| /* 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/interrupt.h> |
| #include <linux/poll.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/cdev.h> |
| #include <linux/slab.h> |
| #include "iio.h" |
| #include "trigger_consumer.h" |
| |
| #define IIO_ID_PREFIX "device" |
| #define IIO_ID_FORMAT IIO_ID_PREFIX "%d" |
| |
| /* IDR to assign each registered device a unique id*/ |
| static DEFINE_IDA(iio_ida); |
| /* IDR to allocate character device minor numbers */ |
| static DEFINE_IDA(iio_chrdev_ida); |
| /* Lock used to protect both of the above */ |
| static DEFINE_SPINLOCK(iio_ida_lock); |
| |
| dev_t iio_devt; |
| EXPORT_SYMBOL(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_chan_type_name_spec_shared[] = { |
| [IIO_TIMESTAMP] = "timestamp", |
| [IIO_ACCEL] = "accel", |
| [IIO_IN] = "in", |
| [IIO_IN_DIFF] = "in-in", |
| [IIO_GYRO] = "gyro", |
| [IIO_TEMP] = "temp", |
| [IIO_MAGN] = "magn", |
| [IIO_INCLI] = "incli", |
| [IIO_ROT] = "rot", |
| [IIO_INTENSITY] = "intensity", |
| [IIO_LIGHT] = "illuminance", |
| [IIO_ANGL] = "angl", |
| }; |
| |
| static const char * const iio_chan_type_name_spec_complex[] = { |
| [IIO_IN_DIFF] = "in%d-in%d", |
| }; |
| |
| static const char * const iio_modifier_names_light[] = { |
| [IIO_MOD_LIGHT_BOTH] = "both", |
| [IIO_MOD_LIGHT_IR] = "ir", |
| }; |
| |
| static const char * const iio_modifier_names_axial[] = { |
| [IIO_MOD_X] = "x", |
| [IIO_MOD_Y] = "y", |
| [IIO_MOD_Z] = "z", |
| }; |
| |
| /* 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", |
| }; |
| |
| int iio_push_event(struct iio_dev *dev_info, |
| int ev_line, |
| int ev_code, |
| s64 timestamp) |
| { |
| struct iio_event_interface *ev_int |
| = &dev_info->event_interfaces[ev_line]; |
| 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->handler.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.list); |
| 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.list)) { |
| 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.list)); |
| 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.list, |
| 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_handler *hand = iio_cdev_to_handler(inode->i_cdev); |
| struct iio_event_interface *ev_int = hand->private; |
| struct iio_detected_event_list *el, *t; |
| |
| mutex_lock(&ev_int->event_list_lock); |
| clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.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) { |
| list_del(&el->list); |
| kfree(el); |
| } |
| mutex_unlock(&ev_int->event_list_lock); |
| |
| return 0; |
| } |
| |
| static int iio_event_chrdev_open(struct inode *inode, struct file *filep) |
| { |
| struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev); |
| struct iio_event_interface *ev_int = hand->private; |
| |
| mutex_lock(&ev_int->event_list_lock); |
| if (test_and_set_bit(IIO_BUSY_BIT_POS, &hand->flags)) { |
| fops_put(filep->f_op); |
| mutex_unlock(&ev_int->event_list_lock); |
| return -EBUSY; |
| } |
| filep->private_data = hand->private; |
| 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, |
| .open = iio_event_chrdev_open, |
| .owner = THIS_MODULE, |
| .llseek = noop_llseek, |
| }; |
| |
| static void iio_event_dev_release(struct device *dev) |
| { |
| struct iio_event_interface *ev_int |
| = container_of(dev, struct iio_event_interface, dev); |
| cdev_del(&ev_int->handler.chrdev); |
| iio_device_free_chrdev_minor(MINOR(dev->devt)); |
| }; |
| |
| static struct device_type iio_event_type = { |
| .release = iio_event_dev_release, |
| }; |
| |
| int iio_device_get_chrdev_minor(void) |
| { |
| int ret, val; |
| |
| ida_again: |
| if (unlikely(ida_pre_get(&iio_chrdev_ida, GFP_KERNEL) == 0)) |
| return -ENOMEM; |
| spin_lock(&iio_ida_lock); |
