![Lars-Peter Clausen](/assets/img/avatar_default.png)
Set the IIO device as the parent for the character device We need to make sure that the IIO device is not freed while the character device exists, otherwise the freeing of the IIO device might race against the file open callback. Do this by setting the character device's parent to the IIO device, this will cause the character device to grab a reference to the IIO device and only release it once the character device itself has been removed. Also move the registration of the character device before the registration of the IIO device to avoid the (rather theoretical case) that the IIO device is already freed again before we can add the character device and grab a reference to the IIO device. We also need to move the call to cdev_del() from iio_dev_release() to iio_device_unregister() (where it should have been in the first place anyway) to avoid a reference cycle. As iio_dev_release() is only called once all reference are dropped, but the character device holds a reference to the IIO device. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
1103 lines
26 KiB
C
1103 lines
26 KiB
C
/* The industrial I/O core
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Based on elements of hwmon and input subsystems.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <linux/kdev_t.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/cdev.h>
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#include <linux/slab.h>
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#include <linux/anon_inodes.h>
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#include <linux/debugfs.h>
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#include <linux/iio/iio.h>
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#include "iio_core.h"
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#include "iio_core_trigger.h"
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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/* IDA to assign each registered device a unique id */
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static DEFINE_IDA(iio_ida);
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static dev_t iio_devt;
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#define IIO_DEV_MAX 256
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struct bus_type iio_bus_type = {
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.name = "iio",
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};
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EXPORT_SYMBOL(iio_bus_type);
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static struct dentry *iio_debugfs_dentry;
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static const char * const iio_direction[] = {
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[0] = "in",
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[1] = "out",
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};
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static const char * const iio_chan_type_name_spec[] = {
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[IIO_VOLTAGE] = "voltage",
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[IIO_CURRENT] = "current",
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[IIO_POWER] = "power",
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[IIO_ACCEL] = "accel",
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[IIO_ANGL_VEL] = "anglvel",
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[IIO_MAGN] = "magn",
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[IIO_LIGHT] = "illuminance",
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[IIO_INTENSITY] = "intensity",
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[IIO_PROXIMITY] = "proximity",
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[IIO_TEMP] = "temp",
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[IIO_INCLI] = "incli",
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[IIO_ROT] = "rot",
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[IIO_ANGL] = "angl",
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[IIO_TIMESTAMP] = "timestamp",
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[IIO_CAPACITANCE] = "capacitance",
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[IIO_ALTVOLTAGE] = "altvoltage",
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[IIO_CCT] = "cct",
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[IIO_PRESSURE] = "pressure",
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};
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static const char * const iio_modifier_names[] = {
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[IIO_MOD_X] = "x",
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[IIO_MOD_Y] = "y",
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[IIO_MOD_Z] = "z",
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[IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
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[IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
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[IIO_MOD_LIGHT_BOTH] = "both",
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[IIO_MOD_LIGHT_IR] = "ir",
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[IIO_MOD_LIGHT_CLEAR] = "clear",
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[IIO_MOD_LIGHT_RED] = "red",
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[IIO_MOD_LIGHT_GREEN] = "green",
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[IIO_MOD_LIGHT_BLUE] = "blue",
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};
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/* relies on pairs of these shared then separate */
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static const char * const iio_chan_info_postfix[] = {
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[IIO_CHAN_INFO_RAW] = "raw",
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[IIO_CHAN_INFO_PROCESSED] = "input",
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[IIO_CHAN_INFO_SCALE] = "scale",
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[IIO_CHAN_INFO_OFFSET] = "offset",
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[IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
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[IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
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[IIO_CHAN_INFO_PEAK] = "peak_raw",
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[IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
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[IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
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[IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
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[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
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= "filter_low_pass_3db_frequency",
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[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
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[IIO_CHAN_INFO_FREQUENCY] = "frequency",
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[IIO_CHAN_INFO_PHASE] = "phase",
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[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
