target/linux/omap24xx/patches-2.6.37/600-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 Index: linux-2.6.37-rc1/drivers/input/touchscreen/Kconfig
   9 ===================================================================
  10 --- linux-2.6.37-rc1.orig/drivers/input/touchscreen/Kconfig     2010-11-01 12:54:12.000000000 +0100
  11 +++ linux-2.6.37-rc1/drivers/input/touchscreen/Kconfig  2010-11-05 17:04:55.412000001 +0100
  12 @@ -629,6 +629,17 @@
  13           To compile this driver as a module, choose M here: the
  14           module will be called touchit213.
  15
  16 +config TOUCHSCREEN_TSC2005
  17 +        tristate "TSC2005 based touchscreens"
  18 +        depends on SPI_MASTER
  19 +        help
  20 +          Say Y here if you have a TSC2005 based touchscreen.
  21 +
  22 +         If unsure, say N.
  23 +
  24 +         To compile this driver as a module, choose M here: the
  25 +         module will be called tsc2005.
  26 +
  27  config TOUCHSCREEN_TSC2007
  28         tristate "TSC2007 based touchscreens"
  29         depends on I2C
  30 Index: linux-2.6.37-rc1/drivers/input/touchscreen/Makefile
  31 ===================================================================
  32 --- linux-2.6.37-rc1.orig/drivers/input/touchscreen/Makefile    2010-11-01 12:54:12.000000000 +0100
  33 +++ linux-2.6.37-rc1/drivers/input/touchscreen/Makefile 2010-11-05 17:04:55.412000001 +0100
  34 @@ -44,6 +44,7 @@
  35  obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213)   += touchit213.o
  36  obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)   += touchright.o
  37  obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)     += touchwin.o
  38 +obj-$(CONFIG_TOUCHSCREEN_TSC2005)      += tsc2005.o
  39  obj-$(CONFIG_TOUCHSCREEN_TSC2007)      += tsc2007.o
  40  obj-$(CONFIG_TOUCHSCREEN_UCB1400)      += ucb1400_ts.o
  41  obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001)  += wacom_w8001.o
  42 Index: linux-2.6.37-rc1/drivers/input/touchscreen/tsc2005.c
  43 ===================================================================
  44 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  45 +++ linux-2.6.37-rc1/drivers/input/touchscreen/tsc2005.c        2010-11-05 17:04:55.413000001 +0100
  46 @@ -0,0 +1,958 @@
  47 +/*
  48 + * TSC2005 touchscreen driver
  49 + *
  50 + * Copyright (C) 2006-2008 Nokia Corporation
  51 + *
  52 + * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
  53 + * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
  54 + *
  55 + * This program is free software; you can redistribute it and/or modify
  56 + * it under the terms of the GNU General Public License as published by
  57 + * the Free Software Foundation; either version 2 of the License, or
  58 + * (at your option) any later version.
  59 + *
  60 + * This program is distributed in the hope that it will be useful,
  61 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  62 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  63 + * GNU General Public License for more details.
  64 + *
  65 + * You should have received a copy of the GNU General Public License
  66 + * along with this program; if not, write to the Free Software
  67 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  68 + *
  69 + */
  70 +
  71 +#include <linux/kernel.h>
  72 +#include <linux/module.h>
  73 +#include <linux/input.h>
  74 +#include <linux/interrupt.h>
  75 +#include <linux/delay.h>
  76 +#include <linux/spi/spi.h>
  77 +
  78 +#include <linux/spi/tsc2005.h>
  79 +
  80 +/**
  81 + * The touchscreen interface operates as follows:
  82 + *
  83 + * Initialize:
  84 + *    Request access to GPIO103 (DAV)
  85 + *    tsc2005_ts_irq_handler will trigger when DAV line goes down
  86 + *
  87 + *  1) Pen is pressed against touchscreeen
  88 + *  2) TSC2005 performs AD conversion
  89 + *  3) After the conversion is done TSC2005 drives DAV line down
  90 + *  4) GPIO IRQ is received and tsc2005_ts_irq_handler is called
  91 + *  5) tsc2005_ts_irq_handler queues up an spi transfer to fetch
  92 + *     the x, y, z1, z2 values
  93 + *  6) tsc2005_ts_rx() reports coordinates to input layer and
  94 + *     sets up tsc2005_ts_timer() to be called after TSC2005_TS_SCAN_TIME
  95 + *  7)  When the penup_timer expires, there have not been DAV interrupts
  96 + *     during the last 20ms which means the pen has been lifted.
