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655 lines
15 KiB
655 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0
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/*
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* UCS12CM0 illuminance and correlated color temperature sensor
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*
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* Copyright (C) 2022-2025 ROCKCHIP.
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* Author: Jason Zhang <jason.zhang@rock-chips.com>
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*
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* IIO driver for UCS12CM0 (7-bit I2C slave address 0x38)
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*/
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#include <linux/module.h>
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#include <linux/mod_devicetable.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/util_macros.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/interrupt.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/kfifo_buf.h>
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#include <linux/iio/buffer.h>
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#define UCS12CM0_SYS_CTRL 0x00
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#define UCS12CM0_INT_CTRL 0x01
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#define UCS12CM0_INT_FLAG 0x02
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#define UCS12CM0_WAIT 0x03
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#define UCS12CM0_ALS_GAIN 0x04
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#define UCS12CM0_ALS_TIME 0x05
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#define UCS12CM0_PS_LED 0x06
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#define UCS12CM0_PS_GAIN 0x07
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#define UCS12CM0_PS_PULSE 0x08
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#define UCS12CM0_PS_TIME 0x09
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#define UCS12CM0_PS_AVERAGE 0x0a
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#define UCS12CM0_PS_PERSIST 0x0b
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#define UCS12CM0_ALS_THDLL 0x0c
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#define UCS12CM0_ALS_THDLH 0x0d
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#define UCS12CM0_ALS_THDHL 0x0e
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#define UCS12CM0_ALS_THDHH 0x0f
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#define UCS12CM0_PS_THDLL 0x10
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#define UCS12CM0_PS_THDLH 0x11
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#define UCS12CM0_PS_THDHL 0x12
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#define UCS12CM0_PS_THDHH 0x13
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#define UCS12CM0_PS_OFFSET_L 0x14
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#define UCS12CM0_PS_OFFSET_H 0x15
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#define UCS12CM0_PS_DATA_L 0x18
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#define UCS12CM0_PS_DATA_H 0x19
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#define UCS12CM0_CLS_R_DATA_L 0x1c
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#define UCS12CM0_CLS_R_DATA_H 0x1d
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#define UCS12CM0_CLS_G_DATA_L 0x1e
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#define UCS12CM0_CLS_G_DATA_H 0x1f
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#define UCS12CM0_CLS_B_DATA_L 0x20
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#define UCS12CM0_CLS_B_DATA_H 0x21
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#define UCS12CM0_CLS_W_DATA_L 0x22
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#define UCS12CM0_CLS_W_DATA_H 0x23
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#define UCS12CM0_IR_DATA_L 0x24
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#define UCS12CM0_IR_DATA_H 0x25
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#define UCS12CM0_ID 0xbc
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/* bis of the SYS_CTRL register */
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#define UCS12CM0_EN_CLS BIT(0) /* Enables CLS function */
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#define UCS12CM0_EN_IR BIT(1) /* Enables IR function */
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#define UCS12CM0_EN_FRST BIT(5) /* Enables Brown Out Reset circuit */
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#define UCS12CM0_EN_WAIT BIT(6) /* Waiting time will be inserted between two
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* measurements
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*/
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#define UCS12CM0_SWRST BIT(7) /* Software reset. Reset all register to
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* default value
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*/
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/* bis of the INT_FLAG register */
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#define UCS12CM0_INT_CLS BIT(0) /* CLS Interrupt flag. It correlation with
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* sensor data and CLS high/low threshold.
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* Write zero to clear the flag.
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*/
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#define UCS12CM0_INT_DATA BIT(6)/* It shows if any data is invalid after
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* completion of each conversion cycle. This
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* bit is read-only.
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*/
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#define UCS12CM0_INT_POR BIT(7) /* Power-On-Reset Interrupt flag trigger the
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* INT pin when the flag sets to one. Write
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* zero to clear the flag.
