Signed-off-by: Jiri Kosina<jkosina@xxxxxxx>
---
Documentation/iio/device.txt | 81 +++
Documentation/iio/generic_buffer.c | 329 ++++++++++
Documentation/iio/iio_event_monitor.c | 241 ++++++++
Documentation/iio/iio_utils.h | 639 ++++++++++++++++++++
Documentation/iio/inkernel.txt | 58 ++
Documentation/iio/overview.txt | 57 ++
Documentation/iio/ring.txt | 47 ++
drivers/staging/iio/Documentation/device.txt | 81 ---
drivers/staging/iio/Documentation/generic_buffer.c | 329 ----------
.../staging/iio/Documentation/iio_event_monitor.c | 241 --------
drivers/staging/iio/Documentation/iio_utils.h | 639 --------------------
drivers/staging/iio/Documentation/inkernel.txt | 58 --
drivers/staging/iio/Documentation/overview.txt | 57 --
drivers/staging/iio/Documentation/ring.txt | 47 --
14 files changed, 1452 insertions(+), 1452 deletions(-)
create mode 100644 Documentation/iio/device.txt
create mode 100644 Documentation/iio/generic_buffer.c
create mode 100644 Documentation/iio/iio_event_monitor.c
create mode 100644 Documentation/iio/iio_utils.h
create mode 100644 Documentation/iio/inkernel.txt
create mode 100644 Documentation/iio/overview.txt
create mode 100644 Documentation/iio/ring.txt
delete mode 100644 drivers/staging/iio/Documentation/device.txt
delete mode 100644 drivers/staging/iio/Documentation/generic_buffer.c
delete mode 100644 drivers/staging/iio/Documentation/iio_event_monitor.c
delete mode 100644 drivers/staging/iio/Documentation/iio_utils.h
delete mode 100644 drivers/staging/iio/Documentation/inkernel.txt
delete mode 100644 drivers/staging/iio/Documentation/overview.txt
delete mode 100644 drivers/staging/iio/Documentation/ring.txt
diff --git a/Documentation/iio/device.txt b/Documentation/iio/device.txt
new file mode 100644
index 0000000..0338c7c
--- /dev/null
+++ b/Documentation/iio/device.txt
@@ -0,0 +1,81 @@
+IIO Device drivers
+
+This is not intended to provide a comprehensive guide to writing an
+IIO device driver. For further information see the drivers within the
+subsystem.
+
+The crucial structure for device drivers in iio is iio_dev.
+
+First allocate one using:
+
+struct iio_dev *indio_dev = iio_device_alloc(sizeof(struct chip_state));
+where chip_state is a structure of local state data for this instance of
+the chip.
+
+That data can be accessed using iio_priv(struct iio_dev *)
+
+Then fill in the following:
+
+- indio_dev->dev.parent
+ Struct device associated with the underlying hardware.
+- indio_dev->name
+ Name of the device being driven - made available as the name
+ attribute in sysfs.
+
+- indio_dev->info
+ pointer to a structure with elements that tend to be fixed for
+ large sets of different parts supported by a given driver.
+ This contains:
+ * info->driver_module:
+ Set to THIS_MODULE. Used to ensure correct ownership
+ of various resources allocate by the core.
+ * info->num_interrupt_lines:
+ Number of event triggering hardware lines the device has.
+ * info->event_attrs:
+ Attributes used to enable / disable hardware events.
+ * info->attrs:
+ General device attributes. Typically used for the weird
+ and the wonderful bits not covered by the channel specification.
+ * info->read_raw:
+ Raw data reading function. Used for both raw channel access
+ and for associate parameters such as offsets and scales.
+ * info->write_raw:
+ Raw value writing function. Used for writable device values such
+ as DAC values and caliboffset.
+ * info->read_event_config:
+ Typically only set if there are some interrupt lines. This
+ is used to read if an on sensor event detector is enabled.
+ * info->write_event_config:
+ Enable / disable an on sensor event detector.
+ * info->read_event_value:
+ Read value associated with on sensor event detectors. Note that
+ the meaning of the returned value is dependent on the event
+ type.
+ * info->write_event_value:
+ Write the value associated with on sensor event detectors. E.g.
+ a threshold above which an interrupt occurs. Note that the
+ meaning of the value to be set is event type dependant.
+
+- indio_dev->modes:
+ Specify whether direct access and / or ring buffer access is supported.
+- indio_dev->ring:
+ An optional associated buffer.
+- indio_dev->pollfunc:
+ Poll function related elements. This controls what occurs when a trigger
+ to which this device is attached sends an event.
+- indio_dev->channels:
+ Specification of device channels. Most attributes etc are built
+ form this spec.
+- indio_dev->num_channels:
+ How many channels are there?
+
+Once these are set up, a call to iio_device_register(indio_dev),
+will register the device with the iio core.
+
+Worth noting here is that, if a ring buffer is to be used, it can be
+allocated prior to registering the device with the iio-core, but must
+be registered afterwards (otherwise the whole parentage of devices
+gets confused)
+
+On remove, iio_device_unregister(indio_dev) will remove the device from
+the core, and iio_device_free will clean up.
diff --git a/Documentation/iio/generic_buffer.c b/Documentation/iio/generic_buffer.c
new file mode 100644
index 0000000..bf55335
--- /dev/null
+++ b/Documentation/iio/generic_buffer.c
@@ -0,0 +1,329 @@
+/* Industrialio buffer test code.
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * 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 primarily intended as an example application.
+ * Reads the current buffer setup from sysfs and starts a short capture
+ * from the specified device, pretty printing the result after appropriate
+ * conversion.
+ *
+ * Command line parameters
+ * generic_buffer -n<device_name> -t<trigger_name>
+ * If trigger name is not specified the program assumes you want a dataready
+ * trigger associated with the device and goes looking for it.
+ *
+ */
+
+#include<unistd.h>
+#include<dirent.h>
+#include<fcntl.h>
+#include<stdio.h>
+#include<errno.h>
+#include<sys/stat.h>
+#include<sys/dir.h>
+#include<linux/types.h>
+#include<string.h>
+#include<poll.h>
+#include<endian.h>
+#include "iio_utils.h"
+
+/**
+ * size_from_channelarray() - calculate the storage size of a scan
+ * @channels: the channel info array
+ * @num_channels: size of the channel info array
+ *
+ * Has the side effect of filling the channels[i].location values used
+ * in processing the buffer output.
+ **/
+int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
+{
+ int bytes = 0;
+ int i = 0;
+ while (i< num_channels) {
+ if (bytes % channels[i].bytes == 0)
+ channels[i].location = bytes;
+ else
+ channels[i].location = bytes - bytes%channels[i].bytes
+ + channels[i].bytes;
+ bytes = channels[i].location + channels[i].bytes;
+ i++;
+ }
+ return bytes;
+}
+
+void print2byte(int input, struct iio_channel_info *info)
+{
+ /* First swap if incorrect endian */
+
+ if (info->be)
+ input = be16toh((uint16_t)input);
+ else
+ input = le16toh((uint16_t)input);
+
+ /* shift before conversion to avoid sign extension
+ of left aligned data */
+ input = input>> info->shift;
+ if (info->is_signed) {
+ int16_t val = input;
+ val&= (1<< info->bits_used) - 1;
+ val = (int16_t)(val<< (16 - info->bits_used))>>
+ (16 - info->bits_used);
+ printf("%05f ", val,
+ (float)(val + info->offset)*info->scale);
+ } else {
+ uint16_t val = input;
+ val&= (1<< info->bits_used) - 1;
+ printf("%05f ", ((float)val + info->offset)*info->scale);
+ }
+}
+/**
+ * process_scan() - print out the values in SI units
+ * @data: pointer to the start of the scan
+ * @infoarray: information about the channels. Note
+ * size_from_channelarray must have been called first to fill the
+ * location offsets.
+ * @num_channels: the number of active channels
+ **/
+void process_scan(char *data,
+ struct iio_channel_info *infoarray,
+ int num_channels)
+{
+ int k;
+ for (k = 0; k< num_channels; k++)
+ switch (infoarray[k].bytes) {
+ /* only a few cases implemented so far */
+ case 2:
+ print2byte(*(uint16_t *)(data + infoarray[k].location),
+ &infoarray[k]);
+ break;
+ case 8:
+ if (infoarray[k].is_signed) {
+ int64_t val = *(int64_t *)
+ (data +
+ infoarray[k].location);
+ if ((val>> infoarray[k].bits_used)& 1)
+ val = (val& infoarray[k].mask) |
+ ~infoarray[k].mask;
+ /* special case for timestamp */
+ if (infoarray[k].scale == 1.0f&&
+ infoarray[k].offset == 0.0f)
+ printf(" %lld", val);
+ else
+ printf("%05f ", ((float)val +
+ infoarray[k].offset)*
+ infoarray[k].scale);
+ }
+ break;
+ default:
+ break;
+ }
+ printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+ unsigned long num_loops = 2;
+ unsigned long timedelay = 1000000;
+ unsigned long buf_len = 128;
+
+
+ int ret, c, i, j, toread;
+
+ FILE *fp_ev;
+ int fp;
+
+ int num_channels;
+ char *trigger_name = NULL, *device_name = NULL;
+ char *dev_dir_name, *buf_dir_name;
+
+ int datardytrigger = 1;
+ char *data;
+ ssize_t read_size;
+ int dev_num, trig_num;
+ char *buffer_access;
+ int scan_size;
+ int noevents = 0;
+ char *dummy;
+
+ struct iio_channel_info *infoarray;
+
+ while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) {
+ switch (c) {
+ case 'n':
+ device_name = optarg;
+ break;
+ case 't':
+ trigger_name = optarg;
+ datardytrigger = 0;
+ break;
+ case 'e':
+ noevents = 1;
+ break;
+ case 'c':
+ num_loops = strtoul(optarg,&dummy, 10);
+ break;
+ case 'w':
+ timedelay = strtoul(optarg,&dummy, 10);
+ break;
+ case 'l':
+ buf_len = strtoul(optarg,&dummy, 10);
+ break;
+ case '?':
+ return -1;
+ }
+ }
+
+ if (device_name == NULL)
+ return -1;
+
+ /* Find the device requested */
+ dev_num = find_type_by_name(device_name, "iio:device");
+ if (dev_num< 0) {
+ printf("Failed to find the %s\n", device_name);
+ ret = -ENODEV;
+ goto error_ret;
+ }
+ printf("iio device number being used is %d\n", dev_num);
+
+ asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
+ if (trigger_name == NULL) {
+ /*
+ * Build the trigger name. If it is device associated it's
+ * name is<device_name>_dev[n] where n matches the device
+ * number found above
+ */
+ ret = asprintf(&trigger_name,
+ "%s-dev%d", device_name, dev_num);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ }
+
+ /* Verify the trigger exists */
+ trig_num = find_type_by_name(trigger_name, "trigger");
+ if (trig_num< 0) {
+ printf("Failed to find the trigger %s\n", trigger_name);
+ ret = -ENODEV;
+ goto error_free_triggername;
+ }
+ printf("iio trigger number being used is %d\n", trig_num);
+
+ /*
+ * Parse the files in scan_elements to identify what channels are
+ * present
+ */
+ ret = build_channel_array(dev_dir_name,&infoarray,&num_channels);
+ if (ret) {
+ printf("Problem reading scan element information\n");
+ printf("diag %s\n", dev_dir_name);
+ goto error_free_triggername;
+ }
+
+ /*
+ * Construct the directory name for the associated buffer.
