Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522// SPDX-License-Identifier: GPL-2.0-only/* * Stephen Evanchik <evanchsa@gmail.com> * * Trademarks are the property of their respective owners. */
#include <linux/array_size.h>#include <linux/slab.h>#include <linux/delay.h>#include <linux/serio.h>#include <linux/module.h>#include <linux/input.h>#include <linux/libps2.h>#include <linux/proc_fs.h>#include <linux/string.h>#include <linux/uaccess.h>#include "psmouse.h"#include "trackpoint.h"
static const char * const trackpoint_variants[] = { [TP_VARIANT_IBM] = "IBM", [TP_VARIANT_ALPS] = "ALPS", [TP_VARIANT_ELAN] = "Elan", [TP_VARIANT_NXP] = "NXP", [TP_VARIANT_JYT_SYNAPTICS] = "JYT_Synaptics", [TP_VARIANT_SYNAPTICS] = "Synaptics",};
/* * Power-on Reset: Resets all trackpoint parameters, including RAM values, * to defaults. * Returns zero on success, non-zero on failure. */static int trackpoint_power_on_reset(struct ps2dev *ps2dev){ u8 param[2] = { TP_POR }; int err;
err = ps2_command(ps2dev, param, MAKE_PS2_CMD(1, 2, TP_COMMAND)); if (err) return err;
/* Check for success response -- 0xAA00 */ if (param[0] != 0xAA || param[1] != 0x00) return -ENODEV;
return 0;}
/* * Device IO: read, write and toggle bit */static int trackpoint_read(struct ps2dev *ps2dev, u8 loc, u8 *results){ results[0] = loc;
return ps2_command(ps2dev, results, MAKE_PS2_CMD(1, 1, TP_COMMAND));}
static int trackpoint_write(struct ps2dev *ps2dev, u8 loc, u8 val){ u8 param[3] = { TP_WRITE_MEM, loc, val };
return ps2_command(ps2dev, param, MAKE_PS2_CMD(3, 0, TP_COMMAND));}
static int trackpoint_toggle_bit(struct ps2dev *ps2dev, u8 loc, u8 mask){ u8 param[3] = { TP_TOGGLE, loc, mask };
/* Bad things will happen if the loc param isn't in this range */ if (loc < 0x20 || loc >= 0x2F) return -EINVAL;
return ps2_command(ps2dev, param, MAKE_PS2_CMD(3, 0, TP_COMMAND));}
static int trackpoint_update_bit(struct ps2dev *ps2dev, u8 loc, u8 mask, u8 value){ int retval; u8 data;
retval = trackpoint_read(ps2dev, loc, &data); if (retval) return retval;
if (((data & mask) == mask) != !!value) retval = trackpoint_toggle_bit(ps2dev, loc, mask);
return retval;}
/* * Trackpoint-specific attributes */struct trackpoint_attr_data { size_t field_offset; u8 command; u8 mask; bool inverted; u8 power_on_default;};
static ssize_t trackpoint_show_int_attr(struct psmouse *psmouse, void *data, char *buf){ struct trackpoint_data *tp = psmouse->private; struct trackpoint_attr_data *attr = data; u8 value = *(u8 *)((void *)tp + attr->field_offset);
if (attr->inverted) value = !value;
return sprintf(buf, "%u\n", value);}
static ssize_t trackpoint_set_int_attr(struct psmouse *psmouse, void *data, const char *buf, size_t count){ struct trackpoint_data *tp = psmouse->private; struct trackpoint_attr_data *attr = data; u8 *field = (void *)tp + attr->field_offset; u8 value; int err;
err = kstrtou8(buf, 10, &value); if (err) return err;
*field = value; err = trackpoint_write(&psmouse->ps2dev, attr->command, value);
return err ?: count;}
#define TRACKPOINT_INT_ATTR(_name, _command, _default) \ static struct trackpoint_attr_data trackpoint_attr_##_name = { \ .field_offset = offsetof(struct trackpoint_data, _name), \ .command = _command, \ .power_on_default = _default, \ }; \ PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ &trackpoint_attr_##_name, \ trackpoint_show_int_attr, trackpoint_set_int_attr)
