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/delay.h> 12 #include <linux/serio.h> 13 #include <linux/module.h> 14 #include <linux/input.h> 15 #include <linux/libps2.h> 16 #include <linux/proc_fs.h> 17 #include <asm/uaccess.h> 18 #include "psmouse.h" 19 #include "trackpoint.h" 20 21 /* 22 * Device IO: read, write and toggle bit 23 */ 24 static int trackpoint_read(struct ps2dev *ps2dev, unsigned char loc, unsigned char *results) 25 { 26 if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || 27 ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) { 28 return -1; 29 } 30 31 return 0; 32 } 33 34 static int trackpoint_write(struct ps2dev *ps2dev, unsigned char loc, unsigned char val) 35 { 36 if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || 37 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) || 38 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) || 39 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) { 40 return -1; 41 } 42 43 return 0; 44 } 45 46 static int trackpoint_toggle_bit(struct ps2dev *ps2dev, unsigned char loc, unsigned char mask) 47 { 48 /* Bad things will happen if the loc param isn't in this range */ 49 if (loc < 0x20 || loc >= 0x2F) 50 return -1; 51 52 if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) || 53 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) || 54 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) || 55 ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) { 56 return -1; 57 } 58 59 return 0; 60 } 61 62 63 /* 64 * Trackpoint-specific attributes 65 */ 66 struct trackpoint_attr_data { 67 size_t field_offset; 68 unsigned char command; 69 unsigned char mask; 70 unsigned char inverted; 71 }; 72 73 static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse, void *data, char *buf) 74 { 75 struct trackpoint_data *tp = psmouse->private; 76 struct trackpoint_attr_data *attr = data; 77 unsigned char value = *(unsigned char *)((char *)tp + attr->field_offset); 78 79 if (attr->inverted) 80 value = !value; 81 82 return sprintf(buf, "%u\n", value); 83 } 84 85 static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data, 86 const char *buf, size_t count) 87 { 88 struct trackpoint_data *tp = psmouse->private; 89 struct trackpoint_attr_data *attr = data; 90 unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset); 91 unsigned long value; 92 char *rest; 93 94 value = simple_strtoul(buf, &rest, 10); 95 if (*rest || value > 255) 96 return -EINVAL; 97 98 *field = value; 99 trackpoint_write(&psmouse->ps2dev, attr->command, value); 100 101 return count; 102 } 103 104 #define TRACKPOINT_INT_ATTR(_name, _command) \ 105 static struct trackpoint_attr_data trackpoint_attr_##_name = { \ 106 .field_offset = offsetof(struct trackpoint_data, _name), \ 107 .command = _command, \ 108 }; \ 109 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 110 &trackpoint_attr_##_name, \ 111 trackpoint_show_int_attr, trackpoint_set_int_attr) 112 113 static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data, 114 const char *buf, size_t count) 115 { 116 struct trackpoint_data *tp = psmouse->private; 117 struct trackpoint_attr_data *attr = data; 118 unsigned char *field = (unsigned char *)((char *)tp + attr->field_offset); 119 unsigned long value; 120 char *rest; 121 122 value = simple_strtoul(buf, &rest, 10); 123 if (*rest || value > 1) 124 return -EINVAL; 125 126 if (attr->inverted) 127 value = !value; 128 129 if (*field != value) { 130 *field = value; 131 trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask); 132 } 133 134 return count; 135 } 136 137 138 #define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv) \ 139 static struct trackpoint_attr_data trackpoint_attr_##_name = { \ 140 .field_offset = offsetof(struct trackpoint_data, _name), \ 141 .command = _command, \ 142 .mask = _mask, \ 143 .inverted = _inv, \ 144 }; \ 145 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 146 &trackpoint_attr_##_name, \ 147 trackpoint_show_int_attr, trackpoint_set_bit_attr) 148 149 TRACKPOINT_INT_ATTR(sensitivity, TP_SENS); 150 TRACKPOINT_INT_ATTR(speed, TP_SPEED); 151 TRACKPOINT_INT_ATTR(inertia, TP_INERTIA); 152 TRACKPOINT_INT_ATTR(reach, TP_REACH); 153 TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS); 154 TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG); 155 TRACKPOINT_INT_ATTR(thresh, TP_THRESH); 156 TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH); 157 TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME); 158 TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV); 159 160 TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0); 161 TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0); 162 TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1); 163 164 static struct attribute *trackpoint_attrs[] = { 165 &psmouse_attr_sensitivity.dattr.attr, 166 &psmouse_attr_speed.dattr.attr, 167 &psmouse_attr_inertia.dattr.attr, 168 &psmouse_attr_reach.dattr.attr, 169 &psmouse_attr_draghys.dattr.attr, 170 &psmouse_attr_mindrag.dattr.attr, 