iio: Add IIO support for the DAC on the Apex Embedded Systems STX104

The Apex Embedded Systems STX104 is a 16-channel 16-bit analog input and
2-channel 16-bit analog output PC/104 card. The STX104 incorporates a
large one mega-sample FIFO.

This driver provides IIO support for the 2-channel DAC on the STX104.
The base port addresses for the devices may be configured via the "base"
module parameter array.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/MAINTAINERS b/MAINTAINERS
index 7c39a48..3cbff94 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -778,6 +778,12 @@ L: alsa-devel@alsa-project.org (moderated for non-subscribers)
 S:     Maintained
 F:     sound/aoa/
 
+APEX EMBEDDED SYSTEMS STX104 DAC DRIVER
+M:     William Breathitt Gray <vilhelm.gray@gmail.com>
+L:     linux-iio@vger.kernel.org
+S:     Maintained
+F:     drivers/iio/dac/stx104.c
+
 APM DRIVER
 M:     Jiri Kosina <jikos@kernel.org>
 S:     Odd fixes

diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 3c809e2..31a1985 100644 (file)
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -208,4 +208,13 @@ config MCP4922
          To compile this driver as a module, choose M here: the module
          will be called mcp4922.
 
+config STX104
+       tristate "Apex Embedded Systems STX104 DAC driver"
+       depends on ISA
+       help
+         Say yes here to build support for the 2-channel DAC on the Apex
+         Embedded Systems STX104 integrated analog PC/104 card. The base port
+         addresses for the devices may be configured via the "base" module
+         parameter array.
+
 endmenu

diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index cb525b5..e2deda9 100644 (file)
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_MAX517) += max517.o
 obj-$(CONFIG_MAX5821) += max5821.o
 obj-$(CONFIG_MCP4725) += mcp4725.o
 obj-$(CONFIG_MCP4922) += mcp4922.o
+obj-$(CONFIG_STX104) += stx104.o

diff --git a/drivers/iio/dac/stx104.c b/drivers/iio/dac/stx104.c
new file mode 100644 (file)
index 0000000..174f4b7
--- /dev/null
+++ b/drivers/iio/dac/stx104.c
@@ -0,0 +1,152 @@
+/*
+ * DAC driver for the Apex Embedded Systems STX104
+ * Copyright (C) 2016 William Breathitt Gray
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/isa.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#define STX104_NUM_CHAN 2
+
+#define STX104_CHAN(chan) {                            \
+       .type = IIO_VOLTAGE,                            \
+       .channel = chan,                                \
+       .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),   \
+       .indexed = 1,                                   \
+       .output = 1                                     \
+}
+
+#define STX104_EXTENT 16
+/**
+ * The highest base address possible for an ISA device is 0x3FF; this results in
+ * 1024 possible base addresses. Dividing the number of possible base addresses
+ * by the address extent taken by each device results in the maximum number of
+ * devices on a system.
+ */
+#define MAX_NUM_STX104 (1024 / STX104_EXTENT)
+
+static unsigned base[MAX_NUM_STX104];
+static unsigned num_stx104;
+module_param_array(base, uint, &num_stx104, 0);
+MODULE_PARM_DESC(base, "Apex Embedded Systems STX104 base addresses");
+
+/**
+ * struct stx104_iio - IIO device private data structure
+ * @chan_out_states:   channels' output states
+ * @base:              base port address of the IIO device
+ */
+struct stx104_iio {
+       unsigned chan_out_states[STX104_NUM_CHAN];
+       unsigned base;
+};
+
+static int stx104_read_raw(struct iio_dev *indio_dev,
+       struct iio_chan_spec const *chan, int *val, int *val2, long mask)
+{
+       struct stx104_iio *const priv = iio_priv(indio_dev);
+
+       if (mask != IIO_CHAN_INFO_RAW)
+               return -EINVAL;
+
+       *val = priv->chan_out_states[chan->channel];
+
+       return IIO_VAL_INT;
+}
+
+static int stx104_write_raw(struct iio_dev *indio_dev,
+       struct iio_chan_spec const *chan, int val, int val2, long mask)
+{
+       struct stx104_iio *const priv = iio_priv(indio_dev);
+       const unsigned chan_addr_offset = 2 * chan->channel;
+
+       if (mask != IIO_CHAN_INFO_RAW)
+               return -EINVAL;
+
+       priv->chan_out_states[chan->channel] = val;
+       outw(val, priv->base + 4 + chan_addr_offset);
+
+       return 0;
+}
+
+static const struct iio_info stx104_info = {
+       .driver_module = THIS_MODULE,
+       .read_raw = stx104_read_raw,
+       .write_raw = stx104_write_raw
+};
+
+static const struct iio_chan_spec stx104_channels[STX104_NUM_CHAN] = {
+       STX104_CHAN(0),
+       STX104_CHAN(1)
+};
+
+static int stx104_probe(struct device *dev, unsigned int id)
+{
+       struct iio_dev *indio_dev;
+       struct stx104_iio *priv;
+
+       indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
+       if (!indio_dev)
+               return -ENOMEM;
+
+       if (!devm_request_region(dev, base[id], STX104_EXTENT,
+               dev_name(dev))) {
+               dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
+                       base[id], base[id] + STX104_EXTENT);
+               return -EBUSY;
+       }
+
+       indio_dev->info = &stx104_info;
+       indio_dev->modes = INDIO_DIRECT_MODE;
+       indio_dev->channels = stx104_channels;
+       indio_dev->num_channels = STX104_NUM_CHAN;
+       indio_dev->name = dev_name(dev);
+
+       priv = iio_priv(indio_dev);
+       priv->base = base[id];
+
+       /* initialize DAC output to 0V */
+       outw(0, base[id] + 4);
+       outw(0, base[id] + 6);
+
+       return devm_iio_device_register(dev, indio_dev);
+}
+
+static struct isa_driver stx104_driver = {
+       .probe = stx104_probe,
+       .driver = {
+               .name = "stx104"
+       }
+};
+
+static void __exit stx104_exit(void)
+{
+       isa_unregister_driver(&stx104_driver);
+}
+
+static int __init stx104_init(void)
+{
+       return isa_register_driver(&stx104_driver, num_stx104);
+}
+
+module_init(stx104_init);
+module_exit(stx104_exit);
+
+MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
+MODULE_DESCRIPTION("Apex Embedded Systems STX104 DAC driver");
+MODULE_LICENSE("GPL v2");