target/linux/omap24xx/patches-2.6.38/600-tsc2005.patch

   1 ---
   2  drivers/input/touchscreen/Kconfig   |   11
   3  drivers/input/touchscreen/Makefile  |    1
   4  drivers/input/touchscreen/tsc2005.c |  958 ++++++++++++++++++++++++++++++++++++
   5  include/linux/spi/tsc2005.h         |   30 +
   6  4 files changed, 1000 insertions(+)
   7
   8 --- a/drivers/input/touchscreen/Kconfig
   9 +++ b/drivers/input/touchscreen/Kconfig
  10 @@ -629,6 +629,17 @@ config TOUCHSCREEN_TOUCHIT213
  11           To compile this driver as a module, choose M here: the
  12           module will be called touchit213.
  13
  14 +config TOUCHSCREEN_TSC2005
  15 +        tristate "TSC2005 based touchscreens"
  16 +        depends on SPI_MASTER
  17 +        help
  18 +          Say Y here if you have a TSC2005 based touchscreen.
  19 +
  20 +         If unsure, say N.
  21 +
  22 +         To compile this driver as a module, choose M here: the
  23 +         module will be called tsc2005.
  24 +
  25  config TOUCHSCREEN_TSC2007
  26         tristate "TSC2007 based touchscreens"
  27         depends on I2C
  28 --- a/drivers/input/touchscreen/Makefile
  29 +++ b/drivers/input/touchscreen/Makefile
  30 @@ -45,6 +45,7 @@ obj-$(CONFIG_TOUCHSCREEN_TNETV107X)   += t
  31  obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213)   += touchit213.o
  32  obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)   += touchright.o
  33  obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)     += touchwin.o
  34 +obj-$(CONFIG_TOUCHSCREEN_TSC2005)      += tsc2005.o
  35  obj-$(CONFIG_TOUCHSCREEN_TSC2007)      += tsc2007.o
  36  obj-$(CONFIG_TOUCHSCREEN_UCB1400)      += ucb1400_ts.o
  37  obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001)  += wacom_w8001.o
  38 --- /dev/null
  39 +++ b/drivers/input/touchscreen/tsc2005.c
  40 @@ -0,0 +1,958 @@
  41 +/*
  42 + * TSC2005 touchscreen driver
  43 + *
  44 + * Copyright (C) 2006-2008 Nokia Corporation
  45 + *
  46 + * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
  47 + * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
  48 + *
  49 + * This program is free software; you can redistribute it and/or modify
  50 + * it under the terms of the GNU General Public License as published by
  51 + * the Free Software Foundation; either version 2 of the License, or
  52 + * (at your option) any later version.
  53 + *
  54 + * This program is distributed in the hope that it will be useful,
  55 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  56 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  57 + * GNU General Public License for more details.
  58 + *
  59 + * You should have received a copy of the GNU General Public License
  60 + * along with this program; if not, write to the Free Software
  61 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  62 + *
  63 + */
  64 +
  65 +#include <linux/kernel.h>
  66 +#include <linux/module.h>
  67 +#include <linux/input.h>
  68 +#include <linux/interrupt.h>
  69 +#include <linux/delay.h>
  70 +#include <linux/spi/spi.h>
  71 +
  72 +#include <linux/spi/tsc2005.h>
  73 +
  74 +/**
  75 + * The touchscreen interface operates as follows:
  76 + *
  77 + * Initialize:
  78 + *    Request access to GPIO103 (DAV)
  79 + *    tsc2005_ts_irq_handler will trigger when DAV line goes down
  80 + *
  81 + *  1) Pen is pressed against touchscreeen
  82 + *  2) TSC2005 performs AD conversion
  83 + *  3) After the conversion is done TSC2005 drives DAV line down
  84 + *  4) GPIO IRQ is received and tsc2005_ts_irq_handler is called
  85 + *  5) tsc2005_ts_irq_handler queues up an spi transfer to fetch
  86 + *     the x, y, z1, z2 values
  87 + *  6) tsc2005_ts_rx() reports coordinates to input layer and
  88 + *     sets up tsc2005_ts_timer() to be called after TSC2005_TS_SCAN_TIME
  89 + *  7)  When the penup_timer expires, there have not been DAV interrupts
  90 + *     during the last 20ms which means the pen has been lifted.
