(adis16400 series also have magnetometers).
endmenu
+
+config IIO_ADIS_LIB
+ tristate
+ help
+ A set of IO helper functions for the Analog Devices ADIS* device family.
+
+config IIO_ADIS_LIB_BUFFER
+ bool
+ select IIO_TRIGGER
+ select IIO_SW_RING
+ help
+ A set of buffer helper functions for the Analog Devices ADIS* device
+ family.
adis16400-y := adis16400_core.o
adis16400-$(CONFIG_IIO_BUFFER) += adis16400_ring.o adis16400_trigger.o
obj-$(CONFIG_ADIS16400) += adis16400.o
+
+adis_lib-y += adis.o
+adis_lib-$(CONFIG_IIO_ADIS_LIB_BUFFER) += adis_trigger.o
+adis_lib-$(CONFIG_IIO_ADIS_LIB_BUFFER) += adis_buffer.o
+obj-$(CONFIG_IIO_ADIS_LIB) += adis_lib.o
--- /dev/null
+/*
+ * Common library for ADIS16XXX devices
+ *
+ * Copyright 2012 Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <asm/unaligned.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+
+#include "adis.h"
+
+#define ADIS_MSC_CTRL_DATA_RDY_EN BIT(2)
+#define ADIS_MSC_CTRL_DATA_RDY_POL_HIGH BIT(1)
+#define ADIS_MSC_CTRL_DATA_RDY_DIO2 BIT(0)
+#define ADIS_GLOB_CMD_SW_RESET BIT(7)
+
+/**
+ * adis_write_reg_8() - Write single byte to a register
+ * @adis: The adis device
+ * @reg: The address of the register to be written
+ * @val: The value to write
+ */
+int adis_write_reg_8(struct adis *adis, unsigned int reg, uint8_t val)
+{
+ int ret;
+
+ mutex_lock(&adis->txrx_lock);
+ adis->tx[0] = ADIS_WRITE_REG(reg);
+ adis->tx[1] = val;
+
+ ret = spi_write(adis->spi, adis->tx, 2);
+ mutex_unlock(&adis->txrx_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_write_reg_8);
+
+/**
+ * adis_write_reg_16() - Write 2 bytes to a pair of registers
+ * @adis: The adis device
+ * @reg: The address of the lower of the two registers
+ * @val: Value to be written
+ */
+int adis_write_reg_16(struct adis *adis, unsigned int reg, uint16_t value)
+{
+ int ret;
+ struct spi_message msg;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = adis->tx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = adis->data->write_delay,
+ }, {
+ .tx_buf = adis->tx + 2,
+ .bits_per_word = 8,
+ .len = 2,
+ .delay_usecs = adis->data->write_delay,
+ },
+ };
+
+ mutex_lock(&adis->txrx_lock);
+ adis->tx[0] = ADIS_WRITE_REG(reg);
+ adis->tx[1] = value & 0xff;
+ adis->tx[2] = ADIS_WRITE_REG(reg + 1);
+ adis->tx[3] = (value >> 8) & 0xff;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfers[0], &msg);
+ spi_message_add_tail(&xfers[1], &msg);
+ ret = spi_sync(adis->spi, &msg);
+ mutex_unlock(&adis->txrx_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_write_reg_16);
+
+/**
+ * adis_read_reg_16() - read 2 bytes from a 16-bit register
+ * @adis: The adis device
+ * @reg: The address of the lower of the two registers
+ * @val: The value read back from the device
+ */
+int adis_read_reg_16(struct adis *adis, unsigned int reg, uint16_t *val)
+{
+ struct spi_message msg;
+ int ret;
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = adis->tx,
+ .bits_per_word = 8,
+ .len = 2,
+ .cs_change = 1,
+ .delay_usecs = adis->data->read_delay,
+ }, {
+ .rx_buf = adis->rx,
+ .bits_per_word = 8,
+ .len = 2,
+ .delay_usecs = adis->data->read_delay,
+ },
+ };
+
+ mutex_lock(&adis->txrx_lock);
+ adis->tx[0] = ADIS_READ_REG(reg);
+ adis->tx[1] = 0;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfers[0], &msg);
+ spi_message_add_tail(&xfers[1], &msg);
+ ret = spi_sync(adis->spi, &msg);
