| /* 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. |
| */ |
| |
| #define pr_fmt(fmt) "iio-core: " fmt |
| |
| #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/mutex.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> |
| #include <linux/iio/buffer.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", |
| [IIO_CCT] = "cct", |
| [IIO_PRESSURE] = "pressure", |
| [IIO_HUMIDITYRELATIVE] = "humidityrelative", |
| [IIO_ACTIVITY] = "activity", |
| [IIO_STEPS] = "steps", |
| [IIO_ENERGY] = "energy", |
| [IIO_DISTANCE] = "distance", |
| [IIO_VELOCITY] = "velocity", |
| [IIO_CONCENTRATION] = "concentration", |
| [IIO_RESISTANCE] = "resistance", |
| [IIO_PH] = "ph", |
| [IIO_UVINDEX] = "uvindex", |
| [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", |
| }; |
| |
| static const char * const iio_modifier_names[] = { |
| [IIO_MOD_X] = "x", |
| [IIO_MOD_Y] = "y", |
| [IIO_MOD_Z] = "z", |
| [IIO_MOD_X_AND_Y] = "x&y", |
| [IIO_MOD_X_AND_Z] = "x&z", |
| [IIO_MOD_Y_AND_Z] = "y&z", |
| [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", |
| [IIO_MOD_X_OR_Y] = "x|y", |
| [IIO_MOD_X_OR_Z] = "x|z", |
| [IIO_MOD_Y_OR_Z] = "y|z", |
| [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", |
| [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
| [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
| [IIO_MOD_LIGHT_BOTH] = "both", |
| [IIO_MOD_LIGHT_IR] = "ir", |
| [IIO_MOD_LIGHT_CLEAR] = "clear", |
| [IIO_MOD_LIGHT_RED] = "red", |
| [IIO_MOD_LIGHT_GREEN] = "green", |
| [IIO_MOD_LIGHT_BLUE] = "blue", |
| [IIO_MOD_LIGHT_UV] = "uv", |
| [IIO_MOD_QUATERNION] = "quaternion", |
| [IIO_MOD_TEMP_AMBIENT] = "ambient", |
| [IIO_MOD_TEMP_OBJECT] = "object", |
| [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
| [IIO_MOD_NORTH_TRUE] = "from_north_true", |
| [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", |
| [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", |
| [IIO_MOD_RUNNING] = "running", |
| [IIO_MOD_JOGGING] = "jogging", |
| [IIO_MOD_WALKING] = "walking", |
| [IIO_MOD_STILL] = "still", |
| [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
| [IIO_MOD_I] = "i", |
| [IIO_MOD_Q] = "q", |
| [IIO_MOD_CO2] = "co2", |
| [IIO_MOD_VOC] = "voc", |
| }; |
| |
| /* 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_HIGH_PASS_FILTER_3DB_FREQUENCY] |
| = "filter_high_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", |
| [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
| [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
| [IIO_CHAN_INFO_ENABLE] = "en", |
| [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
| [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
| [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", |
| [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", |
| [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
| [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
| }; |
| |
| /** |
| * iio_find_channel_from_si() - get channel from its scan index |
| * @indio_dev: device |
| * @si: scan index to match |
| */ |
| 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) { |
| pr_err("could not register bus type\n"); |
| goto error_nothing; |
| } |
| |
| ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
| if (ret < 0) { |
| pr_err("failed to allocate char dev region\n"); |
| 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 += scnprintf(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 snprintf(buf, PAGE_SIZE, "%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 const struct iio_mount_matrix iio_mount_idmatrix = { |
| .rotation = { |
| "1", "0", "0", |
| "0", "1", "0", |
| "0", "0", "1" |
| } |
| }; |
| |
| static int iio_setup_mount_idmatrix(const struct device *dev, |
| struct iio_mount_matrix *matrix) |
| { |
| *matrix = iio_mount_idmatrix; |