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[IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
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};
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const struct iio_chan_spec
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*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
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{
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int i;
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for (i = 0; i < indio_dev->num_channels; i++)
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if (indio_dev->channels[i].scan_index == si)
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return &indio_dev->channels[i];
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return NULL;
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}
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/* This turns up an awful lot */
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ssize_t iio_read_const_attr(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
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}
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EXPORT_SYMBOL(iio_read_const_attr);
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static int __init iio_init(void)
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{
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int ret;
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/* Register sysfs bus */
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ret = bus_register(&iio_bus_type);
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if (ret < 0) {
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printk(KERN_ERR
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"%s could not register bus type\n",
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__FILE__);
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goto error_nothing;
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}
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ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
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if (ret < 0) {
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printk(KERN_ERR "%s: failed to allocate char dev region\n",
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__FILE__);
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goto error_unregister_bus_type;
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}
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iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
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return 0;
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error_unregister_bus_type:
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bus_unregister(&iio_bus_type);
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error_nothing:
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return ret;
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}
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static void __exit iio_exit(void)
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{
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if (iio_devt)
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unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
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bus_unregister(&iio_bus_type);
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debugfs_remove(iio_debugfs_dentry);
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}
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#if defined(CONFIG_DEBUG_FS)
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static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct iio_dev *indio_dev = file->private_data;
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char buf[20];
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unsigned val = 0;
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ssize_t len;
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int ret;
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ret = indio_dev->info->debugfs_reg_access(indio_dev,
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indio_dev->cached_reg_addr,
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0, &val);
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if (ret)
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dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
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len = snprintf(buf, sizeof(buf), "0x%X\n", val);
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return simple_read_from_buffer(userbuf, count, ppos, buf, len);
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}
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static ssize_t iio_debugfs_write_reg(struct file *file,
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const char __user *userbuf, size_t count, loff_t *ppos)
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{
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struct iio_dev *indio_dev = file->private_data;
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unsigned reg, val;
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char buf[80];
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int ret;
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count = min_t(size_t, count, (sizeof(buf)-1));
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if (copy_from_user(buf, userbuf, count))
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return -EFAULT;
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buf[count] = 0;
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ret = sscanf(buf, "%i %i", ®, &val);
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switch (ret) {
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case 1:
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indio_dev->cached_reg_addr = reg;
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break;
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case 2:
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indio_dev->cached_reg_addr = reg;
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ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
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val, NULL);
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if (ret) {
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dev_err(indio_dev->dev.parent, "%s: write failed\n",
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__func__);
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return ret;
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}
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break;
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default:
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return -EINVAL;
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}
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return count;
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}
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static const struct file_operations iio_debugfs_reg_fops = {
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.open = simple_open,
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.read = iio_debugfs_read_reg,
