--- /dev/null
+--- a/drivers/gpio/Kconfig
++++ b/drivers/gpio/Kconfig
+@@ -230,4 +230,12 @@ config GPIO_UCB1400
+ To compile this driver as a module, choose M here: the
+ module will be called ucb1400_gpio.
+
++comment "Other GPIO expanders"
++
++config GPIO_NXP_74HC164
++ tristate "NXP 74HC164 Output expanders"
++ help
++ Platform driver for NXP 74HC164 8-output Expanders. This
++ provides a GPIO interface supporting outputs.
++
+ endif
+--- a/drivers/gpio/Makefile
++++ b/drivers/gpio/Makefile
+@@ -10,6 +10,7 @@ obj-$(CONFIG_GPIO_MAX7301) += max7301.o
+ obj-$(CONFIG_GPIO_MAX732X) += max732x.o
+ obj-$(CONFIG_GPIO_MC33880) += mc33880.o
+ obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
++obj-$(CONFIG_GPIO_NXP_74HC164) += nxp_74hc164.o
+ obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
+ obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
+ obj-$(CONFIG_GPIO_PL061) += pl061.o
+--- /dev/null
++++ b/drivers/gpio/nxp_74hc164.c
+@@ -0,0 +1,226 @@
++/*
++ * NXP 74HC164 - output expander GPIO driver
++ *
++ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
++ * Copyright (C) 2010 Miguel Gaio <miguel.gaio@efixo.com>
++ *
++ * 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.
++ *
++ * Copy from nxp_74hc153.c code
++ */
++
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/gpio.h>
++#include <linux/bitops.h>
++#include <linux/platform_device.h>
++#include <linux/nxp_74hc164.h>
++
++#define NXP_74HC164_NUM_GPIOS 8
++
++struct nxp_74hc164_chip {
++ struct device *parent;
++ struct gpio_chip gpio_chip;
++ struct mutex lock;
++ long mask;
++};
++
++static void nxp_74hc164_set_value(struct gpio_chip *, unsigned, int);
++
++static struct nxp_74hc164_chip *gpio_to_nxp(struct gpio_chip *gc)
++{
++ return container_of(gc, struct nxp_74hc164_chip, gpio_chip);
++}
++
++static int nxp_74hc164_direction_input(struct gpio_chip *gc, unsigned offset)
++{
++ WARN_ON(1);
++ return -EINVAL;
++}
++
++static int nxp_74hc164_direction_output(struct gpio_chip *gc,
++ unsigned offset, int val)
++{
++ nxp_74hc164_set_value(gc, offset, val);
++ return 0;
++}
++
++static int nxp_74hc164_get_value(struct gpio_chip *gc, unsigned offset)
++{
++ struct nxp_74hc164_chip *nxp = gpio_to_nxp(gc);
++ int ret;
++
++ mutex_lock(&nxp->lock);
++ ret = test_bit(offset, &nxp->mask);
++ mutex_unlock(&nxp->lock);
++
++ return ret;
++}
++
++static void nxp_74hc164_set_value(struct gpio_chip *gc,
++ unsigned offset, int val)
++{
++ struct nxp_74hc164_chip *nxp;
++ struct nxp_74hc164_platform_data *pdata;
++ long mask;
++ int refresh;
++ int i;
++
++ nxp = gpio_to_nxp(gc);
++ pdata = nxp->parent->platform_data;
++
++ mutex_lock(&nxp->lock);
++ if (val)
++ refresh = (test_and_set_bit(offset, &nxp->mask) != val);
++ else
++ refresh = (test_and_clear_bit(offset, &nxp->mask) != val);
++
++ if (refresh) {
++ mask = nxp->mask;
++ for (i = 8; i > 0; --i, mask <<= 1) {
++ gpio_set_value(pdata->gpio_pin_data, mask & 0x80);
++ gpio_set_value(pdata->gpio_pin_clk, 1);
++ gpio_set_value(pdata->gpio_pin_clk, 0);
++ }
++ }
++ mutex_unlock(&nxp->lock);
++}
++
++static int __devinit nxp_74hc164_probe(struct platform_device *pdev)
++{
++ struct nxp_74hc164_platform_data *pdata;
++ struct nxp_74hc164_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_74hc164_chip), GFP_KERNEL);
