#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#define CM36651_I2C_ADDR_PS 0x19
#define CM36651_ARA 0x0C
#define CM36651_CS_CONF1 0x00
#define CM36651_CS_CONF2 0x01
#define CM36651_ALS_WH_M 0x02
#define CM36651_ALS_WH_L 0x03
#define CM36651_ALS_WL_M 0x04
#define CM36651_ALS_WL_L 0x05
#define CM36651_CS_CONF3 0x06
#define CM36651_CS_CONF_REG_NUM 0x02
#define CM36651_PS_CONF1 0x00
#define CM36651_PS_THD 0x01
#define CM36651_PS_CANC 0x02
#define CM36651_PS_CONF2 0x03
#define CM36651_PS_REG_NUM 0x04
#define CM36651_ALS_ENABLE 0x00
#define CM36651_ALS_DISABLE 0x01
#define CM36651_ALS_INT_EN 0x02
#define CM36651_ALS_THRES 0x04
#define CM36651_CS_CONF2_DEFAULT_BIT 0x08
#define CM36651_CS_IT1 0x00
#define CM36651_CS_IT2 0x40
#define CM36651_CS_IT3 0x80
#define CM36651_CS_IT4 0xC0
#define CM36651_PS_ENABLE 0x00
#define CM36651_PS_DISABLE 0x01
#define CM36651_PS_INT_EN 0x02
#define CM36651_PS_PERS2 0x04
#define CM36651_PS_PERS3 0x08
#define CM36651_PS_PERS4 0x0C
#define CM36651_PS_IT1 0x00
#define CM36651_PS_IT2 0x10
#define CM36651_PS_IT3 0x20
#define CM36651_PS_IT4 0x30
#define CM36651_PS_DR1 0x00
#define CM36651_PS_DR2 0x40
#define CM36651_PS_DR3 0x80
#define CM36651_PS_DR4 0xC0
#define CM36651_PS_INITIAL_THD 0x05
#define CM36651_PS_CANC_DEFAULT 0x00
#define CM36651_PS_HYS1 0x00
#define CM36651_PS_HYS2 0x01
#define CM36651_PS_SMART_PERS_EN 0x02
#define CM36651_PS_DIR_INT 0x04
#define CM36651_PS_MS 0x10
#define CM36651_CS_COLOR_NUM 4
#define CM36651_CLOSE_PROXIMITY 0x32
#define CM36651_FAR_PROXIMITY 0x33
#define CM36651_CS_INT_TIME_AVAIL "0.08 0.16 0.32 0.64"
#define CM36651_PS_INT_TIME_AVAIL "0.000320 0.000420 0.000520 0.000640"
enum cm36651_operation_mode {
CM36651_LIGHT_EN,
CM36651_PROXIMITY_EN,
CM36651_PROXIMITY_EV_EN,
};
enum cm36651_light_channel_idx {
CM36651_LIGHT_CHANNEL_IDX_RED,
CM36651_LIGHT_CHANNEL_IDX_GREEN,
CM36651_LIGHT_CHANNEL_IDX_BLUE,
CM36651_LIGHT_CHANNEL_IDX_CLEAR,
};
enum cm36651_command {
CM36651_CMD_READ_RAW_LIGHT,
CM36651_CMD_READ_RAW_PROXIMITY,
CM36651_CMD_PROX_EV_EN,
CM36651_CMD_PROX_EV_DIS,
};
static const u8 cm36651_cs_reg[CM36651_CS_CONF_REG_NUM] = {
CM36651_CS_CONF1,
CM36651_CS_CONF2,
};
static const u8 cm36651_ps_reg[CM36651_PS_REG_NUM] = {
CM36651_PS_CONF1,
CM36651_PS_THD,
CM36651_PS_CANC,
CM36651_PS_CONF2,
};
struct cm36651_data {
const struct cm36651_platform_data *pdata;
struct i2c_client *client;
struct i2c_client *ps_client;
struct i2c_client *ara_client;
struct mutex lock;
struct regulator *vled_reg;
unsigned long flags;
int cs_int_time[CM36651_CS_COLOR_NUM];
int ps_int_time;
u8 cs_ctrl_regs[CM36651_CS_CONF_REG_NUM];
u8 ps_ctrl_regs[CM36651_PS_REG_NUM];
u16 color[CM36651_CS_COLOR_NUM];
};
static int cm36651_setup_reg(struct cm36651_data *cm36651)
{
struct i2c_client *client = cm36651->client;
struct i2c_client *ps_client = cm36651->ps_client;
int i, ret;
cm36651->cs_ctrl_regs[CM36651_CS_CONF1] = CM36651_ALS_ENABLE |
CM36651_ALS_THRES;
cm36651->cs_ctrl_regs[CM36651_CS_CONF2] = CM36651_CS_CONF2_DEFAULT_BIT;
for (i = 0; i < CM36651_CS_CONF_REG_NUM; i++) {
ret = i2c_smbus_write_byte_data(client, cm36651_cs_reg[i],
cm36651->cs_ctrl_regs[i]);
if (ret < 0)
return ret;
}
cm36651->ps_ctrl_regs[CM36651_PS_CONF1] = CM36651_PS_ENABLE |
CM36651_PS_IT2;
