Orange Pi5 kernel

/*
 * TI Touch Screen driver
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
 
 
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/sort.h>
#include <linux/pm_wakeirq.h>
 
#include <linux/mfd/ti_am335x_tscadc.h>
 
#define ADCFSM_STEPID		0x10
#define SEQ_SETTLE		275
#define MAX_12BIT		((1 << 12) - 1)
 
#define TSC_IRQENB_MASK		(IRQENB_FIFO0THRES | IRQENB_EOS | IRQENB_HW_PEN)
 
static const int config_pins[] = {
<------>STEPCONFIG_XPP,
<------>STEPCONFIG_XNN,
<------>STEPCONFIG_YPP,
<------>STEPCONFIG_YNN,
};
 
struct titsc {
<------>struct input_dev	*input;
<------>struct ti_tscadc_dev	*mfd_tscadc;
<------>struct device		*dev;
<------>unsigned int		irq;
<------>unsigned int		wires;
<------>unsigned int		x_plate_resistance;
<------>bool			pen_down;
<------>int			coordinate_readouts;
<------>u32			config_inp[4];
<------>u32			bit_xp, bit_xn, bit_yp, bit_yn;
<------>u32			inp_xp, inp_xn, inp_yp, inp_yn;
<------>u32			step_mask;
<------>u32			charge_delay;
};
 
static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
{
<------>return readl(ts->mfd_tscadc->tscadc_base + reg);
}
 
static void titsc_writel(struct titsc *tsc, unsigned int reg,
<------><------><------><------><------>unsigned int val)
{
<------>writel(val, tsc->mfd_tscadc->tscadc_base + reg);
}
 
static int titsc_config_wires(struct titsc *ts_dev)
{
<------>u32 analog_line[4];
<------>u32 wire_order[4];
<------>int i, bit_cfg;
 
<------>for (i = 0; i < 4; i++) {
<------><------>/*
<------><------> * Get the order in which TSC wires are attached
<------><------> * w.r.t. each of the analog input lines on the EVM.
<------><------> */
<------><------>analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4;
<------><------>wire_order[i] = ts_dev->config_inp[i] & 0x0F;
<------><------>if (WARN_ON(analog_line[i] > 7))
<------><------><------>return -EINVAL;
<------><------>if (WARN_ON(wire_order[i] > ARRAY_SIZE(config_pins)))
<------><------><------>return -EINVAL;
<------>}
 
<------>for (i = 0; i < 4; i++) {
<------><------>int an_line;
<------><------>int wi_order;
 
<------><------>an_line = analog_line[i];
<------><------>wi_order = wire_order[i];
<------><------>bit_cfg = config_pins[wi_order];
<------><------>if (bit_cfg == 0)
<------><------><------>return -EINVAL;
<------><------>switch (wi_order) {
<------><------>case 0:
<------><------><------>ts_dev->bit_xp = bit_cfg;
<------><------><------>ts_dev->inp_xp = an_line;
<------><------><------>break;
 
<------><------>case 1:
<------><------><------>ts_dev->bit_xn = bit_cfg;
<------><------><------>ts_dev->inp_xn = an_line;
<------><------><------>break;
 
<------><------>case 2:
<------><------><------>ts_dev->bit_yp = bit_cfg;
<------><------><------>ts_dev->inp_yp = an_line;
<------><------><------>break;
<------><------>case 3:
<------><------><------>ts_dev->bit_yn = bit_cfg;
<------><------><------>ts_dev->inp_yn = an_line;
<------><------><------>break;
<------><------>}
<------>}
<------>return 0;
}
 
static void titsc_step_config(struct titsc *ts_dev)
{
<------>unsigned int	config;
<------>int i;
<------>int end_step, first_step, tsc_steps;
<------>u32 stepenable;
 
<------>config = STEPCONFIG_MODE_HWSYNC |
<------><------><------>STEPCONFIG_AVG_16 | ts_dev->bit_xp;
<------>switch (ts_dev->wires) {
<------>case 4:
<------><------>config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
<------><------>break;
<------>case 5:
<------><------>config |= ts_dev->bit_yn |
<------><------><------><------>STEPCONFIG_INP_AN4 | ts_dev->bit_xn |
<------><------><------><------>ts_dev->bit_yp;
<------><------>break;
<------>case 8:
<------><------>config |= STEPCONFIG_INP(ts_dev->inp_yp) | ts_dev->bit_xn;
<------><------>break;
<------>}
 
