blob: 1361c5371bc04c0c7684182bac52a82f0b38fb68 [file] [log] [blame]
/*
* Copyright (c) 2015 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file Driver for PCAL9535A I2C-based GPIO driver.
*/
#include <errno.h>
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <misc/util.h>
#include <gpio.h>
#include <i2c.h>
#include "gpio_pcal9535a.h"
#define LOG_LEVEL CONFIG_GPIO_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(gpio_pcal9535a);
/* Register definitions */
#define REG_INPUT_PORT0 0x00
#define REG_INPUT_PORT1 0x01
#define REG_OUTPUT_PORT0 0x02
#define REG_OUTPUT_PORT1 0x03
#define REG_POL_INV_PORT0 0x04
#define REG_POL_INV_PORT1 0x05
#define REG_CONF_PORT0 0x06
#define REG_CONG_PORT1 0x07
#define REG_OUT_DRV_STRENGTH_PORT0_L 0x40
#define REG_OUT_DRV_STRENGTH_PORT0_H 0x41
#define REG_OUT_DRV_STRENGTH_PORT1_L 0x42
#define REG_OUT_DRV_STRENGTH_PORT1_H 0x43
#define REG_INPUT_LATCH_PORT0 0x44
#define REG_INPUT_LATCH_PORT1 0x45
#define REG_PUD_EN_PORT0 0x46
#define REG_PUD_EN_PORT1 0x47
#define REG_PUD_SEL_PORT0 0x48
#define REG_PUD_SEL_PORT1 0x49
#define REG_INT_MASK_PORT0 0x4A
#define REG_INT_MASK_PORT1 0x4B
#define REG_INT_STATUS_PORT0 0x4C
#define REG_INT_STATUS_PORT1 0x4D
#define REG_OUTPUT_PORT_CONF 0x4F
/**
* @brief Check to see if a I2C master is identified for communication.
*
* @param dev Device struct.
* @return 1 if I2C master is identified, 0 if not.
*/
static inline int has_i2c_master(struct device *dev)
{
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
struct device * const i2c_master = drv_data->i2c_master;
if (i2c_master)
return 1;
else
return 0;
}
/**
* @brief Read both port 0 and port 1 registers of certain register function.
*
* Given the register in reg, read the pair of port 0 and port 1.
*
* @param dev Device struct of the PCAL9535A.
* @param reg Register to read (the PORT0 of the pair of registers).
* @param buf Buffer to read data into.
*
* @return 0 if successful, failed otherwise.
*/
static int read_port_regs(struct device *dev, u8_t reg,
union gpio_pcal9535a_port_data *buf)
{
const struct gpio_pcal9535a_config * const config =
dev->config->config_info;
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
struct device * const i2c_master = drv_data->i2c_master;
u16_t i2c_addr = config->i2c_slave_addr;
int ret;
ret = i2c_burst_read(i2c_master, i2c_addr, reg, buf->byte, 2);
if (ret) {
LOG_ERR("PCAL9535A[0x%X]: error reading register 0x%X (%d)",
i2c_addr, reg, ret);
goto error;
}
LOG_DBG("PCAL9535A[0x%X]: Read: REG[0x%X] = 0x%X, REG[0x%X] = 0x%X",
i2c_addr, reg, buf->byte[0], (reg + 1), buf->byte[1]);
error:
return ret;
}
/**
* @brief Write both port 0 and port 1 registers of certain register function.
*
* Given the register in reg, write the pair of port 0 and port 1.
*
* @param dev Device struct of the PCAL9535A.
* @param reg Register to write into (the PORT0 of the pair of registers).
* @param buf Buffer to write data from.
*
* @return 0 if successful, failed otherwise.
