drivers: i2c: gpio: convert to using devicetree for instances
Convert the GPIO bit banging I2C controller driver to use devicetree bindings for configuring instances. Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen
Kumar Gala
parent
ea61a6e3fd
commit
911b6a0e9f
2 changed files with 68 additions and 173 deletions
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@ -6,143 +6,3 @@ config I2C_GPIO
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select I2C_BITBANG
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help
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Enable software driven (bit banging) I2C support using GPIO pins
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# ---------- Port 0 ----------
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config I2C_GPIO_0
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bool "Enable GPIO Bit Bang I2C device 0"
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depends on I2C_GPIO
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help
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This tells the driver to configure the I2C device at boot, depending
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on the additional configuration options below.
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if I2C_GPIO_0
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config I2C_GPIO_0_NAME
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string "GPIO Bit Bang I2C device 0 device name"
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default "I2C_0"
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help
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This is the device name for the I2C device, and is included in the
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device struct.
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config I2C_GPIO_0_GPIO
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string "Bit Bang I2C device 0 GPIO name"
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help
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This is the name of the GPIO device that controls the I2C lines.
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config I2C_GPIO_0_SCL_PIN
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int "Bit Bang I2C device 0 GPIO pin number for SCL"
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help
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This is the GPIO pin number for the I2S SCL line
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config I2C_GPIO_0_SDA_PIN
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int "Bit Bang I2C device 0 GPIO pin number for SDA"
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help
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This is the GPIO pin number for the I2S SDA line
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endif # I2C_GPIO_0
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# ---------- Port 1 ----------
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config I2C_GPIO_1
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bool "Enable GPIO Bit Bang I2C device 1"
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depends on I2C_GPIO
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help
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This tells the driver to configure the I2C device at boot, depending
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on the additional configuration options below.
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if I2C_GPIO_1
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config I2C_GPIO_1_NAME
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string "Bit Bang I2C device 1 device name"
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default "I2C_1"
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help
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This is the device name for the I2C device, and is included in the
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device struct.
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config I2C_GPIO_1_GPIO
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string "Bit Bang I2C device 1 GPIO name"
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help
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This is the name of the GPIO device that controls the I2C lines.
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config I2C_GPIO_1_SCL_PIN
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int "Bit Bang I2C device 1 GPIO pin number for SCL"
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help
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This is the GPIO pin number for the I2S SCL line
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config I2C_GPIO_1_SDA_PIN
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int "Bit Bang I2C device 1 GPIO pin number for SDA"
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help
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This is the GPIO pin number for the I2S SDA line
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endif # I2C_GPIO_1
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# ---------- Port 2 ----------
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config I2C_GPIO_2
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bool "Enable GPIO Bit Bang I2C device 2"
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depends on I2C_GPIO
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help
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This tells the driver to configure the I2C device at boot, depending
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on the additional configuration options below.
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if I2C_GPIO_2
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config I2C_GPIO_2_NAME
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string "Bit Bang I2C device 2 device name"
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default "I2C_2"
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help
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This is the device name for the I2C device, and is included in the
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device struct.
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config I2C_GPIO_2_GPIO
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string "Bit Bang I2C device 2 GPIO name"
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help
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This is the name of the GPIO device that controls the I2C lines.
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config I2C_GPIO_2_SCL_PIN
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int "Bit Bang I2C device 2 GPIO pin number for SCL"
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help
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This is the GPIO pin number for the I2S SCL line
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config I2C_GPIO_2_SDA_PIN
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int "Bit Bang I2C device 2 GPIO pin number for SDA"
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help
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This is the GPIO pin number for the I2S SDA line
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endif # I2C_GPIO_2
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# ---------- Port 3 ----------
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config I2C_GPIO_3
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bool "Enable GPIO Bit Bang I2C device 3"
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depends on I2C_GPIO
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help
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This tells the driver to configure the I2C device at boot, depending
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on the additional configuration options below.
