mirror of
https://github.com/torvalds/linux.git
synced 2024-12-07 19:41:31 +00:00
fa68e2777c
Use to_delayed_work() instead of open-coding it. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
259 lines
6.5 KiB
C
259 lines
6.5 KiB
C
/*
|
|
* 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/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.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 = to_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 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 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 const 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 = pcap_ts_remove,
|
|
.driver = {
|
|
.name = "pcap-ts",
|
|
.pm = PCAP_TS_PM_OPS,
|
|
},
|
|
};
|
|
module_platform_driver(pcap_ts_driver);
|
|
|
|
MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
|
|
MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:pcap_ts");
|