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>

1 files changed, 196 insertions, 0 deletions

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");
+