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-rw-r--r--drivers/i2c/algos/Kconfig32
-rw-r--r--drivers/i2c/algos/Makefile5
-rw-r--r--drivers/i2c/algos/i2c-algo-bit.c116
-rw-r--r--drivers/i2c/algos/i2c-algo-pca.c400
-rw-r--r--drivers/i2c/algos/i2c-algo-pca.h26
-rw-r--r--drivers/i2c/algos/i2c-algo-pcf.c325
-rw-r--r--drivers/i2c/algos/i2c-algo-pcf.h3
-rw-r--r--drivers/i2c/algos/i2c-algo-sgi.c179
8 files changed, 530 insertions, 556 deletions
diff --git a/drivers/i2c/algos/Kconfig b/drivers/i2c/algos/Kconfig
index 014dfa575be..f1cfe7e5508 100644
--- a/drivers/i2c/algos/Kconfig
+++ b/drivers/i2c/algos/Kconfig
@@ -1,45 +1,17 @@
#
-# Character device configuration
+# I2C algorithm drivers configuration
#
menu "I2C Algorithms"
+ visible if !I2C_HELPER_AUTO
config I2C_ALGOBIT
tristate "I2C bit-banging interfaces"
- help
- This allows you to use a range of I2C adapters called bit-banging
- adapters. Say Y if you own an I2C adapter belonging to this class
- and then say Y to the specific driver for you adapter below.
-
- This support is also available as a module. If so, the module
- will be called i2c-algo-bit.
config I2C_ALGOPCF
tristate "I2C PCF 8584 interfaces"
- help
- This allows you to use a range of I2C adapters called PCF adapters.
- Say Y if you own an I2C adapter belonging to this class and then say
- Y to the specific driver for you adapter below.
-
- This support is also available as a module. If so, the module
- will be called i2c-algo-pcf.
config I2C_ALGOPCA
tristate "I2C PCA 9564 interfaces"
- help
- This allows you to use a range of I2C adapters called PCA adapters.
- Say Y if you own an I2C adapter belonging to this class and then say
- Y to the specific driver for you adapter below.
-
- This support is also available as a module. If so, the module
- will be called i2c-algo-pca.
-
-config I2C_ALGO_SGI
- tristate "I2C SGI interfaces"
- depends on SGI_IP22 || SGI_IP32 || X86_VISWS
- help
- Supports the SGI interfaces like the ones found on SGI Indy VINO
- or SGI O2 MACE.
endmenu
-
diff --git a/drivers/i2c/algos/Makefile b/drivers/i2c/algos/Makefile
index cac1051bd4f..215303f60d6 100644
--- a/drivers/i2c/algos/Makefile
+++ b/drivers/i2c/algos/Makefile
@@ -5,8 +5,5 @@
obj-$(CONFIG_I2C_ALGOBIT) += i2c-algo-bit.o
obj-$(CONFIG_I2C_ALGOPCF) += i2c-algo-pcf.o
obj-$(CONFIG_I2C_ALGOPCA) += i2c-algo-pca.o
-obj-$(CONFIG_I2C_ALGO_SGI) += i2c-algo-sgi.o
-ifeq ($(CONFIG_I2C_DEBUG_ALGO),y)
-EXTRA_CFLAGS += -DDEBUG
-endif
+ccflags-$(CONFIG_I2C_DEBUG_ALGO) := -DDEBUG
diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
index 35812823787..65ef9664d5d 100644
--- a/drivers/i2c/algos/i2c-algo-bit.c
+++ b/drivers/i2c/algos/i2c-algo-bit.c
@@ -15,17 +15,16 @@
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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301 USA.
* ------------------------------------------------------------------------- */
/* With some changes from Frodo Looijaard <frodol@dds.nl>, Kyösti Mälkki
- <kmalkki@cc.hut.fi> and Jean Delvare <khali@linux-fr.org> */
+ <kmalkki@cc.hut.fi> and Jean Delvare <jdelvare@suse.de> */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/i2c.h>
@@ -48,8 +47,8 @@
/* ----- global variables --------------------------------------------- */
static int bit_test; /* see if the line-setting functions work */
-module_param(bit_test, bool, 0);
-MODULE_PARM_DESC(bit_test, "Test the lines of the bus to see if it is stuck");
+module_param(bit_test, int, S_IRUGO);
+MODULE_PARM_DESC(bit_test, "lines testing - 0 off; 1 report; 2 fail if stuck");
#ifdef DEBUG
static int i2c_debug = 1;
@@ -104,9 +103,15 @@ static int sclhi(struct i2c_algo_bit_data *adap)
* chips may hold it low ("clock stretching") while they
* are processing data internally.
*/
- if (time_after_eq(jiffies, start + adap->timeout))
+ if (time_after(jiffies, start + adap->timeout)) {
+ /* Test one last time, as we may have been preempted
+ * between last check and timeout test.
+ */
+ if (getscl(adap))
+ break;
return -ETIMEDOUT;
- cond_resched();
+ }
+ cpu_relax();
}
#ifdef DEBUG
if (jiffies != start && i2c_debug >= 3)
@@ -233,9 +238,17 @@ static int i2c_inb(struct i2c_adapter *i2c_adap)
* 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_algo_bit_data *adap, char *name)
+static int test_bus(struct i2c_adapter *i2c_adap)
{
- int scl, sda;
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+ const char *name = i2c_adap->name;
+ int scl, sda, ret;
+
+ if (adap->pre_xfer) {
+ ret = adap->pre_xfer(i2c_adap);
+ if (ret < 0)
+ return -ENODEV;
+ }
if (adap->getscl == NULL)
pr_info("%s: Testing SDA only, SCL is not readable\n", name);
@@ -243,7 +256,9 @@ static int test_bus(struct i2c_algo_bit_data *adap, char *name)
sda = getsda(adap);
scl = (adap->getscl == NULL) ? 1 : getscl(adap);
if (!scl || !sda) {
- printk(KERN_WARNING "%s: bus seems to be busy\n", name);
+ printk(KERN_WARNING
+ "%s: bus seems to be busy (scl=%d, sda=%d)\n",
+ name, scl, sda);
goto bailout;
}
@@ -298,11 +313,19 @@ static int test_bus(struct i2c_algo_bit_data *adap, char *name)
"while pulling SCL high!\n", name);
goto bailout;
}
+
+ if (adap->post_xfer)
+ adap->post_xfer(i2c_adap);
+
pr_info("%s: Test OK\n", name);
return 0;
bailout:
sdahi(adap);
sclhi(adap);
+
+ if (adap->post_xfer)
+ adap->post_xfer(i2c_adap);
+
return -ENODEV;
}
@@ -320,7 +343,7 @@ 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 = -1;
+ int i, ret = 0;
for (i = 0; i <= retries; i++) {
ret = i2c_outb(i2c_adap, addr);
@@ -426,7 +449,7 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
acknak(i2c_adap, 0);
dev_err(&i2c_adap->dev, "readbytes: invalid "
"block length (%d)\n", inval);
- return -EREMOTEIO;
+ return -EPROTO;
}
/* The original count value accounts for the extra
