Input: add support for Kionix KXTJ9 accelerometer

Signed-off-by: Chris Hudson <chudson@kionix.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 689 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 6fdce4b86856..01344280e145 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -230,6 +230,23 @@ config INPUT_KEYSPAN_REMOTE
           To compile this driver as a module, choose M here: the module will
           be called keyspan_remote.
 
+config INPUT_KXTJ9
+        tristate "Kionix KXTJ9 tri-axis digital accelerometer"
+        depends on I2C
+        help
+          Say Y here to enable support for the Kionix KXTJ9 digital tri-axis
+          accelerometer.
+
+          To compile this driver as a module, choose M here: the module will
+          be called kxtj9.
+
+config INPUT_KXTJ9_POLLED_MODE
+        bool "Enable polling mode support"
+        depends on INPUT_KXTJ9
+        select INPUT_POLLDEV
+        help
+          Say Y here if you need accelerometer to work in polling mode.
+
 config INPUT_POWERMATE
         tristate "Griffin PowerMate and Contour Jog support"
         depends on USB_ARCH_HAS_HCD
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index b7e227aa117a..be39d813354d 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_INPUT_DM355EVM)		+= dm355evm_keys.o
 obj-$(CONFIG_HP_SDC_RTC)                += hp_sdc_rtc.o
 obj-$(CONFIG_INPUT_IXP4XX_BEEPER)       += ixp4xx-beeper.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)      += keyspan_remote.o
+obj-$(CONFIG_INPUT_KXTJ9)               += kxtj9.o
 obj-$(CONFIG_INPUT_M68K_BEEP)           += m68kspkr.o
 obj-$(CONFIG_INPUT_MAX8925_ONKEY)       += max8925_onkey.o
 obj-$(CONFIG_INPUT_MMA8450)             += mma8450.o
diff --git a/drivers/input/misc/kxtj9.c b/drivers/input/misc/kxtj9.c
new file mode 100644
index 000000000000..a416f7f06738
--- /dev/null
+++ b/drivers/input/misc/kxtj9.c
@@ -0,0 +1,671 @@
+/*
+ * Copyright (C) 2011 Kionix, Inc.
+ * Written by Chris Hudson <chudson@kionix.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307, USA
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/input/kxtj9.h>
+#include <linux/input-polldev.h>
+
+#define NAME                    "kxtj9"
+#define G_MAX                   8000
+/* OUTPUT REGISTERS */
+#define XOUT_L                  0x06
+#define WHO_AM_I                0x0F
+/* CONTROL REGISTERS */
+#define INT_REL                 0x1A
+#define CTRL_REG1               0x1B
+#define INT_CTRL1               0x1E
+#define DATA_CTRL               0x21
+/* CONTROL REGISTER 1 BITS */
+#define PC1_OFF                 0x7F
+#define PC1_ON                  (1 << 7)
+/* Data ready funtion enable bit: set during probe if using irq mode */
+#define DRDYE                   (1 << 5)
+/* INTERRUPT CONTROL REGISTER 1 BITS */
+/* Set these during probe if using irq mode */
+#define KXTJ9_IEL               (1 << 3)
+#define KXTJ9_IEA               (1 << 4)
+#define KXTJ9_IEN               (1 << 5)
+/* INPUT_ABS CONSTANTS */
+#define FUZZ                    3
+#define FLAT                    3
+/* RESUME STATE INDICES */
+#define RES_DATA_CTRL           0
+#define RES_CTRL_REG1           1
+#define RES_INT_CTRL1           2
+#define RESUME_ENTRIES          3
+
+/*
+ * The following table lists the maximum appropriate poll interval for each
+ * available output data rate.
