[PATCHv4 0/3] bmp085: add support for bmp18x chip

[PATCHv4 0/3] bmp085: add support for bmp18x chip

[Eric Andersson]

Hi,

This is version 4 of the patch-set that adds support for the latest pressure
sensors from Bosch Sensortec.

Changes from last version:
- Fixed some typos
- Fixed regmap error handling
- Use devm_regmap_init_i2c()
- Changed devicetree compatible string

--
Best regards,
 Eric

   http://www.unixphere.com

Eric Andersson (3):
  misc: clean up bmp085 driver
  misc: bmp085: add device tree properties
  misc: add support for bmp18x chips to the bmp085 driver

 Documentation/devicetree/bindings/misc/bmp085.txt |   20 ++
 drivers/misc/Kconfig                              |   26 ++-
 drivers/misc/Makefile                             |    2 +
 drivers/misc/bmp085-i2c.c                         |   91 ++++++
 drivers/misc/bmp085-spi.c                         |   91 ++++++
 drivers/misc/bmp085.c                             |  356 +++++++++++----------
 drivers/misc/bmp085.h                             |   33 ++
 7 files changed, 440 insertions(+), 179 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/misc/bmp085.txt
 create mode 100644 drivers/misc/bmp085-i2c.c
 create mode 100644 drivers/misc/bmp085-spi.c
 create mode 100644 drivers/misc/bmp085.h

-- 
1.7.3.4

[PATCHv4 1/3] misc: clean up bmp085 driver

[Eric Andersson]

This patch includes various cleaning of the bmp085 driver including:
- Whitespaces and alignment fixes
- Minor typos
- Consistency fixes

Reviewed-by: Stefan Nilsson <stefan.nilsson@unixphere.com>
Signed-off-by: Eric Andersson <eric.andersson@unixphere.com>
---
 drivers/misc/bmp085.c |  206 ++++++++++++++++++++++++------------------------
 1 files changed, 103 insertions(+), 103 deletions(-)

diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 76c3064..6f572bc 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -1,62 +1,63 @@
 /*  Copyright (c) 2010  Christoph Mair <christoph.mair@gmail.com>
-
-    This driver supports the bmp085 digital barometric pressure
-    and temperature sensor from Bosch Sensortec. The datasheet
-    is available from their website:
-    http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP085-DS000-05.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.
-*/
-
+ *  Copyright (c) 2012  Bosch Sensortec GmbH
+ *  Copyright (c) 2012  Unixphere AB
+ *
+ *  This driver supports the bmp085 digital barometric pressure
+ *  and temperature sensor from Bosch Sensortec. The datasheet
+ *  is available from their website:
+ *  http://www.bosch-sensortec.com/content/language1/downloads/BST-BMP085-DS000-05.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/init.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 
-
+#define BMP085_NAME			"bmp085"
 #define BMP085_I2C_ADDRESS		0x77
 #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_VERSION_REG		0xD1
 #define BMP085_CTRL_REG			0xF4
 #define BMP085_TEMP_MEASUREMENT		0x2E
 #define BMP085_PRESSURE_MEASUREMENT	0x34
@@ -65,9 +66,6 @@
 #define BMP085_CONVERSION_REGISTER_XLSB	0xF8
 #define BMP085_TEMP_CONVERSION_TIME	5
 
-#define BMP085_CLIENT_NAME		"bmp085"
-
-
 static const unsigned short normal_i2c[] = { BMP085_I2C_ADDRESS,
 							I2C_CLIENT_END };
 
@@ -78,20 +76,18 @@ struct bmp085_calibration_data {
 	s16 MB, MC, MD;
 };
 
-
-/* Each client has this additional data */
 struct bmp085_data {
-	struct i2c_client *client;
-	struct mutex lock;
-	struct bmp085_calibration_data calibration;
-	u32 raw_temperature;
-	u32 raw_pressure;
-	unsigned char oversampling_setting;
+	struct	i2c_client *client;
+	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;
-	s32 b6; /* calculated temperature correction coefficient */
+	s32	b6; /* calculated temperature correction coefficient */
 };
 
-
 static s32 bmp085_read_calibration_data(struct i2c_client *client)
 {
 	u16 tmp[BMP085_CALIBRATION_DATA_LENGTH];
@@ -99,12 +95,12 @@ static s32 bmp085_read_calibration_data(struct i2c_client *client)
 	struct bmp085_calibration_data *cali = &(data->calibration);
 	s32 status = i2c_smbus_read_i2c_block_data(client,
 				BMP085_CALIBRATION_DATA_START,
-				BMP085_CALIBRATION_DATA_LENGTH*sizeof(u16),
+				(BMP085_CALIBRATION_DATA_LENGTH << 1),
 				(u8 *)tmp);
 	if (status < 0)
 		return status;
 
