/**************************************************************************** * drivers/leds/ncp5623c.c * based on drivers/leds/pca9635pw.c * * Author: Konstantin Berzenko * * 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 NuttX 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 #if defined(CONFIG_I2C) && defined(CONFIG_NCP5623C) /**************************************************************************** * Private Type Definitions ****************************************************************************/ struct ncp5623c_dev_s { FAR struct i2c_master_s *i2c; uint8_t i2c_addr; }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int ncp5623c_i2c_write_byte(FAR struct ncp5623c_dev_s *priv, uint8_t const reg_addr, uint8_t const reg_val); static int ncp5623c_open(FAR struct file *filep); static int ncp5623c_close(FAR struct file *filep); static int ncp5623c_ioctl(FAR struct file *filep, int cmd, unsigned long arg); static ssize_t ncp5623c_read(FAR struct file *filep, FAR char *buffer, size_t buflen); static ssize_t ncp5623c_write(FAR struct file *filep, FAR const char *buffer, size_t buflen); /**************************************************************************** * Private Data ****************************************************************************/ static const struct file_operations g_ncp5623c_fileops = { ncp5623c_open, /* open */ ncp5623c_close, /* close */ ncp5623c_read, /* read */ ncp5623c_write, /* write */ 0, /* seek */ ncp5623c_ioctl, /* ioctl */ 0 /* poll */ }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: ncp5623c_i2c_write_byte * * Description: * Write a single byte to one of the NCP5623C configuration registers. * ****************************************************************************/ static int ncp5623c_i2c_write_byte(FAR struct ncp5623c_dev_s *priv, uint8_t const reg_addr, uint8_t const reg_val) { struct i2c_config_s config; int ret = OK; /* Assemble the 1 byte message comprised of reg_val */ uint8_t const BUFFER_SIZE = 1; uint8_t buffer[BUFFER_SIZE]; buffer[0] = NCP5623C_SET_REG(reg_addr, reg_val); /* Setup up the I2C configuration */ config.frequency = I2C_BUS_FREQ_HZ; config.address = priv->i2c_addr; config.addrlen = 7; /* Write the data (no RESTART) */ lcdinfo("i2c addr: 0x%02X value: 0x%02X\n", priv->i2c_addr, buffer[0]); ret = i2c_write(priv->i2c, &config, buffer, BUFFER_SIZE); if (ret != OK) { lcderr("ERROR: i2c_write returned error code %d\n", ret); return ret; } return OK; } /**************************************************************************** * Name: ncp5623c_open * * Description: * This function is called whenever a NCP5623C device is opened. * ****************************************************************************/ static int ncp5623c_open(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct ncp5623c_dev_s *priv = inode->i_private; int ret = -1; /* Shutdown the NCP5623C */ ret = ncp5623c_i2c_write_byte(priv, NCP5623C_SHUTDOWN, 0x00); if (ret != OK) { lcderr("ERROR: Could not shut down the NCP5623C\n"); return ret; } /* Set up Max current */ ret = ncp5623c_i2c_write_byte(priv, NCP5623C_ILED, 0x1f); if (ret != OK) { lcderr("ERROR: Could not set up max current\n"); return ret; } /* Let the chip settle a bit */ nxsig_usleep(1); return OK; } /**************************************************************************** * Name: ncp5623c_close * * Description: * This function is called whenever a NCP5623C device is closed. * ****************************************************************************/ static int ncp5623c_close(FAR struct file *filep) { FAR struct inode *inode = filep->f_inode; FAR struct ncp5623c_dev_s *priv = inode->i_private; int ret = -1; /* Shut down NCP5623C */ ret = ncp5623c_i2c_write_byte(priv, NCP5623C_SHUTDOWN, 0x00); if (ret != OK) { return ret; } return OK; } /**************************************************************************** * Name: ncp5623c_ioctl * * Description: * This function is called whenever an ioctl call to a NCP5623C is * performed. * ****************************************************************************/ static int ncp5623c_ioctl(FAR struct file *filep, int cmd, unsigned long arg) { FAR struct inode *inode = filep->f_inode; FAR struct ncp5623c_dev_s *priv = inode->i_private; int ret = OK; lcdinfo("cmd: %d arg: %ld\n", cmd, arg); switch (cmd) { case LEDIOC_SET_REG: { /* Retrieve the information handed over as argument for this ioctl */ FAR const struct ncp5623c_set_reg_s *ptr = (FAR const struct ncp5623c_set_reg_s *)((uintptr_t)arg); DEBUGASSERT(ptr != NULL); if (ptr->reg > NCP5623C_MAX_REG) { lcderr("ERROR: Unrecognized register: %d\n", ptr->reg); ret = -EFAULT; break; } ret = ncp5623c_i2c_write_byte(priv, ptr->reg, ptr->val); } break; /* The used ioctl command was invalid */ default: { lcderr("ERROR: Unrecognized cmd: %d\n", cmd); ret = -ENOTTY; } break; } return ret; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: ncp5623c_register * * Description: * Register the NCP5623C device as 'devpath' * * Input Parameters: * devpath - The full path to the driver to register. E.g., "/dev/rgbdrv0". * i2c - An instance of the I2C interface to use to communicate * with the LED driver. * ncp5623c_i2c_addr * - The I2C address of the NCP5623C. * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int ncp5623c_register(FAR const char *devpath, FAR struct i2c_master_s *i2c, uint8_t const ncp5623c_i2c_addr) { /* Sanity check */ DEBUGASSERT(i2c != NULL); /* Initialize the NCP5623C device structure */ FAR struct ncp5623c_dev_s *priv = (FAR struct ncp5623c_dev_s *)kmm_malloc(sizeof(struct ncp5623c_dev_s)); if (priv == NULL) { lcderr("ERROR: Failed to allocate instance of ncp5623c_dev_s\n"); return -ENOMEM; } priv->i2c = i2c; priv->i2c_addr = ncp5623c_i2c_addr; /* Register the character driver */ int const ret = register_driver(devpath, &g_ncp5623c_fileops, 0666, priv); if (ret != OK) { lcderr("ERROR: Failed to register driver: %d\n", ret); kmm_free(priv); return ret; } return OK; } /**************************************************************************** * Name: ncp5623c_read * * Description: * A dummy read method. This is provided only to satisfy the VFS layer. * ****************************************************************************/ static ssize_t ncp5623c_read(FAR struct file *filep, FAR char *buffer, size_t buflen) { /* Return zero -- usually meaning end-of-file */ return 0; } /**************************************************************************** * Name: ncp5623c_write * * Description: * A dummy write method. This is provided only to satisfy the VFS layer. * ****************************************************************************/ static ssize_t ncp5623c_write(FAR struct file *filep, FAR const char *buffer, size_t buflen) { FAR struct inode *inode = filep->f_inode; FAR struct ncp5623c_dev_s *priv = inode->i_private; int ret = OK; unsigned int red; unsigned int green; unsigned int blue; char color[3]; lcdinfo("%s\n", buffer); /* We need to receive a string #RRGGBB = 7 bytes */ if (buffer == NULL || buflen < 7) { /* Well... nothing to do */ return -EINVAL; } /* Check if it is a color format */ if (buffer[0] != '#') { /* The color code needs to start with # */ return -EINVAL; } /* Move buffer to next character */ buffer++; color[0] = buffer[0]; color[1] = buffer[1]; color[2] = '\0'; red = strtol(color, NULL, 16); color[0] = buffer[2]; color[1] = buffer[3]; color[2] = '\0'; green = strtol(color, NULL, 16); color[0] = buffer[4]; color[1] = buffer[5]; color[2] = '\0'; blue = strtol(color, NULL, 16); /* Sane check */ if (red > NCP5623C_MAX_VALUE) { red = NCP5623C_MAX_VALUE; } if (green > NCP5623C_MAX_VALUE) { green = NCP5623C_MAX_VALUE; } if (blue > NCP5623C_MAX_VALUE) { blue = NCP5623C_MAX_VALUE; } /* Setup LED R */ ret = ncp5623c_i2c_write_byte(priv, NCP5623C_PWM1, red); if (ret != OK) { lcderr("ERROR: Could not set red led\n"); return ret; } /* Setup LED G */ ret = ncp5623c_i2c_write_byte(priv, NCP5623C_PWM2, green); if (ret != OK) { lcderr("ERROR: Could not set green led\n"); return ret; } /* Setup LED B */ ret = ncp5623c_i2c_write_byte(priv, NCP5623C_PWM3, blue); if (ret != OK) { lcderr("ERROR: Could not set blue led\n"); return ret; } return buflen; } #endif /* CONFIG_I2C && CONFIG_I2C_NCP5623C */