*/
static int write_port_regs(struct device *dev, u8_t reg,
union gpio_pcal9535a_port_data *buf)
{
const struct gpio_pcal9535a_config * const config =
dev->config->config_info;
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
struct device * const i2c_master = drv_data->i2c_master;
u16_t i2c_addr = config->i2c_slave_addr;
int ret;
LOG_DBG("PCAL9535A[0x%X]: Write: REG[0x%X] = 0x%X, REG[0x%X] = "
"0x%X", i2c_addr, reg, buf->byte[0], (reg + 1),
buf->byte[1]);
ret = i2c_burst_write(i2c_master, i2c_addr, reg, buf->byte, 2);
if (ret) {
LOG_ERR("PCAL9535A[0x%X]: error writing from register 0x%X "
"(%d)", i2c_addr, reg, ret);
}
return ret;
}
/**
* @brief Setup the pin direction (input or output)
*
* @param dev Device struct of the PCAL9535A
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param flags Flags of pin or port
*
* @return 0 if successful, failed otherwise
*/
static int setup_pin_dir(struct device *dev, int access_op,
u32_t pin, int flags)
{
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
union gpio_pcal9535a_port_data *port = &drv_data->reg_cache.dir;
u16_t bit_mask;
u16_t new_value = 0U;
int ret;
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
bit_mask = 1 << pin;
/* Config 0 == output, 1 == input */
if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
new_value = 1 << pin;
}
port->all &= ~bit_mask;
port->all |= new_value;
break;
case GPIO_ACCESS_BY_PORT:
/* Config 0 == output, 1 == input */
if ((flags & GPIO_DIR_MASK) == GPIO_DIR_IN) {
port->all = 0xFFFF;
} else {
port->all = 0x0;
}
break;
default:
ret = -ENOTSUP;
goto done;
}
ret = write_port_regs(dev, REG_CONF_PORT0, port);
done:
return ret;
}
/**
* @brief Setup the pin pull up/pull down status
*
* @param dev Device struct of the PCAL9535A
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param flags Flags of pin or port
*
* @return 0 if successful, failed otherwise
*/
static int setup_pin_pullupdown(struct device *dev, int access_op,
u32_t pin, int flags)
{
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
union gpio_pcal9535a_port_data *port;
u16_t bit_mask;
u16_t new_value = 0U;
int ret;
/* If disabling pull up/down, there is no need to set the selection
* register. Just go straight to disabling.
*/
if ((flags & GPIO_PUD_MASK) == GPIO_PUD_NORMAL) {
goto en_dis;
}
/* Setup pin pull up or pull down */
port = &drv_data->reg_cache.pud_sel;
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
bit_mask = 1 << pin;
/* pull down == 0, pull up == 1*/
if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
new_value = 1 << pin;
}
port->all &= ~bit_mask;
port->all |= new_value;
break;
case GPIO_ACCESS_BY_PORT:
/* pull down == 0, pull up == 1*/
if ((flags & GPIO_PUD_MASK) == GPIO_PUD_PULL_UP) {
port->all = 0xFFFF;
} else {
port->all = 0x0;
}
break;
default:
ret = -ENOTSUP;
goto done;
}
ret = write_port_regs(dev, REG_PUD_SEL_PORT0, port);
if (ret) {
goto done;
}
en_dis:
/* enable/disable pull up/down */
port = &drv_data->reg_cache.pud_en;
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
bit_mask = 1 << pin;
if ((flags & GPIO_PUD_MASK) != GPIO_PUD_NORMAL) {
new_value = 1 << pin;
}
port->all &= ~bit_mask;
port->all |= new_value;
break;
case GPIO_ACCESS_BY_PORT:
if ((flags & GPIO_PUD_MASK) != GPIO_PUD_NORMAL) {
port->all = 0xFFFF;
} else {
port->all = 0x0;
}
break;
default:
ret = -ENOTSUP;
goto done;
}
ret = write_port_regs(dev, REG_PUD_EN_PORT0, port);
done:
return ret;
}
/**
* @brief Setup the polarity of pin or port
*
* @param dev Device struct of the PCAL9535A
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param flags Flags of pin or port
*
* @return 0 if successful, failed otherwise
*/
static int setup_pin_polarity(struct device *dev, int access_op,
u32_t pin, int flags)
{
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
union gpio_pcal9535a_port_data *port = &drv_data->reg_cache.pol_inv;
