drivers/input/keyboard/adp5520-keys.c

   1 /*
   2  * Keypad driver for Analog Devices ADP5520 MFD PMICs
   3  *
   4  * Copyright 2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/input.h>
  13 #include <linux/mfd/adp5520.h>
  14 #include <linux/slab.h>
  15
  16 struct adp5520_keys {
  17         struct input_dev *input;
  18         struct notifier_block notifier;
  19         struct device *master;
  20         unsigned short keycode[ADP5520_KEYMAPSIZE];
  21 };
  22
  23 static void adp5520_keys_report_event(struct adp5520_keys *dev,
  24                                         unsigned short keymask, int value)
  25 {
  26         int i;
  27
  28         for (i = 0; i < ADP5520_MAXKEYS; i++)
  29                 if (keymask & (1 << i))
  30                         input_report_key(dev->input, dev->keycode[i], value);
  31
  32         input_sync(dev->input);
  33 }
  34
  35 static int adp5520_keys_notifier(struct notifier_block *nb,
  36                                  unsigned long event, void *data)
  37 {
  38         struct adp5520_keys *dev;
  39         uint8_t reg_val_lo, reg_val_hi;
  40         unsigned short keymask;
  41
  42         dev = container_of(nb, struct adp5520_keys, notifier);
  43
  44         if (event & ADP5520_KP_INT) {
  45                 adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
  46                 adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
  47
  48                 keymask = (reg_val_hi << 8) | reg_val_lo;
  49                 /* Read twice to clear */
  50                 adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
  51                 adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
  52                 keymask |= (reg_val_hi << 8) | reg_val_lo;
  53                 adp5520_keys_report_event(dev, keymask, 1);
  54         }
  55
  56         if (event & ADP5520_KR_INT) {
  57                 adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
  58                 adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
  59
  60                 keymask = (reg_val_hi << 8) | reg_val_lo;
  61                 /* Read twice to clear */
  62                 adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
  63                 adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
  64                 keymask |= (reg_val_hi << 8) | reg_val_lo;
  65                 adp5520_keys_report_event(dev, keymask, 0);
  66         }
  67
  68         return 0;
  69 }
  70
  71 static int adp5520_keys_probe(struct platform_device *pdev)
  72 {
  73         struct adp5520_keys_platform_data *pdata = dev_get_platdata(&pdev->dev);
  74         struct input_dev *input;
  75         struct adp5520_keys *dev;
  76         int ret, i;
  77         unsigned char en_mask, ctl_mask = 0;
  78
  79         if (pdev->id != ID_ADP5520) {
  80                 dev_err(&pdev->dev, "only ADP5520 supports Keypad\n");
  81                 return -EINVAL;
  82         }
  83
  84         if (pdata == NULL) {
  85                 dev_err(&pdev->dev, "missing platform data\n");
  86                 return -EINVAL;
  87         }
  88
  89         if (!(pdata->rows_en_mask && pdata->cols_en_mask))
  90                 return -EINVAL;
  91
  92         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
  93         if (dev == NULL) {
  94                 dev_err(&pdev->dev, "failed to alloc memory\n");
  95                 return -ENOMEM;
  96         }
  97
  98         input = input_allocate_device();
  99         if (!input) {
 100                 ret = -ENOMEM;
 101                 goto err;
 102         }
 103
 104         dev->master = pdev->dev.parent;
 105         dev->input = input;
 106
 107         input->name = pdev->name;
 108         input->phys = "adp5520-keys/input0";
 109         input->dev.parent = &pdev->dev;
 110
 111         input_set_drvdata(input, dev);
 112
 113         input->id.bustype = BUS_I2C;
 114         input->id.vendor = 0x0001;
 115         input->id.product = 0x5520;
 116         input->id.version = 0x0001;
 117
 118         input->keycodesize = sizeof(dev->keycode[0]);
 119         input->keycodemax = pdata->keymapsize;
 120         input->keycode = dev->keycode;
 121
 122         memcpy(dev->keycode, pdata->keymap,
 123                 pdata->keymapsize * input->keycodesize);
 124
 125         /* setup input device */
 126         __set_bit(EV_KEY, input->evbit);
 127
 128         if (pdata->repeat)
 129                 __set_bit(EV_REP, input->evbit);
 130
 131         for (i = 0; i < input->keycodemax; i++)
 132                 __set_bit(dev->keycode[i], input->keybit);
 133         __clear_bit(KEY_RESERVED, input->keybit);
 134
 135         ret = input_register_device(input);
 136         if (ret) {
 137                 dev_err(&pdev->dev, "unable to register input device\n");
 138                 goto err;
 139         }
 140
 141         en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
 142
 143         ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
 144
 145         if (en_mask & ADP5520_COL_C3)
 146                 ctl_mask |= ADP5520_C3_MODE;
 147
 148         if (en_mask & ADP5520_ROW_R3)
 149                 ctl_mask |= ADP5520_R3_MODE;
 150
 151         if (ctl_mask)
 152                 ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
 153                         ctl_mask);
 154
 155         ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
 156                 pdata->rows_en_mask);
 157
 158         if (ret) {
 159                 dev_err(&pdev->dev, "failed to write\n");
 160                 ret = -EIO;
 161                 goto err1;
 162         }
 163
 164         dev->notifier.notifier_call = adp5520_keys_notifier;
 165         ret = adp5520_register_notifier(dev->master, &dev->notifier,
 166                         ADP5520_KP_IEN | ADP5520_KR_IEN);
 167         if (ret) {
 168                 dev_err(&pdev->dev, "failed to register notifier\n");
 169                 goto err1;
 170         }
 171
 172         platform_set_drvdata(pdev, dev);
 173         return 0;
 174
 175 err1:
 176         input_unregister_device(input);
 177         input = NULL;
 178 err:
 179         input_free_device(input);
 180         kfree(dev);
 181         return ret;
 182 }
 183
 184 static int adp5520_keys_remove(struct platform_device *pdev)
 185 {
 186         struct adp5520_keys *dev = platform_get_drvdata(pdev);
 187
 188         adp5520_unregister_notifier(dev->master, &dev->notifier,
 189                                 ADP5520_KP_IEN | ADP5520_KR_IEN);
 190
 191         input_unregister_device(dev->input);
 192         kfree(dev);
 193         return 0;
 194 }
 195
 196 static struct platform_driver adp5520_keys_driver = {
 197         .driver = {
 198                 .name   = "adp5520-keys",
 199                 .owner  = THIS_MODULE,
 200         },
 201         .probe          = adp5520_keys_probe,
 202         .remove         = adp5520_keys_remove,
 203 };
 204 module_platform_driver(adp5520_keys_driver);
 205
 206 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 207 MODULE_DESCRIPTION("Keys ADP5520 Driver");
 208 MODULE_LICENSE("GPL");
 209 MODULE_ALIAS("platform:adp5520-keys");