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*/
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#define UCS12CM0_CCT_CHANNEL(_si, _mod) { \
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.type = IIO_CCT, \
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.address = _si, \
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.channel2 = _mod, \
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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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BIT(IIO_CHAN_INFO_AVERAGE_RAW), \
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.modified = 1, \
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.scan_index = _si, \
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.scan_type = { \
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.sign = 'u', \
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.realbits = 16, \
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.storagebits = 16, \
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}, \
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}
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enum {
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UCS12CM0_CCT_READ,
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UCS12CM0_CCT_GREEN,
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UCS12CM0_CCT_BLUE,
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UCS12CM0_CCT_WHITE,
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UCS12CM0_CCT_ALL
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};
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struct ucs12cm0_scan {
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u16 chans[4];
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/* Ensure natural alignment of timestamp */
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s64 timestamp;
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};
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struct ucs12cm0_data {
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struct i2c_client *client;
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int calibrated;
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u32 raw[UCS12CM0_CCT_ALL];
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u32 average[UCS12CM0_CCT_ALL];
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};
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static const u8 ucs12cm0_chan_regs[UCS12CM0_CCT_ALL] = {
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UCS12CM0_CLS_R_DATA_L,
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UCS12CM0_CLS_G_DATA_L,
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UCS12CM0_CLS_B_DATA_L,
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UCS12CM0_CLS_W_DATA_L
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};
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static const struct iio_chan_spec ucs12cm0_channels[] = {
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UCS12CM0_CCT_CHANNEL(UCS12CM0_CCT_READ, IIO_MOD_LIGHT_RED),
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UCS12CM0_CCT_CHANNEL(UCS12CM0_CCT_GREEN, IIO_MOD_LIGHT_GREEN),
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UCS12CM0_CCT_CHANNEL(UCS12CM0_CCT_BLUE, IIO_MOD_LIGHT_BLUE),
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UCS12CM0_CCT_CHANNEL(UCS12CM0_CCT_WHITE, IIO_MOD_LIGHT_CLEAR),
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static int ucs12cm0_read(struct i2c_client *client, u8 cmd, void *databuf,
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u8 len)
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{
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struct i2c_msg msgs[2] = {
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{
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.addr = client->addr,
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.len = sizeof(cmd),
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.buf = (u8 *) &cmd
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}, {
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.addr = client->addr,
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.len = len,
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.buf = databuf,
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.flags = I2C_M_RD
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}
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};
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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 ucs12cm0_read_byte(struct i2c_client *client, u8 cmd)
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{
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u8 data;
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int ret;
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ret = ucs12cm0_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 ucs12cm0_read_word(struct i2c_client *client, u8 cmd)
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{
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__le16 data;
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int ret;
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ret = ucs12cm0_read(client, cmd, &data, sizeof(data));
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if (ret < 0)
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return ret;
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return le16_to_cpu(data);
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}
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static int ucs12cm0_read_average(struct ucs12cm0_data *data, int chan)
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{
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u8 cmd;
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int sum = 0;
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int average;
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int i;
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int ret;
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cmd = ucs12cm0_chan_regs[chan];
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for (i = 0; i < 10; ++i) {
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ret = ucs12cm0_read_word(data->client, cmd);
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if (ret < 0)
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return ret;
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sum += ret;
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}
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average = sum / 10;
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return average;
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}
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static int ucs12cm0_write_byte(struct i2c_client *client, u8 cmd, u8 val)
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{
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u8 buf[2];
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struct i2c_msg msgs[1] = {
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{
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.addr = client->addr,
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.len = sizeof(buf),
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.buf = (u8 *) &buf
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}
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};
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int ret;
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buf[0] = cmd;
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buf[1] = 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 ucs12cm0_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 ucs12cm0_data *data = iio_priv(indio_dev);
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u8 cmd;
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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cmd = ucs12cm0_chan_regs[chan->address];
