--- /dev/null
+/*
+ *
+ * Copyright (C) 2011-2012 Freescale Semiconductor, Inc.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/input-polldev.h>
+#include <linux/hwmon.h>
+#include <linux/input.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#define MAG3110_DRV_NAME "mag3110"
+#define MAG3110_ID 0xC4
+#define MAG3110_XYZ_DATA_LEN 6
+#define MAG3110_STATUS_ZYXDR 0x08
+
+#define MAG3110_AC_MASK (0x01)
+#define MAG3110_AC_OFFSET 0
+#define MAG3110_DR_MODE_MASK (0x7 << 5)
+#define MAG3110_DR_MODE_OFFSET 5
+#define MAG3110_IRQ_USED 0
+
+#define POLL_INTERVAL_MAX 500
+#define POLL_INTERVAL 100
+#define INT_TIMEOUT 1000
+/* register enum for mag3110 registers */
+enum {
+ MAG3110_DR_STATUS = 0x00,
+ MAG3110_OUT_X_MSB,
+ MAG3110_OUT_X_LSB,
+ MAG3110_OUT_Y_MSB,
+ MAG3110_OUT_Y_LSB,
+ MAG3110_OUT_Z_MSB,
+ MAG3110_OUT_Z_LSB,
+ MAG3110_WHO_AM_I,
+
+ MAG3110_OFF_X_MSB,
+ MAG3110_OFF_X_LSB,
+ MAG3110_OFF_Y_MSB,
+ MAG3110_OFF_Y_LSB,
+ MAG3110_OFF_Z_MSB,
+ MAG3110_OFF_Z_LSB,
+
+ MAG3110_DIE_TEMP,
+
+ MAG3110_CTRL_REG1 = 0x10,
+ MAG3110_CTRL_REG2,
+};
+enum {
+ MAG_STANDBY,
+ MAG_ACTIVED
+};
+struct mag3110_data {
+ struct i2c_client *client;
+ struct input_polled_dev *poll_dev;
+ struct device *hwmon_dev;
+ wait_queue_head_t waitq;
+ bool data_ready;
+ u8 ctl_reg1;
+ int active;
+ int position;
+};
+static short MAGHAL[8][3][3] = {
+ { {0, 1, 0}, {-1, 0, 0}, {0, 0, 1} },
+ { {1, 0, 0}, {0, 1, 0}, {0, 0, 1} },
+ { {0, -1, 0}, {1, 0, 0}, {0, 0, 1} },
+ { {-1, 0, 0}, {0, -1, 0}, {0, 0, 1} },
+
+ { {0, 1, 0}, {1, 0, 0}, {0, 0, -1} },
+ { {1, 0, 0}, {0, -1, 0}, {0, 0, -1} },
+ { {0, -1, 0}, {-1, 0, 0}, {0, 0, -1} },
+ { {-1, 0, 0}, {0, 1, 0}, {0, 0, -1} },
+};
+
+static struct mag3110_data *mag3110_pdata;
+/*!
+ * This function do one mag3110 register read.
+ */
+static DEFINE_MUTEX(mag3110_lock);
+static int mag3110_adjust_position(short *x, short *y, short *z)
+{
+ short rawdata[3], data[3];
+ int i, j;
+ int position = mag3110_pdata->position;
+ if (position < 0 || position > 7)
+ position = 0;
+ rawdata[0] = *x;
+ rawdata[1] = *y;
+ rawdata[2] = *z;
+ for (i = 0; i < 3; i++) {
+ data[i] = 0;
+ for (j = 0; j < 3; j++)
+ data[i] += rawdata[j] * MAGHAL[position][i][j];
+ }
+ *x = data[0];
+ *y = data[1];
+ *z = data[2];
+ return 0;
+}
+
+static int mag3110_read_reg(struct i2c_client *client, u8 reg)
+{
+ return i2c_smbus_read_byte_data(client, reg);
+}
+
+/*!
+ * This function do one mag3110 register write.
+ */
+static int mag3110_write_reg(struct i2c_client *client, u8 reg, char value)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+ if (ret < 0)
+ dev_err(&client->dev, "i2c write failed\n");
+ return ret;
+}
+
+/*!
+ * This function do multiple mag3110 registers read.