bytes, that is, either 1 for a regular transaction,
@@ -455,7 +478,7 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
* 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: -EREMOTEIO if the device did not answer, or
+ * -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)
@@ -471,21 +494,21 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
if (flags & I2C_M_TEN) {
/* a ten bit address */
- addr = 0xf0 | ((msg->addr >> 7) & 0x03);
+ 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 -EREMOTEIO;
+ return -ENXIO;
}
/* the remaining 8 bit address */
- ret = i2c_outb(i2c_adap, msg->addr & 0x7f);
+ 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 -EREMOTEIO;
+ return -ENXIO;
}
if (flags & I2C_M_RD) {
bit_dbg(3, &i2c_adap->dev, "emitting repeated "
@@ -497,7 +520,7 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
if ((ret != 1) && !nak_ok) {
dev_err(&i2c_adap->dev,
"died at repeated address code\n");
- return -EREMOTEIO;
+ return -EIO;
}
}
} else { /* normal 7bit address */
@@ -508,7 +531,7 @@ static int bit_doAddress(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
addr ^= 1;
ret = try_address(i2c_adap, addr, retries);
if ((ret != 1) && !nak_ok)
- return -EREMOTEIO;
+ return -ENXIO;
}
return 0;
@@ -522,6 +545,12 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
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++) {
@@ -549,7 +578,7 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
ret, ret == 1 ? "" : "s");
if (ret < pmsg->len) {
if (ret >= 0)
- ret = -EREMOTEIO;
+ ret = -EIO;
goto bailout;
}
} else {
@@ -560,7 +589,7 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
ret, ret == 1 ? "" : "s");
if (ret < pmsg->len) {
if (ret >= 0)
- ret = -EREMOTEIO;
+ ret = -EIO;
goto bailout;
}
}
@@ -570,12 +599,15 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
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;
}
static u32 bit_func(struct i2c_adapter *adap)
{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
+ return I2C_FUNC_I2C | I2C_FUNC_NOSTART | I2C_FUNC_SMBUS_EMUL |
I2C_FUNC_SMBUS_READ_BLOCK_DATA |
I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
@@ -584,54 +616,52 @@ static u32 bit_func(struct i2c_adapter *adap)
/* -----exported algorithm data: ------------------------------------- */
-static const struct i2c_algorithm i2c_bit_algo = {
+const struct i2c_algorithm i2c_bit_algo = {
.master_xfer = bit_xfer,
.functionality = bit_func,
};
+EXPORT_SYMBOL(i2c_bit_algo);
/*
* registering functions to load algorithms at runtime
*/
-static int i2c_bit_prepare_bus(struct i2c_adapter *adap)
+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) {
- int ret = test_bus(bit_adap, adap->name);
- if (ret < 0)
+ 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->timeout = 100; /* default values, should */
- adap->retries = 3; /* be replaced by defines */
+ 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_bus(struct i2c_adapter *adap)
{
- int err;
-
- err = i2c_bit_prepare_bus(adap);
- if (err)
- return err;
-
- return i2c_add_adapter(adap);
+ return __i2c_bit_add_bus(adap, i2c_add_adapter);
}
EXPORT_SYMBOL(i2c_bit_add_bus);
int i2c_bit_add_numbered_bus(struct i2c_adapter *adap)
{
- int err;
-
- err = i2c_bit_prepare_bus(adap);
- if (err)
- return err;
-
- return i2c_add_numbered_adapter(adap);
+ return __i2c_bit_add_bus(adap, i2c_add_numbered_adapter);
}
EXPORT_SYMBOL(i2c_bit_add_numbered_bus);
diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
index 2a16211f12e..8b10f88b13d 100644
--- a/drivers/i2c/algos/i2c-algo-pca.c
+++ b/drivers/i2c/algos/i2c-algo-pca.c
@@ -1,6 +1,7 @@
/*
- * i2c-algo-pca.c i2c driver algorithms for PCA9564 adapters
+ * i2c-algo-pca.c i2c driver algorithms for PCA9564 adapters
* Copyright (C) 2004 Arcom Control Systems
+ * Copyright (C) 2008 Pengutronix
*
* 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
@@ -14,51 +15,64 @@
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/init.h>
+#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pca.h>
-#include "i2c-algo-pca.h"
-#define DRIVER "i2c-algo-pca"
-
-#define DEB1(fmt, args...) do { if (i2c_debug>=1) printk(fmt, ## args); } while(0)
-#define DEB2(fmt, args...) do { if (i2c_debug>=2) printk(fmt, ## args); } while(0)
-#define DEB3(fmt, args...) do { if (i2c_debug>=3) printk(fmt, ## args); } while(0)
+#define DEB1(fmt, args...) do { if (i2c_debug >= 1) \
+ printk(KERN_DEBUG fmt, ## args); } while (0)
+#define DEB2(fmt, args...) do { if (i2c_debug >= 2) \
+ printk(KERN_DEBUG fmt, ## args); } while (0)
+#define DEB3(fmt, args...) do { if (i2c_debug >= 3) \
+ printk(KERN_DEBUG fmt, ## args); } while (0)
static int i2c_debug;
-#define pca_outw(adap, reg, val) adap->write_byte(adap, reg, val)
-#define pca_inw(adap, reg) adap->read_byte(adap, reg)
+#define pca_outw(adap, reg, val) adap->write_byte(adap->data, reg, val)
+#define pca_inw(adap, reg) adap->read_byte(adap->data, reg)
#define pca_status(adap) pca_inw(adap, I2C_PCA_STA)
-#define pca_clock(adap) adap->get_clock(adap)
-#define pca_own(adap) adap->get_own(adap)
+#define pca_clock(adap) adap->i2c_clock
#define pca_set_con(adap, val) pca_outw(adap, I2C_PCA_CON, val)
#define pca_get_con(adap) pca_inw(adap, I2C_PCA_CON)
-#define pca_wait(adap) adap->wait_for_interrupt(adap)
+#define pca_wait(adap) adap->wait_for_completion(adap->data)
+
+static void pca_reset(struct i2c_algo_pca_data *adap)
+{
+ if (adap->chip == I2C_PCA_CHIP_9665) {
+ /* Ignore the reset function from the module,
+ * we can use the parallel bus reset.
+ */
+ pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_IPRESET);
+ pca_outw(adap, I2C_PCA_IND, 0xA5);
+ pca_outw(adap, I2C_PCA_IND, 0x5A);
+ } else {
+ adap->reset_chip(adap->data);
+ }
+}
/*
* Generate a start condition on the i2c bus.
