672 lines
15 KiB
C
672 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Support for Vishay VCNL3020 proximity sensor on i2c bus.
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* Based on Vishay VCNL4000 driver code.
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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/err.h>
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#include <linux/delay.h>
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#include <linux/regmap.h>
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#include <linux/interrupt.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/events.h>
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#define VCNL3020_PROD_ID 0x21
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#define VCNL_COMMAND 0x80 /* Command register */
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#define VCNL_PROD_REV 0x81 /* Product ID and Revision ID */
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#define VCNL_PROXIMITY_RATE 0x82 /* Rate of Proximity Measurement */
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#define VCNL_LED_CURRENT 0x83 /* IR LED current for proximity mode */
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#define VCNL_PS_RESULT_HI 0x87 /* Proximity result register, MSB */
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#define VCNL_PS_RESULT_LO 0x88 /* Proximity result register, LSB */
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#define VCNL_PS_ICR 0x89 /* Interrupt Control Register */
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#define VCNL_PS_LO_THR_HI 0x8a /* High byte of low threshold value */
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#define VCNL_PS_LO_THR_LO 0x8b /* Low byte of low threshold value */
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#define VCNL_PS_HI_THR_HI 0x8c /* High byte of high threshold value */
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#define VCNL_PS_HI_THR_LO 0x8d /* Low byte of high threshold value */
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#define VCNL_ISR 0x8e /* Interrupt Status Register */
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#define VCNL_PS_MOD_ADJ 0x8f /* Proximity Modulator Timing Adjustment */
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/* Bit masks for COMMAND register */
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#define VCNL_PS_RDY BIT(5) /* proximity data ready? */
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#define VCNL_PS_OD BIT(3) /* start on-demand proximity
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* measurement
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*/
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/* Enables periodic proximity measurement */
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#define VCNL_PS_EN BIT(1)
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/* Enables state machine and LP oscillator for self timed measurements */
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#define VCNL_PS_SELFTIMED_EN BIT(0)
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/* Bit masks for ICR */
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/* Enable interrupts on low or high thresholds */
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#define VCNL_ICR_THRES_EN BIT(1)
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/* Bit masks for ISR */
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#define VCNL_INT_TH_HI BIT(0) /* High threshold hit */
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#define VCNL_INT_TH_LOW BIT(1) /* Low threshold hit */
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#define VCNL_ON_DEMAND_TIMEOUT_US 100000
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#define VCNL_POLL_US 20000
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static const int vcnl3020_prox_sampling_frequency[][2] = {
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{1, 950000},
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{3, 906250},
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{7, 812500},
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{16, 625000},
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{31, 250000},
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{62, 500000},
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{125, 0},
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{250, 0},
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};
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/**
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* struct vcnl3020_data - vcnl3020 specific data.
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* @regmap: device register map.
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* @dev: vcnl3020 device.
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* @rev: revision id.
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* @lock: lock for protecting access to device hardware registers.
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* @buf: __be16 buffer.
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*/
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struct vcnl3020_data {
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struct regmap *regmap;
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struct device *dev;
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u8 rev;
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struct mutex lock;
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__be16 buf;
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};
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/**
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* struct vcnl3020_property - vcnl3020 property.
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* @name: property name.
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* @reg: i2c register offset.
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* @conversion_func: conversion function.
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*/
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struct vcnl3020_property {
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const char *name;
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u32 reg;
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u32 (*conversion_func)(u32 *val);
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};
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static u32 microamp_to_reg(u32 *val)
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{
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/*
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* An example of conversion from uA to reg val:
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* 200000 uA == 200 mA == 20
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*/
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return *val /= 10000;
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};
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static struct vcnl3020_property vcnl3020_led_current_property = {
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.name = "vishay,led-current-microamp",
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.reg = VCNL_LED_CURRENT,
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.conversion_func = microamp_to_reg,
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};
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static int vcnl3020_get_and_apply_property(struct vcnl3020_data *data,
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struct vcnl3020_property prop)
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{
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int rc;
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u32 val;
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rc = device_property_read_u32(data->dev, prop.name, &val);
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if (rc)
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return 0;
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if (prop.conversion_func)
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prop.conversion_func(&val);
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rc = regmap_write(data->regmap, prop.reg, val);
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if (rc) {
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dev_err(data->dev, "Error (%d) setting property (%s)\n",
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rc, prop.name);
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}
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return rc;
