drivers/input/touchscreen/xpt2046_tslib_ts.c

   1 /*
   2  * drivers/input/touchscreen/xpt2046_ts.c - driver for rk29 spi xpt2046 device and console
   3  *
   4  * Copyright (C) 2011 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 #include <mach/iomux.h>
  27 #ifdef CONFIG_HAS_EARLYSUSPEND
  28 #include <linux/earlysuspend.h>
  29 #endif
  30 #include "xpt2046_tslib_ts.h"
  31 #include "ts_lib/tslib.h"
  32 /*
  33  * This code has been heavily tested on a Nokia 770, and lightly
  34  * tested on other xpt2046 devices (OSK/Mistral, Lubbock).
  35  * TSC2046 is just newer xpt2046 silicon.
  36  * Support for ads7843 tested on Atmel at91sam926x-EK.
  37  * Support for ads7845 has only been stubbed in.
  38  *
  39  * IRQ handling needs a workaround because of a shortcoming in handling
  40  * edge triggered IRQs on some platforms like the OMAP1/2. These
  41  * platforms don't handle the ARM lazy IRQ disabling properly, thus we
  42  * have to maintain our own SW IRQ disabled status. This should be
  43  * removed as soon as the affected platform's IRQ handling is fixed.
  44  *
  45  * app note sbaa036 talks in more detail about accurate sampling...
  46  * that ought to help in situations like LCDs inducing noise (which
  47  * can also be helped by using synch signals) and more generally.
  48  * This driver tries to utilize the measures described in the app
  49  * note. The strength of filtering can be set in the board-* specific
  50  * files.
  51  */
  52 #define XPT2046_DEBUG                   0
  53 #if XPT2046_DEBUG
  54         #define xpt2046printk(msg...)   printk(msg);
  55 #else
  56         #define xpt2046printk(msg...)
  57 #endif
  58
  59 #define TS_POLL_DELAY   (10)    /* ns delay before the first sample */
  60 #define TS_POLL_PERIOD  (20)    /* ns delay between samples */
  61
  62 /* this driver doesn't aim at the peak continuous sample rate */
  63 #define SAMPLE_BITS     (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
  64
  65 struct ts_event {
  66         /* For portability, we can't read 12 bit values using SPI (which
  67          * would make the controller deliver them as native byteorder u16
  68          * with msbs zeroed).  Instead, we read them as two 8-bit values,
  69          * *** WHICH NEED BYTESWAPPING *** and range adjustment.
  70          */
  71         u16     x;
  72         u16     y;
  73         int     ignore;
  74 };
  75
  76 /*
  77  * We allocate this separately to avoid cache line sharing issues when
  78  * driver is used with DMA-based SPI controllers (like atmel_spi) on
  79  * systems where main memory is not DMA-coherent (most non-x86 boards).
  80  */
  81 struct xpt2046_packet {
  82         u8                      read_x, read_y, pwrdown;
  83         u16                     dummy;          /* for the pwrdown read */
  84         struct ts_event         tc;
  85 };
  86
  87 struct xpt2046 {
  88         struct input_dev        *input;
  89         char    phys[32];
  90         char    name[32];
  91         char    pendown_iomux_name[IOMUX_NAME_SIZE];
  92         struct spi_device       *spi;
  93
  94         u16             model;
  95         u16             x_min, x_max;
  96         u16             y_min, y_max;
  97         u16             debounce_max;
  98         u16             debounce_tol;
  99         u16             debounce_rep;
 100         u16             penirq_recheck_delay_usecs;
 101         bool    swap_xy;
 102
 103         struct xpt2046_packet   *packet;
 104
 105         struct spi_transfer     xfer[18];
 106         struct spi_message      msg[5];
 107         struct spi_message      *last_msg;
 108         int             msg_idx;
 109         int             read_cnt;
 110         int             read_rep;
 111         int             last_read;
 112         int             pendown_iomux_mode;
 113         int     touch_ad_top;
 114         int     touch_ad_bottom;
 115         int     touch_ad_left;
 116         int     touch_ad_right;
 117         int     touch_virtualkey_length;
 118         spinlock_t              lock;
 119         struct delayed_work      d_work;
 120         struct tslib_info tslib_info;
 121         unsigned                pendown:1;      /* P: lock */
 122         unsigned                pending:1;      /* P: lock */
 123 // FIXME remove "irq_disabled"
 124         unsigned                irq_disabled:1; /* P: lock */
 125         unsigned                disabled:1;
 126         unsigned                is_suspended:1;
 127
 128         int                     (*filter)(void *data, int data_idx, int *val);
 129         void            *filter_data;
 130         void            (*filter_cleanup)(void *data);
 131         int                     (*get_pendown_state)(void);
 132         int                     gpio_pendown;
 133
 134         void            (*wait_for_sync)(void);
 135 #ifdef CONFIG_HAS_EARLYSUSPEND
 136         struct early_suspend early_suspend;
 137 #endif
 138 };
 139
 140 /* leave chip selected when we're done, for quicker re-select? */
 141 #if     0
 142 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
 143 #else
 144 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
 145 #endif
 146
 147 /*--------------------------------------------------------------------------*/
 148
 149 /* The xpt2046 has touchscreen and other sensors.
