summaryrefslogtreecommitdiff
path: root/drivers/misc/bmp085.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/misc/bmp085.c
Initial import
Diffstat (limited to 'drivers/misc/bmp085.c')
-rw-r--r--drivers/misc/bmp085.c506
1 files changed, 506 insertions, 0 deletions
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
new file mode 100644
index 000000000..9b313f781
--- /dev/null
+++ b/drivers/misc/bmp085.c
@@ -0,0 +1,506 @@
+/* Copyright (c) 2010 Christoph Mair <christoph.mair@gmail.com>
+ * Copyright (c) 2012 Bosch Sensortec GmbH
+ * Copyright (c) 2012 Unixphere AB
+ *
+ * This driver supports the bmp085 and bmp18x digital barometric pressure
+ * and temperature sensors from Bosch Sensortec. The datasheets
+ * are available from their website:
+ * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP085-DS000-05.pdf
+ * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP180-DS000-07.pdf
+ *
+ * A pressure measurement is issued by reading from pressure0_input.
+ * The return value ranges from 30000 to 110000 pascal with a resulution
+ * of 1 pascal (0.01 millibar) which enables measurements from 9000m above
+ * to 500m below sea level.
+ *
+ * The temperature can be read from temp0_input. Values range from
+ * -400 to 850 representing the ambient temperature in degree celsius
+ * multiplied by 10.The resolution is 0.1 celsius.
+ *
+ * Because ambient pressure is temperature dependent, a temperature
+ * measurement will be executed automatically even if the user is reading
+ * from pressure0_input. This happens if the last temperature measurement
+ * has been executed more then one second ago.
+ *
+ * To decrease RMS noise from pressure measurements, the bmp085 can
+ * autonomously calculate the average of up to eight samples. This is
+ * set up by writing to the oversampling sysfs file. Accepted values
+ * are 0, 1, 2 and 3. 2^x when x is the value written to this file
+ * specifies the number of samples used to calculate the ambient pressure.
+ * RMS noise is specified with six pascal (without averaging) and decreases
+ * down to 3 pascal when using an oversampling setting of 3.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include "bmp085.h"
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/gpio.h>
+
+#define BMP085_CHIP_ID 0x55
+#define BMP085_CALIBRATION_DATA_START 0xAA
+#define BMP085_CALIBRATION_DATA_LENGTH 11 /* 16 bit values */
+#define BMP085_CHIP_ID_REG 0xD0
+#define BMP085_CTRL_REG 0xF4
+#define BMP085_TEMP_MEASUREMENT 0x2E
+#define BMP085_PRESSURE_MEASUREMENT 0x34
+#define BMP085_CONVERSION_REGISTER_MSB 0xF6
+#define BMP085_CONVERSION_REGISTER_LSB 0xF7
+#define BMP085_CONVERSION_REGISTER_XLSB 0xF8
+#define BMP085_TEMP_CONVERSION_TIME 5
+
+struct bmp085_calibration_data {
+ s16 AC1, AC2, AC3;
+ u16 AC4, AC5, AC6;
+ s16 B1, B2;
+ s16 MB, MC, MD;
+};
+
+struct bmp085_data {
+ struct device *dev;
+ struct regmap *regmap;
+ struct mutex lock;
+ struct bmp085_calibration_data calibration;
+ u8 oversampling_setting;
+ u32 raw_temperature;
+ u32 raw_pressure;
+ u32 temp_measurement_period;
+ unsigned long last_temp_measurement;
+ u8 chip_id;
+ s32 b6; /* calculated temperature correction coefficient */
+ int irq;
+ struct completion done;
+};
+
+static irqreturn_t bmp085_eoc_isr(int irq, void *devid)
+{
+ struct bmp085_data *data = devid;
+
+ complete(&data->done);
+
+ return IRQ_HANDLED;
+}
+
+static s32 bmp085_read_calibration_data(struct bmp085_data *data)
+{
+ u16 tmp[BMP085_CALIBRATION_DATA_LENGTH];
+ struct bmp085_calibration_data *cali = &(data->calibration);
