From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx>
---
drivers/staging/iio/adc/Kconfig | 11 ++
drivers/staging/iio/adc/Makefile | 4 +
drivers/staging/iio/adc/ad7476.h | 66 +++++++++
drivers/staging/iio/adc/ad7476_core.c | 203 ++++++++++++++++++++++++++++
drivers/staging/iio/adc/ad7476_ring.c | 240 +++++++++++++++++++++++++++++++++
5 files changed, 524 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/iio/adc/ad7476.h
create mode 100644 drivers/staging/iio/adc/ad7476_core.c
create mode 100644 drivers/staging/iio/adc/ad7476_ring.c
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
index 59d6fb6..4cb1542 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -75,3 +75,14 @@ config AD7416
help
Say yes here to build support for Analog Devices AD74167/8
temperature sensors and ADC.
+
+config AD7476
+ tristate "Analog Devices AD7475/6/7/8 and AD7495 ADC driver"
+ depends on SPI
+ help
+ Say yes here to build support for Analog Devices AD7475/6/7/8,
+ AD7495 ADC driver.
+ If unsure, say N (but it's safe to say "Y").
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7476.
diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
index e95c8d4..67e6341 100644
--- a/drivers/staging/iio/adc/Makefile
+++ b/drivers/staging/iio/adc/Makefile
@@ -5,6 +5,9 @@
max1363-y := max1363_core.o
max1363-y += max1363_ring.o
+ad7476-y := ad7476_core.o
+ad7476-$(CONFIG_IIO_RING_BUFFER) += ad7476_ring.o
+
obj-$(CONFIG_MAX1363) += max1363.o
obj-$(CONFIG_AD7150) += ad7150.o
obj-$(CONFIG_AD7152) += ad7152.o
@@ -13,3 +16,4 @@ obj-$(CONFIG_AD7298) += ad7298.o
obj-$(CONFIG_AD7314) += ad7314.o
obj-$(CONFIG_AD7414) += ad7414.o
obj-$(CONFIG_AD7416) += ad7416.o
+obj-$(CONFIG_AD7476) += ad7476.o
diff --git a/drivers/staging/iio/adc/ad7476.h b/drivers/staging/iio/adc/ad7476.h
new file mode 100644
index 0000000..fc69f83
--- /dev/null
+++ b/drivers/staging/iio/adc/ad7476.h
@@ -0,0 +1,66 @@
+#ifndef _AD7476_H_
+#define _AD7476_H_
+
+struct ad7476_mode {
+ const char *name;
+ int numvals;
+};
+
+struct ad7476_state {
+ struct iio_dev *indio_dev;
+ struct spi_device *spi;
+ char setupbyte;
+ char configbyte;
+ const struct ad7476_chip_info *chip_info;
+ const struct ad7476_mode *current_mode;
+ struct work_struct poll_work;
+ atomic_t protect_ring;
+ struct iio_trigger *trig;
+ struct spi_transfer xfer;
+ struct spi_message msg;
+ unsigned char data[2];
+};
+
+#define CHIP_NAME "AD7876/7/8"
+
+#ifdef CONFIG_IIO_RING_BUFFER
+
+ssize_t ad7476_scan_from_ring(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+void ad7476_ring_cleanup(struct iio_dev *indio_dev);
+
+int ad7476_initialize_ring(struct iio_ring_buffer *ring);
+void ad7476_uninitialize_ring(struct iio_ring_buffer *ring);
+
+#else /* CONFIG_IIO_RING_BUFFER */
+
+static inline void ad7476_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+}
+
+static inline int ad7476_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return 0;
+}
+
+
+static inline ssize_t ad7476_scan_from_ring(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return 0;
+}
+
+static inline int
+ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+ return 0;
+}
+
+static inline void ad7476_ring_cleanup(struct iio_dev *indio_dev)
+{
+}
+#endif /* CONFIG_IIO_RING_BUFFER */
+#endif /* _AD7476_H_ */
diff --git a/drivers/staging/iio/adc/ad7476_core.c b/drivers/staging/iio/adc/ad7476_core.c
new file mode 100644
index 0000000..7181440
--- /dev/null
+++ b/drivers/staging/iio/adc/ad7476_core.c
@@ -0,0 +1,203 @@
+/*
+ * AD7476/5/7/8 (A) SPI ADC 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 "../iio.h"
+#include "../sysfs.h"
+
+#include "ad7476.h"
+
+static const struct ad7476_mode ad7476_mode_table[] = {
+ {
+ .name = "s0",
+ .numvals = 1,
+ },
+};
+
+static ssize_t ad7476_scan_direct(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7476_state *st = dev_info->dev_data;
+ int ret;
+ struct spi_device *spi = st->spi;
+
