diff options
Diffstat (limited to 'drivers/iio/magnetometer')
-rw-r--r-- | drivers/iio/magnetometer/Kconfig | 10 | ||||
-rw-r--r-- | drivers/iio/magnetometer/Makefile | 1 | ||||
-rw-r--r-- | drivers/iio/magnetometer/ak8975.c | 2 | ||||
-rw-r--r-- | drivers/iio/magnetometer/hid-sensor-magn-3d.c | 7 | ||||
-rw-r--r-- | drivers/iio/magnetometer/mag3110.c | 401 | ||||
-rw-r--r-- | drivers/iio/magnetometer/st_magn_buffer.c | 11 | ||||
-rw-r--r-- | drivers/iio/magnetometer/st_magn_core.c | 49 |
7 files changed, 443 insertions, 38 deletions
diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig index 4fa923f37b9..0cf09637b35 100644 --- a/drivers/iio/magnetometer/Kconfig +++ b/drivers/iio/magnetometer/Kconfig @@ -16,6 +16,16 @@ config AK8975 To compile this driver as a module, choose M here: the module will be called ak8975. +config MAG3110 + tristate "Freescale MAG3110 3-Axis Magnetometer" + depends on I2C + help + Say yes here to build support for the Freescale MAG3110 3-Axis + magnetometer. + + To compile this driver as a module, choose M here: the module + will be called mag3110. + config HID_SENSOR_MAGNETOMETER_3D depends on HID_SENSOR_HUB select IIO_BUFFER diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/Makefile index f91b1b68d39..0f5d3c98579 100644 --- a/drivers/iio/magnetometer/Makefile +++ b/drivers/iio/magnetometer/Makefile @@ -4,6 +4,7 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_AK8975) += ak8975.o +obj-$(CONFIG_MAG3110) += mag3110.o obj-$(CONFIG_HID_SENSOR_MAGNETOMETER_3D) += hid-sensor-magn-3d.o obj-$(CONFIG_IIO_ST_MAGN_3AXIS) += st_magn.o diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index 7105f22d6cd..ff284e5afd9 100644 --- a/drivers/iio/magnetometer/ak8975.c +++ b/drivers/iio/magnetometer/ak8975.c @@ -263,7 +263,7 @@ static int ak8975_setup(struct i2c_client *client) * * HuT = H * 1229/4096, or roughly, 3/10. * - * Since 1uT = 100 gauss, our final scale factor becomes: + * Since 1uT = 0.01 gauss, our final scale factor becomes: * * Hadj = H * ((ASA + 128) / 256) * 3/10 * 100 * Hadj = H * ((ASA + 128) * 30 / 256 diff --git a/drivers/iio/magnetometer/hid-sensor-magn-3d.c b/drivers/iio/magnetometer/hid-sensor-magn-3d.c index a98460b15e4..2634920562f 100644 --- a/drivers/iio/magnetometer/hid-sensor-magn-3d.c +++ b/drivers/iio/magnetometer/hid-sensor-magn-3d.c @@ -183,10 +183,11 @@ static const struct iio_info magn_3d_info = { }; /* Function to push data to buffer */ -static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) +static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, + int len) { dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); - iio_push_to_buffers(indio_dev, (u8 *)data); + iio_push_to_buffers(indio_dev, data); } /* Callback handler to send event after all samples are received and captured */ @@ -201,7 +202,7 @@ static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev, magn_state->common_attributes.data_ready); if (magn_state->common_attributes.data_ready) hid_sensor_push_data(indio_dev, - (u8 *)magn_state->magn_val, + magn_state->magn_val, sizeof(magn_state->magn_val)); return 0; diff --git a/drivers/iio/magnetometer/mag3110.c b/drivers/iio/magnetometer/mag3110.c new file mode 100644 index 00000000000..783c5b41735 --- /dev/null +++ b/drivers/iio/magnetometer/mag3110.c @@ -0,0 +1,401 @@ +/* + * mag3110.c - Support for Freescale MAG3110 magnetometer