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Staging: iio: tsl2563 ambient light sensor driver

Browse source 
Add driver support for the tsl2563 TAOS ambient light sensor. After looking at
discussions on LKML, the driver was modified from a 'hwmon' driver to an 'iio'
driver. The sysfs interfaces have been tested on an RX51 (N900) to see if it
responds to changing light conditions.

The only real reason for submitting this to staging is that it is dependent on
the IIO subsystem.

Signed-off-by: Amit Kucheria <amit.kucheria@verdurent.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Amit Kucheria 2009-11-09 15:14:28 +02:00 committed by Greg Kroah-Hartman
parent 51bf00aef0
commit ee1f1fa407
4 changed files with 793 additions and 0 deletions
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11
drivers/staging/iio/light/Kconfig
View file

@ -11,3 +11,14 @@ config TSL2561
convertor. This chip has two light sensors. One is broadband
including infrared whilst the other measures only infrared.
Provides direct access via sysfs.
config SENSORS_TSL2563
tristate "TAOS TSL2563 ambient light sensor"
depends on I2C
help
If you say yes here you get support for the Taos TSL2563
ambient light sensor (found in N900).
This driver can also be built as a module. If so, the module
will be called tsl2563.

1
drivers/staging/iio/light/Makefile
View file

@ -3,3 +3,4 @@
#
obj-$(CONFIG_TSL2561) += tsl2561.o
obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o