static ssize_t trackpoint_set_bit_attr(struct psmouse *psmouse, void *data, const char *buf, size_t count){ struct trackpoint_data *tp = psmouse->private; struct trackpoint_attr_data *attr = data; bool *field = (void *)tp + attr->field_offset; bool value; int err;
err = kstrtobool(buf, &value); if (err) return err;
if (attr->inverted) value = !value;
if (*field != value) { *field = value; err = trackpoint_toggle_bit(&psmouse->ps2dev, attr->command, attr->mask); }
return err ?: count;}
#define TRACKPOINT_BIT_ATTR(_name, _command, _mask, _inv, _default) \static struct trackpoint_attr_data trackpoint_attr_##_name = { \ .field_offset = offsetof(struct trackpoint_data, \ _name), \ .command = _command, \ .mask = _mask, \ .inverted = _inv, \ .power_on_default = _default, \ }; \PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ &trackpoint_attr_##_name, \ trackpoint_show_int_attr, trackpoint_set_bit_attr)
TRACKPOINT_INT_ATTR(sensitivity, TP_SENS, TP_DEF_SENS);TRACKPOINT_INT_ATTR(speed, TP_SPEED, TP_DEF_SPEED);TRACKPOINT_INT_ATTR(inertia, TP_INERTIA, TP_DEF_INERTIA);TRACKPOINT_INT_ATTR(reach, TP_REACH, TP_DEF_REACH);TRACKPOINT_INT_ATTR(draghys, TP_DRAGHYS, TP_DEF_DRAGHYS);TRACKPOINT_INT_ATTR(mindrag, TP_MINDRAG, TP_DEF_MINDRAG);TRACKPOINT_INT_ATTR(thresh, TP_THRESH, TP_DEF_THRESH);TRACKPOINT_INT_ATTR(upthresh, TP_UP_THRESH, TP_DEF_UP_THRESH);TRACKPOINT_INT_ATTR(ztime, TP_Z_TIME, TP_DEF_Z_TIME);TRACKPOINT_INT_ATTR(jenks, TP_JENKS_CURV, TP_DEF_JENKS_CURV);TRACKPOINT_INT_ATTR(drift_time, TP_DRIFT_TIME, TP_DEF_DRIFT_TIME);
TRACKPOINT_BIT_ATTR(press_to_select, TP_TOGGLE_PTSON, TP_MASK_PTSON, false, TP_DEF_PTSON);TRACKPOINT_BIT_ATTR(skipback, TP_TOGGLE_SKIPBACK, TP_MASK_SKIPBACK, false, TP_DEF_SKIPBACK);TRACKPOINT_BIT_ATTR(ext_dev, TP_TOGGLE_EXT_DEV, TP_MASK_EXT_DEV, true, TP_DEF_EXT_DEV);
static bool trackpoint_is_attr_available(struct psmouse *psmouse, struct attribute *attr){ struct trackpoint_data *tp = psmouse->private;
return tp->variant_id == TP_VARIANT_IBM || attr == &psmouse_attr_sensitivity.dattr.attr || attr == &psmouse_attr_press_to_select.dattr.attr;}
static umode_t trackpoint_is_attr_visible(struct kobject *kobj, struct attribute *attr, int n){ struct device *dev = kobj_to_dev(kobj); struct serio *serio = to_serio_port(dev); struct psmouse *psmouse = psmouse_from_serio(serio);
return trackpoint_is_attr_available(psmouse, attr) ? attr->mode : 0;}
static struct attribute *trackpoint_attrs[] = { &psmouse_attr_sensitivity.dattr.attr, &psmouse_attr_speed.dattr.attr, &psmouse_attr_inertia.dattr.attr, &psmouse_attr_reach.dattr.attr, &psmouse_attr_draghys.dattr.attr, &psmouse_attr_mindrag.dattr.attr, &psmouse_attr_thresh.dattr.attr, &psmouse_attr_upthresh.dattr.attr, &psmouse_attr_ztime.dattr.attr, &psmouse_attr_jenks.dattr.attr, &psmouse_attr_drift_time.dattr.attr, &psmouse_attr_press_to_select.dattr.attr, &psmouse_attr_skipback.dattr.attr, &psmouse_attr_ext_dev.dattr.attr, NULL};
static struct attribute_group trackpoint_attr_group = { .is_visible = trackpoint_is_attr_visible, .attrs = trackpoint_attrs,};
#define TRACKPOINT_UPDATE(_power_on, _psmouse, _tp, _name) \do { \ struct trackpoint_attr_data *_attr = &trackpoint_attr_##_name; \ \ if ((!_power_on || _tp->_name != _attr->power_on_default) && \ trackpoint_is_attr_available(_psmouse, \ &psmouse_attr_##_name.dattr.attr)) { \ if (!_attr->mask) \ trackpoint_write(&_psmouse->ps2dev, \ _attr->command, _tp->_name); \ else \ trackpoint_update_bit(&_psmouse->ps2dev, \ _attr->command, _attr->mask, \ _tp->_name); \ } \} while (0)
