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 PSMOUSE_DEFINE_ATTR(sensitivity);
  23 PSMOUSE_DEFINE_ATTR(speed);
  24 PSMOUSE_DEFINE_ATTR(inertia);
  25 PSMOUSE_DEFINE_ATTR(reach);
  26 PSMOUSE_DEFINE_ATTR(draghys);
  27 PSMOUSE_DEFINE_ATTR(mindrag);
  28 PSMOUSE_DEFINE_ATTR(thresh);
  29 PSMOUSE_DEFINE_ATTR(upthresh);
  30 PSMOUSE_DEFINE_ATTR(ztime);
  31 PSMOUSE_DEFINE_ATTR(jenks);
  32 PSMOUSE_DEFINE_ATTR(press_to_select);
  33 PSMOUSE_DEFINE_ATTR(skipback);
  34 PSMOUSE_DEFINE_ATTR(ext_dev);
  35
  36 #define MAKE_ATTR_READ(_item) \
  37         static ssize_t psmouse_attr_show_##_item(struct psmouse *psmouse, char *buf) \
  38         { \
  39                 struct trackpoint_data *tp = psmouse->private; \
  40                 return sprintf(buf, "%lu\n", (unsigned long)tp->_item); \
  41         }
  42
  43 #define MAKE_ATTR_WRITE(_item, command) \
  44         static ssize_t psmouse_attr_set_##_item(struct psmouse *psmouse, const char *buf, size_t count) \
  45         { \
  46                 char *rest; \
  47                 unsigned long value; \
  48                 struct trackpoint_data *tp = psmouse->private; \
  49                 value = simple_strtoul(buf, &rest, 10); \
  50                 if (*rest) \
  51                         return -EINVAL; \
  52                 tp->_item = value; \
  53                 trackpoint_write(&psmouse->ps2dev, command, tp->_item); \
  54                 return count; \
  55         }
  56
  57 #define MAKE_ATTR_TOGGLE(_item, command, mask) \
  58         static ssize_t psmouse_attr_set_##_item(struct psmouse *psmouse, const char *buf, size_t count) \
  59         { \
  60                 unsigned char toggle; \
  61                 struct trackpoint_data *tp = psmouse->private; \
  62                 toggle = (buf[0] == '1') ? 1 : 0; \
  63                 if (toggle != tp->_item) { \
  64                         tp->_item = toggle; \
  65                         trackpoint_toggle_bit(&psmouse->ps2dev, command, mask); \
  66                 } \
  67                 return count; \
  68         }
  69
  70 /*
  71  * Device IO: read, write and toggle bit
  72  */
  73 static int trackpoint_read(struct ps2dev *ps2dev, unsigned char loc, unsigned char *results)
  74 {
  75         if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
  76             ps2_command(ps2dev, results, MAKE_PS2_CMD(0, 1, loc))) {
  77                 return -1;
  78         }
  79
  80         return 0;
  81 }
  82
  83 static int trackpoint_write(struct ps2dev *ps2dev, unsigned char loc, unsigned char val)
  84 {
  85         if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
  86             ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_WRITE_MEM)) ||
  87             ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
  88             ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, val))) {
  89                 return -1;
  90         }
  91
  92         return 0;
  93 }
  94
  95 static int trackpoint_toggle_bit(struct ps2dev *ps2dev, unsigned char loc, unsigned char mask)
  96 {
  97         /* Bad things will happen if the loc param isn't in this range */
  98         if (loc < 0x20 || loc >= 0x2F)
  99                 return -1;
 100
 101         if (ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_COMMAND)) ||
 102             ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, TP_TOGGLE)) ||
 103             ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, loc)) ||
 104             ps2_command(ps2dev, NULL, MAKE_PS2_CMD(0, 0, mask))) {
