402 lines
11 KiB
C
402 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Touchscreen driver for WM831x PMICs
|
|
*
|
|
* Copyright 2011 Wolfson Microelectronics plc.
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/input.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mfd/wm831x/core.h>
|
|
#include <linux/mfd/wm831x/irq.h>
|
|
#include <linux/mfd/wm831x/pdata.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
|
|
/*
|
|
* R16424 (0x4028) - Touch Control 1
|
|
*/
|
|
#define WM831X_TCH_ENA 0x8000 /* TCH_ENA */
|
|
#define WM831X_TCH_CVT_ENA 0x4000 /* TCH_CVT_ENA */
|
|
#define WM831X_TCH_SLPENA 0x1000 /* TCH_SLPENA */
|
|
#define WM831X_TCH_Z_ENA 0x0400 /* TCH_Z_ENA */
|
|
#define WM831X_TCH_Y_ENA 0x0200 /* TCH_Y_ENA */
|
|
#define WM831X_TCH_X_ENA 0x0100 /* TCH_X_ENA */
|
|
#define WM831X_TCH_DELAY_MASK 0x00E0 /* TCH_DELAY - [7:5] */
|
|
#define WM831X_TCH_DELAY_SHIFT 5 /* TCH_DELAY - [7:5] */
|
|
#define WM831X_TCH_DELAY_WIDTH 3 /* TCH_DELAY - [7:5] */
|
|
#define WM831X_TCH_RATE_MASK 0x001F /* TCH_RATE - [4:0] */
|
|
#define WM831X_TCH_RATE_SHIFT 0 /* TCH_RATE - [4:0] */
|
|
#define WM831X_TCH_RATE_WIDTH 5 /* TCH_RATE - [4:0] */
|
|
|
|
/*
|
|
* R16425 (0x4029) - Touch Control 2
|
|
*/
|
|
#define WM831X_TCH_PD_WK 0x2000 /* TCH_PD_WK */
|
|
#define WM831X_TCH_5WIRE 0x1000 /* TCH_5WIRE */
|
|
#define WM831X_TCH_PDONLY 0x0800 /* TCH_PDONLY */
|
|
#define WM831X_TCH_ISEL 0x0100 /* TCH_ISEL */
|
|
#define WM831X_TCH_RPU_MASK 0x000F /* TCH_RPU - [3:0] */
|
|
#define WM831X_TCH_RPU_SHIFT 0 /* TCH_RPU - [3:0] */
|
|
#define WM831X_TCH_RPU_WIDTH 4 /* TCH_RPU - [3:0] */
|
|
|
|
/*
|
|
* R16426-8 (0x402A-C) - Touch Data X/Y/X
|
|
*/
|
|
#define WM831X_TCH_PD 0x8000 /* TCH_PD1 */
|
|
#define WM831X_TCH_DATA_MASK 0x0FFF /* TCH_DATA - [11:0] */
|
|
#define WM831X_TCH_DATA_SHIFT 0 /* TCH_DATA - [11:0] */
|
|
#define WM831X_TCH_DATA_WIDTH 12 /* TCH_DATA - [11:0] */
|
|
|
|
struct wm831x_ts {
|
|
struct input_dev *input_dev;
|
|
struct wm831x *wm831x;
|
|
unsigned int data_irq;
|
|
unsigned int pd_irq;
|
|
bool pressure;
|
|
bool pen_down;
|
|
struct work_struct pd_data_work;
|
|
};
|
|
|
|
static void wm831x_pd_data_work(struct work_struct *work)
|
|
{
|
|
struct wm831x_ts *wm831x_ts =
|
|
container_of(work, struct wm831x_ts, pd_data_work);
|
|
|
|
if (wm831x_ts->pen_down) {
|
|
enable_irq(wm831x_ts->data_irq);
|
|
dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n");
|
|
} else {
|
|
enable_irq(wm831x_ts->pd_irq);
|
|
dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n");
|
|
}
|
|
}
|
|
|
|
static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data)
|
|
{
|
|
struct wm831x_ts *wm831x_ts = irq_data;
|
|
struct wm831x *wm831x = wm831x_ts->wm831x;
|
|
static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE };
|
|
u16 data[3];
|
|
int count;
|
|
int i, ret;
|
|
|
|
if (wm831x_ts->pressure)
|
|
count = 3;
|
|
else
|
|
count = 2;
|
|
|
|
wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
|
|
WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
|
|
|
|
ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count,
|
|
data);
|
|
if (ret != 0) {
|
|
dev_err(wm831x->dev, "Failed to read touch data: %d\n",
|
|
ret);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
/*
|
|
* We get a pen down reading on every reading, report pen up if any
|
|
* individual reading does so.
