905 lines
21 KiB
C
905 lines
21 KiB
C
/****************************************************************************
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* drivers/sensors/max44009.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 <sys/types.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 <poll.h>
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#include <stdio.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 <nuttx/kmalloc.h>
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#include <nuttx/mutex.h>
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#include <nuttx/random.h>
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#include <nuttx/sensors/max44009.h>
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/****************************************************************************
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* Pre-Processor Definitions
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****************************************************************************/
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#ifdef CONFIG_DEBUG_MAX44009
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# define max44009_dbg(x, ...) _info(x, ##__VA_ARGS__)
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#else
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# define max44009_dbg(x, ...) sninfo(x, ##__VA_ARGS__)
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#endif
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#ifndef CONFIG_MAX44009_I2C_FREQUENCY
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# define CONFIG_MAX44009_I2C_FREQUENCY 400000
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#endif
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/* Registers */
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#define MAX44009_INT_STS 0x0
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#define MAX44009_INT_EN 0x01
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#define MAX44009_CONFIG 0x02
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#define MAX44009_LUX_HBYTE 0x03
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#define MAX44009_LUX_LBYTE 0x04
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#define MAX44009_UP_THRESH_BYTE 0x05
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#define MAX44009_LOW_THRESH_BYTE 0x06
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#define MAX44009_THRESH_TIMER 0x07
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/* Other constants */
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#define MAX44009_I2C_RETRIES 10
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct max44009_dev_s
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{
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FAR struct max44009_config_s *config;
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mutex_t dev_lock;
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FAR struct i2c_master_s *i2c;
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uint8_t addr;
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uint8_t cref;
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bool int_pending;
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FAR struct pollfd *fds[CONFIG_MAX44009_NPOLLWAITERS];
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int max44009_open(FAR struct file *filep);
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static int max44009_close(FAR struct file *filep);
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static ssize_t max44009_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t max44009_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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static int max44009_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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static int max44009_poll(FAR struct file *filep, FAR struct pollfd *fds,
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bool setup);
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static int max44009_read_data(FAR struct max44009_dev_s *priv,
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FAR struct max44009_data_s *data);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_alsops =
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{
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max44009_open, /* open */
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max44009_close, /* close */
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max44009_read, /* read */
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max44009_write, /* write */
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NULL, /* seek */
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max44009_ioctl, /* ioctl */
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NULL, /* mmap */
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NULL, /* truncate */
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max44009_poll /* poll */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int max44009_do_transfer(FAR struct max44009_dev_s *dev,
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FAR struct i2c_msg_s *msgv,
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size_t nmsg)
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{
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int ret = -EIO;
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int retries;
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for (retries = 0; retries < MAX44009_I2C_RETRIES; retries++)
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{
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ret = I2C_TRANSFER(dev->i2c, msgv, nmsg);
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if (ret >= 0)
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{
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return 0;
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}
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else
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{
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#ifdef CONFIG_I2C_RESET
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/* Some error. Try to reset I2C bus and keep trying. */
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if (retries == MAX44009_I2C_RETRIES - 1)
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{
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break;
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}
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ret = I2C_RESET(dev->i2c);
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if (ret < 0)
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{
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max44009_dbg("I2C_RESET failed: %d\n", ret);
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return ret;
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}
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#endif
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}
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}
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max44009_dbg("xfer failed: %d\n", ret);
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return ret;
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}
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static int max44009_write_reg8(FAR struct max44009_dev_s *dev,
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FAR const uint8_t *command)
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{
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struct i2c_msg_s msgv[2] =
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{
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{
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.frequency = CONFIG_MAX44009_I2C_FREQUENCY,
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.addr = dev->addr,
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.flags = 0,
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.buffer = (FAR void *)&command[0],
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.length = 1
