From: Chris Hudson <chudson@xxxxxxxxxx>
This is a request for comments regarding adding driver support for the Kionix
KXTE9 digital tri-axis accelerometer. This part features built-in tilt
position (orientation), wake-up and back-to-sleep algorithms, which can trigger
a user-configurable physical interrupt. The driver uses i2c for device
communication, input nodes for reporting acceleration data and interrupt status
information, and sysfs for userspace communication.
Changes in this version:
*added odr_table description
*removed global misc structure
*removed extraneous retries from i2c read and write functions
*removed extraneous variable assignments
*removed extraneous gpio_get_value conditional in irq_work function
*combined data formatting lines in get_acceleration_data
*migrated all ioctls to sysfs
*removed validate_pdata function
*renamed input_dev from "accelerometer" to "kxte9_accel"
*switched to use kernel workqueue instead of creating a new one
*added some documentation to kxte9.h
Signed-off-by: Chris Hudson <chudson@xxxxxxxxxx>
---
drivers/input/misc/Kconfig | 10 +
drivers/input/misc/Makefile | 1 +
drivers/input/misc/kxte9.c | 910 +++++++++++++++++++++++++++++++++++++++++++
include/linux/kxte9.h | 95 +++++
4 files changed, 1016 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/misc/kxte9.c
create mode 100644 include/linux/kxte9.h
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index a9bb254..a1afad1 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -317,4 +317,14 @@ config INPUT_PCAP
To compile this driver as a module, choose M here: the
module will be called pcap_keys.
+config INPUT_KXTE9
+ tristate "Kionix KXTE9 digital tri-axis accelerometer"
+ depends on I2C
+ help
+ If you say yes here you get support for the Kionix KXTE9 digital
+ tri-axis accelerometer.
+
+ This driver can also be built as a module. If so, the module
+ will be called kxte9.
+
endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index a8b8485..67cae95 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -15,6 +15,7 @@ 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-$(CONFIG_INPUT_KXTE9) += kxte9.o
obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o
obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
diff --git a/drivers/input/misc/kxte9.c b/drivers/input/misc/kxte9.c
new file mode 100644
index 0000000..6e1962e
--- /dev/null
+++ b/drivers/input/misc/kxte9.c
@@ -0,0 +1,910 @@
+/*
+ * Copyright (C) 2009 Kionix, Inc.
+ * Written by Chris Hudson <chudson@xxxxxxxxxx>
+ *
+ * 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/err.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/uaccess.h>
+#include <linux/workqueue.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/kxte9.h>
+
+#define NAME "kxte9"
+#define G_MAX 2000
+/* OUTPUT REGISTERS */
+#define XOUT 0x12
+#define INT_STATUS_REG 0x16
+#define INT_SRC_REG2 0x17
+#define TILT_POS_CUR 0x10
+#define TILT_POS_PRE 0x11
+#define INT_REL 0x1A
+/* CONTROL REGISTERS */
+#define CTRL_REG1 0x1B
+#define CTRL_REG3 0x1D
+#define INT_CTRL1 0x1E
+#define TILT_TIMER 0x28
+#define WUF_TIMER 0x29
+#define B2S_TIMER 0x2A
+#define WUF_THRESH 0x5A
+#define B2S_THRESH 0x5B
+/* CONTROL REGISTER 1 BITS */
+#define PC1_OFF 0x00
+#define PC1_ON 0x80
+/* INTERRUPT SOURCE 1 BITS */
+#define TPS 0x01
+#define WUFS 0x02
+#define B2SS 0x04
+/* INPUT_ABS CONSTANTS */
+#define FUZZ 32
+#define FLAT 32
+/* RESUME STATE INDICES */
+#define RES_CTRL_REG1 0
+#define RES_CTRL_REG3 1
+#define RES_INT_CTRL1 2
+#define RES_TILT_TIMER 3
+#define RES_WUF_TIMER 4
+#define RES_B2S_TIMER 5
+#define RES_WUF_THRESH 6
+#define RES_B2S_THRESH 7
+#define RES_CURRENT_ODR 8
+#define RESUME_ENTRIES 9
+
+/*
+ * The following table lists the maximum appropriate poll interval for each
+ * available output data rate.