+ if (ret) {
+ dev_err(&adis->spi->dev, "Failed to read 16 bit register 0x%02X: %d\n",
+ reg, ret);
+ goto error_ret;
+ }
+ *val = get_unaligned_be16(adis->rx);
+
+error_ret:
+ mutex_unlock(&adis->txrx_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_read_reg_16);
+
+/**
+ * adis_enable_irq() - Enable or disable data ready IRQ
+ * @adis: The adis device
+ * @enable: Whether to enable the IRQ
+ *
+ * Returns 0 on success, negative error code otherwise
+ */
+int adis_enable_irq(struct adis *adis, bool enable)
+{
+ int ret = 0;
+ uint16_t msc;
+
+ ret = adis_read_reg_16(adis, adis->data->msc_ctrl_reg, &msc);
+ if (ret)
+ goto error_ret;
+
+ msc |= ADIS_MSC_CTRL_DATA_RDY_POL_HIGH;
+ msc &= ~ADIS_MSC_CTRL_DATA_RDY_DIO2;
+ if (enable)
+ msc |= ADIS_MSC_CTRL_DATA_RDY_EN;
+ else
+ msc &= ~ADIS_MSC_CTRL_DATA_RDY_EN;
+
+ ret = adis_write_reg_16(adis, adis->data->msc_ctrl_reg, msc);
+
+error_ret:
+ return ret;
+}
+EXPORT_SYMBOL(adis_enable_irq);
+
+/**
+ * adis_check_status() - Check the device for error conditions
+ * @adis: The adis device
+ *
+ * Returns 0 on success, a negative error code otherwise
+ */
+int adis_check_status(struct adis *adis)
+{
+ uint16_t status;
+ int ret;
+ int i;
+
+ ret = adis_read_reg_16(adis, adis->data->diag_stat_reg, &status);
+ if (ret < 0)
+ return ret;
+
+ status &= adis->data->status_error_mask;
+
+ if (status == 0)
+ return 0;
+
+ for (i = 0; i < 16; ++i) {
+ if (status & BIT(i)) {
+ dev_err(&adis->spi->dev, "%s.\n",
+ adis->data->status_error_msgs[i]);
+ }
+ }
+
+ return -EIO;
+}
+EXPORT_SYMBOL_GPL(adis_check_status);
+
+/**
+ * adis_reset() - Reset the device
+ * @adis: The adis device
+ *
+ * Returns 0 on success, a negative error code otherwise
+ */
+int adis_reset(struct adis *adis)
+{
+ int ret;
+
+ ret = adis_write_reg_8(adis, adis->data->glob_cmd_reg,
+ ADIS_GLOB_CMD_SW_RESET);
+ if (ret)
+ dev_err(&adis->spi->dev, "Failed to reset device: %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_reset);
+
+static int adis_self_test(struct adis *adis)
+{
+ int ret;
+
+ ret = adis_write_reg_16(adis, adis->data->msc_ctrl_reg,
+ adis->data->self_test_mask);
+ if (ret) {
+ dev_err(&adis->spi->dev, "Failed to initiate self test: %d\n",
+ ret);
+ return ret;
+ }
+
+ msleep(adis->data->startup_delay);
+
+ return adis_check_status(adis);
+}
+
+/**
+ * adis_inital_startup() - Performs device self-test
+ * @adis: The adis device
+ *
+ * Returns 0 if the device is operational, a negative error code otherwise.
+ *
+ * This function should be called early on in the device initialization sequence
+ * to ensure that the device is in a sane and known state and that it is usable.
+ */
+int adis_initial_startup(struct adis *adis)
+{
+ int ret;
+
+ ret = adis_self_test(adis);
+ if (ret) {
+ dev_err(&adis->spi->dev, "Self-test failed, trying reset.\n");
+ adis_reset(adis);
+ msleep(adis->data->startup_delay);
+ ret = adis_self_test(adis);
+ if (ret) {
+ dev_err(&adis->spi->dev, "Second self-test failed, giving up.\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(adis_initial_startup);
+
+/**
+ * adis_single_conversion() - Performs a single sample conversion
+ * @indio_dev: The IIO device
+ * @chan: The IIO channel
+ * @error_mask: Mask for the error bit
+ * @val: Result of the conversion
+ *
+ * Returns IIO_VAL_INT on success, a negative error code otherwise.
