/* * vcnl4000.c - Support for Vishay VCNL4000 combined ambient light and * proximity sensor * * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net> * * 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 (7-bit I2C slave address 0x13) * * TODO: * allow to adjust IR current * proximity threshold and event handling */ #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_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 */ /* Bit masks for COMMAND register */ #define VCNL4000_AL_RDY 0x40 /* ALS data ready? */ #define VCNL4000_PS_RDY 0x20 /* proximity data ready? */ #define VCNL4000_AL_OD 0x10 /* start on-demand ALS measurement */ #define VCNL4000_PS_OD 0x08 /* start on-demand proximity measurement */ struct vcnl4000_data { struct i2c_client *client; }; static const struct i2c_device_id vcnl4000_id[] = { { "vcnl4000", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, vcnl4000_id); static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask, u8 rdy_mask, u8 data_reg, int *val) { int tries = 20; u16 buf; int ret; ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, req_mask); if (ret < 0) return ret; /* wait for data to become ready */ while (tries--) { ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND); if (ret < 0) return ret; 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"); return -EIO; } ret = i2c_smbus_read_i2c_block_data(data->client, data_reg, sizeof(buf), (u8 *) &buf); if (ret < 0) return ret; *val = be16_to_cpu(buf); return 0; } 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 = -EINVAL; struct vcnl4000_data *data = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_RAW: switch (chan->type) { case IIO_LIGHT: ret = vcnl4000_measure(data, VCNL4000_AL_OD, VCNL4000_AL_RDY, VCNL4000_AL_RESULT_HI, val); if (ret < 0) return ret; ret = IIO_VAL_INT; break; case IIO_PROXIMITY: ret = vcnl4000_measure(data, VCNL4000_PS_OD, VCNL4000_PS_RDY, VCNL4000_PS_RESULT_HI, val); if (ret < 0) return ret; ret = IIO_VAL_INT; break; default: break; } break; case IIO_CHAN_INFO_SCALE: if (chan->type == IIO_LIGHT) { *val = 0; *val2 = 250000; ret = IIO_VAL_INT_PLUS_MICRO; } break; default: break; } return ret; } static const struct iio_info vcnl4000_info = { .read_raw = vcnl4000_read_raw, .driver_module = THIS_MODULE, }; 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; ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV); if (ret < 0) return ret; dev_info(&client->dev, "VCNL4000 Ambient light/proximity sensor, Prod %02x, Rev: %02x\n", ret >> 4, ret & 0xf); 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 iio_device_register(indio_dev); } static int vcnl4000_remove(struct i2c_client *client) { iio_device_unregister(i2c_get_clientdata(client)); return 0; } static struct i2c_driver vcnl4000_driver = { .driver = { .name = VCNL4000_DRV_NAME, .owner = THIS_MODULE, }, .probe = vcnl4000_probe, .remove = vcnl4000_remove, .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");