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greybus: gpio driver

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This commit is contained in:
Greg Kroah-Hartman 2014-08-12 12:00:16 +08:00
parent d5d1903dcd
commit c16854c3bf
2 changed files with 109 additions and 0 deletions
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1
drivers/staging/greybus/Makefile
View File

@ -3,6 +3,7 @@ greybus-y := core.o gbuf.o
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

108
drivers/staging/greybus/gpio-gb.c Normal file
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@ -0,0 +1,108 @@
/*
* 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>");