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drivers/iio/industrialio-core.c
45 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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/* The industrial I/O core * * Copyright (c) 2008 Jonathan Cameron * |
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* Based on elements of hwmon and input subsystems. */ |
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#define pr_fmt(fmt) "iio-core: " fmt |
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#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> |
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#include <linux/poll.h> |
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#include <linux/property.h> |
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#include <linux/sched.h> |
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#include <linux/wait.h> |
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#include <linux/cdev.h> |
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#include <linux/slab.h> |
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#include <linux/anon_inodes.h> |
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#include <linux/debugfs.h> |
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#include <linux/mutex.h> |
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#include <linux/iio/iio.h> |
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#include "iio_core.h" |
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#include "iio_core_trigger.h" |
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#include <linux/iio/sysfs.h> #include <linux/iio/events.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/buffer_impl.h> |
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/* IDA to assign each registered device a unique id */ |
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static DEFINE_IDA(iio_ida); |
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static dev_t iio_devt; |
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#define IIO_DEV_MAX 256 |
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struct bus_type iio_bus_type = { |
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.name = "iio", |
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}; |
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EXPORT_SYMBOL(iio_bus_type); |
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static struct dentry *iio_debugfs_dentry; |
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static const char * const iio_direction[] = { [0] = "in", [1] = "out", }; |
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static const char * const iio_chan_type_name_spec[] = { |
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[IIO_VOLTAGE] = "voltage", |
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[IIO_CURRENT] = "current", [IIO_POWER] = "power", |
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[IIO_ACCEL] = "accel", |
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[IIO_ANGL_VEL] = "anglvel", |
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[IIO_MAGN] = "magn", |
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[IIO_LIGHT] = "illuminance", [IIO_INTENSITY] = "intensity", |
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[IIO_PROXIMITY] = "proximity", |
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[IIO_TEMP] = "temp", |
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[IIO_INCLI] = "incli", [IIO_ROT] = "rot", |
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[IIO_ANGL] = "angl", |
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[IIO_TIMESTAMP] = "timestamp", |
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[IIO_CAPACITANCE] = "capacitance", |
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[IIO_ALTVOLTAGE] = "altvoltage", |
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[IIO_CCT] = "cct", |
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[IIO_PRESSURE] = "pressure", |
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[IIO_HUMIDITYRELATIVE] = "humidityrelative", |
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[IIO_ACTIVITY] = "activity", |
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[IIO_STEPS] = "steps", |
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[IIO_ENERGY] = "energy", |
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[IIO_DISTANCE] = "distance", |
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[IIO_VELOCITY] = "velocity", |
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[IIO_CONCENTRATION] = "concentration", |
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[IIO_RESISTANCE] = "resistance", |
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[IIO_PH] = "ph", |
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[IIO_UVINDEX] = "uvindex", |
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[IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", |
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[IIO_COUNT] = "count", [IIO_INDEX] = "index", |
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[IIO_GRAVITY] = "gravity", |
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[IIO_POSITIONRELATIVE] = "positionrelative", |
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[IIO_PHASE] = "phase", |
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[IIO_MASSCONCENTRATION] = "massconcentration", |
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}; |
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static const char * const iio_modifier_names[] = { |
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[IIO_MOD_X] = "x", [IIO_MOD_Y] = "y", [IIO_MOD_Z] = "z", |
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[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", |
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[IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
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[IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
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[IIO_MOD_LIGHT_BOTH] = "both", [IIO_MOD_LIGHT_IR] = "ir", |
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[IIO_MOD_LIGHT_CLEAR] = "clear", [IIO_MOD_LIGHT_RED] = "red", [IIO_MOD_LIGHT_GREEN] = "green", [IIO_MOD_LIGHT_BLUE] = "blue", |
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[IIO_MOD_LIGHT_UV] = "uv", |
