| /* 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 "iio.h" |
| #include "iio_core.h" |
| #include "iio_core_trigger.h" |
| #include "chrdev.h" |
| #include "sysfs.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 const char * const iio_data_type_name[] = { |
| [IIO_RAW] = "raw", |
| [IIO_PROCESSED] = "input", |
| }; |
| |
| 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", |
| }; |
| |
| 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_SCALE_SHARED/2] = "scale", |
| [IIO_CHAN_INFO_OFFSET_SHARED/2] = "offset", |
| [IIO_CHAN_INFO_CALIBSCALE_SHARED/2] = "calibscale", |
| [IIO_CHAN_INFO_CALIBBIAS_SHARED/2] = "calibbias", |
| [IIO_CHAN_INFO_PEAK_SHARED/2] = "peak_raw", |
| [IIO_CHAN_INFO_PEAK_SCALE_SHARED/2] = "peak_scale", |
| [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW_SHARED/2] |
| = "quadrature_correction_raw", |
| [IIO_CHAN_INFO_AVERAGE_RAW_SHARED/2] = "mean_raw", |
| }; |
| |
| /** |
| * struct iio_detected_event_list - list element for events that have occurred |
| * @list: linked list header |
| * @ev: the event itself |
| */ |
| struct iio_detected_event_list { |
| struct list_head list; |
| struct iio_event_data ev; |
| }; |
| |
| /** |
| * struct iio_event_interface - chrdev interface for an event line |
| * @dev: device assocated with event interface |
| * @wait: wait queue to allow blocking reads of events |
| * @event_list_lock: mutex to protect the list of detected events |
| * @det_events: list of detected events |
| * @max_events: maximum number of events before new ones are dropped |
| * @current_events: number of events in detected list |
| * @flags: file operations related flags including busy flag. |
| */ |
| struct iio_event_interface { |
| wait_queue_head_t wait; |
| struct mutex event_list_lock; |
| struct list_head det_events; |
| int max_events; |
| int current_events; |
| struct list_head dev_attr_list; |
| unsigned long flags; |
| struct attribute_group group; |
| }; |
| |
| int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp) |
| { |
| struct iio_event_interface *ev_int = indio_dev->event_interface; |
| struct iio_detected_event_list *ev; |
| int ret = 0; |
| |
| /* Does anyone care? */ |
| mutex_lock(&ev_int->event_list_lock); |
| if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { |
| if (ev_int->current_events == ev_int->max_events) { |
| mutex_unlock(&ev_int->event_list_lock); |
| return 0; |
| } |
| ev = kmalloc(sizeof(*ev), GFP_KERNEL); |
| if (ev == NULL) { |
| ret = -ENOMEM; |
| mutex_unlock(&ev_int->event_list_lock); |
| goto error_ret; |
| } |
| ev->ev.id = ev_code; |
| ev->ev.timestamp = timestamp; |
| |
| list_add_tail(&ev->list, &ev_int->det_events); |
| ev_int->current_events++; |
| mutex_unlock(&ev_int->event_list_lock); |
| wake_up_interruptible(&ev_int->wait); |
| } else |
| mutex_unlock(&ev_int->event_list_lock); |
| |
| error_ret: |
| return ret; |
| } |
| EXPORT_SYMBOL(iio_push_event); |
| |
| /* 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 ssize_t iio_event_chrdev_read(struct file *filep, |
| char __user *buf, |
| size_t count, |
| loff_t *f_ps) |
| { |
| struct iio_event_interface *ev_int = filep->private_data; |
| struct iio_detected_event_list *el; |
| int ret; |
| size_t len; |
| |
| mutex_lock(&ev_int->event_list_lock); |
| if (list_empty(&ev_int->det_events)) { |
| if (filep->f_flags & O_NONBLOCK) { |
| ret = -EAGAIN; |
| goto error_mutex_unlock; |
| } |
| mutex_unlock(&ev_int->event_list_lock); |
| /* Blocking on device; waiting for something to be there */ |
| ret = wait_event_interruptible(ev_int->wait, |
| !list_empty(&ev_int |
| ->det_events)); |
| if (ret) |
| goto error_ret; |
| /* Single access device so no one else can get the data */ |
| mutex_lock(&ev_int->event_list_lock); |
| } |
| |
| el = list_first_entry(&ev_int->det_events, |
| struct iio_detected_event_list, |
| list); |
| len = sizeof el->ev; |
| if (copy_to_user(buf, &(el->ev), len)) { |
| ret = -EFAULT; |
| goto error_mutex_unlock; |
| } |
| list_del(&el->list); |
| ev_int->current_events--; |
