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>

5 files changed, 184 insertions, 4 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");
diff --git a/drivers/mfd/ucb1400_core.c b/drivers/mfd/ucb1400_core.c
index 78c2135c5de6..2afc08006e6d 100644
--- a/drivers/mfd/ucb1400_core.c
+++ b/drivers/mfd/ucb1400_core.c
@@ -48,9 +48,11 @@ static int ucb1400_core_probe(struct device *dev)
         int err;
         struct ucb1400 *ucb;
         struct ucb1400_ts ucb_ts;
+        struct ucb1400_gpio ucb_gpio;
         struct snd_ac97 *ac97;
 
         memset(&ucb_ts, 0, sizeof(ucb_ts));
+        memset(&ucb_gpio, 0, sizeof(ucb_gpio));
 
         ucb = kzalloc(sizeof(struct ucb1400), GFP_KERNEL);
         if (!ucb) {
@@ -68,25 +70,44 @@ static int ucb1400_core_probe(struct device *dev)
                 goto err0;
         }
 
+        /* GPIO */
+        ucb_gpio.ac97 = ac97;
+        ucb->ucb1400_gpio = platform_device_alloc("ucb1400_gpio", -1);
+        if (!ucb->ucb1400_gpio) {
+                err = -ENOMEM;
+                goto err0;
+        }
+        err = platform_device_add_data(ucb->ucb1400_gpio, &ucb_gpio,
+                                        sizeof(ucb_gpio));
+        if (err)
+                goto err1;
+        err = platform_device_add(ucb->ucb1400_gpio);
+        if (err)
+                goto err1;
+
         /* TOUCHSCREEN */
         ucb_ts.ac97 = ac97;
         ucb->ucb1400_ts = platform_device_alloc("ucb1400_ts", -1);
         if (!ucb->ucb1400_ts) {
                 err = -ENOMEM;
-                goto err0;
+                goto err2;
         }
         err = platform_device_add_data(ucb->ucb1400_ts, &ucb_ts,
                                         sizeof(ucb_ts));
         if (err)
-                goto err1;
+                goto err3;
         err = platform_device_add(ucb->ucb1400_ts);
         if (err)
-                goto err1;
+                goto err3;
 
         return 0;
 
-err1:
+err3:
         platform_device_put(ucb->ucb1400_ts);
+err2:
+        platform_device_unregister(ucb->ucb1400_gpio);
+err1:
+        platform_device_put(ucb->ucb1400_gpio);
 err0:
         kfree(ucb);
 err:
@@ -98,6 +119,8 @@ static int ucb1400_core_remove(struct device *dev)
         struct ucb1400 *ucb = dev_get_drvdata(dev);
 
         platform_device_unregister(ucb->ucb1400_ts);
+        platform_device_unregister(ucb->ucb1400_gpio);
+
         kfree(ucb);
         return 0;
 }
diff --git a/include/linux/ucb1400.h b/include/linux/ucb1400.h
index ae779bb8cc0f..adb44066680c 100644
--- a/include/linux/ucb1400.h
+++ b/include/linux/ucb1400.h
@@ -26,6 +26,7 @@
 #include <sound/ac97_codec.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
+#include <linux/gpio.h>
 
 /*
  * UCB1400 AC-link registers
@@ -82,6 +83,17 @@
 #define UCB_ID                  0x7e
 #define UCB_ID_1400             0x4304
 
+struct ucb1400_gpio_data {
+        int gpio_offset;
+        int (*gpio_setup)(struct device *dev, int ngpio);
+        int (*gpio_teardown)(struct device *dev, int ngpio);
+};
+
+struct ucb1400_gpio {
+        struct gpio_chip        gc;
+        struct snd_ac97         *ac97;
+};
+
 struct ucb1400_ts {
         struct input_dev        *ts_idev;
         struct task_struct      *ts_task;
@@ -95,6 +107,7 @@ struct ucb1400_ts {
 
 struct ucb1400 {
         struct platform_device  *ucb1400_ts;
+        struct platform_device  *ucb1400_gpio;
 };
 
 static inline u16 ucb1400_reg_read(struct snd_ac97 *ac97, u16 reg)
@@ -147,4 +160,10 @@ static inline void ucb1400_adc_disable(struct snd_ac97 *ac97)
 unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
                               int adcsync);
 
+#ifdef CONFIG_GPIO_UCB1400
+void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data);
+#else
+static inline void ucb1400_gpio_set_data(struct ucb1400_gpio_data *data) {}
+#endif
+
 #endif