diff options
Diffstat (limited to 'drivers/iio/magnetometer/ak8975.c')
| -rw-r--r-- | drivers/iio/magnetometer/ak8975.c | 71 |
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, |