kernel_optimize_test/drivers/input/touchscreen/mc13783_ts.c
Michael Thalmeier 1039d762d0 mfd: Add pdata to set mc13783-ts conversion delay
MC13783 can be programmed to wait some clock cycles between the
touchscreen polarization and the resistance conversion. This is
needed to adjust for touchscreens with high capacitance between
plates.

Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-03-06 18:46:30 +01:00

269 lines
7.0 KiB
C

/*
* Driver for the Freescale Semiconductor MC13783 touchscreen.
*
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2009 Sascha Hauer, Pengutronix
*
* Initial development of this code was funded by
* Phytec Messtechnik GmbH, http://www.phytec.de/
*
* 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/platform_device.h>
#include <linux/mfd/mc13783.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#define MC13783_TS_NAME "mc13783-ts"
#define DEFAULT_SAMPLE_TOLERANCE 300
static unsigned int sample_tolerance = DEFAULT_SAMPLE_TOLERANCE;
module_param(sample_tolerance, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(sample_tolerance,
"If the minimal and maximal value read out for one axis (out "
"of three) differ by this value (default: "
__stringify(DEFAULT_SAMPLE_TOLERANCE) ") or more, the reading "
"is supposed to be wrong and is discarded. Set to 0 to "
"disable this check.");
struct mc13783_ts_priv {
struct input_dev *idev;
struct mc13xxx *mc13xxx;
struct delayed_work work;
struct workqueue_struct *workq;
unsigned int sample[4];
struct mc13xxx_ts_platform_data *touch;
};
static irqreturn_t mc13783_ts_handler(int irq, void *data)
{
struct mc13783_ts_priv *priv = data;
mc13xxx_irq_ack(priv->mc13xxx, irq);
/*
* Kick off reading coordinates. Note that if work happens already
* be queued for future execution (it rearms itself) it will not
* be rescheduled for immediate execution here. However the rearm
* delay is HZ / 50 which is acceptable.
*/
queue_delayed_work(priv->workq, &priv->work, 0);
return IRQ_HANDLED;
}
#define sort3(a0, a1, a2) ({ \
if (a0 > a1) \
swap(a0, a1); \
if (a1 > a2) \
swap(a1, a2); \
if (a0 > a1) \
swap(a0, a1); \
})
static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
{
struct input_dev *idev = priv->idev;
int x0, x1, x2, y0, y1, y2;
int cr0, cr1;
/*
* the values are 10-bit wide only, but the two least significant
* bits are for future 12 bit use and reading yields 0
*/
x0 = priv->sample[0] & 0xfff;
x1 = priv->sample[1] & 0xfff;
x2 = priv->sample[2] & 0xfff;
y0 = priv->sample[3] & 0xfff;
y1 = (priv->sample[0] >> 12) & 0xfff;
y2 = (priv->sample[1] >> 12) & 0xfff;
cr0 = (priv->sample[2] >> 12) & 0xfff;
cr1 = (priv->sample[3] >> 12) & 0xfff;
dev_dbg(&idev->dev,
"x: (% 4d,% 4d,% 4d) y: (% 4d, % 4d,% 4d) cr: (% 4d, % 4d)\n",
x0, x1, x2, y0, y1, y2, cr0, cr1);
sort3(x0, x1, x2);
sort3(y0, y1, y2);
cr0 = (cr0 + cr1) / 2;
if (!cr0 || !sample_tolerance ||
(x2 - x0 < sample_tolerance &&
y2 - y0 < sample_tolerance)) {
/* report the median coordinate and average pressure */
if (cr0) {
input_report_abs(idev, ABS_X, x1);
input_report_abs(idev, ABS_Y, y1);
dev_dbg(&idev->dev, "report (%d, %d, %d)\n",
x1, y1, 0x1000 - cr0);
queue_delayed_work(priv->workq, &priv->work, HZ / 50);
} else
dev_dbg(&idev->dev, "report release\n");
input_report_abs(idev, ABS_PRESSURE,
cr0 ? 0x1000 - cr0 : cr0);
input_report_key(idev, BTN_TOUCH, cr0);
input_sync(idev);
} else
dev_dbg(&idev->dev, "discard event\n");
