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nuttx/drivers/leds/pca9635pw.c

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/****************************************************************************
* drivers/leds/pca9635pw.c
*
* Copyright (C) 2015 DS-Automotion GmbH. All rights reserved.
* Author: Alexander Entinger <a.entinger@ds-automotion.com>
*
* 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 <nuttx/config.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/kmalloc.h>
#include <nuttx/leds/pca9635pw.h>
#if defined(CONFIG_I2C) && defined(CONFIG_PCA9635PW)
/****************************************************************************
* Private Type Definitions
****************************************************************************/
struct pca9635pw_dev_s
{
FAR struct i2c_master_s *i2c;
uint8_t i2c_addr;
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int pca9635pw_i2c_write_byte(FAR struct pca9635pw_dev_s *priv,
uint8_t const reg_addr,
uint8_t const reg_val);
static int pca9635pw_set_led_mode(FAR struct pca9635pw_dev_s *priv,
uint8_t const led_out_x_mode);
static int pca9635pw_open(FAR struct file *filep);
static int pca9635pw_close(FAR struct file *filep);
static int pca9635pw_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_pca9635pw_fileops =
{
pca9635pw_open, /* open */
pca9635pw_close, /* close */
0, /* read */
0, /* write */
0, /* seek */
pca9635pw_ioctl, /* ioctl */
0 /* poll */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: pca9635pw_i2c_write_byte
*
* Description:
* Write a single byte to one of the PCA9635PW configuration registers.
*
****************************************************************************/
static int pca9635pw_i2c_write_byte(FAR struct pca9635pw_dev_s *priv,
uint8_t const reg_addr,
uint8_t const reg_val)
{
struct i2c_config_s config;
/* assemble the 2 byte message comprised of reg_addr and reg_val */
uint8_t const BUFFER_SIZE = 2;
uint8_t buffer[BUFFER_SIZE];
buffer[0] = reg_addr;
buffer[1] = reg_val;
/* Setup up the I2C configuration */
config.frequency = I2C_BUS_FREQ_HZ;
config.address = priv->i2c_addr;
config.addrlen = 7;
/* Write the register address followed by the data (no RESTART) */
lcdllinfo("i2c addr: 0x%02X reg addr: 0x%02X value: 0x%02X\n", priv->i2c_addr,
buffer[0], buffer[1]);
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: pca9635pw_set_led_mode
*
* Description:
* Set the led output mode (see PCA9635PW_LED_OUT_x register value definitions)
*
****************************************************************************/
static int pca9635pw_set_led_mode(FAR struct pca9635pw_dev_s *priv,
uint8_t const led_out_x_mode)
{
uint8_t current_ledout_reg = PCA9635PW_LED_OUT_0;
for (; current_ledout_reg <= PCA9635PW_LED_OUT_3; current_ledout_reg++)
{
int const ret = pca9635pw_i2c_write_byte(priv, current_ledout_reg,
led_out_x_mode);
if (ret != OK)
{
return ret;
}
}
return OK;
}
/****************************************************************************
* Name: pca9635pw_open
*
* Description:
* This function is called whenever a PCA9635PW device is opened.
*
****************************************************************************/
static int pca9635pw_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct pca9635pw_dev_s *priv = inode->i_private;
int ret = -1;
/* Wake up the PCA9635PW (sleep bit PCA9635PW_MODE_1_SLEEP is set to zero
* and enable register auto increment - this way we can write to multiple
* consecutive I2C registers without having to always write first the
* address and then the data byte.
*/
uint8_t const PCA9635PW_MODE_1_INITIAL_VALUE = PCA9635PW_MODE_1_AI2;
ret = pca9635pw_i2c_write_byte(priv, PCA9635PW_MODE_1,
PCA9635PW_MODE_1_INITIAL_VALUE);
if (ret != OK)
{
lcderr("ERROR: Could not set initial config for PCA9635PW_MODE_1\n");
return ret;
}
/* Configure the PCA9635PW output drivers for totem-pole structure since
* the output of the PCA9635PW are coupled with the Gates of MOSFET's
* which then drive the LED's. Since we have this kind of schematic
* structure we also need to invert the output.
