drivers/input/touchscreen/xpt2046_ts_320X480.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
  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 //add by zhao
 205 #define LEN_TO_PIX(x)   (unsigned int)( 320 * (x) / 47 )
 206 #define KEY1_X                  6.3
 207 #define KEY2_X                  17.8
 208 #define KEY3_X                  29.3
 209 #define KEY4_X                  40.8
 210 #define KEY_RADIUS              4
 211
 212 #define KEY_TOP                 511
 213 #define KEY_BOTTOM              567
 214
 215 #define KEY1_LEFT               LEN_TO_PIX(KEY1_X - KEY_RADIUS)
 216 #define KEY1_RIGHT              LEN_TO_PIX(KEY1_X + KEY_RADIUS)
 217 #define KEY2_LEFT               LEN_TO_PIX(KEY2_X - KEY_RADIUS)
 218 #define KEY2_RIGHT              LEN_TO_PIX(KEY2_X + KEY_RADIUS)
 219 #define KEY3_LEFT               LEN_TO_PIX(KEY3_X - KEY_RADIUS)
 220 #define KEY3_RIGHT              LEN_TO_PIX(KEY3_X + KEY_RADIUS)
 221 #define KEY4_LEFT               LEN_TO_PIX(KEY4_X - KEY_RADIUS)
 222 #define KEY4_RIGHT              LEN_TO_PIX(KEY4_X + KEY_RADIUS)
 223
 224  struct KeyInfo
 225 {
 226         unsigned int left;
 227         unsigned int right;
 228         int key;
 229         int status;
 230
 231 };
 232
 233 static struct KeyInfo panel_key_info[]={
 234 {KEY1_LEFT, KEY1_RIGHT, KEY_HOME, 0},
 235 {KEY2_LEFT, KEY2_RIGHT, KEY_MENU, 0},
 236 {KEY3_LEFT, KEY3_RIGHT, KEY_BACK, 0},
 237 {KEY4_LEFT, KEY4_RIGHT, KEY_SEARCH, 0},
 238 };
 239 //end by zhao
 240
 241 static void xpt2046_enable(struct xpt2046 *ts);
 242 static void xpt2046_disable(struct xpt2046 *ts);
 243
 244 static int device_suspended(struct device *dev)
 245 {
 246         struct xpt2046 *ts = dev_get_drvdata(dev);
 247         return ts->is_suspended || ts->disabled;
 248 }
 249
 250 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
 251 {
 252         struct spi_device       *spi = to_spi_device(dev);
 253         struct xpt2046          *ts = dev_get_drvdata(dev);
 254         struct dfr_req          *req = kzalloc(sizeof *req, GFP_KERNEL);
 255         int                     status;
 256
 257         if (!req)
 258                 return -ENOMEM;
 259
 260         spi_message_init(&req->msg);
 261
 262         /* take sample */
 263         req->command = (u8) command;
 264         req->xfer[0].tx_buf = &req->command;
 265         req->xfer[0].len = 1;
 266         spi_message_add_tail(&req->xfer[0], &req->msg);
 267
 268         req->xfer[1].rx_buf = &req->sample;
 269         req->xfer[1].len = 2;
 270         //xpt2046printk("-------------1 sample 0x%x,command=%x--------------------\n",req->sample,(u8)command); //add by zhao
 271         spi_message_add_tail(&req->xfer[1], &req->msg);
 272
 273         /* converter in low power mode & enable PENIRQ */
 274         req->pwrdown= PWRDOWN;
 275         req->xfer[2].tx_buf = &req->pwrdown;
 276         req->xfer[2].len = 1;
 277         spi_message_add_tail(&req->xfer[2], &req->msg);
 278
 279         req->xfer[3].rx_buf = &req->dummy;
 280         req->xfer[3].len = 2;
 281         CS_CHANGE(req->xfer[3]);
 282         spi_message_add_tail(&req->xfer[3], &req->msg);
 283
 284         ts->irq_disabled = 1;
 285         disable_irq(spi->irq);
 286         status = spi_sync(spi, &req->msg);
 287         ts->irq_disabled = 0;
 288         enable_irq(spi->irq);
 289         //xpt2046printk("-------------2 sample 0x%x-----------------\n",req->sample);   //add by zhao
 290         if (status == 0) {
 291                 /* on-wire is a must-ignore bit, a BE12 value, then padding */
 292                 status = be16_to_cpu(req->sample);
 293                 status = status >> 3;
 294                 status &= 0x0fff;
 295                 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
 296         }
 297
 298         kfree(req);
 299         return status;
 300 }
 301
 302
 303
 304 /*--------------------------------------------------------------------------*/
 305
 306 static int get_pendown_state(struct xpt2046 *ts)
 307 {
 308         if (ts->get_pendown_state)
 309                 return ts->get_pendown_state();
 310
 311         return !gpio_get_value(ts->gpio_pendown);
 312 }
 313
 314 static void null_wait_for_sync(void)
 315 {
 316
 317 }
 318
 319 /*
 320  * PENIRQ only kicks the timer.  The timer only reissues the SPI transfer,
 321  * to retrieve touchscreen status.
