mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-10-30 03:03:08 +02:00
4df4a3bfd5
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21192 3c298f89-4303-0410-b956-a3cf2f4a3e73
280 lines
6.9 KiB
Diff
280 lines
6.9 KiB
Diff
--- 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 */
|