iio: ak8975: add ak09911 and ak09912 support

Add 2 new definition entries to support ak0991x compass.
Add a more advanced function to check we are dealing with the
expected device.
Remove standalone driver for ak09911.

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

4 files changed, 185 insertions, 353 deletions

diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig
index b2dba9e506ab..4c7a4c52dd06 100644
--- a/drivers/iio/magnetometer/Kconfig
+++ b/drivers/iio/magnetometer/Kconfig
@@ -6,26 +6,21 @@
 menu "Magnetometer sensors"
 
 config AK8975
-        tristate "Asahi Kasei AK8975 3-Axis Magnetometer"
+        tristate "Asahi Kasei AK 3-Axis Magnetometer"
         depends on I2C
         depends on GPIOLIB
         help
-          Say yes here to build support for Asahi Kasei AK8975 3-Axis
-          Magnetometer. This driver can also support AK8963, if i2c
-          device name is identified as ak8963.
+          Say yes here to build support for Asahi Kasei AK8975, AK8963,
+          AK09911 or AK09912 3-Axis Magnetometer.
 
           To compile this driver as a module, choose M here: the module
           will be called ak8975.
 
 config AK09911
         tristate "Asahi Kasei AK09911 3-axis Compass"
-        depends on I2C
+        select AK8975
         help
-          Say yes here to build support for Asahi Kasei AK09911 3-Axis
-          Magnetometer.
-
-          To compile this driver as a module, choose M here: the module
-          will be called ak09911.
+          Deprecated: AK09911 is now supported by AK8975 driver.
 
 config MAG3110
         tristate "Freescale MAG3110 3-Axis Magnetometer"
diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/Makefile
index b91315e0b826..0f5d3c985799 100644
--- a/drivers/iio/magnetometer/Makefile
+++ b/drivers/iio/magnetometer/Makefile
@@ -3,7 +3,6 @@
 #
 
