drivers/input/touchscreen/atmel_mxt_ts.c

   1 /*
   2  * Atmel maXTouch Touchscreen driver
   3  *
   4  * Copyright (C) 2010 Samsung Electronics Co.Ltd
   5  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <linux/firmware.h>
  18 #include <linux/i2c.h>
  19 #include <linux/i2c/atmel_mxt_ts.h>
  20 #include <linux/input.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/slab.h>
  23
  24 /* Version */
  25 #define MXT_VER_20              20
  26 #define MXT_VER_21              21
  27 #define MXT_VER_22              22
  28
  29 /* Slave addresses */
  30 #define MXT_APP_LOW             0x4a
  31 #define MXT_APP_HIGH            0x4b
  32 #define MXT_BOOT_LOW            0x24
  33 #define MXT_BOOT_HIGH           0x25
  34
  35 /* Firmware */
  36 #define MXT_FW_NAME             "maxtouch.fw"
  37
  38 /* Registers */
  39 #define MXT_FAMILY_ID           0x00
  40 #define MXT_VARIANT_ID          0x01
  41 #define MXT_VERSION             0x02
  42 #define MXT_BUILD               0x03
  43 #define MXT_MATRIX_X_SIZE       0x04
  44 #define MXT_MATRIX_Y_SIZE       0x05
  45 #define MXT_OBJECT_NUM          0x06
  46 #define MXT_OBJECT_START        0x07
  47
  48 #define MXT_OBJECT_SIZE         6
  49
  50 /* Object types */
  51 #define MXT_DEBUG_DIAGNOSTIC    37
  52 #define MXT_GEN_MESSAGE         5
  53 #define MXT_GEN_COMMAND         6
  54 #define MXT_GEN_POWER           7
  55 #define MXT_GEN_ACQUIRE         8
  56 #define MXT_TOUCH_MULTI         9
  57 #define MXT_TOUCH_KEYARRAY      15
  58 #define MXT_TOUCH_PROXIMITY     23
  59 #define MXT_PROCI_GRIPFACE      20
  60 #define MXT_PROCG_NOISE         22
  61 #define MXT_PROCI_ONETOUCH      24
  62 #define MXT_PROCI_TWOTOUCH      27
  63 #define MXT_PROCI_GRIP          40
  64 #define MXT_PROCI_PALM          41
  65 #define MXT_SPT_COMMSCONFIG     18
  66 #define MXT_SPT_GPIOPWM         19
  67 #define MXT_SPT_SELFTEST        25
  68 #define MXT_SPT_CTECONFIG       28
  69 #define MXT_SPT_USERDATA        38
  70 #define MXT_SPT_DIGITIZER       43
  71 #define MXT_SPT_MESSAGECOUNT    44
  72
  73 /* MXT_GEN_COMMAND field */
  74 #define MXT_COMMAND_RESET       0
  75 #define MXT_COMMAND_BACKUPNV    1
  76 #define MXT_COMMAND_CALIBRATE   2
  77 #define MXT_COMMAND_REPORTALL   3
  78 #define MXT_COMMAND_DIAGNOSTIC  5
  79
  80 /* MXT_GEN_POWER field */
  81 #define MXT_POWER_IDLEACQINT    0
  82 #define MXT_POWER_ACTVACQINT    1
  83 #define MXT_POWER_ACTV2IDLETO   2
  84
  85 /* MXT_GEN_ACQUIRE field */
  86 #define MXT_ACQUIRE_CHRGTIME    0
  87 #define MXT_ACQUIRE_TCHDRIFT    2
  88 #define MXT_ACQUIRE_DRIFTST     3
  89 #define MXT_ACQUIRE_TCHAUTOCAL  4
  90 #define MXT_ACQUIRE_SYNC        5
  91 #define MXT_ACQUIRE_ATCHCALST   6
  92 #define MXT_ACQUIRE_ATCHCALSTHR 7
  93
  94 /* MXT_TOUCH_MULTI field */
  95 #define MXT_TOUCH_CTRL          0
  96 #define MXT_TOUCH_XORIGIN       1
  97 #define MXT_TOUCH_YORIGIN       2
  98 #define MXT_TOUCH_XSIZE         3
  99 #define MXT_TOUCH_YSIZE         4
 100 #define MXT_TOUCH_BLEN          6
 101 #define MXT_TOUCH_TCHTHR        7
 102 #define MXT_TOUCH_TCHDI         8
 103 #define MXT_TOUCH_ORIENT        9
 104 #define MXT_TOUCH_MOVHYSTI      11
 105 #define MXT_TOUCH_MOVHYSTN      12
 106 #define MXT_TOUCH_NUMTOUCH      14
 107 #define MXT_TOUCH_MRGHYST       15
 108 #define MXT_TOUCH_MRGTHR        16
 109 #define MXT_TOUCH_AMPHYST       17
 110 #define MXT_TOUCH_XRANGE_LSB    18
 111 #define MXT_TOUCH_XRANGE_MSB    19
 112 #define MXT_TOUCH_YRANGE_LSB    20
 113 #define MXT_TOUCH_YRANGE_MSB    21
 114 #define MXT_TOUCH_XLOCLIP       22
 115 #define MXT_TOUCH_XHICLIP       23
 116 #define MXT_TOUCH_YLOCLIP       24
 117 #define MXT_TOUCH_YHICLIP       25
 118 #define MXT_TOUCH_XEDGECTRL     26
 119 #define MXT_TOUCH_XEDGEDIST     27
 120 #define MXT_TOUCH_YEDGECTRL     28
 121 #define MXT_TOUCH_YEDGEDIST     29
 122 #define MXT_TOUCH_JUMPLIMIT     30
 123
 124 /* MXT_PROCI_GRIPFACE field */
 125 #define MXT_GRIPFACE_CTRL       0
 126 #define MXT_GRIPFACE_XLOGRIP    1
 127 #define MXT_GRIPFACE_XHIGRIP    2
 128 #define MXT_GRIPFACE_YLOGRIP    3
 129 #define MXT_GRIPFACE_YHIGRIP    4
 130 #define MXT_GRIPFACE_MAXTCHS    5
 131 #define MXT_GRIPFACE_SZTHR1     7
 132 #define MXT_GRIPFACE_SZTHR2     8
 133 #define MXT_GRIPFACE_SHPTHR1    9
 134 #define MXT_GRIPFACE_SHPTHR2    10
 135 #define MXT_GRIPFACE_SUPEXTTO   11
 136
 137 /* MXT_PROCI_NOISE field */
 138 #define MXT_NOISE_CTRL          0
 139 #define MXT_NOISE_OUTFLEN       1
 140 #define MXT_NOISE_GCAFUL_LSB    3
 141 #define MXT_NOISE_GCAFUL_MSB    4
 142 #define MXT_NOISE_GCAFLL_LSB    5
