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tegrakernel/kernel/kernel-4.9/drivers/iio/light/si1145.c

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initial commit tegra kernel 32.6.1
2022-02-16 09:13:02 -06:00
/*
* si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient
* light, UV index and proximity sensors
*
* Copyright 2014-16 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
* Copyright 2016 Crestez Dan Leonard <leonard.crestez@intel.com>
*
* 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.
*
* SI1132 (7-bit I2C slave address 0x60)
* SI1141/2/3 (7-bit I2C slave address 0x5a)
* SI1145/6/6 (7-bit I2C slave address 0x60)
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/buffer.h>
#include <linux/util_macros.h>
#define SI1145_REG_PART_ID 0x00
#define SI1145_REG_REV_ID 0x01
#define SI1145_REG_SEQ_ID 0x02
#define SI1145_REG_INT_CFG 0x03
#define SI1145_REG_IRQ_ENABLE 0x04
#define SI1145_REG_IRQ_MODE 0x05
#define SI1145_REG_HW_KEY 0x07
#define SI1145_REG_MEAS_RATE 0x08
#define SI1145_REG_PS_LED21 0x0f
#define SI1145_REG_PS_LED3 0x10
#define SI1145_REG_UCOEF1 0x13
#define SI1145_REG_UCOEF2 0x14
#define SI1145_REG_UCOEF3 0x15
#define SI1145_REG_UCOEF4 0x16
#define SI1145_REG_PARAM_WR 0x17
#define SI1145_REG_COMMAND 0x18
#define SI1145_REG_RESPONSE 0x20
#define SI1145_REG_IRQ_STATUS 0x21
#define SI1145_REG_ALSVIS_DATA 0x22
#define SI1145_REG_ALSIR_DATA 0x24
#define SI1145_REG_PS1_DATA 0x26
#define SI1145_REG_PS2_DATA 0x28
#define SI1145_REG_PS3_DATA 0x2a
#define SI1145_REG_AUX_DATA 0x2c
#define SI1145_REG_PARAM_RD 0x2e
#define SI1145_REG_CHIP_STAT 0x30
#define SI1145_UCOEF1_DEFAULT 0x7b
#define SI1145_UCOEF2_DEFAULT 0x6b
#define SI1145_UCOEF3_DEFAULT 0x01
#define SI1145_UCOEF4_DEFAULT 0x00
/* Helper to figure out PS_LED register / shift per channel */
#define SI1145_PS_LED_REG(ch) \
(((ch) == 2) ? SI1145_REG_PS_LED3 : SI1145_REG_PS_LED21)
#define SI1145_PS_LED_SHIFT(ch) \
(((ch) == 1) ? 4 : 0)
/* Parameter offsets */
#define SI1145_PARAM_CHLIST 0x01
#define SI1145_PARAM_PSLED12_SELECT 0x02
#define SI1145_PARAM_PSLED3_SELECT 0x03
#define SI1145_PARAM_PS_ENCODING 0x05
#define SI1145_PARAM_ALS_ENCODING 0x06
#define SI1145_PARAM_PS1_ADC_MUX 0x07
#define SI1145_PARAM_PS2_ADC_MUX 0x08
#define SI1145_PARAM_PS3_ADC_MUX 0x09
#define SI1145_PARAM_PS_ADC_COUNTER 0x0a
#define SI1145_PARAM_PS_ADC_GAIN 0x0b
#define SI1145_PARAM_PS_ADC_MISC 0x0c
#define SI1145_PARAM_ALS_ADC_MUX 0x0d
#define SI1145_PARAM_ALSIR_ADC_MUX 0x0e
#define SI1145_PARAM_AUX_ADC_MUX 0x0f
#define SI1145_PARAM_ALSVIS_ADC_COUNTER 0x10
#define SI1145_PARAM_ALSVIS_ADC_GAIN 0x11
#define SI1145_PARAM_ALSVIS_ADC_MISC 0x12
#define SI1145_PARAM_LED_RECOVERY 0x1c
#define SI1145_PARAM_ALSIR_ADC_COUNTER 0x1d
#define SI1145_PARAM_ALSIR_ADC_GAIN 0x1e
#define SI1145_PARAM_ALSIR_ADC_MISC 0x1f
#define SI1145_PARAM_ADC_OFFSET 0x1a
/* Channel enable masks for CHLIST parameter */
#define SI1145_CHLIST_EN_PS1 BIT(0)
#define SI1145_CHLIST_EN_PS2 BIT(1)