+ */
+static int mag3110_read_block_data(struct i2c_client *client, u8 reg,
+ int count, u8 *addr)
+{
+ if (i2c_smbus_read_i2c_block_data(client, reg, count, addr) < count) {
+ dev_err(&client->dev, "i2c block read failed\n");
+ return -1;
+ }
+
+ return count;
+}
+
+/*
+ * Initialization function
+ */
+static int mag3110_init_client(struct i2c_client *client)
+{
+ int val, ret;
+
+ /* enable automatic resets */
+ val = 0x80;
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG2, val);
+
+ /* set default data rate to 10HZ */
+ val = mag3110_read_reg(client, MAG3110_CTRL_REG1);
+ val |= (0x0 << MAG3110_DR_MODE_OFFSET);
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG1, val);
+
+ return ret;
+}
+
+/***************************************************************
+*
+* read sensor data from mag3110
+*
+***************************************************************/
+static int mag3110_read_data(short *x, short *y, short *z)
+{
+ struct mag3110_data *data;
+ int retry = 3;
+ u8 tmp_data[MAG3110_XYZ_DATA_LEN];
+ int result;
+ if (!mag3110_pdata || mag3110_pdata->active == MAG_STANDBY)
+ return -EINVAL;
+
+ data = mag3110_pdata;
+#if MAG3110_IRQ_USED
+ if (!wait_event_interruptible_timeout
+ (data->waitq, data->data_ready != 0,
+ msecs_to_jiffies(INT_TIMEOUT))) {
+ dev_dbg(&data->client->dev, "interrupt not received\n");
+ return -ETIME;
+ }
+#else
+ do {
+ msleep(1);
+ result = i2c_smbus_read_byte_data(data->client,
+ MAG3110_DR_STATUS);
+ retry--;
+ } while (!(result & MAG3110_STATUS_ZYXDR) && retry > 0);
+ /* Clear data_ready flag after data is read out */
+ if (retry == 0) {
+ return -EINVAL;
+ }
+#endif
+
+ data->data_ready = 0;
+
+ if (mag3110_read_block_data(data->client,
+ MAG3110_OUT_X_MSB, MAG3110_XYZ_DATA_LEN,
+ tmp_data) < 0)
+ return -1;
+
+ *x = ((tmp_data[0] << 8) & 0xff00) | tmp_data[1];
+ *y = ((tmp_data[2] << 8) & 0xff00) | tmp_data[3];
+ *z = ((tmp_data[4] << 8) & 0xff00) | tmp_data[5];
+
+ return 0;
+}
+
+static void report_abs(void)
+{
+ struct input_dev *idev;
+ short x, y, z;
+
+ mutex_lock(&mag3110_lock);
+ if (mag3110_read_data(&x, &y, &z) != 0)
+ goto out;
+ mag3110_adjust_position(&x, &y, &z);
+ idev = mag3110_pdata->poll_dev->input;
+ input_report_abs(idev, ABS_X, x);
+ input_report_abs(idev, ABS_Y, y);
+ input_report_abs(idev, ABS_Z, z);
+ input_sync(idev);
+out:
+ mutex_unlock(&mag3110_lock);
+}
+
+static void mag3110_dev_poll(struct input_polled_dev *dev)
+{
+ report_abs();
+}
+
+#if MAG3110_IRQ_USED
+static irqreturn_t mag3110_irq_handler(int irq, void *dev_id)
+{
+ mag3110_pdata->data_ready = 1;
+ wake_up_interruptible(&mag3110_pdata->waitq);
+
+ return IRQ_HANDLED;
+}
+#endif
+static ssize_t mag3110_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client;
+ int val;
+ mutex_lock(&mag3110_lock);
+ client = mag3110_pdata->client;
+ val = mag3110_read_reg(client, MAG3110_CTRL_REG1) & MAG3110_AC_MASK;
+
+ mutex_unlock(&mag3110_lock);
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t mag3110_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client;
+ int reg, ret, enable;
+ u8 tmp_data[MAG3110_XYZ_DATA_LEN];
+
+ enable = simple_strtoul(buf, NULL, 10);
+ mutex_lock(&mag3110_lock);
+ client = mag3110_pdata->client;
+ reg = mag3110_read_reg(client, MAG3110_CTRL_REG1);
+ if (enable && mag3110_pdata->active == MAG_STANDBY) {
+ reg |= MAG3110_AC_MASK;
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG1, reg);
+ if (!ret)
+ mag3110_pdata->active = MAG_ACTIVED;
+ } else if (!enable && mag3110_pdata->active == MAG_ACTIVED) {
+ reg &= ~MAG3110_AC_MASK;
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG1, reg);
+ if (!ret)
+ mag3110_pdata->active = MAG_STANDBY;
+ }
+
