add NXP 74HC164 chip driver support, thx Miguel & Florian

SVN-Revision: 21192

1 files changed, 279 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/patches-2.6.32/211-nxp-74hc164-gpio-chip-driver.patch b/target/linux/brcm63xx/patches-2.6.32/211-nxp-74hc164-gpio-chip-driver.patch
new file mode 100644
index 0000000000..8e50ee740d
--- /dev/null
+++ b/target/linux/brcm63xx/patches-2.6.32/211-nxp-74hc164-gpio-chip-driver.patch
@@ -0,0 +1,279 @@
+--- 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 */