mirror of https://gitee.com/openkylin/linux.git
387 lines
8.6 KiB
C
387 lines
8.6 KiB
C
/*
|
|
* Touchscreen driver for Dialog Semiconductor DA9034
|
|
*
|
|
* Copyright (C) 2006-2008 Marvell International Ltd.
|
|
* Fengwei Yin <fengwei.yin@marvell.com>
|
|
* Bin Yang <bin.yang@marvell.com>
|
|
* Eric Miao <eric.miao@marvell.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/input.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/mfd/da903x.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define DA9034_MANUAL_CTRL 0x50
|
|
#define DA9034_LDO_ADC_EN (1 << 4)
|
|
|
|
#define DA9034_AUTO_CTRL1 0x51
|
|
|
|
#define DA9034_AUTO_CTRL2 0x52
|
|
#define DA9034_AUTO_TSI_EN (1 << 3)
|
|
#define DA9034_PEN_DETECT (1 << 4)
|
|
|
|
#define DA9034_TSI_CTRL1 0x53
|
|
#define DA9034_TSI_CTRL2 0x54
|
|
#define DA9034_TSI_X_MSB 0x6c
|
|
#define DA9034_TSI_Y_MSB 0x6d
|
|
#define DA9034_TSI_XY_LSB 0x6e
|
|
|
|
enum {
|
|
STATE_IDLE, /* wait for pendown */
|
|
STATE_BUSY, /* TSI busy sampling */
|
|
STATE_STOP, /* sample available */
|
|
STATE_WAIT, /* Wait to start next sample */
|
|
};
|
|
|
|
enum {
|
|
EVENT_PEN_DOWN,
|
|
EVENT_PEN_UP,
|
|
EVENT_TSI_READY,
|
|
EVENT_TIMEDOUT,
|
|
};
|
|
|
|
struct da9034_touch {
|
|
struct device *da9034_dev;
|
|
struct input_dev *input_dev;
|
|
|
|
struct delayed_work tsi_work;
|
|
struct notifier_block notifier;
|
|
|
|
int state;
|
|
|
|
int interval_ms;
|
|
int x_inverted;
|
|
int y_inverted;
|
|
|
|
int last_x;
|
|
int last_y;
|
|
};
|
|
|
|
static inline int is_pen_down(struct da9034_touch *touch)
|
|
{
|
|
return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN);
|
|
}
|
|
|
|
static inline int detect_pen_down(struct da9034_touch *touch, int on)
|
|
{
|
|
if (on)
|
|
return da903x_set_bits(touch->da9034_dev,
|
|
DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
|
|
else
|
|
return da903x_clr_bits(touch->da9034_dev,
|
|
DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
|
|
}
|
|
|
|
static int read_tsi(struct da9034_touch *touch)
|
|
{
|
|
uint8_t _x, _y, _v;
|
|
int ret;
|
|
|
|
ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v);
|
|
if (ret)
|
|
return ret;
|
|
|
|
touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3);
|
|
touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int start_tsi(struct da9034_touch *touch)
|
|
{
|
|
return da903x_set_bits(touch->da9034_dev,
|
|
DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
|
|
}
|
|
|
|
static inline int stop_tsi(struct da9034_touch *touch)
|
|
{
|
|
return da903x_clr_bits(touch->da9034_dev,
|
|
DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
|
|
}
|
|
|
|
static inline void report_pen_down(struct da9034_touch *touch)
|
|
{
|
|
int x = touch->last_x;
|
|
int y = touch->last_y;
|
|
|
|
x &= 0xfff;
|
|
if (touch->x_inverted)
|
|
x = 1024 - x;
|
|
y &= 0xfff;
|
|
if (touch->y_inverted)
|
|
y = 1024 - y;
|
|
|
|
input_report_abs(touch->input_dev, ABS_X, x);
|
|
input_report_abs(touch->input_dev, ABS_Y, y);
|
|
input_report_key(touch->input_dev, BTN_TOUCH, 1);
|
|
|
|
input_sync(touch->input_dev);
|
|
}
|
|
|