 150  * Earlier xpt2046 chips are somewhat compatible.
 151  */
 152 #define XPT2046_START                   (1 << 7)
 153 #define XPT2046_A2A1A0_d_y              (1 << 4)        /* differential */
 154 #define XPT2046_A2A1A0_d_z1             (3 << 4)        /* differential */
 155 #define XPT2046_A2A1A0_d_z2             (4 << 4)        /* differential */
 156 #define XPT2046_A2A1A0_d_x              (5 << 4)        /* differential */
 157 #define XPT2046_A2A1A0_temp0    (0 << 4)        /* non-differential */
 158 #define XPT2046_A2A1A0_vbatt    (2 << 4)        /* non-differential */
 159 #define XPT2046_A2A1A0_vaux             (6 << 4)        /* non-differential */
 160 #define XPT2046_A2A1A0_temp1    (7 << 4)        /* non-differential */
 161 #define XPT2046_8_BIT                   (1 << 3)
 162 #define XPT2046_12_BIT                  (0 << 3)
 163 #define XPT2046_SER                             (1 << 2)        /* non-differential */
 164 #define XPT2046_DFR                             (0 << 2)        /* differential */
 165 #define XPT2046_PD10_PDOWN              (0 << 0)        /* lowpower mode + penirq */
 166 #define XPT2046_PD10_ADC_ON             (1 << 0)        /* ADC on */
 167 #define XPT2046_PD10_REF_ON             (2 << 0)        /* vREF on + penirq */
 168 #define XPT2046_PD10_ALL_ON             (3 << 0)        /* ADC + vREF on */
 169
 170 #define MAX_12BIT       ((1<<12)-1)
 171
 172 /* leave ADC powered up (disables penirq) between differential samples */
 173 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
 174         | XPT2046_12_BIT | XPT2046_DFR | \
 175         (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
 176
 177 #define READ_Y(vref)    (READ_12BIT_DFR(y,  1, vref))
 178 #define READ_Z1(vref)   (READ_12BIT_DFR(z1, 1, vref))
 179 #define READ_Z2(vref)   (READ_12BIT_DFR(z2, 1, vref))
 180
 181 #define READ_X(vref)    (READ_12BIT_DFR(x,  1, vref))
 182 #define PWRDOWN         (READ_12BIT_DFR(y,  0, 0))      /* LAST */
 183
 184 /* single-ended samples need to first power up reference voltage;
 185  * we leave both ADC and VREF powered
 186  */
 187 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
 188         | XPT2046_12_BIT | XPT2046_SER)
 189
 190 #define REF_ON  (READ_12BIT_DFR(x, 1, 1))
 191 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
 192
 193 /*--------------------------------------------------------------------------*/
 194 /*
 195  * touchscreen sensors  use differential conversions.
 196  */
 197
 198 struct dfr_req {
 199         u8                      command;
 200         u8                      pwrdown;
 201         u16                     dummy;          /* for the pwrdown read */
 202         __be16                  sample;
 203         struct spi_message      msg;
 204         struct spi_transfer     xfer[4];
 205 };
 206 static DECLARE_WAIT_QUEUE_HEAD(wq_ts);
 207 static int wq_condition_ts = 1;
 208
 209 static void xpt2046_enable(struct xpt2046 *ts);
 210 static void xpt2046_disable(struct xpt2046 *ts);
 211 static int xpt2046_verifyAndConvert(struct xpt2046 *ts,int adx, int ady,int *x, int *y)
 212 {
 213         *x = ts->x_max * (ts->touch_ad_left - adx)/(ts->touch_ad_left - ts->touch_ad_right);
 214     *y = ts->y_max * (ts->touch_ad_top - ady)/(ts->touch_ad_top - ts->touch_ad_bottom);
 215
 216         xpt2046printk("%s:(%d/%d)\n",__FUNCTION__,*x, *y);
 217
 218         if((*x< ts->x_min) || (*x > ts->x_max))
 219                 return 1;
 220
 221         if((*y< ts->y_min) || (*y > ts->y_max + ts->touch_virtualkey_length))
 222                 return 1;
 223
 224
 225         return 0;
 226 }
 227 static int device_suspended(struct device *dev)
 228 {
 229         struct xpt2046 *ts = dev_get_drvdata(dev);
 230         return ts->is_suspended || ts->disabled;
 231 }
 232
 233 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
 234 {
 235         struct spi_device       *spi = to_spi_device(dev);
 236         struct xpt2046          *ts = dev_get_drvdata(dev);
 237         struct dfr_req          *req = kzalloc(sizeof *req, GFP_KERNEL);
 238         int                     status;
 239
 240         if (!req)
 241                 return -ENOMEM;
 242
 243         spi_message_init(&req->msg);
 244
 245         /* take sample */
 246         req->command = (u8) command;
 247         req->xfer[0].tx_buf = &req->command;
 248         req->xfer[0].len = 1;
