Add TC35892 I2C GPIO expander driver

Add a simple driver for the I2C-controlled TC35892 GPIO
expander.

Change-Id: I49389d808353ca6b43cc38e1c7518de38f14ef51
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/1047
Reviewed-by: Par-Olof HAKANSSON <par-olof.hakansson@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Tested-by: Jonas ABERG <jonas.aberg@stericsson.com>

2 files changed, 77 insertions, 0 deletions

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index acba56c1c..fc3ee5ea9 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -28,6 +28,7 @@ LIB 	:= $(obj)libgpio.a
 COBJS-$(CONFIG_KIRKWOOD_GPIO)	+= kw_gpio.o
 COBJS-$(CONFIG_MX31_GPIO)	+= mx31_gpio.o
 COBJS-$(CONFIG_PCA953X)		+= pca953x.o
+COBJS-$(CONFIG_TC35892_GPIO)	+= tc35892.o
 
 COBJS	:= $(COBJS-y)
 SRCS 	:= $(COBJS:.o=.c)
diff --git a/drivers/gpio/tc35892.c b/drivers/gpio/tc35892.c
new file mode 100644
index 000000000..7fa55263d
--- /dev/null
+++ b/drivers/gpio/tc35892.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2010 ST-Ericsson SA
+ *
+ * Author: Rabin Vincent <rabin.vincent@stericsson.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <tc35892.h>
+
+#define GPIODATA0	0xC0
+#define GPIODATA1	0xC2
+#define GPIODATA2	0xC4
+#define GPIODIR0	0xC6
+#define GPIODIR1	0xC7
+#define GPIODIR2	0xC8
+
+int tc35892_gpio_dir(int addr, int pin, int dir)
+{
+	uchar reg = GPIODIR0 + pin / 8;
+	uchar pos = pin % 8;
+	uchar data;
+	int ret;
+
+	ret = i2c_read(addr, reg, sizeof(reg), &data, sizeof(data));
+	if (ret)
+		return ret;
+
+	if (dir)
+		data |= (1 << pos);
+	else
+		data &= ~(1 << pos);
+
+	return i2c_write(addr, reg, sizeof(reg), &data, sizeof(data));
+}
+
+int tc35892_gpio_get(int addr, int pin, int val)
+{
+	uchar reg = GPIODATA0 + (pin / 8) * 2;
+	uchar pos = pin % 8;
+	uchar data;
+	int ret;
+
+	ret = i2c_read(addr, reg, sizeof(reg), &data, sizeof(data));
+	if (ret < 0)
+		return ret;
+
+	return !!(data & (1 << pos));
+}
+
+int tc35892_gpio_set(int addr, int pin, int val)
+{
+	uchar reg = GPIODATA0 + (pin / 8) * 2;
+	uchar pos = pin % 8;
+	uchar data[] = {val << pos, 1 << pos};
+
+	return i2c_write(addr, reg, sizeof(reg), data, sizeof(data));
+}