 322  *
 323  * The SPI transfer completion callback does the real work.  It reports
 324  * touchscreen events and reactivates the timer (or IRQ) as appropriate.
 325  */
 326
 327 static void xpt2046_rx(void *xpt)
 328 {
 329         struct xpt2046          *ts = xpt;
 330         struct xpt2046_platform_data    *pdata = ts->spi->dev.platform_data;
 331         struct xpt2046_packet   *packet = ts->packet;
 332         unsigned                Rt = 1;
 333         u16                     x, y;
 334         u8                      i;
 335         /* xpt2046_rx_val() did in-place conversion (including byteswap) from
 336          * on-the-wire format as part of debouncing to get stable readings.
 337          */
 338         x = packet->tc.x;
 339         y = packet->tc.y;
 340
 341         xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
 342
 343         /* range filtering */
 344         if (x == MAX_12BIT)
 345                 x = 0;
 346
 347         /* Sample found inconsistent by debouncing or pressure is beyond
 348          * the maximum. Don't report it to user space, repeat at least
 349          * once more the measurement
 350          */
 351         if (packet->tc.ignore) {
 352
 353                 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
 354
 355                 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 356                               HRTIMER_MODE_REL);
 357                 return;
 358         }
 359
 360         /* Maybe check the pendown state before reporting. This discards
 361          * false readings when the pen is lifted.
 362          */
 363         if (ts->penirq_recheck_delay_usecs) {
 364                 udelay(ts->penirq_recheck_delay_usecs);
 365                 if (!get_pendown_state(ts))
 366                 {
 367                         xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
 368                         Rt = 0;
 369                 }
 370         }
 371
 372         /* NOTE: We can't rely on the pressure to determine the pen down
 373          * state, even this controller has a pressure sensor.  The pressure
 374          * value can fluctuate for quite a while after lifting the pen and
 375          * in some cases may not even settle at the expected value.