  97 + */
  98 +
  99 +#define TSC2005_VDD_LOWER_27
 100 +
 101 +#ifdef TSC2005_VDD_LOWER_27
 102 +#define TSC2005_HZ     (10000000)
 103 +#else
 104 +#define TSC2005_HZ     (25000000)
 105 +#endif
 106 +
 107 +#define TSC2005_CMD    (0x80)
 108 +#define TSC2005_REG    (0x00)
 109 +
 110 +#define TSC2005_CMD_STOP       (1)
 111 +#define TSC2005_CMD_10BIT      (0 << 2)
 112 +#define TSC2005_CMD_12BIT      (1 << 2)
 113 +
 114 +#define TSC2005_CMD_SCAN_XYZZ  (0 << 3)
 115 +#define TSC2005_CMD_SCAN_XY    (1 << 3)
 116 +#define TSC2005_CMD_SCAN_X     (2 << 3)
 117 +#define TSC2005_CMD_SCAN_Y     (3 << 3)
 118 +#define TSC2005_CMD_SCAN_ZZ    (4 << 3)
 119 +#define TSC2005_CMD_AUX_SINGLE (5 << 3)
 120 +#define TSC2005_CMD_TEMP1      (6 << 3)
 121 +#define TSC2005_CMD_TEMP2      (7 << 3)
 122 +#define TSC2005_CMD_AUX_CONT   (8 << 3)
 123 +#define TSC2005_CMD_TEST_X_CONN        (9 << 3)
 124 +#define TSC2005_CMD_TEST_Y_CONN        (10 << 3)
 125 +#define TSC2005_CMD_TEST_SHORT (11 << 3)
 126 +/* command 12 reserved, according to 2008-03 erratum */
 127 +#define TSC2005_CMD_DRIVE_XX   (13 << 3)
 128 +#define TSC2005_CMD_DRIVE_YY   (14 << 3)
 129 +#define TSC2005_CMD_DRIVE_YX   (15 << 3)
 130 +
 131 +#define TSC2005_REG_X          (0 << 3)
 132 +#define TSC2005_REG_Y          (1 << 3)
 133 +#define TSC2005_REG_Z1         (2 << 3)
 134 +#define TSC2005_REG_Z2         (3 << 3)
 135 +#define TSC2005_REG_AUX                (4 << 3)
 136 +#define TSC2005_REG_TEMP1      (5 << 3)
 137 +#define TSC2005_REG_TEMP2      (6 << 3)
 138 +#define TSC2005_REG_STATUS     (7 << 3)
 139 +#define TSC2005_REG_AUX_HIGH   (8 << 3)
 140 +#define TSC2005_REG_AUX_LOW    (9 << 3)
 141 +#define TSC2005_REG_TEMP_HIGH  (10 << 3)
 142 +#define TSC2005_REG_TEMP_LOW   (11 << 3)
 143 +#define TSC2005_REG_CFR0       (12 << 3)
 144 +#define TSC2005_REG_CFR1       (13 << 3)
 145 +#define TSC2005_REG_CFR2       (14 << 3)
 146 +#define TSC2005_REG_FUNCTION   (15 << 3)
 147 +
 148 +#define TSC2005_REG_PND0       (1 << 1)
 149 +#define TSC2005_REG_READ       (0x01)
 150 +#define TSC2005_REG_WRITE      (0x00)
 151 +
 152 +
 153 +#define TSC2005_CFR0_LONGSAMPLING      (1)
 154 +#define TSC2005_CFR0_DETECTINWAIT      (1 << 1)
 155 +#define TSC2005_CFR0_SENSETIME_32US    (0)
 156 +#define TSC2005_CFR0_SENSETIME_96US    (1 << 2)
 157 +#define TSC2005_CFR0_SENSETIME_544US   (1 << 3)
 158 +#define TSC2005_CFR0_SENSETIME_2080US  (1 << 4)
 159 +#define TSC2005_CFR0_SENSETIME_2656US  (0x001C)
 160 +#define TSC2005_CFR0_PRECHARGE_20US    (0x0000)
 161 +#define TSC2005_CFR0_PRECHARGE_84US    (0x0020)
 162 +#define TSC2005_CFR0_PRECHARGE_276US   (0x0040)
 163 +#define TSC2005_CFR0_PRECHARGE_1044US  (0x0080)
 164 +#define TSC2005_CFR0_PRECHARGE_1364US  (0x00E0)
 165 +#define TSC2005_CFR0_STABTIME_0US      (0x0000)
 166 +#define TSC2005_CFR0_STABTIME_100US    (0x0100)
 167 +#define TSC2005_CFR0_STABTIME_500US    (0x0200)
 168 +#define TSC2005_CFR0_STABTIME_1MS      (0x0300)
 169 +#define TSC2005_CFR0_STABTIME_5MS      (0x0400)
 170 +#define TSC2005_CFR0_STABTIME_100MS    (0x0700)
 171 +#define TSC2005_CFR0_CLOCK_4MHZ                (0x0000)
 172 +#define TSC2005_CFR0_CLOCK_2MHZ                (0x0800)
 173 +#define TSC2005_CFR0_CLOCK_1MHZ                (0x1000)
 174 +#define TSC2005_CFR0_RESOLUTION12      (0x2000)
 175 +#define TSC2005_CFR0_STATUS            (0x4000)
 176 +#define TSC2005_CFR0_PENMODE           (0x8000)
 177 +
 178 +#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS  |   \
 179 +                                TSC2005_CFR0_CLOCK_1MHZ    |   \
 180 +                                TSC2005_CFR0_RESOLUTION12  |   \
 181 +                                TSC2005_CFR0_PRECHARGE_276US | \
 182 +                                TSC2005_CFR0_PENMODE)
 183 +
 184 +/* Bits common to both read and write of config register 0 */
 185 +#define        TSC2005_CFR0_RW_MASK    0x3fff
 186 +
 187 +#define TSC2005_CFR1_BATCHDELAY_0MS    (0x0000)
 188 +#define TSC2005_CFR1_BATCHDELAY_1MS    (0x0001)
 189 +#define TSC2005_CFR1_BATCHDELAY_2MS    (0x0002)
 190 +#define TSC2005_CFR1_BATCHDELAY_4MS    (0x0003)
 191 +#define TSC2005_CFR1_BATCHDELAY_10MS   (0x0004)
 192 +#define TSC2005_CFR1_BATCHDELAY_20MS   (0x0005)
 193 +#define TSC2005_CFR1_BATCHDELAY_40MS   (0x0006)
 194 +#define TSC2005_CFR1_BATCHDELAY_100MS  (0x0007)
 195 +
 196 +#define TSC2005_CFR1_INITVALUE (TSC2005_CFR1_BATCHDELAY_4MS)
 197 +
 198 +#define TSC2005_CFR2_MAVE_TEMP (0x0001)
 199 +#define TSC2005_CFR2_MAVE_AUX  (0x0002)
 200 +#define TSC2005_CFR2_MAVE_Z    (0x0004)
 201 +#define TSC2005_CFR2_MAVE_Y    (0x0008)
 202 +#define TSC2005_CFR2_MAVE_X    (0x0010)
 203 +#define TSC2005_CFR2_AVG_1     (0x0000)
 204 +#define TSC2005_CFR2_AVG_3     (0x0400)
 205 +#define TSC2005_CFR2_AVG_7     (0x0800)
 206 +#define TSC2005_CFR2_MEDIUM_1  (0x0000)
 207 +#define TSC2005_CFR2_MEDIUM_3  (0x1000)
 208 +#define TSC2005_CFR2_MEDIUM_7  (0x2000)
 209 +#define TSC2005_CFR2_MEDIUM_15 (0x3000)
 210 +
 211 +#define TSC2005_CFR2_IRQ_MASK   (0xC000)
 212 +#define TSC2005_CFR2_IRQ_DAV   (0x4000)
