drivers/input/touchscreen/xpt2046_ts_320X480.c

   1 /*
   2  * drivers/input/touchscreen/xpt2046_ts.c - driver for rk2818 spi xpt2046 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_ts.h"
  28
  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 #define LCD_MAX_LENGTH                          596
  56 #define LCD_MAX_WIDTH                           320
  57 #define PT2046_TOUCH_AD_LEFT            256
  58 #define PT2046_TOUCH_AD_RIGHT           3870
  59 #define PT2046_TOUCH_AD_TOP             380
  60 #define PT2046_TOUCH_AD_BOTTOM  3658
  61 #define AD_TO_X(adx)    (LCD_MAX_WIDTH * (  adx - PT2046_TOUCH_AD_TOP ) / ( PT2046_TOUCH_AD_BOTTOM - PT2046_TOUCH_AD_TOP ))
  62 #define AD_TO_Y(ady)    (LCD_MAX_LENGTH * ( ady - PT2046_TOUCH_AD_LEFT ) / ( PT2046_TOUCH_AD_RIGHT - PT2046_TOUCH_AD_LEFT  ))
  63
  64 #define TS_POLL_DELAY   (10 * 1000000)  /* ns delay before the first sample */
  65 #define TS_POLL_PERIOD  (20 * 1000000)  /* ns delay between samples */
  66
  67 #define DEBOUNCE_REPTIME  3
  68 /* this driver doesn't aim at the peak continuous sample rate */
  69 #define SAMPLE_BITS     (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
  70
  71 struct ts_event {
  72         /* For portability, we can't read 12 bit values using SPI (which
  73          * would make the controller deliver them as native byteorder u16
  74          * with msbs zeroed).  Instead, we read them as two 8-bit values,
  75          * *** WHICH NEED BYTESWAPPING *** and range adjustment.
  76          */
  77         u16     x;
  78         u16     y;
  79         int     ignore;
  80 };
  81
  82 /*
  83  * We allocate this separately to avoid cache line sharing issues when
  84  * driver is used with DMA-based SPI controllers (like atmel_spi) on
  85  * systems where main memory is not DMA-coherent (most non-x86 boards).
  86  */
  87 struct xpt2046_packet {
  88         u8                      read_x, read_y, pwrdown;
  89         u16                     dummy;          /* for the pwrdown read */
  90         struct ts_event         tc;
  91 };
  92
  93 struct xpt2046 {
  94         struct input_dev        *input;
  95         char                    phys[32];
  96         char                    name[32];
  97
  98         struct spi_device       *spi;
  99
 100         u16                     model;
 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
 113         u16                     debounce_max;
 114         u16                     debounce_tol;
 115         u16                     debounce_rep;
 116
 117         u16                     penirq_recheck_delay_usecs;
 118
 119         spinlock_t              lock;
 120         struct hrtimer          timer;
 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 };
 136
 137 /* leave chip selected when we're done, for quicker re-select? */
 138 #if     0
 139 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
 140 #else
 141 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
 142 #endif
 143
 144 /*--------------------------------------------------------------------------*/
 145
 146 /* The xpt2046 has touchscreen and other sensors.
 147  * Earlier xpt2046 chips are somewhat compatible.
