Sansa Clip: implement the fmradio_i2c interface using generic_i2c

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19366 a1c6a512-1295-4272-9138-f99709370657

firmware/export/fmradio_i2c.h

@@ -22,6 +22,7 @@
 #ifndef FMRADIO_I2C_H
 #define FMRADIO_I2C_H
 
+void fmradio_i2c_init(void);
 int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count);
 int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count);
 

firmware/target/arm/as3525/sansa-clip/fmradio-i2c-clip.c

@@ -0,0 +1,137 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Bertrik Sikken
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+/*
+    This is the fmradio_i2c interface, used by the radio driver
+    to communicate with the radio tuner chip.
+    
+    It is implemented using the generic i2c driver, which does "bit-banged"
+    I2C with a couple of GPIO pins.
+ */
+
+#include "as3525.h"
+#include "generic_i2c.h"
+#include "fmradio_i2c.h"
+
+#define I2C_SCL_PIN 4
+#define I2C_SDA_PIN 5
+
+static void fm_scl_hi(void)
+{
+    GPIOB_PIN(I2C_SCL_PIN) = 1 << I2C_SCL_PIN;
+}
+
+static void fm_scl_lo(void)
+{
+    GPIOB_PIN(I2C_SCL_PIN) = 0;
+}
+
+static void fm_sda_hi(void)
+{
+    GPIOB_PIN(I2C_SDA_PIN) = 1 << I2C_SDA_PIN;
+}
+
+static void fm_sda_lo(void)
+{
+    GPIOB_PIN(I2C_SDA_PIN) = 0;
+}
+
+static void fm_sda_input(void)
+{
+    GPIOB_DIR &= ~(1 << I2C_SDA_PIN);
+}
+
+static void fm_sda_output(void)
+{
+    GPIOB_DIR |= 1 << I2C_SDA_PIN;
+}
+
+static void fm_scl_input(void)
+{
+    GPIOB_DIR &= ~(1 << I2C_SCL_PIN);
+}
+
+static void fm_scl_output(void)
+{
+    GPIOB_DIR |= 1 << I2C_SCL_PIN;
+}
+
+static int fm_sda(void)
+{
+    return GPIOB_PIN(I2C_SDA_PIN);
+}
+
+static int fm_scl(void)
+{
+    return GPIOB_PIN(I2C_SCL_PIN);
+}
+
+/* simple and crude delay, used for all delays in the generic i2c driver */
+static void fm_delay(void)
+{
+    volatile int i;
+    
+    /* this loop is uncalibrated and could use more sophistication */
+    for (i = 0; i < 100; i++) {
+    }
+}
+
+/* interface towards the generic i2c driver */
+static struct i2c_interface fm_i2c_interface = {
+    .address = 0x10 << 1,
+    
+    .scl_hi = fm_scl_hi,
+    .scl_lo = fm_scl_lo,
+    .sda_hi = fm_sda_hi,
+    .sda_lo = fm_sda_lo,
+    .sda_input = fm_sda_input,
+    .sda_output = fm_sda_output,
+    .scl_input = fm_scl_input,
+    .scl_output = fm_scl_output,
+    .scl = fm_scl,
+    .sda = fm_sda,
+    
+    .delay_hd_sta = fm_delay,
+    .delay_hd_dat = fm_delay,
+    .delay_su_dat = fm_delay,
+    .delay_su_sto = fm_delay,
+    .delay_su_sta = fm_delay,
+    .delay_thigh = fm_delay
+};
+
+/* initialise i2c for fmradio */
+void fmradio_i2c_init(void)
+{
+    i2c_add_node(&fm_i2c_interface);
+}
+
+int fmradio_i2c_write(unsigned char address, const unsigned char* buf, int count)
+{
+    return i2c_write_data(address, -1, buf, count);
+}
+
+int fmradio_i2c_read(unsigned char address, unsigned char* buf, int count)
+{
+    return i2c_read_data(address, -1, buf, count);
+}
+
+
+