930 lines
22 KiB
C
Executable File
930 lines
22 KiB
C
Executable File
/*
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* lm3533-als.c -- LM3533 Ambient Light Sensor driver
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*
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* Copyright (C) 2011-2012 Texas Instruments
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*
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* Author: Johan Hovold <jhovold@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/atomic.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/iio/events.h>
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#include <linux/iio/iio.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/mfd/core.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/mfd/lm3533.h>
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#define LM3533_ALS_RESISTOR_MIN 1
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#define LM3533_ALS_RESISTOR_MAX 127
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#define LM3533_ALS_CHANNEL_CURRENT_MAX 2
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#define LM3533_ALS_THRESH_MAX 3
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#define LM3533_ALS_ZONE_MAX 4
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#define LM3533_REG_ALS_RESISTOR_SELECT 0x30
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#define LM3533_REG_ALS_CONF 0x31
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#define LM3533_REG_ALS_ZONE_INFO 0x34
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#define LM3533_REG_ALS_READ_ADC_RAW 0x37
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#define LM3533_REG_ALS_READ_ADC_AVERAGE 0x38
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#define LM3533_REG_ALS_BOUNDARY_BASE 0x50
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#define LM3533_REG_ALS_TARGET_BASE 0x60
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#define LM3533_ALS_ENABLE_MASK 0x01
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#define LM3533_ALS_INPUT_MODE_MASK 0x02
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#define LM3533_ALS_INT_ENABLE_MASK 0x01
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#define LM3533_ALS_ZONE_SHIFT 2
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#define LM3533_ALS_ZONE_MASK 0x1c
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#define LM3533_ALS_FLAG_INT_ENABLED 1
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struct lm3533_als {
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struct lm3533 *lm3533;
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struct platform_device *pdev;
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unsigned long flags;
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int irq;
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atomic_t zone;
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struct mutex thresh_mutex;
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};
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static int lm3533_als_get_adc(struct iio_dev *indio_dev, bool average,
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int *adc)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 reg;
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u8 val;
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int ret;
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if (average)
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reg = LM3533_REG_ALS_READ_ADC_AVERAGE;
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else
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reg = LM3533_REG_ALS_READ_ADC_RAW;
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ret = lm3533_read(als->lm3533, reg, &val);
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if (ret) {
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dev_err(&indio_dev->dev, "failed to read adc\n");
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return ret;
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}
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*adc = val;
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return 0;
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}
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static int _lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 val;
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int ret;
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ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val);
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if (ret) {
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dev_err(&indio_dev->dev, "failed to read zone\n");
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return ret;
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}
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val = (val & LM3533_ALS_ZONE_MASK) >> LM3533_ALS_ZONE_SHIFT;
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*zone = min_t(u8, val, LM3533_ALS_ZONE_MAX);
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return 0;
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}
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static int lm3533_als_get_zone(struct iio_dev *indio_dev, u8 *zone)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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int ret;
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if (test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags)) {
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*zone = atomic_read(&als->zone);
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} else {
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ret = _lm3533_als_get_zone(indio_dev, zone);
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if (ret)
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return ret;
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}
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return 0;
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}
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/*
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* channel output channel 0..2
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* zone zone 0..4
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*/
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static inline u8 lm3533_als_get_target_reg(unsigned channel, unsigned zone)
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{
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return LM3533_REG_ALS_TARGET_BASE + 5 * channel + zone;
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}
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static int lm3533_als_get_target(struct iio_dev *indio_dev, unsigned channel,
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unsigned zone, u8 *val)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 reg;
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int ret;
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if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX)
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return -EINVAL;
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if (zone > LM3533_ALS_ZONE_MAX)
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return -EINVAL;
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reg = lm3533_als_get_target_reg(channel, zone);
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ret = lm3533_read(als->lm3533, reg, val);
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if (ret)
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dev_err(&indio_dev->dev, "failed to get target current\n");
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return ret;
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}
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static int lm3533_als_set_target(struct iio_dev *indio_dev, unsigned channel,
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unsigned zone, u8 val)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 reg;
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int ret;
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if (channel > LM3533_ALS_CHANNEL_CURRENT_MAX)
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return -EINVAL;
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if (zone > LM3533_ALS_ZONE_MAX)
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return -EINVAL;
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reg = lm3533_als_get_target_reg(channel, zone);
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ret = lm3533_write(als->lm3533, reg, val);
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if (ret)
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dev_err(&indio_dev->dev, "failed to set target current\n");
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return ret;
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}
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static int lm3533_als_get_current(struct iio_dev *indio_dev, unsigned channel,
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int *val)
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{
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u8 zone;
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u8 target;
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int ret;
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ret = lm3533_als_get_zone(indio_dev, &zone);
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if (ret)
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return ret;
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ret = lm3533_als_get_target(indio_dev, channel, zone, &target);
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if (ret)
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return ret;
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*val = target;
