ad799x-$(CONFIG_AD799X_RING_BUFFER) += ad799x_ring.o
obj-$(CONFIG_AD799X) += ad799x.o
-ad7887-y := ad7887_core.o
-ad7887-$(CONFIG_IIO_BUFFER) += ad7887_ring.o
obj-$(CONFIG_AD7887) += ad7887.o
ad7298-y := ad7298_core.o
--- /dev/null
+/*
+ * AD7887 SPI ADC driver
+ *
+ * Copyright 2010-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.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 "ad7887.h"
+
+#define AD7887_REF_DIS (1 << 5) /* on-chip reference disable */
+#define AD7887_DUAL (1 << 4) /* dual-channel mode */
+#define AD7887_CH_AIN1 (1 << 3) /* convert on channel 1, DUAL=1 */
+#define AD7887_CH_AIN0 (0 << 3) /* convert on channel 0, DUAL=0,1 */
+#define AD7887_PM_MODE1 (0) /* CS based shutdown */
+#define AD7887_PM_MODE2 (1) /* full on */
+#define AD7887_PM_MODE3 (2) /* auto shutdown after conversion */
+#define AD7887_PM_MODE4 (3) /* standby mode */
+
+enum ad7887_channels {
+ AD7887_CH0,
+ AD7887_CH0_CH1,
+ AD7887_CH1,
+};
+
+#define RES_MASK(bits) ((1 << (bits)) - 1)
+
+/**
+ * struct ad7887_chip_info - chip specifc information
+ * @int_vref_mv: the internal reference voltage
+ * @channel: channel specification
+ */
+struct ad7887_chip_info {
+ u16 int_vref_mv;
+ struct iio_chan_spec channel[3];
+};
+
+struct ad7887_state {
+ struct spi_device *spi;
+ const struct ad7887_chip_info *chip_info;
+ struct regulator *reg;
+ struct spi_transfer xfer[4];
+ struct spi_message msg[3];
+ struct spi_message *ring_msg;
+ unsigned char tx_cmd_buf[8];
+
+ /*
+ * DMA (thus cache coherency maintenance) requires the
+ * transfer buffers to live in their own cache lines.
+ * Buffer needs to be large enough to hold two 16 bit samples and a
+ * 64 bit aligned 64 bit timestamp.
+ */
+ unsigned char data[ALIGN(4, sizeof(s64)) + sizeof(s64)]
+ ____cacheline_aligned;
+};
+
+enum ad7887_supported_device_ids {
+ ID_AD7887
+};
+
+static int ad7887_ring_preenable(struct iio_dev *indio_dev)
+{
+ struct ad7887_state *st = iio_priv(indio_dev);
+ int ret;
+
+ ret = iio_sw_buffer_preenable(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ /* We know this is a single long so can 'cheat' */
+ switch (*indio_dev->active_scan_mask) {
+ case (1 << 0):
+ st->ring_msg = &st->msg[AD7887_CH0];
+ break;
+ case (1 << 1):
+ st->ring_msg = &st->msg[AD7887_CH1];
+ /* Dummy read: push CH1 setting down to hardware */
+ spi_sync(st->spi, st->ring_msg);
+ break;
+ case ((1 << 1) | (1 << 0)):
+ st->ring_msg = &st->msg[AD7887_CH0_CH1];
+ break;
+ }
+
+ return 0;
+}
+
+static int ad7887_ring_postdisable(struct iio_dev *indio_dev)
+{
+ struct ad7887_state *st = iio_priv(indio_dev);
+
+ /* dummy read: restore default CH0 settin */
+ return spi_sync(st->spi, &st->msg[AD7887_CH0]);
+}
+
+/**
+ * ad7887_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 ad7887_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ad7887_state *st = iio_priv(indio_dev);
+ s64 time_ns;
+ int b_sent;
+
+ b_sent = spi_sync(st->spi, st->ring_msg);
+ if (b_sent)
+ goto done;
+
+ time_ns = iio_get_time_ns();
+
+ if (indio_dev->scan_timestamp)
+ memcpy(st->data + indio_dev->scan_bytes - sizeof(s64),
+ &time_ns, sizeof(time_ns));
+