+ *
+ * The function performs a single conversion on a given channel and post
+ * processes the value accordingly to the channel spec. If a error_mask is given
+ * the function will check if the mask is set in the returned raw value. If it
+ * is set the function will perform a self-check. If the device does not report
+ * a error bit in the channels raw value set error_mask to 0.
+ */
+int adis_single_conversion(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, unsigned int error_mask, int *val)
+{
+ struct adis *adis = iio_device_get_drvdata(indio_dev);
+ uint16_t val16;
+ int ret;
+
+ mutex_lock(&indio_dev->mlock);
+
+ ret = adis_read_reg_16(adis, chan->address, &val16);
+ if (ret)
+ goto err_unlock;
+
+ if (val16 & error_mask) {
+ ret = adis_check_status(adis);
+ if (ret)
+ goto err_unlock;
+ }
+
+ if (chan->scan_type.sign == 's')
+ *val = sign_extend32(val16, chan->scan_type.realbits - 1);
+ else
+ *val = val16 & ((1 << chan->scan_type.realbits) - 1);
+
+ ret = IIO_VAL_INT;
+err_unlock:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_single_conversion);
+
+/**
+ * adis_init() - Initialize adis device structure
+ * @adis: The adis device
+ * @indio_dev: The iio device
+ * @spi: The spi device
+ * @data: Chip specific data
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function must be called, before any other adis helper function may be
+ * called.
+ */
+int adis_init(struct adis *adis, struct iio_dev *indio_dev,
+ struct spi_device *spi, const struct adis_data *data)
+{
+ mutex_init(&adis->txrx_lock);
+ adis->spi = spi;
+ adis->data = data;
+ iio_device_set_drvdata(indio_dev, adis);
+
+ return adis_enable_irq(adis, false);
+}
+EXPORT_SYMBOL_GPL(adis_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("Common library code for ADIS16XXX devices");
--- /dev/null
+/*
+ * Common library for ADIS16XXX devices
+ *
+ * Copyright 2012 Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __IIO_ADIS_H__
+#define __IIO_ADIS_H__
+
+#include <linux/spi/spi.h>
+#include <linux/interrupt.h>
+#include <linux/iio/types.h>
+
+#define ADIS_WRITE_REG(reg) (0x80 | (reg))
+#define ADIS_READ_REG(reg) (reg)
+
+/**
+ * struct adis_data - ADIS chip variant specific data
+ * @read_delay: SPI delay for read operations in us
+ * @write_delay: SPI delay for write operations in us
+ * @glob_cmd_reg: Register address of the GLOB_CMD register
+ * @msc_ctrl_reg: Register address of the MSC_CTRL register
+ * @diag_stat_reg: Register address of the DIAG_STAT register
+ * @status_error_msgs: Array of error messgaes
+ * @status_error_mask:
+ */
+struct adis_data {
+ unsigned int read_delay;
+ unsigned int write_delay;
+
+ unsigned int glob_cmd_reg;
+ unsigned int msc_ctrl_reg;
+ unsigned int diag_stat_reg;
+
+ unsigned int self_test_mask;
+ unsigned int startup_delay;
+
+ const char * const *status_error_msgs;
+ unsigned int status_error_mask;
+};
+
+struct adis {
+ struct spi_device *spi;
+ struct iio_trigger *trig;
+
+ const struct adis_data *data;
+
+ struct mutex txrx_lock;
+ struct spi_message msg;
+ struct spi_transfer *xfer;
+ void *buffer;
+
+ uint8_t tx[8] ____cacheline_aligned;
+ uint8_t rx[4];
+};
+
+int adis_init(struct adis *adis, struct iio_dev *indio_dev,
