drivers/input/touchscreen/xpt2046_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_ts.h"
  31
  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_ad_top;
 114         int     touch_ad_bottom;
 115         int     touch_ad_left;
 116         int     touch_ad_right;
 117         int     touch_virtualkey_length;
 118         spinlock_t              lock;
 119         struct hrtimer  timer;
 120         unsigned                pendown:1;      /* P: lock */
 121         unsigned                pending:1;      /* P: lock */
 122 // FIXME remove "irq_disabled"
 123         unsigned                irq_disabled:1; /* P: lock */
 124         unsigned                disabled:1;
 125         unsigned                is_suspended:1;
 126
 127         int                     (*filter)(void *data, int data_idx, int *val);
 128         void            *filter_data;
 129         void            (*filter_cleanup)(void *data);
 130         int                     (*get_pendown_state)(void);
 131         int                     gpio_pendown;
 132
 133         void            (*wait_for_sync)(void);
 134 #ifdef CONFIG_HAS_EARLYSUSPEND
 135         struct early_suspend early_suspend;
 136 #endif
 137 };
 138
 139 /* leave chip selected when we're done, for quicker re-select? */
 140 #if     0
 141 #define CS_CHANGE(xfer) ((xfer).cs_change = 1)
 142 #else
 143 #define CS_CHANGE(xfer) ((xfer).cs_change = 0)
 144 #endif
 145
 146 /*--------------------------------------------------------------------------*/
 147
 148 /* The xpt2046 has touchscreen and other sensors.
 149  * Earlier xpt2046 chips are somewhat compatible.
 150  */
 151 #define XPT2046_START                   (1 << 7)
 152 #define XPT2046_A2A1A0_d_y              (1 << 4)        /* differential */
 153 #define XPT2046_A2A1A0_d_z1             (3 << 4)        /* differential */
 154 #define XPT2046_A2A1A0_d_z2             (4 << 4)        /* differential */
 155 #define XPT2046_A2A1A0_d_x              (5 << 4)        /* differential */
 156 #define XPT2046_A2A1A0_temp0    (0 << 4)        /* non-differential */
 157 #define XPT2046_A2A1A0_vbatt    (2 << 4)        /* non-differential */
 158 #define XPT2046_A2A1A0_vaux             (6 << 4)        /* non-differential */
 159 #define XPT2046_A2A1A0_temp1    (7 << 4)        /* non-differential */
 160 #define XPT2046_8_BIT                   (1 << 3)
 161 #define XPT2046_12_BIT                  (0 << 3)
 162 #define XPT2046_SER                             (1 << 2)        /* non-differential */
 163 #define XPT2046_DFR                             (0 << 2)        /* differential */
 164 #define XPT2046_PD10_PDOWN              (0 << 0)        /* lowpower mode + penirq */
 165 #define XPT2046_PD10_ADC_ON             (1 << 0)        /* ADC on */
 166 #define XPT2046_PD10_REF_ON             (2 << 0)        /* vREF on + penirq */
 167 #define XPT2046_PD10_ALL_ON             (3 << 0)        /* ADC + vREF on */
 168
 169 #define MAX_12BIT       ((1<<12)-1)
 170
 171 /* leave ADC powered up (disables penirq) between differential samples */
 172 #define READ_12BIT_DFR(x, adc, vref) (XPT2046_START | XPT2046_A2A1A0_d_ ## x \
 173         | XPT2046_12_BIT | XPT2046_DFR | \
 174         (adc ? XPT2046_PD10_ADC_ON : 0) | (vref ? XPT2046_PD10_REF_ON : 0))
 175
 176 #define READ_Y(vref)    (READ_12BIT_DFR(y,  1, vref))
 177 #define READ_Z1(vref)   (READ_12BIT_DFR(z1, 1, vref))
 178 #define READ_Z2(vref)   (READ_12BIT_DFR(z2, 1, vref))
 179
 180 #define READ_X(vref)    (READ_12BIT_DFR(x,  1, vref))
 181 #define PWRDOWN         (READ_12BIT_DFR(y,  0, 0))      /* LAST */
 182
 183 /* single-ended samples need to first power up reference voltage;
 184  * we leave both ADC and VREF powered
 185  */
 186 #define READ_12BIT_SER(x) (XPT2046_START | XPT2046_A2A1A0_ ## x \
 187         | XPT2046_12_BIT | XPT2046_SER)
 188
 189 #define REF_ON  (READ_12BIT_DFR(x, 1, 1))
 190 #define REF_OFF (READ_12BIT_DFR(y, 0, 0))
 191
 192 /*--------------------------------------------------------------------------*/
 193 /*
 194  * touchscreen sensors  use differential conversions.
