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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.c277
1 files changed, 174 insertions, 103 deletions
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 3c881541ae72..3fd0171e5d69 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -8,6 +8,7 @@
*/
#include <linux/module.h>
+#include <linux/mod_devicetable.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
@@ -17,7 +18,6 @@
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/gpio/consumer.h>
-#include <linux/acpi.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
@@ -78,6 +78,8 @@
*/
#define AK09912_REG_WIA1 0x00
#define AK09912_REG_WIA2 0x01
+#define AK09918_DEVICE_ID 0x0C
+#define AK09916_DEVICE_ID 0x09
#define AK09912_DEVICE_ID 0x04
#define AK09911_DEVICE_ID 0x05
@@ -203,11 +205,12 @@ static long ak09912_raw_to_gauss(u16 data)
/* Compatible Asahi Kasei Compass parts */
enum asahi_compass_chipset {
- AKXXXX = 0,
AK8975,
AK8963,
AK09911,
AK09912,
+ AK09916,
+ AK09918,
};
enum ak_ctrl_reg_addr {
@@ -246,7 +249,7 @@ struct ak_def {
};
static const struct ak_def ak_def_array[] = {
- {
+ [AK8975] = {
.type = AK8975,
.raw_to_gauss = ak8975_raw_to_gauss,
.range = 4096,
@@ -271,7 +274,7 @@ static const struct ak_def ak_def_array[] = {
AK8975_REG_HYL,
AK8975_REG_HZL},
},
- {
+ [AK8963] = {
.type = AK8963,
.raw_to_gauss = ak8963_09911_raw_to_gauss,
.range = 8190,
@@ -296,7 +299,7 @@ static const struct ak_def ak_def_array[] = {
AK8975_REG_HYL,
AK8975_REG_HZL},
},
- {
+ [AK09911] = {
.type = AK09911,
.raw_to_gauss = ak8963_09911_raw_to_gauss,
.range = 8192,
@@ -321,7 +324,7 @@ static const struct ak_def ak_def_array[] = {
AK09912_REG_HYL,
AK09912_REG_HZL},
},
- {
+ [AK09912] = {
.type = AK09912,
.raw_to_gauss = ak09912_raw_to_gauss,
.range = 32752,
@@ -345,6 +348,59 @@ static const struct ak_def ak_def_array[] = {
AK09912_REG_HXL,
AK09912_REG_HYL,
AK09912_REG_HZL},
+ },
+ [AK09916] = {
+ .type = AK09916,
+ .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},
+ },
+ [AK09918] = {
+ /* ak09918 is register compatible with ak09912 this is for avoid
+ * unknown id messages.
+ */
+ .type = AK09918,
+ .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},
}
};
@@ -358,6 +414,7 @@ struct ak8975_data {
u8 asa[3];
long raw_to_gauss[3];
struct gpio_desc *eoc_gpiod;
+ struct gpio_desc *reset_gpiod;
int eoc_irq;
wait_queue_head_t data_ready_queue;
unsigned long flags;
@@ -365,6 +422,12 @@ struct ak8975_data {
struct iio_mount_matrix orientation;
struct regulator *vdd;
struct regulator *vid;
+
+ /* Ensure natural alignment of timestamp */
+ struct {
+ s16 channels[3];
+ aligned_s64 ts;
+ } scan;
};
/* Enable attached power regulator if any. */
@@ -382,12 +445,16 @@ static int ak8975_power_on(const struct ak8975_data *data)
if (ret) {
dev_warn(&data->client->dev,
"Failed to enable specified Vid supply\n");
+ regulator_disable(data->vdd);
return ret;
}
+
+ gpiod_set_value_cansleep(data->reset_gpiod, 0);
+
/*
- * According to the datasheet the power supply rise time i 200us
+ * According to the datasheet the power supply rise time is 200us
* and the minimum wait time before mode setting is 100us, in
- * total 300 us. Add some margin and say minimum 500us here.
+ * total 300us. Add some margin and say minimum 500us here.