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[IIO_MOD_LIGHT_DUV] = "duv", |
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[IIO_MOD_QUATERNION] = "quaternion", |
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[IIO_MOD_TEMP_AMBIENT] = "ambient", [IIO_MOD_TEMP_OBJECT] = "object", |
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[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", |
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[IIO_MOD_RUNNING] = "running", [IIO_MOD_JOGGING] = "jogging", [IIO_MOD_WALKING] = "walking", [IIO_MOD_STILL] = "still", |
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[IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
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[IIO_MOD_I] = "i", [IIO_MOD_Q] = "q", |
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[IIO_MOD_CO2] = "co2", [IIO_MOD_VOC] = "voc", |
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[IIO_MOD_PM1] = "pm1", [IIO_MOD_PM2P5] = "pm2p5", [IIO_MOD_PM4] = "pm4", [IIO_MOD_PM10] = "pm10", |
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}; /* relies on pairs of these shared then separate */ static const char * const iio_chan_info_postfix[] = { |
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[IIO_CHAN_INFO_RAW] = "raw", [IIO_CHAN_INFO_PROCESSED] = "input", |
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[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", |
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[IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] = "filter_low_pass_3db_frequency", |
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[IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] = "filter_high_pass_3db_frequency", |
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[IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
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[IIO_CHAN_INFO_FREQUENCY] = "frequency", [IIO_CHAN_INFO_PHASE] = "phase", |
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[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
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[IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
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[IIO_CHAN_INFO_INT_TIME] = "integration_time", |
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[IIO_CHAN_INFO_ENABLE] = "en", |
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[IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
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[IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
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[IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", |
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[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
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[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
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}; |
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/** * iio_find_channel_from_si() - get channel from its scan index * @indio_dev: device * @si: scan index to match */ |
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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; } |
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/* 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 ", to_iio_const_attr(attr)->string); } EXPORT_SYMBOL(iio_read_const_attr); |
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static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) { int ret; const struct iio_event_interface *ev_int = indio_dev->event_interface; ret = mutex_lock_interruptible(&indio_dev->mlock); if (ret) return ret; if ((ev_int && iio_event_enabled(ev_int)) || iio_buffer_enabled(indio_dev)) { mutex_unlock(&indio_dev->mlock); return -EBUSY; } indio_dev->clock_id = clock_id; mutex_unlock(&indio_dev->mlock); return 0; } /** * iio_get_time_ns() - utility function to get a time stamp for events etc * @indio_dev: device */ s64 iio_get_time_ns(const struct iio_dev *indio_dev) { |
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struct timespec64 tp; |
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switch (iio_device_get_clock(indio_dev)) { case CLOCK_REALTIME: |
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return ktime_get_real_ns(); |
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case CLOCK_MONOTONIC: |
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return ktime_get_ns(); |
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case CLOCK_MONOTONIC_RAW: |
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return ktime_get_raw_ns(); |
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case CLOCK_REALTIME_COARSE: |
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return ktime_to_ns(ktime_get_coarse_real()); |
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case CLOCK_MONOTONIC_COARSE: |
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ktime_get_coarse_ts64(&tp); return timespec64_to_ns(&tp); |
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case CLOCK_BOOTTIME: |
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return ktime_get_boottime_ns(); |
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case CLOCK_TAI: |
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return ktime_get_clocktai_ns(); |
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default: BUG(); } |
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} EXPORT_SYMBOL(iio_get_time_ns); /** * iio_get_time_res() - utility function to get time stamp clock resolution in * nano seconds. * @indio_dev: device */ unsigned int iio_get_time_res(const struct iio_dev *indio_dev) { switch (iio_device_get_clock(indio_dev)) { case CLOCK_REALTIME: case CLOCK_MONOTONIC: case CLOCK_MONOTONIC_RAW: case CLOCK_BOOTTIME: case CLOCK_TAI: return hrtimer_resolution; case CLOCK_REALTIME_COARSE: case CLOCK_MONOTONIC_COARSE: return LOW_RES_NSEC; default: BUG(); } } EXPORT_SYMBOL(iio_get_time_res); |
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static int __init iio_init(void) { int ret; |
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/* Register sysfs bus */ ret = bus_register(&iio_bus_type); |
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if (ret < 0) { |
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pr_err("could not register bus type "); |