  91 + */
  92 +
  93 +#define TSC2005_VDD_LOWER_27
  94 +
  95 +#ifdef TSC2005_VDD_LOWER_27
  96 +#define TSC2005_HZ     (10000000)
  97 +#else
  98 +#define TSC2005_HZ     (25000000)
  99 +#endif
 100 +
 101 +#define TSC2005_CMD    (0x80)
 102 +#define TSC2005_REG    (0x00)
 103 +
 104 +#define TSC2005_CMD_STOP       (1)
 105 +#define TSC2005_CMD_10BIT      (0 << 2)
 106 +#define TSC2005_CMD_12BIT      (1 << 2)
 107 +
 108 +#define TSC2005_CMD_SCAN_XYZZ  (0 << 3)
 109 +#define TSC2005_CMD_SCAN_XY    (1 << 3)
 110 +#define TSC2005_CMD_SCAN_X     (2 << 3)
 111 +#define TSC2005_CMD_SCAN_Y     (3 << 3)
 112 +#define TSC2005_CMD_SCAN_ZZ    (4 << 3)
 113 +#define TSC2005_CMD_AUX_SINGLE (5 << 3)
 114 +#define TSC2005_CMD_TEMP1      (6 << 3)
 115 +#define TSC2005_CMD_TEMP2      (7 << 3)
 116 +#define TSC2005_CMD_AUX_CONT   (8 << 3)
 117 +#define TSC2005_CMD_TEST_X_CONN        (9 << 3)
 118 +#define TSC2005_CMD_TEST_Y_CONN        (10 << 3)
 119 +#define TSC2005_CMD_TEST_SHORT (11 << 3)
 120 +/* command 12 reserved, according to 2008-03 erratum */
 121 +#define TSC2005_CMD_DRIVE_XX   (13 << 3)
 122 +#define TSC2005_CMD_DRIVE_YY   (14 << 3)
 123 +#define TSC2005_CMD_DRIVE_YX   (15 << 3)
 124 +
 125 +#define TSC2005_REG_X          (0 << 3)
 126 +#define TSC2005_REG_Y          (1 << 3)
 127 +#define TSC2005_REG_Z1         (2 << 3)
 128 +#define TSC2005_REG_Z2         (3 << 3)
 129 +#define TSC2005_REG_AUX                (4 << 3)
 130 +#define TSC2005_REG_TEMP1      (5 << 3)
 131 +#define TSC2005_REG_TEMP2      (6 << 3)
 132 +#define TSC2005_REG_STATUS     (7 << 3)
 133 +#define TSC2005_REG_AUX_HIGH   (8 << 3)
 134 +#define TSC2005_REG_AUX_LOW    (9 << 3)
 135 +#define TSC2005_REG_TEMP_HIGH  (10 << 3)
 136 +#define TSC2005_REG_TEMP_LOW   (11 << 3)
 137 +#define TSC2005_REG_CFR0       (12 << 3)
 138 +#define TSC2005_REG_CFR1       (13 << 3)
 139 +#define TSC2005_REG_CFR2       (14 << 3)
 140 +#define TSC2005_REG_FUNCTION   (15 << 3)
 141 +
 142 +#define TSC2005_REG_PND0       (1 << 1)
 143 +#define TSC2005_REG_READ       (0x01)
 144 +#define TSC2005_REG_WRITE      (0x00)
 145 +
 146 +
 147 +#define TSC2005_CFR0_LONGSAMPLING      (1)
 148 +#define TSC2005_CFR0_DETECTINWAIT      (1 << 1)
 149 +#define TSC2005_CFR0_SENSETIME_32US    (0)
 150 +#define TSC2005_CFR0_SENSETIME_96US    (1 << 2)
 151 +#define TSC2005_CFR0_SENSETIME_544US   (1 << 3)
 152 +#define TSC2005_CFR0_SENSETIME_2080US  (1 << 4)
 153 +#define TSC2005_CFR0_SENSETIME_2656US  (0x001C)
 154 +#define TSC2005_CFR0_PRECHARGE_20US    (0x0000)
 155 +#define TSC2005_CFR0_PRECHARGE_84US    (0x0020)
 156 +#define TSC2005_CFR0_PRECHARGE_276US   (0x0040)
 157 +#define TSC2005_CFR0_PRECHARGE_1044US  (0x0080)
 158 +#define TSC2005_CFR0_PRECHARGE_1364US  (0x00E0)
 159 +#define TSC2005_CFR0_STABTIME_0US      (0x0000)
 160 +#define TSC2005_CFR0_STABTIME_100US    (0x0100)
 161 +#define TSC2005_CFR0_STABTIME_500US    (0x0200)
 162 +#define TSC2005_CFR0_STABTIME_1MS      (0x0300)
 163 +#define TSC2005_CFR0_STABTIME_5MS      (0x0400)
 164 +#define TSC2005_CFR0_STABTIME_100MS    (0x0700)
 165 +#define TSC2005_CFR0_CLOCK_4MHZ                (0x0000)
 166 +#define TSC2005_CFR0_CLOCK_2MHZ                (0x0800)
 167 +#define TSC2005_CFR0_CLOCK_1MHZ                (0x1000)
 168 +#define TSC2005_CFR0_RESOLUTION12      (0x2000)
 169 +#define TSC2005_CFR0_STATUS            (0x4000)
 170 +#define TSC2005_CFR0_PENMODE           (0x8000)
 171 +
 172 +#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS  |   \
 173 +                                TSC2005_CFR0_CLOCK_1MHZ    |   \
 174 +                                TSC2005_CFR0_RESOLUTION12  |   \
 175 +                                TSC2005_CFR0_PRECHARGE_276US | \
 176 +                                TSC2005_CFR0_PENMODE)
 177 +
 178 +/* Bits common to both read and write of config register 0 */
 179 +#define        TSC2005_CFR0_RW_MASK    0x3fff
 180 +
 181 +#define TSC2005_CFR1_BATCHDELAY_0MS    (0x0000)
 182 +#define TSC2005_CFR1_BATCHDELAY_1MS    (0x0001)
 183 +#define TSC2005_CFR1_BATCHDELAY_2MS    (0x0002)
 184 +#define TSC2005_CFR1_BATCHDELAY_4MS    (0x0003)
 185 +#define TSC2005_CFR1_BATCHDELAY_10MS   (0x0004)
 186 +#define TSC2005_CFR1_BATCHDELAY_20MS   (0x0005)
 187 +#define TSC2005_CFR1_BATCHDELAY_40MS   (0x0006)
 188 +#define TSC2005_CFR1_BATCHDELAY_100MS  (0x0007)
 189 +
 190 +#define TSC2005_CFR1_INITVALUE (TSC2005_CFR1_BATCHDELAY_4MS)
 191 +
 192 +#define TSC2005_CFR2_MAVE_TEMP (0x0001)
 193 +#define TSC2005_CFR2_MAVE_AUX  (0x0002)
 194 +#define TSC2005_CFR2_MAVE_Z    (0x0004)
 195 +#define TSC2005_CFR2_MAVE_Y    (0x0008)
 196 +#define TSC2005_CFR2_MAVE_X    (0x0010)
 197 +#define TSC2005_CFR2_AVG_1     (0x0000)
 198 +#define TSC2005_CFR2_AVG_3     (0x0400)
 199 +#define TSC2005_CFR2_AVG_7     (0x0800)
 200 +#define TSC2005_CFR2_MEDIUM_1  (0x0000)
 201 +#define TSC2005_CFR2_MEDIUM_3  (0x1000)
 202 +#define TSC2005_CFR2_MEDIUM_7  (0x2000)
 203 +#define TSC2005_CFR2_MEDIUM_15 (0x3000)
 204 +
 205 +#define TSC2005_CFR2_IRQ_MASK   (0xC000)
 206 +#define TSC2005_CFR2_IRQ_DAV   (0x4000)
