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OpenCloudOS-Kernel/drivers/iio/light/stk3310.c

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/**
* Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
*
* Copyright (c) 2015, Intel Corporation.
*
* This file is subject to the terms and conditions of version 2 of
* the GNU General Public License. See the file COPYING in the main
* directory of this archive for more details.
*
* IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
*/
#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#define STK3310_REG_STATE 0x00
#define STK3310_REG_PSCTRL 0x01
#define STK3310_REG_ALSCTRL 0x02
#define STK3310_REG_INT 0x04
#define STK3310_REG_THDH_PS 0x06
#define STK3310_REG_THDL_PS 0x08
#define STK3310_REG_FLAG 0x10
#define STK3310_REG_PS_DATA_MSB 0x11
#define STK3310_REG_PS_DATA_LSB 0x12
#define STK3310_REG_ALS_DATA_MSB 0x13
#define STK3310_REG_ALS_DATA_LSB 0x14
#define STK3310_REG_ID 0x3E
#define STK3310_MAX_REG 0x80
#define STK3310_STATE_EN_PS 0x01
#define STK3310_STATE_EN_ALS 0x02
#define STK3310_STATE_STANDBY 0x00
#define STK3310_CHIP_ID_VAL 0x13
#define STK3311_CHIP_ID_VAL 0x1D
#define STK3310_PSINT_EN 0x01
#define STK3310_PS_MAX_VAL 0xFFFF
#define STK3310_DRIVER_NAME "stk3310"
#define STK3310_REGMAP_NAME "stk3310_regmap"
#define STK3310_EVENT "stk3310_event"
#define STK3310_GPIO "stk3310_gpio"
#define STK3310_SCALE_AVAILABLE "6.4 1.6 0.4 0.1"
#define STK3310_IT_AVAILABLE \
"0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
"0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
"3.031040 6.062080"
#define STK3310_REGFIELD(name) \
do { \
data->reg_##name = \
devm_regmap_field_alloc(&client->dev, regmap, \
stk3310_reg_field_##name); \
if (IS_ERR(data->reg_##name)) { \
dev_err(&client->dev, "reg field alloc failed.\n"); \
return PTR_ERR(data->reg_##name); \
} \
} while (0)
static const struct reg_field stk3310_reg_field_state =
REG_FIELD(STK3310_REG_STATE, 0, 2);
static const struct reg_field stk3310_reg_field_als_gain =
REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
static const struct reg_field stk3310_reg_field_ps_gain =
REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
static const struct reg_field stk3310_reg_field_als_it =
REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
static const struct reg_field stk3310_reg_field_ps_it =
REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
static const struct reg_field stk3310_reg_field_int_ps =
REG_FIELD(STK3310_REG_INT, 0, 2);
static const struct reg_field stk3310_reg_field_flag_psint =
REG_FIELD(STK3310_REG_FLAG, 4, 4);
static const struct reg_field stk3310_reg_field_flag_nf =
REG_FIELD(STK3310_REG_FLAG, 0, 0);
/* Estimate maximum proximity values with regard to measurement scale. */
static const int stk3310_ps_max[4] = {
STK3310_PS_MAX_VAL / 640,
STK3310_PS_MAX_VAL / 160,
STK3310_PS_MAX_VAL / 40,
STK3310_PS_MAX_VAL / 10
};
static const int stk3310_scale_table[][2] = {
{6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
};
/* Integration time in seconds, microseconds */
static const int stk3310_it_table[][2] = {
{0, 185}, {0, 370}, {0, 741}, {0, 1480},
{0, 2960}, {0, 5920}, {0, 11840}, {0, 23680},
{0, 47360}, {0, 94720}, {0, 189440}, {0, 378880},
{0, 757760}, {1, 515520}, {3, 31040}, {6, 62080},
};
struct stk3310_data {
struct i2c_client *client;
struct mutex lock;
bool als_enabled;
bool ps_enabled;
u64 timestamp;
struct regmap *regmap;
struct regmap_field *reg_state;
struct regmap_field *reg_als_gain;
struct regmap_field *reg_ps_gain;
struct regmap_field *reg_als_it;
struct regmap_field *reg_ps_it;
struct regmap_field *reg_int_ps;
struct regmap_field *reg_flag_psint;
struct regmap_field *reg_flag_nf;
};
static const struct iio_event_spec stk3310_events[] = {
/* Proximity event */
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
},
/* Out-of-proximity event */
