diff options
Diffstat (limited to 'drivers/staging/iio/dac')
-rw-r--r-- | drivers/staging/iio/dac/Kconfig | 21 | ||||
-rw-r--r-- | drivers/staging/iio/dac/Makefile | 6 | ||||
-rw-r--r-- | drivers/staging/iio/dac/ad5446.c | 323 | ||||
-rw-r--r-- | drivers/staging/iio/dac/ad5446.h | 96 | ||||
-rw-r--r-- | drivers/staging/iio/dac/ad5624r.h | 21 | ||||
-rw-r--r-- | drivers/staging/iio/dac/ad5624r_spi.c | 300 | ||||
-rw-r--r-- | drivers/staging/iio/dac/dac.h | 6 |
7 files changed, 773 insertions, 0 deletions
diff --git a/drivers/staging/iio/dac/Kconfig b/drivers/staging/iio/dac/Kconfig new file mode 100644 index 00000000000..9191bd23cc0 --- /dev/null +++ b/drivers/staging/iio/dac/Kconfig @@ -0,0 +1,21 @@ +# +# DAC drivers +# +comment "Digital to analog convertors" + +config AD5624R_SPI + tristate "Analog Devices AD5624/44/64R DAC spi driver" + depends on 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 AD5444/6, AD5620/40/60 and AD5541A/12A DAC SPI driver" + depends on SPI + help + Say yes here to build support for Analog Devices AD5444, AD5446, + AD5620, AD5640, AD5660 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 new file mode 100644 index 00000000000..7cf331b4e00 --- /dev/null +++ b/drivers/staging/iio/dac/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for industrial I/O DAC drivers +# + +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 00000000000..0f87ecac82f --- /dev/null +++ b/drivers/staging/iio/dac/ad5446.c @@ -0,0 +1,323 @@ +/* + * 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"); diff --git a/drivers/staging/iio/dac/ad5446.h b/drivers/staging/iio/dac/ad5446.h new file mode 100644 index 00000000000..902542e22c4 --- /dev/null +++ b/drivers/staging/iio/dac/ad5446.h @@ -0,0 +1,96 @@ +/* + * AD5446 SPI DAC driver + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ +#ifndef IIO_DAC_AD5446_H_ +#define IIO_DAC_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 AD5620_LOAD (0x0 << 14) /* Load and update Norm Operation*/ +#define AD5620_PWRDWN_1k (0x1 << 14) /* Power-down: 1kOhm to GND */ +#define AD5620_PWRDWN_100k (0x2 << 14) /* Power-down: 100kOhm to GND */ +#define AD5620_PWRDWN_TRISTATE (0x3 << 14) /* Power-down: Three-state */ + +#define AD5660_LOAD (0x0 << 16) /* Load and update Norm Operation*/ +#define AD5660_PWRDWN_1k (0x1 << 16) /* Power-down: 1kOhm to GND */ +#define AD5660_PWRDWN_100k (0x2 << 16) /* Power-down: 100kOhm to GND */ +#define AD5660_PWRDWN_TRISTATE (0x3 << 16) /* Power-down: Three-state */ + +#define RES_MASK(bits) ((1 << (bits)) - 1) + +/** + * struct ad5446_state - driver instance specific data + * @indio_dev: the industrial I/O device + * @spi: spi_device + * @chip_info: chip model specific constants, available modes etc + * @reg: supply regulator + * @poll_work: bottom half of polling interrupt handler + * @vref_mv: actual reference voltage used + * @xfer: default spi transfer + * @msg: default spi message + * @data: spi transmit buffer + */ + +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; + union { + unsigned short d16; + unsigned char d24[3]; + } data; +}; + +/** + * struct ad5446_chip_info - chip specific information + * @bits: accuracy of the DAC in bits + * @storagebits: number of bits written to the DAC + * @left_shift: number of bits the datum must be shifted + * @int_vref_mv: AD5620/40/60: the internal reference voltage + * @store_sample: chip specific helper function to store the datum + */ + +struct ad5446_chip_info { + u8 bits; + u8 storagebits; + u8 left_shift; + u16 int_vref_mv; + void (*store_sample) (struct ad5446_state *st, unsigned val); +}; + +/** + * ad5446_supported_device_ids: + * The AD5620/40/60 parts are available in different fixed internal reference + * voltage options. The actual part numbers may look differently + * (and a bit cryptic), however this style is used to make clear which + * parts are supported here. + */ + +enum ad5446_supported_device_ids { + ID_AD5444, + ID_AD5446, + ID_AD5542A, + ID_AD5512A, + ID_AD5620_2500, + ID_AD5620_1250, + ID_AD5640_2500, + ID_AD5640_1250, + ID_AD5660_2500, + ID_AD5660_1250, +}; + +#endif /* IIO_DAC_AD5446_H_ */ diff --git a/drivers/staging/iio/dac/ad5624r.h b/drivers/staging/iio/dac/ad5624r.h