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goto error_nothing; } |
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ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); if (ret < 0) { |
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pr_err("failed to allocate char dev region "); |
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goto error_unregister_bus_type; |
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} |
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iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
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return 0; |
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error_unregister_bus_type: bus_unregister(&iio_bus_type); |
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error_nothing: return ret; } static void __exit iio_exit(void) { |
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if (iio_devt) unregister_chrdev_region(iio_devt, IIO_DEV_MAX); |
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bus_unregister(&iio_bus_type); |
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debugfs_remove(iio_debugfs_dentry); } #if defined(CONFIG_DEBUG_FS) |
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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); |
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if (ret) { |
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dev_err(indio_dev->dev.parent, "%s: read failed ", __func__); |
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return ret; } |
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len = snprintf(buf, sizeof(buf), "0x%X ", 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 ", __func__); return ret; } break; default: return -EINVAL; } return count; } static const struct file_operations iio_debugfs_reg_fops = { |
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.open = simple_open, |
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.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); |
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} |
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static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
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{ |
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if (indio_dev->info->debugfs_reg_access == NULL) |
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return; |
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if (!iio_debugfs_dentry) |
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return; |
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indio_dev->debugfs_dentry = debugfs_create_dir(dev_name(&indio_dev->dev), iio_debugfs_dentry); |
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debugfs_create_file("direct_reg_access", 0644, indio_dev->debugfs_dentry, indio_dev, &iio_debugfs_reg_fops); |
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} #else |
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static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
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{ |
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} static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) { } #endif /* CONFIG_DEBUG_FS */ |
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static ssize_t iio_read_channel_ext_info(struct device *dev, struct device_attribute *attr, char *buf) { |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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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]; |
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return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
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} static ssize_t iio_write_channel_ext_info(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { |
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struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
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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]; |
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return ext_info->write(indio_dev, ext_info->private, this_attr->c, buf, len); |
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} |
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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) |
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len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
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/* replace last space with a newline */ buf[len - 1] = ' '; 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; |
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return snprintf(buf, PAGE_SIZE, "%s ", e->items[i]); |
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} 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; |
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int ret; if (!e->set) return -EINVAL; |
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ret = __sysfs_match_string(e->items, e->num_items, buf); if (ret < 0) return ret; |
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ret = e->set(indio_dev, chan, ret); |
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|
465 466 467 |
return ret ? ret : len; } EXPORT_SYMBOL_GPL(iio_enum_write); |
dfc57732a
|
468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 |
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... "); 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 ", 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); /** |
fb1589710
|
506 507 |
* iio_read_mount_matrix() - retrieve iio device mounting matrix from * device "mount-matrix" property |
dfc57732a
|
508 509 510 511 512 513 514 515 516 |
* @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. */ |
fb1589710
|
517 518 |
int iio_read_mount_matrix(struct device *dev, const char *propname, struct iio_mount_matrix *matrix) |
dfc57732a
|
519 |
{ |
fb1589710
|
520 521 |
size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation); int err; |
dfc57732a
|
522 |
|
fb1589710
|
523 524 525 526 |
err = device_property_read_string_array(dev, propname, matrix->rotation, len); if (err == len) return 0; |
dfc57732a
|
527 |
|
fb1589710
|
528 529 530 |
if (err >= 0) /* Invalid number of matrix entries. */ return -EINVAL; |
dfc57732a
|
531 |
|
fb1589710
|
532 533 534 |
