| /* |
| * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4040/4200 combined ambient |
| * light and proximity sensor |
| * |
| * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net> |
| * Copyright 2019 Pursim SPC |
| * |
| * 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. |
| * |
| * IIO driver for: |
| * VCNL4000/10/20 (7-bit I2C slave address 0x13) |
| * VCNL4040 (7-bit I2C slave address 0x60) |
| * VCNL4200 (7-bit I2C slave address 0x51) |
| * |
| * TODO: |
| * allow to adjust IR current |
| * proximity threshold and event handling |
| * periodic ALS/proximity measurement (VCNL4010/20) |
| * interrupts (VCNL4010/20/40, VCNL4200) |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/i2c.h> |
| #include <linux/err.h> |
| #include <linux/delay.h> |
| |
| #include <linux/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| |
| #define VCNL4000_DRV_NAME "vcnl4000" |
| #define VCNL4000_PROD_ID 0x01 |
| #define VCNL4010_PROD_ID 0x02 /* for VCNL4020, VCNL4010 */ |
| #define VCNL4040_PROD_ID 0x86 |
| #define VCNL4200_PROD_ID 0x58 |
| |
| #define VCNL4000_COMMAND 0x80 /* Command register */ |
| #define VCNL4000_PROD_REV 0x81 /* Product ID and Revision ID */ |
| #define VCNL4000_LED_CURRENT 0x83 /* IR LED current for proximity mode */ |
| #define VCNL4000_AL_PARAM 0x84 /* Ambient light parameter register */ |
| #define VCNL4000_AL_RESULT_HI 0x85 /* Ambient light result register, MSB */ |
| #define VCNL4000_AL_RESULT_LO 0x86 /* Ambient light result register, LSB */ |
| #define VCNL4000_PS_RESULT_HI 0x87 /* Proximity result register, MSB */ |
| #define VCNL4000_PS_RESULT_LO 0x88 /* Proximity result register, LSB */ |
| #define VCNL4000_PS_MEAS_FREQ 0x89 /* Proximity test signal frequency */ |
| #define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */ |
| |
| #define VCNL4200_AL_CONF 0x00 /* Ambient light configuration */ |
| #define VCNL4200_PS_CONF1 0x03 /* Proximity configuration */ |
| #define VCNL4200_PS_DATA 0x08 /* Proximity data */ |
| #define VCNL4200_AL_DATA 0x09 /* Ambient light data */ |
| #define VCNL4200_DEV_ID 0x0e /* Device ID, slave address and version */ |
| |
| #define VCNL4040_DEV_ID 0x0c /* Device ID and version */ |
| |
| /* Bit masks for COMMAND register */ |
| #define VCNL4000_AL_RDY BIT(6) /* ALS data ready? */ |
| #define VCNL4000_PS_RDY BIT(5) /* proximity data ready? */ |
| #define VCNL4000_AL_OD BIT(4) /* start on-demand ALS measurement */ |
| #define VCNL4000_PS_OD BIT(3) /* start on-demand proximity measurement */ |
| |
| enum vcnl4000_device_ids { |
| VCNL4000, |
| VCNL4010, |
| VCNL4040, |
| VCNL4200, |
| }; |
| |
| struct vcnl4200_channel { |
| u8 reg; |
| ktime_t last_measurement; |
| ktime_t sampling_rate; |
| struct mutex lock; |
| }; |
| |
| struct vcnl4000_data { |
| struct i2c_client *client; |
| enum vcnl4000_device_ids id; |
| int rev; |
| int al_scale; |
| const struct vcnl4000_chip_spec *chip_spec; |
| struct mutex vcnl4000_lock; |
| struct vcnl4200_channel vcnl4200_al; |
| struct vcnl4200_channel vcnl4200_ps; |
| }; |
| |
| struct vcnl4000_chip_spec { |
| const char *prod; |
| int (*init)(struct vcnl4000_data *data); |
| int (*measure_light)(struct vcnl4000_data *data, int *val); |
| int (*measure_proximity)(struct vcnl4000_data *data, int *val); |
| }; |
| |
| static const struct i2c_device_id vcnl4000_id[] = { |
| { "vcnl4000", VCNL4000 }, |
| { "vcnl4010", VCNL4010 }, |
| { "vcnl4020", VCNL4010 }, |
| { "vcnl4040", VCNL4040 }, |
| { "vcnl4200", VCNL4200 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, vcnl4000_id); |
| |
| static int vcnl4000_init(struct vcnl4000_data *data) |
| { |
| int ret, prod_id; |
| |
| ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV); |
| if (ret < 0) |
| return ret; |
| |
| prod_id = ret >> 4; |
| switch (prod_id) { |
| case VCNL4000_PROD_ID: |
| if (data->id != VCNL4000) |
| dev_warn(&data->client->dev, |
| "wrong device id, use vcnl4000"); |
| break; |
