TPS65910: GPIO: Add GPIO driver

TPS65910 has one configurable GPIO that can be used for several
purposes. Subsequent versions of the TPS chip support more than
one GPIO.
Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/mfd/Makefile

@@ -93,4 +93,4 @@ obj-$(CONFIG_MFD_CS5535)	+= cs5535-mfd.o
 obj-$(CONFIG_MFD_OMAP_USB_HOST)	+= omap-usb-host.o
 obj-$(CONFIG_MFD_PM8921_CORE) 	+= pm8921-core.o
 obj-$(CONFIG_MFD_PM8XXX_IRQ) 	+= pm8xxx-irq.o
-obj-$(CONFIG_MFD_TPS65910)	+= tps65910.o
+obj-$(CONFIG_MFD_TPS65910)	+= tps65910.o tps65910-gpio.o

drivers/mfd/tps65910-gpio.c

+/*
+ * tps65910-gpio.c  --  TI TPS6591x
+ *
+ * Copyright 2010 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ * Author: Jorge Eduardo Candelaria jedu@slimlogic.co.uk>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under  the terms of the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/mfd/tps65910.h>
+
+static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+	uint8_t val;
+
+	tps65910->read(tps65910, TPS65910_GPIO0, 1, &val);
+
+	if (val & GPIO0_GPIO_STS_MASK)
+		return 1;
+
+	return 0;
+}
+
+static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
+			      int value)
+{
+	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+
+	if (value)
+		tps65910_set_bits(tps65910, TPS65910_GPIO0,
+					GPIO0_GPIO_SET_MASK);
+	else
+		tps65910_clear_bits(tps65910, TPS65910_GPIO0,
+					GPIO0_GPIO_SET_MASK);
+}
+
+static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
+				int value)
+{
+	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+
+	/* Set the initial value */
+	tps65910_gpio_set(gc, 0, value);
+
+	return tps65910_set_bits(tps65910, TPS65910_GPIO0, GPIO0_GPIO_CFG_MASK);
+}
+
+static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+
+	return tps65910_clear_bits(tps65910, TPS65910_GPIO0,
+					GPIO0_GPIO_CFG_MASK);
+}
+
+void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
+{
+	int ret;
+
+	if (!gpio_base)
+		return;
+
+	tps65910->gpio.owner		= THIS_MODULE;
+	tps65910->gpio.label		= tps65910->i2c_client->name;
+	tps65910->gpio.dev		= tps65910->dev;
+	tps65910->gpio.base		= gpio_base;
+	tps65910->gpio.ngpio		= 1;
+	tps65910->gpio.can_sleep	= 1;
+
+	tps65910->gpio.direction_input	= tps65910_gpio_input;
+	tps65910->gpio.direction_output	= tps65910_gpio_output;
+	tps65910->gpio.set		= tps65910_gpio_set;
+	tps65910->gpio.get		= tps65910_gpio_get;
+
+	ret = gpiochip_add(&tps65910->gpio);
+
+	if (ret)
+		dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);
+}

drivers/mfd/tps65910.c

@@ -135,8 +135,13 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 			    const struct i2c_device_id *id)
 {
 	struct tps65910 *tps65910;
+	struct tps65910_board *pmic_plat_data;
 	int ret = 0;
 
+	pmic_plat_data = dev_get_platdata(&i2c->dev);
+	if (!pmic_plat_data)
+		return -EINVAL;
+
 	tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
 	if (tps65910 == NULL)
 		return -ENOMEM;
@@ -154,6 +159,8 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
 	if (ret < 0)
 		goto err;
 
+	tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
+
 	return ret;
 
 err:

include/linux/mfd/tps65910.h

@@ -714,6 +714,7 @@
  */
 
 struct tps65910_board {
+	int gpio_base;
 	struct regulator_init_data *tps65910_pmic_init_data;
 };
 
@@ -749,5 +750,6 @@ struct tps65910_platform_data {
 
 int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
 int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
+void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base);
 
 #endif /*  __LINUX_MFD_TPS65910_H */