 376          *
 377          * The only safe way to check for the pen up condition is in the
 378          * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 379          */
 380         if (Rt) {
 381                 struct input_dev *input = ts->input;
 382 /*              if (!ts->pendown) {
 383                         input_report_key(input, BTN_TOUCH, 1);
 384                         ts->pendown = 1;
 385                         xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 386                 }
 387 */
 388                 x =  AD_TO_X(x);
 389                 y =  AD_TO_Y(y);
 390
 391                 if (ts->swap_xy)
 392                         swap(x, y);
 393
 394                 //add by zhao
 395                 if ((y > KEY_TOP) && (y < KEY_BOTTOM))
 396                 {
 397                         for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 398                         {
 399                                 if ((x > panel_key_info[i].left) && (x < panel_key_info[i].right))
 400                                 {
 401                                         panel_key_info[i].status = 1;
 402                                         input_report_key(input, panel_key_info[i].key,1);
 403                                         input_sync(input);
 404                                         xpt2046printk("***>%s:input_report_key(%2d)(%4d , %4d)\n",__FUNCTION__,panel_key_info[i].key, x, y);
 405                                 }
 406                         }
 407
 408                 }
 409                 else if (y <= pdata->y_max)
 410                 {
 411                         if (!ts->pendown) {
 412                                 input_report_key(input, BTN_TOUCH, 1);
 413                                 ts->pendown = 1;
 414                                 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 415                         }
 416                         input_report_abs(input, ABS_X, x);
 417                         input_report_abs(input, ABS_Y, y);
 418                         input_sync(input);
 419                         xpt2046printk("***>%s:input_report_abs(%4d , %4d)\n",__FUNCTION__,x, y);
 420                 }
 421
 422         }
 423
 424         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 425                         HRTIMER_MODE_REL);
 426 }
 427
 428 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
 429 {
 430         struct xpt2046          *ts = xpt;
 431         static int average_val[2];
 432
 433
 434 /*      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__,
 435                 data_idx,ts->last_read,
 436           ts->read_cnt,ts->debounce_max,
 437                 abs(ts->last_read - *val),ts->debounce_tol,
 438                 ts->read_rep,ts->debounce_rep);
 439 */
 440         if(*val == 4095 || *val == 0)
 441         {
 442                 ts->read_cnt = 0;
 443                 ts->last_read = 0;
 444                 memset(average_val,0,sizeof(average_val));
 445                 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
 446                 return XPT2046_FILTER_IGNORE;
 447         }
 448         /* discard the first sample. */
 449         if(!ts->read_cnt)
 450         {
 451                 ts->read_cnt++;
 452                 return XPT2046_FILTER_REPEAT;
 453         }
 454
 455         if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
 456                 /* Start over collecting consistent readings. */
 457                 ts->read_rep = 1;
 458                 average_val[data_idx] = *val;
 459                 /* Repeat it, if this was the first read or the read
 460                  * wasn't consistent enough. */
 461                 if (ts->read_cnt < ts->debounce_max) {
 462                         ts->last_read = *val;
 463                         ts->read_cnt++;
 464                         return XPT2046_FILTER_REPEAT;
 465                 } else {
 466                         /* Maximum number of debouncing reached and still
 467                          * not enough number of consistent readings. Abort
 468                          * the whole sample, repeat it in the next sampling
 469                          * period.
 470                          */
 471                         ts->read_cnt = 0;
 472                         ts->last_read = 0;
 473                         memset(average_val,0,sizeof(average_val));
 474                         xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
 475                         return XPT2046_FILTER_IGNORE;
 476                 }
 477         }
 478         else {
 479                 average_val[data_idx] += *val;
 480
 481                 if (++ts->read_rep >= ts->debounce_rep) {
 482                         /* Got a good reading for this coordinate,
 483                          * go for the next one. */
 484                         ts->read_cnt = 0;
 485                         ts->read_rep = 0;
 486                         ts->last_read = 0;
 487                         *val = average_val[data_idx]/(ts->debounce_rep);
 488                         return XPT2046_FILTER_OK;
 489                 } else {
 490                         /* Read more values that are consistent. */
 491                         ts->read_cnt++;
 492
 493                         return XPT2046_FILTER_REPEAT;
 494                 }
 495         }
 496 }
 497
 498 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
 499 {
 500         return XPT2046_FILTER_OK;
 501 }
 502
 503 static void xpt2046_rx_val(void *xpt)
 504 {
 505         struct xpt2046 *ts = xpt;
 506         struct xpt2046_packet *packet = ts->packet;
 507         struct spi_message *m;
 508         struct spi_transfer *t;
 509         int val;
 510         int action;
 511         int status;
 512
 513         m = &ts->msg[ts->msg_idx];
 514         t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 515
 516         /* adjust:  on-wire is a must-ignore bit, a BE12 value, then padding;
 517          * built from two 8 bit values written msb-first.
 518          */
 519         val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
 520
 521 //      xpt2046printk("***>%s:value=%d, x=%d, y=%d, rx_buf=%d\n",__FUNCTION__,val,packet->tc.x,packet->tc.y,*(u16 *)t->rx_buf);
 522
 523         action = ts->filter(ts->filter_data, ts->msg_idx, &val);
 524         switch (action) {
 525         case XPT2046_FILTER_REPEAT:
 526                 break;
 527         case XPT2046_FILTER_IGNORE:
 528                 packet->tc.ignore = 1;
 529                 /* Last message will contain xpt2046_rx() as the
 530                  * completion function.
