drivers/mfd/ucb1x00-assabet.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/mfd/ucb1x00-assabet.c
   4  *
   5  *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
   6  *
   7  *  We handle the machine-specific bits of the UCB1x00 driver here.
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/device.h>
  12 #include <linux/err.h>
  13 #include <linux/fs.h>
  14 #include <linux/gpio_keys.h>
  15 #include <linux/input.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/mfd/ucb1x00.h>
  19
  20 #define UCB1X00_ATTR(name,input)\
  21 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
  22                            char *buf)   \
  23 {                                                               \
  24         struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
  25         int val;                                                \
  26         ucb1x00_adc_enable(ucb);                                \
  27         val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
  28         ucb1x00_adc_disable(ucb);                               \
  29         return sprintf(buf, "%d\n", val);                       \
  30 }                                                               \
  31 static DEVICE_ATTR_RO(name)
  32
  33 UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
  34 UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
  35 UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
  36
  37 static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
  38 {
  39         struct ucb1x00 *ucb = dev->ucb;
  40         struct platform_device *pdev;
  41         struct gpio_keys_platform_data keys;
  42         static struct gpio_keys_button buttons[6];
  43         unsigned i;
  44
  45         memset(buttons, 0, sizeof(buttons));
  46         memset(&keys, 0, sizeof(keys));
  47
  48         for (i = 0; i < ARRAY_SIZE(buttons); i++) {
  49                 buttons[i].code = BTN_0 + i;
  50                 buttons[i].gpio = ucb->gpio.base + i;
  51                 buttons[i].type = EV_KEY;
  52                 buttons[i].can_disable = true;
  53         }
  54
  55         keys.buttons = buttons;
  56         keys.nbuttons = ARRAY_SIZE(buttons);
  57         keys.poll_interval = 50;
  58         keys.name = "ucb1x00";
  59
  60         pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
  61                 &keys, sizeof(keys));
  62
  63         device_create_file(&ucb->dev, &dev_attr_vbatt);
  64         device_create_file(&ucb->dev, &dev_attr_vcharger);
  65         device_create_file(&ucb->dev, &dev_attr_batt_temp);
  66
  67         dev->priv = pdev;
  68         return 0;
  69 }
  70
  71 static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
  72 {
  73         struct platform_device *pdev = dev->priv;
  74
  75         if (!IS_ERR(pdev))
  76                 platform_device_unregister(pdev);
  77
  78         device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
  79         device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
  80         device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
  81 }
  82
  83 static struct ucb1x00_driver ucb1x00_assabet_driver = {
  84         .add    = ucb1x00_assabet_add,
  85         .remove = ucb1x00_assabet_remove,
  86 };
  87
  88 static int __init ucb1x00_assabet_init(void)
  89 {
  90         return ucb1x00_register_driver(&ucb1x00_assabet_driver);
  91 }
  92
  93 static void __exit ucb1x00_assabet_exit(void)
  94 {
  95         ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
  96 }
  97
  98 module_init(ucb1x00_assabet_init);
  99 module_exit(ucb1x00_assabet_exit);
 100
 101 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 102 MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
 103 MODULE_LICENSE("GPL");