#define SI1145_CHLIST_EN_PS3 BIT(2)
#define SI1145_CHLIST_EN_ALSVIS BIT(4)
#define SI1145_CHLIST_EN_ALSIR BIT(5)
#define SI1145_CHLIST_EN_AUX BIT(6)
#define SI1145_CHLIST_EN_UV BIT(7)
/* Proximity measurement mode for ADC_MISC parameter */
#define SI1145_PS_ADC_MODE_NORMAL BIT(2)
/* Signal range mask for ADC_MISC parameter */
#define SI1145_ADC_MISC_RANGE BIT(5)
/* Commands for REG_COMMAND */
#define SI1145_CMD_NOP 0x00
#define SI1145_CMD_RESET 0x01
#define SI1145_CMD_PS_FORCE 0x05
#define SI1145_CMD_ALS_FORCE 0x06
#define SI1145_CMD_PSALS_FORCE 0x07
#define SI1145_CMD_PS_PAUSE 0x09
#define SI1145_CMD_ALS_PAUSE 0x0a
#define SI1145_CMD_PSALS_PAUSE 0x0b
#define SI1145_CMD_PS_AUTO 0x0d
#define SI1145_CMD_ALS_AUTO 0x0e
#define SI1145_CMD_PSALS_AUTO 0x0f
#define SI1145_CMD_PARAM_QUERY 0x80
#define SI1145_CMD_PARAM_SET 0xa0
#define SI1145_RSP_INVALID_SETTING 0x80
#define SI1145_RSP_COUNTER_MASK 0x0F
/* Minimum sleep after each command to ensure it's received */
#define SI1145_COMMAND_MINSLEEP_MS 5
/* Return -ETIMEDOUT after this long */
#define SI1145_COMMAND_TIMEOUT_MS 25
/* Interrupt configuration masks for INT_CFG register */
#define SI1145_INT_CFG_OE BIT(0) /* enable interrupt */
#define SI1145_INT_CFG_MODE BIT(1) /* auto reset interrupt pin */
/* Interrupt enable masks for IRQ_ENABLE register */
#define SI1145_MASK_ALL_IE (BIT(4) | BIT(3) | BIT(2) | BIT(0))
#define SI1145_MUX_TEMP 0x65
#define SI1145_MUX_VDD 0x75
/* Proximity LED current; see Table 2 in datasheet */
#define SI1145_LED_CURRENT_45mA 0x04
enum {
SI1132,
SI1141,
SI1142,
SI1143,
SI1145,
SI1146,
SI1147,
};
struct si1145_part_info {
u8 part;
const struct iio_info *iio_info;
const struct iio_chan_spec *channels;
unsigned int num_channels;
unsigned int num_leds;
bool uncompressed_meas_rate;
};
/**
* struct si1145_data - si1145 chip state data
* @client: I2C client
* @lock: mutex to protect shared state.
* @cmdlock: Low-level mutex to protect command execution only
* @rsp_seq: Next expected response number or -1 if counter reset required
* @scan_mask: Saved scan mask to avoid duplicate set_chlist
* @autonomous: If automatic measurements are active (for buffer support)
* @part_info: Part information
* @trig: Pointer to iio trigger
* @meas_rate: Value of MEAS_RATE register. Only set in HW in auto mode
* @buffer: Used to pack data read from sensor.
*/
struct si1145_data {
struct i2c_client *client;
struct mutex lock;
struct mutex cmdlock;
int rsp_seq;
const struct si1145_part_info *part_info;
unsigned long scan_mask;
bool autonomous;
struct iio_trigger *trig;
int meas_rate;
/*
* Ensure timestamp will be naturally aligned if present.
* Maximum buffer size (may be only partly used if not all
* channels are enabled):
* 6*2 bytes channels data + 4 bytes alignment +
* 8 bytes timestamp
*/
u8 buffer[24] __aligned(8);
};
/**
* __si1145_command_reset() - Send CMD_NOP and wait for response 0
*
* Does not modify data->rsp_seq
*
* Return: 0 on success and -errno on error.