| ret = ida_get_new(&iio_chrdev_ida, &val); |
| spin_unlock(&iio_ida_lock); |
| if (unlikely(ret == -EAGAIN)) |
| goto ida_again; |
| else if (unlikely(ret)) |
| return ret; |
| if (val > IIO_DEV_MAX) |
| return -ENOMEM; |
| return val; |
| } |
| |
| void iio_device_free_chrdev_minor(int val) |
| { |
| spin_lock(&iio_ida_lock); |
| ida_remove(&iio_chrdev_ida, val); |
| spin_unlock(&iio_ida_lock); |
| } |
| |
| static int iio_setup_ev_int(struct iio_event_interface *ev_int, |
| const char *name, |
| struct module *owner, |
| struct device *dev) |
| { |
| int ret, minor; |
| |
| ev_int->dev.bus = &iio_bus_type; |
| ev_int->dev.parent = dev; |
| ev_int->dev.type = &iio_event_type; |
| device_initialize(&ev_int->dev); |
| |
| minor = iio_device_get_chrdev_minor(); |
| if (minor < 0) { |
| ret = minor; |
| goto error_device_put; |
| } |
| ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor); |
| dev_set_name(&ev_int->dev, "%s", name); |
| |
| ret = device_add(&ev_int->dev); |
| if (ret) |
| goto error_free_minor; |
| |
| cdev_init(&ev_int->handler.chrdev, &iio_event_chrdev_fileops); |
| ev_int->handler.chrdev.owner = owner; |
| |
| 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.list); |
| init_waitqueue_head(&ev_int->wait); |
| ev_int->handler.private = ev_int; |
| ev_int->handler.flags = 0; |
| |
| ret = cdev_add(&ev_int->handler.chrdev, ev_int->dev.devt, 1); |
| if (ret) |
| goto error_unreg_device; |
| |
| return 0; |
| |
| error_unreg_device: |
| device_unregister(&ev_int->dev); |
| error_free_minor: |
| iio_device_free_chrdev_minor(minor); |
| error_device_put: |
| put_device(&ev_int->dev); |
| |
| return ret; |
| } |
| |
| static void iio_free_ev_int(struct iio_event_interface *ev_int) |
| { |
| device_unregister(&ev_int->dev); |
| put_device(&ev_int->dev); |
| } |
| |
| static int __init iio_dev_init(void) |
| { |
| int err; |
| |
| err = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
| if (err < 0) |
| printk(KERN_ERR "%s: failed to allocate char dev region\n", |
| __FILE__); |
| |
| return err; |
| } |
| |
| static void __exit iio_dev_exit(void) |
| { |
| if (iio_devt) |
| unregister_chrdev_region(iio_devt, IIO_DEV_MAX); |
| } |
| |
| 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 = iio_dev_init(); |
| if (ret < 0) |
| 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) |
| { |
| iio_dev_exit(); |
| 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->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 |
| 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, micro = 0, micro_mult = 100000; |
| bool integer_part = true, negative = false; |
| |
| /* Assumes decimal - precision based on number of digits */ |
| if (!indio_dev->write_raw) |
| return -EINVAL; |
| if (buf[0] == '-') { |
| negative = true; |
| buf++; |
| } |
| while (*buf) { |
| if ('0' <= *buf && *buf <= '9') { |
| if (integer_part) |
| integer = integer*10 + *buf - '0'; |
| else { |
| micro += micro_mult*(*buf - '0'); |
| if (micro_mult == 1) |
| break; |
| micro_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 |
| micro = -micro; |
| } |
| |
| ret = indio_dev->write_raw(indio_dev, this_attr->c, |
| integer, micro, this_attr->address); |
| if (ret) |
| return ret; |
| |
| return len; |
| } |
| |
| static int __iio_build_postfix(struct iio_chan_spec const *chan, |
| bool generic, |
| const char *postfix, |
| char **result) |
| { |
| char *all_post; |
| /* 3 options - generic, extend_name, modified - if generic, extend_name |
| * and modified cannot apply.*/ |
| |
| if (generic || (!chan->modified && !chan->extend_name)) { |
| all_post = kasprintf(GFP_KERNEL, "%s", postfix); |
| } else if (chan->modified) { |
| const char *intermediate; |
| switch (chan->type) { |