772
drivers/staging/iio/light/tsl2563.c Normal file
View file

@ -0,0 +1,772 @@
/*
* drivers/i2c/chips/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/sched.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include "../iio.h"
#include "tsl2563.h"
#define DRIVER_NAME "tsl2563"
/* 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 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 iio_dev *indio_dev;
struct delayed_work poweroff_work;
/* Remember state for suspend and resume functions */
pm_message_t state;
struct tsl2563_gainlevel_coeff *gainlevel;
/* Thresholds are in lux */
u16 low_thres;
u16 high_thres;
u8 intr;
/* 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_write(struct i2c_client *client, u8 reg, u8 value)
{
int ret;
u8 buf[2];
buf[0] = TSL2563_CMD | reg;
buf[1] = value;
ret = i2c_master_send(client, buf, sizeof(buf));
return (ret == sizeof(buf)) ? 0 : ret;
}
static int tsl2563_read(struct i2c_client *client, u8 reg, void *buf, int len)
{
int ret;
u8 cmd = TSL2563_CMD | reg;
ret = i2c_master_send(client, &cmd, sizeof(cmd));
if (ret != sizeof(cmd))
return ret;
return i2c_master_recv(client, buf, len);
}
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 tsl2563_write(client, 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;
u8 val;
ret = tsl2563_read(client, TSL2563_REG_CTRL, &val, sizeof(val));
if (ret != sizeof(val))
return ret;
return (val & TSL2563_CTRL_POWER_MASK) == TSL2563_CMD_POWER_ON;
}
static int tsl2563_configure(struct tsl2563_chip *chip)
{
struct i2c_client *client = chip->client;
int ret;
ret = tsl2563_write(client, TSL2563_REG_TIMING,
chip->gainlevel->gaintime);
if (ret)
goto out;
ret = tsl2563_write(client, TSL2563_REG_INT, chip->intr);
out:
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 = tsl2563_read(client, TSL2563_REG_ID, id, sizeof(*id));
if (ret != sizeof(*id))
return 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 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 normalize_adc(u16 adc, u8 timing)
{
return adc << 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--;
tsl2563_write(client, 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;
u8 buf0[2], buf1[2];
u16 adc0, adc1;
int retry = 1;
int ret = 0;
if (chip->state.event != PM_EVENT_ON)
goto out;
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 = tsl2563_read(client,
TSL2563_REG_DATA0LOW | TSL2563_CLEARINT,
buf0, sizeof(buf0));
if (ret != sizeof(buf0))
goto out;
ret = tsl2563_read(client, TSL2563_REG_DATA1LOW,
buf1, sizeof(buf1));
if (ret != sizeof(buf1))
goto out;
adc0 = (buf0[1] << 8) + buf0[0];
adc1 = (buf1[1] << 8) + buf1[0];
retry = tsl2563_adjust_gainlevel(chip, adc0);
}
chip->data0 = normalize_adc(adc0, chip->gainlevel->gaintime);
chip->data1 = normalize_adc(adc1, chip->gainlevel->gaintime);
schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
ret = 0;
out:
return ret;
}
static inline int calib_to_sysfs(u32 calib)
{
return (int) (((calib * CALIB_BASE_SYSFS) +
CALIB_FRAC_HALF) >> CALIB_FRAC_BITS);
}
static inline u32 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 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);
}
/*--------------------------------------------------------------*/
/* Sysfs interface */
/*--------------------------------------------------------------*/
static ssize_t tsl2563_adc0_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2563_chip *chip = indio_dev->dev_data;
int ret;
mutex_lock(&chip->lock);
ret = tsl2563_get_adc(chip);
if (ret)
goto out;
ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data0);
out:
mutex_unlock(&chip->lock);
return ret;
}
static ssize_t tsl2563_adc1_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2563_chip *chip = indio_dev->dev_data;
int ret;
mutex_lock(&chip->lock);
ret = tsl2563_get_adc(chip);
if (ret)
goto out;
ret = snprintf(buf, PAGE_SIZE, "%d\n", chip->data1);
out:
mutex_unlock(&chip->lock);
return ret;
}
/* Apply calibration coefficient to ADC count. */
static u32 calib_adc(u32 adc, u32 calib)
{
unsigned long scaled = adc;
scaled *= calib;
scaled >>= CALIB_FRAC_BITS;
return (u32) scaled;
}
static ssize_t tsl2563_lux_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2563_chip *chip = indio_dev->dev_data;
u32 calib0, calib1;
int ret;
mutex_lock(&chip->lock);
ret = tsl2563_get_adc(chip);
if (ret)
goto out;
calib0 = calib_adc(chip->data0, chip->calib0) * chip->cover_comp_gain;
calib1 = calib_adc(chip->data1, chip->calib1) * chip->cover_comp_gain;
ret = snprintf(buf, PAGE_SIZE, "%d\n", adc_to_lux(calib0, calib1));
out:
mutex_unlock(&chip->lock);
return ret;
}
static ssize_t format_calib(char *buf, int len, u32 calib)
{
return snprintf(buf, PAGE_SIZE, "%d\n", calib_to_sysfs(calib));
}
static ssize_t tsl2563_calib0_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2563_chip *chip = indio_dev->dev_data;
int ret;
mutex_lock(&chip->lock);
ret = format_calib(buf, PAGE_SIZE, chip->calib0);
