path: root/recipes/linux/linux-openmoko-2.6.32/0002-accels.patch.patch

From b96dbc75c274014171a53da13686bd90d239c023 Mon Sep 17 00:00:00 2001
From: Radek Polak <psonek2@seznam.cz>
Date: Fri, 9 Apr 2010 09:15:40 +0200
Subject: [PATCH 02/14] accels.patch

adds support for accelerometers. You will need include/linux/lis302dl.h and
drivers/input/misc/lis302dl.c from andy-tracking. The patch needs
spi_bitbang_transfer_sync() and bitbang_work() to be ported correctly (some
fixes from original 2.6.32 are missing).

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
---
 arch/arm/mach-s3c2410/include/mach/spi-gpio.h |    3 +-
 arch/arm/mach-s3c2442/mach-gta02.c            |  157 ++++
 drivers/input/misc/Kconfig                    |    9 +
 drivers/input/misc/Makefile                   |    1 +
 drivers/input/misc/lis302dl.c                 |  952 +++++++++++++++++++++++++
 drivers/spi/spi_bitbang.c                     |  231 ++++---
 drivers/spi/spi_s3c24xx_gpio.c                |    7 +-
 include/linux/lis302dl.h                      |  152 ++++
 include/linux/spi/spi.h                       |   30 +
 include/linux/spi/spi_bitbang.h               |    5 +
 10 files changed, 1433 insertions(+), 114 deletions(-)
 create mode 100644 drivers/input/misc/lis302dl.c
 create mode 100644 include/linux/lis302dl.h

diff --git a/arch/arm/mach-s3c2410/include/mach/spi-gpio.h b/arch/arm/mach-s3c2410/include/mach/spi-gpio.h
index 980a099..0ff8949 100644
--- a/arch/arm/mach-s3c2410/include/mach/spi-gpio.h
+++ b/arch/arm/mach-s3c2410/include/mach/spi-gpio.h
@@ -21,7 +21,8 @@ struct s3c2410_spigpio_info {
 	int			 num_chipselect;
 	int			 bus_num;
 
-	void (*chip_select)(struct s3c2410_spigpio_info *spi, int cs);
+	int			 non_blocking_transfer;
+	void (*chip_select)(struct s3c2410_spigpio_info *spi, int csid, int cs);
 };
 
 
diff --git a/arch/arm/mach-s3c2442/mach-gta02.c b/arch/arm/mach-s3c2442/mach-gta02.c
index 7965cad..0675181 100644
--- a/arch/arm/mach-s3c2442/mach-gta02.c
+++ b/arch/arm/mach-s3c2442/mach-gta02.c
@@ -63,6 +63,7 @@
 
 #include <linux/input.h>
 #include <linux/gpio_keys.h>
+#include <linux/lis302dl.h>
 
 #include <linux/leds.h>
 #include <linux/leds_pwm.h>
@@ -120,6 +121,22 @@
 #include <linux/input/touchscreen/ts_filter_group.h>
 #endif
 
+#define S3C2410_GPIONO(bank,offset) ((bank) + (offset))
+
+#define S3C2410_GPIO_BANKD   (32*3)
+#define S3C2410_GPIO_BANKG   (32*6)
+
+#define S3C2410_GPG5          S3C2410_GPIONO(S3C2410_GPIO_BANKG, 5)
+#define S3C2410_GPG6          S3C2410_GPIONO(S3C2410_GPIO_BANKG, 6)
+#define S3C2410_GPG7          S3C2410_GPIONO(S3C2410_GPIO_BANKG, 7)
+#define S3C2410_GPD12         S3C2410_GPIONO(S3C2410_GPIO_BANKD, 12)
+#define S3C2410_GPD13         S3C2410_GPIONO(S3C2410_GPIO_BANKD, 13)
+
+#define	BITBANG_CS_ACTIVE	1	/* normally nCS, active low */
+#define	BITBANG_CS_INACTIVE	0
+
+#define S3C_SYSTEM_REV_ATAG GTA02v6_SYSTEM_REV
+
 struct pcf50633 *gta02_pcf;
 
 /*
@@ -775,6 +792,60 @@ const struct jbt6k74_platform_data jbt6k74_pdata = {
 	.gpio_reset = GTA02_GPIO_GLAMO(4),
 };
 
+/*----------- SPI: Accelerometers attached to SPI of s3c244x ----------------- */
+
+void gta02_lis302dl_suspend_io(struct lis302dl_info *lis, int resume)
+{
+	struct lis302dl_platform_data *pdata = lis->pdata;
+
+	if (!resume) {
+		 /*
+		 * we don't want to power them with a high level
+		 * because GSENSOR_3V3 is not up during suspend
+		 */
+		s3c2410_gpio_setpin(pdata->pin_chip_select, 0);
+		s3c2410_gpio_setpin(pdata->pin_clk, 0);
+		s3c2410_gpio_setpin(pdata->pin_mosi, 0);
+		/* misnomer: it is a pullDOWN in 2442 */
+		s3c2410_gpio_pullup(pdata->pin_miso, 1);
+		return;
+	}
+
+	/* back to normal */
+	s3c2410_gpio_setpin(pdata->pin_chip_select, 1);
+	s3c2410_gpio_setpin(pdata->pin_clk, 1);
+	/* misnomer: it is a pullDOWN in 2442 */
+	s3c2410_gpio_pullup(pdata->pin_miso, 0);
+
+	s3c2410_gpio_cfgpin(pdata->pin_chip_select, S3C2410_GPIO_OUTPUT);
+	s3c2410_gpio_cfgpin(pdata->pin_clk, S3C2410_GPIO_OUTPUT);
+	s3c2410_gpio_cfgpin(pdata->pin_mosi, S3C2410_GPIO_OUTPUT);
+	s3c2410_gpio_cfgpin(pdata->pin_miso, S3C2410_GPIO_INPUT);
+
+}
+
+struct lis302dl_platform_data lis302_pdata_top = {
+		.name		= "lis302-1 (top)",
+		.pin_chip_select= S3C2410_GPD12,
+		.pin_clk	= S3C2410_GPG7,
+		.pin_mosi	= S3C2410_GPG6,
+		.pin_miso	= S3C2410_GPG5,
+		.interrupt	= GTA02_IRQ_GSENSOR_1,
+		.open_drain	= 1, /* altered at runtime by PCB rev */
+		.lis302dl_suspend_io = gta02_lis302dl_suspend_io,
+};
+
+struct lis302dl_platform_data lis302_pdata_bottom = {
+		.name		= "lis302-2 (bottom)",
+		.pin_chip_select= S3C2410_GPD13,
+		.pin_clk	= S3C2410_GPG7,
+		.pin_mosi	= S3C2410_GPG6,
+		.pin_miso	= S3C2410_GPG5,
+		.interrupt	= GTA02_IRQ_GSENSOR_2,
+		.open_drain	= 1, /* altered at runtime by PCB rev */
+		.lis302dl_suspend_io = gta02_lis302dl_suspend_io,
+};
+
 static struct spi_board_info gta02_spi_board_info[] = {
 	{
 		.modalias	= "jbt6k74",
@@ -785,6 +856,81 @@ static struct spi_board_info gta02_spi_board_info[] = {
 		.bus_num	= 2,
 		.chip_select = 0
 	},
+	{
+		.modalias	= "lis302dl",
+		/* platform_data */
+		.platform_data	= &lis302_pdata_top,
+		/* controller_data */
+		/* irq */
+		.max_speed_hz	= 100 * 1000,
+		.bus_num	= 3,
+		.chip_select	= 0,
+	},
+	{
+		.modalias	= "lis302dl",
+		/* platform_data */
+		.platform_data	= &lis302_pdata_bottom,
+		/* controller_data */
+		/* irq */
+		.max_speed_hz	= 100 * 1000,
+		.bus_num	= 3,
+		.chip_select	= 1,
+	},
+};
+
+static void gta02_lis302_chip_select(struct s3c2410_spigpio_info *info, int csid, int cs)
+{
+
+	/*
+	 * Huh... "quirk"... CS on this device is not really "CS" like you can
+	 * expect.
+	 *
+	 * When it is 0 it selects SPI interface mode.
+	 * When it is 1 it selects I2C interface mode.
+	 *
+	 * Because we have 2 devices on one interface we have to make sure
+	 * that the "disabled" device (actually in I2C mode) don't think we're
+	 * talking to it.
+	 *
+	 * When we talk to the "enabled" device, the "disabled" device sees
+	 * the clocks as I2C clocks, creating havoc.
+	 *
+	 * I2C sees MOSI going LOW while CLK HIGH as a START action, thus we
+	 * must ensure this is never issued.
+	 */
+
+	int cs_gpio, other_cs_gpio;
+
+	cs_gpio = csid ? S3C2410_GPD13 : S3C2410_GPD12;
+	other_cs_gpio = (1 - csid) ? S3C2410_GPD13 : S3C2410_GPD12;
+
+
+	if (cs == BITBANG_CS_ACTIVE) {
+		s3c2410_gpio_setpin(other_cs_gpio, 1);
+		s3c2410_gpio_setpin(cs_gpio, 1);
+		s3c2410_gpio_setpin(info->pin_clk, 1);
+		s3c2410_gpio_setpin(cs_gpio, 0);
+	} else {
+		s3c2410_gpio_setpin(cs_gpio, 1);
+		s3c2410_gpio_setpin(other_cs_gpio, 1);
+	}
+}
+
+static struct s3c2410_spigpio_info gta02_spigpio_cfg = {
+	.pin_clk	= S3C2410_GPG7,
+	.pin_mosi	= S3C2410_GPG6,
+	.pin_miso	= S3C2410_GPG5,
+	.bus_num	= 3,
+	.num_chipselect	= 2,
+	.chip_select	= gta02_lis302_chip_select,
+	.non_blocking_transfer = 1,
+};
+
+static struct platform_device gta02_spi_gpio_dev = {
+	.name		= "spi_s3c24xx_gpio",
+	.dev = {
+		.platform_data = &gta02_spigpio_cfg,
+	},
 };
 
 /* BQ27000 Battery */
@@ -1135,6 +1281,7 @@ static struct platform_device *gta02_devices[] __initdata = {
 static struct platform_device *gta02_devices_pmu_children[] = {
 	&s3c_device_ts,
 	&gta02_glamo_dev,
+	&gta02_spi_gpio_dev,
 	&s3c_device_timer[2],
 	&gta02_hdq_device,
 	&gta02_gps_userspace_consumer
@@ -1361,6 +1508,16 @@ static void __init gta02_machine_init(void)
 	/* Set the panic callback to make AUX LED blink at ~5Hz. */
 	panic_blink = gta02_panic_blink;
 
+	switch (S3C_SYSTEM_REV_ATAG) {
+	case GTA02v6_SYSTEM_REV:
+		/* we need push-pull interrupt from motion sensors */
+		lis302_pdata_top.open_drain = 0;
+		lis302_pdata_bottom.open_drain = 0;
+		break;
+	default:
+		break;
+	}
+
 	s3c_device_ts.name = "s3c2440-ts";
 
 	bus_register_notifier(&platform_bus_type, &gta02_device_register_notifier);
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index a9bb254..2e9bc5d 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -317,4 +317,13 @@ config INPUT_PCAP
 	  To compile this driver as a module, choose M here: the
 	  module will be called pcap_keys.
 
+config INPUT_LIS302DL
+	tristate "STmicro LIS302DL 3-axis accelerometer"
+	depends on SPI_MASTER
+	help
+	  SPI driver for the STmicro LIS302DL 3-axis accelerometer.
+
+	  The userspece interface is a 3-axis (X/Y/Z) relative movement
+	  Linux input device, reporting REL_[XYZ] events.
+
 endif
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index a8b8485..7e63293 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -30,4 +30,5 @@ obj-$(CONFIG_INPUT_WINBOND_CIR)		+= winbond-cir.o
 obj-$(CONFIG_INPUT_WISTRON_BTNS)	+= wistron_btns.o
 obj-$(CONFIG_INPUT_WM831X_ON)		+= wm831x-on.o
 obj-$(CONFIG_INPUT_YEALINK)		+= yealink.o
+obj-$(CONFIG_INPUT_LIS302DL)		+= lis302dl.o
 
diff --git a/drivers/input/misc/lis302dl.c b/drivers/input/misc/lis302dl.c
new file mode 100644
index 0000000..d345bfb
--- /dev/null
+++ b/drivers/input/misc/lis302dl.c
@@ -0,0 +1,952 @@
+/* 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_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,
+	LIS302DL_REG_CTRL1,
+};
+
+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");
+
+	/* 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);
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index f1db395..5c50329 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -253,134 +253,139 @@ static int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t)
  * Drivers can provide word-at-a-time i/o primitives, or provide
  * transfer-at-a-time ones to leverage dma or fifo hardware.
  */
-static void bitbang_work(struct work_struct *work)
+/* Synchronous non blocking transfer */
+int
+spi_bitbang_transfer_sync(struct spi_device *spi, struct spi_message *m)
 {
-	struct spi_bitbang	*bitbang =
-		container_of(work, struct spi_bitbang, work);
-	unsigned long		flags;
-	int			do_setup = -1;
-	int			(*setup_transfer)(struct spi_device *,
-					struct spi_transfer *);
+	struct spi_bitbang *bitbang = spi_master_get_devdata(spi->master);
+	struct spi_transfer *t;
+	unsigned long flags;
+	int cs_change = 1;
+	int status;
+	int nsecs;
+	int (*setup_transfer)(struct spi_device *, struct spi_transfer *);
+
+	/* FIXME this is made-up ... the correct value is known to
+	 * word-at-a-time bitbang code, and presumably chipselect()
+	 * should enforce these requirements too?
+	 */
+	nsecs = 100;
+	cs_change = 1;
+	status = 0;
+	setup_transfer = NULL;
+
+	local_irq_save(flags);
+	list_for_each_entry (t, &m->transfers, transfer_list) {
+		/* override or restore speed and wordsize */
+		if (t->speed_hz || t->bits_per_word) {
+			setup_transfer = bitbang->setup_transfer;
+			if (!setup_transfer) {
+				status = -ENOPROTOOPT;
+				break;
+			}
+		}
+		if (setup_transfer) {
+			status = setup_transfer(spi, t);
+			if (status < 0)
+				break;
+		}
 
-	setup_transfer = bitbang->setup_transfer;
+		/* set up default clock polarity, and activate chip;
+		 * this implicitly updates clock and spi modes as
+		 * previously recorded for this device via setup().
+		 * (and also deselects any other chip that might be
+		 * selected ...)
+		 */
 
-	spin_lock_irqsave(&bitbang->lock, flags);
-	bitbang->busy = 1;
-	while (!list_empty(&bitbang->queue)) {
-		struct spi_message	*m;
-		struct spi_device	*spi;
-		unsigned		nsecs;
-		struct spi_transfer	*t = NULL;
-		unsigned		tmp;
-		unsigned		cs_change;
-		int			status;
+		if (cs_change) {
+			bitbang->chipselect(spi, BITBANG_CS_ACTIVE);
+			ndelay(nsecs);
+		}
 
-		m = container_of(bitbang->queue.next, struct spi_message,
-				queue);
-		list_del_init(&m->queue);
-		spin_unlock_irqrestore(&bitbang->lock, flags);
+		cs_change = t->cs_change;
+		if (!t->tx_buf && !t->rx_buf && t->len) {
+			status = -EINVAL;
+			break;
+		}
 
-		/* FIXME this is made-up ... the correct value is known to
-		 * word-at-a-time bitbang code, and presumably chipselect()
-		 * should enforce these requirements too?
+		/* transfer data.  the lower level code handles any
+		 * new dma mappings it needs. our caller always gave
+		 * us dma-safe buffers.
 		 */
-		nsecs = 100;
+		if (t->len) {
+			/* REVISIT dma API still needs a designated
+			 * DMA_ADDR_INVALID; ~0 might be better.
+			 */
+			if (!m->is_dma_mapped)
+				t->rx_dma = t->tx_dma = 0;
+			status = bitbang->txrx_bufs(spi, t);
+		}
 
-		spi = m->spi;
-		tmp = 0;
-		cs_change = 1;
+		if (status > 0)
+			m->actual_length += status;
+		if (status != t->len) {
+			/* always report some kind of error */
+			if (status >= 0)
+				status = -EREMOTEIO;
+			break;
+		}
 		status = 0;
+			/* protocol tweaks before next transfer */
+		if (t->delay_usecs)
+			udelay(t->delay_usecs);
+			if (!cs_change)
+			continue;
+		if (t->transfer_list.next == &m->transfers)
+			break;
+			/* sometimes a short mid-message deselect of the chip
+		 * may be needed to terminate a mode or command
+		 */
+		ndelay(nsecs);
+		bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
+		ndelay(nsecs);
+	}
 
-		list_for_each_entry (t, &m->transfers, transfer_list) {
-
-			/* override speed or wordsize? */
-			if (t->speed_hz || t->bits_per_word)
-				do_setup = 1;
-
-			/* init (-1) or override (1) transfer params */
-			if (do_setup != 0) {
-				if (!setup_transfer) {
-					status = -ENOPROTOOPT;
-					break;
-				}
-				status = setup_transfer(spi, t);
-				if (status < 0)
-					break;
-			}
+	m->status = status;
+	if (m->complete)
+		m->complete(m->context);
 
-			/* set up default clock polarity, and activate chip;
-			 * this implicitly updates clock and spi modes as
-			 * previously recorded for this device via setup().
-			 * (and also deselects any other chip that might be
-			 * selected ...)
-			 */
-			if (cs_change) {
-				bitbang->chipselect(spi, BITBANG_CS_ACTIVE);
-				ndelay(nsecs);
-			}
-			cs_change = t->cs_change;
-			if (!t->tx_buf && !t->rx_buf && t->len) {
-				status = -EINVAL;
-				break;
-			}
+	/* restore speed and wordsize */
+	if (setup_transfer)
+		setup_transfer(spi, NULL);
 
-			/* transfer data.  the lower level code handles any
-			 * new dma mappings it needs. our caller always gave
-			 * us dma-safe buffers.
-			 */
-			if (t->len) {
-				/* REVISIT dma API still needs a designated
-				 * DMA_ADDR_INVALID; ~0 might be better.
-				 */
-				if (!m->is_dma_mapped)
-					t->rx_dma = t->tx_dma = 0;
-				status = bitbang->txrx_bufs(spi, t);
-			}
-			if (status > 0)
-				m->actual_length += status;
-			if (status != t->len) {
-				/* always report some kind of error */
-				if (status >= 0)
-					status = -EREMOTEIO;
-				break;
-			}
-			status = 0;
-
-			/* protocol tweaks before next transfer */
-			if (t->delay_usecs)
-				udelay(t->delay_usecs);
+	/* normally deactivate chipselect ... unless no error and
+	 * cs_change has hinted that the next message will probably
+	 * be for this chip too.
+	 */
+	if (!(status == 0 && cs_change)) {
+		ndelay(nsecs);
+		bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
+		ndelay(nsecs);
+	}
 
-			if (!cs_change)
-				continue;
-			if (t->transfer_list.next == &m->transfers)
-				break;
+	local_irq_restore(flags);
 
-			/* sometimes a short mid-message deselect of the chip
-			 * may be needed to terminate a mode or command
-			 */
-			ndelay(nsecs);
-			bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
-			ndelay(nsecs);
-		}
+	return status;
+}
+EXPORT_SYMBOL_GPL(spi_bitbang_transfer_sync);
 
-		m->status = status;
-		m->complete(m->context);
+static void bitbang_work(struct work_struct *work)
+{
+	struct spi_bitbang	*bitbang =
+		container_of(work, struct spi_bitbang, work);
+	unsigned long		flags;
 
-		/* restore speed and wordsize if it was overridden */
-		if (do_setup == 1)
-			setup_transfer(spi, NULL);
-		do_setup = 0;
+	spin_lock_irqsave(&bitbang->lock, flags);
+	bitbang->busy = 1;
+	while (!list_empty(&bitbang->queue)) {
+		struct spi_message	*m;
 
-		/* normally deactivate chipselect ... unless no error and
-		 * cs_change has hinted that the next message will probably
-		 * be for this chip too.
-		 */
-		if (!(status == 0 && cs_change)) {
-			ndelay(nsecs);
-			bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
-			ndelay(nsecs);
-		}
+		m = container_of(bitbang->queue.next, struct spi_message,
+				queue);
+		list_del_init(&m->queue);
 
+		spin_unlock_irqrestore(&bitbang->lock, flags);
+		spi_bitbang_transfer_sync(m->spi, m);
 		spin_lock_irqsave(&bitbang->lock, flags);
 	}
 	bitbang->busy = 0;
@@ -455,6 +460,10 @@ int spi_bitbang_start(struct spi_bitbang *bitbang)
 
 	if (!bitbang->master->transfer)
 		bitbang->master->transfer = spi_bitbang_transfer;
+
+	if (!bitbang->master->transfer_sync && bitbang->non_blocking_transfer)
+		bitbang->master->transfer_sync = spi_bitbang_transfer_sync;
+
 	if (!bitbang->txrx_bufs) {
 		bitbang->use_dma = 0;
 		bitbang->txrx_bufs = spi_bitbang_bufs;
diff --git a/drivers/spi/spi_s3c24xx_gpio.c b/drivers/spi/spi_s3c24xx_gpio.c
index bbf9371..5685b78 100644
--- a/drivers/spi/spi_s3c24xx_gpio.c
+++ b/drivers/spi/spi_s3c24xx_gpio.c
@@ -92,7 +92,7 @@ static void s3c2410_spigpio_chipselect(struct spi_device *dev, int value)
 	struct s3c2410_spigpio *sg = spidev_to_sg(dev);
 
 	if (sg->info && sg->info->chip_select)
-		(sg->info->chip_select)(sg->info, value);
+		(sg->info->chip_select)(sg->info, dev->chip_select, value);
 }
 
 static int s3c2410_spigpio_probe(struct platform_device *dev)
@@ -113,14 +113,17 @@ static int s3c2410_spigpio_probe(struct platform_device *dev)
 
 	platform_set_drvdata(dev, sp);
 
-	/* copy in the plkatform data */
+	/* copy in the platform data */
 	info = sp->info = dev->dev.platform_data;
 
+	master->num_chipselect = info->num_chipselect;
+
 	/* setup spi bitbang adaptor */
 	sp->bitbang.master = spi_master_get(master);
 	sp->bitbang.master->bus_num = info->bus_num;
 	sp->bitbang.master->num_chipselect = info->num_chipselect;
 	sp->bitbang.chipselect = s3c2410_spigpio_chipselect;
+	sp->bitbang.non_blocking_transfer = info->non_blocking_transfer;
 
 	sp->bitbang.txrx_word[SPI_MODE_0] = s3c2410_spigpio_txrx_mode0;
 	sp->bitbang.txrx_word[SPI_MODE_1] = s3c2410_spigpio_txrx_mode1;
diff --git a/include/linux/lis302dl.h b/include/linux/lis302dl.h
new file mode 100644
index 0000000..0c1fc30
--- /dev/null
+++ b/include/linux/lis302dl.h
@@ -0,0 +1,152 @@
+#ifndef _LINUX_LIS302DL_H
+#define _LINUX_LIS302DL_H
+
+#include <linux/types.h>
+#include <linux/spi/spi.h>
+#include <linux/input.h>
+#include <linux/workqueue.h>
+
+struct lis302dl_info;
+
+struct lis302dl_platform_data {
+	char *name;
+	unsigned long pin_chip_select;
+	unsigned long pin_clk;
+	unsigned long pin_mosi;
+	unsigned long pin_miso;
+	int open_drain;
+	int interrupt;
+	void (*lis302dl_suspend_io)(struct lis302dl_info *, int resuming);
+};
+
+struct lis302dl_info {
+	struct lis302dl_platform_data *pdata;
+	struct device *dev;
+	struct input_dev *input_dev;
+	unsigned int flags;
+	unsigned int threshold;
+	unsigned int duration;
+	u32 overruns;
+	struct {
+		unsigned int threshold; /* mg */
+		unsigned int duration;  /* ms */
+	} wakeup;
+
+	struct spi_device *spi;
+	u_int8_t regs[0x40];
+};
+
+enum lis302dl_reg {
+	LIS302DL_REG_WHO_AM_I		= 0x0f,
+	LIS302DL_REG_CTRL1		= 0x20,
+	LIS302DL_REG_CTRL2		= 0x21,
+	LIS302DL_REG_CTRL3		= 0x22,
+	LIS302DL_REG_HP_FILTER_RESET	= 0x23,
+	LIS302DL_REG_STATUS		= 0x27,
+	LIS302DL_REG_OUT_X		= 0x29,
+	LIS302DL_REG_OUT_Y		= 0x2b,
+	LIS302DL_REG_OUT_Z		= 0x2d,
+	LIS302DL_REG_FF_WU_CFG_1	= 0x30,
+	LIS302DL_REG_FF_WU_SRC_1	= 0x31,
+	LIS302DL_REG_FF_WU_THS_1	= 0x32,
+	LIS302DL_REG_FF_WU_DURATION_1	= 0x33,
+	LIS302DL_REG_FF_WU_CFG_2	= 0x34,
+	LIS302DL_REG_FF_WU_SRC_2	= 0x35,
+	LIS302DL_REG_FF_WU_THS_2	= 0x36,
+	LIS302DL_REG_FF_WU_DURATION_2	= 0x37,
+	LIS302DL_REG_CLICK_CFG		= 0x38,
+	LIS302DL_REG_CLICK_SRC		= 0x39,
+	LIS302DL_REG_CLICK_THSY_X	= 0x3b,
+	LIS302DL_REG_CLICK_THSZ		= 0x3c,
+	LIS302DL_REG_CLICK_TIME_LIMIT	= 0x3d,
+	LIS302DL_REG_CLICK_LATENCY	= 0x3e,
+	LIS302DL_REG_CLICK_WINDOW	= 0x3f,
+};
+
+enum lis302dl_reg_ctrl1 {
+	LIS302DL_CTRL1_Xen		= 0x01,
+	LIS302DL_CTRL1_Yen		= 0x02,
+	LIS302DL_CTRL1_Zen		= 0x04,
+	LIS302DL_CTRL1_STM		= 0x08,
+	LIS302DL_CTRL1_STP		= 0x10,
+	LIS302DL_CTRL1_FS		= 0x20,
+	LIS302DL_CTRL1_PD		= 0x40,
+	LIS302DL_CTRL1_DR		= 0x80,
+};
+
+enum lis302dl_reg_ctrl2 {
+	LIS302DL_CTRL2_HPC1		= 0x01,
+	LIS302DL_CTRL2_HPC2		= 0x02,
+	LIS302DL_CTRL2_HPFF1		= 0x04,
+	LIS302DL_CTRL2_HPFF2		= 0x08,
+	LIS302DL_CTRL2_FDS		= 0x10,
+	LIS302DL_CTRL2_BOOT		= 0x40,
+	LIS302DL_CTRL2_SIM		= 0x80,
+};
+enum lis302dl_reg_ctrl3 {
+	LIS302DL_CTRL3_PP_OD		= 0x40,
+	LIS302DL_CTRL3_IHL		= 0x80,
+};
+
+enum lis302dl_reg_status {
+	LIS302DL_STATUS_XDA		= 0x01,
+	LIS302DL_STATUS_YDA		= 0x02,
+	LIS302DL_STATUS_ZDA		= 0x04,
+	LIS302DL_STATUS_XYZDA		= 0x08,
+	LIS302DL_STATUS_XOR		= 0x10,
+	LIS302DL_STATUS_YOR		= 0x20,
+	LIS302DL_STATUS_ZOR		= 0x40,
+	LIS302DL_STATUS_XYZOR		= 0x80,
+};
+
+/* Wakeup/freefall interrupt defs */
+enum lis302dl_reg_ffwucfg {
+	LIS302DL_FFWUCFG_XLIE		= 0x01,
+	LIS302DL_FFWUCFG_XHIE		= 0x02,
+	LIS302DL_FFWUCFG_YLIE		= 0x04,
+	LIS302DL_FFWUCFG_YHIE		= 0x08,
+	LIS302DL_FFWUCFG_ZLIE		= 0x10,
+	LIS302DL_FFWUCFG_ZHIE		= 0x20,
+	LIS302DL_FFWUCFG_LIR		= 0x40,
+	LIS302DL_FFWUCFG_AOI		= 0x80,
+};
+
+enum lis302dl_reg_ffwuths {
+	LIS302DL_FFWUTHS_DCRM		= 0x80,
+};
+
+enum lis302dl_reg_ffwusrc {
+	LIS302DL_FFWUSRC_XL		= 0x01,
+	LIS302DL_FFWUSRC_XH		= 0x02,
+	LIS302DL_FFWUSRC_YL		= 0x04,
+	LIS302DL_FFWUSRC_YH		= 0x08,
+	LIS302DL_FFWUSRC_ZL		= 0x10,
+	LIS302DL_FFWUSRC_ZH		= 0x20,
+	LIS302DL_FFWUSRC_IA		= 0x40,
+};
+
+enum lis302dl_reg_cloik_src {
+	LIS302DL_CLICKSRC_SINGLE_X	= 0x01,
+	LIS302DL_CLICKSRC_DOUBLE_X	= 0x02,
+	LIS302DL_CLICKSRC_SINGLE_Y	= 0x04,
+	LIS302DL_CLICKSRC_DOUBLE_Y	= 0x08,
+	LIS302DL_CLICKSRC_SINGLE_Z	= 0x10,
+	LIS302DL_CLICKSRC_DOUBLE_Z	= 0x20,
+	LIS302DL_CLICKSRC_IA		= 0x40,
+};
+
+#define LIS302DL_WHO_AM_I_MAGIC		0x3b
+
+#define LIS302DL_F_WUP_FF_1		0x0001	/* wake up from free fall */
+#define LIS302DL_F_WUP_FF_2		0x0002
+#define LIS302DL_F_WUP_FF		0x0003
+#define LIS302DL_F_WUP_CLICK	0x0004
+#define LIS302DL_F_POWER		0x0010
+#define LIS302DL_F_FS			0x0020 	/* ADC full scale */
+#define LIS302DL_F_INPUT_OPEN 	0x0040  /* Set if input device is opened */
+#define LIS302DL_F_IRQ_WAKE 	0x0080  /* IRQ is setup in wake mode */
+#define LIS302DL_F_DR			0x0100 	/* Data rate, 400Hz/100Hz */
+
+
+#endif /* _LINUX_LIS302DL_H */
+
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 97b60b3..9c5484b 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -291,6 +291,13 @@ struct spi_master {
 	int			(*transfer)(struct spi_device *spi,
 						struct spi_message *mesg);
 
+	/*
+	 * Synchronous non blocking transfer function. Should guarantee
+	 * data availability when it returns
+	 */
+	int			(*transfer_sync)(struct spi_device *spi,
+						struct spi_message *mesg);
+
 	/* called on release() to free memory provided by spi_master */
 	void			(*cleanup)(struct spi_device *spi);
 };
@@ -542,6 +549,29 @@ static inline void spi_message_free(struct spi_message *m)
 extern int spi_setup(struct spi_device *spi);
 extern int spi_async(struct spi_device *spi, struct spi_message *message);
 
+/**
+ * spi_non_blocking_transfer - Synchronous, non blocking transfer
+ * @spi: device with which data will be exchanged
+ * @message: describes the data transfers with optional completion handlers
+ * Context: any (irqs may be blocked, etc)
+ *
+ * Data is guaranteed to be written or read when this function returns.
+ *
+ * Note : This may not be supported by all spi masters.
+ */
+
+static inline int
+spi_non_blocking_transfer(struct spi_device *spi, struct spi_message *message)
+{
+	if (unlikely(!spi->master->transfer_sync)) {
+		dev_err(&spi->master->dev,
+				"non-blocking transfers not supported\n");
+		return -EIO;
+	}
+
+	return spi->master->transfer_sync(spi, message);
+}
+
 /*---------------------------------------------------------------------------*/
 
 /* All these synchronous SPI transfer routines are utilities layered
diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h
index eed4254..f92de01 100644
--- a/include/linux/spi/spi_bitbang.h
+++ b/include/linux/spi/spi_bitbang.h
@@ -31,6 +31,9 @@ struct spi_bitbang {
 	u8			use_dma;
 	u8			flags;		/* extra spi->mode support */
 
+	/* Support for synchronous non blocking transfers */
+	int 			non_blocking_transfer;
+
 	struct spi_master	*master;
 
 	/* setup_transfer() changes clock and/or wordsize to match settings
@@ -62,6 +65,8 @@ extern void spi_bitbang_cleanup(struct spi_device *spi);
 extern int spi_bitbang_transfer(struct spi_device *spi, struct spi_message *m);
 extern int spi_bitbang_setup_transfer(struct spi_device *spi,
 				      struct spi_transfer *t);
+extern int spi_bitbang_transfer_sync(struct spi_device *spi,
+				      struct spi_message *m);
 
 /* start or stop queue processing */
 extern int spi_bitbang_start(struct spi_bitbang *spi);
-- 
1.7.1