*
* returns after the start condition has occurred
*/
-static void pca_start(struct i2c_algo_pca_data *adap)
+static int pca_start(struct i2c_algo_pca_data *adap)
{
int sta = pca_get_con(adap);
DEB2("=== START\n");
sta |= I2C_PCA_CON_STA;
sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_SI);
pca_set_con(adap, sta);
- pca_wait(adap);
+ return pca_wait(adap);
}
/*
@@ -66,14 +80,14 @@ static void pca_start(struct i2c_algo_pca_data *adap)
*
* return after the repeated start condition has occurred
*/
-static void pca_repeated_start(struct i2c_algo_pca_data *adap)
+static int pca_repeated_start(struct i2c_algo_pca_data *adap)
{
int sta = pca_get_con(adap);
DEB2("=== REPEATED START\n");
sta |= I2C_PCA_CON_STA;
sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_SI);
pca_set_con(adap, sta);
- pca_wait(adap);
+ return pca_wait(adap);
}
/*
@@ -99,24 +113,24 @@ static void pca_stop(struct i2c_algo_pca_data *adap)
*
* returns after the address has been sent
*/
-static void pca_address(struct i2c_algo_pca_data *adap,
- struct i2c_msg *msg)
+static int pca_address(struct i2c_algo_pca_data *adap,
+ struct i2c_msg *msg)
{
int sta = pca_get_con(adap);
int addr;
- addr = ( (0x7f & msg->addr) << 1 );
- if (msg->flags & I2C_M_RD )
+ addr = ((0x7f & msg->addr) << 1);
+ if (msg->flags & I2C_M_RD)
addr |= 1;
- DEB2("=== SLAVE ADDRESS %#04x+%c=%#04x\n",
+ DEB2("=== SLAVE ADDRESS %#04x+%c=%#04x\n",
msg->addr, msg->flags & I2C_M_RD ? 'R' : 'W', addr);
-
+
pca_outw(adap, I2C_PCA_DAT, addr);
sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI);
pca_set_con(adap, sta);
- pca_wait(adap);
+ return pca_wait(adap);
}
/*
@@ -124,8 +138,8 @@ static void pca_address(struct i2c_algo_pca_data *adap,
*
* Returns after the byte has been transmitted
*/
-static void pca_tx_byte(struct i2c_algo_pca_data *adap,
- __u8 b)
+static int pca_tx_byte(struct i2c_algo_pca_data *adap,
+ __u8 b)
{
int sta = pca_get_con(adap);
DEB2("=== WRITE %#04x\n", b);
@@ -134,7 +148,7 @@ static void pca_tx_byte(struct i2c_algo_pca_data *adap,
sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI);
pca_set_con(adap, sta);
- pca_wait(adap);
+ return pca_wait(adap);
}
/*
@@ -142,78 +156,72 @@ static void pca_tx_byte(struct i2c_algo_pca_data *adap,
*
* returns immediately.
*/
-static void pca_rx_byte(struct i2c_algo_pca_data *adap,
+static void pca_rx_byte(struct i2c_algo_pca_data *adap,
__u8 *b, int ack)
{
*b = pca_inw(adap, I2C_PCA_DAT);
DEB2("=== READ %#04x %s\n", *b, ack ? "ACK" : "NACK");
}
-/*
+/*
* Setup ACK or NACK for next received byte and wait for it to arrive.
*
* Returns after next byte has arrived.
*/
-static void pca_rx_ack(struct i2c_algo_pca_data *adap,
- int ack)
+static int pca_rx_ack(struct i2c_algo_pca_data *adap,
+ int ack)
{
int sta = pca_get_con(adap);
sta &= ~(I2C_PCA_CON_STO|I2C_PCA_CON_STA|I2C_PCA_CON_SI|I2C_PCA_CON_AA);
- if ( ack )
+ if (ack)
sta |= I2C_PCA_CON_AA;
pca_set_con(adap, sta);
- pca_wait(adap);
-}
-
-/*
- * Reset the i2c bus / SIO
- */
-static void pca_reset(struct i2c_algo_pca_data *adap)
-{
- /* apparently only an external reset will do it. not a lot can be done */
- printk(KERN_ERR DRIVER ": Haven't figured out how to do a reset yet\n");
+ return pca_wait(adap);
}
static int pca_xfer(struct i2c_adapter *i2c_adap,
- struct i2c_msg *msgs,
- int num)
+ struct i2c_msg *msgs,
+ int num)
{
- struct i2c_algo_pca_data *adap = i2c_adap->algo_data;
- struct i2c_msg *msg = NULL;
- int curmsg;
+ struct i2c_algo_pca_data *adap = i2c_adap->algo_data;
+ struct i2c_msg *msg = NULL;
+ int curmsg;
int numbytes = 0;
int state;
int ret;
- int timeout = 100;
-
- while ((state = pca_status(adap)) != 0xf8 && timeout--) {
- msleep(10);
- }
- if (state != 0xf8) {
- dev_dbg(&i2c_adap->dev, "bus is not idle. status is %#04x\n", state);
- return -EIO;
+ int completed = 1;
+ unsigned long timeout = jiffies + i2c_adap->timeout;
+
+ while ((state = pca_status(adap)) != 0xf8) {
+ if (time_before(jiffies, timeout)) {
+ msleep(10);
+ } else {
+ dev_dbg(&i2c_adap->dev, "bus is not idle. status is "
+ "%#04x\n", state);
+ return -EBUSY;
+ }
}
DEB1("{{{ XFER %d messages\n", num);
- if (i2c_debug>=2) {
+ if (i2c_debug >= 2) {
for (curmsg = 0; curmsg < num; curmsg++) {
int addr, i;
msg = &msgs[curmsg];
-
+
addr = (0x7f & msg->addr) ;
-
- if (msg->flags & I2C_M_RD )
- printk(KERN_INFO " [%02d] RD %d bytes from %#02x [%#02x, ...]\n",
- curmsg, msg->len, addr, (addr<<1) | 1);
+
+ if (msg->flags & I2C_M_RD)
+ printk(KERN_INFO " [%02d] RD %d bytes from %#02x [%#02x, ...]\n",
+ curmsg, msg->len, addr, (addr << 1) | 1);
else {
- printk(KERN_INFO " [%02d] WR %d bytes to %#02x [%#02x%s",
- curmsg, msg->len, addr, addr<<1,
+ printk(KERN_INFO " [%02d] WR %d bytes to %#02x [%#02x%s",
+ curmsg, msg->len, addr, addr << 1,
msg->len == 0 ? "" : ", ");
- for(i=0; i < msg->len; i++)
+ for (i = 0; i < msg->len; i++)
printk("%#04x%s", msg->buf[i], i == msg->len - 1 ? "" : ", ");
printk("]\n");
}
@@ -221,7 +229,7 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
}
curmsg = 0;
- ret = -EREMOTEIO;
+ ret = -EIO;
while (curmsg < num) {
state = pca_status(adap);
@@ -230,18 +238,19 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
switch (state) {
case 0xf8: /* On reset or stop the bus is idle */
- pca_start(adap);
+ completed = pca_start(adap);
break;
case 0x08: /* A START condition has been transmitted */
case 0x10: /* A repeated start condition has been transmitted */
- pca_address(adap, msg);
+ completed = pca_address(adap, msg);
break;
-
+
case 0x18: /* SLA+W has been transmitted; ACK has been received */
case 0x28: /* Data byte in I2CDAT has been transmitted; ACK has been received */
if (numbytes < msg->len) {
- pca_tx_byte(adap, msg->buf[numbytes]);
+ completed = pca_tx_byte(adap,
+ msg->buf[numbytes]);
numbytes++;
break;
}
@@ -249,53 +258,67 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
if (curmsg == num)
pca_stop(adap);
else
- pca_repeated_start(adap);
+ completed = pca_repeated_start(adap);
break;
case 0x20: /* SLA+W has been transmitted; NOT ACK has been received */
DEB2("NOT ACK received after SLA+W\n");
pca_stop(adap);
+ ret = -ENXIO;
goto out;
case 0x40: /* SLA+R has been transmitted; ACK has been received */
- pca_rx_ack(adap, msg->len > 1);
+ completed = pca_rx_ack(adap, msg->len > 1);
break;
case 0x50: /* Data bytes has been received; ACK has been returned */
if (numbytes < msg->len) {
pca_rx_byte(adap, &msg->buf[numbytes], 1);
numbytes++;
- pca_rx_ack(adap, numbytes < msg->len - 1);
+ completed = pca_rx_ack(adap,
+ numbytes < msg->len - 1);
break;
}
curmsg++; numbytes = 0;
if (curmsg == num)
pca_stop(adap);
else
- pca_repeated_start(adap);
+ completed = pca_repeated_start(adap);
break;
case 0x48: /* SLA+R has been transmitted; NOT ACK has been received */
DEB2("NOT ACK received after SLA+R\n");
pca_stop(adap);
+ ret = -ENXIO;
goto out;
case 0x30: /* Data byte in I2CDAT has been transmitted; NOT ACK has been received */
DEB2("NOT ACK received after data byte\n");
+ pca_stop(adap);
goto out;
case 0x38: /* Arbitration lost during SLA+W, SLA+R or data bytes */
DEB2("Arbitration lost\n");
+ /*
+ * The PCA9564 data sheet (2006-09-01) says "A
+ * START condition will be transmitted when the
+ * bus becomes free (STOP or SCL and SDA high)"
+ * when the STA bit is set (p. 11).