+ iio_push_to_buffer(indio_dev->buffer, st->data);
+done:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static const struct iio_buffer_setup_ops ad7887_ring_setup_ops = {
+ .preenable = &ad7887_ring_preenable,
+ .postenable = &iio_triggered_buffer_postenable,
+ .predisable = &iio_triggered_buffer_predisable,
+ .postdisable = &ad7887_ring_postdisable,
+};
+
+static int ad7887_scan_direct(struct ad7887_state *st, unsigned ch)
+{
+ int ret = spi_sync(st->spi, &st->msg[ch]);
+ if (ret)
+ return ret;
+
+ return (st->data[(ch * 2)] << 8) | st->data[(ch * 2) + 1];
+}
+
+static int ad7887_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ int ret;
+ struct ad7887_state *st = iio_priv(indio_dev);
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&indio_dev->mlock);
+ if (iio_buffer_enabled(indio_dev))
+ ret = -EBUSY;
+ else
+ ret = ad7887_scan_direct(st, chan->address);
+ mutex_unlock(&indio_dev->mlock);
+
+ if (ret < 0)
+ return ret;
+ *val = (ret >> st->chip_info->channel[0].scan_type.shift) &
+ RES_MASK(st->chip_info->channel[0].scan_type.realbits);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ if (st->reg) {
+ *val = regulator_get_voltage(st->reg);
+ if (*val < 0)
+ return *val;
+ *val /= 1000;
+ } else {
+ *val = st->chip_info->int_vref_mv;
+ }
+
+ *val2 = st->chip_info->channel[0].scan_type.realbits;
+
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+ return -EINVAL;
+}
+
+
+static const struct ad7887_chip_info ad7887_chip_info_tbl[] = {
+ /*
+ * More devices added in future
+ */
+ [ID_AD7887] = {
+ .channel[0] = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
+ IIO_CHAN_INFO_SCALE_SHARED_BIT,
+ .address = 1,
+ .scan_index = 1,
+ .scan_type = IIO_ST('u', 12, 16, 0),
+ },
+ .channel[1] = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
+ IIO_CHAN_INFO_SCALE_SHARED_BIT,
+ .address = 0,
+ .scan_index = 0,
+ .scan_type = IIO_ST('u', 12, 16, 0),
+ },
+ .channel[2] = IIO_CHAN_SOFT_TIMESTAMP(2),
+ .int_vref_mv = 2500,
+ },
+};
+
+static const struct iio_info ad7887_info = {
+ .read_raw = &ad7887_read_raw,
+ .driver_module = THIS_MODULE,
+};
+
+static int __devinit ad7887_probe(struct spi_device *spi)
+{
+ struct ad7887_platform_data *pdata = spi->dev.platform_data;
+ struct ad7887_state *st;
+ struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
+ int ret;
+
+ if (indio_dev == NULL)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+
+ if (!pdata || !pdata->use_onchip_ref) {
+ st->reg = regulator_get(&spi->dev, "vref");
+ if (IS_ERR(st->reg)) {
+ ret = PTR_ERR(st->reg);
+ goto error_free;
+ }
+
+ ret = regulator_enable(st->reg);
+ if (ret)
+ goto error_put_reg;
+ }
+
+ st->chip_info =
+ &ad7887_chip_info_tbl[spi_get_device_id(spi)->driver_data];
+
+ spi_set_drvdata(spi, indio_dev);
+ st->spi = spi;
+
+ /* Estabilish that the iio_dev is a child of the spi device */
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->name = spi_get_device_id(spi)->name;
+ indio_dev->info = &ad7887_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ /* Setup default message */
+
+ st->tx_cmd_buf[0] = AD7887_CH_AIN0 | AD7887_PM_MODE4 |
+ ((pdata && pdata->use_onchip_ref) ?