+ */
+static struct {
+ unsigned int cutoff;
+ u8 mask;
+} kxte9_odr_table[] = {
+ {
+ 25, ODR125}, {
+ 100, ODR40}, {
+ 334, ODR10}, {
+ 1000, ODR3}, {
+ 0, ODR1},};
+
+struct kxte9_data {
+ struct i2c_client *client;
+ struct kxte9_platform_data *pdata;
+ struct mutex lock;
+ struct delayed_work input_work;
+ struct input_dev *input_dev;
+ struct work_struct irq_work;
+
+ int hw_initialized;
+ atomic_t enabled;
+ u8 resume_state[RESUME_ENTRIES];
+ int res_interval;
+ int irq;
+};
+
+static int kxte9_i2c_read(struct kxte9_data *te9, u8 *buf, int len)
+{
+ int err;
+
+ struct i2c_msg msgs[] = {
+ {
+ .addr = te9->client->addr,
+ .flags = te9->client->flags & I2C_M_TEN,
+ .len = 1,
+ .buf = buf,
+ },
+ {
+ .addr = te9->client->addr,
+ .flags = (te9->client->flags & I2C_M_TEN) | I2C_M_RD,
+ .len = len,
+ .buf = buf,
+ },
+ };
+ err = i2c_transfer(te9->client->adapter, msgs, 2);
+
+ if (err != 2)
+ dev_err(&te9->client->dev, "read transfer error\n");
+ else
+ err = 0;
+
+ return err;
+}
+
+static int kxte9_i2c_write(struct kxte9_data *te9, u8 * buf, int len)
+{
+ int err;
+
+ struct i2c_msg msgs[] = {
+ {
+ .addr = te9->client->addr,
+ .flags = te9->client->flags & I2C_M_TEN,
+ .len = len + 1,
+ .buf = buf,
+ },
+ };
+ err = i2c_transfer(te9->client->adapter, msgs, 1);
+
+ if (err != 1)
+ dev_err(&te9->client->dev, "write transfer error\n");
+ else
+ err = 0;
+
+ return err;
+}
+
+static int kxte9_hw_init(struct kxte9_data *te9)
+{
+ int err;
+ u8 buf[2] = { CTRL_REG1, PC1_OFF };
+
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = CTRL_REG3;
+ buf[1] = te9->resume_state[RES_CTRL_REG3];
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = INT_CTRL1;
+ buf[1] = te9->resume_state[RES_INT_CTRL1];
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = TILT_TIMER;
+ buf[1] = te9->resume_state[RES_TILT_TIMER];
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = WUF_TIMER;
+ buf[1] = te9->resume_state[RES_WUF_TIMER];
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = B2S_TIMER;
+ buf[1] = te9->resume_state[RES_B2S_TIMER];
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = WUF_THRESH;
+ buf[1] = te9->resume_state[RES_WUF_THRESH];
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = B2S_THRESH;
+ buf[1] = te9->resume_state[RES_B2S_THRESH];
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ buf[0] = CTRL_REG1;
+ buf[1] = (te9->resume_state[RES_CTRL_REG1] | PC1_ON);
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ return err;
+ te9->resume_state[RES_CTRL_REG1] = buf[1];
+ te9->hw_initialized = 1;
+
+ return 0;
+}
+
+static void kxte9_device_power_off(struct kxte9_data *te9)
+{
+ int err;
+ u8 buf[2] = { CTRL_REG1, PC1_OFF };
+
+ err = kxte9_i2c_write(te9, buf, 1);
+ if (err < 0)
+ dev_err(&te9->client->dev, "soft power off failed\n");
+ disable_irq(te9->irq);
+ if (te9->pdata->power_off)
+ te9->pdata->power_off();
+ te9->hw_initialized = 0;
+}
+
+static int kxte9_device_power_on(struct kxte9_data *te9)
+{
+ int err;
+
+ if (te9->pdata->power_on) {
+ err = te9->pdata->power_on();
+ if (err < 0)
+ return err;
+ }
+ enable_irq(te9->irq);
+ if (!te9->hw_initialized) {
+ mdelay(110);
+ err = kxte9_hw_init(te9);
+ if (err < 0) {
+ kxte9_device_power_off(te9);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static irqreturn_t kxte9_isr(int irq, void *dev)
