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-rw-r--r--drivers/misc/eeprom/at24.c72
1 files changed, 51 insertions, 21 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 0681d5fdd538..031eb64549af 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* at24.c - handle most I2C EEPROMs
*
@@ -6,23 +6,23 @@
* Copyright (C) 2008 Wolfram Sang, Pengutronix
*/
-#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
#include <linux/module.h>
-#include <linux/of_device.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
#include <linux/mutex.h>
-#include <linux/mod_devicetable.h>
-#include <linux/bitops.h>
-#include <linux/jiffies.h>
-#include <linux/property.h>
-#include <linux/acpi.h>
-#include <linux/i2c.h>
#include <linux/nvmem-provider.h>
-#include <linux/regmap.h>
+#include <linux/of_device.h>
#include <linux/pm_runtime.h>
-#include <linux/gpio/consumer.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
/* Address pointer is 16 bit. */
#define AT24_FLAG_ADDR16 BIT(7)
@@ -88,8 +88,7 @@ struct at24_data {
u8 flags;
struct nvmem_device *nvmem;
-
- struct gpio_desc *wp_gpio;
+ struct regulator *vcc_reg;
/*
* Some chips tie up multiple I2C addresses; dummy devices reserve
@@ -457,12 +456,10 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
* from this host, but not from other I2C masters.
*/
mutex_lock(&at24->lock);
- gpiod_set_value_cansleep(at24->wp_gpio, 0);
while (count) {
ret = at24_regmap_write(at24, buf, off, count);
if (ret < 0) {
- gpiod_set_value_cansleep(at24->wp_gpio, 1);
mutex_unlock(&at24->lock);
pm_runtime_put(dev);
return ret;
@@ -472,7 +469,6 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
count -= ret;
}
- gpiod_set_value_cansleep(at24->wp_gpio, 1);
mutex_unlock(&at24->lock);
pm_runtime_put(dev);
@@ -662,9 +658,9 @@ static int at24_probe(struct i2c_client *client)
at24->client[0].client = client;
at24->client[0].regmap = regmap;
- at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);
- if (IS_ERR(at24->wp_gpio))
- return PTR_ERR(at24->wp_gpio);
+ 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) {
@@ -701,6 +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);
@@ -713,6 +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;
}
@@ -728,15 +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),
},