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