forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
356 lines
8.2 KiB
356 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* STMicroelectronics uvis25 sensor driver |
|
* |
|
* Copyright 2017 STMicroelectronics Inc. |
|
* |
|
* Lorenzo Bianconi <[email protected]> |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/device.h> |
|
#include <linux/iio/sysfs.h> |
|
#include <linux/delay.h> |
|
#include <linux/pm.h> |
|
#include <linux/interrupt.h> |
|
#include <linux/irqreturn.h> |
|
#include <linux/iio/trigger.h> |
|
#include <linux/iio/trigger_consumer.h> |
|
#include <linux/iio/triggered_buffer.h> |
|
#include <linux/iio/buffer.h> |
|
#include <linux/regmap.h> |
|
|
|
#include "st_uvis25.h" |
|
|
|
#define ST_UVIS25_REG_WHOAMI_ADDR 0x0f |
|
#define ST_UVIS25_REG_WHOAMI_VAL 0xca |
|
#define ST_UVIS25_REG_CTRL1_ADDR 0x20 |
|
#define ST_UVIS25_REG_ODR_MASK BIT(0) |
|
#define ST_UVIS25_REG_BDU_MASK BIT(1) |
|
#define ST_UVIS25_REG_CTRL2_ADDR 0x21 |
|
#define ST_UVIS25_REG_BOOT_MASK BIT(7) |
|
#define ST_UVIS25_REG_CTRL3_ADDR 0x22 |
|
#define ST_UVIS25_REG_HL_MASK BIT(7) |
|
#define ST_UVIS25_REG_STATUS_ADDR 0x27 |
|
#define ST_UVIS25_REG_UV_DA_MASK BIT(0) |
|
#define ST_UVIS25_REG_OUT_ADDR 0x28 |
|
|
|
static const struct iio_chan_spec st_uvis25_channels[] = { |
|
{ |
|
.type = IIO_UVINDEX, |
|
.address = ST_UVIS25_REG_OUT_ADDR, |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), |
|
.scan_index = 0, |
|
.scan_type = { |
|
.sign = 'u', |
|
.realbits = 8, |
|
.storagebits = 8, |
|
}, |
|
}, |
|
IIO_CHAN_SOFT_TIMESTAMP(1), |
|
}; |
|
|
|
static int st_uvis25_check_whoami(struct st_uvis25_hw *hw) |
|
{ |
|
int err, data; |
|
|
|
err = regmap_read(hw->regmap, ST_UVIS25_REG_WHOAMI_ADDR, &data); |
|
if (err < 0) { |
|
dev_err(regmap_get_device(hw->regmap), |
|
"failed to read whoami register\n"); |
|
return err; |
|
} |
|
|
|
if (data != ST_UVIS25_REG_WHOAMI_VAL) { |
|
dev_err(regmap_get_device(hw->regmap), |
|
"wrong whoami {%02x vs %02x}\n", |
|
data, ST_UVIS25_REG_WHOAMI_VAL); |
|
return -ENODEV; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int st_uvis25_set_enable(struct st_uvis25_hw *hw, bool enable) |
|
{ |
|
int err; |
|
|
|
err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR, |
|
ST_UVIS25_REG_ODR_MASK, enable); |
|
if (err < 0) |
|
return err; |
|
|
|
hw->enabled = enable; |
|
|
|
return 0; |
|
} |
|
|
|
static int st_uvis25_read_oneshot(struct st_uvis25_hw *hw, u8 addr, int *val) |
|
{ |
|
int err; |
|
|
|
err = st_uvis25_set_enable(hw, true); |
|
if (err < 0) |
|
return err; |
|
|
|
msleep(1500); |
|
|
|
/* |
|
* in order to avoid possible race conditions with interrupt |
|
* generation, disable the sensor first and then poll output |
|
* register. That sequence guarantees the interrupt will be reset |
|
* when irq line is unmasked |
|
*/ |
|
err = st_uvis25_set_enable(hw, false); |
|
if (err < 0) |
|
return err; |
|
|
|
err = regmap_read(hw->regmap, addr, val); |
|
|
|
return err < 0 ? err : IIO_VAL_INT; |
|
} |
|
|
|
static int st_uvis25_read_raw(struct iio_dev *iio_dev, |
|
struct iio_chan_spec const *ch, |
|
int *val, int *val2, long mask) |
