iio:light: Add support for STMicro VL6180 sensor
This patch adds support for STMicro VL6180 - ALS, range and proximity sensor. Sensor is capable of measuring the light intensity as well as object distance using TOF (Time of Flight) technology. Signed-off-by: Manivannan Sadhasivam <manivannanece23@gmail.com> Signed-off-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Manivannan Sadhasivam
Jonathan Cameron
Родитель
e29e7b3236
Коммит
5e7f47e495
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@ -0,0 +1,15 @@
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STMicro VL6180 - ALS, range and proximity sensor
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Link to datasheet: http://www.st.com/resource/en/datasheet/vl6180x.pdf
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Required properties:
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-compatible: should be "st,vl6180"
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-reg: the I2C address of the sensor
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Example:
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vl6180@29 {
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compatible = "st,vl6180";
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reg = <0x29>;
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};
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@ -405,4 +405,14 @@ config VEML6070
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To compile this driver as a module, choose M here: the
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module will be called veml6070.
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config VL6180
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tristate "VL6180 ALS, range and proximity sensor"
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depends on I2C
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help
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Say Y here if you want to build a driver for the STMicroelectronics
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VL6180 combined ambient light, range and proximity sensor.
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To compile this driver as a module, choose M here: the
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module will be called vl6180.
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endmenu
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@ -38,3 +38,4 @@ obj-$(CONFIG_TSL4531) += tsl4531.o
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obj-$(CONFIG_US5182D) += us5182d.o
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obj-$(CONFIG_VCNL4000) += vcnl4000.o
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obj-$(CONFIG_VEML6070) += veml6070.o
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obj-$(CONFIG_VL6180) += vl6180.o
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@ -0,0 +1,543 @@
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/*
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* vl6180.c - Support for STMicroelectronics VL6180 ALS, range and proximity
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* sensor
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*
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* Copyright 2017 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
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* Copyright 2017 Manivannan Sadhasivam <manivannanece23@gmail.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* IIO driver for VL6180 (7-bit I2C slave address 0x29)
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*
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* Range: 0 to 100mm
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* ALS: < 1 Lux up to 100 kLux
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* IR: 850nm
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*
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* TODO: irq, threshold events, continuous mode, hardware buffer
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define VL6180_DRV_NAME "vl6180"
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/* Device identification register and value */
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#define VL6180_MODEL_ID 0x000
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#define VL6180_MODEL_ID_VAL 0xb4
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/* Configuration registers */
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#define VL6180_INTR_CONFIG 0x014
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#define VL6180_INTR_CLEAR 0x015
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#define VL6180_OUT_OF_RESET 0x016
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#define VL6180_HOLD 0x017
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#define VL6180_RANGE_START 0x018
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#define VL6180_ALS_START 0x038
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#define VL6180_ALS_GAIN 0x03f
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#define VL6180_ALS_IT 0x040
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/* Status registers */
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#define VL6180_RANGE_STATUS 0x04d
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#define VL6180_ALS_STATUS 0x04e
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#define VL6180_INTR_STATUS 0x04f
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/* Result value registers */
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#define VL6180_ALS_VALUE 0x050
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#define VL6180_RANGE_VALUE 0x062
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#define VL6180_RANGE_RATE 0x066
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/* bits of the RANGE_START and ALS_START register */
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#define VL6180_MODE_CONT BIT(1) /* continuous mode */
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#define VL6180_STARTSTOP BIT(0) /* start measurement, auto-reset */
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/* bits of the INTR_STATUS and INTR_CONFIG register */
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#define VL6180_ALS_READY BIT(5)
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#define VL6180_RANGE_READY BIT(2)
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/* bits of the INTR_CLEAR register */
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#define VL6180_CLEAR_ERROR BIT(2)
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#define VL6180_CLEAR_ALS BIT(1)
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#define VL6180_CLEAR_RANGE BIT(0)
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/* bits of the HOLD register */
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#define VL6180_HOLD_ON BIT(0)
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/* default value for the ALS_IT register */
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#define VL6180_ALS_IT_100 0x63 /* 100 ms */
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/* values for the ALS_GAIN register */
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#define VL6180_ALS_GAIN_1 0x46
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#define VL6180_ALS_GAIN_1_25 0x45
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#define VL6180_ALS_GAIN_1_67 0x44
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#define VL6180_ALS_GAIN_2_5 0x43
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#define VL6180_ALS_GAIN_5 0x42
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#define VL6180_ALS_GAIN_10 0x41
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#define VL6180_ALS_GAIN_20 0x40
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#define VL6180_ALS_GAIN_40 0x47
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struct vl6180_data {
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struct i2c_client *client;
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struct mutex lock;
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};
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enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX };
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/**
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* struct vl6180_chan_regs - Registers for accessing channels
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* @drdy_mask: Data ready bit in status register
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* @start_reg: Conversion start register
