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 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 #include <linux/version.h>
  33
  34 #include <linux/init.h>
  35 #include <linux/fs.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/irq.h>
  38 #include <linux/sched.h>
  39 #include <linux/pm.h>
  40 #include <linux/sysctl.h>
  41 #include <linux/proc_fs.h>
  42 #include <linux/delay.h>
  43 #include <linux/platform_device.h>
  44 #include <linux/input.h>
  45
  46 #include <asm/portmux.h>
  47 #include <asm/mach/bf54x_keys.h>
  48
  49 #define DRV_NAME        "bf54x-keys"
  50 #define TIME_SCALE      100     /* 100 ns */
  51 #define MAX_MULT        (0xFF * TIME_SCALE)
  52 #define MAX_RC          8       /* Max Row/Col */
  53
  54 static const u16 per_rows[] = {
  55         P_KEY_ROW7,
  56         P_KEY_ROW6,
  57         P_KEY_ROW5,
  58         P_KEY_ROW4,
  59         P_KEY_ROW3,
  60         P_KEY_ROW2,
  61         P_KEY_ROW1,
  62         P_KEY_ROW0,
  63         0
  64 };
  65
  66 static const u16 per_cols[] = {
  67         P_KEY_COL7,
  68         P_KEY_COL6,
  69         P_KEY_COL5,
  70         P_KEY_COL4,
  71         P_KEY_COL3,
  72         P_KEY_COL2,
  73         P_KEY_COL1,
  74         P_KEY_COL0,
  75         0
  76 };
  77
  78 struct bf54x_kpad {
  79         struct input_dev *input;
  80         int irq;
  81         unsigned short lastkey;
  82         unsigned short *keycode;
  83         struct timer_list timer;
  84         unsigned int keyup_test_jiffies;
  85 };
  86
  87 static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad,
  88                         struct input_dev *input, u16 keyident)
  89 {
  90         u16 i;
  91
  92         for (i = 0; i < input->keycodemax; i++)
  93                 if (bf54x_kpad->keycode[i + input->keycodemax] == keyident)
  94                         return bf54x_kpad->keycode[i];
  95         return -1;
  96 }
  97
  98 static inline void bfin_keycodecpy(unsigned short *keycode,
  99                         const unsigned int *pdata_kc,
 100                         unsigned short keymapsize)
 101 {
 102         unsigned int i;
 103
 104         for (i = 0; i < keymapsize; i++) {
 105                 keycode[i] = pdata_kc[i] & 0xffff;
 106                 keycode[i + keymapsize] = pdata_kc[i] >> 16;
 107         }
 108 }
 109
 110 static inline u16 bfin_kpad_get_prescale(u32 timescale)
 111 {
 112         u32 sclk = get_sclk();
 113
 114         return ((((sclk / 1000) * timescale) / 1024) - 1);
 115 }
 116
 117 static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad)
 118 {
 119         return (bfin_read_KPAD_STAT() & KPAD_PRESSED);
 120 }
 121
 122 static inline void bfin_kpad_clear_irq(void)
 123 {
 124         bfin_write_KPAD_STAT(0xFFFF);
 125         bfin_write_KPAD_ROWCOL(0xFFFF);
 126 }
 127
 128 static void bfin_kpad_timer(unsigned long data)
 129 {
 130         struct platform_device *pdev =  (struct platform_device *) data;
 131         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 132
 133         if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 134                 /* Try again later */
 135                 mod_timer(&bf54x_kpad->timer,
 136                           jiffies + bf54x_kpad->keyup_test_jiffies);
 137                 return;
 138         }
 139
 140         input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0);
 141         input_sync(bf54x_kpad->input);
 142
 143         /* Clear IRQ Status */
 144
 145         bfin_kpad_clear_irq();
 146         enable_irq(bf54x_kpad->irq);
 147 }
 148
 149 static irqreturn_t bfin_kpad_isr(int irq, void *dev_id)
 150 {
 151         struct platform_device *pdev = dev_id;
 152         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 153         struct input_dev *input = bf54x_kpad->input;
 154         int key;
 155         u16 rowcol = bfin_read_KPAD_ROWCOL();
 156
 157         key = bfin_kpad_find_key(bf54x_kpad, input, rowcol);
 158
 159         input_report_key(input, key, 1);
 160         input_sync(input);
 161
 162         if (bfin_kpad_get_keypressed(bf54x_kpad)) {
 163                 disable_irq(bf54x_kpad->irq);
 164                 bf54x_kpad->lastkey = key;
 165                 mod_timer(&bf54x_kpad->timer,
 166                           jiffies + bf54x_kpad->keyup_test_jiffies);
 167         } else {
 168                 input_report_key(input, key, 0);
 169                 input_sync(input);
 170
 171                 bfin_kpad_clear_irq();
 172         }
 173
 174         return IRQ_HANDLED;
 175 }
 176
 177 static int __devinit bfin_kpad_probe(struct platform_device *pdev)
 178 {
 179         struct bf54x_kpad *bf54x_kpad;
 180         struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 181         struct input_dev *input;
 182         int i, error;
 183
 184         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 185                 printk(KERN_ERR DRV_NAME
 186                         ": No rows, cols or keymap from pdata\n");
 187                 return -EINVAL;
 188         }
 189
 190         if (!pdata->keymapsize ||
 191             pdata->keymapsize > (pdata->rows * pdata->cols)) {
 192                 printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n");
 193                 return -EINVAL;
 194         }
 195
 196         bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL);
 197         if (!bf54x_kpad)
 198                 return -ENOMEM;
 199
 200         platform_set_drvdata(pdev, bf54x_kpad);
 201
 202         /* Allocate memory for keymap followed by private LUT */
 203         bf54x_kpad->keycode = kmalloc(pdata->keymapsize *
 204                                         sizeof(unsigned short) * 2, GFP_KERNEL);
 205         if (!bf54x_kpad->keycode) {
 206                 error = -ENOMEM;
 207                 goto out;
 208         }
 209
 210         if (!pdata->debounce_time || !pdata->debounce_time > MAX_MULT ||