| case VCNL4010_PROD_ID: |
| if (data->id != VCNL4010) |
| dev_warn(&data->client->dev, |
| "wrong device id, use vcnl4010/4020"); |
| break; |
| default: |
| return -ENODEV; |
| } |
| |
| data->rev = ret & 0xf; |
| data->al_scale = 250000; |
| mutex_init(&data->vcnl4000_lock); |
| |
| return 0; |
| }; |
| |
| static int vcnl4200_init(struct vcnl4000_data *data) |
| { |
| int ret, id; |
| |
| ret = i2c_smbus_read_word_data(data->client, VCNL4200_DEV_ID); |
| if (ret < 0) |
| return ret; |
| |
| id = ret & 0xff; |
| |
| if (id != VCNL4200_PROD_ID) { |
| ret = i2c_smbus_read_word_data(data->client, VCNL4040_DEV_ID); |
| if (ret < 0) |
| return ret; |
| |
| id = ret & 0xff; |
| |
| if (id != VCNL4040_PROD_ID) |
| return -ENODEV; |
| } |
| |
| dev_dbg(&data->client->dev, "device id 0x%x", id); |
| |
| data->rev = (ret >> 8) & 0xf; |
| |
| /* Set defaults and enable both channels */ |
| ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF, 0); |
| if (ret < 0) |
| return ret; |
| ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1, 0); |
| if (ret < 0) |
| return ret; |
| |
| data->al_scale = 24000; |
| data->vcnl4200_al.reg = VCNL4200_AL_DATA; |
| data->vcnl4200_ps.reg = VCNL4200_PS_DATA; |
| switch (id) { |
| case VCNL4200_PROD_ID: |
| /* Integration time is 50ms, but the experiments */ |
| /* show 54ms in total. */ |
| data->vcnl4200_al.sampling_rate = ktime_set(0, 54000 * 1000); |
| data->vcnl4200_ps.sampling_rate = ktime_set(0, 4200 * 1000); |
| break; |
| case VCNL4040_PROD_ID: |
| /* Integration time is 80ms, add 10ms. */ |
| data->vcnl4200_al.sampling_rate = ktime_set(0, 100000 * 1000); |
| data->vcnl4200_ps.sampling_rate = ktime_set(0, 100000 * 1000); |
| break; |
| } |
| data->vcnl4200_al.last_measurement = ktime_set(0, 0); |
| data->vcnl4200_ps.last_measurement = ktime_set(0, 0); |
| mutex_init(&data->vcnl4200_al.lock); |
| mutex_init(&data->vcnl4200_ps.lock); |
| |
| return 0; |
| }; |
| |
| static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask, |
| u8 rdy_mask, u8 data_reg, int *val) |
| { |
| int tries = 20; |
| __be16 buf; |
| int ret; |
| |
| mutex_lock(&data->vcnl4000_lock); |
| |
| ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, |
| req_mask); |
| if (ret < 0) |
| goto fail; |
| |
| /* wait for data to become ready */ |
| while (tries--) { |
| ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND); |
| if (ret < 0) |
| goto fail; |
| if (ret & rdy_mask) |
| break; |
| msleep(20); /* measurement takes up to 100 ms */ |
| } |
| |
| if (tries < 0) { |
| dev_err(&data->client->dev, |
| "vcnl4000_measure() failed, data not ready\n"); |
| ret = -EIO; |
| goto fail; |
| } |
| |
| ret = i2c_smbus_read_i2c_block_data(data->client, |
| data_reg, sizeof(buf), (u8 *) &buf); |
| if (ret < 0) |
| goto fail; |
| |
| mutex_unlock(&data->vcnl4000_lock); |
| *val = be16_to_cpu(buf); |
| |
| return 0; |
| |
| fail: |
| mutex_unlock(&data->vcnl4000_lock); |
| return ret; |
| } |
| |
| static int vcnl4200_measure(struct vcnl4000_data *data, |
| struct vcnl4200_channel *chan, int *val) |
| { |
| int ret; |
| s64 delta; |
| ktime_t next_measurement; |
| |
| mutex_lock(&chan->lock); |
| |
| next_measurement = ktime_add(chan->last_measurement, |
| chan->sampling_rate); |
| delta = ktime_us_delta(next_measurement, ktime_get()); |
| if (delta > 0) |
| usleep_range(delta, delta + 500); |
| chan->last_measurement = ktime_get(); |
| |
| mutex_unlock(&chan->lock); |
| |
| ret = i2c_smbus_read_word_data(data->client, chan->reg); |
| if (ret < 0) |
| return ret; |
| |
| *val = ret; |
| |
| return 0; |
| } |
| |
| static int vcnl4000_measure_light(struct vcnl4000_data *data, int *val) |
| { |
| return vcnl4000_measure(data, |
| VCNL4000_AL_OD, VCNL4000_AL_RDY, |
| VCNL4000_AL_RESULT_HI, val); |
| } |
| |
| static int vcnl4200_measure_light(struct vcnl4000_data *data, int *val) |
| { |
| return vcnl4200_measure(data, &data->vcnl4200_al, val); |
| } |
| |
