| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Marcus Folkesson | 1004 | 99.31% | 1 | 25.00% |
| Jonathan Cameron | 4 | 0.40% | 1 | 25.00% |
| caihuoqing | 2 | 0.20% | 1 | 25.00% |
| Uwe Kleine-König | 1 | 0.10% | 1 | 25.00% |
| Total | 1011 | 4 |
// SPDX-License-Identifier: GPL-2.0 /* * Driver for Linear Technology LTC1665/LTC1660, 8 channels DAC * * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com> */ #include <linux/bitops.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/init.h> #include <linux/module.h> #include <linux/regulator/consumer.h> #include <linux/regmap.h> #include <linux/spi/spi.h> #define LTC1660_REG_WAKE 0x0 #define LTC1660_REG_DAC_A 0x1 #define LTC1660_REG_DAC_B 0x2 #define LTC1660_REG_DAC_C 0x3 #define LTC1660_REG_DAC_D 0x4 #define LTC1660_REG_DAC_E 0x5 #define LTC1660_REG_DAC_F 0x6 #define LTC1660_REG_DAC_G 0x7 #define LTC1660_REG_DAC_H 0x8 #define LTC1660_REG_SLEEP 0xe #define LTC1660_NUM_CHANNELS 8 static const struct regmap_config ltc1660_regmap_config = { .reg_bits = 4, .val_bits = 12, }; enum ltc1660_supported_device_ids { ID_LTC1660, ID_LTC1665, }; struct ltc1660_priv { struct spi_device *spi; struct regmap *regmap; struct regulator *vref_reg; unsigned int value[LTC1660_NUM_CHANNELS]; unsigned int vref_mv; }; static int ltc1660_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct ltc1660_priv *priv = iio_priv(indio_dev); switch (mask) { case IIO_CHAN_INFO_RAW: *val = priv->value[chan->channel]; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = regulator_get_voltage(priv->vref_reg); if (*val < 0) { dev_err(&priv->spi->dev, "failed to read vref regulator: %d\n", *val); return *val; } /* Convert to mV */ *val /= 1000; *val2 = chan->scan_type.realbits; return IIO_VAL_FRACTIONAL_LOG2; default: return -EINVAL; } } static int ltc1660_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct ltc1660_priv *priv = iio_priv(indio_dev); int ret; switch (mask) { case IIO_CHAN_INFO_RAW: if (val2 != 0) return -EINVAL; if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0)) return -EINVAL; ret = regmap_write(priv->regmap, chan->channel, (val << chan->scan_type.shift)); if (!ret) priv->value[chan->channel] = val; return ret; default: return -EINVAL; } } #define LTC1660_CHAN(chan, bits) { \ .type = IIO_VOLTAGE, \ .indexed = 1, \ .output = 1, \ .channel = chan, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ .scan_type = { \ .sign = 'u', \ .realbits = (bits), \ .storagebits = 16, \ .shift = 12 - (bits), \ }, \ } #define LTC1660_OCTAL_CHANNELS(bits) { \ LTC1660_CHAN(LTC1660_REG_DAC_A, bits), \ LTC1660_CHAN(LTC1660_REG_DAC_B, bits), \ LTC1660_CHAN(LTC1660_REG_DAC_C, bits), \ LTC1660_CHAN(LTC1660_REG_DAC_D, bits), \ LTC1660_CHAN(LTC1660_REG_DAC_E, bits), \ LTC1660_CHAN(LTC1660_REG_DAC_F, bits), \ LTC1660_CHAN(LTC1660_REG_DAC_G, bits), \ LTC1660_CHAN(LTC1660_REG_DAC_H, bits), \ } static const struct iio_chan_spec ltc1660_channels[][LTC1660_NUM_CHANNELS] = { [ID_LTC1660] = LTC1660_OCTAL_CHANNELS(10), [ID_LTC1665] = LTC1660_OCTAL_CHANNELS(8), }; static const struct iio_info ltc1660_info = { .read_raw = <c1660_read_raw, .write_raw = <c1660_write_raw, }; static int ltc1660_suspend(struct device *dev) { struct ltc1660_priv *priv = iio_priv(spi_get_drvdata( to_spi_device(dev))); return regmap_write(priv->regmap, LTC1660_REG_SLEEP, 0x00); } static int ltc1660_resume(struct device *dev) { struct ltc1660_priv *priv = iio_priv(spi_get_drvdata( to_spi_device(dev))); return regmap_write(priv->regmap, LTC1660_REG_WAKE, 0x00); } static DEFINE_SIMPLE_DEV_PM_OPS(ltc1660_pm_ops, ltc1660_suspend, ltc1660_resume); static int ltc1660_probe(struct spi_device *spi) { struct iio_dev *indio_dev; struct ltc1660_priv *priv; const struct spi_device_id *id = spi_get_device_id(spi); int ret; indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*priv)); if (indio_dev == NULL) return -ENOMEM; priv = iio_priv(indio_dev); priv->regmap = devm_regmap_init_spi(spi, <c1660_regmap_config); if (IS_ERR(priv->regmap)) { dev_err(&spi->dev, "failed to register spi regmap %ld\n", PTR_ERR(priv->regmap)); return PTR_ERR(priv->regmap); } priv->vref_reg = devm_regulator_get(&spi->dev, "vref"); if (IS_ERR(priv->vref_reg)) return dev_err_probe(&spi->dev, PTR_ERR(priv->vref_reg), "vref regulator not specified\n"); ret = regulator_enable(priv->vref_reg); if (ret) { dev_err(&spi->dev, "failed to enable vref regulator: %d\n", ret); return ret; } priv->spi = spi; spi_set_drvdata(spi, indio_dev); indio_dev->info = <c1660_info; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = ltc1660_channels[id->driver_data]; indio_dev->num_channels = LTC1660_NUM_CHANNELS; indio_dev->name = id->name; ret = iio_device_register(indio_dev); if (ret) { dev_err(&spi->dev, "failed to register iio device: %d\n", ret); goto error_disable_reg; } return 0; error_disable_reg: regulator_disable(priv->vref_reg); return ret; } static void ltc1660_remove(struct spi_device *spi) { struct iio_dev *indio_dev = spi_get_drvdata(spi); struct ltc1660_priv *priv = iio_priv(indio_dev); iio_device_unregister(indio_dev); regulator_disable(priv->vref_reg); } static const struct of_device_id ltc1660_dt_ids[] = { { .compatible = "lltc,ltc1660", .data = (void *)ID_LTC1660 }, { .compatible = "lltc,ltc1665", .data = (void *)ID_LTC1665 }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, ltc1660_dt_ids); static const struct spi_device_id ltc1660_id[] = { {"ltc1660", ID_LTC1660}, {"ltc1665", ID_LTC1665}, { /* sentinel */ } }; MODULE_DEVICE_TABLE(spi, ltc1660_id); static struct spi_driver ltc1660_driver = { .driver = { .name = "ltc1660", .of_match_table = ltc1660_dt_ids, .pm = pm_sleep_ptr(<c1660_pm_ops), }, .probe = ltc1660_probe, .remove = ltc1660_remove, .id_table = ltc1660_id, }; module_spi_driver(ltc1660_driver); MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>"); MODULE_DESCRIPTION("Linear Technology LTC1660/LTC1665 DAC"); MODULE_LICENSE("GPL v2");
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