++ if (nxp == NULL) {
++ dev_err(&pdev->dev, "no memory for private data\n");
++ return -ENOMEM;
++ }
++
++ err = gpio_request(pdata->gpio_pin_clk, dev_name(&pdev->dev));
++ if (err) {
++ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
++ pdata->gpio_pin_clk, err);
++ goto err_free_nxp;
++ }
++
++ err = gpio_request(pdata->gpio_pin_data, dev_name(&pdev->dev));
++ if (err) {
++ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
++ pdata->gpio_pin_data, err);
++ goto err_free_clk;
++ }
++
++ err = gpio_direction_output(pdata->gpio_pin_clk, 0);
++ if (err) {
++ dev_err(&pdev->dev,
++ "unable to set direction of gpio %u, err=%d\n",
++ pdata->gpio_pin_clk, err);
++ goto err_free_data;
++ }
++
++ err = gpio_direction_output(pdata->gpio_pin_data, 0);
++ if (err) {
++ dev_err(&pdev->dev,
++ "unable to set direction of gpio %u, err=%d\n",
++ pdata->gpio_pin_data, err);
++ goto err_free_data;
++ }
++
++ nxp->parent = &pdev->dev;
++ mutex_init(&nxp->lock);
++
++ gc = &nxp->gpio_chip;
++
++ gc->direction_input = nxp_74hc164_direction_input;
++ gc->direction_output = nxp_74hc164_direction_output;
++ gc->get = nxp_74hc164_get_value;
++ gc->set = nxp_74hc164_set_value;
++ gc->can_sleep = 1;
++
++ gc->base = pdata->gpio_base;
++ gc->ngpio = NXP_74HC164_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_data;
++ }
++
++ platform_set_drvdata(pdev, nxp);
++ return 0;
++
++ err_free_data:
++ gpio_free(pdata->gpio_pin_data);
++ err_free_clk:
++ gpio_free(pdata->gpio_pin_clk);
++ err_free_nxp:
++ kfree(nxp);
++ return err;
++}
++
++static int nxp_74hc164_remove(struct platform_device *pdev)
++{
++ struct nxp_74hc164_chip *nxp = platform_get_drvdata(pdev);
++ struct nxp_74hc164_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_clk);
++ gpio_free(pdata->gpio_pin_data);
++
++ kfree(nxp);
++ platform_set_drvdata(pdev, NULL);
++ }
++
++ return 0;
++}
++
++static struct platform_driver nxp_74hc164_driver = {
++ .probe = nxp_74hc164_probe,
++ .remove = __devexit_p(nxp_74hc164_remove),
++ .driver = {
++ .name = NXP_74HC164_DRIVER_NAME,
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init nxp_74hc164_init(void)
++{
++ return platform_driver_register(&nxp_74hc164_driver);
++}
++subsys_initcall(nxp_74hc164_init);
++
++static void __exit nxp_74hc164_exit(void)
++{
++ platform_driver_unregister(&nxp_74hc164_driver);
++}
++module_exit(nxp_74hc164_exit);
++
++MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
++MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
++MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC164");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:" NXP_74HC164_DRIVER_NAME);
+--- /dev/null
++++ b/include/linux/nxp_74hc164.h
+@@ -0,0 +1,22 @@
++/*
++ * NXP 74HC164 - Dual 4-input multiplexer defines
++ *
++ * 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.
++ */
++
++#ifndef _NXP_74HC164_H
++#define _NXP_74HC164_H
++
++#define NXP_74HC164_DRIVER_NAME "nxp-74hc164"
++
++struct nxp_74hc164_platform_data {
++ unsigned gpio_base;
++ unsigned gpio_pin_data;
++ unsigned gpio_pin_clk;
++};
++
++#endif /* _NXP_74HC164_H */
--- /dev/null
+--- a/drivers/gpio/Kconfig
++++ b/drivers/gpio/Kconfig
+@@ -255,4 +255,12 @@ config GPIO_UCB1400
+ To compile this driver as a module, choose M here: the
+ module will be called ucb1400_gpio.
