drivers/input/keyboard/bf54x-keys.c

   1 /*
   2  * File:         drivers/input/keyboard/bf54x-keys.c
   3  * Based on:
   4  * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
   5  *
   6  * Created:
   7  * Description:  keypad driver for Analog Devices Blackfin BF54x Processors
   8  *
   9  *
  10  * Modified:
  11  *               Copyright 2007-2008 Analog Devices Inc.
  12  *
  13  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, see the file COPYING, or write
  27  * to the Free Software Foundation, Inc.,
  28  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  29  */
  30
  31 #include <linux/module.h>
  32
  33 #include <linux/fs.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/irq.h>
  36 #include <linux/slab.h>
  37 #include <linux/sched.h>
  38 #include <linux/pm.h>
  39 #include <linux/sysctl.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/delay.h>
  42 #include <linux/platform_device.h>
  43 #include <linux/input.h>
  44
  45 #include <asm/portmux.h>
  46 #include <mach/bf54x_keys.h>
  47
  48 #define DRV_NAME        "bf54x-keys"
  49 #define TIME_SCALE      100     /* 100 ns */
  50 #define MAX_MULT        (0xFF * TIME_SCALE)
  51 #define MAX_RC          8       /* Max Row/Col */
  52
  53 static const u16 per_rows[] = {
  54         P_KEY_ROW7,
  55         P_KEY_ROW6,
  56         P_KEY_ROW5,
  57         P_KEY_ROW4,
  58         P_KEY_ROW3,
  59         P_KEY_ROW2,
  60         P_KEY_ROW1,
  61         P_KEY_ROW0,
  62         0
  63 };
  64
  65 static const u16 per_cols[] = {
  66         P_KEY_COL7,
  67         P_KEY_COL6,
  68         P_KEY_COL5,
  69         P_KEY_COL4,
  70         P_KEY_COL3,
  71         P_KEY_COL2,
  72         P_KEY_COL1,
  73         P_KEY_COL0,
  74         0
  75 };
  76
  77 struct bf54x_kpad {
  78         struct input_dev *input;
  79         int irq;
  80         unsigned short lastkey;
  81         unsigned short *keycode;
  82         struct timer_list timer;
  83         unsigned int keyup_test_jiffies;
  84         unsigned short kpad_msel;
  85         unsigned short kpad_prescale;
  86         unsigned short kpad_ctl;
  87 };
  88
  89 static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
  90                         struct input_dev *input, u16 keyident)
  91 {
  92         u16 i;
  93
  94         for (i = 0; i < input->keycodemax; i++)
  95                 if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
  96                         return bf54x_kpad->keycode[i];
  97         return -1;
  98 }
  99
 100 static inline void bfin_keycodecpy(unsigned short *keycode,
 101                         const unsigned int *pdata_kc,
 102                         unsigned short keymapsize)
 103 {
 104         unsigned int i;
 105
 106         for (i = 0; i < keymapsize; i++) {
 107                 keycode[i] = pdata_kc[i] & 0xffff;
 108                 keycode[i + keymapsize] = pdata_kc[i] >> 16;
 109         }
 110 }
 111
 112 static inline u16 bfin_kpad_get_prescale(u32 timescale)
 113 {
 114         u32 sclk = get_sclk();
 115
 116         return ((((sclk / 1000) * timescale) / 1024) - 1);
 117 }
 118
 119 static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
 120 {
 121         return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
 122 }
 123
 124 static inline void bfin_kpad_clear_irq(void)
 125 {
 126         bfin_write_KPAD_STAT(0xFFFF);
 127         bfin_write_KPAD_ROWCOL(0xFFFF);
 128 }
 129
 130 static void bfin_kpad_timer(unsigned long data)
 131 {
 132         struct platform_device *pdev =  (struct platform_device *) data;
 133         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 134
 135         if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 136                 /* Try again later */
 137                 mod_timer(&bf54x_kpad->timer,
 138                           jiffies + bf54x_kpad->keyup_test_jiffies);
 139                 return;
 140         }
 141
 142         input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
 143         input_sync(bf54x_kpad->input);
 144
 145         /* Clear IRQ Status */
 146
 147         bfin_kpad_clear_irq();
 148         enable_irq(bf54x_kpad->irq);
 149 }
 150
 151 static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
 152 {
 153         struct platform_device *pdev = dev_id;
 154         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 155         struct input_dev *input = bf54x_kpad->input;