-	if (status != BMP085_CALIBRATION_DATA_LENGTH*sizeof(u16))
+	if (status != (BMP085_CALIBRATION_DATA_LENGTH << 1))
 		return -EIO;
 
 	cali->AC1 =  be16_to_cpu(tmp[0]);
@@ -121,7 +117,6 @@ static s32 bmp085_read_calibration_data(struct i2c_client *client)
 	return 0;
 }
 
-
 static s32 bmp085_update_raw_temperature(struct bmp085_data *data)
 {
 	u16 tmp;
@@ -130,7 +125,7 @@ static s32 bmp085_update_raw_temperature(struct bmp085_data *data)
 	mutex_lock(&data->lock);
 	status = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG,
 						BMP085_TEMP_MEASUREMENT);
-	if (status != 0) {
+	if (status < 0) {
 		dev_err(&data->client->dev,
 			"Error while requesting temperature measurement.\n");
 		goto exit;
@@ -163,8 +158,9 @@ static s32 bmp085_update_raw_pressure(struct bmp085_data *data)
 
 	mutex_lock(&data->lock);
 	status = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG,
-		BMP085_PRESSURE_MEASUREMENT + (data->oversampling_setting<<6));
-	if (status != 0) {
+			BMP085_PRESSURE_MEASUREMENT +
+			(data->oversampling_setting << 6));
+	if (status < 0) {
 		dev_err(&data->client->dev,
 			"Error while requesting pressure measurement.\n");
 		goto exit;
@@ -193,7 +189,6 @@ exit:
 	return status;
 }
 
-
 /*
  * This function starts the temperature measurement and returns the value
  * in tenth of a degree celsius.
@@ -205,7 +200,7 @@ static s32 bmp085_get_temperature(struct bmp085_data *data, int *temperature)
 	int status;
 
 	status = bmp085_update_raw_temperature(data);
-	if (status != 0)
+	if (status < 0)
 		goto exit;
 
 	x1 = ((data->raw_temperature - cali->AC6) * cali->AC5) >> 15;
@@ -222,8 +217,10 @@ exit:
 /*
  * 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 if the last known value is older
- * than one second.
+ * 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)
 {
@@ -234,16 +231,16 @@ static s32 bmp085_get_pressure(struct bmp085_data *data, int *pressure)
 	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)) {
+	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)
-			goto exit;
+		if (status < 0)
+			return status;
 	}
 
 	status = bmp085_update_raw_pressure(data);
-	if (status != 0)
-		goto exit;
+	if (status < 0)
+		return status;
 
 	x1 = (data->b6 * data->b6) >> 12;
 	x1 *= cali->B2;
@@ -274,15 +271,14 @@ static s32 bmp085_get_pressure(struct bmp085_data *data, int *pressure)
 
 	*pressure = p;
 
-exit:
-	return status;
+	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 on overview on how measurement time,
+ * increase both. The datasheet gives an overview on how measurement time,
  * accuracy and noise correlate.
  */
 static void bmp085_set_oversampling(struct bmp085_data *data,
@@ -309,12 +305,16 @@ static ssize_t set_oversampling(struct device *dev,
 	struct i2c_client *client = to_i2c_client(dev);
 	struct bmp085_data *data = i2c_get_clientdata(client);
 	unsigned long oversampling;
-	int success = strict_strtoul(buf, 10, &oversampling);
-	if (success == 0) {
+	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 success;
+
+	return err;
 }
 
 static ssize_t show_oversampling(struct device *dev,
@@ -322,6 +322,7 @@ static ssize_t show_oversampling(struct device *dev,
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct bmp085_data *data = i2c_get_clientdata(client);
+
 	return sprintf(buf, "%u\n", bmp085_get_oversampling(data));
 }
 static DEVICE_ATTR(oversampling, S_IWUSR | S_IRUGO,
@@ -337,7 +338,7 @@ static ssize_t show_temperature(struct device *dev,
 	struct bmp085_data *data = i2c_get_clientdata(client);
 
 	status = bmp085_get_temperature(data, &temperature);
-	if (status != 0)
+	if (status < 0)
 		return status;
 	else
 		return sprintf(buf, "%d\n", temperature);
@@ -354,7 +355,7 @@ static ssize_t show_pressure(struct device *dev,
 	struct bmp085_data *data = i2c_get_clientdata(client);
 
