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iio: add LM3533 ambient-light-sensor driver

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Add sub-driver for the ambient-light-sensor interface on National
Semiconductor / TI LM3533 lighting power chips.

The sensor interface can be used to control the LEDs and backlights of
the chip through defining five light zones and three sets of
corresponding output-current values.

The driver provides raw and mean adc readings along with the current
light zone through sysfs. A threshold event can be generated on zone
changes. The ALS-control output values can be set per zone for the three
current output channels.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2012-05-21 14:18:06 +02:00 committed by Greg Kroah-Hartman
parent 2979460d7a
commit 9c8ea1b29b
6 changed files with 1023 additions and 0 deletions
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62
Documentation/ABI/testing/sysfs-bus-iio-light-lm3533-als Normal file
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@ -0,0 +1,62 @@
What: /sys/.../events/in_illuminance0_thresh_either_en
Date: April 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Event generated when channel passes one of the four thresholds
in each direction (rising|falling) and a zone change occurs.
The corresponding light zone can be read from
in_illuminance0_zone.
What: /sys/.../events/in_illuminance0_threshY_hysteresis
Date: May 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Get the hysteresis for thresholds Y, that is,
threshY_hysteresis = threshY_raising - threshY_falling
What: /sys/.../events/illuminance_threshY_falling_value
What: /sys/.../events/illuminance_threshY_raising_value
Date: April 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Specifies the value of threshold that the device is comparing
against for the events enabled by
in_illuminance0_thresh_either_en (0..255), where Y in 0..3.
Note that threshY_falling must be less than or equal to
threshY_raising.
These thresholds correspond to the eight zone-boundary
registers (boundaryY_{low,high}) and defines the five light
zones.
What: /sys/bus/iio/devices/iio:deviceX/in_illuminance0_zone
Date: April 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Get the current light zone (0..4) as defined by the
in_illuminance0_threshY_{falling,rising} thresholds.
What: /sys/bus/iio/devices/iio:deviceX/out_currentY_raw
Date: May 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Get output current for channel Y (0..255), that is,
out_currentY_currentZ_raw, where Z is the current zone.
What: /sys/bus/iio/devices/iio:deviceX/out_currentY_currentZ_raw
Date: May 2012
KernelVersion: 3.5
Contact: Johan Hovold <jhovold@gmail.com>
Description:
Set the output current for channel out_currentY when in zone
Z (0..255), where Y in 0..2 and Z in 0..4.
These values correspond to the ALS-mapper target registers for
ALS-mapper Y + 1.

1
drivers/iio/Kconfig
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@ -50,5 +50,6 @@ config IIO_CONSUMERS_PER_TRIGGER
source "drivers/iio/adc/Kconfig"
source "drivers/iio/amplifiers/Kconfig"
source "drivers/iio/light/Kconfig"
endif # IIO

1
drivers/iio/Makefile
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@ -11,3 +11,4 @@ obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o
obj-y += adc/
obj-y += amplifiers/
obj-y += light/

22
drivers/iio/light/Kconfig Normal file
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@ -0,0 +1,22 @@
#
# Light sensors
#
menu "Light sensors"
config SENSORS_LM3533
tristate "LM3533 ambient light sensor"
depends on MFD_LM3533
help
If you say yes here you get support for the ambient light sensor
interface on National Semiconductor / TI LM3533 Lighting Power
chips.
The sensor interface can be used to control the LEDs and backlights
of the chip through defining five light zones and three sets of
corresponding output-current values.
The driver provides raw and mean adc readings along with the current
light zone through sysfs. A threshold event can be generated on zone
changes. The ALS-control output values can be set per zone for the
three current output channels.
endmenu

5
drivers/iio/light/Makefile Normal file
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@ -0,0 +1,5 @@
#
# Makefile for IIO Light sensors
#
obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o

932
drivers/iio/light/lm3533-als.c Normal file
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@ -0,0 +1,932 @@
/*
* lm3533-als.c -- LM3533 Ambient Light Sensor driver
*
* Copyright (C) 2011-2012 Texas Instruments
*
* Author: Johan Hovold <jhovold@gmail.com>
*
* 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.