+
++comment "Other GPIO expanders"
++
++config GPIO_NXP_74HC164
++ tristate "NXP 74HC164 Output expanders"
++ help
++ Platform driver for NXP 74HC164 8-output Expanders. This
++ provides a GPIO interface supporting outputs.
++
+ endif
+--- a/drivers/gpio/Makefile
++++ b/drivers/gpio/Makefile
+@@ -11,6 +11,7 @@ obj-$(CONFIG_GPIO_MAX7301) += max7301.o
+ obj-$(CONFIG_GPIO_MAX732X) += max732x.o
+ obj-$(CONFIG_GPIO_MC33880) += mc33880.o
+ obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
++obj-$(CONFIG_GPIO_NXP_74HC164) += nxp_74hc164.o
+ obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
+ obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
+ obj-$(CONFIG_GPIO_PL061) += pl061.o
+--- /dev/null
++++ b/drivers/gpio/nxp_74hc164.c
+@@ -0,0 +1,226 @@
++/*
++ * NXP 74HC164 - output expander GPIO driver
++ *
++ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
++ * Copyright (C) 2010 Miguel Gaio <miguel.gaio@efixo.com>
++ *
++ * 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.
++ *
++ * Copy from nxp_74hc153.c code
++ */
++
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/gpio.h>
++#include <linux/bitops.h>
++#include <linux/platform_device.h>
++#include <linux/nxp_74hc164.h>
++
++#define NXP_74HC164_NUM_GPIOS 8
++
++struct nxp_74hc164_chip {
++ struct device *parent;
++ struct gpio_chip gpio_chip;
++ struct mutex lock;
++ long mask;
++};
++
++static void nxp_74hc164_set_value(struct gpio_chip *, unsigned, int);
++
++static struct nxp_74hc164_chip *gpio_to_nxp(struct gpio_chip *gc)
++{
++ return container_of(gc, struct nxp_74hc164_chip, gpio_chip);
++}
++
++static int nxp_74hc164_direction_input(struct gpio_chip *gc, unsigned offset)
++{
++ WARN_ON(1);
++ return -EINVAL;
++}
++
++static int nxp_74hc164_direction_output(struct gpio_chip *gc,
++ unsigned offset, int val)
++{
++ nxp_74hc164_set_value(gc, offset, val);
++ return 0;
++}
++
++static int nxp_74hc164_get_value(struct gpio_chip *gc, unsigned offset)
++{
++ struct nxp_74hc164_chip *nxp = gpio_to_nxp(gc);
++ int ret;
++
++ mutex_lock(&nxp->lock);
++ ret = test_bit(offset, &nxp->mask);
++ mutex_unlock(&nxp->lock);
++
++ return ret;
++}
++
++static void nxp_74hc164_set_value(struct gpio_chip *gc,
++ unsigned offset, int val)
++{
++ struct nxp_74hc164_chip *nxp;
++ struct nxp_74hc164_platform_data *pdata;
++ long mask;
++ int refresh;
++ int i;
++
++ nxp = gpio_to_nxp(gc);
++ pdata = nxp->parent->platform_data;
++
++ mutex_lock(&nxp->lock);
++ if (val)
++ refresh = (test_and_set_bit(offset, &nxp->mask) != val);
++ else
++ refresh = (test_and_clear_bit(offset, &nxp->mask) != val);
++
++ if (refresh) {
++ mask = nxp->mask;
++ for (i = 8; i > 0; --i, mask <<= 1) {
++ gpio_set_value(pdata->gpio_pin_data, mask & 0x80);
++ gpio_set_value(pdata->gpio_pin_clk, 1);
++ gpio_set_value(pdata->gpio_pin_clk, 0);
++ }
++ }
++ mutex_unlock(&nxp->lock);
++}
++
++static int __devinit nxp_74hc164_probe(struct platform_device *pdev)
++{
++ struct nxp_74hc164_platform_data *pdata;
++ struct nxp_74hc164_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_74hc164_chip), GFP_KERNEL);
++ if (nxp == NULL) {
