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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
373 lines
12 KiB
Diff
373 lines
12 KiB
Diff
From 69acbd477fb7024d2cfa3702036b92ecb6c8e7b5 Mon Sep 17 00:00:00 2001
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From: Simon Kagstrom <simon.kagstrom@gmail.com>
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Date: Fri, 15 Aug 2008 11:50:56 +0100
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Subject: [PATCH] interface for configuring freefall/wakeup interrupts for the accelerometers
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Hi!
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First: Unfortunately, the freerunner currently wakes up immediately on
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suspend when the accelerometer IRQ is selected as a wakeup source. I'm
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posting this for comments and if someone else wants to have a look at
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this problem.
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The patch should be safe to apply even though the sleep portion doesn't
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work - as long as it's configured it will not disturb anything.
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// Simon
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--
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lis302dl-configure-wakeup-interrupts.patch
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From: simon.kagstrom <simon.kagstrom@gmail.com>
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First: Unfortunately, the freerunner currently wakes up immediately on
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suspend when the accelerometer IRQ is selected as a wakeup source.
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Add configuration of wakeup/freefall interrupts through a sysfs
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interface. Configuration is done through echoing a value of the
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form
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X Y Z THRESHOLD DURATION SPEC
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to freefall_wakeup_1/2. X, Y and Z are threshold values, given as a
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value > 0, < 0 or 0 to specify if an interrupt should be generated for
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high or low thresholds or neither (off). THRESHOLD specifies the
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threshold that must be exceeded. DURATION specifies the time in
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milliseconds for which the acceleration should be measured. SPEC is
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either '1' or '0' and specifies if the thresholds should be taken all
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together or one at a time ('and' or 'or' mode).
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Echoing '0' to the file turns off the interrupts.
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Example:
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echo "1 1 1 60 60 0" > freefall_wakeup_1 # Turn on x,y,z, 60ms/60 threshold, or-mode
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echo "0" > freefall_wakeup_1 # Turn off interrupt
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The hardware supports two simulataneous wakeup sources to be configured,
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but the freerunner only connects one of the interrupt outputs. The patch
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exports both. Similarly, only the "top" accelerometer can be used as a
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wake-up source, and it's not possible to generate DATA_READY interrupts
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while the wakeup interrupts are active.
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Signed-off-by: Simon Kagstrom <simon.kagstrom@gmail.com>
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---
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drivers/input/misc/lis302dl.c | 232 +++++++++++++++++++++++++++++++++++++++--
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include/linux/lis302dl.h | 8 +-
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2 files changed, 227 insertions(+), 13 deletions(-)
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diff --git a/drivers/input/misc/lis302dl.c b/drivers/input/misc/lis302dl.c
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index b97cae7..3f6d0eb 100644
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--- a/drivers/input/misc/lis302dl.c
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+++ b/drivers/input/misc/lis302dl.c
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@@ -248,10 +248,212 @@ static ssize_t lis302dl_dump(struct device *dev, struct device_attribute *attr,
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}
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static DEVICE_ATTR(dump, S_IRUGO, lis302dl_dump, NULL);
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+static int freefall_ms_to_duration(struct lis302dl_info *lis, int ms)
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+{
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+ u_int8_t r = reg_read(lis, LIS302DL_REG_CTRL1);
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+
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+ /* If we have 400 ms sampling rate, the stepping is 2.5 ms,
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+ * on 100 ms the stepping is 10ms */
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+ if ( r & LIS302DL_CTRL1_DR ) {
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+ /* Too large */
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+ if (ms > 637)
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+ return -1;
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+
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+ return (ms * 10) / 25;
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+ }
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+
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+ /* Too large value */
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+ if (ms > 2550)
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+ return -1;
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+ return ms / 10;
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+}
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+
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+static int freefall_duration_to_ms(struct lis302dl_info *lis, int duration)
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+{
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+ u_int8_t r = reg_read(lis, LIS302DL_REG_CTRL1);
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+
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+ if ( r & LIS302DL_CTRL1_DR )
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+ return (duration * 25) / 10;
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+
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+ return duration * 10;
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+}
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+
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+/* Configure freefall/wakeup interrupts */
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+static ssize_t set_freefall_common(int which, struct device *dev, struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ struct lis302dl_info *lis = dev_get_drvdata(dev);
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+ u_int8_t x_lo, y_lo, z_lo;
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+ u_int8_t x_hi, y_hi, z_hi;
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+ int duration;
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+ int threshold;
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+ int and_events;
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+ int r_ths = LIS302DL_REG_FF_WU_THS_1; /* registers, assume first pin */
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+ int r_duration = LIS302DL_REG_FF_WU_DURATION_1;
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+ int r_cfg = LIS302DL_REG_FF_WU_CFG_1;
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+ int flag_mask = LIS302DL_F_WUP_FF_1;
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+ int intmode = LIS302DL_INTMODE_FF_WU_1;
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+ int x, y, z;
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+ int ms;
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+ unsigned long flags;
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+
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+ /* Configure for second freefall/wakeup pin */
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+ if (which == 2) {
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+ r_ths = LIS302DL_REG_FF_WU_THS_2;
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+ r_duration = LIS302DL_REG_FF_WU_DURATION_2;
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+ r_cfg = LIS302DL_REG_FF_WU_CFG_2;
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+ flag_mask = LIS302DL_F_WUP_FF_2;
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+ intmode = LIS302DL_INTMODE_FF_WU_2;
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+
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+ printk(KERN_WARNING "Configuring second freefall / wakeup interrupt\n");
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+ }
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+
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+ /* Parse the input */
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+ if (strcmp(buf, "0\n") == 0)
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+ {
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+ /* Turn off the interrupt */
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+ local_save_flags(flags);
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+ if ( (lis->flags & LIS302DL_F_IRQ_WAKE) != 0 )
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+ disable_irq_wake(lis->spi_dev->irq);
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+ lis302dl_int_mode(lis->spi_dev, which, LIS302DL_INTMODE_DATA_READY);
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+ lis->flags &= ~(flag_mask | LIS302DL_F_IRQ_WAKE);
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+
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+ reg_write(lis, r_cfg, 0);
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+ reg_write(lis, r_ths, 0);
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+ reg_write(lis, r_duration, 0);
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+
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+ /* Power off unless the input subsystem is using the device */
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+ if ( (lis->flags & LIS302DL_F_INPUT_OPEN) == 0 )
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+ reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_PD, 0);
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+
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+ local_irq_restore(flags);
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+
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+ return count;
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+ }
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+
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+ if (sscanf(buf, "%d %d %d %d %d %d", &x, &y, &z, &threshold, &ms, &and_events) != 6)
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+ return -EINVAL;
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+
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+ duration = freefall_ms_to_duration(lis, ms);
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+ if (duration < 0)
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+ return -ERANGE;
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+
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+ /* 7 bits */
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+ if (threshold < 0 || threshold > 127)
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+ return -ERANGE;
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+
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+ /* Interrupt flags */
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+ x_lo = x < 0 ? LIS302DL_FFWUCFG_XLIE : 0;
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+ y_lo = y < 0 ? LIS302DL_FFWUCFG_YLIE : 0;
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+ z_lo = z < 0 ? LIS302DL_FFWUCFG_ZLIE : 0;
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+ x_hi = x > 0 ? LIS302DL_FFWUCFG_XHIE : 0;
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+ y_hi = y > 0 ? LIS302DL_FFWUCFG_YHIE : 0;
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+ z_hi = z > 0 ? LIS302DL_FFWUCFG_ZHIE : 0;
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+
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+ /* Setup the configuration registers */
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+ local_save_flags(flags);
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+ reg_write(lis, r_cfg, 0); /* First zero to get to a known state */
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+ reg_write(lis, r_cfg,
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+ (and_events ? LIS302DL_FFWUCFG_AOI : 0) |
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+ x_lo | x_hi | y_lo | y_hi | z_lo | z_hi);
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+ reg_write(lis, r_ths, threshold & ~LIS302DL_FFWUTHS_DCRM);
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+ reg_write(lis, r_duration, duration);
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+
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+ /* Route the interrupt for wakeup */
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+ lis302dl_int_mode(lis->spi_dev, which, intmode);
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+
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+ /* Power up the device and note that we want to wake up from
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+ * this interrupt */
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+ if ( (lis->flags & LIS302DL_F_IRQ_WAKE) == 0 )
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+ enable_irq_wake(lis->spi_dev->irq);
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+
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+ lis->flags |= flag_mask | LIS302DL_F_IRQ_WAKE;
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+ reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_PD,
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+ LIS302DL_CTRL1_PD);
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+ local_irq_restore(flags);
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+
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+ return count;
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+}
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+
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+static ssize_t set_freefall_1(struct device *dev, struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ return set_freefall_common(1, dev, attr, buf, count);
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+}
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+static ssize_t set_freefall_2(struct device *dev, struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ return set_freefall_common(2, dev, attr, buf, count);
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+}
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+
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+
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+static ssize_t show_freefall_common(int which, struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct lis302dl_info *lis = dev_get_drvdata(dev);
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+ u_int8_t duration;
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+ u_int8_t threshold;
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+ u_int8_t config;
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+ u_int8_t r4;
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+ u_int8_t r5;
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+ int r_ths = LIS302DL_REG_FF_WU_THS_1; /* registers, assume first pin */
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+ int r_duration = LIS302DL_REG_FF_WU_DURATION_1;
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+ int r_cfg = LIS302DL_REG_FF_WU_CFG_1;
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+ int r_src = LIS302DL_REG_FF_WU_SRC_1;
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+
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+ /* Configure second freefall/wakeup pin */
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+ if (which == 2) {
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+ r_ths = LIS302DL_REG_FF_WU_THS_2;
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+ r_duration = LIS302DL_REG_FF_WU_DURATION_2;
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+ r_cfg = LIS302DL_REG_FF_WU_CFG_2;
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+ r_src = LIS302DL_REG_FF_WU_SRC_2;
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+ }
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+ config = reg_read(lis, r_cfg);
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+ threshold = reg_read(lis, r_ths);
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+ duration = reg_read(lis, r_duration);
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+ r4 = reg_read(lis, r_src);
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+ r5 = reg_read(lis, LIS302DL_REG_CTRL3);
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+
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+ /* All events off? */
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+ if ((config & (LIS302DL_FFWUCFG_XLIE | LIS302DL_FFWUCFG_XHIE |
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+ LIS302DL_FFWUCFG_YLIE | LIS302DL_FFWUCFG_YHIE |
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+ LIS302DL_FFWUCFG_ZLIE | LIS302DL_FFWUCFG_ZHIE)) == 0)
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+ return sprintf(buf, "off\n");
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+
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+ return sprintf(buf,"%s events, %s interrupt, duration %d, threshold %d, "
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+ "enabled: %s %s %s %s %s %s\n",
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+ (config & LIS302DL_FFWUCFG_AOI) == 0 ? "or" : "and",
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+ (config & LIS302DL_FFWUCFG_LIR) == 0 ? "don't latch" : "latch",
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+ freefall_duration_to_ms(lis, duration), threshold,
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+ (config & LIS302DL_FFWUCFG_XLIE) == 0 ? "---" : "xlo",
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+ (config & LIS302DL_FFWUCFG_XHIE) == 0 ? "---" : "xhi",
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+ (config & LIS302DL_FFWUCFG_YLIE) == 0 ? "---" : "ylo",
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+ (config & LIS302DL_FFWUCFG_YHIE) == 0 ? "---" : "yhi",
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+ (config & LIS302DL_FFWUCFG_ZLIE) == 0 ? "---" : "zlo",
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+ (config & LIS302DL_FFWUCFG_ZHIE) == 0 ? "---" : "zhi");
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+}
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+
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+static ssize_t show_freefall_1(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ return show_freefall_common(1, dev, attr, buf);
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+}
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+
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+static ssize_t show_freefall_2(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ return show_freefall_common(2, dev, attr, buf);
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+}
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+
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+static DEVICE_ATTR(freefall_wakeup_1, S_IRUGO | S_IWUSR, show_freefall_1, set_freefall_1);
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+static DEVICE_ATTR(freefall_wakeup_2, S_IRUGO | S_IWUSR, show_freefall_2, set_freefall_2);
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+
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static struct attribute *lis302dl_sysfs_entries[] = {
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&dev_attr_sample_rate.attr,
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&dev_attr_full_scale.attr,
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&dev_attr_dump.attr,
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+ &dev_attr_freefall_wakeup_1.attr,
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+ &dev_attr_freefall_wakeup_2.attr,
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NULL
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};
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@@ -274,6 +476,8 @@ static int lis302dl_input_open(struct input_dev *inp)
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reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, ctrl1, ctrl1);
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local_irq_restore(flags);
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+ lis->flags |= LIS302DL_F_INPUT_OPEN;
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+
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/* kick it off -- since we are edge triggered, if we missed the edge
