target/linux/au1000-2.6/patches/006-mtx1_system_button.patch

   1 diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/irqmap.c linux-2.6.16.7.new/arch/mips/au1000/mtx-1/irqmap.c
   2 --- linux-2.6.16.7/arch/mips/au1000/mtx-1/irqmap.c      2006-04-17 23:53:25.000000000 +0200
   3 +++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/irqmap.c  2006-04-23 11:54:31.000000000 +0200
   4 @@ -64,6 +64,7 @@
   5         { AU1500_GPIO_202, INTC_INT_LOW_LEVEL, 0 },
   6         { AU1500_GPIO_203, INTC_INT_LOW_LEVEL, 0 },
   7         { AU1500_GPIO_205, INTC_INT_LOW_LEVEL, 0 },
   8 +       { AU1500_GPIO_207, INTC_INT_RISE_AND_FALL_EDGE, 0 },
   9  };
  10
  11  int au1xxx_nr_irqs = sizeof(au1xxx_irq_map)/sizeof(au1xxx_irq_map_t);
  12 diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/Makefile linux-2.6.16.7.new/arch/mips/au1000/mtx-1/Makefile
  13 --- linux-2.6.16.7/arch/mips/au1000/mtx-1/Makefile      2006-04-17 23:53:25.000000000 +0200
  14 +++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/Makefile  2006-04-23 14:01:36.000000000 +0200
  15 @@ -8,3 +8,4 @@
  16  #
  17
  18  lib-y := init.o board_setup.o irqmap.o
  19 +obj-y := mtx-1_sysbtn.o
  20 diff -urN linux-2.6.16.7/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c linux-2.6.16.7.new/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c
  21 --- linux-2.6.16.7/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c        1970-01-01 01:00:00.000000000 +0100
  22 +++ linux-2.6.16.7.new/arch/mips/au1000/mtx-1/mtx-1_sysbtn.c    2006-04-23 14:01:17.000000000 +0200
  23 @@ -0,0 +1,218 @@
  24 +/*
  25 + *      Driver for the MTX-1 System Button.
  26 + *
  27 + *      (c) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.
  28 + *                              http://www.4g-systems.biz
  29 + *
  30 + *      This program is free software; you can redistribute it and/or
  31 + *      modify it under the terms of the GNU General Public License
  32 + *      as published by the Free Software Foundation; either version
  33 + *      2 of the License, or (at your option) any later version.
  34 + *
  35 + *      Neither Michael Stickel nor 4G Systeme GmbH admit liability nor provide
  36 + *      warranty for any of this software. This material is provided
  37 + *      "AS-IS" and at no charge.
  38 + *
  39 + *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
  40 + *
  41 + *      Release 0.01.
  42 + *
  43 + *      Author: Michael Stickel  michael.stickel@4g-systems.biz
  44 + *
  45 + *
  46 + *      After the module is loaded there is a device /dev/misc/btn
  47 + *      that can be read. It returns one char '1' if the button
  48 + *      has been pressed an '0' if it has been released.
  49 + */
  50 +#include <linux/autoconf.h>
  51 +#include <linux/module.h>
  52 +#include <linux/version.h>
  53 +#include <linux/types.h>
  54 +#include <linux/errno.h>
  55 +#include <linux/kernel.h>
  56 +#include <linux/poll.h>
  57 +#include <linux/sched.h>
  58 +#include <linux/miscdevice.h>
  59 +#include <linux/slab.h>
  60 +#include <linux/init.h>
  61 +#include <linux/irq.h>
  62 +#include <linux/interrupt.h>
  63 +
  64 +#include <asm/uaccess.h>
  65 +
  66 +#include <asm/mach-au1x00/au1000.h>
  67 +
  68 +
  69 +#ifndef FALSE
  70 +# define FALSE (0)
  71 +#endif
  72 +
  73 +#ifndef TRUE
  74 +# define TRUE (!FALSE)
  75 +#endif
  76 +
  77 +
  78 +//---------[ declarations ]-----------------
  79 +
  80 +
  81 +static DECLARE_WAIT_QUEUE_HEAD(mtx1btn_wait_queue);
  82 +static char state_changed;
  83 +static char last_value;
  84 +static char is_inuse;
  85 +
  86 +
  87 +//---------[ Hardware Functions ]-----------------
  88 +
  89 +// The MTX-1 Button is attached to GPIO207.
