openwrt/target/linux/s3c24xx/patches-2.6.24/1310--lis302dl-wakeup-configuration.patch.patch

From 933f18caaf8f96d1094f064312d416a2fe0b4337 Mon Sep 17 00:00:00 2001
From: Simon Kagstrom <simon.kagstrom@gmail.com>
Date: Thu, 16 Oct 2008 01:19:56 +0100
Subject: [PATCH] : lis302dl-wakeup-configuration.patch

Setup accelerometer interrupt to wake the device up

From: Simon Kagstrom <simon.kagstrom@gmail.com>

The threshold implementation recently broke this functionality. This
patch reinstates it again and simplifies the code a bit. It only
supports one of the two lis302dl interrupt sources now (which is the
only connected one on the openmoko). If you need to configure both, buy
an Iphone!

(Or flame this patch)


Note that, as before, the device immediately wakes up when put to sleep
with the wakeup configured. The interface is therefore not currently
very useful, but to use it do e.g.,

   echo 1 1 1 180 0 1 > wakeup

The value is of the form

   X Y Z THRESHOLD DURATION SPEC

X, Y and Z are threshold values, given as a value > 0, < 0 or 0 to
specify if an interrupt should be generated for high or low thresholds
or neither (off). THRESHOLD specifies the threshold that must be
exceeded, in mg. DURATION specifies the time in milliseconds for which
the acceleration should be measured. SPEC is either '1' or '0' and
specifies if the thresholds should be taken all together or one at a
time ('and' or 'or' mode).

Echoing '0' to the file turns off the interrupts.

Signed-off-by: Simon Kagstrom <simon.kagstrom@gmail.com>
---
 drivers/input/misc/lis302dl.c |  204 ++++++++++++-----------------------------
 include/linux/lis302dl.h      |    6 +
 2 files changed, 63 insertions(+), 147 deletions(-)

diff --git a/drivers/input/misc/lis302dl.c b/drivers/input/misc/lis302dl.c
index e404a45..f743a24 100644
--- a/drivers/input/misc/lis302dl.c
+++ b/drivers/input/misc/lis302dl.c
@@ -133,6 +133,23 @@ static void __lis302dl_int_mode(struct device *dev, int int_pin,
 	}
 }
 
+static void __enable_wakeup(struct lis302dl_info *lis)
+{
+	/* First zero to get to a known state */
+	__reg_write(lis, LIS302DL_REG_FF_WU_CFG_1,
+			lis->wakeup.cfg);
+	__reg_write(lis, LIS302DL_REG_FF_WU_THS_1,
+			lis->wakeup.threshold);
+	__reg_write(lis, LIS302DL_REG_FF_WU_DURATION_1,
+			lis->wakeup.duration);
+
+	/* Route the interrupt for wakeup */
+	__lis302dl_int_mode(lis->dev, 1,
+			LIS302DL_INTMODE_FF_WU_1);
+
+	__reg_write(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_PD);
+}
+
 static void __enable_data_collection(struct lis302dl_info *lis)
 {
 	u_int8_t ctrl1 = LIS302DL_CTRL1_PD | LIS302DL_CTRL1_Xen |
@@ -395,73 +412,33 @@ static ssize_t lis302dl_dump(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR(dump, S_IRUGO, lis302dl_dump, NULL);
 
 /* Configure freefall/wakeup interrupts */
-static ssize_t set_freefall_common(int which, struct device *dev,
-		   struct device_attribute *attr, const char *buf, size_t count)
+static ssize_t set_wakeup(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
 {
 	struct lis302dl_info *lis = dev_get_drvdata(dev);
 	u_int8_t x_lo, y_lo, z_lo;
 	u_int8_t x_hi, y_hi, z_hi;
-	int duration;
-	int threshold;
-	int and_events;
-	int r_ths = LIS302DL_REG_FF_WU_THS_1; /* registers, assume first pin */
-	int r_duration = LIS302DL_REG_FF_WU_DURATION_1;
-	int r_cfg = LIS302DL_REG_FF_WU_CFG_1;
-	int flag_mask = LIS302DL_F_WUP_FF_1;
-	int intmode = LIS302DL_INTMODE_FF_WU_1;
+	int duration, threshold, and_events;
 	int x, y, z;
-	int ms;
-	unsigned long flags;
-
-	/* Configure for second freefall/wakeup pin */
-	if (which == 2) {
-		r_ths = LIS302DL_REG_FF_WU_THS_2;
-		r_duration = LIS302DL_REG_FF_WU_DURATION_2;
-		r_cfg = LIS302DL_REG_FF_WU_CFG_2;
-		flag_mask = LIS302DL_F_WUP_FF_2;
-		intmode = LIS302DL_INTMODE_FF_WU_2;
 
-		printk(KERN_WARNING
-			    "Configuring second freefall / wakeup interrupt\n");
-	}
-
-	/* Parse the input */
+	/* Zero turns the feature off */
 	if (strcmp(buf, "0\n") == 0) {
-		/* Turn off the interrupt */
-		local_irq_save(flags);
-		if (lis->flags & LIS302DL_F_IRQ_WAKE)
-			disable_irq_wake(lis->pdata->interrupt);
-		__lis302dl_int_mode(lis->dev, which,
-						   LIS302DL_INTMODE_DATA_READY);
-		lis->flags &= ~(flag_mask | LIS302DL_F_IRQ_WAKE);
-
-		__reg_write(lis, r_cfg, 0);
-		__reg_write(lis, r_ths, 0);
-		__reg_write(lis, r_duration, 0);
+		lis->wakeup.active = 0;
 
-		/* Power off unless the input subsystem is using the device */
-		if (!(lis->flags & LIS302DL_F_INPUT_OPEN))
-			__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1,
-							  LIS302DL_CTRL1_PD, 0);
-
-		local_irq_restore(flags);
+		if (lis->flags & LIS302DL_F_IRQ_WAKE) {
+			disable_irq_wake(lis->pdata->interrupt);
+			lis->flags &= ~LIS302DL_F_IRQ_WAKE;
+		}
 
 		return count;
 	}
 
-	if (sscanf(buf, "%d %d %d %d %d %d", &x, &y, &z, &threshold, &ms,
-							      &and_events) != 6)
+	if (sscanf(buf, "%d %d %d %d %d %d", &x, &y, &z, &threshold, &duration,
+			&and_events) != 6)
 		return -EINVAL;
 
-	local_irq_save(flags);
-	duration = __ms_to_duration(lis, ms);
-	local_irq_save(flags);
-
-	if (duration < 0)
-		return -ERANGE;
-
-	/* 7 bits */
-	if (threshold < 0 || threshold > 127)
+	if (duration < 0 || duration > 2550 ||
+			threshold < 0 || threshold > 8000)
 		return -ERANGE;
 
 	/* Interrupt flags */
@@ -472,91 +449,38 @@ static ssize_t set_freefall_common(int which, struct device *dev,
 	y_hi = y > 0 ? LIS302DL_FFWUCFG_YHIE : 0;
 	z_hi = z > 0 ? LIS302DL_FFWUCFG_ZHIE : 0;
 
-	/* Setup the configuration registers */
-	local_irq_save(flags);
-	/* First zero to get to a known state */
-	__reg_write(lis, r_cfg, 0);
-	__reg_write(lis, r_cfg,
-		(and_events ? LIS302DL_FFWUCFG_AOI : 0) |
-		x_lo | x_hi | y_lo | y_hi | z_lo | z_hi);
-	__reg_write(lis, r_ths, threshold & ~LIS302DL_FFWUTHS_DCRM);
-	__reg_write(lis, r_duration, duration);
+	lis->wakeup.duration = __ms_to_duration(lis, duration);
+	lis->wakeup.threshold = __mg_to_threshold(lis, threshold);
+	lis->wakeup.cfg = (and_events ? LIS302DL_FFWUCFG_AOI : 0) |
+		x_lo | x_hi | y_lo | y_hi | z_lo | z_hi;
 
