diff options
Diffstat (limited to 'drivers/staging/iio/dac/ad5446.c')
| -rw-r--r-- | drivers/staging/iio/dac/ad5446.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/staging/iio/dac/ad5446.c b/drivers/staging/iio/dac/ad5446.c new file mode 100644 index 0000000..e3387cd --- /dev/null +++ b/drivers/staging/iio/dac/ad5446.c @@ -0,0 +1,323 @@ +/* + * AD5446 SPI DAC driver + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/list.h> +#include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> + +#include "../iio.h" +#include "../sysfs.h" +#include "dac.h" + +#include "ad5446.h" + +static void ad5446_store_sample(struct ad5446_state *st, unsigned val) +{ + st->data.d16 = cpu_to_be16(AD5446_LOAD | + (val << st->chip_info->left_shift)); +} + +static void ad5542_store_sample(struct ad5446_state *st, unsigned val) +{ + st->data.d16 = cpu_to_be16(val << st->chip_info->left_shift); +} + +static void ad5620_store_sample(struct ad5446_state *st, unsigned val) +{ + st->data.d16 = cpu_to_be16(AD5620_LOAD | + (val << st->chip_info->left_shift)); +} + +static void ad5660_store_sample(struct ad5446_state *st, unsigned val) +{ + val |= AD5660_LOAD; + st->data.d24[0] = (val >> 16) & 0xFF; + st->data.d24[1] = (val >> 8) & 0xFF; + st->data.d24[2] = val & 0xFF; +} + +static ssize_t ad5446_write(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad5446_state *st = dev_info->dev_data; + int ret; + long val; + + ret = strict_strtol(buf, 10, &val); + if (ret) + goto error_ret; + + if (val > RES_MASK(st->chip_info->bits)) { + ret = -EINVAL; + goto error_ret; + } + + mutex_lock(&dev_info->mlock); + st->chip_info->store_sample(st, val); + ret = spi_sync(st->spi, &st->msg); + mutex_unlock(&dev_info->mlock); + +error_ret: + return ret ? ret : len; +} + +static IIO_DEV_ATTR_OUT_RAW(0, ad5446_write, 0); + +static ssize_t ad5446_show_scale(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad5446_state *st = iio_dev_get_devdata(dev_info); + /* Corresponds to Vref / 2^(bits) */ + unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits; + + return sprintf(buf, "%d.%d\n", scale_uv / 1000, scale_uv % 1000); +} +static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5446_show_scale, NULL, 0); + +static ssize_t ad5446_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad5446_state *st = iio_dev_get_devdata(dev_info); + + return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name); +} +static IIO_DEVICE_ATTR(name, S_IRUGO, ad5446_show_name, NULL, 0); + +static struct attribute *ad5446_attributes[] = { + &iio_dev_attr_out0_raw.dev_attr.attr, + &iio_dev_attr_out_scale.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad5446_attribute_group = { + .attrs = ad5446_attributes, +}; + +static const struct ad5446_chip_info ad5446_chip_info_tbl[] = { + [ID_AD5444] = { + .bits = 12, + .storagebits = 16, + .left_shift = 2, + .store_sample = ad5446_store_sample, + }, + [ID_AD5446] = { + .bits = 14, + .storagebits = 16, + .left_shift = 0, + .store_sample = ad5446_store_sample, + }, + [ID_AD5542A] = { + .bits = 16, + .storagebits = 16, + .left_shift = 0, + .store_sample = ad5542_store_sample, + }, + [ID_AD5512A] = { + .bits = 12, + .storagebits = 16, + .left_shift = 4, + .store_sample = ad5542_store_sample, + }, + [ID_AD5620_2500] = { + .bits = 12, + .storagebits = 16, + .left_shift = 2, + .int_vref_mv = 2500, + .store_sample = ad5620_store_sample, + }, + [ID_AD5620_1250] = { + .bits = 12, + .storagebits = 16, + .left_shift = 2, + .int_vref_mv = 1250, + .store_sample = ad5620_store_sample, + }, + [ID_AD5640_2500] = { + .bits = 14, + .storagebits = 16, + .left_shift = 0, + .int_vref_mv = 2500, + .store_sample = ad5620_store_sample, + }, + [ID_AD5640_1250] = { + .bits = 14, + .storagebits = 16, + .left_shift = 0, + .int_vref_mv = 1250, + .store_sample = ad5620_store_sample, + }, + [ID_AD5660_2500] = { + .bits = 16, + .storagebits = 24, + .left_shift = 0, + .int_vref_mv = 2500, + .store_sample = ad5660_store_sample, + }, + [ID_AD5660_1250] = { + .bits = 16, + .storagebits = 24, + .left_shift = 0, + .int_vref_mv = 1250, + .store_sample = ad5660_store_sample, + }, +}; + +static int __devinit ad5446_probe(struct spi_device *spi) +{ + struct ad5446_state *st; + int ret, voltage_uv = 0; + + st = kzalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + 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 = + &ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + spi_set_drvdata(spi, st); + + st->spi = spi; + + st->indio_dev = iio_allocate_device(); + if (st->indio_dev == NULL) { + ret = -ENOMEM; + goto error_disable_reg; + } + + /* Estabilish that the iio_dev is a child of the spi device */ + st->indio_dev->dev.parent = &spi->dev; + st->indio_dev->attrs = &ad5446_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + /* Setup default message */ + + st->xfer.tx_buf = &st->data; + st->xfer.len = st->chip_info->storagebits / 8; + + spi_message_init(&st->msg); + spi_message_add_tail(&st->xfer, &st->msg); + + switch (spi_get_device_id(spi)->driver_data) { + case ID_AD5620_2500: + case ID_AD5620_1250: + case ID_AD5640_2500: + case ID_AD5640_1250: + case ID_AD5660_2500: + case ID_AD5660_1250: + st->vref_mv = st->chip_info->int_vref_mv; + break; + default: + if (voltage_uv) + st->vref_mv = voltage_uv / 1000; + else + dev_warn(&spi->dev, + "reference voltage unspecified\n"); + } + + ret = iio_device_register(st->indio_dev); + if (ret) + goto error_free_device; + + return 0; + +error_free_device: + iio_free_device(st->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); + kfree(st); +error_ret: + return ret; +} + +static int ad5446_remove(struct spi_device *spi) +{ + struct ad5446_state *st = spi_get_drvdata(spi); + struct iio_dev *indio_dev = st->indio_dev; + + iio_device_unregister(indio_dev); + if (!IS_ERR(st->reg)) { + regulator_disable(st->reg); + regulator_put(st->reg); + } + kfree(st); + return 0; +} + +static const struct spi_device_id ad5446_id[] = { + {"ad5444", ID_AD5444}, + {"ad5446", ID_AD5446}, + {"ad5542a", ID_AD5542A}, + {"ad5512a", ID_AD5512A}, + {"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */ + {"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */ + {"ad5640-2500", ID_AD5640_2500}, + {"ad5640-1250", ID_AD5640_1250}, + {"ad5660-2500", ID_AD5660_2500}, + {"ad5660-1250", ID_AD5660_1250}, + {} +}; + +static struct spi_driver ad5446_driver = { + .driver = { + .name = "ad5446", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = ad5446_probe, + .remove = __devexit_p(ad5446_remove), + .id_table = ad5446_id, +}; + +static int __init ad5446_init(void) +{ + return spi_register_driver(&ad5446_driver); +} +module_init(ad5446_init); + +static void __exit ad5446_exit(void) +{ + spi_unregister_driver(&ad5446_driver); +} +module_exit(ad5446_exit); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:ad5446"); |