mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 01:00:58 +07:00
Input: add support for touchscreen on W90P910 ARM platform
The touchscreen works in two modes, wait trigger mode and auto-semi mode. The device starts in wait trigger mode and waits until pressure is detected, then device sets WT_INT bit and raises an interrupt. The driver should put the device into auto-semi mode and prepare for reading first X and then Y coordinates. When coordinate data is ready the driver sets ADC_INT bit and raises interrupt again. [dtor@mail.ru: various cleanups] Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Wan ZongShun
Dmitry Torokhov
parent
4894e4aca8
commit
7e3f73754e
@ -490,4 +490,12 @@ config TOUCHSCREEN_TSC2007
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called tsc2007.
|
||||
|
||||
config TOUCHSCREEN_W90X900
|
||||
tristate "W90P910 touchscreen driver"
|
||||
help
|
||||
Say Y here if you have a W90P910 based touchscreen.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called w90p910_ts.
|
||||
|
||||
endif
|
||||
|
||||
@ -39,3 +39,4 @@ wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o
|
||||
obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL) += atmel-wm97xx.o
|
||||
obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
|
||||
obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
|
||||
obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
|
||||
|
||||
350
drivers/input/touchscreen/w90p910_ts.c
Normal file
350
drivers/input/touchscreen/w90p910_ts.c
Normal file
@ -0,0 +1,350 @@
|
||||
/*
|
||||
* Copyright (c) 2008 Nuvoton technology corporation.
|
||||
*
|
||||
* Wan ZongShun <mcuos.com@gmail.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 of the License.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/delay.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/input.h>
|
||||
#include <linux/interrupt.h>
|
||||
|
||||
/* ADC controller bit defines */
|
||||
#define ADC_DELAY 0xf00
|
||||
#define ADC_DOWN 0x01
|
||||
#define ADC_TSC_Y (0x01 << 8)
|
||||
#define ADC_TSC_X (0x00 << 8)
|
||||
#define TSC_FOURWIRE (~(0x03 << 1))
|
||||
#define ADC_CLK_EN (0x01 << 28) /* ADC clock enable */
|
||||
#define ADC_READ_CON (0x01 << 12)
|
||||
#define ADC_CONV (0x01 << 13)
|
||||
#define ADC_SEMIAUTO (0x01 << 14)
|
||||
#define ADC_WAITTRIG (0x03 << 14)
|
||||
#define ADC_RST1 (0x01 << 16)
|
||||
#define ADC_RST0 (0x00 << 16)
|
||||
#define ADC_EN (0x01 << 17)
|
||||
#define ADC_INT (0x01 << 18)
|
||||
#define WT_INT (0x01 << 20)
|
||||
#define ADC_INT_EN (0x01 << 21)
|
||||
#define LVD_INT_EN (0x01 << 22)
|
||||
#define WT_INT_EN (0x01 << 23)
|
||||
#define ADC_DIV (0x04 << 1) /* div = 6 */
|
||||
|
||||
enum ts_state {
|
||||
TS_WAIT_NEW_PACKET, /* We are waiting next touch report */
|
||||
TS_WAIT_X_COORD, /* We are waiting for ADC to report X coord */
|
||||
TS_WAIT_Y_COORD, /* We are waiting for ADC to report Y coord */
|
||||
TS_IDLE, /* Input device is closed, don't do anything */
|
||||
};
|
||||
|
||||
struct w90p910_ts {
|
||||
struct input_dev *input;
|
||||
struct timer_list timer;
|
||||
int irq_num;
|
||||
void __iomem *clocken;
|
||||
void __iomem *ts_reg;
|
||||
spinlock_t lock;
|
||||
enum ts_state state;
|
||||
};
|
||||
|
||||
static void w90p910_report_event(struct w90p910_ts *w90p910_ts, bool down)
|
||||
{
|
||||
struct input_dev *dev = w90p910_ts->input;
|
||||
|
||||
if (down) {
|
||||
input_report_abs(dev, ABS_X,
|
||||
__raw_readl(w90p910_ts->ts_reg + 0x0c));
|
||||
input_report_abs(dev, ABS_Y,
|
||||
__raw_readl(w90p910_ts->ts_reg + 0x10));
|
||||
}
|
||||
|
||||
input_report_key(dev, BTN_TOUCH, down);
|
||||
input_sync(dev);
|
||||
}
|
||||
|
||||
static void w90p910_prepare_x_reading(struct w90p910_ts *w90p910_ts)
|
||||
{
|
||||
unsigned long ctlreg;
|
||||
|
||||
__raw_writel(ADC_TSC_X, w90p910_ts->ts_reg + 0x04);
|
||||
ctlreg = __raw_readl(w90p910_ts->ts_reg);
|
||||
ctlreg &= ~(ADC_WAITTRIG | WT_INT | WT_INT_EN);
|
||||
ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