| static int vcnl4000_measure_proximity(struct vcnl4000_data *data, int *val) |
| { |
| return vcnl4000_measure(data, |
| VCNL4000_PS_OD, VCNL4000_PS_RDY, |
| VCNL4000_PS_RESULT_HI, val); |
| } |
| |
| static int vcnl4200_measure_proximity(struct vcnl4000_data *data, int *val) |
| { |
| return vcnl4200_measure(data, &data->vcnl4200_ps, val); |
| } |
| |
| static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = { |
| [VCNL4000] = { |
| .prod = "VCNL4000", |
| .init = vcnl4000_init, |
| .measure_light = vcnl4000_measure_light, |
| .measure_proximity = vcnl4000_measure_proximity, |
| }, |
| [VCNL4010] = { |
| .prod = "VCNL4010/4020", |
| .init = vcnl4000_init, |
| .measure_light = vcnl4000_measure_light, |
| .measure_proximity = vcnl4000_measure_proximity, |
| }, |
| [VCNL4040] = { |
| .prod = "VCNL4040", |
| .init = vcnl4200_init, |
| .measure_light = vcnl4200_measure_light, |
| .measure_proximity = vcnl4200_measure_proximity, |
| }, |
| [VCNL4200] = { |
| .prod = "VCNL4200", |
| .init = vcnl4200_init, |
| .measure_light = vcnl4200_measure_light, |
| .measure_proximity = vcnl4200_measure_proximity, |
| }, |
| }; |
| |
| static const struct iio_chan_spec vcnl4000_channels[] = { |
| { |
| .type = IIO_LIGHT, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
| BIT(IIO_CHAN_INFO_SCALE), |
| }, { |
| .type = IIO_PROXIMITY, |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
| } |
| }; |
| |
| static int vcnl4000_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, long mask) |
| { |
| int ret; |
| struct vcnl4000_data *data = iio_priv(indio_dev); |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| switch (chan->type) { |
| case IIO_LIGHT: |
| ret = data->chip_spec->measure_light(data, val); |
| if (ret < 0) |
| return ret; |
| return IIO_VAL_INT; |
| case IIO_PROXIMITY: |
| ret = data->chip_spec->measure_proximity(data, val); |
| if (ret < 0) |
| return ret; |
| return IIO_VAL_INT; |
| default: |
| return -EINVAL; |
| } |
| case IIO_CHAN_INFO_SCALE: |
| if (chan->type != IIO_LIGHT) |
| return -EINVAL; |
| |
| *val = 0; |
| *val2 = data->al_scale; |
| return IIO_VAL_INT_PLUS_MICRO; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const struct iio_info vcnl4000_info = { |
| .read_raw = vcnl4000_read_raw, |
| }; |
| |
| static int vcnl4000_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct vcnl4000_data *data; |
| struct iio_dev *indio_dev; |
| 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->id = id->driver_data; |
| data->chip_spec = &vcnl4000_chip_spec_cfg[data->id]; |
| |
| ret = data->chip_spec->init(data); |
| if (ret < 0) |
| return ret; |
| |
| dev_dbg(&client->dev, "%s Ambient light/proximity sensor, Rev: %02x\n", |
| data->chip_spec->prod, data->rev); |
| |
| indio_dev->dev.parent = &client->dev; |
| indio_dev->info = &vcnl4000_info; |
| indio_dev->channels = vcnl4000_channels; |
| indio_dev->num_channels = ARRAY_SIZE(vcnl4000_channels); |
| indio_dev->name = VCNL4000_DRV_NAME; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| |
| return devm_iio_device_register(&client->dev, indio_dev); |
| } |
| |
| static const struct of_device_id vcnl_4000_of_match[] = { |
| { |
| .compatible = "vishay,vcnl4000", |
| .data = "VCNL4000", |
| }, |
| { |
| .compatible = "vishay,vcnl4010", |
| .data = "VCNL4010", |
| }, |
| { |
| .compatible = "vishay,vcnl4010", |
| .data = "VCNL4020", |
| }, |
| { |
| .compatible = "vishay,vcnl4200", |
| .data = "VCNL4200", |
| }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, vcnl_4000_of_match); |
| |
| static struct i2c_driver vcnl4000_driver = { |
| .driver = { |
| .name = VCNL4000_DRV_NAME, |
| .of_match_table = vcnl_4000_of_match, |
| }, |
| .probe = vcnl4000_probe, |
| .id_table = vcnl4000_id, |
| }; |
| |
| module_i2c_driver(vcnl4000_driver); |
| |
| MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); |
| MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver"); |
| MODULE_LICENSE("GPL"); |