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(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
299 lines
10 KiB
Diff
299 lines
10 KiB
Diff
From 35d910f40ce2c7c959edfbaa671f88e8da5fa6b1 Mon Sep 17 00:00:00 2001
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From: Simon Kagstrom <simon.kagstrom@gmail.com>
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Date: Mon, 13 Oct 2008 12:47:12 +0100
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Subject: [PATCH] : Acceleration threshold configuration: lis302dl-configure-threshold-on-bitbang.patch
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Configure threshold for accelerometer input
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From: Simon Kagstrom <simon.kagstrom@gmail.com>
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This patch, based on bitbang-all-the-way from the andy branch,
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implements a configurable acceleration threshold that need to be
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exceeded for the accelerometer to generate input data. The threshold can
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be set in sysfs:
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cd /sys/devices/.../lis302dl.1/
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echo 10 > threshold
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A value of 10 (180 mg, from the lis302dl application note) seems
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empirically good to keep the accelerometers quiet while riding a (calm)
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train.
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The patch moves the sample reading for the accelerometers from
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mach-gta02.c to lis302dl.c and instead exports the generic
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lis302dl_bitbang function. This is to easier support both "raw" data
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reading and reading with a threshold in the future (not yet implemented).
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Signed-off-by: Simon Kagstrom <simon.kagstrom@gmail.com>
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---
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arch/arm/mach-s3c2440/mach-gta02.c | 35 ++-------------
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drivers/input/misc/lis302dl.c | 83 ++++++++++++++++++++++++++++++++++--
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include/linux/lis302dl.h | 3 +
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3 files changed, 87 insertions(+), 34 deletions(-)
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diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
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index b19632c..1a9d823 100644
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--- a/arch/arm/mach-s3c2440/mach-gta02.c
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+++ b/arch/arm/mach-s3c2440/mach-gta02.c
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@@ -1050,7 +1050,6 @@ static struct platform_device gta02_vibrator_dev = {
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*/
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/* #define DEBUG_SPEW_MS */
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-#define MG_PER_SAMPLE 18
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struct lis302dl_platform_data lis302_pdata_top;
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struct lis302dl_platform_data lis302_pdata_bottom;
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@@ -1060,7 +1059,7 @@ struct lis302dl_platform_data lis302_pdata_bottom;
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* only call with interrupts off!
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*/
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-static void __gta02_lis302dl_bitbang(struct lis302dl_info *lis, u8 *tx,
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+static void gta02_lis302dl_bitbang(struct lis302dl_info *lis, u8 *tx,
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int tx_bytes, u8 *rx, int rx_bytes)
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{
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struct lis302dl_platform_data *pdata = lis->pdata;
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@@ -1124,7 +1123,7 @@ static int gta02_lis302dl_bitbang_read_reg(struct lis302dl_info *lis, u8 reg)
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local_irq_save(flags);
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- __gta02_lis302dl_bitbang(lis, &data, 1, &data, 1);
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+ gta02_lis302dl_bitbang(lis, &data, 1, &data, 1);
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local_irq_restore(flags);
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@@ -1139,37 +1138,13 @@ static void gta02_lis302dl_bitbang_write_reg(struct lis302dl_info *lis, u8 reg,
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local_irq_save(flags);
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- __gta02_lis302dl_bitbang(lis, &data[0], 2, NULL, 0);
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+ gta02_lis302dl_bitbang(lis, &data[0], 2, NULL, 0);
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local_irq_restore(flags);
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}
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-static void gta02_lis302dl_bitbang_sample(struct lis302dl_info *lis)
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-{
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- u8 data = 0xc0 | LIS302DL_REG_OUT_X; /* read, autoincrement */
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- u8 read[5];
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- unsigned long flags;
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-
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- local_irq_save(flags);
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-
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- __gta02_lis302dl_bitbang(lis, &data, 1, &read[0], 5);
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-
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- local_irq_restore(flags);
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-
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- input_report_rel(lis->input_dev, REL_X, MG_PER_SAMPLE * (s8)read[0]);
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- input_report_rel(lis->input_dev, REL_Y, MG_PER_SAMPLE * (s8)read[2]);
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- input_report_rel(lis->input_dev, REL_Z, MG_PER_SAMPLE * (s8)read[4]);
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-
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- input_sync(lis->input_dev);
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-#ifdef DEBUG_SPEW_MS
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- printk(KERN_INFO "%s: %d %d %d\n", pdata->name, read[0], read[2],
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- read[4]);
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-#endif
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-}
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-
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-
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void gta02_lis302dl_suspend_io(struct lis302dl_info *lis, int resume)
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{
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struct lis302dl_platform_data *pdata = lis->pdata;
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@@ -1210,7 +1185,7 @@ struct lis302dl_platform_data lis302_pdata_top = {
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.pin_miso = S3C2410_GPG5,
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.interrupt = GTA02_IRQ_GSENSOR_1,
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.open_drain = 1, /* altered at runtime by PCB rev */
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- .lis302dl_bitbang_read_sample = gta02_lis302dl_bitbang_sample,
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+ .lis302dl_bitbang = gta02_lis302dl_bitbang,
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.lis302dl_bitbang_reg_read = gta02_lis302dl_bitbang_read_reg,
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.lis302dl_bitbang_reg_write = gta02_lis302dl_bitbang_write_reg,
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.lis302dl_suspend_io = gta02_lis302dl_suspend_io,
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@@ -1224,7 +1199,7 @@ struct lis302dl_platform_data lis302_pdata_bottom = {
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.pin_miso = S3C2410_GPG5,
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.interrupt = GTA02_IRQ_GSENSOR_2,
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.open_drain = 1, /* altered at runtime by PCB rev */
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- .lis302dl_bitbang_read_sample = gta02_lis302dl_bitbang_sample,
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+ .lis302dl_bitbang = gta02_lis302dl_bitbang,
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.lis302dl_bitbang_reg_read = gta02_lis302dl_bitbang_read_reg,
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.lis302dl_bitbang_reg_write = gta02_lis302dl_bitbang_write_reg,
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.lis302dl_suspend_io = gta02_lis302dl_suspend_io,
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diff --git a/drivers/input/misc/lis302dl.c b/drivers/input/misc/lis302dl.c
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index 1d5781d..1013f4a 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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@@ -4,6 +4,8 @@
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* Author: Harald Welte <laforge@openmoko.org>
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* converted to private bitbang by:
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* Andy Green <andy@openmoko.com>
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+ * ability to set acceleration threshold added by:
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+ * Simon Kagstrom <simon.kagstrom@gmail.com>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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@@ -67,6 +69,31 @@ enum lis302dl_intmode {
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LIS302DL_INTMODE_CLICK = 0x07,
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};
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+#define MG_PER_SAMPLE 18
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+
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+static void lis302dl_bitbang_read_sample(struct lis302dl_info *lis)
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+{
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+ u8 data = 0xc0 | LIS302DL_REG_OUT_X; /* read, autoincrement */
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+ u8 read[5];
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+ unsigned long flags;
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+
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+ local_irq_save(flags);
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+
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+ (lis->pdata->lis302dl_bitbang)(lis, &data, 1, &read[0], 5);
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+
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+ local_irq_restore(flags);
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+
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+ input_report_rel(lis->input_dev, REL_X, MG_PER_SAMPLE * (s8)read[0]);
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+ input_report_rel(lis->input_dev, REL_Y, MG_PER_SAMPLE * (s8)read[2]);
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+ input_report_rel(lis->input_dev, REL_Z, MG_PER_SAMPLE * (s8)read[4]);
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+
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+ input_sync(lis->input_dev);
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+
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+ /* Reset the HP filter */
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+ (lis->pdata->lis302dl_bitbang_reg_read)(lis,
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+ LIS302DL_REG_HP_FILTER_RESET);
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+}
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+
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static void __lis302dl_int_mode(struct device *dev, int int_pin,
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enum lis302dl_intmode mode)
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{
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@@ -108,7 +135,7 @@ static irqreturn_t lis302dl_interrupt(int irq, void *_lis)
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{
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struct lis302dl_info *lis = _lis;
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- (lis->pdata->lis302dl_bitbang_read_sample)(lis);
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+ lis302dl_bitbang_read_sample(lis);
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return IRQ_HANDLED;
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}
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@@ -187,6 +214,36 @@ static ssize_t set_scale(struct device *dev, struct device_attribute *attr,
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static DEVICE_ATTR(full_scale, S_IRUGO | S_IWUSR, show_scale, set_scale);
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+static ssize_t show_threshold(struct device *dev, struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct lis302dl_info *lis = dev_get_drvdata(dev);
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+
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+ return sprintf(buf, "%d\n", lis->threshold);
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+}
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+
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+static ssize_t set_threshold(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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+ u32 val;
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+
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+ if (sscanf(buf, "%d\n", &val) != 1)
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+ return -EINVAL;
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+ if (val < 0 || val > 255)
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+ return -ERANGE;
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+
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+ /* Set the threshold and write it out if the device is used */
