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hwmon: (spd5118) Add suspend/resume support

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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>
This commit is contained in:
Guenter Roeck 2024-05-30 11:44:11 -07:00
parent 09262e9814
commit d1b4c75508
1 changed files with 39 additions and 0 deletions
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39
drivers/hwmon/spd5118.c
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@ -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,