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.write = iio_debugfs_write_reg,
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};
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static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
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{
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debugfs_remove_recursive(indio_dev->debugfs_dentry);
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}
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static int iio_device_register_debugfs(struct iio_dev *indio_dev)
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{
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struct dentry *d;
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if (indio_dev->info->debugfs_reg_access == NULL)
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return 0;
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if (!iio_debugfs_dentry)
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return 0;
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indio_dev->debugfs_dentry =
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debugfs_create_dir(dev_name(&indio_dev->dev),
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iio_debugfs_dentry);
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if (indio_dev->debugfs_dentry == NULL) {
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dev_warn(indio_dev->dev.parent,
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"Failed to create debugfs directory\n");
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return -EFAULT;
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}
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d = debugfs_create_file("direct_reg_access", 0644,
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indio_dev->debugfs_dentry,
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indio_dev, &iio_debugfs_reg_fops);
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if (!d) {
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iio_device_unregister_debugfs(indio_dev);
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return -ENOMEM;
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}
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return 0;
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}
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#else
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static int iio_device_register_debugfs(struct iio_dev *indio_dev)
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{
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return 0;
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}
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static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
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{
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}
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#endif /* CONFIG_DEBUG_FS */
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static ssize_t iio_read_channel_ext_info(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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const struct iio_chan_spec_ext_info *ext_info;
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ext_info = &this_attr->c->ext_info[this_attr->address];
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return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
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}
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static ssize_t iio_write_channel_ext_info(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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const struct iio_chan_spec_ext_info *ext_info;
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ext_info = &this_attr->c->ext_info[this_attr->address];
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return ext_info->write(indio_dev, ext_info->private,
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this_attr->c, buf, len);
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}
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ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
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uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
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{
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const struct iio_enum *e = (const struct iio_enum *)priv;
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unsigned int i;
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size_t len = 0;
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if (!e->num_items)
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return 0;
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for (i = 0; i < e->num_items; ++i)
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len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
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/* replace last space with a newline */
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buf[len - 1] = '\n';
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return len;
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}
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EXPORT_SYMBOL_GPL(iio_enum_available_read);
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ssize_t iio_enum_read(struct iio_dev *indio_dev,
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uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
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{
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const struct iio_enum *e = (const struct iio_enum *)priv;
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int i;
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if (!e->get)
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return -EINVAL;
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i = e->get(indio_dev, chan);
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if (i < 0)
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return i;
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else if (i >= e->num_items)
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return -EINVAL;
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return sprintf(buf, "%s\n", e->items[i]);
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}
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EXPORT_SYMBOL_GPL(iio_enum_read);
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ssize_t iio_enum_write(struct iio_dev *indio_dev,
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uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
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size_t len)
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{
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const struct iio_enum *e = (const struct iio_enum *)priv;
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unsigned int i;
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int ret;
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if (!e->set)
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return -EINVAL;
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for (i = 0; i < e->num_items; i++) {
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if (sysfs_streq(buf, e->items[i]))
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break;