*/
static int __si1145_command_reset(struct si1145_data *data)
{
struct device *dev = &data->client->dev;
unsigned long stop_jiffies;
int ret;
ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND,
SI1145_CMD_NOP);
if (ret < 0)
return ret;
msleep(SI1145_COMMAND_MINSLEEP_MS);
stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
while (true) {
ret = i2c_smbus_read_byte_data(data->client,
SI1145_REG_RESPONSE);
if (ret <= 0)
return ret;
if (time_after(jiffies, stop_jiffies)) {
dev_warn(dev, "timeout on reset\n");
return -ETIMEDOUT;
}
msleep(SI1145_COMMAND_MINSLEEP_MS);
continue;
}
}
/**
* si1145_command() - Execute a command and poll the response register
*
* All conversion overflows are reported as -EOVERFLOW
* INVALID_SETTING is reported as -EINVAL
* Timeouts are reported as -ETIMEDOUT
*
* Return: 0 on success or -errno on failure
*/
static int si1145_command(struct si1145_data *data, u8 cmd)
{
struct device *dev = &data->client->dev;
unsigned long stop_jiffies;
int ret;
mutex_lock(&data->cmdlock);
if (data->rsp_seq < 0) {
ret = __si1145_command_reset(data);
if (ret < 0) {
dev_err(dev, "failed to reset command counter, ret=%d\n",
ret);
goto out;
}
data->rsp_seq = 0;
}
ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);
if (ret) {
dev_warn(dev, "failed to write command, ret=%d\n", ret);
goto out;
}
/* Sleep a little to ensure the command is received */
msleep(SI1145_COMMAND_MINSLEEP_MS);
stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
while (true) {
ret = i2c_smbus_read_byte_data(data->client,
SI1145_REG_RESPONSE);
if (ret < 0) {
dev_warn(dev, "failed to read response, ret=%d\n", ret);
break;
}
if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) {
if (ret == data->rsp_seq) {
if (time_after(jiffies, stop_jiffies)) {
dev_warn(dev, "timeout on command %#02hhx\n",
cmd);
ret = -ETIMEDOUT;
break;
}
msleep(SI1145_COMMAND_MINSLEEP_MS);
continue;
}
if (ret == ((data->rsp_seq + 1) &
SI1145_RSP_COUNTER_MASK)) {
data->rsp_seq = ret;
ret = 0;
break;
}
dev_warn(dev, "unexpected response counter %d instead of %d\n",
ret, (data->rsp_seq + 1) &
SI1145_RSP_COUNTER_MASK);
ret = -EIO;
} else {
if (ret == SI1145_RSP_INVALID_SETTING) {
dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n",
cmd);
ret = -EINVAL;
} else {
/* All overflows are treated identically */
dev_dbg(dev, "overflow, ret=%d, cmd=%#02hhx\n",
ret, cmd);
ret = -EOVERFLOW;
}
}
/* Force a counter reset next time */
data->rsp_seq = -1;
break;
}
out:
mutex_unlock(&data->cmdlock);
return ret;
}
static int si1145_param_update(struct si1145_data *data, u8 op, u8 param,
u8 value)
{
int ret;
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_PARAM_WR, value);
if (ret < 0)
return ret;
return si1145_command(data, op | (param & 0x1F));
}
static int si1145_param_set(struct si1145_data *data, u8 param, u8 value)
{
return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value);
}
/* Set param. Returns negative errno or current value */
static int si1145_param_query(struct si1145_data *data, u8 param)
{
int ret;
ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F));
if (ret < 0)
return ret;
return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD);
}
/* Expand 8 bit compressed value to 16 bit, see Silabs AN498 */
static u16 si1145_uncompress(u8 x)
{
u16 result = 0;
u8 exponent = 0;
if (x < 8)
return 0;
exponent = (x & 0xf0) >> 4;
result = 0x10 | (x & 0x0f);
if (exponent >= 4)
return result << (exponent - 4);
return result >> (4 - exponent);
}
/* Compress 16 bit value to 8 bit, see Silabs AN498 */
static u8 si1145_compress(u16 x)
{
u32 exponent = 0;
u32 significand = 0;
u32 tmp = x;
if (x == 0x0000)
return 0x00;
if (x == 0x0001)
return 0x08;
while (1) {
tmp >>= 1;
exponent += 1;
if (tmp == 1)
break;
}
if (exponent < 5) {
significand = x << (4 - exponent);
return (exponent << 4) | (significand & 0xF);
}
significand = x >> (exponent - 5);
if (significand & 1) {
significand += 2;
if (significand & 0x0040) {
exponent += 1;
significand >>= 1;
}
}
return (exponent << 4) | ((significand >> 1) & 0xF);
}
/* Write meas_rate in hardware */
static int si1145_set_meas_rate(struct si1145_data *data, int interval)
{
if (data->part_info->uncompressed_meas_rate)
return i2c_smbus_write_word_data(data->client,
SI1145_REG_MEAS_RATE, interval);
else
return i2c_smbus_write_byte_data(data->client,
SI1145_REG_MEAS_RATE, interval);
