Signed-off-by: Albert Zhang
Signed-off-by: Eric Andersson
---
drivers/input/misc/Kconfig | 10 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/bma150.c | 554 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 565 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/misc/bma150.c
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 45dc6aa..9da47fd 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -478,4 +478,14 @@ config INPUT_XEN_KBDDEV_FRONTEND
To compile this driver as a module, choose M here: the
module will be called xen-kbdfront.
+config INPUT_BMA150
+ tristate "BMA150 acceleration sensor support"
+ depends on I2C
+ help
+ Say Y here if you have Bosch Sensortec's BMA150 acceleration
+ sensor hooked to an I2C bus.
+
+ To compile this driver as a module, choose M here: the
+ module will be called bma150.
+
endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 38efb2c..9b13e0e 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -45,4 +45,5 @@ obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o
obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND) += xen-kbdfront.o
obj-$(CONFIG_INPUT_YEALINK) += yealink.o
+obj-$(CONFIG_INPUT_BMA150) += bma150.o
diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
new file mode 100644
index 0000000..1a176b2
--- /dev/null
+++ b/drivers/input/misc/bma150.c
@@ -0,0 +1,554 @@
+/*
+ * Copyright (c) 2011 Bosch Sensortec GmbH
+ * Copyright (c) 2011 Unixphere
+ *
+ * This driver adds support for Bosch Sensortec's digital acceleration
+ * sensor BMA150.
+ * The datasheet for the chip can be found here:
+ * http://www.bosch-sensortec.com/content/language1/downloads/BST-BMA150-DS000-07.pdf
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#define SENSOR_NAME "bma150"
+#define ABSMAX_ACC_VAL 0x01FF
+#define ABSMIN_ACC_VAL -(ABSMAX_ACC_VAL)
+
+#define BMA150_MAX_DELAY 200
+#define BMA150_RANGE_2G 0
+#define BMA150_RANGE_8G 2
+#define BMA150_BW_50HZ 1
+#define BMA150_BW_1500HZ 6
+
+#define BMA150_MODE_NORMAL 0
+#define BMA150_MODE_SLEEP 2
+#define BMA150_MODE_WAKE_UP 3
+
+#define BMA150_CHIP_ID 2
+#define BMA150_CHIP_ID_REG 0x00
+
+#define BMA150_ACC_X_LSB_REG 0x02
+
+#define BMA150_SLEEP_POS 0
+#define BMA150_SLEEP_MSK 0x01
+#define BMA150_SLEEP_REG 0x0a
+
+#define BMA150_BANDWIDTH_POS 0
+#define BMA150_BANDWIDTH_MSK 0x07
+#define BMA150_BANDWIDTH_REG 0x14
+
+#define BMA150_RANGE_POS 3
+#define BMA150_RANGE_MSK 0x18
+#define BMA150_RANGE_REG 0x14
+
+#define BMA150_WAKE_UP_POS 0
+#define BMA150_WAKE_UP_MSK 0x01
+#define BMA150_WAKE_UP_REG 0x15
+
+struct bma150acc {
+ s16 x,
+ y,
+ z;
+};
+
+struct bma150_data {
+ struct i2c_client *bma150_client;
+ atomic_t delay;
+ unsigned char mode;
+ struct input_dev *input;
+ struct bma150acc value;
+ struct mutex mutex;
+ struct delayed_work work;
+};
+
+static int bma150_set_mode(struct i2c_client *client, unsigned char mode)
+{
+ int ret;
+ unsigned char data1, data2;
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ if ((mode != BMA150_MODE_NORMAL) &&
+ (mode != BMA150_MODE_SLEEP) &&
+ (mode != BMA150_MODE_WAKE_UP))
+ return -EINVAL;
+
+ data1 = i2c_smbus_read_byte_data(client, BMA150_WAKE_UP_REG);
+ if (data1 < 0)
+ return ret;
+
+ data1 = (data1 & ~BMA150_WAKE_UP_MSK) |
+ ((mode << BMA150_WAKE_UP_POS) & BMA150_WAKE_UP_MSK);
+
+ data2 = i2c_smbus_read_byte_data(client, BMA150_SLEEP_REG);
+ if (data2 < 0)
+ return ret;
+