 148  */
 149 #define XPT2046_START                   (1 << 7)
 150 #define XPT2046_A2A1A0_d_y              (1 << 4)        /* differential */
 151 #define XPT2046_A2A1A0_d_z1             (3 << 4)        /* differential */
 152 #define XPT2046_A2A1A0_d_z2             (4 << 4)        /* differential */
 153 #define XPT2046_A2A1A0_d_x              (5 << 4)        /* differential */
 154 #define XPT2046_A2A1A0_temp0    (0 << 4)        /* non-differential */
 155 #define XPT2046_A2A1A0_vbatt    (2 << 4)        /* non-differential */
 156 #define XPT2046_A2A1A0_vaux             (6 << 4)        /* non-differential */
 157 #define XPT2046_A2A1A0_temp1    (7 << 4)        /* non-differential */
 158 #define XPT2046_8_BIT                   (1 << 3)
 159 #define XPT2046_12_BIT                  (0 << 3)
 160 #define XPT2046_SER                             (1 << 2)        /* non-differential */
 161 #define XPT2046_DFR                             (0 << 2)        /* differential */
 162 #define XPT2046_PD10_PDOWN              (0 << 0)        /* lowpower mode + penirq */
 163 #define XPT2046_PD10_ADC_ON             (1 << 0)        /* ADC on */
 164 #define XPT2046_PD10_REF_ON             (2 << 0)        /* vREF on + penirq */
 165 #define XPT2046_PD10_ALL_ON             (3 << 0)        /* ADC + vREF on */
 166
 167 #define MAX_12BIT       ((1<<12)-1)
 168
 169 /* leave ADC powered up (disables penirq) between differential samples */
 170 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
 171         | XPT2046_12_BIT | XPT2046_DFR | \
 172         (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
 173
 174 #define READ_Y(vref)    (READ_12BIT_DFR(y,  1, vref))
 175 #define READ_Z1(vref)   (READ_12BIT_DFR(z1, 1, vref))
 176 #define READ_Z2(vref)   (READ_12BIT_DFR(z2, 1, vref))
 177
 178 #define READ_X(vref)    (READ_12BIT_DFR(x,  1, vref))
 179 #define PWRDOWN         (READ_12BIT_DFR(y,  0, 0))      /* LAST */
 180
 181 /* single-ended samples need to first power up reference voltage;
 182  * we leave both ADC and VREF powered
 183  */
 184 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
 185         | XPT2046_12_BIT | XPT2046_SER)
 186
 187 #define REF_ON  (READ_12BIT_DFR(x, 1, 1))
 188 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
 189
 190 /*--------------------------------------------------------------------------*/
 191 /*
 192  * touchscreen sensors  use differential conversions.
 193  */
 194
 195 struct dfr_req {
 196         u8                      command;
 197         u8                      pwrdown;
 198         u16                     dummy;          /* for the pwrdown read */
 199         __be16                  sample;
 200         struct spi_message      msg;
 201         struct spi_transfer     xfer[4];
 202 };
 203
 204 static struct xpt2046_platform_data xpt2046_info = {
 205         .model                  = 2046,
 206         .keep_vref_on   = 1,
 207         .swap_xy                = 0,
 208         .x_min                  = 0,
 209         .x_max                  = 320,
 210         .y_min                  = 0,
 211         .y_max                  = 480,
 212         .debounce_max           = 7,
 213         .debounce_rep           = DEBOUNCE_REPTIME,
 214         .debounce_tol           = 20,
 215         .gpio_pendown           = RK2818_PIN_PE1,//RK2818_PIN_PE3, //modify by zhao
 216         .penirq_recheck_delay_usecs = 1,
 217
 218 };
 219
 220 //add by zhao
 221 #define LEN_TO_PIX(x)   (unsigned int)( 320 * (x) / 47 )
 222 #define KEY1_X                  6.3
 223 #define KEY2_X                  17.8
 224 #define KEY3_X                  29.3
 225 #define KEY4_X                  40.8
 226 #define KEY_RADIUS              4
 227
 228 #define KEY_TOP                 511
 229 #define KEY_BOTTOM              567
 230
 231 #define KEY1_LEFT               LEN_TO_PIX(KEY1_X - KEY_RADIUS)
 232 #define KEY1_RIGHT              LEN_TO_PIX(KEY1_X + KEY_RADIUS)
 233 #define KEY2_LEFT               LEN_TO_PIX(KEY2_X - KEY_RADIUS)
 234 #define KEY2_RIGHT              LEN_TO_PIX(KEY2_X + KEY_RADIUS)
 235 #define KEY3_LEFT               LEN_TO_PIX(KEY3_X - KEY_RADIUS)
 236 #define KEY3_RIGHT              LEN_TO_PIX(KEY3_X + KEY_RADIUS)
 237 #define KEY4_LEFT               LEN_TO_PIX(KEY4_X - KEY_RADIUS)
 238 #define KEY4_RIGHT              LEN_TO_PIX(KEY4_X + KEY_RADIUS)
 239
 240  struct KeyInfo
 241 {
 242         unsigned int left;
 243         unsigned int right;
 244         int key;
 245         int status;
 246
 247 };
 248
 249 static struct KeyInfo panel_key_info[]={
 250 {KEY1_LEFT, KEY1_RIGHT, KEY_HOME, 0},