cm36651->ps_ctrl_regs[CM36651_PS_THD] = CM36651_PS_INITIAL_THD;
cm36651->ps_ctrl_regs[CM36651_PS_CANC] = CM36651_PS_CANC_DEFAULT;
cm36651->ps_ctrl_regs[CM36651_PS_CONF2] = CM36651_PS_HYS2 |
CM36651_PS_DIR_INT | CM36651_PS_SMART_PERS_EN;
for (i = 0; i < CM36651_PS_REG_NUM; i++) {
ret = i2c_smbus_write_byte_data(ps_client, cm36651_ps_reg[i],
cm36651->ps_ctrl_regs[i]);
if (ret < 0)
return ret;
}
ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
CM36651_ALS_DISABLE);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(cm36651->ps_client,
CM36651_PS_CONF1, CM36651_PS_DISABLE);
if (ret < 0)
return ret;
return 0;
}
static int cm36651_read_output(struct cm36651_data *cm36651,
struct iio_chan_spec const *chan, int *val)
{
struct i2c_client *client = cm36651->client;
int ret = -EINVAL;
switch (chan->type) {
case IIO_LIGHT:
*val = i2c_smbus_read_word_data(client, chan->address);
if (*val < 0)
return ret;
ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
CM36651_ALS_DISABLE);
if (ret < 0)
return ret;
ret = IIO_VAL_INT;
break;
case IIO_PROXIMITY:
*val = i2c_smbus_read_byte(cm36651->ps_client);
if (*val < 0)
return ret;
if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
ret = i2c_smbus_write_byte_data(cm36651->ps_client,
CM36651_PS_CONF1, CM36651_PS_DISABLE);
if (ret < 0)
return ret;
}
ret = IIO_VAL_INT;
break;
default:
break;
}
return ret;
}
static irqreturn_t cm36651_irq_handler(int irq, void *data)
{
struct iio_dev *indio_dev = data;
struct cm36651_data *cm36651 = iio_priv(indio_dev);
struct i2c_client *client = cm36651->client;
int ev_dir, ret;
u64 ev_code;
ret = i2c_smbus_read_byte(cm36651->ara_client);
if (ret < 0) {
dev_err(&client->dev,
"%s: Data read failed: %d\n", __func__, ret);
return IRQ_HANDLED;
}
switch (ret) {
case CM36651_CLOSE_PROXIMITY:
ev_dir = IIO_EV_DIR_RISING;
break;
case CM36651_FAR_PROXIMITY:
ev_dir = IIO_EV_DIR_FALLING;
break;
default:
dev_err(&client->dev,
"%s: Data read wrong: %d\n", __func__, ret);
return IRQ_HANDLED;
}
ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
CM36651_CMD_READ_RAW_PROXIMITY,
IIO_EV_TYPE_THRESH, ev_dir);
iio_push_event(indio_dev, ev_code, iio_get_time_ns(indio_dev));
return IRQ_HANDLED;
}
static int cm36651_set_operation_mode(struct cm36651_data *cm36651, int cmd)
{
struct i2c_client *client = cm36651->client;
struct i2c_client *ps_client = cm36651->ps_client;
int ret = -EINVAL;
switch (cmd) {
case CM36651_CMD_READ_RAW_LIGHT:
ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF1,
cm36651->cs_ctrl_regs[CM36651_CS_CONF1]);
break;
case CM36651_CMD_READ_RAW_PROXIMITY:
if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags))
return CM36651_PROXIMITY_EV_EN;
ret = i2c_smbus_write_byte_data(ps_client, CM36651_PS_CONF1,
cm36651->ps_ctrl_regs[CM36651_PS_CONF1]);
break;
case CM36651_CMD_PROX_EV_EN:
if (test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
dev_err(&client->dev,
"Already proximity event enable state\n");
return ret;
}
set_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
ret = i2c_smbus_write_byte_data(ps_client,
cm36651_ps_reg[CM36651_PS_CONF1],
CM36651_PS_INT_EN | CM36651_PS_PERS2 | CM36651_PS_IT2);
if (ret < 0) {
dev_err(&client->dev, "Proximity enable event failed\n");
return ret;
}
break;
