drivers/input/touchscreen/xpt2046_cbn_ts.c

   1 /*
   2  * drivers/input/touchscreen/xpt2046_ts.c - driver for rk29 spi xpt2046 device and console
   3  *
   4  * Copyright (C) 2011 ROCKCHIP, Inc.
   5  *
   6  * This software is licensed under the terms of the GNU General Public
   7  * License version 2, as published by the Free Software Foundation, and
   8  * may be copied, distributed, and modified under those terms.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/hwmon.h>
  17 #include <linux/init.h>
  18 #include <linux/err.h>
  19 #include <linux/delay.h>
  20 #include <linux/input.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/slab.h>
  23 #include <linux/gpio.h>
  24 #include <linux/spi/spi.h>
  25 #include <asm/irq.h>
  26 #include <mach/iomux.h>
  27 #ifdef CONFIG_HAS_EARLYSUSPEND
  28 #include <linux/earlysuspend.h>
  29 #endif
  30 #include "xpt2046_cbn_ts.h"
  31 #include "calibration_ts.h"
  32 /*
  33  * This code has been heavily tested on a Nokia 770, and lightly
  34  * tested on other xpt2046 devices (OSK/Mistral, Lubbock).
  35  * TSC2046 is just newer xpt2046 silicon.
  36  * Support for ads7843 tested on Atmel at91sam926x-EK.
  37  * Support for ads7845 has only been stubbed in.
  38  *
  39  * IRQ handling needs a workaround because of a shortcoming in handling
  40  * edge triggered IRQs on some platforms like the OMAP1/2. These
  41  * platforms don't handle the ARM lazy IRQ disabling properly, thus we
  42  * have to maintain our own SW IRQ disabled status. This should be
  43  * removed as soon as the affected platform's IRQ handling is fixed.
  44  *
  45  * app note sbaa036 talks in more detail about accurate sampling...
  46  * that ought to help in situations like LCDs inducing noise (which
  47  * can also be helped by using synch signals) and more generally.
  48  * This driver tries to utilize the measures described in the app
  49  * note. The strength of filtering can be set in the board-* specific
  50  * files.
  51  */
  52 #define XPT2046_DEBUG                   0
  53 #if XPT2046_DEBUG
  54         #define xpt2046printk(msg...)   printk(msg);
  55 #else
  56         #define xpt2046printk(msg...)
  57 #endif
  58
  59 #define TS_POLL_DELAY   (10 * 1000000)  /* ns delay before the first sample */
  60 #define TS_POLL_PERIOD  (20 * 1000000)  /* ns delay between samples */
  61
  62 /* this driver doesn't aim at the peak continuous sample rate */
  63 #define SAMPLE_BITS     (8 /*cmd*/ + 16 /*sample*/ + 2 /* before, after */)
  64
  65 struct ts_event {
  66         /* For portability, we can't read 12 bit values using SPI (which
  67          * would make the controller deliver them as native byteorder u16
  68          * with msbs zeroed).  Instead, we read them as two 8-bit values,
  69          * *** WHICH NEED BYTESWAPPING *** and range adjustment.
  70          */
  71         u16     x;
  72         u16     y;
  73         int     ignore;
  74 };
  75
  76 /*
  77  * We allocate this separately to avoid cache line sharing issues when
  78  * driver is used with DMA-based SPI controllers (like atmel_spi) on
  79  * systems where main memory is not DMA-coherent (most non-x86 boards).
  80  */
  81 struct xpt2046_packet {
  82         u8                      read_x, read_y, pwrdown;
  83         u16                     dummy;          /* for the pwrdown read */
  84         struct ts_event         tc;
  85 };
  86
  87 struct xpt2046 {
  88         struct input_dev        *input;
  89         char    phys[32];
  90         char    name[32];
  91         char    pendown_iomux_name[IOMUX_NAME_SIZE];
  92         struct spi_device       *spi;
  93
  94         u16             model;
  95         u16             x_min, x_max;
  96         u16             y_min, y_max;
  97         u16             debounce_max;
  98         u16             debounce_tol;
  99         u16             debounce_rep;
 100         u16             penirq_recheck_delay_usecs;
 101         bool    swap_xy;
 102
 103         struct xpt2046_packet   *packet;
 104
 105         struct spi_transfer     xfer[18];
 106         struct spi_message      msg[5];
 107         struct spi_message      *last_msg;
 108         int             msg_idx;
 109         int             read_cnt;
 110         int             read_rep;
 111         int             last_read;
 112         int             pendown_iomux_mode;
 113         int     touch_virtualkey_length;
 114         spinlock_t              lock;
 115         struct hrtimer  timer;
 116         unsigned                pendown:1;      /* P: lock */
 117         unsigned                pending:1;      /* P: lock */
 118 // FIXME remove "irq_disabled"
 119         unsigned                irq_disabled:1; /* P: lock */
 120         unsigned                disabled:1;
 121         unsigned                is_suspended:1;
 122
 123         int                     (*filter)(void *data, int data_idx, int *val);
 124         void            *filter_data;
 125         void            (*filter_cleanup)(void *data);
 126         int                     (*get_pendown_state)(void);
 127         int                     gpio_pendown;
 128
 129         void            (*wait_for_sync)(void);
 130 #ifdef CONFIG_HAS_EARLYSUSPEND
 131         struct early_suspend early_suspend;
 132 #endif
 133 };
 134
 135 /* leave chip selected when we're done, for quicker re-select? */
 136 #if     0
 137 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
 138 #else
 139 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
 140 #endif
 141
 142 /*--------------------------------------------------------------------------*/
 143
 144 /* The xpt2046 has touchscreen and other sensors.
