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Date: Mon, 8 Feb 2016 12:50:34 -0500
From: William Breathitt Gray <vilhelm.gray@...il.com>
To: jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
pmeerw@...erw.net
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] 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
stx104_base module parameter array.
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
Changes in v2:
- Inline use of dev_name macro
- Use devm_iio_device_register to simplify cleanup code
- Use ISA bus driver instead of platform driver
- Provide stx104_base module parameter as an array in order to support
multiple instances
MAINTAINERS | 6 ++
drivers/iio/dac/Kconfig | 9 +++
drivers/iio/dac/Makefile | 1 +
drivers/iio/dac/stx104.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 168 insertions(+)
create mode 100644 drivers/iio/dac/stx104.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 6ddb488..3905b31 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -763,6 +763,12 @@ L: alsa-devel@...a-project.org (moderated for non-subscribers)
S: Maintained
F: sound/aoa/
+APEX EMBEDDED SYSTEMS STX104 DAC DRIVER
+M: William Breathitt Gray <vilhelm.gray@...il.com>
+L: linux-iio@...r.kernel.org
+S: Maintained
+F: drivers/iio/dac/stx104.c
+
APM DRIVER
M: Jiri Kosina <jikos@...nel.org>
S: Odd fixes
diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 5dc7150..6cf1066 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -206,4 +206,13 @@ 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 stx104_base module
+ parameter array.
+
endmenu
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index cb525b5..e2deda9 100644
--- 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
index 0000000..f183e3f
--- /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 stx104_base[MAX_NUM_STX104];
+static unsigned num_stx104;
+module_param_array(stx104_base, uint, &num_stx104, 0);
+MODULE_PARM_DESC(stx104_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, stx104_base[id], STX104_EXTENT,
+ dev_name(dev))) {
+ dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
+ stx104_base[id], stx104_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 = stx104_base[id];
+
+ /* initialize DAC output to 0V */
+ outw(0, stx104_base[id] + 4);
+ outw(0, stx104_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@...il.com>");
+MODULE_DESCRIPTION("Apex Embedded Systems STX104 DAC driver");
+MODULE_LICENSE("GPL v2");
--
2.4.10
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