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Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging

Browse source 
Pull i2c update from Jean Delvare:
 "This is my last pull request for the i2c subsystem.  It includes all
  the patches I collected between kernel v3.7-rc1 and me passing i2c
  maintenance duties over to Wolfram.

  Future patches to the many i2c bus drivers I still maintain will go
  through Wolfram's tree."

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  i2c: Mention functionality flags in SMBus protocol documentation
  i2c-piix4: Convert dev_printk(KERN_<LEVEL> to dev_<level>(
  i2c-i801: Enable interrupts for all post-ICH5 chips
  i2c-i801: Add device tree support
  MAINTAINERS: Fix drivers/i2c/busses/i2c-stub.c
This commit is contained in:
Linus Torvalds 2012-12-16 17:41:26 -08:00
commit 123df7ae0d
4 changed files with 37 additions and 23 deletions
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40
Documentation/i2c/smbus-protocol
View file

@ -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

2
MAINTAINERS
View file

@ -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>

13
drivers/i2c/busses/i2c-i801.c
View file

@ -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);

5
drivers/i2c/busses/i2c-piix4.c
View file

@ -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");