++ dev_err(&pdev->dev, "no memory for private data\n");
++ return -ENOMEM;
++ }
++
++ err = gpio_request(pdata->gpio_pin_clk, dev_name(&pdev->dev));
++ if (err) {
++ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
++ pdata->gpio_pin_clk, err);
++ goto err_free_nxp;
++ }
++
++ err = gpio_request(pdata->gpio_pin_data, dev_name(&pdev->dev));
++ if (err) {
++ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
++ pdata->gpio_pin_data, err);
++ goto err_free_clk;
++ }
++
++ err = gpio_direction_output(pdata->gpio_pin_clk, 0);
++ if (err) {
++ dev_err(&pdev->dev,
++ "unable to set direction of gpio %u, err=%d\n",
++ pdata->gpio_pin_clk, err);
++ goto err_free_data;
++ }
++
++ err = gpio_direction_output(pdata->gpio_pin_data, 0);
++ if (err) {
++ dev_err(&pdev->dev,
++ "unable to set direction of gpio %u, err=%d\n",
++ pdata->gpio_pin_data, err);
++ goto err_free_data;
++ }
++
++ nxp->parent = &pdev->dev;
++ mutex_init(&nxp->lock);
++
++ gc = &nxp->gpio_chip;
++
++ gc->direction_input = nxp_74hc164_direction_input;
++ gc->direction_output = nxp_74hc164_direction_output;
++ gc->get = nxp_74hc164_get_value;
++ gc->set = nxp_74hc164_set_value;
++ gc->can_sleep = 1;
++
++ gc->base = pdata->gpio_base;
++ gc->ngpio = NXP_74HC164_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_data;
++ }
++
++ platform_set_drvdata(pdev, nxp);
++ return 0;
++
++ err_free_data:
++ gpio_free(pdata->gpio_pin_data);
++ err_free_clk:
++ gpio_free(pdata->gpio_pin_clk);
++ err_free_nxp:
++ kfree(nxp);
++ return err;
++}
++
++static int nxp_74hc164_remove(struct platform_device *pdev)
++{
++ struct nxp_74hc164_chip *nxp = platform_get_drvdata(pdev);
++ struct nxp_74hc164_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_clk);
++ gpio_free(pdata->gpio_pin_data);
++
++ kfree(nxp);
++ platform_set_drvdata(pdev, NULL);
++ }
++
++ return 0;
++}
++
++static struct platform_driver nxp_74hc164_driver = {
++ .probe = nxp_74hc164_probe,
++ .remove = __devexit_p(nxp_74hc164_remove),
++ .driver = {
++ .name = NXP_74HC164_DRIVER_NAME,
++ .owner = THIS_MODULE,
++ },
++};
++
++static int __init nxp_74hc164_init(void)
++{
++ return platform_driver_register(&nxp_74hc164_driver);
++}
++subsys_initcall(nxp_74hc164_init);
++
++static void __exit nxp_74hc164_exit(void)
++{
++ platform_driver_unregister(&nxp_74hc164_driver);
++}
++module_exit(nxp_74hc164_exit);
++
++MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
++MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
++MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC164");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:" NXP_74HC164_DRIVER_NAME);
+--- /dev/null
++++ b/include/linux/nxp_74hc164.h
+@@ -0,0 +1,22 @@
++/*
++ * NXP 74HC164 - Dual 4-input multiplexer defines
++ *
++ * 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.
++ */
++
++#ifndef _NXP_74HC164_H
++#define _NXP_74HC164_H
++
++#define NXP_74HC164_DRIVER_NAME "nxp-74hc164"
++
++struct nxp_74hc164_platform_data {
++ unsigned gpio_base;
++ unsigned gpio_pin_data;
++ unsigned gpio_pin_clk;
++};
++
++#endif /* _NXP_74HC164_H */
projects / openwrt.git / commitdiff