<------>tsc_steps = ts_dev->coordinate_readouts * 2 + 2;
<------>first_step = TOTAL_STEPS - tsc_steps;
<------>/* Steps 16 to 16-coordinate_readouts is for X */
<------>end_step = first_step + tsc_steps;
<------>for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) {
<------><------>titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
<------><------>titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
<------>}
 
<------>config = 0;
<------>config = STEPCONFIG_MODE_HWSYNC |
<------><------><------>STEPCONFIG_AVG_16 | ts_dev->bit_yn |
<------><------><------>STEPCONFIG_INM_ADCREFM;
<------>switch (ts_dev->wires) {
<------>case 4:
<------><------>config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
<------><------>break;
<------>case 5:
<------><------>config |= ts_dev->bit_xp | STEPCONFIG_INP_AN4 |
<------><------><------><------>STEPCONFIG_XNP | STEPCONFIG_YPN;
<------><------>break;
<------>case 8:
<------><------>config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
<------><------>break;
<------>}
 
<------>/* 1 ... coordinate_readouts is for Y */
<------>end_step = first_step + ts_dev->coordinate_readouts;
<------>for (i = first_step; i < end_step; i++) {
<------><------>titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
<------><------>titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
<------>}
 
<------>/* Make CHARGECONFIG same as IDLECONFIG */
 
<------>config = titsc_readl(ts_dev, REG_IDLECONFIG);
<------>titsc_writel(ts_dev, REG_CHARGECONFIG, config);
<------>titsc_writel(ts_dev, REG_CHARGEDELAY, ts_dev->charge_delay);
 
<------>/* coordinate_readouts + 1 ... coordinate_readouts + 2 is for Z */
<------>config = STEPCONFIG_MODE_HWSYNC |
<------><------><------>STEPCONFIG_AVG_16 | ts_dev->bit_yp |
<------><------><------>ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
<------><------><------>STEPCONFIG_INP(ts_dev->inp_xp);
<------>titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
<------>titsc_writel(ts_dev, REG_STEPDELAY(end_step),
<------><------><------>STEPCONFIG_OPENDLY);
 
<------>end_step++;
<------>config |= STEPCONFIG_INP(ts_dev->inp_yn);
<------>titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
<------>titsc_writel(ts_dev, REG_STEPDELAY(end_step),
<------><------><------>STEPCONFIG_OPENDLY);
 
<------>/* The steps end ... end - readouts * 2 + 2 and bit 0 for TS_Charge */
<------>stepenable = 1;
<------>for (i = 0; i < tsc_steps; i++)
<------><------>stepenable |= 1 << (first_step + i + 1);
 
<------>ts_dev->step_mask = stepenable;
<------>am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask);
}
 
static int titsc_cmp_coord(const void *a, const void *b)
{
<------>return *(int *)a - *(int *)b;
}
 
static void titsc_read_coordinates(struct titsc *ts_dev,
<------><------>u32 *x, u32 *y, u32 *z1, u32 *z2)
{
<------>unsigned int yvals[7], xvals[7];
<------>unsigned int i, xsum = 0, ysum = 0;
<------>unsigned int creads = ts_dev->coordinate_readouts;
 
<------>for (i = 0; i < creads; i++) {
<------><------>yvals[i] = titsc_readl(ts_dev, REG_FIFO0);
<------><------>yvals[i] &= 0xfff;
<------>}
 
<------>*z1 = titsc_readl(ts_dev, REG_FIFO0);
<------>*z1 &= 0xfff;
<------>*z2 = titsc_readl(ts_dev, REG_FIFO0);
<------>*z2 &= 0xfff;
 
<------>for (i = 0; i < creads; i++) {
<------><------>xvals[i] = titsc_readl(ts_dev, REG_FIFO0);
<------><------>xvals[i] &= 0xfff;
<------>}
 
