/* * Elantech Touchpad driver (v6) * * Copyright (C) 2007-2009 Arjan Opmeer * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * Trademarks are the property of their respective owners. */ #include #include #include #include #include #include #include #include #include "psmouse.h" #include "elantech.h" #define elantech_debug(fmt, ...) \ do { \ if (etd->debug) \ psmouse_printk(KERN_DEBUG, psmouse, \ fmt, ##__VA_ARGS__); \ } while (0) /* * Send a Synaptics style sliced query command */ static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param) { if (psmouse_sliced_command(psmouse, c) || ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c); return -1; } return 0; } /* * V3 and later support this fast command */ static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param) { struct ps2dev *ps2dev = &psmouse->ps2dev; if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) || ps2_command(ps2dev, NULL, c) || ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c); return -1; } return 0; } /* * A retrying version of ps2_command */ static int elantech_ps2_command(struct psmouse *psmouse, unsigned char *param, int command) { struct ps2dev *ps2dev = &psmouse->ps2dev; struct elantech_data *etd = psmouse->private; int rc; int tries = ETP_PS2_COMMAND_TRIES; do { rc = ps2_command(ps2dev, param, command); if (rc == 0) break; tries--; elantech_debug("retrying ps2 command 0x%02x (%d).\n", command, tries); msleep(ETP_PS2_COMMAND_DELAY); } while (tries > 0); if (rc) psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command); return rc; } /* * Send an Elantech style special command to read a value from a register */ static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg, unsigned char *val) { struct elantech_data *etd = psmouse->private; unsigned char param[3]; int rc = 0; if (reg < 0x07 || reg > 0x26) return -1; if (reg > 0x11 && reg < 0x20) return -1; switch (etd->hw_version) { case 1: if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) || psmouse_sliced_command(psmouse, reg) || ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { rc = -1; } break; case 2: if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, reg) || elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { rc = -1; } break; case 3 ... 4: if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, reg) || elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { rc = -1; } break; } if (rc) psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg); else if (etd->hw_version != 4) *val = param[0]; else *val = param[1]; return rc; } /* * Send an Elantech style special command to write a register with a value */ static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg, unsigned char val) { struct elantech_data *etd = psmouse->private; int rc = 0; if (reg < 0x07 || reg > 0x26) return -1; if (reg > 0x11 && reg < 0x20) return -1; switch (etd->hw_version) { case 1: if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) || psmouse_sliced_command(psmouse, reg) || psmouse_sliced_command(psmouse, val) || ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) { rc = -1; } break; case 2: if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, reg) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, val) || elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { rc = -1; } break; case 3: if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, reg) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, val) || elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { rc = -1; } break; case 4: if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, reg) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || elantech_ps2_command(psmouse, NULL, val) || elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { rc = -1; } break; } if (rc) psmouse_err(psmouse, "failed to write register 0x%02x with value 0x%02x.