[PATCH 2/4] i2c: add i2c algo bit support
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Thu Nov 1 05:44:50 EDT 2012
This is needed for i2c-gpio support
Based on linux 3.7-rc2
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
drivers/i2c/Kconfig | 1 +
drivers/i2c/Makefile | 2 +-
drivers/i2c/algos/Kconfig | 6 +
drivers/i2c/algos/Makefile | 5 +
drivers/i2c/algos/i2c-algo-bit.c | 585 ++++++++++++++++++++++++++++++++++++++
include/i2c/i2c-algo-bit.h | 55 ++++
include/i2c/i2c.h | 2 +
7 files changed, 655 insertions(+), 1 deletion(-)
create mode 100644 drivers/i2c/algos/Kconfig
create mode 100644 drivers/i2c/algos/Makefile
create mode 100644 drivers/i2c/algos/i2c-algo-bit.c
create mode 100644 include/i2c/i2c-algo-bit.h
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index c2af818..038e2ee 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -3,6 +3,7 @@ menuconfig I2C
if I2C
+source drivers/i2c/algos/Kconfig
source drivers/i2c/busses/Kconfig
endif
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 42e22c0..5ce0324 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -1 +1 @@
-obj-$(CONFIG_I2C) += i2c.o busses/
+obj-$(CONFIG_I2C) += i2c.o busses/ algos/
diff --git a/drivers/i2c/algos/Kconfig b/drivers/i2c/algos/Kconfig
new file mode 100644
index 0000000..c74b148
--- /dev/null
+++ b/drivers/i2c/algos/Kconfig
@@ -0,0 +1,6 @@
+#
+# I2C algorithm drivers configuration
+#
+
+config I2C_ALGOBIT
+ bool
diff --git a/drivers/i2c/algos/Makefile b/drivers/i2c/algos/Makefile
new file mode 100644
index 0000000..e0a0399
--- /dev/null
+++ b/drivers/i2c/algos/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the i2c algorithms
+#
+
+obj-$(CONFIG_I2C_ALGOBIT) += i2c-algo-bit.o
diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
new file mode 100644
index 0000000..37af27c
--- /dev/null
+++ b/drivers/i2c/algos/i2c-algo-bit.c
@@ -0,0 +1,585 @@
+/* -------------------------------------------------------------------------
+ * i2c-algo-bit.c i2c driver algorithms for bit-shift adapters
+ * -------------------------------------------------------------------------
+ * Copyright (C) 1995-2000 Simon G. Vogl
+
+ 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., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301 USA.
+ * ------------------------------------------------------------------------- */
+
+/* With some changes from Frodo Looijaard <frodol at dds.nl>, Kyösti Mälkki
+ <kmalkki at cc.hut.fi> and Jean Delvare <khali at linux-fr.org> */
+
+#include <common.h>
+#include <init.h>
+#include <errno.h>
+#include <clock.h>
+#include <i2c/i2c.h>
+#include <i2c/i2c-algo-bit.h>
+
+/* ----- global defines ----------------------------------------------- */
+
+#ifdef DEBUG
+#define bit_dbg(level, dev, format, args...) \
+ do { \
+ if (i2c_debug >= level) \
+ dev_dbg(dev, format, ##args); \
+ } while (0)
+#else
+#define bit_dbg(level, dev, format, args...) \
+ do {} while (0)
+#endif /* DEBUG */
+
+/* ----- global variables --------------------------------------------- */
+
+static int bit_test; /* see if the line-setting functions work */
+
+#ifdef DEBUG
+static int i2c_debug = 1;
+#endif
+
+/* --- setting states on the bus with the right timing: --------------- */
+
+#define setsda(adap, val) adap->setsda(adap->data, val)
+#define setscl(adap, val) adap->setscl(adap->data, val)
+#define getsda(adap) adap->getsda(adap->data)
+#define getscl(adap) adap->getscl(adap->data)
+
+static inline void sdalo(struct i2c_algo_bit_data *adap)
+{
+ setsda(adap, 0);
+ udelay((adap->udelay + 1) / 2);
+}
+
+static inline void sdahi(struct i2c_algo_bit_data *adap)
+{
+ setsda(adap, 1);
+ udelay((adap->udelay + 1) / 2);
+}
+
+static inline void scllo(struct i2c_algo_bit_data *adap)
+{
+ setscl(adap, 0);
+ udelay(adap->udelay / 2);
+}
+
+/*
+ * Raise scl line, and do checking for delays. This is necessary for slower
+ * devices.
