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/fs.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/device.h>
  17
  18 #include <asm/dma.h>
  19
  20 #include "ucb1x00.h"
  21
  22 #define UCB1X00_ATTR(name,input)\
  23 static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
  24                            char *buf)   \
  25 {                                                               \
  26         struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
  27         int val;                                                \
  28         ucb1x00_adc_enable(ucb);                                \
  29         val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
  30         ucb1x00_adc_disable(ucb);                               \
  31         return sprintf(buf, "%d\n", val);                       \
  32 }                                                               \
  33 static DEVICE_ATTR(name,0444,name##_show,NULL)
  34
  35 UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
  36 UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
  37 UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
  38
  39 static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
  40 {
  41         device_create_file(&dev->ucb->dev, &dev_attr_vbatt);
  42         device_create_file(&dev->ucb->dev, &dev_attr_vcharger);
  43         device_create_file(&dev->ucb->dev, &dev_attr_batt_temp);
  44         return 0;
  45 }
  46
  47 static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
  48 {
  49         device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
  50         device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
  51         device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
  52 }
  53
  54 static struct ucb1x00_driver ucb1x00_assabet_driver = {
  55         .add    = ucb1x00_assabet_add,
  56         .remove = ucb1x00_assabet_remove,
  57 };
  58
  59 static int __init ucb1x00_assabet_init(void)
  60 {
  61         return ucb1x00_register_driver(&ucb1x00_assabet_driver);
  62 }
  63
  64 static void __exit ucb1x00_assabet_exit(void)
  65 {
  66         ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
  67 }
  68
  69 module_init(ucb1x00_assabet_init);
  70 module_exit(ucb1x00_assabet_exit);
  71
  72 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
  73 MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
  74 MODULE_LICENSE("GPL");