 195  */
 196
 197 struct dfr_req {
 198         u8                      command;
 199         u8                      pwrdown;
 200         u16                     dummy;          /* for the pwrdown read */
 201         __be16                  sample;
 202         struct spi_message      msg;
 203         struct spi_transfer     xfer[4];
 204 };
 205
 206 static void xpt2046_enable(struct xpt2046 *ts);
 207 static void xpt2046_disable(struct xpt2046 *ts);
 208 static int xpt2046_verifyAndConvert(struct xpt2046 *ts,u16 adx, u16 ady,u16 *x, u16 *y)
 209 {
 210         *x = ts->x_max * (ts->touch_ad_left - adx)/(ts->touch_ad_left - ts->touch_ad_right);
 211     *y = ts->y_max * (ts->touch_ad_top - ady)/(ts->touch_ad_top - ts->touch_ad_bottom);
 212
 213         xpt2046printk("%s:(%d/%d)\n",__FUNCTION__,*x, *y);
 214
 215         if((*x< ts->x_min) || (*x > ts->x_max))
 216                 return 1;
 217
 218         if((*y< ts->y_min) || (*y > ts->y_max + ts->touch_virtualkey_length))
 219                 return 1;
 220
 221
 222         return 0;
 223 }
 224 static int device_suspended(struct device *dev)
 225 {
 226         struct xpt2046 *ts = dev_get_drvdata(dev);
 227         return ts->is_suspended || ts->disabled;
 228 }
 229
 230 static int xpt2046_read12_dfr(struct device *dev, unsigned command)
 231 {
 232         struct spi_device       *spi = to_spi_device(dev);
 233         struct xpt2046          *ts = dev_get_drvdata(dev);
 234         struct dfr_req          *req = kzalloc(sizeof *req, GFP_KERNEL);
 235         int                     status;
 236
 237         if (!req)
 238                 return -ENOMEM;
 239
 240         spi_message_init(&req->msg);
 241
 242         /* take sample */
 243         req->command = (u8) command;
 244         req->xfer[0].tx_buf = &req->command;
 245         req->xfer[0].len = 1;
 246         spi_message_add_tail(&req->xfer[0], &req->msg);
 247
 248         req->xfer[1].rx_buf = &req->sample;
 249         req->xfer[1].len = 2;
 250         spi_message_add_tail(&req->xfer[1], &req->msg);
 251
 252         /* converter in low power mode & enable PENIRQ */
 253         req->pwrdown= PWRDOWN;
 254         req->xfer[2].tx_buf = &req->pwrdown;
 255         req->xfer[2].len = 1;
 256         spi_message_add_tail(&req->xfer[2], &req->msg);
 257
 258         req->xfer[3].rx_buf = &req->dummy;
 259         req->xfer[3].len = 2;
 260         CS_CHANGE(req->xfer[3]);
 261         spi_message_add_tail(&req->xfer[3], &req->msg);
 262
 263         ts->irq_disabled = 1;
 264         disable_irq(spi->irq);
 265         status = spi_sync(spi, &req->msg);
 266         ts->irq_disabled = 0;
 267         enable_irq(spi->irq);
 268
 269         if (status == 0) {
 270                 /* on-wire is a must-ignore bit, a BE12 value, then padding */
 271                 status = be16_to_cpu(req->sample);
 272                 status = status >> 3;
 273                 status &= 0x0fff;
 274                 xpt2046printk("***>%s:status=%d\n",__FUNCTION__,status);
 275         }
 276
 277         kfree(req);
 278         return status;
 279 }
 280
 281
 282
 283 /*--------------------------------------------------------------------------*/
 284
 285 static int get_pendown_state(struct xpt2046 *ts)
 286 {
 287         if (ts->get_pendown_state)
 288                 return ts->get_pendown_state();
 289
 290         return !gpio_get_value(ts->gpio_pendown);
 291 }
 292
 293 static void null_wait_for_sync(void)
 294 {
 295
 296 }
 297
 298 /*
 299  * PENIRQ only kicks the timer.  The timer only reissues the SPI transfer,
 300  * to retrieve touchscreen status.
