branch Attitude Adjustment

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 957 insertions, 0 deletions

diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c b/target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c
new file mode 100644
index 000000000..dc6602a8e
--- /dev/null
+++ b/target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c
@@ -0,0 +1,957 @@
+/* Linux kernel driver for the ST LIS302D 3-axis accelerometer
+ *
+ * Copyright (C) 2007-2008 by Openmoko, Inc.
+ * Author: Harald Welte <laforge@openmoko.org>
+ *         converted to private bitbang by:
+ *         Andy Green <andy@openmoko.com>
+ *         ability to set acceleration threshold added by:
+ *         Simon Kagstrom <simon.kagstrom@gmail.com>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * TODO
+ * 	* statistics for overflow events
+ * 	* configuration interface (sysfs) for
+ * 		* enable/disable x/y/z axis data ready
+ * 		* enable/disable resume from freee fall / click
+ * 		* free fall / click parameters
+ * 		* high pass filter parameters
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/sysfs.h>
+#include <linux/spi/spi.h>
+
+#include <linux/lis302dl.h>
+
+/* Utility functions */
+static u8 __reg_read(struct lis302dl_info *lis, u8 reg)
+{
+	struct spi_message msg;
+	struct spi_transfer t;
+	u8 data[2] = {0xc0 | reg};
+	int rc;
+
+	spi_message_init(&msg);
+	memset(&t, 0, sizeof t);
+	t.len = 2;
+	spi_message_add_tail(&t, &msg);
+	t.tx_buf = &data[0];
+	t.rx_buf = &data[0];
+
+	/* Should complete without blocking */
+	rc = spi_non_blocking_transfer(lis->spi, &msg);
+	if (rc < 0) {
+		dev_err(lis->dev, "Error reading register\n");
+		return rc;
+	}
+
+	return data[1];
+}
+
+static void __reg_write(struct lis302dl_info *lis, u8 reg, u8 val)
+{
+	struct spi_message msg;
+	struct spi_transfer t;
+	u8 data[2] = {reg, val};
+
+	spi_message_init(&msg);
+	memset(&t, 0, sizeof t);
+	t.len = 2;
+	spi_message_add_tail(&t, &msg);
+	t.tx_buf = &data[0];
+	t.rx_buf = &data[0];
+
+	/* Completes without blocking */
+	if (spi_non_blocking_transfer(lis->spi, &msg) < 0)
+		dev_err(lis->dev, "Error writing register\n");
+}
+
+static void __reg_set_bit_mask(struct lis302dl_info *lis, u8 reg, u8 mask,
+		u8 val)
+{
+	u_int8_t tmp;
+
+	val &= mask;
+
+	tmp = __reg_read(lis, reg);
+	tmp &= ~mask;
+	tmp |= val;
+	__reg_write(lis, reg, tmp);
+}
+
+static int __ms_to_duration(struct lis302dl_info *lis, int ms)
+{
+	/* If we have 400 ms sampling rate, the stepping is 2.5 ms,
+	 * on 100 ms the stepping is 10ms */
+	if (lis->flags & LIS302DL_F_DR)
+		return min((ms * 10) / 25, 637);
+
+	return min(ms / 10, 2550);
+}
+
+static int __duration_to_ms(struct lis302dl_info *lis, int duration)
+{
+	if (lis->flags & LIS302DL_F_DR)
+		return (duration * 25) / 10;
+
+	return duration * 10;
+}
+
+static u8 __mg_to_threshold(struct lis302dl_info *lis, int mg)
+{
+	/* If FS is set each bit is 71mg, otherwise 18mg. The THS register
+	 * has 7 bits for the threshold value */
+	if (lis->flags & LIS302DL_F_FS)
+		return min(mg / 71, 127);
+
+	return min(mg / 18, 127);
+}
+
+static int __threshold_to_mg(struct lis302dl_info *lis, u8 threshold)
+{