 213 +#define TSC2005_CFR2_IRQ_PEN   (0x8000)
 214 +#define TSC2005_CFR2_IRQ_PENDAV        (0x0000)
 215 +
 216 +#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_IRQ_PENDAV |      \
 217 +                                TSC2005_CFR2_MAVE_X    |       \
 218 +                                TSC2005_CFR2_MAVE_Y    |       \
 219 +                                TSC2005_CFR2_MAVE_Z    |       \
 220 +                                TSC2005_CFR2_MEDIUM_15 |       \
 221 +                                TSC2005_CFR2_AVG_7)
 222 +
 223 +#define MAX_12BIT                                      ((1 << 12) - 1)
 224 +#define TS_SAMPLES                                     4
 225 +#define TSC2005_TS_PENUP_TIME                          40
 226 +
 227 +static const u32 tsc2005_read_reg[] = {
 228 +       (TSC2005_REG | TSC2005_REG_X | TSC2005_REG_READ) << 16,
 229 +       (TSC2005_REG | TSC2005_REG_Y | TSC2005_REG_READ) << 16,
 230 +       (TSC2005_REG | TSC2005_REG_Z1 | TSC2005_REG_READ) << 16,
 231 +       (TSC2005_REG | TSC2005_REG_Z2 | TSC2005_REG_READ) << 16,
 232 +};
 233 +#define NUM_READ_REGS  (sizeof(tsc2005_read_reg)/sizeof(tsc2005_read_reg[0]))
 234 +
 235 +struct tsc2005 {
 236 +       struct spi_device       *spi;
 237 +
 238 +       struct input_dev        *idev;
 239 +       char                    phys[32];
 240 +       struct timer_list       penup_timer;
 241 +
 242 +       /* ESD recovery via a hardware reset if the tsc2005
 243 +        * doesn't respond after a configurable period (in ms) of
 244 +        * IRQ/SPI inactivity. If esd_timeout is 0, timer and work
 245 +        * fields are used.
 246 +        */
 247 +       u32                     esd_timeout;
 248 +       struct timer_list       esd_timer;
 249 +       struct work_struct      esd_work;
 250 +
 251 +       spinlock_t              lock;
 252 +       struct mutex            mutex;
 253 +
 254 +       struct spi_message      read_msg;
 255 +       struct spi_transfer     read_xfer[NUM_READ_REGS];
 256 +       u32                     data[NUM_READ_REGS];
 257 +
 258 +       /* previously reported x,y,p (if pen_down) */
 259 +       int                     out_x;
 260 +       int                     out_y;
 261 +       int                     out_p;
 262 +       /* fudge parameters - changes must exceed one of these. */
 263 +       int                     fudge_x;
 264 +       int                     fudge_y;
 265 +       int                     fudge_p;
 266 +       /* raw copy of previous x,y,z */
 267 +       int                     in_x;
 268 +       int                     in_y;
 269 +       int                     in_z1;
 270 +       int                     in_z2;
 271 +       /* average accumulators for each component */
 272 +       int                     sample_cnt;
 273 +       int                     avg_x;
 274 +       int                     avg_y;
 275 +       int                     avg_z1;
 276 +       int                     avg_z2;
 277 +       /* configuration */
 278 +       int                     x_plate_ohm;
 279 +       int                     hw_avg_max;
 280 +       int                     stab_time;
 281 +       int                     p_max;
 282 +       int                     touch_pressure;
 283 +       /* status */
 284 +       u8                      sample_sent;
 285 +       u8                      pen_down;
 286 +       u8                      disabled;
 287 +       u8                      disable_depth;
 288 +       u8                      spi_pending;
 289 +
 290 +       void (*set_reset)(bool enable);
 291 +};
 292 +
 293 +static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
 294 +{
 295 +       u8 data = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
 296 +       struct spi_message msg;
 297 +       struct spi_transfer xfer = { 0 };
 298 +
 299 +       xfer.tx_buf = &data;
 300 +       xfer.rx_buf = NULL;
 301 +       xfer.len = 1;
 302 +       xfer.bits_per_word = 8;
 303 +
 304 +       spi_message_init(&msg);
 305 +       spi_message_add_tail(&xfer, &msg);
 306 +       spi_sync(ts->spi, &msg);
 307 +}
 308 +
 309 +static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
 310 +{
 311 +       u32 tx;
 312 +       struct spi_message msg;
 313 +       struct spi_transfer xfer = { 0 };
 314 +
 315 +       tx = (TSC2005_REG | reg | TSC2005_REG_PND0 |
 316 +              TSC2005_REG_WRITE) << 16;
 317 +       tx |= value;
 318 +
 319 +       xfer.tx_buf = &tx;
 320 +       xfer.rx_buf = NULL;
 321 +       xfer.len = 4;
 322 +       xfer.bits_per_word = 24;
 323 +
 324 +       spi_message_init(&msg);
 325 +       spi_message_add_tail(&xfer, &msg);
 326 +       spi_sync(ts->spi, &msg);
 327 +}
 328 +
 329 +static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
 330 +{
 331 +       u32 tx;
 332 +       u32 rx = 0;
 333 +       struct spi_message msg;
 334 +       struct spi_transfer xfer = { 0 };
 335 +
 336 +       tx = (TSC2005_REG | reg | TSC2005_REG_READ) << 16;
 337 +
 338 +       xfer.tx_buf = &tx;