+ 0 : AD7887_REF_DIS);
+
+ st->xfer[0].rx_buf = &st->data[0];
+ st->xfer[0].tx_buf = &st->tx_cmd_buf[0];
+ st->xfer[0].len = 2;
+
+ spi_message_init(&st->msg[AD7887_CH0]);
+ spi_message_add_tail(&st->xfer[0], &st->msg[AD7887_CH0]);
+
+ if (pdata && pdata->en_dual) {
+ st->tx_cmd_buf[0] |= AD7887_DUAL | AD7887_REF_DIS;
+
+ st->tx_cmd_buf[2] = AD7887_CH_AIN1 | AD7887_DUAL |
+ AD7887_REF_DIS | AD7887_PM_MODE4;
+ st->tx_cmd_buf[4] = AD7887_CH_AIN0 | AD7887_DUAL |
+ AD7887_REF_DIS | AD7887_PM_MODE4;
+ st->tx_cmd_buf[6] = AD7887_CH_AIN1 | AD7887_DUAL |
+ AD7887_REF_DIS | AD7887_PM_MODE4;
+
+ st->xfer[1].rx_buf = &st->data[0];
+ st->xfer[1].tx_buf = &st->tx_cmd_buf[2];
+ st->xfer[1].len = 2;
+
+ st->xfer[2].rx_buf = &st->data[2];
+ st->xfer[2].tx_buf = &st->tx_cmd_buf[4];
+ st->xfer[2].len = 2;
+
+ spi_message_init(&st->msg[AD7887_CH0_CH1]);
+ spi_message_add_tail(&st->xfer[1], &st->msg[AD7887_CH0_CH1]);
+ spi_message_add_tail(&st->xfer[2], &st->msg[AD7887_CH0_CH1]);
+
+ st->xfer[3].rx_buf = &st->data[0];
+ st->xfer[3].tx_buf = &st->tx_cmd_buf[6];
+ st->xfer[3].len = 2;
+
+ spi_message_init(&st->msg[AD7887_CH1]);
+ spi_message_add_tail(&st->xfer[3], &st->msg[AD7887_CH1]);
+
+ indio_dev->channels = st->chip_info->channel;
+ indio_dev->num_channels = 3;
+ } else {
+ indio_dev->channels = &st->chip_info->channel[1];
+ indio_dev->num_channels = 2;
+ }
+
+ ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+ &ad7887_trigger_handler, &ad7887_ring_setup_ops);
+ if (ret)
+ goto error_disable_reg;
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_unregister_ring;
+
+ return 0;
+error_unregister_ring:
+ iio_triggered_buffer_cleanup(indio_dev);
+error_disable_reg:
+ if (st->reg)
+ regulator_disable(st->reg);
+error_put_reg:
+ if (st->reg)
+ regulator_put(st->reg);
+error_free:
+ iio_device_free(indio_dev);
+
+ return ret;
+}
+
+static int __devexit ad7887_remove(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev = spi_get_drvdata(spi);
+ struct ad7887_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
+ if (st->reg) {
+ regulator_disable(st->reg);
+ regulator_put(st->reg);
+ }
+ iio_device_free(indio_dev);
+
+ return 0;
+}
+
+static const struct spi_device_id ad7887_id[] = {
+ {"ad7887", ID_AD7887},
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad7887_id);
+
+static struct spi_driver ad7887_driver = {
+ .driver = {
+ .name = "ad7887",
+ .owner = THIS_MODULE,
+ },
+ .probe = ad7887_probe,
+ .remove = __devexit_p(ad7887_remove),
+ .id_table = ad7887_id,
+};
+module_spi_driver(ad7887_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD7887 ADC");
+MODULE_LICENSE("GPL v2");
#ifndef IIO_ADC_AD7887_H_
#define IIO_ADC_AD7887_H_
-#define AD7887_REF_DIS (1 << 5) /* on-chip reference disable */
-#define AD7887_DUAL (1 << 4) /* dual-channel mode */
-#define AD7887_CH_AIN1 (1 << 3) /* convert on channel 1, DUAL=1 */
-#define AD7887_CH_AIN0 (0 << 3) /* convert on channel 0, DUAL=0,1 */
-#define AD7887_PM_MODE1 (0) /* CS based shutdown */
-#define AD7887_PM_MODE2 (1) /* full on */
-#define AD7887_PM_MODE3 (2) /* auto shutdown after conversion */
-#define AD7887_PM_MODE4 (3) /* standby mode */
-
-enum ad7887_channels {
- AD7887_CH0,
- AD7887_CH0_CH1,
- AD7887_CH1,
-};
-
-#define RES_MASK(bits) ((1 << (bits)) - 1) /* TODO: move this into a common header */
-
/*
* TODO: struct ad7887_platform_data needs to go into include/linux/iio
*/
bool use_onchip_ref;
};
-/**
- * struct ad7887_chip_info - chip specifc information
- * @int_vref_mv: the internal reference voltage
- * @channel: channel specification
- */
-
-struct ad7887_chip_info {
- u16 int_vref_mv;
- struct iio_chan_spec channel[3];
-};
-
-struct ad7887_state {
- struct spi_device *spi;
- const struct ad7887_chip_info *chip_info;
- struct regulator *reg;
- struct spi_transfer xfer[4];
- struct spi_message msg[3];
- struct spi_message *ring_msg;
- unsigned char tx_cmd_buf[8];
-
- /*
- * DMA (thus cache coherency maintenance) requires the
- * transfer buffers to live in their own cache lines.
