/*
* Device driver for monitoring ambient light intensity (lux)
* within the TAOS tsl258x family of devices (tsl2580, tsl2581).
*
* Copyright (c) 2011, TAOS Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#define TSL258X_MAX_DEVICE_REGS 32
/* Triton register offsets */
#define TSL258X_REG_MAX 8
/* Device Registers and Masks */
#define TSL258X_CNTRL 0x00
#define TSL258X_ALS_TIME 0X01
#define TSL258X_INTERRUPT 0x02
#define TSL258X_GAIN 0x07
#define TSL258X_REVID 0x11
#define TSL258X_CHIPID 0x12
#define TSL258X_ALS_CHAN0LO 0x14
#define TSL258X_ALS_CHAN0HI 0x15
#define TSL258X_ALS_CHAN1LO 0x16
#define TSL258X_ALS_CHAN1HI 0x17
#define TSL258X_TMR_LO 0x18
#define TSL258X_TMR_HI 0x19
/* tsl2583 cmd reg masks */
#define TSL258X_CMD_REG 0x80
#define TSL258X_CMD_SPL_FN 0x60
#define TSL258X_CMD_ALS_INT_CLR 0X01
/* tsl2583 cntrl reg masks */
#define TSL258X_CNTL_ADC_ENBL 0x02
#define TSL258X_CNTL_PWR_ON 0x01
/* tsl2583 status reg masks */
#define TSL258X_STA_ADC_VALID 0x01
#define TSL258X_STA_ADC_INTR 0x10
/* Lux calculation constants */
#define TSL258X_LUX_CALC_OVER_FLOW 65535
enum {
TSL258X_CHIP_UNKNOWN = 0,
TSL258X_CHIP_WORKING = 1,
TSL258X_CHIP_SUSPENDED = 2
};
/* Per-device data */
struct taos_als_info {
u16 als_ch0;
u16 als_ch1;
u16 lux;
};
struct taos_settings {
int als_time;
int als_gain;
int als_gain_trim;
int als_cal_target;
};
struct tsl2583_chip {
struct mutex als_mutex;
struct i2c_client *client;
struct taos_als_info als_cur_info;
struct taos_settings taos_settings;
int als_time_scale;
int als_saturation;
int taos_chip_status;
u8 taos_config[8];
};
/*
* Initial values for device - this values can/will be changed by driver.
* and applications as needed.
* These values are dynamic.
*/
static const u8 taos_config[8] = {
0x00, 0xee, 0x00, 0x03, 0x00, 0xFF, 0xFF, 0x00
}; /* cntrl atime intC Athl0 Athl1 Athh0 Athh1 gain */
struct taos_lux {
unsigned int ratio;
unsigned int ch0;
unsigned int ch1;
};
/* This structure is intentionally large to accommodate updates via sysfs. */
/* Sized to 11 = max 10 segments + 1 termination segment */
/* Assumption is one and only one type of glass used */
static struct taos_lux taos_device_lux[11] = {
{ 9830, 8520, 15729 },
{ 12452, 10807, 23344 },
{ 14746, 6383, 11705 },
{ 17695, 4063, 6554 },
};
struct gainadj {
s16 ch0;
s16 ch1;
};
/* Index = (0 - 3) Used to validate the gain selection index */
static const struct gainadj gainadj[] = {
{ 1, 1 },
{ 8, 8 },
{ 16, 16 },
{ 107, 115 }
};
/*
* Provides initial operational parameter defaults.
* These defaults may be changed through the device's sysfs files.
*/
static void taos_defaults(struct tsl2583_chip *chip)
{
/* Operational parameters */
chip->taos_settings.als_time = 100;
/* must be a multiple of 50mS */
chip->taos_settings.als_gain = 0;
/* this is actually an index into the gain table */
/* assume clear glass as default */
chip->taos_settings.als_gain_trim = 1000;
/* default gain trim to account for aperture effects */
chip->taos_settings.als_cal_target = 130;
/* Known external ALS reading used for calibration */
}
/*
* Read a number of bytes starting at register (reg) location.
* Return 0, or i2c_smbus_write_byte ERROR code.
*/
static int
taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len)
{
int i, ret;
for (i = 0; i < len; i++) {
/* select register to write */
ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | reg));
if (ret < 0) {
dev_err(&client->dev, "taos_i2c_read failed to write"
" register %x\n", reg);
return ret;
}
/* read the data */
*val = i2c_smbus_read_byte(client);
val++;
reg++;
}
return 0;
}
/*
* Reads and calculates current lux value.
* The raw ch0 and ch1 values of the ambient light sensed in the last
* integration cycle are read from the device.
