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_platform_data    *pdata = ts->spi->dev.platform_data;
 347         struct xpt2046_packet   *packet = ts->packet;
 348         unsigned                Rt = 1;
 349         u16                     x, y;
 350         u8                      i;
 351         /* xpt2046_rx_val() did in-place conversion (including byteswap) from
 352          * on-the-wire format as part of debouncing to get stable readings.
 353          */
 354         x = packet->tc.x;
 355         y = packet->tc.y;
 356
 357         xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
 358
 359         /* range filtering */
 360         if (x == MAX_12BIT)
 361                 x = 0;
 362
 363         /* Sample found inconsistent by debouncing or pressure is beyond
 364          * the maximum. Don't report it to user space, repeat at least
 365          * once more the measurement
 366          */
 367         if (packet->tc.ignore) {
 368
 369                 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
 370
 371                 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 372                               HRTIMER_MODE_REL);
 373                 return;
 374         }
 375
 376         /* Maybe check the pendown state before reporting. This discards
 377          * false readings when the pen is lifted.
 378          */
 379         if (ts->penirq_recheck_delay_usecs) {
 380                 udelay(ts->penirq_recheck_delay_usecs);
 381                 if (!get_pendown_state(ts))
 382                 {
 383                         xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
 384                         Rt = 0;
 385                 }
 386         }
 387
 388         /* NOTE: We can't rely on the pressure to determine the pen down
 389          * state, even this controller has a pressure sensor.  The pressure
 390          * value can fluctuate for quite a while after lifting the pen and
 391          * in some cases may not even settle at the expected value.
 392          *
 393          * The only safe way to check for the pen up condition is in the
 394          * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 395          */
 396         if (Rt) {
 397                 struct input_dev *input = ts->input;
 398 /*              if (!ts->pendown) {
 399                         input_report_key(input, BTN_TOUCH, 1);
 400                         ts->pendown = 1;
 401                         xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 402                 }
 403 */
 404                 x =  AD_TO_X(x);
 405                 y =  AD_TO_Y(y);
 406
 407                 if (ts->swap_xy)
 408                         swap(x, y);
 409
 410                 //add by zhao
 411                 if ((y > KEY_TOP) && (y < KEY_BOTTOM))
 412                 {
 413                         for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 414                         {
 415                                 if ((x > panel_key_info[i].left) && (x < panel_key_info[i].right))
 416                                 {
 417                                         panel_key_info[i].status = 1;
 418                                         input_report_key(input, panel_key_info[i].key,1);
 419                                         input_sync(input);
 420                                         xpt2046printk("***>%s:input_report_key(%2d)(%4d , %4d)\n",__FUNCTION__,panel_key_info[i].key, x, y);
 421                                 }
 422                         }
 423
 424                 }
 425                 else if (y <= pdata->y_max)
 426                 {
 427                         if (!ts->pendown) {
 428                                 input_report_key(input, BTN_TOUCH, 1);
 429                                 ts->pendown = 1;
 430                                 xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 431                         }
 432                         input_report_abs(input, ABS_X, x);
 433                         input_report_abs(input, ABS_Y, y);
 434                         input_sync(input);
 435                         xpt2046printk("***>%s:input_report_abs(%4d , %4d)\n",__FUNCTION__,x, y);
 436                 }
 437
 438         }
 439
 440         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 441                         HRTIMER_MODE_REL);
 442 }
 443
 444 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
 445 {
 446         struct xpt2046          *ts = xpt;
 447         static int average_val[2];
 448
 449
 450 /*      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__,
 451                 data_idx,ts->last_read,
 452           ts->read_cnt,ts->debounce_max,
 453                 abs(ts->last_read - *val),ts->debounce_tol,
 454                 ts->read_rep,ts->debounce_rep);
 455 */
 456         if(*val == 4095 || *val == 0)
 457         {
 458                 ts->read_cnt = 0;
 459                 ts->last_read = 0;
 460                 memset(average_val,0,sizeof(average_val));
 461                 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
 462                 return XPT2046_FILTER_IGNORE;
 463         }
 464         /* discard the first sample. */
 465         if(!ts->read_cnt)
 466         {
 467                 ts->read_cnt++;
 468                 return XPT2046_FILTER_REPEAT;
 469         }
 470
 471         if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
 472                 /* Start over collecting consistent readings. */
 473                 ts->read_rep = 1;
 474                 average_val[data_idx] = *val;
 475                 /* Repeat it, if this was the first read or the read
 476                  * wasn't consistent enough. */
 477                 if (ts->read_cnt < ts->debounce_max) {
 478                         ts->last_read = *val;
 479                         ts->read_cnt++;
 480                         return XPT2046_FILTER_REPEAT;
 481                 } else {
 482                         /* Maximum number of debouncing reached and still
 483                          * not enough number of consistent readings. Abort
 484                          * the whole sample, repeat it in the next sampling
 485                          * period.
