+/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
+static int w83781d_alias_detect(struct i2c_client *client, u8 chipid)
+{
+ struct w83781d_data *i2c, *isa;
+ int i;
+
+ if (!pdev) /* No ISA chip */
+ return 0;
+
+ i2c = i2c_get_clientdata(client);
+ isa = platform_get_drvdata(pdev);
+
+ if (w83781d_read_value(isa, W83781D_REG_I2C_ADDR) != client->addr)
+ return 0; /* Address doesn't match */
+ if (w83781d_read_value(isa, W83781D_REG_WCHIPID) != chipid)
+ return 0; /* Chip type doesn't match */
+
+ /* We compare all the limit registers, the config register and the
+ * interrupt mask registers */
+ for (i = 0x2b; i <= 0x3d; i++) {
+ if (w83781d_read_value(isa, i) != w83781d_read_value(i2c, i))
+ return 0;
+ }
+ if (w83781d_read_value(isa, W83781D_REG_CONFIG) !=
+ w83781d_read_value(i2c, W83781D_REG_CONFIG))
+ return 0;
+ for (i = 0x43; i <= 0x46; i++) {
+ if (w83781d_read_value(isa, i) != w83781d_read_value(i2c, i))
+ return 0;
+ }
+
+ return 1;
+}
+