+++ /dev/null
-/*
- * 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/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 __devinit 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);
- gc->dev = nxp->parent;
- 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) {
- int err;
-
- err = gpiochip_remove(&nxp->gpio_chip);
- if (err) {
- dev_err(&pdev->dev,
- "unable to remove gpio chip, err=%d\n",
- err);
- return err;
- }
-
- 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 = __devexit_p(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);
projects / openwrt.git / blobdiff