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* permanent low interrupt is death for us */
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(lis->pdata->lis302dl_bitbang_read)(lis);
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@@ -294,6 +498,7 @@ static void lis302dl_input_close(struct input_dev *inp)
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* only see close() for the close of the last user, we can safely
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* disable the data ready events */
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reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, ctrl1, 0x00);
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+ lis->flags &= ~LIS302DL_F_INPUT_OPEN;
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/* however, don't power down the whole device if still needed */
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if (!(lis->flags & LIS302DL_F_WUP_FF ||
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@@ -406,9 +611,9 @@ static int __devinit lis302dl_probe(struct spi_device *spi)
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reg_write(lis, LIS302DL_REG_CTRL2, 0);
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reg_write(lis, LIS302DL_REG_CTRL3, LIS302DL_CTRL3_PP_OD |
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LIS302DL_CTRL3_IHL);
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- reg_write(lis, LIS302DL_REG_FF_WU_THS_1, 0x14);
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+ reg_write(lis, LIS302DL_REG_FF_WU_THS_1, 0x0);
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reg_write(lis, LIS302DL_REG_FF_WU_DURATION_1, 0x00);
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- reg_write(lis, LIS302DL_REG_FF_WU_CFG_1, 0x95);
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+ reg_write(lis, LIS302DL_REG_FF_WU_CFG_1, 0x0);
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/* start off in powered down mode; we power up when someone opens us */
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reg_write(lis, LIS302DL_REG_CTRL1, LIS302DL_CTRL1_Xen |
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@@ -486,6 +691,12 @@ static int lis302dl_suspend(struct spi_device *spi, pm_message_t state)
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{
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struct lis302dl_info *lis = dev_get_drvdata(&spi->dev);
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unsigned long flags;
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+ u_int8_t tmp;
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+
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+ /* determine if we want to wake up from the accel. */
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+ if (lis->flags & LIS302DL_F_WUP_FF ||
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+ lis->flags & LIS302DL_F_WUP_CLICK)
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+ return 0;
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disable_irq(lis->spi_dev->irq);
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local_save_flags(flags);
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@@ -528,15 +739,10 @@ static int lis302dl_suspend(struct spi_device *spi, pm_message_t state)
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lis->regs[LIS302DL_REG_CLICK_WINDOW] =
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reg_read(lis, LIS302DL_REG_CLICK_WINDOW);
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- /* determine if we want to wake up from the accel. */
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- if (!(lis->flags & LIS302DL_F_WUP_FF ||
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- lis->flags & LIS302DL_F_WUP_CLICK)) {
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- /* power down */
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- u_int8_t tmp;
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- tmp = reg_read(lis, LIS302DL_REG_CTRL1);
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- tmp &= ~LIS302DL_CTRL1_PD;
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- reg_write(lis, LIS302DL_REG_CTRL1, tmp);
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- }
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+ /* power down */
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+ tmp = reg_read(lis, LIS302DL_REG_CTRL1);
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+ tmp &= ~LIS302DL_CTRL1_PD;
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+ reg_write(lis, LIS302DL_REG_CTRL1, tmp);
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/* place our IO to the device in sleep-compatible states */
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(lis->pdata->lis302dl_suspend_io)(lis, 0);
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@@ -551,6 +757,10 @@ static int lis302dl_resume(struct spi_device *spi)
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struct lis302dl_info *lis = dev_get_drvdata(&spi->dev);
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unsigned long flags;
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+ if (lis->flags & LIS302DL_F_WUP_FF ||
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+ lis->flags & LIS302DL_F_WUP_CLICK)
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+ return 0;
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+
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local_save_flags(flags);
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/* get our IO to the device back in operational states */
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diff --git a/include/linux/lis302dl.h b/include/linux/lis302dl.h
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index e4a44f5..7daa8b3 100644
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--- a/include/linux/lis302dl.h
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+++ b/include/linux/lis302dl.h
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@@ -129,10 +129,14 @@ enum lis302dl_reg_cloik_src {
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#define LIS302DL_WHO_AM_I_MAGIC 0x3b
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-#define LIS302DL_F_WUP_FF 0x0001 /* wake up from free fall */
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-#define LIS302DL_F_WUP_CLICK 0x0002
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+#define LIS302DL_F_WUP_FF_1 0x0001 /* wake up from free fall */
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+#define LIS302DL_F_WUP_FF_2 0x0002
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+#define LIS302DL_F_WUP_FF 0x0003
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+#define LIS302DL_F_WUP_CLICK 0x0004
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#define LIS302DL_F_POWER 0x0010
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#define LIS302DL_F_FS 0x0020 /* ADC full scale */
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+#define LIS302DL_F_INPUT_OPEN 0x0040 /* Set if input device is opened */
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+#define LIS302DL_F_IRQ_WAKE 0x0080 /* IRQ is setup in wake mode */
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#endif /* _LINUX_LIS302DL_H */
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--
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1.5.6.5
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