new file mode 100644 index 00000000000..ce518be652b --- /dev/null +++ b/drivers/staging/iio/dac/ad5624r.h @@ -0,0 +1,21 @@ +#ifndef SPI_AD5624R_H_ +#define SPI_AD5624R_H_ + +#define AD5624R_DAC_CHANNELS 4 + +#define AD5624R_ADDR_DAC0 0x0 +#define AD5624R_ADDR_DAC1 0x1 +#define AD5624R_ADDR_DAC2 0x2 +#define AD5624R_ADDR_DAC3 0x3 +#define AD5624R_ADDR_ALL_DAC 0x7 + +#define AD5624R_CMD_WRITE_INPUT_N 0x0 +#define AD5624R_CMD_UPDATE_DAC_N 0x1 +#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2 +#define AD5624R_CMD_WRITE_INPUT_N_UPDATE_N 0x3 +#define AD5624R_CMD_POWERDOWN_DAC 0x4 +#define AD5624R_CMD_RESET 0x5 +#define AD5624R_CMD_LDAC_SETUP 0x6 +#define AD5624R_CMD_INTERNAL_REFER_SETUP 0x7 + +#endif diff --git a/drivers/staging/iio/dac/ad5624r_spi.c b/drivers/staging/iio/dac/ad5624r_spi.c new file mode 100644 index 00000000000..2b1c6dde4fd --- /dev/null +++ b/drivers/staging/iio/dac/ad5624r_spi.c @@ -0,0 +1,300 @@ +/* + * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/interrupt.h> +#include <linux/gpio.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/delay.h> + +#include "../iio.h" +#include "../sysfs.h" +#include "dac.h" +#include "ad5624r.h" + +/** + * struct ad5624r_state - device related storage + * @indio_dev: associated industrial IO device + * @us: spi device + **/ +struct ad5624r_state { + struct iio_dev *indio_dev; + struct spi_device *us; + int data_len; + int ldac_mode; + int dac_power_mode[AD5624R_DAC_CHANNELS]; + int internal_ref; +}; + +static int ad5624r_spi_write(struct spi_device *spi, + u8 cmd, u8 addr, u16 val, u8 len) +{ + u32 data; + u8 msg[3]; + + /* + * The input shift register is 24 bits wide. The first two bits are don't care bits. + * The next three are the command bits, C2 to C0, followed by the 3-bit DAC address, + * A2 to A0, and then the 16-, 14-, 12-bit data-word. The data-word comprises the 16-, + * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, for the AD5664R, + * AD5644R, and AD5624R, respectively. + */ + data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len)); + msg[0] = data >> 16; + msg[1] = data >> 8; + msg[2] = data; + + return spi_write(spi, msg, 3); +} + +static ssize_t ad5624r_write_dac(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + long readin; + int ret; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5624r_state *st = indio_dev->dev_data; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = strict_strtol(buf, 10, &readin); + if (ret) + return ret; + + ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, + this_attr->address, readin, st->data_len); + return ret ? ret : len; +} + +static ssize_t ad5624r_read_ldac_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5624r_state *st = indio_dev->dev_data; + + return sprintf(buf, "%x\n", st->ldac_mode); +} + +static ssize_t ad5624r_write_ldac_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + long readin; + int ret; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5624r_state *st = indio_dev->dev_data; + + ret = strict_strtol(buf, 16, &readin); + if (ret) + return ret; + + ret = ad5624r_spi_write(st->us, AD5624R_CMD_LDAC_SETUP, 0, + readin & 0xF, 16); + st->ldac_mode = readin & 0xF; + + return ret ? ret : len; +} + +static ssize_t ad5624r_read_dac_power_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5624r_state *st = indio_dev->dev_data; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + return sprintf(buf, "%d\n", st->dac_power_mode[this_attr->address]); +} + +static ssize_t ad5624r_write_dac_power_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + long readin; + int ret; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5624r_state *st = indio_dev->dev_data; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + + ret = strict_strtol(buf, 10, &readin); + if (ret) + return ret; + + ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0, + ((readin & 0x3) << 4) | + (1 << this_attr->address), 16); + + st->dac_power_mode[this_attr->address] = readin & 0x3; + + return ret ? ret : len; +} + +static ssize_t ad5624r_read_internal_ref_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5624r_state *st = indio_dev->dev_data; + + return sprintf(buf, "%d\n", st->internal_ref); +} + +static