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if I2C_GPIO_3
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config I2C_GPIO_3_NAME
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string "Bit Bang I2C device 3 device name"
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default "I2C_3"
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help
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This is the device name for the I2C device, and is included in the
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device struct.
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config I2C_GPIO_3_GPIO
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string "Bit Bang I2C device 3 GPIO name"
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help
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This is the name of the GPIO device that controls the I2C lines.
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config I2C_GPIO_3_SCL_PIN
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int "Bit Bang I2C device 3 GPIO pin number for SCL"
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help
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This is the GPIO pin number for the I2C SCL line
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config I2C_GPIO_3_SDA_PIN
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int "Bit Bang I2C device 3 GPIO pin number for SDA"
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help
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This is the GPIO pin number for the I2C SDA line
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endif # I2C_GPIO_3
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@ -1,16 +1,19 @@
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/*
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* Copyright (c) 2020 Vestas Wind Systems A/S
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* Copyright (c) 2017 Linaro Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT gpio_i2c
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/**
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* @file
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* @brief Driver for software driven I2C using GPIO lines
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*
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* This driver implements an I2C interface by driving two GPIO lines under
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* software control. The GPIO pins used must be preconfigured to to a suitable
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* state, i.e. the SDA pin as open-colector/open-drain with a pull-up resistor
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* software control. The GPIO pins used must be configured (through devicetree and pinmux) with suitable
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* flags, i.e. the SDA pin as open-colector/open-drain with a pull-up resistor
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* (possibly as an external component attached to the pin). When the SDA pin
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* is read it must return the state of the physical hardware line, not just the
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* last state written to it for output.
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@ -24,41 +27,51 @@
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#include <errno.h>
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#include <drivers/gpio.h>
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#include <drivers/i2c.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(i2c_gpio);
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#include "i2c-priv.h"
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#include "i2c_bitbang.h"
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/* Driver config */
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struct i2c_gpio_config {
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char *gpio_name;
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u8_t scl_pin;
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u8_t sda_pin;
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const char *scl_gpio_name;
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const char *sda_gpio_name;
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gpio_pin_t scl_pin;
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gpio_pin_t sda_pin;
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gpio_dt_flags_t scl_flags;
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gpio_dt_flags_t sda_flags;
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u32_t bitrate;
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};
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/* Driver instance data */
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struct i2c_gpio_context {
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struct i2c_bitbang bitbang; /* Bit-bang library data */
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struct device *gpio; /* GPIO used for I2C lines */
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u8_t scl_pin; /* Pin on gpio used for SCL line */
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u8_t sda_pin; /* Pin on gpio used for SDA line */
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struct device *scl_gpio; /* GPIO used for I2C SCL line */
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struct device *sda_gpio; /* GPIO used for I2C SDA line */
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gpio_pin_t scl_pin; /* Pin on gpio used for SCL line */
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gpio_pin_t sda_pin; /* Pin on gpio used for SDA line */
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};
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static void i2c_gpio_set_scl(void *io_context, int state)
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{
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struct i2c_gpio_context *context = io_context;
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gpio_pin_set(context->gpio, context->scl_pin, state);
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gpio_pin_set(context->scl_gpio, context->scl_pin, state);
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}
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static void i2c_gpio_set_sda(void *io_context, int state)
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{
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struct i2c_gpio_context *context = io_context;
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gpio_pin_set(context->gpio, context->sda_pin, state);
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gpio_pin_set(context->sda_gpio, context->sda_pin, state);
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}
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static int i2c_gpio_get_sda(void *io_context)
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{
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struct i2c_gpio_context *context = io_context;
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int rc = gpio_pin_get(context->gpio, context->sda_pin);
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int rc = gpio_pin_get(context->sda_gpio, context->sda_pin);
