// SPDX-License-Identifier: GPL-2.0-or-later /* * Allwinner sunxi resistive touchscreen controller driver * * Copyright (C) 2013 - 2014 Hans de Goede <[email protected]> * * The hwmon parts are based on work by Corentin LABBE which is: * Copyright (C) 2013 Corentin LABBE <[email protected]> */ /* * The sun4i-ts controller is capable of detecting a second touch, but when a * second touch is present then the accuracy becomes so bad the reported touch * location is not useable. * * The original android driver contains some complicated heuristics using the * aprox. distance between the 2 touches to see if the user is making a pinch * open / close movement, and then reports emulated multi-touch events around * the last touch coordinate (as the dual-touch coordinates are worthless). * * These kinds of heuristics are just asking for trouble (and don't belong * in the kernel). So this driver offers straight forward, reliable single * touch functionality only. * * s.a. A20 User Manual "1.15 TP" (Documentation/arch/arm/sunxi.rst) * (looks like the description in the A20 User Manual v1.3 is better * than the one in the A10 User Manual v.1.5) */ #include <linux/err.h> #include <linux/hwmon.h> #include <linux/thermal.h> #include <linux/init.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/slab.h> #define TP_CTRL0 … #define TP_CTRL1 … #define TP_CTRL2 … #define TP_CTRL3 … #define TP_INT_FIFOC … #define TP_INT_FIFOS … #define TP_TPR … #define TP_CDAT … #define TEMP_DATA … #define TP_DATA … /* TP_CTRL0 bits */ #define ADC_FIRST_DLY(x) … #define ADC_FIRST_DLY_MODE(x) … #define ADC_CLK_SEL(x) … #define ADC_CLK_DIV(x) … #define FS_DIV(x) … #define T_ACQ(x) … /* TP_CTRL1 bits */ #define STYLUS_UP_DEBOUN(x) … #define STYLUS_UP_DEBOUN_EN(x) … #define TOUCH_PAN_CALI_EN(x) … #define TP_DUAL_EN(x) … #define TP_MODE_EN(x) … #define TP_ADC_SELECT(x) … #define ADC_CHAN_SELECT(x) … /* on sun6i, bits 3~6 are left shifted by 1 to 4~7 */ #define SUN6I_TP_MODE_EN(x) … /* TP_CTRL2 bits */ #define TP_SENSITIVE_ADJUST(x) … #define TP_MODE_SELECT(x) … #define PRE_MEA_EN(x) … #define PRE_MEA_THRE_CNT(x) … /* TP_CTRL3 bits */ #define FILTER_EN(x) … #define FILTER_TYPE(x) … /* TP_INT_FIFOC irq and fifo mask / control bits */ #define TEMP_IRQ_EN(x) … #define OVERRUN_IRQ_EN(x) … #define DATA_IRQ_EN(x) … #define TP_DATA_XY_CHANGE(x) … #define FIFO_TRIG(x) … #define DATA_DRQ_EN(x) … #define FIFO_FLUSH(x) … #define TP_UP_IRQ_EN(x) … #define TP_DOWN_IRQ_EN(x) … /* TP_INT_FIFOS irq and fifo status bits */ #define TEMP_DATA_PENDING … #define FIFO_OVERRUN_PENDING … #define FIFO_DATA_PENDING … #define TP_IDLE_FLG … #define TP_UP_PENDING … #define TP_DOWN_PENDING … /* TP_TPR bits */ #define TEMP_ENABLE(x) … #define TEMP_PERIOD(x) … struct sun4i_ts_data { … }; static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val) { … } static irqreturn_t sun4i_ts_irq(int irq, void *dev_id) { … } static int sun4i_ts_open(struct input_dev *dev) { … } static void sun4i_ts_close(struct input_dev *dev) { … } static int sun4i_get_temp(const struct sun4i_ts_data *ts, int *temp) { … } static int sun4i_get_tz_temp(struct thermal_zone_device *tz, int *temp) { … } static const struct thermal_zone_device_ops sun4i_ts_tz_ops = …; static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { … } static ssize_t show_temp_label(struct device *dev, struct device_attribute *devattr, char *buf) { … } static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL); static struct attribute *sun4i_ts_attrs[] = …; ATTRIBUTE_GROUPS(…); static int sun4i_ts_probe(struct platform_device *pdev) { … } static void sun4i_ts_remove(struct platform_device *pdev) { … } static const struct of_device_id sun4i_ts_of_match[] = …; MODULE_DEVICE_TABLE(of, sun4i_ts_of_match); static struct platform_driver sun4i_ts_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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