 105                 return -1;
 106         }
 107
 108         return 0;
 109 }
 110
 111 MAKE_ATTR_WRITE(sensitivity, TP_SENS);
 112 MAKE_ATTR_READ(sensitivity);
 113
 114 MAKE_ATTR_WRITE(speed, TP_SPEED);
 115 MAKE_ATTR_READ(speed);
 116
 117 MAKE_ATTR_WRITE(inertia, TP_INERTIA);
 118 MAKE_ATTR_READ(inertia);
 119
 120 MAKE_ATTR_WRITE(reach, TP_REACH);
 121 MAKE_ATTR_READ(reach);
 122
 123 MAKE_ATTR_WRITE(draghys, TP_DRAGHYS);
 124 MAKE_ATTR_READ(draghys);
 125
 126 MAKE_ATTR_WRITE(mindrag, TP_MINDRAG);
 127 MAKE_ATTR_READ(mindrag);
 128
 129 MAKE_ATTR_WRITE(thresh, TP_THRESH);
 130 MAKE_ATTR_READ(thresh);
 131
 132 MAKE_ATTR_WRITE(upthresh, TP_UP_THRESH);
 133 MAKE_ATTR_READ(upthresh);
 134
 135 MAKE_ATTR_WRITE(ztime, TP_Z_TIME);
 136 MAKE_ATTR_READ(ztime);
 137
 138 MAKE_ATTR_WRITE(jenks, TP_JENKS_CURV);
 139 MAKE_ATTR_READ(jenks);
 140
 141 MAKE_ATTR_TOGGLE(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON);
 142 MAKE_ATTR_READ(press_to_select);
 143
 144 MAKE_ATTR_TOGGLE(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK);
 145 MAKE_ATTR_READ(skipback);
 146
 147 MAKE_ATTR_TOGGLE(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV);
 148 MAKE_ATTR_READ(ext_dev);
 149
 150 static struct attribute *trackpoint_attrs[] = {
 151         &psmouse_attr_sensitivity.attr,
 152         &psmouse_attr_speed.attr,
 153         &psmouse_attr_inertia.attr,
 154         &psmouse_attr_reach.attr,
 155         &psmouse_attr_draghys.attr,
 156         &psmouse_attr_mindrag.attr,
 157         &psmouse_attr_thresh.attr,
 158         &psmouse_attr_upthresh.attr,
 159         &psmouse_attr_ztime.attr,
 160         &psmouse_attr_jenks.attr,
 161         &psmouse_attr_press_to_select.attr,
 162         &psmouse_attr_skipback.attr,
 163         &psmouse_attr_ext_dev.attr,
 164         NULL
 165 };
 166
 167 static struct attribute_group trackpoint_attr_group = {
 168         .attrs = trackpoint_attrs,
 169 };
 170
 171 static void trackpoint_disconnect(struct psmouse *psmouse)
 172 {
 173         sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &trackpoint_attr_group);
 174
 175         kfree(psmouse->private);
 176         psmouse->private = NULL;
 177 }
 178
 179 static int trackpoint_sync(struct psmouse *psmouse)
 180 {
 181         unsigned char toggle;
 182         struct trackpoint_data *tp = psmouse->private;
 183
 184         if (!tp)
 185                 return -1;
 186
 187         /* Disable features that may make device unusable with this driver */
 188         trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, &toggle);
 189         if (toggle & TP_MASK_TWOHAND)
 190                 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, TP_MASK_TWOHAND);
 191
 192         trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, &toggle);
 193         if (toggle & TP_MASK_SOURCE_TAG)
 194                 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, TP_MASK_SOURCE_TAG);
 195
 196         trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_MB, &toggle);
 197         if (toggle & TP_MASK_MB)
 198                 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_MB, TP_MASK_MB);
 199
 200         /* Push the config to the device */
 201         trackpoint_write(&psmouse->ps2dev, TP_SENS, tp->sensitivity);
 202         trackpoint_write(&psmouse->ps2dev, TP_INERTIA, tp->inertia);
 203         trackpoint_write(&psmouse->ps2dev, TP_SPEED, tp->speed);
 204
 205         trackpoint_write(&psmouse->ps2dev, TP_REACH, tp->reach);
