[Patch v1 2/2] iio: ak8975: Added ACPI enumeration

Srinivas Pandruvada
2014-03-19T16:56:07Z

Added capability so that this device can be enumerated via ACPI.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
drivers/iio/magnetometer/ak8975.c | 40 ++++++++++++++++++++++++++++++++++++---
1 file changed, 37 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index aa7682d..09ea5c4 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -31,6 +31,7 @@
#include <linux/bitops.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
+#include <linux/acpi.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -475,6 +476,27 @@ static const struct iio_info ak8975_info = {
.driver_module = THIS_MODULE,
};

+static const struct acpi_device_id ak_acpi_match[] = {
+ {"AK8975", AK8975},
+ {"AK8963", AK8963},
+ {"INVN6500", AK8963},
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, ak_acpi_match);
+
+static char *ak8975_match_acpi_device(struct device *dev,
+ enum asahi_compass_chipset *chipset)
+{
+ const struct acpi_device_id *id;
+
+ id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!id)
+ return NULL;
+ *chipset = (int)id->driver_data;
+
+ return (char *)dev_name(dev);
+}
+
static int ak8975_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -482,6 +504,7 @@ static int ak8975_probe(struct i2c_client *client,
struct iio_dev *indio_dev;
int eoc_gpio;
int err;
+ char *name = NULL;

/* Grab and set up the supplied GPIO. */
if (client->dev.platform_data)
@@ -519,8 +542,18 @@ static int ak8975_probe(struct i2c_client *client,
data->eoc_gpio = eoc_gpio;
data->eoc_irq = 0;

- data->chipset = (enum asahi_compass_chipset)(id->driver_data);
- dev_dbg(&client->dev, "Asahi compass chip %s\n", id->name);
+ /* id will be NULL when enumerated via ACPI */
+ if (id) {
+ data->chipset =
+ (enum asahi_compass_chipset)(id->driver_data);
+ name = (char *) id->name;
+ } else if (ACPI_HANDLE(&client->dev))
+ name = ak8975_match_acpi_device(&client->dev, &data->chipset);
+ else {
+ err = -ENOSYS;
+ goto exit_free_iio;
+ }
+ dev_dbg(&client->dev, "Asahi compass chip %s\n", name);

/* Perform some basic start-of-day setup of the device. */
err = ak8975_setup(client);
@@ -537,7 +570,7 @@ static int ak8975_probe(struct i2c_client *client,
indio_dev->num_channels = ARRAY_SIZE(ak8975_channels);
indio_dev->info = &ak8975_info;
indio_dev->modes = INDIO_DIRECT_MODE;
-
+ indio_dev->name = name;
err = iio_device_register(indio_dev);
if (err < 0)
goto exit_free_iio;
@@ -592,6 +625,7 @@ static struct i2c_driver ak8975_driver = {
.driver = {
.name = "ak8975",
.of_match_table = ak8975_of_match,
+ .acpi_match_table = ACPI_PTR(ak_acpi_match),
},
.probe = ak8975_probe,
.remove = ak8975_remove,
--
1.7.11.7