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/*
* 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");
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