ssize_t ad5624r_write_internal_ref_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + long readin; + int ret; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad5624r_state *st = indio_dev->dev_data; + + ret = strict_strtol(buf, 10, &readin); + if (ret) + return ret; + + ret = ad5624r_spi_write(st->us, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, + !!readin, 16); + + st->internal_ref = !!readin; + + return ret ? ret : len; +} + +static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0); +static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1); +static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2); +static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3); + +static IIO_DEVICE_ATTR(ldac_mode, S_IRUGO | S_IWUSR, ad5624r_read_ldac_mode, + ad5624r_write_ldac_mode, 0); +static IIO_DEVICE_ATTR(internal_ref, S_IRUGO | S_IWUSR, + ad5624r_read_internal_ref_mode, + ad5624r_write_internal_ref_mode, 0); + +#define IIO_DEV_ATTR_DAC_POWER_MODE(_num, _show, _store, _addr) \ + IIO_DEVICE_ATTR(dac_power_mode_##_num, S_IRUGO | S_IWUSR, _show, _store, _addr) + +static IIO_DEV_ATTR_DAC_POWER_MODE(0, ad5624r_read_dac_power_mode, + ad5624r_write_dac_power_mode, 0); +static IIO_DEV_ATTR_DAC_POWER_MODE(1, ad5624r_read_dac_power_mode, + ad5624r_write_dac_power_mode, 1); +static IIO_DEV_ATTR_DAC_POWER_MODE(2, ad5624r_read_dac_power_mode, + ad5624r_write_dac_power_mode, 2); +static IIO_DEV_ATTR_DAC_POWER_MODE(3, ad5624r_read_dac_power_mode, + ad5624r_write_dac_power_mode, 3); + +static struct attribute *ad5624r_attributes[] = { + &iio_dev_attr_out0_raw.dev_attr.attr, + &iio_dev_attr_out1_raw.dev_attr.attr, + &iio_dev_attr_out2_raw.dev_attr.attr, + &iio_dev_attr_out3_raw.dev_attr.attr, + &iio_dev_attr_dac_power_mode_0.dev_attr.attr, + &iio_dev_attr_dac_power_mode_1.dev_attr.attr, + &iio_dev_attr_dac_power_mode_2.dev_attr.attr, + &iio_dev_attr_dac_power_mode_3.dev_attr.attr, + &iio_dev_attr_ldac_mode.dev_attr.attr, + &iio_dev_attr_internal_ref.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad5624r_attribute_group = { + .attrs = ad5624r_attributes, +}; + +static int __devinit ad5624r_probe(struct spi_device *spi) +{ + struct ad5624r_state *st; + int ret = 0; + + st = kzalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) { + ret = -ENOMEM; + goto error_ret; + } + spi_set_drvdata(spi, st); + + st->data_len = spi_get_device_id(spi)->driver_data; + + st->us = spi; + st->indio_dev = iio_allocate_device(); + if (st->indio_dev == NULL) { + ret = -ENOMEM; + goto error_free_st; + } + st->indio_dev->dev.parent = &spi->dev; + st->indio_dev->num_interrupt_lines = 0; + st->indio_dev->event_attrs = NULL; + + st->indio_dev->attrs = &ad5624r_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + ret = iio_device_register(st->indio_dev); + if (ret) + goto error_free_dev; + + spi->mode = SPI_MODE_0; + spi_setup(spi); + + return 0; + +error_free_dev: + iio_free_device(st->indio_dev); +error_free_st: + kfree(st); +error_ret: + return ret; +} + +static int __devexit ad5624r_remove(struct spi_device *spi) +{ + struct ad5624r_state *st = spi_get_drvdata(spi); + + iio_device_unregister(st->indio_dev); + kfree(st); + + return 0; +} + +static const struct spi_device_id ad5624r_id[] = { + {"ad5624r", 12}, + {"ad5644r", 14}, + {"ad5664r", 16}, + {} +}; + +static struct spi_driver ad5624r_driver = { + .driver = { + .name = "ad5624r", + .owner = THIS_MODULE, + }, + .probe = ad5624r_probe, + .remove = __devexit_p(ad5624r_remove), + .id_table = ad5624r_id, +}; + +static __init int ad5624r_spi_init(void) +{ + return spi_register_driver(&ad5624r_driver); +} +module_init(ad5624r_spi_init); + +static __exit void ad5624r_spi_exit(void) +{ + spi_unregister_driver(&ad5624r_driver); +} +module_exit(ad5624r_spi_exit); + +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/staging/iio/dac/dac.h b/drivers/staging/iio/dac/dac.h new file mode 100644 index 00000000000..1d82f353241 --- /dev/null +++ b/drivers/staging/iio/dac/dac.h @@ -0,0 +1,6 @@ +/* + * dac.h - sysfs attributes associated with DACs + */ + +#define IIO_DEV_ATTR_OUT_RAW(_num, _store, _addr) \ + IIO_DEVICE_ATTR(out##_num##_raw, S_IWUSR, NULL, _store, _addr) |