| /* 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); |
| } |
| |
| ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
| uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
| { |
| const struct iio_enum *e = (const struct iio_enum *)priv; |
| unsigned int i; |
| size_t len = 0; |
| |
| if (!e->num_items) |
| return 0; |
| |
| for (i = 0; i < e->num_items; ++i) |
| len += snprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
| |
| /* replace last space with a newline */ |
| buf[len - 1] = '\n'; |
| |
| return len; |
| } |
| EXPORT_SYMBOL_GPL(iio_enum_available_read); |
| |
| ssize_t iio_enum_read(struct iio_dev *indio_dev, |
| uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
| { |
| const struct iio_enum *e = (const struct iio_enum *)priv; |
| int i; |
| |
| if (!e->get) |
| return -EINVAL; |
| |
| i = e->get(indio_dev, chan); |
| if (i < 0) |
| return i; |
| else if (i >= e->num_items) |
| return -EINVAL; |
| |
| return sprintf(buf, "%s\n", e->items[i]); |
| } |
| EXPORT_SYMBOL_GPL(iio_enum_read); |
| |
| ssize_t iio_enum_write(struct iio_dev *indio_dev, |
| uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, |
| size_t len) |
| { |
| const struct iio_enum *e = (const struct iio_enum *)priv; |
| unsigned int i; |
| int ret; |
| |
| if (!e->set) |
| return -EINVAL; |
| |
| for (i = 0; i < e->num_items; i++) { |
| if (sysfs_streq(buf, e->items[i])) |
| break; |
| } |
| |
| if (i == e->num_items) |
| return -EINVAL; |
| |
| ret = e->set(indio_dev, chan, i); |
| return ret ? ret : len; |
| } |
| EXPORT_SYMBOL_GPL(iio_enum_write); |
| |
| 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"); |