<------>/*
<------> * If co-ordinates readouts is less than 4 then
<------> * report the average. In case of 4 or more
<------> * readouts, sort the co-ordinate samples, drop
<------> * min and max values and report the average of
<------> * remaining values.
<------> */
<------>if (creads <=  3) {
<------><------>for (i = 0; i < creads; i++) {
<------><------><------>ysum += yvals[i];
<------><------><------>xsum += xvals[i];
<------><------>}
<------><------>ysum /= creads;
<------><------>xsum /= creads;
<------>} else {
<------><------>sort(yvals, creads, sizeof(unsigned int),
<------><------>     titsc_cmp_coord, NULL);
<------><------>sort(xvals, creads, sizeof(unsigned int),
<------><------>     titsc_cmp_coord, NULL);
<------><------>for (i = 1; i < creads - 1; i++) {
<------><------><------>ysum += yvals[i];
<------><------><------>xsum += xvals[i];
<------><------>}
<------><------>ysum /= creads - 2;
<------><------>xsum /= creads - 2;
<------>}
<------>*y = ysum;
<------>*x = xsum;
}
 
static irqreturn_t titsc_irq(int irq, void *dev)
{
<------>struct titsc *ts_dev = dev;
<------>struct input_dev *input_dev = ts_dev->input;
<------>unsigned int fsm, status, irqclr = 0;
<------>unsigned int x = 0, y = 0;
<------>unsigned int z1, z2, z;
 
<------>status = titsc_readl(ts_dev, REG_RAWIRQSTATUS);
<------>if (status & IRQENB_HW_PEN) {
<------><------>ts_dev->pen_down = true;
<------><------>irqclr |= IRQENB_HW_PEN;
<------><------>pm_stay_awake(ts_dev->dev);
<------>}
 
<------>if (status & IRQENB_PENUP) {
<------><------>fsm = titsc_readl(ts_dev, REG_ADCFSM);
<------><------>if (fsm == ADCFSM_STEPID) {
<------><------><------>ts_dev->pen_down = false;
<------><------><------>input_report_key(input_dev, BTN_TOUCH, 0);
<------><------><------>input_report_abs(input_dev, ABS_PRESSURE, 0);
<------><------><------>input_sync(input_dev);
<------><------><------>pm_relax(ts_dev->dev);
<------><------>} else {
<------><------><------>ts_dev->pen_down = true;
<------><------>}
<------><------>irqclr |= IRQENB_PENUP;
<------>}
 
<------>if (status & IRQENB_EOS)
<------><------>irqclr |= IRQENB_EOS;
 
<------>/*
<------> * ADC and touchscreen share the IRQ line.
<------> * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only
<------> */
<------>if (status & IRQENB_FIFO0THRES) {
 
<------><------>titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
 
<------><------>if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
<------><------><------>/*
<------><------><------> * Calculate pressure using formula
<------><------><------> * Resistance(touch) = x plate resistance *
<------><------><------> * x postion/4096 * ((z2 / z1) - 1)
<------><------><------> */
<------><------><------>z = z1 - z2;
<------><------><------>z *= x;
<------><------><------>z *= ts_dev->x_plate_resistance;
<------><------><------>z /= z2;
<------><------><------>z = (z + 2047) >> 12;
 
<------><------><------>if (z <= MAX_12BIT) {
<------><------><------><------>input_report_abs(input_dev, ABS_X, x);
<------><------><------><------>input_report_abs(input_dev, ABS_Y, y);
<------><------><------><------>input_report_abs(input_dev, ABS_PRESSURE, z);
<------><------><------><------>input_report_key(input_dev, BTN_TOUCH, 1);
<------><------><------><------>input_sync(input_dev);
<------><------><------>}
<------><------>}
<------><------>irqclr |= IRQENB_FIFO0THRES;
<------>}
<------>if (irqclr) {
<------><------>titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
<------><------>if (status & IRQENB_EOS)
<------><------><------>am335x_tsc_se_set_cache(ts_dev->mfd_tscadc,
<------><------><------><------><------><------>ts_dev->step_mask);
<------><------>return IRQ_HANDLED;
<------>}
<------>return IRQ_NONE;
}
 
static int titsc_parse_dt(struct platform_device *pdev,
<------><------><------><------><------>struct titsc *ts_dev)
{
<------>struct device_node *node = pdev->dev.of_node;
<------>int err;
 