+ data2 = (data2 & ~BMA150_SLEEP_MSK) |
+ (((mode>>1) << BMA150_SLEEP_POS) & BMA150_SLEEP_MSK);
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_WAKE_UP_REG, data1);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_SLEEP_REG, data2);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&bma150->mutex);
+ bma150->mode = (unsigned char) mode;
+ mutex_unlock(&bma150->mutex);
+ return 0;
+}
+
+
+static int bma150_set_range(struct i2c_client *client, unsigned char range)
+{
+ int ret;
+ unsigned char data;
+
+ if (range > BMA150_RANGE_8G)
+ return -EINVAL;
+
+ data = i2c_smbus_read_byte_data(client, BMA150_RANGE_REG);
+ if (data < 0)
+ return ret;
+
+ data = (data & ~BMA150_RANGE_MSK) |
+ ((range << BMA150_RANGE_POS) & BMA150_RANGE_MSK);
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_RANGE_REG, data);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int bma150_get_range(struct i2c_client *client, unsigned char *range)
+{
+ int ret;
+ unsigned char data;
+
+ data = i2c_smbus_read_byte_data(client, BMA150_RANGE_REG);
+ if (data < 0)
+ return ret;
+
+ *range = (data & BMA150_RANGE_MSK) >> BMA150_RANGE_POS;
+ return 0;
+}
+
+static int bma150_set_bandwidth(struct i2c_client *client, unsigned char bw)
+{
+ int ret;
+ unsigned char data;
+
+ if (bw > BMA150_BW_1500HZ)
+ return -EINVAL;
+
+ data = i2c_smbus_read_byte_data(client, BMA150_BANDWIDTH_REG);
+ if (data < 0)
+ return ret;
+
+ data = (data & ~BMA150_BANDWIDTH_MSK) |
+ ((bw << BMA150_BANDWIDTH_POS) & BMA150_BANDWIDTH_MSK);
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_BANDWIDTH_REG, data);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int bma150_get_bandwidth(struct i2c_client *client, unsigned char *bw)
+{
+ int ret;
+ unsigned char data;
+
+ data = i2c_smbus_read_byte_data(client, BMA150_BANDWIDTH_REG);
+ if (data < 0)
+ return ret;
+
+ *bw = (data & BMA150_BANDWIDTH_MSK) >> BMA150_BANDWIDTH_POS;
+ return 0;
+}
+
+static int bma150_read_accel_xyz(struct i2c_client *client,
+ struct bma150acc *acc)
+{
+ unsigned char data[6];
+ int ret = i2c_smbus_read_i2c_block_data(client,
+ BMA150_ACC_X_LSB_REG, 6, data);
+ if (ret != 6)
+ return -EIO;
+
+ acc->x = ((0xC0 & data[0]) >> 6) | (data[1] << 2);
+ acc->y = ((0xC0 & data[2]) >> 6) | (data[3] << 2);
+ acc->z = ((0xC0 & data[4]) >> 6) | (data[5] << 2);
+
+ /* sign extension */
+ acc->x = (s16) (acc->x << 6) >> 6;
+ acc->y = (s16) (acc->y << 6) >> 6;
+ acc->z = (s16) (acc->z << 6) >> 6;
+
+ return 0;
+}
+
+static void bma150_work_func(struct work_struct *work)
+{
+ int ret;
+ struct bma150_data *bma150 = container_of((struct delayed_work *)work,
+ struct bma150_data, work);
+ struct bma150acc acc;
+ unsigned long delay = msecs_to_jiffies(atomic_read(&bma150->delay));
+
+ ret = bma150_read_accel_xyz(bma150->bma150_client, &acc);
+ if (ret < 0)
+ return;
+
+ input_report_abs(bma150->input, ABS_X, acc.x);
+ input_report_abs(bma150->input, ABS_Y, acc.y);
+ input_report_abs(bma150->input, ABS_Z, acc.z);
+ input_sync(bma150->input);
+
+ mutex_lock(&bma150->mutex);
+ bma150->value = acc;
+ mutex_unlock(&bma150->mutex);
+
+ schedule_delayed_work(&bma150->work, delay);
+}
+
+static ssize_t bma150_mode_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ return sprintf(buf, "%d\n", bma150->mode);
+}
+
+static ssize_t bma150_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long data;
