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 */ 25 static 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 35 static 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 47 static 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 */ 67 struct trackpoint_attr_data { 68 size_t field_offset; 69 unsigned char command; 70 unsigned char mask; 71 unsigned char inverted; 72 }; 73 74 static 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 86 static 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 char value; 93 int err; 94 95 err = kstrtou8(buf, 10, &value); 96 if (err) 97 return err; 98 99 *field = value; 100 trackpoint_write(&psmouse->ps2dev, attr->command, value); 101 102 return count; 103 } 104 105 #define TRACKPOINT_INT_ATTR(_name, _command) \ 106 static struct trackpoint_attr_data trackpoint_attr_##_name = { \ 107 .field_offset = offsetof(struct trackpoint_data, _name), \ 108 .command = _command, \ 109 }; \ 110 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 111 &trackpoint_attr_##_name, \ 112 trackpoint_show_int_attr, trackpoint_set_int_attr) 113 114 static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data, 115 const char *buf, size_t count) 116 { 117 struct trackpoint_data *tp = psmouse->private; 118 struct trackpoint_attr_data *attr = data; 119 unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset); 120 unsigned int value; 121 int err; 122 123 err = kstrtouint(buf, 10, &value); 124 if (err) 125 return err; 126 127 if (value > 1) 128 return -EINVAL; 129 130 if (attr->inverted) 131 value = !value; 132 133 if (*field != value) { 134 *field = value; 135 trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask); 136 } 137 138 return count; 139 } 140 141 142 #define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv) \ 143 static struct trackpoint_attr_data trackpoint_attr_##_name = { \ 144 .field_offset = offsetof(struct trackpoint_data, _name), \ 145 .command = _command, \ 146 .mask = _mask, \ 147 .inverted = _inv, \ 148 }; \ 149 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 150 &trackpoint_attr_##_name, \ 151 trackpoint_show_int_attr, trackpoint_set_bit_attr) 152 153 TRACKPOINT_INT_ATTR(sensitivity, TP_SENS); 154 TRACKPOINT_INT_ATTR(speed, TP_SPEED); 155 TRACKPOINT_INT_ATTR(inertia, TP_INERTIA); 156 TRACKPOINT_INT_ATTR(reach, TP_REACH); 157 TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS); 158 TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG); 159 TRACKPOINT_INT_ATTR(thresh, TP_THRESH); 160 TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH); 161 TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME); 162 TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV); 163 164 TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0); 165 TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0); 166 TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1); 167 168 static struct attribute *trackpoint_attrs[] = { 169 &psmouse_attr_sensitivity.dattr.attr, 170 &psmouse_attr_speed.dattr.attr, 171 &psmouse_attr_inertia.dattr.attr, 172 &psmouse_attr_reach.dattr.attr, 173 &psmouse_attr_draghys.dattr.attr, 174 &psmouse_attr_mindrag.dattr.attr, 175 &psmouse_attr_thresh.dattr.attr, 176 &psmouse_attr_upthresh.dattr.attr, 177 &psmouse_attr_ztime.dattr.attr, 178 &psmouse_attr_jenks.dattr.attr, 179 &psmouse_attr_press_to_select.dattr.attr, 180 &psmouse_attr_skipback.dattr.attr, 181 &psmouse_attr_ext_dev.dattr.attr, 182 NULL 183 }; 184 185 static struct attribute_group trackpoint_attr_group = { 186 .attrs = trackpoint_attrs, 187 }; 188 189 static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *firmware_id) 190 { 191 unsigned char param[2] = { 0 }; 192 193 if (ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID))) 194 return -1; 195 196 if (param[0] != TP_MAGIC_IDENT) 197 return -1; 198 199 if (firmware_id) 200 *firmware_id = param[1]; 201 202 return 0; 203 } 204 205 static int trackpoint_sync(struct psmouse *psmouse) 206 { 207 struct trackpoint_data *tp = psmouse->private; 208 unsigned char toggle; 209 210 /* Disable features that may make device unusable with this driver */ 211 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, &toggle); 212 if (toggle & TP_MASK_TWOHAND) 213 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, TP_MASK_TWOHAND); 214 215 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, &toggle); 216 if (toggle & TP_MASK_SOURCE_TAG) 217 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, TP_MASK_SOURCE_TAG); 218 219 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_MB, &toggle); 220 if (toggle & TP_MASK_MB) 221 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_MB, TP_MASK_MB); 222 223 /* Push the config to the device */ 224 trackpoint_write(&psmouse->ps2dev, TP_SENS, tp->sensitivity); 225 trackpoint_write(&psmouse->ps2dev, TP_INERTIA, tp->inertia); 226 trackpoint_write(&psmouse->ps2dev, TP_SPEED, tp->speed); 227 228 trackpoint_write(&psmouse->ps2dev, TP_REACH, tp->reach); 229 trackpoint_write(&psmouse->ps2dev, TP_DRAGHYS, tp->draghys); 230 trackpoint_write(&psmouse->ps2dev, TP_MINDRAG, tp->mindrag); 231 232 trackpoint_write(&psmouse->ps2dev, TP_THRESH, tp->thresh); 233 trackpoint_write(&psmouse->ps2dev, TP_UP_THRESH, tp->upthresh); 234 235 trackpoint_write(&psmouse->ps2dev, TP_Z_TIME, tp->ztime); 236 trackpoint_write(&psmouse->ps2dev, TP_JENKS_CURV, tp->jenks); 237 238 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_PTSON, &toggle); 239 if (((toggle & TP_MASK_PTSON) == TP_MASK_PTSON) != tp->press_to_select) 240 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_PTSON, TP_MASK_PTSON); 241 242 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, &toggle); 243 if (((toggle & TP_MASK_SKIPBACK) == TP_MASK_SKIPBACK) != tp->skipback) 244 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK); 245 246 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, &toggle); 247 if (((toggle & TP_MASK_EXT_DEV) == TP_MASK_EXT_DEV) != tp->ext_dev) 248 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV); 249 250 return 0; 251 } 252 253 static void trackpoint_defaults(struct trackpoint_data *tp) 254 { 255 tp->press_to_select = TP_DEF_PTSON; 256 tp->sensitivity = TP_DEF_SENS; 257 tp->speed = TP_DEF_SPEED; 258 tp->reach = TP_DEF_REACH; 259 260 tp->draghys = TP_DEF_DRAGHYS; 261 tp->mindrag = TP_DEF_MINDRAG; 262 263 tp->thresh = TP_DEF_THRESH; 264 tp->upthresh = TP_DEF_UP_THRESH; 265 266 tp->ztime = TP_DEF_Z_TIME; 267 tp->jenks = TP_DEF_JENKS_CURV; 268 269 tp->inertia = TP_DEF_INERTIA; 270 tp->skipback = TP_DEF_SKIPBACK; 271 tp->ext_dev = TP_DEF_EXT_DEV; 272 } 273 274 static void trackpoint_disconnect(struct psmouse *psmouse) 275 { 276 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group); 277 278 kfree(psmouse->private); 279 psmouse->private = NULL; 280 } 281 282 static int trackpoint_reconnect(struct psmouse *psmouse) 283 { 284 if (trackpoint_start_protocol(psmouse, NULL)) 285 return -1; 286 287 if (trackpoint_sync(psmouse)) 288 return -1; 289 290 return 0; 291 } 292 293 int trackpoint_detect(struct psmouse *psmouse, bool set_properties) 294 { 295 struct ps2dev *ps2dev = &psmouse->ps2dev; 296 unsigned char firmware_id; 297 unsigned char button_info; 298 int error; 299 300 if (trackpoint_start_protocol(psmouse, &firmware_id)) 301 return -1; 302 303 if (!set_properties) 304 return 0; 305 306 if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) { 307 psmouse_warn(psmouse, "failed to get extended button data\n"); 308 button_info = 0; 309 } 310 311 psmouse->private = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL); 312 if (!psmouse->private) 313 return -ENOMEM; 314 315 psmouse->vendor = "IBM"; 316 psmouse->name = "TrackPoint"; 317 318 psmouse->reconnect = trackpoint_reconnect; 319 psmouse->disconnect = trackpoint_disconnect; 320 321 if ((button_info & 0x0f) >= 3) 322 __set_bit(BTN_MIDDLE, psmouse->dev->keybit); 323 324 trackpoint_defaults(psmouse->private); 325 trackpoint_sync(psmouse); 326 327 error = sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group); 328 if (error) { 329 psmouse_err(psmouse, 330 "failed to create sysfs attributes, error: %d\n", 331 error); 332 kfree(psmouse->private); 333 psmouse->private = NULL; 334 return -1; 335 } 336 337 psmouse_info(psmouse, 338 "IBM TrackPoint firmware: 0x%02x, buttons: %d/%d\n", 339 firmware_id, 340 (button_info & 0xf0) >> 4, button_info & 0x0f); 341 342 return 0; 343 } 344 345