*/
#include <linux/atomic.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/mfd/core.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/mfd/lm3533.h>
#define LM3533_ALS_RESISTOR_MIN 1
#define LM3533_ALS_RESISTOR_MAX 127
#define LM3533_ALS_CHANNEL_CURRENT_MAX 2
#define LM3533_ALS_THRESH_MAX 3
#define LM3533_ALS_ZONE_MAX 4
#define LM3533_REG_ALS_RESISTOR_SELECT 0x30
#define LM3533_REG_ALS_CONF 0x31
#define LM3533_REG_ALS_ZONE_INFO 0x34
#define LM3533_REG_ALS_READ_ADC_RAW 0x37
#define LM3533_REG_ALS_READ_ADC_AVERAGE 0x38
#define LM3533_REG_ALS_BOUNDARY_BASE 0x50
#define LM3533_REG_ALS_TARGET_BASE 0x60
#define LM3533_ALS_ENABLE_MASK 0x01
#define LM3533_ALS_INPUT_MODE_MASK 0x02
#define LM3533_ALS_INT_ENABLE_MASK 0x01
#define LM3533_ALS_ZONE_SHIFT 2
#define LM3533_ALS_ZONE_MASK 0x1c
#define LM3533_ALS_FLAG_INT_ENABLED 1
struct lm3533_als {
struct lm3533 *lm3533;
struct platform_device *pdev;
unsigned long flags;
int irq;
atomic_t zone;
struct mutex thresh_mutex;
};
static int lm3533_als_get_adc(struct iio_dev *indio_dev, bool average,
int *adc)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 reg;
u8 val;
int ret;
if (average)
reg = LM3533_REG_ALS_READ_ADC_AVERAGE;
else
reg = LM3533_REG_ALS_READ_ADC_RAW;
ret = lm3533_read(als->lm3533, reg, &val);
if (ret) {
dev_err(&indio_dev->dev, "failed to read adc\n");
return ret;
}
*adc = val;
return 0;
}
static int _lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 val;
int ret;
ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val);
if (ret) {
dev_err(&indio_dev->dev, "failed to read zone\n");
return ret;
}
val = (val & LM3533_ALS_ZONE_MASK) >> LM3533_ALS_ZONE_SHIFT;
*zone = min_t(u8, val, LM3533_ALS_ZONE_MAX);
return 0;
}
static int lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone)
{
struct lm3533_als *als = iio_priv(indio_dev);
int ret;
if (test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags)) {
*zone = atomic_read(&als->zone);
} else {
ret = _lm3533_als_get_zone(indio_dev, zone);
if (ret)
return ret;
}
return 0;
}
/*
* channel output channel 0..2
* zone zone 0..4
*/
static inline u8 lm3533_als_get_target_reg(unsigned channel, unsigned zone)
{
return LM3533_REG_ALS_TARGET_BASE + 5 * channel + zone;
}
static int lm3533_als_get_target(struct iio_dev *indio_dev, unsigned channel,
unsigned zone, u8 *val)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 reg;
int ret;
if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX)
return -EINVAL;
if (zone > LM3533_ALS_ZONE_MAX)
return -EINVAL;
reg = lm3533_als_get_target_reg(channel, zone);
ret = lm3533_read(als->lm3533, reg, val);
if (ret)
dev_err(&indio_dev->dev, "failed to get target current\n");
return ret;
}
static int lm3533_als_set_target(struct iio_dev *indio_dev, unsigned channel,
unsigned zone, u8 val)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 reg;
int ret;
if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX)
return -EINVAL;
if (zone > LM3533_ALS_ZONE_MAX)
return -EINVAL;
reg = lm3533_als_get_target_reg(channel, zone);
ret = lm3533_write(als->lm3533, reg, val);
if (ret)
dev_err(&indio_dev->dev, "failed to set target current\n");
return ret;
}
static int lm3533_als_get_current(struct iio_dev *indio_dev, unsigned channel,
int *val)
{
u8 zone;
u8 target;
int ret;
ret = lm3533_als_get_zone(indio_dev, &zone);
if (ret)
return ret;
ret = lm3533_als_get_target(indio_dev, channel, zone, &target);
