The functionality bit vector is always returned as a little-endian 32-bit number by the device, so it must be byte-swapped to the host endianness.
On the other hand, the delay value is handled by the USB stack, so no byte swapping is needed on our side. This fixes bug #15105: http://bugzilla.kernel.org/show_bug.cgi?id=15105 Reported-by: Jens Richter <[email protected]> Signed-off-by: Jean Delvare <[email protected]> Tested-by: Jens Richter <[email protected]> Cc: Till Harbaum <[email protected]> Cc: [email protected] --- drivers/i2c/busses/i2c-tiny-usb.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- linux-2.6.33-rc5.orig/drivers/i2c/busses/i2c-tiny-usb.c 2010-01-28 08:08:54.000000000 +0100 +++ linux-2.6.33-rc5/drivers/i2c/busses/i2c-tiny-usb.c 2010-01-28 09:13:30.000000000 +0100 @@ -13,6 +13,7 @@ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/module.h> +#include <linux/types.h> /* include interfaces to usb layer */ #include <linux/usb.h> @@ -31,8 +32,8 @@ #define CMD_I2C_IO_END (1<<1) /* i2c bit delay, default is 10us -> 100kHz */ -static int delay = 10; -module_param(delay, int, 0); +static unsigned short delay = 10; +module_param(delay, ushort, 0); MODULE_PARM_DESC(delay, "bit delay in microseconds, " "e.g. 10 for 100kHz (default is 100kHz)"); @@ -109,7 +110,7 @@ static int usb_xfer(struct i2c_adapter * static u32 usb_func(struct i2c_adapter *adapter) { - u32 func; + __le32 func; /* get functionality from adapter */ if (usb_read(adapter, CMD_GET_FUNC, 0, 0, &func, sizeof(func)) != @@ -118,7 +119,7 @@ static u32 usb_func(struct i2c_adapter * return 0; } - return func; + return le32_to_cpu(func); } /* This is the actual algorithm we define */ @@ -216,8 +217,7 @@ static int i2c_tiny_usb_probe(struct usb "i2c-tiny-usb at bus %03d device %03d", dev->usb_dev->bus->busnum, dev->usb_dev->devnum); - if (usb_write(&dev->adapter, CMD_SET_DELAY, - cpu_to_le16(delay), 0, NULL, 0) != 0) { + if (usb_write(&dev->adapter, CMD_SET_DELAY, delay, 0, NULL, 0) != 0) { dev_err(&dev->adapter.dev, "failure setting delay to %dus\n", delay); retval = -EIO; -- Jean Delvare -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