+ * As we know that the lis3l02dq has only one buffer this may
+ * be built rather than found.
+ */
+ ret = asprintf(&buf_dir_name,
+ "%siio:device%d/buffer", iio_dir, dev_num);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_free_triggername;
+ }
+ printf("%s %s\n", dev_dir_name, trigger_name);
+ /* Set the device trigger to be the data rdy trigger found above */
+ ret = write_sysfs_string_and_verify("trigger/current_trigger",
+ dev_dir_name,
+ trigger_name);
+ if (ret< 0) {
+ printf("Failed to write current_trigger file\n");
+ goto error_free_buf_dir_name;
+ }
+
+ /* Setup ring buffer parameters */
+ ret = write_sysfs_int("length", buf_dir_name, buf_len);
+ if (ret< 0)
+ goto error_free_buf_dir_name;
+
+ /* Enable the buffer */
+ ret = write_sysfs_int("enable", buf_dir_name, 1);
+ if (ret< 0)
+ goto error_free_buf_dir_name;
+ scan_size = size_from_channelarray(infoarray, num_channels);
+ data = malloc(scan_size*buf_len);
+ if (!data) {
+ ret = -ENOMEM;
+ goto error_free_buf_dir_name;
+ }
+
+ ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_free_data;
+ }
+
+ /* Attempt to open non blocking the access dev */
+ fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
+ if (fp == -1) { /*If it isn't there make the node */
+ printf("Failed to open %s\n", buffer_access);
+ ret = -errno;
+ goto error_free_buffer_access;
+ }
+
+ /* Wait for events 10 times */
+ for (j = 0; j< num_loops; j++) {
+ if (!noevents) {
+ struct pollfd pfd = {
+ .fd = fp,
+ .events = POLLIN,
+ };
+
+ poll(&pfd, 1, -1);
+ toread = buf_len;
+
+ } else {
+ usleep(timedelay);
+ toread = 64;
+ }
+
+ read_size = read(fp,
+ data,
+ toread*scan_size);
+ if (read_size == -EAGAIN) {
+ printf("nothing available\n");
+ continue;
+ }
+ for (i = 0; i< read_size/scan_size; i++)
+ process_scan(data + scan_size*i,
+ infoarray,
+ num_channels);
+ }
+
+ /* Stop the ring buffer */
+ ret = write_sysfs_int("enable", buf_dir_name, 0);
+ if (ret< 0)
+ goto error_close_buffer_access;
+
+ /* Disconnect from the trigger - just write a dummy name.*/
+ write_sysfs_string("trigger/current_trigger",
+ dev_dir_name, "NULL");
+
+error_close_buffer_access:
+ close(fp);
+error_free_data:
+ free(data);
+error_free_buffer_access:
+ free(buffer_access);
+error_free_buf_dir_name:
+ free(buf_dir_name);
+error_free_triggername:
+ if (datardytrigger)
+ free(trigger_name);
+error_ret:
+ return ret;
+}
diff --git a/Documentation/iio/iio_event_monitor.c b/Documentation/iio/iio_event_monitor.c
new file mode 100644
index 0000000..2227584
--- /dev/null
+++ b/Documentation/iio/iio_event_monitor.c
@@ -0,0 +1,241 @@
+/* Industrialio event test code.
+ *
+ * Copyright (c) 2011-2012 Lars-Peter Clausen<lars@xxxxxxxxxx>
+ *
+ * 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 primarily intended as an example application.
+ * Reads the current buffer setup from sysfs and starts a short capture
+ * from the specified device, pretty printing the result after appropriate
+ * conversion.
+ *
+ * Usage:
+ * iio_event_monitor<device_name>
+ *
+ */
+
+#define _GNU_SOURCE
+
+#include<unistd.h>
+#include<stdbool.h>
+#include<stdio.h>
+#include<errno.h>
+#include<string.h>
+#include<poll.h>
+#include<fcntl.h>
+#include<sys/ioctl.h>
+#include "iio_utils.h"
+#include<linux/iio/events.h>
+
+static const char * const iio_chan_type_name_spec[] = {
+ [IIO_VOLTAGE] = "voltage",
+ [IIO_CURRENT] = "current",
+ [IIO_POWER] = "power",
+ [IIO_ACCEL] = "accel",
+ [IIO_ANGL_VEL] = "anglvel",
+ [IIO_MAGN] = "magn",
+ [IIO_LIGHT] = "illuminance",
+ [IIO_INTENSITY] = "intensity",
+ [IIO_PROXIMITY] = "proximity",
+ [IIO_TEMP] = "temp",
+ [IIO_INCLI] = "incli",
+ [IIO_ROT] = "rot",
+ [IIO_ANGL] = "angl",
+ [IIO_TIMESTAMP] = "timestamp",
+ [IIO_CAPACITANCE] = "capacitance",
+};
+
+static const char * const iio_ev_type_text[] = {
+ [IIO_EV_TYPE_THRESH] = "thresh",
+ [IIO_EV_TYPE_MAG] = "mag",
+ [IIO_EV_TYPE_ROC] = "roc",
+ [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
+ [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
+};
+
+static const char * const iio_ev_dir_text[] = {
+ [IIO_EV_DIR_EITHER] = "either",
+ [IIO_EV_DIR_RISING] = "rising",
+ [IIO_EV_DIR_FALLING] = "falling"
+};
+
+static const char * const iio_modifier_names[] = {
+ [IIO_MOD_X] = "x",
+ [IIO_MOD_Y] = "y",
+ [IIO_MOD_Z] = "z",
+ [IIO_MOD_LIGHT_BOTH] = "both",
+ [IIO_MOD_LIGHT_IR] = "ir",
+};
+
+static bool event_is_known(struct iio_event_data *event)
+{
+ enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
+ enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
+ enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
+ enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
+
+ switch (type) {
+ case IIO_VOLTAGE:
+ case IIO_CURRENT:
+ case IIO_POWER:
+ case IIO_ACCEL:
+ case IIO_ANGL_VEL:
+ case IIO_MAGN:
+ case IIO_LIGHT:
+ case IIO_INTENSITY:
+ case IIO_PROXIMITY:
+ case IIO_TEMP:
+ case IIO_INCLI:
+ case IIO_ROT:
+ case IIO_ANGL:
+ case IIO_TIMESTAMP:
+ case IIO_CAPACITANCE:
+ break;
+ default:
+ return false;
+ }
+
+ switch (mod) {
+ case IIO_NO_MOD:
+ case IIO_MOD_X:
+ case IIO_MOD_Y:
+ case IIO_MOD_Z:
+ case IIO_MOD_LIGHT_BOTH:
+ case IIO_MOD_LIGHT_IR:
+ break;
+ default:
+ return false;
+ }
+
+ switch (ev_type) {
+ case IIO_EV_TYPE_THRESH:
+ case IIO_EV_TYPE_MAG:
+ case IIO_EV_TYPE_ROC:
+ case IIO_EV_TYPE_THRESH_ADAPTIVE:
+ case IIO_EV_TYPE_MAG_ADAPTIVE:
+ break;
+ default:
+ return false;
+ }
+
+ switch (dir) {
+ case IIO_EV_DIR_EITHER:
+ case IIO_EV_DIR_RISING:
+ case IIO_EV_DIR_FALLING:
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static void print_event(struct iio_event_data *event)
+{
+ enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
+ enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
+ enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
+ enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
+ int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
+ int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
+ bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
+
+ if (!event_is_known(event)) {
+ printf("Unknown event: time: %lld, id: %llx\n",
+ event->timestamp, event->id);
+ return;
+ }
+
+ printf("Event: time: %lld, ", event->timestamp);
+
+ if (mod != IIO_NO_MOD) {
+ printf("type: %s(%s), ",
+ iio_chan_type_name_spec[type],
+ iio_modifier_names[mod]);
+ } else {
+ printf("type: %s, ",
+ iio_chan_type_name_spec[type]);
+ }
+
+ if (diff&& chan>= 0&& chan2>= 0)
+ printf("channel: %d-%d, ", chan, chan2);
+ else if (chan>= 0)
+ printf("channel: %d, ", chan);
+
+ printf("evtype: %s, direction: %s\n",
+ iio_ev_type_text[ev_type],
+ iio_ev_dir_text[dir]);
+}
+
+int main(int argc, char **argv)
+{
+ struct iio_event_data event;
+ const char *device_name;
+ char *chrdev_name;
+ int ret;
+ int dev_num;
+ int fd, event_fd;
+
+ if (argc<= 1) {
+ printf("Usage: %s<device_name>\n", argv[0]);
+ return -1;
+ }
+
+ device_name = argv[1];
+
+ dev_num = find_type_by_name(device_name, "iio:device");
+ if (dev_num>= 0) {
+ printf("Found IIO device with name %s with device number %d\n",
+ device_name, dev_num);
+ ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ } else {
+ /* If we can't find a IIO device by name assume device_name is a
+ IIO chrdev */
+ chrdev_name = strdup(device_name);
+ }
+
+ fd = open(chrdev_name, 0);
+ if (fd == -1) {
+ fprintf(stdout, "Failed to open %s\n", chrdev_name);
+ ret = -errno;
+ goto error_free_chrdev_name;
+ }
+
+ ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL,&event_fd);
+
+ close(fd);
+
+ if (ret == -1 || event_fd == -1) {
+ fprintf(stdout, "Failed to retrieve event fd\n");
+ ret = -errno;
+ goto error_free_chrdev_name;
+ }
+
+ while (true) {
+ ret = read(event_fd,&event, sizeof(event));
+ if (ret == -1) {
+ if (errno == EAGAIN) {
+ printf("nothing available\n");
+ continue;
+ } else {
+ perror("Failed to read event from device");
+ ret = -errno;
+ break;
+ }
+ }
+
+ print_event(&event);
+ }
+
+ close(event_fd);
+error_free_chrdev_name:
+ free(chrdev_name);
+error_ret:
+ return ret;
+}
diff --git a/Documentation/iio/iio_utils.h b/Documentation/iio/iio_utils.h
new file mode 100644
index 0000000..6f3a392
--- /dev/null
+++ b/Documentation/iio/iio_utils.h
@@ -0,0 +1,639 @@
+/* IIO - useful set of util functionality
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * 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.
