mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Gregor Boirie](/assets/img/avatar_default.png)
Adds a new per-device sysfs attribute "current_timestamp_clock" to allow userspace to select a particular POSIX clock for buffered samples and events timestamping. Following clocks, as listed in clock_gettime(2), are supported: CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW, CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and CLOCK_TAI. Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com> Acked-by: Sanchayan Maity <maitysanchayan@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
900 lines
21 KiB
C
900 lines
21 KiB
C
/*
|
|
* drivers/iio/light/tsl2563.c
|
|
*
|
|
* Copyright (C) 2008 Nokia Corporation
|
|
*
|
|
* Written by Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
|
|
* Contact: Amit Kucheria <amit.kucheria@verdurent.com>
|
|
*
|
|
* Converted to IIO driver
|
|
* Amit Kucheria <amit.kucheria@verdurent.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
#include <linux/iio/events.h>
|
|
#include <linux/platform_data/tsl2563.h>
|
|
|
|
/* Use this many bits for fraction part. */
|
|
#define ADC_FRAC_BITS 14
|
|
|
|
/* Given number of 1/10000's in ADC_FRAC_BITS precision. */
|
|
#define FRAC10K(f) (((f) * (1L << (ADC_FRAC_BITS))) / (10000))
|
|
|
|
/* Bits used for fraction in calibration coefficients.*/
|
|
#define CALIB_FRAC_BITS 10
|
|
/* 0.5 in CALIB_FRAC_BITS precision */
|
|
#define CALIB_FRAC_HALF (1 << (CALIB_FRAC_BITS - 1))
|
|
/* Make a fraction from a number n that was multiplied with b. */
|
|
#define CALIB_FRAC(n, b) (((n) << CALIB_FRAC_BITS) / (b))
|
|
/* Decimal 10^(digits in sysfs presentation) */
|
|
#define CALIB_BASE_SYSFS 1000
|
|
|
|
#define TSL2563_CMD 0x80
|
|
#define TSL2563_CLEARINT 0x40
|
|
|
|
#define TSL2563_REG_CTRL 0x00
|
|
#define TSL2563_REG_TIMING 0x01
|
|
#define TSL2563_REG_LOWLOW 0x02 /* data0 low threshold, 2 bytes */
|
|
#define TSL2563_REG_LOWHIGH 0x03
|
|
#define TSL2563_REG_HIGHLOW 0x04 /* data0 high threshold, 2 bytes */
|
|
#define TSL2563_REG_HIGHHIGH 0x05
|
|
#define TSL2563_REG_INT 0x06
|
|
#define TSL2563_REG_ID 0x0a
|
|
#define TSL2563_REG_DATA0LOW 0x0c /* broadband sensor value, 2 bytes */
|
|
#define TSL2563_REG_DATA0HIGH 0x0d
|
|
#define TSL2563_REG_DATA1LOW 0x0e /* infrared sensor value, 2 bytes */
|
|
#define TSL2563_REG_DATA1HIGH 0x0f
|
|
|
|
#define TSL2563_CMD_POWER_ON 0x03
|
|
#define TSL2563_CMD_POWER_OFF 0x00
|
|
#define TSL2563_CTRL_POWER_MASK 0x03
|
|
|
|
#define TSL2563_TIMING_13MS 0x00
|
|
#define TSL2563_TIMING_100MS 0x01
|
|
#define TSL2563_TIMING_400MS 0x02
|
|
#define TSL2563_TIMING_MASK 0x03
|
|
#define TSL2563_TIMING_GAIN16 0x10
|
|
#define TSL2563_TIMING_GAIN1 0x00
|
|
|
|
#define TSL2563_INT_DISBLED 0x00
|
|
#define TSL2563_INT_LEVEL 0x10
|
|
#define TSL2563_INT_PERSIST(n) ((n) & 0x0F)
|
|
|
|
struct tsl2563_gainlevel_coeff {
|
|
u8 gaintime;
|
|
u16 min;
|
|
u16 max;
|
|
};
|
|
|
|
static const struct tsl2563_gainlevel_coeff tsl2563_gainlevel_table[] = {
|
|
{
|
|
.gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN16,
|
|
.min = 0,
|
|
.max = 65534,
|
|
}, {
|
|
.gaintime = TSL2563_TIMING_400MS | TSL2563_TIMING_GAIN1,
|
|
.min = 2048,
|
|
.max = 65534,
|
|
}, {
