From: Chris Hudson <chudson@xxxxxxxxxx>
This is a request for comments for 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, a misc node for IOCTLs, and input nodes for reporting
acceleration data and interrupt status information.
Signed-off-by: Chris Hudson <chudson@xxxxxxxxxx>
---
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/kxte9.c | 998 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/kxte9.h | 95 +++++
4 files changed, 1104 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/kxte9.c
create mode 100644 include/linux/kxte9.h
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 700e93a..f52e141 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -419,6 +419,16 @@ config SENSORS_IT87
This driver can also be built as a module. If so, the module
will be called it87.
+config SENSORS_KXTE9
+ tristate "Kionix KXTE9 tri-axis digital accelerometer"
+ depends on I2C && SYSFS
+ 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.
+
config SENSORS_LM63
tristate "National Semiconductor LM63"
depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 9f46cb0..65ce35e 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
obj-$(CONFIG_SENSORS_IT87) += it87.o
obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
+obj-$(CONFIG_SENSORS_KXTE9) += kxte9.o
obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
obj-$(CONFIG_SENSORS_LIS3_SPI) += lis3lv02d.o lis3lv02d_spi.o
obj-$(CONFIG_SENSORS_LM63) += lm63.o
diff --git a/drivers/hwmon/kxte9.c b/drivers/hwmon/kxte9.c
new file mode 100644
index 0000000..29df50e
--- /dev/null
+++ b/drivers/hwmon/kxte9.c
@@ -0,0 +1,998 @@
+/*
+ * 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/input-polldev.h>
+#include <linux/miscdevice.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
+#define I2C_RETRY_DELAY 5
+#define I2C_RETRIES 5
+/* 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_INTERVAL 8
+#define RES_CURRENT_ODR 9
+#define RESUME_ENTRIES 10
+
+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;
+ struct workqueue_struct *irq_work_queue;
+
+ int hw_initialized;
+ atomic_t enabled;
+ u8 resume_state[RESUME_ENTRIES];
+ int irq;
+};
+
+static struct kxte9_data *kxte9_misc_data;
+
+static int kxte9_i2c_read(struct kxte9_data *te9, u8 *buf, int len)
+{
+ int err;
+ int tries = 0;
+
+ 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,
+ },
+ };
+ do {
+ err = i2c_transfer(te9->client->adapter, msgs, 2);
+ if (err != 2)
+ msleep_interruptible(I2C_RETRY_DELAY);
+ } while ((err != 2) && (++tries < I2C_RETRIES));
+
+ if (err != 2) {
+ dev_err(&te9->client->dev, "read transfer error\n");
+ err = -EIO;
+ } else {
+ err = 0;
+ }
+
+ return err;
+}
+
+static int kxte9_i2c_write(struct kxte9_data *te9, u8 * buf, int len)
+{
+ int err;
+ int tries = 0;
+
+ struct i2c_msg msgs[] = {
+ {
+ .addr = te9->client->addr,
+ .flags = te9->client->flags & I2C_M_TEN,
+ .len = len + 1,
+ .buf = buf,
+ },
+ };
+ do {
+ err = i2c_transfer(te9->client->adapter, msgs, 1);
+ if (err != 1)
+ msleep_interruptible(I2C_RETRY_DELAY);
+ } while ((err != 1) && (++tries < I2C_RETRIES));
+
+ if (err != 1) {
+ dev_err(&te9->client->dev, "write transfer error\n");
+ err = -EIO;
+ } else {
+ err = 0;
+ }
+
+ return err;
+}
+
+static int kxte9_hw_init(struct kxte9_data *te9)
+{
+ int err = -1;
+ 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_nosync(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);
+ queue_work(te9->irq_work_queue, &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);
+ if (!gpio_get_value(te9->pdata->gpio)) {
+ enable_irq(te9->irq);
+ return;
+ }
+
+ 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;
+ /*** DEBUG OUTPUT - REMOVE ***/
+ dev_info(&te9->client->dev, "IRQ TILT [%x]\n", kxte9_resolve_dir(te9, buf[0]));
+ /*** <end> DEBUG OUTPUT - REMOVE ***/
+ }
+ 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;
+ /*** DEBUG OUTPUT - REMOVE ***/
+ dev_info(&te9->client->dev, "IRQ WUF [%x]\n", kxte9_resolve_dir(te9, buf[0]));
+ /*** <end> DEBUG OUTPUT - REMOVE ***/
+ 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->pdata->poll_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->pdata->
+ poll_interval));
+ }
+ }
+ }
+ if ((status & B2SS) > 0) {
+ /*** DEBUG OUTPUT - REMOVE ***/
+ dev_info(&te9->client->dev, "IRQ B2S\n");
+ /*** <end> DEBUG OUTPUT - REMOVE ***/
+ 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->pdata->poll_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->pdata->
+ poll_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 = -1;
+ /* Data bytes from hardware x, y, z */
+ u8 acc_data[3];
+ /* x,y,z hardware values */
+ int hw_d[3] = { 0 };
+ acc_data[0] = XOUT;
+
+ err = kxte9_i2c_read(te9, acc_data, 3);
+ if (err < 0)
+ return err;
+
+ acc_data[0] >>= 2;
+ acc_data[1] >>= 2;
+ acc_data[2] >>= 2;
+
+ hw_d[0] = (int) acc_data[0];
+ hw_d[1] = (int) acc_data[1];
+ hw_d[2] = (int) acc_data[2];
+
+ hw_d[0] -= 32;
+ hw_d[1] -= 32;
+ hw_d[2] -= 32;
+
+ hw_d[0] <<= 6;
+ hw_d[1] <<= 6;
+ hw_d[2] <<= 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]));
+
+ /*** DEBUG OUTPUT - REMOVE ***/
+ dev_info(&te9->client->dev, "x:%d y:%d z:%d\n", xyz[0], xyz[1], xyz[2]);
+ /*** <end> DEBUG OUTPUT - REMOVE ***/
+
+ 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);
+ if (err < 0) {
+ 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->
+ pdata->poll_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 int kxte9_misc_open(struct inode *inode, struct file *file)
+{
+ int err;
+
+ err = nonseekable_open(inode, file);
+ if (err < 0)
+ return err;
+ file->private_data = kxte9_misc_data;
+
+ return 0;
+}
+
+static int kxte9_misc_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ u8 ctrl[2] = { CTRL_REG1, PC1_OFF };
+ int err;
+ int tmp;
+ struct kxte9_data *te9 = file->private_data;
+
+ switch (cmd) {
+ case KXTE9_IOCTL_GET_DELAY:
+ tmp = te9->pdata->poll_interval;
+ if (copy_to_user(argp, &tmp, sizeof(tmp)))
+ return -EFAULT;
+ break;
+ case KXTE9_IOCTL_SET_DELAY:
+ if (copy_from_user(&tmp, argp, sizeof(tmp)))
+ return -EFAULT;
+ if (tmp < 0)
+ return -EINVAL;
+ te9->pdata->poll_interval = max(tmp, te9->pdata->min_interval);
+ err = kxte9_update_odr(te9, te9->pdata->poll_interval);
+ if (err < 0)
+ return err;
+ ctrl[0] = CTRL_REG3;
+ ctrl[1] = te9->resume_state[RES_CTRL_REG1] & 0x18;
+ te9->resume_state[RES_CURRENT_ODR] = ctrl[1];
+ ctrl[1] = (ctrl[1] >> 1) | (ctrl[1] >> 3);
+ err = kxte9_i2c_write(te9, ctrl, 1);
+ if (err < 0)
+ return err;
+ te9->resume_state[RES_CTRL_REG3] = ctrl[1];
+ break;
+ case KXTE9_IOCTL_SET_ENABLE:
+ if (copy_from_user(&tmp, argp, sizeof(tmp)))
+ return -EFAULT;
+ if (tmp < 0 || tmp > 1)
+ return -EINVAL;
+
+ if (tmp)
+ kxte9_enable(te9);
+ else
+ kxte9_disable(te9);
+ break;
+ case KXTE9_IOCTL_GET_ENABLE:
+ tmp = atomic_read(&te9->enabled);