| dev_info(dev, "mounting matrix not found: using identity...\n"); |
| return 0; |
| } |
| |
| ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, |
| const struct iio_chan_spec *chan, char *buf) |
| { |
| const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) |
| priv)(indio_dev, chan); |
| |
| if (IS_ERR(mtx)) |
| return PTR_ERR(mtx); |
| |
| if (!mtx) |
| mtx = &iio_mount_idmatrix; |
| |
| return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", |
| mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], |
| mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], |
| mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); |
| } |
| EXPORT_SYMBOL_GPL(iio_show_mount_matrix); |
| |
| /** |
| * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from |
| * device-tree "mount-matrix" property |
| * @dev: device the mounting matrix property is assigned to |
| * @propname: device specific mounting matrix property name |
| * @matrix: where to store retrieved matrix |
| * |
| * If device is assigned no mounting matrix property, a default 3x3 identity |
| * matrix will be filled in. |
| * |
| * Return: 0 if success, or a negative error code on failure. |
| */ |
| #ifdef CONFIG_OF |
| int of_iio_read_mount_matrix(const struct device *dev, |
| const char *propname, |
| struct iio_mount_matrix *matrix) |
| { |
| if (dev->of_node) { |
| int err = of_property_read_string_array(dev->of_node, |
| propname, matrix->rotation, |
| ARRAY_SIZE(iio_mount_idmatrix.rotation)); |
| |
| if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation)) |
| return 0; |
| |
| if (err >= 0) |
| /* Invalid number of matrix entries. */ |
| return -EINVAL; |
| |
| if (err != -EINVAL) |
| /* Invalid matrix declaration format. */ |
| return err; |
| } |
| |
| /* Matrix was not declared at all: fallback to identity. */ |
| return iio_setup_mount_idmatrix(dev, matrix); |
| } |
| #else |
| int of_iio_read_mount_matrix(const struct device *dev, |
| const char *propname, |
| struct iio_mount_matrix *matrix) |
| { |
| return iio_setup_mount_idmatrix(dev, matrix); |
| } |
| #endif |
| EXPORT_SYMBOL(of_iio_read_mount_matrix); |
| |
| /** |
| * iio_format_value() - Formats a IIO value into its string representation |
| * @buf: The buffer to which the formatted value gets written |
| * @type: One of the IIO_VAL_... constants. This decides how the val |
| * and val2 parameters are formatted. |
| * @size: Number of IIO value entries contained in vals |
| * @vals: Pointer to the values, exact meaning depends on the |
| * type parameter. |
| * |
| * Return: 0 by default, a negative number on failure or the |
| * total number of characters written for a type that belongs |
| * to the IIO_VAL_... constant. |
| */ |
| ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
| { |
| unsigned long long tmp; |
| bool scale_db = false; |
| |
| switch (type) { |
| case IIO_VAL_INT: |
| return sprintf(buf, "%d\n", vals[0]); |
| case IIO_VAL_INT_PLUS_MICRO_DB: |
| scale_db = true; |
| case IIO_VAL_INT_PLUS_MICRO: |
| if (vals[1] < 0) |
| return sprintf(buf, "-%d.%06u%s\n", abs(vals[0]), |
| -vals[1], scale_db ? " dB" : ""); |
| else |
| return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], |
| scale_db ? " dB" : ""); |
| case IIO_VAL_INT_PLUS_NANO: |
| if (vals[1] < 0) |
| return sprintf(buf, "-%d.%09u\n", abs(vals[0]), |
| -vals[1]); |
| else |
| return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
| case IIO_VAL_FRACTIONAL: |
| tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
| vals[1] = do_div(tmp, 1000000000LL); |
| vals[0] = tmp; |
| return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
| case IIO_VAL_FRACTIONAL_LOG2: |
| tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
| vals[1] = do_div(tmp, 1000000000LL); |
| vals[0] = tmp; |