 531                  */
 532                 m = ts->last_msg;
 533                 break;
 534         case XPT2046_FILTER_OK:
 535                 *(u16 *)t->rx_buf = val;
 536                 packet->tc.ignore = 0;
 537                 m = &ts->msg[++ts->msg_idx];
 538                 break;
 539         default:
 540                 BUG();
 541         }
 542         ts->wait_for_sync();
 543         status = spi_async(ts->spi, m);
 544         if (status)
 545                 dev_err(&ts->spi->dev, "spi_async --> %d\n",
 546                                 status);
 547 }
 548
 549 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
 550 {
 551         struct xpt2046  *ts = container_of(handle, struct xpt2046, timer);
 552         int             status = 0;
 553         int             i;
 554
 555         spin_lock(&ts->lock);
 556
 557         if (unlikely(!get_pendown_state(ts) ||
 558                      device_suspended(&ts->spi->dev))) {
 559                                         //add by zhao
 560                 struct input_dev *input = ts->input;
 561                 for(i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 562                 {
 563                         if (panel_key_info[i].status)
 564                         {
 565                                 input_report_key(input, panel_key_info[i].key, 0);
 566                                 panel_key_info[i].status = 0;
 567                                 input_sync(input);
 568                                 xpt2046printk("***>%s:input_report_key(KEY up)\n",__FUNCTION__);
 569                         }
 570                 }
 571
 572                 if (ts->pendown) {
 573                         input_report_key(input, BTN_TOUCH, 0);
 574                         input_sync(input);
 575                         ts->pendown = 0;
 576
 577                         xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
 578                 }
 579
 580                 /* measurement cycle ended */
 581                 if (!device_suspended(&ts->spi->dev)) {
 582                         xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
 583                         ts->irq_disabled = 0;
 584                         enable_irq(ts->spi->irq);
 585                 }
 586                 ts->pending = 0;
 587         } else {
 588                 /* pen is still down, continue with the measurement */
 589                 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
 590                 ts->msg_idx = 0;
 591                 ts->wait_for_sync();
 592                 status = spi_async(ts->spi, &ts->msg[0]);
 593                 if (status)
 594                         dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
 595         }
 596
 597         spin_unlock(&ts->lock);
 598         return HRTIMER_NORESTART;
 599 }
 600
 601 static irqreturn_t xpt2046_irq(int irq, void *handle)
 602 {
 603         struct xpt2046 *ts = handle;
 604         unsigned long flags;
 605         xpt2046printk("\n-----------xpt2046_irq------------------\n");
 606         xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
 607
 608         spin_lock_irqsave(&ts->lock, flags);
 609
 610         if (likely(get_pendown_state(ts))) {
 611                 if (!ts->irq_disabled) {
 612                         /* The ARM do_simple_IRQ() dispatcher doesn't act
 613                          * like the other dispatchers:  it will report IRQs
 614                          * even after they've been disabled.  We work around
 615                          * that here.  (The "generic irq" framework may help...)