 207 +#define TSC2005_CFR2_IRQ_PEN   (0x8000)
 208 +#define TSC2005_CFR2_IRQ_PENDAV        (0x0000)
 209 +
 210 +#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_IRQ_PENDAV |      \
 211 +                                TSC2005_CFR2_MAVE_X    |       \
 212 +                                TSC2005_CFR2_MAVE_Y    |       \
 213 +                                TSC2005_CFR2_MAVE_Z    |       \
 214 +                                TSC2005_CFR2_MEDIUM_15 |       \
 215 +                                TSC2005_CFR2_AVG_7)
 216 +
 217 +#define MAX_12BIT                                      ((1 << 12) - 1)
 218 +#define TS_SAMPLES                                     4
 219 +#define TSC2005_TS_PENUP_TIME                          40
 220 +
 221 +static const u32 tsc2005_read_reg[] = {
 222 +       (TSC2005_REG | TSC2005_REG_X | TSC2005_REG_READ) << 16,
 223 +       (TSC2005_REG | TSC2005_REG_Y | TSC2005_REG_READ) << 16,
 224 +       (TSC2005_REG | TSC2005_REG_Z1 | TSC2005_REG_READ) << 16,
 225 +       (TSC2005_REG | TSC2005_REG_Z2 | TSC2005_REG_READ) << 16,
 226 +};
 227 +#define NUM_READ_REGS  (sizeof(tsc2005_read_reg)/sizeof(tsc2005_read_reg[0]))
 228 +
 229 +struct tsc2005 {
 230 +       struct spi_device       *spi;
 231 +
 232 +       struct input_dev        *idev;
 233 +       char                    phys[32];
 234 +       struct timer_list       penup_timer;
 235 +
 236 +       /* ESD recovery via a hardware reset if the tsc2005
 237 +        * doesn't respond after a configurable period (in ms) of
 238 +        * IRQ/SPI inactivity. If esd_timeout is 0, timer and work
 239 +        * fields are used.
 240 +        */
 241 +       u32                     esd_timeout;
 242 +       struct timer_list       esd_timer;
 243 +       struct work_struct      esd_work;
 244 +
 245 +       spinlock_t              lock;
 246 +       struct mutex            mutex;
 247 +
 248 +       struct spi_message      read_msg;
 249 +       struct spi_transfer     read_xfer[NUM_READ_REGS];
 250 +       u32                     data[NUM_READ_REGS];
 251 +
 252 +       /* previously reported x,y,p (if pen_down) */
 253 +       int                     out_x;
 254 +       int                     out_y;
 255 +       int                     out_p;
 256 +       /* fudge parameters - changes must exceed one of these. */
 257 +       int                     fudge_x;
 258 +       int                     fudge_y;
 259 +       int                     fudge_p;
 260 +       /* raw copy of previous x,y,z */
 261 +       int                     in_x;
 262 +       int                     in_y;
 263 +       int                     in_z1;
 264 +       int                     in_z2;
 265 +       /* average accumulators for each component */
 266 +       int                     sample_cnt;
 267 +       int                     avg_x;
 268 +       int                     avg_y;
 269 +       int                     avg_z1;
 270 +       int                     avg_z2;
 271 +       /* configuration */
 272 +       int                     x_plate_ohm;
 273 +       int                     hw_avg_max;
 274 +       int                     stab_time;
 275 +       int                     p_max;
 276 +       int                     touch_pressure;
 277 +       /* status */
 278 +       u8                      sample_sent;
 279 +       u8                      pen_down;
 280 +       u8                      disabled;
 281 +       u8                      disable_depth;
 282 +       u8                      spi_pending;
 283 +
 284 +       void (*set_reset)(bool enable);
 285 +};
 286 +
 287 +static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
 288 +{
 289 +       u8 data = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
 290 +       struct spi_message msg;
 291 +       struct spi_transfer xfer = { 0 };
 292 +
 293 +       xfer.tx_buf = &data;
 294 +       xfer.rx_buf = NULL;
 295 +       xfer.len = 1;
 296 +       xfer.bits_per_word = 8;
 297 +
 298 +       spi_message_init(&msg);
 299 +       spi_message_add_tail(&xfer, &msg);
 300 +       spi_sync(ts->spi, &msg);
 301 +}
 302 +
 303 +static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
 304 +{
 305 +       u32 tx;
 306 +       struct spi_message msg;
 307 +       struct spi_transfer xfer = { 0 };
 308 +
 309 +       tx = (TSC2005_REG | reg | TSC2005_REG_PND0 |
 310 +              TSC2005_REG_WRITE) << 16;
 311 +       tx |= value;
 312 +
 313 +       xfer.tx_buf = &tx;
 314 +       xfer.rx_buf = NULL;
 315 +       xfer.len = 4;
 316 +       xfer.bits_per_word = 24;
 317 +
 318 +       spi_message_init(&msg);
 319 +       spi_message_add_tail(&xfer, &msg);
 320 +       spi_sync(ts->spi, &msg);
 321 +}
 322 +
 323 +static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
 324 +{
 325 +       u32 tx;
 326 +       u32 rx = 0;
 327 +       struct spi_message msg;
 328 +       struct spi_transfer xfer = { 0 };
 329 +
 330 +       tx = (TSC2005_REG | reg | TSC2005_REG_READ) << 16;
 331 +
 332 +       xfer.tx_buf = &tx;
