mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
4166b47c2b
The equivalent of both of these are now done via macro magic when the relevant register calls are made. The actual structure elements will shortly go away. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
330 lines
8.0 KiB
C
330 lines
8.0 KiB
C
/*
|
|
* CM3605 Ambient Light and Proximity Sensor
|
|
*
|
|
* Copyright (C) 2016 Linaro Ltd.
|
|
* Author: Linus Walleij <linus.walleij@linaro.org>
|
|
*
|
|
* This hardware was found in the very first Nexus One handset from Google/HTC
|
|
* and an early endavour into mobile light and proximity sensors.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
#include <linux/iio/events.h>
|
|
#include <linux/iio/consumer.h> /* To get our ADC channel */
|
|
#include <linux/iio/types.h> /* To deal with our ADC channel */
|
|
#include <linux/init.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/math64.h>
|
|
#include <linux/pm.h>
|
|
|
|
#define CM3605_PROX_CHANNEL 0
|
|
#define CM3605_ALS_CHANNEL 1
|
|
#define CM3605_AOUT_TYP_MAX_MV 1550
|
|
/* It should not go above 1.650V according to the data sheet */
|
|
#define CM3605_AOUT_MAX_MV 1650
|
|
|
|
/**
|
|
* struct cm3605 - CM3605 state
|
|
* @dev: pointer to parent device
|
|
* @vdd: regulator controlling VDD
|
|
* @aset: sleep enable GPIO, high = sleep
|
|
* @aout: IIO ADC channel to convert the AOUT signal
|
|
* @als_max: maximum LUX detection (depends on RSET)
|
|
* @dir: proximity direction: start as FALLING
|
|
* @led: trigger for the infrared LED used by the proximity sensor
|
|
*/
|
|
struct cm3605 {
|
|
struct device *dev;
|
|
struct regulator *vdd;
|
|
struct gpio_desc *aset;
|
|
struct iio_channel *aout;
|
|
s32 als_max;
|
|
enum iio_event_direction dir;
|
|
struct led_trigger *led;
|
|
};
|
|
|
|
static irqreturn_t cm3605_prox_irq(int irq, void *d)
|
|
{
|
|
struct iio_dev *indio_dev = d;
|
|
struct cm3605 *cm3605 = iio_priv(indio_dev);
|
|
u64 ev;
|
|
|
|
ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, CM3605_PROX_CHANNEL,
|
|
IIO_EV_TYPE_THRESH, cm3605->dir);
|
|
iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev));
|
|
|
|
/* Invert the edge for each event */
|
|
if (cm3605->dir == IIO_EV_DIR_RISING)
|
|
cm3605->dir = IIO_EV_DIR_FALLING;
|
|
else
|
|
cm3605->dir = IIO_EV_DIR_RISING;
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int cm3605_get_lux(struct cm3605 *cm3605)
|
|
{
|
|
int ret, res;
|
|
s64 lux;
|
|
|
|
ret = iio_read_channel_processed(cm3605->aout, &res);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dev_dbg(cm3605->dev, "read %d mV from ADC\n", res);
|
|
|
|
/*
|
|
* AOUT has an offset of ~30mV then linear at dark
|
|
* then goes from 2.54 up to 650 LUX yielding 1.55V
|
|
* (1550 mV) so scale the returned value to this interval
|
|
* using simple linear interpolation.
|
|
*/
|
|
if (res < 30)
|
|
return 0;
|
|
if (res > CM3605_AOUT_MAX_MV)
|
|
dev_err(cm3605->dev, "device out of range\n");
|
|
|
|
/* Remove bias */
|
|
lux = res - 30;
|
|
|
|
/* Linear interpolation between 0 and ALS typ max */
|
|
lux *= cm3605->als_max;
|
|
lux = div64_s64(lux, CM3605_AOUT_TYP_MAX_MV);
|
|
|
|
return lux;
|
|
}
|
|
|
|
static int cm3605_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct cm3605 *cm3605 = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
switch (chan->type) {
|
|
case IIO_LIGHT:
|
|
ret = cm3605_get_lux(cm3605);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = ret;
|
|
return IIO_VAL_INT;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct iio_info cm3605_info = {
|
|
.read_raw = cm3605_read_raw,
|
|
};
|
|
|
|
static const struct iio_event_spec cm3605_events[] = {
|
|
{
|
|
.type = IIO_EV_TYPE_THRESH,
|
|
.dir = IIO_EV_DIR_EITHER,
|
|
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
|
|
},
|
|
};
|
|
|
|
static const struct iio_chan_spec cm3605_channels[] = {
|
|
{
|
|
.type = IIO_PROXIMITY,
|
|
.event_spec = cm3605_events,
|
|
.num_event_specs = ARRAY_SIZE(cm3605_events),
|
|
},
|
|
{
|
|
.type = IIO_LIGHT,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
|
.channel = CM3605_ALS_CHANNEL,
|
|
},
|
|
};
|
|
|
|
static int cm3605_probe(struct platform_device *pdev)
|
|
{
|
|
struct cm3605 *cm3605;
|
|
struct iio_dev *indio_dev;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = dev->of_node;
|
|
enum iio_chan_type ch_type;
|
|
u32 rset;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*cm3605));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