 301  *
 302  * The SPI transfer completion callback does the real work.  It reports
 303  * touchscreen events and reactivates the timer (or IRQ) as appropriate.
 304  */
 305 static void xpt2046_rx(void *xpt)
 306 {
 307         struct xpt2046          *ts = xpt;
 308         struct xpt2046_packet   *packet = ts->packet;
 309         unsigned                Rt = 1;
 310         u16                     x, y;
 311
 312         /* xpt2046_rx_val() did in-place conversion (including byteswap) from
 313          * on-the-wire format as part of debouncing to get stable readings.
 314          */
 315         x = packet->tc.x;
 316         y = packet->tc.y;
 317
 318         xpt2046printk("***>%s:x=%d,y=%d\n",__FUNCTION__,x,y);
 319
 320         /* range filtering */
 321         if (x == MAX_12BIT)
 322                 x = 0;
 323
 324         /* Sample found inconsistent by debouncing or pressure is beyond
 325          * the maximum. Don't report it to user space, repeat at least
 326          * once more the measurement
 327          */
 328         if (packet->tc.ignore) {
 329
 330                 xpt2046printk("***>%s:ignored=%d\n",__FUNCTION__,packet->tc.ignore);
 331
 332                 hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 333                               HRTIMER_MODE_REL);
 334                 return;
 335         }
 336
 337         /* Maybe check the pendown state before reporting. This discards
 338          * false readings when the pen is lifted.
 339          */
 340         if (ts->penirq_recheck_delay_usecs) {
 341                 udelay(ts->penirq_recheck_delay_usecs);
 342                 if (!get_pendown_state(ts))
 343                 {
 344                         xpt2046printk("***>%s:get_pendown_state(ts)==0,discard false reading\n",__FUNCTION__);
 345                         Rt = 0;
 346                 }
 347         }
 348
 349         /* NOTE: We can't rely on the pressure to determine the pen down
 350          * state, even this controller has a pressure sensor.  The pressure
 351          * value can fluctuate for quite a while after lifting the pen and
 352          * in some cases may not even settle at the expected value.
 353          *
 354          * The only safe way to check for the pen up condition is in the
 355          * timer by reading the pen signal state (it's a GPIO _and_ IRQ).
 356          */
 357         if (Rt) {
 358                 struct input_dev *input = ts->input;
 359
 360                 if (ts->swap_xy)
 361                         swap(x, y);
 362
 363                 if(xpt2046_verifyAndConvert(ts,x,y,&x,&y))
 364                 {
 365                         xpt2046printk("***>%s:xpt2046_verifyAndConvert fail\n",__FUNCTION__);
 366                         goto out;
 367                 }
 368
 369                 if (!ts->pendown) {
 370                         input_report_key(input, BTN_TOUCH, 1);
 371                         ts->pendown = 1;
 372                         xpt2046printk("***>%s:input_report_key(pen down)\n",__FUNCTION__);
 373                 }
 374
 375                 input_report_abs(input, ABS_X, x);
 376                 input_report_abs(input, ABS_Y, y);
 377
 378                 input_sync(input);
 379                 xpt2046printk("***>%s:input_report_abs(%4d/%4d)\n",__FUNCTION__,x, y);
 380         }
 381 out:
 382         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
 383                         HRTIMER_MODE_REL);
 384 }
 385
 386 static int xpt2046_debounce(void *xpt, int data_idx, int *val)
 387 {
 388         struct xpt2046          *ts = xpt;
 389         static int average_val[2];
 390
 391
 392         xpt2046printk("***>%s:%d,%d,%d,%d,%d,%d,%d,%d\n",__FUNCTION__,
 393                 data_idx,ts->last_read,
 394           ts->read_cnt,ts->debounce_max,
 395                 abs(ts->last_read - *val),ts->debounce_tol,
 396                 ts->read_rep,ts->debounce_rep);
 397
 398         /* discard the first sample. */
 399          //on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
 400         if(!ts->read_cnt)
 401         {
 402                 //udelay(100);
 403                 ts->read_cnt++;
 404                 return XPT2046_FILTER_REPEAT;
 405         }
 406         if(*val == 4095 || *val == 0)
 407         {
 408                 ts->read_cnt = 0;
 409                 ts->last_read = 0;
 410                 memset(average_val,0,sizeof(average_val));
 411                 xpt2046printk("***>%s:*val == 4095 || *val == 0\n",__FUNCTION__);
 412                 return XPT2046_FILTER_IGNORE;
 413         }
 414
 415
 416         if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
 417                 /* Start over collecting consistent readings. */
 418                 ts->read_rep = 1;
 419                 average_val[data_idx] = *val;
 420                 /* Repeat it, if this was the first read or the read
 421                  * wasn't consistent enough. */
 422                 if (ts->read_cnt < ts->debounce_max) {
 423                         ts->last_read = *val;
 424                         ts->read_cnt++;
 425                         return XPT2046_FILTER_REPEAT;
 426                 } else {
 427                         /* Maximum number of debouncing reached and still
 428                          * not enough number of consistent readings. Abort
 429                          * the whole sample, repeat it in the next sampling
 430                          * period.