if (err != -EINVAL) /* Invalid matrix declaration format. */ return err; |
dfc57732a
|
535 536 537 538 |
/* Matrix was not declared at all: fallback to identity. */ return iio_setup_mount_idmatrix(dev, matrix); } |
fb1589710
|
539 |
EXPORT_SYMBOL(iio_read_mount_matrix); |
dfc57732a
|
540 |
|
512396000
|
541 542 |
static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type, int size, const int *vals) |
847ec80bb
|
543 |
{ |
7985e7c10
|
544 |
unsigned long long tmp; |
512396000
|
545 |
int tmp0, tmp1; |
67eedba39
|
546 |
bool scale_db = false; |
1d892719e
|
547 |
|
3661f3f5e
|
548 |
switch (type) { |
67eedba39
|
549 |
case IIO_VAL_INT: |
512396000
|
550 |
return snprintf(buf, len, "%d", vals[0]); |
67eedba39
|
551 552 |
case IIO_VAL_INT_PLUS_MICRO_DB: scale_db = true; |
9d793c1a7
|
553 |
/* fall through */ |
67eedba39
|
554 |
case IIO_VAL_INT_PLUS_MICRO: |
9fbfb4b37
|
555 |
if (vals[1] < 0) |
512396000
|
556 557 |
return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]), -vals[1], scale_db ? " dB" : ""); |
1d892719e
|
558 |
else |
512396000
|
559 560 |
return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1], scale_db ? " dB" : ""); |
67eedba39
|
561 |
case IIO_VAL_INT_PLUS_NANO: |
9fbfb4b37
|
562 |
if (vals[1] < 0) |
512396000
|
563 564 |
return snprintf(buf, len, "-%d.%09u", abs(vals[0]), -vals[1]); |
71646e2c7
|
565 |
else |
512396000
|
566 |
return snprintf(buf, len, "%d.%09u", vals[0], vals[1]); |
7985e7c10
|
567 |
case IIO_VAL_FRACTIONAL: |
9fbfb4b37
|
568 |
tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
512396000
|
569 570 571 |
tmp1 = vals[1]; tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1); return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); |
103d9fb90
|
572 |
case IIO_VAL_FRACTIONAL_LOG2: |
7fd6592d1
|
573 574 575 |
tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]); tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1); return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); |
9fbfb4b37
|
576 577 578 |
case IIO_VAL_INT_MULTIPLE: { int i; |
512396000
|
579 |
int l = 0; |
9fbfb4b37
|
580 |
|
512396000
|
581 582 583 584 585 586 |
for (i = 0; i < size; ++i) { l += snprintf(&buf[l], len - l, "%d ", vals[i]); if (l >= len) break; } return l; |
9fbfb4b37
|
587 |
} |
67eedba39
|
588 |
default: |
1d892719e
|
589 |
return 0; |
67eedba39
|
590 |
} |
1d892719e
|
591 |
} |
512396000
|
592 593 594 595 596 |
/** * iio_format_value() - Formats a IIO value into its string representation * @buf: The buffer to which the formatted value gets written * which is assumed to be big enough (i.e. PAGE_SIZE). |
c175cb7cd
|
597 |
* @type: One of the IIO_VAL_* constants. This decides how the val |
512396000
|
598 599 600 601 602 603 604 |
* 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 |
c175cb7cd
|
605 |
* to the IIO_VAL_* constant. |
512396000
|
606 607 608 609 610 611 612 613 614 615 616 617 |
*/ ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) { ssize_t len; len = __iio_format_value(buf, PAGE_SIZE, type, size, vals); if (len >= PAGE_SIZE - 1) return -EFBIG; return len + sprintf(buf + len, " "); } |
7d2c2acac
|
618 |
EXPORT_SYMBOL_GPL(iio_format_value); |
1d892719e
|
619 |
|
3661f3f5e
|
620 621 622 623 624 625 |
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); |
9fbfb4b37
|
626 627 628 629 630 631 632 633 634 635 636 637 |
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); |
3661f3f5e
|
638 639 640 |
if (ret < 0) return ret; |
9fbfb4b37
|
641 |
return iio_format_value(buf, ret, val_len, vals); |
3661f3f5e
|
642 |
} |
512396000
|
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 |
static ssize_t iio_format_avail_list(char *buf, const int *vals, int type, int length) { int i; ssize_t len = 0; switch (type) { case IIO_VAL_INT: for (i = 0; i < length; i++) { len += __iio_format_value(buf + len, PAGE_SIZE - len, type, 1, &vals[i]); if (len >= PAGE_SIZE) return -EFBIG; if (i < length - 1) len += snprintf(buf + len, PAGE_SIZE - len, " "); else len += snprintf(buf + len, PAGE_SIZE - len, " "); if (len >= PAGE_SIZE) return -EFBIG; } break; default: for (i = 0; i < length / 2; i++) { len += __iio_format_value(buf + len, PAGE_SIZE - len, type, 2, &vals[i * 2]); if (len >= PAGE_SIZE) return -EFBIG; if (i < length / 2 - 1) len += snprintf(buf + len, PAGE_SIZE - len, " "); else len += snprintf(buf + len, PAGE_SIZE - len, " "); if (len >= PAGE_SIZE) return -EFBIG; } } return len; } static ssize_t iio_format_avail_range(char *buf, const int *vals, int type) { int i; ssize_t len; len = snprintf(buf, PAGE_SIZE, "["); switch (type) { case IIO_VAL_INT: for (i = 0; i < 3; i++) { len += __iio_format_value(buf + len, PAGE_SIZE - len, type, 1, &vals[i]); if (len >= PAGE_SIZE) return -EFBIG; if (i < 2) len += snprintf(buf + len, PAGE_SIZE - len, " "); else len += snprintf(buf + len, PAGE_SIZE - len, "] "); if (len >= PAGE_SIZE) return -EFBIG; } break; default: for (i = 0; i < 3; i++) { len += __iio_format_value(buf + len, PAGE_SIZE - len, type, 2, &vals[i * 2]); if (len >= PAGE_SIZE) return -EFBIG; if (i < 2) len += snprintf(buf + len, PAGE_SIZE - len, " "); else len += snprintf(buf + len, PAGE_SIZE - len, "] "); if (len >= PAGE_SIZE) return -EFBIG; } } return len; } static ssize_t iio_read_channel_info_avail(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 int *vals; int ret; int length; int type; ret = indio_dev->info->read_avail(indio_dev, this_attr->c, &vals, &type, &length, this_attr->address); if (ret < 0) return ret; switch (ret) { case IIO_AVAIL_LIST: return iio_format_avail_list(buf, vals, type, length); case IIO_AVAIL_RANGE: return iio_format_avail_range(buf, vals, type); default: return -EINVAL; } } |
6807d7211
|
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 |
/** * 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; |
f47dff323
|
774 775 776 777 778 |
if (fract_mult == 0) { *fract = 0; return kstrtoint(str, 0, integer); } |
6807d7211
|
779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 |
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 == ' ') { 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); |
1d892719e
|
821 822 823 824 825 |
static ssize_t iio_write_channel_info(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { |
e53f5ac52
|
826 |
struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719e
|
827 |
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d7211
|
828 829 |
int ret, fract_mult = 100000; int integer, fract; |