}
static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2)
{
*val = 32000;
if (data->part_info->uncompressed_meas_rate)
*val2 = data->meas_rate;
else
*val2 = si1145_uncompress(data->meas_rate);
return IIO_VAL_FRACTIONAL;
}
/* Set the samp freq in driver private data */
static int si1145_store_samp_freq(struct si1145_data *data, int val)
{
int ret = 0;
int meas_rate;
if (val <= 0 || val > 32000)
return -ERANGE;
meas_rate = 32000 / val;
mutex_lock(&data->lock);
if (data->autonomous) {
ret = si1145_set_meas_rate(data, meas_rate);
if (ret)
goto out;
}
if (data->part_info->uncompressed_meas_rate)
data->meas_rate = meas_rate;
else
data->meas_rate = si1145_compress(meas_rate);
out:
mutex_unlock(&data->lock);
return ret;
}
static irqreturn_t si1145_trigger_handler(int irq, void *private)
{
struct iio_poll_func *pf = private;
struct iio_dev *indio_dev = pf->indio_dev;
struct si1145_data *data = iio_priv(indio_dev);
int i, j = 0;
int ret;
u8 irq_status = 0;
if (!data->autonomous) {
ret = si1145_command(data, SI1145_CMD_PSALS_FORCE);
if (ret < 0 && ret != -EOVERFLOW)
goto done;
} else {
irq_status = ret = i2c_smbus_read_byte_data(data->client,
SI1145_REG_IRQ_STATUS);
if (ret < 0)
goto done;
if (!(irq_status & SI1145_MASK_ALL_IE))
goto done;
}
for_each_set_bit(i, indio_dev->active_scan_mask,
indio_dev->masklength) {
int run = 1;
while (i + run < indio_dev->masklength) {
if (!test_bit(i + run, indio_dev->active_scan_mask))
break;
if (indio_dev->channels[i + run].address !=
indio_dev->channels[i].address + 2 * run)
break;
run++;
}
ret = i2c_smbus_read_i2c_block_data_or_emulated(
data->client, indio_dev->channels[i].address,
sizeof(u16) * run, &data->buffer[j]);
if (ret < 0)
goto done;
j += run * sizeof(u16);
i += run - 1;
}
if (data->autonomous) {
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_IRQ_STATUS,
irq_status & SI1145_MASK_ALL_IE);
if (ret < 0)
goto done;
}
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
iio_get_time_ns(indio_dev));
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask)
{
struct si1145_data *data = iio_priv(indio_dev);
u8 reg = 0, mux;
int ret;
int i;
/* channel list already set, no need to reprogram */
if (data->scan_mask == scan_mask)
return 0;
for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
switch (indio_dev->channels[i].address) {
case SI1145_REG_ALSVIS_DATA:
reg |= SI1145_CHLIST_EN_ALSVIS;
break;
case SI1145_REG_ALSIR_DATA:
reg |= SI1145_CHLIST_EN_ALSIR;
break;
case SI1145_REG_PS1_DATA:
reg |= SI1145_CHLIST_EN_PS1;
break;
case SI1145_REG_PS2_DATA:
reg |= SI1145_CHLIST_EN_PS2;
break;
case SI1145_REG_PS3_DATA:
reg |= SI1145_CHLIST_EN_PS3;
break;
case SI1145_REG_AUX_DATA:
switch (indio_dev->channels[i].type) {
case IIO_UVINDEX:
reg |= SI1145_CHLIST_EN_UV;
break;
default:
reg |= SI1145_CHLIST_EN_AUX;
if (indio_dev->channels[i].type == IIO_TEMP)
mux = SI1145_MUX_TEMP;
else
mux = SI1145_MUX_VDD;
ret = si1145_param_set(data,
SI1145_PARAM_AUX_ADC_MUX, mux);
if (ret < 0)
return ret;
break;
}
}
}
data->scan_mask = scan_mask;
ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg);
return ret < 0 ? ret : 0;
}
static int si1145_measure(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan)
{
struct si1145_data *data = iio_priv(indio_dev);
u8 cmd;
int ret;
ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index));
if (ret < 0)
return ret;
cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE :
SI1145_CMD_ALS_FORCE;
ret = si1145_command(data, cmd);
if (ret < 0 && ret != -EOVERFLOW)
return ret;
return i2c_smbus_read_word_data(data->client, chan->address);
}
/*
* Conversion between iio scale and ADC_GAIN values
* These could be further adjusted but proximity/intensity are dimensionless
*/
static const int si1145_proximity_scale_available[] = {
128, 64, 32, 16, 8, 4};
static const int si1145_intensity_scale_available[] = {
128, 64, 32, 16, 8, 4, 2, 1};
static IIO_CONST_ATTR(in_proximity_scale_available,
"128 64 32 16 8 4");
static IIO_CONST_ATTR(in_intensity_scale_available,
"128 64 32 16 8 4 2 1");
static IIO_CONST_ATTR(in_intensity_ir_scale_available,
"128 64 32 16 8 4 2 1");
static int si1145_scale_from_adcgain(int regval)
{
return 128 >> regval;
}
static int si1145_proximity_adcgain_from_scale(int val, int val2)
{
val = find_closest_descending(val, si1145_proximity_scale_available,