|
|
.gaintime = TSL2563_TIMING_100MS | TSL2563_TIMING_GAIN1,
|
|
.min = 4095,
|
|
.max = 37177,
|
|
}, {
|
|
.gaintime = TSL2563_TIMING_13MS | TSL2563_TIMING_GAIN1,
|
|
.min = 3000,
|
|
.max = 65535,
|
|
},
|
|
};
|
|
|
|
struct tsl2563_chip {
|
|
struct mutex lock;
|
|
struct i2c_client *client;
|
|
struct delayed_work poweroff_work;
|
|
|
|
/* Remember state for suspend and resume functions */
|
|
bool suspended;
|
|
|
|
struct tsl2563_gainlevel_coeff const *gainlevel;
|
|
|
|
u16 low_thres;
|
|
u16 high_thres;
|
|
u8 intr;
|
|
bool int_enabled;
|
|
|
|
/* Calibration coefficients */
|
|
u32 calib0;
|
|
u32 calib1;
|
|
int cover_comp_gain;
|
|
|
|
/* Cache current values, to be returned while suspended */
|
|
u32 data0;
|
|
u32 data1;
|
|
};
|
|
|
|
static int tsl2563_set_power(struct tsl2563_chip *chip, int on)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
u8 cmd;
|
|
|
|
cmd = on ? TSL2563_CMD_POWER_ON : TSL2563_CMD_POWER_OFF;
|
|
return i2c_smbus_write_byte_data(client,
|
|
TSL2563_CMD | TSL2563_REG_CTRL, cmd);
|
|
}
|
|
|
|
/*
|
|
* Return value is 0 for off, 1 for on, or a negative error
|
|
* code if reading failed.
|
|
*/
|
|
static int tsl2563_get_power(struct tsl2563_chip *chip)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
int ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_CTRL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return (ret & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
|
|
}
|
|
|
|
static int tsl2563_configure(struct tsl2563_chip *chip)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_TIMING,
|
|
chip->gainlevel->gaintime);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_HIGHLOW,
|
|
chip->high_thres & 0xFF);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_HIGHHIGH,
|
|
(chip->high_thres >> 8) & 0xFF);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_LOWLOW,
|
|
chip->low_thres & 0xFF);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_LOWHIGH,
|
|
(chip->low_thres >> 8) & 0xFF);
|
|
/*
|
|
* Interrupt register is automatically written anyway if it is relevant
|
|
* so is not here.
|
|
*/
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static void tsl2563_poweroff_work(struct work_struct *work)
|
|
{
|
|
struct tsl2563_chip *chip =
|
|
container_of(work, struct tsl2563_chip, poweroff_work.work);
|
|
tsl2563_set_power(chip, 0);
|
|
}
|
|
|
|
static int tsl2563_detect(struct tsl2563_chip *chip)
|
|
{
|
|
int ret;
|
|
|
|
ret = tsl2563_set_power(chip, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = tsl2563_get_power(chip);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return ret ? 0 : -ENODEV;
|
|
}
|
|
|
|
static int tsl2563_read_id(struct tsl2563_chip *chip, u8 *id)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
int ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, TSL2563_CMD | TSL2563_REG_ID);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*id = ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* "Normalized" ADC value is one obtained with 400ms of integration time and
|
|
* 16x gain. This function returns the number of bits of shift needed to
|
|
* convert between normalized values and HW values obtained using given
|
|
* timing and gain settings.
