diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-tiny-usb.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-tiny-usb.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c index b1c050ff311d..b5b1bbf37d3c 100644 --- a/drivers/i2c/busses/i2c-tiny-usb.c +++ b/drivers/i2c/busses/i2c-tiny-usb.c @@ -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> @@ -30,11 +31,13 @@ #define CMD_I2C_IO_BEGIN (1<<0) #define CMD_I2C_IO_END (1<<1) -/* i2c bit delay, default is 10us -> 100kHz */ -static int delay = 10; -module_param(delay, int, 0); -MODULE_PARM_DESC(delay, "bit delay in microseconds, " - "e.g. 10 for 100kHz (default is 100kHz)"); +/* i2c bit delay, default is 10us -> 100kHz max + (in practice, due to additional delays in the i2c bitbanging + code this results in a i2c clock of about 50kHz) */ +static unsigned short delay = 10; +module_param(delay, ushort, 0); +MODULE_PARM_DESC(delay, "bit delay in microseconds " + "(default is 10us for 100kHz max)"); static int usb_read(struct i2c_adapter *adapter, int cmd, int value, int index, void *data, int len); @@ -109,7 +112,7 @@ static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) 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 +121,7 @@ static u32 usb_func(struct i2c_adapter *adapter) return 0; } - return func; + return le32_to_cpu(func); } /* This is the actual algorithm we define */ @@ -136,7 +139,7 @@ static const struct i2c_algorithm usb_algorithm = { * Future Technology Devices International Ltd., later a pair was * bought from EZPrototypes */ -static struct usb_device_id i2c_tiny_usb_table [] = { +static const struct usb_device_id i2c_tiny_usb_table[] = { { USB_DEVICE(0x0403, 0xc631) }, /* FTDI */ { USB_DEVICE(0x1c40, 0x0534) }, /* EZPrototypes */ { } /* Terminating entry */ @@ -216,8 +219,7 @@ static int i2c_tiny_usb_probe(struct usb_interface *interface, "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; |