 156         int key;
 157         u16 rowcol = bfin_read_KPAD_ROWCOL();
 158
 159         key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);
 160
 161         input_report_key(input, key, 1);
 162         input_sync(input);
 163
 164         if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 165                 disable_irq_nosync(bf54x_kpad->irq);
 166                 bf54x_kpad->lastkey = key;
 167                 mod_timer(&bf54x_kpad->timer,
 168                           jiffies + bf54x_kpad->keyup_test_jiffies);
 169         } else {
 170                 input_report_key(input, key, 0);
 171                 input_sync(input);
 172
 173                 bfin_kpad_clear_irq();
 174         }
 175
 176         return IRQ_HANDLED;
 177 }
 178
 179 static int bfin_kpad_probe(struct platform_device *pdev)
 180 {
 181         struct bf54x_kpad *bf54x_kpad;
 182         struct bfin_kpad_platform_data *pdata = dev_get_platdata(&pdev->dev);
 183         struct input_dev *input;
 184         int i, error;
 185
 186         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 187                 dev_err(&pdev->dev, "no rows, cols or keymap from pdata\n");
 188                 return -EINVAL;
 189         }
 190
 191         if (!pdata->keymapsize ||
 192             pdata->keymapsize > (pdata->rows * pdata->cols)) {
 193                 dev_err(&pdev->dev, "invalid keymapsize\n");
 194                 return -EINVAL;
 195         }
 196
 197         bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
 198         if (!bf54x_kpad)
 199                 return -ENOMEM;
 200
 201         platform_set_drvdata(pdev, bf54x_kpad);
 202
 203         /* Allocate memory for keymap followed by private LUT */
 204         bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
 205                                         sizeof(unsigned short) * 2, GFP_KERNEL);
 206         if (!bf54x_kpad->keycode) {
 207                 error = -ENOMEM;
 208                 goto out;
 209         }
 210
 211         if (!pdata->debounce_time || pdata->debounce_time > MAX_MULT ||
 212             !pdata->coldrive_time || pdata->coldrive_time > MAX_MULT) {
 213                 dev_warn(&pdev->dev,
 214                         "invalid platform debounce/columndrive time\n");
 215                 bfin_write_KPAD_MSEL(0xFF0);    /* Default MSEL */
 216         } else {
 217                 bfin_write_KPAD_MSEL(
 218                         ((pdata->debounce_time / TIME_SCALE)
 219                                                 & DBON_SCALE) |
 220                         (((pdata->coldrive_time / TIME_SCALE) << 8)
 221                                                 & COLDRV_SCALE));
 222
 223         }
 224
 225         if (!pdata->keyup_test_interval)
 226                 bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
 227         else
 228                 bf54x_kpad->keyup_test_jiffies =
 229                         msecs_to_jiffies(pdata->keyup_test_interval);
 230
 231         if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
 232                                     DRV_NAME)) {
 233                 dev_err(&pdev->dev, "requesting peripherals failed\n");
 234                 error = -EFAULT;
 235                 goto out0;
 236         }
 237
 238         if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
 239                                     DRV_NAME)) {
 240                 dev_err(&pdev->dev, "requesting peripherals failed\n");
 241                 error = -EFAULT;
 242                 goto out1;
 243         }
 244
 245         bf54x_kpad->irq = platform_get_irq(pdev, 0);
 246         if (bf54x_kpad->irq < 0) {
 247                 error = -ENODEV;
 248                 goto out2;
 249         }
 250
 251         error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
 252                                 0, DRV_NAME, pdev);
 253         if (error) {
 254                 dev_err(&pdev->dev, "unable to claim irq %d\n",
 255                         bf54x_kpad->irq);
 256                 goto out2;
 257         }
 258
 259         input = input_allocate_device();
 260         if (!input) {
 261                 error = -ENOMEM;
 262                 goto out3;
 263         }
 264
 265         bf54x_kpad->input = input;
 266
 267         input->name = pdev->name;
 268         input->phys = "bf54x-keys/input0";
 269         input->dev.parent = &pdev->dev;