 339 +       xfer.rx_buf = &rx;
 340 +       xfer.len = 4;
 341 +       xfer.bits_per_word = 24;
 342 +
 343 +       spi_message_init(&msg);
 344 +       spi_message_add_tail(&xfer, &msg);
 345 +       spi_sync(ts->spi, &msg);
 346 +       *value = rx;
 347 +}
 348 +
 349 +static void tsc2005_ts_update_pen_state(struct tsc2005 *ts,
 350 +                                       int x, int y, int pressure)
 351 +{
 352 +       if (pressure) {
 353 +               input_report_abs(ts->idev, ABS_X, x);
 354 +               input_report_abs(ts->idev, ABS_Y, y);
 355 +               input_report_abs(ts->idev, ABS_PRESSURE, pressure);
 356 +               if (!ts->pen_down) {
 357 +                       input_report_key(ts->idev, BTN_TOUCH, 1);
 358 +                       ts->pen_down = 1;
 359 +               }
 360 +       } else {
 361 +               input_report_abs(ts->idev, ABS_PRESSURE, 0);
 362 +               if (ts->pen_down) {
 363 +                       input_report_key(ts->idev, BTN_TOUCH, 0);
 364 +                       ts->pen_down = 0;
 365 +               }
 366 +       }
 367 +
 368 +       input_sync(ts->idev);
 369 +}
 370 +
 371 +/*
 372 + * This function is called by the SPI framework after the coordinates
 373 + * have been read from TSC2005
 374 + */
 375 +static void tsc2005_ts_rx(void *arg)
 376 +{
 377 +       struct tsc2005 *ts = arg;
 378 +       unsigned long flags;
 379 +       int inside_rect, pressure_limit;
 380 +       int x, y, z1, z2, pressure;
 381 +
 382 +       spin_lock_irqsave(&ts->lock, flags);
 383 +
 384 +       if (ts->disable_depth) {
 385 +               ts->spi_pending = 0;
 386 +               goto out;
 387 +       }
 388 +
 389 +       x = ts->data[0];
 390 +       y = ts->data[1];
 391 +       z1 = ts->data[2];
 392 +       z2 = ts->data[3];
 393 +
 394 +       /* validate pressure and position */
 395 +       if (x > MAX_12BIT || y > MAX_12BIT)
 396 +               goto out;
 397 +
 398 +       /* skip coords if the pressure-components are out of range */
 399 +       if (z1 < 100 || z2 > MAX_12BIT || z1 >= z2)
 400 +               goto out;
 401 +
 402 +       /* skip point if this is a pen down with the exact same values as
 403 +        * the value before pen-up - that implies SPI fed us stale data
 404 +        */
 405 +       if (!ts->pen_down &&
 406 +           ts->in_x == x &&
 407 +           ts->in_y == y &&
 408 +           ts->in_z1 == z1 &&
 409 +           ts->in_z2 == z2)
 410 +               goto out;
 411 +
 412 +       /* At this point we are happy we have a valid and useful reading.
 413 +        * Remember it for later comparisons. We may now begin downsampling
 414 +        */
 415 +       ts->in_x = x;
 416 +       ts->in_y = y;
 417 +       ts->in_z1 = z1;
 418 +       ts->in_z2 = z2;
 419 +
 420 +       /* don't run average on the "pen down" event */
 421 +       if (ts->sample_sent) {
 422 +               ts->avg_x += x;
 423 +               ts->avg_y += y;
 424 +               ts->avg_z1 += z1;
 425 +               ts->avg_z2 += z2;
 426 +
 427 +               if (++ts->sample_cnt < TS_SAMPLES)
 428 +                       goto out;
 429 +
 430 +               x = ts->avg_x / TS_SAMPLES;
 431 +               y = ts->avg_y / TS_SAMPLES;
 432 +               z1 = ts->avg_z1 / TS_SAMPLES;
 433 +               z2 = ts->avg_z2 / TS_SAMPLES;
 434 +       }
 435 +
 436 +       ts->sample_cnt = 0;
 437 +       ts->avg_x = 0;
 438 +       ts->avg_y = 0;
 439 +       ts->avg_z1 = 0;
 440 +       ts->avg_z2 = 0;
 441 +
 442 +       pressure = x * (z2 - z1) / z1;
 443 +       pressure = pressure * ts->x_plate_ohm / 4096;
 444 +
 445 +       pressure_limit = ts->sample_sent ? ts->p_max : ts->touch_pressure;
 446 +       if (pressure > pressure_limit)
 447 +               goto out;
 448 +
 449 +       /* Discard the event if it still is within the previous rect -
 450 +        * unless the pressure is clearly harder, but then use previous
 451 +        * x,y position. If any coordinate deviates enough, fudging
 452 +        * of all three will still take place in the input layer.
 453 +        */
 454 +       inside_rect = (ts->sample_sent &&
 455 +               x > (int)ts->out_x - ts->fudge_x &&
 456 +               x < (int)ts->out_x + ts->fudge_x &&
 457 +               y > (int)ts->out_y - ts->fudge_y &&
 458 +               y < (int)ts->out_y + ts->fudge_y);
 459 +       if (inside_rect)
 460 +               x = ts->out_x, y = ts->out_y;
 461 +
 462 +       if (!inside_rect || pressure < (ts->out_p - ts->fudge_p)) {
 463 +               tsc2005_ts_update_pen_state(ts, x, y, pressure);
 464 +               ts->sample_sent = 1;
 465 +               ts->out_x = x;
 466 +               ts->out_y = y;
 467 +               ts->out_p = pressure;
 468 +       }
 469 +out:
 470 +       if (ts->spi_pending > 1) {
 471 +               /* One or more interrupts (sometimes several dozens)
 472 +                * occured while waiting for the SPI read - get
 473 +                * another read going.