 145  * Earlier xpt2046 chips are somewhat compatible.
 146  */
 147 #define XPT2046_START                   (1 << 7)
 148 #define XPT2046_A2A1A0_d_y              (1 << 4)        /* differential */
 149 #define XPT2046_A2A1A0_d_z1             (3 << 4)        /* differential */
 150 #define XPT2046_A2A1A0_d_z2             (4 << 4)        /* differential */
 151 #define XPT2046_A2A1A0_d_x              (5 << 4)        /* differential */
 152 #define XPT2046_A2A1A0_temp0    (0 << 4)        /* non-differential */
 153 #define XPT2046_A2A1A0_vbatt    (2 << 4)        /* non-differential */
 154 #define XPT2046_A2A1A0_vaux             (6 << 4)        /* non-differential */
 155 #define XPT2046_A2A1A0_temp1    (7 << 4)        /* non-differential */
 156 #define XPT2046_8_BIT                   (1 << 3)
 157 #define XPT2046_12_BIT                  (0 << 3)
 158 #define XPT2046_SER                             (1 << 2)        /* non-differential */
 159 #define XPT2046_DFR                             (0 << 2)        /* differential */
 160 #define XPT2046_PD10_PDOWN              (0 << 0)        /* lowpower mode + penirq */
 161 #define XPT2046_PD10_ADC_ON             (1 << 0)        /* ADC on */
 162 #define XPT2046_PD10_REF_ON             (2 << 0)        /* vREF on + penirq */
 163 #define XPT2046_PD10_ALL_ON             (3 << 0)        /* ADC + vREF on */
 164
 165 #define MAX_12BIT       ((1<<12)-1)
 166
 167 /* leave ADC powered up (disables penirq) between differential samples */
 168 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
 169         | XPT2046_12_BIT | XPT2046_DFR | \
 170         (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
 171
 172 #define READ_Y(vref)    (READ_12BIT_DFR(y,  1, vref))
 173 #define READ_Z1(vref)   (READ_12BIT_DFR(z1, 1, vref))
 174 #define READ_Z2(vref)   (READ_12BIT_DFR(z2, 1, vref))
 175
 176 #define READ_X(vref)    (READ_12BIT_DFR(x,  1, vref))
 177 #define PWRDOWN         (READ_12BIT_DFR(y,  0, 0))      /* LAST */
 178
 179 /* single-ended samples need to first power up reference voltage;
 180  * we leave both ADC and VREF powered
 181  */
 182 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
 183         | XPT2046_12_BIT | XPT2046_SER)
 184
 185 #define REF_ON  (READ_12BIT_DFR(x, 1, 1))
 186 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
 187
 188 /*--------------------------------------------------------------------------*/
 189 /*
 190  * touchscreen sensors  use differential conversions.
