1 files changed, 691 insertions, 0 deletions

diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
new file mode 100644
index 000000000000..8f55b54352b6
--- /dev/null
+++ b/drivers/input/misc/bma150.c
@@ -0,0 +1,691 @@
+/*
+ * 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);