 474 +                */
 475 +               ts->spi_pending = 1;
 476 +               if (spi_async(ts->spi, &ts->read_msg)) {
 477 +                       dev_err(&ts->spi->dev, "ts: spi_async() failed");
 478 +                       ts->spi_pending = 0;
 479 +               }
 480 +       } else
 481 +               ts->spi_pending = 0;
 482 +
 483 +       /* kick pen up timer - to make sure it expires again(!) */
 484 +       if (ts->sample_sent) {
 485 +               mod_timer(&ts->penup_timer,
 486 +                         jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME));
 487 +               /* Also kick the watchdog, as we still think we're alive */
 488 +               if (ts->esd_timeout && ts->disable_depth == 0) {
 489 +                       unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
 490 +                       mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
 491 +               }
 492 +       }
 493 +       spin_unlock_irqrestore(&ts->lock, flags);
 494 +}
 495 +
 496 +/* This penup timer is very forgiving of delayed SPI reads. The
 497 + * (ESD) watchdog will rescue us if spi_pending remains set, unless
 498 + * we are enterring the disabled state. In that case we must just
 499 + * handle the pen up, and let disabling complete.
 500 + */
 501 +static void tsc2005_ts_penup_timer_handler(unsigned long data)
 502 +{
 503 +       struct tsc2005 *ts = (struct tsc2005 *)data;
 504 +       if ((!ts->spi_pending || ts->disable_depth) &&
 505 +           ts->sample_sent) {
 506 +               tsc2005_ts_update_pen_state(ts, 0, 0, 0);
 507 +               ts->sample_sent = 0;
 508 +       }
 509 +}
 510 +
 511 +/*
 512 + * This interrupt is called when pen is down and coordinates are
 513 + * available. That is indicated by a either:
 514 + * a) a rising edge on PINTDAV or (PENDAV mode)
 515 + * b) a falling edge on DAV line (DAV mode)
 516 + * depending on the setting of the IRQ bits in the CFR2 setting above.
 517 + */
 518 +static irqreturn_t tsc2005_ts_irq_handler(int irq, void *dev_id)
 519 +{
 520 +       struct tsc2005 *ts = dev_id;
 521 +       if (ts->disable_depth)
 522 +               goto out;
 523 +
 524 +       if (!ts->spi_pending) {
 525 +               if (spi_async(ts->spi, &ts->read_msg)) {
 526 +                       dev_err(&ts->spi->dev, "ts: spi_async() failed");
 527 +                       goto out;
 528 +               }
 529 +       }
 530 +       /* By shifting in 1s we can never wrap */
 531 +       ts->spi_pending = (ts->spi_pending<<1)+1;
 532 +
 533 +       /* Kick pen up timer only if it's not been started yet. Strictly,
 534 +        * it isn't even necessary to start it at all here,  but doing so
 535 +        * keeps an equivalence between pen state and timer state.
 536 +        * The SPI read loop will keep pushing it into the future.
 537 +        * If it times out with an SPI pending, it's ignored anyway.
 538 +        */
 539 +       if (!timer_pending(&ts->penup_timer)) {
 540 +               unsigned long pu = msecs_to_jiffies(TSC2005_TS_PENUP_TIME);
 541 +               ts->penup_timer.expires = jiffies + pu;
 542 +               add_timer(&ts->penup_timer);
 543 +       }
 544 +out:
 545 +       return IRQ_HANDLED;
 546 +}
 547 +
 548 +static void tsc2005_ts_setup_spi_xfer(struct tsc2005 *ts)
 549 +{
 550 +       struct spi_message *m = &ts->read_msg;
 551 +       struct spi_transfer *x = &ts->read_xfer[0];
 552 +       int i;
 553 +
 554 +       spi_message_init(m);
 555 +
 556 +       for (i = 0; i < NUM_READ_REGS; i++, x++) {
 557 +               x->tx_buf = &tsc2005_read_reg[i];
 558 +               x->rx_buf = &ts->data[i];
 559 +               x->len = 4;
 560 +               x->bits_per_word = 24;
 561 +               x->cs_change = i < (NUM_READ_REGS - 1);
 562 +               spi_message_add_tail(x, m);
 563 +       }
 564 +
 565 +       m->complete = tsc2005_ts_rx;
 566 +       m->context = ts;
 567 +}
 568 +
 569 +static ssize_t tsc2005_ts_pen_down_show(struct device *dev,
 570 +                                       struct device_attribute *attr,
 571 +                                       char *buf)
 572 +{
 573 +       struct tsc2005 *ts = dev_get_drvdata(dev);
 574 +
 575 +       return sprintf(buf, "%u\n", ts->pen_down);
 576 +}
 577 +
 578 +static DEVICE_ATTR(pen_down, S_IRUGO, tsc2005_ts_pen_down_show, NULL);
 579 +
 580 +static int tsc2005_configure(struct tsc2005 *ts, int flags)
 581 +{
 582 +       tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
 583 +       tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
 584 +       tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
 585 +       tsc2005_cmd(ts, flags);
 586 +
 587 +       return 0;
 588 +}
 589 +
 590 +static void tsc2005_start_scan(struct tsc2005 *ts)
 591 +{
 592 +       tsc2005_configure(ts, TSC2005_CMD_SCAN_XYZZ);
 593 +}
 594 +
 595 +static void tsc2005_stop_scan(struct tsc2005 *ts)
 596 +{
 597 +       tsc2005_cmd(ts, TSC2005_CMD_STOP);
 598 +}
 599 +
 600 +/* Must be called with mutex held */
 601 +static void tsc2005_disable(struct tsc2005 *ts)
 602 +{
 603 +       if (ts->disable_depth++ != 0)
 604 +               return;
 605 +
 606 +       disable_irq(ts->spi->irq);
 607 +       if (ts->esd_timeout)
 608 +               del_timer(&ts->esd_timer);
 609 +
 610 +       /* wait until penup timer expire normally */