| mutex_unlock(&ev_int->event_list_lock); |
| kfree(el); |
| |
| return len; |
| |
| error_mutex_unlock: |
| mutex_unlock(&ev_int->event_list_lock); |
| error_ret: |
| |
| return ret; |
| } |
| |
| static int iio_event_chrdev_release(struct inode *inode, struct file *filep) |
| { |
| struct iio_event_interface *ev_int = filep->private_data; |
| struct iio_detected_event_list *el, *t; |
| |
| mutex_lock(&ev_int->event_list_lock); |
| clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); |
| /* |
| * In order to maintain a clean state for reopening, |
| * clear out any awaiting events. The mask will prevent |
| * any new __iio_push_event calls running. |
| */ |
| list_for_each_entry_safe(el, t, &ev_int->det_events, list) { |
| list_del(&el->list); |
| kfree(el); |
| } |
| ev_int->current_events = 0; |
| mutex_unlock(&ev_int->event_list_lock); |
| |
| return 0; |
| } |
| |
| static const struct file_operations iio_event_chrdev_fileops = { |
| .read = iio_event_chrdev_read, |
| .release = iio_event_chrdev_release, |
| .owner = THIS_MODULE, |
| .llseek = noop_llseek, |
| }; |
| |
| static int iio_event_getfd(struct iio_dev *indio_dev) |
| { |
| int fd; |
| |
| if (indio_dev->event_interface == NULL) |
| return -ENODEV; |
| |
| mutex_lock(&indio_dev->event_interface->event_list_lock); |
| if (test_and_set_bit(IIO_BUSY_BIT_POS, |
| &indio_dev->event_interface->flags)) { |
| mutex_unlock(&indio_dev->event_interface->event_list_lock); |
| return -EBUSY; |
| } |
| mutex_unlock(&indio_dev->event_interface->event_list_lock); |
| fd = anon_inode_getfd("iio:event", |
| &iio_event_chrdev_fileops, |
| indio_dev->event_interface, O_RDONLY); |
| if (fd < 0) { |
| mutex_lock(&indio_dev->event_interface->event_list_lock); |
| clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); |
| mutex_unlock(&indio_dev->event_interface->event_list_lock); |
| } |
| return fd; |
| } |
| |
| 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; |
| } |
| |
| 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); |
| } |
| |
| static ssize_t iio_read_channel_info(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int val, val2; |
| int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
| &val, &val2, this_attr->address); |
| |
| if (ret < 0) |
| return ret; |
| |
| if (ret == IIO_VAL_INT) |
| return sprintf(buf, "%d\n", val); |
| else if (ret == IIO_VAL_INT_PLUS_MICRO) { |
| if (val2 < 0) |
| return sprintf(buf, "-%d.%06u\n", val, -val2); |
| else |
| return sprintf(buf, "%d.%06u\n", val, val2); |
| } else if (ret == 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); |
| } else |
| 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_get_drvdata(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) { |
| 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, i, attrcount = 0; |
| |
| if (chan->channel < 0) |
| return 0; |
| |
| ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val], |
| chan, |
| &iio_read_channel_info, |
| (chan->output ? |
| &iio_write_channel_info : NULL), |
| 0, |
| 0, |
| &indio_dev->dev, |
| &indio_dev->channel_attr_list); |
| if (ret) |
| goto error_ret; |
| attrcount++; |
| |
| 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, |
| (1 << i), |
| !(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++; |
| } |
| 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_get_drvdata(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 |
| = kzalloc(sizeof(indio_dev->chan_attr_group.attrs[0])* |
| (attrcount + 1), |
| 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 const char * const iio_ev_type_text[] = { |
| [IIO_EV_TYPE_THRESH] = "thresh", |
| [IIO_EV_TYPE_MAG] = "mag", |
| [IIO_EV_TYPE_ROC] = "roc", |
| [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", |
| [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", |
| }; |
| |
| static const char * const iio_ev_dir_text[] = { |
| [IIO_EV_DIR_EITHER] = "either", |
| [IIO_EV_DIR_RISING] = "rising", |
| [IIO_EV_DIR_FALLING] = "falling" |
| }; |
| |
| static ssize_t iio_ev_state_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int ret; |