+ s32 status = regmap_bulk_read(data->regmap,
+ BMP085_CALIBRATION_DATA_START, (u8 *)tmp,
+ (BMP085_CALIBRATION_DATA_LENGTH << 1));
+ if (status < 0)
+ return status;
+
+ cali->AC1 = be16_to_cpu(tmp[0]);
+ cali->AC2 = be16_to_cpu(tmp[1]);
+ cali->AC3 = be16_to_cpu(tmp[2]);
+ cali->AC4 = be16_to_cpu(tmp[3]);
+ cali->AC5 = be16_to_cpu(tmp[4]);
+ cali->AC6 = be16_to_cpu(tmp[5]);
+ cali->B1 = be16_to_cpu(tmp[6]);
+ cali->B2 = be16_to_cpu(tmp[7]);
+ cali->MB = be16_to_cpu(tmp[8]);
+ cali->MC = be16_to_cpu(tmp[9]);
+ cali->MD = be16_to_cpu(tmp[10]);
+ return 0;
+}
+
+static s32 bmp085_update_raw_temperature(struct bmp085_data *data)
+{
+ u16 tmp;
+ s32 status;
+
+ mutex_lock(&data->lock);
+
+ init_completion(&data->done);
+
+ status = regmap_write(data->regmap, BMP085_CTRL_REG,
+ BMP085_TEMP_MEASUREMENT);
+ if (status < 0) {
+ dev_err(data->dev,
+ "Error while requesting temperature measurement.\n");
+ goto exit;
+ }
+ wait_for_completion_timeout(&data->done, 1 + msecs_to_jiffies(
+ BMP085_TEMP_CONVERSION_TIME));
+
+ status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB,
+ &tmp, sizeof(tmp));
+ if (status < 0) {
+ dev_err(data->dev,
+ "Error while reading temperature measurement result\n");
+ goto exit;
+ }
+ data->raw_temperature = be16_to_cpu(tmp);
+ data->last_temp_measurement = jiffies;
+ status = 0; /* everything ok, return 0 */
+
+exit:
+ mutex_unlock(&data->lock);
+ return status;
+}
+
+static s32 bmp085_update_raw_pressure(struct bmp085_data *data)
+{
+ u32 tmp = 0;
+ s32 status;
+
+ mutex_lock(&data->lock);
+
+ init_completion(&data->done);
+
+ status = regmap_write(data->regmap, BMP085_CTRL_REG,
+ BMP085_PRESSURE_MEASUREMENT +
+ (data->oversampling_setting << 6));
+ if (status < 0) {
+ dev_err(data->dev,
+ "Error while requesting pressure measurement.\n");
+ goto exit;
+ }
+
+ /* wait for the end of conversion */
+ wait_for_completion_timeout(&data->done, 1 + msecs_to_jiffies(
+ 2+(3 << data->oversampling_setting)));
+ /* copy data into a u32 (4 bytes), but skip the first byte. */
+ status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB,
+ ((u8 *)&tmp)+1, 3);
+ if (status < 0) {
+ dev_err(data->dev,
+ "Error while reading pressure measurement results\n");
+ goto exit;
+ }
+ data->raw_pressure = be32_to_cpu((tmp));
+ data->raw_pressure >>= (8-data->oversampling_setting);
+ status = 0; /* everything ok, return 0 */
+
+exit:
+ mutex_unlock(&data->lock);
+ return status;
+}
+
+/*
+ * This function starts the temperature measurement and returns the value
+ * in tenth of a degree celsius.
+ */
+static s32 bmp085_get_temperature(struct bmp085_data *data, int *temperature)
+{
+ struct bmp085_calibration_data *cali = &data->calibration;
+ long x1, x2;
+ int status;
+
+ status = bmp085_update_raw_temperature(data);
+ if (status < 0)
+ goto exit;
+
+ x1 = ((data->raw_temperature - cali->AC6) * cali->AC5) >> 15;
+ x2 = (cali->MC << 11) / (x1 + cali->MD);
+ data->b6 = x1 + x2 - 4000;
+ /* if NULL just update b6. Used for pressure only measurements */
+ if (temperature != NULL)
+ *temperature = (x1+x2+8) >> 4;
+
+exit:
+ return status;
+}
+
+/*
+ * This function starts the pressure measurement and returns the value
+ * in millibar. Since the pressure depends on the ambient temperature,
+ * a temperature measurement is executed according to the given temperature
+ * measurement period (default is 1 sec boundary). This period could vary
+ * and needs to be adjusted according to the sensor environment, i.e. if big
+ * temperature variations then the temperature needs to be read out often.