 486                          */
 487                         ts->read_cnt = 0;
 488                         ts->last_read = 0;
 489                         memset(average_val,0,sizeof(average_val));
 490                         xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
 491                         return XPT2046_FILTER_IGNORE;
 492                 }
 493         }
 494         else {
 495                 average_val[data_idx] += *val;
 496
 497                 if (++ts->read_rep >= ts->debounce_rep) {
 498                         /* Got a good reading for this coordinate,
 499                          * go for the next one. */
 500                         ts->read_cnt = 0;
 501                         ts->read_rep = 0;
 502                         ts->last_read = 0;
 503                         *val = average_val[data_idx]/(ts->debounce_rep);
 504                         return XPT2046_FILTER_OK;
 505                 } else {
 506                         /* Read more values that are consistent. */
 507                         ts->read_cnt++;
 508
 509                         return XPT2046_FILTER_REPEAT;
 510                 }
 511         }
 512 }
 513
 514 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
 515 {
 516         return XPT2046_FILTER_OK;
 517 }
 518
 519 static void xpt2046_rx_val(void *xpt)
 520 {
 521         struct xpt2046 *ts = xpt;
 522         struct xpt2046_packet *packet = ts->packet;
 523         struct spi_message *m;
 524         struct spi_transfer *t;
 525         int val;
 526         int action;
 527         int status;
 528
 529         m = &ts->msg[ts->msg_idx];
 530         t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 531
 532         /* adjust:  on-wire is a must-ignore bit, a BE12 value, then padding;
 533          * built from two 8 bit values written msb-first.
 534          */
 535         val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
 536
 537 //      xpt2046printk("***>%s:value=%d, x=%d, y=%d, rx_buf=%d\n",__FUNCTION__,val,packet->tc.x,packet->tc.y,*(u16 *)t->rx_buf);
 538
 539         action = ts->filter(ts->filter_data, ts->msg_idx, &val);
 540         switch (action) {
 541         case XPT2046_FILTER_REPEAT:
 542                 break;
 543         case XPT2046_FILTER_IGNORE:
 544                 packet->tc.ignore = 1;
 545                 /* Last message will contain xpt2046_rx() as the
 546                  * completion function.
 547                  */
 548                 m = ts->last_msg;
 549                 break;
 550         case XPT2046_FILTER_OK:
 551                 *(u16 *)t->rx_buf = val;
 552                 packet->tc.ignore = 0;
 553                 m = &ts->msg[++ts->msg_idx];
 554                 break;
 555         default:
 556                 BUG();
 557         }
 558         ts->wait_for_sync();
 559         status = spi_async(ts->spi, m);
 560         if (status)
 561                 dev_err(&ts->spi->dev, "spi_async --> %d\n",
 562                                 status);
 563 }
 564
 565 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
 566 {
 567         struct xpt2046  *ts = container_of(handle, struct xpt2046, timer);
 568         int             status = 0;
 569         int             i;
 570
 571         spin_lock(&ts->lock);
 572
 573         if (unlikely(!get_pendown_state(ts) ||
 574                      device_suspended(&ts->spi->dev))) {
 575                                         //add by zhao
 576                 struct input_dev *input = ts->input;
 577                 for(i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 578                 {
 579                         if (panel_key_info[i].status)
 580                         {
 581                                 input_report_key(input, panel_key_info[i].key, 0);
 582                                 panel_key_info[i].status = 0;
 583                                 input_sync(input);
 584                                 xpt2046printk("***>%s:input_report_key(KEY up)\n",__FUNCTION__);
 585                         }
 586                 }
 587
 588                 if (ts->pendown) {
 589                         input_report_key(input, BTN_TOUCH, 0);
 590                         input_sync(input);
 591                         ts->pendown = 0;
 592
 593                         xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
 594                 }
 595
 596                 /* measurement cycle ended */
 597                 if (!device_suspended(&ts->spi->dev)) {
 598                         xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
 599                         ts->irq_disabled = 0;
 600                         enable_irq(ts->spi->irq);
 601                 }
 602                 ts->pending = 0;
 603         } else {
 604                 /* pen is still down, continue with the measurement */
 605                 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
 606                 ts->msg_idx = 0;
 607                 ts->wait_for_sync();
 608                 status = spi_async(ts->spi, &ts->msg[0]);
 609                 if (status)
 610                         dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
 611         }
 612
 613         spin_unlock(&ts->lock);
 614         return HRTIMER_NORESTART;
 615 }
 616
 617 static irqreturn_t xpt2046_irq(int irq, void *handle)
 618 {
 619         struct xpt2046 *ts = handle;
 620         unsigned long flags;
 621         xpt2046printk("\n-----------xpt2046_irq------------------\n");
 622         xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
 623
 624         spin_lock_irqsave(&ts->lock, flags);
 625
 626         if (likely(get_pendown_state(ts))) {
 627                 if (!ts->irq_disabled) {
 628                         /* The ARM do_simple_IRQ() dispatcher doesn't act
 629                          * like the other dispatchers:  it will report IRQs
 630                          * even after they've been disabled.  We work around
 631                          * that here.  (The "generic irq" framework may help...)
