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/init.h>
  34 #include <linux/fs.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/irq.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(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 __devinit bfin_kpad_probe(struct platform_device *pdev)
 180 {
 181         struct bf54x_kpad *bf54x_kpad;
 182         struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 183         struct input_dev *input;
 184         int i, error;
 185
 186         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 187                 printk(KERN_ERR DRV_NAME
 188                         ": No rows, cols or keymap from pdata\n");
 189                 return -EINVAL;
 190         }
 191
 192         if (!pdata->keymapsize ||
 193             pdata->keymapsize > (pdata->rows * pdata->cols)) {
 194                 printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
 195                 return -EINVAL;
 196         }
 197
 198         bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
 199         if (!bf54x_kpad)
 200                 return -ENOMEM;
 201
 202         platform_set_drvdata(pdev, bf54x_kpad);
 203
 204         /* Allocate memory for keymap followed by private LUT */
 205         bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
 206                                         sizeof(unsigned short) * 2, GFP_KERNEL);
 207         if (!bf54x_kpad->keycode) {
 208                 error = -ENOMEM;
 209                 goto out;
 210         }
 211
 212         if (!pdata->debounce_time || pdata->debounce_time > MAX_MULT ||
 213             !pdata->coldrive_time || pdata->coldrive_time > MAX_MULT) {
 214                 printk(KERN_WARNING DRV_NAME
 215                         ": Invalid Debounce/Columndrive Time in platform data\n");
 216                 bfin_write_KPAD_MSEL(0xFF0);    /* Default MSEL */
 217         } else {
 218                 bfin_write_KPAD_MSEL(
 219                         ((pdata->debounce_time / TIME_SCALE)
 220                                                 & DBON_SCALE) |
 221                         (((pdata->coldrive_time / TIME_SCALE) << 8)
 222                                                 & COLDRV_SCALE));
 223
 224         }
 225
 226         if (!pdata->keyup_test_interval)
 227                 bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
 228         else
 229                 bf54x_kpad->keyup_test_jiffies =
 230                         msecs_to_jiffies(pdata->keyup_test_interval);
 231
 232         if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
 233                                     DRV_NAME)) {
 234                 printk(KERN_ERR DRV_NAME
 235                         ": Requesting Peripherals failed\n");
 236                 error = -EFAULT;
 237                 goto out0;
 238         }
 239
 240         if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
 241                                     DRV_NAME)) {
 242                 printk(KERN_ERR DRV_NAME
 243                         ": Requesting Peripherals failed\n");
 244                 error = -EFAULT;
 245                 goto out1;
 246         }
 247
 248         bf54x_kpad->irq = platform_get_irq(pdev, 0);
 249         if (bf54x_kpad->irq < 0) {
 250                 error = -ENODEV;
 251                 goto out2;
 252         }
 253
 254         error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
 255                                  IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
 256         if (error) {
 257                 printk(KERN_ERR DRV_NAME
 258                         ": unable to claim irq %d; error %d\n",
 259                         bf54x_kpad->irq, error);
 260                 goto out2;
 261         }
 262
 263         input = input_allocate_device();
 264         if (!input) {
 265                 error = -ENOMEM;
 266                 goto out3;
 267         }
 268
 269         bf54x_kpad->input = input;
 270
 271         input->name = pdev->name;
 272         input->phys = "bf54x-keys/input0";
 273         input->dev.parent = &pdev->dev;
 274
 275         input_set_drvdata(input, bf54x_kpad);
 276
 277         input->id.bustype = BUS_HOST;
 278         input->id.vendor = 0x0001;
 279         input->id.product = 0x0001;
 280         input->id.version = 0x0100;
 281
 282         input->keycodesize = sizeof(unsigned short);
 283         input->keycodemax = pdata->keymapsize;
 284         input->keycode = bf54x_kpad->keycode;
 285