 191  */
 192
 193 struct dfr_req {
 194         u8                      command;
 195         u8                      pwrdown;
 196         u16                     dummy;          /* for the pwrdown read */
 197         __be16                  sample;
 198         struct spi_message      msg;
 199         struct spi_transfer     xfer[4];
 200 };
 201
 202 volatile struct adc_point gADPoint;
 203
 204 static void xpt2046_enable(struct xpt2046 *ts);
 205 static void xpt2046_disable(struct xpt2046 *ts);
 206 static int xpt2046_verifyAndConvert(struct xpt2046 *ts,int adx, int ady,int *x, int *y)
 207 {
 208         xpt2046printk("%s:(%d/%d)\n",__FUNCTION__,*x, *y);
 209
 210         if((*x< ts->x_min) || (*x > ts->x_max))
 211                 return 1;
 212
 213         if((*y< ts->y_min) || (*y > ts->y_max + ts->touch_virtualkey_length))
 214                 return 1;
 215
 216
 217         return 0;
 218 }
 219 static int device_suspended(struct device *dev)
 220 {
 221         struct xpt2046 *ts = dev_get_drvdata(dev);
 222         return ts->is_suspended || ts->disabled;
 223 }
 224
 225 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
 226 {
 227         struct spi_device       *spi = to_spi_device(dev);
 228         struct xpt2046          *ts = dev_get_drvdata(dev);
 229         struct dfr_req          *req = kzalloc(sizeof *req, GFP_KERNEL);
 230         int                     status;
 231
 232         if (!req)
 233                 return -ENOMEM;
 234
 235         spi_message_init(&req->msg);
 236
 237         /* take sample */
 238         req->command = (u8) command;
 239         req->xfer[0].tx_buf = &req->command;
 240         req->xfer[0].len = 1;
 241         spi_message_add_tail(&req->xfer[0], &req->msg);
 242
 243         req->xfer[1].rx_buf = &req->sample;
 244         req->xfer[1].len = 2;
 245         spi_message_add_tail(&req->xfer[1], &req->msg);
 246
 247         /* converter in low power mode & enable PENIRQ */
 248         req->pwrdown= PWRDOWN;
 249         req->xfer[2].tx_buf = &req->pwrdown;
 250         req->xfer[2].len = 1;
 251         spi_message_add_tail(&req->xfer[2], &req->msg);
 252
 253         req->xfer[3].rx_buf = &req->dummy;
 254         req->xfer[3].len = 2;
 255         CS_CHANGE(req->xfer[3]);
 256         spi_message_add_tail(&req->xfer[3], &req->msg);
 257
 258         ts->irq_disabled = 1;
 259         disable_irq(spi->irq);
 260         status = spi_sync(spi, &req->msg);
 261         ts->irq_disabled = 0;
 262         enable_irq(spi->irq);
 263
 264         if (status == 0) {
 265                 /* on-wire is a must-ignore bit, a BE12 value, then padding */
 266                 status = be16_to_cpu(req->sample);
 267                 status = status >> 3;
 268                 status &= 0x0fff;
 269                 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
 270         }
 271
 272         kfree(req);
 273         return status;
 274 }
 275
 276
 277
 278 /*--------------------------------------------------------------------------*/
 279
 280 static int get_pendown_state(struct xpt2046 *ts)
 281 {
 282         if (ts->get_pendown_state)
 283                 return ts->get_pendown_state();
 284
 285         return !gpio_get_value(ts->gpio_pendown);
 286 }
 287
 288 static void null_wait_for_sync(void)
 289 {
 290
 291 }
 292
 293 /*
 294  * PENIRQ only kicks the timer.  The timer only reissues the SPI transfer,
 295  * to retrieve touchscreen status.
 296  *
 297  * The SPI transfer completion callback does the real work.  It reports
 298  * touchscreen events and reactivates the timer (or IRQ) as appropriate.
 299  */
 300 static void xpt2046_rx(void *xpt)
 301 {
 302         struct xpt2046          *ts = xpt;
 303         struct xpt2046_packet   *packet = ts->packet;
 304         unsigned                Rt = 1;
 305         u16                     x, y;
 306         int             cal_x,cal_y;
 307         /* xpt2046_rx_val() did in-place conversion (including byteswap) from
 308          * on-the-wire format as part of debouncing to get stable readings.
 309          */
 310         x = packet->tc.x;
 311         y = packet->tc.y;
 312
 313         xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
 314
 315         /* range filtering */
 316         if (x == MAX_12BIT)
 317                 x = 0;
 318
 319         /* Sample found inconsistent by debouncing or pressure is beyond
 320          * the maximum. Don't report it to user space, repeat at least
 321          * once more the measurement
 322          */
 323         if (packet->tc.ignore) {
 324
 325                 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
 326
 327                 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 328                               HRTIMER_MODE_REL);
 329                 return;
 330         }
 331
 332         /* Maybe check the pendown state before reporting. This discards
 333          * false readings when the pen is lifted.
 334          */
 335         if (ts->penirq_recheck_delay_usecs) {
 336                 udelay(ts->penirq_recheck_delay_usecs);
 337                 if (!get_pendown_state(ts))
 338                 {
 339                         xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
 340                         Rt = 0;
 341                 }
 342         }
 343
 344         /* NOTE: We can't rely on the pressure to determine the pen down
 345          * state, even this controller has a pressure sensor.  The pressure
 346          * value can fluctuate for quite a while after lifting the pen and
 347          * in some cases may not even settle at the expected value.