case CM36651_CMD_PROX_EV_DIS:
if (!test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags)) {
dev_err(&client->dev,
"Already proximity event disable state\n");
return ret;
}
clear_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
ret = i2c_smbus_write_byte_data(ps_client,
CM36651_PS_CONF1, CM36651_PS_DISABLE);
break;
}
if (ret < 0)
dev_err(&client->dev, "Write register failed\n");
return ret;
}
static int cm36651_read_channel(struct cm36651_data *cm36651,
struct iio_chan_spec const *chan, int *val)
{
struct i2c_client *client = cm36651->client;
int cmd, ret;
if (chan->type == IIO_LIGHT)
cmd = CM36651_CMD_READ_RAW_LIGHT;
else if (chan->type == IIO_PROXIMITY)
cmd = CM36651_CMD_READ_RAW_PROXIMITY;
else
return -EINVAL;
ret = cm36651_set_operation_mode(cm36651, cmd);
if (ret < 0) {
dev_err(&client->dev, "CM36651 set operation mode failed\n");
return ret;
}
msleep(50);
ret = cm36651_read_output(cm36651, chan, val);
if (ret < 0) {
dev_err(&client->dev, "CM36651 read output failed\n");
return ret;
}
return ret;
}
static int cm36651_read_int_time(struct cm36651_data *cm36651,
struct iio_chan_spec const *chan, int *val2)
{
switch (chan->type) {
case IIO_LIGHT:
if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT1)
*val2 = 80000;
else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT2)
*val2 = 160000;
else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT3)
*val2 = 320000;
else if (cm36651->cs_int_time[chan->address] == CM36651_CS_IT4)
*val2 = 640000;
else
return -EINVAL;
break;
case IIO_PROXIMITY:
if (cm36651->ps_int_time == CM36651_PS_IT1)
*val2 = 320;
else if (cm36651->ps_int_time == CM36651_PS_IT2)
*val2 = 420;
else if (cm36651->ps_int_time == CM36651_PS_IT3)
*val2 = 520;
else if (cm36651->ps_int_time == CM36651_PS_IT4)
*val2 = 640;
else
return -EINVAL;
break;
default:
return -EINVAL;
}
return IIO_VAL_INT_PLUS_MICRO;
}
static int cm36651_write_int_time(struct cm36651_data *cm36651,
struct iio_chan_spec const *chan, int val)
{
struct i2c_client *client = cm36651->client;
struct i2c_client *ps_client = cm36651->ps_client;
int int_time, ret;
switch (chan->type) {
case IIO_LIGHT:
if (val == 80000)
int_time = CM36651_CS_IT1;
else if (val == 160000)
int_time = CM36651_CS_IT2;
else if (val == 320000)
int_time = CM36651_CS_IT3;
else if (val == 640000)
int_time = CM36651_CS_IT4;
else
return -EINVAL;
ret = i2c_smbus_write_byte_data(client, CM36651_CS_CONF3,
int_time >> 2 * (chan->address));
if (ret < 0) {
dev_err(&client->dev, "CS integration time write failed\n");
return ret;
}
cm36651->cs_int_time[chan->address] = int_time;
break;
case IIO_PROXIMITY:
if (val == 320)
int_time = CM36651_PS_IT1;
else if (val == 420)
int_time = CM36651_PS_IT2;
else if (val == 520)
int_time = CM36651_PS_IT3;
else if (val == 640)
int_time = CM36651_PS_IT4;
else
return -EINVAL;
ret = i2c_smbus_write_byte_data(ps_client,
CM36651_PS_CONF1, int_time);
if (ret < 0) {
dev_err(&client->dev, "PS integration time write failed\n");
return ret;
}
cm36651->ps_int_time = int_time;
break;
default:
return -EINVAL;
}
return ret;
}
static int cm36651_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct cm36651_data *cm36651 = iio_priv(indio_dev);
int ret;