  90 +#define MTX1_GPIO2_SYSBTN (7)
  91 +#define MTX1_SYSBTN_IRQ   (AU1500_GPIO_207)
  92 +
  93 +
  94 +static char mtx1_getbtn (int btnno)
  95 +{
  96 +  if (btnno==0) {
  97 +    return (au_readl(GPIO2_PINSTATE) & (1<<MTX1_GPIO2_SYSBTN)) ? 0 : 1;
  98 +  }
  99 +  return 0;
 100 +}
 101 +
 102 +static void mtx1_initbuttons (void)
 103 +{
 104 +  au_writel (au_readl(GPIO2_DIR) & ~(1<<MTX1_GPIO2_SYSBTN), GPIO2_DIR);
 105 +}
 106 +
 107 +
 108 +//---------[ Interrupt handling ]-----------------
 109 +
 110 +
 111 +static void mtx1_btn_interrupt (int irq, void *private)
 112 +{
 113 +       char value = mtx1_getbtn(0);
 114 +       if (last_value != value)
 115 +       {
 116 +               last_value = value;
 117 +               state_changed = 1;
 118 +               wake_up (&mtx1btn_wait_queue);
 119 +       }
 120 +//     kill_fasync(&async_queue, SIGIO, POLL_OUT);
 121 +}
 122 +
 123 +
 124 +static int mtx1_btn_startirq (void)
 125 +{
 126 +       if (!request_irq (MTX1_SYSBTN_IRQ, mtx1_btn_interrupt, 0 /* | SA_INTERRUPT */, "mtx1btn", (void *)&state_changed)) {
 127 +               return 0;
 128 +    }
 129 +       return -1;
 130 +}
 131 +
 132 +static int mtx1_btn_stopirq  (void)
 133 +{
 134 +       free_irq(MTX1_SYSBTN_IRQ, (void *)&state_changed);
 135 +       return 0;
 136 +}
 137 +
 138 +
 139 +
 140 +//---------[ File Functions ]-----------------
 141 +
 142 +
 143 +static int mtx1sysbtn_minor = -1;
 144 +
 145 +
 146 +static int mtx1sysbtn_open (struct inode *inode, struct file *file)
 147 +{
 148 +       if (MINOR(inode->i_rdev)!=mtx1sysbtn_minor) return -ENODEV;
 149 +       if (is_inuse) return -EBUSY;
 150 +       is_inuse=1;
 151 +       last_value = mtx1_getbtn(0);
 152 +       state_changed = 0;
 153 +       return 0;
 154 +}
 155 +
 156 +
 157 +static int mtx1sysbtn_release (struct inode *inode, struct file *file) {
 158 +       if (MINOR(inode->i_rdev)==mtx1sysbtn_minor) {
 159 +               is_inuse=0;
 160 +       }
 161 +       return 0;
 162 +}
 163 +
 164 +
 165 +static ssize_t mtx1sysbtn_read (struct file *file, char *buf, size_t count, loff_t *ppos)
 166 +{
 167 +       if (count < 1)
 168 +               return -EINVAL;
 169 +       if (!state_changed)
 170 +               interruptible_sleep_on (&mtx1btn_wait_queue);
 171 +       state_changed = 0;
 172 +       char c = last_value ? '1' : '0'; /* mtx1_getbtn(0) */
 173 +       if(copy_to_user(buf, &c, 1))
 174 +               return -EFAULT;
 175 +       return 1;
 176 +}
 177 +
 178 +
 179 +static unsigned int mtx1sysbtn_poll (struct file *file, poll_table * wait)
 180 +{
 181 +  unsigned int mask = 0;
 182 +
 183 +  poll_wait (file, &mtx1btn_wait_queue, wait);
 184 +
 185 +  if (state_changed) // state changed since last time.
 186 +    mask |= POLLIN | POLLRDNORM;
 187 +
 188 +  return mask;
 189 +}
 190 +
 191 +
 192 +static struct file_operations mtx1sysbtn_fops = {
 193 +       .owner = THIS_MODULE,
 194 +       .read = mtx1sysbtn_read,
 195 +       .poll = mtx1sysbtn_poll,
 196 +       .open = mtx1sysbtn_open,
 197 +       .release = mtx1sysbtn_release
 198 +};
 199 +
 200 +
 201 +static struct miscdevice mtx1sysbtn_miscdev = {
 202 +       MISC_DYNAMIC_MINOR /* SYSBTN_MINOR */ ,
 203 +       "btn",
 204 +       &mtx1sysbtn_fops
 205 +};
 206 +
 207 +
 208 +
 209 +//---------[ Module Functions ]-----------------
 210 +
 211 +
 212 +void __exit exit_mtx1_sysbtn (void)
 213 +{
 214 +       is_inuse = 1;
 215 +       mtx1_btn_stopirq ();
 216 +       misc_deregister(&mtx1sysbtn_miscdev);
 217 +}
 218 +
 219 +
 220 +static int __init init_mtx1_sysbtn (void)
 221 +{
 222 +       printk("MTX-1 System Button driver\n");
 223 +       is_inuse = 1;
 224 +       mtx1_initbuttons ();
 225 +       if (misc_register (&mtx1sysbtn_miscdev) >= 0) {
 226 +               mtx1sysbtn_minor = mtx1sysbtn_miscdev.minor;
 227 +               if (mtx1_btn_startirq () == 0) {
 228 +                       is_inuse=0;
 229 +                       return 0;
 230 +               }
 231 +               misc_deregister(&mtx1sysbtn_miscdev);
 232 +       }
 233 +       return 1;
 234 +}
 235 +
 236 +module_init(init_mtx1_sysbtn);
 237 +module_exit(exit_mtx1_sysbtn);
 238 +
 239 +MODULE_AUTHOR("Michael Stickel");
 240 +MODULE_DESCRIPTION("Driver for the MTX-1 system button");
 241 +MODULE_LICENSE("GPL");