 632                          */
 633                         ts->irq_disabled = 1;
 634                         disable_irq_nosync(ts->spi->irq);
 635                         ts->pending = 1;
 636                         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
 637                                         HRTIMER_MODE_REL);
 638                 }
 639         }
 640         spin_unlock_irqrestore(&ts->lock, flags);
 641
 642         return IRQ_HANDLED;
 643 }
 644
 645 /*--------------------------------------------------------------------------*/
 646
 647 /* Must be called with ts->lock held */
 648 static void xpt2046_disable(struct xpt2046 *ts)
 649 {
 650         if (ts->disabled)
 651                 return;
 652
 653         ts->disabled = 1;
 654
 655         /* are we waiting for IRQ, or polling? */
 656         if (!ts->pending) {
 657                 ts->irq_disabled = 1;
 658                 disable_irq(ts->spi->irq);
 659         } else {
 660                 /* the timer will run at least once more, and
 661                  * leave everything in a clean state, IRQ disabled
 662                  */
 663                 while (ts->pending) {
 664                         spin_unlock_irq(&ts->lock);
 665                         msleep(1);
 666                         spin_lock_irq(&ts->lock);
 667                 }
 668         }
 669
 670         /* we know the chip's in lowpower mode since we always
 671          * leave it that way after every request
 672          */
 673 }
 674
 675 /* Must be called with ts->lock held */
 676 static void xpt2046_enable(struct xpt2046 *ts)
 677 {
 678         if (!ts->disabled)
 679                 return;
 680
 681         ts->disabled = 0;
 682         ts->irq_disabled = 0;
 683         enable_irq(ts->spi->irq);
 684 }
 685
 686 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
 687 {
 688         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 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
 701 static int xpt2046_resume(struct spi_device *spi)
 702 {
 703         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 704
 705         spin_lock_irq(&ts->lock);
 706
 707         ts->is_suspended = 0;
 708         xpt2046_enable(ts);
 709
 710         spin_unlock_irq(&ts->lock);
 711
 712         return 0;
 713 }
 714
 715 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
 716 {
 717         struct xpt2046_platform_data *pdata = spi->dev.platform_data;
 718         int err;
 719
 720         /* REVISIT when the irq can be triggered active-low, or if for some
 721          * reason the touchscreen isn't hooked up, we don't need to access
 722          * the pendown state.