ARRAY_SIZE(si1145_proximity_scale_available));
if (val < 0 || val > 5 || val2 != 0)
return -EINVAL;
return val;
}
static int si1145_intensity_adcgain_from_scale(int val, int val2)
{
val = find_closest_descending(val, si1145_intensity_scale_available,
ARRAY_SIZE(si1145_intensity_scale_available));
if (val < 0 || val > 7 || val2 != 0)
return -EINVAL;
return val;
}
static int si1145_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct si1145_data *data = iio_priv(indio_dev);
int ret;
u8 reg;
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_INTENSITY:
case IIO_PROXIMITY:
case IIO_VOLTAGE:
case IIO_TEMP:
case IIO_UVINDEX:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = si1145_measure(indio_dev, chan);
iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
case IIO_CURRENT:
ret = i2c_smbus_read_byte_data(data->client,
SI1145_PS_LED_REG(chan->channel));
if (ret < 0)
return ret;
*val = (ret >> SI1145_PS_LED_SHIFT(chan->channel))
& 0x0f;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_PROXIMITY:
reg = SI1145_PARAM_PS_ADC_GAIN;
break;
case IIO_INTENSITY:
if (chan->channel2 == IIO_MOD_LIGHT_IR)
reg = SI1145_PARAM_ALSIR_ADC_GAIN;
else
reg = SI1145_PARAM_ALSVIS_ADC_GAIN;
break;
case IIO_TEMP:
*val = 28;
*val2 = 571429;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_UVINDEX:
*val = 0;
*val2 = 10000;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
ret = si1145_param_query(data, reg);
if (ret < 0)
return ret;
*val = si1145_scale_from_adcgain(ret & 0x07);
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
switch (chan->type) {
case IIO_TEMP:
/*
* -ADC offset - ADC counts @ 25°C -
* 35 * ADC counts / °C
*/
*val = -256 - 11136 + 25 * 35;
return IIO_VAL_INT;
default:
/*
* All ADC measurements have are by default offset
* by -256
* See AN498 5.6.3
*/
ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET);
if (ret < 0)
return ret;
*val = -si1145_uncompress(ret);
return IIO_VAL_INT;
}
case IIO_CHAN_INFO_SAMP_FREQ:
return si1145_read_samp_freq(data, val, val2);
default:
return -EINVAL;
}
}
static int si1145_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct si1145_data *data = iio_priv(indio_dev);
u8 reg1, reg2, shift;
int ret;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_PROXIMITY:
val = si1145_proximity_adcgain_from_scale(val, val2);
if (val < 0)
return val;
reg1 = SI1145_PARAM_PS_ADC_GAIN;
reg2 = SI1145_PARAM_PS_ADC_COUNTER;
break;
case IIO_INTENSITY:
val = si1145_intensity_adcgain_from_scale(val, val2);
if (val < 0)
return val;
if (chan->channel2 == IIO_MOD_LIGHT_IR) {
reg1 = SI1145_PARAM_ALSIR_ADC_GAIN;
reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER;
} else {
reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN;
reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER;
}
break;
default:
return -EINVAL;
}
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = si1145_param_set(data, reg1, val);
if (ret < 0) {
iio_device_release_direct_mode(indio_dev);
return ret;
}
/* Set recovery period to one's complement of gain */
ret = si1145_param_set(data, reg2, (~val & 0x07) << 4);
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_RAW:
if (chan->type != IIO_CURRENT)
return -EINVAL;
if (val < 0 || val > 15 || val2 != 0)
return -EINVAL;
reg1 = SI1145_PS_LED_REG(chan->channel);
shift = SI1145_PS_LED_SHIFT(chan->channel);
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = i2c_smbus_read_byte_data(data->client, reg1);
if (ret < 0) {
iio_device_release_direct_mode(indio_dev);
return ret;
}
ret = i2c_smbus_write_byte_data(data->client, reg1,
(ret & ~(0x0f << shift)) |
((val & 0x0f) << shift));
iio_device_release_direct_mode(indio_dev);
return ret;
case IIO_CHAN_INFO_SAMP_FREQ:
return si1145_store_samp_freq(data, val);
default:
return -EINVAL;
}
}
#define SI1145_ST { \
.sign = 'u', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_LE, \
}
#define SI1145_INTENSITY_CHANNEL(_si) { \
.type = IIO_INTENSITY, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_OFFSET) | \
BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_type = SI1145_ST, \
.scan_index = _si, \
.address = SI1145_REG_ALSVIS_DATA, \
}
#define SI1145_INTENSITY_IR_CHANNEL(_si) { \
.type = IIO_INTENSITY, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_OFFSET) | \
BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.modified = 1, \
.channel2 = IIO_MOD_LIGHT_IR, \
