release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/input/touchscreen/da9034-ts.c

   1 /*
   2  * Touchscreen driver for Dialog Semiconductor DA9034
   3  *
   4  * Copyright (C) 2006-2008 Marvell International Ltd.
   5  *      Fengwei Yin <fengwei.yin@marvell.com>
   6  *      Bin Yang  <bin.yang@marvell.com>
   7  *      Eric Miao <eric.miao@marvell.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/input.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/mfd/da903x.h>
  22 #include <linux/slab.h>
  23
  24 #define DA9034_MANUAL_CTRL      0x50
  25 #define DA9034_LDO_ADC_EN       (1 << 4)
  26
  27 #define DA9034_AUTO_CTRL1       0x51
  28
  29 #define DA9034_AUTO_CTRL2       0x52
  30 #define DA9034_AUTO_TSI_EN      (1 << 3)
  31 #define DA9034_PEN_DETECT       (1 << 4)
  32
  33 #define DA9034_TSI_CTRL1        0x53
  34 #define DA9034_TSI_CTRL2        0x54
  35 #define DA9034_TSI_X_MSB        0x6c
  36 #define DA9034_TSI_Y_MSB        0x6d
  37 #define DA9034_TSI_XY_LSB       0x6e
  38
  39 enum {
  40         STATE_IDLE,     /* wait for pendown */
  41         STATE_BUSY,     /* TSI busy sampling */
  42         STATE_STOP,     /* sample available */
  43         STATE_WAIT,     /* Wait to start next sample */
  44 };
  45
  46 enum {
  47         EVENT_PEN_DOWN,
  48         EVENT_PEN_UP,
  49         EVENT_TSI_READY,
  50         EVENT_TIMEDOUT,
  51 };
  52
  53 struct da9034_touch {
  54         struct device           *da9034_dev;
  55         struct input_dev        *input_dev;
  56
  57         struct delayed_work     tsi_work;
  58         struct notifier_block   notifier;
  59
  60         int     state;
  61
  62         int     interval_ms;
  63         int     x_inverted;
  64         int     y_inverted;
  65
  66         int     last_x;
  67         int     last_y;
  68 };
  69
  70 static inline int is_pen_down(struct da9034_touch *touch)
  71 {
  72         return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN);
  73 }
  74
  75 static inline int detect_pen_down(struct da9034_touch *touch, int on)
  76 {
  77         if (on)
  78                 return da903x_set_bits(touch->da9034_dev,
  79                                 DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
  80         else
  81                 return da903x_clr_bits(touch->da9034_dev,
  82                                 DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
  83 }
  84
  85 static int read_tsi(struct da9034_touch *touch)
  86 {
  87         uint8_t _x, _y, _v;
  88         int ret;
  89
  90         ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x);
  91         if (ret)
  92                 return ret;
  93
  94         ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y);
  95         if (ret)
  96                 return ret;
  97
  98         ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v);
  99         if (ret)
 100                 return ret;
 101
 102         touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3);
 103         touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2);
 104
 105         return 0;
 106 }
 107
 108 static inline int start_tsi(struct da9034_touch *touch)
 109 {
 110         return da903x_set_bits(touch->da9034_dev,
 111                         DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
 112 }
 113
 114 static inline int stop_tsi(struct da9034_touch *touch)
 115 {
 116         return da903x_clr_bits(touch->da9034_dev,
 117                         DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
 118 }
 119
 120 static inline void report_pen_down(struct da9034_touch *touch)
 121 {
 122         int x = touch->last_x;
 123         int y = touch->last_y;
 124
 125         x &= 0xfff;
 126         if (touch->x_inverted)
 127                 x = 1024 - x;
 128         y &= 0xfff;
 129         if (touch->y_inverted)
 130                 y = 1024 - y;
 131
 132         input_report_abs(touch->input_dev, ABS_X, x);
 133         input_report_abs(touch->input_dev, ABS_Y, y);
 134         input_report_key(touch->input_dev, BTN_TOUCH, 1);
 135
 136         input_sync(touch->input_dev);
 137 }
 138
 139 static inline void report_pen_up(struct da9034_touch *touch)
 140 {
 141         input_report_key(touch->input_dev, BTN_TOUCH, 0);
 142         input_sync(touch->input_dev);
 143 }
 144