|
|
*/
|
|
static int tsl2563_adc_shiftbits(u8 timing)
|
|
{
|
|
int shift = 0;
|
|
|
|
switch (timing & TSL2563_TIMING_MASK) {
|
|
case TSL2563_TIMING_13MS:
|
|
shift += 5;
|
|
break;
|
|
case TSL2563_TIMING_100MS:
|
|
shift += 2;
|
|
break;
|
|
case TSL2563_TIMING_400MS:
|
|
/* no-op */
|
|
break;
|
|
}
|
|
|
|
if (!(timing & TSL2563_TIMING_GAIN16))
|
|
shift += 4;
|
|
|
|
return shift;
|
|
}
|
|
|
|
/* Convert a HW ADC value to normalized scale. */
|
|
static u32 tsl2563_normalize_adc(u16 adc, u8 timing)
|
|
{
|
|
return adc << tsl2563_adc_shiftbits(timing);
|
|
}
|
|
|
|
static void tsl2563_wait_adc(struct tsl2563_chip *chip)
|
|
{
|
|
unsigned int delay;
|
|
|
|
switch (chip->gainlevel->gaintime & TSL2563_TIMING_MASK) {
|
|
case TSL2563_TIMING_13MS:
|
|
delay = 14;
|
|
break;
|
|
case TSL2563_TIMING_100MS:
|
|
delay = 101;
|
|
break;
|
|
default:
|
|
delay = 402;
|
|
}
|
|
/*
|
|
* TODO: Make sure that we wait at least required delay but why we
|
|
* have to extend it one tick more?
|
|
*/
|
|
schedule_timeout_interruptible(msecs_to_jiffies(delay) + 2);
|
|
}
|
|
|
|
static int tsl2563_adjust_gainlevel(struct tsl2563_chip *chip, u16 adc)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
|
|
if (adc > chip->gainlevel->max || adc < chip->gainlevel->min) {
|
|
|
|
(adc > chip->gainlevel->max) ?
|
|
chip->gainlevel++ : chip->gainlevel--;
|
|
|
|
i2c_smbus_write_byte_data(client,
|
|
TSL2563_CMD | TSL2563_REG_TIMING,
|
|
chip->gainlevel->gaintime);
|
|
|
|
tsl2563_wait_adc(chip);
|
|
tsl2563_wait_adc(chip);
|
|
|
|
return 1;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
static int tsl2563_get_adc(struct tsl2563_chip *chip)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
u16 adc0, adc1;
|
|
int retry = 1;
|
|
int ret = 0;
|
|
|
|
if (chip->suspended)
|
|
goto out;
|
|
|
|
if (!chip->int_enabled) {
|
|
cancel_delayed_work(&chip->poweroff_work);
|
|
|
|
if (!tsl2563_get_power(chip)) {
|
|
ret = tsl2563_set_power(chip, 1);
|
|
if (ret)
|
|
goto out;
|
|
ret = tsl2563_configure(chip);
|
|
if (ret)
|
|
goto out;
|
|
tsl2563_wait_adc(chip);
|
|
}
|
|
}
|
|
|
|
while (retry) {
|
|
ret = i2c_smbus_read_word_data(client,
|
|
TSL2563_CMD | TSL2563_REG_DATA0LOW);
|
|
if (ret < 0)
|
|
goto out;
|
|
adc0 = ret;
|
|
|
|
ret = i2c_smbus_read_word_data(client,
|
|
TSL2563_CMD | TSL2563_REG_DATA1LOW);
|
|
if (ret < 0)
|
|
goto out;
|
|
adc1 = ret;
|
|
|
|
retry = tsl2563_adjust_gainlevel(chip, adc0);
|
|
}
|
|
|
|
chip->data0 = tsl2563_normalize_adc(adc0, chip->gainlevel->gaintime);
|
|
chip->data1 = tsl2563_normalize_adc(adc1, chip->gainlevel->gaintime);
|
|
|
|
if (!chip->int_enabled)
|
|
schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static inline int tsl2563_calib_to_sysfs(u32 calib)
|
|
{
|
|
return (int) (((calib * CALIB_BASE_SYSFS) +
|
|
CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
|
|
}
|
|
|
|
static inline u32 tsl2563_calib_from_sysfs(int value)
|
|
{
|
|
return (((u32) value) << CALIB_FRAC_BITS) / CALIB_BASE_SYSFS;
|
|
}
|
|
|
|
/*
|
|
* Conversions between lux and ADC values.