+ struct spi_device *spi, const struct adis_data *data);
+int adis_reset(struct adis *adis);
+
+int adis_write_reg_8(struct adis *adis, unsigned int reg, uint8_t val);
+int adis_write_reg_16(struct adis *adis, unsigned int reg, uint16_t val);
+int adis_read_reg_16(struct adis *adis, unsigned int reg, uint16_t *val);
+
+int adis_enable_irq(struct adis *adis, bool enable);
+int adis_check_status(struct adis *adis);
+
+int adis_initial_startup(struct adis *adis);
+
+int adis_single_conversion(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, unsigned int error_mask,
+ int *val);
+
+#define ADIS_VOLTAGE_CHAN(addr, si, chan, name, bits) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = (chan), \
+ .extend_name = name, \
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
+ .address = (addr), \
+ .scan_index = (si), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = (bits), \
+ .storagebits = 16, \
+ }, \
+}
+
+#define ADIS_SUPPLY_CHAN(addr, si, bits) \
+ ADIS_VOLTAGE_CHAN(addr, si, 0, "supply", bits)
+
+#define ADIS_AUX_ADC_CHAN(addr, si, bits) \
+ ADIS_VOLTAGE_CHAN(addr, si, 1, NULL, bits)
+
+#define ADIS_TEMP_CHAN(addr, si, bits) { \
+ .type = IIO_TEMP, \
+ .indexed = 1, \
+ .channel = 0, \
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT | \
+ IIO_CHAN_INFO_OFFSET_SEPARATE_BIT, \
+ .address = (addr), \
+ .scan_index = (si), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = (bits), \
+ .storagebits = 16, \
+ }, \
+}
+
+#define ADIS_MOD_CHAN(_type, mod, addr, si, info, bits) { \
+ .type = (_type), \
+ .modified = 1, \
+ .channel2 = IIO_MOD_ ## mod, \
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
+ IIO_CHAN_INFO_SCALE_SHARED_BIT | \
+ info, \
+ .address = (addr), \
+ .scan_index = (si), \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = (bits), \
+ .storagebits = 16, \
+ }, \
+}
+
+#define ADIS_ACCEL_CHAN(mod, addr, si, info, bits) \
+ ADIS_MOD_CHAN(IIO_ACCEL, mod, addr, si, info, bits)
+
+#define ADIS_GYRO_CHAN(mod, addr, si, info, bits) \
+ ADIS_MOD_CHAN(IIO_ANGL_VEL, mod, addr, si, info, bits)
+
+#define ADIS_INCLI_CHAN(mod, addr, si, info, bits) \
+ ADIS_MOD_CHAN(IIO_INCLI, mod, addr, si, info, bits)
+
+#define ADIS_ROT_CHAN(mod, addr, si, info, bits) \
+ ADIS_MOD_CHAN(IIO_ROT, mod, addr, si, info, bits)
+
+#ifdef CONFIG_IIO_ADIS_LIB_BUFFER
+
+int adis_setup_buffer_and_trigger(struct adis *adis,
+ struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *));
+void adis_cleanup_buffer_and_trigger(struct adis *adis,
+ struct iio_dev *indio_dev);
+
+int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev);
+void adis_remove_trigger(struct adis *adis);
+
+#else /* CONFIG_IIO_BUFFER */
+
+static inline int adis_setup_buffer_and_trigger(struct adis *adis,
+ struct iio_dev *indio_dev, irqreturn_t (*trigger_handler)(int, void *))
+{
+ return 0;
+}
+
+static inline void adis_cleanup_buffer_and_trigger(struct adis *adis,
+ struct iio_dev *indio_dev)
+{
+}
+
+static inline int adis_probe_trigger(struct adis *adis,
+ struct iio_dev *indio_dev)
+{
+ return 0;
+}
+
+static inline void adis_remove_trigger(struct adis *adis)
+{
+}
+
+#endif /* CONFIG_IIO_BUFFER */
+
+#endif
--- /dev/null
+#include <linux/export.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include "../ring_sw.h"
