drivers/input/keyboard/adp5588-keys.c

   1 /*
   2  * File: drivers/input/keyboard/adp5588_keys.c
   3  * Description:  keypad driver for ADP5588 I2C QWERTY Keypad and IO Expander
   4  * Bugs: Enter bugs at http://blackfin.uclinux.org/
   5  *
   6  * Copyright (C) 2008-2009 Analog Devices Inc.
   7  * Licensed under the GPL-2 or later.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/version.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/irq.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/errno.h>
  17 #include <linux/pm.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/input.h>
  20 #include <linux/i2c.h>
  21
  22 #include <linux/i2c/adp5588.h>
  23
  24  /* Configuration Register1 */
  25 #define AUTO_INC        (1 << 7)
  26 #define GPIEM_CFG       (1 << 6)
  27 #define OVR_FLOW_M      (1 << 5)
  28 #define INT_CFG         (1 << 4)
  29 #define OVR_FLOW_IEN    (1 << 3)
  30 #define K_LCK_IM        (1 << 2)
  31 #define GPI_IEN         (1 << 1)
  32 #define KE_IEN          (1 << 0)
  33
  34 /* Interrupt Status Register */
  35 #define CMP2_INT        (1 << 5)
  36 #define CMP1_INT        (1 << 4)
  37 #define OVR_FLOW_INT    (1 << 3)
  38 #define K_LCK_INT       (1 << 2)
  39 #define GPI_INT         (1 << 1)
  40 #define KE_INT          (1 << 0)
  41
  42 /* Key Lock and Event Counter Register */
  43 #define K_LCK_EN        (1 << 6)
  44 #define LCK21           0x30
  45 #define KEC             0xF
  46
  47 /* Key Event Register xy */
  48 #define KEY_EV_PRESSED          (1 << 7)
  49 #define KEY_EV_MASK             (0x7F)
  50
  51 #define KP_SEL(x)               (0xFFFF >> (16 - x))    /* 2^x-1 */
  52
  53 #define KEYP_MAX_EVENT          10
  54
  55 /*
  56  * Early pre 4.0 Silicon required to delay readout by at least 25ms,
  57  * since the Event Counter Register updated 25ms after the interrupt
  58  * asserted.
  59  */
  60 #define WA_DELAYED_READOUT_REVID(rev)           ((rev) < 4)
  61
  62 struct adp5588_kpad {
  63         struct i2c_client *client;
  64         struct input_dev *input;
  65         struct delayed_work work;
  66         unsigned long delay;
  67         unsigned short keycode[ADP5588_KEYMAPSIZE];
  68 };
  69
  70 static int adp5588_read(struct i2c_client *client, u8 reg)
  71 {
  72         int ret = i2c_smbus_read_byte_data(client, reg);
  73
  74         if (ret < 0)
  75                 dev_err(&client->dev, "Read Error\n");
  76
  77         return ret;
  78 }
  79
  80 static int adp5588_write(struct i2c_client *client, u8 reg, u8 val)
  81 {
  82         return i2c_smbus_write_byte_data(client, reg, val);
  83 }
  84
  85 static void adp5588_work(struct work_struct *work)
  86 {
  87         struct adp5588_kpad *kpad = container_of(work,
  88                                                 struct adp5588_kpad, work.work);
  89         struct i2c_client *client = kpad->client;
  90         int i, key, status, ev_cnt;
  91
  92         status = adp5588_read(client, INT_STAT);
  93
  94         if (status & OVR_FLOW_INT)      /* Unlikely and should never happen */
  95                 dev_err(&client->dev, "Event Overflow Error\n");
  96
  97         if (status & KE_INT) {
  98                 ev_cnt = adp5588_read(client, KEY_LCK_EC_STAT) & KEC;
  99                 if (ev_cnt) {
 100                         for (i = 0; i < ev_cnt; i++) {
 101                                 key = adp5588_read(client, Key_EVENTA + i);
 102                                 input_report_key(kpad->input,
 103                                         kpad->keycode[(key & KEY_EV_MASK) - 1],
 104                                         key & KEY_EV_PRESSED);
 105                         }
 106                         input_sync(kpad->input);
 107                 }
 108         }
 109         adp5588_write(client, INT_STAT, status); /* Status is W1C */
 110 }
 111
 112 static irqreturn_t adp5588_irq(int irq, void *handle)
 113 {
 114         struct adp5588_kpad *kpad = handle;
 115
 116         /*
 117          * use keventd context to read the event fifo registers