 249         spi_message_add_tail(&req->xfer[0], &req->msg);
 250
 251         req->xfer[1].rx_buf = &req->sample;
 252         req->xfer[1].len = 2;
 253         spi_message_add_tail(&req->xfer[1], &req->msg);
 254
 255         /* converter in low power mode & enable PENIRQ */
 256         req->pwrdown= PWRDOWN;
 257         req->xfer[2].tx_buf = &req->pwrdown;
 258         req->xfer[2].len = 1;
 259         spi_message_add_tail(&req->xfer[2], &req->msg);
 260
 261         req->xfer[3].rx_buf = &req->dummy;
 262         req->xfer[3].len = 2;
 263         CS_CHANGE(req->xfer[3]);
 264         spi_message_add_tail(&req->xfer[3], &req->msg);
 265
 266         ts->irq_disabled = 1;
 267         disable_irq(spi->irq);
 268         status = spi_sync(spi, &req->msg);
 269         ts->irq_disabled = 0;
 270         enable_irq(spi->irq);
 271
 272         if (status == 0) {
 273                 /* on-wire is a must-ignore bit, a BE12 value, then padding */
 274                 status = be16_to_cpu(req->sample);
 275                 status = status >> 3;
 276                 status &= 0x0fff;
 277                 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
 278         }
 279
 280         kfree(req);
 281         return status;
 282 }
 283
 284
 285
 286 /*--------------------------------------------------------------------------*/
 287
 288 static int get_pendown_state(struct xpt2046 *ts)
 289 {
 290         if (ts->get_pendown_state)
 291                 return ts->get_pendown_state();
 292
 293         return !gpio_get_value(ts->gpio_pendown);
 294 }
 295
 296 static void null_wait_for_sync(void)
 297 {
 298
 299 }
 300
 301 /*
 302  * PENIRQ only kicks the timer.  The timer only reissues the SPI transfer,
 303  * to retrieve touchscreen status.
 304  *
 305  * The SPI transfer completion callback does the real work.  It reports
 306  * touchscreen events and reactivates the timer (or IRQ) as appropriate.
 307  */
 308 static void xpt2046_rx(void *xpt)
 309 {
 310         /* xpt2046_rx_val() did in-place conversion (including byteswap) from
 311          * on-the-wire format as part of debouncing to get stable readings.
 312          */
 313         wq_condition_ts= 1;
 314         wake_up(&wq_ts);
 315
 316     return;
 317 }
 318
 319 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
 320 {
 321         struct xpt2046          *ts = xpt;
 322         static int average_val[2];
 323
 324
 325         xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
 326                 data_idx,ts->last_read,
 327           ts->read_cnt,ts->debounce_max,
 328                 abs(ts->last_read - *val),ts->debounce_tol,
 329                 ts->read_rep,ts->debounce_rep);
 330
 331         /* discard the first sample. */
 332          //on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
 333         if(!ts->read_cnt)
 334         {
 335                 //udelay(100);
 336                 ts->read_cnt++;
 337                 return XPT2046_FILTER_REPEAT;
 338         }
 339         if(*val == 4095 || *val == 0)
 340         {
 341                 ts->read_cnt = 0;
 342                 ts->last_read = 0;
 343                 memset(average_val,0,sizeof(average_val));
 344                 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
 345                 return XPT2046_FILTER_IGNORE;
 346         }
 347         /* discard the first sample. */
 348 /*      if(!ts->read_cnt)
 349         {
 350                 ts->read_cnt++;
 351                 return XPT2046_FILTER_REPEAT;
 352         }
 353 move discard ahead  */
 354
 355         if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
 356                 /* Start over collecting consistent readings. */
 357                 ts->read_rep = 1;
 358                 average_val[data_idx] = *val;
 359                 /* Repeat it, if this was the first read or the read
 360                  * wasn't consistent enough. */
 361                 if (ts->read_cnt < ts->debounce_max) {
 362                         ts->last_read = *val;
 363                         ts->read_cnt++;
 364                         return XPT2046_FILTER_REPEAT;
 365                 } else {
 366                         /* Maximum number of debouncing reached and still
 367                          * not enough number of consistent readings. Abort
 368                          * the whole sample, repeat it in the next sampling
 369                          * period.