if (ret)
return ret;
*val = target;
return 0;
}
static int lm3533_als_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
int ret;
switch (mask) {
case 0:
switch (chan->type) {
case IIO_LIGHT:
ret = lm3533_als_get_adc(indio_dev, false, val);
break;
case IIO_CURRENT:
ret = lm3533_als_get_current(indio_dev, chan->channel,
val);
break;
default:
return -EINVAL;
}
break;
case IIO_CHAN_INFO_AVERAGE_RAW:
ret = lm3533_als_get_adc(indio_dev, true, val);
break;
default:
return -EINVAL;
}
if (ret)
return ret;
return IIO_VAL_INT;
}
#define CHANNEL_CURRENT(_channel) \
{ \
.type = IIO_CURRENT, \
.channel = _channel, \
.indexed = true, \
.output = true, \
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, \
}
static const struct iio_chan_spec lm3533_als_channels[] = {
{
.type = IIO_LIGHT,
.channel = 0,
.indexed = true,
.info_mask = (IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_RAW_SEPARATE_BIT),
},
CHANNEL_CURRENT(0),
CHANNEL_CURRENT(1),
CHANNEL_CURRENT(2),
};
static irqreturn_t lm3533_als_isr(int irq, void *dev_id)
{
struct iio_dev *indio_dev = dev_id;
struct lm3533_als *als = iio_priv(indio_dev);
u8 zone;
int ret;
/* Clear interrupt by reading the ALS zone register. */
ret = _lm3533_als_get_zone(indio_dev, &zone);
if (ret)
goto out;
atomic_set(&als->zone, zone);
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_EITHER),
iio_get_time_ns());
out:
return IRQ_HANDLED;
}
static int lm3533_als_set_int_mode(struct iio_dev *indio_dev, int enable)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 mask = LM3533_ALS_INT_ENABLE_MASK;
u8 val;
int ret;
if (enable)
val = mask;
else
val = 0;
ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, val, mask);
if (ret) {
dev_err(&indio_dev->dev, "failed to set int mode %d\n",
enable);
return ret;
}
return 0;
}
static int lm3533_als_get_int_mode(struct iio_dev *indio_dev, int *enable)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 mask = LM3533_ALS_INT_ENABLE_MASK;
u8 val;
int ret;
ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val);
if (ret) {
dev_err(&indio_dev->dev, "failed to get int mode\n");
return ret;
}
*enable = !!(val & mask);
return 0;
}
static inline u8 lm3533_als_get_threshold_reg(unsigned nr, bool raising)
{
u8 offset = !raising;
return LM3533_REG_ALS_BOUNDARY_BASE + 2 * nr + offset;
}
static int lm3533_als_get_threshold(struct iio_dev *indio_dev, unsigned nr,
bool raising, u8 *val)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 reg;
int ret;
if (nr > LM3533_ALS_THRESH_MAX)
return -EINVAL;
reg = lm3533_als_get_threshold_reg(nr, raising);
ret = lm3533_read(als->lm3533, reg, val);
if (ret)
dev_err(&indio_dev->dev, "failed to get threshold\n");
return ret;
}
static int lm3533_als_set_threshold(struct iio_dev *indio_dev, unsigned nr,
bool raising, u8 val)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 val2;
u8 reg, reg2;
int ret;
if (nr > LM3533_ALS_THRESH_MAX)
return -EINVAL;
reg = lm3533_als_get_threshold_reg(nr, raising);
reg2 = lm3533_als_get_threshold_reg(nr, !raising);
mutex_lock(&als->thresh_mutex);
ret = lm3533_read(als->lm3533, reg2, &val2);
if (ret) {
dev_err(&indio_dev->dev, "failed to get threshold\n");
goto out;
}
/*
* This device does not allow negative hysteresis (in fact, it uses
* whichever value is smaller as the lower bound) so we need to make
* sure that thresh_falling <= thresh_raising.
