303 lines
8.5 KiB
C
303 lines
8.5 KiB
C
/****************************************************************************
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* drivers/i2c/pca9540bdp.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <fixedmath.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/i2c/i2c_master.h>
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#include "pca9540bdp.h"
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#include <nuttx/i2c/pca9540bdp.h>
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#ifdef CONFIG_I2CMULTIPLEXER_PCA9540BDP
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* I2C Helpers */
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static int pca9540bdp_write_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t regvalue);
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static int pca9540bdp_read_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t *regvalue);
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/* Other helpers */
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static int pca9540bdp_select_port(FAR struct pca9540bdp_dev_s *priv,
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uint8_t val);
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/* I2C multiplexer vtable */
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static int pca9540bdp_transfer_on_port (FAR struct i2c_master_s *dev,
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FAR struct i2c_msg_s *msgs, int count);
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#ifdef CONFIG_I2C_RESET
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static int pca9540bdp_reset_on_port (FAR struct i2c_master_s *dev);
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct i2c_ops_s g_i2cmux_ops =
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{
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pca9540bdp_transfer_on_port
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#ifdef CONFIG_I2C_RESET
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, pca9540bdp_reset_on_port
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int pca9540bdp_write_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t regvalue)
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{
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struct i2c_config_s iconf;
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int ret;
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iconf.frequency = CONFIG_PCA9549BDP_I2C_FREQUENCY;
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iconf.address = priv->addr;
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iconf.addrlen = 7;
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ret = i2c_write(priv->i2c, &iconf, ®value, 1);
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i2cinfo("Write to address 0x%02X; register value: 0x%02x ret: %d\n",
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priv->addr, regvalue, ret);
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return ret;
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}
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static int pca9540bdp_read_config(FAR struct pca9540bdp_dev_s *priv,
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FAR uint8_t *regvalue)
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{
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struct i2c_config_s iconf;
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int ret;
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iconf.frequency = CONFIG_PCA9549BDP_I2C_FREQUENCY;
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iconf.address = priv->addr;
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iconf.addrlen = 7;
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ret = i2c_read(priv->i2c, &iconf, regvalue, 1);
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i2cinfo("Read from address: 0x%02X; register value: 0x%02x ret: %d\n",
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priv->addr, *regvalue, ret);
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return ret;
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}
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static int pca9540bdp_select_port(FAR struct pca9540bdp_dev_s *priv,
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uint8_t val)
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{
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if (val != PCA9540BDP_SEL_PORT0 && val != PCA9540BDP_SEL_PORT1)
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{
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/* port not supported */
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return -EINVAL;
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}
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if ((PCA9540BDP_ENABLE | val) == priv->state)
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{
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/* port already selected */
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return OK;
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}
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/* Modify state and write it to the mux. Selecting a port always enables
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* the device
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*/
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priv->state = PCA9540BDP_ENABLE | val;
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return (pca9540bdp_write_config(priv, priv->state) == 0) ? OK : -ECOMM;
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}
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static int pca9540bdp_transfer_on_port(FAR struct i2c_master_s *dev,
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FAR struct i2c_msg_s *msgs, int count)
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{
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FAR struct i2c_port_dev_s *port_dev = (FAR struct i2c_port_dev_s *)dev;
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FAR struct pca9540bdp_dev_s *priv = port_dev->dev;
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int ret;
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/* select the mux port */
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if (pca9540bdp_select_port(priv, port_dev->port) != OK)
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{
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i2cerr("Could not select proper mux port\n");
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return -ECOMM; /* Signal error condition */
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}
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/* Resume the i2c transfer to the device connected to the mux port */
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ret = I2C_TRANSFER(priv->i2c, msgs, count);
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i2cinfo("Selected port %d and resumed transfer. Result: %d\n",
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port_dev->port, ret);
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return ret;
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}
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#ifdef CONFIG_I2C_RESET
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static int pca9540bdp_reset_on_port (FAR struct i2c_master_s *dev)
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{
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FAR struct i2c_port_dev_s *port_dev = (struct i2c_port_dev_s *)dev;
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FAR struct pca9540bdp_dev_s *priv = port_dev->dev;
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int port = port_dev->port;
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int ret;
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/* select the mux port */
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if (pca9540bdp_select_port(priv, port) != OK)
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{
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i2cerr("Could not select proper mux port\n");
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return -ECOMM; /* signal error condition */
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}
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/* resume the i2c reset for the device connected to the mux port */
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ret = I2C_RESET(priv->i2c);
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return ret;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pca9540bdp_lower_half
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*
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* Description:
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* Initialize the lower half of the PCA9540BDP by creating a i2c_master_s
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* for the virtual i2c master and link it to the associated PCA9540BDP and
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* its port.