sensor + * + * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net> + * + * This file is subject to the terms and conditions of version 2 of + * the GNU General Public License. See the file COPYING in the main + * directory of this archive for more details. + * + * (7-bit I2C slave address 0x0e) + * + * TODO: irq, user offset, oversampling, continuous mode + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/buffer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/delay.h> + +#define MAG3110_STATUS 0x00 +#define MAG3110_OUT_X 0x01 /* MSB first */ +#define MAG3110_OUT_Y 0x03 +#define MAG3110_OUT_Z 0x05 +#define MAG3110_WHO_AM_I 0x07 +#define MAG3110_OFF_X 0x09 /* MSB first */ +#define MAG3110_OFF_Y 0x0b +#define MAG3110_OFF_Z 0x0d +#define MAG3110_DIE_TEMP 0x0f +#define MAG3110_CTRL_REG1 0x10 +#define MAG3110_CTRL_REG2 0x11 + +#define MAG3110_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) + +#define MAG3110_CTRL_DR_MASK (BIT(7) | BIT(6) | BIT(5)) +#define MAG3110_CTRL_DR_SHIFT 5 +#define MAG3110_CTRL_DR_DEFAULT 0 + +#define MAG3110_CTRL_TM BIT(1) /* trigger single measurement */ +#define MAG3110_CTRL_AC BIT(0) /* continuous measurements */ + +#define MAG3110_CTRL_AUTO_MRST_EN BIT(7) /* magnetic auto-reset */ +#define MAG3110_CTRL_RAW BIT(5) /* measurements not user-offset corrected */ + +#define MAG3110_DEVICE_ID 0xc4 + +/* Each client has this additional data */ +struct mag3110_data { + struct i2c_client *client; + struct mutex lock; + u8 ctrl_reg1; +}; + +static int mag3110_request(struct mag3110_data *data) +{ + int ret, tries = 150; + + /* trigger measurement */ + ret = i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1, + data->ctrl_reg1 | MAG3110_CTRL_TM); + if (ret < 0) + return ret; + + while (tries-- > 0) { + ret = i2c_smbus_read_byte_data(data->client, MAG3110_STATUS); + if (ret < 0) + return ret; + /* wait for data ready */ + if ((ret & MAG3110_STATUS_DRDY) == MAG3110_STATUS_DRDY) + break; + msleep(20); + } + + if (tries < 0) { + dev_err(&data->client->dev, "data not ready\n"); + return -EIO; + } + + return 0; +} + +static int mag3110_read(struct mag3110_data *data, __be16 buf[3]) +{ + int ret; + + mutex_lock(&data->lock); + ret = mag3110_request(data); + if (ret < 0) { + mutex_unlock(&data->lock); + return ret; + } + ret = i2c_smbus_read_i2c_block_data(data->client, + MAG3110_OUT_X, 3 * sizeof(__be16), (u8 *) buf); + mutex_unlock(&data->lock); + + return ret; +} + +static ssize_t mag3110_show_int_plus_micros(char *buf, + const int (*vals)[2], int n) +{ + size_t len = 0; + + while (n-- > 0) + len += scnprintf(buf + len, PAGE_SIZE - len, + "%d.%d ", vals[n][0], vals[n][1]); + + /* replace trailing space by newline */ + buf[len - 1] = '\n'; + + return len; +} + +static int mag3110_get_int_plus_micros_index(const int (*vals)[2], int n, + int val, int val2) +{ + while (n-- > 0) + if (val == vals[n][0] && val2 == vals[n][1]) + return n; + + return -EINVAL; +} + +static const int mag3110_samp_freq[8][2] = { + {80, 0}, {40, 0}, {20, 0}, {10, 0}, {5, 0}, {2, 500000}, + {1, 250000}, {0, 625000} +}; + +static ssize_t mag3110_show_samp_freq_avail(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return mag3110_show_int_plus_micros(buf, mag3110_samp_freq, 8); +} + +static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mag3110_show_samp_freq_avail); + +static int mag3110_get_samp_freq_index(struct