*/
if ((raising && (val < val2)) || (!raising && (val > val2))) {
ret = -EINVAL;
goto out;
}
ret = lm3533_write(als->lm3533, reg, val);
if (ret) {
dev_err(&indio_dev->dev, "failed to set threshold\n");
goto out;
}
out:
mutex_unlock(&als->thresh_mutex);
return ret;
}
static int lm3533_als_get_hysteresis(struct iio_dev *indio_dev, unsigned nr,
u8 *val)
{
struct lm3533_als *als = iio_priv(indio_dev);
u8 falling;
u8 raising;
int ret;
if (nr > LM3533_ALS_THRESH_MAX)
return -EINVAL;
mutex_lock(&als->thresh_mutex);
ret = lm3533_als_get_threshold(indio_dev, nr, false, &falling);
if (ret)
goto out;
ret = lm3533_als_get_threshold(indio_dev, nr, true, &raising);
if (ret)
goto out;
*val = raising - falling;
out:
mutex_unlock(&als->thresh_mutex);
return ret;
}
static int show_thresh_either_en(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct lm3533_als *als = iio_priv(indio_dev);
int enable;
int ret;
if (als->irq) {
ret = lm3533_als_get_int_mode(indio_dev, &enable);
if (ret)
return ret;
} else {
enable = 0;
}
return scnprintf(buf, PAGE_SIZE, "%u\n", enable);
}
static int store_thresh_either_en(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct lm3533_als *als = iio_priv(indio_dev);
unsigned long enable;
bool int_enabled;
u8 zone;
int ret;
if (!als->irq)
return -EBUSY;
if (kstrtoul(buf, 0, &enable))
return -EINVAL;
int_enabled = test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
if (enable && !int_enabled) {
ret = lm3533_als_get_zone(indio_dev, &zone);
if (ret)
return ret;
atomic_set(&als->zone, zone);
set_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
}
ret = lm3533_als_set_int_mode(indio_dev, enable);
if (ret) {
if (!int_enabled)
clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
return ret;
}
if (!enable)
clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
return len;
}
static ssize_t show_zone(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
u8 zone;
int ret;
ret = lm3533_als_get_zone(indio_dev, &zone);
if (ret)
return ret;
return scnprintf(buf, PAGE_SIZE, "%u\n", zone);
}
enum lm3533_als_attribute_type {
LM3533_ATTR_TYPE_HYSTERESIS,
LM3533_ATTR_TYPE_TARGET,
LM3533_ATTR_TYPE_THRESH_FALLING,
LM3533_ATTR_TYPE_THRESH_RAISING,
};
struct lm3533_als_attribute {
struct device_attribute dev_attr;
enum lm3533_als_attribute_type type;
u8 val1;
u8 val2;
};
static inline struct lm3533_als_attribute *
to_lm3533_als_attr(struct device_attribute *attr)
{
return container_of(attr, struct lm3533_als_attribute, dev_attr);
}
static ssize_t show_als_attr(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr);
u8 val;
int ret;
switch (als_attr->type) {
case LM3533_ATTR_TYPE_HYSTERESIS:
ret = lm3533_als_get_hysteresis(indio_dev, als_attr->val1,
&val);
break;
case LM3533_ATTR_TYPE_TARGET:
ret = lm3533_als_get_target(indio_dev, als_attr->val1,
als_attr->val2, &val);
break;
case LM3533_ATTR_TYPE_THRESH_FALLING:
ret = lm3533_als_get_threshold(indio_dev, als_attr->val1,
false, &val);
break;
case LM3533_ATTR_TYPE_THRESH_RAISING:
ret = lm3533_als_get_threshold(indio_dev, als_attr->val1,
true, &val);
break;
default:
ret = -ENXIO;
}
if (ret)
return ret;
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static ssize_t store_als_attr(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr);
u8 val;
int ret;
if (kstrtou8(buf, 0, &val))
return -EINVAL;