u16_t bit_mask;
u16_t new_value = 0U;
int ret;
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
bit_mask = BIT(pin);
/* normal == 0, invert == 1 */
if ((flags & GPIO_POL_MASK) == GPIO_POL_INV) {
new_value = BIT(pin);
}
port->all &= ~bit_mask;
port->all |= new_value;
break;
case GPIO_ACCESS_BY_PORT:
/* normal == 0, invert == 1 */
if ((flags & GPIO_POL_MASK) == GPIO_POL_INV) {
port->all = 0xFFFF;
} else {
port->all = 0x0;
}
break;
default:
ret = -ENOTSUP;
goto done;
}
ret = write_port_regs(dev, REG_POL_INV_PORT0, port);
if (!ret) {
drv_data->out_pol_inv = port->all;
}
done:
return ret;
}
/**
* @brief Configure pin or port
*
* @param dev Device struct of the PCAL9535A
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param flags Flags of pin or port
*
* @return 0 if successful, failed otherwise
*/
static int gpio_pcal9535a_config(struct device *dev, int access_op,
u32_t pin, int flags)
{
int ret;
#if (CONFIG_GPIO_LOG_LEVEL >= LOG_LEVEL_DEBUG)
const struct gpio_pcal9535a_config * const config =
dev->config->config_info;
u16_t i2c_addr = config->i2c_slave_addr;
#endif
if (flags & GPIO_INT) {
return -ENOTSUP;
}
if (!has_i2c_master(dev)) {
return -EINVAL;
}
ret = setup_pin_dir(dev, access_op, pin, flags);
if (ret) {
LOG_ERR("PCAL9535A[0x%X]: error setting pin direction (%d)",
i2c_addr, ret);
goto done;
}
ret = setup_pin_polarity(dev, access_op, pin, flags);
if (ret) {
LOG_ERR("PCAL9535A[0x%X]: error setting pin polarity (%d)",
i2c_addr, ret);
goto done;
}
ret = setup_pin_pullupdown(dev, access_op, pin, flags);
if (ret) {
LOG_ERR("PCAL9535A[0x%X]: error setting pin pull up/down "
"(%d)", i2c_addr, ret);
goto done;
}
done:
return ret;
}
/**
* @brief Set the pin or port output
*
* @param dev Device struct of the PCAL9535A
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param value Value to set (0 or 1)
*
* @return 0 if successful, failed otherwise
*/
static int gpio_pcal9535a_write(struct device *dev, int access_op,
u32_t pin, u32_t value)
{
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
union gpio_pcal9535a_port_data *port = &drv_data->reg_cache.output;
u16_t bit_mask;
u16_t new_value;
int ret;
if (!has_i2c_master(dev)) {
return -EINVAL;
}
/* Invert input value for pins configurated as active low. */
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
bit_mask = BIT(pin);
new_value = (value << pin) & bit_mask;
new_value ^= (drv_data->out_pol_inv & bit_mask);
new_value &= bit_mask;
port->all &= ~bit_mask;
port->all |= new_value;
break;
case GPIO_ACCESS_BY_PORT:
port->all = value;
bit_mask = drv_data->out_pol_inv;
new_value = value & bit_mask;
new_value ^= drv_data->out_pol_inv;
new_value &= bit_mask;
port->all &= ~bit_mask;
port->all |= new_value;
break;
default:
ret = -ENOTSUP;
goto done;
}
ret = write_port_regs(dev, REG_OUTPUT_PORT0, port);
done:
return ret;
}
/**
* @brief Read the pin or port status
*
* @param dev Device struct of the PCAL9535A
* @param access_op Access operation (pin or port)
* @param pin The pin number
* @param value Value of input pin(s)
*
* @return 0 if successful, failed otherwise
*/
static int gpio_pcal9535a_read(struct device *dev, int access_op,
u32_t pin, u32_t *value)
{
union gpio_pcal9535a_port_data buf;
int ret;
if (!has_i2c_master(dev)) {
return -EINVAL;
}
ret = read_port_regs(dev, REG_INPUT_PORT0, &buf);
if (ret != 0) {
goto done;
}
switch (access_op) {
case GPIO_ACCESS_BY_PIN:
*value = (buf.all >> pin) & 0x01;
break;
case GPIO_ACCESS_BY_PORT:
*value = buf.all;
break;
default:
ret = -ENOTSUP;
break;
}
done:
return ret;
}
static const struct gpio_driver_api gpio_pcal9535a_drv_api_funcs = {
.config = gpio_pcal9535a_config,
.write = gpio_pcal9535a_write,
.read = gpio_pcal9535a_read,
};
/**
* @brief Initialization function of PCAL9535A
*
* @param dev Device struct
* @return 0 if successful, failed otherwise.
