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Subject[PATCH v4] input: Add support for Kionix KXTJ9 accelerometer
Date
Quite a few changes this time around (thanks Jonathan and Dmitry!):
- The sysfs node for poll_interval was changed to emulate input_polldev. I
could not actually use input_polldev because some commands need to be sent
to the hardware when the poll interval is changed.
- Locking cleaned up throughout
- Cleared up distinction between IRQ and polling modes: if client->irq, then
irq mode is enabled. Removed register bits required for irq from the header;
these will be set in the driver if client->irq is populated.
- Put .suspend and .resume into struct dev_pm_ops.
- Many other smaller changes, unnecessary variables removed, etc.

Signed-off-by: Chris Hudson <chudson@kionix.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
---
drivers/input/misc/Kconfig | 10 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/kxtj9.c | 606 +++++++++++++++++++++++++++++++++++++++++++
include/linux/input/kxtj9.h | 76 ++++++
4 files changed, 693 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/misc/kxtj9.c
create mode 100644 include/linux/input/kxtj9.h

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index f9cf088..567f3d2 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -467,4 +467,14 @@ config INPUT_XEN_KBDDEV_FRONTEND
To compile this driver as a module, choose M here: the
module will be called xen-kbdfront.

+config INPUT_KXTJ9
+ tristate "Kionix KXTJ9 tri-axis digital accelerometer"
+ depends on I2C && SYSFS
+ help
+ If you say yes here you get support for the Kionix KXTJ9 digital
+ tri-axis accelerometer.
+
+ This driver can also be built as a module. If so, the module
+ will be called kxtj9.
+
endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index e3f7984..f2477ef 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_PCAP) += pcap_keys.o
diff --git a/drivers/input/misc/kxtj9.c b/drivers/input/misc/kxtj9.c
new file mode 100644
index 0000000..ef83182
--- /dev/null
+++ b/drivers/input/misc/kxtj9.c
@@ -0,0 +1,606 @@
+/*
+ * 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>
+
+#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 mutex lock;
+ struct delayed_work input_work;
+ struct input_dev *input_dev;
+
+ bool hw_initialized;
+ bool enabled;
+ u8 shift;
+ u8 resume[RESUME_ENTRIES];
+};
+
+static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
+{
+ int err;
+
+ 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,
+ },
+ };
+ err = i2c_transfer(tj9->client->adapter, msgs, 2);
+
+ return err;
+}
+
+static int kxtj9_verify(struct kxtj9_data *tj9)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
+ if (ret < 0)
+ dev_err(&tj9->client->dev, "read err int source\n");
+ if (ret != 0x06)
+ ret = -EIO;
+
+ return ret;
+}
+
+static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
+{
+ switch (new_g_range) {
+ case KXTJ9_G_2G:
+ tj9->shift = SHIFT_ADJ_2G;
+ break;
+ case KXTJ9_G_4G:
+ tj9->shift = SHIFT_ADJ_4G;
+ break;
+ case KXTJ9_G_8G:
+ tj9->shift = SHIFT_ADJ_8G;
+ break;
+ default:
+ return -EINVAL;
+ }
+ tj9->resume[RES_CTRL_REG1] = (tj9->resume[RES_CTRL_REG1] & 0xE7)
+ | new_g_range;
+
+ return 0;
+}
+
+static int kxtj9_update_odr(struct kxtj9_data *tj9, int poll_interval)
+{
+ int err;
+ int i;
+ u8 config;
+ u8 temp = 0;
+
+ /* Use the lowest ODR that can support the requested poll interval */
+ for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
+ config = kxtj9_odr_table[i].mask;
+ if (poll_interval < kxtj9_odr_table[i].cutoff)
+ break;
+ }
+
+ if (tj9->enabled == true) {
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, temp);
+ if (err < 0)
+ return err;
+ err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, config);
+ if (err < 0)
+ return err;
+ temp = tj9->resume[RES_CTRL_REG1];
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, temp);
+ if (err < 0)
+ return err;
+ /* Cancel and restart polling if not in irq mode */