- * Buffer needs to be large enough to hold two 16 bit samples and a
- * 64 bit aligned 64 bit timestamp.
- */
- unsigned char data[ALIGN(4, sizeof(s64)) + sizeof(s64)]
- ____cacheline_aligned;
-};
-
-enum ad7887_supported_device_ids {
- ID_AD7887
-};
-
-#ifdef CONFIG_IIO_BUFFER
-int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev);
-void ad7887_ring_cleanup(struct iio_dev *indio_dev);
-#else /* CONFIG_IIO_BUFFER */
-
-static inline int
-ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev)
-{
- return 0;
-}
-
-static inline void ad7887_ring_cleanup(struct iio_dev *indio_dev)
-{
-}
-#endif /* CONFIG_IIO_BUFFER */
#endif /* IIO_ADC_AD7887_H_ */
+++ /dev/null
-/*
- * AD7887 SPI ADC driver
- *
- * Copyright 2010-2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/spi/spi.h>
-#include <linux/regulator/consumer.h>
-#include <linux/err.h>
-#include <linux/module.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include <linux/iio/buffer.h>
-
-
-#include "ad7887.h"
-
-static int ad7887_scan_direct(struct ad7887_state *st, unsigned ch)
-{
- int ret = spi_sync(st->spi, &st->msg[ch]);
- if (ret)
- return ret;
-
- return (st->data[(ch * 2)] << 8) | st->data[(ch * 2) + 1];
-}
-
-static int ad7887_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- int ret;
- struct ad7887_state *st = iio_priv(indio_dev);
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- mutex_lock(&indio_dev->mlock);
- if (iio_buffer_enabled(indio_dev))
- ret = -EBUSY;
- else
- ret = ad7887_scan_direct(st, chan->address);
- mutex_unlock(&indio_dev->mlock);
-
- if (ret < 0)
- return ret;
- *val = (ret >> st->chip_info->channel[0].scan_type.shift) &
- RES_MASK(st->chip_info->channel[0].scan_type.realbits);
- return IIO_VAL_INT;
- case IIO_CHAN_INFO_SCALE:
- if (st->reg) {
- *val = regulator_get_voltage(st->reg);
- if (*val < 0)
- return *val;
- *val /= 1000;
- } else {
- *val = st->chip_info->int_vref_mv;
- }
-
- *val2 = st->chip_info->channel[0].scan_type.realbits;
-
- return IIO_VAL_FRACTIONAL_LOG2;
- }
- return -EINVAL;
-}
-
-
-static const struct ad7887_chip_info ad7887_chip_info_tbl[] = {
- /*
- * More devices added in future
- */
- [ID_AD7887] = {
- .channel[0] = {
- .type = IIO_VOLTAGE,
- .indexed = 1,
- .channel = 1,
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
- IIO_CHAN_INFO_SCALE_SHARED_BIT,
- .address = 1,
- .scan_index = 1,
- .scan_type = IIO_ST('u', 12, 16, 0),
- },
- .channel[1] = {
- .type = IIO_VOLTAGE,
- .indexed = 1,
- .channel = 0,
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
- IIO_CHAN_INFO_SCALE_SHARED_BIT,
- .address = 0,
- .scan_index = 0,
- .scan_type = IIO_ST('u', 12, 16, 0),
- },
- .channel[2] = IIO_CHAN_SOFT_TIMESTAMP(2),
- .int_vref_mv = 2500,
- },
-};
-
-static const struct iio_info ad7887_info = {
- .read_raw = &ad7887_read_raw,
- .driver_module = THIS_MODULE,
-};
-
-static int __devinit ad7887_probe(struct spi_device *spi)
-{
- struct ad7887_platform_data *pdata = spi->dev.platform_data;