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},
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{
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.frequency = CONFIG_MAX44009_I2C_FREQUENCY,
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.addr = dev->addr,
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.flags = I2C_M_NOSTART,
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.buffer = (FAR void *)&command[1],
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.length = 1
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}
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};
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return max44009_do_transfer(dev, msgv, 2);
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}
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static int max44009_read_reg8(FAR struct max44009_dev_s *dev,
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FAR uint8_t *command,
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FAR uint8_t *value)
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{
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struct i2c_msg_s msgv[2] =
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{
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{
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.frequency = CONFIG_MAX44009_I2C_FREQUENCY,
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.addr = dev->addr,
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.flags = 0,
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.buffer = command,
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.length = 1
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},
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{
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.frequency = CONFIG_MAX44009_I2C_FREQUENCY,
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.addr = dev->addr,
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.flags = I2C_M_READ,
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.buffer = value,
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.length = 1
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}
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};
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return max44009_do_transfer(dev, msgv, 2);
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}
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static int max44009_open(FAR struct file *filep)
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{
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FAR struct inode *inode;
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FAR struct max44009_dev_s *priv;
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unsigned int use_count;
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int ret;
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inode = filep->f_inode;
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DEBUGASSERT(inode->i_private);
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priv = inode->i_private;
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ret = nxmutex_lock(&priv->dev_lock);
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if (ret < 0)
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{
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return ret;
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}
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use_count = priv->cref + 1;
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if (use_count == 1)
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{
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/* First user, do power on. */
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ret = priv->config->set_power(priv->config, true);
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if (ret < 0)
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{
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max44009_dbg("Cannot power on sensor: %d\n", ret);
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goto out_lock;
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}
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priv->config->irq_enable(priv->config, true);
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priv->cref = use_count;
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}
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else
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{
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DEBUGASSERT(use_count < UINT8_MAX && use_count > priv->cref);
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priv->cref = use_count;
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ret = 0;
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}
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max44009_dbg("Sensor is powered on\n");
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out_lock:
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nxmutex_unlock(&priv->dev_lock);
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return ret;
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}
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static int max44009_close(FAR struct file *filep)
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{
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FAR struct inode *inode;
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FAR struct max44009_dev_s *priv;
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int use_count;
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int ret;
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inode = filep->f_inode;
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DEBUGASSERT(inode->i_private);
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priv = inode->i_private;
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ret = nxmutex_lock(&priv->dev_lock);
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if (ret < 0)
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{
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return ret;
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}
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use_count = priv->cref - 1;
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if (use_count == 0)
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{
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priv->config->irq_enable(priv->config, false);
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/* Last user, do power off. */
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priv->config->set_power(priv->config, false);
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priv->cref = use_count;
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}
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else
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{
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DEBUGASSERT(use_count > 0);
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priv->cref = use_count;
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}
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max44009_dbg("CLOSED\n");
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nxmutex_unlock(&priv->dev_lock);
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return OK;
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}
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static ssize_t max44009_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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FAR struct inode *inode;
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FAR struct max44009_dev_s *priv;
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ssize_t length = 0;
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int ret;
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struct max44009_data_s data;
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inode = filep->f_inode;
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DEBUGASSERT(inode->i_private);