+ */
+
+/* Made up value to limit allocation sizes */
+#include<string.h>
+#include<stdlib.h>
+#include<ctype.h>
+#include<stdio.h>
+#include<stdint.h>
+#include<dirent.h>
+
+#define IIO_MAX_NAME_LENGTH 30
+
+#define FORMAT_SCAN_ELEMENTS_DIR "%s/scan_elements"
+#define FORMAT_TYPE_FILE "%s_type"
+
+const char *iio_dir = "/sys/bus/iio/devices/";
+
+/**
+ * iioutils_break_up_name() - extract generic name from full channel name
+ * @full_name: the full channel name
+ * @generic_name: the output generic channel name
+ **/
+static int iioutils_break_up_name(const char *full_name,
+ char **generic_name)
+{
+ char *current;
+ char *w, *r;
+ char *working;
+ current = strdup(full_name);
+ working = strtok(current, "_\0");
+ w = working;
+ r = working;
+
+ while (*r != '\0') {
+ if (!isdigit(*r)) {
+ *w = *r;
+ w++;
+ }
+ r++;
+ }
+ *w = '\0';
+ *generic_name = strdup(working);
+ free(current);
+
+ return 0;
+}
+
+/**
+ * struct iio_channel_info - information about a given channel
+ * @name: channel name
+ * @generic_name: general name for channel type
+ * @scale: scale factor to be applied for conversion to si units
+ * @offset: offset to be applied for conversion to si units
+ * @index: the channel index in the buffer output
+ * @bytes: number of bytes occupied in buffer output
+ * @mask: a bit mask for the raw output
+ * @is_signed: is the raw value stored signed
+ * @enabled: is this channel enabled
+ **/
+struct iio_channel_info {
+ char *name;
+ char *generic_name;
+ float scale;
+ float offset;
+ unsigned index;
+ unsigned bytes;
+ unsigned bits_used;
+ unsigned shift;
+ uint64_t mask;
+ unsigned be;
+ unsigned is_signed;
+ unsigned enabled;
+ unsigned location;
+};
+
+/**
+ * iioutils_get_type() - find and process _type attribute data
+ * @is_signed: output whether channel is signed
+ * @bytes: output how many bytes the channel storage occupies
+ * @mask: output a bit mask for the raw data
+ * @be: big endian
+ * @device_dir: the iio device directory
+ * @name: the channel name
+ * @generic_name: the channel type name
+ **/
+inline int iioutils_get_type(unsigned *is_signed,
+ unsigned *bytes,
+ unsigned *bits_used,
+ unsigned *shift,
+ uint64_t *mask,
+ unsigned *be,
+ const char *device_dir,
+ const char *name,
+ const char *generic_name)
+{
+ FILE *sysfsfp;
+ int ret;
+ DIR *dp;
+ char *scan_el_dir, *builtname, *builtname_generic, *filename = 0;
+ char signchar, endianchar;
+ unsigned padint;
+ const struct dirent *ent;
+
+ ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = asprintf(&builtname, FORMAT_TYPE_FILE, name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_free_scan_el_dir;
+ }
+ ret = asprintf(&builtname_generic, FORMAT_TYPE_FILE, generic_name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_free_builtname;
+ }
+
+ dp = opendir(scan_el_dir);
+ if (dp == NULL) {
+ ret = -errno;
+ goto error_free_builtname_generic;
+ }
+ while (ent = readdir(dp), ent != NULL)
+ /*
+ * Do we allow devices to override a generic name with
+ * a specific one?
+ */
+ if ((strcmp(builtname, ent->d_name) == 0) ||
+ (strcmp(builtname_generic, ent->d_name) == 0)) {
+ ret = asprintf(&filename,
+ "%s/%s", scan_el_dir, ent->d_name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_closedir;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (sysfsfp == NULL) {
+ printf("failed to open %s\n", filename);
+ ret = -errno;
+ goto error_free_filename;
+ }
+
+ ret = fscanf(sysfsfp,
+ "%ce:%c%u/%u>>%u",
+ &endianchar,
+ &signchar,
+ bits_used,
+ &padint, shift);
+ if (ret< 0) {
+ printf("failed to pass scan type description\n");
+ return ret;
+ }
+ *be = (endianchar == 'b');
+ *bytes = padint / 8;
+ if (*bits_used == 64)
+ *mask = ~0;
+ else
+ *mask = (1<< *bits_used) - 1;
+ if (signchar == 's')
+ *is_signed = 1;
+ else
+ *is_signed = 0;
+ fclose(sysfsfp);
+ free(filename);
+
+ filename = 0;
+ }
+error_free_filename:
+ if (filename)
+ free(filename);
+error_closedir:
+ closedir(dp);
+error_free_builtname_generic:
+ free(builtname_generic);
+error_free_builtname:
+ free(builtname);
+error_free_scan_el_dir:
+ free(scan_el_dir);
+error_ret:
+ return ret;
+}
+
+inline int iioutils_get_param_float(float *output,
+ const char *param_name,
+ const char *device_dir,
+ const char *name,
+ const char *generic_name)
+{
+ FILE *sysfsfp;
+ int ret;
+ DIR *dp;
+ char *builtname, *builtname_generic;
+ char *filename = NULL;
+ const struct dirent *ent;
+
+ ret = asprintf(&builtname, "%s_%s", name, param_name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = asprintf(&builtname_generic,
+ "%s_%s", generic_name, param_name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_free_builtname;
+ }
+ dp = opendir(device_dir);
+ if (dp == NULL) {
+ ret = -errno;
+ goto error_free_builtname_generic;
+ }
+ while (ent = readdir(dp), ent != NULL)
+ if ((strcmp(builtname, ent->d_name) == 0) ||
+ (strcmp(builtname_generic, ent->d_name) == 0)) {
+ ret = asprintf(&filename,
+ "%s/%s", device_dir, ent->d_name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_closedir;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (!sysfsfp) {
+ ret = -errno;
+ goto error_free_filename;
+ }
+ fscanf(sysfsfp, "%f", output);
+ break;
+ }
+error_free_filename:
+ if (filename)
+ free(filename);
+error_closedir:
+ closedir(dp);
+error_free_builtname_generic:
+ free(builtname_generic);
+error_free_builtname:
+ free(builtname);
+error_ret:
+ return ret;
+}
+
+/**
+ * bsort_channel_array_by_index() - reorder so that the array is in index order
+ *
+ **/
+
+inline void bsort_channel_array_by_index(struct iio_channel_info **ci_array,
+ int cnt)
+{
+
+ struct iio_channel_info temp;
+ int x, y;
+
+ for (x = 0; x< cnt; x++)
+ for (y = 0; y< (cnt - 1); y++)
+ if ((*ci_array)[y].index> (*ci_array)[y+1].index) {
+ temp = (*ci_array)[y + 1];
+ (*ci_array)[y + 1] = (*ci_array)[y];
+ (*ci_array)[y] = temp;
+ }
+}
+
+/**
+ * build_channel_array() - function to figure out what channels are present
+ * @device_dir: the IIO device directory in sysfs
+ * @
+ **/
+inline int build_channel_array(const char *device_dir,
+ struct iio_channel_info **ci_array,
+ int *counter)
+{
+ DIR *dp;
+ FILE *sysfsfp;
+ int count, temp, i;
+ struct iio_channel_info *current;
+ int ret;
+ const struct dirent *ent;
+ char *scan_el_dir;
+ char *filename;
+
+ *counter = 0;
+ ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ dp = opendir(scan_el_dir);
+ if (dp == NULL) {
+ ret = -errno;
+ goto error_free_name;
+ }
+ while (ent = readdir(dp), ent != NULL)
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
+ "_en") == 0) {
+ ret = asprintf(&filename,
+ "%s/%s", scan_el_dir, ent->d_name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ goto error_close_dir;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (sysfsfp == NULL) {
+ ret = -errno;
+ free(filename);
+ goto error_close_dir;
+ }
+ fscanf(sysfsfp, "%u",&ret);
+ if (ret == 1)
+ (*counter)++;
+ fclose(sysfsfp);
+ free(filename);
+ }
+ *ci_array = malloc(sizeof(**ci_array) * (*counter));
+ if (*ci_array == NULL) {
+ ret = -ENOMEM;
+ goto error_close_dir;
+ }
+ seekdir(dp, 0);
+ count = 0;
+ while (ent = readdir(dp), ent != NULL) {
+ if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
+ "_en") == 0) {
+ current =&(*ci_array)[count++];
+ ret = asprintf(&filename,
+ "%s/%s", scan_el_dir, ent->d_name);
+ if (ret< 0) {
+ ret = -ENOMEM;
+ /* decrement count to avoid freeing name */
+ count--;
+ goto error_cleanup_array;
+ }
+ sysfsfp = fopen(filename, "r");
+ if (sysfsfp == NULL) {
+ free(filename);
+ ret = -errno;
+ goto error_cleanup_array;
+ }
+ fscanf(sysfsfp, "%u",¤t->enabled);
+ fclose(sysfsfp);
+
+ if (!current->enabled) {
+ free(filename);
+ count--;
+ continue;
+ }
+
+ current->scale = 1.0;
+ current->offset = 0;
+ current->name = strndup(ent->d_name,
+ strlen(ent->d_name) -
+ strlen("_en"));
+ if (current->name == NULL) {
+ free(filename);
+ ret = -ENOMEM;
+ goto error_cleanup_array;
+ }
+ /* Get the generic and specific name elements */
+ ret = iioutils_break_up_name(current->name,
+ ¤t->generic_name);
+ if (ret) {
+ free(filename);
+ goto error_cleanup_array;
+ }
+ ret = asprintf(&filename,
+ "%s/%s_index",
+ scan_el_dir,
+ current->name);
+ if (ret< 0) {
+ free(filename);
+ ret = -ENOMEM;
+ goto error_cleanup_array;
+ }
+ sysfsfp = fopen(filename, "r");
+ fscanf(sysfsfp, "%u",¤t->index);
+ fclose(sysfsfp);
+ free(filename);
+ /* Find the scale */
+ ret = iioutils_get_param_float(¤t->scale,
+ "scale",
+ device_dir,
+ current->name,
+ current->generic_name);
+ if (ret< 0)
+ goto error_cleanup_array;
+ ret = iioutils_get_param_float(¤t->offset,
+ "offset",
+ device_dir,
+ current->name,
+ current->generic_name);
+ if (ret< 0)
+ goto error_cleanup_array;
+ ret = iioutils_get_type(¤t->is_signed,
+ ¤t->bytes,
+ ¤t->bits_used,
+ ¤t->shift,
+ ¤t->mask,
+ ¤t->be,
+ device_dir,
+ current->name,
+ current->generic_name);
+ }
+ }
+
+ closedir(dp);
+ /* reorder so that the array is in index order */
+ bsort_channel_array_by_index(ci_array, *counter);
+
+ return 0;
+
+error_cleanup_array:
+ for (i = count - 1; i>= 0; i--)
+ free((*ci_array)[i].name);
+ free(*ci_array);
+error_close_dir:
+ closedir(dp);
+error_free_name:
+ free(scan_el_dir);
+error_ret:
+ return ret;
+}
+
+/**
+ * find_type_by_name() - function to match top level types by name
+ * @name: top level type instance name
+ * @type: the type of top level instance being sort
+ *
+ * Typical types this is used for are device and trigger.
