Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Toradex Colibri VF50 Touchscreen driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright 2015 Toradex AG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Originally authored by Stefan Agner for 3.0 kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/iio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/iio/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/pinctrl/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define DRIVER_NAME			"colibri-vf50-ts"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define VF_ADC_MAX			((1 << 12) - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #define COLI_TOUCH_MIN_DELAY_US		1000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define COLI_TOUCH_MAX_DELAY_US		2000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define COLI_PULLUP_MIN_DELAY_US	10000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define COLI_PULLUP_MAX_DELAY_US	11000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define COLI_TOUCH_NO_OF_AVGS		5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define COLI_TOUCH_REQ_ADC_CHAN		4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) struct vf50_touch_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct input_dev *ts_input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct iio_channel *channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	struct gpio_desc *gpio_xp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct gpio_desc *gpio_xm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct gpio_desc *gpio_yp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	struct gpio_desc *gpio_ym;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	int pen_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	int min_pressure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	bool stop_touchscreen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * Enables given plates and measures touch parameters using ADC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static int adc_ts_measure(struct iio_channel *channel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			  struct gpio_desc *plate_p, struct gpio_desc *plate_m)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	int i, value = 0, val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	gpiod_set_value(plate_p, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	gpiod_set_value(plate_m, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	usleep_range(COLI_TOUCH_MIN_DELAY_US, COLI_TOUCH_MAX_DELAY_US);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	for (i = 0; i < COLI_TOUCH_NO_OF_AVGS; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		error = iio_read_channel_raw(channel, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		if (error < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 			value = error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 			goto error_iio_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		value += val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	value /= COLI_TOUCH_NO_OF_AVGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) error_iio_read:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	gpiod_set_value(plate_p, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	gpiod_set_value(plate_m, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	return value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  * Enable touch detection using falling edge detection on XM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static void vf50_ts_enable_touch_detection(struct vf50_touch_device *vf50_ts)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	/* Enable plate YM (needs to be strong GND, high active) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	gpiod_set_value(vf50_ts->gpio_ym, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	 * Let the platform mux to idle state in order to enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * Pull-Up on GPIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	pinctrl_pm_select_idle_state(&vf50_ts->pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	/* Wait for the pull-up to be stable on high */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	usleep_range(COLI_PULLUP_MIN_DELAY_US, COLI_PULLUP_MAX_DELAY_US);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * ADC touch screen sampling bottom half irq handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static irqreturn_t vf50_ts_irq_bh(int irq, void *private)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct vf50_touch_device *vf50_ts = private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	struct device *dev = &vf50_ts->pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	int val_x, val_y, val_z1, val_z2, val_p = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	bool discard_val_on_start = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	/* Disable the touch detection plates */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	gpiod_set_value(vf50_ts->gpio_ym, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	/* Let the platform mux to default state in order to mux as ADC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	pinctrl_pm_select_default_state(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	while (!vf50_ts->stop_touchscreen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		/* X-Direction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		val_x = adc_ts_measure(&vf50_ts->channels[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 				vf50_ts->gpio_xp, vf50_ts->gpio_xm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		if (val_x < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		/* Y-Direction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		val_y = adc_ts_measure(&vf50_ts->channels[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 				vf50_ts->gpio_yp, vf50_ts->gpio_ym);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		if (val_y < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		 * Touch pressure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		 * Measure on XP/YM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		val_z1 = adc_ts_measure(&vf50_ts->channels[2],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 				vf50_ts->gpio_yp, vf50_ts->gpio_xm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		if (val_z1 < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		val_z2 = adc_ts_measure(&vf50_ts->channels[3],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				vf50_ts->gpio_yp, vf50_ts->gpio_xm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		if (val_z2 < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		/* Validate signal (avoid calculation using noise) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		if (val_z1 > 64 && val_x > 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			 * Calculate resistance between the plates
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			 * lower resistance means higher pressure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			int r_x = (1000 * val_x) / VF_ADC_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			val_p = (r_x * val_z2) / val_z1 - r_x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			val_p = 2000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		val_p = 2000 - val_p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		dev_dbg(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			"Measured values: x: %d, y: %d, z1: %d, z2: %d, p: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			val_x, val_y, val_z1, val_z2, val_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		 * If touch pressure is too low, stop measuring and reenable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		 * touch detection
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		if (val_p < vf50_ts->min_pressure || val_p > 2000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		 * The pressure may not be enough for the first x and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		 * second y measurement, but, the pressure is ok when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		 * driver is doing the third and fourth measurement. To