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* @value_reg: Result value register
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* @word: Register word length
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*/
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struct vl6180_chan_regs {
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u8 drdy_mask;
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u16 start_reg, value_reg;
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bool word;
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};
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static const struct vl6180_chan_regs vl6180_chan_regs_table[] = {
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[VL6180_ALS] = {
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.drdy_mask = VL6180_ALS_READY,
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.start_reg = VL6180_ALS_START,
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.value_reg = VL6180_ALS_VALUE,
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.word = true,
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},
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[VL6180_RANGE] = {
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.drdy_mask = VL6180_RANGE_READY,
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.start_reg = VL6180_RANGE_START,
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.value_reg = VL6180_RANGE_VALUE,
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.word = false,
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},
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[VL6180_PROX] = {
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.drdy_mask = VL6180_RANGE_READY,
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.start_reg = VL6180_RANGE_START,
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.value_reg = VL6180_RANGE_RATE,
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.word = true,
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},
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};
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static int vl6180_read(struct i2c_client *client, u16 cmd, void *databuf,
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u8 len)
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{
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__be16 cmdbuf = cpu_to_be16(cmd);
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struct i2c_msg msgs[2] = {
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{ .addr = client->addr, .len = sizeof(cmdbuf), .buf = (u8 *) &cmdbuf },
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{ .addr = client->addr, .len = len, .buf = databuf,
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.flags = I2C_M_RD } };
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int ret;
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0)
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dev_err(&client->dev, "failed reading register 0x%04x\n", cmd);
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return ret;
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}
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static int vl6180_read_byte(struct i2c_client *client, u16 cmd)
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{
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u8 data;
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int ret;
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ret = vl6180_read(client, cmd, &data, sizeof(data));
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if (ret < 0)
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return ret;
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return data;
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}
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static int vl6180_read_word(struct i2c_client *client, u16 cmd)
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{
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__be16 data;
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int ret;
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ret = vl6180_read(client, cmd, &data, sizeof(data));
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if (ret < 0)
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return ret;
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return be16_to_cpu(data);
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}
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static int vl6180_write_byte(struct i2c_client *client, u16 cmd, u8 val)
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{
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u8 buf[3];
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struct i2c_msg msgs[1] = {
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{ .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
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int ret;
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buf[0] = cmd >> 8;
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buf[1] = cmd & 0xff;
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buf[2] = val;
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0) {
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dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
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return ret;
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}
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return 0;
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}
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static int vl6180_write_word(struct i2c_client *client, u16 cmd, u16 val)
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{
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__be16 buf[2];
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struct i2c_msg msgs[1] = {
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{ .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
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int ret;
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buf[0] = cpu_to_be16(cmd);
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buf[1] = cpu_to_be16(val);
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0) {
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dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
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return ret;
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}
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return 0;
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}
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static int vl6180_measure(struct vl6180_data *data, int addr)
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{
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struct i2c_client *client = data->client;
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int tries = 20, ret;
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u16 value;
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mutex_lock(&data->lock);
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/* Start single shot measurement */
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ret = vl6180_write_byte(client,
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vl6180_chan_regs_table[addr].start_reg, VL6180_STARTSTOP);
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if (ret < 0)
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goto fail;
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while (tries--) {
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ret = vl6180_read_byte(client, VL6180_INTR_STATUS);
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if (ret < 0)
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goto fail;
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if (ret & vl6180_chan_regs_table[addr].drdy_mask)
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break;
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msleep(20);
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}
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if (tries < 0) {
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ret = -EIO;
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goto fail;
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}
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/* Read result value from appropriate registers */
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ret = vl6180_chan_regs_table[addr].word ?