+ */
+static s32 bmp085_get_pressure(struct bmp085_data *data, int *pressure)
+{
+ struct bmp085_calibration_data *cali = &data->calibration;
+ s32 x1, x2, x3, b3;
+ u32 b4, b7;
+ s32 p;
+ int status;
+
+ /* alt least every second force an update of the ambient temperature */
+ if ((data->last_temp_measurement == 0) ||
+ time_is_before_jiffies(data->last_temp_measurement + 1*HZ)) {
+ status = bmp085_get_temperature(data, NULL);
+ if (status < 0)
+ return status;
+ }
+
+ status = bmp085_update_raw_pressure(data);
+ if (status < 0)
+ return status;
+
+ x1 = (data->b6 * data->b6) >> 12;
+ x1 *= cali->B2;
+ x1 >>= 11;
+
+ x2 = cali->AC2 * data->b6;
+ x2 >>= 11;
+
+ x3 = x1 + x2;
+
+ b3 = (((((s32)cali->AC1) * 4 + x3) << data->oversampling_setting) + 2);
+ b3 >>= 2;
+
+ x1 = (cali->AC3 * data->b6) >> 13;
+ x2 = (cali->B1 * ((data->b6 * data->b6) >> 12)) >> 16;
+ x3 = (x1 + x2 + 2) >> 2;
+ b4 = (cali->AC4 * (u32)(x3 + 32768)) >> 15;
+
+ b7 = ((u32)data->raw_pressure - b3) *
+ (50000 >> data->oversampling_setting);
+ p = ((b7 < 0x80000000) ? ((b7 << 1) / b4) : ((b7 / b4) * 2));
+
+ x1 = p >> 8;
+ x1 *= x1;
+ x1 = (x1 * 3038) >> 16;
+ x2 = (-7357 * p) >> 16;
+ p += (x1 + x2 + 3791) >> 4;
+
+ *pressure = p;
+
+ return 0;
+}
+
+/*
+ * This function sets the chip-internal oversampling. Valid values are 0..3.
+ * The chip will use 2^oversampling samples for internal averaging.
+ * This influences the measurement time and the accuracy; larger values
+ * increase both. The datasheet gives an overview on how measurement time,
+ * accuracy and noise correlate.
+ */
+static void bmp085_set_oversampling(struct bmp085_data *data,
+ unsigned char oversampling)
+{
+ if (oversampling > 3)
+ oversampling = 3;
+ data->oversampling_setting = oversampling;
+}
+
+/*
+ * Returns the currently selected oversampling. Range: 0..3
+ */
+static unsigned char bmp085_get_oversampling(struct bmp085_data *data)
+{
+ return data->oversampling_setting;
+}
+
+/* sysfs callbacks */
+static ssize_t set_oversampling(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct bmp085_data *data = dev_get_drvdata(dev);
+ unsigned long oversampling;
+ int err = kstrtoul(buf, 10, &oversampling);
+
+ if (err == 0) {
+ mutex_lock(&data->lock);
+ bmp085_set_oversampling(data, oversampling);
+ mutex_unlock(&data->lock);
+ return count;
+ }
+
+ return err;
+}
+
+static ssize_t show_oversampling(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct bmp085_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", bmp085_get_oversampling(data));
+}
+static DEVICE_ATTR(oversampling, S_IWUSR | S_IRUGO,
+ show_oversampling, set_oversampling);
+
+
+static ssize_t show_temperature(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int temperature;
+ int status;
+ struct bmp085_data *data = dev_get_drvdata(dev);
+
+ status = bmp085_get_temperature(data, &temperature);
+ if (status < 0)
+ return status;
+ else
+ return sprintf(buf, "%d\n", temperature);
+}
+static DEVICE_ATTR(temp0_input, S_IRUGO, show_temperature, NULL);
+
+
+static ssize_t show_pressure(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int pressure;
+ int status;
+ struct bmp085_data *data = dev_get_drvdata(dev);