 251 {KEY2_LEFT, KEY2_RIGHT, KEY_MENU, 0},
 252 {KEY3_LEFT, KEY3_RIGHT, KEY_BACK, 0},
 253 {KEY4_LEFT, KEY4_RIGHT, KEY_FIND, 0},
 254 };
 255 //end by zhao
 256
 257 static void xpt2046_enable(struct xpt2046 *ts);
 258 static void xpt2046_disable(struct xpt2046 *ts);
 259
 260 static int device_suspended(struct device *dev)
 261 {
 262         struct xpt2046 *ts = dev_get_drvdata(dev);
 263         return ts->is_suspended || ts->disabled;
 264 }
 265
 266 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
 267 {
 268         struct spi_device       *spi = to_spi_device(dev);
 269         struct xpt2046          *ts = dev_get_drvdata(dev);
 270         struct dfr_req          *req = kzalloc(sizeof *req, GFP_KERNEL);
 271         int                     status;
 272
 273         if (!req)
 274                 return -ENOMEM;
 275
 276         spi_message_init(&req->msg);
 277
 278         /* take sample */
 279         req->command = (u8) command;
 280         req->xfer[0].tx_buf = &req->command;
 281         req->xfer[0].len = 1;
 282         spi_message_add_tail(&req->xfer[0], &req->msg);
 283
 284         req->xfer[1].rx_buf = &req->sample;
 285         req->xfer[1].len = 2;
 286         //xpt2046printk("-------------1 sample 0x%x,command=%x--------------------\n",req->sample,(u8)command); //add by zhao
 287         spi_message_add_tail(&req->xfer[1], &req->msg);
 288
 289         /* converter in low power mode & enable PENIRQ */
 290         req->pwrdown= PWRDOWN;
 291         req->xfer[2].tx_buf = &req->pwrdown;
 292         req->xfer[2].len = 1;
 293         spi_message_add_tail(&req->xfer[2], &req->msg);
 294
 295         req->xfer[3].rx_buf = &req->dummy;
 296         req->xfer[3].len = 2;
 297         CS_CHANGE(req->xfer[3]);
 298         spi_message_add_tail(&req->xfer[3], &req->msg);
 299
 300         ts->irq_disabled = 1;
 301         disable_irq(spi->irq);
 302         status = spi_sync(spi, &req->msg);
 303         ts->irq_disabled = 0;
 304         enable_irq(spi->irq);
 305         //xpt2046printk("-------------2 sample 0x%x-----------------\n",req->sample);   //add by zhao
 306         if (status == 0) {
 307                 /* on-wire is a must-ignore bit, a BE12 value, then padding */
 308                 status = be16_to_cpu(req->sample);
 309                 status = status >> 3;
 310                 status &= 0x0fff;
 311                 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
 312         }
 313
 314         kfree(req);
 315         return status;
 316 }
 317
 318
 319
 320 /*--------------------------------------------------------------------------*/
 321
 322 static int get_pendown_state(struct xpt2046 *ts)
 323 {
 324         if (ts->get_pendown_state)
 325                 return ts->get_pendown_state();
 326
 327         return !gpio_get_value(ts->gpio_pendown);
 328 }
 329
 330 static void null_wait_for_sync(void)
 331 {
 332
 333 }
 334
 335 /*
 336  * PENIRQ only kicks the timer.  The timer only reissues the SPI transfer,
 337  * to retrieve touchscreen status.
 338  *
 339  * The SPI transfer completion callback does the real work.  It reports
 340  * touchscreen events and reactivates the timer (or IRQ) as appropriate.
 341  */
 342
 343 static void xpt2046_rx(void *xpt)
 344 {
 345         struct xpt2046          *ts = xpt;
 346         struct xpt2046_packet   *packet = ts->packet;
 347         unsigned                Rt = 1;
 348         u16                     x, y;
 349         u8                      i;
 350         /* xpt2046_rx_val() did in-place conversion (including byteswap) from
 351          * on-the-wire format as part of debouncing to get stable readings.
 352          */
 353         x = packet->tc.x;
 354         y = packet->tc.y;
 355
 356         xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
 357
 358         /* range filtering */
 359         if (x == MAX_12BIT)
 360                 x = 0;
 361
 362         /* Sample found inconsistent by debouncing or pressure is beyond
 363          * the maximum. Don't report it to user space, repeat at least
 364          * once more the measurement
 365          */
 366         if (packet->tc.ignore) {
 367
 368                 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
 369
 370                 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 371                               HRTIMER_MODE_REL);
 372                 return;
 373         }
 374
 375         /* Maybe check the pendown state before reporting. This discards
 376          * false readings when the pen is lifted.