1d892719e
|
830 831 |
/* Assumes decimal - precision based on number of digits */ |
6fe8135fc
|
832 |
if (!indio_dev->info->write_raw) |
1d892719e
|
833 |
return -EINVAL; |
5c04af048
|
834 835 836 837 |
if (indio_dev->info->write_raw_get_fmt) switch (indio_dev->info->write_raw_get_fmt(indio_dev, this_attr->c, this_attr->address)) { |
f47dff323
|
838 839 840 |
case IIO_VAL_INT: fract_mult = 0; break; |
5c04af048
|
841 842 843 844 845 846 847 848 849 |
case IIO_VAL_INT_PLUS_MICRO: fract_mult = 100000; break; case IIO_VAL_INT_PLUS_NANO: fract_mult = 100000000; break; default: return -EINVAL; } |
6807d7211
|
850 851 852 |
ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); if (ret) return ret; |
1d892719e
|
853 |
|
6fe8135fc
|
854 |
ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af048
|
855 |
integer, fract, this_attr->address); |
1d892719e
|
856 857 858 859 860 |
if (ret) return ret; return len; } |
df9c1c42c
|
861 |
static |
1d892719e
|
862 863 864 865 866 867 868 869 870 871 |
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), |
3704432fb
|
872 |
enum iio_shared_by shared_by) |
1d892719e
|
873 |
{ |
3704432fb
|
874 |
int ret = 0; |
7bbcf7e13
|
875 |
char *name = NULL; |
3704432fb
|
876 |
char *full_postfix; |
1d892719e
|
877 |
sysfs_attr_init(&dev_attr->attr); |
1d892719e
|
878 |
|
ade7ef7ba
|
879 |
/* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432fb
|
880 |
if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7ba
|
881 882 883 884 885 886 887 888 889 890 891 892 |
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 { |
77bfa8baa
|
893 |
if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7ba
|
894 895 896 897 898 899 900 |
full_postfix = kstrdup(postfix, GFP_KERNEL); else full_postfix = kasprintf(GFP_KERNEL, "%s_%s", chan->extend_name, postfix); } |
3704432fb
|
901 902 |
if (full_postfix == NULL) return -ENOMEM; |
1d892719e
|
903 |
|
4abf6f8b2
|
904 |
if (chan->differential) { /* Differential can not have modifier */ |
3704432fb
|
905 |
switch (shared_by) { |
c006ec838
|
906 |
case IIO_SHARED_BY_ALL: |
7bbcf7e13
|
907 |
name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec838
|
908 909 |
break; case IIO_SHARED_BY_DIR: |
7bbcf7e13
|
910 |
name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec838
|
911 912 913 |
iio_direction[chan->output], full_postfix); break; |
3704432fb
|
914 |
case IIO_SHARED_BY_TYPE: |
7bbcf7e13
|
915 |
name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7ba
|
916 917 918 919 |
iio_direction[chan->output], iio_chan_type_name_spec[chan->type], iio_chan_type_name_spec[chan->type], full_postfix); |
3704432fb
|
920 921 922 |
break; case IIO_SEPARATE: if (!chan->indexed) { |
231bfe53c
|
923 924 |
WARN(1, "Differential channels must be indexed "); |
3704432fb
|
925 926 927 |
ret = -EINVAL; goto error_free_full_postfix; } |
7bbcf7e13
|
928 |
name = kasprintf(GFP_KERNEL, |
3704432fb
|
929 |
"%s_%s%d-%s%d_%s", |
ade7ef7ba
|
930 931 932 933 934 935 |
iio_direction[chan->output], iio_chan_type_name_spec[chan->type], chan->channel, iio_chan_type_name_spec[chan->type], chan->channel2, full_postfix); |
3704432fb
|
936 |
break; |
ade7ef7ba
|
937 938 |
} } else { /* Single ended */ |
3704432fb
|
939 |
switch (shared_by) { |
c006ec838
|
940 |
case IIO_SHARED_BY_ALL: |
7bbcf7e13
|
941 |
name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec838
|
942 943 |
break; case IIO_SHARED_BY_DIR: |
7bbcf7e13
|
944 |
name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec838
|
945 946 947 |
iio_direction[chan->output], full_postfix); break; |
3704432fb
|
948 |
case IIO_SHARED_BY_TYPE: |
7bbcf7e13
|
949 |
name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7ba
|
950 951 952 |
iio_direction[chan->output], iio_chan_type_name_spec[chan->type], full_postfix); |
3704432fb
|
953 954 955 956 |
break; case IIO_SEPARATE: if (chan->indexed) |
7bbcf7e13
|
957 |
name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432fb
|
958 959 960 961 962 |
iio_direction[chan->output], iio_chan_type_name_spec[chan->type], chan->channel, full_postfix); else |
7bbcf7e13
|
963 |
name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432fb
|
964 965 966 967 968 |
iio_direction[chan->output], iio_chan_type_name_spec[chan->type], full_postfix); break; } |
ade7ef7ba
|
969 |
} |
7bbcf7e13
|
970 |
if (name == NULL) { |
1d892719e
|
971 972 973 |
ret = -ENOMEM; goto error_free_full_postfix; } |
7bbcf7e13
|
974 |
dev_attr->attr.name = name; |
1d892719e
|
975 976 977 978 979 980 981 982 983 984 |
if (readfunc) { dev_attr->attr.mode |= S_IRUGO; dev_attr->show = readfunc; } if (writefunc) { dev_attr->attr.mode |= S_IWUSR; dev_attr->store = writefunc; } |
7bbcf7e13
|
985 |
|
1d892719e
|
986 987 |
error_free_full_postfix: kfree(full_postfix); |
3704432fb
|
988 |
|
1d892719e
|
989 990 |
return ret; } |
df9c1c42c
|
991 |
static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719e
|
992 993 994 995 996 |
{ kfree(dev_attr->attr.name); } int __iio_add_chan_devattr(const char *postfix, |
1d892719e
|
997 998 999 1000 1001 1002 1003 1004 |
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), |
e614a54b2
|
1005 |
u64 mask, |
3704432fb
|
1006 |
enum iio_shared_by shared_by, |
1d892719e
|
1007 1008 1009 1010 1011 |
struct device *dev, struct list_head *attr_list) { int ret; struct iio_dev_attr *iio_attr, *t; |
670c11033
|
1012 |
iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff97
|
1013 1014 |
if (iio_attr == NULL) return -ENOMEM; |
1d892719e
|
1015 1016 |
ret = __iio_device_attr_init(&iio_attr->dev_attr, postfix, chan, |
3704432fb
|
1017 |
readfunc, writefunc, shared_by); |
1d892719e
|
1018 1019 1020 1021 1022 1023 1024 |
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) { |
3704432fb
|
1025 |
if (shared_by == IIO_SEPARATE) |
1d892719e
|
1026 1027 1028 1029 1030 1031 |
dev_err(dev, "tried to double register : %s ", t->dev_attr.attr.name); ret = -EBUSY; goto error_device_attr_deinit; } |
1d892719e
|
1032 1033 1034 1035 1036 1037 1038 1039 |
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); |
1d892719e
|
1040 1041 |
return ret; } |
3704432fb
|
1042 1043 1044 1045 |
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) |
1d892719e
|
1046 |
{ |
3704432fb
|
1047 |
int i, ret, attrcount = 0; |
1d892719e
|
1048 |
|
1016d5676
|
1049 |
for_each_set_bit(i, infomask, sizeof(*infomask)*8) { |
ef4b48565
|
1050 1051 |
if (i >= ARRAY_SIZE(iio_chan_info_postfix)) return -EINVAL; |
