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7cf15f4275
After commitb8a1a4cd5a("i2c: Provide a temporary .probe_new() call-back type"), all drivers being converted to .probe_new() and then03c835f498("i2c: Switch .probe() to not take an id parameter") convert back to (the new) .probe() to be able to eventually drop .probe_new() from struct i2c_driver. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20230515205048.19561-1-u.kleine-koenig@pengutronix.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
291 lines
6.6 KiB
C
291 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Support for ON Semiconductor NOA1305 ambient light sensor
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*
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* Copyright (C) 2016 Emcraft Systems
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* Copyright (C) 2019 Collabora Ltd.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/i2c.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/module.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#define NOA1305_REG_POWER_CONTROL 0x0
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#define NOA1305_POWER_CONTROL_DOWN 0x00
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#define NOA1305_POWER_CONTROL_ON 0x08
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#define NOA1305_REG_RESET 0x1
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#define NOA1305_RESET_RESET 0x10
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#define NOA1305_REG_INTEGRATION_TIME 0x2
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#define NOA1305_INTEGR_TIME_800MS 0x00
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#define NOA1305_INTEGR_TIME_400MS 0x01
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#define NOA1305_INTEGR_TIME_200MS 0x02
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#define NOA1305_INTEGR_TIME_100MS 0x03
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#define NOA1305_INTEGR_TIME_50MS 0x04
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#define NOA1305_INTEGR_TIME_25MS 0x05
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#define NOA1305_INTEGR_TIME_12_5MS 0x06
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#define NOA1305_INTEGR_TIME_6_25MS 0x07
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#define NOA1305_REG_INT_SELECT 0x3
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#define NOA1305_INT_SEL_ACTIVE_HIGH 0x01
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#define NOA1305_INT_SEL_ACTIVE_LOW 0x02
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#define NOA1305_INT_SEL_INACTIVE 0x03
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#define NOA1305_REG_INT_THRESH_LSB 0x4
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#define NOA1305_REG_INT_THRESH_MSB 0x5
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#define NOA1305_REG_ALS_DATA_LSB 0x6
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#define NOA1305_REG_ALS_DATA_MSB 0x7
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#define NOA1305_REG_DEVICE_ID_LSB 0x8
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#define NOA1305_REG_DEVICE_ID_MSB 0x9
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#define NOA1305_DEVICE_ID 0x0519
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#define NOA1305_DRIVER_NAME "noa1305"
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struct noa1305_priv {
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struct i2c_client *client;
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struct regmap *regmap;
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};
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static int noa1305_measure(struct noa1305_priv *priv)
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{
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__le16 data;
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int ret;
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ret = regmap_bulk_read(priv->regmap, NOA1305_REG_ALS_DATA_LSB, &data,
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2);
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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 noa1305_scale(struct noa1305_priv *priv, int *val, int *val2)
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{
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int data;
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int ret;
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ret = regmap_read(priv->regmap, NOA1305_REG_INTEGRATION_TIME, &data);
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if (ret < 0)
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return ret;
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/*
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* Lux = count / (<Integration Constant> * <Integration Time>)
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*
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* Integration Constant = 7.7
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* Integration Time in Seconds
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*/
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switch (data) {
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case NOA1305_INTEGR_TIME_800MS:
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*val = 100;
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*val2 = 77 * 8;
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break;
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case NOA1305_INTEGR_TIME_400MS:
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*val = 100;
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*val2 = 77 * 4;
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break;
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case NOA1305_INTEGR_TIME_200MS:
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*val = 100;
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*val2 = 77 * 2;
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break;
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case NOA1305_INTEGR_TIME_100MS:
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*val = 100;
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*val2 = 77;
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break;
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case NOA1305_INTEGR_TIME_50MS:
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*val = 1000;
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*val2 = 77 * 5;
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break;
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case NOA1305_INTEGR_TIME_25MS:
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*val = 10000;
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*val2 = 77 * 25;
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break;
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case NOA1305_INTEGR_TIME_12_5MS:
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*val = 100000;
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*val2 = 77 * 125;
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break;
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case NOA1305_INTEGR_TIME_6_25MS:
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*val = 1000000;
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*val2 = 77 * 625;
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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_FRACTIONAL;
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}
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static const struct iio_chan_spec noa1305_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
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}
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};
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static int noa1305_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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int ret = -EINVAL;
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struct noa1305_priv *priv = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (chan->type) {
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case IIO_LIGHT:
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ret = noa1305_measure(priv);
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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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default:
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break;
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}
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break;
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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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return noa1305_scale(priv, val, val2);
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default:
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break;
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}
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break;
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default:
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break;
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}
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return ret;
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}
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static const struct iio_info noa1305_info = {
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.read_raw = noa1305_read_raw,
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};
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static bool noa1305_writable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case NOA1305_REG_POWER_CONTROL:
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case NOA1305_REG_RESET:
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case NOA1305_REG_INTEGRATION_TIME:
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case NOA1305_REG_INT_SELECT:
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case NOA1305_REG_INT_THRESH_LSB:
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case NOA1305_REG_INT_THRESH_MSB:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_config noa1305_regmap_config = {
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.name = NOA1305_DRIVER_NAME,
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = NOA1305_REG_DEVICE_ID_MSB,
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.writeable_reg = noa1305_writable_reg,
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};
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static int noa1305_probe(struct i2c_client *client)
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{
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struct noa1305_priv *priv;
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struct iio_dev *indio_dev;
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struct regmap *regmap;
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__le16 data;
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unsigned int dev_id;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*priv));
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if (!indio_dev)
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return -ENOMEM;
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regmap = devm_regmap_init_i2c(client, &noa1305_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&client->dev, "Regmap initialization failed.\n");
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return PTR_ERR(regmap);
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}
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priv = iio_priv(indio_dev);
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ret = devm_regulator_get_enable(&client->dev, "vin");
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if (ret)
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return dev_err_probe(&client->dev, ret,
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"get regulator vin failed\n");
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i2c_set_clientdata(client, indio_dev);
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priv->client = client;
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priv->regmap = regmap;
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ret = regmap_bulk_read(regmap, NOA1305_REG_DEVICE_ID_LSB, &data, 2);
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if (ret < 0) {
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dev_err(&client->dev, "ID reading failed: %d\n", ret);
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return ret;
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}
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dev_id = le16_to_cpu(data);
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if (dev_id != NOA1305_DEVICE_ID) {
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dev_err(&client->dev, "Unknown device ID: 0x%x\n", dev_id);
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return -ENODEV;
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}
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ret = regmap_write(regmap, NOA1305_REG_POWER_CONTROL,
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NOA1305_POWER_CONTROL_ON);
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if (ret < 0) {
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dev_err(&client->dev, "Enabling power control failed\n");
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return ret;
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}
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ret = regmap_write(regmap, NOA1305_REG_RESET, NOA1305_RESET_RESET);
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if (ret < 0) {
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dev_err(&client->dev, "Device reset failed\n");
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return ret;
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}
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ret = regmap_write(regmap, NOA1305_REG_INTEGRATION_TIME,
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NOA1305_INTEGR_TIME_800MS);
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if (ret < 0) {
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dev_err(&client->dev, "Setting integration time failed\n");
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return ret;
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}
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indio_dev->info = &noa1305_info;
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indio_dev->channels = noa1305_channels;
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indio_dev->num_channels = ARRAY_SIZE(noa1305_channels);
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indio_dev->name = NOA1305_DRIVER_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = devm_iio_device_register(&client->dev, indio_dev);
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if (ret)
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dev_err(&client->dev, "registering device failed\n");
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return ret;
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}
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static const struct of_device_id noa1305_of_match[] = {
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{ .compatible = "onnn,noa1305" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, noa1305_of_match);
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static const struct i2c_device_id noa1305_ids[] = {
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{ "noa1305", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, noa1305_ids);
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static struct i2c_driver noa1305_driver = {
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.driver = {
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.name = NOA1305_DRIVER_NAME,
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.of_match_table = noa1305_of_match,
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},
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.probe = noa1305_probe,
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.id_table = noa1305_ids,
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};
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module_i2c_driver(noa1305_driver);
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MODULE_AUTHOR("Sergei Miroshnichenko <sergeimir@emcraft.com>");
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MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.com");
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MODULE_DESCRIPTION("ON Semiconductor NOA1305 ambient light sensor");
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MODULE_LICENSE("GPL");
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