+ **/
+inline int find_type_by_name(const char *name, const char *type)
+{
+ const struct dirent *ent;
+ int number, numstrlen;
+
+ FILE *nameFile;
+ DIR *dp;
+ char thisname[IIO_MAX_NAME_LENGTH];
+ char *filename;
+
+ dp = opendir(iio_dir);
+ if (dp == NULL) {
+ printf("No industrialio devices available");
+ return -ENODEV;
+ }
+
+ while (ent = readdir(dp), ent != NULL) {
+ if (strcmp(ent->d_name, ".") != 0&&
+ strcmp(ent->d_name, "..") != 0&&
+ strlen(ent->d_name)> strlen(type)&&
+ strncmp(ent->d_name, type, strlen(type)) == 0) {
+ numstrlen = sscanf(ent->d_name + strlen(type),
+ "%d",
+ &number);
+ /* verify the next character is not a colon */
+ if (strncmp(ent->d_name + strlen(type) + numstrlen,
+ ":",
+ 1) != 0) {
+ filename = malloc(strlen(iio_dir)
+ + strlen(type)
+ + numstrlen
+ + 6);
+ if (filename == NULL)
+ return -ENOMEM;
+ sprintf(filename, "%s%s%d/name",
+ iio_dir,
+ type,
+ number);
+ nameFile = fopen(filename, "r");
+ if (!nameFile)
+ continue;
+ free(filename);
+ fscanf(nameFile, "%s", thisname);
+ if (strcmp(name, thisname) == 0)
+ return number;
+ fclose(nameFile);
+ }
+ }
+ }
+ return -ENODEV;
+}
+
+inline int _write_sysfs_int(char *filename, char *basedir, int val, int verify)
+{
+ int ret;
+ FILE *sysfsfp;
+ int test;
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL)
+ return -ENOMEM;
+ sprintf(temp, "%s/%s", basedir, filename);
+ sysfsfp = fopen(temp, "w");
+ if (sysfsfp == NULL) {
+ printf("failed to open %s\n", temp);
+ ret = -errno;
+ goto error_free;
+ }
+ fprintf(sysfsfp, "%d", val);
+ fclose(sysfsfp);
+ if (verify) {
+ sysfsfp = fopen(temp, "r");
+ if (sysfsfp == NULL) {
+ printf("failed to open %s\n", temp);
+ ret = -errno;
+ goto error_free;
+ }
+ fscanf(sysfsfp, "%d",&test);
+ if (test != val) {
+ printf("Possible failure in int write %d to %s%s\n",
+ val,
+ basedir,
+ filename);
+ ret = -1;
+ }
+ }
+error_free:
+ free(temp);
+ return ret;
+}
+
+int write_sysfs_int(char *filename, char *basedir, int val)
+{
+ return _write_sysfs_int(filename, basedir, val, 0);
+}
+
+int write_sysfs_int_and_verify(char *filename, char *basedir, int val)
+{
+ return _write_sysfs_int(filename, basedir, val, 1);
+}
+
+int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
+{
+ int ret = 0;
+ FILE *sysfsfp;
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL) {
+ printf("Memory allocation failed\n");
+ return -ENOMEM;
+ }
+ sprintf(temp, "%s/%s", basedir, filename);
+ sysfsfp = fopen(temp, "w");
+ if (sysfsfp == NULL) {
+ printf("Could not open %s\n", temp);
+ ret = -errno;
+ goto error_free;
+ }
+ fprintf(sysfsfp, "%s", val);
+ fclose(sysfsfp);
+ if (verify) {
+ sysfsfp = fopen(temp, "r");
+ if (sysfsfp == NULL) {
+ printf("could not open file to verify\n");
+ ret = -errno;
+ goto error_free;
+ }
+ fscanf(sysfsfp, "%s", temp);
+ if (strcmp(temp, val) != 0) {
+ printf("Possible failure in string write of %s "
+ "Should be %s "
+ "written to %s\%s\n",
+ temp,
+ val,
+ basedir,
+ filename);
+ ret = -1;
+ }
+ }
+error_free:
+ free(temp);
+
+ return ret;
+}
+
+/**
+ * write_sysfs_string_and_verify() - string write, readback and verify
+ * @filename: name of file to write to
+ * @basedir: the sysfs directory in which the file is to be found
+ * @val: the string to write
+ **/
+int write_sysfs_string_and_verify(char *filename, char *basedir, char *val)
+{
+ return _write_sysfs_string(filename, basedir, val, 1);
+}
+
+int write_sysfs_string(char *filename, char *basedir, char *val)
+{
+ return _write_sysfs_string(filename, basedir, val, 0);
+}
+
+int read_sysfs_posint(char *filename, char *basedir)
+{
+ int ret;
+ FILE *sysfsfp;
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL) {
+ printf("Memory allocation failed");
+ return -ENOMEM;
+ }
+ sprintf(temp, "%s/%s", basedir, filename);
+ sysfsfp = fopen(temp, "r");
+ if (sysfsfp == NULL) {
+ ret = -errno;
+ goto error_free;
+ }
+ fscanf(sysfsfp, "%d\n",&ret);
+ fclose(sysfsfp);
+error_free:
+ free(temp);
+ return ret;
+}
+
+int read_sysfs_float(char *filename, char *basedir, float *val)
+{
+ float ret = 0;
+ FILE *sysfsfp;
+ char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
+ if (temp == NULL) {
+ printf("Memory allocation failed");
+ return -ENOMEM;
+ }
+ sprintf(temp, "%s/%s", basedir, filename);
+ sysfsfp = fopen(temp, "r");
+ if (sysfsfp == NULL) {
+ ret = -errno;
+ goto error_free;
+ }
+ fscanf(sysfsfp, "%f\n", val);
+ fclose(sysfsfp);
+error_free:
+ free(temp);
+ return ret;
+}
diff --git a/Documentation/iio/inkernel.txt b/Documentation/iio/inkernel.txt
new file mode 100644
index 0000000..a05823e
--- /dev/null
+++ b/Documentation/iio/inkernel.txt
@@ -0,0 +1,58 @@
+Industrial I/O Subsystem in kernel consumers.
+
+The IIO subsystem can act as a layer under other elements of the kernel
+providing a means of obtaining ADC type readings or of driving DAC type
+signals. The functionality supported will grow as use cases arise.
+
+Describing the channel mapping (iio/machine.h)
+
+Channel associations are described using:
+
+struct iio_map {
+ const char *adc_channel_label;
+ const char *consumer_dev_name;
+ const char *consumer_channel;
+};
+
+adc_channel_label identifies the channel on the IIO device by being
+matched against the datasheet_name field of the iio_chan_spec.
+
+consumer_dev_name allows identification of the consumer device.
+This are then used to find the channel mapping from the consumer device (see
+below).
+
+Finally consumer_channel is a string identifying the channel to the consumer.
+(Perhaps 'battery_voltage' or similar).
+
+An array of these structures is then passed to the IIO driver.
+
+Supporting in kernel interfaces in the driver (driver.h)
+
+The driver must provide datasheet_name values for its channels and
+must pass the iio_map structures and a pointer to its own iio_dev structure
+ on to the core via a call to iio_map_array_register. On removal,
+iio_map_array_unregister reverses this process.
+
+The result of this is that the IIO core now has all the information needed
+to associate a given channel with the consumer requesting it.
+
+Acting as an IIO consumer (consumer.h)
+
+The consumer first has to obtain an iio_channel structure from the core
+by calling iio_channel_get(). The correct channel is identified by:
+
+* matching dev or dev_name against consumer_dev and consumer_dev_name
+* matching consumer_channel against consumer_channel in the map
+
+There are then a number of functions that can be used to get information
+about this channel such as it's current reading.
+
+e.g.
+iio_st_read_channel_raw() - get a reading
+iio_st_read_channel_type() - get the type of channel
+
+There is also provision for retrieving all of the channels associated
+with a given consumer. This is useful for generic drivers such as
+iio_hwmon where the number and naming of channels is not known by the
+consumer driver. To do this, use iio_st_channel_get_all.
+
diff --git a/Documentation/iio/overview.txt b/Documentation/iio/overview.txt
new file mode 100644
index 0000000..afc39ec
--- /dev/null
+++ b/Documentation/iio/overview.txt
@@ -0,0 +1,57 @@
+Overview of IIO
+
+The Industrial I/O subsystem is intended to provide support for devices
+that in some sense are analog to digital converters (ADCs). As many
+actual devices combine some ADCs with digital to analog converters
+(DACs) that functionality is also supported.
+
+The aim is to fill the gap between the somewhat similar hwmon and
+input subsystems. Hwmon is very much directed at low sample rate
+sensors used in applications such as fan speed control and temperature
+measurement. Input is, as it's name suggests focused on input
+devices. In some cases there is considerable overlap between these and
+IIO.
+
+A typical device falling into this category would be connected via SPI
+or I2C.
+
+Functionality of IIO
+
+* Basic device registration and handling. This is very similar to
+hwmon with simple polled access to device channels via sysfs.
+
+* Event chrdevs. These are similar to input in that they provide a
+route to user space for hardware triggered events. Such events include
+threshold detectors, free-fall detectors and more complex action
+detection. The events themselves are currently very simple with
+merely an event code and a timestamp. Any data associated with the
+event must be accessed via polling.
+
+Note: A given device may have one or more event channel. These events are
+turned on or off (if possible) via sysfs interfaces.
+
+* Hardware buffer support. Some recent sensors have included
+fifo / ring buffers on the sensor chip. These greatly reduce the load
+on the host CPU by buffering relatively large numbers of data samples
+based on an internal sampling clock. Examples include VTI SCA3000
+series and Analog Device ADXL345 accelerometers. Each buffer supports
+polling to establish when data is available.
+
+* Trigger and software buffer support. In many data analysis
+applications it it useful to be able to capture data based on some
+external signal (trigger). These triggers might be a data ready
+signal, a gpio line connected to some external system or an on
+processor periodic interrupt. A single trigger may initialize data
+capture or reading from a number of sensors. These triggers are
+used in IIO to fill software buffers acting in a very similar
+fashion to the hardware buffers described above.
+
+Other documentation:
+
+device.txt - elements of a typical device driver.
+
+trigger.txt - elements of a typical trigger driver.
+
+ring.txt - additional elements required for buffer support.
+
+sysfs-bus-iio - abi documentation file.
diff --git a/Documentation/iio/ring.txt b/Documentation/iio/ring.txt
new file mode 100644
index 0000000..e338077
--- /dev/null
+++ b/Documentation/iio/ring.txt
@@ -0,0 +1,47 @@
+Buffer support within IIO
+
+This document is intended as a general overview of the functionality
+a buffer may supply and how it is specified within IIO. For more
+specific information on a given buffer implementation, see the
+comments in the source code. Note that some drivers allow buffer
+implementation to be selected at compile time via Kconfig options.
+
+A given buffer implementation typically embeds a struct
+iio_ring_buffer and it is a pointer to this that is provided to the
+IIO core. Access to the embedding structure is typically done via
+container_of functions.
