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/*
* 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_device {
struct gpio_chip chip;
struct greybus_device *gdev;
struct gpio_chip *gpio;
// FIXME - some lock?
};
static const struct greybus_module_id id_table[] = {
{ GREYBUS_DEVICE(0x44, 0x44) }, /* make shit up */
{ }, /* terminating NULL entry */
};
static int direction_input(struct gpio_chip *gpio, unsigned nr)
{
//struct gb_gpio_device *gb_gpio_dev = container_of(gpio, struct gb_gpio_device, 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 void gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
{
// FIXME - do something there
}
int gb_gpio_probe(struct greybus_device *gdev,
const struct greybus_module_id *id)
{
struct gb_gpio_device *gb_gpio;
struct gpio_chip *gpio;
struct device *dev = &gdev->dev;
int retval;
gb_gpio = kzalloc(sizeof(*gb_gpio), GFP_KERNEL);
if (!gb_gpio)
return -ENOMEM;
gb_gpio->gdev = gdev;
gpio = &gb_gpio->chip;
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!!!
gdev->gb_gpio_dev = gb_gpio;
retval = gpiochip_add(gpio);
if (retval) {
dev_err(dev, "Failed to register GPIO\n");
return retval;
}
return 0;
}
void gb_gpio_disconnect(struct greybus_device *gdev)
{
struct gb_gpio_device *gb_gpio_dev;
int retval;
gb_gpio_dev = gdev->gb_gpio_dev;
retval = gpiochip_remove(&gb_gpio_dev->chip);
kfree(gb_gpio_dev);
}
#if 0
static struct greybus_driver gpio_gb_driver = {
.probe = gb_gpio_probe,
.disconnect = gb_gpio_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>");
#endif
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