 	status = bmp085_get_pressure(data, &pressure);
-	if (status != 0)
+	if (status < 0)
 		return status;
 	else
 		return sprintf(buf, "%d\n", pressure);
@@ -386,25 +387,23 @@ static int bmp085_detect(struct i2c_client *client, struct i2c_board_info *info)
 
 static int bmp085_init_client(struct i2c_client *client)
 {
-	unsigned char version;
-	int status;
 	struct bmp085_data *data = i2c_get_clientdata(client);
+	int status = bmp085_read_calibration_data(client);
+
+	if (status < 0)
+		return status;
+
 	data->client = client;
-	status = bmp085_read_calibration_data(client);
-	if (status != 0)
-		goto exit;
-	version = i2c_smbus_read_byte_data(client, BMP085_VERSION_REG);
 	data->last_temp_measurement = 0;
+	data->temp_measurement_period = 1*HZ;
 	data->oversampling_setting = 3;
 	mutex_init(&data->lock);
-	dev_info(&data->client->dev, "BMP085 ver. %d.%d found.\n",
-			(version & 0x0F), (version & 0xF0) >> 4);
-exit:
-	return status;
+
+	return 0;
 }
 
 static int __devinit bmp085_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
+			const struct i2c_device_id *id)
 {
 	struct bmp085_data *data;
 	int err = 0;
@@ -415,14 +414,11 @@ static int __devinit bmp085_probe(struct i2c_client *client,
 		goto exit;
 	}
 
-	/* default settings after POR */
-	data->oversampling_setting = 0x00;
-
 	i2c_set_clientdata(client, data);
 
 	/* Initialize the BMP085 chip */
 	err = bmp085_init_client(client);
-	if (err != 0)
+	if (err < 0)
 		goto exit_free;
 
 	/* Register sysfs hooks */
@@ -430,8 +426,9 @@ static int __devinit bmp085_probe(struct i2c_client *client,
 	if (err)
 		goto exit_free;
 
-	dev_info(&data->client->dev, "Successfully initialized bmp085!\n");
-	goto exit;
+	dev_info(&client->dev, "Successfully initialized %s!\n", BMP085_NAME);
+
+	return 0;
 
 exit_free:
 	kfree(data);
@@ -441,13 +438,16 @@ exit:
 
 static int __devexit bmp085_remove(struct i2c_client *client)
 {
+	struct bmp085_data *data = i2c_get_clientdata(client);
+
 	sysfs_remove_group(&client->dev.kobj, &bmp085_attr_group);
-	kfree(i2c_get_clientdata(client));
+	kfree(data);
+
 	return 0;
 }
 
 static const struct i2c_device_id bmp085_id[] = {
-	{ "bmp085", 0 },
+	{ BMP085_NAME, 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, bmp085_id);
@@ -455,7 +455,7 @@ MODULE_DEVICE_TABLE(i2c, bmp085_id);
 static struct i2c_driver bmp085_driver = {
 	.driver = {
 		.owner = THIS_MODULE,
-		.name	= "bmp085"
+		.name	= BMP085_NAME
 	},
 	.id_table	= bmp085_id,
 	.probe		= bmp085_probe,
@@ -467,6 +467,6 @@ static struct i2c_driver bmp085_driver = {
 
 module_i2c_driver(bmp085_driver);
 
-MODULE_AUTHOR("Christoph Mair <christoph.mair@gmail.com");
+MODULE_AUTHOR("Christoph Mair <christoph.mair@gmail.com>");
 MODULE_DESCRIPTION("BMP085 driver");
 MODULE_LICENSE("GPL");
-- 
1.7.3.4

[PATCHv4 2/3] misc: bmp085: add device tree properties

[Eric Andersson]

Reviewed-by: Stefan Nilsson <stefan.nilsson@unixphere.com>
Signed-off-by: Eric Andersson <eric.andersson@unixphere.com>
---
 Documentation/devicetree/bindings/misc/bmp085.txt |   20 +++++++++++
 drivers/misc/bmp085.c                             |   37 ++++++++++++++++++++-
 2 files changed, 56 insertions(+), 1 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/misc/bmp085.txt

diff --git a/Documentation/devicetree/bindings/misc/bmp085.txt b/Documentation/devicetree/bindings/misc/bmp085.txt
new file mode 100644
index 0000000..91dfda2
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/bmp085.txt
@@ -0,0 +1,20 @@
+BMP085/BMP18x digital pressure sensors
+
+Required properties:
+- compatible: bosch,bmp085
+
+Optional properties:
+- chip-id: configurable chip id for non-default chip revisions
+- temp-measurement-period: temperature measurement period (milliseconds)
+- default-oversampling: default oversampling value to be used at startup,
+  value range is 0-3 with rising sensitivity.
+
+Example:
+
+pressure@77 {
+	compatible = "bosch,bmp085";
+	reg = <0x77>;
+	chip-id = <10>;
+	temp-measurement-period = <100>;
+	default-oversampling = <2>;
+};
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 6f572bc..6adde9e 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -50,6 +50,7 @@
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/of.h>
 
