mirror of
https://github.com/openwrt/openwrt.git
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280 lines
6.9 KiB
Diff
280 lines
6.9 KiB
Diff
--- a/drivers/gpio/Kconfig
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+++ b/drivers/gpio/Kconfig
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@@ -230,4 +230,12 @@ config GPIO_UCB1400
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To compile this driver as a module, choose M here: the
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module will be called ucb1400_gpio.
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+comment "Other GPIO expanders"
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+
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+config GPIO_NXP_74HC164
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+ tristate "NXP 74HC164 Output expanders"
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+ help
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+ Platform driver for NXP 74HC164 8-output Expanders. This
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+ provides a GPIO interface supporting outputs.
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+
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endif
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--- a/drivers/gpio/Makefile
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+++ b/drivers/gpio/Makefile
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@@ -10,6 +10,7 @@ obj-$(CONFIG_GPIO_MAX7301) += max7301.o
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obj-$(CONFIG_GPIO_MAX732X) += max732x.o
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obj-$(CONFIG_GPIO_MC33880) += mc33880.o
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obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
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+obj-$(CONFIG_GPIO_NXP_74HC164) += nxp_74hc164.o
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obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
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obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
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obj-$(CONFIG_GPIO_PL061) += pl061.o
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--- /dev/null
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+++ b/drivers/gpio/nxp_74hc164.c
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@@ -0,0 +1,226 @@
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+/*
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+ * NXP 74HC164 - output expander GPIO driver
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+ *
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+ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
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+ * Copyright (C) 2010 Miguel Gaio <miguel.gaio@efixo.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * Copy from nxp_74hc153.c code
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/init.h>
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+#include <linux/gpio.h>
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+#include <linux/bitops.h>
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+#include <linux/platform_device.h>
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+#include <linux/nxp_74hc164.h>
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+
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+#define NXP_74HC164_NUM_GPIOS 8
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+
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+struct nxp_74hc164_chip {
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+ struct device *parent;
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+ struct gpio_chip gpio_chip;
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+ struct mutex lock;
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+ long mask;
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+};
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+
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+static void nxp_74hc164_set_value(struct gpio_chip *, unsigned, int);
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+
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+static struct nxp_74hc164_chip *gpio_to_nxp(struct gpio_chip *gc)
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+{
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+ return container_of(gc, struct nxp_74hc164_chip, gpio_chip);
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+}
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+
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+static int nxp_74hc164_direction_input(struct gpio_chip *gc, unsigned offset)
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+{
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+ WARN_ON(1);
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+ return -EINVAL;
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+}
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+
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+static int nxp_74hc164_direction_output(struct gpio_chip *gc,
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+ unsigned offset, int val)
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+{
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+ nxp_74hc164_set_value(gc, offset, val);
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+ return 0;
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+}
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+
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+static int nxp_74hc164_get_value(struct gpio_chip *gc, unsigned offset)
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+{
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+ struct nxp_74hc164_chip *nxp = gpio_to_nxp(gc);
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+ int ret;
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+
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+ mutex_lock(&nxp->lock);
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+ ret = test_bit(offset, &nxp->mask);
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+ mutex_unlock(&nxp->lock);
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+
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+ return ret;
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+}
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+
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+static void nxp_74hc164_set_value(struct gpio_chip *gc,
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+ unsigned offset, int val)
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+{
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+ struct nxp_74hc164_chip *nxp;
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+ struct nxp_74hc164_platform_data *pdata;
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+ long mask;
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+ int refresh;
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+ int i;
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+
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+ nxp = gpio_to_nxp(gc);
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+ pdata = nxp->parent->platform_data;
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+
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+ mutex_lock(&nxp->lock);
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+ if (val)
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+ refresh = (test_and_set_bit(offset, &nxp->mask) != val);
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+ else
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+ refresh = (test_and_clear_bit(offset, &nxp->mask) != val);
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+
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+ if (refresh) {
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+ mask = nxp->mask;
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+ for (i = 8; i > 0; --i, mask <<= 1) {
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+ gpio_set_value(pdata->gpio_pin_data, mask & 0x80);
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+ gpio_set_value(pdata->gpio_pin_clk, 1);
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+ gpio_set_value(pdata->gpio_pin_clk, 0);
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+ }
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+ }
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+ mutex_unlock(&nxp->lock);
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+}
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+
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+static int __devinit nxp_74hc164_probe(struct platform_device *pdev)
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+{
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+ struct nxp_74hc164_platform_data *pdata;
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+ struct nxp_74hc164_chip *nxp;
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+ struct gpio_chip *gc;
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+ int err;
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+
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+ pdata = pdev->dev.platform_data;
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+ if (pdata == NULL) {
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+ dev_dbg(&pdev->dev, "no platform data specified\n");
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+ return -EINVAL;
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+ }
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+
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+ nxp = kzalloc(sizeof(struct nxp_74hc164_chip), GFP_KERNEL);
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+ if (nxp == NULL) {
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+ dev_err(&pdev->dev, "no memory for private data\n");
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+ return -ENOMEM;
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+ }
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+
