| /* |
| * 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.%03d\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"); |