+
+struct iio_ring_buffer contains a struct iio_ring_setup_ops *setup_ops
+which in turn contains the 4 function pointers
+(preenable, postenable, predisable and postdisable).
+These are used to perform device specific steps on either side
+of the core changing it's current mode to indicate that the buffer
+is enabled or disabled (along with enabling triggering etc as appropriate).
+
+Also in struct iio_ring_buffer is a struct iio_ring_access_funcs.
+The function pointers within here are used to allow the core to handle
+as much buffer functionality as possible. Note almost all of these
+are optional.
+
+store_to
+ If possible, push data to the buffer.
+
+read_last
+ If possible, get the most recent scan from the buffer (without removal).
+ This provides polling like functionality whilst the ring buffering is in
+ use without a separate read from the device.
+
+rip_first_n
+ The primary buffer reading function. Note that it may well not return
+ as much data as requested.
+
+request_update
+ If parameters have changed that require reinitialization or configuration of
+ the buffer this will trigger it.
+
+get_bytes_per_datum, set_bytes_per_datum
+ Get/set the number of bytes for a complete scan. (All samples + timestamp)
+
+get_length / set_length
+ Get/set the number of complete scans that may be held by the buffer.
+
diff --git a/drivers/staging/iio/Documentation/device.txt b/drivers/staging/iio/Documentation/device.txt
deleted file mode 100644
index 0338c7c..0000000
--- a/drivers/staging/iio/Documentation/device.txt
+++ /dev/null
@@ -1,81 +0,0 @@
-IIO Device drivers
-
-This is not intended to provide a comprehensive guide to writing an
-IIO device driver. For further information see the drivers within the
-subsystem.
-
-The crucial structure for device drivers in iio is iio_dev.
-
-First allocate one using:
-
-struct iio_dev *indio_dev = iio_device_alloc(sizeof(struct chip_state));
-where chip_state is a structure of local state data for this instance of
-the chip.
-
-That data can be accessed using iio_priv(struct iio_dev *)
-
-Then fill in the following:
-
-- indio_dev->dev.parent
- Struct device associated with the underlying hardware.
-- indio_dev->name
- Name of the device being driven - made available as the name
- attribute in sysfs.
-
-- indio_dev->info
- pointer to a structure with elements that tend to be fixed for
- large sets of different parts supported by a given driver.
- This contains:
- * info->driver_module:
- Set to THIS_MODULE. Used to ensure correct ownership
- of various resources allocate by the core.
- * info->num_interrupt_lines:
- Number of event triggering hardware lines the device has.
- * info->event_attrs:
- Attributes used to enable / disable hardware events.
- * info->attrs:
- General device attributes. Typically used for the weird
- and the wonderful bits not covered by the channel specification.
- * info->read_raw:
- Raw data reading function. Used for both raw channel access
- and for associate parameters such as offsets and scales.
- * info->write_raw:
- Raw value writing function. Used for writable device values such
- as DAC values and caliboffset.
- * info->read_event_config:
- Typically only set if there are some interrupt lines. This
- is used to read if an on sensor event detector is enabled.
- * info->write_event_config:
- Enable / disable an on sensor event detector.
- * info->read_event_value:
- Read value associated with on sensor event detectors. Note that
- the meaning of the returned value is dependent on the event
- type.
- * info->write_event_value:
- Write the value associated with on sensor event detectors. E.g.
- a threshold above which an interrupt occurs. Note that the
- meaning of the value to be set is event type dependant.
-
-- indio_dev->modes:
- Specify whether direct access and / or ring buffer access is supported.
-- indio_dev->ring:
- An optional associated buffer.
-- indio_dev->pollfunc:
- Poll function related elements. This controls what occurs when a trigger
- to which this device is attached sends an event.
-- indio_dev->channels:
- Specification of device channels. Most attributes etc are built
- form this spec.
-- indio_dev->num_channels:
- How many channels are there?
-
-Once these are set up, a call to iio_device_register(indio_dev),
-will register the device with the iio core.
-
-Worth noting here is that, if a ring buffer is to be used, it can be
-allocated prior to registering the device with the iio-core, but must
-be registered afterwards (otherwise the whole parentage of devices
-gets confused)
-
-On remove, iio_device_unregister(indio_dev) will remove the device from
-the core, and iio_device_free will clean up.
diff --git a/drivers/staging/iio/Documentation/generic_buffer.c b/drivers/staging/iio/Documentation/generic_buffer.c
deleted file mode 100644
index bf55335..0000000
--- a/drivers/staging/iio/Documentation/generic_buffer.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/* Industrialio buffer test code.
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * 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 primarily intended as an example application.
- * Reads the current buffer setup from sysfs and starts a short capture
- * from the specified device, pretty printing the result after appropriate
- * conversion.
- *
- * Command line parameters
- * generic_buffer -n<device_name> -t<trigger_name>
- * If trigger name is not specified the program assumes you want a dataready
- * trigger associated with the device and goes looking for it.
- *
- */
-
-#include<unistd.h>
-#include<dirent.h>
-#include<fcntl.h>
-#include<stdio.h>
-#include<errno.h>
-#include<sys/stat.h>
-#include<sys/dir.h>
-#include<linux/types.h>
-#include<string.h>
-#include<poll.h>
-#include<endian.h>
-#include "iio_utils.h"
-
-/**
- * size_from_channelarray() - calculate the storage size of a scan
- * @channels: the channel info array
- * @num_channels: size of the channel info array
- *
- * Has the side effect of filling the channels[i].location values used
- * in processing the buffer output.
- **/
-int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
-{
- int bytes = 0;
- int i = 0;
- while (i< num_channels) {
- if (bytes % channels[i].bytes == 0)
- channels[i].location = bytes;
- else
- channels[i].location = bytes - bytes%channels[i].bytes
- + channels[i].bytes;
- bytes = channels[i].location + channels[i].bytes;
- i++;
- }
- return bytes;
-}
-
-void print2byte(int input, struct iio_channel_info *info)
-{
- /* First swap if incorrect endian */
-
- if (info->be)
- input = be16toh((uint16_t)input);
- else
- input = le16toh((uint16_t)input);
-
- /* shift before conversion to avoid sign extension
- of left aligned data */
- input = input>> info->shift;
- if (info->is_signed) {
- int16_t val = input;
- val&= (1<< info->bits_used) - 1;
- val = (int16_t)(val<< (16 - info->bits_used))>>
- (16 - info->bits_used);
- printf("%05f ", val,
- (float)(val + info->offset)*info->scale);
- } else {
- uint16_t val = input;
- val&= (1<< info->bits_used) - 1;
- printf("%05f ", ((float)val + info->offset)*info->scale);
- }
-}
-/**
- * process_scan() - print out the values in SI units
- * @data: pointer to the start of the scan
- * @infoarray: information about the channels. Note
- * size_from_channelarray must have been called first to fill the
- * location offsets.
- * @num_channels: the number of active channels
- **/
-void process_scan(char *data,
- struct iio_channel_info *infoarray,
- int num_channels)
-{
- int k;
- for (k = 0; k< num_channels; k++)
- switch (infoarray[k].bytes) {
- /* only a few cases implemented so far */
- case 2:
- print2byte(*(uint16_t *)(data + infoarray[k].location),
- &infoarray[k]);
- break;
- case 8:
- if (infoarray[k].is_signed) {
- int64_t val = *(int64_t *)
- (data +
- infoarray[k].location);
- if ((val>> infoarray[k].bits_used)& 1)
- val = (val& infoarray[k].mask) |
- ~infoarray[k].mask;
- /* special case for timestamp */
- if (infoarray[k].scale == 1.0f&&
- infoarray[k].offset == 0.0f)
- printf(" %lld", val);
- else
- printf("%05f ", ((float)val +
- infoarray[k].offset)*
- infoarray[k].scale);
- }
- break;
- default:
- break;
- }
- printf("\n");
-}
-
-int main(int argc, char **argv)
-{
- unsigned long num_loops = 2;
- unsigned long timedelay = 1000000;
- unsigned long buf_len = 128;
-
-
- int ret, c, i, j, toread;
-
- FILE *fp_ev;
- int fp;
-
- int num_channels;
- char *trigger_name = NULL, *device_name = NULL;
- char *dev_dir_name, *buf_dir_name;
-
- int datardytrigger = 1;
- char *data;
- ssize_t read_size;
- int dev_num, trig_num;
- char *buffer_access;
- int scan_size;
- int noevents = 0;
- char *dummy;
-
- struct iio_channel_info *infoarray;
-
- while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) {
- switch (c) {
- case 'n':
- device_name = optarg;
- break;
- case 't':
- trigger_name = optarg;
- datardytrigger = 0;
- break;
- case 'e':
- noevents = 1;
- break;
- case 'c':
- num_loops = strtoul(optarg,&dummy, 10);
- break;
- case 'w':
- timedelay = strtoul(optarg,&dummy, 10);
- break;
- case 'l':
- buf_len = strtoul(optarg,&dummy, 10);
- break;
- case '?':
- return -1;
- }
- }
-
- if (device_name == NULL)
- return -1;
-
- /* Find the device requested */
- dev_num = find_type_by_name(device_name, "iio:device");
- if (dev_num< 0) {
- printf("Failed to find the %s\n", device_name);
- ret = -ENODEV;
- goto error_ret;
- }
- printf("iio device number being used is %d\n", dev_num);
-
- asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
- if (trigger_name == NULL) {
- /*
- * Build the trigger name. If it is device associated it's
- * name is<device_name>_dev[n] where n matches the device
- * number found above
- */
- ret = asprintf(&trigger_name,
- "%s-dev%d", device_name, dev_num);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_ret;
- }
- }
-
- /* Verify the trigger exists */
- trig_num = find_type_by_name(trigger_name, "trigger");
- if (trig_num< 0) {
- printf("Failed to find the trigger %s\n", trigger_name);
- ret = -ENODEV;
- goto error_free_triggername;
- }
- printf("iio trigger number being used is %d\n", trig_num);
-
- /*
- * Parse the files in scan_elements to identify what channels are
- * present
- */
- ret = build_channel_array(dev_dir_name,&infoarray,&num_channels);
- if (ret) {
- printf("Problem reading scan element information\n");
- printf("diag %s\n", dev_dir_name);
- goto error_free_triggername;
- }
-
- /*
- * Construct the directory name for the associated buffer.
- * As we know that the lis3l02dq has only one buffer this may
- * be built rather than found.