|
|
*
|
|
* The basic formula is lux = c0 * adc0 - c1 * adc1, where c0 and c1 are
|
|
* appropriate constants. Different constants are needed for different
|
|
* kinds of light, determined by the ratio adc1/adc0 (basically the ratio
|
|
* of the intensities in infrared and visible wavelengths). lux_table below
|
|
* lists the upper threshold of the adc1/adc0 ratio and the corresponding
|
|
* constants.
|
|
*/
|
|
|
|
struct tsl2563_lux_coeff {
|
|
unsigned long ch_ratio;
|
|
unsigned long ch0_coeff;
|
|
unsigned long ch1_coeff;
|
|
};
|
|
|
|
static const struct tsl2563_lux_coeff lux_table[] = {
|
|
{
|
|
.ch_ratio = FRAC10K(1300),
|
|
.ch0_coeff = FRAC10K(315),
|
|
.ch1_coeff = FRAC10K(262),
|
|
}, {
|
|
.ch_ratio = FRAC10K(2600),
|
|
.ch0_coeff = FRAC10K(337),
|
|
.ch1_coeff = FRAC10K(430),
|
|
}, {
|
|
.ch_ratio = FRAC10K(3900),
|
|
.ch0_coeff = FRAC10K(363),
|
|
.ch1_coeff = FRAC10K(529),
|
|
}, {
|
|
.ch_ratio = FRAC10K(5200),
|
|
.ch0_coeff = FRAC10K(392),
|
|
.ch1_coeff = FRAC10K(605),
|
|
}, {
|
|
.ch_ratio = FRAC10K(6500),
|
|
.ch0_coeff = FRAC10K(229),
|
|
.ch1_coeff = FRAC10K(291),
|
|
}, {
|
|
.ch_ratio = FRAC10K(8000),
|
|
.ch0_coeff = FRAC10K(157),
|
|
.ch1_coeff = FRAC10K(180),
|
|
}, {
|
|
.ch_ratio = FRAC10K(13000),
|
|
.ch0_coeff = FRAC10K(34),
|
|
.ch1_coeff = FRAC10K(26),
|
|
}, {
|
|
.ch_ratio = ULONG_MAX,
|
|
.ch0_coeff = 0,
|
|
.ch1_coeff = 0,
|
|
},
|
|
};
|
|
|
|
/* Convert normalized, scaled ADC values to lux. */
|
|
static unsigned int tsl2563_adc_to_lux(u32 adc0, u32 adc1)
|
|
{
|
|
const struct tsl2563_lux_coeff *lp = lux_table;
|
|
unsigned long ratio, lux, ch0 = adc0, ch1 = adc1;
|
|
|
|
ratio = ch0 ? ((ch1 << ADC_FRAC_BITS) / ch0) : ULONG_MAX;
|
|
|
|
while (lp->ch_ratio < ratio)
|
|
lp++;
|
|
|
|
lux = ch0 * lp->ch0_coeff - ch1 * lp->ch1_coeff;
|
|
|
|
return (unsigned int) (lux >> ADC_FRAC_BITS);
|
|
}
|
|
|
|
/* Apply calibration coefficient to ADC count. */
|
|
static u32 tsl2563_calib_adc(u32 adc, u32 calib)
|
|
{
|
|
unsigned long scaled = adc;
|
|
|
|
scaled *= calib;
|
|
scaled >>= CALIB_FRAC_BITS;
|
|
|
|
return (u32) scaled;
|
|
}
|
|
|
|
static int tsl2563_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val,
|
|
int val2,
|
|
long mask)
|
|
{
|
|
struct tsl2563_chip *chip = iio_priv(indio_dev);
|
|
|
|
if (mask != IIO_CHAN_INFO_CALIBSCALE)
|
|
return -EINVAL;
|
|
if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
|
|
chip->calib0 = tsl2563_calib_from_sysfs(val);
|
|
else if (chan->channel2 == IIO_MOD_LIGHT_IR)
|
|
chip->calib1 = tsl2563_calib_from_sysfs(val);
|
|
else
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tsl2563_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val,
|
|
int *val2,
|
|
long mask)
|
|
{
|
|
int ret = -EINVAL;
|
|
u32 calib0, calib1;
|
|
struct tsl2563_chip *chip = iio_priv(indio_dev);
|
|
|
|
mutex_lock(&chip->lock);
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
case IIO_CHAN_INFO_PROCESSED:
|
|
switch (chan->type) {
|
|
case IIO_LIGHT:
|
|
ret = tsl2563_get_adc(chip);
|
|
if (ret)
|
|
goto error_ret;
|
|
calib0 = tsl2563_calib_adc(chip->data0, chip->calib0) *
|
|
chip->cover_comp_gain;
|
|
calib1 = tsl2563_calib_adc(chip->data1, chip->calib1) *
|
|
chip->cover_comp_gain;
|
|
*val = tsl2563_adc_to_lux(calib0, calib1);
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
