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