- */
- ret = asprintf(&buf_dir_name,
- "%siio:device%d/buffer", iio_dir, dev_num);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_free_triggername;
- }
- printf("%s %s\n", dev_dir_name, trigger_name);
- /* Set the device trigger to be the data rdy trigger found above */
- ret = write_sysfs_string_and_verify("trigger/current_trigger",
- dev_dir_name,
- trigger_name);
- if (ret< 0) {
- printf("Failed to write current_trigger file\n");
- goto error_free_buf_dir_name;
- }
-
- /* Setup ring buffer parameters */
- ret = write_sysfs_int("length", buf_dir_name, buf_len);
- if (ret< 0)
- goto error_free_buf_dir_name;
-
- /* Enable the buffer */
- ret = write_sysfs_int("enable", buf_dir_name, 1);
- if (ret< 0)
- goto error_free_buf_dir_name;
- scan_size = size_from_channelarray(infoarray, num_channels);
- data = malloc(scan_size*buf_len);
- if (!data) {
- ret = -ENOMEM;
- goto error_free_buf_dir_name;
- }
-
- ret = asprintf(&buffer_access, "/dev/iio:device%d", dev_num);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_free_data;
- }
-
- /* Attempt to open non blocking the access dev */
- fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
- if (fp == -1) { /*If it isn't there make the node */
- printf("Failed to open %s\n", buffer_access);
- ret = -errno;
- goto error_free_buffer_access;
- }
-
- /* Wait for events 10 times */
- for (j = 0; j< num_loops; j++) {
- if (!noevents) {
- struct pollfd pfd = {
- .fd = fp,
- .events = POLLIN,
- };
-
- poll(&pfd, 1, -1);
- toread = buf_len;
-
- } else {
- usleep(timedelay);
- toread = 64;
- }
-
- read_size = read(fp,
- data,
- toread*scan_size);
- if (read_size == -EAGAIN) {
- printf("nothing available\n");
- continue;
- }
- for (i = 0; i< read_size/scan_size; i++)
- process_scan(data + scan_size*i,
- infoarray,
- num_channels);
- }
-
- /* Stop the ring buffer */
- ret = write_sysfs_int("enable", buf_dir_name, 0);
- if (ret< 0)
- goto error_close_buffer_access;
-
- /* Disconnect from the trigger - just write a dummy name.*/
- write_sysfs_string("trigger/current_trigger",
- dev_dir_name, "NULL");
-
-error_close_buffer_access:
- close(fp);
-error_free_data:
- free(data);
-error_free_buffer_access:
- free(buffer_access);
-error_free_buf_dir_name:
- free(buf_dir_name);
-error_free_triggername:
- if (datardytrigger)
- free(trigger_name);
-error_ret:
- return ret;
-}
diff --git a/drivers/staging/iio/Documentation/iio_event_monitor.c b/drivers/staging/iio/Documentation/iio_event_monitor.c
deleted file mode 100644
index 2227584..0000000
--- a/drivers/staging/iio/Documentation/iio_event_monitor.c
+++ /dev/null
@@ -1,241 +0,0 @@
-/* Industrialio event test code.
- *
- * Copyright (c) 2011-2012 Lars-Peter Clausen<lars@xxxxxxxxxx>
- *
- * 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 primarily intended as an example application.
- * Reads the current buffer setup from sysfs and starts a short capture
- * from the specified device, pretty printing the result after appropriate
- * conversion.
- *
- * Usage:
- * iio_event_monitor<device_name>
- *
- */
-
-#define _GNU_SOURCE
-
-#include<unistd.h>
-#include<stdbool.h>
-#include<stdio.h>
-#include<errno.h>
-#include<string.h>
-#include<poll.h>
-#include<fcntl.h>
-#include<sys/ioctl.h>
-#include "iio_utils.h"
-#include<linux/iio/events.h>
-
-static const char * const iio_chan_type_name_spec[] = {
- [IIO_VOLTAGE] = "voltage",
- [IIO_CURRENT] = "current",
- [IIO_POWER] = "power",
- [IIO_ACCEL] = "accel",
- [IIO_ANGL_VEL] = "anglvel",
- [IIO_MAGN] = "magn",
- [IIO_LIGHT] = "illuminance",
- [IIO_INTENSITY] = "intensity",
- [IIO_PROXIMITY] = "proximity",
- [IIO_TEMP] = "temp",
- [IIO_INCLI] = "incli",
- [IIO_ROT] = "rot",
- [IIO_ANGL] = "angl",
- [IIO_TIMESTAMP] = "timestamp",
- [IIO_CAPACITANCE] = "capacitance",
-};
-
-static const char * const iio_ev_type_text[] = {
- [IIO_EV_TYPE_THRESH] = "thresh",
- [IIO_EV_TYPE_MAG] = "mag",
- [IIO_EV_TYPE_ROC] = "roc",
- [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
- [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
-};
-
-static const char * const iio_ev_dir_text[] = {
- [IIO_EV_DIR_EITHER] = "either",
- [IIO_EV_DIR_RISING] = "rising",
- [IIO_EV_DIR_FALLING] = "falling"
-};
-
-static const char * const iio_modifier_names[] = {
- [IIO_MOD_X] = "x",
- [IIO_MOD_Y] = "y",
- [IIO_MOD_Z] = "z",
- [IIO_MOD_LIGHT_BOTH] = "both",
- [IIO_MOD_LIGHT_IR] = "ir",
-};
-
-static bool event_is_known(struct iio_event_data *event)
-{
- enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
- enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
- enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
- enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
-
- switch (type) {
- case IIO_VOLTAGE:
- case IIO_CURRENT:
- case IIO_POWER:
- case IIO_ACCEL:
- case IIO_ANGL_VEL:
- case IIO_MAGN:
- case IIO_LIGHT:
- case IIO_INTENSITY:
- case IIO_PROXIMITY:
- case IIO_TEMP:
- case IIO_INCLI:
- case IIO_ROT:
- case IIO_ANGL:
- case IIO_TIMESTAMP:
- case IIO_CAPACITANCE:
- break;
- default:
- return false;
- }
-
- switch (mod) {
- case IIO_NO_MOD:
- case IIO_MOD_X:
- case IIO_MOD_Y:
- case IIO_MOD_Z:
- case IIO_MOD_LIGHT_BOTH:
- case IIO_MOD_LIGHT_IR:
- break;
- default:
- return false;
- }
-
- switch (ev_type) {
- case IIO_EV_TYPE_THRESH:
- case IIO_EV_TYPE_MAG:
- case IIO_EV_TYPE_ROC:
- case IIO_EV_TYPE_THRESH_ADAPTIVE:
- case IIO_EV_TYPE_MAG_ADAPTIVE:
- break;
- default:
- return false;
- }
-
- switch (dir) {
- case IIO_EV_DIR_EITHER:
- case IIO_EV_DIR_RISING:
- case IIO_EV_DIR_FALLING:
- break;
- default:
- return false;
- }
-
- return true;
-}
-
-static void print_event(struct iio_event_data *event)
-{
- enum iio_chan_type type = IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event->id);
- enum iio_modifier mod = IIO_EVENT_CODE_EXTRACT_MODIFIER(event->id);
- enum iio_event_type ev_type = IIO_EVENT_CODE_EXTRACT_TYPE(event->id);
- enum iio_event_direction dir = IIO_EVENT_CODE_EXTRACT_DIR(event->id);
- int chan = IIO_EVENT_CODE_EXTRACT_CHAN(event->id);
- int chan2 = IIO_EVENT_CODE_EXTRACT_CHAN2(event->id);
- bool diff = IIO_EVENT_CODE_EXTRACT_DIFF(event->id);
-
- if (!event_is_known(event)) {
- printf("Unknown event: time: %lld, id: %llx\n",
- event->timestamp, event->id);
- return;
- }
-
- printf("Event: time: %lld, ", event->timestamp);
-
- if (mod != IIO_NO_MOD) {
- printf("type: %s(%s), ",
- iio_chan_type_name_spec[type],
- iio_modifier_names[mod]);
- } else {
- printf("type: %s, ",
- iio_chan_type_name_spec[type]);
- }
-
- if (diff&& chan>= 0&& chan2>= 0)
- printf("channel: %d-%d, ", chan, chan2);
- else if (chan>= 0)
- printf("channel: %d, ", chan);
-
- printf("evtype: %s, direction: %s\n",
- iio_ev_type_text[ev_type],
- iio_ev_dir_text[dir]);
-}
-
-int main(int argc, char **argv)
-{
- struct iio_event_data event;
- const char *device_name;
- char *chrdev_name;
- int ret;
- int dev_num;
- int fd, event_fd;
-
- if (argc<= 1) {
- printf("Usage: %s<device_name>\n", argv[0]);
- return -1;
- }
-
- device_name = argv[1];
-
- dev_num = find_type_by_name(device_name, "iio:device");
- if (dev_num>= 0) {
- printf("Found IIO device with name %s with device number %d\n",
- device_name, dev_num);
- ret = asprintf(&chrdev_name, "/dev/iio:device%d", dev_num);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_ret;
- }
- } else {
- /* If we can't find a IIO device by name assume device_name is a
- IIO chrdev */
- chrdev_name = strdup(device_name);
- }
-
- fd = open(chrdev_name, 0);
- if (fd == -1) {
- fprintf(stdout, "Failed to open %s\n", chrdev_name);
- ret = -errno;
- goto error_free_chrdev_name;
- }
-
- ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL,&event_fd);
-
- close(fd);
-
- if (ret == -1 || event_fd == -1) {
- fprintf(stdout, "Failed to retrieve event fd\n");
- ret = -errno;
- goto error_free_chrdev_name;
- }
-
- while (true) {
- ret = read(event_fd,&event, sizeof(event));
- if (ret == -1) {
- if (errno == EAGAIN) {
- printf("nothing available\n");
- continue;
- } else {
- perror("Failed to read event from device");
- ret = -errno;
- break;
- }
- }
-
- print_event(&event);
- }
-
- close(event_fd);
-error_free_chrdev_name:
- free(chrdev_name);
-error_ret:
- return ret;
-}
diff --git a/drivers/staging/iio/Documentation/iio_utils.h b/drivers/staging/iio/Documentation/iio_utils.h
deleted file mode 100644
index 6f3a392..0000000
--- a/drivers/staging/iio/Documentation/iio_utils.h
+++ /dev/null
@@ -1,639 +0,0 @@
-/* IIO - useful set of util functionality
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * 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.