|
static inline void report_pen_up(struct da9034_touch *touch)
|
|
{
|
|
input_report_key(touch->input_dev, BTN_TOUCH, 0);
|
|
input_sync(touch->input_dev);
|
|
}
|
|
|
|
static void da9034_event_handler(struct da9034_touch *touch, int event)
|
|
{
|
|
int err;
|
|
|
|
switch (touch->state) {
|
|
case STATE_IDLE:
|
|
if (event != EVENT_PEN_DOWN)
|
|
break;
|
|
|
|
/* Enable auto measurement of the TSI, this will
|
|
* automatically disable pen down detection
|
|
*/
|
|
err = start_tsi(touch);
|
|
if (err)
|
|
goto err_reset;
|
|
|
|
touch->state = STATE_BUSY;
|
|
break;
|
|
|
|
case STATE_BUSY:
|
|
if (event != EVENT_TSI_READY)
|
|
break;
|
|
|
|
err = read_tsi(touch);
|
|
if (err)
|
|
goto err_reset;
|
|
|
|
/* Disable auto measurement of the TSI, so that
|
|
* pen down status will be available
|
|
*/
|
|
err = stop_tsi(touch);
|
|
if (err)
|
|
goto err_reset;
|
|
|
|
touch->state = STATE_STOP;
|
|
|
|
/* FIXME: PEN_{UP/DOWN} events are expected to be
|
|
* available by stopping TSI, but this is found not
|
|
* always true, delay and simulate such an event
|
|
* here is more reliable
|
|
*/
|
|
mdelay(1);
|
|
da9034_event_handler(touch,
|
|
is_pen_down(touch) ? EVENT_PEN_DOWN :
|
|
EVENT_PEN_UP);
|
|
break;
|
|
|
|
case STATE_STOP:
|
|
if (event == EVENT_PEN_DOWN) {
|
|
report_pen_down(touch);
|
|
schedule_delayed_work(&touch->tsi_work,
|
|
msecs_to_jiffies(touch->interval_ms));
|
|
touch->state = STATE_WAIT;
|
|
}
|
|
|
|
if (event == EVENT_PEN_UP) {
|
|
report_pen_up(touch);
|
|
touch->state = STATE_IDLE;
|
|
}
|
|
break;
|
|
|
|
case STATE_WAIT:
|
|
if (event != EVENT_TIMEDOUT)
|
|
break;
|
|
|
|
if (is_pen_down(touch)) {
|
|
start_tsi(touch);
|
|
touch->state = STATE_BUSY;
|
|
} else {
|
|
report_pen_up(touch);
|
|
touch->state = STATE_IDLE;
|
|
}
|
|
break;
|
|
}
|
|
return;
|
|
|
|
err_reset:
|
|
touch->state = STATE_IDLE;
|
|
stop_tsi(touch);
|
|
detect_pen_down(touch, 1);
|
|
}
|
|
|
|
static void da9034_tsi_work(struct work_struct *work)
|
|
{
|
|
struct da9034_touch *touch =
|
|
container_of(work, struct da9034_touch, tsi_work.work);
|
|
|
|
da9034_event_handler(touch, EVENT_TIMEDOUT);
|
|
}
|
|
|
|
static int da9034_touch_notifier(struct notifier_block *nb,
|
|
unsigned long event, void *data)
|
|
{
|
|
struct da9034_touch *touch =
|
|
container_of(nb, struct da9034_touch, notifier);
|
|
|
|
if (event & DA9034_EVENT_TSI_READY)
|
|
da9034_event_handler(touch, EVENT_TSI_READY);
|
|
|
|
if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE)
|
|
da9034_event_handler(touch, EVENT_PEN_DOWN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int da9034_touch_open(struct input_dev *dev)
|
|
{
|
|
struct da9034_touch *touch = input_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier,
|
|
DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
|
|
if (ret)
|
|
return -EBUSY;
|
|
|
|
/* Enable ADC LDO */
|
|
ret = da903x_set_bits(touch->da9034_dev,
|
|
DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */
|
|
ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00);
|
|
if (ret)
|
|
return ret;
|
|
|
|
touch->state = STATE_IDLE;