 377          */
 378         if (ts->penirq_recheck_delay_usecs) {
 379                 udelay(ts->penirq_recheck_delay_usecs);
 380                 if (!get_pendown_state(ts))
 381                 {
 382                         xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
 383                         Rt = 0;
 384                 }
 385         }
 386
 387         /* NOTE: We can't rely on the pressure to determine the pen down
 388          * state, even this controller has a pressure sensor.  The pressure
 389          * value can fluctuate for quite a while after lifting the pen and
 390          * in some cases may not even settle at the expected value.
 391          *
 392          * The only safe way to check for the pen up condition is in the
 393          * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 394          */
 395         if (Rt) {
 396                 struct input_dev *input = ts->input;
 397 /*              if (!ts->pendown) {
 398                         input_report_key(input, BTN_TOUCH, 1);
 399                         ts->pendown = 1;
 400                         xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 401                 }
 402 */
 403                 x =  AD_TO_X(x);
 404                 y =  AD_TO_Y(y);
 405
 406                 if (ts->swap_xy)
 407                         swap(x, y);
 408
 409                 //add by zhao
 410                 if ((y > KEY_TOP) && (y < KEY_BOTTOM))
 411                 {
 412                         for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 413                         {
 414                                 if ((x > panel_key_info[i].left) && (x < panel_key_info[i].right))
 415                                 {
 416                                         panel_key_info[i].status = 1;
 417                                         input_report_key(input, panel_key_info[i].key,1);
 418                                         input_sync(input);
 419                                         xpt2046printk("***>%s:input_report_key(%2d)(%4d , %4d)\n",__FUNCTION__,panel_key_info[i].key, x, y);
 420                                 }
 421                         }
 422
 423                 }
 424                 else if (y <= xpt2046_info.y_max)
 425                 {
 426                         if (!ts->pendown) {
 427                                 input_report_key(input, BTN_TOUCH, 1);
 428                                 ts->pendown = 1;
 429                                 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 430                         }
 431                         input_report_abs(input, ABS_X, x);
 432                         input_report_abs(input, ABS_Y, y);
 433                         input_sync(input);
 434                         xpt2046printk("***>%s:input_report_abs(%4d , %4d)\n",__FUNCTION__,x, y);
 435                 }
 436
 437         }
 438
 439         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 440                         HRTIMER_MODE_REL);
 441 }
 442
 443 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
 444 {
 445         struct xpt2046          *ts = xpt;
 446         static int average_val[2];
 447
 448
 449 /*      xpt2046printk("***>%s:data_idx=%d,last_read=%d,read_cnt=%d,debounce_max=%d,last_read=%d,debounce_tol=%d,read_rep=%d,debounce_rep=%d\n",__FUNCTION__,
 450                 data_idx,ts->last_read,
 451           ts->read_cnt,ts->debounce_max,
 452                 abs(ts->last_read - *val),ts->debounce_tol,
 453                 ts->read_rep,ts->debounce_rep);
 454 */
 455         if(*val == 4095 || *val == 0)
 456         {
 457                 ts->read_cnt = 0;
 458                 ts->last_read = 0;
 459                 memset(average_val,0,sizeof(average_val));
 460                 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
 461                 return XPT2046_FILTER_IGNORE;
 462         }
 463         /* discard the first sample. */
 464         if(!ts->read_cnt)
 465         {
 466                 ts->read_cnt++;
 467                 return XPT2046_FILTER_REPEAT;
 468         }
 469
 470         if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
 471                 /* Start over collecting consistent readings. */
 472                 ts->read_rep = 1;
 473                 average_val[data_idx] = *val;
 474                 /* Repeat it, if this was the first read or the read
 475                  * wasn't consistent enough. */
 476                 if (ts->read_cnt < ts->debounce_max) {
 477                         ts->last_read = *val;
 478                         ts->read_cnt++;
 479                         return XPT2046_FILTER_REPEAT;
 480                 } else {
 481                         /* Maximum number of debouncing reached and still
 482                          * not enough number of consistent readings. Abort
 483                          * the whole sample, repeat it in the next sampling
 484                          * period.
