mfd/gpio: add a GPIO interface to the UCB1400 MFD chip driver via gpiolib

Cc: Eric Miao <eric.y.miao@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Brownell <david-b@pacbell.net>
Cc: Samuel Ortiz <sameo@openedhand.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 138 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 223e7c92fd54..ccca08e0b595 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -202,4 +202,16 @@ config GPIO_MC33880
           SPI driver for Freescale MC33880 high-side/low-side switch.
           This provides GPIO interface supporting inputs and outputs.
 
+comment "AC97 GPIO expanders:"
+
+config GPIO_UCB1400
+        bool "Philips UCB1400 GPIO"
+        depends on UCB1400_CORE
+        help
+          This enables support for the Philips UCB1400 GPIO pins.
+          The UCB1400 is an AC97 audio codec.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ucb1400_gpio.
+
 endif
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index f35de16c7c49..c1ac034698c5 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_GPIO_PCA953X)	+= pca953x.o
 obj-$(CONFIG_GPIO_PCF857X)      += pcf857x.o
 obj-$(CONFIG_GPIO_PL061)        += pl061.o
 obj-$(CONFIG_GPIO_TWL4030)      += twl4030-gpio.o
+obj-$(CONFIG_GPIO_UCB1400)      += ucb1400_gpio.o
 obj-$(CONFIG_GPIO_XILINX)       += xilinx_gpio.o
 obj-$(CONFIG_GPIO_BT8XX)        += bt8xxgpio.o
 obj-$(CONFIG_GPIO_VR41XX)       += vr41xx_giu.o
diff --git a/drivers/gpio/ucb1400_gpio.c b/drivers/gpio/ucb1400_gpio.c
new file mode 100644
index 000000000000..50e6bd1392ce
--- /dev/null
+++ b/drivers/gpio/ucb1400_gpio.c
@@ -0,0 +1,125 @@
+/*
+ * Philips UCB1400 GPIO driver
+ *
+ * Author: Marek Vasut <marek.vasut@gmail.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/module.h>
+#include <linux/ucb1400.h>
+
+struct ucb1400_gpio_data *ucbdata;
+
+static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off)
+{
+        struct ucb1400_gpio *gpio;
+        gpio = container_of(gc, struct ucb1400_gpio, gc);
+        ucb1400_gpio_set_direction(gpio->ac97, off, 0);
+        return 0;
+}
+
+static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val)
+{
+        struct ucb1400_gpio *gpio;
+        gpio = container_of(gc, struct ucb1400_gpio, gc);
+        ucb1400_gpio_set_direction(gpio->ac97, off, 1);
+        ucb1400_gpio_set_value(gpio->ac97, off, val);
+        return 0;
+}
+
+static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off)
+{
+        struct ucb1400_gpio *gpio;
+        gpio = container_of(gc, struct ucb1400_gpio, gc);
+        return ucb1400_gpio_get_value(gpio->ac97, off);
+}
+
+static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val)
+{
+        struct ucb1400_gpio *gpio;
+        gpio = container_of(gc, struct ucb1400_gpio, gc);
+        ucb1400_gpio_set_value(gpio->ac97, off, val);
+}
+
+static int ucb1400_gpio_probe(struct platform_device *dev)
+{
+        struct ucb1400_gpio *ucb = dev->dev.platform_data;
+        int err = 0;
+
+        if (!(ucbdata && ucbdata->gpio_offset)) {
+                err = -EINVAL;
+                goto err;
+        }
+
+        platform_set_drvdata(dev, ucb);
+
+        ucb->gc.label = "ucb1400_gpio";
+        ucb->gc.base = ucbdata->gpio_offset;
+        ucb->gc.ngpio = 10;
+        ucb->gc.owner = THIS_MODULE;
+
+        ucb->gc.direction_input = ucb1400_gpio_dir_in;
+        ucb->gc.direction_output = ucb1400_gpio_dir_out;
+        ucb->gc.get = ucb1400_gpio_get;
+        ucb->gc.set = ucb1400_gpio_set;
+        ucb->gc.can_sleep = 1;
+
+        err = gpiochip_add(&ucb->gc);
+        if (err)
+                goto err;
+
+        if (ucbdata && ucbdata->gpio_setup)
+                err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio);
+
+err:
+        return err;
+
+}
+
+static int ucb1400_gpio_remove(struct platform_device *dev)
+{
+        int err = 0;
+        struct ucb1400_gpio *ucb = platform_get_drvdata(dev);
+
+        if (ucbdata && ucbdata->gpio_teardown) {
+                err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio);
+                if (err)
+                        return err;
+        }
+
+        err = gpiochip_remove(&ucb->gc);
+        return err;
+}
+
+static struct platform_driver ucb1400_gpio_driver = {
+        .probe  = ucb1400_gpio_probe,
+        .remove = ucb1400_gpio_remove,
+        .driver = {
+                .name   = "ucb1400_gpio"
+        },
+};
+
+static int __init ucb1400_gpio_init(void)
+{
+        return platform_driver_register(&ucb1400_gpio_driver);
+}
+
+static void __exit ucb1400_gpio_exit(void)
+{
+        platform_driver_unregister(&ucb1400_gpio_driver);
+}
+
+void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data)
+{
+        ucbdata = data;
+}
+
+module_init(ucb1400_gpio_init);
+module_exit(ucb1400_gpio_exit);
+
+MODULE_DESCRIPTION("Philips UCB1400 GPIO driver");
+MODULE_LICENSE("GPL");