| case IIO_INTENSITY: |
| intermediate |
| = iio_modifier_names_light[chan->channel2]; |
| break; |
| case IIO_ACCEL: |
| case IIO_GYRO: |
| case IIO_MAGN: |
| case IIO_INCLI: |
| case IIO_ROT: |
| case IIO_ANGL: |
| intermediate |
| = iio_modifier_names_axial[chan->channel2]; |
| break; |
| default: |
| return -EINVAL; |
| } |
| if (chan->extend_name) |
| all_post = kasprintf(GFP_KERNEL, "%s_%s_%s", |
| intermediate, |
| chan->extend_name, |
| postfix); |
| else |
| all_post = kasprintf(GFP_KERNEL, "%s_%s", |
| intermediate, |
| postfix); |
| } else |
| all_post = kasprintf(GFP_KERNEL, "%s_%s", chan->extend_name, |
| postfix); |
| if (all_post == NULL) |
| return -ENOMEM; |
| *result = all_post; |
| return 0; |
| } |
| |
| 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); |
| ret = __iio_build_postfix(chan, generic, postfix, &full_postfix); |
| if (ret) |
| goto error_ret; |
| |
| /* Special case for types that uses both channel numbers in naming */ |
| if (chan->type == IIO_IN_DIFF && !generic) |
| name_format |
| = kasprintf(GFP_KERNEL, "%s_%s", |
| iio_chan_type_name_spec_complex[chan->type], |
| full_postfix); |
| else if (generic || !chan->indexed) |
| name_format |
| = kasprintf(GFP_KERNEL, "%s_%s", |
| iio_chan_type_name_spec_shared[chan->type], |
| full_postfix); |
| else |
| name_format |
| = kasprintf(GFP_KERNEL, "%s%d_%s", |
| iio_chan_type_name_spec_shared[chan->type], |
| chan->channel, |
| 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; |
| } |
| |
| void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
| { |
| kfree(dev_attr->attr.name); |
| } |
| |
| int __iio_add_chan_devattr(const char *postfix, |
| const char *group, |
| 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), |
| int 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; |
| } |
| |
| ret = sysfs_add_file_to_group(&dev->kobj, |
| &iio_attr->dev_attr.attr, group); |
| if (ret < 0) |
| 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 *dev_info, |
| struct iio_chan_spec const *chan) |
| { |
| int ret, i; |
| |
| |
| if (chan->channel < 0) |
| return 0; |
| if (chan->processed_val) |
| ret = __iio_add_chan_devattr("input", NULL, chan, |
| &iio_read_channel_info, |
| NULL, |
| 0, |
| 0, |
| &dev_info->dev, |
| &dev_info->channel_attr_list); |
| else |
| ret = __iio_add_chan_devattr("raw", NULL, chan, |
| &iio_read_channel_info, |
| NULL, |
| 0, |
| 0, |
| &dev_info->dev, |
| &dev_info->channel_attr_list); |
| if (ret) |
| goto error_ret; |
| |
| for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
| ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
| NULL, chan, |
| &iio_read_channel_info, |
| &iio_write_channel_info, |
| (1 << i), |
| !(i%2), |
| &dev_info->dev, |
| &dev_info->channel_attr_list); |
| if (ret == -EBUSY && (i%2 == 0)) { |
| ret = 0; |
| continue; |
| } |
| if (ret < 0) |
| goto error_ret; |
| } |
| error_ret: |
| return ret; |
| } |
| |
| static void iio_device_remove_and_free_read_attr(struct iio_dev *dev_info, |
| struct iio_dev_attr *p) |
| { |
| sysfs_remove_file_from_group(&dev_info->dev.kobj, |
| &p->dev_attr.attr, NULL); |
| 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 *dev_info) |
| { |
| int i, ret = 0; |
| struct iio_dev_attr *p, *n; |
| |
| if (dev_info->attrs) { |
| ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs); |
| if (ret) { |
| dev_err(dev_info->dev.parent, |
| "Failed to register sysfs hooks\n"); |
| goto error_ret; |
| } |
| } |
| |
| /* |
| * 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(&dev_info->channel_attr_list); |
| if (dev_info->channels) |
| for (i = 0; i < dev_info->num_channels; i++) { |
| ret = iio_device_add_channel_sysfs(dev_info, |
| &dev_info |
| ->channels[i]); |
| if (ret < 0) |
