Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / misc / hmc6352.c

diff --git a/kernel/drivers/misc/hmc6352.c b/kernel/drivers/misc/hmc6352.c
new file mode 100644 (file)
index 0000000..90520d7
--- /dev/null
+++ b/kernel/drivers/misc/hmc6352.c
@@ -0,0 +1,155 @@
+/*
+ * 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/slab.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/sysfs.h>
+
+static DEFINE_MUTEX(compass_mutex);
+
+static int compass_command(struct i2c_client *c, u8 cmd)
+{
+       int ret = i2c_master_send(c, &cmd, 1);
+       if (ret < 0)
+               dev_warn(&c->dev, "command '%c' failed.\n", cmd);
+       return ret;
+}
+
+static int compass_store(struct device *dev, const char *buf, size_t count,
+                       const char *map)
+{
+       struct i2c_client *c = to_i2c_client(dev);
+       int ret;
+       unsigned long val;
+
+       ret = kstrtoul(buf, 10, &val);
+       if (ret)
+               return ret;
+       if (val >= strlen(map))
+               return -EINVAL;
+       mutex_lock(&compass_mutex);
+       ret = compass_command(c, map[val]);
+       mutex_unlock(&compass_mutex);
+       if (ret < 0)
+               return ret;
+       return count;
+}
+
+static ssize_t compass_calibration_store(struct device *dev,
+               struct device_attribute *attr, const char *buf, size_t count)
+{
+       return compass_store(dev, buf, count, "EC");
+}
+
+static ssize_t compass_power_mode_store(struct device *dev,
+               struct device_attribute *attr, const  char *buf, size_t count)
+{
+       return compass_store(dev, buf, count, "SW");
+}
+
+static ssize_t compass_heading_data_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       unsigned char i2c_data[2];
+       int ret;
+
+       mutex_lock(&compass_mutex);
+       ret = compass_command(client, 'A');
+       if (ret != 1) {
+               mutex_unlock(&compass_mutex);
+               return ret;
+       }
+       msleep(10); /* sending 'A' cmd we need to wait for 7-10 millisecs */
+       ret = i2c_master_recv(client, i2c_data, 2);
+       mutex_unlock(&compass_mutex);
+       if (ret < 0) {
+               dev_warn(dev, "i2c read data cmd failed\n");
+               return ret;
+       }
+       ret = (i2c_data[0] << 8) | i2c_data[1];
+       return sprintf(buf, "%d.%d\n", ret/10, ret%10);
+}
+
+
+static DEVICE_ATTR(heading0_input, 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_heading0_input.attr,
+       &dev_attr_calibration.attr,
+       &dev_attr_power_state.attr,
+       NULL
+};
+
+static const 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;
+
+       res = sysfs_create_group(&client->dev.kobj, &m_compass_gr);
+       if (res) {
+               dev_err(&client->dev, "device_create_file failed\n");
+               return res;
+       }
+       dev_info(&client->dev, "%s HMC6352 compass chip found\n",
+                                                       client->name);
+       return 0;
+}
+
+static int hmc6352_remove(struct i2c_client *client)
+{
+       sysfs_remove_group(&client->dev.kobj, &m_compass_gr);
+       return 0;
+}
+
+static struct i2c_device_id hmc6352_id[] = {
+       { "hmc6352", 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,
+};
+
+module_i2c_driver(hmc6352_driver);
+
+MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
+MODULE_DESCRIPTION("hmc6352 Compass Driver");
+MODULE_LICENSE("GPL v2");