#define TRACKPOINT_SET_POWER_ON_DEFAULT(_tp, _name) \do { \ _tp->_name = trackpoint_attr_##_name.power_on_default; \} while (0)
static int trackpoint_start_protocol(struct psmouse *psmouse, u8 *variant_id, u8 *firmware_id){ u8 param[2] = { 0 }; int error;
error = ps2_command(&psmouse->ps2dev, param, MAKE_PS2_CMD(0, 2, TP_READ_ID)); if (error) return error;
switch (param[0]) { case TP_VARIANT_IBM: case TP_VARIANT_ALPS: case TP_VARIANT_ELAN: case TP_VARIANT_NXP: case TP_VARIANT_JYT_SYNAPTICS: case TP_VARIANT_SYNAPTICS: if (variant_id) *variant_id = param[0]; if (firmware_id) *firmware_id = param[1]; return 0; }
return -ENODEV;}
/* * Write parameters to trackpad. * in_power_on_state: Set to true if TP is in default / power-on state (ex. if * power-on reset was run). If so, values will only be * written to TP if they differ from power-on default. */static int trackpoint_sync(struct psmouse *psmouse, bool in_power_on_state){ struct trackpoint_data *tp = psmouse->private;
if (!in_power_on_state && tp->variant_id == TP_VARIANT_IBM) { /* * Disable features that may make device unusable * with this driver. */ trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_TWOHAND, TP_MASK_TWOHAND, TP_DEF_TWOHAND);
trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_SOURCE_TAG, TP_MASK_SOURCE_TAG, TP_DEF_SOURCE_TAG);
trackpoint_update_bit(&psmouse->ps2dev, TP_TOGGLE_MB, TP_MASK_MB, TP_DEF_MB); }
/* * These properties can be changed in this driver. Only * configure them if the values are non-default or if the TP is in * an unknown state. */ TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, sensitivity); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, inertia); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, speed); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, reach); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, draghys); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, mindrag); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, thresh); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, upthresh); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ztime); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, jenks); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, drift_time);
/* toggles */ TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, press_to_select); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, skipback); TRACKPOINT_UPDATE(in_power_on_state, psmouse, tp, ext_dev);
return 0;}
static void trackpoint_defaults(struct trackpoint_data *tp){ TRACKPOINT_SET_POWER_ON_DEFAULT(tp, sensitivity); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, speed); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, reach); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, draghys); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, mindrag); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, thresh); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, upthresh); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ztime); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, jenks); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, drift_time); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, inertia);
/* toggles */ TRACKPOINT_SET_POWER_ON_DEFAULT(tp, press_to_select); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, skipback); TRACKPOINT_SET_POWER_ON_DEFAULT(tp, ext_dev);}