+ */
+static const struct {
+        unsigned int cutoff;
+        u8 mask;
+} kxtj9_odr_table[] = {
+        { 3,    ODR800F },
+        { 5,    ODR400F },
+        { 10,   ODR200F },
+        { 20,   ODR100F },
+        { 40,   ODR50F  },
+        { 80,   ODR25F  },
+        { 0,    ODR12_5F},
+};
+
+struct kxtj9_data {
+        struct i2c_client *client;
+        struct kxtj9_platform_data pdata;
+        struct input_dev *input_dev;
+#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
+        struct input_polled_dev *poll_dev;
+#endif
+        unsigned int last_poll_interval;
+        u8 shift;
+        u8 ctrl_reg1;
+        u8 data_ctrl;
+        u8 int_ctrl;
+};
+
+static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
+{
+        struct i2c_msg msgs[] = {
+                {
+                        .addr = tj9->client->addr,
+                        .flags = tj9->client->flags,
+                        .len = 1,
+                        .buf = &addr,
+                },
+                {
+                        .addr = tj9->client->addr,
+                        .flags = tj9->client->flags | I2C_M_RD,
+                        .len = len,
+                        .buf = data,
+                },
+        };
+
+        return i2c_transfer(tj9->client->adapter, msgs, 2);
+}
+
+static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
+{
+        s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
+        s16 x, y, z;
+        int err;
+
+        err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
+        if (err < 0)
+                dev_err(&tj9->client->dev, "accelerometer data read failed\n");
+
+        x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]) >> tj9->shift;
+        y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]) >> tj9->shift;
+        z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]) >> tj9->shift;
+
+        input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
+        input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
+        input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
+        input_sync(tj9->input_dev);
+}
+
+static irqreturn_t kxtj9_isr(int irq, void *dev)
+{
+        struct kxtj9_data *tj9 = dev;
+        int err;
+
+        /* data ready is the only possible interrupt type */
+        kxtj9_report_acceleration_data(tj9);
+
+        err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
+        if (err < 0)
+                dev_err(&tj9->client->dev,
+                        "error clearing interrupt status: %d\n", err);
+
+        return IRQ_HANDLED;
+}
+
+static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
+{
+        switch (new_g_range) {
+        case KXTJ9_G_2G:
+                tj9->shift = 4;
+                break;
+        case KXTJ9_G_4G:
+                tj9->shift = 3;
+                break;
+        case KXTJ9_G_8G:
+                tj9->shift = 2;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        tj9->ctrl_reg1 &= 0xe7;
+        tj9->ctrl_reg1 |= new_g_range;
+
+        return 0;
+}
+
+static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
+{
+        int err;
+        int i;
+
+        /* Use the lowest ODR that can support the requested poll interval */
+        for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
+                tj9->data_ctrl = kxtj9_odr_table[i].mask;
+                if (poll_interval < kxtj9_odr_table[i].cutoff)
+                        break;
+        }
+
+        err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
+        if (err < 0)
+                return err;
+
+        err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
+        if (err < 0)
+                return err;
+
+        err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int kxtj9_device_power_on(struct kxtj9_data *tj9)
+{
+        if (tj9->pdata.power_on)
+                return tj9->pdata.power_on();
+
+        return 0;
+}
+
+static void kxtj9_device_power_off(struct kxtj9_data *tj9)
+{
+        int err;
+
+        tj9->ctrl_reg1 &= PC1_OFF;
+        err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
+        if (err < 0)