+ */
+static int sclhi(struct i2c_algo_bit_data *adap)
+{
+ uint64_t start;
+
+ setscl(adap, 1);
+
+ /* Not all adapters have scl sense line... */
+ if (!adap->getscl)
+ goto done;
+
+ start = get_time_ns();
+ while (!getscl(adap)) {
+ /* This hw knows how to read the clock line, so we wait
+ * until it actually gets high. This is safer as some
+ * chips may hold it low ("clock stretching") while they
+ * are processing data internally.
+ */
+ if (is_timeout(start, adap->timeout_ms * MSECOND)) {
+ /* Test one last time, as we may have been preempted
+ * between last check and timeout test.
+ */
+ if (getscl(adap))
+ break;
+ return -ETIMEDOUT;
+ }
+ }
+#ifdef DEBUG
+ if (jiffies != start && i2c_debug >= 3)
+ pr_debug("i2c-algo-bit: needed %ld jiffies for SCL to go "
+ "high\n", jiffies - start);
+#endif
+
+done:
+ udelay(adap->udelay);
+ return 0;
+}
+
+
+/* --- other auxiliary functions -------------------------------------- */
+static void i2c_start(struct i2c_algo_bit_data *adap)
+{
+ /* assert: scl, sda are high */
+ setsda(adap, 0);
+ udelay(adap->udelay);
+ scllo(adap);
+}
+
+static void i2c_repstart(struct i2c_algo_bit_data *adap)
+{
+ /* assert: scl is low */
+ sdahi(adap);
+ sclhi(adap);
+ setsda(adap, 0);
+ udelay(adap->udelay);
+ scllo(adap);
+}
+
+
+static void i2c_stop(struct i2c_algo_bit_data *adap)
+{
+ /* assert: scl is low */
+ sdalo(adap);
+ sclhi(adap);
+ setsda(adap, 1);
+ udelay(adap->udelay);
+}
+
+
+
+/* send a byte without start cond., look for arbitration,
+ check ackn. from slave */
+/* returns:
+ * 1 if the device acknowledged
+ * 0 if the device did not ack
+ * -ETIMEDOUT if an error occurred (while raising the scl line)
+ */
+static int i2c_outb(struct i2c_adapter *i2c_adap, unsigned char c)
+{
+ int i;
+ int sb;
+ int ack;
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+
+ /* assert: scl is low */
+ for (i = 7; i >= 0; i--) {
+ sb = (c >> i) & 1;
+ setsda(adap, sb);
+ udelay((adap->udelay + 1) / 2);
+ if (sclhi(adap) < 0) { /* timed out */
+ bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, "
+ "timeout at bit #%d\n", (int)c, i);
+ return -ETIMEDOUT;
+ }
+ /* FIXME do arbitration here:
+ * if (sb && !getsda(adap)) -> ouch! Get out of here.
+ *
+ * Report a unique code, so higher level code can retry
+ * the whole (combined) message and *NOT* issue STOP.
+ */
+ scllo(adap);
+ }
+ sdahi(adap);
+ if (sclhi(adap) < 0) { /* timeout */
+ bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, "
+ "timeout at ack\n", (int)c);
+ return -ETIMEDOUT;
+ }
+
+ /* read ack: SDA should be pulled down by slave, or it may
+ * NAK (usually to report problems with the data we wrote).
+ */
+ ack = !getsda(adap); /* ack: sda is pulled low -> success */
+ bit_dbg(2, &i2c_adap->dev, "i2c_outb: 0x%02x %s\n", (int)c,
+ ack ? "A" : "NA");
+
+ scllo(adap);
+ return ack;
+ /* assert: scl is low (sda undef) */
+}
+
+
+static int i2c_inb(struct i2c_adapter *i2c_adap)
+{
+ /* read byte via i2c port, without start/stop sequence */
+ /* acknowledge is sent in i2c_read. */
+ int i;
+ unsigned char indata = 0;
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+
+ /* assert: scl is low */
+ sdahi(adap);
+ for (i = 0; i < 8; i++) {
+ if (sclhi(adap) < 0) { /* timeout */
+ bit_dbg(1, &i2c_adap->dev, "i2c_inb: timeout at bit "
+ "#%d\n", 7 - i);
+ return -ETIMEDOUT;
+ }
+ indata *= 2;
+ if (getsda(adap))
+ indata |= 0x01;
+ setscl(adap, 0);
+ udelay(i == 7 ? adap->udelay / 2 : adap->udelay);
+ }
+ /* assert: scl is low */
+ return indata;
+}
+
+/*
+ * Sanity check for the adapter hardware - check the reaction of
+ * the bus lines only if it seems to be idle.