 431                          */
 432                         ts->read_cnt = 0;
 433                         ts->last_read = 0;
 434                         memset(average_val,0,sizeof(average_val));
 435                         xpt2046printk("***>%s:XPT2046_FILTER_IGNORE\n",__FUNCTION__);
 436                         return XPT2046_FILTER_IGNORE;
 437                 }
 438         }
 439         else {
 440                 average_val[data_idx] += *val;
 441
 442                 if (++ts->read_rep >= ts->debounce_rep) {
 443                         /* Got a good reading for this coordinate,
 444                          * go for the next one. */
 445                         ts->read_cnt = 0;
 446                         ts->read_rep = 0;
 447                         ts->last_read = 0;
 448                         *val = average_val[data_idx]/(ts->debounce_rep);
 449                         return XPT2046_FILTER_OK;
 450                 } else {
 451                         /* Read more values that are consistent. */
 452                         ts->read_cnt++;
 453
 454                         return XPT2046_FILTER_REPEAT;
 455                 }
 456         }
 457 }
 458
 459 static int xpt2046_no_filter(void *xpt, int data_idx, int *val)
 460 {
 461         return XPT2046_FILTER_OK;
 462 }
 463
 464 //#define spi_async(a,b)
 465 static void xpt2046_rx_val(void *xpt)
 466 {
 467         struct xpt2046 *ts = xpt;
 468         struct xpt2046_packet *packet = ts->packet;
 469         struct spi_message *m;
 470         struct spi_transfer *t;
 471         int val;
 472         int action;
 473         int status;
 474
 475         m = &ts->msg[ts->msg_idx];
 476         t = list_entry(m->transfers.prev, struct spi_transfer, transfer_list);
 477
 478         /* adjust:  on-wire is a must-ignore bit, a BE12 value, then padding;
 479          * built from two 8 bit values written msb-first.
 480          */
 481         val = (be16_to_cpup((__be16 *)t->rx_buf) >> 3) & 0x0fff;
 482
 483         xpt2046printk("***>%s:value=%d\n",__FUNCTION__,val);
 484
 485         action = ts->filter(ts->filter_data, ts->msg_idx, &val);
 486         switch (action) {
 487         case XPT2046_FILTER_REPEAT:
 488                 break;
 489         case XPT2046_FILTER_IGNORE:
 490                 packet->tc.ignore = 1;
 491                 /* Last message will contain xpt2046_rx() as the
 492                  * completion function.