 370                          */
 371                         ts->read_cnt = 0;
 372                         ts->last_read = 0;
 373                         memset(average_val,0,sizeof(average_val));
 374                         xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
 375                         return XPT2046_FILTER_IGNORE;
 376                 }
 377         }
 378         else {
 379                 average_val[data_idx] += *val;
 380
 381                 if (++ts->read_rep >= ts->debounce_rep) {
 382                         /* Got a good reading for this coordinate,
 383                          * go for the next one. */
 384                         ts->read_cnt = 0;
 385                         ts->read_rep = 0;
 386                         ts->last_read = 0;
 387                         *val = average_val[data_idx]/(ts->debounce_rep);
 388                         return XPT2046_FILTER_OK;
 389                 } else {
 390                         /* Read more values that are consistent. */
 391                         ts->read_cnt++;
 392
 393                         return XPT2046_FILTER_REPEAT;
 394                 }
 395         }
 396 }
 397
 398 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
 399 {
 400         return XPT2046_FILTER_OK;
 401 }
 402
 403 static void xpt2046_rx_val(void *xpt)
 404 {
 405         struct xpt2046 *ts = xpt;
 406         struct xpt2046_packet *packet = ts->packet;
 407         struct spi_message *m;
 408         struct spi_transfer *t;
 409         int val;
 410         int action;
 411         int status;
 412
 413         m = &ts->msg[ts->msg_idx];
 414         t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 415
 416         /* adjust:  on-wire is a must-ignore bit, a BE12 value, then padding;
 417          * built from two 8 bit values written msb-first.
 418          */
 419         val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
 420
 421         xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
 422
 423         action = ts->filter(ts->filter_data, ts->msg_idx, &val);
 424         switch (action) {
 425         case XPT2046_FILTER_REPEAT:
 426                 break;
 427         case XPT2046_FILTER_IGNORE:
 428                 packet->tc.ignore = 1;
 429                 /* Last message will contain xpt2046_rx() as the
 430                  * completion function.
 431                  */
 432                 m = ts->last_msg;
 433                 break;
 434         case XPT2046_FILTER_OK:
 435                 *(u16 *)t->rx_buf = val;
 436                 packet->tc.ignore = 0;
 437                 m = &ts->msg[++ts->msg_idx];
 438                 break;
 439         default:
 440                 BUG();
 441         }
 442         ts->wait_for_sync();
 443         status = spi_async(ts->spi, m);
 444         if (status)
 445                 dev_err(&ts->spi->dev, "spi_async --> %d\n",
 446                                 status);
 447 }
 448
 449 int xpt2046_get_raw_data(struct tslib_info *info, struct ts_sample *samp, int nr)
 450 {
 451
 452                 struct xpt2046 *ts = container_of((void *)info, struct xpt2046, tslib_info);
 453                 struct xpt2046_packet   *packet = ts->packet;
 454                 int             status = 0;
 455                 memset(samp, 0, sizeof(struct ts_sample)*nr);
 456
 457                 wq_condition_ts = 0;
 458
 459                 ts->msg_idx = 0;
 460                 ts->wait_for_sync();
 461                 status = spi_async(ts->spi, &ts->msg[0]);
 462                 if (status)
 463                         dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
 464
 465                 xpt2046printk("xpt2046_get_raw_data:wait_event \n");
 466                 if(!wait_event_timeout(wq_ts, wq_condition_ts, msecs_to_jiffies(100)))
 467                 {
 468                         samp->x = 4095;
 469                         samp->y = 4095;
 470                         samp->pressure = 0;
 471                         return 1;
 472                 }
 473
 474                 samp->x = packet->tc.x;
 475                 samp->y = packet->tc.y;
 476                 samp->pressure = !(packet->tc.ignore);
 477                 //xpt2046printk("xpt2046_get_raw_data:samp->x=%d,samp->y=%d,samp->pressure=%d \n",
 478                         //samp->x,samp->y,samp->pressure);
 479                 return 1;
 480 }
 481
 482 static void xpt2046_report(struct xpt2046       *ts)
 483 {
 484         struct ts_sample samp[3];
 485         struct xpt2046_packet   *packet = ts->packet;
 486         int ret,Rt=1;
 487         int x = 0,y =0,z = 0;
 488
 489         ret = dejitter_read(&ts->tslib_info, samp, 1);
 490
 491         xpt2046printk("***>%s:ret=%d,samp[0].x=%d,samp[0].y=%d,samp[0].pressure=%d\n",
 492                 __FUNCTION__,ret,samp[0].x,samp[0].y,samp[0].pressure);
 493         if(ret == 1){
 494                 x = samp[0].x;
 495                 y = samp[0].y;
 496                 z = samp[0].pressure;
 497         }
 498         else if(ret == 2){
 499                 x = (samp[0].x + samp[1].x) / 2;
 500                 y = (samp[0].y + samp[1].y) / 2;
 501                 z = (samp[0].pressure + samp[1].pressure) / 2;
 502         }
 503         else if(ret ==3){
 504                 x = (samp[0].x + samp[1].x + samp[2].x)/3;
 505                 y = (samp[0].y + samp[1].y + samp[2].y)/3;
 506                 z = (samp[0].pressure + samp[1].pressure + samp[2].pressure)/3;
 507         }
 508         else{
 509                 printk("no sampe\n");
 510                 goto out;
 511         }
 512
 513         if(z == 0)
 514         {
 515                 xpt2046printk("***>%s:z == 0\n",__FUNCTION__);
 516                 goto out;
 517         }
 518
 519         /* range filtering */
 520         if (x == MAX_12BIT)
 521                 x = 0;
 522
 523         /* Sample found inconsistent by debouncing or pressure is beyond
 524          * the maximum. Don't report it to user space, repeat at least
 525          * once more the measurement
 526          */
 527         if (packet->tc.ignore) {
 528                 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
 529                 schedule_delayed_work(&ts->d_work, msecs_to_jiffies(TS_POLL_PERIOD));
 530                 return;
 531         }
 532
 533         /* Maybe check the pendown state before reporting. This discards
 534          * false readings when the pen is lifted.