 333 +       xfer.rx_buf = &rx;
 334 +       xfer.len = 4;
 335 +       xfer.bits_per_word = 24;
 336 +
 337 +       spi_message_init(&msg);
 338 +       spi_message_add_tail(&xfer, &msg);
 339 +       spi_sync(ts->spi, &msg);
 340 +       *value = rx;
 341 +}
 342 +
 343 +static void tsc2005_ts_update_pen_state(struct tsc2005 *ts,
 344 +                                       int x, int y, int pressure)
 345 +{
 346 +       if (pressure) {
 347 +               input_report_abs(ts->idev, ABS_X, x);
 348 +               input_report_abs(ts->idev, ABS_Y, y);
 349 +               input_report_abs(ts->idev, ABS_PRESSURE, pressure);
 350 +               if (!ts->pen_down) {
 351 +                       input_report_key(ts->idev, BTN_TOUCH, 1);
 352 +                       ts->pen_down = 1;
 353 +               }
 354 +       } else {
 355 +               input_report_abs(ts->idev, ABS_PRESSURE, 0);
 356 +               if (ts->pen_down) {
 357 +                       input_report_key(ts->idev, BTN_TOUCH, 0);
 358 +                       ts->pen_down = 0;
 359 +               }
 360 +       }
 361 +
 362 +       input_sync(ts->idev);
 363 +}
 364 +
 365 +/*
 366 + * This function is called by the SPI framework after the coordinates
 367 + * have been read from TSC2005
 368 + */
 369 +static void tsc2005_ts_rx(void *arg)
 370 +{
 371 +       struct tsc2005 *ts = arg;
 372 +       unsigned long flags;
 373 +       int inside_rect, pressure_limit;
 374 +       int x, y, z1, z2, pressure;
 375 +
 376 +       spin_lock_irqsave(&ts->lock, flags);
 377 +
 378 +       if (ts->disable_depth) {
 379 +               ts->spi_pending = 0;
 380 +               goto out;
 381 +       }
 382 +
 383 +       x = ts->data[0];
 384 +       y = ts->data[1];
 385 +       z1 = ts->data[2];
 386 +       z2 = ts->data[3];
 387 +
 388 +       /* validate pressure and position */
 389 +       if (x > MAX_12BIT || y > MAX_12BIT)
 390 +               goto out;
 391 +
 392 +       /* skip coords if the pressure-components are out of range */
 393 +       if (z1 < 100 || z2 > MAX_12BIT || z1 >= z2)
 394 +               goto out;
 395 +
 396 +       /* skip point if this is a pen down with the exact same values as
 397 +        * the value before pen-up - that implies SPI fed us stale data
 398 +        */
 399 +       if (!ts->pen_down &&
 400 +           ts->in_x == x &&
 401 +           ts->in_y == y &&
 402 +           ts->in_z1 == z1 &&
 403 +           ts->in_z2 == z2)
 404 +               goto out;
 405 +
 406 +       /* At this point we are happy we have a valid and useful reading.
 407 +        * Remember it for later comparisons. We may now begin downsampling
 408 +        */
 409 +       ts->in_x = x;
 410 +       ts->in_y = y;
 411 +       ts->in_z1 = z1;
 412 +       ts->in_z2 = z2;
 413 +
 414 +       /* don't run average on the "pen down" event */
 415 +       if (ts->sample_sent) {
 416 +               ts->avg_x += x;
 417 +               ts->avg_y += y;
 418 +               ts->avg_z1 += z1;
 419 +               ts->avg_z2 += z2;
 420 +
 421 +               if (++ts->sample_cnt < TS_SAMPLES)
 422 +                       goto out;
 423 +
 424 +               x = ts->avg_x / TS_SAMPLES;
 425 +               y = ts->avg_y / TS_SAMPLES;
 426 +               z1 = ts->avg_z1 / TS_SAMPLES;
 427 +               z2 = ts->avg_z2 / TS_SAMPLES;
 428 +       }
 429 +
 430 +       ts->sample_cnt = 0;
 431 +       ts->avg_x = 0;
 432 +       ts->avg_y = 0;
 433 +       ts->avg_z1 = 0;
 434 +       ts->avg_z2 = 0;
 435 +
 436 +       pressure = x * (z2 - z1) / z1;
 437 +       pressure = pressure * ts->x_plate_ohm / 4096;
 438 +
 439 +       pressure_limit = ts->sample_sent ? ts->p_max : ts->touch_pressure;
 440 +       if (pressure > pressure_limit)
 441 +               goto out;
 442 +
 443 +       /* Discard the event if it still is within the previous rect -
 444 +        * unless the pressure is clearly harder, but then use previous
 445 +        * x,y position. If any coordinate deviates enough, fudging
 446 +        * of all three will still take place in the input layer.
 447 +        */
 448 +       inside_rect = (ts->sample_sent &&
 449 +               x > (int)ts->out_x - ts->fudge_x &&
 450 +               x < (int)ts->out_x + ts->fudge_x &&
 451 +               y > (int)ts->out_y - ts->fudge_y &&
 452 +               y < (int)ts->out_y + ts->fudge_y);
 453 +       if (inside_rect)
 454 +               x = ts->out_x, y = ts->out_y;
 455 +
 456 +       if (!inside_rect || pressure < (ts->out_p - ts->fudge_p)) {
 457 +               tsc2005_ts_update_pen_state(ts, x, y, pressure);
 458 +               ts->sample_sent = 1;
 459 +               ts->out_x = x;
 460 +               ts->out_y = y;
 461 +               ts->out_p = pressure;
 462 +       }
 463 +out:
 464 +       if (ts->spi_pending > 1) {
 465 +               /* One or more interrupts (sometimes several dozens)
 466 +                * occured while waiting for the SPI read - get
 467 +                * another read going.