| goto error_clear_attrs; |
| } |
| if (dev_info->name) { |
| ret = sysfs_add_file_to_group(&dev_info->dev.kobj, |
| &dev_attr_name.attr, |
| NULL); |
| if (ret) |
| goto error_clear_attrs; |
| } |
| return 0; |
| |
| error_clear_attrs: |
| list_for_each_entry_safe(p, n, |
| &dev_info->channel_attr_list, l) { |
| list_del(&p->l); |
| iio_device_remove_and_free_read_attr(dev_info, p); |
| } |
| if (dev_info->attrs) |
| sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); |
| error_ret: |
| return ret; |
| |
| } |
| |
| static void iio_device_unregister_sysfs(struct iio_dev *dev_info) |
| { |
| |
| struct iio_dev_attr *p, *n; |
| if (dev_info->name) |
| sysfs_remove_file_from_group(&dev_info->dev.kobj, |
| &dev_attr_name.attr, |
| NULL); |
| list_for_each_entry_safe(p, n, &dev_info->channel_attr_list, l) { |
| list_del(&p->l); |
| iio_device_remove_and_free_read_attr(dev_info, p); |
| } |
| |
| if (dev_info->attrs) |
| sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); |
| } |
| |
| /* Return a negative errno on failure */ |
| int iio_get_new_ida_val(struct ida *this_ida) |
| { |
| int ret; |
| int val; |
| |
| ida_again: |
| if (unlikely(ida_pre_get(this_ida, GFP_KERNEL) == 0)) |
| return -ENOMEM; |
| |
| spin_lock(&iio_ida_lock); |
| ret = ida_get_new(this_ida, &val); |
| spin_unlock(&iio_ida_lock); |
| if (unlikely(ret == -EAGAIN)) |
| goto ida_again; |
| else if (unlikely(ret)) |
| return ret; |
| |
| return val; |
| } |
| EXPORT_SYMBOL(iio_get_new_ida_val); |
| |
| void iio_free_ida_val(struct ida *this_ida, int id) |
| { |
| spin_lock(&iio_ida_lock); |
| ida_remove(this_ida, id); |
| spin_unlock(&iio_ida_lock); |
| } |
| EXPORT_SYMBOL(iio_free_ida_val); |
| |
| static int iio_device_register_id(struct iio_dev *dev_info, |
| struct ida *this_ida) |
| { |
| dev_info->id = iio_get_new_ida_val(&iio_ida); |
| if (dev_info->id < 0) |
| return dev_info->id; |
| return 0; |
| } |
| |
| static void iio_device_unregister_id(struct iio_dev *dev_info) |
| { |
| iio_free_ida_val(&iio_ida, dev_info->id); |
| } |
| |
| static const char * const iio_ev_type_text[] = { |
| [IIO_EV_TYPE_THRESH] = "thresh", |
| [IIO_EV_TYPE_MAG] = "mag", |
| [IIO_EV_TYPE_ROC] = "roc" |
| }; |
| |
| 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; |
| unsigned long val; |
| ret = strict_strtoul(buf, 10, &val); |
| if (ret || val < 0 || val > 1) |
| return -EINVAL; |
| |
| ret = indio_dev->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->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->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->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 *dev_info, |
| struct iio_chan_spec const *chan) |
| { |
| |
| int ret = 0, i, mask; |
| 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_TYPE_MAX], |
| iio_ev_dir_text[i%IIO_EV_TYPE_MAX]); |
| if (postfix == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| switch (chan->type) { |
| /* Switch this to a table at some point */ |
| case IIO_IN: |
| mask = IIO_UNMOD_EVENT_CODE(chan->type, chan->channel, |
| i/IIO_EV_TYPE_MAX, |
| i%IIO_EV_TYPE_MAX); |
| break; |
| case IIO_ACCEL: |
| mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel, |
| i/IIO_EV_TYPE_MAX, |
| i%IIO_EV_TYPE_MAX); |
| break; |
| case IIO_IN_DIFF: |
| mask = IIO_MOD_EVENT_CODE(chan->type, chan->channel, |
| chan->channel2, |
| i/IIO_EV_TYPE_MAX, |
| i%IIO_EV_TYPE_MAX); |
| break; |
| default: |
| printk(KERN_INFO "currently unhandled type of event\n"); |
| } |
| ret = __iio_add_chan_devattr(postfix, |
| NULL, |
| chan, |
| &iio_ev_state_show, |
| iio_ev_state_store, |
| mask, |
| /*HACK. - limits us to one |
| event interface - fix by |
| extending the bitmask - but |
| how far*/ |
| 0, |