 535          */
 536         if (ts->penirq_recheck_delay_usecs) {
 537                 udelay(ts->penirq_recheck_delay_usecs);
 538                 if (!get_pendown_state(ts))
 539                 {
 540                         xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
 541                         Rt = 0;
 542                 }
 543         }
 544
 545         /* NOTE: We can't rely on the pressure to determine the pen down
 546          * state, even this controller has a pressure sensor.  The pressure
 547          * value can fluctuate for quite a while after lifting the pen and
 548          * in some cases may not even settle at the expected value.
 549          *
 550          * The only safe way to check for the pen up condition is in the
 551          * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 552          */
 553         if (Rt) {
 554                 struct input_dev *input = ts->input;
 555
 556                 if (ts->swap_xy)
 557                         swap(x, y);
 558                 if(xpt2046_verifyAndConvert(ts,x,y,&x,&y))
 559                 {
 560                         xpt2046printk("***>%s:xpt2046_verifyAndConvert fail\n",__FUNCTION__);
 561                         goto out;
 562                 }
 563
 564                 if (!ts->pendown) {
 565                         input_report_key(input, BTN_TOUCH, 1);
 566                         ts->pendown = 1;
 567                         xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 568                 }
 569
 570                 input_report_abs(input, ABS_X, x);
 571                 input_report_abs(input, ABS_Y, y);
 572
 573                 input_sync(input);
 574                 xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,x, y);
 575         }
 576
 577 out:
 578         schedule_delayed_work(&ts->d_work, msecs_to_jiffies(TS_POLL_PERIOD));
 579
 580         return;
 581 }
 582
 583 static void xpt2046_dwork_handler(struct work_struct *work)
 584 {
 585         struct xpt2046  *ts = (struct xpt2046 *)container_of(work, struct xpt2046, d_work.work);
 586
 587         spin_lock(&ts->lock);
 588
 589         if (unlikely(!get_pendown_state(ts) ||
 590                      device_suspended(&ts->spi->dev))) {
 591                 if (ts->pendown) {
 592                         struct input_dev *input = ts->input;
 593                         variance_clear(&ts->tslib_info);
 594                         input_report_key(input, BTN_TOUCH, 0);
 595                         input_sync(input);
 596
 597                         ts->pendown = 0;
 598
 599                         xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
 600                 }
 601
 602                 /* measurement cycle ended */
 603                 if (!device_suspended(&ts->spi->dev)) {
 604                         xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
 605                         ts->irq_disabled = 0;
 606                         enable_irq(ts->spi->irq);
 607                 }
 608                 ts->pending = 0;
 609         } else {
 610                 /* pen is still down, continue with the measurement */
 611                 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
 612                 spin_unlock(&ts->lock);
 613                 xpt2046_report(ts);
 614                 return;
 615         }
 616
 617         spin_unlock(&ts->lock);
 618         return;
 619 }
 620 static irqreturn_t xpt2046_irq(int irq, void *handle)
 621 {
 622         struct xpt2046 *ts = handle;
 623         unsigned long flags;
 624
 625         xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
 626
 627         spin_lock_irqsave(&ts->lock, flags);
 628
 629         if (likely(get_pendown_state(ts))) {
 630                 if (!ts->irq_disabled) {
 631                         /* The ARM do_simple_IRQ() dispatcher doesn't act
 632                          * like the other dispatchers:  it will report IRQs
 633                          * even after they've been disabled.  We work around
 634                          * that here.  (The "generic irq" framework may help...)