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}
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if (i == e->num_items)
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return -EINVAL;
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ret = e->set(indio_dev, chan, i);
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return ret ? ret : len;
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}
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EXPORT_SYMBOL_GPL(iio_enum_write);
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static ssize_t iio_read_channel_info(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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unsigned long long tmp;
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int val, val2;
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bool scale_db = false;
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int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
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&val, &val2, this_attr->address);
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if (ret < 0)
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return ret;
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switch (ret) {
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case IIO_VAL_INT:
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return sprintf(buf, "%d\n", val);
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case IIO_VAL_INT_PLUS_MICRO_DB:
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scale_db = true;
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case IIO_VAL_INT_PLUS_MICRO:
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if (val2 < 0)
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return sprintf(buf, "-%ld.%06u%s\n", abs(val), -val2,
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scale_db ? " dB" : "");
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else
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return sprintf(buf, "%d.%06u%s\n", val, val2,
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scale_db ? " dB" : "");
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case IIO_VAL_INT_PLUS_NANO:
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if (val2 < 0)
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return sprintf(buf, "-%ld.%09u\n", abs(val), -val2);
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else
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return sprintf(buf, "%d.%09u\n", val, val2);
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case IIO_VAL_FRACTIONAL:
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tmp = div_s64((s64)val * 1000000000LL, val2);
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val2 = do_div(tmp, 1000000000LL);
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val = tmp;
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return sprintf(buf, "%d.%09u\n", val, val2);
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case IIO_VAL_FRACTIONAL_LOG2:
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tmp = (s64)val * 1000000000LL >> val2;
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val2 = do_div(tmp, 1000000000LL);
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val = tmp;
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return sprintf(buf, "%d.%09u\n", val, val2);
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default:
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return 0;
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}
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}
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/**
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* iio_str_to_fixpoint() - Parse a fixed-point number from a string
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* @str: The string to parse
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* @fract_mult: Multiplier for the first decimal place, should be a power of 10
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* @integer: The integer part of the number
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* @fract: The fractional part of the number
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*
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* Returns 0 on success, or a negative error code if the string could not be
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* parsed.
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*/
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int iio_str_to_fixpoint(const char *str, int fract_mult,
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int *integer, int *fract)
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{
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int i = 0, f = 0;
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bool integer_part = true, negative = false;
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if (str[0] == '-') {
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negative = true;
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str++;
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} else if (str[0] == '+') {
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str++;
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}
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while (*str) {
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if ('0' <= *str && *str <= '9') {
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if (integer_part) {
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i = i * 10 + *str - '0';
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} else {
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f += fract_mult * (*str - '0');
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fract_mult /= 10;
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}
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} else if (*str == '\n') {
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if (*(str + 1) == '\0')
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break;
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else
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return -EINVAL;
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} else if (*str == '.' && integer_part) {
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integer_part = false;
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} else {
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return -EINVAL;
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}
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str++;
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}
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if (negative) {
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if (i)
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i = -i;
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else
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f = -f;
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}
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*integer = i;
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*fract = f;
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return 0;
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}
