target/linux/adm8668/files/arch/mips/adm8668/proc.c

   1 /*
   2  * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/proc_fs.h>
  13 #include <asm/uaccess.h>
  14 #include <adm8668.h>
  15
  16 int adm8668_sesled_write_proc(struct file *file, const char *buffer, unsigned long count, void *data)
  17 {
  18         char buf[8];
  19         int num;
  20
  21         num = (count < 8) ? count : 8;
  22
  23         if (copy_from_user(buf, buffer, num))
  24         {
  25                 printk("copy_from_user failed");
  26                 return -EFAULT;
  27         }
  28         num = simple_strtoul(buf, NULL, 16);
  29         switch (num)
  30         {
  31                 case 0:
  32                         GPIO_SET_LOW(0);
  33                         CRGPIO_SET_LOW(2);
  34                         break;
  35                 case 1:
  36                         GPIO_SET_LOW(0);
  37                         CRGPIO_SET_HI(2);
  38                         break;
  39                 case 2:
  40                         GPIO_SET_HI(0);
  41                         CRGPIO_SET_HI(2);
  42                         break;
  43                 default:
  44                         break;
  45         }
  46
  47         return count;
  48 }
  49
  50 int adm8668_sesled_read_proc(char *buf, char **start, off_t offset, int count, int *eof, void *data)
  51 {
  52         int len = 0;
  53         int led_state = 0;
  54
  55         led_state = (ADM8668_CONFIG_REG(CRGPIO_REG) & 0x100) ? 1 : 0;
  56         led_state += (ADM8668_WLAN_REG(GPIO_REG) & 0x40) ? 2 : 0;
  57         len += sprintf(buf+len, "%s\n",
  58                 (led_state&1) ?
  59                         ((led_state&2) ? "ORANGE" : "GREEN") : "OFF");
  60
  61         return len;
  62 }
  63
  64 int adm8668_button_read_proc(char *buf, char **start, off_t offset,
  65         int count, int *eof, void *data)
  66 {
  67         int len = 0;
  68         int read_once = ADM8668_CONFIG_REG(CRGPIO_REG);
  69         int button_flip = (read_once >> 20) & 0x3;
  70         int button_state = read_once & 0x3;
  71
  72         len += sprintf(buf+len, "SES: %s %s\nRESET: %s %s\n",
  73                 (button_state&2) ? "UP" : "DOWN",
  74                 (button_flip&2) ? "FLIP" : "",
  75                 (button_state&1) ? "UP" : "DOWN",
  76                 (button_flip&1) ? "FLIP" : "");
  77
  78         return len;
  79 }
  80
  81 int __init adm8668_init_proc(void)
  82 {
  83         struct proc_dir_entry *adm8668_proc_dir = NULL;
  84         struct proc_dir_entry *sesled = NULL;
  85         int __maybe_unused bogus;
  86
  87         /* these are known to be lights. rest are input...? */
  88         ADM8668_CONFIG_REG(CRGPIO_REG)  = GPIO2_OUTPUT_ENABLE;
  89         ADM8668_WLAN_REG(GPIO_REG)      = GPIO0_OUTPUT_ENABLE;
  90
  91         /* inital read off of the flipper switcher on the button thingie */
  92         bogus = ADM8668_CONFIG_REG(CRGPIO_REG);
  93
  94         adm8668_proc_dir = proc_mkdir("adm8668", 0);
  95         if (adm8668_proc_dir == NULL) {
  96                 printk(KERN_ERR "ADM8668 proc: unable to create proc dir.\n");
  97                 return 0;
  98         }
  99         create_proc_read_entry("buttons", 0444, adm8668_proc_dir,
 100                                         adm8668_button_read_proc, NULL);
 101         sesled = create_proc_entry("sesled", S_IRUGO|S_IWUGO, adm8668_proc_dir);
 102         if (sesled) {
 103                 sesled->read_proc = adm8668_sesled_read_proc;
 104                 sesled->write_proc = adm8668_sesled_write_proc;
 105         }
 106
 107         return 0;
 108 }
 109
 110 module_init(adm8668_init_proc);
 111
 112 MODULE_LICENSE("GPL");
 113 MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");
 114 MODULE_DESCRIPTION("ADM8668 ghetto button driver");