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vl6180_read_word(client, vl6180_chan_regs_table[addr].value_reg) :
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vl6180_read_byte(client, vl6180_chan_regs_table[addr].value_reg);
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if (ret < 0)
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goto fail;
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value = ret;
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/* Clear the interrupt flag after data read */
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ret = vl6180_write_byte(client, VL6180_INTR_CLEAR,
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VL6180_CLEAR_ERROR | VL6180_CLEAR_ALS | VL6180_CLEAR_RANGE);
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if (ret < 0)
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goto fail;
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ret = value;
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fail:
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mutex_unlock(&data->lock);
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return ret;
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}
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static const struct iio_chan_spec vl6180_channels[] = {
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{
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.type = IIO_LIGHT,
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.address = VL6180_ALS,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_INT_TIME) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_HARDWAREGAIN),
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}, {
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.type = IIO_DISTANCE,
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.address = VL6180_RANGE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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}, {
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.type = IIO_PROXIMITY,
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.address = VL6180_PROX,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}
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};
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/*
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* Columns 3 & 4 represent the same value in decimal and hex notations.
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* Kept in order to avoid the datatype conversion while reading the
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* hardware_gain.
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*/
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static const int vl6180_als_gain[8][4] = {
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{ 1, 0, 70, VL6180_ALS_GAIN_1 },
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{ 1, 250000, 69, VL6180_ALS_GAIN_1_25 },
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{ 1, 670000, 68, VL6180_ALS_GAIN_1_67 },
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{ 2, 500000, 67, VL6180_ALS_GAIN_2_5 },
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{ 5, 0, 66, VL6180_ALS_GAIN_5 },
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{ 10, 0, 65, VL6180_ALS_GAIN_10 },
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{ 20, 0, 64, VL6180_ALS_GAIN_20 },
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{ 40, 0, 71, VL6180_ALS_GAIN_40 }
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};
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static int vl6180_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct vl6180_data *data = iio_priv(indio_dev);
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int ret, i;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = vl6180_measure(data, chan->address);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME:
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ret = vl6180_read_word(data->client, VL6180_ALS_IT);
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if (ret < 0)
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return ret;
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*val = 0; /* 1 count = 1ms (0 = 1ms) */
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*val2 = (ret + 1) * 1000; /* convert to seconds */
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|
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return IIO_VAL_INT_PLUS_MICRO;
|
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_LIGHT:
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*val = 0; /* one ALS count is 0.32 Lux */
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*val2 = 320000;
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break;
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case IIO_DISTANCE:
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*val = 0; /* sensor reports mm, scale to meter */
|
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*val2 = 1000;
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break;
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default:
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return -EINVAL;
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}
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return IIO_VAL_INT_PLUS_MICRO;
|
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case IIO_CHAN_INFO_HARDWAREGAIN:
|
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ret = vl6180_read_byte(data->client, VL6180_ALS_GAIN);
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if (ret < 0)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(vl6180_als_gain); i++) {
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if (ret == vl6180_als_gain[i][2]) {
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*val = vl6180_als_gain[i][0];
|
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*val2 = vl6180_als_gain[i][1];
|
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}
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}
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return IIO_VAL_INT_PLUS_MICRO;
|
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default:
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return -EINVAL;
|
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}
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}
|
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|
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static IIO_CONST_ATTR(als_gain_available, "1 1.25 1.67 2.5 5 10 20 40");