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priv = inode->i_private;
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ret = nxmutex_lock(&priv->dev_lock);
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if (ret < 0)
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{
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return (ssize_t)ret;
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}
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ret = max44009_read_data(priv, &data);
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if (ret < 0)
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{
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max44009_dbg("failed to read the sensor\n");
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}
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else
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{
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/* This interface is mainly intended for easy debugging in nsh. */
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length = snprintf(buffer, buflen, "%u.%03hu", data.lux, data.mlux);
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if (length > buflen)
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{
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length = buflen;
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}
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}
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nxmutex_unlock(&priv->dev_lock);
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return length;
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}
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static ssize_t max44009_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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ssize_t length = 0;
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return length;
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}
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static int max44009_set_interrupt_bit(FAR struct max44009_dev_s *priv,
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bool is_activated)
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{
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int ret;
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uint8_t cmd[2];
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cmd[0] = MAX44009_INT_EN;
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cmd[1] = is_activated ? (1 << 0) : 0;
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ret = max44009_write_reg8(priv, cmd);
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if (ret < 0)
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{
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max44009_dbg("Cannot set interrupt bit\n");
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}
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return ret;
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}
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static int max44009_set_manual_mode(FAR struct max44009_dev_s *priv,
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bool is_manual)
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{
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int ret;
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uint8_t value = 0;
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const uint8_t manual_bit = (1 << 6);
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uint8_t cmd[2];
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cmd[0] = MAX44009_CONFIG;
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ret = max44009_read_reg8(priv, &cmd[0], &value);
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if (ret < 0)
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{
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max44009_dbg("Cannot read config register\n");
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goto fail;
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}
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if (is_manual)
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{
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value |= manual_bit;
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}
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else
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{
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value &= ~manual_bit;
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}
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cmd[1] = value;
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ret = max44009_write_reg8(priv, cmd);
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if (ret < 0)
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{
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max44009_dbg("Cannot set manual bit in config register\n");
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}
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fail:
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return ret;
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}
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static int max44009_set_continuous_mode(FAR struct max44009_dev_s *priv,
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bool is_cont)
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{
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int ret;
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uint8_t value = 0;
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const uint8_t cont_bit = (1 << 7);
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uint8_t cmd[2];
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cmd[0] = MAX44009_CONFIG;
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ret = max44009_read_reg8(priv, &cmd[0], &value);
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if (ret < 0)
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{
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max44009_dbg("Cannot read config register\n");
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goto fail;
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}
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if (is_cont)
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{
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value |= cont_bit;
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}
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else
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{
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value &= ~cont_bit;
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}
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cmd[1] = value;
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ret = max44009_write_reg8(priv, cmd);
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if (ret < 0)
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{
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max44009_dbg("Cannot set cont bit in config register\n");
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}
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fail:
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return ret;
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}
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static int max44009_set_current_div_ratio(FAR struct max44009_dev_s *priv,
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bool is_cdr)
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{
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int ret;
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uint8_t value = 0;
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const uint8_t cdr_bit = (1 << 3);
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uint8_t cmd[2];
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cmd[0] = MAX44009_CONFIG;
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ret = max44009_read_reg8(priv, &cmd[0], &value);
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if (ret < 0)