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ret = ucs12cm0_read_word(data->client, cmd);
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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_SCALE:
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if (data->calibrated) {
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*val = data->average[chan->address];
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*val2 = data->raw[chan->address];
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} else {
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*val = 1;
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*val2 = 1;
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}
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return IIO_VAL_FRACTIONAL;
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case IIO_CHAN_INFO_AVERAGE_RAW:
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*val = data->average[chan->address];
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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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}
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static int ucs12cm0_write_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 ucs12cm0_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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data->raw[chan->address] = val;
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return 0;
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case IIO_CHAN_INFO_SCALE:
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return -EPERM;
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case IIO_CHAN_INFO_AVERAGE_RAW:
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return -EPERM;
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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 ucs12cm0_write_raw_get_fmt(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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long mask)
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{
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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return IIO_VAL_FRACTIONAL;
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case IIO_CHAN_INFO_AVERAGE_RAW:
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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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}
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static ssize_t start_calibrating_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ucs12cm0_data *data = iio_priv(indio_dev);
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int i;
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long chans = 0;
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int ret;
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if (!strncmp(buf, "red", 3)) {
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set_bit(UCS12CM0_CCT_READ, &chans);
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} else if (!strncmp(buf, "green", 5)) {
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set_bit(UCS12CM0_CCT_GREEN, &chans);
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} else if (!strncmp(buf, "blue", 4)) {
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set_bit(UCS12CM0_CCT_BLUE, &chans);
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} else if (!strncmp(buf, "white", 5)) {
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set_bit(UCS12CM0_CCT_WHITE, &chans);
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} else if (!strncmp(buf, "all", 3)) {
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set_bit(UCS12CM0_CCT_READ, &chans);
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set_bit(UCS12CM0_CCT_GREEN, &chans);
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set_bit(UCS12CM0_CCT_BLUE, &chans);
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set_bit(UCS12CM0_CCT_WHITE, &chans);
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} else {
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return -EINVAL;
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}
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for_each_set_bit(i, &chans, UCS12CM0_CCT_ALL) {
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if (!data->raw[i])
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return -EPERM;
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dev_info(&data->client->dev, "raw = %d\n",
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data->raw[i]);
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}
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for_each_set_bit(i, &chans, UCS12CM0_CCT_ALL) {
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ret = ucs12cm0_read_average(data, i);
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if (ret < 0)
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return ret;
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else if (ret == 0)
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return -EINVAL;
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data->average[i] = ret;
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dev_info(&data->client->dev, "average = %d\n",
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data->average[i]);
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}
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/*
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* TODO: store the calibration data in the ROM because UCS12CM0
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* doesn't have any rom-related register.
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*/
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data->calibrated = 1;
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return len;
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}
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static IIO_DEVICE_ATTR_WO(start_calibrating, 0);
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static struct attribute *ucs12cm0_attributes[] = {
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&iio_dev_attr_start_calibrating.dev_attr.attr,
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NULL
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};
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static const struct attribute_group ucs12cm0_attribute_group = {
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.attrs = ucs12cm0_attributes,
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};
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static const struct iio_info ucs12cm0_info = {
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.read_raw = ucs12cm0_read_raw,
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.write_raw = ucs12cm0_write_raw,
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.write_raw_get_fmt = ucs12cm0_write_raw_get_fmt,
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.attrs = &ucs12cm0_attribute_group,
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};
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/**
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* ucs12cm0_active - enable or disable the CLS
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* @client: the i2c client used by the driver.
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* @enable: enable/disable the CLS of ucs12cm0.
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*
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* Returns negative errno, else the number of messages executed.
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*/
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static int ucs12cm0_active(struct i2c_client *client, int enable)
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{
