Merge tag 'at24-updates-for-v5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into i2c/for-5.6

at24 updates for linux v5.6

- minor maintenance: update the license tag, sort headers
- move support for the write-protect pin into nvmem core
- add a reference to the new wp-gpios property in nvmem to at25 bindings
- add support for regulator and pm_runtime control

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),
 	},