@@ -0,0 +1,577 @@
+/*
+ * Copyright (c) 2011 Bosch Sensortec GmbH
+ * Copyright (c) 2011 Unixphere
+ *
+ * This driver adds support for Bosch Sensortec's digital acceleration
+ * sensors BMA150 and SMB380.
+ * The SMB380 is fully compatible with BMA150 and only differs in packaging.
+ *
+ * The datasheet for the BMA150 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input-polldev.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+
+#define DRIVER_NAME "bma150"
+#define ABSMAX_ACC_VAL 0x01FF
+#define ABSMIN_ACC_VAL -(ABSMAX_ACC_VAL)
+/* Input poll interval in milliseconds */
+#define BMA150_POLL_INTERVAL 10
+#define BMA150_POLL_MAX 200
+#define BMA150_POLL_MIN 0
+
+#define BMA150_BW_25HZ 0
+#define BMA150_BW_50HZ 1
+#define BMA150_BW_100HZ 2
+#define BMA150_BW_190HZ 3
+#define BMA150_BW_375HZ 4
+#define BMA150_BW_750HZ 5
+#define BMA150_BW_1500HZ 6
+
+#define BMA150_RANGE_2G 0
+#define BMA150_RANGE_4G 1
+#define BMA150_RANGE_8G 2
+
+#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
+
+#define BMA150_SW_RES_POS 1
+#define BMA150_SW_RES_REG BMA150_SLEEP_REG
+
+struct bma150_data {
+ struct i2c_client *client;
+ struct input_polled_dev *input_polled;
+ struct input_dev *input;
+ struct mutex mutex;
+};
+
+static const struct {
+ int value;
+ int reg;
+} bw_val[] = {
+ { 25, BMA150_BW_25HZ },
+ { 50, BMA150_BW_50HZ },
+ { 100, BMA150_BW_100HZ },
+ { 190, BMA150_BW_190HZ },
+ { 375, BMA150_BW_375HZ },
+ { 750, BMA150_BW_750HZ },
+ { 1500, BMA150_BW_1500HZ }
+};
+
+static const struct {
+ int value;
+ int reg;
+} range_val[] = {
+ { 2, BMA150_RANGE_2G },
+ { 4, BMA150_RANGE_4G },
+ { 8, BMA150_RANGE_8G }
+};
+
+static int bma150_soft_reset(struct i2c_client *client)
+{
+ s32 ret;
+ u8 data;
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ mutex_lock(&bma150->mutex);
+ ret = i2c_smbus_read_byte_data(client, BMA150_SW_RES_REG);
+ if (ret < 0)
+ goto error;
+
+ data = ret | (1 << BMA150_SW_RES_POS);
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_SW_RES_REG, data);
+ msleep(2);
+error:
+ mutex_unlock(&bma150->mutex);
+ return ret;
+}
+
+static int bma150_set_mode(struct i2c_client *client, u8 mode)
+{
+ s32 ret;
+ u8 data1, data2;
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ mutex_lock(&bma150->mutex);
+ ret = i2c_smbus_read_byte_data(client, BMA150_WAKE_UP_REG);
+ if (ret < 0)
+ goto error;
+
+ data1 = (ret & ~BMA150_WAKE_UP_MSK) |
+ ((mode << BMA150_WAKE_UP_POS) & BMA150_WAKE_UP_MSK);
+
+ ret = i2c_smbus_read_byte_data(client, BMA150_SLEEP_REG);
+ if (ret < 0)
+ goto error;
+
+ data2 = (ret & ~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)
+ goto error;
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_SLEEP_REG, data2);
+error:
+ mutex_unlock(&bma150->mutex);
+ return ret;
+}
+
+static int bma150_set_range(struct i2c_client *client, u8 range)
+{
+ s32 ret;
+ u8 data;
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ mutex_lock(&bma150->mutex);
+ ret = i2c_smbus_read_byte_data(client, BMA150_RANGE_REG);
+ if (ret < 0)
+ goto error;
+
+ data = (ret & ~BMA150_RANGE_MSK) |
+ ((range << BMA150_RANGE_POS) & BMA150_RANGE_MSK);
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_RANGE_REG, data);
+error:
+ mutex_unlock(&bma150->mutex);
+ return ret;
+}
+
+static int bma150_get_range(struct i2c_client *client)
+{
+ s32 ret;
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ mutex_lock(&bma150->mutex);
+ ret = i2c_smbus_read_byte_data(client, BMA150_RANGE_REG);
+ if (ret < 0)
+ goto error;
+
+ ret = (ret & BMA150_RANGE_MSK) >> BMA150_RANGE_POS;
+error:
+ mutex_unlock(&bma150->mutex);
+ return ret;
+}
+
+static int bma150_set_bandwidth(struct i2c_client *client, u8 bw)
+{
+ s32 ret;
+ u8 data;
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ mutex_lock(&bma150->mutex);
+ ret = i2c_smbus_read_byte_data(client, BMA150_BANDWIDTH_REG);
+ if (ret < 0)
+ goto error;
+
+ data = (ret & ~BMA150_BANDWIDTH_MSK) |
+ ((bw << BMA150_BANDWIDTH_POS) & BMA150_BANDWIDTH_MSK);
