+++ /dev/null
---- a/drivers/gpio/Kconfig
-+++ b/drivers/gpio/Kconfig
-@@ -343,4 +343,12 @@ config GPIO_JANZ_TTL
- This driver provides support for driving the pins in output
- mode only. Input mode is not supported.
-
-+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
-@@ -17,6 +17,7 @@ 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 */
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