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   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 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 <asm/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 };
  85
  86 static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
  87                         struct input_dev *input, u16 keyident)
  88 {
  89         u16 i;
  90
  91         for (i = 0; i < input->keycodemax; i++)
  92                 if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
  93                         return bf54x_kpad->keycode[i];
  94         return -1;
  95 }
  96
  97 static inline void bfin_keycodecpy(unsigned short *keycode,
  98                         const unsigned int *pdata_kc,
  99                         unsigned short keymapsize)
 100 {
 101         unsigned int i;
 102
 103         for (i = 0; i < keymapsize; i++) {
 104                 keycode[i] = pdata_kc[i] & 0xffff;
 105                 keycode[i + keymapsize] = pdata_kc[i] >> 16;
 106         }
 107 }
 108
 109 static inline u16 bfin_kpad_get_prescale(u32 timescale)
 110 {
 111         u32 sclk = get_sclk();
 112
 113         return ((((sclk / 1000) * timescale) / 1024) - 1);
 114 }
 115
 116 static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
 117 {
 118         return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
 119 }
 120
 121 static inline void bfin_kpad_clear_irq(void)
 122 {
 123         bfin_write_KPAD_STAT(0xFFFF);
 124         bfin_write_KPAD_ROWCOL(0xFFFF);
 125 }
 126
 127 static void bfin_kpad_timer(unsigned long data)
 128 {
 129         struct platform_device *pdev =  (struct platform_device *) data;
 130         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 131
 132         if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 133                 /* Try again later */
 134                 mod_timer(&bf54x_kpad->timer,
 135                           jiffies + bf54x_kpad->keyup_test_jiffies);
 136                 return;
 137         }
 138
 139         input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
 140         input_sync(bf54x_kpad->input);
 141
 142         /* Clear IRQ Status */
 143
 144         bfin_kpad_clear_irq();
 145         enable_irq(bf54x_kpad->irq);
 146 }
 147
 148 static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
 149 {
 150         struct platform_device *pdev = dev_id;
 151         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 152         struct input_dev *input = bf54x_kpad->input;
 153         int key;
 154         u16 rowcol = bfin_read_KPAD_ROWCOL();
 155
 156         key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);
 157
 158         input_report_key(input, key, 1);
 159         input_sync(input);
 160
 161         if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 162                 disable_irq(bf54x_kpad->irq);
 163                 bf54x_kpad->lastkey = key;
 164                 mod_timer(&bf54x_kpad->timer,
 165                           jiffies + bf54x_kpad->keyup_test_jiffies);
 166         } else {
 167                 input_report_key(input, key, 0);
 168                 input_sync(input);
 169
 170                 bfin_kpad_clear_irq();
 171         }
 172
 173         return IRQ_HANDLED;
 174 }
 175
 176 static int __devinit bfin_kpad_probe(struct platform_device *pdev)
 177 {
 178         struct bf54x_kpad *bf54x_kpad;
 179         struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 180         struct input_dev *input;
 181         int i, error;
 182
 183         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 184                 printk(KERN_ERR DRV_NAME
 185                         ": No rows, cols or keymap from pdata\n");
 186                 return -EINVAL;
 187         }
 188
 189         if (!pdata->keymapsize ||
 190             pdata->keymapsize > (pdata->rows * pdata->cols)) {
 191                 printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
 192                 return -EINVAL;
 193         }
 194
 195         bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
 196         if (!bf54x_kpad)
 197                 return -ENOMEM;
 198
 199         platform_set_drvdata(pdev, bf54x_kpad);
 200
 201         /* Allocate memory for keymap followed by private LUT */
 202         bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
 203                                         sizeof(unsigned short) * 2, GFP_KERNEL);
 204         if (!bf54x_kpad->keycode) {
 205                 error = -ENOMEM;
 206                 goto out;
 207         }
 208
 209         if (!pdata->debounce_time || !pdata->debounce_time > MAX_MULT ||
 210             !pdata->coldrive_time || !pdata->coldrive_time > MAX_MULT) {
 211                 printk(KERN_ERR DRV_NAME
 212                         ": Invalid Debounce/Columdrive Time from pdata\n");
 213                 bfin_write_KPAD_MSEL(0xFF0);    /* Default MSEL */
 214         } else {
 215                 bfin_write_KPAD_MSEL(
 216                         ((pdata->debounce_time / TIME_SCALE)
 217                                                 & DBON_SCALE) |
 218                         (((pdata->coldrive_time / TIME_SCALE) << 8)
 219                                                 & COLDRV_SCALE));
 220
 221         }
 222
 223         if (!pdata->keyup_test_interval)
 224                 bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
 225         else
 226                 bf54x_kpad->keyup_test_jiffies =
 227                         msecs_to_jiffies(pdata->keyup_test_interval);
 228
 229         if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
 230                                     DRV_NAME)) {
