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![Jonathan Cameron](/assets/img/avatar_default.png)
Letting the compiler remove these functions when the kernel is built without CONFIG_PM_SLEEP support is simpler and less error prone than the use of #ifdef based config guards. Removing instances of this approach from IIO also stops them being copied into new drivers. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20220130193147.279148-3-jic23@kernel.org
195 lines
4.4 KiB
C
195 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* IIO driver for the MiraMEMS DA280 3-axis accelerometer and
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* IIO driver for the MiraMEMS DA226 2-axis accelerometer
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*
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* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
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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/acpi.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/byteorder/generic.h>
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#define DA280_REG_CHIP_ID 0x01
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#define DA280_REG_ACC_X_LSB 0x02
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#define DA280_REG_ACC_Y_LSB 0x04
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#define DA280_REG_ACC_Z_LSB 0x06
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#define DA280_REG_MODE_BW 0x11
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#define DA280_CHIP_ID 0x13
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#define DA280_MODE_ENABLE 0x1e
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#define DA280_MODE_DISABLE 0x9e
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enum da280_chipset { da226, da280 };
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/*
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* a value of + or -4096 corresponds to + or - 1G
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* scale = 9.81 / 4096 = 0.002395019
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*/
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static const int da280_nscale = 2395019;
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#define DA280_CHANNEL(reg, axis) { \
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.type = IIO_ACCEL, \
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.address = reg, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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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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static const struct iio_chan_spec da280_channels[] = {
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DA280_CHANNEL(DA280_REG_ACC_X_LSB, X),
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DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y),
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DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z),
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};
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struct da280_data {
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struct i2c_client *client;
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};
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static int da280_enable(struct i2c_client *client, bool enable)
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{
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u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE;
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return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data);
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}
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static int da280_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 da280_data *data = iio_priv(indio_dev);
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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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ret = i2c_smbus_read_word_data(data->client, chan->address);
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if (ret < 0)
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return ret;
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/*
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* Values are 14 bits, stored as 16 bits with the 2
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* least significant bits always 0.
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*/
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*val = (short)ret >> 2;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = da280_nscale;
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return IIO_VAL_INT_PLUS_NANO;
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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 da280_info = {
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.read_raw = da280_read_raw,
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};
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static enum da280_chipset da280_match_acpi_device(struct device *dev)
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{
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const struct acpi_device_id *id;
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id = acpi_match_device(dev->driver->acpi_match_table, dev);
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if (!id)
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return -EINVAL;
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return (enum da280_chipset) id->driver_data;
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}
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static void da280_disable(void *client)
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{
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da280_enable(client, false);
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}
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static int da280_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct da280_data *data;
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enum da280_chipset chip;
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ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID);
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if (ret != DA280_CHIP_ID)
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return (ret < 0) ? ret : -ENODEV;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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data->client = client;
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indio_dev->info = &da280_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = da280_channels;
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if (ACPI_HANDLE(&client->dev)) {
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chip = da280_match_acpi_device(&client->dev);
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} else {
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chip = id->driver_data;
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}
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if (chip == da226) {
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indio_dev->name = "da226";
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indio_dev->num_channels = 2;
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} else {
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indio_dev->name = "da280";
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indio_dev->num_channels = 3;
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}
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ret = da280_enable(client, true);
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if (ret < 0)
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return ret;
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ret = devm_add_action_or_reset(&client->dev, da280_disable, client);
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if (ret)
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return ret;
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static int da280_suspend(struct device *dev)
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{
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return da280_enable(to_i2c_client(dev), false);
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}
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static int da280_resume(struct device *dev)
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{
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return da280_enable(to_i2c_client(dev), true);
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}
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static DEFINE_SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);
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static const struct acpi_device_id da280_acpi_match[] = {
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{"MIRAACC", da280},
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{},
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};
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MODULE_DEVICE_TABLE(acpi, da280_acpi_match);
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static const struct i2c_device_id da280_i2c_id[] = {
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{ "da226", da226 },
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{ "da280", da280 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, da280_i2c_id);
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static struct i2c_driver da280_driver = {
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.driver = {
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.name = "da280",
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.acpi_match_table = ACPI_PTR(da280_acpi_match),
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.pm = pm_sleep_ptr(&da280_pm_ops),
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},
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.probe = da280_probe,
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.id_table = da280_i2c_id,
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};
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module_i2c_driver(da280_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver");
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MODULE_LICENSE("GPL v2");
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