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186 lines
4.4 KiB
186 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* iNexio serial touchscreen driver |
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* |
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* Copyright (c) 2008 Richard Lemon |
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* Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman |
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*/ |
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/* |
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* 2008/06/19 Richard Lemon <[email protected]> |
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* Copied mtouch.c and edited for iNexio protocol |
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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 "iNexio serial touchscreen driver" |
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MODULE_AUTHOR("Richard Lemon <[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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#define INEXIO_FORMAT_TOUCH_BIT 0x01 |
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#define INEXIO_FORMAT_LENGTH 5 |
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#define INEXIO_RESPONSE_BEGIN_BYTE 0x80 |
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/* todo: check specs for max length of all responses */ |
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#define INEXIO_MAX_LENGTH 16 |
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#define INEXIO_MIN_XC 0 |
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#define INEXIO_MAX_XC 0x3fff |
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#define INEXIO_MIN_YC 0 |
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#define INEXIO_MAX_YC 0x3fff |
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#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2]) |
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#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4]) |
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#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0]) |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct inexio { |
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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 data[INEXIO_MAX_LENGTH]; |
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char phys[32]; |
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}; |
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static void inexio_process_data(struct inexio *pinexio) |
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{ |
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struct input_dev *dev = pinexio->dev; |
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if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) { |
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input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data)); |
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input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data)); |
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input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data)); |
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input_sync(dev); |
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pinexio->idx = 0; |
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} |
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} |
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static irqreturn_t inexio_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct inexio *pinexio = serio_get_drvdata(serio); |
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pinexio->data[pinexio->idx] = data; |
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if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0]) |
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inexio_process_data(pinexio); |
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else |
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printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]); |
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return IRQ_HANDLED; |
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} |
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/* |
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* inexio_disconnect() is the opposite of inexio_connect() |
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*/ |
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static void inexio_disconnect(struct serio *serio) |
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{ |
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struct inexio *pinexio = serio_get_drvdata(serio); |
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input_get_device(pinexio->dev); |
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input_unregister_device(pinexio->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(pinexio->dev); |
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kfree(pinexio); |
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} |
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/* |
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* inexio_connect() is the routine that is called when someone adds a |
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* new serio device that supports iNexio protocol and registers it as |
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* an input device. This is usually accomplished using inputattach. |
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*/ |
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static int inexio_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct inexio *pinexio; |
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struct input_dev *input_dev; |
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int err; |
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pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!pinexio || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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pinexio->serio = serio; |
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pinexio->dev = input_dev; |
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snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys); |
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input_dev->name = "iNexio Serial TouchScreen"; |
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input_dev->phys = pinexio->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_INEXIO; |
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input_dev->id.product = 0; |
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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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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
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input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0); |
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input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0); |
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serio_set_drvdata(serio, pinexio); |
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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(pinexio->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(pinexio); |
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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 inexio_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_INEXIO, |
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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, inexio_serio_ids); |
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static struct serio_driver inexio_drv = { |
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.driver = { |
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.name = "inexio", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = inexio_serio_ids, |
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.interrupt = inexio_interrupt, |
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.connect = inexio_connect, |
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.disconnect = inexio_disconnect, |
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}; |
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module_serio_driver(inexio_drv);
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