* Time scale factor array values are adjusted based on the integration time.
* The raw values are multiplied by a scale factor, and device gain is obtained
* using gain index. Limit checks are done next, then the ratio of a multiple
* of ch1 value, to the ch0 value, is calculated. The array taos_device_lux[]
* declared above is then scanned to find the first ratio value that is just
* above the ratio we just calculated. The ch0 and ch1 multiplier constants in
* the array are then used along with the time scale factor array values, to
* calculate the lux.
*/
static int taos_get_lux(struct iio_dev *indio_dev)
{
u16 ch0, ch1; /* separated ch0/ch1 data from device */
u32 lux; /* raw lux calculated from device data */
u64 lux64;
u32 ratio;
u8 buf[5];
struct taos_lux *p;
struct tsl2583_chip *chip = iio_priv(indio_dev);
int i, ret;
u32 ch0lux = 0;
u32 ch1lux = 0;
if (mutex_trylock(&chip->als_mutex) == 0) {
dev_info(&chip->client->dev, "taos_get_lux device is busy\n");
return chip->als_cur_info.lux; /* busy, so return LAST VALUE */
}
if (chip->taos_chip_status != TSL258X_CHIP_WORKING) {
/* device is not enabled */
dev_err(&chip->client->dev, "taos_get_lux device is not enabled\n");
ret = -EBUSY ;
goto out_unlock;
}
ret = taos_i2c_read(chip->client, (TSL258X_CMD_REG), &buf[0], 1);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_get_lux failed to read CMD_REG\n");
goto out_unlock;
}
/* is data new & valid */
if (!(buf[0] & TSL258X_STA_ADC_INTR)) {
dev_err(&chip->client->dev, "taos_get_lux data not valid\n");
ret = chip->als_cur_info.lux; /* return LAST VALUE */
goto out_unlock;
}
for (i = 0; i < 4; i++) {
int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i);
ret = taos_i2c_read(chip->client, reg, &buf[i], 1);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_get_lux failed to read"
" register %x\n", reg);
goto out_unlock;
}
}
/* clear status, really interrupt status (interrupts are off), but
* we use the bit anyway - don't forget 0x80 - this is a command*/
ret = i2c_smbus_write_byte(chip->client,
(TSL258X_CMD_REG | TSL258X_CMD_SPL_FN |
TSL258X_CMD_ALS_INT_CLR));
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_i2c_write_command failed in taos_get_lux, err = %d\n",
ret);
goto out_unlock; /* have no data, so return failure */
}
/* extract ALS/lux data */
ch0 = le16_to_cpup((const __le16 *)&buf[0]);
ch1 = le16_to_cpup((const __le16 *)&buf[2]);
chip->als_cur_info.als_ch0 = ch0;
chip->als_cur_info.als_ch1 = ch1;
if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
goto return_max;
if (ch0 == 0) {
/* have no data, so return LAST VALUE */
ret = chip->als_cur_info.lux = 0;
goto out_unlock;
}
/* calculate ratio */
ratio = (ch1 << 15) / ch0;
/* convert to unscaled lux using the pointer to the table */
for (p = (struct taos_lux *) taos_device_lux;
p->ratio != 0 && p->ratio < ratio; p++)
;
if (p->ratio == 0) {
lux = 0;
} else {
ch0lux = ((ch0 * p->ch0) +
(gainadj[chip->taos_settings.als_gain].ch0 >> 1))
/ gainadj[chip->taos_settings.als_gain].ch0;
ch1lux = ((ch1 * p->ch1) +
(gainadj[chip->taos_settings.als_gain].ch1 >> 1))
/ gainadj[chip->taos_settings.als_gain].ch1;
lux = ch0lux - ch1lux;
}
/* note: lux is 31 bit max at this point */
if (ch1lux > ch0lux) {
dev_dbg(&chip->client->dev, "No Data - Return last value\n");
ret = chip->als_cur_info.lux = 0;
goto out_unlock;
}
/* adjust for active time scale */
if (chip->als_time_scale == 0)
lux = 0;
else
lux = (lux + (chip->als_time_scale >> 1)) /
chip->als_time_scale;
/* Adjust for active gain scale.
* The taos_device_lux tables above have a factor of 8192 built in,
* so we need to shift right.
* User-specified gain provides a multiplier.
* Apply user-specified gain before shifting right to retain precision.
* Use 64 bits to avoid overflow on multiplication.
* Then go back to 32 bits before division to avoid using div_u64().