mag3110_data *data, + int val, int val2) +{ + return mag3110_get_int_plus_micros_index(mag3110_samp_freq, 8, val, + val2); +} + +static int mag3110_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct mag3110_data *data = iio_priv(indio_dev); + __be16 buffer[3]; + int i, ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_MAGN: /* in 0.1 uT / LSB */ + ret = mag3110_read(data, buffer); + if (ret < 0) + return ret; + *val = sign_extend32( + be16_to_cpu(buffer[chan->scan_index]), 15); + return IIO_VAL_INT; + case IIO_TEMP: /* in 1 C / LSB */ + mutex_lock(&data->lock); + ret = mag3110_request(data); + if (ret < 0) { + mutex_unlock(&data->lock); + return ret; + } + ret = i2c_smbus_read_byte_data(data->client, + MAG3110_DIE_TEMP); + mutex_unlock(&data->lock); + if (ret < 0) + return ret; + *val = sign_extend32(ret, 7); + return IIO_VAL_INT; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_SCALE: + *val = 0; + *val2 = 1000; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_SAMP_FREQ: + i = data->ctrl_reg1 >> MAG3110_CTRL_DR_SHIFT; + *val = mag3110_samp_freq[i][0]; + *val2 = mag3110_samp_freq[i][1]; + return IIO_VAL_INT_PLUS_MICRO; + } + return -EINVAL; +} + +static int mag3110_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct mag3110_data *data = iio_priv(indio_dev); + int rate; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + rate = mag3110_get_samp_freq_index(data, val, val2); + if (rate < 0) + return -EINVAL; + + data->ctrl_reg1 &= ~MAG3110_CTRL_DR_MASK; + data->ctrl_reg1 |= rate << MAG3110_CTRL_DR_SHIFT; + return i2c_smbus_write_byte_data(data->client, + MAG3110_CTRL_REG1, data->ctrl_reg1); + default: + return -EINVAL; + } +} + +static irqreturn_t mag3110_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct mag3110_data *data = iio_priv(indio_dev); + u8 buffer[16]; /* 3 16-bit channels + 1 byte temp + padding + ts */ + int ret; + + ret = mag3110_read(data, (__be16 *) buffer); + if (ret < 0) + goto done; + + if (test_bit(3, indio_dev->active_scan_mask)) { + ret = i2c_smbus_read_byte_data(data->client, + MAG3110_DIE_TEMP); + if (ret < 0) + goto done; + buffer[6] = ret; + } + + iio_push_to_buffers_with_timestamp(indio_dev, buffer, + iio_get_time_ns()); + +done: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + +#define MAG3110_CHANNEL(axis, idx) { \ + .type = IIO_MAGN, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .scan_index = idx, \ + .scan_type = IIO_ST('s', 16, 16, IIO_BE), \ +} + +static const struct iio_chan_spec mag3110_channels[] = { + MAG3110_CHANNEL(X, 0), + MAG3110_CHANNEL(Y, 1), + MAG3110_CHANNEL(Z, 2), + { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .scan_index = 3, + .scan_type = IIO_ST('s', 8, 8, 0), + }, + IIO_CHAN_SOFT_TIMESTAMP(4), +}; + +static struct attribute *mag3110_attributes[] = { + &iio_dev_attr_sampling_frequency_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group mag3110_group = { + .attrs = mag3110_attributes, +}; + +static const struct iio_info mag3110_info = { + .attrs = &mag3110_group, + .read_raw = &mag3110_read_raw, + .write_raw = &mag3110_write_raw, + .driver_module = THIS_MODULE, +}; + +static const unsigned long mag3110_scan_masks[] = {0x7, 0xf, 0}; + +static int mag3110_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct mag3110_data *data; + struct iio_dev *indio_dev; + int ret; + + ret = i2c_smbus_read_byte_data(client, MAG3110_WHO_AM_I); + if (ret < 0) + return ret; + if (ret != MAG3110_DEVICE_ID) + return -ENODEV; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + data->client = client; + mutex_init(&data->lock); + + i2c_set_clientdata(client, indio_dev); + indio_dev->info = &mag3110_info; + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = mag3110_channels; + indio_dev->num_channels = ARRAY_SIZE(mag3110_channels); + indio_dev->available_scan_masks = mag3110_scan_masks; + + data->ctrl_reg1 = MAG3110_CTRL_DR_DEFAULT; + ret = i2c_smbus_write_byte_data(client, MAG3110_CTRL_REG1, + data->ctrl_reg1); + if (ret < 0) + return ret; + + ret = i2c_smbus_write_byte_data(client, MAG3110_CTRL_REG2, + MAG3110_CTRL_AUTO_MRST_EN | MAG3110_CTRL_RAW); + if (ret < 0) + return ret; + + ret = iio_triggered_buffer_setup(indio_dev, NULL, + mag3110_trigger_handler, NULL); + if (ret < 0) + return ret; + + ret = iio_device_register(indio_dev); + if (ret < 0) + goto buffer_cleanup; + return 0; + +buffer_cleanup: + iio_triggered_buffer_cleanup(indio_dev); + return ret; +} + +static int mag3110_standby(struct mag3110_data *data) +{ + return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1, + data->ctrl_reg1 & ~MAG3110_CTRL_AC); +} + +static int mag3110_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); + mag3110_standby(iio_priv(indio_dev)); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mag3110_suspend(struct device *dev) +{ + return mag3110_standby(iio_priv(i2c_get_clientdata( + to_i2c_client(dev)))); +} + +static int mag3110_resume(struct device *dev) +{ + struct mag3110_data *data = iio_priv(i2c_get_clientdata( + to_i2c_client(dev))); + + return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1, + data->ctrl_reg1); +} + +static SIMPLE_DEV_PM_OPS(mag3110_pm_ops, mag3110_suspend, mag3110_resume); +#define MAG3110_PM_OPS (&mag3110_pm_ops) +#else +#define MAG3110_PM_OPS NULL +#endif + +static const struct i2c_device_id mag3110_id[] = { + { "mag3110", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, mag3110_id); + +static struct i2c_driver mag3110_driver = { + .driver = { + .name = "mag3110", + .pm = MAG3110_PM_OPS, + }, + .probe = mag3110_probe, + .remove = mag3110_remove, + .id_table = mag3110_id, +}; +module_i2c_driver(mag3110_driver); + +MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); +MODULE_DESCRIPTION("Freescale MAG3110 magnetometer driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/iio/magnetometer/st_magn_buffer.c b/drivers/iio/magnetometer/st_magn_buffer.c index 708857bdb47..bf427dc0d22 100644 --- a/drivers/iio/magnetometer/st_magn_buffer.c +++ b/drivers/iio/magnetometer/st_magn_buffer.c @@ -25,16 +25,7 @@ static int st_magn_buffer_preenable(struct iio_dev *indio_dev) { - int err; - - err = st_sensors_set_enable(indio_dev, true); - if (err < 0) - goto st_magn_set_enable_error; - - err = iio_sw_buffer_preenable(indio_dev); - -st_magn_set_enable_error: - return err; + return st_sensors_set_enable(indio_dev, true); } static int st_magn_buffer_postenable(struct iio_dev *indio_dev) diff --git a/drivers/iio/magnetometer/st_magn_core.c b/drivers/iio/magnetometer/st_magn_core.c index e8d2849cc81..52bbcfa1e07 100644 --- a/drivers/iio/magnetometer/st_magn_core.c +++ b/drivers/iio/magnetometer/st_magn_core.c @@ -29,9 +29,9 @@ #define ST_MAGN_NUMBER_DATA_CHANNELS 3 /* DEFAULT VALUE FOR SENSORS */ -#define ST_MAGN_DEFAULT_OUT_X_L_ADDR 