 286         bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);
 287
 288         /* setup input device */
 289         __set_bit(EV_KEY, input->evbit);
 290
 291         if (pdata->repeat)
 292                 __set_bit(EV_REP, input->evbit);
 293
 294         for (i = 0; i < input->keycodemax; i++)
 295                 __set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
 296         __clear_bit(KEY_RESERVED, input->keybit);
 297
 298         error = input_register_device(input);
 299         if (error) {
 300                 printk(KERN_ERR DRV_NAME
 301                         ": Unable to register input device (%d)\n", error);
 302                 goto out4;
 303         }
 304
 305         /* Init Keypad Key Up/Release test timer */
 306
 307         setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);
 308
 309         bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));
 310
 311         bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
 312                                 (((pdata->rows - 1) << 10) & KPAD_ROWEN) |
 313                                 (2 & KPAD_IRQMODE));
 314
 315         bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);
 316
 317         device_init_wakeup(&pdev->dev, 1);
 318
 319         printk(KERN_ERR DRV_NAME
 320                 ": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);
 321
 322         return 0;
 323
 324 out4:
 325         input_free_device(input);
 326 out3:
 327         free_irq(bf54x_kpad->irq, pdev);
 328 out2:
 329         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 330 out1:
 331         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 332 out0:
 333         kfree(bf54x_kpad->keycode);
 334 out:
 335         kfree(bf54x_kpad);
 336         platform_set_drvdata(pdev, NULL);
 337
 338         return error;
 339 }
 340
 341 static int __devexit bfin_kpad_remove(struct platform_device *pdev)
 342 {
 343         struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 344         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 345
 346         del_timer_sync(&bf54x_kpad->timer);
 347         free_irq(bf54x_kpad->irq, pdev);
 348
 349         input_unregister_device(bf54x_kpad->input);
 350
 351         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 352         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 353
 354         kfree(bf54x_kpad->keycode);
 355         kfree(bf54x_kpad);
 356         platform_set_drvdata(pdev, NULL);
 357
 358         return 0;
 359 }
 360
 361 #ifdef CONFIG_PM
 362 static int bfin_kpad_suspend(struct platform_device *pdev, pm_message_t state)
 363 {
 364         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 365
 366         bf54x_kpad->kpad_msel = bfin_read_KPAD_MSEL();
 367         bf54x_kpad->kpad_prescale = bfin_read_KPAD_PRESCALE();
 368         bf54x_kpad->kpad_ctl = bfin_read_KPAD_CTL();
 369
 370         if (device_may_wakeup(&pdev->dev))
 371                 enable_irq_wake(bf54x_kpad->irq);
 372
 373         return 0;
 374 }
 375
 376 static int bfin_kpad_resume(struct platform_device *pdev)
 377 {
 378         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 379
 380         bfin_write_KPAD_MSEL(bf54x_kpad->kpad_msel);
 381         bfin_write_KPAD_PRESCALE(bf54x_kpad->kpad_prescale);
 382         bfin_write_KPAD_CTL(bf54x_kpad->kpad_ctl);
 383
 384         if (device_may_wakeup(&pdev->dev))
 385                 disable_irq_wake(bf54x_kpad->irq);
 386
 387         return 0;
 388 }
 389 #else
 390 # define bfin_kpad_suspend NULL
 391 # define bfin_kpad_resume  NULL
 392 #endif
 393
 394 struct platform_driver bfin_kpad_device_driver = {
 395         .driver         = {
 396                 .name   = DRV_NAME,
 397                 .owner  = THIS_MODULE,
 398         },
 399         .probe          = bfin_kpad_probe,
 400         .remove         = __devexit_p(bfin_kpad_remove),
 401         .suspend        = bfin_kpad_suspend,
 402         .resume         = bfin_kpad_resume,
 403 };
 404
 405 static int __init bfin_kpad_init(void)
 406 {
 407         return platform_driver_register(&bfin_kpad_device_driver);
 408 }
 409
 410 static void __exit bfin_kpad_exit(void)
 411 {
 412         platform_driver_unregister(&bfin_kpad_device_driver);
 413 }
 414
 415 module_init(bfin_kpad_init);
 416 module_exit(bfin_kpad_exit);
 417
 418 MODULE_LICENSE("GPL");
 419 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 420 MODULE_DESCRIPTION("Keypad driver for BF54x Processors");
 421 MODULE_ALIAS("platform:bf54x-keys");