[lm-sensors] Accelerometer driver for STMicroeletronics-LIS331DL-three-axis-digital

Kalhan Trisal kalhan.trisal at intel.com
Sat Aug 15 03:00:30 CEST 2009


>From f63c311f0106f6fbcced05b168cf60f996621e47 Mon Sep 17 00:00:00 2001
From: Kalhan Trisal <kalhan.trisal at intel.com>
Date: Fri, 14 Aug 2009 20:44:56 -0400
Subject: [PATCH] STMicroeletronics-LIS331DL-three-axis-digital-accelrometer

submitting the patch with comments incorporated. 
This driver provides support for the LIS3331DL accelerometer
accelerometer, connected to I2C. The accelerometer data is readable via
sys/class/hwmon.

Signed-off-by: Kalhan Trisal <kalhan.trisal at intel.com>


---
 drivers/hwmon/Kconfig    |    8 ++
 drivers/hwmon/Makefile   |    1 +
 drivers/hwmon/lis331dl.c |  250 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 259 insertions(+), 0 deletions(-)
 create mode 100644 drivers/hwmon/lis331dl.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 2d50166..394a591 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1017,6 +1017,14 @@ config SENSORS_APPLESMC
 	  Say Y here if you have an applicable laptop and want to experience
 	  the awesome power of applesmc.
 
+config SENSORS_LIS331DL
+	tristate "STMicroeletronics LIS331DL three-axis digital accelerometer"
+	depends on I2C
+	help
+	  If you say yes here you get support for the Accelerometer  Devices
+	  Device can be configured using sysfs.
+	  x y Z data can be   accessible via sysfs.
+
 config HWMON_DEBUG_CHIP
 	bool "Hardware Monitoring Chip debugging messages"
 	default n
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index b793dce..3b1e424 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -89,6 +89,7 @@ obj-$(CONFIG_SENSORS_VT8231)	+= vt8231.o
 obj-$(CONFIG_SENSORS_W83627EHF)	+= w83627ehf.o
 obj-$(CONFIG_SENSORS_W83L785TS)	+= w83l785ts.o
 obj-$(CONFIG_SENSORS_W83L786NG)	+= w83l786ng.o
+obj-$(CONFIG_SENSORS_LIS331DL)	+= lis331dl.o
 
