Commit d1b4c755 authored by Guenter Roeck's avatar Guenter Roeck
Browse files

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: default avatarThomas Weißschuh <linux@weissschuh.net>
Tested-by: default avatarStephen Horvath <s.horvath@outlook.com.au>
Tested-by: default avatarArmin Wolf <W_Armin@gmx.de>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 09262e98

drivers/hwmon/spd5118.c

+39 −0
Original line number Diff line number Diff line
@@ -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,