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iio: light: Add threshold interrupt support for STK3310 

Added interrupt support for proximity threshold events
to the stk3310 driver.

Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Tiberiu Breana 2015-04-27 18:34:01 +03:00 committed by Jonathan Cameron
parent be9e6229d6
commit 3dd477acbd
1 changed files with 253 additions and 2 deletions
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255
drivers/iio/light/stk3310.c
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@ -12,15 +12,22 @@
#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
@ -34,10 +41,14 @@
#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_THRESH_MAX 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"
@ -67,7 +78,12 @@ 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);
/*
* Maximum PS values with regard to scale. Used to export the 'inverse'
* PS value (high values for far objects, low values for near objects).
@ -96,12 +112,33 @@ struct stk3310_data {
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_FALLING,
.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_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
},
};
static const struct iio_chan_spec stk3310_channels[] = {
@ -118,6 +155,8 @@ static const struct iio_chan_spec stk3310_channels[] = {
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),
}
};
@ -156,6 +195,118 @@ static int stk3310_get_index(const int table[][2], int table_size,
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;
u16 buf;
int ret;
unsigned int index;
struct stk3310_data *data = iio_priv(indio_dev);
if (info != IIO_EV_INFO_VALUE)
return -EINVAL;
/*
* Only proximity interrupts are implemented at the moment.
* Since we're inverting proximity values, the sensor's 'high'
* threshold will become our 'low' threshold, associated with
* 'near' events. Similarly, the sensor's 'low' threshold will
* be our 'high' threshold, associated with 'far' events.
*/
if (dir == IIO_EV_DIR_RISING)
reg = STK3310_REG_THDL_PS;
else if (dir == IIO_EV_DIR_FALLING)
reg = STK3310_REG_THDH_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;
}
regmap_field_read(data->reg_ps_gain, &index);
*val = swab16(stk3310_ps_max[index] - 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;
u16 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_THDL_PS;
else if (dir == IIO_EV_DIR_FALLING)
reg = STK3310_REG_THDH_PS;
else
return -EINVAL;
buf = swab16(stk3310_ps_max[index] - 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)
@ -266,6 +417,10 @@ static const struct iio_info stk3310_info = {
.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)
@ -308,8 +463,43 @@ static int stk3310_init(struct iio_dev *indio_dev)
state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
ret = stk3310_set_state(data, state);
if (ret < 0)
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;
}
@ -321,6 +511,7 @@ static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
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;
@ -354,10 +545,55 @@ static int stk3310_regmap_init(struct stk3310_data *data)
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_RISING :
IIO_EV_DIR_FALLING));
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)
{
@ -397,6 +633,21 @@ static int stk3310_probe(struct i2c_client *client,
stk3310_set_state(data, STK3310_STATE_STANDBY);
}
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);
}
return ret;
}