+
+ ret = i2c_smbus_write_byte_data(client, BMA150_BANDWIDTH_REG, data);
+error:
+ mutex_unlock(&bma150->mutex);
+ return ret;
+}
+
+static int bma150_get_bandwidth(struct i2c_client *client)
+{
+ s32 ret;
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ mutex_lock(&bma150->mutex);
+ ret = i2c_smbus_read_byte_data(client, BMA150_BANDWIDTH_REG);
+ if (ret < 0)
+ goto error;
+
+ ret = (ret & BMA150_BANDWIDTH_MSK) >> BMA150_BANDWIDTH_POS;
+error:
+ mutex_unlock(&bma150->mutex);
+ return ret;
+}
+
+static int bma150_initialize(struct i2c_client *client)
+{
+ s32 ret;
+
+ ret = bma150_soft_reset(client);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
+ if (ret != BMA150_CHIP_ID) {
+ dev_err(&client->dev, "BMA150 chip id error: %d\n", ret);
+ return -EINVAL;
+ }
+
+ ret = bma150_set_bandwidth(client, BMA150_BW_50HZ);
+ if (ret < 0)
+ return ret;
+
+ ret = bma150_set_range(client, BMA150_RANGE_2G);
+ if (ret < 0)
+ return ret;
+
+ ret = bma150_set_mode(client, BMA150_MODE_SLEEP);
+ return ret;
+}
+
+static ssize_t bma150_range_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int ret;
+ int i;
+ int range;
+ struct input_polled_dev *ipoll_dev = dev_get_drvdata(dev);
+ struct bma150_data *bma150 = ipoll_dev->private;
+ struct device *bma150_dev = &bma150->client->dev;
+
+ pm_runtime_get_sync(bma150_dev);
+ range = bma150_get_range(bma150->client);
+ pm_runtime_put(bma150_dev);
+
+ if (range < 0)
+ return sprintf(buf, "Read error\n");
+
+ for (i = 0, ret = 0; i < ARRAY_SIZE(range_val); i++)
+ ret += sprintf(buf + ret,
+ (range_val[i].reg == range) ? "[%d] " : "%d ",
+ range_val[i].value);
+
+ ret += sprintf(buf + ret, "\n");
+ return ret;
+}
+
+static ssize_t bma150_range_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long data;
+ int ret;
+ int i;
+ struct input_polled_dev *ipoll_dev = dev_get_drvdata(dev);
+ struct bma150_data *bma150 = ipoll_dev->private;
+ struct device *bma150_dev = &bma150->client->dev;
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(range_val); i++)
+ if (range_val[i].value == data) {
+ pm_runtime_get_sync(bma150_dev);
+ ret = bma150_set_range(bma150->client,
+ range_val[i].reg);
+ pm_runtime_put(bma150_dev);
+ if (ret < 0)
+ return ret;
+ return count;
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t bma150_bandwidth_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int ret;
+ int i;
+ int bw;
+ struct input_polled_dev *ipoll_dev = dev_get_drvdata(dev);
+ struct bma150_data *bma150 = ipoll_dev->private;
+ struct device *bma150_dev = &bma150->client->dev;
+
+ pm_runtime_get_sync(bma150_dev);
+ bw = bma150_get_bandwidth(bma150->client);
+ pm_runtime_put(bma150_dev);
+
+ if (bw < 0)
+ return sprintf(buf, "Read error\n");
+
+ for (i = 0, ret = 0; i < ARRAY_SIZE(bw_val); i++)
+ ret += sprintf(buf + ret,
+ (bw_val[i].reg == bw) ? "[%d] " : "%d ",
+ bw_val[i].value);
+
+ ret += sprintf(buf + ret, "\n");
+ return ret;
+}
+
+static ssize_t bma150_bandwidth_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long data;
+ int ret;
+ int i;
+ struct input_polled_dev *ipoll_dev = dev_get_drvdata(dev);
+ struct bma150_data *bma150 = ipoll_dev->private;
+ struct device *bma150_dev = &bma150->client->dev;
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(bw_val); i++)
+ if (bw_val[i].value == data) {
+ pm_runtime_get_sync(bma150_dev);
+ ret = bma150_set_bandwidth(bma150->client,
+ bw_val[i].reg);
+ pm_runtime_put(bma150_dev);
+ if (ret < 0)
+ return ret;
+ return count;
+ }
+
+ return -EINVAL;
+}
+
+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 struct attribute *bma150_attributes[] = {
+ &dev_attr_range.attr,
+ &dev_attr_bandwidth.attr,
+ NULL
+};
+
+static struct attribute_group bma150_attribute_group = {
+ .attrs = bma150_attributes
+};
+
+static void bma150_open(struct input_polled_dev *ipoll_dev)
+{
+ struct bma150_data *bma150 = ipoll_dev->private;
+ struct device *bma150_dev = &bma150->client->dev;
+
+ pm_runtime_get(bma150_dev);
+}