+ ret = spi_sync(spi, &st->msg);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", (st->data[0] << 8) | st->data[1]);
+}
+
+static ssize_t ad7476_scan(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ int ret;
+
+ mutex_lock(&dev_info->mlock);
+ if (dev_info->currentmode == INDIO_RING_TRIGGERED)
+ ret = ad7476_scan_from_ring(dev, attr, buf);
+ else
+ ret = ad7476_scan_direct(dev, attr, buf);
+ mutex_unlock(&dev_info->mlock);
+
+ return ret;
+}
+
+/* Cannot query the device, so use local copy of state */
+static ssize_t ad7476_show_scan_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7476_state *st = dev_info->dev_data;
+
+ return sprintf(buf, "%s\n", st->current_mode->name);
+}
+
+
+static IIO_DEV_ATTR_AVAIL_SCAN_MODES(ad7476_show_scan_mode);
+static IIO_DEV_ATTR_SCAN_MODE(S_IRUGO | S_IWUSR,
+ ad7476_show_scan_mode, NULL);
+
+static IIO_DEV_ATTR_SCAN(ad7476_scan);
+
+static ssize_t ad7476_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", CHIP_NAME);
+}
+
+static IIO_DEVICE_ATTR(name, S_IRUGO, ad7476_show_name, NULL, 0);
+
+/*name export */
+
+static struct attribute *ad7476_attributes[] = {
+ &iio_dev_attr_available_scan_modes.dev_attr.attr,
+ &iio_dev_attr_scan_mode.dev_attr.attr,
+ &iio_dev_attr_scan.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7476_attribute_group = {
+ .attrs = ad7476_attributes,
+};
+
+static int __devinit ad7476_probe(struct spi_device *spi)
+{
+ int ret;
+ struct ad7476_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ spi_set_drvdata(spi, st);
+
+ atomic_set(&st->protect_ring, 0);
+ st->spi = spi;
+
+ st->indio_dev = iio_allocate_device();
+ if (st->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_free_st;
+ }
+
+ /* Estabilish that the iio_dev is a child of the i2c device */
+ st->indio_dev->dev.parent = &spi->dev;
+ st->indio_dev->attrs = &ad7476_attribute_group;
+ st->indio_dev->dev_data = (void *)(st);
+ st->indio_dev->driver_module = THIS_MODULE;
+ st->indio_dev->modes = INDIO_DIRECT_MODE;
+
+ st->current_mode = &ad7476_mode_table[0];
+
+ /* Setup default message */
+
+ st->xfer.rx_buf = &st->data;
+ st->xfer.len = st->current_mode->numvals * 2;
+
+ spi_message_init(&st->msg);
+ spi_message_add_tail(&st->xfer, &st->msg);
+
+ ret = ad7476_register_ring_funcs_and_init(st->indio_dev);
+ if (ret)
+ goto error_free_device;
+
+ ret = iio_device_register(st->indio_dev);
+ if (ret)
+ goto error_free_device;
+
+ ret = ad7476_initialize_ring(st->indio_dev->ring);
+ if (ret)
+ goto error_cleanup_ring;
+ return 0;
+
+error_cleanup_ring:
+ ad7476_ring_cleanup(st->indio_dev);
+ iio_device_unregister(st->indio_dev);
+error_free_device:
+ iio_free_device(st->indio_dev);
+error_free_st:
+ kfree(st);
+error_ret:
+ return ret;
+}
+
+static int ad7476_remove(struct spi_device *spi)
+{
+ struct ad7476_state *st = spi_get_drvdata(spi);
+ struct iio_dev *indio_dev = st->indio_dev;
+ ad7476_uninitialize_ring(indio_dev->ring);
+ ad7476_ring_cleanup(indio_dev);
+ iio_device_unregister(indio_dev);
+ kfree(st);
+
+ return 0;
+}
+
+
+static struct spi_driver ad7476_driver = {
+ .driver = {
+ .name = "ad7476",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = ad7476_probe,
+ .remove = __devexit_p(ad7476_remove),
+};
+
+static int __init ad7476_init(void)
+{
+ return spi_register_driver(&ad7476_driver);
+}
+module_init(ad7476_init);
+
+static void __exit ad7476_exit(void)
+{
+ spi_unregister_driver(&ad7476_driver);
+}
+module_exit(ad7476_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@xxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices AD7475/6/7/8(A) ADC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("spi:ad7476");
diff --git a/drivers/staging/iio/adc/ad7476_ring.c b/drivers/staging/iio/adc/ad7476_ring.c
new file mode 100644
index 0000000..c1fe346
--- /dev/null
+++ b/drivers/staging/iio/adc/ad7476_ring.c
@@ -0,0 +1,240 @@
+/*
+ * Copyright 2010 Analog Devices Inc.