| bool val; |
| |
| ret = strtobool(buf, &val); |
| if (ret < 0) |
| return ret; |
| |
| ret = indio_dev->info->write_event_config(indio_dev, |
| this_attr->address, |
| val); |
| return (ret < 0) ? ret : len; |
| } |
| |
| static ssize_t iio_ev_state_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int val = indio_dev->info->read_event_config(indio_dev, |
| this_attr->address); |
| |
| if (val < 0) |
| return val; |
| else |
| return sprintf(buf, "%d\n", val); |
| } |
| |
| static ssize_t iio_ev_value_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int val, ret; |
| |
| ret = indio_dev->info->read_event_value(indio_dev, |
| this_attr->address, &val); |
| if (ret < 0) |
| return ret; |
| |
| return sprintf(buf, "%d\n", val); |
| } |
| |
| static ssize_t iio_ev_value_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| unsigned long val; |
| int ret; |
| |
| ret = strict_strtoul(buf, 10, &val); |
| if (ret) |
| return ret; |
| |
| ret = indio_dev->info->write_event_value(indio_dev, this_attr->address, |
| val); |
| if (ret < 0) |
| return ret; |
| |
| return len; |
| } |
| |
| static int iio_device_add_event_sysfs(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan) |
| { |
| int ret = 0, i, attrcount = 0; |
| u64 mask = 0; |
| char *postfix; |
| if (!chan->event_mask) |
| return 0; |
| |
| for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) { |
| postfix = kasprintf(GFP_KERNEL, "%s_%s_en", |
| iio_ev_type_text[i/IIO_EV_DIR_MAX], |
| iio_ev_dir_text[i%IIO_EV_DIR_MAX]); |
| if (postfix == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| if (chan->modified) |
| mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel, |
| i/IIO_EV_DIR_MAX, |
| i%IIO_EV_DIR_MAX); |
| else if (chan->differential) |
| mask = IIO_EVENT_CODE(chan->type, |
| 0, 0, |
| i%IIO_EV_DIR_MAX, |
| i/IIO_EV_DIR_MAX, |
| 0, |
| chan->channel, |
| chan->channel2); |
| else |
| mask = IIO_UNMOD_EVENT_CODE(chan->type, |
| chan->channel, |
| i/IIO_EV_DIR_MAX, |
| i%IIO_EV_DIR_MAX); |
| |
| ret = __iio_add_chan_devattr(postfix, |
| chan, |
| &iio_ev_state_show, |
| iio_ev_state_store, |
| mask, |
| 0, |
| &indio_dev->dev, |
| &indio_dev->event_interface-> |
| dev_attr_list); |
| kfree(postfix); |
| if (ret) |
| goto error_ret; |
| attrcount++; |
| postfix = kasprintf(GFP_KERNEL, "%s_%s_value", |
| iio_ev_type_text[i/IIO_EV_DIR_MAX], |
| iio_ev_dir_text[i%IIO_EV_DIR_MAX]); |
| if (postfix == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| ret = __iio_add_chan_devattr(postfix, chan, |
| iio_ev_value_show, |
| iio_ev_value_store, |
| mask, |
| 0, |
| &indio_dev->dev, |
| &indio_dev->event_interface-> |
| dev_attr_list); |
| kfree(postfix); |
| if (ret) |
| goto error_ret; |
| attrcount++; |
| } |
| ret = attrcount; |
| error_ret: |
| return ret; |
| } |
| |
| static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev) |
| { |
| struct iio_dev_attr *p, *n; |
| list_for_each_entry_safe(p, n, |
| &indio_dev->event_interface-> |
| dev_attr_list, l) { |
| kfree(p->dev_attr.attr.name); |
| kfree(p); |
| } |
| } |
| |
| static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev) |
| { |
| int j, ret, attrcount = 0; |
| |
| INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list); |
| /* Dynically created from the channels array */ |
| for (j = 0; j < indio_dev->num_channels; j++) { |
| ret = iio_device_add_event_sysfs(indio_dev, |
| &indio_dev->channels[j]); |
| if (ret < 0) |
| goto error_clear_attrs; |
| attrcount += ret; |
| } |
| return attrcount; |
| |
| error_clear_attrs: |
| __iio_remove_event_config_attrs(indio_dev); |
| |
| return ret; |
| } |
| |
| static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev) |
| { |
| int j; |
| |
| for (j = 0; j < indio_dev->num_channels; j++) |
| if (indio_dev->channels[j].event_mask != 0) |
| return true; |
| return false; |
| } |
| |
| static void iio_setup_ev_int(struct iio_event_interface *ev_int) |
| { |
| mutex_init(&ev_int->event_list_lock); |
| /* discussion point - make this variable? */ |
| ev_int->max_events = 10; |
| ev_int->current_events = 0; |