+ int error;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ error = strict_strtoul(buf, 10, &data);
+ if (error)
+ return error;
+
+ if (bma150_set_mode(bma150->bma150_client, (unsigned char) data) < 0)
+ return -EINVAL;
+
+ return count;
+}
+static ssize_t bma150_range_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned char data;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ if (bma150_get_range(bma150->bma150_client, &data) < 0)
+ return sprintf(buf, "Read error\n");
+
+ return sprintf(buf, "%d\n", data);
+}
+
+static ssize_t bma150_range_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long data;
+ int error;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ error = strict_strtoul(buf, 10, &data);
+ if (error)
+ return error;
+ if (bma150_set_range(bma150->bma150_client, (unsigned char) data) < 0)
+ return -EINVAL;
+
+ return count;
+}
+
+static ssize_t bma150_bandwidth_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned char data;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ if (bma150_get_bandwidth(bma150->bma150_client, &data) < 0)
+ return sprintf(buf, "Read error\n");
+
+ return sprintf(buf, "%d\n", data);
+
+}
+
+static ssize_t bma150_bandwidth_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long data;
+ int error;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ error = strict_strtoul(buf, 10, &data);
+ if (error)
+ return error;
+
+ if (bma150_set_bandwidth(bma150->bma150_client,
+ (unsigned char) data) < 0)
+ return -EINVAL;
+
+ return count;
+}
+
+static ssize_t bma150_value_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct input_dev *input = to_input_dev(dev);
+ struct bma150_data *bma150 = input_get_drvdata(input);
+
+ return sprintf(buf, "%d %d %d\n", bma150->value.x, bma150->value.y,
+ bma150->value.z);
+}
+
+static ssize_t bma150_delay_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ return sprintf(buf, "%d\n", atomic_read(&bma150->delay));
+
+}
+
+static ssize_t bma150_delay_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long data;
+ int error;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ error = strict_strtoul(buf, 10, &data);
+ if (error)
+ return error;
+
+ if (data > BMA150_MAX_DELAY)
+ data = BMA150_MAX_DELAY;
+
+ atomic_set(&bma150->delay, (unsigned int) data);
+
+ return count;
+}
+
+static DEVICE_ATTR(range, S_IRUGO|S_IWUSR|S_IWGRP,
+ bma150_range_show, bma150_range_store);
+static DEVICE_ATTR(bandwidth, S_IRUGO|S_IWUSR|S_IWGRP,
+ bma150_bandwidth_show, bma150_bandwidth_store);
+static DEVICE_ATTR(mode, S_IRUGO|S_IWUSR|S_IWGRP,
+ bma150_mode_show, bma150_mode_store);
+static DEVICE_ATTR(value, S_IRUGO, bma150_value_show, NULL);
+static DEVICE_ATTR(delay, S_IRUGO|S_IWUSR|S_IWGRP,
+ bma150_delay_show, bma150_delay_store);
+
+static struct attribute *bma150_attributes[] = {
+ &dev_attr_range.attr,
+ &dev_attr_bandwidth.attr,
+ &dev_attr_mode.attr,
+ &dev_attr_value.attr,
+ &dev_attr_delay.attr,
+ NULL
+};
+
+static struct attribute_group bma150_attribute_group = {
+ .attrs = bma150_attributes
+};
+
+static int bma150_open(struct input_dev *inputdev)
+{
+ struct bma150_data *dev = input_get_drvdata(inputdev);
+ int ret = bma150_set_mode(dev->bma150_client, BMA150_MODE_NORMAL);
+ if (ret < 0)
+ return ret;
+ schedule_delayed_work(&dev->work,
+ msecs_to_jiffies(atomic_read(&dev->delay)));
+ return 0;
+}
+
+static void bma150_close(struct input_dev *inputdev)
+{
