--- /dev/null
+/*
+ * 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/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/bma150.h>
+
+#define ABSMAX_ACC_VAL 0x01FF
+#define ABSMIN_ACC_VAL -(ABSMAX_ACC_VAL)
+
+/* Each axis is represented by a 2-byte data word */
+#define BMA150_XYZ_DATA_SIZE 6
+
+/* 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
+
+/* Data register addresses */
+#define BMA150_DATA_0_REG 0x00
+#define BMA150_DATA_1_REG 0x01
+#define BMA150_DATA_2_REG 0x02
+
+/* Control register addresses */
+#define BMA150_CTRL_0_REG 0x0A
+#define BMA150_CTRL_1_REG 0x0B
+#define BMA150_CTRL_2_REG 0x14
+#define BMA150_CTRL_3_REG 0x15
+
+/* Configuration/Setting register addresses */
+#define BMA150_CFG_0_REG 0x0C
+#define BMA150_CFG_1_REG 0x0D
+#define BMA150_CFG_2_REG 0x0E
+#define BMA150_CFG_3_REG 0x0F
+#define BMA150_CFG_4_REG 0x10
+#define BMA150_CFG_5_REG 0x11
+
+#define BMA150_CHIP_ID 2
+#define BMA150_CHIP_ID_REG BMA150_DATA_0_REG
+
+#define BMA150_ACC_X_LSB_REG BMA150_DATA_2_REG
+
+#define BMA150_SLEEP_POS 0
+#define BMA150_SLEEP_MSK 0x01
+#define BMA150_SLEEP_REG BMA150_CTRL_0_REG
+
+#define BMA150_BANDWIDTH_POS 0
+#define BMA150_BANDWIDTH_MSK 0x07
+#define BMA150_BANDWIDTH_REG BMA150_CTRL_2_REG
+
+#define BMA150_RANGE_POS 3
+#define BMA150_RANGE_MSK 0x18
+#define BMA150_RANGE_REG BMA150_CTRL_2_REG
+
+#define BMA150_WAKE_UP_POS 0
+#define BMA150_WAKE_UP_MSK 0x01
+#define BMA150_WAKE_UP_REG BMA150_CTRL_3_REG
+
+#define BMA150_SW_RES_POS 1
+#define BMA150_SW_RES_MSK 0x02
+#define BMA150_SW_RES_REG BMA150_CTRL_0_REG
+
+/* Any-motion interrupt register fields */
+#define BMA150_ANY_MOTION_EN_POS 6
+#define BMA150_ANY_MOTION_EN_MSK 0x40
+#define BMA150_ANY_MOTION_EN_REG BMA150_CTRL_1_REG
+
+#define BMA150_ANY_MOTION_DUR_POS 6
+#define BMA150_ANY_MOTION_DUR_MSK 0xC0
+#define BMA150_ANY_MOTION_DUR_REG BMA150_CFG_5_REG
+
+#define BMA150_ANY_MOTION_THRES_REG BMA150_CFG_4_REG
+
+/* Advanced interrupt register fields */
+#define BMA150_ADV_INT_EN_POS 6
+#define BMA150_ADV_INT_EN_MSK 0x40
+#define BMA150_ADV_INT_EN_REG BMA150_CTRL_3_REG
+
+/* High-G interrupt register fields */
+#define BMA150_HIGH_G_EN_POS 1
+#define BMA150_HIGH_G_EN_MSK 0x02
+#define BMA150_HIGH_G_EN_REG BMA150_CTRL_1_REG
+
+#define BMA150_HIGH_G_HYST_POS 3
+#define BMA150_HIGH_G_HYST_MSK 0x38
+#define BMA150_HIGH_G_HYST_REG BMA150_CFG_5_REG
+
+#define BMA150_HIGH_G_DUR_REG BMA150_CFG_3_REG
+#define BMA150_HIGH_G_THRES_REG BMA150_CFG_2_REG
+
+/* Low-G interrupt register fields */
+#define BMA150_LOW_G_EN_POS 0
+#define BMA150_LOW_G_EN_MSK 0x01
+#define BMA150_LOW_G_EN_REG BMA150_CTRL_1_REG
+
+#define BMA150_LOW_G_HYST_POS 0
+#define BMA150_LOW_G_HYST_MSK 0x07
+#define BMA150_LOW_G_HYST_REG BMA150_CFG_5_REG
+
+#define BMA150_LOW_G_DUR_REG BMA150_CFG_1_REG
+#define BMA150_LOW_G_THRES_REG BMA150_CFG_0_REG
+
+struct bma150_data {
+ struct i2c_client *client;
+ struct input_polled_dev *input_polled;
+ struct input_dev *input;
+ u8 mode;
+};
+
+/*
+ * The settings for the given range, bandwidth and interrupt features
+ * are stated and verified by Bosch Sensortec where they are configured
+ * to provide a generic sensitivity performance.
