diff options
Diffstat (limited to 'drivers/input/mouse/trackpoint.c')
| -rw-r--r-- | drivers/input/mouse/trackpoint.c | 475 |
1 files changed, 475 insertions, 0 deletions
diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c new file mode 100644 index 0000000000..5f6643b69a --- /dev/null +++ b/drivers/input/mouse/trackpoint.c @@ -0,0 +1,475 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Stephen Evanchik <evanchsa@gmail.com> + * + * Trademarks are the property of their respective owners. + */ + +#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/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; +} + +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(sizeof(*tp), GFP_KERNEL); + 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); + + return 0; +} + |