 485                          */
 486                         ts->read_cnt = 0;
 487                         ts->last_read = 0;
 488                         memset(average_val,0,sizeof(average_val));
 489                         xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
 490                         return XPT2046_FILTER_IGNORE;
 491                 }
 492         }
 493         else {
 494                 average_val[data_idx] += *val;
 495
 496                 if (++ts->read_rep >= ts->debounce_rep) {
 497                         /* Got a good reading for this coordinate,
 498                          * go for the next one. */
 499                         ts->read_cnt = 0;
 500                         ts->read_rep = 0;
 501                         ts->last_read = 0;
 502                         *val = average_val[data_idx]/(ts->debounce_rep);
 503                         return XPT2046_FILTER_OK;
 504                 } else {
 505                         /* Read more values that are consistent. */
 506                         ts->read_cnt++;
 507
 508                         return XPT2046_FILTER_REPEAT;
 509                 }
 510         }
 511 }
 512
 513 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
 514 {
 515         return XPT2046_FILTER_OK;
 516 }
 517
 518 static void xpt2046_rx_val(void *xpt)
 519 {
 520         struct xpt2046 *ts = xpt;
 521         struct xpt2046_packet *packet = ts->packet;
 522         struct spi_message *m;
 523         struct spi_transfer *t;
 524         int val;
 525         int action;
 526         int status;
 527
 528         m = &ts->msg[ts->msg_idx];
 529         t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 530
 531         /* adjust:  on-wire is a must-ignore bit, a BE12 value, then padding;
 532          * built from two 8 bit values written msb-first.
 533          */
 534         val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
 535
 536 //      xpt2046printk("***>%s:value=%d, x=%d, y=%d, rx_buf=%d\n",__FUNCTION__,val,packet->tc.x,packet->tc.y,*(u16 *)t->rx_buf);
 537
 538         action = ts->filter(ts->filter_data, ts->msg_idx, &val);
 539         switch (action) {
 540         case XPT2046_FILTER_REPEAT:
 541                 break;
 542         case XPT2046_FILTER_IGNORE:
 543                 packet->tc.ignore = 1;
 544                 /* Last message will contain xpt2046_rx() as the
 545                  * completion function.
 546                  */
 547                 m = ts->last_msg;
 548                 break;
 549         case XPT2046_FILTER_OK:
 550                 *(u16 *)t->rx_buf = val;
 551                 packet->tc.ignore = 0;
 552                 m = &ts->msg[++ts->msg_idx];
 553                 break;
 554         default:
 555                 BUG();
 556         }
 557         ts->wait_for_sync();
 558         status = spi_async(ts->spi, m);
 559         if (status)
 560                 dev_err(&ts->spi->dev, "spi_async --> %d\n",
 561                                 status);
 562 }
 563
 564 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
 565 {
 566         struct xpt2046  *ts = container_of(handle, struct xpt2046, timer);
 567         int             status = 0;
 568         int             i;
 569
 570         spin_lock(&ts->lock);
 571
 572         if (unlikely(!get_pendown_state(ts) ||
 573                      device_suspended(&ts->spi->dev))) {
 574                                         //add by zhao
 575                 struct input_dev *input = ts->input;
 576                 for(i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 577                 {
 578                         if (panel_key_info[i].status)
 579                         {
 580                                 input_report_key(input, panel_key_info[i].key, 0);
 581                                 panel_key_info[i].status = 0;
 582                                 input_sync(input);
 583                                 xpt2046printk("***>%s:input_report_key(KEY up)\n",__FUNCTION__);
 584                         }
 585                 }
 586
 587                 if (ts->pendown) {
 588                         input_report_key(input, BTN_TOUCH, 0);
 589                         input_sync(input);
 590                         ts->pendown = 0;
 591
 592                         xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
 593                 }
 594
 595                 /* measurement cycle ended */
 596                 if (!device_suspended(&ts->spi->dev)) {
 597                         xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
 598                         ts->irq_disabled = 0;
 599                         enable_irq(ts->spi->irq);
 600                 }
 601                 ts->pending = 0;
 602         } else {
 603                 /* pen is still down, continue with the measurement */
 604                 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
 605                 ts->msg_idx = 0;
 606                 ts->wait_for_sync();
 607                 status = spi_async(ts->spi, &ts->msg[0]);
 608                 if (status)
 609                         dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
 610         }
 611
 612         spin_unlock(&ts->lock);
 613         return HRTIMER_NORESTART;
 614 }
 615
 616 static irqreturn_t xpt2046_irq(int irq, void *handle)
 617 {
 618         struct xpt2046 *ts = handle;
 619         unsigned long flags;
 620         xpt2046printk("\n-----------xpt2046_irq------------------\n");
 621         xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
 622
 623         spin_lock_irqsave(&ts->lock, flags);
 624
 625         if (likely(get_pendown_state(ts))) {
 626                 if (!ts->irq_disabled) {
 627                         /* The ARM do_simple_IRQ() dispatcher doesn't act
 628                          * like the other dispatchers:  it will report IRQs
 629                          * even after they've been disabled.  We work around
 630                          * that here.  (The "generic irq" framework may help...)