*/
lux64 = lux;
lux64 = lux64 * chip->taos_settings.als_gain_trim;
lux64 >>= 13;
lux = lux64;
lux = (lux + 500) / 1000;
if (lux > TSL258X_LUX_CALC_OVER_FLOW) { /* check for overflow */
return_max:
lux = TSL258X_LUX_CALC_OVER_FLOW;
}
/* Update the structure with the latest VALID lux. */
chip->als_cur_info.lux = lux;
ret = lux;
out_unlock:
mutex_unlock(&chip->als_mutex);
return ret;
}
/*
* Obtain single reading and calculate the als_gain_trim (later used
* to derive actual lux).
* Return updated gain_trim value.
*/
static int taos_als_calibrate(struct iio_dev *indio_dev)
{
struct tsl2583_chip *chip = iio_priv(indio_dev);
u8 reg_val;
unsigned int gain_trim_val;
int ret;
int lux_val;
ret = i2c_smbus_write_byte(chip->client,
(TSL258X_CMD_REG | TSL258X_CNTRL));
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed to reach the CNTRL register, ret=%d\n",
ret);
return ret;
}
reg_val = i2c_smbus_read_byte(chip->client);
if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON))
!= (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWR_ON)) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed: device not powered on with ADC enabled\n");
return -1;
}
ret = i2c_smbus_write_byte(chip->client,
(TSL258X_CMD_REG | TSL258X_CNTRL));
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed to reach the STATUS register, ret=%d\n",
ret);
return ret;
}
reg_val = i2c_smbus_read_byte(chip->client);
if ((reg_val & TSL258X_STA_ADC_VALID) != TSL258X_STA_ADC_VALID) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed: STATUS - ADC not valid.\n");
return -ENODATA;
}
lux_val = taos_get_lux(indio_dev);
if (lux_val < 0) {
dev_err(&chip->client->dev, "taos_als_calibrate failed to get lux\n");
return lux_val;
}
gain_trim_val = (unsigned int) (((chip->taos_settings.als_cal_target)
* chip->taos_settings.als_gain_trim) / lux_val);
if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
dev_err(&chip->client->dev,
"taos_als_calibrate failed: trim_val of %d is out of range\n",
gain_trim_val);
return -ENODATA;
}
chip->taos_settings.als_gain_trim = (int) gain_trim_val;
return (int) gain_trim_val;
}
/*
* Turn the device on.
* Configuration must be set before calling this function.
*/
static int taos_chip_on(struct iio_dev *indio_dev)
{
int i;
int ret;
u8 *uP;
u8 utmp;
int als_count;
int als_time;
struct tsl2583_chip *chip = iio_priv(indio_dev);
/* and make sure we're not already on */
if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
/* if forcing a register update - turn off, then on */
dev_info(&chip->client->dev, "device is already enabled\n");
return -EINVAL;
}
/* determine als integration register */
als_count = (chip->taos_settings.als_time * 100 + 135) / 270;
if (als_count == 0)
als_count = 1; /* ensure at least one cycle */
/* convert back to time (encompasses overrides) */
als_time = (als_count * 27 + 5) / 10;
chip->taos_config[TSL258X_ALS_TIME] = 256 - als_count;
/* Set the gain based on taos_settings struct */
chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain;
/* set chip struct re scaling and saturation */
chip->als_saturation = als_count * 922; /* 90% of full scale */
chip->als_time_scale = (als_time + 25) / 50;
/* TSL258x Specific power-on / adc enable sequence
* Power on the device 1st. */
utmp = TSL258X_CNTL_PWR_ON;
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL, utmp);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_chip_on failed on CNTRL reg.\n");
return -1;
}
/* Use the following shadow copy for our delay before enabling ADC.
