From ffe0b23902ef8e92f60b7c15b53dfbb1f23fce8c Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Wed, 16 Nov 2005 13:27:07 +0000
Subject: Added single-byte read/write functions for the PCF50606 driver

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7905 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/pcf50606.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

(limited to 'firmware/drivers')

diff --git a/firmware/drivers/pcf50606.c b/firmware/drivers/pcf50606.c
index 993e56800d..a2045291ec 100644
--- a/firmware/drivers/pcf50606.c
+++ b/firmware/drivers/pcf50606.c
@@ -201,7 +201,7 @@ int pcf50606_i2c_write(int address, const unsigned char* buf, int count)
     return x;
 }
 
-int pcf50606_read(int address, unsigned char* buf, int count)
+int pcf50606_read_multiple(int address, unsigned char* buf, int count)
 {
     int i=0;
     int ret = 0;
@@ -232,7 +232,19 @@ int pcf50606_read(int address, unsigned char* buf, int count)
     return ret;
 }
 
-int pcf50606_write(int address, const unsigned char* buf, int count)
+int pcf50606_read(int address)
+{
+    int ret;
+    unsigned char c;
+
+    ret = pcf50606_read_multiple(address, &c, 1);
+    if(ret >= 0)
+        return c;
+    else
+        return ret;
+}
+
+int pcf50606_write_multiple(int address, const unsigned char* buf, int count)
 {
     unsigned char obuf[1];
     int i;
@@ -262,6 +274,12 @@ int pcf50606_write(int address, const unsigned char* buf, int count)
     return ret;
 }
 
+int pcf50606_write(int address, unsigned char val)
+{
+    return pcf50606_write_multiple(address, &val, 1);
+}
+
+
 /* These voltages were determined by measuring the output of the PCF50606
    on a running H300, and verified by disassembling the original firmware */
 static void set_voltages(void)
@@ -275,13 +293,11 @@ static void set_voltages(void)
             0xef,   /* LPREGC1 = 2.4V, ON in all states */
         };
     
-    pcf50606_write(0x23, buf, 5);
+    pcf50606_write_multiple(0x23, buf, 5);
 }
 
 void pcf50606_init(void)
 {
-    unsigned char c;
-    
     /* Bit banged I2C */
     or_l(0x00002000, &GPIO1_OUT);
     or_l(0x00001000, &GPIO_OUT);
@@ -293,6 +309,5 @@ void pcf50606_init(void)
     set_voltages();
 
     /* Backlight PWM = 512Hz 50/50 */
-    c = 0x13;
-    pcf50606_write(0x35, &c, 1);
+    pcf50606_write(0x35, 0x13);
 }
-- 
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