+ */
+static int test_bus(struct i2c_adapter *i2c_adap)
+{
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+ struct device_d *dev = &i2c_adap->dev;
+ int scl, sda, ret;
+
+ if (adap->pre_xfer) {
+ ret = adap->pre_xfer(i2c_adap);
+ if (ret < 0)
+ return -ENODEV;
+ }
+
+ if (adap->getscl == NULL)
+ dev_info(dev, "Testing SDA only, SCL is not readable\n");
+
+ sda = getsda(adap);
+ scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+ if (!scl || !sda) {
+ dev_warn(dev, "bus seems to be busy (scl=%d, sda=%d)\n", scl, sda);
+ goto bailout;
+ }
+
+ sdalo(adap);
+ sda = getsda(adap);
+ scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+ if (sda) {
+ dev_warn(dev, "SDA stuck high!\n");
+ goto bailout;
+ }
+ if (!scl) {
+ dev_warn(dev, "SCL unexpected low while pulling SDA low!\n");
+ goto bailout;
+ }
+
+ sdahi(adap);
+ sda = getsda(adap);
+ scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+ if (!sda) {
+ dev_warn(dev, "SDA stuck low!\n");
+ goto bailout;
+ }
+ if (!scl) {
+ dev_warn(dev, "SCL unexpected low while pulling SDA high!\n");
+ goto bailout;
+ }
+
+ scllo(adap);
+ sda = getsda(adap);
+ scl = (adap->getscl == NULL) ? 0 : getscl(adap);
+ if (scl) {
+ dev_warn(dev, "SCL stuck high!\n");
+ goto bailout;
+ }
+ if (!sda) {
+ dev_warn(dev, "SDA unexpected low while pulling SCL low!\n");
+ goto bailout;
+ }
+
+ sclhi(adap);
+ sda = getsda(adap);
+ scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+ if (!scl) {
+ dev_warn(dev, "SCL stuck low!\n");
+ goto bailout;
+ }
+ if (!sda) {
+ dev_warn(dev, "SDA unexpected low while pulling SCL high!\n");
+ goto bailout;
+ }
+
+ if (adap->post_xfer)
+ adap->post_xfer(i2c_adap);
+
+ dev_info(dev, "Test OK\n");
+ return 0;
+bailout:
+ sdahi(adap);
+ sclhi(adap);
+
+ if (adap->post_xfer)
+ adap->post_xfer(i2c_adap);
+
+ return -ENODEV;
+}
+
+/* ----- Utility functions
+ */
+
+/* try_address tries to contact a chip for a number of
+ * times before it gives up.
+ * return values:
+ * 1 chip answered
+ * 0 chip did not answer
+ * -x transmission error
+ */
+static int try_address(struct i2c_adapter *i2c_adap,
+ unsigned char addr, int retries)
+{
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+ int i, ret = 0;
+
+ for (i = 0; i <= retries; i++) {
+ ret = i2c_outb(i2c_adap, addr);
+ if (ret == 1 || i == retries)
+ break;
+ bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n");
+ i2c_stop(adap);
+ udelay(adap->udelay);
+ bit_dbg(3, &i2c_adap->dev, "emitting start condition\n");
+ i2c_start(adap);
+ }
+ if (i && ret)
+ bit_dbg(1, &i2c_adap->dev, "Used %d tries to %s client at "
+ "0x%02x: %s\n", i + 1,
+ addr & 1 ? "read from" : "write to", addr >> 1,
+ ret == 1 ? "success" : "failed, timeout?");
+ return ret;
+}
+
+static int sendbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
+{
+ const unsigned char *temp = msg->buf;
+ int count = msg->len;
+ unsigned short nak_ok = msg->flags & I2C_M_IGNORE_NAK;
+ int retval;
+ int wrcount = 0;
+
+ while (count > 0) {
+ retval = i2c_outb(i2c_adap, *temp);
+
+ /* OK/ACK; or ignored NAK */
+ if ((retval > 0) || (nak_ok && (retval == 0))) {
+ count--;
+ temp++;
+ wrcount++;
+
+ /* A slave NAKing the master means the slave didn't like
+ * something about the data it saw. For example, maybe
+ * the SMBus PEC was wrong.
+ */
+ } else if (retval == 0) {
+ dev_err(&i2c_adap->dev, "sendbytes: NAK bailout.\n");
+ return -EIO;
+
+ /* Timeout; or (someday) lost arbitration
+ *
+ * FIXME Lost ARB implies retrying the transaction from
+ * the first message, after the "winning" master issues
+ * its STOP. As a rule, upper layer code has no reason
+ * to know or care about this ... it is *NOT* an error.
