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214 lines
5.5 KiB
214 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Sahara TouchIT-213 serial touchscreen driver |
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* |
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* Copyright (c) 2007-2008 Claudio Nieder <[email protected]> |
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* |
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* Based on Touchright driver (drivers/input/touchscreen/touchright.c) |
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* Copyright (c) 2006 Rick Koch <[email protected]> |
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* Copyright (c) 2004 Vojtech Pavlik |
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* and Dan Streetman <[email protected]> |
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*/ |
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#include <linux/errno.h> |
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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 DRIVER_DESC "Sahara TouchIT-213 serial touchscreen driver" |
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MODULE_AUTHOR("Claudio Nieder <[email protected]>"); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL"); |
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/* |
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* Definitions & global arrays. |
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*/ |
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/* |
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* Data is received through COM1 at 9600bit/s,8bit,no parity in packets |
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* of 5 byte each. |
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* |
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* +--------+ +--------+ +--------+ +--------+ +--------+ |
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* |1000000p| |0xxxxxxx| |0xxxxxxx| |0yyyyyyy| |0yyyyyyy| |
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* +--------+ +--------+ +--------+ +--------+ +--------+ |
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* MSB LSB MSB LSB |
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* |
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* The value of p is 1 as long as the screen is touched and 0 when |
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* reporting the location where touching stopped, e.g. where the pen was |
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* lifted from the screen. |
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* |
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* When holding the screen in landscape mode as the BIOS text output is |
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* presented, x is the horizontal axis with values growing from left to |
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* right and y is the vertical axis with values growing from top to |
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* bottom. |
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* |
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* When holding the screen in portrait mode with the Sahara logo in its |
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* correct position, x ist the vertical axis with values growing from |
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* top to bottom and y is the horizontal axis with values growing from |
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* right to left. |
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*/ |
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#define T213_FORMAT_TOUCH_BIT 0x01 |
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#define T213_FORMAT_STATUS_BYTE 0x80 |
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#define T213_FORMAT_STATUS_MASK ~T213_FORMAT_TOUCH_BIT |
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/* |
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* On my Sahara Touch-IT 213 I have observed x values from 0 to 0x7f0 |
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* and y values from 0x1d to 0x7e9, so the actual measurement is |
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* probably done with an 11 bit precision. |
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*/ |
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#define T213_MIN_XC 0 |
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#define T213_MAX_XC 0x07ff |
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#define T213_MIN_YC 0 |
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#define T213_MAX_YC 0x07ff |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct touchit213 { |
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struct input_dev *dev; |
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struct serio *serio; |
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int idx; |
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unsigned char csum; |
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unsigned char data[5]; |
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char phys[32]; |
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}; |
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static irqreturn_t touchit213_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct touchit213 *touchit213 = serio_get_drvdata(serio); |
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struct input_dev *dev = touchit213->dev; |
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touchit213->data[touchit213->idx] = data; |
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switch (touchit213->idx++) { |
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case 0: |
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if ((touchit213->data[0] & T213_FORMAT_STATUS_MASK) != |
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T213_FORMAT_STATUS_BYTE) { |
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pr_debug("unsynchronized data: 0x%02x\n", data); |
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touchit213->idx = 0; |
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} |
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break; |
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case 4: |
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touchit213->idx = 0; |
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input_report_abs(dev, ABS_X, |
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(touchit213->data[1] << 7) | touchit213->data[2]); |
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input_report_abs(dev, ABS_Y, |
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(touchit213->data[3] << 7) | touchit213->data[4]); |
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input_report_key(dev, BTN_TOUCH, |
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touchit213->data[0] & T213_FORMAT_TOUCH_BIT); |
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input_sync(dev); |
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break; |
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} |
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return IRQ_HANDLED; |
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} |
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/* |
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* touchit213_disconnect() is the opposite of touchit213_connect() |
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*/ |
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static void touchit213_disconnect(struct serio *serio) |
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{ |
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struct touchit213 *touchit213 = serio_get_drvdata(serio); |
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input_get_device(touchit213->dev); |
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input_unregister_device(touchit213->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(touchit213->dev); |
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kfree(touchit213); |
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} |
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/* |
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* touchit213_connect() is the routine that is called when someone adds a |
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* new serio device that supports the Touchright protocol and registers it as |
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* an input device. |
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*/ |
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static int touchit213_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct touchit213 *touchit213; |
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struct input_dev *input_dev; |
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int err; |
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touchit213 = kzalloc(sizeof(struct touchit213), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!touchit213 || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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touchit213->serio = serio; |
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touchit213->dev = input_dev; |
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snprintf(touchit213->phys, sizeof(touchit213->phys), |
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"%s/input0", serio->phys); |
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input_dev->name = "Sahara Touch-iT213 Serial TouchScreen"; |
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input_dev->phys = touchit213->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_TOUCHIT213; |
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input_dev->id.product = 0; |
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input_dev->id.version = 0x0100; |
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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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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
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input_set_abs_params(touchit213->dev, ABS_X, |
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T213_MIN_XC, T213_MAX_XC, 0, 0); |
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input_set_abs_params(touchit213->dev, ABS_Y, |
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T213_MIN_YC, T213_MAX_YC, 0, 0); |
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serio_set_drvdata(serio, touchit213); |
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err = serio_open(serio, drv); |
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if (err) |
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goto fail2; |
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err = input_register_device(touchit213->dev); |
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if (err) |
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goto fail3; |
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return 0; |
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fail3: serio_close(serio); |
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fail2: serio_set_drvdata(serio, NULL); |
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fail1: input_free_device(input_dev); |
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kfree(touchit213); |
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return err; |
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} |
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/* |
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* The serio driver structure. |
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*/ |
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static const struct serio_device_id touchit213_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_TOUCHIT213, |
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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, touchit213_serio_ids); |
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static struct serio_driver touchit213_drv = { |
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.driver = { |
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.name = "touchit213", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = touchit213_serio_ids, |
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.interrupt = touchit213_interrupt, |
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.connect = touchit213_connect, |
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.disconnect = touchit213_disconnect, |
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}; |
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module_serio_driver(touchit213_drv);
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