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static struct attribute *vl6180_attributes[] = {
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&iio_const_attr_als_gain_available.dev_attr.attr,
|
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NULL
|
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};
|
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|
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static const struct attribute_group vl6180_attribute_group = {
|
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.attrs = vl6180_attributes,
|
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};
|
||||
|
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/* HOLD is needed before updating any config registers */
|
||||
static int vl6180_hold(struct vl6180_data *data, bool hold)
|
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{
|
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return vl6180_write_byte(data->client, VL6180_HOLD,
|
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hold ? VL6180_HOLD_ON : 0);
|
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}
|
||||
|
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static int vl6180_set_als_gain(struct vl6180_data *data, int val, int val2)
|
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{
|
||||
int i, ret;
|
||||
|
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for (i = 0; i < ARRAY_SIZE(vl6180_als_gain); i++) {
|
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if (val == vl6180_als_gain[i][0] &&
|
||||
val2 == vl6180_als_gain[i][1]) {
|
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mutex_lock(&data->lock);
|
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ret = vl6180_hold(data, true);
|
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if (ret < 0)
|
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goto fail;
|
||||
ret = vl6180_write_byte(data->client, VL6180_ALS_GAIN,
|
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vl6180_als_gain[i][3]);
|
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fail:
|
||||
vl6180_hold(data, false);
|
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mutex_unlock(&data->lock);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int vl6180_set_it(struct vl6180_data *data, int val2)
|
||||
{
|
||||
int ret;
|
||||
|
||||
mutex_lock(&data->lock);
|
||||
ret = vl6180_hold(data, true);
|
||||
if (ret < 0)
|
||||
goto fail;
|
||||
ret = vl6180_write_word(data->client, VL6180_ALS_IT,
|
||||
(val2 - 500) / 1000); /* write value in ms */
|
||||
fail:
|
||||
vl6180_hold(data, false);
|
||||
mutex_unlock(&data->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int vl6180_write_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int val, int val2, long mask)
|
||||
{
|
||||
struct vl6180_data *data = iio_priv(indio_dev);
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_INT_TIME:
|
||||
if (val != 0 || val2 < 500 || val2 >= 512500)
|
||||
return -EINVAL;
|
||||
|
||||
return vl6180_set_it(data, val2);
|
||||
case IIO_CHAN_INFO_HARDWAREGAIN:
|
||||
if (chan->type != IIO_LIGHT)
|
||||
return -EINVAL;
|
||||
|
||||
return vl6180_set_als_gain(data, val, val2);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct iio_info vl6180_info = {
|
||||
.read_raw = vl6180_read_raw,
|
||||
.write_raw = vl6180_write_raw,
|
||||
.attrs = &vl6180_attribute_group,
|
||||
.driver_module = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int vl6180_init(struct vl6180_data *data)
|
||||
{
|
||||
struct i2c_client *client = data->client;
|
||||
int ret;
|
||||
|
||||
ret = vl6180_read_byte(client, VL6180_MODEL_ID);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (ret != VL6180_MODEL_ID_VAL) {
|
||||
dev_err(&client->dev, "invalid model ID %02x\n", ret);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
ret = vl6180_hold(data, true);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = vl6180_read_byte(client, VL6180_OUT_OF_RESET);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* Detect false reset condition here. This bit is always set when the
|
||||
* system comes out of reset.
|
||||
*/
|
||||
if (ret != 0x01)
|
||||
dev_info(&client->dev, "device is not fresh out of reset\n");
|
||||
|
||||
/* Enable ALS and Range ready interrupts */
|
||||
ret = vl6180_write_byte(client, VL6180_INTR_CONFIG,
|
||||
VL6180_ALS_READY | VL6180_RANGE_READY);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* ALS integration time: 100ms */
|
||||
ret = vl6180_write_word(client, VL6180_ALS_IT, VL6180_ALS_IT_100);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* ALS gain: 1 */
|
||||
ret = vl6180_write_byte(client, VL6180_ALS_GAIN, VL6180_ALS_GAIN_1);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = vl6180_write_byte(client, VL6180_OUT_OF_RESET, 0x00);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return vl6180_hold(data, false);
|
||||
}
|
||||
|
||||
static int vl6180_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct vl6180_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;
|
||||
mutex_init(&data->lock);
|
||||
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->info = &vl6180_info;
|
||||
indio_dev->channels = vl6180_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(vl6180_channels);
|
||||
indio_dev->name = VL6180_DRV_NAME;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
ret = vl6180_init(data);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return devm_iio_device_register(&client->dev, indio_dev);
|
||||
}
|
||||
|
||||
static const struct of_device_id vl6180_of_match[] = {
|
||||
{ .compatible = "st,vl6180", },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, vl6180_of_match);
|
||||
|
||||
static const struct i2c_device_id vl6180_id[] = {
|
||||
{ "vl6180", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, vl6180_id);
|
||||
|
||||
static struct i2c_driver vl6180_driver = {
|
||||
.driver = {
|
||||
.name = VL6180_DRV_NAME,
|
||||
.of_match_table = of_match_ptr(vl6180_of_match),
|
||||
},
|
||||
.probe = vl6180_probe,
|
||||
.id_table = vl6180_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(vl6180_driver);
|
||||
|
||||
MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
|
||||
MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>");
|
||||
MODULE_DESCRIPTION("STMicro VL6180 ALS, range and proximity sensor driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
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