <linux/input.h> #include <linux/slab.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/of.h> #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/log2.h> /* ADC configuration registers field define */ #define ADC_AIEN … #define ADC_CONV_DISABLE … #define ADC_AVGE … #define ADC_CAL … #define ADC_CALF … #define ADC_12BIT_MODE … #define ADC_CONV_MODE_MASK … #define ADC_IPG_CLK … #define ADC_INPUT_CLK_MASK … #define ADC_CLK_DIV_8 … #define ADC_CLK_DIV_MASK … #define ADC_SHORT_SAMPLE_MODE … #define ADC_SAMPLE_MODE_MASK … #define ADC_HARDWARE_TRIGGER … #define ADC_AVGS_SHIFT … #define ADC_AVGS_MASK … #define SELECT_CHANNEL_4 … #define SELECT_CHANNEL_1 … #define DISABLE_CONVERSION_INT … /* ADC registers */ #define REG_ADC_HC0 … #define REG_ADC_HC1 … #define REG_ADC_HC2 … #define REG_ADC_HC3 … #define REG_ADC_HC4 … #define REG_ADC_HS … #define REG_ADC_R0 … #define REG_ADC_CFG … #define REG_ADC_GC … #define REG_ADC_GS … #define ADC_TIMEOUT … /* TSC registers */ #define REG_TSC_BASIC_SETING … #define REG_TSC_PRE_CHARGE_TIME … #define REG_TSC_FLOW_CONTROL … #define REG_TSC_MEASURE_VALUE … #define REG_TSC_INT_EN … #define REG_TSC_INT_SIG_EN … #define REG_TSC_INT_STATUS … #define REG_TSC_DEBUG_MODE … #define REG_TSC_DEBUG_MODE2 … /* TSC configuration registers field define */ #define DETECT_4_WIRE_MODE … #define AUTO_MEASURE … #define MEASURE_SIGNAL … #define DETECT_SIGNAL … #define VALID_SIGNAL … #define MEASURE_INT_EN … #define MEASURE_SIG_EN … #define VALID_SIG_EN … #define DE_GLITCH_2 … #define START_SENSE … #define TSC_DISABLE … #define DETECT_MODE … struct imx6ul_tsc { … }; /* * TSC module need ADC to get the measure value. So * before config TSC, we should initialize ADC module. */ static int imx6ul_adc_init(struct imx6ul_tsc *tsc) { … } /* * This is a TSC workaround. Currently TSC misconnect two * ADC channels, this function remap channel configure for * hardware trigger. */ static void imx6ul_tsc_channel_config(struct imx6ul_tsc *tsc) { … } /* * TSC setting, confige the pre-charge time and measure delay time. * different touch screen may need different pre-charge time and * measure delay time. */ static void imx6ul_tsc_set(struct imx6ul_tsc *tsc) { … } static int imx6ul_tsc_init(struct imx6ul_tsc *tsc) { … } static void imx6ul_tsc_disable(struct imx6ul_tsc *tsc) { … } /* Delay some time (max 2ms), wait the pre-charge done. */ static bool tsc_wait_detect_mode(struct imx6ul_tsc *tsc) { … } static irqreturn_t tsc_irq_fn(int irq, void *dev_id) { … } static irqreturn_t adc_irq_fn(int irq, void *dev_id) { … } static int imx6ul_tsc_start(struct imx6ul_tsc *tsc) { … } static void imx6ul_tsc_stop(struct imx6ul_tsc *tsc) { … } static int imx6ul_tsc_open(struct input_dev *input_dev) { … } static void imx6ul_tsc_close(struct input_dev *input_dev) { … } static int imx6ul_tsc_probe(struct platform_device *pdev) { … } static int imx6ul_tsc_suspend(struct device *dev) { … } static int imx6ul_tsc_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(imx6ul_tsc_pm_ops, imx6ul_tsc_suspend, imx6ul_tsc_resume); static const struct of_device_id imx6ul_tsc_match[] = …; MODULE_DEVICE_TABLE(of, imx6ul_tsc_match); static struct platform_driver imx6ul_tsc_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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