drivers/input/mouse/trackpoint.c

   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/moduleparam.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 long value;
  93         char *rest;
  94
  95         value = simple_strtoul(buf, &rest, 10);
  96         if (*rest || value > 255)
  97                 return -EINVAL;
  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 long value;
 121         char *rest;
 122
 123         value = simple_strtoul(buf, &rest, 10);
 124         if (*rest || value > 1)
 125                 return -EINVAL;
 126
 127         if (attr->inverted)
 128                 value = !value;
 129
 130         if (*field != value) {
 131                 *field = value;
 132                 trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask);
 133         }
 134
 135         return count;
 136 }
 137
 138
 139 #define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv)                               \
 140         static struct trackpoint_attr_data trackpoint_attr_##_name = {          \
 141                 .field_offset   = offsetof(struct trackpoint_data, _name),      \
 142                 .command        = _command,                                     \
 143                 .mask           = _mask,                                        \
 144                 .inverted       = _inv,                                         \
 145         };                                                                      \
 146         PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO,                           \
 147                             &trackpoint_attr_##_name,                           \
 148                             trackpoint_show_int_attr, trackpoint_set_bit_attr)
 149
 150 TRACKPOINT_INT_ATTR(sensitivity, TP_SENS);
 151 TRACKPOINT_INT_ATTR(speed, TP_SPEED);
 152 TRACKPOINT_INT_ATTR(inertia, TP_INERTIA);
 153 TRACKPOINT_INT_ATTR(reach, TP_REACH);
 154 TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS);
 155 TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG);
 156 TRACKPOINT_INT_ATTR(thresh, TP_THRESH);
 157 TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH);
 158 TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME);
 159 TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV);
 160
 161 TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, 0);
 162 TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, 0);
 163 TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, 1);
 164
 165 static struct attribute *trackpoint_attrs[] = {
 166         &psmouse_attr_sensitivity.dattr.attr,
 167         &psmouse_attr_speed.dattr.attr,
 168         &psmouse_attr_inertia.dattr.attr,
 169         &psmouse_attr_reach.dattr.attr,
 170         &psmouse_attr_draghys.dattr.attr,
 171         &psmouse_attr_mindrag.dattr.attr,
 172         &psmouse_attr_thresh.dattr.attr,
 173         &psmouse_attr_upthresh.dattr.attr,
 174         &psmouse_attr_ztime.dattr.attr,
 175         &psmouse_attr_jenks.dattr.attr,
 176         &psmouse_attr_press_to_select.dattr.attr,
 177         &psmouse_attr_skipback.dattr.attr,
 178         &psmouse_attr_ext_dev.dattr.attr,
 179         NULL
 180 };
 181
 182 static struct attribute_group trackpoint_attr_group = {
 183         .attrs = trackpoint_attrs,
 184 };
 185
 186 static void trackpoint_disconnect(struct psmouse *psmouse)
 187 {
 188         sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group);
 189
 190         kfree(psmouse->private);
 191         psmouse->private = NULL;
 192 }
 193
 194 static int trackpoint_sync(struct psmouse *psmouse)
 195 {
 196         unsigned char toggle;
 197         struct trackpoint_data *tp = psmouse->private;
 198
 199         if (!tp)
 200                 return -1;
 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 int trackpoint_detect(struct psmouse *psmouse, int set_properties)
 267 {
 268         struct trackpoint_data *priv;
 269         struct ps2dev *ps2dev = &psmouse->ps2dev;
 270         unsigned char firmware_id;
 271         unsigned char button_info;
 272         unsigned char param[2];
 273
 274         param[0] = param[1] = 0;
 275
 276         if (ps2_command(ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
 277                 return -1;
 278
 279         if (param[0] != TP_MAGIC_IDENT)
 280                 return -1;
 281
 282         if (!set_properties)
 283                 return 0;
 284
 285         firmware_id = param[1];
 286
 287         if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) {
 288                 printk(KERN_WARNING "trackpoint.c: failed to get extended button data\n");
 289                 button_info = 0;
 290         }
 291
 292         psmouse->private = priv = kcalloc(1, sizeof(struct trackpoint_data), GFP_KERNEL);
 293         if (!priv)
 294                 return -1;
 295
 296         psmouse->vendor = "IBM";
 297         psmouse->name = "TrackPoint";
 298
 299         psmouse->reconnect = trackpoint_sync;
 300         psmouse->disconnect = trackpoint_disconnect;
 301
 302         trackpoint_defaults(priv);
 303         trackpoint_sync(psmouse);
 304
 305         sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group);
 306
 307         printk(KERN_INFO "IBM TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
 308                 firmware_id, (button_info & 0xf0) >> 4, button_info & 0x0f);
 309
 310         return 0;
 311 }
 312