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authorFlorian Fainelli <florian@openwrt.org>2010-10-17 14:08:45 +0000
committerFlorian Fainelli <florian@openwrt.org>2010-10-17 14:08:45 +0000
commitb65e4949765cfbce7ca8c5609433ad066d6bbd12 (patch)
tree0405b49e55fa142b3523d180475821e96fd555f1 /target/linux
parentcd9b90235ce1eaa8c52796b428fadddd0144d018 (diff)
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add 74x164 SPI chip support
Signed-off-by: Miguel Gaio <miguel.gaio@efixo.com> SVN-Revision: 23499
Diffstat (limited to 'target/linux')
-rw-r--r--target/linux/brcm63xx/patches-2.6.35/211-gen-74x164-gpio-chip-driver.patch (renamed from target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch)226
1 files changed, 202 insertions, 24 deletions
diff --git a/target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch b/target/linux/brcm63xx/patches-2.6.35/211-gen-74x164-gpio-chip-driver.patch
index db88c16963..105eb6d57e 100644
--- a/target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch
+++ b/target/linux/brcm63xx/patches-2.6.35/211-gen-74x164-gpio-chip-driver.patch
@@ -1,25 +1,27 @@
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
-@@ -343,4 +343,12 @@ config GPIO_JANZ_TTL
- This driver provides support for driving the pins in output
- mode only. Input mode is not supported.
+@@ -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.
-+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
++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-$(CONFIG_GPIO_NXP_74HC164) += nxp_74hc164.o
++obj-$(CONFIG_GPIO_74X164) += 74x164.o
obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
obj-$(CONFIG_GPIO_PL061) += pl061.o
@@ -253,27 +255,203 @@
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" NXP_74HC164_DRIVER_NAME);
--- /dev/null
-+++ b/include/linux/nxp_74hc164.h
-@@ -0,0 +1,22 @@
++++ b/drivers/gpio/74x164.c
+@@ -0,0 +1,184 @@
+/*
-+ * NXP 74HC164 - Dual 4-input multiplexer defines
++ * 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.
+ */
+
-+#ifndef _NXP_74HC164_H
-+#define _NXP_74HC164_H
++#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 NXP_74HC164_DRIVER_NAME "nxp-74hc164"
++#define GEN_74X164_DRIVER_NAME "74x164"
+
-+struct nxp_74hc164_platform_data {
-+ unsigned gpio_base;
-+ unsigned gpio_pin_data;
-+ unsigned gpio_pin_clk;
++struct gen_74x164_chip_platform_data {
++ /* number assigned to the first GPIO */
++ unsigned base;
+};
+
-+#endif /* _NXP_74HC164_H */
++#endif