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{
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max44009_dbg("Cannot read config register\n");
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goto fail;
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}
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if (is_cdr)
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{
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value |= cdr_bit;
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}
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else
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{
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value &= ~cdr_bit;
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}
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cmd[1] = value;
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ret = max44009_write_reg8(priv, cmd);
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if (ret < 0)
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{
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max44009_dbg("Cannot set cdr bit in config register\n");
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}
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fail:
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return ret;
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}
|
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|
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static int max44009_set_integration_time(FAR struct max44009_dev_s *priv,
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enum max44009_integration_time_e
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integration_time)
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{
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int ret;
|
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uint8_t value = 0;
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const uint8_t tim_bits = integration_time << 0;
|
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const uint8_t tim_mask = 0x07;
|
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uint8_t cmd[2];
|
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|
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cmd[0] = MAX44009_CONFIG;
|
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ret = max44009_read_reg8(priv, &cmd[0], &value);
|
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if (ret < 0)
|
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{
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max44009_dbg("Cannot read config register\n");
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goto fail;
|
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}
|
|
|
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value &= ~tim_mask;
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value |= tim_bits;
|
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|
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cmd[1] = value;
|
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ret = max44009_write_reg8(priv, cmd);
|
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if (ret < 0)
|
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{
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max44009_dbg("Cannot set tim bits in config register\n");
|
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}
|
|
|
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fail:
|
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return ret;
|
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}
|
|
|
|
static int max44009_set_threshold_timer(FAR struct max44009_dev_s *priv,
|
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uint8_t threshold_timer)
|
|
{
|
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int ret;
|
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uint8_t cmd[2];
|
|
|
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cmd[0] = MAX44009_THRESH_TIMER;
|
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cmd[1] = threshold_timer;
|
|
|
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ret = max44009_write_reg8(priv, cmd);
|
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if (ret < 0)
|
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{
|
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max44009_dbg("Threshold timer cannot be set\n");
|
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}
|
|
|
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return ret;
|
|
}
|
|
|
|
static int max44009_set_threshold(FAR struct max44009_dev_s *priv,
|
|
FAR struct max44009_threshold_s *settings)
|
|
{
|
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int ret;
|
|
uint8_t cmd[2];
|
|
|
|
cmd[0] = MAX44009_UP_THRESH_BYTE;
|
|
cmd[1] = settings->upper_threshold;
|
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ret = max44009_write_reg8(priv, cmd);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot set upper threshold\n");
|
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goto fail;
|
|
}
|
|
|
|
cmd[0] = MAX44009_LOW_THRESH_BYTE;
|
|
cmd[1] = settings->lower_threshold;
|
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ret = max44009_write_reg8(priv, cmd);
|
|
if (ret < 0)
|
|
{
|
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max44009_dbg("Cannot set lower threshold\n");
|
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goto fail;
|
|
}
|
|
|
|
ret = max44009_set_threshold_timer(priv, settings->threshold_timer);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot set threshold timer\n");
|
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goto fail;
|
|
}
|
|
|
|
ret = max44009_set_interrupt_bit(priv, true);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot set interrupt\n");
|
|
goto fail;
|
|
}
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int max44009_selftest(FAR struct max44009_dev_s *priv,
|
|
FAR struct max44009_data_s * data)
|
|
{
|
|
int ret;
|
|
uint8_t reg_addr = MAX44009_THRESH_TIMER;
|
|
uint8_t value = 0;
|
|
|
|
ret = max44009_set_threshold_timer(priv, data->test_value);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot write test-value\n");
|
|
goto fail;
|
|
}
|
|
|
|
ret = max44009_read_reg8(priv, ®_addr, &value);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot read written value\n");
|
|
goto fail;
|
|
}
|
|
|
|
if (value != data->test_value)
|
|
{
|
|
max44009_dbg("Test failed\n");
|
|
ret = -EIO;
|
|
}
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int max44009_init_device(FAR struct max44009_dev_s *priv,
|
|
FAR struct max44009_init_s * settings)
|
|
{
|
|
int ret;
|
|
|
|
ret = max44009_set_manual_mode(priv, settings->is_manual);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot init manual mode\n");
|
|
goto fail;
|
|
}
|
|
|
|
ret = max44009_set_continuous_mode(priv, settings->is_cont);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot init cont mode\n");
|
|
goto fail;
|
|
}
|
|
|
|
if (settings->is_manual)
|
|
{
|
|
ret = max44009_set_current_div_ratio(priv, settings->is_cdr);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot init cdr mode\n");
|
|
goto fail;
|
|
}
|
|
|
|
ret = max44009_set_integration_time(priv, settings->integr_time);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot init tim mode\n");
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
static int max44009_read_data(FAR struct max44009_dev_s *priv,
|
|
FAR struct max44009_data_s *data)
|
|
{
|
|
int ret;
|
|
uint8_t lvalue;
|
|
uint8_t hvalue;
|
|
uint8_t reg_addr;
|
|
uint32_t val;
|
|
|
|
reg_addr = MAX44009_INT_STS;
|
|
ret = max44009_read_reg8(priv, ®_addr, &hvalue);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot read interrupt status register\n");
|
|
}
|
|
|
|
reg_addr = MAX44009_LUX_HBYTE;
|
|
ret = max44009_read_reg8(priv, ®_addr, &hvalue);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot read high bits from lux register\n");
|
|
return ret;
|
|
}
|
|
|
|
/* LUX HBYTE has (starting with MSB): E3.E2.E1.E0.M7.M6.M5.M4
|
|
* LUX LBYTE has : --.--.--.--.M3.M2.M1.M0
|
|
*
|
|
* E[3..0] = Exponent, M[7..0]: Mantissa.