mutex_lock(&cm36651->lock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = cm36651_read_channel(cm36651, chan, val);
break;
case IIO_CHAN_INFO_INT_TIME:
*val = 0;
ret = cm36651_read_int_time(cm36651, chan, val2);
break;
default:
ret = -EINVAL;
}
mutex_unlock(&cm36651->lock);
return ret;
}
static int cm36651_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct cm36651_data *cm36651 = iio_priv(indio_dev);
struct i2c_client *client = cm36651->client;
int ret = -EINVAL;
if (mask == IIO_CHAN_INFO_INT_TIME) {
ret = cm36651_write_int_time(cm36651, chan, val2);
if (ret < 0)
dev_err(&client->dev, "Integration time write failed\n");
}
return ret;
}
static int cm36651_read_prox_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 cm36651_data *cm36651 = iio_priv(indio_dev);
*val = cm36651->ps_ctrl_regs[CM36651_PS_THD];
return 0;
}
static int cm36651_write_prox_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 cm36651_data *cm36651 = iio_priv(indio_dev);
struct i2c_client *client = cm36651->client;
int ret;
if (val < 3 || val > 255)
return -EINVAL;
cm36651->ps_ctrl_regs[CM36651_PS_THD] = val;
ret = i2c_smbus_write_byte_data(cm36651->ps_client, CM36651_PS_THD,
cm36651->ps_ctrl_regs[CM36651_PS_THD]);
if (ret < 0) {
dev_err(&client->dev, "PS threshold write failed: %d\n", ret);
return ret;
}
return 0;
}
static int cm36651_write_prox_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
bool state)
{
struct cm36651_data *cm36651 = iio_priv(indio_dev);
int cmd, ret;
mutex_lock(&cm36651->lock);
cmd = state ? CM36651_CMD_PROX_EV_EN : CM36651_CMD_PROX_EV_DIS;
ret = cm36651_set_operation_mode(cm36651, cmd);
mutex_unlock(&cm36651->lock);
return ret;
}
static int cm36651_read_prox_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct cm36651_data *cm36651 = iio_priv(indio_dev);
int event_en;
mutex_lock(&cm36651->lock);
event_en = test_bit(CM36651_PROXIMITY_EV_EN, &cm36651->flags);
mutex_unlock(&cm36651->lock);
return event_en;
}
#define CM36651_LIGHT_CHANNEL(_color, _idx) { \
.type = IIO_LIGHT, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_INT_TIME), \
.address = _idx, \
.modified = 1, \
.channel2 = IIO_MOD_LIGHT_##_color, \
} \
static const struct iio_event_spec cm36651_event_spec[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
}
};
static const struct iio_chan_spec cm36651_channels[] = {
{
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME),
.event_spec = cm36651_event_spec,
.num_event_specs = ARRAY_SIZE(cm36651_event_spec),
},
CM36651_LIGHT_CHANNEL(RED, CM36651_LIGHT_CHANNEL_IDX_RED),
CM36651_LIGHT_CHANNEL(GREEN, CM36651_LIGHT_CHANNEL_IDX_GREEN),
CM36651_LIGHT_CHANNEL(BLUE, CM36651_LIGHT_CHANNEL_IDX_BLUE),
CM36651_LIGHT_CHANNEL(CLEAR, CM36651_LIGHT_CHANNEL_IDX_CLEAR),
};
static IIO_CONST_ATTR(in_illuminance_integration_time_available,
CM36651_CS_INT_TIME_AVAIL);
static IIO_CONST_ATTR(in_proximity_integration_time_available,
CM36651_PS_INT_TIME_AVAIL);
static struct attribute *cm36651_attributes[] = {
&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
NULL,
};
static const struct attribute_group cm36651_attribute_group = {
.attrs = cm36651_attributes
};
static const struct iio_info cm36651_info = {
.read_raw = &cm36651_read_raw,
.write_raw = &cm36651_write_raw,
.read_event_value = &cm36651_read_prox_thresh,
