drivers/mfd/ucb1x00-assabet.c

   1 /*
   2  *  linux/drivers/mfd/ucb1x00-assabet.c
   3  *
   4  *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License.
   9  *
  10  *  We handle the machine-specific bits of the UCB1x00 driver here.
  11  */
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15 #include <linux/err.h>
  16 #include <linux/fs.h>
  17 #include <linux/gpio_keys.h>
  18 #include <linux/input.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/mfd/ucb1x00.h>
  22
  23 #define UCB1X00_ATTR(name,input)\
  24 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
  25                            char *buf)   \
  26 {                                                               \
  27         struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
  28         int val;                                                \
  29         ucb1x00_adc_enable(ucb);                                \
  30         val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
  31         ucb1x00_adc_disable(ucb);                               \
  32         return sprintf(buf, "%d\n", val);                       \
  33 }                                                               \
  34 static DEVICE_ATTR(name,0444,name##_show,NULL)
  35
  36 UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
  37 UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
  38 UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
  39
  40 static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
  41 {
  42         struct ucb1x00 *ucb = dev->ucb;
  43         struct platform_device *pdev;
  44         struct gpio_keys_platform_data keys;
  45         static struct gpio_keys_button buttons[6];
  46         unsigned i;
  47
  48         memset(buttons, 0, sizeof(buttons));
  49         memset(&keys, 0, sizeof(keys));
  50
  51         for (i = 0; i < ARRAY_SIZE(buttons); i++) {
  52                 buttons[i].code = BTN_0 + i;
  53                 buttons[i].gpio = ucb->gpio.base + i;
  54                 buttons[i].type = EV_KEY;
  55                 buttons[i].can_disable = true;
  56         }
  57
  58         keys.buttons = buttons;
  59         keys.nbuttons = ARRAY_SIZE(buttons);
  60         keys.poll_interval = 50;
  61         keys.name = "ucb1x00";
  62
  63         pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
  64                 &keys, sizeof(keys));
  65
  66         device_create_file(&ucb->dev, &dev_attr_vbatt);
  67         device_create_file(&ucb->dev, &dev_attr_vcharger);
  68         device_create_file(&ucb->dev, &dev_attr_batt_temp);
  69
  70         dev->priv = pdev;
  71         return 0;
  72 }
  73
  74 static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
  75 {
  76         struct platform_device *pdev = dev->priv;
  77
  78         if (!IS_ERR(pdev))
  79                 platform_device_unregister(pdev);
  80
  81         device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
  82         device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
  83         device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
  84 }
  85
  86 static struct ucb1x00_driver ucb1x00_assabet_driver = {
  87         .add    = ucb1x00_assabet_add,
  88         .remove = ucb1x00_assabet_remove,
  89 };
  90
  91 static int __init ucb1x00_assabet_init(void)
  92 {
  93         return ucb1x00_register_driver(&ucb1x00_assabet_driver);
  94 }
  95
  96 static void __exit ucb1x00_assabet_exit(void)
  97 {
  98         ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
  99 }
 100
 101 module_init(ucb1x00_assabet_init);
 102 module_exit(ucb1x00_assabet_exit);
 103
 104 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 105 MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
 106 MODULE_LICENSE("GPL");