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EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
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static ssize_t iio_write_channel_info(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret, fract_mult = 100000;
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int integer, fract;
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/* Assumes decimal - precision based on number of digits */
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if (!indio_dev->info->write_raw)
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return -EINVAL;
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|
|
|
if (indio_dev->info->write_raw_get_fmt)
|
|
switch (indio_dev->info->write_raw_get_fmt(indio_dev,
|
|
this_attr->c, this_attr->address)) {
|
|
case IIO_VAL_INT_PLUS_MICRO:
|
|
fract_mult = 100000;
|
|
break;
|
|
case IIO_VAL_INT_PLUS_NANO:
|
|
fract_mult = 100000000;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
|
|
integer, fract, this_attr->address);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return len;
|
|
}
|
|
|
|
static
|
|
int __iio_device_attr_init(struct device_attribute *dev_attr,
|
|
const char *postfix,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*readfunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
bool generic)
|
|
{
|
|
int ret;
|
|
char *name_format, *full_postfix;
|
|
sysfs_attr_init(&dev_attr->attr);
|
|
|
|
/* Build up postfix of <extend_name>_<modifier>_postfix */
|
|
if (chan->modified && !generic) {
|
|
if (chan->extend_name)
|
|
full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
|
|
iio_modifier_names[chan
|
|
->channel2],
|
|
chan->extend_name,
|
|
postfix);
|
|
else
|
|
full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
|
|
iio_modifier_names[chan
|
|
->channel2],
|
|
postfix);
|
|
} else {
|
|
if (chan->extend_name == NULL)
|
|
full_postfix = kstrdup(postfix, GFP_KERNEL);
|
|
else
|
|
full_postfix = kasprintf(GFP_KERNEL,
|
|
"%s_%s",
|
|
chan->extend_name,
|
|
postfix);
|
|
}
|
|
if (full_postfix == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
|
|
if (chan->differential) { /* Differential can not have modifier */
|
|
if (generic)
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
iio_chan_type_name_spec[chan->type],
|
|
full_postfix);
|
|
else if (chan->indexed)
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
chan->channel,
|
|
iio_chan_type_name_spec[chan->type],
|
|
chan->channel2,
|
|
full_postfix);
|
|
else {
|
|
WARN_ON("Differential channels must be indexed\n");
|
|
ret = -EINVAL;
|
|
goto error_free_full_postfix;
|
|
}
|
|
} else { /* Single ended */
|
|
if (generic)
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s_%s_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
full_postfix);
|
|
else if (chan->indexed)
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s_%s%d_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
chan->channel,
|
|
full_postfix);
|
|
else
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s_%s_%s",
|
|
iio_direction[chan->output],
|
|
iio_chan_type_name_spec[chan->type],
|
|
full_postfix);
|
|
}
|
|
if (name_format == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_full_postfix;
|
|
}
|
|
dev_attr->attr.name = kasprintf(GFP_KERNEL,
|
|
name_format,
|
|
chan->channel,
|
|
chan->channel2);
|
|
if (dev_attr->attr.name == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_name_format;
|
|
}
|
|
|
|
if (readfunc) {
|
|
dev_attr->attr.mode |= S_IRUGO;
|
|
dev_attr->show = readfunc;
|
|
}
|
|
|
|
if (writefunc) {
|
|
dev_attr->attr.mode |= S_IWUSR;
|
|
dev_attr->store = writefunc;
|
|
}
|
|
kfree(name_format);
|
|
kfree(full_postfix);
|
|
|
|
return 0;
|
|
|
|
error_free_name_format:
|
|
kfree(name_format);
|
|
error_free_full_postfix:
|
|
kfree(full_postfix);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
|
|
{
|
|
kfree(dev_attr->attr.name);
|
|
}
|
|
|
|
int __iio_add_chan_devattr(const char *postfix,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*readfunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
u64 mask,
|
|
bool generic,
|
|
struct device *dev,
|
|
struct list_head *attr_list)
|
|
{
|
|
int ret;
|
|
struct iio_dev_attr *iio_attr, *t;
|
|
|
|
iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
|
|
if (iio_attr == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
ret = __iio_device_attr_init(&iio_attr->dev_attr,
|
|
postfix, chan,
|
|
readfunc, writefunc, generic);
|
|
if (ret)
|
|
goto error_iio_dev_attr_free;
|
|
iio_attr->c = chan;
|
|
iio_attr->address = mask;
|
|
list_for_each_entry(t, attr_list, l)
|
|
if (strcmp(t->dev_attr.attr.name,
|
|
iio_attr->dev_attr.attr.name) == 0) {
|
|
if (!generic)
|
|
dev_err(dev, "tried to double register : %s\n",
|
|
t->dev_attr.attr.name);
|
|
ret = -EBUSY;
|
|
goto error_device_attr_deinit;
|
|
}
|
|
list_add(&iio_attr->l, attr_list);
|
|
|
|
return 0;
|
|
|
|
error_device_attr_deinit:
|
|
__iio_device_attr_deinit(&iio_attr->dev_attr);
|
|
error_iio_dev_attr_free:
|
|
kfree(iio_attr);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan)
|
|
{
|
|
int ret, attrcount = 0;
|
|
int i;
|
|
const struct iio_chan_spec_ext_info *ext_info;
|
|
|
|
if (chan->channel < 0)
|
|
return 0;
|
|
for_each_set_bit(i, &chan->info_mask_separate, sizeof(long)*8) {
|
|
ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
|
|
chan,
|
|
&iio_read_channel_info,
|
|
&iio_write_channel_info,
|
|
i,
|
|
0,
|
|
&indio_dev->dev,
|
|
&indio_dev->channel_attr_list);
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
attrcount++;
|
|
}
|
|
for_each_set_bit(i, &chan->info_mask_shared_by_type, sizeof(long)*8) {
|
|
ret = __iio_add_chan_devattr(iio_chan_info_postfix[i],
|
|
chan,
|
|
&iio_read_channel_info,
|
|
&iio_write_channel_info,
|
|
i,
|
|
1,
|
|
&indio_dev->dev,
|
|
&indio_dev->channel_attr_list);
|
|
if (ret == -EBUSY) {
|
|
ret = 0;
|
|
continue;
|
|
} else if (ret < 0) {
|
|
goto error_ret;
|
|
}
|
|
attrcount++;
|
|
}
|
|
|
|
if (chan->ext_info) {
|
|
unsigned int i = 0;
|
|
for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
|
|
ret = __iio_add_chan_devattr(ext_info->name,
|
|
chan,
|
|
ext_info->read ?
|
|
&iio_read_channel_ext_info : NULL,
|
|
ext_info->write ?
|
|
&iio_write_channel_ext_info : NULL,
|
|
i,
|
|
ext_info->shared,
|
|
&indio_dev->dev,
|
|
&indio_dev->channel_attr_list);
|
|
i++;
|
|
if (ret == -EBUSY && ext_info->shared)
|
|
continue;
|
|
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
attrcount++;
|
|
}
|
|
}
|
|
|
|
ret = attrcount;
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
|
|
struct iio_dev_attr *p)
|
|
{
|
|
kfree(p->dev_attr.attr.name);
|
|
kfree(p);
|
|
}
|
|
|
|
static ssize_t iio_show_dev_name(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
return sprintf(buf, "%s\n", indio_dev->name);
|
|
}
|
|
|
|
static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
|
|
|
|
static int iio_device_register_sysfs(struct iio_dev *indio_dev)
|
|
{
|
|
int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
|
|
struct iio_dev_attr *p, *n;
|
|
struct attribute **attr;
|
|
|
|
/* First count elements in any existing group */
|
|
if (indio_dev->info->attrs) {
|
|
attr = indio_dev->info->attrs->attrs;
|
|
while (*attr++ != NULL)
|
|
attrcount_orig++;
|
|
}
|
|
attrcount = attrcount_orig;
|
|
/*
|
|
* New channel registration method - relies on the fact a group does
|
|
* not need to be initialized if its name is NULL.