 #define BMP085_NAME			"bmp085"
 #define BMP085_I2C_ADDRESS		0x77
@@ -85,6 +86,7 @@ struct bmp085_data {
 	u32	raw_pressure;
 	u32	temp_measurement_period;
 	unsigned long last_temp_measurement;
+	u8	chip_id;
 	s32	b6; /* calculated temperature correction coefficient */
 };
 
@@ -385,6 +387,27 @@ static int bmp085_detect(struct i2c_client *client, struct i2c_board_info *info)
 	return 0;
 }
 
+static void __init bmp085_get_of_properties(struct i2c_client *client,
+					    struct bmp085_data *data)
+{
+#ifdef CONFIG_OF
+	struct device_node *np = client->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 i2c_client *client)
 {
 	struct bmp085_data *data = i2c_get_clientdata(client);
@@ -393,10 +416,15 @@ static int bmp085_init_client(struct i2c_client *client)
 	if (status < 0)
 		return status;
 
+	/* default settings */
 	data->client = client;
+	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(client, data);
+
 	mutex_init(&data->lock);
 
 	return 0;
@@ -446,6 +474,12 @@ static int __devexit bmp085_remove(struct i2c_client *client)
 	return 0;
 }
 
+static const struct of_device_id bmp085_of_match[] = {
+	{ .compatible = "bosch,bmp085", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, bmp085_of_match);
+
 static const struct i2c_device_id bmp085_id[] = {
 	{ BMP085_NAME, 0 },
 	{ }
@@ -455,7 +489,8 @@ MODULE_DEVICE_TABLE(i2c, bmp085_id);
 static struct i2c_driver bmp085_driver = {
 	.driver = {
 		.owner = THIS_MODULE,
-		.name	= BMP085_NAME
+		.name	= BMP085_NAME,
+		.of_match_table = bmp085_of_match
 	},
 	.id_table	= bmp085_id,
 	.probe		= bmp085_probe,
-- 
1.7.3.4

[PATCHv4 3/3] misc: add support for bmp18x chips to the bmp085 driver

[Eric Andersson]

The bmp18x chip family comes in an I2C respectively SPI variant.
Hence, the bmp085 driver was split to support both buses.

Tested-by: Zhengguang Guo <zhengguang.guo@bosch-sensortec.com>
Reviewed-by: Stefan Nilsson <stefan.nilsson@unixphere.com>
Signed-off-by: Eric Andersson <eric.andersson@unixphere.com>
---
 drivers/misc/Kconfig      |   26 ++++++-
 drivers/misc/Makefile     |    2 +
 drivers/misc/bmp085-i2c.c |   91 +++++++++++++++++++++++++
 drivers/misc/bmp085-spi.c |   91 +++++++++++++++++++++++++
 drivers/misc/bmp085.c     |  163 ++++++++++++++++++--------------------------
 drivers/misc/bmp085.h     |   33 +++++++++
 6 files changed, 306 insertions(+), 100 deletions(-)
 create mode 100644 drivers/misc/bmp085-i2c.c
 create mode 100644 drivers/misc/bmp085-spi.c
 create mode 100644 drivers/misc/bmp085.h

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index c779509..9684695 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -452,14 +452,32 @@ config ARM_CHARLCD
 	  still useful.
 
 config BMP085
-	tristate "BMP085 digital pressure sensor"
+	bool
+	depends on SYSFS
+
+config BMP085_I2C
+	tristate "BMP085 digital pressure sensor on I2C"
+	select BMP085
+	select REGMAP_I2C
 	depends on I2C && SYSFS
 	help
-	  If you say yes here you get support for the Bosch Sensortec
-	  BMP085 digital pressure sensor.
+	  Say Y here if you want to support Bosch Sensortec's digital pressure
+	  sensor hooked to an I2C bus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bmp085-i2c.
+
+config BMP085_SPI
+	tristate "BMP085 digital pressure sensor on SPI"
+	select BMP085
+	select REGMAP_SPI
+	depends on SPI_MASTER && SYSFS
+	help
+	  Say Y here if you want to support Bosch Sensortec's digital pressure
+	  sensor hooked to an SPI bus.
 