| return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
| case IIO_VAL_INT_MULTIPLE: |
| { |
| int i; |
| int len = 0; |
| |
| for (i = 0; i < size; ++i) |
| len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", |
| vals[i]); |
| len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); |
| return len; |
| } |
| default: |
| return 0; |
| } |
| } |
| EXPORT_SYMBOL_GPL(iio_format_value); |
| |
| 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 vals[INDIO_MAX_RAW_ELEMENTS]; |
| int ret; |
| int val_len = 2; |
| |
| if (indio_dev->info->read_raw_multi) |
| ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, |
| INDIO_MAX_RAW_ELEMENTS, |
| vals, &val_len, |
| this_attr->address); |
| else |
| ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
| &vals[0], &vals[1], this_attr->address); |
| |
| if (ret < 0) |
| return ret; |
| |
| return iio_format_value(buf, ret, val_len, vals); |
| } |
| |
| /** |
| * iio_str_to_fixpoint() - Parse a fixed-point number from a string |
| * @str: The string to parse |
| * @fract_mult: Multiplier for the first decimal place, should be a power of 10 |
| * @integer: The integer part of the number |
| * @fract: The fractional part of the number |
| * |
| * Returns 0 on success, or a negative error code if the string could not be |
| * parsed. |
| */ |
| int iio_str_to_fixpoint(const char *str, int fract_mult, |
| int *integer, int *fract) |
| { |
| int i = 0, f = 0; |
| bool integer_part = true, negative = false; |
| |
| if (fract_mult == 0) { |
| *fract = 0; |
| |
| return kstrtoint(str, 0, integer); |
| } |
| |
| if (str[0] == '-') { |
| negative = true; |
| str++; |
| } else if (str[0] == '+') { |
| str++; |
| } |
| |
| while (*str) { |
| if ('0' <= *str && *str <= '9') { |
| if (integer_part) { |
| i = i * 10 + *str - '0'; |
| } else { |
| f += fract_mult * (*str - '0'); |
| fract_mult /= 10; |
| } |
| } else if (*str == '\n') { |
| if (*(str + 1) == '\0') |
| break; |
| else |
| return -EINVAL; |
| } else if (*str == '.' && integer_part) { |
| integer_part = false; |
| } else { |
| return -EINVAL; |
| } |
| str++; |
| } |
| |
| if (negative) { |
| if (i) |
| i = -i; |
| else |
| f = -f; |
| } |
| |
| *integer = i; |
| *fract = f; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); |
| |
| 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, fract_mult = 100000; |
| int integer, fract; |
| |
| /* 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: |
| fract_mult = 0; |
| break; |
| case IIO_VAL_INT_PLUS_MICRO: |
| fract_mult = 100000; |
| break; |
| case IIO_VAL_INT_PLUS_NANO: |
| fract_mult = 100000000; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
| if (ret) |
| return ret; |
| |
| 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), |
| enum iio_shared_by shared_by) |
| { |
| int ret = 0; |
| char *name = NULL; |
| char *full_postfix; |
| sysfs_attr_init(&dev_attr->attr); |
| |
| /* Build up postfix of <extend_name>_<modifier>_postfix */ |
| if (chan->modified && (shared_by == IIO_SEPARATE)) { |
| 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 || shared_by != IIO_SEPARATE) |
| full_postfix = kstrdup(postfix, GFP_KERNEL); |
| else |
| full_postfix = kasprintf(GFP_KERNEL, |
| "%s_%s", |
| chan->extend_name, |
| postfix); |
| } |
| if (full_postfix == NULL) |
| return -ENOMEM; |
| |
| if (chan->differential) { /* Differential can not have modifier */ |
| switch (shared_by) { |
| case IIO_SHARED_BY_ALL: |
| name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
| break; |
| case IIO_SHARED_BY_DIR: |
| name = kasprintf(GFP_KERNEL, "%s_%s", |
| iio_direction[chan->output], |
| full_postfix); |
| break; |
| case IIO_SHARED_BY_TYPE: |
| name = 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); |
| break; |
| case IIO_SEPARATE: |