 143 #define MXT_NOISE_GCAFLL_MSB    6
 144 #define MXT_NOISE_ACTVGCAFVALID 7
 145 #define MXT_NOISE_NOISETHR      8
 146 #define MXT_NOISE_FREQHOPSCALE  10
 147 #define MXT_NOISE_FREQ0         11
 148 #define MXT_NOISE_FREQ1         12
 149 #define MXT_NOISE_FREQ2         13
 150 #define MXT_NOISE_FREQ3         14
 151 #define MXT_NOISE_FREQ4         15
 152 #define MXT_NOISE_IDLEGCAFVALID 16
 153
 154 /* MXT_SPT_COMMSCONFIG */
 155 #define MXT_COMMS_CTRL          0
 156 #define MXT_COMMS_CMD           1
 157
 158 /* MXT_SPT_CTECONFIG field */
 159 #define MXT_CTE_CTRL            0
 160 #define MXT_CTE_CMD             1
 161 #define MXT_CTE_MODE            2
 162 #define MXT_CTE_IDLEGCAFDEPTH   3
 163 #define MXT_CTE_ACTVGCAFDEPTH   4
 164 #define MXT_CTE_VOLTAGE         5
 165
 166 #define MXT_VOLTAGE_DEFAULT     2700000
 167 #define MXT_VOLTAGE_STEP        10000
 168
 169 /* Define for MXT_GEN_COMMAND */
 170 #define MXT_BOOT_VALUE          0xa5
 171 #define MXT_BACKUP_VALUE        0x55
 172 #define MXT_BACKUP_TIME         25      /* msec */
 173 #define MXT_RESET_TIME          65      /* msec */
 174
 175 #define MXT_FWRESET_TIME        175     /* msec */
 176
 177 /* Command to unlock bootloader */
 178 #define MXT_UNLOCK_CMD_MSB      0xaa
 179 #define MXT_UNLOCK_CMD_LSB      0xdc
 180
 181 /* Bootloader mode status */
 182 #define MXT_WAITING_BOOTLOAD_CMD        0xc0    /* valid 7 6 bit only */
 183 #define MXT_WAITING_FRAME_DATA  0x80    /* valid 7 6 bit only */
 184 #define MXT_FRAME_CRC_CHECK     0x02
 185 #define MXT_FRAME_CRC_FAIL      0x03
 186 #define MXT_FRAME_CRC_PASS      0x04
 187 #define MXT_APP_CRC_FAIL        0x40    /* valid 7 8 bit only */
 188 #define MXT_BOOT_STATUS_MASK    0x3f
 189
 190 /* Touch status */
 191 #define MXT_SUPPRESS            (1 << 1)
 192 #define MXT_AMP                 (1 << 2)
 193 #define MXT_VECTOR              (1 << 3)
 194 #define MXT_MOVE                (1 << 4)
 195 #define MXT_RELEASE             (1 << 5)
 196 #define MXT_PRESS               (1 << 6)
 197 #define MXT_DETECT              (1 << 7)
 198
 199 /* Touchscreen absolute values */
 200 #define MXT_MAX_XC              0x3ff
 201 #define MXT_MAX_YC              0x3ff
 202 #define MXT_MAX_AREA            0xff
 203
 204 #define MXT_MAX_FINGER          10
 205
 206 struct mxt_info {
 207         u8 family_id;
 208         u8 variant_id;
 209         u8 version;
 210         u8 build;
 211         u8 matrix_xsize;
 212         u8 matrix_ysize;
 213         u8 object_num;
 214 };
 215
 216 struct mxt_object {
 217         u8 type;
 218         u16 start_address;
 219         u8 size;
 220         u8 instances;
 221         u8 num_report_ids;
 222
 223         /* to map object and message */
 224         u8 max_reportid;
 225 };
 226
 227 struct mxt_message {
 228         u8 reportid;
 229         u8 message[7];
 230         u8 checksum;
 231 };
 232
 233 struct mxt_finger {
 234         int status;
 235         int x;
 236         int y;
 237         int area;
 238 };
 239
 240 /* Each client has this additional data */
 241 struct mxt_data {
 242         struct i2c_client *client;
 243         struct input_dev *input_dev;
 244         const struct mxt_platform_data *pdata;
 245         struct mxt_object *object_table;
 246         struct mxt_info info;
 247         struct mxt_finger finger[MXT_MAX_FINGER];
 248         unsigned int irq;
 249 };
 250
 251 static bool mxt_object_readable(unsigned int type)
 252 {
 253         switch (type) {
 254         case MXT_GEN_MESSAGE:
 255         case MXT_GEN_COMMAND:
 256         case MXT_GEN_POWER:
 257         case MXT_GEN_ACQUIRE:
 258         case MXT_TOUCH_MULTI:
 259         case MXT_TOUCH_KEYARRAY:
 260         case MXT_TOUCH_PROXIMITY:
 261         case MXT_PROCI_GRIPFACE:
 262         case MXT_PROCG_NOISE:
 263         case MXT_PROCI_ONETOUCH:
 264         case MXT_PROCI_TWOTOUCH:
 265         case MXT_PROCI_GRIP:
 266         case MXT_PROCI_PALM:
 267         case MXT_SPT_COMMSCONFIG:
 268         case MXT_SPT_GPIOPWM:
 269         case MXT_SPT_SELFTEST:
 270         case MXT_SPT_CTECONFIG:
 271         case MXT_SPT_USERDATA:
 272                 return true;
 273         default:
 274                 return false;
 275         }
 276 }
 277
 278 static bool mxt_object_writable(unsigned int type)
 279 {
 280         switch (type) {
 281         case MXT_GEN_COMMAND:
 282         case MXT_GEN_POWER:
 283         case MXT_GEN_ACQUIRE:
 284         case MXT_TOUCH_MULTI:
 285         case MXT_TOUCH_KEYARRAY:
 286         case MXT_TOUCH_PROXIMITY:
 287         case MXT_PROCI_GRIPFACE:
 288         case MXT_PROCG_NOISE:
 289         case MXT_PROCI_ONETOUCH:
 290         case MXT_PROCI_TWOTOUCH:
 291         case MXT_PROCI_GRIP:
 292         case MXT_PROCI_PALM:
 293         case MXT_SPT_GPIOPWM:
 294         case MXT_SPT_SELFTEST:
 295         case MXT_SPT_CTECONFIG:
 296                 return true;
 297         default:
 298                 return false;
 299         }
 300 }
 301
 302 static void mxt_dump_message(struct device *dev,
 303                                   struct mxt_message *message)
 304 {
 305         dev_dbg(dev, "reportid:\t0x%x\n", message->reportid);
 306         dev_dbg(dev, "message1:\t0x%x\n", message->message[0]);
 307         dev_dbg(dev, "message2:\t0x%x\n", message->message[1]);
 308         dev_dbg(dev, "message3:\t0x%x\n", message->message[2]);
 309         dev_dbg(dev, "message4:\t0x%x\n", message->message[3]);
 310         dev_dbg(dev, "message5:\t0x%x\n", message->message[4]);
 311         dev_dbg(dev, "message6:\t0x%x\n", message->message[5]);
 312         dev_dbg(dev, "message7:\t0x%x\n", message->message[6]);
 313         dev_dbg(dev, "checksum:\t0x%x\n", message->checksum);
 314 }
 315
 316 static int mxt_check_bootloader(struct i2c_client *client,
 317                                      unsigned int state)
 318 {
 319         u8 val;
 320
 321 recheck:
 322         if (i2c_master_recv(client, &val, 1) != 1) {
 323                 dev_err(&client->dev, "%s: i2c recv failed\n", __func__);
 324                 return -EIO;
 325         }
 326
 327         switch (state) {
 328         case MXT_WAITING_BOOTLOAD_CMD:
 329         case MXT_WAITING_FRAME_DATA:
 330                 val &= ~MXT_BOOT_STATUS_MASK;
 331                 break;
 332         case MXT_FRAME_CRC_PASS:
 333                 if (val == MXT_FRAME_CRC_CHECK)
 334                         goto recheck;
 335                 break;
 336         default:
 337                 return -EINVAL;
 338         }
 339
 340         if (val != state) {
 341                 dev_err(&client->dev, "Unvalid bootloader mode state\n");
 342                 return -EINVAL;
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int mxt_unlock_bootloader(struct i2c_client *client)
 349 {
 350         u8 buf[2];
 351
 352         buf[0] = MXT_UNLOCK_CMD_LSB;
 353         buf[1] = MXT_UNLOCK_CMD_MSB;
 354
 355         if (i2c_master_send(client, buf, 2) != 2) {
 356                 dev_err(&client->dev, "%s: i2c send failed\n", __func__);
 357                 return -EIO;
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int mxt_fw_write(struct i2c_client *client,
 364                              const u8 *data, unsigned int frame_size)
 365 {
 366         if (i2c_master_send(client, data, frame_size) != frame_size) {
 367                 dev_err(&client->dev, "%s: i2c send failed\n", __func__);
 368                 return -EIO;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static int __mxt_read_reg(struct i2c_client *client,
 375                                u16 reg, u16 len, void *val)
 376 {
 377         struct i2c_msg xfer[2];
 378         u8 buf[2];
 379
 380         buf[0] = reg & 0xff;
 381         buf[1] = (reg >> 8) & 0xff;
 382
 383         /* Write register */
 384         xfer[0].addr = client->addr;
 385         xfer[0].flags = 0;
 386         xfer[0].len = 2;
 387         xfer[0].buf = buf;
 388
 389         /* Read data */
 390         xfer[1].addr = client->addr;
 391         xfer[1].flags = I2C_M_RD;
 392         xfer[1].len = len;
 393         xfer[1].buf = val;
 394
 395         if (i2c_transfer(client->adapter, xfer, 2) != 2) {
 396                 dev_err(&client->dev, "%s: i2c transfer failed\n", __func__);
 397                 return -EIO;
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int mxt_read_reg(struct i2c_client *client, u16 reg, u8 *val)
 404 {
 405         return __mxt_read_reg(client, reg, 1, val);
 406 }
 407
 408 static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
 409 {
 410         u8 buf[3];
 411
 412         buf[0] = reg & 0xff;
 413         buf[1] = (reg >> 8) & 0xff;
 414         buf[2] = val;
 415
 416         if (i2c_master_send(client, buf, 3) != 3) {
 417                 dev_err(&client->dev, "%s: i2c send failed\n", __func__);
 418                 return -EIO;
 419         }
 420
 421         return 0;
 422 }
 423
 424 static int mxt_read_object_table(struct i2c_client *client,
 425                                       u16 reg, u8 *object_buf)
 426 {
 427         return __mxt_read_reg(client, reg, MXT_OBJECT_SIZE,
 428                                    object_buf);
 429 }
 430
 431 static struct mxt_object *
 432 mxt_get_object(struct mxt_data *data, u8 type)
 433 {
 434         struct mxt_object *object;
 435         int i;
 436
 437         for (i = 0; i < data->info.object_num; i++) {
 438                 object = data->object_table + i;
 439                 if (object->type == type)
 440                         return object;
 441         }
 442
 443         dev_err(&data->client->dev, "Invalid object type\n");
 444         return NULL;
 445 }
 446
 447 static int mxt_read_message(struct mxt_data *data,
 448                                  struct mxt_message *message)
 449 {
 450         struct mxt_object *object;
 451         u16 reg;
 452
 453         object = mxt_get_object(data, MXT_GEN_MESSAGE);
 454         if (!object)
 455                 return -EINVAL;
 456
 457         reg = object->start_address;
 458         return __mxt_read_reg(data->client, reg,
 459                         sizeof(struct mxt_message), message);
 460 }
 461
 462 static int mxt_read_object(struct mxt_data *data,
 463                                 u8 type, u8 offset, u8 *val)
 464 {
 465         struct mxt_object *object;
 466         u16 reg;
 467
 468         object = mxt_get_object(data, type);
 469         if (!object)
 470                 return -EINVAL;
 471
 472         reg = object->start_address;
 473         return __mxt_read_reg(data->client, reg + offset, 1, val);
 474 }
 475
 476 static int mxt_write_object(struct mxt_data *data,
 477                                  u8 type, u8 offset, u8 val)
 478 {
 479         struct mxt_object *object;
 480         u16 reg;
 481
 482         object = mxt_get_object(data, type);
 483         if (!object)
 484                 return -EINVAL;
 485
 486         reg = object->start_address;
 487         return mxt_write_reg(data->client, reg + offset, val);
 488 }
 489
 490 static void mxt_input_report(struct mxt_data *data, int single_id)
 491 {
 492         struct mxt_finger *finger = data->finger;
 493         struct input_dev *input_dev = data->input_dev;
 494         int status = finger[single_id].status;
 495         int finger_num = 0;
 496         int id;
 497
 498         for (id = 0; id < MXT_MAX_FINGER; id++) {
 499                 if (!finger[id].status)
 500                         continue;
 501
 502                 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
 503                                 finger[id].status != MXT_RELEASE ?
 504                                 finger[id].area : 0);
 505                 input_report_abs(input_dev, ABS_MT_POSITION_X,
 506                                 finger[id].x);
 507                 input_report_abs(input_dev, ABS_MT_POSITION_Y,
 508                                 finger[id].y);
 509                 input_mt_sync(input_dev);
 510
 511                 if (finger[id].status == MXT_RELEASE)
 512                         finger[id].status = 0;
 513                 else
 514                         finger_num++;
 515         }
 516
 517         input_report_key(input_dev, BTN_TOUCH, finger_num > 0);
 518
 519         if (status != MXT_RELEASE) {
 520                 input_report_abs(input_dev, ABS_X, finger[single_id].x);
 521                 input_report_abs(input_dev, ABS_Y, finger[single_id].y);
 522         }
 523
 524         input_sync(input_dev);
 525 }
 526
 527 static void mxt_input_touchevent(struct mxt_data *data,
 528                                       struct mxt_message *message, int id)
 529 {
 530         struct mxt_finger *finger = data->finger;
 531         struct device *dev = &data->client->dev;
 532         u8 status = message->message[0];
 533         int x;
 534         int y;
 535         int area;
 536
 537         /* Check the touch is present on the screen */
 538         if (!(status & MXT_DETECT)) {
 539                 if (status & MXT_RELEASE) {
 540                         dev_dbg(dev, "[%d] released\n", id);
 541
 542                         finger[id].status = MXT_RELEASE;
 543                         mxt_input_report(data, id);
 544                 }
 545                 return;
 546         }
 547
 548         /* Check only AMP detection */
 549         if (!(status & (MXT_PRESS | MXT_MOVE)))
 550                 return;
 551
 552         x = (message->message[1] << 2) | ((message->message[3] & ~0x3f) >> 6);
 553         y = (message->message[2] << 2) | ((message->message[3] & ~0xf3) >> 2);
 554         area = message->message[4];
 555
 556         dev_dbg(dev, "[%d] %s x: %d, y: %d, area: %d\n", id,
 557                 status & MXT_MOVE ? "moved" : "pressed",
 558                 x, y, area);
 559
 560         finger[id].status = status & MXT_MOVE ?
 561                                 MXT_MOVE : MXT_PRESS;
 562         finger[id].x = x;
 563         finger[id].y = y;
 564         finger[id].area = area;
 565
 566         mxt_input_report(data, id);
 567 }
 568
 569 static irqreturn_t mxt_interrupt(int irq, void *dev_id)
 570 {
 571         struct mxt_data *data = dev_id;
 572         struct mxt_message message;
 573         struct mxt_object *object;
 574         struct device *dev = &data->client->dev;
 575         int id;
 576         u8 reportid;
 577         u8 max_reportid;
 578         u8 min_reportid;
 579
 580         do {
 581                 if (mxt_read_message(data, &message)) {
 582                         dev_err(dev, "Failed to read message\n");
 583                         goto end;
 584                 }
 585
 586                 reportid = message.reportid;
 587
 588                 /* whether reportid is thing of MXT_TOUCH_MULTI */
 589                 object = mxt_get_object(data, MXT_TOUCH_MULTI);
 590                 if (!object)
 591                         goto end;
 592
 593                 max_reportid = object->max_reportid;
 594                 min_reportid = max_reportid - object->num_report_ids + 1;
 595                 id = reportid - min_reportid;
 596
 597                 if (reportid >= min_reportid && reportid <= max_reportid)
 598                         mxt_input_touchevent(data, &message, id);
 599                 else
 600                         mxt_dump_message(dev, &message);
 601         } while (reportid != 0xff);
 602
 603 end:
 604         return IRQ_HANDLED;
 605 }
 606
 607 static int mxt_check_reg_init(struct mxt_data *data)
 608 {
 609         const struct mxt_platform_data *pdata = data->pdata;
 610         struct mxt_object *object;
 611         struct device *dev = &data->client->dev;
 612         int index = 0;
 613         int i, j, config_offset;
 614
 615         if (!pdata->config) {
 616                 dev_dbg(dev, "No cfg data defined, skipping reg init\n");
 617                 return 0;
 618         }
 619
 620         for (i = 0; i < data->info.object_num; i++) {
 621                 object = data->object_table + i;
 622
 623                 if (!mxt_object_writable(object->type))
 624                         continue;
 625
 626                 for (j = 0; j < object->size + 1; j++) {
 627                         config_offset = index + j;
 628                         if (config_offset > pdata->config_length) {
 629                                 dev_err(dev, "Not enough config data!\n");
 630                                 return -EINVAL;
 631                         }
 632                         mxt_write_object(data, object->type, j,
 633                                          pdata->config[config_offset]);
 634                 }
 635                 index += object->size + 1;
 636         }
 637
 638         return 0;
 639 }
 640
 641 static int mxt_make_highchg(struct mxt_data *data)
 642 {
 643         struct device *dev = &data->client->dev;
 644         struct mxt_message message;
 645         int count = 10;
 646         int error;
 647
 648         /* Read dummy message to make high CHG pin */
 649         do {
 650                 error = mxt_read_message(data, &message);
 651                 if (error)
 652                         return error;
 653         } while (message.reportid != 0xff && --count);
 654
 655         if (!count) {
 656                 dev_err(dev, "CHG pin isn't cleared\n");
 657                 return -EBUSY;
 658         }
 659
 660         return 0;
 661 }
 662
 663 static void mxt_handle_pdata(struct mxt_data *data)
 664 {
 665         const struct mxt_platform_data *pdata = data->pdata;
 666         u8 voltage;
 667
 668         /* Set touchscreen lines */
 669         mxt_write_object(data, MXT_TOUCH_MULTI, MXT_TOUCH_XSIZE,
 670                         pdata->x_line);
 671         mxt_write_object(data, MXT_TOUCH_MULTI, MXT_TOUCH_YSIZE,
 672                         pdata->y_line);
 673
 674         /* Set touchscreen orient */
 675         mxt_write_object(data, MXT_TOUCH_MULTI, MXT_TOUCH_ORIENT,
 676                         pdata->orient);
 677
 678         /* Set touchscreen burst length */
 679         mxt_write_object(data, MXT_TOUCH_MULTI,
 680                         MXT_TOUCH_BLEN, pdata->blen);
 681
 682         /* Set touchscreen threshold */
 683         mxt_write_object(data, MXT_TOUCH_MULTI,
 684                         MXT_TOUCH_TCHTHR, pdata->threshold);
 685
 686         /* Set touchscreen resolution */
 687         mxt_write_object(data, MXT_TOUCH_MULTI,
 688                         MXT_TOUCH_XRANGE_LSB, (pdata->x_size - 1) & 0xff);
 689         mxt_write_object(data, MXT_TOUCH_MULTI,
 690                         MXT_TOUCH_XRANGE_MSB, (pdata->x_size - 1) >> 8);
 691         mxt_write_object(data, MXT_TOUCH_MULTI,
 692                         MXT_TOUCH_YRANGE_LSB, (pdata->y_size - 1) & 0xff);
 693         mxt_write_object(data, MXT_TOUCH_MULTI,
 694                         MXT_TOUCH_YRANGE_MSB, (pdata->y_size - 1) >> 8);
 695
 696         /* Set touchscreen voltage */
 697         if (pdata->voltage) {
 698                 if (pdata->voltage < MXT_VOLTAGE_DEFAULT) {
 699                         voltage = (MXT_VOLTAGE_DEFAULT - pdata->voltage) /
 700                                 MXT_VOLTAGE_STEP;
 701                         voltage = 0xff - voltage + 1;
 702                 } else
 703                         voltage = (pdata->voltage - MXT_VOLTAGE_DEFAULT) /
 704                                 MXT_VOLTAGE_STEP;
 705
 706                 mxt_write_object(data, MXT_SPT_CTECONFIG,
 707                                 MXT_CTE_VOLTAGE, voltage);
 708         }
 709 }
 710
 711 static int mxt_get_info(struct mxt_data *data)
 712 {
 713         struct i2c_client *client = data->client;
 714         struct mxt_info *info = &data->info;
 715         int error;
 716         u8 val;
 717
 718         error = mxt_read_reg(client, MXT_FAMILY_ID, &val);
 719         if (error)
 720                 return error;
 721         info->family_id = val;
 722
 723         error = mxt_read_reg(client, MXT_VARIANT_ID, &val);
 724         if (error)
 725                 return error;
 726         info->variant_id = val;
 727
 728         error = mxt_read_reg(client, MXT_VERSION, &val);
 729         if (error)
 730                 return error;
 731         info->version = val;
 732
 733         error = mxt_read_reg(client, MXT_BUILD, &val);
 734         if (error)
 735                 return error;
 736         info->build = val;
 737
 738         error = mxt_read_reg(client, MXT_OBJECT_NUM, &val);
 739         if (error)
 740                 return error;
 741         info->object_num = val;
 742
 743         return 0;
 744 }
 745
 746 static int mxt_get_object_table(struct mxt_data *data)
 747 {
 748         int error;
 749         int i;
 750         u16 reg;
 751         u8 reportid = 0;
 752         u8 buf[MXT_OBJECT_SIZE];
 753
 754         for (i = 0; i < data->info.object_num; i++) {
 755                 struct mxt_object *object = data->object_table + i;
 756
 757                 reg = MXT_OBJECT_START + MXT_OBJECT_SIZE * i;
 758                 error = mxt_read_object_table(data->client, reg, buf);
 759                 if (error)
 760                         return error;
 761
 762                 object->type = buf[0];
 763                 object->start_address = (buf[2] << 8) | buf[1];
 764                 object->size = buf[3];
 765                 object->instances = buf[4];
 766                 object->num_report_ids = buf[5];
 767
 768                 if (object->num_report_ids) {
 769                         reportid += object->num_report_ids *
 770                                         (object->instances + 1);
 771                         object->max_reportid = reportid;
 772                 }
 773         }
 774
 775         return 0;
 776 }
 777
 778 static int mxt_initialize(struct mxt_data *data)
 779 {
 780         struct i2c_client *client = data->client;
 781         struct mxt_info *info = &data->info;
 782         int error;
 783         u8 val;
 784
 785         error = mxt_get_info(data);
 786         if (error)
 787                 return error;
 788
 789         data->object_table = kcalloc(info->object_num,
 790                                      sizeof(struct mxt_object),
 791                                      GFP_KERNEL);
 792         if (!data->object_table) {
 793                 dev_err(&client->dev, "Failed to allocate memory\n");
 794                 return -ENOMEM;
 795         }
 796
 797         /* Get object table information */
 798         error = mxt_get_object_table(data);
 799         if (error)
 800                 return error;
 801
 802         /* Check register init values */
 803         error = mxt_check_reg_init(data);
 804         if (error)
 805                 return error;
 806
 807         error = mxt_make_highchg(data);
 808         if (error)
 809                 return error;
 810
 811         mxt_handle_pdata(data);
 812
 813         /* Backup to memory */
 814         mxt_write_object(data, MXT_GEN_COMMAND,
 815                         MXT_COMMAND_BACKUPNV,
 816                         MXT_BACKUP_VALUE);
 817         msleep(MXT_BACKUP_TIME);
 818
 819         /* Soft reset */
 820         mxt_write_object(data, MXT_GEN_COMMAND,
 821                         MXT_COMMAND_RESET, 1);
 822         msleep(MXT_RESET_TIME);
 823
 824         /* Update matrix size at info struct */
 825         error = mxt_read_reg(client, MXT_MATRIX_X_SIZE, &val);
 826         if (error)
 827                 return error;
 828         info->matrix_xsize = val;
 829
 830         error = mxt_read_reg(client, MXT_MATRIX_Y_SIZE, &val);
 831         if (error)
 832                 return error;
 833         info->matrix_ysize = val;
 834
 835         dev_info(&client->dev,
 836                         "Family ID: %d Variant ID: %d Version: %d Build: %d\n",
 837                         info->family_id, info->variant_id, info->version,
 838                         info->build);
 839
 840         dev_info(&client->dev,
 841                         "Matrix X Size: %d Matrix Y Size: %d Object Num: %d\n",
 842                         info->matrix_xsize, info->matrix_ysize,
 843                         info->object_num);
 844
 845         return 0;
 846 }
 847
 848 static ssize_t mxt_object_show(struct device *dev,
 849                                     struct device_attribute *attr, char *buf)
 850 {
 851         struct mxt_data *data = dev_get_drvdata(dev);
 852         struct mxt_object *object;
 853         int count = 0;
 854         int i, j;
 855         int error;
 856         u8 val;
 857
 858         for (i = 0; i < data->info.object_num; i++) {
 859                 object = data->object_table + i;
 860
 861                 count += sprintf(buf + count,
 862                                 "Object Table Element %d(Type %d)\n",
 863                                 i + 1, object->type);
 864
 865                 if (!mxt_object_readable(object->type)) {
 866                         count += sprintf(buf + count, "\n");
 867                         continue;
 868                 }
 869
 870                 for (j = 0; j < object->size + 1; j++) {
 871                         error = mxt_read_object(data,
 872                                                 object->type, j, &val);
 873                         if (error)
 874                                 return error;
 875
 876                         count += sprintf(buf + count,
 877                                         "  Byte %d: 0x%x (%d)\n", j, val, val);
 878                 }
 879
 880                 count += sprintf(buf + count, "\n");
 881         }
 882
 883         return count;
 884 }
 885
 886 static int mxt_load_fw(struct device *dev, const char *fn)
 887 {
 888         struct mxt_data *data = dev_get_drvdata(dev);
 889         struct i2c_client *client = data->client;
 890         const struct firmware *fw = NULL;
 891         unsigned int frame_size;
 892         unsigned int pos = 0;
 893         int ret;
 894
 895         ret = request_firmware(&fw, fn, dev);
 896         if (ret) {
 897                 dev_err(dev, "Unable to open firmware %s\n", fn);
 898                 return ret;
 899         }
 900
 901         /* Change to the bootloader mode */
 902         mxt_write_object(data, MXT_GEN_COMMAND,
 903                         MXT_COMMAND_RESET, MXT_BOOT_VALUE);
 904         msleep(MXT_RESET_TIME);
 905
 906         /* Change to slave address of bootloader */
 907         if (client->addr == MXT_APP_LOW)
 908                 client->addr = MXT_BOOT_LOW;
 909         else
 910                 client->addr = MXT_BOOT_HIGH;
 911
 912         ret = mxt_check_bootloader(client, MXT_WAITING_BOOTLOAD_CMD);
 913         if (ret)
 914                 goto out;
 915
 916         /* Unlock bootloader */
 917         mxt_unlock_bootloader(client);
 918
 919         while (pos < fw->size) {
 920                 ret = mxt_check_bootloader(client,
 921                                                 MXT_WAITING_FRAME_DATA);
 922                 if (ret)
 923                         goto out;
 924
 925                 frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
 926
 927                 /* We should add 2 at frame size as the the firmware data is not
 928                  * included the CRC bytes.
 929                  */
 930                 frame_size += 2;
 931
 932                 /* Write one frame to device */
 933                 mxt_fw_write(client, fw->data + pos, frame_size);
 934
 935                 ret = mxt_check_bootloader(client,
 936                                                 MXT_FRAME_CRC_PASS);
 937                 if (ret)
 938                         goto out;
 939
 940                 pos += frame_size;
 941
 942                 dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size);
 943         }
 944
 945 out:
 946         release_firmware(fw);
 947
 948         /* Change to slave address of application */
 949         if (client->addr == MXT_BOOT_LOW)
 950                 client->addr = MXT_APP_LOW;
 951         else
 952                 client->addr = MXT_APP_HIGH;
 953
 954         return ret;
 955 }
 956
 957 static ssize_t mxt_update_fw_store(struct device *dev,
 958                                         struct device_attribute *attr,
 959                                         const char *buf, size_t count)
 960 {
 961         struct mxt_data *data = dev_get_drvdata(dev);
 962         int error;
 963
 964         disable_irq(data->irq);
 965
 966         error = mxt_load_fw(dev, MXT_FW_NAME);
 967         if (error) {
 968                 dev_err(dev, "The firmware update failed(%d)\n", error);
 969                 count = error;
 970         } else {
 971                 dev_dbg(dev, "The firmware update succeeded\n");
 972
 973                 /* Wait for reset */
 974                 msleep(MXT_FWRESET_TIME);
 975
 976                 kfree(data->object_table);
 977                 data->object_table = NULL;
 978
 979                 mxt_initialize(data);
 980         }
 981
 982         enable_irq(data->irq);
 983
 984         return count;
 985 }
 986
 987 static DEVICE_ATTR(object, 0444, mxt_object_show, NULL);
 988 static DEVICE_ATTR(update_fw, 0664, NULL, mxt_update_fw_store);
 989
 990 static struct attribute *mxt_attrs[] = {
 991         &dev_attr_object.attr,
 992         &dev_attr_update_fw.attr,
 993         NULL
 994 };
 995
 996 static const struct attribute_group mxt_attr_group = {
 997         .attrs = mxt_attrs,
 998 };
 999
1000 static void mxt_start(struct mxt_data *data)
1001 {
1002         /* Touch enable */
1003         mxt_write_object(data,
1004                         MXT_TOUCH_MULTI, MXT_TOUCH_CTRL, 0x83);
1005 }
1006
1007 static void mxt_stop(struct mxt_data *data)
1008 {
1009         /* Touch disable */
1010         mxt_write_object(data,
1011                         MXT_TOUCH_MULTI, MXT_TOUCH_CTRL, 0);
1012 }
1013
1014 static int mxt_input_open(struct input_dev *dev)
1015 {
1016         struct mxt_data *data = input_get_drvdata(dev);
1017
1018         mxt_start(data);
1019
1020         return 0;
1021 }
1022
1023 static void mxt_input_close(struct input_dev *dev)
1024 {
1025         struct mxt_data *data = input_get_drvdata(dev);
1026
1027         mxt_stop(data);
1028 }
1029
1030 static int __devinit mxt_probe(struct i2c_client *client,
1031                 const struct i2c_device_id *id)
1032 {
1033         const struct mxt_platform_data *pdata = client->dev.platform_data;
1034         struct mxt_data *data;
1035         struct input_dev *input_dev;
1036         int error;
1037