switch (als_attr->type) {
case LM3533_ATTR_TYPE_TARGET:
ret = lm3533_als_set_target(indio_dev, als_attr->val1,
als_attr->val2, val);
break;
case LM3533_ATTR_TYPE_THRESH_FALLING:
ret = lm3533_als_set_threshold(indio_dev, als_attr->val1,
false, val);
break;
case LM3533_ATTR_TYPE_THRESH_RAISING:
ret = lm3533_als_set_threshold(indio_dev, als_attr->val1,
true, val);
break;
default:
ret = -ENXIO;
}
if (ret)
return ret;
return len;
}
#define ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) \
{ .dev_attr = __ATTR(_name, _mode, _show, _store), \
.type = _type, \
.val1 = _val1, \
.val2 = _val2 }
#define LM3533_ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2) \
struct lm3533_als_attribute lm3533_als_attr_##_name = \
ALS_ATTR(_name, _mode, _show, _store, _type, _val1, _val2)
#define ALS_TARGET_ATTR_RW(_channel, _zone) \
LM3533_ALS_ATTR(out_current##_channel##_current##_zone##_raw, \
S_IRUGO | S_IWUSR, \
show_als_attr, store_als_attr, \
LM3533_ATTR_TYPE_TARGET, _channel, _zone)
/*
* ALS output current values (ALS mapper targets)
*
* out_current[0-2]_current[0-4]_raw 0-255
*/
static ALS_TARGET_ATTR_RW(0, 0);
static ALS_TARGET_ATTR_RW(0, 1);
static ALS_TARGET_ATTR_RW(0, 2);
static ALS_TARGET_ATTR_RW(0, 3);
static ALS_TARGET_ATTR_RW(0, 4);
static ALS_TARGET_ATTR_RW(1, 0);
static ALS_TARGET_ATTR_RW(1, 1);
static ALS_TARGET_ATTR_RW(1, 2);
static ALS_TARGET_ATTR_RW(1, 3);
static ALS_TARGET_ATTR_RW(1, 4);
static ALS_TARGET_ATTR_RW(2, 0);
static ALS_TARGET_ATTR_RW(2, 1);
static ALS_TARGET_ATTR_RW(2, 2);
static ALS_TARGET_ATTR_RW(2, 3);
static ALS_TARGET_ATTR_RW(2, 4);
#define ALS_THRESH_FALLING_ATTR_RW(_nr) \
LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_falling_value, \
S_IRUGO | S_IWUSR, \
show_als_attr, store_als_attr, \
LM3533_ATTR_TYPE_THRESH_FALLING, _nr, 0)
#define ALS_THRESH_RAISING_ATTR_RW(_nr) \
LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_raising_value, \
S_IRUGO | S_IWUSR, \
show_als_attr, store_als_attr, \
LM3533_ATTR_TYPE_THRESH_RAISING, _nr, 0)
/*
* ALS Zone thresholds (boundaries)
*
* in_illuminance0_thresh[0-3]_falling_value 0-255
* in_illuminance0_thresh[0-3]_raising_value 0-255
*/
static ALS_THRESH_FALLING_ATTR_RW(0);
static ALS_THRESH_FALLING_ATTR_RW(1);
static ALS_THRESH_FALLING_ATTR_RW(2);
static ALS_THRESH_FALLING_ATTR_RW(3);
static ALS_THRESH_RAISING_ATTR_RW(0);
static ALS_THRESH_RAISING_ATTR_RW(1);
static ALS_THRESH_RAISING_ATTR_RW(2);
static ALS_THRESH_RAISING_ATTR_RW(3);
#define ALS_HYSTERESIS_ATTR_RO(_nr) \
LM3533_ALS_ATTR(in_illuminance0_thresh##_nr##_hysteresis, \
S_IRUGO, show_als_attr, NULL, \
LM3533_ATTR_TYPE_HYSTERESIS, _nr, 0)
/*
* ALS Zone threshold hysteresis
*
* threshY_hysteresis = threshY_raising - threshY_falling
*
* in_illuminance0_thresh[0-3]_hysteresis 0-255
* in_illuminance0_thresh[0-3]_hysteresis 0-255
*/
static ALS_HYSTERESIS_ATTR_RO(0);
static ALS_HYSTERESIS_ATTR_RO(1);
static ALS_HYSTERESIS_ATTR_RO(2);
static ALS_HYSTERESIS_ATTR_RO(3);
#define ILLUMINANCE_ATTR_RO(_name) \
DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO, show_##_name, NULL)
#define ILLUMINANCE_ATTR_RW(_name) \
DEVICE_ATTR(in_illuminance0_##_name, S_IRUGO | S_IWUSR , \
show_##_name, store_##_name)
/*
* ALS Zone threshold-event enable
*
* in_illuminance0_thresh_either_en 0,1
*/
static ILLUMINANCE_ATTR_RW(thresh_either_en);