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}
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static int vcnl3020_init(struct vcnl3020_data *data)
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{
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int rc;
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unsigned int reg;
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rc = regmap_read(data->regmap, VCNL_PROD_REV, ®);
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if (rc) {
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dev_err(data->dev,
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"Error (%d) reading product revision\n", rc);
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return rc;
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}
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if (reg != VCNL3020_PROD_ID) {
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dev_err(data->dev,
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"Product id (%x) did not match vcnl3020 (%x)\n", reg,
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VCNL3020_PROD_ID);
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return -ENODEV;
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}
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data->rev = reg;
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mutex_init(&data->lock);
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return vcnl3020_get_and_apply_property(data,
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vcnl3020_led_current_property);
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};
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static bool vcnl3020_is_in_periodic_mode(struct vcnl3020_data *data)
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{
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int rc;
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unsigned int cmd;
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rc = regmap_read(data->regmap, VCNL_COMMAND, &cmd);
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if (rc) {
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dev_err(data->dev,
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"Error (%d) reading command register\n", rc);
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return false;
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}
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return !!(cmd & VCNL_PS_SELFTIMED_EN);
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}
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static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
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{
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int rc;
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unsigned int reg;
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mutex_lock(&data->lock);
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/* Protect against event capture. */
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if (vcnl3020_is_in_periodic_mode(data)) {
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rc = -EBUSY;
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goto err_unlock;
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}
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rc = regmap_write(data->regmap, VCNL_COMMAND, VCNL_PS_OD);
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if (rc)
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goto err_unlock;
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/* wait for data to become ready */
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rc = regmap_read_poll_timeout(data->regmap, VCNL_COMMAND, reg,
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reg & VCNL_PS_RDY, VCNL_POLL_US,
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VCNL_ON_DEMAND_TIMEOUT_US);
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if (rc) {
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dev_err(data->dev,
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"Error (%d) reading vcnl3020 command register\n", rc);
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goto err_unlock;
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}
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/* high & low result bytes read */
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rc = regmap_bulk_read(data->regmap, VCNL_PS_RESULT_HI, &data->buf,
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sizeof(data->buf));
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if (rc)
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goto err_unlock;
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*val = be16_to_cpu(data->buf);
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err_unlock:
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mutex_unlock(&data->lock);
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return rc;
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}
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static int vcnl3020_read_proxy_samp_freq(struct vcnl3020_data *data, int *val,
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int *val2)
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{
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int rc;
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unsigned int prox_rate;
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rc = regmap_read(data->regmap, VCNL_PROXIMITY_RATE, &prox_rate);
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if (rc)
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return rc;
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if (prox_rate >= ARRAY_SIZE(vcnl3020_prox_sampling_frequency))
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return -EINVAL;
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*val = vcnl3020_prox_sampling_frequency[prox_rate][0];
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*val2 = vcnl3020_prox_sampling_frequency[prox_rate][1];
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return 0;
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}
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static int vcnl3020_write_proxy_samp_freq(struct vcnl3020_data *data, int val,
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int val2)
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{
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unsigned int i;
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int index = -1;
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int rc;
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mutex_lock(&data->lock);
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/* Protect against event capture. */
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if (vcnl3020_is_in_periodic_mode(data)) {
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rc = -EBUSY;
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goto err_unlock;
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}
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for (i = 0; i < ARRAY_SIZE(vcnl3020_prox_sampling_frequency); i++) {
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if (val == vcnl3020_prox_sampling_frequency[i][0] &&
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val2 == vcnl3020_prox_sampling_frequency[i][1]) {
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index = i;
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break;
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}
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}
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if (index < 0) {
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rc = -EINVAL;
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goto err_unlock;
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}
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rc = regmap_write(data->regmap, VCNL_PROXIMITY_RATE, index);
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if (rc)
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dev_err(data->dev,
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"Error (%d) writing proximity rate register\n", rc);
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err_unlock:
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mutex_unlock(&data->lock);
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return rc;
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}
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static bool vcnl3020_is_thr_enabled(struct vcnl3020_data *data)
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{
