iio: ak8975 : Add AK8963 compatibility mode support

AK8963 and AK8975 use same register definitions, except the range
of X,Y,Z values. Added support of 8963 based on i2c_device_id.
Unfortunately there is no way to detect the type via registers,
both device registers return 0x48 as id of chipset.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

2 files changed, 31 insertions, 6 deletions

diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig
index d86d226dcd67..05a364c543f8 100644
--- a/drivers/iio/magnetometer/Kconfig
+++ b/drivers/iio/magnetometer/Kconfig
@@ -11,7 +11,8 @@ config AK8975
         depends on GPIOLIB
         help
           Say yes here to build support for Asahi Kasei AK8975 3-Axis
-          Magnetometer.
+          Magnetometer. This driver can also support AK8963, if i2c
+          device name is identified as ak8963.
 
           To compile this driver as a module, choose M here: the module
           will be called ak8975.
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 74866d1efd1b..0f1ca5303139 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -85,7 +85,14 @@
 #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 +108,7 @@ 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 +280,21 @@ 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;
 }
@@ -499,6 +519,9 @@ 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);
+
         /* Perform some basic start-of-day setup of the device. */
         err = ak8975_setup(client);
         if (err < 0) {
@@ -552,7 +575,8 @@ static int ak8975_remove(struct i2c_client *client)
 }
 
 static const struct i2c_device_id ak8975_id[] = {
-        {"ak8975", 0},
+        {"ak8975", AK8975},
+        {"ak8963", AK8963},
         {}
 };