linux-stable/drivers/input/touchscreen/tsc40.c
Rolf Eike Beer 32ed1911fc Input: tsc40 - remove wrong announcement of pressure support
The tsc40 driver announces it supports the pressure event, but will never
send one. The announcement will cause tslib to wait for such events and
sending all touch events with a pressure of 0. Removing the announcement
will make tslib fall back to emulating the pressure on touch events so
everything works as expected.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2012-10-30 23:40:07 -07:00

173 lines
3.6 KiB
C

/*
* TSC-40 serial touchscreen driver. It should be compatible with
* TSC-10 and 25.
*
* Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
* License: GPLv2 as published by the FSF.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>
#define PACKET_LENGTH 5
struct tsc_ser {
struct input_dev *dev;
struct serio *serio;
u32 idx;
unsigned char data[PACKET_LENGTH];
char phys[32];
};
static void tsc_process_data(struct tsc_ser *ptsc)
{
struct input_dev *dev = ptsc->dev;
u8 *data = ptsc->data;
u32 x;
u32 y;
x = ((data[1] & 0x03) << 8) | data[2];
y = ((data[3] & 0x03) << 8) | data[4];
input_report_abs(dev, ABS_X, x);
input_report_abs(dev, ABS_Y, y);
input_report_key(dev, BTN_TOUCH, 1);
input_sync(dev);
}
static irqreturn_t tsc_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct tsc_ser *ptsc = serio_get_drvdata(serio);
struct input_dev *dev = ptsc->dev;
ptsc->data[ptsc->idx] = data;
switch (ptsc->idx++) {
case 0:
if (unlikely((data & 0x3e) != 0x10)) {
dev_dbg(&serio->dev,
"unsynchronized packet start (0x%02x)\n", data);
ptsc->idx = 0;
} else if (!(data & 0x01)) {
input_report_key(dev, BTN_TOUCH, 0);
input_sync(dev);
ptsc->idx = 0;
}
break;
case 1:
case 3:
if (unlikely(data & 0xfc)) {
dev_dbg(&serio->dev,
"unsynchronized data 0x%02x at offset %d\n",
data, ptsc->idx - 1);
ptsc->idx = 0;
}
break;
case 4:
tsc_process_data(ptsc);
ptsc->idx = 0;
break;
}
return IRQ_HANDLED;
}
static int tsc_connect(struct serio *serio, struct serio_driver *drv)
{
struct tsc_ser *ptsc;
struct input_dev *input_dev;
int error;
ptsc = kzalloc(sizeof(struct tsc_ser), GFP_KERNEL);
input_dev = input_allocate_device();
if (!ptsc || !input_dev) {
error = -ENOMEM;
goto fail1;
}
ptsc->serio = serio;
ptsc->dev = input_dev;
snprintf(ptsc->phys, sizeof(ptsc->phys), "%s/input0", serio->phys);
input_dev->name = "TSC-10/25/40 Serial TouchScreen";
input_dev->phys = ptsc->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_TSC40;
input_dev->id.product = 40;
input_dev->id.version = 0x0001;
input_dev->dev.parent = &serio->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
__set_bit(BTN_TOUCH, input_dev->keybit);
input_set_abs_params(ptsc->dev, ABS_X, 0, 0x3ff, 0, 0);
input_set_abs_params(ptsc->dev, ABS_Y, 0, 0x3ff, 0, 0);
serio_set_drvdata(serio, ptsc);
error = serio_open(serio, drv);
if (error)
goto fail2;
error = input_register_device(ptsc->dev);
if (error)
goto fail3;
return 0;
fail3:
serio_close(serio);
fail2:
serio_set_drvdata(serio, NULL);
fail1:
input_free_device(input_dev);
kfree(ptsc);
return error;
}
static void tsc_disconnect(struct serio *serio)
{
struct tsc_ser *ptsc = serio_get_drvdata(serio);
serio_close(serio);
input_unregister_device(ptsc->dev);
kfree(ptsc);
serio_set_drvdata(serio, NULL);
}
static struct serio_device_id tsc_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_TSC40,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, tsc_serio_ids);
#define DRIVER_DESC "TSC-10/25/40 serial touchscreen driver"
static struct serio_driver tsc_drv = {
.driver = {
.name = "tsc40",
},
.description = DRIVER_DESC,
.id_table = tsc_serio_ids,
.interrupt = tsc_interrupt,
.connect = tsc_connect,
.disconnect = tsc_disconnect,
};
module_serio_driver(tsc_drv);
MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");