+{
+ struct kxte9_data *te9 = dev;
+
+ disable_irq_nosync(irq);
+ schedule_work(&te9->irq_work);
+
+ return IRQ_HANDLED;
+}
+
+static u8 kxte9_resolve_dir(struct kxte9_data *te9, u8 dir)
+{
+ switch (dir) {
+ case 0x20: /* -X */
+ if (te9->pdata->negate_x)
+ dir = 0x10;
+ if (te9->pdata->axis_map_y == 0)
+ dir >>= 2;
+ if (te9->pdata->axis_map_z == 0)
+ dir >>= 4;
+ break;
+ case 0x10: /* +X */
+ if (te9->pdata->negate_x)
+ dir = 0x20;
+ if (te9->pdata->axis_map_y == 0)
+ dir >>= 2;
+ if (te9->pdata->axis_map_z == 0)
+ dir >>= 4;
+ break;
+ case 0x08: /* -Y */
+ if (te9->pdata->negate_y)
+ dir = 0x04;
+ if (te9->pdata->axis_map_x == 1)
+ dir <<= 2;
+ if (te9->pdata->axis_map_z == 1)
+ dir >>= 2;
+ break;
+ case 0x04: /* +Y */
+ if (te9->pdata->negate_y)
+ dir = 0x08;
+ if (te9->pdata->axis_map_x == 1)
+ dir <<= 2;
+ if (te9->pdata->axis_map_z == 1)
+ dir >>= 2;
+ break;
+ case 0x02: /* -Z */
+ if (te9->pdata->negate_z)
+ dir = 0x01;
+ if (te9->pdata->axis_map_x == 2)
+ dir <<= 4;
+ if (te9->pdata->axis_map_y == 2)
+ dir <<= 2;
+ break;
+ case 0x01: /* +Z */
+ if (te9->pdata->negate_z)
+ dir = 0x02;
+ if (te9->pdata->axis_map_x == 2)
+ dir <<= 4;
+ if (te9->pdata->axis_map_y == 2)
+ dir <<= 2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return dir;
+}
+
+static void kxte9_irq_work_func(struct work_struct *work)
+{
+/*
+ * int_status output:
+ * [INT_SRC_REG1][INT_SRC_REG2][TILT_POS_PRE][TILT_POS_CUR]
+ * INT_SRC_REG2, TILT_POS_PRE, and TILT_POS_CUR directions are translated
+ * based on platform data variables.
+ */
+
+ int err;
+ int i;
+ int int_status = 0;
+ u8 status;
+ u8 b2s_comp;
+ u8 wuf_comp;
+ u8 buf[2];
+
+ struct kxte9_data *te9
+ = container_of(work, struct kxte9_data, irq_work);
+
+ status = INT_STATUS_REG;
+ err = kxte9_i2c_read(te9, &status, 1);
+ if (err < 0)
+ dev_err(&te9->client->dev, "read err int source\n");
+ int_status = status << 24;
+ if ((status & TPS) > 0) {
+ buf[0] = TILT_POS_CUR;
+ err = kxte9_i2c_read(te9, buf, 2);
+ if (err < 0)
+ dev_err(&te9->client->dev, "read err tilt dir\n");
+ int_status |= kxte9_resolve_dir(te9, buf[0]);
+ int_status |= (kxte9_resolve_dir(te9, buf[1])) << 8;
+ }
+ if ((status & WUFS) > 0) {
+ buf[0] = INT_SRC_REG2;
+ err = kxte9_i2c_read(te9, buf, 1);
+ if (err < 0)
+ dev_err(&te9->client->dev, "reading err wuf dir\n");
+ int_status |= (kxte9_resolve_dir(te9, buf[0])) << 16;
+ b2s_comp = (te9->resume_state[RES_CTRL_REG3] & 0x0C) >> 2;
+ wuf_comp = te9->resume_state[RES_CTRL_REG3] & 0x03;
+ if (!te9->resume_state[RES_CURRENT_ODR] &&
+ !(te9->resume_state[RES_CTRL_REG1] & ODR125) &&
+ !(b2s_comp & wuf_comp)) {
+ /* set the new poll interval based on wuf odr */
+ for (i = 1; i < ARRAY_SIZE(kxte9_odr_table); i++) {
+ te9->res_interval =
+ kxte9_odr_table[i - 1].cutoff;
+ if (kxte9_odr_table[i].mask == wuf_comp << 3)
+ break;
+ }
+ if (te9->input_dev) {
+ cancel_delayed_work_sync(&te9->input_work);
+ schedule_delayed_work(&te9->input_work,
+ msecs_to_jiffies(te9->
+ res_interval));
+ }
+ }
+ }
+ if ((status & B2SS) > 0) {
+ b2s_comp = (te9->resume_state[RES_CTRL_REG3] & 0x0C) >> 2;
+ wuf_comp = te9->resume_state[RES_CTRL_REG3] & 0x03;
+ if (!te9->resume_state[RES_CURRENT_ODR] &&
+ !(te9->resume_state[RES_CTRL_REG1] & ODR125) &&
+ !(b2s_comp & wuf_comp)) {
