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