iio: imu: kmx61: Add acpi support

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

diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c
index 5231d8f..efb2f8b 100644 (file)
--- 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,