|
|
*/
|
|
if (indio_dev->channels)
|
|
for (i = 0; i < indio_dev->num_channels; i++) {
|
|
ret = iio_device_add_channel_sysfs(indio_dev,
|
|
&indio_dev
|
|
->channels[i]);
|
|
if (ret < 0)
|
|
goto error_clear_attrs;
|
|
attrcount += ret;
|
|
}
|
|
|
|
if (indio_dev->name)
|
|
attrcount++;
|
|
|
|
indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
|
|
sizeof(indio_dev->chan_attr_group.attrs[0]),
|
|
GFP_KERNEL);
|
|
if (indio_dev->chan_attr_group.attrs == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_clear_attrs;
|
|
}
|
|
/* Copy across original attributes */
|
|
if (indio_dev->info->attrs)
|
|
memcpy(indio_dev->chan_attr_group.attrs,
|
|
indio_dev->info->attrs->attrs,
|
|
sizeof(indio_dev->chan_attr_group.attrs[0])
|
|
*attrcount_orig);
|
|
attrn = attrcount_orig;
|
|
/* Add all elements from the list. */
|
|
list_for_each_entry(p, &indio_dev->channel_attr_list, l)
|
|
indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
|
|
if (indio_dev->name)
|
|
indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
|
|
|
|
indio_dev->groups[indio_dev->groupcounter++] =
|
|
&indio_dev->chan_attr_group;
|
|
|
|
return 0;
|
|
|
|
error_clear_attrs:
|
|
list_for_each_entry_safe(p, n,
|
|
&indio_dev->channel_attr_list, l) {
|
|
list_del(&p->l);
|
|
iio_device_remove_and_free_read_attr(indio_dev, p);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
|
|
{
|
|
|
|
struct iio_dev_attr *p, *n;
|
|
|
|
list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
|
|
list_del(&p->l);
|
|
iio_device_remove_and_free_read_attr(indio_dev, p);
|
|
}
|
|
kfree(indio_dev->chan_attr_group.attrs);
|
|
}
|
|
|
|
static void iio_dev_release(struct device *device)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(device);
|
|
if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
|
|
iio_device_unregister_trigger_consumer(indio_dev);
|
|
iio_device_unregister_eventset(indio_dev);
|
|
iio_device_unregister_sysfs(indio_dev);
|
|
iio_device_unregister_debugfs(indio_dev);
|
|
|
|
ida_simple_remove(&iio_ida, indio_dev->id);
|
|
kfree(indio_dev);
|
|
}
|
|
|
|
struct device_type iio_device_type = {
|
|
.name = "iio_device",
|
|
.release = iio_dev_release,
|
|
};
|
|
|
|
struct iio_dev *iio_device_alloc(int sizeof_priv)
|
|
{
|
|
struct iio_dev *dev;
|
|
size_t alloc_size;
|
|
|
|
alloc_size = sizeof(struct iio_dev);
|
|
if (sizeof_priv) {
|
|
alloc_size = ALIGN(alloc_size, IIO_ALIGN);
|
|
alloc_size += sizeof_priv;
|
|
}
|
|
/* ensure 32-byte alignment of whole construct ? */
|
|
alloc_size += IIO_ALIGN - 1;
|
|
|
|
dev = kzalloc(alloc_size, GFP_KERNEL);
|
|
|
|
if (dev) {
|
|
dev->dev.groups = dev->groups;
|
|
dev->dev.type = &iio_device_type;
|
|
dev->dev.bus = &iio_bus_type;
|
|
device_initialize(&dev->dev);
|
|
dev_set_drvdata(&dev->dev, (void *)dev);
|
|
mutex_init(&dev->mlock);
|
|
mutex_init(&dev->info_exist_lock);
|
|
INIT_LIST_HEAD(&dev->channel_attr_list);
|
|
|
|
dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
|
|
if (dev->id < 0) {
|
|
/* cannot use a dev_err as the name isn't available */
|
|
printk(KERN_ERR "Failed to get id\n");
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
dev_set_name(&dev->dev, "iio:device%d", dev->id);
|
|
INIT_LIST_HEAD(&dev->buffer_list);
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(iio_device_alloc);
|
|
|
|
void iio_device_free(struct iio_dev *dev)
|
|
{
|
|
if (dev)
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(iio_device_free);
|
|
|
|
static void devm_iio_device_release(struct device *dev, void *res)
|
|
{
|
|
iio_device_free(*(struct iio_dev **)res);
|
|
}
|
|
|
|
static int devm_iio_device_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct iio_dev **r = res;
|
|
if (!r || !*r) {
|
|
WARN_ON(!r || !*r);
|
|
return 0;
|
|
}
|
|
return *r == data;
|
|
}
|
|
|
|
struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
|
|
{
|
|
struct iio_dev **ptr, *iio_dev;
|
|
|
|
ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return NULL;
|
|
|
|
/* use raw alloc_dr for kmalloc caller tracing */
|
|
iio_dev = iio_device_alloc(sizeof_priv);
|
|
if (iio_dev) {
|
|
*ptr = iio_dev;
|
|
devres_add(dev, ptr);
|
|
} else {
|
|
devres_free(ptr);
|
|
}
|
|
|
|
return iio_dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
|
|
|
|