+ *
+ * In case this won't work, try pca_reset()
+ * instead.
+ */
+ pca_start(adap);
goto out;
-
+
case 0x58: /* Data byte has been received; NOT ACK has been returned */
- if ( numbytes == msg->len - 1 ) {
+ if (numbytes == msg->len - 1) {
pca_rx_byte(adap, &msg->buf[numbytes], 0);
curmsg++; numbytes = 0;
if (curmsg == num)
pca_stop(adap);
else
- pca_repeated_start(adap);
+ completed = pca_repeated_start(adap);
} else {
DEB2("NOT ACK sent after data byte received. "
"Not final byte. numbytes %d. len %d\n",
@@ -317,16 +340,18 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
pca_reset(adap);
goto out;
default:
- printk(KERN_ERR DRIVER ": unhandled SIO state 0x%02x\n", state);
+ dev_err(&i2c_adap->dev, "unhandled SIO state 0x%02x\n", state);
break;
}
-
+
+ if (!completed)
+ goto out;
}
ret = curmsg;
out:
- DEB1(KERN_CRIT "}}} transfered %d/%d messages. "
- "status is %#04x. control is %#04x\n",
+ DEB1("}}} transferred %d/%d messages. "
+ "status is %#04x. control is %#04x\n",
curmsg, num, pca_status(adap),
pca_get_con(adap));
return ret;
@@ -334,57 +359,208 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
static u32 pca_func(struct i2c_adapter *adap)
{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
-static int pca_init(struct i2c_algo_pca_data *adap)
+static const struct i2c_algorithm pca_algo = {
+ .master_xfer = pca_xfer,
+ .functionality = pca_func,
+};
+
+static unsigned int pca_probe_chip(struct i2c_adapter *adap)
{
- static int freqs[] = {330,288,217,146,88,59,44,36};
- int own, clock;
+ struct i2c_algo_pca_data *pca_data = adap->algo_data;
+ /* The trick here is to check if there is an indirect register
+ * available. If there is one, we will read the value we first
+ * wrote on I2C_PCA_IADR. Otherwise, we will read the last value
+ * we wrote on I2C_PCA_ADR
+ */
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
+ pca_outw(pca_data, I2C_PCA_IND, 0xAA);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ITO);
+ pca_outw(pca_data, I2C_PCA_IND, 0x00);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IADR);
+ if (pca_inw(pca_data, I2C_PCA_IND) == 0xAA) {
+ printk(KERN_INFO "%s: PCA9665 detected.\n", adap->name);
+ pca_data->chip = I2C_PCA_CHIP_9665;
+ } else {
+ printk(KERN_INFO "%s: PCA9564 detected.\n", adap->name);
+ pca_data->chip = I2C_PCA_CHIP_9564;
+ }
+ return pca_data->chip;
+}
- own = pca_own(adap);
- clock = pca_clock(adap);
- DEB1(KERN_INFO DRIVER ": own address is %#04x\n", own);
- DEB1(KERN_INFO DRIVER ": clock freqeuncy is %dkHz\n", freqs[clock]);
+static int pca_init(struct i2c_adapter *adap)
+{
+ struct i2c_algo_pca_data *pca_data = adap->algo_data;
- pca_outw(adap, I2C_PCA_ADR, own << 1);
+ adap->algo = &pca_algo;
- pca_set_con(adap, I2C_PCA_CON_ENSIO | clock);
- udelay(500); /* 500 µs for oscilator to stabilise */
+ if (pca_probe_chip(adap) == I2C_PCA_CHIP_9564) {
+ static int freqs[] = {330, 288, 217, 146, 88, 59, 44, 36};
+ int clock;
+
+ if (pca_data->i2c_clock > 7) {
+ switch (pca_data->i2c_clock) {
+ case 330000:
+ pca_data->i2c_clock = I2C_PCA_CON_330kHz;
+ break;
+ case 288000:
+ pca_data->i2c_clock = I2C_PCA_CON_288kHz;
+ break;
+ case 217000:
+ pca_data->i2c_clock = I2C_PCA_CON_217kHz;
+ break;
+ case 146000:
+ pca_data->i2c_clock = I2C_PCA_CON_146kHz;
+ break;
+ case 88000:
+ pca_data->i2c_clock = I2C_PCA_CON_88kHz;
+ break;
+ case 59000:
+ pca_data->i2c_clock = I2C_PCA_CON_59kHz;
+ break;
+ case 44000:
+ pca_data->i2c_clock = I2C_PCA_CON_44kHz;
+ break;
+ case 36000:
+ pca_data->i2c_clock = I2C_PCA_CON_36kHz;
+ break;
+ default:
+ printk(KERN_WARNING
+ "%s: Invalid I2C clock speed selected."
+ " Using default 59kHz.\n", adap->name);
+ pca_data->i2c_clock = I2C_PCA_CON_59kHz;
+ }
+ } else {
+ printk(KERN_WARNING "%s: "
+ "Choosing the clock frequency based on "
+ "index is deprecated."
+ " Use the nominal frequency.\n", adap->name);
+ }
+
+ pca_reset(pca_data);
+
+ clock = pca_clock(pca_data);
+ printk(KERN_INFO "%s: Clock frequency is %dkHz\n",
+ adap->name, freqs[clock]);
+
+ pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock);
+ } else {
+ int clock;
+ int mode;
+ int tlow, thi;
+ /* Values can be found on PCA9665 datasheet section 7.3.2.6 */
+ int min_tlow, min_thi;
+ /* These values are the maximum raise and fall values allowed
+ * by the I2C operation mode (Standard, Fast or Fast+)
+ * They are used (added) below to calculate the clock dividers
+ * of PCA9665. Note that they are slightly different of the
+ * real maximum, to allow the change on mode exactly on the
+ * maximum clock rate for each mode
+ */
+ int raise_fall_time;
+
+ if (pca_data->i2c_clock > 1265800) {
+ printk(KERN_WARNING "%s: I2C clock speed too high."
+ " Using 1265.8kHz.\n", adap->name);
+ pca_data->i2c_clock = 1265800;
+ }
+
+ if (pca_data->i2c_clock < 60300) {
+ printk(KERN_WARNING "%s: I2C clock speed too low."