 206         trackpoint_write(&psmouse->ps2dev, TP_DRAGHYS, tp->draghys);
 207         trackpoint_write(&psmouse->ps2dev, TP_MINDRAG, tp->mindrag);
 208
 209         trackpoint_write(&psmouse->ps2dev, TP_THRESH, tp->thresh);
 210         trackpoint_write(&psmouse->ps2dev, TP_UP_THRESH, tp->upthresh);
 211
 212         trackpoint_write(&psmouse->ps2dev, TP_Z_TIME, tp->ztime);
 213         trackpoint_write(&psmouse->ps2dev, TP_JENKS_CURV, tp->jenks);
 214
 215         trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_PTSON, &toggle);
 216         if (((toggle & TP_MASK_PTSON) == TP_MASK_PTSON) != tp->press_to_select)
 217                  trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_PTSON, TP_MASK_PTSON);
 218
 219         trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, &toggle);
 220         if (((toggle & TP_MASK_SKIPBACK) == TP_MASK_SKIPBACK) != tp->skipback)
 221                 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK);
 222
 223         trackpoint_read(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, &toggle);
 224         if (((toggle & TP_MASK_EXT_DEV) == TP_MASK_EXT_DEV) != tp->ext_dev)
 225                 trackpoint_toggle_bit(&psmouse->ps2dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV);
 226
 227         return 0;
 228 }
 229
 230 static void trackpoint_defaults(struct trackpoint_data *tp)
 231 {
 232         tp->press_to_select = TP_DEF_PTSON;
 233         tp->sensitivity = TP_DEF_SENS;
 234         tp->speed = TP_DEF_SPEED;
 235         tp->reach = TP_DEF_REACH;
 236
 237         tp->draghys = TP_DEF_DRAGHYS;
 238         tp->mindrag = TP_DEF_MINDRAG;
 239
 240         tp->thresh = TP_DEF_THRESH;
 241         tp->upthresh = TP_DEF_UP_THRESH;
 242
 243         tp->ztime = TP_DEF_Z_TIME;
 244         tp->jenks = TP_DEF_JENKS_CURV;
 245
 246         tp->inertia = TP_DEF_INERTIA;
 247         tp->skipback = TP_DEF_SKIPBACK;
 248         tp->ext_dev = TP_DEF_EXT_DEV;
 249 }
 250
 251 int trackpoint_detect(struct psmouse *psmouse, int set_properties)
 252 {
 253         struct trackpoint_data *priv;
 254         struct ps2dev *ps2dev = &psmouse->ps2dev;
 255         unsigned char firmware_id;
 256         unsigned char button_info;
 257         unsigned char param[2];
 258
 259         param[0] = param[1] = 0;
 260
 261         if (ps2_command(ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)))
 262                 return -1;
 263
 264         if (param[0] != TP_MAGIC_IDENT)
 265                 return -1;
 266
 267         if (!set_properties)
 268                 return 0;
 269
 270         firmware_id = param[1];
 271
 272         if (trackpoint_read(&psmouse->ps2dev, TP_EXT_BTN, &button_info)) {
 273                 printk(KERN_WARNING "trackpoint.c: failed to get extended button data\n");
 274                 button_info = 0;
 275         }
 276
 277         psmouse->private = priv = kcalloc(1, sizeof(struct trackpoint_data), GFP_KERNEL);
 278         if (!priv)
 279                 return -1;
 280
 281         psmouse->vendor = "IBM";
 282         psmouse->name = "TrackPoint";
 283
 284         psmouse->reconnect = trackpoint_sync;
 285         psmouse->disconnect = trackpoint_disconnect;
 286
 287         trackpoint_defaults(priv);
 288         trackpoint_sync(psmouse);
 289
 290         sysfs_create_group(&ps2dev->serio->dev.kobj, &trackpoint_attr_group);
 291
 292         printk(KERN_INFO "IBM TrackPoint firmware: 0x%02x, buttons: %d/%d\n",
 293                 firmware_id, (button_info & 0xf0) >> 4, button_info & 0x0f);
 294
 295         return 0;
 296 }
 297