 	  To compile this driver as a module, choose M here: the
-	  module will be called bmp085.
+	  module will be called bmp085-spi.
 
 config PCH_PHUB
 	tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) PHUB"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 3e1d801..509d056 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -11,6 +11,8 @@ obj-$(CONFIG_ATMEL_PWM)		+= atmel_pwm.o
 obj-$(CONFIG_ATMEL_SSC)		+= atmel-ssc.o
 obj-$(CONFIG_ATMEL_TCLIB)	+= atmel_tclib.o
 obj-$(CONFIG_BMP085)		+= bmp085.o
+obj-$(CONFIG_BMP085_I2C)	+= bmp085-i2c.o
+obj-$(CONFIG_BMP085_SPI)	+= bmp085-spi.o
 obj-$(CONFIG_ICS932S401)	+= ics932s401.o
 obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
diff --git a/drivers/misc/bmp085-i2c.c b/drivers/misc/bmp085-i2c.c
new file mode 100644
index 0000000..9943971
--- /dev/null
+++ b/drivers/misc/bmp085-i2c.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2012  Bosch Sensortec GmbH
+ * Copyright (c) 2012  Unixphere AB
+ *
+ * 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/i2c.h>
+#include <linux/err.h>
+#include "bmp085.h"
+
+#define BMP085_I2C_ADDRESS	0x77
+
+static const unsigned short normal_i2c[] = { BMP085_I2C_ADDRESS,
+							I2C_CLIENT_END };
+
+static int bmp085_i2c_detect(struct i2c_client *client,
+			     struct i2c_board_info *info)
+{
+	if (client->addr != BMP085_I2C_ADDRESS)
+		return -ENODEV;
+
+	return bmp085_detect(&client->dev);
+}
+
+static int __devinit bmp085_i2c_probe(struct i2c_client *client,
+				      const struct i2c_device_id *id)
+{
+	int err;
+	struct regmap *regmap = devm_regmap_init_i2c(client,
+						     &bmp085_regmap_config);
+
+	if (IS_ERR(regmap)) {
+		err = PTR_ERR(regmap);
+		dev_err(&client->dev, "Failed to init regmap: %d\n", err);
+		return err;
+	}
+
+	return bmp085_probe(&client->dev, regmap);
+}
+
+static int bmp085_i2c_remove(struct i2c_client *client)
+{
+	return bmp085_remove(&client->dev);
+}
+
+static const struct of_device_id bmp085_of_match[] = {
+	{ .compatible = "bosch,bmp085", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, bmp085_of_match);
+
+static const struct i2c_device_id bmp085_id[] = {
+	{ BMP085_NAME, 0 },
+	{ "bmp180", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, bmp085_id);
+
+static struct i2c_driver bmp085_i2c_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= BMP085_NAME,
+		.of_match_table = bmp085_of_match
+	},
+	.id_table	= bmp085_id,
+	.probe		= bmp085_i2c_probe,
+	.remove		= __devexit_p(bmp085_i2c_remove),
+
+	.detect		= bmp085_i2c_detect,
+	.address_list	= normal_i2c
+};
+
+module_i2c_driver(bmp085_i2c_driver);
+
+MODULE_AUTHOR("Eric Andersson <eric.andersson@unixphere.com>");
+MODULE_DESCRIPTION("BMP085 I2C bus driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/bmp085-spi.c b/drivers/misc/bmp085-spi.c
new file mode 100644
index 0000000..78aaff9
--- /dev/null
+++ b/drivers/misc/bmp085-spi.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2012  Bosch Sensortec GmbH
+ * Copyright (c) 2012  Unixphere AB
+ *
+ * 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/spi/spi.h>
+#include <linux/err.h>
+#include "bmp085.h"
+
+static int __devinit bmp085_spi_probe(struct spi_device *client)
+{
+	int err;
+	struct regmap *regmap;
+
+	client->bits_per_word = 8;
+	err = spi_setup(client);
+	if (err < 0) {
+		dev_err(&client->dev, "spi_setup failed!\n");
+		return err;
+	}
+
+	regmap = devm_regmap_init_spi(client, &bmp085_regmap_config);
+	if (IS_ERR(regmap)) {
+		err = PTR_ERR(regmap);
+		dev_err(&client->dev, "Failed to init regmap: %d\n", err);
+		return err;
+	}
+
+	return bmp085_probe(&client->dev, regmap);
+}
+
+static int bmp085_spi_remove(struct spi_device *client)
+{
+	return bmp085_remove(&client->dev);
+}
+
+static const struct of_device_id bmp085_of_match[] = {
+	{ .compatible = "bosch,bmp085", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, bmp085_of_match);
+
+static const struct spi_device_id bmp085_id[] = {
+	{ "bmp180", 0 },
+	{ "bmp181", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, bmp085_id);
+
+static struct spi_driver bmp085_spi_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= BMP085_NAME,
+		.of_match_table = bmp085_of_match
+	},
+	.id_table	= bmp085_id,
+	.probe		= bmp085_spi_probe,
+	.remove		= __devexit_p(bmp085_spi_remove)
+};
+
+static int __init bmp085_spi_init(void)
+{
+	return spi_register_driver(&bmp085_spi_driver);
+}
+
+static void __exit bmp085_spi_exit(void)
+{
+	spi_unregister_driver(&bmp085_spi_driver);
+}
+
+MODULE_AUTHOR("Eric Andersson <eric.andersson@unixphere.com>");
+MODULE_DESCRIPTION("BMP085 SPI bus driver");
+MODULE_LICENSE("GPL");
+
+module_init(bmp085_spi_init);
+module_exit(bmp085_spi_exit);
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 6adde9e..62e4182 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -2,10 +2,11 @@
  *  Copyright (c) 2012  Bosch Sensortec GmbH
  *  Copyright (c) 2012  Unixphere AB
  *
- *  This driver supports the bmp085 digital barometric pressure
- *  and temperature sensor from Bosch Sensortec. The datasheet
- *  is available from their website:
+ *  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
@@ -47,15 +48,12 @@
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/init.h>
-#include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/of.h>
+#include "bmp085.h"
 
