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openwrt-xburst/target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c

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