+
+ status = bmp085_get_pressure(data, &pressure);
+ if (status < 0)
+ return status;
+ else
+ return sprintf(buf, "%d\n", pressure);
+}
+static DEVICE_ATTR(pressure0_input, S_IRUGO, show_pressure, NULL);
+
+
+static struct attribute *bmp085_attributes[] = {
+ &dev_attr_temp0_input.attr,
+ &dev_attr_pressure0_input.attr,
+ &dev_attr_oversampling.attr,
+ NULL
+};
+
+static const struct attribute_group bmp085_attr_group = {
+ .attrs = bmp085_attributes,
+};
+
+int bmp085_detect(struct device *dev)
+{
+ struct bmp085_data *data = dev_get_drvdata(dev);
+ unsigned int id;
+ int ret;
+
+ ret = regmap_read(data->regmap, BMP085_CHIP_ID_REG, &id);
+ if (ret < 0)
+ return ret;
+
+ if (id != data->chip_id)
+ return -ENODEV;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(bmp085_detect);
+
+static void bmp085_get_of_properties(struct bmp085_data *data)
+{
+#ifdef CONFIG_OF
+ struct device_node *np = data->dev->of_node;
+ u32 prop;
+
+ if (!np)
+ return;
+
+ if (!of_property_read_u32(np, "chip-id", &prop))
+ data->chip_id = prop & 0xff;
+
+ if (!of_property_read_u32(np, "temp-measurement-period", &prop))
+ data->temp_measurement_period = (prop/100)*HZ;
+
+ if (!of_property_read_u32(np, "default-oversampling", &prop))
+ data->oversampling_setting = prop & 0xff;
+#endif
+}
+
+static int bmp085_init_client(struct bmp085_data *data)
+{
+ int status = bmp085_read_calibration_data(data);
+
+ if (status < 0)
+ return status;
+
+ /* default settings */
+ data->chip_id = BMP085_CHIP_ID;
+ data->last_temp_measurement = 0;
+ data->temp_measurement_period = 1*HZ;
+ data->oversampling_setting = 3;
+
+ bmp085_get_of_properties(data);
+
+ mutex_init(&data->lock);
+
+ return 0;
+}
+
+struct regmap_config bmp085_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8
+};
+EXPORT_SYMBOL_GPL(bmp085_regmap_config);
+
+int bmp085_probe(struct device *dev, struct regmap *regmap, int irq)
+{
+ struct bmp085_data *data;
+ int err = 0;
+
+ data = kzalloc(sizeof(struct bmp085_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ dev_set_drvdata(dev, data);
+ data->dev = dev;
+ data->regmap = regmap;
+ data->irq = irq;
+
+ if (data->irq > 0) {
+ err = devm_request_irq(dev, data->irq, bmp085_eoc_isr,
+ IRQF_TRIGGER_RISING, "bmp085",
+ data);
+ if (err < 0)
+ goto exit_free;
+ }
+
+ /* Initialize the BMP085 chip */
+ err = bmp085_init_client(data);
+ if (err < 0)
+ goto exit_free;
+
+ err = bmp085_detect(dev);
+ if (err < 0) {
+ dev_err(dev, "%s: chip_id failed!\n", BMP085_NAME);
+ goto exit_free;
+ }
+
+ /* Register sysfs hooks */
+ err = sysfs_create_group(&dev->kobj, &bmp085_attr_group);
+ if (err)
+ goto exit_free;
+
+ dev_info(dev, "Successfully initialized %s!\n", BMP085_NAME);
+
+ return 0;
+
+exit_free:
+ kfree(data);
+exit:
+ return err;
+}
+EXPORT_SYMBOL_GPL(bmp085_probe);
+
+int bmp085_remove(struct device *dev)
+{
+ struct bmp085_data *data = dev_get_drvdata(dev);
+
+ sysfs_remove_group(&data->dev->kobj, &bmp085_attr_group);
+ kfree(data);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(bmp085_remove);
+
+MODULE_AUTHOR("Christoph Mair <christoph.mair@gmail.com>");
+MODULE_DESCRIPTION("BMP085 driver");
+MODULE_LICENSE("GPL");