* [PATCHv4 1/3] misc: clean up bmp085 driver
2012-04-05 7:22 [PATCHv4 0/3] bmp085: add support for bmp18x chip Eric Andersson
@ 2012-04-05 7:22 ` Eric Andersson
2012-04-05 7:22 ` [PATCHv4 2/3] misc: bmp085: add device tree properties Eric Andersson
2012-04-05 7:22 ` [PATCHv4 3/3] misc: add support for bmp18x chips to the bmp085 driver Eric Andersson
2 siblings, 0 replies; 5+ messages in thread
From: Eric Andersson @ 2012-04-05 7:22 UTC (permalink / raw)
To: linux-kernel
Cc: gregkh, alan, arnd, zhengguang.guo, peter.moeller, stefan.nilsson,
broonie, christoph.mair, 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
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCHv4 2/3] misc: bmp085: add device tree properties
2012-04-05 7:22 [PATCHv4 0/3] bmp085: add support for bmp18x chip Eric Andersson
2012-04-05 7:22 ` [PATCHv4 1/3] misc: clean up bmp085 driver Eric Andersson
@ 2012-04-05 7:22 ` Eric Andersson
2012-04-05 7:22 ` [PATCHv4 3/3] misc: add support for bmp18x chips to the bmp085 driver Eric Andersson
2 siblings, 0 replies; 5+ messages in thread
From: Eric Andersson @ 2012-04-05 7:22 UTC (permalink / raw)
To: linux-kernel
Cc: gregkh, alan, arnd, zhengguang.guo, peter.moeller, stefan.nilsson,
broonie, christoph.mair, 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
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCHv4 3/3] misc: add support for bmp18x chips to the bmp085 driver
2012-04-05 7:22 [PATCHv4 0/3] bmp085: add support for bmp18x chip Eric Andersson
2012-04-05 7:22 ` [PATCHv4 1/3] misc: clean up bmp085 driver Eric Andersson
2012-04-05 7:22 ` [PATCHv4 2/3] misc: bmp085: add device tree properties Eric Andersson
@ 2012-04-05 7:22 ` Eric Andersson
2012-04-05 9:45 ` Mark Brown
2 siblings, 1 reply; 5+ messages in thread
From: Eric Andersson @ 2012-04-05 7:22 UTC (permalink / raw)
To: linux-kernel
Cc: gregkh, alan, arnd, zhengguang.guo, peter.moeller, stefan.nilsson,
broonie, christoph.mair, 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
^ permalink raw reply related [flat|nested] 5+ messages in thread