Although in the most platforms, the power of eeprom and i2c
are alway on, some platforms disable the eeprom and i2c 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 | 61 +++++++++++++++++++++++++++++++++++++-
1 file changed, 60 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 35bf2477693d..2843e4b4aacd 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -23,6 +23,7 @@
#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. */
@@ -68,6 +69,12 @@
* which won't work on pure SMBus systems.
*/
+static const char * const at24_supply_names[] = {
+ "power", "i2c",
+};
+
+#define AT24_NUM_SUPPLIES ARRAY_SIZE(at24_supply_names)
+
struct at24_client {
struct i2c_client *client;
struct regmap *regmap;
@@ -92,6 +99,8 @@ struct at24_data {
struct gpio_desc *wp_gpio;
+ bool has_supplies;
+ struct regulator_bulk_data supplies[AT24_NUM_SUPPLIES];
/*
* Some chips tie up multiple I2C addresses; dummy devices reserve
* them for us, and we'll use them with SMBus calls.
@@ -663,6 +672,17 @@ static int at24_probe(struct i2c_client *client)
at24->client[0].client = client;
at24->client[0].regmap = regmap;
+ for (i = 0; i < AT24_NUM_SUPPLIES; i++)
+ at24->supplies[i].supply = at24_supply_names[i];
+ err = devm_regulator_bulk_get(&at24->client[0].client->dev,
+ AT24_NUM_SUPPLIES,
+ at24->supplies);
+ if (err == -EPROBE_DEFER) {
+ dev_err(dev, "Failed to get power regulators\n");
+ return err;
+ }
+ at24->has_supplies = !err ? true : false;
+
at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);
if (IS_ERR(at24->wp_gpio))
return PTR_ERR(at24->wp_gpio);
@@ -705,13 +725,21 @@ static int at24_probe(struct i2c_client *client)
/* enable runtime pm */
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
+ pm_runtime_get_sync(dev);
+ if (at24->has_supplies) {
+ err = regulator_bulk_enable(AT24_NUM_SUPPLIES, at24->supplies);
+ if (err) {
+ dev_err(dev, "Failed to enable power regulators\n");
+ return err;
+ }
+ }
/*
* Perform a one-byte test read to verify that the
* chip is functional.
*/
err = at24_read(at24, 0, &test_byte, 1);
- pm_runtime_idle(dev);
+ pm_runtime_put(dev);
if (err) {
pm_runtime_disable(dev);
return -ENODEV;
@@ -726,15 +754,46 @@ 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);
pm_runtime_set_suspended(&client->dev);
+ if (at24->has_supplies)
+ regulator_bulk_disable(AT24_NUM_SUPPLIES, at24->supplies);
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);
+
+ if (at24->has_supplies)
+ return regulator_bulk_disable(AT24_NUM_SUPPLIES,
+ at24->supplies);
+
+ return 0;
+}
+
+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);
+
+ if (at24->has_supplies)
+ return regulator_bulk_enable(AT24_NUM_SUPPLIES,
+ at24->supplies);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(at24_pm_ops, at24_suspend, at24_resume);
+
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