+ if (copy_to_user(argp, &tmp, sizeof(tmp)))
+ return -EINVAL;
+ break;
+ case KXTE9_IOCTL_SET_TILT_ENABLE:
+ if (copy_from_user(&tmp, argp, sizeof(tmp)))
+ return -EFAULT;
+ if (tmp < 0 || tmp > 1)
+ return -EINVAL;
+ if (tmp)
+ te9->resume_state[RES_CTRL_REG1] |= TPE;
+
+ else
+ te9->resume_state[RES_CTRL_REG1] &= (~TPE);
+ ctrl[1] = te9->resume_state[RES_CTRL_REG1];
+ err = kxte9_i2c_write(te9, ctrl, 1);
+ if (err < 0)
+ return err;
+ break;
+ case KXTE9_IOCTL_SET_WAKE_ENABLE:
+ if (copy_from_user(&tmp, argp, sizeof(tmp)))
+ return -EFAULT;
+ if (tmp < 0 || tmp > 1)
+ return -EINVAL;
+ if (tmp) {
+ te9->resume_state[RES_CTRL_REG1] |= (WUFE | B2SE);
+ ctrl[1] = te9->resume_state[RES_CTRL_REG1];
+ err = kxte9_i2c_write(te9, ctrl, 1);
+ if (err < 0)
+ return err;
+ } else {
+ te9->resume_state[RES_CTRL_REG1] &= (~WUFE & ~B2SE);
+ ctrl[1] = te9->resume_state[RES_CTRL_REG1];
+ err = kxte9_i2c_write(te9, ctrl, 1);
+ if (err < 0)
+ return err;
+ }
+ break;
+ case KXTE9_IOCTL_SELF_TEST:
+ if (copy_from_user(&tmp, argp, sizeof(tmp)))
+ return -EFAULT;
+ if (tmp < 0 || tmp > 1)
+ return -EINVAL;
+ ctrl[0] = 0x3A;
+ if (tmp) {
+ ctrl[1] = 0xCA;
+ err = kxte9_i2c_write(te9, ctrl, 1);
+ if (err < 0)
+ return err;
+ } else {
+ ctrl[1] = 0x00;
+ err = kxte9_i2c_write(te9, ctrl, 1);
+ if (err < 0)
+ return err;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct file_operations kxte9_misc_fops = {
+ .owner = THIS_MODULE,
+ .open = kxte9_misc_open,
+ .ioctl = kxte9_misc_ioctl,
+};
+
+static struct miscdevice kxte9_misc_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = NAME,
+ .fops = &kxte9_misc_fops,
+};
+
+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] = { 0 };
+ 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->pdata->poll_interval));
+ mutex_unlock(&te9->lock);
+}
+
+#ifdef KXTE9_OPEN_ENABLE
+int kxte9_input_open(struct input_dev *input)
+{
+ struct kxte9_data *te9 = input_get_drvdata(input);
+
+ return kxte9_enable(te9);
+}
+
+void kxte9_input_close(struct input_dev *dev)
+{
+ struct kxte9_data *te9 = input_get_drvdata(dev);
+
+ kxte9_disable(te9);
+}
+#endif
+
+static int kxte9_validate_pdata(struct kxte9_data *te9)
+{
+ te9->pdata->poll_interval = max(te9->pdata->poll_interval,
+ te9->pdata->min_interval);
+ if (te9->pdata->axis_map_x > 2 ||
+ te9->pdata->axis_map_y > 2 || te9->pdata->axis_map_z > 2 ||
+ te9->pdata->axis_map_x == te9->pdata->axis_map_y ||
+ te9->pdata->axis_map_x == te9->pdata->axis_map_z ||
+ te9->pdata->axis_map_y == te9->pdata->axis_map_z) {
+ dev_err(&te9->client->dev,
+ "invalid axis_map value x:%u y:%u z:%u\n",
+ te9->pdata->axis_map_x, te9->pdata->axis_map_y,
+ te9->pdata->axis_map_z);
+ return -EINVAL;
+ }
+ if (te9->pdata->negate_x > 1 || te9->pdata->negate_y > 1 ||
+ te9->pdata->negate_z > 1) {
+ dev_err(&te9->client->dev,
+ "invalid negate value x:%u y:%u z:%u\n",
+ te9->pdata->negate_x, te9->pdata->negate_y,
+ te9->pdata->negate_z);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+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;
+ }
+#ifdef KXTE9_OPEN_ENABLE
+ te9->input_dev->open = kxte9_input_open;
+ te9->input_dev->close = kxte9_input_close;
+#endif
+ 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 = "accelerometer";
+
+ 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);
+ input_free_device(te9->input_dev);
+}
+
+static int kxte9_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct kxte9_data *te9;
+ int err = -1;
+
+ 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;
+ }
+ 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;
+ }
+
+ mutex_init(&te9->lock);
+ mutex_lock(&te9->lock);
+ te9->client = client;
+
+ INIT_WORK(&te9->irq_work, kxte9_irq_work_func);
+ te9->irq_work_queue = create_singlethread_workqueue("kxte9_wq");
+ if (!te9->irq_work_queue) {
+ err = -ENOMEM;
+ pr_err("%s: cannot create work queue: %d\n", __func__, err);
+ goto err1;
+ }
+ te9->pdata = kmalloc(sizeof(*te9->pdata), GFP_KERNEL);
+ if (te9->pdata == NULL)
+ goto err2;
+ memcpy(te9->pdata, client->dev.platform_data, sizeof(*te9->pdata));
+ err = kxte9_validate_pdata(te9);
+ if (err < 0) {
+ dev_err(&client->dev, "failed to validate platform data\n");
+ goto err3;
+ }
+ i2c_set_clientdata(client, te9);
+ if (te9->pdata->init) {
+ err = te9->pdata->init();
+ if (err < 0)
+ goto err3;
+ }
+
+ 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->resume_state[RES_CURRENT_ODR] = 0;
+
+ err = kxte9_device_power_on(te9);
+ if (err < 0)
+ goto err4;
+ atomic_set(&te9->enabled, 1);
+ err = kxte9_update_odr(te9, te9->pdata->poll_interval);
+ if (err < 0) {
+ dev_err(&client->dev, "update_odr failed\n");
+ goto err5;
+ }
+ err = kxte9_input_init(te9);
+ if (err < 0)
+ goto err5;
+ kxte9_misc_data = te9;
+ err = misc_register(&kxte9_misc_device);
+ if (err < 0) {
+ dev_err(&client->dev, "te9_device register failed\n");
+ goto err6;
+ }
+ kxte9_device_power_off(te9);
+ atomic_set(&te9->enabled, 0);
+ err = request_irq(te9->irq, kxte9_isr,
+ IRQF_TRIGGER_RISING,
+ "kxte9_irq", te9);
+ if (err < 0) {
+ pr_err("%s: request irq failed: %d\n", __func__, err);
+ goto err7;
+ }
+ disable_irq_nosync(te9->irq);
+
+ mutex_unlock(&te9->lock);
+
+ dev_info(&client->dev, "kxte9 probed\n");
+
+ /*** DEBUG ENABLE - REMOVE ***/
+ if (kxte9_enable(te9) != 0)
+ dev_err(&client->dev, "kxte9 enable error\n");
+ /*** <end> DEBUG ENABLE - REMOVE ***/
+
+ return 0;
+
+err7:
+ misc_deregister(&kxte9_misc_device);
+err6:
+ kxte9_input_cleanup(te9);
+err5:
+ kxte9_device_power_off(te9);
+err4:
+ if (te9->pdata->exit)
+ te9->pdata->exit();
+err3:
+ kfree(te9->pdata);
+err2:
+ destroy_workqueue(te9->irq_work_queue);
+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);
+ misc_deregister(&kxte9_misc_device);
+ kxte9_input_cleanup(te9);
+ kxte9_device_power_off(te9);
+ if (te9->pdata->exit)
+ te9->pdata->exit();
+ kfree(te9->pdata);
+ destroy_workqueue(te9->irq_work_queue);
+ kfree(te9);
+
+ return 0;
+}
+
+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);
+}
+
+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)
+{
+ pr_info(KERN_INFO "kxte9 accelerometer driver\n");
+ return i2c_add_driver(&kxte9_driver);
+}
+
+static void __exit kxte9_exit(void)
+{
+ i2c_del_driver(&kxte9_driver);
+ return;
+}
+
+module_init(kxte9_init);
+module_exit(kxte9_exit);
+
+MODULE_DESCRIPTION("KXTE9 accelerometer driver");
+MODULE_AUTHOR("Kionix, Inc.");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/kxte9.h b/include/linux/kxte9.h
new file mode 100644
index 0000000..5337202
--- /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;
+
+ u8 g_range;
+
+ u8 axis_map_x;
+ u8 axis_map_y;
+ u8 axis_map_z;
+
+ u8 negate_x;
+ u8 negate_y;
+ u8 negate_z;
+
+ 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__ */
+
--
1.5.4.3
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