 723          */
 724         if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
 725                 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
 726                 return -EINVAL;
 727         }
 728
 729         if (pdata->get_pendown_state) {
 730                 ts->get_pendown_state = pdata->get_pendown_state;
 731                 return 0;
 732         }
 733
 734     if (pdata->io_init) {
 735         err = pdata->io_init();
 736         if (err)
 737             dev_err(&spi->dev, "xpt2046 io_init fail\n");
 738     }
 739
 740         err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
 741         if (err) {
 742                 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
 743                                 pdata->gpio_pendown);
 744                 return err;
 745         }
 746
 747         ts->gpio_pendown = pdata->gpio_pendown;
 748         return 0;
 749 }
 750
 751
 752 static int __devinit xpt2046_probe(struct spi_device *spi)
 753 {
 754         struct xpt2046                  *ts;
 755         struct xpt2046_packet           *packet;
 756         struct input_dev                *input_dev;
 757         struct xpt2046_platform_data    *pdata = spi->dev.platform_data;
 758         struct spi_message              *m;
 759         struct spi_transfer             *x;
 760         int                             vref;
 761         int                             err;
 762         int                             i;
 763
 764         if (!spi->irq) {
 765                 dev_dbg(&spi->dev, "no IRQ?\n");
 766                 return -ENODEV;
 767         }
 768         else{
 769                 spi->irq = gpio_to_irq(spi->irq);
 770                 dev_dbg(&spi->dev, "no IRQ?\n");
 771         }
 772
 773     if (!pdata) {
 774         dev_err(&spi->dev, "empty platform_data\n");
 775         return -EFAULT;
 776     }
 777
 778         /* don't exceed max specified sample rate */
 779         if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
 780                 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
 781                                 (spi->max_speed_hz/SAMPLE_BITS)/1000);
 782                 return -EINVAL;
 783         }
 784
 785         /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
 786          * that even if the hardware can do that, the SPI controller driver
 787          * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 788          */
 789         spi->bits_per_word = 8;
 790         spi->mode = SPI_MODE_0;
 791         err = spi_setup(spi);
 792         if (err < 0)
 793                 return err;
 794
 795         ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
 796         packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
 797         input_dev = input_allocate_device();
 798         if (!ts || !packet || !input_dev) {
 799                 err = -ENOMEM;
 800                 goto err_free_mem;
 801         }
 802
 803         dev_set_drvdata(&spi->dev, ts);
 804
 805         ts->packet = packet;
 806         ts->spi = spi;
 807         ts->input = input_dev;
 808         ts->swap_xy = pdata->swap_xy;
 809
 810         hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 811         ts->timer.function = xpt2046_timer;
 812
 813         spin_lock_init(&ts->lock);
 814
 815         ts->model = pdata->model ? : 2046;
 816
 817         if (pdata->filter != NULL) {
 818                 if (pdata->filter_init != NULL) {
 819                         err = pdata->filter_init(pdata, &ts->filter_data);
 820                         if (err < 0)
 821                                 goto err_free_mem;
 822                 }
 823                 ts->filter = pdata->filter;
 824                 ts->filter_cleanup = pdata->filter_cleanup;
 825         } else if (pdata->debounce_max) {
 826                 ts->debounce_max = pdata->debounce_max;
 827                 if (ts->debounce_max < pdata->debounce_rep)
 828                         ts->debounce_max = pdata->debounce_rep;
 829                 ts->debounce_tol = pdata->debounce_tol;
 830                 ts->debounce_rep = pdata->debounce_rep;
 831                 ts->filter = xpt2046_debounce;
 832                 ts->filter_data = ts;
 833         } else
 834                 ts->filter = xpt2046_no_filter;
 835
 836         err = setup_pendown(spi, ts);
 837         if (err)
 838                 goto err_cleanup_filter;
 839
 840         if (pdata->penirq_recheck_delay_usecs)
 841                 ts->penirq_recheck_delay_usecs =
 842                                 pdata->penirq_recheck_delay_usecs;
 843
 844         ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
 845
 846         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
 847         snprintf(ts->name, sizeof(ts->name), "XPT%d Touchscreen", ts->model);
 848
 849         input_dev->name = ts->name;
 850         input_dev->phys = ts->phys;
 851         input_dev->dev.parent = &spi->dev;
 852
 853         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 854         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 855         //add by zhao
 856         for (i = 0; i < ARRAY_SIZE(panel_key_info); i++)
 857                 set_bit(panel_key_info[i].key, input_dev->keybit);
 858         clear_bit(0, input_dev->keybit);
 859         //end
 860         input_set_abs_params(input_dev, ABS_X,
 861                         pdata->x_min ? : 0,
 862                         pdata->x_max ? : MAX_12BIT,
 863                         0, 0);
 864         input_set_abs_params(input_dev, ABS_Y,
 865                         pdata->y_min ? : 0,
 866                         pdata->y_max ? : MAX_12BIT,
 867                         0, 0);
 868
 869         vref = pdata->keep_vref_on;
 870
 871         /* set up the transfers to read touchscreen state; this assumes we
 872          * use formula #2 for pressure, not #3.
