drivers/input/keyboard/sh_keysc.c

   1 /*
   2  * SuperH KEYSC Keypad Driver
   3  *
   4  * Copyright (C) 2008 Magnus Damm
   5  *
   6  * Based on gpio_keys.c, Copyright 2005 Phil Blundell
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18 #include <linux/delay.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/input.h>
  21 #include <linux/input/sh_keysc.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/io.h>
  25 #include <linux/slab.h>
  26
  27 static const struct {
  28         unsigned char kymd, keyout, keyin;
  29 } sh_keysc_mode[] = {
  30         [SH_KEYSC_MODE_1] = { 0, 6, 5 },
  31         [SH_KEYSC_MODE_2] = { 1, 5, 6 },
  32         [SH_KEYSC_MODE_3] = { 2, 4, 7 },
  33         [SH_KEYSC_MODE_4] = { 3, 6, 6 },
  34         [SH_KEYSC_MODE_5] = { 4, 6, 7 },
  35         [SH_KEYSC_MODE_6] = { 5, 8, 8 },
  36 };
  37
  38 struct sh_keysc_priv {
  39         void __iomem *iomem_base;
  40         DECLARE_BITMAP(last_keys, SH_KEYSC_MAXKEYS);
  41         struct input_dev *input;
  42         struct sh_keysc_info pdata;
  43 };
  44
  45 #define KYCR1 0
  46 #define KYCR2 1
  47 #define KYINDR 2
  48 #define KYOUTDR 3
  49
  50 #define KYCR2_IRQ_LEVEL    0x10
  51 #define KYCR2_IRQ_DISABLED 0x00
  52
  53 static unsigned long sh_keysc_read(struct sh_keysc_priv *p, int reg_nr)
  54 {
  55         return ioread16(p->iomem_base + (reg_nr << 2));
  56 }
  57
  58 static void sh_keysc_write(struct sh_keysc_priv *p, int reg_nr,
  59                            unsigned long value)
  60 {
  61         iowrite16(value, p->iomem_base + (reg_nr << 2));
  62 }
  63
  64 static void sh_keysc_level_mode(struct sh_keysc_priv *p,
  65                                 unsigned long keys_set)
  66 {
  67         struct sh_keysc_info *pdata = &p->pdata;
  68
  69         sh_keysc_write(p, KYOUTDR, 0);
  70         sh_keysc_write(p, KYCR2, KYCR2_IRQ_LEVEL | (keys_set << 8));
  71
  72         if (pdata->kycr2_delay)
  73                 udelay(pdata->kycr2_delay);
  74 }
  75
  76 static void sh_keysc_map_dbg(struct device *dev, unsigned long *map,
  77                              const char *str)
  78 {
  79         int k;
  80
  81         for (k = 0; k < BITS_TO_LONGS(SH_KEYSC_MAXKEYS); k++)
  82                 dev_dbg(dev, "%s[%d] 0x%lx\n", str, k, map[k]);
  83 }
  84
  85 static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
  86 {
  87         struct platform_device *pdev = dev_id;
  88         struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
  89         struct sh_keysc_info *pdata = &priv->pdata;
  90         int keyout_nr = sh_keysc_mode[pdata->mode].keyout;
  91         int keyin_nr = sh_keysc_mode[pdata->mode].keyin;
  92         DECLARE_BITMAP(keys, SH_KEYSC_MAXKEYS);
  93         DECLARE_BITMAP(keys0, SH_KEYSC_MAXKEYS);
  94         DECLARE_BITMAP(keys1, SH_KEYSC_MAXKEYS);
  95         unsigned char keyin_set, tmp;
  96         int i, k, n;
  97
  98         dev_dbg(&pdev->dev, "isr!\n");
  99
 100         bitmap_fill(keys1, SH_KEYSC_MAXKEYS);
 101         bitmap_zero(keys0, SH_KEYSC_MAXKEYS);
 102
 103         do {
 104                 bitmap_zero(keys, SH_KEYSC_MAXKEYS);
 105                 keyin_set = 0;
 106
 107                 sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
 108
 109                 for (i = 0; i < keyout_nr; i++) {
 110                         n = keyin_nr * i;
 111
 112                         /* drive one KEYOUT pin low, read KEYIN pins */
 113                         sh_keysc_write(priv, KYOUTDR, 0xffff ^ (3 << (i * 2)));
 114                         udelay(pdata->delay);
 115                         tmp = sh_keysc_read(priv, KYINDR);
 116
 117                         /* set bit if key press has been detected */
 118                         for (k = 0; k < keyin_nr; k++) {
 119                                 if (tmp & (1 << k))