 468 +                */
 469 +               ts->spi_pending = 1;
 470 +               if (spi_async(ts->spi, &ts->read_msg)) {
 471 +                       dev_err(&ts->spi->dev, "ts: spi_async() failed");
 472 +                       ts->spi_pending = 0;
 473 +               }
 474 +       } else
 475 +               ts->spi_pending = 0;
 476 +
 477 +       /* kick pen up timer - to make sure it expires again(!) */
 478 +       if (ts->sample_sent) {
 479 +               mod_timer(&ts->penup_timer,
 480 +                         jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME));
 481 +               /* Also kick the watchdog, as we still think we're alive */
 482 +               if (ts->esd_timeout && ts->disable_depth == 0) {
 483 +                       unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
 484 +                       mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
 485 +               }
 486 +       }
 487 +       spin_unlock_irqrestore(&ts->lock, flags);
 488 +}
 489 +
 490 +/* This penup timer is very forgiving of delayed SPI reads. The
 491 + * (ESD) watchdog will rescue us if spi_pending remains set, unless
 492 + * we are enterring the disabled state. In that case we must just
 493 + * handle the pen up, and let disabling complete.
 494 + */
 495 +static void tsc2005_ts_penup_timer_handler(unsigned long data)
 496 +{
 497 +       struct tsc2005 *ts = (struct tsc2005 *)data;
 498 +       if ((!ts->spi_pending || ts->disable_depth) &&
 499 +           ts->sample_sent) {
 500 +               tsc2005_ts_update_pen_state(ts, 0, 0, 0);
 501 +               ts->sample_sent = 0;
 502 +       }
 503 +}
 504 +
 505 +/*
 506 + * This interrupt is called when pen is down and coordinates are
 507 + * available. That is indicated by a either:
 508 + * a) a rising edge on PINTDAV or (PENDAV mode)
 509 + * b) a falling edge on DAV line (DAV mode)
 510 + * depending on the setting of the IRQ bits in the CFR2 setting above.
 511 + */
 512 +static irqreturn_t tsc2005_ts_irq_handler(int irq, void *dev_id)
 513 +{
 514 +       struct tsc2005 *ts = dev_id;
 515 +       if (ts->disable_depth)
 516 +               goto out;
 517 +
 518 +       if (!ts->spi_pending) {
 519 +               if (spi_async(ts->spi, &ts->read_msg)) {
 520 +                       dev_err(&ts->spi->dev, "ts: spi_async() failed");
 521 +                       goto out;
 522 +               }
 523 +       }
 524 +       /* By shifting in 1s we can never wrap */
 525 +       ts->spi_pending = (ts->spi_pending<<1)+1;
 526 +
 527 +       /* Kick pen up timer only if it's not been started yet. Strictly,
 528 +        * it isn't even necessary to start it at all here,  but doing so
 529 +        * keeps an equivalence between pen state and timer state.
 530 +        * The SPI read loop will keep pushing it into the future.
 531 +        * If it times out with an SPI pending, it's ignored anyway.
 532 +        */
 533 +       if (!timer_pending(&ts->penup_timer)) {
 534 +               unsigned long pu = msecs_to_jiffies(TSC2005_TS_PENUP_TIME);
 535 +               ts->penup_timer.expires = jiffies + pu;
 536 +               add_timer(&ts->penup_timer);
 537 +       }
 538 +out:
 539 +       return IRQ_HANDLED;
 540 +}
 541 +
 542 +static void tsc2005_ts_setup_spi_xfer(struct tsc2005 *ts)
 543 +{
 544 +       struct spi_message *m = &ts->read_msg;
 545 +       struct spi_transfer *x = &ts->read_xfer[0];
 546 +       int i;
 547 +
 548 +       spi_message_init(m);
 549 +
 550 +       for (i = 0; i < NUM_READ_REGS; i++, x++) {
 551 +               x->tx_buf = &tsc2005_read_reg[i];
 552 +               x->rx_buf = &ts->data[i];
 553 +               x->len = 4;
 554 +               x->bits_per_word = 24;
 555 +               x->cs_change = i < (NUM_READ_REGS - 1);
 556 +               spi_message_add_tail(x, m);
 557 +       }
 558 +
 559 +       m->complete = tsc2005_ts_rx;
 560 +       m->context = ts;
 561 +}
 562 +
 563 +static ssize_t tsc2005_ts_pen_down_show(struct device *dev,
 564 +                                       struct device_attribute *attr,
 565 +                                       char *buf)
 566 +{
 567 +       struct tsc2005 *ts = dev_get_drvdata(dev);
 568 +
 569 +       return sprintf(buf, "%u\n", ts->pen_down);
 570 +}
 571 +
 572 +static DEVICE_ATTR(pen_down, S_IRUGO, tsc2005_ts_pen_down_show, NULL);
 573 +
 574 +static int tsc2005_configure(struct tsc2005 *ts, int flags)
 575 +{
 576 +       tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
 577 +       tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
 578 +       tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
 579 +       tsc2005_cmd(ts, flags);
 580 +
 581 +       return 0;
 582 +}
 583 +
 584 +static void tsc2005_start_scan(struct tsc2005 *ts)
 585 +{
 586 +       tsc2005_configure(ts, TSC2005_CMD_SCAN_XYZZ);
 587 +}
 588 +
 589 +static void tsc2005_stop_scan(struct tsc2005 *ts)
 590 +{
 591 +       tsc2005_cmd(ts, TSC2005_CMD_STOP);
 592 +}
 593 +
 594 +/* Must be called with mutex held */
 595 +static void tsc2005_disable(struct tsc2005 *ts)
 596 +{
 597 +       if (ts->disable_depth++ != 0)
 598 +               return;
 599 +
 600 +       disable_irq(ts->spi->irq);
 601 +       if (ts->esd_timeout)
 602 +               del_timer(&ts->esd_timer);
 603 +
 604 +       /* wait until penup timer expire normally */