- */
-
-/* Made up value to limit allocation sizes */
-#include<string.h>
-#include<stdlib.h>
-#include<ctype.h>
-#include<stdio.h>
-#include<stdint.h>
-#include<dirent.h>
-
-#define IIO_MAX_NAME_LENGTH 30
-
-#define FORMAT_SCAN_ELEMENTS_DIR "%s/scan_elements"
-#define FORMAT_TYPE_FILE "%s_type"
-
-const char *iio_dir = "/sys/bus/iio/devices/";
-
-/**
- * iioutils_break_up_name() - extract generic name from full channel name
- * @full_name: the full channel name
- * @generic_name: the output generic channel name
- **/
-static int iioutils_break_up_name(const char *full_name,
- char **generic_name)
-{
- char *current;
- char *w, *r;
- char *working;
- current = strdup(full_name);
- working = strtok(current, "_\0");
- w = working;
- r = working;
-
- while (*r != '\0') {
- if (!isdigit(*r)) {
- *w = *r;
- w++;
- }
- r++;
- }
- *w = '\0';
- *generic_name = strdup(working);
- free(current);
-
- return 0;
-}
-
-/**
- * struct iio_channel_info - information about a given channel
- * @name: channel name
- * @generic_name: general name for channel type
- * @scale: scale factor to be applied for conversion to si units
- * @offset: offset to be applied for conversion to si units
- * @index: the channel index in the buffer output
- * @bytes: number of bytes occupied in buffer output
- * @mask: a bit mask for the raw output
- * @is_signed: is the raw value stored signed
- * @enabled: is this channel enabled
- **/
-struct iio_channel_info {
- char *name;
- char *generic_name;
- float scale;
- float offset;
- unsigned index;
- unsigned bytes;
- unsigned bits_used;
- unsigned shift;
- uint64_t mask;
- unsigned be;
- unsigned is_signed;
- unsigned enabled;
- unsigned location;
-};
-
-/**
- * iioutils_get_type() - find and process _type attribute data
- * @is_signed: output whether channel is signed
- * @bytes: output how many bytes the channel storage occupies
- * @mask: output a bit mask for the raw data
- * @be: big endian
- * @device_dir: the iio device directory
- * @name: the channel name
- * @generic_name: the channel type name
- **/
-inline int iioutils_get_type(unsigned *is_signed,
- unsigned *bytes,
- unsigned *bits_used,
- unsigned *shift,
- uint64_t *mask,
- unsigned *be,
- const char *device_dir,
- const char *name,
- const char *generic_name)
-{
- FILE *sysfsfp;
- int ret;
- DIR *dp;
- char *scan_el_dir, *builtname, *builtname_generic, *filename = 0;
- char signchar, endianchar;
- unsigned padint;
- const struct dirent *ent;
-
- ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_ret;
- }
- ret = asprintf(&builtname, FORMAT_TYPE_FILE, name);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_free_scan_el_dir;
- }
- ret = asprintf(&builtname_generic, FORMAT_TYPE_FILE, generic_name);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_free_builtname;
- }
-
- dp = opendir(scan_el_dir);
- if (dp == NULL) {
- ret = -errno;
- goto error_free_builtname_generic;
- }
- while (ent = readdir(dp), ent != NULL)
- /*
- * Do we allow devices to override a generic name with
- * a specific one?
- */
- if ((strcmp(builtname, ent->d_name) == 0) ||
- (strcmp(builtname_generic, ent->d_name) == 0)) {
- ret = asprintf(&filename,
- "%s/%s", scan_el_dir, ent->d_name);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_closedir;
- }
- sysfsfp = fopen(filename, "r");
- if (sysfsfp == NULL) {
- printf("failed to open %s\n", filename);
- ret = -errno;
- goto error_free_filename;
- }
-
- ret = fscanf(sysfsfp,
- "%ce:%c%u/%u>>%u",
- &endianchar,
- &signchar,
- bits_used,
- &padint, shift);
- if (ret< 0) {
- printf("failed to pass scan type description\n");
- return ret;
- }
- *be = (endianchar == 'b');
- *bytes = padint / 8;
- if (*bits_used == 64)
- *mask = ~0;
- else
- *mask = (1<< *bits_used) - 1;
- if (signchar == 's')
- *is_signed = 1;
- else
- *is_signed = 0;
- fclose(sysfsfp);
- free(filename);
-
- filename = 0;
- }
-error_free_filename:
- if (filename)
- free(filename);
-error_closedir:
- closedir(dp);
-error_free_builtname_generic:
- free(builtname_generic);
-error_free_builtname:
- free(builtname);
-error_free_scan_el_dir:
- free(scan_el_dir);
-error_ret:
- return ret;
-}
-
-inline int iioutils_get_param_float(float *output,
- const char *param_name,
- const char *device_dir,
- const char *name,
- const char *generic_name)
-{
- FILE *sysfsfp;
- int ret;
- DIR *dp;
- char *builtname, *builtname_generic;
- char *filename = NULL;
- const struct dirent *ent;
-
- ret = asprintf(&builtname, "%s_%s", name, param_name);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_ret;
- }
- ret = asprintf(&builtname_generic,
- "%s_%s", generic_name, param_name);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_free_builtname;
- }
- dp = opendir(device_dir);
- if (dp == NULL) {
- ret = -errno;
- goto error_free_builtname_generic;
- }
- while (ent = readdir(dp), ent != NULL)
- if ((strcmp(builtname, ent->d_name) == 0) ||
- (strcmp(builtname_generic, ent->d_name) == 0)) {
- ret = asprintf(&filename,
- "%s/%s", device_dir, ent->d_name);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_closedir;
- }
- sysfsfp = fopen(filename, "r");
- if (!sysfsfp) {
- ret = -errno;
- goto error_free_filename;
- }
- fscanf(sysfsfp, "%f", output);
- break;
- }
-error_free_filename:
- if (filename)
- free(filename);
-error_closedir:
- closedir(dp);
-error_free_builtname_generic:
- free(builtname_generic);
-error_free_builtname:
- free(builtname);
-error_ret:
- return ret;
-}
-
-/**
- * bsort_channel_array_by_index() - reorder so that the array is in index order
- *
- **/
-
-inline void bsort_channel_array_by_index(struct iio_channel_info **ci_array,
- int cnt)
-{
-
- struct iio_channel_info temp;
- int x, y;
-
- for (x = 0; x< cnt; x++)
- for (y = 0; y< (cnt - 1); y++)
- if ((*ci_array)[y].index> (*ci_array)[y+1].index) {
- temp = (*ci_array)[y + 1];
- (*ci_array)[y + 1] = (*ci_array)[y];
- (*ci_array)[y] = temp;
- }
-}
-
-/**
- * build_channel_array() - function to figure out what channels are present
- * @device_dir: the IIO device directory in sysfs
- * @
- **/
-inline int build_channel_array(const char *device_dir,
- struct iio_channel_info **ci_array,
- int *counter)
-{
- DIR *dp;
- FILE *sysfsfp;
- int count, temp, i;
- struct iio_channel_info *current;
- int ret;
- const struct dirent *ent;
- char *scan_el_dir;
- char *filename;
-
- *counter = 0;
- ret = asprintf(&scan_el_dir, FORMAT_SCAN_ELEMENTS_DIR, device_dir);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_ret;
- }
- dp = opendir(scan_el_dir);
- if (dp == NULL) {
- ret = -errno;
- goto error_free_name;
- }
- while (ent = readdir(dp), ent != NULL)
- if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
- "_en") == 0) {
- ret = asprintf(&filename,
- "%s/%s", scan_el_dir, ent->d_name);
- if (ret< 0) {
- ret = -ENOMEM;
- goto error_close_dir;
- }
- sysfsfp = fopen(filename, "r");
- if (sysfsfp == NULL) {
- ret = -errno;
- free(filename);
- goto error_close_dir;
- }
- fscanf(sysfsfp, "%u",&ret);
- if (ret == 1)
- (*counter)++;
- fclose(sysfsfp);
- free(filename);
- }
- *ci_array = malloc(sizeof(**ci_array) * (*counter));
- if (*ci_array == NULL) {
- ret = -ENOMEM;
- goto error_close_dir;
- }
- seekdir(dp, 0);
- count = 0;
- while (ent = readdir(dp), ent != NULL) {
- if (strcmp(ent->d_name + strlen(ent->d_name) - strlen("_en"),
- "_en") == 0) {
- current =&(*ci_array)[count++];
- ret = asprintf(&filename,
- "%s/%s", scan_el_dir, ent->d_name);
- if (ret< 0) {
- ret = -ENOMEM;
- /* decrement count to avoid freeing name */
- count--;
- goto error_cleanup_array;
- }
- sysfsfp = fopen(filename, "r");
- if (sysfsfp == NULL) {
- free(filename);
- ret = -errno;
- goto error_cleanup_array;
- }
- fscanf(sysfsfp, "%u",¤t->enabled);
- fclose(sysfsfp);
-
- if (!current->enabled) {
- free(filename);
- count--;
- continue;
- }
-
- current->scale = 1.0;
- current->offset = 0;
- current->name = strndup(ent->d_name,
- strlen(ent->d_name) -
- strlen("_en"));
- if (current->name == NULL) {
- free(filename);
- ret = -ENOMEM;
- goto error_cleanup_array;
- }
- /* Get the generic and specific name elements */
- ret = iioutils_break_up_name(current->name,
- ¤t->generic_name);
- if (ret) {
- free(filename);
- goto error_cleanup_array;
- }
- ret = asprintf(&filename,
- "%s/%s_index",
- scan_el_dir,
- current->name);
- if (ret< 0) {
- free(filename);
- ret = -ENOMEM;
- goto error_cleanup_array;
- }
- sysfsfp = fopen(filename, "r");
- fscanf(sysfsfp, "%u",¤t->index);
- fclose(sysfsfp);
- free(filename);
- /* Find the scale */
- ret = iioutils_get_param_float(¤t->scale,
- "scale",
- device_dir,
- current->name,
- current->generic_name);
- if (ret< 0)
- goto error_cleanup_array;
- ret = iioutils_get_param_float(¤t->offset,
- "offset",
- device_dir,
- current->name,
- current->generic_name);
- if (ret< 0)
- goto error_cleanup_array;
- ret = iioutils_get_type(¤t->is_signed,
- ¤t->bytes,
- ¤t->bits_used,
- ¤t->shift,
- ¤t->mask,
- ¤t->be,
- device_dir,
- current->name,
- current->generic_name);
- }
- }
-
- closedir(dp);
- /* reorder so that the array is in index order */
- bsort_channel_array_by_index(ci_array, *counter);
-
- return 0;
-
-error_cleanup_array:
- for (i = count - 1; i>= 0; i--)
- free((*ci_array)[i].name);
- free(*ci_array);
-error_close_dir:
- closedir(dp);
-error_free_name:
- free(scan_el_dir);
-error_ret:
- return ret;
-}
-
-/**
- * find_type_by_name() - function to match top level types by name
- * @name: top level type instance name
- * @type: the type of top level instance being sort
- *
- * Typical types this is used for are device and trigger.
