config AD7298
tristate "Analog Devices AD7298 ADC driver"
depends on SPI
- select IIO_TRIGGERED_BUFFER if IIO_BUFFER
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
help
Say yes here to build support for Analog Devices AD7298
8 Channel ADC with temperature sensor.
ad799x-$(CONFIG_AD799X_RING_BUFFER) += ad799x_ring.o
obj-$(CONFIG_AD799X) += ad799x.o
-ad7298-y := ad7298_core.o
-ad7298-$(CONFIG_IIO_BUFFER) += ad7298_ring.o
obj-$(CONFIG_AD7298) += ad7298.o
obj-$(CONFIG_AD7291) += ad7291.o
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/module.h>
+#include <linux/interrupt.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
#include "ad7298.h"
+#define AD7298_WRITE (1 << 15) /* write to the control register */
+#define AD7298_REPEAT (1 << 14) /* repeated conversion enable */
+#define AD7298_CH(x) (1 << (13 - (x))) /* channel select */
+#define AD7298_TSENSE (1 << 5) /* temperature conversion enable */
+#define AD7298_EXTREF (1 << 2) /* external reference enable */
+#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */
+#define AD7298_PDD (1 << 0) /* partial power down enable */
+
+#define AD7298_MAX_CHAN 8
+#define AD7298_BITS 12
+#define AD7298_STORAGE_BITS 16
+#define AD7298_INTREF_mV 2500
+
+#define AD7298_CH_TEMP 9
+
+#define RES_MASK(bits) ((1 << (bits)) - 1)
+
+struct ad7298_state {
+ struct spi_device *spi;
+ struct regulator *reg;
+ unsigned ext_ref;
+ struct spi_transfer ring_xfer[10];
+ struct spi_transfer scan_single_xfer[3];
+ struct spi_message ring_msg;
+ struct spi_message scan_single_msg;
+ /*
+ * DMA (thus cache coherency maintenance) requires the
+ * transfer buffers to live in their own cache lines.
+ */
+ unsigned short rx_buf[12] ____cacheline_aligned;
+ unsigned short tx_buf[2];
+};
+
#define AD7298_V_CHAN(index) \
{ \
.type = IIO_VOLTAGE, \
IIO_CHAN_SOFT_TIMESTAMP(8),
};
+/**
+ * ad7298_update_scan_mode() setup the spi transfer buffer for the new scan mask
+ **/
+static int ad7298_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *active_scan_mask)
+{
+ struct ad7298_state *st = iio_priv(indio_dev);
+ int i, m;
+ unsigned short command;
+ int scan_count;
+
+ /* Now compute overall size */
+ scan_count = bitmap_weight(active_scan_mask, indio_dev->masklength);
+
+ command = AD7298_WRITE | st->ext_ref;
+
+ for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1)
+ if (test_bit(i, active_scan_mask))
+ command |= m;
+
+ st->tx_buf[0] = cpu_to_be16(command);
+
+ /* build spi ring message */
+ st->ring_xfer[0].tx_buf = &st->tx_buf[0];
+ st->ring_xfer[0].len = 2;
+ st->ring_xfer[0].cs_change = 1;
+ st->ring_xfer[1].tx_buf = &st->tx_buf[1];
+ st->ring_xfer[1].len = 2;
+ st->ring_xfer[1].cs_change = 1;
+
+ spi_message_init(&st->ring_msg);
+ spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
+ spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);
+
+ for (i = 0; i < scan_count; i++) {
+ st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i];
+ st->ring_xfer[i + 2].len = 2;
+ st->ring_xfer[i + 2].cs_change = 1;
+ spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg);
+ }
+ /* make sure last transfer cs_change is not set */
+ st->ring_xfer[i + 1].cs_change = 0;
+
+ return 0;
+}
+
+/**
+ * ad7298_trigger_handler() bh of trigger launched polling to ring buffer
+ *
+ * Currently there is no option in this driver to disable the saving of
+ * timestamps within the ring.
+ **/
+static irqreturn_t ad7298_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ad7298_state *st = iio_priv(indio_dev);
+ s64 time_ns = 0;
+ int b_sent;
+
+ b_sent = spi_sync(st->spi, &st->ring_msg);
+ if (b_sent)
+ goto done;
+
+ if (indio_dev->scan_timestamp) {
+ time_ns = iio_get_time_ns();
+ memcpy((u8 *)st->rx_buf + indio_dev->scan_bytes - sizeof(s64),
+ &time_ns, sizeof(time_ns));
+ }
+
+ iio_push_to_buffers(indio_dev, (u8 *)st->rx_buf);
+
+done:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch)
{
int ret;
spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);
spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg);
- ret = ad7298_register_ring_funcs_and_init(indio_dev);
+ ret = iio_triggered_buffer_setup(indio_dev, NULL,
+ &ad7298_trigger_handler, NULL);
if (ret)
goto error_disable_reg;
return 0;
error_cleanup_ring:
- ad7298_ring_cleanup(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
error_disable_reg:
if (st->ext_ref)
regulator_disable(st->reg);
struct ad7298_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
- ad7298_ring_cleanup(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
if (st->ext_ref) {
regulator_disable(st->reg);
regulator_put(st->reg);
#ifndef IIO_ADC_AD7298_H_
#define IIO_ADC_AD7298_H_
-#define AD7298_WRITE (1 << 15) /* write to the control register */
-#define AD7298_REPEAT (1 << 14) /* repeated conversion enable */
-#define AD7298_CH(x) (1 << (13 - (x))) /* channel select */
-#define AD7298_TSENSE (1 << 5) /* temperature conversion enable */
-#define AD7298_EXTREF (1 << 2) /* external reference enable */
-#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */
-#define AD7298_PDD (1 << 0) /* partial power down enable */
-
-#define AD7298_MAX_CHAN 8
-#define AD7298_BITS 12
-#define AD7298_STORAGE_BITS 16
-#define AD7298_INTREF_mV 2500
-
-#define AD7298_CH_TEMP 9
-
-#define RES_MASK(bits) ((1 << (bits)) - 1)
-
/**
* struct ad7298_platform_data - Platform data for the ad7298 ADC driver
* @ext_ref: Whether to use an external reference voltage.