+ */
+static struct bma150_cfg default_cfg __devinitdata = {
+ .any_motion_int = 1,
+ .hg_int = 1,
+ .lg_int = 1,
+ .any_motion_dur = 0,
+ .any_motion_thres = 0,
+ .hg_hyst = 0,
+ .hg_dur = 150,
+ .hg_thres = 160,
+ .lg_hyst = 0,
+ .lg_dur = 150,
+ .lg_thres = 20,
+ .range = BMA150_RANGE_2G,
+ .bandwidth = BMA150_BW_50HZ
+};
+
+static int bma150_write_byte(struct i2c_client *client, u8 reg, u8 val)
+{
+ s32 ret;
+
+ /* As per specification, disable irq in between register writes */
+ if (client->irq)
+ disable_irq_nosync(client->irq);
+
+ ret = i2c_smbus_write_byte_data(client, reg, val);
+
+ if (client->irq)
+ enable_irq(client->irq);
+
+ return ret;
+}
+
+static int bma150_set_reg_bits(struct i2c_client *client,
+ int val, int shift, u8 mask, u8 reg)
+{
+ int data;
+
+ data = i2c_smbus_read_byte_data(client, reg);
+ if (data < 0)
+ return data;
+
+ data = (data & ~mask) | ((val << shift) & mask);
+ return bma150_write_byte(client, reg, data);
+}
+
+static int bma150_set_mode(struct bma150_data *bma150, u8 mode)
+{
+ int error;
+
+ error = bma150_set_reg_bits(bma150->client, mode, BMA150_WAKE_UP_POS,
+ BMA150_WAKE_UP_MSK, BMA150_WAKE_UP_REG);
+ if (error)
+ return error;
+
+ error = bma150_set_reg_bits(bma150->client, mode, BMA150_SLEEP_POS,
+ BMA150_SLEEP_MSK, BMA150_SLEEP_REG);
+ if (error)
+ return error;
+
+ if (mode == BMA150_MODE_NORMAL)
+ msleep(2);
+
+ bma150->mode = mode;
+ return 0;
+}
+
+static int __devinit bma150_soft_reset(struct bma150_data *bma150)
+{
+ int error;
+
+ error = bma150_set_reg_bits(bma150->client, 1, BMA150_SW_RES_POS,
+ BMA150_SW_RES_MSK, BMA150_SW_RES_REG);
+ if (error)
+ return error;
+
+ msleep(2);
+ return 0;
+}
+
+static int __devinit bma150_set_range(struct bma150_data *bma150, u8 range)
+{
+ return bma150_set_reg_bits(bma150->client, range, BMA150_RANGE_POS,
+ BMA150_RANGE_MSK, BMA150_RANGE_REG);
+}
+
+static int __devinit bma150_set_bandwidth(struct bma150_data *bma150, u8 bw)
+{
+ return bma150_set_reg_bits(bma150->client, bw, BMA150_BANDWIDTH_POS,
+ BMA150_BANDWIDTH_MSK, BMA150_BANDWIDTH_REG);
+}
+
+static int __devinit bma150_set_low_g_interrupt(struct bma150_data *bma150,
+ u8 enable, u8 hyst, u8 dur, u8 thres)
+{
+ int error;
+
+ error = bma150_set_reg_bits(bma150->client, hyst,
+ BMA150_LOW_G_HYST_POS, BMA150_LOW_G_HYST_MSK,
+ BMA150_LOW_G_HYST_REG);
+ if (error)
+ return error;
+
+ error = bma150_write_byte(bma150->client, BMA150_LOW_G_DUR_REG, dur);
