drivers/input/keyboard/omap4-keypad.c

   1 /*
   2  * OMAP4 Keypad Driver
   3  *
   4  * Copyright (C) 2010 Texas Instruments
   5  *
   6  * Author: Abraham Arce <x0066660@ti.com>
   7  * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.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 as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/errno.h>
  29 #include <linux/io.h>
  30 #include <linux/input.h>
  31 #include <linux/slab.h>
  32 #include <linux/pm_runtime.h>
  33
  34 #include <linux/platform_data/omap4-keypad.h>
  35
  36 /* OMAP4 registers */
  37 #define OMAP4_KBD_REVISION              0x00
  38 #define OMAP4_KBD_SYSCONFIG             0x10
  39 #define OMAP4_KBD_SYSSTATUS             0x14
  40 #define OMAP4_KBD_IRQSTATUS             0x18
  41 #define OMAP4_KBD_IRQENABLE             0x1C
  42 #define OMAP4_KBD_WAKEUPENABLE          0x20
  43 #define OMAP4_KBD_PENDING               0x24
  44 #define OMAP4_KBD_CTRL                  0x28
  45 #define OMAP4_KBD_DEBOUNCINGTIME        0x2C
  46 #define OMAP4_KBD_LONGKEYTIME           0x30
  47 #define OMAP4_KBD_TIMEOUT               0x34
  48 #define OMAP4_KBD_STATEMACHINE          0x38
  49 #define OMAP4_KBD_ROWINPUTS             0x3C
  50 #define OMAP4_KBD_COLUMNOUTPUTS         0x40
  51 #define OMAP4_KBD_FULLCODE31_0          0x44
  52 #define OMAP4_KBD_FULLCODE63_32         0x48
  53
  54 /* OMAP4 bit definitions */
  55 #define OMAP4_DEF_IRQENABLE_EVENTEN     (1 << 0)
  56 #define OMAP4_DEF_IRQENABLE_LONGKEY     (1 << 1)
  57 #define OMAP4_DEF_IRQENABLE_TIMEOUTEN   (1 << 2)
  58 #define OMAP4_DEF_WUP_EVENT_ENA         (1 << 0)
  59 #define OMAP4_DEF_WUP_LONG_KEY_ENA      (1 << 1)
  60 #define OMAP4_DEF_CTRL_NOSOFTMODE       (1 << 1)
  61 #define OMAP4_DEF_CTRLPTVVALUE          (1 << 2)
  62 #define OMAP4_DEF_CTRLPTV               (1 << 1)
  63
  64 /* OMAP4 values */
  65 #define OMAP4_VAL_IRQDISABLE            0x00
  66 #define OMAP4_VAL_DEBOUNCINGTIME        0x07
  67 #define OMAP4_VAL_FUNCTIONALCFG         0x1E
  68
  69 #define OMAP4_MASK_IRQSTATUSDISABLE     0xFFFF
  70
  71 struct omap4_keypad {
  72         struct input_dev *input;
  73
  74         void __iomem *base;
  75         int irq;
  76
  77         unsigned int rows;
  78         unsigned int cols;
  79         unsigned int row_shift;
  80         unsigned char key_state[8];
  81         unsigned short keymap[];
  82 };
  83
  84 /* Interrupt handler */
  85 static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
  86 {
  87         struct omap4_keypad *keypad_data = dev_id;
  88         struct input_dev *input_dev = keypad_data->input;
  89         unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
  90         unsigned int col, row, code, changed;
  91         u32 *new_state = (u32 *) key_state;
  92
  93         /* Disable interrupts */
  94         __raw_writel(OMAP4_VAL_IRQDISABLE,
  95                      keypad_data->base + OMAP4_KBD_IRQENABLE);
  96
  97         *new_state = __raw_readl(keypad_data->base + OMAP4_KBD_FULLCODE31_0);
  98         *(new_state + 1) = __raw_readl(keypad_data->base
  99                                                 + OMAP4_KBD_FULLCODE63_32);
 100
 101         for (row = 0; row < keypad_data->rows; row++) {
 102                 changed = key_state[row] ^ keypad_data->key_state[row];
 103                 if (!changed)
 104                         continue;
 105
 106                 for (col = 0; col < keypad_data->cols; col++) {
 107                         if (changed & (1 << col)) {
 108                                 code = MATRIX_SCAN_CODE(row, col,
 109                                                 keypad_data->row_shift);
 110                                 input_event(input_dev, EV_MSC, MSC_SCAN, code);
 111                                 input_report_key(input_dev,
 112                                                  keypad_data->keymap[code],
 113                                                  key_state[row] & (1 << col));
 114                         }
 115                 }
 116         }
 117
 118         input_sync(input_dev);
