target/linux/ixp4xx/patches-2.6.23/017-nas100d_auto_power_on.patch

   1 Upgrade the power and reset button handling for the NAS100D:
   2  * Convert GPIO and IRQ handling to use the <asm/gpio.h> api.
   3  * Perform the reset only after the power button has been held down
   4    for at least two seconds.  Do the reset on the release of the power
   5    button, so that NAS devices which have been set to auto-power-on (by
   6    bridging the power button) do not continuously power cycle.
   7  * Remove all superflous constants from nas100d.h
   8  * Add LED constants to nas100d.h while we're there.
   9 Also, update the board LED setup code to use constants.
  10
  11 Signed-off-by: Rod Whitby <rod@whitby.id.au>
  12
  13 Index: linux-2.6.23.17/arch/arm/mach-ixp4xx/nas100d-power.c
  14 ===================================================================
  15 --- linux-2.6.23.17.orig/arch/arm/mach-ixp4xx/nas100d-power.c
  16 +++ linux-2.6.23.17/arch/arm/mach-ixp4xx/nas100d-power.c
  17 @@ -21,15 +21,61 @@
  18  #include <linux/irq.h>
  19  #include <linux/module.h>
  20  #include <linux/reboot.h>
  21 +#include <linux/jiffies.h>
  22 +#include <linux/timer.h>
  23
  24 +#include <asm/gpio.h>
  25  #include <asm/mach-types.h>
  26
  27 -static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
  28 +extern void ctrl_alt_del(void);
  29 +
  30 +/* This is used to make sure the power-button pusher is serious.  The button
  31 + * must be held until the value of this counter reaches zero.
  32 + */
  33 +static volatile int power_button_countdown;
  34 +
  35 +/* Must hold the button down for at least this many counts to be processed */
  36 +#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
  37 +
  38 +static void nas100d_power_handler(unsigned long data);
  39 +static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
  40 +
  41 +static void nas100d_power_handler(unsigned long data)
  42  {
  43 -       /* Signal init to do the ctrlaltdel action, this will bypass init if
  44 -        * it hasn't started and do a kernel_restart.
  45 +       /* This routine is called twice per second to check the
  46 +        * state of the power button.
  47          */
  48 -       ctrl_alt_del();
  49 +
  50 +       if (gpio_get_value(NAS100D_PB_GPIO)) {
  51 +
  52 +               /* IO Pin is 1 (button pushed) */
  53 +               if (power_button_countdown > 0) {
  54 +                       power_button_countdown--;
  55 +               }
  56 +
  57 +       } else {
  58 +
  59 +               /* Done on button release, to allow for auto-power-on mods. */
  60 +               if (power_button_countdown == 0) {
  61 +                       /* Signal init to do the ctrlaltdel action, this will bypass
  62 +                        * init if it hasn't started and do a kernel_restart.
  63 +                        */
  64 +                       ctrl_alt_del();
  65 +
  66 +                       /* Change the state of the power LED to "blink" */
  67 +                       gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
  68 +               } else {
  69 +                       power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
  70 +               }
  71 +       }
  72 +
  73 +       mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
  74 +}
  75 +
  76 +static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
  77 +{
  78 +       /* This is the paper-clip reset, it shuts the machine down directly. */
  79 +       machine_power_off();
  80
  81         return IRQ_HANDLED;
  82  }
  83 @@ -39,17 +85,30 @@ static int __init nas100d_power_init(voi
  84         if (!(machine_is_nas100d()))
  85                 return 0;
  86
  87 -       set_irq_type(NAS100D_RB_IRQ, IRQT_LOW);
  88 +       set_irq_type(gpio_to_irq(NAS100D_RB_GPIO), IRQT_LOW);
  89
  90 -       if (request_irq(NAS100D_RB_IRQ, &nas100d_reset_handler,
  91 +       if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
  92                 IRQF_DISABLED, "NAS100D reset button", NULL) < 0) {
  93
  94                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
  95 -                       NAS100D_RB_IRQ);
  96 +                       gpio_to_irq(NAS100D_RB_GPIO));
  97
  98                 return -EIO;
  99         }
 100
 101 +       /* The power button on the Iomega NAS100d is on GPIO 14, but
 102 +        * it cannot handle interrupts on that GPIO line.  So we'll
 103 +        * have to poll it with a kernel timer.