+ if (error)
+ return error;
+
+ error = bma150_write_byte(bma150->client, BMA150_LOW_G_THRES_REG, thres);
+ if (error)
+ return error;
+
+ return bma150_set_reg_bits(bma150->client, !!enable,
+ BMA150_LOW_G_EN_POS, BMA150_LOW_G_EN_MSK,
+ BMA150_LOW_G_EN_REG);
+}
+
+static int __devinit bma150_set_high_g_interrupt(struct bma150_data *bma150,
+ u8 enable, u8 hyst, u8 dur, u8 thres)
+{
+ int error;
+
+ error = bma150_set_reg_bits(bma150->client, hyst,
+ BMA150_HIGH_G_HYST_POS, BMA150_HIGH_G_HYST_MSK,
+ BMA150_HIGH_G_HYST_REG);
+ if (error)
+ return error;
+
+ error = bma150_write_byte(bma150->client,
+ BMA150_HIGH_G_DUR_REG, dur);
+ if (error)
+ return error;
+
+ error = bma150_write_byte(bma150->client,
+ BMA150_HIGH_G_THRES_REG, thres);
+ if (error)
+ return error;
+
+ return bma150_set_reg_bits(bma150->client, !!enable,
+ BMA150_HIGH_G_EN_POS, BMA150_HIGH_G_EN_MSK,
+ BMA150_HIGH_G_EN_REG);
+}
+
+
+static int __devinit bma150_set_any_motion_interrupt(struct bma150_data *bma150,
+ u8 enable, u8 dur, u8 thres)
+{
+ int error;
+
+ error = bma150_set_reg_bits(bma150->client, dur,
+ BMA150_ANY_MOTION_DUR_POS,
+ BMA150_ANY_MOTION_DUR_MSK,
+ BMA150_ANY_MOTION_DUR_REG);
+ if (error)
+ return error;
+
+ error = bma150_write_byte(bma150->client,
+ BMA150_ANY_MOTION_THRES_REG, thres);
+ if (error)
+ return error;
+
+ error = bma150_set_reg_bits(bma150->client, !!enable,
+ BMA150_ADV_INT_EN_POS, BMA150_ADV_INT_EN_MSK,
+ BMA150_ADV_INT_EN_REG);
+ if (error)
+ return error;
+
+ return bma150_set_reg_bits(bma150->client, !!enable,
+ BMA150_ANY_MOTION_EN_POS,
+ BMA150_ANY_MOTION_EN_MSK,
+ BMA150_ANY_MOTION_EN_REG);
+}
+
+static void bma150_report_xyz(struct bma150_data *bma150)
+{
+ u8 data[BMA150_XYZ_DATA_SIZE];
+ s16 x, y, z;
+ s32 ret;
+
+ ret = i2c_smbus_read_i2c_block_data(bma150->client,
+ BMA150_ACC_X_LSB_REG, BMA150_XYZ_DATA_SIZE, data);
+ if (ret != BMA150_XYZ_DATA_SIZE)
+ 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 irqreturn_t bma150_irq_thread(int irq, void *dev)
+{
+ bma150_report_xyz(dev);
+
+ return IRQ_HANDLED;
+}
+
+static void bma150_poll(struct input_polled_dev *dev)
+{
+ bma150_report_xyz(dev->private);
+}
+
+static int bma150_open(struct bma150_data *bma150)
+{
+ int error;
+
+ error = pm_runtime_get_sync(&bma150->client->dev);
+ if (error && error != -ENOSYS)
+ return error;
+
+ /*
+ * See if runtime PM woke up the device. If runtime PM
+ * is disabled we need to do it ourselves.
