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Diffstat (limited to 'include/linux/i2c/pcf857x.h')
-rw-r--r--include/linux/i2c/pcf857x.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/include/linux/i2c/pcf857x.h b/include/linux/i2c/pcf857x.h
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+++ b/include/linux/i2c/pcf857x.h
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+#ifndef __LINUX_PCF857X_H
+#define __LINUX_PCF857X_H
+
+/**
+ * struct pcf857x_platform_data - data to set up pcf857x driver
+ * @gpio_base: number of the chip's first GPIO
+ * @n_latch: optional bit-inverse of initial register value; if
+ * you leave this initialized to zero the driver will act
+ * like the chip was just reset
+ * @setup: optional callback issued once the GPIOs are valid
+ * @teardown: optional callback issued before the GPIOs are invalidated
+ * @context: optional parameter passed to setup() and teardown()
+ *
+ * In addition to the I2C_BOARD_INFO() state appropriate to each chip,
+ * the i2c_board_info used with the pcf875x driver must provide the
+ * chip "type" ("pcf8574", "pcf8574a", "pcf8575", "pcf8575c") and its
+ * platform_data (pointer to one of these structures) with at least
+ * the gpio_base value initialized.
+ *
+ * The @setup callback may be used with the kind of board-specific glue
+ * which hands the (now-valid) GPIOs to other drivers, or which puts
+ * devices in their initial states using these GPIOs.
+ *
+ * These GPIO chips are only "quasi-bidirectional"; read the chip specs
+ * to understand the behavior. They don't have separate registers to
+ * record which pins are used for input or output, record which output
+ * values are driven, or provide access to input values. That must be
+ * inferred by reading the chip's value and knowing the last value written
+ * to it. If you leave n_latch initialized to zero, that last written
+ * value is presumed to be all ones (as if the chip were just reset).
+ */
+struct pcf857x_platform_data {
+ unsigned gpio_base;
+ unsigned n_latch;
+
+ int (*setup)(struct i2c_client *client,
+ int gpio, unsigned ngpio,
+ void *context);
+ int (*teardown)(struct i2c_client *client,
+ int gpio, unsigned ngpio,
+ void *context);
+ void *context;
+};
+
+#endif /* __LINUX_PCF857X_H */