-#define BMP085_NAME			"bmp085"
-#define BMP085_I2C_ADDRESS		0x77
 #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
@@ -67,9 +65,6 @@
 #define BMP085_CONVERSION_REGISTER_XLSB	0xF8
 #define BMP085_TEMP_CONVERSION_TIME	5
 
-static const unsigned short normal_i2c[] = { BMP085_I2C_ADDRESS,
-							I2C_CLIENT_END };
-
 struct bmp085_calibration_data {
 	s16 AC1, AC2, AC3;
 	u16 AC4, AC5, AC6;
@@ -78,7 +73,8 @@ struct bmp085_calibration_data {
 };
 
 struct bmp085_data {
-	struct	i2c_client *client;
+	struct	device *dev;
+	struct  regmap *regmap;
 	struct	mutex lock;
 	struct	bmp085_calibration_data calibration;
 	u8	oversampling_setting;
@@ -90,21 +86,16 @@ struct bmp085_data {
 	s32	b6; /* calculated temperature correction coefficient */
 };
 
-static s32 bmp085_read_calibration_data(struct i2c_client *client)
+static s32 bmp085_read_calibration_data(struct bmp085_data *data)
 {
 	u16 tmp[BMP085_CALIBRATION_DATA_LENGTH];
-	struct bmp085_data *data = i2c_get_clientdata(client);
 	struct bmp085_calibration_data *cali = &(data->calibration);
-	s32 status = i2c_smbus_read_i2c_block_data(client,
-				BMP085_CALIBRATION_DATA_START,
-				(BMP085_CALIBRATION_DATA_LENGTH << 1),
-				(u8 *)tmp);
+	s32 status = regmap_bulk_read(data->regmap,
+				BMP085_CALIBRATION_DATA_START, (u8 *)tmp,
+				(BMP085_CALIBRATION_DATA_LENGTH << 1));
 	if (status < 0)
 		return status;
 
-	if (status != (BMP085_CALIBRATION_DATA_LENGTH << 1))
-		return -EIO;
-
 	cali->AC1 =  be16_to_cpu(tmp[0]);
 	cali->AC2 =  be16_to_cpu(tmp[1]);
 	cali->AC3 =  be16_to_cpu(tmp[2]);
@@ -125,23 +116,20 @@ static s32 bmp085_update_raw_temperature(struct bmp085_data *data)
 	s32 status;
 
 	mutex_lock(&data->lock);
-	status = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG,
-						BMP085_TEMP_MEASUREMENT);
+	status = regmap_write(data->regmap, BMP085_CTRL_REG,
+			      BMP085_TEMP_MEASUREMENT);
 	if (status < 0) {
-		dev_err(&data->client->dev,
+		dev_err(data->dev,
 			"Error while requesting temperature measurement.\n");
 		goto exit;
 	}
 	msleep(BMP085_TEMP_CONVERSION_TIME);
 