8655cc490
|
1052 1053 1054 1055 1056 |
ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], chan, &iio_read_channel_info, &iio_write_channel_info, i, |
3704432fb
|
1057 |
shared_by, |
8655cc490
|
1058 1059 |
&indio_dev->dev, &indio_dev->channel_attr_list); |
3704432fb
|
1060 |
if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc490
|
1061 |
continue; |
3704432fb
|
1062 1063 |
else if (ret < 0) return ret; |
8655cc490
|
1064 1065 |
attrcount++; } |
5f420b420
|
1066 |
|
3704432fb
|
1067 1068 |
return attrcount; } |
512396000
|
1069 1070 1071 1072 1073 1074 1075 |
static int iio_device_add_info_mask_type_avail(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; char *avail_postfix; |
1016d5676
|
1076 |
for_each_set_bit(i, infomask, sizeof(*infomask) * 8) { |
936d3e536
|
1077 1078 |
if (i >= ARRAY_SIZE(iio_chan_info_postfix)) return -EINVAL; |
512396000
|
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 |
avail_postfix = kasprintf(GFP_KERNEL, "%s_available", iio_chan_info_postfix[i]); if (!avail_postfix) return -ENOMEM; ret = __iio_add_chan_devattr(avail_postfix, chan, &iio_read_channel_info_avail, NULL, i, shared_by, &indio_dev->dev, &indio_dev->channel_attr_list); kfree(avail_postfix); if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) continue; else if (ret < 0) return ret; attrcount++; } return attrcount; } |
3704432fb
|
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
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; |
512396000
|
1117 1118 1119 1120 1121 1122 1123 |
ret = iio_device_add_info_mask_type_avail(indio_dev, chan, IIO_SEPARATE, &chan-> info_mask_separate_available); if (ret < 0) return ret; attrcount += ret; |
3704432fb
|
1124 1125 1126 1127 1128 1129 |
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; |
512396000
|
1130 1131 1132 1133 1134 1135 1136 |
ret = iio_device_add_info_mask_type_avail(indio_dev, chan, IIO_SHARED_BY_TYPE, &chan-> info_mask_shared_by_type_available); if (ret < 0) return ret; attrcount += ret; |
c006ec838
|
1137 1138 1139 1140 1141 1142 |
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; |
512396000
|
1143 1144 1145 1146 1147 1148 |
ret = iio_device_add_info_mask_type_avail(indio_dev, chan, IIO_SHARED_BY_DIR, &chan->info_mask_shared_by_dir_available); if (ret < 0) return ret; attrcount += ret; |
c006ec838
|
1149 1150 1151 1152 1153 1154 |
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; |
512396000
|
1155 1156 1157 1158 1159 1160 |
ret = iio_device_add_info_mask_type_avail(indio_dev, chan, IIO_SHARED_BY_ALL, &chan->info_mask_shared_by_all_available); if (ret < 0) return ret; attrcount += ret; |
5f420b420
|
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 |
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) |
3704432fb
|
1179 |
return ret; |
5f420b420
|
1180 1181 1182 1183 |
attrcount++; } } |
3704432fb
|
1184 |
return attrcount; |
1d892719e
|
1185 |
} |
84088ebd1
|
1186 1187 1188 1189 1190 |
/** * 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 |
c1b03ab5e
|
1191 |
* attributes in the list. |
84088ebd1
|
1192 1193 |
*/ void iio_free_chan_devattr_list(struct list_head *attr_list) |
1d892719e
|
1194 |
{ |
84088ebd1
|
1195 1196 1197 1198 |
struct iio_dev_attr *p, *n; list_for_each_entry_safe(p, n, attr_list, l) { kfree(p->dev_attr.attr.name); |
c1b03ab5e
|
1199 |
list_del(&p->l); |
84088ebd1
|
1200 1201 |
kfree(p); } |
1d892719e
|
1202 |
} |
1b732888d
|
1203 1204 1205 1206 |
static ssize_t iio_show_dev_name(struct device *dev, struct device_attribute *attr, char *buf) { |
e53f5ac52
|
1207 |
struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db5816
|
1208 1209 |
return snprintf(buf, PAGE_SIZE, "%s ", indio_dev->name); |
1b732888d
|
1210 1211 1212 |
} static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); |
bc2b7dab6
|
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 |
static ssize_t iio_show_timestamp_clock(struct device *dev, struct device_attribute *attr, char *buf) { const struct iio_dev *indio_dev = dev_to_iio_dev(dev); const clockid_t clk = iio_device_get_clock(indio_dev); const char *name; ssize_t sz; switch (clk) { case CLOCK_REALTIME: name = "realtime "; sz = sizeof("realtime "); break; case CLOCK_MONOTONIC: name = "monotonic "; sz = sizeof("monotonic "); break; case CLOCK_MONOTONIC_RAW: name = "monotonic_raw "; sz = sizeof("monotonic_raw "); break; case CLOCK_REALTIME_COARSE: name = "realtime_coarse "; sz = sizeof("realtime_coarse "); break; case CLOCK_MONOTONIC_COARSE: name = "monotonic_coarse "; sz = sizeof("monotonic_coarse "); break; case CLOCK_BOOTTIME: name = "boottime "; sz = sizeof("boottime "); break; case CLOCK_TAI: name = "tai "; sz = sizeof("tai "); break; default: BUG(); } memcpy(buf, name, sz); return sz; } static ssize_t iio_store_timestamp_clock(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { clockid_t clk; int ret; if (sysfs_streq(buf, "realtime")) clk = CLOCK_REALTIME; else if (sysfs_streq(buf, "monotonic")) clk = CLOCK_MONOTONIC; else if (sysfs_streq(buf, "monotonic_raw")) clk = CLOCK_MONOTONIC_RAW; else if (sysfs_streq(buf, "realtime_coarse")) clk = CLOCK_REALTIME_COARSE; else if (sysfs_streq(buf, "monotonic_coarse")) clk = CLOCK_MONOTONIC_COARSE; else if (sysfs_streq(buf, "boottime")) clk = CLOCK_BOOTTIME; else if (sysfs_streq(buf, "tai")) clk = CLOCK_TAI; else return -EINVAL; ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); if (ret) return ret; return len; } static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, iio_show_timestamp_clock, iio_store_timestamp_clock); |
f8c6f4e9a
|
1306 |
static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719e
|
1307 |
{ |
26d25ae3f
|
1308 |
int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd1
|
1309 |
struct iio_dev_attr *p; |
bc2b7dab6
|
1310 |
struct attribute **attr, *clk = NULL; |
1d892719e
|
1311 |
|
26d25ae3f
|
1312 |
/* First count elements in any existing group */ |
f8c6f4e9a
|
1313 1314 |
if (indio_dev->info->attrs) { attr = indio_dev->info->attrs->attrs; |
26d25ae3f
|
1315 1316 |
while (*attr++ != NULL) attrcount_orig++; |
847ec80bb
|
1317 |
} |
26d25ae3f
|
1318 |
attrcount = attrcount_orig; |
1d892719e
|
1319 1320 |
/* * New channel registration method - relies on the fact a group does |
d25b3808d
|
1321 |
* not need to be initialized if its name is NULL. |
1d892719e
|
1322 |
*/ |
f8c6f4e9a
|
1323 1324 |
if (indio_dev->channels) for (i = 0; i < indio_dev->num_channels; i++) { |
