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Subject[PATCH v4] iio: add LM3533 ambient-light-sensor driver
Date
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 brightness target levels.

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.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
---
Note that addition of r_select to the platform data probably needs to go
in via mfd.


v2:
- reimplement using iio
- add sysfs-ABI documentation
v3
- use indexed channel
- fix sysfs-ABI documentation typo and style
- replace gain attribute with in_illuminance0_calibscale
- add calibscale to platform data
- fix adc register definitions
- replace to_lm3533_dev_attr macro with inline function
- fix device used for error reporting at irq allocation
- use iio device for error reporting during setup/enable
- rebase on staging-next
- fix header include paths
- use dev_to_iio_dev
- add IIO_CHAN_INFO_RAW to info mask
- use iio_device_{alloc,free}
v4
- move to driver/iio/light
- add events/in_illuminance0_threshY_hysteresis attributes
- fix device zone-boundary quirkiness
- clean up attribute handling
- replace calibscale with device-specific r_select attribute

.../ABI/testing/sysfs-bus-iio-light-lm3533-als | 64 ++
drivers/iio/Kconfig | 1 +
drivers/iio/Makefile | 1 +
drivers/iio/light/Kconfig | 22 +
drivers/iio/light/Makefile | 5 +
drivers/iio/light/lm3533-als.c | 941 ++++++++++++++++++++
include/linux/mfd/lm3533.h | 1 +
7 files changed, 1035 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-light-lm3533-als
create mode 100644 drivers/iio/light/Kconfig
create mode 100644 drivers/iio/light/Makefile
create mode 100644 drivers/iio/light/lm3533-als.c
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-light-lm3533-als b/Documentation/ABI/testing/sysfs-bus-iio-light-lm3533-als
new file mode 100644
index 0000000..7ea1770
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-light-lm3533-als
@@ -0,0 +1,64 @@
+What: /sys/bus/iio/devices/iio:deviceX/r_select
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@gmail.com>
+Description:
+ Set the ALS internal pull-down resistor for analog input mode
+ (1..127), such that,
+
+ R_als = 200000 / r_select (ohm)
+
+ This setting is ignored in PWM-mode (input is always high
+ impedance in PWM-mode).
+
+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, 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/targetY_Z
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@gmail.com>
+Description:
+ Set the target brightness for ALS-mapper Y in light zone Z
+ (0..255), where Y in 1..3 and Z in 0..4.
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index 56eecef..cacc74d 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -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
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index e425afd..060b674 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o

