mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 17:21:30 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23623 3c298f89-4303-0410-b956-a3cf2f4a3e73
459 lines
11 KiB
Diff
459 lines
11 KiB
Diff
--- a/drivers/gpio/Kconfig
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+++ b/drivers/gpio/Kconfig
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@@ -321,6 +321,14 @@ config GPIO_MC33880
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SPI driver for Freescale MC33880 high-side/low-side switch.
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This provides GPIO interface supporting inputs and outputs.
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+config GPIO_74X164
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+ tristate "74x164 serial-in/parallel-out 8-bits shift register"
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+ depends on SPI_MASTER
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+ help
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+ Platform driver for 74x164 compatible serial-in/parallel-out
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+ 8-outputs shift registers. This driver can be used to provide access
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+ to more gpio outputs.
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+
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comment "AC97 GPIO expanders:"
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config GPIO_UCB1400
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--- a/drivers/gpio/Makefile
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+++ b/drivers/gpio/Makefile
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@@ -17,6 +17,7 @@ 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-$(CONFIG_GPIO_74X164) += 74x164.o
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obj-$(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 +1,227 @@
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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/slab.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/drivers/gpio/74x164.c
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@@ -0,0 +1,184 @@
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+/*
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+ * 74Hx164 - Generic serial-in/parallel-out 8-bits shift register 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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+
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+#include <linux/init.h>
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+#include <linux/mutex.h>
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+#include <linux/spi/spi.h>
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+#include <linux/spi/74x164.h>
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+#include <linux/gpio.h>
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+#include <linux/slab.h>
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+
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+#define GEN_74X164_GPIO_COUNT 8
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+
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+
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+struct gen_74x164_chip {
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+ struct spi_device *spi;
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+ struct gpio_chip gpio_chip;
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+ struct mutex lock;
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+ u8 port_config;
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+};
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+
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+static void gen_74x164_set_value(struct gpio_chip *, unsigned, int);
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+
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+static struct gen_74x164_chip *gpio_to_chip(struct gpio_chip *gc)
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+{
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+ return container_of(gc, struct gen_74x164_chip, gpio_chip);
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+}
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+
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+static int __gen_74x164_write_config(struct gen_74x164_chip *chip)
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+{
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+ return spi_write(chip->spi,
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+ &chip->port_config, sizeof(chip->port_config));
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+}
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+
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+static int gen_74x164_direction_output(struct gpio_chip *gc,
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+ unsigned offset, int val)
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+{
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+ gen_74x164_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 gen_74x164_get_value(struct gpio_chip *gc, unsigned offset)
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+{
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+ struct gen_74x164_chip *chip = gpio_to_chip(gc);
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+ int ret;
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+
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+ mutex_lock(&chip->lock);
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+ ret = (chip->port_config >> offset) & 0x1;
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+ mutex_unlock(&chip->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 gen_74x164_set_value(struct gpio_chip *gc,
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+ unsigned offset, int val)
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+{
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+ struct gen_74x164_chip *chip = gpio_to_chip(gc);
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+ bool refresh;
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+
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+ mutex_lock(&chip->lock);
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+ if (val)
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+ chip->port_config |= (1 << offset);
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+ else
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+ chip->port_config &= ~(1 << offset);
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+
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+ __gen_74x164_write_config(chip);
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+ mutex_unlock(&chip->lock);
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+}
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+
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+static int __devinit gen_74x164_probe(struct spi_device *spi)
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+{
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+ struct gen_74x164_chip *chip;
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+ struct gen_74x164_chip_platform_data *pdata;
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+ int ret;
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+
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+ pdata = spi->dev.platform_data;
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+ if (!pdata || !pdata->base) {
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+ dev_dbg(&spi->dev, "incorrect or missing platform data\n");
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+ return -EINVAL;
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+ }
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+
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+ /*
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+ * bits_per_word cannot be configured in platform data
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+ */
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+ spi->bits_per_word = 8;
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+
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+ ret = spi_setup(spi);
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+ if (ret < 0)
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+ return ret;
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+
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+ chip = kzalloc(sizeof(*chip), GFP_KERNEL);
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+ if (!chip)
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+ return -ENOMEM;
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+
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+ mutex_init(&chip->lock);
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+
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+ dev_set_drvdata(&spi->dev, chip);
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+
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+ chip->spi = spi;
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+
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+ chip->gpio_chip.label = GEN_74X164_DRIVER_NAME,
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+ chip->gpio_chip.direction_output = gen_74x164_direction_output;
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+ chip->gpio_chip.get = gen_74x164_get_value;
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+ chip->gpio_chip.set = gen_74x164_set_value;
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+ chip->gpio_chip.base = pdata->base;
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+ chip->gpio_chip.ngpio = GEN_74X164_GPIO_COUNT;
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+ chip->gpio_chip.can_sleep = 1;
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+ chip->gpio_chip.dev = &spi->dev;
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+ chip->gpio_chip.owner = THIS_MODULE;
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+
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+ ret = __gen_74x164_write_config(chip);
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+ if (ret) {
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+ dev_err(&spi->dev, "Failed writing: %d\n", ret);
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+ goto exit_destroy;
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+ }
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+
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+ ret = gpiochip_add(&chip->gpio_chip);
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+ if (ret)
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+ goto exit_destroy;
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+
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+ return ret;
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+
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+exit_destroy:
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+ dev_set_drvdata(&spi->dev, NULL);
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+ mutex_destroy(&chip->lock);
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+ kfree(chip);
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+ return ret;
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+}
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+
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+static int gen_74x164_remove(struct spi_device *spi)
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+{
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+ struct gen_74x164_chip *chip;
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+ int ret;
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+
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+ chip = dev_get_drvdata(&spi->dev);
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+ if (chip == NULL)
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+ return -ENODEV;
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+
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+ dev_set_drvdata(&spi->dev, NULL);
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+
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+ ret = gpiochip_remove(&chip->gpio_chip);
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+ if (!ret) {
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+ mutex_destroy(&chip->lock);
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+ kfree(chip);
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+ } else
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+ dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n",
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+ ret);
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+
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+ return ret;
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+}
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+
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+static struct spi_driver gen_74x164_driver = {
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+ .driver = {
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+ .name = GEN_74X164_DRIVER_NAME,
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+ .owner = THIS_MODULE,
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+ },
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+ .probe = gen_74x164_probe,
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+ .remove = __devexit_p(gen_74x164_remove),
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+};
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+
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+static int __init gen_74x164_init(void)
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+{
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+ return spi_register_driver(&gen_74x164_driver);
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+}
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+subsys_initcall(gen_74x164_init);
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+
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+static void __exit gen_74x164_exit(void)
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+{
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+ spi_unregister_driver(&gen_74x164_driver);
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+}
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+module_exit(gen_74x164_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 74X164 8-bits shift register");
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+MODULE_LICENSE("GPL v2");
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+
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--- /dev/null
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+++ b/include/linux/spi/74x164.h
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@@ -0,0 +1,11 @@
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+#ifndef LINUX_SPI_74X164_H
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+#define LINUX_SPI_74X164_H
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+
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+#define GEN_74X164_DRIVER_NAME "74x164"
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+
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+struct gen_74x164_chip_platform_data {
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+ /* number assigned to the first GPIO */
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+ unsigned base;
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+};
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+
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+#endif
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