/**************************************************************************** * boards/arm/cxd56xx/drivers/sensors/bh1721fvc_scu.c * * Copyright 2018 Sony Semiconductor Solutions Corporation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name of Sony Semiconductor Solutions Corporation nor * the names of its contributors may be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_BH1721FVC_SCU) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define BH1721FVC_ADDR 0x23 /* I2C Slave Address */ #define BH1721FVC_BYTESPERSAMPLE 2 #define BH1721FVC_ELEMENTSIZE 0 /* BH1721FVC Opecode */ #define BH1721FVC_POWERDOWN 0x00 #define BH1721FVC_POWERON 0x01 #define BH1721FVC_AUTORESOLUTION 0x10 #ifndef itemsof # define itemsof(array) (sizeof(array)/sizeof(array[0])) #endif /**************************************************************************** * Private Type Definitions ****************************************************************************/ /** * @brief Structure for bh1721fvc device */ struct bh1721fvc_dev_s { FAR struct i2c_master_s *i2c; /* I2C interface */ uint8_t addr; /* I2C address */ int port; /* I2C port */ struct seq_s *seq; /* Sequencer instance */ int minor; /* Minor device number */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Character driver methods */ static int bh1721fvc_open(FAR struct file *filep); static int bh1721fvc_close(FAR struct file *filep); static ssize_t bh1721fvc_read(FAR struct file *filep, FAR char *buffer, size_t buflen); static ssize_t bh1721fvc_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); static int bh1721fvc_ioctl(FAR struct file *filep, int cmd, unsigned long arg); /**************************************************************************** * Private Data ****************************************************************************/ static const struct file_operations g_bh1721fvcfops = { bh1721fvc_open, /* open */ bh1721fvc_close, /* close */ bh1721fvc_read, /* read */ bh1721fvc_write, /* write */ 0, /* seek */ bh1721fvc_ioctl, /* ioctl */ #ifndef CONFIG_DISABLE_POLL 0, /* poll */ #endif 0 /* unlink */ }; /* Take ambient light data. */ static const uint16_t g_bh1721fvcinst[] = { SCU_INST_RECV(BH1721FVC_BYTESPERSAMPLE) | SCU_INST_LAST, }; /* Reference count */ static int g_refcnt = 0; /* Sequencer instance */ static struct seq_s *g_seq = NULL; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: bh1721fvc_writeopecode * * Description: * Write to BH1721FVC opecode * ****************************************************************************/ static void bh1721fvc_writeopecode(FAR struct bh1721fvc_dev_s *priv, uint8_t opecode) { uint16_t inst = SCU_INST_SEND(opecode) | SCU_INST_LAST; /* Send opecode */ scu_i2ctransfer(priv->port, priv->addr, &inst, 1, NULL, 0); } /**************************************************************************** * Name: bh1721fvc_seqinit * * Description: * Initialize SCU sequencer. * ****************************************************************************/ static int bh1721fvc_seqinit(FAR struct bh1721fvc_dev_s *priv) { DEBUGASSERT(g_seq == NULL); /* Open sequencer */ g_seq = seq_open(SEQ_TYPE_NORMAL, SCU_BUS_I2C0); if (!g_seq) { return -ENOENT; } priv->seq = g_seq; seq_setaddress(priv->seq, priv->addr); /* Set instruction and sample data information to sequencer */ seq_setinstruction(priv->seq, g_bh1721fvcinst, itemsof(g_bh1721fvcinst)); seq_setsample(priv->seq, BH1721FVC_BYTESPERSAMPLE, 0, BH1721FVC_ELEMENTSIZE, false); return OK; } /**************************************************************************** * Name: bh1721fvc_open * * Description: * This function is called whenever the BH1721FVC device is opened. * ****************************************************************************/ static int bh1721fvc_open(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct bh1721fvc_dev_s *priv = inode->i_private; if (g_refcnt == 0) { int ret; ret = bh1721fvc_seqinit(priv); if (ret < 0) { return ret; } bh1721fvc_writeopecode(priv, BH1721FVC_POWERON); bh1721fvc_writeopecode(priv, BH1721FVC_AUTORESOLUTION); } g_refcnt++; return OK; } /**************************************************************************** * Name: bh1721fvc_close * * Description: * This routine is called when the BH1721FVC device is closed. * ****************************************************************************/ static int bh1721fvc_close(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct bh1721fvc_dev_s *priv = inode->i_private; g_refcnt--; seq_ioctl(priv->seq, priv->minor, SCUIOC_STOP, 0); if (g_refcnt == 0) { bh1721fvc_writeopecode(priv, BH1721FVC_POWERDOWN); seq_close(g_seq); g_seq = NULL; } else { seq_ioctl(priv->seq, priv->minor, SCUIOC_FREEFIFO, 0); } return OK; } /**************************************************************************** * Name: bh1721fvc_read ****************************************************************************/ static ssize_t bh1721fvc_read(FAR struct file *filep, FAR char *buffer, size_t len) { FAR struct inode *inode = filep->f_inode; FAR struct bh1721fvc_dev_s *priv = inode->i_private; len = len / BH1721FVC_BYTESPERSAMPLE * BH1721FVC_BYTESPERSAMPLE; len = seq_read(priv->seq, priv->minor, buffer, len); return len; } /**************************************************************************** * Name: bh1721fvc_write ****************************************************************************/ static ssize_t bh1721fvc_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) { return -ENOSYS; } /**************************************************************************** * Name: bh1721fvc_ioctl ****************************************************************************/ static int bh1721fvc_ioctl(FAR struct file *filep, int cmd, unsigned long arg) { FAR struct inode *inode = filep->f_inode; FAR struct bh1721fvc_dev_s *priv = inode->i_private; int ret = OK; switch (cmd) { default: { if (_SCUIOCVALID(cmd)) { /* Redirect SCU commands */ ret = seq_ioctl(priv->seq, priv->minor, cmd, arg); } else { snerr("Unrecognized cmd: %d\n", cmd); ret = - ENOTTY; } } break; } return ret; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: bh1721fvc_init * * Description: * Initialize the BH1721FVC device * * Input Parameters: * i2c - An instance of the I2C interface to use to communicate with * BH1721FVC * port - I2C port (0 or 1) * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int bh1721fvc_init(FAR struct i2c_master_s *i2c, int port) { return OK; } /**************************************************************************** * Name: bh1721fvc_register * * Description: * Register the BH1721FVC ambient light sensor character device as * 'devpath' * * Input Parameters: * devpath - The full path to the driver to register. E.g., "/dev/light0" * minor - minor device number * i2c - An instance of the I2C interface to use to communicate with * BH1721FVC * port - I2C port (0 or 1) * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int bh1721fvc_register(FAR const char *devpath, int minor, FAR struct i2c_master_s *i2c, int port) { FAR struct bh1721fvc_dev_s *priv; char path[16]; int ret; /* Initialize the BH1721FVC device structure */ priv = (FAR struct bh1721fvc_dev_s *) kmm_malloc(sizeof(struct bh1721fvc_dev_s)); if (!priv) { snerr("Failed to allocate instance\n"); return -ENOMEM; } priv->i2c = i2c; priv->addr = BH1721FVC_ADDR; priv->port = port; priv->seq = NULL; priv->minor = minor; /* Register the character driver */ snprintf(path, sizeof(path), "%s%d", devpath, minor); ret = register_driver(path, &g_bh1721fvcfops, 0666, priv); if (ret < 0) { snerr("Failed to register driver: %d\n", ret); kmm_free(priv); } return ret; } #endif /* CONFIG_I2C && CONFIG_SENSORS_BH1721FVC_SCU */