 # When adding new entries keep the list in alphabetical order
-obj-$(CONFIG_AK09911)   += ak09911.o
 obj-$(CONFIG_AK8975)    += ak8975.o
 obj-$(CONFIG_MAG3110)   += mag3110.o
 obj-$(CONFIG_HID_SENSOR_MAGNETOMETER_3D) += hid-sensor-magn-3d.o
diff --git a/drivers/iio/magnetometer/ak09911.c b/drivers/iio/magnetometer/ak09911.c
deleted file mode 100644
index b2bc942ff6b8..000000000000
--- a/drivers/iio/magnetometer/ak09911.c
+++ /dev/null
@@ -1,326 +0,0 @@
-/*
- * AK09911 3-axis compass driver
- * Copyright (c) 2014, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/i2c.h>
-#include <linux/acpi.h>
-#include <linux/iio/iio.h>
-
-#define AK09911_REG_WIA1                0x00
-#define AK09911_REG_WIA2                0x01
-#define AK09911_WIA1_VALUE              0x48
-#define AK09911_WIA2_VALUE              0x05
-
-#define AK09911_REG_ST1                 0x10
-#define AK09911_REG_HXL                 0x11
-#define AK09911_REG_HXH                 0x12
-#define AK09911_REG_HYL                 0x13
-#define AK09911_REG_HYH                 0x14
-#define AK09911_REG_HZL                 0x15
-#define AK09911_REG_HZH                 0x16
-
-#define AK09911_REG_ASAX                0x60
-#define AK09911_REG_ASAY                0x61
-#define AK09911_REG_ASAZ                0x62
-
-#define AK09911_REG_CNTL1               0x30
-#define AK09911_REG_CNTL2               0x31
-#define AK09911_REG_CNTL3               0x32
-
-#define AK09911_MODE_SNG_MEASURE        0x01
-#define AK09911_MODE_SELF_TEST          0x10
-#define AK09911_MODE_FUSE_ACCESS        0x1F
-#define AK09911_MODE_POWERDOWN          0x00
-#define AK09911_RESET_DATA              0x01
-
-#define AK09911_REG_CNTL1               0x30
-#define AK09911_REG_CNTL2               0x31
-#define AK09911_REG_CNTL3               0x32
-
-#define AK09911_RAW_TO_GAUSS(asa)       ((((asa) + 128) * 6000) / 256)
-
-#define AK09911_MAX_CONVERSION_TIMEOUT_MS       500
-#define AK09911_CONVERSION_DONE_POLL_TIME_MS    10
-
-struct ak09911_data {
-        struct i2c_client       *client;
-        struct mutex            lock;
-        u8                      asa[3];
-        long                    raw_to_gauss[3];
-};
-
-static const int ak09911_index_to_reg[] = {
-        AK09911_REG_HXL, AK09911_REG_HYL, AK09911_REG_HZL,
-};
-
-static int ak09911_set_mode(struct i2c_client *client, u8 mode)
-{
-        int ret;
-
-        switch (mode) {
-        case AK09911_MODE_SNG_MEASURE:
-        case AK09911_MODE_SELF_TEST:
-        case AK09911_MODE_FUSE_ACCESS:
-        case AK09911_MODE_POWERDOWN:
-                ret = i2c_smbus_write_byte_data(client,
-                                                AK09911_REG_CNTL2, mode);
-                if (ret < 0) {
-                        dev_err(&client->dev, "set_mode error\n");
-                        return ret;
-                }
-                /* After mode change wait atleast 100us */
-                usleep_range(100, 500);
-                break;
-        default:
-                dev_err(&client->dev,
-                        "%s: Unknown mode(%d).", __func__, mode);
-                return -EINVAL;
-        }
-
-        return ret;
-}
-
-/* Get Sensitivity Adjustment value */
-static int ak09911_get_asa(struct i2c_client *client)
-{
-        struct iio_dev *indio_dev = i2c_get_clientdata(client);
-        struct ak09911_data *data = iio_priv(indio_dev);
-        int ret;
-
-        ret = ak09911_set_mode(client, AK09911_MODE_FUSE_ACCESS);
-        if (ret < 0)
-                return ret;
-
-        /* Get asa data and store in the device data. */
-        ret = i2c_smbus_read_i2c_block_data(client, AK09911_REG_ASAX,
-                                            3, data->asa);
-        if (ret < 0) {
-                dev_err(&client->dev, "Not able to read asa data\n");
-                return ret;
-        }
-
-        ret = ak09911_set_mode(client,  AK09911_MODE_POWERDOWN);
-        if (ret < 0)
-                return ret;
-
-        data->raw_to_gauss[0] = AK09911_RAW_TO_GAUSS(data->asa[0]);
-        data->raw_to_gauss[1] = AK09911_RAW_TO_GAUSS(data->asa[1]);
-        data->raw_to_gauss[2] = AK09911_RAW_TO_GAUSS(data->asa[2]);
-
-        return 0;
-}
-
-static int ak09911_verify_chip_id(struct i2c_client *client)
-{
-        u8 wia_val[2];
-        int ret;
-
-        ret = i2c_smbus_read_i2c_block_data(client, AK09911_REG_WIA1,
-                                            2, wia_val);
-        if (ret < 0) {
-                dev_err(&client->dev, "Error reading WIA\n");
-                return ret;
-        }
-
-        dev_dbg(&client->dev, "WIA %02x %02x\n", wia_val[0], wia_val[1]);
-
-        if (wia_val[0] != AK09911_WIA1_VALUE ||
-                wia_val[1] != AK09911_WIA2_VALUE) {
-                dev_err(&client->dev, "Device ak09911 not found\n");
-                return -ENODEV;
-        }
-
-        return 0;
-}
-
-static int wait_conversion_complete_polled(struct ak09911_data *data)
-{
-        struct i2c_client *client = data->client;
-        u8 read_status;
-        u32 timeout_ms = AK09911_MAX_CONVERSION_TIMEOUT_MS;
-        int ret;
-
-        /* Wait for the conversion to complete. */
-        while (timeout_ms) {
-                msleep_interruptible(AK09911_CONVERSION_DONE_POLL_TIME_MS);
-                ret = i2c_smbus_read_byte_data(client, AK09911_REG_ST1);