 348          *
 349          * The only safe way to check for the pen up condition is in the
 350          * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 351          */
 352         if (Rt) {
 353                 struct input_dev *input = ts->input;
 354
 355                 TouchPanelCalibrateAPoint(x, y, &cal_x, &cal_y);
 356
 357         cal_x = cal_x / 4;
 358         cal_y = cal_y / 4;
 359                 gADPoint.x = x;
 360         gADPoint.y = y;
 361
 362                 if (ts->swap_xy)
 363                         swap(cal_x, cal_y);
 364
 365                 if(xpt2046_verifyAndConvert(ts,cal_x,cal_y,&cal_x,&cal_y))
 366                 {
 367                         xpt2046printk("***>%s:xpt2046_verifyAndConvert fail\n",__FUNCTION__);
 368                         goto out;
 369                 }
 370
 371                 if (!ts->pendown) {
 372                         input_report_key(input, BTN_TOUCH, 1);
 373                         ts->pendown = 1;
 374                         xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 375                 }
 376
 377                 input_report_abs(input, ABS_X, cal_x);
 378                 input_report_abs(input, ABS_Y, cal_y);
 379
 380                 input_sync(input);
 381                 xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,cal_x, cal_y);
 382         }
 383 out:
 384         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 385                         HRTIMER_MODE_REL);
 386 }
 387
 388 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
 389 {
 390         struct xpt2046          *ts = xpt;
 391         static int average_val[2];
 392
 393
 394         xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
 395                 data_idx,ts->last_read,
 396           ts->read_cnt,ts->debounce_max,
 397                 abs(ts->last_read - *val),ts->debounce_tol,
 398                 ts->read_rep,ts->debounce_rep);
 399
 400         /* discard the first sample. */
 401          //on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
 402         if(!ts->read_cnt)
 403         {
 404                 //udelay(100);
 405                 ts->read_cnt++;
 406                 return XPT2046_FILTER_REPEAT;
 407         }
 408         if(*val == 4095 || *val == 0)
 409         {
 410                 ts->read_cnt = 0;
 411                 ts->last_read = 0;
 412                 memset(average_val,0,sizeof(average_val));
 413                 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
 414                 return XPT2046_FILTER_IGNORE;
 415         }
 416
 417
 418         if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
 419                 /* Start over collecting consistent readings. */
 420                 ts->read_rep = 1;
 421                 average_val[data_idx] = *val;
 422                 /* Repeat it, if this was the first read or the read
 423                  * wasn't consistent enough. */
 424                 if (ts->read_cnt < ts->debounce_max) {
 425                         ts->last_read = *val;
 426                         ts->read_cnt++;
 427                         return XPT2046_FILTER_REPEAT;
 428                 } else {
 429                         /* Maximum number of debouncing reached and still
 430                          * not enough number of consistent readings. Abort
 431                          * the whole sample, repeat it in the next sampling
 432                          * period.
 433                          */
 434                         ts->read_cnt = 0;
 435                         ts->last_read = 0;
 436                         memset(average_val,0,sizeof(average_val));
 437                         xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
 438                         return XPT2046_FILTER_IGNORE;
 439                 }
 440         }
 441         else {
 442                 average_val[data_idx] += *val;
 443
 444                 if (++ts->read_rep >= ts->debounce_rep) {
 445                         /* Got a good reading for this coordinate,
 446                          * go for the next one. */
 447                         ts->read_cnt = 0;
 448                         ts->read_rep = 0;
 449                         ts->last_read = 0;
 450                         *val = average_val[data_idx]/(ts->debounce_rep);
 451                         return XPT2046_FILTER_OK;
 452                 } else {
 453                         /* Read more values that are consistent. */
 454                         ts->read_cnt++;
 455
 456                         return XPT2046_FILTER_REPEAT;
 457                 }
 458         }
 459 }
 460
 461 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
 462 {
 463         return XPT2046_FILTER_OK;
 464 }
 465
 466 static void xpt2046_rx_val(void *xpt)
 467 {
 468         struct xpt2046 *ts = xpt;
 469         struct xpt2046_packet *packet = ts->packet;
 470         struct spi_message *m;
 471         struct spi_transfer *t;
 472         int val;
 473         int action;
 474         int status;
 475
 476         m = &ts->msg[ts->msg_idx];
 477         t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 478
 479         /* adjust:  on-wire is a must-ignore bit, a BE12 value, then padding;
 480          * built from two 8 bit values written msb-first.
