From 267ac4b79b4533043731141115acf45e8018ba38 Mon Sep 17 00:00:00 2001
From: Michael Sevakis <jethead71@rockbox.org>
Date: Tue, 11 Jan 2011 23:48:29 +0000
Subject: [PATCH] SA9200: Adjust touchpad sensitivities so that actual contact
 with the player is needed to cause button presses and hopefully those
 settings will work nicely. Add a parameter read function to the MEP driver
 for debugging and RE purposes; enable compilation of it if you want to use
 it. Make a note in power-sa9200.c about button inits.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29032 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/synaptics-mep.c              | 33 +++++++++++++
 firmware/export/synaptics-mep.h               |  1 +
 .../target/arm/philips/sa9200/button-sa9200.c | 46 ++++++++++++++++++-
 .../target/arm/philips/sa9200/power-sa9200.c  |  2 +
 4 files changed, 80 insertions(+), 2 deletions(-)

diff --git a/firmware/drivers/synaptics-mep.c b/firmware/drivers/synaptics-mep.c
index f5b619053b..98c8829ead 100644
--- a/firmware/drivers/synaptics-mep.c
+++ b/firmware/drivers/synaptics-mep.c
@@ -608,6 +608,39 @@ int touchpad_set_parameter(char mod_nr, char par_nr, unsigned int param)
     return val;
 }
 
+#if 0
+/* Not used normally, but useful for pulling settings or determining
+   which parameters are supported */
+int touchpad_get_parameter(char mod_nr, char par_nr, unsigned int *param_p)
+{
+    char data[4];
+    int val = 0;
+
+    if (syn_status)
+    {
+        syn_enable_int(false);
+
+        /* 'Get MEP Parameter' command packet */
+        data[0]=0x01 | (mod_nr << 5); /* header - addr=mod_nr,global:0,ctrl:0,len:1 */
+        data[1]=0x40+par_nr; /* parameter number */
+        syn_send(data,2);
+
+        /* Must not be an error packet; check size */
+        if (syn_read(data,4) == 3)
+        {
+            /* ACK: param_hi[15:8], param_lo[7:0] */
+            if (param_p)
+                *param_p = ((unsigned int)data[2] << 8) | data[3];
+            val = 3;
+        }
+
+        syn_enable_int(true);
+    }
+
+    return val;
+}
+#endif
+
 int touchpad_set_buttonlights(unsigned int led_mask, char brightness)
 {
     char data[6];
diff --git a/firmware/export/synaptics-mep.h b/firmware/export/synaptics-mep.h
index 4eb57382a7..c3894d3e7c 100644
--- a/firmware/export/synaptics-mep.h
+++ b/firmware/export/synaptics-mep.h
@@ -25,5 +25,6 @@ int touchpad_init(void);
 int touchpad_read_device(char *data, int len);
 int touchpad_set_buttonlights(unsigned int led_mask, char brightness);
 int touchpad_set_parameter(char mod_nr, char par_nr, unsigned int param);
+int touchpad_get_parameter(char mod_nr, char par_nr, unsigned int *param_p);
 
 #endif
diff --git a/firmware/target/arm/philips/sa9200/button-sa9200.c b/firmware/target/arm/philips/sa9200/button-sa9200.c
index e3d569f422..1e92325c73 100644
--- a/firmware/target/arm/philips/sa9200/button-sa9200.c
+++ b/firmware/target/arm/philips/sa9200/button-sa9200.c
@@ -32,10 +32,52 @@ static int int_btn = BUTTON_NONE;
 #ifndef BOOTLOADER
 static bool hold_button_old = false;
 
+/* Capacitive buttons - lowest setting is still very sensitive */
+static const signed char button_sensitivity = -8; /* -8 to 7 */
+
+/* Strip - decent amount of contact needed */
+static const signed char strip_sensitivity = 0; /* -8 to 7 */
+static const unsigned char strip_pressure = 25; /* 0 to 255 */
+
 void button_init_device(void)
 {
     /* The touchpad is powered on and initialized in power-sa9200.c
        since it needs to be ready for both buttons and button lights. */
+
+    /* perform button-specific inits here */
+
+    /* Besides $00, only common parameters $20 and $21 are supported */
+
+    /* Report modes:
+     * [15:12] cap btn sens : xxxx,
+     * [11: 8] pos sen sens : xxxx,
+     * [ 7: 6] rate: 10 (40 rps),
+     * [    5] no filter: 0,
+     * [    4] reserved: 0,
+     * [    3] en scr: 0,
+     * [    2] en btns: 1,
+     * [    1] en rel: 0,
+     * [    0] en abs: 1 */
+    touchpad_set_parameter(0, 0x20,
+        ((button_sensitivity & 0xf) << 12) |
+        ((strip_sensitivity & 0xf) << 8) |
+        (0x2 << 6) |
+        (0x1 << 2) |
+        (0x1 << 0));
+
+    /* Enhanced operating configuration:
+     * [15: 9] reserved : 0000000
+     * [    8] Min abs reporting : 0
+     * [    7] reserved : 0
+     * [    6] not all cap btns : 1
+     * [    5] single cap btn : 0
+     * [    4] en 50ms debounce : 1
+     * [    3] motion reporting : 0
+     * [    2] clip z if no finger : 0
+     * [    1] disable decel : 0
+     * [    0] enable dribble : 0 */
+    touchpad_set_parameter(0, 0x21,
+        (0x1 << 6) | (0x1 << 4));
 }
 
 /*
@@ -43,7 +85,7 @@ void button_init_device(void)
  */
 void button_int(void)
 {
-    char data[4];
+    unsigned char data[4];
     int val;
 
     int_btn = BUTTON_NONE;
@@ -59,7 +101,7 @@ void button_int(void)
         if (data[1] & 0x8) int_btn |= BUTTON_LEFT;
         if (data[2] & 0x1) int_btn |= BUTTON_MENU;
     }
-    else if (val == MEP_ABSOLUTE_HEADER)
+    else if (val == MEP_ABSOLUTE_HEADER && data[3] >= strip_pressure)
     {
         /* Absolute packet - the finger is on the vertical strip.
            Position ranges from 1-4095, with 1 at the bottom. */
diff --git a/firmware/target/arm/philips/sa9200/power-sa9200.c b/firmware/target/arm/philips/sa9200/power-sa9200.c
index 1570954fcc..b6a3929e8b 100644
--- a/firmware/target/arm/philips/sa9200/power-sa9200.c
+++ b/firmware/target/arm/philips/sa9200/power-sa9200.c
@@ -66,6 +66,8 @@ void power_init(void)
     {
         logf("touchpad not ready");
     }
+
+    /* Setups specifically for buttons are handled in button-sa9200.c */
 #endif
 }