*/
uint8_t const PCA9635PW_MODE_2_INITIAL_VALUE =
PCA9635PW_MODE_2_INVRT | PCA9635PW_MODE_2_OUTDRV;
ret = pca9635pw_i2c_write_byte(priv, PCA9635PW_MODE_2,
PCA9635PW_MODE_2_INITIAL_VALUE);
if (ret != OK)
{
lcderr("ERROR: Could not set initial config for PCA9635PW_MODE_2\n");
return ret;
}
/* A delay of 500 us is necessary since this is the maximum time which the
* oscillator of the PCA9635PW needs to be up and running once sleep mode was
* left.
*/
usleep(500);
/* Turn all led drivers to mode 2 in which the led brightness is controlled
* by the indiviual pwm registers.
*/
ret = pca9635pw_set_led_mode(priv, PCA9635PW_LED_OUT_x_MODE_2);
if (ret != OK)
{
lcderr("ERROR: Could not set led driver outputs to MODE2 (LED's brightness are "
"controlled by pwm registers)\n");
return ret;
}
return OK;
}
/****************************************************************************
* Name: pca9635pw_close
*
* Description:
* This function is called whenever a PCA9635PW device is closed.
*
****************************************************************************/
static int pca9635pw_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
FAR struct pca9635pw_dev_s *priv = inode->i_private;
int ret = -1;
/* Turn all led drivers off */
ret = pca9635pw_set_led_mode(priv, PCA9635PW_LED_OUT_x_MODE_0);
if (ret != OK)
{
lcderr("ERROR: Could not set led driver outputs to MODE0 (LED's are off)\n");
return ret;
}
/* Send the PCA9635PW back to sleep mode */
uint8_t const PCA9635PW_MODE_1_FINAL_VALUE = PCA9635PW_MODE_1_SLEEP;
ret =pca9635pw_i2c_write_byte(priv, PCA9635PW_MODE_1,
PCA9635PW_MODE_1_FINAL_VALUE);
if (ret != OK)
{
return ret;
}
return OK;
}
/****************************************************************************
* Name: pca9635pw_close
*
* Description:
* This function is called whenever an ioctl call to a PCA9635PW is performed.
*
****************************************************************************/
static int pca9635pw_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode = filep->f_inode;
FAR struct pca9635pw_dev_s *priv = inode->i_private;
int ret = OK;
lcdllinfo("cmd: %d arg: %ld\n", cmd, arg);
switch (cmd)
{
/* Set the brightness of an indivual LED. Arg: pca9635pw_led_brightness_s
* pointer.
*/
case PWMIOC_SETLED_BRIGHTNESS:
{
/* Retrieve the information handed over as argument for this ioctl */
FAR const struct pca9635pw_setled_brightness_arg_s *ptr =
(FAR const struct pca9635pw_setled_brightness_arg_s *)((uintptr_t)arg);
DEBUGASSERT(ptr != NULL);
/* Set the brighntess of the led */
ret = pca9635pw_i2c_write_byte(priv, ptr->led, ptr->brightness);
}
break;
/* The used ioctl command was invalid */
default:
{
lcderr("ERROR: Unrecognized cmd: %d\n", cmd);
ret = -ENOTTY;
}
break;
}
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: pca9635pw_register
*
* Description:
* Register the PCA9635PW device as 'devpath'
*
* Input Parameters:
* devpath - The full path to the driver to register. E.g., "/dev/leddrv0".
* i2c - An instance of the I2C interface to use to communicate
* with the LM92.
* pca9635pw_i2c_addr
* - The I2C address of the PCA9635PW.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int pca9635pw_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
uint8_t const pca9635pw_i2c_addr)
{
/* Sanity check */
DEBUGASSERT(i2c != NULL);
/* Initialize the PCA9635PW device structure */
FAR struct pca9635pw_dev_s *priv =
(FAR struct pca9635pw_dev_s *)kmm_malloc(sizeof(struct pca9635pw_dev_s));
if (priv == NULL)
{
lcderr("ERROR: Failed to allocate instance of pca9635pw_dev_s\n");
return -ENOMEM;
}
priv->i2c = i2c;
priv->i2c_addr = pca9635pw_i2c_addr;
/* Register the character driver */
int const ret = register_driver(devpath, &g_pca9635pw_fileops, 666, priv);
if (ret != OK)
{
lcderr("ERROR: Failed to register driver: %d\n", ret);
kmm_free(priv);
return ret;
}
return OK;
}
#endif /* CONFIG_I2C && CONFIG_I2C_PCA9635PW */
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