 211             !pdata->coldrive_time || !pdata->coldrive_time > MAX_MULT) {
 212                 printk(KERN_ERR DRV_NAME
 213                         ": Invalid Debounce/Columdrive Time from pdata\n");
 214                 bfin_write_KPAD_MSEL(0xFF0);    /* Default MSEL */
 215         } else {
 216                 bfin_write_KPAD_MSEL(
 217                         ((pdata->debounce_time / TIME_SCALE)
 218                                                 & DBON_SCALE) |
 219                         (((pdata->coldrive_time / TIME_SCALE) << 8)
 220                                                 & COLDRV_SCALE));
 221
 222         }
 223
 224         if (!pdata->keyup_test_interval)
 225                 bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50);
 226         else
 227                 bf54x_kpad->keyup_test_jiffies =
 228                         msecs_to_jiffies(pdata->keyup_test_interval);
 229
 230         if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows],
 231                                     DRV_NAME)) {
 232                 printk(KERN_ERR DRV_NAME
 233                         ": 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                 printk(KERN_ERR DRV_NAME
 241                         ": Requesting Peripherals failed\n");
 242                 error = -EFAULT;
 243                 goto out1;
 244         }
 245
 246         bf54x_kpad->irq = platform_get_irq(pdev, 0);
 247         if (bf54x_kpad->irq < 0) {
 248                 error = -ENODEV;
 249                 goto out2;
 250         }
 251
 252         error = request_irq(bf54x_kpad->irq, bfin_kpad_isr,
 253                                  IRQF_SAMPLE_RANDOM, DRV_NAME, pdev);
 254         if (error) {
 255                 printk(KERN_ERR DRV_NAME
 256                         ": unable to claim irq %d; error %d\n",
 257                         bf54x_kpad->irq, error);
 258                 goto out2;
 259         }
 260
 261         input = input_allocate_device();
 262         if (!input) {
 263                 error = -ENOMEM;
 264                 goto out3;
 265         }
 266
 267         bf54x_kpad->input = input;
 268
 269         input->name = pdev->name;
 270         input->phys = "bf54x-keys/input0";
 271         input->dev.parent = &pdev->dev;
 272
 273         input_set_drvdata(input, bf54x_kpad);
 274
 275         input->id.bustype = BUS_HOST;
 276         input->id.vendor = 0x0001;
 277         input->id.product = 0x0001;
 278         input->id.version = 0x0100;
 279
 280         input->keycodesize = sizeof(unsigned short);
 281         input->keycodemax = pdata->keymapsize;
 282         input->keycode = bf54x_kpad->keycode;
 283
 284         bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize);
 285
 286         /* setup input device */
 287         __set_bit(EV_KEY, input->evbit);
 288
 289         if (pdata->repeat)
 290                 __set_bit(EV_REP, input->evbit);
 291
 292         for (i = 0; i < input->keycodemax; i++)
 293                 __set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit);
 294         __clear_bit(KEY_RESERVED, input->keybit);
 295
 296         error = input_register_device(input);
 297         if (error) {
 298                 printk(KERN_ERR DRV_NAME
 299                         ": Unable to register input device (%d)\n", error);
 300                 goto out4;
 301         }
 302
 303         /* Init Keypad Key Up/Release test timer */
 304
 305         setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev);
 306
 307         bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE));
 308
 309         bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) |
 310                                 (((pdata->rows - 1) << 10) & KPAD_ROWEN) |
 311                                 (2 & KPAD_IRQMODE));
 312
 313         bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN);
 314
 315         printk(KERN_ERR DRV_NAME
 316                 ": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq);
 317
 318         return 0;
 319
 320 out4:
 321         input_free_device(input);
 322 out3:
 323         free_irq(bf54x_kpad->irq, pdev);
 324 out2:
 325         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 326 out1:
 327         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 328 out0:
 329         kfree(bf54x_kpad->keycode);
 330 out:
 331         kfree(bf54x_kpad);
 332         platform_set_drvdata(pdev, NULL);
 333
 334         return error;
 335 }
 336
 337 static int __devexit bfin_kpad_remove(struct platform_device *pdev)
 338 {
 339         struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data;
 340         struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev);
 341
 342         del_timer_sync(&bf54x_kpad->timer);
 343         free_irq(bf54x_kpad->irq, pdev);
 344
 345         input_unregister_device(bf54x_kpad->input);
 346
 347         peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]);
 348         peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]);
 349
 350         kfree(bf54x_kpad->keycode);
 351         kfree(bf54x_kpad);
 352         platform_set_drvdata(pdev, NULL);
 353
 354         return 0;
 355 }
 356
 357 struct platform_driver bfin_kpad_device_driver = {
 358         .probe          = bfin_kpad_probe,
 359         .remove         = __devexit_p(bfin_kpad_remove),
 360         .driver         = {
 361                 .name   = DRV_NAME,
 362         }
 363 };
 364
 365 static int __init bfin_kpad_init(void)
 366 {
 367         return platform_driver_register(&bfin_kpad_device_driver);
 368 }
 369
 370 static void __exit bfin_kpad_exit(void)
 371 {
 372         platform_driver_unregister(&bfin_kpad_device_driver);
 373 }
 374
 375 module_init(bfin_kpad_init);
 376 module_exit(bfin_kpad_exit);
 377
 378 MODULE_LICENSE("GPL");
 379 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 380 MODULE_DESCRIPTION("Keypad driver for BF54x Processors");