 605 +       do {
 606 +               msleep(4);
 607 +       } while (ts->sample_sent);
 608 +
 609 +       tsc2005_stop_scan(ts);
 610 +}
 611 +
 612 +static void tsc2005_enable(struct tsc2005 *ts)
 613 +{
 614 +       if (ts->disable_depth != 1)
 615 +               goto out;
 616 +
 617 +       if (ts->esd_timeout) {
 618 +               unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
 619 +               ts->esd_timer.expires = round_jiffies(jiffies+wdj);
 620 +               add_timer(&ts->esd_timer);
 621 +       }
 622 +       tsc2005_start_scan(ts);
 623 +       enable_irq(ts->spi->irq);
 624 +out:
 625 +       --ts->disable_depth;
 626 +}
 627 +
 628 +static ssize_t tsc2005_disable_show(struct device *dev,
 629 +                                   struct device_attribute *attr, char *buf)
 630 +{
 631 +       struct tsc2005 *ts = dev_get_drvdata(dev);
 632 +
 633 +       return sprintf(buf, "%u\n", ts->disabled);
 634 +}
 635 +
 636 +static ssize_t tsc2005_disable_store(struct device *dev,
 637 +                                    struct device_attribute *attr,
 638 +                                    const char *buf, size_t count)
 639 +{
 640 +       struct tsc2005          *ts = dev_get_drvdata(dev);
 641 +       unsigned long res;
 642 +       int i;
 643 +
 644 +       if (strict_strtoul(buf, 10, &res) < 0)
 645 +               return -EINVAL;
 646 +       i = res ? 1 : 0;
 647 +
 648 +       mutex_lock(&ts->mutex);
 649 +       if (i == ts->disabled)
 650 +               goto out;
 651 +       ts->disabled = i;
 652 +
 653 +       if (i)
 654 +               tsc2005_disable(ts);
 655 +       else
 656 +               tsc2005_enable(ts);
 657 +out:
 658 +       mutex_unlock(&ts->mutex);
 659 +       return count;
 660 +}
 661 +
 662 +static DEVICE_ATTR(disable_ts, 0664, tsc2005_disable_show,
 663 +                  tsc2005_disable_store);
 664 +
 665 +static ssize_t tsc2005_ctrl_selftest_show(struct device *dev,
 666 +                                         struct device_attribute *attr,
 667 +                                         char *buf)
 668 +{
 669 +       u16 temp_high_orig, temp_high_test, temp_high;
 670 +       unsigned int result = 1;
 671 +       struct tsc2005 *ts = dev_get_drvdata(dev);
 672 +
 673 +       if (!ts->set_reset) {
 674 +               dev_warn(&ts->spi->dev,
 675 +                        "unable to selftest: reset not configured\n");
 676 +               result = 0;
 677 +               goto out;
 678 +       }
 679 +
 680 +       mutex_lock(&ts->mutex);
 681 +       tsc2005_disable(ts);
 682 +
 683 +       /* Test ctrl communications via temp high / low registers */
 684 +       tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
 685 +
 686 +       temp_high_test = (temp_high_orig - 1) & 0x0FFF;
 687 +
 688 +       tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
 689 +
 690 +       tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 691 +
 692 +       if (temp_high != temp_high_test) {
 693 +               result = 0;
 694 +               dev_warn(dev, "selftest failed: %d != %d\n",
 695 +                        temp_high, temp_high_test);
 696 +       }
 697 +
 698 +       /* HW Reset */
 699 +       ts->set_reset(0);
 700 +       msleep(1); /* only 10us required */
 701 +       ts->set_reset(1);
 702 +
 703 +       tsc2005_enable(ts);
 704 +
 705 +       /* Test that reset really happened */
 706 +       tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 707 +
 708 +       if (temp_high != temp_high_orig) {
 709 +               result = 0;
 710 +               dev_warn(dev, "selftest failed after reset: "
 711 +                        "%d != %d\n",
 712 +                        temp_high, temp_high_orig);
 713 +       }
 714 +
 715 +       mutex_unlock(&ts->mutex);
 716 +
 717 +out:
 718 +       return sprintf(buf, "%u\n", result);
 719 +}
 720 +
 721 +static DEVICE_ATTR(ts_ctrl_selftest, S_IRUGO, tsc2005_ctrl_selftest_show, NULL);
 722 +
 723 +static void tsc2005_esd_timer_handler(unsigned long data)
 724 +{
 725 +       struct tsc2005 *ts = (struct tsc2005 *)data;
 726 +       if (!ts->disable_depth)
 727 +               schedule_work(&ts->esd_work);
 728 +}
 729 +
 730 +static void tsc2005_rst_handler(struct work_struct *work)
 731 +{
 732 +       u16 reg_val;
 733 +       struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
 734 +       unsigned long wdj;
 735 +
 736 +       mutex_lock(&ts->mutex);
 737 +
 738 +       /* If we are disabled, or the a touch has been detected,
 739 +        * then ignore this timeout. The enable will restart the
 740 +        * watchdog, as it restarts scanning
 741 +        */
 742 +       if (ts->disable_depth)
 743 +               goto out;
 744 +
 745 +       /* If we cannot read our known value from configuration register 0
 746 +        * then reset the controller as if from power-up and start
 747 +        * scanning again. Always re-arm the watchdog.
 748 +        */
 749 +       tsc2005_read(ts, TSC2005_REG_CFR0, &reg_val);
 750 +       if ((reg_val ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
 751 +               dev_info(&ts->spi->dev, "TSC not responding, resetting.\n");
 752 +               /* If this timer kicked in, the penup timer, if ever active
 753 +                * at all, must have expired ages ago, so no need to del it.