- struct ad7887_state *st;
- struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
- int ret;
-
- if (indio_dev == NULL)
- return -ENOMEM;
-
- st = iio_priv(indio_dev);
-
- if (!pdata || !pdata->use_onchip_ref) {
- st->reg = regulator_get(&spi->dev, "vref");
- if (IS_ERR(st->reg)) {
- ret = PTR_ERR(st->reg);
- goto error_free;
- }
-
- ret = regulator_enable(st->reg);
- if (ret)
- goto error_put_reg;
- }
-
- st->chip_info =
- &ad7887_chip_info_tbl[spi_get_device_id(spi)->driver_data];
-
- spi_set_drvdata(spi, indio_dev);
- st->spi = spi;
-
- /* Estabilish that the iio_dev is a child of the spi device */
- indio_dev->dev.parent = &spi->dev;
- indio_dev->name = spi_get_device_id(spi)->name;
- indio_dev->info = &ad7887_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
-
- /* Setup default message */
-
- st->tx_cmd_buf[0] = AD7887_CH_AIN0 | AD7887_PM_MODE4 |
- ((pdata && pdata->use_onchip_ref) ?
- 0 : AD7887_REF_DIS);
-
- st->xfer[0].rx_buf = &st->data[0];
- st->xfer[0].tx_buf = &st->tx_cmd_buf[0];
- st->xfer[0].len = 2;
-
- spi_message_init(&st->msg[AD7887_CH0]);
- spi_message_add_tail(&st->xfer[0], &st->msg[AD7887_CH0]);
-
- if (pdata && pdata->en_dual) {
- st->tx_cmd_buf[0] |= AD7887_DUAL | AD7887_REF_DIS;
-
- st->tx_cmd_buf[2] = AD7887_CH_AIN1 | AD7887_DUAL |
- AD7887_REF_DIS | AD7887_PM_MODE4;
- st->tx_cmd_buf[4] = AD7887_CH_AIN0 | AD7887_DUAL |
- AD7887_REF_DIS | AD7887_PM_MODE4;
- st->tx_cmd_buf[6] = AD7887_CH_AIN1 | AD7887_DUAL |
- AD7887_REF_DIS | AD7887_PM_MODE4;
-
- st->xfer[1].rx_buf = &st->data[0];
- st->xfer[1].tx_buf = &st->tx_cmd_buf[2];
- st->xfer[1].len = 2;
-
- st->xfer[2].rx_buf = &st->data[2];
- st->xfer[2].tx_buf = &st->tx_cmd_buf[4];
- st->xfer[2].len = 2;
-
- spi_message_init(&st->msg[AD7887_CH0_CH1]);
- spi_message_add_tail(&st->xfer[1], &st->msg[AD7887_CH0_CH1]);
- spi_message_add_tail(&st->xfer[2], &st->msg[AD7887_CH0_CH1]);
-
- st->xfer[3].rx_buf = &st->data[0];
- st->xfer[3].tx_buf = &st->tx_cmd_buf[6];
- st->xfer[3].len = 2;
-
- spi_message_init(&st->msg[AD7887_CH1]);
- spi_message_add_tail(&st->xfer[3], &st->msg[AD7887_CH1]);
-
- indio_dev->channels = st->chip_info->channel;
- indio_dev->num_channels = 3;
- } else {
- indio_dev->channels = &st->chip_info->channel[1];
- indio_dev->num_channels = 2;
- }
-
- ret = ad7887_register_ring_funcs_and_init(indio_dev);
- if (ret)
- goto error_disable_reg;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_unregister_ring;
-
- return 0;
-error_unregister_ring:
- ad7887_ring_cleanup(indio_dev);
-error_disable_reg:
- if (st->reg)
- regulator_disable(st->reg);
-error_put_reg:
- if (st->reg)
- regulator_put(st->reg);
-error_free:
- iio_device_free(indio_dev);
-
- return ret;
-}
-
-static int __devexit ad7887_remove(struct spi_device *spi)
-{
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct ad7887_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- ad7887_ring_cleanup(indio_dev);