+ /* set the new poll interval based on b2s odr */
+ for (i = 1; i < ARRAY_SIZE(kxte9_odr_table); i++) {
+ te9->res_interval =
+ kxte9_odr_table[i - 1].cutoff;
+ if (kxte9_odr_table[i].mask == b2s_comp << 3)
+ break;
+ }
+ if (te9->input_dev) {
+ cancel_delayed_work_sync(&te9->input_work);
+ schedule_delayed_work(&te9->input_work,
+ msecs_to_jiffies(te9->
+ res_interval));
+ }
+ }
+ }
+ input_report_abs(te9->input_dev, ABS_MISC, int_status);
+ input_sync(te9->input_dev);
+ buf[0] = INT_REL;
+ err = kxte9_i2c_read(te9, buf, 1);
+ if (err < 0)
+ dev_err(&te9->client->dev, "error clearing interrupt\n");
+ enable_irq(te9->irq);
+}
+
+static int kxte9_update_odr(struct kxte9_data *te9, int poll_interval)
+{
+ int err = -1;
+ int i;
+ u8 config[2];
+
+ /*
+ * Convert the poll interval into an output data rate configuration
+ * that is as low as possible. The ordering of these checks must be
+ * maintained due to the cascading cut off values - poll intervals are
+ * checked from shortest to longest. At each check, if the next lower
+ * ODR cannot support the current poll interval, we stop searching
+ */
+ for (i = 0; i < ARRAY_SIZE(kxte9_odr_table); i++) {
+ config[1] = kxte9_odr_table[i].mask;
+ if (poll_interval < kxte9_odr_table[i].cutoff)
+ break;
+ }
+
+ if (atomic_read(&te9->enabled)) {
+ config[0] = CTRL_REG1;
+ config[1] |= (te9->resume_state[RES_CTRL_REG1] & ~ODR40);
+ err = kxte9_i2c_write(te9, config, 1);
+ if (err < 0)
+ return err;
+ /*
+ * Latch on input_dev - indicates that kxte9_input_init passed
+ * and this workqueue is available
+ */
+ if (te9->input_dev) {
+ cancel_delayed_work_sync(&te9->input_work);
+ schedule_delayed_work(&te9->input_work,
+ msecs_to_jiffies(poll_interval));
+ }
+ }
+ te9->resume_state[RES_CTRL_REG1] = config[1];
+
+ return 0;
+}
+
+static int kxte9_get_acceleration_data(struct kxte9_data *te9, int *xyz)
+{
+ int err;
+ /* Data bytes from hardware x, y, z */
+ u8 acc_data[3] = { XOUT };
+ /* x,y,z hardware values */
+ int hw_d[3];
+
+ err = kxte9_i2c_read(te9, acc_data, 3);
+ if (err < 0)
+ return err;
+
+ hw_d[0] = ((int)(acc_data[0] >> 2) - 32) << 6;
+ hw_d[1] = ((int)(acc_data[1] >> 2) - 32) << 6;
+ hw_d[2] = ((int)(acc_data[2] >> 2) - 32) << 6;
+
+ xyz[0] = ((te9->pdata->negate_x) ? (-hw_d[te9->pdata->axis_map_x])
+ : (hw_d[te9->pdata->axis_map_x]));
+ xyz[1] = ((te9->pdata->negate_y) ? (-hw_d[te9->pdata->axis_map_y])
+ : (hw_d[te9->pdata->axis_map_y]));
+ xyz[2] = ((te9->pdata->negate_z) ? (-hw_d[te9->pdata->axis_map_z])
+ : (hw_d[te9->pdata->axis_map_z]));
+
+ return err;
+}
+
+static void kxte9_report_values(struct kxte9_data *te9, int *xyz)
+{
+ input_report_abs(te9->input_dev, ABS_X, xyz[0]);
+ input_report_abs(te9->input_dev, ABS_Y, xyz[1]);
+ input_report_abs(te9->input_dev, ABS_Z, xyz[2]);
+ input_sync(te9->input_dev);
+}
+
+static int kxte9_enable(struct kxte9_data *te9)
+{
+ int err;
+ int int_status = 0;
+ u8 buf;
+
+ if (!atomic_cmpxchg(&te9->enabled, 0, 1)) {
+ err = kxte9_device_power_on(te9);
+ buf = INT_REL;
+ err = kxte9_i2c_read(te9, &buf, 1);
+ if (err < 0) {
+ dev_err(&te9->client->dev,
+ "error clearing interrupt: %d\n", err);
+ atomic_set(&te9->enabled, 0);
+ return err;
+ }
+ if ((te9->resume_state[RES_CTRL_REG1] & TPS) > 0) {
+ buf = TILT_POS_CUR;