 120                                         __set_bit(n + k, keys);
 121                         }
 122
 123                         /* keep track of which KEYIN bits that have been set */
 124                         keyin_set |= tmp ^ ((1 << keyin_nr) - 1);
 125                 }
 126
 127                 sh_keysc_level_mode(priv, keyin_set);
 128
 129                 bitmap_complement(keys, keys, SH_KEYSC_MAXKEYS);
 130                 bitmap_and(keys1, keys1, keys, SH_KEYSC_MAXKEYS);
 131                 bitmap_or(keys0, keys0, keys, SH_KEYSC_MAXKEYS);
 132
 133                 sh_keysc_map_dbg(&pdev->dev, keys, "keys");
 134
 135         } while (sh_keysc_read(priv, KYCR2) & 0x01);
 136
 137         sh_keysc_map_dbg(&pdev->dev, priv->last_keys, "last_keys");
 138         sh_keysc_map_dbg(&pdev->dev, keys0, "keys0");
 139         sh_keysc_map_dbg(&pdev->dev, keys1, "keys1");
 140
 141         for (i = 0; i < SH_KEYSC_MAXKEYS; i++) {
 142                 k = pdata->keycodes[i];
 143                 if (!k)
 144                         continue;
 145
 146                 if (test_bit(i, keys0) == test_bit(i, priv->last_keys))
 147                         continue;
 148
 149                 if (test_bit(i, keys1) || test_bit(i, keys0)) {
 150                         input_event(priv->input, EV_KEY, k, 1);
 151                         __set_bit(i, priv->last_keys);
 152                 }
 153
 154                 if (!test_bit(i, keys1)) {
 155                         input_event(priv->input, EV_KEY, k, 0);
 156                         __clear_bit(i, priv->last_keys);
 157                 }
 158
 159         }
 160         input_sync(priv->input);
 161
 162         return IRQ_HANDLED;
 163 }
 164
 165 static int sh_keysc_probe(struct platform_device *pdev)
 166 {
 167         struct sh_keysc_priv *priv;
 168         struct sh_keysc_info *pdata;
 169         struct resource *res;
 170         struct input_dev *input;
 171         int i;
 172         int irq, error;
 173
 174         if (!pdev->dev.platform_data) {
 175                 dev_err(&pdev->dev, "no platform data defined\n");
 176                 error = -EINVAL;
 177                 goto err0;
 178         }
 179
 180         error = -ENXIO;
 181         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 182         if (res == NULL) {
 183                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 184                 goto err0;
 185         }
 186
 187         irq = platform_get_irq(pdev, 0);
 188         if (irq < 0) {
 189                 dev_err(&pdev->dev, "failed to get irq\n");
 190                 goto err0;
 191         }
 192
 193         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 194         if (priv == NULL) {
 195                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 196                 error = -ENOMEM;
 197                 goto err0;
 198         }
 199
 200         platform_set_drvdata(pdev, priv);
 201         memcpy(&priv->pdata, pdev->dev.platform_data, sizeof(priv->pdata));
 202         pdata = &priv->pdata;
 203
 204         priv->iomem_base = ioremap_nocache(res->start, resource_size(res));
 205         if (priv->iomem_base == NULL) {
 206                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
 207                 error = -ENXIO;
 208                 goto err1;
 209         }
 210
 211         priv->input = input_allocate_device();
 212         if (!priv->input) {
 213                 dev_err(&pdev->dev, "failed to allocate input device\n");
 214                 error = -ENOMEM;
 215                 goto err2;
 216         }
 217
 218         input = priv->input;
 219         input->evbit[0] = BIT_MASK(EV_KEY);
 220
 221         input->name = pdev->name;
 222         input->phys = "sh-keysc-keys/input0";
 223         input->dev.parent = &pdev->dev;
 224
 225         input->id.bustype = BUS_HOST;