/*
* ALS Current Zone
*
* in_illuminance0_zone 0-4
*/
static ILLUMINANCE_ATTR_RO(zone);
static struct attribute *lm3533_als_event_attributes[] = {
&dev_attr_in_illuminance0_thresh_either_en.attr,
&lm3533_als_attr_in_illuminance0_thresh0_falling_value.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh0_hysteresis.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh0_raising_value.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh1_falling_value.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh1_hysteresis.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh1_raising_value.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh2_falling_value.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh2_hysteresis.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh2_raising_value.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh3_falling_value.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh3_hysteresis.dev_attr.attr,
&lm3533_als_attr_in_illuminance0_thresh3_raising_value.dev_attr.attr,
NULL
};
static struct attribute_group lm3533_als_event_attribute_group = {
.attrs = lm3533_als_event_attributes
};
static struct attribute *lm3533_als_attributes[] = {
&dev_attr_in_illuminance0_zone.attr,
&lm3533_als_attr_out_current0_current0_raw.dev_attr.attr,
&lm3533_als_attr_out_current0_current1_raw.dev_attr.attr,
&lm3533_als_attr_out_current0_current2_raw.dev_attr.attr,
&lm3533_als_attr_out_current0_current3_raw.dev_attr.attr,
&lm3533_als_attr_out_current0_current4_raw.dev_attr.attr,
&lm3533_als_attr_out_current1_current0_raw.dev_attr.attr,
&lm3533_als_attr_out_current1_current1_raw.dev_attr.attr,
&lm3533_als_attr_out_current1_current2_raw.dev_attr.attr,
&lm3533_als_attr_out_current1_current3_raw.dev_attr.attr,
&lm3533_als_attr_out_current1_current4_raw.dev_attr.attr,
&lm3533_als_attr_out_current2_current0_raw.dev_attr.attr,
&lm3533_als_attr_out_current2_current1_raw.dev_attr.attr,
&lm3533_als_attr_out_current2_current2_raw.dev_attr.attr,
&lm3533_als_attr_out_current2_current3_raw.dev_attr.attr,
&lm3533_als_attr_out_current2_current4_raw.dev_attr.attr,
NULL
};
static struct attribute_group lm3533_als_attribute_group = {
.attrs = lm3533_als_attributes
};
static int __devinit lm3533_als_set_input_mode(struct lm3533_als *als,
bool pwm_mode)
{
u8 mask = LM3533_ALS_INPUT_MODE_MASK;
u8 val;
int ret;
if (pwm_mode)
val = mask; /* pwm input */
else
val = 0; /* analog input */
ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, val, mask);
if (ret) {
dev_err(&als->pdev->dev, "failed to set input mode %d\n",
pwm_mode);
return ret;
}
return 0;
}
static int __devinit lm3533_als_set_resistor(struct lm3533_als *als, u8 val)
{
int ret;
if (val < LM3533_ALS_RESISTOR_MIN || val > LM3533_ALS_RESISTOR_MAX)
return -EINVAL;
ret = lm3533_write(als->lm3533, LM3533_REG_ALS_RESISTOR_SELECT, val);
if (ret) {
dev_err(&als->pdev->dev, "failed to set resistor\n");
return ret;
}
return 0;
}
static int __devinit lm3533_als_setup(struct lm3533_als *als,
struct lm3533_als_platform_data *pdata)
{
int ret;
ret = lm3533_als_set_input_mode(als, pdata->pwm_mode);
if (ret)
return ret;
/* ALS input is always high impedance in PWM-mode. */
if (!pdata->pwm_mode) {
ret = lm3533_als_set_resistor(als, pdata->r_select);
if (ret)
return ret;
}
return 0;
}
