936df1bcb5
Squashed commit of the following:
Change all calls to usleep() in the OS proper to calls to nxsig_usleep()
sched/signal: Add a new OS internal function nxsig_usleep() that is functionally equivalent to usleep() but does not cause a cancellaption point and does not modify the errno variable.
sched/signal: Add a new OS internal function nxsig_sleep() that is functionally equivalent to sleep() but does not cause a cancellaption point.
377 lines
12 KiB
C
377 lines
12 KiB
C
/****************************************************************************
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* drivers/leds/pca9635pw.c
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*
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* Copyright (C) 2015 DS-Automotion GmbH. All rights reserved.
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* Author: Alexander Entinger <a.entinger@ds-automotion.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/signal.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/leds/pca9635pw.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_PCA9635PW)
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/****************************************************************************
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* Private Type Definitions
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****************************************************************************/
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struct pca9635pw_dev_s
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{
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FAR struct i2c_master_s *i2c;
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uint8_t i2c_addr;
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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 pca9635pw_i2c_write_byte(FAR struct pca9635pw_dev_s *priv,
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uint8_t const reg_addr,
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uint8_t const reg_val);
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static int pca9635pw_set_led_mode(FAR struct pca9635pw_dev_s *priv,
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uint8_t const led_out_x_mode);
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static int pca9635pw_open(FAR struct file *filep);
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static int pca9635pw_close(FAR struct file *filep);
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static int pca9635pw_ioctl(FAR struct file *filep, int cmd, unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_pca9635pw_fileops =
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{
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pca9635pw_open, /* open */
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pca9635pw_close, /* close */
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0, /* read */
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0, /* write */
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0, /* seek */
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pca9635pw_ioctl, /* ioctl */
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0 /* poll */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pca9635pw_i2c_write_byte
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*
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* Description:
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* Write a single byte to one of the PCA9635PW configuration registers.
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*
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****************************************************************************/
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static int pca9635pw_i2c_write_byte(FAR struct pca9635pw_dev_s *priv,
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uint8_t const reg_addr,
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uint8_t const reg_val)
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{
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struct i2c_config_s config;
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/* assemble the 2 byte message comprised of reg_addr and reg_val */
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uint8_t const BUFFER_SIZE = 2;
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uint8_t buffer[BUFFER_SIZE];
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buffer[0] = reg_addr;
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buffer[1] = reg_val;
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/* Setup up the I2C configuration */
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config.frequency = I2C_BUS_FREQ_HZ;
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config.address = priv->i2c_addr;
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config.addrlen = 7;
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/* Write the register address followed by the data (no RESTART) */
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lcdinfo("i2c addr: 0x%02X reg addr: 0x%02X value: 0x%02X\n", priv->i2c_addr,
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buffer[0], buffer[1]);
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ret = i2c_write(priv->i2c, &config, buffer, BUFFER_SIZE);
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if (ret != OK)
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{
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lcderr("ERROR: i2c_write returned error code %d\n", ret);
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: pca9635pw_set_led_mode
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*
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* Description:
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* Set the led output mode (see PCA9635PW_LED_OUT_x register value definitions)
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*
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****************************************************************************/
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static int pca9635pw_set_led_mode(FAR struct pca9635pw_dev_s *priv,
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uint8_t const led_out_x_mode)
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{
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uint8_t current_ledout_reg = PCA9635PW_LED_OUT_0;
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for (; current_ledout_reg <= PCA9635PW_LED_OUT_3; current_ledout_reg++)
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{
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int const ret = pca9635pw_i2c_write_byte(priv, current_ledout_reg,
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led_out_x_mode);
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if (ret != OK)
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{
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return ret;
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}
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}
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return OK;
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}
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/****************************************************************************
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* Name: pca9635pw_open
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*
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* Description:
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* This function is called whenever a PCA9635PW device is opened.
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*
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****************************************************************************/
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static int pca9635pw_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct pca9635pw_dev_s *priv = inode->i_private;
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int ret = -1;
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/* Wake up the PCA9635PW (sleep bit PCA9635PW_MODE_1_SLEEP is set to zero
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* and enable register auto increment - this way we can write to multiple
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* consecutive I2C registers without having to always write first the
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* address and then the data byte.
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*/
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uint8_t const PCA9635PW_MODE_1_INITIAL_VALUE = PCA9635PW_MODE_1_AI2;
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ret = pca9635pw_i2c_write_byte(priv, PCA9635PW_MODE_1,
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PCA9635PW_MODE_1_INITIAL_VALUE);
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if (ret != OK)
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{
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lcderr("ERROR: Could not set initial config for PCA9635PW_MODE_1\n");
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return ret;
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}
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/* Configure the PCA9635PW output drivers for totem-pole structure since
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* the output of the PCA9635PW are coupled with the Gates of MOSFET's
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* which then drive the LED's. Since we have this kind of schematic
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* structure we also need to invert the output.
