hwmon: (spd5118) Add suspend/resume support

Add suspend/resume support to ensure that limit and configuration
registers are updated and synchronized after a suspend/resume cycle.

Cc: Armin Wolf <W_Armin@gmx.de>
Cc: Stephen Horvath <s.horvath@outlook.com.au>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: Stephen Horvath <s.horvath@outlook.com.au>
Tested-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/spd5118.c b/drivers/hwmon/spd5118.c
index d3fc0ae17743218920441c0057bfac32cc8fab56..d55c073ff5fd2af014050f015fcf507f9069ae5d 100644 (file)
--- a/drivers/hwmon/spd5118.c
+++ b/drivers/hwmon/spd5118.c
@@ -20,6 +20,7 @@
 #include <linux/i2c.h>
 #include <linux/hwmon.h>
 #include <linux/module.h>
+#include <linux/pm.h>
 #include <linux/regmap.h>
 #include <linux/units.h>
 
@@ -432,6 +433,8 @@ static int spd5118_probe(struct i2c_client *client)
        if (!spd5118_vendor_valid(bank, vendor))
                return -ENODEV;
 
+       dev_set_drvdata(dev, regmap);
+
        hwmon_dev = devm_hwmon_device_register_with_info(dev, "spd5118",
                                                         regmap, &spd5118_chip_info,
                                                         NULL);
@@ -449,6 +452,41 @@ static int spd5118_probe(struct i2c_client *client)
        return 0;
 }
 
+static int spd5118_suspend(struct device *dev)
+{
+       struct regmap *regmap = dev_get_drvdata(dev);
+       u32 regval;
+       int err;
+
+       /*
+        * Make sure the configuration register in the regmap cache is current
+        * before bypassing it.
+        */
+       err = regmap_read(regmap, SPD5118_REG_TEMP_CONFIG, &regval);
+       if (err < 0)
+               return err;
+
+       regcache_cache_bypass(regmap, true);
+       regmap_update_bits(regmap, SPD5118_REG_TEMP_CONFIG, SPD5118_TS_DISABLE,
+                          SPD5118_TS_DISABLE);
+       regcache_cache_bypass(regmap, false);
+
+       regcache_cache_only(regmap, true);
+       regcache_mark_dirty(regmap);
+
+       return 0;
+}
+
+static int spd5118_resume(struct device *dev)
+{
+       struct regmap *regmap = dev_get_drvdata(dev);
+
+       regcache_cache_only(regmap, false);
+       return regcache_sync(regmap);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(spd5118_pm_ops, spd5118_suspend, spd5118_resume);
+
 static const struct i2c_device_id spd5118_id[] = {
        { "spd5118", 0 },
        { }
@@ -466,6 +504,7 @@ static struct i2c_driver spd5118_driver = {
        .driver = {
                .name   = "spd5118",
                .of_match_table = spd5118_of_ids,
+               .pm = pm_sleep_ptr(&spd5118_pm_ops),
        },
        .probe          = spd5118_probe,
        .id_table       = spd5118_id,