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1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 | /* * Elantech Touchpad driver (v6) * * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net> * * 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 <linux/delay.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/input.h> #include <linux/input/mt.h> #include <linux/serio.h> #include <linux/libps2.h> #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); 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; unsigned char *packet = psmouse->packet; input_report_key(dev, BTN_LEFT, packet[0] & 0x01); 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; } /* * 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: etd->reg_10 = 0x0b; 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; } /* * 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: 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_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"); } /* v4 is clickpad, with only one button. */ __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); __clear_bit(BTN_RIGHT, dev->keybit); __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); 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; 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; } /* * 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; } 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 (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; } |