/* 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "iio.h" #include "iio_core.h" #include "iio_core_trigger.h" #include "sysfs.h" #include "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 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] = "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", }; 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; } /** * 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; size_t len = sizeof(el->ev); int ret; if (count < len) return -EINVAL; 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); 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) { struct iio_event_interface *ev_int = indio_dev->event_interface; int fd; if (ev_int == NULL) return -ENODEV; mutex_lock(&ev_int->event_list_lock); if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { mutex_unlock(&ev_int->event_list_lock); return -EBUSY; } mutex_unlock(&ev_int->event_list_lock); fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops, ev_int, O_RDONLY); if (fd < 0) { mutex_lock(&ev_int->event_list_lock); clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); mutex_unlock(&ev_int->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 __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, 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, 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++; } 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 = 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 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; if (!indio_dev->info->write_event_value) return -EINVAL; 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 = kcalloc(attrcount + 1, sizeof(indio_dev->event_interface->group.attrs[0]), 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); 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, }; 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 "); MODULE_DESCRIPTION("Industrial I/O core"); MODULE_LICENSE("GPL");