171 &psmouse_attr_thresh.dattr.attr, 172 &psmouse_attr_upthresh.dattr.attr, 173 &psmouse_attr_ztime.dattr.attr, 174 &psmouse_attr_jenks.dattr.attr, 175 &psmouse_attr_press_to_select.dattr.attr, 176 &psmouse_attr_skipback.dattr.attr, 177 &psmouse_attr_ext_dev.dattr.attr, 178 NULL 179 }; 180 181 static struct attribute_group trackpoint_attr_group = { 182 .attrs = trackpoint_attrs, 183 }; 184 185 static int trackpoint_start_protocol(struct psmouse *psmouse, unsigned char *firmware_id) 186 { 187 unsigned char param[2] = { 0 }; 188 189 if (ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID))) 190 return -1; 191 192 if (param[0] != TP_MAGIC_IDENT) 193 return -1; 194 195 if (firmware_id) 196 *firmware_id = param[1]; 197 198 return 0; 199 } 200 201 static int trackpoint_sync(struct psmouse *psmouse) 202 { 203 struct trackpoint_data *tp = psmouse->private; 204 unsigned char toggle; 205 206 /* Disable features that may make device unusable with this driver */ 207 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, &toggle); 208 if (toggle & TP_MASK_TWOHAND) 209 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, TP_MASK_TWOHAND); 210 211 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, &toggle); 212 if (toggle & TP_MASK_SOURCE_TAG) 213 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, TP_MASK_SOURCE_TAG); 214 215 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_MB, &toggle); 216 if (toggle & TP_MASK_MB) 217 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_MB, TP_MASK_MB); 218 219 /* Push the config to the device */ 220 trackpoint_write(&psmouse->ps2dev, TP_SENS, tp->sensitivity); 221 trackpoint_write(&psmouse->ps2dev, TP_INERTIA, tp->inertia); 222 trackpoint_write(&psmouse->ps2dev, TP_SPEED, tp->speed); 223 224 trackpoint_write(&psmouse->ps2dev, TP_REACH, tp->reach); 225 trackpoint_write(&psmouse->ps2dev, TP_DRAGHYS, tp->draghys); 226 trackpoint_write(&psmouse->ps2dev, TP_MINDRAG, tp->mindrag); 227 228 trackpoint_write(&psmouse->ps2dev, TP_THRESH, tp->thresh); 229 trackpoint_write(&psmouse->ps2dev, TP_UP_THRESH, tp->upthresh); 230 231 trackpoint_write(&psmouse->ps2dev, TP_Z_TIME, tp->ztime); 232 trackpoint_write(&psmouse->ps2dev, TP_JENKS_CURV, tp->jenks); 233 234 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_PTSON, &toggle); 235 if (((toggle & TP_MASK_PTSON) == TP_MASK_PTSON) != tp->press_to_select) 236 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_PTSON, TP_MASK_PTSON); 237 238 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, &toggle); 239 if (((toggle & TP_MASK_SKIPBACK) == TP_MASK_SKIPBACK) != tp->skipback) 240 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK); 241 242 trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, &toggle); 243 if (((toggle & TP_MASK_EXT_DEV) == TP_MASK_EXT_DEV) != tp->ext_dev) 244 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV); 245 246 return 0; 247 } 248 249 static void trackpoint_defaults(struct trackpoint_data *tp) 250 { 251 tp->press_to_select = TP_DEF_PTSON; 252 tp->sensitivity = TP_DEF_SENS; 253 tp->speed = TP_DEF_SPEED; 254 tp->reach = TP_DEF_REACH; 255 256 tp->draghys = TP_DEF_DRAGHYS; 257 tp->mindrag = TP_DEF_MINDRAG; 258 259 tp->thresh = TP_DEF_THRESH; 260 tp->upthresh = TP_DEF_UP_THRESH; 261 262 tp->ztime = TP_DEF_Z_TIME; 263 tp->jenks = TP_DEF_JENKS_CURV; 264 265 tp->inertia = TP_DEF_INERTIA; 266 tp->skipback = TP_DEF_SKIPBACK; 267 tp->ext_dev = TP_DEF_EXT_DEV; 268 } 269 270 static void trackpoint_disconnect(struct psmouse *psmouse) 271 { 272 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group); 273 274 kfree(psmouse->private); 275 psmouse->private = NULL; 276 } 277 278 static int trackpoint_reconnect(struct psmouse *psmouse) 279 { 280 if (trackpoint_start_protocol(psmouse, NULL)) 281 return -1; 282 283 if (trackpoint_sync(psmouse)) 284 return -1; 285 286 return 0; 287 } 288 289 int trackpoint_detect(struct psmouse *psmouse, int set_properties) 290 { 291 struct trackpoint_data *priv; 292 struct ps2dev *ps2dev = &psmouse->ps2dev; 293 unsigned char firmware_id; 294 unsigned char button_info; 295 int error; 296 297 if (trackpoint_start_protocol(psmouse, &firmware_id)) 298 return -1; 299 300 if (!set_properties) 301 return 0; 302 303 if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) { 304 printk(KERN_WARNING "trackpoint.c: failed to get extended button data\n"); 305 button_info = 0; 306 } 307 308 psmouse->private = priv = kzalloc(sizeof(struct trackpoint_data), GFP_KERNEL); 309 if (!priv) 310 return -1; 311 312 psmouse->vendor = "IBM"; 313 psmouse->name = "TrackPoint"; 314 315 psmouse->reconnect = trackpoint_reconnect; 316 psmouse->disconnect = trackpoint_disconnect; 317 318 trackpoint_defaults(priv); 319 trackpoint_sync(psmouse); 320 321 error = sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group); 322 if (error) { 323 printk(KERN_ERR 324 "trackpoint.c: failed to create sysfs attributes, error: %d\n", 325 error); 326 kfree(priv); 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 } 335 336