mutex_unlock(&chip->lock);
return ret;
}
static ssize_t tsl2563_calib1_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2563_chip *chip = indio_dev->dev_data;
int ret;
mutex_lock(&chip->lock);
ret = format_calib(buf, PAGE_SIZE, chip->calib1);
mutex_unlock(&chip->lock);
return ret;
}
static int do_calib_store(struct device *dev, const char *buf, size_t len,
int ch)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2563_chip *chip = indio_dev->dev_data;
int value;
u32 calib;
if (1 != sscanf(buf, "%d", &value))
return -EINVAL;
calib = calib_from_sysfs(value);
if (ch)
chip->calib1 = calib;
else
chip->calib0 = calib;
return len;
}
static ssize_t tsl2563_calib0_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
return do_calib_store(dev, buf, len, 0);
}
static ssize_t tsl2563_calib1_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
return do_calib_store(dev, buf, len, 1);
}
/* AmitXXXX: Convert to IIO_DEV_ATTR_LIGHT* as in tsl2561
* once I understand what they mean */
static DEVICE_ATTR(adc0, S_IRUGO, tsl2563_adc0_show, NULL);
static DEVICE_ATTR(adc1, S_IRUGO, tsl2563_adc1_show, NULL);
static DEVICE_ATTR(lux, S_IRUGO, tsl2563_lux_show, NULL);
static DEVICE_ATTR(calib0, S_IRUGO | S_IWUSR,
tsl2563_calib0_show, tsl2563_calib0_store);
static DEVICE_ATTR(calib1, S_IRUGO | S_IWUSR,
tsl2563_calib1_show, tsl2563_calib1_store);
static struct attribute *tsl2563_attributes[] = {
&dev_attr_adc0.attr,
&dev_attr_adc1.attr,
&dev_attr_lux.attr,
&dev_attr_calib0.attr,
&dev_attr_calib1.attr,
NULL
};
static const struct attribute_group tsl2563_group = {
.attrs = tsl2563_attributes,
};
/*--------------------------------------------------------------*/
/* Probe, Attach, Remove */
/*--------------------------------------------------------------*/
static struct i2c_driver tsl2563_i2c_driver;
static int __devinit tsl2563_probe(struct i2c_client *client,
const struct i2c_device_id *device_id)
{
struct tsl2563_chip *chip;
struct tsl2563_platform_data *pdata = client->dev.platform_data;
int err = 0;
int ret;
u8 id;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
i2c_set_clientdata(client, chip);
chip->client = client;
err = tsl2563_detect(chip);
if (err) {
dev_err(&client->dev, "device not found, error %d \n", -err);
goto fail1;
}
err = tsl2563_read_id(chip, &id);
if (err)
goto fail1;
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 = calib_from_sysfs(CALIB_BASE_SYSFS);
chip->calib1 = calib_from_sysfs(CALIB_BASE_SYSFS);
if (pdata)
chip->cover_comp_gain = pdata->cover_comp_gain;
else
chip->cover_comp_gain = 1;
dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
chip->indio_dev = iio_allocate_device();
if (!chip->indio_dev)
goto fail1;
chip->indio_dev->attrs = &tsl2563_group;
chip->indio_dev->dev.parent = &client->dev;
chip->indio_dev->dev_data = (void *)(chip);
chip->indio_dev->driver_module = THIS_MODULE;
chip->indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(chip->indio_dev);
if (ret)
goto fail1;
err = tsl2563_configure(chip);
if (err)
goto fail2;
INIT_DELAYED_WORK(&chip->poweroff_work, tsl2563_poweroff_work);
schedule_delayed_work(&chip->poweroff_work, 5 * HZ);
return 0;
fail2:
iio_device_unregister(chip->indio_dev);
fail1:
kfree(chip);
return err;
}
static int tsl2563_remove(struct i2c_client *client)
{
struct tsl2563_chip *chip = i2c_get_clientdata(client);
iio_device_unregister(chip->indio_dev);
kfree(chip);
return 0;
}
static int tsl2563_suspend(struct i2c_client *client, pm_message_t state)
{
struct tsl2563_chip *chip = i2c_get_clientdata(client);
int ret;
mutex_lock(&chip->lock);
ret = tsl2563_set_power(chip, 0);
if (ret)
goto out;
chip->state = state;
out:
mutex_unlock(&chip->lock);
return ret;
}
static int tsl2563_resume(struct i2c_client *client)
{
struct tsl2563_chip *chip = i2c_get_clientdata(client);
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->state.event = PM_EVENT_ON;
out:
mutex_unlock(&chip->lock);
return ret;
}
static const struct i2c_device_id tsl2563_id[] = {
{ DRIVER_NAME, 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tsl2563_id);
static struct i2c_driver tsl2563_i2c_driver = {
.driver = {
.name = DRIVER_NAME,
},
.suspend = tsl2563_suspend,
.resume = tsl2563_resume,
.probe = tsl2563_probe,
.remove = __devexit_p(tsl2563_remove),
.id_table = tsl2563_id,
};
static int __init tsl2563_init(void)
{
return i2c_add_driver(&tsl2563_i2c_driver);
}
static void __exit tsl2563_exit(void)
{
i2c_del_driver(&tsl2563_i2c_driver);
}
MODULE_AUTHOR("Nokia Corporation");
MODULE_DESCRIPTION("tsl2563 light sensor driver");
MODULE_LICENSE("GPL");
module_init(tsl2563_init);
module_exit(tsl2563_exit);

9
drivers/staging/iio/light/tsl2563.h Normal file
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@ -0,0 +1,9 @@
#ifndef __LINUX_TSL2563_H
#define __LINUX_TSL2563_H
struct tsl2563_platform_data {
int cover_comp_gain;
};
#endif /* __LINUX_TSL2563_H */