+ err = kxte9_i2c_read(te9, &buf, 1);
+ if (err < 0)
+ dev_err(&te9->client->dev,
+ "kxte9 error reading current tilt\n");
+ int_status |= kxte9_resolve_dir(te9, buf);
+ input_report_abs(te9->input_dev, ABS_MISC, int_status);
+ input_sync(te9->input_dev);
+ }
+
+ schedule_delayed_work(&te9->input_work, msecs_to_jiffies(te9->
+ res_interval));
+ }
+
+ return 0;
+}
+
+static int kxte9_disable(struct kxte9_data *te9)
+{
+ if (atomic_cmpxchg(&te9->enabled, 1, 0)) {
+ cancel_delayed_work_sync(&te9->input_work);
+ kxte9_device_power_off(te9);
+ }
+
+ return 0;
+}
+
+static void kxte9_input_work_func(struct work_struct *work)
+{
+ struct kxte9_data *te9 = container_of((struct delayed_work *)work,
+ struct kxte9_data, input_work);
+ int xyz[3];
+ int err;
+
+ mutex_lock(&te9->lock);
+ err = kxte9_get_acceleration_data(te9, xyz);
+ if (err < 0)
+ dev_err(&te9->client->dev, "get_acceleration_data failed\n");
+ else
+ kxte9_report_values(te9, xyz);
+ schedule_delayed_work(&te9->input_work,
+ msecs_to_jiffies(te9->res_interval));
+ mutex_unlock(&te9->lock);
+}
+
+static int kxte9_input_open(struct input_dev *input)
+{
+ struct kxte9_data *te9 = input_get_drvdata(input);
+
+ return kxte9_enable(te9);
+}
+
+static void kxte9_input_close(struct input_dev *dev)
+{
+ struct kxte9_data *te9 = input_get_drvdata(dev);
+
+ kxte9_disable(te9);
+}
+
+static int kxte9_input_init(struct kxte9_data *te9)
+{
+ int err;
+
+ INIT_DELAYED_WORK(&te9->input_work, kxte9_input_work_func);
+ te9->input_dev = input_allocate_device();
+ if (!te9->input_dev) {
+ err = -ENOMEM;
+ dev_err(&te9->client->dev, "input device allocate failed\n");
+ goto err0;
+ }
+ te9->input_dev->open = kxte9_input_open;
+ te9->input_dev->close = kxte9_input_close;
+
+ input_set_drvdata(te9->input_dev, te9);
+
+ set_bit(EV_ABS, te9->input_dev->evbit);
+ set_bit(ABS_MISC, te9->input_dev->absbit);
+
+ input_set_abs_params(te9->input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
+ input_set_abs_params(te9->input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
+ input_set_abs_params(te9->input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
+
+ te9->input_dev->name = "kxte9_accel";
+
+ err = input_register_device(te9->input_dev);
+ if (err) {
+ dev_err(&te9->client->dev,
+ "unable to register input polled device %s\n",
+ te9->input_dev->name);
+ goto err1;
+ }
+
+ return 0;
+err1:
+ input_free_device(te9->input_dev);
+err0:
+ return err;
+}
+
+static void kxte9_input_cleanup(struct kxte9_data *te9)
+{
+ input_unregister_device(te9->input_dev);
+}
+
+/* sysfs */
+static ssize_t kxte9_delay_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ return sprintf(buf, "%d\n", te9->res_interval);
+}
+
+static ssize_t kxte9_delay_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ int val = simple_strtoul(buf, NULL, 10);
+ u8 ctrl[2];
+
+ te9->res_interval = max(val, te9->pdata->min_interval);
+ kxte9_update_odr(te9, te9->res_interval);
+ ctrl[0] = CTRL_REG3;
+ ctrl[1] = te9->resume_state[RES_CTRL_REG1] & 0x18;
+ te9->resume_state[RES_CURRENT_ODR] = ctrl[1];
+ /* All ODRs are changed when this method is used. */
+ ctrl[1] = (ctrl[1] >> 1) | (ctrl[1] >> 3);
+ kxte9_i2c_write(te9, ctrl, 1);
+ te9->resume_state[RES_CTRL_REG3] = ctrl[1];
+ return count;
+}
+
