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path: root/drivers/iio/magnetometer/ak8975.c
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Diffstat (limited to 'drivers/iio/magnetometer/ak8975.c')
-rw-r--r--drivers/iio/magnetometer/ak8975.c71
1 files changed, 64 insertions, 7 deletions
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 74866d1efd1b..09ea5c481f4c 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>
@@ -85,7 +86,14 @@
#define AK8975_MAX_CONVERSION_TIMEOUT 500
#define AK8975_CONVERSION_DONE_POLL_TIME 10
#define AK8975_DATA_READY_TIMEOUT ((100*HZ)/1000)
-#define RAW_TO_GAUSS(asa) ((((asa) + 128) * 3000) / 256)
+#define RAW_TO_GAUSS_8975(asa) ((((asa) + 128) * 3000) / 256)
+#define RAW_TO_GAUSS_8963(asa) ((((asa) + 128) * 6000) / 256)
+
+/* Compatible Asahi Kasei Compass parts */
+enum asahi_compass_chipset {
+ AK8975,
+ AK8963,
+};
/*
* Per-instance context data for the device.
@@ -101,6 +109,7 @@ struct ak8975_data {
int eoc_irq;
wait_queue_head_t data_ready_queue;
unsigned long flags;
+ enum asahi_compass_chipset chipset;
};
static const int ak8975_index_to_reg[] = {
@@ -272,9 +281,21 @@ static int ak8975_setup(struct i2c_client *client)
* Since ASA doesn't change, we cache the resultant scale factor into the
* device context in ak8975_setup().
*/
- data->raw_to_gauss[0] = RAW_TO_GAUSS(data->asa[0]);
- data->raw_to_gauss[1] = RAW_TO_GAUSS(data->asa[1]);
- data->raw_to_gauss[2] = RAW_TO_GAUSS(data->asa[2]);
+ if (data->chipset == AK8963) {
+ /*
+ * H range is +-8190 and magnetometer range is +-4912.
+ * So HuT using the above explanation for 8975,
+ * 4912/8190 = ~ 6/10.
+ * So the Hadj should use 6/10 instead of 3/10.
+ */
+ data->raw_to_gauss[0] = RAW_TO_GAUSS_8963(data->asa[0]);
+ data->raw_to_gauss[1] = RAW_TO_GAUSS_8963(data->asa[1]);
+ data->raw_to_gauss[2] = RAW_TO_GAUSS_8963(data->asa[2]);
+ } else {
+ data->raw_to_gauss[0] = RAW_TO_GAUSS_8975(data->asa[0]);
+ data->raw_to_gauss[1] = RAW_TO_GAUSS_8975(data->asa[1]);
+ data->raw_to_gauss[2] = RAW_TO_GAUSS_8975(data->asa[2]);
+ }
return 0;
}
@@ -455,6 +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)
{
@@ -462,6 +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)
@@ -499,6 +542,19 @@ static int ak8975_probe(struct i2c_client *client,
data->eoc_gpio = eoc_gpio;
data->eoc_irq = 0;
+ /* 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);
if (err < 0) {
@@ -513,9 +569,8 @@ static int ak8975_probe(struct i2c_client *client,
indio_dev->channels = ak8975_channels;
indio_dev->num_channels = ARRAY_SIZE(ak8975_channels);
indio_dev->info = &ak8975_info;
- indio_dev->name = id->name;
indio_dev->modes = INDIO_DIRECT_MODE;
-
+ indio_dev->name = name;
err = iio_device_register(indio_dev);
if (err < 0)
goto exit_free_iio;
@@ -552,7 +607,8 @@ static int ak8975_remove(struct i2c_client *client)
}
static const struct i2c_device_id ak8975_id[] = {
- {"ak8975", 0},
+ {"ak8975", AK8975},
+ {"ak8963", AK8963},
{}
};
@@ -569,6 +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,