|
||||
__raw_writel(ctlreg, w90p910_ts->ts_reg);
|
||||
|
||||
w90p910_ts->state = TS_WAIT_X_COORD;
|
||||
}
|
||||
|
||||
static void w90p910_prepare_y_reading(struct w90p910_ts *w90p910_ts)
|
||||
{
|
||||
unsigned long ctlreg;
|
||||
|
||||
__raw_writel(ADC_TSC_Y, w90p910_ts->ts_reg + 0x04);
|
||||
ctlreg = __raw_readl(w90p910_ts->ts_reg);
|
||||
ctlreg &= ~(ADC_WAITTRIG | ADC_INT | WT_INT_EN);
|
||||
ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
|
||||
__raw_writel(ctlreg, w90p910_ts->ts_reg);
|
||||
|
||||
w90p910_ts->state = TS_WAIT_Y_COORD;
|
||||
}
|
||||
|
||||
static void w90p910_prepare_next_packet(struct w90p910_ts *w90p910_ts)
|
||||
{
|
||||
unsigned long ctlreg;
|
||||
|
||||
ctlreg = __raw_readl(w90p910_ts->ts_reg);
|
||||
ctlreg &= ~(ADC_INT | ADC_INT_EN | ADC_SEMIAUTO | ADC_CONV);
|
||||
ctlreg |= ADC_WAITTRIG | WT_INT_EN;
|
||||
__raw_writel(ctlreg, w90p910_ts->ts_reg);
|
||||
|
||||
w90p910_ts->state = TS_WAIT_NEW_PACKET;
|
||||
}
|
||||
|
||||
static irqreturn_t w90p910_ts_interrupt(int irq, void *dev_id)
|
||||
{
|
||||
struct w90p910_ts *w90p910_ts = dev_id;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&w90p910_ts->lock, flags);
|
||||
|
||||
switch (w90p910_ts->state) {
|
||||
case TS_WAIT_NEW_PACKET:
|
||||
/*
|
||||
* The controller only generates interrupts when pen
|
||||
* is down.
|
||||
*/
|
||||
del_timer(&w90p910_ts->timer);
|
||||
w90p910_prepare_x_reading(w90p910_ts);
|
||||
break;
|
||||
|
||||
|
||||
case TS_WAIT_X_COORD:
|
||||
w90p910_prepare_y_reading(w90p910_ts);
|
||||
break;
|
||||
|
||||
case TS_WAIT_Y_COORD:
|
||||
w90p910_report_event(w90p910_ts, true);
|
||||
w90p910_prepare_next_packet(w90p910_ts);
|
||||
mod_timer(&w90p910_ts->timer, jiffies + msecs_to_jiffies(100));
|
||||
break;
|
||||
|
||||
case TS_IDLE:
|
||||
break;
|
||||
}
|
||||
|
||||
spin_unlock_irqrestore(&w90p910_ts->lock, flags);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static void w90p910_check_pen_up(unsigned long data)
|
||||
{
|
||||
struct w90p910_ts *w90p910_ts = (struct w90p910_ts *) data;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&w90p910_ts->lock, flags);
|
||||
|
||||
if (w90p910_ts->state == TS_WAIT_NEW_PACKET &&
|
||||
!(__raw_readl(w90p910_ts->ts_reg + 0x04) & ADC_DOWN)) {
|
||||
|
||||
w90p910_report_event(w90p910_ts, false);
|
||||
}
|
||||
|
||||
spin_unlock_irqrestore(&w90p910_ts->lock, flags);
|
||||
}
|
||||
|
||||
static int w90p910_open(struct input_dev *dev)
|
||||
{
|
||||
struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
|
||||
unsigned long val;
|
||||
|
||||
/* enable the ADC clock */
|
||||
val = __raw_readl(w90p910_ts->clocken);
|
||||
__raw_writel(val | ADC_CLK_EN, w90p910_ts->clocken);
|
||||
|
||||
__raw_writel(ADC_RST1, w90p910_ts->ts_reg);
|
||||
msleep(1);
|
||||
__raw_writel(ADC_RST0, w90p910_ts->ts_reg);
|
||||
msleep(1);
|
||||
|
||||
/* set delay and screen type */
|
||||
val = __raw_readl(w90p910_ts->ts_reg + 0x04);
|
||||
__raw_writel(val & TSC_FOURWIRE, w90p910_ts->ts_reg + 0x04);
|
||||
__raw_writel(ADC_DELAY, w90p910_ts->ts_reg + 0x08);
|
||||
|
||||
w90p910_ts->state = TS_WAIT_NEW_PACKET;
|
||||
wmb();
|
||||
|
||||
/* set trigger mode */
|
||||
val = __raw_readl(w90p910_ts->ts_reg);
|
||||
val |= ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN;
|
||||
__raw_writel(val, w90p910_ts->ts_reg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void w90p910_close(struct input_dev *dev)
|
||||
{
|
||||
struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
|
||||
unsigned long val;
|
||||
|
||||
/* disable trigger mode */
|
||||
|
||||
spin_lock_irq(&w90p910_ts->lock);
|
||||
|
||||
w90p910_ts->state = TS_IDLE;
|
||||
|
||||
val = __raw_readl(w90p910_ts->ts_reg);
|
||||
val &= ~(ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN | ADC_INT_EN);
|
||||
__raw_writel(val, w90p910_ts->ts_reg);
|
||||
|
||||
spin_unlock_irq(&w90p910_ts->lock);
|
||||
|
||||
/* Now that interrupts are shut off we can safely delete timer */
|
||||
