From 285079138b0baa5cf03221f8abcdaaec8e35f112 Mon Sep 17 00:00:00 2001
From: Dave Chapman <dave@dchapman.com>
Date: Mon, 27 Feb 2006 12:35:05 +0000
Subject: [PATCH] Patch #3060 from Andrew Scott - iPod mini button driver

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8857 a1c6a512-1295-4272-9138-f99709370657
---
 bootloader/ipod.c             |  4 ++
 firmware/drivers/button.c     | 89 ++++++++++++++++++++++++++++++++++-
 firmware/drivers/i2c-pp5020.c |  8 ++++
 firmware/export/config.h      |  2 +-
 firmware/system.c             | 13 +++++
 5 files changed, 113 insertions(+), 3 deletions(-)

diff --git a/bootloader/ipod.c b/bootloader/ipod.c
index f62fa265a5..793253a0ca 100644
--- a/bootloader/ipod.c
+++ b/bootloader/ipod.c
@@ -193,7 +193,11 @@ static int key_pressed(void)
     unsigned char state;
 
 #if CONFIG_KEYPAD == IPOD_4G_PAD
+#if defined(APPLE_IPODMINI)
+    state = GPIOA_INPUT_VAL & 0x3f;
+#else
     state = opto_keypad_read();
+#endif
     if ((state & 0x4) == 0) return BUTTON_LEFT;
     if ((state & 0x10) == 0) return BUTTON_MENU;
     if ((state & 0x8) == 0) return BUTTON_PLAY;
diff --git a/firmware/drivers/button.c b/firmware/drivers/button.c
index d5855506fc..0b41fb10fe 100644
--- a/firmware/drivers/button.c
+++ b/firmware/drivers/button.c
@@ -87,7 +87,9 @@ static bool remote_button_hold_only(void);
 #if CONFIG_KEYPAD == IPOD_4G_PAD
 /* Variable to use for setting button status in interrupt handler */
 int int_btn = BUTTON_NONE;
+#endif
 
+#if (CONFIG_KEYPAD == IPOD_4G_PAD) && (!defined(APPLE_IPODMINI))
 static void opto_i2c_init(void)
 {
     int i, curr_value;
@@ -240,7 +242,7 @@ void ipod_4g_button_int(void)
     CPU_HI_INT_EN = I2C_MASK;
 }
 #endif 
-#if CONFIG_KEYPAD == IPOD_3G_PAD
+#if (CONFIG_KEYPAD == IPOD_3G_PAD) || (defined(APPLE_IPODMINI))
 /**
  * 
  * 
@@ -291,7 +293,68 @@ void handle_scroll_wheel(int new_scroll, int was_hold, int reverse)
               queue_post(&button_queue, wheel_keycode, NULL);
     prev_scroll = new_scroll;
 }
+#endif
+#if (CONFIG_KEYPAD == IPOD_4G_PAD) && (defined(APPLE_IPODMINI))
+static int ipod_mini_button_read(void)
+{
+     unsigned char source, wheel_source, state, wheel_state;
+     int btn = BUTTON_NONE;
 
+    /*
+     * we need some delay for mini, cause hold generates several interrupts,
+     * some of them delayed
+     */
+    udelay(250);
+
+    /* get source(s) of interupt */
+    source = GPIOA_INT_STAT & 0x3f;
+    wheel_source = GPIOB_INT_STAT & 0x30;
+
+    if (source == 0 && wheel_source == 0) {
+        return BUTTON_NONE; /* not for us */
+    }
+
+    /* get current keypad & wheel status */
+    state = GPIOA_INPUT_VAL & 0x3f;
+    wheel_state = GPIOB_INPUT_VAL & 0x30;
+
+    /* toggle interrupt level */
+    GPIOA_INT_LEV = ~state;
+    GPIOB_INT_LEV = ~wheel_state;
+
+    if (source & 0x1)
+        btn |= BUTTON_SELECT;
+    if (source & 0x2)
+        btn |= BUTTON_MENU;
+    if (source & 0x4)
+        btn |= BUTTON_PLAY;
+    if (source & 0x8)
+        btn |= BUTTON_RIGHT;
+    if (source & 0x10)
+        btn |= BUTTON_LEFT;
+
+    if (wheel_source & 0x30) {
+        handle_scroll_wheel((wheel_state & 0x30) >> 4, 0, 1);
+    }
+
+    /* ack any active interrupts */
+    if (source)
+        GPIOA_INT_CLR = source;
+    if (wheel_source)
+        GPIOB_INT_CLR = wheel_source;
+
+    return btn;
+}
+
+void ipod_mini_button_int(void)
+{
+    CPU_HI_INT_CLR = GPIO_MASK;
+    int_btn = ipod_mini_button_read();
+    //CPU_INT_EN = 0x40000000;
+    CPU_HI_INT_EN = GPIO_MASK;
+}
+#endif
+#if CONFIG_KEYPAD == IPOD_3G_PAD
 static int ipod_3g_button_read(void)
 {
      unsigned char source, state;
@@ -541,7 +604,7 @@ void button_init(void)
     /* nothing to initialize here */
 #elif CONFIG_KEYPAD == GMINI100_PAD
     /* nothing to initialize here */
-#elif CONFIG_KEYPAD == IPOD_4G_PAD
+#elif (CONFIG_KEYPAD == IPOD_4G_PAD) && (!defined(APPLE_IPODMINI))
     opto_i2c_init();
     /* hold button - enable as input */
     GPIOA_ENABLE |= 0x20;
@@ -551,9 +614,31 @@ void button_init(void)
     GPIOA_INT_CLR = GPIOA_INT_STAT & 0x20;
     /* enable interrupts */
     GPIOA_INT_EN = 0x20;
+    /* unmask interrupt */
     CPU_INT_EN = 0x40000000;
     CPU_HI_INT_EN = I2C_MASK;
 