*/
usleep_range(500, 1000);
return 0;
@@ -396,6 +463,8 @@ static int ak8975_power_on(const struct ak8975_data *data)
/* Disable attached power regulator if any. */
static void ak8975_power_off(const struct ak8975_data *data)
{
+ gpiod_set_value_cansleep(data->reset_gpiod, 1);
+
regulator_disable(data->vid);
regulator_disable(data->vdd);
}
@@ -413,6 +482,8 @@ static int ak8975_who_i_am(struct i2c_client *client,
/*
* Signature for each device:
* Device | WIA1 | WIA2
+ * AK09918 | DEVICE_ID_| AK09918_DEVICE_ID
+ * AK09916 | DEVICE_ID_| AK09916_DEVICE_ID
* AK09912 | DEVICE_ID | AK09912_DEVICE_ID
* AK09911 | DEVICE_ID | AK09911_DEVICE_ID
* AK8975 | DEVICE_ID | NA
@@ -440,10 +511,22 @@ static int ak8975_who_i_am(struct i2c_client *client,
if (wia_val[1] == AK09912_DEVICE_ID)
return 0;
break;
- default:
- dev_err(&client->dev, "Type %d unknown\n", type);
+ case AK09916:
+ if (wia_val[1] == AK09916_DEVICE_ID)
+ return 0;
+ break;
+ case AK09918:
+ if (wia_val[1] == AK09918_DEVICE_ID)
+ return 0;
+ break;
}
- return -ENODEV;
+
+ dev_info(&client->dev, "Device ID %x is unknown.\n", wia_val[1]);
+ /*
+ * Let driver to probe on unknown id for support more register
+ * compatible variants.
+ */
+ return 0;
}
/*
@@ -648,22 +731,8 @@ static int ak8975_start_read_axis(struct ak8975_data *data,
if (ret < 0)
return ret;
- /* This will be executed only for non-interrupt based waiting case */
- if (ret & data->def->ctrl_masks[ST1_DRDY]) {
- ret = i2c_smbus_read_byte_data(client,
- data->def->ctrl_regs[ST2]);
- if (ret < 0) {
- dev_err(&client->dev, "Error in reading ST2\n");
- return ret;
- }
- if (ret & (data->def->ctrl_masks[ST2_DERR] |
- data->def->ctrl_masks[ST2_HOFL])) {
- dev_err(&client->dev, "ST2 status error 0x%x\n", ret);
- return -EINVAL;
- }
- }
-
- return 0;
+ /* Return with zero if the data is ready. */
+ return !data->def->ctrl_regs[ST1_DRDY];
}
/* Retrieve raw flux value for one of the x, y, or z axis. */
@@ -690,9 +759,22 @@ static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val)
if (ret < 0)
goto exit;
+ /* Read out ST2 for release lock on measurment data. */
+ ret = i2c_smbus_read_byte_data(client, data->def->ctrl_regs[ST2]);
+ if (ret < 0) {
+ dev_err(&client->dev, "Error in reading ST2\n");
+ goto exit;
+ }
+
+ if (ret & (data->def->ctrl_masks[ST2_DERR] |
+ data->def->ctrl_masks[ST2_HOFL])) {
+ dev_err(&client->dev, "ST2 status error 0x%x\n", ret);
+ ret = -EINVAL;
+ goto exit;
+ }
+
mutex_unlock(&data->lock);
- pm_runtime_mark_last_busy(&data->client->dev);
pm_runtime_put_autosuspend(&data->client->dev);
/* Swap bytes and convert to valid range. */
@@ -767,27 +849,12 @@ static const struct iio_info ak8975_info = {
.read_raw = &ak8975_read_raw,
};
-#ifdef CONFIG_ACPI
-static const struct acpi_device_id ak_acpi_match[] = {
- {"AK8975", AK8975},
- {"AK8963", AK8963},
- {"INVN6500", AK8963},
- {"AK009911", AK09911},
- {"AK09911", AK09911},
- {"AKM9911", AK09911},
- {"AK09912", AK09912},
- { }
-};
-MODULE_DEVICE_TABLE(acpi, ak_acpi_match);
-#endif
-
static void ak8975_fill_buffer(struct iio_dev *indio_dev)
{
struct ak8975_data *data = iio_priv(indio_dev);
const struct i2c_client *client = data->client;
const struct ak_def *def = data->def;
int ret;
- s16 buff[8]; /* 3 x 16 bits axis values + 1 aligned 64 bits timestamp */
__le16 fval[3];
mutex_lock(&data->lock);
@@ -810,12 +877,13 @@ static void ak8975_fill_buffer(struct iio_dev *indio_dev)