+ */
+ if (bma150->mode != BMA150_MODE_NORMAL) {
+ error = bma150_set_mode(bma150, BMA150_MODE_NORMAL);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+static void bma150_close(struct bma150_data *bma150)
+{
+ pm_runtime_put_sync(&bma150->client->dev);
+
+ if (bma150->mode != BMA150_MODE_SLEEP)
+ bma150_set_mode(bma150, BMA150_MODE_SLEEP);
+}
+
+static int bma150_irq_open(struct input_dev *input)
+{
+ struct bma150_data *bma150 = input_get_drvdata(input);
+
+ return bma150_open(bma150);
+}
+
+static void bma150_irq_close(struct input_dev *input)
+{
+ struct bma150_data *bma150 = input_get_drvdata(input);
+
+ bma150_close(bma150);
+}
+
+static void bma150_poll_open(struct input_polled_dev *ipoll_dev)
+{
+ struct bma150_data *bma150 = ipoll_dev->private;
+
+ bma150_open(bma150);
+}
+
+static void bma150_poll_close(struct input_polled_dev *ipoll_dev)
+{
+ struct bma150_data *bma150 = ipoll_dev->private;
+
+ bma150_close(bma150);
+}
+
+static int __devinit bma150_initialize(struct bma150_data *bma150,
+ const struct bma150_cfg *cfg)
+{
+ int error;
+
+ error = bma150_soft_reset(bma150);
+ if (error)
+ return error;
+
+ error = bma150_set_bandwidth(bma150, cfg->bandwidth);
+ if (error)
+ return error;
+
+ error = bma150_set_range(bma150, cfg->range);
+ if (error)
+ return error;
+
+ if (bma150->client->irq) {
+ error = bma150_set_any_motion_interrupt(bma150,
+ cfg->any_motion_int,
+ cfg->any_motion_dur,
+ cfg->any_motion_thres);
+ if (error)
+ return error;
+
+ error = bma150_set_high_g_interrupt(bma150,
+ cfg->hg_int, cfg->hg_hyst,
+ cfg->hg_dur, cfg->hg_thres);
+ if (error)
+ return error;
+
+ error = bma150_set_low_g_interrupt(bma150,
+ cfg->lg_int, cfg->lg_hyst,
+ cfg->lg_dur, cfg->lg_thres);
+ if (error)
+ return error;
+ }
+
+ return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
+}
+
+static void __devinit bma150_init_input_device(struct bma150_data *bma150,
+ struct input_dev *idev)
+{
+ idev->name = BMA150_DRIVER;
+ idev->phys = BMA150_DRIVER "/input0";
+ idev->id.bustype = BUS_I2C;
+ idev->dev.parent = &bma150->client->dev;
+
+ idev->evbit[0] = BIT_MASK(EV_ABS);
+ 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);
+}
+
+static int __devinit bma150_register_input_device(struct bma150_data *bma150)
+{
+ struct input_dev *idev;
+ int error;
+
+ idev = input_allocate_device();
+ if (!idev)
+ return -ENOMEM;
+
+ bma150_init_input_device(bma150, idev);
+
+ idev->open = bma150_irq_open;
+ idev->close = bma150_irq_close;
+ input_set_drvdata(idev, bma150);
+
+ error = input_register_device(idev);
+ if (error) {
+ input_free_device(idev);
+ return error;
+ }
+
+ bma150->input = idev;
+ return 0;
+}
+
+static int __devinit bma150_register_polled_device(struct bma150_data *bma150)
+{
+ struct input_polled_dev *ipoll_dev;
+ int error;
+
+ ipoll_dev = input_allocate_polled_device();
+ if (!ipoll_dev)
+ return -ENOMEM;
+
+ ipoll_dev->private = bma150;
+ ipoll_dev->open = bma150_poll_open;
+ ipoll_dev->close = bma150_poll_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;
+
+ bma150_init_input_device(bma150, ipoll_dev->input);
+