 631                          */
 632                         ts->irq_disabled = 1;
 633                         disable_irq_nosync(ts->spi->irq);
 634                         ts->pending = 1;
 635                         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
 636                                         HRTIMER_MODE_REL);
 637                 }
 638         }
 639         spin_unlock_irqrestore(&ts->lock, flags);
 640
 641         return IRQ_HANDLED;
 642 }
 643
 644 /*--------------------------------------------------------------------------*/
 645
 646 /* Must be called with ts->lock held */
 647 static void xpt2046_disable(struct xpt2046 *ts)
 648 {
 649         if (ts->disabled)
 650                 return;
 651
 652         ts->disabled = 1;
 653
 654         /* are we waiting for IRQ, or polling? */
 655         if (!ts->pending) {
 656                 ts->irq_disabled = 1;
 657                 disable_irq(ts->spi->irq);
 658         } else {
 659                 /* the timer will run at least once more, and
 660                  * leave everything in a clean state, IRQ disabled
 661                  */
 662                 while (ts->pending) {
 663                         spin_unlock_irq(&ts->lock);
 664                         msleep(1);
 665                         spin_lock_irq(&ts->lock);
 666                 }
 667         }
 668
 669         /* we know the chip's in lowpower mode since we always
 670          * leave it that way after every request
 671          */
 672 }
 673
 674 /* Must be called with ts->lock held */
 675 static void xpt2046_enable(struct xpt2046 *ts)
 676 {
 677         if (!ts->disabled)
 678                 return;
 679
 680         ts->disabled = 0;
 681         ts->irq_disabled = 0;
 682         enable_irq(ts->spi->irq);
 683 }
 684
 685 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
 686 {
 687         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 688
 689         spin_lock_irq(&ts->lock);
 690
 691         ts->is_suspended = 1;
 692         xpt2046_disable(ts);
 693
 694         spin_unlock_irq(&ts->lock);
 695
 696         return 0;
 697
 698 }
 699
 700 static int xpt2046_resume(struct spi_device *spi)
 701 {
 702         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 703
 704         spin_lock_irq(&ts->lock);
 705
 706         ts->is_suspended = 0;
 707         xpt2046_enable(ts);
 708
 709         spin_unlock_irq(&ts->lock);
 710
 711         return 0;
 712 }
 713
 714 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
 715 {
 716         struct xpt2046_platform_data *pdata = spi->dev.platform_data;
 717         int err;
 718
 719         /* REVISIT when the irq can be triggered active-low, or if for some
 720          * reason the touchscreen isn't hooked up, we don't need to access
 721          * the pendown state.
 722          */
 723         if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
 724                 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
 725                 return -EINVAL;
 726         }
 727
 728         if (pdata->get_pendown_state) {
 729                 ts->get_pendown_state = pdata->get_pendown_state;
 730                 return 0;
 731         }
 732
 733     if (pdata->io_init) {
 734         err = pdata->io_init();
 735         if (err)
 736             dev_err(&spi->dev, "xpt2046 io_init fail\n");
 737     }
 738
 739         err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
 740         if (err) {
 741                 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
 742                                 pdata->gpio_pendown);
 743                 return err;
 744         }
 745
 746         ts->gpio_pendown = pdata->gpio_pendown;
 747         return 0;
 748 }
 749
 750
 751 static int __devinit xpt2046_probe(struct spi_device *spi)
 752 {
 753         struct xpt2046                  *ts;
 754         struct xpt2046_packet           *packet;
 755         struct input_dev                *input_dev;
 756         struct xpt2046_platform_data    *pdata = spi->dev.platform_data;
 757         struct spi_message              *m;
 758         struct spi_transfer             *x;
 759         int                             vref;
 760         int                             err;
 761         int                             i;
 762
 763         if (!spi->irq) {
 764                 dev_dbg(&spi->dev, "no IRQ?\n");
 765                 return -ENODEV;
 766         }
 767         else{
 768                 spi->irq = gpio_to_irq(spi->irq);