mutex_unlock(&data->lock);
/* Clamp to valid range. */
- buff[0] = clamp_t(s16, le16_to_cpu(fval[0]), -def->range, def->range);
- buff[1] = clamp_t(s16, le16_to_cpu(fval[1]), -def->range, def->range);
- buff[2] = clamp_t(s16, le16_to_cpu(fval[2]), -def->range, def->range);
+ data->scan.channels[0] = clamp_t(s16, le16_to_cpu(fval[0]), -def->range, def->range);
+ data->scan.channels[1] = clamp_t(s16, le16_to_cpu(fval[1]), -def->range, def->range);
+ data->scan.channels[2] = clamp_t(s16, le16_to_cpu(fval[2]), -def->range, def->range);
+
+ iio_push_to_buffers_with_ts(indio_dev, &data->scan, sizeof(data->scan),
+ iio_get_time_ns(indio_dev));
- iio_push_to_buffers_with_timestamp(indio_dev, buff,
- iio_get_time_ns(indio_dev));
return;
unlock:
@@ -833,16 +901,14 @@ static irqreturn_t ak8975_handle_trigger(int irq, void *p)
return IRQ_HANDLED;
}
-static int ak8975_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int ak8975_probe(struct i2c_client *client)
{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct ak8975_data *data;
struct iio_dev *indio_dev;
struct gpio_desc *eoc_gpiod;
- const void *match;
- unsigned int i;
+ struct gpio_desc *reset_gpiod;
int err;
- enum asahi_compass_chipset chipset;
const char *name = NULL;
/*
@@ -856,6 +922,16 @@ static int ak8975_probe(struct i2c_client *client,
if (eoc_gpiod)
gpiod_set_consumer_name(eoc_gpiod, "ak_8975");
+ /*
+ * According to AK09911 datasheet, if reset GPIO is provided then
+ * deassert reset on ak8975_power_on() and assert reset on
+ * ak8975_power_off().
+ */
+ reset_gpiod = devm_gpiod_get_optional(&client->dev,
+ "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(reset_gpiod))
+ return PTR_ERR(reset_gpiod);
+
/* Register with IIO */
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (indio_dev == NULL)
@@ -866,34 +942,23 @@ static int ak8975_probe(struct i2c_client *client,
data->client = client;
data->eoc_gpiod = eoc_gpiod;
+ data->reset_gpiod = reset_gpiod;
data->eoc_irq = 0;
- err = iio_read_mount_matrix(&client->dev, "mount-matrix", &data->orientation);
+ err = iio_read_mount_matrix(&client->dev, &data->orientation);
if (err)
return err;
/* id will be NULL when enumerated via ACPI */
- match = device_get_match_data(&client->dev);
- if (match) {
- chipset = (enum asahi_compass_chipset)(match);
- name = dev_name(&client->dev);
- } else if (id) {
- chipset = (enum asahi_compass_chipset)(id->driver_data);
- name = id->name;
- } else
- return -ENOSYS;
-
- for (i = 0; i < ARRAY_SIZE(ak_def_array); i++)
- if (ak_def_array[i].type == chipset)
- break;
-
- if (i == ARRAY_SIZE(ak_def_array)) {
- dev_err(&client->dev, "AKM device type unsupported: %d\n",
- chipset);
+ data->def = i2c_get_match_data(client);
+ if (!data->def)
return -ENODEV;
- }
- data->def = &ak_def_array[i];
+ /* If enumerated via firmware node, fix the ABI */
+ if (dev_fwnode(&client->dev))
+ name = dev_name(&client->dev);
+ else
+ name = id->name;
/* Fetch the regulators */
data->vdd = devm_regulator_get(&client->dev, "vdd");
@@ -922,7 +987,6 @@ static int ak8975_probe(struct i2c_client *client,
}
mutex_init(&data->lock);
- indio_dev->dev.parent = &client->dev;
indio_dev->channels = ak8975_channels;
indio_dev->num_channels = ARRAY_SIZE(ak8975_channels);
indio_dev->info = &ak8975_info;
@@ -964,7 +1028,7 @@ power_off:
return err;
}
-static int ak8975_remove(struct i2c_client *client)
