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