diff options
Diffstat (limited to 'drivers/staging/iio/dac/ad5360.c')
-rw-r--r-- | drivers/staging/iio/dac/ad5360.c | 571 |
1 files changed, 0 insertions, 571 deletions
diff --git a/drivers/staging/iio/dac/ad5360.c b/drivers/staging/iio/dac/ad5360.c deleted file mode 100644 index 38660efca78a..000000000000 --- a/drivers/staging/iio/dac/ad5360.c +++ /dev/null @@ -1,571 +0,0 @@ -/* - * Analog devices AD5360, AD5361, AD5362, AD5363, AD5370, AD5371, AD5373 - * multi-channel Digital to Analog Converters driver - * - * Copyright 2011 Analog Devices Inc. - * - * Licensed under the GPL-2. - */ - -#include <linux/device.h> -#include <linux/err.h> -#include <linux/module.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/iio/iio.h> -#include <linux/iio/sysfs.h> -#include "dac.h" - -#define AD5360_CMD(x) ((x) << 22) -#define AD5360_ADDR(x) ((x) << 16) - -#define AD5360_READBACK_TYPE(x) ((x) << 13) -#define AD5360_READBACK_ADDR(x) ((x) << 7) - -#define AD5360_CHAN_ADDR(chan) ((chan) + 0x8) - -#define AD5360_CMD_WRITE_DATA 0x3 -#define AD5360_CMD_WRITE_OFFSET 0x2 -#define AD5360_CMD_WRITE_GAIN 0x1 -#define AD5360_CMD_SPECIAL_FUNCTION 0x0 - -/* Special function register addresses */ -#define AD5360_REG_SF_NOP 0x0 -#define AD5360_REG_SF_CTRL 0x1 -#define AD5360_REG_SF_OFS(x) (0x2 + (x)) -#define AD5360_REG_SF_READBACK 0x5 - -#define AD5360_SF_CTRL_PWR_DOWN BIT(0) - -#define AD5360_READBACK_X1A 0x0 -#define AD5360_READBACK_X1B 0x1 -#define AD5360_READBACK_OFFSET 0x2 -#define AD5360_READBACK_GAIN 0x3 -#define AD5360_READBACK_SF 0x4 - - -/** - * struct ad5360_chip_info - chip specific information - * @channel_template: channel specification template - * @num_channels: number of channels - * @channels_per_group: number of channels per group - * @num_vrefs: number of vref supplies for the chip -*/ - -struct ad5360_chip_info { - struct iio_chan_spec channel_template; - unsigned int num_channels; - unsigned int channels_per_group; - unsigned int num_vrefs; -}; - -/** - * struct ad5360_state - driver instance specific data - * @spi: spi_device - * @chip_info: chip model specific constants, available modes etc - * @vref_reg: vref supply regulators - * @ctrl: control register cache - * @data: spi transfer buffers - */ - -struct ad5360_state { - struct spi_device *spi; - const struct ad5360_chip_info *chip_info; - struct regulator_bulk_data vref_reg[3]; - unsigned int ctrl; - - /* - * DMA (thus cache coherency maintenance) requires the - * transfer buffers to live in their own cache lines. - */ - union { - __be32 d32; - u8 d8[4]; - } data[2] ____cacheline_aligned; -}; - -enum ad5360_type { - ID_AD5360, - ID_AD5361, - ID_AD5362, - ID_AD5363, - ID_AD5370, - ID_AD5371, - ID_AD5372, - ID_AD5373, -}; - -#define AD5360_CHANNEL(bits) { \ - .type = IIO_VOLTAGE, \ - .indexed = 1, \ - .output = 1, \ - .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \ - IIO_CHAN_INFO_SCALE_SEPARATE_BIT | \ - IIO_CHAN_INFO_OFFSET_SEPARATE_BIT | \ - IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT | \ - IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT, \ - .scan_type = IIO_ST('u', (bits), 16, 16 - (bits)) \ -} - -static const struct ad5360_chip_info ad5360_chip_info_tbl[] = { - [ID_AD5360] = { - .channel_template = AD5360_CHANNEL(16), - .num_channels = 16, - .channels_per_group = 8, - .num_vrefs = 2, - }, - [ID_AD5361] = { - .channel_template = AD5360_CHANNEL(14), - .num_channels = 16, - .channels_per_group = 8, - .num_vrefs = 2, - }, - [ID_AD5362] = { - .channel_template = AD5360_CHANNEL(16), - .num_channels = 8, - .channels_per_group = 4, - .num_vrefs = 2, - }, - [ID_AD5363] = { - .channel_template = AD5360_CHANNEL(14), - .num_channels = 8, - .channels_per_group = 4, - .num_vrefs = 2, - }, - [ID_AD5370] = { - .channel_template = AD5360_CHANNEL(16), - .num_channels = 40, - .channels_per_group = 8, - .num_vrefs = 2, - }, - [ID_AD5371] = { - .channel_template = AD5360_CHANNEL(14), - .num_channels = 40, - .channels_per_group = 8, - .num_vrefs = 3, - }, - [ID_AD5372] = { - .channel_template = AD5360_CHANNEL(16), - .num_channels = 32, - .channels_per_group = 8, - .num_vrefs = 2, - }, - [ID_AD5373] = { - .channel_template = AD5360_CHANNEL(14), - .num_channels = 32, - .channels_per_group = 8, - .num_vrefs = 2, - }, -}; - -static unsigned int ad5360_get_channel_vref_index(struct ad5360_state *st, - unsigned int channel) -{ - unsigned int i; - - /* The first groups have their own vref, while the remaining groups - * share the last vref */ - i = channel / st->chip_info->channels_per_group; - if (i >= st->chip_info->num_vrefs) - i = st->chip_info->num_vrefs - 1; - - return i; -} - -static int ad5360_get_channel_vref(struct ad5360_state *st, - unsigned int channel) -{ - unsigned int i = ad5360_get_channel_vref_index(st, channel); - - return regulator_get_voltage(st->vref_reg[i].consumer); -} - - -static int ad5360_write_unlocked(struct iio_dev *indio_dev, - unsigned int cmd, unsigned int addr, unsigned int val, - unsigned int shift) -{ - struct ad5360_state *st = iio_priv(indio_dev); - - val <<= shift; - val |= AD5360_CMD(cmd) | AD5360_ADDR(addr); - st->data[0].d32 = cpu_to_be32(val); - - return spi_write(st->spi, &st->data[0].d8[1], 3); -} - -static int ad5360_write(struct iio_dev *indio_dev, unsigned int cmd, - unsigned int addr, unsigned int val, unsigned int shift) -{ - int ret; - - mutex_lock(&indio_dev->mlock); - ret = ad5360_write_unlocked(indio_dev, cmd, addr, val, shift); - mutex_unlock(&indio_dev->mlock); - - return ret; -} - -static int ad5360_read(struct iio_dev *indio_dev, unsigned int type, - unsigned int addr) -{ - struct ad5360_state *st = iio_priv(indio_dev); - struct spi_message m; - int ret; - struct spi_transfer t[] = { - { - .tx_buf = &st->data[0].d8[1], - .len = 3, - .cs_change = 1, - }, { - .rx_buf = &st->data[1].d8[1], - .len = 3, - }, - }; - - spi_message_init(&m); - spi_message_add_tail(&t[0], &m); - spi_message_add_tail(&t[1], &m); - - mutex_lock(&indio_dev->mlock); - - st->data[0].d32 = cpu_to_be32(AD5360_CMD(AD5360_CMD_SPECIAL_FUNCTION) | - AD5360_ADDR(AD5360_REG_SF_READBACK) | - AD5360_READBACK_TYPE(type) | - AD5360_READBACK_ADDR(addr)); - - ret = spi_sync(st->spi, &m); - if (ret >= 0) - ret = be32_to_cpu(st->data[1].d32) & 0xffff; - - mutex_unlock(&indio_dev->mlock); - - return ret; -} - -static ssize_t ad5360_read_dac_powerdown(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad5360_state *st = iio_priv(indio_dev); - - return sprintf(buf, "%d\n", (bool)(st->ctrl & AD5360_SF_CTRL_PWR_DOWN)); -} - -static int ad5360_update_ctrl(struct iio_dev *indio_dev, unsigned int set, - unsigned int clr) -{ - struct ad5360_state *st = iio_priv(indio_dev); - unsigned int ret; - - mutex_lock(&indio_dev->mlock); - - st->ctrl |= set; - st->ctrl &= ~clr; - - ret = ad5360_write_unlocked(indio_dev, AD5360_CMD_SPECIAL_FUNCTION, - AD5360_REG_SF_CTRL, st->ctrl, 0); - - mutex_unlock(&indio_dev->mlock); - - return ret; -} - -static ssize_t ad5360_write_dac_powerdown(struct device *dev, - struct device_attribute *attr, const char *buf, size_t len) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - bool pwr_down; - int ret; - - ret = strtobool(buf, &pwr_down); - if (ret) - return ret; - - if (pwr_down) - ret = ad5360_update_ctrl(indio_dev, AD5360_SF_CTRL_PWR_DOWN, 0); - else - ret = ad5360_update_ctrl(indio_dev, 0, AD5360_SF_CTRL_PWR_DOWN); - - return ret ? ret : len; -} - -static IIO_DEVICE_ATTR(out_voltage_powerdown, - S_IRUGO | S_IWUSR, - ad5360_read_dac_powerdown, - ad5360_write_dac_powerdown, 0); - -static struct attribute *ad5360_attributes[] = { - &iio_dev_attr_out_voltage_powerdown.dev_attr.attr, - NULL, -}; - -static const struct attribute_group ad5360_attribute_group = { - .attrs = ad5360_attributes, -}; - -static int ad5360_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, - int val2, - long mask) -{ - struct ad5360_state *st = iio_priv(indio_dev); - int max_val = (1 << chan->scan_type.realbits); - unsigned int ofs_index; - - switch (mask) { - case IIO_CHAN_INFO_RAW: - if (val >= max_val || val < 0) - return -EINVAL; - - return ad5360_write(indio_dev, AD5360_CMD_WRITE_DATA, - chan->address, val, chan->scan_type.shift); - - case IIO_CHAN_INFO_CALIBBIAS: - if (val >= max_val || val < 0) - return -EINVAL; - - return ad5360_write(indio_dev, AD5360_CMD_WRITE_OFFSET, - chan->address, val, chan->scan_type.shift); - - case IIO_CHAN_INFO_CALIBSCALE: - if (val >= max_val || val < 0) - return -EINVAL; - - return ad5360_write(indio_dev, AD5360_CMD_WRITE_GAIN, - chan->address, val, chan->scan_type.shift); - - case IIO_CHAN_INFO_OFFSET: - if (val <= -max_val || val > 0) - return -EINVAL; - - val = -val; - - /* offset is supposed to have the same scale as raw, but it - * is always 14bits wide, so on a chip where the raw value has - * more bits, we need to shift offset. */ - val >>= (chan->scan_type.realbits - 14); - - /* There is one DAC offset register per vref. Changing one - * channels offset will also change the offset for all other - * channels which share the same vref supply. */ - ofs_index = ad5360_get_channel_vref_index(st, chan->channel); - return ad5360_write(indio_dev, AD5360_CMD_SPECIAL_FUNCTION, - AD5360_REG_SF_OFS(ofs_index), val, 0); - default: - break; - } - - return -EINVAL; -} - -static int ad5360_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - struct ad5360_state *st = iio_priv(indio_dev); - unsigned int ofs_index; - int scale_uv; - int ret; - - switch (m) { - case IIO_CHAN_INFO_RAW: - ret = ad5360_read(indio_dev, AD5360_READBACK_X1A, - chan->address); - if (ret < 0) - return ret; - *val = ret >> chan->scan_type.shift; - return IIO_VAL_INT; - case IIO_CHAN_INFO_SCALE: - /* vout = 4 * vref * dac_code */ - scale_uv = ad5360_get_channel_vref(st, chan->channel) * 4 * 100; - if (scale_uv < 0) - return scale_uv; - - scale_uv >>= (chan->scan_type.realbits); - *val = scale_uv / 100000; - *val2 = (scale_uv % 100000) * 10; - return IIO_VAL_INT_PLUS_MICRO; - case IIO_CHAN_INFO_CALIBBIAS: - ret = ad5360_read(indio_dev, AD5360_READBACK_OFFSET, - chan->address); - if (ret < 0) - return ret; - *val = ret; - return IIO_VAL_INT; - case IIO_CHAN_INFO_CALIBSCALE: - ret = ad5360_read(indio_dev, AD5360_READBACK_GAIN, - chan->address); - if (ret < 0) - return ret; - *val = ret; - return IIO_VAL_INT; - case IIO_CHAN_INFO_OFFSET: - ofs_index = ad5360_get_channel_vref_index(st, chan->channel); - ret = ad5360_read(indio_dev, AD5360_READBACK_SF, - AD5360_REG_SF_OFS(ofs_index)); - if (ret < 0) - return ret; - - ret <<= (chan->scan_type.realbits - 14); - *val = -ret; - return IIO_VAL_INT; - } - - return -EINVAL; -} - -static const struct iio_info ad5360_info = { - .read_raw = ad5360_read_raw, - .write_raw = ad5360_write_raw, - .attrs = &ad5360_attribute_group, - .driver_module = THIS_MODULE, -}; - -static const char * const ad5360_vref_name[] = { - "vref0", "vref1", "vref2" -}; - -static int __devinit ad5360_alloc_channels(struct iio_dev *indio_dev) -{ - struct ad5360_state *st = iio_priv(indio_dev); - struct iio_chan_spec *channels; - unsigned int i; - - channels = kcalloc(st->chip_info->num_channels, - sizeof(struct iio_chan_spec), GFP_KERNEL); - - if (!channels) - return -ENOMEM; - - for (i = 0; i < st->chip_info->num_channels; ++i) { - channels[i] = st->chip_info->channel_template; - channels[i].channel = i; - channels[i].address = AD5360_CHAN_ADDR(i); - } - - indio_dev->channels = channels; - - return 0; -} - -static int __devinit ad5360_probe(struct spi_device *spi) -{ - enum ad5360_type type = spi_get_device_id(spi)->driver_data; - struct iio_dev *indio_dev; - struct ad5360_state *st; - unsigned int i; - int ret; - - indio_dev = iio_device_alloc(sizeof(*st)); - if (indio_dev == NULL) { - dev_err(&spi->dev, "Failed to allocate iio device\n"); - return -ENOMEM; - } - - st = iio_priv(indio_dev); - spi_set_drvdata(spi, indio_dev); - - st->chip_info = &ad5360_chip_info_tbl[type]; - st->spi = spi; - - indio_dev->dev.parent = &spi->dev; - indio_dev->name = spi_get_device_id(spi)->name; - indio_dev->info = &ad5360_info; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->num_channels = st->chip_info->num_channels; - - ret = ad5360_alloc_channels(indio_dev); - if (ret) { - dev_err(&spi->dev, "Failed to allocate channel spec: %d\n", ret); - goto error_free; - } - - for (i = 0; i < st->chip_info->num_vrefs; ++i) - st->vref_reg[i].supply = ad5360_vref_name[i]; - - ret = regulator_bulk_get(&st->spi->dev, st->chip_info->num_vrefs, - st->vref_reg); - if (ret) { - dev_err(&spi->dev, "Failed to request vref regulators: %d\n", ret); - goto error_free_channels; - } - - ret = regulator_bulk_enable(st->chip_info->num_vrefs, st->vref_reg); - if (ret) { - dev_err(&spi->dev, "Failed to enable vref regulators: %d\n", ret); - goto error_free_reg; - } - - ret = iio_device_register(indio_dev); - if (ret) { - dev_err(&spi->dev, "Failed to register iio device: %d\n", ret); - goto error_disable_reg; - } - - return 0; - -error_disable_reg: - regulator_bulk_disable(st->chip_info->num_vrefs, st->vref_reg); -error_free_reg: - regulator_bulk_free(st->chip_info->num_vrefs, st->vref_reg); -error_free_channels: - kfree(indio_dev->channels); -error_free: - iio_device_free(indio_dev); - - return ret; -} - -static int __devexit ad5360_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - struct ad5360_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - - kfree(indio_dev->channels); - - regulator_bulk_disable(st->chip_info->num_vrefs, st->vref_reg); - regulator_bulk_free(st->chip_info->num_vrefs, st->vref_reg); - - iio_device_free(indio_dev); - - return 0; -} - -static const struct spi_device_id ad5360_ids[] = { - { "ad5360", ID_AD5360 }, - { "ad5361", ID_AD5361 }, - { "ad5362", ID_AD5362 }, - { "ad5363", ID_AD5363 }, - { "ad5370", ID_AD5370 }, - { "ad5371", ID_AD5371 }, - { "ad5372", ID_AD5372 }, - { "ad5373", ID_AD5373 }, - {} -}; -MODULE_DEVICE_TABLE(spi, ad5360_ids); - -static struct spi_driver ad5360_driver = { - .driver = { - .name = "ad5360", - .owner = THIS_MODULE, - }, - .probe = ad5360_probe, - .remove = __devexit_p(ad5360_remove), - .id_table = ad5360_ids, -}; -module_spi_driver(ad5360_driver); - -MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); -MODULE_DESCRIPTION("Analog Devices AD5360/61/62/63/70/71/72/73 DAC"); -MODULE_LICENSE("GPL v2"); |