/* * HTC Shift touchscreen driver * * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.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. */ #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/init.h> #include <linux/irq.h> #include <linux/isa.h> #include <linux/ioport.h> #include <linux/dmi.h> MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>"); MODULE_DESCRIPTION("HTC Shift touchscreen driver"); MODULE_LICENSE("GPL"); #define HTCPEN_PORT_IRQ_CLEAR 0x068 #define HTCPEN_PORT_INIT 0x06c #define HTCPEN_PORT_INDEX 0x0250 #define HTCPEN_PORT_DATA 0x0251 #define HTCPEN_IRQ 3 #define DEVICE_ENABLE 0xa2 #define DEVICE_DISABLE 0xa3 #define X_INDEX 3 #define Y_INDEX 5 #define TOUCH_INDEX 0xb #define LSB_XY_INDEX 0xc #define X_AXIS_MAX 2040 #define Y_AXIS_MAX 2040 static bool invert_x; module_param(invert_x, bool, 0644); MODULE_PARM_DESC(invert_x, "If set, X axis is inverted"); static bool invert_y; module_param(invert_y, bool, 0644); MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted"); static irqreturn_t htcpen_interrupt(int irq, void *handle) { struct input_dev *htcpen_dev = handle; unsigned short x, y, xy; /* 0 = press; 1 = release */ outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX); if (inb_p(HTCPEN_PORT_DATA)) { input_report_key(htcpen_dev, BTN_TOUCH, 0); } else { outb_p(X_INDEX, HTCPEN_PORT_INDEX); x = inb_p(HTCPEN_PORT_DATA); outb_p(Y_INDEX, HTCPEN_PORT_INDEX); y = inb_p(HTCPEN_PORT_DATA); outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX); xy = inb_p(HTCPEN_PORT_DATA); /* get high resolution value of X and Y using LSB */ x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf)); y = (y * 8) + (xy & 0xf); if (invert_x) x = X_AXIS_MAX - x; if (invert_y) y = Y_AXIS_MAX - y; if (x != X_AXIS_MAX && x != 0) { input_report_key(htcpen_dev, BTN_TOUCH, 1); input_report_abs(htcpen_dev, ABS_X, x); input_report_abs(htcpen_dev, ABS_Y, y); } } input_sync(htcpen_dev); inb_p(HTCPEN_PORT_IRQ_CLEAR); return IRQ_HANDLED; } static int htcpen_open(struct input_dev *dev) { outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT); return 0; } static void htcpen_close(struct input_dev *dev) { outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT); synchronize_irq(HTCPEN_IRQ); } static int htcpen_isa_probe(struct device *dev, unsigned int id) { struct input_dev *htcpen_dev; int err = -EBUSY; if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) { printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", HTCPEN_PORT_IRQ_CLEAR); goto request_region1_failed; } if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) { printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", HTCPEN_PORT_INIT); goto request_region2_failed; } if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) { printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", HTCPEN_PORT_INDEX); goto request_region3_failed; } htcpen_dev = input_allocate_device(); if (!htcpen_dev) { printk(KERN_ERR "htcpen: can't allocate device\n"); err = -ENOMEM; goto input_alloc_failed; } htcpen_dev->name = "HTC Shift EC TouchScreen"; htcpen_dev->id.bustype = BUS_ISA; htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0); input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0); htcpen_dev->open = htcpen_open; htcpen_dev->close = htcpen_close; err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen", htcpen_dev); if (err) { printk(KERN_ERR "htcpen: irq busy\n"); goto request_irq_failed; } inb_p(HTCPEN_PORT_IRQ_CLEAR); err = input_register_device(htcpen_dev); if (err) goto input_register_failed; dev_set_drvdata(dev, htcpen_dev); return 0; input_register_failed: free_irq(HTCPEN_IRQ, htcpen_dev); request_irq_failed: input_free_device(htcpen_dev); input_alloc_failed: release_region(HTCPEN_PORT_INDEX, 2); request_region3_failed: release_region(HTCPEN_PORT_INIT, 1); request_region2_failed: release_region(HTCPEN_PORT_IRQ_CLEAR, 1); request_region1_failed: return err; } static int htcpen_isa_remove(struct device *dev, unsigned int id) { struct input_dev *htcpen_dev = dev_get_drvdata(dev); input_unregister_device(htcpen_dev); free_irq(HTCPEN_IRQ, htcpen_dev); release_region(HTCPEN_PORT_INDEX, 2); release_region(HTCPEN_PORT_INIT, 1); release_region(HTCPEN_PORT_IRQ_CLEAR, 1); return 0; } #ifdef CONFIG_PM static int htcpen_isa_suspend(struct device *dev, unsigned int n, pm_message_t state) { outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT); return 0; } static int htcpen_isa_resume(struct device *dev, unsigned int n) { outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT); return 0; } #endif static struct isa_driver htcpen_isa_driver = { .probe = htcpen_isa_probe, .remove = htcpen_isa_remove, #ifdef CONFIG_PM .suspend = htcpen_isa_suspend, .resume = htcpen_isa_resume, #endif .driver = { .owner = THIS_MODULE, .name = "htcpen", } }; static const struct dmi_system_id htcshift_dmi_table[] __initconst = { { .ident = "Shift", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"), DMI_MATCH(DMI_PRODUCT_NAME, "Shift"), }, }, { } }; MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table); static int __init htcpen_isa_init(void) { if (!dmi_check_system(htcshift_dmi_table)) return -ENODEV; return isa_register_driver(&htcpen_isa_driver, 1); } static void __exit htcpen_isa_exit(void) { isa_unregister_driver(&htcpen_isa_driver); } module_init(htcpen_isa_init); module_exit(htcpen_isa_exit);