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*
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* Input Parameters:
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* dev - Pointer to the associated PCA9540BDP
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* port - The port number as defined in pca9540bdp.h
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*
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* Returned Value:
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* Common i2c multiplexer device instance; NULL on failure.
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*
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****************************************************************************/
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FAR struct i2c_master_s *
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pca9540bdp_lower_half(FAR struct pca9540bdp_dev_s *dev, uint8_t port)
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{
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FAR struct i2c_port_dev_s *port_dev;
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/* Sanity check */
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DEBUGASSERT(dev != NULL);
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/* Initialize the i2c_port_dev_s device structure */
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port_dev = (FAR struct i2c_port_dev_s *)
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kmm_malloc(sizeof(struct i2c_port_dev_s));
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if (port_dev == NULL)
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{
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i2cerr("ERROR: Failed to allocate i2c port lower half instance\n");
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return NULL;
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}
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/* set vi2c ops to their implementations */
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port_dev->vi2c.ops = &g_i2cmux_ops;
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/* save state variables */
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port_dev->dev = dev;
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port_dev->port = port;
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return &port_dev->vi2c;
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}
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/****************************************************************************
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* Name: pca9540bdp_initialize
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*
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* Description:
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* Initialize the PCA9540BDP device.
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*
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* Input Parameters:
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* i2c - An instance of the I2C interface to use to communicate with
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* PCA9540BDP
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* addr - The I2C address of the PCA9540BDP. The base I2C address of the
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* PCA9540BDP is 0x70.
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*
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* Returned Value:
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* Common i2c multiplexer device instance; NULL on failure.
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*
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****************************************************************************/
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FAR struct pca9540bdp_dev_s *
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pca9540bdp_initialize(FAR struct i2c_master_s *i2c, uint8_t addr)
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{
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FAR struct pca9540bdp_dev_s *priv;
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/* Sanity check */
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DEBUGASSERT(i2c != NULL);
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/* Initialize the PCA9549BDP device structure */
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priv = (FAR struct pca9540bdp_dev_s *)
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kmm_malloc(sizeof(struct pca9540bdp_dev_s));
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if (priv == NULL)
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{
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i2cerr("ERROR: Failed to allocate instance\n");
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return NULL;
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}
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priv->i2c = i2c;
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priv->addr = addr;
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priv->state = 0x00;
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if (pca9540bdp_read_config(priv, &priv->state) != OK)
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{
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i2cerr("Could not read initial state from the device\n");
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kmm_free(priv);
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return NULL; /* signal error condition */
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}
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i2cinfo("Initial device state: %d\n", priv->state);
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if (pca9540bdp_select_port(priv, PCA9540BDP_SEL_PORT0) != OK)
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{
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i2cerr("Could not select mux port 0\n");
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kmm_free(priv);
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return NULL; /* signal error condition */
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}
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i2cinfo("PCA9549BDP (addr=0x%02x) set up with port %d\n", priv->addr,
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PCA9540BDP_SEL_PORT0);
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return priv;
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}
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#endif /* CONFIG_I2CMULTIPLEXER_PCA9540BDP */
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