/* * AD7466/7/8 AD7476/5/7/8 (A) SPI ADC driver * * Copyright 2010 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #include #include #include #include #include #include #include #include "../iio.h" #include "../sysfs.h" #include "../ring_generic.h" #include "adc.h" #include "ad7476.h" static int ad7476_scan_direct(struct ad7476_state *st) { int ret; ret = spi_sync(st->spi, &st->msg); if (ret) return ret; return (st->data[0] << 8) | st->data[1]; } static int ad7476_read_raw(struct iio_dev *dev_info, struct iio_chan_spec const *chan, int *val, int *val2, long m) { int ret; struct ad7476_state *st = iio_priv(dev_info); unsigned int scale_uv; switch (m) { case 0: mutex_lock(&dev_info->mlock); if (iio_ring_enabled(dev_info)) ret = ad7476_scan_from_ring(dev_info); else ret = ad7476_scan_direct(st); mutex_unlock(&dev_info->mlock); if (ret < 0) return ret; *val = (ret >> st->chip_info->channel[0].scan_type.shift) & RES_MASK(st->chip_info->channel[0].scan_type.realbits); return IIO_VAL_INT; case (1 << IIO_CHAN_INFO_SCALE_SHARED): scale_uv = (st->int_vref_mv * 1000) >> st->chip_info->channel[0].scan_type.realbits; *val = scale_uv/1000; *val2 = (scale_uv%1000)*1000; return IIO_VAL_INT_PLUS_MICRO; } return -EINVAL; } static const struct ad7476_chip_info ad7476_chip_info_tbl[] = { [ID_AD7466] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 12, 16, 0), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, [ID_AD7467] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 10, 16, 2), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, [ID_AD7468] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1 , 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 8, 16, 4), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, [ID_AD7475] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 12, 16, 0), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, [ID_AD7476] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 12, 16, 0), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, [ID_AD7477] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 10, 16, 2), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, [ID_AD7478] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 8, 16, 4), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), }, [ID_AD7495] = { .channel[0] = IIO_CHAN(IIO_IN, 0, 1, 0, NULL, 0, 0, (1 << IIO_CHAN_INFO_SCALE_SHARED), 0, 0, IIO_ST('u', 12, 16, 0), 0), .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1), .int_vref_mv = 2500, }, }; static const struct iio_info ad7476_info = { .driver_module = THIS_MODULE, .read_raw = &ad7476_read_raw, }; static int __devinit ad7476_probe(struct spi_device *spi) { struct ad7476_platform_data *pdata = spi->dev.platform_data; struct ad7476_state *st; struct iio_dev *indio_dev; int ret, voltage_uv = 0; bool reg_done = false; struct regulator *reg; indio_dev = iio_allocate_device(sizeof(*st)); if (indio_dev == NULL) { ret = -ENOMEM; goto error_ret; } st = iio_priv(indio_dev); reg = regulator_get(&spi->dev, "vcc"); if (!IS_ERR(reg)) { ret = regulator_enable(reg); if (ret) goto error_put_reg; voltage_uv = regulator_get_voltage(reg); } st->reg = reg; st->chip_info = &ad7476_chip_info_tbl[spi_get_device_id(spi)->driver_data]; if (st->chip_info->int_vref_mv) st->int_vref_mv = st->chip_info->int_vref_mv; else if (pdata && pdata->vref_mv) st->int_vref_mv = pdata->vref_mv; else if (voltage_uv) st->int_vref_mv = voltage_uv / 1000; else dev_warn(&spi->dev, "reference voltage unspecified\n"); spi_set_drvdata(spi, indio_dev); st->spi = spi; /* Establish that the iio_dev is a child of the spi device */ indio_dev->dev.parent = &spi->dev; indio_dev->name = spi_get_device_id(spi)->name; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = st->chip_info->channel; indio_dev->num_channels = 2; indio_dev->info = &ad7476_info; /* Setup default message */ st->xfer.rx_buf = &st->data; st->xfer.len = st->chip_info->channel[0].scan_type.storagebits / 8; spi_message_init(&st->msg); spi_message_add_tail(&st->xfer, &st->msg); ret = ad7476_register_ring_funcs_and_init(indio_dev); if (ret) goto error_disable_reg; ret = iio_device_register(indio_dev); if (ret) goto error_disable_reg; ret = iio_ring_buffer_register_ex(indio_dev->ring, 0, st->chip_info->channel, ARRAY_SIZE(st->chip_info->channel)); if (ret) goto error_cleanup_ring; return 0; error_cleanup_ring: ad7476_ring_cleanup(indio_dev); iio_device_unregister(indio_dev); error_disable_reg: if (!IS_ERR(reg)) regulator_disable(st->reg); error_put_reg: if (!IS_ERR(reg)) regulator_put(reg); if (!reg_done) iio_free_device(indio_dev); error_ret: return ret; } static int ad7476_remove(struct spi_device *spi) { struct iio_dev *indio_dev = spi_get_drvdata(spi); struct ad7476_state *st = iio_priv(indio_dev); /* copy needed as st will have been freed */ struct regulator *reg = st->reg; iio_ring_buffer_unregister(indio_dev->ring); ad7476_ring_cleanup(indio_dev); iio_device_unregister(indio_dev); if (!IS_ERR(reg)) { regulator_disable(reg); regulator_put(reg); } return 0; } static const struct spi_device_id ad7476_id[] = { {"ad7466", ID_AD7466}, {"ad7467", ID_AD7467}, {"ad7468", ID_AD7468}, {"ad7475", ID_AD7475}, {"ad7476", ID_AD7476}, {"ad7476a", ID_AD7476}, {"ad7477", ID_AD7477}, {"ad7477a", ID_AD7477}, {"ad7478", ID_AD7478}, {"ad7478a", ID_AD7478}, {"ad7495", ID_AD7495}, {} }; static struct spi_driver ad7476_driver = { .driver = { .name = "ad7476", .bus = &spi_bus_type, .owner = THIS_MODULE, }, .probe = ad7476_probe, .remove = __devexit_p(ad7476_remove), .id_table = ad7476_id, }; static int __init ad7476_init(void) { return spi_register_driver(&ad7476_driver); } module_init(ad7476_init); static void __exit ad7476_exit(void) { spi_unregister_driver(&ad7476_driver); } module_exit(ad7476_exit); MODULE_AUTHOR("Michael Hennerich "); MODULE_DESCRIPTION("Analog Devices AD7475/6/7/8(A) AD7466/7/8 ADC"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("spi:ad7476");