* Write all the registers. */
for (i = 0, uP = chip->taos_config; i < TSL258X_REG_MAX; i++) {
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG + i,
*uP++);
if (ret < 0) {
dev_err(&chip->client->dev,
"taos_chip_on failed on reg %d.\n", i);
return -1;
}
}
msleep(3);
/* NOW enable the ADC
* initialize the desired mode of operation */
utmp = TSL258X_CNTL_PWR_ON | TSL258X_CNTL_ADC_ENBL;
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL,
utmp);
if (ret < 0) {
dev_err(&chip->client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
return -1;
}
chip->taos_chip_status = TSL258X_CHIP_WORKING;
return ret;
}
static int taos_chip_off(struct iio_dev *indio_dev)
{
struct tsl2583_chip *chip = iio_priv(indio_dev);
int ret;
/* turn device off */
chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
ret = i2c_smbus_write_byte_data(chip->client,
TSL258X_CMD_REG | TSL258X_CNTRL,
0x00);
return ret;
}
/* Sysfs Interface Functions */
static ssize_t taos_power_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_chip_status);
}
static ssize_t taos_power_state_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value == 0)
taos_chip_off(indio_dev);
else
taos_chip_on(indio_dev);
return len;
}
static ssize_t taos_gain_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
char gain[4] = {0};
switch (chip->taos_settings.als_gain) {
case 0:
strcpy(gain, "001");
break;
case 1:
strcpy(gain, "008");
break;
case 2:
strcpy(gain, "016");
break;
case 3:
strcpy(gain, "111");
break;
}
return sprintf(buf, "%s\n", gain);
}
static ssize_t taos_gain_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
switch (value) {
case 1:
chip->taos_settings.als_gain = 0;
break;
case 8:
chip->taos_settings.als_gain = 1;
break;
case 16:
chip->taos_settings.als_gain = 2;
break;
case 111:
chip->taos_settings.als_gain = 3;
break;
default:
dev_err(dev, "Invalid Gain Index (must be 1,8,16,111)\n");
return -1;
}
return len;
}
static ssize_t taos_gain_available_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n", "1 8 16 111");
}
static ssize_t taos_als_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_settings.als_time);
}
static ssize_t taos_als_time_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if ((value < 50) || (value > 650))
return -EINVAL;
if (value % 50)
return -EINVAL;
chip->taos_settings.als_time = value;
return len;
}
static ssize_t taos_als_time_available_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n",
"50 100 150 200 250 300 350 400 450 500 550 600 650");
}
static ssize_t taos_als_trim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim);
}
static ssize_t taos_als_trim_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value)
chip->taos_settings.als_gain_trim = value;
return len;
}
static ssize_t taos_als_cal_target_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target);
}
static ssize_t taos_als_cal_target_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value)
chip->taos_settings.als_cal_target = value;
return len;
}
static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
int ret;
ret = taos_get_lux(dev_to_iio_dev(dev));
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", ret);
}
static ssize_t taos_do_calibrate(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value == 1)
taos_als_calibrate(indio_dev);
return len;
}
static ssize_t taos_luxtable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int i;
int offset = 0;
for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) {
offset += sprintf(buf + offset, "%d,%d,%d,",
taos_device_lux[i].ratio,
taos_device_lux[i].ch0,
taos_device_lux[i].ch1);
if (taos_device_lux[i].ratio == 0) {
/* We just printed the first "0" entry.
* Now get rid of the extra "," and break. */
offset--;
break;
}
}
offset += sprintf(buf + offset, "\n");
return offset;
}
static ssize_t taos_luxtable_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2583_chip *chip = iio_priv(indio_dev);
int value[ARRAY_SIZE(taos_device_lux)*3 + 1];
int n;
get_options(buf, ARRAY_SIZE(value), value);
/* We now have an array of ints starting at value[1], and
* enumerated by value[0].
* We expect each group of three ints is one table entry,
* and the last table entry is all 0.
*/
n = value[0];
if ((n % 3) || n < 6 || n > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) {
dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n);
return -EINVAL;
}
if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) {
dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n);
return -EINVAL;
}
if (chip->taos_chip_status == TSL258X_CHIP_WORKING)
taos_chip_off(indio_dev);
/* Zero out the table */
memset(taos_device_lux, 0, sizeof(taos_device_lux));
memcpy(taos_device_lux, &value[1], (value[0] * 4));
taos_chip_on(indio_dev);
return len;
}
static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
taos_power_state_show, taos_power_state_store);
static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
taos_gain_show, taos_gain_store);
static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO,
taos_gain_available_show, NULL);
static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR,
taos_als_time_show, taos_als_time_store);
static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO,
taos_als_time_available_show, NULL);
static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR,
taos_als_trim_show, taos_als_trim_store);
static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR,
taos_als_cal_target_show, taos_als_cal_target_store);
static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL);
static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate);
static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR,
taos_luxtable_show, taos_luxtable_store);
static struct attribute *sysfs_attrs_ctrl[] = {
&dev_attr_power_state.attr,
&dev_attr_illuminance0_calibscale.attr, /* Gain */
&dev_attr_illuminance0_calibscale_available.attr,
&dev_attr_illuminance0_integration_time.attr, /* I time*/
&dev_attr_illuminance0_integration_time_available.attr,
&dev_attr_illuminance0_calibbias.attr, /* trim */
&dev_attr_illuminance0_input_target.attr,
&dev_attr_illuminance0_input.attr,
&dev_attr_illuminance0_calibrate.attr,
&dev_attr_illuminance0_lux_table.attr,
NULL
};
static struct attribute_group tsl2583_attribute_group = {
.attrs = sysfs_attrs_ctrl,
};
/* Use the default register values to identify the Taos device */
static int taos_tsl258x_device(unsigned char *bufp)
{
return ((bufp[TSL258X_CHIPID] & 0xf0) == 0x90);
}
static const struct iio_info tsl2583_info = {
.attrs = &tsl2583_attribute_group,
.driver_module = THIS_MODULE,
};
/*
* Client probe function - When a valid device is found, the driver's device
* data structure is updated, and initialization completes successfully.
