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