 231                 printk(KERN_ERR DRV_NAME
 232                         ": Requesting Peripherals failed\n");
 233                 error = -EFAULT;
 234                 goto out0;
 235         }
 236
 237         if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols],
 238                                     DRV_NAME)) {
 239                 printk(KERN_ERR DRV_NAME
 240                         ": 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                                  IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
 253         if (error) {
 254                 printk(KERN_ERR DRV_NAME
 255                         ": unable to claim irq %d; error %d\n",
 256                         bf54x_kpad->irq, error);
 257                 goto out2;
 258         }
 259
 260         input = input_allocate_device();
 261         if (!input) {
 262                 error = -ENOMEM;
 263                 goto out3;
 264         }
 265
 266         bf54x_kpad->input = input;
 267
 268         input->name = pdev->name;
 269         input->phys = "bf54x-keys/input0";
 270         input->dev.parent = &pdev->dev;
 271
 272         input_set_drvdata(input, bf54x_kpad);
 273
 274         input->id.bustype = BUS_HOST;
 275         input->id.vendor = 0x0001;
 276         input->id.product = 0x0001;
 277         input->id.version = 0x0100;
 278
 279         input->keycodesize = sizeof(unsigned short);
 280         input->keycodemax = pdata->keymapsize;
 281         input->keycode = bf54x_kpad->keycode;
 282
 283         bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);
 284
 285         /* setup input device */
 286         __set_bit(EV_KEY, input->evbit);
 287
 288         if (pdata->repeat)
 289                 __set_bit(EV_REP, input->evbit);
 290
 291         for (i = 0; i < input->keycodemax; i++)
 292                 __set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
 293         __clear_bit(KEY_RESERVED, input->keybit);
 294
 295         error = input_register_device(input);
 296         if (error) {
 297                 printk(KERN_ERR DRV_NAME
 298                         ": Unable to register input device (%d)\n", error);
 299                 goto out4;
 300         }
 301
 302         /* Init Keypad Key Up/Release test timer */
 303
 304         setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);
 305
 306         bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));
 307
 308         bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
 309                                 (((pdata->rows - 1) << 10) & KPAD_ROWEN) |
 310                                 (2 & KPAD_IRQMODE));
 311
 312         bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);
 313
 314         device_init_wakeup(&pdev->dev, 1);
 315
 316         printk(KERN_ERR DRV_NAME
 317                 ": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);
 318
 319         return 0;
 320
 321 out4:
 322         input_free_device(input);
 323 out3:
 324         free_irq(bf54x_kpad->irq, pdev);
 325 out2:
 326         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 327 out1:
 328         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 329 out0:
 330         kfree(bf54x_kpad->keycode);
 331 out:
 332         kfree(bf54x_kpad);
 333         platform_set_drvdata(pdev, NULL);
 334
 335         return error;
 336 }
 337
 338 static int __devexit bfin_kpad_remove(struct platform_device *pdev)
 339 {
 340         struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 341         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 342
 343         del_timer_sync(&bf54x_kpad->timer);
 344         free_irq(bf54x_kpad->irq, pdev);
 345
 346         input_unregister_device(bf54x_kpad->input);
 347
 348         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 349         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 350
 351         kfree(bf54x_kpad->keycode);
 352         kfree(bf54x_kpad);
 353         platform_set_drvdata(pdev, NULL);
 354
 355         return 0;
 356 }
 357
 358 #ifdef CONFIG_PM
 359 static int bfin_kpad_suspend(struct platform_device *pdev, pm_message_t state)
 360 {
 361         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 362
 363         if (device_may_wakeup(&pdev->dev))
 364                 enable_irq_wake(bf54x_kpad->irq);
 365
 366         return 0;
 367 }
 368
 369 static int bfin_kpad_resume(struct platform_device *pdev)
 370 {
 371         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 372
 373         if (device_may_wakeup(&pdev->dev))
 374                 disable_irq_wake(bf54x_kpad->irq);
 375
 376         return 0;
 377 }
 378 #else
 379 # define bfin_kpad_suspend NULL
 380 # define bfin_kpad_resume  NULL
 381 #endif
 382
 383 struct platform_driver bfin_kpad_device_driver = {
 384         .driver         = {
 385                 .name   = DRV_NAME,
 386                 .owner  = THIS_MODULE,
 387         },
 388         .probe          = bfin_kpad_probe,
 389         .remove         = __devexit_p(bfin_kpad_remove),
 390         .suspend        = bfin_kpad_suspend,
 391         .resume         = bfin_kpad_resume,
 392 };
 393
 394 static int __init bfin_kpad_init(void)
 395 {
 396         return platform_driver_register(&bfin_kpad_device_driver);
 397 }
 398
 399 static void __exit bfin_kpad_exit(void)
 400 {
 401         platform_driver_unregister(&bfin_kpad_device_driver);
 402 }
 403
 404 module_init(bfin_kpad_init);
 405 module_exit(bfin_kpad_exit);
 406
 407 MODULE_LICENSE("GPL");
 408 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 409 MODULE_DESCRIPTION("Keypad driver for BF54x Processors");
 410 MODULE_ALIAS("platform:bf54x-keys");