case IIO_INTENSITY:
|
|
ret = tsl2563_get_adc(chip);
|
|
if (ret)
|
|
goto error_ret;
|
|
if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
|
|
*val = chip->data0;
|
|
else
|
|
*val = chip->data1;
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case IIO_CHAN_INFO_CALIBSCALE:
|
|
if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
|
|
*val = tsl2563_calib_to_sysfs(chip->calib0);
|
|
else
|
|
*val = tsl2563_calib_to_sysfs(chip->calib1);
|
|
ret = IIO_VAL_INT;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
goto error_ret;
|
|
}
|
|
|
|
error_ret:
|
|
mutex_unlock(&chip->lock);
|
|
return ret;
|
|
}
|
|
|
|
static const struct iio_event_spec tsl2563_events[] = {
|
|
{
|
|
.type = IIO_EV_TYPE_THRESH,
|
|
.dir = IIO_EV_DIR_RISING,
|
|
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
|
|
BIT(IIO_EV_INFO_ENABLE),
|
|
}, {
|
|
.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 tsl2563_channels[] = {
|
|
{
|
|
.type = IIO_LIGHT,
|
|
.indexed = 1,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
|
|
.channel = 0,
|
|
}, {
|
|
.type = IIO_INTENSITY,
|
|
.modified = 1,
|
|
.channel2 = IIO_MOD_LIGHT_BOTH,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
|
BIT(IIO_CHAN_INFO_CALIBSCALE),
|
|
.event_spec = tsl2563_events,
|
|
.num_event_specs = ARRAY_SIZE(tsl2563_events),
|
|
}, {
|
|
.type = IIO_INTENSITY,
|
|
.modified = 1,
|
|
.channel2 = IIO_MOD_LIGHT_IR,
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
|
BIT(IIO_CHAN_INFO_CALIBSCALE),
|
|
}
|
|
};
|
|
|
|
static int tsl2563_read_thresh(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)
|
|
{
|
|
struct tsl2563_chip *chip = iio_priv(indio_dev);
|
|
|
|
switch (dir) {
|
|
case IIO_EV_DIR_RISING:
|
|
*val = chip->high_thres;
|
|
break;
|
|
case IIO_EV_DIR_FALLING:
|
|
*val = chip->low_thres;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
static int tsl2563_write_thresh(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)
|
|
{
|
|
struct tsl2563_chip *chip = iio_priv(indio_dev);
|
|
int ret;
|
|
u8 address;
|
|
|
|
if (dir == IIO_EV_DIR_RISING)
|
|
address = TSL2563_REG_HIGHLOW;
|
|
else
|
|
address = TSL2563_REG_LOWLOW;
|
|
mutex_lock(&chip->lock);
|
|
ret = i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | address,
|
|
val & 0xFF);
|
|
if (ret)
|
|
goto error_ret;
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | (address + 1),
|
|
(val >> 8) & 0xFF);
|
|
if (dir == IIO_EV_DIR_RISING)
|
|
chip->high_thres = val;
|
|
else
|
|
chip->low_thres = val;
|
|
|
|
error_ret:
|
|
mutex_unlock(&chip->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t tsl2563_event_handler(int irq, void *private)
|
|
{
|
|
struct iio_dev *dev_info = private;
|
|
struct tsl2563_chip *chip = iio_priv(dev_info);
|
|
|
|
iio_push_event(dev_info,
|
|
IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
|
|
0,
|
|
IIO_EV_TYPE_THRESH,
|
|
IIO_EV_DIR_EITHER),
|
|
iio_get_time_ns(dev_info));
|
|
|
|
/* clear the interrupt and push the event */
|
|
i2c_smbus_write_byte(chip->client, TSL2563_CMD | TSL2563_CLEARINT);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int tsl2563_write_interrupt_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan, enum iio_event_type type,
|
|
enum iio_event_direction dir, int state)
|
|
{
|
|
struct tsl2563_chip *chip = iio_priv(indio_dev);
|
|
int ret = 0;
|
|
|
|
