/* platform data for the PCA9539 16-bit I/O expander driver */
struct pca953x_platform_data {
/* number of the first GPIO */
unsigned gpio_base;
/* initial polarity inversion setting */
uint16_t invert;
void *context; /* param to setup/teardown */
int (*setup)(struct i2c_client *client,
unsigned gpio, unsigned ngpio,
void *context);
int (*teardown)(struct i2c_client *client,
unsigned gpio, unsigned ngpio,
void *context);
};