|
|
*
|
|
* Lux can be calculated as (full resolution):
|
|
* (M[7..0] << E[3..0]) * 0.045.
|
|
*
|
|
* Lux can also be calculated using only HBYTE:
|
|
* (M[7..4] << E[3..0]) * 0.72
|
|
* == (M[7..4] << E[3..0]) * 2^4 * 0.045
|
|
* == (M[7..4] << E[3..0]) * (1 << 4) * 0.045
|
|
* == (M[7..4] << (E[3..0] + 4)) * 0.045
|
|
*/
|
|
|
|
reg_addr = MAX44009_LUX_LBYTE;
|
|
ret = max44009_read_reg8(priv, ®_addr, &lvalue);
|
|
if (ret < 0)
|
|
{
|
|
max44009_dbg("Cannot read low bits from lux register\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Merge HBYTE and LBYTE to 16-bit integer:
|
|
* --.--.--.--.E3.E2.E1.E0.M7.M6.M5.M4.M3.M2.M1.M0
|
|
*/
|
|
|
|
data->raw_value = (hvalue << 4) | (lvalue & 0xf);
|
|
|
|
/* Add raw value to entropy pool. */
|
|
|
|
add_sensor_randomness(data->raw_value);
|
|
|
|
/* Convert raw value to lux and millilux. */
|
|
|
|
val = data->raw_value & 0xff;
|
|
val = val << ((data->raw_value & 0x0f00) >> 8);
|
|
|
|
/* lux is the raw output multiplied by 0.045. */
|
|
|
|
data->lux = (val * 45) / 1000;
|
|
data->mlux = (val * 45) % 1000;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max44009_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
|
|
{
|
|
FAR struct inode *inode;
|
|
FAR struct max44009_dev_s *priv;
|
|
int ret;
|
|
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode->i_private);
|
|
priv = inode->i_private;
|
|
|
|
ret = nxmutex_lock(&priv->dev_lock);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
switch (cmd)
|
|
{
|
|
case SNIOC_INIT:
|
|
ret = max44009_init_device(priv, (FAR struct max44009_init_s *)arg);
|
|
break;
|
|
|
|
case SNIOC_THRESHOLD:
|
|
ret = max44009_set_threshold(priv,
|
|
(FAR struct max44009_threshold_s *)arg);
|
|
break;
|
|
|
|
case SNIOC_READ_RAW_DATA:
|
|
case SNIOC_READ_CONVERT_DATA:
|
|
ret = max44009_read_data(priv, (FAR struct max44009_data_s *)arg);
|
|
break;
|
|
|
|
case SNIOC_START_SELFTEST:
|
|
ret = max44009_selftest(priv, (FAR struct max44009_data_s *)arg);
|
|
break;
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
nxmutex_unlock(&priv->dev_lock);
|
|
return ret;
|
|
}
|
|
|
|
static void max44009_notify(FAR struct max44009_dev_s *priv)
|
|
{
|
|
DEBUGASSERT(priv != NULL);
|
|
|
|
int i;
|
|
|
|
/* If there are threads waiting on poll() for data to become available,
|
|
* then wake them up now. NOTE: we wake up all waiting threads because we
|
|
* do not know that they are going to do. If they all try to read the
|
|
* data, then some make end up blocking after all.