-	status = i2c_smbus_read_i2c_block_data(data->client,
-		BMP085_CONVERSION_REGISTER_MSB, sizeof(tmp), (u8 *)&tmp);
-	if (status < 0)
-		goto exit;
-	if (status != sizeof(tmp)) {
-		dev_err(&data->client->dev,
+	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");
-		status = -EIO;
 		goto exit;
 	}
 	data->raw_temperature = be16_to_cpu(tmp);
@@ -159,11 +147,11 @@ static s32 bmp085_update_raw_pressure(struct bmp085_data *data)
 	s32 status;
 
 	mutex_lock(&data->lock);
-	status = i2c_smbus_write_byte_data(data->client, BMP085_CTRL_REG,
+	status = regmap_write(data->regmap, BMP085_CTRL_REG,
 			BMP085_PRESSURE_MEASUREMENT +
 			(data->oversampling_setting << 6));
 	if (status < 0) {
-		dev_err(&data->client->dev,
+		dev_err(data->dev,
 			"Error while requesting pressure measurement.\n");
 		goto exit;
 	}
@@ -172,14 +160,11 @@ static s32 bmp085_update_raw_pressure(struct bmp085_data *data)
 	msleep(2+(3 << data->oversampling_setting));
 
 	/* copy data into a u32 (4 bytes), but skip the first byte. */
-	status = i2c_smbus_read_i2c_block_data(data->client,
-			BMP085_CONVERSION_REGISTER_MSB, 3, ((u8 *)&tmp)+1);
-	if (status < 0)
-		goto exit;
-	if (status != 3) {
-		dev_err(&data->client->dev,
+	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");
-		status = -EIO;
 		goto exit;
 	}
 	data->raw_pressure = be32_to_cpu((tmp));
@@ -304,8 +289,7 @@ static ssize_t set_oversampling(struct device *dev,
 				struct device_attribute *attr,
 				const char *buf, size_t count)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct bmp085_data *data = i2c_get_clientdata(client);
+	struct bmp085_data *data = dev_get_drvdata(dev);
 	unsigned long oversampling;
 	int err = kstrtoul(buf, 10, &oversampling);
 
@@ -322,8 +306,7 @@ static ssize_t set_oversampling(struct device *dev,
 static ssize_t show_oversampling(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct bmp085_data *data = i2c_get_clientdata(client);
+	struct bmp085_data *data = dev_get_drvdata(dev);
 
 	return sprintf(buf, "%u\n", bmp085_get_oversampling(data));
 }
@@ -336,8 +319,7 @@ static ssize_t show_temperature(struct device *dev,
 {
 	int temperature;
 	int status;
-	struct i2c_client *client = to_i2c_client(dev);
-	struct bmp085_data *data = i2c_get_clientdata(client);
+	struct bmp085_data *data = dev_get_drvdata(dev);
 
 	status = bmp085_get_temperature(data, &temperature);
 	if (status < 0)
@@ -353,8 +335,7 @@ static ssize_t show_pressure(struct device *dev,
 {
 	int pressure;
 	int status;
-	struct i2c_client *client = to_i2c_client(dev);
-	struct bmp085_data *data = i2c_get_clientdata(client);
+	struct bmp085_data *data = dev_get_drvdata(dev);
 
 	status = bmp085_get_pressure(data, &pressure);
 	if (status < 0)
@@ -376,22 +357,27 @@ static const struct attribute_group bmp085_attr_group = {
 	.attrs = bmp085_attributes,
 };
 
-static int bmp085_detect(struct i2c_client *client, struct i2c_board_info *info)
+int bmp085_detect(struct device *dev)
 {
-	if (client->addr != BMP085_I2C_ADDRESS)
-		return -ENODEV;
+	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 (i2c_smbus_read_byte_data(client, BMP085_CHIP_ID_REG) != BMP085_CHIP_ID)
+	if (id != data->chip_id)
 		return -ENODEV;
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(bmp085_detect);
 
-static void __init bmp085_get_of_properties(struct i2c_client *client,
-					    struct bmp085_data *data)
+static void __init bmp085_get_of_properties(struct bmp085_data *data)
 {
 #ifdef CONFIG_OF
-	struct device_node *np = client->dev.of_node;
+	struct device_node *np = data->dev->of_node;
 	u32 prop;
 
 	if (!np)
@@ -408,30 +394,33 @@ static void __init bmp085_get_of_properties(struct i2c_client *client,
 #endif
 }
 
-static int bmp085_init_client(struct i2c_client *client)
+static int bmp085_init_client(struct bmp085_data *data)
 {
-	struct bmp085_data *data = i2c_get_clientdata(client);
-	int status = bmp085_read_calibration_data(client);
+	int status = bmp085_read_calibration_data(data);
 
 	if (status < 0)
 		return status;
 
