![Lars-Peter Clausen](/assets/img/avatar_default.png)
Remove the the debugfs entries in iio_device_unregister(). Otherwise the debugfs entries might still be accessible even though the device used in the debugfs callback has already been freed. 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)
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switch (indio_dev->info->write_raw_get_fmt(indio_dev,
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this_attr->c, this_attr->address)) {
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case IIO_VAL_INT_PLUS_MICRO:
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fract_mult = 100000;
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break;
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case IIO_VAL_INT_PLUS_NANO:
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fract_mult = 100000000;
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break;
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|
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);
|
|
|
|
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_device_unregister_debugfs(indio_dev);
|
|
|
|
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");
|