 635                          */
 636                         ts->irq_disabled = 1;
 637                         disable_irq_nosync(ts->spi->irq);
 638                         ts->pending = 1;
 639                         schedule_delayed_work(&ts->d_work, msecs_to_jiffies(TS_POLL_DELAY));
 640                 }
 641         }
 642         spin_unlock_irqrestore(&ts->lock, flags);
 643
 644         return IRQ_HANDLED;
 645 }
 646
 647 /*--------------------------------------------------------------------------*/
 648
 649 /* Must be called with ts->lock held */
 650 static void xpt2046_disable(struct xpt2046 *ts)
 651 {
 652         if (ts->disabled)
 653                 return;
 654
 655         ts->disabled = 1;
 656
 657         /* are we waiting for IRQ, or polling? */
 658         if (!ts->pending) {
 659                 ts->irq_disabled = 1;
 660                 disable_irq(ts->spi->irq);
 661         } else {
 662                 /* the timer will run at least once more, and
 663                  * leave everything in a clean state, IRQ disabled
 664                  */
 665                 while (ts->pending) {
 666                         spin_unlock_irq(&ts->lock);
 667                         msleep(1);
 668                         spin_lock_irq(&ts->lock);
 669                 }
 670         }
 671
 672         /* we know the chip's in lowpower mode since we always
 673          * leave it that way after every request
 674          */
 675 }
 676
 677 /* Must be called with ts->lock held */
 678 static void xpt2046_enable(struct xpt2046 *ts)
 679 {
 680         if (!ts->disabled)
 681                 return;
 682
 683         ts->disabled = 0;
 684         ts->irq_disabled = 0;
 685         enable_irq(ts->spi->irq);
 686 }
 687
 688 static int xpt2046_pSuspend(struct xpt2046 *ts)
 689 {
 690         spin_lock_irq(&ts->lock);
 691
 692         ts->is_suspended = 1;
 693         xpt2046_disable(ts);
 694
 695         spin_unlock_irq(&ts->lock);
 696
 697         return 0;
 698 }
 699
 700 static int xpt2046_pResume(struct xpt2046 *ts)
 701 {
 702         spin_lock_irq(&ts->lock);
 703
 704         ts->is_suspended = 0;
 705         xpt2046_enable(ts);
 706
 707         spin_unlock_irq(&ts->lock);
 708
 709         return 0;
 710 }
 711
 712 #if !defined(CONFIG_HAS_EARLYSUSPEND)
 713 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
 714 {
 715         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 716
 717         printk("xpt2046_suspend\n");
 718
 719         xpt2046_pSuspend(ts);
 720
 721         return 0;
 722 }
 723
 724 static int xpt2046_resume(struct spi_device *spi)
 725 {
 726         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 727
 728         printk("xpt2046_resume\n");
 729
 730         xpt2046_pResume(ts);
 731
 732         return 0;
 733 }
 734
 735 #elif defined(CONFIG_HAS_EARLYSUSPEND)
 736 static void xpt2046_early_suspend(struct early_suspend *h)
 737 {
 738         struct xpt2046  *ts;
 739     ts = container_of(h, struct xpt2046, early_suspend);
 740
 741         printk("xpt2046_suspend early\n");
 742
 743         xpt2046_pSuspend(ts);
 744
 745         return;
 746 }
 747
 748 static void xpt2046_late_resume(struct early_suspend *h)
 749 {
 750         struct xpt2046  *ts;
 751     ts = container_of(h, struct xpt2046, early_suspend);
 752
 753         printk("xpt2046_resume late\n");
 754
 755         xpt2046_pResume(ts);
 756
 757         return;
 758 }
 759 #endif
 760
 761 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
 762 {
 763         struct xpt2046_platform_data *pdata = spi->dev.platform_data;
 764         int err;
 765
 766         /* REVISIT when the irq can be triggered active-low, or if for some
 767          * reason the touchscreen isn't hooked up, we don't need to access
 768          * the pendown state.
 769          */
 770         if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
 771                 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
 772                 return -EINVAL;
 773         }
 774
 775         if (pdata->get_pendown_state) {
 776                 ts->get_pendown_state = pdata->get_pendown_state;
 777                 return 0;
 778         }
 779
 780     if (pdata->io_init) {
 781         err = pdata->io_init();
 782         if (err)
 783             dev_err(&spi->dev, "xpt2046 io_init fail\n");
 784     }
 785
 786         ts->gpio_pendown = pdata->gpio_pendown;
 787         strcpy(ts->pendown_iomux_name,pdata->pendown_iomux_name);
 788         ts->pendown_iomux_mode = pdata->pendown_iomux_mode;
 789
 790     rk29_mux_api_set(ts->pendown_iomux_name,pdata->pendown_iomux_mode);
 791         err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
 792         if (err) {
 793                 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
 794                                 pdata->gpio_pendown);
 795                 return err;
 796         }
 797
 798         err = gpio_pull_updown(pdata->gpio_pendown, GPIOPullUp);
 799         if (err) {
 800                 dev_err(&spi->dev, "failed to pullup pendown GPIO%d\n",
 801                                 pdata->gpio_pendown);
 802                 return err;
 803         }
 804         ts->gpio_pendown = pdata->gpio_pendown;