+ if (!tj9->client->irq) {
+ cancel_delayed_work_sync(&tj9->input_work);
+ schedule_delayed_work(&tj9->input_work,
+ msecs_to_jiffies(poll_interval));
+ }
+ }
+ tj9->resume[RES_DATA_CTRL] = config;
+
+ return 0;
+}
+
+static int kxtj9_hw_init(struct kxtj9_data *tj9)
+{
+ int err;
+ u8 buf = 0;
+
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, buf);
+ if (err < 0)
+ return err;
+ err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL,
+ tj9->resume[RES_DATA_CTRL]);
+ if (err < 0)
+ return err;
+ if (tj9->client->irq) /* only write INT_CTRL_REG1 if in irq mode */
+ err = i2c_smbus_write_byte_data(tj9->client, INT_CTRL1,
+ tj9->resume[RES_INT_CTRL1]);
+ if (err < 0)
+ return err;
+
+ err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
+ if (err < 0)
+ return err;
+
+ buf = (tj9->resume[RES_CTRL_REG1] | PC1_ON);
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, buf);
+ if (err < 0)
+ return err;
+ tj9->resume[RES_CTRL_REG1] = buf;
+
+ err = kxtj9_update_odr(tj9, tj9->pdata.poll_interval);
+ if (err < 0)
+ return err;
+
+ tj9->hw_initialized = true;
+
+ return 0;
+}
+
+static void kxtj9_device_power_off(struct kxtj9_data *tj9)
+{
+ int err;
+ u8 buf;
+
+ buf = tj9->resume[RES_CTRL_REG1] & PC1_OFF;
+ err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, buf);
+ if (err < 0)
+ dev_err(&tj9->client->dev, "soft power off failed\n");
+ if (tj9->pdata.power_off)
+ tj9->pdata.power_off();
+ tj9->resume[RES_CTRL_REG1] = buf;
+ tj9->hw_initialized = false;
+}
+
+static int kxtj9_device_power_on(struct kxtj9_data *tj9)
+{
+ int err;
+
+ if (tj9->pdata.power_on) {
+ err = tj9->pdata.power_on();
+ if (err < 0)
+ return err;
+ }
+ if (!tj9->hw_initialized) {
+ msleep(40);
+ err = kxtj9_hw_init(tj9);
+ if (err < 0) {
+ kxtj9_device_power_off(tj9);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static void kxtj9_get_acceleration_data(struct kxtj9_data *tj9, s16 *xyz)
+{
+ int err;
+ /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
+ s16 acc_data[3];
+
+ err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
+ if (err < 0)
+ dev_err(&tj9->client->dev, "accelerometer data read failed\n");
+
+ acc_data[0] = le16_to_cpu(acc_data[0]);
+ acc_data[1] = le16_to_cpu(acc_data[1]);
+ acc_data[2] = le16_to_cpu(acc_data[2]);
+
+ acc_data[0] >>= tj9->shift;
+ acc_data[1] >>= tj9->shift;
+ acc_data[2] >>= tj9->shift;
+
+ xyz[0] = (tj9->pdata.negate_x) ? (-acc_data[tj9->pdata.axis_map_x])
+ : (acc_data[tj9->pdata.axis_map_x]);
+ xyz[1] = (tj9->pdata.negate_y) ? (-acc_data[tj9->pdata.axis_map_y])
+ : (acc_data[tj9->pdata.axis_map_y]);
+ xyz[2] = (tj9->pdata.negate_z) ? (-acc_data[tj9->pdata.axis_map_z])
+ : (acc_data[tj9->pdata.axis_map_z]);
+
+ input_report_abs(tj9->input_dev, ABS_X, (int) xyz[0]);
+ input_report_abs(tj9->input_dev, ABS_Y, (int) xyz[1]);
+ input_report_abs(tj9->input_dev, ABS_Z, (int) xyz[2]);
+ input_sync(tj9->input_dev);
+}
+
+static irqreturn_t kxtj9_isr(int irq, void *dev)
+{
+ struct kxtj9_data *tj9 = dev;
+ int ret;
+ s16 xyz[3];
+
+ /* data ready is the only possible interrupt type */
+ kxtj9_get_acceleration_data(tj9, xyz);
+
+ ret = i2c_smbus_read_byte_data(tj9->client, INT_REL);
+ if (ret < 0)
+ dev_err(&tj9->client->dev,
+ "error clearing interrupt status: %d\n", ret);
+
+ return IRQ_HANDLED;
+}
+
+static int kxtj9_enable(struct kxtj9_data *tj9)
+{
+ int err = 0;
+
+ mutex_lock(&tj9->lock);
+ if (tj9->enabled == false) {
+ err = kxtj9_device_power_on(tj9);
+ if (err < 0) {
+ dev_err(&tj9->client->dev,
+ "error during power-on: %d\n", err);
+ goto err0;
+ }
+ 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 err0;
+ }
+ if (!tj9->client->irq) /* queue polling if not in irq mode */
+ schedule_delayed_work(&tj9->input_work,
+ msecs_to_jiffies(tj9->pdata.poll_interval));
+ tj9->enabled = true;
+ }
+err0:
+ mutex_unlock(&tj9->lock);
+
+ return err;
+}
+
+static int kxtj9_disable(struct kxtj9_data *tj9)
+{
+ mutex_lock(&tj9->lock);
+ if (tj9->enabled == true) {