 616                          */
 617                         ts->irq_disabled = 1;
 618                         disable_irq_nosync(ts->spi->irq);
 619                         ts->pending = 1;
 620                         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
 621                                         HRTIMER_MODE_REL);
 622                 }
 623         }
 624         spin_unlock_irqrestore(&ts->lock, flags);
 625
 626         return IRQ_HANDLED;
 627 }
 628
 629 /*--------------------------------------------------------------------------*/
 630
 631 /* Must be called with ts->lock held */
 632 static void xpt2046_disable(struct xpt2046 *ts)
 633 {
 634         if (ts->disabled)
 635                 return;
 636
 637         ts->disabled = 1;
 638
 639         /* are we waiting for IRQ, or polling? */
 640         if (!ts->pending) {
 641                 ts->irq_disabled = 1;
 642                 disable_irq(ts->spi->irq);
 643         } else {
 644                 /* the timer will run at least once more, and
 645                  * leave everything in a clean state, IRQ disabled
 646                  */
 647                 while (ts->pending) {
 648                         spin_unlock_irq(&ts->lock);
 649                         msleep(1);
 650                         spin_lock_irq(&ts->lock);
 651                 }
 652         }
 653
 654         /* we know the chip's in lowpower mode since we always
 655          * leave it that way after every request
 656          */
 657 }
 658
 659 /* Must be called with ts->lock held */
 660 static void xpt2046_enable(struct xpt2046 *ts)
 661 {
 662         if (!ts->disabled)
 663                 return;
 664
 665         ts->disabled = 0;
 666         ts->irq_disabled = 0;
 667         enable_irq(ts->spi->irq);
 668 }
 669
 670 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
 671 {
 672         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 673
 674         spin_lock_irq(&ts->lock);
 675
 676         ts->is_suspended = 1;
 677         xpt2046_disable(ts);
 678
 679         spin_unlock_irq(&ts->lock);
 680
 681         return 0;
 682
 683 }
 684
 685 static int xpt2046_resume(struct spi_device *spi)
 686 {
 687         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 688
 689         spin_lock_irq(&ts->lock);
 690
 691         ts->is_suspended = 0;
 692         xpt2046_enable(ts);
 693
 694         spin_unlock_irq(&ts->lock);
 695
 696         return 0;
 697 }
 698
 699 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
 700 {
 701         struct xpt2046_platform_data *pdata = spi->dev.platform_data;
 702         int err;
 703
 704         /* REVISIT when the irq can be triggered active-low, or if for some
 705          * reason the touchscreen isn't hooked up, we don't need to access
 706          * the pendown state.
 707          */
 708         if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
 709                 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
 710                 return -EINVAL;
 711         }
 712
 713         if (pdata->get_pendown_state) {
 714                 ts->get_pendown_state = pdata->get_pendown_state;
 715                 return 0;
 716         }
 717
 718     if (pdata->io_init) {
 719         err = pdata->io_init();
 720         if (err)
 721             dev_err(&spi->dev, "xpt2046 io_init fail\n");
 722     }
 723
 724         err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
 725         if (err) {
 726                 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
 727                                 pdata->gpio_pendown);
 728                 return err;
 729         }
 730
 731     err = gpio_direction_input(pdata->gpio_pendown);
 732     if (err) {
 733                 dev_err(&spi->dev, "failed to switch GPIO to input%d\n",
 734                                 pdata->gpio_pendown);
 735                 return err;
 736     }
 737
 738     gpio_pull_updown(pdata->gpio_pendown,GPIOPullUp);
 739
 740         ts->gpio_pendown = pdata->gpio_pendown;
 741         return 0;
 742 }
 743
 744
 745 static int __devinit xpt2046_probe(struct spi_device *spi)
 746 {
 747         struct xpt2046                  *ts;
 748         struct xpt2046_packet           *packet;
 749         struct input_dev                *input_dev;
 750         struct xpt2046_platform_data    *pdata = spi->dev.platform_data;
 751         struct spi_message              *m;
 752         struct spi_transfer             *x;
 753         int                             vref;