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+ err = gpio_request(pdata->gpio_pin_clk, dev_name(&pdev->dev));
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+ if (err) {
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+ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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+ pdata->gpio_pin_clk, err);
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+ goto err_free_nxp;
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+ }
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+
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+ err = gpio_request(pdata->gpio_pin_data, dev_name(&pdev->dev));
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+ if (err) {
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+ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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+ pdata->gpio_pin_data, err);
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+ goto err_free_clk;
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+ }
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+
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+ err = gpio_direction_output(pdata->gpio_pin_clk, 0);
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+ if (err) {
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+ dev_err(&pdev->dev,
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+ "unable to set direction of gpio %u, err=%d\n",
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+ pdata->gpio_pin_clk, err);
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+ goto err_free_data;
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+ }
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+
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+ err = gpio_direction_output(pdata->gpio_pin_data, 0);
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+ if (err) {
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+ dev_err(&pdev->dev,
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+ "unable to set direction of gpio %u, err=%d\n",
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+ pdata->gpio_pin_data, err);
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+ goto err_free_data;
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+ }
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+
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+ nxp->parent = &pdev->dev;
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+ mutex_init(&nxp->lock);
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+
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+ gc = &nxp->gpio_chip;
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+
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+ gc->direction_input = nxp_74hc164_direction_input;
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+ gc->direction_output = nxp_74hc164_direction_output;
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+ gc->get = nxp_74hc164_get_value;
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+ gc->set = nxp_74hc164_set_value;
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+ gc->can_sleep = 1;
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+
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+ gc->base = pdata->gpio_base;
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+ gc->ngpio = NXP_74HC164_NUM_GPIOS;
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+ gc->label = dev_name(nxp->parent);
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+ gc->dev = nxp->parent;
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+ gc->owner = THIS_MODULE;
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+
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+ err = gpiochip_add(&nxp->gpio_chip);
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+ if (err) {
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+ dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err);
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+ goto err_free_data;
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+ }
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+
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+ platform_set_drvdata(pdev, nxp);
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+ return 0;
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+
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+ err_free_data:
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+ gpio_free(pdata->gpio_pin_data);
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+ err_free_clk:
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+ gpio_free(pdata->gpio_pin_clk);
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+ err_free_nxp:
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+ kfree(nxp);
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+ return err;
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+}
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+
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+static int nxp_74hc164_remove(struct platform_device *pdev)
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+{
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+ struct nxp_74hc164_chip *nxp = platform_get_drvdata(pdev);
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+ struct nxp_74hc164_platform_data *pdata = pdev->dev.platform_data;
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+
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+ if (nxp) {
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+ int err;
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+
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+ err = gpiochip_remove(&nxp->gpio_chip);
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+ if (err) {
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+ dev_err(&pdev->dev,
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+ "unable to remove gpio chip, err=%d\n",
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+ err);
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+ return err;
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+ }
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+
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+ gpio_free(pdata->gpio_pin_clk);
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+ gpio_free(pdata->gpio_pin_data);
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+
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+ kfree(nxp);
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+ platform_set_drvdata(pdev, NULL);
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+ }
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+
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+ return 0;
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+}
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+
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+static struct platform_driver nxp_74hc164_driver = {
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+ .probe = nxp_74hc164_probe,
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+ .remove = __devexit_p(nxp_74hc164_remove),
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+ .driver = {
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+ .name = NXP_74HC164_DRIVER_NAME,
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init nxp_74hc164_init(void)
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+{
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+ return platform_driver_register(&nxp_74hc164_driver);
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+}
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+subsys_initcall(nxp_74hc164_init);
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+
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+static void __exit nxp_74hc164_exit(void)
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+{
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+ platform_driver_unregister(&nxp_74hc164_driver);
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+}
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+module_exit(nxp_74hc164_exit);
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+
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+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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+MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
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+MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC164");
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+MODULE_LICENSE("GPL v2");
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+MODULE_ALIAS("platform:" NXP_74HC164_DRIVER_NAME);
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--- /dev/null
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+++ b/include/linux/nxp_74hc164.h
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@@ -0,0 +1,22 @@
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+/*
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+ * NXP 74HC164 - Dual 4-input multiplexer defines
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+ *
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+ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#ifndef _NXP_74HC164_H
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+#define _NXP_74HC164_H
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+
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+#define NXP_74HC164_DRIVER_NAME "nxp-74hc164"
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+
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+struct nxp_74hc164_platform_data {
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+ unsigned gpio_base;
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+ unsigned gpio_pin_data;
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+ unsigned gpio_pin_clk;
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+};
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+
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+#endif /* _NXP_74HC164_H */
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