-                if (ret < 0) {
-                        dev_err(&client->dev, "Error in reading ST1\n");
-                        return ret;
-                }
-                read_status = ret & 0x01;
-                if (read_status)
-                        break;
-                timeout_ms -= AK09911_CONVERSION_DONE_POLL_TIME_MS;
-        }
-        if (!timeout_ms) {
-                dev_err(&client->dev, "Conversion timeout happened\n");
-                return -EIO;
-        }
-
-        return read_status;
-}
-
-static int ak09911_read_axis(struct iio_dev *indio_dev, int index, int *val)
-{
-        struct ak09911_data *data = iio_priv(indio_dev);
-        struct i2c_client *client = data->client;
-        int ret;
-
-        mutex_lock(&data->lock);
-
-        ret = ak09911_set_mode(client, AK09911_MODE_SNG_MEASURE);
-        if (ret < 0)
-                goto fn_exit;
-
-        ret = wait_conversion_complete_polled(data);
-        if (ret < 0)
-                goto fn_exit;
-
-        /* Read data */
-        ret = i2c_smbus_read_word_data(client, ak09911_index_to_reg[index]);
-        if (ret < 0) {
-                dev_err(&client->dev, "Read axis data fails\n");
-                goto fn_exit;
-        }
-
-        mutex_unlock(&data->lock);
-
-        /* Clamp to valid range. */
-        *val = sign_extend32(clamp_t(s16, ret, -8192, 8191), 13);
-
-        return IIO_VAL_INT;
-
-fn_exit:
-        mutex_unlock(&data->lock);
-
-        return ret;
-}
-
-static int ak09911_read_raw(struct iio_dev *indio_dev,
-                            struct iio_chan_spec const *chan,
-                            int *val, int *val2,
-                            long mask)
-{
-        struct ak09911_data *data = iio_priv(indio_dev);
-
-        switch (mask) {
-        case IIO_CHAN_INFO_RAW:
-                return ak09911_read_axis(indio_dev, chan->address, val);
-        case IIO_CHAN_INFO_SCALE:
-                *val = 0;
-                *val2 = data->raw_to_gauss[chan->address];
-                return IIO_VAL_INT_PLUS_MICRO;
-        }
-
-        return -EINVAL;
-}
-
-#define AK09911_CHANNEL(axis, index)                                    \
-        {                                                               \
-                .type = IIO_MAGN,                                       \
-                .modified = 1,                                          \
-                .channel2 = IIO_MOD_##axis,                             \
-                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
-                             BIT(IIO_CHAN_INFO_SCALE),                  \
-                .address = index,                                       \
-        }
-
-static const struct iio_chan_spec ak09911_channels[] = {
-        AK09911_CHANNEL(X, 0), AK09911_CHANNEL(Y, 1), AK09911_CHANNEL(Z, 2),
-};
-
-static const struct iio_info ak09911_info = {
-        .read_raw = &ak09911_read_raw,
-        .driver_module = THIS_MODULE,
-};
-
-static const struct acpi_device_id ak_acpi_match[] = {
-        {"AK009911", 0},
-        { },
-};
-MODULE_DEVICE_TABLE(acpi, ak_acpi_match);
-
-static int ak09911_probe(struct i2c_client *client,
-                         const struct i2c_device_id *id)
-{
-        struct iio_dev *indio_dev;
-        struct ak09911_data *data;
-        const char *name;
-        int ret;
-
-        ret = ak09911_verify_chip_id(client);
-        if (ret) {
-                dev_err(&client->dev, "AK00911 not detected\n");
-                return -ENODEV;
-        }
-
-        indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
-        if (indio_dev == NULL)
-                return -ENOMEM;
-
-        data = iio_priv(indio_dev);
-        i2c_set_clientdata(client, indio_dev);
-
-        data->client = client;
-        mutex_init(&data->lock);
-
-        ret = ak09911_get_asa(client);
-        if (ret)
-                return ret;
-
-        if (id)
-                name = id->name;
-        else if (ACPI_HANDLE(&client->dev))
-                name = dev_name(&client->dev);
-        else
-                return -ENODEV;
-
-        dev_dbg(&client->dev, "Asahi compass chip %s\n", name);
-
-        indio_dev->dev.parent = &client->dev;
-        indio_dev->channels = ak09911_channels;
-        indio_dev->num_channels = ARRAY_SIZE(ak09911_channels);
-        indio_dev->info = &ak09911_info;
-        indio_dev->modes = INDIO_DIRECT_MODE;
-        indio_dev->name = name;
-
-        return devm_iio_device_register(&client->dev, indio_dev);
-}
-
-static const struct i2c_device_id ak09911_id[] = {
-        {"ak09911", 0},
-        {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ak09911_id);
-
-static struct i2c_driver ak09911_driver = {
-        .driver = {
-                .name   = "ak09911",
-                .acpi_match_table = ACPI_PTR(ak_acpi_match),
-        },
-        .probe          = ak09911_probe,
-        .id_table       = ak09911_id,
-};
-module_i2c_driver(ak09911_driver);
-
-MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
-MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("AK09911 Compass driver");
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 0f86a8e72034..0d10a4baceb6 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -81,6 +81,58 @@
 #define AK8975_MAX_REGS                 AK8975_REG_ASAZ
 