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*/
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uint8_t const PCA9635PW_MODE_2_INITIAL_VALUE =
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PCA9635PW_MODE_2_INVRT | PCA9635PW_MODE_2_OUTDRV;
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ret = pca9635pw_i2c_write_byte(priv, PCA9635PW_MODE_2,
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PCA9635PW_MODE_2_INITIAL_VALUE);
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if (ret != OK)
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{
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lcderr("ERROR: Could not set initial config for PCA9635PW_MODE_2\n");
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return ret;
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}
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/* A delay of 500 us is necessary since this is the maximum time which the
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* oscillator of the PCA9635PW needs to be up and running once sleep mode was
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* left.
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*/
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nxsig_usleep(500);
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/* Turn all led drivers to mode 2 in which the led brightness is controlled
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* by the indiviual pwm registers.
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*/
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ret = pca9635pw_set_led_mode(priv, PCA9635PW_LED_OUT_x_MODE_2);
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if (ret != OK)
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{
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lcderr("ERROR: Could not set led driver outputs to MODE2 (LED's brightness are "
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"controlled by pwm registers)\n");
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: pca9635pw_close
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*
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* Description:
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* This function is called whenever a PCA9635PW device is closed.
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*
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****************************************************************************/
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static int pca9635pw_close(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct pca9635pw_dev_s *priv = inode->i_private;
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int ret = -1;
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/* Turn all led drivers off */
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ret = pca9635pw_set_led_mode(priv, PCA9635PW_LED_OUT_x_MODE_0);
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if (ret != OK)
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{
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lcderr("ERROR: Could not set led driver outputs to MODE0 (LED's are off)\n");
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return ret;
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}
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/* Send the PCA9635PW back to sleep mode */
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uint8_t const PCA9635PW_MODE_1_FINAL_VALUE = PCA9635PW_MODE_1_SLEEP;
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ret =pca9635pw_i2c_write_byte(priv, PCA9635PW_MODE_1,
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PCA9635PW_MODE_1_FINAL_VALUE);
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if (ret != OK)
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{
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: pca9635pw_close
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*
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* Description:
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* This function is called whenever an ioctl call to a PCA9635PW is performed.
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*
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****************************************************************************/
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static int pca9635pw_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct pca9635pw_dev_s *priv = inode->i_private;
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int ret = OK;
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lcdinfo("cmd: %d arg: %ld\n", cmd, arg);
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switch (cmd)
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{
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/* Set the brightness of an indivual LED. Arg: pca9635pw_led_brightness_s
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* pointer.
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*/
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case PWMIOC_SETLED_BRIGHTNESS:
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{
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/* Retrieve the information handed over as argument for this ioctl */
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FAR const struct pca9635pw_setled_brightness_arg_s *ptr =
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(FAR const struct pca9635pw_setled_brightness_arg_s *)((uintptr_t)arg);
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DEBUGASSERT(ptr != NULL);
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/* Set the brighntess of the led */
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ret = pca9635pw_i2c_write_byte(priv, ptr->led, ptr->brightness);
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}
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break;
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/* The used ioctl command was invalid */
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default:
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{
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lcderr("ERROR: Unrecognized cmd: %d\n", cmd);
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ret = -ENOTTY;
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}
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break;
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: pca9635pw_register
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*
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* Description:
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* Register the PCA9635PW device as 'devpath'
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/leddrv0".
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* i2c - An instance of the I2C interface to use to communicate
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* with the LM92.
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* pca9635pw_i2c_addr
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* - The I2C address of the PCA9635PW.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int pca9635pw_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
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uint8_t const pca9635pw_i2c_addr)
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{
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/* Sanity check */
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DEBUGASSERT(i2c != NULL);
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/* Initialize the PCA9635PW device structure */
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FAR struct pca9635pw_dev_s *priv =
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(FAR struct pca9635pw_dev_s *)kmm_malloc(sizeof(struct pca9635pw_dev_s));
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if (priv == NULL)
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{
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lcderr("ERROR: Failed to allocate instance of pca9635pw_dev_s\n");
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return -ENOMEM;
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}
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priv->i2c = i2c;
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priv->i2c_addr = pca9635pw_i2c_addr;
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/* Register the character driver */
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int const ret = register_driver(devpath, &g_pca9635pw_fileops, 666, priv);
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if (ret != OK)
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{
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lcderr("ERROR: Failed to register driver: %d\n", ret);
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kmm_free(priv);
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return ret;
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}
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return OK;
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}
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#endif /* CONFIG_I2C && CONFIG_I2C_PCA9635PW */
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