+ struct bma150_data *dev = input_get_drvdata(inputdev);
+ cancel_delayed_work_sync(&dev->work);
+ bma150_set_mode(dev->bma150_client, BMA150_MODE_SLEEP);
+}
+
+static int __devinit bma150_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bma150_data *data;
+ struct input_dev *dev;
+ int tempvalue;
+ int err = 0;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "i2c_check_functionality error\n");
+ return -EIO;
+ }
+
+ data = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ tempvalue = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
+ if (tempvalue != BMA150_CHIP_ID) {
+ dev_err(&client->dev, "BMA150 chip id error: %d\n", tempvalue);
+ err = -EINVAL;
+ goto kfree_exit;
+ }
+ i2c_set_clientdata(client, data);
+ data->bma150_client = client;
+
+ bma150_set_bandwidth(client, BMA150_BW_50HZ);
+ bma150_set_range(client, BMA150_RANGE_2G);
+
+ INIT_DELAYED_WORK(&data->work, bma150_work_func);
+ atomic_set(&data->delay, BMA150_MAX_DELAY);
+
+ dev = input_allocate_device();
+ if (!dev) {
+ err = -ENOMEM;
+ goto kfree_exit;
+ }
+
+ dev->name = SENSOR_NAME;
+ dev->id.bustype = BUS_I2C;
+ dev->open = bma150_open;
+ dev->close = bma150_close;
+
+ input_set_capability(dev, EV_ABS, ABS_MISC);
+ input_set_abs_params(dev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+ input_set_abs_params(dev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+ input_set_abs_params(dev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+ input_set_drvdata(dev, data);
+
+ err = input_register_device(dev);
+ if (err < 0) {
+ input_free_device(dev);
+ goto kfree_exit;
+ }
+
+ data->input = dev;
+
+ err = sysfs_create_group(&data->input->dev.kobj,
+ &bma150_attribute_group);
+ if (err < 0)
+ goto error_sysfs;
+
+ mutex_init(&data->mutex);
+
+ schedule_delayed_work(&data->work,
+ msecs_to_jiffies(atomic_read(&data->delay)));
+
+ dev_info(&client->dev, "Registered BMA150 I2C driver\n");
+ return 0;
+
+error_sysfs:
+ input_unregister_device(dev);
+kfree_exit:
+ kfree(data);
+ return err;
+}
+
+#ifdef CONFIG_PM
+static int bma150_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return bma150_set_mode(client, BMA150_MODE_SLEEP);
+}
+
+static int bma150_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ return bma150_set_mode(client, BMA150_MODE_NORMAL);
+}
+#endif
+
+static int bma150_remove(struct i2c_client *client)
+{
+ struct bma150_data *data = i2c_get_clientdata(client);
+
+ sysfs_remove_group(&data->input->dev.kobj, &bma150_attribute_group);
+ input_unregister_device(data->input);
+ kfree(data);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(bma150_pm, bma150_suspend,
+ bma150_resume);
+
+static const struct i2c_device_id bma150_id[] = {
+ { SENSOR_NAME, 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, bma150_id);
+
+static struct i2c_driver bma150_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = SENSOR_NAME,
+ .pm = &bma150_pm,
+ },
+ .class = I2C_CLASS_HWMON,
+ .id_table = bma150_id,
+ .probe = bma150_probe,
+ .remove = __devexit_p(bma150_remove),
+};
+
+static int __init BMA150_init(void)
+{
+ return i2c_add_driver(&bma150_driver);
+}
+
+static void __exit BMA150_exit(void)
+{
+ i2c_del_driver(&bma150_driver);
+}
+
+MODULE_AUTHOR("Albert Zhang ");
+MODULE_DESCRIPTION("BMA150 driver");
+MODULE_LICENSE("GPL");
+
+module_init(BMA150_init);
+module_exit(BMA150_exit);
+
--
1.7.3.4
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