| &dev_info->event_interfaces[0] |
| .dev, |
| &dev_info->event_interfaces[0]. |
| dev_attr_list); |
| kfree(postfix); |
| if (ret) |
| goto error_ret; |
| |
| postfix = kasprintf(GFP_KERNEL, "%s_%s_value", |
| iio_ev_type_text[i/IIO_EV_TYPE_MAX], |
| iio_ev_dir_text[i%IIO_EV_TYPE_MAX]); |
| if (postfix == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| ret = __iio_add_chan_devattr(postfix, NULL, chan, |
| iio_ev_value_show, |
| iio_ev_value_store, |
| mask, |
| 0, |
| &dev_info->event_interfaces[0] |
| .dev, |
| &dev_info->event_interfaces[0] |
| .dev_attr_list); |
| kfree(postfix); |
| if (ret) |
| goto error_ret; |
| |
| } |
| |
| error_ret: |
| return ret; |
| } |
| |
| static inline void __iio_remove_all_event_sysfs(struct iio_dev *dev_info, |
| const char *groupname, |
| int num) |
| { |
| struct iio_dev_attr *p, *n; |
| list_for_each_entry_safe(p, n, |
| &dev_info->event_interfaces[num]. |
| dev_attr_list, l) { |
| sysfs_remove_file_from_group(&dev_info |
| ->event_interfaces[num].dev.kobj, |
| &p->dev_attr.attr, |
| groupname); |
| kfree(p->dev_attr.attr.name); |
| kfree(p); |
| } |
| } |
| |
| static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i) |
| { |
| int j; |
| int ret; |
| struct attribute **attrp, **attrq; |
| |
| if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) { |
| attrp = dev_info->event_conf_attrs[i].attrs; |
| while (*attrp) { |
| ret = sysfs_add_file_to_group(&dev_info |
| ->event_interfaces[0] |
| .dev.kobj, |
| *attrp, |
| NULL); |
| if (ret) |
| goto error_ret; |
| attrp++; |
| } |
| } |
| INIT_LIST_HEAD(&dev_info->event_interfaces[0].dev_attr_list); |
| /* Dynically created from the channels array */ |
| if (dev_info->channels) { |
| for (j = 0; j < dev_info->num_channels; j++) { |
| ret = iio_device_add_event_sysfs(dev_info, |
| &dev_info |
| ->channels[j]); |
| if (ret) |
| goto error_clear_attrs; |
| } |
| } |
| return 0; |
| |
| error_clear_attrs: |
| __iio_remove_all_event_sysfs(dev_info, |
| NULL, |
| i); |
| error_ret: |
| attrq = dev_info->event_conf_attrs[i].attrs; |
| while (attrq != attrp) { |
| sysfs_remove_file_from_group(&dev_info |
| ->event_interfaces[0] |
| .dev.kobj, |
| *attrq, |
| NULL); |
| attrq++; |
| } |
| |
| return ret; |
| } |
| |
| static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info, |
| int i) |
| { |
| struct attribute **attrq; |
| __iio_remove_all_event_sysfs(dev_info, |
| NULL, |
| i); |
| if (dev_info->event_conf_attrs |
| && dev_info->event_conf_attrs[i].attrs) { |
| attrq = dev_info->event_conf_attrs[i].attrs; |
| while (*attrq) { |
| sysfs_remove_file_from_group(&dev_info |
| ->event_interfaces[0] |
| .dev.kobj, |
| *attrq, |
| NULL); |
| attrq++; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int iio_device_register_eventset(struct iio_dev *dev_info) |
| { |
| int ret = 0, i, j; |
| |
| if (dev_info->num_interrupt_lines == 0) |
| return 0; |
| |
| dev_info->event_interfaces = |
| kzalloc(sizeof(struct iio_event_interface) |
| *dev_info->num_interrupt_lines, |
| GFP_KERNEL); |
| if (dev_info->event_interfaces == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) { |
| dev_info->event_interfaces[i].owner = dev_info->driver_module; |
| |
| snprintf(dev_info->event_interfaces[i]._name, 20, |
| "%s:event%d", |
| dev_name(&dev_info->dev), |
| i); |
| |
| ret = iio_setup_ev_int(&dev_info->event_interfaces[i], |
| (const char *)(dev_info |
| ->event_interfaces[i] |
| ._name), |
| dev_info->driver_module, |
| &dev_info->dev); |
| if (ret) { |
| dev_err(&dev_info->dev, |
| "Could not get chrdev interface\n"); |
| goto error_free_setup_ev_ints; |
| } |
| |
| dev_set_drvdata(&dev_info->event_interfaces[i].dev, |
| (void *)dev_info); |
| |
| if (dev_info->event_attrs != NULL) |
