hwmon/w83627ehf: Add error messages for two error cases

If the Super-I/O device is disabled, it is likely the BIOS has a good
reason for leaving it disabled, so give a warning when enabling it --
it's not likely to be wired correctly or be able to give good data.

Also, if the Super-I/O device is configured with an address of 0, the
driver refuses to initialize it.

Signed-off-by: David Hubbard <david.c.hubbard@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index 2157c3424de1..e615b8378fc3 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -1387,14 +1387,19 @@ static int __init w83627ehf_find(int sioaddr, unsigned short *addr,
             | superio_inb(sioaddr, SIO_REG_ADDR + 1);
         *addr = val & IOREGION_ALIGNMENT;
         if (*addr == 0) {
+                printk(KERN_ERR DRVNAME ": Refusing to enable a Super-I/O "
+                       "device with a base I/O port 0.\n");
                 superio_exit(sioaddr);
                 return -ENODEV;
         }
 
         /* Activate logical device if needed */
         val = superio_inb(sioaddr, SIO_REG_ENABLE);
-        if (!(val & 0x01))
+        if (!(val & 0x01)) {
+                printk(KERN_WARNING DRVNAME ": Forcibly enabling Super-I/O. "
+                       "Sensor is probably unusable.\n");
                 superio_outb(sioaddr, SIO_REG_ENABLE, val | 0x01);
+        }
 
         superio_exit(sioaddr);
         pr_info(DRVNAME ": Found %s chip at %#x\n", sio_name, *addr);