\n", reg, val); return rc; } /* * Dump a complete mouse movement packet to the syslog */ static void elantech_packet_dump(struct psmouse *psmouse) { int i; psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet ["); for (i = 0; i < psmouse->pktsize; i++) printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]); printk("]\n"); } /* * Interpret complete data packets and report absolute mode input events for * hardware version 1. (4 byte packets) */ static void elantech_report_absolute_v1(struct psmouse *psmouse) { struct input_dev *dev = psmouse->dev; struct elantech_data *etd = psmouse->private; unsigned char *packet = psmouse->packet; int fingers; if (etd->fw_version < 0x020000) { /* * byte 0: D U p1 p2 1 p3 R L * byte 1: f 0 th tw x9 x8 y9 y8 */ fingers = ((packet[1] & 0x80) >> 7) + ((packet[1] & 0x30) >> 4); } else { /* * byte 0: n1 n0 p2 p1 1 p3 R L * byte 1: 0 0 0 0 x9 x8 y9 y8 */ fingers = (packet[0] & 0xc0) >> 6; } if (etd->jumpy_cursor) { if (fingers != 1) { etd->single_finger_reports = 0; } else if (etd->single_finger_reports < 2) { /* Discard first 2 reports of one finger, bogus */ etd->single_finger_reports++; elantech_debug("discarding packet\n"); return; } } input_report_key(dev, BTN_TOUCH, fingers != 0); /* * byte 2: x7 x6 x5 x4 x3 x2 x1 x0 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0 */ if (fingers) { input_report_abs(dev, ABS_X, ((packet[1] & 0x0c) << 6) | packet[2]); input_report_abs(dev, ABS_Y, etd->y_max - (((packet[1] & 0x03) << 8) | packet[3])); } input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); input_report_key(dev, BTN_LEFT, packet[0] & 0x01); input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); if (etd->fw_version < 0x020000 && (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) { /* rocker up */ input_report_key(dev, BTN_FORWARD, packet[0] & 0x40); /* rocker down */ input_report_key(dev, BTN_BACK, packet[0] & 0x80); } input_sync(dev); } static void elantech_set_slot(struct input_dev *dev, int slot, bool active, unsigned int x, unsigned int y) { input_mt_slot(dev, slot); input_mt_report_slot_state(dev, MT_TOOL_FINGER, active); if (active) { input_report_abs(dev, ABS_MT_POSITION_X, x); input_report_abs(dev, ABS_MT_POSITION_Y, y); } } /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */ static void elantech_report_semi_mt_data(struct input_dev *dev, unsigned int num_fingers, unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2) { elantech_set_slot(dev, 0, num_fingers != 0, x1, y1); elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2); } /* * Interpret complete data packets and report absolute mode input events for * hardware version 2. (6 byte packets) */ static void elantech_report_absolute_v2(struct psmouse *psmouse) { struct elantech_data *etd = psmouse->private; struct input_dev *dev = psmouse->dev; unsigned char *packet = psmouse->packet; unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0; unsigned int width = 0, pres = 0; /* byte 0: n1 n0 . . . . R L */ fingers = (packet[0] & 0xc0) >> 6; switch (fingers) { case 3: /* * Same as one finger, except report of more than 3 fingers: * byte 3: n4 . w1 w0 . . . . */ if (packet[3] & 0x80) fingers = 4; /* pass through... */ case 1: /* * byte 1: . . . . x11 x10 x9 x8 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 */ x1 = ((packet[1] & 0x0f) << 8) | packet[2]; /* * byte 4: . . . . y11 y10 y9 y8 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 */ y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); break; case 2: /* * The coordinate of each finger is reported separately * with a lower resolution for two finger touches: * byte 0: . . ay8 ax8 . . . . * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 */ x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2; /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */ y1 = etd->y_max - ((((packet[0] & 0x20) << 3) | packet[2]) << 2); /* * byte 3: . . by8 bx8 . . . . * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 */ x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2; /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */ y2 = etd->y_max - ((((packet[3] & 0x20) << 3) | packet[5]) << 2); /* Unknown so just report sensible values */ pres = 127; width = 7; break; } input_report_key(dev, BTN_TOUCH, fingers != 0); if (fingers != 0) { input_report_abs(dev, ABS_X, x1); input_report_abs(dev, ABS_Y, y1); } elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4); input_report_key(dev, BTN_LEFT, packet[0] & 0x01); input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); if (etd->reports_pressure) { input_report_abs(dev, ABS_PRESSURE, pres); input_report_abs(dev, ABS_TOOL_WIDTH, width); } input_sync(dev); } /* * Interpret complete data packets and report absolute mode input events for * hardware version 3. (12 byte packets for two fingers) */ static void elantech_report_absolute_v3(struct psmouse *psmouse, int packet_type) { struct input_dev *dev = psmouse->dev; struct elantech_data *etd = psmouse->private; unsigned char *packet = psmouse->packet; unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0; unsigned int width = 0, pres = 0; /* byte 0: n1 n0 . . . . R L */ fingers = (packet[0] & 0xc0) >> 6; switch (fingers) { case 3: case 1: /* * byte 1: . . . . x11 x10 x9 x8 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 */ x1 = ((packet[1] & 0x0f) << 8) | packet[2]; /* * byte 4: . . . . y11 y10 y9 y8 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 */ y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); break; case 2: if (packet_type == PACKET_V3_HEAD) { /* * byte 1: . . . . ax11 ax10 ax9 ax8 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 */ etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2]; /* * byte 4: . . . . ay11 ay10 ay9 ay8 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */ etd->mt[0].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); /* * wait for next packet */ return; } /* packet_type == PACKET_V3_TAIL */ x1 = etd->mt[0].x; y1 = etd->mt[0].y; x2 = ((packet[1] & 0x0f) << 8) | packet[2]; y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); break; } pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); input_report_key(dev, BTN_TOUCH, fingers != 0); if (fingers != 0) { input_report_abs(dev, ABS_X, x1); input_report_abs(dev, ABS_Y, y1); } elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); /* For clickpads map both buttons to BTN_LEFT */ if (etd->fw_version & 0x001000) { input_report_key(dev, BTN_LEFT, packet[0] & 0x03); } else { input_report_key(dev, BTN_LEFT, packet[0] & 0x01); input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); } input_report_abs(dev, ABS_PRESSURE, pres); input_report_abs(dev, ABS_TOOL_WIDTH, width); input_sync(dev); } static void elantech_input_sync_v4(struct psmouse *psmouse) { struct input_dev *dev = psmouse->dev; struct elantech_data *etd = psmouse->private; unsigned char *packet = psmouse->packet; /* For clickpads map both buttons to BTN_LEFT */ if (etd->fw_version & 0x001000) { input_report_key(dev, BTN_LEFT, packet[0] & 0x03); } else { input_report_key(dev, BTN_LEFT, packet[0] & 0x01); input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); } input_mt_report_pointer_emulation(dev, true); input_sync(dev); } static void process_packet_status_v4(struct psmouse *psmouse) { struct input_dev *dev = psmouse->dev; unsigned char *packet = psmouse->packet; unsigned fingers; int i; /* notify finger state change */ fingers = packet[1] & 0x1f; for (i = 0; i < ETP_MAX_FINGERS; i++) { if ((fingers & (1 << i)) == 0) { input_mt_slot(dev, i); input_mt_report_slot_state(dev, MT_TOOL_FINGER, false); } } elantech_input_sync_v4(psmouse); } static void process_packet_head_v4(struct psmouse *psmouse) { struct input_dev *dev = psmouse->dev; struct elantech_data *etd = psmouse->private; unsigned char *packet = psmouse->packet; int id = ((packet[3] & 0xe0) >> 5) - 1; int pres, traces; if (id < 0) return; etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2]; etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); traces = (packet[0] & 0xf0) >> 4; input_mt_slot(dev, id); input_mt_report_slot_state(dev, MT_TOOL_FINGER, true); input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); input_report_abs(dev, ABS_MT_PRESSURE, pres); input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width); /* report this for backwards compatibility */ input_report_abs(dev, ABS_TOOL_WIDTH, traces); elantech_input_sync_v4(psmouse); } static void process_packet_motion_v4(struct psmouse *psmouse) { struct input_dev *dev = psmouse->dev; struct elantech_data *etd = psmouse->private; unsigned char *packet = psmouse->packet; int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0; int id, sid; id = ((packet[0] & 0xe0) >> 5) - 1; if (id < 0) return; sid = ((packet[3] & 0xe0) >> 5) - 1; weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1; /* * Motion packets give us the delta of x, y values of specific fingers, * but in two's complement. Let the compiler do the conversion for us. * Also _enlarge_ the numbers to int, in case of overflow. */ delta_x1 = (signed char)packet[1]; delta_y1 = (signed char)packet[2]; delta_x2 = (signed char)packet[4]; delta_y2 = (signed char)packet[5]; etd->mt[id].x += delta_x1 * weight; etd->mt[id].y -= delta_y1 * weight; input_mt_slot(dev, id); input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); if (sid >= 