 118          * Schedule readout at least 25ms after notification for
 119          * REVID < 4
 120          */
 121
 122         schedule_delayed_work(&kpad->work, kpad->delay);
 123
 124         return IRQ_HANDLED;
 125 }
 126
 127 static int __devinit adp5588_setup(struct i2c_client *client)
 128 {
 129         struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
 130         int i, ret;
 131
 132         ret = adp5588_write(client, KP_GPIO1, KP_SEL(pdata->rows));
 133         ret |= adp5588_write(client, KP_GPIO2, KP_SEL(pdata->cols) & 0xFF);
 134         ret |= adp5588_write(client, KP_GPIO3, KP_SEL(pdata->cols) >> 8);
 135
 136         if (pdata->en_keylock) {
 137                 ret |= adp5588_write(client, UNLOCK1, pdata->unlock_key1);
 138                 ret |= adp5588_write(client, UNLOCK2, pdata->unlock_key2);
 139                 ret |= adp5588_write(client, KEY_LCK_EC_STAT, K_LCK_EN);
 140         }
 141
 142         for (i = 0; i < KEYP_MAX_EVENT; i++)
 143                 ret |= adp5588_read(client, Key_EVENTA);
 144
 145         ret |= adp5588_write(client, INT_STAT, CMP2_INT | CMP1_INT |
 146                                         OVR_FLOW_INT | K_LCK_INT |
 147                                         GPI_INT | KE_INT); /* Status is W1C */
 148
 149         ret |= adp5588_write(client, CFG, INT_CFG | OVR_FLOW_IEN | KE_IEN);
 150
 151         if (ret < 0) {
 152                 dev_err(&client->dev, "Write Error\n");
 153                 return ret;
 154         }
 155
 156         return 0;
 157 }
 158
 159 static int __devinit adp5588_probe(struct i2c_client *client,
 160                                         const struct i2c_device_id *id)
 161 {
 162         struct adp5588_kpad *kpad;
 163         struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
 164         struct input_dev *input;
 165         unsigned int revid;
 166         int ret, i;
 167         int error;
 168
 169         if (!i2c_check_functionality(client->adapter,
 170                                         I2C_FUNC_SMBUS_BYTE_DATA)) {
 171                 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
 172                 return -EIO;
 173         }
 174
 175         if (!pdata) {
 176                 dev_err(&client->dev, "no platform data?\n");
 177                 return -EINVAL;
 178         }
 179
 180         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 181                 dev_err(&client->dev, "no rows, cols or keymap from pdata\n");
 182                 return -EINVAL;
 183         }
 184
 185         if (pdata->keymapsize != ADP5588_KEYMAPSIZE) {
 186                 dev_err(&client->dev, "invalid keymapsize\n");
 187                 return -EINVAL;
 188         }
 189
 190         if (!client->irq) {
 191                 dev_err(&client->dev, "no IRQ?\n");
 192                 return -EINVAL;
 193         }
 194
 195         kpad = kzalloc(sizeof(*kpad), GFP_KERNEL);
 196         input = input_allocate_device();
 197         if (!kpad || !input) {
 198                 error = -ENOMEM;
 199                 goto err_free_mem;
 200         }
 201
 202         kpad->client = client;
 203         kpad->input = input;
 204         INIT_DELAYED_WORK(&kpad->work, adp5588_work);
 205
 206         ret = adp5588_read(client, DEV_ID);
 207         if (ret < 0) {
 208                 error = ret;
 209                 goto err_free_mem;
 210         }
 211
 212         revid = (u8) ret & ADP5588_DEVICE_ID_MASK;
 213         if (WA_DELAYED_READOUT_REVID(revid))
 214                 kpad->delay = msecs_to_jiffies(30);
 215
 216         input->name = client->name;
 217         input->phys = "adp5588-keys/input0";
 218         input->dev.parent = &client->dev;
 219
 220         input_set_drvdata(input, kpad);
 221
 222         input->id.bustype = BUS_I2C;
 223         input->id.vendor = 0x0001;
 224         input->id.product = 0x0001;
 225         input->id.version = revid;
 226
 227         input->keycodesize = sizeof(kpad->keycode[0]);
 228         input->keycodemax = pdata->keymapsize;
 229         input->keycode = kpad->keycode;