| if (!chan->indexed) { |
| WARN(1, "Differential channels must be indexed\n"); |
| ret = -EINVAL; |
| goto error_free_full_postfix; |
| } |
| name = 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); |
| break; |
| } |
| } else { /* Single ended */ |
| switch (shared_by) { |
| case IIO_SHARED_BY_ALL: |
| name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
| break; |
| case IIO_SHARED_BY_DIR: |
| name = kasprintf(GFP_KERNEL, "%s_%s", |
| iio_direction[chan->output], |
| full_postfix); |
| break; |
| case IIO_SHARED_BY_TYPE: |
| name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
| iio_direction[chan->output], |
| iio_chan_type_name_spec[chan->type], |
| full_postfix); |
| break; |
| |
| case IIO_SEPARATE: |
| if (chan->indexed) |
| name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
| iio_direction[chan->output], |
| iio_chan_type_name_spec[chan->type], |
| chan->channel, |
| full_postfix); |
| else |
| name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
| iio_direction[chan->output], |
| iio_chan_type_name_spec[chan->type], |
| full_postfix); |
| break; |
| } |
| } |
| if (name == NULL) { |
| ret = -ENOMEM; |
| goto error_free_full_postfix; |
| } |
| dev_attr->attr.name = name; |
| |
| if (readfunc) { |
| dev_attr->attr.mode |= S_IRUGO; |
| dev_attr->show = readfunc; |
| } |
| |
| if (writefunc) { |
| dev_attr->attr.mode |= S_IWUSR; |
| dev_attr->store = writefunc; |
| } |
| |
| error_free_full_postfix: |
| kfree(full_postfix); |
| |
| 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, |
| enum iio_shared_by shared_by, |
| 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) |
| return -ENOMEM; |
| ret = __iio_device_attr_init(&iio_attr->dev_attr, |
| postfix, chan, |
| readfunc, writefunc, shared_by); |
| 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 (shared_by == IIO_SEPARATE) |
| 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); |
| return ret; |
| } |
| |
| static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| enum iio_shared_by shared_by, |
| const long *infomask) |
| { |
| int i, ret, attrcount = 0; |
| |
| for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
| if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
| return -EINVAL; |
| ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
| chan, |
| &iio_read_channel_info, |
| &iio_write_channel_info, |
| i, |
| shared_by, |
| &indio_dev->dev, |
| &indio_dev->channel_attr_list); |
| if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
| continue; |
| else if (ret < 0) |
| return ret; |
| attrcount++; |
| } |
| |
| return attrcount; |
| } |
| |
| static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan) |
| { |
| int ret, attrcount = 0; |
| const struct iio_chan_spec_ext_info *ext_info; |
| |
| if (chan->channel < 0) |
| return 0; |
| ret = iio_device_add_info_mask_type(indio_dev, chan, |
| IIO_SEPARATE, |
| &chan->info_mask_separate); |
| if (ret < 0) |
| return ret; |
| attrcount += ret; |
| |
| ret = iio_device_add_info_mask_type(indio_dev, chan, |
| IIO_SHARED_BY_TYPE, |
| &chan->info_mask_shared_by_type); |
| if (ret < 0) |
| return ret; |
| attrcount += ret; |
| |
| ret = iio_device_add_info_mask_type(indio_dev, chan, |
| IIO_SHARED_BY_DIR, |
| &chan->info_mask_shared_by_dir); |
| if (ret < 0) |
| return ret; |
| attrcount += ret; |
| |
| ret = iio_device_add_info_mask_type(indio_dev, chan, |
| IIO_SHARED_BY_ALL, |
| &chan->info_mask_shared_by_all); |
| if (ret < 0) |
| return ret; |
| attrcount += ret; |
| |
| 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) |
| return ret; |
| |
| attrcount++; |
| } |
| } |
| |
| return attrcount; |
| } |
| |
| /** |
| * iio_free_chan_devattr_list() - Free a list of IIO device attributes |
| * @attr_list: List of IIO device attributes |
| * |