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int rc;
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unsigned int icr;
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rc = regmap_read(data->regmap, VCNL_PS_ICR, &icr);
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if (rc) {
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dev_err(data->dev,
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"Error (%d) reading ICR register\n", rc);
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return false;
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}
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return !!(icr & VCNL_ICR_THRES_EN);
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}
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static int vcnl3020_read_event(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int *val, int *val2)
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{
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int rc;
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struct vcnl3020_data *data = iio_priv(indio_dev);
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switch (info) {
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case IIO_EV_INFO_VALUE:
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switch (dir) {
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case IIO_EV_DIR_RISING:
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rc = regmap_bulk_read(data->regmap, VCNL_PS_HI_THR_HI,
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&data->buf, sizeof(data->buf));
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if (rc < 0)
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return rc;
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*val = be16_to_cpu(data->buf);
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return IIO_VAL_INT;
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case IIO_EV_DIR_FALLING:
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rc = regmap_bulk_read(data->regmap, VCNL_PS_LO_THR_HI,
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&data->buf, sizeof(data->buf));
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if (rc < 0)
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return rc;
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*val = be16_to_cpu(data->buf);
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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default:
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return -EINVAL;
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}
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}
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static int vcnl3020_write_event(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int val, int val2)
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{
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int rc;
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struct vcnl3020_data *data = iio_priv(indio_dev);
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mutex_lock(&data->lock);
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switch (info) {
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case IIO_EV_INFO_VALUE:
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switch (dir) {
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case IIO_EV_DIR_RISING:
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/* 16 bit word/ low * high */
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data->buf = cpu_to_be16(val);
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rc = regmap_bulk_write(data->regmap, VCNL_PS_HI_THR_HI,
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&data->buf, sizeof(data->buf));
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if (rc < 0)
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goto err_unlock;
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rc = IIO_VAL_INT;
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goto err_unlock;
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case IIO_EV_DIR_FALLING:
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data->buf = cpu_to_be16(val);
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rc = regmap_bulk_write(data->regmap, VCNL_PS_LO_THR_HI,
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&data->buf, sizeof(data->buf));
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if (rc < 0)
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goto err_unlock;
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rc = IIO_VAL_INT;
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goto err_unlock;
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default:
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rc = -EINVAL;
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goto err_unlock;
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}
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default:
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rc = -EINVAL;
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goto err_unlock;
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}
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err_unlock:
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mutex_unlock(&data->lock);
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return rc;
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}
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static int vcnl3020_enable_periodic(struct iio_dev *indio_dev,
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struct vcnl3020_data *data)
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{
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int rc;
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int cmd;
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mutex_lock(&data->lock);
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/* Enable periodic measurement of proximity data. */
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cmd = VCNL_PS_EN | VCNL_PS_SELFTIMED_EN;
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rc = regmap_write(data->regmap, VCNL_COMMAND, cmd);
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if (rc) {
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dev_err(data->dev,
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"Error (%d) writing command register\n", rc);
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goto err_unlock;
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}
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/*
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* Enable interrupts on threshold, for proximity data by
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* default.
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*/
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rc = regmap_write(data->regmap, VCNL_PS_ICR, VCNL_ICR_THRES_EN);
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if (rc)
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dev_err(data->dev,
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"Error (%d) reading ICR register\n", rc);
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err_unlock:
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mutex_unlock(&data->lock);
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return rc;
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}
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static int vcnl3020_disable_periodic(struct iio_dev *indio_dev,
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struct vcnl3020_data *data)
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{
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int rc;
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mutex_lock(&data->lock);
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rc = regmap_write(data->regmap, VCNL_COMMAND, 0);
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if (rc) {
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dev_err(data->dev,
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"Error (%d) writing command register\n", rc);
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goto err_unlock;
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}
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rc = regmap_write(data->regmap, VCNL_PS_ICR, 0);
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if (rc) {
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dev_err(data->dev,
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"Error (%d) writing ICR register\n", rc);
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goto err_unlock;
