ARM/mx35/3ds: gpio: add mc9s08dz60 gpio function

we only use the gpio function of mc9s08dz60 mcu chip, so just
add the gpio driver, as this mcu will never be used in other board.

Signed-off-by: Wu Guoxing <b39297@freescale.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/gpio/Kconfig

@@ -225,6 +225,12 @@ config GPIO_MAX732X_IRQ
 	  Say yes here to enable the max732x to be used as an interrupt
 	  controller. It requires the driver to be built in the kernel.
 
+config GPIO_MC9S08DZ60
+	bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"
+	depends on I2C && MACH_MX35_3DS
+	help
+	  Select this to enable the MC9S08DZ60 GPIO driver
+
 config GPIO_PCA953X
 	tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
 	depends on I2C

drivers/gpio/Makefile

@@ -26,6 +26,7 @@ obj-$(CONFIG_GPIO_MAX7300)	+= gpio-max7300.o
 obj-$(CONFIG_GPIO_MAX7301)	+= gpio-max7301.o
 obj-$(CONFIG_GPIO_MAX732X)	+= gpio-max732x.o
 obj-$(CONFIG_GPIO_MC33880)	+= gpio-mc33880.o
+obj-$(CONFIG_GPIO_MC9S08DZ60)	+= gpio-mc9s08dz60.o
 obj-$(CONFIG_GPIO_MCP23S08)	+= gpio-mcp23s08.o
 obj-$(CONFIG_GPIO_ML_IOH)	+= gpio-ml-ioh.o
 obj-$(CONFIG_GPIO_MPC5200)	+= gpio-mpc5200.o

drivers/gpio/gpio-mc9s08dz60.c

@@ -0,0 +1,161 @@
+/*
+ * Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * Author: Wu Guoxing <b39297@freescale.com>
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+
+#define GPIO_GROUP_NUM 2
+#define GPIO_NUM_PER_GROUP 8
+#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)
+
+struct mc9s08dz60 {
+	struct i2c_client *client;
+	struct gpio_chip chip;
+};
+
+static inline struct mc9s08dz60 *to_mc9s08dz60(struct gpio_chip *gc)
+{
+	return container_of(gc, struct mc9s08dz60, chip);
+}
+
+
+static void mc9s_gpio_to_reg_and_bit(int offset, u8 *reg, u8 *bit)
+{
+	*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
+	*bit = offset % GPIO_NUM_PER_GROUP;
+}
+
+static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
+{
+	u8 reg, bit;
+	s32 value;
+	struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
+
+	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
+	value = i2c_smbus_read_byte_data(mc9s->client, reg);
+
+	return (value >= 0) ? (value >> bit) & 0x1 : 0;
+}
+
+static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
+{
+	u8 reg, bit;
+	s32 value;
+
+	mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
+	value = i2c_smbus_read_byte_data(mc9s->client, reg);
+	if (value >= 0) {
+		if (val)
+			value |= 1 << bit;
+		else
+			value &= ~(1 << bit);
+
+		return i2c_smbus_write_byte_data(mc9s->client, reg, value);
+	} else
+		return value;
+
+}
+
+
+static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
+{
+	struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
+
+	mc9s08dz60_set(mc9s, offset, val);
+}
+
+static int mc9s08dz60_direction_output(struct gpio_chip *gc,
+				       unsigned offset, int val)
+{
+	struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
+
+	return mc9s08dz60_set(mc9s, offset, val);
+}
+
+static int mc9s08dz60_probe(struct i2c_client *client,
+			    const struct i2c_device_id *id)
+{
+	int ret = 0;
+	struct mc9s08dz60 *mc9s;
+
+	mc9s = kzalloc(sizeof(*mc9s), GFP_KERNEL);
+	if (!mc9s)
+		return -ENOMEM;
+
+	mc9s->chip.label = client->name;
+	mc9s->chip.base = -1;
+	mc9s->chip.dev = &client->dev;
+	mc9s->chip.owner = THIS_MODULE;
+	mc9s->chip.ngpio = GPIO_NUM;
+	mc9s->chip.can_sleep = 1;
+	mc9s->chip.get = mc9s08dz60_get_value;
+	mc9s->chip.set = mc9s08dz60_set_value;
+	mc9s->chip.direction_output = mc9s08dz60_direction_output;
+	mc9s->client = client;
+	i2c_set_clientdata(client, mc9s);
+
+	ret = gpiochip_add(&mc9s->chip);
+	if (ret)
+		goto error;
+
+	return 0;
+
+ error:
+	kfree(mc9s);
+	return ret;
+}
+
+static int mc9s08dz60_remove(struct i2c_client *client)
+{
+	struct mc9s08dz60 *mc9s;
+	int ret;
+
+	mc9s = i2c_get_clientdata(client);
+
+	ret = gpiochip_remove(&mc9s->chip);
+	if (!ret)
+		kfree(mc9s);
+
+	return ret;
+
+}
+
+static const struct i2c_device_id mc9s08dz60_id[] = {
+	{"mc9s08dz60", 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(i2c, mc9s08dz60_id);
+
+static struct i2c_driver mc9s08dz60_i2c_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "mc9s08dz60",
+	},
+	.probe = mc9s08dz60_probe,
+	.remove = mc9s08dz60_remove,
+	.id_table = mc9s08dz60_id,
+};
+
+module_i2c_driver(mc9s08dz60_i2c_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc. "
+		"Wu Guoxing <b39297@freescale.com>");
+MODULE_DESCRIPTION("mc9s08dz60 gpio function on mx35 3ds board");
+MODULE_LICENSE("GPL v2");