 611 +       do {
 612 +               msleep(4);
 613 +       } while (ts->sample_sent);
 614 +
 615 +       tsc2005_stop_scan(ts);
 616 +}
 617 +
 618 +static void tsc2005_enable(struct tsc2005 *ts)
 619 +{
 620 +       if (ts->disable_depth != 1)
 621 +               goto out;
 622 +
 623 +       if (ts->esd_timeout) {
 624 +               unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
 625 +               ts->esd_timer.expires = round_jiffies(jiffies+wdj);
 626 +               add_timer(&ts->esd_timer);
 627 +       }
 628 +       tsc2005_start_scan(ts);
 629 +       enable_irq(ts->spi->irq);
 630 +out:
 631 +       --ts->disable_depth;
 632 +}
 633 +
 634 +static ssize_t tsc2005_disable_show(struct device *dev,
 635 +                                   struct device_attribute *attr, char *buf)
 636 +{
 637 +       struct tsc2005 *ts = dev_get_drvdata(dev);
 638 +
 639 +       return sprintf(buf, "%u\n", ts->disabled);
 640 +}
 641 +
 642 +static ssize_t tsc2005_disable_store(struct device *dev,
 643 +                                    struct device_attribute *attr,
 644 +                                    const char *buf, size_t count)
 645 +{
 646 +       struct tsc2005          *ts = dev_get_drvdata(dev);
 647 +       unsigned long res;
 648 +       int i;
 649 +
 650 +       if (strict_strtoul(buf, 10, &res) < 0)
 651 +               return -EINVAL;
 652 +       i = res ? 1 : 0;
 653 +
 654 +       mutex_lock(&ts->mutex);
 655 +       if (i == ts->disabled)
 656 +               goto out;
 657 +       ts->disabled = i;
 658 +
 659 +       if (i)
 660 +               tsc2005_disable(ts);
 661 +       else
 662 +               tsc2005_enable(ts);
 663 +out:
 664 +       mutex_unlock(&ts->mutex);
 665 +       return count;
 666 +}
 667 +
 668 +static DEVICE_ATTR(disable_ts, 0664, tsc2005_disable_show,
 669 +                  tsc2005_disable_store);
 670 +
 671 +static ssize_t tsc2005_ctrl_selftest_show(struct device *dev,
 672 +                                         struct device_attribute *attr,
 673 +                                         char *buf)
 674 +{
 675 +       u16 temp_high_orig, temp_high_test, temp_high;
 676 +       unsigned int result = 1;
 677 +       struct tsc2005 *ts = dev_get_drvdata(dev);
 678 +
 679 +       if (!ts->set_reset) {
 680 +               dev_warn(&ts->spi->dev,
 681 +                        "unable to selftest: reset not configured\n");
 682 +               result = 0;
 683 +               goto out;
 684 +       }
 685 +
 686 +       mutex_lock(&ts->mutex);
 687 +       tsc2005_disable(ts);
 688 +
 689 +       /* Test ctrl communications via temp high / low registers */
 690 +       tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
 691 +
 692 +       temp_high_test = (temp_high_orig - 1) & 0x0FFF;
 693 +
 694 +       tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
 695 +
 696 +       tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 697 +
 698 +       if (temp_high != temp_high_test) {
 699 +               result = 0;
 700 +               dev_warn(dev, "selftest failed: %d != %d\n",
 701 +                        temp_high, temp_high_test);
 702 +       }
 703 +
 704 +       /* HW Reset */
 705 +       ts->set_reset(0);
 706 +       msleep(1); /* only 10us required */
 707 +       ts->set_reset(1);
 708 +
 709 +       tsc2005_enable(ts);
 710 +
 711 +       /* Test that reset really happened */
 712 +       tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
 713 +
 714 +       if (temp_high != temp_high_orig) {
 715 +               result = 0;
 716 +               dev_warn(dev, "selftest failed after reset: "
 717 +                        "%d != %d\n",
 718 +                        temp_high, temp_high_orig);
 719 +       }
 720 +
 721 +       mutex_unlock(&ts->mutex);
 722 +
 723 +out:
 724 +       return sprintf(buf, "%u\n", result);
 725 +}
 726 +
 727 +static DEVICE_ATTR(ts_ctrl_selftest, S_IRUGO, tsc2005_ctrl_selftest_show, NULL);
 728 +
 729 +static void tsc2005_esd_timer_handler(unsigned long data)
 730 +{
 731 +       struct tsc2005 *ts = (struct tsc2005 *)data;
 732 +       if (!ts->disable_depth)
 733 +               schedule_work(&ts->esd_work);
 734 +}
 735 +
 736 +static void tsc2005_rst_handler(struct work_struct *work)
 737 +{
 738 +       u16 reg_val;
 739 +       struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
 740 +       unsigned long wdj;
 741 +
 742 +       mutex_lock(&ts->mutex);
 743 +
 744 +       /* If we are disabled, or the a touch has been detected,
 745 +        * then ignore this timeout. The enable will restart the
 746 +        * watchdog, as it restarts scanning
 747 +        */
 748 +       if (ts->disable_depth)
 749 +               goto out;
 750 +
 751 +       /* If we cannot read our known value from configuration register 0
 752 +        * then reset the controller as if from power-up and start
 753 +        * scanning again. Always re-arm the watchdog.
 754 +        */
 755 +       tsc2005_read(ts, TSC2005_REG_CFR0, &reg_val);
 756 +       if ((reg_val ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
 757 +               dev_info(&ts->spi->dev, "TSC not responding, resetting.\n");
 758 +               /* If this timer kicked in, the penup timer, if ever active
 759 +                * at all, must have expired ages ago, so no need to del it.