bc2b7dab6
|
1325 1326 1327 1328 1329 1330 1331 |
const struct iio_chan_spec *chan = &indio_dev->channels[i]; if (chan->type == IIO_TIMESTAMP) clk = &dev_attr_current_timestamp_clock.attr; ret = iio_device_add_channel_sysfs(indio_dev, chan); |
1d892719e
|
1332 1333 |
if (ret < 0) goto error_clear_attrs; |
26d25ae3f
|
1334 |
attrcount += ret; |
1d892719e
|
1335 |
} |
26d25ae3f
|
1336 |
|
bc2b7dab6
|
1337 1338 |
if (indio_dev->event_interface) clk = &dev_attr_current_timestamp_clock.attr; |
f8c6f4e9a
|
1339 |
if (indio_dev->name) |
26d25ae3f
|
1340 |
attrcount++; |
bc2b7dab6
|
1341 1342 |
if (clk) attrcount++; |
26d25ae3f
|
1343 |
|
d83fb1849
|
1344 1345 1346 |
indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, sizeof(indio_dev->chan_attr_group.attrs[0]), GFP_KERNEL); |
f8c6f4e9a
|
1347 |
if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3f
|
1348 1349 |
ret = -ENOMEM; goto error_clear_attrs; |
1b732888d
|
1350 |
} |
26d25ae3f
|
1351 |
/* Copy across original attributes */ |
f8c6f4e9a
|
1352 1353 1354 1355 |
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]) |
26d25ae3f
|
1356 1357 1358 |
*attrcount_orig); attrn = attrcount_orig; /* Add all elements from the list. */ |
f8c6f4e9a
|
1359 1360 1361 1362 |
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; |
bc2b7dab6
|
1363 1364 |
if (clk) indio_dev->chan_attr_group.attrs[attrn++] = clk; |
26d25ae3f
|
1365 |
|
f8c6f4e9a
|
1366 1367 |
indio_dev->groups[indio_dev->groupcounter++] = &indio_dev->chan_attr_group; |
26d25ae3f
|
1368 |
|
1d892719e
|
1369 |
return 0; |
1b732888d
|
1370 |
|
1d892719e
|
1371 |
error_clear_attrs: |
84088ebd1
|
1372 |
iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719e
|
1373 |
|
26d25ae3f
|
1374 |
return ret; |
847ec80bb
|
1375 |
} |
f8c6f4e9a
|
1376 |
static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80bb
|
1377 |
{ |
1d892719e
|
1378 |
|
84088ebd1
|
1379 |
iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9a
|
1380 |
kfree(indio_dev->chan_attr_group.attrs); |
c1b03ab5e
|
1381 |
indio_dev->chan_attr_group.attrs = NULL; |
847ec80bb
|
1382 |
} |
847ec80bb
|
1383 1384 |
static void iio_dev_release(struct device *device) { |
e53f5ac52
|
1385 |
struct iio_dev *indio_dev = dev_to_iio_dev(device); |
d89e119a0
|
1386 |
if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
f8c6f4e9a
|
1387 1388 1389 |
iio_device_unregister_trigger_consumer(indio_dev); iio_device_unregister_eventset(indio_dev); iio_device_unregister_sysfs(indio_dev); |
e407fd655
|
1390 |
|
9e69c935f
|
1391 |
iio_buffer_put(indio_dev->buffer); |
e407fd655
|
1392 1393 |
ida_simple_remove(&iio_ida, indio_dev->id); kfree(indio_dev); |
847ec80bb
|
1394 |
} |
17d82b47a
|
1395 |
struct device_type iio_device_type = { |
847ec80bb
|
1396 1397 1398 |
.name = "iio_device", .release = iio_dev_release, }; |
a7e57dce0
|
1399 1400 1401 1402 |
/** * iio_device_alloc() - allocate an iio_dev from a driver * @sizeof_priv: Space to allocate for private structure. **/ |
7cbb75370
|
1403 |
struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80bb
|
1404 |
{ |
6f7c8ee58
|
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 |
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); |
847ec80bb
|
1417 1418 |
if (dev) { |
26d25ae3f
|
1419 |
dev->dev.groups = dev->groups; |
17d82b47a
|
1420 |
dev->dev.type = &iio_device_type; |
5aaaeba82
|
1421 |
dev->dev.bus = &iio_bus_type; |
847ec80bb
|
1422 1423 1424 |
device_initialize(&dev->dev); dev_set_drvdata(&dev->dev, (void *)dev); mutex_init(&dev->mlock); |
ac917a811
|
1425 |
mutex_init(&dev->info_exist_lock); |
e407fd655
|
1426 |
INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e8
|
1427 1428 1429 1430 |
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 */ |
3176dd5d3
|
1431 1432 |
pr_err("failed to get device id "); |
a9e39f9e8
|
1433 1434 1435 1436 |
kfree(dev); return NULL; } dev_set_name(&dev->dev, "iio:device%d", dev->id); |
84b36ce5f
|
1437 |
INIT_LIST_HEAD(&dev->buffer_list); |
847ec80bb
|
1438 1439 1440 1441 |
} return dev; } |
7cbb75370
|
1442 |
EXPORT_SYMBOL(iio_device_alloc); |
847ec80bb
|
1443 |
|
a7e57dce0
|
1444 1445 1446 1447 |
/** * iio_device_free() - free an iio_dev from a driver * @dev: the iio_dev associated with the device **/ |
7cbb75370
|
1448 |
void iio_device_free(struct iio_dev *dev) |
847ec80bb
|
1449 |
{ |
e407fd655
|
1450 1451 |
if (dev) put_device(&dev->dev); |
847ec80bb
|
1452 |
} |
7cbb75370
|
1453 |
EXPORT_SYMBOL(iio_device_free); |
847ec80bb
|
1454 |
|
9dabaf5ed
|
1455 1456 1457 1458 |
static void devm_iio_device_release(struct device *dev, void *res) { iio_device_free(*(struct iio_dev **)res); } |
70e483487
|
1459 |
int devm_iio_device_match(struct device *dev, void *res, void *data) |
9dabaf5ed
|
1460 1461 1462 1463 1464 1465 1466 1467 |
{ struct iio_dev **r = res; if (!r || !*r) { WARN_ON(!r || !*r); return 0; } return *r == data; } |
70e483487
|
1468 |
EXPORT_SYMBOL_GPL(devm_iio_device_match); |
9dabaf5ed
|
1469 |
|
a7e57dce0
|
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 |
/** * 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. */ |
9dabaf5ed
|
1484 1485 1486 1487 1488 1489 1490 1491 |
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; |
9dabaf5ed
|
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 |
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); |
a7e57dce0
|
1503 1504 1505 1506 1507 1508 1509 |
/** * 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(). */ |
9dabaf5ed
|
1510 1511 1512 1513 1514 1515 1516 1517 1518 |
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); |
1aa042783
|
1519 |
/** |
14555b144
|
1520 |
* iio_chrdev_open() - chrdev file open for buffer access and ioctls |
2498dcf6e
|
1521 1522 1523 1524 1525 |
* @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 |
1aa042783
|
1526 1527 1528 |
**/ static int iio_chrdev_open(struct inode *inode, struct file *filp) { |
f8c6f4e9a
|
1529 |
struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa042783
|
1530 |
struct iio_dev, chrdev); |
bb01443e2
|
1531 1532 1533 |
if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) return -EBUSY; |
cadc2125e
|
1534 |
iio_device_get(indio_dev); |
f8c6f4e9a
|
1535 |
filp->private_data = indio_dev; |
30eb82f05
|
1536 |
|
793351404
|
1537 |
return 0; |
1aa042783
|
1538 1539 1540 |
} /** |
14555b144
|
1541 |
* iio_chrdev_release() - chrdev file close buffer access and ioctls |
2498dcf6e
