#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>

#define IS_USE_STATIC_PLATFORM_DATA 0

struct CHIP {
	struct spi_device *spi;
};

#if IS_USE_STATIC_PLATFORM_DATA
struct CHIP_platform_data {
	int spi_ch;
};
#endif // IS_USE_STATIC_PLATFORM_DATA

static int CHIP_probe(struct spi_device *spi)
{
	struct CHIP			*chip;
#if IS_USE_STATIC_PLATFORM_DATA
	struct CHIP_platform_data	*pdata;

	/* assuming the driver requires board-specific data: */
	pdata = (struct CHIP_platform_data *)&spi->dev.platform_data;
	if (!pdata)
		return -ENODEV;
#endif // IS_USE_STATIC_PLATFORM_DATA

	/* get memory for driver's per-chip state */
	chip = kzalloc(sizeof *chip, GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	spi_set_drvdata(spi, chip);

	return 0;
}

int CHIP_remove(struct spi_device *spi)
{
	struct CHIP *chip = NULL;

	chip = (struct CHIP *)spi_get_drvdata(spi);

	kfree(chip);

	return 0;
}

static struct spi_driver CHIP_driver = {
	.driver = {
		.name	= "CHIP",
		.owner	= THIS_MODULE,
	},

	.probe		= CHIP_probe,
	.remove		= CHIP_remove,
};

module_spi_driver(CHIP_driver);