platform_set_drvdata(pdev, indio_dev);
|
|
|
|
cm3605 = iio_priv(indio_dev);
|
|
cm3605->dev = dev;
|
|
cm3605->dir = IIO_EV_DIR_FALLING;
|
|
|
|
ret = of_property_read_u32(np, "capella,aset-resistance-ohms", &rset);
|
|
if (ret) {
|
|
dev_info(dev, "no RSET specified, assuming 100K\n");
|
|
rset = 100000;
|
|
}
|
|
switch (rset) {
|
|
case 50000:
|
|
cm3605->als_max = 650;
|
|
break;
|
|
case 100000:
|
|
cm3605->als_max = 300;
|
|
break;
|
|
case 300000:
|
|
cm3605->als_max = 100;
|
|
break;
|
|
case 600000:
|
|
cm3605->als_max = 50;
|
|
break;
|
|
default:
|
|
dev_info(dev, "non-standard resistance\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
cm3605->aout = devm_iio_channel_get(dev, "aout");
|
|
if (IS_ERR(cm3605->aout)) {
|
|
if (PTR_ERR(cm3605->aout) == -ENODEV) {
|
|
dev_err(dev, "no ADC, deferring...\n");
|
|
return -EPROBE_DEFER;
|
|
}
|
|
dev_err(dev, "failed to get AOUT ADC channel\n");
|
|
return PTR_ERR(cm3605->aout);
|
|
}
|
|
ret = iio_get_channel_type(cm3605->aout, &ch_type);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ch_type != IIO_VOLTAGE) {
|
|
dev_err(dev, "wrong type of IIO channel specified for AOUT\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
cm3605->vdd = devm_regulator_get(dev, "vdd");
|
|
if (IS_ERR(cm3605->vdd)) {
|
|
dev_err(dev, "failed to get VDD regulator\n");
|
|
return PTR_ERR(cm3605->vdd);
|
|
}
|
|
ret = regulator_enable(cm3605->vdd);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable VDD regulator\n");
|
|
return ret;
|
|
}
|
|
|
|
cm3605->aset = devm_gpiod_get(dev, "aset", GPIOD_OUT_HIGH);
|
|
if (IS_ERR(cm3605->aset)) {
|
|
dev_err(dev, "no ASET GPIO\n");
|
|
ret = PTR_ERR(cm3605->aset);
|
|
goto out_disable_vdd;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0),
|
|
cm3605_prox_irq, NULL, 0, "cm3605", indio_dev);
|
|
if (ret) {
|
|
dev_err(dev, "unable to request IRQ\n");
|
|
goto out_disable_aset;
|
|
}
|
|
|
|
/* Just name the trigger the same as the driver */
|
|
led_trigger_register_simple("cm3605", &cm3605->led);
|
|
led_trigger_event(cm3605->led, LED_FULL);
|
|
|
|
indio_dev->dev.parent = dev;
|
|
indio_dev->info = &cm3605_info;
|
|
indio_dev->name = "cm3605";
|
|
indio_dev->channels = cm3605_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(cm3605_channels);
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto out_remove_trigger;
|
|
dev_info(dev, "Capella Microsystems CM3605 enabled range 0..%d LUX\n",
|
|
cm3605->als_max);
|
|
|
|
return 0;
|
|
|
|
out_remove_trigger:
|
|
led_trigger_event(cm3605->led, LED_OFF);
|
|
led_trigger_unregister_simple(cm3605->led);
|
|
out_disable_aset:
|
|
gpiod_set_value_cansleep(cm3605->aset, 0);
|
|
out_disable_vdd:
|
|
regulator_disable(cm3605->vdd);
|
|
return ret;
|
|
}
|
|
|
|
static int cm3605_remove(struct platform_device *pdev)
|
|
{
|
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
|
|
struct cm3605 *cm3605 = iio_priv(indio_dev);
|
|
|
|
led_trigger_event(cm3605->led, LED_OFF);
|
|
led_trigger_unregister_simple(cm3605->led);
|
|
gpiod_set_value_cansleep(cm3605->aset, 0);
|
|
iio_device_unregister(indio_dev);
|
|
regulator_disable(cm3605->vdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused cm3605_pm_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct cm3605 *cm3605 = iio_priv(indio_dev);
|
|
|
|
led_trigger_event(cm3605->led, LED_OFF);
|
|
regulator_disable(cm3605->vdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused cm3605_pm_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct cm3605 *cm3605 = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = regulator_enable(cm3605->vdd);
|
|
if (ret)
|
|
dev_err(dev, "failed to enable regulator in resume path\n");
|
|
led_trigger_event(cm3605->led, LED_FULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops cm3605_dev_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(cm3605_pm_suspend,
|
|
cm3605_pm_resume)
|
|
};
|
|
|
|
static const struct of_device_id cm3605_of_match[] = {
|
|
{.compatible = "capella,cm3605"},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, cm3605_of_match);
|
|
|
|
static struct platform_driver cm3605_driver = {
|
|
.driver = {
|
|
.name = "cm3605",
|
|
.of_match_table = cm3605_of_match,
|
|
.pm = &cm3605_dev_pm_ops,
|
|
},
|
|
.probe = cm3605_probe,
|
|
.remove = cm3605_remove,
|
|
};
|
|
module_platform_driver(cm3605_driver);
|
|
|
|
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
|
|
MODULE_DESCRIPTION("CM3605 ambient light and proximity sensor driver");
|
|
MODULE_LICENSE("GPL");
|