<------>if (!node)
<------><------>return -EINVAL;
 
<------>err = of_property_read_u32(node, "ti,wires", &ts_dev->wires);
<------>if (err < 0)
<------><------>return err;
<------>switch (ts_dev->wires) {
<------>case 4:
<------>case 5:
<------>case 8:
<------><------>break;
<------>default:
<------><------>return -EINVAL;
<------>}
 
<------>err = of_property_read_u32(node, "ti,x-plate-resistance",
<------><------><------>&ts_dev->x_plate_resistance);
<------>if (err < 0)
<------><------>return err;
 
<------>/*
<------> * Try with the new binding first. If it fails, try again with
<------> * bogus, miss-spelled version.
<------> */
<------>err = of_property_read_u32(node, "ti,coordinate-readouts",
<------><------><------>&ts_dev->coordinate_readouts);
<------>if (err < 0) {
<------><------>dev_warn(&pdev->dev, "please use 'ti,coordinate-readouts' instead\n");
<------><------>err = of_property_read_u32(node, "ti,coordiante-readouts",
<------><------><------><------>&ts_dev->coordinate_readouts);
<------>}
 
<------>if (err < 0)
<------><------>return err;
 
<------>if (ts_dev->coordinate_readouts <= 0) {
<------><------>dev_warn(&pdev->dev,
<------><------><------> "invalid co-ordinate readouts, resetting it to 5\n");
<------><------>ts_dev->coordinate_readouts = 5;
<------>}
 
<------>err = of_property_read_u32(node, "ti,charge-delay",
<------><------><------><------>   &ts_dev->charge_delay);
<------>/*
<------> * If ti,charge-delay value is not specified, then use
<------> * CHARGEDLY_OPENDLY as the default value.
<------> */
<------>if (err < 0) {
<------><------>ts_dev->charge_delay = CHARGEDLY_OPENDLY;
<------><------>dev_warn(&pdev->dev, "ti,charge-delay not specified\n");
<------>}
 
<------>return of_property_read_u32_array(node, "ti,wire-config",
<------><------><------>ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp));
}
 
/*
 * The functions for inserting/removing driver as a module.
 */
 
static int titsc_probe(struct platform_device *pdev)
{
<------>struct titsc *ts_dev;
<------>struct input_dev *input_dev;
<------>struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev);
<------>int err;
 
<------>/* Allocate memory for device */
<------>ts_dev = kzalloc(sizeof(*ts_dev), GFP_KERNEL);
<------>input_dev = input_allocate_device();
<------>if (!ts_dev || !input_dev) {
<------><------>dev_err(&pdev->dev, "failed to allocate memory.\n");
<------><------>err = -ENOMEM;
<------><------>goto err_free_mem;
<------>}
 
<------>tscadc_dev->tsc = ts_dev;
<------>ts_dev->mfd_tscadc = tscadc_dev;
<------>ts_dev->input = input_dev;
<------>ts_dev->irq = tscadc_dev->irq;
<------>ts_dev->dev = &pdev->dev;
 
<------>err = titsc_parse_dt(pdev, ts_dev);
<------>if (err) {
<------><------>dev_err(&pdev->dev, "Could not find valid DT data.\n");
<------><------>goto err_free_mem;
<------>}
 
<------>err = request_irq(ts_dev->irq, titsc_irq,
<------><------><------>  IRQF_SHARED, pdev->dev.driver->name, ts_dev);
<------>if (err) {
<------><------>dev_err(&pdev->dev, "failed to allocate irq.\n");
<------><------>goto err_free_mem;
<------>}
 
<------>device_init_wakeup(&pdev->dev, true);
<------>err = dev_pm_set_wake_irq(&pdev->dev, ts_dev->irq);
<------>if (err)
<------><------>dev_err(&pdev->dev, "irq wake enable failed.\n");
 