 481          */
 482         val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
 483
 484         xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
 485
 486         action = ts->filter(ts->filter_data, ts->msg_idx, &val);
 487         switch (action) {
 488         case XPT2046_FILTER_REPEAT:
 489                 break;
 490         case XPT2046_FILTER_IGNORE:
 491                 packet->tc.ignore = 1;
 492                 /* Last message will contain xpt2046_rx() as the
 493                  * completion function.
 494                  */
 495                 m = ts->last_msg;
 496                 break;
 497         case XPT2046_FILTER_OK:
 498                 *(u16 *)t->rx_buf = val;
 499                 packet->tc.ignore = 0;
 500                 m = &ts->msg[++ts->msg_idx];
 501                 break;
 502         default:
 503                 BUG();
 504         }
 505         ts->wait_for_sync();
 506         status = spi_async(ts->spi, m);
 507         if (status)
 508                 dev_err(&ts->spi->dev, "spi_async --> %d\n",
 509                                 status);
 510 }
 511
 512 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
 513 {
 514         struct xpt2046  *ts = container_of(handle, struct xpt2046, timer);
 515         int             status = 0;
 516
 517         spin_lock(&ts->lock);
 518
 519         if (unlikely(!get_pendown_state(ts) ||
 520                      device_suspended(&ts->spi->dev))) {
 521                 if (ts->pendown) {
 522                         struct input_dev *input = ts->input;
 523                         input_report_key(input, BTN_TOUCH, 0);
 524                         input_sync(input);
 525
 526                         ts->pendown = 0;
 527
 528                         xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
 529                 }
 530
 531                 /* measurement cycle ended */
 532                 if (!device_suspended(&ts->spi->dev)) {
 533                         xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
 534                         ts->irq_disabled = 0;
 535                         enable_irq(ts->spi->irq);
 536                 }
 537                 ts->pending = 0;
 538         } else {
 539                 /* pen is still down, continue with the measurement */
 540                 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
 541                 ts->msg_idx = 0;
 542                 ts->wait_for_sync();
 543                 status = spi_async(ts->spi, &ts->msg[0]);
 544                 if (status)
 545                         dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
 546         }
 547
 548         spin_unlock(&ts->lock);
 549         return HRTIMER_NORESTART;
 550 }
 551
 552 static irqreturn_t xpt2046_irq(int irq, void *handle)
 553 {
 554         struct xpt2046 *ts = handle;
 555         unsigned long flags;
 556
 557         xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
 558
 559         spin_lock_irqsave(&ts->lock, flags);
 560
 561         if (likely(get_pendown_state(ts))) {
 562                 if (!ts->irq_disabled) {
 563                         /* The ARM do_simple_IRQ() dispatcher doesn't act
 564                          * like the other dispatchers:  it will report IRQs
 565                          * even after they've been disabled.  We work around
 566                          * that here.  (The "generic irq" framework may help...)
 567                          */
 568                         ts->irq_disabled = 1;
 569                         disable_irq_nosync(ts->spi->irq);
 570                         ts->pending = 1;
 571                         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
 572                                         HRTIMER_MODE_REL);
 573                 }
 574         }
 575         spin_unlock_irqrestore(&ts->lock, flags);
 576
 577         return IRQ_HANDLED;
 578 }
 579
 580 /*--------------------------------------------------------------------------*/
 581
 582 /* Must be called with ts->lock held */
 583 static void xpt2046_disable(struct xpt2046 *ts)
 584 {
 585         if (ts->disabled)
 586                 return;
 587
 588         ts->disabled = 1;
 589
 590         /* are we waiting for IRQ, or polling? */
 591         if (!ts->pending) {
 592                 ts->irq_disabled = 1;
 593                 disable_irq(ts->spi->irq);
 594         } else {
 595                 /* the timer will run at least once more, and
 596                  * leave everything in a clean state, IRQ disabled
 597                  */
 598                 while (ts->pending) {
 599                         spin_unlock_irq(&ts->lock);
 600                         msleep(1);
 601                         spin_lock_irq(&ts->lock);
 602                 }
 603         }
 604
 605         /* we know the chip's in lowpower mode since we always
 606          * leave it that way after every request
 607          */
 608 }
 609
 610 /* Must be called with ts->lock held */
 611 static void xpt2046_enable(struct xpt2046 *ts)
 612 {
 613         if (!ts->disabled)
 614                 return;
 615
 616         ts->disabled = 0;
 617         ts->irq_disabled = 0;
 618         enable_irq(ts->spi->irq);
 619 }
 620
 621 static int xpt2046_pSuspend(struct xpt2046 *ts)
 622 {