 493                  */
 494                 m = ts->last_msg;
 495                 break;
 496         case XPT2046_FILTER_OK:
 497                 *(u16 *)t->rx_buf = val;
 498                 packet->tc.ignore = 0;
 499                 m = &ts->msg[++ts->msg_idx];
 500                 break;
 501         default:
 502                 BUG();
 503         }
 504         ts->wait_for_sync();
 505         status = spi_async(ts->spi, m);
 506         if (status)
 507                 dev_err(&ts->spi->dev, "spi_async --> %d\n",
 508                                 status);
 509 }
 510
 511 static enum hrtimer_restart xpt2046_timer(struct hrtimer *handle)
 512 {
 513         struct xpt2046  *ts = container_of(handle, struct xpt2046, timer);
 514         int             status = 0;
 515
 516         spin_lock(&ts->lock);
 517
 518         if (unlikely(!get_pendown_state(ts) ||
 519                      device_suspended(&ts->spi->dev))) {
 520                 if (ts->pendown) {
 521                         struct input_dev *input = ts->input;
 522                         input_report_key(input, BTN_TOUCH, 0);
 523                         input_sync(input);
 524
 525                         ts->pendown = 0;
 526
 527                         xpt2046printk("***>%s:input_report_key(The touchscreen up)\n",__FUNCTION__);
 528                 }
 529
 530                 /* measurement cycle ended */
 531                 if (!device_suspended(&ts->spi->dev)) {
 532                         xpt2046printk("***>%s:device_suspended==0\n",__FUNCTION__);
 533                         ts->irq_disabled = 0;
 534                         enable_irq(ts->spi->irq);
 535                 }
 536                 ts->pending = 0;
 537         } else {
 538                 /* pen is still down, continue with the measurement */
 539                 xpt2046printk("***>%s:pen is still down, continue with the measurement\n",__FUNCTION__);
 540                 ts->msg_idx = 0;
 541                 ts->wait_for_sync();
 542                 status = spi_async(ts->spi, &ts->msg[0]);
 543                 if (status)
 544                         dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
 545         }
 546
 547         spin_unlock(&ts->lock);
 548         return HRTIMER_NORESTART;
 549 }
 550
 551 static irqreturn_t xpt2046_irq(int irq, void *handle)
 552 {
 553         struct xpt2046 *ts = handle;
 554         unsigned long flags;
 555
 556         xpt2046printk("***>%s.....%s.....%d\n",__FILE__,__FUNCTION__,__LINE__);
 557
 558         spin_lock_irqsave(&ts->lock, flags);
 559
 560         if (likely(get_pendown_state(ts))) {
 561                 if (!ts->irq_disabled) {
 562                         /* The ARM do_simple_IRQ() dispatcher doesn't act
 563                          * like the other dispatchers:  it will report IRQs
 564                          * even after they've been disabled.  We work around
 565                          * that here.  (The "generic irq" framework may help...)
 566                          */
 567                         ts->irq_disabled = 1;
 568                         disable_irq_nosync(ts->spi->irq);
 569                         ts->pending = 1;
 570                         hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
 571                                         HRTIMER_MODE_REL);
 572                 }
 573         }
 574         spin_unlock_irqrestore(&ts->lock, flags);
 575
 576         return IRQ_HANDLED;
 577 }
 578
 579 /*--------------------------------------------------------------------------*/
 580
 581 /* Must be called with ts->lock held */
 582 static void xpt2046_disable(struct xpt2046 *ts)
 583 {
 584         if (ts->disabled)
 585                 return;
 586
 587         ts->disabled = 1;
 588
 589         /* are we waiting for IRQ, or polling? */
 590         if (!ts->pending) {
 591                 ts->irq_disabled = 1;
 592                 disable_irq(ts->spi->irq);
 593         } else {
 594                 /* the timer will run at least once more, and
 595                  * leave everything in a clean state, IRQ disabled
 596                  */
 597                 while (ts->pending) {
 598                         spin_unlock_irq(&ts->lock);
 599                         msleep(1);
 600                         spin_lock_irq(&ts->lock);
 601                 }
 602         }
 603
 604         /* we know the chip's in lowpower mode since we always
 605          * leave it that way after every request
 606          */
 607 }
 608
 609 /* Must be called with ts->lock held */
 610 static void xpt2046_enable(struct xpt2046 *ts)
 611 {
 612         if (!ts->disabled)
 613                 return;
 614
 615         ts->disabled = 0;
 616         ts->irq_disabled = 0;
 617         enable_irq(ts->spi->irq);
 618 }
 619
 620 static int xpt2046_pSuspend(struct xpt2046 *ts)
 621 {
 622         spin_lock_irq(&ts->lock);
 623
 624         ts->is_suspended = 1;