|
{ |
|
int ret; |
|
|
|
ret = iio_device_claim_direct_mode(iio_dev); |
|
if (ret) |
|
return ret; |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_PROCESSED: { |
|
struct st_uvis25_hw *hw = iio_priv(iio_dev); |
|
|
|
/* |
|
* mask irq line during oneshot read since the sensor |
|
* does not export the capability to disable data-ready line |
|
* in the register map and it is enabled by default. |
|
* If the line is unmasked during read_raw() it will be set |
|
* active and never reset since the trigger is disabled |
|
*/ |
|
if (hw->irq > 0) |
|
disable_irq(hw->irq); |
|
ret = st_uvis25_read_oneshot(hw, ch->address, val); |
|
if (hw->irq > 0) |
|
enable_irq(hw->irq); |
|
break; |
|
} |
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
iio_device_release_direct_mode(iio_dev); |
|
|
|
return ret; |
|
} |
|
|
|
static irqreturn_t st_uvis25_trigger_handler_thread(int irq, void *private) |
|
{ |
|
struct st_uvis25_hw *hw = private; |
|
int err, status; |
|
|
|
err = regmap_read(hw->regmap, ST_UVIS25_REG_STATUS_ADDR, &status); |
|
if (err < 0) |
|
return IRQ_HANDLED; |
|
|
|
if (!(status & ST_UVIS25_REG_UV_DA_MASK)) |
|
return IRQ_NONE; |
|
|
|
iio_trigger_poll_chained(hw->trig); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int st_uvis25_allocate_trigger(struct iio_dev *iio_dev) |
|
{ |
|
struct st_uvis25_hw *hw = iio_priv(iio_dev); |
|
struct device *dev = regmap_get_device(hw->regmap); |
|
bool irq_active_low = false; |
|
unsigned long irq_type; |
|
int err; |
|
|
|
irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq)); |
|
|
|
switch (irq_type) { |
|
case IRQF_TRIGGER_HIGH: |
|
case IRQF_TRIGGER_RISING: |
|
break; |
|
case IRQF_TRIGGER_LOW: |
|
case IRQF_TRIGGER_FALLING: |
|
irq_active_low = true; |
|
break; |
|
default: |
|
dev_info(dev, "mode %lx unsupported\n", irq_type); |
|
return -EINVAL; |
|
} |
|
|
|
err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL3_ADDR, |
|
ST_UVIS25_REG_HL_MASK, irq_active_low); |
|
if (err < 0) |
|
return err; |
|
|
|
err = devm_request_threaded_irq(dev, hw->irq, NULL, |
|
st_uvis25_trigger_handler_thread, |
|
irq_type | IRQF_ONESHOT, |
|
iio_dev->name, hw); |
|
if (err) { |
|
dev_err(dev, "failed to request trigger irq %d\n", |
|
hw->irq); |
|
return err; |
|
} |
|
|
|
hw->trig = devm_iio_trigger_alloc(dev, "%s-trigger", |
|
iio_dev->name); |
|
if (!hw->trig) |
|
return -ENOMEM; |
|
|
|
iio_trigger_set_drvdata(hw->trig, iio_dev); |
|
|
|
return devm_iio_trigger_register(dev, hw->trig); |
|
} |
|
|
|
static int st_uvis25_buffer_preenable(struct iio_dev *iio_dev) |
|
{ |
|
return st_uvis25_set_enable(iio_priv(iio_dev), true); |
|
} |
|
|
|
static int st_uvis25_buffer_postdisable(struct iio_dev *iio_dev) |
|
{ |
|
return st_uvis25_set_enable(iio_priv(iio_dev), false); |
|
} |
|
|
|
static const struct iio_buffer_setup_ops st_uvis25_buffer_ops = { |
|
.preenable = st_uvis25_buffer_preenable, |
|
.postdisable = st_uvis25_buffer_postdisable, |
|
}; |
|
|
|
static irqreturn_t st_uvis25_buffer_handler_thread(int irq, void *p) |
|
{ |
|
struct iio_poll_func *pf = p; |
|
struct iio_dev *iio_dev = pf->indio_dev; |
|