+ if (mag3110_pdata->active == MAG_ACTIVED) {
+ msleep(100);
+ /* Read out MSB data to clear interrupt flag automatically */
+ mag3110_read_block_data(client, MAG3110_OUT_X_MSB,
+ MAG3110_XYZ_DATA_LEN, tmp_data);
+ }
+ mutex_unlock(&mag3110_lock);
+ return count;
+}
+
+static DEVICE_ATTR(enable, S_IWUSR | S_IRUGO,
+ mag3110_enable_show, mag3110_enable_store);
+
+static ssize_t mag3110_dr_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client;
+ int val;
+
+ client = mag3110_pdata->client;
+ val = (mag3110_read_reg(client, MAG3110_CTRL_REG1)
+ & MAG3110_DR_MODE_MASK) >> MAG3110_DR_MODE_OFFSET;
+
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t mag3110_dr_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client;
+ int reg, ret;
+ unsigned long val;
+
+ /* This must be done when mag3110 is disabled */
+ if ((strict_strtoul(buf, 10, &val) < 0) || (val > 7))
+ return -EINVAL;
+
+ client = mag3110_pdata->client;
+ reg = mag3110_read_reg(client, MAG3110_CTRL_REG1) &
+ ~MAG3110_DR_MODE_MASK;
+ reg |= (val << MAG3110_DR_MODE_OFFSET);
+ /* MAG3110_CTRL_REG1 bit 5-7: data rate mode */
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG1, reg);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(dr_mode, S_IWUSR | S_IRUGO,
+ mag3110_dr_mode_show, mag3110_dr_mode_store);
+
+static ssize_t mag3110_position_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int val;
+ mutex_lock(&mag3110_lock);
+ val = mag3110_pdata->position;
+ mutex_unlock(&mag3110_lock);
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t mag3110_position_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int position;
+ position = simple_strtoul(buf, NULL, 10);
+ mutex_lock(&mag3110_lock);
+ mag3110_pdata->position = position;
+ mutex_unlock(&mag3110_lock);
+ return count;
+}
+
+static DEVICE_ATTR(position, S_IWUSR | S_IRUGO,
+ mag3110_position_show, mag3110_position_store);
+
+static struct attribute *mag3110_attributes[] = {
+ &dev_attr_enable.attr,
+ &dev_attr_dr_mode.attr,
+ &dev_attr_position.attr,
+ NULL
+};
+
+static const struct attribute_group mag3110_attr_group = {
+ .attrs = mag3110_attributes,
+};
+
+static int __devinit mag3110_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter;
+ struct input_dev *idev;
+ struct mag3110_data *data;
+ int ret = 0;
+
+ adapter = to_i2c_adapter(client->dev.parent);
+ if (!i2c_check_functionality(adapter,
+ I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK))
+ return -EIO;
+
+ dev_info(&client->dev, "check mag3110 chip ID\n");
+ ret = mag3110_read_reg(client, MAG3110_WHO_AM_I);
+
+ if (MAG3110_ID != ret) {
+ dev_err(&client->dev,
+ "read chip ID 0x%x is not equal to 0x%x!\n", ret,
+ MAG3110_ID);
+ return -EINVAL;
+ }
+ data = kzalloc(sizeof(struct mag3110_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+ data->client = client;
+ i2c_set_clientdata(client, data);
+ /* Init queue */
+ init_waitqueue_head(&data->waitq);
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ dev_err(&client->dev, "hwmon register failed!\n");
+ ret = PTR_ERR(data->hwmon_dev);
+ goto error_rm_dev_sysfs;
+ }
+
+ /*input poll device register */
+ data->poll_dev = input_allocate_polled_device();
+ if (!data->poll_dev) {
+ dev_err(&client->dev, "alloc poll device failed!\n");
+ ret = -ENOMEM;
+ goto error_rm_hwmon_dev;
+ }
+ data->poll_dev->poll = mag3110_dev_poll;
+ data->poll_dev->poll_interval = POLL_INTERVAL;
+ data->poll_dev->poll_interval_max = POLL_INTERVAL_MAX;
+ idev = data->poll_dev->input;
+ idev->name = MAG3110_DRV_NAME;
+ idev->id.bustype = BUS_I2C;
+ idev->evbit[0] = BIT_MASK(EV_ABS);
+ input_set_abs_params(idev, ABS_X, -15000, 15000, 0, 0);
+ input_set_abs_params(idev, ABS_Y, -15000, 15000, 0, 0);
