46 lines
1.8 KiB
C
46 lines
1.8 KiB
C
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#ifndef __LINUX_PCF857X_H
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#define __LINUX_PCF857X_H
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/**
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* struct pcf857x_platform_data - data to set up pcf857x driver
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* @gpio_base: number of the chip's first GPIO
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* @n_latch: optional bit-inverse of initial register value; if
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* you leave this initialized to zero the driver will act
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* like the chip was just reset
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* @setup: optional callback issued once the GPIOs are valid
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* @teardown: optional callback issued before the GPIOs are invalidated
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* @context: optional parameter passed to setup() and teardown()
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*
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* In addition to the I2C_BOARD_INFO() state appropriate to each chip,
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* the i2c_board_info used with the pcf875x driver must provide the
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* chip "type" ("pcf8574", "pcf8574a", "pcf8575", "pcf8575c") and its
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* platform_data (pointer to one of these structures) with at least
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* the gpio_base value initialized.
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*
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* The @setup callback may be used with the kind of board-specific glue
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* which hands the (now-valid) GPIOs to other drivers, or which puts
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* devices in their initial states using these GPIOs.
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*
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* These GPIO chips are only "quasi-bidirectional"; read the chip specs
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* to understand the behavior. They don't have separate registers to
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* record which pins are used for input or output, record which output
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* values are driven, or provide access to input values. That must be
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* inferred by reading the chip's value and knowing the last value written
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* to it. If you leave n_latch initialized to zero, that last written
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* value is presumed to be all ones (as if the chip were just reset).
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*/
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struct pcf857x_platform_data {
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unsigned gpio_base;
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unsigned n_latch;
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int (*setup)(struct i2c_client *client,
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int gpio, unsigned ngpio,
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void *context);
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int (*teardown)(struct i2c_client *client,
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int gpio, unsigned ngpio,
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void *context);
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void *context;
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};
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#endif /* __LINUX_PCF857X_H */
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