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iPod 1st Gen: Dynamic wheel enable. This reduces wheel power consumption to about 0.5% when hold is not enabled and there is no activity, and keeps it disabled on hold.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14386 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2007-08-18 09:47:19 +00:00
parent 9110344fbd
commit 7c37c54ce5
1 changed files with 36 additions and 13 deletions
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49
firmware/target/arm/ipod/button-1g-3g.c
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@ -41,7 +41,14 @@
#include "powermgmt.h"
#include "hwcompat.h"
int int_btn = BUTTON_NONE;
static int int_btn = BUTTON_NONE;
#ifdef IPOD_1G2G
/* The 1st Gen wheel draws ~12mA when enabled permanently. Therefore
* we only enable it for a very short time to check for changes every
* tick, and only keep it enabled if there is activity. */
#define WHEEL_TIMEOUT (HZ/4)
static int wheel_timeout = 0;
#endif
/* iPod 3G and mini 1G, mini 2G uses iPod 4G code */
void handle_scroll_wheel(int new_scroll, int was_hold, int reverse)
@ -56,6 +63,10 @@ void handle_scroll_wheel(int new_scroll, int was_hold, int reverse)
{1, 0, 0, -1},
{0, -1, 1, 0}
};
#ifdef IPOD_1G2G
wheel_timeout = WHEEL_TIMEOUT;
#endif
if ( prev_scroll == -1 ) {
prev_scroll = new_scroll;
@ -207,25 +218,37 @@ int button_read_device(void)
{
static bool hold_button = false;
bool hold_button_old;
#ifdef IPOD_1G2G
static unsigned char last_wheel_value = 0;
unsigned char wheel_value;
if ((IPOD_HW_REVISION >> 16) == 1)
{
if (!hold_button && (wheel_timeout == 0))
{
GPIOB_OUTPUT_VAL |= 0x01; /* enable wheel */
udelay(50); /* let the voltage settle */
wheel_value = GPIOA_INPUT_VAL >> 6;
if (wheel_value != last_wheel_value)
{
last_wheel_value = wheel_value;
wheel_timeout = WHEEL_TIMEOUT; /* keep wheel enabled */
}
}
if (wheel_timeout)
wheel_timeout--;
else
GPIOB_OUTPUT_VAL &= ~0x01; /* disable wheel */
}
#endif
/* normal buttons */
hold_button_old = hold_button;
hold_button = button_hold();
if (hold_button != hold_button_old)
{
backlight_hold_changed(hold_button);
#ifdef IPOD_1G2G
/* Disable the 1st gen's wheel on hold in order to save power.
* The wheel draws ~12mA when enabled! Toggling the bit doesn't hurt
* on 2nd gen, because the pin is set to input (headphone detect). */
if (hold_button)
GPIOB_OUTPUT_VAL &= ~0x01; /* disable wheel */
else
GPIOB_OUTPUT_VAL |= 0x01; /* enable wheel */
#endif
}
return int_btn;
}