 760 +                */
 761 +               ts->set_reset(0);
 762 +               if (ts->sample_sent) {
 763 +                       tsc2005_ts_update_pen_state(ts, 0, 0, 0);
 764 +                       ts->sample_sent = 0;
 765 +               }
 766 +               ts->spi_pending = 0;
 767 +               msleep(1); /* only 10us required */
 768 +               ts->set_reset(1);
 769 +               tsc2005_start_scan(ts);
 770 +       }
 771 +       wdj = msecs_to_jiffies(ts->esd_timeout);
 772 +       mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
 773 +
 774 +out:
 775 +       mutex_unlock(&ts->mutex);
 776 +}
 777 +
 778 +static int __devinit tsc2005_ts_init(struct tsc2005 *ts,
 779 +                                    struct tsc2005_platform_data *pdata)
 780 +{
 781 +       struct input_dev *idev;
 782 +       int r;
 783 +       int x_max, y_max;
 784 +
 785 +       init_timer(&ts->penup_timer);
 786 +       setup_timer(&ts->penup_timer, tsc2005_ts_penup_timer_handler,
 787 +                       (unsigned long)ts);
 788 +
 789 +       spin_lock_init(&ts->lock);
 790 +       mutex_init(&ts->mutex);
 791 +
 792 +       ts->x_plate_ohm         = pdata->ts_x_plate_ohm ? : 280;
 793 +       ts->hw_avg_max          = pdata->ts_hw_avg;
 794 +       ts->stab_time           = pdata->ts_stab_time;
 795 +       x_max                   = pdata->ts_x_max ? : 4096;
 796 +       ts->fudge_x             = pdata->ts_x_fudge ? : 4;
 797 +       y_max                   = pdata->ts_y_max ? : 4096;
 798 +       ts->fudge_y             = pdata->ts_y_fudge ? : 8;
 799 +       ts->p_max               = pdata->ts_pressure_max ? : MAX_12BIT;
 800 +       ts->touch_pressure      = pdata->ts_touch_pressure ? : ts->p_max;
 801 +       ts->fudge_p             = pdata->ts_pressure_fudge ? : 2;
 802 +
 803 +       ts->set_reset           = pdata->set_reset;
 804 +
 805 +       idev = input_allocate_device();
 806 +       if (idev == NULL) {
 807 +               r = -ENOMEM;
 808 +               goto err1;
 809 +       }
 810 +
 811 +       idev->name = "TSC2005 touchscreen";
 812 +       snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
 813 +                dev_name(&ts->spi->dev));
 814 +       idev->phys = ts->phys;
 815 +
 816 +       idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
 817 +       idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
 818 +       idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 819 +       ts->idev = idev;
 820 +
 821 +       tsc2005_ts_setup_spi_xfer(ts);
 822 +
 823 +       input_set_abs_params(idev, ABS_X, 0, x_max, ts->fudge_x, 0);
 824 +       input_set_abs_params(idev, ABS_Y, 0, y_max, ts->fudge_y, 0);
 825 +       input_set_abs_params(idev, ABS_PRESSURE, 0, ts->p_max, ts->fudge_p, 0);
 826 +
 827 +       tsc2005_start_scan(ts);
 828 +
 829 +       r = request_irq(ts->spi->irq, tsc2005_ts_irq_handler,
 830 +                       (((TSC2005_CFR2_INITVALUE & TSC2005_CFR2_IRQ_MASK) ==
 831 +                         TSC2005_CFR2_IRQ_PENDAV)
 832 +                        ? IRQF_TRIGGER_RISING
 833 +                        : IRQF_TRIGGER_FALLING) |
 834 +                       IRQF_DISABLED, "tsc2005", ts);
 835 +       if (r < 0) {
 836 +               dev_err(&ts->spi->dev, "unable to get DAV IRQ");
 837 +               goto err2;
 838 +       }
 839 +
 840 +       set_irq_wake(ts->spi->irq, 1);
 841 +
 842 +       r = input_register_device(idev);
 843 +       if (r < 0) {
 844 +               dev_err(&ts->spi->dev, "can't register touchscreen device\n");
 845 +               goto err3;
 846 +       }
 847 +
 848 +       /* We can tolerate these failing */
 849 +       r = device_create_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
 850 +       if (r < 0)
 851 +               dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
 852 +                        dev_attr_ts_ctrl_selftest.attr.name, r);
 853 +
 854 +       r = device_create_file(&ts->spi->dev, &dev_attr_pen_down);
 855 +       if (r < 0)
 856 +               dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
 857 +                        dev_attr_pen_down.attr.name, r);
 858 +
 859 +       r = device_create_file(&ts->spi->dev, &dev_attr_disable_ts);
 860 +       if (r < 0)
 861 +               dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
 862 +                        dev_attr_disable_ts.attr.name, r);
 863 +
 864 +       /* Finally, configure and start the optional EDD watchdog. */
 865 +       ts->esd_timeout = pdata->esd_timeout;
 866 +       if (ts->esd_timeout && ts->set_reset) {
 867 +               unsigned long wdj;
 868 +               setup_timer(&ts->esd_timer, tsc2005_esd_timer_handler,
 869 +                           (unsigned long)ts);
 870 +               INIT_WORK(&ts->esd_work, tsc2005_rst_handler);
 871 +               wdj = msecs_to_jiffies(ts->esd_timeout);
 872 +               ts->esd_timer.expires = round_jiffies(jiffies+wdj);
 873 +               add_timer(&ts->esd_timer);
 874 +       }
 875 +
 876 +       return 0;
 877 +err3:
 878 +       free_irq(ts->spi->irq, ts);
 879 +err2:
 880 +       tsc2005_stop_scan(ts);
 881 +       input_free_device(idev);