+static void ak8975_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct ak8975_data *data = iio_priv(indio_dev);
@@ -976,11 +1040,8 @@ static int ak8975_remove(struct i2c_client *client)
iio_triggered_buffer_cleanup(indio_dev);
ak8975_set_mode(data, POWER_DOWN);
ak8975_power_off(data);
-
- return 0;
}
-#ifdef CONFIG_PM
static int ak8975_runtime_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
@@ -1021,45 +1082,55 @@ static int ak8975_runtime_resume(struct device *dev)
return 0;
}
-#endif /* CONFIG_PM */
-static const struct dev_pm_ops ak8975_dev_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
- pm_runtime_force_resume)
- SET_RUNTIME_PM_OPS(ak8975_runtime_suspend,
- ak8975_runtime_resume, NULL)
+static DEFINE_RUNTIME_DEV_PM_OPS(ak8975_dev_pm_ops, ak8975_runtime_suspend,
+ ak8975_runtime_resume, NULL);
+
+static const struct acpi_device_id ak_acpi_match[] = {
+ {"AK8963", (kernel_ulong_t)&ak_def_array[AK8963] },
+ {"AK8975", (kernel_ulong_t)&ak_def_array[AK8975] },
+ {"AK009911", (kernel_ulong_t)&ak_def_array[AK09911] },
+ {"AK09911", (kernel_ulong_t)&ak_def_array[AK09911] },
+ {"AK09912", (kernel_ulong_t)&ak_def_array[AK09912] },
+ {"AKM9911", (kernel_ulong_t)&ak_def_array[AK09911] },
+ {"INVN6500", (kernel_ulong_t)&ak_def_array[AK8963] },
+ { }
};
+MODULE_DEVICE_TABLE(acpi, ak_acpi_match);
static const struct i2c_device_id ak8975_id[] = {
- {"ak8975", AK8975},
- {"ak8963", AK8963},
- {"AK8963", AK8963},
- {"ak09911", AK09911},
- {"ak09912", AK09912},
- {}
+ {"AK8963", (kernel_ulong_t)&ak_def_array[AK8963] },
+ {"ak8963", (kernel_ulong_t)&ak_def_array[AK8963] },
+ {"ak8975", (kernel_ulong_t)&ak_def_array[AK8975] },
+ {"ak09911", (kernel_ulong_t)&ak_def_array[AK09911] },
+ {"ak09912", (kernel_ulong_t)&ak_def_array[AK09912] },
+ {"ak09916", (kernel_ulong_t)&ak_def_array[AK09916] },
+ {"ak09918", (kernel_ulong_t)&ak_def_array[AK09918] },
+ { }
};
-
MODULE_DEVICE_TABLE(i2c, ak8975_id);
static const struct of_device_id ak8975_of_match[] = {
- { .compatible = "asahi-kasei,ak8975", },
- { .compatible = "ak8975", },
- { .compatible = "asahi-kasei,ak8963", },
- { .compatible = "ak8963", },
- { .compatible = "asahi-kasei,ak09911", },
- { .compatible = "ak09911", },
- { .compatible = "asahi-kasei,ak09912", },
- { .compatible = "ak09912", },
- {}
+ { .compatible = "asahi-kasei,ak8975", .data = &ak_def_array[AK8975] },
+ { .compatible = "ak8975", .data = &ak_def_array[AK8975] },
+ { .compatible = "asahi-kasei,ak8963", .data = &ak_def_array[AK8963] },
+ { .compatible = "ak8963", .data = &ak_def_array[AK8963] },
+ { .compatible = "asahi-kasei,ak09911", .data = &ak_def_array[AK09911] },
+ { .compatible = "ak09911", .data = &ak_def_array[AK09911] },
+ { .compatible = "asahi-kasei,ak09912", .data = &ak_def_array[AK09912] },
+ { .compatible = "ak09912", .data = &ak_def_array[AK09912] },
+ { .compatible = "asahi-kasei,ak09916", .data = &ak_def_array[AK09916] },
+ { .compatible = "asahi-kasei,ak09918", .data = &ak_def_array[AK09918] },
+ { }
};
MODULE_DEVICE_TABLE(of, ak8975_of_match);
static struct i2c_driver ak8975_driver = {
.driver = {
.name = "ak8975",
- .pm = &ak8975_dev_pm_ops,
- .of_match_table = of_match_ptr(ak8975_of_match),
- .acpi_match_table = ACPI_PTR(ak_acpi_match),
+ .pm = pm_ptr(&ak8975_dev_pm_ops),
+ .of_match_table = ak8975_of_match,
+ .acpi_match_table = ak_acpi_match,
},
.probe = ak8975_probe,
.remove = ak8975_remove,
generated by cgit (git 2.34.1) at 2025-12-27 15:36:39 +0000