+ * Copyright (C) 2008 Jonathan Cameron
+ *
+ * Licensed under the GPL-2 or later.
+ *
+ * ad7476_ring.c
+ */
+
+#include <linux/interrupt.h>
+#include <linux/gpio.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 "../iio.h"
+#include "../ring_generic.h"
+#include "../ring_sw.h"
+#include "../trigger.h"
+#include "../sysfs.h"
+
+#include "ad7476.h"
+
+ssize_t ad7476_scan_from_ring(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7476_state *info = dev_info->dev_data;
+ int i, ret, len = 0;
+ char *ring_data;
+
+ ring_data = kmalloc(info->current_mode->numvals*2, GFP_KERNEL);
+ if (ring_data == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = dev_info->ring->access.read_last(dev_info->ring, ring_data);
+ if (ret)
+ goto error_free_ring_data;
+ len += sprintf(buf+len, "ring ");
+ for (i = 0; i < info->current_mode->numvals; i++)
+ len += sprintf(buf + len, "%d ",
+ ((int)(ring_data[i*2 + 0] & 0xFF) << 8)
+ + ((int)(ring_data[i*2 + 1])));
+ len += sprintf(buf + len, "\n");
+ kfree(ring_data);
+
+ return len;
+
+error_free_ring_data:
+ kfree(ring_data);
+error_ret:
+ return ret;
+}
+
+/**
+ * ad7476_ring_preenable() setup the parameters of the ring before enabling
+ *
+ * The complex nature of the setting of the nuber of bytes per datum is due
+ * to this driver currently ensuring that the timestamp is stored at an 8
+ * byte boundary.
+ **/
+static int ad7476_ring_preenable(struct iio_dev *indio_dev)
+{
+ struct ad7476_state *st = indio_dev->dev_data;
+ size_t d_size;
+
+ if (indio_dev->ring->access.set_bpd) {
+ d_size = st->current_mode->numvals*2 + sizeof(s64);
+ if (d_size % 8)
+ d_size += 8 - (d_size % 8);
+ indio_dev->ring->access.set_bpd(indio_dev->ring, d_size);
+ }
+
+ return 0;
+}
+
+/**
+ * ad7476_ring_postenable() typical ring post enable
+ *
+ * Only not moved into the core for the hardware ring buffer cases
+ * that are more sophisticated.
+ **/
+static int ad7476_ring_postenable(struct iio_dev *indio_dev)
+{
+ if (indio_dev->trig == NULL)
+ return 0;
+ return iio_trigger_attach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+}
+
+/**
+ * ad7476_ring_predisable() runs just prior to ring buffer being disabled
+ *
+ * Typical predisable function which ensures that no trigger events can
+ * occur before we disable the ring buffer (and hence would have no idea
+ * what to do with them)
+ **/
+static int ad7476_ring_predisable(struct iio_dev *indio_dev)
+{
+ if (indio_dev->trig)
+ return iio_trigger_dettach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+ else
+ return 0;
+}
+
+/**
+ * ad7476_poll_func_th() th of trigger launched polling to ring buffer
+ *
+ * As sampling only occurs on i2c comms occuring, leave timestamping until
+ * then. Some triggers will generate their own time stamp. Currently
+ * there is no way of notifying them when no one cares.