 805         return 0;
 806 }
 807
 808 static int __devinit xpt2046_probe(struct spi_device *spi)
 809 {
 810         struct xpt2046                  *ts;
 811         struct xpt2046_packet           *packet;
 812         struct input_dev                *input_dev;
 813         struct xpt2046_platform_data    *pdata = spi->dev.platform_data;
 814         struct spi_message              *m;
 815         struct spi_transfer             *x;
 816         int                             vref;
 817         int                             err;
 818
 819         if (!spi->irq) {
 820                 dev_dbg(&spi->dev, "no IRQ?\n");
 821                 return -ENODEV;
 822         }
 823         else{
 824                 spi->irq = gpio_to_irq(spi->irq);
 825                 dev_dbg(&spi->dev, "no IRQ?\n");
 826         }
 827
 828     if (!pdata) {
 829                 dev_err(&spi->dev, "empty platform_data\n");
 830                 return -EFAULT;
 831     }
 832
 833         /* don't exceed max specified sample rate */
 834         if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
 835                 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
 836                                 (spi->max_speed_hz/SAMPLE_BITS)/1000);
 837                 return -EINVAL;
 838         }
 839
 840         /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
 841          * that even if the hardware can do that, the SPI controller driver
 842          * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 843          */
 844         spi->bits_per_word = 8;
 845         spi->mode = SPI_MODE_0;
 846         err = spi_setup(spi);
 847         if (err < 0)
 848                 return err;
 849
 850         ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
 851         packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
 852         input_dev = input_allocate_device();
 853         if (!ts || !packet || !input_dev) {
 854                 err = -ENOMEM;
 855                 goto err_free_mem;
 856         }
 857
 858         dev_set_drvdata(&spi->dev, ts);
 859
 860         ts->packet = packet;
 861         ts->spi = spi;
 862         ts->input = input_dev;
 863         ts->swap_xy = pdata->swap_xy;
 864
 865         INIT_DELAYED_WORK(&ts->d_work, xpt2046_dwork_handler);
 866
 867         tslib_init(&ts->tslib_info, xpt2046_get_raw_data);
 868
 869         spin_lock_init(&ts->lock);
 870
 871         ts->model = pdata->model ? : 2046;
 872
 873         if (pdata->filter != NULL) {
 874                 if (pdata->filter_init != NULL) {
 875                         err = pdata->filter_init(pdata, &ts->filter_data);
 876                         if (err < 0)
 877                                 goto err_free_mem;
 878                 }
 879                 ts->filter = pdata->filter;
 880                 ts->filter_cleanup = pdata->filter_cleanup;
 881         } else if (pdata->debounce_max) {
 882                 ts->debounce_max = pdata->debounce_max;
 883                 if (ts->debounce_max < pdata->debounce_rep)
 884                         ts->debounce_max = pdata->debounce_rep;
 885                 ts->debounce_tol = pdata->debounce_tol;
 886                 ts->debounce_rep = pdata->debounce_rep;
 887                 ts->filter = xpt2046_debounce;
 888                 ts->filter_data = ts;
 889         } else
 890                 ts->filter = xpt2046_no_filter;
 891
 892         err = setup_pendown(spi, ts);
 893         if (err)
 894                 goto err_cleanup_filter;
 895
 896         if (pdata->penirq_recheck_delay_usecs)
 897                 ts->penirq_recheck_delay_usecs =
 898                                 pdata->penirq_recheck_delay_usecs;
 899
 900         ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
 901         ts->x_min = pdata->x_min;
 902         ts->x_max = pdata->x_max;
 903         ts->y_min = pdata->y_min;
 904         ts->y_max = pdata->y_max;
 905
 906         ts->touch_ad_top = pdata->touch_ad_top;
 907         ts->touch_ad_bottom= pdata->touch_ad_bottom;
 908         ts->touch_ad_left= pdata->touch_ad_left;
 909         ts->touch_ad_right= pdata->touch_ad_right;
 910
 911         ts->touch_virtualkey_length = pdata->touch_virtualkey_length;
 912
 913         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
 914         snprintf(ts->name, sizeof(ts->name), "xpt%d-touchscreen", ts->model);
 915
 916         input_dev->name = ts->name;
 917         input_dev->phys = ts->phys;
 918         input_dev->dev.parent = &spi->dev;
 919
 920         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 921         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 922         input_set_abs_params(input_dev, ABS_X,
 923                         ts->x_min ? : 0,
 924                         ts->x_max ? : MAX_12BIT,
 925                         0, 0);
 926         input_set_abs_params(input_dev, ABS_Y,
 927                         ts->y_min ? : 0,
 928                         ts->y_max ? : MAX_12BIT,
 929                         0, 0);
 930
 931         vref = pdata->keep_vref_on;
 932
 933         /* set up the transfers to read touchscreen state; this assumes we
 934          * use formula #2 for pressure, not #3.