 623         spin_lock_irq(&ts->lock);
 624
 625         ts->is_suspended = 1;
 626         xpt2046_disable(ts);
 627
 628         spin_unlock_irq(&ts->lock);
 629
 630         return 0;
 631 }
 632
 633 static int xpt2046_pResume(struct xpt2046 *ts)
 634 {
 635         spin_lock_irq(&ts->lock);
 636
 637         ts->is_suspended = 0;
 638         xpt2046_enable(ts);
 639
 640         spin_unlock_irq(&ts->lock);
 641
 642         return 0;
 643 }
 644
 645 #if !defined(CONFIG_HAS_EARLYSUSPEND)
 646 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
 647 {
 648         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 649
 650         printk("xpt2046_suspend\n");
 651
 652         xpt2046_pSuspend(ts);
 653
 654         return 0;
 655 }
 656
 657 static int xpt2046_resume(struct spi_device *spi)
 658 {
 659         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 660
 661         printk("xpt2046_resume\n");
 662
 663         xpt2046_pResume(ts);
 664
 665         return 0;
 666 }
 667
 668 #elif defined(CONFIG_HAS_EARLYSUSPEND)
 669 static void xpt2046_early_suspend(struct early_suspend *h)
 670 {
 671         struct xpt2046  *ts;
 672     ts = container_of(h, struct xpt2046, early_suspend);
 673
 674         printk("xpt2046_suspend early\n");
 675
 676         xpt2046_pSuspend(ts);
 677
 678         return;
 679 }
 680
 681 static void xpt2046_late_resume(struct early_suspend *h)
 682 {
 683         struct xpt2046  *ts;
 684     ts = container_of(h, struct xpt2046, early_suspend);
 685
 686         printk("xpt2046_resume late\n");
 687
 688         xpt2046_pResume(ts);
 689
 690         return;
 691 }
 692 #endif
 693
 694 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
 695 {
 696         struct xpt2046_platform_data *pdata = spi->dev.platform_data;
 697         int err;
 698
 699         /* REVISIT when the irq can be triggered active-low, or if for some
 700          * reason the touchscreen isn't hooked up, we don't need to access
 701          * the pendown state.
 702          */
 703         if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
 704                 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
 705                 return -EINVAL;
 706         }
 707
 708         if (pdata->get_pendown_state) {
 709                 ts->get_pendown_state = pdata->get_pendown_state;
 710                 return 0;
 711         }
 712
 713     if (pdata->io_init) {
 714         err = pdata->io_init();
 715         if (err)
 716             dev_err(&spi->dev, "xpt2046 io_init fail\n");
 717     }
 718
 719         ts->gpio_pendown = pdata->gpio_pendown;
 720         strcpy(ts->pendown_iomux_name,pdata->pendown_iomux_name);
 721         ts->pendown_iomux_mode = pdata->pendown_iomux_mode;
 722
 723     rk29_mux_api_set(ts->pendown_iomux_name,pdata->pendown_iomux_mode);
 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_pull_updown(pdata->gpio_pendown, GPIOPullUp);
 732         if (err) {
 733                 dev_err(&spi->dev, "failed to pullup pendown GPIO%d\n",
 734                                 pdata->gpio_pendown);
 735                 return err;
 736         }
 737         ts->gpio_pendown = pdata->gpio_pendown;
 738         return 0;
 739 }
 740
 741 static int __devinit xpt2046_probe(struct spi_device *spi)
 742 {
 743         struct xpt2046                  *ts;
 744         struct xpt2046_packet           *packet;
 745         struct input_dev                *input_dev;
 746         struct xpt2046_platform_data    *pdata = spi->dev.platform_data;
 747         struct spi_message              *m;
 748         struct spi_transfer             *x;
 749         int                             vref;
 750         int                             err;
 751
 752         if (!spi->irq) {
 753                 dev_dbg(&spi->dev, "no IRQ?\n");
 754                 return -ENODEV;
 755         }
 756         else{
 757                 spi->irq = gpio_to_irq(spi->irq);
 758                 dev_dbg(&spi->dev, "no IRQ?\n");
 759         }
 760
 761     if (!pdata) {
 762                 dev_err(&spi->dev, "empty platform_data\n");
 763                 return -EFAULT;
 764     }
 765
 766         /* don't exceed max specified sample rate */
 767         if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
 768                 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
 769                                 (spi->max_speed_hz/SAMPLE_BITS)/1000);
 770                 return -EINVAL;
 771         }
 772
 773         /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
 774          * that even if the hardware can do that, the SPI controller driver
 775          * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 776          */
 777         spi->bits_per_word = 8;
 778         spi->mode = SPI_MODE_0;
 779         err = spi_setup(spi);
 780         if (err < 0)
 781                 return err;
 782
 783         ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
 784         packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
 785         input_dev = input_allocate_device();
 786         if (!ts || !packet || !input_dev) {
 787                 err = -ENOMEM;
 788                 goto err_free_mem;
 789         }
 790
 791         dev_set_drvdata(&spi->dev, ts);
 792
 793         ts->packet = packet;
 794         ts->spi = spi;