.write_event_value = &cm36651_write_prox_thresh,
.read_event_config = &cm36651_read_prox_event_config,
.write_event_config = &cm36651_write_prox_event_config,
.attrs = &cm36651_attribute_group,
};
static int cm36651_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct cm36651_data *cm36651;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm36651));
if (!indio_dev)
return -ENOMEM;
cm36651 = iio_priv(indio_dev);
cm36651->vled_reg = devm_regulator_get(&client->dev, "vled");
if (IS_ERR(cm36651->vled_reg))
return dev_err_probe(&client->dev, PTR_ERR(cm36651->vled_reg),
"get regulator vled failed\n");
ret = regulator_enable(cm36651->vled_reg);
if (ret) {
dev_err(&client->dev, "enable regulator vled failed\n");
return ret;
}
i2c_set_clientdata(client, indio_dev);
cm36651->client = client;
cm36651->ps_client = i2c_new_dummy_device(client->adapter,
CM36651_I2C_ADDR_PS);
if (IS_ERR(cm36651->ps_client)) {
dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
ret = PTR_ERR(cm36651->ps_client);
goto error_disable_reg;
}
cm36651->ara_client = i2c_new_dummy_device(client->adapter, CM36651_ARA);
if (IS_ERR(cm36651->ara_client)) {
dev_err(&client->dev, "%s: new i2c device failed\n", __func__);
ret = PTR_ERR(cm36651->ara_client);
goto error_i2c_unregister_ps;
}
mutex_init(&cm36651->lock);
indio_dev->channels = cm36651_channels;
indio_dev->num_channels = ARRAY_SIZE(cm36651_channels);
indio_dev->info = &cm36651_info;
indio_dev->name = id->name;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = cm36651_setup_reg(cm36651);
if (ret) {
dev_err(&client->dev, "%s: register setup failed\n", __func__);
goto error_i2c_unregister_ara;
}
ret = request_threaded_irq(client->irq, NULL, cm36651_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"cm36651", indio_dev);
if (ret) {
dev_err(&client->dev, "%s: request irq failed\n", __func__);
goto error_i2c_unregister_ara;
}
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&client->dev, "%s: register device failed\n", __func__);
goto error_free_irq;
}
return 0;
error_free_irq:
free_irq(client->irq, indio_dev);
error_i2c_unregister_ara:
i2c_unregister_device(cm36651->ara_client);
error_i2c_unregister_ps:
i2c_unregister_device(cm36651->ps_client);
error_disable_reg:
regulator_disable(cm36651->vled_reg);
return ret;
}
static void cm36651_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct cm36651_data *cm36651 = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
regulator_disable(cm36651->vled_reg);
free_irq(client->irq, indio_dev);
i2c_unregister_device(cm36651->ps_client);
i2c_unregister_device(cm36651->ara_client);
}
static const struct i2c_device_id cm36651_id[] = {
{ "cm36651" },
{ }
};
MODULE_DEVICE_TABLE(i2c, cm36651_id);
static const struct of_device_id cm36651_of_match[] = {
{ .compatible = "capella,cm36651" },
{ }
};
MODULE_DEVICE_TABLE(of, cm36651_of_match);
static struct i2c_driver cm36651_driver = {
.driver = {
.name = "cm36651",
.of_match_table = cm36651_of_match,
},
.probe = cm36651_probe,
.remove = cm36651_remove,
.id_table = cm36651_id,
};
module_i2c_driver(cm36651_driver);
MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
MODULE_DESCRIPTION("CM36651 proximity/ambient light sensor driver");
MODULE_LICENSE("GPL v2");
