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185 lines
4.4 KiB
185 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Dynapro serial touchscreen driver |
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* |
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* Copyright (c) 2009 Tias Guns |
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* Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and |
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* Richard Lemon |
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*/ |
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/* |
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* 2009/09/19 Tias Guns <[email protected]> |
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* Copied inexio.c and edited for Dynapro protocol (from retired Xorg module) |
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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 "Dynapro serial touchscreen driver" |
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MODULE_AUTHOR("Tias Guns <[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 DYNAPRO_FORMAT_TOUCH_BIT 0x40 |
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#define DYNAPRO_FORMAT_LENGTH 3 |
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#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80 |
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#define DYNAPRO_MIN_XC 0 |
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#define DYNAPRO_MAX_XC 0x3ff |
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#define DYNAPRO_MIN_YC 0 |
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#define DYNAPRO_MAX_YC 0x3ff |
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#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4)) |
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#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7)) |
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#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_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 dynapro { |
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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[DYNAPRO_FORMAT_LENGTH]; |
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char phys[32]; |
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}; |
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static void dynapro_process_data(struct dynapro *pdynapro) |
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{ |
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struct input_dev *dev = pdynapro->dev; |
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if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) { |
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input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data)); |
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input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data)); |
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input_report_key(dev, BTN_TOUCH, |
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DYNAPRO_GET_TOUCHED(pdynapro->data)); |
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input_sync(dev); |
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pdynapro->idx = 0; |
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} |
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} |
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static irqreturn_t dynapro_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct dynapro *pdynapro = serio_get_drvdata(serio); |
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pdynapro->data[pdynapro->idx] = data; |
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if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0]) |
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dynapro_process_data(pdynapro); |
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else |
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dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n", |
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pdynapro->data[0]); |
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return IRQ_HANDLED; |
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} |
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static void dynapro_disconnect(struct serio *serio) |
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{ |
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struct dynapro *pdynapro = serio_get_drvdata(serio); |
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input_get_device(pdynapro->dev); |
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input_unregister_device(pdynapro->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(pdynapro->dev); |
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kfree(pdynapro); |
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} |
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/* |
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* dynapro_connect() is the routine that is called when someone adds a |
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* new serio device that supports dynapro 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 dynapro_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct dynapro *pdynapro; |
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struct input_dev *input_dev; |
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int err; |
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pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!pdynapro || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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pdynapro->serio = serio; |
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pdynapro->dev = input_dev; |
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snprintf(pdynapro->phys, sizeof(pdynapro->phys), |
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"%s/input0", serio->phys); |
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input_dev->name = "Dynapro Serial TouchScreen"; |
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input_dev->phys = pdynapro->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_DYNAPRO; |
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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(pdynapro->dev, ABS_X, |
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DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0); |
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input_set_abs_params(pdynapro->dev, ABS_Y, |
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DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0); |
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serio_set_drvdata(serio, pdynapro); |
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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(pdynapro->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(pdynapro); |
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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 dynapro_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_DYNAPRO, |
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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, dynapro_serio_ids); |
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static struct serio_driver dynapro_drv = { |
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.driver = { |
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.name = "dynapro", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = dynapro_serio_ids, |
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.interrupt = dynapro_interrupt, |
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.connect = dynapro_connect, |
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.disconnect = dynapro_disconnect, |
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}; |
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module_serio_driver(dynapro_drv);
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