 625         xpt2046_disable(ts);
 626
 627         spin_unlock_irq(&ts->lock);
 628
 629         return 0;
 630 }
 631
 632 static int xpt2046_pResume(struct xpt2046 *ts)
 633 {
 634         spin_lock_irq(&ts->lock);
 635
 636         ts->is_suspended = 0;
 637         xpt2046_enable(ts);
 638
 639         spin_unlock_irq(&ts->lock);
 640
 641         return 0;
 642 }
 643
 644 #if !defined(CONFIG_HAS_EARLYSUSPEND)
 645 static int xpt2046_suspend(struct spi_device *spi, pm_message_t message)
 646 {
 647         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 648
 649         printk("xpt2046_suspend\n");
 650
 651         xpt2046_pSuspend(ts);
 652
 653         return 0;
 654 }
 655
 656 static int xpt2046_resume(struct spi_device *spi)
 657 {
 658         struct xpt2046 *ts = dev_get_drvdata(&spi->dev);
 659
 660         printk("xpt2046_resume\n");
 661
 662         xpt2046_pResume(ts);
 663
 664         return 0;
 665 }
 666
 667 #elif defined(CONFIG_HAS_EARLYSUSPEND)
 668 static void xpt2046_early_suspend(struct early_suspend *h)
 669 {
 670         struct xpt2046  *ts;
 671     ts = container_of(h, struct xpt2046, early_suspend);
 672
 673         printk("xpt2046_suspend early\n");
 674
 675         xpt2046_pSuspend(ts);
 676
 677         return;
 678 }
 679
 680 static void xpt2046_late_resume(struct early_suspend *h)
 681 {
 682         struct xpt2046  *ts;
 683     ts = container_of(h, struct xpt2046, early_suspend);
 684
 685         printk("xpt2046_resume late\n");
 686
 687         xpt2046_pResume(ts);
 688
 689         return;
 690 }
 691 #endif
 692
 693 static int __devinit setup_pendown(struct spi_device *spi, struct xpt2046 *ts)
 694 {
 695         struct xpt2046_platform_data *pdata = spi->dev.platform_data;
 696         int err;
 697
 698         /* REVISIT when the irq can be triggered active-low, or if for some
 699          * reason the touchscreen isn't hooked up, we don't need to access
 700          * the pendown state.
 701          */
 702         if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
 703                 dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
 704                 return -EINVAL;
 705         }
 706
 707         if (pdata->get_pendown_state) {
 708                 ts->get_pendown_state = pdata->get_pendown_state;
 709                 return 0;
 710         }
 711
 712     if (pdata->io_init) {
 713         err = pdata->io_init();
 714         if (err)
 715             dev_err(&spi->dev, "xpt2046 io_init fail\n");
 716     }
 717
 718         ts->gpio_pendown = pdata->gpio_pendown;
 719         strcpy(ts->pendown_iomux_name,pdata->pendown_iomux_name);
 720         ts->pendown_iomux_mode = pdata->pendown_iomux_mode;
 721
 722     rk29_mux_api_set(ts->pendown_iomux_name,pdata->pendown_iomux_mode);
 723         err = gpio_request(pdata->gpio_pendown, "xpt2046_pendown");
 724         if (err) {
 725                 dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
 726                                 pdata->gpio_pendown);
 727                 return err;
 728         }
 729
 730         err = gpio_pull_updown(pdata->gpio_pendown, GPIOPullUp);
 731         if (err) {
 732                 dev_err(&spi->dev, "failed to pullup pendown GPIO%d\n",
 733                                 pdata->gpio_pendown);
 734                 return err;
 735         }
 736         ts->gpio_pendown = pdata->gpio_pendown;
 737         return 0;
 738 }
 739
 740 static int __devinit xpt2046_probe(struct spi_device *spi)
 741 {
 742         struct xpt2046                  *ts;
 743         struct xpt2046_packet           *packet;
 744         struct input_dev                *input_dev;
 745         struct xpt2046_platform_data    *pdata = spi->dev.platform_data;
 746         struct spi_message              *m;
 747         struct spi_transfer             *x;
 748         int                             vref;
 749         int                             err;
 750
 751         if (!spi->irq) {
 752                 dev_dbg(&spi->dev, "no IRQ?\n");
 753                 return -ENODEV;
 754         }
 755         else{
 756                 spi->irq = gpio_to_irq(spi->irq);
 757                 dev_dbg(&spi->dev, "no IRQ?\n");
 758         }
 759
 760     if (!pdata) {
 761                 dev_err(&spi->dev, "empty platform_data\n");
 762                 return -EFAULT;
 763     }
 764
 765         /* don't exceed max specified sample rate */
 766         if (spi->max_speed_hz > (125000 * SAMPLE_BITS)) {
 767                 dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
 768                                 (spi->max_speed_hz/SAMPLE_BITS)/1000);
 769                 return -EINVAL;
 770         }
 771
 772         /* We'd set TX wordsize 8 bits and RX wordsize to 13 bits ... except
 773          * that even if the hardware can do that, the SPI controller driver
 774          * may not.  So we stick to very-portable 8 bit words, both RX and TX.