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/* Default high as that would be a NACK */
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return rc != 0;
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@ -83,7 +96,7 @@ static int i2c_gpio_transfer(struct device *dev, struct i2c_msg *msgs,
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struct i2c_gpio_context *context = dev->driver_data;
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return i2c_bitbang_transfer(&context->bitbang, msgs, num_msgs,
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slave_address);
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slave_address);
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}
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static struct i2c_driver_api api = {
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@ -95,16 +108,48 @@ static int i2c_gpio_init(struct device *dev)
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{
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struct i2c_gpio_context *context = dev->driver_data;
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const struct i2c_gpio_config *config = dev->config->config_info;
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u32_t bitrate_cfg;
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int err;
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context->gpio = device_get_binding(config->gpio_name);
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if (!context->gpio) {
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context->scl_gpio = device_get_binding(config->scl_gpio_name);
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if (!context->scl_gpio) {
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LOG_ERR("failed to get SCL GPIO device");
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return -EINVAL;
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}
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err = gpio_config(context->scl_gpio, config->scl_pin,
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config->scl_flags | GPIO_OUTPUT_HIGH);
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if (err) {
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LOG_ERR("failed to configure SCL GPIO pin (err %d)", err);
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return err;
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}
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context->sda_gpio = device_get_binding(config->sda_gpio_name);
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if (!context->sda_gpio) {
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LOG_ERR("failed to get SCL GPIO device");
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return -EINVAL;
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}
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err = gpio_config(context->sda_gpio, config->sda_pin,
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config->sda_flags | GPIO_OUTPUT_HIGH);
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if (err) {
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LOG_ERR("failed to configure SDA GPIO pin (err %d)", err);
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return err;
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}
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context->sda_pin = config->sda_pin;
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context->scl_pin = config->scl_pin;
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i2c_bitbang_init(&context->bitbang, &io_fns, context);
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bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);
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err = i2c_bitbang_configure(&context->bitbang,
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I2C_MODE_MASTER | bitrate_cfg);
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if (err) {
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LOG_ERR("failed to configure I2C bitbang (err %d)", err);
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return err;
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}
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return 0;
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}
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@ -113,29 +158,19 @@ static int i2c_gpio_init(struct device *dev)
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static struct i2c_gpio_context i2c_gpio_dev_data_##_num; \
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\
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static const struct i2c_gpio_config i2c_gpio_dev_cfg_##_num = { \
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.gpio_name = CONFIG_I2C_GPIO_##_num##_GPIO, \
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.scl_pin = CONFIG_I2C_GPIO_##_num##_SCL_PIN, \
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.sda_pin = CONFIG_I2C_GPIO_##_num##_SDA_PIN, \
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.scl_gpio_name = DT_INST_GPIO_LABEL(_num, scl_gpios), \
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.sda_gpio_name = DT_INST_GPIO_LABEL(_num, sda_gpios), \
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.scl_pin = DT_INST_GPIO_PIN(_num, scl_gpios), \
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.sda_pin = DT_INST_GPIO_PIN(_num, sda_gpios), \
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.scl_flags = DT_INST_GPIO_FLAGS(_num, scl_gpios), \
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.sda_flags = DT_INST_GPIO_FLAGS(_num, sda_gpios), \
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.bitrate = DT_INST_PROP(_num, clock_frequency), \
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}; \
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\
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DEVICE_AND_API_INIT(i2c_gpio_##_num, CONFIG_I2C_GPIO_##_num##_NAME, \
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DEVICE_AND_API_INIT(i2c_gpio_##_num, DT_INST_LABEL(_num), \
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i2c_gpio_init, \
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&i2c_gpio_dev_data_##_num, \
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&i2c_gpio_dev_cfg_##_num, \
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PRE_KERNEL_2, CONFIG_I2C_INIT_PRIORITY, &api)
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#ifdef CONFIG_I2C_GPIO_0
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DEFINE_I2C_GPIO(0);
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#endif
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#ifdef CONFIG_I2C_GPIO_1
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DEFINE_I2C_GPIO(1);
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#endif
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#ifdef CONFIG_I2C_GPIO_2
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DEFINE_I2C_GPIO(2);
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#endif
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#ifdef CONFIG_I2C_GPIO_3
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DEFINE_I2C_GPIO(3);
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#endif
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DT_INST_FOREACH(DEFINE_I2C_GPIO)
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