- **/
-inline int find_type_by_name(const char *name, const char *type)
-{
- const struct dirent *ent;
- int number, numstrlen;
-
- FILE *nameFile;
- DIR *dp;
- char thisname[IIO_MAX_NAME_LENGTH];
- char *filename;
-
- dp = opendir(iio_dir);
- if (dp == NULL) {
- printf("No industrialio devices available");
- return -ENODEV;
- }
-
- while (ent = readdir(dp), ent != NULL) {
- if (strcmp(ent->d_name, ".") != 0&&
- strcmp(ent->d_name, "..") != 0&&
- strlen(ent->d_name)> strlen(type)&&
- strncmp(ent->d_name, type, strlen(type)) == 0) {
- numstrlen = sscanf(ent->d_name + strlen(type),
- "%d",
- &number);
- /* verify the next character is not a colon */
- if (strncmp(ent->d_name + strlen(type) + numstrlen,
- ":",
- 1) != 0) {
- filename = malloc(strlen(iio_dir)
- + strlen(type)
- + numstrlen
- + 6);
- if (filename == NULL)
- return -ENOMEM;
- sprintf(filename, "%s%s%d/name",
- iio_dir,
- type,
- number);
- nameFile = fopen(filename, "r");
- if (!nameFile)
- continue;
- free(filename);
- fscanf(nameFile, "%s", thisname);
- if (strcmp(name, thisname) == 0)
- return number;
- fclose(nameFile);
- }
- }
- }
- return -ENODEV;
-}
-
-inline int _write_sysfs_int(char *filename, char *basedir, int val, int verify)
-{
- int ret;
- FILE *sysfsfp;
- int test;
- char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
- if (temp == NULL)
- return -ENOMEM;
- sprintf(temp, "%s/%s", basedir, filename);
- sysfsfp = fopen(temp, "w");
- if (sysfsfp == NULL) {
- printf("failed to open %s\n", temp);
- ret = -errno;
- goto error_free;
- }
- fprintf(sysfsfp, "%d", val);
- fclose(sysfsfp);
- if (verify) {
- sysfsfp = fopen(temp, "r");
- if (sysfsfp == NULL) {
- printf("failed to open %s\n", temp);
- ret = -errno;
- goto error_free;
- }
- fscanf(sysfsfp, "%d",&test);
- if (test != val) {
- printf("Possible failure in int write %d to %s%s\n",
- val,
- basedir,
- filename);
- ret = -1;
- }
- }
-error_free:
- free(temp);
- return ret;
-}
-
-int write_sysfs_int(char *filename, char *basedir, int val)
-{
- return _write_sysfs_int(filename, basedir, val, 0);
-}
-
-int write_sysfs_int_and_verify(char *filename, char *basedir, int val)
-{
- return _write_sysfs_int(filename, basedir, val, 1);
-}
-
-int _write_sysfs_string(char *filename, char *basedir, char *val, int verify)
-{
- int ret = 0;
- FILE *sysfsfp;
- char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
- if (temp == NULL) {
- printf("Memory allocation failed\n");
- return -ENOMEM;
- }
- sprintf(temp, "%s/%s", basedir, filename);
- sysfsfp = fopen(temp, "w");
- if (sysfsfp == NULL) {
- printf("Could not open %s\n", temp);
- ret = -errno;
- goto error_free;
- }
- fprintf(sysfsfp, "%s", val);
- fclose(sysfsfp);
- if (verify) {
- sysfsfp = fopen(temp, "r");
- if (sysfsfp == NULL) {
- printf("could not open file to verify\n");
- ret = -errno;
- goto error_free;
- }
- fscanf(sysfsfp, "%s", temp);
- if (strcmp(temp, val) != 0) {
- printf("Possible failure in string write of %s "
- "Should be %s "
- "written to %s\%s\n",
- temp,
- val,
- basedir,
- filename);
- ret = -1;
- }
- }
-error_free:
- free(temp);
-
- return ret;
-}
-
-/**
- * write_sysfs_string_and_verify() - string write, readback and verify
- * @filename: name of file to write to
- * @basedir: the sysfs directory in which the file is to be found
- * @val: the string to write
- **/
-int write_sysfs_string_and_verify(char *filename, char *basedir, char *val)
-{
- return _write_sysfs_string(filename, basedir, val, 1);
-}
-
-int write_sysfs_string(char *filename, char *basedir, char *val)
-{
- return _write_sysfs_string(filename, basedir, val, 0);
-}
-
-int read_sysfs_posint(char *filename, char *basedir)
-{
- int ret;
- FILE *sysfsfp;
- char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
- if (temp == NULL) {
- printf("Memory allocation failed");
- return -ENOMEM;
- }
- sprintf(temp, "%s/%s", basedir, filename);
- sysfsfp = fopen(temp, "r");
- if (sysfsfp == NULL) {
- ret = -errno;
- goto error_free;
- }
- fscanf(sysfsfp, "%d\n",&ret);
- fclose(sysfsfp);
-error_free:
- free(temp);
- return ret;
-}
-
-int read_sysfs_float(char *filename, char *basedir, float *val)
-{
- float ret = 0;
- FILE *sysfsfp;
- char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
- if (temp == NULL) {
- printf("Memory allocation failed");
- return -ENOMEM;
- }
- sprintf(temp, "%s/%s", basedir, filename);
- sysfsfp = fopen(temp, "r");
- if (sysfsfp == NULL) {
- ret = -errno;
- goto error_free;
- }
- fscanf(sysfsfp, "%f\n", val);
- fclose(sysfsfp);
-error_free:
- free(temp);
- return ret;
-}
diff --git a/drivers/staging/iio/Documentation/inkernel.txt b/drivers/staging/iio/Documentation/inkernel.txt
deleted file mode 100644
index a05823e..0000000
--- a/drivers/staging/iio/Documentation/inkernel.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-Industrial I/O Subsystem in kernel consumers.
-
-The IIO subsystem can act as a layer under other elements of the kernel
-providing a means of obtaining ADC type readings or of driving DAC type
-signals. The functionality supported will grow as use cases arise.
-
-Describing the channel mapping (iio/machine.h)
-
-Channel associations are described using:
-
-struct iio_map {
- const char *adc_channel_label;
- const char *consumer_dev_name;
- const char *consumer_channel;
-};
-
-adc_channel_label identifies the channel on the IIO device by being
-matched against the datasheet_name field of the iio_chan_spec.
-
-consumer_dev_name allows identification of the consumer device.
-This are then used to find the channel mapping from the consumer device (see
-below).
-
-Finally consumer_channel is a string identifying the channel to the consumer.
-(Perhaps 'battery_voltage' or similar).
-
-An array of these structures is then passed to the IIO driver.
-
-Supporting in kernel interfaces in the driver (driver.h)
-
-The driver must provide datasheet_name values for its channels and
-must pass the iio_map structures and a pointer to its own iio_dev structure
- on to the core via a call to iio_map_array_register. On removal,
-iio_map_array_unregister reverses this process.
-
-The result of this is that the IIO core now has all the information needed
-to associate a given channel with the consumer requesting it.
-
-Acting as an IIO consumer (consumer.h)
-
-The consumer first has to obtain an iio_channel structure from the core
-by calling iio_channel_get(). The correct channel is identified by:
-
-* matching dev or dev_name against consumer_dev and consumer_dev_name
-* matching consumer_channel against consumer_channel in the map
-
-There are then a number of functions that can be used to get information
-about this channel such as it's current reading.
-
-e.g.
-iio_st_read_channel_raw() - get a reading
-iio_st_read_channel_type() - get the type of channel
-
-There is also provision for retrieving all of the channels associated
-with a given consumer. This is useful for generic drivers such as
-iio_hwmon where the number and naming of channels is not known by the
-consumer driver. To do this, use iio_st_channel_get_all.
-
diff --git a/drivers/staging/iio/Documentation/overview.txt b/drivers/staging/iio/Documentation/overview.txt
deleted file mode 100644
index afc39ec..0000000
--- a/drivers/staging/iio/Documentation/overview.txt
+++ /dev/null
@@ -1,57 +0,0 @@
-Overview of IIO
-
-The Industrial I/O subsystem is intended to provide support for devices
-that in some sense are analog to digital converters (ADCs). As many
-actual devices combine some ADCs with digital to analog converters
-(DACs) that functionality is also supported.
-
-The aim is to fill the gap between the somewhat similar hwmon and
-input subsystems. Hwmon is very much directed at low sample rate
-sensors used in applications such as fan speed control and temperature
-measurement. Input is, as it's name suggests focused on input
-devices. In some cases there is considerable overlap between these and
-IIO.
-
-A typical device falling into this category would be connected via SPI
-or I2C.
-
-Functionality of IIO
-
-* Basic device registration and handling. This is very similar to
-hwmon with simple polled access to device channels via sysfs.
-
-* Event chrdevs. These are similar to input in that they provide a
-route to user space for hardware triggered events. Such events include
-threshold detectors, free-fall detectors and more complex action
-detection. The events themselves are currently very simple with
-merely an event code and a timestamp. Any data associated with the
-event must be accessed via polling.
-
-Note: A given device may have one or more event channel. These events are
-turned on or off (if possible) via sysfs interfaces.
-
-* Hardware buffer support. Some recent sensors have included
-fifo / ring buffers on the sensor chip. These greatly reduce the load
-on the host CPU by buffering relatively large numbers of data samples
-based on an internal sampling clock. Examples include VTI SCA3000
-series and Analog Device ADXL345 accelerometers. Each buffer supports
-polling to establish when data is available.
-
-* Trigger and software buffer support. In many data analysis
-applications it it useful to be able to capture data based on some
-external signal (trigger). These triggers might be a data ready
-signal, a gpio line connected to some external system or an on
-processor periodic interrupt. A single trigger may initialize data
-capture or reading from a number of sensors. These triggers are
-used in IIO to fill software buffers acting in a very similar
-fashion to the hardware buffers described above.
-
-Other documentation:
-
-device.txt - elements of a typical device driver.
-
-trigger.txt - elements of a typical trigger driver.
-
-ring.txt - additional elements required for buffer support.
-
-sysfs-bus-iio - abi documentation file.
diff --git a/drivers/staging/iio/Documentation/ring.txt b/drivers/staging/iio/Documentation/ring.txt
deleted file mode 100644
index e338077..0000000
--- a/drivers/staging/iio/Documentation/ring.txt
+++ /dev/null
@@ -1,47 +0,0 @@
-Buffer support within IIO
-
-This document is intended as a general overview of the functionality
-a buffer may supply and how it is specified within IIO. For more
-specific information on a given buffer implementation, see the
-comments in the source code. Note that some drivers allow buffer
-implementation to be selected at compile time via Kconfig options.
-
-A given buffer implementation typically embeds a struct
-iio_ring_buffer and it is a pointer to this that is provided to the
-IIO core. Access to the embedding structure is typically done via
-container_of functions.
-
-struct iio_ring_buffer contains a struct iio_ring_setup_ops *setup_ops
-which in turn contains the 4 function pointers
-(preenable, postenable, predisable and postdisable).
-These are used to perform device specific steps on either side
-of the core changing it's current mode to indicate that the buffer
-is enabled or disabled (along with enabling triggering etc as appropriate).
-
-Also in struct iio_ring_buffer is a struct iio_ring_access_funcs.
-The function pointers within here are used to allow the core to handle
-as much buffer functionality as possible. Note almost all of these
-are optional.
-
-store_to
- If possible, push data to the buffer.
-
-read_last
- If possible, get the most recent scan from the buffer (without removal).
- This provides polling like functionality whilst the ring buffering is in
- use without a separate read from the device.
-
-rip_first_n
- The primary buffer reading function. Note that it may well not return
- as much data as requested.
-
-request_update
- If parameters have changed that require reinitialization or configuration of
- the buffer this will trigger it.
-
-get_bytes_per_datum, set_bytes_per_datum
- Get/set the number of bytes for a complete scan. (All samples + timestamp)
-
-get_length / set_length
- Get/set the number of complete scans that may be held by the buffer.
-