|
|
*/
|
|
|
|
for (i = 0; i < CONFIG_MAX44009_NPOLLWAITERS; i++)
|
|
{
|
|
FAR struct pollfd *fds = priv->fds[i];
|
|
if (fds)
|
|
{
|
|
poll_notify(&fds, 1, POLLIN);
|
|
priv->int_pending = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int max44009_poll(FAR struct file *filep, FAR struct pollfd *fds,
|
|
bool setup)
|
|
{
|
|
FAR struct inode *inode;
|
|
FAR struct max44009_dev_s *priv;
|
|
int ret = OK;
|
|
int i;
|
|
|
|
DEBUGASSERT(fds);
|
|
inode = filep->f_inode;
|
|
|
|
DEBUGASSERT(inode->i_private);
|
|
priv = inode->i_private;
|
|
|
|
ret = nxmutex_lock(&priv->dev_lock);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
if (setup)
|
|
{
|
|
/* Ignore waits that do not include POLLIN */
|
|
|
|
if ((fds->events & POLLIN) == 0)
|
|
{
|
|
ret = -EDEADLK;
|
|
goto out;
|
|
}
|
|
|
|
/* This is a request to set up the poll. Find an available slot for
|
|
* the poll structure reference.
|
|
*/
|
|
|
|
for (i = 0; i < CONFIG_MAX44009_NPOLLWAITERS; i++)
|
|
{
|
|
/* Find an available slot */
|
|
|
|
if (!priv->fds[i])
|
|
{
|
|
/* Bind the poll structure and this slot */
|
|
|
|
priv->fds[i] = fds;
|
|
fds->priv = &priv->fds[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i >= CONFIG_MAX44009_NPOLLWAITERS)
|
|
{
|
|
fds->priv = NULL;
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (priv->int_pending)
|
|
{
|
|
poll_notify(&fds, 1, POLLIN);
|
|
priv->int_pending = false;
|
|
}
|
|
}
|
|
else if (fds->priv)
|
|
{
|
|
/* This is a request to tear down the poll. */
|
|
|
|
FAR struct pollfd **slot = (FAR struct pollfd **)fds->priv;
|
|
DEBUGASSERT(slot != NULL);
|
|
|
|
/* Remove all memory of the poll setup */
|
|
|
|
*slot = NULL;
|
|
fds->priv = NULL;
|
|
}
|
|
|
|
out:
|
|
nxmutex_unlock(&priv->dev_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int max44009_int_handler(int irq, FAR void *context, FAR void *arg)
|
|
{
|
|
FAR struct max44009_dev_s *priv = (FAR struct max44009_dev_s *)arg;
|
|
irqstate_t flags;
|
|
|
|
DEBUGASSERT(priv != NULL);
|
|
|
|
flags = enter_critical_section();
|
|
priv->int_pending = true;
|
|
leave_critical_section(flags);
|
|
max44009_notify(priv);
|
|
max44009_dbg("MAX44009 interrupt\n");
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
int max44009_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
|
|
uint8_t addr, FAR struct max44009_config_s *config)
|
|
{
|
|
struct max44009_dev_s *priv;
|
|
int ret;
|
|
|
|
priv = kmm_zalloc(sizeof(struct max44009_dev_s));
|
|
if (!priv)
|
|
{
|
|
max44009_dbg("Memory cannot be allocated for ALS sensor\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
priv->addr = addr;
|
|
priv->i2c = i2c;
|
|
priv->config = config;
|
|
nxmutex_init(&priv->dev_lock);
|
|
|
|
ret = register_driver(devpath, &g_alsops, 0666, priv);
|
|
max44009_dbg("Registered with %d\n", ret);
|
|
if (ret < 0)
|
|
{
|
|
nxmutex_destroy(&priv->dev_lock);
|
|
kmm_free(priv);
|
|
max44009_dbg("Error occurred during the driver registering\n");
|
|
return ret;
|
|
}
|
|
|
|
priv->config->irq_attach(priv->config, max44009_int_handler, priv);
|
|
priv->config->irq_enable(priv->config, false);
|
|
return ret;
|
|
}
|