| /* |
| * AD7466/7/8 AD7476/5/7/8 (A) SPI ADC driver |
| * |
| * Copyright 2010 Analog Devices Inc. |
| * |
| * Licensed under the GPL-2 or later. |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/sysfs.h> |
| #include <linux/spi/spi.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/err.h> |
| #include <linux/module.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| #include "../buffer_generic.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 *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, |
| int *val2, |
| long m) |
| { |
| int ret; |
| struct ad7476_state *st = iio_priv(indio_dev); |
| unsigned int scale_uv; |
| |
| switch (m) { |
| case 0: |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) |
| ret = ad7476_scan_from_ring(indio_dev); |
| else |
| ret = ad7476_scan_direct(st); |
| mutex_unlock(&indio_dev->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_VOLTAGE, 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_VOLTAGE, 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_VOLTAGE, 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_VOLTAGE, 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_VOLTAGE, 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_VOLTAGE, 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_VOLTAGE, 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_VOLTAGE, 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; |
| |
| indio_dev = iio_allocate_device(sizeof(*st)); |
| if (indio_dev == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| st = iio_priv(indio_dev); |
| st->reg = regulator_get(&spi->dev, "vcc"); |
| if (!IS_ERR(st->reg)) { |
| ret = regulator_enable(st->reg); |
| if (ret) |
| goto error_put_reg; |
| |
| voltage_uv = regulator_get_voltage(st->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_buffer_register(indio_dev, |
| st->chip_info->channel, |
| ARRAY_SIZE(st->chip_info->channel)); |
| if (ret) |
| goto error_cleanup_ring; |
| |
| ret = iio_device_register(indio_dev); |
| if (ret) |
| goto error_ring_unregister; |
| return 0; |
| |
| error_ring_unregister: |
| iio_buffer_unregister(indio_dev); |
| error_cleanup_ring: |
| ad7476_ring_cleanup(indio_dev); |
| error_disable_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_disable(st->reg); |
| error_put_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_put(st->reg); |
| 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); |
| |
| iio_device_unregister(indio_dev); |
| iio_buffer_unregister(indio_dev); |
| ad7476_ring_cleanup(indio_dev); |
| if (!IS_ERR(st->reg)) { |
| regulator_disable(st->reg); |
| regulator_put(st->reg); |
| } |
| iio_free_device(indio_dev); |
| |
| 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 <hennerich@blackfin.uclinux.org>"); |
| MODULE_DESCRIPTION("Analog Devices AD7475/6/7/8(A) AD7466/7/8 ADC"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("spi:ad7476"); |