 769                 dev_dbg(&spi->dev, "no IRQ?\n");
 770         }
 771
 772         /*
 773         if (!pdata) {
 774                 xpt2046printk("-----------------pdata is null -------------------------\n");
 775                 spi->dev.platform_data = &xpt2046_info;
 776                 pdata = spi->dev.platform_data;
 777         }
 778         */
 779
 780     if (!pdata) {
 781         dev_err(&spi->dev, "empty platform_data\n");
 782         return -EFAULT;
 783     }
 784
 785         /* don't exceed max specified sample rate */
 786         if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
 787                 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
 788                                 (spi->max_speed_hz/SAMPLE_BITS)/1000);
 789                 return -EINVAL;
 790         }
 791
 792         /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
 793          * that even if the hardware can do that, the SPI controller driver
 794          * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 795          */
 796         spi->bits_per_word = 8;
 797         spi->mode = SPI_MODE_0;
 798         err = spi_setup(spi);
 799         if (err < 0)
 800                 return err;
 801
 802         ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
 803         packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
 804         input_dev = input_allocate_device();
 805         if (!ts || !packet || !input_dev) {
 806                 err = -ENOMEM;
 807                 goto err_free_mem;
 808         }
 809
 810         dev_set_drvdata(&spi->dev, ts);
 811
 812         ts->packet = packet;
 813         ts->spi = spi;
 814         ts->input = input_dev;
 815         ts->swap_xy = pdata->swap_xy;
 816
 817         hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 818         ts->timer.function = xpt2046_timer;
 819
 820         spin_lock_init(&ts->lock);
 821
 822         ts->model = pdata->model ? : 2046;
 823
 824         if (pdata->filter != NULL) {
 825                 if (pdata->filter_init != NULL) {
 826                         err = pdata->filter_init(pdata, &ts->filter_data);
 827                         if (err < 0)
 828                                 goto err_free_mem;
 829                 }
 830                 ts->filter = pdata->filter;
 831                 ts->filter_cleanup = pdata->filter_cleanup;
 832         } else if (pdata->debounce_max) {
 833                 ts->debounce_max = pdata->debounce_max;
 834                 if (ts->debounce_max < pdata->debounce_rep)
 835                         ts->debounce_max = pdata->debounce_rep;
 836                 ts->debounce_tol = pdata->debounce_tol;
 837                 ts->debounce_rep = pdata->debounce_rep;
 838                 ts->filter = xpt2046_debounce;
 839                 ts->filter_data = ts;
 840         } else
 841                 ts->filter = xpt2046_no_filter;
 842
 843         err = setup_pendown(spi, ts);
 844         if (err)
 845                 goto err_cleanup_filter;
 846
 847         if (pdata->penirq_recheck_delay_usecs)
 848                 ts->penirq_recheck_delay_usecs =
 849                                 pdata->penirq_recheck_delay_usecs;
 850
 851         ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
 852
 853         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
 854         snprintf(ts->name, sizeof(ts->name), "XPT%d Touchscreen", ts->model);
 855
 856         input_dev->name = ts->name;
 857         input_dev->phys = ts->phys;
 858         input_dev->dev.parent = &spi->dev;
 859
 860         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 861         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 862         //add by zhao
 863         for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 864                 set_bit(panel_key_info[i].key, input_dev->keybit);
 865         clear_bit(0, input_dev->keybit);
 866         //end
 867         input_set_abs_params(input_dev, ABS_X,
 868                         pdata->x_min ? : 0,
 869                         pdata->x_max ? : MAX_12BIT,
 870                         0, 0);
 871         input_set_abs_params(input_dev, ABS_Y,
 872                         pdata->y_min ? : 0,
 873                         pdata->y_max ? : MAX_12BIT,
 874                         0, 0);
 875
 876         vref = pdata->keep_vref_on;
 877
 878         /* set up the transfers to read touchscreen state; this assumes we
 879          * use formula #2 for pressure, not #3.