| * This function frees the memory allocated for each of the IIO device |
| * attributes in the list. |
| */ |
| void iio_free_chan_devattr_list(struct list_head *attr_list) |
| { |
| struct iio_dev_attr *p, *n; |
| |
| list_for_each_entry_safe(p, n, attr_list, l) { |
| kfree(p->dev_attr.attr.name); |
| list_del(&p->l); |
| 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 snprintf(buf, PAGE_SIZE, "%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; |
| 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 its name is NULL. |
| */ |
| 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: |
| iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
| |
| return ret; |
| } |
| |
| static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
| { |
| |
| iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
| kfree(indio_dev->chan_attr_group.attrs); |
| indio_dev->chan_attr_group.attrs = NULL; |
| } |
| |
| static void iio_dev_release(struct device *device) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(device); |
| if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
| iio_device_unregister_trigger_consumer(indio_dev); |
| iio_device_unregister_eventset(indio_dev); |
| iio_device_unregister_sysfs(indio_dev); |
| |
| iio_buffer_put(indio_dev->buffer); |
| |
| ida_simple_remove(&iio_ida, indio_dev->id); |
| kfree(indio_dev); |
| } |
| |
| struct device_type iio_device_type = { |
| .name = "iio_device", |
| .release = iio_dev_release, |
| }; |
| |
| /** |
| * iio_device_alloc() - allocate an iio_dev from a driver |
| * @sizeof_priv: Space to allocate for private structure. |
| **/ |
| 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_device_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); |
| INIT_LIST_HEAD(&dev->channel_attr_list); |
| |
| 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 */ |
| pr_err("failed to get device id\n"); |
| kfree(dev); |
| return NULL; |
| } |
| dev_set_name(&dev->dev, "iio:device%d", dev->id); |
| INIT_LIST_HEAD(&dev->buffer_list); |
| } |
| |
| return dev; |
| } |
| EXPORT_SYMBOL(iio_device_alloc); |
| |
| /** |
| * iio_device_free() - free an iio_dev from a driver |
| * @dev: the iio_dev associated with the device |
| **/ |
| void iio_device_free(struct iio_dev *dev) |
| { |
| if (dev) |
| put_device(&dev->dev); |
| } |
| EXPORT_SYMBOL(iio_device_free); |
| |
| static void devm_iio_device_release(struct device *dev, void *res) |
| { |
| iio_device_free(*(struct iio_dev **)res); |
| } |
| |
| static int devm_iio_device_match(struct device *dev, void *res, void *data) |
| { |
| struct iio_dev **r = res; |
| if (!r || !*r) { |
| WARN_ON(!r || !*r); |
| return 0; |
| } |
| return *r == data; |
| } |
| |
| /** |
| * devm_iio_device_alloc - Resource-managed iio_device_alloc() |
| * @dev: Device to allocate iio_dev for |
| * @sizeof_priv: Space to allocate for private structure. |
| * |
| * Managed iio_device_alloc. iio_dev allocated with this function is |
| * automatically freed on driver detach. |
| * |
| * If an iio_dev allocated with this function needs to be freed separately, |
| * devm_iio_device_free() must be used. |
| * |
| * RETURNS: |
| * Pointer to allocated iio_dev on success, NULL on failure. |
| */ |
| struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
| { |
| struct iio_dev **ptr, *iio_dev; |
| |
| ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), |
| GFP_KERNEL); |
| if (!ptr) |
| return NULL; |
| |
| iio_dev = iio_device_alloc(sizeof_priv); |
| if (iio_dev) { |
| *ptr = iio_dev; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| } |
| |
| return iio_dev; |
| } |
| EXPORT_SYMBOL_GPL(devm_iio_device_alloc); |
| |
| /** |
| * devm_iio_device_free - Resource-managed iio_device_free() |
| * @dev: Device this iio_dev belongs to |
| * @iio_dev: the iio_dev associated with the device |