bool ext_ref;
};
-struct ad7298_state {
- struct spi_device *spi;
- struct regulator *reg;
- unsigned ext_ref;
- struct spi_transfer ring_xfer[10];
- struct spi_transfer scan_single_xfer[3];
- struct spi_message ring_msg;
- struct spi_message scan_single_msg;
- /*
- * DMA (thus cache coherency maintenance) requires the
- * transfer buffers to live in their own cache lines.
- */
- unsigned short rx_buf[12] ____cacheline_aligned;
- unsigned short tx_buf[2];
-};
-
-#ifdef CONFIG_IIO_BUFFER
-int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev);
-void ad7298_ring_cleanup(struct iio_dev *indio_dev);
-int ad7298_update_scan_mode(struct iio_dev *indio_dev,
- const unsigned long *active_scan_mask);
-#else /* CONFIG_IIO_BUFFER */
-
-static inline int
-ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
-{
- return 0;
-}
-
-static inline void ad7298_ring_cleanup(struct iio_dev *indio_dev)
-{
-}
-
-#define ad7298_update_scan_mode NULL
-
-#endif /* CONFIG_IIO_BUFFER */
#endif /* IIO_ADC_AD7298_H_ */
+++ /dev/null
-/*
- * AD7298 SPI ADC driver
- *
- * Copyright 2011-2012 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/spi/spi.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/triggered_buffer.h>
-
-#include "ad7298.h"
-
-/**
- * ad7298_update_scan_mode() setup the spi transfer buffer for the new scan mask
- **/
-int ad7298_update_scan_mode(struct iio_dev *indio_dev,
- const unsigned long *active_scan_mask)
-{
- struct ad7298_state *st = iio_priv(indio_dev);
- int i, m;
- unsigned short command;
- int scan_count;
-
- /* Now compute overall size */
- scan_count = bitmap_weight(active_scan_mask, indio_dev->masklength);
-
- command = AD7298_WRITE | st->ext_ref;
-
- for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1)
- if (test_bit(i, active_scan_mask))
- command |= m;
-
- st->tx_buf[0] = cpu_to_be16(command);
-
- /* build spi ring message */
- st->ring_xfer[0].tx_buf = &st->tx_buf[0];
- st->ring_xfer[0].len = 2;
- st->ring_xfer[0].cs_change = 1;
- st->ring_xfer[1].tx_buf = &st->tx_buf[1];
- st->ring_xfer[1].len = 2;
- st->ring_xfer[1].cs_change = 1;
-
- spi_message_init(&st->ring_msg);
- spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
- spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);
-
- for (i = 0; i < scan_count; i++) {
- st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i];
- st->ring_xfer[i + 2].len = 2;
- st->ring_xfer[i + 2].cs_change = 1;
- spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg);
- }
- /* make sure last transfer cs_change is not set */
- st->ring_xfer[i + 1].cs_change = 0;
-
- return 0;
-}
-
-/**
- * ad7298_trigger_handler() bh of trigger launched polling to ring buffer
- *
- * Currently there is no option in this driver to disable the saving of
- * timestamps within the ring.
- **/
-static irqreturn_t ad7298_trigger_handler(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- struct iio_dev *indio_dev = pf->indio_dev;
- struct ad7298_state *st = iio_priv(indio_dev);
- s64 time_ns = 0;
- int b_sent;
-
- b_sent = spi_sync(st->spi, &st->ring_msg);
- if (b_sent)
- goto done;
-
- if (indio_dev->scan_timestamp) {
- time_ns = iio_get_time_ns();
- memcpy((u8 *)st->rx_buf + indio_dev->scan_bytes - sizeof(s64),
- &time_ns, sizeof(time_ns));
- }
-
- iio_push_to_buffers(indio_dev, (u8 *)st->rx_buf);
-
-done:
- iio_trigger_notify_done(indio_dev->trig);
-
- return IRQ_HANDLED;
-}
-
-int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev)
-{
- return iio_triggered_buffer_setup(indio_dev, NULL,
- &ad7298_trigger_handler, NULL);
-}
-
-void ad7298_ring_cleanup(struct iio_dev *indio_dev)
-{
- iio_triggered_buffer_cleanup(indio_dev);
-}
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