mutex_lock(&chip->lock);
|
|
if (state && !(chip->intr & 0x30)) {
|
|
chip->intr &= ~0x30;
|
|
chip->intr |= 0x10;
|
|
/* ensure the chip is actually on */
|
|
cancel_delayed_work(&chip->poweroff_work);
|
|
if (!tsl2563_get_power(chip)) {
|
|
ret = tsl2563_set_power(chip, 1);
|
|
if (ret)
|
|
goto out;
|
|
ret = tsl2563_configure(chip);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_INT,
|
|
chip->intr);
|
|
chip->int_enabled = true;
|
|
}
|
|
|
|
if (!state && (chip->intr & 0x30)) {
|
|
chip->intr &= ~0x30;
|
|
ret = i2c_smbus_write_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_INT,
|
|
chip->intr);
|
|
chip->int_enabled = false;
|
|
/* now the interrupt is not enabled, we can go to sleep */
|
|
schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
|
|
}
|
|
out:
|
|
mutex_unlock(&chip->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tsl2563_read_interrupt_config(struct iio_dev *indio_dev,
|
|
const struct iio_chan_spec *chan, enum iio_event_type type,
|
|
enum iio_event_direction dir)
|
|
{
|
|
struct tsl2563_chip *chip = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
mutex_lock(&chip->lock);
|
|
ret = i2c_smbus_read_byte_data(chip->client,
|
|
TSL2563_CMD | TSL2563_REG_INT);
|
|
mutex_unlock(&chip->lock);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return !!(ret & 0x30);
|
|
}
|
|
|
|
static const struct iio_info tsl2563_info_no_irq = {
|
|
.driver_module = THIS_MODULE,
|
|
.read_raw = &tsl2563_read_raw,
|
|
.write_raw = &tsl2563_write_raw,
|
|
};
|
|
|
|
static const struct iio_info tsl2563_info = {
|
|
.driver_module = THIS_MODULE,
|
|
.read_raw = &tsl2563_read_raw,
|
|
.write_raw = &tsl2563_write_raw,
|
|
.read_event_value = &tsl2563_read_thresh,
|
|
.write_event_value = &tsl2563_write_thresh,
|
|
.read_event_config = &tsl2563_read_interrupt_config,
|
|
.write_event_config = &tsl2563_write_interrupt_config,
|
|
};
|
|
|
|
static int tsl2563_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *device_id)
|
|
{
|
|
struct iio_dev *indio_dev;
|
|
struct tsl2563_chip *chip;
|
|
struct tsl2563_platform_data *pdata = client->dev.platform_data;
|
|
struct device_node *np = client->dev.of_node;
|
|
int err = 0;
|
|
u8 id = 0;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
chip = iio_priv(indio_dev);
|
|
|
|
i2c_set_clientdata(client, chip);
|
|
chip->client = client;
|
|
|
|
err = tsl2563_detect(chip);
|
|
if (err) {
|
|
dev_err(&client->dev, "detect error %d\n", -err);
|
|
return err;
|
|
}
|
|
|
|
err = tsl2563_read_id(chip, &id);
|
|
if (err) {
|
|
dev_err(&client->dev, "read id error %d\n", -err);
|
|
return err;
|
|
}
|
|
|
|
mutex_init(&chip->lock);
|
|
|
|
/* Default values used until userspace says otherwise */
|
|
chip->low_thres = 0x0;
|
|
chip->high_thres = 0xffff;
|
|
chip->gainlevel = tsl2563_gainlevel_table;
|
|
chip->intr = TSL2563_INT_PERSIST(4);
|
|
chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
|
|
chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
|
|
|
|
if (pdata)
|
|
chip->cover_comp_gain = pdata->cover_comp_gain;
|
|
else if (np)
|
|
of_property_read_u32(np, "amstaos,cover-comp-gain",
|
|
&chip->cover_comp_gain);
|
|
else
|
|
chip->cover_comp_gain = 1;
|
|
|
|
dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
|
|
indio_dev->name = client->name;
|
|
indio_dev->channels = tsl2563_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(tsl2563_channels);