+ input_set_abs_params(idev, ABS_Z, -15000, 15000, 0, 0);
+ ret = input_register_polled_device(data->poll_dev);
+ if (ret) {
+ dev_err(&client->dev, "register poll device failed!\n");
+ goto error_free_poll_dev;
+ }
+
+ /*create device group in sysfs as user interface */
+ ret = sysfs_create_group(&idev->dev.kobj, &mag3110_attr_group);
+ if (ret) {
+ dev_err(&client->dev, "create device file failed!\n");
+ ret = -EINVAL;
+ goto error_rm_poll_dev;
+ }
+ /* set irq type to edge rising */
+#if MAG3110_IRQ_USED
+ ret = request_irq(client->irq, mag3110_irq_handler,
+ IRQF_TRIGGER_RISING, client->dev.driver->name, idev);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to register irq %d!\n",
+ client->irq);
+ goto error_rm_dev_sysfs;
+ }
+#endif
+ /* Initialize mag3110 chip */
+ mag3110_init_client(client);
+ mag3110_pdata = data;
+ mag3110_pdata->active = MAG_STANDBY;
+ mag3110_pdata->position = *(int *)client->dev.platform_data;
+ dev_info(&client->dev, "mag3110 is probed\n");
+ return 0;
+error_rm_dev_sysfs:
+ sysfs_remove_group(&client->dev.kobj, &mag3110_attr_group);
+error_rm_poll_dev:
+ input_unregister_polled_device(data->poll_dev);
+error_free_poll_dev:
+ input_free_polled_device(data->poll_dev);
+error_rm_hwmon_dev:
+ hwmon_device_unregister(data->hwmon_dev);
+
+ kfree(data);
+ mag3110_pdata = NULL;
+
+ return ret;
+}
+
+static int __devexit mag3110_remove(struct i2c_client *client)
+{
+ struct mag3110_data *data;
+ int ret;
+
+ data = i2c_get_clientdata(client);
+
+ data->ctl_reg1 = mag3110_read_reg(client, MAG3110_CTRL_REG1);
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG1,
+ data->ctl_reg1 & ~MAG3110_AC_MASK);
+
+ free_irq(client->irq, data);
+ input_unregister_polled_device(data->poll_dev);
+ input_free_polled_device(data->poll_dev);
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &mag3110_attr_group);
+ kfree(data);
+ mag3110_pdata = NULL;
+
+ return ret;
+}
+
+#ifdef CONFIG_PM
+static int mag3110_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ int ret = 0;
+ struct mag3110_data *data = i2c_get_clientdata(client);
+ if (data->active == MAG_ACTIVED) {
+ data->ctl_reg1 = mag3110_read_reg(client, MAG3110_CTRL_REG1);
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG1,
+ data->ctl_reg1 & ~MAG3110_AC_MASK);
+ }
+ return ret;
+}
+
+static int mag3110_resume(struct i2c_client *client)
+{
+ int ret = 0;
+ u8 tmp_data[MAG3110_XYZ_DATA_LEN];
+ struct mag3110_data *data = i2c_get_clientdata(client);
+ if (data->active == MAG_ACTIVED) {
+ ret = mag3110_write_reg(client, MAG3110_CTRL_REG1,
+ data->ctl_reg1);
+
+ if (data->ctl_reg1 & MAG3110_AC_MASK) {
+ /* Read out MSB data to clear interrupt flag automatically */
+ mag3110_read_block_data(client, MAG3110_OUT_X_MSB,
+ MAG3110_XYZ_DATA_LEN, tmp_data);
+ }
+ }
+ return ret;
+}
+
+#else
+#define mag3110_suspend NULL
+#define mag3110_resume NULL
+#endif /* CONFIG_PM */
+
+static const struct i2c_device_id mag3110_id[] = {
+ {MAG3110_DRV_NAME, 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, mag3110_id);
+static struct i2c_driver mag3110_driver = {
+ .driver = {.name = MAG3110_DRV_NAME,
+ .owner = THIS_MODULE,},
+ .suspend = mag3110_suspend,
+ .resume = mag3110_resume,
+ .probe = mag3110_probe,
+ .remove = __devexit_p(mag3110_remove),
+ .id_table = mag3110_id,
+};
+
+static int __init mag3110_init(void)
+{
+ return i2c_add_driver(&mag3110_driver);
+}
+
+static void __exit mag3110_exit(void)
+{
+ i2c_del_driver(&mag3110_driver);
+}
+
+module_init(mag3110_init);
+module_exit(mag3110_exit);
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Freescale mag3110 3-axis magnetometer driver");
+MODULE_LICENSE("GPL");
projects / karo-tx-linux.git / commitdiff