 754         int                             err;
 755         int                             i;
 756
 757         if (!spi->irq) {
 758                 dev_dbg(&spi->dev, "no IRQ?\n");
 759                 return -ENODEV;
 760         }
 761         else{
 762                 spi->irq = gpio_to_irq(spi->irq);
 763                 dev_dbg(&spi->dev, "no IRQ?\n");
 764         }
 765
 766     if (!pdata) {
 767         dev_err(&spi->dev, "empty platform_data\n");
 768         return -EFAULT;
 769     }
 770
 771         /* don't exceed max specified sample rate */
 772         if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
 773                 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
 774                                 (spi->max_speed_hz/SAMPLE_BITS)/1000);
 775                 return -EINVAL;
 776         }
 777
 778         /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
 779          * that even if the hardware can do that, the SPI controller driver
 780          * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 781          */
 782         spi->bits_per_word = 8;
 783         spi->mode = SPI_MODE_0;
 784         err = spi_setup(spi);
 785         if (err < 0)
 786                 return err;
 787
 788         ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
 789         packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
 790         input_dev = input_allocate_device();
 791         if (!ts || !packet || !input_dev) {
 792                 err = -ENOMEM;
 793                 goto err_free_mem;
 794         }
 795
 796         dev_set_drvdata(&spi->dev, ts);
 797
 798         ts->packet = packet;
 799         ts->spi = spi;
 800         ts->input = input_dev;
 801         ts->swap_xy = pdata->swap_xy;
 802
 803         hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 804         ts->timer.function = xpt2046_timer;
 805
 806         spin_lock_init(&ts->lock);
 807
 808         ts->model = pdata->model ? : 2046;
 809
 810         if (pdata->filter != NULL) {
 811                 if (pdata->filter_init != NULL) {
 812                         err = pdata->filter_init(pdata, &ts->filter_data);
 813                         if (err < 0)
 814                                 goto err_free_mem;
 815                 }
 816                 ts->filter = pdata->filter;
 817                 ts->filter_cleanup = pdata->filter_cleanup;
 818         } else if (pdata->debounce_max) {
 819                 ts->debounce_max = pdata->debounce_max;
 820                 if (ts->debounce_max < pdata->debounce_rep)
 821                         ts->debounce_max = pdata->debounce_rep;
 822                 ts->debounce_tol = pdata->debounce_tol;
 823                 ts->debounce_rep = pdata->debounce_rep;
 824                 ts->filter = xpt2046_debounce;
 825                 ts->filter_data = ts;
 826         } else
 827                 ts->filter = xpt2046_no_filter;
 828
 829         err = setup_pendown(spi, ts);
 830         if (err)
 831                 goto err_cleanup_filter;
 832
 833         if (pdata->penirq_recheck_delay_usecs)
 834                 ts->penirq_recheck_delay_usecs =
 835                                 pdata->penirq_recheck_delay_usecs;
 836
 837         ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
 838
 839         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
 840         snprintf(ts->name, sizeof(ts->name), "XPT%d Touchscreen", ts->model);
 841
 842         input_dev->name = ts->name;
 843         input_dev->phys = ts->phys;
 844         input_dev->dev.parent = &spi->dev;
 845
 846         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 847         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 848         //add by zhao
 849         for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 850                 set_bit(panel_key_info[i].key, input_dev->keybit);
 851         clear_bit(0, input_dev->keybit);
 852         //end
 853         input_set_abs_params(input_dev, ABS_X,
 854                         pdata->x_min ? : 0,
 855                         pdata->x_max ? : MAX_12BIT,
 856                         0, 0);
 857         input_set_abs_params(input_dev, ABS_Y,
 858                         pdata->y_min ? : 0,
 859                         pdata->y_max ? : MAX_12BIT,
 860                         0, 0);
 861
 862         vref = pdata->keep_vref_on;
 863
 864         /* set up the transfers to read touchscreen state; this assumes we
 865          * use formula #2 for pressure, not #3.