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u8 val;
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int ret = 0;
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ret = ucs12cm0_read_byte(client, UCS12CM0_SYS_CTRL);
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if (ret < 0)
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goto out;
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val = ret;
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if (enable)
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val |= UCS12CM0_EN_CLS;
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else
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val &= ~UCS12CM0_EN_CLS;
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ret = ucs12cm0_write_byte(client, UCS12CM0_SYS_CTRL, val);
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if (ret < 0)
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dev_err(&client->dev, "Failed to active sensor\n");
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out:
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return ret;
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}
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static int ucs12cm0_buffer_postenable(struct iio_dev *indio_dev)
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{
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struct ucs12cm0_data *data = iio_priv(indio_dev);
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return ucs12cm0_active(data->client, 1);
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}
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static int ucs12cm0_buffer_predisable(struct iio_dev *indio_dev)
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{
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struct ucs12cm0_data *data = iio_priv(indio_dev);
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return ucs12cm0_active(data->client, 0);
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}
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static const struct iio_buffer_setup_ops ucs12cm0_buffer_setup_ops = {
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.postenable = ucs12cm0_buffer_postenable,
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.predisable = ucs12cm0_buffer_predisable,
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};
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static int ucs12cm0_init(struct ucs12cm0_data *data)
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{
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int ret;
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struct i2c_client *client = data->client;
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ret = ucs12cm0_write_byte(client, UCS12CM0_SYS_CTRL, 0x00);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_INT_CTRL, 0x13);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_INT_FLAG, 0x00);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_WAIT, 0x00);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_ALS_GAIN, 0x84);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_ALS_TIME, 0x33);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_PS_LED, 0x00);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_PS_GAIN, 0x00);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_PS_PULSE, 0x00);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_PS_TIME, 0x0f);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_PS_AVERAGE, 0x0f);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_PS_PERSIST, 0x00);
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if (ret < 0)
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goto err;
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ret = ucs12cm0_write_byte(client, UCS12CM0_PS_OFFSET_L, 0x0000);
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if (ret < 0)
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goto err;
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|
ret = ucs12cm0_write_byte(client, UCS12CM0_ALS_THDHL, 0xff);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
ret = ucs12cm0_write_byte(client, UCS12CM0_ALS_THDHH, 0xff);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
ret = ucs12cm0_write_byte(client, UCS12CM0_ALS_THDLL, 0x00);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
ret = ucs12cm0_write_byte(client, UCS12CM0_ALS_THDLH, 0x00);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t ucs12cm0_interrupt_handler(int irq, void *priv)
|
|
{
|
|
struct iio_dev *indio_dev = priv;
|
|
struct ucs12cm0_data *data = iio_priv(indio_dev);
|
|
struct i2c_client *client = data->client;
|
|
struct ucs12cm0_scan scan;
|
|
int ret;
|
|
|
|
ret = ucs12cm0_read_byte(client, UCS12CM0_INT_FLAG);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret & UCS12CM0_INT_CLS) {
|
|
if (ucs12cm0_read(client, UCS12CM0_CLS_R_DATA_L, scan.chans,
|
|
sizeof(scan.chans)) < 0)
|
|
goto clear_irq;
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, &scan,
|
|
ktime_get_boottime_ns());
|
|
}
|
|
|
|
clear_irq:
|
|
if (ret & UCS12CM0_INT_CLS) {
|
|
ret &= ~UCS12CM0_INT_CLS;
|
|
ucs12cm0_write_byte(client, UCS12CM0_INT_FLAG, ret);
|
|
}
|
|
|
|
if (ret & UCS12CM0_INT_POR) {
|
|
ret &= ~UCS12CM0_INT_POR;
|
|
ucs12cm0_write_byte(client, UCS12CM0_INT_FLAG, ret);
|
|
}
|
|
|
|
out:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int ucs12cm0_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ucs12cm0_data *data;
|
|
struct iio_dev *indio_dev;
|
|
struct iio_buffer *buffer;
|
|
u32 type;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
buffer = devm_iio_kfifo_allocate(&client->dev);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
iio_device_attach_buffer(indio_dev, buffer);
|
|
|
|
data = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
data->client = client;
|
|
|
|
indio_dev->info = &ucs12cm0_info;
|
|
indio_dev->channels = ucs12cm0_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(ucs12cm0_channels);
|
|
indio_dev->name = "ucs12cm0";
|
|
indio_dev->modes = (INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE);
|
|
indio_dev->setup_ops = &ucs12cm0_buffer_setup_ops;
|
|
|
|
ret = ucs12cm0_init(data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (client->irq <= 0) {
|
|
dev_err(&client->dev, "no valid irq defined\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
type = irqd_get_trigger_type(irq_get_irq_data(client->irq));
|
|
if (type != IRQF_TRIGGER_LOW && type != IRQF_TRIGGER_FALLING) {
|
|
dev_err(&client->dev,
|
|
"unsupported IRQ trigger specified (%x)\n", type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, ucs12cm0_interrupt_handler,
|
|
type | IRQF_ONESHOT, "ucs12cm0_irq",
|
|
indio_dev);
|
|
if (ret) {
|
|
dev_err(&client->dev, "request irq (%d) failed\n",
|
|
client->irq);
|
|
return ret;
|
|
}
|
|
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
|
}
|
|
|
|
static const struct of_device_id ucs12cm0_of_match[] = {
|
|
{ .compatible = "ultracapteur,ucs12cm0", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ucs12cm0_of_match);
|
|
|
|
static const struct i2c_device_id ucs12cm0_id[] = {
|
|
{ "ucs12cm0", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ucs12cm0_id);
|
|
|
|
static int ucs12cm0_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct ucs12cm0_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = ucs12cm0_init(data);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops ucs12cm0_pm_ops = {
|
|
.resume = ucs12cm0_resume,
|
|
};
|
|
|
|
static struct i2c_driver ucs12cm0_driver = {
|
|
.driver = {
|
|
.name = "ucs12cm0",
|
|
.of_match_table = ucs12cm0_of_match,
|
|
.pm = &ucs12cm0_pm_ops,
|
|
},
|
|
.probe = ucs12cm0_probe,
|
|
.id_table = ucs12cm0_id,
|
|
};
|
|
|
|
module_i2c_driver(ucs12cm0_driver);
|
|
|
|
MODULE_AUTHOR("Jason Zhang <jason.zhang@rock-chips.com>");
|
|
MODULE_DESCRIPTION("UCS12CM0 illuminance and correlated color temperature sensor driver");
|
|
MODULE_LICENSE("GPL");
|