 230
 231         memcpy(kpad->keycode, pdata->keymap,
 232                 pdata->keymapsize * input->keycodesize);
 233
 234         /* setup input device */
 235         __set_bit(EV_KEY, input->evbit);
 236
 237         if (pdata->repeat)
 238                 __set_bit(EV_REP, input->evbit);
 239
 240         for (i = 0; i < input->keycodemax; i++)
 241                 __set_bit(kpad->keycode[i] & KEY_MAX, input->keybit);
 242         __clear_bit(KEY_RESERVED, input->keybit);
 243
 244         error = input_register_device(input);
 245         if (error) {
 246                 dev_err(&client->dev, "unable to register input device\n");
 247                 goto err_free_mem;
 248         }
 249
 250         error = request_irq(client->irq, adp5588_irq,
 251                             IRQF_TRIGGER_FALLING | IRQF_DISABLED,
 252                             client->dev.driver->name, kpad);
 253         if (error) {
 254                 dev_err(&client->dev, "irq %d busy?\n", client->irq);
 255                 goto err_unreg_dev;
 256         }
 257
 258         error = adp5588_setup(client);
 259         if (error)
 260                 goto err_free_irq;
 261
 262         device_init_wakeup(&client->dev, 1);
 263         i2c_set_clientdata(client, kpad);
 264
 265         dev_info(&client->dev, "Rev.%d keypad, irq %d\n", revid, client->irq);
 266         return 0;
 267
 268  err_free_irq:
 269         free_irq(client->irq, kpad);
 270  err_unreg_dev:
 271         input_unregister_device(input);
 272         input = NULL;
 273  err_free_mem:
 274         input_free_device(input);
 275         kfree(kpad);
 276
 277         return error;
 278 }
 279
 280 static int __devexit adp5588_remove(struct i2c_client *client)
 281 {
 282         struct adp5588_kpad *kpad = i2c_get_clientdata(client);
 283
 284         adp5588_write(client, CFG, 0);
 285         free_irq(client->irq, kpad);
 286         cancel_delayed_work_sync(&kpad->work);
 287         input_unregister_device(kpad->input);
 288         i2c_set_clientdata(client, NULL);
 289         kfree(kpad);
 290
 291         return 0;
 292 }
 293
 294 #ifdef CONFIG_PM
 295 static int adp5588_suspend(struct device *dev)
 296 {
 297         struct adp5588_kpad *kpad = dev_get_drvdata(dev);
 298         struct i2c_client *client = kpad->client;
 299
 300         disable_irq(client->irq);
 301         cancel_delayed_work_sync(&kpad->work);
 302
 303         if (device_may_wakeup(&client->dev))
 304                 enable_irq_wake(client->irq);
 305
 306         return 0;
 307 }
 308
 309 static int adp5588_resume(struct device *dev)
 310 {
 311         struct adp5588_kpad *kpad = dev_get_drvdata(dev);
 312         struct i2c_client *client = kpad->client;
 313
 314         if (device_may_wakeup(&client->dev))
 315                 disable_irq_wake(client->irq);
 316
 317         enable_irq(client->irq);
 318
 319         return 0;
 320 }
 321
 322 static struct dev_pm_ops adp5588_dev_pm_ops = {
 323         .suspend = adp5588_suspend,
 324         .resume  = adp5588_resume,
 325 };
 326 #endif
 327
 328 static const struct i2c_device_id adp5588_id[] = {
 329         { KBUILD_MODNAME, 0 },
 330         { }
 331 };
 332 MODULE_DEVICE_TABLE(i2c, adp5588_id);
 333
 334 static struct i2c_driver adp5588_driver = {
 335         .driver = {
 336                 .name = KBUILD_MODNAME,
 337 #ifdef CONFIG_PM
 338                 .pm   = &adp5588_dev_pm_ops,
 339 #endif
 340         },
 341         .probe    = adp5588_probe,
 342         .remove   = __devexit_p(adp5588_remove),
 343         .id_table = adp5588_id,
 344 };
 345
 346 static int __init adp5588_init(void)
 347 {
 348         return i2c_add_driver(&adp5588_driver);
 349 }
 350 module_init(adp5588_init);
 351
 352 static void __exit adp5588_exit(void)
 353 {
 354         i2c_del_driver(&adp5588_driver);
 355 }
 356 module_exit(adp5588_exit);
 357
 358 MODULE_LICENSE("GPL");
 359 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 360 MODULE_DESCRIPTION("ADP5588 Keypad driver");
 361 MODULE_ALIAS("platform:adp5588-keys");