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/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, bool 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