 145 static void da9034_event_handler(struct da9034_touch *touch, int event)
 146 {
 147         int err;
 148
 149         switch (touch->state) {
 150         case STATE_IDLE:
 151                 if (event != EVENT_PEN_DOWN)
 152                         break;
 153
 154                 /* Enable auto measurement of the TSI, this will
 155                  * automatically disable pen down detection
 156                  */
 157                 err = start_tsi(touch);
 158                 if (err)
 159                         goto err_reset;
 160
 161                 touch->state = STATE_BUSY;
 162                 break;
 163
 164         case STATE_BUSY:
 165                 if (event != EVENT_TSI_READY)
 166                         break;
 167
 168                 err = read_tsi(touch);
 169                 if (err)
 170                         goto err_reset;
 171
 172                 /* Disable auto measurement of the TSI, so that
 173                  * pen down status will be available
 174                  */
 175                 err = stop_tsi(touch);
 176                 if (err)
 177                         goto err_reset;
 178
 179                 touch->state = STATE_STOP;
 180
 181                 mdelay(1);
 182                 da9034_event_handler(touch,
 183                                      is_pen_down(touch) ? EVENT_PEN_DOWN :
 184                                                           EVENT_PEN_UP);
 185                 break;
 186
 187         case STATE_STOP:
 188                 if (event == EVENT_PEN_DOWN) {
 189                         report_pen_down(touch);
 190                         schedule_delayed_work(&touch->tsi_work,
 191                                 msecs_to_jiffies(touch->interval_ms));
 192                         touch->state = STATE_WAIT;
 193                 }
 194
 195                 if (event == EVENT_PEN_UP) {
 196                         report_pen_up(touch);
 197                         touch->state = STATE_IDLE;
 198                 }
 199                 break;
 200
 201         case STATE_WAIT:
 202                 if (event != EVENT_TIMEDOUT)
 203                         break;
 204
 205                 if (is_pen_down(touch)) {
 206                         start_tsi(touch);
 207                         touch->state = STATE_BUSY;
 208                 } else {
 209                         report_pen_up(touch);
 210                         touch->state = STATE_IDLE;
 211                 }
 212                 break;
 213         }
 214         return;
 215
 216 err_reset:
 217         touch->state = STATE_IDLE;
 218         stop_tsi(touch);
 219         detect_pen_down(touch, 1);
 220 }
 221
 222 static void da9034_tsi_work(struct work_struct *work)
 223 {
 224         struct da9034_touch *touch =
 225                 container_of(work, struct da9034_touch, tsi_work.work);
 226
 227         da9034_event_handler(touch, EVENT_TIMEDOUT);
 228 }
 229
 230 static int da9034_touch_notifier(struct notifier_block *nb,
 231                                  unsigned long event, void *data)
 232 {
 233         struct da9034_touch *touch =
 234                 container_of(nb, struct da9034_touch, notifier);
 235
 236         if (event & DA9034_EVENT_TSI_READY)
 237                 da9034_event_handler(touch, EVENT_TSI_READY);
 238
 239         if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE)
 240                 da9034_event_handler(touch, EVENT_PEN_DOWN);
 241
 242         return 0;
 243 }
 244
 245 static int da9034_touch_open(struct input_dev *dev)
 246 {
 247         struct da9034_touch *touch = input_get_drvdata(dev);
 248         int ret;
 249
 250         ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier,
 251                         DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
 252         if (ret)
 253                 return -EBUSY;
 254
 255         /* Enable ADC LDO */
 256         ret = da903x_set_bits(touch->da9034_dev,
 257                         DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
 258         if (ret)
 259                 return ret;
 260
 261         /* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */
 262         ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b);
 263         if (ret)
 264                 return ret;
 265
 266         ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00);