struct st_uvis25_hw *hw = iio_priv(iio_dev); |
|
unsigned int val; |
|
int err; |
|
|
|
err = regmap_read(hw->regmap, ST_UVIS25_REG_OUT_ADDR, &val); |
|
if (err < 0) |
|
goto out; |
|
|
|
hw->scan.chan = val; |
|
|
|
iio_push_to_buffers_with_timestamp(iio_dev, &hw->scan, |
|
iio_get_time_ns(iio_dev)); |
|
|
|
out: |
|
iio_trigger_notify_done(hw->trig); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int st_uvis25_allocate_buffer(struct iio_dev *iio_dev) |
|
{ |
|
struct st_uvis25_hw *hw = iio_priv(iio_dev); |
|
|
|
return devm_iio_triggered_buffer_setup(regmap_get_device(hw->regmap), |
|
iio_dev, NULL, |
|
st_uvis25_buffer_handler_thread, |
|
&st_uvis25_buffer_ops); |
|
} |
|
|
|
static const struct iio_info st_uvis25_info = { |
|
.read_raw = st_uvis25_read_raw, |
|
}; |
|
|
|
static int st_uvis25_init_sensor(struct st_uvis25_hw *hw) |
|
{ |
|
int err; |
|
|
|
err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL2_ADDR, |
|
ST_UVIS25_REG_BOOT_MASK, 1); |
|
if (err < 0) |
|
return err; |
|
|
|
msleep(2000); |
|
|
|
return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR, |
|
ST_UVIS25_REG_BDU_MASK, 1); |
|
} |
|
|
|
int st_uvis25_probe(struct device *dev, int irq, struct regmap *regmap) |
|
{ |
|
struct st_uvis25_hw *hw; |
|
struct iio_dev *iio_dev; |
|
int err; |
|
|
|
iio_dev = devm_iio_device_alloc(dev, sizeof(*hw)); |
|
if (!iio_dev) |
|
return -ENOMEM; |
|
|
|
dev_set_drvdata(dev, (void *)iio_dev); |
|
|
|
hw = iio_priv(iio_dev); |
|
hw->irq = irq; |
|
hw->regmap = regmap; |
|
|
|
err = st_uvis25_check_whoami(hw); |
|
if (err < 0) |
|
return err; |
|
|
|
iio_dev->modes = INDIO_DIRECT_MODE; |
|
iio_dev->channels = st_uvis25_channels; |
|
iio_dev->num_channels = ARRAY_SIZE(st_uvis25_channels); |
|
iio_dev->name = ST_UVIS25_DEV_NAME; |
|
iio_dev->info = &st_uvis25_info; |
|
|
|
err = st_uvis25_init_sensor(hw); |
|
if (err < 0) |
|
return err; |
|
|
|
if (hw->irq > 0) { |
|
err = st_uvis25_allocate_buffer(iio_dev); |
|
if (err < 0) |
|
return err; |
|
|
|
err = st_uvis25_allocate_trigger(iio_dev); |
|
if (err) |
|
return err; |
|
} |
|
|
|
return devm_iio_device_register(dev, iio_dev); |
|
} |
|
EXPORT_SYMBOL(st_uvis25_probe); |
|
|
|
static int __maybe_unused st_uvis25_suspend(struct device *dev) |
|
{ |
|
struct iio_dev *iio_dev = dev_get_drvdata(dev); |
|
struct st_uvis25_hw *hw = iio_priv(iio_dev); |
|
|
|
return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR, |
|
ST_UVIS25_REG_ODR_MASK, 0); |
|
} |
|
|
|
static int __maybe_unused st_uvis25_resume(struct device *dev) |
|
{ |
|
struct iio_dev *iio_dev = dev_get_drvdata(dev); |
|
struct st_uvis25_hw *hw = iio_priv(iio_dev); |
|
|
|
if (hw->enabled) |
|
return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR, |
|
ST_UVIS25_REG_ODR_MASK, 1); |
|
|
|
return 0; |
|
} |
|
|
|
const struct dev_pm_ops st_uvis25_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(st_uvis25_suspend, st_uvis25_resume) |
|
}; |
|
EXPORT_SYMBOL(st_uvis25_pm_ops); |
|
|
|
MODULE_AUTHOR("Lorenzo Bianconi <[email protected]>"); |
|
MODULE_DESCRIPTION("STMicroelectronics uvis25 sensor driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|