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172 lines
3.6 KiB
172 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL v2");
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