}
static void mc13783_ts_work(struct work_struct *work)
{
struct mc13783_ts_priv *priv =
container_of(work, struct mc13783_ts_priv, work.work);
unsigned int mode = MC13XXX_ADC_MODE_TS;
unsigned int channel = 12;
if (mc13xxx_adc_do_conversion(priv->mc13xxx,
mode, channel,
priv->touch->ato, priv->touch->atox,
priv->sample) == 0)
mc13783_ts_report_sample(priv);
}
static int mc13783_ts_open(struct input_dev *dev)
{
struct mc13783_ts_priv *priv = input_get_drvdata(dev);
int ret;
mc13xxx_lock(priv->mc13xxx);
mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TS);
ret = mc13xxx_irq_request(priv->mc13xxx, MC13XXX_IRQ_TS,
mc13783_ts_handler, MC13783_TS_NAME, priv);
if (ret)
goto out;
ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0);
if (ret)
mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
out:
mc13xxx_unlock(priv->mc13xxx);
return ret;
}
static void mc13783_ts_close(struct input_dev *dev)
{
struct mc13783_ts_priv *priv = input_get_drvdata(dev);
mc13xxx_lock(priv->mc13xxx);
mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
MC13XXX_ADC0_TSMOD_MASK, 0);
mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
mc13xxx_unlock(priv->mc13xxx);
cancel_delayed_work_sync(&priv->work);
}
static int __init mc13783_ts_probe(struct platform_device *pdev)
{
struct mc13783_ts_priv *priv;
struct input_dev *idev;
int ret = -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
idev = input_allocate_device();
if (!priv || !idev)
goto err_free_mem;
INIT_DELAYED_WORK(&priv->work, mc13783_ts_work);
priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
priv->idev = idev;
priv->touch = dev_get_platdata(&pdev->dev);
if (!priv->touch) {
dev_err(&pdev->dev, "missing platform data\n");
ret = -ENODEV;
goto err_free_mem;
}
/*
* We need separate workqueue because mc13783_adc_do_conversion
* uses keventd and thus would deadlock.
*/
priv->workq = create_singlethread_workqueue("mc13783_ts");
if (!priv->workq)
goto err_free_mem;
idev->name = MC13783_TS_NAME;
idev->dev.parent = &pdev->dev;
idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0);
input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0);
input_set_abs_params(idev, ABS_PRESSURE, 0, 0xfff, 0, 0);
idev->open = mc13783_ts_open;
idev->close = mc13783_ts_close;
input_set_drvdata(idev, priv);
ret = input_register_device(priv->idev);
if (ret) {
dev_err(&pdev->dev,
"register input device failed with %d\n", ret);
goto err_destroy_wq;
}
platform_set_drvdata(pdev, priv);
return 0;
err_destroy_wq:
destroy_workqueue(priv->workq);
err_free_mem:
input_free_device(idev);
kfree(priv);
return ret;
}
static int __devexit mc13783_ts_remove(struct platform_device *pdev)
{
struct mc13783_ts_priv *priv = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
destroy_workqueue(priv->workq);
input_unregister_device(priv->idev);
kfree(priv);
return 0;
}
static struct platform_driver mc13783_ts_driver = {
.remove = __devexit_p(mc13783_ts_remove),
.driver = {
.owner = THIS_MODULE,
.name = MC13783_TS_NAME,
},
};
static int __init mc13783_ts_init(void)
{
return platform_driver_probe(&mc13783_ts_driver, &mc13783_ts_probe);
}
module_init(mc13783_ts_init);
static void __exit mc13783_ts_exit(void)
{
platform_driver_unregister(&mc13783_ts_driver);
}
module_exit(mc13783_ts_exit);
MODULE_DESCRIPTION("MC13783 input touchscreen driver");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" MC13783_TS_NAME);