 882 +err1:
 883 +       return r;
 884 +}
 885 +
 886 +static int __devinit tsc2005_probe(struct spi_device *spi)
 887 +{
 888 +       struct tsc2005                  *ts;
 889 +       struct tsc2005_platform_data    *pdata = spi->dev.platform_data;
 890 +       int r;
 891 +
 892 +       if (spi->irq < 0) {
 893 +               dev_dbg(&spi->dev, "no irq?\n");
 894 +               return -ENODEV;
 895 +       }
 896 +       if (!pdata) {
 897 +               dev_dbg(&spi->dev, "no platform data?\n");
 898 +               return -ENODEV;
 899 +       }
 900 +
 901 +       ts = kzalloc(sizeof(*ts), GFP_KERNEL);
 902 +       if (ts == NULL)
 903 +               return -ENOMEM;
 904 +
 905 +       dev_set_drvdata(&spi->dev, ts);
 906 +       ts->spi = spi;
 907 +       spi->dev.power.power_state = PMSG_ON;
 908 +
 909 +       spi->mode = SPI_MODE_0;
 910 +       spi->bits_per_word = 8;
 911 +       /* The max speed might've been defined by the board-specific
 912 +        * struct */
 913 +       if (!spi->max_speed_hz)
 914 +               spi->max_speed_hz = TSC2005_HZ;
 915 +
 916 +       spi_setup(spi);
 917 +
 918 +       r = tsc2005_ts_init(ts, pdata);
 919 +       if (r)
 920 +               goto err1;
 921 +
 922 +       return 0;
 923 +
 924 +err1:
 925 +       kfree(ts);
 926 +       return r;
 927 +}
 928 +
 929 +static int __devexit tsc2005_remove(struct spi_device *spi)
 930 +{
 931 +       struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
 932 +
 933 +       mutex_lock(&ts->mutex);
 934 +       tsc2005_disable(ts);
 935 +       mutex_unlock(&ts->mutex);
 936 +
 937 +       device_remove_file(&ts->spi->dev, &dev_attr_disable_ts);
 938 +       device_remove_file(&ts->spi->dev, &dev_attr_pen_down);
 939 +       device_remove_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
 940 +
 941 +       free_irq(ts->spi->irq, ts);
 942 +       input_unregister_device(ts->idev);
 943 +
 944 +       if (ts->esd_timeout)
 945 +               del_timer(&ts->esd_timer);
 946 +       kfree(ts);
 947 +
 948 +       return 0;
 949 +}
 950 +
 951 +#ifdef CONFIG_PM
 952 +static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg)
 953 +{
 954 +       struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
 955 +
 956 +       mutex_lock(&ts->mutex);
 957 +       tsc2005_disable(ts);
 958 +       mutex_unlock(&ts->mutex);
 959 +
 960 +       return 0;
 961 +}
 962 +
 963 +static int tsc2005_resume(struct spi_device *spi)
 964 +{
 965 +       struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
 966 +
 967 +       mutex_lock(&ts->mutex);
 968 +       tsc2005_enable(ts);
 969 +       mutex_unlock(&ts->mutex);
 970 +
 971 +       return 0;
 972 +}
 973 +#endif
 974 +
 975 +static struct spi_driver tsc2005_driver = {
 976 +       .driver = {
 977 +               .name = "tsc2005",
 978 +               .owner = THIS_MODULE,
 979 +       },
 980 +#ifdef CONFIG_PM
 981 +       .suspend = tsc2005_suspend,
 982 +       .resume = tsc2005_resume,
 983 +#endif
 984 +       .probe = tsc2005_probe,
 985 +       .remove = __devexit_p(tsc2005_remove),
 986 +};
 987 +
 988 +static int __init tsc2005_init(void)
 989 +{
 990 +       printk(KERN_INFO "TSC2005 driver initializing\n");
 991 +
 992 +       return spi_register_driver(&tsc2005_driver);
 993 +}
 994 +module_init(tsc2005_init);
 995 +
 996 +static void __exit tsc2005_exit(void)
 997 +{
 998 +       spi_unregister_driver(&tsc2005_driver);
 999 +}
1000 +module_exit(tsc2005_exit);
1001 +
1002 +MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
1003 +MODULE_LICENSE("GPL");
1004 +MODULE_ALIAS("platform:tsc2005");
1005 Index: linux-2.6.37-rc1/include/linux/spi/tsc2005.h
1006 ===================================================================
1007 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
1008 +++ linux-2.6.37-rc1/include/linux/spi/tsc2005.h        2010-11-05 17:04:55.413000001 +0100
1009 @@ -0,0 +1,30 @@
1010 +#ifndef _LINUX_SPI_TSC2005_H
1011 +#define _LINUX_SPI_TSC2005_H
1012 +
1013 +#include <linux/types.h>
1014 +
1015 +struct tsc2005_platform_data {
1016 +       u16     ts_x_plate_ohm;
1017 +       u32     ts_stab_time;   /* voltage settling time */
1018 +       u8      ts_hw_avg;      /* HW assiseted averaging. Can be
1019 +                                  0, 4, 8, 16 samples per reading */
1020 +       u32     ts_touch_pressure;      /* Pressure limit until we report a
1021 +                                          touch event. After that we switch
1022 +                                          to ts_max_pressure. */
1023 +       u32     ts_pressure_max;/* Samples with bigger pressure value will
1024 +                                  be ignored, since the corresponding X, Y
1025 +                                  values are unreliable */
1026 +       u32     ts_pressure_fudge;
1027 +       u32     ts_x_max;
1028 +       u32     ts_x_fudge;
1029 +       u32     ts_y_max;
1030 +       u32     ts_y_fudge;
1031 +
1032 +       u32     esd_timeout;    /* msec of inactivity before we check */
1033 +
1034 +       unsigned ts_ignore_last:1;
1035 +
1036 +       void (*set_reset)(bool enable);
1037 +};
1038 +
1039 +#endif