+#elif (CONFIG_KEYPAD == IPOD_4G_PAD) && (defined(APPLE_IPODMINI))
+    /* iPod Mini G1 */
+    /* buttons - enable as input */
+    GPIOA_ENABLE |= 0x3f;
+    GPIOA_OUTPUT_EN &= ~0x3f;
+    /* scroll wheel- enable as input */
+    GPIOB_ENABLE |= 0x30; /* port b 4,5 */
+    GPIOB_OUTPUT_EN &= ~0x30; /* port b 4,5 */
+    /* buttons - set interrupt levels */
+    GPIOA_INT_LEV = ~(GPIOA_INPUT_VAL & 0x3f);
+    GPIOA_INT_CLR = GPIOA_INT_STAT & 0x3f;
+    /* scroll wheel - set interrupt levels */
+    GPIOB_INT_LEV = ~(GPIOB_INPUT_VAL & 0x3f);
+    GPIOB_INT_CLR = GPIOB_INT_STAT & 0x3f;
+    /* enable interrupts */
+    GPIOA_INT_EN = 0x3f;
+    GPIOB_INT_EN = 0x30;
+    /* unmask interrupt */
+    CPU_INT_EN = 0x40000000;
+    CPU_HI_INT_EN = GPIO_MASK;
+
 #elif CONFIG_KEYPAD == IPOD_3G_PAD
     GPIOA_INT_LEV = ~GPIOA_INPUT_VAL;
     GPIOA_INT_CLR = GPIOA_INT_STAT;
diff --git a/firmware/drivers/i2c-pp5020.c b/firmware/drivers/i2c-pp5020.c
index fccaffc571..9f26d3be6e 100644
--- a/firmware/drivers/i2c-pp5020.c
+++ b/firmware/drivers/i2c-pp5020.c
@@ -161,6 +161,14 @@ void i2c_init(void)
 {
    /* From ipodlinux */
 
+#if defined(APPLE_IPODMINI)
+   /* GPIO port C disable port 0x10 */
+   GPIOC_ENABLE &= ~0x10;
+
+   /* GPIO port C disable port 0x20 */
+   GPIOC_ENABLE &= ~0x20;
+#endif
+
    outl(inl(0x6000600c) | 0x1000, 0x6000600c);     /* enable 12 */
    outl(inl(0x60006004) | 0x1000, 0x60006004);     /* start reset 12 */
    outl(inl(0x60006004) & ~0x1000, 0x60006004);    /* end reset 12 */
diff --git a/firmware/export/config.h b/firmware/export/config.h
index 1557accde5..20ca7aa5c6 100644
--- a/firmware/export/config.h
+++ b/firmware/export/config.h
@@ -123,7 +123,7 @@
 
 /* CONFIG_RTC */
 #define RTC_M41ST84W 1 /* Archos Recorder */
-#define RTC_PCF50605 2 /* iPod 3G and 4G*/
+#define RTC_PCF50605 2 /* iPod 3G, 4G & Mini */
 #define RTC_PCF50606 3 /* iriver H300 */
 #define RTC_S3C2440  4
 
diff --git a/firmware/system.c b/firmware/system.c
index 79004f8284..fa07f6364e 100644
--- a/firmware/system.c
+++ b/firmware/system.c
@@ -1140,6 +1140,18 @@ unsigned int ipod_hw_rev;
 
 #ifndef BOOTLOADER
 extern void TIMER1(void);
+
+#if defined(APPLE_IPODMINI)
+extern void ipod_mini_button_int(void);
+
+void irq(void)
+{
+    if (CPU_INT_STAT & TIMER1_MASK)
+        TIMER1();
+    else if (CPU_HI_INT_STAT & GPIO_MASK)
+        ipod_mini_button_int();        
+}
+#else
 extern void ipod_4g_button_int(void);
 
 void irq(void)
@@ -1150,6 +1162,7 @@ void irq(void)
         ipod_4g_button_int();
 }
 #endif
+#endif /* BOOTLOADER */
 
 /* TODO: The following two function have been lifted straight from IPL, and
    hence have a lot of numeric addresses used straight. I'd like to use