 775          */
 776         spi->bits_per_word = 8;
 777         spi->mode = SPI_MODE_0;
 778         err = spi_setup(spi);
 779         if (err < 0)
 780                 return err;
 781
 782         ts = kzalloc(sizeof(struct xpt2046), GFP_KERNEL);
 783         packet = kzalloc(sizeof(struct xpt2046_packet), GFP_KERNEL);
 784         input_dev = input_allocate_device();
 785         if (!ts || !packet || !input_dev) {
 786                 err = -ENOMEM;
 787                 goto err_free_mem;
 788         }
 789
 790         dev_set_drvdata(&spi->dev, ts);
 791
 792         ts->packet = packet;
 793         ts->spi = spi;
 794         ts->input = input_dev;
 795         ts->swap_xy = pdata->swap_xy;
 796
 797         hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 798         ts->timer.function = xpt2046_timer;
 799
 800         spin_lock_init(&ts->lock);
 801
 802         ts->model = pdata->model ? : 2046;
 803
 804         if (pdata->filter != NULL) {
 805                 if (pdata->filter_init != NULL) {
 806                         err = pdata->filter_init(pdata, &ts->filter_data);
 807                         if (err < 0)
 808                                 goto err_free_mem;
 809                 }
 810                 ts->filter = pdata->filter;
 811                 ts->filter_cleanup = pdata->filter_cleanup;
 812         } else if (pdata->debounce_max) {
 813                 ts->debounce_max = pdata->debounce_max;
 814                 if (ts->debounce_max < pdata->debounce_rep)
 815                         ts->debounce_max = pdata->debounce_rep;
 816                 ts->debounce_tol = pdata->debounce_tol;
 817                 ts->debounce_rep = pdata->debounce_rep;
 818                 ts->filter = xpt2046_debounce;
 819                 ts->filter_data = ts;
 820         } else
 821                 ts->filter = xpt2046_no_filter;
 822
 823         err = setup_pendown(spi, ts);
 824         if (err)
 825                 goto err_cleanup_filter;
 826
 827         if (pdata->penirq_recheck_delay_usecs)
 828                 ts->penirq_recheck_delay_usecs =
 829                                 pdata->penirq_recheck_delay_usecs;
 830
 831         ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
 832         ts->x_min = pdata->x_min;
 833         ts->x_max = pdata->x_max;
 834         ts->y_min = pdata->y_min;
 835         ts->y_max = pdata->y_max;
 836
 837         ts->touch_ad_top = pdata->touch_ad_top;
 838         ts->touch_ad_bottom= pdata->touch_ad_bottom;
 839         ts->touch_ad_left= pdata->touch_ad_left;
 840         ts->touch_ad_right= pdata->touch_ad_right;
 841
 842         ts->touch_virtualkey_length = pdata->touch_virtualkey_length;
 843
 844         snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
 845         snprintf(ts->name, sizeof(ts->name), "xpt%d-touchscreen", ts->model);
 846
 847         input_dev->name = ts->name;
 848         input_dev->phys = ts->phys;
 849         input_dev->dev.parent = &spi->dev;
 850
 851         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 852         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 853         input_set_abs_params(input_dev, ABS_X,
 854                         ts->x_min ? : 0,
 855                         ts->x_max ? : MAX_12BIT,
 856                         0, 0);
 857         input_set_abs_params(input_dev, ABS_Y,
 858                         ts->y_min ? : 0,
 859                         ts->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         x->tx_buf = &packet->read_y;
 875         x->len = 1;
 876         spi_message_add_tail(x, m);
 877
 878         x++;
 879         x->rx_buf = &packet->tc.y;
 880         x->len = 2;
 881         spi_message_add_tail(x, m);
 882
 883         m->complete = xpt2046_rx_val;
 884         m->context = ts;
 885
 886         m++;
 887         spi_message_init(m);
 888
 889         /* turn y- off, x+ on, then leave in lowpower */
 890         x++;
 891         packet->read_x = READ_X(vref);
 892         x->tx_buf = &packet->read_x;
 893         x->len = 1;