+                dev_err(&tj9->client->dev, "soft power off failed\n");
+
+        if (tj9->pdata.power_off)
+                tj9->pdata.power_off();
+}
+
+static int kxtj9_enable(struct kxtj9_data *tj9)
+{
+        int err;
+
+        err = kxtj9_device_power_on(tj9);
+        if (err < 0)
+                return err;
+
+        /* ensure that PC1 is cleared before updating control registers */
+        err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
+        if (err < 0)
+                return err;
+
+        /* only write INT_CTRL_REG1 if in irq mode */
+        if (tj9->client->irq) {
+                err = i2c_smbus_write_byte_data(tj9->client,
+                                                INT_CTRL1, tj9->int_ctrl);
+                if (err < 0)
+                        return err;
+        }
+
+        err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
+        if (err < 0)
+                return err;
+
+        /* turn on outputs */
+        tj9->ctrl_reg1 |= PC1_ON;
+        err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
+        if (err < 0)
+                return err;
+
+        err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
+        if (err < 0)
+                return err;
+
+        /* clear initial interrupt if in irq mode */
+        if (tj9->client->irq) {
+                err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
+                if (err < 0) {
+                        dev_err(&tj9->client->dev,
+                                "error clearing interrupt: %d\n", err);
+                        goto fail;
+                }
+        }
+
+        return 0;
+
+fail:
+        kxtj9_device_power_off(tj9);
+        return err;
+}
+
+static void kxtj9_disable(struct kxtj9_data *tj9)
+{
+        kxtj9_device_power_off(tj9);
+}
+
+static int kxtj9_input_open(struct input_dev *input)
+{
+        struct kxtj9_data *tj9 = input_get_drvdata(input);
+
+        return kxtj9_enable(tj9);
+}
+
+static void kxtj9_input_close(struct input_dev *dev)
+{
+        struct kxtj9_data *tj9 = input_get_drvdata(dev);
+
+        kxtj9_disable(tj9);
+}
+
+static void __devinit kxtj9_init_input_device(struct kxtj9_data *tj9,
+                                              struct input_dev *input_dev)
+{
+        __set_bit(EV_ABS, input_dev->evbit);
+        input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
+        input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
+        input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
+
+        input_dev->name = "kxtj9_accel";
+        input_dev->id.bustype = BUS_I2C;
+        input_dev->dev.parent = &tj9->client->dev;
+}
+
+static int __devinit kxtj9_setup_input_device(struct kxtj9_data *tj9)
+{
+        struct input_dev *input_dev;
+        int err;
+
+        input_dev = input_allocate_device();
+        if (!tj9->input_dev) {
+                dev_err(&tj9->client->dev, "input device allocate failed\n");
+                return -ENOMEM;
+        }
+
+        tj9->input_dev = input_dev;
+
+        input_dev->open = kxtj9_input_open;
+        input_dev->close = kxtj9_input_close;
+        input_set_drvdata(input_dev, tj9);
+
+        kxtj9_init_input_device(tj9, input_dev);
+
+        err = input_register_device(tj9->input_dev);
+        if (err) {
+                dev_err(&tj9->client->dev,
+                        "unable to register input polled device %s: %d\n",
+                        tj9->input_dev->name, err);
+                input_free_device(tj9->input_dev);
+                return err;
+        }
+
+        return 0;
+}
+
+/*
+ * When IRQ mode is selected, we need to provide an interface to allow the user
+ * to change the output data rate of the part.  For consistency, we are using
+ * the set_poll method, which accepts a poll interval in milliseconds, and then
+ * calls update_odr() while passing this value as an argument.  In IRQ mode, the
+ * data outputs will not be read AT the requested poll interval, rather, the
+ * lowest ODR that can support the requested interval.  The client application
+ * will be responsible for retrieving data from the input node at the desired
+ * interval.