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
},
};
static const struct iio_chan_spec stk3310_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME),
},
{
.type = IIO_PROXIMITY,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME),
.event_spec = stk3310_events,
.num_event_specs = ARRAY_SIZE(stk3310_events),
}
};
static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
static IIO_CONST_ATTR(in_illuminance_integration_time_available,
STK3310_IT_AVAILABLE);
static IIO_CONST_ATTR(in_proximity_integration_time_available,
STK3310_IT_AVAILABLE);
static struct attribute *stk3310_attributes[] = {
&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
NULL,
};
static const struct attribute_group stk3310_attribute_group = {
.attrs = stk3310_attributes
};
static int stk3310_get_index(const int table[][2], int table_size,
int val, int val2)
{
int i;
for (i = 0; i < table_size; i++) {
if (val == table[i][0] && val2 == table[i][1])
return i;
}
return -EINVAL;
}
static int stk3310_read_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
u8 reg;
__be16 buf;
int ret;
struct stk3310_data *data = iio_priv(indio_dev);
if (info != IIO_EV_INFO_VALUE)
return -EINVAL;
/* Only proximity interrupts are implemented at the moment. */
if (dir == IIO_EV_DIR_RISING)
reg = STK3310_REG_THDH_PS;
else if (dir == IIO_EV_DIR_FALLING)
reg = STK3310_REG_THDL_PS;
else
return -EINVAL;
mutex_lock(&data->lock);
ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
mutex_unlock(&data->lock);
if (ret < 0) {
dev_err(&data->client->dev, "register read failed\n");
return ret;
}
*val = be16_to_cpu(buf);
return IIO_VAL_INT;
}
static int stk3310_write_event(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
u8 reg;
__be16 buf;
int ret;
unsigned int index;
struct stk3310_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
regmap_field_read(data->reg_ps_gain, &index);
if (val > stk3310_ps_max[index])
return -EINVAL;
if (dir == IIO_EV_DIR_RISING)
reg = STK3310_REG_THDH_PS;
else if (dir == IIO_EV_DIR_FALLING)
reg = STK3310_REG_THDL_PS;
else
return -EINVAL;
buf = cpu_to_be16(val);
ret = regmap_bulk_write(data->regmap, reg, &buf, 2);
if (ret < 0)
dev_err(&client->dev, "failed to set PS threshold!\n");
return ret;
}
static int stk3310_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
unsigned int event_val;
struct stk3310_data *data = iio_priv(indio_dev);
regmap_field_read(data->reg_int_ps, &event_val);
return event_val;
}
static int stk3310_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int state)
{
int ret;
struct stk3310_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
if (state < 0 || state > 7)
return -EINVAL;
/* Set INT_PS value */
mutex_lock(&data->lock);
ret = regmap_field_write(data->reg_int_ps, state);
if (ret < 0)
dev_err(&client->dev, "failed to set interrupt mode\n");
mutex_unlock(&data->lock);
return ret;
}
static int stk3310_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
u8 reg;
__be16 buf;
int ret;
unsigned int index;
struct stk3310_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (chan->type == IIO_LIGHT)
reg = STK3310_REG_ALS_DATA_MSB;
else if (chan->type == IIO_PROXIMITY)
reg = STK3310_REG_PS_DATA_MSB;
else
return -EINVAL;
mutex_lock(&data->lock);
ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
if (ret < 0) {
dev_err(&client->dev, "register read failed\n");
mutex_unlock(&data->lock);
return ret;
}
*val = be16_to_cpu(buf);
mutex_unlock(&data->lock);
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME:
if (chan->type == IIO_LIGHT)
regmap_field_read(data->reg_als_it, &index);
else
regmap_field_read(data->reg_ps_it, &index);
*val = stk3310_it_table[index][0];
*val2 = stk3310_it_table[index][1];
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SCALE:
if (chan->type == IIO_LIGHT)
regmap_field_read(data->reg_als_gain, &index);
else
regmap_field_read(data->reg_ps_gain, &index);
*val = stk3310_scale_table[index][0];