del_timer_sync(&w90p910_ts->timer);
|
||||
|
||||
/* stop the ADC clock */
|
||||
val = __raw_readl(w90p910_ts->clocken);
|
||||
__raw_writel(val & ~ADC_CLK_EN, w90p910_ts->clocken);
|
||||
}
|
||||
|
||||
static int __devinit w90x900ts_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct w90p910_ts *w90p910_ts;
|
||||
struct input_dev *input_dev;
|
||||
struct resource *res;
|
||||
int err;
|
||||
|
||||
w90p910_ts = kzalloc(sizeof(struct w90p910_ts), GFP_KERNEL);
|
||||
input_dev = input_allocate_device();
|
||||
if (!w90p910_ts || !input_dev) {
|
||||
err = -ENOMEM;
|
||||
goto fail1;
|
||||
}
|
||||
|
||||
w90p910_ts->input = input_dev;
|
||||
w90p910_ts->state = TS_IDLE;
|
||||
spin_lock_init(&w90p910_ts->lock);
|
||||
setup_timer(&w90p910_ts->timer, w90p910_check_pen_up,
|
||||
(unsigned long)&w90p910_ts);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!res) {
|
||||
err = -ENXIO;
|
||||
goto fail1;
|
||||
}
|
||||
|
||||
if (!request_mem_region(res->start, res->end - res->start + 1,
|
||||
pdev->name)) {
|
||||
err = -EBUSY;
|
||||
goto fail1;
|
||||
}
|
||||
|
||||
w90p910_ts->ts_reg = ioremap(res->start, res->end - res->start + 1);
|
||||
if (!w90p910_ts->ts_reg) {
|
||||
err = -ENOMEM;
|
||||
goto fail2;
|
||||
}
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
||||
if (!res) {
|
||||
err = -ENXIO;
|
||||
goto fail3;
|
||||
}
|
||||
|
||||
w90p910_ts->clocken = (void __iomem *)res->start;
|
||||
|
||||
input_dev->name = "W90P910 TouchScreen";
|
||||
input_dev->phys = "w90p910ts/event0";
|
||||
input_dev->id.bustype = BUS_HOST;
|
||||
input_dev->id.vendor = 0x0005;
|
||||
input_dev->id.product = 0x0001;
|
||||
input_dev->id.version = 0x0100;
|
||||
input_dev->dev.parent = &pdev->dev;
|
||||
input_dev->open = w90p910_open;
|
||||
input_dev->close = w90p910_close;
|
||||
|
||||
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, 0x400, 0, 0);
|
||||
input_set_abs_params(input_dev, ABS_Y, 0, 0x400, 0, 0);
|
||||
|
||||
input_set_drvdata(input_dev, w90p910_ts);
|
||||
|
||||
w90p910_ts->irq_num = platform_get_irq(pdev, 0);
|
||||
if (request_irq(w90p910_ts->irq_num, w90p910_ts_interrupt,
|
||||
IRQF_DISABLED, "w90p910ts", w90p910_ts)) {
|
||||
err = -EBUSY;
|
||||
goto fail3;
|
||||
}
|
||||
|
||||
err = input_register_device(w90p910_ts->input);
|
||||
if (err)
|
||||
goto fail4;
|
||||
|
||||
platform_set_drvdata(pdev, w90p910_ts);
|
||||
|
||||
return 0;
|
||||
|
||||
fail4: free_irq(w90p910_ts->irq_num, w90p910_ts);
|
||||
fail3: iounmap(w90p910_ts->ts_reg);
|
||||
fail2: release_mem_region(res->start, res->end - res->start + 1);
|
||||
fail1: input_free_device(input_dev);
|
||||
kfree(w90p910_ts);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit w90x900ts_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct w90p910_ts *w90p910_ts = platform_get_drvdata(pdev);
|
||||
struct resource *res;
|
||||
|
||||
free_irq(w90p910_ts->irq_num, w90p910_ts);
|
||||
del_timer_sync(&w90p910_ts->timer);
|
||||
iounmap(w90p910_ts->ts_reg);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
release_mem_region(res->start, res->end - res->start + 1);
|
||||
|
||||
input_unregister_device(w90p910_ts->input);
|
||||
kfree(w90p910_ts);
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver w90x900ts_driver = {
|
||||
.probe = w90x900ts_probe,
|
||||
.remove = __devexit_p(w90x900ts_remove),
|
||||
.driver = {
|
||||
.name = "w90x900-ts",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init w90x900ts_init(void)
|
||||
{
|
||||
return platform_driver_register(&w90x900ts_driver);
|
||||
}
|
||||
|
||||
static void __exit w90x900ts_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&w90x900ts_driver);
|
||||
}
|
||||
|
||||
module_init(w90x900ts_init);
|
||||
module_exit(w90x900ts_exit);
|
||||
|
||||
MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
|
||||
MODULE_DESCRIPTION("w90p910 touch screen driver!");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:w90p910-ts");
|
||||
Loading…
Reference in New Issue
Block a user