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
if (client->irq)
|
|
indio_dev->info = &tsl2563_info;
|
|
else
|
|
indio_dev->info = &tsl2563_info_no_irq;
|
|
|
|
if (client->irq) {
|
|
err = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL,
|
|
&tsl2563_event_handler,
|
|
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
|
"tsl2563_event",
|
|
indio_dev);
|
|
if (err) {
|
|
dev_err(&client->dev, "irq request error %d\n", -err);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
err = tsl2563_configure(chip);
|
|
if (err) {
|
|
dev_err(&client->dev, "configure error %d\n", -err);
|
|
return err;
|
|
}
|
|
|
|
INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
|
|
|
|
/* The interrupt cannot yet be enabled so this is fine without lock */
|
|
schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
|
|
|
|
err = iio_device_register(indio_dev);
|
|
if (err) {
|
|
dev_err(&client->dev, "iio registration error %d\n", -err);
|
|
goto fail;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
cancel_delayed_work_sync(&chip->poweroff_work);
|
|
return err;
|
|
}
|
|
|
|
static int tsl2563_remove(struct i2c_client *client)
|
|
{
|
|
struct tsl2563_chip *chip = i2c_get_clientdata(client);
|
|
struct iio_dev *indio_dev = iio_priv_to_dev(chip);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
if (!chip->int_enabled)
|
|
cancel_delayed_work(&chip->poweroff_work);
|
|
/* Ensure that interrupts are disabled - then flush any bottom halves */
|
|
chip->intr &= ~0x30;
|
|
i2c_smbus_write_byte_data(chip->client, TSL2563_CMD | TSL2563_REG_INT,
|
|
chip->intr);
|
|
flush_scheduled_work();
|
|
tsl2563_set_power(chip, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int tsl2563_suspend(struct device *dev)
|
|
{
|
|
struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
|
|
int ret;
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
ret = tsl2563_set_power(chip, 0);
|
|
if (ret)
|
|
goto out;
|
|
|
|
chip->suspended = true;
|
|
|
|
out:
|
|
mutex_unlock(&chip->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int tsl2563_resume(struct device *dev)
|
|
{
|
|
struct tsl2563_chip *chip = i2c_get_clientdata(to_i2c_client(dev));
|
|
int ret;
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
ret = tsl2563_set_power(chip, 1);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = tsl2563_configure(chip);
|
|
if (ret)
|
|
goto out;
|
|
|
|
chip->suspended = false;
|
|
|
|
out:
|
|
mutex_unlock(&chip->lock);
|
|
return ret;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(tsl2563_pm_ops, tsl2563_suspend, tsl2563_resume);
|
|
#define TSL2563_PM_OPS (&tsl2563_pm_ops)
|
|
#else
|
|
#define TSL2563_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id tsl2563_id[] = {
|
|
{ "tsl2560", 0 },
|
|
{ "tsl2561", 1 },
|
|
{ "tsl2562", 2 },
|
|
{ "tsl2563", 3 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tsl2563_id);
|
|
|
|
static struct i2c_driver tsl2563_i2c_driver = {
|
|
.driver = {
|
|
.name = "tsl2563",
|
|
.pm = TSL2563_PM_OPS,
|
|
},
|
|
.probe = tsl2563_probe,
|
|
.remove = tsl2563_remove,
|
|
.id_table = tsl2563_id,
|
|
};
|
|
module_i2c_driver(tsl2563_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Nokia Corporation");
|
|
MODULE_DESCRIPTION("tsl2563 light sensor driver");
|
|
MODULE_LICENSE("GPL");
|