obj-y += adc/
obj-y += amplifiers/
+obj-y += light/
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
new file mode 100644
index 0000000..7738a58
--- /dev/null
+++ b/drivers/iio/light/Kconfig
@@ -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 brightness target levels.
+
+ 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.
+
+endmenu
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
new file mode 100644
index 0000000..c1c23a0
--- /dev/null
+++ b/drivers/iio/light/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for IIO Light sensors
+#
+
+obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
diff --git a/drivers/iio/light/lm3533-als.c b/drivers/iio/light/lm3533-als.c
new file mode 100644
index 0000000..5944ac1
--- /dev/null
+++ b/drivers/iio/light/lm3533-als.c
@@ -0,0 +1,941 @@
+/*
+ * 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_MAPPER_MIN 1
+#define LM3533_ALS_MAPPER_MAX 3
+#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;
+
+ unsigned long flags;
+ int irq;
+
+ int pwm_mode:1;
+
+ 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_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:
+ ret = lm3533_als_get_adc(indio_dev, false, val);
+ 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;
+}
+
+static const struct iio_chan_spec lm3533_als_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .channel = 0,
+ .indexed = 1,
+ .info_mask = (IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT |
+ IIO_CHAN_INFO_RAW_SEPARATE_BIT),
+ }
+};
+
+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 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 int lm3533_als_get_resistor(struct iio_dev *indio_dev, u8 *val)
+{
+ struct lm3533_als *als = iio_priv(indio_dev);
+ int ret;
+
+ if (als->pwm_mode) {
+ *val = 0; /* always high impedance */
+ return 0;
+ }
+
+ ret = lm3533_read(als->lm3533, LM3533_REG_ALS_RESISTOR_SELECT, val);
+ if (ret) {
+ dev_err(&indio_dev->dev, "failed to get resistor\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int lm3533_als_set_resistor(struct iio_dev *indio_dev, u8 val)
+{
+ struct lm3533_als *als = iio_priv(indio_dev);
+ int ret;
+
+ if (als->pwm_mode)
+ return -EPERM; /* always high impedance */
+
+ 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(&indio_dev->dev, "failed to set resistor\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * nr -- als mapper 1..3
+ * zone -- als zone 0..4
+ */
+static inline u8 lm3533_als_get_target_reg(unsigned nr, unsigned zone)
+{
+ return LM3533_REG_ALS_TARGET_BASE + 5 * (nr - 1) + zone;
+}
+
+static int lm3533_als_get_target(struct iio_dev *indio_dev, unsigned nr,
+ unsigned zone, u8 *val)
+{
+ struct lm3533_als *als = iio_priv(indio_dev);
+ u8 reg;
+ int ret;
+
+ if (nr < LM3533_ALS_MAPPER_MIN || nr > LM3533_ALS_MAPPER_MAX)
+ return -EINVAL;
+
+ if (zone > LM3533_ALS_ZONE_MAX)
+ return -EINVAL;
+
+ reg = lm3533_als_get_target_reg(nr, zone);
+ ret = lm3533_read(als->lm3533, reg, val);
+ if (ret)
+ dev_err(&indio_dev->dev, "failed to get target brightness\n");
+
+ return ret;
+}
+
+static int lm3533_als_set_target(struct iio_dev *indio_dev, unsigned nr,
+ unsigned zone, u8 val)
+{
+ struct lm3533_als *als = iio_priv(indio_dev);
+ u8 reg;
+ int ret;
+
+ if (nr < LM3533_ALS_MAPPER_MIN || nr > LM3533_ALS_MAPPER_MAX)
+ return -EINVAL;
+
+ if (zone > LM3533_ALS_ZONE_MAX)
+ return -EINVAL;
+
+ reg = lm3533_als_get_target_reg(nr, zone);
+ ret = lm3533_write(als->lm3533, reg, val);
+ if (ret)
+ dev_err(&indio_dev->dev, "failed to set target brightness\n");
+
+ return ret;
+}
+
+static inline u8 lm3533_als_get_threshold_reg(unsigned nr, bool raising)
+{
+ u8 offset;
+
+ if (raising)
+ offset = 0;
+ else
+ offset = 1;
+
+ 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;
+ u8 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);
+ struct lm3533_als *als = iio_priv(indio_dev);
+ u8 zone;
+ 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 scnprintf(buf, PAGE_SIZE, "%u\n", zone);
+}
+
+static ssize_t show_r_select(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ u8 r_select;
+ int ret;
+
+ ret = lm3533_als_get_resistor(indio_dev, &r_select);
+ if (ret)
+ return ret;
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n", r_select);
+}
+
+static int store_r_select(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ unsigned long r_select;
+ int ret;
+
+ if (kstrtoul(buf, 0, &r_select))
+ return -EINVAL;
+
+ ret = lm3533_als_set_resistor(indio_dev, r_select);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+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:
+ WARN(1, "%s - bad attribute type %d\n", __func__,
+ als_attr->type);
