drivers/input/keyboard/adp5520-keys.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Keypad driver for Analog Devices ADP5520 MFD PMICs
   4  *
   5  * Copyright 2009 Analog Devices Inc.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/input.h>
  12 #include <linux/mfd/adp5520.h>
  13 #include <linux/slab.h>
  14 #include <linux/device.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) {
  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 = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
  93         if (!dev) {
  94                 dev_err(&pdev->dev, "failed to alloc memory\n");
  95                 return -ENOMEM;
  96         }
  97
  98         input = devm_input_allocate_device(&pdev->dev);
  99         if (!input)
 100                 return -ENOMEM;
 101
 102         dev->master = pdev->dev.parent;
 103         dev->input = input;
 104
 105         input->name = pdev->name;
 106         input->phys = "adp5520-keys/input0";
 107         input->dev.parent = &pdev->dev;
 108
 109         input->id.bustype = BUS_I2C;
 110         input->id.vendor = 0x0001;
 111         input->id.product = 0x5520;
 112         input->id.version = 0x0001;
 113
 114         input->keycodesize = sizeof(dev->keycode[0]);
 115         input->keycodemax = pdata->keymapsize;
 116         input->keycode = dev->keycode;
 117
 118         memcpy(dev->keycode, pdata->keymap,
 119                 pdata->keymapsize * input->keycodesize);
 120
 121         /* setup input device */
 122         __set_bit(EV_KEY, input->evbit);
 123
 124         if (pdata->repeat)
 125                 __set_bit(EV_REP, input->evbit);
 126
 127         for (i = 0; i < input->keycodemax; i++)
 128                 __set_bit(dev->keycode[i], input->keybit);
 129         __clear_bit(KEY_RESERVED, input->keybit);
 130
 131         ret = input_register_device(input);
 132         if (ret) {
 133                 dev_err(&pdev->dev, "unable to register input device\n");
 134                 return ret;
 135         }
 136
 137         en_mask = pdata->rows_en_mask | pdata->cols_en_mask;
 138
 139         ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);
 140
 141         if (en_mask & ADP5520_COL_C3)
 142                 ctl_mask |= ADP5520_C3_MODE;
 143
 144         if (en_mask & ADP5520_ROW_R3)
 145                 ctl_mask |= ADP5520_R3_MODE;
 146
 147         if (ctl_mask)
 148                 ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
 149                         ctl_mask);
 150
 151         ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
 152                 pdata->rows_en_mask);
 153
 154         if (ret) {
 155                 dev_err(&pdev->dev, "failed to write\n");
 156                 return -EIO;
 157         }
 158
 159         dev->notifier.notifier_call = adp5520_keys_notifier;
 160         ret = adp5520_register_notifier(dev->master, &dev->notifier,
 161                         ADP5520_KP_IEN | ADP5520_KR_IEN);
 162         if (ret) {
 163                 dev_err(&pdev->dev, "failed to register notifier\n");
 164                 return ret;
 165         }
 166
 167         platform_set_drvdata(pdev, dev);
 168         return 0;
 169 }
 170
 171 static int adp5520_keys_remove(struct platform_device *pdev)
 172 {
 173         struct adp5520_keys *dev = platform_get_drvdata(pdev);
 174
 175         adp5520_unregister_notifier(dev->master, &dev->notifier,
 176                                 ADP5520_KP_IEN | ADP5520_KR_IEN);
 177
 178         return 0;
 179 }
 180
 181 static struct platform_driver adp5520_keys_driver = {
 182         .driver = {
 183                 .name   = "adp5520-keys",
 184         },
 185         .probe          = adp5520_keys_probe,
 186         .remove         = adp5520_keys_remove,
 187 };
 188 module_platform_driver(adp5520_keys_driver);
 189
 190 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 191 MODULE_DESCRIPTION("Keys ADP5520 Driver");
 192 MODULE_LICENSE("GPL");
 193 MODULE_ALIAS("platform:adp5520-keys");