0) { etd->mt[sid].x += delta_x2 * weight; etd->mt[sid].y -= delta_y2 * weight; input_mt_slot(dev, sid); input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x); input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y); } elantech_input_sync_v4(psmouse); } static void elantech_report_absolute_v4(struct psmouse *psmouse, int packet_type) { switch (packet_type) { case PACKET_V4_STATUS: process_packet_status_v4(psmouse); break; case PACKET_V4_HEAD: process_packet_head_v4(psmouse); break; case PACKET_V4_MOTION: process_packet_motion_v4(psmouse); break; case PACKET_UNKNOWN: default: /* impossible to get here */ break; } } static int elantech_packet_check_v1(struct psmouse *psmouse) { struct elantech_data *etd = psmouse->private; unsigned char *packet = psmouse->packet; unsigned char p1, p2, p3; /* Parity bits are placed differently */ if (etd->fw_version < 0x020000) { /* byte 0: D U p1 p2 1 p3 R L */ p1 = (packet[0] & 0x20) >> 5; p2 = (packet[0] & 0x10) >> 4; } else { /* byte 0: n1 n0 p2 p1 1 p3 R L */ p1 = (packet[0] & 0x10) >> 4; p2 = (packet[0] & 0x20) >> 5; } p3 = (packet[0] & 0x04) >> 2; return etd->parity[packet[1]] == p1 && etd->parity[packet[2]] == p2 && etd->parity[packet[3]] == p3; } static int elantech_debounce_check_v2(struct psmouse *psmouse) { /* * When we encounter packet that matches this exactly, it means the * hardware is in debounce status. Just ignore the whole packet. */ const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff }; unsigned char *packet = psmouse->packet; return !memcmp(packet, debounce_packet, sizeof(debounce_packet)); } static int elantech_packet_check_v2(struct psmouse *psmouse) { struct elantech_data *etd = psmouse->private; unsigned char *packet = psmouse->packet; /* * V2 hardware has two flavors. Older ones that do not report pressure, * and newer ones that reports pressure and width. With newer ones, all * packets (1, 2, 3 finger touch) have the same constant bits. With * older ones, 1/3 finger touch packets and 2 finger touch packets * have different constant bits. * With all three cases, if the constant bits are not exactly what I * expected, I consider them invalid. */ if (etd->reports_pressure) return (packet[0] & 0x0c) == 0x04 && (packet[3] & 0x0f) == 0x02; if ((packet[0] & 0xc0) == 0x80) return (packet[0] & 0x0c) == 0x0c && (packet[3] & 0x0e) == 0x08; return (packet[0] & 0x3c) == 0x3c && (packet[1] & 0xf0) == 0x00 && (packet[3] & 0x3e) == 0x38 && (packet[4] & 0xf0) == 0x00; } /* * We check the constant bits to determine what packet type we get, * so packet checking is mandatory for v3 and later hardware. */ static int elantech_packet_check_v3(struct psmouse *psmouse) { const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff }; unsigned char *packet = psmouse->packet; /* * check debounce first, it has the same signature in byte 0 * and byte 3 as PACKET_V3_HEAD. */ if (!memcmp(packet, debounce_packet, sizeof(debounce_packet))) return PACKET_DEBOUNCE; if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02) return PACKET_V3_HEAD; if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c) return PACKET_V3_TAIL; return PACKET_UNKNOWN; } static int elantech_packet_check_v4(struct psmouse *psmouse) { unsigned char *packet = psmouse->packet; if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0x1f) == 0x11) return PACKET_V4_HEAD; if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0x1f) == 0x12) return PACKET_V4_MOTION; if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0x1f) == 0x10) return PACKET_V4_STATUS; return PACKET_UNKNOWN; } /* * Process byte stream from mouse and handle complete packets */ static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse) { struct elantech_data *etd = psmouse->private; int packet_type; if (psmouse->pktcnt < psmouse->pktsize) return PSMOUSE_GOOD_DATA; if (etd->debug > 1) elantech_packet_dump(psmouse); switch (etd->hw_version) { case 1: if (etd->paritycheck && !elantech_packet_check_v1(psmouse)) return PSMOUSE_BAD_DATA; elantech_report_absolute_v1(psmouse); break; case 2: /* ignore debounce */ if (elantech_debounce_check_v2(psmouse)) return PSMOUSE_FULL_PACKET; if (etd->paritycheck && !elantech_packet_check_v2(psmouse)) return PSMOUSE_BAD_DATA; elantech_report_absolute_v2(psmouse); break; case 3: packet_type = elantech_packet_check_v3(psmouse); /* ignore debounce */ if (packet_type == PACKET_DEBOUNCE) return PSMOUSE_FULL_PACKET; if (packet_type == PACKET_UNKNOWN) return PSMOUSE_BAD_DATA; elantech_report_absolute_v3(psmouse, packet_type); break; case 4: packet_type = elantech_packet_check_v4(psmouse); if (packet_type == PACKET_UNKNOWN) return PSMOUSE_BAD_DATA; elantech_report_absolute_v4(psmouse, packet_type); break; } return PSMOUSE_FULL_PACKET; } /* * This writes the reg_07 value again to the hardware at the end of every * set_rate call because the register loses its value. reg_07 allows setting * absolute mode on v4 hardware */ static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse, unsigned int rate) { struct elantech_data *etd = psmouse->private; etd->original_set_rate(psmouse, rate); if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) psmouse_err(psmouse, "restoring reg_07 failed\n"); } /* * Put the touchpad into absolute mode */ static int elantech_set_absolute_mode(struct psmouse *psmouse) { struct elantech_data *etd = psmouse->private; unsigned char val; int tries = ETP_READ_BACK_TRIES; int rc = 0; switch (etd->hw_version) { case 1: etd->reg_10 = 0x16; etd->reg_11 = 0x8f; if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || elantech_write_reg(psmouse, 0x11, etd->reg_11)) { rc = -1; } break; case 2: /* Windows driver values */ etd->reg_10 = 0x54; etd->reg_11 = 0x88; /* 0x8a */ etd->reg_21 = 0x60; /* 0x00 */ if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || elantech_write_reg(psmouse, 0x11, etd->reg_11) || elantech_write_reg(psmouse, 0x21, etd->reg_21)) { rc = -1; } break; case 3: if (etd->set_hw_resolution) etd->reg_10 = 0x0b; else etd->reg_10 = 0x01; if (elantech_write_reg(psmouse, 0x10, etd->reg_10)) rc = -1; break; case 4: etd->reg_07 = 0x01; if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) rc = -1; goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */ } if (rc == 0) { /* * Read back reg 0x10. For hardware version 1 we must make * sure the absolute mode bit is set. For hardware version 2 * the touchpad is probably initializing and not ready until * we read back the value we just wrote. */ do { rc = elantech_read_reg(psmouse, 0x10, &val); if (rc == 0) break; tries--; elantech_debug("retrying read (%d).\n", tries); msleep(ETP_READ_BACK_DELAY); } while (tries > 0); if (rc) { psmouse_err(psmouse, "failed to read back register 0x10.\n"); } else if (etd->hw_version == 1 && !(val & ETP_R10_ABSOLUTE_MODE)) { psmouse_err(psmouse, "touchpad refuses to switch to absolute mode.\n"); rc = -1; } } skip_readback_reg_10: if (rc) psmouse_err(psmouse, "failed to initialise registers.\n"); return rc; } static int elantech_set_range(struct psmouse *psmouse, unsigned int *x_min, unsigned int *y_min, unsigned int *x_max, unsigned int *y_max, unsigned int *width) { struct elantech_data *etd = psmouse->private; unsigned char param[3]; unsigned char traces; switch (etd->hw_version) { case 1: *x_min = ETP_XMIN_V1; *y_min = ETP_YMIN_V1; *x_max = ETP_XMAX_V1; *y_max = ETP_YMAX_V1; break; case 2: if (etd->fw_version == 0x020800 || etd->fw_version == 0x020b00 || etd->fw_version == 0x020030) { *x_min = ETP_XMIN_V2; *y_min = ETP_YMIN_V2; *x_max = ETP_XMAX_V2; *y_max = ETP_YMAX_V2; } else { int i; int fixed_dpi; i = (etd->fw_version > 0x020800 && etd->fw_version < 0x020900) ? 1 : 2; if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) return -1; fixed_dpi = param[1] & 0x10; if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) { if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param)) return -1; *x_max = (etd->capabilities[1] - i) * param[1] / 2; *y_max = (etd->capabilities[2] - i) * param[2] / 2; } else if (etd->fw_version == 0x040216) { *x_max = 819; *y_max = 405; } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) { *x_max = 900; *y_max = 500; } else { *x_max = (etd->capabilities[1] - i) * 64; *y_max = (etd->capabilities[2] - i) * 64; } } break; case 3: if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) return -1; *x_max = (0x0f & param[0]) << 8 | param[1]; *y_max = (0xf0 & param[0]) << 4 | param[2]; break; case 4: if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) return -1; *x_max = (0x0f & param[0]) << 8 | param[1]; *y_max = (0xf0 & param[0]) << 4 | param[2]; traces = etd->capabilities[1]; if ((traces < 2) || (traces > *x_max)) return -1; *width = *x_max / (traces - 1); break; } return 0; } /* * (value from firmware) * 10 + 790 = dpi * we also have to convert dpi to dots/mm (*10/254 to avoid floating