+#include <linux/iio/trigger_consumer.h>
+
+#include "adis.h"
+
+#define ADIS_MAX_OUTPUTS 12
+
+static int adis_read_buffer_data(struct adis *adis, struct iio_dev *indio_dev)
+{
+ int n_outputs = indio_dev->num_channels;
+ struct spi_transfer xfers[ADIS_MAX_OUTPUTS + 1];
+ struct spi_message msg;
+ int ret;
+ int i;
+
+ mutex_lock(&adis->txrx_lock);
+
+ spi_message_init(&msg);
+
+ memset(xfers, 0, sizeof(xfers));
+ for (i = 0; i <= n_outputs; i++) {
+ xfers[i].bits_per_word = 8;
+ xfers[i].cs_change = 1;
+ xfers[i].len = 2;
+ xfers[i].delay_usecs = adis->data->read_delay;
+ if (i < n_outputs) {
+ xfers[i].tx_buf = adis->tx + 2 * i;
+ adis->tx[2 * i] = indio_dev->channels[i].address;
+ adis->tx[2 * i + 1] = 0;
+ }
+ if (i >= 1)
+ xfers[i].rx_buf = adis->rx + 2 * (i - 1);
+ spi_message_add_tail(&xfers[i], &msg);
+ }
+
+ ret = spi_sync(adis->spi, &msg);
+ if (ret)
+ dev_err(&adis->spi->dev, "Failed to read data: %d", ret);
+
+ mutex_unlock(&adis->txrx_lock);
+
+ return ret;
+}
+
+static irqreturn_t adis_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct adis *adis = iio_device_get_drvdata(indio_dev);
+ u16 *data;
+ int i = 0;
+
+ data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+ if (data == NULL) {
+ dev_err(&adis->spi->dev, "Failed to allocate memory.");
+ return -ENOMEM;
+ }
+
+ if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength)
+ && adis_read_buffer_data(adis, indio_dev) >= 0)
+ for (; i < bitmap_weight(indio_dev->active_scan_mask,
+ indio_dev->masklength); i++)
+ data[i] = be16_to_cpup((__be16 *)&(adis->rx[i*2]));
+
+ /* Guaranteed to be aligned with 8 byte boundary */
+ if (indio_dev->scan_timestamp)
+ *((s64 *)(PTR_ALIGN(data, sizeof(s64)))) = pf->timestamp;
+
+ iio_push_to_buffers(indio_dev, (u8 *)data);
+
+ iio_trigger_notify_done(indio_dev->trig);
+ kfree(data);
+
+ return IRQ_HANDLED;
+}
+
+static const struct iio_buffer_setup_ops adis_buffer_setup_ops = {
+ .preenable = &iio_sw_buffer_preenable,
+ .postenable = &iio_triggered_buffer_postenable,
+ .predisable = &iio_triggered_buffer_predisable,
+};
+
+static int adis_buffer_setup(struct iio_dev *indio_dev,
+ irqreturn_t (*trigger_handler)(int, void *))
+{
+ int ret = 0;
+ struct iio_buffer *buffer;
+
+ if (!trigger_handler)
+ trigger_handler = &adis_trigger_handler;
+
+ buffer = iio_sw_rb_allocate(indio_dev);
+ if (!buffer) {
+ ret = -ENOMEM;
+ return ret;
+ }
+
+ indio_dev->buffer = buffer;
+ indio_dev->setup_ops = &adis_buffer_setup_ops;
+
+ indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
+ trigger_handler,
+ IRQF_ONESHOT,
+ indio_dev,
+ "%s_consumer%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (indio_dev->pollfunc == NULL) {
+ ret = -ENOMEM;
+ goto error_iio_sw_rb_free;
+ }
+
+ indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
+ return 0;
+
+error_iio_sw_rb_free:
+ iio_sw_rb_free(indio_dev->buffer);
+ return ret;
+}
+
+static void adis_buffer_cleanup(struct iio_dev *indio_dev)
+{
+ iio_dealloc_pollfunc(indio_dev->pollfunc);
+ iio_sw_rb_free(indio_dev->buffer);
+}
+
+/**
+ * adis_setup_buffer_and_trigger() - Sets up buffer and trigger for the adis device
+ * @adis: The adis device.
+ * @indio_dev: The IIO device.