 935          */
 936         m = &ts->msg[0];
 937         x = ts->xfer;
 938
 939         spi_message_init(m);
 940
 941         /* y- still on; turn on only y+ (and ADC) */
 942         packet->read_y = READ_Y(vref);
 943         x->tx_buf = &packet->read_y;
 944         x->len = 1;
 945         spi_message_add_tail(x, m);
 946
 947         x++;
 948         x->rx_buf = &packet->tc.y;
 949         x->len = 2;
 950         spi_message_add_tail(x, m);
 951
 952         m->complete = xpt2046_rx_val;
 953         m->context = ts;
 954
 955         m++;
 956         spi_message_init(m);
 957
 958         /* turn y- off, x+ on, then leave in lowpower */
 959         x++;
 960         packet->read_x = READ_X(vref);
 961         x->tx_buf = &packet->read_x;
 962         x->len = 1;
 963         spi_message_add_tail(x, m);
 964
 965         x++;
 966         x->rx_buf = &packet->tc.x;
 967         x->len = 2;
 968         spi_message_add_tail(x, m);
 969
 970         m->complete = xpt2046_rx_val;
 971         m->context = ts;
 972
 973         /* power down */
 974         m++;
 975         spi_message_init(m);
 976
 977         x++;
 978         packet->pwrdown = PWRDOWN;
 979         x->tx_buf = &packet->pwrdown;
 980         x->len = 1;
 981         spi_message_add_tail(x, m);
 982
 983         x++;
 984         x->rx_buf = &packet->dummy;
 985         x->len = 2;
 986         CS_CHANGE(*x);
 987         spi_message_add_tail(x, m);
 988
 989         m->complete = xpt2046_rx;
 990         m->context = ts;
 991
 992         ts->last_msg = m;
 993
 994         if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
 995                         spi->dev.driver->name, ts)) {
 996                 xpt2046printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
 997                 err = request_irq(spi->irq, xpt2046_irq,
 998                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 999                                   spi->dev.driver->name, ts);
1000                 if (err) {
1001                         dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
1002                         goto err_free_gpio;
1003                 }
1004         }
1005         xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
1006
1007         /* take a first sample, leaving nPENIRQ active and vREF off; avoid
1008          * the touchscreen, in case it's not connected.
1009          */
1010         xpt2046_read12_dfr(&spi->dev,READ_X(1));
1011
1012         err = input_register_device(input_dev);
1013         if (err)
1014                 goto err_remove_attr_group;
1015
1016 #ifdef CONFIG_HAS_EARLYSUSPEND
1017         ts->early_suspend.suspend = xpt2046_early_suspend;
1018         ts->early_suspend.resume = xpt2046_late_resume;
1019         ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
1020         register_early_suspend(&ts->early_suspend);
1021 #endif
1022
1023     xpt2046printk("xpt2046_ts: driver initialized\n");
1024         return 0;
1025
1026  err_remove_attr_group:
1027         free_irq(spi->irq, ts);
1028  err_free_gpio:
1029         if (ts->gpio_pendown != -1)
1030                 gpio_free(ts->gpio_pendown);
1031  err_cleanup_filter:
1032         if (ts->filter_cleanup)
1033                 ts->filter_cleanup(ts->filter_data);
1034  err_free_mem:
1035         input_free_device(input_dev);
1036         kfree(packet);
1037         kfree(ts);
1038         return err;
1039 }
1040
1041 static int __devexit xpt2046_remove(struct spi_device *spi)
1042 {
1043         struct xpt2046          *ts = dev_get_drvdata(&spi->dev);
1044
1045         input_unregister_device(ts->input);
1046
1047 #if !defined(CONFIG_HAS_EARLYSUSPEND)
1048         xpt2046_suspend(spi, PMSG_SUSPEND);
1049 #elif defined(CONFIG_HAS_EARLYSUSPEND)
1050         xpt2046_early_suspend(&ts->early_suspend);
1051         unregister_early_suspend(&ts->early_suspend);
1052 #endif
1053
1054         free_irq(ts->spi->irq, ts);
1055         /* suspend left the IRQ disabled */
1056         enable_irq(ts->spi->irq);
1057
1058         if (ts->gpio_pendown != -1)
1059                 gpio_free(ts->gpio_pendown);
1060
1061         if (ts->filter_cleanup)
1062                 ts->filter_cleanup(ts->filter_data);
1063
1064         kfree(ts->packet);
1065         kfree(ts);
1066
1067         dev_dbg(&spi->dev, "unregistered touchscreen\n");
1068         return 0;
1069 }
1070
1071 static struct spi_driver xpt2046_driver = {
1072         .driver = {
1073                 .name   = "xpt2046_ts",
1074                 .bus    = &spi_bus_type,
1075                 .owner  = THIS_MODULE,
1076         },
1077         .probe          = xpt2046_probe,
1078         .remove         = __devexit_p(xpt2046_remove),
1079 #ifndef CONFIG_HAS_EARLYSUSPEND
1080         .suspend        = xpt2046_suspend,
1081         .resume         = xpt2046_resume,
1082 #endif
1083 };
1084
1085 static int __init xpt2046_init(void)
1086 {
1087         return spi_register_driver(&xpt2046_driver);
1088 }
1089 module_init(xpt2046_init);
1090
1091 static void __exit xpt2046_exit(void)
1092 {
1093         spi_unregister_driver(&xpt2046_driver);
1094 }
1095 module_exit(xpt2046_exit);
1096
1097 MODULE_DESCRIPTION("rk29xx spi xpt2046 TouchScreen Driver");
1098 MODULE_LICENSE("GPL");
1099 MODULE_ALIAS("spi:xpt2046");