 104 +        */
 105 +
 106 +       /* Make sure that the power button GPIO is set up as an input */
 107 +       gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
 108 +
 109 +       /* Set the initial value for the power button IRQ handler */
 110 +       power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 111 +
 112 +       mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 113 +
 114         return 0;
 115  }
 116
 117 @@ -58,7 +117,9 @@ static void __exit nas100d_power_exit(vo
 118         if (!(machine_is_nas100d()))
 119                 return;
 120
 121 -       free_irq(NAS100D_RB_IRQ, NULL);
 122 +       del_timer_sync(&nas100d_power_timer);
 123 +
 124 +       free_irq(gpio_to_irq(NAS100D_RB_GPIO), NULL);
 125  }
 126
 127  module_init(nas100d_power_init);
 128 Index: linux-2.6.23.17/include/asm-arm/arch-ixp4xx/nas100d.h
 129 ===================================================================
 130 --- linux-2.6.23.17.orig/include/asm-arm/arch-ixp4xx/nas100d.h
 131 +++ linux-2.6.23.17/include/asm-arm/arch-ixp4xx/nas100d.h
 132 @@ -38,15 +38,15 @@
 133
 134  /* Buttons */
 135
 136 -#define NAS100D_PB_GPIO         14
 137 -#define NAS100D_RB_GPIO         4
 138 +#define NAS100D_PB_GPIO         14   /* power button */
 139 +#define NAS100D_RB_GPIO         4    /* reset button */
 140 +
 141 +/* Power control */
 142 +
 143  #define NAS100D_PO_GPIO         12   /* power off */
 144
 145 -#define NAS100D_PB_IRQ          IRQ_IXP4XX_GPIO14
 146 -#define NAS100D_RB_IRQ          IRQ_IXP4XX_GPIO4
 147 +/* LEDs */
 148
 149 -/*
 150 -#define NAS100D_PB_BM           (1L << NAS100D_PB_GPIO)
 151 -#define NAS100D_PO_BM           (1L << NAS100D_PO_GPIO)
 152 -#define NAS100D_RB_BM           (1L << NAS100D_RB_GPIO)
 153 -*/
 154 +#define NAS100D_LED_WLAN_GPIO  0
 155 +#define NAS100D_LED_DISK_GPIO  3
 156 +#define NAS100D_LED_PWR_GPIO   15
 157 Index: linux-2.6.23.17/arch/arm/mach-ixp4xx/nas100d-setup.c
 158 ===================================================================
 159 --- linux-2.6.23.17.orig/arch/arm/mach-ixp4xx/nas100d-setup.c
 160 +++ linux-2.6.23.17/arch/arm/mach-ixp4xx/nas100d-setup.c
 161 @@ -42,20 +42,20 @@ static struct platform_device nas100d_fl
 162  static struct resource nas100d_led_resources[] = {
 163         {
 164                 .name           = "wlan",   /* green led */
 165 -               .start          = 0,
 166 -               .end            = 0,
 167 +               .start          = NAS100D_LED_WLAN_GPIO,
 168 +               .end            = NAS100D_LED_WLAN_GPIO,
 169                 .flags          = IXP4XX_GPIO_LOW,
 170         },
 171         {
 172 -               .name           = "ready",  /* blue power led (off is flashing!) */
 173 -               .start          = 15,
 174 -               .end            = 15,
 175 +               .name           = "power",  /* blue power led (off is flashing!) */
 176 +               .start          = NAS100D_LED_PWR_GPIO,
 177 +               .end            = NAS100D_LED_PWR_GPIO,
 178                 .flags          = IXP4XX_GPIO_LOW,
 179         },
 180         {
 181                 .name           = "disk",   /* yellow led */
 182 -               .start          = 3,
 183 -               .end            = 3,
 184 +               .start          = NAS100D_LED_DISK_GPIO,
 185 +               .end            = NAS100D_LED_DISK_GPIO,
 186                 .flags          = IXP4XX_GPIO_LOW,
 187         },
 188  };