diff options
Diffstat (limited to 'drivers/iio/industrialio-core.c')
| -rw-r--r-- | drivers/iio/industrialio-core.c | 913 |
1 files changed, 913 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c new file mode 100644 index 000000000000..1ddd8861c71b --- /dev/null +++ b/drivers/iio/industrialio-core.c @@ -0,0 +1,913 @@ +/* The industrial I/O core + * + * Copyright (c) 2008 Jonathan Cameron + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * Based on elements of hwmon and input subsystems. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/idr.h> +#include <linux/kdev_t.h> +#include <linux/err.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/poll.h> +#include <linux/sched.h> +#include <linux/wait.h> +#include <linux/cdev.h> +#include <linux/slab.h> +#include <linux/anon_inodes.h> +#include <linux/debugfs.h> +#include <linux/iio/iio.h> +#include "iio_core.h" +#include "iio_core_trigger.h" +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> + +/* IDA to assign each registered device a unique id*/ +static DEFINE_IDA(iio_ida); + +static dev_t iio_devt; + +#define IIO_DEV_MAX 256 +struct bus_type iio_bus_type = { + .name = "iio", +}; +EXPORT_SYMBOL(iio_bus_type); + +static struct dentry *iio_debugfs_dentry; + +static const char * const iio_direction[] = { + [0] = "in", + [1] = "out", +}; + +static const char * const iio_chan_type_name_spec[] = { + [IIO_VOLTAGE] = "voltage", + [IIO_CURRENT] = "current", + [IIO_POWER] = "power", + [IIO_ACCEL] = "accel", + [IIO_ANGL_VEL] = "anglvel", + [IIO_MAGN] = "magn", + [IIO_LIGHT] = "illuminance", + [IIO_INTENSITY] = "intensity", + [IIO_PROXIMITY] = "proximity", + [IIO_TEMP] = "temp", + [IIO_INCLI] = "incli", + [IIO_ROT] = "rot", + [IIO_ANGL] = "angl", + [IIO_TIMESTAMP] = "timestamp", + [IIO_CAPACITANCE] = "capacitance", + [IIO_ALTVOLTAGE] = "altvoltage", +}; + +static const char * const iio_modifier_names[] = { + [IIO_MOD_X] = "x", + [IIO_MOD_Y] = "y", + [IIO_MOD_Z] = "z", + [IIO_MOD_LIGHT_BOTH] = "both", + [IIO_MOD_LIGHT_IR] = "ir", +}; + +/* relies on pairs of these shared then separate */ +static const char * const iio_chan_info_postfix[] = { + [IIO_CHAN_INFO_RAW] = "raw", + [IIO_CHAN_INFO_PROCESSED] = "input", + [IIO_CHAN_INFO_SCALE] = "scale", + [IIO_CHAN_INFO_OFFSET] = "offset", + [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", + [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", + [IIO_CHAN_INFO_PEAK] = "peak_raw", + [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", + [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", + [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", + [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] + = "filter_low_pass_3db_frequency", + [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", + [IIO_CHAN_INFO_FREQUENCY] = "frequency", + [IIO_CHAN_INFO_PHASE] = "phase", + [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", +}; + +const struct iio_chan_spec +*iio_find_channel_from_si(struct iio_dev *indio_dev, int si) +{ + int i; + + for (i = 0; i < indio_dev->num_channels; i++) + if (indio_dev->channels[i].scan_index == si) + return &indio_dev->channels[i]; + return NULL; +} + +/* This turns up an awful lot */ +ssize_t iio_read_const_attr(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); +} +EXPORT_SYMBOL(iio_read_const_attr); + +static int __init iio_init(void) +{ + int ret; + + /* Register sysfs bus */ + ret = bus_register(&iio_bus_type); + if (ret < 0) { + printk(KERN_ERR + "%s could not register bus type\n", + __FILE__); + goto error_nothing; + } + + ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); + if (ret < 0) { + printk(KERN_ERR "%s: failed to allocate char dev region\n", + __FILE__); + goto error_unregister_bus_type; + } + + iio_debugfs_dentry = debugfs_create_dir("iio", NULL); + + return 0; + +error_unregister_bus_type: + bus_unregister(&iio_bus_type); +error_nothing: + return ret; +} + +static void __exit iio_exit(void) +{ + if (iio_devt) + unregister_chrdev_region(iio_devt, IIO_DEV_MAX); + bus_unregister(&iio_bus_type); + debugfs_remove(iio_debugfs_dentry); +} + +#if defined(CONFIG_DEBUG_FS) +static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct iio_dev *indio_dev = file->private_data; + char buf[20]; + unsigned val = 0; + ssize_t len; + int ret; + + ret = indio_dev->info->debugfs_reg_access(indio_dev, + indio_dev->cached_reg_addr, + 0, &val); + if (ret) + dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); + + len = snprintf(buf, sizeof(buf), "0x%X\n", val); + + return simple_read_from_buffer(userbuf, count, ppos, buf, len); +} + +static ssize_t iio_debugfs_write_reg(struct file *file, + const char __user *userbuf, size_t count, loff_t *ppos) +{ + struct iio_dev *indio_dev = file->private_data; + unsigned reg, val; + char buf[80]; + int ret; + + count = min_t(size_t, count, (sizeof(buf)-1)); + if (copy_from_user(buf, userbuf, count)) + return -EFAULT; + + buf[count] = 0; + + ret = sscanf(buf, "%i %i", ®, &val); + + switch (ret) { + case 1: + indio_dev->cached_reg_addr = reg; + break; + case 2: + indio_dev->cached_reg_addr = reg; + ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, + val, NULL); + if (ret) { + dev_err(indio_dev->dev.parent, "%s: write failed\n", + __func__); + return ret; + } + break; + default: + return -EINVAL; + } + + return count; +} + +static const struct file_operations iio_debugfs_reg_fops = { + .open = simple_open, + .read = iio_debugfs_read_reg, + .write = iio_debugfs_write_reg, +}; + +static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) +{ + debugfs_remove_recursive(indio_dev->debugfs_dentry); +} + +static int iio_device_register_debugfs(struct iio_dev *indio_dev) +{ + struct dentry *d; + + if (indio_dev->info->debugfs_reg_access == NULL) + return 0; + + if (!iio_debugfs_dentry) + return 0; + + indio_dev->debugfs_dentry = + debugfs_create_dir(dev_name(&indio_dev->dev), + iio_debugfs_dentry); + if (indio_dev->debugfs_dentry == NULL) { + dev_warn(indio_dev->dev.parent, + "Failed to create debugfs directory\n"); + return -EFAULT; + } + + d = debugfs_create_file("direct_reg_access", 0644, + indio_dev->debugfs_dentry, + indio_dev, &iio_debugfs_reg_fops); + if (!d) { + iio_device_unregister_debugfs(indio_dev); + return -ENOMEM; + } + + return 0; +} +#else +static int iio_device_register_debugfs(struct iio_dev *indio_dev) +{ + return 0; +} + +static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) +{ +} +#endif /* CONFIG_DEBUG_FS */ + +static ssize_t iio_read_channel_ext_info(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + const struct iio_chan_spec_ext_info *ext_info; + + ext_info = &this_attr->c->ext_info[this_attr->address]; + + return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); +} + +static ssize_t iio_write_channel_ext_info(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + const struct iio_chan_spec_ext_info *ext_info; + + ext_info = &this_attr->c->ext_info[this_attr->address]; + + return ext_info->write(indio_dev, ext_info->private, + this_attr->c, buf, len); +} + +static ssize_t iio_read_channel_info(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int val, val2; + bool scale_db = false; + int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, + &val, &val2, this_attr->address); + + if (ret < 0) + return ret; + + switch (ret) { + case IIO_VAL_INT: + return sprintf(buf, "%d\n", val); + case IIO_VAL_INT_PLUS_MICRO_DB: + scale_db = true; + case IIO_VAL_INT_PLUS_MICRO: + if (val2 < 0) + return sprintf(buf, "-%d.%06u%s\n", val, -val2, + scale_db ? " dB" : ""); + else + return sprintf(buf, "%d.%06u%s\n", val, val2, + scale_db ? " dB" : ""); + case IIO_VAL_INT_PLUS_NANO: + if (val2 < 0) + return sprintf(buf, "-%d.%09u\n", val, -val2); + else + return sprintf(buf, "%d.%09u\n", val, val2); + default: + return 0; + } +} + +static ssize_t iio_write_channel_info(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int ret, integer = 0, fract = 0, fract_mult = 100000; + bool integer_part = true, negative = false; + + /* Assumes decimal - precision based on number of digits */ + if (!indio_dev->info->write_raw) + return -EINVAL; + + 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; + } + + if (buf[0] == '-') { + negative = true; + buf++; + } + + while (*buf) { + if ('0' <= *buf && *buf <= '9') { + if (integer_part) + integer = integer*10 + *buf - '0'; + else { + fract += fract_mult*(*buf - '0'); + if (fract_mult == 1) + break; + fract_mult /= 10; + } + } else if (*buf == '\n') { + if (*(buf + 1) == '\0') + break; + else + return -EINVAL; + } else if (*buf == '.') { + integer_part = false; + } else { + return -EINVAL; + } + buf++; + } + if (negative) { + if (integer) + integer = -integer; + else + fract = -fract; + } + + 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, sizeof(long)*8) { + ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], + chan, + &iio_read_channel_info, + &iio_write_channel_info, + i/2, + !(i%2), + &indio_dev->dev, + &indio_dev->channel_attr_list); + if (ret == -EBUSY && (i%2 == 0)) { + ret = 0; + continue; + } + 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 it is name is NULL. + */ + INIT_LIST_HEAD(&indio_dev->channel_attr_list); + 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); + cdev_del(&indio_dev->chrdev); + 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); +} + +static struct device_type iio_dev_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_dev_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); + + 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); + } + + return dev; +} +EXPORT_SYMBOL(iio_device_alloc); + +void iio_device_free(struct iio_dev *dev) +{ + if (dev) { + ida_simple_remove(&iio_ida, dev->id); + kfree(dev); + } +} +EXPORT_SYMBOL(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; + + 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); + 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; + + /* 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; + + ret = device_add(&indio_dev->dev); + if (ret < 0) + goto error_unreg_eventset; + cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); + indio_dev->chrdev.owner = indio_dev->info->driver_module; + ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); + if (ret < 0) + goto error_del_device; + return 0; + +error_del_device: + device_del(&indio_dev->dev); +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); + indio_dev->info = NULL; + mutex_unlock(&indio_dev->info_exist_lock); + device_unregister(&indio_dev->dev); +} +EXPORT_SYMBOL(iio_device_unregister); +subsys_initcall(iio_init); +module_exit(iio_exit); + +MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); +MODULE_DESCRIPTION("Industrial I/O core"); +MODULE_LICENSE("GPL"); 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