drivers/input/touchscreen/xpt2046_cbn_ts.c

   1 /*
   2  * drivers/input/touchscreen/xpt2046_cbn_ts.c - driver for rk2818 spi xpt2046 calibration device and console
   3  *
   4  * Copyright (C) 2010 ROCKCHIP, Inc.
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/hwmon.h>
  17 #include <linux/init.h>
  18 #include <linux/err.h>
  19 #include <linux/delay.h>
  20 #include <linux/input.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/slab.h>
  23 #include <linux/gpio.h>
  24 #include <linux/spi/spi.h>
  25 #include <asm/irq.h>
  26
  27 #include "xpt2046_cbn_ts.h"
  28 #include "calibration_ts.h"
  29 /*
  30  * This code has been heavily tested on a Nokia 770, and lightly
  31  * tested on other xpt2046 devices (OSK/Mistral, Lubbock).
  32  * TSC2046 is just newer xpt2046 silicon.
  33  * Support for ads7843 tested on Atmel at91sam926x-EK.
  34  * Support for ads7845 has only been stubbed in.
  35  *
  36  * IRQ handling needs a workaround because of a shortcoming in handling
  37  * edge triggered IRQs on some platforms like the OMAP1/2. These
  38  * platforms don't handle the ARM lazy IRQ disabling properly, thus we
  39  * have to maintain our own SW IRQ disabled status. This should be
  40  * removed as soon as the affected platform's IRQ handling is fixed.
  41  *
  42  * app note sbaa036 talks in more detail about accurate sampling...
  43  * that ought to help in situations like LCDs inducing noise (which
  44  * can also be helped by using synch signals) and more generally.
  45  * This driver tries to utilize the measures described in the app
  46  * note. The strength of filtering can be set in the board-* specific
  47  * files.
  48  */
  49 #define XPT2046_DEBUG                   0
  50 #if XPT2046_DEBUG
  51         #define xpt2046printk(msg...)   printk(msg);
  52 #else
  53         #define xpt2046printk(msg...)
  54 #endif
  55
  56 //#define TS_POLL_DELAY (15 * 1000000)  /* ns delay before the first sample */
  57 //#define TS_POLL_PERIOD        (15 * 1000000)  /* ns delay between samples */
  58 #define TS_POLL_DELAY   (10 * 1000000)  /* ns delay before the first sample */
  59 #define TS_POLL_PERIOD  (20 * 1000000)  /* ns delay between samples */
  60
  61
  62 #define DEBOUNCE_REPTIME  3
  63 /* this driver doesn't aim at the peak continuous sample rate */
  64 #define SAMPLE_BITS     (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
  65
  66 struct ts_event {
  67         /* For portability, we can't read 12 bit values using SPI (which
  68          * would make the controller deliver them as native byteorder u16
  69          * with msbs zeroed).  Instead, we read them as two 8-bit values,
  70          * *** WHICH NEED BYTESWAPPING *** and range adjustment.
  71          */
  72         u16     x;
  73         u16     y;
  74         int     ignore;
  75 };
  76
  77 /*
  78  * We allocate this separately to avoid cache line sharing issues when
  79  * driver is used with DMA-based SPI controllers (like atmel_spi) on
  80  * systems where main memory is not DMA-coherent (most non-x86 boards).
  81  */
  82 struct xpt2046_packet {
  83         u8                      read_x, read_y, pwrdown;
  84         u16                     dummy;          /* for the pwrdown read */
  85         struct ts_event         tc;
  86 };
  87
  88 struct xpt2046 {
  89         struct input_dev        *input;
  90         char                    phys[32];
  91         char                    name[32];
  92
  93         struct spi_device       *spi;
  94
  95         u16                     model;
  96         bool                    swap_xy;
  97
  98         struct xpt2046_packet   *packet;
  99
 100         struct spi_transfer     xfer[18];
 101         struct spi_message      msg[5];
 102         struct spi_message      *last_msg;
 103         int                     msg_idx;
 104         int                     read_cnt;
 105         int                     read_rep;
 106         int                     last_read;
 107
 108         u16                     debounce_max;
 109         u16                     debounce_tol;
 110         u16                     debounce_rep;
 111
 112         u16                     penirq_recheck_delay_usecs;
 113
 114         spinlock_t              lock;
 115         struct hrtimer          timer;
 116         unsigned                pendown:1;      /* P: lock */
 117         unsigned                pending:1;      /* P: lock */
 118 // FIXME remove "irq_disabled"
 119         unsigned                irq_disabled:1; /* P: lock */
 120         unsigned                disabled:1;
 121         unsigned                is_suspended:1;
 122
 123         int                     (*filter)(void *data, int data_idx, int *val);
 124         void                    *filter_data;
 125         void                    (*filter_cleanup)(void *data);
 126         int                     (*get_pendown_state)(void);
 127         int                     gpio_pendown;
 128
 129         void                    (*wait_for_sync)(void);
 130 };
 131
 132 /* leave chip selected when we're done, for quicker re-select? */
 133 #if     0
 134 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
 135 #else
 136 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
 137 #endif
 138
 139 /*--------------------------------------------------------------------------*/
 140
 141 /* The xpt2046 has touchscreen and other sensors.
 142  * Earlier xpt2046 chips are somewhat compatible.
 143  */
 144 #define XPT2046_START                   (1 << 7)
 145 #define XPT2046_A2A1A0_d_y              (1 << 4)        /* differential */
 146 #define XPT2046_A2A1A0_d_z1             (3 << 4)        /* differential */
 147 #define XPT2046_A2A1A0_d_z2             (4 << 4)        /* differential */
 148 #define XPT2046_A2A1A0_d_x              (5 << 4)        /* differential */
 149 #define XPT2046_A2A1A0_temp0    (0 << 4)        /* non-differential */
 150 #define XPT2046_A2A1A0_vbatt    (2 << 4)        /* non-differential */
 151 #define XPT2046_A2A1A0_vaux             (6 << 4)        /* non-differential */
 152 #define XPT2046_A2A1A0_temp1    (7 << 4)        /* non-differential */
 153 #define XPT2046_8_BIT                   (1 << 3)
 154 #define XPT2046_12_BIT                  (0 << 3)
 155 #define XPT2046_SER                             (1 << 2)        /* non-differential */
 156 #define XPT2046_DFR                             (0 << 2)        /* differential */
 157 #define XPT2046_PD10_PDOWN              (0 << 0)        /* lowpower mode + penirq */
 158 #define XPT2046_PD10_ADC_ON             (1 << 0)        /* ADC on */
 159 #define XPT2046_PD10_REF_ON             (2 << 0)        /* vREF on + penirq */
 160 #define XPT2046_PD10_ALL_ON             (3 << 0)        /* ADC + vREF on */
 161
 162 #define MAX_12BIT       ((1<<12)-1)
 163
 164 /* leave ADC powered up (disables penirq) between differential samples */
 165 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
 166         | XPT2046_12_BIT | XPT2046_DFR | \
 167         (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
 168
 169 #define READ_Y(vref)    (READ_12BIT_DFR(y,  1, vref))
 170 #define READ_Z1(vref)   (READ_12BIT_DFR(z1, 1, vref))
 171 #define READ_Z2(vref)   (READ_12BIT_DFR(z2, 1, vref))
 172
 173 #define READ_X(vref)    (READ_12BIT_DFR(x,  1, vref))
 174 #define PWRDOWN         (READ_12BIT_DFR(y,  0, 0))      /* LAST */
 175
 176 /* single-ended samples need to first power up reference voltage;
 177  * we leave both ADC and VREF powered
 178  */
 179 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
 180         | XPT2046_12_BIT | XPT2046_SER)
 181
 182 #define REF_ON  (READ_12BIT_DFR(x, 1, 1))
 183 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
 184
 185 /*--------------------------------------------------------------------------*/
 186 /*
 187  * touchscreen sensors  use differential conversions.
 188  */
 189
 190 struct dfr_req {
 191         u8                      command;
 192         u8                      pwrdown;
 193         u16                     dummy;          /* for the pwrdown read */
 194         __be16                  sample;
 195         struct spi_message      msg;
 196         struct spi_transfer     xfer[4];
 197 };
 198 typedef struct
 199 {
 200     s16 x;
 201     s16 y;
 202 }POINT;
 203
 204 #if (0)
 205 static struct xpt2046_platform_data xpt2046_info = {
 206         .model                  = 2046,
 207         .keep_vref_on   = 1,
 208         .swap_xy                = 0,
 209         .x_min                  = 0,
 210         .x_max                  = 800,
 211         .y_min                  = 0,
 212         .y_max                  = 480,
 213         .debounce_max           = 7,
 214         .debounce_rep           = DEBOUNCE_REPTIME,
 215         .debounce_tol           = 20,
 216         .gpio_pendown           = RK2818_PIN_PE3,
 217         .penirq_recheck_delay_usecs = 1,
 218
 219 };
 220 #endif /* (0) */
 221 static void xpt2046_enable(struct xpt2046 *ts);
 222 static void xpt2046_disable(struct xpt2046 *ts);
 223
 224 static POINT gADPoint;
 225 int screen_x[] = { 50,  750,   50,  750,  400};
 226 int screen_y[] = { 40,   40,  440,  440,  240};
 227 int uncali_x[] = {329, 3750,  331, 3757, 2046};
 228 int uncali_y[] = {593,  532, 3675, 3655, 2121};
 229
 230 // This code is touch check
 231 static ssize_t xpt2046_mode_show(struct device_driver *drv,char *buf)
 232 {
 233     int count;
 234
 235         count = sprintf(buf,"xpt2046_mode_show:%d,%d,%d,%d,%d,%d,%d,%d,%d,%d\n",
 236                         uncali_x[0], uncali_y[0],
 237                         uncali_x[1], uncali_y[1],
 238                         uncali_x[2], uncali_y[2],
 239                         uncali_x[3], uncali_y[3],
 240                         uncali_x[4], uncali_y[4]);
 241
 242         printk("buf: %s", buf);
 243
 244         return count;
 245 }
 246
 247 static ssize_t xpt2046_mode_store(struct device_driver * drv, const char * buf, size_t count)
 248 {
 249     int i, j = 0;
 250     char temp[5];
 251
 252     printk("xpt2046_mode_store: %s\n", buf);
 253
 254     for (i = 0; i < 5; i++)
 255     {
 256         strncpy(temp, buf + 5 * (j++), 4);
 257         uncali_x[i] = simple_strtol(temp, NULL, 10);
 258         strncpy(temp, buf + 5 * (j++), 4);
 259         uncali_y[i] = simple_strtol(temp, NULL, 10);
 260         printk("SN=%d uncali_x=%d uncali_y=%d\n",
 261                 i, uncali_x[i], uncali_y[i]);
 262     }
 263
 264         return count;
 265 }
 266
 267 //This code is Touch adc simple value
 268 static ssize_t xpt2046_adc_show(struct device_driver *drv,char *buf)
 269 {
 270     printk("xpt2046_adc_show: x=%d y=%d\n", gADPoint.x, gADPoint.y);
 271
 272         return sprintf(buf, "%d,%d\n", gADPoint.x, gADPoint.y);
 273 }
 274
 275 static ssize_t xpt2046_cali_status(struct device_driver *drv, char *buf)
 276 {
 277     int ret;
 278
 279     ret = TouchPanelSetCalibration(4, screen_x, screen_y, uncali_x, uncali_y);
 280     if (ret == 1)
 281         ret = sprintf(buf, "successful\n");
 282     else
 283         ret = sprintf(buf, "fail\n");
 284
 285     printk("xpt2046_cali_status: buf=<%s", buf);
 286
 287         return ret;
 288 }
 289
 290 //static DEVICE_ATTR(adc, 0666, xpt2046_adc_show, NULL);
 291 //static DEVICE_ATTR(calistatus, 0666, xpt2046_cali_status, NULL);
 292 //static DEVICE_ATTR(mode, 0666, xpt2046_mode_show, xpt2046_mode_store);
 293 static DRIVER_ATTR(touchadc, 0666, xpt2046_adc_show, NULL);
 294 static DRIVER_ATTR(calistatus, 0666, xpt2046_cali_status, NULL);
 295 static DRIVER_ATTR(touchcheck, 0666, xpt2046_mode_show, xpt2046_mode_store);
 296 #if (0)
 297 static struct attribute *xpt2046_attributes[] = {
 298         &dev_attr_touchadc.attr,
 299         &dev_attr_calistatus.attr,
 300         &dev_attr_touchcheck.attr,
 301         NULL,
 302 };
 303
 304 static struct attribute_group xpt2046_attr_group = {
 305         .attrs = xpt2046_attributes,
 306 };
 307 #endif /* (0) */
 308
 309 static int device_suspended(struct device *dev)
 310 {
 311         struct xpt2046 *ts = dev_get_drvdata(dev);
 312         return ts->is_suspended || ts->disabled;
 313 }
 314
 315 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
 316 {
 317         struct spi_device       *spi = to_spi_device(dev);
 318         struct xpt2046          *ts = dev_get_drvdata(dev);
 319         struct dfr_req          *req = kzalloc(sizeof *req, GFP_KERNEL);
 320         int                     status;
 321
 322         if (!req)
 323                 return -ENOMEM;
 324
 325         spi_message_init(&req->msg);
 326
 327         /* take sample */
 328         req->command = (u8) command;
 329         req->xfer[0].tx_buf = &req->command;
 330         req->xfer[0].len = 1;
 331         spi_message_add_tail(&req->xfer[0], &req->msg);
 332
 333         req->xfer[1].rx_buf = &req->sample;
 334         req->xfer[1].len = 2;
 335         spi_message_add_tail(&req->xfer[1], &req->msg);
 336
 337         /* converter in low power mode & enable PENIRQ */
 338         req->pwrdown= PWRDOWN;
 339         req->xfer[2].tx_buf = &req->pwrdown;
 340         req->xfer[2].len = 1;
 341         spi_message_add_tail(&req->xfer[2], &req->msg);
 342
 343         req->xfer[3].rx_buf = &req->dummy;
 344         req->xfer[3].len = 2;
 345         CS_CHANGE(req->xfer[3]);
 346         spi_message_add_tail(&req->xfer[3], &req->msg);
 347
 348         ts->irq_disabled = 1;
 349         disable_irq(spi->irq);
 350         status = spi_sync(spi, &req->msg);
 351         ts->irq_disabled = 0;
 352         enable_irq(spi->irq);
 353
 354         if (status == 0) {
 355                 /* on-wire is a must-ignore bit, a BE12 value, then padding */
 356                 status = be16_to_cpu(req->sample);
 357                 status = status >> 3;
 358                 status &= 0x0fff;
 359                 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
 360         }
 361
 362         kfree(req);
 363         return status;
 364 }
 365
 366
 367
 368 /*--------------------------------------------------------------------------*/
 369
 370 static int get_pendown_state(struct xpt2046 *ts)
 371 {
 372         if (ts->get_pendown_state)
 373                 return ts->get_pendown_state();
 374
 375         return !gpio_get_value(ts->gpio_pendown);
 376 }
 377
 378 static void null_wait_for_sync(void)
 379 {
 380
 381 }
 382
 383 /*
 384  * PENIRQ only kicks the timer.  The timer only reissues the SPI transfer,
 385  * to retrieve touchscreen status.
 386  *
 387  * The SPI transfer completion callback does the real work.  It reports
 388  * touchscreen events and reactivates the timer (or IRQ) as appropriate.
 389  */
 390
 391 static void xpt2046_rx(void *xpt)
 392 {
 393         struct xpt2046          *ts = xpt;
 394         struct xpt2046_packet   *packet = ts->packet;
 395         unsigned                Rt = 1;
 396         u16                     x, y;
 397         int             xd,yd;
 398         /* xpt2046_rx_val() did in-place conversion (including byteswap) from
 399          * on-the-wire format as part of debouncing to get stable readings.
 400          */
 401         x = packet->tc.x;
 402         y = packet->tc.y;
 403
 404         xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
 405
 406         /* range filtering */
 407         if (x == MAX_12BIT)
 408                 x = 0;
 409
 410         /* Sample found inconsistent by debouncing or pressure is beyond
 411          * the maximum. Don't report it to user space, repeat at least
 412          * once more the measurement
 413          */
 414         if (packet->tc.ignore) {
 415
 416                 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
 417
 418                 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 419                               HRTIMER_MODE_REL);
 420                 return;
 421         }
 422
 423         /* Maybe check the pendown state before reporting. This discards
 424          * false readings when the pen is lifted.
 425          */
 426         if (ts->penirq_recheck_delay_usecs) {
 427                 udelay(ts->penirq_recheck_delay_usecs);
 428                 if (!get_pendown_state(ts))
 429                 {
 430                         xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
 431                         Rt = 0;
 432                 }
 433         }
 434
 435         /* NOTE: We can't rely on the pressure to determine the pen down
 436          * state, even this controller has a pressure sensor.  The pressure
 437          * value can fluctuate for quite a while after lifting the pen and
 438          * in some cases may not even settle at the expected value.
 439          *
 440          * The only safe way to check for the pen up condition is in the
 441          * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 442          */
 443         if (Rt) {
 444                 struct input_dev *input = ts->input;
 445                 if (!ts->pendown) {
 446                         input_report_key(input, BTN_TOUCH, 1);
 447                         ts->pendown = 1;
 448                         xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 449                 }
 450
 451                 TouchPanelCalibrateAPoint(x, y, &xd, &yd);
 452
 453         xd = xd / 4;
 454         yd = yd / 4;
 455                 gADPoint.x = x;
 456         gADPoint.y = y;
 457
 458                 if (ts->swap_xy)
 459                         swap(x, y);
 460
 461
 462                 input_report_abs(input, ABS_X, xd);
 463                 input_report_abs(input, ABS_Y, yd);
 464
 465                 input_sync(input);
 466                 xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,xd, yd);
 467         }
 468
 469         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 470                         HRTIMER_MODE_REL);
 471 }
 472
 473 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
 474 {
 475         struct xpt2046          *ts = xpt;
 476         static int average_val[2];
 477
 478
 479         xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
 480                 data_idx,ts->last_read,
 481           ts->read_cnt,ts->debounce_max,
 482                 abs(ts->last_read - *val),ts->debounce_tol,
 483                 ts->read_rep,ts->debounce_rep);
 484
 485         if(*val == 4095 || *val == 0)
 486         {
 487                 ts->read_cnt = 0;
 488                 ts->last_read = 0;
 489                 memset(average_val,0,sizeof(average_val));
 490                 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
 491                 return XPT2046_FILTER_IGNORE;
 492         }
 493         /* discard the first sample. */
 494         if(!ts->read_cnt)
 495         {
 496                 //udelay(100);
 497                 ts->read_cnt++;
 498                 return XPT2046_FILTER_REPEAT;
 499         }
 500
 501         if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
 502                 /* Start over collecting consistent readings. */
 503                 ts->read_rep = 1;
 504                 average_val[data_idx] = *val;
 505                 /* Repeat it, if this was the first read or the read
 506                  * wasn't consistent enough. */
 507                 if (ts->read_cnt < ts->debounce_max) {
 508                         ts->last_read = *val;
 509                         ts->read_cnt++;
 510                         return XPT2046_FILTER_REPEAT;
 511                 } else {
 512                         /* Maximum number of debouncing reached and still
 513                          * not enough number of consistent readings. Abort
 514                          * the whole sample, repeat it in the next sampling
 515                          * period.
 516                          */
 517                         ts->read_cnt = 0;
 518                         ts->last_read = 0;
 519                         memset(average_val,0,sizeof(average_val));
 520                         xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
 521                         return XPT2046_FILTER_IGNORE;
 522                 }
 523         }
 524         else {
 525                 average_val[data_idx] += *val;
 526
 527                 if (++ts->read_rep >= ts->debounce_rep) {
 528                         /* Got a good reading for this coordinate,
 529                          * go for the next one. */
 530                         ts->read_cnt = 0;
 531                         ts->read_rep = 0;
 532                         ts->last_read = 0;
 533                         *val = average_val[data_idx]/(ts->debounce_rep);
 534                         return XPT2046_FILTER_OK;
 535                 } else {
 536                         /* Read more values that are consistent. */
 537                         ts->read_cnt++;
 538
 539                         return XPT2046_FILTER_REPEAT;
 540                 }
 541         }
 542 }
 543
 544 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
 545 {
 546         return XPT2046_FILTER_OK;
 547 }
 548
 549 static void xpt2046_rx_val(void *xpt)
 550 {
 551         struct xpt2046 *ts = xpt;
 552         struct xpt2046_packet *packet = ts->packet;
 553         struct spi_message *m;
 554         struct spi_transfer *t;
 555         int val;
 556         int action;
 557         int status;
 558
 559         m = &ts->msg[ts->msg_idx];
 560         t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 561
 562         /* adjust:  on-wire is a must-ignore bit, a BE12 value, then padding;
 563          * built from two 8 bit values written msb-first.
 564          */
 565         val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
 566
 567         xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
 568
 569         action = ts->filter(ts->filter_data, ts->msg_idx, &val);
 570         switch (action) {
 571         case XPT2046_FILTER_REPEAT:
 572                 break;
 573         case XPT2046_FILTER_IGNORE:
 574                 packet->tc.ignore = 1;
 575                 /* Last message will contain xpt2046_rx() as the
 576                  * completion function.
 577                  */
 578                 m = ts->last_msg;
 579                 break;
 580         case XPT2046_FILTER_OK:
 581                 *(u16 *)t->rx_buf = val;
 582                 packet->tc.ignore = 0;
 583                 m = &ts->msg[++ts->msg_idx];
 584                 break;
 585         default:
 586                 BUG();
 587         }
 588         ts->wait_for_sync();
 589         status = spi_async(ts->spi, m);
 590         if (status)
 591                 dev_err(&ts->spi->dev, "spi_async --> %d\n",
 592                                 status);
 593 }
 594
 595 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
 596 {
 597         struct xpt2046  *ts = container_of(handle, struct xpt2046, timer);
 598         int             status = 0;
 599
 600         spin_lock(&ts->lock);
 601
 602         if (unlikely(!get_pendown_state(ts) ||
 603                      device_suspended(&ts->spi->dev))) {
 604                 if (ts->pendown) {
 605                         struct input_dev *input = ts->input;
 606                         input_report_key(input, BTN_TOUCH, 0);
 607                         input_sync(input);
 608
 609                         ts->pendown = 0;
 610
 611                         xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
 612                 }
 613
 614                 /* measurement cycle ended */
 615                 if (!device_suspended(&ts->spi->dev)) {
 616                         xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
 617                         ts->irq_disabled = 0;
 618                         enable_irq(ts->spi->irq);
 619                 }
 620                 ts->pending = 0;
 621         } else {
 622                 /* pen is still down, continue with the measurement */
 623                 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
 624                 ts->msg_idx = 0;
 625                 ts->wait_for_sync();
 626                 status = spi_async(ts->spi, &ts->msg[0]);
 627                 if (status)
 628                         dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
 629         }
 630
 631         spin_unlock(&ts->lock);
 632         return HRTIMER_NORESTART;
 633 }
 634
 635 static irqreturn_t xpt2046_irq(int irq, void *handle)
 636 {
 637         struct xpt2046 *ts = handle;
 638         unsigned long flags;
 639
 640         xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
 641
 642         spin_lock_irqsave(&ts->lock, flags);
 643
 644         if (likely(get_pendown_state(ts))) {
 645                 if (!ts->irq_disabled) {
 646                         /* The ARM do_simple_IRQ() dispatcher doesn't act
 647                          * like the other dispatchers:  it will report IRQs
 648                          * even after they've been disabled.  We work around
 649                          * that here.  (The "generic irq" framework may help...)
 650                          */
 651                         ts->irq_disabled = 1;
 652                         disable_irq_nosync(ts->spi->irq);
 653                         ts->pending = 1;
 654                         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
 655                                         HRTIMER_MODE_REL);
 656                 }
 657         }
 658         spin_unlock_irqrestore(&ts->lock, flags);
 659
 660         return IRQ_HANDLED;
 661 }
 662
 663 /*--------------------------------------------------------------------------*/
 664
 665 /* Must be called with ts->lock held */
 666 static void xpt2046_disable(struct xpt2046 *ts)
 667 {
 668         if (ts->disabled)
 669                 return;
 670
 671         ts->disabled = 1;
 672
 673         /* are we waiting for IRQ, or polling? */
 674         if (!ts->pending) {
 675                 ts->irq_disabled = 1;
 676                 disable_irq(ts->spi->irq);
 677         } else {
 678                 /* the timer will run at least once more, and
 679                  * leave everything in a clean state, IRQ disabled
 680                  */
 681                 while (ts->pending) {
 682                         spin_unlock_irq(&ts->lock);
 683                         msleep(1);
 684                         spin_lock_irq(&ts->lock);
 685                 }
 686         }
 687
 688         /* we know the chip's in lowpower mode since we always
 689          * leave it that way after every request
 690          */
 691 }
 692
 693 /* Must be called with ts->lock held */
 694 static void xpt2046_enable(struct xpt2046 *ts)
 695 {
 696         if (!ts->disabled)
 697                 return;
 698
 699         ts->disabled = 0;
 700         ts->irq_disabled = 0;
 701         enable_irq(ts->spi->irq);
 702 }
 703
 704 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
 705 {
 706         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 707
 708         spin_lock_irq(&ts->lock);
 709
 710         ts->is_suspended = 1;
 711         xpt2046_disable(ts);
 712
 713         spin_unlock_irq(&ts->lock);
 714
 715         return 0;
 716
 717 }
 718
 719 static int xpt2046_resume(struct spi_device *spi)
 720 {
 721         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 722
 723         spin_lock_irq(&ts->lock);
 724
 725         ts->is_suspended = 0;
 726         xpt2046_enable(ts);
 727
 728         spin_unlock_irq(&ts->lock);
 729
 730         return 0;
 731 }
 732
 733 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
 734 {
 735         struct xpt2046_platform_data *pdata = spi->dev.platform_data;
 736         int err;
 737
 738         /* REVISIT when the irq can be triggered active-low, or if for some
 739          * reason the touchscreen isn't hooked up, we don't need to access
 740          * the pendown state.
 741          */
 742         if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
 743                 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
 744                 return -EINVAL;
 745         }
 746
 747         if (pdata->get_pendown_state) {
 748                 ts->get_pendown_state = pdata->get_pendown_state;
 749                 return 0;
 750         }
 751
 752         if (pdata->io_init) {
 753         err = pdata->io_init();
 754         if (err)
 755             dev_err(&spi->dev, "xpt2046 io_init fail\n");
 756     }
 757
 758         err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
 759         if (err) {
 760                 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
 761                                 pdata->gpio_pendown);
 762                 return err;
 763         }
 764
 765         ts->gpio_pendown = pdata->gpio_pendown;
 766         return 0;
 767 }
 768
 769 static int __devinit xpt2046_probe(struct spi_device *spi)
 770 {
 771         struct xpt2046                  *ts;
 772         struct xpt2046_packet           *packet;
 773         struct input_dev                *input_dev;
 774         struct xpt2046_platform_data    *pdata = spi->dev.platform_data;
 775         struct spi_message              *m;
 776         struct spi_transfer             *x;
 777         int                             vref;
 778         int                             err;
 779
 780
 781
 782         if (!spi->irq) {
 783                 dev_dbg(&spi->dev, "no IRQ?\n");
 784                 return -ENODEV;
 785         }
 786         else{
 787                 spi->irq = gpio_to_irq(spi->irq);
 788                 dev_dbg(&spi->dev, "no IRQ?\n");
 789         }
 790
 791         if (!pdata) {
 792                 dev_err(&spi->dev, "empty platform_data\n");
 793                 return -EFAULT;
 794         }
 795
 796         /* don't exceed max specified sample rate */
 797         if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
 798                 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
 799                                 (spi->max_speed_hz/SAMPLE_BITS)/1000);
 800                 return -EINVAL;
 801         }
 802
 803         /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
 804          * that even if the hardware can do that, the SPI controller driver
 805          * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 806          */
 807         spi->bits_per_word = 8;
 808         spi->mode = SPI_MODE_0;
 809         err = spi_setup(spi);
 810         if (err < 0)
 811                 return err;
 812
 813         ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
 814         packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
 815         input_dev = input_allocate_device();
 816         if (!ts || !packet || !input_dev) {
 817                 err = -ENOMEM;
 818                 goto err_free_mem;
 819         }
 820
 821         dev_set_drvdata(&spi->dev, ts);
 822
 823         ts->packet = packet;
 824         ts->spi = spi;
 825         ts->input = input_dev;
 826         ts->swap_xy = pdata->swap_xy;
 827
 828         hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 829         ts->timer.function = xpt2046_timer;
 830
 831         spin_lock_init(&ts->lock);
 832
 833         ts->model = pdata->model ? : 2046;
 834
 835         if (pdata->filter != NULL) {
 836                 if (pdata->filter_init != NULL) {
 837                         err = pdata->filter_init(pdata, &ts->filter_data);
 838                         if (err < 0)
 839                                 goto err_free_mem;
 840                 }
 841                 ts->filter = pdata->filter;
 842                 ts->filter_cleanup = pdata->filter_cleanup;
 843         } else if (pdata->debounce_max) {
 844                 ts->debounce_max = pdata->debounce_max;
 845                 if (ts->debounce_max < pdata->debounce_rep)
 846                         ts->debounce_max = pdata->debounce_rep;
 847                 ts->debounce_tol = pdata->debounce_tol;
 848                 ts->debounce_rep = pdata->debounce_rep;
 849                 ts->filter = xpt2046_debounce;
 850                 ts->filter_data = ts;
 851         } else
 852                 ts->filter = xpt2046_no_filter;
 853
 854         err = setup_pendown(spi, ts);
 855         if (err)
 856                 goto err_cleanup_filter;
 857
 858         if (pdata->penirq_recheck_delay_usecs)
 859                 ts->penirq_recheck_delay_usecs =
 860                                 pdata->penirq_recheck_delay_usecs;
 861
 862         ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
 863
 864         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
 865         snprintf(ts->name, sizeof(ts->name), "XPT%d Touchscreen", ts->model);
 866
 867         input_dev->name = ts->name;
 868         input_dev->phys = ts->phys;
 869         input_dev->dev.parent = &spi->dev;
 870
 871         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 872         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 873         input_set_abs_params(input_dev, ABS_X,
 874                         pdata->x_min ? : 0,
 875                         pdata->x_max ? : MAX_12BIT,
 876                         0, 0);
 877         input_set_abs_params(input_dev, ABS_Y,
 878                         pdata->y_min ? : 0,
 879                         pdata->y_max ? : MAX_12BIT,
 880                         0, 0);
 881
 882         vref = pdata->keep_vref_on;
 883
 884         /* set up the transfers to read touchscreen state; this assumes we
 885          * use formula #2 for pressure, not #3.
 886          */
 887         m = &ts->msg[0];
 888         x = ts->xfer;
 889
 890         spi_message_init(m);
 891
 892         /* y- still on; turn on only y+ (and ADC) */
 893         packet->read_y = READ_Y(vref);
 894         x->tx_buf = &packet->read_y;
 895         x->len = 1;
 896         spi_message_add_tail(x, m);
 897
 898         x++;
 899         x->rx_buf = &packet->tc.y;
 900         x->len = 2;
 901         spi_message_add_tail(x, m);
 902
 903         m->complete = xpt2046_rx_val;
 904         m->context = ts;
 905
 906         m++;
 907         spi_message_init(m);
 908
 909         /* turn y- off, x+ on, then leave in lowpower */
 910         x++;
 911         packet->read_x = READ_X(vref);
 912         x->tx_buf = &packet->read_x;
 913         x->len = 1;
 914         spi_message_add_tail(x, m);
 915
 916         x++;
 917         x->rx_buf = &packet->tc.x;
 918         x->len = 2;
 919         spi_message_add_tail(x, m);
 920
 921         m->complete = xpt2046_rx_val;
 922         m->context = ts;
 923
 924         /* power down */
 925         m++;
 926         spi_message_init(m);
 927
 928         x++;
 929         packet->pwrdown = PWRDOWN;
 930         x->tx_buf = &packet->pwrdown;
 931         x->len = 1;
 932         spi_message_add_tail(x, m);
 933
 934         x++;
 935         x->rx_buf = &packet->dummy;
 936         x->len = 2;
 937         CS_CHANGE(*x);
 938         spi_message_add_tail(x, m);
 939
 940         m->complete = xpt2046_rx;
 941         m->context = ts;
 942
 943         ts->last_msg = m;
 944
 945         if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
 946                         spi->dev.driver->name, ts)) {
 947                 printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
 948                 err = request_irq(spi->irq, xpt2046_irq,
 949                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 950                                   spi->dev.driver->name, ts);
 951                 if (err) {
 952                         dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
 953                         goto err_free_gpio;
 954                 }
 955         }
 956         xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
 957
 958         /* take a first sample, leaving nPENIRQ active and vREF off; avoid
 959          * the touchscreen, in case it's not connected.
 960          */
 961         xpt2046_read12_dfr(&spi->dev,READ_X(1));
 962
 963         //err = sysfs_create_group(&spi->dev.kobj, &xpt2046_attr_group);
 964         if (err)
 965                 goto err_remove_hwmon;
 966
 967         err = input_register_device(input_dev);
 968         if (err)
 969                 goto err_remove_attr_group;
 970   printk("xpt2046_ts: driver initialized\n");
 971         return 0;
 972
 973  err_remove_attr_group:
 974         //sysfs_remove_group(&spi->dev.kobj, &xpt2046_attr_group);
 975  err_remove_hwmon:
 976         free_irq(spi->irq, ts);
 977  err_free_gpio:
 978         if (ts->gpio_pendown != -1)
 979                 gpio_free(ts->gpio_pendown);
 980  err_cleanup_filter:
 981         if (ts->filter_cleanup)
 982                 ts->filter_cleanup(ts->filter_data);
 983  err_free_mem:
 984         input_free_device(input_dev);
 985         kfree(packet);
 986         kfree(ts);
 987         return err;
 988 }
 989
 990 static int __devexit xpt2046_remove(struct spi_device *spi)
 991 {
 992         struct xpt2046          *ts = dev_get_drvdata(&spi->dev);
 993
 994         input_unregister_device(ts->input);
 995
 996         xpt2046_suspend(spi, PMSG_SUSPEND);
 997
 998         //sysfs_remove_group(&spi->dev.kobj, &xpt2046_attr_group);
 999
1000         free_irq(ts->spi->irq, ts);
1001         /* suspend left the IRQ disabled */
1002         enable_irq(ts->spi->irq);
1003
1004         if (ts->gpio_pendown != -1)
1005                 gpio_free(ts->gpio_pendown);
1006
1007         if (ts->filter_cleanup)
1008                 ts->filter_cleanup(ts->filter_data);
1009
1010         kfree(ts->packet);
1011         kfree(ts);
1012
1013         dev_dbg(&spi->dev, "unregistered touchscreen\n");
1014         return 0;
1015 }
1016
1017 static struct spi_driver xpt2046_driver = {
1018         .driver = {
1019                 .name   = "xpt2046_ts",
1020                 .bus    = &spi_bus_type,
1021                 .owner  = THIS_MODULE,
1022         },
1023         .probe          = xpt2046_probe,
1024         .remove         = __devexit_p(xpt2046_remove),
1025         .suspend        = xpt2046_suspend,
1026         .resume         = xpt2046_resume,
1027 };
1028
1029 static int __init xpt2046_init(void)
1030 {
1031         //return spi_register_driver(&xpt2046_driver);
1032         int ret = spi_register_driver(&xpt2046_driver);
1033
1034     if (ret == 0)
1035     {
1036             gADPoint.x = 0;
1037             gADPoint.y = 0;
1038             ret = driver_create_file(&xpt2046_driver.driver, &driver_attr_touchcheck);
1039             ret += driver_create_file(&xpt2046_driver.driver, &driver_attr_touchadc);
1040             ret += driver_create_file(&xpt2046_driver.driver, &driver_attr_calistatus);
1041         }
1042
1043         return ret;
1044 }
1045 module_init(xpt2046_init);
1046
1047 static void __exit xpt2046_exit(void)
1048 {
1049         //spi_unregister_driver(&xpt2046_driver);
1050         driver_remove_file(&xpt2046_driver.driver, &driver_attr_touchcheck);
1051     driver_remove_file(&xpt2046_driver.driver, &driver_attr_touchadc);
1052     driver_remove_file(&xpt2046_driver.driver, &driver_attr_calistatus);
1053
1054         spi_unregister_driver(&xpt2046_driver);
1055 }
1056 module_exit(xpt2046_exit);
1057
1058 MODULE_DESCRIPTION("rk2818 spi xpt2046 TouchScreen Driver");
1059 MODULE_LICENSE("GPL");
1060 MODULE_ALIAS("spi:xpt2046");