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/*
* SuperH Pin Function Controller GPIO driver.
*
* Copyright (C) 2008 Magnus Damm
* Copyright (C) 2009 - 2012 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#define pr_fmt(fmt) "sh_pfc " KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
struct sh_pfc_chip {
struct sh_pfc *pfc;
struct gpio_chip gpio_chip;
};
static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc)
{
return container_of(gc, struct sh_pfc_chip, gpio_chip);
}
static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc)
{
return gpio_to_pfc_chip(gc)->pfc;
}
static int sh_gpio_request(struct gpio_chip *gc, unsigned offset)
{
return pinctrl_request_gpio(offset);
}
static void sh_gpio_free(struct gpio_chip *gc, unsigned offset)
{
pinctrl_free_gpio(offset);
}
static void sh_gpio_set_value(struct sh_pfc *pfc, unsigned gpio, int value)
{
struct pinmux_data_reg *dr = NULL;
int bit = 0;
if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
BUG();
else
sh_pfc_write_bit(dr, bit, value);
}
static int sh_gpio_get_value(struct sh_pfc *pfc, unsigned gpio)
{
struct pinmux_data_reg *dr = NULL;
int bit = 0;
if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0)
return -EINVAL;
return sh_pfc_read_bit(dr, bit);
}
static int sh_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
return pinctrl_gpio_direction_input(offset);
}
static int sh_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
int value)
{
sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
return pinctrl_gpio_direction_output(offset);
}
static int sh_gpio_get(struct gpio_chip *gc, unsigned offset)
{
return sh_gpio_get_value(gpio_to_pfc(gc), offset);
}
static void sh_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
{
sh_gpio_set_value(gpio_to_pfc(gc), offset, value);
}
static int sh_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
struct sh_pfc *pfc = gpio_to_pfc(gc);
pinmux_enum_t enum_id;
pinmux_enum_t *enum_ids;
int i, k, pos;
pos = 0;
enum_id = 0;
while (1) {
pos = sh_pfc_gpio_to_enum(pfc, offset, pos, &enum_id);
if (pos <= 0 || !enum_id)
break;
for (i = 0; i < pfc->gpio_irq_size; i++) {
enum_ids = pfc->gpio_irq[i].enum_ids;
for (k = 0; enum_ids[k]; k++) {
if (enum_ids[k] == enum_id)
return pfc->gpio_irq[i].irq;
}
}
}
return -ENOSYS;
}
static void sh_pfc_gpio_setup(struct sh_pfc_chip *chip)
{
struct sh_pfc *pfc = chip->pfc;
struct gpio_chip *gc = &chip->gpio_chip;
gc->request = sh_gpio_request;
gc->free = sh_gpio_free;
gc->direction_input = sh_gpio_direction_input;
gc->get = sh_gpio_get;
gc->direction_output = sh_gpio_direction_output;
gc->set = sh_gpio_set;
gc->to_irq = sh_gpio_to_irq;
WARN_ON(pfc->first_gpio != 0); /* needs testing */
gc->label = pfc->name;
gc->owner = THIS_MODULE;
gc->base = pfc->first_gpio;
gc->ngpio = (pfc->last_gpio - pfc->first_gpio) + 1;
}
int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
{
struct sh_pfc_chip *chip;
int ret;
chip = kzalloc(sizeof(struct sh_pfc_chip), GFP_KERNEL);
if (unlikely(!chip))
return -ENOMEM;
chip->pfc = pfc;
sh_pfc_gpio_setup(chip);
ret = gpiochip_add(&chip->gpio_chip);
if (unlikely(ret < 0))
kfree(chip);
pr_info("%s handling gpio %d -> %d\n",
pfc->name, pfc->first_gpio, pfc->last_gpio);
return ret;
}
EXPORT_SYMBOL_GPL(sh_pfc_register_gpiochip);
static int sh_pfc_gpio_match(struct gpio_chip *gc, void *data)
{
return !!strstr(gc->label, data);
}
static int __devinit sh_pfc_gpio_probe(struct platform_device *pdev)
{
struct sh_pfc_chip *chip;
struct gpio_chip *gc;
gc = gpiochip_find("_pfc", sh_pfc_gpio_match);
if (unlikely(!gc)) {
pr_err("Cant find gpio chip\n");
return -ENODEV;
}
chip = gpio_to_pfc_chip(gc);
platform_set_drvdata(pdev, chip);
pr_info("attaching to GPIO chip %s\n", chip->pfc->name);
return 0;
}
static int __devexit sh_pfc_gpio_remove(struct platform_device *pdev)
{
struct sh_pfc_chip *chip = platform_get_drvdata(pdev);
int ret;
ret = gpiochip_remove(&chip->gpio_chip);
if (unlikely(ret < 0))
return ret;
kfree(chip);
return 0;
}
static struct platform_driver sh_pfc_gpio_driver = {
.probe = sh_pfc_gpio_probe,
.remove = __devexit_p(sh_pfc_gpio_remove),
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
},
};
static struct platform_device sh_pfc_gpio_device = {
.name = KBUILD_MODNAME,
.id = -1,
};
static int __init sh_pfc_gpio_init(void)
{
int rc;
rc = platform_driver_register(&sh_pfc_gpio_driver);
if (likely(!rc)) {
rc = platform_device_register(&sh_pfc_gpio_device);
if (unlikely(rc))
platform_driver_unregister(&sh_pfc_gpio_driver);
}
return rc;
}
static void __exit sh_pfc_gpio_exit(void)
{
platform_device_unregister(&sh_pfc_gpio_device);
platform_driver_unregister(&sh_pfc_gpio_driver);
}
module_init(sh_pfc_gpio_init);
module_exit(sh_pfc_gpio_exit);
MODULE_AUTHOR("Magnus Damm, Paul Mundt");
MODULE_DESCRIPTION("GPIO driver for SuperH pin function controller");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:pfc-gpio");
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