+ */
+ } else {
+ dev_err(&i2c_adap->dev, "sendbytes: error %d\n",
+ retval);
+ return retval;
+ }
+ }
+ return wrcount;
+}
+
+static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
+{
+ int inval;
+ int rdcount = 0; /* counts bytes read */
+ unsigned char *temp = msg->buf;
+ int count = msg->len;
+
+ while (count > 0) {
+ inval = i2c_inb(i2c_adap);
+ if (inval >= 0) {
+ *temp = inval;
+ rdcount++;
+ } else { /* read timed out */
+ break;
+ }
+
+ temp++;
+ count--;
+
+ bit_dbg(2, &i2c_adap->dev, "readbytes: 0x%02x %s\n",
+ inval,
+ (flags & I2C_M_NO_RD_ACK)
+ ? "(no ack/nak)"
+ : (count ? "A" : "NA"));
+ }
+ return rdcount;
+}
+
+/* doAddress initiates the transfer by generating the start condition (in
+ * try_address) and transmits the address in the necessary format to handle
+ * reads, writes as well as 10bit-addresses.
+ * returns:
+ * 0 everything went okay, the chip ack'ed, or IGNORE_NAK flag was set
+ * -x an error occurred (like: -ENXIO if the device did not answer, or
+ * -ETIMEDOUT, for example if the lines are stuck...)
+ */
+static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
+{
+ unsigned short flags = msg->flags;
+ unsigned short nak_ok = msg->flags & I2C_M_IGNORE_NAK;
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+
+ unsigned char addr;
+ int ret, retries;
+
+ retries = nak_ok ? 0 : i2c_adap->retries;
+
+ if (flags & I2C_M_TEN) {
+ /* a ten bit address */
+ addr = 0xf0 | ((msg->addr >> 7) & 0x06);
+ bit_dbg(2, &i2c_adap->dev, "addr0: %d\n", addr);
+ /* try extended address code...*/
+ ret = try_address(i2c_adap, addr, retries);
+ if ((ret != 1) && !nak_ok) {
+ dev_err(&i2c_adap->dev,
+ "died at extended address code\n");
+ return -ENXIO;
+ }
+ /* the remaining 8 bit address */
+ ret = i2c_outb(i2c_adap, msg->addr & 0xff);
+ if ((ret != 1) && !nak_ok) {
+ /* the chip did not ack / xmission error occurred */
+ dev_err(&i2c_adap->dev, "died at 2nd address code\n");
+ return -ENXIO;
+ }
+ if (flags & I2C_M_RD) {
+ bit_dbg(3, &i2c_adap->dev, "emitting repeated "
+ "start condition\n");
+ i2c_repstart(adap);
+ /* okay, now switch into reading mode */
+ addr |= 0x01;
+ ret = try_address(i2c_adap, addr, retries);
+ if ((ret != 1) && !nak_ok) {
+ dev_err(&i2c_adap->dev,
+ "died at repeated address code\n");
+ return -EIO;
+ }
+ }
+ } else { /* normal 7bit address */
+ addr = msg->addr << 1;
+ if (flags & I2C_M_RD)
+ addr |= 1;
+ ret = try_address(i2c_adap, addr, retries);
+ if ((ret != 1) && !nak_ok)
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+static int bit_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct i2c_msg *pmsg;
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+ int i, ret;
+ unsigned short nak_ok;
+
+ if (adap->pre_xfer) {
+ ret = adap->pre_xfer(i2c_adap);
+ if (ret < 0)
+ return ret;
+ }
+
+ bit_dbg(3, &i2c_adap->dev, "emitting start condition\n");
+ i2c_start(adap);
+ for (i = 0; i < num; i++) {
+ pmsg = &msgs[i];
+ nak_ok = pmsg->flags & I2C_M_IGNORE_NAK;
+ if (i) {
+ bit_dbg(3, &i2c_adap->dev, "emitting "
+ "repeated start condition\n");
+ i2c_repstart(adap);
+ }
+ ret = bit_doAddress(i2c_adap, pmsg);
+ if ((ret != 0) && !nak_ok) {
+ bit_dbg(1, &i2c_adap->dev, "NAK from "
+ "device addr 0x%02x msg #%d\n",
+ msgs[i].addr, i);
+ goto bailout;
+ }
+ if (pmsg->flags & I2C_M_RD) {
+ /* read bytes into buffer*/
+ ret = readbytes(i2c_adap, pmsg);
+ if (ret >= 1)
+ bit_dbg(2, &i2c_adap->dev, "read %d byte%s\n",
+ ret, ret == 1 ? "" : "s");
+ if (ret < pmsg->len) {
+ if (ret >= 0)
+ ret = -EIO;