-	/* Route the interrupt for wakeup */
-	__lis302dl_int_mode(lis->dev, which, intmode);
-
-	/* Power up the device and note that we want to wake up from
-	 * this interrupt */
-	if (!(lis->flags & LIS302DL_F_IRQ_WAKE))
+	if (!(lis->flags & LIS302DL_F_IRQ_WAKE)) {
 		enable_irq_wake(lis->pdata->interrupt);
-
-	lis->flags |= flag_mask | LIS302DL_F_IRQ_WAKE;
-	__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_PD,
-			LIS302DL_CTRL1_PD);
-	local_irq_restore(flags);
+		lis->flags |= LIS302DL_F_IRQ_WAKE;
+	}
+	lis->wakeup.active = 1;
 
 	return count;
 }
 
-static ssize_t set_freefall_1(struct device *dev, struct device_attribute *attr,
-			 const char *buf, size_t count)
-{
-	return set_freefall_common(1, dev, attr, buf, count);
-}
-static ssize_t set_freefall_2(struct device *dev, struct device_attribute *attr,
-			 const char *buf, size_t count)
-{
-	return set_freefall_common(2, dev, attr, buf, count);
-}
-
-
-static ssize_t show_freefall_common(int which, struct device *dev,
+static ssize_t show_wakeup(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct lis302dl_info *lis = dev_get_drvdata(dev);
-	u_int8_t duration;
-	u_int8_t threshold;
-	u_int8_t config;
-	u_int8_t r4;
-	u_int8_t r5;
-	int r_ths = LIS302DL_REG_FF_WU_THS_1; /* registers, assume first pin */
-	int r_duration = LIS302DL_REG_FF_WU_DURATION_1;
-	int r_cfg = LIS302DL_REG_FF_WU_CFG_1;
-	int r_src = LIS302DL_REG_FF_WU_SRC_1;
-	unsigned long flags;
-	int ms;
-
-	/* Configure second freefall/wakeup pin */
-	if (which == 2) {
-		r_ths = LIS302DL_REG_FF_WU_THS_2;
-		r_duration = LIS302DL_REG_FF_WU_DURATION_2;
-		r_cfg = LIS302DL_REG_FF_WU_CFG_2;
-		r_src = LIS302DL_REG_FF_WU_SRC_2;
-	}
-
-	local_irq_save(flags);
-	config = __reg_read(lis, r_cfg);
-	threshold = __reg_read(lis, r_ths);
-	duration = __reg_read(lis, r_duration);
-	r4 = __reg_read(lis, r_src);
-	r5 = __reg_read(lis, LIS302DL_REG_CTRL3);
-	ms = __duration_to_ms(lis, duration);
-	local_irq_restore(flags);
+	u8 config;
 
 	/* All events off? */
-	if ((config & (LIS302DL_FFWUCFG_XLIE | LIS302DL_FFWUCFG_XHIE |
-			LIS302DL_FFWUCFG_YLIE | LIS302DL_FFWUCFG_YHIE |
-			LIS302DL_FFWUCFG_ZLIE | LIS302DL_FFWUCFG_ZHIE)) == 0)
+	if (!lis->wakeup.active)
 		return sprintf(buf, "off\n");
 
+	config = lis->wakeup.cfg;
 
 	return sprintf(buf,
-			"%s events, %s interrupt, duration %d, threshold %d, "
+			"%s events, duration %d, threshold %d, "
 			"enabled: %s %s %s %s %s %s\n",
 			(config & LIS302DL_FFWUCFG_AOI) == 0 ? "or" : "and",
-			(config & LIS302DL_FFWUCFG_LIR) == 0 ?
-							"don't latch" : "latch",
-			ms, threshold,
+			__duration_to_ms(lis, lis->wakeup.duration),
+			__threshold_to_mg(lis, lis->wakeup.threshold),
 			(config & LIS302DL_FFWUCFG_XLIE) == 0 ? "---" : "xlo",
 			(config & LIS302DL_FFWUCFG_XHIE) == 0 ? "---" : "xhi",
 			(config & LIS302DL_FFWUCFG_YLIE) == 0 ? "---" : "ylo",
@@ -565,22 +489,7 @@ static ssize_t show_freefall_common(int which, struct device *dev,
 			(config & LIS302DL_FFWUCFG_ZHIE) == 0 ? "---" : "zhi");
 }
 
-static ssize_t show_freefall_1(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	return show_freefall_common(1, dev, attr, buf);
-}
-
-static ssize_t show_freefall_2(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	return show_freefall_common(2, dev, attr, buf);
-}
-
-static DEVICE_ATTR(freefall_wakeup_1, S_IRUGO | S_IWUSR, show_freefall_1,
-								set_freefall_1);
-static DEVICE_ATTR(freefall_wakeup_2, S_IRUGO | S_IWUSR, show_freefall_2,
-								set_freefall_2);
+static DEVICE_ATTR(wakeup, S_IRUGO | S_IWUSR, show_wakeup, set_wakeup);
 
 static struct attribute *lis302dl_sysfs_entries[] = {
 	&dev_attr_sample_rate.attr,
@@ -588,8 +497,7 @@ static struct attribute *lis302dl_sysfs_entries[] = {
 	&dev_attr_threshold.attr,
 	&dev_attr_duration.attr,
 	&dev_attr_dump.attr,
-	&dev_attr_freefall_wakeup_1.attr,
-	&dev_attr_freefall_wakeup_2.attr,
+	&dev_attr_wakeup.attr,
 	NULL
 };
 
@@ -715,6 +623,7 @@ static int __devinit lis302dl_probe(struct platform_device *pdev)
 */
 	lis->threshold = 1;
 	lis->duration = 0;
+	memset(&lis->wakeup, 0, sizeof(lis->wakeup));
 
 	lis->input_dev->private = lis;
 	lis->input_dev->name = pdata->name;
@@ -845,8 +754,7 @@ static int lis302dl_suspend(struct platform_device *pdev, pm_message_t state)
 	int n;
 
 	/* determine if we want to wake up from the accel. */
-	if (lis->flags & LIS302DL_F_WUP_FF ||
-		lis->flags & LIS302DL_F_WUP_CLICK)
+	if (lis->flags & LIS302DL_F_WUP_CLICK)
 		return 0;
 
 	disable_irq(lis->pdata->interrupt);
@@ -866,10 +774,13 @@ static int lis302dl_suspend(struct platform_device *pdev, pm_message_t state)
 		lis->regs[regs_to_save[n]] =
 			__reg_read(lis, regs_to_save[n]);
 
-	/* power down */
-	tmp = __reg_read(lis, LIS302DL_REG_CTRL1);
-	tmp &= ~LIS302DL_CTRL1_PD;
-	__reg_write(lis, LIS302DL_REG_CTRL1, tmp);
+	/* power down or enable wakeup */
+	if (!lis->wakeup.active) {
+		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);
@@ -885,8 +796,7 @@ static int lis302dl_resume(struct platform_device *pdev)
 	unsigned long flags;
 	int n;
 
-	if (lis->flags & LIS302DL_F_WUP_FF ||
-		lis->flags & LIS302DL_F_WUP_CLICK)
+	if (lis->flags & LIS302DL_F_WUP_CLICK)
 		return 0;
 
 	local_irq_save(flags);
diff --git a/include/linux/lis302dl.h b/include/linux/lis302dl.h
index f7aa956..f4121d9 100644
--- a/include/linux/lis302dl.h
+++ b/include/linux/lis302dl.h
@@ -31,6 +31,12 @@ struct lis302dl_info {
 	unsigned int flags;
 	unsigned int threshold;
 	unsigned int duration;
+	struct {
+		u8 cfg;
+		u8 threshold;
+		u8 duration;
+		int active;
+	} wakeup;
 	u_int8_t regs[0x40];
 };
 
-- 
1.5.6.5