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misc: eeprom: at24: support pm_runtime control

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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>
This commit is contained in:
Bibby Hsieh 2020-01-23 12:52:57 +01:00 committed by Bartosz Golaszewski
parent c6cadc7538
commit cd5676db05
1 changed files with 39 additions and 0 deletions
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39
drivers/misc/eeprom/at24.c
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@ -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),
},