+ " Using 60.3kHz.\n", adap->name);
+ pca_data->i2c_clock = 60300;
+ }
+
+ /* To avoid integer overflow, use clock/100 for calculations */
+ clock = pca_clock(pca_data) / 100;
+
+ if (pca_data->i2c_clock > 1000000) {
+ mode = I2C_PCA_MODE_TURBO;
+ min_tlow = 14;
+ min_thi = 5;
+ raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
+ } else if (pca_data->i2c_clock > 400000) {
+ mode = I2C_PCA_MODE_FASTP;
+ min_tlow = 17;
+ min_thi = 9;
+ raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
+ } else if (pca_data->i2c_clock > 100000) {
+ mode = I2C_PCA_MODE_FAST;
+ min_tlow = 44;
+ min_thi = 20;
+ raise_fall_time = 58; /* Raise 29e-8s, Fall 29e-8s */
+ } else {
+ mode = I2C_PCA_MODE_STD;
+ min_tlow = 157;
+ min_thi = 134;
+ raise_fall_time = 127; /* Raise 29e-8s, Fall 98e-8s */
+ }
+
+ /* The minimum clock that respects the thi/tlow = 134/157 is
+ * 64800 Hz. Below that, we have to fix the tlow to 255 and
+ * calculate the thi factor.
+ */
+ if (clock < 648) {
+ tlow = 255;
+ thi = 1000000 - clock * raise_fall_time;
+ thi /= (I2C_PCA_OSC_PER * clock) - tlow;
+ } else {
+ tlow = (1000000 - clock * raise_fall_time) * min_tlow;
+ tlow /= I2C_PCA_OSC_PER * clock * (min_thi + min_tlow);
+ thi = tlow * min_thi / min_tlow;
+ }
+
+ pca_reset(pca_data);
+
+ printk(KERN_INFO
+ "%s: Clock frequency is %dHz\n", adap->name, clock * 100);
+
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IMODE);
+ pca_outw(pca_data, I2C_PCA_IND, mode);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLL);
+ pca_outw(pca_data, I2C_PCA_IND, tlow);
+ pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLH);
+ pca_outw(pca_data, I2C_PCA_IND, thi);
+
+ pca_set_con(pca_data, I2C_PCA_CON_ENSIO);
+ }
+ udelay(500); /* 500 us for oscilator to stabilise */
return 0;
}
-static const struct i2c_algorithm pca_algo = {
- .master_xfer = pca_xfer,
- .functionality = pca_func,
-};
-
-/*
- * registering functions to load algorithms at runtime
+/*
+ * registering functions to load algorithms at runtime
*/
int i2c_pca_add_bus(struct i2c_adapter *adap)
{
- struct i2c_algo_pca_data *pca_adap = adap->algo_data;
int rval;
- /* register new adapter to i2c module... */
- adap->algo = &pca_algo;
+ rval = pca_init(adap);
+ if (rval)
+ return rval;
- adap->timeout = 100; /* default values, should */
- adap->retries = 3; /* be replaced by defines */
+ return i2c_add_adapter(adap);
+}
+EXPORT_SYMBOL(i2c_pca_add_bus);
- if ((rval = pca_init(pca_adap)))
- return rval;
+int i2c_pca_add_numbered_bus(struct i2c_adapter *adap)
+{
+ int rval;
- rval = i2c_add_adapter(adap);
+ rval = pca_init(adap);
+ if (rval)
+ return rval;
- return rval;
+ return i2c_add_numbered_adapter(adap);
}
-EXPORT_SYMBOL(i2c_pca_add_bus);
+EXPORT_SYMBOL(i2c_pca_add_numbered_bus);
-MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
-MODULE_DESCRIPTION("I2C-Bus PCA9564 algorithm");
+MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>, "
+ "Wolfram Sang <w.sang@pengutronix.de>");
+MODULE_DESCRIPTION("I2C-Bus PCA9564/PCA9665 algorithm");
MODULE_LICENSE("GPL");
module_param(i2c_debug, int, 0);
diff --git a/drivers/i2c/algos/i2c-algo-pca.h b/drivers/i2c/algos/i2c-algo-pca.h
deleted file mode 100644
index 2fee07e0521..00000000000
--- a/drivers/i2c/algos/i2c-algo-pca.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#ifndef I2C_PCA9564_H
-#define I2C_PCA9564_H 1
-
-#define I2C_PCA_STA 0x00 /* STATUS Read Only */
-#define I2C_PCA_TO 0x00 /* TIMEOUT Write Only */
-#define I2C_PCA_DAT 0x01 /* DATA Read/Write */
-#define I2C_PCA_ADR 0x02 /* OWN ADR Read/Write */
-#define I2C_PCA_CON 0x03 /* CONTROL Read/Write */
-
-#define I2C_PCA_CON_AA 0x80 /* Assert Acknowledge */
-#define I2C_PCA_CON_ENSIO 0x40 /* Enable */
-#define I2C_PCA_CON_STA 0x20 /* Start */
-#define I2C_PCA_CON_STO 0x10 /* Stop */
-#define I2C_PCA_CON_SI 0x08 /* Serial Interrupt */
-#define I2C_PCA_CON_CR 0x07 /* Clock Rate (MASK) */
-
-#define I2C_PCA_CON_330kHz 0x00
-#define I2C_PCA_CON_288kHz 0x01
-#define I2C_PCA_CON_217kHz 0x02
-#define I2C_PCA_CON_146kHz 0x03
-#define I2C_PCA_CON_88kHz 0x04
-#define I2C_PCA_CON_59kHz 0x05
-#define I2C_PCA_CON_44kHz 0x06
-#define I2C_PCA_CON_36kHz 0x07
-
-#endif /* I2C_PCA9564_H */
diff --git a/drivers/i2c/algos/i2c-algo-pcf.c b/drivers/i2c/algos/i2c-algo-pcf.c
index 8907b019167..34370090b75 100644
--- a/drivers/i2c/algos/i2c-algo-pcf.c
+++ b/drivers/i2c/algos/i2c-algo-pcf.c
@@ -1,54 +1,53 @@
-/* ------------------------------------------------------------------------- */
-/* i2c-algo-pcf.c i2c driver algorithms for PCF8584 adapters */
-/* ------------------------------------------------------------------------- */
-/* Copyright (C) 1995-1997 Simon G. Vogl
- 1998-2000 Hans Berglund
-
- 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-/* ------------------------------------------------------------------------- */
-
-/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
- Frodo Looijaard <frodol@dds.nl> ,and also from Martin Bailey
- <mbailey@littlefeet-inc.com> */
-
-/* Partially rewriten by Oleg I. Vdovikin <vdovikin@jscc.ru> to handle multiple
- messages, proper stop/repstart signaling during receive,
- added detect code */
+/*
+ * i2c-algo-pcf.c i2c driver algorithms for PCF8584 adapters
+ *
+ * Copyright (C) 1995-1997 Simon G. Vogl
+ * 1998-2000 Hans Berglund
+ *
+ * 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@cc.hut.fi> and
+ * Frodo Looijaard <frodol@dds.nl>, and also from Martin Bailey
+ * <mbailey@littlefeet-inc.com>
+ *
+ * Partially rewriten by Oleg I. Vdovikin <vdovikin@jscc.ru> to handle multiple
+ * messages, proper stop/repstart signaling during receive, added detect code
+ */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/init.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pcf.h>
#include "i2c-algo-pcf.h"
-#define DEB2(x) if (i2c_debug>=2) x
-#define DEB3(x) if (i2c_debug>=3) x /* print several statistical values*/
-#define DEBPROTO(x) if (i2c_debug>=9) x;
- /* debug the protocol by showing transferred bits */
+#define DEB2(x) if (i2c_debug >= 2) x
+#define DEB3(x) if (i2c_debug >= 3) x /* print several statistical values */
+#define DEBPROTO(x) if (i2c_debug >= 9) x;
+ /* debug the protocol by showing transferred bits */
#define DEF_TIMEOUT 16
-/* module parameters:
+/*
+ * module parameters:
*/
static int i2c_debug;
-/* --- setting states on the bus with the right timing: --------------- */
+/* setting states on the bus with the right timing: */
#define set_pcf(adap, ctl, val) adap->setpcf(adap->data, ctl, val)
#define get_pcf(adap, ctl) adap->getpcf(adap->data, ctl)
@@ -57,85 +56,100 @@ static int i2c_debug;
#define i2c_outb(adap, val) adap->setpcf(adap->data, 0, val)
#define i2c_inb(adap) adap->getpcf(adap->data, 0)
-/* --- other auxiliary functions -------------------------------------- */
+/* other auxiliary functions */
-static void i2c_start(struct i2c_algo_pcf_data *adap)
+static void i2c_start(struct i2c_algo_pcf_data *adap)
{
- DEBPROTO(printk("S "));
+ DEBPROTO(printk(KERN_DEBUG "S "));
set_pcf(adap, 1, I2C_PCF_START);
}
-static void i2c_repstart(struct i2c_algo_pcf_data *adap)
+static void i2c_repstart(struct i2c_algo_pcf_data *adap)
{
DEBPROTO(printk(" Sr "));
set_pcf(adap, 1, I2C_PCF_REPSTART);
}
-
-static void i2c_stop(struct i2c_algo_pcf_data *adap)
+static void i2c_stop(struct i2c_algo_pcf_data *adap)
{
DEBPROTO(printk("P\n"));
set_pcf(adap, 1, I2C_PCF_STOP);
}
-static int wait_for_bb(struct i2c_algo_pcf_data *adap) {
+static void handle_lab(struct i2c_algo_pcf_data *adap, const int *status)
+{
+ DEB2(printk(KERN_INFO
+ "i2c-algo-pcf.o: lost arbitration (CSR 0x%02x)\n",
+ *status));
+ /*
+ * Cleanup from LAB -- reset and enable ESO.