.scan_type = SI1145_ST, \
.scan_index = _si, \
.address = SI1145_REG_ALSIR_DATA, \
}
#define SI1145_TEMP_CHANNEL(_si) { \
.type = IIO_TEMP, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_OFFSET) | \
BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_type = SI1145_ST, \
.scan_index = _si, \
.address = SI1145_REG_AUX_DATA, \
}
#define SI1145_UV_CHANNEL(_si) { \
.type = IIO_UVINDEX, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_type = SI1145_ST, \
.scan_index = _si, \
.address = SI1145_REG_AUX_DATA, \
}
#define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \
.type = IIO_PROXIMITY, \
.indexed = 1, \
.channel = _ch, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_type = SI1145_ST, \
.scan_index = _si, \
.address = SI1145_REG_PS1_DATA + _ch * 2, \
}
#define SI1145_VOLTAGE_CHANNEL(_si) { \
.type = IIO_VOLTAGE, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_type = SI1145_ST, \
.scan_index = _si, \
.address = SI1145_REG_AUX_DATA, \
}
#define SI1145_CURRENT_CHANNEL(_ch) { \
.type = IIO_CURRENT, \
.indexed = 1, \
.channel = _ch, \
.output = 1, \
.scan_index = -1, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
}
static const struct iio_chan_spec si1132_channels[] = {
SI1145_INTENSITY_CHANNEL(0),
SI1145_INTENSITY_IR_CHANNEL(1),
SI1145_TEMP_CHANNEL(2),
SI1145_VOLTAGE_CHANNEL(3),
SI1145_UV_CHANNEL(4),
IIO_CHAN_SOFT_TIMESTAMP(6),
};
static const struct iio_chan_spec si1141_channels[] = {
SI1145_INTENSITY_CHANNEL(0),
SI1145_INTENSITY_IR_CHANNEL(1),
SI1145_PROXIMITY_CHANNEL(2, 0),
SI1145_TEMP_CHANNEL(3),
SI1145_VOLTAGE_CHANNEL(4),
IIO_CHAN_SOFT_TIMESTAMP(5),
SI1145_CURRENT_CHANNEL(0),
};
static const struct iio_chan_spec si1142_channels[] = {
SI1145_INTENSITY_CHANNEL(0),
SI1145_INTENSITY_IR_CHANNEL(1),
SI1145_PROXIMITY_CHANNEL(2, 0),
SI1145_PROXIMITY_CHANNEL(3, 1),
SI1145_TEMP_CHANNEL(4),
SI1145_VOLTAGE_CHANNEL(5),
IIO_CHAN_SOFT_TIMESTAMP(6),
SI1145_CURRENT_CHANNEL(0),
SI1145_CURRENT_CHANNEL(1),
};
static const struct iio_chan_spec si1143_channels[] = {
SI1145_INTENSITY_CHANNEL(0),
SI1145_INTENSITY_IR_CHANNEL(1),
SI1145_PROXIMITY_CHANNEL(2, 0),
SI1145_PROXIMITY_CHANNEL(3, 1),
SI1145_PROXIMITY_CHANNEL(4, 2),
SI1145_TEMP_CHANNEL(5),
SI1145_VOLTAGE_CHANNEL(6),
IIO_CHAN_SOFT_TIMESTAMP(7),
SI1145_CURRENT_CHANNEL(0),
SI1145_CURRENT_CHANNEL(1),
SI1145_CURRENT_CHANNEL(2),
};
static const struct iio_chan_spec si1145_channels[] = {
SI1145_INTENSITY_CHANNEL(0),
SI1145_INTENSITY_IR_CHANNEL(1),
SI1145_PROXIMITY_CHANNEL(2, 0),
SI1145_TEMP_CHANNEL(3),
SI1145_VOLTAGE_CHANNEL(4),
SI1145_UV_CHANNEL(5),
IIO_CHAN_SOFT_TIMESTAMP(6),
SI1145_CURRENT_CHANNEL(0),
};
static const struct iio_chan_spec si1146_channels[] = {
SI1145_INTENSITY_CHANNEL(0),
SI1145_INTENSITY_IR_CHANNEL(1),
SI1145_TEMP_CHANNEL(2),
SI1145_VOLTAGE_CHANNEL(3),
SI1145_UV_CHANNEL(4),
SI1145_PROXIMITY_CHANNEL(5, 0),
SI1145_PROXIMITY_CHANNEL(6, 1),
IIO_CHAN_SOFT_TIMESTAMP(7),
SI1145_CURRENT_CHANNEL(0),
SI1145_CURRENT_CHANNEL(1),
};
static const struct iio_chan_spec si1147_channels[] = {
SI1145_INTENSITY_CHANNEL(0),
SI1145_INTENSITY_IR_CHANNEL(1),
SI1145_PROXIMITY_CHANNEL(2, 0),
SI1145_PROXIMITY_CHANNEL(3, 1),
SI1145_PROXIMITY_CHANNEL(4, 2),
SI1145_TEMP_CHANNEL(5),
SI1145_VOLTAGE_CHANNEL(6),
SI1145_UV_CHANNEL(7),
IIO_CHAN_SOFT_TIMESTAMP(8),
SI1145_CURRENT_CHANNEL(0),
SI1145_CURRENT_CHANNEL(1),
SI1145_CURRENT_CHANNEL(2),
};
static struct attribute *si1132_attributes[] = {
&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
&iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
NULL,
};
static struct attribute *si114x_attributes[] = {
&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
&iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
NULL,
};
static const struct attribute_group si1132_attribute_group = {
.attrs = si1132_attributes,
};
static const struct attribute_group si114x_attribute_group = {
.attrs = si114x_attributes,
};
static const struct iio_info si1132_info = {
.read_raw = si1145_read_raw,
.write_raw = si1145_write_raw,
.driver_module = THIS_MODULE,
.attrs = &si1132_attribute_group,
};
static const struct iio_info si114x_info = {
.read_raw = si1145_read_raw,
.write_raw = si1145_write_raw,
.driver_module = THIS_MODULE,
.attrs = &si114x_attribute_group,
};
#define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \
{id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate}