|
|
detect_pen_down(touch, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void da9034_touch_close(struct input_dev *dev)
|
|
{
|
|
struct da9034_touch *touch = input_get_drvdata(dev);
|
|
|
|
da903x_unregister_notifier(touch->da9034_dev, &touch->notifier,
|
|
DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
|
|
|
|
cancel_delayed_work_sync(&touch->tsi_work);
|
|
|
|
touch->state = STATE_IDLE;
|
|
stop_tsi(touch);
|
|
detect_pen_down(touch, 0);
|
|
|
|
/* Disable ADC LDO */
|
|
da903x_clr_bits(touch->da9034_dev,
|
|
DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
|
|
}
|
|
|
|
|
|
static int da9034_touch_probe(struct platform_device *pdev)
|
|
{
|
|
struct da9034_touch_pdata *pdata = dev_get_platdata(&pdev->dev);
|
|
struct da9034_touch *touch;
|
|
struct input_dev *input_dev;
|
|
int ret;
|
|
|
|
touch = kzalloc(sizeof(struct da9034_touch), GFP_KERNEL);
|
|
if (touch == NULL) {
|
|
dev_err(&pdev->dev, "failed to allocate driver data\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
touch->da9034_dev = pdev->dev.parent;
|
|
|
|
if (pdata) {
|
|
touch->interval_ms = pdata->interval_ms;
|
|
touch->x_inverted = pdata->x_inverted;
|
|
touch->y_inverted = pdata->y_inverted;
|
|
} else
|
|
/* fallback into default */
|
|
touch->interval_ms = 10;
|
|
|
|
INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work);
|
|
touch->notifier.notifier_call = da9034_touch_notifier;
|
|
|
|
input_dev = input_allocate_device();
|
|
if (!input_dev) {
|
|
dev_err(&pdev->dev, "failed to allocate input device\n");
|
|
ret = -ENOMEM;
|
|
goto err_free_touch;
|
|
}
|
|
|
|
input_dev->name = pdev->name;
|
|
input_dev->open = da9034_touch_open;
|
|
input_dev->close = da9034_touch_close;
|
|
input_dev->dev.parent = &pdev->dev;
|
|
|
|
__set_bit(EV_ABS, input_dev->evbit);
|
|
__set_bit(ABS_X, input_dev->absbit);
|
|
__set_bit(ABS_Y, input_dev->absbit);
|
|
input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
|
|
input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
|
|
|
|
__set_bit(EV_KEY, input_dev->evbit);
|
|
__set_bit(BTN_TOUCH, input_dev->keybit);
|
|
|
|
touch->input_dev = input_dev;
|
|
input_set_drvdata(input_dev, touch);
|
|
|
|
ret = input_register_device(input_dev);
|
|
if (ret)
|
|
goto err_free_input;
|
|
|
|
platform_set_drvdata(pdev, touch);
|
|
return 0;
|
|
|
|
err_free_input:
|
|
input_free_device(input_dev);
|
|
err_free_touch:
|
|
kfree(touch);
|
|
return ret;
|
|
}
|
|
|
|
static int da9034_touch_remove(struct platform_device *pdev)
|
|
{
|
|
struct da9034_touch *touch = platform_get_drvdata(pdev);
|
|
|
|
input_unregister_device(touch->input_dev);
|
|
kfree(touch);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver da9034_touch_driver = {
|
|
.driver = {
|
|
.name = "da9034-touch",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = da9034_touch_probe,
|
|
.remove = da9034_touch_remove,
|
|
};
|
|
module_platform_driver(da9034_touch_driver);
|
|
|
|
MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034");
|
|
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:da9034-touch");
|