 ifeq ($(CONFIG_HWMON_DEBUG_CHIP),y)
 EXTRA_CFLAGS += -DDEBUG
diff --git a/drivers/hwmon/lis331dl.c b/drivers/hwmon/lis331dl.c
new file mode 100644
index 0000000..c8d6b84
--- /dev/null
+++ b/drivers/hwmon/lis331dl.c
@@ -0,0 +1,250 @@
+/*
+ * lis331dl.c - ST LIS331DL  Accelerometer Driver
+ *
+ * Copyright (C) 2009 Intel Corp
+ *
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+
+
+MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal at intel.com");
+MODULE_DESCRIPTION("STMacroelectronics LIS331DL Accelerometer Driver");
+MODULE_LICENSE("GPL v2");
+
+#define ACCEL_DATA_RATE_100HZ 0
+#define ACCEL_DATA_RATE_400HZ 1
+#define ACCEL_POWER_MODE_DOWN 0
+#define ACCEL_POWER_MODE_ACTIVE 1
+
+/* internal return values */
+
+struct lis331dl_data {
+	struct device *hwmon_dev;
+	struct mutex update_lock;
+};
+
+static ssize_t rate_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int ret_val, val;
+
+	val = i2c_smbus_read_byte_data(client, 0x20);
+	ret_val = (val & 0x80); /* 1= 400HZ 0= 100HZ */
+	if (ret_val == 0x80)
+		ret_val = ACCEL_DATA_RATE_400HZ;
+	return sprintf(buf, "%d\n", ret_val);
+
+}
+
+static ssize_t state_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int ret_val, val;
+
+	val = i2c_smbus_read_byte_data(client, 0x20);
+	ret_val = (val & 0x40);
+	if (ret_val == 0x40)
+		ret_val = ACCEL_POWER_MODE_ACTIVE;
+	return sprintf(buf, "%d\n", ret_val);
+}
+
+/* if adapter support multiple read better to use that device support that */
+static ssize_t xyz_pos_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	int x, y, z;
+	struct i2c_client *client = to_i2c_client(dev);
+
+	x = i2c_smbus_read_byte_data(client, 0x29);
+	y = i2c_smbus_read_byte_data(client, 0x2B);
+	z = i2c_smbus_read_byte_data(client, 0x2D);
+	return sprintf(buf, "%d, %d, %d \n", x, y, z);
+}
+
+static ssize_t rate_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct lis331dl_data *data = i2c_get_clientdata(client);
+	unsigned int ret_val, set_val;
+	unsigned long val;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+	ret_val = i2c_smbus_read_byte_data(client, 0x20);
+
+	mutex_lock(&data->update_lock);
+	if (val == ACCEL_DATA_RATE_100HZ)
+		set_val = (ret_val & 0x7F); /* setting the 8th bit to 0 */
+	else if (val == ACCEL_DATA_RATE_400HZ)
+		set_val = (ret_val | (1 << 7));
+	else
+		goto invarg;
+
+	i2c_smbus_write_byte_data(client, 0x20, set_val);
+	mutex_unlock(&data->update_lock);
+	return count;
+invarg:
+	mutex_unlock(&data->update_lock);
+	return -EINVAL;
+}
+
+static ssize_t state_store(struct device *dev,
+		struct device_attribute *attr, const  char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct lis331dl_data *data = i2c_get_clientdata(client);
+	unsigned int ret_val, set_val;
+	unsigned long val;
+
+	if (strict_strtoul(buf, 10, &val))
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	ret_val = i2c_smbus_read_byte_data(client, 0x20);
+	if (val == ACCEL_POWER_MODE_DOWN)
+		set_val = ret_val & 0xBF; /* if value id 0 */
+	else if (val == ACCEL_POWER_MODE_ACTIVE)
+		set_val = (ret_val | (1<<6)); /* if value is 1 */
+	else
+		goto invarg;
+
+	i2c_smbus_write_byte_data(client, 0x20, set_val);
+	mutex_unlock(&data->update_lock);
+	return count;
+invarg:
+	mutex_unlock(&data->update_lock);
+	return -EINVAL;
+}
+
+static DEVICE_ATTR(data_rate, S_IRUGO | S_IWUSR, rate_show, rate_store);
+static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, state_show, state_store);
+static DEVICE_ATTR(position, S_IRUGO, xyz_pos_show, NULL);
+
+static struct attribute *lis331dl_attr[] = {
+	&dev_attr_data_rate.attr,
+	&dev_attr_power_state.attr,
+	&dev_attr_position.attr,
+	NULL
+};
+
+static struct attribute_group lis331dl_gr = {
+	.attrs = lis331dl_attr
+};
+
+static void accel_set_default_config(struct i2c_client *client)
+{
+	/* Device is configured in
+	* 100Hz output data rate 7 bit 0
+	* active mode   6 bit 1
+	* x,y,z axix enable   0,1,2 bits 1*/
+	i2c_smbus_write_byte_data(client, 0x20, 0x47);
+}
+
+static int  lis331dl_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	int res;
+	struct lis331dl_data *data;
+
+	data = kzalloc(sizeof(struct lis331dl_data), GFP_KERNEL);
+	if (data == NULL) {
+		printk(KERN_WARNING "lis331dl: Memory initi failed \n");
+		return -ENOMEM;
+	}
+	mutex_init(&data->update_lock);
+	i2c_set_clientdata(client, data);
+
+	res = sysfs_create_group(&client->dev.kobj, &lis331dl_gr);
+	if (res) {
+		printk(KERN_WARNING "lis331dl: Sysfs  group failed!!\n");
+		goto acclero_error1;
+	}
+	data->hwmon_dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(data->hwmon_dev)) {
+		res = PTR_ERR(data->hwmon_dev);
+		data->hwmon_dev = NULL;
+		sysfs_remove_group(&client->dev.kobj, &lis331dl_gr);
+		printk(KERN_WARNING "lis331dl: unable to register \
+						hwmon device\n");
+		goto acclero_error1;
+	}
+	accel_set_default_config(client);
+
+	dev_info(&client->dev, "%s lis331dl:  Accelerometer chip \
+							foundn", client->name);
+	return res;
+
+acclero_error1:
+	i2c_set_clientdata(client, NULL);
+	kfree(data);
+	return res;
+}
+
+static int lis331dl_remove(struct i2c_client *client)
+{
+	struct lis331dl_data *data = i2c_get_clientdata(client);
+
+	hwmon_device_unregister(data->hwmon_dev);
+	sysfs_remove_group(&client->dev.kobj, &lis331dl_gr);
+	kfree(data);
+	return 0;
+}
+
+static struct i2c_device_id lis331dl_id[] = {
+	{ "lis331dl", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, lis331dl_id);
+
+static struct i2c_driver lis331dl_driver = {
+	.driver = {
+	.name = "lis331dl",
+	},
+	.probe = lis331dl_probe,
+	.remove = lis331dl_remove,
+	.id_table = lis331dl_id,
+};
+
+static int __init sensor_lis331dl_init(void)
+{
+	return  i2c_add_driver(&lis331dl_driver);
+}
+
+static void  __exit sensor_lis331dl_exit(void)
+{
+	i2c_del_driver(&lis331dl_driver);
+}
+
+module_init(sensor_lis331dl_init);
+module_exit(sensor_lis331dl_exit);
-- 
1.6.0.6





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