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authorJean Delvare <jdelvare@suse.de>2022-03-01 19:39:37 +0300
committerWolfram Sang <wsa@kernel.org>2022-03-03 00:12:01 +0300
commit55b6f82e9443aaf0c6c3a27c394481555ed0da50 (patch)
tree50b8a2deff934bbd06c8961a51248073cdcc6942 /drivers/i2c/busses/i2c-i801.c
parent9c02c6391c88a9d2669c2ff8da92cf6efd7f760b (diff)
downloadlinux-55b6f82e9443aaf0c6c3a27c394481555ed0da50.tar.xz
i2c: i801: Add support for the Process Call command
The Process Call command is implemented by the hardware since the very first Intel 82801 chipset, and trivial to support. Oscar Romero Matamala from the Georgia Institute of Technology told me it is needed for an experiment his team is working on at the moment, so let's just add support for it. Signed-off-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-i801.c')
-rw-r--r--drivers/i2c/busses/i2c-i801.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 715f6d51d09c..1fc006a1d532 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -166,7 +166,7 @@
#define I801_BYTE 0x04
#define I801_BYTE_DATA 0x08
#define I801_WORD_DATA 0x0C
-#define I801_PROC_CALL 0x10 /* unimplemented */
+#define I801_PROC_CALL 0x10
#define I801_BLOCK_DATA 0x14
#define I801_I2C_BLOCK_DATA 0x18 /* ICH5 and later */
#define I801_BLOCK_PROC_CALL 0x1C
@@ -838,6 +838,14 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
}
xact = I801_WORD_DATA;
break;
+ case I2C_SMBUS_PROC_CALL:
+ outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
+ outb_p(command, SMBHSTCMD(priv));
+ outb_p(data->word & 0xff, SMBHSTDAT0(priv));
+ outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
+ xact = I801_PROC_CALL;
+ read_write = I2C_SMBUS_READ;
+ break;
case I2C_SMBUS_BLOCK_DATA:
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
SMBHSTADD(priv));
@@ -910,6 +918,7 @@ static s32 i801_access(struct i2c_adapter *adap, u16 addr,
data->byte = inb_p(SMBHSTDAT0(priv));
break;
case I801_WORD_DATA:
+ case I801_PROC_CALL:
data->word = inb_p(SMBHSTDAT0(priv)) +
(inb_p(SMBHSTDAT1(priv)) << 8);
break;
@@ -935,6 +944,7 @@ static u32 i801_func(struct i2c_adapter *adapter)
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_PROC_CALL |
I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
((priv->features & FEATURE_BLOCK_PROC) ?