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