+ */
+
+/* Returns currently selected poll interval (in ms) */
+static ssize_t kxtj9_get_poll(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+
+        return sprintf(buf, "%d\n", tj9->last_poll_interval);
+}
+
+/* Allow users to select a new poll interval (in ms) */
+static ssize_t kxtj9_set_poll(struct device *dev, struct device_attribute *attr,
+                                                const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+        struct input_dev *input_dev = tj9->input_dev;
+        unsigned int interval;
+        int error;
+
+        error = kstrtouint(buf, 10, &interval);
+        if (error < 0)
+                return error;
+
+        /* Lock the device to prevent races with open/close (and itself) */
+        mutex_unlock(&input_dev->mutex);
+
+        disable_irq(client->irq);
+
+        /*
+         * Set current interval to the greater of the minimum interval or
+         * the requested interval
+         */
+        tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
+
+        kxtj9_update_odr(tj9, tj9->last_poll_interval);
+
+        enable_irq(client->irq);
+        mutex_unlock(&input_dev->mutex);
+
+        return count;
+}
+
+static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
+
+static struct attribute *kxtj9_attributes[] = {
+        &dev_attr_poll.attr,
+        NULL
+};
+
+static struct attribute_group kxtj9_attribute_group = {
+        .attrs = kxtj9_attributes
+};
+
+
+#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
+static void kxtj9_poll(struct input_polled_dev *dev)
+{
+        struct kxtj9_data *tj9 = dev->private;
+        unsigned int poll_interval = dev->poll_interval;
+
+        kxtj9_report_acceleration_data(tj9);
+
+        if (poll_interval != tj9->last_poll_interval) {
+                kxtj9_update_odr(tj9, poll_interval);
+                tj9->last_poll_interval = poll_interval;
+        }
+}
+
+static void kxtj9_polled_input_open(struct input_polled_dev *dev)
+{
+        struct kxtj9_data *tj9 = dev->private;
+
+        kxtj9_enable(tj9);
+}
+
+static void kxtj9_polled_input_close(struct input_polled_dev *dev)
+{
+        struct kxtj9_data *tj9 = dev->private;
+
+        kxtj9_disable(tj9);
+}
+
+static int __devinit kxtj9_setup_polled_device(struct kxtj9_data *tj9)
+{
+        int err;
+        struct input_polled_dev *poll_dev;
+        poll_dev = input_allocate_polled_device();
+
+        if (!poll_dev) {
+                dev_err(&tj9->client->dev,
+                        "Failed to allocate polled device\n");
+                return -ENOMEM;
+        }
+
+        tj9->poll_dev = poll_dev;
+        tj9->input_dev = poll_dev->input;
+
+        poll_dev->private = tj9;
+        poll_dev->poll = kxtj9_poll;
+        poll_dev->open = kxtj9_polled_input_open;
+        poll_dev->close = kxtj9_polled_input_close;
+
+        kxtj9_init_input_device(tj9, poll_dev->input);
+
+        err = input_register_polled_device(poll_dev);
+        if (err) {
+                dev_err(&tj9->client->dev,
+                        "Unable to register polled device, err=%d\n", err);
+                input_free_polled_device(poll_dev);
+                return err;
+        }
+
+        return 0;
+}
+
+static void __devexit kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
+{
+        input_unregister_polled_device(tj9->poll_dev);
+        input_free_polled_device(tj9->poll_dev);
+}
+
+#else
+
+static inline int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
+{
+        return -ENOSYS;
+}
+
+static inline void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
+{
+}
+
+#endif
+
+static int __devinit kxtj9_verify(struct kxtj9_data *tj9)
+{
+        int retval;
+
+        retval = kxtj9_device_power_on(tj9);
+        if (retval < 0)
+                return retval;
+
+        retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
+        if (retval < 0) {
+                dev_err(&tj9->client->dev, "read err int source\n");
+                goto out;
+        }
+
+        retval = retval != 0x06 ? -EIO : 0;
+
+out:
+        kxtj9_device_power_off(tj9);
+        return retval;
+}
+
+static int __devinit kxtj9_probe(struct i2c_client *client,
+                                 const struct i2c_device_id *id)
+{
+        const struct kxtj9_platform_data *pdata = client->dev.platform_data;
+        struct kxtj9_data *tj9;
+        int err;
+
+        if (!i2c_check_functionality(client->adapter,
+                                I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