 795         ts->input = input_dev;
 796         ts->swap_xy = pdata->swap_xy;
 797
 798         hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 799         ts->timer.function = xpt2046_timer;
 800
 801         spin_lock_init(&ts->lock);
 802
 803         ts->model = pdata->model ? : 2046;
 804
 805         if (pdata->filter != NULL) {
 806                 if (pdata->filter_init != NULL) {
 807                         err = pdata->filter_init(pdata, &ts->filter_data);
 808                         if (err < 0)
 809                                 goto err_free_mem;
 810                 }
 811                 ts->filter = pdata->filter;
 812                 ts->filter_cleanup = pdata->filter_cleanup;
 813         } else if (pdata->debounce_max) {
 814                 ts->debounce_max = pdata->debounce_max;
 815                 if (ts->debounce_max < pdata->debounce_rep)
 816                         ts->debounce_max = pdata->debounce_rep;
 817                 ts->debounce_tol = pdata->debounce_tol;
 818                 ts->debounce_rep = pdata->debounce_rep;
 819                 ts->filter = xpt2046_debounce;
 820                 ts->filter_data = ts;
 821         } else
 822                 ts->filter = xpt2046_no_filter;
 823
 824         err = setup_pendown(spi, ts);
 825         if (err)
 826                 goto err_cleanup_filter;
 827
 828         if (pdata->penirq_recheck_delay_usecs)
 829                 ts->penirq_recheck_delay_usecs =
 830                                 pdata->penirq_recheck_delay_usecs;
 831
 832         ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
 833         ts->x_min = pdata->x_min;
 834         ts->x_max = pdata->x_max;
 835         ts->y_min = pdata->y_min;
 836         ts->y_max = pdata->y_max;
 837
 838
 839         ts->touch_virtualkey_length = pdata->touch_virtualkey_length;
 840
 841         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
 842         snprintf(ts->name, sizeof(ts->name), "xpt%d-touchscreen", ts->model);
 843
 844         input_dev->name = ts->name;
 845         input_dev->phys = ts->phys;
 846         input_dev->dev.parent = &spi->dev;
 847
 848         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 849         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 850         input_set_abs_params(input_dev, ABS_X,
 851                         ts->x_min ? : 0,
 852                         ts->x_max ? : MAX_12BIT,
 853                         0, 0);
 854         input_set_abs_params(input_dev, ABS_Y,
 855                         ts->y_min ? : 0,
 856                         ts->y_max ? : MAX_12BIT,
 857                         0, 0);
 858
 859         vref = pdata->keep_vref_on;
 860
 861         tp_calib_iface_init(pdata->screen_x,pdata->screen_y,pdata->uncali_x_default,pdata->uncali_y_default);
 862         /* set up the transfers to read touchscreen state; this assumes we
 863          * use formula #2 for pressure, not #3.
 864          */
 865         m = &ts->msg[0];
 866         x = ts->xfer;
 867
 868         spi_message_init(m);
 869
 870         /* y- still on; turn on only y+ (and ADC) */
 871         packet->read_y = READ_Y(vref);
 872         x->tx_buf = &packet->read_y;
 873         x->len = 1;
 874         spi_message_add_tail(x, m);
 875
 876         x++;
 877         x->rx_buf = &packet->tc.y;
 878         x->len = 2;
 879         spi_message_add_tail(x, m);
 880
 881         m->complete = xpt2046_rx_val;
 882         m->context = ts;
 883
 884         m++;
 885         spi_message_init(m);
 886
 887         /* turn y- off, x+ on, then leave in lowpower */
 888         x++;
 889         packet->read_x = READ_X(vref);
 890         x->tx_buf = &packet->read_x;
 891         x->len = 1;
 892         spi_message_add_tail(x, m);
 893
 894         x++;
 895         x->rx_buf = &packet->tc.x;
 896         x->len = 2;
 897         spi_message_add_tail(x, m);
 898
 899         m->complete = xpt2046_rx_val;
 900         m->context = ts;
 901
 902         /* power down */
 903         m++;
 904         spi_message_init(m);
 905
 906         x++;
 907         packet->pwrdown = PWRDOWN;
 908         x->tx_buf = &packet->pwrdown;
 909         x->len = 1;
 910         spi_message_add_tail(x, m);
 911
 912         x++;
 913         x->rx_buf = &packet->dummy;
 914         x->len = 2;
 915         CS_CHANGE(*x);
 916         spi_message_add_tail(x, m);
 917
 918         m->complete = xpt2046_rx;
 919         m->context = ts;
 920
 921         ts->last_msg = m;
 922
 923         if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
 924                         spi->dev.driver->name, ts)) {
 925                 xpt2046printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
 926                 err = request_irq(spi->irq, xpt2046_irq,
 927                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 928                                   spi->dev.driver->name, ts);
 929                 if (err) {
 930                         dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
 931                         goto err_free_gpio;
 932                 }
 933         }
 934         xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
 935
 936         /* take a first sample, leaving nPENIRQ active and vREF off; avoid
 937          * the touchscreen, in case it's not connected.