+ if (!tj9->client->irq) /* cancel polling if not in irq mode */
+ cancel_delayed_work_sync(&tj9->input_work);
+ kxtj9_device_power_off(tj9);
+ tj9->enabled = false;
+ }
+ mutex_unlock(&tj9->lock);
+
+ return 0;
+}
+
+static void kxtj9_input_work_func(struct work_struct *work)
+{
+ struct kxtj9_data *tj9 = container_of(work, struct kxtj9_data,
+ input_work.work);
+ s16 xyz[3];
+ mutex_lock(&tj9->lock);
+
+ kxtj9_get_acceleration_data(tj9, xyz);
+
+ schedule_delayed_work(&tj9->input_work,
+ msecs_to_jiffies(tj9->pdata.poll_interval));
+ mutex_unlock(&tj9->lock);
+}
+
+static int kxtj9_input_open(struct input_dev *input)
+{
+ return kxtj9_enable(input_get_drvdata(input));
+}
+
+static void kxtj9_input_close(struct input_dev *dev)
+{
+ kxtj9_disable(input_get_drvdata(dev));
+}
+
+static int kxtj9_input_init(struct kxtj9_data *tj9)
+{
+ int err;
+
+ if (!tj9->client->irq) /* only use input_work if not in irq mode */
+ INIT_DELAYED_WORK(&tj9->input_work, kxtj9_input_work_func);
+ tj9->input_dev = input_allocate_device();
+ if (!tj9->input_dev) {
+ err = -ENOMEM;
+ dev_err(&tj9->client->dev, "input device allocate failed\n");
+ goto err0;
+ }
+ tj9->input_dev->open = kxtj9_input_open;
+ tj9->input_dev->close = kxtj9_input_close;
+
+ input_set_drvdata(tj9->input_dev, tj9);
+
+ set_bit(EV_ABS, tj9->input_dev->evbit);
+
+ input_set_abs_params(tj9->input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
+ input_set_abs_params(tj9->input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
+ input_set_abs_params(tj9->input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
+
+ tj9->input_dev->name = "kxtj9_accel";
+ tj9->input_dev->id.bustype = BUS_I2C;
+ tj9->input_dev->dev.parent = &tj9->client->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);
+ goto err1;
+ }
+
+ return 0;
+err1:
+ input_free_device(tj9->input_dev);
+err0:
+ return err;
+}
+
+/* kxtj9_delay_show: returns the currently selected poll interval (in ms) */
+static ssize_t kxtj9_get_poll(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct kxtj9_data *tj9 = i2c_get_clientdata(to_i2c_client(dev));
+ return sprintf(buf, "%d\n", tj9->pdata.poll_interval);
+}
+
+/* kxtj9_delay_store: allows the user 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 kxtj9_data *tj9 = i2c_get_clientdata(to_i2c_client(dev));
+ unsigned long interval;
+ int ret = kstrtoul(buf, 10, &interval);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&tj9->lock);
+ /* set current interval to the greater of the minimum interval or
+ the requested interval */
+ tj9->pdata.poll_interval = max((int)interval, tj9->pdata.min_interval);
+ mutex_unlock(&tj9->lock);
+
+ kxtj9_update_odr(tj9, tj9->pdata.poll_interval);
+
+ 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
+};
+
+static int __devinit kxtj9_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err = -1;
+ struct kxtj9_data *tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
+ if (tj9 == NULL) {
+ dev_err(&client->dev,
+ "failed to allocate memory for module data\n");
+ err = -ENOMEM;
+ goto err0;
+ }
+ if (client->dev.platform_data == NULL) {
+ dev_err(&client->dev, "platform data is NULL; exiting\n");
+ err = -ENODEV;
+ goto err0;
+ }
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
+ I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&client->dev, "client not i2c capable\n");
+ err = -ENODEV;
+ goto err0;
+ }
+ mutex_init(&tj9->lock);
+ mutex_lock(&tj9->lock);
+ tj9->client = client;
+ i2c_set_clientdata(client, tj9);
+
+ memcpy(&tj9->pdata, client->dev.platform_data, sizeof(tj9->pdata));
+ if (tj9->pdata.init) {
+ err = tj9->pdata.init();
+ if (err < 0)
+ goto err1;
+ }
+
+ err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
+ if (err)
+ goto err2;
+
+ tj9->resume[RES_CTRL_REG1] = tj9->pdata.res_12bit | tj9->pdata.g_range;
+ tj9->resume[RES_DATA_CTRL] = tj9->pdata.data_odr_init;
+
+ if (client->irq) {
+ err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT, "kxtj9-irq", tj9);
