/* * Dynapro serial touchscreen driver * * Copyright (c) 2009 Tias Guns * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and * Richard Lemon * */ /* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ /* * 2009/09/19 Tias Guns <tias@ulyssis.org> * Copied inexio.c and edited for Dynapro protocol (from retired Xorg module) */ #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/input.h> #include <linux/serio.h> #define DRIVER_DESC "Dynapro serial touchscreen driver" MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>"); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); /* * Definitions & global arrays. */ #define DYNAPRO_FORMAT_TOUCH_BIT 0x40 #define DYNAPRO_FORMAT_LENGTH 3 #define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80 #define DYNAPRO_MIN_XC 0 #define DYNAPRO_MAX_XC 0x3ff #define DYNAPRO_MIN_YC 0 #define DYNAPRO_MAX_YC 0x3ff #define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4)) #define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7)) #define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0]) /* * Per-touchscreen data. */ struct dynapro { struct input_dev *dev; struct serio *serio; int idx; unsigned char data[DYNAPRO_FORMAT_LENGTH]; char phys[32]; }; static void dynapro_process_data(struct dynapro *pdynapro) { struct input_dev *dev = pdynapro->dev; if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) { input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data)); input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data)); input_report_key(dev, BTN_TOUCH, DYNAPRO_GET_TOUCHED(pdynapro->data)); input_sync(dev); pdynapro->idx = 0; } } static irqreturn_t dynapro_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct dynapro *pdynapro = serio_get_drvdata(serio); pdynapro->data[pdynapro->idx] = data; if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0]) dynapro_process_data(pdynapro); else dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n", pdynapro->data[0]); return IRQ_HANDLED; } static void dynapro_disconnect(struct serio *serio) { struct dynapro *pdynapro = serio_get_drvdata(serio); input_get_device(pdynapro->dev); input_unregister_device(pdynapro->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(pdynapro->dev); kfree(pdynapro); } /* * dynapro_connect() is the routine that is called when someone adds a * new serio device that supports dynapro protocol and registers it as * an input device. This is usually accomplished using inputattach. */ static int dynapro_connect(struct serio *serio, struct serio_driver *drv) { struct dynapro *pdynapro; struct input_dev *input_dev; int err; pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL); input_dev = input_allocate_device(); if (!pdynapro || !input_dev) { err = -ENOMEM; goto fail1; } pdynapro->serio = serio; pdynapro->dev = input_dev; snprintf(pdynapro->phys, sizeof(pdynapro->phys), "%s/input0", serio->phys); input_dev->name = "Dynapro Serial TouchScreen"; input_dev->phys = pdynapro->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_DYNAPRO; input_dev->id.product = 0; input_dev->id.version = 0x0001; input_dev->dev.parent = &serio->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(pdynapro->dev, ABS_X, DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0); input_set_abs_params(pdynapro->dev, ABS_Y, DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0); serio_set_drvdata(serio, pdynapro); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(pdynapro->dev); if (err) goto fail3; return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(pdynapro); return err; } /* * The serio driver structure. */ static const struct serio_device_id dynapro_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_DYNAPRO, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, dynapro_serio_ids); static struct serio_driver dynapro_drv = { .driver = { .name = "dynapro", }, .description = DRIVER_DESC, .id_table = dynapro_serio_ids, .interrupt = dynapro_interrupt, .connect = dynapro_connect, .disconnect = dynapro_disconnect, }; module_serio_driver(dynapro_drv);