1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HTC Shift touchscreen driver 4 * 5 * Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org> 6 */ 7 8 #include <linux/errno.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/input.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/init.h> 15 #include <linux/irq.h> 16 #include <linux/isa.h> 17 #include <linux/ioport.h> 18 #include <linux/dmi.h> 19 20 MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>"); 21 MODULE_DESCRIPTION("HTC Shift touchscreen driver"); 22 MODULE_LICENSE("GPL"); 23 24 #define HTCPEN_PORT_IRQ_CLEAR 0x068 25 #define HTCPEN_PORT_INIT 0x06c 26 #define HTCPEN_PORT_INDEX 0x0250 27 #define HTCPEN_PORT_DATA 0x0251 28 #define HTCPEN_IRQ 3 29 30 #define DEVICE_ENABLE 0xa2 31 #define DEVICE_DISABLE 0xa3 32 33 #define X_INDEX 3 34 #define Y_INDEX 5 35 #define TOUCH_INDEX 0xb 36 #define LSB_XY_INDEX 0xc 37 #define X_AXIS_MAX 2040 38 #define Y_AXIS_MAX 2040 39 40 static bool invert_x; 41 module_param(invert_x, bool, 0644); 42 MODULE_PARM_DESC(invert_x, "If set, X axis is inverted"); 43 static bool invert_y; 44 module_param(invert_y, bool, 0644); 45 MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted"); 46 47 static irqreturn_t htcpen_interrupt(int irq, void *handle) 48 { 49 struct input_dev *htcpen_dev = handle; 50 unsigned short x, y, xy; 51 52 /* 0 = press; 1 = release */ 53 outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX); 54 55 if (inb_p(HTCPEN_PORT_DATA)) { 56 input_report_key(htcpen_dev, BTN_TOUCH, 0); 57 } else { 58 outb_p(X_INDEX, HTCPEN_PORT_INDEX); 59 x = inb_p(HTCPEN_PORT_DATA); 60 61 outb_p(Y_INDEX, HTCPEN_PORT_INDEX); 62 y = inb_p(HTCPEN_PORT_DATA); 63 64 outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX); 65 xy = inb_p(HTCPEN_PORT_DATA); 66 67 /* get high resolution value of X and Y using LSB */ 68 x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf)); 69 y = (y * 8) + (xy & 0xf); 70 if (invert_x) 71 x = X_AXIS_MAX - x; 72 if (invert_y) 73 y = Y_AXIS_MAX - y; 74 75 if (x != X_AXIS_MAX && x != 0) { 76 input_report_key(htcpen_dev, BTN_TOUCH, 1); 77 input_report_abs(htcpen_dev, ABS_X, x); 78 input_report_abs(htcpen_dev, ABS_Y, y); 79 } 80 } 81 82 input_sync(htcpen_dev); 83 84 inb_p(HTCPEN_PORT_IRQ_CLEAR); 85 86 return IRQ_HANDLED; 87 } 88 89 static int htcpen_open(struct input_dev *dev) 90 { 91 outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT); 92 93 return 0; 94 } 95 96 static void htcpen_close(struct input_dev *dev) 97 { 98 outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT); 99 synchronize_irq(HTCPEN_IRQ); 100 } 101 102 static int htcpen_isa_probe(struct device *dev, unsigned int id) 103 { 104 struct input_dev *htcpen_dev; 105 int err = -EBUSY; 106 107 if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) { 108 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", 109 HTCPEN_PORT_IRQ_CLEAR); 110 goto request_region1_failed; 111 } 112 113 if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) { 114 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", 115 HTCPEN_PORT_INIT); 116 goto request_region2_failed; 117 } 118 119 if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) { 120 printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n", 121 HTCPEN_PORT_INDEX); 122 goto request_region3_failed; 123 } 124 125 htcpen_dev = input_allocate_device(); 126 if (!htcpen_dev) { 127 printk(KERN_ERR "htcpen: can't allocate device\n"); 128 err = -ENOMEM; 129 goto input_alloc_failed; 130 } 131 132 htcpen_dev->name = "HTC Shift EC TouchScreen"; 133 htcpen_dev->id.bustype = BUS_ISA; 134 135 htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); 136 htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 137 input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0); 138 input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0); 139 140 htcpen_dev->open = htcpen_open; 141 htcpen_dev->close = htcpen_close; 142 143 err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen", 144 htcpen_dev); 145 if (err) { 146 printk(KERN_ERR "htcpen: irq busy\n"); 147 goto request_irq_failed; 148 } 149 150 inb_p(HTCPEN_PORT_IRQ_CLEAR); 151 152 err = input_register_device(htcpen_dev); 153 if (err) 154 goto input_register_failed; 155 156 dev_set_drvdata(dev, htcpen_dev); 157 158 return 0; 159 160 input_register_failed: 161 free_irq(HTCPEN_IRQ, htcpen_dev); 162 request_irq_failed: 163 input_free_device(htcpen_dev); 164 input_alloc_failed: 165 release_region(HTCPEN_PORT_INDEX, 2); 166 request_region3_failed: 167 release_region(HTCPEN_PORT_INIT, 1); 168 request_region2_failed: 169 release_region(HTCPEN_PORT_IRQ_CLEAR, 1); 170 request_region1_failed: 171 return err; 172 } 173 174 static void htcpen_isa_remove(struct device *dev, unsigned int id) 175 { 176 struct input_dev *htcpen_dev = dev_get_drvdata(dev); 177 178 input_unregister_device(htcpen_dev); 179 180 free_irq(HTCPEN_IRQ, htcpen_dev); 181 182 release_region(HTCPEN_PORT_INDEX, 2); 183 release_region(HTCPEN_PORT_INIT, 1); 184 release_region(HTCPEN_PORT_IRQ_CLEAR, 1); 185 } 186 187 #ifdef CONFIG_PM 188 static int htcpen_isa_suspend(struct device *dev, unsigned int n, 189 pm_message_t state) 190 { 191 outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT); 192 193 return 0; 194 } 195 196 static int htcpen_isa_resume(struct device *dev, unsigned int n) 197 { 198 outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT); 199 200 return 0; 201 } 202 #endif 203 204 static struct isa_driver htcpen_isa_driver = { 205 .probe = htcpen_isa_probe, 206 .remove = htcpen_isa_remove, 207 #ifdef CONFIG_PM 208 .suspend = htcpen_isa_suspend, 209 .resume = htcpen_isa_resume, 210 #endif 211 .driver = { 212 .owner = THIS_MODULE, 213 .name = "htcpen", 214 } 215 }; 216 217 static const struct dmi_system_id htcshift_dmi_table[] __initconst = { 218 { 219 .ident = "Shift", 220 .matches = { 221 DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"), 222 DMI_MATCH(DMI_PRODUCT_NAME, "Shift"), 223 }, 224 }, 225 { } 226 }; 227 MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table); 228 229 static int __init htcpen_isa_init(void) 230 { 231 if (!dmi_check_system(htcshift_dmi_table)) 232 return -ENODEV; 233 234 return isa_register_driver(&htcpen_isa_driver, 1); 235 } 236 237 static void __exit htcpen_isa_exit(void) 238 { 239 isa_unregister_driver(&htcpen_isa_driver); 240 } 241 242 module_init(htcpen_isa_init); 243 module_exit(htcpen_isa_exit); 244