*val2 = stk3310_scale_table[index][1];
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static int stk3310_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
int ret;
int index;
struct stk3310_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
index = stk3310_get_index(stk3310_it_table,
ARRAY_SIZE(stk3310_it_table),
val, val2);
if (index < 0)
return -EINVAL;
mutex_lock(&data->lock);
if (chan->type == IIO_LIGHT)
ret = regmap_field_write(data->reg_als_it, index);
else
ret = regmap_field_write(data->reg_ps_it, index);
if (ret < 0)
dev_err(&data->client->dev,
"sensor configuration failed\n");
mutex_unlock(&data->lock);
return ret;
case IIO_CHAN_INFO_SCALE:
index = stk3310_get_index(stk3310_scale_table,
ARRAY_SIZE(stk3310_scale_table),
val, val2);
if (index < 0)
return -EINVAL;
mutex_lock(&data->lock);
if (chan->type == IIO_LIGHT)
ret = regmap_field_write(data->reg_als_gain, index);
else
ret = regmap_field_write(data->reg_ps_gain, index);
if (ret < 0)
dev_err(&data->client->dev,
"sensor configuration failed\n");
mutex_unlock(&data->lock);
return ret;
}
return -EINVAL;
}
static const struct iio_info stk3310_info = {
.driver_module = THIS_MODULE,
.read_raw = stk3310_read_raw,
.write_raw = stk3310_write_raw,
.attrs = &stk3310_attribute_group,
.read_event_value = stk3310_read_event,
.write_event_value = stk3310_write_event,
.read_event_config = stk3310_read_event_config,
.write_event_config = stk3310_write_event_config,
};
static int stk3310_set_state(struct stk3310_data *data, u8 state)
{
int ret;
struct i2c_client *client = data->client;
/* 3-bit state; 0b100 is not supported. */
if (state > 7 || state == 4)
return -EINVAL;
mutex_lock(&data->lock);
ret = regmap_field_write(data->reg_state, state);
if (ret < 0) {
dev_err(&client->dev, "failed to change sensor state\n");
} else if (state != STK3310_STATE_STANDBY) {
/* Don't reset the 'enabled' flags if we're going in standby */
data->ps_enabled = !!(state & 0x01);
data->als_enabled = !!(state & 0x02);
}
mutex_unlock(&data->lock);
return ret;
}
static int stk3310_init(struct iio_dev *indio_dev)
{
int ret;
int chipid;
u8 state;
struct stk3310_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
regmap_read(data->regmap, STK3310_REG_ID, &chipid);
if (chipid != STK3310_CHIP_ID_VAL &&
chipid != STK3311_CHIP_ID_VAL) {
dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
return -ENODEV;
}
state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
ret = stk3310_set_state(data, state);
if (ret < 0) {
dev_err(&client->dev, "failed to enable sensor");
return ret;
}
/* Enable PS interrupts */
ret = regmap_field_write(data->reg_int_ps, STK3310_PSINT_EN);
if (ret < 0)
dev_err(&client->dev, "failed to enable interrupts!\n");
return ret;
}
static int stk3310_gpio_probe(struct i2c_client *client)
{
struct device *dev;
struct gpio_desc *gpio;
int ret;
if (!client)
return -EINVAL;
dev = &client->dev;
/* gpio interrupt pin */
gpio = devm_gpiod_get_index(dev, STK3310_GPIO, 0);
if (IS_ERR(gpio)) {
dev_err(dev, "acpi gpio get index failed\n");
return PTR_ERR(gpio);
}
ret = gpiod_direction_input(gpio);
if (ret)
return ret;
ret = gpiod_to_irq(gpio);
dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
return ret;
}
static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case STK3310_REG_ALS_DATA_MSB:
case STK3310_REG_ALS_DATA_LSB:
case STK3310_REG_PS_DATA_LSB:
case STK3310_REG_PS_DATA_MSB:
case STK3310_REG_FLAG:
return true;
default:
return false;
}
}
static struct regmap_config stk3310_regmap_config = {
.name = STK3310_REGMAP_NAME,
.reg_bits = 8,
.val_bits = 8,
.max_register = STK3310_MAX_REG,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = stk3310_is_volatile_reg,
};
static int stk3310_regmap_init(struct stk3310_data *data)
{
struct regmap *regmap;
struct i2c_client *client;
client = data->client;
regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "regmap initialization failed.\n");
