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Date: Tue, 11 Dec 2018 05:06:20 +0000
From: Anson Huang <anson.huang@....com>
To: "jic23@...nel.org" <jic23@...nel.org>,
"knaack.h@....de" <knaack.h@....de>,
"lars@...afoo.de" <lars@...afoo.de>,
"pmeerw@...erw.net" <pmeerw@...erw.net>,
"rtresidd@...ctromag.com.au" <rtresidd@...ctromag.com.au>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"festevam@...il.com" <festevam@...il.com>,
"preid@...ctromag.com.au" <preid@...ctromag.com.au>
CC: dl-linux-imx <linux-imx@....com>
Subject: [PATCH V4] iio: magnetometer: mag3110: add optional vdd/vddio
regulator operation support
The magnetometer's power supply could be controlled by regulator
on some platforms, such as i.MX6Q-SABRESD board, the mag3110's
power supply is controlled by a GPIO fixed regulator, need to make
sure the regulator is enabled before any communication with mag3110,
this patch adds optional vdd/vddio regulator operation support.
Signed-off-by: Anson Huang <Anson.Huang@....com>
---
ChangeLog since V3:
- add disabling vdd in vddio error path;
- improve the regulator enable/disable sequence.
---
drivers/iio/magnetometer/mag3110.c | 96 ++++++++++++++++++++++++++++++++++----
1 file changed, 88 insertions(+), 8 deletions(-)
diff --git a/drivers/iio/magnetometer/mag3110.c b/drivers/iio/magnetometer/mag3110.c
index f063355..328c0c4 100644
--- a/drivers/iio/magnetometer/mag3110.c
+++ b/drivers/iio/magnetometer/mag3110.c
@@ -20,6 +20,7 @@
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
#define MAG3110_STATUS 0x00
#define MAG3110_OUT_X 0x01 /* MSB first */
@@ -56,6 +57,8 @@ struct mag3110_data {
struct mutex lock;
u8 ctrl_reg1;
int sleep_val;
+ struct regulator *vdd_reg;
+ struct regulator *vddio_reg;
};
static int mag3110_request(struct mag3110_data *data)
@@ -469,17 +472,46 @@ static int mag3110_probe(struct i2c_client *client,
struct iio_dev *indio_dev;
int ret;
- ret = i2c_smbus_read_byte_data(client, MAG3110_WHO_AM_I);
- if (ret < 0)
- return ret;
- if (ret != MAG3110_DEVICE_ID)
- return -ENODEV;
-
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
+
+ data->vdd_reg = devm_regulator_get_optional(&client->dev, "vdd");
+ if (!IS_ERR(data->vdd_reg)) {
+ ret = regulator_enable(data->vdd_reg);
+ if (ret) {
+ dev_err(&client->dev, "failed to enable VDD regulator\n");
+ return ret;
+ }
+ } else {
+ ret = PTR_ERR(data->vdd_reg);
+ if (ret != -ENODEV)
+ return ret;
+ }
+
+ data->vddio_reg = devm_regulator_get_optional(&client->dev, "vddio");
+ if (!IS_ERR(data->vddio_reg)) {
+ ret = regulator_enable(data->vddio_reg);
+ if (ret) {
+ dev_err(&client->dev, "failed to enable VDDIO regulator\n");
+ goto disable_regulator_vdd;
+ }
+ } else {
+ ret = PTR_ERR(data->vddio_reg);
+ if (ret != -ENODEV)
+ goto disable_regulator_vdd;
+ }
+
+ ret = i2c_smbus_read_byte_data(client, MAG3110_WHO_AM_I);
+ if (ret < 0)
+ goto disable_regulators;
+ if (ret != MAG3110_DEVICE_ID) {
+ ret = -ENODEV;
+ goto disable_regulators;
+ }
+
data->client = client;
mutex_init(&data->lock);
@@ -499,7 +531,7 @@ static int mag3110_probe(struct i2c_client *client,
ret = mag3110_change_config(data, MAG3110_CTRL_REG1, data->ctrl_reg1);
if (ret < 0)
- return ret;
+ goto disable_regulators;
ret = i2c_smbus_write_byte_data(client, MAG3110_CTRL_REG2,
MAG3110_CTRL_AUTO_MRST_EN);
@@ -520,6 +552,13 @@ static int mag3110_probe(struct i2c_client *client,
iio_triggered_buffer_cleanup(indio_dev);
standby_on_error:
mag3110_standby(iio_priv(indio_dev));
+disable_regulators:
+ if (!IS_ERR(data->vddio_reg))
+ regulator_disable(data->vddio_reg);
+disable_regulator_vdd:
+ if (!IS_ERR(data->vdd_reg))
+ regulator_disable(data->vdd_reg);
+
return ret;
}
@@ -537,14 +576,55 @@ static int mag3110_remove(struct i2c_client *client)
#ifdef CONFIG_PM_SLEEP
static int mag3110_suspend(struct device *dev)
{
- return mag3110_standby(iio_priv(i2c_get_clientdata(
+ struct mag3110_data *data = iio_priv(i2c_get_clientdata(
+ to_i2c_client(dev)));
+ int ret;
+
+ ret = mag3110_standby(iio_priv(i2c_get_clientdata(
to_i2c_client(dev))));
+ if (ret)
+ return ret;
+
+ if (!IS_ERR(data->vddio_reg)) {
+ ret = regulator_disable(data->vddio_reg);
+ if (ret) {
+ dev_err(dev, "failed to disable VDDIO regulator\n");
+ return ret;
+ }
+ }
+ if (!IS_ERR(data->vdd_reg)) {
+ ret = regulator_disable(data->vdd_reg);
+ if (ret) {
+ dev_err(dev, "failed to disable VDD regulator\n");
+ return ret;
+ }
+ }
+
+ return 0;
}
static int mag3110_resume(struct device *dev)
{
struct mag3110_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
+ int ret;
+
+ if (!IS_ERR(data->vdd_reg)) {
+ ret = regulator_enable(data->vdd_reg);
+ if (ret) {
+ dev_err(dev, "failed to enable VDD regulator\n");
+ return ret;
+ }
+ }
+ if (!IS_ERR(data->vddio_reg)) {
+ ret = regulator_enable(data->vddio_reg);
+ if (ret) {
+ dev_err(dev, "failed to enable VDDIO regulator\n");
+ if (!IS_ERR(data->vdd_reg))
+ regulator_disable(data->vdd_reg);
+ return ret;
+ }
+ }
return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
data->ctrl_reg1);
--
2.7.4
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