+                dev_err(&client->dev, "client is not i2c capable\n");
+                return -ENXIO;
+        }
+
+        if (!pdata) {
+                dev_err(&client->dev, "platform data is NULL; exiting\n");
+                return -EINVAL;
+        }
+
+        tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
+        if (!tj9) {
+                dev_err(&client->dev,
+                        "failed to allocate memory for module data\n");
+                return -ENOMEM;
+        }
+
+        tj9->client = client;
+        tj9->pdata = *pdata;
+
+        if (pdata->init) {
+                err = pdata->init();
+                if (err < 0)
+                        goto err_free_mem;
+        }
+
+        err = kxtj9_verify(tj9);
+        if (err < 0) {
+                dev_err(&client->dev, "device not recognized\n");
+                goto err_pdata_exit;
+        }
+
+        i2c_set_clientdata(client, tj9);
+
+        tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
+        tj9->data_ctrl = tj9->pdata.data_odr_init;
+
+        if (client->irq) {
+                /* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
+                tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
+                tj9->ctrl_reg1 |= DRDYE;
+
+                err = kxtj9_setup_input_device(tj9);
+                if (err)
+                        goto err_pdata_exit;
+
+                err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
+                                           IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+                                           "kxtj9-irq", tj9);
+                if (err) {
+                        dev_err(&client->dev, "request irq failed: %d\n", err);
+                        goto err_destroy_input;
+                }
+
+                err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
+                if (err) {
+                        dev_err(&client->dev, "sysfs create failed: %d\n", err);
+                        goto err_free_irq;
+                }
+
+        } else {
+                err = kxtj9_setup_polled_device(tj9);
+                if (err)
+                        goto err_pdata_exit;
+        }
+
+        return 0;
+
+err_free_irq:
+        free_irq(client->irq, tj9);
+err_destroy_input:
+        input_unregister_device(tj9->input_dev);
+err_pdata_exit:
+        if (tj9->pdata.exit)
+                tj9->pdata.exit();
+err_free_mem:
+        kfree(tj9);
+        return err;
+}
+
+static int __devexit kxtj9_remove(struct i2c_client *client)
+{
+        struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+
+        if (client->irq) {
+                sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
+                free_irq(client->irq, tj9);
+                input_unregister_device(tj9->input_dev);
+        } else {
+                kxtj9_teardown_polled_device(tj9);
+        }
+
+        if (tj9->pdata.exit)
+                tj9->pdata.exit();
+
+        kfree(tj9);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int kxtj9_suspend(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+        struct input_dev *input_dev = tj9->input_dev;
+
+        mutex_lock(&input_dev->mutex);
+
+        if (input_dev->users)
+                kxtj9_disable(tj9);
+
+        mutex_unlock(&input_dev->mutex);
+        return 0;
+}
+
+static int kxtj9_resume(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+        struct input_dev *input_dev = tj9->input_dev;
+        int retval = 0;
+
+        mutex_lock(&input_dev->mutex);
+
+        if (input_dev->users)
+                kxtj9_enable(tj9);
+
+        mutex_unlock(&input_dev->mutex);
+        return retval;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
+
+static const struct i2c_device_id kxtj9_id[] = {
+        { NAME, 0 },
+        { },
+};
+
+MODULE_DEVICE_TABLE(i2c, kxtj9_id);
+
+static struct i2c_driver kxtj9_driver = {
+        .driver = {
+                .name   = NAME,
+                .owner  = THIS_MODULE,
+                .pm     = &kxtj9_pm_ops,
+        },
+        .probe          = kxtj9_probe,
+        .remove         = __devexit_p(kxtj9_remove),
+        .id_table       = kxtj9_id,
+};
+
+static int __init kxtj9_init(void)
+{
+        return i2c_add_driver(&kxtj9_driver);
+}
+module_init(kxtj9_init);
+
+static void __exit kxtj9_exit(void)
+{
+        i2c_del_driver(&kxtj9_driver);
+}
+module_exit(kxtj9_exit);
+
+MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
+MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
+MODULE_LICENSE("GPL");