| ret = sysfs_create_group(&dev_info |
| ->event_interfaces[i] |
| .dev.kobj, |
| &dev_info->event_attrs[i]); |
| |
| if (ret) { |
| dev_err(&dev_info->dev, |
| "Failed to register sysfs for event attrs"); |
| goto error_remove_sysfs_interfaces; |
| } |
| } |
| |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) { |
| ret = __iio_add_event_config_attrs(dev_info, i); |
| if (ret) |
| goto error_unregister_config_attrs; |
| } |
| |
| return 0; |
| |
| error_unregister_config_attrs: |
| for (j = 0; j < i; j++) |
| __iio_remove_event_config_attrs(dev_info, i); |
| i = dev_info->num_interrupt_lines - 1; |
| error_remove_sysfs_interfaces: |
| for (j = 0; j < i; j++) |
| if (dev_info->event_attrs != NULL) |
| sysfs_remove_group(&dev_info |
| ->event_interfaces[j].dev.kobj, |
| &dev_info->event_attrs[j]); |
| error_free_setup_ev_ints: |
| for (j = 0; j < i; j++) |
| iio_free_ev_int(&dev_info->event_interfaces[j]); |
| kfree(dev_info->event_interfaces); |
| error_ret: |
| |
| return ret; |
| } |
| |
| static void iio_device_unregister_eventset(struct iio_dev *dev_info) |
| { |
| int i; |
| |
| if (dev_info->num_interrupt_lines == 0) |
| return; |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) { |
| __iio_remove_event_config_attrs(dev_info, i); |
| if (dev_info->event_attrs != NULL) |
| sysfs_remove_group(&dev_info |
| ->event_interfaces[i].dev.kobj, |
| &dev_info->event_attrs[i]); |
| } |
| |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) |
| iio_free_ev_int(&dev_info->event_interfaces[i]); |
| kfree(dev_info->event_interfaces); |
| } |
| |
| static void iio_dev_release(struct device *device) |
| { |
| struct iio_dev *dev = to_iio_dev(device); |
| |
| iio_put(); |
| kfree(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.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); |
| iio_get(); |
| } |
| |
| return dev; |
| } |
| EXPORT_SYMBOL(iio_allocate_device); |
| |
| void iio_free_device(struct iio_dev *dev) |
| { |
| if (dev) |
| iio_put_device(dev); |
| } |
| EXPORT_SYMBOL(iio_free_device); |
| |
| int iio_device_register(struct iio_dev *dev_info) |
| { |
| int ret; |
| |
| ret = iio_device_register_id(dev_info, &iio_ida); |
| if (ret) { |
| dev_err(&dev_info->dev, "Failed to get id\n"); |
| goto error_ret; |
| } |
| dev_set_name(&dev_info->dev, "device%d", dev_info->id); |
| |
| ret = device_add(&dev_info->dev); |
| if (ret) |
| goto error_free_ida; |
| ret = iio_device_register_sysfs(dev_info); |
| if (ret) { |
| dev_err(dev_info->dev.parent, |
| "Failed to register sysfs interfaces\n"); |
| goto error_del_device; |
| } |
| ret = iio_device_register_eventset(dev_info); |
| if (ret) { |
| dev_err(dev_info->dev.parent, |
| "Failed to register event set\n"); |
| goto error_free_sysfs; |
| } |
| if (dev_info->modes & INDIO_RING_TRIGGERED) |
| iio_device_register_trigger_consumer(dev_info); |
| |
| return 0; |
| |
| error_free_sysfs: |
| iio_device_unregister_sysfs(dev_info); |
| error_del_device: |
| device_del(&dev_info->dev); |
| error_free_ida: |
| iio_device_unregister_id(dev_info); |
| error_ret: |
| return ret; |
| } |
| EXPORT_SYMBOL(iio_device_register); |
| |
| void iio_device_unregister(struct iio_dev *dev_info) |
| { |
| if (dev_info->modes & INDIO_RING_TRIGGERED) |
| iio_device_unregister_trigger_consumer(dev_info); |
| iio_device_unregister_eventset(dev_info); |
| iio_device_unregister_sysfs(dev_info); |
| iio_device_unregister_id(dev_info); |
| device_unregister(&dev_info->dev); |
| } |
| EXPORT_SYMBOL(iio_device_unregister); |
| |
| void iio_put(void) |
| { |
| module_put(THIS_MODULE); |
| } |
| |
| void iio_get(void) |
| { |
| __module_get(THIS_MODULE); |
| } |
| |
| 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"); |