point) */ static unsigned int elantech_convert_res(unsigned int val) { return (val * 10 + 790) * 10 / 254; } static int elantech_get_resolution_v4(struct psmouse *psmouse, unsigned int *x_res, unsigned int *y_res) { unsigned char param[3]; if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param)) return -1; *x_res = elantech_convert_res(param[1] & 0x0f); *y_res = elantech_convert_res((param[1] & 0xf0) >> 4); return 0; } /* * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in * fw_version for this is based on the following fw_version & caps table: * * Laptop-model: fw_version: caps: buttons: * Acer S3 0x461f00 10, 13, 0e clickpad * Acer S7-392 0x581f01 50, 17, 0d clickpad * Acer V5-131 0x461f02 01, 16, 0c clickpad * Acer V5-551 0x461f00 ? clickpad * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons * Asus TP500LN 0x381f17 10, 14, 0e clickpad * Asus X750JN 0x381f17 10, 14, 0e clickpad * Asus UX31 0x361f00 20, 15, 0e clickpad * Asus UX32VD 0x361f02 00, 15, 0e clickpad * Avatar AVIU-145A2 0x361f00 ? clickpad * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*) * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad * Samsung NP900X3E-A02 0x575f03 ? clickpad * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons * Samsung RF710 0x450f00 ? 2 hw buttons * System76 Pangolin 0x250f01 ? 2 hw buttons * (*) + 3 trackpoint buttons */ static void elantech_set_buttonpad_prop(struct psmouse *psmouse) { struct input_dev *dev = psmouse->dev; struct elantech_data *etd = psmouse->private; if (etd->fw_version & 0x001000) { __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); __clear_bit(BTN_RIGHT, dev->keybit); } } /* * Set the appropriate event bits for the input subsystem */ static int elantech_set_input_params(struct psmouse *psmouse) { struct input_dev *dev = psmouse->dev; struct elantech_data *etd = psmouse->private; unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0; unsigned int x_res = 0, y_res = 0; if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width)) return -1; __set_bit(INPUT_PROP_POINTER, dev->propbit); __set_bit(EV_KEY, dev->evbit); __set_bit(EV_ABS, dev->evbit); __clear_bit(EV_REL, dev->evbit); __set_bit(BTN_LEFT, dev->keybit); __set_bit(BTN_RIGHT, dev->keybit); __set_bit(BTN_TOUCH, dev->keybit); __set_bit(BTN_TOOL_FINGER, dev->keybit); __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit); __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit); switch (etd->hw_version) { case 1: /* Rocker button */ if (etd->fw_version < 0x020000 && (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) { __set_bit(BTN_FORWARD, dev->keybit); __set_bit(BTN_BACK, dev->keybit); } input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); break; case 2: __set_bit(BTN_TOOL_QUADTAP, dev->keybit); __set_bit(INPUT_PROP_SEMI_MT, dev->propbit); /* fall through */ case 3: if (etd->hw_version == 3) elantech_set_buttonpad_prop(psmouse); input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); if (etd->reports_pressure) { input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, ETP_PMAX_V2, 0, 0); input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, ETP_WMAX_V2, 0, 0); } input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT); input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); break; case 4: if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) { /* * if query failed, print a warning and leave the values * zero to resemble synaptics.c behavior. */ psmouse_warn(psmouse, "couldn't query resolution data.\n"); } elantech_set_buttonpad_prop(psmouse); __set_bit(BTN_TOOL_QUADTAP, dev->keybit); /* For X to recognize me as touchpad. */ input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); input_abs_set_res(dev, ABS_X, x_res); input_abs_set_res(dev, ABS_Y, y_res); /* * range of pressure and width is the same as v2, * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility. */ input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, ETP_PMAX_V2, 0, 0); input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, ETP_WMAX_V2, 0, 0); /* Multitouch capable pad, up to 5 fingers. */ input_mt_init_slots(dev, ETP_MAX_FINGERS, 0); input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); input_abs_set_res(dev, ABS_MT_POSITION_X, x_res); input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res); input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2, ETP_PMAX_V2, 0, 0); /* * The