[PATCH v4 2/6] iio: imu: kmx61: Add acpi support

Daniel Baluta
2014-12-03T13:46:26Z

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
---
drivers/iio/imu/kmx61.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)

diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c
index 5b44371..893f7c8 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,
--
1.9.1