static const struct si1145_part_info si1145_part_info[] = {
[SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true),
[SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false),
[SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false),
[SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false),
[SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true),
[SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true),
[SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true),
};
static int si1145_initialize(struct si1145_data *data)
{
struct i2c_client *client = data->client;
int ret;
ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
SI1145_CMD_RESET);
if (ret < 0)
return ret;
msleep(SI1145_COMMAND_TIMEOUT_MS);
/* Hardware key, magic value */
ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17);
if (ret < 0)
return ret;
msleep(SI1145_COMMAND_TIMEOUT_MS);
/* Turn off autonomous mode */
ret = si1145_set_meas_rate(data, 0);
if (ret < 0)
return ret;
/* Initialize sampling freq to 10 Hz */
ret = si1145_store_samp_freq(data, 10);
if (ret < 0)
return ret;
/* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */
switch (data->part_info->num_leds) {
case 3:
ret = i2c_smbus_write_byte_data(client,
SI1145_REG_PS_LED3,
SI1145_LED_CURRENT_45mA);
if (ret < 0)
return ret;
/* fallthrough */
case 2:
ret = i2c_smbus_write_byte_data(client,
SI1145_REG_PS_LED21,
(SI1145_LED_CURRENT_45mA << 4) |
SI1145_LED_CURRENT_45mA);
break;
case 1:
ret = i2c_smbus_write_byte_data(client,
SI1145_REG_PS_LED21,
SI1145_LED_CURRENT_45mA);
break;
default:
ret = 0;
break;
}
if (ret < 0)
return ret;
/* Set normal proximity measurement mode */
ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC,
SI1145_PS_ADC_MODE_NORMAL);
if (ret < 0)
return ret;
ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01);
if (ret < 0)
return ret;
/* ADC_COUNTER should be one complement of ADC_GAIN */
ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 4);
if (ret < 0)
return ret;
/* Set ALS visible measurement mode */
ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC,
SI1145_ADC_MISC_RANGE);
if (ret < 0)
return ret;
ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03);
if (ret < 0)
return ret;
ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER,
0x04 << 4);
if (ret < 0)
return ret;
/* Set ALS IR measurement mode */
ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC,
SI1145_ADC_MISC_RANGE);
if (ret < 0)
return ret;
ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01);
if (ret < 0)
return ret;
ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER,
0x06 << 4);
if (ret < 0)
return ret;
/*
* Initialize UCOEF to default values in datasheet
* These registers are normally zero on reset
*/
if (data->part_info == &si1145_part_info[SI1132] ||
data->part_info == &si1145_part_info[SI1145] ||
data->part_info == &si1145_part_info[SI1146] ||
data->part_info == &si1145_part_info[SI1147]) {
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_UCOEF1,
SI1145_UCOEF1_DEFAULT);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT);
if (ret < 0)
return ret;
}
return 0;
}
/*
* Program the channels we want to measure with CMD_PSALS_AUTO. No need for
* _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct)
* mode reprograms the channels list anyway...
*/
static int si1145_buffer_preenable(struct iio_dev *indio_dev)
{
struct si1145_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->lock);
ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask);
mutex_unlock(&data->lock);
return ret;
}
static bool si1145_validate_scan_mask(struct iio_dev *indio_dev,
const unsigned long *scan_mask)
{
struct si1145_data *data = iio_priv(indio_dev);
unsigned int count = 0;
int i;
/* Check that at most one AUX channel is enabled */
for_each_set_bit(i, scan_mask, data->part_info->num_channels) {
if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA)
count++;
}
return count <= 1;
}
static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = {
.preenable = si1145_buffer_preenable,
.postenable = iio_triggered_buffer_postenable,
.predisable = iio_triggered_buffer_predisable,
.validate_scan_mask = si1145_validate_scan_mask,
};
/**
* si1145_trigger_set_state() - Set trigger state
*
* When not using triggers interrupts are disabled and measurement rate is
* set to zero in order to minimize power consumption.
