aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--Documentation/i2c/smbus-protocol40
-rw-r--r--MAINTAINERS2
-rw-r--r--drivers/i2c/busses/i2c-i801.c13
-rw-r--r--drivers/i2c/busses/i2c-piix4.c5
4 files changed, 37 insertions, 23 deletions
diff --git a/Documentation/i2c/smbus-protocol b/Documentation/i2c/smbus-protocol
index 49f5b680809..d1f22618e14 100644
--- a/Documentation/i2c/smbus-protocol
+++ b/Documentation/i2c/smbus-protocol
@@ -23,6 +23,12 @@ don't match these function names. For some of the operations which pass a
single data byte, the functions using SMBus protocol operation names execute
a different protocol operation entirely.
+Each transaction type corresponds to a functionality flag. Before calling a
+transaction function, a device driver should always check (just once) for
+the corresponding functionality flag to ensure that the underlying I2C
+adapter supports the transaction in question. See
+<file:Documentation/i2c/functionality> for the details.
+
Key to symbols
==============
@@ -49,6 +55,8 @@ This sends a single bit to the device, at the place of the Rd/Wr bit.
A Addr Rd/Wr [A] P
+Functionality flag: I2C_FUNC_SMBUS_QUICK
+
SMBus Receive Byte: i2c_smbus_read_byte()
==========================================
@@ -60,6 +68,8 @@ the previous SMBus command.
S Addr Rd [A] [Data] NA P
+Functionality flag: I2C_FUNC_SMBUS_READ_BYTE
+
SMBus Send Byte: i2c_smbus_write_byte()
========================================
@@ -69,6 +79,8 @@ to a device. See Receive Byte for more information.
S Addr Wr [A] Data [A] P
+Functionality flag: I2C_FUNC_SMBUS_WRITE_BYTE
+
SMBus Read Byte: i2c_smbus_read_byte_data()
============================================
@@ -78,6 +90,8 @@ The register is specified through the Comm byte.
S Addr Wr [A] Comm [A] S Addr Rd [A] [Data] NA P
+Functionality flag: I2C_FUNC_SMBUS_READ_BYTE_DATA
+
SMBus Read Word: i2c_smbus_read_word_data()
============================================
@@ -88,6 +102,8 @@ byte. But this time, the data is a complete word (16 bits).
S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
+Functionality flag: I2C_FUNC_SMBUS_READ_WORD_DATA
+
Note the convenience function i2c_smbus_read_word_swapped is
available for reads where the two data bytes are the other way
around (not SMBus compliant, but very popular.)
@@ -102,6 +118,8 @@ the Read Byte operation.
S Addr Wr [A] Comm [A] Data [A] P
+Functionality flag: I2C_FUNC_SMBUS_WRITE_BYTE_DATA
+
SMBus Write Word: i2c_smbus_write_word_data()
==============================================
@@ -112,6 +130,8 @@ specified through the Comm byte.
S Addr Wr [A] Comm [A] DataLow [A] DataHigh [A] P
+Functionality flag: I2C_FUNC_SMBUS_WRITE_WORD_DATA
+
Note the convenience function i2c_smbus_write_word_swapped is
available for writes where the two data bytes are the other way
around (not SMBus compliant, but very popular.)
@@ -126,6 +146,8 @@ This command selects a device register (through the Comm byte), sends
S Addr Wr [A] Comm [A] DataLow [A] DataHigh [A]
S Addr Rd [A] [DataLow] A [DataHigh] NA P
+Functionality flag: I2C_FUNC_SMBUS_PROC_CALL
+
SMBus Block Read: i2c_smbus_read_block_data()
==============================================
@@ -137,6 +159,8 @@ of data is specified by the device in the Count byte.
S Addr Wr [A] Comm [A]
S Addr Rd [A] [Count] A [Data] A [Data] A ... A [Data] NA P
+Functionality flag: I2C_FUNC_SMBUS_READ_BLOCK_DATA
+
SMBus Block Write: i2c_smbus_write_block_data()
================================================
@@ -147,6 +171,8 @@ Comm byte. The amount of data is specified in the Count byte.
