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authorBibby Hsieh <bibby.hsieh@mediatek.com>2020-01-23 12:52:57 +0100
committerBartosz Golaszewski <bgolaszewski@baylibre.com>2020-01-23 12:52:57 +0100
commitcd5676db0574cc1c0b234bc3b17565b07290aa72 (patch)
tree33206e3fd7f9767618923154b5fd638cc835a9f0 /drivers/misc
parentc6cadc7538bb6df746f1613ee317b646230b2f5e (diff)
misc: eeprom: at24: support pm_runtime control
Although in the most platforms, the power of eeprom are alway on, some platforms disable the eeprom power in order to meet low power request. This patch add the pm_runtime ops to control power to support all platforms. Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com> [Bartosz: rebased on top of current at24/for-next] Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/eeprom/at24.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 896c1fe3c44b..031eb64549af 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -21,6 +21,7 @@
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
#include <linux/slab.h>
/* Address pointer is 16 bit. */
@@ -87,6 +88,7 @@ struct at24_data {
u8 flags;
struct nvmem_device *nvmem;
+ struct regulator *vcc_reg;
/*
* Some chips tie up multiple I2C addresses; dummy devices reserve
@@ -656,6 +658,9 @@ static int at24_probe(struct i2c_client *client)
at24->client[0].client = client;
at24->client[0].regmap = regmap;
+ at24->vcc_reg = devm_regulator_get(dev, "vcc");
+ if (IS_ERR(at24->vcc_reg))
+ return PTR_ERR(at24->vcc_reg);
writable = !(flags & AT24_FLAG_READONLY);
if (writable) {
@@ -692,6 +697,12 @@ static int at24_probe(struct i2c_client *client)
i2c_set_clientdata(client, at24);
+ err = regulator_enable(at24->vcc_reg);
+ if (err) {
+ dev_err(dev, "Failed to enable vcc regulator\n");
+ return err;
+ }
+
/* enable runtime pm */
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
@@ -704,6 +715,7 @@ static int at24_probe(struct i2c_client *client)
pm_runtime_idle(dev);
if (err) {
pm_runtime_disable(dev);
+ regulator_disable(at24->vcc_reg);
return -ENODEV;
}
@@ -719,15 +731,42 @@ static int at24_probe(struct i2c_client *client)
static int at24_remove(struct i2c_client *client)
{
+ struct at24_data *at24 = i2c_get_clientdata(client);
+
pm_runtime_disable(&client->dev);
+ if (!pm_runtime_status_suspended(&client->dev))
+ regulator_disable(at24->vcc_reg);
pm_runtime_set_suspended(&client->dev);
return 0;
}
+static int __maybe_unused at24_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct at24_data *at24 = i2c_get_clientdata(client);
+
+ return regulator_disable(at24->vcc_reg);
+}
+
+static int __maybe_unused at24_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct at24_data *at24 = i2c_get_clientdata(client);
+
+ return regulator_enable(at24->vcc_reg);
+}
+
+static const struct dev_pm_ops at24_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(at24_suspend, at24_resume, NULL)
+};
+
static struct i2c_driver at24_driver = {
.driver = {
.name = "at24",
+ .pm = &at24_pm_ops,
.of_match_table = at24_of_match,
.acpi_match_table = ACPI_PTR(at24_acpi_ids),
},