 270
 271         input_set_drvdata(input, bf54x_kpad);
 272
 273         input->id.bustype = BUS_HOST;
 274         input->id.vendor = 0x0001;
 275         input->id.product = 0x0001;
 276         input->id.version = 0x0100;
 277
 278         input->keycodesize = sizeof(unsigned short);
 279         input->keycodemax = pdata->keymapsize;
 280         input->keycode = bf54x_kpad->keycode;
 281
 282         bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);
 283
 284         /* setup input device */
 285         __set_bit(EV_KEY, input->evbit);
 286
 287         if (pdata->repeat)
 288                 __set_bit(EV_REP, input->evbit);
 289
 290         for (i = 0; i < input->keycodemax; i++)
 291                 if (bf54x_kpad->keycode[i] <= KEY_MAX)
 292                         __set_bit(bf54x_kpad->keycode[i], input->keybit);
 293         __clear_bit(KEY_RESERVED, input->keybit);
 294
 295         error = input_register_device(input);
 296         if (error) {
 297                 dev_err(&pdev->dev, "unable to register input device\n");
 298                 goto out4;
 299         }
 300
 301         /* Init Keypad Key Up/Release test timer */
 302
 303         setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);
 304
 305         bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));
 306
 307         bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
 308                                 (((pdata->rows - 1) << 10) & KPAD_ROWEN) |
 309                                 (2 & KPAD_IRQMODE));
 310
 311         bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);
 312
 313         device_init_wakeup(&pdev->dev, 1);
 314
 315         return 0;
 316
 317 out4:
 318         input_free_device(input);
 319 out3:
 320         free_irq(bf54x_kpad->irq, pdev);
 321 out2:
 322         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 323 out1:
 324         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 325 out0:
 326         kfree(bf54x_kpad->keycode);
 327 out:
 328         kfree(bf54x_kpad);
 329
 330         return error;
 331 }
 332
 333 static int bfin_kpad_remove(struct platform_device *pdev)
 334 {
 335         struct bfin_kpad_platform_data *pdata = dev_get_platdata(&pdev->dev);
 336         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 337
 338         del_timer_sync(&bf54x_kpad->timer);
 339         free_irq(bf54x_kpad->irq, pdev);
 340
 341         input_unregister_device(bf54x_kpad->input);
 342
 343         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 344         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 345
 346         kfree(bf54x_kpad->keycode);
 347         kfree(bf54x_kpad);
 348
 349         return 0;
 350 }
 351
 352 #ifdef CONFIG_PM
 353 static int bfin_kpad_suspend(struct platform_device *pdev, pm_message_t state)
 354 {
 355         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 356
 357         bf54x_kpad->kpad_msel = bfin_read_KPAD_MSEL();
 358         bf54x_kpad->kpad_prescale = bfin_read_KPAD_PRESCALE();
 359         bf54x_kpad->kpad_ctl = bfin_read_KPAD_CTL();
 360
 361         if (device_may_wakeup(&pdev->dev))
 362                 enable_irq_wake(bf54x_kpad->irq);
 363
 364         return 0;
 365 }
 366
 367 static int bfin_kpad_resume(struct platform_device *pdev)
 368 {
 369         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 370
 371         bfin_write_KPAD_MSEL(bf54x_kpad->kpad_msel);
 372         bfin_write_KPAD_PRESCALE(bf54x_kpad->kpad_prescale);
 373         bfin_write_KPAD_CTL(bf54x_kpad->kpad_ctl);
 374
 375         if (device_may_wakeup(&pdev->dev))
 376                 disable_irq_wake(bf54x_kpad->irq);
 377
 378         return 0;
 379 }
 380 #else
 381 # define bfin_kpad_suspend NULL
 382 # define bfin_kpad_resume  NULL
 383 #endif
 384
 385 static struct platform_driver bfin_kpad_device_driver = {
 386         .driver         = {
 387                 .name   = DRV_NAME,
 388         },
 389         .probe          = bfin_kpad_probe,
 390         .remove         = bfin_kpad_remove,
 391         .suspend        = bfin_kpad_suspend,
 392         .resume         = bfin_kpad_resume,
 393 };
 394 module_platform_driver(bfin_kpad_device_driver);
 395
 396 MODULE_LICENSE("GPL");
 397 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 398 MODULE_DESCRIPTION("Keypad driver for BF54x Processors");
 399 MODULE_ALIAS("platform:bf54x-keys");