+ error = input_register_polled_device(ipoll_dev);
+ if (error) {
+ input_free_polled_device(ipoll_dev);
+ return error;
+ }
+
+ bma150->input_polled = ipoll_dev;
+ bma150->input = ipoll_dev->input;
+
+ return 0;
+}
+
+static int __devinit bma150_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ const struct bma150_platform_data *pdata = client->dev.platform_data;
+ const struct bma150_cfg *cfg;
+ struct bma150_data *bma150;
+ int chip_id;
+ int error;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "i2c_check_functionality error\n");
+ return -EIO;
+ }
+
+ chip_id = i2c_smbus_read_byte_data(client, BMA150_CHIP_ID_REG);
+ if (chip_id != BMA150_CHIP_ID) {
+ dev_err(&client->dev, "BMA150 chip id error: %d\n", chip_id);
+ return -EINVAL;
+ }
+
+ bma150 = kzalloc(sizeof(struct bma150_data), GFP_KERNEL);
+ if (!bma150)
+ return -ENOMEM;
+
+ bma150->client = client;
+
+ if (pdata) {
+ if (pdata->irq_gpio_cfg) {
+ error = pdata->irq_gpio_cfg();
+ if (error) {
+ dev_err(&client->dev,
+ "IRQ GPIO conf. error %d, error %d\n",
+ client->irq, error);
+ goto err_free_mem;
+ }
+ }
+ cfg = &pdata->cfg;
+ } else {
+ cfg = &default_cfg;
+ }
+
+ error = bma150_initialize(bma150, cfg);
+ if (error)
+ goto err_free_mem;
+
+ if (client->irq > 0) {
+ error = bma150_register_input_device(bma150);
+ if (error)
+ goto err_free_mem;
+
+ error = request_threaded_irq(client->irq,
+ NULL, bma150_irq_thread,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ BMA150_DRIVER, bma150);
+ if (error) {
+ dev_err(&client->dev,
+ "irq request failed %d, error %d\n",
+ client->irq, error);
+ input_unregister_device(bma150->input);
+ goto err_free_mem;
+ }
+ } else {
+ error = bma150_register_polled_device(bma150);
+ if (error)
+ goto err_free_mem;
+ }
+
+ i2c_set_clientdata(client, bma150);
+
+ pm_runtime_enable(&client->dev);
+
+ return 0;
+
+err_free_mem:
+ kfree(bma150);
+ return error;
+}
+
+static int __devexit bma150_remove(struct i2c_client *client)
+{
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ pm_runtime_disable(&client->dev);
+
+ if (client->irq > 0) {
+ free_irq(client->irq, bma150);
+ input_unregister_device(bma150->input);
+ } else {
+ input_unregister_polled_device(bma150->input_polled);
+ input_free_polled_device(bma150->input_polled);
+ }
+
+ kfree(bma150);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int bma150_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ return bma150_set_mode(bma150, BMA150_MODE_SLEEP);
+}
+
+static int bma150_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct bma150_data *bma150 = i2c_get_clientdata(client);
+
+ return bma150_set_mode(bma150, BMA150_MODE_NORMAL);
+}
+#endif
+
+static UNIVERSAL_DEV_PM_OPS(bma150_pm, bma150_suspend, bma150_resume, NULL);
+
+static const struct i2c_device_id bma150_id[] = {
+ { "bma150", 0 },
+ { "smb380", 0 },
+ { "bma023", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, bma150_id);
+
+static struct i2c_driver bma150_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = BMA150_DRIVER,
+ .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);
projects / openwrt / staging / blogic.git / commitdiff