+	if (lis->flags & LIS302DL_F_FS)
+		return threshold * 71;
+
+	return threshold * 18;
+}
+
+/* interrupt handling related */
+
+enum lis302dl_intmode {
+	LIS302DL_INTMODE_GND		= 0x00,
+	LIS302DL_INTMODE_FF_WU_1	= 0x01,
+	LIS302DL_INTMODE_FF_WU_2	= 0x02,
+	LIS302DL_INTMODE_FF_WU_12	= 0x03,
+	LIS302DL_INTMODE_DATA_READY	= 0x04,
+	LIS302DL_INTMODE_CLICK		= 0x07,
+};
+
+static void __lis302dl_int_mode(struct device *dev, int int_pin,
+			      enum lis302dl_intmode mode)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+
+	switch (int_pin) {
+	case 1:
+		__reg_set_bit_mask(lis, LIS302DL_REG_CTRL3, 0x07, mode);
+		break;
+	case 2:
+		__reg_set_bit_mask(lis, LIS302DL_REG_CTRL3, 0x38, mode << 3);
+		break;
+	default:
+		BUG();
+	}
+}
+
+static void __enable_wakeup(struct lis302dl_info *lis)
+{
+	__reg_write(lis, LIS302DL_REG_CTRL1, 0);
+
+	/* First zero to get to a known state */
+	__reg_write(lis, LIS302DL_REG_FF_WU_CFG_1, LIS302DL_FFWUCFG_XHIE |
+			LIS302DL_FFWUCFG_YHIE | LIS302DL_FFWUCFG_ZHIE |
+			LIS302DL_FFWUCFG_LIR);
+	__reg_write(lis, LIS302DL_REG_FF_WU_THS_1,
+			__mg_to_threshold(lis, lis->wakeup.threshold));
+	__reg_write(lis, LIS302DL_REG_FF_WU_DURATION_1,
+			__ms_to_duration(lis, lis->wakeup.duration));
+
+	/* Route the interrupt for wakeup */
+	__lis302dl_int_mode(lis->dev, 1,
+			LIS302DL_INTMODE_FF_WU_1);
+
+	__reg_read(lis, LIS302DL_REG_HP_FILTER_RESET);
+	__reg_read(lis, LIS302DL_REG_OUT_X);
+	__reg_read(lis, LIS302DL_REG_OUT_Y);
+	__reg_read(lis, LIS302DL_REG_OUT_Z);
+	__reg_read(lis, LIS302DL_REG_STATUS);
+	__reg_read(lis, LIS302DL_REG_FF_WU_SRC_1);
+	__reg_read(lis, LIS302DL_REG_FF_WU_SRC_2);
+	__reg_write(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_PD | 7);
+}
+
+static void __enable_data_collection(struct lis302dl_info *lis)
+{
+	u_int8_t ctrl1 = LIS302DL_CTRL1_PD | LIS302DL_CTRL1_Xen |
+			 LIS302DL_CTRL1_Yen | LIS302DL_CTRL1_Zen;
+
+	/* make sure we're powered up and generate data ready */
+	__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, ctrl1, ctrl1);
+
+	/* If the threshold is zero, let the device generated an interrupt
+	 * on each datum */
+	if (lis->threshold == 0) {
+		__reg_write(lis, LIS302DL_REG_CTRL2, 0);
+		__lis302dl_int_mode(lis->dev, 1, LIS302DL_INTMODE_DATA_READY);
+		__lis302dl_int_mode(lis->dev, 2, LIS302DL_INTMODE_DATA_READY);
+	} else {
+		__reg_write(lis, LIS302DL_REG_CTRL2,
+				LIS302DL_CTRL2_HPFF1);
+		__reg_write(lis, LIS302DL_REG_FF_WU_THS_1,
+				__mg_to_threshold(lis, lis->threshold));
+		__reg_write(lis, LIS302DL_REG_FF_WU_DURATION_1,
+				__ms_to_duration(lis, lis->duration));
+
+		/* Clear the HP filter "starting point" */
+		__reg_read(lis, LIS302DL_REG_HP_FILTER_RESET);
+		__reg_write(lis, LIS302DL_REG_FF_WU_CFG_1,
+				LIS302DL_FFWUCFG_XHIE | LIS302DL_FFWUCFG_YHIE |
+				LIS302DL_FFWUCFG_ZHIE | LIS302DL_FFWUCFG_LIR);
+		__lis302dl_int_mode(lis->dev, 1, LIS302DL_INTMODE_FF_WU_12);
+		__lis302dl_int_mode(lis->dev, 2, LIS302DL_INTMODE_FF_WU_12);
+	}
+}
+
+#if 0
+static void _report_btn_single(struct input_dev *inp, int btn)
+{
+	input_report_key(inp, btn, 1);
+	input_sync(inp);
+	input_report_key(inp, btn, 0);
+}
+
