1 /* 2 * HTC Shift touchscreen driver 3 * 4 * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published 8 * by the Free Software Foundation. 9 */ 10 11 #include <linux/errno.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/input.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/init.h> 18 #include <linux/irq.h> 19 #include <linux/isa.h> 20 #include <linux/ioport.h> 21 #include <linux/dmi.h> 22 23 MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>"); 24 MODULE_DESCRIPTION("HTC Shift touchscreen driver"); 25 MODULE_LICENSE("GPL"); 26 27 #define HTCPEN_PORT_IRQ_CLEAR 0x068 28 #define HTCPEN_PORT_INIT 0x06c 29 #define HTCPEN_PORT_INDEX 0x0250 30 #define HTCPEN_PORT_DATA 0x0251 31 #define HTCPEN_IRQ 3 32 33 #define DEVICE_ENABLE 0xa2 34 #define DEVICE_DISABLE 0xa3 35 36 #define X_INDEX 3 37 #define Y_INDEX 5 38 #define TOUCH_INDEX 0xb 39 #define LSB_XY_INDEX 0xc 40 #define X_AXIS_MAX 2040 41 #define Y_AXIS_MAX 2040 42 43 static bool invert_x; 44 module_param(invert_x, bool, 0644); 45 MODULE_PARM_DESC(invert_x, "If set, X axis is inverted"); 46 static bool invert_y; 47 module_param(invert_y, bool, 0644); 48 MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted"); 49 50 static irqreturn_t htcpen_interrupt(int irq, void *handle) 51 { 52 struct input_dev *htcpen_dev = handle; 53 unsigned short x, y, xy; 54 55 /* 0 = press; 1 = release */ 56 outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX); 57 58 if (inb_p(HTCPEN_PORT_DATA)) { 59 input_report_key(htcpen_dev, BTN_TOUCH, 0); 60 } else { 61 outb_p(X_INDEX, HTCPEN_PORT_INDEX); 62 x = inb_p(HTCPEN_PORT_DATA); 63 64 outb_p(Y_INDEX, HTCPEN_PORT_INDEX); 65 y = inb_p(HTCPEN_PORT_DATA); 66 67 outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX); 68 xy = inb_p(HTCPEN_PORT_DATA); 69 70 /* get high resolution value of X and Y using LSB */ 71 x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf)); 72 y = (y * 8) + (xy & 0xf); 73 if (invert_x) 74 x = X_AXIS_MAX - x; 75 if (invert_y) 76 y = Y_AXIS_MAX - y; 77 78 if (x != X_AXIS_MAX && x != 0) { 79 input_report_key(htcpen_dev, BTN_TOUCH, 1); 80 input_report_abs(htcpen_dev, ABS_X, x); 81 input_report_abs(htcpen_dev, ABS_Y, y); 82 } 83 } 84 85 input_sync(htcpen_dev); 86 87 inb_p(HTCPEN_PORT_IRQ_CLEAR); 88 89 return IRQ_HANDLED; 90 } 91 92 static int htcpen_open(struct input_dev *dev) 93 { 94 outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT); 95 96 return 0; 97 } 98 99 static void htcpen_close(struct input_dev *dev) 100 { 101 outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT); 102 synchronize_irq(HTCPEN_IRQ); 103 } 104 105 static int htcpen_isa_probe(struct device *dev, unsigned int id) 106 { 107 struct input_dev *htcpen_dev; 108 int err = -EBUSY; 109 110 if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) { 111 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", 112 HTCPEN_PORT_IRQ_CLEAR); 113 goto request_region1_failed; 114 } 115 116 if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) { 117 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", 118 HTCPEN_PORT_INIT); 119 goto request_region2_failed; 120 } 121 122 if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) { 123 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", 124 HTCPEN_PORT_INDEX); 125 goto request_region3_failed; 126 } 127 128 htcpen_dev = input_allocate_device(); 129 if (!htcpen_dev) { 130 printk(KERN_ERR "htcpen: can't allocate device\n"); 131 err = -ENOMEM; 132 goto input_alloc_failed; 133 } 134 135 htcpen_dev->name = "HTC Shift EC TouchScreen"; 136 htcpen_dev->id.bustype = BUS_ISA; 137 138 htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); 139 htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 140 input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0); 141 input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0); 142 143 htcpen_dev->open = htcpen_open; 144 htcpen_dev->close = htcpen_close; 145 146 err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen", 147 htcpen_dev); 148 if (err) { 149 printk(KERN_ERR "htcpen: irq busy\n"); 150 goto request_irq_failed; 151 } 152 153 inb_p(HTCPEN_PORT_IRQ_CLEAR); 154 155 err = input_register_device(htcpen_dev); 156 if (err) 157 goto input_register_failed; 158 159 dev_set_drvdata(dev, htcpen_dev); 160 161 return 0; 162 163 input_register_failed: 164 free_irq(HTCPEN_IRQ, htcpen_dev); 165 request_irq_failed: 166 input_free_device(htcpen_dev); 167 input_alloc_failed: 168 release_region(HTCPEN_PORT_INDEX, 2); 169 request_region3_failed: 170 release_region(HTCPEN_PORT_INIT, 1); 171 request_region2_failed: 172 release_region(HTCPEN_PORT_IRQ_CLEAR, 1); 173 request_region1_failed: 174 return err; 175 } 176 177 static int htcpen_isa_remove(struct device *dev, unsigned int id) 178 { 179 struct input_dev *htcpen_dev = dev_get_drvdata(dev); 180 181 input_unregister_device(htcpen_dev); 182 183 free_irq(HTCPEN_IRQ, htcpen_dev); 184 185 release_region(HTCPEN_PORT_INDEX, 2); 186 release_region(HTCPEN_PORT_INIT, 1); 187 release_region(HTCPEN_PORT_IRQ_CLEAR, 1); 188 189 return 0; 190 } 191 192 #ifdef CONFIG_PM 193 static int htcpen_isa_suspend(struct device *dev, unsigned int n, 194 pm_message_t state) 195 { 196 outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT); 197 198 return 0; 199 } 200 201 static int htcpen_isa_resume(struct device *dev, unsigned int n) 202 { 203 outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT); 204 205 return 0; 206 } 207 #endif 208 209 static struct isa_driver htcpen_isa_driver = { 210 .probe = htcpen_isa_probe, 211 .remove = htcpen_isa_remove, 212 #ifdef CONFIG_PM 213 .suspend = htcpen_isa_suspend, 214 .resume = htcpen_isa_resume, 215 #endif 216 .driver = { 217 .owner = THIS_MODULE, 218 .name = "htcpen", 219 } 220 }; 221 222 static const struct dmi_system_id htcshift_dmi_table[] __initconst = { 223 { 224 .ident = "Shift", 225 .matches = { 226 DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"), 227 DMI_MATCH(DMI_PRODUCT_NAME, "Shift"), 228 }, 229 }, 230 { } 231 }; 232 MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table); 233 234 static int __init htcpen_isa_init(void) 235 { 236 if (!dmi_check_system(htcshift_dmi_table)) 237 return -ENODEV; 238 239 return isa_register_driver(&htcpen_isa_driver, 1); 240 } 241 242 static void __exit htcpen_isa_exit(void) 243 { 244 isa_unregister_driver(&htcpen_isa_driver); 245 } 246 247 module_init(htcpen_isa_init); 248 module_exit(htcpen_isa_exit); 249