 894         spi_message_add_tail(x, m);
 895
 896         x++;
 897         x->rx_buf = &packet->tc.x;
 898         x->len = 2;
 899         spi_message_add_tail(x, m);
 900
 901         m->complete = xpt2046_rx_val;
 902         m->context = ts;
 903
 904         /* power down */
 905         m++;
 906         spi_message_init(m);
 907
 908         x++;
 909         packet->pwrdown = PWRDOWN;
 910         x->tx_buf = &packet->pwrdown;
 911         x->len = 1;
 912         spi_message_add_tail(x, m);
 913
 914         x++;
 915         x->rx_buf = &packet->dummy;
 916         x->len = 2;
 917         CS_CHANGE(*x);
 918         spi_message_add_tail(x, m);
 919
 920         m->complete = xpt2046_rx;
 921         m->context = ts;
 922
 923         ts->last_msg = m;
 924
 925         if (request_irq(spi->irq, xpt2046_irq, IRQF_TRIGGER_FALLING,
 926                         spi->dev.driver->name, ts)) {
 927                 xpt2046printk("%s:trying pin change workaround on irq %d\n",__FUNCTION__,spi->irq);
 928                 err = request_irq(spi->irq, xpt2046_irq,
 929                                   IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 930                                   spi->dev.driver->name, ts);
 931                 if (err) {
 932                         dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
 933                         goto err_free_gpio;
 934                 }
 935         }
 936         xpt2046printk("***>%s:touchscreen irq %d\n",__FUNCTION__,spi->irq);
 937
 938         /* take a first sample, leaving nPENIRQ active and vREF off; avoid
 939          * the touchscreen, in case it's not connected.
 940          */
 941         xpt2046_read12_dfr(&spi->dev,READ_X(1));
 942
 943         err = input_register_device(input_dev);
 944         if (err)
 945                 goto err_remove_attr_group;
 946
 947 #ifdef CONFIG_HAS_EARLYSUSPEND
 948         ts->early_suspend.suspend = xpt2046_early_suspend;
 949         ts->early_suspend.resume = xpt2046_late_resume;
 950         ts->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1;
 951         register_early_suspend(&ts->early_suspend);
 952 #endif
 953
 954     xpt2046printk("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 #if !defined(CONFIG_HAS_EARLYSUSPEND)
 979         xpt2046_suspend(spi, PMSG_SUSPEND);
 980 #elif defined(CONFIG_HAS_EARLYSUSPEND)
 981         xpt2046_early_suspend(&ts->early_suspend);
 982         unregister_early_suspend(&ts->early_suspend);
 983 #endif
 984
 985         free_irq(ts->spi->irq, ts);
 986         /* suspend left the IRQ disabled */
 987         enable_irq(ts->spi->irq);
 988
 989         if (ts->gpio_pendown != -1)
 990                 gpio_free(ts->gpio_pendown);
 991
 992         if (ts->filter_cleanup)
 993                 ts->filter_cleanup(ts->filter_data);
 994
 995         kfree(ts->packet);
 996         kfree(ts);
 997
 998         dev_dbg(&spi->dev, "unregistered touchscreen\n");
 999         return 0;
1000 }
1001
1002 static struct spi_driver xpt2046_driver = {
1003         .driver = {
1004                 .name   = "xpt2046_ts",
1005                 .bus    = &spi_bus_type,
1006                 .owner  = THIS_MODULE,
1007         },
1008         .probe          = xpt2046_probe,
1009         .remove         = __devexit_p(xpt2046_remove),
1010 #ifndef CONFIG_HAS_EARLYSUSPEND
1011         .suspend        = xpt2046_suspend,
1012         .resume         = xpt2046_resume,
1013 #endif
1014 };
1015 extern int spi_register_driver(struct spi_driver *sdrv);
1016 static int __init xpt2046_init(void)
1017 {
1018         return spi_register_driver(&xpt2046_driver);
1019 }
1020
1021
1022 static void __exit xpt2046_exit(void)
1023 {
1024         xpt2046printk("Touch panel drive XPT2046 driver exit...\n");
1025         spi_unregister_driver(&xpt2046_driver);
1026 }
1027 module_init(xpt2046_init);
1028 module_exit(xpt2046_exit);
1029
1030 MODULE_DESCRIPTION("rk29xx spi xpt2046 TouchScreen Driver");
1031 MODULE_LICENSE("GPL");
1032 MODULE_ALIAS("spi:xpt2046");