firmware reports how many trace lines the finger spans, * convert to surface unit as Protocol-B requires. */ input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0, ETP_WMAX_V2 * width, 0, 0); break; } etd->y_max = y_max; etd->width = width; return 0; } struct elantech_attr_data { size_t field_offset; unsigned char reg; }; /* * Display a register value by reading a sysfs entry */ static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, char *buf) { struct elantech_data *etd = psmouse->private; struct elantech_attr_data *attr = data; unsigned char *reg = (unsigned char *) etd + attr->field_offset; int rc = 0; if (attr->reg) rc = elantech_read_reg(psmouse, attr->reg, reg); return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); } /* * Write a register value by writing a sysfs entry */ static ssize_t elantech_set_int_attr(struct psmouse *psmouse, void *data, const char *buf, size_t count) { struct elantech_data *etd = psmouse->private; struct elantech_attr_data *attr = data; unsigned char *reg = (unsigned char *) etd + attr->field_offset; unsigned char value; int err; err = kstrtou8(buf, 16, &value); if (err) return err; /* Do we need to preserve some bits for version 2 hardware too? */ if (etd->hw_version == 1) { if (attr->reg == 0x10) /* Force absolute mode always on */ value |= ETP_R10_ABSOLUTE_MODE; else if (attr->reg == 0x11) /* Force 4 byte mode always on */ value |= ETP_R11_4_BYTE_MODE; } if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) *reg = value; return count; } #define ELANTECH_INT_ATTR(_name, _register) \ static struct elantech_attr_data elantech_attr_##_name = { \ .field_offset = offsetof(struct elantech_data, _name), \ .reg = _register, \ }; \ PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ &elantech_attr_##_name, \ elantech_show_int_attr, \ elantech_set_int_attr) ELANTECH_INT_ATTR(reg_07, 0x07); ELANTECH_INT_ATTR(reg_10, 0x10); ELANTECH_INT_ATTR(reg_11, 0x11); ELANTECH_INT_ATTR(reg_20, 0x20); ELANTECH_INT_ATTR(reg_21, 0x21); ELANTECH_INT_ATTR(reg_22, 0x22); ELANTECH_INT_ATTR(reg_23, 0x23); ELANTECH_INT_ATTR(reg_24, 0x24); ELANTECH_INT_ATTR(reg_25, 0x25); ELANTECH_INT_ATTR(reg_26, 0x26); ELANTECH_INT_ATTR(debug, 0); ELANTECH_INT_ATTR(paritycheck, 0); static struct attribute *elantech_attrs[] = { &psmouse_attr_reg_07.dattr.attr, &psmouse_attr_reg_10.dattr.attr, &psmouse_attr_reg_11.dattr.attr, &psmouse_attr_reg_20.dattr.attr, &psmouse_attr_reg_21.dattr.attr, &psmouse_attr_reg_22.dattr.attr, &psmouse_attr_reg_23.dattr.attr, &psmouse_attr_reg_24.dattr.attr, &psmouse_attr_reg_25.dattr.attr, &psmouse_attr_reg_26.dattr.attr, &psmouse_attr_debug.dattr.attr, &psmouse_attr_paritycheck.dattr.attr, NULL }; static struct attribute_group elantech_attr_group = { .attrs = elantech_attrs, }; static bool elantech_is_signature_valid(const unsigned char *param) { static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 }; int i; if (param[0] == 0) return false; if (param[1] == 0) return true; /* * Some hw_version >= 4 models have a revision higher then 20. Meaning * that param[2] may be 10 or 20, skip the rates check for these. */ if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f && param[2] < 40) return true; for (i = 0; i < ARRAY_SIZE(rates); i++) if (param[2] == rates[i]) return false; return true; } /* * Use magic knock to detect Elantech touchpad */ int elantech_detect(struct psmouse *psmouse, bool set_properties) { struct ps2dev *ps2dev = &psmouse->ps2dev; unsigned char param[3]; ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n"); return -1; } /* * Report this in case there are Elantech models that use a different * set of magic numbers */ if (param[0] != 0x3c || param[1] != 0x03 || (param[2] != 0xc8 && param[2] != 0x00)) { psmouse_dbg(psmouse, "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", param[0], param[1], param[2]); return -1; } /* * Query touchpad's firmware version and see if it reports known * value to avoid mis-detection. Logitech mice are known to respond * to Elantech magic knock and there might be more. */ if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { psmouse_dbg(psmouse, "failed to query firmware version.\n"); return -1; } psmouse_dbg(psmouse, "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", param[0], param[1], param[2]); if (!elantech_is_signature_valid(param)) { psmouse_dbg(psmouse, "Probably not a real Elantech touchpad. Aborting.