 880          */
 881         m = &ts->msg[0];
 882         x = ts->xfer;
 883
 884         spi_message_init(m);
 885
 886         /* y- still on; turn on only y+ (and ADC) */
 887         packet->read_y = READ_Y(vref);
 888         xpt2046printk("-------------read Y 0x%x\n",packet->read_y);     //add by zhao
 889         x->tx_buf = &packet->read_y;
 890         x->len = 1;
 891         spi_message_add_tail(x, m);
 892
 893         x++;
 894         x->rx_buf = &packet->tc.y;
 895         x->len = 2;
 896         spi_message_add_tail(x, m);
 897
 898         m->complete = xpt2046_rx_val;
 899         m->context = ts;
 900
 901         m++;
 902         spi_message_init(m);
 903
 904         /* turn y- off, x+ on, then leave in lowpower */
 905         x++;
 906         packet->read_x = READ_X(vref);
 907         xpt2046printk("-------------read X 0x%x\n",packet->read_x);     //add by zhao
 908         x->tx_buf = &packet->read_x;
 909         x->len = 1;
 910         spi_message_add_tail(x, m);
 911
 912         x++;
 913         x->rx_buf = &packet->tc.x;
 914         x->len = 2;
 915         spi_message_add_tail(x, m);
 916
 917         m->complete = xpt2046_rx_val;
 918         m->context = ts;
 919
 920         /* power down */
 921         m++;
 922         spi_message_init(m);
 923
 924         x++;
 925         packet->pwrdown = PWRDOWN;
 926         x->tx_buf = &packet->pwrdown;
 927         x->len = 1;
 928         spi_message_add_tail(x, m);
 929
 930         x++;
 931         x->rx_buf = &packet->dummy;
 932         x->len = 2;
 933         CS_CHANGE(*x);
 934         spi_message_add_tail(x, m);
 935
 936         m->complete = xpt2046_rx;
 937         m->context = ts;
 938
 939         ts->last_msg = m;
 940         xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
 941         if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
 942                         spi->dev.driver->name, ts)) {
 943                 printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
 944                 err = request_irq(spi->irq, xpt2046_irq,
 945                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 946                                   spi->dev.driver->name, ts);
 947                 if (err) {
 948                         dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
 949                         goto err_free_gpio;
 950                 }
 951         }
 952
 953         /* take a first sample, leaving nPENIRQ active and vREF off; avoid
 954          * the touchscreen, in case it's not connected.
 955          */
 956         xpt2046_read12_dfr(&spi->dev,READ_X(1));
 957
 958         err = input_register_device(input_dev);
 959         if (err)
 960                 goto err_remove_attr_group;
 961   printk("xpt2046_ts: driver initialized\n");
 962         return 0;
 963
 964  err_remove_attr_group:
 965         free_irq(spi->irq, ts);
 966  err_free_gpio:
 967         if (ts->gpio_pendown != -1)
 968                 gpio_free(ts->gpio_pendown);
 969  err_cleanup_filter:
 970         if (ts->filter_cleanup)
 971                 ts->filter_cleanup(ts->filter_data);
 972  err_free_mem:
 973         input_free_device(input_dev);
 974         kfree(packet);
 975         kfree(ts);
 976         return err;
 977 }
 978
 979 static int __devexit xpt2046_remove(struct spi_device *spi)
 980 {
 981         struct xpt2046          *ts = dev_get_drvdata(&spi->dev);
 982
 983         input_unregister_device(ts->input);
 984
 985         xpt2046_suspend(spi, PMSG_SUSPEND);
 986
 987         free_irq(ts->spi->irq, ts);
 988         /* suspend left the IRQ disabled */
 989         enable_irq(ts->spi->irq);
 990
 991         if (ts->gpio_pendown != -1)
 992                 gpio_free(ts->gpio_pendown);
 993
 994         if (ts->filter_cleanup)
 995                 ts->filter_cleanup(ts->filter_data);
 996
 997         kfree(ts->packet);
 998         kfree(ts);
 999
1000         dev_dbg(&spi->dev, "unregistered touchscreen\n");
1001         return 0;
1002 }
1003
1004 static struct spi_driver xpt2046_driver = {
1005         .driver = {
1006                 .name   = "xpt2046_ts",
1007                 .bus    = &spi_bus_type,
1008                 .owner  = THIS_MODULE,
1009         },
1010         .probe          = xpt2046_probe,
1011         .remove         = __devexit_p(xpt2046_remove),
1012         .suspend        = xpt2046_suspend,
1013         .resume         = xpt2046_resume,
1014 };
1015
1016 static int __init xpt2046_init(void)
1017 {
1018         return spi_register_driver(&xpt2046_driver);
1019 }
1020 module_init(xpt2046_init);
1021
1022 static void __exit xpt2046_exit(void)
1023 {
1024         spi_unregister_driver(&xpt2046_driver);
1025 }
1026 module_exit(xpt2046_exit);
1027
1028 MODULE_DESCRIPTION("rk2818 spi xpt2046 TouchScreen Driver");
1029 MODULE_LICENSE("GPL");
1030 MODULE_ALIAS("spi:xpt2046");