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return 0;
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}
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static int lm3533_als_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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int ret;
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switch (mask) {
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case 0:
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switch (chan->type) {
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case IIO_LIGHT:
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ret = lm3533_als_get_adc(indio_dev, false, val);
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break;
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case IIO_CURRENT:
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ret = lm3533_als_get_current(indio_dev, chan->channel,
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val);
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break;
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default:
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return -EINVAL;
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}
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break;
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case IIO_CHAN_INFO_AVERAGE_RAW:
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ret = lm3533_als_get_adc(indio_dev, true, val);
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break;
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default:
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return -EINVAL;
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}
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if (ret)
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return ret;
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return IIO_VAL_INT;
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}
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#define CHANNEL_CURRENT(_channel) \
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{ \
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.type = IIO_CURRENT, \
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.channel = _channel, \
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.indexed = true, \
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.output = true, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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}
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static const struct iio_chan_spec lm3533_als_channels[] = {
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{
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.type = IIO_LIGHT,
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.channel = 0,
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.indexed = true,
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.info_mask_separate = BIT(IIO_CHAN_INFO_AVERAGE_RAW) |
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BIT(IIO_CHAN_INFO_RAW),
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},
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CHANNEL_CURRENT(0),
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CHANNEL_CURRENT(1),
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CHANNEL_CURRENT(2),
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};
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static irqreturn_t lm3533_als_isr(int irq, void *dev_id)
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{
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struct iio_dev *indio_dev = dev_id;
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 zone;
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int ret;
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/* Clear interrupt by reading the ALS zone register. */
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ret = _lm3533_als_get_zone(indio_dev, &zone);
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if (ret)
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goto out;
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atomic_set(&als->zone, zone);
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iio_push_event(indio_dev,
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IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
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0,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_EITHER),
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iio_get_time_ns(indio_dev));
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out:
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return IRQ_HANDLED;
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}
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static int lm3533_als_set_int_mode(struct iio_dev *indio_dev, int enable)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 mask = LM3533_ALS_INT_ENABLE_MASK;
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u8 val;
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int ret;
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if (enable)
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val = mask;
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else
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val = 0;
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ret = lm3533_update(als->lm3533, LM3533_REG_ALS_ZONE_INFO, val, mask);
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if (ret) {
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dev_err(&indio_dev->dev, "failed to set int mode %d\n",
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enable);
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return ret;
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}
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return 0;
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}
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static int lm3533_als_get_int_mode(struct iio_dev *indio_dev, int *enable)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 mask = LM3533_ALS_INT_ENABLE_MASK;
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u8 val;
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int ret;
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ret = lm3533_read(als->lm3533, LM3533_REG_ALS_ZONE_INFO, &val);
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if (ret) {
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dev_err(&indio_dev->dev, "failed to get int mode\n");
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return ret;
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}
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*enable = !!(val & mask);
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return 0;
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}
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static inline u8 lm3533_als_get_threshold_reg(unsigned nr, bool raising)
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{
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u8 offset = !raising;
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return LM3533_REG_ALS_BOUNDARY_BASE + 2 * nr + offset;
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}
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static int lm3533_als_get_threshold(struct iio_dev *indio_dev, unsigned nr,
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bool raising, u8 *val)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 reg;
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int ret;
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if (nr > LM3533_ALS_THRESH_MAX)
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return -EINVAL;
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reg = lm3533_als_get_threshold_reg(nr, raising);
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ret = lm3533_read(als->lm3533, reg, val);
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if (ret)
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dev_err(&indio_dev->dev, "failed to get threshold\n");
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return ret;
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}
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static int lm3533_als_set_threshold(struct iio_dev *indio_dev, unsigned nr,
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bool raising, u8 val)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 val2;
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u8 reg, reg2;
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int ret;
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if (nr > LM3533_ALS_THRESH_MAX)
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return -EINVAL;
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reg = lm3533_als_get_threshold_reg(nr, raising);
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reg2 = lm3533_als_get_threshold_reg(nr, !raising);
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mutex_lock(&als->thresh_mutex);
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ret = lm3533_read(als->lm3533, reg2, &val2);
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if (ret) {
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dev_err(&indio_dev->dev, "failed to get threshold\n");
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goto out;
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}
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/*
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* This device does not allow negative hysteresis (in fact, it uses
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* whichever value is smaller as the lower bound) so we need to make
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* sure that thresh_falling <= thresh_raising.
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*/
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if ((raising && (val < val2)) || (!raising && (val > val2))) {
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ret = -EINVAL;
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goto out;
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}
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ret = lm3533_write(als->lm3533, reg, val);
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if (ret) {
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dev_err(&indio_dev->dev, "failed to set threshold\n");
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goto out;
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}
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out:
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mutex_unlock(&als->thresh_mutex);
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return ret;
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}
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static int lm3533_als_get_hysteresis(struct iio_dev *indio_dev, unsigned nr,
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u8 *val)
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{
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struct lm3533_als *als = iio_priv(indio_dev);
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u8 falling;
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u8 raising;
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int ret;
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if (nr > LM3533_ALS_THRESH_MAX)
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return -EINVAL;
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mutex_lock(&als->thresh_mutex);
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ret = lm3533_als_get_threshold(indio_dev, nr, false, &falling);
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if (ret)
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goto out;
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ret = lm3533_als_get_threshold(indio_dev, nr, true, &raising);
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if (ret)
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goto out;
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*val = raising - falling;
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out:
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mutex_unlock(&als->thresh_mutex);
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return ret;
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}
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static ssize_t show_thresh_either_en(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct lm3533_als *als = iio_priv(indio_dev);
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int enable;
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int ret;
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if (als->irq) {
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ret = lm3533_als_get_int_mode(indio_dev, &enable);
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if (ret)
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return ret;
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} else {
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enable = 0;
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}
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return scnprintf(buf, PAGE_SIZE, "%u\n", enable);
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}
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static ssize_t store_thresh_either_en(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct lm3533_als *als = iio_priv(indio_dev);
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unsigned long enable;
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bool int_enabled;
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u8 zone;
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int ret;
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if (!als->irq)
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return -EBUSY;
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if (kstrtoul(buf, 0, &enable))
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return -EINVAL;
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int_enabled = test_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
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if (enable && !int_enabled) {
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ret = lm3533_als_get_zone(indio_dev, &zone);
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if (ret)
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return ret;
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atomic_set(&als->zone, zone);
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set_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
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}
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ret = lm3533_als_set_int_mode(indio_dev, enable);
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if (ret) {
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if (!int_enabled)
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clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
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return ret;
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}
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if (!enable)
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clear_bit(LM3533_ALS_FLAG_INT_ENABLED, &als->flags);
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return len;
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}
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static ssize_t show_zone(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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u8 zone;
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int ret;
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ret = lm3533_als_get_zone(indio_dev, &zone);
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if (ret)
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return ret;
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return scnprintf(buf, PAGE_SIZE, "%u\n", zone);
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}
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enum lm3533_als_attribute_type {
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LM3533_ATTR_TYPE_HYSTERESIS,
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LM3533_ATTR_TYPE_TARGET,
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LM3533_ATTR_TYPE_THRESH_FALLING,
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LM3533_ATTR_TYPE_THRESH_RAISING,
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};
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struct lm3533_als_attribute {
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struct device_attribute dev_attr;
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enum lm3533_als_attribute_type type;
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u8 val1;
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u8 val2;
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};
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static inline struct lm3533_als_attribute *
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to_lm3533_als_attr(struct device_attribute *attr)
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{
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return container_of(attr, struct lm3533_als_attribute, dev_attr);
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}
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static ssize_t show_als_attr(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct lm3533_als_attribute *als_attr = to_lm3533_als_attr(attr);
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u8 val;
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int ret;
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switch (als_attr->type) {
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case LM3533_ATTR_TYPE_HYSTERESIS:
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ret = lm3533_als_get_hysteresis(indio_dev, als_attr->val1,
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&val);
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break;
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case LM3533_ATTR_TYPE_TARGET:
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ret = lm3533_als_get_target(indio_dev, als_attr->val1,
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als_attr->val2, &val);
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break;
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case LM3533_ATTR_TYPE_THRESH_FALLING:
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ret = lm3533_als_get_threshold(indio_dev, als_attr->val1,
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false, &val);
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break;
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case LM3533_ATTR_TYPE_THRESH_RAISING:
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ret = lm3533_als_get_threshold(indio_dev, als_attr->val1,
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true, &val);
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break;
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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 const 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 const struct attribute_group lm3533_als_attribute_group = {
|
|
.attrs = lm3533_als_attributes
|
|
};
|
|
|
|
static int 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 lm3533_als_set_resistor(struct lm3533_als *als, u8 val)
|
|
{
|
|
int ret;
|
|
|
|
if (val < LM3533_ALS_RESISTOR_MIN || val > LM3533_ALS_RESISTOR_MAX) {
|
|
dev_err(&als->pdev->dev, "invalid resistor value\n");
|
|
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 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 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 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 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 = devm_iio_device_alloc(&pdev->dev, 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)
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int 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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver lm3533_als_driver = {
|
|
.driver = {
|
|
.name = "lm3533-als",
|
|
},
|
|
.probe = lm3533_als_probe,
|
|
.remove = 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");
|