0X04 -#define ST_MAGN_DEFAULT_OUT_Y_L_ADDR 0X08 -#define ST_MAGN_DEFAULT_OUT_Z_L_ADDR 0X06 +#define ST_MAGN_DEFAULT_OUT_X_H_ADDR 0X03 +#define ST_MAGN_DEFAULT_OUT_Y_H_ADDR 0X07 +#define ST_MAGN_DEFAULT_OUT_Z_H_ADDR 0X05 /* FULLSCALE */ #define ST_MAGN_FS_AVL_1300MG 1300 @@ -117,16 +117,16 @@ static const struct iio_chan_spec st_magn_16bit_channels[] = { ST_SENSORS_LSM_CHANNELS(IIO_MAGN, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), - ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16, - ST_MAGN_DEFAULT_OUT_X_L_ADDR), + ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_BE, 16, 16, + ST_MAGN_DEFAULT_OUT_X_H_ADDR), ST_SENSORS_LSM_CHANNELS(IIO_MAGN, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), - ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16, - ST_MAGN_DEFAULT_OUT_Y_L_ADDR), + ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_BE, 16, 16, + ST_MAGN_DEFAULT_OUT_Y_H_ADDR), ST_SENSORS_LSM_CHANNELS(IIO_MAGN, BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), - ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16, - ST_MAGN_DEFAULT_OUT_Z_L_ADDR), + ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_BE, 16, 16, + ST_MAGN_DEFAULT_OUT_Z_H_ADDR), IIO_CHAN_SOFT_TIMESTAMP(3) }; @@ -348,8 +348,9 @@ static const struct iio_info magn_info = { int st_magn_common_probe(struct iio_dev *indio_dev, struct st_sensors_platform_data *pdata) { - int err; struct st_sensor_data *mdata = iio_priv(indio_dev); + int irq = mdata->get_irq_data_ready(indio_dev); + int err; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &magn_info; @@ -357,7 +358,7 @@ int st_magn_common_probe(struct iio_dev *indio_dev, err = st_sensors_check_device_support(indio_dev, ARRAY_SIZE(st_magn_sensors), st_magn_sensors); if (err < 0) - goto st_magn_common_probe_error; + return err; mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS; mdata->multiread_bit = mdata->sensor->multi_read_bit; @@ -370,12 +371,13 @@ int st_magn_common_probe(struct iio_dev *indio_dev, err = st_sensors_init_sensor(indio_dev, pdata); if (err < 0) - goto st_magn_common_probe_error; + return err; - if (mdata->get_irq_data_ready(indio_dev) > 0) { - err = st_magn_allocate_ring(indio_dev); - if (err < 0) - goto st_magn_common_probe_error; + err = st_magn_allocate_ring(indio_dev); + if (err < 0) + return err; + + if (irq > 0) { err = st_sensors_allocate_trigger(indio_dev, NULL); if (err < 0) goto st_magn_probe_trigger_error; @@ -385,15 +387,14 @@ int st_magn_common_probe(struct iio_dev *indio_dev, if (err) goto st_magn_device_register_error; - return err; + return 0; st_magn_device_register_error: - if (mdata->get_irq_data_ready(indio_dev) > 0) + if (irq > 0) st_sensors_deallocate_trigger(indio_dev); st_magn_probe_trigger_error: - if (mdata->get_irq_data_ready(indio_dev) > 0) - st_magn_deallocate_ring(indio_dev); -st_magn_common_probe_error: + st_magn_deallocate_ring(indio_dev); + return err; } EXPORT_SYMBOL(st_magn_common_probe); @@ -403,10 +404,10 @@ void st_magn_common_remove(struct iio_dev *indio_dev) struct st_sensor_data *mdata = iio_priv(indio_dev); iio_device_unregister(indio_dev); - if (mdata->get_irq_data_ready(indio_dev) > 0) { + if (mdata->get_irq_data_ready(indio_dev) > 0) st_sensors_deallocate_trigger(indio_dev); - st_magn_deallocate_ring(indio_dev); - } + + st_magn_deallocate_ring(indio_dev); } EXPORT_SYMBOL(st_magn_common_remove); |