return PTR_ERR(regmap);
}
data->regmap = regmap;
STK3310_REGFIELD(state);
STK3310_REGFIELD(als_gain);
STK3310_REGFIELD(ps_gain);
STK3310_REGFIELD(als_it);
STK3310_REGFIELD(ps_it);
STK3310_REGFIELD(int_ps);
STK3310_REGFIELD(flag_psint);
STK3310_REGFIELD(flag_nf);
return 0;
}
static irqreturn_t stk3310_irq_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct stk3310_data *data = iio_priv(indio_dev);
data->timestamp = iio_get_time_ns();
return IRQ_WAKE_THREAD;
}
static irqreturn_t stk3310_irq_event_handler(int irq, void *private)
{
int ret;
unsigned int dir;
u64 event;
struct iio_dev *indio_dev = private;
struct stk3310_data *data = iio_priv(indio_dev);
/* Read FLAG_NF to figure out what threshold has been met. */
mutex_lock(&data->lock);
ret = regmap_field_read(data->reg_flag_nf, &dir);
if (ret < 0) {
dev_err(&data->client->dev, "register read failed\n");
mutex_unlock(&data->lock);
return ret;
}
event = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
IIO_EV_TYPE_THRESH,
(dir ? IIO_EV_DIR_FALLING :
IIO_EV_DIR_RISING));
iio_push_event(indio_dev, event, data->timestamp);
/* Reset the interrupt flag */
ret = regmap_field_write(data->reg_flag_psint, 0);
if (ret < 0)
dev_err(&data->client->dev, "failed to reset interrupts\n");
mutex_unlock(&data->lock);
return IRQ_HANDLED;
}
static int stk3310_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct iio_dev *indio_dev;
struct stk3310_data *data;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev) {
dev_err(&client->dev, "iio allocation failed!\n");
return -ENOMEM;
}
data = iio_priv(indio_dev);
data->client = client;
i2c_set_clientdata(client, indio_dev);
mutex_init(&data->lock);
ret = stk3310_regmap_init(data);
if (ret < 0)
return ret;
indio_dev->dev.parent = &client->dev;
indio_dev->info = &stk3310_info;
indio_dev->name = STK3310_DRIVER_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = stk3310_channels;
indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
ret = stk3310_init(indio_dev);
if (ret < 0)
return ret;
if (client->irq < 0)
client->irq = stk3310_gpio_probe(client);
if (client->irq >= 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
stk3310_irq_handler,
stk3310_irq_event_handler,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
STK3310_EVENT, indio_dev);
if (ret < 0)
dev_err(&client->dev, "request irq %d failed\n",
client->irq);
}
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "device_register failed\n");
stk3310_set_state(data, STK3310_STATE_STANDBY);
}
return ret;
}
static int stk3310_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
}
#ifdef CONFIG_PM_SLEEP
static int stk3310_suspend(struct device *dev)
{
struct stk3310_data *data;
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
return stk3310_set_state(data, STK3310_STATE_STANDBY);
}
static int stk3310_resume(struct device *dev)
{
int state = 0;
struct stk3310_data *data;
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
if (data->ps_enabled)
state |= STK3310_STATE_EN_PS;
if (data->als_enabled)
state |= STK3310_STATE_EN_ALS;
return stk3310_set_state(data, state);
}
static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
#define STK3310_PM_OPS (&stk3310_pm_ops)
#else
#define STK3310_PM_OPS NULL
#endif
static const struct i2c_device_id stk3310_i2c_id[] = {
{"STK3310", 0},
{"STK3311", 0},
{}
};
static const struct acpi_device_id stk3310_acpi_id[] = {
{"STK3310", 0},
{"STK3311", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
static struct i2c_driver stk3310_driver = {
.driver = {
.name = "stk3310",
.pm = STK3310_PM_OPS,
.acpi_match_table = ACPI_PTR(stk3310_acpi_id),
},
.probe = stk3310_probe,
.remove = stk3310_remove,
.id_table = stk3310_i2c_id,
};
module_i2c_driver(stk3310_driver);
MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
MODULE_LICENSE("GPL v2");
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