 /*
+ * AK09912 Register definitions
+ */
+#define AK09912_REG_WIA1                0x00
+#define AK09912_REG_WIA2                0x01
+#define AK09912_DEVICE_ID               0x04
+#define AK09911_DEVICE_ID               0x05
+
+#define AK09911_REG_INFO1               0x02
+#define AK09911_REG_INFO2               0x03
+
+#define AK09912_REG_ST1                 0x10
+
+#define AK09912_REG_ST1_DRDY_SHIFT      0
+#define AK09912_REG_ST1_DRDY_MASK       (1 << AK09912_REG_ST1_DRDY_SHIFT)
+
+#define AK09912_REG_HXL                 0x11
+#define AK09912_REG_HXH                 0x12
+#define AK09912_REG_HYL                 0x13
+#define AK09912_REG_HYH                 0x14
+#define AK09912_REG_HZL                 0x15
+#define AK09912_REG_HZH                 0x16
+#define AK09912_REG_TMPS                0x17
+
+#define AK09912_REG_ST2                 0x18
+#define AK09912_REG_ST2_HOFL_SHIFT      3
+#define AK09912_REG_ST2_HOFL_MASK       (1 << AK09912_REG_ST2_HOFL_SHIFT)
+
+#define AK09912_REG_CNTL1               0x30
+
+#define AK09912_REG_CNTL2               0x31
+#define AK09912_REG_CNTL_MODE_POWER_DOWN        0x00
+#define AK09912_REG_CNTL_MODE_ONCE      0x01
+#define AK09912_REG_CNTL_MODE_SELF_TEST 0x10
+#define AK09912_REG_CNTL_MODE_FUSE_ROM  0x1F
+#define AK09912_REG_CNTL2_MODE_SHIFT    0
+#define AK09912_REG_CNTL2_MODE_MASK     (0x1F << AK09912_REG_CNTL2_MODE_SHIFT)
+
+#define AK09912_REG_CNTL3               0x32
+
+#define AK09912_REG_TS1                 0x33
+#define AK09912_REG_TS2                 0x34
+#define AK09912_REG_TS3                 0x35
+#define AK09912_REG_I2CDIS              0x36
+#define AK09912_REG_TS4                 0x37
+
+#define AK09912_REG_ASAX                0x60
+#define AK09912_REG_ASAY                0x61
+#define AK09912_REG_ASAZ                0x62
+
+#define AK09912_MAX_REGS                AK09912_REG_ASAZ
+
+/*
  * Miscellaneous values.
  */
 #define AK8975_MAX_CONVERSION_TIMEOUT   500
@@ -130,22 +182,38 @@ static long ak8975_raw_to_gauss(u16 data)
 }
 