+ * @trigger_handler: Optional trigger handler, may be NULL.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ *
+ * This function sets up the buffer and trigger for a adis devices. If
+ * 'trigger_handler' is NULL the default trigger handler will be used. The
+ * default trigger handler will simply read the registers assigned to the
+ * currently active channels.
+ *
+ * adis_cleanup_buffer_and_trigger() should be called to free the resources
+ * allocated by this function.
+ */
+int adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
+ irqreturn_t (*trigger_handler)(int, void *))
+{
+ int ret;
+
+ ret = adis_buffer_setup(indio_dev, trigger_handler);
+ if (ret)
+ return ret;
+
+ ret = iio_buffer_register(indio_dev,
+ indio_dev->channels,
+ indio_dev->num_channels);
+ if (ret) {
+ dev_err(&adis->spi->dev, "Failed to initialize buffer %d\n",
+ ret);
+ goto error_unreg_buffer_funcs;
+ }
+
+ if (adis->spi->irq) {
+ ret = adis_probe_trigger(adis, indio_dev);
+ if (ret)
+ goto error_uninitialize_buffer;
+ }
+ return 0;
+
+error_uninitialize_buffer:
+ iio_buffer_unregister(indio_dev);
+error_unreg_buffer_funcs:
+ adis_buffer_cleanup(indio_dev);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_setup_buffer_and_trigger);
+
+/**
+ * adis_cleanup_buffer_and_trigger() - Free buffer and trigger resources
+ * @adis: The adis device.
+ * @indio_dev: The IIO device.
+ *
+ * Frees resources allocated by adis_setup_buffer_and_trigger()
+ */
+void adis_cleanup_buffer_and_trigger(struct adis *adis,
+ struct iio_dev *indio_dev)
+{
+ if (adis->spi->irq)
+ adis_remove_trigger(adis);
+ iio_buffer_unregister(indio_dev);
+ adis_buffer_cleanup(indio_dev);
+}
+EXPORT_SYMBOL_GPL(adis_cleanup_buffer_and_trigger);
--- /dev/null
+/*
+ * Common library for ADIS16XXX devices
+ *
+ * Copyright 2012 Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/export.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+
+#include "adis.h"
+
+static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig,
+ bool state)
+{
+ struct adis *adis = trig->private_data;
+
+ return adis_enable_irq(adis, state);
+}
+
+static const struct iio_trigger_ops adis_trigger_ops = {
+ .owner = THIS_MODULE,
+ .set_trigger_state = &adis_data_rdy_trigger_set_state,
+};
+
+/**
+ * adis_probe_trigger() - Sets up trigger for a adis device
+ * @adis: The adis device
+ * @indio_dev: The IIO device
+ *
+ * Returns 0 on success or a negative error code
+ *
+ * adis_remove_trigger() should be used to free the trigger.
+ */
+int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
+{
+ int ret;
+
+ adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
+ indio_dev->id);
+ if (adis->trig == NULL)
+ return -ENOMEM;
+
+ ret = request_irq(adis->spi->irq,
+ &iio_trigger_generic_data_rdy_poll,
+ IRQF_TRIGGER_RISING,
+ indio_dev->name,
+ adis->trig);
+ if (ret)
+ goto error_free_trig;
+
+ adis->trig->dev.parent = &adis->spi->dev;
+ adis->trig->ops = &adis_trigger_ops;
+ adis->trig->private_data = adis;
+ ret = iio_trigger_register(adis->trig);
+
+ indio_dev->trig = adis->trig;
+ if (ret)
+ goto error_free_irq;
+
+ return 0;
+
+error_free_irq:
+ free_irq(adis->spi->irq, adis->trig);
+error_free_trig:
+ iio_trigger_free(adis->trig);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(adis_probe_trigger);
+
+/**
+ * adis_remove_trigger() - Remove trigger for a adis devices
+ * @adis: The adis device
+ *
+ * Removes the trigger previously registered with adis_probe_trigger().
+ */
+void adis_remove_trigger(struct adis *adis)
+{
+ iio_trigger_unregister(adis->trig);
+ free_irq(adis->spi->irq, adis->trig);
+ iio_trigger_free(adis->trig);
+}
+EXPORT_SYMBOL_GPL(adis_remove_trigger);
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff