+++ /dev/null
-/* 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);
projects / openwrt / svn-archive / archive.git / blobdiff