 /*
- * For AK8963, same calculation, but the device is less sensitive:
+ * For AK8963 and AK09911, same calculation, but the device is less sensitive:
  *
  * H is in the range of +-8190.  The magnetometer has a range of
  * +-4912uT.  To go from the raw value to uT is:
  *
  * HuT = H * 4912/8190, or roughly, 6/10, instead of 3/10.
  */
-static long ak8963_raw_to_gauss(u16 data)
+
+static long ak8963_09911_raw_to_gauss(u16 data)
 {
         return (((long)data + 128) * 6000) / 256;
 }
 
+/*
+ * For AK09912, same calculation, except the device is more sensitive:
+ *
+ * H is in the range of -32752 to 32752.  The magnetometer has a range of
+ * +-4912uT.  To go from the raw value to uT is:
+ *
+ * HuT = H * 4912/32752, or roughly, 3/20, instead of 3/10.
+ */
+static long ak09912_raw_to_gauss(u16 data)
+{
+        return (((long)data + 128) * 1500) / 256;
+}
+
 /* Compatible Asahi Kasei Compass parts */
 enum asahi_compass_chipset {
         AK8975,
         AK8963,
+        AK09911,
+        AK09912,
         AK_MAX_TYPE
 };
 
@@ -212,7 +280,7 @@ static struct ak_def ak_def_array[AK_MAX_TYPE] = {
         },
         {
                 .type = AK8963,
-                .raw_to_gauss = ak8963_raw_to_gauss,
+                .raw_to_gauss = ak8963_09911_raw_to_gauss,
                 .range = 8190,
                 .ctrl_regs = {
                         AK8975_REG_ST1,
@@ -235,6 +303,56 @@ static struct ak_def ak_def_array[AK_MAX_TYPE] = {
                         AK8975_REG_HYL,
                         AK8975_REG_HZL},
         },
+        {
+                .type = AK09911,
+                .raw_to_gauss = ak8963_09911_raw_to_gauss,
+                .range = 8192,
+                .ctrl_regs = {
+                        AK09912_REG_ST1,
+                        AK09912_REG_ST2,
+                        AK09912_REG_CNTL2,
+                        AK09912_REG_ASAX,
+                        AK09912_MAX_REGS},
+                .ctrl_masks = {
+                        AK09912_REG_ST1_DRDY_MASK,
+                        AK09912_REG_ST2_HOFL_MASK,
+                        0,
+                        AK09912_REG_CNTL2_MODE_MASK},
+                .ctrl_modes = {
+                        AK09912_REG_CNTL_MODE_POWER_DOWN,
+                        AK09912_REG_CNTL_MODE_ONCE,
+                        AK09912_REG_CNTL_MODE_SELF_TEST,
+                        AK09912_REG_CNTL_MODE_FUSE_ROM},
+                .data_regs = {
+                        AK09912_REG_HXL,
+                        AK09912_REG_HYL,
+                        AK09912_REG_HZL},
+        },
+        {
+                .type = AK09912,
+                .raw_to_gauss = ak09912_raw_to_gauss,
+                .range = 32752,
+                .ctrl_regs = {
+                        AK09912_REG_ST1,
+                        AK09912_REG_ST2,
+                        AK09912_REG_CNTL2,
+                        AK09912_REG_ASAX,
+                        AK09912_MAX_REGS},
+                .ctrl_masks = {
+                        AK09912_REG_ST1_DRDY_MASK,
+                        AK09912_REG_ST2_HOFL_MASK,
+                        0,
+                        AK09912_REG_CNTL2_MODE_MASK},
+                .ctrl_modes = {
+                        AK09912_REG_CNTL_MODE_POWER_DOWN,
+                        AK09912_REG_CNTL_MODE_ONCE,
+                        AK09912_REG_CNTL_MODE_SELF_TEST,
+                        AK09912_REG_CNTL_MODE_FUSE_ROM},
+                .data_regs = {
+                        AK09912_REG_HXL,
+                        AK09912_REG_HYL,
+                        AK09912_REG_HZL},
+        }
 };
 
 /*
@@ -255,6 +373,52 @@ struct ak8975_data {
 };
 