\n"); return -1; } if (set_properties) { psmouse->vendor = "Elantech"; psmouse->name = "Touchpad"; } return 0; } /* * Clean up sysfs entries when disconnecting */ static void elantech_disconnect(struct psmouse *psmouse) { sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, &elantech_attr_group); kfree(psmouse->private); psmouse->private = NULL; } /* * Put the touchpad back into absolute mode when reconnecting */ static int elantech_reconnect(struct psmouse *psmouse) { psmouse_reset(psmouse); if (elantech_detect(psmouse, 0)) return -1; if (elantech_set_absolute_mode(psmouse)) { psmouse_err(psmouse, "failed to put touchpad back into absolute mode.\n"); return -1; } return 0; } /* * Some hw_version 3 models go into error state when we try to set * bit 3 and/or bit 1 of r10. */ static const struct dmi_system_id no_hw_res_dmi_table[] = { #if defined(CONFIG_DMI) && defined(CONFIG_X86) { /* Gigabyte U2442 */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), DMI_MATCH(DMI_PRODUCT_NAME, "U2442"), }, }, { /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */ .matches = { DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"), }, }, #endif { } }; /* * determine hardware version and set some properties according to it. */ static int elantech_set_properties(struct elantech_data *etd) { /* This represents the version of IC body. */ int ver = (etd->fw_version & 0x0f0000) >> 16; /* Early version of Elan touchpads doesn't obey the rule. */ if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600) etd->hw_version = 1; else { switch (ver) { case 2: case 4: etd->hw_version = 2; break; case 5: etd->hw_version = 3; break; case 6: etd->hw_version = 4; break; default: return -1; } } /* decide which send_cmd we're gonna use early */ etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd : synaptics_send_cmd; /* Turn on packet checking by default */ etd->paritycheck = 1; /* * This firmware suffers from misreporting coordinates when * a touch action starts causing the mouse cursor or scrolled page * to jump. Enable a workaround. */ etd->jumpy_cursor = (etd->fw_version == 0x020022 || etd->fw_version == 0x020600); if (etd->hw_version > 1) { /* For now show extra debug information */ etd->debug = 1; if (etd->fw_version >= 0x020800) etd->reports_pressure = true; } /* Enable real hardware resolution on hw_version 3 ? */ etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table); return 0; } /* * Initialize the touchpad and create sysfs entries */ int elantech_init(struct psmouse *psmouse) { struct elantech_data *etd; int i, error; unsigned char param[3]; psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL); if (!etd) return -ENOMEM; psmouse_reset(psmouse); etd->parity[0] = 1; for (i = 1; i < 256; i++) etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; /* * Do the version query again so we can store the result */ if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { psmouse_err(psmouse, "failed to query firmware version.\n"); goto init_fail; } etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; if (elantech_set_properties(etd)) { psmouse_err(psmouse, "unknown hardware version, aborting...\n"); goto init_fail; } psmouse_info(psmouse, "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n", etd->hw_version, param[0], param[1], param[2]); if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY, etd->capabilities)) { psmouse_err(psmouse, "failed to query capabilities.\n"); goto init_fail; } psmouse_info(psmouse, "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", etd->capabilities[0], etd->capabilities[1], etd->capabilities[2]); if (elantech_set_absolute_mode(psmouse)) { psmouse_err(psmouse, "failed to put touchpad into absolute mode.\n"); goto init_fail; } if (etd->fw_version == 0x381f17) { etd->original_set_rate = psmouse->set_rate; psmouse->set_rate = elantech_set_rate_restore_reg_07; } if (elantech_set_input_params(psmouse)) { psmouse_err(psmouse, "failed to query touchpad range.\n"); goto init_fail; } error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, &elantech_attr_group); if (error) { psmouse_err(psmouse, "failed to create sysfs attributes, error: %d.\n", error); goto init_fail; } psmouse->protocol_handler = elantech_process_byte; psmouse->disconnect = elantech_disconnect; psmouse->reconnect = elantech_reconnect; psmouse->pktsize = etd->hw_version > 1 ? 6 : 4; return 0; init_fail: kfree(etd); return -1; }