 938          */
 939         xpt2046_read12_dfr(&spi->dev,READ_X(1));
 940
 941         err = input_register_device(input_dev);
 942         if (err)
 943                 goto err_remove_attr_group;
 944
 945 #ifdef CONFIG_HAS_EARLYSUSPEND
 946         ts->early_suspend.suspend = xpt2046_early_suspend;
 947         ts->early_suspend.resume = xpt2046_late_resume;
 948         ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
 949         register_early_suspend(&ts->early_suspend);
 950 #endif
 951
 952     xpt2046printk("xpt2046_ts: driver initialized\n");
 953         return 0;
 954
 955  err_remove_attr_group:
 956         free_irq(spi->irq, ts);
 957  err_free_gpio:
 958         if (ts->gpio_pendown != -1)
 959                 gpio_free(ts->gpio_pendown);
 960  err_cleanup_filter:
 961         if (ts->filter_cleanup)
 962                 ts->filter_cleanup(ts->filter_data);
 963  err_free_mem:
 964         input_free_device(input_dev);
 965         kfree(packet);
 966         kfree(ts);
 967         return err;
 968 }
 969
 970
 971 static int __devexit xpt2046_remove(struct spi_device *spi)
 972 {
 973         struct xpt2046          *ts = dev_get_drvdata(&spi->dev);
 974
 975         input_unregister_device(ts->input);
 976
 977 #if !defined(CONFIG_HAS_EARLYSUSPEND)
 978         xpt2046_suspend(spi, PMSG_SUSPEND);
 979 #elif defined(CONFIG_HAS_EARLYSUSPEND)
 980         xpt2046_early_suspend(&ts->early_suspend);
 981         unregister_early_suspend(&ts->early_suspend);
 982 #endif
 983
 984         free_irq(ts->spi->irq, ts);
 985         /* suspend left the IRQ disabled */
 986         enable_irq(ts->spi->irq);
 987
 988         if (ts->gpio_pendown != -1)
 989                 gpio_free(ts->gpio_pendown);
 990
 991         if (ts->filter_cleanup)
 992                 ts->filter_cleanup(ts->filter_data);
 993
 994         kfree(ts->packet);
 995         kfree(ts);
 996
 997         tp_calib_iface_exit();
 998
 999         dev_dbg(&spi->dev, "unregistered touchscreen\n");
1000         return 0;
1001 }
1002
1003 static struct spi_driver xpt2046_driver = {
1004         .driver = {
1005                 .name   = "xpt2046_ts",
1006                 .bus    = &spi_bus_type,
1007                 .owner  = THIS_MODULE,
1008         },
1009         .probe          = xpt2046_probe,
1010         .remove         = __devexit_p(xpt2046_remove),
1011 #ifndef CONFIG_HAS_EARLYSUSPEND
1012         .suspend        = xpt2046_suspend,
1013         .resume         = xpt2046_resume,
1014 #endif
1015 };
1016
1017 static int __init xpt2046_init(void)
1018 {
1019         int ret;
1020         gADPoint.x = 0;
1021         gADPoint.y = 0;
1022
1023         xpt2046printk("Touch panel drive XPT2046 driver init...\n");
1024         ret = spi_register_driver(&xpt2046_driver);
1025     if (ret)
1026     {
1027                 printk("Register XPT2046 driver failed.\n");
1028             return ret;
1029         }
1030
1031         return 0;
1032
1033 }
1034
1035
1036 static void __exit xpt2046_exit(void)
1037 {
1038         xpt2046printk("Touch panel drive XPT2046 driver exit...\n");
1039         spi_unregister_driver(&xpt2046_driver);
1040 }
1041 module_init(xpt2046_init);
1042 module_exit(xpt2046_exit);
1043
1044 MODULE_DESCRIPTION("rk29xx spi xpt2046 TouchScreen Driver");
1045 MODULE_LICENSE("GPL");
1046 MODULE_ALIAS("spi:xpt2046");