+ * This resets the PCF8584; since we've lost the bus, no
+ * further attempts should be made by callers to clean up
+ * (no i2c_stop() etc.)
+ */
+ set_pcf(adap, 1, I2C_PCF_PIN);
+ set_pcf(adap, 1, I2C_PCF_ESO);
+ /*
+ * We pause for a time period sufficient for any running
+ * I2C transaction to complete -- the arbitration logic won't
+ * work properly until the next START is seen.
+ * It is assumed the bus driver or client has set a proper value.
+ *
+ * REVISIT: should probably use msleep instead of mdelay if we
+ * know we can sleep.
+ */
+ if (adap->lab_mdelay)
+ mdelay(adap->lab_mdelay);
+
+ DEB2(printk(KERN_INFO
+ "i2c-algo-pcf.o: reset LAB condition (CSR 0x%02x)\n",
+ get_pcf(adap, 1)));
+}
+
+static int wait_for_bb(struct i2c_algo_pcf_data *adap)
+{
int timeout = DEF_TIMEOUT;
int status;
status = get_pcf(adap, 1);
-#ifndef STUB_I2C
- while (timeout-- && !(status & I2C_PCF_BB)) {
+
+ while (!(status & I2C_PCF_BB) && --timeout) {
udelay(100); /* wait for 100 us */
status = get_pcf(adap, 1);
}
-#endif
- if (timeout <= 0) {
+
+ if (timeout == 0) {
printk(KERN_ERR "Timeout waiting for Bus Busy\n");
+ return -ETIMEDOUT;
}
-
- return (timeout<=0);
-}
+ return 0;
+}
-static int wait_for_pin(struct i2c_algo_pcf_data *adap, int *status) {
+static int wait_for_pin(struct i2c_algo_pcf_data *adap, int *status)
+{
int timeout = DEF_TIMEOUT;
*status = get_pcf(adap, 1);
-#ifndef STUB_I2C
- while (timeout-- && (*status & I2C_PCF_PIN)) {
- adap->waitforpin();
+
+ while ((*status & I2C_PCF_PIN) && --timeout) {
+ adap->waitforpin(adap->data);
*status = get_pcf(adap, 1);
}
if (*status & I2C_PCF_LAB) {
- DEB2(printk(KERN_INFO
- "i2c-algo-pcf.o: lost arbitration (CSR 0x%02x)\n",
- *status));
- /* Cleanup from LAB-- reset and enable ESO.
- * This resets the PCF8584; since we've lost the bus, no
- * further attempts should be made by callers to clean up
- * (no i2c_stop() etc.)
- */
- set_pcf(adap, 1, I2C_PCF_PIN);
- set_pcf(adap, 1, I2C_PCF_ESO);
- /* TODO: we should pause for a time period sufficient for any
- * running I2C transaction to complete-- the arbitration
- * logic won't work properly until the next START is seen.
- */
- DEB2(printk(KERN_INFO
- "i2c-algo-pcf.o: reset LAB condition (CSR 0x%02x)\n",
- get_pcf(adap,1)));
- return(-EINTR);
+ handle_lab(adap, status);
+ return -EINTR;
}
-#endif
- if (timeout <= 0)
- return(-1);
- else
- return(0);
+
+ if (timeout == 0)
+ return -ETIMEDOUT;
+
+ return 0;
}
-/*
+/*
* This should perform the 'PCF8584 initialization sequence' as described
* in the Philips IC12 data book (1995, Aug 29).
