From: Kalhan Trisal <kalhan.trisal@xxxxxxxxx>
This driver will report the heading values in degrees to the sysfs interface.
The values returned are headings . e.g. 245.6
(Some cleanups from Alan Cox)
Signed-off-by: Kalhan Trisal <kalhan.trisal@xxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---
drivers/hwmon/Kconfig | 7 +
drivers/hwmon/Makefile | 1
drivers/hwmon/hmc6352.c | 235 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 243 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/hmc6352.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index d38447f..74f672d 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1088,6 +1088,13 @@ config SENSORS_MC13783_ADC
help
Support for the A/D converter on MC13783 PMIC.
+config SENSORS_HMC6352
+ tristate "Honeywell HMC6352 compass"
+ depends on I2C
+ help
+ This driver provides support for the Honeywell HMC6352 compass,
+ providing configuration and heading data via sysfs.
+
if ACPI
comment "ACPI drivers"
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 4aa1a3d..ad2ed36 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o
obj-$(CONFIG_SENSORS_ULTRA45) += ultra45_env.o
obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
+obj-$(CONFIG_SENSORS_HMC6352) += hmc6352.o
obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
diff --git a/drivers/hwmon/hmc6352.c b/drivers/hwmon/hmc6352.c
new file mode 100644
index 0000000..926982f
--- /dev/null
+++ b/drivers/hwmon/hmc6352.c
@@ -0,0 +1,235 @@
+/*
+ * hmc6352.c - Honeywell Compass 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>
+
+struct compass_data {
+ struct device *hwmon_dev;
+};
+
+static ssize_t compass_calibration_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret;
+ unsigned long val;
+ char cmd[] = {0x43};
+ char cmd1[] = {0x45};
+ struct i2c_msg msg[] = {
+ { client->addr, 0, 1, cmd },
+ };
+ struct i2c_msg msg1[] = {
+ { client->addr, 0, 1, cmd1 },
+ };
+
+ if (strict_strtoul(buf, 10, &val))
+ return -EINVAL;
+ if (val == 1) {
+ client->addr = 0x21;
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret != 1) {
+ dev_warn(dev, "hmc6352_comp : i2c callib start cmd failed\n");
+ return ret;
+ }
+ } else if (val == 2) {
+ client->addr = 0x21;
+ ret = i2c_transfer(client->adapter, msg1, 1);
+ if (ret != 1) {
+ dev_warn(dev, "hmc6352_comp : i2c callib stop cmd failed\n");
+ return ret;
+ }
+ } else
+ return -EINVAL;
+
+ return count;
+}
+
+static ssize_t compass_heading_data_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+
+ struct i2c_client *client = to_i2c_client(dev);
+ static char cmd[] = { 0x41 };
+ unsigned char i2c_data[2];
+ unsigned int ret, ret_val;
+ struct i2c_msg msg[] = {
+ { client->addr, 0, 1, cmd },
+ };
+ struct i2c_msg msg1[] = {
+ { client->addr, I2C_M_RD, 2, i2c_data },
+ };
+
+ client->addr = 0x21;
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret != 1) {
+ dev_warn(dev, "hmc6352 : i2c cmd 0x41 failed\n");
+ return ret;
+ }
+ msleep(10); /* sending 0x41 cmd we need to wait for 7-10 milli second*/
+ ret = i2c_transfer(client->adapter, msg1, 1);
+ if (ret != 1) {
+ dev_warn(dev, "hmc6352 : i2c read data cmd failed\n");
+ return ret;
+ }
+ ret_val = i2c_data[0];
+ ret_val = ((ret_val << 8) | i2c_data[1]);
+ return sprintf(buf, "%d.%d\n", ret_val/10, ret_val%10);
+}
+
+static ssize_t compass_power_mode_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ unsigned int ret;
+ static char cmd[] = { 0x53 };
+ static char cmd1[] = { 0x57 };
+ struct i2c_msg msg[] = {
+ { client->addr, 0, 1, cmd },
+ };
+ struct i2c_msg msg1[] = {
+ { client->addr, 0, 1, cmd1 },
+ };
+
+ if (strict_strtoul(buf, 10, &val))
+ return -EINVAL;
+
+ if (val == 0) {
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret != 1)
+ dev_warn(dev, "hmc6352: i2c cmd sleep mode failed\n");
+ } else if (val == 1) {
+ ret = i2c_transfer(client->adapter, msg1, 1);
+ if (ret != 1)
+ dev_warn(dev, "hmc6352: i2c cmd active mode failed\n");
+ } else
+ return -EINVAL;
+
+ return count;
+}
+
+static DEVICE_ATTR(heading, S_IRUGO, compass_heading_data_show, NULL);
+static DEVICE_ATTR(calibration, S_IWUSR, NULL, compass_calibration_store);
+static DEVICE_ATTR(power_state, S_IWUSR, NULL, compass_power_mode_store);
+
+static struct attribute *mid_att_compass[] = {
+ &dev_attr_heading.attr,
+ &dev_attr_calibration.attr,
+ &dev_attr_power_state.attr,
+ NULL
+};
+
+static struct attribute_group m_compass_gr = {
+ .name = "hmc6352",
+ .attrs = mid_att_compass
+};
+
+static int hmc6352_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int res;
+ struct compass_data *data;
+
+ data = kzalloc(sizeof(struct compass_data), GFP_KERNEL);
+ if (data == NULL) {
+ dev_err(&client->dev, "hmc6352: out of memory");
+ return -ENOMEM;
+ }
+ i2c_set_clientdata(client, data);
+
+ res = sysfs_create_group(&client->dev.kobj, &m_compass_gr);
+ if (res) {
+ dev_err(&client->dev, "hmc6352: device_create_file failed\n");
+ goto compass_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;
+ dev_err(&client->dev, "hmc6352: fail to register hwmon device\n");
+ sysfs_remove_group(&client->dev.kobj, &m_compass_gr);
+ goto compass_error1;
+ }
+ dev_info(&client->dev, "%s HMC6352 compass chip found\n",
+ client->name);
+ return res;
+
+compass_error1:
+ i2c_set_clientdata(client, NULL);
+ kfree(data);
+ return res;
+}
+
+static int hmc6352_remove(struct i2c_client *client)
+{
+ struct compass_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &m_compass_gr);
+ kfree(data);
+ return 0;
+}
+
+static struct i2c_device_id hmc6352_id[] = {
+ { "i2c_compass", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, hmc6352_id);
+
+static struct i2c_driver hmc6352_driver = {
+ .driver = {
+ .name = "hmc6352",
+ },
+ .probe = hmc6352_probe,
+ .remove = hmc6352_remove,
+ .id_table = hmc6352_id,
+};
+
+static int __init sensor_hmc6352_init(void)
+{
+ return i2c_add_driver(&hmc6352_driver);
+}
+
+static void __exit sensor_hmc6352_exit(void)
+{
+ i2c_del_driver(&hmc6352_driver);
+}
+
+module_init(sensor_hmc6352_init);
+module_exit(sensor_hmc6352_exit);
+
+MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@xxxxxxxxx");
+MODULE_DESCRIPTION("hmc6352 Compass Driver");
+MODULE_LICENSE("GPL v2");
--
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