 119
 120         memcpy(keypad_data->key_state, key_state,
 121                 sizeof(keypad_data->key_state));
 122
 123         /* clear pending interrupts */
 124         __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
 125                         keypad_data->base + OMAP4_KBD_IRQSTATUS);
 126
 127         /* enable interrupts */
 128         __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
 129                         keypad_data->base + OMAP4_KBD_IRQENABLE);
 130
 131         return IRQ_HANDLED;
 132 }
 133
 134 static int omap4_keypad_open(struct input_dev *input)
 135 {
 136         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 137
 138         pm_runtime_get_sync(input->dev.parent);
 139
 140         disable_irq(keypad_data->irq);
 141
 142         __raw_writel(OMAP4_VAL_FUNCTIONALCFG,
 143                         keypad_data->base + OMAP4_KBD_CTRL);
 144         __raw_writel(OMAP4_VAL_DEBOUNCINGTIME,
 145                         keypad_data->base + OMAP4_KBD_DEBOUNCINGTIME);
 146         __raw_writel(OMAP4_VAL_IRQDISABLE,
 147                         keypad_data->base + OMAP4_KBD_IRQSTATUS);
 148         __raw_writel(OMAP4_DEF_IRQENABLE_EVENTEN | OMAP4_DEF_IRQENABLE_LONGKEY,
 149                         keypad_data->base + OMAP4_KBD_IRQENABLE);
 150         __raw_writel(OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA,
 151                         keypad_data->base + OMAP4_KBD_WAKEUPENABLE);
 152
 153         enable_irq(keypad_data->irq);
 154
 155         return 0;
 156 }
 157
 158 static void omap4_keypad_close(struct input_dev *input)
 159 {
 160         struct omap4_keypad *keypad_data = input_get_drvdata(input);
 161
 162         disable_irq(keypad_data->irq);
 163
 164         /* Disable interrupts */
 165         __raw_writel(OMAP4_VAL_IRQDISABLE,
 166                      keypad_data->base + OMAP4_KBD_IRQENABLE);
 167
 168         /* clear pending interrupts */
 169         __raw_writel(__raw_readl(keypad_data->base + OMAP4_KBD_IRQSTATUS),
 170                         keypad_data->base + OMAP4_KBD_IRQSTATUS);
 171
 172         enable_irq(keypad_data->irq);
 173
 174         pm_runtime_put_sync(input->dev.parent);
 175 }
 176
 177 static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 178 {
 179         const struct omap4_keypad_platform_data *pdata;
 180         struct omap4_keypad *keypad_data;
 181         struct input_dev *input_dev;
 182         struct resource *res;
 183         resource_size_t size;
 184         unsigned int row_shift, max_keys;
 185         int irq;
 186         int error;
 187
 188         /* platform data */
 189         pdata = pdev->dev.platform_data;
 190         if (!pdata) {
 191                 dev_err(&pdev->dev, "no platform data defined\n");
 192                 return -EINVAL;
 193         }
 194
 195         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 196         if (!res) {
 197                 dev_err(&pdev->dev, "no base address specified\n");
 198                 return -EINVAL;
 199         }
 200
 201         irq = platform_get_irq(pdev, 0);
 202         if (!irq) {
 203                 dev_err(&pdev->dev, "no keyboard irq assigned\n");
 204                 return -EINVAL;
 205         }
 206
 207         if (!pdata->keymap_data) {
 208                 dev_err(&pdev->dev, "no keymap data defined\n");
 209                 return -EINVAL;
 210         }
 211
 212         row_shift = get_count_order(pdata->cols);
 213         max_keys = pdata->rows << row_shift;
 214
 215         keypad_data = kzalloc(sizeof(struct omap4_keypad) +
 216                                 max_keys * sizeof(keypad_data->keymap[0]),
 217                               GFP_KERNEL);
 218         if (!keypad_data) {
 219                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
 220                 return -ENOMEM;
 221         }
 222
 223         size = resource_size(res);
 224
 225         res = request_mem_region(res->start, size, pdev->name);
 226         if (!res) {
 227                 dev_err(&pdev->dev, "can't request mem region\n");