static int __devinit lm3533_als_setup_irq(struct lm3533_als *als, void *dev)
{
u8 mask = LM3533_ALS_INT_ENABLE_MASK;
int ret;
/* Make sure interrupts are disabled. */
ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, 0, mask);
if (ret) {
dev_err(&als->pdev->dev, "failed to disable interrupts\n");
return ret;
}
ret = request_threaded_irq(als->irq, NULL, lm3533_als_isr,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
dev_name(&als->pdev->dev), dev);
if (ret) {
dev_err(&als->pdev->dev, "failed to request irq %d\n",
als->irq);
return ret;
}
return 0;
}
static int __devinit lm3533_als_enable(struct lm3533_als *als)
{
u8 mask = LM3533_ALS_ENABLE_MASK;
int ret;
ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, mask, mask);
if (ret)
dev_err(&als->pdev->dev, "failed to enable ALS\n");
return ret;
}
static int lm3533_als_disable(struct lm3533_als *als)
{
u8 mask = LM3533_ALS_ENABLE_MASK;
int ret;
ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, 0, mask);
if (ret)
dev_err(&als->pdev->dev, "failed to disable ALS\n");
return ret;
}
static const struct iio_info lm3533_als_info = {
.attrs = &lm3533_als_attribute_group,
.event_attrs = &lm3533_als_event_attribute_group,
.driver_module = THIS_MODULE,
.read_raw = &lm3533_als_read_raw,
};
static int __devinit lm3533_als_probe(struct platform_device *pdev)
{
struct lm3533 *lm3533;
struct lm3533_als_platform_data *pdata;
struct lm3533_als *als;
struct iio_dev *indio_dev;
int ret;
lm3533 = dev_get_drvdata(pdev->dev.parent);
if (!lm3533)
return -EINVAL;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
}
indio_dev = iio_device_alloc(sizeof(*als));
if (!indio_dev)
return -ENOMEM;
indio_dev->info = &lm3533_als_info;
indio_dev->channels = lm3533_als_channels;
indio_dev->num_channels = ARRAY_SIZE(lm3533_als_channels);
indio_dev->name = dev_name(&pdev->dev);
indio_dev->dev.parent = pdev->dev.parent;
indio_dev->modes = INDIO_DIRECT_MODE;
als = iio_priv(indio_dev);
als->lm3533 = lm3533;
als->pdev = pdev;
als->irq = lm3533->irq;
atomic_set(&als->zone, 0);
mutex_init(&als->thresh_mutex);
platform_set_drvdata(pdev, indio_dev);
if (als->irq) {
ret = lm3533_als_setup_irq(als, indio_dev);
if (ret)
goto err_free_dev;
}
ret = lm3533_als_setup(als, pdata);
if (ret)
goto err_free_irq;
ret = lm3533_als_enable(als);
if (ret)
goto err_free_irq;
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&pdev->dev, "failed to register ALS\n");
goto err_disable;
}
return 0;
err_disable:
lm3533_als_disable(als);
err_free_irq:
if (als->irq)
free_irq(als->irq, indio_dev);
err_free_dev:
iio_device_free(indio_dev);
return ret;
}
static int __devexit lm3533_als_remove(struct platform_device *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct lm3533_als *als = iio_priv(indio_dev);
lm3533_als_set_int_mode(indio_dev, false);
iio_device_unregister(indio_dev);
lm3533_als_disable(als);
if (als->irq)
free_irq(als->irq, indio_dev);
iio_device_free(indio_dev);
return 0;
}
static struct platform_driver lm3533_als_driver = {
.driver = {
.name = "lm3533-als",
.owner = THIS_MODULE,
},
.probe = lm3533_als_probe,
.remove = __devexit_p(lm3533_als_remove),
};
module_platform_driver(lm3533_als_driver);
MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
MODULE_DESCRIPTION("LM3533 Ambient Light Sensor driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lm3533-als");