|
|
*/
|
|
wm831x_ts->pen_down = true;
|
|
for (i = 0; i < count; i++) {
|
|
if (!(data[i] & WM831X_TCH_PD)) {
|
|
wm831x_ts->pen_down = false;
|
|
continue;
|
|
}
|
|
input_report_abs(wm831x_ts->input_dev, data_types[i],
|
|
data[i] & WM831X_TCH_DATA_MASK);
|
|
}
|
|
|
|
if (!wm831x_ts->pen_down) {
|
|
/* Switch from data to pen down */
|
|
dev_dbg(wm831x->dev, "IRQ DATA->PD\n");
|
|
|
|
disable_irq_nosync(wm831x_ts->data_irq);
|
|
|
|
/* Don't need data any more */
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
|
|
WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
|
|
WM831X_TCH_Z_ENA, 0);
|
|
|
|
/* Flush any final samples that arrived while reading */
|
|
wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
|
|
WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
|
|
|
|
wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data);
|
|
|
|
if (wm831x_ts->pressure)
|
|
input_report_abs(wm831x_ts->input_dev,
|
|
ABS_PRESSURE, 0);
|
|
|
|
input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0);
|
|
|
|
schedule_work(&wm831x_ts->pd_data_work);
|
|
} else {
|
|
input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1);
|
|
}
|
|
|
|
input_sync(wm831x_ts->input_dev);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data)
|
|
{
|
|
struct wm831x_ts *wm831x_ts = irq_data;
|
|
struct wm831x *wm831x = wm831x_ts->wm831x;
|
|
int ena = 0;
|
|
|
|
if (wm831x_ts->pen_down)
|
|
return IRQ_HANDLED;
|
|
|
|
disable_irq_nosync(wm831x_ts->pd_irq);
|
|
|
|
/* Start collecting data */
|
|
if (wm831x_ts->pressure)
|
|
ena |= WM831X_TCH_Z_ENA;
|
|
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
|
|
WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA,
|
|
WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | ena);
|
|
|
|
wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
|
|
WM831X_TCHPD_EINT, WM831X_TCHPD_EINT);
|
|
|
|
wm831x_ts->pen_down = true;
|
|
|
|
/* Switch from pen down to data */
|
|
dev_dbg(wm831x->dev, "IRQ PD->DATA\n");
|
|
schedule_work(&wm831x_ts->pd_data_work);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int wm831x_ts_input_open(struct input_dev *idev)
|
|
{
|
|
struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
|
|
struct wm831x *wm831x = wm831x_ts->wm831x;
|
|
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
|
|
WM831X_TCH_ENA | WM831X_TCH_CVT_ENA |
|
|
WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
|
|
WM831X_TCH_Z_ENA, WM831X_TCH_ENA);
|
|
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
|
|
WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void wm831x_ts_input_close(struct input_dev *idev)
|
|
{
|
|
struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
|
|
struct wm831x *wm831x = wm831x_ts->wm831x;
|
|
|
|
/* Shut the controller down, disabling all other functionality too */
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
|
|
WM831X_TCH_ENA | WM831X_TCH_X_ENA |
|
|
WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, 0);
|
|
|
|
/* Make sure any pending IRQs are done, the above will prevent
|
|
* new ones firing.
|
|
*/
|
|
synchronize_irq(wm831x_ts->data_irq);
|
|
synchronize_irq(wm831x_ts->pd_irq);
|
|
|
|
/* Make sure the IRQ completion work is quiesced */
|
|
flush_work(&wm831x_ts->pd_data_work);
|
|
|
|
/* If we ended up with the pen down then make sure we revert back
|
|
* to pen detection state for the next time we start up.
|
|
*/
|
|
if (wm831x_ts->pen_down) {
|
|
disable_irq(wm831x_ts->data_irq);
|
|
enable_irq(wm831x_ts->pd_irq);
|
|
wm831x_ts->pen_down = false;
|
|
}
|
|
}
|
|
|
|
static int wm831x_ts_probe(struct platform_device *pdev)
|
|
{
|
|
struct wm831x_ts *wm831x_ts;
|
|
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
|
|
struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent);
|
|
struct wm831x_touch_pdata *pdata = NULL;
|
|
struct input_dev *input_dev;
|
|
int error, irqf;
|
|
|
|
if (core_pdata)
|
|
pdata = core_pdata->touch;
|
|
|
|
wm831x_ts = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ts),
|
|
GFP_KERNEL);
|
|
input_dev = devm_input_allocate_device(&pdev->dev);
|
|
if (!wm831x_ts || !input_dev) {
|
|
error = -ENOMEM;
|
|
goto err_alloc;
|
|
}
|
|
|
|
wm831x_ts->wm831x = wm831x;
|
|
wm831x_ts->input_dev = input_dev;
|
|
INIT_WORK(&wm831x_ts->pd_data_work, wm831x_pd_data_work);
|
|
|
|
/*
|
|
* If we have a direct IRQ use it, otherwise use the interrupt
|
|
* from the WM831x IRQ controller.