 /*
+ * Return 0 if the i2c device is the one we expect.
+ * return a negative error number otherwise
+ */
+static int ak8975_who_i_am(struct i2c_client *client,
+                           enum asahi_compass_chipset type)
+{
+        u8 wia_val[2];
+        int ret;
+
+        /*
+         * Signature for each device:
+         * Device   |  WIA1      |  WIA2
+         * AK09912  |  DEVICE_ID |  AK09912_DEVICE_ID
+         * AK09911  |  DEVICE_ID |  AK09911_DEVICE_ID
+         * AK8975   |  DEVICE_ID |  NA
+         * AK8963   |  DEVICE_ID |  NA
+         */
+        ret = i2c_smbus_read_i2c_block_data(client, AK09912_REG_WIA1,
+                                            2, wia_val);
+        if (ret < 0) {
+                dev_err(&client->dev, "Error reading WIA\n");
+                return ret;
+        }
+
+        if (wia_val[0] != AK8975_DEVICE_ID)
+                return -ENODEV;
+
+        switch (type) {
+        case AK8975:
+        case AK8963:
+                return 0;
+        case AK09911:
+                if (wia_val[1] == AK09911_DEVICE_ID)
+                        return 0;
+                break;
+        case AK09912:
+                if (wia_val[1] == AK09912_DEVICE_ID)
+                        return 0;
+                break;
+        default:
+                dev_err(&client->dev, "Type %d unknown\n", type);
+        }
+        return -ENODEV;
+}
+
+/*
  * Helper function to write to CNTL register.
  */
 static int ak8975_set_mode(struct ak8975_data *data, enum ak_ctrl_mode mode)
@@ -329,21 +493,8 @@ static int ak8975_setup(struct i2c_client *client)
 {
         struct iio_dev *indio_dev = i2c_get_clientdata(client);
         struct ak8975_data *data = iio_priv(indio_dev);
-        u8 device_id;
         int ret;
 
-        /* Confirm that the device we're talking to is really an AK8975. */
-        ret = i2c_smbus_read_byte_data(client, AK8975_REG_WIA);
-        if (ret < 0) {
-                dev_err(&client->dev, "Error reading WIA\n");
-                return ret;
-        }
-        device_id = ret;
-        if (device_id != AK8975_DEVICE_ID) {
-                dev_err(&client->dev, "Device ak8975 not found\n");
-                return -ENODEV;
-        }
-
         /* Write the fused rom access mode. */
         ret = ak8975_set_mode(data, FUSE_ROM);
         if (ret < 0) {
@@ -554,6 +705,8 @@ static const struct acpi_device_id ak_acpi_match[] = {
         {"AK8975", AK8975},
         {"AK8963", AK8963},
         {"INVN6500", AK8963},
+        {"AK09911", AK09911},
+        {"AK09912", AK09912},
         { },
 };
 MODULE_DEVICE_TABLE(acpi, ak_acpi_match);
@@ -633,6 +786,11 @@ static int ak8975_probe(struct i2c_client *client,
         }
 
         data->def = &ak_def_array[chipset];
+        err = ak8975_who_i_am(client, data->def->type);
+        if (err < 0) {
+                dev_err(&client->dev, "Unexpected device\n");
+                return err;
+        }
         dev_dbg(&client->dev, "Asahi compass chip %s\n", name);
 
         /* Perform some basic start-of-day setup of the device. */
@@ -655,6 +813,8 @@ static int ak8975_probe(struct i2c_client *client,
 static const struct i2c_device_id ak8975_id[] = {
         {"ak8975", AK8975},
         {"ak8963", AK8963},
+        {"ak09911", AK09911},
+        {"ak09912", AK09912},
         {}
 };
 
@@ -665,6 +825,10 @@ static const struct of_device_id ak8975_of_match[] = {
         { .compatible = "ak8975", },
         { .compatible = "asahi-kasei,ak8963", },
         { .compatible = "ak8963", },
+        { .compatible = "asahi-kasei,ak09911", },
+        { .compatible = "ak09911", },
+        { .compatible = "asahi-kasei,ak09912", },
+        { .compatible = "ak09912", },
         {}
 };
 MODULE_DEVICE_TABLE(of, ak8975_of_match);