| INIT_LIST_HEAD(&ev_int->det_events); |
| init_waitqueue_head(&ev_int->wait); |
| } |
| |
| static const char *iio_event_group_name = "events"; |
| static int iio_device_register_eventset(struct iio_dev *indio_dev) |
| { |
| struct iio_dev_attr *p; |
| int ret = 0, attrcount_orig = 0, attrcount, attrn; |
| struct attribute **attr; |
| |
| if (!(indio_dev->info->event_attrs || |
| iio_check_for_dynamic_events(indio_dev))) |
| return 0; |
| |
| indio_dev->event_interface = |
| kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL); |
| if (indio_dev->event_interface == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| |
| iio_setup_ev_int(indio_dev->event_interface); |
| if (indio_dev->info->event_attrs != NULL) { |
| attr = indio_dev->info->event_attrs->attrs; |
| while (*attr++ != NULL) |
| attrcount_orig++; |
| } |
| attrcount = attrcount_orig; |
| if (indio_dev->channels) { |
| ret = __iio_add_event_config_attrs(indio_dev); |
| if (ret < 0) |
| goto error_free_setup_event_lines; |
| attrcount += ret; |
| } |
| |
| indio_dev->event_interface->group.name = iio_event_group_name; |
| indio_dev->event_interface->group.attrs = |
| kzalloc(sizeof(indio_dev->event_interface->group.attrs[0]) |
| *(attrcount + 1), |
| GFP_KERNEL); |
| if (indio_dev->event_interface->group.attrs == NULL) { |
| ret = -ENOMEM; |
| goto error_free_setup_event_lines; |
| } |
| if (indio_dev->info->event_attrs) |
| memcpy(indio_dev->event_interface->group.attrs, |
| indio_dev->info->event_attrs->attrs, |
| sizeof(indio_dev->event_interface->group.attrs[0]) |
| *attrcount_orig); |
| attrn = attrcount_orig; |
| /* Add all elements from the list. */ |
| list_for_each_entry(p, |
| &indio_dev->event_interface->dev_attr_list, |
| l) |
| indio_dev->event_interface->group.attrs[attrn++] = |
| &p->dev_attr.attr; |
| indio_dev->groups[indio_dev->groupcounter++] = |
| &indio_dev->event_interface->group; |
| |
| return 0; |
| |
| error_free_setup_event_lines: |
| __iio_remove_event_config_attrs(indio_dev); |
| kfree(indio_dev->event_interface); |
| error_ret: |
| |
| return ret; |
| } |
| |
| static void iio_device_unregister_eventset(struct iio_dev *indio_dev) |
| { |
| if (indio_dev->event_interface == NULL) |
| return; |
| __iio_remove_event_config_attrs(indio_dev); |
| kfree(indio_dev->event_interface->group.attrs); |
| kfree(indio_dev->event_interface); |
| } |
| |
| static void iio_dev_release(struct device *device) |
| { |
| struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev); |
| 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); |
| } |
| |
| static struct device_type iio_dev_type = { |
| .name = "iio_device", |
| .release = iio_dev_release, |
| }; |
| |
| struct iio_dev *iio_allocate_device(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); |
| |
| 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_allocate_device); |
| |
| void iio_free_device(struct iio_dev *dev) |
| { |
| if (dev) { |
| ida_simple_remove(&iio_ida, dev->id); |
| kfree(dev); |
| } |
| } |
| EXPORT_SYMBOL(iio_free_device); |
| |
| /** |
| * 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); |
| filp->private_data = indio_dev; |
| |
| return iio_chrdev_buffer_open(indio_dev); |
| } |
| |
| /** |
| * iio_chrdev_release() - chrdev file close buffer access and ioctls |
| **/ |
| static int iio_chrdev_release(struct inode *inode, struct file *filp) |
| { |
| iio_chrdev_buffer_release(container_of(inode->i_cdev, |
| struct iio_dev, chrdev)); |
| 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, |
| }; |
| |
| 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_sysfs(indio_dev); |
| if (ret) { |
| dev_err(indio_dev->dev.parent, |
| "Failed to register sysfs interfaces\n"); |
| goto error_ret; |
| } |
| 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); |
| |
| 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_ret: |
| return ret; |
| } |
| EXPORT_SYMBOL(iio_device_register); |
| |
| void iio_device_unregister(struct iio_dev *indio_dev) |
| { |
| 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"); |