 866          */
 867         m = &ts->msg[0];
 868         x = ts->xfer;
 869
 870         spi_message_init(m);
 871
 872         /* y- still on; turn on only y+ (and ADC) */
 873         packet->read_y = READ_Y(vref);
 874         xpt2046printk("-------------read Y 0x%x\n",packet->read_y);     //add by zhao
 875         x->tx_buf = &packet->read_y;
 876         x->len = 1;
 877         spi_message_add_tail(x, m);
 878
 879         x++;
 880         x->rx_buf = &packet->tc.y;
 881         x->len = 2;
 882         spi_message_add_tail(x, m);
 883
 884         m->complete = xpt2046_rx_val;
 885         m->context = ts;
 886
 887         m++;
 888         spi_message_init(m);
 889
 890         /* turn y- off, x+ on, then leave in lowpower */
 891         x++;
 892         packet->read_x = READ_X(vref);
 893         xpt2046printk("-------------read X 0x%x\n",packet->read_x);     //add by zhao
 894         x->tx_buf = &packet->read_x;
 895         x->len = 1;
 896         spi_message_add_tail(x, m);
 897
 898         x++;
 899         x->rx_buf = &packet->tc.x;
 900         x->len = 2;
 901         spi_message_add_tail(x, m);
 902
 903         m->complete = xpt2046_rx_val;
 904         m->context = ts;
 905
 906         /* power down */
 907         m++;
 908         spi_message_init(m);
 909
 910         x++;
 911         packet->pwrdown = PWRDOWN;
 912         x->tx_buf = &packet->pwrdown;
 913         x->len = 1;
 914         spi_message_add_tail(x, m);
 915
 916         x++;
 917         x->rx_buf = &packet->dummy;
 918         x->len = 2;
 919         CS_CHANGE(*x);
 920         spi_message_add_tail(x, m);
 921
 922         m->complete = xpt2046_rx;
 923         m->context = ts;
 924
 925         ts->last_msg = m;
 926         xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
 927         if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
 928                         spi->dev.driver->name, ts)) {
 929                 printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
 930                 err = request_irq(spi->irq, xpt2046_irq,
 931                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 932                                   spi->dev.driver->name, ts);
 933                 if (err) {
 934                         dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
 935                         goto err_free_gpio;
 936                 }
 937         }
 938
 939         /* take a first sample, leaving nPENIRQ active and vREF off; avoid
 940          * the touchscreen, in case it's not connected.
 941          */
 942         xpt2046_read12_dfr(&spi->dev,READ_X(1));
 943
 944         err = input_register_device(input_dev);
 945         if (err)
 946                 goto err_remove_attr_group;
 947   printk("xpt2046_ts: driver initialized\n");
 948         return 0;
 949
 950  err_remove_attr_group:
 951         free_irq(spi->irq, ts);
 952  err_free_gpio:
 953         if (ts->gpio_pendown != -1)
 954                 gpio_free(ts->gpio_pendown);
 955  err_cleanup_filter:
 956         if (ts->filter_cleanup)
 957                 ts->filter_cleanup(ts->filter_data);
 958  err_free_mem:
 959         input_free_device(input_dev);
 960         kfree(packet);
 961         kfree(ts);
 962         return err;
 963 }
 964
 965 static int __devexit xpt2046_remove(struct spi_device *spi)
 966 {
 967         struct xpt2046          *ts = dev_get_drvdata(&spi->dev);
 968
 969         input_unregister_device(ts->input);
 970
 971         xpt2046_suspend(spi, PMSG_SUSPEND);
 972
 973         free_irq(ts->spi->irq, ts);
 974         /* suspend left the IRQ disabled */
 975         enable_irq(ts->spi->irq);
 976
 977         if (ts->gpio_pendown != -1)
 978                 gpio_free(ts->gpio_pendown);
 979
 980         if (ts->filter_cleanup)
 981                 ts->filter_cleanup(ts->filter_data);
 982
 983         kfree(ts->packet);
 984         kfree(ts);
 985
 986         dev_dbg(&spi->dev, "unregistered touchscreen\n");
 987         return 0;
 988 }
 989
 990 static struct spi_driver xpt2046_driver = {
 991         .driver = {
 992                 .name   = "xpt2046_ts",
 993                 .bus    = &spi_bus_type,
 994                 .owner  = THIS_MODULE,
 995         },
 996         .probe          = xpt2046_probe,
 997         .remove         = __devexit_p(xpt2046_remove),
 998         .suspend        = xpt2046_suspend,
 999         .resume         = xpt2046_resume,
1000 };
1001
1002 static int __init xpt2046_init(void)
1003 {
1004         return spi_register_driver(&xpt2046_driver);
1005 }
1006 late_initcall_sync(xpt2046_init);
1007
1008 static void __exit xpt2046_exit(void)
1009 {
1010         spi_unregister_driver(&xpt2046_driver);
1011 }
1012 module_exit(xpt2046_exit);
1013
1014 MODULE_DESCRIPTION("rk2818 spi xpt2046 TouchScreen Driver");
1015 MODULE_LICENSE("GPL");
1016 MODULE_ALIAS("spi:xpt2046");