def smbus_init():
# Accessing ports < 0x400 needs special privileges
ioport.iopl(3)
# Try to identify whether there's "something" at 0x400 with the status register
ioport.outb(0xff, SMBHSTSTS)
if ioport.inb(SMBHSTSTS) & 0x01:
return False
return True
def smbus_write_block(addr, command, data):
if addr_validate(addr) == False:
return False
if cmd_validate(command) == False:
return False
if len(data) > 32:
return False
# Clear status register
ioport.outb(0xff, SMBHSTSTS)
# Set up command register, slave address register
addr = (addr << 1) | 0x00 # We're writing data
ioport.outb(addr, SMBHSTADD)
ioport.outb(command, SMBHSTCMD)
# Use block buffer
ioport.outb(0x02, SMBAUXCTL)
# Set Data0 to length and Data1 to sane value
ioport.outb(len(data), SMBHSTDAT0)
ioport.outb(0, SMBHSTDAT1)
# Fill block buffer with data
ioport.inb(SMBHSTCNT)
for b in data:
ioport.outb(b, SMBBLKDAT)
# Send block read command and start reading immediately
cmd = I801_BLOCK_DATA | I801_START
ioport.outb(cmd, SMBHSTCNT)
# Wait for the write to finish
while (not (ioport.inb(SMBHSTSTS) & 0x02) and not (ioport.inb(SMBHSTSTS) & 0x1c)): pass
# Check whether the operation was successful
status = ioport.inb(SMBHSTSTS)
if (status & SMBHSTERRMASK):
return False
return True
def smbus_read_block(addr, command):
if addr_validate(addr) == False:
return False
if cmd_validate(command) == False:
return False
# Clear status register
ioport.outb(0xff, SMBHSTSTS)
# Set up command register, slave address register
addr = (addr << 1) | 0x01 # We're reading data
ioport.outb(addr, SMBHSTADD)
ioport.outb(command, SMBHSTCMD)
# Use block buffer
ioport.outb(0x02, SMBAUXCTL)
# Set Data0 and Data1 to sane values
ioport.outb(32, SMBHSTDAT0) # Read 32 bytes maximum
ioport.outb(0, SMBHSTDAT1)
# Send block read command and start reading immediately
cmd = I801_BLOCK_DATA | I801_START
ioport.outb(cmd, SMBHSTCNT)
# Wait for the read to finish
while (not (ioport.inb(SMBHSTSTS) & 0x02) and not (ioport.inb(SMBHSTSTS) & 0x1c)): pass
# Check whether the operation was successful
status = ioport.inb(SMBHSTSTS)
if (status & SMBHSTERRMASK):
return False
# Retrieve the data
len = ioport.inb(SMBHSTDAT0)
ioport.inb(SMBHSTCNT)
data = []
for i in xrange(len):
data.append(ioport.inb(SMBBLKDAT))
return data
def ec_write(adr, data):
ioport.outb(adr >> 8, EC_BASE+1)
ioport.outb(adr & 0xff, EC_BASE+2)
ioport.outb(data, EC_BASE+3)
def ec_read(adr):
ioport.outb(adr >> 8, EC_BASE+1)
ioport.outb(adr & 0xff, EC_BASE+2)
return ioport.inb(EC_BASE+3)
