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authorblogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>2012-10-05 10:12:53 +0000
committerblogic <blogic@3c298f89-4303-0410-b956-a3cf2f4a3e73>2012-10-05 10:12:53 +0000
commit5c105d9f3fd086aff195d3849dcf847d6b0bd927 (patch)
tree1229a11f725bfa58aa7c57a76898553bb5f6654a /target/linux/s3c24xx/files-2.6.30/drivers/input/misc
downloadopenwrt-5c105d9f3fd086aff195d3849dcf847d6b0bd927.tar.gz
openwrt-5c105d9f3fd086aff195d3849dcf847d6b0bd927.zip
branch Attitude Adjustment
git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/s3c24xx/files-2.6.30/drivers/input/misc')
-rw-r--r--target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c957
1 files changed, 957 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c b/target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c
new file mode 100644
index 000000000..dc6602a8e
--- /dev/null
+++ b/target/linux/s3c24xx/files-2.6.30/drivers/input/misc/lis302dl.c
@@ -0,0 +1,957 @@
+/* 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);