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74 lines
2.2 KiB
74 lines
2.2 KiB
/* |
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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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/** |
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* @brief Functions for setting and getting the state of the I2C lines. |
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* |
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* These need to be implemented by the user of this library. |
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*/ |
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struct i2c_bitbang_io { |
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/* Set the state of the SCL line (zero/non-zero value) */ |
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void (*set_scl)(void *io_context, int state); |
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#ifdef CONFIG_I2C_GPIO_CLOCK_STRETCHING |
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/* Return the state of the SCL line (zero/non-zero value) */ |
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int (*get_scl)(void *io_context); |
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#endif |
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/* Set the state of the SDA line (zero/non-zero value) */ |
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void (*set_sda)(void *io_context, int state); |
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/* Return the state of the SDA line (zero/non-zero value) */ |
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int (*get_sda)(void *io_context); |
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}; |
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/** |
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* @brief Instance data for i2c_bitbang |
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* |
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* A driver or other code wishing to use the i2c_bitbang library should |
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* create one of these structures then use it via the library APIs. |
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* Structure members are private, and shouldn't be accessed directly. |
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*/ |
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struct i2c_bitbang { |
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const struct i2c_bitbang_io *io; |
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void *io_context; |
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uint32_t delays[2]; |
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uint32_t dev_config; |
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}; |
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/** |
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* @brief Initialize an i2c_bitbang instance |
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* |
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* @param bitbang The instance to initialize |
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* @param io Functions to use for controlling I2C bus lines |
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* @param io_context Context pointer to pass to i/o functions when then are |
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* called. |
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*/ |
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void i2c_bitbang_init(struct i2c_bitbang *bitbang, |
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const struct i2c_bitbang_io *io, void *io_context); |
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/** |
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* Implementation of the functionality required by the 'configure' function |
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* in struct i2c_driver_api. |
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*/ |
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int i2c_bitbang_configure(struct i2c_bitbang *bitbang, uint32_t dev_config); |
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/** |
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* Implementation of the functionality required by the 'get_config' function |
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* in struct i2c_driver_api. |
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*/ |
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int i2c_bitbang_get_config(struct i2c_bitbang *context, uint32_t *config); |
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/** |
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* Implementation of the functionality required by the 'recover_bus' |
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* function in struct i2c_driver_api. |
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*/ |
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int i2c_bitbang_recover_bus(struct i2c_bitbang *bitbang); |
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/** |
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* Implementation of the functionality required by the 'transfer' function |
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* in struct i2c_driver_api. |
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*/ |
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int i2c_bitbang_transfer(struct i2c_bitbang *bitbang, |
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struct i2c_msg *msgs, uint8_t num_msgs, |
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uint16_t slave_address);
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