| * |
| * Free iio_dev allocated with devm_iio_device_alloc(). |
| */ |
| void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
| { |
| int rc; |
| |
| rc = devres_release(dev, devm_iio_device_release, |
| devm_iio_device_match, iio_dev); |
| WARN_ON(rc); |
| } |
| EXPORT_SYMBOL_GPL(devm_iio_device_free); |
| |
| /** |
| * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
| * @inode: Inode structure for identifying the device in the file system |
| * @filp: File structure for iio device used to keep and later access |
| * private data |
| * |
| * Return: 0 on success or -EBUSY if the device is already opened |
| **/ |
| 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; |
| |
| iio_device_get(indio_dev); |
| |
| filp->private_data = indio_dev; |
| |
| return 0; |
| } |
| |
| /** |
| * iio_chrdev_release() - chrdev file close buffer access and ioctls |
| * @inode: Inode structure pointer for the char device |
| * @filp: File structure pointer for the char device |
| * |
| * Return: 0 for successful release |
| */ |
| 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); |
| iio_device_put(indio_dev); |
| |
| 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 (!indio_dev->info) |
| return -ENODEV; |
| |
| if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
| fd = iio_event_getfd(indio_dev); |
| if (fd < 0) |
| return fd; |
| 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 int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
| { |
| int i, j; |
| const struct iio_chan_spec *channels = indio_dev->channels; |
| |
| if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) |
| return 0; |
| |
| for (i = 0; i < indio_dev->num_channels - 1; i++) { |
| if (channels[i].scan_index < 0) |
| continue; |
| for (j = i + 1; j < indio_dev->num_channels; j++) |
| if (channels[i].scan_index == channels[j].scan_index) { |
| dev_err(&indio_dev->dev, |
| "Duplicate scan index %d\n", |
| channels[i].scan_index); |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
| |
| /** |
| * iio_device_register() - register a device with the IIO subsystem |
| * @indio_dev: Device structure filled by the device driver |
| **/ |
| int iio_device_register(struct iio_dev *indio_dev) |
| { |
| int ret; |
| |
| /* If the calling driver did not initialize of_node, do it here */ |
| if (!indio_dev->dev.of_node && indio_dev->dev.parent) |
| indio_dev->dev.of_node = indio_dev->dev.parent->of_node; |
| |
| ret = iio_check_unique_scan_index(indio_dev); |
| if (ret < 0) |
| return 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"); |
| return ret; |
| } |
| |
| ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); |
| if (ret) { |
| dev_err(indio_dev->dev.parent, |
| "Failed to create buffer sysfs interfaces\n"); |
| goto error_unreg_debugfs; |
| } |
| |
| ret = iio_device_register_sysfs(indio_dev); |
| if (ret) { |
| dev_err(indio_dev->dev.parent, |
| "Failed to register sysfs interfaces\n"); |
| goto error_buffer_free_sysfs; |
| } |
| 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 | INDIO_EVENT_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; |
| |
| cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
| indio_dev->chrdev.owner = indio_dev->info->driver_module; |
| indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
| ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
| if (ret < 0) |
| goto error_unreg_eventset; |
| |
| ret = device_add(&indio_dev->dev); |
| if (ret < 0) |
| goto error_cdev_del; |
| |
| return 0; |
| error_cdev_del: |
| cdev_del(&indio_dev->chrdev); |
| error_unreg_eventset: |
| iio_device_unregister_eventset(indio_dev); |
| error_free_sysfs: |
| iio_device_unregister_sysfs(indio_dev); |
| error_buffer_free_sysfs: |
| iio_buffer_free_sysfs_and_mask(indio_dev); |
