[PATCH 105/510] staging: iio: dac: new driver for AD5624R devices
Greg Kroah-Hartman
gregkh at suse.de
Mon Jan 10 20:37:09 UTC 2011
From: Barry Song <barry.song at analog.com>
This is used to convert digital streams into voltages.
Signed-off-by: Barry Song <barry.song at analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich at analog.com>
Acked-by: Jonathan Cameron <jic23 at cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier at gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
drivers/staging/iio/Kconfig | 1 +
drivers/staging/iio/Makefile | 1 +
drivers/staging/iio/dac/Kconfig | 11 ++
drivers/staging/iio/dac/Makefile | 5 +
drivers/staging/iio/dac/ad5624r.h | 21 +++
drivers/staging/iio/dac/ad5624r_spi.c | 313 +++++++++++++++++++++++++++++++++
drivers/staging/iio/dac/dac.h | 6 +
7 files changed, 358 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/iio/dac/Kconfig
create mode 100644 drivers/staging/iio/dac/Makefile
create mode 100644 drivers/staging/iio/dac/ad5624r.h
create mode 100644 drivers/staging/iio/dac/ad5624r_spi.c
create mode 100644 drivers/staging/iio/dac/dac.h
diff --git a/drivers/staging/iio/Kconfig b/drivers/staging/iio/Kconfig
index b8bb5f1..773c301 100644
--- a/drivers/staging/iio/Kconfig
+++ b/drivers/staging/iio/Kconfig
@@ -43,6 +43,7 @@ config IIO_TRIGGER
source "drivers/staging/iio/accel/Kconfig"
source "drivers/staging/iio/adc/Kconfig"
source "drivers/staging/iio/addac/Kconfig"
+source "drivers/staging/iio/dac/Kconfig"
source "drivers/staging/iio/gyro/Kconfig"
source "drivers/staging/iio/imu/Kconfig"
source "drivers/staging/iio/light/Kconfig"
diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile
index 0111647..15eba01 100644
--- a/drivers/staging/iio/Makefile
+++ b/drivers/staging/iio/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_IIO_SW_RING) += ring_sw.o
obj-y += accel/
obj-y += adc/
obj-y += addac/
+obj-y += dac/
obj-y += gyro/
obj-y += imu/
obj-y += light/
diff --git a/drivers/staging/iio/dac/Kconfig b/drivers/staging/iio/dac/Kconfig
new file mode 100644
index 0000000..583df78
--- /dev/null
+++ b/drivers/staging/iio/dac/Kconfig
@@ -0,0 +1,11 @@
+#
+# DAC drivers
+#
+comment "Digital to analog convertors"
+
+config AD5624R_SPI
+ tristate "Analog Devices AD5624/44/64R DAC spi driver"
+ depends on SPI
+ help
+ Say yes here to build support for Analog Devices AD5624R, AD5644R and
+ AD5664R convertors (DAC). This driver uses the common SPI interface.
diff --git a/drivers/staging/iio/dac/Makefile b/drivers/staging/iio/dac/Makefile
new file mode 100644
index 0000000..7ddf05d
--- /dev/null
+++ b/drivers/staging/iio/dac/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for industrial I/O DAC drivers
+#
+
+obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
diff --git a/drivers/staging/iio/dac/ad5624r.h b/drivers/staging/iio/dac/ad5624r.h
new file mode 100644
index 0000000..ce518be
--- /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 0000000..705ff50
--- /dev/null
+++ b/drivers/staging/iio/dac/ad5624r_spi.c
@@ -0,0 +1,313 @@
+/*
+ * 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)
+{
+ struct spi_transfer t;
+ struct spi_message m;
+ 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;
+
+ spi_message_init(&m);
+ memset(&t, 0, (sizeof t));
+ t.tx_buf = &msg[0];
+ t.len = 3;
+
+ spi_message_add_tail(&t, &m);
+ spi_sync(spi, &m);
+
+ return len;
+}
+
+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;
+
+ 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;
+
+ 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;
+
+ 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;
+
+ 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_DAC(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
+static IIO_DEV_ATTR_DAC(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
+static IIO_DEV_ATTR_DAC(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
+static IIO_DEV_ATTR_DAC(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_dac_0.dev_attr.attr,
+ &iio_dev_attr_dac_1.dev_attr.attr,
+ &iio_dev_attr_dac_2.dev_attr.attr,
+ &iio_dev_attr_dac_3.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;
+ char *chip_name = spi->dev.platform_data;
+
+ if (!chip_name)
+ return -ENODEV;
+
+ st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ spi_set_drvdata(spi, st);
+
+ if (strcmp(chip_name, "ad5624r") == 0)
+ st->data_len = 12;
+ else if (strcmp(chip_name, "ad5644r") == 0)
+ st->data_len = 14;
+ else if (strcmp(chip_name, "ad5664r") == 0)
+ st->data_len = 16;
+ else {
+ dev_err(&spi->dev, "not supported chip type\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+
+ 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 struct spi_driver ad5624r_driver = {
+ .driver = {
+ .name = "ad5624r",
+ .owner = THIS_MODULE,
+ },
+ .probe = ad5624r_probe,
+ .remove = __devexit_p(ad5624r_remove),
+};
+
+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 at 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 0000000..55005ee
--- /dev/null
+++ b/drivers/staging/iio/dac/dac.h
@@ -0,0 +1,6 @@
+/*
+ * dac.h - sysfs attributes associated with DACs
+ */
+
+#define IIO_DEV_ATTR_DAC(_num, _store, _addr) \
+ IIO_DEVICE_ATTR(dac_##_num, S_IWUSR, NULL, _store, _addr)
--
1.7.3.2
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