*/
static int si1145_trigger_set_state(struct iio_trigger *trig, bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct si1145_data *data = iio_priv(indio_dev);
int err = 0, ret;
mutex_lock(&data->lock);
if (state) {
data->autonomous = true;
err = i2c_smbus_write_byte_data(data->client,
SI1145_REG_INT_CFG, SI1145_INT_CFG_OE);
if (err < 0)
goto disable;
err = i2c_smbus_write_byte_data(data->client,
SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE);
if (err < 0)
goto disable;
err = si1145_set_meas_rate(data, data->meas_rate);
if (err < 0)
goto disable;
err = si1145_command(data, SI1145_CMD_PSALS_AUTO);
if (err < 0)
goto disable;
} else {
disable:
/* Disable as much as possible skipping errors */
ret = si1145_command(data, SI1145_CMD_PSALS_PAUSE);
if (ret < 0 && !err)
err = ret;
ret = si1145_set_meas_rate(data, 0);
if (ret < 0 && !err)
err = ret;
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_IRQ_ENABLE, 0);
if (ret < 0 && !err)
err = ret;
ret = i2c_smbus_write_byte_data(data->client,
SI1145_REG_INT_CFG, 0);
if (ret < 0 && !err)
err = ret;
data->autonomous = false;
}
mutex_unlock(&data->lock);
return err;
}
static const struct iio_trigger_ops si1145_trigger_ops = {
.owner = THIS_MODULE,
.set_trigger_state = si1145_trigger_set_state,
};
static int si1145_probe_trigger(struct iio_dev *indio_dev)
{
struct si1145_data *data = iio_priv(indio_dev);
struct i2c_client *client = data->client;
struct iio_trigger *trig;
int ret;
trig = devm_iio_trigger_alloc(&client->dev,
"%s-dev%d", indio_dev->name, indio_dev->id);
if (!trig)
return -ENOMEM;
trig->dev.parent = &client->dev;
trig->ops = &si1145_trigger_ops;
iio_trigger_set_drvdata(trig, indio_dev);
ret = devm_request_irq(&client->dev, client->irq,
iio_trigger_generic_data_rdy_poll,
IRQF_TRIGGER_FALLING,
"si1145_irq",
trig);
if (ret < 0) {
dev_err(&client->dev, "irq request failed\n");
return ret;
}
ret = iio_trigger_register(trig);
if (ret)
return ret;
data->trig = trig;
indio_dev->trig = iio_trigger_get(data->trig);
return 0;
}
static void si1145_remove_trigger(struct iio_dev *indio_dev)
{
struct si1145_data *data = iio_priv(indio_dev);
if (data->trig) {
iio_trigger_unregister(data->trig);
data->trig = NULL;
}
}
static int si1145_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct si1145_data *data;
struct iio_dev *indio_dev;
u8 part_id, rev_id, seq_id;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
data->part_info = &si1145_part_info[id->driver_data];
part_id = ret = i2c_smbus_read_byte_data(data->client,
SI1145_REG_PART_ID);
if (ret < 0)
return ret;
rev_id = ret = i2c_smbus_read_byte_data(data->client,
SI1145_REG_REV_ID);
if (ret < 0)
return ret;
seq_id = ret = i2c_smbus_read_byte_data(data->client,
SI1145_REG_SEQ_ID);
if (ret < 0)
return ret;
dev_info(&client->dev, "device ID part %#02hhx rev %#02hhx seq %#02hhx\n",
part_id, rev_id, seq_id);
if (part_id != data->part_info->part) {
dev_err(&client->dev, "part ID mismatch got %#02hhx, expected %#02x\n",
part_id, data->part_info->part);
return -ENODEV;
}
indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;
indio_dev->channels = data->part_info->channels;
indio_dev->num_channels = data->part_info->num_channels;
indio_dev->info = data->part_info->iio_info;
indio_dev->modes = INDIO_DIRECT_MODE;
mutex_init(&data->lock);
mutex_init(&data->cmdlock);
ret = si1145_initialize(data);
if (ret < 0)
return ret;
ret = iio_triggered_buffer_setup(indio_dev, NULL,
si1145_trigger_handler, &si1145_buffer_setup_ops);
if (ret < 0)
return ret;
if (client->irq) {
ret = si1145_probe_trigger(indio_dev);
if (ret < 0)
goto error_free_buffer;
} else {
dev_info(&client->dev, "no irq, using polling\n");
}
ret = iio_device_register(indio_dev);
if (ret < 0)
goto error_free_trigger;
return 0;
error_free_trigger:
si1145_remove_trigger(indio_dev);
error_free_buffer:
iio_triggered_buffer_cleanup(indio_dev);
return ret;
}
static const struct i2c_device_id si1145_ids[] = {
{ "si1132", SI1132 },
{ "si1141", SI1141 },
{ "si1142", SI1142 },
{ "si1143", SI1143 },
{ "si1145", SI1145 },
{ "si1146", SI1146 },
{ "si1147", SI1147 },
{ }
};
MODULE_DEVICE_TABLE(i2c, si1145_ids);
static int si1145_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
si1145_remove_trigger(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
return 0;
}
static struct i2c_driver si1145_driver = {
.driver = {
.name = "si1145",
},
.probe = si1145_probe,
.remove = si1145_remove,
.id_table = si1145_ids,
};
module_i2c_driver(si1145_driver);
MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver");
MODULE_LICENSE("GPL");