iio: accel: kxcjk1013: Add rudimentary regulator support

kxcjk1013 devices have VDD and VDDIO power lines. Need
to make sure the regulators are enabled before any
communication with kxcjk1013. This patch introduces
vdd/vddio regulators for kxcjk1013.

Signed-off-by: Devajith V S <devajithvs@gmail.com>
Link: https://lore.kernel.org/r/20201213172437.2779-2-devajithvs@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index e92c7e6766e11996eead49c954d8ddca6a6e937c..2fadafc860fd6d7289ccc25345c44bb4bb16eb53 100644 (file)
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -14,6 +14,7 @@
 #include <linux/acpi.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/buffer.h>
@@ -133,6 +134,7 @@ enum kx_acpi_type {
 };
 
 struct kxcjk1013_data {
+       struct regulator_bulk_data regulators[2];
        struct i2c_client *client;
        struct iio_trigger *dready_trig;
        struct iio_trigger *motion_trig;
@@ -1300,6 +1302,13 @@ static const char *kxcjk1013_match_acpi_device(struct device *dev,
        return dev_name(dev);
 }
 
+static void kxcjk1013_disable_regulators(void *d)
+{
+       struct kxcjk1013_data *data = d;
+
+       regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
+}
+
 static int kxcjk1013_probe(struct i2c_client *client,
                           const struct i2c_device_id *id)
 {
@@ -1330,6 +1339,29 @@ static int kxcjk1013_probe(struct i2c_client *client,
                        return ret;
        }
 
+       data->regulators[0].supply = "vdd";
+       data->regulators[1].supply = "vddio";
+       ret = devm_regulator_bulk_get(&client->dev, ARRAY_SIZE(data->regulators),
+                                     data->regulators);
+       if (ret)
+               return dev_err_probe(&client->dev, ret, "Failed to get regulators\n");
+
+       ret = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
+                                   data->regulators);
+       if (ret)
+               return ret;
+
+       ret = devm_add_action_or_reset(&client->dev, kxcjk1013_disable_regulators, data);
+       if (ret)
+               return ret;
+
+       /*
+        * A typical delay of 10ms is required for powering up
+        * according to the data sheets of supported chips.
+        * Hence double that to play safe.
+        */
+       msleep(20);
+
        if (id) {
                data->chipset = (enum kx_chipset)(id->driver_data);
                name = id->name;