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
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