 226         input->id.vendor = 0x0001;
 227         input->id.product = 0x0001;
 228         input->id.version = 0x0100;
 229
 230         input->keycode = pdata->keycodes;
 231         input->keycodesize = sizeof(pdata->keycodes[0]);
 232         input->keycodemax = ARRAY_SIZE(pdata->keycodes);
 233
 234         error = request_threaded_irq(irq, NULL, sh_keysc_isr, IRQF_ONESHOT,
 235                                      dev_name(&pdev->dev), pdev);
 236         if (error) {
 237                 dev_err(&pdev->dev, "failed to request IRQ\n");
 238                 goto err3;
 239         }
 240
 241         for (i = 0; i < SH_KEYSC_MAXKEYS; i++)
 242                 __set_bit(pdata->keycodes[i], input->keybit);
 243         __clear_bit(KEY_RESERVED, input->keybit);
 244
 245         error = input_register_device(input);
 246         if (error) {
 247                 dev_err(&pdev->dev, "failed to register input device\n");
 248                 goto err4;
 249         }
 250
 251         pm_runtime_enable(&pdev->dev);
 252         pm_runtime_get_sync(&pdev->dev);
 253
 254         sh_keysc_write(priv, KYCR1, (sh_keysc_mode[pdata->mode].kymd << 8) |
 255                        pdata->scan_timing);
 256         sh_keysc_level_mode(priv, 0);
 257
 258         device_init_wakeup(&pdev->dev, 1);
 259
 260         return 0;
 261
 262  err4:
 263         free_irq(irq, pdev);
 264  err3:
 265         input_free_device(input);
 266  err2:
 267         iounmap(priv->iomem_base);
 268  err1:
 269         platform_set_drvdata(pdev, NULL);
 270         kfree(priv);
 271  err0:
 272         return error;
 273 }
 274
 275 static int sh_keysc_remove(struct platform_device *pdev)
 276 {
 277         struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
 278
 279         sh_keysc_write(priv, KYCR2, KYCR2_IRQ_DISABLED);
 280
 281         input_unregister_device(priv->input);
 282         free_irq(platform_get_irq(pdev, 0), pdev);
 283         iounmap(priv->iomem_base);
 284
 285         pm_runtime_put_sync(&pdev->dev);
 286         pm_runtime_disable(&pdev->dev);
 287
 288         platform_set_drvdata(pdev, NULL);
 289         kfree(priv);
 290
 291         return 0;
 292 }
 293
 294 #ifdef CONFIG_PM_SLEEP
 295 static int sh_keysc_suspend(struct device *dev)
 296 {
 297         struct platform_device *pdev = to_platform_device(dev);
 298         struct sh_keysc_priv *priv = platform_get_drvdata(pdev);
 299         int irq = platform_get_irq(pdev, 0);
 300         unsigned short value;
 301
 302         value = sh_keysc_read(priv, KYCR1);
 303
 304         if (device_may_wakeup(dev)) {
 305                 sh_keysc_write(priv, KYCR1, value | 0x80);
 306                 enable_irq_wake(irq);
 307         } else {
 308                 sh_keysc_write(priv, KYCR1, value & ~0x80);
 309                 pm_runtime_put_sync(dev);
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int sh_keysc_resume(struct device *dev)
 316 {
 317         struct platform_device *pdev = to_platform_device(dev);
 318         int irq = platform_get_irq(pdev, 0);
 319
 320         if (device_may_wakeup(dev))
 321                 disable_irq_wake(irq);
 322         else
 323                 pm_runtime_get_sync(dev);
 324
 325         return 0;
 326 }
 327 #endif
 328
 329 static SIMPLE_DEV_PM_OPS(sh_keysc_dev_pm_ops,
 330                          sh_keysc_suspend, sh_keysc_resume);
 331
 332 static struct platform_driver sh_keysc_device_driver = {
 333         .probe          = sh_keysc_probe,
 334         .remove         = sh_keysc_remove,
 335         .driver         = {
 336                 .name   = "sh_keysc",
 337                 .pm     = &sh_keysc_dev_pm_ops,
 338         }
 339 };
 340 module_platform_driver(sh_keysc_device_driver);
 341
 342 MODULE_AUTHOR("Magnus Damm");
 343 MODULE_DESCRIPTION("SuperH KEYSC Keypad Driver");
 344 MODULE_LICENSE("GPL");