| error_unreg_debugfs: |
| iio_device_unregister_debugfs(indio_dev); |
| return ret; |
| } |
| EXPORT_SYMBOL(iio_device_register); |
| |
| /** |
| * iio_device_unregister() - unregister a device from the IIO subsystem |
| * @indio_dev: Device structure representing the device. |
| **/ |
| void iio_device_unregister(struct iio_dev *indio_dev) |
| { |
| mutex_lock(&indio_dev->info_exist_lock); |
| |
| device_del(&indio_dev->dev); |
| |
| if (indio_dev->chrdev.dev) |
| cdev_del(&indio_dev->chrdev); |
| iio_device_unregister_debugfs(indio_dev); |
| |
| iio_disable_all_buffers(indio_dev); |
| |
| indio_dev->info = NULL; |
| |
| iio_device_wakeup_eventset(indio_dev); |
| iio_buffer_wakeup_poll(indio_dev); |
| |
| mutex_unlock(&indio_dev->info_exist_lock); |
| |
| iio_buffer_free_sysfs_and_mask(indio_dev); |
| } |
| EXPORT_SYMBOL(iio_device_unregister); |
| |
| static void devm_iio_device_unreg(struct device *dev, void *res) |
| { |
| iio_device_unregister(*(struct iio_dev **)res); |
| } |
| |
| /** |
| * devm_iio_device_register - Resource-managed iio_device_register() |
| * @dev: Device to allocate iio_dev for |
| * @indio_dev: Device structure filled by the device driver |
| * |
| * Managed iio_device_register. The IIO device registered with this |
| * function is automatically unregistered on driver detach. This function |
| * calls iio_device_register() internally. Refer to that function for more |
| * information. |
| * |
| * If an iio_dev registered with this function needs to be unregistered |
| * separately, devm_iio_device_unregister() must be used. |
| * |
| * RETURNS: |
| * 0 on success, negative error number on failure. |
| */ |
| int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) |
| { |
| struct iio_dev **ptr; |
| int ret; |
| |
| ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return -ENOMEM; |
| |
| *ptr = indio_dev; |
| ret = iio_device_register(indio_dev); |
| if (!ret) |
| devres_add(dev, ptr); |
| else |
| devres_free(ptr); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(devm_iio_device_register); |
| |
| /** |
| * devm_iio_device_unregister - Resource-managed iio_device_unregister() |
| * @dev: Device this iio_dev belongs to |
| * @indio_dev: the iio_dev associated with the device |
| * |
| * Unregister iio_dev registered with devm_iio_device_register(). |
| */ |
| void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) |
| { |
| int rc; |
| |
| rc = devres_release(dev, devm_iio_device_unreg, |
| devm_iio_device_match, indio_dev); |
| WARN_ON(rc); |
| } |
| EXPORT_SYMBOL_GPL(devm_iio_device_unregister); |
| |
| /** |
| * iio_device_claim_direct_mode - Keep device in direct mode |
| * @indio_dev: the iio_dev associated with the device |
| * |
| * If the device is in direct mode it is guaranteed to stay |
| * that way until iio_device_release_direct_mode() is called. |
| * |
| * Use with iio_device_release_direct_mode() |
| * |
| * Returns: 0 on success, -EBUSY on failure |
| */ |
| int iio_device_claim_direct_mode(struct iio_dev *indio_dev) |
| { |
| mutex_lock(&indio_dev->mlock); |
| |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); |
| |
| /** |
| * iio_device_release_direct_mode - releases claim on direct mode |
| * @indio_dev: the iio_dev associated with the device |
| * |
| * Release the claim. Device is no longer guaranteed to stay |
| * in direct mode. |
| * |
| * Use with iio_device_claim_direct_mode() |
| */ |
| void iio_device_release_direct_mode(struct iio_dev *indio_dev) |
| { |
| mutex_unlock(&indio_dev->mlock); |
| } |
| EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); |
| |
| subsys_initcall(iio_init); |
| module_exit(iio_exit); |
| |
| MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
| MODULE_DESCRIPTION("Industrial I/O core"); |
| MODULE_LICENSE("GPL"); |