1038         if (!pdata)
1039                 return -EINVAL;
1040
1041         data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL);
1042         input_dev = input_allocate_device();
1043         if (!data || !input_dev) {
1044                 dev_err(&client->dev, "Failed to allocate memory\n");
1045                 error = -ENOMEM;
1046                 goto err_free_mem;
1047         }
1048
1049         input_dev->name = "Atmel maXTouch Touchscreen";
1050         input_dev->id.bustype = BUS_I2C;
1051         input_dev->dev.parent = &client->dev;
1052         input_dev->open = mxt_input_open;
1053         input_dev->close = mxt_input_close;
1054
1055         __set_bit(EV_ABS, input_dev->evbit);
1056         __set_bit(EV_KEY, input_dev->evbit);
1057         __set_bit(BTN_TOUCH, input_dev->keybit);
1058
1059         /* For single touch */
1060         input_set_abs_params(input_dev, ABS_X,
1061                              0, MXT_MAX_XC, 0, 0);
1062         input_set_abs_params(input_dev, ABS_Y,
1063                              0, MXT_MAX_YC, 0, 0);
1064
1065         /* For multi touch */
1066         input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
1067                              0, MXT_MAX_AREA, 0, 0);
1068         input_set_abs_params(input_dev, ABS_MT_POSITION_X,
1069                              0, MXT_MAX_XC, 0, 0);
1070         input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
1071                              0, MXT_MAX_YC, 0, 0);
1072
1073         input_set_drvdata(input_dev, data);
1074
1075         data->client = client;
1076         data->input_dev = input_dev;
1077         data->pdata = pdata;
1078         data->irq = client->irq;
1079
1080         i2c_set_clientdata(client, data);
1081
1082         error = mxt_initialize(data);
1083         if (error)
1084                 goto err_free_object;
1085
1086         error = request_threaded_irq(client->irq, NULL, mxt_interrupt,
1087                         pdata->irqflags, client->dev.driver->name, data);
1088         if (error) {
1089                 dev_err(&client->dev, "Failed to register interrupt\n");
1090                 goto err_free_object;
1091         }
1092
1093         error = input_register_device(input_dev);
1094         if (error)
1095                 goto err_free_irq;
1096
1097         error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
1098         if (error)
1099                 goto err_unregister_device;
1100
1101         return 0;
1102
1103 err_unregister_device:
1104         input_unregister_device(input_dev);
1105         input_dev = NULL;
1106 err_free_irq:
1107         free_irq(client->irq, data);
1108 err_free_object:
1109         kfree(data->object_table);
1110 err_free_mem:
1111         input_free_device(input_dev);
1112         kfree(data);
1113         return error;
1114 }
1115
1116 static int __devexit mxt_remove(struct i2c_client *client)
1117 {
1118         struct mxt_data *data = i2c_get_clientdata(client);
1119
1120         sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
1121         free_irq(data->irq, data);
1122         input_unregister_device(data->input_dev);
1123         kfree(data->object_table);
1124         kfree(data);
1125
1126         return 0;
1127 }
1128
1129 #ifdef CONFIG_PM
1130 static int mxt_suspend(struct device *dev)
1131 {
1132         struct i2c_client *client = to_i2c_client(dev);
1133         struct mxt_data *data = i2c_get_clientdata(client);
1134         struct input_dev *input_dev = data->input_dev;
1135
1136         mutex_lock(&input_dev->mutex);
1137
1138         if (input_dev->users)
1139                 mxt_stop(data);
1140
1141         mutex_unlock(&input_dev->mutex);
1142
1143         return 0;
1144 }
1145
1146 static int mxt_resume(struct device *dev)
1147 {
1148         struct i2c_client *client = to_i2c_client(dev);
1149         struct mxt_data *data = i2c_get_clientdata(client);
1150         struct input_dev *input_dev = data->input_dev;
1151
1152         /* Soft reset */
1153         mxt_write_object(data, MXT_GEN_COMMAND,
1154                         MXT_COMMAND_RESET, 1);
1155
1156         msleep(MXT_RESET_TIME);
1157
1158         mutex_lock(&input_dev->mutex);
1159
1160         if (input_dev->users)
1161                 mxt_start(data);
1162
1163         mutex_unlock(&input_dev->mutex);
1164
1165         return 0;
1166 }
1167
1168 static const struct dev_pm_ops mxt_pm_ops = {
1169         .suspend        = mxt_suspend,
1170         .resume         = mxt_resume,
1171 };
1172 #endif
1173
1174 static const struct i2c_device_id mxt_id[] = {
1175         { "qt602240_ts", 0 },
1176         { "atmel_mxt_ts", 0 },
1177         { "mXT224", 0 },
1178         { }
1179 };
1180 MODULE_DEVICE_TABLE(i2c, mxt_id);
1181
1182 static struct i2c_driver mxt_driver = {
1183         .driver = {
1184                 .name   = "atmel_mxt_ts",
1185                 .owner  = THIS_MODULE,
1186 #ifdef CONFIG_PM
1187                 .pm     = &mxt_pm_ops,
1188 #endif
1189         },
1190         .probe          = mxt_probe,
1191         .remove         = __devexit_p(mxt_remove),
1192         .id_table       = mxt_id,
1193 };
1194
1195 static int __init mxt_init(void)
1196 {
1197         return i2c_add_driver(&mxt_driver);
1198 }
1199
1200 static void __exit mxt_exit(void)
1201 {
1202         i2c_del_driver(&mxt_driver);
1203 }
1204
1205 module_init(mxt_init);
1206 module_exit(mxt_exit);
1207
1208 /* Module information */
1209 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
1210 MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
1211 MODULE_LICENSE("GPL");