Skip to content

Commit

Permalink
input: PCAP2 based touchscreen driver
Browse files Browse the repository at this point in the history 
Touchscreen driver for the PCAP2 multi function device used in
Motorola EZX smartphones.

Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
  • Loading branch information
Daniel Ribeiro authored and Samuel Ortiz committed Sep 17, 2009
1 parent e397e7e commit 0387e10
Show file tree
Hide file tree
Showing 3 changed files with 281 additions and 0 deletions.
9 changes: 9 additions & 0 deletions drivers/input/touchscreen/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -510,4 +510,13 @@ config TOUCHSCREEN_W90X900
To compile this driver as a module, choose M here: the
module will be called w90p910_ts.

config TOUCHSCREEN_PCAP
tristate "Motorola PCAP touchscreen"
depends on EZX_PCAP
help
Say Y here if you have a Motorola EZX telephone and
want to enable support for the built-in touchscreen.

To compile this driver as a module, choose M here: the
module will be called pcap_ts.
endif
1 change: 1 addition & 0 deletions drivers/input/touchscreen/Makefile
View file
Original file line number Diff line number Diff line change
Expand Up @@ -40,3 +40,4 @@ 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
obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
271 changes: 271 additions & 0 deletions drivers/input/touchscreen/pcap_ts.c
View file
Original file line number Diff line number Diff line change
@@ -0,0 +1,271 @@
/*
* Driver for Motorola PCAP2 touchscreen as found in the EZX phone platform.
*
* Copyright (C) 2006 Harald Welte <laforge@openezx.org>
* Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.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/init.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/pm.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/mfd/ezx-pcap.h>

struct pcap_ts {
struct pcap_chip *pcap;
struct input_dev *input;
struct delayed_work work;
u16 x, y;
u16 pressure;
u8 read_state;
};

#define SAMPLE_DELAY 20 /* msecs */

#define X_AXIS_MIN 0
#define X_AXIS_MAX 1023
#define Y_AXIS_MAX X_AXIS_MAX
#define Y_AXIS_MIN X_AXIS_MIN
#define PRESSURE_MAX X_AXIS_MAX
#define PRESSURE_MIN X_AXIS_MIN

static void pcap_ts_read_xy(void *data, u16 res[2])
{
struct pcap_ts *pcap_ts = data;

switch (pcap_ts->read_state) {
case PCAP_ADC_TS_M_PRESSURE:
/* pressure reading is unreliable */
if (res[0] > PRESSURE_MIN && res[0] < PRESSURE_MAX)
pcap_ts->pressure = res[0];
pcap_ts->read_state = PCAP_ADC_TS_M_XY;
schedule_delayed_work(&pcap_ts->work, 0);
break;
case PCAP_ADC_TS_M_XY:
pcap_ts->y = res[0];
pcap_ts->x = res[1];
if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX ||
pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) {
/* pen has been released */
input_report_abs(pcap_ts->input, ABS_PRESSURE, 0);
input_report_key(pcap_ts->input, BTN_TOUCH, 0);

pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
schedule_delayed_work(&pcap_ts->work, 0);
} else {
/* pen is touching the screen */
input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x);
input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y);
input_report_key(pcap_ts->input, BTN_TOUCH, 1);
input_report_abs(pcap_ts->input, ABS_PRESSURE,
pcap_ts->pressure);

/* switch back to pressure read mode */
pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
schedule_delayed_work(&pcap_ts->work,
msecs_to_jiffies(SAMPLE_DELAY));
}
input_sync(pcap_ts->input);
break;
default:
dev_warn(&pcap_ts->input->dev,
"pcap_ts: Warning, unhandled read_state %d\n",
pcap_ts->read_state);
break;
}
}

static void pcap_ts_work(struct work_struct *work)
{
struct delayed_work *dw = container_of(work, struct delayed_work, work);
struct pcap_ts *pcap_ts = container_of(dw, struct pcap_ts, work);
u8 ch[2];

pcap_set_ts_bits(pcap_ts->pcap,
pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);

if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY)
return;

/* start adc conversion */
ch[0] = PCAP_ADC_CH_TS_X1;
ch[1] = PCAP_ADC_CH_TS_Y1;
pcap_adc_async(pcap_ts->pcap, PCAP_ADC_BANK_1, 0, ch,
pcap_ts_read_xy, pcap_ts);
}

static irqreturn_t pcap_ts_event_touch(int pirq, void *data)
{
struct pcap_ts *pcap_ts = data;

if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) {
pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
schedule_delayed_work(&pcap_ts->work, 0);
}
return IRQ_HANDLED;
}

static int pcap_ts_open(struct input_dev *dev)
{
struct pcap_ts *pcap_ts = input_get_drvdata(dev);

pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
schedule_delayed_work(&pcap_ts->work, 0);

return 0;
}

static void pcap_ts_close(struct input_dev *dev)
{
struct pcap_ts *pcap_ts = input_get_drvdata(dev);

cancel_delayed_work_sync(&pcap_ts->work);

pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
pcap_set_ts_bits(pcap_ts->pcap,
pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
}

static int __devinit pcap_ts_probe(struct platform_device *pdev)
{
struct input_dev *input_dev;
struct pcap_ts *pcap_ts;
int err = -ENOMEM;

pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL);
if (!pcap_ts)
return err;

pcap_ts->pcap = dev_get_drvdata(pdev->dev.parent);
platform_set_drvdata(pdev, pcap_ts);

input_dev = input_allocate_device();
if (!input_dev)
goto fail;

INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work);

pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
pcap_set_ts_bits(pcap_ts->pcap,
pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);

pcap_ts->input = input_dev;
input_set_drvdata(input_dev, pcap_ts);

input_dev->name = "pcap-touchscreen";
input_dev->phys = "pcap_ts/input0";
input_dev->id.bustype = BUS_HOST;
input_dev->id.vendor = 0x0001;
input_dev->id.product = 0x0002;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &pdev->dev;
input_dev->open = pcap_ts_open;
input_dev->close = pcap_ts_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, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,
PRESSURE_MAX, 0, 0);

err = input_register_device(pcap_ts->input);
if (err)
goto fail_allocate;

err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS),
pcap_ts_event_touch, 0, "Touch Screen", pcap_ts);
if (err)
goto fail_register;

return 0;

fail_register:
input_unregister_device(input_dev);
goto fail;
fail_allocate:
input_free_device(input_dev);
fail:
kfree(pcap_ts);

return err;
}

static int __devexit pcap_ts_remove(struct platform_device *pdev)
{
struct pcap_ts *pcap_ts = platform_get_drvdata(pdev);

free_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), pcap_ts);
cancel_delayed_work_sync(&pcap_ts->work);

input_unregister_device(pcap_ts->input);

kfree(pcap_ts);

return 0;
}

#ifdef CONFIG_PM
static int pcap_ts_suspend(struct device *dev)
{
struct pcap_ts *pcap_ts = dev_get_drvdata(dev);

pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR);
return 0;
}

static int pcap_ts_resume(struct device *dev)
{
struct pcap_ts *pcap_ts = dev_get_drvdata(dev);

pcap_set_ts_bits(pcap_ts->pcap,
pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
return 0;
}

static struct dev_pm_ops pcap_ts_pm_ops = {
.suspend = pcap_ts_suspend,
.resume = pcap_ts_resume,
};
#define PCAP_TS_PM_OPS (&pcap_ts_pm_ops)
#else
#define PCAP_TS_PM_OPS NULL
#endif

static struct platform_driver pcap_ts_driver = {
.probe = pcap_ts_probe,
.remove = __devexit_p(pcap_ts_remove),
.driver = {
.name = "pcap-ts",
.owner = THIS_MODULE,
.pm = PCAP_TS_PM_OPS,
},
};

static int __init pcap_ts_init(void)
{
return platform_driver_register(&pcap_ts_driver);
}

static void __exit pcap_ts_exit(void)
{
platform_driver_unregister(&pcap_ts_driver);
}

module_init(pcap_ts_init);
module_exit(pcap_ts_exit);

MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcap_ts");

0 comments on commit 0387e10

Please sign in to comment.