*/
static int taos_probe(struct i2c_client *clientp,
const struct i2c_device_id *idp)
{
int i, ret;
unsigned char buf[TSL258X_MAX_DEVICE_REGS];
struct tsl2583_chip *chip;
struct iio_dev *indio_dev;
if (!i2c_check_functionality(clientp->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&clientp->dev,
"taos_probe() - i2c smbus byte data "
"functions unsupported\n");
return -EOPNOTSUPP;
}
indio_dev = iio_device_alloc(sizeof(*chip));
if (indio_dev == NULL) {
ret = -ENOMEM;
dev_err(&clientp->dev, "iio allocation failed\n");
goto fail1;
}
chip = iio_priv(indio_dev);
chip->client = clientp;
i2c_set_clientdata(clientp, indio_dev);
mutex_init(&chip->als_mutex);
chip->taos_chip_status = TSL258X_CHIP_UNKNOWN;
memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config));
for (i = 0; i < TSL258X_MAX_DEVICE_REGS; i++) {
ret = i2c_smbus_write_byte(clientp,
(TSL258X_CMD_REG | (TSL258X_CNTRL + i)));
if (ret < 0) {
dev_err(&clientp->dev, "i2c_smbus_write_bytes() to cmd "
"reg failed in taos_probe(), err = %d\n", ret);
goto fail2;
}
ret = i2c_smbus_read_byte(clientp);
if (ret < 0) {
dev_err(&clientp->dev, "i2c_smbus_read_byte from "
"reg failed in taos_probe(), err = %d\n", ret);
goto fail2;
}
buf[i] = ret;
}
if (!taos_tsl258x_device(buf)) {
dev_info(&clientp->dev, "i2c device found but does not match "
"expected id in taos_probe()\n");
goto fail2;
}
ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_CNTRL));
if (ret < 0) {
dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd reg "
"failed in taos_probe(), err = %d\n", ret);
goto fail2;
}
indio_dev->info = &tsl2583_info;
indio_dev->dev.parent = &clientp->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->name = chip->client->name;
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&clientp->dev, "iio registration failed\n");
goto fail2;
}
/* Load up the V2 defaults (these are hard coded defaults for now) */
taos_defaults(chip);
/* Make sure the chip is on */
taos_chip_on(indio_dev);
dev_info(&clientp->dev, "Light sensor found.\n");
return 0;
fail1:
iio_device_free(indio_dev);
fail2:
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int taos_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct tsl2583_chip *chip = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&chip->als_mutex);
if (chip->taos_chip_status == TSL258X_CHIP_WORKING) {
ret = taos_chip_off(indio_dev);
chip->taos_chip_status = TSL258X_CHIP_SUSPENDED;
}
mutex_unlock(&chip->als_mutex);
return ret;
}
static int taos_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct tsl2583_chip *chip = iio_priv(indio_dev);
int ret = 0;
mutex_lock(&chip->als_mutex);
if (chip->taos_chip_status == TSL258X_CHIP_SUSPENDED)
ret = taos_chip_on(indio_dev);
mutex_unlock(&chip->als_mutex);
return ret;
}
static SIMPLE_DEV_PM_OPS(taos_pm_ops, taos_suspend, taos_resume);
#define TAOS_PM_OPS (&taos_pm_ops)
#else
#define TAOS_PM_OPS NULL
#endif
static int taos_remove(struct i2c_client *client)
{
iio_device_unregister(i2c_get_clientdata(client));
iio_device_free(i2c_get_clientdata(client));
return 0;
}
static struct i2c_device_id taos_idtable[] = {
{ "tsl2580", 0 },
{ "tsl2581", 1 },
{ "tsl2583", 2 },
{}
};
MODULE_DEVICE_TABLE(i2c, taos_idtable);
/* Driver definition */
static struct i2c_driver taos_driver = {
.driver = {
.name = "tsl2583",
.pm = TAOS_PM_OPS,
},
.id_table = taos_idtable,
.probe = taos_probe,
.remove = taos_remove,
};
module_i2c_driver(taos_driver);
MODULE_AUTHOR("J. August Brenner<jbrenner@taosinc.com>");
MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
MODULE_LICENSE("GPL");