iio: imu: kmx61: Add acpi support

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c
index 5231d8f3b167..efb2f8b450c1 100644
--- a/drivers/iio/imu/kmx61.c
+++ b/drivers/iio/imu/kmx61.c
@@ -13,10 +13,13 @@
 
 #include <linux/module.h>
 #include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 
 #define KMX61_DRV_NAME "kmx61"
+#define KMX61_GPIO_NAME "kmx61_int"
 
 #define KMX61_REG_WHO_AM_I      0x00
 
@@ -573,6 +576,44 @@ static const struct iio_info kmx61_mag_info = {
         .attrs                  = &kmx61_mag_attribute_group,
 };
 
+static const char *kmx61_match_acpi_device(struct device *dev)
+{
+        const struct acpi_device_id *id;
+
+        id = acpi_match_device(dev->driver->acpi_match_table, dev);
+        if (!id)
+                return NULL;
+        return dev_name(dev);
+}
+
+static int kmx61_gpio_probe(struct i2c_client *client, struct kmx61_data *data)
+{
+        struct device *dev;
+        struct gpio_desc *gpio;
+        int ret;
+
+        if (!client)
+                return -EINVAL;
+
+        dev = &client->dev;
+
+        /* data ready gpio interrupt pin */
+        gpio = devm_gpiod_get_index(dev, KMX61_GPIO_NAME, 0);
+        if (IS_ERR(gpio)) {
+                dev_err(dev, "acpi gpio get index failed\n");
+                return PTR_ERR(gpio);
+        }
+
+        ret = gpiod_direction_input(gpio);
+        if (ret)
+                return ret;
+
+        ret = gpiod_to_irq(gpio);
+
+        dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
+        return ret;
+}
+
 static struct iio_dev *kmx61_indiodev_setup(struct kmx61_data *data,
                                             const struct iio_info *info,
                                             const struct iio_chan_spec *chan,
@@ -613,6 +654,13 @@ static int kmx61_probe(struct i2c_client *client,
 
         mutex_init(&data->lock);
 
+        if (id)
+                name = id->name;
+        else if (ACPI_HANDLE(&client->dev))
+                name = kmx61_match_acpi_device(&client->dev);
+        else
+                return -ENODEV;
+
         data->acc_indio_dev =
                 kmx61_indiodev_setup(data, &kmx61_acc_info,
                                      kmx61_acc_channels,
@@ -633,6 +681,9 @@ static int kmx61_probe(struct i2c_client *client,
         if (ret < 0)
                 return ret;
 
+        if (client->irq < 0)
+                client->irq = kmx61_gpio_probe(client, data);
+
         ret = iio_device_register(data->acc_indio_dev);
         if (ret < 0) {
                 dev_err(&client->dev, "Failed to register acc iio device\n");
@@ -668,6 +719,13 @@ static int kmx61_remove(struct i2c_client *client)
         return 0;
 }
 
+static const struct acpi_device_id kmx61_acpi_match[] = {
+        {"KMX61021", 0},
+        {}
+};
+
+MODULE_DEVICE_TABLE(acpi, kmx61_acpi_match);
+
 static const struct i2c_device_id kmx61_id[] = {
         {"kmx611021", 0},
         {}
@@ -678,6 +736,7 @@ MODULE_DEVICE_TABLE(i2c, kmx61_id);
 static struct i2c_driver kmx61_driver = {
         .driver = {
                 .name = KMX61_DRV_NAME,
+                .acpi_match_table = ACPI_PTR(kmx61_acpi_match),
         },
         .probe          = kmx61_probe,
         .remove         = kmx61_remove,