gpio: Add PCA9698 40-bit I2C I/O port

Signed-off-by: Dirk Eibach <eibach@gdsys.de>

gpio: Add PCA9698 40-bit I2C I/O port
Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Dirk Eibach · Wolfgang Denk
1 parent 96baa4c376
Showing 3 changed files with 133 additions and 0 deletions Side-by-side Diff
drivers/gpio/Makefile
drivers/gpio/pca9698.c
include/pca9698.h
@@ -31,6 +31,7 @@
 COBJS-$(CONFIG_MARVELL_MFP)	+= mvmfp.o
 COBJS-$(CONFIG_MXC_GPIO)	+= mxc_gpio.o
 COBJS-$(CONFIG_PCA953X)		+= pca953x.o
+COBJS-$(CONFIG_PCA9698)		+= pca9698.o
 COBJS-$(CONFIG_S5P)		+= s5p_gpio.o
 COBJS-$(CONFIG_TEGRA2_GPIO)	+= tegra2_gpio.o
 COBJS-$(CONFIG_DA8XX_GPIO)	+= da8xx_gpio.o
+/*
+ * (C) Copyright 2011
+ * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
+ *
+ * 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
+ */
+
+/*
+ * Driver for NXP's pca9698 40 bit I2C gpio expander
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <pca9698.h>
+
+/*
+ * The pca9698 registers
+ */
+
+#define PCA9698_REG_INPUT		0x00
+#define PCA9698_REG_OUTPUT		0x08
+#define PCA9698_REG_POLARITY		0x10
+#define PCA9698_REG_CONFIG		0x18
+
+#define PCA9698_BUFFER_SIZE		5
+
+static int pca9698_read40(u8 chip, u8 offset, u8 *buffer)
+{
+	u8 command = offset | 0x80;  /* autoincrement */
+
+	return i2c_read(chip, command, 1, buffer, PCA9698_BUFFER_SIZE);
+}
+
+static int pca9698_write40(u8 chip, u8 offset, u8 *buffer)
+{
+	u8 command = offset | 0x80;  /* autoincrement */
+
+	return i2c_write(chip, command, 1, buffer, PCA9698_BUFFER_SIZE);
+}
+
+static void pca9698_set_bit(unsigned gpio, u8 *buffer, unsigned value)
+{
+	unsigned byte = gpio / 8;
+	unsigned bit = gpio % 8;
+
+	if (value)
+		buffer[byte] |= (1 << bit);
+	else
+		buffer[byte] &= ~(1 << bit);
+}
+
+int pca9698_direction_input(u8 chip, unsigned offset)
+{
+	u8 data[PCA9698_BUFFER_SIZE];
+	int res;
+
+	res = pca9698_read40(chip, PCA9698_REG_CONFIG, data);
+	if (res)
+		return res;
+
+	pca9698_set_bit(offset, data, 1);
+	return pca9698_write40(chip, PCA9698_REG_CONFIG, data);
+}
+
+int pca9698_direction_output(u8 chip, unsigned offset)
+{
+	u8 data[PCA9698_BUFFER_SIZE];
+	int res;
+
+	res = pca9698_read40(chip, PCA9698_REG_CONFIG, data);
+	if (res)
+		return res;
+
+	pca9698_set_bit(offset, data, 0);
+	return pca9698_write40(chip, PCA9698_REG_CONFIG, data);
+}
+
+int pca9698_get_input(u8 chip, unsigned offset)
+{
+	unsigned config_byte = offset / 8;
+	unsigned config_bit = offset % 8;
+	unsigned value;
+	u8 data[PCA9698_BUFFER_SIZE];
+	int res;
+
+	res = pca9698_read40(chip, PCA9698_REG_INPUT, data);
+	if (res)
+		return -1;
+
+	value = data[config_byte] & (1 << config_bit);
+
+	return !!value;
+}
+
+int pca9698_set_output(u8 chip, unsigned offset, int value)
+{
+	u8 data[PCA9698_BUFFER_SIZE];
+	int res;
+
+	res = pca9698_read40(chip, PCA9698_REG_OUTPUT, data);
+	if (res)
+		return res;
+
+	memset(data, sizeof(data), 0);
+	pca9698_set_bit(offset, data, value);
+	return pca9698_write40(chip, PCA9698_REG_OUTPUT, data);
+}
+#ifndef __PCA9698_H_
+#define __PCA9698_H_
+
+int pca9698_direction_input(u8 chip, unsigned offset);
+int pca9698_direction_output(u8 chip, unsigned offset);
+int pca9698_get_input(u8 chip, unsigned offset);
+int pca9698_set_output(u8 chip, unsigned offset, int value);
+
+#endif /* __PCA9698_H_ */
...	...	@@ -31,6 +31,7 @@
31	31	COBJS-$(CONFIG_MARVELL_MFP) += mvmfp.o
32	32	COBJS-$(CONFIG_MXC_GPIO) += mxc_gpio.o
33	33	COBJS-$(CONFIG_PCA953X) += pca953x.o
	34	+COBJS-$(CONFIG_PCA9698) += pca9698.o
34	35	COBJS-$(CONFIG_S5P) += s5p_gpio.o
35	36	COBJS-$(CONFIG_TEGRA2_GPIO) += tegra2_gpio.o
36	37	COBJS-$(CONFIG_DA8XX_GPIO) += da8xx_gpio.o
	1	+/*
	2	+ * (C) Copyright 2011
	3	+ * Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
	4	+ *
	5	+ * See file CREDITS for list of people who contributed to this
	6	+ * project.
