1/* 2 * Stephen Evanchik <evanchsa@gmail.com> 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 as published by 6 * the Free Software Foundation. 7 * 8 * Trademarks are the property of their respective owners. 9 */ 10 11#include <linux/slab.h> 12#include <linux/delay.h> 13#include <linux/serio.h> 14#include <linux/module.h> 15#include <linux/input.h> 16#include <linux/libps2.h> 17#include <linux/proc_fs.h> 18#include <asm/uaccess.h> 19#include "psmouse.h" 20#include "trackpoint.h" 21 22/* 23 * Device IO: read, write and toggle bit 24 */ 25static int trackpoint_read(struct ps2dev *ps2dev, unsigned char loc, unsigned char *results) 26{ 27 if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || 28 ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) { 29 return -1; 30 } 31 32 return 0; 33} 34 35static int trackpoint_write(struct ps2dev *ps2dev, unsigned char loc, unsigned char val) 36{ 37 if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || 38 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) || 39 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) || 40 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) { 41 return -1; 42 } 43 44 return 0; 45} 46 47static int trackpoint_toggle_bit(struct ps2dev *ps2dev, unsigned char loc, unsigned char mask) 48{ 49 /* Bad things will happen if the loc param isn't in this range */ 50 if (loc < 0x20 || loc >= 0x2F) 51 return -1; 52 53 if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || 54 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) || 55 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) || 56 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) { 57 return -1; 58 } 59 60 return 0; 61} 62 63 64/* 65 * Trackpoint-specific attributes 66 */ 67struct trackpoint_attr_data { 68 size_t field_offset; 69 unsigned char command; 70 unsigned char mask; 71 unsigned char inverted; 72}; 73 74static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse, void *data, char *buf) 75{ 76 struct trackpoint_data *tp = psmouse->private; 77 struct trackpoint_attr_data *attr = data; 78 unsigned char value = *(unsigned char *)((char *)tp + attr->field_offset); 79 80 if (attr->inverted) 81 value = !value; 82 83 return sprintf(buf, "%u\n", value); 84} 85 86static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data, 87 const char *buf, size_t count) 88{ 89 struct trackpoint_data *tp = psmouse->private; 90 struct trackpoint_attr_data *attr = data; 91 unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset); 92 unsigned long value; 93 94 if (strict_strtoul(buf, 10, &value) || value > 255) 95 return -EINVAL; 96 97 *field = value; 98 trackpoint_write(&psmouse->ps2dev, attr->command, value); 99 100 return count; 101} 102 103#define TRACKPOINT_INT_ATTR(_name, _command) \ 104 static struct trackpoint_attr_data trackpoint_attr_##_name = { \ 105 .field_offset = offsetof(struct trackpoint_data, _name), \ 106 .command = _command, \ 107 }; \ 108 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 109 &trackpoint_attr_##_name, \ 110 trackpoint_show_int_attr, trackpoint_set_int_attr) 111 112static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data, 113 const char *buf, size_t count) 114{ 115 struct trackpoint_data *tp = psmouse->private; 116 struct trackpoint_attr_data *attr = data; 117 unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset); 118 unsigned long value; 119 120 if (strict_strtoul(buf, 10, &value) || value > 1) 121 return -EINVAL; 122 123 if (attr->inverted) 124 value = !value; 125 126 if (*field != value) { 127 *field = value; 128 trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask); 129 } 130 131 return count; 132} 133 134 135#define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv) \ 136 static struct trackpoint_attr_data trackpoint_attr_##_name = { \ 137 .field_offset = offsetof(struct trackpoint_data, _name), \ 138 .command = _command, \ 139 .mask = _mask, \ 140 .inverted = _inv, \ 141 }; \ 142 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 143 &trackpoint_attr_##_name, \ 144 trackpoint_show_int_attr, trackpoint_set_bit_attr) 145 146TRACKPOINT_INT_ATTR(sensitivity, TP_SENS); 147TRACKPOINT_INT_ATTR(speed, TP_SPEED); 148TRACKPOINT_INT_ATTR(inertia, TP_INERTIA); 149TRACKPOINT_INT_ATTR(reach, TP_REACH); 150TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS); 151TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG); 152TRACKPOINT_INT_ATTR(thresh, TP_THRESH); 153TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH); 154TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME); 155TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV); 156 157TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0); 158TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0); 159TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1); 160 161static struct attribute *trackpoint_attrs[] = { 162 &psmouse_attr_sensitivity.dattr.attr, 163 &psmouse_attr_speed.dattr.attr, 164 &psmouse_attr_inertia.dattr.attr, 165 &psmouse_attr_reach.dattr.attr, 166 &psmouse_attr_draghys.dattr.attr, 167 &psmouse_attr_mindrag.dattr.attr, 168 &psmouse_attr_thresh.dattr.attr, 169 &psmouse_attr_upthresh.dattr.attr, 170 &psmouse_attr_ztime.dattr.attr, 171 &psmouse_attr_jenks.dattr.attr, 172 &psmouse_attr_press_to_select.dattr.attr, 173 &psmouse_attr_skipback.dattr.attr, 174 &psmouse_attr_ext_dev.dattr.attr, 175 NULL 176}; 177 178static struct attribute_group trackpoint_attr_group = { 179 .attrs = trackpoint_attrs, 180}; 181 182static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *firmware_id) 183{ 184 unsigned char param[2] = { 0 }; 185 186 if (ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID))) 187 return -1; 188 189 if (param[0] != TP_MAGIC_IDENT) 190 return -1; 191 192 if (firmware_id) 193 *firmware_id = param[1]; 194 195 return 0; 196} 197 198static int trackpoint_sync(struct psmouse *psmouse) 199{ 200 struct trackpoint_data *tp = psmouse->private; 201 unsigned char toggle; 202 203 /* Disable features that may make device unusable with this driver */ 204 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, &toggle); 205 if (toggle & TP_MASK_TWOHAND) 206 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, TP_MASK_TWOHAND); 207 208 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, &toggle); 209 if (toggle & TP_MASK_SOURCE_TAG) 210 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, TP_MASK_SOURCE_TAG); 211 212 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_MB, &toggle); 213 if (toggle & TP_MASK_MB) 214 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_MB, TP_MASK_MB); 215 216 /* Push the config to the device */ 217 trackpoint_write(&psmouse->ps2dev, TP_SENS, tp->sensitivity); 218 trackpoint_write(&psmouse->ps2dev, TP_INERTIA, tp->inertia); 219 trackpoint_write(&psmouse->ps2dev, TP_SPEED, tp->speed); 220 221 trackpoint_write(&psmouse->ps2dev, TP_REACH, tp->reach); 222 trackpoint_write(&psmouse->ps2dev, TP_DRAGHYS, tp->draghys); 223 trackpoint_write(&psmouse->ps2dev, TP_MINDRAG, tp->mindrag); 224 225 trackpoint_write(&psmouse->ps2dev, TP_THRESH, tp->thresh); 226 trackpoint_write(&psmouse->ps2dev, TP_UP_THRESH, tp->upthresh); 227 228 trackpoint_write(&psmouse->ps2dev, TP_Z_TIME, tp->ztime); 229 trackpoint_write(&psmouse->ps2dev, TP_JENKS_CURV, tp->jenks); 230 231 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_PTSON, &toggle); 232 if (((toggle & TP_MASK_PTSON) == TP_MASK_PTSON) != tp->press_to_select) 233 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_PTSON, TP_MASK_PTSON); 234 235 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, &toggle); 236 if (((toggle & TP_MASK_SKIPBACK) == TP_MASK_SKIPBACK) != tp->skipback) 237 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK); 238 239 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, &toggle); 240 if (((toggle & TP_MASK_EXT_DEV) == TP_MASK_EXT_DEV) != tp->ext_dev) 241 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV); 242 243 return 0; 244} 245 246static void trackpoint_defaults(struct trackpoint_data *tp) 247{ 248 tp->press_to_select = TP_DEF_PTSON; 249 tp->sensitivity = TP_DEF_SENS; 250 tp->speed = TP_DEF_SPEED; 251 tp->reach = TP_DEF_REACH; 252 253 tp->draghys = TP_DEF_DRAGHYS; 254 tp->mindrag = TP_DEF_MINDRAG; 255 256 tp->thresh = TP_DEF_THRESH; 257 tp->upthresh = TP_DEF_UP_THRESH; 258 259 tp->ztime = TP_DEF_Z_TIME; 260 tp->jenks = TP_DEF_JENKS_CURV; 261 262 tp->inertia = TP_DEF_INERTIA; 263 tp->skipback = TP_DEF_SKIPBACK; 264 tp->ext_dev = TP_DEF_EXT_DEV; 265} 266 267static void trackpoint_disconnect(struct psmouse *psmouse) 268{ 269 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group); 270 271 kfree(psmouse->private); 272 psmouse->private = NULL; 273} 274 275static int trackpoint_reconnect(struct psmouse *psmouse) 276{ 277 if (trackpoint_start_protocol(psmouse, NULL)) 278 return -1; 279 280 if (trackpoint_sync(psmouse)) 281 return -1; 282 283 return 0; 284} 285 286int trackpoint_detect(struct psmouse *psmouse, bool set_properties) 287{ 288 struct ps2dev *ps2dev = &psmouse->ps2dev; 289 unsigned char firmware_id; 290 unsigned char button_info; 291 int error; 292 293 if (trackpoint_start_protocol(psmouse, &firmware_id)) 294 return -1; 295 296 if (!set_properties) 297 return 0; 298 299 if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) { 300 printk(KERN_WARNING "trackpoint.c: failed to get extended button data\n"); 301 button_info = 0; 302 } 303 304 psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL); 305 if (!psmouse->private) 306 return -1; 307 308 psmouse->vendor = "IBM"; 309 psmouse->name = "TrackPoint"; 310 311 psmouse->reconnect = trackpoint_reconnect; 312 psmouse->disconnect = trackpoint_disconnect; 313 314 if ((button_info & 0x0f) >= 3) 315 __set_bit(BTN_MIDDLE, psmouse->dev->keybit); 316 317 trackpoint_defaults(psmouse->private); 318 trackpoint_sync(psmouse); 319 320 error = sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group); 321 if (error) { 322 printk(KERN_ERR 323 "trackpoint.c: failed to create sysfs attributes, error: %d\n", 324 error); 325 kfree(psmouse->private); 326 psmouse->private = NULL; 327 return -1; 328 } 329 330 printk(KERN_INFO "IBM TrackPoint firmware: 0x%02x, buttons: %d/%d\n", 331 firmware_id, (button_info & 0xf0) >> 4, button_info & 0x0f); 332 333 return 0; 334} 335