void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = devres_release(dev, devm_iio_device_release,
|
|
devm_iio_device_match, iio_dev);
|
|
WARN_ON(rc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_device_free);
|
|
|
|
/**
|
|
* iio_chrdev_open() - chrdev file open for buffer access and ioctls
|
|
**/
|
|
static int iio_chrdev_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct iio_dev *indio_dev = container_of(inode->i_cdev,
|
|
struct iio_dev, chrdev);
|
|
|
|
if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
|
|
return -EBUSY;
|
|
|
|
iio_device_get(indio_dev);
|
|
|
|
filp->private_data = indio_dev;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iio_chrdev_release() - chrdev file close buffer access and ioctls
|
|
**/
|
|
static int iio_chrdev_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct iio_dev *indio_dev = container_of(inode->i_cdev,
|
|
struct iio_dev, chrdev);
|
|
clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
|
|
iio_device_put(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Somewhat of a cross file organization violation - ioctls here are actually
|
|
* event related */
|
|
static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct iio_dev *indio_dev = filp->private_data;
|
|
int __user *ip = (int __user *)arg;
|
|
int fd;
|
|
|
|
if (cmd == IIO_GET_EVENT_FD_IOCTL) {
|
|
fd = iio_event_getfd(indio_dev);
|
|
if (copy_to_user(ip, &fd, sizeof(fd)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct file_operations iio_buffer_fileops = {
|
|
.read = iio_buffer_read_first_n_outer_addr,
|
|
.release = iio_chrdev_release,
|
|
.open = iio_chrdev_open,
|
|
.poll = iio_buffer_poll_addr,
|
|
.owner = THIS_MODULE,
|
|
.llseek = noop_llseek,
|
|
.unlocked_ioctl = iio_ioctl,
|
|
.compat_ioctl = iio_ioctl,
|
|
};
|
|
|
|
static const struct iio_buffer_setup_ops noop_ring_setup_ops;
|
|
|
|
int iio_device_register(struct iio_dev *indio_dev)
|
|
{
|
|
int ret;
|
|
|
|
/* If the calling driver did not initialize of_node, do it here */
|
|
if (!indio_dev->dev.of_node && indio_dev->dev.parent)
|
|
indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
|
|
|
|
/* configure elements for the chrdev */
|
|
indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
|
|
|
|
ret = iio_device_register_debugfs(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to register debugfs interfaces\n");
|
|
goto error_ret;
|
|
}
|
|
ret = iio_device_register_sysfs(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to register sysfs interfaces\n");
|
|
goto error_unreg_debugfs;
|
|
}
|
|
ret = iio_device_register_eventset(indio_dev);
|
|
if (ret) {
|
|
dev_err(indio_dev->dev.parent,
|
|
"Failed to register event set\n");
|
|
goto error_free_sysfs;
|
|
}
|
|
if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
|
|
iio_device_register_trigger_consumer(indio_dev);
|
|
|
|
if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
|
|
indio_dev->setup_ops == NULL)
|
|
indio_dev->setup_ops = &noop_ring_setup_ops;
|
|
|
|
cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
|
|
indio_dev->chrdev.owner = indio_dev->info->driver_module;
|
|
indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj;
|
|
ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
|
|
if (ret < 0)
|
|
goto error_unreg_eventset;
|
|
|
|
ret = device_add(&indio_dev->dev);
|
|
if (ret < 0)
|
|
goto error_cdev_del;
|
|
|
|
return 0;
|
|
error_cdev_del:
|
|
cdev_del(&indio_dev->chrdev);
|
|
error_unreg_eventset:
|
|
iio_device_unregister_eventset(indio_dev);
|
|
error_free_sysfs:
|
|
iio_device_unregister_sysfs(indio_dev);
|
|
error_unreg_debugfs:
|
|
iio_device_unregister_debugfs(indio_dev);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iio_device_register);
|
|
|
|
void iio_device_unregister(struct iio_dev *indio_dev)
|
|
{
|
|
mutex_lock(&indio_dev->info_exist_lock);
|
|
|
|
device_del(&indio_dev->dev);
|
|
|
|
if (indio_dev->chrdev.dev)
|
|
cdev_del(&indio_dev->chrdev);
|
|
|
|
iio_disable_all_buffers(indio_dev);
|
|
|
|
indio_dev->info = NULL;
|
|
mutex_unlock(&indio_dev->info_exist_lock);
|
|
}
|
|
EXPORT_SYMBOL(iio_device_unregister);
|
|
subsys_initcall(iio_init);
|
|
module_exit(iio_exit);
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
|
|
MODULE_DESCRIPTION("Industrial I/O core");
|
|
MODULE_LICENSE("GPL");
|