+static ssize_t kxte9_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ return sprintf(buf, "%d\n", atomic_read(&te9->enabled));
+}
+
+static ssize_t kxte9_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ int val = simple_strtoul(buf, NULL, 10);
+ if (val)
+ kxte9_enable(te9);
+ else
+ kxte9_disable(te9);
+ return count;
+}
+
+static ssize_t kxte9_tilt_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ u8 ctrl = TILT_POS_CUR;
+
+ if (te9->resume_state[RES_CTRL_REG1] & TPE) {
+ kxte9_i2c_read(te9, &ctrl, 1);
+ return sprintf(buf, "%d\n", kxte9_resolve_dir(te9, ctrl));
+ } else {
+ return sprintf(buf, "%d\n", 0);
+ }
+}
+
+static ssize_t kxte9_tilt_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ int val = simple_strtoul(buf, NULL, 10);
+ u8 ctrl[2] = { CTRL_REG1 };
+ if (val)
+ te9->resume_state[RES_CTRL_REG1] |= TPE;
+ else
+ te9->resume_state[RES_CTRL_REG1] &= (~TPE);
+ ctrl[1] = te9->resume_state[RES_CTRL_REG1];
+ kxte9_i2c_write(te9, ctrl, 1);
+ return count;
+}
+
+static ssize_t kxte9_wake_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ u8 val = te9->resume_state[RES_CTRL_REG1] & WUFE;
+ if (val)
+ return sprintf(buf, "%d\n", 1);
+ else
+ return sprintf(buf, "%d\n", 0);
+}
+
+static ssize_t kxte9_wake_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ int val = simple_strtoul(buf, NULL, 10);
+ u8 ctrl[2] = { CTRL_REG1 };
+ if (val)
+ te9->resume_state[RES_CTRL_REG1] |= (WUFE | B2SE);
+ else
+ te9->resume_state[RES_CTRL_REG1] &= (~WUFE & ~B2SE);
+ ctrl[1] = te9->resume_state[RES_CTRL_REG1];
+ kxte9_i2c_write(te9, ctrl, 1);
+ return count;
+}
+
+static ssize_t kxte9_selftest_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+ int val = simple_strtoul(buf, NULL, 10);
+ u8 ctrl[2] = { 0x3A };
+ if (val)
+ ctrl[1] = 0xCA;
+ else
+ ctrl[1] = 0x00;
+ kxte9_i2c_write(te9, ctrl, 1);
+ return count;
+}
+
+static DEVICE_ATTR(delay, S_IRUGO|S_IWUSR, kxte9_delay_show, kxte9_delay_store);
+static DEVICE_ATTR(enable, S_IRUGO|S_IWUSR, kxte9_enable_show,
+ kxte9_enable_store);
+static DEVICE_ATTR(tilt, S_IRUGO|S_IWUSR, kxte9_tilt_show, kxte9_tilt_store);
+static DEVICE_ATTR(wake, S_IRUGO|S_IWUSR, kxte9_wake_show, kxte9_wake_store);
+static DEVICE_ATTR(selftest, S_IWUSR, NULL, kxte9_selftest_store);
+
+static struct attribute *kxte9_attributes[] = {
+ &dev_attr_delay.attr,
+ &dev_attr_enable.attr,
+ &dev_attr_tilt.attr,
+ &dev_attr_wake.attr,
+ &dev_attr_selftest.attr,
+ NULL
+};
+
+static struct attribute_group kxte9_attribute_group = {
+ .attrs = kxte9_attributes
+};
+/* /sysfs */
+
+static int __devinit kxte9_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int err = -1;
+ struct kxte9_data *te9 = kzalloc(sizeof(*te9), GFP_KERNEL);
+ if (te9 == 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)) {
+ dev_err(&client->dev, "client not i2c capable\n");
+ err = -ENODEV;
+ goto err0;
+ }
+ mutex_init(&te9->lock);
+ mutex_lock(&te9->lock);
+ te9->client = client;
+ i2c_set_clientdata(client, te9);
+
+ INIT_WORK(&te9->irq_work, kxte9_irq_work_func);
+ te9->pdata = kmalloc(sizeof(*te9->pdata), GFP_KERNEL);
+ if (te9->pdata == NULL)
+ goto err1;
+
+ err = sysfs_create_group(&client->dev.kobj, &kxte9_attribute_group);
+ if (err)
+ goto err1;
+
+ memcpy(te9->pdata, client->dev.platform_data, sizeof(*te9->pdata));
+ if (te9->pdata->init) {
+ err = te9->pdata->init();
