diff options
Diffstat (limited to 'drivers/staging/iio/dac/ad5791.c')
| -rw-r--r-- | drivers/staging/iio/dac/ad5791.c | 421 |
1 files changed, 0 insertions, 421 deletions
diff --git a/drivers/staging/iio/dac/ad5791.c b/drivers/staging/iio/dac/ad5791.c deleted file mode 100644 index 13d8b5bb1cea..000000000000 --- a/drivers/staging/iio/dac/ad5791.c +++ /dev/null @@ -1,421 +0,0 @@ -/* - * AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog - * Converter - * - * Copyright 2011 Analog Devices Inc. - * - * Licensed under the GPL-2. - */ - -#include <linux/interrupt.h> -#include <linux/fs.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/spi/spi.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/regulator/consumer.h> -#include <linux/module.h> - -#include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> -#include "dac.h" -#include "ad5791.h" - -static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val) -{ - union { - u32 d32; - u8 d8[4]; - } data; - - data.d32 = cpu_to_be32(AD5791_CMD_WRITE | - AD5791_ADDR(addr) | - (val & AD5791_DAC_MASK)); - - return spi_write(spi, &data.d8[1], 3); -} - -static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val) -{ - union { - u32 d32; - u8 d8[4]; - } data[3]; - int ret; - struct spi_message msg; - struct spi_transfer xfers[] = { - { - .tx_buf = &data[0].d8[1], - .bits_per_word = 8, - .len = 3, - .cs_change = 1, - }, { - .tx_buf = &data[1].d8[1], - .rx_buf = &data[2].d8[1], - .bits_per_word = 8, - .len = 3, - }, - }; - - data[0].d32 = cpu_to_be32(AD5791_CMD_READ | - AD5791_ADDR(addr)); - data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP)); - - spi_message_init(&msg); - spi_message_add_tail(&xfers[0], &msg); - spi_message_add_tail(&xfers[1], &msg); - ret = spi_sync(spi, &msg); - - *val = be32_to_cpu(data[2].d32); - - return ret; -} - -#define AD5791_CHAN(bits, shift) { \ - .type = IIO_VOLTAGE, \ - .output = 1, \ - .indexed = 1, \ - .address = AD5791_ADDR_DAC0, \ - .channel = 0, \ - .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \ - IIO_CHAN_INFO_SCALE_SHARED_BIT | \ - IIO_CHAN_INFO_OFFSET_SHARED_BIT, \ - .scan_type = IIO_ST('u', bits, 24, shift) \ -} - -static const struct iio_chan_spec ad5791_channels[] = { - [ID_AD5760] = AD5791_CHAN(16, 4), - [ID_AD5780] = AD5791_CHAN(18, 2), - [ID_AD5781] = AD5791_CHAN(18, 2), - [ID_AD5791] = AD5791_CHAN(20, 0) -}; - -static ssize_t ad5791_read_powerdown_mode(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad5791_state *st = iio_priv(indio_dev); - - const char mode[][14] = {"6kohm_to_gnd", "three_state"}; - - return sprintf(buf, "%s\n", mode[st->pwr_down_mode]); -} - -static ssize_t ad5791_write_powerdown_mode(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad5791_state *st = iio_priv(indio_dev); - int ret; - - if (sysfs_streq(buf, "6kohm_to_gnd")) - st->pwr_down_mode = AD5791_DAC_PWRDN_6K; - else if (sysfs_streq(buf, "three_state")) - st->pwr_down_mode = AD5791_DAC_PWRDN_3STATE; - else - ret = -EINVAL; - - return ret ? ret : len; -} - -static ssize_t ad5791_read_dac_powerdown(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad5791_state *st = iio_priv(indio_dev); - - return sprintf(buf, "%d\n", st->pwr_down); -} - -static ssize_t ad5791_write_dac_powerdown(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - long readin; - int ret; - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad5791_state *st = iio_priv(indio_dev); - - ret = strict_strtol(buf, 10, &readin); - if (ret) - return ret; - - if (readin == 0) { - st->pwr_down = false; - st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI); - } else if (readin == 1) { - st->pwr_down = true; - if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K) - st->ctrl |= AD5791_CTRL_OPGND; - else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE) - st->ctrl |= AD5791_CTRL_DACTRI; - } else - ret = -EINVAL; - - ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl); - - return ret ? ret : len; -} - -static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO | - S_IWUSR, ad5791_read_powerdown_mode, - ad5791_write_powerdown_mode, 0); - -static IIO_CONST_ATTR(out_voltage_powerdown_mode_available, - "6kohm_to_gnd three_state"); - -#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \ - IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \ - S_IRUGO | S_IWUSR, _show, _store, _addr) - -static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5791_read_dac_powerdown, - ad5791_write_dac_powerdown, 0); - -static struct attribute *ad5791_attributes[] = { - &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr, - &iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr, - &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr, - NULL, -}; - -static const struct attribute_group ad5791_attribute_group = { - .attrs = ad5791_attributes, -}; - -static int ad5791_get_lin_comp(unsigned int span) -{ - if (span <= 10000) - return AD5791_LINCOMP_0_10; - else if (span <= 12000) - return AD5791_LINCOMP_10_12; - else if (span <= 16000) - return AD5791_LINCOMP_12_16; - else if (span <= 19000) - return AD5791_LINCOMP_16_19; - else - return AD5791_LINCOMP_19_20; -} - -static int ad5780_get_lin_comp(unsigned int span) -{ - if (span <= 10000) - return AD5780_LINCOMP_0_10; - else - return AD5780_LINCOMP_10_20; -} -static const struct ad5791_chip_info ad5791_chip_info_tbl[] = { - [ID_AD5760] = { - .get_lin_comp = ad5780_get_lin_comp, - }, - [ID_AD5780] = { - .get_lin_comp = ad5780_get_lin_comp, - }, - [ID_AD5781] = { - .get_lin_comp = ad5791_get_lin_comp, - }, - [ID_AD5791] = { - .get_lin_comp = ad5791_get_lin_comp, - }, -}; - -static int ad5791_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - struct ad5791_state *st = iio_priv(indio_dev); - u64 val64; - int ret; - - switch (m) { - case IIO_CHAN_INFO_RAW: - ret = ad5791_spi_read(st->spi, chan->address, val); - if (ret) - return ret; - *val &= AD5791_DAC_MASK; - *val >>= chan->scan_type.shift; - return IIO_VAL_INT; - case IIO_CHAN_INFO_SCALE: - *val = 0; - *val2 = (((u64)st->vref_mv) * 1000000ULL) >> chan->scan_type.realbits; - return IIO_VAL_INT_PLUS_MICRO; - case IIO_CHAN_INFO_OFFSET: - val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits); - do_div(val64, st->vref_mv); - *val = -val64; - return IIO_VAL_INT; - default: - return -EINVAL; - } - -}; - - -static int ad5791_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, - int val2, - long mask) -{ - struct ad5791_state *st = iio_priv(indio_dev); - - switch (mask) { - case IIO_CHAN_INFO_RAW: - val &= AD5791_RES_MASK(chan->scan_type.realbits); - val <<= chan->scan_type.shift; - - return ad5791_spi_write(st->spi, chan->address, val); - - default: - return -EINVAL; - } -} - -static const struct iio_info ad5791_info = { - .read_raw = &ad5791_read_raw, - .write_raw = &ad5791_write_raw, - .attrs = &ad5791_attribute_group, - .driver_module = THIS_MODULE, -}; - -static int __devinit ad5791_probe(struct spi_device *spi) -{ - struct ad5791_platform_data *pdata = spi->dev.platform_data; - struct iio_dev *indio_dev; - struct ad5791_state *st; - int ret, pos_voltage_uv = 0, neg_voltage_uv = 0; - - indio_dev = iio_device_alloc(sizeof(*st)); - if (indio_dev == NULL) { - ret = -ENOMEM; - goto error_ret; - } - st = iio_priv(indio_dev); - st->reg_vdd = regulator_get(&spi->dev, "vdd"); - if (!IS_ERR(st->reg_vdd)) { - ret = regulator_enable(st->reg_vdd); - if (ret) - goto error_put_reg_pos; - - pos_voltage_uv = regulator_get_voltage(st->reg_vdd); - } - - st->reg_vss = regulator_get(&spi->dev, "vss"); - if (!IS_ERR(st->reg_vss)) { - ret = regulator_enable(st->reg_vss); - if (ret) - goto error_put_reg_neg; - - neg_voltage_uv = regulator_get_voltage(st->reg_vss); - } - - st->pwr_down = true; - st->spi = spi; - - if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) { - st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000; - st->vref_neg_mv = neg_voltage_uv / 1000; - } else if (pdata) { - st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv; - st->vref_neg_mv = pdata->vref_neg_mv; - } else { - dev_warn(&spi->dev, "reference voltage unspecified\n"); - } - - ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET); - if (ret) - goto error_disable_reg_neg; - - st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi) - ->driver_data]; - - - st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv)) - | ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) | - AD5791_CTRL_BIN2SC; - - ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl | - AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI); - if (ret) - goto error_disable_reg_neg; - - spi_set_drvdata(spi, indio_dev); - indio_dev->dev.parent = &spi->dev; - indio_dev->info = &ad5791_info; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels - = &ad5791_channels[spi_get_device_id(spi)->driver_data]; - indio_dev->num_channels = 1; - indio_dev->name = spi_get_device_id(st->spi)->name; - ret = iio_device_register(indio_dev); - if (ret) - goto error_disable_reg_neg; - - return 0; - -error_disable_reg_neg: - if (!IS_ERR(st->reg_vss)) - regulator_disable(st->reg_vss); -error_put_reg_neg: - if (!IS_ERR(st->reg_vss)) - regulator_put(st->reg_vss); - - if (!IS_ERR(st->reg_vdd)) - regulator_disable(st->reg_vdd); -error_put_reg_pos: - if (!IS_ERR(st->reg_vdd)) - regulator_put(st->reg_vdd); - iio_device_free(indio_dev); -error_ret: - - return ret; -} - -static int __devexit ad5791_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - struct ad5791_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - if (!IS_ERR(st->reg_vdd)) { - regulator_disable(st->reg_vdd); - regulator_put(st->reg_vdd); - } - - if (!IS_ERR(st->reg_vss)) { - regulator_disable(st->reg_vss); - regulator_put(st->reg_vss); - } - iio_device_free(indio_dev); - - return 0; -} - -static const struct spi_device_id ad5791_id[] = { - {"ad5760", ID_AD5760}, - {"ad5780", ID_AD5780}, - {"ad5781", ID_AD5781}, - {"ad5790", ID_AD5791}, - {"ad5791", ID_AD5791}, - {} -}; -MODULE_DEVICE_TABLE(spi, ad5791_id); - -static struct spi_driver ad5791_driver = { - .driver = { - .name = "ad5791", - .owner = THIS_MODULE, - }, - .probe = ad5791_probe, - .remove = __devexit_p(ad5791_remove), - .id_table = ad5791_id, -}; -module_spi_driver(ad5791_driver); - -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); -MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC"); -MODULE_LICENSE("GPL v2"); |