+
+static void bma150_close(struct input_polled_dev *ipoll_dev)
+{
+ struct bma150_data *bma150 = ipoll_dev->private;
+ struct device *bma150_dev = &bma150->client->dev;
+
+ pm_runtime_put(bma150_dev);
+}
+
+static void bma150_poll(struct input_polled_dev *dev)
+{
+ struct bma150_data *bma150 = dev->private;
+ u8 data[6];
+ s16 x, y, z;
+ s32 ret = i2c_smbus_read_i2c_block_data(bma150->client,
+ BMA150_ACC_X_LSB_REG, 6, data);
+ if (ret != 6)
+ return;
+
+ x = ((0xc0 & data[0]) >> 6) | (data[1] << 2);
+ y = ((0xc0 & data[2]) >> 6) | (data[3] << 2);
+ z = ((0xc0 & data[4]) >> 6) | (data[5] << 2);
+
+ /* sign extension */
+ x = (s16) (x << 6) >> 6;
+ y = (s16) (y << 6) >> 6;
+ z = (s16) (z << 6) >> 6;
+
+ input_report_abs(bma150->input, ABS_X, x);
+ input_report_abs(bma150->input, ABS_Y, y);
+ input_report_abs(bma150->input, ABS_Z, z);
+ input_sync(bma150->input);
+}
+
+static int __devinit bma150_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bma150_data *bma150;
+ struct input_polled_dev *ipoll_dev;
+ struct input_dev *idev;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "i2c_check_functionality error\n");
+ return -EIO;
+ }
+
+ bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
+ if (!bma150)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, bma150);
+ bma150->client = client;
+ mutex_init(&bma150->mutex);
+ ret = bma150_initialize(client);
+ if (ret < 0)
+ goto kfree_exit;
+
+ pm_runtime_set_active(&client->dev);
+
+ ipoll_dev = input_allocate_polled_device();
+ if (!ipoll_dev) {
+ ret = -ENOMEM;
+ goto kfree_exit;
+ }
+ ipoll_dev->private = bma150;
+ ipoll_dev->open = bma150_open;
+ ipoll_dev->close = bma150_close;
+ ipoll_dev->poll = bma150_poll;
+ ipoll_dev->poll_interval = BMA150_POLL_INTERVAL;
+ ipoll_dev->poll_interval_min = BMA150_POLL_MIN;
+ ipoll_dev->poll_interval_max = BMA150_POLL_MAX;
+
+ idev = ipoll_dev->input;
+ idev->name = DRIVER_NAME;
+ idev->phys = DRIVER_NAME "/input0";
+ idev->id.bustype = BUS_I2C;
+ idev->dev.parent = &client->dev;
+
+ input_set_capability(idev, EV_ABS, ABS_MISC);
+ input_set_abs_params(idev, ABS_X, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+ input_set_abs_params(idev, ABS_Y, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+ input_set_abs_params(idev, ABS_Z, ABSMIN_ACC_VAL, ABSMAX_ACC_VAL, 0, 0);
+
+ ret = input_register_polled_device(ipoll_dev);
+ if (ret < 0) {
+ input_free_polled_device(ipoll_dev);
+ goto kfree_exit;
+ }
+
+ bma150->input_polled = ipoll_dev;
+ bma150->input = idev;
+
+ ret = sysfs_create_group(&bma150->input->dev.kobj,
+ &bma150_attribute_group);
+ if (ret < 0)
+ goto error_sysfs;
+
+ pm_runtime_enable(&client->dev);
+
+ dev_info(&client->dev, "Registered BMA150 I2C driver\n");
+ return 0;
+
+error_sysfs:
+ input_unregister_polled_device(ipoll_dev);
+kfree_exit:
+ kfree(bma150);
+ return ret;
+}
+
+#if defined(CONFIG_PM) || defined(CONFIG_PM_RUNTIME)
+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);
+ int ret = bma150_set_mode(client, BMA150_MODE_NORMAL);
+
+ msleep(2);
+ return ret;
+}
+#endif
+
+static int bma150_remove(struct i2c_client *client)
+{
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+
+ sysfs_remove_group(&bma150->input->dev.kobj, &bma150_attribute_group);
+ input_unregister_polled_device(bma150->input_polled);
+ kfree(bma150);
+
+ return 0;
+}
+
+static const struct dev_pm_ops bma150_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(bma150_suspend, bma150_resume)
+ SET_RUNTIME_PM_OPS(bma150_suspend, bma150_resume, NULL)
+};
+
+static const struct i2c_device_id bma150_id[] = {
+ { "bma150", 0 },
+ { "smb380", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, bma150_id);
+
+static struct i2c_driver bma150_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVER_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 <xu.zhang@bosch-sensortec.com>");
+MODULE_DESCRIPTION("BMA150 driver");
+MODULE_LICENSE("GPL");
+
+module_init(BMA150_init);
+module_exit(BMA150_exit);
+