* There should be a 30 clock cycle wait after reset, I assume this
@@ -150,18 +164,21 @@ static int pcf_init_8584 (struct i2c_algo_pcf_data *adap)
{
unsigned char temp;
- DEB3(printk(KERN_DEBUG "i2c-algo-pcf.o: PCF state 0x%02x\n", get_pcf(adap, 1)));
+ DEB3(printk(KERN_DEBUG "i2c-algo-pcf.o: PCF state 0x%02x\n",
+ get_pcf(adap, 1)));
/* S1=0x80: S0 selected, serial interface off */
set_pcf(adap, 1, I2C_PCF_PIN);
- /* check to see S1 now used as R/W ctrl -
- PCF8584 does that when ESO is zero */
+ /*
+ * check to see S1 now used as R/W ctrl -
+ * PCF8584 does that when ESO is zero
+ */
if (((temp = get_pcf(adap, 1)) & 0x7f) != (0)) {
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S0 (0x%02x).\n", temp));
- return -ENXIO; /* definetly not PCF8584 */
+ return -ENXIO; /* definitely not PCF8584 */
}
- /* load own address in S0, effective address is (own << 1) */
+ /* load own address in S0, effective address is (own << 1) */
i2c_outb(adap, get_own(adap));
/* check it's really written */
if ((temp = i2c_inb(adap)) != get_own(adap)) {
@@ -169,7 +186,7 @@ static int pcf_init_8584 (struct i2c_algo_pcf_data *adap)
return -ENXIO;
}
- /* S1=0xA0, next byte in S2 */
+ /* S1=0xA0, next byte in S2 */
set_pcf(adap, 1, I2C_PCF_PIN | I2C_PCF_ES1);
/* check to see S2 now selected */
if (((temp = get_pcf(adap, 1)) & 0x7f) != I2C_PCF_ES1) {
@@ -177,7 +194,7 @@ static int pcf_init_8584 (struct i2c_algo_pcf_data *adap)
return -ENXIO;
}
- /* load clock register S2 */
+ /* load clock register S2 */
i2c_outb(adap, get_clock(adap));
/* check it's really written, the only 5 lowest bits does matter */
if (((temp = i2c_inb(adap)) & 0x1f) != get_clock(adap)) {
@@ -185,7 +202,7 @@ static int pcf_init_8584 (struct i2c_algo_pcf_data *adap)
return -ENXIO;
}
- /* Enable serial interface, idle, S0 selected */
+ /* Enable serial interface, idle, S0 selected */
set_pcf(adap, 1, I2C_PCF_IDLE);
/* check to see PCF is really idled and we can access status register */
@@ -193,57 +210,47 @@ static int pcf_init_8584 (struct i2c_algo_pcf_data *adap)
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: PCF detection failed -- can't select S1` (0x%02x).\n", temp));
return -ENXIO;
}
-
- printk(KERN_DEBUG "i2c-algo-pcf.o: deteted and initialized PCF8584.\n");
+
+ printk(KERN_DEBUG "i2c-algo-pcf.o: detected and initialized PCF8584.\n");
return 0;
}
-
-/* ----- Utility functions
- */
-
static int pcf_sendbytes(struct i2c_adapter *i2c_adap, const char *buf,
- int count, int last)
+ int count, int last)
{
struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
int wrcount, status, timeout;
-
+
for (wrcount=0; wrcount<count; ++wrcount) {
DEB2(dev_dbg(&i2c_adap->dev, "i2c_write: writing %2.2X\n",
- buf[wrcount]&0xff));
+ buf[wrcount] & 0xff));
i2c_outb(adap, buf[wrcount]);
timeout = wait_for_pin(adap, &status);
if (timeout) {
- if (timeout == -EINTR) {
- /* arbitration lost */
- return -EINTR;
- }
+ if (timeout == -EINTR)
+ return -EINTR; /* arbitration lost */
+
i2c_stop(adap);
dev_err(&i2c_adap->dev, "i2c_write: error - timeout.\n");
return -EREMOTEIO; /* got a better one ?? */
}
-#ifndef STUB_I2C
if (status & I2C_PCF_LRB) {
i2c_stop(adap);
dev_err(&i2c_adap->dev, "i2c_write: error - no ack.\n");
return -EREMOTEIO; /* got a better one ?? */
}
-#endif
}
- if (last) {
+ if (last)
i2c_stop(adap);
- }
- else {
+ else
i2c_repstart(adap);
- }
- return (wrcount);
+ return wrcount;
}
-
static int pcf_readbytes(struct i2c_adapter *i2c_adap, char *buf,
- int count, int last)
+ int count, int last)
{
int i, status;
struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
@@ -253,42 +260,36 @@ static int pcf_readbytes(struct i2c_adapter *i2c_adap, char *buf,
for (i = 0; i <= count; i++) {
if ((wfp = wait_for_pin(adap, &status))) {
- if (wfp == -EINTR) {
- /* arbitration lost */
- return -EINTR;
- }
+ if (wfp == -EINTR)
+ return -EINTR; /* arbitration lost */
+
i2c_stop(adap);
dev_err(&i2c_adap->dev, "pcf_readbytes timed out.\n");
- return (-1);
+ return -1;
}
-#ifndef STUB_I2C
if ((status & I2C_PCF_LRB) && (i != count)) {
i2c_stop(adap);
dev_err(&i2c_adap->dev, "i2c_read: i2c_inb, No ack.\n");
- return (-1);
+ return -1;
}
-#endif
-
+
if (i == count - 1) {
set_pcf(adap, 1, I2C_PCF_ESO);
- } else
- if (i == count) {
- if (last) {
+ } else if (i == count) {
+ if (last)
i2c_stop(adap);
- } else {
+ else
i2c_repstart(adap);
- }
- };
+ }
- if (i) {
+ if (i)
buf[i - 1] = i2c_inb(adap);
- } else {
+ else
i2c_inb(adap); /* dummy read */
- }
}
- return (i - 1);
+ return i - 1;
}
@@ -309,78 +310,79 @@ static int pcf_doAddress(struct i2c_algo_pcf_data *adap,
}
static int pcf_xfer(struct i2c_adapter *i2c_adap,
- struct i2c_msg *msgs,
+ struct i2c_msg *msgs,
int num)
{
struct i2c_algo_pcf_data *adap = i2c_adap->algo_data;
struct i2c_msg *pmsg;
int i;
int ret=0, timeout, status;
-
+
+ if (adap->xfer_begin)
+ adap->xfer_begin(adap->data);
/* Check for bus busy */
timeout = wait_for_bb(adap);
if (timeout) {
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: "
- "Timeout waiting for BB in pcf_xfer\n");)
- return -EIO;
+ "Timeout waiting for BB in pcf_xfer\n");)
+ i = -EIO;
+ goto out;
}
-
+
for (i = 0;ret >= 0 && i < num; i++) {
pmsg = &msgs[i];
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: Doing %s %d bytes to 0x%02x - %d of %d messages\n",
pmsg->flags & I2C_M_RD ? "read" : "write",
- pmsg->len, pmsg->addr, i + 1, num);)
-
+ pmsg->len, pmsg->addr, i + 1, num);)
+
ret = pcf_doAddress(adap, pmsg);
/* Send START */
- if (i == 0) {
- i2c_start(adap);
- }
-
+ if (i == 0)
+ i2c_start(adap);
+
/* Wait for PIN (pending interrupt NOT) */
timeout = wait_for_pin(adap, &status);
if (timeout) {
if (timeout == -EINTR) {
/* arbitration lost */
- return (-EINTR);
+ i = -EINTR;
+ goto out;
}
i2c_stop(adap);
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: Timeout waiting "
"for PIN(1) in pcf_xfer\n");)
- return (-EREMOTEIO);
+ i = -EREMOTEIO;
+ goto out;
}
-
-#ifndef STUB_I2C
+
/* Check LRB (last rcvd bit - slave ack) */
if (status & I2C_PCF_LRB) {
i2c_stop(adap);
DEB2(printk(KERN_ERR "i2c-algo-pcf.o: No LRB(1) in pcf_xfer\n");)
- return (-EREMOTEIO);
+ i = -EREMOTEIO;
+ goto out;
}
-#endif
-
+
DEB3(printk(KERN_DEBUG "i2c-algo-pcf.o: Msg %d, addr=0x%x, flags=0x%x, len=%d\n",
i, msgs[i].addr, msgs[i].flags, msgs[i].len);)
-
- /* Read */
+
if (pmsg->flags & I2C_M_RD) {
- /* read bytes into buffer*/
ret = pcf_readbytes(i2c_adap, pmsg->buf, pmsg->len,
- (i + 1 == num));
-
+ (i + 1 == num));
+
if (ret != pmsg->len) {
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: fail: "
"only read %d bytes.\n",ret));
} else {
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: read %d bytes.\n",ret));
}
- } else { /* Write */
+ } else {
ret = pcf_sendbytes(i2c_adap, pmsg->buf, pmsg->len,
- (i + 1 == num));
-
+ (i + 1 == num));
+
if (ret != pmsg->len) {
DEB2(printk(KERN_DEBUG "i2c-algo-pcf.o: fail: "
"only wrote %d bytes.\n",ret));
@@ -390,24 +392,26 @@ static int pcf_xfer(struct i2c_adapter *i2c_adap,
}
}
- return (i);
+out:
+ if (adap->xfer_end)
+ adap->xfer_end(adap->data);
+ return i;
}
static u32 pcf_func(struct i2c_adapter *adap)
{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
I2C_FUNC_PROTOCOL_MANGLING;
}
-/* -----exported algorithm data: ------------------------------------- */
-
+/* exported algorithm data: */
static const struct i2c_algorithm pcf_algo = {
.master_xfer = pcf_xfer,
.functionality = pcf_func,
};
-/*
- * registering functions to load algorithms at runtime
+/*
+ * registering functions to load algorithms at runtime
*/
int i2c_pcf_add_bus(struct i2c_adapter *adap)
{
@@ -418,7 +422,6 @@ int i2c_pcf_add_bus(struct i2c_adapter *adap)
/* register new adapter to i2c module... */
adap->algo = &pcf_algo;
- adap->timeout = 100;
if ((rval = pcf_init_8584(pcf_adap)))
return rval;
@@ -435,4 +438,4 @@ MODULE_LICENSE("GPL");
module_param(i2c_debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(i2c_debug,
- "debug level - 0 off; 1 normal; 2,3 more verbose; 9 pcf-protocol");
+ "debug level - 0 off; 1 normal; 2,3 more verbose; 9 pcf-protocol");
diff --git a/drivers/i2c/algos/i2c-algo-pcf.h b/drivers/i2c/algos/i2c-algo-pcf.h
index 5263a9eeb8d..1ec703ee788 100644
--- a/drivers/i2c/algos/i2c-algo-pcf.h
+++ b/drivers/i2c/algos/i2c-algo-pcf.h
@@ -16,7 +16,8 @@
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301 USA. */
/* -------------------------------------------------------------------- */
/* With some changes from Frodo Looijaard <frodol@dds.nl> */
diff --git a/drivers/i2c/algos/i2c-algo-sgi.c b/drivers/i2c/algos/i2c-algo-sgi.c
deleted file mode 100644
index 6eaf145e1ad..00000000000
--- a/drivers/i2c/algos/i2c-algo-sgi.c
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
- * i2c-algo-sgi.c: i2c driver algorithm used by the VINO (SGI Indy) and
- * MACE (SGI O2) chips.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License version 2 as published by the Free Software Foundation.