 	/* default settings */
-	data->client = client;
 	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(client, data);
+	bmp085_get_of_properties(data);
 
 	mutex_init(&data->lock);
 
 	return 0;
 }
 
-static int __devinit bmp085_probe(struct i2c_client *client,
-			const struct i2c_device_id *id)
+struct regmap_config bmp085_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8
+};
+EXPORT_SYMBOL_GPL(bmp085_regmap_config);
+
+__devinit int bmp085_probe(struct device *dev, struct regmap *regmap)
 {
 	struct bmp085_data *data;
 	int err = 0;
@@ -442,19 +431,27 @@ static int __devinit bmp085_probe(struct i2c_client *client,
 		goto exit;
 	}
 
-	i2c_set_clientdata(client, data);
+	dev_set_drvdata(dev, data);
+	data->dev = dev;
+	data->regmap = regmap;
 
 	/* Initialize the BMP085 chip */
-	err = bmp085_init_client(client);
+	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(&client->dev.kobj, &bmp085_attr_group);
+	err = sysfs_create_group(&dev->kobj, &bmp085_attr_group);
 	if (err)
 		goto exit_free;
 
-	dev_info(&client->dev, "Successfully initialized %s!\n", BMP085_NAME);
+	dev_info(dev, "Successfully initialized %s!\n", BMP085_NAME);
 
 	return 0;
 
@@ -463,44 +460,18 @@ exit_free:
 exit:
 	return err;
 }
+EXPORT_SYMBOL_GPL(bmp085_probe);
 
-static int __devexit bmp085_remove(struct i2c_client *client)
+int bmp085_remove(struct device *dev)
 {
-	struct bmp085_data *data = i2c_get_clientdata(client);
+	struct bmp085_data *data = dev_get_drvdata(dev);
 
-	sysfs_remove_group(&client->dev.kobj, &bmp085_attr_group);
+	sysfs_remove_group(&data->dev->kobj, &bmp085_attr_group);
 	kfree(data);
 
 	return 0;
 }
-
-static const struct of_device_id bmp085_of_match[] = {
-	{ .compatible = "bosch,bmp085", },
-	{ },
-};
-MODULE_DEVICE_TABLE(of, bmp085_of_match);
-
-static const struct i2c_device_id bmp085_id[] = {
-	{ BMP085_NAME, 0 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, bmp085_id);
-
-static struct i2c_driver bmp085_driver = {
-	.driver = {
-		.owner = THIS_MODULE,
-		.name	= BMP085_NAME,
-		.of_match_table = bmp085_of_match
-	},
-	.id_table	= bmp085_id,
-	.probe		= bmp085_probe,
-	.remove		= __devexit_p(bmp085_remove),
-
-	.detect		= bmp085_detect,
-	.address_list	= normal_i2c
-};
-
-module_i2c_driver(bmp085_driver);
+EXPORT_SYMBOL_GPL(bmp085_remove);
 
 MODULE_AUTHOR("Christoph Mair <christoph.mair@gmail.com>");
 MODULE_DESCRIPTION("BMP085 driver");
diff --git a/drivers/misc/bmp085.h b/drivers/misc/bmp085.h
new file mode 100644
index 0000000..2b8f615
--- /dev/null
+++ b/drivers/misc/bmp085.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2012  Bosch Sensortec GmbH
+ * Copyright (c) 2012  Unixphere AB
+ *
+ * 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.
+ */
+
+#ifndef _BMP085_H
+#define _BMP085_H
+
+#include <linux/regmap.h>
+
+#define BMP085_NAME		"bmp085"
+
+extern struct regmap_config bmp085_regmap_config;
+
+int bmp085_probe(struct device *dev, struct regmap *regmap);
+int bmp085_remove(struct device *dev);
+int bmp085_detect(struct device *dev);
+
+#endif
-- 
1.7.3.4

Re: [PATCHv4 3/3] misc: add support for bmp18x chips to the bmp085 driver

[Mark Brown]

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On Thu, Apr 05, 2012 at 09:22:15AM +0200, Eric Andersson wrote:
> The bmp18x chip family comes in an I2C respectively SPI variant.
> Hence, the bmp085 driver was split to support both buses.
> 
> Tested-by: Zhengguang Guo <zhengguang.guo@bosch-sensortec.com>
> Reviewed-by: Stefan Nilsson <stefan.nilsson@unixphere.com>
> Signed-off-by: Eric Andersson <eric.andersson@unixphere.com>

Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

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