greybus: gpio driver

obj-m += greybus.o

obj-m += i2c-gb.o

obj-m += sdio-gb.o

obj-m += gpio-gb.o

KERNELVER		?= $(shell uname -r)

KERNELDIR 		?= /lib/modules/$(KERNELVER)/build

/*

 * GPIO Greybus driver.

 *

 * Copyright 2014 Google Inc.

 *

 * Released under the GPLv2 only.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/gpio.h>

#include "greybus.h"

struct gb_gpio {

	struct gpio_chip chip;

	struct greybus_device *gdev;

	// FIXME - some lock?

};

static const struct greybus_device_id id_table[] = {

	{ GREYBUS_DEVICE(0x44, 0x44) },	/* make shit up */

	{ },	/* terminating NULL entry */

};

static int direction_input(struct gpio_chip *gpio, unsigned nr)

{

	struct gp_gpio *gp_gpio = container_of(gpio, struct gp_gpio, chip);

	// FIXME - do something there

	return 0;

}

static int direction_output(struct gpio_chip *gpio, unsigned nr, int val)

{

	// FIXME - do something there

	return 0;

}

static int gpio_get(struct gpio_chip *gpio, unsigned nr)

{

	// FIXME - do something there

	return 0;

}

static int gpio_set(struct gpio_chip *gpio, unsigned nr, int val)

{

	// FIXME - do something there

	return 0;

}

static int gpio_gb_probe(struct greybus_device *gdev, const struct greybus_device_id *id)

{

	struct gp_gpio *gp_gpio;

	struct gpio_chip *gpio;

	struct device *dev = &gdev->dev;

	gp_gpio = devm_kzalloc(dev, sizeof(*gp_gpio), GFP_KERNEL);

	if (!gp_gpio)

		return -ENOMEM;

	gp_gpio->gdev = gdev;

	gpio = &gp_gpio->gpio;

	gpio->label = "greybus_gpio";

	gpio->owner = THIS_MODULE;

	gpio->direction_input = direction_input;

	gpio->direction_output = direction_output;

	gpio->get = gpio_get;

	gpio->set = gpio_set;

	gpio->dbg_show = NULL;

	gpio->base = 0;			// FIXME!!!

	gpio->ngpio = 42;		// FIXME!!!

	gpio->can_sleep = false;	// FIXME!!!

	greybus_set_drvdata(gdev, gp_gpio);

	retval = gpio_chip_add(gpio);

	if (retval) {

		dev_err(dev, "Failed to register GPIO\n");

		return retval;

	}

	return 0;

}

static void gpio_gb_disconnect(struct greybus_device *gdev)

{

	struct mmc_host *mmc;

	struct sd_gb_host *host;

	host = greybus_get_drvdata(gdev);

	mmc = host->mmc;

	mmc_remove_host(mmc);

	mmc_free_host(mmc);

}

static struct greybus_driver gpio_gb_driver = {

	.probe =	gpio_gb_probe,

	.disconnect =	gpio_gb_disconnect,

	.id_table =	id_table,

};

module_greybus_driver(gpio_gb_driver);

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("Greybus GPIO driver");

MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");