	7	+ *
	8	+ * This program is free software; you can redistribute it and/or
	9	+ * modify it under the terms of the GNU General Public License as
	10	+ * published by the Free Software Foundation; either version 2 of
	11	+ * the License, or (at your option) any later version.
	12	+ *
	13	+ * This program is distributed in the hope that it will be useful,
	14	+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	+ * GNU General Public License for more details.
	17	+ *
	18	+ * You should have received a copy of the GNU General Public License
	19	+ * along with this program; if not, write to the Free Software
	20	+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	+ * MA 02111-1307 USA
	22	+ */
	23	+
	24	+/*
	25	+ * Driver for NXP's pca9698 40 bit I2C gpio expander
	26	+ */
	27	+
	28	+#include <common.h>
	29	+#include <i2c.h>
	30	+#include <pca9698.h>
	31	+
	32	+/*
	33	+ * The pca9698 registers
	34	+ */
	35	+
	36	+#define PCA9698_REG_INPUT 0x00
	37	+#define PCA9698_REG_OUTPUT 0x08
	38	+#define PCA9698_REG_POLARITY 0x10
	39	+#define PCA9698_REG_CONFIG 0x18
	40	+
	41	+#define PCA9698_BUFFER_SIZE 5
	42	+
	43	+static int pca9698_read40(u8 chip, u8 offset, u8 *buffer)
	44	+{
	45	+ u8 command = offset \| 0x80; /* autoincrement */
	46	+
	47	+ return i2c_read(chip, command, 1, buffer, PCA9698_BUFFER_SIZE);
	48	+}
	49	+
	50	+static int pca9698_write40(u8 chip, u8 offset, u8 *buffer)
	51	+{
	52	+ u8 command = offset \| 0x80; /* autoincrement */
	53	+
	54	+ return i2c_write(chip, command, 1, buffer, PCA9698_BUFFER_SIZE);
	55	+}
	56	+
	57	+static void pca9698_set_bit(unsigned gpio, u8 *buffer, unsigned value)
	58	+{
	59	+ unsigned byte = gpio / 8;
	60	+ unsigned bit = gpio % 8;
	61	+
	62	+ if (value)
	63	+ buffer[byte] \|= (1 << bit);
	64	+ else
	65	+ buffer[byte] &= ~(1 << bit);
	66	+}
	67	+
	68	+int pca9698_direction_input(u8 chip, unsigned offset)
	69	+{
	70	+ u8 data[PCA9698_BUFFER_SIZE];
	71	+ int res;
	72	+
	73	+ res = pca9698_read40(chip, PCA9698_REG_CONFIG, data);
	74	+ if (res)
	75	+ return res;
	76	+
	77	+ pca9698_set_bit(offset, data, 1);
	78	+ return pca9698_write40(chip, PCA9698_REG_CONFIG, data);
	79	+}
	80	+
	81	+int pca9698_direction_output(u8 chip, unsigned offset)
	82	+{
	83	+ u8 data[PCA9698_BUFFER_SIZE];
	84	+ int res;
	85	+
	86	+ res = pca9698_read40(chip, PCA9698_REG_CONFIG, data);
	87	+ if (res)
	88	+ return res;
	89	+
	90	+ pca9698_set_bit(offset, data, 0);
	91	+ return pca9698_write40(chip, PCA9698_REG_CONFIG, data);
	92	+}
	93	+
	94	+int pca9698_get_input(u8 chip, unsigned offset)
	95	+{
	96	+ unsigned config_byte = offset / 8;
	97	+ unsigned config_bit = offset % 8;
	98	+ unsigned value;
	99	+ u8 data[PCA9698_BUFFER_SIZE];
	100	+ int res;
	101	+
	102	+ res = pca9698_read40(chip, PCA9698_REG_INPUT, data);
	103	+ if (res)
	104	+ return -1;
	105	+
	106	+ value = data[config_byte] & (1 << config_bit);
	107	+
	108	+ return !!value;
	109	+}
	110	+
	111	+int pca9698_set_output(u8 chip, unsigned offset, int value)
	112	+{
	113	+ u8 data[PCA9698_BUFFER_SIZE];
	114	+ int res;
	115	+
	116	+ res = pca9698_read40(chip, PCA9698_REG_OUTPUT, data);
	117	+ if (res)
	118	+ return res;
	119	+
	120	+ memset(data, sizeof(data), 0);
	121	+ pca9698_set_bit(offset, data, value);
	122	+ return pca9698_write40(chip, PCA9698_REG_OUTPUT, data);
	123	+}
	1	+#ifndef __PCA9698_H_
	2	+#define __PCA9698_H_
	3	+
	4	+int pca9698_direction_input(u8 chip, unsigned offset);
	5	+int pca9698_direction_output(u8 chip, unsigned offset);
	6	+int pca9698_get_input(u8 chip, unsigned offset);
	7	+int pca9698_set_output(u8 chip, unsigned offset, int value);
	8	+
	9	+#endif /* __PCA9698_H_ */