 754 +                */
 755 +               ts->set_reset(0);
 756 +               if (ts->sample_sent) {
 757 +                       tsc2005_ts_update_pen_state(ts, 0, 0, 0);
 758 +                       ts->sample_sent = 0;
 759 +               }
 760 +               ts->spi_pending = 0;
 761 +               msleep(1); /* only 10us required */
 762 +               ts->set_reset(1);
 763 +               tsc2005_start_scan(ts);
 764 +       }
 765 +       wdj = msecs_to_jiffies(ts->esd_timeout);
 766 +       mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
 767 +
 768 +out:
 769 +       mutex_unlock(&ts->mutex);
 770 +}
 771 +
 772 +static int __devinit tsc2005_ts_init(struct tsc2005 *ts,
 773 +                                    struct tsc2005_platform_data *pdata)
 774 +{
 775 +       struct input_dev *idev;
 776 +       int r;
 777 +       int x_max, y_max;
 778 +
 779 +       init_timer(&ts->penup_timer);
 780 +       setup_timer(&ts->penup_timer, tsc2005_ts_penup_timer_handler,
 781 +                       (unsigned long)ts);
 782 +
 783 +       spin_lock_init(&ts->lock);
 784 +       mutex_init(&ts->mutex);
 785 +
 786 +       ts->x_plate_ohm         = pdata->ts_x_plate_ohm ? : 280;
 787 +       ts->hw_avg_max          = pdata->ts_hw_avg;
 788 +       ts->stab_time           = pdata->ts_stab_time;
 789 +       x_max                   = pdata->ts_x_max ? : 4096;
 790 +       ts->fudge_x             = pdata->ts_x_fudge ? : 4;
 791 +       y_max                   = pdata->ts_y_max ? : 4096;
 792 +       ts->fudge_y             = pdata->ts_y_fudge ? : 8;
 793 +       ts->p_max               = pdata->ts_pressure_max ? : MAX_12BIT;
 794 +       ts->touch_pressure      = pdata->ts_touch_pressure ? : ts->p_max;
 795 +       ts->fudge_p             = pdata->ts_pressure_fudge ? : 2;
 796 +
 797 +       ts->set_reset           = pdata->set_reset;
 798 +
 799 +       idev = input_allocate_device();
 800 +       if (idev == NULL) {
 801 +               r = -ENOMEM;
 802 +               goto err1;
 803 +       }
 804 +
 805 +       idev->name = "TSC2005 touchscreen";
 806 +       snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
 807 +                dev_name(&ts->spi->dev));
 808 +       idev->phys = ts->phys;
 809 +
 810 +       idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
 811 +       idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
 812 +       idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 813 +       ts->idev = idev;
 814 +
 815 +       tsc2005_ts_setup_spi_xfer(ts);
 816 +
 817 +       input_set_abs_params(idev, ABS_X, 0, x_max, ts->fudge_x, 0);
 818 +       input_set_abs_params(idev, ABS_Y, 0, y_max, ts->fudge_y, 0);
 819 +       input_set_abs_params(idev, ABS_PRESSURE, 0, ts->p_max, ts->fudge_p, 0);
 820 +
 821 +       tsc2005_start_scan(ts);
 822 +
 823 +       r = request_irq(ts->spi->irq, tsc2005_ts_irq_handler,
 824 +                       (((TSC2005_CFR2_INITVALUE & TSC2005_CFR2_IRQ_MASK) ==
 825 +                         TSC2005_CFR2_IRQ_PENDAV)
 826 +                        ? IRQF_TRIGGER_RISING
 827 +                        : IRQF_TRIGGER_FALLING) |
 828 +                       IRQF_DISABLED, "tsc2005", ts);
 829 +       if (r < 0) {
 830 +               dev_err(&ts->spi->dev, "unable to get DAV IRQ");
 831 +               goto err2;
 832 +       }
 833 +
 834 +       set_irq_wake(ts->spi->irq, 1);
 835 +
 836 +       r = input_register_device(idev);
 837 +       if (r < 0) {
 838 +               dev_err(&ts->spi->dev, "can't register touchscreen device\n");
 839 +               goto err3;
 840 +       }
 841 +
 842 +       /* We can tolerate these failing */
 843 +       r = device_create_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
 844 +       if (r < 0)
 845 +               dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
 846 +                        dev_attr_ts_ctrl_selftest.attr.name, r);
 847 +
 848 +       r = device_create_file(&ts->spi->dev, &dev_attr_pen_down);
 849 +       if (r < 0)
 850 +               dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
 851 +                        dev_attr_pen_down.attr.name, r);
 852 +
 853 +       r = device_create_file(&ts->spi->dev, &dev_attr_disable_ts);
 854 +       if (r < 0)
 855 +               dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
 856 +                        dev_attr_disable_ts.attr.name, r);
 857 +
 858 +       /* Finally, configure and start the optional EDD watchdog. */
 859 +       ts->esd_timeout = pdata->esd_timeout;
 860 +       if (ts->esd_timeout && ts->set_reset) {
 861 +               unsigned long wdj;
 862 +               setup_timer(&ts->esd_timer, tsc2005_esd_timer_handler,
 863 +                           (unsigned long)ts);
 864 +               INIT_WORK(&ts->esd_work, tsc2005_rst_handler);
 865 +               wdj = msecs_to_jiffies(ts->esd_timeout);
 866 +               ts->esd_timer.expires = round_jiffies(jiffies+wdj);
 867 +               add_timer(&ts->esd_timer);
 868 +       }
 869 +
 870 +       return 0;
 871 +err3:
 872 +       free_irq(ts->spi->irq, ts);
 873 +err2:
 874 +       tsc2005_stop_scan(ts);
 875 +       input_free_device(idev);
 876 +err1:
 877 +       return r;
 878 +}
 879 +
 880 +static int __devinit tsc2005_probe(struct spi_device *spi)
 881 +{
 882 +       struct tsc2005                  *ts;
 883 +       struct tsc2005_platform_data    *pdata = spi->dev.platform_data;
 884 +       int r;
 885 +
 886 +       if (spi->irq < 0) {
 887 +               dev_dbg(&spi->dev, "no irq?\n");
 888 +               return -ENODEV;
 889 +       }
 890 +       if (!pdata) {
 891 +               dev_dbg(&spi->dev, "no platform data?\n");
 892 +               return -ENODEV;
 893 +       }
 894 +
 895 +       ts = kzalloc(sizeof(*ts), GFP_KERNEL);
 896 +       if (ts == NULL)
 897 +               return -ENOMEM;
 898 +
 899 +       dev_set_drvdata(&spi->dev, ts);
 900 +       ts->spi = spi;
 901 +       spi->dev.power.power_state = PMSG_ON;
 902 +
 903 +       spi->mode = SPI_MODE_0;
 904 +       spi->bits_per_word = 8;
 905 +       /* The max speed might've been defined by the board-specific
 906 +        * struct */
 907 +       if (!spi->max_speed_hz)
 908 +               spi->max_speed_hz = TSC2005_HZ;
 909 +
 910 +       spi_setup(spi);
 911 +
 912 +       r = tsc2005_ts_init(ts, pdata);
 913 +       if (r)
 914 +               goto err1;
 915 +
 916 +       return 0;
 917 +
 918 +err1:
 919 +       kfree(ts);
 920 +       return r;
 921 +}
 922 +
 923 +static int __devexit tsc2005_remove(struct spi_device *spi)
 924 +{
 925 +       struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
 926 +
 927 +       mutex_lock(&ts->mutex);
 928 +       tsc2005_disable(ts);
 929 +       mutex_unlock(&ts->mutex);
 930 +
 931 +       device_remove_file(&ts->spi->dev, &dev_attr_disable_ts);
 932 +       device_remove_file(&ts->spi->dev, &dev_attr_pen_down);
 933 +       device_remove_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
 934 +
 935 +       free_irq(ts->spi->irq, ts);
 936 +       input_unregister_device(ts->idev);
 937 +
 938 +       if (ts->esd_timeout)
 939 +               del_timer(&ts->esd_timer);
 940 +       kfree(ts);
 941 +
 942 +       return 0;
 943 +}
 944 +
 945 +#ifdef CONFIG_PM
 946 +static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg)
 947 +{
 948 +       struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
 949 +
 950 +       mutex_lock(&ts->mutex);
 951 +       tsc2005_disable(ts);
 952 +       mutex_unlock(&ts->mutex);
 953 +
 954 +       return 0;
 955 +}
 956 +
 957 +static int tsc2005_resume(struct spi_device *spi)
 958 +{
 959 +       struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
 960 +
 961 +       mutex_lock(&ts->mutex);
 962 +       tsc2005_enable(ts);
 963 +       mutex_unlock(&ts->mutex);
 964 +
 965 +       return 0;
 966 +}
 967 +#endif
 968 +
 969 +static struct spi_driver tsc2005_driver = {
 970 +       .driver = {
 971 +               .name = "tsc2005",
 972 +               .owner = THIS_MODULE,
 973 +       },
 974 +#ifdef CONFIG_PM
 975 +       .suspend = tsc2005_suspend,
 976 +       .resume = tsc2005_resume,
 977 +#endif
 978 +       .probe = tsc2005_probe,
 979 +       .remove = __devexit_p(tsc2005_remove),
 980 +};
 981 +
 982 +static int __init tsc2005_init(void)
 983 +{
 984 +       printk(KERN_INFO "TSC2005 driver initializing\n");
 985 +
 986 +       return spi_register_driver(&tsc2005_driver);
 987 +}
 988 +module_init(tsc2005_init);
 989 +
 990 +static void __exit tsc2005_exit(void)
 991 +{
 992 +       spi_unregister_driver(&tsc2005_driver);
 993 +}
 994 +module_exit(tsc2005_exit);
 995 +
 996 +MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
 997 +MODULE_LICENSE("GPL");
 998 +MODULE_ALIAS("platform:tsc2005");
 999 --- /dev/null
1000 +++ b/include/linux/spi/tsc2005.h
1001 @@ -0,0 +1,30 @@
1002 +#ifndef _LINUX_SPI_TSC2005_H
1003 +#define _LINUX_SPI_TSC2005_H
1004 +
1005 +#include <linux/types.h>
1006 +
1007 +struct tsc2005_platform_data {
1008 +       u16     ts_x_plate_ohm;
1009 +       u32     ts_stab_time;   /* voltage settling time */
1010 +       u8      ts_hw_avg;      /* HW assiseted averaging. Can be
1011 +                                  0, 4, 8, 16 samples per reading */
1012 +       u32     ts_touch_pressure;      /* Pressure limit until we report a
1013 +                                          touch event. After that we switch
1014 +                                          to ts_max_pressure. */
1015 +       u32     ts_pressure_max;/* Samples with bigger pressure value will
1016 +                                  be ignored, since the corresponding X, Y
1017 +                                  values are unreliable */
1018 +       u32     ts_pressure_fudge;
1019 +       u32     ts_x_max;
1020 +       u32     ts_x_fudge;
1021 +       u32     ts_y_max;
1022 +       u32     ts_y_fudge;
1023 +
1024 +       u32     esd_timeout;    /* msec of inactivity before we check */
1025 +
1026 +       unsigned ts_ignore_last:1;
1027 +
1028 +       void (*set_reset)(bool enable);
1029 +};
1030 +
1031 +#endif