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}
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/* Clear interrupt flag bit */
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rc = regmap_write(data->regmap, VCNL_ISR, 0);
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if (rc)
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dev_err(data->dev,
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"Error (%d) writing ISR register\n", rc);
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err_unlock:
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mutex_unlock(&data->lock);
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return rc;
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}
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static int vcnl3020_config_threshold(struct iio_dev *indio_dev, bool state)
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{
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struct vcnl3020_data *data = iio_priv(indio_dev);
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if (state) {
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return vcnl3020_enable_periodic(indio_dev, data);
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} else {
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if (!vcnl3020_is_thr_enabled(data))
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return 0;
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return vcnl3020_disable_periodic(indio_dev, data);
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}
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}
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static int vcnl3020_write_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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int state)
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{
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switch (chan->type) {
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case IIO_PROXIMITY:
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return vcnl3020_config_threshold(indio_dev, state);
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default:
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return -EINVAL;
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}
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}
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static int vcnl3020_read_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir)
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{
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struct vcnl3020_data *data = iio_priv(indio_dev);
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switch (chan->type) {
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case IIO_PROXIMITY:
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return vcnl3020_is_thr_enabled(data);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_event_spec vcnl3020_event_spec[] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE),
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}, {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_FALLING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE),
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}, {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_EITHER,
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.mask_separate = BIT(IIO_EV_INFO_ENABLE),
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},
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};
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static const struct iio_chan_spec vcnl3020_channels[] = {
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{
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.type = IIO_PROXIMITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.event_spec = vcnl3020_event_spec,
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.num_event_specs = ARRAY_SIZE(vcnl3020_event_spec),
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},
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};
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static int vcnl3020_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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int rc;
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struct vcnl3020_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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rc = vcnl3020_measure_proximity(data, val);
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if (rc)
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return rc;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SAMP_FREQ:
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rc = vcnl3020_read_proxy_samp_freq(data, val, val2);
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if (rc < 0)
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return rc;
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return IIO_VAL_INT_PLUS_MICRO;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int vcnl3020_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct vcnl3020_data *data = iio_priv(indio_dev);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
return vcnl3020_write_proxy_samp_freq(data, val, val2);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int vcnl3020_read_avail(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
const int **vals, int *type, int *length,
|
|
long mask)
|
|
{
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SAMP_FREQ:
|
|
*vals = (int *)vcnl3020_prox_sampling_frequency;
|
|
*type = IIO_VAL_INT_PLUS_MICRO;
|
|
*length = 2 * ARRAY_SIZE(vcnl3020_prox_sampling_frequency);
|
|
return IIO_AVAIL_LIST;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct iio_info vcnl3020_info = {
|
|
.read_raw = vcnl3020_read_raw,
|
|
.write_raw = vcnl3020_write_raw,
|
|
.read_avail = vcnl3020_read_avail,
|
|
.read_event_value = vcnl3020_read_event,
|
|
.write_event_value = vcnl3020_write_event,
|
|
.read_event_config = vcnl3020_read_event_config,
|
|
.write_event_config = vcnl3020_write_event_config,
|
|
};
|
|
|
|
static const struct regmap_config vcnl3020_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = VCNL_PS_MOD_ADJ,
|
|
};
|
|
|
|
static irqreturn_t vcnl3020_handle_irq_thread(int irq, void *p)
|
|
{
|
|
struct iio_dev *indio_dev = p;
|
|
struct vcnl3020_data *data = iio_priv(indio_dev);
|
|
unsigned int isr;
|
|
int rc;
|
|
|
|
rc = regmap_read(data->regmap, VCNL_ISR, &isr);
|
|
if (rc) {
|
|
dev_err(data->dev, "Error (%d) reading reg (0x%x)\n",
|
|
rc, VCNL_ISR);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
if (!(isr & VCNL_ICR_THRES_EN))
|
|
return IRQ_NONE;
|
|
|
|
iio_push_event(indio_dev,
|
|
IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
|
|
IIO_EV_TYPE_THRESH,
|
|
IIO_EV_DIR_RISING),
|
|
iio_get_time_ns(indio_dev));
|
|
|
|
rc = regmap_write(data->regmap, VCNL_ISR, isr & VCNL_ICR_THRES_EN);
|
|
if (rc)
|
|
dev_err(data->dev, "Error (%d) writing in reg (0x%x)\n",
|
|
rc, VCNL_ISR);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int vcnl3020_probe(struct i2c_client *client)
|
|
{
|
|
struct vcnl3020_data *data;
|
|
struct iio_dev *indio_dev;
|
|
struct regmap *regmap;
|
|
int rc;
|
|
|
|
regmap = devm_regmap_init_i2c(client, &vcnl3020_regmap_config);
|
|
if (IS_ERR(regmap)) {
|
|
dev_err(&client->dev, "regmap_init failed\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
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->regmap = regmap;
|
|
data->dev = &client->dev;
|
|
|
|
rc = vcnl3020_init(data);
|
|
if (rc)
|
|
return rc;
|
|
|
|
indio_dev->info = &vcnl3020_info;
|
|
indio_dev->channels = vcnl3020_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(vcnl3020_channels);
|
|
indio_dev->name = "vcnl3020";
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
if (client->irq) {
|
|
rc = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, vcnl3020_handle_irq_thread,
|
|
IRQF_ONESHOT, indio_dev->name,
|
|
indio_dev);
|
|
if (rc) {
|
|
dev_err(&client->dev,
|
|
"Error (%d) irq request failed (%u)\n", rc,
|
|
client->irq);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
|
}
|
|
|
|
static const struct of_device_id vcnl3020_of_match[] = {
|
|
{
|
|
.compatible = "vishay,vcnl3020",
|
|
},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, vcnl3020_of_match);
|
|
|
|
static struct i2c_driver vcnl3020_driver = {
|
|
.driver = {
|
|
.name = "vcnl3020",
|
|
.of_match_table = vcnl3020_of_match,
|
|
},
|
|
.probe_new = vcnl3020_probe,
|
|
};
|
|
module_i2c_driver(vcnl3020_driver);
|
|
|
|
MODULE_AUTHOR("Ivan Mikhaylov <i.mikhaylov@yadro.com>");
|
|
MODULE_DESCRIPTION("Vishay VCNL3020 proximity sensor driver");
|
|
MODULE_LICENSE("GPL");
|