+ if (err < 0)
+ goto err2;
+ }
+
+ te9->irq = gpio_to_irq(te9->pdata->gpio);
+
+ memset(te9->resume_state, 0, ARRAY_SIZE(te9->resume_state));
+ te9->resume_state[RES_CTRL_REG1] = te9->pdata->ctrl_reg1_init;
+ te9->resume_state[RES_CTRL_REG3] = te9->pdata->engine_odr_init;
+ te9->resume_state[RES_INT_CTRL1] = te9->pdata->int_ctrl_init;
+ te9->resume_state[RES_TILT_TIMER] = te9->pdata->tilt_timer_init;
+ te9->resume_state[RES_WUF_TIMER] = te9->pdata->wuf_timer_init;
+ te9->resume_state[RES_B2S_TIMER] = te9->pdata->b2s_timer_init;
+ te9->resume_state[RES_WUF_THRESH] = te9->pdata->wuf_thresh_init;
+ te9->resume_state[RES_B2S_THRESH] = te9->pdata->b2s_thresh_init;
+ te9->res_interval = te9->pdata->poll_interval;
+
+ err = kxte9_device_power_on(te9);
+ if (err < 0)
+ goto err3;
+ atomic_set(&te9->enabled, 1);
+ err = kxte9_update_odr(te9, te9->res_interval);
+ if (err < 0) {
+ dev_err(&client->dev, "update_odr failed\n");
+ goto err4;
+ }
+ err = kxte9_input_init(te9);
+ if (err < 0)
+ goto err4;
+
+ kxte9_device_power_off(te9);
+ atomic_set(&te9->enabled, 0);
+ err = request_irq(te9->irq, kxte9_isr,
+ IRQF_TRIGGER_RISING | IRQF_DISABLED, "kxte9_irq", te9);
+ if (err < 0) {
+ pr_err("%s: request irq failed: %d\n", __func__, err);
+ goto err5;
+ }
+ disable_irq_nosync(te9->irq);
+
+ mutex_unlock(&te9->lock);
+
+ return 0;
+
+err5:
+ kxte9_input_cleanup(te9);
+err4:
+ kxte9_device_power_off(te9);
+err3:
+ if (te9->pdata->exit)
+ te9->pdata->exit();
+err2:
+ kfree(te9->pdata);
+ sysfs_remove_group(&client->dev.kobj, &kxte9_attribute_group);
+err1:
+ mutex_unlock(&te9->lock);
+ kfree(te9);
+err0:
+ return err;
+}
+
+static int __devexit kxte9_remove(struct i2c_client *client)
+{
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+
+ free_irq(te9->irq, te9);
+ gpio_free(te9->pdata->gpio);
+ kxte9_input_cleanup(te9);
+ kxte9_device_power_off(te9);
+ if (te9->pdata->exit)
+ te9->pdata->exit();
+ kfree(te9->pdata);
+ sysfs_remove_group(&client->dev.kobj, &kxte9_attribute_group);
+ kfree(te9);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int kxte9_resume(struct i2c_client *client)
+{
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+
+ return kxte9_enable(te9);
+}
+
+static int kxte9_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ struct kxte9_data *te9 = i2c_get_clientdata(client);
+
+ return kxte9_disable(te9);
+}
+#endif
+
+static const struct i2c_device_id kxte9_id[] = {
+ {NAME, 0},
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, kxte9_id);
+
+static struct i2c_driver kxte9_driver = {
+ .driver = {
+ .name = NAME,
+ },
+ .probe = kxte9_probe,
+ .remove = __devexit_p(kxte9_remove),
+ .resume = kxte9_resume,
+ .suspend = kxte9_suspend,
+ .id_table = kxte9_id,
+};
+
+static int __init kxte9_init(void)
+{
+ return i2c_add_driver(&kxte9_driver);
+}
+
+static void __exit kxte9_exit(void)
+{
+ i2c_del_driver(&kxte9_driver);
+}
+
+module_init(kxte9_init);
+module_exit(kxte9_exit);
+
+MODULE_DESCRIPTION("KXTE9 accelerometer driver");
+MODULE_AUTHOR("Chris Hudson <chudson@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/kxte9.h b/include/linux/kxte9.h
new file mode 100644
index 0000000..77b1a69
--- /dev/null
+++ b/include/linux/kxte9.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2009, Kionix, Inc. All Rights Reserved.