|
1542 1543 1544 1545 1546 |
* @inode: Inode structure pointer for the char device * @filp: File structure pointer for the char device * * Return: 0 for successful release */ |
1aa042783
|
1547 1548 |
static int iio_chrdev_release(struct inode *inode, struct file *filp) { |
bb01443e2
|
1549 1550 |
struct iio_dev *indio_dev = container_of(inode->i_cdev, struct iio_dev, chrdev); |
bb01443e2
|
1551 |
clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125e
|
1552 |
iio_device_put(indio_dev); |
1aa042783
|
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 |
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; |
f18e7a068
|
1563 1564 |
if (!indio_dev->info) return -ENODEV; |
1aa042783
|
1565 1566 |
if (cmd == IIO_GET_EVENT_FD_IOCTL) { fd = iio_event_getfd(indio_dev); |
3f9059b71
|
1567 1568 |
if (fd < 0) return fd; |
1aa042783
|
1569 1570 1571 1572 1573 1574 |
if (copy_to_user(ip, &fd, sizeof(fd))) return -EFAULT; return 0; } return -EINVAL; } |
14555b144
|
1575 1576 |
static const struct file_operations iio_buffer_fileops = { .read = iio_buffer_read_first_n_outer_addr, |
1aa042783
|
1577 1578 |
.release = iio_chrdev_release, .open = iio_chrdev_open, |
14555b144
|
1579 |
.poll = iio_buffer_poll_addr, |
1aa042783
|
1580 1581 1582 1583 1584 |
.owner = THIS_MODULE, .llseek = noop_llseek, .unlocked_ioctl = iio_ioctl, .compat_ioctl = iio_ioctl, }; |
8f5d8727a
|
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 |
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 ", channels[i].scan_index); return -EINVAL; } } return 0; } |
0f1acee5f
|
1608 |
static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
63b19547c
|
1609 |
int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) |
847ec80bb
|
1610 1611 |
{ int ret; |
63b19547c
|
1612 |
indio_dev->driver_module = this_mod; |
17d82b47a
|
1613 1614 1615 |
/* 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; |
8f5d8727a
|
1616 1617 1618 |
ret = iio_check_unique_scan_index(indio_dev); if (ret < 0) return ret; |
d45ebf1f9
|
1619 1620 |
if (!indio_dev->info) return -EINVAL; |
1aa042783
|
1621 |
/* configure elements for the chrdev */ |
f8c6f4e9a
|
1622 |
indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80bb
|
1623 |
|
8915aacac
|
1624 |
iio_device_register_debugfs(indio_dev); |
3e1b6c95b
|
1625 1626 1627 1628 1629 1630 1631 1632 |
ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); if (ret) { dev_err(indio_dev->dev.parent, "Failed to create buffer sysfs interfaces "); goto error_unreg_debugfs; } |
f8c6f4e9a
|
1633 |
ret = iio_device_register_sysfs(indio_dev); |
847ec80bb
|
1634 |
if (ret) { |
f8c6f4e9a
|
1635 |
dev_err(indio_dev->dev.parent, |
847ec80bb
|
1636 1637 |
"Failed to register sysfs interfaces "); |
3e1b6c95b
|
1638 |
goto error_buffer_free_sysfs; |
847ec80bb
|
1639 |
} |
f8c6f4e9a
|
1640 |
ret = iio_device_register_eventset(indio_dev); |
847ec80bb
|
1641 |
if (ret) { |
f8c6f4e9a
|
1642 |
dev_err(indio_dev->dev.parent, |
c849d2538
|
1643 1644 |
"Failed to register event set "); |
847ec80bb
|
1645 1646 |
goto error_free_sysfs; } |
d89e119a0
|
1647 |
if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
f8c6f4e9a
|
1648 |
iio_device_register_trigger_consumer(indio_dev); |
847ec80bb
|
1649 |
|
0f1acee5f
|
1650 1651 1652 |
if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && indio_dev->setup_ops == NULL) indio_dev->setup_ops = &noop_ring_setup_ops; |
f8c6f4e9a
|
1653 |
cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
63b19547c
|
1654 1655 |
indio_dev->chrdev.owner = this_mod; |
847ec80bb
|
1656 |
|
38923911d
|
1657 |
ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev); |
0d5b7dae8
|
1658 |
if (ret < 0) |
38923911d
|
1659 |
goto error_unreg_eventset; |
0d5b7dae8
|
1660 1661 |
return 0; |
38923911d
|
1662 |
|
26d25ae3f
|
1663 |
error_unreg_eventset: |
f8c6f4e9a
|
1664 |
iio_device_unregister_eventset(indio_dev); |
26d25ae3f
|
1665 |
error_free_sysfs: |
f8c6f4e9a
|
1666 |
iio_device_unregister_sysfs(indio_dev); |
3e1b6c95b
|
1667 1668 |
error_buffer_free_sysfs: iio_buffer_free_sysfs_and_mask(indio_dev); |
e553f182d
|
1669 1670 |
error_unreg_debugfs: iio_device_unregister_debugfs(indio_dev); |
847ec80bb
|
1671 1672 |
return ret; } |
63b19547c
|
1673 |
EXPORT_SYMBOL(__iio_device_register); |
847ec80bb
|
1674 |
|
a7e57dce0
|
1675 1676 1677 1678 |
/** * iio_device_unregister() - unregister a device from the IIO subsystem * @indio_dev: Device structure representing the device. **/ |
f8c6f4e9a
|
1679 |
void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80bb
|
1680 |
{ |
38923911d
|
1681 |
cdev_device_del(&indio_dev->chrdev, &indio_dev->dev); |
a87c82e45
|
1682 |
|
7f75591fc
|
1683 |
mutex_lock(&indio_dev->info_exist_lock); |
bc4c96129
|
1684 |
iio_device_unregister_debugfs(indio_dev); |
0d5b7dae8
|
1685 |
|
a87c82e45
|
1686 |
iio_disable_all_buffers(indio_dev); |
ac917a811
|
1687 |
indio_dev->info = NULL; |
d2f0a48f3
|
1688 1689 1690 |
iio_device_wakeup_eventset(indio_dev); iio_buffer_wakeup_poll(indio_dev); |
ac917a811
|
1691 |
mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95b
|
1692 1693 |
iio_buffer_free_sysfs_and_mask(indio_dev); |
847ec80bb
|
1694 1695 |
} EXPORT_SYMBOL(iio_device_unregister); |
8caa07c0e
|
1696 1697 1698 1699 1700 |
static void devm_iio_device_unreg(struct device *dev, void *res) { iio_device_unregister(*(struct iio_dev **)res); } |
63b19547c
|
1701 1702 |
int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, struct module *this_mod) |
8caa07c0e
|
1703 1704 1705 1706 1707 1708 1709 1710 1711 |
{ struct iio_dev **ptr; int ret; ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); if (!ptr) return -ENOMEM; *ptr = indio_dev; |
63b19547c
|
1712 |
ret = __iio_device_register(indio_dev, this_mod); |
8caa07c0e
|
1713 1714 1715 1716 1717 1718 1719 |
if (!ret) devres_add(dev, ptr); else devres_free(ptr); return ret; } |
63b19547c
|
1720 |
EXPORT_SYMBOL_GPL(__devm_iio_device_register); |
8caa07c0e
|
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 |
/** * 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); |
08a338055
|
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 |
/** * 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); |
847ec80bb
|
1775 1776 |
subsys_initcall(iio_init); module_exit(iio_exit); |
c8b95952e
|
1777 |
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80bb
|
1778 1779 |
MODULE_DESCRIPTION("Industrial I/O core"); MODULE_LICENSE("GPL"); |