Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Cristina Moraru | 588 | 99.32% | 1 | 33.33% |
Julia Lawall | 2 | 0.34% | 1 | 33.33% |
Thomas Gleixner | 2 | 0.34% | 1 | 33.33% |
Total | 592 | 3 |
// SPDX-License-Identifier: GPL-2.0-only /* * max5487.c - Support for MAX5487, MAX5488, MAX5489 digital potentiometers * * Copyright (C) 2016 Cristina-Gabriela Moraru <cristina.moraru09@gmail.com> */ #include <linux/module.h> #include <linux/spi/spi.h> #include <linux/acpi.h> #include <linux/iio/sysfs.h> #include <linux/iio/iio.h> #define MAX5487_WRITE_WIPER_A (0x01 << 8) #define MAX5487_WRITE_WIPER_B (0x02 << 8) /* copy both wiper regs to NV regs */ #define MAX5487_COPY_AB_TO_NV (0x23 << 8) /* copy both NV regs to wiper regs */ #define MAX5487_COPY_NV_TO_AB (0x33 << 8) #define MAX5487_MAX_POS 255 struct max5487_data { struct spi_device *spi; int kohms; }; #define MAX5487_CHANNEL(ch, addr) { \ .type = IIO_RESISTANCE, \ .indexed = 1, \ .output = 1, \ .channel = ch, \ .address = addr, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ } static const struct iio_chan_spec max5487_channels[] = { MAX5487_CHANNEL(0, MAX5487_WRITE_WIPER_A), MAX5487_CHANNEL(1, MAX5487_WRITE_WIPER_B), }; static int max5487_write_cmd(struct spi_device *spi, u16 cmd) { return spi_write(spi, (const void *) &cmd, sizeof(u16)); } static int max5487_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct max5487_data *data = iio_priv(indio_dev); if (mask != IIO_CHAN_INFO_SCALE) return -EINVAL; *val = 1000 * data->kohms; *val2 = MAX5487_MAX_POS; return IIO_VAL_FRACTIONAL; } static int max5487_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct max5487_data *data = iio_priv(indio_dev); if (mask != IIO_CHAN_INFO_RAW) return -EINVAL; if (val < 0 || val > MAX5487_MAX_POS) return -EINVAL; return max5487_write_cmd(data->spi, chan->address | val); } static const struct iio_info max5487_info = { .read_raw = max5487_read_raw, .write_raw = max5487_write_raw, }; static int max5487_spi_probe(struct spi_device *spi) { struct iio_dev *indio_dev; struct max5487_data *data; const struct spi_device_id *id = spi_get_device_id(spi); int ret; indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; spi_set_drvdata(spi, indio_dev); data = iio_priv(indio_dev); data->spi = spi; data->kohms = id->driver_data; indio_dev->info = &max5487_info; indio_dev->name = id->name; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = max5487_channels; indio_dev->num_channels = ARRAY_SIZE(max5487_channels); /* restore both wiper regs from NV regs */ ret = max5487_write_cmd(data->spi, MAX5487_COPY_NV_TO_AB); if (ret < 0) return ret; return iio_device_register(indio_dev); } static int max5487_spi_remove(struct spi_device *spi) { struct iio_dev *indio_dev = spi_get_drvdata(spi); iio_device_unregister(indio_dev); /* save both wiper regs to NV regs */ return max5487_write_cmd(spi, MAX5487_COPY_AB_TO_NV); } static const struct spi_device_id max5487_id[] = { { "MAX5487", 10 }, { "MAX5488", 50 }, { "MAX5489", 100 }, { } }; MODULE_DEVICE_TABLE(spi, max5487_id); static const struct acpi_device_id max5487_acpi_match[] = { { "MAX5487", 10 }, { "MAX5488", 50 }, { "MAX5489", 100 }, { }, }; MODULE_DEVICE_TABLE(acpi, max5487_acpi_match); static struct spi_driver max5487_driver = { .driver = { .name = "max5487", .acpi_match_table = ACPI_PTR(max5487_acpi_match), }, .id_table = max5487_id, .probe = max5487_spi_probe, .remove = max5487_spi_remove }; module_spi_driver(max5487_driver); MODULE_AUTHOR("Cristina-Gabriela Moraru <cristina.moraru09@gmail.com>"); MODULE_DESCRIPTION("max5487 SPI driver"); MODULE_LICENSE("GPL v2");
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