/**************************************************************************** * boards/arm/cxd56xx/drivers/sensors/bm1422gmv_scu.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_BM1422GMV_SCU) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #ifdef CONFIG_SENSORS_BM1422GMV_SCU_DECI # define BM1422GMV_SEQ_TYPE SEQ_TYPE_DECI #else # define BM1422GMV_SEQ_TYPE SEQ_TYPE_NORMAL #endif /* I2C Slave Address */ #ifdef CONFIG_BM1422GMV_SLAVE_ADDRESS_0F #define BM1422GMV_ADDR 0x0F #else #define BM1422GMV_ADDR 0x0E #endif #define BM1422GMV_DEVID 0x41 /* Device ID */ #define BM1422GMV_BYTESPERSAMPLE 6 #define BM1422GMV_ELEMENTSIZE 2 /* BM1422GMV Registers */ #define BM1422GMV_WIA 0x0F #define BM1422GMV_DATAX 0x10 #define BM1422GMV_CNTL1 0x1B #define BM1422GMV_CNTL2 0x1C #define BM1422GMV_CNTL3 0x1D #define BM1422GMV_CNTL4 0x5C /* Register CNTL1 */ #define BM1422GMV_CNTL1_PC1 (1 << 7) #define BM1422GMV_CNTL1_OUT_BIT (1 << 6) #define BM1422GMV_CNTL1_RST_LV (1 << 5) #define BM1422GMV_CNTL1_ODR_10Hz (0 << 3) #define BM1422GMV_CNTL1_ODR_20Hz (2 << 3) #define BM1422GMV_CNTL1_ODR_100Hz (1 << 3) #define BM1422GMV_CNTL1_ODR_1000Hz (3 << 3) #define BM1422GMV_CNTL1_FS1 (1 << 1) /* Register CNTL2 */ #define BM1422GMV_CNTL2_DREN (1 << 3) #define BM1422GMV_CNTL2_DRP (1 << 2) /* Register CNTL3 */ #define BM1422GMV_CNTL3_FORCE (1 << 6) /* Register CNTL4 */ #define BM1422GMV_CNTL4_VAL 0x0000 #ifndef itemsof # define itemsof(array) (sizeof(array)/sizeof(array[0])) #endif /**************************************************************************** * Private Type Definitions ****************************************************************************/ /* Structure for bm1422gmv device */ struct bm1422gmv_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 bm1422gmv_open(FAR struct file *filep); static int bm1422gmv_close(FAR struct file *filep); static ssize_t bm1422gmv_read(FAR struct file *filep, FAR char *buffer, size_t buflen); static ssize_t bm1422gmv_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); static int bm1422gmv_ioctl(FAR struct file *filep, int cmd, unsigned long arg); /**************************************************************************** * Private Data ****************************************************************************/ static const struct file_operations g_bm1422gmvfops = { bm1422gmv_open, /* open */ bm1422gmv_close, /* close */ bm1422gmv_read, /* read */ bm1422gmv_write, /* write */ 0, /* seek */ bm1422gmv_ioctl, /* ioctl */ #ifndef CONFIG_DISABLE_POLL 0, /* poll */ #endif 0 /* unlink */ }; /* Take XYZ data. */ static const uint16_t g_bm1422gmvinst[] = { SCU_INST_SEND(BM1422GMV_DATAX), SCU_INST_RECV(BM1422GMV_BYTESPERSAMPLE) | SCU_INST_LAST, }; /* Reference count */ static int g_refcnt = 0; /* Sequencer instance */ static struct seq_s *g_seq = NULL; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: bm1422gmv_getreg8 * * Description: * Read from an 8-bit BM1422GMV register * ****************************************************************************/ static uint8_t bm1422gmv_getreg8(FAR struct bm1422gmv_dev_s *priv, uint8_t regaddr) { uint8_t regval = 0; uint16_t inst[2]; /* Send register to read and get the next byte */ inst[0] = SCU_INST_SEND(regaddr); inst[1] = SCU_INST_RECV(1) | SCU_INST_LAST; scu_i2ctransfer(priv->port, priv->addr, inst, 2, ®val, 1); return regval; } /**************************************************************************** * Name: bm1422gmv_putreg8 * * Description: * Write to an 8-bit BM1422GMV register * ****************************************************************************/ static void bm1422gmv_putreg8(FAR struct bm1422gmv_dev_s *priv, uint8_t regaddr, uint8_t regval) { uint16_t inst[2]; /* Send register address and set the value */ inst[0] = SCU_INST_SEND(regaddr); inst[1] = SCU_INST_SEND(regval) | SCU_INST_LAST; scu_i2ctransfer(priv->port, priv->addr, inst, 2, NULL, 0); } /**************************************************************************** * Name: bm1422gmv_putreg16 * * Description: * Write to an 16-bit BM1422GMV register * ****************************************************************************/ static void bm1422gmv_putreg16(FAR struct bm1422gmv_dev_s *priv, uint8_t regaddr, uint16_t regval) { uint16_t inst[3]; /* Send register address and set the value */ inst[0] = SCU_INST_SEND(regaddr); inst[1] = SCU_INST_SEND((uint8_t)(regval & 0xff)); inst[2] = SCU_INST_SEND((uint8_t)(regval >> 8)) | SCU_INST_LAST; scu_i2ctransfer(priv->port, priv->addr, inst, 3, NULL, 0); } /**************************************************************************** * Name: bm1422gmv_checkid * * Description: * Read and verify the BM1422GMV chip ID * ****************************************************************************/ static int bm1422gmv_checkid(FAR struct bm1422gmv_dev_s *priv) { uint8_t devid; /* Read device ID */ devid = bm1422gmv_getreg8(priv, BM1422GMV_WIA); if (devid != BM1422GMV_DEVID) { /* ID is not Correct */ snerr("Wrong Device ID! %02x\n", devid); return -ENODEV; } return OK; } /**************************************************************************** * Name: bm1422gmv_seqinit * * Description: * Initialize SCU sequencer. * ****************************************************************************/ static int bm1422gmv_seqinit(FAR struct bm1422gmv_dev_s *priv) { DEBUGASSERT(g_seq == NULL); /* Open sequencer */ g_seq = seq_open(BM1422GMV_SEQ_TYPE, 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_bm1422gmvinst, itemsof(g_bm1422gmvinst)); seq_setsample(priv->seq, BM1422GMV_BYTESPERSAMPLE, 0, BM1422GMV_ELEMENTSIZE, false); return OK; } /**************************************************************************** * Name: bm1422gmv_open * * Description: * This function is called whenever the BM1422GMV device is opened. * ****************************************************************************/ static int bm1422gmv_open(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct bm1422gmv_dev_s *priv = inode->i_private; uint8_t val; if (g_refcnt == 0) { int ret; ret = bm1422gmv_seqinit(priv); if (ret < 0) { return ret; } /* goto active mode */ val = BM1422GMV_CNTL1_PC1 | BM1422GMV_CNTL1_OUT_BIT | BM1422GMV_CNTL1_ODR_100Hz; bm1422gmv_putreg8(priv, BM1422GMV_CNTL1, val); up_mdelay(1); /* release reset */ bm1422gmv_putreg16(priv, BM1422GMV_CNTL4, BM1422GMV_CNTL4_VAL); /* start sampling */ bm1422gmv_putreg8(priv, BM1422GMV_CNTL3, BM1422GMV_CNTL3_FORCE); } else { /* Set existing sequencer */ priv->seq = g_seq; } g_refcnt++; return OK; } /**************************************************************************** * Name: bm1422gmv_close * * Description: * This routine is called when the BM1422GMV device is closed. * ****************************************************************************/ static int bm1422gmv_close(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct bm1422gmv_dev_s *priv = inode->i_private; g_refcnt--; seq_ioctl(priv->seq, priv->minor, SCUIOC_STOP, 0); if (g_refcnt == 0) { /* goto power-down mode */ bm1422gmv_putreg8(priv, BM1422GMV_CNTL1, BM1422GMV_CNTL1_RST_LV); up_mdelay(1); seq_close(g_seq); g_seq = NULL; } else { seq_ioctl(priv->seq, priv->minor, SCUIOC_FREEFIFO, 0); } return OK; } /**************************************************************************** * Name: bm1422gmv_read ****************************************************************************/ static ssize_t bm1422gmv_read(FAR struct file *filep, FAR char *buffer, size_t len) { FAR struct inode *inode = filep->f_inode; FAR struct bm1422gmv_dev_s *priv = inode->i_private; len = len / BM1422GMV_BYTESPERSAMPLE * BM1422GMV_BYTESPERSAMPLE; len = seq_read(priv->seq, priv->minor, buffer, len); return len; } /**************************************************************************** * Name: bm1422gmv_write ****************************************************************************/ static ssize_t bm1422gmv_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) { return -ENOSYS; } /**************************************************************************** * Name: bm1422gmv_ioctl ****************************************************************************/ static int bm1422gmv_ioctl(FAR struct file *filep, int cmd, unsigned long arg) { FAR struct inode *inode = filep->f_inode; FAR struct bm1422gmv_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: bm1422gmv_init * * Description: * Initialize the BM1422GMV device * * Input Parameters: * i2c - An instance of the I2C interface to use to communicate with * BM1422GMV * port - I2C port (0 or 1) * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int bm1422gmv_init(FAR struct i2c_master_s *i2c, int port) { FAR struct bm1422gmv_dev_s tmp; FAR struct bm1422gmv_dev_s *priv = &tmp; int ret; /* Setup temporary device structure for initialization */ priv->i2c = i2c; priv->addr = BM1422GMV_ADDR; priv->port = port; /* Check Device ID */ ret = bm1422gmv_checkid(priv); if (ret < 0) { snerr("Failed to register driver: %d\n", ret); return ret; } return OK; } /**************************************************************************** * Name: bm1422gmv_register * * Description: * Register the BM1422GMV character device as 'devpath' * * Input Parameters: * devpath - The full path to the driver to register. E.g., "/dev/mag0" * minor - minor device number * i2c - An instance of the I2C interface to use to communicate with * BM1422GMV * port - I2C port (0 or 1) * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int bm1422gmv_register(FAR const char *devpath, int minor, FAR struct i2c_master_s *i2c, int port) { FAR struct bm1422gmv_dev_s *priv; char path[16]; int ret; /* Initialize the BM1422GMV device structure */ priv = (FAR struct bm1422gmv_dev_s *) kmm_malloc(sizeof(struct bm1422gmv_dev_s)); if (!priv) { snerr("Failed to allocate instance\n"); return -ENOMEM; } priv->i2c = i2c; priv->addr = BM1422GMV_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_bm1422gmvfops, 0666, priv); if (ret < 0) { snerr("Failed to register driver: %d\n", ret); kmm_free(priv); } sninfo("BM1422GMV driver loaded successfully!\n"); return ret; } #endif /* CONFIG_I2C && CONFIG_SENSORS_BM1422GMV_SCU */