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174 lines
3.7 KiB
174 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Touchright serial touchscreen driver |
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* |
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* Copyright (c) 2006 Rick Koch <[email protected]> |
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* |
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* Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c) |
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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 "Touchright serial touchscreen driver" |
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MODULE_AUTHOR("Rick Koch <[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 TR_FORMAT_TOUCH_BIT 0x01 |
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#define TR_FORMAT_STATUS_BYTE 0x40 |
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#define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT |
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#define TR_LENGTH 5 |
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#define TR_MIN_XC 0 |
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#define TR_MAX_XC 0x1ff |
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#define TR_MIN_YC 0 |
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#define TR_MAX_YC 0x1ff |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct tr { |
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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[TR_LENGTH]; |
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char phys[32]; |
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}; |
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static irqreturn_t tr_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct tr *tr = serio_get_drvdata(serio); |
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struct input_dev *dev = tr->dev; |
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tr->data[tr->idx] = data; |
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if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) { |
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if (++tr->idx == TR_LENGTH) { |
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input_report_abs(dev, ABS_X, |
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(tr->data[1] << 5) | (tr->data[2] >> 1)); |
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input_report_abs(dev, ABS_Y, |
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(tr->data[3] << 5) | (tr->data[4] >> 1)); |
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input_report_key(dev, BTN_TOUCH, |
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tr->data[0] & TR_FORMAT_TOUCH_BIT); |
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input_sync(dev); |
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tr->idx = 0; |
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} |
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} |
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return IRQ_HANDLED; |
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} |
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/* |
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* tr_disconnect() is the opposite of tr_connect() |
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*/ |
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static void tr_disconnect(struct serio *serio) |
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{ |
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struct tr *tr = serio_get_drvdata(serio); |
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input_get_device(tr->dev); |
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input_unregister_device(tr->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(tr->dev); |
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kfree(tr); |
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} |
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/* |
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* tr_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 tr_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct tr *tr; |
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struct input_dev *input_dev; |
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int err; |
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tr = kzalloc(sizeof(struct tr), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!tr || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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tr->serio = serio; |
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tr->dev = input_dev; |
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snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys); |
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input_dev->name = "Touchright Serial TouchScreen"; |
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input_dev->phys = tr->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_TOUCHRIGHT; |
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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(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0); |
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input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0); |
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serio_set_drvdata(serio, tr); |
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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(tr->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(tr); |
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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 tr_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_TOUCHRIGHT, |
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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, tr_serio_ids); |
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static struct serio_driver tr_drv = { |
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.driver = { |
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.name = "touchright", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = tr_serio_ids, |
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.interrupt = tr_interrupt, |
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.connect = tr_connect, |
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.disconnect = tr_disconnect, |
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}; |
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module_serio_driver(tr_drv);
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