- if (st->reg) {
- regulator_disable(st->reg);
- regulator_put(st->reg);
- }
- iio_device_free(indio_dev);
-
- return 0;
-}
-
-static const struct spi_device_id ad7887_id[] = {
- {"ad7887", ID_AD7887},
- {}
-};
-MODULE_DEVICE_TABLE(spi, ad7887_id);
-
-static struct spi_driver ad7887_driver = {
- .driver = {
- .name = "ad7887",
- .owner = THIS_MODULE,
- },
- .probe = ad7887_probe,
- .remove = __devexit_p(ad7887_remove),
- .id_table = ad7887_id,
-};
-module_spi_driver(ad7887_driver);
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD7887 ADC");
-MODULE_LICENSE("GPL v2");
+++ /dev/null
-/*
- * Copyright 2010-2012 Analog Devices Inc.
- * Copyright (C) 2008 Jonathan Cameron
- *
- * Licensed under the GPL-2.
- *
- * ad7887_ring.c
- */
-
-#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 "ad7887.h"
-
-/**
- * ad7887_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 ad7887_ring_preenable(struct iio_dev *indio_dev)
-{
- struct ad7887_state *st = iio_priv(indio_dev);
- int ret;
-
- ret = iio_sw_buffer_preenable(indio_dev);
- if (ret < 0)
- return ret;
-
- /* We know this is a single long so can 'cheat' */
- switch (*indio_dev->active_scan_mask) {
- case (1 << 0):
- st->ring_msg = &st->msg[AD7887_CH0];
- break;
- case (1 << 1):
- st->ring_msg = &st->msg[AD7887_CH1];
- /* Dummy read: push CH1 setting down to hardware */
- spi_sync(st->spi, st->ring_msg);
- break;
- case ((1 << 1) | (1 << 0)):
- st->ring_msg = &st->msg[AD7887_CH0_CH1];
- break;
- }
-
- return 0;
-}
-
-static int ad7887_ring_postdisable(struct iio_dev *indio_dev)
-{
- struct ad7887_state *st = iio_priv(indio_dev);
-
- /* dummy read: restore default CH0 settin */
- return spi_sync(st->spi, &st->msg[AD7887_CH0]);
-}
-
-/**
- * ad7887_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 ad7887_trigger_handler(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- struct iio_dev *indio_dev = pf->indio_dev;
- struct ad7887_state *st = iio_priv(indio_dev);
- s64 time_ns;
- int b_sent;
-
- b_sent = spi_sync(st->spi, st->ring_msg);
- if (b_sent)
- goto done;
-
- time_ns = iio_get_time_ns();
-
- if (indio_dev->scan_timestamp)
- memcpy(st->data + indio_dev->scan_bytes - sizeof(s64),
- &time_ns, sizeof(time_ns));
-
- iio_push_to_buffer(indio_dev->buffer, st->data);
-done:
- iio_trigger_notify_done(indio_dev->trig);
-
- return IRQ_HANDLED;
-}
-
-static const struct iio_buffer_setup_ops ad7887_ring_setup_ops = {
- .preenable = &ad7887_ring_preenable,
- .postenable = &iio_triggered_buffer_postenable,
- .predisable = &iio_triggered_buffer_predisable,
- .postdisable = &ad7887_ring_postdisable,
-};
-
-int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev)
-{
- return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
- &ad7887_trigger_handler, &ad7887_ring_setup_ops);
-}
-
-void ad7887_ring_cleanup(struct iio_dev *indio_dev)
-{
- iio_triggered_buffer_cleanup(indio_dev);
-}
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff