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@xxxxxxxxxxxx>
---
drivers/misc/eeprom/at24.c | 40 ++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 0681d5fdd538..06ae2cc32f79 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -22,6 +22,7 @@
#include <linux/nvmem-provider.h>
#include <linux/regmap.h>
#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
#include <linux/gpio/consumer.h>
/* Address pointer is 16 bit. */
@@ -91,6 +92,7 @@ struct at24_data {
struct gpio_desc *wp_gpio;
+ struct regulator *vcc_reg;
/*
* Some chips tie up multiple I2C addresses; dummy devices reserve
* them for us, and we'll use them with SMBus calls.
@@ -662,6 +664,12 @@ 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)) {
+ dev_err(dev, "failed to get at24 VCC regulator\n");
+ return PTR_ERR(at24->vcc_reg);
+ }
+
at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);
if (IS_ERR(at24->wp_gpio))
return PTR_ERR(at24->wp_gpio);
@@ -701,6 +709,12 @@ 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 at24 vcc regulator\n");
+ return err;
+ }
+
/* enable runtime pm */
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
@@ -713,6 +727,7 @@ 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;
}
@@ -729,14 +744,39 @@ static int at24_probe(struct i2c_client *client)
static int at24_remove(struct i2c_client *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),
},
--
2.18.0