S Addr Wr [A] Comm [A] Count [A] Data [A] Data [A] ... [A] Data [A] P
+Functionality flag: I2C_FUNC_SMBUS_WRITE_BLOCK_DATA
+
SMBus Block Write - Block Read Process Call
===========================================
@@ -160,6 +186,8 @@ This command selects a device register (through the Comm byte), sends
S Addr Wr [A] Comm [A] Count [A] Data [A] ...
S Addr Rd [A] [Count] A [Data] ... A P
+Functionality flag: I2C_FUNC_SMBUS_BLOCK_PROC_CALL
+
SMBus Host Notify
=================
@@ -229,15 +257,7 @@ designated register that is specified through the Comm byte.
S Addr Wr [A] Comm [A]
S Addr Rd [A] [Data] A [Data] A ... A [Data] NA P
-
-I2C Block Read (2 Comm bytes)
-=============================
-
-This command reads a block of bytes from a device, from a
-designated register that is specified through the two Comm bytes.
-
-S Addr Wr [A] Comm1 [A] Comm2 [A]
- S Addr Rd [A] [Data] A [Data] A ... A [Data] NA P
+Functionality flag: I2C_FUNC_SMBUS_READ_I2C_BLOCK
I2C Block Write: i2c_smbus_write_i2c_block_data()
@@ -249,3 +269,5 @@ Comm byte. Note that command lengths of 0, 2, or more bytes are
supported as they are indistinguishable from data.
S Addr Wr [A] Comm [A] Data [A] Data [A] ... [A] Data [A] P
+
+Functionality flag: I2C_FUNC_SMBUS_WRITE_I2C_BLOCK
diff --git a/MAINTAINERS b/MAINTAINERS
index f71d2f901a6..d9c31b906ac 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3712,7 +3712,7 @@ I2C/SMBUS STUB DRIVER
M: "Mark M. Hoffman" <mhoffman@lightlink.com>
L: linux-i2c@vger.kernel.org
S: Maintained
-F: drivers/i2c/busses/i2c-stub.c
+F: drivers/i2c/i2c-stub.c
I2C SUBSYSTEM
M: Wolfram Sang <w.sang@pengutronix.de>
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 6abc00d5988..1e73638225e 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -81,6 +81,7 @@
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/err.h>
+#include <linux/of_i2c.h>
#if (defined CONFIG_I2C_MUX_GPIO || defined CONFIG_I2C_MUX_GPIO_MODULE) && \
defined CONFIG_DMI
@@ -1108,6 +1109,7 @@ static int __devinit i801_probe(struct pci_dev *dev,
/* fall through */
default:
priv->features |= FEATURE_I2C_BLOCK_READ;
+ priv->features |= FEATURE_IRQ;
/* fall through */
case PCI_DEVICE_ID_INTEL_82801DB_3:
priv->features |= FEATURE_SMBUS_PEC;
@@ -1120,16 +1122,6 @@ static int __devinit i801_probe(struct pci_dev *dev,
break;
}
- /* IRQ processing tested on CougarPoint PCH, ICH5, ICH7-M and ICH10 */
- if (dev->device == PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS ||
- dev->device == PCI_DEVICE_ID_INTEL_82801EB_3 ||
- dev->device == PCI_DEVICE_ID_INTEL_ICH7_17 ||
- dev->device == PCI_DEVICE_ID_INTEL_ICH8_5 ||
- dev->device == PCI_DEVICE_ID_INTEL_ICH9_6 ||
- dev->device == PCI_DEVICE_ID_INTEL_ICH10_4 ||
- dev->device == PCI_DEVICE_ID_INTEL_ICH10_5)
- priv->features |= FEATURE_IRQ;
-
/* Disable features on user request */
for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
if (priv->features & disable_features & (1 << i))
@@ -1215,6 +1207,7 @@ static int __devinit i801_probe(struct pci_dev *dev,
goto exit_free_irq;
}
+ of_i2c_register_devices(&priv->adapter);
i801_probe_optional_slaves(priv);
/* We ignore errors - multiplexing is optional */
i801_add_mux(priv);
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 8bbd6ece7c4..f7216ed2f3a 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -204,9 +204,8 @@ static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
*/
pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
temp | 1);
- dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
- "WARNING: SMBus interface has been "
- "FORCEFULLY ENABLED!\n");
+ dev_notice(&PIIX4_dev->dev,
+ "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
} else {
dev_err(&PIIX4_dev->dev,
"Host SMBus controller not enabled!\n");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-23 12:08:19 +0000