 873          */
 874         m = &ts->msg[0];
 875         x = ts->xfer;
 876
 877         spi_message_init(m);
 878
 879         /* y- still on; turn on only y+ (and ADC) */
 880         packet->read_y = READ_Y(vref);
 881         xpt2046printk("-------------read Y 0x%x\n",packet->read_y);     //add by zhao
 882         x->tx_buf = &packet->read_y;
 883         x->len = 1;
 884         spi_message_add_tail(x, m);
 885
 886         x++;
 887         x->rx_buf = &packet->tc.y;
 888         x->len = 2;
 889         spi_message_add_tail(x, m);
 890
 891         m->complete = xpt2046_rx_val;
 892         m->context = ts;
 893
 894         m++;
 895         spi_message_init(m);
 896
 897         /* turn y- off, x+ on, then leave in lowpower */
 898         x++;
 899         packet->read_x = READ_X(vref);
 900         xpt2046printk("-------------read X 0x%x\n",packet->read_x);     //add by zhao
 901         x->tx_buf = &packet->read_x;
 902         x->len = 1;
 903         spi_message_add_tail(x, m);
 904
 905         x++;
 906         x->rx_buf = &packet->tc.x;
 907         x->len = 2;
 908         spi_message_add_tail(x, m);
 909
 910         m->complete = xpt2046_rx_val;
 911         m->context = ts;
 912
 913         /* power down */
 914         m++;
 915         spi_message_init(m);
 916
 917         x++;
 918         packet->pwrdown = PWRDOWN;
 919         x->tx_buf = &packet->pwrdown;
 920         x->len = 1;
 921         spi_message_add_tail(x, m);
 922
 923         x++;
 924         x->rx_buf = &packet->dummy;
 925         x->len = 2;
 926         CS_CHANGE(*x);
 927         spi_message_add_tail(x, m);
 928
 929         m->complete = xpt2046_rx;
 930         m->context = ts;
 931
 932         ts->last_msg = m;
 933         xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
 934         if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
 935                         spi->dev.driver->name, ts)) {
 936                 printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
 937                 err = request_irq(spi->irq, xpt2046_irq,
 938                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 939                                   spi->dev.driver->name, ts);
 940                 if (err) {
 941                         dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
 942                         goto err_free_gpio;
 943                 }
 944         }
 945
 946         /* take a first sample, leaving nPENIRQ active and vREF off; avoid
 947          * the touchscreen, in case it's not connected.
 948          */
 949         xpt2046_read12_dfr(&spi->dev,READ_X(1));
 950
 951         err = input_register_device(input_dev);
 952         if (err)
 953                 goto err_remove_attr_group;
 954   printk("xpt2046_ts: driver initialized\n");
 955         return 0;
 956
 957  err_remove_attr_group:
 958         free_irq(spi->irq, ts);
 959  err_free_gpio:
 960         if (ts->gpio_pendown != -1)
 961                 gpio_free(ts->gpio_pendown);
 962  err_cleanup_filter:
 963         if (ts->filter_cleanup)
 964                 ts->filter_cleanup(ts->filter_data);
 965  err_free_mem:
 966         input_free_device(input_dev);
 967         kfree(packet);
 968         kfree(ts);
 969         return err;
 970 }
 971
 972 static int __devexit xpt2046_remove(struct spi_device *spi)
 973 {
 974         struct xpt2046          *ts = dev_get_drvdata(&spi->dev);
 975
 976         input_unregister_device(ts->input);
 977
 978         xpt2046_suspend(spi, PMSG_SUSPEND);
 979
 980         free_irq(ts->spi->irq, ts);
 981         /* suspend left the IRQ disabled */
 982         enable_irq(ts->spi->irq);
 983
 984         if (ts->gpio_pendown != -1)
 985                 gpio_free(ts->gpio_pendown);
 986
 987         if (ts->filter_cleanup)
 988                 ts->filter_cleanup(ts->filter_data);
 989
 990         kfree(ts->packet);
 991         kfree(ts);
 992
 993         dev_dbg(&spi->dev, "unregistered touchscreen\n");
 994         return 0;
 995 }
 996
 997 static struct spi_driver xpt2046_driver = {
 998         .driver = {
 999                 .name   = "xpt2046_ts",
1000                 .bus    = &spi_bus_type,
1001                 .owner  = THIS_MODULE,
1002         },
1003         .probe          = xpt2046_probe,
1004         .remove         = __devexit_p(xpt2046_remove),
1005         .suspend        = xpt2046_suspend,
1006         .resume         = xpt2046_resume,
1007 };
1008
1009 static int __init xpt2046_init(void)
1010 {
1011         return spi_register_driver(&xpt2046_driver);
1012 }
1013 module_init(xpt2046_init);
1014
1015 static void __exit xpt2046_exit(void)
1016 {
1017         spi_unregister_driver(&xpt2046_driver);
1018 }
1019 module_exit(xpt2046_exit);
1020
1021 MODULE_DESCRIPTION("rk2818 spi xpt2046 TouchScreen Driver");
1022 MODULE_LICENSE("GPL");
1023 MODULE_ALIAS("spi:xpt2046");