+ goto bailout;
+ }
+ } else {
+ /* write bytes from buffer */
+ ret = sendbytes(i2c_adap, pmsg);
+ if (ret >= 1)
+ bit_dbg(2, &i2c_adap->dev, "wrote %d byte%s\n",
+ ret, ret == 1 ? "" : "s");
+ if (ret < pmsg->len) {
+ if (ret >= 0)
+ ret = -EIO;
+ goto bailout;
+ }
+ }
+ }
+ ret = i;
+
+bailout:
+ bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n");
+ i2c_stop(adap);
+
+ if (adap->post_xfer)
+ adap->post_xfer(i2c_adap);
+ return ret;
+}
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+static int __i2c_bit_add_bus(struct i2c_adapter *adap,
+ int (*add_adapter)(struct i2c_adapter *))
+{
+ struct i2c_algo_bit_data *bit_adap = adap->algo_data;
+ int ret;
+
+ if (bit_test) {
+ ret = test_bus(adap);
+ if (bit_test >= 2 && ret < 0)
+ return -ENODEV;
+ }
+
+ /* register new adapter to i2c module... */
+ //adap->algo = &i2c_bit_algo;
+ adap->retries = 3;
+ adap->master_xfer = bit_xfer;
+
+ ret = add_adapter(adap);
+ if (ret < 0)
+ return ret;
+
+ /* Complain if SCL can't be read */
+ if (bit_adap->getscl == NULL) {
+ dev_warn(&adap->dev, "Not I2C compliant: can't read SCL\n");
+ dev_warn(&adap->dev, "Bus may be unreliable\n");
+ }
+ return 0;
+}
+
+int i2c_bit_add_numbered_bus(struct i2c_adapter *adap)
+{
+ return __i2c_bit_add_bus(adap, i2c_add_numbered_adapter);
+}
+EXPORT_SYMBOL(i2c_bit_add_numbered_bus);
diff --git a/include/i2c/i2c-algo-bit.h b/include/i2c/i2c-algo-bit.h
new file mode 100644
index 0000000..1b72219
--- /dev/null
+++ b/include/i2c/i2c-algo-bit.h
@@ -0,0 +1,55 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-algo-bit.h i2c driver algorithms for bit-shift adapters */
+/* ------------------------------------------------------------------------- */
+/* Copyright (C) 1995-99 Simon G. Vogl
+
+ 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., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301 USA. */
+/* ------------------------------------------------------------------------- */
+
+/* With some changes from Kyösti Mälkki <kmalkki at cc.hut.fi> and even
+ Frodo Looijaard <frodol at dds.nl> */
+
+#ifndef _LINUX_I2C_ALGO_BIT_H
+#define _LINUX_I2C_ALGO_BIT_H
+
+/* --- Defines for bit-adapters --------------------------------------- */
+/*
+ * This struct contains the hw-dependent functions of bit-style adapters to
+ * manipulate the line states, and to init any hw-specific features. This is
+ * only used if you have more than one hw-type of adapter running.
+ */
+struct i2c_algo_bit_data {
+ void *data; /* private data for lowlevel routines */
+ void (*setsda) (void *data, int state);
+ void (*setscl) (void *data, int state);
+ int (*getsda) (void *data);
+ int (*getscl) (void *data);
+ int (*pre_xfer) (struct i2c_adapter *);
+ void (*post_xfer) (struct i2c_adapter *);
+
+ /* local settings */
+ int udelay; /* half clock cycle time in us,
+ minimum 2 us for fast-mode I2C,
+ minimum 5 us for standard-mode I2C and SMBus,
+ maximum 50 us for SMBus */
+ int timeout_ms; /* in ms */
+};
+
+int i2c_bit_add_bus(struct i2c_adapter *);
+int i2c_bit_add_numbered_bus(struct i2c_adapter *);
+extern const struct i2c_algorithm i2c_bit_algo;
+
+#endif /* _LINUX_I2C_ALGO_BIT_H */
diff --git a/include/i2c/i2c.h b/include/i2c/i2c.h
index 5021dd4..b059119 100644
--- a/include/i2c/i2c.h
+++ b/include/i2c/i2c.h
@@ -70,6 +70,8 @@ struct i2c_adapter {
int nr; /* bus number */
int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
struct list_head list;
+ int retries;
+ void *algo_data;
};
--
1.7.10.4
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