287 lines
7.0 KiB
C
287 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ROHM 1780GLI Ambient Light Sensor Driver
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*
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* Copyright (C) 2016 Linaro Ltd.
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* Author: Linus Walleij <linus.walleij@linaro.org>
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* Loosely based on the previous BH1780 ALS misc driver
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* Copyright (C) 2010 Texas Instruments
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* Author: Hemanth V <hemanthv@ti.com>
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*/
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pm_runtime.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/bitops.h>
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#define BH1780_CMD_BIT BIT(7)
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#define BH1780_REG_CONTROL 0x00
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#define BH1780_REG_PARTID 0x0A
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#define BH1780_REG_MANFID 0x0B
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#define BH1780_REG_DLOW 0x0C
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#define BH1780_REG_DHIGH 0x0D
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#define BH1780_REVMASK GENMASK(3,0)
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#define BH1780_POWMASK GENMASK(1,0)
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#define BH1780_POFF (0x0)
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#define BH1780_PON (0x3)
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/* power on settling time in ms */
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#define BH1780_PON_DELAY 2
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/* max time before value available in ms */
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#define BH1780_INTERVAL 250
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struct bh1780_data {
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struct i2c_client *client;
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};
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static int bh1780_write(struct bh1780_data *bh1780, u8 reg, u8 val)
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{
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int ret = i2c_smbus_write_byte_data(bh1780->client,
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BH1780_CMD_BIT | reg,
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val);
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if (ret < 0)
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dev_err(&bh1780->client->dev,
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"i2c_smbus_write_byte_data failed error "
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"%d, register %01x\n",
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ret, reg);
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return ret;
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}
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static int bh1780_read(struct bh1780_data *bh1780, u8 reg)
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{
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int ret = i2c_smbus_read_byte_data(bh1780->client,
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BH1780_CMD_BIT | reg);
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if (ret < 0)
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dev_err(&bh1780->client->dev,
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"i2c_smbus_read_byte_data failed error "
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"%d, register %01x\n",
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ret, reg);
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return ret;
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}
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static int bh1780_read_word(struct bh1780_data *bh1780, u8 reg)
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{
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int ret = i2c_smbus_read_word_data(bh1780->client,
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BH1780_CMD_BIT | reg);
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if (ret < 0)
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dev_err(&bh1780->client->dev,
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"i2c_smbus_read_word_data failed error "
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"%d, register %01x\n",
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ret, reg);
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return ret;
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}
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static int bh1780_debugfs_reg_access(struct iio_dev *indio_dev,
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unsigned int reg, unsigned int writeval,
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unsigned int *readval)
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{
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struct bh1780_data *bh1780 = iio_priv(indio_dev);
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int ret;
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if (!readval)
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return bh1780_write(bh1780, (u8)reg, (u8)writeval);
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ret = bh1780_read(bh1780, (u8)reg);
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if (ret < 0)
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return ret;
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*readval = ret;
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return 0;
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}
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static int bh1780_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 bh1780_data *bh1780 = iio_priv(indio_dev);
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int value;
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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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pm_runtime_get_sync(&bh1780->client->dev);
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value = bh1780_read_word(bh1780, BH1780_REG_DLOW);
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if (value < 0)
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return value;
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pm_runtime_mark_last_busy(&bh1780->client->dev);
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pm_runtime_put_autosuspend(&bh1780->client->dev);
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*val = value;
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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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case IIO_CHAN_INFO_INT_TIME:
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*val = 0;
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*val2 = BH1780_INTERVAL * 1000;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info bh1780_info = {
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.read_raw = bh1780_read_raw,
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.debugfs_reg_access = bh1780_debugfs_reg_access,
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};
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static const struct iio_chan_spec bh1780_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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BIT(IIO_CHAN_INFO_INT_TIME)
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}
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};
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static int bh1780_probe(struct i2c_client *client)
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{
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int ret;
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struct bh1780_data *bh1780;
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struct i2c_adapter *adapter = client->adapter;
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struct iio_dev *indio_dev;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
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return -EIO;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*bh1780));
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if (!indio_dev)
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return -ENOMEM;
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bh1780 = iio_priv(indio_dev);
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bh1780->client = client;
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i2c_set_clientdata(client, indio_dev);
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/* Power up the device */
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ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_PON);
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if (ret < 0)
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return ret;
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msleep(BH1780_PON_DELAY);
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pm_runtime_get_noresume(&client->dev);
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pm_runtime_set_active(&client->dev);
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pm_runtime_enable(&client->dev);
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ret = bh1780_read(bh1780, BH1780_REG_PARTID);
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if (ret < 0)
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goto out_disable_pm;
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dev_info(&client->dev,
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"Ambient Light Sensor, Rev : %lu\n",
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(ret & BH1780_REVMASK));
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/*
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* As the device takes 250 ms to even come up with a fresh
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* measurement after power-on, do not shut it down unnecessarily.
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* Set autosuspend to a five seconds.
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*/
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pm_runtime_set_autosuspend_delay(&client->dev, 5000);
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pm_runtime_use_autosuspend(&client->dev);
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pm_runtime_put(&client->dev);
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indio_dev->info = &bh1780_info;
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indio_dev->name = "bh1780";
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indio_dev->channels = bh1780_channels;
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indio_dev->num_channels = ARRAY_SIZE(bh1780_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto out_disable_pm;
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return 0;
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out_disable_pm:
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pm_runtime_put_noidle(&client->dev);
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pm_runtime_disable(&client->dev);
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return ret;
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}
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static void bh1780_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct bh1780_data *bh1780 = iio_priv(indio_dev);
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int ret;
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iio_device_unregister(indio_dev);
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pm_runtime_get_sync(&client->dev);
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pm_runtime_put_noidle(&client->dev);
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pm_runtime_disable(&client->dev);
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ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_POFF);
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if (ret < 0)
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dev_err(&client->dev, "failed to power off (%pe)\n",
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ERR_PTR(ret));
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}
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static int bh1780_runtime_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct bh1780_data *bh1780 = iio_priv(indio_dev);
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int ret;
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ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_POFF);
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if (ret < 0) {
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dev_err(dev, "failed to runtime suspend\n");
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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 bh1780_runtime_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct bh1780_data *bh1780 = iio_priv(indio_dev);
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int ret;
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ret = bh1780_write(bh1780, BH1780_REG_CONTROL, BH1780_PON);
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if (ret < 0) {
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dev_err(dev, "failed to runtime resume\n");
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return ret;
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}
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/* Wait for power on, then for a value to be available */
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msleep(BH1780_PON_DELAY + BH1780_INTERVAL);
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return 0;
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}
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static DEFINE_RUNTIME_DEV_PM_OPS(bh1780_dev_pm_ops, bh1780_runtime_suspend,
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bh1780_runtime_resume, NULL);
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static const struct i2c_device_id bh1780_id[] = {
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{ "bh1780", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, bh1780_id);
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static const struct of_device_id of_bh1780_match[] = {
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{ .compatible = "rohm,bh1780gli", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_bh1780_match);
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static struct i2c_driver bh1780_driver = {
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.probe_new = bh1780_probe,
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.remove = bh1780_remove,
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.id_table = bh1780_id,
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.driver = {
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.name = "bh1780",
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.pm = pm_ptr(&bh1780_dev_pm_ops),
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.of_match_table = of_bh1780_match,
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},
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};
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module_i2c_driver(bh1780_driver);
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MODULE_DESCRIPTION("ROHM BH1780GLI Ambient Light Sensor Driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
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