drivers: w1: add hwmon support structures

This patch has changes to w1.h/w1.c generic files to add (optional) hwmon
support structures.

Signed-off-by: Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 3c76e1ca4b83..0c2a5a8327bd 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -25,6 +25,7 @@
 #include <linux/sched.h>
 #include <linux/kthread.h>
 #include <linux/freezer.h>
+#include <linux/hwmon.h>
 
 #include <linux/atomic.h>
 
@@ -649,9 +650,24 @@ static int w1_family_notify(unsigned long action, struct w1_slave *sl)
                                 return err;
                         }
                 }
-
+                if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info) {
+                        struct device *hwmon
+                                = hwmon_device_register_with_info(&sl->dev,
+                                                "w1_slave_temp", sl,
+                                                fops->chip_info,
+                                                NULL);
+                        if (IS_ERR(hwmon)) {
+                                dev_warn(&sl->dev,
+                                         "could not create hwmon device\n");
+                        } else {
+                                sl->hwmon = hwmon;
+                        }
+                }
                 break;
         case BUS_NOTIFY_DEL_DEVICE:
+                if (IS_REACHABLE(CONFIG_HWMON) && fops->chip_info &&
+                            sl->hwmon)
+                        hwmon_device_unregister(sl->hwmon);
                 if (fops->remove_slave)
                         sl->family->fops->remove_slave(sl);
                 if (fops->groups)