+ **/
+void ad7476_poll_func_th(struct iio_dev *indio_dev)
+{
+ struct ad7476_state *st = indio_dev->dev_data;
+
+ schedule_work(&st->poll_work);
+
+ return;
+}
+/**
+ * ad7476_poll_bh_to_ring() bh of trigger launched polling to ring buffer
+ * @work_s: the work struct through which this was scheduled
+ *
+ * Currently there is no option in this driver to disable the saving of
+ * timestamps within the ring.
+ * I think the one copy of this at a time was to avoid problems if the
+ * trigger was set far too high and the reads then locked up the computer.
+ **/
+static void ad7476_poll_bh_to_ring(struct work_struct *work_s)
+{
+ struct ad7476_state *st = container_of(work_s, struct ad7476_state,
+ poll_work);
+ struct iio_dev *indio_dev = st->indio_dev;
+ struct iio_sw_ring_buffer *ring = iio_to_sw_ring(indio_dev->ring);
+ s64 time_ns;
+ __u8 *rxbuf;
+ int b_sent;
+ size_t d_size;
+
+ /* Ensure the timestamp is 8 byte aligned */
+ d_size = st->current_mode->numvals*2 + sizeof(s64);
+ if (d_size % sizeof(s64))
+ d_size += sizeof(s64) - (d_size % sizeof(s64));
+
+ /* Ensure only one copy of this function running at a time */
+ if (atomic_inc_return(&st->protect_ring) > 1)
+ return;
+
+ /* Monitor mode prevents reading. Whilst not currently implemented
+ * might as well have this test in here in the meantime as it does
+ * no harm.
+ */
+ if (st->current_mode->numvals == 0)
+ return;
+
+ rxbuf = kmalloc(d_size, GFP_KERNEL);
+ if (rxbuf == NULL)
+ return;
+
+ b_sent = spi_read(st->spi, rxbuf,
+ st->current_mode->numvals * 2);
+ if (b_sent < 0)
+ goto done;
+
+ time_ns = iio_get_time_ns();
+
+ memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns));
+
+ indio_dev->ring->access.store_to(&ring->buf, rxbuf, time_ns);
+done:
+ kfree(rxbuf);
+ atomic_dec(&st->protect_ring);
+}
+
+
+int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+{
+ struct ad7476_state *st = indio_dev->dev_data;
+ int ret = 0;
+
+ indio_dev->ring = iio_sw_rb_allocate(indio_dev);
+ if (!indio_dev->ring) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ /* Effectively select the ring buffer implementation */
+ iio_ring_sw_register_funcs(&st->indio_dev->ring->access);
+ indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
+ if (indio_dev->pollfunc == NULL) {
+ ret = -ENOMEM;
+ goto error_deallocate_sw_rb;
+ }
+ /* Configure the polling function called on trigger interrupts */
+ indio_dev->pollfunc->poll_func_main = &ad7476_poll_func_th;
+ indio_dev->pollfunc->private_data = indio_dev;
+
+ /* Ring buffer functions - here trigger setup related */
+ indio_dev->ring->postenable = &ad7476_ring_postenable;
+ indio_dev->ring->preenable = &ad7476_ring_preenable;
+ indio_dev->ring->predisable = &ad7476_ring_predisable;
+ INIT_WORK(&st->poll_work, &ad7476_poll_bh_to_ring);
+
+ /* Flag that polled ring buffering is possible */
+ indio_dev->modes |= INDIO_RING_TRIGGERED;
+ return 0;
+error_deallocate_sw_rb:
+ iio_sw_rb_free(indio_dev->ring);
+error_ret:
+ return ret;
+}
+
+void ad7476_ring_cleanup(struct iio_dev *indio_dev)
+{
+ /* ensure that the trigger has been detached */
+ if (indio_dev->trig) {
+ iio_put_trigger(indio_dev->trig);
+ iio_trigger_dettach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+ }
+ kfree(indio_dev->pollfunc);
+ iio_sw_rb_free(indio_dev->ring);
+}
+
+void ad7476_uninitialize_ring(struct iio_ring_buffer *ring)
+{
+ iio_ring_buffer_unregister(ring);
+}
+
+int ad7476_initialize_ring(struct iio_ring_buffer *ring)
+{
+ return iio_ring_buffer_register(ring, 0);
+}
--
1.7.3.2
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