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+ lis->threshold = val;
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+ if (lis->flags & LIS302DL_F_INPUT_OPEN)
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+ (lis->pdata->lis302dl_bitbang_reg_write)(lis,
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+ LIS302DL_REG_FF_WU_THS_1, lis->threshold);
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+
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+ return count;
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+}
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+
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+static DEVICE_ATTR(threshold, S_IRUGO | S_IWUSR, show_threshold, set_threshold);
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+
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static ssize_t lis302dl_dump(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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@@ -436,6 +493,7 @@ static DEVICE_ATTR(freefall_wakeup_2, S_IRUGO | S_IWUSR, show_freefall_2,
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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_threshold.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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@@ -454,17 +512,32 @@ static int lis302dl_input_open(struct input_dev *inp)
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struct lis302dl_info *lis = inp->private;
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u_int8_t ctrl1 = LIS302DL_CTRL1_PD | LIS302DL_CTRL1_Xen |
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LIS302DL_CTRL1_Yen | LIS302DL_CTRL1_Zen;
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+ u_int8_t ctrl2 = LIS302DL_CTRL2_HPFF1;
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unsigned long flags;
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local_irq_save(flags);
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/* make sure we're powered up and generate data ready */
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__reg_set_bit_mask(lis, LIS302DL_REG_CTRL1, ctrl1, ctrl1);
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+ (lis->pdata->lis302dl_bitbang_reg_write)(lis, LIS302DL_REG_CTRL2,
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+ ctrl2);
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+ (lis->pdata->lis302dl_bitbang_reg_write)(lis,
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+ LIS302DL_REG_FF_WU_THS_1, lis->threshold);
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+ (lis->pdata->lis302dl_bitbang_reg_write)(lis,
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+ LIS302DL_REG_FF_WU_DURATION_1, 0);
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+
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+ /* Clear the HP filter "starting point" */
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+ (lis->pdata->lis302dl_bitbang_reg_read)(lis,
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+ LIS302DL_REG_HP_FILTER_RESET);
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+ (lis->pdata->lis302dl_bitbang_reg_write)(lis,
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+ LIS302DL_REG_FF_WU_CFG_1, LIS302DL_FFWUCFG_XHIE |
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+ LIS302DL_FFWUCFG_YHIE | LIS302DL_FFWUCFG_ZHIE);
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+
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lis->flags |= LIS302DL_F_INPUT_OPEN;
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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_sample)(lis);
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+ lis302dl_bitbang_read_sample(lis);
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local_irq_restore(flags);
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@@ -567,6 +640,8 @@ static int __devinit lis302dl_probe(struct platform_device *pdev)
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set_bit(BTN_Y, lis->input_dev->keybit);
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set_bit(BTN_Z, lis->input_dev->keybit);
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*/
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+ lis->threshold = 1;
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+
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lis->input_dev->private = lis;
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lis->input_dev->name = pdata->name;
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/* SPI Bus not defined as a valid bus for input subsystem*/
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@@ -617,8 +692,8 @@ static int __devinit lis302dl_probe(struct platform_device *pdev)
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(lis->pdata->lis302dl_bitbang_reg_write)(lis,
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LIS302DL_REG_CTRL3, LIS302DL_CTRL3_IHL);
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- __lis302dl_int_mode(lis->dev, 1, LIS302DL_INTMODE_DATA_READY);
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- __lis302dl_int_mode(lis->dev, 2, LIS302DL_INTMODE_DATA_READY);
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+ __lis302dl_int_mode(lis->dev, 1, LIS302DL_INTMODE_FF_WU_12);
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+ __lis302dl_int_mode(lis->dev, 2, LIS302DL_INTMODE_FF_WU_12);
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(lis->pdata->lis302dl_bitbang_reg_read)(lis, LIS302DL_REG_STATUS);
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(lis->pdata->lis302dl_bitbang_reg_read)(lis, LIS302DL_REG_FF_WU_SRC_1);
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diff --git a/include/linux/lis302dl.h b/include/linux/lis302dl.h
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index 4578db4..f3f994d 100644
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--- a/include/linux/lis302dl.h
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+++ b/include/linux/lis302dl.h
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@@ -16,6 +16,8 @@ struct lis302dl_platform_data {
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unsigned long pin_miso;
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int open_drain;
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int interrupt;
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+ void (*lis302dl_bitbang)(struct lis302dl_info *lis, u8 *tx,
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+ int tx_bytes, u8 *rx, int rx_bytes);
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void (*lis302dl_bitbang_read_sample)(struct lis302dl_info *);
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void (*lis302dl_suspend_io)(struct lis302dl_info *, int resuming);
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int (*lis302dl_bitbang_reg_read)(struct lis302dl_info *, u8 reg);
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@@ -28,6 +30,7 @@ struct lis302dl_info {
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struct device *dev;
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struct input_dev *input_dev;
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unsigned int flags;
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+ unsigned int threshold;
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u_int8_t regs[0x40];
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};
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--
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1.5.6.5
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