+ if (err < 0) {
+ pr_err("%s: request irq failed: %d\n", __func__, err);
+ goto err5;
+ }
+ /* if in irq mode, populate INT_CTRL_REG1 and enable DRDY */
+ tj9->resume[RES_INT_CTRL1] = KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
+ tj9->resume[RES_CTRL_REG1] |= DRDYE;
+ }
+
+ err = kxtj9_input_init(tj9);
+ if (err < 0)
+ goto err3;
+
+ err = kxtj9_device_power_on(tj9);
+ if (err < 0)
+ goto err4;
+ tj9->enabled = true;
+
+ err = kxtj9_verify(tj9);
+ if (err < 0) {
+ dev_err(&client->dev, "device not recognized\n");
+ goto err5;
+ }
+
+ mutex_unlock(&tj9->lock);
+
+ return 0;
+
+err5:
+ kxtj9_device_power_off(tj9);
+err4:
+ input_unregister_device(tj9->input_dev);
+err3:
+ sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
+err2:
+ if (tj9->pdata.exit)
+ tj9->pdata.exit();
+err1:
+ mutex_unlock(&tj9->lock);
+err0:
+ kfree(tj9);
+ return err;
+}
+
+static int __devexit kxtj9_remove(struct i2c_client *client)
+{
+ struct kxtj9_data *tj9 = i2c_get_clientdata(client);
+
+ sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
+ if (client->irq)
+ free_irq(client->irq, tj9);
+ input_unregister_device(tj9->input_dev);
+ kxtj9_device_power_off(tj9);
+ if (tj9->pdata.exit)
+ tj9->pdata.exit();
+ kfree(tj9);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int kxtj9_resume(struct device *dev)
+{
+ return kxtj9_enable(i2c_get_clientdata(to_i2c_client(dev)));
+}
+
+static int kxtj9_suspend(struct device *dev)
+{
+ return kxtj9_disable(i2c_get_clientdata(to_i2c_client(dev)));
+}
+
+static const struct dev_pm_ops kxtj9_pm_ops = {
+ .suspend = kxtj9_suspend,
+ .resume = kxtj9_resume,
+};
+#endif
+
+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,
+#ifdef CONFIG_PM
+ .pm = &kxtj9_pm_ops,
+#endif
+ },
+ .probe = kxtj9_probe,
+ .remove = __devexit_p(kxtj9_remove),
+ .id_table = kxtj9_id,
+};
+
+static int __init kxtj9_init(void)
+{
+ return i2c_add_driver(&kxtj9_driver);
+}
+
+static void __exit kxtj9_exit(void)
+{
+ i2c_del_driver(&kxtj9_driver);
+}
+
+module_init(kxtj9_init);
+module_exit(kxtj9_exit);
+
+MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
+MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/input/kxtj9.h b/include/linux/input/kxtj9.h
new file mode 100644
index 0000000..cc5928b
--- /dev/null
+++ b/include/linux/input/kxtj9.h
@@ -0,0 +1,76 @@
+/*
+ * 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
+ */
+
+#ifndef __KXTJ9_H__
+#define __KXTJ9_H__
+
+#define KXTJ9_I2C_ADDR 0x0F
+
+/* These shift values are used to provide consistent output data */
+#define SHIFT_ADJ_2G 4
+#define SHIFT_ADJ_4G 3
+#define SHIFT_ADJ_8G 2
+
+#ifdef __KERNEL__
+struct kxtj9_platform_data {
+ int poll_interval; /* current poll interval (in milli-seconds) */
+ int min_interval; /* minimum poll interval (in milli-seconds) */
+
+ /* by default, x is axis 0, y is axis 1, z is axis 2; these can be
+ changed to account for sensor orientation within the host device */
+ u8 axis_map_x;
+ u8 axis_map_y;
+ u8 axis_map_z;
+
+ /* each axis can be negated to account for sensor orientation within
+ the host device; 1 = negate this axis; 0 = do not negate this axis */
+ bool negate_x;
+ bool negate_y;
+ bool negate_z;
+
+ /* CTRL_REG1: set resolution, g-range, data ready enable */
+ /* Output resolution: 8-bit valid or 12-bit valid */
+ #define RES_8BIT 0
+ #define RES_12BIT (1 << 6)
+ u8 res_12bit;
+ /* Output g-range: +/-2g, 4g, or 8g */
+ #define KXTJ9_G_2G 0
+ #define KXTJ9_G_4G (1 << 3)
+ #define KXTJ9_G_8G (1 << 4)
+ u8 g_range;
+
+ /* DATA_CTRL_REG: controls the output data rate of the part */
+ #define ODR12_5F 0
+ #define ODR25F 1
+ #define ODR50F 2
+ #define ODR100F 3
+ #define ODR200F 4
+ #define ODR400F 5
+ #define ODR800F 6
+ u8 data_odr_init;
+
+ int (*init)(void);
+ void (*exit)(void);
+ int (*power_on)(void);
+ int (*power_off)(void);
+};
+#endif /* __KERNEL__ */
+
+#endif /* __KXTJ9_H__ */
+
--
1.5.4.3


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