*/
static int gpio_pcal9535a_init(struct device *dev)
{
const struct gpio_pcal9535a_config * const config =
dev->config->config_info;
struct gpio_pcal9535a_drv_data * const drv_data =
(struct gpio_pcal9535a_drv_data * const)dev->driver_data;
struct device *i2c_master;
/* Find out the device struct of the I2C master */
i2c_master = device_get_binding((char *)config->i2c_master_dev_name);
if (!i2c_master) {
return -EINVAL;
}
drv_data->i2c_master = i2c_master;
return 0;
}
/* Initialization for PCAL9535A_0 */
#ifdef CONFIG_GPIO_PCAL9535A_0
static const struct gpio_pcal9535a_config gpio_pcal9535a_0_cfg = {
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_0_I2C_MASTER_DEV_NAME,
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_0_I2C_ADDR,
};
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_0_drvdata = {
/* Default for registers according to datasheet */
.reg_cache.output = { .all = 0xFFFF },
.reg_cache.pol_inv = { .all = 0x0 },
.reg_cache.dir = { .all = 0xFFFF },
.reg_cache.pud_en = { .all = 0x0 },
.reg_cache.pud_sel = { .all = 0xFFFF },
};
/* This has to init after I2C master */
DEVICE_AND_API_INIT(gpio_pcal9535a_0, CONFIG_GPIO_PCAL9535A_0_DEV_NAME,
gpio_pcal9535a_init,
&gpio_pcal9535a_0_drvdata, &gpio_pcal9535a_0_cfg,
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
&gpio_pcal9535a_drv_api_funcs);
#endif /* CONFIG_GPIO_PCAL9535A_0 */
/* Initialization for PCAL9535A_1 */
#ifdef CONFIG_GPIO_PCAL9535A_1
static const struct gpio_pcal9535a_config gpio_pcal9535a_1_cfg = {
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_1_I2C_MASTER_DEV_NAME,
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_1_I2C_ADDR,
};
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_1_drvdata = {
/* Default for registers according to datasheet */
.reg_cache.output = { .all = 0xFFFF },
.reg_cache.pol_inv = { .all = 0x0 },
.reg_cache.dir = { .all = 0xFFFF },
.reg_cache.pud_en = { .all = 0x0 },
.reg_cache.pud_sel = { .all = 0xFFFF },
};
/* This has to init after I2C master */
DEVICE_AND_API_INIT(gpio_pcal9535a_1, CONFIG_GPIO_PCAL9535A_1_DEV_NAME,
gpio_pcal9535a_init,
&gpio_pcal9535a_1_drvdata, &gpio_pcal9535a_1_cfg,
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
&gpio_pcal9535a_drv_api_funcs);
#endif /* CONFIG_GPIO_PCAL9535A_1 */
/* Initialization for PCAL9535A_2 */
#ifdef CONFIG_GPIO_PCAL9535A_2
static const struct gpio_pcal9535a_config gpio_pcal9535a_2_cfg = {
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_2_I2C_MASTER_DEV_NAME,
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_2_I2C_ADDR,
};
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_2_drvdata = {
/* Default for registers according to datasheet */
.reg_cache.output = { .all = 0xFFFF },
.reg_cache.pol_inv = { .all = 0x0 },
.reg_cache.dir = { .all = 0xFFFF },
.reg_cache.pud_en = { .all = 0x0 },
.reg_cache.pud_sel = { .all = 0xFFFF },
};
/* This has to init after I2C master */
DEVICE_AND_API_INIT(gpio_pcal9535a_2, CONFIG_GPIO_PCAL9535A_2_DEV_NAME,
gpio_pcal9535a_init,
&gpio_pcal9535a_2_drvdata, &gpio_pcal9535a_2_cfg,
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
&gpio_pcal9535a_drv_api_funcs);
#endif /* CONFIG_GPIO_PCAL9535A_2 */
/* Initialization for PCAL9535A_3 */
#ifdef CONFIG_GPIO_PCAL9535A_3
static const struct gpio_pcal9535a_config gpio_pcal9535a_3_cfg = {
.i2c_master_dev_name = CONFIG_GPIO_PCAL9535A_3_I2C_MASTER_DEV_NAME,
.i2c_slave_addr = CONFIG_GPIO_PCAL9535A_3_I2C_ADDR,
};
static struct gpio_pcal9535a_drv_data gpio_pcal9535a_3_drvdata = {
/* Default for registers according to datasheet */
.reg_cache.output = { .all = 0xFFFF },
.reg_cache.pol_inv = { .all = 0x0 },
.reg_cache.dir = { .all = 0xFFFF },
.reg_cache.pud_en = { .all = 0x0 },
.reg_cache.pud_sel = { .all = 0xFFFF },
};
/* This has to init after I2C master */
DEVICE_AND_API_INIT(gpio_pcal9535a_3, CONFIG_GPIO_PCAL9535A_3_DEV_NAME,
gpio_pcal9535a_init,
&gpio_pcal9535a_3_drvdata, &gpio_pcal9535a_3_cfg,
POST_KERNEL, CONFIG_GPIO_PCAL9535A_INIT_PRIORITY,
&gpio_pcal9535a_drv_api_funcs);
#endif /* CONFIG_GPIO_PCAL9535A_3 */