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authorRichard Röjfors <richard.rojfors.ext@mocean-labs.com>2009-09-22 16:46:34 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:46 -0700
commit1e5db00687c1ebd93a902caf1d3694209013cb3e (patch)
tree41043a4a38fc2f36d92fe20559cb5ada85228465 /drivers/gpio
parenta4177ee7f1a83eecb1d75e85d32664b023ef65e9 (diff)
gpio: add MC33880 driver
A GPIO driver for the Freescale MC33880 High/Low side switch Signed-off-by: Richard Röjfors <richard.rojfors.ext@mocean-labs.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/Kconfig7
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/mc33880.c196
3 files changed, 204 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 6b4c484a699a..223e7c92fd54 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -195,4 +195,11 @@ config GPIO_MCP23S08
SPI driver for Microchip MCP23S08 I/O expander. This provides
a GPIO interface supporting inputs and outputs.
+config GPIO_MC33880
+ tristate "Freescale MC33880 high-side/low-side switch"
+ depends on SPI_MASTER
+ help
+ SPI driver for Freescale MC33880 high-side/low-side switch.
+ This provides GPIO interface supporting inputs and outputs.
+
endif
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index ea7c745f26a8..f35de16c7c49 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_GPIOLIB) += gpiolib.o
obj-$(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_PCA953X) += pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
diff --git a/drivers/gpio/mc33880.c b/drivers/gpio/mc33880.c
new file mode 100644
index 000000000000..e7d01bd8fdb3
--- /dev/null
+++ b/drivers/gpio/mc33880.c
@@ -0,0 +1,196 @@
+/*
+ * mc33880.c MC33880 high-side/low-side switch GPIO driver
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * Freescale MC33880 high-side/low-side switch
+ */
+
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/mc33880.h>
+#include <linux/gpio.h>
+
+#define DRIVER_NAME "mc33880"
+
+/*
+ * Pin configurations, see MAX7301 datasheet page 6
+ */
+#define PIN_CONFIG_MASK 0x03
+#define PIN_CONFIG_IN_PULLUP 0x03
+#define PIN_CONFIG_IN_WO_PULLUP 0x02
+#define PIN_CONFIG_OUT 0x01
+
+#define PIN_NUMBER 8
+
+
+/*
+ * Some registers must be read back to modify.
+ * To save time we cache them here in memory
+ */
+struct mc33880 {
+ struct mutex lock; /* protect from simultanous accesses */
+ u8 port_config;
+ struct gpio_chip chip;
+ struct spi_device *spi;
+};
+
+static int mc33880_write_config(struct mc33880 *mc)
+{
+ return spi_write(mc->spi, &mc->port_config, sizeof(mc->port_config));
+}
+
+
+static int __mc33880_set(struct mc33880 *mc, unsigned offset, int value)
+{
+ if (value)
+ mc->port_config |= 1 << offset;
+ else
+ mc->port_config &= ~(1 << offset);
+
+ return mc33880_write_config(mc);
+}
+
+
+static void mc33880_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct mc33880 *mc = container_of(chip, struct mc33880, chip);
+
+ mutex_lock(&mc->lock);
+
+ __mc33880_set(mc, offset, value);
+
+ mutex_unlock(&mc->lock);
+}
+
+static int __devinit mc33880_probe(struct spi_device *spi)
+{
+ struct mc33880 *mc;
+ struct mc33880_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;
+
+ mc = kzalloc(sizeof(struct mc33880), GFP_KERNEL);
+ if (!mc)
+ return -ENOMEM;
+
+ mutex_init(&mc->lock);
+
+ dev_set_drvdata(&spi->dev, mc);
+
+ mc->spi = spi;
+
+ mc->chip.label = DRIVER_NAME,
+ mc->chip.set = mc33880_set;
+ mc->chip.base = pdata->base;
+ mc->chip.ngpio = PIN_NUMBER;
+ mc->chip.can_sleep = 1;
+ mc->chip.dev = &spi->dev;
+ mc->chip.owner = THIS_MODULE;
+
+ mc->port_config = 0x00;
+ /* write twice, because during initialisation the first setting
+ * is just for testing SPI communication, and the second is the
+ * "real" configuration
+ */
+ ret = mc33880_write_config(mc);
+ mc->port_config = 0x00;
+ if (!ret)
+ ret = mc33880_write_config(mc);
+
+ if (ret) {
+ printk(KERN_ERR "Failed writing to " DRIVER_NAME ": %d\n", ret);
+ goto exit_destroy;
+ }
+
+ ret = gpiochip_add(&mc->chip);
+ if (ret)
+ goto exit_destroy;
+
+ return ret;
+
+exit_destroy:
+ dev_set_drvdata(&spi->dev, NULL);
+ mutex_destroy(&mc->lock);
+ kfree(mc);
+ return ret;
+}
+
+static int mc33880_remove(struct spi_device *spi)
+{
+ struct mc33880 *mc;
+ int ret;
+
+ mc = dev_get_drvdata(&spi->dev);
+ if (mc == NULL)
+ return -ENODEV;
+
+ dev_set_drvdata(&spi->dev, NULL);
+
+ ret = gpiochip_remove(&mc->chip);
+ if (!ret) {
+ mutex_destroy(&mc->lock);
+ kfree(mc);
+ } else
+ dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n",
+ ret);
+
+ return ret;
+}
+
+static struct spi_driver mc33880_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = mc33880_probe,
+ .remove = __devexit_p(mc33880_remove),
+};
+
+static int __init mc33880_init(void)
+{
+ return spi_register_driver(&mc33880_driver);
+}
+/* register after spi postcore initcall and before
+ * subsys initcalls that may rely on these GPIOs
+ */
+subsys_initcall(mc33880_init);
+
+static void __exit mc33880_exit(void)
+{
+ spi_unregister_driver(&mc33880_driver);
+}
+module_exit(mc33880_exit);
+
+MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
+MODULE_LICENSE("GPL v2");
+