From: Michael Hennerich Date: Mon, 22 Nov 2010 10:15:23 +0000 (+0100) Subject: staging: iio: dac: Enable driver support for AD5444 and AD5446 DA converters X-Git-Tag: v2.6.38-rc1~423^2~246 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b5a49481754a5cbfdc47bd701208f77c5c9010c6;p=platform%2Fupstream%2Fkernel-adaptation-pc.git staging: iio: dac: Enable driver support for AD5444 and AD5446 DA converters Enable support for AD5444 and AD5446: 12-/14-Bit High Bandwidth Multiplying DACs with Serial Interface. staging: iio: dac: Add support for AD5541A, AD5512A digital to analog convertors staging: iio: dac: Fix according to review feedback Review feedback by Jonathan Cameron: Remove spurious new line. Document struct members. Remove redundant variable initialization. Signed-off-by: Michael Hennerich Acked-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/iio/dac/Kconfig b/drivers/staging/iio/dac/Kconfig index 583df78..9c497cc 100644 --- a/drivers/staging/iio/dac/Kconfig +++ b/drivers/staging/iio/dac/Kconfig @@ -9,3 +9,13 @@ config AD5624R_SPI help Say yes here to build support for Analog Devices AD5624R, AD5644R and AD5664R convertors (DAC). This driver uses the common SPI interface. + +config AD5446 + tristate "Analog Devices AD5444, AD5446 and AD5541A, AD5512A DAC SPI driver" + depends on SPI + help + Say yes here to build support for Analog Devices AD5444, AD5446 + and AD5541A, AD5512A DACs. + + To compile this driver as a module, choose M here: the + module will be called ad5446. diff --git a/drivers/staging/iio/dac/Makefile b/drivers/staging/iio/dac/Makefile index 7ddf05d..7cf331b 100644 --- a/drivers/staging/iio/dac/Makefile +++ b/drivers/staging/iio/dac/Makefile @@ -3,3 +3,4 @@ # obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o +obj-$(CONFIG_AD5446) += ad5446.o diff --git a/drivers/staging/iio/dac/ad5446.c b/drivers/staging/iio/dac/ad5446.c new file mode 100644 index 0000000..ac3165b --- /dev/null +++ b/drivers/staging/iio/dac/ad5446.c @@ -0,0 +1,249 @@ +/* + * AD5446 SPI DAC driver + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../iio.h" +#include "../sysfs.h" +#include "dac.h" + +#include "ad5446.h" + +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); + switch (spi_get_device_id(st->spi)->driver_data) { + case ID_AD5444: + case ID_AD5446: + st->data = cpu_to_be16(AD5446_LOAD | + (val << st->chip_info->left_shift)); + break; + case ID_AD5542A: + case ID_AD5512A: + st->data = cpu_to_be16(val << st->chip_info->left_shift); + break; + } + + 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, + .sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */ + }, + [ID_AD5446] = { + .bits = 14, + .storagebits = 16, + .left_shift = 0, + .sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */ + }, + [ID_AD5542A] = { + .bits = 16, + .storagebits = 16, + .left_shift = 0, + .sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */ + }, + [ID_AD5512A] = { + .bits = 12, + .storagebits = 16, + .left_shift = 4, + .sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */ + }, +}; + +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 = 2, + + spi_message_init(&st->msg); + spi_message_add_tail(&st->xfer, &st->msg); + + 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}, + {} +}; + +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 "); +MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:ad5446"); diff --git a/drivers/staging/iio/dac/ad5446.h b/drivers/staging/iio/dac/ad5446.h new file mode 100644 index 0000000..24a9cda --- /dev/null +++ b/drivers/staging/iio/dac/ad5446.h @@ -0,0 +1,46 @@ +/* + * AD5446 SPI DAC driver + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ +#ifndef IIO_ADC_AD5446_H_ +#define IIO_ADC_AD5446_H_ + +/* DAC Control Bits */ + +#define AD5446_LOAD (0x0 << 14) /* Load and update */ +#define AD5446_SDO_DIS (0x1 << 14) /* Disable SDO */ +#define AD5446_NOP (0x2 << 14) /* No operation */ +#define AD5446_CLK_RISING (0x3 << 14) /* Clock data on rising edge */ + +#define RES_MASK(bits) ((1 << (bits)) - 1) + +struct ad5446_chip_info { + u8 bits; /* number of DAC bits */ + u8 storagebits; /* number of bits written to the DAC */ + u8 left_shift; /* number of bits the datum must be shifted */ + char sign; /* [s]igned or [u]nsigned */ +}; + +struct ad5446_state { + struct iio_dev *indio_dev; + struct spi_device *spi; + const struct ad5446_chip_info *chip_info; + struct regulator *reg; + struct work_struct poll_work; + unsigned short vref_mv; + struct spi_transfer xfer; + struct spi_message msg; + unsigned short data; +}; + +enum ad5446_supported_device_ids { + ID_AD5444, + ID_AD5446, + ID_AD5542A, + ID_AD5512A, +}; + +#endif /* IIO_ADC_AD5446_H_ */