<------>titsc_writel(ts_dev, REG_IRQSTATUS, TSC_IRQENB_MASK);
<------>titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES);
<------>titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_EOS);
<------>err = titsc_config_wires(ts_dev);
<------>if (err) {
<------><------>dev_err(&pdev->dev, "wrong i/p wire configuration\n");
<------><------>goto err_free_irq;
<------>}
<------>titsc_step_config(ts_dev);
<------>titsc_writel(ts_dev, REG_FIFO0THR,
<------><------><------>ts_dev->coordinate_readouts * 2 + 2 - 1);
 
<------>input_dev->name = "ti-tsc";
<------>input_dev->dev.parent = &pdev->dev;
 
<------>input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
<------>input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 
<------>input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
<------>input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
<------>input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);
 
<------>/* register to the input system */
<------>err = input_register_device(input_dev);
<------>if (err)
<------><------>goto err_free_irq;
 
<------>platform_set_drvdata(pdev, ts_dev);
<------>return 0;
 
err_free_irq:
<------>dev_pm_clear_wake_irq(&pdev->dev);
<------>device_init_wakeup(&pdev->dev, false);
<------>free_irq(ts_dev->irq, ts_dev);
err_free_mem:
<------>input_free_device(input_dev);
<------>kfree(ts_dev);
<------>return err;
}
 
static int titsc_remove(struct platform_device *pdev)
{
<------>struct titsc *ts_dev = platform_get_drvdata(pdev);
<------>u32 steps;
 
<------>dev_pm_clear_wake_irq(&pdev->dev);
<------>device_init_wakeup(&pdev->dev, false);
<------>free_irq(ts_dev->irq, ts_dev);
 
<------>/* total steps followed by the enable mask */
<------>steps = 2 * ts_dev->coordinate_readouts + 2;
<------>steps = (1 << steps) - 1;
<------>am335x_tsc_se_clr(ts_dev->mfd_tscadc, steps);
 
<------>input_unregister_device(ts_dev->input);
 
<------>kfree(ts_dev);
<------>return 0;
}
 
static int __maybe_unused titsc_suspend(struct device *dev)
{
<------>struct titsc *ts_dev = dev_get_drvdata(dev);
<------>unsigned int idle;
 
<------>if (device_may_wakeup(dev)) {
<------><------>titsc_writel(ts_dev, REG_IRQSTATUS, TSC_IRQENB_MASK);
<------><------>idle = titsc_readl(ts_dev, REG_IRQENABLE);
<------><------>titsc_writel(ts_dev, REG_IRQENABLE,
<------><------><------><------>(idle | IRQENB_HW_PEN));
<------><------>titsc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB);
<------>}
<------>return 0;
}
 
static int __maybe_unused titsc_resume(struct device *dev)
{
<------>struct titsc *ts_dev = dev_get_drvdata(dev);
 
<------>if (device_may_wakeup(dev)) {
<------><------>titsc_writel(ts_dev, REG_IRQWAKEUP,
<------><------><------><------>0x00);
<------><------>titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
<------><------>pm_relax(dev);
<------>}
<------>titsc_step_config(ts_dev);
<------>titsc_writel(ts_dev, REG_FIFO0THR,
<------><------><------>ts_dev->coordinate_readouts * 2 + 2 - 1);
<------>return 0;
}
 
static SIMPLE_DEV_PM_OPS(titsc_pm_ops, titsc_suspend, titsc_resume);
 
static const struct of_device_id ti_tsc_dt_ids[] = {
<------>{ .compatible = "ti,am3359-tsc", },
<------>{ }
};
MODULE_DEVICE_TABLE(of, ti_tsc_dt_ids);
 
static struct platform_driver ti_tsc_driver = {
<------>.probe	= titsc_probe,
<------>.remove	= titsc_remove,
<------>.driver	= {
<------><------>.name   = "TI-am335x-tsc",
<------><------>.pm	= &titsc_pm_ops,
<------><------>.of_match_table = ti_tsc_dt_ids,
<------>},
};
module_platform_driver(ti_tsc_driver);
 
MODULE_DESCRIPTION("TI touchscreen controller driver");
MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
MODULE_LICENSE("GPL");