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		 * take care of this, we drop the first measurement always.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		if (discard_val_on_start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			discard_val_on_start = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			 * Report touch position and sleep for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			 * the next measurement.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			input_report_abs(vf50_ts->ts_input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 					ABS_X, VF_ADC_MAX - val_x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			input_report_abs(vf50_ts->ts_input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 					ABS_Y, VF_ADC_MAX - val_y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			input_report_abs(vf50_ts->ts_input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 					ABS_PRESSURE, val_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			input_report_key(vf50_ts->ts_input, BTN_TOUCH, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			input_sync(vf50_ts->ts_input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		usleep_range(COLI_PULLUP_MIN_DELAY_US,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			     COLI_PULLUP_MAX_DELAY_US);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	/* Report no more touch, re-enable touch detection */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	input_report_abs(vf50_ts->ts_input, ABS_PRESSURE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	input_report_key(vf50_ts->ts_input, BTN_TOUCH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	input_sync(vf50_ts->ts_input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	vf50_ts_enable_touch_detection(vf50_ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static int vf50_ts_open(struct input_dev *dev_input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	struct vf50_touch_device *touchdev = input_get_drvdata(dev_input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	struct device *dev = &touchdev->pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	dev_dbg(dev, "Input device %s opened, starting touch detection\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		dev_input->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	touchdev->stop_touchscreen = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	/* Mux detection before request IRQ, wait for pull-up to settle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	vf50_ts_enable_touch_detection(touchdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static void vf50_ts_close(struct input_dev *dev_input)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	struct vf50_touch_device *touchdev = input_get_drvdata(dev_input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct device *dev = &touchdev->pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	touchdev->stop_touchscreen = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	/* Make sure IRQ is not running past close */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	synchronize_irq(touchdev->pen_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	gpiod_set_value(touchdev->gpio_ym, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	pinctrl_pm_select_default_state(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	dev_dbg(dev, "Input device %s closed, disable touch detection\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		dev_input->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static int vf50_ts_get_gpiod(struct device *dev, struct gpio_desc **gpio_d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			     const char *con_id, enum gpiod_flags flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	*gpio_d = devm_gpiod_get(dev, con_id, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if (IS_ERR(*gpio_d)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		error = PTR_ERR(*gpio_d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		dev_err(dev, "Could not get gpio_%s %d\n", con_id, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static void vf50_ts_channel_release(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct iio_channel *channels = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	iio_channel_release_all(channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) static int vf50_ts_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	struct input_dev *input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct iio_channel *channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	struct vf50_touch_device *touchdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	int num_adc_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	channels = iio_channel_get_all(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	if (IS_ERR(channels))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		return PTR_ERR(channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	error = devm_add_action(dev, vf50_ts_channel_release, channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		iio_channel_release_all(channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		dev_err(dev, "Failed to register iio channel release action");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	num_adc_channels = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	while (channels[num_adc_channels].indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		num_adc_channels++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (num_adc_channels != COLI_TOUCH_REQ_ADC_CHAN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		dev_err(dev, "Inadequate ADC channels specified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	touchdev = devm_kzalloc(dev, sizeof(*touchdev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (!touchdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	touchdev->pdev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	touchdev->channels = channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	error = of_property_read_u32(dev->of_node, "vf50-ts-min-pressure",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 				 &touchdev->min_pressure);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	input = devm_input_allocate_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (!input) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		dev_err(dev, "Failed to allocate TS input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	input->name = DRIVER_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	input->id.bustype = BUS_HOST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	input->dev.parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	input->open = vf50_ts_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	input->close = vf50_ts_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	input_set_capability(input, EV_KEY, BTN_TOUCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	input_set_abs_params(input, ABS_X, 0, VF_ADC_MAX, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	input_set_abs_params(input, ABS_Y, 0, VF_ADC_MAX, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	input_set_abs_params(input, ABS_PRESSURE, 0, VF_ADC_MAX, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	touchdev->ts_input = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	input_set_drvdata(input, touchdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	error = input_register_device(input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		dev_err(dev, "Failed to register input device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	error = vf50_ts_get_gpiod(dev, &touchdev->gpio_xp, "xp", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	error = vf50_ts_get_gpiod(dev, &touchdev->gpio_xm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 				"xm", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	error = vf50_ts_get_gpiod(dev, &touchdev->gpio_yp, "yp", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	error = vf50_ts_get_gpiod(dev, &touchdev->gpio_ym, "ym", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	touchdev->pen_irq = platform_get_irq(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	if (touchdev->pen_irq < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 		return touchdev->pen_irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	error = devm_request_threaded_irq(dev, touchdev->pen_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 					  NULL, vf50_ts_irq_bh, IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 					  "vf50 touch", touchdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		dev_err(dev, "Failed to request IRQ %d: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			touchdev->pen_irq, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static const struct of_device_id vf50_touch_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	{ .compatible = "toradex,vf50-touchscreen", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) MODULE_DEVICE_TABLE(of, vf50_touch_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static struct platform_driver vf50_touch_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		.name = "toradex,vf50_touchctrl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		.of_match_table = vf50_touch_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	.probe = vf50_ts_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) module_platform_driver(vf50_touch_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) MODULE_AUTHOR("Sanchayan Maity");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) MODULE_DESCRIPTION("Colibri VF50 Touchscreen driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) MODULE_LICENSE("GPL");