/* * drivers/input/touchscreen/jornada720_ts.c * * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com> * * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl> * based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org> * * 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. * * HP Jornada 710/720/729 Touchscreen Driver */ #include <linux/platform_device.h> #include <linux/init.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/module.h> #include <mach/hardware.h> #include <mach/jornada720.h> MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); MODULE_LICENSE("GPL v2"); struct jornada_ts { struct input_dev *dev; int x_data[4]; /* X sample values */ int y_data[4]; /* Y sample values */ }; static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) { /* 3 low word X samples */ jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); /* 3 low word Y samples */ jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); /* combined x samples bits */ jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); /* combined y samples bits */ jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); } static int jornada720_ts_average(int coords[4]) { int coord, high_bits = coords[3]; coord = coords[0] | ((high_bits & 0x03) << 8); coord += coords[1] | ((high_bits & 0x0c) << 6); coord += coords[2] | ((high_bits & 0x30) << 4); return coord / 3; } static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) { struct platform_device *pdev = dev_id; struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); struct input_dev *input = jornada_ts->dev; int x, y; /* If GPIO_GPIO9 is set to high then report pen up */ if (GPLR & GPIO_GPIO(9)) { input_report_key(input, BTN_TOUCH, 0); input_sync(input); } else { jornada_ssp_start(); /* proper reply to request is always TXDUMMY */ if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { jornada720_ts_collect_data(jornada_ts); x = jornada720_ts_average(jornada_ts->x_data); y = jornada720_ts_average(jornada_ts->y_data); input_report_key(input, BTN_TOUCH, 1); input_report_abs(input, ABS_X, x); input_report_abs(input, ABS_Y, y); input_sync(input); } jornada_ssp_end(); } return IRQ_HANDLED; } static int __devinit jornada720_ts_probe(struct platform_device *pdev) { struct jornada_ts *jornada_ts; struct input_dev *input_dev; int error; jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL); input_dev = input_allocate_device(); if (!jornada_ts || !input_dev) { error = -ENOMEM; goto fail1; } platform_set_drvdata(pdev, jornada_ts); jornada_ts->dev = input_dev; input_dev->name = "HP Jornada 7xx Touchscreen"; input_dev->phys = "jornadats/input0"; input_dev->id.bustype = BUS_HOST; input_dev->dev.parent = &pdev->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(input_dev, ABS_X, 270, 3900, 0, 0); input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); error = request_irq(IRQ_GPIO9, jornada720_ts_interrupt, IRQF_DISABLED | IRQF_TRIGGER_RISING, "HP7XX Touchscreen driver", pdev); if (error) { printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n"); goto fail1; } error = input_register_device(jornada_ts->dev); if (error) goto fail2; return 0; fail2: free_irq(IRQ_GPIO9, pdev); fail1: platform_set_drvdata(pdev, NULL); input_free_device(input_dev); kfree(jornada_ts); return error; } static int __devexit jornada720_ts_remove(struct platform_device *pdev) { struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); free_irq(IRQ_GPIO9, pdev); platform_set_drvdata(pdev, NULL); input_unregister_device(jornada_ts->dev); kfree(jornada_ts); return 0; } /* work with hotplug and coldplug */ MODULE_ALIAS("platform:jornada_ts"); static struct platform_driver jornada720_ts_driver = { .probe = jornada720_ts_probe, .remove = __devexit_p(jornada720_ts_remove), .driver = { .name = "jornada_ts", .owner = THIS_MODULE, }, }; static int __init jornada720_ts_init(void) { return platform_driver_register(&jornada720_ts_driver); } static void __exit jornada720_ts_exit(void) { platform_driver_unregister(&jornada720_ts_driver); } module_init(jornada720_ts_init); module_exit(jornada720_ts_exit);