 228                 error = -EBUSY;
 229                 goto err_free_keypad;
 230         }
 231
 232         keypad_data->base = ioremap(res->start, resource_size(res));
 233         if (!keypad_data->base) {
 234                 dev_err(&pdev->dev, "can't ioremap mem resource\n");
 235                 error = -ENOMEM;
 236                 goto err_release_mem;
 237         }
 238
 239         keypad_data->irq = irq;
 240         keypad_data->row_shift = row_shift;
 241         keypad_data->rows = pdata->rows;
 242         keypad_data->cols = pdata->cols;
 243
 244         /* input device allocation */
 245         keypad_data->input = input_dev = input_allocate_device();
 246         if (!input_dev) {
 247                 error = -ENOMEM;
 248                 goto err_unmap;
 249         }
 250
 251         input_dev->name = pdev->name;
 252         input_dev->dev.parent = &pdev->dev;
 253         input_dev->id.bustype = BUS_HOST;
 254         input_dev->id.vendor = 0x0001;
 255         input_dev->id.product = 0x0001;
 256         input_dev->id.version = 0x0001;
 257
 258         input_dev->open = omap4_keypad_open;
 259         input_dev->close = omap4_keypad_close;
 260
 261         input_dev->keycode      = keypad_data->keymap;
 262         input_dev->keycodesize  = sizeof(keypad_data->keymap[0]);
 263         input_dev->keycodemax   = max_keys;
 264
 265         __set_bit(EV_KEY, input_dev->evbit);
 266         __set_bit(EV_REP, input_dev->evbit);
 267
 268         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 269
 270         input_set_drvdata(input_dev, keypad_data);
 271
 272         matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
 273                         input_dev->keycode, input_dev->keybit);
 274
 275         error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
 276                              IRQF_TRIGGER_RISING,
 277                              "omap4-keypad", keypad_data);
 278         if (error) {
 279                 dev_err(&pdev->dev, "failed to register interrupt\n");
 280                 goto err_free_input;
 281         }
 282
 283         pm_runtime_enable(&pdev->dev);
 284
 285         error = input_register_device(keypad_data->input);
 286         if (error < 0) {
 287                 dev_err(&pdev->dev, "failed to register input device\n");
 288                 goto err_pm_disable;
 289         }
 290
 291         platform_set_drvdata(pdev, keypad_data);
 292         return 0;
 293
 294 err_pm_disable:
 295         pm_runtime_disable(&pdev->dev);
 296         free_irq(keypad_data->irq, keypad_data);
 297 err_free_input:
 298         input_free_device(input_dev);
 299 err_unmap:
 300         iounmap(keypad_data->base);
 301 err_release_mem:
 302         release_mem_region(res->start, size);
 303 err_free_keypad:
 304         kfree(keypad_data);
 305         return error;
 306 }
 307
 308 static int __devexit omap4_keypad_remove(struct platform_device *pdev)
 309 {
 310         struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 311         struct resource *res;
 312
 313         free_irq(keypad_data->irq, keypad_data);
 314
 315         pm_runtime_disable(&pdev->dev);
 316
 317         input_unregister_device(keypad_data->input);
 318
 319         iounmap(keypad_data->base);
 320
 321         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 322         release_mem_region(res->start, resource_size(res));
 323
 324         kfree(keypad_data);
 325         platform_set_drvdata(pdev, NULL);
 326
 327         return 0;
 328 }
 329
 330 static struct platform_driver omap4_keypad_driver = {
 331         .probe          = omap4_keypad_probe,
 332         .remove         = __devexit_p(omap4_keypad_remove),
 333         .driver         = {
 334                 .name   = "omap4-keypad",
 335                 .owner  = THIS_MODULE,
 336         },
 337 };
 338 module_platform_driver(omap4_keypad_driver);
 339
 340 MODULE_AUTHOR("Texas Instruments");
 341 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
 342 MODULE_LICENSE("GPL");
 343 MODULE_ALIAS("platform:omap4-keypad");