openwrtv3/target/linux/ar71xx/files/drivers/gpio/gpio-nxp-74hc153.c
Gabor Juhos 7a4930b27c ar71xx: remove obsolete '< KERNEL_VERSION(3, 15, 0)' checks
Because the oldest supported kernel version on the ar71xx target is 4.4,
the condition that the kernel version is smaller than 3.15.0 is always
false. Remove the obsolete checks from the target specific source files
to clean up the code a bit.

Signed-off-by: Gabor Juhos <juhosg@freemail.hu>
2018-01-09 21:33:18 +01:00

243 lines
5.7 KiB
C

/*
* NXP 74HC153 - Dual 4-input multiplexer GPIO driver
*
* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/nxp_74hc153.h>
#define NXP_74HC153_NUM_GPIOS 8
#define NXP_74HC153_S0_MASK 0x1
#define NXP_74HC153_S1_MASK 0x2
#define NXP_74HC153_BANK_MASK 0x4
struct nxp_74hc153_chip {
struct device *parent;
struct gpio_chip gpio_chip;
struct mutex lock;
};
static struct nxp_74hc153_chip *gpio_to_nxp(struct gpio_chip *gc)
{
return container_of(gc, struct nxp_74hc153_chip, gpio_chip);
}
static int nxp_74hc153_direction_input(struct gpio_chip *gc, unsigned offset)
{
return 0;
}
static int nxp_74hc153_direction_output(struct gpio_chip *gc,
unsigned offset, int val)
{
return -EINVAL;
}
static int nxp_74hc153_get_value(struct gpio_chip *gc, unsigned offset)
{
struct nxp_74hc153_chip *nxp;
struct nxp_74hc153_platform_data *pdata;
unsigned s0;
unsigned s1;
unsigned pin;
int ret;
nxp = gpio_to_nxp(gc);
pdata = nxp->parent->platform_data;
s0 = !!(offset & NXP_74HC153_S0_MASK);
s1 = !!(offset & NXP_74HC153_S1_MASK);
pin = (offset & NXP_74HC153_BANK_MASK) ? pdata->gpio_pin_2y
: pdata->gpio_pin_1y;
mutex_lock(&nxp->lock);
gpio_set_value(pdata->gpio_pin_s0, s0);
gpio_set_value(pdata->gpio_pin_s1, s1);
ret = gpio_get_value(pin);
mutex_unlock(&nxp->lock);
return ret;
}
static void nxp_74hc153_set_value(struct gpio_chip *gc,
unsigned offset, int val)
{
/* not supported */
}
static int nxp_74hc153_probe(struct platform_device *pdev)
{
struct nxp_74hc153_platform_data *pdata;
struct nxp_74hc153_chip *nxp;
struct gpio_chip *gc;
int err;
pdata = pdev->dev.platform_data;
if (pdata == NULL) {
dev_dbg(&pdev->dev, "no platform data specified\n");
return -EINVAL;
}
nxp = kzalloc(sizeof(struct nxp_74hc153_chip), GFP_KERNEL);
if (nxp == NULL) {
dev_err(&pdev->dev, "no memory for private data\n");
return -ENOMEM;
}
err = gpio_request(pdata->gpio_pin_s0, dev_name(&pdev->dev));
if (err) {
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
pdata->gpio_pin_s0, err);
goto err_free_nxp;
}
err = gpio_request(pdata->gpio_pin_s1, dev_name(&pdev->dev));
if (err) {
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
pdata->gpio_pin_s1, err);
goto err_free_s0;
}
err = gpio_request(pdata->gpio_pin_1y, dev_name(&pdev->dev));
if (err) {
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
pdata->gpio_pin_1y, err);
goto err_free_s1;
}
err = gpio_request(pdata->gpio_pin_2y, dev_name(&pdev->dev));
if (err) {
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
pdata->gpio_pin_2y, err);
goto err_free_1y;
}
err = gpio_direction_output(pdata->gpio_pin_s0, 0);
if (err) {
dev_err(&pdev->dev,
"unable to set direction of gpio %u, err=%d\n",
pdata->gpio_pin_s0, err);
goto err_free_2y;
}
err = gpio_direction_output(pdata->gpio_pin_s1, 0);
if (err) {
dev_err(&pdev->dev,
"unable to set direction of gpio %u, err=%d\n",
pdata->gpio_pin_s1, err);
goto err_free_2y;
}
err = gpio_direction_input(pdata->gpio_pin_1y);
if (err) {
dev_err(&pdev->dev,
"unable to set direction of gpio %u, err=%d\n",
pdata->gpio_pin_1y, err);
goto err_free_2y;
}
err = gpio_direction_input(pdata->gpio_pin_2y);
if (err) {
dev_err(&pdev->dev,
"unable to set direction of gpio %u, err=%d\n",
pdata->gpio_pin_2y, err);
goto err_free_2y;
}
nxp->parent = &pdev->dev;
mutex_init(&nxp->lock);
gc = &nxp->gpio_chip;
gc->direction_input = nxp_74hc153_direction_input;
gc->direction_output = nxp_74hc153_direction_output;
gc->get = nxp_74hc153_get_value;
gc->set = nxp_74hc153_set_value;
gc->can_sleep = 1;
gc->base = pdata->gpio_base;
gc->ngpio = NXP_74HC153_NUM_GPIOS;
gc->label = dev_name(nxp->parent);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
gc->dev = nxp->parent;
#else
gc->parent = nxp->parent;
#endif
gc->owner = THIS_MODULE;
err = gpiochip_add(&nxp->gpio_chip);
if (err) {
dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err);
goto err_free_2y;
}
platform_set_drvdata(pdev, nxp);
return 0;
err_free_2y:
gpio_free(pdata->gpio_pin_2y);
err_free_1y:
gpio_free(pdata->gpio_pin_1y);
err_free_s1:
gpio_free(pdata->gpio_pin_s1);
err_free_s0:
gpio_free(pdata->gpio_pin_s0);
err_free_nxp:
kfree(nxp);
return err;
}
static int nxp_74hc153_remove(struct platform_device *pdev)
{
struct nxp_74hc153_chip *nxp = platform_get_drvdata(pdev);
struct nxp_74hc153_platform_data *pdata = pdev->dev.platform_data;
if (nxp) {
gpiochip_remove(&nxp->gpio_chip);
gpio_free(pdata->gpio_pin_2y);
gpio_free(pdata->gpio_pin_1y);
gpio_free(pdata->gpio_pin_s1);
gpio_free(pdata->gpio_pin_s0);
kfree(nxp);
platform_set_drvdata(pdev, NULL);
}
return 0;
}
static struct platform_driver nxp_74hc153_driver = {
.probe = nxp_74hc153_probe,
.remove = nxp_74hc153_remove,
.driver = {
.name = NXP_74HC153_DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int __init nxp_74hc153_init(void)
{
return platform_driver_register(&nxp_74hc153_driver);
}
subsys_initcall(nxp_74hc153_init);
static void __exit nxp_74hc153_exit(void)
{
platform_driver_unregister(&nxp_74hc153_driver);
}
module_exit(nxp_74hc153_exit);
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC153");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" NXP_74HC153_DRIVER_NAME);