From c2f37c8dcadc77482585e64ef8819f5fd08f26df Mon Sep 17 00:00:00 2001 From: Michael Hennerich Date: Fri, 10 Jun 2011 15:40:49 +0200 Subject: [PATCH] iio: dac: New driver for AD5686R, AD5685R, AD5684R Digital to analog converters New driver for AD5686R, AD5685R, AD5684R Quad channel digital to analog converters Changes since V1: drop header file use strtobool() Fix dev attribute macros Reorder probe() function Signed-off-by: Michael Hennerich Acked-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/dac/Kconfig | 11 + drivers/staging/iio/dac/Makefile | 1 + drivers/staging/iio/dac/ad5686.c | 497 +++++++++++++++++++++++++++++++ 3 files changed, 509 insertions(+) create mode 100644 drivers/staging/iio/dac/ad5686.c diff --git a/drivers/staging/iio/dac/Kconfig b/drivers/staging/iio/dac/Kconfig index d5a5556cf985..7ddae357f20e 100644 --- a/drivers/staging/iio/dac/Kconfig +++ b/drivers/staging/iio/dac/Kconfig @@ -42,6 +42,17 @@ config AD5791 To compile this driver as a module, choose M here: the module will be called ad5791. +config AD5686 + tristate "Analog Devices AD5686R/AD5685R/AD5684R DAC SPI driver" + depends on SPI + help + Say yes here to build support for Analog Devices AD5686R, AD5685R, + AD5684R, AD5791 Voltage Output Digital to + Analog Converter. + + To compile this driver as a module, choose M here: the + module will be called ad5686. + config MAX517 tristate "Maxim MAX517/518/519 DAC driver" depends on I2C && EXPERIMENTAL diff --git a/drivers/staging/iio/dac/Makefile b/drivers/staging/iio/dac/Makefile index 83196de7a54c..7f4f2ed031ec 100644 --- a/drivers/staging/iio/dac/Makefile +++ b/drivers/staging/iio/dac/Makefile @@ -6,4 +6,5 @@ obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o obj-$(CONFIG_AD5504) += ad5504.o obj-$(CONFIG_AD5446) += ad5446.o obj-$(CONFIG_AD5791) += ad5791.o +obj-$(CONFIG_AD5686) += ad5686.o obj-$(CONFIG_MAX517) += max517.o diff --git a/drivers/staging/iio/dac/ad5686.c b/drivers/staging/iio/dac/ad5686.c new file mode 100644 index 000000000000..fd67cfa5edb6 --- /dev/null +++ b/drivers/staging/iio/dac/ad5686.c @@ -0,0 +1,497 @@ +/* + * AD5686R, AD5685R, AD5684R Digital to analog converters driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../iio.h" +#include "../sysfs.h" +#include "dac.h" + +#define AD5686_DAC_CHANNELS 4 + +#define AD5686_ADDR(x) ((x) << 16) +#define AD5686_CMD(x) ((x) << 20) + +#define AD5686_ADDR_DAC0 0x1 +#define AD5686_ADDR_DAC1 0x2 +#define AD5686_ADDR_DAC2 0x4 +#define AD5686_ADDR_DAC3 0x8 +#define AD5686_ADDR_ALL_DAC 0xF + +#define AD5686_CMD_NOOP 0x0 +#define AD5686_CMD_WRITE_INPUT_N 0x1 +#define AD5686_CMD_UPDATE_DAC_N 0x2 +#define AD5686_CMD_WRITE_INPUT_N_UPDATE_N 0x3 +#define AD5686_CMD_POWERDOWN_DAC 0x4 +#define AD5686_CMD_LDAC_MASK 0x5 +#define AD5686_CMD_RESET 0x6 +#define AD5686_CMD_INTERNAL_REFER_SETUP 0x7 +#define AD5686_CMD_DAISY_CHAIN_ENABLE 0x8 +#define AD5686_CMD_READBACK_ENABLE 0x9 + +#define AD5686_LDAC_PWRDN_NONE 0x0 +#define AD5686_LDAC_PWRDN_1K 0x1 +#define AD5686_LDAC_PWRDN_100K 0x2 +#define AD5686_LDAC_PWRDN_3STATE 0x3 + +/** + * struct ad5686_chip_info - chip specific information + * @int_vref_mv: AD5620/40/60: the internal reference voltage + * @channel: channel specification +*/ + +struct ad5686_chip_info { + u16 int_vref_mv; + struct iio_chan_spec channel[AD5686_DAC_CHANNELS]; +}; + +/** + * struct ad5446_state - driver instance specific data + * @spi: spi_device + * @chip_info: chip model specific constants, available modes etc + * @reg: supply regulator + * @vref_mv: actual reference voltage used + * @pwr_down_mask: power down mask + * @pwr_down_mode: current power down mode + * @data: spi transfer buffers + */ + +struct ad5686_state { + struct spi_device *spi; + const struct ad5686_chip_info *chip_info; + struct regulator *reg; + unsigned short vref_mv; + unsigned pwr_down_mask; + unsigned pwr_down_mode; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + + union { + u32 d32; + u8 d8[4]; + } data[3] ____cacheline_aligned; +}; + +/** + * ad5686_supported_device_ids: + */ + +enum ad5686_supported_device_ids { + ID_AD5684, + ID_AD5685, + ID_AD5686, +}; + +static const struct ad5686_chip_info ad5686_chip_info_tbl[] = { + [ID_AD5684] = { + .channel[0] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 0, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC0, + 0, IIO_ST('u', 12, 16, 4), 0), + .channel[1] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 1, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC1, + 1, IIO_ST('u', 12, 16, 4), 0), + .channel[2] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 2, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC2, + 2, IIO_ST('u', 12, 16, 4), 0), + .channel[3] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 3, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC3, + 3, IIO_ST('u', 12, 16, 4), 0), + .int_vref_mv = 2500, + }, + [ID_AD5685] = { + .channel[0] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 0, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC0, + 0, IIO_ST('u', 14, 16, 2), 0), + .channel[1] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 1, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC1, + 1, IIO_ST('u', 14, 16, 2), 0), + .channel[2] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 2, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC2, + 2, IIO_ST('u', 14, 16, 2), 0), + .channel[3] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 3, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC3, + 3, IIO_ST('u', 14, 16, 2), 0), + .int_vref_mv = 2500, + }, + [ID_AD5686] = { + .channel[0] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 0, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC0, + 0, IIO_ST('u', 16, 16, 0), 0), + .channel[1] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 1, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC1, + 1, IIO_ST('u', 16, 16, 0), 0), + .channel[2] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 2, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC2, + 2, IIO_ST('u', 16, 16, 0), 0), + .channel[3] = IIO_CHAN(IIO_OUT, 0, 1, 0, NULL, 3, 0, + (1 << IIO_CHAN_INFO_SCALE_SHARED), + AD5686_ADDR_DAC3, + 3, IIO_ST('u', 16, 16, 0), 0), + .int_vref_mv = 2500, + }, +}; + +static int ad5686_spi_write(struct ad5686_state *st, + u8 cmd, u8 addr, u16 val, u8 shift) +{ + val <<= shift; + + st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | + AD5686_ADDR(addr) | + val); + + return spi_write(st->spi, &st->data[0].d8[1], 3); +} + +static int ad5686_spi_read(struct ad5686_state *st, u8 addr) +{ + struct spi_transfer t[] = { + { + .tx_buf = &st->data[0].d8[1], + .len = 3, + .cs_change = 1, + }, { + .tx_buf = &st->data[1].d8[1], + .rx_buf = &st->data[2].d8[1], + .len = 3, + }, + }; + struct spi_message m; + int ret; + + spi_message_init(&m); + spi_message_add_tail(&t[0], &m); + spi_message_add_tail(&t[1], &m); + + st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) | + AD5686_ADDR(addr)); + st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP)); + + ret = spi_sync(st->spi, &m); + if (ret < 0) + return ret; + + return be32_to_cpu(st->data[2].d32); +} + +static ssize_t ad5686_read_powerdown_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5686_state *st = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"}; + + return sprintf(buf, "%s\n", mode[(st->pwr_down_mode >> + (this_attr->address * 2)) & 0x3]); +} + +static ssize_t ad5686_write_powerdown_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5686_state *st = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + unsigned mode; + + if (sysfs_streq(buf, "1kohm_to_gnd")) + mode = AD5686_LDAC_PWRDN_1K; + else if (sysfs_streq(buf, "100kohm_to_gnd")) + mode = AD5686_LDAC_PWRDN_100K; + else if (sysfs_streq(buf, "three_state")) + mode = AD5686_LDAC_PWRDN_3STATE; + else + return -EINVAL; + + st->pwr_down_mode &= ~(0x3 << (this_attr->address * 2)); + st->pwr_down_mode |= (mode << (this_attr->address * 2)); + + return len; +} + +static ssize_t ad5686_read_dac_powerdown(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5686_state *st = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + return sprintf(buf, "%d\n", !!(st->pwr_down_mask & + (0x3 << (this_attr->address * 2)))); +} + +static ssize_t ad5686_write_dac_powerdown(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + bool readin; + int ret; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5686_state *st = iio_priv(indio_dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = strtobool(buf, &readin); + if (ret) + return ret; + + if (readin == true) + st->pwr_down_mask |= (0x3 << (this_attr->address * 2)); + else + st->pwr_down_mask &= ~(0x3 << (this_attr->address * 2)); + + ret = ad5686_spi_write(st, AD5686_CMD_POWERDOWN_DAC, 0, + st->pwr_down_mask & st->pwr_down_mode, 0); + + return ret ? ret : len; +} + +static IIO_CONST_ATTR(out_powerdown_mode_available, + "1kohm_to_gnd 100kohm_to_gnd three_state"); + +#define IIO_DEV_ATTR_DAC_POWERDOWN_MODE(_num) \ + IIO_DEVICE_ATTR(out##_num##_powerdown_mode, S_IRUGO | S_IWUSR, \ + ad5686_read_powerdown_mode, \ + ad5686_write_powerdown_mode, _num) + +static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(0); +static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(1); +static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(2); +static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(3); + +#define IIO_DEV_ATTR_DAC_POWERDOWN(_num) \ + IIO_DEVICE_ATTR(out##_num##_powerdown, S_IRUGO | S_IWUSR, \ + ad5686_read_dac_powerdown, \ + ad5686_write_dac_powerdown, _num) + +static IIO_DEV_ATTR_DAC_POWERDOWN(0); +static IIO_DEV_ATTR_DAC_POWERDOWN(1); +static IIO_DEV_ATTR_DAC_POWERDOWN(2); +static IIO_DEV_ATTR_DAC_POWERDOWN(3); + +static struct attribute *ad5686_attributes[] = { + &iio_dev_attr_out0_powerdown.dev_attr.attr, + &iio_dev_attr_out1_powerdown.dev_attr.attr, + &iio_dev_attr_out2_powerdown.dev_attr.attr, + &iio_dev_attr_out3_powerdown.dev_attr.attr, + &iio_dev_attr_out0_powerdown_mode.dev_attr.attr, + &iio_dev_attr_out1_powerdown_mode.dev_attr.attr, + &iio_dev_attr_out2_powerdown_mode.dev_attr.attr, + &iio_dev_attr_out3_powerdown_mode.dev_attr.attr, + &iio_const_attr_out_powerdown_mode_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad5686_attribute_group = { + .attrs = ad5686_attributes, +}; + +static int ad5686_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad5686_state *st = iio_priv(indio_dev); + unsigned long scale_uv; + int ret; + + switch (m) { + case 0: + mutex_lock(&indio_dev->mlock); + ret = ad5686_spi_read(st, chan->address); + mutex_unlock(&indio_dev->mlock); + if (ret < 0) + return ret; + *val = ret; + return IIO_VAL_INT; + break; + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + scale_uv = (st->vref_mv * 100000) + >> (chan->scan_type.realbits); + *val = scale_uv / 100000; + *val2 = (scale_uv % 100000) * 10; + return IIO_VAL_INT_PLUS_MICRO; + + } + return -EINVAL; +} + +static int ad5686_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ad5686_state *st = iio_priv(indio_dev); + int ret; + + switch (mask) { + case 0: + if (val > (1 << chan->scan_type.realbits)) + return -EINVAL; + + mutex_lock(&indio_dev->mlock); + ret = ad5686_spi_write(st, + AD5686_CMD_WRITE_INPUT_N_UPDATE_N, + chan->address, + val, + chan->scan_type.shift); + mutex_unlock(&indio_dev->mlock); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static const struct iio_info ad5686_info = { + .read_raw = ad5686_read_raw, + .write_raw = ad5686_write_raw, + .attrs = &ad5686_attribute_group, + .driver_module = THIS_MODULE, +}; + +static int __devinit ad5686_probe(struct spi_device *spi) +{ + struct ad5686_state *st; + struct iio_dev *indio_dev; + int ret, regdone = 0, voltage_uv = 0; + + indio_dev = iio_allocate_device(sizeof(*st)); + if (indio_dev == NULL) + return -ENOMEM; + + st = iio_priv(indio_dev); + spi_set_drvdata(spi, indio_dev); + + 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 = + &ad5686_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + if (voltage_uv) + st->vref_mv = voltage_uv / 1000; + else + st->vref_mv = st->chip_info->int_vref_mv; + + st->spi = spi; + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->info = &ad5686_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = st->chip_info->channel; + indio_dev->num_channels = AD5686_DAC_CHANNELS; + + ret = iio_device_register(indio_dev); + if (ret) + goto error_disable_reg; + + regdone = 1; + ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0, + !!voltage_uv, 0); + if (ret) + goto error_disable_reg; + + return 0; + +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_put_reg: + if (!IS_ERR(st->reg)) + regulator_put(st->reg); + + if (regdone) + iio_device_unregister(indio_dev); + else + iio_free_device(indio_dev); + + return ret; +} + +static int __devexit ad5686_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ad5686_state *st = iio_priv(indio_dev); + struct regulator *reg = st->reg; + + if (!IS_ERR(reg)) { + regulator_disable(reg); + regulator_put(reg); + } + + iio_device_unregister(indio_dev); + + return 0; +} + +static const struct spi_device_id ad5686_id[] = { + {"ad5684", ID_AD5684}, + {"ad5685", ID_AD5685}, + {"ad5686", ID_AD5686}, + {} +}; + +static struct spi_driver ad5686_driver = { + .driver = { + .name = "ad5686", + .owner = THIS_MODULE, + }, + .probe = ad5686_probe, + .remove = __devexit_p(ad5686_remove), + .id_table = ad5686_id, +}; + +static __init int ad5686_spi_init(void) +{ + return spi_register_driver(&ad5686_driver); +} +module_init(ad5686_spi_init); + +static __exit void ad5686_spi_exit(void) +{ + spi_unregister_driver(&ad5686_driver); +} +module_exit(ad5686_spi_exit); + +MODULE_AUTHOR("Michael Hennerich "); +MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC"); +MODULE_LICENSE("GPL v2");