 267         if (ret)
 268                 return ret;
 269
 270         touch->state = STATE_IDLE;
 271         detect_pen_down(touch, 1);
 272
 273         return 0;
 274 }
 275
 276 static void da9034_touch_close(struct input_dev *dev)
 277 {
 278         struct da9034_touch *touch = input_get_drvdata(dev);
 279
 280         da903x_unregister_notifier(touch->da9034_dev, &touch->notifier,
 281                         DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
 282
 283         cancel_delayed_work_sync(&touch->tsi_work);
 284
 285         touch->state = STATE_IDLE;
 286         stop_tsi(touch);
 287         detect_pen_down(touch, 0);
 288
 289         /* Disable ADC LDO */
 290         da903x_clr_bits(touch->da9034_dev,
 291                         DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
 292 }
 293
 294
 295 static int __devinit da9034_touch_probe(struct platform_device *pdev)
 296 {
 297         struct da9034_touch_pdata *pdata = pdev->dev.platform_data;
 298         struct da9034_touch *touch;
 299         struct input_dev *input_dev;
 300         int ret;
 301
 302         touch = kzalloc(sizeof(struct da9034_touch), GFP_KERNEL);
 303         if (touch == NULL) {
 304                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 305                 return -ENOMEM;
 306         }
 307
 308         touch->da9034_dev = pdev->dev.parent;
 309
 310         if (pdata) {
 311                 touch->interval_ms      = pdata->interval_ms;
 312                 touch->x_inverted       = pdata->x_inverted;
 313                 touch->y_inverted       = pdata->y_inverted;
 314         } else
 315                 /* fallback into default */
 316                 touch->interval_ms      = 10;
 317
 318         INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work);
 319         touch->notifier.notifier_call = da9034_touch_notifier;
 320
 321         input_dev = input_allocate_device();
 322         if (!input_dev) {
 323                 dev_err(&pdev->dev, "failed to allocate input device\n");
 324                 ret = -ENOMEM;
 325                 goto err_free_touch;
 326         }
 327
 328         input_dev->name         = pdev->name;
 329         input_dev->open         = da9034_touch_open;
 330         input_dev->close        = da9034_touch_close;
 331         input_dev->dev.parent   = &pdev->dev;
 332
 333         __set_bit(EV_ABS, input_dev->evbit);
 334         __set_bit(ABS_X, input_dev->absbit);
 335         __set_bit(ABS_Y, input_dev->absbit);
 336         input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
 337         input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
 338
 339         __set_bit(EV_KEY, input_dev->evbit);
 340         __set_bit(BTN_TOUCH, input_dev->keybit);
 341
 342         touch->input_dev = input_dev;
 343         input_set_drvdata(input_dev, touch);
 344
 345         ret = input_register_device(input_dev);
 346         if (ret)
 347                 goto err_free_input;
 348
 349         platform_set_drvdata(pdev, touch);
 350         return 0;
 351
 352 err_free_input:
 353         input_free_device(input_dev);
 354 err_free_touch:
 355         kfree(touch);
 356         return ret;
 357 }
 358
 359 static int __devexit da9034_touch_remove(struct platform_device *pdev)
 360 {
 361         struct da9034_touch *touch = platform_get_drvdata(pdev);
 362
 363         input_unregister_device(touch->input_dev);
 364         kfree(touch);
 365
 366         return 0;
 367 }
 368
 369 static struct platform_driver da9034_touch_driver = {
 370         .driver = {
 371                 .name   = "da9034-touch",
 372                 .owner  = THIS_MODULE,
 373         },
 374         .probe          = da9034_touch_probe,
 375         .remove         = __devexit_p(da9034_touch_remove),
 376 };
 377
 378 static int __init da9034_touch_init(void)
 379 {
 380         return platform_driver_register(&da9034_touch_driver);
 381 }
 382 module_init(da9034_touch_init);
 383
 384 static void __exit da9034_touch_exit(void)
 385 {
 386         platform_driver_unregister(&da9034_touch_driver);
 387 }
 388 module_exit(da9034_touch_exit);
 389
 390 MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034");
 391 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>");
 392 MODULE_LICENSE("GPL");
 393 MODULE_ALIAS("platform:da9034-touch");