static void trackpoint_disconnect(struct psmouse *psmouse){ device_remove_group(&psmouse->ps2dev.serio->dev, &trackpoint_attr_group);
kfree(psmouse->private); psmouse->private = NULL;}
static int trackpoint_reconnect(struct psmouse *psmouse){ struct trackpoint_data *tp = psmouse->private; int error; bool was_reset;
error = trackpoint_start_protocol(psmouse, NULL, NULL); if (error) return error;
was_reset = tp->variant_id == TP_VARIANT_IBM && trackpoint_power_on_reset(&psmouse->ps2dev) == 0;
error = trackpoint_sync(psmouse, was_reset); if (error) return error;
return 0;}
/* List of known incapable device PNP IDs */static const char * const dt_incompatible_devices[] = { "LEN0304", "LEN0306", "LEN0317", "LEN031A", "LEN031B", "LEN031C", "LEN031D",};
/* * Checks if it's a doubletap capable device. * The PNP ID format is "PNP: LEN030d PNP0f13". */static bool trackpoint_is_dt_capable(const char *pnp_id){ size_t i;
if (!pnp_id) return false;
/* Must start with "PNP: LEN03" */ if (!strstarts(pnp_id, "PNP: LEN03")) return false;
/* Ensure enough length before comparing */ if (strlen(pnp_id) < 12) return false;
/* Check deny-list */ for (i = 0; i < ARRAY_SIZE(dt_incompatible_devices); i++) { if (!strncmp(pnp_id + 5, dt_incompatible_devices[i], 7)) return false; } return true;}
int trackpoint_detect(struct psmouse *psmouse, bool set_properties){ struct ps2dev *ps2dev = &psmouse->ps2dev; struct trackpoint_data *tp; u8 variant_id; u8 firmware_id; u8 button_info; int error;
error = trackpoint_start_protocol(psmouse, &variant_id, &firmware_id); if (error) return error;
if (!set_properties) return 0;
tp = kzalloc_obj(*tp); if (!tp) return -ENOMEM;
trackpoint_defaults(tp); tp->variant_id = variant_id; tp->firmware_id = firmware_id;
psmouse->private = tp;
psmouse->vendor = trackpoint_variants[variant_id]; psmouse->name = "TrackPoint";
psmouse->reconnect = trackpoint_reconnect; psmouse->disconnect = trackpoint_disconnect;
if (variant_id != TP_VARIANT_IBM) { /* Newer variants do not support extended button query. */ button_info = 0x33; } else { error = trackpoint_read(ps2dev, TP_EXT_BTN, &button_info); if (error) { psmouse_warn(psmouse, "failed to get extended button data, assuming 3 buttons\n"); button_info = 0x33; } else if (!button_info) { psmouse_warn(psmouse, "got 0 in extended button data, assuming 3 buttons\n"); button_info = 0x33; } }
if ((button_info & 0x0f) >= 3) input_set_capability(psmouse->dev, EV_KEY, BTN_MIDDLE);
__set_bit(INPUT_PROP_POINTER, psmouse->dev->propbit); __set_bit(INPUT_PROP_POINTING_STICK, psmouse->dev->propbit);
if (variant_id != TP_VARIANT_IBM || trackpoint_power_on_reset(ps2dev) != 0) { /* * Write defaults to TP if we did not reset the trackpoint. */ trackpoint_sync(psmouse, false); }
error = device_add_group(&ps2dev->serio->dev, &trackpoint_attr_group); if (error) { psmouse_err(psmouse, "failed to create sysfs attributes, error: %d\n", error); kfree(psmouse->private); psmouse->private = NULL; return -1; }
psmouse_info(psmouse, "%s TrackPoint firmware: 0x%02x, buttons: %d/%d\n", psmouse->vendor, firmware_id, (button_info & 0xf0) >> 4, button_info & 0x0f);
if (trackpoint_is_dt_capable(ps2dev->serio->firmware_id)) { error = trackpoint_write(ps2dev, TP_DOUBLETAP, TP_DOUBLETAP_ENABLE); if (error) psmouse_warn(psmouse, "Failed to enable doubletap: %d\n", error); }
return 0;}