+ * Written by Chris Hudson <chudson@xxxxxxxxxx>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/ioctl.h> /* For IOCTL macros */
+
+#ifndef __KXTE9_H__
+#define __KXTE9_H__
+
+#define KXTE9_IOCTL_BASE 77
+/** The following define the IOCTL command values via the ioctl macros */
+#define KXTE9_IOCTL_SET_DELAY _IOW(KXTE9_IOCTL_BASE, 0, int)
+#define KXTE9_IOCTL_GET_DELAY _IOR(KXTE9_IOCTL_BASE, 1, int)
+#define KXTE9_IOCTL_SET_ENABLE _IOW(KXTE9_IOCTL_BASE, 2, int)
+#define KXTE9_IOCTL_GET_ENABLE _IOR(KXTE9_IOCTL_BASE, 3, int)
+#define KXTE9_IOCTL_SET_TILT_ENABLE _IOW(KXTE9_IOCTL_BASE, 5, int)
+#define KXTE9_IOCTL_SET_B2S_ENABLE _IOW(KXTE9_IOCTL_BASE, 6, int)
+#define KXTE9_IOCTL_SET_WAKE_ENABLE _IOW(KXTE9_IOCTL_BASE, 7, int)
+#define KXTE9_IOCTL_SELF_TEST _IOW(KXTE9_IOCTL_BASE, 8, int)
+
+#define KXTE9_I2C_ADDR 0x0F
+/* CONTROL REGISTER 1 BITS */
+#define TPE 0x01 /* tilt position function enable bit */
+#define WUFE 0x02 /* wake-up function enable bit */
+#define B2SE 0x04 /* back-to-sleep function enable bit */
+#define ODR125 0x20 /* 125Hz ODR mode */
+#define ODR40 0x18 /* initial ODR masks */
+#define ODR10 0x10
+#define ODR3 0x08
+#define ODR1 0x00
+/* CONTROL REGISTER 3 BITS */
+#define OB2S40 0x0C /* back-to-sleep ODR masks */
+#define OB2S10 0x08
+#define OB2S3 0x04
+#define OB2S1 0x00
+#define OWUF40 0x03 /* wake-up ODR masks */
+#define OWUF10 0x02
+#define OWUF3 0x01
+#define OWUF1 0x00
+/* INTERRUPT CONTROL REGISTER 1 BITS */
+#define KXTE9_IEN 0x10 /* interrupt enable */
+#define KXTE9_IEA 0x08 /* interrupt polarity */
+#define KXTE9_IEL 0x04 /* interrupt response */
+
+#ifdef __KERNEL__
+struct kxte9_platform_data {
+ int poll_interval;
+ int min_interval;
+ /* the desired g-range, in milli-g (always 2000 for kxte9) */
+ u8 g_range;
+ /* used to compensate for alternate device placement within the host */
+ u8 axis_map_x;
+ u8 axis_map_y;
+ u8 axis_map_z;
+ /* used to compensate for alternate device placement within the host */
+ u8 negate_x;
+ u8 negate_y;
+ u8 negate_z;
+
+ /* initial configuration values, set during board configuration */
+ u8 ctrl_reg1_init;
+ u8 engine_odr_init;
+ u8 int_ctrl_init;
+ u8 tilt_timer_init;
+ u8 wuf_timer_init;
+ u8 b2s_timer_init;
+ u8 wuf_thresh_init;
+ u8 b2s_thresh_init;
+
+ int (*init)(void);
+ void (*exit)(void);
+ int (*power_on)(void);
+ int (*power_off)(void);
+
+ int gpio;
+};
+#endif /* __KERNEL__ */
+
+#endif /* __KXTE9_H__ */
+
