s390: fix handling of -1 in set{,fs}[gu]id16 syscalls

[pandora-kernel.git] / drivers / hwmon / adm1021.c

diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c
index 1ad0a88..8178927 100644 (file)
--- a/drivers/hwmon/adm1021.c
+++ b/drivers/hwmon/adm1021.c
@@ -311,26 +311,68 @@ static int adm1021_detect(struct i2c_client *client,
        man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);
        dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);
 
+       if (man_id < 0 || dev_id < 0)
+               return -ENODEV;
+
        if (man_id == 0x4d && dev_id == 0x01)
                type_name = "max1617a";
        else if (man_id == 0x41) {
                if ((dev_id & 0xF0) == 0x30)
                        type_name = "adm1023";
-               else
+               else if ((dev_id & 0xF0) == 0x00)
                        type_name = "adm1021";
+               else
+                       return -ENODEV;
        } else if (man_id == 0x49)
                type_name = "thmc10";
        else if (man_id == 0x23)
                type_name = "gl523sm";
        else if (man_id == 0x54)
                type_name = "mc1066";
-       /* LM84 Mfr ID in a different place, and it has more unused bits */
-       else if (conv_rate == 0x00
-                && (config & 0x7F) == 0x00
-                && (status & 0xAB) == 0x00)
-               type_name = "lm84";
-       else
-               type_name = "max1617";
+       else {
+               int lte, rte, lhi, rhi, llo, rlo;
+
+               /* extra checks for LM84 and MAX1617 to avoid misdetections */
+
+               llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));
+               rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));
+
+               /* fail if any of the additional register reads failed */
+               if (llo < 0 || rlo < 0)
+                       return -ENODEV;
+
+               lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));
+               rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));
+               lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));
+               rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));
+
+               /*
+                * Fail for negative temperatures and negative high limits.
+                * This check also catches read errors on the tested registers.
+                */
+               if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)
+                       return -ENODEV;
+
+               /* fail if all registers hold the same value */
+               if (lte == rte && lte == lhi && lte == rhi && lte == llo
+                   && lte == rlo)
+                       return -ENODEV;
+
+               /*
+                * LM84 Mfr ID is in a different place,
+                * and it has more unused bits.
+                */
+               if (conv_rate == 0x00
+                   && (config & 0x7F) == 0x00
+                   && (status & 0xAB) == 0x00) {
+                       type_name = "lm84";
+               } else {
+                       /* fail if low limits are larger than high limits */
+                       if ((s8)llo > lhi || (s8)rlo > rhi)
+                               return -ENODEV;
+                       type_name = "max1617";
+               }
+       }
 
        pr_debug("adm1021: Detected chip %s at adapter %d, address 0x%02x.\n",
                 type_name, i2c_adapter_id(adapter), client->addr);