|
|
*/
|
|
wm831x_ts->data_irq = wm831x_irq(wm831x,
|
|
platform_get_irq_byname(pdev,
|
|
"TCHDATA"));
|
|
if (pdata && pdata->data_irq)
|
|
wm831x_ts->data_irq = pdata->data_irq;
|
|
|
|
wm831x_ts->pd_irq = wm831x_irq(wm831x,
|
|
platform_get_irq_byname(pdev, "TCHPD"));
|
|
if (pdata && pdata->pd_irq)
|
|
wm831x_ts->pd_irq = pdata->pd_irq;
|
|
|
|
if (pdata)
|
|
wm831x_ts->pressure = pdata->pressure;
|
|
else
|
|
wm831x_ts->pressure = true;
|
|
|
|
/* Five wire touchscreens can't report pressure */
|
|
if (pdata && pdata->fivewire) {
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
|
|
WM831X_TCH_5WIRE, WM831X_TCH_5WIRE);
|
|
|
|
/* Pressure measurements are not possible for five wire mode */
|
|
WARN_ON(pdata->pressure && pdata->fivewire);
|
|
wm831x_ts->pressure = false;
|
|
} else {
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
|
|
WM831X_TCH_5WIRE, 0);
|
|
}
|
|
|
|
if (pdata) {
|
|
switch (pdata->isel) {
|
|
default:
|
|
dev_err(&pdev->dev, "Unsupported ISEL setting: %d\n",
|
|
pdata->isel);
|
|
/* Fall through */
|
|
case 200:
|
|
case 0:
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
|
|
WM831X_TCH_ISEL, 0);
|
|
break;
|
|
case 400:
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
|
|
WM831X_TCH_ISEL, WM831X_TCH_ISEL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
|
|
WM831X_TCH_PDONLY, 0);
|
|
|
|
/* Default to 96 samples/sec */
|
|
wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
|
|
WM831X_TCH_RATE_MASK, 6);
|
|
|
|
if (pdata && pdata->data_irqf)
|
|
irqf = pdata->data_irqf;
|
|
else
|
|
irqf = IRQF_TRIGGER_HIGH;
|
|
|
|
error = request_threaded_irq(wm831x_ts->data_irq,
|
|
NULL, wm831x_ts_data_irq,
|
|
irqf | IRQF_ONESHOT,
|
|
"Touchscreen data", wm831x_ts);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "Failed to request data IRQ %d: %d\n",
|
|
wm831x_ts->data_irq, error);
|
|
goto err_alloc;
|
|
}
|
|
disable_irq(wm831x_ts->data_irq);
|
|
|
|
if (pdata && pdata->pd_irqf)
|
|
irqf = pdata->pd_irqf;
|
|
else
|
|
irqf = IRQF_TRIGGER_HIGH;
|
|
|
|
error = request_threaded_irq(wm831x_ts->pd_irq,
|
|
NULL, wm831x_ts_pen_down_irq,
|
|
irqf | IRQF_ONESHOT,
|
|
"Touchscreen pen down", wm831x_ts);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "Failed to request pen down IRQ %d: %d\n",
|
|
wm831x_ts->pd_irq, error);
|
|
goto err_data_irq;
|
|
}
|
|
|
|
/* set up touch configuration */
|
|
input_dev->name = "WM831x touchscreen";
|
|
input_dev->phys = "wm831x";
|
|
input_dev->open = wm831x_ts_input_open;
|
|
input_dev->close = wm831x_ts_input_close;
|
|
|
|
__set_bit(EV_ABS, input_dev->evbit);
|
|
__set_bit(EV_KEY, input_dev->evbit);
|
|
__set_bit(BTN_TOUCH, input_dev->keybit);
|
|
|
|
input_set_abs_params(input_dev, ABS_X, 0, 4095, 5, 0);
|
|
input_set_abs_params(input_dev, ABS_Y, 0, 4095, 5, 0);
|
|
if (wm831x_ts->pressure)
|
|
input_set_abs_params(input_dev, ABS_PRESSURE, 0, 4095, 5, 0);
|
|
|
|
input_set_drvdata(input_dev, wm831x_ts);
|
|
input_dev->dev.parent = &pdev->dev;
|
|
|
|
error = input_register_device(input_dev);
|
|
if (error)
|
|
goto err_pd_irq;
|
|
|
|
platform_set_drvdata(pdev, wm831x_ts);
|
|
return 0;
|
|
|
|
err_pd_irq:
|
|
free_irq(wm831x_ts->pd_irq, wm831x_ts);
|
|
err_data_irq:
|
|
free_irq(wm831x_ts->data_irq, wm831x_ts);
|
|
err_alloc:
|
|
|
|
return error;
|
|
}
|
|
|
|
static int wm831x_ts_remove(struct platform_device *pdev)
|
|
{
|
|
struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev);
|
|
|
|
free_irq(wm831x_ts->pd_irq, wm831x_ts);
|
|
free_irq(wm831x_ts->data_irq, wm831x_ts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver wm831x_ts_driver = {
|
|
.driver = {
|
|
.name = "wm831x-touch",
|
|
},
|
|
.probe = wm831x_ts_probe,
|
|
.remove = wm831x_ts_remove,
|
|
};
|
|
module_platform_driver(wm831x_ts_driver);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
|
|
MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:wm831x-touch");
|