- *
- * Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
-
-#include <linux/i2c.h>
-#include <linux/i2c-algo-sgi.h>
-
-
-#define SGI_I2C_FORCE_IDLE (0 << 0)
-#define SGI_I2C_NOT_IDLE (1 << 0)
-#define SGI_I2C_WRITE (0 << 1)
-#define SGI_I2C_READ (1 << 1)
-#define SGI_I2C_RELEASE_BUS (0 << 2)
-#define SGI_I2C_HOLD_BUS (1 << 2)
-#define SGI_I2C_XFER_DONE (0 << 4)
-#define SGI_I2C_XFER_BUSY (1 << 4)
-#define SGI_I2C_ACK (0 << 5)
-#define SGI_I2C_NACK (1 << 5)
-#define SGI_I2C_BUS_OK (0 << 7)
-#define SGI_I2C_BUS_ERR (1 << 7)
-
-#define get_control() adap->getctrl(adap->data)
-#define set_control(val) adap->setctrl(adap->data, val)
-#define read_data() adap->rdata(adap->data)
-#define write_data(val) adap->wdata(adap->data, val)
-
-
-static int wait_xfer_done(struct i2c_algo_sgi_data *adap)
-{
- int i;
-
- for (i = 0; i < adap->xfer_timeout; i++) {
- if ((get_control() & SGI_I2C_XFER_BUSY) == 0)
- return 0;
- udelay(1);
- }
-
- return -ETIMEDOUT;
-}
-
-static int wait_ack(struct i2c_algo_sgi_data *adap)
-{
- int i;
-
- if (wait_xfer_done(adap))
- return -ETIMEDOUT;
- for (i = 0; i < adap->ack_timeout; i++) {
- if ((get_control() & SGI_I2C_NACK) == 0)
- return 0;
- udelay(1);
- }
-
- return -ETIMEDOUT;
-}
-
-static int force_idle(struct i2c_algo_sgi_data *adap)
-{
- int i;
-
- set_control(SGI_I2C_FORCE_IDLE);
- for (i = 0; i < adap->xfer_timeout; i++) {
- if ((get_control() & SGI_I2C_NOT_IDLE) == 0)
- goto out;
- udelay(1);
- }
- return -ETIMEDOUT;
-out:
- if (get_control() & SGI_I2C_BUS_ERR)
- return -EIO;
- return 0;
-}
-
-static int do_address(struct i2c_algo_sgi_data *adap, unsigned int addr,
- int rd)
-{
- if (rd)
- set_control(SGI_I2C_NOT_IDLE);
- /* Check if bus is idle, eventually force it to do so */
- if (get_control() & SGI_I2C_NOT_IDLE)
- if (force_idle(adap))
- return -EIO;
- /* Write out the i2c chip address and specify operation */
- set_control(SGI_I2C_HOLD_BUS | SGI_I2C_WRITE | SGI_I2C_NOT_IDLE);
- if (rd)
- addr |= 1;
- write_data(addr);
- if (wait_ack(adap))
- return -EIO;
- return 0;
-}
-
-static int i2c_read(struct i2c_algo_sgi_data *adap, unsigned char *buf,
- unsigned int len)
-{
- int i;
-
- set_control(SGI_I2C_HOLD_BUS | SGI_I2C_READ | SGI_I2C_NOT_IDLE);
- for (i = 0; i < len; i++) {
- if (wait_xfer_done(adap))
- return -EIO;
- buf[i] = read_data();
- }
- set_control(SGI_I2C_RELEASE_BUS | SGI_I2C_FORCE_IDLE);
-
- return 0;
-
-}
-
-static int i2c_write(struct i2c_algo_sgi_data *adap, unsigned char *buf,
- unsigned int len)
-{
- int i;
-
- /* We are already in write state */
- for (i = 0; i < len; i++) {
- write_data(buf[i]);
- if (wait_ack(adap))
- return -EIO;
- }
- return 0;
-}
-
-static int sgi_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
- int num)
-{
- struct i2c_algo_sgi_data *adap = i2c_adap->algo_data;
- struct i2c_msg *p;
- int i, err = 0;
-
- for (i = 0; !err && i < num; i++) {
- p = &msgs[i];
- err = do_address(adap, p->addr, p->flags & I2C_M_RD);
- if (err || !p->len)
- continue;
- if (p->flags & I2C_M_RD)
- err = i2c_read(adap, p->buf, p->len);
- else
- err = i2c_write(adap, p->buf, p->len);
- }
-
- return (err < 0) ? err : i;
-}
-
-static u32 sgi_func(struct i2c_adapter *adap)
-{
- return I2C_FUNC_SMBUS_EMUL;
-}
-
-static const struct i2c_algorithm sgi_algo = {
- .master_xfer = sgi_xfer,
- .functionality = sgi_func,
-};
-
-/*
- * registering functions to load algorithms at runtime
- */
-int i2c_sgi_add_bus(struct i2c_adapter *adap)
-{
- adap->algo = &sgi_algo;
-
- return i2c_add_adapter(adap);
-}
-EXPORT_SYMBOL(i2c_sgi_add_bus);
-
-MODULE_AUTHOR("Ladislav Michl <ladis@linux-mips.org>");
-MODULE_DESCRIPTION("I2C-Bus SGI algorithm");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 03:42:21 +0000