+ 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:
+ WARN(1, "%s - bad attribute type %d\n", __func__,
+ als_attr->type);
+ 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(_nr, _zone) \
+ LM3533_ALS_ATTR(target##_nr##_##_zone, S_IRUGO | S_IWUSR, \
+ show_als_attr, store_als_attr, \
+ LM3533_ATTR_TYPE_TARGET, _nr, _zone)
+/*
+ * ALS Mapper targets
+ *
+ * target[1-3]_[0-4] 0-255
+ */
+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);
+
+static ALS_TARGET_ATTR_RW(3, 0);
+static ALS_TARGET_ATTR_RW(3, 1);
+static ALS_TARGET_ATTR_RW(3, 2);
+static ALS_TARGET_ATTR_RW(3, 3);
+static ALS_TARGET_ATTR_RW(3, 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);
+
+/*
+ * ALS internal pull-down resistor select (analog mode)
+ *
+ * r_select 1-127
+ *
+ * R_als = 200000 / r_select (ohm)
+ */
+static LM3533_ATTR_RW(r_select);
+
+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_r_select.attr,
+ &lm3533_als_attr_target1_0.dev_attr.attr,
+ &lm3533_als_attr_target1_1.dev_attr.attr,
+ &lm3533_als_attr_target1_2.dev_attr.attr,
+ &lm3533_als_attr_target1_3.dev_attr.attr,
+ &lm3533_als_attr_target1_4.dev_attr.attr,
+ &lm3533_als_attr_target2_0.dev_attr.attr,
+ &lm3533_als_attr_target2_1.dev_attr.attr,
+ &lm3533_als_attr_target2_2.dev_attr.attr,
+ &lm3533_als_attr_target2_3.dev_attr.attr,
+ &lm3533_als_attr_target2_4.dev_attr.attr,
+ &lm3533_als_attr_target3_0.dev_attr.attr,
+ &lm3533_als_attr_target3_1.dev_attr.attr,
+ &lm3533_als_attr_target3_2.dev_attr.attr,
+ &lm3533_als_attr_target3_3.dev_attr.attr,
+ &lm3533_als_attr_target3_4.dev_attr.attr,
+ &dev_attr_in_illuminance0_zone.attr,
+ NULL
+};
+
+static struct attribute_group lm3533_als_attribute_group = {
+ .attrs = lm3533_als_attributes
+};
+
+static int __devinit lm3533_als_set_input_mode(struct iio_dev *indio_dev,
+ int pwm_mode)
+{
+ struct lm3533_als *als = iio_priv(indio_dev);
+ 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, mask, mask);
+ if (ret) {
+ dev_err(&indio_dev->dev,
+ "failed to set input mode %d\n", pwm_mode);
+ }
+
+ return ret;
+}
+
+static int __devinit lm3533_als_setup(struct iio_dev *indio_dev,
+ struct lm3533_als_platform_data *pdata)
+{
+ int ret;
+
+ ret = lm3533_als_set_input_mode(indio_dev, 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(indio_dev, pdata->r_select);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __devinit lm3533_als_enable(struct iio_dev *indio_dev)
+{
+ struct lm3533_als *als = iio_priv(indio_dev);
+ u8 mask = LM3533_ALS_ENABLE_MASK;
+ int ret;
+
+ ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, mask, mask);
+ if (ret)
+ dev_err(&indio_dev->dev, "failed to enable ALS\n");
+
+ return ret;
+}
+
+static int __devexit lm3533_als_disable(struct iio_dev *indio_dev)
+{
+ struct lm3533_als *als = iio_priv(indio_dev);
+ u8 mask = LM3533_ALS_ENABLE_MASK;
+ int ret;
+
+ ret = lm3533_update(als->lm3533, LM3533_REG_ALS_CONF, 0, mask);
+ if (ret)
+ dev_err(&indio_dev->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;
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ 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 = "lm3533-als";
+ indio_dev->dev.parent = pdev->dev.parent;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ als = iio_priv(indio_dev);
+ als->lm3533 = lm3533;
+ als->irq = lm3533->irq;
+ als->pwm_mode = pdata->pwm_mode;
+ atomic_set(&als->zone, 0);
+ mutex_init(&als->thresh_mutex);
+
+ if (als->irq) {
+ ret = request_threaded_irq(als->irq, NULL, lm3533_als_isr,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ indio_dev->name, indio_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request irq %d\n",
+ als->irq);
+ goto err_free_dev;
+ }
+ }
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register ALS\n");
+ goto err_free_irq;
+ }
+
+ ret = lm3533_als_setup(indio_dev, pdata);
+ if (ret)
+ goto err_unregister;
+
+ ret = lm3533_als_enable(indio_dev);
+ if (ret)
+ goto err_unregister;
+
+ return 0;
+
+err_unregister:
+ iio_device_unregister(indio_dev);
+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);
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ lm3533_als_disable(indio_dev);
+ iio_device_unregister(indio_dev);
+ 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");
diff --git a/include/linux/mfd/lm3533.h b/include/linux/mfd/lm3533.h
index 9660feb..594bc59 100644
--- a/include/linux/mfd/lm3533.h
+++ b/include/linux/mfd/lm3533.h
@@ -43,6 +43,7 @@ struct lm3533_ctrlbank {

struct lm3533_als_platform_data {
unsigned pwm_mode:1; /* PWM input mode (default analog) */
+ u8 r_select; /* 1 - 127 (ignored in PWM-mode) */
};

struct lm3533_bl_platform_data {
--
1.7.8.5


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