>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