+static void _report_btn_double(struct input_dev *inp, int btn)
+{
+	input_report_key(inp, btn, 1);
+	input_sync(inp);
+	input_report_key(inp, btn, 0);
+	input_sync(inp);
+	input_report_key(inp, btn, 1);
+	input_sync(inp);
+	input_report_key(inp, btn, 0);
+}
+#endif
+
+
+static void lis302dl_bitbang_read_sample(struct lis302dl_info *lis)
+{
+	u8 data[(LIS302DL_REG_OUT_Z - LIS302DL_REG_STATUS) + 2] = {0xC0 | LIS302DL_REG_STATUS};
+	u8 *read = data + 1;
+	unsigned long flags;
+	int mg_per_sample = __threshold_to_mg(lis, 1);
+	struct spi_message msg;
+	struct spi_transfer t;
+
+	spi_message_init(&msg);
+	memset(&t, 0, sizeof t);
+	t.len = sizeof(data);
+	spi_message_add_tail(&t, &msg);
+	t.tx_buf = &data[0];
+	t.rx_buf = &data[0];
+
+	/* grab the set of register containing status and XYZ data */
+
+	local_irq_save(flags);
+
+	/* Should complete without blocking */
+	if (spi_non_blocking_transfer(lis->spi, &msg) < 0)
+		dev_err(lis->dev, "Error reading registers\n");
+
+	local_irq_restore(flags);
+
+	/*
+	 * at the minute the test below fails 50% of the time due to
+	 * a problem with level interrupts causing ISRs to get called twice.
+	 * This is a workaround for that, but actually this test is still
+	 * valid and the information can be used for overrrun stats.
+	 */
+
+	/* has any kind of overrun been observed by the lis302dl? */
+	if (read[0] & (LIS302DL_STATUS_XOR |
+		       LIS302DL_STATUS_YOR |
+		       LIS302DL_STATUS_ZOR))
+		lis->overruns++;
+
+	/* we have a valid sample set? */
+	if (read[0] & LIS302DL_STATUS_XYZDA) {
+		input_report_abs(lis->input_dev, ABS_X, mg_per_sample *
+			    (s8)read[LIS302DL_REG_OUT_X - LIS302DL_REG_STATUS]);
+		input_report_abs(lis->input_dev, ABS_Y, mg_per_sample *
+			    (s8)read[LIS302DL_REG_OUT_Y - LIS302DL_REG_STATUS]);
+		input_report_abs(lis->input_dev, ABS_Z, mg_per_sample *
+			    (s8)read[LIS302DL_REG_OUT_Z - LIS302DL_REG_STATUS]);
+
+		input_sync(lis->input_dev);
+	}
+
+	if (lis->threshold)
+		/* acknowledge the wakeup source */
+		__reg_read(lis,	LIS302DL_REG_FF_WU_SRC_1);
+}
+
+static irqreturn_t lis302dl_interrupt(int irq, void *_lis)
+{
+	struct lis302dl_info *lis = _lis;
+
+	lis302dl_bitbang_read_sample(lis);
+	return IRQ_HANDLED;
+}
+
+/* sysfs */
+
+static ssize_t show_overruns(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", lis->overruns);
+}
+
+static DEVICE_ATTR(overruns, S_IRUGO, show_overruns, NULL);
+
+static ssize_t show_rate(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	u8 ctrl1;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	ctrl1 = __reg_read(lis, LIS302DL_REG_CTRL1);
+	local_irq_restore(flags);
+
+	return sprintf(buf, "%d\n", ctrl1 & LIS302DL_CTRL1_DR ? 400 : 100);
+}
+
+static ssize_t set_rate(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	if (!strcmp(buf, "400\n")) {
+		__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_DR,
+				 LIS302DL_CTRL1_DR);
+		lis->flags |= LIS302DL_F_DR;
+	} else {
+		__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_DR,
+				0);
+		lis->flags &= ~LIS302DL_F_DR;
+	}
+	local_irq_restore(flags);
+
+	return count;
+}
+
+static DEVICE_ATTR(sample_rate, S_IRUGO | S_IWUSR, show_rate, set_rate);
+
+static ssize_t show_scale(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	u_int8_t ctrl1;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	ctrl1 = __reg_read(lis, LIS302DL_REG_CTRL1);
+	local_irq_restore(flags);
+
+	return sprintf(buf, "%s\n", ctrl1 & LIS302DL_CTRL1_FS ? "9.2" : "2.3");
+}
+
+static ssize_t set_scale(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	if (!strcmp(buf, "9.2\n")) {
+		__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_FS,
+				 LIS302DL_CTRL1_FS);
+		lis->flags |= LIS302DL_F_FS;
+	} else {
+		__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_FS,
+				0);
+		lis->flags &= ~LIS302DL_F_FS;
+	}
+
+	if (lis->flags & LIS302DL_F_INPUT_OPEN)
+		__enable_data_collection(lis);
+
+	local_irq_restore(flags);
+
+	return count;
+}
+
+static DEVICE_ATTR(full_scale, S_IRUGO | S_IWUSR, show_scale, set_scale);
+
+static ssize_t show_threshold(struct device *dev, struct device_attribute *attr,
+		 char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+
+	/* Display the device view of the threshold setting */
+	return sprintf(buf, "%d\n", __threshold_to_mg(lis,
+			__mg_to_threshold(lis, lis->threshold)));
+}
+
+static ssize_t set_threshold(struct device *dev, struct device_attribute *attr,
+		 const char *buf, size_t count)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	unsigned int val;
+
+	if (sscanf(buf, "%u\n", &val) != 1)
+		return -EINVAL;
+	/* 8g is the maximum if FS is 1 */
+	if (val > 8000)
+		return -ERANGE;
+
+	/* Set the threshold and write it out if the device is used */
+	lis->threshold = val;
+
+	if (lis->flags & LIS302DL_F_INPUT_OPEN) {
+		unsigned long flags;
+
+		local_irq_save(flags);
+		__enable_data_collection(lis);
+		local_irq_restore(flags);
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR(threshold, S_IRUGO | S_IWUSR, show_threshold, set_threshold);
+
+static ssize_t show_duration(struct device *dev, struct device_attribute *attr,
+		 char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", __duration_to_ms(lis,
+			__ms_to_duration(lis, lis->duration)));
+}
+
+static ssize_t set_duration(struct device *dev, struct device_attribute *attr,
+		 const char *buf, size_t count)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	unsigned int val;
+
+	if (sscanf(buf, "%u\n", &val) != 1)
+		return -EINVAL;
+	if (val > 2550)
+		return -ERANGE;
+
+	lis->duration = val;
+	if (lis->flags & LIS302DL_F_INPUT_OPEN)
+		__reg_write(lis, LIS302DL_REG_FF_WU_DURATION_1,
+				__ms_to_duration(lis, lis->duration));
+
+	return count;
+}
+
+static DEVICE_ATTR(duration, S_IRUGO | S_IWUSR, show_duration, set_duration);
+
+static ssize_t lis302dl_dump(struct device *dev, struct device_attribute *attr,
+								      char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	int n = 0;
+	u8 reg[0x40];
+	char *end = buf;
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	for (n = 0; n < sizeof(reg); n++)
+		reg[n] = __reg_read(lis, n);
+
+	local_irq_restore(flags);
+
+	for (n = 0; n < sizeof(reg); n += 16) {
+		hex_dump_to_buffer(reg + n, 16, 16, 1, end, 128, 0);
+		end += strlen(end);
+		*end++ = '\n';
+		*end++ = '\0';
+	}
+
+	return end - buf;
+}
+static DEVICE_ATTR(dump, S_IRUGO, lis302dl_dump, NULL);
+
+/* Configure freefall/wakeup interrupts */
+static ssize_t set_wakeup_threshold(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	unsigned int threshold;
+
+	if (sscanf(buf, "%u\n", &threshold) != 1)
+		return -EINVAL;
+
+	if (threshold > 8000)
+		return -ERANGE;
+
+	/* Zero turns the feature off */
+	if (threshold == 0) {
+		if (lis->flags & LIS302DL_F_IRQ_WAKE) {
+			disable_irq_wake(lis->pdata->interrupt);
+			lis->flags &= ~LIS302DL_F_IRQ_WAKE;
+		}
+
+		return count;
+	}
+
+	lis->wakeup.threshold = threshold;
+
+	if (!(lis->flags & LIS302DL_F_IRQ_WAKE)) {
+		enable_irq_wake(lis->pdata->interrupt);
+		lis->flags |= LIS302DL_F_IRQ_WAKE;
+	}
+
+	return count;
+}
+
+static ssize_t show_wakeup_threshold(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+
+	/* All events off? */
+	if (lis->wakeup.threshold == 0)
+		return sprintf(buf, "off\n");
+
+	return sprintf(buf, "%u\n", lis->wakeup.threshold);
+}
+
+static DEVICE_ATTR(wakeup_threshold, S_IRUGO | S_IWUSR, show_wakeup_threshold,
+		set_wakeup_threshold);
+
+static ssize_t set_wakeup_duration(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+	unsigned int duration;
+
+	if (sscanf(buf, "%u\n", &duration) != 1)
+		return -EINVAL;
+
+	if (duration > 2550)
+		return -ERANGE;
+
+	lis->wakeup.duration = duration;
+
+	return count;
+}
+
+static ssize_t show_wakeup_duration(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", lis->wakeup.duration);
+}
+
+static DEVICE_ATTR(wakeup_duration, S_IRUGO | S_IWUSR, show_wakeup_duration,
+		set_wakeup_duration);
+
+static struct attribute *lis302dl_sysfs_entries[] = {
+	&dev_attr_sample_rate.attr,
+	&dev_attr_full_scale.attr,
+	&dev_attr_threshold.attr,
+	&dev_attr_duration.attr,
+	&dev_attr_dump.attr,
+	&dev_attr_wakeup_threshold.attr,
+	&dev_attr_wakeup_duration.attr,
+	&dev_attr_overruns.attr,
+	NULL
+};
+
+static struct attribute_group lis302dl_attr_group = {
+	.name	= NULL,
+	.attrs	= lis302dl_sysfs_entries,
+};
+
+/* input device handling and driver core interaction */
+
+static int lis302dl_input_open(struct input_dev *inp)
+{
+	struct lis302dl_info *lis = input_get_drvdata(inp);
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	__enable_data_collection(lis);
+	lis->flags |= LIS302DL_F_INPUT_OPEN;
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static void lis302dl_input_close(struct input_dev *inp)
+{
+	struct lis302dl_info *lis = input_get_drvdata(inp);
+	u_int8_t ctrl1 = LIS302DL_CTRL1_Xen | LIS302DL_CTRL1_Yen |
+			 LIS302DL_CTRL1_Zen;
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	/* since the input core already serializes access and makes sure we
+	 * only see close() for the close of the last user, we can safely
+	 * disable the data ready events */
+	__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, ctrl1, 0x00);
+	lis->flags &= ~LIS302DL_F_INPUT_OPEN;
+
+	/* however, don't power down the whole device if still needed */
+	if (!(lis->flags & LIS302DL_F_WUP_FF ||
+	      lis->flags & LIS302DL_F_WUP_CLICK)) {
+		__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_PD,
+				 0x00);
+	}
+	local_irq_restore(flags);
+}
+
+/* get the device to reload its coefficients from EEPROM and wait for it
+ * to complete
+ */
+
+static int __lis302dl_reset_device(struct lis302dl_info *lis)
+{
+	int timeout = 10;
+
+	__reg_write(lis, LIS302DL_REG_CTRL2,
+			LIS302DL_CTRL2_BOOT | LIS302DL_CTRL2_FDS);
+
+	while ((__reg_read(lis, LIS302DL_REG_CTRL2)
+			& LIS302DL_CTRL2_BOOT) && (timeout--))
+		mdelay(1);
+
+	return !!(timeout < 0);
+}
+
+static int __devinit lis302dl_probe(struct spi_device *spi)
+{
+	int rc;
+	struct lis302dl_info *lis;
+	u_int8_t wai;
+	unsigned long flags;
+	struct lis302dl_platform_data *pdata = spi->dev.platform_data;
+
+	spi->mode = SPI_MODE_3;
+	rc = spi_setup(spi);
+	if (rc < 0) {
+		dev_err(&spi->dev, "spi_setup failed\n");
+		return rc;
+	}
+
+	lis = kzalloc(sizeof(*lis), GFP_KERNEL);
+	if (!lis)
+		return -ENOMEM;
+
+	lis->dev = &spi->dev;
+	lis->spi = spi;
+
+	dev_set_drvdata(lis->dev, lis);
+
+	lis->pdata = pdata;
+
+	rc = sysfs_create_group(&lis->dev->kobj, &lis302dl_attr_group);
+	if (rc) {
+		dev_err(lis->dev, "error creating sysfs group\n");
+		goto bail_free_lis;
+	}
+
+	/* initialize input layer details */
+	lis->input_dev = input_allocate_device();
+	if (!lis->input_dev) {
+		dev_err(lis->dev, "Unable to allocate input device\n");
+		goto bail_sysfs;
+	}
+
+	input_set_drvdata(lis->input_dev, lis);
+	lis->input_dev->name = pdata->name;
+	 /* SPI Bus not defined as a valid bus for input subsystem*/
+	lis->input_dev->id.bustype = BUS_I2C; /* lie about it */
+	lis->input_dev->open = lis302dl_input_open;
+	lis->input_dev->close = lis302dl_input_close;
+
+	rc = input_register_device(lis->input_dev);
+	if (rc) {
+		dev_err(lis->dev, "error %d registering input device\n", rc);
+		goto bail_inp_dev;
+	}
+
+	local_irq_save(flags);
+	/* Configure our IO */
+	(lis->pdata->lis302dl_suspend_io)(lis, 1);
+
+	wai = __reg_read(lis, LIS302DL_REG_WHO_AM_I);
+	if (wai != LIS302DL_WHO_AM_I_MAGIC) {
+		dev_err(lis->dev, "unknown who_am_i signature 0x%02x\n", wai);
+		dev_set_drvdata(lis->dev, NULL);
+		rc = -ENODEV;
+		local_irq_restore(flags);
+		goto bail_inp_reg;
+	}
+
+	set_bit(EV_ABS, lis->input_dev->evbit);
+	input_set_abs_params(lis->input_dev, ABS_X, 0, 0, 0, 0);
+	input_set_abs_params(lis->input_dev, ABS_Y, 0, 0, 0, 0);
+	input_set_abs_params(lis->input_dev, ABS_Z, 0, 0, 0, 0);
+
+	lis->threshold = 0;
+	lis->duration = 0;
+	memset(&lis->wakeup, 0, sizeof(lis->wakeup));
+
+	if (__lis302dl_reset_device(lis))
+		dev_err(lis->dev, "device BOOT reload failed\n");
+
+	/* force us powered */
+	__reg_write(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_PD |
+			LIS302DL_CTRL1_Xen |
+			LIS302DL_CTRL1_Yen |
+			LIS302DL_CTRL1_Zen);
+	mdelay(1);
+
+	__reg_write(lis, LIS302DL_REG_CTRL2, 0);
+	__reg_write(lis, LIS302DL_REG_CTRL3,
+			LIS302DL_CTRL3_PP_OD | LIS302DL_CTRL3_IHL);
+	__reg_write(lis, LIS302DL_REG_FF_WU_THS_1, 0x0);
+	__reg_write(lis, LIS302DL_REG_FF_WU_DURATION_1, 0x00);
+	__reg_write(lis, LIS302DL_REG_FF_WU_CFG_1, 0x0);
+
+	/* start off in powered down mode; we power up when someone opens us */
+	__reg_write(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_Xen |
+			LIS302DL_CTRL1_Yen | LIS302DL_CTRL1_Zen);
+
+	if (pdata->open_drain)
+		/* switch interrupt to open collector, active-low */
+		__reg_write(lis, LIS302DL_REG_CTRL3,
+				LIS302DL_CTRL3_PP_OD | LIS302DL_CTRL3_IHL);
+	else
+		/* push-pull, active-low */
+		__reg_write(lis, LIS302DL_REG_CTRL3, LIS302DL_CTRL3_IHL);
+
+	__lis302dl_int_mode(lis->dev, 1, LIS302DL_INTMODE_GND);
+	__lis302dl_int_mode(lis->dev, 2, LIS302DL_INTMODE_GND);
+
+	__reg_read(lis, LIS302DL_REG_STATUS);
+	__reg_read(lis, LIS302DL_REG_FF_WU_SRC_1);
+	__reg_read(lis, LIS302DL_REG_FF_WU_SRC_2);
+	__reg_read(lis, LIS302DL_REG_CLICK_SRC);
+	local_irq_restore(flags);
+
+	dev_info(lis->dev, "Found %s\n", pdata->name);
+
+	lis->pdata = pdata;
+
+	set_irq_handler(lis->pdata->interrupt, handle_level_irq);
+
+	rc = request_irq(lis->pdata->interrupt, lis302dl_interrupt,
+			 IRQF_TRIGGER_LOW, "lis302dl", lis);
+
+	if (rc < 0) {
+		dev_err(lis->dev, "error requesting IRQ %d\n",
+			lis->pdata->interrupt);
+		goto bail_inp_reg;
+	}
+	return 0;
+
+bail_inp_reg:
+	input_unregister_device(lis->input_dev);
+bail_inp_dev:
+	input_free_device(lis->input_dev);
+bail_sysfs:
+	sysfs_remove_group(&lis->dev->kobj, &lis302dl_attr_group);
+bail_free_lis:
+	kfree(lis);
+	return rc;
+}
+
+static int __devexit lis302dl_remove(struct spi_device *spi)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(&spi->dev);
+	unsigned long flags;
+
+	/* Disable interrupts */
+	if (lis->flags & LIS302DL_F_IRQ_WAKE)
+		disable_irq_wake(lis->pdata->interrupt);
+	free_irq(lis->pdata->interrupt, lis);
+
+	/* Reset and power down the device */
+	local_irq_save(flags);
+	__reg_write(lis, LIS302DL_REG_CTRL3, 0x00);
+	__reg_write(lis, LIS302DL_REG_CTRL2, 0x00);
+	__reg_write(lis, LIS302DL_REG_CTRL1, 0x00);
+	local_irq_restore(flags);
+
+	/* Cleanup resources */
+	sysfs_remove_group(&spi->dev.kobj, &lis302dl_attr_group);
+	input_unregister_device(lis->input_dev);
+	if (lis->input_dev)
+		input_free_device(lis->input_dev);
+	dev_set_drvdata(lis->dev, NULL);
+	kfree(lis);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static u8 regs_to_save[] = {
+	LIS302DL_REG_CTRL1,
+	LIS302DL_REG_CTRL2,
+	LIS302DL_REG_CTRL3,
+	LIS302DL_REG_FF_WU_CFG_1,
+	LIS302DL_REG_FF_WU_THS_1,
+	LIS302DL_REG_FF_WU_DURATION_1,
+	LIS302DL_REG_FF_WU_CFG_2,
+	LIS302DL_REG_FF_WU_THS_2,
+	LIS302DL_REG_FF_WU_DURATION_2,
+	LIS302DL_REG_CLICK_CFG,
+	LIS302DL_REG_CLICK_THSY_X,
+	LIS302DL_REG_CLICK_THSZ,
+	LIS302DL_REG_CLICK_TIME_LIMIT,
+	LIS302DL_REG_CLICK_LATENCY,
+	LIS302DL_REG_CLICK_WINDOW,
+
+};
+
+static int lis302dl_suspend(struct spi_device *spi, pm_message_t state)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(&spi->dev);
+	unsigned long flags;
+	u_int8_t tmp;
+	int n;
+
+	/* determine if we want to wake up from the accel. */
+	if (lis->flags & LIS302DL_F_WUP_CLICK)
+		return 0;
+
+	disable_irq(lis->pdata->interrupt);
+	local_irq_save(flags);
+
+	/*
+	 * When we share SPI over multiple sensors, there is a race here
+	 * that one or more sensors will lose.  In that case, the shared
+	 * SPI bus GPIO will be in sleep mode and partially pulled down.  So
+	 * we explicitly put our IO into "wake" mode here before the final
+	 * traffic to the sensor.
+	 */
+	(lis->pdata->lis302dl_suspend_io)(lis, 1);
+
+	/* save registers */
+	for (n = 0; n < ARRAY_SIZE(regs_to_save); n++)
+		lis->regs[regs_to_save[n]] =
+			__reg_read(lis, regs_to_save[n]);
+
+	/* power down or enable wakeup */
+
+	if (lis->wakeup.threshold == 0) {
+		tmp = __reg_read(lis, LIS302DL_REG_CTRL1);
+		tmp &= ~LIS302DL_CTRL1_PD;
+		__reg_write(lis, LIS302DL_REG_CTRL1, tmp);
+	} else
+		__enable_wakeup(lis);
+
+	/* place our IO to the device in sleep-compatible states */
+	(lis->pdata->lis302dl_suspend_io)(lis, 0);
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static int lis302dl_resume(struct spi_device *spi)
+{
+	struct lis302dl_info *lis = dev_get_drvdata(&spi->dev);
+	unsigned long flags;
+	int n;
+
+	if (lis->flags & LIS302DL_F_WUP_CLICK)
+		return 0;
+
+	local_irq_save(flags);
+
+	/* get our IO to the device back in operational states */
+	(lis->pdata->lis302dl_suspend_io)(lis, 1);
+
+	/* resume from powerdown first! */
+	__reg_write(lis, LIS302DL_REG_CTRL1,
+			LIS302DL_CTRL1_PD |
+			LIS302DL_CTRL1_Xen |
+			LIS302DL_CTRL1_Yen |
+			LIS302DL_CTRL1_Zen);
+	mdelay(1);
+
+	if (__lis302dl_reset_device(lis))
+		dev_err(&spi->dev, "device BOOT reload failed\n");
+
+	lis->regs[LIS302DL_REG_CTRL1] |=	LIS302DL_CTRL1_PD |
+						LIS302DL_CTRL1_Xen |
+						LIS302DL_CTRL1_Yen |
+						LIS302DL_CTRL1_Zen;
+
+	/* restore registers after resume */
+	for (n = 0; n < ARRAY_SIZE(regs_to_save); n++)
+		__reg_write(lis, regs_to_save[n], lis->regs[regs_to_save[n]]);
+
+	/* if someone had us open, reset the non-wake threshold stuff */
+	if (lis->flags & LIS302DL_F_INPUT_OPEN)
+		__enable_data_collection(lis);
+
+	local_irq_restore(flags);
+	enable_irq(lis->pdata->interrupt);
+
+	return 0;
+}
+#else
+#define lis302dl_suspend	NULL
+#define lis302dl_resume		NULL
+#endif
+
+static struct spi_driver lis302dl_spi_driver = {
+	.driver = {
+		.name = "lis302dl",
+		.owner = THIS_MODULE,
+	},
+
+	.probe 	= lis302dl_probe,
+	.remove	= __devexit_p(lis302dl_remove),
+	.suspend = lis302dl_suspend,
+	.resume	 = lis302dl_resume,
+};
+
+static int __devinit lis302dl_init(void)
+{
+	return spi_register_driver(&lis302dl_spi_driver);
+}
+
+static void __exit lis302dl_exit(void)
+{
+	spi_unregister_driver(&lis302dl_spi_driver);
+}
+
+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
+MODULE_LICENSE("GPL");
+
+module_init(lis302dl_init);
+module_exit(lis302dl_exit);